1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2024, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "asm/assembler.hpp"
27 #include "asm/assembler.inline.hpp"
28 #include "ci/ciEnv.hpp"
29 #include "ci/ciInlineKlass.hpp"
30 #include "code/compiledIC.hpp"
31 #include "compiler/compileTask.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/barrierSet.hpp"
35 #include "gc/shared/barrierSetAssembler.hpp"
36 #include "gc/shared/cardTableBarrierSet.hpp"
37 #include "gc/shared/cardTable.hpp"
38 #include "gc/shared/collectedHeap.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "interpreter/bytecodeHistogram.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/interpreterRuntime.hpp"
43 #include "jvm.h"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "nativeInst_aarch64.hpp"
47 #include "oops/accessDecorators.hpp"
48 #include "oops/compressedKlass.inline.hpp"
49 #include "oops/compressedOops.inline.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/resolvedFieldEntry.hpp"
52 #include "runtime/continuation.hpp"
53 #include "runtime/globals.hpp"
54 #include "runtime/icache.hpp"
55 #include "runtime/interfaceSupport.inline.hpp"
56 #include "runtime/javaThread.hpp"
57 #include "runtime/jniHandles.inline.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/signature_cc.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "utilities/globalDefinitions.hpp"
62 #include "utilities/powerOfTwo.hpp"
63 #include "vmreg_aarch64.inline.hpp"
64 #ifdef COMPILER1
65 #include "c1/c1_LIRAssembler.hpp"
66 #endif
67 #ifdef COMPILER2
68 #include "oops/oop.hpp"
69 #include "opto/compile.hpp"
70 #include "opto/node.hpp"
71 #include "opto/output.hpp"
72 #endif
73
74 #include <sys/types.h>
75
76 #ifdef PRODUCT
77 #define BLOCK_COMMENT(str) /* nothing */
78 #else
79 #define BLOCK_COMMENT(str) block_comment(str)
80 #endif
81 #define STOP(str) stop(str);
82 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
83
84 #ifdef ASSERT
85 extern "C" void disnm(intptr_t p);
86 #endif
87 // Target-dependent relocation processing
88 //
89 // Instruction sequences whose target may need to be retrieved or
90 // patched are distinguished by their leading instruction, sorting
91 // them into three main instruction groups and related subgroups.
92 //
93 // 1) Branch, Exception and System (insn count = 1)
94 // 1a) Unconditional branch (immediate):
95 // b/bl imm19
96 // 1b) Compare & branch (immediate):
97 // cbz/cbnz Rt imm19
98 // 1c) Test & branch (immediate):
99 // tbz/tbnz Rt imm14
100 // 1d) Conditional branch (immediate):
101 // b.cond imm19
102 //
103 // 2) Loads and Stores (insn count = 1)
104 // 2a) Load register literal:
105 // ldr Rt imm19
106 //
107 // 3) Data Processing Immediate (insn count = 2 or 3)
108 // 3a) PC-rel. addressing
109 // adr/adrp Rx imm21; ldr/str Ry Rx #imm12
110 // adr/adrp Rx imm21; add Ry Rx #imm12
111 // adr/adrp Rx imm21; movk Rx #imm16<<32; ldr/str Ry, [Rx, #offset_in_page]
112 // adr/adrp Rx imm21
113 // adr/adrp Rx imm21; movk Rx #imm16<<32
114 // adr/adrp Rx imm21; movk Rx #imm16<<32; add Ry, Rx, #offset_in_page
115 // The latter form can only happen when the target is an
116 // ExternalAddress, and (by definition) ExternalAddresses don't
117 // move. Because of that property, there is never any need to
118 // patch the last of the three instructions. However,
119 // MacroAssembler::target_addr_for_insn takes all three
120 // instructions into account and returns the correct address.
121 // 3b) Move wide (immediate)
122 // movz Rx #imm16; movk Rx #imm16 << 16; movk Rx #imm16 << 32;
123 //
124 // A switch on a subset of the instruction's bits provides an
125 // efficient dispatch to these subcases.
126 //
127 // insn[28:26] -> main group ('x' == don't care)
128 // 00x -> UNALLOCATED
129 // 100 -> Data Processing Immediate
130 // 101 -> Branch, Exception and System
131 // x1x -> Loads and Stores
132 //
133 // insn[30:25] -> subgroup ('_' == group, 'x' == don't care).
134 // n.b. in some cases extra bits need to be checked to verify the
135 // instruction is as expected
136 //
137 // 1) ... xx101x Branch, Exception and System
138 // 1a) 00___x Unconditional branch (immediate)
139 // 1b) 01___0 Compare & branch (immediate)
140 // 1c) 01___1 Test & branch (immediate)
141 // 1d) 10___0 Conditional branch (immediate)
142 // other Should not happen
143 //
144 // 2) ... xxx1x0 Loads and Stores
145 // 2a) xx1__00 Load/Store register (insn[28] == 1 && insn[24] == 0)
146 // 2aa) x01__00 Load register literal (i.e. requires insn[29] == 0)
147 // strictly should be 64 bit non-FP/SIMD i.e.
148 // 0101_000 (i.e. requires insn[31:24] == 01011000)
149 //
150 // 3) ... xx100x Data Processing Immediate
151 // 3a) xx___00 PC-rel. addressing (n.b. requires insn[24] == 0)
152 // 3b) xx___101 Move wide (immediate) (n.b. requires insn[24:23] == 01)
153 // strictly should be 64 bit movz #imm16<<0
154 // 110___10100 (i.e. requires insn[31:21] == 11010010100)
155 //
156 class RelocActions {
157 protected:
158 typedef int (*reloc_insn)(address insn_addr, address &target);
159
160 virtual reloc_insn adrpMem() = 0;
161 virtual reloc_insn adrpAdd() = 0;
162 virtual reloc_insn adrpMovk() = 0;
163
164 const address _insn_addr;
165 const uint32_t _insn;
166
167 static uint32_t insn_at(address insn_addr, int n) {
168 return ((uint32_t*)insn_addr)[n];
169 }
170 uint32_t insn_at(int n) const {
171 return insn_at(_insn_addr, n);
172 }
173
174 public:
175
176 RelocActions(address insn_addr) : _insn_addr(insn_addr), _insn(insn_at(insn_addr, 0)) {}
177 RelocActions(address insn_addr, uint32_t insn)
178 : _insn_addr(insn_addr), _insn(insn) {}
179
180 virtual int unconditionalBranch(address insn_addr, address &target) = 0;
181 virtual int conditionalBranch(address insn_addr, address &target) = 0;
182 virtual int testAndBranch(address insn_addr, address &target) = 0;
183 virtual int loadStore(address insn_addr, address &target) = 0;
184 virtual int adr(address insn_addr, address &target) = 0;
185 virtual int adrp(address insn_addr, address &target, reloc_insn inner) = 0;
186 virtual int immediate(address insn_addr, address &target) = 0;
187 virtual void verify(address insn_addr, address &target) = 0;
188
189 int ALWAYSINLINE run(address insn_addr, address &target) {
190 int instructions = 1;
191
192 uint32_t dispatch = Instruction_aarch64::extract(_insn, 30, 25);
193 switch(dispatch) {
194 case 0b001010:
195 case 0b001011: {
196 instructions = unconditionalBranch(insn_addr, target);
197 break;
198 }
199 case 0b101010: // Conditional branch (immediate)
200 case 0b011010: { // Compare & branch (immediate)
201 instructions = conditionalBranch(insn_addr, target);
202 break;
203 }
204 case 0b011011: {
205 instructions = testAndBranch(insn_addr, target);
206 break;
207 }
208 case 0b001100:
209 case 0b001110:
210 case 0b011100:
211 case 0b011110:
212 case 0b101100:
213 case 0b101110:
214 case 0b111100:
215 case 0b111110: {
216 // load/store
217 if ((Instruction_aarch64::extract(_insn, 29, 24) & 0b111011) == 0b011000) {
218 // Load register (literal)
219 instructions = loadStore(insn_addr, target);
220 break;
221 } else {
222 // nothing to do
223 assert(target == nullptr, "did not expect to relocate target for polling page load");
224 }
225 break;
226 }
227 case 0b001000:
228 case 0b011000:
229 case 0b101000:
230 case 0b111000: {
231 // adr/adrp
232 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
233 int shift = Instruction_aarch64::extract(_insn, 31, 31);
234 if (shift) {
235 uint32_t insn2 = insn_at(1);
236 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 &&
237 Instruction_aarch64::extract(_insn, 4, 0) ==
238 Instruction_aarch64::extract(insn2, 9, 5)) {
239 instructions = adrp(insn_addr, target, adrpMem());
240 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 &&
241 Instruction_aarch64::extract(_insn, 4, 0) ==
242 Instruction_aarch64::extract(insn2, 4, 0)) {
243 instructions = adrp(insn_addr, target, adrpAdd());
244 } else if (Instruction_aarch64::extract(insn2, 31, 21) == 0b11110010110 &&
245 Instruction_aarch64::extract(_insn, 4, 0) ==
246 Instruction_aarch64::extract(insn2, 4, 0)) {
247 instructions = adrp(insn_addr, target, adrpMovk());
248 } else {
249 ShouldNotReachHere();
250 }
251 } else {
252 instructions = adr(insn_addr, target);
253 }
254 break;
255 }
256 case 0b001001:
257 case 0b011001:
258 case 0b101001:
259 case 0b111001: {
260 instructions = immediate(insn_addr, target);
261 break;
262 }
263 default: {
264 ShouldNotReachHere();
265 }
266 }
267
268 verify(insn_addr, target);
269 return instructions * NativeInstruction::instruction_size;
270 }
271 };
272
273 class Patcher : public RelocActions {
274 virtual reloc_insn adrpMem() { return &Patcher::adrpMem_impl; }
275 virtual reloc_insn adrpAdd() { return &Patcher::adrpAdd_impl; }
276 virtual reloc_insn adrpMovk() { return &Patcher::adrpMovk_impl; }
277
278 public:
279 Patcher(address insn_addr) : RelocActions(insn_addr) {}
280
281 virtual int unconditionalBranch(address insn_addr, address &target) {
282 intptr_t offset = (target - insn_addr) >> 2;
283 Instruction_aarch64::spatch(insn_addr, 25, 0, offset);
284 return 1;
285 }
286 virtual int conditionalBranch(address insn_addr, address &target) {
287 intptr_t offset = (target - insn_addr) >> 2;
288 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
289 return 1;
290 }
291 virtual int testAndBranch(address insn_addr, address &target) {
292 intptr_t offset = (target - insn_addr) >> 2;
293 Instruction_aarch64::spatch(insn_addr, 18, 5, offset);
294 return 1;
295 }
296 virtual int loadStore(address insn_addr, address &target) {
297 intptr_t offset = (target - insn_addr) >> 2;
298 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
299 return 1;
300 }
301 virtual int adr(address insn_addr, address &target) {
302 #ifdef ASSERT
303 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
304 #endif
305 // PC-rel. addressing
306 ptrdiff_t offset = target - insn_addr;
307 int offset_lo = offset & 3;
308 offset >>= 2;
309 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
310 Instruction_aarch64::patch(insn_addr, 30, 29, offset_lo);
311 return 1;
312 }
313 virtual int adrp(address insn_addr, address &target, reloc_insn inner) {
314 int instructions = 1;
315 #ifdef ASSERT
316 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
317 #endif
318 ptrdiff_t offset = target - insn_addr;
319 instructions = 2;
320 precond(inner != nullptr);
321 // Give the inner reloc a chance to modify the target.
322 address adjusted_target = target;
323 instructions = (*inner)(insn_addr, adjusted_target);
324 uintptr_t pc_page = (uintptr_t)insn_addr >> 12;
325 uintptr_t adr_page = (uintptr_t)adjusted_target >> 12;
326 offset = adr_page - pc_page;
327 int offset_lo = offset & 3;
328 offset >>= 2;
329 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
330 Instruction_aarch64::patch(insn_addr, 30, 29, offset_lo);
331 return instructions;
332 }
333 static int adrpMem_impl(address insn_addr, address &target) {
334 uintptr_t dest = (uintptr_t)target;
335 int offset_lo = dest & 0xfff;
336 uint32_t insn2 = insn_at(insn_addr, 1);
337 uint32_t size = Instruction_aarch64::extract(insn2, 31, 30);
338 Instruction_aarch64::patch(insn_addr + sizeof (uint32_t), 21, 10, offset_lo >> size);
339 guarantee(((dest >> size) << size) == dest, "misaligned target");
340 return 2;
341 }
342 static int adrpAdd_impl(address insn_addr, address &target) {
343 uintptr_t dest = (uintptr_t)target;
344 int offset_lo = dest & 0xfff;
345 Instruction_aarch64::patch(insn_addr + sizeof (uint32_t), 21, 10, offset_lo);
346 return 2;
347 }
348 static int adrpMovk_impl(address insn_addr, address &target) {
349 uintptr_t dest = uintptr_t(target);
350 Instruction_aarch64::patch(insn_addr + sizeof (uint32_t), 20, 5, (uintptr_t)target >> 32);
351 dest = (dest & 0xffffffffULL) | (uintptr_t(insn_addr) & 0xffff00000000ULL);
352 target = address(dest);
353 return 2;
354 }
355 virtual int immediate(address insn_addr, address &target) {
356 assert(Instruction_aarch64::extract(_insn, 31, 21) == 0b11010010100, "must be");
357 uint64_t dest = (uint64_t)target;
358 // Move wide constant
359 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
360 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch");
361 Instruction_aarch64::patch(insn_addr, 20, 5, dest & 0xffff);
362 Instruction_aarch64::patch(insn_addr+4, 20, 5, (dest >>= 16) & 0xffff);
363 Instruction_aarch64::patch(insn_addr+8, 20, 5, (dest >>= 16) & 0xffff);
364 return 3;
365 }
366 virtual void verify(address insn_addr, address &target) {
367 #ifdef ASSERT
368 address address_is = MacroAssembler::target_addr_for_insn(insn_addr);
369 if (!(address_is == target)) {
370 tty->print_cr("%p at %p should be %p", address_is, insn_addr, target);
371 disnm((intptr_t)insn_addr);
372 assert(address_is == target, "should be");
373 }
374 #endif
375 }
376 };
377
378 // If insn1 and insn2 use the same register to form an address, either
379 // by an offsetted LDR or a simple ADD, return the offset. If the
380 // second instruction is an LDR, the offset may be scaled.
381 static bool offset_for(uint32_t insn1, uint32_t insn2, ptrdiff_t &byte_offset) {
382 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 &&
383 Instruction_aarch64::extract(insn1, 4, 0) ==
384 Instruction_aarch64::extract(insn2, 9, 5)) {
385 // Load/store register (unsigned immediate)
386 byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
387 uint32_t size = Instruction_aarch64::extract(insn2, 31, 30);
388 byte_offset <<= size;
389 return true;
390 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 &&
391 Instruction_aarch64::extract(insn1, 4, 0) ==
392 Instruction_aarch64::extract(insn2, 4, 0)) {
393 // add (immediate)
394 byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
395 return true;
396 }
397 return false;
398 }
399
400 class AArch64Decoder : public RelocActions {
401 virtual reloc_insn adrpMem() { return &AArch64Decoder::adrpMem_impl; }
402 virtual reloc_insn adrpAdd() { return &AArch64Decoder::adrpAdd_impl; }
403 virtual reloc_insn adrpMovk() { return &AArch64Decoder::adrpMovk_impl; }
404
405 public:
406 AArch64Decoder(address insn_addr, uint32_t insn) : RelocActions(insn_addr, insn) {}
407
408 virtual int loadStore(address insn_addr, address &target) {
409 intptr_t offset = Instruction_aarch64::sextract(_insn, 23, 5);
410 target = insn_addr + (offset << 2);
411 return 1;
412 }
413 virtual int unconditionalBranch(address insn_addr, address &target) {
414 intptr_t offset = Instruction_aarch64::sextract(_insn, 25, 0);
415 target = insn_addr + (offset << 2);
416 return 1;
417 }
418 virtual int conditionalBranch(address insn_addr, address &target) {
419 intptr_t offset = Instruction_aarch64::sextract(_insn, 23, 5);
420 target = address(((uint64_t)insn_addr + (offset << 2)));
421 return 1;
422 }
423 virtual int testAndBranch(address insn_addr, address &target) {
424 intptr_t offset = Instruction_aarch64::sextract(_insn, 18, 5);
425 target = address(((uint64_t)insn_addr + (offset << 2)));
426 return 1;
427 }
428 virtual int adr(address insn_addr, address &target) {
429 // PC-rel. addressing
430 intptr_t offset = Instruction_aarch64::extract(_insn, 30, 29);
431 offset |= Instruction_aarch64::sextract(_insn, 23, 5) << 2;
432 target = address((uint64_t)insn_addr + offset);
433 return 1;
434 }
435 virtual int adrp(address insn_addr, address &target, reloc_insn inner) {
436 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
437 intptr_t offset = Instruction_aarch64::extract(_insn, 30, 29);
438 offset |= Instruction_aarch64::sextract(_insn, 23, 5) << 2;
439 int shift = 12;
440 offset <<= shift;
441 uint64_t target_page = ((uint64_t)insn_addr) + offset;
442 target_page &= ((uint64_t)-1) << shift;
443 uint32_t insn2 = insn_at(1);
444 target = address(target_page);
445 precond(inner != nullptr);
446 (*inner)(insn_addr, target);
447 return 2;
448 }
449 static int adrpMem_impl(address insn_addr, address &target) {
450 uint32_t insn2 = insn_at(insn_addr, 1);
451 // Load/store register (unsigned immediate)
452 ptrdiff_t byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
453 uint32_t size = Instruction_aarch64::extract(insn2, 31, 30);
454 byte_offset <<= size;
455 target += byte_offset;
456 return 2;
457 }
458 static int adrpAdd_impl(address insn_addr, address &target) {
459 uint32_t insn2 = insn_at(insn_addr, 1);
460 // add (immediate)
461 ptrdiff_t byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
462 target += byte_offset;
463 return 2;
464 }
465 static int adrpMovk_impl(address insn_addr, address &target) {
466 uint32_t insn2 = insn_at(insn_addr, 1);
467 uint64_t dest = uint64_t(target);
468 dest = (dest & 0xffff0000ffffffff) |
469 ((uint64_t)Instruction_aarch64::extract(insn2, 20, 5) << 32);
470 target = address(dest);
471
472 // We know the destination 4k page. Maybe we have a third
473 // instruction.
474 uint32_t insn = insn_at(insn_addr, 0);
475 uint32_t insn3 = insn_at(insn_addr, 2);
476 ptrdiff_t byte_offset;
477 if (offset_for(insn, insn3, byte_offset)) {
478 target += byte_offset;
479 return 3;
480 } else {
481 return 2;
482 }
483 }
484 virtual int immediate(address insn_addr, address &target) {
485 uint32_t *insns = (uint32_t *)insn_addr;
486 assert(Instruction_aarch64::extract(_insn, 31, 21) == 0b11010010100, "must be");
487 // Move wide constant: movz, movk, movk. See movptr().
488 assert(nativeInstruction_at(insns+1)->is_movk(), "wrong insns in patch");
489 assert(nativeInstruction_at(insns+2)->is_movk(), "wrong insns in patch");
490 target = address(uint64_t(Instruction_aarch64::extract(_insn, 20, 5))
491 + (uint64_t(Instruction_aarch64::extract(insns[1], 20, 5)) << 16)
492 + (uint64_t(Instruction_aarch64::extract(insns[2], 20, 5)) << 32));
493 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
494 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch");
495 return 3;
496 }
497 virtual void verify(address insn_addr, address &target) {
498 }
499 };
500
501 address MacroAssembler::target_addr_for_insn(address insn_addr, uint32_t insn) {
502 AArch64Decoder decoder(insn_addr, insn);
503 address target;
504 decoder.run(insn_addr, target);
505 return target;
506 }
507
508 // Patch any kind of instruction; there may be several instructions.
509 // Return the total length (in bytes) of the instructions.
510 int MacroAssembler::pd_patch_instruction_size(address insn_addr, address target) {
511 Patcher patcher(insn_addr);
512 return patcher.run(insn_addr, target);
513 }
514
515 int MacroAssembler::patch_oop(address insn_addr, address o) {
516 int instructions;
517 unsigned insn = *(unsigned*)insn_addr;
518 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
519
520 // OOPs are either narrow (32 bits) or wide (48 bits). We encode
521 // narrow OOPs by setting the upper 16 bits in the first
522 // instruction.
523 if (Instruction_aarch64::extract(insn, 31, 21) == 0b11010010101) {
524 // Move narrow OOP
525 uint32_t n = CompressedOops::narrow_oop_value(cast_to_oop(o));
526 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16);
527 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff);
528 instructions = 2;
529 } else {
530 // Move wide OOP
531 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch");
532 uintptr_t dest = (uintptr_t)o;
533 Instruction_aarch64::patch(insn_addr, 20, 5, dest & 0xffff);
534 Instruction_aarch64::patch(insn_addr+4, 20, 5, (dest >>= 16) & 0xffff);
535 Instruction_aarch64::patch(insn_addr+8, 20, 5, (dest >>= 16) & 0xffff);
536 instructions = 3;
537 }
538 return instructions * NativeInstruction::instruction_size;
539 }
540
541 int MacroAssembler::patch_narrow_klass(address insn_addr, narrowKlass n) {
542 // Metadata pointers are either narrow (32 bits) or wide (48 bits).
543 // We encode narrow ones by setting the upper 16 bits in the first
544 // instruction.
545 NativeInstruction *insn = nativeInstruction_at(insn_addr);
546 assert(Instruction_aarch64::extract(insn->encoding(), 31, 21) == 0b11010010101 &&
547 nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
548
549 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16);
550 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff);
551 return 2 * NativeInstruction::instruction_size;
552 }
553
554 address MacroAssembler::target_addr_for_insn_or_null(address insn_addr, unsigned insn) {
555 if (NativeInstruction::is_ldrw_to_zr(address(&insn))) {
556 return nullptr;
557 }
558 return MacroAssembler::target_addr_for_insn(insn_addr, insn);
559 }
560
561 void MacroAssembler::safepoint_poll(Label& slow_path, bool at_return, bool acquire, bool in_nmethod, Register tmp) {
562 if (acquire) {
563 lea(tmp, Address(rthread, JavaThread::polling_word_offset()));
564 ldar(tmp, tmp);
565 } else {
566 ldr(tmp, Address(rthread, JavaThread::polling_word_offset()));
567 }
568 if (at_return) {
569 // Note that when in_nmethod is set, the stack pointer is incremented before the poll. Therefore,
570 // we may safely use the sp instead to perform the stack watermark check.
571 cmp(in_nmethod ? sp : rfp, tmp);
572 br(Assembler::HI, slow_path);
573 } else {
574 tbnz(tmp, log2i_exact(SafepointMechanism::poll_bit()), slow_path);
575 }
576 }
577
578 void MacroAssembler::rt_call(address dest, Register tmp) {
579 CodeBlob *cb = CodeCache::find_blob(dest);
580 if (cb) {
581 far_call(RuntimeAddress(dest));
582 } else {
583 lea(tmp, RuntimeAddress(dest));
584 blr(tmp);
585 }
586 }
587
588 void MacroAssembler::push_cont_fastpath(Register java_thread) {
589 if (!Continuations::enabled()) return;
590 Label done;
591 ldr(rscratch1, Address(java_thread, JavaThread::cont_fastpath_offset()));
592 cmp(sp, rscratch1);
593 br(Assembler::LS, done);
594 mov(rscratch1, sp); // we can't use sp as the source in str
595 str(rscratch1, Address(java_thread, JavaThread::cont_fastpath_offset()));
596 bind(done);
597 }
598
599 void MacroAssembler::pop_cont_fastpath(Register java_thread) {
600 if (!Continuations::enabled()) return;
601 Label done;
602 ldr(rscratch1, Address(java_thread, JavaThread::cont_fastpath_offset()));
603 cmp(sp, rscratch1);
604 br(Assembler::LO, done);
605 str(zr, Address(java_thread, JavaThread::cont_fastpath_offset()));
606 bind(done);
607 }
608
609 void MacroAssembler::reset_last_Java_frame(bool clear_fp) {
610 // we must set sp to zero to clear frame
611 str(zr, Address(rthread, JavaThread::last_Java_sp_offset()));
612
613 // must clear fp, so that compiled frames are not confused; it is
614 // possible that we need it only for debugging
615 if (clear_fp) {
616 str(zr, Address(rthread, JavaThread::last_Java_fp_offset()));
617 }
618
619 // Always clear the pc because it could have been set by make_walkable()
620 str(zr, Address(rthread, JavaThread::last_Java_pc_offset()));
621 }
622
623 // Calls to C land
624 //
625 // When entering C land, the rfp, & resp of the last Java frame have to be recorded
626 // in the (thread-local) JavaThread object. When leaving C land, the last Java fp
627 // has to be reset to 0. This is required to allow proper stack traversal.
628 void MacroAssembler::set_last_Java_frame(Register last_java_sp,
629 Register last_java_fp,
630 Register last_java_pc,
631 Register scratch) {
632
633 if (last_java_pc->is_valid()) {
634 str(last_java_pc, Address(rthread,
635 JavaThread::frame_anchor_offset()
636 + JavaFrameAnchor::last_Java_pc_offset()));
637 }
638
639 // determine last_java_sp register
640 if (last_java_sp == sp) {
641 mov(scratch, sp);
642 last_java_sp = scratch;
643 } else if (!last_java_sp->is_valid()) {
644 last_java_sp = esp;
645 }
646
647 str(last_java_sp, Address(rthread, JavaThread::last_Java_sp_offset()));
648
649 // last_java_fp is optional
650 if (last_java_fp->is_valid()) {
651 str(last_java_fp, Address(rthread, JavaThread::last_Java_fp_offset()));
652 }
653 }
654
655 void MacroAssembler::set_last_Java_frame(Register last_java_sp,
656 Register last_java_fp,
657 address last_java_pc,
658 Register scratch) {
659 assert(last_java_pc != nullptr, "must provide a valid PC");
660
661 adr(scratch, last_java_pc);
662 str(scratch, Address(rthread,
663 JavaThread::frame_anchor_offset()
664 + JavaFrameAnchor::last_Java_pc_offset()));
665
666 set_last_Java_frame(last_java_sp, last_java_fp, noreg, scratch);
667 }
668
669 void MacroAssembler::set_last_Java_frame(Register last_java_sp,
670 Register last_java_fp,
671 Label &L,
672 Register scratch) {
673 if (L.is_bound()) {
674 set_last_Java_frame(last_java_sp, last_java_fp, target(L), scratch);
675 } else {
676 InstructionMark im(this);
677 L.add_patch_at(code(), locator());
678 set_last_Java_frame(last_java_sp, last_java_fp, pc() /* Patched later */, scratch);
679 }
680 }
681
682 static inline bool target_needs_far_branch(address addr) {
683 // codecache size <= 128M
684 if (!MacroAssembler::far_branches()) {
685 return false;
686 }
687 // codecache size > 240M
688 if (MacroAssembler::codestub_branch_needs_far_jump()) {
689 return true;
690 }
691 // codecache size: 128M..240M
692 return !CodeCache::is_non_nmethod(addr);
693 }
694
695 void MacroAssembler::far_call(Address entry, Register tmp) {
696 assert(ReservedCodeCacheSize < 4*G, "branch out of range");
697 assert(CodeCache::find_blob(entry.target()) != nullptr,
698 "destination of far call not found in code cache");
699 assert(entry.rspec().type() == relocInfo::external_word_type
700 || entry.rspec().type() == relocInfo::runtime_call_type
701 || entry.rspec().type() == relocInfo::none, "wrong entry relocInfo type");
702 if (target_needs_far_branch(entry.target())) {
703 uint64_t offset;
704 // We can use ADRP here because we know that the total size of
705 // the code cache cannot exceed 2Gb (ADRP limit is 4GB).
706 adrp(tmp, entry, offset);
707 add(tmp, tmp, offset);
708 blr(tmp);
709 } else {
710 bl(entry);
711 }
712 }
713
714 int MacroAssembler::far_jump(Address entry, Register tmp) {
715 assert(ReservedCodeCacheSize < 4*G, "branch out of range");
716 assert(CodeCache::find_blob(entry.target()) != nullptr,
717 "destination of far call not found in code cache");
718 assert(entry.rspec().type() == relocInfo::external_word_type
719 || entry.rspec().type() == relocInfo::runtime_call_type
720 || entry.rspec().type() == relocInfo::none, "wrong entry relocInfo type");
721 address start = pc();
722 if (target_needs_far_branch(entry.target())) {
723 uint64_t offset;
724 // We can use ADRP here because we know that the total size of
725 // the code cache cannot exceed 2Gb (ADRP limit is 4GB).
726 adrp(tmp, entry, offset);
727 add(tmp, tmp, offset);
728 br(tmp);
729 } else {
730 b(entry);
731 }
732 return pc() - start;
733 }
734
735 void MacroAssembler::reserved_stack_check() {
736 // testing if reserved zone needs to be enabled
737 Label no_reserved_zone_enabling;
738
739 ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
740 cmp(sp, rscratch1);
741 br(Assembler::LO, no_reserved_zone_enabling);
742
743 enter(); // LR and FP are live.
744 lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone)));
745 mov(c_rarg0, rthread);
746 blr(rscratch1);
747 leave();
748
749 // We have already removed our own frame.
750 // throw_delayed_StackOverflowError will think that it's been
751 // called by our caller.
752 lea(rscratch1, RuntimeAddress(SharedRuntime::throw_delayed_StackOverflowError_entry()));
753 br(rscratch1);
754 should_not_reach_here();
755
756 bind(no_reserved_zone_enabling);
757 }
758
759 static void pass_arg0(MacroAssembler* masm, Register arg) {
760 if (c_rarg0 != arg ) {
761 masm->mov(c_rarg0, arg);
762 }
763 }
764
765 static void pass_arg1(MacroAssembler* masm, Register arg) {
766 if (c_rarg1 != arg ) {
767 masm->mov(c_rarg1, arg);
768 }
769 }
770
771 static void pass_arg2(MacroAssembler* masm, Register arg) {
772 if (c_rarg2 != arg ) {
773 masm->mov(c_rarg2, arg);
774 }
775 }
776
777 static void pass_arg3(MacroAssembler* masm, Register arg) {
778 if (c_rarg3 != arg ) {
779 masm->mov(c_rarg3, arg);
780 }
781 }
782
783 static bool is_preemptable(address entry_point) {
784 return entry_point == CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter);
785 }
786
787 void MacroAssembler::call_VM_base(Register oop_result,
788 Register java_thread,
789 Register last_java_sp,
790 address entry_point,
791 int number_of_arguments,
792 bool check_exceptions) {
793 // determine java_thread register
794 if (!java_thread->is_valid()) {
795 java_thread = rthread;
796 }
797
798 // determine last_java_sp register
799 if (!last_java_sp->is_valid()) {
800 last_java_sp = esp;
801 }
802
803 // debugging support
804 assert(number_of_arguments >= 0 , "cannot have negative number of arguments");
805 assert(java_thread == rthread, "unexpected register");
806 #ifdef ASSERT
807 // TraceBytecodes does not use r12 but saves it over the call, so don't verify
808 // if ((UseCompressedOops || UseCompressedClassPointers) && !TraceBytecodes) verify_heapbase("call_VM_base: heap base corrupted?");
809 #endif // ASSERT
810
811 assert(java_thread != oop_result , "cannot use the same register for java_thread & oop_result");
812 assert(java_thread != last_java_sp, "cannot use the same register for java_thread & last_java_sp");
813
814 // push java thread (becomes first argument of C function)
815
816 mov(c_rarg0, java_thread);
817
818 // set last Java frame before call
819 assert(last_java_sp != rfp, "can't use rfp");
820
821 Label l;
822 if (is_preemptable(entry_point)) {
823 // skip setting last_pc since we already set it to desired value.
824 set_last_Java_frame(last_java_sp, rfp, noreg, rscratch1);
825 } else {
826 set_last_Java_frame(last_java_sp, rfp, l, rscratch1);
827 }
828
829 // do the call, remove parameters
830 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments, &l);
831
832 // lr could be poisoned with PAC signature during throw_pending_exception
833 // if it was tail-call optimized by compiler, since lr is not callee-saved
834 // reload it with proper value
835 adr(lr, l);
836
837 // reset last Java frame
838 // Only interpreter should have to clear fp
839 reset_last_Java_frame(true);
840
841 // C++ interp handles this in the interpreter
842 check_and_handle_popframe(java_thread);
843 check_and_handle_earlyret(java_thread);
844
845 if (check_exceptions) {
846 // check for pending exceptions (java_thread is set upon return)
847 ldr(rscratch1, Address(java_thread, in_bytes(Thread::pending_exception_offset())));
848 Label ok;
849 cbz(rscratch1, ok);
850 lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry()));
851 br(rscratch1);
852 bind(ok);
853 }
854
855 // get oop result if there is one and reset the value in the thread
856 if (oop_result->is_valid()) {
857 get_vm_result_oop(oop_result, java_thread);
858 }
859 }
860
861 void MacroAssembler::call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) {
862 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions);
863 }
864
865 // Check the entry target is always reachable from any branch.
866 static bool is_always_within_branch_range(Address entry) {
867 const address target = entry.target();
868
869 if (!CodeCache::contains(target)) {
870 // We always use trampolines for callees outside CodeCache.
871 assert(entry.rspec().type() == relocInfo::runtime_call_type, "non-runtime call of an external target");
872 return false;
873 }
874
875 if (!MacroAssembler::far_branches()) {
876 return true;
877 }
878
879 if (entry.rspec().type() == relocInfo::runtime_call_type) {
880 // Runtime calls are calls of a non-compiled method (stubs, adapters).
881 // Non-compiled methods stay forever in CodeCache.
882 // We check whether the longest possible branch is within the branch range.
883 assert(CodeCache::find_blob(target) != nullptr &&
884 !CodeCache::find_blob(target)->is_nmethod(),
885 "runtime call of compiled method");
886 const address right_longest_branch_start = CodeCache::high_bound() - NativeInstruction::instruction_size;
887 const address left_longest_branch_start = CodeCache::low_bound();
888 const bool is_reachable = Assembler::reachable_from_branch_at(left_longest_branch_start, target) &&
889 Assembler::reachable_from_branch_at(right_longest_branch_start, target);
890 return is_reachable;
891 }
892
893 return false;
894 }
895
896 // Maybe emit a call via a trampoline. If the code cache is small
897 // trampolines won't be emitted.
898 address MacroAssembler::trampoline_call(Address entry) {
899 assert(entry.rspec().type() == relocInfo::runtime_call_type
900 || entry.rspec().type() == relocInfo::opt_virtual_call_type
901 || entry.rspec().type() == relocInfo::static_call_type
902 || entry.rspec().type() == relocInfo::virtual_call_type, "wrong reloc type");
903
904 address target = entry.target();
905
906 if (!is_always_within_branch_range(entry)) {
907 if (!in_scratch_emit_size()) {
908 // We don't want to emit a trampoline if C2 is generating dummy
909 // code during its branch shortening phase.
910 if (entry.rspec().type() == relocInfo::runtime_call_type) {
911 assert(CodeBuffer::supports_shared_stubs(), "must support shared stubs");
912 code()->share_trampoline_for(entry.target(), offset());
913 } else {
914 address stub = emit_trampoline_stub(offset(), target);
915 if (stub == nullptr) {
916 postcond(pc() == badAddress);
917 return nullptr; // CodeCache is full
918 }
919 }
920 }
921 target = pc();
922 }
923
924 address call_pc = pc();
925 relocate(entry.rspec());
926 bl(target);
927
928 postcond(pc() != badAddress);
929 return call_pc;
930 }
931
932 // Emit a trampoline stub for a call to a target which is too far away.
933 //
934 // code sequences:
935 //
936 // call-site:
937 // branch-and-link to <destination> or <trampoline stub>
938 //
939 // Related trampoline stub for this call site in the stub section:
940 // load the call target from the constant pool
941 // branch (LR still points to the call site above)
942
943 address MacroAssembler::emit_trampoline_stub(int insts_call_instruction_offset,
944 address dest) {
945 // Max stub size: alignment nop, TrampolineStub.
946 address stub = start_a_stub(max_trampoline_stub_size());
947 if (stub == nullptr) {
948 return nullptr; // CodeBuffer::expand failed
949 }
950
951 // Create a trampoline stub relocation which relates this trampoline stub
952 // with the call instruction at insts_call_instruction_offset in the
953 // instructions code-section.
954 align(wordSize);
955 relocate(trampoline_stub_Relocation::spec(code()->insts()->start()
956 + insts_call_instruction_offset));
957 const int stub_start_offset = offset();
958
959 // Now, create the trampoline stub's code:
960 // - load the call
961 // - call
962 Label target;
963 ldr(rscratch1, target);
964 br(rscratch1);
965 bind(target);
966 assert(offset() - stub_start_offset == NativeCallTrampolineStub::data_offset,
967 "should be");
968 emit_int64((int64_t)dest);
969
970 const address stub_start_addr = addr_at(stub_start_offset);
971
972 assert(is_NativeCallTrampolineStub_at(stub_start_addr), "doesn't look like a trampoline");
973
974 end_a_stub();
975 return stub_start_addr;
976 }
977
978 int MacroAssembler::max_trampoline_stub_size() {
979 // Max stub size: alignment nop, TrampolineStub.
980 return NativeInstruction::instruction_size + NativeCallTrampolineStub::instruction_size;
981 }
982
983 void MacroAssembler::emit_static_call_stub() {
984 // CompiledDirectCall::set_to_interpreted knows the
985 // exact layout of this stub.
986
987 isb();
988 mov_metadata(rmethod, nullptr);
989
990 // Jump to the entry point of the c2i stub.
991 movptr(rscratch1, 0);
992 br(rscratch1);
993 }
994
995 int MacroAssembler::static_call_stub_size() {
996 // isb; movk; movz; movz; movk; movz; movz; br
997 return 8 * NativeInstruction::instruction_size;
998 }
999
1000 void MacroAssembler::c2bool(Register x) {
1001 // implements x == 0 ? 0 : 1
1002 // note: must only look at least-significant byte of x
1003 // since C-style booleans are stored in one byte
1004 // only! (was bug)
1005 tst(x, 0xff);
1006 cset(x, Assembler::NE);
1007 }
1008
1009 address MacroAssembler::ic_call(address entry, jint method_index) {
1010 RelocationHolder rh = virtual_call_Relocation::spec(pc(), method_index);
1011 // address const_ptr = long_constant((jlong)Universe::non_oop_word());
1012 // uintptr_t offset;
1013 // ldr_constant(rscratch2, const_ptr);
1014 movptr(rscratch2, (intptr_t)Universe::non_oop_word());
1015 return trampoline_call(Address(entry, rh));
1016 }
1017
1018 int MacroAssembler::ic_check_size() {
1019 int extra_instructions = UseCompactObjectHeaders ? 1 : 0;
1020 if (target_needs_far_branch(CAST_FROM_FN_PTR(address, SharedRuntime::get_ic_miss_stub()))) {
1021 return NativeInstruction::instruction_size * (7 + extra_instructions);
1022 } else {
1023 return NativeInstruction::instruction_size * (5 + extra_instructions);
1024 }
1025 }
1026
1027 int MacroAssembler::ic_check(int end_alignment) {
1028 Register receiver = j_rarg0;
1029 Register data = rscratch2;
1030 Register tmp1 = rscratch1;
1031 Register tmp2 = r10;
1032
1033 // The UEP of a code blob ensures that the VEP is padded. However, the padding of the UEP is placed
1034 // before the inline cache check, so we don't have to execute any nop instructions when dispatching
1035 // through the UEP, yet we can ensure that the VEP is aligned appropriately. That's why we align
1036 // before the inline cache check here, and not after
1037 align(end_alignment, offset() + ic_check_size());
1038
1039 int uep_offset = offset();
1040
1041 if (UseCompactObjectHeaders) {
1042 load_narrow_klass_compact(tmp1, receiver);
1043 ldrw(tmp2, Address(data, CompiledICData::speculated_klass_offset()));
1044 cmpw(tmp1, tmp2);
1045 } else if (UseCompressedClassPointers) {
1046 ldrw(tmp1, Address(receiver, oopDesc::klass_offset_in_bytes()));
1047 ldrw(tmp2, Address(data, CompiledICData::speculated_klass_offset()));
1048 cmpw(tmp1, tmp2);
1049 } else {
1050 ldr(tmp1, Address(receiver, oopDesc::klass_offset_in_bytes()));
1051 ldr(tmp2, Address(data, CompiledICData::speculated_klass_offset()));
1052 cmp(tmp1, tmp2);
1053 }
1054
1055 Label dont;
1056 br(Assembler::EQ, dont);
1057 far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
1058 bind(dont);
1059 assert((offset() % end_alignment) == 0, "Misaligned verified entry point");
1060
1061 return uep_offset;
1062 }
1063
1064 // Implementation of call_VM versions
1065
1066 void MacroAssembler::call_VM(Register oop_result,
1067 address entry_point,
1068 bool check_exceptions) {
1069 call_VM_helper(oop_result, entry_point, 0, check_exceptions);
1070 }
1071
1072 void MacroAssembler::call_VM(Register oop_result,
1073 address entry_point,
1074 Register arg_1,
1075 bool check_exceptions) {
1076 pass_arg1(this, arg_1);
1077 call_VM_helper(oop_result, entry_point, 1, check_exceptions);
1078 }
1079
1080 void MacroAssembler::call_VM(Register oop_result,
1081 address entry_point,
1082 Register arg_1,
1083 Register arg_2,
1084 bool check_exceptions) {
1085 assert_different_registers(arg_1, c_rarg2);
1086 pass_arg2(this, arg_2);
1087 pass_arg1(this, arg_1);
1088 call_VM_helper(oop_result, entry_point, 2, check_exceptions);
1089 }
1090
1091 void MacroAssembler::call_VM(Register oop_result,
1092 address entry_point,
1093 Register arg_1,
1094 Register arg_2,
1095 Register arg_3,
1096 bool check_exceptions) {
1097 assert_different_registers(arg_1, c_rarg2, c_rarg3);
1098 assert_different_registers(arg_2, c_rarg3);
1099 pass_arg3(this, arg_3);
1100
1101 pass_arg2(this, arg_2);
1102
1103 pass_arg1(this, arg_1);
1104 call_VM_helper(oop_result, entry_point, 3, check_exceptions);
1105 }
1106
1107 void MacroAssembler::call_VM(Register oop_result,
1108 Register last_java_sp,
1109 address entry_point,
1110 int number_of_arguments,
1111 bool check_exceptions) {
1112 call_VM_base(oop_result, rthread, last_java_sp, entry_point, number_of_arguments, check_exceptions);
1113 }
1114
1115 void MacroAssembler::call_VM(Register oop_result,
1116 Register last_java_sp,
1117 address entry_point,
1118 Register arg_1,
1119 bool check_exceptions) {
1120 pass_arg1(this, arg_1);
1121 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions);
1122 }
1123
1124 void MacroAssembler::call_VM(Register oop_result,
1125 Register last_java_sp,
1126 address entry_point,
1127 Register arg_1,
1128 Register arg_2,
1129 bool check_exceptions) {
1130
1131 assert_different_registers(arg_1, c_rarg2);
1132 pass_arg2(this, arg_2);
1133 pass_arg1(this, arg_1);
1134 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions);
1135 }
1136
1137 void MacroAssembler::call_VM(Register oop_result,
1138 Register last_java_sp,
1139 address entry_point,
1140 Register arg_1,
1141 Register arg_2,
1142 Register arg_3,
1143 bool check_exceptions) {
1144 assert_different_registers(arg_1, c_rarg2, c_rarg3);
1145 assert_different_registers(arg_2, c_rarg3);
1146 pass_arg3(this, arg_3);
1147 pass_arg2(this, arg_2);
1148 pass_arg1(this, arg_1);
1149 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions);
1150 }
1151
1152
1153 void MacroAssembler::get_vm_result_oop(Register oop_result, Register java_thread) {
1154 ldr(oop_result, Address(java_thread, JavaThread::vm_result_oop_offset()));
1155 str(zr, Address(java_thread, JavaThread::vm_result_oop_offset()));
1156 verify_oop_msg(oop_result, "broken oop in call_VM_base");
1157 }
1158
1159 void MacroAssembler::get_vm_result_metadata(Register metadata_result, Register java_thread) {
1160 ldr(metadata_result, Address(java_thread, JavaThread::vm_result_metadata_offset()));
1161 str(zr, Address(java_thread, JavaThread::vm_result_metadata_offset()));
1162 }
1163
1164 void MacroAssembler::align(int modulus) {
1165 align(modulus, offset());
1166 }
1167
1168 // Ensure that the code at target bytes offset from the current offset() is aligned
1169 // according to modulus.
1170 void MacroAssembler::align(int modulus, int target) {
1171 int delta = target - offset();
1172 while ((offset() + delta) % modulus != 0) nop();
1173 }
1174
1175 void MacroAssembler::post_call_nop() {
1176 if (!Continuations::enabled()) {
1177 return;
1178 }
1179 InstructionMark im(this);
1180 relocate(post_call_nop_Relocation::spec());
1181 InlineSkippedInstructionsCounter skipCounter(this);
1182 nop();
1183 movk(zr, 0);
1184 movk(zr, 0);
1185 }
1186
1187 // these are no-ops overridden by InterpreterMacroAssembler
1188
1189 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { }
1190
1191 void MacroAssembler::check_and_handle_popframe(Register java_thread) { }
1192
1193 // Look up the method for a megamorphic invokeinterface call.
1194 // The target method is determined by <intf_klass, itable_index>.
1195 // The receiver klass is in recv_klass.
1196 // On success, the result will be in method_result, and execution falls through.
1197 // On failure, execution transfers to the given label.
1198 void MacroAssembler::lookup_interface_method(Register recv_klass,
1199 Register intf_klass,
1200 RegisterOrConstant itable_index,
1201 Register method_result,
1202 Register scan_temp,
1203 Label& L_no_such_interface,
1204 bool return_method) {
1205 assert_different_registers(recv_klass, intf_klass, scan_temp);
1206 assert_different_registers(method_result, intf_klass, scan_temp);
1207 assert(recv_klass != method_result || !return_method,
1208 "recv_klass can be destroyed when method isn't needed");
1209 assert(itable_index.is_constant() || itable_index.as_register() == method_result,
1210 "caller must use same register for non-constant itable index as for method");
1211
1212 // Compute start of first itableOffsetEntry (which is at the end of the vtable)
1213 int vtable_base = in_bytes(Klass::vtable_start_offset());
1214 int itentry_off = in_bytes(itableMethodEntry::method_offset());
1215 int scan_step = itableOffsetEntry::size() * wordSize;
1216 int vte_size = vtableEntry::size_in_bytes();
1217 assert(vte_size == wordSize, "else adjust times_vte_scale");
1218
1219 ldrw(scan_temp, Address(recv_klass, Klass::vtable_length_offset()));
1220
1221 // Could store the aligned, prescaled offset in the klass.
1222 // lea(scan_temp, Address(recv_klass, scan_temp, times_vte_scale, vtable_base));
1223 lea(scan_temp, Address(recv_klass, scan_temp, Address::lsl(3)));
1224 add(scan_temp, scan_temp, vtable_base);
1225
1226 if (return_method) {
1227 // Adjust recv_klass by scaled itable_index, so we can free itable_index.
1228 assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
1229 // lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off));
1230 lea(recv_klass, Address(recv_klass, itable_index, Address::lsl(3)));
1231 if (itentry_off)
1232 add(recv_klass, recv_klass, itentry_off);
1233 }
1234
1235 // for (scan = klass->itable(); scan->interface() != nullptr; scan += scan_step) {
1236 // if (scan->interface() == intf) {
1237 // result = (klass + scan->offset() + itable_index);
1238 // }
1239 // }
1240 Label search, found_method;
1241
1242 ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset()));
1243 cmp(intf_klass, method_result);
1244 br(Assembler::EQ, found_method);
1245 bind(search);
1246 // Check that the previous entry is non-null. A null entry means that
1247 // the receiver class doesn't implement the interface, and wasn't the
1248 // same as when the caller was compiled.
1249 cbz(method_result, L_no_such_interface);
1250 if (itableOffsetEntry::interface_offset() != 0) {
1251 add(scan_temp, scan_temp, scan_step);
1252 ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset()));
1253 } else {
1254 ldr(method_result, Address(pre(scan_temp, scan_step)));
1255 }
1256 cmp(intf_klass, method_result);
1257 br(Assembler::NE, search);
1258
1259 bind(found_method);
1260
1261 // Got a hit.
1262 if (return_method) {
1263 ldrw(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset()));
1264 ldr(method_result, Address(recv_klass, scan_temp, Address::uxtw(0)));
1265 }
1266 }
1267
1268 // Look up the method for a megamorphic invokeinterface call in a single pass over itable:
1269 // - check recv_klass (actual object class) is a subtype of resolved_klass from CompiledICData
1270 // - find a holder_klass (class that implements the method) vtable offset and get the method from vtable by index
1271 // The target method is determined by <holder_klass, itable_index>.
1272 // The receiver klass is in recv_klass.
1273 // On success, the result will be in method_result, and execution falls through.
1274 // On failure, execution transfers to the given label.
1275 void MacroAssembler::lookup_interface_method_stub(Register recv_klass,
1276 Register holder_klass,
1277 Register resolved_klass,
1278 Register method_result,
1279 Register temp_itbl_klass,
1280 Register scan_temp,
1281 int itable_index,
1282 Label& L_no_such_interface) {
1283 // 'method_result' is only used as output register at the very end of this method.
1284 // Until then we can reuse it as 'holder_offset'.
1285 Register holder_offset = method_result;
1286 assert_different_registers(resolved_klass, recv_klass, holder_klass, temp_itbl_klass, scan_temp, holder_offset);
1287
1288 int vtable_start_offset = in_bytes(Klass::vtable_start_offset());
1289 int itable_offset_entry_size = itableOffsetEntry::size() * wordSize;
1290 int ioffset = in_bytes(itableOffsetEntry::interface_offset());
1291 int ooffset = in_bytes(itableOffsetEntry::offset_offset());
1292
1293 Label L_loop_search_resolved_entry, L_resolved_found, L_holder_found;
1294
1295 ldrw(scan_temp, Address(recv_klass, Klass::vtable_length_offset()));
1296 add(recv_klass, recv_klass, vtable_start_offset + ioffset);
1297 // itableOffsetEntry[] itable = recv_klass + Klass::vtable_start_offset() + sizeof(vtableEntry) * recv_klass->_vtable_len;
1298 // temp_itbl_klass = itable[0]._interface;
1299 int vtblEntrySize = vtableEntry::size_in_bytes();
1300 assert(vtblEntrySize == wordSize, "ldr lsl shift amount must be 3");
1301 ldr(temp_itbl_klass, Address(recv_klass, scan_temp, Address::lsl(exact_log2(vtblEntrySize))));
1302 mov(holder_offset, zr);
1303 // scan_temp = &(itable[0]._interface)
1304 lea(scan_temp, Address(recv_klass, scan_temp, Address::lsl(exact_log2(vtblEntrySize))));
1305
1306 // Initial checks:
1307 // - if (holder_klass != resolved_klass), go to "scan for resolved"
1308 // - if (itable[0] == holder_klass), shortcut to "holder found"
1309 // - if (itable[0] == 0), no such interface
1310 cmp(resolved_klass, holder_klass);
1311 br(Assembler::NE, L_loop_search_resolved_entry);
1312 cmp(holder_klass, temp_itbl_klass);
1313 br(Assembler::EQ, L_holder_found);
1314 cbz(temp_itbl_klass, L_no_such_interface);
1315
1316 // Loop: Look for holder_klass record in itable
1317 // do {
1318 // temp_itbl_klass = *(scan_temp += itable_offset_entry_size);
1319 // if (temp_itbl_klass == holder_klass) {
1320 // goto L_holder_found; // Found!
1321 // }
1322 // } while (temp_itbl_klass != 0);
1323 // goto L_no_such_interface // Not found.
1324 Label L_search_holder;
1325 bind(L_search_holder);
1326 ldr(temp_itbl_klass, Address(pre(scan_temp, itable_offset_entry_size)));
1327 cmp(holder_klass, temp_itbl_klass);
1328 br(Assembler::EQ, L_holder_found);
1329 cbnz(temp_itbl_klass, L_search_holder);
1330
1331 b(L_no_such_interface);
1332
1333 // Loop: Look for resolved_class record in itable
1334 // while (true) {
1335 // temp_itbl_klass = *(scan_temp += itable_offset_entry_size);
1336 // if (temp_itbl_klass == 0) {
1337 // goto L_no_such_interface;
1338 // }
1339 // if (temp_itbl_klass == resolved_klass) {
1340 // goto L_resolved_found; // Found!
1341 // }
1342 // if (temp_itbl_klass == holder_klass) {
1343 // holder_offset = scan_temp;
1344 // }
1345 // }
1346 //
1347 Label L_loop_search_resolved;
1348 bind(L_loop_search_resolved);
1349 ldr(temp_itbl_klass, Address(pre(scan_temp, itable_offset_entry_size)));
1350 bind(L_loop_search_resolved_entry);
1351 cbz(temp_itbl_klass, L_no_such_interface);
1352 cmp(resolved_klass, temp_itbl_klass);
1353 br(Assembler::EQ, L_resolved_found);
1354 cmp(holder_klass, temp_itbl_klass);
1355 br(Assembler::NE, L_loop_search_resolved);
1356 mov(holder_offset, scan_temp);
1357 b(L_loop_search_resolved);
1358
1359 // See if we already have a holder klass. If not, go and scan for it.
1360 bind(L_resolved_found);
1361 cbz(holder_offset, L_search_holder);
1362 mov(scan_temp, holder_offset);
1363
1364 // Finally, scan_temp contains holder_klass vtable offset
1365 bind(L_holder_found);
1366 ldrw(method_result, Address(scan_temp, ooffset - ioffset));
1367 add(recv_klass, recv_klass, itable_index * wordSize + in_bytes(itableMethodEntry::method_offset())
1368 - vtable_start_offset - ioffset); // substract offsets to restore the original value of recv_klass
1369 ldr(method_result, Address(recv_klass, method_result, Address::uxtw(0)));
1370 }
1371
1372 // virtual method calling
1373 void MacroAssembler::lookup_virtual_method(Register recv_klass,
1374 RegisterOrConstant vtable_index,
1375 Register method_result) {
1376 assert(vtableEntry::size() * wordSize == 8,
1377 "adjust the scaling in the code below");
1378 int64_t vtable_offset_in_bytes = in_bytes(Klass::vtable_start_offset() + vtableEntry::method_offset());
1379
1380 if (vtable_index.is_register()) {
1381 lea(method_result, Address(recv_klass,
1382 vtable_index.as_register(),
1383 Address::lsl(LogBytesPerWord)));
1384 ldr(method_result, Address(method_result, vtable_offset_in_bytes));
1385 } else {
1386 vtable_offset_in_bytes += vtable_index.as_constant() * wordSize;
1387 ldr(method_result,
1388 form_address(rscratch1, recv_klass, vtable_offset_in_bytes, 0));
1389 }
1390 }
1391
1392 void MacroAssembler::check_klass_subtype(Register sub_klass,
1393 Register super_klass,
1394 Register temp_reg,
1395 Label& L_success) {
1396 Label L_failure;
1397 check_klass_subtype_fast_path(sub_klass, super_klass, temp_reg, &L_success, &L_failure, nullptr);
1398 check_klass_subtype_slow_path(sub_klass, super_klass, temp_reg, noreg, &L_success, nullptr);
1399 bind(L_failure);
1400 }
1401
1402
1403 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
1404 Register super_klass,
1405 Register temp_reg,
1406 Label* L_success,
1407 Label* L_failure,
1408 Label* L_slow_path,
1409 Register super_check_offset) {
1410 assert_different_registers(sub_klass, super_klass, temp_reg, super_check_offset);
1411 bool must_load_sco = ! super_check_offset->is_valid();
1412 if (must_load_sco) {
1413 assert(temp_reg != noreg, "supply either a temp or a register offset");
1414 }
1415
1416 Label L_fallthrough;
1417 int label_nulls = 0;
1418 if (L_success == nullptr) { L_success = &L_fallthrough; label_nulls++; }
1419 if (L_failure == nullptr) { L_failure = &L_fallthrough; label_nulls++; }
1420 if (L_slow_path == nullptr) { L_slow_path = &L_fallthrough; label_nulls++; }
1421 assert(label_nulls <= 1, "at most one null in the batch");
1422
1423 int sco_offset = in_bytes(Klass::super_check_offset_offset());
1424 Address super_check_offset_addr(super_klass, sco_offset);
1425
1426 // Hacked jmp, which may only be used just before L_fallthrough.
1427 #define final_jmp(label) \
1428 if (&(label) == &L_fallthrough) { /*do nothing*/ } \
1429 else b(label) /*omit semi*/
1430
1431 // If the pointers are equal, we are done (e.g., String[] elements).
1432 // This self-check enables sharing of secondary supertype arrays among
1433 // non-primary types such as array-of-interface. Otherwise, each such
1434 // type would need its own customized SSA.
1435 // We move this check to the front of the fast path because many
1436 // type checks are in fact trivially successful in this manner,
1437 // so we get a nicely predicted branch right at the start of the check.
1438 cmp(sub_klass, super_klass);
1439 br(Assembler::EQ, *L_success);
1440
1441 // Check the supertype display:
1442 if (must_load_sco) {
1443 ldrw(temp_reg, super_check_offset_addr);
1444 super_check_offset = temp_reg;
1445 }
1446
1447 Address super_check_addr(sub_klass, super_check_offset);
1448 ldr(rscratch1, super_check_addr);
1449 cmp(super_klass, rscratch1); // load displayed supertype
1450 br(Assembler::EQ, *L_success);
1451
1452 // This check has worked decisively for primary supers.
1453 // Secondary supers are sought in the super_cache ('super_cache_addr').
1454 // (Secondary supers are interfaces and very deeply nested subtypes.)
1455 // This works in the same check above because of a tricky aliasing
1456 // between the super_cache and the primary super display elements.
1457 // (The 'super_check_addr' can address either, as the case requires.)
1458 // Note that the cache is updated below if it does not help us find
1459 // what we need immediately.
1460 // So if it was a primary super, we can just fail immediately.
1461 // Otherwise, it's the slow path for us (no success at this point).
1462
1463 sub(rscratch1, super_check_offset, in_bytes(Klass::secondary_super_cache_offset()));
1464 if (L_failure == &L_fallthrough) {
1465 cbz(rscratch1, *L_slow_path);
1466 } else {
1467 cbnz(rscratch1, *L_failure);
1468 final_jmp(*L_slow_path);
1469 }
1470
1471 bind(L_fallthrough);
1472
1473 #undef final_jmp
1474 }
1475
1476 // These two are taken from x86, but they look generally useful
1477
1478 // scans count pointer sized words at [addr] for occurrence of value,
1479 // generic
1480 void MacroAssembler::repne_scan(Register addr, Register value, Register count,
1481 Register scratch) {
1482 Label Lloop, Lexit;
1483 cbz(count, Lexit);
1484 bind(Lloop);
1485 ldr(scratch, post(addr, wordSize));
1486 cmp(value, scratch);
1487 br(EQ, Lexit);
1488 sub(count, count, 1);
1489 cbnz(count, Lloop);
1490 bind(Lexit);
1491 }
1492
1493 // scans count 4 byte words at [addr] for occurrence of value,
1494 // generic
1495 void MacroAssembler::repne_scanw(Register addr, Register value, Register count,
1496 Register scratch) {
1497 Label Lloop, Lexit;
1498 cbz(count, Lexit);
1499 bind(Lloop);
1500 ldrw(scratch, post(addr, wordSize));
1501 cmpw(value, scratch);
1502 br(EQ, Lexit);
1503 sub(count, count, 1);
1504 cbnz(count, Lloop);
1505 bind(Lexit);
1506 }
1507
1508 void MacroAssembler::check_klass_subtype_slow_path_linear(Register sub_klass,
1509 Register super_klass,
1510 Register temp_reg,
1511 Register temp2_reg,
1512 Label* L_success,
1513 Label* L_failure,
1514 bool set_cond_codes) {
1515 // NB! Callers may assume that, when temp2_reg is a valid register,
1516 // this code sets it to a nonzero value.
1517
1518 assert_different_registers(sub_klass, super_klass, temp_reg);
1519 if (temp2_reg != noreg)
1520 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg, rscratch1);
1521 #define IS_A_TEMP(reg) ((reg) == temp_reg || (reg) == temp2_reg)
1522
1523 Label L_fallthrough;
1524 int label_nulls = 0;
1525 if (L_success == nullptr) { L_success = &L_fallthrough; label_nulls++; }
1526 if (L_failure == nullptr) { L_failure = &L_fallthrough; label_nulls++; }
1527 assert(label_nulls <= 1, "at most one null in the batch");
1528
1529 // a couple of useful fields in sub_klass:
1530 int ss_offset = in_bytes(Klass::secondary_supers_offset());
1531 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
1532 Address secondary_supers_addr(sub_klass, ss_offset);
1533 Address super_cache_addr( sub_klass, sc_offset);
1534
1535 BLOCK_COMMENT("check_klass_subtype_slow_path");
1536
1537 // Do a linear scan of the secondary super-klass chain.
1538 // This code is rarely used, so simplicity is a virtue here.
1539 // The repne_scan instruction uses fixed registers, which we must spill.
1540 // Don't worry too much about pre-existing connections with the input regs.
1541
1542 assert(sub_klass != r0, "killed reg"); // killed by mov(r0, super)
1543 assert(sub_klass != r2, "killed reg"); // killed by lea(r2, &pst_counter)
1544
1545 RegSet pushed_registers;
1546 if (!IS_A_TEMP(r2)) pushed_registers += r2;
1547 if (!IS_A_TEMP(r5)) pushed_registers += r5;
1548
1549 if (super_klass != r0) {
1550 if (!IS_A_TEMP(r0)) pushed_registers += r0;
1551 }
1552
1553 push(pushed_registers, sp);
1554
1555 // Get super_klass value into r0 (even if it was in r5 or r2).
1556 if (super_klass != r0) {
1557 mov(r0, super_klass);
1558 }
1559
1560 #ifndef PRODUCT
1561 incrementw(ExternalAddress((address)&SharedRuntime::_partial_subtype_ctr));
1562 #endif //PRODUCT
1563
1564 // We will consult the secondary-super array.
1565 ldr(r5, secondary_supers_addr);
1566 // Load the array length.
1567 ldrw(r2, Address(r5, Array<Klass*>::length_offset_in_bytes()));
1568 // Skip to start of data.
1569 add(r5, r5, Array<Klass*>::base_offset_in_bytes());
1570
1571 cmp(sp, zr); // Clear Z flag; SP is never zero
1572 // Scan R2 words at [R5] for an occurrence of R0.
1573 // Set NZ/Z based on last compare.
1574 repne_scan(r5, r0, r2, rscratch1);
1575
1576 // Unspill the temp. registers:
1577 pop(pushed_registers, sp);
1578
1579 br(Assembler::NE, *L_failure);
1580
1581 // Success. Cache the super we found and proceed in triumph.
1582
1583 if (UseSecondarySupersCache) {
1584 str(super_klass, super_cache_addr);
1585 }
1586
1587 if (L_success != &L_fallthrough) {
1588 b(*L_success);
1589 }
1590
1591 #undef IS_A_TEMP
1592
1593 bind(L_fallthrough);
1594 }
1595
1596 // If Register r is invalid, remove a new register from
1597 // available_regs, and add new register to regs_to_push.
1598 Register MacroAssembler::allocate_if_noreg(Register r,
1599 RegSetIterator<Register> &available_regs,
1600 RegSet ®s_to_push) {
1601 if (!r->is_valid()) {
1602 r = *available_regs++;
1603 regs_to_push += r;
1604 }
1605 return r;
1606 }
1607
1608 // check_klass_subtype_slow_path_table() looks for super_klass in the
1609 // hash table belonging to super_klass, branching to L_success or
1610 // L_failure as appropriate. This is essentially a shim which
1611 // allocates registers as necessary then calls
1612 // lookup_secondary_supers_table() to do the work. Any of the temp
1613 // regs may be noreg, in which case this logic will chooses some
1614 // registers push and pop them from the stack.
1615 void MacroAssembler::check_klass_subtype_slow_path_table(Register sub_klass,
1616 Register super_klass,
1617 Register temp_reg,
1618 Register temp2_reg,
1619 Register temp3_reg,
1620 Register result_reg,
1621 FloatRegister vtemp,
1622 Label* L_success,
1623 Label* L_failure,
1624 bool set_cond_codes) {
1625 RegSet temps = RegSet::of(temp_reg, temp2_reg, temp3_reg);
1626
1627 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg, rscratch1);
1628
1629 Label L_fallthrough;
1630 int label_nulls = 0;
1631 if (L_success == nullptr) { L_success = &L_fallthrough; label_nulls++; }
1632 if (L_failure == nullptr) { L_failure = &L_fallthrough; label_nulls++; }
1633 assert(label_nulls <= 1, "at most one null in the batch");
1634
1635 BLOCK_COMMENT("check_klass_subtype_slow_path");
1636
1637 RegSetIterator<Register> available_regs
1638 = (RegSet::range(r0, r15) - temps - sub_klass - super_klass).begin();
1639
1640 RegSet pushed_regs;
1641
1642 temp_reg = allocate_if_noreg(temp_reg, available_regs, pushed_regs);
1643 temp2_reg = allocate_if_noreg(temp2_reg, available_regs, pushed_regs);
1644 temp3_reg = allocate_if_noreg(temp3_reg, available_regs, pushed_regs);
1645 result_reg = allocate_if_noreg(result_reg, available_regs, pushed_regs);
1646
1647 push(pushed_regs, sp);
1648
1649 lookup_secondary_supers_table_var(sub_klass,
1650 super_klass,
1651 temp_reg, temp2_reg, temp3_reg, vtemp, result_reg,
1652 nullptr);
1653 cmp(result_reg, zr);
1654
1655 // Unspill the temp. registers:
1656 pop(pushed_regs, sp);
1657
1658 // NB! Callers may assume that, when set_cond_codes is true, this
1659 // code sets temp2_reg to a nonzero value.
1660 if (set_cond_codes) {
1661 mov(temp2_reg, 1);
1662 }
1663
1664 br(Assembler::NE, *L_failure);
1665
1666 if (L_success != &L_fallthrough) {
1667 b(*L_success);
1668 }
1669
1670 bind(L_fallthrough);
1671 }
1672
1673 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
1674 Register super_klass,
1675 Register temp_reg,
1676 Register temp2_reg,
1677 Label* L_success,
1678 Label* L_failure,
1679 bool set_cond_codes) {
1680 if (UseSecondarySupersTable) {
1681 check_klass_subtype_slow_path_table
1682 (sub_klass, super_klass, temp_reg, temp2_reg, /*temp3*/noreg, /*result*/noreg,
1683 /*vtemp*/fnoreg,
1684 L_success, L_failure, set_cond_codes);
1685 } else {
1686 check_klass_subtype_slow_path_linear
1687 (sub_klass, super_klass, temp_reg, temp2_reg, L_success, L_failure, set_cond_codes);
1688 }
1689 }
1690
1691
1692 // Ensure that the inline code and the stub are using the same registers.
1693 #define LOOKUP_SECONDARY_SUPERS_TABLE_REGISTERS \
1694 do { \
1695 assert(r_super_klass == r0 && \
1696 r_array_base == r1 && \
1697 r_array_length == r2 && \
1698 (r_array_index == r3 || r_array_index == noreg) && \
1699 (r_sub_klass == r4 || r_sub_klass == noreg) && \
1700 (r_bitmap == rscratch2 || r_bitmap == noreg) && \
1701 (result == r5 || result == noreg), "registers must match aarch64.ad"); \
1702 } while(0)
1703
1704 bool MacroAssembler::lookup_secondary_supers_table_const(Register r_sub_klass,
1705 Register r_super_klass,
1706 Register temp1,
1707 Register temp2,
1708 Register temp3,
1709 FloatRegister vtemp,
1710 Register result,
1711 u1 super_klass_slot,
1712 bool stub_is_near) {
1713 assert_different_registers(r_sub_klass, temp1, temp2, temp3, result, rscratch1, rscratch2);
1714
1715 Label L_fallthrough;
1716
1717 BLOCK_COMMENT("lookup_secondary_supers_table {");
1718
1719 const Register
1720 r_array_base = temp1, // r1
1721 r_array_length = temp2, // r2
1722 r_array_index = temp3, // r3
1723 r_bitmap = rscratch2;
1724
1725 LOOKUP_SECONDARY_SUPERS_TABLE_REGISTERS;
1726
1727 u1 bit = super_klass_slot;
1728
1729 // Make sure that result is nonzero if the TBZ below misses.
1730 mov(result, 1);
1731
1732 // We're going to need the bitmap in a vector reg and in a core reg,
1733 // so load both now.
1734 ldr(r_bitmap, Address(r_sub_klass, Klass::secondary_supers_bitmap_offset()));
1735 if (bit != 0) {
1736 ldrd(vtemp, Address(r_sub_klass, Klass::secondary_supers_bitmap_offset()));
1737 }
1738 // First check the bitmap to see if super_klass might be present. If
1739 // the bit is zero, we are certain that super_klass is not one of
1740 // the secondary supers.
1741 tbz(r_bitmap, bit, L_fallthrough);
1742
1743 // Get the first array index that can contain super_klass into r_array_index.
1744 if (bit != 0) {
1745 shld(vtemp, vtemp, Klass::SECONDARY_SUPERS_TABLE_MASK - bit);
1746 cnt(vtemp, T8B, vtemp);
1747 addv(vtemp, T8B, vtemp);
1748 fmovd(r_array_index, vtemp);
1749 } else {
1750 mov(r_array_index, (u1)1);
1751 }
1752 // NB! r_array_index is off by 1. It is compensated by keeping r_array_base off by 1 word.
1753
1754 // We will consult the secondary-super array.
1755 ldr(r_array_base, Address(r_sub_klass, in_bytes(Klass::secondary_supers_offset())));
1756
1757 // The value i in r_array_index is >= 1, so even though r_array_base
1758 // points to the length, we don't need to adjust it to point to the
1759 // data.
1760 assert(Array<Klass*>::base_offset_in_bytes() == wordSize, "Adjust this code");
1761 assert(Array<Klass*>::length_offset_in_bytes() == 0, "Adjust this code");
1762
1763 ldr(result, Address(r_array_base, r_array_index, Address::lsl(LogBytesPerWord)));
1764 eor(result, result, r_super_klass);
1765 cbz(result, L_fallthrough); // Found a match
1766
1767 // Is there another entry to check? Consult the bitmap.
1768 tbz(r_bitmap, (bit + 1) & Klass::SECONDARY_SUPERS_TABLE_MASK, L_fallthrough);
1769
1770 // Linear probe.
1771 if (bit != 0) {
1772 ror(r_bitmap, r_bitmap, bit);
1773 }
1774
1775 // The slot we just inspected is at secondary_supers[r_array_index - 1].
1776 // The next slot to be inspected, by the stub we're about to call,
1777 // is secondary_supers[r_array_index]. Bits 0 and 1 in the bitmap
1778 // have been checked.
1779 Address stub = RuntimeAddress(StubRoutines::lookup_secondary_supers_table_slow_path_stub());
1780 if (stub_is_near) {
1781 bl(stub);
1782 } else {
1783 address call = trampoline_call(stub);
1784 if (call == nullptr) {
1785 return false; // trampoline allocation failed
1786 }
1787 }
1788
1789 BLOCK_COMMENT("} lookup_secondary_supers_table");
1790
1791 bind(L_fallthrough);
1792
1793 if (VerifySecondarySupers) {
1794 verify_secondary_supers_table(r_sub_klass, r_super_klass, // r4, r0
1795 temp1, temp2, result); // r1, r2, r5
1796 }
1797 return true;
1798 }
1799
1800 // At runtime, return 0 in result if r_super_klass is a superclass of
1801 // r_sub_klass, otherwise return nonzero. Use this version of
1802 // lookup_secondary_supers_table() if you don't know ahead of time
1803 // which superclass will be searched for. Used by interpreter and
1804 // runtime stubs. It is larger and has somewhat greater latency than
1805 // the version above, which takes a constant super_klass_slot.
1806 void MacroAssembler::lookup_secondary_supers_table_var(Register r_sub_klass,
1807 Register r_super_klass,
1808 Register temp1,
1809 Register temp2,
1810 Register temp3,
1811 FloatRegister vtemp,
1812 Register result,
1813 Label *L_success) {
1814 assert_different_registers(r_sub_klass, temp1, temp2, temp3, result, rscratch1, rscratch2);
1815
1816 Label L_fallthrough;
1817
1818 BLOCK_COMMENT("lookup_secondary_supers_table {");
1819
1820 const Register
1821 r_array_index = temp3,
1822 slot = rscratch1,
1823 r_bitmap = rscratch2;
1824
1825 ldrb(slot, Address(r_super_klass, Klass::hash_slot_offset()));
1826
1827 // Make sure that result is nonzero if the test below misses.
1828 mov(result, 1);
1829
1830 ldr(r_bitmap, Address(r_sub_klass, Klass::secondary_supers_bitmap_offset()));
1831
1832 // First check the bitmap to see if super_klass might be present. If
1833 // the bit is zero, we are certain that super_klass is not one of
1834 // the secondary supers.
1835
1836 // This next instruction is equivalent to:
1837 // mov(tmp_reg, (u1)(Klass::SECONDARY_SUPERS_TABLE_SIZE - 1));
1838 // sub(temp2, tmp_reg, slot);
1839 eor(temp2, slot, (u1)(Klass::SECONDARY_SUPERS_TABLE_SIZE - 1));
1840 lslv(temp2, r_bitmap, temp2);
1841 tbz(temp2, Klass::SECONDARY_SUPERS_TABLE_SIZE - 1, L_fallthrough);
1842
1843 bool must_save_v0 = (vtemp == fnoreg);
1844 if (must_save_v0) {
1845 // temp1 and result are free, so use them to preserve vtemp
1846 vtemp = v0;
1847 mov(temp1, vtemp, D, 0);
1848 mov(result, vtemp, D, 1);
1849 }
1850
1851 // Get the first array index that can contain super_klass into r_array_index.
1852 mov(vtemp, D, 0, temp2);
1853 cnt(vtemp, T8B, vtemp);
1854 addv(vtemp, T8B, vtemp);
1855 mov(r_array_index, vtemp, D, 0);
1856
1857 if (must_save_v0) {
1858 mov(vtemp, D, 0, temp1 );
1859 mov(vtemp, D, 1, result);
1860 }
1861
1862 // NB! r_array_index is off by 1. It is compensated by keeping r_array_base off by 1 word.
1863
1864 const Register
1865 r_array_base = temp1,
1866 r_array_length = temp2;
1867
1868 // The value i in r_array_index is >= 1, so even though r_array_base
1869 // points to the length, we don't need to adjust it to point to the
1870 // data.
1871 assert(Array<Klass*>::base_offset_in_bytes() == wordSize, "Adjust this code");
1872 assert(Array<Klass*>::length_offset_in_bytes() == 0, "Adjust this code");
1873
1874 // We will consult the secondary-super array.
1875 ldr(r_array_base, Address(r_sub_klass, in_bytes(Klass::secondary_supers_offset())));
1876
1877 ldr(result, Address(r_array_base, r_array_index, Address::lsl(LogBytesPerWord)));
1878 eor(result, result, r_super_klass);
1879 cbz(result, L_success ? *L_success : L_fallthrough); // Found a match
1880
1881 // Is there another entry to check? Consult the bitmap.
1882 rorv(r_bitmap, r_bitmap, slot);
1883 // rol(r_bitmap, r_bitmap, 1);
1884 tbz(r_bitmap, 1, L_fallthrough);
1885
1886 // The slot we just inspected is at secondary_supers[r_array_index - 1].
1887 // The next slot to be inspected, by the logic we're about to call,
1888 // is secondary_supers[r_array_index]. Bits 0 and 1 in the bitmap
1889 // have been checked.
1890 lookup_secondary_supers_table_slow_path(r_super_klass, r_array_base, r_array_index,
1891 r_bitmap, r_array_length, result, /*is_stub*/false);
1892
1893 BLOCK_COMMENT("} lookup_secondary_supers_table");
1894
1895 bind(L_fallthrough);
1896
1897 if (VerifySecondarySupers) {
1898 verify_secondary_supers_table(r_sub_klass, r_super_klass, // r4, r0
1899 temp1, temp2, result); // r1, r2, r5
1900 }
1901
1902 if (L_success) {
1903 cbz(result, *L_success);
1904 }
1905 }
1906
1907 // Called by code generated by check_klass_subtype_slow_path
1908 // above. This is called when there is a collision in the hashed
1909 // lookup in the secondary supers array.
1910 void MacroAssembler::lookup_secondary_supers_table_slow_path(Register r_super_klass,
1911 Register r_array_base,
1912 Register r_array_index,
1913 Register r_bitmap,
1914 Register temp1,
1915 Register result,
1916 bool is_stub) {
1917 assert_different_registers(r_super_klass, r_array_base, r_array_index, r_bitmap, temp1, result, rscratch1);
1918
1919 const Register
1920 r_array_length = temp1,
1921 r_sub_klass = noreg; // unused
1922
1923 if (is_stub) {
1924 LOOKUP_SECONDARY_SUPERS_TABLE_REGISTERS;
1925 }
1926
1927 Label L_fallthrough, L_huge;
1928
1929 // Load the array length.
1930 ldrw(r_array_length, Address(r_array_base, Array<Klass*>::length_offset_in_bytes()));
1931 // And adjust the array base to point to the data.
1932 // NB! Effectively increments current slot index by 1.
1933 assert(Array<Klass*>::base_offset_in_bytes() == wordSize, "");
1934 add(r_array_base, r_array_base, Array<Klass*>::base_offset_in_bytes());
1935
1936 // The bitmap is full to bursting.
1937 // Implicit invariant: BITMAP_FULL implies (length > 0)
1938 assert(Klass::SECONDARY_SUPERS_BITMAP_FULL == ~uintx(0), "");
1939 cmpw(r_array_length, (u1)(Klass::SECONDARY_SUPERS_TABLE_SIZE - 2));
1940 br(GT, L_huge);
1941
1942 // NB! Our caller has checked bits 0 and 1 in the bitmap. The
1943 // current slot (at secondary_supers[r_array_index]) has not yet
1944 // been inspected, and r_array_index may be out of bounds if we
1945 // wrapped around the end of the array.
1946
1947 { // This is conventional linear probing, but instead of terminating
1948 // when a null entry is found in the table, we maintain a bitmap
1949 // in which a 0 indicates missing entries.
1950 // As long as the bitmap is not completely full,
1951 // array_length == popcount(bitmap). The array_length check above
1952 // guarantees there are 0s in the bitmap, so the loop eventually
1953 // terminates.
1954 Label L_loop;
1955 bind(L_loop);
1956
1957 // Check for wraparound.
1958 cmp(r_array_index, r_array_length);
1959 csel(r_array_index, zr, r_array_index, GE);
1960
1961 ldr(rscratch1, Address(r_array_base, r_array_index, Address::lsl(LogBytesPerWord)));
1962 eor(result, rscratch1, r_super_klass);
1963 cbz(result, L_fallthrough);
1964
1965 tbz(r_bitmap, 2, L_fallthrough); // look-ahead check (Bit 2); result is non-zero
1966
1967 ror(r_bitmap, r_bitmap, 1);
1968 add(r_array_index, r_array_index, 1);
1969 b(L_loop);
1970 }
1971
1972 { // Degenerate case: more than 64 secondary supers.
1973 // FIXME: We could do something smarter here, maybe a vectorized
1974 // comparison or a binary search, but is that worth any added
1975 // complexity?
1976 bind(L_huge);
1977 cmp(sp, zr); // Clear Z flag; SP is never zero
1978 repne_scan(r_array_base, r_super_klass, r_array_length, rscratch1);
1979 cset(result, NE); // result == 0 iff we got a match.
1980 }
1981
1982 bind(L_fallthrough);
1983 }
1984
1985 // Make sure that the hashed lookup and a linear scan agree.
1986 void MacroAssembler::verify_secondary_supers_table(Register r_sub_klass,
1987 Register r_super_klass,
1988 Register temp1,
1989 Register temp2,
1990 Register result) {
1991 assert_different_registers(r_sub_klass, r_super_klass, temp1, temp2, result, rscratch1);
1992
1993 const Register
1994 r_array_base = temp1,
1995 r_array_length = temp2,
1996 r_array_index = noreg, // unused
1997 r_bitmap = noreg; // unused
1998
1999 BLOCK_COMMENT("verify_secondary_supers_table {");
2000
2001 // We will consult the secondary-super array.
2002 ldr(r_array_base, Address(r_sub_klass, in_bytes(Klass::secondary_supers_offset())));
2003
2004 // Load the array length.
2005 ldrw(r_array_length, Address(r_array_base, Array<Klass*>::length_offset_in_bytes()));
2006 // And adjust the array base to point to the data.
2007 add(r_array_base, r_array_base, Array<Klass*>::base_offset_in_bytes());
2008
2009 cmp(sp, zr); // Clear Z flag; SP is never zero
2010 // Scan R2 words at [R5] for an occurrence of R0.
2011 // Set NZ/Z based on last compare.
2012 repne_scan(/*addr*/r_array_base, /*value*/r_super_klass, /*count*/r_array_length, rscratch2);
2013 // rscratch1 == 0 iff we got a match.
2014 cset(rscratch1, NE);
2015
2016 Label passed;
2017 cmp(result, zr);
2018 cset(result, NE); // normalize result to 0/1 for comparison
2019
2020 cmp(rscratch1, result);
2021 br(EQ, passed);
2022 {
2023 mov(r0, r_super_klass); // r0 <- r0
2024 mov(r1, r_sub_klass); // r1 <- r4
2025 mov(r2, /*expected*/rscratch1); // r2 <- r8
2026 mov(r3, result); // r3 <- r5
2027 mov(r4, (address)("mismatch")); // r4 <- const
2028 rt_call(CAST_FROM_FN_PTR(address, Klass::on_secondary_supers_verification_failure), rscratch2);
2029 should_not_reach_here();
2030 }
2031 bind(passed);
2032
2033 BLOCK_COMMENT("} verify_secondary_supers_table");
2034 }
2035
2036 void MacroAssembler::clinit_barrier(Register klass, Register scratch, Label* L_fast_path, Label* L_slow_path) {
2037 assert(L_fast_path != nullptr || L_slow_path != nullptr, "at least one is required");
2038 assert_different_registers(klass, rthread, scratch);
2039
2040 Label L_fallthrough, L_tmp;
2041 if (L_fast_path == nullptr) {
2042 L_fast_path = &L_fallthrough;
2043 } else if (L_slow_path == nullptr) {
2044 L_slow_path = &L_fallthrough;
2045 }
2046 // Fast path check: class is fully initialized
2047 lea(scratch, Address(klass, InstanceKlass::init_state_offset()));
2048 ldarb(scratch, scratch);
2049 cmp(scratch, InstanceKlass::fully_initialized);
2050 br(Assembler::EQ, *L_fast_path);
2051
2052 // Fast path check: current thread is initializer thread
2053 ldr(scratch, Address(klass, InstanceKlass::init_thread_offset()));
2054 cmp(rthread, scratch);
2055
2056 if (L_slow_path == &L_fallthrough) {
2057 br(Assembler::EQ, *L_fast_path);
2058 bind(*L_slow_path);
2059 } else if (L_fast_path == &L_fallthrough) {
2060 br(Assembler::NE, *L_slow_path);
2061 bind(*L_fast_path);
2062 } else {
2063 Unimplemented();
2064 }
2065 }
2066
2067 void MacroAssembler::_verify_oop(Register reg, const char* s, const char* file, int line) {
2068 if (!VerifyOops || VerifyAdapterSharing) {
2069 // Below address of the code string confuses VerifyAdapterSharing
2070 // because it may differ between otherwise equivalent adapters.
2071 return;
2072 }
2073
2074 // Pass register number to verify_oop_subroutine
2075 const char* b = nullptr;
2076 {
2077 ResourceMark rm;
2078 stringStream ss;
2079 ss.print("verify_oop: %s: %s (%s:%d)", reg->name(), s, file, line);
2080 b = code_string(ss.as_string());
2081 }
2082 BLOCK_COMMENT("verify_oop {");
2083
2084 strip_return_address(); // This might happen within a stack frame.
2085 protect_return_address();
2086 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
2087 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
2088
2089 mov(r0, reg);
2090 movptr(rscratch1, (uintptr_t)(address)b);
2091
2092 // call indirectly to solve generation ordering problem
2093 lea(rscratch2, RuntimeAddress(StubRoutines::verify_oop_subroutine_entry_address()));
2094 ldr(rscratch2, Address(rscratch2));
2095 blr(rscratch2);
2096
2097 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize)));
2098 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize)));
2099 authenticate_return_address();
2100
2101 BLOCK_COMMENT("} verify_oop");
2102 }
2103
2104 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
2105 if (!VerifyOops || VerifyAdapterSharing) {
2106 // Below address of the code string confuses VerifyAdapterSharing
2107 // because it may differ between otherwise equivalent adapters.
2108 return;
2109 }
2110
2111 const char* b = nullptr;
2112 {
2113 ResourceMark rm;
2114 stringStream ss;
2115 ss.print("verify_oop_addr: %s (%s:%d)", s, file, line);
2116 b = code_string(ss.as_string());
2117 }
2118 BLOCK_COMMENT("verify_oop_addr {");
2119
2120 strip_return_address(); // This might happen within a stack frame.
2121 protect_return_address();
2122 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
2123 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
2124
2125 // addr may contain sp so we will have to adjust it based on the
2126 // pushes that we just did.
2127 if (addr.uses(sp)) {
2128 lea(r0, addr);
2129 ldr(r0, Address(r0, 4 * wordSize));
2130 } else {
2131 ldr(r0, addr);
2132 }
2133 movptr(rscratch1, (uintptr_t)(address)b);
2134
2135 // call indirectly to solve generation ordering problem
2136 lea(rscratch2, RuntimeAddress(StubRoutines::verify_oop_subroutine_entry_address()));
2137 ldr(rscratch2, Address(rscratch2));
2138 blr(rscratch2);
2139
2140 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize)));
2141 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize)));
2142 authenticate_return_address();
2143
2144 BLOCK_COMMENT("} verify_oop_addr");
2145 }
2146
2147 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
2148 int extra_slot_offset) {
2149 // cf. TemplateTable::prepare_invoke(), if (load_receiver).
2150 int stackElementSize = Interpreter::stackElementSize;
2151 int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0);
2152 #ifdef ASSERT
2153 int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1);
2154 assert(offset1 - offset == stackElementSize, "correct arithmetic");
2155 #endif
2156 if (arg_slot.is_constant()) {
2157 return Address(esp, arg_slot.as_constant() * stackElementSize
2158 + offset);
2159 } else {
2160 add(rscratch1, esp, arg_slot.as_register(),
2161 ext::uxtx, exact_log2(stackElementSize));
2162 return Address(rscratch1, offset);
2163 }
2164 }
2165
2166 void MacroAssembler::call_VM_leaf_base(address entry_point,
2167 int number_of_arguments,
2168 Label *retaddr) {
2169 Label E, L;
2170
2171 stp(rscratch1, rmethod, Address(pre(sp, -2 * wordSize)));
2172
2173 mov(rscratch1, entry_point);
2174 blr(rscratch1);
2175 if (retaddr)
2176 bind(*retaddr);
2177
2178 ldp(rscratch1, rmethod, Address(post(sp, 2 * wordSize)));
2179 }
2180
2181 void MacroAssembler::call_VM_leaf(address entry_point, int number_of_arguments) {
2182 call_VM_leaf_base(entry_point, number_of_arguments);
2183 }
2184
2185 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0) {
2186 pass_arg0(this, arg_0);
2187 call_VM_leaf_base(entry_point, 1);
2188 }
2189
2190 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
2191 assert_different_registers(arg_1, c_rarg0);
2192 pass_arg0(this, arg_0);
2193 pass_arg1(this, arg_1);
2194 call_VM_leaf_base(entry_point, 2);
2195 }
2196
2197 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0,
2198 Register arg_1, Register arg_2) {
2199 assert_different_registers(arg_1, c_rarg0);
2200 assert_different_registers(arg_2, c_rarg0, c_rarg1);
2201 pass_arg0(this, arg_0);
2202 pass_arg1(this, arg_1);
2203 pass_arg2(this, arg_2);
2204 call_VM_leaf_base(entry_point, 3);
2205 }
2206
2207 void MacroAssembler::super_call_VM_leaf(address entry_point) {
2208 MacroAssembler::call_VM_leaf_base(entry_point, 1);
2209 }
2210
2211 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) {
2212 pass_arg0(this, arg_0);
2213 MacroAssembler::call_VM_leaf_base(entry_point, 1);
2214 }
2215
2216 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
2217
2218 assert_different_registers(arg_0, c_rarg1);
2219 pass_arg1(this, arg_1);
2220 pass_arg0(this, arg_0);
2221 MacroAssembler::call_VM_leaf_base(entry_point, 2);
2222 }
2223
2224 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
2225 assert_different_registers(arg_0, c_rarg1, c_rarg2);
2226 assert_different_registers(arg_1, c_rarg2);
2227 pass_arg2(this, arg_2);
2228 pass_arg1(this, arg_1);
2229 pass_arg0(this, arg_0);
2230 MacroAssembler::call_VM_leaf_base(entry_point, 3);
2231 }
2232
2233 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) {
2234 assert_different_registers(arg_0, c_rarg1, c_rarg2, c_rarg3);
2235 assert_different_registers(arg_1, c_rarg2, c_rarg3);
2236 assert_different_registers(arg_2, c_rarg3);
2237 pass_arg3(this, arg_3);
2238 pass_arg2(this, arg_2);
2239 pass_arg1(this, arg_1);
2240 pass_arg0(this, arg_0);
2241 MacroAssembler::call_VM_leaf_base(entry_point, 4);
2242 }
2243
2244 void MacroAssembler::null_check(Register reg, int offset) {
2245 if (needs_explicit_null_check(offset)) {
2246 // provoke OS null exception if reg is null by
2247 // accessing M[reg] w/o changing any registers
2248 // NOTE: this is plenty to provoke a segv
2249 ldr(zr, Address(reg));
2250 } else {
2251 // nothing to do, (later) access of M[reg + offset]
2252 // will provoke OS null exception if reg is null
2253 }
2254 }
2255
2256 void MacroAssembler::test_markword_is_inline_type(Register markword, Label& is_inline_type) {
2257 assert_different_registers(markword, rscratch2);
2258 mov(rscratch2, markWord::inline_type_mask_in_place);
2259 andr(markword, markword, rscratch2);
2260 mov(rscratch2, markWord::inline_type_pattern);
2261 cmp(markword, rscratch2);
2262 br(Assembler::EQ, is_inline_type);
2263 }
2264
2265 void MacroAssembler::test_klass_is_inline_type(Register klass, Register temp_reg, Label& is_inline_type) {
2266 ldrh(temp_reg, Address(klass, Klass::access_flags_offset()));
2267 andr(temp_reg, temp_reg, JVM_ACC_IDENTITY);
2268 cbz(temp_reg, is_inline_type);
2269 }
2270
2271 void MacroAssembler::test_oop_is_not_inline_type(Register object, Register tmp, Label& not_inline_type) {
2272 assert_different_registers(tmp, rscratch1);
2273 cbz(object, not_inline_type);
2274 const int is_inline_type_mask = markWord::inline_type_pattern;
2275 ldr(tmp, Address(object, oopDesc::mark_offset_in_bytes()));
2276 mov(rscratch1, is_inline_type_mask);
2277 andr(tmp, tmp, rscratch1);
2278 cmp(tmp, rscratch1);
2279 br(Assembler::NE, not_inline_type);
2280 }
2281
2282 void MacroAssembler::test_field_is_null_free_inline_type(Register flags, Register temp_reg, Label& is_null_free_inline_type) {
2283 assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2284 tbnz(flags, ResolvedFieldEntry::is_null_free_inline_type_shift, is_null_free_inline_type);
2285 }
2286
2287 void MacroAssembler::test_field_is_not_null_free_inline_type(Register flags, Register temp_reg, Label& not_null_free_inline_type) {
2288 assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2289 tbz(flags, ResolvedFieldEntry::is_null_free_inline_type_shift, not_null_free_inline_type);
2290 }
2291
2292 void MacroAssembler::test_field_is_flat(Register flags, Register temp_reg, Label& is_flat) {
2293 assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2294 tbnz(flags, ResolvedFieldEntry::is_flat_shift, is_flat);
2295 }
2296
2297 void MacroAssembler::test_field_has_null_marker(Register flags, Register temp_reg, Label& has_null_marker) {
2298 assert(temp_reg == noreg, "not needed"); // keep signature uniform with x86
2299 tbnz(flags, ResolvedFieldEntry::has_null_marker_shift, has_null_marker);
2300 }
2301
2302 void MacroAssembler::test_oop_prototype_bit(Register oop, Register temp_reg, int32_t test_bit, bool jmp_set, Label& jmp_label) {
2303 Label test_mark_word;
2304 // load mark word
2305 ldr(temp_reg, Address(oop, oopDesc::mark_offset_in_bytes()));
2306 // check displaced
2307 tst(temp_reg, markWord::unlocked_value);
2308 br(Assembler::NE, test_mark_word);
2309 // slow path use klass prototype
2310 load_prototype_header(temp_reg, oop);
2311
2312 bind(test_mark_word);
2313 andr(temp_reg, temp_reg, test_bit);
2314 if (jmp_set) {
2315 cbnz(temp_reg, jmp_label);
2316 } else {
2317 cbz(temp_reg, jmp_label);
2318 }
2319 }
2320
2321 void MacroAssembler::test_flat_array_oop(Register oop, Register temp_reg, Label& is_flat_array) {
2322 test_oop_prototype_bit(oop, temp_reg, markWord::flat_array_bit_in_place, true, is_flat_array);
2323 }
2324
2325 void MacroAssembler::test_non_flat_array_oop(Register oop, Register temp_reg,
2326 Label&is_non_flat_array) {
2327 test_oop_prototype_bit(oop, temp_reg, markWord::flat_array_bit_in_place, false, is_non_flat_array);
2328 }
2329
2330 void MacroAssembler::test_null_free_array_oop(Register oop, Register temp_reg, Label& is_null_free_array) {
2331 test_oop_prototype_bit(oop, temp_reg, markWord::null_free_array_bit_in_place, true, is_null_free_array);
2332 }
2333
2334 void MacroAssembler::test_non_null_free_array_oop(Register oop, Register temp_reg, Label&is_non_null_free_array) {
2335 test_oop_prototype_bit(oop, temp_reg, markWord::null_free_array_bit_in_place, false, is_non_null_free_array);
2336 }
2337
2338 void MacroAssembler::test_flat_array_layout(Register lh, Label& is_flat_array) {
2339 tst(lh, Klass::_lh_array_tag_flat_value_bit_inplace);
2340 br(Assembler::NE, is_flat_array);
2341 }
2342
2343 void MacroAssembler::test_non_flat_array_layout(Register lh, Label& is_non_flat_array) {
2344 tst(lh, Klass::_lh_array_tag_flat_value_bit_inplace);
2345 br(Assembler::EQ, is_non_flat_array);
2346 }
2347
2348 // MacroAssembler protected routines needed to implement
2349 // public methods
2350
2351 void MacroAssembler::mov(Register r, Address dest) {
2352 code_section()->relocate(pc(), dest.rspec());
2353 uint64_t imm64 = (uint64_t)dest.target();
2354 movptr(r, imm64);
2355 }
2356
2357 // Move a constant pointer into r. In AArch64 mode the virtual
2358 // address space is 48 bits in size, so we only need three
2359 // instructions to create a patchable instruction sequence that can
2360 // reach anywhere.
2361 void MacroAssembler::movptr(Register r, uintptr_t imm64) {
2362 #ifndef PRODUCT
2363 {
2364 char buffer[64];
2365 snprintf(buffer, sizeof(buffer), "0x%" PRIX64, (uint64_t)imm64);
2366 block_comment(buffer);
2367 }
2368 #endif
2369 assert(imm64 < (1ull << 48), "48-bit overflow in address constant");
2370 movz(r, imm64 & 0xffff);
2371 imm64 >>= 16;
2372 movk(r, imm64 & 0xffff, 16);
2373 imm64 >>= 16;
2374 movk(r, imm64 & 0xffff, 32);
2375 }
2376
2377 // Macro to mov replicated immediate to vector register.
2378 // imm64: only the lower 8/16/32 bits are considered for B/H/S type. That is,
2379 // the upper 56/48/32 bits must be zeros for B/H/S type.
2380 // Vd will get the following values for different arrangements in T
2381 // imm64 == hex 000000gh T8B: Vd = ghghghghghghghgh
2382 // imm64 == hex 000000gh T16B: Vd = ghghghghghghghghghghghghghghghgh
2383 // imm64 == hex 0000efgh T4H: Vd = efghefghefghefgh
2384 // imm64 == hex 0000efgh T8H: Vd = efghefghefghefghefghefghefghefgh
2385 // imm64 == hex abcdefgh T2S: Vd = abcdefghabcdefgh
2386 // imm64 == hex abcdefgh T4S: Vd = abcdefghabcdefghabcdefghabcdefgh
2387 // imm64 == hex abcdefgh T1D: Vd = 00000000abcdefgh
2388 // imm64 == hex abcdefgh T2D: Vd = 00000000abcdefgh00000000abcdefgh
2389 // Clobbers rscratch1
2390 void MacroAssembler::mov(FloatRegister Vd, SIMD_Arrangement T, uint64_t imm64) {
2391 assert(T != T1Q, "unsupported");
2392 if (T == T1D || T == T2D) {
2393 int imm = operand_valid_for_movi_immediate(imm64, T);
2394 if (-1 != imm) {
2395 movi(Vd, T, imm);
2396 } else {
2397 mov(rscratch1, imm64);
2398 dup(Vd, T, rscratch1);
2399 }
2400 return;
2401 }
2402
2403 #ifdef ASSERT
2404 if (T == T8B || T == T16B) assert((imm64 & ~0xff) == 0, "extraneous bits (T8B/T16B)");
2405 if (T == T4H || T == T8H) assert((imm64 & ~0xffff) == 0, "extraneous bits (T4H/T8H)");
2406 if (T == T2S || T == T4S) assert((imm64 & ~0xffffffff) == 0, "extraneous bits (T2S/T4S)");
2407 #endif
2408 int shift = operand_valid_for_movi_immediate(imm64, T);
2409 uint32_t imm32 = imm64 & 0xffffffffULL;
2410 if (shift >= 0) {
2411 movi(Vd, T, (imm32 >> shift) & 0xff, shift);
2412 } else {
2413 movw(rscratch1, imm32);
2414 dup(Vd, T, rscratch1);
2415 }
2416 }
2417
2418 void MacroAssembler::mov_immediate64(Register dst, uint64_t imm64)
2419 {
2420 #ifndef PRODUCT
2421 {
2422 char buffer[64];
2423 snprintf(buffer, sizeof(buffer), "0x%" PRIX64, imm64);
2424 block_comment(buffer);
2425 }
2426 #endif
2427 if (operand_valid_for_logical_immediate(false, imm64)) {
2428 orr(dst, zr, imm64);
2429 } else {
2430 // we can use a combination of MOVZ or MOVN with
2431 // MOVK to build up the constant
2432 uint64_t imm_h[4];
2433 int zero_count = 0;
2434 int neg_count = 0;
2435 int i;
2436 for (i = 0; i < 4; i++) {
2437 imm_h[i] = ((imm64 >> (i * 16)) & 0xffffL);
2438 if (imm_h[i] == 0) {
2439 zero_count++;
2440 } else if (imm_h[i] == 0xffffL) {
2441 neg_count++;
2442 }
2443 }
2444 if (zero_count == 4) {
2445 // one MOVZ will do
2446 movz(dst, 0);
2447 } else if (neg_count == 4) {
2448 // one MOVN will do
2449 movn(dst, 0);
2450 } else if (zero_count == 3) {
2451 for (i = 0; i < 4; i++) {
2452 if (imm_h[i] != 0L) {
2453 movz(dst, (uint32_t)imm_h[i], (i << 4));
2454 break;
2455 }
2456 }
2457 } else if (neg_count == 3) {
2458 // one MOVN will do
2459 for (int i = 0; i < 4; i++) {
2460 if (imm_h[i] != 0xffffL) {
2461 movn(dst, (uint32_t)imm_h[i] ^ 0xffffL, (i << 4));
2462 break;
2463 }
2464 }
2465 } else if (zero_count == 2) {
2466 // one MOVZ and one MOVK will do
2467 for (i = 0; i < 3; i++) {
2468 if (imm_h[i] != 0L) {
2469 movz(dst, (uint32_t)imm_h[i], (i << 4));
2470 i++;
2471 break;
2472 }
2473 }
2474 for (;i < 4; i++) {
2475 if (imm_h[i] != 0L) {
2476 movk(dst, (uint32_t)imm_h[i], (i << 4));
2477 }
2478 }
2479 } else if (neg_count == 2) {
2480 // one MOVN and one MOVK will do
2481 for (i = 0; i < 4; i++) {
2482 if (imm_h[i] != 0xffffL) {
2483 movn(dst, (uint32_t)imm_h[i] ^ 0xffffL, (i << 4));
2484 i++;
2485 break;
2486 }
2487 }
2488 for (;i < 4; i++) {
2489 if (imm_h[i] != 0xffffL) {
2490 movk(dst, (uint32_t)imm_h[i], (i << 4));
2491 }
2492 }
2493 } else if (zero_count == 1) {
2494 // one MOVZ and two MOVKs will do
2495 for (i = 0; i < 4; i++) {
2496 if (imm_h[i] != 0L) {
2497 movz(dst, (uint32_t)imm_h[i], (i << 4));
2498 i++;
2499 break;
2500 }
2501 }
2502 for (;i < 4; i++) {
2503 if (imm_h[i] != 0x0L) {
2504 movk(dst, (uint32_t)imm_h[i], (i << 4));
2505 }
2506 }
2507 } else if (neg_count == 1) {
2508 // one MOVN and two MOVKs will do
2509 for (i = 0; i < 4; i++) {
2510 if (imm_h[i] != 0xffffL) {
2511 movn(dst, (uint32_t)imm_h[i] ^ 0xffffL, (i << 4));
2512 i++;
2513 break;
2514 }
2515 }
2516 for (;i < 4; i++) {
2517 if (imm_h[i] != 0xffffL) {
2518 movk(dst, (uint32_t)imm_h[i], (i << 4));
2519 }
2520 }
2521 } else {
2522 // use a MOVZ and 3 MOVKs (makes it easier to debug)
2523 movz(dst, (uint32_t)imm_h[0], 0);
2524 for (i = 1; i < 4; i++) {
2525 movk(dst, (uint32_t)imm_h[i], (i << 4));
2526 }
2527 }
2528 }
2529 }
2530
2531 void MacroAssembler::mov_immediate32(Register dst, uint32_t imm32)
2532 {
2533 #ifndef PRODUCT
2534 {
2535 char buffer[64];
2536 snprintf(buffer, sizeof(buffer), "0x%" PRIX32, imm32);
2537 block_comment(buffer);
2538 }
2539 #endif
2540 if (operand_valid_for_logical_immediate(true, imm32)) {
2541 orrw(dst, zr, imm32);
2542 } else {
2543 // we can use MOVZ, MOVN or two calls to MOVK to build up the
2544 // constant
2545 uint32_t imm_h[2];
2546 imm_h[0] = imm32 & 0xffff;
2547 imm_h[1] = ((imm32 >> 16) & 0xffff);
2548 if (imm_h[0] == 0) {
2549 movzw(dst, imm_h[1], 16);
2550 } else if (imm_h[0] == 0xffff) {
2551 movnw(dst, imm_h[1] ^ 0xffff, 16);
2552 } else if (imm_h[1] == 0) {
2553 movzw(dst, imm_h[0], 0);
2554 } else if (imm_h[1] == 0xffff) {
2555 movnw(dst, imm_h[0] ^ 0xffff, 0);
2556 } else {
2557 // use a MOVZ and MOVK (makes it easier to debug)
2558 movzw(dst, imm_h[0], 0);
2559 movkw(dst, imm_h[1], 16);
2560 }
2561 }
2562 }
2563
2564 // Form an address from base + offset in Rd. Rd may or may
2565 // not actually be used: you must use the Address that is returned.
2566 // It is up to you to ensure that the shift provided matches the size
2567 // of your data.
2568 Address MacroAssembler::form_address(Register Rd, Register base, int64_t byte_offset, int shift) {
2569 if (Address::offset_ok_for_immed(byte_offset, shift))
2570 // It fits; no need for any heroics
2571 return Address(base, byte_offset);
2572
2573 // Don't do anything clever with negative or misaligned offsets
2574 unsigned mask = (1 << shift) - 1;
2575 if (byte_offset < 0 || byte_offset & mask) {
2576 mov(Rd, byte_offset);
2577 add(Rd, base, Rd);
2578 return Address(Rd);
2579 }
2580
2581 // See if we can do this with two 12-bit offsets
2582 {
2583 uint64_t word_offset = byte_offset >> shift;
2584 uint64_t masked_offset = word_offset & 0xfff000;
2585 if (Address::offset_ok_for_immed(word_offset - masked_offset, 0)
2586 && Assembler::operand_valid_for_add_sub_immediate(masked_offset << shift)) {
2587 add(Rd, base, masked_offset << shift);
2588 word_offset -= masked_offset;
2589 return Address(Rd, word_offset << shift);
2590 }
2591 }
2592
2593 // Do it the hard way
2594 mov(Rd, byte_offset);
2595 add(Rd, base, Rd);
2596 return Address(Rd);
2597 }
2598
2599 int MacroAssembler::corrected_idivl(Register result, Register ra, Register rb,
2600 bool want_remainder, Register scratch)
2601 {
2602 // Full implementation of Java idiv and irem. The function
2603 // returns the (pc) offset of the div instruction - may be needed
2604 // for implicit exceptions.
2605 //
2606 // constraint : ra/rb =/= scratch
2607 // normal case
2608 //
2609 // input : ra: dividend
2610 // rb: divisor
2611 //
2612 // result: either
2613 // quotient (= ra idiv rb)
2614 // remainder (= ra irem rb)
2615
2616 assert(ra != scratch && rb != scratch, "reg cannot be scratch");
2617
2618 int idivl_offset = offset();
2619 if (! want_remainder) {
2620 sdivw(result, ra, rb);
2621 } else {
2622 sdivw(scratch, ra, rb);
2623 Assembler::msubw(result, scratch, rb, ra);
2624 }
2625
2626 return idivl_offset;
2627 }
2628
2629 int MacroAssembler::corrected_idivq(Register result, Register ra, Register rb,
2630 bool want_remainder, Register scratch)
2631 {
2632 // Full implementation of Java ldiv and lrem. The function
2633 // returns the (pc) offset of the div instruction - may be needed
2634 // for implicit exceptions.
2635 //
2636 // constraint : ra/rb =/= scratch
2637 // normal case
2638 //
2639 // input : ra: dividend
2640 // rb: divisor
2641 //
2642 // result: either
2643 // quotient (= ra idiv rb)
2644 // remainder (= ra irem rb)
2645
2646 assert(ra != scratch && rb != scratch, "reg cannot be scratch");
2647
2648 int idivq_offset = offset();
2649 if (! want_remainder) {
2650 sdiv(result, ra, rb);
2651 } else {
2652 sdiv(scratch, ra, rb);
2653 Assembler::msub(result, scratch, rb, ra);
2654 }
2655
2656 return idivq_offset;
2657 }
2658
2659 void MacroAssembler::membar(Membar_mask_bits order_constraint) {
2660 address prev = pc() - NativeMembar::instruction_size;
2661 address last = code()->last_insn();
2662 if (last != nullptr && nativeInstruction_at(last)->is_Membar() && prev == last) {
2663 NativeMembar *bar = NativeMembar_at(prev);
2664 if (AlwaysMergeDMB) {
2665 bar->set_kind(bar->get_kind() | order_constraint);
2666 BLOCK_COMMENT("merged membar(always)");
2667 return;
2668 }
2669 // Don't promote DMB ST|DMB LD to DMB (a full barrier) because
2670 // doing so would introduce a StoreLoad which the caller did not
2671 // intend
2672 if (bar->get_kind() == order_constraint
2673 || bar->get_kind() == AnyAny
2674 || order_constraint == AnyAny) {
2675 // We are merging two memory barrier instructions. On AArch64 we
2676 // can do this simply by ORing them together.
2677 bar->set_kind(bar->get_kind() | order_constraint);
2678 BLOCK_COMMENT("merged membar");
2679 return;
2680 } else {
2681 // A special case like "DMB ST;DMB LD;DMB ST", the last DMB can be skipped
2682 // We need check the last 2 instructions
2683 address prev2 = prev - NativeMembar::instruction_size;
2684 if (last != code()->last_label() && nativeInstruction_at(prev2)->is_Membar()) {
2685 NativeMembar *bar2 = NativeMembar_at(prev2);
2686 assert(bar2->get_kind() == order_constraint, "it should be merged before");
2687 BLOCK_COMMENT("merged membar(elided)");
2688 return;
2689 }
2690 }
2691 }
2692 code()->set_last_insn(pc());
2693 dmb(Assembler::barrier(order_constraint));
2694 }
2695
2696 bool MacroAssembler::try_merge_ldst(Register rt, const Address &adr, size_t size_in_bytes, bool is_store) {
2697 if (ldst_can_merge(rt, adr, size_in_bytes, is_store)) {
2698 merge_ldst(rt, adr, size_in_bytes, is_store);
2699 code()->clear_last_insn();
2700 return true;
2701 } else {
2702 assert(size_in_bytes == 8 || size_in_bytes == 4, "only 8 bytes or 4 bytes load/store is supported.");
2703 const uint64_t mask = size_in_bytes - 1;
2704 if (adr.getMode() == Address::base_plus_offset &&
2705 (adr.offset() & mask) == 0) { // only supports base_plus_offset.
2706 code()->set_last_insn(pc());
2707 }
2708 return false;
2709 }
2710 }
2711
2712 void MacroAssembler::ldr(Register Rx, const Address &adr) {
2713 // We always try to merge two adjacent loads into one ldp.
2714 if (!try_merge_ldst(Rx, adr, 8, false)) {
2715 Assembler::ldr(Rx, adr);
2716 }
2717 }
2718
2719 void MacroAssembler::ldrw(Register Rw, const Address &adr) {
2720 // We always try to merge two adjacent loads into one ldp.
2721 if (!try_merge_ldst(Rw, adr, 4, false)) {
2722 Assembler::ldrw(Rw, adr);
2723 }
2724 }
2725
2726 void MacroAssembler::str(Register Rx, const Address &adr) {
2727 // We always try to merge two adjacent stores into one stp.
2728 if (!try_merge_ldst(Rx, adr, 8, true)) {
2729 Assembler::str(Rx, adr);
2730 }
2731 }
2732
2733 void MacroAssembler::strw(Register Rw, const Address &adr) {
2734 // We always try to merge two adjacent stores into one stp.
2735 if (!try_merge_ldst(Rw, adr, 4, true)) {
2736 Assembler::strw(Rw, adr);
2737 }
2738 }
2739
2740 // MacroAssembler routines found actually to be needed
2741
2742 void MacroAssembler::push(Register src)
2743 {
2744 str(src, Address(pre(esp, -1 * wordSize)));
2745 }
2746
2747 void MacroAssembler::pop(Register dst)
2748 {
2749 ldr(dst, Address(post(esp, 1 * wordSize)));
2750 }
2751
2752 // Note: load_unsigned_short used to be called load_unsigned_word.
2753 int MacroAssembler::load_unsigned_short(Register dst, Address src) {
2754 int off = offset();
2755 ldrh(dst, src);
2756 return off;
2757 }
2758
2759 int MacroAssembler::load_unsigned_byte(Register dst, Address src) {
2760 int off = offset();
2761 ldrb(dst, src);
2762 return off;
2763 }
2764
2765 int MacroAssembler::load_signed_short(Register dst, Address src) {
2766 int off = offset();
2767 ldrsh(dst, src);
2768 return off;
2769 }
2770
2771 int MacroAssembler::load_signed_byte(Register dst, Address src) {
2772 int off = offset();
2773 ldrsb(dst, src);
2774 return off;
2775 }
2776
2777 int MacroAssembler::load_signed_short32(Register dst, Address src) {
2778 int off = offset();
2779 ldrshw(dst, src);
2780 return off;
2781 }
2782
2783 int MacroAssembler::load_signed_byte32(Register dst, Address src) {
2784 int off = offset();
2785 ldrsbw(dst, src);
2786 return off;
2787 }
2788
2789 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed) {
2790 switch (size_in_bytes) {
2791 case 8: ldr(dst, src); break;
2792 case 4: ldrw(dst, src); break;
2793 case 2: is_signed ? load_signed_short(dst, src) : load_unsigned_short(dst, src); break;
2794 case 1: is_signed ? load_signed_byte( dst, src) : load_unsigned_byte( dst, src); break;
2795 default: ShouldNotReachHere();
2796 }
2797 }
2798
2799 void MacroAssembler::store_sized_value(Address dst, Register src, size_t size_in_bytes) {
2800 switch (size_in_bytes) {
2801 case 8: str(src, dst); break;
2802 case 4: strw(src, dst); break;
2803 case 2: strh(src, dst); break;
2804 case 1: strb(src, dst); break;
2805 default: ShouldNotReachHere();
2806 }
2807 }
2808
2809 void MacroAssembler::decrementw(Register reg, int value)
2810 {
2811 if (value < 0) { incrementw(reg, -value); return; }
2812 if (value == 0) { return; }
2813 if (value < (1 << 12)) { subw(reg, reg, value); return; }
2814 /* else */ {
2815 guarantee(reg != rscratch2, "invalid dst for register decrement");
2816 movw(rscratch2, (unsigned)value);
2817 subw(reg, reg, rscratch2);
2818 }
2819 }
2820
2821 void MacroAssembler::decrement(Register reg, int value)
2822 {
2823 if (value < 0) { increment(reg, -value); return; }
2824 if (value == 0) { return; }
2825 if (value < (1 << 12)) { sub(reg, reg, value); return; }
2826 /* else */ {
2827 assert(reg != rscratch2, "invalid dst for register decrement");
2828 mov(rscratch2, (uint64_t)value);
2829 sub(reg, reg, rscratch2);
2830 }
2831 }
2832
2833 void MacroAssembler::decrementw(Address dst, int value)
2834 {
2835 assert(!dst.uses(rscratch1), "invalid dst for address decrement");
2836 if (dst.getMode() == Address::literal) {
2837 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2838 lea(rscratch2, dst);
2839 dst = Address(rscratch2);
2840 }
2841 ldrw(rscratch1, dst);
2842 decrementw(rscratch1, value);
2843 strw(rscratch1, dst);
2844 }
2845
2846 void MacroAssembler::decrement(Address dst, int value)
2847 {
2848 assert(!dst.uses(rscratch1), "invalid address for decrement");
2849 if (dst.getMode() == Address::literal) {
2850 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2851 lea(rscratch2, dst);
2852 dst = Address(rscratch2);
2853 }
2854 ldr(rscratch1, dst);
2855 decrement(rscratch1, value);
2856 str(rscratch1, dst);
2857 }
2858
2859 void MacroAssembler::incrementw(Register reg, int value)
2860 {
2861 if (value < 0) { decrementw(reg, -value); return; }
2862 if (value == 0) { return; }
2863 if (value < (1 << 12)) { addw(reg, reg, value); return; }
2864 /* else */ {
2865 assert(reg != rscratch2, "invalid dst for register increment");
2866 movw(rscratch2, (unsigned)value);
2867 addw(reg, reg, rscratch2);
2868 }
2869 }
2870
2871 void MacroAssembler::increment(Register reg, int value)
2872 {
2873 if (value < 0) { decrement(reg, -value); return; }
2874 if (value == 0) { return; }
2875 if (value < (1 << 12)) { add(reg, reg, value); return; }
2876 /* else */ {
2877 assert(reg != rscratch2, "invalid dst for register increment");
2878 movw(rscratch2, (unsigned)value);
2879 add(reg, reg, rscratch2);
2880 }
2881 }
2882
2883 void MacroAssembler::incrementw(Address dst, int value)
2884 {
2885 assert(!dst.uses(rscratch1), "invalid dst for address increment");
2886 if (dst.getMode() == Address::literal) {
2887 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2888 lea(rscratch2, dst);
2889 dst = Address(rscratch2);
2890 }
2891 ldrw(rscratch1, dst);
2892 incrementw(rscratch1, value);
2893 strw(rscratch1, dst);
2894 }
2895
2896 void MacroAssembler::increment(Address dst, int value)
2897 {
2898 assert(!dst.uses(rscratch1), "invalid dst for address increment");
2899 if (dst.getMode() == Address::literal) {
2900 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2901 lea(rscratch2, dst);
2902 dst = Address(rscratch2);
2903 }
2904 ldr(rscratch1, dst);
2905 increment(rscratch1, value);
2906 str(rscratch1, dst);
2907 }
2908
2909 // Push lots of registers in the bit set supplied. Don't push sp.
2910 // Return the number of words pushed
2911 int MacroAssembler::push(unsigned int bitset, Register stack) {
2912 int words_pushed = 0;
2913
2914 // Scan bitset to accumulate register pairs
2915 unsigned char regs[32];
2916 int count = 0;
2917 for (int reg = 0; reg <= 30; reg++) {
2918 if (1 & bitset)
2919 regs[count++] = reg;
2920 bitset >>= 1;
2921 }
2922 regs[count++] = zr->raw_encoding();
2923 count &= ~1; // Only push an even number of regs
2924
2925 if (count) {
2926 stp(as_Register(regs[0]), as_Register(regs[1]),
2927 Address(pre(stack, -count * wordSize)));
2928 words_pushed += 2;
2929 }
2930 for (int i = 2; i < count; i += 2) {
2931 stp(as_Register(regs[i]), as_Register(regs[i+1]),
2932 Address(stack, i * wordSize));
2933 words_pushed += 2;
2934 }
2935
2936 assert(words_pushed == count, "oops, pushed != count");
2937
2938 return count;
2939 }
2940
2941 int MacroAssembler::pop(unsigned int bitset, Register stack) {
2942 int words_pushed = 0;
2943
2944 // Scan bitset to accumulate register pairs
2945 unsigned char regs[32];
2946 int count = 0;
2947 for (int reg = 0; reg <= 30; reg++) {
2948 if (1 & bitset)
2949 regs[count++] = reg;
2950 bitset >>= 1;
2951 }
2952 regs[count++] = zr->raw_encoding();
2953 count &= ~1;
2954
2955 for (int i = 2; i < count; i += 2) {
2956 ldp(as_Register(regs[i]), as_Register(regs[i+1]),
2957 Address(stack, i * wordSize));
2958 words_pushed += 2;
2959 }
2960 if (count) {
2961 ldp(as_Register(regs[0]), as_Register(regs[1]),
2962 Address(post(stack, count * wordSize)));
2963 words_pushed += 2;
2964 }
2965
2966 assert(words_pushed == count, "oops, pushed != count");
2967
2968 return count;
2969 }
2970
2971 // Push lots of registers in the bit set supplied. Don't push sp.
2972 // Return the number of dwords pushed
2973 int MacroAssembler::push_fp(unsigned int bitset, Register stack, FpPushPopMode mode) {
2974 int words_pushed = 0;
2975 bool use_sve = false;
2976 int sve_vector_size_in_bytes = 0;
2977
2978 #ifdef COMPILER2
2979 use_sve = Matcher::supports_scalable_vector();
2980 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
2981 #endif
2982
2983 // Scan bitset to accumulate register pairs
2984 unsigned char regs[32];
2985 int count = 0;
2986 for (int reg = 0; reg <= 31; reg++) {
2987 if (1 & bitset)
2988 regs[count++] = reg;
2989 bitset >>= 1;
2990 }
2991
2992 if (count == 0) {
2993 return 0;
2994 }
2995
2996 if (mode == PushPopFull) {
2997 if (use_sve && sve_vector_size_in_bytes > 16) {
2998 mode = PushPopSVE;
2999 } else {
3000 mode = PushPopNeon;
3001 }
3002 }
3003
3004 #ifndef PRODUCT
3005 {
3006 char buffer[48];
3007 if (mode == PushPopSVE) {
3008 snprintf(buffer, sizeof(buffer), "push_fp: %d SVE registers", count);
3009 } else if (mode == PushPopNeon) {
3010 snprintf(buffer, sizeof(buffer), "push_fp: %d Neon registers", count);
3011 } else {
3012 snprintf(buffer, sizeof(buffer), "push_fp: %d fp registers", count);
3013 }
3014 block_comment(buffer);
3015 }
3016 #endif
3017
3018 if (mode == PushPopSVE) {
3019 sub(stack, stack, sve_vector_size_in_bytes * count);
3020 for (int i = 0; i < count; i++) {
3021 sve_str(as_FloatRegister(regs[i]), Address(stack, i));
3022 }
3023 return count * sve_vector_size_in_bytes / 8;
3024 }
3025
3026 if (mode == PushPopNeon) {
3027 if (count == 1) {
3028 strq(as_FloatRegister(regs[0]), Address(pre(stack, -wordSize * 2)));
3029 return 2;
3030 }
3031
3032 bool odd = (count & 1) == 1;
3033 int push_slots = count + (odd ? 1 : 0);
3034
3035 // Always pushing full 128 bit registers.
3036 stpq(as_FloatRegister(regs[0]), as_FloatRegister(regs[1]), Address(pre(stack, -push_slots * wordSize * 2)));
3037 words_pushed += 2;
3038
3039 for (int i = 2; i + 1 < count; i += 2) {
3040 stpq(as_FloatRegister(regs[i]), as_FloatRegister(regs[i+1]), Address(stack, i * wordSize * 2));
3041 words_pushed += 2;
3042 }
3043
3044 if (odd) {
3045 strq(as_FloatRegister(regs[count - 1]), Address(stack, (count - 1) * wordSize * 2));
3046 words_pushed++;
3047 }
3048
3049 assert(words_pushed == count, "oops, pushed(%d) != count(%d)", words_pushed, count);
3050 return count * 2;
3051 }
3052
3053 if (mode == PushPopFp) {
3054 bool odd = (count & 1) == 1;
3055 int push_slots = count + (odd ? 1 : 0);
3056
3057 if (count == 1) {
3058 // Stack pointer must be 16 bytes aligned
3059 strd(as_FloatRegister(regs[0]), Address(pre(stack, -push_slots * wordSize)));
3060 return 1;
3061 }
3062
3063 stpd(as_FloatRegister(regs[0]), as_FloatRegister(regs[1]), Address(pre(stack, -push_slots * wordSize)));
3064 words_pushed += 2;
3065
3066 for (int i = 2; i + 1 < count; i += 2) {
3067 stpd(as_FloatRegister(regs[i]), as_FloatRegister(regs[i+1]), Address(stack, i * wordSize));
3068 words_pushed += 2;
3069 }
3070
3071 if (odd) {
3072 // Stack pointer must be 16 bytes aligned
3073 strd(as_FloatRegister(regs[count - 1]), Address(stack, (count - 1) * wordSize));
3074 words_pushed++;
3075 }
3076
3077 assert(words_pushed == count, "oops, pushed != count");
3078
3079 return count;
3080 }
3081
3082 return 0;
3083 }
3084
3085 // Return the number of dwords popped
3086 int MacroAssembler::pop_fp(unsigned int bitset, Register stack, FpPushPopMode mode) {
3087 int words_pushed = 0;
3088 bool use_sve = false;
3089 int sve_vector_size_in_bytes = 0;
3090
3091 #ifdef COMPILER2
3092 use_sve = Matcher::supports_scalable_vector();
3093 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
3094 #endif
3095 // Scan bitset to accumulate register pairs
3096 unsigned char regs[32];
3097 int count = 0;
3098 for (int reg = 0; reg <= 31; reg++) {
3099 if (1 & bitset)
3100 regs[count++] = reg;
3101 bitset >>= 1;
3102 }
3103
3104 if (count == 0) {
3105 return 0;
3106 }
3107
3108 if (mode == PushPopFull) {
3109 if (use_sve && sve_vector_size_in_bytes > 16) {
3110 mode = PushPopSVE;
3111 } else {
3112 mode = PushPopNeon;
3113 }
3114 }
3115
3116 #ifndef PRODUCT
3117 {
3118 char buffer[48];
3119 if (mode == PushPopSVE) {
3120 snprintf(buffer, sizeof(buffer), "pop_fp: %d SVE registers", count);
3121 } else if (mode == PushPopNeon) {
3122 snprintf(buffer, sizeof(buffer), "pop_fp: %d Neon registers", count);
3123 } else {
3124 snprintf(buffer, sizeof(buffer), "pop_fp: %d fp registers", count);
3125 }
3126 block_comment(buffer);
3127 }
3128 #endif
3129
3130 if (mode == PushPopSVE) {
3131 for (int i = count - 1; i >= 0; i--) {
3132 sve_ldr(as_FloatRegister(regs[i]), Address(stack, i));
3133 }
3134 add(stack, stack, sve_vector_size_in_bytes * count);
3135 return count * sve_vector_size_in_bytes / 8;
3136 }
3137
3138 if (mode == PushPopNeon) {
3139 if (count == 1) {
3140 ldrq(as_FloatRegister(regs[0]), Address(post(stack, wordSize * 2)));
3141 return 2;
3142 }
3143
3144 bool odd = (count & 1) == 1;
3145 int push_slots = count + (odd ? 1 : 0);
3146
3147 if (odd) {
3148 ldrq(as_FloatRegister(regs[count - 1]), Address(stack, (count - 1) * wordSize * 2));
3149 words_pushed++;
3150 }
3151
3152 for (int i = 2; i + 1 < count; i += 2) {
3153 ldpq(as_FloatRegister(regs[i]), as_FloatRegister(regs[i+1]), Address(stack, i * wordSize * 2));
3154 words_pushed += 2;
3155 }
3156
3157 ldpq(as_FloatRegister(regs[0]), as_FloatRegister(regs[1]), Address(post(stack, push_slots * wordSize * 2)));
3158 words_pushed += 2;
3159
3160 assert(words_pushed == count, "oops, pushed(%d) != count(%d)", words_pushed, count);
3161
3162 return count * 2;
3163 }
3164
3165 if (mode == PushPopFp) {
3166 bool odd = (count & 1) == 1;
3167 int push_slots = count + (odd ? 1 : 0);
3168
3169 if (count == 1) {
3170 ldrd(as_FloatRegister(regs[0]), Address(post(stack, push_slots * wordSize)));
3171 return 1;
3172 }
3173
3174 if (odd) {
3175 ldrd(as_FloatRegister(regs[count - 1]), Address(stack, (count - 1) * wordSize));
3176 words_pushed++;
3177 }
3178
3179 for (int i = 2; i + 1 < count; i += 2) {
3180 ldpd(as_FloatRegister(regs[i]), as_FloatRegister(regs[i+1]), Address(stack, i * wordSize));
3181 words_pushed += 2;
3182 }
3183
3184 ldpd(as_FloatRegister(regs[0]), as_FloatRegister(regs[1]), Address(post(stack, push_slots * wordSize)));
3185 words_pushed += 2;
3186
3187 assert(words_pushed == count, "oops, pushed != count");
3188
3189 return count;
3190 }
3191
3192 return 0;
3193 }
3194
3195 // Return the number of dwords pushed
3196 int MacroAssembler::push_p(unsigned int bitset, Register stack) {
3197 bool use_sve = false;
3198 int sve_predicate_size_in_slots = 0;
3199
3200 #ifdef COMPILER2
3201 use_sve = Matcher::supports_scalable_vector();
3202 if (use_sve) {
3203 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
3204 }
3205 #endif
3206
3207 if (!use_sve) {
3208 return 0;
3209 }
3210
3211 unsigned char regs[PRegister::number_of_registers];
3212 int count = 0;
3213 for (int reg = 0; reg < PRegister::number_of_registers; reg++) {
3214 if (1 & bitset)
3215 regs[count++] = reg;
3216 bitset >>= 1;
3217 }
3218
3219 if (count == 0) {
3220 return 0;
3221 }
3222
3223 int total_push_bytes = align_up(sve_predicate_size_in_slots *
3224 VMRegImpl::stack_slot_size * count, 16);
3225 sub(stack, stack, total_push_bytes);
3226 for (int i = 0; i < count; i++) {
3227 sve_str(as_PRegister(regs[i]), Address(stack, i));
3228 }
3229 return total_push_bytes / 8;
3230 }
3231
3232 // Return the number of dwords popped
3233 int MacroAssembler::pop_p(unsigned int bitset, Register stack) {
3234 bool use_sve = false;
3235 int sve_predicate_size_in_slots = 0;
3236
3237 #ifdef COMPILER2
3238 use_sve = Matcher::supports_scalable_vector();
3239 if (use_sve) {
3240 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
3241 }
3242 #endif
3243
3244 if (!use_sve) {
3245 return 0;
3246 }
3247
3248 unsigned char regs[PRegister::number_of_registers];
3249 int count = 0;
3250 for (int reg = 0; reg < PRegister::number_of_registers; reg++) {
3251 if (1 & bitset)
3252 regs[count++] = reg;
3253 bitset >>= 1;
3254 }
3255
3256 if (count == 0) {
3257 return 0;
3258 }
3259
3260 int total_pop_bytes = align_up(sve_predicate_size_in_slots *
3261 VMRegImpl::stack_slot_size * count, 16);
3262 for (int i = count - 1; i >= 0; i--) {
3263 sve_ldr(as_PRegister(regs[i]), Address(stack, i));
3264 }
3265 add(stack, stack, total_pop_bytes);
3266 return total_pop_bytes / 8;
3267 }
3268
3269 #ifdef ASSERT
3270 void MacroAssembler::verify_heapbase(const char* msg) {
3271 #if 0
3272 assert (UseCompressedOops || UseCompressedClassPointers, "should be compressed");
3273 assert (Universe::heap() != nullptr, "java heap should be initialized");
3274 if (!UseCompressedOops || Universe::ptr_base() == nullptr) {
3275 // rheapbase is allocated as general register
3276 return;
3277 }
3278 if (CheckCompressedOops) {
3279 Label ok;
3280 push(1 << rscratch1->encoding(), sp); // cmpptr trashes rscratch1
3281 cmpptr(rheapbase, ExternalAddress(CompressedOops::base_addr()));
3282 br(Assembler::EQ, ok);
3283 stop(msg);
3284 bind(ok);
3285 pop(1 << rscratch1->encoding(), sp);
3286 }
3287 #endif
3288 }
3289 #endif
3290
3291 void MacroAssembler::resolve_jobject(Register value, Register tmp1, Register tmp2) {
3292 assert_different_registers(value, tmp1, tmp2);
3293 Label done, tagged, weak_tagged;
3294
3295 cbz(value, done); // Use null as-is.
3296 tst(value, JNIHandles::tag_mask); // Test for tag.
3297 br(Assembler::NE, tagged);
3298
3299 // Resolve local handle
3300 access_load_at(T_OBJECT, IN_NATIVE | AS_RAW, value, Address(value, 0), tmp1, tmp2);
3301 verify_oop(value);
3302 b(done);
3303
3304 bind(tagged);
3305 STATIC_ASSERT(JNIHandles::TypeTag::weak_global == 0b1);
3306 tbnz(value, 0, weak_tagged); // Test for weak tag.
3307
3308 // Resolve global handle
3309 access_load_at(T_OBJECT, IN_NATIVE, value, Address(value, -JNIHandles::TypeTag::global), tmp1, tmp2);
3310 verify_oop(value);
3311 b(done);
3312
3313 bind(weak_tagged);
3314 // Resolve jweak.
3315 access_load_at(T_OBJECT, IN_NATIVE | ON_PHANTOM_OOP_REF,
3316 value, Address(value, -JNIHandles::TypeTag::weak_global), tmp1, tmp2);
3317 verify_oop(value);
3318
3319 bind(done);
3320 }
3321
3322 void MacroAssembler::resolve_global_jobject(Register value, Register tmp1, Register tmp2) {
3323 assert_different_registers(value, tmp1, tmp2);
3324 Label done;
3325
3326 cbz(value, done); // Use null as-is.
3327
3328 #ifdef ASSERT
3329 {
3330 STATIC_ASSERT(JNIHandles::TypeTag::global == 0b10);
3331 Label valid_global_tag;
3332 tbnz(value, 1, valid_global_tag); // Test for global tag
3333 stop("non global jobject using resolve_global_jobject");
3334 bind(valid_global_tag);
3335 }
3336 #endif
3337
3338 // Resolve global handle
3339 access_load_at(T_OBJECT, IN_NATIVE, value, Address(value, -JNIHandles::TypeTag::global), tmp1, tmp2);
3340 verify_oop(value);
3341
3342 bind(done);
3343 }
3344
3345 void MacroAssembler::stop(const char* msg) {
3346 BLOCK_COMMENT(msg);
3347 dcps1(0xdeae);
3348 emit_int64((uintptr_t)msg);
3349 }
3350
3351 void MacroAssembler::unimplemented(const char* what) {
3352 const char* buf = nullptr;
3353 {
3354 ResourceMark rm;
3355 stringStream ss;
3356 ss.print("unimplemented: %s", what);
3357 buf = code_string(ss.as_string());
3358 }
3359 stop(buf);
3360 }
3361
3362 void MacroAssembler::_assert_asm(Assembler::Condition cc, const char* msg) {
3363 #ifdef ASSERT
3364 Label OK;
3365 br(cc, OK);
3366 stop(msg);
3367 bind(OK);
3368 #endif
3369 }
3370
3371 // If a constant does not fit in an immediate field, generate some
3372 // number of MOV instructions and then perform the operation.
3373 void MacroAssembler::wrap_add_sub_imm_insn(Register Rd, Register Rn, uint64_t imm,
3374 add_sub_imm_insn insn1,
3375 add_sub_reg_insn insn2,
3376 bool is32) {
3377 assert(Rd != zr, "Rd = zr and not setting flags?");
3378 bool fits = operand_valid_for_add_sub_immediate(is32 ? (int32_t)imm : imm);
3379 if (fits) {
3380 (this->*insn1)(Rd, Rn, imm);
3381 } else {
3382 if (uabs(imm) < (1 << 24)) {
3383 (this->*insn1)(Rd, Rn, imm & -(1 << 12));
3384 (this->*insn1)(Rd, Rd, imm & ((1 << 12)-1));
3385 } else {
3386 assert_different_registers(Rd, Rn);
3387 mov(Rd, imm);
3388 (this->*insn2)(Rd, Rn, Rd, LSL, 0);
3389 }
3390 }
3391 }
3392
3393 // Separate vsn which sets the flags. Optimisations are more restricted
3394 // because we must set the flags correctly.
3395 void MacroAssembler::wrap_adds_subs_imm_insn(Register Rd, Register Rn, uint64_t imm,
3396 add_sub_imm_insn insn1,
3397 add_sub_reg_insn insn2,
3398 bool is32) {
3399 bool fits = operand_valid_for_add_sub_immediate(is32 ? (int32_t)imm : imm);
3400 if (fits) {
3401 (this->*insn1)(Rd, Rn, imm);
3402 } else {
3403 assert_different_registers(Rd, Rn);
3404 assert(Rd != zr, "overflow in immediate operand");
3405 mov(Rd, imm);
3406 (this->*insn2)(Rd, Rn, Rd, LSL, 0);
3407 }
3408 }
3409
3410
3411 void MacroAssembler::add(Register Rd, Register Rn, RegisterOrConstant increment) {
3412 if (increment.is_register()) {
3413 add(Rd, Rn, increment.as_register());
3414 } else {
3415 add(Rd, Rn, increment.as_constant());
3416 }
3417 }
3418
3419 void MacroAssembler::addw(Register Rd, Register Rn, RegisterOrConstant increment) {
3420 if (increment.is_register()) {
3421 addw(Rd, Rn, increment.as_register());
3422 } else {
3423 addw(Rd, Rn, increment.as_constant());
3424 }
3425 }
3426
3427 void MacroAssembler::sub(Register Rd, Register Rn, RegisterOrConstant decrement) {
3428 if (decrement.is_register()) {
3429 sub(Rd, Rn, decrement.as_register());
3430 } else {
3431 sub(Rd, Rn, decrement.as_constant());
3432 }
3433 }
3434
3435 void MacroAssembler::subw(Register Rd, Register Rn, RegisterOrConstant decrement) {
3436 if (decrement.is_register()) {
3437 subw(Rd, Rn, decrement.as_register());
3438 } else {
3439 subw(Rd, Rn, decrement.as_constant());
3440 }
3441 }
3442
3443 void MacroAssembler::reinit_heapbase()
3444 {
3445 if (UseCompressedOops) {
3446 if (Universe::is_fully_initialized()) {
3447 mov(rheapbase, CompressedOops::base());
3448 } else {
3449 lea(rheapbase, ExternalAddress(CompressedOops::base_addr()));
3450 ldr(rheapbase, Address(rheapbase));
3451 }
3452 }
3453 }
3454
3455 // this simulates the behaviour of the x86 cmpxchg instruction using a
3456 // load linked/store conditional pair. we use the acquire/release
3457 // versions of these instructions so that we flush pending writes as
3458 // per Java semantics.
3459
3460 // n.b the x86 version assumes the old value to be compared against is
3461 // in rax and updates rax with the value located in memory if the
3462 // cmpxchg fails. we supply a register for the old value explicitly
3463
3464 // the aarch64 load linked/store conditional instructions do not
3465 // accept an offset. so, unlike x86, we must provide a plain register
3466 // to identify the memory word to be compared/exchanged rather than a
3467 // register+offset Address.
3468
3469 void MacroAssembler::cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp,
3470 Label &succeed, Label *fail) {
3471 // oldv holds comparison value
3472 // newv holds value to write in exchange
3473 // addr identifies memory word to compare against/update
3474 if (UseLSE) {
3475 mov(tmp, oldv);
3476 casal(Assembler::xword, oldv, newv, addr);
3477 cmp(tmp, oldv);
3478 br(Assembler::EQ, succeed);
3479 membar(AnyAny);
3480 } else {
3481 Label retry_load, nope;
3482 prfm(Address(addr), PSTL1STRM);
3483 bind(retry_load);
3484 // flush and load exclusive from the memory location
3485 // and fail if it is not what we expect
3486 ldaxr(tmp, addr);
3487 cmp(tmp, oldv);
3488 br(Assembler::NE, nope);
3489 // if we store+flush with no intervening write tmp will be zero
3490 stlxr(tmp, newv, addr);
3491 cbzw(tmp, succeed);
3492 // retry so we only ever return after a load fails to compare
3493 // ensures we don't return a stale value after a failed write.
3494 b(retry_load);
3495 // if the memory word differs we return it in oldv and signal a fail
3496 bind(nope);
3497 membar(AnyAny);
3498 mov(oldv, tmp);
3499 }
3500 if (fail)
3501 b(*fail);
3502 }
3503
3504 void MacroAssembler::cmpxchg_obj_header(Register oldv, Register newv, Register obj, Register tmp,
3505 Label &succeed, Label *fail) {
3506 assert(oopDesc::mark_offset_in_bytes() == 0, "assumption");
3507 cmpxchgptr(oldv, newv, obj, tmp, succeed, fail);
3508 }
3509
3510 void MacroAssembler::cmpxchgw(Register oldv, Register newv, Register addr, Register tmp,
3511 Label &succeed, Label *fail) {
3512 // oldv holds comparison value
3513 // newv holds value to write in exchange
3514 // addr identifies memory word to compare against/update
3515 // tmp returns 0/1 for success/failure
3516 if (UseLSE) {
3517 mov(tmp, oldv);
3518 casal(Assembler::word, oldv, newv, addr);
3519 cmp(tmp, oldv);
3520 br(Assembler::EQ, succeed);
3521 membar(AnyAny);
3522 } else {
3523 Label retry_load, nope;
3524 prfm(Address(addr), PSTL1STRM);
3525 bind(retry_load);
3526 // flush and load exclusive from the memory location
3527 // and fail if it is not what we expect
3528 ldaxrw(tmp, addr);
3529 cmp(tmp, oldv);
3530 br(Assembler::NE, nope);
3531 // if we store+flush with no intervening write tmp will be zero
3532 stlxrw(tmp, newv, addr);
3533 cbzw(tmp, succeed);
3534 // retry so we only ever return after a load fails to compare
3535 // ensures we don't return a stale value after a failed write.
3536 b(retry_load);
3537 // if the memory word differs we return it in oldv and signal a fail
3538 bind(nope);
3539 membar(AnyAny);
3540 mov(oldv, tmp);
3541 }
3542 if (fail)
3543 b(*fail);
3544 }
3545
3546 // A generic CAS; success or failure is in the EQ flag. A weak CAS
3547 // doesn't retry and may fail spuriously. If the oldval is wanted,
3548 // Pass a register for the result, otherwise pass noreg.
3549
3550 // Clobbers rscratch1
3551 void MacroAssembler::cmpxchg(Register addr, Register expected,
3552 Register new_val,
3553 enum operand_size size,
3554 bool acquire, bool release,
3555 bool weak,
3556 Register result) {
3557 if (result == noreg) result = rscratch1;
3558 BLOCK_COMMENT("cmpxchg {");
3559 if (UseLSE) {
3560 mov(result, expected);
3561 lse_cas(result, new_val, addr, size, acquire, release, /*not_pair*/ true);
3562 compare_eq(result, expected, size);
3563 #ifdef ASSERT
3564 // Poison rscratch1 which is written on !UseLSE branch
3565 mov(rscratch1, 0x1f1f1f1f1f1f1f1f);
3566 #endif
3567 } else {
3568 Label retry_load, done;
3569 prfm(Address(addr), PSTL1STRM);
3570 bind(retry_load);
3571 load_exclusive(result, addr, size, acquire);
3572 compare_eq(result, expected, size);
3573 br(Assembler::NE, done);
3574 store_exclusive(rscratch1, new_val, addr, size, release);
3575 if (weak) {
3576 cmpw(rscratch1, 0u); // If the store fails, return NE to our caller.
3577 } else {
3578 cbnzw(rscratch1, retry_load);
3579 }
3580 bind(done);
3581 }
3582 BLOCK_COMMENT("} cmpxchg");
3583 }
3584
3585 // A generic comparison. Only compares for equality, clobbers rscratch1.
3586 void MacroAssembler::compare_eq(Register rm, Register rn, enum operand_size size) {
3587 if (size == xword) {
3588 cmp(rm, rn);
3589 } else if (size == word) {
3590 cmpw(rm, rn);
3591 } else if (size == halfword) {
3592 eorw(rscratch1, rm, rn);
3593 ands(zr, rscratch1, 0xffff);
3594 } else if (size == byte) {
3595 eorw(rscratch1, rm, rn);
3596 ands(zr, rscratch1, 0xff);
3597 } else {
3598 ShouldNotReachHere();
3599 }
3600 }
3601
3602
3603 static bool different(Register a, RegisterOrConstant b, Register c) {
3604 if (b.is_constant())
3605 return a != c;
3606 else
3607 return a != b.as_register() && a != c && b.as_register() != c;
3608 }
3609
3610 #define ATOMIC_OP(NAME, LDXR, OP, IOP, AOP, STXR, sz) \
3611 void MacroAssembler::atomic_##NAME(Register prev, RegisterOrConstant incr, Register addr) { \
3612 if (UseLSE) { \
3613 prev = prev->is_valid() ? prev : zr; \
3614 if (incr.is_register()) { \
3615 AOP(sz, incr.as_register(), prev, addr); \
3616 } else { \
3617 mov(rscratch2, incr.as_constant()); \
3618 AOP(sz, rscratch2, prev, addr); \
3619 } \
3620 return; \
3621 } \
3622 Register result = rscratch2; \
3623 if (prev->is_valid()) \
3624 result = different(prev, incr, addr) ? prev : rscratch2; \
3625 \
3626 Label retry_load; \
3627 prfm(Address(addr), PSTL1STRM); \
3628 bind(retry_load); \
3629 LDXR(result, addr); \
3630 OP(rscratch1, result, incr); \
3631 STXR(rscratch2, rscratch1, addr); \
3632 cbnzw(rscratch2, retry_load); \
3633 if (prev->is_valid() && prev != result) { \
3634 IOP(prev, rscratch1, incr); \
3635 } \
3636 }
3637
3638 ATOMIC_OP(add, ldxr, add, sub, ldadd, stxr, Assembler::xword)
3639 ATOMIC_OP(addw, ldxrw, addw, subw, ldadd, stxrw, Assembler::word)
3640 ATOMIC_OP(addal, ldaxr, add, sub, ldaddal, stlxr, Assembler::xword)
3641 ATOMIC_OP(addalw, ldaxrw, addw, subw, ldaddal, stlxrw, Assembler::word)
3642
3643 #undef ATOMIC_OP
3644
3645 #define ATOMIC_XCHG(OP, AOP, LDXR, STXR, sz) \
3646 void MacroAssembler::atomic_##OP(Register prev, Register newv, Register addr) { \
3647 if (UseLSE) { \
3648 prev = prev->is_valid() ? prev : zr; \
3649 AOP(sz, newv, prev, addr); \
3650 return; \
3651 } \
3652 Register result = rscratch2; \
3653 if (prev->is_valid()) \
3654 result = different(prev, newv, addr) ? prev : rscratch2; \
3655 \
3656 Label retry_load; \
3657 prfm(Address(addr), PSTL1STRM); \
3658 bind(retry_load); \
3659 LDXR(result, addr); \
3660 STXR(rscratch1, newv, addr); \
3661 cbnzw(rscratch1, retry_load); \
3662 if (prev->is_valid() && prev != result) \
3663 mov(prev, result); \
3664 }
3665
3666 ATOMIC_XCHG(xchg, swp, ldxr, stxr, Assembler::xword)
3667 ATOMIC_XCHG(xchgw, swp, ldxrw, stxrw, Assembler::word)
3668 ATOMIC_XCHG(xchgl, swpl, ldxr, stlxr, Assembler::xword)
3669 ATOMIC_XCHG(xchglw, swpl, ldxrw, stlxrw, Assembler::word)
3670 ATOMIC_XCHG(xchgal, swpal, ldaxr, stlxr, Assembler::xword)
3671 ATOMIC_XCHG(xchgalw, swpal, ldaxrw, stlxrw, Assembler::word)
3672
3673 #undef ATOMIC_XCHG
3674
3675 #ifndef PRODUCT
3676 extern "C" void findpc(intptr_t x);
3677 #endif
3678
3679 void MacroAssembler::debug64(char* msg, int64_t pc, int64_t regs[])
3680 {
3681 // In order to get locks to work, we need to fake a in_VM state
3682 if (ShowMessageBoxOnError ) {
3683 JavaThread* thread = JavaThread::current();
3684 JavaThreadState saved_state = thread->thread_state();
3685 thread->set_thread_state(_thread_in_vm);
3686 #ifndef PRODUCT
3687 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
3688 ttyLocker ttyl;
3689 BytecodeCounter::print();
3690 }
3691 #endif
3692 if (os::message_box(msg, "Execution stopped, print registers?")) {
3693 ttyLocker ttyl;
3694 tty->print_cr(" pc = 0x%016" PRIx64, pc);
3695 #ifndef PRODUCT
3696 tty->cr();
3697 findpc(pc);
3698 tty->cr();
3699 #endif
3700 tty->print_cr(" r0 = 0x%016" PRIx64, regs[0]);
3701 tty->print_cr(" r1 = 0x%016" PRIx64, regs[1]);
3702 tty->print_cr(" r2 = 0x%016" PRIx64, regs[2]);
3703 tty->print_cr(" r3 = 0x%016" PRIx64, regs[3]);
3704 tty->print_cr(" r4 = 0x%016" PRIx64, regs[4]);
3705 tty->print_cr(" r5 = 0x%016" PRIx64, regs[5]);
3706 tty->print_cr(" r6 = 0x%016" PRIx64, regs[6]);
3707 tty->print_cr(" r7 = 0x%016" PRIx64, regs[7]);
3708 tty->print_cr(" r8 = 0x%016" PRIx64, regs[8]);
3709 tty->print_cr(" r9 = 0x%016" PRIx64, regs[9]);
3710 tty->print_cr("r10 = 0x%016" PRIx64, regs[10]);
3711 tty->print_cr("r11 = 0x%016" PRIx64, regs[11]);
3712 tty->print_cr("r12 = 0x%016" PRIx64, regs[12]);
3713 tty->print_cr("r13 = 0x%016" PRIx64, regs[13]);
3714 tty->print_cr("r14 = 0x%016" PRIx64, regs[14]);
3715 tty->print_cr("r15 = 0x%016" PRIx64, regs[15]);
3716 tty->print_cr("r16 = 0x%016" PRIx64, regs[16]);
3717 tty->print_cr("r17 = 0x%016" PRIx64, regs[17]);
3718 tty->print_cr("r18 = 0x%016" PRIx64, regs[18]);
3719 tty->print_cr("r19 = 0x%016" PRIx64, regs[19]);
3720 tty->print_cr("r20 = 0x%016" PRIx64, regs[20]);
3721 tty->print_cr("r21 = 0x%016" PRIx64, regs[21]);
3722 tty->print_cr("r22 = 0x%016" PRIx64, regs[22]);
3723 tty->print_cr("r23 = 0x%016" PRIx64, regs[23]);
3724 tty->print_cr("r24 = 0x%016" PRIx64, regs[24]);
3725 tty->print_cr("r25 = 0x%016" PRIx64, regs[25]);
3726 tty->print_cr("r26 = 0x%016" PRIx64, regs[26]);
3727 tty->print_cr("r27 = 0x%016" PRIx64, regs[27]);
3728 tty->print_cr("r28 = 0x%016" PRIx64, regs[28]);
3729 tty->print_cr("r30 = 0x%016" PRIx64, regs[30]);
3730 tty->print_cr("r31 = 0x%016" PRIx64, regs[31]);
3731 BREAKPOINT;
3732 }
3733 }
3734 fatal("DEBUG MESSAGE: %s", msg);
3735 }
3736
3737 RegSet MacroAssembler::call_clobbered_gp_registers() {
3738 RegSet regs = RegSet::range(r0, r17) - RegSet::of(rscratch1, rscratch2);
3739 #ifndef R18_RESERVED
3740 regs += r18_tls;
3741 #endif
3742 return regs;
3743 }
3744
3745 void MacroAssembler::push_call_clobbered_registers_except(RegSet exclude) {
3746 int step = 4 * wordSize;
3747 push(call_clobbered_gp_registers() - exclude, sp);
3748 sub(sp, sp, step);
3749 mov(rscratch1, -step);
3750 // Push v0-v7, v16-v31.
3751 for (int i = 31; i>= 4; i -= 4) {
3752 if (i <= v7->encoding() || i >= v16->encoding())
3753 st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
3754 as_FloatRegister(i), T1D, Address(post(sp, rscratch1)));
3755 }
3756 st1(as_FloatRegister(0), as_FloatRegister(1), as_FloatRegister(2),
3757 as_FloatRegister(3), T1D, Address(sp));
3758 }
3759
3760 void MacroAssembler::pop_call_clobbered_registers_except(RegSet exclude) {
3761 for (int i = 0; i < 32; i += 4) {
3762 if (i <= v7->encoding() || i >= v16->encoding())
3763 ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
3764 as_FloatRegister(i+3), T1D, Address(post(sp, 4 * wordSize)));
3765 }
3766
3767 reinitialize_ptrue();
3768
3769 pop(call_clobbered_gp_registers() - exclude, sp);
3770 }
3771
3772 void MacroAssembler::push_CPU_state(bool save_vectors, bool use_sve,
3773 int sve_vector_size_in_bytes, int total_predicate_in_bytes) {
3774 push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
3775 if (save_vectors && use_sve && sve_vector_size_in_bytes > 16) {
3776 sub(sp, sp, sve_vector_size_in_bytes * FloatRegister::number_of_registers);
3777 for (int i = 0; i < FloatRegister::number_of_registers; i++) {
3778 sve_str(as_FloatRegister(i), Address(sp, i));
3779 }
3780 } else {
3781 int step = (save_vectors ? 8 : 4) * wordSize;
3782 mov(rscratch1, -step);
3783 sub(sp, sp, step);
3784 for (int i = 28; i >= 4; i -= 4) {
3785 st1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
3786 as_FloatRegister(i+3), save_vectors ? T2D : T1D, Address(post(sp, rscratch1)));
3787 }
3788 st1(v0, v1, v2, v3, save_vectors ? T2D : T1D, sp);
3789 }
3790 if (save_vectors && use_sve && total_predicate_in_bytes > 0) {
3791 sub(sp, sp, total_predicate_in_bytes);
3792 for (int i = 0; i < PRegister::number_of_registers; i++) {
3793 sve_str(as_PRegister(i), Address(sp, i));
3794 }
3795 }
3796 }
3797
3798 void MacroAssembler::pop_CPU_state(bool restore_vectors, bool use_sve,
3799 int sve_vector_size_in_bytes, int total_predicate_in_bytes) {
3800 if (restore_vectors && use_sve && total_predicate_in_bytes > 0) {
3801 for (int i = PRegister::number_of_registers - 1; i >= 0; i--) {
3802 sve_ldr(as_PRegister(i), Address(sp, i));
3803 }
3804 add(sp, sp, total_predicate_in_bytes);
3805 }
3806 if (restore_vectors && use_sve && sve_vector_size_in_bytes > 16) {
3807 for (int i = FloatRegister::number_of_registers - 1; i >= 0; i--) {
3808 sve_ldr(as_FloatRegister(i), Address(sp, i));
3809 }
3810 add(sp, sp, sve_vector_size_in_bytes * FloatRegister::number_of_registers);
3811 } else {
3812 int step = (restore_vectors ? 8 : 4) * wordSize;
3813 for (int i = 0; i <= 28; i += 4)
3814 ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
3815 as_FloatRegister(i+3), restore_vectors ? T2D : T1D, Address(post(sp, step)));
3816 }
3817
3818 // We may use predicate registers and rely on ptrue with SVE,
3819 // regardless of wide vector (> 8 bytes) used or not.
3820 if (use_sve) {
3821 reinitialize_ptrue();
3822 }
3823
3824 // integer registers except lr & sp
3825 pop(RegSet::range(r0, r17), sp);
3826 #ifdef R18_RESERVED
3827 ldp(zr, r19, Address(post(sp, 2 * wordSize)));
3828 pop(RegSet::range(r20, r29), sp);
3829 #else
3830 pop(RegSet::range(r18_tls, r29), sp);
3831 #endif
3832 }
3833
3834 /**
3835 * Helpers for multiply_to_len().
3836 */
3837 void MacroAssembler::add2_with_carry(Register final_dest_hi, Register dest_hi, Register dest_lo,
3838 Register src1, Register src2) {
3839 adds(dest_lo, dest_lo, src1);
3840 adc(dest_hi, dest_hi, zr);
3841 adds(dest_lo, dest_lo, src2);
3842 adc(final_dest_hi, dest_hi, zr);
3843 }
3844
3845 // Generate an address from (r + r1 extend offset). "size" is the
3846 // size of the operand. The result may be in rscratch2.
3847 Address MacroAssembler::offsetted_address(Register r, Register r1,
3848 Address::extend ext, int offset, int size) {
3849 if (offset || (ext.shift() % size != 0)) {
3850 lea(rscratch2, Address(r, r1, ext));
3851 return Address(rscratch2, offset);
3852 } else {
3853 return Address(r, r1, ext);
3854 }
3855 }
3856
3857 Address MacroAssembler::spill_address(int size, int offset, Register tmp)
3858 {
3859 assert(offset >= 0, "spill to negative address?");
3860 // Offset reachable ?
3861 // Not aligned - 9 bits signed offset
3862 // Aligned - 12 bits unsigned offset shifted
3863 Register base = sp;
3864 if ((offset & (size-1)) && offset >= (1<<8)) {
3865 add(tmp, base, offset & ((1<<12)-1));
3866 base = tmp;
3867 offset &= -1u<<12;
3868 }
3869
3870 if (offset >= (1<<12) * size) {
3871 add(tmp, base, offset & (((1<<12)-1)<<12));
3872 base = tmp;
3873 offset &= ~(((1<<12)-1)<<12);
3874 }
3875
3876 return Address(base, offset);
3877 }
3878
3879 Address MacroAssembler::sve_spill_address(int sve_reg_size_in_bytes, int offset, Register tmp) {
3880 assert(offset >= 0, "spill to negative address?");
3881
3882 Register base = sp;
3883
3884 // An immediate offset in the range 0 to 255 which is multiplied
3885 // by the current vector or predicate register size in bytes.
3886 if (offset % sve_reg_size_in_bytes == 0 && offset < ((1<<8)*sve_reg_size_in_bytes)) {
3887 return Address(base, offset / sve_reg_size_in_bytes);
3888 }
3889
3890 add(tmp, base, offset);
3891 return Address(tmp);
3892 }
3893
3894 // Checks whether offset is aligned.
3895 // Returns true if it is, else false.
3896 bool MacroAssembler::merge_alignment_check(Register base,
3897 size_t size,
3898 int64_t cur_offset,
3899 int64_t prev_offset) const {
3900 if (AvoidUnalignedAccesses) {
3901 if (base == sp) {
3902 // Checks whether low offset if aligned to pair of registers.
3903 int64_t pair_mask = size * 2 - 1;
3904 int64_t offset = prev_offset > cur_offset ? cur_offset : prev_offset;
3905 return (offset & pair_mask) == 0;
3906 } else { // If base is not sp, we can't guarantee the access is aligned.
3907 return false;
3908 }
3909 } else {
3910 int64_t mask = size - 1;
3911 // Load/store pair instruction only supports element size aligned offset.
3912 return (cur_offset & mask) == 0 && (prev_offset & mask) == 0;
3913 }
3914 }
3915
3916 // Checks whether current and previous loads/stores can be merged.
3917 // Returns true if it can be merged, else false.
3918 bool MacroAssembler::ldst_can_merge(Register rt,
3919 const Address &adr,
3920 size_t cur_size_in_bytes,
3921 bool is_store) const {
3922 address prev = pc() - NativeInstruction::instruction_size;
3923 address last = code()->last_insn();
3924
3925 if (last == nullptr || !nativeInstruction_at(last)->is_Imm_LdSt()) {
3926 return false;
3927 }
3928
3929 if (adr.getMode() != Address::base_plus_offset || prev != last) {
3930 return false;
3931 }
3932
3933 NativeLdSt* prev_ldst = NativeLdSt_at(prev);
3934 size_t prev_size_in_bytes = prev_ldst->size_in_bytes();
3935
3936 assert(prev_size_in_bytes == 4 || prev_size_in_bytes == 8, "only supports 64/32bit merging.");
3937 assert(cur_size_in_bytes == 4 || cur_size_in_bytes == 8, "only supports 64/32bit merging.");
3938
3939 if (cur_size_in_bytes != prev_size_in_bytes || is_store != prev_ldst->is_store()) {
3940 return false;
3941 }
3942
3943 int64_t max_offset = 63 * prev_size_in_bytes;
3944 int64_t min_offset = -64 * prev_size_in_bytes;
3945
3946 assert(prev_ldst->is_not_pre_post_index(), "pre-index or post-index is not supported to be merged.");
3947
3948 // Only same base can be merged.
3949 if (adr.base() != prev_ldst->base()) {
3950 return false;
3951 }
3952
3953 int64_t cur_offset = adr.offset();
3954 int64_t prev_offset = prev_ldst->offset();
3955 size_t diff = abs(cur_offset - prev_offset);
3956 if (diff != prev_size_in_bytes) {
3957 return false;
3958 }
3959
3960 // Following cases can not be merged:
3961 // ldr x2, [x2, #8]
3962 // ldr x3, [x2, #16]
3963 // or:
3964 // ldr x2, [x3, #8]
3965 // ldr x2, [x3, #16]
3966 // If t1 and t2 is the same in "ldp t1, t2, [xn, #imm]", we'll get SIGILL.
3967 if (!is_store && (adr.base() == prev_ldst->target() || rt == prev_ldst->target())) {
3968 return false;
3969 }
3970
3971 int64_t low_offset = prev_offset > cur_offset ? cur_offset : prev_offset;
3972 // Offset range must be in ldp/stp instruction's range.
3973 if (low_offset > max_offset || low_offset < min_offset) {
3974 return false;
3975 }
3976
3977 if (merge_alignment_check(adr.base(), prev_size_in_bytes, cur_offset, prev_offset)) {
3978 return true;
3979 }
3980
3981 return false;
3982 }
3983
3984 // Merge current load/store with previous load/store into ldp/stp.
3985 void MacroAssembler::merge_ldst(Register rt,
3986 const Address &adr,
3987 size_t cur_size_in_bytes,
3988 bool is_store) {
3989
3990 assert(ldst_can_merge(rt, adr, cur_size_in_bytes, is_store) == true, "cur and prev must be able to be merged.");
3991
3992 Register rt_low, rt_high;
3993 address prev = pc() - NativeInstruction::instruction_size;
3994 NativeLdSt* prev_ldst = NativeLdSt_at(prev);
3995
3996 int64_t offset;
3997
3998 if (adr.offset() < prev_ldst->offset()) {
3999 offset = adr.offset();
4000 rt_low = rt;
4001 rt_high = prev_ldst->target();
4002 } else {
4003 offset = prev_ldst->offset();
4004 rt_low = prev_ldst->target();
4005 rt_high = rt;
4006 }
4007
4008 Address adr_p = Address(prev_ldst->base(), offset);
4009 // Overwrite previous generated binary.
4010 code_section()->set_end(prev);
4011
4012 const size_t sz = prev_ldst->size_in_bytes();
4013 assert(sz == 8 || sz == 4, "only supports 64/32bit merging.");
4014 if (!is_store) {
4015 BLOCK_COMMENT("merged ldr pair");
4016 if (sz == 8) {
4017 ldp(rt_low, rt_high, adr_p);
4018 } else {
4019 ldpw(rt_low, rt_high, adr_p);
4020 }
4021 } else {
4022 BLOCK_COMMENT("merged str pair");
4023 if (sz == 8) {
4024 stp(rt_low, rt_high, adr_p);
4025 } else {
4026 stpw(rt_low, rt_high, adr_p);
4027 }
4028 }
4029 }
4030
4031 /**
4032 * Multiply 64 bit by 64 bit first loop.
4033 */
4034 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart,
4035 Register y, Register y_idx, Register z,
4036 Register carry, Register product,
4037 Register idx, Register kdx) {
4038 //
4039 // jlong carry, x[], y[], z[];
4040 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) {
4041 // huge_128 product = y[idx] * x[xstart] + carry;
4042 // z[kdx] = (jlong)product;
4043 // carry = (jlong)(product >>> 64);
4044 // }
4045 // z[xstart] = carry;
4046 //
4047
4048 Label L_first_loop, L_first_loop_exit;
4049 Label L_one_x, L_one_y, L_multiply;
4050
4051 subsw(xstart, xstart, 1);
4052 br(Assembler::MI, L_one_x);
4053
4054 lea(rscratch1, Address(x, xstart, Address::lsl(LogBytesPerInt)));
4055 ldr(x_xstart, Address(rscratch1));
4056 ror(x_xstart, x_xstart, 32); // convert big-endian to little-endian
4057
4058 bind(L_first_loop);
4059 subsw(idx, idx, 1);
4060 br(Assembler::MI, L_first_loop_exit);
4061 subsw(idx, idx, 1);
4062 br(Assembler::MI, L_one_y);
4063 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt)));
4064 ldr(y_idx, Address(rscratch1));
4065 ror(y_idx, y_idx, 32); // convert big-endian to little-endian
4066 bind(L_multiply);
4067
4068 // AArch64 has a multiply-accumulate instruction that we can't use
4069 // here because it has no way to process carries, so we have to use
4070 // separate add and adc instructions. Bah.
4071 umulh(rscratch1, x_xstart, y_idx); // x_xstart * y_idx -> rscratch1:product
4072 mul(product, x_xstart, y_idx);
4073 adds(product, product, carry);
4074 adc(carry, rscratch1, zr); // x_xstart * y_idx + carry -> carry:product
4075
4076 subw(kdx, kdx, 2);
4077 ror(product, product, 32); // back to big-endian
4078 str(product, offsetted_address(z, kdx, Address::uxtw(LogBytesPerInt), 0, BytesPerLong));
4079
4080 b(L_first_loop);
4081
4082 bind(L_one_y);
4083 ldrw(y_idx, Address(y, 0));
4084 b(L_multiply);
4085
4086 bind(L_one_x);
4087 ldrw(x_xstart, Address(x, 0));
4088 b(L_first_loop);
4089
4090 bind(L_first_loop_exit);
4091 }
4092
4093 /**
4094 * Multiply 128 bit by 128. Unrolled inner loop.
4095 *
4096 */
4097 void MacroAssembler::multiply_128_x_128_loop(Register y, Register z,
4098 Register carry, Register carry2,
4099 Register idx, Register jdx,
4100 Register yz_idx1, Register yz_idx2,
4101 Register tmp, Register tmp3, Register tmp4,
4102 Register tmp6, Register product_hi) {
4103
4104 // jlong carry, x[], y[], z[];
4105 // int kdx = ystart+1;
4106 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop
4107 // huge_128 tmp3 = (y[idx+1] * product_hi) + z[kdx+idx+1] + carry;
4108 // jlong carry2 = (jlong)(tmp3 >>> 64);
4109 // huge_128 tmp4 = (y[idx] * product_hi) + z[kdx+idx] + carry2;
4110 // carry = (jlong)(tmp4 >>> 64);
4111 // z[kdx+idx+1] = (jlong)tmp3;
4112 // z[kdx+idx] = (jlong)tmp4;
4113 // }
4114 // idx += 2;
4115 // if (idx > 0) {
4116 // yz_idx1 = (y[idx] * product_hi) + z[kdx+idx] + carry;
4117 // z[kdx+idx] = (jlong)yz_idx1;
4118 // carry = (jlong)(yz_idx1 >>> 64);
4119 // }
4120 //
4121
4122 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done;
4123
4124 lsrw(jdx, idx, 2);
4125
4126 bind(L_third_loop);
4127
4128 subsw(jdx, jdx, 1);
4129 br(Assembler::MI, L_third_loop_exit);
4130 subw(idx, idx, 4);
4131
4132 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt)));
4133
4134 ldp(yz_idx2, yz_idx1, Address(rscratch1, 0));
4135
4136 lea(tmp6, Address(z, idx, Address::uxtw(LogBytesPerInt)));
4137
4138 ror(yz_idx1, yz_idx1, 32); // convert big-endian to little-endian
4139 ror(yz_idx2, yz_idx2, 32);
4140
4141 ldp(rscratch2, rscratch1, Address(tmp6, 0));
4142
4143 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3
4144 umulh(tmp4, product_hi, yz_idx1);
4145
4146 ror(rscratch1, rscratch1, 32); // convert big-endian to little-endian
4147 ror(rscratch2, rscratch2, 32);
4148
4149 mul(tmp, product_hi, yz_idx2); // yz_idx2 * product_hi -> carry2:tmp
4150 umulh(carry2, product_hi, yz_idx2);
4151
4152 // propagate sum of both multiplications into carry:tmp4:tmp3
4153 adds(tmp3, tmp3, carry);
4154 adc(tmp4, tmp4, zr);
4155 adds(tmp3, tmp3, rscratch1);
4156 adcs(tmp4, tmp4, tmp);
4157 adc(carry, carry2, zr);
4158 adds(tmp4, tmp4, rscratch2);
4159 adc(carry, carry, zr);
4160
4161 ror(tmp3, tmp3, 32); // convert little-endian to big-endian
4162 ror(tmp4, tmp4, 32);
4163 stp(tmp4, tmp3, Address(tmp6, 0));
4164
4165 b(L_third_loop);
4166 bind (L_third_loop_exit);
4167
4168 andw (idx, idx, 0x3);
4169 cbz(idx, L_post_third_loop_done);
4170
4171 Label L_check_1;
4172 subsw(idx, idx, 2);
4173 br(Assembler::MI, L_check_1);
4174
4175 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt)));
4176 ldr(yz_idx1, Address(rscratch1, 0));
4177 ror(yz_idx1, yz_idx1, 32);
4178 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3
4179 umulh(tmp4, product_hi, yz_idx1);
4180 lea(rscratch1, Address(z, idx, Address::uxtw(LogBytesPerInt)));
4181 ldr(yz_idx2, Address(rscratch1, 0));
4182 ror(yz_idx2, yz_idx2, 32);
4183
4184 add2_with_carry(carry, tmp4, tmp3, carry, yz_idx2);
4185
4186 ror(tmp3, tmp3, 32);
4187 str(tmp3, Address(rscratch1, 0));
4188
4189 bind (L_check_1);
4190
4191 andw (idx, idx, 0x1);
4192 subsw(idx, idx, 1);
4193 br(Assembler::MI, L_post_third_loop_done);
4194 ldrw(tmp4, Address(y, idx, Address::uxtw(LogBytesPerInt)));
4195 mul(tmp3, tmp4, product_hi); // tmp4 * product_hi -> carry2:tmp3
4196 umulh(carry2, tmp4, product_hi);
4197 ldrw(tmp4, Address(z, idx, Address::uxtw(LogBytesPerInt)));
4198
4199 add2_with_carry(carry2, tmp3, tmp4, carry);
4200
4201 strw(tmp3, Address(z, idx, Address::uxtw(LogBytesPerInt)));
4202 extr(carry, carry2, tmp3, 32);
4203
4204 bind(L_post_third_loop_done);
4205 }
4206
4207 /**
4208 * Code for BigInteger::multiplyToLen() intrinsic.
4209 *
4210 * r0: x
4211 * r1: xlen
4212 * r2: y
4213 * r3: ylen
4214 * r4: z
4215 * r5: tmp0
4216 * r10: tmp1
4217 * r11: tmp2
4218 * r12: tmp3
4219 * r13: tmp4
4220 * r14: tmp5
4221 * r15: tmp6
4222 * r16: tmp7
4223 *
4224 */
4225 void MacroAssembler::multiply_to_len(Register x, Register xlen, Register y, Register ylen,
4226 Register z, Register tmp0,
4227 Register tmp1, Register tmp2, Register tmp3, Register tmp4,
4228 Register tmp5, Register tmp6, Register product_hi) {
4229
4230 assert_different_registers(x, xlen, y, ylen, z, tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, product_hi);
4231
4232 const Register idx = tmp1;
4233 const Register kdx = tmp2;
4234 const Register xstart = tmp3;
4235
4236 const Register y_idx = tmp4;
4237 const Register carry = tmp5;
4238 const Register product = xlen;
4239 const Register x_xstart = tmp0;
4240
4241 // First Loop.
4242 //
4243 // final static long LONG_MASK = 0xffffffffL;
4244 // int xstart = xlen - 1;
4245 // int ystart = ylen - 1;
4246 // long carry = 0;
4247 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) {
4248 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry;
4249 // z[kdx] = (int)product;
4250 // carry = product >>> 32;
4251 // }
4252 // z[xstart] = (int)carry;
4253 //
4254
4255 movw(idx, ylen); // idx = ylen;
4256 addw(kdx, xlen, ylen); // kdx = xlen+ylen;
4257 mov(carry, zr); // carry = 0;
4258
4259 Label L_done;
4260
4261 movw(xstart, xlen);
4262 subsw(xstart, xstart, 1);
4263 br(Assembler::MI, L_done);
4264
4265 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx);
4266
4267 Label L_second_loop;
4268 cbzw(kdx, L_second_loop);
4269
4270 Label L_carry;
4271 subw(kdx, kdx, 1);
4272 cbzw(kdx, L_carry);
4273
4274 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt)));
4275 lsr(carry, carry, 32);
4276 subw(kdx, kdx, 1);
4277
4278 bind(L_carry);
4279 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt)));
4280
4281 // Second and third (nested) loops.
4282 //
4283 // for (int i = xstart-1; i >= 0; i--) { // Second loop
4284 // carry = 0;
4285 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop
4286 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) +
4287 // (z[k] & LONG_MASK) + carry;
4288 // z[k] = (int)product;
4289 // carry = product >>> 32;
4290 // }
4291 // z[i] = (int)carry;
4292 // }
4293 //
4294 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = product_hi
4295
4296 const Register jdx = tmp1;
4297
4298 bind(L_second_loop);
4299 mov(carry, zr); // carry = 0;
4300 movw(jdx, ylen); // j = ystart+1
4301
4302 subsw(xstart, xstart, 1); // i = xstart-1;
4303 br(Assembler::MI, L_done);
4304
4305 str(z, Address(pre(sp, -4 * wordSize)));
4306
4307 Label L_last_x;
4308 lea(z, offsetted_address(z, xstart, Address::uxtw(LogBytesPerInt), 4, BytesPerInt)); // z = z + k - j
4309 subsw(xstart, xstart, 1); // i = xstart-1;
4310 br(Assembler::MI, L_last_x);
4311
4312 lea(rscratch1, Address(x, xstart, Address::uxtw(LogBytesPerInt)));
4313 ldr(product_hi, Address(rscratch1));
4314 ror(product_hi, product_hi, 32); // convert big-endian to little-endian
4315
4316 Label L_third_loop_prologue;
4317 bind(L_third_loop_prologue);
4318
4319 str(ylen, Address(sp, wordSize));
4320 stp(x, xstart, Address(sp, 2 * wordSize));
4321 multiply_128_x_128_loop(y, z, carry, x, jdx, ylen, product,
4322 tmp2, x_xstart, tmp3, tmp4, tmp6, product_hi);
4323 ldp(z, ylen, Address(post(sp, 2 * wordSize)));
4324 ldp(x, xlen, Address(post(sp, 2 * wordSize))); // copy old xstart -> xlen
4325
4326 addw(tmp3, xlen, 1);
4327 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt)));
4328 subsw(tmp3, tmp3, 1);
4329 br(Assembler::MI, L_done);
4330
4331 lsr(carry, carry, 32);
4332 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt)));
4333 b(L_second_loop);
4334
4335 // Next infrequent code is moved outside loops.
4336 bind(L_last_x);
4337 ldrw(product_hi, Address(x, 0));
4338 b(L_third_loop_prologue);
4339
4340 bind(L_done);
4341 }
4342
4343 // Code for BigInteger::mulAdd intrinsic
4344 // out = r0
4345 // in = r1
4346 // offset = r2 (already out.length-offset)
4347 // len = r3
4348 // k = r4
4349 //
4350 // pseudo code from java implementation:
4351 // carry = 0;
4352 // offset = out.length-offset - 1;
4353 // for (int j=len-1; j >= 0; j--) {
4354 // product = (in[j] & LONG_MASK) * kLong + (out[offset] & LONG_MASK) + carry;
4355 // out[offset--] = (int)product;
4356 // carry = product >>> 32;
4357 // }
4358 // return (int)carry;
4359 void MacroAssembler::mul_add(Register out, Register in, Register offset,
4360 Register len, Register k) {
4361 Label LOOP, END;
4362 // pre-loop
4363 cmp(len, zr); // cmp, not cbz/cbnz: to use condition twice => less branches
4364 csel(out, zr, out, Assembler::EQ);
4365 br(Assembler::EQ, END);
4366 add(in, in, len, LSL, 2); // in[j+1] address
4367 add(offset, out, offset, LSL, 2); // out[offset + 1] address
4368 mov(out, zr); // used to keep carry now
4369 BIND(LOOP);
4370 ldrw(rscratch1, Address(pre(in, -4)));
4371 madd(rscratch1, rscratch1, k, out);
4372 ldrw(rscratch2, Address(pre(offset, -4)));
4373 add(rscratch1, rscratch1, rscratch2);
4374 strw(rscratch1, Address(offset));
4375 lsr(out, rscratch1, 32);
4376 subs(len, len, 1);
4377 br(Assembler::NE, LOOP);
4378 BIND(END);
4379 }
4380
4381 /**
4382 * Emits code to update CRC-32 with a byte value according to constants in table
4383 *
4384 * @param [in,out]crc Register containing the crc.
4385 * @param [in]val Register containing the byte to fold into the CRC.
4386 * @param [in]table Register containing the table of crc constants.
4387 *
4388 * uint32_t crc;
4389 * val = crc_table[(val ^ crc) & 0xFF];
4390 * crc = val ^ (crc >> 8);
4391 *
4392 */
4393 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) {
4394 eor(val, val, crc);
4395 andr(val, val, 0xff);
4396 ldrw(val, Address(table, val, Address::lsl(2)));
4397 eor(crc, val, crc, Assembler::LSR, 8);
4398 }
4399
4400 /**
4401 * Emits code to update CRC-32 with a 32-bit value according to tables 0 to 3
4402 *
4403 * @param [in,out]crc Register containing the crc.
4404 * @param [in]v Register containing the 32-bit to fold into the CRC.
4405 * @param [in]table0 Register containing table 0 of crc constants.
4406 * @param [in]table1 Register containing table 1 of crc constants.
4407 * @param [in]table2 Register containing table 2 of crc constants.
4408 * @param [in]table3 Register containing table 3 of crc constants.
4409 *
4410 * uint32_t crc;
4411 * v = crc ^ v
4412 * crc = table3[v&0xff]^table2[(v>>8)&0xff]^table1[(v>>16)&0xff]^table0[v>>24]
4413 *
4414 */
4415 void MacroAssembler::update_word_crc32(Register crc, Register v, Register tmp,
4416 Register table0, Register table1, Register table2, Register table3,
4417 bool upper) {
4418 eor(v, crc, v, upper ? LSR:LSL, upper ? 32:0);
4419 uxtb(tmp, v);
4420 ldrw(crc, Address(table3, tmp, Address::lsl(2)));
4421 ubfx(tmp, v, 8, 8);
4422 ldrw(tmp, Address(table2, tmp, Address::lsl(2)));
4423 eor(crc, crc, tmp);
4424 ubfx(tmp, v, 16, 8);
4425 ldrw(tmp, Address(table1, tmp, Address::lsl(2)));
4426 eor(crc, crc, tmp);
4427 ubfx(tmp, v, 24, 8);
4428 ldrw(tmp, Address(table0, tmp, Address::lsl(2)));
4429 eor(crc, crc, tmp);
4430 }
4431
4432 void MacroAssembler::kernel_crc32_using_crypto_pmull(Register crc, Register buf,
4433 Register len, Register tmp0, Register tmp1, Register tmp2, Register tmp3) {
4434 Label CRC_by4_loop, CRC_by1_loop, CRC_less128, CRC_by128_pre, CRC_by32_loop, CRC_less32, L_exit;
4435 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2);
4436
4437 subs(tmp0, len, 384);
4438 mvnw(crc, crc);
4439 br(Assembler::GE, CRC_by128_pre);
4440 BIND(CRC_less128);
4441 subs(len, len, 32);
4442 br(Assembler::GE, CRC_by32_loop);
4443 BIND(CRC_less32);
4444 adds(len, len, 32 - 4);
4445 br(Assembler::GE, CRC_by4_loop);
4446 adds(len, len, 4);
4447 br(Assembler::GT, CRC_by1_loop);
4448 b(L_exit);
4449
4450 BIND(CRC_by32_loop);
4451 ldp(tmp0, tmp1, Address(buf));
4452 crc32x(crc, crc, tmp0);
4453 ldp(tmp2, tmp3, Address(buf, 16));
4454 crc32x(crc, crc, tmp1);
4455 add(buf, buf, 32);
4456 crc32x(crc, crc, tmp2);
4457 subs(len, len, 32);
4458 crc32x(crc, crc, tmp3);
4459 br(Assembler::GE, CRC_by32_loop);
4460 cmn(len, (u1)32);
4461 br(Assembler::NE, CRC_less32);
4462 b(L_exit);
4463
4464 BIND(CRC_by4_loop);
4465 ldrw(tmp0, Address(post(buf, 4)));
4466 subs(len, len, 4);
4467 crc32w(crc, crc, tmp0);
4468 br(Assembler::GE, CRC_by4_loop);
4469 adds(len, len, 4);
4470 br(Assembler::LE, L_exit);
4471 BIND(CRC_by1_loop);
4472 ldrb(tmp0, Address(post(buf, 1)));
4473 subs(len, len, 1);
4474 crc32b(crc, crc, tmp0);
4475 br(Assembler::GT, CRC_by1_loop);
4476 b(L_exit);
4477
4478 BIND(CRC_by128_pre);
4479 kernel_crc32_common_fold_using_crypto_pmull(crc, buf, len, tmp0, tmp1, tmp2,
4480 4*256*sizeof(juint) + 8*sizeof(juint));
4481 mov(crc, 0);
4482 crc32x(crc, crc, tmp0);
4483 crc32x(crc, crc, tmp1);
4484
4485 cbnz(len, CRC_less128);
4486
4487 BIND(L_exit);
4488 mvnw(crc, crc);
4489 }
4490
4491 void MacroAssembler::kernel_crc32_using_crc32(Register crc, Register buf,
4492 Register len, Register tmp0, Register tmp1, Register tmp2,
4493 Register tmp3) {
4494 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop, CRC_less64, CRC_by64_pre, CRC_by32_loop, CRC_less32, L_exit;
4495 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2, tmp3);
4496
4497 mvnw(crc, crc);
4498
4499 subs(len, len, 128);
4500 br(Assembler::GE, CRC_by64_pre);
4501 BIND(CRC_less64);
4502 adds(len, len, 128-32);
4503 br(Assembler::GE, CRC_by32_loop);
4504 BIND(CRC_less32);
4505 adds(len, len, 32-4);
4506 br(Assembler::GE, CRC_by4_loop);
4507 adds(len, len, 4);
4508 br(Assembler::GT, CRC_by1_loop);
4509 b(L_exit);
4510
4511 BIND(CRC_by32_loop);
4512 ldp(tmp0, tmp1, Address(post(buf, 16)));
4513 subs(len, len, 32);
4514 crc32x(crc, crc, tmp0);
4515 ldr(tmp2, Address(post(buf, 8)));
4516 crc32x(crc, crc, tmp1);
4517 ldr(tmp3, Address(post(buf, 8)));
4518 crc32x(crc, crc, tmp2);
4519 crc32x(crc, crc, tmp3);
4520 br(Assembler::GE, CRC_by32_loop);
4521 cmn(len, (u1)32);
4522 br(Assembler::NE, CRC_less32);
4523 b(L_exit);
4524
4525 BIND(CRC_by4_loop);
4526 ldrw(tmp0, Address(post(buf, 4)));
4527 subs(len, len, 4);
4528 crc32w(crc, crc, tmp0);
4529 br(Assembler::GE, CRC_by4_loop);
4530 adds(len, len, 4);
4531 br(Assembler::LE, L_exit);
4532 BIND(CRC_by1_loop);
4533 ldrb(tmp0, Address(post(buf, 1)));
4534 subs(len, len, 1);
4535 crc32b(crc, crc, tmp0);
4536 br(Assembler::GT, CRC_by1_loop);
4537 b(L_exit);
4538
4539 BIND(CRC_by64_pre);
4540 sub(buf, buf, 8);
4541 ldp(tmp0, tmp1, Address(buf, 8));
4542 crc32x(crc, crc, tmp0);
4543 ldr(tmp2, Address(buf, 24));
4544 crc32x(crc, crc, tmp1);
4545 ldr(tmp3, Address(buf, 32));
4546 crc32x(crc, crc, tmp2);
4547 ldr(tmp0, Address(buf, 40));
4548 crc32x(crc, crc, tmp3);
4549 ldr(tmp1, Address(buf, 48));
4550 crc32x(crc, crc, tmp0);
4551 ldr(tmp2, Address(buf, 56));
4552 crc32x(crc, crc, tmp1);
4553 ldr(tmp3, Address(pre(buf, 64)));
4554
4555 b(CRC_by64_loop);
4556
4557 align(CodeEntryAlignment);
4558 BIND(CRC_by64_loop);
4559 subs(len, len, 64);
4560 crc32x(crc, crc, tmp2);
4561 ldr(tmp0, Address(buf, 8));
4562 crc32x(crc, crc, tmp3);
4563 ldr(tmp1, Address(buf, 16));
4564 crc32x(crc, crc, tmp0);
4565 ldr(tmp2, Address(buf, 24));
4566 crc32x(crc, crc, tmp1);
4567 ldr(tmp3, Address(buf, 32));
4568 crc32x(crc, crc, tmp2);
4569 ldr(tmp0, Address(buf, 40));
4570 crc32x(crc, crc, tmp3);
4571 ldr(tmp1, Address(buf, 48));
4572 crc32x(crc, crc, tmp0);
4573 ldr(tmp2, Address(buf, 56));
4574 crc32x(crc, crc, tmp1);
4575 ldr(tmp3, Address(pre(buf, 64)));
4576 br(Assembler::GE, CRC_by64_loop);
4577
4578 // post-loop
4579 crc32x(crc, crc, tmp2);
4580 crc32x(crc, crc, tmp3);
4581
4582 sub(len, len, 64);
4583 add(buf, buf, 8);
4584 cmn(len, (u1)128);
4585 br(Assembler::NE, CRC_less64);
4586 BIND(L_exit);
4587 mvnw(crc, crc);
4588 }
4589
4590 /**
4591 * @param crc register containing existing CRC (32-bit)
4592 * @param buf register pointing to input byte buffer (byte*)
4593 * @param len register containing number of bytes
4594 * @param table register that will contain address of CRC table
4595 * @param tmp scratch register
4596 */
4597 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len,
4598 Register table0, Register table1, Register table2, Register table3,
4599 Register tmp, Register tmp2, Register tmp3) {
4600 Label L_by16, L_by16_loop, L_by4, L_by4_loop, L_by1, L_by1_loop, L_exit;
4601
4602 if (UseCryptoPmullForCRC32) {
4603 kernel_crc32_using_crypto_pmull(crc, buf, len, table0, table1, table2, table3);
4604 return;
4605 }
4606
4607 if (UseCRC32) {
4608 kernel_crc32_using_crc32(crc, buf, len, table0, table1, table2, table3);
4609 return;
4610 }
4611
4612 mvnw(crc, crc);
4613
4614 {
4615 uint64_t offset;
4616 adrp(table0, ExternalAddress(StubRoutines::crc_table_addr()), offset);
4617 add(table0, table0, offset);
4618 }
4619 add(table1, table0, 1*256*sizeof(juint));
4620 add(table2, table0, 2*256*sizeof(juint));
4621 add(table3, table0, 3*256*sizeof(juint));
4622
4623 { // Neon code start
4624 cmp(len, (u1)64);
4625 br(Assembler::LT, L_by16);
4626 eor(v16, T16B, v16, v16);
4627
4628 Label L_fold;
4629
4630 add(tmp, table0, 4*256*sizeof(juint)); // Point at the Neon constants
4631
4632 ld1(v0, v1, T2D, post(buf, 32));
4633 ld1r(v4, T2D, post(tmp, 8));
4634 ld1r(v5, T2D, post(tmp, 8));
4635 ld1r(v6, T2D, post(tmp, 8));
4636 ld1r(v7, T2D, post(tmp, 8));
4637 mov(v16, S, 0, crc);
4638
4639 eor(v0, T16B, v0, v16);
4640 sub(len, len, 64);
4641
4642 BIND(L_fold);
4643 pmull(v22, T8H, v0, v5, T8B);
4644 pmull(v20, T8H, v0, v7, T8B);
4645 pmull(v23, T8H, v0, v4, T8B);
4646 pmull(v21, T8H, v0, v6, T8B);
4647
4648 pmull2(v18, T8H, v0, v5, T16B);
4649 pmull2(v16, T8H, v0, v7, T16B);
4650 pmull2(v19, T8H, v0, v4, T16B);
4651 pmull2(v17, T8H, v0, v6, T16B);
4652
4653 uzp1(v24, T8H, v20, v22);
4654 uzp2(v25, T8H, v20, v22);
4655 eor(v20, T16B, v24, v25);
4656
4657 uzp1(v26, T8H, v16, v18);
4658 uzp2(v27, T8H, v16, v18);
4659 eor(v16, T16B, v26, v27);
4660
4661 ushll2(v22, T4S, v20, T8H, 8);
4662 ushll(v20, T4S, v20, T4H, 8);
4663
4664 ushll2(v18, T4S, v16, T8H, 8);
4665 ushll(v16, T4S, v16, T4H, 8);
4666
4667 eor(v22, T16B, v23, v22);
4668 eor(v18, T16B, v19, v18);
4669 eor(v20, T16B, v21, v20);
4670 eor(v16, T16B, v17, v16);
4671
4672 uzp1(v17, T2D, v16, v20);
4673 uzp2(v21, T2D, v16, v20);
4674 eor(v17, T16B, v17, v21);
4675
4676 ushll2(v20, T2D, v17, T4S, 16);
4677 ushll(v16, T2D, v17, T2S, 16);
4678
4679 eor(v20, T16B, v20, v22);
4680 eor(v16, T16B, v16, v18);
4681
4682 uzp1(v17, T2D, v20, v16);
4683 uzp2(v21, T2D, v20, v16);
4684 eor(v28, T16B, v17, v21);
4685
4686 pmull(v22, T8H, v1, v5, T8B);
4687 pmull(v20, T8H, v1, v7, T8B);
4688 pmull(v23, T8H, v1, v4, T8B);
4689 pmull(v21, T8H, v1, v6, T8B);
4690
4691 pmull2(v18, T8H, v1, v5, T16B);
4692 pmull2(v16, T8H, v1, v7, T16B);
4693 pmull2(v19, T8H, v1, v4, T16B);
4694 pmull2(v17, T8H, v1, v6, T16B);
4695
4696 ld1(v0, v1, T2D, post(buf, 32));
4697
4698 uzp1(v24, T8H, v20, v22);
4699 uzp2(v25, T8H, v20, v22);
4700 eor(v20, T16B, v24, v25);
4701
4702 uzp1(v26, T8H, v16, v18);
4703 uzp2(v27, T8H, v16, v18);
4704 eor(v16, T16B, v26, v27);
4705
4706 ushll2(v22, T4S, v20, T8H, 8);
4707 ushll(v20, T4S, v20, T4H, 8);
4708
4709 ushll2(v18, T4S, v16, T8H, 8);
4710 ushll(v16, T4S, v16, T4H, 8);
4711
4712 eor(v22, T16B, v23, v22);
4713 eor(v18, T16B, v19, v18);
4714 eor(v20, T16B, v21, v20);
4715 eor(v16, T16B, v17, v16);
4716
4717 uzp1(v17, T2D, v16, v20);
4718 uzp2(v21, T2D, v16, v20);
4719 eor(v16, T16B, v17, v21);
4720
4721 ushll2(v20, T2D, v16, T4S, 16);
4722 ushll(v16, T2D, v16, T2S, 16);
4723
4724 eor(v20, T16B, v22, v20);
4725 eor(v16, T16B, v16, v18);
4726
4727 uzp1(v17, T2D, v20, v16);
4728 uzp2(v21, T2D, v20, v16);
4729 eor(v20, T16B, v17, v21);
4730
4731 shl(v16, T2D, v28, 1);
4732 shl(v17, T2D, v20, 1);
4733
4734 eor(v0, T16B, v0, v16);
4735 eor(v1, T16B, v1, v17);
4736
4737 subs(len, len, 32);
4738 br(Assembler::GE, L_fold);
4739
4740 mov(crc, 0);
4741 mov(tmp, v0, D, 0);
4742 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
4743 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
4744 mov(tmp, v0, D, 1);
4745 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
4746 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
4747 mov(tmp, v1, D, 0);
4748 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
4749 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
4750 mov(tmp, v1, D, 1);
4751 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
4752 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
4753
4754 add(len, len, 32);
4755 } // Neon code end
4756
4757 BIND(L_by16);
4758 subs(len, len, 16);
4759 br(Assembler::GE, L_by16_loop);
4760 adds(len, len, 16-4);
4761 br(Assembler::GE, L_by4_loop);
4762 adds(len, len, 4);
4763 br(Assembler::GT, L_by1_loop);
4764 b(L_exit);
4765
4766 BIND(L_by4_loop);
4767 ldrw(tmp, Address(post(buf, 4)));
4768 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3);
4769 subs(len, len, 4);
4770 br(Assembler::GE, L_by4_loop);
4771 adds(len, len, 4);
4772 br(Assembler::LE, L_exit);
4773 BIND(L_by1_loop);
4774 subs(len, len, 1);
4775 ldrb(tmp, Address(post(buf, 1)));
4776 update_byte_crc32(crc, tmp, table0);
4777 br(Assembler::GT, L_by1_loop);
4778 b(L_exit);
4779
4780 align(CodeEntryAlignment);
4781 BIND(L_by16_loop);
4782 subs(len, len, 16);
4783 ldp(tmp, tmp3, Address(post(buf, 16)));
4784 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
4785 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
4786 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, false);
4787 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, true);
4788 br(Assembler::GE, L_by16_loop);
4789 adds(len, len, 16-4);
4790 br(Assembler::GE, L_by4_loop);
4791 adds(len, len, 4);
4792 br(Assembler::GT, L_by1_loop);
4793 BIND(L_exit);
4794 mvnw(crc, crc);
4795 }
4796
4797 void MacroAssembler::kernel_crc32c_using_crypto_pmull(Register crc, Register buf,
4798 Register len, Register tmp0, Register tmp1, Register tmp2, Register tmp3) {
4799 Label CRC_by4_loop, CRC_by1_loop, CRC_less128, CRC_by128_pre, CRC_by32_loop, CRC_less32, L_exit;
4800 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2);
4801
4802 subs(tmp0, len, 384);
4803 br(Assembler::GE, CRC_by128_pre);
4804 BIND(CRC_less128);
4805 subs(len, len, 32);
4806 br(Assembler::GE, CRC_by32_loop);
4807 BIND(CRC_less32);
4808 adds(len, len, 32 - 4);
4809 br(Assembler::GE, CRC_by4_loop);
4810 adds(len, len, 4);
4811 br(Assembler::GT, CRC_by1_loop);
4812 b(L_exit);
4813
4814 BIND(CRC_by32_loop);
4815 ldp(tmp0, tmp1, Address(buf));
4816 crc32cx(crc, crc, tmp0);
4817 ldr(tmp2, Address(buf, 16));
4818 crc32cx(crc, crc, tmp1);
4819 ldr(tmp3, Address(buf, 24));
4820 crc32cx(crc, crc, tmp2);
4821 add(buf, buf, 32);
4822 subs(len, len, 32);
4823 crc32cx(crc, crc, tmp3);
4824 br(Assembler::GE, CRC_by32_loop);
4825 cmn(len, (u1)32);
4826 br(Assembler::NE, CRC_less32);
4827 b(L_exit);
4828
4829 BIND(CRC_by4_loop);
4830 ldrw(tmp0, Address(post(buf, 4)));
4831 subs(len, len, 4);
4832 crc32cw(crc, crc, tmp0);
4833 br(Assembler::GE, CRC_by4_loop);
4834 adds(len, len, 4);
4835 br(Assembler::LE, L_exit);
4836 BIND(CRC_by1_loop);
4837 ldrb(tmp0, Address(post(buf, 1)));
4838 subs(len, len, 1);
4839 crc32cb(crc, crc, tmp0);
4840 br(Assembler::GT, CRC_by1_loop);
4841 b(L_exit);
4842
4843 BIND(CRC_by128_pre);
4844 kernel_crc32_common_fold_using_crypto_pmull(crc, buf, len, tmp0, tmp1, tmp2,
4845 4*256*sizeof(juint) + 8*sizeof(juint) + 0x50);
4846 mov(crc, 0);
4847 crc32cx(crc, crc, tmp0);
4848 crc32cx(crc, crc, tmp1);
4849
4850 cbnz(len, CRC_less128);
4851
4852 BIND(L_exit);
4853 }
4854
4855 void MacroAssembler::kernel_crc32c_using_crc32c(Register crc, Register buf,
4856 Register len, Register tmp0, Register tmp1, Register tmp2,
4857 Register tmp3) {
4858 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop, CRC_less64, CRC_by64_pre, CRC_by32_loop, CRC_less32, L_exit;
4859 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2, tmp3);
4860
4861 subs(len, len, 128);
4862 br(Assembler::GE, CRC_by64_pre);
4863 BIND(CRC_less64);
4864 adds(len, len, 128-32);
4865 br(Assembler::GE, CRC_by32_loop);
4866 BIND(CRC_less32);
4867 adds(len, len, 32-4);
4868 br(Assembler::GE, CRC_by4_loop);
4869 adds(len, len, 4);
4870 br(Assembler::GT, CRC_by1_loop);
4871 b(L_exit);
4872
4873 BIND(CRC_by32_loop);
4874 ldp(tmp0, tmp1, Address(post(buf, 16)));
4875 subs(len, len, 32);
4876 crc32cx(crc, crc, tmp0);
4877 ldr(tmp2, Address(post(buf, 8)));
4878 crc32cx(crc, crc, tmp1);
4879 ldr(tmp3, Address(post(buf, 8)));
4880 crc32cx(crc, crc, tmp2);
4881 crc32cx(crc, crc, tmp3);
4882 br(Assembler::GE, CRC_by32_loop);
4883 cmn(len, (u1)32);
4884 br(Assembler::NE, CRC_less32);
4885 b(L_exit);
4886
4887 BIND(CRC_by4_loop);
4888 ldrw(tmp0, Address(post(buf, 4)));
4889 subs(len, len, 4);
4890 crc32cw(crc, crc, tmp0);
4891 br(Assembler::GE, CRC_by4_loop);
4892 adds(len, len, 4);
4893 br(Assembler::LE, L_exit);
4894 BIND(CRC_by1_loop);
4895 ldrb(tmp0, Address(post(buf, 1)));
4896 subs(len, len, 1);
4897 crc32cb(crc, crc, tmp0);
4898 br(Assembler::GT, CRC_by1_loop);
4899 b(L_exit);
4900
4901 BIND(CRC_by64_pre);
4902 sub(buf, buf, 8);
4903 ldp(tmp0, tmp1, Address(buf, 8));
4904 crc32cx(crc, crc, tmp0);
4905 ldr(tmp2, Address(buf, 24));
4906 crc32cx(crc, crc, tmp1);
4907 ldr(tmp3, Address(buf, 32));
4908 crc32cx(crc, crc, tmp2);
4909 ldr(tmp0, Address(buf, 40));
4910 crc32cx(crc, crc, tmp3);
4911 ldr(tmp1, Address(buf, 48));
4912 crc32cx(crc, crc, tmp0);
4913 ldr(tmp2, Address(buf, 56));
4914 crc32cx(crc, crc, tmp1);
4915 ldr(tmp3, Address(pre(buf, 64)));
4916
4917 b(CRC_by64_loop);
4918
4919 align(CodeEntryAlignment);
4920 BIND(CRC_by64_loop);
4921 subs(len, len, 64);
4922 crc32cx(crc, crc, tmp2);
4923 ldr(tmp0, Address(buf, 8));
4924 crc32cx(crc, crc, tmp3);
4925 ldr(tmp1, Address(buf, 16));
4926 crc32cx(crc, crc, tmp0);
4927 ldr(tmp2, Address(buf, 24));
4928 crc32cx(crc, crc, tmp1);
4929 ldr(tmp3, Address(buf, 32));
4930 crc32cx(crc, crc, tmp2);
4931 ldr(tmp0, Address(buf, 40));
4932 crc32cx(crc, crc, tmp3);
4933 ldr(tmp1, Address(buf, 48));
4934 crc32cx(crc, crc, tmp0);
4935 ldr(tmp2, Address(buf, 56));
4936 crc32cx(crc, crc, tmp1);
4937 ldr(tmp3, Address(pre(buf, 64)));
4938 br(Assembler::GE, CRC_by64_loop);
4939
4940 // post-loop
4941 crc32cx(crc, crc, tmp2);
4942 crc32cx(crc, crc, tmp3);
4943
4944 sub(len, len, 64);
4945 add(buf, buf, 8);
4946 cmn(len, (u1)128);
4947 br(Assembler::NE, CRC_less64);
4948 BIND(L_exit);
4949 }
4950
4951 /**
4952 * @param crc register containing existing CRC (32-bit)
4953 * @param buf register pointing to input byte buffer (byte*)
4954 * @param len register containing number of bytes
4955 * @param table register that will contain address of CRC table
4956 * @param tmp scratch register
4957 */
4958 void MacroAssembler::kernel_crc32c(Register crc, Register buf, Register len,
4959 Register table0, Register table1, Register table2, Register table3,
4960 Register tmp, Register tmp2, Register tmp3) {
4961 if (UseCryptoPmullForCRC32) {
4962 kernel_crc32c_using_crypto_pmull(crc, buf, len, table0, table1, table2, table3);
4963 } else {
4964 kernel_crc32c_using_crc32c(crc, buf, len, table0, table1, table2, table3);
4965 }
4966 }
4967
4968 void MacroAssembler::kernel_crc32_common_fold_using_crypto_pmull(Register crc, Register buf,
4969 Register len, Register tmp0, Register tmp1, Register tmp2, size_t table_offset) {
4970 Label CRC_by128_loop;
4971 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2);
4972
4973 sub(len, len, 256);
4974 Register table = tmp0;
4975 {
4976 uint64_t offset;
4977 adrp(table, ExternalAddress(StubRoutines::crc_table_addr()), offset);
4978 add(table, table, offset);
4979 }
4980 add(table, table, table_offset);
4981
4982 // Registers v0..v7 are used as data registers.
4983 // Registers v16..v31 are used as tmp registers.
4984 sub(buf, buf, 0x10);
4985 ldrq(v0, Address(buf, 0x10));
4986 ldrq(v1, Address(buf, 0x20));
4987 ldrq(v2, Address(buf, 0x30));
4988 ldrq(v3, Address(buf, 0x40));
4989 ldrq(v4, Address(buf, 0x50));
4990 ldrq(v5, Address(buf, 0x60));
4991 ldrq(v6, Address(buf, 0x70));
4992 ldrq(v7, Address(pre(buf, 0x80)));
4993
4994 movi(v31, T4S, 0);
4995 mov(v31, S, 0, crc);
4996 eor(v0, T16B, v0, v31);
4997
4998 // Register v16 contains constants from the crc table.
4999 ldrq(v16, Address(table));
5000 b(CRC_by128_loop);
5001
5002 align(OptoLoopAlignment);
5003 BIND(CRC_by128_loop);
5004 pmull (v17, T1Q, v0, v16, T1D);
5005 pmull2(v18, T1Q, v0, v16, T2D);
5006 ldrq(v0, Address(buf, 0x10));
5007 eor3(v0, T16B, v17, v18, v0);
5008
5009 pmull (v19, T1Q, v1, v16, T1D);
5010 pmull2(v20, T1Q, v1, v16, T2D);
5011 ldrq(v1, Address(buf, 0x20));
5012 eor3(v1, T16B, v19, v20, v1);
5013
5014 pmull (v21, T1Q, v2, v16, T1D);
5015 pmull2(v22, T1Q, v2, v16, T2D);
5016 ldrq(v2, Address(buf, 0x30));
5017 eor3(v2, T16B, v21, v22, v2);
5018
5019 pmull (v23, T1Q, v3, v16, T1D);
5020 pmull2(v24, T1Q, v3, v16, T2D);
5021 ldrq(v3, Address(buf, 0x40));
5022 eor3(v3, T16B, v23, v24, v3);
5023
5024 pmull (v25, T1Q, v4, v16, T1D);
5025 pmull2(v26, T1Q, v4, v16, T2D);
5026 ldrq(v4, Address(buf, 0x50));
5027 eor3(v4, T16B, v25, v26, v4);
5028
5029 pmull (v27, T1Q, v5, v16, T1D);
5030 pmull2(v28, T1Q, v5, v16, T2D);
5031 ldrq(v5, Address(buf, 0x60));
5032 eor3(v5, T16B, v27, v28, v5);
5033
5034 pmull (v29, T1Q, v6, v16, T1D);
5035 pmull2(v30, T1Q, v6, v16, T2D);
5036 ldrq(v6, Address(buf, 0x70));
5037 eor3(v6, T16B, v29, v30, v6);
5038
5039 // Reuse registers v23, v24.
5040 // Using them won't block the first instruction of the next iteration.
5041 pmull (v23, T1Q, v7, v16, T1D);
5042 pmull2(v24, T1Q, v7, v16, T2D);
5043 ldrq(v7, Address(pre(buf, 0x80)));
5044 eor3(v7, T16B, v23, v24, v7);
5045
5046 subs(len, len, 0x80);
5047 br(Assembler::GE, CRC_by128_loop);
5048
5049 // fold into 512 bits
5050 // Use v31 for constants because v16 can be still in use.
5051 ldrq(v31, Address(table, 0x10));
5052
5053 pmull (v17, T1Q, v0, v31, T1D);
5054 pmull2(v18, T1Q, v0, v31, T2D);
5055 eor3(v0, T16B, v17, v18, v4);
5056
5057 pmull (v19, T1Q, v1, v31, T1D);
5058 pmull2(v20, T1Q, v1, v31, T2D);
5059 eor3(v1, T16B, v19, v20, v5);
5060
5061 pmull (v21, T1Q, v2, v31, T1D);
5062 pmull2(v22, T1Q, v2, v31, T2D);
5063 eor3(v2, T16B, v21, v22, v6);
5064
5065 pmull (v23, T1Q, v3, v31, T1D);
5066 pmull2(v24, T1Q, v3, v31, T2D);
5067 eor3(v3, T16B, v23, v24, v7);
5068
5069 // fold into 128 bits
5070 // Use v17 for constants because v31 can be still in use.
5071 ldrq(v17, Address(table, 0x20));
5072 pmull (v25, T1Q, v0, v17, T1D);
5073 pmull2(v26, T1Q, v0, v17, T2D);
5074 eor3(v3, T16B, v3, v25, v26);
5075
5076 // Use v18 for constants because v17 can be still in use.
5077 ldrq(v18, Address(table, 0x30));
5078 pmull (v27, T1Q, v1, v18, T1D);
5079 pmull2(v28, T1Q, v1, v18, T2D);
5080 eor3(v3, T16B, v3, v27, v28);
5081
5082 // Use v19 for constants because v18 can be still in use.
5083 ldrq(v19, Address(table, 0x40));
5084 pmull (v29, T1Q, v2, v19, T1D);
5085 pmull2(v30, T1Q, v2, v19, T2D);
5086 eor3(v0, T16B, v3, v29, v30);
5087
5088 add(len, len, 0x80);
5089 add(buf, buf, 0x10);
5090
5091 mov(tmp0, v0, D, 0);
5092 mov(tmp1, v0, D, 1);
5093 }
5094
5095 void MacroAssembler::addptr(const Address &dst, int32_t src) {
5096 Address adr;
5097 switch(dst.getMode()) {
5098 case Address::base_plus_offset:
5099 // This is the expected mode, although we allow all the other
5100 // forms below.
5101 adr = form_address(rscratch2, dst.base(), dst.offset(), LogBytesPerWord);
5102 break;
5103 default:
5104 lea(rscratch2, dst);
5105 adr = Address(rscratch2);
5106 break;
5107 }
5108 ldr(rscratch1, adr);
5109 add(rscratch1, rscratch1, src);
5110 str(rscratch1, adr);
5111 }
5112
5113 void MacroAssembler::cmpptr(Register src1, Address src2) {
5114 uint64_t offset;
5115 adrp(rscratch1, src2, offset);
5116 ldr(rscratch1, Address(rscratch1, offset));
5117 cmp(src1, rscratch1);
5118 }
5119
5120 void MacroAssembler::cmpoop(Register obj1, Register obj2) {
5121 cmp(obj1, obj2);
5122 }
5123
5124 void MacroAssembler::load_method_holder_cld(Register rresult, Register rmethod) {
5125 load_method_holder(rresult, rmethod);
5126 ldr(rresult, Address(rresult, InstanceKlass::class_loader_data_offset()));
5127 }
5128
5129 void MacroAssembler::load_method_holder(Register holder, Register method) {
5130 ldr(holder, Address(method, Method::const_offset())); // ConstMethod*
5131 ldr(holder, Address(holder, ConstMethod::constants_offset())); // ConstantPool*
5132 ldr(holder, Address(holder, ConstantPool::pool_holder_offset())); // InstanceKlass*
5133 }
5134
5135 void MacroAssembler::load_metadata(Register dst, Register src) {
5136 if (UseCompactObjectHeaders) {
5137 load_narrow_klass_compact(dst, src);
5138 } else if (UseCompressedClassPointers) {
5139 ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5140 } else {
5141 ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5142 }
5143 }
5144
5145 // Loads the obj's Klass* into dst.
5146 // Preserves all registers (incl src, rscratch1 and rscratch2).
5147 // Input:
5148 // src - the oop we want to load the klass from.
5149 // dst - output narrow klass.
5150 void MacroAssembler::load_narrow_klass_compact(Register dst, Register src) {
5151 assert(UseCompactObjectHeaders, "expects UseCompactObjectHeaders");
5152 ldr(dst, Address(src, oopDesc::mark_offset_in_bytes()));
5153 lsr(dst, dst, markWord::klass_shift);
5154 }
5155
5156 void MacroAssembler::load_klass(Register dst, Register src) {
5157 if (UseCompactObjectHeaders) {
5158 load_narrow_klass_compact(dst, src);
5159 decode_klass_not_null(dst);
5160 } else if (UseCompressedClassPointers) {
5161 ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5162 decode_klass_not_null(dst);
5163 } else {
5164 ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));
5165 }
5166 }
5167
5168 void MacroAssembler::restore_cpu_control_state_after_jni(Register tmp1, Register tmp2) {
5169 if (RestoreMXCSROnJNICalls) {
5170 Label OK;
5171 get_fpcr(tmp1);
5172 mov(tmp2, tmp1);
5173 // Set FPCR to the state we need. We do want Round to Nearest. We
5174 // don't want non-IEEE rounding modes or floating-point traps.
5175 bfi(tmp1, zr, 22, 4); // Clear DN, FZ, and Rmode
5176 bfi(tmp1, zr, 8, 5); // Clear exception-control bits (8-12)
5177 bfi(tmp1, zr, 0, 2); // Clear AH:FIZ
5178 eor(tmp2, tmp1, tmp2);
5179 cbz(tmp2, OK); // Only reset FPCR if it's wrong
5180 set_fpcr(tmp1);
5181 bind(OK);
5182 }
5183 }
5184
5185 // ((OopHandle)result).resolve();
5186 void MacroAssembler::resolve_oop_handle(Register result, Register tmp1, Register tmp2) {
5187 // OopHandle::resolve is an indirection.
5188 access_load_at(T_OBJECT, IN_NATIVE, result, Address(result, 0), tmp1, tmp2);
5189 }
5190
5191 // ((WeakHandle)result).resolve();
5192 void MacroAssembler::resolve_weak_handle(Register result, Register tmp1, Register tmp2) {
5193 assert_different_registers(result, tmp1, tmp2);
5194 Label resolved;
5195
5196 // A null weak handle resolves to null.
5197 cbz(result, resolved);
5198
5199 // Only 64 bit platforms support GCs that require a tmp register
5200 // WeakHandle::resolve is an indirection like jweak.
5201 access_load_at(T_OBJECT, IN_NATIVE | ON_PHANTOM_OOP_REF,
5202 result, Address(result), tmp1, tmp2);
5203 bind(resolved);
5204 }
5205
5206 void MacroAssembler::load_mirror(Register dst, Register method, Register tmp1, Register tmp2) {
5207 const int mirror_offset = in_bytes(Klass::java_mirror_offset());
5208 ldr(dst, Address(rmethod, Method::const_offset()));
5209 ldr(dst, Address(dst, ConstMethod::constants_offset()));
5210 ldr(dst, Address(dst, ConstantPool::pool_holder_offset()));
5211 ldr(dst, Address(dst, mirror_offset));
5212 resolve_oop_handle(dst, tmp1, tmp2);
5213 }
5214
5215 void MacroAssembler::cmp_klass(Register obj, Register klass, Register tmp) {
5216 assert_different_registers(obj, klass, tmp);
5217 if (UseCompressedClassPointers) {
5218 if (UseCompactObjectHeaders) {
5219 load_narrow_klass_compact(tmp, obj);
5220 } else {
5221 ldrw(tmp, Address(obj, oopDesc::klass_offset_in_bytes()));
5222 }
5223 if (CompressedKlassPointers::base() == nullptr) {
5224 cmp(klass, tmp, LSL, CompressedKlassPointers::shift());
5225 return;
5226 } else if (((uint64_t)CompressedKlassPointers::base() & 0xffffffff) == 0
5227 && CompressedKlassPointers::shift() == 0) {
5228 // Only the bottom 32 bits matter
5229 cmpw(klass, tmp);
5230 return;
5231 }
5232 decode_klass_not_null(tmp);
5233 } else {
5234 ldr(tmp, Address(obj, oopDesc::klass_offset_in_bytes()));
5235 }
5236 cmp(klass, tmp);
5237 }
5238
5239 void MacroAssembler::cmp_klasses_from_objects(Register obj1, Register obj2, Register tmp1, Register tmp2) {
5240 if (UseCompactObjectHeaders) {
5241 load_narrow_klass_compact(tmp1, obj1);
5242 load_narrow_klass_compact(tmp2, obj2);
5243 cmpw(tmp1, tmp2);
5244 } else if (UseCompressedClassPointers) {
5245 ldrw(tmp1, Address(obj1, oopDesc::klass_offset_in_bytes()));
5246 ldrw(tmp2, Address(obj2, oopDesc::klass_offset_in_bytes()));
5247 cmpw(tmp1, tmp2);
5248 } else {
5249 ldr(tmp1, Address(obj1, oopDesc::klass_offset_in_bytes()));
5250 ldr(tmp2, Address(obj2, oopDesc::klass_offset_in_bytes()));
5251 cmp(tmp1, tmp2);
5252 }
5253 }
5254
5255 void MacroAssembler::load_prototype_header(Register dst, Register src) {
5256 load_klass(dst, src);
5257 ldr(dst, Address(dst, Klass::prototype_header_offset()));
5258 }
5259
5260 void MacroAssembler::store_klass(Register dst, Register src) {
5261 // FIXME: Should this be a store release? concurrent gcs assumes
5262 // klass length is valid if klass field is not null.
5263 assert(!UseCompactObjectHeaders, "not with compact headers");
5264 if (UseCompressedClassPointers) {
5265 encode_klass_not_null(src);
5266 strw(src, Address(dst, oopDesc::klass_offset_in_bytes()));
5267 } else {
5268 str(src, Address(dst, oopDesc::klass_offset_in_bytes()));
5269 }
5270 }
5271
5272 void MacroAssembler::store_klass_gap(Register dst, Register src) {
5273 assert(!UseCompactObjectHeaders, "not with compact headers");
5274 if (UseCompressedClassPointers) {
5275 // Store to klass gap in destination
5276 strw(src, Address(dst, oopDesc::klass_gap_offset_in_bytes()));
5277 }
5278 }
5279
5280 // Algorithm must match CompressedOops::encode.
5281 void MacroAssembler::encode_heap_oop(Register d, Register s) {
5282 #ifdef ASSERT
5283 verify_heapbase("MacroAssembler::encode_heap_oop: heap base corrupted?");
5284 #endif
5285 verify_oop_msg(s, "broken oop in encode_heap_oop");
5286 if (CompressedOops::base() == nullptr) {
5287 if (CompressedOops::shift() != 0) {
5288 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
5289 lsr(d, s, LogMinObjAlignmentInBytes);
5290 } else {
5291 mov(d, s);
5292 }
5293 } else {
5294 subs(d, s, rheapbase);
5295 csel(d, d, zr, Assembler::HS);
5296 lsr(d, d, LogMinObjAlignmentInBytes);
5297
5298 /* Old algorithm: is this any worse?
5299 Label nonnull;
5300 cbnz(r, nonnull);
5301 sub(r, r, rheapbase);
5302 bind(nonnull);
5303 lsr(r, r, LogMinObjAlignmentInBytes);
5304 */
5305 }
5306 }
5307
5308 void MacroAssembler::encode_heap_oop_not_null(Register r) {
5309 #ifdef ASSERT
5310 verify_heapbase("MacroAssembler::encode_heap_oop_not_null: heap base corrupted?");
5311 if (CheckCompressedOops) {
5312 Label ok;
5313 cbnz(r, ok);
5314 stop("null oop passed to encode_heap_oop_not_null");
5315 bind(ok);
5316 }
5317 #endif
5318 verify_oop_msg(r, "broken oop in encode_heap_oop_not_null");
5319 if (CompressedOops::base() != nullptr) {
5320 sub(r, r, rheapbase);
5321 }
5322 if (CompressedOops::shift() != 0) {
5323 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
5324 lsr(r, r, LogMinObjAlignmentInBytes);
5325 }
5326 }
5327
5328 void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) {
5329 #ifdef ASSERT
5330 verify_heapbase("MacroAssembler::encode_heap_oop_not_null2: heap base corrupted?");
5331 if (CheckCompressedOops) {
5332 Label ok;
5333 cbnz(src, ok);
5334 stop("null oop passed to encode_heap_oop_not_null2");
5335 bind(ok);
5336 }
5337 #endif
5338 verify_oop_msg(src, "broken oop in encode_heap_oop_not_null2");
5339
5340 Register data = src;
5341 if (CompressedOops::base() != nullptr) {
5342 sub(dst, src, rheapbase);
5343 data = dst;
5344 }
5345 if (CompressedOops::shift() != 0) {
5346 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
5347 lsr(dst, data, LogMinObjAlignmentInBytes);
5348 data = dst;
5349 }
5350 if (data == src)
5351 mov(dst, src);
5352 }
5353
5354 void MacroAssembler::decode_heap_oop(Register d, Register s) {
5355 #ifdef ASSERT
5356 verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?");
5357 #endif
5358 if (CompressedOops::base() == nullptr) {
5359 if (CompressedOops::shift() != 0) {
5360 lsl(d, s, CompressedOops::shift());
5361 } else if (d != s) {
5362 mov(d, s);
5363 }
5364 } else {
5365 Label done;
5366 if (d != s)
5367 mov(d, s);
5368 cbz(s, done);
5369 add(d, rheapbase, s, Assembler::LSL, LogMinObjAlignmentInBytes);
5370 bind(done);
5371 }
5372 verify_oop_msg(d, "broken oop in decode_heap_oop");
5373 }
5374
5375 void MacroAssembler::decode_heap_oop_not_null(Register r) {
5376 assert (UseCompressedOops, "should only be used for compressed headers");
5377 assert (Universe::heap() != nullptr, "java heap should be initialized");
5378 // Cannot assert, unverified entry point counts instructions (see .ad file)
5379 // vtableStubs also counts instructions in pd_code_size_limit.
5380 // Also do not verify_oop as this is called by verify_oop.
5381 if (CompressedOops::shift() != 0) {
5382 assert(LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
5383 if (CompressedOops::base() != nullptr) {
5384 add(r, rheapbase, r, Assembler::LSL, LogMinObjAlignmentInBytes);
5385 } else {
5386 add(r, zr, r, Assembler::LSL, LogMinObjAlignmentInBytes);
5387 }
5388 } else {
5389 assert (CompressedOops::base() == nullptr, "sanity");
5390 }
5391 }
5392
5393 void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) {
5394 assert (UseCompressedOops, "should only be used for compressed headers");
5395 assert (Universe::heap() != nullptr, "java heap should be initialized");
5396 // Cannot assert, unverified entry point counts instructions (see .ad file)
5397 // vtableStubs also counts instructions in pd_code_size_limit.
5398 // Also do not verify_oop as this is called by verify_oop.
5399 if (CompressedOops::shift() != 0) {
5400 assert(LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
5401 if (CompressedOops::base() != nullptr) {
5402 add(dst, rheapbase, src, Assembler::LSL, LogMinObjAlignmentInBytes);
5403 } else {
5404 add(dst, zr, src, Assembler::LSL, LogMinObjAlignmentInBytes);
5405 }
5406 } else {
5407 assert (CompressedOops::base() == nullptr, "sanity");
5408 if (dst != src) {
5409 mov(dst, src);
5410 }
5411 }
5412 }
5413
5414 MacroAssembler::KlassDecodeMode MacroAssembler::_klass_decode_mode(KlassDecodeNone);
5415
5416 MacroAssembler::KlassDecodeMode MacroAssembler::klass_decode_mode() {
5417 assert(Metaspace::initialized(), "metaspace not initialized yet");
5418 assert(_klass_decode_mode != KlassDecodeNone, "should be initialized");
5419 return _klass_decode_mode;
5420 }
5421
5422 MacroAssembler::KlassDecodeMode MacroAssembler::klass_decode_mode(address base, int shift, const size_t range) {
5423 assert(UseCompressedClassPointers, "not using compressed class pointers");
5424
5425 // KlassDecodeMode shouldn't be set already.
5426 assert(_klass_decode_mode == KlassDecodeNone, "set once");
5427
5428 if (base == nullptr) {
5429 return KlassDecodeZero;
5430 }
5431
5432 if (operand_valid_for_logical_immediate(
5433 /*is32*/false, (uint64_t)base)) {
5434 const uint64_t range_mask = right_n_bits(log2i_ceil(range));
5435 if (((uint64_t)base & range_mask) == 0) {
5436 return KlassDecodeXor;
5437 }
5438 }
5439
5440 const uint64_t shifted_base =
5441 (uint64_t)base >> shift;
5442 if ((shifted_base & 0xffff0000ffffffff) == 0) {
5443 return KlassDecodeMovk;
5444 }
5445
5446 // No valid encoding.
5447 return KlassDecodeNone;
5448 }
5449
5450 // Check if one of the above decoding modes will work for given base, shift and range.
5451 bool MacroAssembler::check_klass_decode_mode(address base, int shift, const size_t range) {
5452 return klass_decode_mode(base, shift, range) != KlassDecodeNone;
5453 }
5454
5455 bool MacroAssembler::set_klass_decode_mode(address base, int shift, const size_t range) {
5456 _klass_decode_mode = klass_decode_mode(base, shift, range);
5457 return _klass_decode_mode != KlassDecodeNone;
5458 }
5459
5460 void MacroAssembler::encode_klass_not_null(Register dst, Register src) {
5461 switch (klass_decode_mode()) {
5462 case KlassDecodeZero:
5463 if (CompressedKlassPointers::shift() != 0) {
5464 lsr(dst, src, CompressedKlassPointers::shift());
5465 } else {
5466 if (dst != src) mov(dst, src);
5467 }
5468 break;
5469
5470 case KlassDecodeXor:
5471 if (CompressedKlassPointers::shift() != 0) {
5472 eor(dst, src, (uint64_t)CompressedKlassPointers::base());
5473 lsr(dst, dst, CompressedKlassPointers::shift());
5474 } else {
5475 eor(dst, src, (uint64_t)CompressedKlassPointers::base());
5476 }
5477 break;
5478
5479 case KlassDecodeMovk:
5480 if (CompressedKlassPointers::shift() != 0) {
5481 ubfx(dst, src, CompressedKlassPointers::shift(), 32);
5482 } else {
5483 movw(dst, src);
5484 }
5485 break;
5486
5487 case KlassDecodeNone:
5488 ShouldNotReachHere();
5489 break;
5490 }
5491 }
5492
5493 void MacroAssembler::encode_klass_not_null(Register r) {
5494 encode_klass_not_null(r, r);
5495 }
5496
5497 void MacroAssembler::decode_klass_not_null(Register dst, Register src) {
5498 assert (UseCompressedClassPointers, "should only be used for compressed headers");
5499
5500 switch (klass_decode_mode()) {
5501 case KlassDecodeZero:
5502 if (CompressedKlassPointers::shift() != 0) {
5503 lsl(dst, src, CompressedKlassPointers::shift());
5504 } else {
5505 if (dst != src) mov(dst, src);
5506 }
5507 break;
5508
5509 case KlassDecodeXor:
5510 if (CompressedKlassPointers::shift() != 0) {
5511 lsl(dst, src, CompressedKlassPointers::shift());
5512 eor(dst, dst, (uint64_t)CompressedKlassPointers::base());
5513 } else {
5514 eor(dst, src, (uint64_t)CompressedKlassPointers::base());
5515 }
5516 break;
5517
5518 case KlassDecodeMovk: {
5519 const uint64_t shifted_base =
5520 (uint64_t)CompressedKlassPointers::base() >> CompressedKlassPointers::shift();
5521
5522 if (dst != src) movw(dst, src);
5523 movk(dst, shifted_base >> 32, 32);
5524
5525 if (CompressedKlassPointers::shift() != 0) {
5526 lsl(dst, dst, CompressedKlassPointers::shift());
5527 }
5528
5529 break;
5530 }
5531
5532 case KlassDecodeNone:
5533 ShouldNotReachHere();
5534 break;
5535 }
5536 }
5537
5538 void MacroAssembler::decode_klass_not_null(Register r) {
5539 decode_klass_not_null(r, r);
5540 }
5541
5542 void MacroAssembler::set_narrow_oop(Register dst, jobject obj) {
5543 #ifdef ASSERT
5544 {
5545 ThreadInVMfromUnknown tiv;
5546 assert (UseCompressedOops, "should only be used for compressed oops");
5547 assert (Universe::heap() != nullptr, "java heap should be initialized");
5548 assert (oop_recorder() != nullptr, "this assembler needs an OopRecorder");
5549 assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "should be real oop");
5550 }
5551 #endif
5552 int oop_index = oop_recorder()->find_index(obj);
5553 InstructionMark im(this);
5554 RelocationHolder rspec = oop_Relocation::spec(oop_index);
5555 code_section()->relocate(inst_mark(), rspec);
5556 movz(dst, 0xDEAD, 16);
5557 movk(dst, 0xBEEF);
5558 }
5559
5560 void MacroAssembler::set_narrow_klass(Register dst, Klass* k) {
5561 assert (UseCompressedClassPointers, "should only be used for compressed headers");
5562 assert (oop_recorder() != nullptr, "this assembler needs an OopRecorder");
5563 int index = oop_recorder()->find_index(k);
5564 assert(! Universe::heap()->is_in(k), "should not be an oop");
5565
5566 InstructionMark im(this);
5567 RelocationHolder rspec = metadata_Relocation::spec(index);
5568 code_section()->relocate(inst_mark(), rspec);
5569 narrowKlass nk = CompressedKlassPointers::encode(k);
5570 movz(dst, (nk >> 16), 16);
5571 movk(dst, nk & 0xffff);
5572 }
5573
5574 void MacroAssembler::access_load_at(BasicType type, DecoratorSet decorators,
5575 Register dst, Address src,
5576 Register tmp1, Register tmp2) {
5577 BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5578 decorators = AccessInternal::decorator_fixup(decorators, type);
5579 bool as_raw = (decorators & AS_RAW) != 0;
5580 if (as_raw) {
5581 bs->BarrierSetAssembler::load_at(this, decorators, type, dst, src, tmp1, tmp2);
5582 } else {
5583 bs->load_at(this, decorators, type, dst, src, tmp1, tmp2);
5584 }
5585 }
5586
5587 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
5588 Address dst, Register val,
5589 Register tmp1, Register tmp2, Register tmp3) {
5590 BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5591 decorators = AccessInternal::decorator_fixup(decorators, type);
5592 bool as_raw = (decorators & AS_RAW) != 0;
5593 if (as_raw) {
5594 bs->BarrierSetAssembler::store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5595 } else {
5596 bs->store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
5597 }
5598 }
5599
5600 void MacroAssembler::flat_field_copy(DecoratorSet decorators, Register src, Register dst,
5601 Register inline_layout_info) {
5602 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
5603 bs->flat_field_copy(this, decorators, src, dst, inline_layout_info);
5604 }
5605
5606 void MacroAssembler::payload_offset(Register inline_klass, Register offset) {
5607 ldr(offset, Address(inline_klass, InstanceKlass::adr_inlineklass_fixed_block_offset()));
5608 ldrw(offset, Address(offset, InlineKlass::payload_offset_offset()));
5609 }
5610
5611 void MacroAssembler::payload_address(Register oop, Register data, Register inline_klass) {
5612 // ((address) (void*) o) + vk->payload_offset();
5613 Register offset = (data == oop) ? rscratch1 : data;
5614 payload_offset(inline_klass, offset);
5615 if (data == oop) {
5616 add(data, data, offset);
5617 } else {
5618 lea(data, Address(oop, offset));
5619 }
5620 }
5621
5622 void MacroAssembler::data_for_value_array_index(Register array, Register array_klass,
5623 Register index, Register data) {
5624 assert_different_registers(array, array_klass, index);
5625 assert_different_registers(rscratch1, array, index);
5626
5627 // array->base() + (index << Klass::layout_helper_log2_element_size(lh));
5628 ldrw(rscratch1, Address(array_klass, Klass::layout_helper_offset()));
5629
5630 // Klass::layout_helper_log2_element_size(lh)
5631 // (lh >> _lh_log2_element_size_shift) & _lh_log2_element_size_mask;
5632 lsr(rscratch1, rscratch1, Klass::_lh_log2_element_size_shift);
5633 andr(rscratch1, rscratch1, Klass::_lh_log2_element_size_mask);
5634 lslv(index, index, rscratch1);
5635
5636 add(data, array, index);
5637 add(data, data, arrayOopDesc::base_offset_in_bytes(T_FLAT_ELEMENT));
5638 }
5639
5640 void MacroAssembler::load_heap_oop(Register dst, Address src, Register tmp1,
5641 Register tmp2, DecoratorSet decorators) {
5642 access_load_at(T_OBJECT, IN_HEAP | decorators, dst, src, tmp1, tmp2);
5643 }
5644
5645 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src, Register tmp1,
5646 Register tmp2, DecoratorSet decorators) {
5647 access_load_at(T_OBJECT, IN_HEAP | IS_NOT_NULL | decorators, dst, src, tmp1, tmp2);
5648 }
5649
5650 void MacroAssembler::store_heap_oop(Address dst, Register val, Register tmp1,
5651 Register tmp2, Register tmp3, DecoratorSet decorators) {
5652 access_store_at(T_OBJECT, IN_HEAP | decorators, dst, val, tmp1, tmp2, tmp3);
5653 }
5654
5655 // Used for storing nulls.
5656 void MacroAssembler::store_heap_oop_null(Address dst) {
5657 access_store_at(T_OBJECT, IN_HEAP, dst, noreg, noreg, noreg, noreg);
5658 }
5659
5660 Address MacroAssembler::allocate_metadata_address(Metadata* obj) {
5661 assert(oop_recorder() != nullptr, "this assembler needs a Recorder");
5662 int index = oop_recorder()->allocate_metadata_index(obj);
5663 RelocationHolder rspec = metadata_Relocation::spec(index);
5664 return Address((address)obj, rspec);
5665 }
5666
5667 // Move an oop into a register.
5668 void MacroAssembler::movoop(Register dst, jobject obj) {
5669 int oop_index;
5670 if (obj == nullptr) {
5671 oop_index = oop_recorder()->allocate_oop_index(obj);
5672 } else {
5673 #ifdef ASSERT
5674 {
5675 ThreadInVMfromUnknown tiv;
5676 assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "should be real oop");
5677 }
5678 #endif
5679 oop_index = oop_recorder()->find_index(obj);
5680 }
5681 RelocationHolder rspec = oop_Relocation::spec(oop_index);
5682
5683 if (BarrierSet::barrier_set()->barrier_set_assembler()->supports_instruction_patching()) {
5684 mov(dst, Address((address)obj, rspec));
5685 } else {
5686 address dummy = address(uintptr_t(pc()) & -wordSize); // A nearby aligned address
5687 ldr_constant(dst, Address(dummy, rspec));
5688 }
5689
5690 }
5691
5692 // Move a metadata address into a register.
5693 void MacroAssembler::mov_metadata(Register dst, Metadata* obj) {
5694 int oop_index;
5695 if (obj == nullptr) {
5696 oop_index = oop_recorder()->allocate_metadata_index(obj);
5697 } else {
5698 oop_index = oop_recorder()->find_index(obj);
5699 }
5700 RelocationHolder rspec = metadata_Relocation::spec(oop_index);
5701 mov(dst, Address((address)obj, rspec));
5702 }
5703
5704 Address MacroAssembler::constant_oop_address(jobject obj) {
5705 #ifdef ASSERT
5706 {
5707 ThreadInVMfromUnknown tiv;
5708 assert(oop_recorder() != nullptr, "this assembler needs an OopRecorder");
5709 assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "not an oop");
5710 }
5711 #endif
5712 int oop_index = oop_recorder()->find_index(obj);
5713 return Address((address)obj, oop_Relocation::spec(oop_index));
5714 }
5715
5716 // Object / value buffer allocation...
5717 void MacroAssembler::allocate_instance(Register klass, Register new_obj,
5718 Register t1, Register t2,
5719 bool clear_fields, Label& alloc_failed)
5720 {
5721 Label done, initialize_header, initialize_object, slow_case, slow_case_no_pop;
5722 Register layout_size = t1;
5723 assert(new_obj == r0, "needs to be r0");
5724 assert_different_registers(klass, new_obj, t1, t2);
5725
5726 // get instance_size in InstanceKlass (scaled to a count of bytes)
5727 ldrw(layout_size, Address(klass, Klass::layout_helper_offset()));
5728 // test to see if it is malformed in some way
5729 tst(layout_size, Klass::_lh_instance_slow_path_bit);
5730 br(Assembler::NE, slow_case_no_pop);
5731
5732 // Allocate the instance:
5733 // If TLAB is enabled:
5734 // Try to allocate in the TLAB.
5735 // If fails, go to the slow path.
5736 // Initialize the allocation.
5737 // Exit.
5738 //
5739 // Go to slow path.
5740
5741 if (UseTLAB) {
5742 push(klass);
5743 tlab_allocate(new_obj, layout_size, 0, klass, t2, slow_case);
5744 if (ZeroTLAB || (!clear_fields)) {
5745 // the fields have been already cleared
5746 b(initialize_header);
5747 } else {
5748 // initialize both the header and fields
5749 b(initialize_object);
5750 }
5751
5752 if (clear_fields) {
5753 // The object is initialized before the header. If the object size is
5754 // zero, go directly to the header initialization.
5755 bind(initialize_object);
5756 int header_size = oopDesc::header_size() * HeapWordSize;
5757 assert(is_aligned(header_size, BytesPerLong), "oop header size must be 8-byte-aligned");
5758 subs(layout_size, layout_size, header_size);
5759 br(Assembler::EQ, initialize_header);
5760
5761 // Initialize topmost object field, divide size by 8, check if odd and
5762 // test if zero.
5763
5764 #ifdef ASSERT
5765 // make sure instance_size was multiple of 8
5766 Label L;
5767 tst(layout_size, 7);
5768 br(Assembler::EQ, L);
5769 stop("object size is not multiple of 8 - adjust this code");
5770 bind(L);
5771 // must be > 0, no extra check needed here
5772 #endif
5773
5774 lsr(layout_size, layout_size, LogBytesPerLong);
5775
5776 // initialize remaining object fields: instance_size was a multiple of 8
5777 {
5778 Label loop;
5779 Register base = t2;
5780
5781 bind(loop);
5782 add(rscratch1, new_obj, layout_size, Assembler::LSL, LogBytesPerLong);
5783 str(zr, Address(rscratch1, header_size - 1*oopSize));
5784 subs(layout_size, layout_size, 1);
5785 br(Assembler::NE, loop);
5786 }
5787 } // clear_fields
5788
5789 // initialize object header only.
5790 bind(initialize_header);
5791 pop(klass);
5792 Register mark_word = t2;
5793 if (UseCompactObjectHeaders || EnableValhalla) {
5794 ldr(mark_word, Address(klass, Klass::prototype_header_offset()));
5795 str(mark_word, Address(new_obj, oopDesc::mark_offset_in_bytes()));
5796 } else {
5797 mov(mark_word, (intptr_t)markWord::prototype().value());
5798 str(mark_word, Address(new_obj, oopDesc::mark_offset_in_bytes()));
5799 }
5800 if (!UseCompactObjectHeaders) {
5801 store_klass_gap(new_obj, zr); // zero klass gap for compressed oops
5802 mov(t2, klass); // preserve klass
5803 store_klass(new_obj, t2); // src klass reg is potentially compressed
5804 }
5805 // TODO: Valhalla removed SharedRuntime::dtrace_object_alloc from here ?
5806
5807 b(done);
5808 }
5809
5810 if (UseTLAB) {
5811 bind(slow_case);
5812 pop(klass);
5813 }
5814 bind(slow_case_no_pop);
5815 b(alloc_failed);
5816
5817 bind(done);
5818 }
5819
5820 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
5821 void MacroAssembler::tlab_allocate(Register obj,
5822 Register var_size_in_bytes,
5823 int con_size_in_bytes,
5824 Register t1,
5825 Register t2,
5826 Label& slow_case) {
5827 BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
5828 bs->tlab_allocate(this, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
5829 }
5830
5831 void MacroAssembler::inc_held_monitor_count(Register tmp) {
5832 Address dst(rthread, JavaThread::held_monitor_count_offset());
5833 #ifdef ASSERT
5834 ldr(tmp, dst);
5835 increment(tmp);
5836 str(tmp, dst);
5837 Label ok;
5838 tbz(tmp, 63, ok);
5839 STOP("assert(held monitor count underflow)");
5840 should_not_reach_here();
5841 bind(ok);
5842 #else
5843 increment(dst);
5844 #endif
5845 }
5846
5847 void MacroAssembler::dec_held_monitor_count(Register tmp) {
5848 Address dst(rthread, JavaThread::held_monitor_count_offset());
5849 #ifdef ASSERT
5850 ldr(tmp, dst);
5851 decrement(tmp);
5852 str(tmp, dst);
5853 Label ok;
5854 tbz(tmp, 63, ok);
5855 STOP("assert(held monitor count underflow)");
5856 should_not_reach_here();
5857 bind(ok);
5858 #else
5859 decrement(dst);
5860 #endif
5861 }
5862
5863 void MacroAssembler::verify_tlab() {
5864 #ifdef ASSERT
5865 if (UseTLAB && VerifyOops) {
5866 Label next, ok;
5867
5868 stp(rscratch2, rscratch1, Address(pre(sp, -16)));
5869
5870 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_top_offset())));
5871 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset())));
5872 cmp(rscratch2, rscratch1);
5873 br(Assembler::HS, next);
5874 STOP("assert(top >= start)");
5875 should_not_reach_here();
5876
5877 bind(next);
5878 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_end_offset())));
5879 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_top_offset())));
5880 cmp(rscratch2, rscratch1);
5881 br(Assembler::HS, ok);
5882 STOP("assert(top <= end)");
5883 should_not_reach_here();
5884
5885 bind(ok);
5886 ldp(rscratch2, rscratch1, Address(post(sp, 16)));
5887 }
5888 #endif
5889 }
5890
5891 void MacroAssembler::get_inline_type_field_klass(Register holder_klass, Register index, Register inline_klass) {
5892 inline_layout_info(holder_klass, index, inline_klass);
5893 ldr(inline_klass, Address(inline_klass, InlineLayoutInfo::klass_offset()));
5894 }
5895
5896 void MacroAssembler::inline_layout_info(Register holder_klass, Register index, Register layout_info) {
5897 assert_different_registers(holder_klass, index, layout_info);
5898 InlineLayoutInfo array[2];
5899 int size = (char*)&array[1] - (char*)&array[0]; // computing size of array elements
5900 if (is_power_of_2(size)) {
5901 lsl(index, index, log2i_exact(size)); // Scale index by power of 2
5902 } else {
5903 mov(layout_info, size);
5904 mul(index, index, layout_info); // Scale the index to be the entry index * array_element_size
5905 }
5906 ldr(layout_info, Address(holder_klass, InstanceKlass::inline_layout_info_array_offset()));
5907 add(layout_info, layout_info, Array<InlineLayoutInfo>::base_offset_in_bytes());
5908 lea(layout_info, Address(layout_info, index));
5909 }
5910
5911 // Writes to stack successive pages until offset reached to check for
5912 // stack overflow + shadow pages. This clobbers tmp.
5913 void MacroAssembler::bang_stack_size(Register size, Register tmp) {
5914 assert_different_registers(tmp, size, rscratch1);
5915 mov(tmp, sp);
5916 // Bang stack for total size given plus shadow page size.
5917 // Bang one page at a time because large size can bang beyond yellow and
5918 // red zones.
5919 Label loop;
5920 mov(rscratch1, (int)os::vm_page_size());
5921 bind(loop);
5922 lea(tmp, Address(tmp, -(int)os::vm_page_size()));
5923 subsw(size, size, rscratch1);
5924 str(size, Address(tmp));
5925 br(Assembler::GT, loop);
5926
5927 // Bang down shadow pages too.
5928 // At this point, (tmp-0) is the last address touched, so don't
5929 // touch it again. (It was touched as (tmp-pagesize) but then tmp
5930 // was post-decremented.) Skip this address by starting at i=1, and
5931 // touch a few more pages below. N.B. It is important to touch all
5932 // the way down to and including i=StackShadowPages.
5933 for (int i = 0; i < (int)(StackOverflow::stack_shadow_zone_size() / (int)os::vm_page_size()) - 1; i++) {
5934 // this could be any sized move but this is can be a debugging crumb
5935 // so the bigger the better.
5936 lea(tmp, Address(tmp, -(int)os::vm_page_size()));
5937 str(size, Address(tmp));
5938 }
5939 }
5940
5941 // Move the address of the polling page into dest.
5942 void MacroAssembler::get_polling_page(Register dest, relocInfo::relocType rtype) {
5943 ldr(dest, Address(rthread, JavaThread::polling_page_offset()));
5944 }
5945
5946 // Read the polling page. The address of the polling page must
5947 // already be in r.
5948 address MacroAssembler::read_polling_page(Register r, relocInfo::relocType rtype) {
5949 address mark;
5950 {
5951 InstructionMark im(this);
5952 code_section()->relocate(inst_mark(), rtype);
5953 ldrw(zr, Address(r, 0));
5954 mark = inst_mark();
5955 }
5956 verify_cross_modify_fence_not_required();
5957 return mark;
5958 }
5959
5960 void MacroAssembler::adrp(Register reg1, const Address &dest, uint64_t &byte_offset) {
5961 relocInfo::relocType rtype = dest.rspec().reloc()->type();
5962 uint64_t low_page = (uint64_t)CodeCache::low_bound() >> 12;
5963 uint64_t high_page = (uint64_t)(CodeCache::high_bound()-1) >> 12;
5964 uint64_t dest_page = (uint64_t)dest.target() >> 12;
5965 int64_t offset_low = dest_page - low_page;
5966 int64_t offset_high = dest_page - high_page;
5967
5968 assert(is_valid_AArch64_address(dest.target()), "bad address");
5969 assert(dest.getMode() == Address::literal, "ADRP must be applied to a literal address");
5970
5971 InstructionMark im(this);
5972 code_section()->relocate(inst_mark(), dest.rspec());
5973 // 8143067: Ensure that the adrp can reach the dest from anywhere within
5974 // the code cache so that if it is relocated we know it will still reach
5975 if (offset_high >= -(1<<20) && offset_low < (1<<20)) {
5976 _adrp(reg1, dest.target());
5977 } else {
5978 uint64_t target = (uint64_t)dest.target();
5979 uint64_t adrp_target
5980 = (target & 0xffffffffULL) | ((uint64_t)pc() & 0xffff00000000ULL);
5981
5982 _adrp(reg1, (address)adrp_target);
5983 movk(reg1, target >> 32, 32);
5984 }
5985 byte_offset = (uint64_t)dest.target() & 0xfff;
5986 }
5987
5988 void MacroAssembler::load_byte_map_base(Register reg) {
5989 CardTable::CardValue* byte_map_base =
5990 ((CardTableBarrierSet*)(BarrierSet::barrier_set()))->card_table()->byte_map_base();
5991
5992 // Strictly speaking the byte_map_base isn't an address at all, and it might
5993 // even be negative. It is thus materialised as a constant.
5994 mov(reg, (uint64_t)byte_map_base);
5995 }
5996
5997 void MacroAssembler::build_frame(int framesize) {
5998 assert(framesize >= 2 * wordSize, "framesize must include space for FP/LR");
5999 assert(framesize % (2*wordSize) == 0, "must preserve 2*wordSize alignment");
6000 protect_return_address();
6001 if (framesize < ((1 << 9) + 2 * wordSize)) {
6002 sub(sp, sp, framesize);
6003 stp(rfp, lr, Address(sp, framesize - 2 * wordSize));
6004 if (PreserveFramePointer) add(rfp, sp, framesize - 2 * wordSize);
6005 } else {
6006 stp(rfp, lr, Address(pre(sp, -2 * wordSize)));
6007 if (PreserveFramePointer) mov(rfp, sp);
6008 if (framesize < ((1 << 12) + 2 * wordSize))
6009 sub(sp, sp, framesize - 2 * wordSize);
6010 else {
6011 mov(rscratch1, framesize - 2 * wordSize);
6012 sub(sp, sp, rscratch1);
6013 }
6014 }
6015 verify_cross_modify_fence_not_required();
6016 }
6017
6018 void MacroAssembler::remove_frame(int framesize) {
6019 assert(framesize >= 2 * wordSize, "framesize must include space for FP/LR");
6020 assert(framesize % (2*wordSize) == 0, "must preserve 2*wordSize alignment");
6021 if (framesize < ((1 << 9) + 2 * wordSize)) {
6022 ldp(rfp, lr, Address(sp, framesize - 2 * wordSize));
6023 add(sp, sp, framesize);
6024 } else {
6025 if (framesize < ((1 << 12) + 2 * wordSize))
6026 add(sp, sp, framesize - 2 * wordSize);
6027 else {
6028 mov(rscratch1, framesize - 2 * wordSize);
6029 add(sp, sp, rscratch1);
6030 }
6031 ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
6032 }
6033 authenticate_return_address();
6034 }
6035
6036 void MacroAssembler::remove_frame(int initial_framesize, bool needs_stack_repair) {
6037 if (needs_stack_repair) {
6038 // Remove the extension of the caller's frame used for inline type unpacking
6039 //
6040 // Right now the stack looks like this:
6041 //
6042 // | Arguments from caller |
6043 // |---------------------------| <-- caller's SP
6044 // | Saved LR #1 |
6045 // | Saved FP #1 |
6046 // |---------------------------|
6047 // | Extension space for |
6048 // | inline arg (un)packing |
6049 // |---------------------------| <-- start of this method's frame
6050 // | Saved LR #2 |
6051 // | Saved FP #2 |
6052 // |---------------------------| <-- FP
6053 // | sp_inc |
6054 // | method locals |
6055 // |---------------------------| <-- SP
6056 //
6057 // There are two copies of FP and LR on the stack. They will be identical
6058 // unless the caller has been deoptimized, in which case LR #1 will be patched
6059 // to point at the deopt blob, and LR #2 will still point into the old method.
6060 //
6061 // The sp_inc stack slot holds the total size of the frame including the
6062 // extension space minus two words for the saved FP and LR.
6063
6064 int sp_inc_offset = initial_framesize - 3 * wordSize; // Immediately below saved LR and FP
6065
6066 ldr(rscratch1, Address(sp, sp_inc_offset));
6067 add(sp, sp, rscratch1);
6068 ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
6069 } else {
6070 remove_frame(initial_framesize);
6071 }
6072 }
6073
6074 void MacroAssembler::save_stack_increment(int sp_inc, int frame_size) {
6075 int real_frame_size = frame_size + sp_inc;
6076 assert(sp_inc == 0 || sp_inc > 2*wordSize, "invalid sp_inc value");
6077 assert(real_frame_size >= 2*wordSize, "frame size must include FP/LR space");
6078 assert((real_frame_size & (StackAlignmentInBytes-1)) == 0, "frame size not aligned");
6079
6080 int sp_inc_offset = frame_size - 3 * wordSize; // Immediately below saved LR and FP
6081
6082 // Subtract two words for the saved FP and LR as these will be popped
6083 // separately. See remove_frame above.
6084 mov(rscratch1, real_frame_size - 2*wordSize);
6085 str(rscratch1, Address(sp, sp_inc_offset));
6086 }
6087
6088 // This method counts leading positive bytes (highest bit not set) in provided byte array
6089 address MacroAssembler::count_positives(Register ary1, Register len, Register result) {
6090 // Simple and most common case of aligned small array which is not at the
6091 // end of memory page is placed here. All other cases are in stub.
6092 Label LOOP, END, STUB, STUB_LONG, SET_RESULT, DONE;
6093 const uint64_t UPPER_BIT_MASK=0x8080808080808080;
6094 assert_different_registers(ary1, len, result);
6095
6096 mov(result, len);
6097 cmpw(len, 0);
6098 br(LE, DONE);
6099 cmpw(len, 4 * wordSize);
6100 br(GE, STUB_LONG); // size > 32 then go to stub
6101
6102 int shift = 64 - exact_log2(os::vm_page_size());
6103 lsl(rscratch1, ary1, shift);
6104 mov(rscratch2, (size_t)(4 * wordSize) << shift);
6105 adds(rscratch2, rscratch1, rscratch2); // At end of page?
6106 br(CS, STUB); // at the end of page then go to stub
6107 subs(len, len, wordSize);
6108 br(LT, END);
6109
6110 BIND(LOOP);
6111 ldr(rscratch1, Address(post(ary1, wordSize)));
6112 tst(rscratch1, UPPER_BIT_MASK);
6113 br(NE, SET_RESULT);
6114 subs(len, len, wordSize);
6115 br(GE, LOOP);
6116 cmpw(len, -wordSize);
6117 br(EQ, DONE);
6118
6119 BIND(END);
6120 ldr(rscratch1, Address(ary1));
6121 sub(rscratch2, zr, len, LSL, 3); // LSL 3 is to get bits from bytes
6122 lslv(rscratch1, rscratch1, rscratch2);
6123 tst(rscratch1, UPPER_BIT_MASK);
6124 br(NE, SET_RESULT);
6125 b(DONE);
6126
6127 BIND(STUB);
6128 RuntimeAddress count_pos = RuntimeAddress(StubRoutines::aarch64::count_positives());
6129 assert(count_pos.target() != nullptr, "count_positives stub has not been generated");
6130 address tpc1 = trampoline_call(count_pos);
6131 if (tpc1 == nullptr) {
6132 DEBUG_ONLY(reset_labels(STUB_LONG, SET_RESULT, DONE));
6133 postcond(pc() == badAddress);
6134 return nullptr;
6135 }
6136 b(DONE);
6137
6138 BIND(STUB_LONG);
6139 RuntimeAddress count_pos_long = RuntimeAddress(StubRoutines::aarch64::count_positives_long());
6140 assert(count_pos_long.target() != nullptr, "count_positives_long stub has not been generated");
6141 address tpc2 = trampoline_call(count_pos_long);
6142 if (tpc2 == nullptr) {
6143 DEBUG_ONLY(reset_labels(SET_RESULT, DONE));
6144 postcond(pc() == badAddress);
6145 return nullptr;
6146 }
6147 b(DONE);
6148
6149 BIND(SET_RESULT);
6150
6151 add(len, len, wordSize);
6152 sub(result, result, len);
6153
6154 BIND(DONE);
6155 postcond(pc() != badAddress);
6156 return pc();
6157 }
6158
6159 // Clobbers: rscratch1, rscratch2, rflags
6160 // May also clobber v0-v7 when (!UseSimpleArrayEquals && UseSIMDForArrayEquals)
6161 address MacroAssembler::arrays_equals(Register a1, Register a2, Register tmp3,
6162 Register tmp4, Register tmp5, Register result,
6163 Register cnt1, int elem_size) {
6164 Label DONE, SAME;
6165 Register tmp1 = rscratch1;
6166 Register tmp2 = rscratch2;
6167 int elem_per_word = wordSize/elem_size;
6168 int log_elem_size = exact_log2(elem_size);
6169 int klass_offset = arrayOopDesc::klass_offset_in_bytes();
6170 int length_offset = arrayOopDesc::length_offset_in_bytes();
6171 int base_offset
6172 = arrayOopDesc::base_offset_in_bytes(elem_size == 2 ? T_CHAR : T_BYTE);
6173 // When the length offset is not aligned to 8 bytes,
6174 // then we align it down. This is valid because the new
6175 // offset will always be the klass which is the same
6176 // for type arrays.
6177 int start_offset = align_down(length_offset, BytesPerWord);
6178 int extra_length = base_offset - start_offset;
6179 assert(start_offset == length_offset || start_offset == klass_offset,
6180 "start offset must be 8-byte-aligned or be the klass offset");
6181 assert(base_offset != start_offset, "must include the length field");
6182 extra_length = extra_length / elem_size; // We count in elements, not bytes.
6183 int stubBytesThreshold = 3 * 64 + (UseSIMDForArrayEquals ? 0 : 16);
6184
6185 assert(elem_size == 1 || elem_size == 2, "must be char or byte");
6186 assert_different_registers(a1, a2, result, cnt1, rscratch1, rscratch2);
6187
6188 #ifndef PRODUCT
6189 {
6190 const char kind = (elem_size == 2) ? 'U' : 'L';
6191 char comment[64];
6192 snprintf(comment, sizeof comment, "array_equals%c{", kind);
6193 BLOCK_COMMENT(comment);
6194 }
6195 #endif
6196
6197 // if (a1 == a2)
6198 // return true;
6199 cmpoop(a1, a2); // May have read barriers for a1 and a2.
6200 br(EQ, SAME);
6201
6202 if (UseSimpleArrayEquals) {
6203 Label NEXT_WORD, SHORT, TAIL03, TAIL01, A_MIGHT_BE_NULL, A_IS_NOT_NULL;
6204 // if (a1 == nullptr || a2 == nullptr)
6205 // return false;
6206 // a1 & a2 == 0 means (some-pointer is null) or
6207 // (very-rare-or-even-probably-impossible-pointer-values)
6208 // so, we can save one branch in most cases
6209 tst(a1, a2);
6210 mov(result, false);
6211 br(EQ, A_MIGHT_BE_NULL);
6212 // if (a1.length != a2.length)
6213 // return false;
6214 bind(A_IS_NOT_NULL);
6215 ldrw(cnt1, Address(a1, length_offset));
6216 // Increase loop counter by diff between base- and actual start-offset.
6217 addw(cnt1, cnt1, extra_length);
6218 lea(a1, Address(a1, start_offset));
6219 lea(a2, Address(a2, start_offset));
6220 // Check for short strings, i.e. smaller than wordSize.
6221 subs(cnt1, cnt1, elem_per_word);
6222 br(Assembler::LT, SHORT);
6223 // Main 8 byte comparison loop.
6224 bind(NEXT_WORD); {
6225 ldr(tmp1, Address(post(a1, wordSize)));
6226 ldr(tmp2, Address(post(a2, wordSize)));
6227 subs(cnt1, cnt1, elem_per_word);
6228 eor(tmp5, tmp1, tmp2);
6229 cbnz(tmp5, DONE);
6230 } br(GT, NEXT_WORD);
6231 // Last longword. In the case where length == 4 we compare the
6232 // same longword twice, but that's still faster than another
6233 // conditional branch.
6234 // cnt1 could be 0, -1, -2, -3, -4 for chars; -4 only happens when
6235 // length == 4.
6236 if (log_elem_size > 0)
6237 lsl(cnt1, cnt1, log_elem_size);
6238 ldr(tmp3, Address(a1, cnt1));
6239 ldr(tmp4, Address(a2, cnt1));
6240 eor(tmp5, tmp3, tmp4);
6241 cbnz(tmp5, DONE);
6242 b(SAME);
6243 bind(A_MIGHT_BE_NULL);
6244 // in case both a1 and a2 are not-null, proceed with loads
6245 cbz(a1, DONE);
6246 cbz(a2, DONE);
6247 b(A_IS_NOT_NULL);
6248 bind(SHORT);
6249
6250 tbz(cnt1, 2 - log_elem_size, TAIL03); // 0-7 bytes left.
6251 {
6252 ldrw(tmp1, Address(post(a1, 4)));
6253 ldrw(tmp2, Address(post(a2, 4)));
6254 eorw(tmp5, tmp1, tmp2);
6255 cbnzw(tmp5, DONE);
6256 }
6257 bind(TAIL03);
6258 tbz(cnt1, 1 - log_elem_size, TAIL01); // 0-3 bytes left.
6259 {
6260 ldrh(tmp3, Address(post(a1, 2)));
6261 ldrh(tmp4, Address(post(a2, 2)));
6262 eorw(tmp5, tmp3, tmp4);
6263 cbnzw(tmp5, DONE);
6264 }
6265 bind(TAIL01);
6266 if (elem_size == 1) { // Only needed when comparing byte arrays.
6267 tbz(cnt1, 0, SAME); // 0-1 bytes left.
6268 {
6269 ldrb(tmp1, a1);
6270 ldrb(tmp2, a2);
6271 eorw(tmp5, tmp1, tmp2);
6272 cbnzw(tmp5, DONE);
6273 }
6274 }
6275 } else {
6276 Label NEXT_DWORD, SHORT, TAIL, TAIL2, STUB,
6277 CSET_EQ, LAST_CHECK;
6278 mov(result, false);
6279 cbz(a1, DONE);
6280 ldrw(cnt1, Address(a1, length_offset));
6281 cbz(a2, DONE);
6282 // Increase loop counter by diff between base- and actual start-offset.
6283 addw(cnt1, cnt1, extra_length);
6284
6285 // on most CPUs a2 is still "locked"(surprisingly) in ldrw and it's
6286 // faster to perform another branch before comparing a1 and a2
6287 cmp(cnt1, (u1)elem_per_word);
6288 br(LE, SHORT); // short or same
6289 ldr(tmp3, Address(pre(a1, start_offset)));
6290 subs(zr, cnt1, stubBytesThreshold);
6291 br(GE, STUB);
6292 ldr(tmp4, Address(pre(a2, start_offset)));
6293 sub(tmp5, zr, cnt1, LSL, 3 + log_elem_size);
6294
6295 // Main 16 byte comparison loop with 2 exits
6296 bind(NEXT_DWORD); {
6297 ldr(tmp1, Address(pre(a1, wordSize)));
6298 ldr(tmp2, Address(pre(a2, wordSize)));
6299 subs(cnt1, cnt1, 2 * elem_per_word);
6300 br(LE, TAIL);
6301 eor(tmp4, tmp3, tmp4);
6302 cbnz(tmp4, DONE);
6303 ldr(tmp3, Address(pre(a1, wordSize)));
6304 ldr(tmp4, Address(pre(a2, wordSize)));
6305 cmp(cnt1, (u1)elem_per_word);
6306 br(LE, TAIL2);
6307 cmp(tmp1, tmp2);
6308 } br(EQ, NEXT_DWORD);
6309 b(DONE);
6310
6311 bind(TAIL);
6312 eor(tmp4, tmp3, tmp4);
6313 eor(tmp2, tmp1, tmp2);
6314 lslv(tmp2, tmp2, tmp5);
6315 orr(tmp5, tmp4, tmp2);
6316 cmp(tmp5, zr);
6317 b(CSET_EQ);
6318
6319 bind(TAIL2);
6320 eor(tmp2, tmp1, tmp2);
6321 cbnz(tmp2, DONE);
6322 b(LAST_CHECK);
6323
6324 bind(STUB);
6325 ldr(tmp4, Address(pre(a2, start_offset)));
6326 if (elem_size == 2) { // convert to byte counter
6327 lsl(cnt1, cnt1, 1);
6328 }
6329 eor(tmp5, tmp3, tmp4);
6330 cbnz(tmp5, DONE);
6331 RuntimeAddress stub = RuntimeAddress(StubRoutines::aarch64::large_array_equals());
6332 assert(stub.target() != nullptr, "array_equals_long stub has not been generated");
6333 address tpc = trampoline_call(stub);
6334 if (tpc == nullptr) {
6335 DEBUG_ONLY(reset_labels(SHORT, LAST_CHECK, CSET_EQ, SAME, DONE));
6336 postcond(pc() == badAddress);
6337 return nullptr;
6338 }
6339 b(DONE);
6340
6341 // (a1 != null && a2 == null) || (a1 != null && a2 != null && a1 == a2)
6342 // so, if a2 == null => return false(0), else return true, so we can return a2
6343 mov(result, a2);
6344 b(DONE);
6345 bind(SHORT);
6346 sub(tmp5, zr, cnt1, LSL, 3 + log_elem_size);
6347 ldr(tmp3, Address(a1, start_offset));
6348 ldr(tmp4, Address(a2, start_offset));
6349 bind(LAST_CHECK);
6350 eor(tmp4, tmp3, tmp4);
6351 lslv(tmp5, tmp4, tmp5);
6352 cmp(tmp5, zr);
6353 bind(CSET_EQ);
6354 cset(result, EQ);
6355 b(DONE);
6356 }
6357
6358 bind(SAME);
6359 mov(result, true);
6360 // That's it.
6361 bind(DONE);
6362
6363 BLOCK_COMMENT("} array_equals");
6364 postcond(pc() != badAddress);
6365 return pc();
6366 }
6367
6368 // Compare Strings
6369
6370 // For Strings we're passed the address of the first characters in a1
6371 // and a2 and the length in cnt1.
6372 // There are two implementations. For arrays >= 8 bytes, all
6373 // comparisons (including the final one, which may overlap) are
6374 // performed 8 bytes at a time. For strings < 8 bytes, we compare a
6375 // halfword, then a short, and then a byte.
6376
6377 void MacroAssembler::string_equals(Register a1, Register a2,
6378 Register result, Register cnt1)
6379 {
6380 Label SAME, DONE, SHORT, NEXT_WORD;
6381 Register tmp1 = rscratch1;
6382 Register tmp2 = rscratch2;
6383 Register cnt2 = tmp2; // cnt2 only used in array length compare
6384
6385 assert_different_registers(a1, a2, result, cnt1, rscratch1, rscratch2);
6386
6387 #ifndef PRODUCT
6388 {
6389 char comment[64];
6390 snprintf(comment, sizeof comment, "{string_equalsL");
6391 BLOCK_COMMENT(comment);
6392 }
6393 #endif
6394
6395 mov(result, false);
6396
6397 // Check for short strings, i.e. smaller than wordSize.
6398 subs(cnt1, cnt1, wordSize);
6399 br(Assembler::LT, SHORT);
6400 // Main 8 byte comparison loop.
6401 bind(NEXT_WORD); {
6402 ldr(tmp1, Address(post(a1, wordSize)));
6403 ldr(tmp2, Address(post(a2, wordSize)));
6404 subs(cnt1, cnt1, wordSize);
6405 eor(tmp1, tmp1, tmp2);
6406 cbnz(tmp1, DONE);
6407 } br(GT, NEXT_WORD);
6408 // Last longword. In the case where length == 4 we compare the
6409 // same longword twice, but that's still faster than another
6410 // conditional branch.
6411 // cnt1 could be 0, -1, -2, -3, -4 for chars; -4 only happens when
6412 // length == 4.
6413 ldr(tmp1, Address(a1, cnt1));
6414 ldr(tmp2, Address(a2, cnt1));
6415 eor(tmp2, tmp1, tmp2);
6416 cbnz(tmp2, DONE);
6417 b(SAME);
6418
6419 bind(SHORT);
6420 Label TAIL03, TAIL01;
6421
6422 tbz(cnt1, 2, TAIL03); // 0-7 bytes left.
6423 {
6424 ldrw(tmp1, Address(post(a1, 4)));
6425 ldrw(tmp2, Address(post(a2, 4)));
6426 eorw(tmp1, tmp1, tmp2);
6427 cbnzw(tmp1, DONE);
6428 }
6429 bind(TAIL03);
6430 tbz(cnt1, 1, TAIL01); // 0-3 bytes left.
6431 {
6432 ldrh(tmp1, Address(post(a1, 2)));
6433 ldrh(tmp2, Address(post(a2, 2)));
6434 eorw(tmp1, tmp1, tmp2);
6435 cbnzw(tmp1, DONE);
6436 }
6437 bind(TAIL01);
6438 tbz(cnt1, 0, SAME); // 0-1 bytes left.
6439 {
6440 ldrb(tmp1, a1);
6441 ldrb(tmp2, a2);
6442 eorw(tmp1, tmp1, tmp2);
6443 cbnzw(tmp1, DONE);
6444 }
6445 // Arrays are equal.
6446 bind(SAME);
6447 mov(result, true);
6448
6449 // That's it.
6450 bind(DONE);
6451 BLOCK_COMMENT("} string_equals");
6452 }
6453
6454
6455 // The size of the blocks erased by the zero_blocks stub. We must
6456 // handle anything smaller than this ourselves in zero_words().
6457 const int MacroAssembler::zero_words_block_size = 8;
6458
6459 // zero_words() is used by C2 ClearArray patterns and by
6460 // C1_MacroAssembler. It is as small as possible, handling small word
6461 // counts locally and delegating anything larger to the zero_blocks
6462 // stub. It is expanded many times in compiled code, so it is
6463 // important to keep it short.
6464
6465 // ptr: Address of a buffer to be zeroed.
6466 // cnt: Count in HeapWords.
6467 //
6468 // ptr, cnt, rscratch1, and rscratch2 are clobbered.
6469 address MacroAssembler::zero_words(Register ptr, Register cnt)
6470 {
6471 assert(is_power_of_2(zero_words_block_size), "adjust this");
6472
6473 BLOCK_COMMENT("zero_words {");
6474 assert(ptr == r10 && cnt == r11, "mismatch in register usage");
6475 RuntimeAddress zero_blocks = RuntimeAddress(StubRoutines::aarch64::zero_blocks());
6476 assert(zero_blocks.target() != nullptr, "zero_blocks stub has not been generated");
6477
6478 subs(rscratch1, cnt, zero_words_block_size);
6479 Label around;
6480 br(LO, around);
6481 {
6482 RuntimeAddress zero_blocks = RuntimeAddress(StubRoutines::aarch64::zero_blocks());
6483 assert(zero_blocks.target() != nullptr, "zero_blocks stub has not been generated");
6484 // Make sure this is a C2 compilation. C1 allocates space only for
6485 // trampoline stubs generated by Call LIR ops, and in any case it
6486 // makes sense for a C1 compilation task to proceed as quickly as
6487 // possible.
6488 CompileTask* task;
6489 if (StubRoutines::aarch64::complete()
6490 && Thread::current()->is_Compiler_thread()
6491 && (task = ciEnv::current()->task())
6492 && is_c2_compile(task->comp_level())) {
6493 address tpc = trampoline_call(zero_blocks);
6494 if (tpc == nullptr) {
6495 DEBUG_ONLY(reset_labels(around));
6496 return nullptr;
6497 }
6498 } else {
6499 far_call(zero_blocks);
6500 }
6501 }
6502 bind(around);
6503
6504 // We have a few words left to do. zero_blocks has adjusted r10 and r11
6505 // for us.
6506 for (int i = zero_words_block_size >> 1; i > 1; i >>= 1) {
6507 Label l;
6508 tbz(cnt, exact_log2(i), l);
6509 for (int j = 0; j < i; j += 2) {
6510 stp(zr, zr, post(ptr, 2 * BytesPerWord));
6511 }
6512 bind(l);
6513 }
6514 {
6515 Label l;
6516 tbz(cnt, 0, l);
6517 str(zr, Address(ptr));
6518 bind(l);
6519 }
6520
6521 BLOCK_COMMENT("} zero_words");
6522 return pc();
6523 }
6524
6525 // base: Address of a buffer to be zeroed, 8 bytes aligned.
6526 // cnt: Immediate count in HeapWords.
6527 //
6528 // r10, r11, rscratch1, and rscratch2 are clobbered.
6529 address MacroAssembler::zero_words(Register base, uint64_t cnt)
6530 {
6531 assert(wordSize <= BlockZeroingLowLimit,
6532 "increase BlockZeroingLowLimit");
6533 address result = nullptr;
6534 if (cnt <= (uint64_t)BlockZeroingLowLimit / BytesPerWord) {
6535 #ifndef PRODUCT
6536 {
6537 char buf[64];
6538 snprintf(buf, sizeof buf, "zero_words (count = %" PRIu64 ") {", cnt);
6539 BLOCK_COMMENT(buf);
6540 }
6541 #endif
6542 if (cnt >= 16) {
6543 uint64_t loops = cnt/16;
6544 if (loops > 1) {
6545 mov(rscratch2, loops - 1);
6546 }
6547 {
6548 Label loop;
6549 bind(loop);
6550 for (int i = 0; i < 16; i += 2) {
6551 stp(zr, zr, Address(base, i * BytesPerWord));
6552 }
6553 add(base, base, 16 * BytesPerWord);
6554 if (loops > 1) {
6555 subs(rscratch2, rscratch2, 1);
6556 br(GE, loop);
6557 }
6558 }
6559 }
6560 cnt %= 16;
6561 int i = cnt & 1; // store any odd word to start
6562 if (i) str(zr, Address(base));
6563 for (; i < (int)cnt; i += 2) {
6564 stp(zr, zr, Address(base, i * wordSize));
6565 }
6566 BLOCK_COMMENT("} zero_words");
6567 result = pc();
6568 } else {
6569 mov(r10, base); mov(r11, cnt);
6570 result = zero_words(r10, r11);
6571 }
6572 return result;
6573 }
6574
6575 // Zero blocks of memory by using DC ZVA.
6576 //
6577 // Aligns the base address first sufficiently for DC ZVA, then uses
6578 // DC ZVA repeatedly for every full block. cnt is the size to be
6579 // zeroed in HeapWords. Returns the count of words left to be zeroed
6580 // in cnt.
6581 //
6582 // NOTE: This is intended to be used in the zero_blocks() stub. If
6583 // you want to use it elsewhere, note that cnt must be >= 2*zva_length.
6584 void MacroAssembler::zero_dcache_blocks(Register base, Register cnt) {
6585 Register tmp = rscratch1;
6586 Register tmp2 = rscratch2;
6587 int zva_length = VM_Version::zva_length();
6588 Label initial_table_end, loop_zva;
6589 Label fini;
6590
6591 // Base must be 16 byte aligned. If not just return and let caller handle it
6592 tst(base, 0x0f);
6593 br(Assembler::NE, fini);
6594 // Align base with ZVA length.
6595 neg(tmp, base);
6596 andr(tmp, tmp, zva_length - 1);
6597
6598 // tmp: the number of bytes to be filled to align the base with ZVA length.
6599 add(base, base, tmp);
6600 sub(cnt, cnt, tmp, Assembler::ASR, 3);
6601 adr(tmp2, initial_table_end);
6602 sub(tmp2, tmp2, tmp, Assembler::LSR, 2);
6603 br(tmp2);
6604
6605 for (int i = -zva_length + 16; i < 0; i += 16)
6606 stp(zr, zr, Address(base, i));
6607 bind(initial_table_end);
6608
6609 sub(cnt, cnt, zva_length >> 3);
6610 bind(loop_zva);
6611 dc(Assembler::ZVA, base);
6612 subs(cnt, cnt, zva_length >> 3);
6613 add(base, base, zva_length);
6614 br(Assembler::GE, loop_zva);
6615 add(cnt, cnt, zva_length >> 3); // count not zeroed by DC ZVA
6616 bind(fini);
6617 }
6618
6619 // base: Address of a buffer to be filled, 8 bytes aligned.
6620 // cnt: Count in 8-byte unit.
6621 // value: Value to be filled with.
6622 // base will point to the end of the buffer after filling.
6623 void MacroAssembler::fill_words(Register base, Register cnt, Register value)
6624 {
6625 // Algorithm:
6626 //
6627 // if (cnt == 0) {
6628 // return;
6629 // }
6630 // if ((p & 8) != 0) {
6631 // *p++ = v;
6632 // }
6633 //
6634 // scratch1 = cnt & 14;
6635 // cnt -= scratch1;
6636 // p += scratch1;
6637 // switch (scratch1 / 2) {
6638 // do {
6639 // cnt -= 16;
6640 // p[-16] = v;
6641 // p[-15] = v;
6642 // case 7:
6643 // p[-14] = v;
6644 // p[-13] = v;
6645 // case 6:
6646 // p[-12] = v;
6647 // p[-11] = v;
6648 // // ...
6649 // case 1:
6650 // p[-2] = v;
6651 // p[-1] = v;
6652 // case 0:
6653 // p += 16;
6654 // } while (cnt);
6655 // }
6656 // if ((cnt & 1) == 1) {
6657 // *p++ = v;
6658 // }
6659
6660 assert_different_registers(base, cnt, value, rscratch1, rscratch2);
6661
6662 Label fini, skip, entry, loop;
6663 const int unroll = 8; // Number of stp instructions we'll unroll
6664
6665 cbz(cnt, fini);
6666 tbz(base, 3, skip);
6667 str(value, Address(post(base, 8)));
6668 sub(cnt, cnt, 1);
6669 bind(skip);
6670
6671 andr(rscratch1, cnt, (unroll-1) * 2);
6672 sub(cnt, cnt, rscratch1);
6673 add(base, base, rscratch1, Assembler::LSL, 3);
6674 adr(rscratch2, entry);
6675 sub(rscratch2, rscratch2, rscratch1, Assembler::LSL, 1);
6676 br(rscratch2);
6677
6678 bind(loop);
6679 add(base, base, unroll * 16);
6680 for (int i = -unroll; i < 0; i++)
6681 stp(value, value, Address(base, i * 16));
6682 bind(entry);
6683 subs(cnt, cnt, unroll * 2);
6684 br(Assembler::GE, loop);
6685
6686 tbz(cnt, 0, fini);
6687 str(value, Address(post(base, 8)));
6688 bind(fini);
6689 }
6690
6691 // Intrinsic for
6692 //
6693 // - sun/nio/cs/ISO_8859_1$Encoder.implEncodeISOArray
6694 // return the number of characters copied.
6695 // - java/lang/StringUTF16.compress
6696 // return index of non-latin1 character if copy fails, otherwise 'len'.
6697 //
6698 // This version always returns the number of characters copied, and does not
6699 // clobber the 'len' register. A successful copy will complete with the post-
6700 // condition: 'res' == 'len', while an unsuccessful copy will exit with the
6701 // post-condition: 0 <= 'res' < 'len'.
6702 //
6703 // NOTE: Attempts to use 'ld2' (and 'umaxv' in the ISO part) has proven to
6704 // degrade performance (on Ampere Altra - Neoverse N1), to an extent
6705 // beyond the acceptable, even though the footprint would be smaller.
6706 // Using 'umaxv' in the ASCII-case comes with a small penalty but does
6707 // avoid additional bloat.
6708 //
6709 // Clobbers: src, dst, res, rscratch1, rscratch2, rflags
6710 void MacroAssembler::encode_iso_array(Register src, Register dst,
6711 Register len, Register res, bool ascii,
6712 FloatRegister vtmp0, FloatRegister vtmp1,
6713 FloatRegister vtmp2, FloatRegister vtmp3,
6714 FloatRegister vtmp4, FloatRegister vtmp5)
6715 {
6716 Register cnt = res;
6717 Register max = rscratch1;
6718 Register chk = rscratch2;
6719
6720 prfm(Address(src), PLDL1STRM);
6721 movw(cnt, len);
6722
6723 #define ASCII(insn) do { if (ascii) { insn; } } while (0)
6724
6725 Label LOOP_32, DONE_32, FAIL_32;
6726
6727 BIND(LOOP_32);
6728 {
6729 cmpw(cnt, 32);
6730 br(LT, DONE_32);
6731 ld1(vtmp0, vtmp1, vtmp2, vtmp3, T8H, Address(post(src, 64)));
6732 // Extract lower bytes.
6733 FloatRegister vlo0 = vtmp4;
6734 FloatRegister vlo1 = vtmp5;
6735 uzp1(vlo0, T16B, vtmp0, vtmp1);
6736 uzp1(vlo1, T16B, vtmp2, vtmp3);
6737 // Merge bits...
6738 orr(vtmp0, T16B, vtmp0, vtmp1);
6739 orr(vtmp2, T16B, vtmp2, vtmp3);
6740 // Extract merged upper bytes.
6741 FloatRegister vhix = vtmp0;
6742 uzp2(vhix, T16B, vtmp0, vtmp2);
6743 // ISO-check on hi-parts (all zero).
6744 // ASCII-check on lo-parts (no sign).
6745 FloatRegister vlox = vtmp1; // Merge lower bytes.
6746 ASCII(orr(vlox, T16B, vlo0, vlo1));
6747 umov(chk, vhix, D, 1); ASCII(cm(LT, vlox, T16B, vlox));
6748 fmovd(max, vhix); ASCII(umaxv(vlox, T16B, vlox));
6749 orr(chk, chk, max); ASCII(umov(max, vlox, B, 0));
6750 ASCII(orr(chk, chk, max));
6751 cbnz(chk, FAIL_32);
6752 subw(cnt, cnt, 32);
6753 st1(vlo0, vlo1, T16B, Address(post(dst, 32)));
6754 b(LOOP_32);
6755 }
6756 BIND(FAIL_32);
6757 sub(src, src, 64);
6758 BIND(DONE_32);
6759
6760 Label LOOP_8, SKIP_8;
6761
6762 BIND(LOOP_8);
6763 {
6764 cmpw(cnt, 8);
6765 br(LT, SKIP_8);
6766 FloatRegister vhi = vtmp0;
6767 FloatRegister vlo = vtmp1;
6768 ld1(vtmp3, T8H, src);
6769 uzp1(vlo, T16B, vtmp3, vtmp3);
6770 uzp2(vhi, T16B, vtmp3, vtmp3);
6771 // ISO-check on hi-parts (all zero).
6772 // ASCII-check on lo-parts (no sign).
6773 ASCII(cm(LT, vtmp2, T16B, vlo));
6774 fmovd(chk, vhi); ASCII(umaxv(vtmp2, T16B, vtmp2));
6775 ASCII(umov(max, vtmp2, B, 0));
6776 ASCII(orr(chk, chk, max));
6777 cbnz(chk, SKIP_8);
6778
6779 strd(vlo, Address(post(dst, 8)));
6780 subw(cnt, cnt, 8);
6781 add(src, src, 16);
6782 b(LOOP_8);
6783 }
6784 BIND(SKIP_8);
6785
6786 #undef ASCII
6787
6788 Label LOOP, DONE;
6789
6790 cbz(cnt, DONE);
6791 BIND(LOOP);
6792 {
6793 Register chr = rscratch1;
6794 ldrh(chr, Address(post(src, 2)));
6795 tst(chr, ascii ? 0xff80 : 0xff00);
6796 br(NE, DONE);
6797 strb(chr, Address(post(dst, 1)));
6798 subs(cnt, cnt, 1);
6799 br(GT, LOOP);
6800 }
6801 BIND(DONE);
6802 // Return index where we stopped.
6803 subw(res, len, cnt);
6804 }
6805
6806 // Inflate byte[] array to char[].
6807 // Clobbers: src, dst, len, rflags, rscratch1, v0-v6
6808 address MacroAssembler::byte_array_inflate(Register src, Register dst, Register len,
6809 FloatRegister vtmp1, FloatRegister vtmp2,
6810 FloatRegister vtmp3, Register tmp4) {
6811 Label big, done, after_init, to_stub;
6812
6813 assert_different_registers(src, dst, len, tmp4, rscratch1);
6814
6815 fmovd(vtmp1, 0.0);
6816 lsrw(tmp4, len, 3);
6817 bind(after_init);
6818 cbnzw(tmp4, big);
6819 // Short string: less than 8 bytes.
6820 {
6821 Label loop, tiny;
6822
6823 cmpw(len, 4);
6824 br(LT, tiny);
6825 // Use SIMD to do 4 bytes.
6826 ldrs(vtmp2, post(src, 4));
6827 zip1(vtmp3, T8B, vtmp2, vtmp1);
6828 subw(len, len, 4);
6829 strd(vtmp3, post(dst, 8));
6830
6831 cbzw(len, done);
6832
6833 // Do the remaining bytes by steam.
6834 bind(loop);
6835 ldrb(tmp4, post(src, 1));
6836 strh(tmp4, post(dst, 2));
6837 subw(len, len, 1);
6838
6839 bind(tiny);
6840 cbnz(len, loop);
6841
6842 b(done);
6843 }
6844
6845 if (SoftwarePrefetchHintDistance >= 0) {
6846 bind(to_stub);
6847 RuntimeAddress stub = RuntimeAddress(StubRoutines::aarch64::large_byte_array_inflate());
6848 assert(stub.target() != nullptr, "large_byte_array_inflate stub has not been generated");
6849 address tpc = trampoline_call(stub);
6850 if (tpc == nullptr) {
6851 DEBUG_ONLY(reset_labels(big, done));
6852 postcond(pc() == badAddress);
6853 return nullptr;
6854 }
6855 b(after_init);
6856 }
6857
6858 // Unpack the bytes 8 at a time.
6859 bind(big);
6860 {
6861 Label loop, around, loop_last, loop_start;
6862
6863 if (SoftwarePrefetchHintDistance >= 0) {
6864 const int large_loop_threshold = (64 + 16)/8;
6865 ldrd(vtmp2, post(src, 8));
6866 andw(len, len, 7);
6867 cmp(tmp4, (u1)large_loop_threshold);
6868 br(GE, to_stub);
6869 b(loop_start);
6870
6871 bind(loop);
6872 ldrd(vtmp2, post(src, 8));
6873 bind(loop_start);
6874 subs(tmp4, tmp4, 1);
6875 br(EQ, loop_last);
6876 zip1(vtmp2, T16B, vtmp2, vtmp1);
6877 ldrd(vtmp3, post(src, 8));
6878 st1(vtmp2, T8H, post(dst, 16));
6879 subs(tmp4, tmp4, 1);
6880 zip1(vtmp3, T16B, vtmp3, vtmp1);
6881 st1(vtmp3, T8H, post(dst, 16));
6882 br(NE, loop);
6883 b(around);
6884 bind(loop_last);
6885 zip1(vtmp2, T16B, vtmp2, vtmp1);
6886 st1(vtmp2, T8H, post(dst, 16));
6887 bind(around);
6888 cbz(len, done);
6889 } else {
6890 andw(len, len, 7);
6891 bind(loop);
6892 ldrd(vtmp2, post(src, 8));
6893 sub(tmp4, tmp4, 1);
6894 zip1(vtmp3, T16B, vtmp2, vtmp1);
6895 st1(vtmp3, T8H, post(dst, 16));
6896 cbnz(tmp4, loop);
6897 }
6898 }
6899
6900 // Do the tail of up to 8 bytes.
6901 add(src, src, len);
6902 ldrd(vtmp3, Address(src, -8));
6903 add(dst, dst, len, ext::uxtw, 1);
6904 zip1(vtmp3, T16B, vtmp3, vtmp1);
6905 strq(vtmp3, Address(dst, -16));
6906
6907 bind(done);
6908 postcond(pc() != badAddress);
6909 return pc();
6910 }
6911
6912 // Compress char[] array to byte[].
6913 // Intrinsic for java.lang.StringUTF16.compress(char[] src, int srcOff, byte[] dst, int dstOff, int len)
6914 // Return the array length if every element in array can be encoded,
6915 // otherwise, the index of first non-latin1 (> 0xff) character.
6916 void MacroAssembler::char_array_compress(Register src, Register dst, Register len,
6917 Register res,
6918 FloatRegister tmp0, FloatRegister tmp1,
6919 FloatRegister tmp2, FloatRegister tmp3,
6920 FloatRegister tmp4, FloatRegister tmp5) {
6921 encode_iso_array(src, dst, len, res, false, tmp0, tmp1, tmp2, tmp3, tmp4, tmp5);
6922 }
6923
6924 // java.math.round(double a)
6925 // Returns the closest long to the argument, with ties rounding to
6926 // positive infinity. This requires some fiddling for corner
6927 // cases. We take care to avoid double rounding in e.g. (jlong)(a + 0.5).
6928 void MacroAssembler::java_round_double(Register dst, FloatRegister src,
6929 FloatRegister ftmp) {
6930 Label DONE;
6931 BLOCK_COMMENT("java_round_double: { ");
6932 fmovd(rscratch1, src);
6933 // Use RoundToNearestTiesAway unless src small and -ve.
6934 fcvtasd(dst, src);
6935 // Test if src >= 0 || abs(src) >= 0x1.0p52
6936 eor(rscratch1, rscratch1, UCONST64(1) << 63); // flip sign bit
6937 mov(rscratch2, julong_cast(0x1.0p52));
6938 cmp(rscratch1, rscratch2);
6939 br(HS, DONE); {
6940 // src < 0 && abs(src) < 0x1.0p52
6941 // src may have a fractional part, so add 0.5
6942 fmovd(ftmp, 0.5);
6943 faddd(ftmp, src, ftmp);
6944 // Convert double to jlong, use RoundTowardsNegative
6945 fcvtmsd(dst, ftmp);
6946 }
6947 bind(DONE);
6948 BLOCK_COMMENT("} java_round_double");
6949 }
6950
6951 void MacroAssembler::java_round_float(Register dst, FloatRegister src,
6952 FloatRegister ftmp) {
6953 Label DONE;
6954 BLOCK_COMMENT("java_round_float: { ");
6955 fmovs(rscratch1, src);
6956 // Use RoundToNearestTiesAway unless src small and -ve.
6957 fcvtassw(dst, src);
6958 // Test if src >= 0 || abs(src) >= 0x1.0p23
6959 eor(rscratch1, rscratch1, 0x80000000); // flip sign bit
6960 mov(rscratch2, jint_cast(0x1.0p23f));
6961 cmp(rscratch1, rscratch2);
6962 br(HS, DONE); {
6963 // src < 0 && |src| < 0x1.0p23
6964 // src may have a fractional part, so add 0.5
6965 fmovs(ftmp, 0.5f);
6966 fadds(ftmp, src, ftmp);
6967 // Convert float to jint, use RoundTowardsNegative
6968 fcvtmssw(dst, ftmp);
6969 }
6970 bind(DONE);
6971 BLOCK_COMMENT("} java_round_float");
6972 }
6973
6974 // get_thread() can be called anywhere inside generated code so we
6975 // need to save whatever non-callee save context might get clobbered
6976 // by the call to JavaThread::aarch64_get_thread_helper() or, indeed,
6977 // the call setup code.
6978 //
6979 // On Linux, aarch64_get_thread_helper() clobbers only r0, r1, and flags.
6980 // On other systems, the helper is a usual C function.
6981 //
6982 void MacroAssembler::get_thread(Register dst) {
6983 RegSet saved_regs =
6984 LINUX_ONLY(RegSet::range(r0, r1) + lr - dst)
6985 NOT_LINUX (RegSet::range(r0, r17) + lr - dst);
6986
6987 protect_return_address();
6988 push(saved_regs, sp);
6989
6990 mov(lr, CAST_FROM_FN_PTR(address, JavaThread::aarch64_get_thread_helper));
6991 blr(lr);
6992 if (dst != c_rarg0) {
6993 mov(dst, c_rarg0);
6994 }
6995
6996 pop(saved_regs, sp);
6997 authenticate_return_address();
6998 }
6999
7000 #ifdef COMPILER2
7001 // C2 compiled method's prolog code
7002 // Moved here from aarch64.ad to support Valhalla code belows
7003 void MacroAssembler::verified_entry(Compile* C, int sp_inc) {
7004 if (C->clinit_barrier_on_entry()) {
7005 assert(!C->method()->holder()->is_not_initialized(), "initialization should have been started");
7006
7007 Label L_skip_barrier;
7008
7009 mov_metadata(rscratch2, C->method()->holder()->constant_encoding());
7010 clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
7011 far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
7012 bind(L_skip_barrier);
7013 }
7014
7015 if (C->max_vector_size() > 0) {
7016 reinitialize_ptrue();
7017 }
7018
7019 int bangsize = C->output()->bang_size_in_bytes();
7020 if (C->output()->need_stack_bang(bangsize))
7021 generate_stack_overflow_check(bangsize);
7022
7023 // n.b. frame size includes space for return pc and rfp
7024 const long framesize = C->output()->frame_size_in_bytes();
7025 build_frame(framesize);
7026
7027 if (C->needs_stack_repair()) {
7028 save_stack_increment(sp_inc, framesize);
7029 }
7030
7031 if (VerifyStackAtCalls) {
7032 Unimplemented();
7033 }
7034 }
7035 #endif // COMPILER2
7036
7037 int MacroAssembler::store_inline_type_fields_to_buf(ciInlineKlass* vk, bool from_interpreter) {
7038 assert(InlineTypeReturnedAsFields, "Inline types should never be returned as fields");
7039 // An inline type might be returned. If fields are in registers we
7040 // need to allocate an inline type instance and initialize it with
7041 // the value of the fields.
7042 Label skip;
7043 // We only need a new buffered inline type if a new one is not returned
7044 tbz(r0, 0, skip);
7045 int call_offset = -1;
7046
7047 // Be careful not to clobber r1-7 which hold returned fields
7048 // Also do not use callee-saved registers as these may be live in the interpreter
7049 Register tmp1 = r13, tmp2 = r14, klass = r15, r0_preserved = r12;
7050
7051 // The following code is similar to allocate_instance but has some slight differences,
7052 // e.g. object size is always not zero, sometimes it's constant; storing klass ptr after
7053 // allocating is not necessary if vk != nullptr, etc. allocate_instance is not aware of these.
7054 Label slow_case;
7055 // 1. Try to allocate a new buffered inline instance either from TLAB or eden space
7056 mov(r0_preserved, r0); // save r0 for slow_case since *_allocate may corrupt it when allocation failed
7057
7058 if (vk != nullptr) {
7059 // Called from C1, where the return type is statically known.
7060 movptr(klass, (intptr_t)vk->get_InlineKlass());
7061 jint lh = vk->layout_helper();
7062 assert(lh != Klass::_lh_neutral_value, "inline class in return type must have been resolved");
7063 if (UseTLAB && !Klass::layout_helper_needs_slow_path(lh)) {
7064 tlab_allocate(r0, noreg, lh, tmp1, tmp2, slow_case);
7065 } else {
7066 b(slow_case);
7067 }
7068 } else {
7069 // Call from interpreter. R0 contains ((the InlineKlass* of the return type) | 0x01)
7070 andr(klass, r0, -2);
7071 if (UseTLAB) {
7072 ldrw(tmp2, Address(klass, Klass::layout_helper_offset()));
7073 tst(tmp2, Klass::_lh_instance_slow_path_bit);
7074 br(Assembler::NE, slow_case);
7075 tlab_allocate(r0, tmp2, 0, tmp1, tmp2, slow_case);
7076 } else {
7077 b(slow_case);
7078 }
7079 }
7080 if (UseTLAB) {
7081 // 2. Initialize buffered inline instance header
7082 Register buffer_obj = r0;
7083 if (UseCompactObjectHeaders) {
7084 ldr(rscratch1, Address(klass, Klass::prototype_header_offset()));
7085 str(rscratch1, Address(buffer_obj, oopDesc::mark_offset_in_bytes()));
7086 } else {
7087 mov(rscratch1, (intptr_t)markWord::inline_type_prototype().value());
7088 str(rscratch1, Address(buffer_obj, oopDesc::mark_offset_in_bytes()));
7089 store_klass_gap(buffer_obj, zr);
7090 if (vk == nullptr) {
7091 // store_klass corrupts klass, so save it for later use (interpreter case only).
7092 mov(tmp1, klass);
7093 }
7094 store_klass(buffer_obj, klass);
7095 }
7096 // 3. Initialize its fields with an inline class specific handler
7097 if (vk != nullptr) {
7098 far_call(RuntimeAddress(vk->pack_handler())); // no need for call info as this will not safepoint.
7099 } else {
7100 // tmp1 holds klass preserved above
7101 ldr(tmp1, Address(tmp1, InstanceKlass::adr_inlineklass_fixed_block_offset()));
7102 ldr(tmp1, Address(tmp1, InlineKlass::pack_handler_offset()));
7103 blr(tmp1);
7104 }
7105
7106 membar(Assembler::StoreStore);
7107 b(skip);
7108 } else {
7109 // Must have already branched to slow_case above.
7110 DEBUG_ONLY(should_not_reach_here());
7111 }
7112 bind(slow_case);
7113 // We failed to allocate a new inline type, fall back to a runtime
7114 // call. Some oop field may be live in some registers but we can't
7115 // tell. That runtime call will take care of preserving them
7116 // across a GC if there's one.
7117 mov(r0, r0_preserved);
7118
7119 if (from_interpreter) {
7120 super_call_VM_leaf(StubRoutines::store_inline_type_fields_to_buf());
7121 } else {
7122 far_call(RuntimeAddress(StubRoutines::store_inline_type_fields_to_buf()));
7123 call_offset = offset();
7124 }
7125 membar(Assembler::StoreStore);
7126
7127 bind(skip);
7128 return call_offset;
7129 }
7130
7131 // Move a value between registers/stack slots and update the reg_state
7132 bool MacroAssembler::move_helper(VMReg from, VMReg to, BasicType bt, RegState reg_state[]) {
7133 assert(from->is_valid() && to->is_valid(), "source and destination must be valid");
7134 if (reg_state[to->value()] == reg_written) {
7135 return true; // Already written
7136 }
7137
7138 if (from != to && bt != T_VOID) {
7139 if (reg_state[to->value()] == reg_readonly) {
7140 return false; // Not yet writable
7141 }
7142 if (from->is_reg()) {
7143 if (to->is_reg()) {
7144 if (from->is_Register() && to->is_Register()) {
7145 mov(to->as_Register(), from->as_Register());
7146 } else if (from->is_FloatRegister() && to->is_FloatRegister()) {
7147 fmovd(to->as_FloatRegister(), from->as_FloatRegister());
7148 } else {
7149 ShouldNotReachHere();
7150 }
7151 } else {
7152 int st_off = to->reg2stack() * VMRegImpl::stack_slot_size;
7153 Address to_addr = Address(sp, st_off);
7154 if (from->is_FloatRegister()) {
7155 if (bt == T_DOUBLE) {
7156 strd(from->as_FloatRegister(), to_addr);
7157 } else {
7158 assert(bt == T_FLOAT, "must be float");
7159 strs(from->as_FloatRegister(), to_addr);
7160 }
7161 } else {
7162 str(from->as_Register(), to_addr);
7163 }
7164 }
7165 } else {
7166 Address from_addr = Address(sp, from->reg2stack() * VMRegImpl::stack_slot_size);
7167 if (to->is_reg()) {
7168 if (to->is_FloatRegister()) {
7169 if (bt == T_DOUBLE) {
7170 ldrd(to->as_FloatRegister(), from_addr);
7171 } else {
7172 assert(bt == T_FLOAT, "must be float");
7173 ldrs(to->as_FloatRegister(), from_addr);
7174 }
7175 } else {
7176 ldr(to->as_Register(), from_addr);
7177 }
7178 } else {
7179 int st_off = to->reg2stack() * VMRegImpl::stack_slot_size;
7180 ldr(rscratch1, from_addr);
7181 str(rscratch1, Address(sp, st_off));
7182 }
7183 }
7184 }
7185
7186 // Update register states
7187 reg_state[from->value()] = reg_writable;
7188 reg_state[to->value()] = reg_written;
7189 return true;
7190 }
7191
7192 // Calculate the extra stack space required for packing or unpacking inline
7193 // args and adjust the stack pointer
7194 int MacroAssembler::extend_stack_for_inline_args(int args_on_stack) {
7195 int sp_inc = args_on_stack * VMRegImpl::stack_slot_size;
7196 sp_inc = align_up(sp_inc, StackAlignmentInBytes);
7197 assert(sp_inc > 0, "sanity");
7198
7199 // Save a copy of the FP and LR here for deoptimization patching and frame walking
7200 stp(rfp, lr, Address(pre(sp, -2 * wordSize)));
7201
7202 // Adjust the stack pointer. This will be repaired on return by MacroAssembler::remove_frame
7203 if (sp_inc < (1 << 9)) {
7204 sub(sp, sp, sp_inc); // Fits in an immediate
7205 } else {
7206 mov(rscratch1, sp_inc);
7207 sub(sp, sp, rscratch1);
7208 }
7209
7210 return sp_inc + 2 * wordSize; // Account for the FP/LR space
7211 }
7212
7213 // Read all fields from an inline type oop and store the values in registers/stack slots
7214 bool MacroAssembler::unpack_inline_helper(const GrowableArray<SigEntry>* sig, int& sig_index,
7215 VMReg from, int& from_index, VMRegPair* to, int to_count, int& to_index,
7216 RegState reg_state[]) {
7217 assert(sig->at(sig_index)._bt == T_VOID, "should be at end delimiter");
7218 assert(from->is_valid(), "source must be valid");
7219 bool progress = false;
7220 #ifdef ASSERT
7221 const int start_offset = offset();
7222 #endif
7223
7224 Label L_null, L_notNull;
7225 // Don't use r14 as tmp because it's used for spilling (see MacroAssembler::spill_reg_for)
7226 Register tmp1 = r10;
7227 Register tmp2 = r11;
7228 Register fromReg = noreg;
7229 ScalarizedInlineArgsStream stream(sig, sig_index, to, to_count, to_index, -1);
7230 bool done = true;
7231 bool mark_done = true;
7232 VMReg toReg;
7233 BasicType bt;
7234 // Check if argument requires a null check
7235 bool null_check = false;
7236 VMReg nullCheckReg;
7237 while (stream.next(nullCheckReg, bt)) {
7238 if (sig->at(stream.sig_index())._offset == -1) {
7239 null_check = true;
7240 break;
7241 }
7242 }
7243 stream.reset(sig_index, to_index);
7244 while (stream.next(toReg, bt)) {
7245 assert(toReg->is_valid(), "destination must be valid");
7246 int idx = (int)toReg->value();
7247 if (reg_state[idx] == reg_readonly) {
7248 if (idx != from->value()) {
7249 mark_done = false;
7250 }
7251 done = false;
7252 continue;
7253 } else if (reg_state[idx] == reg_written) {
7254 continue;
7255 }
7256 assert(reg_state[idx] == reg_writable, "must be writable");
7257 reg_state[idx] = reg_written;
7258 progress = true;
7259
7260 if (fromReg == noreg) {
7261 if (from->is_reg()) {
7262 fromReg = from->as_Register();
7263 } else {
7264 int st_off = from->reg2stack() * VMRegImpl::stack_slot_size;
7265 ldr(tmp1, Address(sp, st_off));
7266 fromReg = tmp1;
7267 }
7268 if (null_check) {
7269 // Nullable inline type argument, emit null check
7270 cbz(fromReg, L_null);
7271 }
7272 }
7273 int off = sig->at(stream.sig_index())._offset;
7274 if (off == -1) {
7275 assert(null_check, "Missing null check at");
7276 if (toReg->is_stack()) {
7277 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size;
7278 mov(tmp2, 1);
7279 str(tmp2, Address(sp, st_off));
7280 } else {
7281 mov(toReg->as_Register(), 1);
7282 }
7283 continue;
7284 }
7285 assert(off > 0, "offset in object should be positive");
7286 Address fromAddr = Address(fromReg, off);
7287 if (!toReg->is_FloatRegister()) {
7288 Register dst = toReg->is_stack() ? tmp2 : toReg->as_Register();
7289 if (is_reference_type(bt)) {
7290 load_heap_oop(dst, fromAddr, rscratch1, rscratch2);
7291 } else {
7292 bool is_signed = (bt != T_CHAR) && (bt != T_BOOLEAN);
7293 load_sized_value(dst, fromAddr, type2aelembytes(bt), is_signed);
7294 }
7295 if (toReg->is_stack()) {
7296 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size;
7297 str(dst, Address(sp, st_off));
7298 }
7299 } else if (bt == T_DOUBLE) {
7300 ldrd(toReg->as_FloatRegister(), fromAddr);
7301 } else {
7302 assert(bt == T_FLOAT, "must be float");
7303 ldrs(toReg->as_FloatRegister(), fromAddr);
7304 }
7305 }
7306 if (progress && null_check) {
7307 if (done) {
7308 b(L_notNull);
7309 bind(L_null);
7310 // Set null marker to zero to signal that the argument is null.
7311 // Also set all oop fields to zero to make the GC happy.
7312 stream.reset(sig_index, to_index);
7313 while (stream.next(toReg, bt)) {
7314 if (sig->at(stream.sig_index())._offset == -1 ||
7315 bt == T_OBJECT || bt == T_ARRAY) {
7316 if (toReg->is_stack()) {
7317 int st_off = toReg->reg2stack() * VMRegImpl::stack_slot_size;
7318 str(zr, Address(sp, st_off));
7319 } else {
7320 mov(toReg->as_Register(), zr);
7321 }
7322 }
7323 }
7324 bind(L_notNull);
7325 } else {
7326 bind(L_null);
7327 }
7328 }
7329
7330 sig_index = stream.sig_index();
7331 to_index = stream.regs_index();
7332
7333 if (mark_done && reg_state[from->value()] != reg_written) {
7334 // This is okay because no one else will write to that slot
7335 reg_state[from->value()] = reg_writable;
7336 }
7337 from_index--;
7338 assert(progress || (start_offset == offset()), "should not emit code");
7339 return done;
7340 }
7341
7342 // Pack fields back into an inline type oop
7343 bool MacroAssembler::pack_inline_helper(const GrowableArray<SigEntry>* sig, int& sig_index, int vtarg_index,
7344 VMRegPair* from, int from_count, int& from_index, VMReg to,
7345 RegState reg_state[], Register val_array) {
7346 assert(sig->at(sig_index)._bt == T_METADATA, "should be at delimiter");
7347 assert(to->is_valid(), "destination must be valid");
7348
7349 if (reg_state[to->value()] == reg_written) {
7350 skip_unpacked_fields(sig, sig_index, from, from_count, from_index);
7351 return true; // Already written
7352 }
7353
7354 // The GC barrier expanded by store_heap_oop below may call into the
7355 // runtime so use callee-saved registers for any values that need to be
7356 // preserved. The GC barrier assembler should take care of saving the
7357 // Java argument registers.
7358 // TODO 8284443 Isn't it an issue if below code uses r14 as tmp when it contains a spilled value?
7359 // Be careful with r14 because it's used for spilling (see MacroAssembler::spill_reg_for).
7360 Register val_obj_tmp = r21;
7361 Register from_reg_tmp = r22;
7362 Register tmp1 = r14;
7363 Register tmp2 = r13;
7364 Register tmp3 = r12;
7365 Register val_obj = to->is_stack() ? val_obj_tmp : to->as_Register();
7366
7367 assert_different_registers(val_obj_tmp, from_reg_tmp, tmp1, tmp2, tmp3, val_array);
7368
7369 if (reg_state[to->value()] == reg_readonly) {
7370 if (!is_reg_in_unpacked_fields(sig, sig_index, to, from, from_count, from_index)) {
7371 skip_unpacked_fields(sig, sig_index, from, from_count, from_index);
7372 return false; // Not yet writable
7373 }
7374 val_obj = val_obj_tmp;
7375 }
7376
7377 int index = arrayOopDesc::base_offset_in_bytes(T_OBJECT) + vtarg_index * type2aelembytes(T_OBJECT);
7378 load_heap_oop(val_obj, Address(val_array, index), tmp1, tmp2);
7379
7380 ScalarizedInlineArgsStream stream(sig, sig_index, from, from_count, from_index);
7381 VMReg fromReg;
7382 BasicType bt;
7383 Label L_null;
7384 while (stream.next(fromReg, bt)) {
7385 assert(fromReg->is_valid(), "source must be valid");
7386 reg_state[fromReg->value()] = reg_writable;
7387
7388 int off = sig->at(stream.sig_index())._offset;
7389 if (off == -1) {
7390 // Nullable inline type argument, emit null check
7391 Label L_notNull;
7392 if (fromReg->is_stack()) {
7393 int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size;
7394 ldrb(tmp2, Address(sp, ld_off));
7395 cbnz(tmp2, L_notNull);
7396 } else {
7397 cbnz(fromReg->as_Register(), L_notNull);
7398 }
7399 mov(val_obj, 0);
7400 b(L_null);
7401 bind(L_notNull);
7402 continue;
7403 }
7404
7405 assert(off > 0, "offset in object should be positive");
7406 size_t size_in_bytes = is_java_primitive(bt) ? type2aelembytes(bt) : wordSize;
7407
7408 // Pack the scalarized field into the value object.
7409 Address dst(val_obj, off);
7410
7411 if (!fromReg->is_FloatRegister()) {
7412 Register src;
7413 if (fromReg->is_stack()) {
7414 src = from_reg_tmp;
7415 int ld_off = fromReg->reg2stack() * VMRegImpl::stack_slot_size;
7416 load_sized_value(src, Address(sp, ld_off), size_in_bytes, /* is_signed */ false);
7417 } else {
7418 src = fromReg->as_Register();
7419 }
7420 assert_different_registers(dst.base(), src, tmp1, tmp2, tmp3, val_array);
7421 if (is_reference_type(bt)) {
7422 store_heap_oop(dst, src, tmp1, tmp2, tmp3, IN_HEAP | ACCESS_WRITE | IS_DEST_UNINITIALIZED);
7423 } else {
7424 store_sized_value(dst, src, size_in_bytes);
7425 }
7426 } else if (bt == T_DOUBLE) {
7427 strd(fromReg->as_FloatRegister(), dst);
7428 } else {
7429 assert(bt == T_FLOAT, "must be float");
7430 strs(fromReg->as_FloatRegister(), dst);
7431 }
7432 }
7433 bind(L_null);
7434 sig_index = stream.sig_index();
7435 from_index = stream.regs_index();
7436
7437 assert(reg_state[to->value()] == reg_writable, "must have already been read");
7438 bool success = move_helper(val_obj->as_VMReg(), to, T_OBJECT, reg_state);
7439 assert(success, "to register must be writeable");
7440
7441 return true;
7442 }
7443
7444 VMReg MacroAssembler::spill_reg_for(VMReg reg) {
7445 return (reg->is_FloatRegister()) ? v8->as_VMReg() : r14->as_VMReg();
7446 }
7447
7448 void MacroAssembler::cache_wb(Address line) {
7449 assert(line.getMode() == Address::base_plus_offset, "mode should be base_plus_offset");
7450 assert(line.index() == noreg, "index should be noreg");
7451 assert(line.offset() == 0, "offset should be 0");
7452 // would like to assert this
7453 // assert(line._ext.shift == 0, "shift should be zero");
7454 if (VM_Version::supports_dcpop()) {
7455 // writeback using clear virtual address to point of persistence
7456 dc(Assembler::CVAP, line.base());
7457 } else {
7458 // no need to generate anything as Unsafe.writebackMemory should
7459 // never invoke this stub
7460 }
7461 }
7462
7463 void MacroAssembler::cache_wbsync(bool is_pre) {
7464 // we only need a barrier post sync
7465 if (!is_pre) {
7466 membar(Assembler::AnyAny);
7467 }
7468 }
7469
7470 void MacroAssembler::verify_sve_vector_length(Register tmp) {
7471 if (!UseSVE || VM_Version::get_max_supported_sve_vector_length() == FloatRegister::sve_vl_min) {
7472 return;
7473 }
7474 // Make sure that native code does not change SVE vector length.
7475 Label verify_ok;
7476 movw(tmp, zr);
7477 sve_inc(tmp, B);
7478 subsw(zr, tmp, VM_Version::get_initial_sve_vector_length());
7479 br(EQ, verify_ok);
7480 stop("Error: SVE vector length has changed since jvm startup");
7481 bind(verify_ok);
7482 }
7483
7484 void MacroAssembler::verify_ptrue() {
7485 Label verify_ok;
7486 if (!UseSVE) {
7487 return;
7488 }
7489 sve_cntp(rscratch1, B, ptrue, ptrue); // get true elements count.
7490 sve_dec(rscratch1, B);
7491 cbz(rscratch1, verify_ok);
7492 stop("Error: the preserved predicate register (p7) elements are not all true");
7493 bind(verify_ok);
7494 }
7495
7496 void MacroAssembler::safepoint_isb() {
7497 isb();
7498 #ifndef PRODUCT
7499 if (VerifyCrossModifyFence) {
7500 // Clear the thread state.
7501 strb(zr, Address(rthread, in_bytes(JavaThread::requires_cross_modify_fence_offset())));
7502 }
7503 #endif
7504 }
7505
7506 #ifndef PRODUCT
7507 void MacroAssembler::verify_cross_modify_fence_not_required() {
7508 if (VerifyCrossModifyFence) {
7509 // Check if thread needs a cross modify fence.
7510 ldrb(rscratch1, Address(rthread, in_bytes(JavaThread::requires_cross_modify_fence_offset())));
7511 Label fence_not_required;
7512 cbz(rscratch1, fence_not_required);
7513 // If it does then fail.
7514 lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::verify_cross_modify_fence_failure)));
7515 mov(c_rarg0, rthread);
7516 blr(rscratch1);
7517 bind(fence_not_required);
7518 }
7519 }
7520 #endif
7521
7522 void MacroAssembler::spin_wait() {
7523 for (int i = 0; i < VM_Version::spin_wait_desc().inst_count(); ++i) {
7524 switch (VM_Version::spin_wait_desc().inst()) {
7525 case SpinWait::NOP:
7526 nop();
7527 break;
7528 case SpinWait::ISB:
7529 isb();
7530 break;
7531 case SpinWait::YIELD:
7532 yield();
7533 break;
7534 default:
7535 ShouldNotReachHere();
7536 }
7537 }
7538 }
7539
7540 // Stack frame creation/removal
7541
7542 void MacroAssembler::enter(bool strip_ret_addr) {
7543 if (strip_ret_addr) {
7544 // Addresses can only be signed once. If there are multiple nested frames being created
7545 // in the same function, then the return address needs stripping first.
7546 strip_return_address();
7547 }
7548 protect_return_address();
7549 stp(rfp, lr, Address(pre(sp, -2 * wordSize)));
7550 mov(rfp, sp);
7551 }
7552
7553 void MacroAssembler::leave() {
7554 mov(sp, rfp);
7555 ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
7556 authenticate_return_address();
7557 }
7558
7559 // ROP Protection
7560 // Use the AArch64 PAC feature to add ROP protection for generated code. Use whenever creating/
7561 // destroying stack frames or whenever directly loading/storing the LR to memory.
7562 // If ROP protection is not set then these functions are no-ops.
7563 // For more details on PAC see pauth_aarch64.hpp.
7564
7565 // Sign the LR. Use during construction of a stack frame, before storing the LR to memory.
7566 // Uses value zero as the modifier.
7567 //
7568 void MacroAssembler::protect_return_address() {
7569 if (VM_Version::use_rop_protection()) {
7570 check_return_address();
7571 paciaz();
7572 }
7573 }
7574
7575 // Sign the return value in the given register. Use before updating the LR in the existing stack
7576 // frame for the current function.
7577 // Uses value zero as the modifier.
7578 //
7579 void MacroAssembler::protect_return_address(Register return_reg) {
7580 if (VM_Version::use_rop_protection()) {
7581 check_return_address(return_reg);
7582 paciza(return_reg);
7583 }
7584 }
7585
7586 // Authenticate the LR. Use before function return, after restoring FP and loading LR from memory.
7587 // Uses value zero as the modifier.
7588 //
7589 void MacroAssembler::authenticate_return_address() {
7590 if (VM_Version::use_rop_protection()) {
7591 autiaz();
7592 check_return_address();
7593 }
7594 }
7595
7596 // Authenticate the return value in the given register. Use before updating the LR in the existing
7597 // stack frame for the current function.
7598 // Uses value zero as the modifier.
7599 //
7600 void MacroAssembler::authenticate_return_address(Register return_reg) {
7601 if (VM_Version::use_rop_protection()) {
7602 autiza(return_reg);
7603 check_return_address(return_reg);
7604 }
7605 }
7606
7607 // Strip any PAC data from LR without performing any authentication. Use with caution - only if
7608 // there is no guaranteed way of authenticating the LR.
7609 //
7610 void MacroAssembler::strip_return_address() {
7611 if (VM_Version::use_rop_protection()) {
7612 xpaclri();
7613 }
7614 }
7615
7616 #ifndef PRODUCT
7617 // PAC failures can be difficult to debug. After an authentication failure, a segfault will only
7618 // occur when the pointer is used - ie when the program returns to the invalid LR. At this point
7619 // it is difficult to debug back to the callee function.
7620 // This function simply loads from the address in the given register.
7621 // Use directly after authentication to catch authentication failures.
7622 // Also use before signing to check that the pointer is valid and hasn't already been signed.
7623 //
7624 void MacroAssembler::check_return_address(Register return_reg) {
7625 if (VM_Version::use_rop_protection()) {
7626 ldr(zr, Address(return_reg));
7627 }
7628 }
7629 #endif
7630
7631 // The java_calling_convention describes stack locations as ideal slots on
7632 // a frame with no abi restrictions. Since we must observe abi restrictions
7633 // (like the placement of the register window) the slots must be biased by
7634 // the following value.
7635 static int reg2offset_in(VMReg r) {
7636 // Account for saved rfp and lr
7637 // This should really be in_preserve_stack_slots
7638 return (r->reg2stack() + 4) * VMRegImpl::stack_slot_size;
7639 }
7640
7641 static int reg2offset_out(VMReg r) {
7642 return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
7643 }
7644
7645 // On 64bit we will store integer like items to the stack as
7646 // 64bits items (AArch64 ABI) even though java would only store
7647 // 32bits for a parameter. On 32bit it will simply be 32bits
7648 // So this routine will do 32->32 on 32bit and 32->64 on 64bit
7649 void MacroAssembler::move32_64(VMRegPair src, VMRegPair dst, Register tmp) {
7650 if (src.first()->is_stack()) {
7651 if (dst.first()->is_stack()) {
7652 // stack to stack
7653 ldr(tmp, Address(rfp, reg2offset_in(src.first())));
7654 str(tmp, Address(sp, reg2offset_out(dst.first())));
7655 } else {
7656 // stack to reg
7657 ldrsw(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first())));
7658 }
7659 } else if (dst.first()->is_stack()) {
7660 // reg to stack
7661 str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first())));
7662 } else {
7663 if (dst.first() != src.first()) {
7664 sxtw(dst.first()->as_Register(), src.first()->as_Register());
7665 }
7666 }
7667 }
7668
7669 // An oop arg. Must pass a handle not the oop itself
7670 void MacroAssembler::object_move(
7671 OopMap* map,
7672 int oop_handle_offset,
7673 int framesize_in_slots,
7674 VMRegPair src,
7675 VMRegPair dst,
7676 bool is_receiver,
7677 int* receiver_offset) {
7678
7679 // must pass a handle. First figure out the location we use as a handle
7680
7681 Register rHandle = dst.first()->is_stack() ? rscratch2 : dst.first()->as_Register();
7682
7683 // See if oop is null if it is we need no handle
7684
7685 if (src.first()->is_stack()) {
7686
7687 // Oop is already on the stack as an argument
7688 int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots();
7689 map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots));
7690 if (is_receiver) {
7691 *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size;
7692 }
7693
7694 ldr(rscratch1, Address(rfp, reg2offset_in(src.first())));
7695 lea(rHandle, Address(rfp, reg2offset_in(src.first())));
7696 // conditionally move a null
7697 cmp(rscratch1, zr);
7698 csel(rHandle, zr, rHandle, Assembler::EQ);
7699 } else {
7700
7701 // Oop is in an a register we must store it to the space we reserve
7702 // on the stack for oop_handles and pass a handle if oop is non-null
7703
7704 const Register rOop = src.first()->as_Register();
7705 int oop_slot;
7706 if (rOop == j_rarg0)
7707 oop_slot = 0;
7708 else if (rOop == j_rarg1)
7709 oop_slot = 1;
7710 else if (rOop == j_rarg2)
7711 oop_slot = 2;
7712 else if (rOop == j_rarg3)
7713 oop_slot = 3;
7714 else if (rOop == j_rarg4)
7715 oop_slot = 4;
7716 else if (rOop == j_rarg5)
7717 oop_slot = 5;
7718 else if (rOop == j_rarg6)
7719 oop_slot = 6;
7720 else {
7721 assert(rOop == j_rarg7, "wrong register");
7722 oop_slot = 7;
7723 }
7724
7725 oop_slot = oop_slot * VMRegImpl::slots_per_word + oop_handle_offset;
7726 int offset = oop_slot*VMRegImpl::stack_slot_size;
7727
7728 map->set_oop(VMRegImpl::stack2reg(oop_slot));
7729 // Store oop in handle area, may be null
7730 str(rOop, Address(sp, offset));
7731 if (is_receiver) {
7732 *receiver_offset = offset;
7733 }
7734
7735 cmp(rOop, zr);
7736 lea(rHandle, Address(sp, offset));
7737 // conditionally move a null
7738 csel(rHandle, zr, rHandle, Assembler::EQ);
7739 }
7740
7741 // If arg is on the stack then place it otherwise it is already in correct reg.
7742 if (dst.first()->is_stack()) {
7743 str(rHandle, Address(sp, reg2offset_out(dst.first())));
7744 }
7745 }
7746
7747 // A float arg may have to do float reg int reg conversion
7748 void MacroAssembler::float_move(VMRegPair src, VMRegPair dst, Register tmp) {
7749 if (src.first()->is_stack()) {
7750 if (dst.first()->is_stack()) {
7751 ldrw(tmp, Address(rfp, reg2offset_in(src.first())));
7752 strw(tmp, Address(sp, reg2offset_out(dst.first())));
7753 } else {
7754 ldrs(dst.first()->as_FloatRegister(), Address(rfp, reg2offset_in(src.first())));
7755 }
7756 } else if (src.first() != dst.first()) {
7757 if (src.is_single_phys_reg() && dst.is_single_phys_reg())
7758 fmovs(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister());
7759 else
7760 strs(src.first()->as_FloatRegister(), Address(sp, reg2offset_out(dst.first())));
7761 }
7762 }
7763
7764 // A long move
7765 void MacroAssembler::long_move(VMRegPair src, VMRegPair dst, Register tmp) {
7766 if (src.first()->is_stack()) {
7767 if (dst.first()->is_stack()) {
7768 // stack to stack
7769 ldr(tmp, Address(rfp, reg2offset_in(src.first())));
7770 str(tmp, Address(sp, reg2offset_out(dst.first())));
7771 } else {
7772 // stack to reg
7773 ldr(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first())));
7774 }
7775 } else if (dst.first()->is_stack()) {
7776 // reg to stack
7777 // Do we really have to sign extend???
7778 // __ movslq(src.first()->as_Register(), src.first()->as_Register());
7779 str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first())));
7780 } else {
7781 if (dst.first() != src.first()) {
7782 mov(dst.first()->as_Register(), src.first()->as_Register());
7783 }
7784 }
7785 }
7786
7787
7788 // A double move
7789 void MacroAssembler::double_move(VMRegPair src, VMRegPair dst, Register tmp) {
7790 if (src.first()->is_stack()) {
7791 if (dst.first()->is_stack()) {
7792 ldr(tmp, Address(rfp, reg2offset_in(src.first())));
7793 str(tmp, Address(sp, reg2offset_out(dst.first())));
7794 } else {
7795 ldrd(dst.first()->as_FloatRegister(), Address(rfp, reg2offset_in(src.first())));
7796 }
7797 } else if (src.first() != dst.first()) {
7798 if (src.is_single_phys_reg() && dst.is_single_phys_reg())
7799 fmovd(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister());
7800 else
7801 strd(src.first()->as_FloatRegister(), Address(sp, reg2offset_out(dst.first())));
7802 }
7803 }
7804
7805 // Implements lightweight-locking.
7806 //
7807 // - obj: the object to be locked
7808 // - t1, t2, t3: temporary registers, will be destroyed
7809 // - slow: branched to if locking fails, absolute offset may larger than 32KB (imm14 encoding).
7810 void MacroAssembler::lightweight_lock(Register basic_lock, Register obj, Register t1, Register t2, Register t3, Label& slow) {
7811 assert(LockingMode == LM_LIGHTWEIGHT, "only used with new lightweight locking");
7812 assert_different_registers(basic_lock, obj, t1, t2, t3, rscratch1);
7813
7814 Label push;
7815 const Register top = t1;
7816 const Register mark = t2;
7817 const Register t = t3;
7818
7819 // Preload the markWord. It is important that this is the first
7820 // instruction emitted as it is part of C1's null check semantics.
7821 ldr(mark, Address(obj, oopDesc::mark_offset_in_bytes()));
7822
7823 if (UseObjectMonitorTable) {
7824 // Clear cache in case fast locking succeeds or we need to take the slow-path.
7825 str(zr, Address(basic_lock, BasicObjectLock::lock_offset() + in_ByteSize((BasicLock::object_monitor_cache_offset_in_bytes()))));
7826 }
7827
7828 if (DiagnoseSyncOnValueBasedClasses != 0) {
7829 load_klass(t1, obj);
7830 ldrb(t1, Address(t1, Klass::misc_flags_offset()));
7831 tst(t1, KlassFlags::_misc_is_value_based_class);
7832 br(Assembler::NE, slow);
7833 }
7834
7835 // Check if the lock-stack is full.
7836 ldrw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7837 cmpw(top, (unsigned)LockStack::end_offset());
7838 br(Assembler::GE, slow);
7839
7840 // Check for recursion.
7841 subw(t, top, oopSize);
7842 ldr(t, Address(rthread, t));
7843 cmp(obj, t);
7844 br(Assembler::EQ, push);
7845
7846 // Check header for monitor (0b10).
7847 tst(mark, markWord::monitor_value);
7848 br(Assembler::NE, slow);
7849
7850 // Try to lock. Transition lock bits 0b01 => 0b00
7851 assert(oopDesc::mark_offset_in_bytes() == 0, "required to avoid lea");
7852 orr(mark, mark, markWord::unlocked_value);
7853 if (EnableValhalla) {
7854 // Mask inline_type bit such that we go to the slow path if object is an inline type
7855 andr(mark, mark, ~((int) markWord::inline_type_bit_in_place));
7856 }
7857 eor(t, mark, markWord::unlocked_value);
7858 cmpxchg(/*addr*/ obj, /*expected*/ mark, /*new*/ t, Assembler::xword,
7859 /*acquire*/ true, /*release*/ false, /*weak*/ false, noreg);
7860 br(Assembler::NE, slow);
7861
7862 bind(push);
7863 // After successful lock, push object on lock-stack.
7864 str(obj, Address(rthread, top));
7865 addw(top, top, oopSize);
7866 strw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7867 }
7868
7869 // Implements lightweight-unlocking.
7870 //
7871 // - obj: the object to be unlocked
7872 // - t1, t2, t3: temporary registers
7873 // - slow: branched to if unlocking fails, absolute offset may larger than 32KB (imm14 encoding).
7874 void MacroAssembler::lightweight_unlock(Register obj, Register t1, Register t2, Register t3, Label& slow) {
7875 assert(LockingMode == LM_LIGHTWEIGHT, "only used with new lightweight locking");
7876 // cmpxchg clobbers rscratch1.
7877 assert_different_registers(obj, t1, t2, t3, rscratch1);
7878
7879 #ifdef ASSERT
7880 {
7881 // Check for lock-stack underflow.
7882 Label stack_ok;
7883 ldrw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
7884 cmpw(t1, (unsigned)LockStack::start_offset());
7885 br(Assembler::GE, stack_ok);
7886 STOP("Lock-stack underflow");
7887 bind(stack_ok);
7888 }
7889 #endif
7890
7891 Label unlocked, push_and_slow;
7892 const Register top = t1;
7893 const Register mark = t2;
7894 const Register t = t3;
7895
7896 // Check if obj is top of lock-stack.
7897 ldrw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7898 subw(top, top, oopSize);
7899 ldr(t, Address(rthread, top));
7900 cmp(obj, t);
7901 br(Assembler::NE, slow);
7902
7903 // Pop lock-stack.
7904 DEBUG_ONLY(str(zr, Address(rthread, top));)
7905 strw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7906
7907 // Check if recursive.
7908 subw(t, top, oopSize);
7909 ldr(t, Address(rthread, t));
7910 cmp(obj, t);
7911 br(Assembler::EQ, unlocked);
7912
7913 // Not recursive. Check header for monitor (0b10).
7914 ldr(mark, Address(obj, oopDesc::mark_offset_in_bytes()));
7915 tbnz(mark, log2i_exact(markWord::monitor_value), push_and_slow);
7916
7917 #ifdef ASSERT
7918 // Check header not unlocked (0b01).
7919 Label not_unlocked;
7920 tbz(mark, log2i_exact(markWord::unlocked_value), not_unlocked);
7921 stop("lightweight_unlock already unlocked");
7922 bind(not_unlocked);
7923 #endif
7924
7925 // Try to unlock. Transition lock bits 0b00 => 0b01
7926 assert(oopDesc::mark_offset_in_bytes() == 0, "required to avoid lea");
7927 orr(t, mark, markWord::unlocked_value);
7928 cmpxchg(obj, mark, t, Assembler::xword,
7929 /*acquire*/ false, /*release*/ true, /*weak*/ false, noreg);
7930 br(Assembler::EQ, unlocked);
7931
7932 bind(push_and_slow);
7933 // Restore lock-stack and handle the unlock in runtime.
7934 DEBUG_ONLY(str(obj, Address(rthread, top));)
7935 addw(top, top, oopSize);
7936 strw(top, Address(rthread, JavaThread::lock_stack_top_offset()));
7937 b(slow);
7938
7939 bind(unlocked);
7940 }