1 /*
2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2021, 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 <sys/types.h>
27
28 #include "precompiled.hpp"
29 #include "asm/assembler.hpp"
30 #include "asm/assembler.inline.hpp"
31 #include "ci/ciEnv.hpp"
32 #include "compiler/compileTask.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/shared/barrierSet.hpp"
36 #include "gc/shared/barrierSetAssembler.hpp"
37 #include "gc/shared/cardTableBarrierSet.hpp"
38 #include "gc/shared/cardTable.hpp"
39 #include "gc/shared/collectedHeap.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "interpreter/bytecodeHistogram.hpp"
42 #include "interpreter/interpreter.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/compressedOops.inline.hpp"
49 #include "oops/klass.inline.hpp"
50 #include "runtime/continuation.hpp"
51 #include "runtime/icache.hpp"
52 #include "runtime/interfaceSupport.inline.hpp"
53 #include "runtime/javaThread.hpp"
54 #include "runtime/jniHandles.inline.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #ifdef COMPILER1
59 #include "c1/c1_LIRAssembler.hpp"
60 #endif
61 #ifdef COMPILER2
62 #include "oops/oop.hpp"
63 #include "opto/compile.hpp"
64 #include "opto/node.hpp"
65 #include "opto/output.hpp"
66 #endif
67
68 #ifdef PRODUCT
69 #define BLOCK_COMMENT(str) /* nothing */
70 #else
71 #define BLOCK_COMMENT(str) block_comment(str)
72 #endif
73 #define STOP(str) stop(str);
74 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
75
76 #ifdef ASSERT
77 extern "C" void disnm(intptr_t p);
78 #endif
79 // Target-dependent relocation processing
80 //
81 // Instruction sequences whose target may need to be retrieved or
82 // patched are distinguished by their leading instruction, sorting
83 // them into three main instruction groups and related subgroups.
84 //
85 // 1) Branch, Exception and System (insn count = 1)
86 // 1a) Unconditional branch (immediate):
87 // b/bl imm19
88 // 1b) Compare & branch (immediate):
89 // cbz/cbnz Rt imm19
90 // 1c) Test & branch (immediate):
91 // tbz/tbnz Rt imm14
92 // 1d) Conditional branch (immediate):
93 // b.cond imm19
94 //
95 // 2) Loads and Stores (insn count = 1)
96 // 2a) Load register literal:
97 // ldr Rt imm19
98 //
99 // 3) Data Processing Immediate (insn count = 2 or 3)
100 // 3a) PC-rel. addressing
101 // adr/adrp Rx imm21; ldr/str Ry Rx #imm12
102 // adr/adrp Rx imm21; add Ry Rx #imm12
103 // adr/adrp Rx imm21; movk Rx #imm16<<32; ldr/str Ry, [Rx, #offset_in_page]
104 // adr/adrp Rx imm21
105 // adr/adrp Rx imm21; movk Rx #imm16<<32
106 // adr/adrp Rx imm21; movk Rx #imm16<<32; add Ry, Rx, #offset_in_page
107 // The latter form can only happen when the target is an
108 // ExternalAddress, and (by definition) ExternalAddresses don't
109 // move. Because of that property, there is never any need to
110 // patch the last of the three instructions. However,
111 // MacroAssembler::target_addr_for_insn takes all three
112 // instructions into account and returns the correct address.
113 // 3b) Move wide (immediate)
114 // movz Rx #imm16; movk Rx #imm16 << 16; movk Rx #imm16 << 32;
115 //
116 // A switch on a subset of the instruction's bits provides an
117 // efficient dispatch to these subcases.
118 //
119 // insn[28:26] -> main group ('x' == don't care)
120 // 00x -> UNALLOCATED
121 // 100 -> Data Processing Immediate
122 // 101 -> Branch, Exception and System
123 // x1x -> Loads and Stores
124 //
125 // insn[30:25] -> subgroup ('_' == group, 'x' == don't care).
126 // n.b. in some cases extra bits need to be checked to verify the
127 // instruction is as expected
128 //
129 // 1) ... xx101x Branch, Exception and System
130 // 1a) 00___x Unconditional branch (immediate)
131 // 1b) 01___0 Compare & branch (immediate)
132 // 1c) 01___1 Test & branch (immediate)
133 // 1d) 10___0 Conditional branch (immediate)
134 // other Should not happen
135 //
136 // 2) ... xxx1x0 Loads and Stores
137 // 2a) xx1__00 Load/Store register (insn[28] == 1 && insn[24] == 0)
138 // 2aa) x01__00 Load register literal (i.e. requires insn[29] == 0)
139 // strictly should be 64 bit non-FP/SIMD i.e.
140 // 0101_000 (i.e. requires insn[31:24] == 01011000)
141 //
142 // 3) ... xx100x Data Processing Immediate
143 // 3a) xx___00 PC-rel. addressing (n.b. requires insn[24] == 0)
144 // 3b) xx___101 Move wide (immediate) (n.b. requires insn[24:23] == 01)
145 // strictly should be 64 bit movz #imm16<<0
146 // 110___10100 (i.e. requires insn[31:21] == 11010010100)
147 //
148 class RelocActions {
149 protected:
150 typedef int (*reloc_insn)(address insn_addr, address &target);
151
152 virtual reloc_insn adrpMem() = 0;
153 virtual reloc_insn adrpAdd() = 0;
154 virtual reloc_insn adrpMovk() = 0;
155
156 const address _insn_addr;
157 const uint32_t _insn;
158
159 static uint32_t insn_at(address insn_addr, int n) {
160 return ((uint32_t*)insn_addr)[n];
161 }
162 uint32_t insn_at(int n) const {
163 return insn_at(_insn_addr, n);
164 }
165
166 public:
167
168 RelocActions(address insn_addr) : _insn_addr(insn_addr), _insn(insn_at(insn_addr, 0)) {}
169 RelocActions(address insn_addr, uint32_t insn)
170 : _insn_addr(insn_addr), _insn(insn) {}
171
172 virtual int unconditionalBranch(address insn_addr, address &target) = 0;
173 virtual int conditionalBranch(address insn_addr, address &target) = 0;
174 virtual int testAndBranch(address insn_addr, address &target) = 0;
175 virtual int loadStore(address insn_addr, address &target) = 0;
176 virtual int adr(address insn_addr, address &target) = 0;
177 virtual int adrp(address insn_addr, address &target, reloc_insn inner) = 0;
178 virtual int immediate(address insn_addr, address &target) = 0;
179 virtual void verify(address insn_addr, address &target) = 0;
180
181 int ALWAYSINLINE run(address insn_addr, address &target) {
182 int instructions = 1;
183
184 uint32_t dispatch = Instruction_aarch64::extract(_insn, 30, 25);
185 switch(dispatch) {
186 case 0b001010:
187 case 0b001011: {
188 instructions = unconditionalBranch(insn_addr, target);
189 break;
190 }
191 case 0b101010: // Conditional branch (immediate)
192 case 0b011010: { // Compare & branch (immediate)
193 instructions = conditionalBranch(insn_addr, target);
194 break;
195 }
196 case 0b011011: {
197 instructions = testAndBranch(insn_addr, target);
198 break;
199 }
200 case 0b001100:
201 case 0b001110:
202 case 0b011100:
203 case 0b011110:
204 case 0b101100:
205 case 0b101110:
206 case 0b111100:
207 case 0b111110: {
208 // load/store
209 if ((Instruction_aarch64::extract(_insn, 29, 24) & 0b111011) == 0b011000) {
210 // Load register (literal)
211 instructions = loadStore(insn_addr, target);
212 break;
213 } else {
214 // nothing to do
215 assert(target == 0, "did not expect to relocate target for polling page load");
216 }
217 break;
218 }
219 case 0b001000:
220 case 0b011000:
221 case 0b101000:
222 case 0b111000: {
223 // adr/adrp
224 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
225 int shift = Instruction_aarch64::extract(_insn, 31, 31);
226 if (shift) {
227 uint32_t insn2 = insn_at(1);
228 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 &&
229 Instruction_aarch64::extract(_insn, 4, 0) ==
230 Instruction_aarch64::extract(insn2, 9, 5)) {
231 instructions = adrp(insn_addr, target, adrpMem());
232 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 &&
233 Instruction_aarch64::extract(_insn, 4, 0) ==
234 Instruction_aarch64::extract(insn2, 4, 0)) {
235 instructions = adrp(insn_addr, target, adrpAdd());
236 } else if (Instruction_aarch64::extract(insn2, 31, 21) == 0b11110010110 &&
237 Instruction_aarch64::extract(_insn, 4, 0) ==
238 Instruction_aarch64::extract(insn2, 4, 0)) {
239 instructions = adrp(insn_addr, target, adrpMovk());
240 } else {
241 ShouldNotReachHere();
242 }
243 } else {
244 instructions = adr(insn_addr, target);
245 }
246 break;
247 }
248 case 0b001001:
249 case 0b011001:
250 case 0b101001:
251 case 0b111001: {
252 instructions = immediate(insn_addr, target);
253 break;
254 }
255 default: {
256 ShouldNotReachHere();
257 }
258 }
259
260 verify(insn_addr, target);
261 return instructions * NativeInstruction::instruction_size;
262 }
263 };
264
265 class Patcher : public RelocActions {
266 virtual reloc_insn adrpMem() { return &Patcher::adrpMem_impl; }
267 virtual reloc_insn adrpAdd() { return &Patcher::adrpAdd_impl; }
268 virtual reloc_insn adrpMovk() { return &Patcher::adrpMovk_impl; }
269
270 public:
271 Patcher(address insn_addr) : RelocActions(insn_addr) {}
272
273 virtual int unconditionalBranch(address insn_addr, address &target) {
274 intptr_t offset = (target - insn_addr) >> 2;
275 Instruction_aarch64::spatch(insn_addr, 25, 0, offset);
276 return 1;
277 }
278 virtual int conditionalBranch(address insn_addr, address &target) {
279 intptr_t offset = (target - insn_addr) >> 2;
280 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
281 return 1;
282 }
283 virtual int testAndBranch(address insn_addr, address &target) {
284 intptr_t offset = (target - insn_addr) >> 2;
285 Instruction_aarch64::spatch(insn_addr, 18, 5, offset);
286 return 1;
287 }
288 virtual int loadStore(address insn_addr, address &target) {
289 intptr_t offset = (target - insn_addr) >> 2;
290 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
291 return 1;
292 }
293 virtual int adr(address insn_addr, address &target) {
294 #ifdef ASSERT
295 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
296 #endif
297 // PC-rel. addressing
298 ptrdiff_t offset = target - insn_addr;
299 int offset_lo = offset & 3;
300 offset >>= 2;
301 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
302 Instruction_aarch64::patch(insn_addr, 30, 29, offset_lo);
303 return 1;
304 }
305 virtual int adrp(address insn_addr, address &target, reloc_insn inner) {
306 int instructions = 1;
307 #ifdef ASSERT
308 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
309 #endif
310 ptrdiff_t offset = target - insn_addr;
311 instructions = 2;
312 precond(inner != nullptr);
313 // Give the inner reloc a chance to modify the target.
314 address adjusted_target = target;
315 instructions = (*inner)(insn_addr, adjusted_target);
316 uintptr_t pc_page = (uintptr_t)insn_addr >> 12;
317 uintptr_t adr_page = (uintptr_t)adjusted_target >> 12;
318 offset = adr_page - pc_page;
319 int offset_lo = offset & 3;
320 offset >>= 2;
321 Instruction_aarch64::spatch(insn_addr, 23, 5, offset);
322 Instruction_aarch64::patch(insn_addr, 30, 29, offset_lo);
323 return instructions;
324 }
325 static int adrpMem_impl(address insn_addr, address &target) {
326 uintptr_t dest = (uintptr_t)target;
327 int offset_lo = dest & 0xfff;
328 uint32_t insn2 = insn_at(insn_addr, 1);
329 uint32_t size = Instruction_aarch64::extract(insn2, 31, 30);
330 Instruction_aarch64::patch(insn_addr + sizeof (uint32_t), 21, 10, offset_lo >> size);
331 guarantee(((dest >> size) << size) == dest, "misaligned target");
332 return 2;
333 }
334 static int adrpAdd_impl(address insn_addr, address &target) {
335 uintptr_t dest = (uintptr_t)target;
336 int offset_lo = dest & 0xfff;
337 Instruction_aarch64::patch(insn_addr + sizeof (uint32_t), 21, 10, offset_lo);
338 return 2;
339 }
340 static int adrpMovk_impl(address insn_addr, address &target) {
341 uintptr_t dest = uintptr_t(target);
342 Instruction_aarch64::patch(insn_addr + sizeof (uint32_t), 20, 5, (uintptr_t)target >> 32);
343 dest = (dest & 0xffffffffULL) | (uintptr_t(insn_addr) & 0xffff00000000ULL);
344 target = address(dest);
345 return 2;
346 }
347 virtual int immediate(address insn_addr, address &target) {
348 assert(Instruction_aarch64::extract(_insn, 31, 21) == 0b11010010100, "must be");
349 uint64_t dest = (uint64_t)target;
350 // Move wide constant
351 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
352 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch");
353 Instruction_aarch64::patch(insn_addr, 20, 5, dest & 0xffff);
354 Instruction_aarch64::patch(insn_addr+4, 20, 5, (dest >>= 16) & 0xffff);
355 Instruction_aarch64::patch(insn_addr+8, 20, 5, (dest >>= 16) & 0xffff);
356 return 3;
357 }
358 virtual void verify(address insn_addr, address &target) {
359 #ifdef ASSERT
360 address address_is = MacroAssembler::target_addr_for_insn(insn_addr);
361 if (!(address_is == target)) {
362 tty->print_cr("%p at %p should be %p", address_is, insn_addr, target);
363 disnm((intptr_t)insn_addr);
364 assert(address_is == target, "should be");
365 }
366 #endif
367 }
368 };
369
370 // If insn1 and insn2 use the same register to form an address, either
371 // by an offsetted LDR or a simple ADD, return the offset. If the
372 // second instruction is an LDR, the offset may be scaled.
373 static bool offset_for(uint32_t insn1, uint32_t insn2, ptrdiff_t &byte_offset) {
374 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 &&
375 Instruction_aarch64::extract(insn1, 4, 0) ==
376 Instruction_aarch64::extract(insn2, 9, 5)) {
377 // Load/store register (unsigned immediate)
378 byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
379 uint32_t size = Instruction_aarch64::extract(insn2, 31, 30);
380 byte_offset <<= size;
381 return true;
382 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 &&
383 Instruction_aarch64::extract(insn1, 4, 0) ==
384 Instruction_aarch64::extract(insn2, 4, 0)) {
385 // add (immediate)
386 byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
387 return true;
388 }
389 return false;
390 }
391
392 class Decoder : public RelocActions {
393 virtual reloc_insn adrpMem() { return &Decoder::adrpMem_impl; }
394 virtual reloc_insn adrpAdd() { return &Decoder::adrpAdd_impl; }
395 virtual reloc_insn adrpMovk() { return &Decoder::adrpMovk_impl; }
396
397 public:
398 Decoder(address insn_addr, uint32_t insn) : RelocActions(insn_addr, insn) {}
399
400 virtual int loadStore(address insn_addr, address &target) {
401 intptr_t offset = Instruction_aarch64::sextract(_insn, 23, 5);
402 target = insn_addr + (offset << 2);
403 return 1;
404 }
405 virtual int unconditionalBranch(address insn_addr, address &target) {
406 intptr_t offset = Instruction_aarch64::sextract(_insn, 25, 0);
407 target = insn_addr + (offset << 2);
408 return 1;
409 }
410 virtual int conditionalBranch(address insn_addr, address &target) {
411 intptr_t offset = Instruction_aarch64::sextract(_insn, 23, 5);
412 target = address(((uint64_t)insn_addr + (offset << 2)));
413 return 1;
414 }
415 virtual int testAndBranch(address insn_addr, address &target) {
416 intptr_t offset = Instruction_aarch64::sextract(_insn, 18, 5);
417 target = address(((uint64_t)insn_addr + (offset << 2)));
418 return 1;
419 }
420 virtual int adr(address insn_addr, address &target) {
421 // PC-rel. addressing
422 intptr_t offset = Instruction_aarch64::extract(_insn, 30, 29);
423 offset |= Instruction_aarch64::sextract(_insn, 23, 5) << 2;
424 target = address((uint64_t)insn_addr + offset);
425 return 1;
426 }
427 virtual int adrp(address insn_addr, address &target, reloc_insn inner) {
428 assert(Instruction_aarch64::extract(_insn, 28, 24) == 0b10000, "must be");
429 intptr_t offset = Instruction_aarch64::extract(_insn, 30, 29);
430 offset |= Instruction_aarch64::sextract(_insn, 23, 5) << 2;
431 int shift = 12;
432 offset <<= shift;
433 uint64_t target_page = ((uint64_t)insn_addr) + offset;
434 target_page &= ((uint64_t)-1) << shift;
435 uint32_t insn2 = insn_at(1);
436 target = address(target_page);
437 precond(inner != nullptr);
438 (*inner)(insn_addr, target);
439 return 2;
440 }
441 static int adrpMem_impl(address insn_addr, address &target) {
442 uint32_t insn2 = insn_at(insn_addr, 1);
443 // Load/store register (unsigned immediate)
444 ptrdiff_t byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
445 uint32_t size = Instruction_aarch64::extract(insn2, 31, 30);
446 byte_offset <<= size;
447 target += byte_offset;
448 return 2;
449 }
450 static int adrpAdd_impl(address insn_addr, address &target) {
451 uint32_t insn2 = insn_at(insn_addr, 1);
452 // add (immediate)
453 ptrdiff_t byte_offset = Instruction_aarch64::extract(insn2, 21, 10);
454 target += byte_offset;
455 return 2;
456 }
457 static int adrpMovk_impl(address insn_addr, address &target) {
458 uint32_t insn2 = insn_at(insn_addr, 1);
459 uint64_t dest = uint64_t(target);
460 dest = (dest & 0xffff0000ffffffff) |
461 ((uint64_t)Instruction_aarch64::extract(insn2, 20, 5) << 32);
462 target = address(dest);
463
464 // We know the destination 4k page. Maybe we have a third
465 // instruction.
466 uint32_t insn = insn_at(insn_addr, 0);
467 uint32_t insn3 = insn_at(insn_addr, 2);
468 ptrdiff_t byte_offset;
469 if (offset_for(insn, insn3, byte_offset)) {
470 target += byte_offset;
471 return 3;
472 } else {
473 return 2;
474 }
475 }
476 virtual int immediate(address insn_addr, address &target) {
477 uint32_t *insns = (uint32_t *)insn_addr;
478 assert(Instruction_aarch64::extract(_insn, 31, 21) == 0b11010010100, "must be");
479 // Move wide constant: movz, movk, movk. See movptr().
480 assert(nativeInstruction_at(insns+1)->is_movk(), "wrong insns in patch");
481 assert(nativeInstruction_at(insns+2)->is_movk(), "wrong insns in patch");
482 target = address(uint64_t(Instruction_aarch64::extract(_insn, 20, 5))
483 + (uint64_t(Instruction_aarch64::extract(insns[1], 20, 5)) << 16)
484 + (uint64_t(Instruction_aarch64::extract(insns[2], 20, 5)) << 32));
485 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
486 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch");
487 return 3;
488 }
489 virtual void verify(address insn_addr, address &target) {
490 }
491 };
492
493 address MacroAssembler::target_addr_for_insn(address insn_addr, uint32_t insn) {
494 Decoder decoder(insn_addr, insn);
495 address target;
496 decoder.run(insn_addr, target);
497 return target;
498 }
499
500 // Patch any kind of instruction; there may be several instructions.
501 // Return the total length (in bytes) of the instructions.
502 int MacroAssembler::pd_patch_instruction_size(address insn_addr, address target) {
503 Patcher patcher(insn_addr);
504 return patcher.run(insn_addr, target);
505 }
506
507 int MacroAssembler::patch_oop(address insn_addr, address o) {
508 int instructions;
509 unsigned insn = *(unsigned*)insn_addr;
510 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
511
512 // OOPs are either narrow (32 bits) or wide (48 bits). We encode
513 // narrow OOPs by setting the upper 16 bits in the first
514 // instruction.
515 if (Instruction_aarch64::extract(insn, 31, 21) == 0b11010010101) {
516 // Move narrow OOP
517 uint32_t n = CompressedOops::narrow_oop_value(cast_to_oop(o));
518 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16);
519 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff);
520 instructions = 2;
521 } else {
522 // Move wide OOP
523 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch");
524 uintptr_t dest = (uintptr_t)o;
525 Instruction_aarch64::patch(insn_addr, 20, 5, dest & 0xffff);
526 Instruction_aarch64::patch(insn_addr+4, 20, 5, (dest >>= 16) & 0xffff);
527 Instruction_aarch64::patch(insn_addr+8, 20, 5, (dest >>= 16) & 0xffff);
528 instructions = 3;
529 }
530 return instructions * NativeInstruction::instruction_size;
531 }
532
533 int MacroAssembler::patch_narrow_klass(address insn_addr, narrowKlass n) {
534 // Metadata pointers are either narrow (32 bits) or wide (48 bits).
535 // We encode narrow ones by setting the upper 16 bits in the first
536 // instruction.
537 NativeInstruction *insn = nativeInstruction_at(insn_addr);
538 assert(Instruction_aarch64::extract(insn->encoding(), 31, 21) == 0b11010010101 &&
539 nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch");
540
541 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16);
542 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff);
543 return 2 * NativeInstruction::instruction_size;
544 }
545
546 address MacroAssembler::target_addr_for_insn_or_null(address insn_addr, unsigned insn) {
547 if (NativeInstruction::is_ldrw_to_zr(address(&insn))) {
548 return nullptr;
549 }
550 return MacroAssembler::target_addr_for_insn(insn_addr, insn);
551 }
552
553 void MacroAssembler::safepoint_poll(Label& slow_path, bool at_return, bool acquire, bool in_nmethod, Register tmp) {
554 if (acquire) {
555 lea(tmp, Address(rthread, JavaThread::polling_word_offset()));
556 ldar(tmp, tmp);
557 } else {
558 ldr(tmp, Address(rthread, JavaThread::polling_word_offset()));
559 }
560 if (at_return) {
561 // Note that when in_nmethod is set, the stack pointer is incremented before the poll. Therefore,
562 // we may safely use the sp instead to perform the stack watermark check.
563 cmp(in_nmethod ? sp : rfp, tmp);
564 br(Assembler::HI, slow_path);
565 } else {
566 tbnz(tmp, log2i_exact(SafepointMechanism::poll_bit()), slow_path);
567 }
568 }
569
570 void MacroAssembler::rt_call(address dest, Register tmp) {
571 CodeBlob *cb = CodeCache::find_blob(dest);
572 if (cb) {
573 far_call(RuntimeAddress(dest));
574 } else {
575 lea(tmp, RuntimeAddress(dest));
576 blr(tmp);
577 }
578 }
579
580 void MacroAssembler::push_cont_fastpath(Register java_thread) {
581 if (!Continuations::enabled()) return;
582 Label done;
583 ldr(rscratch1, Address(java_thread, JavaThread::cont_fastpath_offset()));
584 cmp(sp, rscratch1);
585 br(Assembler::LS, done);
586 mov(rscratch1, sp); // we can't use sp as the source in str
587 str(rscratch1, Address(java_thread, JavaThread::cont_fastpath_offset()));
588 bind(done);
589 }
590
591 void MacroAssembler::pop_cont_fastpath(Register java_thread) {
592 if (!Continuations::enabled()) return;
593 Label done;
594 ldr(rscratch1, Address(java_thread, JavaThread::cont_fastpath_offset()));
595 cmp(sp, rscratch1);
596 br(Assembler::LO, done);
597 str(zr, Address(java_thread, JavaThread::cont_fastpath_offset()));
598 bind(done);
599 }
600
601 void MacroAssembler::reset_last_Java_frame(bool clear_fp) {
602 // we must set sp to zero to clear frame
603 str(zr, Address(rthread, JavaThread::last_Java_sp_offset()));
604
605 // must clear fp, so that compiled frames are not confused; it is
606 // possible that we need it only for debugging
607 if (clear_fp) {
608 str(zr, Address(rthread, JavaThread::last_Java_fp_offset()));
609 }
610
611 // Always clear the pc because it could have been set by make_walkable()
612 str(zr, Address(rthread, JavaThread::last_Java_pc_offset()));
613 }
614
615 // Calls to C land
616 //
617 // When entering C land, the rfp, & resp of the last Java frame have to be recorded
618 // in the (thread-local) JavaThread object. When leaving C land, the last Java fp
619 // has to be reset to 0. This is required to allow proper stack traversal.
620 void MacroAssembler::set_last_Java_frame(Register last_java_sp,
621 Register last_java_fp,
622 Register last_java_pc,
623 Register scratch) {
624
625 if (last_java_pc->is_valid()) {
626 str(last_java_pc, Address(rthread,
627 JavaThread::frame_anchor_offset()
628 + JavaFrameAnchor::last_Java_pc_offset()));
629 }
630
631 // determine last_java_sp register
632 if (last_java_sp == sp) {
633 mov(scratch, sp);
634 last_java_sp = scratch;
635 } else if (!last_java_sp->is_valid()) {
636 last_java_sp = esp;
637 }
638
639 str(last_java_sp, Address(rthread, JavaThread::last_Java_sp_offset()));
640
641 // last_java_fp is optional
642 if (last_java_fp->is_valid()) {
643 str(last_java_fp, Address(rthread, JavaThread::last_Java_fp_offset()));
644 }
645 }
646
647 void MacroAssembler::set_last_Java_frame(Register last_java_sp,
648 Register last_java_fp,
649 address last_java_pc,
650 Register scratch) {
651 assert(last_java_pc != nullptr, "must provide a valid PC");
652
653 adr(scratch, last_java_pc);
654 str(scratch, Address(rthread,
655 JavaThread::frame_anchor_offset()
656 + JavaFrameAnchor::last_Java_pc_offset()));
657
658 set_last_Java_frame(last_java_sp, last_java_fp, noreg, scratch);
659 }
660
661 void MacroAssembler::set_last_Java_frame(Register last_java_sp,
662 Register last_java_fp,
663 Label &L,
664 Register scratch) {
665 if (L.is_bound()) {
666 set_last_Java_frame(last_java_sp, last_java_fp, target(L), scratch);
667 } else {
668 InstructionMark im(this);
669 L.add_patch_at(code(), locator());
670 set_last_Java_frame(last_java_sp, last_java_fp, pc() /* Patched later */, scratch);
671 }
672 }
673
674 static inline bool target_needs_far_branch(address addr) {
675 // codecache size <= 128M
676 if (!MacroAssembler::far_branches()) {
677 return false;
678 }
679 // codecache size > 240M
680 if (MacroAssembler::codestub_branch_needs_far_jump()) {
681 return true;
682 }
683 // codecache size: 128M..240M
684 return !CodeCache::is_non_nmethod(addr);
685 }
686
687 void MacroAssembler::far_call(Address entry, Register tmp) {
688 assert(ReservedCodeCacheSize < 4*G, "branch out of range");
689 assert(CodeCache::find_blob(entry.target()) != nullptr,
690 "destination of far call not found in code cache");
691 assert(entry.rspec().type() == relocInfo::external_word_type
692 || entry.rspec().type() == relocInfo::runtime_call_type
693 || entry.rspec().type() == relocInfo::none, "wrong entry relocInfo type");
694 if (target_needs_far_branch(entry.target())) {
695 uint64_t offset;
696 // We can use ADRP here because we know that the total size of
697 // the code cache cannot exceed 2Gb (ADRP limit is 4GB).
698 adrp(tmp, entry, offset);
699 add(tmp, tmp, offset);
700 blr(tmp);
701 } else {
702 bl(entry);
703 }
704 }
705
706 int MacroAssembler::far_jump(Address entry, Register tmp) {
707 assert(ReservedCodeCacheSize < 4*G, "branch out of range");
708 assert(CodeCache::find_blob(entry.target()) != nullptr,
709 "destination of far call not found in code cache");
710 assert(entry.rspec().type() == relocInfo::external_word_type
711 || entry.rspec().type() == relocInfo::runtime_call_type
712 || entry.rspec().type() == relocInfo::none, "wrong entry relocInfo type");
713 address start = pc();
714 if (target_needs_far_branch(entry.target())) {
715 uint64_t offset;
716 // We can use ADRP here because we know that the total size of
717 // the code cache cannot exceed 2Gb (ADRP limit is 4GB).
718 adrp(tmp, entry, offset);
719 add(tmp, tmp, offset);
720 br(tmp);
721 } else {
722 b(entry);
723 }
724 return pc() - start;
725 }
726
727 void MacroAssembler::reserved_stack_check() {
728 // testing if reserved zone needs to be enabled
729 Label no_reserved_zone_enabling;
730
731 ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
732 cmp(sp, rscratch1);
733 br(Assembler::LO, no_reserved_zone_enabling);
734
735 enter(); // LR and FP are live.
736 lea(rscratch1, CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone));
737 mov(c_rarg0, rthread);
738 blr(rscratch1);
739 leave();
740
741 // We have already removed our own frame.
742 // throw_delayed_StackOverflowError will think that it's been
743 // called by our caller.
744 lea(rscratch1, RuntimeAddress(StubRoutines::throw_delayed_StackOverflowError_entry()));
745 br(rscratch1);
746 should_not_reach_here();
747
748 bind(no_reserved_zone_enabling);
749 }
750
751 static void pass_arg0(MacroAssembler* masm, Register arg) {
752 if (c_rarg0 != arg ) {
753 masm->mov(c_rarg0, arg);
754 }
755 }
756
757 static void pass_arg1(MacroAssembler* masm, Register arg) {
758 if (c_rarg1 != arg ) {
759 masm->mov(c_rarg1, arg);
760 }
761 }
762
763 static void pass_arg2(MacroAssembler* masm, Register arg) {
764 if (c_rarg2 != arg ) {
765 masm->mov(c_rarg2, arg);
766 }
767 }
768
769 static void pass_arg3(MacroAssembler* masm, Register arg) {
770 if (c_rarg3 != arg ) {
771 masm->mov(c_rarg3, arg);
772 }
773 }
774
775 void MacroAssembler::call_VM_base(Register oop_result,
776 Register java_thread,
777 Register last_java_sp,
778 address entry_point,
779 int number_of_arguments,
780 bool check_exceptions) {
781 // determine java_thread register
782 if (!java_thread->is_valid()) {
783 java_thread = rthread;
784 }
785
786 // determine last_java_sp register
787 if (!last_java_sp->is_valid()) {
788 last_java_sp = esp;
789 }
790
791 // debugging support
792 assert(number_of_arguments >= 0 , "cannot have negative number of arguments");
793 assert(java_thread == rthread, "unexpected register");
794 #ifdef ASSERT
795 // TraceBytecodes does not use r12 but saves it over the call, so don't verify
796 // if ((UseCompressedOops || UseCompressedClassPointers) && !TraceBytecodes) verify_heapbase("call_VM_base: heap base corrupted?");
797 #endif // ASSERT
798
799 assert(java_thread != oop_result , "cannot use the same register for java_thread & oop_result");
800 assert(java_thread != last_java_sp, "cannot use the same register for java_thread & last_java_sp");
801
802 // push java thread (becomes first argument of C function)
803
804 mov(c_rarg0, java_thread);
805
806 // set last Java frame before call
807 assert(last_java_sp != rfp, "can't use rfp");
808
809 Label l;
810 set_last_Java_frame(last_java_sp, rfp, l, rscratch1);
811
812 // do the call, remove parameters
813 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments, &l);
814
815 // lr could be poisoned with PAC signature during throw_pending_exception
816 // if it was tail-call optimized by compiler, since lr is not callee-saved
817 // reload it with proper value
818 adr(lr, l);
819
820 // reset last Java frame
821 // Only interpreter should have to clear fp
822 reset_last_Java_frame(true);
823
824 // C++ interp handles this in the interpreter
825 check_and_handle_popframe(java_thread);
826 check_and_handle_earlyret(java_thread);
827
828 if (check_exceptions) {
829 // check for pending exceptions (java_thread is set upon return)
830 ldr(rscratch1, Address(java_thread, in_bytes(Thread::pending_exception_offset())));
831 Label ok;
832 cbz(rscratch1, ok);
833 lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry()));
834 br(rscratch1);
835 bind(ok);
836 }
837
838 // get oop result if there is one and reset the value in the thread
839 if (oop_result->is_valid()) {
840 get_vm_result(oop_result, java_thread);
841 }
842 }
843
844 void MacroAssembler::call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) {
845 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions);
846 }
847
848 // Check the entry target is always reachable from any branch.
849 static bool is_always_within_branch_range(Address entry) {
850 const address target = entry.target();
851
852 if (!CodeCache::contains(target)) {
853 // We always use trampolines for callees outside CodeCache.
854 assert(entry.rspec().type() == relocInfo::runtime_call_type, "non-runtime call of an external target");
855 return false;
856 }
857
858 if (!MacroAssembler::far_branches()) {
859 return true;
860 }
861
862 if (entry.rspec().type() == relocInfo::runtime_call_type) {
863 // Runtime calls are calls of a non-compiled method (stubs, adapters).
864 // Non-compiled methods stay forever in CodeCache.
865 // We check whether the longest possible branch is within the branch range.
866 assert(CodeCache::find_blob(target) != nullptr &&
867 !CodeCache::find_blob(target)->is_compiled(),
868 "runtime call of compiled method");
869 const address right_longest_branch_start = CodeCache::high_bound() - NativeInstruction::instruction_size;
870 const address left_longest_branch_start = CodeCache::low_bound();
871 const bool is_reachable = Assembler::reachable_from_branch_at(left_longest_branch_start, target) &&
872 Assembler::reachable_from_branch_at(right_longest_branch_start, target);
873 return is_reachable;
874 }
875
876 return false;
877 }
878
879 // Maybe emit a call via a trampoline. If the code cache is small
880 // trampolines won't be emitted.
881 address MacroAssembler::trampoline_call(Address entry) {
882 assert(entry.rspec().type() == relocInfo::runtime_call_type
883 || entry.rspec().type() == relocInfo::opt_virtual_call_type
884 || entry.rspec().type() == relocInfo::static_call_type
885 || entry.rspec().type() == relocInfo::virtual_call_type, "wrong reloc type");
886
887 address target = entry.target();
888
889 if (!is_always_within_branch_range(entry)) {
890 if (!in_scratch_emit_size()) {
891 // We don't want to emit a trampoline if C2 is generating dummy
892 // code during its branch shortening phase.
893 if (entry.rspec().type() == relocInfo::runtime_call_type) {
894 assert(CodeBuffer::supports_shared_stubs(), "must support shared stubs");
895 code()->share_trampoline_for(entry.target(), offset());
896 } else {
897 address stub = emit_trampoline_stub(offset(), target);
898 if (stub == nullptr) {
899 postcond(pc() == badAddress);
900 return nullptr; // CodeCache is full
901 }
902 }
903 }
904 target = pc();
905 }
906
907 address call_pc = pc();
908 relocate(entry.rspec());
909 bl(target);
910
911 postcond(pc() != badAddress);
912 return call_pc;
913 }
914
915 // Emit a trampoline stub for a call to a target which is too far away.
916 //
917 // code sequences:
918 //
919 // call-site:
920 // branch-and-link to <destination> or <trampoline stub>
921 //
922 // Related trampoline stub for this call site in the stub section:
923 // load the call target from the constant pool
924 // branch (LR still points to the call site above)
925
926 address MacroAssembler::emit_trampoline_stub(int insts_call_instruction_offset,
927 address dest) {
928 // Max stub size: alignment nop, TrampolineStub.
929 address stub = start_a_stub(max_trampoline_stub_size());
930 if (stub == nullptr) {
931 return nullptr; // CodeBuffer::expand failed
932 }
933
934 // Create a trampoline stub relocation which relates this trampoline stub
935 // with the call instruction at insts_call_instruction_offset in the
936 // instructions code-section.
937 align(wordSize);
938 relocate(trampoline_stub_Relocation::spec(code()->insts()->start()
939 + insts_call_instruction_offset));
940 const int stub_start_offset = offset();
941
942 // Now, create the trampoline stub's code:
943 // - load the call
944 // - call
945 Label target;
946 ldr(rscratch1, target);
947 br(rscratch1);
948 bind(target);
949 assert(offset() - stub_start_offset == NativeCallTrampolineStub::data_offset,
950 "should be");
951 emit_int64((int64_t)dest);
952
953 const address stub_start_addr = addr_at(stub_start_offset);
954
955 assert(is_NativeCallTrampolineStub_at(stub_start_addr), "doesn't look like a trampoline");
956
957 end_a_stub();
958 return stub_start_addr;
959 }
960
961 int MacroAssembler::max_trampoline_stub_size() {
962 // Max stub size: alignment nop, TrampolineStub.
963 return NativeInstruction::instruction_size + NativeCallTrampolineStub::instruction_size;
964 }
965
966 void MacroAssembler::emit_static_call_stub() {
967 // CompiledDirectStaticCall::set_to_interpreted knows the
968 // exact layout of this stub.
969
970 isb();
971 mov_metadata(rmethod, nullptr);
972
973 // Jump to the entry point of the c2i stub.
974 movptr(rscratch1, 0);
975 br(rscratch1);
976 }
977
978 int MacroAssembler::static_call_stub_size() {
979 // isb; movk; movz; movz; movk; movz; movz; br
980 return 8 * NativeInstruction::instruction_size;
981 }
982
983 void MacroAssembler::c2bool(Register x) {
984 // implements x == 0 ? 0 : 1
985 // note: must only look at least-significant byte of x
986 // since C-style booleans are stored in one byte
987 // only! (was bug)
988 tst(x, 0xff);
989 cset(x, Assembler::NE);
990 }
991
992 address MacroAssembler::ic_call(address entry, jint method_index) {
993 RelocationHolder rh = virtual_call_Relocation::spec(pc(), method_index);
994 // address const_ptr = long_constant((jlong)Universe::non_oop_word());
995 // uintptr_t offset;
996 // ldr_constant(rscratch2, const_ptr);
997 movptr(rscratch2, (uintptr_t)Universe::non_oop_word());
998 return trampoline_call(Address(entry, rh));
999 }
1000
1001 // Implementation of call_VM versions
1002
1003 void MacroAssembler::call_VM(Register oop_result,
1004 address entry_point,
1005 bool check_exceptions) {
1006 call_VM_helper(oop_result, entry_point, 0, check_exceptions);
1007 }
1008
1009 void MacroAssembler::call_VM(Register oop_result,
1010 address entry_point,
1011 Register arg_1,
1012 bool check_exceptions) {
1013 pass_arg1(this, arg_1);
1014 call_VM_helper(oop_result, entry_point, 1, check_exceptions);
1015 }
1016
1017 void MacroAssembler::call_VM(Register oop_result,
1018 address entry_point,
1019 Register arg_1,
1020 Register arg_2,
1021 bool check_exceptions) {
1022 assert(arg_1 != c_rarg2, "smashed arg");
1023 pass_arg2(this, arg_2);
1024 pass_arg1(this, arg_1);
1025 call_VM_helper(oop_result, entry_point, 2, check_exceptions);
1026 }
1027
1028 void MacroAssembler::call_VM(Register oop_result,
1029 address entry_point,
1030 Register arg_1,
1031 Register arg_2,
1032 Register arg_3,
1033 bool check_exceptions) {
1034 assert(arg_1 != c_rarg3, "smashed arg");
1035 assert(arg_2 != c_rarg3, "smashed arg");
1036 pass_arg3(this, arg_3);
1037
1038 assert(arg_1 != c_rarg2, "smashed arg");
1039 pass_arg2(this, arg_2);
1040
1041 pass_arg1(this, arg_1);
1042 call_VM_helper(oop_result, entry_point, 3, check_exceptions);
1043 }
1044
1045 void MacroAssembler::call_VM(Register oop_result,
1046 Register last_java_sp,
1047 address entry_point,
1048 int number_of_arguments,
1049 bool check_exceptions) {
1050 call_VM_base(oop_result, rthread, last_java_sp, entry_point, number_of_arguments, check_exceptions);
1051 }
1052
1053 void MacroAssembler::call_VM(Register oop_result,
1054 Register last_java_sp,
1055 address entry_point,
1056 Register arg_1,
1057 bool check_exceptions) {
1058 pass_arg1(this, arg_1);
1059 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions);
1060 }
1061
1062 void MacroAssembler::call_VM(Register oop_result,
1063 Register last_java_sp,
1064 address entry_point,
1065 Register arg_1,
1066 Register arg_2,
1067 bool check_exceptions) {
1068
1069 assert(arg_1 != c_rarg2, "smashed arg");
1070 pass_arg2(this, arg_2);
1071 pass_arg1(this, arg_1);
1072 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions);
1073 }
1074
1075 void MacroAssembler::call_VM(Register oop_result,
1076 Register last_java_sp,
1077 address entry_point,
1078 Register arg_1,
1079 Register arg_2,
1080 Register arg_3,
1081 bool check_exceptions) {
1082 assert(arg_1 != c_rarg3, "smashed arg");
1083 assert(arg_2 != c_rarg3, "smashed arg");
1084 pass_arg3(this, arg_3);
1085 assert(arg_1 != c_rarg2, "smashed arg");
1086 pass_arg2(this, arg_2);
1087 pass_arg1(this, arg_1);
1088 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions);
1089 }
1090
1091
1092 void MacroAssembler::get_vm_result(Register oop_result, Register java_thread) {
1093 ldr(oop_result, Address(java_thread, JavaThread::vm_result_offset()));
1094 str(zr, Address(java_thread, JavaThread::vm_result_offset()));
1095 verify_oop_msg(oop_result, "broken oop in call_VM_base");
1096 }
1097
1098 void MacroAssembler::get_vm_result_2(Register metadata_result, Register java_thread) {
1099 ldr(metadata_result, Address(java_thread, JavaThread::vm_result_2_offset()));
1100 str(zr, Address(java_thread, JavaThread::vm_result_2_offset()));
1101 }
1102
1103 void MacroAssembler::align(int modulus) {
1104 while (offset() % modulus != 0) nop();
1105 }
1106
1107 void MacroAssembler::post_call_nop() {
1108 if (!Continuations::enabled()) {
1109 return;
1110 }
1111 InstructionMark im(this);
1112 relocate(post_call_nop_Relocation::spec());
1113 InlineSkippedInstructionsCounter skipCounter(this);
1114 nop();
1115 movk(zr, 0);
1116 movk(zr, 0);
1117 }
1118
1119 // these are no-ops overridden by InterpreterMacroAssembler
1120
1121 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { }
1122
1123 void MacroAssembler::check_and_handle_popframe(Register java_thread) { }
1124
1125 // Look up the method for a megamorphic invokeinterface call.
1126 // The target method is determined by <intf_klass, itable_index>.
1127 // The receiver klass is in recv_klass.
1128 // On success, the result will be in method_result, and execution falls through.
1129 // On failure, execution transfers to the given label.
1130 void MacroAssembler::lookup_interface_method(Register recv_klass,
1131 Register intf_klass,
1132 RegisterOrConstant itable_index,
1133 Register method_result,
1134 Register scan_temp,
1135 Label& L_no_such_interface,
1136 bool return_method) {
1137 assert_different_registers(recv_klass, intf_klass, scan_temp);
1138 assert_different_registers(method_result, intf_klass, scan_temp);
1139 assert(recv_klass != method_result || !return_method,
1140 "recv_klass can be destroyed when method isn't needed");
1141 assert(itable_index.is_constant() || itable_index.as_register() == method_result,
1142 "caller must use same register for non-constant itable index as for method");
1143
1144 // Compute start of first itableOffsetEntry (which is at the end of the vtable)
1145 int vtable_base = in_bytes(Klass::vtable_start_offset());
1146 int itentry_off = in_bytes(itableMethodEntry::method_offset());
1147 int scan_step = itableOffsetEntry::size() * wordSize;
1148 int vte_size = vtableEntry::size_in_bytes();
1149 assert(vte_size == wordSize, "else adjust times_vte_scale");
1150
1151 ldrw(scan_temp, Address(recv_klass, Klass::vtable_length_offset()));
1152
1153 // %%% Could store the aligned, prescaled offset in the klassoop.
1154 // lea(scan_temp, Address(recv_klass, scan_temp, times_vte_scale, vtable_base));
1155 lea(scan_temp, Address(recv_klass, scan_temp, Address::lsl(3)));
1156 add(scan_temp, scan_temp, vtable_base);
1157
1158 if (return_method) {
1159 // Adjust recv_klass by scaled itable_index, so we can free itable_index.
1160 assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
1161 // lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off));
1162 lea(recv_klass, Address(recv_klass, itable_index, Address::lsl(3)));
1163 if (itentry_off)
1164 add(recv_klass, recv_klass, itentry_off);
1165 }
1166
1167 // for (scan = klass->itable(); scan->interface() != nullptr; scan += scan_step) {
1168 // if (scan->interface() == intf) {
1169 // result = (klass + scan->offset() + itable_index);
1170 // }
1171 // }
1172 Label search, found_method;
1173
1174 ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset()));
1175 cmp(intf_klass, method_result);
1176 br(Assembler::EQ, found_method);
1177 bind(search);
1178 // Check that the previous entry is non-null. A null entry means that
1179 // the receiver class doesn't implement the interface, and wasn't the
1180 // same as when the caller was compiled.
1181 cbz(method_result, L_no_such_interface);
1182 if (itableOffsetEntry::interface_offset() != 0) {
1183 add(scan_temp, scan_temp, scan_step);
1184 ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset()));
1185 } else {
1186 ldr(method_result, Address(pre(scan_temp, scan_step)));
1187 }
1188 cmp(intf_klass, method_result);
1189 br(Assembler::NE, search);
1190
1191 bind(found_method);
1192
1193 // Got a hit.
1194 if (return_method) {
1195 ldrw(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset()));
1196 ldr(method_result, Address(recv_klass, scan_temp, Address::uxtw(0)));
1197 }
1198 }
1199
1200 // virtual method calling
1201 void MacroAssembler::lookup_virtual_method(Register recv_klass,
1202 RegisterOrConstant vtable_index,
1203 Register method_result) {
1204 assert(vtableEntry::size() * wordSize == 8,
1205 "adjust the scaling in the code below");
1206 int64_t vtable_offset_in_bytes = in_bytes(Klass::vtable_start_offset() + vtableEntry::method_offset());
1207
1208 if (vtable_index.is_register()) {
1209 lea(method_result, Address(recv_klass,
1210 vtable_index.as_register(),
1211 Address::lsl(LogBytesPerWord)));
1212 ldr(method_result, Address(method_result, vtable_offset_in_bytes));
1213 } else {
1214 vtable_offset_in_bytes += vtable_index.as_constant() * wordSize;
1215 ldr(method_result,
1216 form_address(rscratch1, recv_klass, vtable_offset_in_bytes, 0));
1217 }
1218 }
1219
1220 void MacroAssembler::check_klass_subtype(Register sub_klass,
1221 Register super_klass,
1222 Register temp_reg,
1223 Label& L_success) {
1224 Label L_failure;
1225 check_klass_subtype_fast_path(sub_klass, super_klass, temp_reg, &L_success, &L_failure, nullptr);
1226 check_klass_subtype_slow_path(sub_klass, super_klass, temp_reg, noreg, &L_success, nullptr);
1227 bind(L_failure);
1228 }
1229
1230
1231 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
1232 Register super_klass,
1233 Register temp_reg,
1234 Label* L_success,
1235 Label* L_failure,
1236 Label* L_slow_path,
1237 RegisterOrConstant super_check_offset) {
1238 assert_different_registers(sub_klass, super_klass, temp_reg);
1239 bool must_load_sco = (super_check_offset.constant_or_zero() == -1);
1240 if (super_check_offset.is_register()) {
1241 assert_different_registers(sub_klass, super_klass,
1242 super_check_offset.as_register());
1243 } else if (must_load_sco) {
1244 assert(temp_reg != noreg, "supply either a temp or a register offset");
1245 }
1246
1247 Label L_fallthrough;
1248 int label_nulls = 0;
1249 if (L_success == nullptr) { L_success = &L_fallthrough; label_nulls++; }
1250 if (L_failure == nullptr) { L_failure = &L_fallthrough; label_nulls++; }
1251 if (L_slow_path == nullptr) { L_slow_path = &L_fallthrough; label_nulls++; }
1252 assert(label_nulls <= 1, "at most one null in the batch");
1253
1254 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
1255 int sco_offset = in_bytes(Klass::super_check_offset_offset());
1256 Address super_check_offset_addr(super_klass, sco_offset);
1257
1258 // Hacked jmp, which may only be used just before L_fallthrough.
1259 #define final_jmp(label) \
1260 if (&(label) == &L_fallthrough) { /*do nothing*/ } \
1261 else b(label) /*omit semi*/
1262
1263 // If the pointers are equal, we are done (e.g., String[] elements).
1264 // This self-check enables sharing of secondary supertype arrays among
1265 // non-primary types such as array-of-interface. Otherwise, each such
1266 // type would need its own customized SSA.
1267 // We move this check to the front of the fast path because many
1268 // type checks are in fact trivially successful in this manner,
1269 // so we get a nicely predicted branch right at the start of the check.
1270 cmp(sub_klass, super_klass);
1271 br(Assembler::EQ, *L_success);
1272
1273 // Check the supertype display:
1274 if (must_load_sco) {
1275 ldrw(temp_reg, super_check_offset_addr);
1276 super_check_offset = RegisterOrConstant(temp_reg);
1277 }
1278 Address super_check_addr(sub_klass, super_check_offset);
1279 ldr(rscratch1, super_check_addr);
1280 cmp(super_klass, rscratch1); // load displayed supertype
1281
1282 // This check has worked decisively for primary supers.
1283 // Secondary supers are sought in the super_cache ('super_cache_addr').
1284 // (Secondary supers are interfaces and very deeply nested subtypes.)
1285 // This works in the same check above because of a tricky aliasing
1286 // between the super_cache and the primary super display elements.
1287 // (The 'super_check_addr' can address either, as the case requires.)
1288 // Note that the cache is updated below if it does not help us find
1289 // what we need immediately.
1290 // So if it was a primary super, we can just fail immediately.
1291 // Otherwise, it's the slow path for us (no success at this point).
1292
1293 if (super_check_offset.is_register()) {
1294 br(Assembler::EQ, *L_success);
1295 subs(zr, super_check_offset.as_register(), sc_offset);
1296 if (L_failure == &L_fallthrough) {
1297 br(Assembler::EQ, *L_slow_path);
1298 } else {
1299 br(Assembler::NE, *L_failure);
1300 final_jmp(*L_slow_path);
1301 }
1302 } else if (super_check_offset.as_constant() == sc_offset) {
1303 // Need a slow path; fast failure is impossible.
1304 if (L_slow_path == &L_fallthrough) {
1305 br(Assembler::EQ, *L_success);
1306 } else {
1307 br(Assembler::NE, *L_slow_path);
1308 final_jmp(*L_success);
1309 }
1310 } else {
1311 // No slow path; it's a fast decision.
1312 if (L_failure == &L_fallthrough) {
1313 br(Assembler::EQ, *L_success);
1314 } else {
1315 br(Assembler::NE, *L_failure);
1316 final_jmp(*L_success);
1317 }
1318 }
1319
1320 bind(L_fallthrough);
1321
1322 #undef final_jmp
1323 }
1324
1325 // These two are taken from x86, but they look generally useful
1326
1327 // scans count pointer sized words at [addr] for occurrence of value,
1328 // generic
1329 void MacroAssembler::repne_scan(Register addr, Register value, Register count,
1330 Register scratch) {
1331 Label Lloop, Lexit;
1332 cbz(count, Lexit);
1333 bind(Lloop);
1334 ldr(scratch, post(addr, wordSize));
1335 cmp(value, scratch);
1336 br(EQ, Lexit);
1337 sub(count, count, 1);
1338 cbnz(count, Lloop);
1339 bind(Lexit);
1340 }
1341
1342 // scans count 4 byte words at [addr] for occurrence of value,
1343 // generic
1344 void MacroAssembler::repne_scanw(Register addr, Register value, Register count,
1345 Register scratch) {
1346 Label Lloop, Lexit;
1347 cbz(count, Lexit);
1348 bind(Lloop);
1349 ldrw(scratch, post(addr, wordSize));
1350 cmpw(value, scratch);
1351 br(EQ, Lexit);
1352 sub(count, count, 1);
1353 cbnz(count, Lloop);
1354 bind(Lexit);
1355 }
1356
1357 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
1358 Register super_klass,
1359 Register temp_reg,
1360 Register temp2_reg,
1361 Label* L_success,
1362 Label* L_failure,
1363 bool set_cond_codes) {
1364 assert_different_registers(sub_klass, super_klass, temp_reg);
1365 if (temp2_reg != noreg)
1366 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg, rscratch1);
1367 #define IS_A_TEMP(reg) ((reg) == temp_reg || (reg) == temp2_reg)
1368
1369 Label L_fallthrough;
1370 int label_nulls = 0;
1371 if (L_success == nullptr) { L_success = &L_fallthrough; label_nulls++; }
1372 if (L_failure == nullptr) { L_failure = &L_fallthrough; label_nulls++; }
1373 assert(label_nulls <= 1, "at most one null in the batch");
1374
1375 // a couple of useful fields in sub_klass:
1376 int ss_offset = in_bytes(Klass::secondary_supers_offset());
1377 int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
1378 Address secondary_supers_addr(sub_klass, ss_offset);
1379 Address super_cache_addr( sub_klass, sc_offset);
1380
1381 BLOCK_COMMENT("check_klass_subtype_slow_path");
1382
1383 // Do a linear scan of the secondary super-klass chain.
1384 // This code is rarely used, so simplicity is a virtue here.
1385 // The repne_scan instruction uses fixed registers, which we must spill.
1386 // Don't worry too much about pre-existing connections with the input regs.
1387
1388 assert(sub_klass != r0, "killed reg"); // killed by mov(r0, super)
1389 assert(sub_klass != r2, "killed reg"); // killed by lea(r2, &pst_counter)
1390
1391 RegSet pushed_registers;
1392 if (!IS_A_TEMP(r2)) pushed_registers += r2;
1393 if (!IS_A_TEMP(r5)) pushed_registers += r5;
1394
1395 if (super_klass != r0) {
1396 if (!IS_A_TEMP(r0)) pushed_registers += r0;
1397 }
1398
1399 push(pushed_registers, sp);
1400
1401 // Get super_klass value into r0 (even if it was in r5 or r2).
1402 if (super_klass != r0) {
1403 mov(r0, super_klass);
1404 }
1405
1406 #ifndef PRODUCT
1407 mov(rscratch2, (address)&SharedRuntime::_partial_subtype_ctr);
1408 Address pst_counter_addr(rscratch2);
1409 ldr(rscratch1, pst_counter_addr);
1410 add(rscratch1, rscratch1, 1);
1411 str(rscratch1, pst_counter_addr);
1412 #endif //PRODUCT
1413
1414 // We will consult the secondary-super array.
1415 ldr(r5, secondary_supers_addr);
1416 // Load the array length.
1417 ldrw(r2, Address(r5, Array<Klass*>::length_offset_in_bytes()));
1418 // Skip to start of data.
1419 add(r5, r5, Array<Klass*>::base_offset_in_bytes());
1420
1421 cmp(sp, zr); // Clear Z flag; SP is never zero
1422 // Scan R2 words at [R5] for an occurrence of R0.
1423 // Set NZ/Z based on last compare.
1424 repne_scan(r5, r0, r2, rscratch1);
1425
1426 // Unspill the temp. registers:
1427 pop(pushed_registers, sp);
1428
1429 br(Assembler::NE, *L_failure);
1430
1431 // Success. Cache the super we found and proceed in triumph.
1432 str(super_klass, super_cache_addr);
1433
1434 if (L_success != &L_fallthrough) {
1435 b(*L_success);
1436 }
1437
1438 #undef IS_A_TEMP
1439
1440 bind(L_fallthrough);
1441 }
1442
1443 void MacroAssembler::clinit_barrier(Register klass, Register scratch, Label* L_fast_path, Label* L_slow_path) {
1444 assert(L_fast_path != nullptr || L_slow_path != nullptr, "at least one is required");
1445 assert_different_registers(klass, rthread, scratch);
1446
1447 Label L_fallthrough, L_tmp;
1448 if (L_fast_path == nullptr) {
1449 L_fast_path = &L_fallthrough;
1450 } else if (L_slow_path == nullptr) {
1451 L_slow_path = &L_fallthrough;
1452 }
1453 // Fast path check: class is fully initialized
1454 ldrb(scratch, Address(klass, InstanceKlass::init_state_offset()));
1455 subs(zr, scratch, InstanceKlass::fully_initialized);
1456 br(Assembler::EQ, *L_fast_path);
1457
1458 // Fast path check: current thread is initializer thread
1459 ldr(scratch, Address(klass, InstanceKlass::init_thread_offset()));
1460 cmp(rthread, scratch);
1461
1462 if (L_slow_path == &L_fallthrough) {
1463 br(Assembler::EQ, *L_fast_path);
1464 bind(*L_slow_path);
1465 } else if (L_fast_path == &L_fallthrough) {
1466 br(Assembler::NE, *L_slow_path);
1467 bind(*L_fast_path);
1468 } else {
1469 Unimplemented();
1470 }
1471 }
1472
1473 void MacroAssembler::_verify_oop(Register reg, const char* s, const char* file, int line) {
1474 if (!VerifyOops) return;
1475
1476 // Pass register number to verify_oop_subroutine
1477 const char* b = nullptr;
1478 {
1479 ResourceMark rm;
1480 stringStream ss;
1481 ss.print("verify_oop: %s: %s (%s:%d)", reg->name(), s, file, line);
1482 b = code_string(ss.as_string());
1483 }
1484 BLOCK_COMMENT("verify_oop {");
1485
1486 strip_return_address(); // This might happen within a stack frame.
1487 protect_return_address();
1488 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
1489 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
1490
1491 mov(r0, reg);
1492 movptr(rscratch1, (uintptr_t)(address)b);
1493
1494 // call indirectly to solve generation ordering problem
1495 lea(rscratch2, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address()));
1496 ldr(rscratch2, Address(rscratch2));
1497 blr(rscratch2);
1498
1499 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize)));
1500 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize)));
1501 authenticate_return_address();
1502
1503 BLOCK_COMMENT("} verify_oop");
1504 }
1505
1506 void MacroAssembler::_verify_oop_addr(Address addr, const char* s, const char* file, int line) {
1507 if (!VerifyOops) return;
1508
1509 const char* b = nullptr;
1510 {
1511 ResourceMark rm;
1512 stringStream ss;
1513 ss.print("verify_oop_addr: %s (%s:%d)", s, file, line);
1514 b = code_string(ss.as_string());
1515 }
1516 BLOCK_COMMENT("verify_oop_addr {");
1517
1518 strip_return_address(); // This might happen within a stack frame.
1519 protect_return_address();
1520 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize)));
1521 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize)));
1522
1523 // addr may contain sp so we will have to adjust it based on the
1524 // pushes that we just did.
1525 if (addr.uses(sp)) {
1526 lea(r0, addr);
1527 ldr(r0, Address(r0, 4 * wordSize));
1528 } else {
1529 ldr(r0, addr);
1530 }
1531 movptr(rscratch1, (uintptr_t)(address)b);
1532
1533 // call indirectly to solve generation ordering problem
1534 lea(rscratch2, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address()));
1535 ldr(rscratch2, Address(rscratch2));
1536 blr(rscratch2);
1537
1538 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize)));
1539 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize)));
1540 authenticate_return_address();
1541
1542 BLOCK_COMMENT("} verify_oop_addr");
1543 }
1544
1545 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
1546 int extra_slot_offset) {
1547 // cf. TemplateTable::prepare_invoke(), if (load_receiver).
1548 int stackElementSize = Interpreter::stackElementSize;
1549 int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0);
1550 #ifdef ASSERT
1551 int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1);
1552 assert(offset1 - offset == stackElementSize, "correct arithmetic");
1553 #endif
1554 if (arg_slot.is_constant()) {
1555 return Address(esp, arg_slot.as_constant() * stackElementSize
1556 + offset);
1557 } else {
1558 add(rscratch1, esp, arg_slot.as_register(),
1559 ext::uxtx, exact_log2(stackElementSize));
1560 return Address(rscratch1, offset);
1561 }
1562 }
1563
1564 void MacroAssembler::call_VM_leaf_base(address entry_point,
1565 int number_of_arguments,
1566 Label *retaddr) {
1567 Label E, L;
1568
1569 stp(rscratch1, rmethod, Address(pre(sp, -2 * wordSize)));
1570
1571 mov(rscratch1, entry_point);
1572 blr(rscratch1);
1573 if (retaddr)
1574 bind(*retaddr);
1575
1576 ldp(rscratch1, rmethod, Address(post(sp, 2 * wordSize)));
1577 }
1578
1579 void MacroAssembler::call_VM_leaf(address entry_point, int number_of_arguments) {
1580 call_VM_leaf_base(entry_point, number_of_arguments);
1581 }
1582
1583 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0) {
1584 pass_arg0(this, arg_0);
1585 call_VM_leaf_base(entry_point, 1);
1586 }
1587
1588 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
1589 pass_arg0(this, arg_0);
1590 pass_arg1(this, arg_1);
1591 call_VM_leaf_base(entry_point, 2);
1592 }
1593
1594 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0,
1595 Register arg_1, Register arg_2) {
1596 pass_arg0(this, arg_0);
1597 pass_arg1(this, arg_1);
1598 pass_arg2(this, arg_2);
1599 call_VM_leaf_base(entry_point, 3);
1600 }
1601
1602 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) {
1603 pass_arg0(this, arg_0);
1604 MacroAssembler::call_VM_leaf_base(entry_point, 1);
1605 }
1606
1607 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) {
1608
1609 assert(arg_0 != c_rarg1, "smashed arg");
1610 pass_arg1(this, arg_1);
1611 pass_arg0(this, arg_0);
1612 MacroAssembler::call_VM_leaf_base(entry_point, 2);
1613 }
1614
1615 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) {
1616 assert(arg_0 != c_rarg2, "smashed arg");
1617 assert(arg_1 != c_rarg2, "smashed arg");
1618 pass_arg2(this, arg_2);
1619 assert(arg_0 != c_rarg1, "smashed arg");
1620 pass_arg1(this, arg_1);
1621 pass_arg0(this, arg_0);
1622 MacroAssembler::call_VM_leaf_base(entry_point, 3);
1623 }
1624
1625 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) {
1626 assert(arg_0 != c_rarg3, "smashed arg");
1627 assert(arg_1 != c_rarg3, "smashed arg");
1628 assert(arg_2 != c_rarg3, "smashed arg");
1629 pass_arg3(this, arg_3);
1630 assert(arg_0 != c_rarg2, "smashed arg");
1631 assert(arg_1 != c_rarg2, "smashed arg");
1632 pass_arg2(this, arg_2);
1633 assert(arg_0 != c_rarg1, "smashed arg");
1634 pass_arg1(this, arg_1);
1635 pass_arg0(this, arg_0);
1636 MacroAssembler::call_VM_leaf_base(entry_point, 4);
1637 }
1638
1639 void MacroAssembler::null_check(Register reg, int offset) {
1640 if (needs_explicit_null_check(offset)) {
1641 // provoke OS null exception if reg is null by
1642 // accessing M[reg] w/o changing any registers
1643 // NOTE: this is plenty to provoke a segv
1644 ldr(zr, Address(reg));
1645 } else {
1646 // nothing to do, (later) access of M[reg + offset]
1647 // will provoke OS null exception if reg is null
1648 }
1649 }
1650
1651 // MacroAssembler protected routines needed to implement
1652 // public methods
1653
1654 void MacroAssembler::mov(Register r, Address dest) {
1655 code_section()->relocate(pc(), dest.rspec());
1656 uint64_t imm64 = (uint64_t)dest.target();
1657 movptr(r, imm64);
1658 }
1659
1660 // Move a constant pointer into r. In AArch64 mode the virtual
1661 // address space is 48 bits in size, so we only need three
1662 // instructions to create a patchable instruction sequence that can
1663 // reach anywhere.
1664 void MacroAssembler::movptr(Register r, uintptr_t imm64) {
1665 #ifndef PRODUCT
1666 {
1667 char buffer[64];
1668 snprintf(buffer, sizeof(buffer), "0x%" PRIX64, (uint64_t)imm64);
1669 block_comment(buffer);
1670 }
1671 #endif
1672 assert(imm64 < (1ull << 48), "48-bit overflow in address constant");
1673 movz(r, imm64 & 0xffff);
1674 imm64 >>= 16;
1675 movk(r, imm64 & 0xffff, 16);
1676 imm64 >>= 16;
1677 movk(r, imm64 & 0xffff, 32);
1678 }
1679
1680 // Macro to mov replicated immediate to vector register.
1681 // imm64: only the lower 8/16/32 bits are considered for B/H/S type. That is,
1682 // the upper 56/48/32 bits must be zeros for B/H/S type.
1683 // Vd will get the following values for different arrangements in T
1684 // imm64 == hex 000000gh T8B: Vd = ghghghghghghghgh
1685 // imm64 == hex 000000gh T16B: Vd = ghghghghghghghghghghghghghghghgh
1686 // imm64 == hex 0000efgh T4H: Vd = efghefghefghefgh
1687 // imm64 == hex 0000efgh T8H: Vd = efghefghefghefghefghefghefghefgh
1688 // imm64 == hex abcdefgh T2S: Vd = abcdefghabcdefgh
1689 // imm64 == hex abcdefgh T4S: Vd = abcdefghabcdefghabcdefghabcdefgh
1690 // imm64 == hex abcdefgh T1D: Vd = 00000000abcdefgh
1691 // imm64 == hex abcdefgh T2D: Vd = 00000000abcdefgh00000000abcdefgh
1692 // Clobbers rscratch1
1693 void MacroAssembler::mov(FloatRegister Vd, SIMD_Arrangement T, uint64_t imm64) {
1694 assert(T != T1Q, "unsupported");
1695 if (T == T1D || T == T2D) {
1696 int imm = operand_valid_for_movi_immediate(imm64, T);
1697 if (-1 != imm) {
1698 movi(Vd, T, imm);
1699 } else {
1700 mov(rscratch1, imm64);
1701 dup(Vd, T, rscratch1);
1702 }
1703 return;
1704 }
1705
1706 #ifdef ASSERT
1707 if (T == T8B || T == T16B) assert((imm64 & ~0xff) == 0, "extraneous bits (T8B/T16B)");
1708 if (T == T4H || T == T8H) assert((imm64 & ~0xffff) == 0, "extraneous bits (T4H/T8H)");
1709 if (T == T2S || T == T4S) assert((imm64 & ~0xffffffff) == 0, "extraneous bits (T2S/T4S)");
1710 #endif
1711 int shift = operand_valid_for_movi_immediate(imm64, T);
1712 uint32_t imm32 = imm64 & 0xffffffffULL;
1713 if (shift >= 0) {
1714 movi(Vd, T, (imm32 >> shift) & 0xff, shift);
1715 } else {
1716 movw(rscratch1, imm32);
1717 dup(Vd, T, rscratch1);
1718 }
1719 }
1720
1721 void MacroAssembler::mov_immediate64(Register dst, uint64_t imm64)
1722 {
1723 #ifndef PRODUCT
1724 {
1725 char buffer[64];
1726 snprintf(buffer, sizeof(buffer), "0x%" PRIX64, imm64);
1727 block_comment(buffer);
1728 }
1729 #endif
1730 if (operand_valid_for_logical_immediate(false, imm64)) {
1731 orr(dst, zr, imm64);
1732 } else {
1733 // we can use a combination of MOVZ or MOVN with
1734 // MOVK to build up the constant
1735 uint64_t imm_h[4];
1736 int zero_count = 0;
1737 int neg_count = 0;
1738 int i;
1739 for (i = 0; i < 4; i++) {
1740 imm_h[i] = ((imm64 >> (i * 16)) & 0xffffL);
1741 if (imm_h[i] == 0) {
1742 zero_count++;
1743 } else if (imm_h[i] == 0xffffL) {
1744 neg_count++;
1745 }
1746 }
1747 if (zero_count == 4) {
1748 // one MOVZ will do
1749 movz(dst, 0);
1750 } else if (neg_count == 4) {
1751 // one MOVN will do
1752 movn(dst, 0);
1753 } else if (zero_count == 3) {
1754 for (i = 0; i < 4; i++) {
1755 if (imm_h[i] != 0L) {
1756 movz(dst, (uint32_t)imm_h[i], (i << 4));
1757 break;
1758 }
1759 }
1760 } else if (neg_count == 3) {
1761 // one MOVN will do
1762 for (int i = 0; i < 4; i++) {
1763 if (imm_h[i] != 0xffffL) {
1764 movn(dst, (uint32_t)imm_h[i] ^ 0xffffL, (i << 4));
1765 break;
1766 }
1767 }
1768 } else if (zero_count == 2) {
1769 // one MOVZ and one MOVK will do
1770 for (i = 0; i < 3; i++) {
1771 if (imm_h[i] != 0L) {
1772 movz(dst, (uint32_t)imm_h[i], (i << 4));
1773 i++;
1774 break;
1775 }
1776 }
1777 for (;i < 4; i++) {
1778 if (imm_h[i] != 0L) {
1779 movk(dst, (uint32_t)imm_h[i], (i << 4));
1780 }
1781 }
1782 } else if (neg_count == 2) {
1783 // one MOVN and one MOVK will do
1784 for (i = 0; i < 4; i++) {
1785 if (imm_h[i] != 0xffffL) {
1786 movn(dst, (uint32_t)imm_h[i] ^ 0xffffL, (i << 4));
1787 i++;
1788 break;
1789 }
1790 }
1791 for (;i < 4; i++) {
1792 if (imm_h[i] != 0xffffL) {
1793 movk(dst, (uint32_t)imm_h[i], (i << 4));
1794 }
1795 }
1796 } else if (zero_count == 1) {
1797 // one MOVZ and two MOVKs will do
1798 for (i = 0; i < 4; i++) {
1799 if (imm_h[i] != 0L) {
1800 movz(dst, (uint32_t)imm_h[i], (i << 4));
1801 i++;
1802 break;
1803 }
1804 }
1805 for (;i < 4; i++) {
1806 if (imm_h[i] != 0x0L) {
1807 movk(dst, (uint32_t)imm_h[i], (i << 4));
1808 }
1809 }
1810 } else if (neg_count == 1) {
1811 // one MOVN and two MOVKs will do
1812 for (i = 0; i < 4; i++) {
1813 if (imm_h[i] != 0xffffL) {
1814 movn(dst, (uint32_t)imm_h[i] ^ 0xffffL, (i << 4));
1815 i++;
1816 break;
1817 }
1818 }
1819 for (;i < 4; i++) {
1820 if (imm_h[i] != 0xffffL) {
1821 movk(dst, (uint32_t)imm_h[i], (i << 4));
1822 }
1823 }
1824 } else {
1825 // use a MOVZ and 3 MOVKs (makes it easier to debug)
1826 movz(dst, (uint32_t)imm_h[0], 0);
1827 for (i = 1; i < 4; i++) {
1828 movk(dst, (uint32_t)imm_h[i], (i << 4));
1829 }
1830 }
1831 }
1832 }
1833
1834 void MacroAssembler::mov_immediate32(Register dst, uint32_t imm32)
1835 {
1836 #ifndef PRODUCT
1837 {
1838 char buffer[64];
1839 snprintf(buffer, sizeof(buffer), "0x%" PRIX32, imm32);
1840 block_comment(buffer);
1841 }
1842 #endif
1843 if (operand_valid_for_logical_immediate(true, imm32)) {
1844 orrw(dst, zr, imm32);
1845 } else {
1846 // we can use MOVZ, MOVN or two calls to MOVK to build up the
1847 // constant
1848 uint32_t imm_h[2];
1849 imm_h[0] = imm32 & 0xffff;
1850 imm_h[1] = ((imm32 >> 16) & 0xffff);
1851 if (imm_h[0] == 0) {
1852 movzw(dst, imm_h[1], 16);
1853 } else if (imm_h[0] == 0xffff) {
1854 movnw(dst, imm_h[1] ^ 0xffff, 16);
1855 } else if (imm_h[1] == 0) {
1856 movzw(dst, imm_h[0], 0);
1857 } else if (imm_h[1] == 0xffff) {
1858 movnw(dst, imm_h[0] ^ 0xffff, 0);
1859 } else {
1860 // use a MOVZ and MOVK (makes it easier to debug)
1861 movzw(dst, imm_h[0], 0);
1862 movkw(dst, imm_h[1], 16);
1863 }
1864 }
1865 }
1866
1867 // Form an address from base + offset in Rd. Rd may or may
1868 // not actually be used: you must use the Address that is returned.
1869 // It is up to you to ensure that the shift provided matches the size
1870 // of your data.
1871 Address MacroAssembler::form_address(Register Rd, Register base, int64_t byte_offset, int shift) {
1872 if (Address::offset_ok_for_immed(byte_offset, shift))
1873 // It fits; no need for any heroics
1874 return Address(base, byte_offset);
1875
1876 // Don't do anything clever with negative or misaligned offsets
1877 unsigned mask = (1 << shift) - 1;
1878 if (byte_offset < 0 || byte_offset & mask) {
1879 mov(Rd, byte_offset);
1880 add(Rd, base, Rd);
1881 return Address(Rd);
1882 }
1883
1884 // See if we can do this with two 12-bit offsets
1885 {
1886 uint64_t word_offset = byte_offset >> shift;
1887 uint64_t masked_offset = word_offset & 0xfff000;
1888 if (Address::offset_ok_for_immed(word_offset - masked_offset, 0)
1889 && Assembler::operand_valid_for_add_sub_immediate(masked_offset << shift)) {
1890 add(Rd, base, masked_offset << shift);
1891 word_offset -= masked_offset;
1892 return Address(Rd, word_offset << shift);
1893 }
1894 }
1895
1896 // Do it the hard way
1897 mov(Rd, byte_offset);
1898 add(Rd, base, Rd);
1899 return Address(Rd);
1900 }
1901
1902 int MacroAssembler::corrected_idivl(Register result, Register ra, Register rb,
1903 bool want_remainder, Register scratch)
1904 {
1905 // Full implementation of Java idiv and irem. The function
1906 // returns the (pc) offset of the div instruction - may be needed
1907 // for implicit exceptions.
1908 //
1909 // constraint : ra/rb =/= scratch
1910 // normal case
1911 //
1912 // input : ra: dividend
1913 // rb: divisor
1914 //
1915 // result: either
1916 // quotient (= ra idiv rb)
1917 // remainder (= ra irem rb)
1918
1919 assert(ra != scratch && rb != scratch, "reg cannot be scratch");
1920
1921 int idivl_offset = offset();
1922 if (! want_remainder) {
1923 sdivw(result, ra, rb);
1924 } else {
1925 sdivw(scratch, ra, rb);
1926 Assembler::msubw(result, scratch, rb, ra);
1927 }
1928
1929 return idivl_offset;
1930 }
1931
1932 int MacroAssembler::corrected_idivq(Register result, Register ra, Register rb,
1933 bool want_remainder, Register scratch)
1934 {
1935 // Full implementation of Java ldiv and lrem. The function
1936 // returns the (pc) offset of the div instruction - may be needed
1937 // for implicit exceptions.
1938 //
1939 // constraint : ra/rb =/= scratch
1940 // normal case
1941 //
1942 // input : ra: dividend
1943 // rb: divisor
1944 //
1945 // result: either
1946 // quotient (= ra idiv rb)
1947 // remainder (= ra irem rb)
1948
1949 assert(ra != scratch && rb != scratch, "reg cannot be scratch");
1950
1951 int idivq_offset = offset();
1952 if (! want_remainder) {
1953 sdiv(result, ra, rb);
1954 } else {
1955 sdiv(scratch, ra, rb);
1956 Assembler::msub(result, scratch, rb, ra);
1957 }
1958
1959 return idivq_offset;
1960 }
1961
1962 void MacroAssembler::membar(Membar_mask_bits order_constraint) {
1963 address prev = pc() - NativeMembar::instruction_size;
1964 address last = code()->last_insn();
1965 if (last != nullptr && nativeInstruction_at(last)->is_Membar() && prev == last) {
1966 NativeMembar *bar = NativeMembar_at(prev);
1967 // We are merging two memory barrier instructions. On AArch64 we
1968 // can do this simply by ORing them together.
1969 bar->set_kind(bar->get_kind() | order_constraint);
1970 BLOCK_COMMENT("merged membar");
1971 } else {
1972 code()->set_last_insn(pc());
1973 dmb(Assembler::barrier(order_constraint));
1974 }
1975 }
1976
1977 bool MacroAssembler::try_merge_ldst(Register rt, const Address &adr, size_t size_in_bytes, bool is_store) {
1978 if (ldst_can_merge(rt, adr, size_in_bytes, is_store)) {
1979 merge_ldst(rt, adr, size_in_bytes, is_store);
1980 code()->clear_last_insn();
1981 return true;
1982 } else {
1983 assert(size_in_bytes == 8 || size_in_bytes == 4, "only 8 bytes or 4 bytes load/store is supported.");
1984 const uint64_t mask = size_in_bytes - 1;
1985 if (adr.getMode() == Address::base_plus_offset &&
1986 (adr.offset() & mask) == 0) { // only supports base_plus_offset.
1987 code()->set_last_insn(pc());
1988 }
1989 return false;
1990 }
1991 }
1992
1993 void MacroAssembler::ldr(Register Rx, const Address &adr) {
1994 // We always try to merge two adjacent loads into one ldp.
1995 if (!try_merge_ldst(Rx, adr, 8, false)) {
1996 Assembler::ldr(Rx, adr);
1997 }
1998 }
1999
2000 void MacroAssembler::ldrw(Register Rw, const Address &adr) {
2001 // We always try to merge two adjacent loads into one ldp.
2002 if (!try_merge_ldst(Rw, adr, 4, false)) {
2003 Assembler::ldrw(Rw, adr);
2004 }
2005 }
2006
2007 void MacroAssembler::str(Register Rx, const Address &adr) {
2008 // We always try to merge two adjacent stores into one stp.
2009 if (!try_merge_ldst(Rx, adr, 8, true)) {
2010 Assembler::str(Rx, adr);
2011 }
2012 }
2013
2014 void MacroAssembler::strw(Register Rw, const Address &adr) {
2015 // We always try to merge two adjacent stores into one stp.
2016 if (!try_merge_ldst(Rw, adr, 4, true)) {
2017 Assembler::strw(Rw, adr);
2018 }
2019 }
2020
2021 // MacroAssembler routines found actually to be needed
2022
2023 void MacroAssembler::push(Register src)
2024 {
2025 str(src, Address(pre(esp, -1 * wordSize)));
2026 }
2027
2028 void MacroAssembler::pop(Register dst)
2029 {
2030 ldr(dst, Address(post(esp, 1 * wordSize)));
2031 }
2032
2033 // Note: load_unsigned_short used to be called load_unsigned_word.
2034 int MacroAssembler::load_unsigned_short(Register dst, Address src) {
2035 int off = offset();
2036 ldrh(dst, src);
2037 return off;
2038 }
2039
2040 int MacroAssembler::load_unsigned_byte(Register dst, Address src) {
2041 int off = offset();
2042 ldrb(dst, src);
2043 return off;
2044 }
2045
2046 int MacroAssembler::load_signed_short(Register dst, Address src) {
2047 int off = offset();
2048 ldrsh(dst, src);
2049 return off;
2050 }
2051
2052 int MacroAssembler::load_signed_byte(Register dst, Address src) {
2053 int off = offset();
2054 ldrsb(dst, src);
2055 return off;
2056 }
2057
2058 int MacroAssembler::load_signed_short32(Register dst, Address src) {
2059 int off = offset();
2060 ldrshw(dst, src);
2061 return off;
2062 }
2063
2064 int MacroAssembler::load_signed_byte32(Register dst, Address src) {
2065 int off = offset();
2066 ldrsbw(dst, src);
2067 return off;
2068 }
2069
2070 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed) {
2071 switch (size_in_bytes) {
2072 case 8: ldr(dst, src); break;
2073 case 4: ldrw(dst, src); break;
2074 case 2: is_signed ? load_signed_short(dst, src) : load_unsigned_short(dst, src); break;
2075 case 1: is_signed ? load_signed_byte( dst, src) : load_unsigned_byte( dst, src); break;
2076 default: ShouldNotReachHere();
2077 }
2078 }
2079
2080 void MacroAssembler::store_sized_value(Address dst, Register src, size_t size_in_bytes) {
2081 switch (size_in_bytes) {
2082 case 8: str(src, dst); break;
2083 case 4: strw(src, dst); break;
2084 case 2: strh(src, dst); break;
2085 case 1: strb(src, dst); break;
2086 default: ShouldNotReachHere();
2087 }
2088 }
2089
2090 void MacroAssembler::decrementw(Register reg, int value)
2091 {
2092 if (value < 0) { incrementw(reg, -value); return; }
2093 if (value == 0) { return; }
2094 if (value < (1 << 12)) { subw(reg, reg, value); return; }
2095 /* else */ {
2096 guarantee(reg != rscratch2, "invalid dst for register decrement");
2097 movw(rscratch2, (unsigned)value);
2098 subw(reg, reg, rscratch2);
2099 }
2100 }
2101
2102 void MacroAssembler::decrement(Register reg, int value)
2103 {
2104 if (value < 0) { increment(reg, -value); return; }
2105 if (value == 0) { return; }
2106 if (value < (1 << 12)) { sub(reg, reg, value); return; }
2107 /* else */ {
2108 assert(reg != rscratch2, "invalid dst for register decrement");
2109 mov(rscratch2, (uint64_t)value);
2110 sub(reg, reg, rscratch2);
2111 }
2112 }
2113
2114 void MacroAssembler::decrementw(Address dst, int value)
2115 {
2116 assert(!dst.uses(rscratch1), "invalid dst for address decrement");
2117 if (dst.getMode() == Address::literal) {
2118 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2119 lea(rscratch2, dst);
2120 dst = Address(rscratch2);
2121 }
2122 ldrw(rscratch1, dst);
2123 decrementw(rscratch1, value);
2124 strw(rscratch1, dst);
2125 }
2126
2127 void MacroAssembler::decrement(Address dst, int value)
2128 {
2129 assert(!dst.uses(rscratch1), "invalid address for decrement");
2130 if (dst.getMode() == Address::literal) {
2131 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2132 lea(rscratch2, dst);
2133 dst = Address(rscratch2);
2134 }
2135 ldr(rscratch1, dst);
2136 decrement(rscratch1, value);
2137 str(rscratch1, dst);
2138 }
2139
2140 void MacroAssembler::incrementw(Register reg, int value)
2141 {
2142 if (value < 0) { decrementw(reg, -value); return; }
2143 if (value == 0) { return; }
2144 if (value < (1 << 12)) { addw(reg, reg, value); return; }
2145 /* else */ {
2146 assert(reg != rscratch2, "invalid dst for register increment");
2147 movw(rscratch2, (unsigned)value);
2148 addw(reg, reg, rscratch2);
2149 }
2150 }
2151
2152 void MacroAssembler::increment(Register reg, int value)
2153 {
2154 if (value < 0) { decrement(reg, -value); return; }
2155 if (value == 0) { return; }
2156 if (value < (1 << 12)) { add(reg, reg, value); return; }
2157 /* else */ {
2158 assert(reg != rscratch2, "invalid dst for register increment");
2159 movw(rscratch2, (unsigned)value);
2160 add(reg, reg, rscratch2);
2161 }
2162 }
2163
2164 void MacroAssembler::incrementw(Address dst, int value)
2165 {
2166 assert(!dst.uses(rscratch1), "invalid dst for address increment");
2167 if (dst.getMode() == Address::literal) {
2168 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2169 lea(rscratch2, dst);
2170 dst = Address(rscratch2);
2171 }
2172 ldrw(rscratch1, dst);
2173 incrementw(rscratch1, value);
2174 strw(rscratch1, dst);
2175 }
2176
2177 void MacroAssembler::increment(Address dst, int value)
2178 {
2179 assert(!dst.uses(rscratch1), "invalid dst for address increment");
2180 if (dst.getMode() == Address::literal) {
2181 assert(abs(value) < (1 << 12), "invalid value and address mode combination");
2182 lea(rscratch2, dst);
2183 dst = Address(rscratch2);
2184 }
2185 ldr(rscratch1, dst);
2186 increment(rscratch1, value);
2187 str(rscratch1, dst);
2188 }
2189
2190 // Push lots of registers in the bit set supplied. Don't push sp.
2191 // Return the number of words pushed
2192 int MacroAssembler::push(unsigned int bitset, Register stack) {
2193 int words_pushed = 0;
2194
2195 // Scan bitset to accumulate register pairs
2196 unsigned char regs[32];
2197 int count = 0;
2198 for (int reg = 0; reg <= 30; reg++) {
2199 if (1 & bitset)
2200 regs[count++] = reg;
2201 bitset >>= 1;
2202 }
2203 regs[count++] = zr->raw_encoding();
2204 count &= ~1; // Only push an even number of regs
2205
2206 if (count) {
2207 stp(as_Register(regs[0]), as_Register(regs[1]),
2208 Address(pre(stack, -count * wordSize)));
2209 words_pushed += 2;
2210 }
2211 for (int i = 2; i < count; i += 2) {
2212 stp(as_Register(regs[i]), as_Register(regs[i+1]),
2213 Address(stack, i * wordSize));
2214 words_pushed += 2;
2215 }
2216
2217 assert(words_pushed == count, "oops, pushed != count");
2218
2219 return count;
2220 }
2221
2222 int MacroAssembler::pop(unsigned int bitset, Register stack) {
2223 int words_pushed = 0;
2224
2225 // Scan bitset to accumulate register pairs
2226 unsigned char regs[32];
2227 int count = 0;
2228 for (int reg = 0; reg <= 30; reg++) {
2229 if (1 & bitset)
2230 regs[count++] = reg;
2231 bitset >>= 1;
2232 }
2233 regs[count++] = zr->raw_encoding();
2234 count &= ~1;
2235
2236 for (int i = 2; i < count; i += 2) {
2237 ldp(as_Register(regs[i]), as_Register(regs[i+1]),
2238 Address(stack, i * wordSize));
2239 words_pushed += 2;
2240 }
2241 if (count) {
2242 ldp(as_Register(regs[0]), as_Register(regs[1]),
2243 Address(post(stack, count * wordSize)));
2244 words_pushed += 2;
2245 }
2246
2247 assert(words_pushed == count, "oops, pushed != count");
2248
2249 return count;
2250 }
2251
2252 // Push lots of registers in the bit set supplied. Don't push sp.
2253 // Return the number of dwords pushed
2254 int MacroAssembler::push_fp(unsigned int bitset, Register stack) {
2255 int words_pushed = 0;
2256 bool use_sve = false;
2257 int sve_vector_size_in_bytes = 0;
2258
2259 #ifdef COMPILER2
2260 use_sve = Matcher::supports_scalable_vector();
2261 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
2262 #endif
2263
2264 // Scan bitset to accumulate register pairs
2265 unsigned char regs[32];
2266 int count = 0;
2267 for (int reg = 0; reg <= 31; reg++) {
2268 if (1 & bitset)
2269 regs[count++] = reg;
2270 bitset >>= 1;
2271 }
2272
2273 if (count == 0) {
2274 return 0;
2275 }
2276
2277 // SVE
2278 if (use_sve && sve_vector_size_in_bytes > 16) {
2279 sub(stack, stack, sve_vector_size_in_bytes * count);
2280 for (int i = 0; i < count; i++) {
2281 sve_str(as_FloatRegister(regs[i]), Address(stack, i));
2282 }
2283 return count * sve_vector_size_in_bytes / 8;
2284 }
2285
2286 // NEON
2287 if (count == 1) {
2288 strq(as_FloatRegister(regs[0]), Address(pre(stack, -wordSize * 2)));
2289 return 2;
2290 }
2291
2292 bool odd = (count & 1) == 1;
2293 int push_slots = count + (odd ? 1 : 0);
2294
2295 // Always pushing full 128 bit registers.
2296 stpq(as_FloatRegister(regs[0]), as_FloatRegister(regs[1]), Address(pre(stack, -push_slots * wordSize * 2)));
2297 words_pushed += 2;
2298
2299 for (int i = 2; i + 1 < count; i += 2) {
2300 stpq(as_FloatRegister(regs[i]), as_FloatRegister(regs[i+1]), Address(stack, i * wordSize * 2));
2301 words_pushed += 2;
2302 }
2303
2304 if (odd) {
2305 strq(as_FloatRegister(regs[count - 1]), Address(stack, (count - 1) * wordSize * 2));
2306 words_pushed++;
2307 }
2308
2309 assert(words_pushed == count, "oops, pushed(%d) != count(%d)", words_pushed, count);
2310 return count * 2;
2311 }
2312
2313 // Return the number of dwords popped
2314 int MacroAssembler::pop_fp(unsigned int bitset, Register stack) {
2315 int words_pushed = 0;
2316 bool use_sve = false;
2317 int sve_vector_size_in_bytes = 0;
2318
2319 #ifdef COMPILER2
2320 use_sve = Matcher::supports_scalable_vector();
2321 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
2322 #endif
2323 // Scan bitset to accumulate register pairs
2324 unsigned char regs[32];
2325 int count = 0;
2326 for (int reg = 0; reg <= 31; reg++) {
2327 if (1 & bitset)
2328 regs[count++] = reg;
2329 bitset >>= 1;
2330 }
2331
2332 if (count == 0) {
2333 return 0;
2334 }
2335
2336 // SVE
2337 if (use_sve && sve_vector_size_in_bytes > 16) {
2338 for (int i = count - 1; i >= 0; i--) {
2339 sve_ldr(as_FloatRegister(regs[i]), Address(stack, i));
2340 }
2341 add(stack, stack, sve_vector_size_in_bytes * count);
2342 return count * sve_vector_size_in_bytes / 8;
2343 }
2344
2345 // NEON
2346 if (count == 1) {
2347 ldrq(as_FloatRegister(regs[0]), Address(post(stack, wordSize * 2)));
2348 return 2;
2349 }
2350
2351 bool odd = (count & 1) == 1;
2352 int push_slots = count + (odd ? 1 : 0);
2353
2354 if (odd) {
2355 ldrq(as_FloatRegister(regs[count - 1]), Address(stack, (count - 1) * wordSize * 2));
2356 words_pushed++;
2357 }
2358
2359 for (int i = 2; i + 1 < count; i += 2) {
2360 ldpq(as_FloatRegister(regs[i]), as_FloatRegister(regs[i+1]), Address(stack, i * wordSize * 2));
2361 words_pushed += 2;
2362 }
2363
2364 ldpq(as_FloatRegister(regs[0]), as_FloatRegister(regs[1]), Address(post(stack, push_slots * wordSize * 2)));
2365 words_pushed += 2;
2366
2367 assert(words_pushed == count, "oops, pushed(%d) != count(%d)", words_pushed, count);
2368
2369 return count * 2;
2370 }
2371
2372 // Return the number of dwords pushed
2373 int MacroAssembler::push_p(unsigned int bitset, Register stack) {
2374 bool use_sve = false;
2375 int sve_predicate_size_in_slots = 0;
2376
2377 #ifdef COMPILER2
2378 use_sve = Matcher::supports_scalable_vector();
2379 if (use_sve) {
2380 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
2381 }
2382 #endif
2383
2384 if (!use_sve) {
2385 return 0;
2386 }
2387
2388 unsigned char regs[PRegister::number_of_registers];
2389 int count = 0;
2390 for (int reg = 0; reg < PRegister::number_of_registers; reg++) {
2391 if (1 & bitset)
2392 regs[count++] = reg;
2393 bitset >>= 1;
2394 }
2395
2396 if (count == 0) {
2397 return 0;
2398 }
2399
2400 int total_push_bytes = align_up(sve_predicate_size_in_slots *
2401 VMRegImpl::stack_slot_size * count, 16);
2402 sub(stack, stack, total_push_bytes);
2403 for (int i = 0; i < count; i++) {
2404 sve_str(as_PRegister(regs[i]), Address(stack, i));
2405 }
2406 return total_push_bytes / 8;
2407 }
2408
2409 // Return the number of dwords popped
2410 int MacroAssembler::pop_p(unsigned int bitset, Register stack) {
2411 bool use_sve = false;
2412 int sve_predicate_size_in_slots = 0;
2413
2414 #ifdef COMPILER2
2415 use_sve = Matcher::supports_scalable_vector();
2416 if (use_sve) {
2417 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
2418 }
2419 #endif
2420
2421 if (!use_sve) {
2422 return 0;
2423 }
2424
2425 unsigned char regs[PRegister::number_of_registers];
2426 int count = 0;
2427 for (int reg = 0; reg < PRegister::number_of_registers; reg++) {
2428 if (1 & bitset)
2429 regs[count++] = reg;
2430 bitset >>= 1;
2431 }
2432
2433 if (count == 0) {
2434 return 0;
2435 }
2436
2437 int total_pop_bytes = align_up(sve_predicate_size_in_slots *
2438 VMRegImpl::stack_slot_size * count, 16);
2439 for (int i = count - 1; i >= 0; i--) {
2440 sve_ldr(as_PRegister(regs[i]), Address(stack, i));
2441 }
2442 add(stack, stack, total_pop_bytes);
2443 return total_pop_bytes / 8;
2444 }
2445
2446 #ifdef ASSERT
2447 void MacroAssembler::verify_heapbase(const char* msg) {
2448 #if 0
2449 assert (UseCompressedOops || UseCompressedClassPointers, "should be compressed");
2450 assert (Universe::heap() != nullptr, "java heap should be initialized");
2451 if (!UseCompressedOops || Universe::ptr_base() == nullptr) {
2452 // rheapbase is allocated as general register
2453 return;
2454 }
2455 if (CheckCompressedOops) {
2456 Label ok;
2457 push(1 << rscratch1->encoding(), sp); // cmpptr trashes rscratch1
2458 cmpptr(rheapbase, ExternalAddress(CompressedOops::ptrs_base_addr()));
2459 br(Assembler::EQ, ok);
2460 stop(msg);
2461 bind(ok);
2462 pop(1 << rscratch1->encoding(), sp);
2463 }
2464 #endif
2465 }
2466 #endif
2467
2468 void MacroAssembler::resolve_jobject(Register value, Register tmp1, Register tmp2) {
2469 assert_different_registers(value, tmp1, tmp2);
2470 Label done, tagged, weak_tagged;
2471
2472 cbz(value, done); // Use null as-is.
2473 tst(value, JNIHandles::tag_mask); // Test for tag.
2474 br(Assembler::NE, tagged);
2475
2476 // Resolve local handle
2477 access_load_at(T_OBJECT, IN_NATIVE | AS_RAW, value, Address(value, 0), tmp1, tmp2);
2478 verify_oop(value);
2479 b(done);
2480
2481 bind(tagged);
2482 STATIC_ASSERT(JNIHandles::TypeTag::weak_global == 0b1);
2483 tbnz(value, 0, weak_tagged); // Test for weak tag.
2484
2485 // Resolve global handle
2486 access_load_at(T_OBJECT, IN_NATIVE, value, Address(value, -JNIHandles::TypeTag::global), tmp1, tmp2);
2487 verify_oop(value);
2488 b(done);
2489
2490 bind(weak_tagged);
2491 // Resolve jweak.
2492 access_load_at(T_OBJECT, IN_NATIVE | ON_PHANTOM_OOP_REF,
2493 value, Address(value, -JNIHandles::TypeTag::weak_global), tmp1, tmp2);
2494 verify_oop(value);
2495
2496 bind(done);
2497 }
2498
2499 void MacroAssembler::resolve_global_jobject(Register value, Register tmp1, Register tmp2) {
2500 assert_different_registers(value, tmp1, tmp2);
2501 Label done;
2502
2503 cbz(value, done); // Use null as-is.
2504
2505 #ifdef ASSERT
2506 {
2507 STATIC_ASSERT(JNIHandles::TypeTag::global == 0b10);
2508 Label valid_global_tag;
2509 tbnz(value, 1, valid_global_tag); // Test for global tag
2510 stop("non global jobject using resolve_global_jobject");
2511 bind(valid_global_tag);
2512 }
2513 #endif
2514
2515 // Resolve global handle
2516 access_load_at(T_OBJECT, IN_NATIVE, value, Address(value, -JNIHandles::TypeTag::global), tmp1, tmp2);
2517 verify_oop(value);
2518
2519 bind(done);
2520 }
2521
2522 void MacroAssembler::stop(const char* msg) {
2523 BLOCK_COMMENT(msg);
2524 dcps1(0xdeae);
2525 emit_int64((uintptr_t)msg);
2526 }
2527
2528 void MacroAssembler::unimplemented(const char* what) {
2529 const char* buf = nullptr;
2530 {
2531 ResourceMark rm;
2532 stringStream ss;
2533 ss.print("unimplemented: %s", what);
2534 buf = code_string(ss.as_string());
2535 }
2536 stop(buf);
2537 }
2538
2539 void MacroAssembler::_assert_asm(Assembler::Condition cc, const char* msg) {
2540 #ifdef ASSERT
2541 Label OK;
2542 br(cc, OK);
2543 stop(msg);
2544 bind(OK);
2545 #endif
2546 }
2547
2548 // If a constant does not fit in an immediate field, generate some
2549 // number of MOV instructions and then perform the operation.
2550 void MacroAssembler::wrap_add_sub_imm_insn(Register Rd, Register Rn, uint64_t imm,
2551 add_sub_imm_insn insn1,
2552 add_sub_reg_insn insn2,
2553 bool is32) {
2554 assert(Rd != zr, "Rd = zr and not setting flags?");
2555 bool fits = operand_valid_for_add_sub_immediate(is32 ? (int32_t)imm : imm);
2556 if (fits) {
2557 (this->*insn1)(Rd, Rn, imm);
2558 } else {
2559 if (uabs(imm) < (1 << 24)) {
2560 (this->*insn1)(Rd, Rn, imm & -(1 << 12));
2561 (this->*insn1)(Rd, Rd, imm & ((1 << 12)-1));
2562 } else {
2563 assert_different_registers(Rd, Rn);
2564 mov(Rd, imm);
2565 (this->*insn2)(Rd, Rn, Rd, LSL, 0);
2566 }
2567 }
2568 }
2569
2570 // Separate vsn which sets the flags. Optimisations are more restricted
2571 // because we must set the flags correctly.
2572 void MacroAssembler::wrap_adds_subs_imm_insn(Register Rd, Register Rn, uint64_t imm,
2573 add_sub_imm_insn insn1,
2574 add_sub_reg_insn insn2,
2575 bool is32) {
2576 bool fits = operand_valid_for_add_sub_immediate(is32 ? (int32_t)imm : imm);
2577 if (fits) {
2578 (this->*insn1)(Rd, Rn, imm);
2579 } else {
2580 assert_different_registers(Rd, Rn);
2581 assert(Rd != zr, "overflow in immediate operand");
2582 mov(Rd, imm);
2583 (this->*insn2)(Rd, Rn, Rd, LSL, 0);
2584 }
2585 }
2586
2587
2588 void MacroAssembler::add(Register Rd, Register Rn, RegisterOrConstant increment) {
2589 if (increment.is_register()) {
2590 add(Rd, Rn, increment.as_register());
2591 } else {
2592 add(Rd, Rn, increment.as_constant());
2593 }
2594 }
2595
2596 void MacroAssembler::addw(Register Rd, Register Rn, RegisterOrConstant increment) {
2597 if (increment.is_register()) {
2598 addw(Rd, Rn, increment.as_register());
2599 } else {
2600 addw(Rd, Rn, increment.as_constant());
2601 }
2602 }
2603
2604 void MacroAssembler::sub(Register Rd, Register Rn, RegisterOrConstant decrement) {
2605 if (decrement.is_register()) {
2606 sub(Rd, Rn, decrement.as_register());
2607 } else {
2608 sub(Rd, Rn, decrement.as_constant());
2609 }
2610 }
2611
2612 void MacroAssembler::subw(Register Rd, Register Rn, RegisterOrConstant decrement) {
2613 if (decrement.is_register()) {
2614 subw(Rd, Rn, decrement.as_register());
2615 } else {
2616 subw(Rd, Rn, decrement.as_constant());
2617 }
2618 }
2619
2620 void MacroAssembler::reinit_heapbase()
2621 {
2622 if (UseCompressedOops) {
2623 if (Universe::is_fully_initialized()) {
2624 mov(rheapbase, CompressedOops::ptrs_base());
2625 } else {
2626 lea(rheapbase, ExternalAddress(CompressedOops::ptrs_base_addr()));
2627 ldr(rheapbase, Address(rheapbase));
2628 }
2629 }
2630 }
2631
2632 // this simulates the behaviour of the x86 cmpxchg instruction using a
2633 // load linked/store conditional pair. we use the acquire/release
2634 // versions of these instructions so that we flush pending writes as
2635 // per Java semantics.
2636
2637 // n.b the x86 version assumes the old value to be compared against is
2638 // in rax and updates rax with the value located in memory if the
2639 // cmpxchg fails. we supply a register for the old value explicitly
2640
2641 // the aarch64 load linked/store conditional instructions do not
2642 // accept an offset. so, unlike x86, we must provide a plain register
2643 // to identify the memory word to be compared/exchanged rather than a
2644 // register+offset Address.
2645
2646 void MacroAssembler::cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp,
2647 Label &succeed, Label *fail) {
2648 // oldv holds comparison value
2649 // newv holds value to write in exchange
2650 // addr identifies memory word to compare against/update
2651 if (UseLSE) {
2652 mov(tmp, oldv);
2653 casal(Assembler::xword, oldv, newv, addr);
2654 cmp(tmp, oldv);
2655 br(Assembler::EQ, succeed);
2656 membar(AnyAny);
2657 } else {
2658 Label retry_load, nope;
2659 prfm(Address(addr), PSTL1STRM);
2660 bind(retry_load);
2661 // flush and load exclusive from the memory location
2662 // and fail if it is not what we expect
2663 ldaxr(tmp, addr);
2664 cmp(tmp, oldv);
2665 br(Assembler::NE, nope);
2666 // if we store+flush with no intervening write tmp will be zero
2667 stlxr(tmp, newv, addr);
2668 cbzw(tmp, succeed);
2669 // retry so we only ever return after a load fails to compare
2670 // ensures we don't return a stale value after a failed write.
2671 b(retry_load);
2672 // if the memory word differs we return it in oldv and signal a fail
2673 bind(nope);
2674 membar(AnyAny);
2675 mov(oldv, tmp);
2676 }
2677 if (fail)
2678 b(*fail);
2679 }
2680
2681 void MacroAssembler::cmpxchg_obj_header(Register oldv, Register newv, Register obj, Register tmp,
2682 Label &succeed, Label *fail) {
2683 assert(oopDesc::mark_offset_in_bytes() == 0, "assumption");
2684 cmpxchgptr(oldv, newv, obj, tmp, succeed, fail);
2685 }
2686
2687 void MacroAssembler::cmpxchgw(Register oldv, Register newv, Register addr, Register tmp,
2688 Label &succeed, Label *fail) {
2689 // oldv holds comparison value
2690 // newv holds value to write in exchange
2691 // addr identifies memory word to compare against/update
2692 // tmp returns 0/1 for success/failure
2693 if (UseLSE) {
2694 mov(tmp, oldv);
2695 casal(Assembler::word, oldv, newv, addr);
2696 cmp(tmp, oldv);
2697 br(Assembler::EQ, succeed);
2698 membar(AnyAny);
2699 } else {
2700 Label retry_load, nope;
2701 prfm(Address(addr), PSTL1STRM);
2702 bind(retry_load);
2703 // flush and load exclusive from the memory location
2704 // and fail if it is not what we expect
2705 ldaxrw(tmp, addr);
2706 cmp(tmp, oldv);
2707 br(Assembler::NE, nope);
2708 // if we store+flush with no intervening write tmp will be zero
2709 stlxrw(tmp, newv, addr);
2710 cbzw(tmp, succeed);
2711 // retry so we only ever return after a load fails to compare
2712 // ensures we don't return a stale value after a failed write.
2713 b(retry_load);
2714 // if the memory word differs we return it in oldv and signal a fail
2715 bind(nope);
2716 membar(AnyAny);
2717 mov(oldv, tmp);
2718 }
2719 if (fail)
2720 b(*fail);
2721 }
2722
2723 // A generic CAS; success or failure is in the EQ flag. A weak CAS
2724 // doesn't retry and may fail spuriously. If the oldval is wanted,
2725 // Pass a register for the result, otherwise pass noreg.
2726
2727 // Clobbers rscratch1
2728 void MacroAssembler::cmpxchg(Register addr, Register expected,
2729 Register new_val,
2730 enum operand_size size,
2731 bool acquire, bool release,
2732 bool weak,
2733 Register result) {
2734 if (result == noreg) result = rscratch1;
2735 BLOCK_COMMENT("cmpxchg {");
2736 if (UseLSE) {
2737 mov(result, expected);
2738 lse_cas(result, new_val, addr, size, acquire, release, /*not_pair*/ true);
2739 compare_eq(result, expected, size);
2740 } else {
2741 Label retry_load, done;
2742 prfm(Address(addr), PSTL1STRM);
2743 bind(retry_load);
2744 load_exclusive(result, addr, size, acquire);
2745 compare_eq(result, expected, size);
2746 br(Assembler::NE, done);
2747 store_exclusive(rscratch1, new_val, addr, size, release);
2748 if (weak) {
2749 cmpw(rscratch1, 0u); // If the store fails, return NE to our caller.
2750 } else {
2751 cbnzw(rscratch1, retry_load);
2752 }
2753 bind(done);
2754 }
2755 BLOCK_COMMENT("} cmpxchg");
2756 }
2757
2758 // A generic comparison. Only compares for equality, clobbers rscratch1.
2759 void MacroAssembler::compare_eq(Register rm, Register rn, enum operand_size size) {
2760 if (size == xword) {
2761 cmp(rm, rn);
2762 } else if (size == word) {
2763 cmpw(rm, rn);
2764 } else if (size == halfword) {
2765 eorw(rscratch1, rm, rn);
2766 ands(zr, rscratch1, 0xffff);
2767 } else if (size == byte) {
2768 eorw(rscratch1, rm, rn);
2769 ands(zr, rscratch1, 0xff);
2770 } else {
2771 ShouldNotReachHere();
2772 }
2773 }
2774
2775
2776 static bool different(Register a, RegisterOrConstant b, Register c) {
2777 if (b.is_constant())
2778 return a != c;
2779 else
2780 return a != b.as_register() && a != c && b.as_register() != c;
2781 }
2782
2783 #define ATOMIC_OP(NAME, LDXR, OP, IOP, AOP, STXR, sz) \
2784 void MacroAssembler::atomic_##NAME(Register prev, RegisterOrConstant incr, Register addr) { \
2785 if (UseLSE) { \
2786 prev = prev->is_valid() ? prev : zr; \
2787 if (incr.is_register()) { \
2788 AOP(sz, incr.as_register(), prev, addr); \
2789 } else { \
2790 mov(rscratch2, incr.as_constant()); \
2791 AOP(sz, rscratch2, prev, addr); \
2792 } \
2793 return; \
2794 } \
2795 Register result = rscratch2; \
2796 if (prev->is_valid()) \
2797 result = different(prev, incr, addr) ? prev : rscratch2; \
2798 \
2799 Label retry_load; \
2800 prfm(Address(addr), PSTL1STRM); \
2801 bind(retry_load); \
2802 LDXR(result, addr); \
2803 OP(rscratch1, result, incr); \
2804 STXR(rscratch2, rscratch1, addr); \
2805 cbnzw(rscratch2, retry_load); \
2806 if (prev->is_valid() && prev != result) { \
2807 IOP(prev, rscratch1, incr); \
2808 } \
2809 }
2810
2811 ATOMIC_OP(add, ldxr, add, sub, ldadd, stxr, Assembler::xword)
2812 ATOMIC_OP(addw, ldxrw, addw, subw, ldadd, stxrw, Assembler::word)
2813 ATOMIC_OP(addal, ldaxr, add, sub, ldaddal, stlxr, Assembler::xword)
2814 ATOMIC_OP(addalw, ldaxrw, addw, subw, ldaddal, stlxrw, Assembler::word)
2815
2816 #undef ATOMIC_OP
2817
2818 #define ATOMIC_XCHG(OP, AOP, LDXR, STXR, sz) \
2819 void MacroAssembler::atomic_##OP(Register prev, Register newv, Register addr) { \
2820 if (UseLSE) { \
2821 prev = prev->is_valid() ? prev : zr; \
2822 AOP(sz, newv, prev, addr); \
2823 return; \
2824 } \
2825 Register result = rscratch2; \
2826 if (prev->is_valid()) \
2827 result = different(prev, newv, addr) ? prev : rscratch2; \
2828 \
2829 Label retry_load; \
2830 prfm(Address(addr), PSTL1STRM); \
2831 bind(retry_load); \
2832 LDXR(result, addr); \
2833 STXR(rscratch1, newv, addr); \
2834 cbnzw(rscratch1, retry_load); \
2835 if (prev->is_valid() && prev != result) \
2836 mov(prev, result); \
2837 }
2838
2839 ATOMIC_XCHG(xchg, swp, ldxr, stxr, Assembler::xword)
2840 ATOMIC_XCHG(xchgw, swp, ldxrw, stxrw, Assembler::word)
2841 ATOMIC_XCHG(xchgl, swpl, ldxr, stlxr, Assembler::xword)
2842 ATOMIC_XCHG(xchglw, swpl, ldxrw, stlxrw, Assembler::word)
2843 ATOMIC_XCHG(xchgal, swpal, ldaxr, stlxr, Assembler::xword)
2844 ATOMIC_XCHG(xchgalw, swpal, ldaxrw, stlxrw, Assembler::word)
2845
2846 #undef ATOMIC_XCHG
2847
2848 #ifndef PRODUCT
2849 extern "C" void findpc(intptr_t x);
2850 #endif
2851
2852 void MacroAssembler::debug64(char* msg, int64_t pc, int64_t regs[])
2853 {
2854 // In order to get locks to work, we need to fake a in_VM state
2855 if (ShowMessageBoxOnError ) {
2856 JavaThread* thread = JavaThread::current();
2857 JavaThreadState saved_state = thread->thread_state();
2858 thread->set_thread_state(_thread_in_vm);
2859 #ifndef PRODUCT
2860 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
2861 ttyLocker ttyl;
2862 BytecodeCounter::print();
2863 }
2864 #endif
2865 if (os::message_box(msg, "Execution stopped, print registers?")) {
2866 ttyLocker ttyl;
2867 tty->print_cr(" pc = 0x%016" PRIx64, pc);
2868 #ifndef PRODUCT
2869 tty->cr();
2870 findpc(pc);
2871 tty->cr();
2872 #endif
2873 tty->print_cr(" r0 = 0x%016" PRIx64, regs[0]);
2874 tty->print_cr(" r1 = 0x%016" PRIx64, regs[1]);
2875 tty->print_cr(" r2 = 0x%016" PRIx64, regs[2]);
2876 tty->print_cr(" r3 = 0x%016" PRIx64, regs[3]);
2877 tty->print_cr(" r4 = 0x%016" PRIx64, regs[4]);
2878 tty->print_cr(" r5 = 0x%016" PRIx64, regs[5]);
2879 tty->print_cr(" r6 = 0x%016" PRIx64, regs[6]);
2880 tty->print_cr(" r7 = 0x%016" PRIx64, regs[7]);
2881 tty->print_cr(" r8 = 0x%016" PRIx64, regs[8]);
2882 tty->print_cr(" r9 = 0x%016" PRIx64, regs[9]);
2883 tty->print_cr("r10 = 0x%016" PRIx64, regs[10]);
2884 tty->print_cr("r11 = 0x%016" PRIx64, regs[11]);
2885 tty->print_cr("r12 = 0x%016" PRIx64, regs[12]);
2886 tty->print_cr("r13 = 0x%016" PRIx64, regs[13]);
2887 tty->print_cr("r14 = 0x%016" PRIx64, regs[14]);
2888 tty->print_cr("r15 = 0x%016" PRIx64, regs[15]);
2889 tty->print_cr("r16 = 0x%016" PRIx64, regs[16]);
2890 tty->print_cr("r17 = 0x%016" PRIx64, regs[17]);
2891 tty->print_cr("r18 = 0x%016" PRIx64, regs[18]);
2892 tty->print_cr("r19 = 0x%016" PRIx64, regs[19]);
2893 tty->print_cr("r20 = 0x%016" PRIx64, regs[20]);
2894 tty->print_cr("r21 = 0x%016" PRIx64, regs[21]);
2895 tty->print_cr("r22 = 0x%016" PRIx64, regs[22]);
2896 tty->print_cr("r23 = 0x%016" PRIx64, regs[23]);
2897 tty->print_cr("r24 = 0x%016" PRIx64, regs[24]);
2898 tty->print_cr("r25 = 0x%016" PRIx64, regs[25]);
2899 tty->print_cr("r26 = 0x%016" PRIx64, regs[26]);
2900 tty->print_cr("r27 = 0x%016" PRIx64, regs[27]);
2901 tty->print_cr("r28 = 0x%016" PRIx64, regs[28]);
2902 tty->print_cr("r30 = 0x%016" PRIx64, regs[30]);
2903 tty->print_cr("r31 = 0x%016" PRIx64, regs[31]);
2904 BREAKPOINT;
2905 }
2906 }
2907 fatal("DEBUG MESSAGE: %s", msg);
2908 }
2909
2910 RegSet MacroAssembler::call_clobbered_gp_registers() {
2911 RegSet regs = RegSet::range(r0, r17) - RegSet::of(rscratch1, rscratch2);
2912 #ifndef R18_RESERVED
2913 regs += r18_tls;
2914 #endif
2915 return regs;
2916 }
2917
2918 void MacroAssembler::push_call_clobbered_registers_except(RegSet exclude) {
2919 int step = 4 * wordSize;
2920 push(call_clobbered_gp_registers() - exclude, sp);
2921 sub(sp, sp, step);
2922 mov(rscratch1, -step);
2923 // Push v0-v7, v16-v31.
2924 for (int i = 31; i>= 4; i -= 4) {
2925 if (i <= v7->encoding() || i >= v16->encoding())
2926 st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
2927 as_FloatRegister(i), T1D, Address(post(sp, rscratch1)));
2928 }
2929 st1(as_FloatRegister(0), as_FloatRegister(1), as_FloatRegister(2),
2930 as_FloatRegister(3), T1D, Address(sp));
2931 }
2932
2933 void MacroAssembler::pop_call_clobbered_registers_except(RegSet exclude) {
2934 for (int i = 0; i < 32; i += 4) {
2935 if (i <= v7->encoding() || i >= v16->encoding())
2936 ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
2937 as_FloatRegister(i+3), T1D, Address(post(sp, 4 * wordSize)));
2938 }
2939
2940 reinitialize_ptrue();
2941
2942 pop(call_clobbered_gp_registers() - exclude, sp);
2943 }
2944
2945 void MacroAssembler::push_CPU_state(bool save_vectors, bool use_sve,
2946 int sve_vector_size_in_bytes, int total_predicate_in_bytes) {
2947 push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
2948 if (save_vectors && use_sve && sve_vector_size_in_bytes > 16) {
2949 sub(sp, sp, sve_vector_size_in_bytes * FloatRegister::number_of_registers);
2950 for (int i = 0; i < FloatRegister::number_of_registers; i++) {
2951 sve_str(as_FloatRegister(i), Address(sp, i));
2952 }
2953 } else {
2954 int step = (save_vectors ? 8 : 4) * wordSize;
2955 mov(rscratch1, -step);
2956 sub(sp, sp, step);
2957 for (int i = 28; i >= 4; i -= 4) {
2958 st1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
2959 as_FloatRegister(i+3), save_vectors ? T2D : T1D, Address(post(sp, rscratch1)));
2960 }
2961 st1(v0, v1, v2, v3, save_vectors ? T2D : T1D, sp);
2962 }
2963 if (save_vectors && use_sve && total_predicate_in_bytes > 0) {
2964 sub(sp, sp, total_predicate_in_bytes);
2965 for (int i = 0; i < PRegister::number_of_registers; i++) {
2966 sve_str(as_PRegister(i), Address(sp, i));
2967 }
2968 }
2969 }
2970
2971 void MacroAssembler::pop_CPU_state(bool restore_vectors, bool use_sve,
2972 int sve_vector_size_in_bytes, int total_predicate_in_bytes) {
2973 if (restore_vectors && use_sve && total_predicate_in_bytes > 0) {
2974 for (int i = PRegister::number_of_registers - 1; i >= 0; i--) {
2975 sve_ldr(as_PRegister(i), Address(sp, i));
2976 }
2977 add(sp, sp, total_predicate_in_bytes);
2978 }
2979 if (restore_vectors && use_sve && sve_vector_size_in_bytes > 16) {
2980 for (int i = FloatRegister::number_of_registers - 1; i >= 0; i--) {
2981 sve_ldr(as_FloatRegister(i), Address(sp, i));
2982 }
2983 add(sp, sp, sve_vector_size_in_bytes * FloatRegister::number_of_registers);
2984 } else {
2985 int step = (restore_vectors ? 8 : 4) * wordSize;
2986 for (int i = 0; i <= 28; i += 4)
2987 ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
2988 as_FloatRegister(i+3), restore_vectors ? T2D : T1D, Address(post(sp, step)));
2989 }
2990
2991 // We may use predicate registers and rely on ptrue with SVE,
2992 // regardless of wide vector (> 8 bytes) used or not.
2993 if (use_sve) {
2994 reinitialize_ptrue();
2995 }
2996
2997 // integer registers except lr & sp
2998 pop(RegSet::range(r0, r17), sp);
2999 #ifdef R18_RESERVED
3000 ldp(zr, r19, Address(post(sp, 2 * wordSize)));
3001 pop(RegSet::range(r20, r29), sp);
3002 #else
3003 pop(RegSet::range(r18_tls, r29), sp);
3004 #endif
3005 }
3006
3007 /**
3008 * Helpers for multiply_to_len().
3009 */
3010 void MacroAssembler::add2_with_carry(Register final_dest_hi, Register dest_hi, Register dest_lo,
3011 Register src1, Register src2) {
3012 adds(dest_lo, dest_lo, src1);
3013 adc(dest_hi, dest_hi, zr);
3014 adds(dest_lo, dest_lo, src2);
3015 adc(final_dest_hi, dest_hi, zr);
3016 }
3017
3018 // Generate an address from (r + r1 extend offset). "size" is the
3019 // size of the operand. The result may be in rscratch2.
3020 Address MacroAssembler::offsetted_address(Register r, Register r1,
3021 Address::extend ext, int offset, int size) {
3022 if (offset || (ext.shift() % size != 0)) {
3023 lea(rscratch2, Address(r, r1, ext));
3024 return Address(rscratch2, offset);
3025 } else {
3026 return Address(r, r1, ext);
3027 }
3028 }
3029
3030 Address MacroAssembler::spill_address(int size, int offset, Register tmp)
3031 {
3032 assert(offset >= 0, "spill to negative address?");
3033 // Offset reachable ?
3034 // Not aligned - 9 bits signed offset
3035 // Aligned - 12 bits unsigned offset shifted
3036 Register base = sp;
3037 if ((offset & (size-1)) && offset >= (1<<8)) {
3038 add(tmp, base, offset & ((1<<12)-1));
3039 base = tmp;
3040 offset &= -1u<<12;
3041 }
3042
3043 if (offset >= (1<<12) * size) {
3044 add(tmp, base, offset & (((1<<12)-1)<<12));
3045 base = tmp;
3046 offset &= ~(((1<<12)-1)<<12);
3047 }
3048
3049 return Address(base, offset);
3050 }
3051
3052 Address MacroAssembler::sve_spill_address(int sve_reg_size_in_bytes, int offset, Register tmp) {
3053 assert(offset >= 0, "spill to negative address?");
3054
3055 Register base = sp;
3056
3057 // An immediate offset in the range 0 to 255 which is multiplied
3058 // by the current vector or predicate register size in bytes.
3059 if (offset % sve_reg_size_in_bytes == 0 && offset < ((1<<8)*sve_reg_size_in_bytes)) {
3060 return Address(base, offset / sve_reg_size_in_bytes);
3061 }
3062
3063 add(tmp, base, offset);
3064 return Address(tmp);
3065 }
3066
3067 // Checks whether offset is aligned.
3068 // Returns true if it is, else false.
3069 bool MacroAssembler::merge_alignment_check(Register base,
3070 size_t size,
3071 int64_t cur_offset,
3072 int64_t prev_offset) const {
3073 if (AvoidUnalignedAccesses) {
3074 if (base == sp) {
3075 // Checks whether low offset if aligned to pair of registers.
3076 int64_t pair_mask = size * 2 - 1;
3077 int64_t offset = prev_offset > cur_offset ? cur_offset : prev_offset;
3078 return (offset & pair_mask) == 0;
3079 } else { // If base is not sp, we can't guarantee the access is aligned.
3080 return false;
3081 }
3082 } else {
3083 int64_t mask = size - 1;
3084 // Load/store pair instruction only supports element size aligned offset.
3085 return (cur_offset & mask) == 0 && (prev_offset & mask) == 0;
3086 }
3087 }
3088
3089 // Checks whether current and previous loads/stores can be merged.
3090 // Returns true if it can be merged, else false.
3091 bool MacroAssembler::ldst_can_merge(Register rt,
3092 const Address &adr,
3093 size_t cur_size_in_bytes,
3094 bool is_store) const {
3095 address prev = pc() - NativeInstruction::instruction_size;
3096 address last = code()->last_insn();
3097
3098 if (last == nullptr || !nativeInstruction_at(last)->is_Imm_LdSt()) {
3099 return false;
3100 }
3101
3102 if (adr.getMode() != Address::base_plus_offset || prev != last) {
3103 return false;
3104 }
3105
3106 NativeLdSt* prev_ldst = NativeLdSt_at(prev);
3107 size_t prev_size_in_bytes = prev_ldst->size_in_bytes();
3108
3109 assert(prev_size_in_bytes == 4 || prev_size_in_bytes == 8, "only supports 64/32bit merging.");
3110 assert(cur_size_in_bytes == 4 || cur_size_in_bytes == 8, "only supports 64/32bit merging.");
3111
3112 if (cur_size_in_bytes != prev_size_in_bytes || is_store != prev_ldst->is_store()) {
3113 return false;
3114 }
3115
3116 int64_t max_offset = 63 * prev_size_in_bytes;
3117 int64_t min_offset = -64 * prev_size_in_bytes;
3118
3119 assert(prev_ldst->is_not_pre_post_index(), "pre-index or post-index is not supported to be merged.");
3120
3121 // Only same base can be merged.
3122 if (adr.base() != prev_ldst->base()) {
3123 return false;
3124 }
3125
3126 int64_t cur_offset = adr.offset();
3127 int64_t prev_offset = prev_ldst->offset();
3128 size_t diff = abs(cur_offset - prev_offset);
3129 if (diff != prev_size_in_bytes) {
3130 return false;
3131 }
3132
3133 // Following cases can not be merged:
3134 // ldr x2, [x2, #8]
3135 // ldr x3, [x2, #16]
3136 // or:
3137 // ldr x2, [x3, #8]
3138 // ldr x2, [x3, #16]
3139 // If t1 and t2 is the same in "ldp t1, t2, [xn, #imm]", we'll get SIGILL.
3140 if (!is_store && (adr.base() == prev_ldst->target() || rt == prev_ldst->target())) {
3141 return false;
3142 }
3143
3144 int64_t low_offset = prev_offset > cur_offset ? cur_offset : prev_offset;
3145 // Offset range must be in ldp/stp instruction's range.
3146 if (low_offset > max_offset || low_offset < min_offset) {
3147 return false;
3148 }
3149
3150 if (merge_alignment_check(adr.base(), prev_size_in_bytes, cur_offset, prev_offset)) {
3151 return true;
3152 }
3153
3154 return false;
3155 }
3156
3157 // Merge current load/store with previous load/store into ldp/stp.
3158 void MacroAssembler::merge_ldst(Register rt,
3159 const Address &adr,
3160 size_t cur_size_in_bytes,
3161 bool is_store) {
3162
3163 assert(ldst_can_merge(rt, adr, cur_size_in_bytes, is_store) == true, "cur and prev must be able to be merged.");
3164
3165 Register rt_low, rt_high;
3166 address prev = pc() - NativeInstruction::instruction_size;
3167 NativeLdSt* prev_ldst = NativeLdSt_at(prev);
3168
3169 int64_t offset;
3170
3171 if (adr.offset() < prev_ldst->offset()) {
3172 offset = adr.offset();
3173 rt_low = rt;
3174 rt_high = prev_ldst->target();
3175 } else {
3176 offset = prev_ldst->offset();
3177 rt_low = prev_ldst->target();
3178 rt_high = rt;
3179 }
3180
3181 Address adr_p = Address(prev_ldst->base(), offset);
3182 // Overwrite previous generated binary.
3183 code_section()->set_end(prev);
3184
3185 const size_t sz = prev_ldst->size_in_bytes();
3186 assert(sz == 8 || sz == 4, "only supports 64/32bit merging.");
3187 if (!is_store) {
3188 BLOCK_COMMENT("merged ldr pair");
3189 if (sz == 8) {
3190 ldp(rt_low, rt_high, adr_p);
3191 } else {
3192 ldpw(rt_low, rt_high, adr_p);
3193 }
3194 } else {
3195 BLOCK_COMMENT("merged str pair");
3196 if (sz == 8) {
3197 stp(rt_low, rt_high, adr_p);
3198 } else {
3199 stpw(rt_low, rt_high, adr_p);
3200 }
3201 }
3202 }
3203
3204 /**
3205 * Multiply 64 bit by 64 bit first loop.
3206 */
3207 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart,
3208 Register y, Register y_idx, Register z,
3209 Register carry, Register product,
3210 Register idx, Register kdx) {
3211 //
3212 // jlong carry, x[], y[], z[];
3213 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) {
3214 // huge_128 product = y[idx] * x[xstart] + carry;
3215 // z[kdx] = (jlong)product;
3216 // carry = (jlong)(product >>> 64);
3217 // }
3218 // z[xstart] = carry;
3219 //
3220
3221 Label L_first_loop, L_first_loop_exit;
3222 Label L_one_x, L_one_y, L_multiply;
3223
3224 subsw(xstart, xstart, 1);
3225 br(Assembler::MI, L_one_x);
3226
3227 lea(rscratch1, Address(x, xstart, Address::lsl(LogBytesPerInt)));
3228 ldr(x_xstart, Address(rscratch1));
3229 ror(x_xstart, x_xstart, 32); // convert big-endian to little-endian
3230
3231 bind(L_first_loop);
3232 subsw(idx, idx, 1);
3233 br(Assembler::MI, L_first_loop_exit);
3234 subsw(idx, idx, 1);
3235 br(Assembler::MI, L_one_y);
3236 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt)));
3237 ldr(y_idx, Address(rscratch1));
3238 ror(y_idx, y_idx, 32); // convert big-endian to little-endian
3239 bind(L_multiply);
3240
3241 // AArch64 has a multiply-accumulate instruction that we can't use
3242 // here because it has no way to process carries, so we have to use
3243 // separate add and adc instructions. Bah.
3244 umulh(rscratch1, x_xstart, y_idx); // x_xstart * y_idx -> rscratch1:product
3245 mul(product, x_xstart, y_idx);
3246 adds(product, product, carry);
3247 adc(carry, rscratch1, zr); // x_xstart * y_idx + carry -> carry:product
3248
3249 subw(kdx, kdx, 2);
3250 ror(product, product, 32); // back to big-endian
3251 str(product, offsetted_address(z, kdx, Address::uxtw(LogBytesPerInt), 0, BytesPerLong));
3252
3253 b(L_first_loop);
3254
3255 bind(L_one_y);
3256 ldrw(y_idx, Address(y, 0));
3257 b(L_multiply);
3258
3259 bind(L_one_x);
3260 ldrw(x_xstart, Address(x, 0));
3261 b(L_first_loop);
3262
3263 bind(L_first_loop_exit);
3264 }
3265
3266 /**
3267 * Multiply 128 bit by 128. Unrolled inner loop.
3268 *
3269 */
3270 void MacroAssembler::multiply_128_x_128_loop(Register y, Register z,
3271 Register carry, Register carry2,
3272 Register idx, Register jdx,
3273 Register yz_idx1, Register yz_idx2,
3274 Register tmp, Register tmp3, Register tmp4,
3275 Register tmp6, Register product_hi) {
3276
3277 // jlong carry, x[], y[], z[];
3278 // int kdx = ystart+1;
3279 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop
3280 // huge_128 tmp3 = (y[idx+1] * product_hi) + z[kdx+idx+1] + carry;
3281 // jlong carry2 = (jlong)(tmp3 >>> 64);
3282 // huge_128 tmp4 = (y[idx] * product_hi) + z[kdx+idx] + carry2;
3283 // carry = (jlong)(tmp4 >>> 64);
3284 // z[kdx+idx+1] = (jlong)tmp3;
3285 // z[kdx+idx] = (jlong)tmp4;
3286 // }
3287 // idx += 2;
3288 // if (idx > 0) {
3289 // yz_idx1 = (y[idx] * product_hi) + z[kdx+idx] + carry;
3290 // z[kdx+idx] = (jlong)yz_idx1;
3291 // carry = (jlong)(yz_idx1 >>> 64);
3292 // }
3293 //
3294
3295 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done;
3296
3297 lsrw(jdx, idx, 2);
3298
3299 bind(L_third_loop);
3300
3301 subsw(jdx, jdx, 1);
3302 br(Assembler::MI, L_third_loop_exit);
3303 subw(idx, idx, 4);
3304
3305 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt)));
3306
3307 ldp(yz_idx2, yz_idx1, Address(rscratch1, 0));
3308
3309 lea(tmp6, Address(z, idx, Address::uxtw(LogBytesPerInt)));
3310
3311 ror(yz_idx1, yz_idx1, 32); // convert big-endian to little-endian
3312 ror(yz_idx2, yz_idx2, 32);
3313
3314 ldp(rscratch2, rscratch1, Address(tmp6, 0));
3315
3316 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3
3317 umulh(tmp4, product_hi, yz_idx1);
3318
3319 ror(rscratch1, rscratch1, 32); // convert big-endian to little-endian
3320 ror(rscratch2, rscratch2, 32);
3321
3322 mul(tmp, product_hi, yz_idx2); // yz_idx2 * product_hi -> carry2:tmp
3323 umulh(carry2, product_hi, yz_idx2);
3324
3325 // propagate sum of both multiplications into carry:tmp4:tmp3
3326 adds(tmp3, tmp3, carry);
3327 adc(tmp4, tmp4, zr);
3328 adds(tmp3, tmp3, rscratch1);
3329 adcs(tmp4, tmp4, tmp);
3330 adc(carry, carry2, zr);
3331 adds(tmp4, tmp4, rscratch2);
3332 adc(carry, carry, zr);
3333
3334 ror(tmp3, tmp3, 32); // convert little-endian to big-endian
3335 ror(tmp4, tmp4, 32);
3336 stp(tmp4, tmp3, Address(tmp6, 0));
3337
3338 b(L_third_loop);
3339 bind (L_third_loop_exit);
3340
3341 andw (idx, idx, 0x3);
3342 cbz(idx, L_post_third_loop_done);
3343
3344 Label L_check_1;
3345 subsw(idx, idx, 2);
3346 br(Assembler::MI, L_check_1);
3347
3348 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt)));
3349 ldr(yz_idx1, Address(rscratch1, 0));
3350 ror(yz_idx1, yz_idx1, 32);
3351 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3
3352 umulh(tmp4, product_hi, yz_idx1);
3353 lea(rscratch1, Address(z, idx, Address::uxtw(LogBytesPerInt)));
3354 ldr(yz_idx2, Address(rscratch1, 0));
3355 ror(yz_idx2, yz_idx2, 32);
3356
3357 add2_with_carry(carry, tmp4, tmp3, carry, yz_idx2);
3358
3359 ror(tmp3, tmp3, 32);
3360 str(tmp3, Address(rscratch1, 0));
3361
3362 bind (L_check_1);
3363
3364 andw (idx, idx, 0x1);
3365 subsw(idx, idx, 1);
3366 br(Assembler::MI, L_post_third_loop_done);
3367 ldrw(tmp4, Address(y, idx, Address::uxtw(LogBytesPerInt)));
3368 mul(tmp3, tmp4, product_hi); // tmp4 * product_hi -> carry2:tmp3
3369 umulh(carry2, tmp4, product_hi);
3370 ldrw(tmp4, Address(z, idx, Address::uxtw(LogBytesPerInt)));
3371
3372 add2_with_carry(carry2, tmp3, tmp4, carry);
3373
3374 strw(tmp3, Address(z, idx, Address::uxtw(LogBytesPerInt)));
3375 extr(carry, carry2, tmp3, 32);
3376
3377 bind(L_post_third_loop_done);
3378 }
3379
3380 /**
3381 * Code for BigInteger::multiplyToLen() intrinsic.
3382 *
3383 * r0: x
3384 * r1: xlen
3385 * r2: y
3386 * r3: ylen
3387 * r4: z
3388 * r5: zlen
3389 * r10: tmp1
3390 * r11: tmp2
3391 * r12: tmp3
3392 * r13: tmp4
3393 * r14: tmp5
3394 * r15: tmp6
3395 * r16: tmp7
3396 *
3397 */
3398 void MacroAssembler::multiply_to_len(Register x, Register xlen, Register y, Register ylen,
3399 Register z, Register zlen,
3400 Register tmp1, Register tmp2, Register tmp3, Register tmp4,
3401 Register tmp5, Register tmp6, Register product_hi) {
3402
3403 assert_different_registers(x, xlen, y, ylen, z, zlen, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6);
3404
3405 const Register idx = tmp1;
3406 const Register kdx = tmp2;
3407 const Register xstart = tmp3;
3408
3409 const Register y_idx = tmp4;
3410 const Register carry = tmp5;
3411 const Register product = xlen;
3412 const Register x_xstart = zlen; // reuse register
3413
3414 // First Loop.
3415 //
3416 // final static long LONG_MASK = 0xffffffffL;
3417 // int xstart = xlen - 1;
3418 // int ystart = ylen - 1;
3419 // long carry = 0;
3420 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) {
3421 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry;
3422 // z[kdx] = (int)product;
3423 // carry = product >>> 32;
3424 // }
3425 // z[xstart] = (int)carry;
3426 //
3427
3428 movw(idx, ylen); // idx = ylen;
3429 movw(kdx, zlen); // kdx = xlen+ylen;
3430 mov(carry, zr); // carry = 0;
3431
3432 Label L_done;
3433
3434 movw(xstart, xlen);
3435 subsw(xstart, xstart, 1);
3436 br(Assembler::MI, L_done);
3437
3438 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx);
3439
3440 Label L_second_loop;
3441 cbzw(kdx, L_second_loop);
3442
3443 Label L_carry;
3444 subw(kdx, kdx, 1);
3445 cbzw(kdx, L_carry);
3446
3447 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt)));
3448 lsr(carry, carry, 32);
3449 subw(kdx, kdx, 1);
3450
3451 bind(L_carry);
3452 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt)));
3453
3454 // Second and third (nested) loops.
3455 //
3456 // for (int i = xstart-1; i >= 0; i--) { // Second loop
3457 // carry = 0;
3458 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop
3459 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) +
3460 // (z[k] & LONG_MASK) + carry;
3461 // z[k] = (int)product;
3462 // carry = product >>> 32;
3463 // }
3464 // z[i] = (int)carry;
3465 // }
3466 //
3467 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = product_hi
3468
3469 const Register jdx = tmp1;
3470
3471 bind(L_second_loop);
3472 mov(carry, zr); // carry = 0;
3473 movw(jdx, ylen); // j = ystart+1
3474
3475 subsw(xstart, xstart, 1); // i = xstart-1;
3476 br(Assembler::MI, L_done);
3477
3478 str(z, Address(pre(sp, -4 * wordSize)));
3479
3480 Label L_last_x;
3481 lea(z, offsetted_address(z, xstart, Address::uxtw(LogBytesPerInt), 4, BytesPerInt)); // z = z + k - j
3482 subsw(xstart, xstart, 1); // i = xstart-1;
3483 br(Assembler::MI, L_last_x);
3484
3485 lea(rscratch1, Address(x, xstart, Address::uxtw(LogBytesPerInt)));
3486 ldr(product_hi, Address(rscratch1));
3487 ror(product_hi, product_hi, 32); // convert big-endian to little-endian
3488
3489 Label L_third_loop_prologue;
3490 bind(L_third_loop_prologue);
3491
3492 str(ylen, Address(sp, wordSize));
3493 stp(x, xstart, Address(sp, 2 * wordSize));
3494 multiply_128_x_128_loop(y, z, carry, x, jdx, ylen, product,
3495 tmp2, x_xstart, tmp3, tmp4, tmp6, product_hi);
3496 ldp(z, ylen, Address(post(sp, 2 * wordSize)));
3497 ldp(x, xlen, Address(post(sp, 2 * wordSize))); // copy old xstart -> xlen
3498
3499 addw(tmp3, xlen, 1);
3500 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt)));
3501 subsw(tmp3, tmp3, 1);
3502 br(Assembler::MI, L_done);
3503
3504 lsr(carry, carry, 32);
3505 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt)));
3506 b(L_second_loop);
3507
3508 // Next infrequent code is moved outside loops.
3509 bind(L_last_x);
3510 ldrw(product_hi, Address(x, 0));
3511 b(L_third_loop_prologue);
3512
3513 bind(L_done);
3514 }
3515
3516 // Code for BigInteger::mulAdd intrinsic
3517 // out = r0
3518 // in = r1
3519 // offset = r2 (already out.length-offset)
3520 // len = r3
3521 // k = r4
3522 //
3523 // pseudo code from java implementation:
3524 // carry = 0;
3525 // offset = out.length-offset - 1;
3526 // for (int j=len-1; j >= 0; j--) {
3527 // product = (in[j] & LONG_MASK) * kLong + (out[offset] & LONG_MASK) + carry;
3528 // out[offset--] = (int)product;
3529 // carry = product >>> 32;
3530 // }
3531 // return (int)carry;
3532 void MacroAssembler::mul_add(Register out, Register in, Register offset,
3533 Register len, Register k) {
3534 Label LOOP, END;
3535 // pre-loop
3536 cmp(len, zr); // cmp, not cbz/cbnz: to use condition twice => less branches
3537 csel(out, zr, out, Assembler::EQ);
3538 br(Assembler::EQ, END);
3539 add(in, in, len, LSL, 2); // in[j+1] address
3540 add(offset, out, offset, LSL, 2); // out[offset + 1] address
3541 mov(out, zr); // used to keep carry now
3542 BIND(LOOP);
3543 ldrw(rscratch1, Address(pre(in, -4)));
3544 madd(rscratch1, rscratch1, k, out);
3545 ldrw(rscratch2, Address(pre(offset, -4)));
3546 add(rscratch1, rscratch1, rscratch2);
3547 strw(rscratch1, Address(offset));
3548 lsr(out, rscratch1, 32);
3549 subs(len, len, 1);
3550 br(Assembler::NE, LOOP);
3551 BIND(END);
3552 }
3553
3554 /**
3555 * Emits code to update CRC-32 with a byte value according to constants in table
3556 *
3557 * @param [in,out]crc Register containing the crc.
3558 * @param [in]val Register containing the byte to fold into the CRC.
3559 * @param [in]table Register containing the table of crc constants.
3560 *
3561 * uint32_t crc;
3562 * val = crc_table[(val ^ crc) & 0xFF];
3563 * crc = val ^ (crc >> 8);
3564 *
3565 */
3566 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) {
3567 eor(val, val, crc);
3568 andr(val, val, 0xff);
3569 ldrw(val, Address(table, val, Address::lsl(2)));
3570 eor(crc, val, crc, Assembler::LSR, 8);
3571 }
3572
3573 /**
3574 * Emits code to update CRC-32 with a 32-bit value according to tables 0 to 3
3575 *
3576 * @param [in,out]crc Register containing the crc.
3577 * @param [in]v Register containing the 32-bit to fold into the CRC.
3578 * @param [in]table0 Register containing table 0 of crc constants.
3579 * @param [in]table1 Register containing table 1 of crc constants.
3580 * @param [in]table2 Register containing table 2 of crc constants.
3581 * @param [in]table3 Register containing table 3 of crc constants.
3582 *
3583 * uint32_t crc;
3584 * v = crc ^ v
3585 * crc = table3[v&0xff]^table2[(v>>8)&0xff]^table1[(v>>16)&0xff]^table0[v>>24]
3586 *
3587 */
3588 void MacroAssembler::update_word_crc32(Register crc, Register v, Register tmp,
3589 Register table0, Register table1, Register table2, Register table3,
3590 bool upper) {
3591 eor(v, crc, v, upper ? LSR:LSL, upper ? 32:0);
3592 uxtb(tmp, v);
3593 ldrw(crc, Address(table3, tmp, Address::lsl(2)));
3594 ubfx(tmp, v, 8, 8);
3595 ldrw(tmp, Address(table2, tmp, Address::lsl(2)));
3596 eor(crc, crc, tmp);
3597 ubfx(tmp, v, 16, 8);
3598 ldrw(tmp, Address(table1, tmp, Address::lsl(2)));
3599 eor(crc, crc, tmp);
3600 ubfx(tmp, v, 24, 8);
3601 ldrw(tmp, Address(table0, tmp, Address::lsl(2)));
3602 eor(crc, crc, tmp);
3603 }
3604
3605 void MacroAssembler::kernel_crc32_using_crypto_pmull(Register crc, Register buf,
3606 Register len, Register tmp0, Register tmp1, Register tmp2, Register tmp3) {
3607 Label CRC_by4_loop, CRC_by1_loop, CRC_less128, CRC_by128_pre, CRC_by32_loop, CRC_less32, L_exit;
3608 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2);
3609
3610 subs(tmp0, len, 384);
3611 mvnw(crc, crc);
3612 br(Assembler::GE, CRC_by128_pre);
3613 BIND(CRC_less128);
3614 subs(len, len, 32);
3615 br(Assembler::GE, CRC_by32_loop);
3616 BIND(CRC_less32);
3617 adds(len, len, 32 - 4);
3618 br(Assembler::GE, CRC_by4_loop);
3619 adds(len, len, 4);
3620 br(Assembler::GT, CRC_by1_loop);
3621 b(L_exit);
3622
3623 BIND(CRC_by32_loop);
3624 ldp(tmp0, tmp1, Address(buf));
3625 crc32x(crc, crc, tmp0);
3626 ldp(tmp2, tmp3, Address(buf, 16));
3627 crc32x(crc, crc, tmp1);
3628 add(buf, buf, 32);
3629 crc32x(crc, crc, tmp2);
3630 subs(len, len, 32);
3631 crc32x(crc, crc, tmp3);
3632 br(Assembler::GE, CRC_by32_loop);
3633 cmn(len, (u1)32);
3634 br(Assembler::NE, CRC_less32);
3635 b(L_exit);
3636
3637 BIND(CRC_by4_loop);
3638 ldrw(tmp0, Address(post(buf, 4)));
3639 subs(len, len, 4);
3640 crc32w(crc, crc, tmp0);
3641 br(Assembler::GE, CRC_by4_loop);
3642 adds(len, len, 4);
3643 br(Assembler::LE, L_exit);
3644 BIND(CRC_by1_loop);
3645 ldrb(tmp0, Address(post(buf, 1)));
3646 subs(len, len, 1);
3647 crc32b(crc, crc, tmp0);
3648 br(Assembler::GT, CRC_by1_loop);
3649 b(L_exit);
3650
3651 BIND(CRC_by128_pre);
3652 kernel_crc32_common_fold_using_crypto_pmull(crc, buf, len, tmp0, tmp1, tmp2,
3653 4*256*sizeof(juint) + 8*sizeof(juint));
3654 mov(crc, 0);
3655 crc32x(crc, crc, tmp0);
3656 crc32x(crc, crc, tmp1);
3657
3658 cbnz(len, CRC_less128);
3659
3660 BIND(L_exit);
3661 mvnw(crc, crc);
3662 }
3663
3664 void MacroAssembler::kernel_crc32_using_crc32(Register crc, Register buf,
3665 Register len, Register tmp0, Register tmp1, Register tmp2,
3666 Register tmp3) {
3667 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop, CRC_less64, CRC_by64_pre, CRC_by32_loop, CRC_less32, L_exit;
3668 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2, tmp3);
3669
3670 mvnw(crc, crc);
3671
3672 subs(len, len, 128);
3673 br(Assembler::GE, CRC_by64_pre);
3674 BIND(CRC_less64);
3675 adds(len, len, 128-32);
3676 br(Assembler::GE, CRC_by32_loop);
3677 BIND(CRC_less32);
3678 adds(len, len, 32-4);
3679 br(Assembler::GE, CRC_by4_loop);
3680 adds(len, len, 4);
3681 br(Assembler::GT, CRC_by1_loop);
3682 b(L_exit);
3683
3684 BIND(CRC_by32_loop);
3685 ldp(tmp0, tmp1, Address(post(buf, 16)));
3686 subs(len, len, 32);
3687 crc32x(crc, crc, tmp0);
3688 ldr(tmp2, Address(post(buf, 8)));
3689 crc32x(crc, crc, tmp1);
3690 ldr(tmp3, Address(post(buf, 8)));
3691 crc32x(crc, crc, tmp2);
3692 crc32x(crc, crc, tmp3);
3693 br(Assembler::GE, CRC_by32_loop);
3694 cmn(len, (u1)32);
3695 br(Assembler::NE, CRC_less32);
3696 b(L_exit);
3697
3698 BIND(CRC_by4_loop);
3699 ldrw(tmp0, Address(post(buf, 4)));
3700 subs(len, len, 4);
3701 crc32w(crc, crc, tmp0);
3702 br(Assembler::GE, CRC_by4_loop);
3703 adds(len, len, 4);
3704 br(Assembler::LE, L_exit);
3705 BIND(CRC_by1_loop);
3706 ldrb(tmp0, Address(post(buf, 1)));
3707 subs(len, len, 1);
3708 crc32b(crc, crc, tmp0);
3709 br(Assembler::GT, CRC_by1_loop);
3710 b(L_exit);
3711
3712 BIND(CRC_by64_pre);
3713 sub(buf, buf, 8);
3714 ldp(tmp0, tmp1, Address(buf, 8));
3715 crc32x(crc, crc, tmp0);
3716 ldr(tmp2, Address(buf, 24));
3717 crc32x(crc, crc, tmp1);
3718 ldr(tmp3, Address(buf, 32));
3719 crc32x(crc, crc, tmp2);
3720 ldr(tmp0, Address(buf, 40));
3721 crc32x(crc, crc, tmp3);
3722 ldr(tmp1, Address(buf, 48));
3723 crc32x(crc, crc, tmp0);
3724 ldr(tmp2, Address(buf, 56));
3725 crc32x(crc, crc, tmp1);
3726 ldr(tmp3, Address(pre(buf, 64)));
3727
3728 b(CRC_by64_loop);
3729
3730 align(CodeEntryAlignment);
3731 BIND(CRC_by64_loop);
3732 subs(len, len, 64);
3733 crc32x(crc, crc, tmp2);
3734 ldr(tmp0, Address(buf, 8));
3735 crc32x(crc, crc, tmp3);
3736 ldr(tmp1, Address(buf, 16));
3737 crc32x(crc, crc, tmp0);
3738 ldr(tmp2, Address(buf, 24));
3739 crc32x(crc, crc, tmp1);
3740 ldr(tmp3, Address(buf, 32));
3741 crc32x(crc, crc, tmp2);
3742 ldr(tmp0, Address(buf, 40));
3743 crc32x(crc, crc, tmp3);
3744 ldr(tmp1, Address(buf, 48));
3745 crc32x(crc, crc, tmp0);
3746 ldr(tmp2, Address(buf, 56));
3747 crc32x(crc, crc, tmp1);
3748 ldr(tmp3, Address(pre(buf, 64)));
3749 br(Assembler::GE, CRC_by64_loop);
3750
3751 // post-loop
3752 crc32x(crc, crc, tmp2);
3753 crc32x(crc, crc, tmp3);
3754
3755 sub(len, len, 64);
3756 add(buf, buf, 8);
3757 cmn(len, (u1)128);
3758 br(Assembler::NE, CRC_less64);
3759 BIND(L_exit);
3760 mvnw(crc, crc);
3761 }
3762
3763 /**
3764 * @param crc register containing existing CRC (32-bit)
3765 * @param buf register pointing to input byte buffer (byte*)
3766 * @param len register containing number of bytes
3767 * @param table register that will contain address of CRC table
3768 * @param tmp scratch register
3769 */
3770 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len,
3771 Register table0, Register table1, Register table2, Register table3,
3772 Register tmp, Register tmp2, Register tmp3) {
3773 Label L_by16, L_by16_loop, L_by4, L_by4_loop, L_by1, L_by1_loop, L_exit;
3774
3775 if (UseCryptoPmullForCRC32) {
3776 kernel_crc32_using_crypto_pmull(crc, buf, len, table0, table1, table2, table3);
3777 return;
3778 }
3779
3780 if (UseCRC32) {
3781 kernel_crc32_using_crc32(crc, buf, len, table0, table1, table2, table3);
3782 return;
3783 }
3784
3785 mvnw(crc, crc);
3786
3787 {
3788 uint64_t offset;
3789 adrp(table0, ExternalAddress(StubRoutines::crc_table_addr()), offset);
3790 add(table0, table0, offset);
3791 }
3792 add(table1, table0, 1*256*sizeof(juint));
3793 add(table2, table0, 2*256*sizeof(juint));
3794 add(table3, table0, 3*256*sizeof(juint));
3795
3796 if (UseNeon) {
3797 cmp(len, (u1)64);
3798 br(Assembler::LT, L_by16);
3799 eor(v16, T16B, v16, v16);
3800
3801 Label L_fold;
3802
3803 add(tmp, table0, 4*256*sizeof(juint)); // Point at the Neon constants
3804
3805 ld1(v0, v1, T2D, post(buf, 32));
3806 ld1r(v4, T2D, post(tmp, 8));
3807 ld1r(v5, T2D, post(tmp, 8));
3808 ld1r(v6, T2D, post(tmp, 8));
3809 ld1r(v7, T2D, post(tmp, 8));
3810 mov(v16, S, 0, crc);
3811
3812 eor(v0, T16B, v0, v16);
3813 sub(len, len, 64);
3814
3815 BIND(L_fold);
3816 pmull(v22, T8H, v0, v5, T8B);
3817 pmull(v20, T8H, v0, v7, T8B);
3818 pmull(v23, T8H, v0, v4, T8B);
3819 pmull(v21, T8H, v0, v6, T8B);
3820
3821 pmull2(v18, T8H, v0, v5, T16B);
3822 pmull2(v16, T8H, v0, v7, T16B);
3823 pmull2(v19, T8H, v0, v4, T16B);
3824 pmull2(v17, T8H, v0, v6, T16B);
3825
3826 uzp1(v24, T8H, v20, v22);
3827 uzp2(v25, T8H, v20, v22);
3828 eor(v20, T16B, v24, v25);
3829
3830 uzp1(v26, T8H, v16, v18);
3831 uzp2(v27, T8H, v16, v18);
3832 eor(v16, T16B, v26, v27);
3833
3834 ushll2(v22, T4S, v20, T8H, 8);
3835 ushll(v20, T4S, v20, T4H, 8);
3836
3837 ushll2(v18, T4S, v16, T8H, 8);
3838 ushll(v16, T4S, v16, T4H, 8);
3839
3840 eor(v22, T16B, v23, v22);
3841 eor(v18, T16B, v19, v18);
3842 eor(v20, T16B, v21, v20);
3843 eor(v16, T16B, v17, v16);
3844
3845 uzp1(v17, T2D, v16, v20);
3846 uzp2(v21, T2D, v16, v20);
3847 eor(v17, T16B, v17, v21);
3848
3849 ushll2(v20, T2D, v17, T4S, 16);
3850 ushll(v16, T2D, v17, T2S, 16);
3851
3852 eor(v20, T16B, v20, v22);
3853 eor(v16, T16B, v16, v18);
3854
3855 uzp1(v17, T2D, v20, v16);
3856 uzp2(v21, T2D, v20, v16);
3857 eor(v28, T16B, v17, v21);
3858
3859 pmull(v22, T8H, v1, v5, T8B);
3860 pmull(v20, T8H, v1, v7, T8B);
3861 pmull(v23, T8H, v1, v4, T8B);
3862 pmull(v21, T8H, v1, v6, T8B);
3863
3864 pmull2(v18, T8H, v1, v5, T16B);
3865 pmull2(v16, T8H, v1, v7, T16B);
3866 pmull2(v19, T8H, v1, v4, T16B);
3867 pmull2(v17, T8H, v1, v6, T16B);
3868
3869 ld1(v0, v1, T2D, post(buf, 32));
3870
3871 uzp1(v24, T8H, v20, v22);
3872 uzp2(v25, T8H, v20, v22);
3873 eor(v20, T16B, v24, v25);
3874
3875 uzp1(v26, T8H, v16, v18);
3876 uzp2(v27, T8H, v16, v18);
3877 eor(v16, T16B, v26, v27);
3878
3879 ushll2(v22, T4S, v20, T8H, 8);
3880 ushll(v20, T4S, v20, T4H, 8);
3881
3882 ushll2(v18, T4S, v16, T8H, 8);
3883 ushll(v16, T4S, v16, T4H, 8);
3884
3885 eor(v22, T16B, v23, v22);
3886 eor(v18, T16B, v19, v18);
3887 eor(v20, T16B, v21, v20);
3888 eor(v16, T16B, v17, v16);
3889
3890 uzp1(v17, T2D, v16, v20);
3891 uzp2(v21, T2D, v16, v20);
3892 eor(v16, T16B, v17, v21);
3893
3894 ushll2(v20, T2D, v16, T4S, 16);
3895 ushll(v16, T2D, v16, T2S, 16);
3896
3897 eor(v20, T16B, v22, v20);
3898 eor(v16, T16B, v16, v18);
3899
3900 uzp1(v17, T2D, v20, v16);
3901 uzp2(v21, T2D, v20, v16);
3902 eor(v20, T16B, v17, v21);
3903
3904 shl(v16, T2D, v28, 1);
3905 shl(v17, T2D, v20, 1);
3906
3907 eor(v0, T16B, v0, v16);
3908 eor(v1, T16B, v1, v17);
3909
3910 subs(len, len, 32);
3911 br(Assembler::GE, L_fold);
3912
3913 mov(crc, 0);
3914 mov(tmp, v0, D, 0);
3915 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
3916 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
3917 mov(tmp, v0, D, 1);
3918 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
3919 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
3920 mov(tmp, v1, D, 0);
3921 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
3922 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
3923 mov(tmp, v1, D, 1);
3924 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
3925 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
3926
3927 add(len, len, 32);
3928 }
3929
3930 BIND(L_by16);
3931 subs(len, len, 16);
3932 br(Assembler::GE, L_by16_loop);
3933 adds(len, len, 16-4);
3934 br(Assembler::GE, L_by4_loop);
3935 adds(len, len, 4);
3936 br(Assembler::GT, L_by1_loop);
3937 b(L_exit);
3938
3939 BIND(L_by4_loop);
3940 ldrw(tmp, Address(post(buf, 4)));
3941 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3);
3942 subs(len, len, 4);
3943 br(Assembler::GE, L_by4_loop);
3944 adds(len, len, 4);
3945 br(Assembler::LE, L_exit);
3946 BIND(L_by1_loop);
3947 subs(len, len, 1);
3948 ldrb(tmp, Address(post(buf, 1)));
3949 update_byte_crc32(crc, tmp, table0);
3950 br(Assembler::GT, L_by1_loop);
3951 b(L_exit);
3952
3953 align(CodeEntryAlignment);
3954 BIND(L_by16_loop);
3955 subs(len, len, 16);
3956 ldp(tmp, tmp3, Address(post(buf, 16)));
3957 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false);
3958 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true);
3959 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, false);
3960 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, true);
3961 br(Assembler::GE, L_by16_loop);
3962 adds(len, len, 16-4);
3963 br(Assembler::GE, L_by4_loop);
3964 adds(len, len, 4);
3965 br(Assembler::GT, L_by1_loop);
3966 BIND(L_exit);
3967 mvnw(crc, crc);
3968 }
3969
3970 void MacroAssembler::kernel_crc32c_using_crypto_pmull(Register crc, Register buf,
3971 Register len, Register tmp0, Register tmp1, Register tmp2, Register tmp3) {
3972 Label CRC_by4_loop, CRC_by1_loop, CRC_less128, CRC_by128_pre, CRC_by32_loop, CRC_less32, L_exit;
3973 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2);
3974
3975 subs(tmp0, len, 384);
3976 br(Assembler::GE, CRC_by128_pre);
3977 BIND(CRC_less128);
3978 subs(len, len, 32);
3979 br(Assembler::GE, CRC_by32_loop);
3980 BIND(CRC_less32);
3981 adds(len, len, 32 - 4);
3982 br(Assembler::GE, CRC_by4_loop);
3983 adds(len, len, 4);
3984 br(Assembler::GT, CRC_by1_loop);
3985 b(L_exit);
3986
3987 BIND(CRC_by32_loop);
3988 ldp(tmp0, tmp1, Address(buf));
3989 crc32cx(crc, crc, tmp0);
3990 ldr(tmp2, Address(buf, 16));
3991 crc32cx(crc, crc, tmp1);
3992 ldr(tmp3, Address(buf, 24));
3993 crc32cx(crc, crc, tmp2);
3994 add(buf, buf, 32);
3995 subs(len, len, 32);
3996 crc32cx(crc, crc, tmp3);
3997 br(Assembler::GE, CRC_by32_loop);
3998 cmn(len, (u1)32);
3999 br(Assembler::NE, CRC_less32);
4000 b(L_exit);
4001
4002 BIND(CRC_by4_loop);
4003 ldrw(tmp0, Address(post(buf, 4)));
4004 subs(len, len, 4);
4005 crc32cw(crc, crc, tmp0);
4006 br(Assembler::GE, CRC_by4_loop);
4007 adds(len, len, 4);
4008 br(Assembler::LE, L_exit);
4009 BIND(CRC_by1_loop);
4010 ldrb(tmp0, Address(post(buf, 1)));
4011 subs(len, len, 1);
4012 crc32cb(crc, crc, tmp0);
4013 br(Assembler::GT, CRC_by1_loop);
4014 b(L_exit);
4015
4016 BIND(CRC_by128_pre);
4017 kernel_crc32_common_fold_using_crypto_pmull(crc, buf, len, tmp0, tmp1, tmp2,
4018 4*256*sizeof(juint) + 8*sizeof(juint) + 0x50);
4019 mov(crc, 0);
4020 crc32cx(crc, crc, tmp0);
4021 crc32cx(crc, crc, tmp1);
4022
4023 cbnz(len, CRC_less128);
4024
4025 BIND(L_exit);
4026 }
4027
4028 void MacroAssembler::kernel_crc32c_using_crc32c(Register crc, Register buf,
4029 Register len, Register tmp0, Register tmp1, Register tmp2,
4030 Register tmp3) {
4031 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop, CRC_less64, CRC_by64_pre, CRC_by32_loop, CRC_less32, L_exit;
4032 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2, tmp3);
4033
4034 subs(len, len, 128);
4035 br(Assembler::GE, CRC_by64_pre);
4036 BIND(CRC_less64);
4037 adds(len, len, 128-32);
4038 br(Assembler::GE, CRC_by32_loop);
4039 BIND(CRC_less32);
4040 adds(len, len, 32-4);
4041 br(Assembler::GE, CRC_by4_loop);
4042 adds(len, len, 4);
4043 br(Assembler::GT, CRC_by1_loop);
4044 b(L_exit);
4045
4046 BIND(CRC_by32_loop);
4047 ldp(tmp0, tmp1, Address(post(buf, 16)));
4048 subs(len, len, 32);
4049 crc32cx(crc, crc, tmp0);
4050 ldr(tmp2, Address(post(buf, 8)));
4051 crc32cx(crc, crc, tmp1);
4052 ldr(tmp3, Address(post(buf, 8)));
4053 crc32cx(crc, crc, tmp2);
4054 crc32cx(crc, crc, tmp3);
4055 br(Assembler::GE, CRC_by32_loop);
4056 cmn(len, (u1)32);
4057 br(Assembler::NE, CRC_less32);
4058 b(L_exit);
4059
4060 BIND(CRC_by4_loop);
4061 ldrw(tmp0, Address(post(buf, 4)));
4062 subs(len, len, 4);
4063 crc32cw(crc, crc, tmp0);
4064 br(Assembler::GE, CRC_by4_loop);
4065 adds(len, len, 4);
4066 br(Assembler::LE, L_exit);
4067 BIND(CRC_by1_loop);
4068 ldrb(tmp0, Address(post(buf, 1)));
4069 subs(len, len, 1);
4070 crc32cb(crc, crc, tmp0);
4071 br(Assembler::GT, CRC_by1_loop);
4072 b(L_exit);
4073
4074 BIND(CRC_by64_pre);
4075 sub(buf, buf, 8);
4076 ldp(tmp0, tmp1, Address(buf, 8));
4077 crc32cx(crc, crc, tmp0);
4078 ldr(tmp2, Address(buf, 24));
4079 crc32cx(crc, crc, tmp1);
4080 ldr(tmp3, Address(buf, 32));
4081 crc32cx(crc, crc, tmp2);
4082 ldr(tmp0, Address(buf, 40));
4083 crc32cx(crc, crc, tmp3);
4084 ldr(tmp1, Address(buf, 48));
4085 crc32cx(crc, crc, tmp0);
4086 ldr(tmp2, Address(buf, 56));
4087 crc32cx(crc, crc, tmp1);
4088 ldr(tmp3, Address(pre(buf, 64)));
4089
4090 b(CRC_by64_loop);
4091
4092 align(CodeEntryAlignment);
4093 BIND(CRC_by64_loop);
4094 subs(len, len, 64);
4095 crc32cx(crc, crc, tmp2);
4096 ldr(tmp0, Address(buf, 8));
4097 crc32cx(crc, crc, tmp3);
4098 ldr(tmp1, Address(buf, 16));
4099 crc32cx(crc, crc, tmp0);
4100 ldr(tmp2, Address(buf, 24));
4101 crc32cx(crc, crc, tmp1);
4102 ldr(tmp3, Address(buf, 32));
4103 crc32cx(crc, crc, tmp2);
4104 ldr(tmp0, Address(buf, 40));
4105 crc32cx(crc, crc, tmp3);
4106 ldr(tmp1, Address(buf, 48));
4107 crc32cx(crc, crc, tmp0);
4108 ldr(tmp2, Address(buf, 56));
4109 crc32cx(crc, crc, tmp1);
4110 ldr(tmp3, Address(pre(buf, 64)));
4111 br(Assembler::GE, CRC_by64_loop);
4112
4113 // post-loop
4114 crc32cx(crc, crc, tmp2);
4115 crc32cx(crc, crc, tmp3);
4116
4117 sub(len, len, 64);
4118 add(buf, buf, 8);
4119 cmn(len, (u1)128);
4120 br(Assembler::NE, CRC_less64);
4121 BIND(L_exit);
4122 }
4123
4124 /**
4125 * @param crc register containing existing CRC (32-bit)
4126 * @param buf register pointing to input byte buffer (byte*)
4127 * @param len register containing number of bytes
4128 * @param table register that will contain address of CRC table
4129 * @param tmp scratch register
4130 */
4131 void MacroAssembler::kernel_crc32c(Register crc, Register buf, Register len,
4132 Register table0, Register table1, Register table2, Register table3,
4133 Register tmp, Register tmp2, Register tmp3) {
4134 if (UseCryptoPmullForCRC32) {
4135 kernel_crc32c_using_crypto_pmull(crc, buf, len, table0, table1, table2, table3);
4136 } else {
4137 kernel_crc32c_using_crc32c(crc, buf, len, table0, table1, table2, table3);
4138 }
4139 }
4140
4141 void MacroAssembler::kernel_crc32_common_fold_using_crypto_pmull(Register crc, Register buf,
4142 Register len, Register tmp0, Register tmp1, Register tmp2, size_t table_offset) {
4143 Label CRC_by128_loop;
4144 assert_different_registers(crc, buf, len, tmp0, tmp1, tmp2);
4145
4146 sub(len, len, 256);
4147 Register table = tmp0;
4148 {
4149 uint64_t offset;
4150 adrp(table, ExternalAddress(StubRoutines::crc_table_addr()), offset);
4151 add(table, table, offset);
4152 }
4153 add(table, table, table_offset);
4154
4155 sub(buf, buf, 0x10);
4156 ldrq(v1, Address(buf, 0x10));
4157 ldrq(v2, Address(buf, 0x20));
4158 ldrq(v3, Address(buf, 0x30));
4159 ldrq(v4, Address(buf, 0x40));
4160 ldrq(v5, Address(buf, 0x50));
4161 ldrq(v6, Address(buf, 0x60));
4162 ldrq(v7, Address(buf, 0x70));
4163 ldrq(v8, Address(pre(buf, 0x80)));
4164
4165 movi(v25, T4S, 0);
4166 mov(v25, S, 0, crc);
4167 eor(v1, T16B, v1, v25);
4168
4169 ldrq(v0, Address(table));
4170 b(CRC_by128_loop);
4171
4172 align(OptoLoopAlignment);
4173 BIND(CRC_by128_loop);
4174 pmull (v9, T1Q, v1, v0, T1D);
4175 pmull2(v10, T1Q, v1, v0, T2D);
4176 ldrq(v1, Address(buf, 0x10));
4177 eor3(v1, T16B, v9, v10, v1);
4178
4179 pmull (v11, T1Q, v2, v0, T1D);
4180 pmull2(v12, T1Q, v2, v0, T2D);
4181 ldrq(v2, Address(buf, 0x20));
4182 eor3(v2, T16B, v11, v12, v2);
4183
4184 pmull (v13, T1Q, v3, v0, T1D);
4185 pmull2(v14, T1Q, v3, v0, T2D);
4186 ldrq(v3, Address(buf, 0x30));
4187 eor3(v3, T16B, v13, v14, v3);
4188
4189 pmull (v15, T1Q, v4, v0, T1D);
4190 pmull2(v16, T1Q, v4, v0, T2D);
4191 ldrq(v4, Address(buf, 0x40));
4192 eor3(v4, T16B, v15, v16, v4);
4193
4194 pmull (v17, T1Q, v5, v0, T1D);
4195 pmull2(v18, T1Q, v5, v0, T2D);
4196 ldrq(v5, Address(buf, 0x50));
4197 eor3(v5, T16B, v17, v18, v5);
4198
4199 pmull (v19, T1Q, v6, v0, T1D);
4200 pmull2(v20, T1Q, v6, v0, T2D);
4201 ldrq(v6, Address(buf, 0x60));
4202 eor3(v6, T16B, v19, v20, v6);
4203
4204 pmull (v21, T1Q, v7, v0, T1D);
4205 pmull2(v22, T1Q, v7, v0, T2D);
4206 ldrq(v7, Address(buf, 0x70));
4207 eor3(v7, T16B, v21, v22, v7);
4208
4209 pmull (v23, T1Q, v8, v0, T1D);
4210 pmull2(v24, T1Q, v8, v0, T2D);
4211 ldrq(v8, Address(pre(buf, 0x80)));
4212 eor3(v8, T16B, v23, v24, v8);
4213
4214 subs(len, len, 0x80);
4215 br(Assembler::GE, CRC_by128_loop);
4216
4217 // fold into 512 bits
4218 ldrq(v0, Address(table, 0x10));
4219
4220 pmull (v10, T1Q, v1, v0, T1D);
4221 pmull2(v11, T1Q, v1, v0, T2D);
4222 eor3(v1, T16B, v10, v11, v5);
4223
4224 pmull (v12, T1Q, v2, v0, T1D);
4225 pmull2(v13, T1Q, v2, v0, T2D);
4226 eor3(v2, T16B, v12, v13, v6);
4227
4228 pmull (v14, T1Q, v3, v0, T1D);
4229 pmull2(v15, T1Q, v3, v0, T2D);
4230 eor3(v3, T16B, v14, v15, v7);
4231
4232 pmull (v16, T1Q, v4, v0, T1D);
4233 pmull2(v17, T1Q, v4, v0, T2D);
4234 eor3(v4, T16B, v16, v17, v8);
4235
4236 // fold into 128 bits
4237 ldrq(v5, Address(table, 0x20));
4238 pmull (v10, T1Q, v1, v5, T1D);
4239 pmull2(v11, T1Q, v1, v5, T2D);
4240 eor3(v4, T16B, v4, v10, v11);
4241
4242 ldrq(v6, Address(table, 0x30));
4243 pmull (v12, T1Q, v2, v6, T1D);
4244 pmull2(v13, T1Q, v2, v6, T2D);
4245 eor3(v4, T16B, v4, v12, v13);
4246
4247 ldrq(v7, Address(table, 0x40));
4248 pmull (v14, T1Q, v3, v7, T1D);
4249 pmull2(v15, T1Q, v3, v7, T2D);
4250 eor3(v1, T16B, v4, v14, v15);
4251
4252 add(len, len, 0x80);
4253 add(buf, buf, 0x10);
4254
4255 mov(tmp0, v1, D, 0);
4256 mov(tmp1, v1, D, 1);
4257 }
4258
4259 SkipIfEqual::SkipIfEqual(
4260 MacroAssembler* masm, const bool* flag_addr, bool value) {
4261 _masm = masm;
4262 uint64_t offset;
4263 _masm->adrp(rscratch1, ExternalAddress((address)flag_addr), offset);
4264 _masm->ldrb(rscratch1, Address(rscratch1, offset));
4265 if (value) {
4266 _masm->cbnzw(rscratch1, _label);
4267 } else {
4268 _masm->cbzw(rscratch1, _label);
4269 }
4270 }
4271
4272 SkipIfEqual::~SkipIfEqual() {
4273 _masm->bind(_label);
4274 }
4275
4276 void MacroAssembler::addptr(const Address &dst, int32_t src) {
4277 Address adr;
4278 switch(dst.getMode()) {
4279 case Address::base_plus_offset:
4280 // This is the expected mode, although we allow all the other
4281 // forms below.
4282 adr = form_address(rscratch2, dst.base(), dst.offset(), LogBytesPerWord);
4283 break;
4284 default:
4285 lea(rscratch2, dst);
4286 adr = Address(rscratch2);
4287 break;
4288 }
4289 ldr(rscratch1, adr);
4290 add(rscratch1, rscratch1, src);
4291 str(rscratch1, adr);
4292 }
4293
4294 void MacroAssembler::cmpptr(Register src1, Address src2) {
4295 uint64_t offset;
4296 adrp(rscratch1, src2, offset);
4297 ldr(rscratch1, Address(rscratch1, offset));
4298 cmp(src1, rscratch1);
4299 }
4300
4301 void MacroAssembler::cmpoop(Register obj1, Register obj2) {
4302 cmp(obj1, obj2);
4303 }
4304
4305 void MacroAssembler::load_method_holder_cld(Register rresult, Register rmethod) {
4306 load_method_holder(rresult, rmethod);
4307 ldr(rresult, Address(rresult, InstanceKlass::class_loader_data_offset()));
4308 }
4309
4310 void MacroAssembler::load_method_holder(Register holder, Register method) {
4311 ldr(holder, Address(method, Method::const_offset())); // ConstMethod*
4312 ldr(holder, Address(holder, ConstMethod::constants_offset())); // ConstantPool*
4313 ldr(holder, Address(holder, ConstantPool::pool_holder_offset())); // InstanceKlass*
4314 }
4315
4316 void MacroAssembler::load_klass(Register dst, Register src) {
4317 if (UseCompressedClassPointers) {
4318 ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
4319 decode_klass_not_null(dst);
4320 } else {
4321 ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));
4322 }
4323 }
4324
4325 // ((OopHandle)result).resolve();
4326 void MacroAssembler::resolve_oop_handle(Register result, Register tmp1, Register tmp2) {
4327 // OopHandle::resolve is an indirection.
4328 access_load_at(T_OBJECT, IN_NATIVE, result, Address(result, 0), tmp1, tmp2);
4329 }
4330
4331 // ((WeakHandle)result).resolve();
4332 void MacroAssembler::resolve_weak_handle(Register result, Register tmp1, Register tmp2) {
4333 assert_different_registers(result, tmp1, tmp2);
4334 Label resolved;
4335
4336 // A null weak handle resolves to null.
4337 cbz(result, resolved);
4338
4339 // Only 64 bit platforms support GCs that require a tmp register
4340 // WeakHandle::resolve is an indirection like jweak.
4341 access_load_at(T_OBJECT, IN_NATIVE | ON_PHANTOM_OOP_REF,
4342 result, Address(result), tmp1, tmp2);
4343 bind(resolved);
4344 }
4345
4346 void MacroAssembler::load_mirror(Register dst, Register method, Register tmp1, Register tmp2) {
4347 const int mirror_offset = in_bytes(Klass::java_mirror_offset());
4348 ldr(dst, Address(rmethod, Method::const_offset()));
4349 ldr(dst, Address(dst, ConstMethod::constants_offset()));
4350 ldr(dst, Address(dst, ConstantPool::pool_holder_offset()));
4351 ldr(dst, Address(dst, mirror_offset));
4352 resolve_oop_handle(dst, tmp1, tmp2);
4353 }
4354
4355 void MacroAssembler::cmp_klass(Register oop, Register trial_klass, Register tmp) {
4356 if (UseCompressedClassPointers) {
4357 ldrw(tmp, Address(oop, oopDesc::klass_offset_in_bytes()));
4358 if (CompressedKlassPointers::base() == nullptr) {
4359 cmp(trial_klass, tmp, LSL, CompressedKlassPointers::shift());
4360 return;
4361 } else if (((uint64_t)CompressedKlassPointers::base() & 0xffffffff) == 0
4362 && CompressedKlassPointers::shift() == 0) {
4363 // Only the bottom 32 bits matter
4364 cmpw(trial_klass, tmp);
4365 return;
4366 }
4367 decode_klass_not_null(tmp);
4368 } else {
4369 ldr(tmp, Address(oop, oopDesc::klass_offset_in_bytes()));
4370 }
4371 cmp(trial_klass, tmp);
4372 }
4373
4374 void MacroAssembler::store_klass(Register dst, Register src) {
4375 // FIXME: Should this be a store release? concurrent gcs assumes
4376 // klass length is valid if klass field is not null.
4377 if (UseCompressedClassPointers) {
4378 encode_klass_not_null(src);
4379 strw(src, Address(dst, oopDesc::klass_offset_in_bytes()));
4380 } else {
4381 str(src, Address(dst, oopDesc::klass_offset_in_bytes()));
4382 }
4383 }
4384
4385 void MacroAssembler::store_klass_gap(Register dst, Register src) {
4386 if (UseCompressedClassPointers) {
4387 // Store to klass gap in destination
4388 strw(src, Address(dst, oopDesc::klass_gap_offset_in_bytes()));
4389 }
4390 }
4391
4392 // Algorithm must match CompressedOops::encode.
4393 void MacroAssembler::encode_heap_oop(Register d, Register s) {
4394 #ifdef ASSERT
4395 verify_heapbase("MacroAssembler::encode_heap_oop: heap base corrupted?");
4396 #endif
4397 verify_oop_msg(s, "broken oop in encode_heap_oop");
4398 if (CompressedOops::base() == nullptr) {
4399 if (CompressedOops::shift() != 0) {
4400 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
4401 lsr(d, s, LogMinObjAlignmentInBytes);
4402 } else {
4403 mov(d, s);
4404 }
4405 } else {
4406 subs(d, s, rheapbase);
4407 csel(d, d, zr, Assembler::HS);
4408 lsr(d, d, LogMinObjAlignmentInBytes);
4409
4410 /* Old algorithm: is this any worse?
4411 Label nonnull;
4412 cbnz(r, nonnull);
4413 sub(r, r, rheapbase);
4414 bind(nonnull);
4415 lsr(r, r, LogMinObjAlignmentInBytes);
4416 */
4417 }
4418 }
4419
4420 void MacroAssembler::encode_heap_oop_not_null(Register r) {
4421 #ifdef ASSERT
4422 verify_heapbase("MacroAssembler::encode_heap_oop_not_null: heap base corrupted?");
4423 if (CheckCompressedOops) {
4424 Label ok;
4425 cbnz(r, ok);
4426 stop("null oop passed to encode_heap_oop_not_null");
4427 bind(ok);
4428 }
4429 #endif
4430 verify_oop_msg(r, "broken oop in encode_heap_oop_not_null");
4431 if (CompressedOops::base() != nullptr) {
4432 sub(r, r, rheapbase);
4433 }
4434 if (CompressedOops::shift() != 0) {
4435 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
4436 lsr(r, r, LogMinObjAlignmentInBytes);
4437 }
4438 }
4439
4440 void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) {
4441 #ifdef ASSERT
4442 verify_heapbase("MacroAssembler::encode_heap_oop_not_null2: heap base corrupted?");
4443 if (CheckCompressedOops) {
4444 Label ok;
4445 cbnz(src, ok);
4446 stop("null oop passed to encode_heap_oop_not_null2");
4447 bind(ok);
4448 }
4449 #endif
4450 verify_oop_msg(src, "broken oop in encode_heap_oop_not_null2");
4451
4452 Register data = src;
4453 if (CompressedOops::base() != nullptr) {
4454 sub(dst, src, rheapbase);
4455 data = dst;
4456 }
4457 if (CompressedOops::shift() != 0) {
4458 assert (LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
4459 lsr(dst, data, LogMinObjAlignmentInBytes);
4460 data = dst;
4461 }
4462 if (data == src)
4463 mov(dst, src);
4464 }
4465
4466 void MacroAssembler::decode_heap_oop(Register d, Register s) {
4467 #ifdef ASSERT
4468 verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?");
4469 #endif
4470 if (CompressedOops::base() == nullptr) {
4471 if (CompressedOops::shift() != 0 || d != s) {
4472 lsl(d, s, CompressedOops::shift());
4473 }
4474 } else {
4475 Label done;
4476 if (d != s)
4477 mov(d, s);
4478 cbz(s, done);
4479 add(d, rheapbase, s, Assembler::LSL, LogMinObjAlignmentInBytes);
4480 bind(done);
4481 }
4482 verify_oop_msg(d, "broken oop in decode_heap_oop");
4483 }
4484
4485 void MacroAssembler::decode_heap_oop_not_null(Register r) {
4486 assert (UseCompressedOops, "should only be used for compressed headers");
4487 assert (Universe::heap() != nullptr, "java heap should be initialized");
4488 // Cannot assert, unverified entry point counts instructions (see .ad file)
4489 // vtableStubs also counts instructions in pd_code_size_limit.
4490 // Also do not verify_oop as this is called by verify_oop.
4491 if (CompressedOops::shift() != 0) {
4492 assert(LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
4493 if (CompressedOops::base() != nullptr) {
4494 add(r, rheapbase, r, Assembler::LSL, LogMinObjAlignmentInBytes);
4495 } else {
4496 add(r, zr, r, Assembler::LSL, LogMinObjAlignmentInBytes);
4497 }
4498 } else {
4499 assert (CompressedOops::base() == nullptr, "sanity");
4500 }
4501 }
4502
4503 void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) {
4504 assert (UseCompressedOops, "should only be used for compressed headers");
4505 assert (Universe::heap() != nullptr, "java heap should be initialized");
4506 // Cannot assert, unverified entry point counts instructions (see .ad file)
4507 // vtableStubs also counts instructions in pd_code_size_limit.
4508 // Also do not verify_oop as this is called by verify_oop.
4509 if (CompressedOops::shift() != 0) {
4510 assert(LogMinObjAlignmentInBytes == CompressedOops::shift(), "decode alg wrong");
4511 if (CompressedOops::base() != nullptr) {
4512 add(dst, rheapbase, src, Assembler::LSL, LogMinObjAlignmentInBytes);
4513 } else {
4514 add(dst, zr, src, Assembler::LSL, LogMinObjAlignmentInBytes);
4515 }
4516 } else {
4517 assert (CompressedOops::base() == nullptr, "sanity");
4518 if (dst != src) {
4519 mov(dst, src);
4520 }
4521 }
4522 }
4523
4524 MacroAssembler::KlassDecodeMode MacroAssembler::_klass_decode_mode(KlassDecodeNone);
4525
4526 MacroAssembler::KlassDecodeMode MacroAssembler::klass_decode_mode() {
4527 assert(UseCompressedClassPointers, "not using compressed class pointers");
4528 assert(Metaspace::initialized(), "metaspace not initialized yet");
4529
4530 if (_klass_decode_mode != KlassDecodeNone) {
4531 return _klass_decode_mode;
4532 }
4533
4534 assert(LogKlassAlignmentInBytes == CompressedKlassPointers::shift()
4535 || 0 == CompressedKlassPointers::shift(), "decode alg wrong");
4536
4537 if (CompressedKlassPointers::base() == nullptr) {
4538 return (_klass_decode_mode = KlassDecodeZero);
4539 }
4540
4541 if (operand_valid_for_logical_immediate(
4542 /*is32*/false, (uint64_t)CompressedKlassPointers::base())) {
4543 const uint64_t range_mask =
4544 (1ULL << log2i(CompressedKlassPointers::range())) - 1;
4545 if (((uint64_t)CompressedKlassPointers::base() & range_mask) == 0) {
4546 return (_klass_decode_mode = KlassDecodeXor);
4547 }
4548 }
4549
4550 const uint64_t shifted_base =
4551 (uint64_t)CompressedKlassPointers::base() >> CompressedKlassPointers::shift();
4552 guarantee((shifted_base & 0xffff0000ffffffff) == 0,
4553 "compressed class base bad alignment");
4554
4555 return (_klass_decode_mode = KlassDecodeMovk);
4556 }
4557
4558 void MacroAssembler::encode_klass_not_null(Register dst, Register src) {
4559 switch (klass_decode_mode()) {
4560 case KlassDecodeZero:
4561 if (CompressedKlassPointers::shift() != 0) {
4562 lsr(dst, src, LogKlassAlignmentInBytes);
4563 } else {
4564 if (dst != src) mov(dst, src);
4565 }
4566 break;
4567
4568 case KlassDecodeXor:
4569 if (CompressedKlassPointers::shift() != 0) {
4570 eor(dst, src, (uint64_t)CompressedKlassPointers::base());
4571 lsr(dst, dst, LogKlassAlignmentInBytes);
4572 } else {
4573 eor(dst, src, (uint64_t)CompressedKlassPointers::base());
4574 }
4575 break;
4576
4577 case KlassDecodeMovk:
4578 if (CompressedKlassPointers::shift() != 0) {
4579 ubfx(dst, src, LogKlassAlignmentInBytes, 32);
4580 } else {
4581 movw(dst, src);
4582 }
4583 break;
4584
4585 case KlassDecodeNone:
4586 ShouldNotReachHere();
4587 break;
4588 }
4589 }
4590
4591 void MacroAssembler::encode_klass_not_null(Register r) {
4592 encode_klass_not_null(r, r);
4593 }
4594
4595 void MacroAssembler::decode_klass_not_null(Register dst, Register src) {
4596 assert (UseCompressedClassPointers, "should only be used for compressed headers");
4597
4598 switch (klass_decode_mode()) {
4599 case KlassDecodeZero:
4600 if (CompressedKlassPointers::shift() != 0) {
4601 lsl(dst, src, LogKlassAlignmentInBytes);
4602 } else {
4603 if (dst != src) mov(dst, src);
4604 }
4605 break;
4606
4607 case KlassDecodeXor:
4608 if (CompressedKlassPointers::shift() != 0) {
4609 lsl(dst, src, LogKlassAlignmentInBytes);
4610 eor(dst, dst, (uint64_t)CompressedKlassPointers::base());
4611 } else {
4612 eor(dst, src, (uint64_t)CompressedKlassPointers::base());
4613 }
4614 break;
4615
4616 case KlassDecodeMovk: {
4617 const uint64_t shifted_base =
4618 (uint64_t)CompressedKlassPointers::base() >> CompressedKlassPointers::shift();
4619
4620 if (dst != src) movw(dst, src);
4621 movk(dst, shifted_base >> 32, 32);
4622
4623 if (CompressedKlassPointers::shift() != 0) {
4624 lsl(dst, dst, LogKlassAlignmentInBytes);
4625 }
4626
4627 break;
4628 }
4629
4630 case KlassDecodeNone:
4631 ShouldNotReachHere();
4632 break;
4633 }
4634 }
4635
4636 void MacroAssembler::decode_klass_not_null(Register r) {
4637 decode_klass_not_null(r, r);
4638 }
4639
4640 void MacroAssembler::set_narrow_oop(Register dst, jobject obj) {
4641 #ifdef ASSERT
4642 {
4643 ThreadInVMfromUnknown tiv;
4644 assert (UseCompressedOops, "should only be used for compressed oops");
4645 assert (Universe::heap() != nullptr, "java heap should be initialized");
4646 assert (oop_recorder() != nullptr, "this assembler needs an OopRecorder");
4647 assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "should be real oop");
4648 }
4649 #endif
4650 int oop_index = oop_recorder()->find_index(obj);
4651 InstructionMark im(this);
4652 RelocationHolder rspec = oop_Relocation::spec(oop_index);
4653 code_section()->relocate(inst_mark(), rspec);
4654 movz(dst, 0xDEAD, 16);
4655 movk(dst, 0xBEEF);
4656 }
4657
4658 void MacroAssembler::set_narrow_klass(Register dst, Klass* k) {
4659 assert (UseCompressedClassPointers, "should only be used for compressed headers");
4660 assert (oop_recorder() != nullptr, "this assembler needs an OopRecorder");
4661 int index = oop_recorder()->find_index(k);
4662 assert(! Universe::heap()->is_in(k), "should not be an oop");
4663
4664 InstructionMark im(this);
4665 RelocationHolder rspec = metadata_Relocation::spec(index);
4666 code_section()->relocate(inst_mark(), rspec);
4667 narrowKlass nk = CompressedKlassPointers::encode(k);
4668 movz(dst, (nk >> 16), 16);
4669 movk(dst, nk & 0xffff);
4670 }
4671
4672 void MacroAssembler::access_load_at(BasicType type, DecoratorSet decorators,
4673 Register dst, Address src,
4674 Register tmp1, Register tmp2) {
4675 BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
4676 decorators = AccessInternal::decorator_fixup(decorators, type);
4677 bool as_raw = (decorators & AS_RAW) != 0;
4678 if (as_raw) {
4679 bs->BarrierSetAssembler::load_at(this, decorators, type, dst, src, tmp1, tmp2);
4680 } else {
4681 bs->load_at(this, decorators, type, dst, src, tmp1, tmp2);
4682 }
4683 }
4684
4685 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
4686 Address dst, Register val,
4687 Register tmp1, Register tmp2, Register tmp3) {
4688 BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
4689 decorators = AccessInternal::decorator_fixup(decorators, type);
4690 bool as_raw = (decorators & AS_RAW) != 0;
4691 if (as_raw) {
4692 bs->BarrierSetAssembler::store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
4693 } else {
4694 bs->store_at(this, decorators, type, dst, val, tmp1, tmp2, tmp3);
4695 }
4696 }
4697
4698 void MacroAssembler::load_heap_oop(Register dst, Address src, Register tmp1,
4699 Register tmp2, DecoratorSet decorators) {
4700 access_load_at(T_OBJECT, IN_HEAP | decorators, dst, src, tmp1, tmp2);
4701 }
4702
4703 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src, Register tmp1,
4704 Register tmp2, DecoratorSet decorators) {
4705 access_load_at(T_OBJECT, IN_HEAP | IS_NOT_NULL | decorators, dst, src, tmp1, tmp2);
4706 }
4707
4708 void MacroAssembler::store_heap_oop(Address dst, Register val, Register tmp1,
4709 Register tmp2, Register tmp3, DecoratorSet decorators) {
4710 access_store_at(T_OBJECT, IN_HEAP | decorators, dst, val, tmp1, tmp2, tmp3);
4711 }
4712
4713 // Used for storing nulls.
4714 void MacroAssembler::store_heap_oop_null(Address dst) {
4715 access_store_at(T_OBJECT, IN_HEAP, dst, noreg, noreg, noreg, noreg);
4716 }
4717
4718 Address MacroAssembler::allocate_metadata_address(Metadata* obj) {
4719 assert(oop_recorder() != nullptr, "this assembler needs a Recorder");
4720 int index = oop_recorder()->allocate_metadata_index(obj);
4721 RelocationHolder rspec = metadata_Relocation::spec(index);
4722 return Address((address)obj, rspec);
4723 }
4724
4725 // Move an oop into a register.
4726 void MacroAssembler::movoop(Register dst, jobject obj) {
4727 int oop_index;
4728 if (obj == nullptr) {
4729 oop_index = oop_recorder()->allocate_oop_index(obj);
4730 } else {
4731 #ifdef ASSERT
4732 {
4733 ThreadInVMfromUnknown tiv;
4734 assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "should be real oop");
4735 }
4736 #endif
4737 oop_index = oop_recorder()->find_index(obj);
4738 }
4739 RelocationHolder rspec = oop_Relocation::spec(oop_index);
4740
4741 if (BarrierSet::barrier_set()->barrier_set_assembler()->supports_instruction_patching()) {
4742 mov(dst, Address((address)obj, rspec));
4743 } else {
4744 address dummy = address(uintptr_t(pc()) & -wordSize); // A nearby aligned address
4745 ldr_constant(dst, Address(dummy, rspec));
4746 }
4747
4748 }
4749
4750 // Move a metadata address into a register.
4751 void MacroAssembler::mov_metadata(Register dst, Metadata* obj) {
4752 int oop_index;
4753 if (obj == nullptr) {
4754 oop_index = oop_recorder()->allocate_metadata_index(obj);
4755 } else {
4756 oop_index = oop_recorder()->find_index(obj);
4757 }
4758 RelocationHolder rspec = metadata_Relocation::spec(oop_index);
4759 mov(dst, Address((address)obj, rspec));
4760 }
4761
4762 Address MacroAssembler::constant_oop_address(jobject obj) {
4763 #ifdef ASSERT
4764 {
4765 ThreadInVMfromUnknown tiv;
4766 assert(oop_recorder() != nullptr, "this assembler needs an OopRecorder");
4767 assert(Universe::heap()->is_in(JNIHandles::resolve(obj)), "not an oop");
4768 }
4769 #endif
4770 int oop_index = oop_recorder()->find_index(obj);
4771 return Address((address)obj, oop_Relocation::spec(oop_index));
4772 }
4773
4774 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
4775 void MacroAssembler::tlab_allocate(Register obj,
4776 Register var_size_in_bytes,
4777 int con_size_in_bytes,
4778 Register t1,
4779 Register t2,
4780 Label& slow_case) {
4781 BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
4782 bs->tlab_allocate(this, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
4783 }
4784
4785 void MacroAssembler::verify_tlab() {
4786 #ifdef ASSERT
4787 if (UseTLAB && VerifyOops) {
4788 Label next, ok;
4789
4790 stp(rscratch2, rscratch1, Address(pre(sp, -16)));
4791
4792 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_top_offset())));
4793 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset())));
4794 cmp(rscratch2, rscratch1);
4795 br(Assembler::HS, next);
4796 STOP("assert(top >= start)");
4797 should_not_reach_here();
4798
4799 bind(next);
4800 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_end_offset())));
4801 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_top_offset())));
4802 cmp(rscratch2, rscratch1);
4803 br(Assembler::HS, ok);
4804 STOP("assert(top <= end)");
4805 should_not_reach_here();
4806
4807 bind(ok);
4808 ldp(rscratch2, rscratch1, Address(post(sp, 16)));
4809 }
4810 #endif
4811 }
4812
4813 // Writes to stack successive pages until offset reached to check for
4814 // stack overflow + shadow pages. This clobbers tmp.
4815 void MacroAssembler::bang_stack_size(Register size, Register tmp) {
4816 assert_different_registers(tmp, size, rscratch1);
4817 mov(tmp, sp);
4818 // Bang stack for total size given plus shadow page size.
4819 // Bang one page at a time because large size can bang beyond yellow and
4820 // red zones.
4821 Label loop;
4822 mov(rscratch1, (int)os::vm_page_size());
4823 bind(loop);
4824 lea(tmp, Address(tmp, -(int)os::vm_page_size()));
4825 subsw(size, size, rscratch1);
4826 str(size, Address(tmp));
4827 br(Assembler::GT, loop);
4828
4829 // Bang down shadow pages too.
4830 // At this point, (tmp-0) is the last address touched, so don't
4831 // touch it again. (It was touched as (tmp-pagesize) but then tmp
4832 // was post-decremented.) Skip this address by starting at i=1, and
4833 // touch a few more pages below. N.B. It is important to touch all
4834 // the way down to and including i=StackShadowPages.
4835 for (int i = 0; i < (int)(StackOverflow::stack_shadow_zone_size() / (int)os::vm_page_size()) - 1; i++) {
4836 // this could be any sized move but this is can be a debugging crumb
4837 // so the bigger the better.
4838 lea(tmp, Address(tmp, -(int)os::vm_page_size()));
4839 str(size, Address(tmp));
4840 }
4841 }
4842
4843 // Move the address of the polling page into dest.
4844 void MacroAssembler::get_polling_page(Register dest, relocInfo::relocType rtype) {
4845 ldr(dest, Address(rthread, JavaThread::polling_page_offset()));
4846 }
4847
4848 // Read the polling page. The address of the polling page must
4849 // already be in r.
4850 address MacroAssembler::read_polling_page(Register r, relocInfo::relocType rtype) {
4851 address mark;
4852 {
4853 InstructionMark im(this);
4854 code_section()->relocate(inst_mark(), rtype);
4855 ldrw(zr, Address(r, 0));
4856 mark = inst_mark();
4857 }
4858 verify_cross_modify_fence_not_required();
4859 return mark;
4860 }
4861
4862 void MacroAssembler::adrp(Register reg1, const Address &dest, uint64_t &byte_offset) {
4863 relocInfo::relocType rtype = dest.rspec().reloc()->type();
4864 uint64_t low_page = (uint64_t)CodeCache::low_bound() >> 12;
4865 uint64_t high_page = (uint64_t)(CodeCache::high_bound()-1) >> 12;
4866 uint64_t dest_page = (uint64_t)dest.target() >> 12;
4867 int64_t offset_low = dest_page - low_page;
4868 int64_t offset_high = dest_page - high_page;
4869
4870 assert(is_valid_AArch64_address(dest.target()), "bad address");
4871 assert(dest.getMode() == Address::literal, "ADRP must be applied to a literal address");
4872
4873 InstructionMark im(this);
4874 code_section()->relocate(inst_mark(), dest.rspec());
4875 // 8143067: Ensure that the adrp can reach the dest from anywhere within
4876 // the code cache so that if it is relocated we know it will still reach
4877 if (offset_high >= -(1<<20) && offset_low < (1<<20)) {
4878 _adrp(reg1, dest.target());
4879 } else {
4880 uint64_t target = (uint64_t)dest.target();
4881 uint64_t adrp_target
4882 = (target & 0xffffffffULL) | ((uint64_t)pc() & 0xffff00000000ULL);
4883
4884 _adrp(reg1, (address)adrp_target);
4885 movk(reg1, target >> 32, 32);
4886 }
4887 byte_offset = (uint64_t)dest.target() & 0xfff;
4888 }
4889
4890 void MacroAssembler::load_byte_map_base(Register reg) {
4891 CardTable::CardValue* byte_map_base =
4892 ((CardTableBarrierSet*)(BarrierSet::barrier_set()))->card_table()->byte_map_base();
4893
4894 // Strictly speaking the byte_map_base isn't an address at all, and it might
4895 // even be negative. It is thus materialised as a constant.
4896 mov(reg, (uint64_t)byte_map_base);
4897 }
4898
4899 void MacroAssembler::build_frame(int framesize) {
4900 assert(framesize >= 2 * wordSize, "framesize must include space for FP/LR");
4901 assert(framesize % (2*wordSize) == 0, "must preserve 2*wordSize alignment");
4902 protect_return_address();
4903 if (framesize < ((1 << 9) + 2 * wordSize)) {
4904 sub(sp, sp, framesize);
4905 stp(rfp, lr, Address(sp, framesize - 2 * wordSize));
4906 if (PreserveFramePointer) add(rfp, sp, framesize - 2 * wordSize);
4907 } else {
4908 stp(rfp, lr, Address(pre(sp, -2 * wordSize)));
4909 if (PreserveFramePointer) mov(rfp, sp);
4910 if (framesize < ((1 << 12) + 2 * wordSize))
4911 sub(sp, sp, framesize - 2 * wordSize);
4912 else {
4913 mov(rscratch1, framesize - 2 * wordSize);
4914 sub(sp, sp, rscratch1);
4915 }
4916 }
4917 verify_cross_modify_fence_not_required();
4918 }
4919
4920 void MacroAssembler::remove_frame(int framesize) {
4921 assert(framesize >= 2 * wordSize, "framesize must include space for FP/LR");
4922 assert(framesize % (2*wordSize) == 0, "must preserve 2*wordSize alignment");
4923 if (framesize < ((1 << 9) + 2 * wordSize)) {
4924 ldp(rfp, lr, Address(sp, framesize - 2 * wordSize));
4925 add(sp, sp, framesize);
4926 } else {
4927 if (framesize < ((1 << 12) + 2 * wordSize))
4928 add(sp, sp, framesize - 2 * wordSize);
4929 else {
4930 mov(rscratch1, framesize - 2 * wordSize);
4931 add(sp, sp, rscratch1);
4932 }
4933 ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
4934 }
4935 authenticate_return_address();
4936 }
4937
4938
4939 // This method counts leading positive bytes (highest bit not set) in provided byte array
4940 address MacroAssembler::count_positives(Register ary1, Register len, Register result) {
4941 // Simple and most common case of aligned small array which is not at the
4942 // end of memory page is placed here. All other cases are in stub.
4943 Label LOOP, END, STUB, STUB_LONG, SET_RESULT, DONE;
4944 const uint64_t UPPER_BIT_MASK=0x8080808080808080;
4945 assert_different_registers(ary1, len, result);
4946
4947 mov(result, len);
4948 cmpw(len, 0);
4949 br(LE, DONE);
4950 cmpw(len, 4 * wordSize);
4951 br(GE, STUB_LONG); // size > 32 then go to stub
4952
4953 int shift = 64 - exact_log2(os::vm_page_size());
4954 lsl(rscratch1, ary1, shift);
4955 mov(rscratch2, (size_t)(4 * wordSize) << shift);
4956 adds(rscratch2, rscratch1, rscratch2); // At end of page?
4957 br(CS, STUB); // at the end of page then go to stub
4958 subs(len, len, wordSize);
4959 br(LT, END);
4960
4961 BIND(LOOP);
4962 ldr(rscratch1, Address(post(ary1, wordSize)));
4963 tst(rscratch1, UPPER_BIT_MASK);
4964 br(NE, SET_RESULT);
4965 subs(len, len, wordSize);
4966 br(GE, LOOP);
4967 cmpw(len, -wordSize);
4968 br(EQ, DONE);
4969
4970 BIND(END);
4971 ldr(rscratch1, Address(ary1));
4972 sub(rscratch2, zr, len, LSL, 3); // LSL 3 is to get bits from bytes
4973 lslv(rscratch1, rscratch1, rscratch2);
4974 tst(rscratch1, UPPER_BIT_MASK);
4975 br(NE, SET_RESULT);
4976 b(DONE);
4977
4978 BIND(STUB);
4979 RuntimeAddress count_pos = RuntimeAddress(StubRoutines::aarch64::count_positives());
4980 assert(count_pos.target() != nullptr, "count_positives stub has not been generated");
4981 address tpc1 = trampoline_call(count_pos);
4982 if (tpc1 == nullptr) {
4983 DEBUG_ONLY(reset_labels(STUB_LONG, SET_RESULT, DONE));
4984 postcond(pc() == badAddress);
4985 return nullptr;
4986 }
4987 b(DONE);
4988
4989 BIND(STUB_LONG);
4990 RuntimeAddress count_pos_long = RuntimeAddress(StubRoutines::aarch64::count_positives_long());
4991 assert(count_pos_long.target() != nullptr, "count_positives_long stub has not been generated");
4992 address tpc2 = trampoline_call(count_pos_long);
4993 if (tpc2 == nullptr) {
4994 DEBUG_ONLY(reset_labels(SET_RESULT, DONE));
4995 postcond(pc() == badAddress);
4996 return nullptr;
4997 }
4998 b(DONE);
4999
5000 BIND(SET_RESULT);
5001
5002 add(len, len, wordSize);
5003 sub(result, result, len);
5004
5005 BIND(DONE);
5006 postcond(pc() != badAddress);
5007 return pc();
5008 }
5009
5010 // Clobbers: rscratch1, rscratch2, rflags
5011 // May also clobber v0-v7 when (!UseSimpleArrayEquals && UseSIMDForArrayEquals)
5012 address MacroAssembler::arrays_equals(Register a1, Register a2, Register tmp3,
5013 Register tmp4, Register tmp5, Register result,
5014 Register cnt1, int elem_size) {
5015 Label DONE, SAME;
5016 Register tmp1 = rscratch1;
5017 Register tmp2 = rscratch2;
5018 Register cnt2 = tmp2; // cnt2 only used in array length compare
5019 int elem_per_word = wordSize/elem_size;
5020 int log_elem_size = exact_log2(elem_size);
5021 int length_offset = arrayOopDesc::length_offset_in_bytes();
5022 int base_offset
5023 = arrayOopDesc::base_offset_in_bytes(elem_size == 2 ? T_CHAR : T_BYTE);
5024 int stubBytesThreshold = 3 * 64 + (UseSIMDForArrayEquals ? 0 : 16);
5025
5026 assert(elem_size == 1 || elem_size == 2, "must be char or byte");
5027 assert_different_registers(a1, a2, result, cnt1, rscratch1, rscratch2);
5028
5029 #ifndef PRODUCT
5030 {
5031 const char kind = (elem_size == 2) ? 'U' : 'L';
5032 char comment[64];
5033 snprintf(comment, sizeof comment, "array_equals%c{", kind);
5034 BLOCK_COMMENT(comment);
5035 }
5036 #endif
5037
5038 // if (a1 == a2)
5039 // return true;
5040 cmpoop(a1, a2); // May have read barriers for a1 and a2.
5041 br(EQ, SAME);
5042
5043 if (UseSimpleArrayEquals) {
5044 Label NEXT_WORD, SHORT, TAIL03, TAIL01, A_MIGHT_BE_NULL, A_IS_NOT_NULL;
5045 // if (a1 == nullptr || a2 == nullptr)
5046 // return false;
5047 // a1 & a2 == 0 means (some-pointer is null) or
5048 // (very-rare-or-even-probably-impossible-pointer-values)
5049 // so, we can save one branch in most cases
5050 tst(a1, a2);
5051 mov(result, false);
5052 br(EQ, A_MIGHT_BE_NULL);
5053 // if (a1.length != a2.length)
5054 // return false;
5055 bind(A_IS_NOT_NULL);
5056 ldrw(cnt1, Address(a1, length_offset));
5057 ldrw(cnt2, Address(a2, length_offset));
5058 eorw(tmp5, cnt1, cnt2);
5059 cbnzw(tmp5, DONE);
5060 lea(a1, Address(a1, base_offset));
5061 lea(a2, Address(a2, base_offset));
5062 // Check for short strings, i.e. smaller than wordSize.
5063 subs(cnt1, cnt1, elem_per_word);
5064 br(Assembler::LT, SHORT);
5065 // Main 8 byte comparison loop.
5066 bind(NEXT_WORD); {
5067 ldr(tmp1, Address(post(a1, wordSize)));
5068 ldr(tmp2, Address(post(a2, wordSize)));
5069 subs(cnt1, cnt1, elem_per_word);
5070 eor(tmp5, tmp1, tmp2);
5071 cbnz(tmp5, DONE);
5072 } br(GT, NEXT_WORD);
5073 // Last longword. In the case where length == 4 we compare the
5074 // same longword twice, but that's still faster than another
5075 // conditional branch.
5076 // cnt1 could be 0, -1, -2, -3, -4 for chars; -4 only happens when
5077 // length == 4.
5078 if (log_elem_size > 0)
5079 lsl(cnt1, cnt1, log_elem_size);
5080 ldr(tmp3, Address(a1, cnt1));
5081 ldr(tmp4, Address(a2, cnt1));
5082 eor(tmp5, tmp3, tmp4);
5083 cbnz(tmp5, DONE);
5084 b(SAME);
5085 bind(A_MIGHT_BE_NULL);
5086 // in case both a1 and a2 are not-null, proceed with loads
5087 cbz(a1, DONE);
5088 cbz(a2, DONE);
5089 b(A_IS_NOT_NULL);
5090 bind(SHORT);
5091
5092 tbz(cnt1, 2 - log_elem_size, TAIL03); // 0-7 bytes left.
5093 {
5094 ldrw(tmp1, Address(post(a1, 4)));
5095 ldrw(tmp2, Address(post(a2, 4)));
5096 eorw(tmp5, tmp1, tmp2);
5097 cbnzw(tmp5, DONE);
5098 }
5099 bind(TAIL03);
5100 tbz(cnt1, 1 - log_elem_size, TAIL01); // 0-3 bytes left.
5101 {
5102 ldrh(tmp3, Address(post(a1, 2)));
5103 ldrh(tmp4, Address(post(a2, 2)));
5104 eorw(tmp5, tmp3, tmp4);
5105 cbnzw(tmp5, DONE);
5106 }
5107 bind(TAIL01);
5108 if (elem_size == 1) { // Only needed when comparing byte arrays.
5109 tbz(cnt1, 0, SAME); // 0-1 bytes left.
5110 {
5111 ldrb(tmp1, a1);
5112 ldrb(tmp2, a2);
5113 eorw(tmp5, tmp1, tmp2);
5114 cbnzw(tmp5, DONE);
5115 }
5116 }
5117 } else {
5118 Label NEXT_DWORD, SHORT, TAIL, TAIL2, STUB,
5119 CSET_EQ, LAST_CHECK;
5120 mov(result, false);
5121 cbz(a1, DONE);
5122 ldrw(cnt1, Address(a1, length_offset));
5123 cbz(a2, DONE);
5124 ldrw(cnt2, Address(a2, length_offset));
5125 // on most CPUs a2 is still "locked"(surprisingly) in ldrw and it's
5126 // faster to perform another branch before comparing a1 and a2
5127 cmp(cnt1, (u1)elem_per_word);
5128 br(LE, SHORT); // short or same
5129 ldr(tmp3, Address(pre(a1, base_offset)));
5130 subs(zr, cnt1, stubBytesThreshold);
5131 br(GE, STUB);
5132 ldr(tmp4, Address(pre(a2, base_offset)));
5133 sub(tmp5, zr, cnt1, LSL, 3 + log_elem_size);
5134 cmp(cnt2, cnt1);
5135 br(NE, DONE);
5136
5137 // Main 16 byte comparison loop with 2 exits
5138 bind(NEXT_DWORD); {
5139 ldr(tmp1, Address(pre(a1, wordSize)));
5140 ldr(tmp2, Address(pre(a2, wordSize)));
5141 subs(cnt1, cnt1, 2 * elem_per_word);
5142 br(LE, TAIL);
5143 eor(tmp4, tmp3, tmp4);
5144 cbnz(tmp4, DONE);
5145 ldr(tmp3, Address(pre(a1, wordSize)));
5146 ldr(tmp4, Address(pre(a2, wordSize)));
5147 cmp(cnt1, (u1)elem_per_word);
5148 br(LE, TAIL2);
5149 cmp(tmp1, tmp2);
5150 } br(EQ, NEXT_DWORD);
5151 b(DONE);
5152
5153 bind(TAIL);
5154 eor(tmp4, tmp3, tmp4);
5155 eor(tmp2, tmp1, tmp2);
5156 lslv(tmp2, tmp2, tmp5);
5157 orr(tmp5, tmp4, tmp2);
5158 cmp(tmp5, zr);
5159 b(CSET_EQ);
5160
5161 bind(TAIL2);
5162 eor(tmp2, tmp1, tmp2);
5163 cbnz(tmp2, DONE);
5164 b(LAST_CHECK);
5165
5166 bind(STUB);
5167 ldr(tmp4, Address(pre(a2, base_offset)));
5168 cmp(cnt2, cnt1);
5169 br(NE, DONE);
5170 if (elem_size == 2) { // convert to byte counter
5171 lsl(cnt1, cnt1, 1);
5172 }
5173 eor(tmp5, tmp3, tmp4);
5174 cbnz(tmp5, DONE);
5175 RuntimeAddress stub = RuntimeAddress(StubRoutines::aarch64::large_array_equals());
5176 assert(stub.target() != nullptr, "array_equals_long stub has not been generated");
5177 address tpc = trampoline_call(stub);
5178 if (tpc == nullptr) {
5179 DEBUG_ONLY(reset_labels(SHORT, LAST_CHECK, CSET_EQ, SAME, DONE));
5180 postcond(pc() == badAddress);
5181 return nullptr;
5182 }
5183 b(DONE);
5184
5185 // (a1 != null && a2 == null) || (a1 != null && a2 != null && a1 == a2)
5186 // so, if a2 == null => return false(0), else return true, so we can return a2
5187 mov(result, a2);
5188 b(DONE);
5189 bind(SHORT);
5190 cmp(cnt2, cnt1);
5191 br(NE, DONE);
5192 cbz(cnt1, SAME);
5193 sub(tmp5, zr, cnt1, LSL, 3 + log_elem_size);
5194 ldr(tmp3, Address(a1, base_offset));
5195 ldr(tmp4, Address(a2, base_offset));
5196 bind(LAST_CHECK);
5197 eor(tmp4, tmp3, tmp4);
5198 lslv(tmp5, tmp4, tmp5);
5199 cmp(tmp5, zr);
5200 bind(CSET_EQ);
5201 cset(result, EQ);
5202 b(DONE);
5203 }
5204
5205 bind(SAME);
5206 mov(result, true);
5207 // That's it.
5208 bind(DONE);
5209
5210 BLOCK_COMMENT("} array_equals");
5211 postcond(pc() != badAddress);
5212 return pc();
5213 }
5214
5215 // Compare Strings
5216
5217 // For Strings we're passed the address of the first characters in a1
5218 // and a2 and the length in cnt1.
5219 // elem_size is the element size in bytes: either 1 or 2.
5220 // There are two implementations. For arrays >= 8 bytes, all
5221 // comparisons (including the final one, which may overlap) are
5222 // performed 8 bytes at a time. For strings < 8 bytes, we compare a
5223 // halfword, then a short, and then a byte.
5224
5225 void MacroAssembler::string_equals(Register a1, Register a2,
5226 Register result, Register cnt1, int elem_size)
5227 {
5228 Label SAME, DONE, SHORT, NEXT_WORD;
5229 Register tmp1 = rscratch1;
5230 Register tmp2 = rscratch2;
5231 Register cnt2 = tmp2; // cnt2 only used in array length compare
5232
5233 assert(elem_size == 1 || elem_size == 2, "must be 2 or 1 byte");
5234 assert_different_registers(a1, a2, result, cnt1, rscratch1, rscratch2);
5235
5236 #ifndef PRODUCT
5237 {
5238 const char kind = (elem_size == 2) ? 'U' : 'L';
5239 char comment[64];
5240 snprintf(comment, sizeof comment, "{string_equals%c", kind);
5241 BLOCK_COMMENT(comment);
5242 }
5243 #endif
5244
5245 mov(result, false);
5246
5247 // Check for short strings, i.e. smaller than wordSize.
5248 subs(cnt1, cnt1, wordSize);
5249 br(Assembler::LT, SHORT);
5250 // Main 8 byte comparison loop.
5251 bind(NEXT_WORD); {
5252 ldr(tmp1, Address(post(a1, wordSize)));
5253 ldr(tmp2, Address(post(a2, wordSize)));
5254 subs(cnt1, cnt1, wordSize);
5255 eor(tmp1, tmp1, tmp2);
5256 cbnz(tmp1, DONE);
5257 } br(GT, NEXT_WORD);
5258 // Last longword. In the case where length == 4 we compare the
5259 // same longword twice, but that's still faster than another
5260 // conditional branch.
5261 // cnt1 could be 0, -1, -2, -3, -4 for chars; -4 only happens when
5262 // length == 4.
5263 ldr(tmp1, Address(a1, cnt1));
5264 ldr(tmp2, Address(a2, cnt1));
5265 eor(tmp2, tmp1, tmp2);
5266 cbnz(tmp2, DONE);
5267 b(SAME);
5268
5269 bind(SHORT);
5270 Label TAIL03, TAIL01;
5271
5272 tbz(cnt1, 2, TAIL03); // 0-7 bytes left.
5273 {
5274 ldrw(tmp1, Address(post(a1, 4)));
5275 ldrw(tmp2, Address(post(a2, 4)));
5276 eorw(tmp1, tmp1, tmp2);
5277 cbnzw(tmp1, DONE);
5278 }
5279 bind(TAIL03);
5280 tbz(cnt1, 1, TAIL01); // 0-3 bytes left.
5281 {
5282 ldrh(tmp1, Address(post(a1, 2)));
5283 ldrh(tmp2, Address(post(a2, 2)));
5284 eorw(tmp1, tmp1, tmp2);
5285 cbnzw(tmp1, DONE);
5286 }
5287 bind(TAIL01);
5288 if (elem_size == 1) { // Only needed when comparing 1-byte elements
5289 tbz(cnt1, 0, SAME); // 0-1 bytes left.
5290 {
5291 ldrb(tmp1, a1);
5292 ldrb(tmp2, a2);
5293 eorw(tmp1, tmp1, tmp2);
5294 cbnzw(tmp1, DONE);
5295 }
5296 }
5297 // Arrays are equal.
5298 bind(SAME);
5299 mov(result, true);
5300
5301 // That's it.
5302 bind(DONE);
5303 BLOCK_COMMENT("} string_equals");
5304 }
5305
5306
5307 // The size of the blocks erased by the zero_blocks stub. We must
5308 // handle anything smaller than this ourselves in zero_words().
5309 const int MacroAssembler::zero_words_block_size = 8;
5310
5311 // zero_words() is used by C2 ClearArray patterns and by
5312 // C1_MacroAssembler. It is as small as possible, handling small word
5313 // counts locally and delegating anything larger to the zero_blocks
5314 // stub. It is expanded many times in compiled code, so it is
5315 // important to keep it short.
5316
5317 // ptr: Address of a buffer to be zeroed.
5318 // cnt: Count in HeapWords.
5319 //
5320 // ptr, cnt, rscratch1, and rscratch2 are clobbered.
5321 address MacroAssembler::zero_words(Register ptr, Register cnt)
5322 {
5323 assert(is_power_of_2(zero_words_block_size), "adjust this");
5324
5325 BLOCK_COMMENT("zero_words {");
5326 assert(ptr == r10 && cnt == r11, "mismatch in register usage");
5327 RuntimeAddress zero_blocks = RuntimeAddress(StubRoutines::aarch64::zero_blocks());
5328 assert(zero_blocks.target() != nullptr, "zero_blocks stub has not been generated");
5329
5330 subs(rscratch1, cnt, zero_words_block_size);
5331 Label around;
5332 br(LO, around);
5333 {
5334 RuntimeAddress zero_blocks = RuntimeAddress(StubRoutines::aarch64::zero_blocks());
5335 assert(zero_blocks.target() != nullptr, "zero_blocks stub has not been generated");
5336 // Make sure this is a C2 compilation. C1 allocates space only for
5337 // trampoline stubs generated by Call LIR ops, and in any case it
5338 // makes sense for a C1 compilation task to proceed as quickly as
5339 // possible.
5340 CompileTask* task;
5341 if (StubRoutines::aarch64::complete()
5342 && Thread::current()->is_Compiler_thread()
5343 && (task = ciEnv::current()->task())
5344 && is_c2_compile(task->comp_level())) {
5345 address tpc = trampoline_call(zero_blocks);
5346 if (tpc == nullptr) {
5347 DEBUG_ONLY(reset_labels(around));
5348 return nullptr;
5349 }
5350 } else {
5351 far_call(zero_blocks);
5352 }
5353 }
5354 bind(around);
5355
5356 // We have a few words left to do. zero_blocks has adjusted r10 and r11
5357 // for us.
5358 for (int i = zero_words_block_size >> 1; i > 1; i >>= 1) {
5359 Label l;
5360 tbz(cnt, exact_log2(i), l);
5361 for (int j = 0; j < i; j += 2) {
5362 stp(zr, zr, post(ptr, 2 * BytesPerWord));
5363 }
5364 bind(l);
5365 }
5366 {
5367 Label l;
5368 tbz(cnt, 0, l);
5369 str(zr, Address(ptr));
5370 bind(l);
5371 }
5372
5373 BLOCK_COMMENT("} zero_words");
5374 return pc();
5375 }
5376
5377 // base: Address of a buffer to be zeroed, 8 bytes aligned.
5378 // cnt: Immediate count in HeapWords.
5379 //
5380 // r10, r11, rscratch1, and rscratch2 are clobbered.
5381 address MacroAssembler::zero_words(Register base, uint64_t cnt)
5382 {
5383 assert(wordSize <= BlockZeroingLowLimit,
5384 "increase BlockZeroingLowLimit");
5385 address result = nullptr;
5386 if (cnt <= (uint64_t)BlockZeroingLowLimit / BytesPerWord) {
5387 #ifndef PRODUCT
5388 {
5389 char buf[64];
5390 snprintf(buf, sizeof buf, "zero_words (count = %" PRIu64 ") {", cnt);
5391 BLOCK_COMMENT(buf);
5392 }
5393 #endif
5394 if (cnt >= 16) {
5395 uint64_t loops = cnt/16;
5396 if (loops > 1) {
5397 mov(rscratch2, loops - 1);
5398 }
5399 {
5400 Label loop;
5401 bind(loop);
5402 for (int i = 0; i < 16; i += 2) {
5403 stp(zr, zr, Address(base, i * BytesPerWord));
5404 }
5405 add(base, base, 16 * BytesPerWord);
5406 if (loops > 1) {
5407 subs(rscratch2, rscratch2, 1);
5408 br(GE, loop);
5409 }
5410 }
5411 }
5412 cnt %= 16;
5413 int i = cnt & 1; // store any odd word to start
5414 if (i) str(zr, Address(base));
5415 for (; i < (int)cnt; i += 2) {
5416 stp(zr, zr, Address(base, i * wordSize));
5417 }
5418 BLOCK_COMMENT("} zero_words");
5419 result = pc();
5420 } else {
5421 mov(r10, base); mov(r11, cnt);
5422 result = zero_words(r10, r11);
5423 }
5424 return result;
5425 }
5426
5427 // Zero blocks of memory by using DC ZVA.
5428 //
5429 // Aligns the base address first sufficiently for DC ZVA, then uses
5430 // DC ZVA repeatedly for every full block. cnt is the size to be
5431 // zeroed in HeapWords. Returns the count of words left to be zeroed
5432 // in cnt.
5433 //
5434 // NOTE: This is intended to be used in the zero_blocks() stub. If
5435 // you want to use it elsewhere, note that cnt must be >= 2*zva_length.
5436 void MacroAssembler::zero_dcache_blocks(Register base, Register cnt) {
5437 Register tmp = rscratch1;
5438 Register tmp2 = rscratch2;
5439 int zva_length = VM_Version::zva_length();
5440 Label initial_table_end, loop_zva;
5441 Label fini;
5442
5443 // Base must be 16 byte aligned. If not just return and let caller handle it
5444 tst(base, 0x0f);
5445 br(Assembler::NE, fini);
5446 // Align base with ZVA length.
5447 neg(tmp, base);
5448 andr(tmp, tmp, zva_length - 1);
5449
5450 // tmp: the number of bytes to be filled to align the base with ZVA length.
5451 add(base, base, tmp);
5452 sub(cnt, cnt, tmp, Assembler::ASR, 3);
5453 adr(tmp2, initial_table_end);
5454 sub(tmp2, tmp2, tmp, Assembler::LSR, 2);
5455 br(tmp2);
5456
5457 for (int i = -zva_length + 16; i < 0; i += 16)
5458 stp(zr, zr, Address(base, i));
5459 bind(initial_table_end);
5460
5461 sub(cnt, cnt, zva_length >> 3);
5462 bind(loop_zva);
5463 dc(Assembler::ZVA, base);
5464 subs(cnt, cnt, zva_length >> 3);
5465 add(base, base, zva_length);
5466 br(Assembler::GE, loop_zva);
5467 add(cnt, cnt, zva_length >> 3); // count not zeroed by DC ZVA
5468 bind(fini);
5469 }
5470
5471 // base: Address of a buffer to be filled, 8 bytes aligned.
5472 // cnt: Count in 8-byte unit.
5473 // value: Value to be filled with.
5474 // base will point to the end of the buffer after filling.
5475 void MacroAssembler::fill_words(Register base, Register cnt, Register value)
5476 {
5477 // Algorithm:
5478 //
5479 // if (cnt == 0) {
5480 // return;
5481 // }
5482 // if ((p & 8) != 0) {
5483 // *p++ = v;
5484 // }
5485 //
5486 // scratch1 = cnt & 14;
5487 // cnt -= scratch1;
5488 // p += scratch1;
5489 // switch (scratch1 / 2) {
5490 // do {
5491 // cnt -= 16;
5492 // p[-16] = v;
5493 // p[-15] = v;
5494 // case 7:
5495 // p[-14] = v;
5496 // p[-13] = v;
5497 // case 6:
5498 // p[-12] = v;
5499 // p[-11] = v;
5500 // // ...
5501 // case 1:
5502 // p[-2] = v;
5503 // p[-1] = v;
5504 // case 0:
5505 // p += 16;
5506 // } while (cnt);
5507 // }
5508 // if ((cnt & 1) == 1) {
5509 // *p++ = v;
5510 // }
5511
5512 assert_different_registers(base, cnt, value, rscratch1, rscratch2);
5513
5514 Label fini, skip, entry, loop;
5515 const int unroll = 8; // Number of stp instructions we'll unroll
5516
5517 cbz(cnt, fini);
5518 tbz(base, 3, skip);
5519 str(value, Address(post(base, 8)));
5520 sub(cnt, cnt, 1);
5521 bind(skip);
5522
5523 andr(rscratch1, cnt, (unroll-1) * 2);
5524 sub(cnt, cnt, rscratch1);
5525 add(base, base, rscratch1, Assembler::LSL, 3);
5526 adr(rscratch2, entry);
5527 sub(rscratch2, rscratch2, rscratch1, Assembler::LSL, 1);
5528 br(rscratch2);
5529
5530 bind(loop);
5531 add(base, base, unroll * 16);
5532 for (int i = -unroll; i < 0; i++)
5533 stp(value, value, Address(base, i * 16));
5534 bind(entry);
5535 subs(cnt, cnt, unroll * 2);
5536 br(Assembler::GE, loop);
5537
5538 tbz(cnt, 0, fini);
5539 str(value, Address(post(base, 8)));
5540 bind(fini);
5541 }
5542
5543 // Intrinsic for
5544 //
5545 // - sun/nio/cs/ISO_8859_1$Encoder.implEncodeISOArray
5546 // return the number of characters copied.
5547 // - java/lang/StringUTF16.compress
5548 // return zero (0) if copy fails, otherwise 'len'.
5549 //
5550 // This version always returns the number of characters copied, and does not
5551 // clobber the 'len' register. A successful copy will complete with the post-
5552 // condition: 'res' == 'len', while an unsuccessful copy will exit with the
5553 // post-condition: 0 <= 'res' < 'len'.
5554 //
5555 // NOTE: Attempts to use 'ld2' (and 'umaxv' in the ISO part) has proven to
5556 // degrade performance (on Ampere Altra - Neoverse N1), to an extent
5557 // beyond the acceptable, even though the footprint would be smaller.
5558 // Using 'umaxv' in the ASCII-case comes with a small penalty but does
5559 // avoid additional bloat.
5560 //
5561 // Clobbers: src, dst, res, rscratch1, rscratch2, rflags
5562 void MacroAssembler::encode_iso_array(Register src, Register dst,
5563 Register len, Register res, bool ascii,
5564 FloatRegister vtmp0, FloatRegister vtmp1,
5565 FloatRegister vtmp2, FloatRegister vtmp3,
5566 FloatRegister vtmp4, FloatRegister vtmp5)
5567 {
5568 Register cnt = res;
5569 Register max = rscratch1;
5570 Register chk = rscratch2;
5571
5572 prfm(Address(src), PLDL1STRM);
5573 movw(cnt, len);
5574
5575 #define ASCII(insn) do { if (ascii) { insn; } } while (0)
5576
5577 Label LOOP_32, DONE_32, FAIL_32;
5578
5579 BIND(LOOP_32);
5580 {
5581 cmpw(cnt, 32);
5582 br(LT, DONE_32);
5583 ld1(vtmp0, vtmp1, vtmp2, vtmp3, T8H, Address(post(src, 64)));
5584 // Extract lower bytes.
5585 FloatRegister vlo0 = vtmp4;
5586 FloatRegister vlo1 = vtmp5;
5587 uzp1(vlo0, T16B, vtmp0, vtmp1);
5588 uzp1(vlo1, T16B, vtmp2, vtmp3);
5589 // Merge bits...
5590 orr(vtmp0, T16B, vtmp0, vtmp1);
5591 orr(vtmp2, T16B, vtmp2, vtmp3);
5592 // Extract merged upper bytes.
5593 FloatRegister vhix = vtmp0;
5594 uzp2(vhix, T16B, vtmp0, vtmp2);
5595 // ISO-check on hi-parts (all zero).
5596 // ASCII-check on lo-parts (no sign).
5597 FloatRegister vlox = vtmp1; // Merge lower bytes.
5598 ASCII(orr(vlox, T16B, vlo0, vlo1));
5599 umov(chk, vhix, D, 1); ASCII(cm(LT, vlox, T16B, vlox));
5600 fmovd(max, vhix); ASCII(umaxv(vlox, T16B, vlox));
5601 orr(chk, chk, max); ASCII(umov(max, vlox, B, 0));
5602 ASCII(orr(chk, chk, max));
5603 cbnz(chk, FAIL_32);
5604 subw(cnt, cnt, 32);
5605 st1(vlo0, vlo1, T16B, Address(post(dst, 32)));
5606 b(LOOP_32);
5607 }
5608 BIND(FAIL_32);
5609 sub(src, src, 64);
5610 BIND(DONE_32);
5611
5612 Label LOOP_8, SKIP_8;
5613
5614 BIND(LOOP_8);
5615 {
5616 cmpw(cnt, 8);
5617 br(LT, SKIP_8);
5618 FloatRegister vhi = vtmp0;
5619 FloatRegister vlo = vtmp1;
5620 ld1(vtmp3, T8H, src);
5621 uzp1(vlo, T16B, vtmp3, vtmp3);
5622 uzp2(vhi, T16B, vtmp3, vtmp3);
5623 // ISO-check on hi-parts (all zero).
5624 // ASCII-check on lo-parts (no sign).
5625 ASCII(cm(LT, vtmp2, T16B, vlo));
5626 fmovd(chk, vhi); ASCII(umaxv(vtmp2, T16B, vtmp2));
5627 ASCII(umov(max, vtmp2, B, 0));
5628 ASCII(orr(chk, chk, max));
5629 cbnz(chk, SKIP_8);
5630
5631 strd(vlo, Address(post(dst, 8)));
5632 subw(cnt, cnt, 8);
5633 add(src, src, 16);
5634 b(LOOP_8);
5635 }
5636 BIND(SKIP_8);
5637
5638 #undef ASCII
5639
5640 Label LOOP, DONE;
5641
5642 cbz(cnt, DONE);
5643 BIND(LOOP);
5644 {
5645 Register chr = rscratch1;
5646 ldrh(chr, Address(post(src, 2)));
5647 tst(chr, ascii ? 0xff80 : 0xff00);
5648 br(NE, DONE);
5649 strb(chr, Address(post(dst, 1)));
5650 subs(cnt, cnt, 1);
5651 br(GT, LOOP);
5652 }
5653 BIND(DONE);
5654 // Return index where we stopped.
5655 subw(res, len, cnt);
5656 }
5657
5658 // Inflate byte[] array to char[].
5659 // Clobbers: src, dst, len, rflags, rscratch1, v0-v6
5660 address MacroAssembler::byte_array_inflate(Register src, Register dst, Register len,
5661 FloatRegister vtmp1, FloatRegister vtmp2,
5662 FloatRegister vtmp3, Register tmp4) {
5663 Label big, done, after_init, to_stub;
5664
5665 assert_different_registers(src, dst, len, tmp4, rscratch1);
5666
5667 fmovd(vtmp1, 0.0);
5668 lsrw(tmp4, len, 3);
5669 bind(after_init);
5670 cbnzw(tmp4, big);
5671 // Short string: less than 8 bytes.
5672 {
5673 Label loop, tiny;
5674
5675 cmpw(len, 4);
5676 br(LT, tiny);
5677 // Use SIMD to do 4 bytes.
5678 ldrs(vtmp2, post(src, 4));
5679 zip1(vtmp3, T8B, vtmp2, vtmp1);
5680 subw(len, len, 4);
5681 strd(vtmp3, post(dst, 8));
5682
5683 cbzw(len, done);
5684
5685 // Do the remaining bytes by steam.
5686 bind(loop);
5687 ldrb(tmp4, post(src, 1));
5688 strh(tmp4, post(dst, 2));
5689 subw(len, len, 1);
5690
5691 bind(tiny);
5692 cbnz(len, loop);
5693
5694 b(done);
5695 }
5696
5697 if (SoftwarePrefetchHintDistance >= 0) {
5698 bind(to_stub);
5699 RuntimeAddress stub = RuntimeAddress(StubRoutines::aarch64::large_byte_array_inflate());
5700 assert(stub.target() != nullptr, "large_byte_array_inflate stub has not been generated");
5701 address tpc = trampoline_call(stub);
5702 if (tpc == nullptr) {
5703 DEBUG_ONLY(reset_labels(big, done));
5704 postcond(pc() == badAddress);
5705 return nullptr;
5706 }
5707 b(after_init);
5708 }
5709
5710 // Unpack the bytes 8 at a time.
5711 bind(big);
5712 {
5713 Label loop, around, loop_last, loop_start;
5714
5715 if (SoftwarePrefetchHintDistance >= 0) {
5716 const int large_loop_threshold = (64 + 16)/8;
5717 ldrd(vtmp2, post(src, 8));
5718 andw(len, len, 7);
5719 cmp(tmp4, (u1)large_loop_threshold);
5720 br(GE, to_stub);
5721 b(loop_start);
5722
5723 bind(loop);
5724 ldrd(vtmp2, post(src, 8));
5725 bind(loop_start);
5726 subs(tmp4, tmp4, 1);
5727 br(EQ, loop_last);
5728 zip1(vtmp2, T16B, vtmp2, vtmp1);
5729 ldrd(vtmp3, post(src, 8));
5730 st1(vtmp2, T8H, post(dst, 16));
5731 subs(tmp4, tmp4, 1);
5732 zip1(vtmp3, T16B, vtmp3, vtmp1);
5733 st1(vtmp3, T8H, post(dst, 16));
5734 br(NE, loop);
5735 b(around);
5736 bind(loop_last);
5737 zip1(vtmp2, T16B, vtmp2, vtmp1);
5738 st1(vtmp2, T8H, post(dst, 16));
5739 bind(around);
5740 cbz(len, done);
5741 } else {
5742 andw(len, len, 7);
5743 bind(loop);
5744 ldrd(vtmp2, post(src, 8));
5745 sub(tmp4, tmp4, 1);
5746 zip1(vtmp3, T16B, vtmp2, vtmp1);
5747 st1(vtmp3, T8H, post(dst, 16));
5748 cbnz(tmp4, loop);
5749 }
5750 }
5751
5752 // Do the tail of up to 8 bytes.
5753 add(src, src, len);
5754 ldrd(vtmp3, Address(src, -8));
5755 add(dst, dst, len, ext::uxtw, 1);
5756 zip1(vtmp3, T16B, vtmp3, vtmp1);
5757 strq(vtmp3, Address(dst, -16));
5758
5759 bind(done);
5760 postcond(pc() != badAddress);
5761 return pc();
5762 }
5763
5764 // Compress char[] array to byte[].
5765 void MacroAssembler::char_array_compress(Register src, Register dst, Register len,
5766 Register res,
5767 FloatRegister tmp0, FloatRegister tmp1,
5768 FloatRegister tmp2, FloatRegister tmp3,
5769 FloatRegister tmp4, FloatRegister tmp5) {
5770 encode_iso_array(src, dst, len, res, false, tmp0, tmp1, tmp2, tmp3, tmp4, tmp5);
5771 // Adjust result: res == len ? len : 0
5772 cmp(len, res);
5773 csel(res, res, zr, EQ);
5774 }
5775
5776 // java.math.round(double a)
5777 // Returns the closest long to the argument, with ties rounding to
5778 // positive infinity. This requires some fiddling for corner
5779 // cases. We take care to avoid double rounding in e.g. (jlong)(a + 0.5).
5780 void MacroAssembler::java_round_double(Register dst, FloatRegister src,
5781 FloatRegister ftmp) {
5782 Label DONE;
5783 BLOCK_COMMENT("java_round_double: { ");
5784 fmovd(rscratch1, src);
5785 // Use RoundToNearestTiesAway unless src small and -ve.
5786 fcvtasd(dst, src);
5787 // Test if src >= 0 || abs(src) >= 0x1.0p52
5788 eor(rscratch1, rscratch1, UCONST64(1) << 63); // flip sign bit
5789 mov(rscratch2, julong_cast(0x1.0p52));
5790 cmp(rscratch1, rscratch2);
5791 br(HS, DONE); {
5792 // src < 0 && abs(src) < 0x1.0p52
5793 // src may have a fractional part, so add 0.5
5794 fmovd(ftmp, 0.5);
5795 faddd(ftmp, src, ftmp);
5796 // Convert double to jlong, use RoundTowardsNegative
5797 fcvtmsd(dst, ftmp);
5798 }
5799 bind(DONE);
5800 BLOCK_COMMENT("} java_round_double");
5801 }
5802
5803 void MacroAssembler::java_round_float(Register dst, FloatRegister src,
5804 FloatRegister ftmp) {
5805 Label DONE;
5806 BLOCK_COMMENT("java_round_float: { ");
5807 fmovs(rscratch1, src);
5808 // Use RoundToNearestTiesAway unless src small and -ve.
5809 fcvtassw(dst, src);
5810 // Test if src >= 0 || abs(src) >= 0x1.0p23
5811 eor(rscratch1, rscratch1, 0x80000000); // flip sign bit
5812 mov(rscratch2, jint_cast(0x1.0p23f));
5813 cmp(rscratch1, rscratch2);
5814 br(HS, DONE); {
5815 // src < 0 && |src| < 0x1.0p23
5816 // src may have a fractional part, so add 0.5
5817 fmovs(ftmp, 0.5f);
5818 fadds(ftmp, src, ftmp);
5819 // Convert float to jint, use RoundTowardsNegative
5820 fcvtmssw(dst, ftmp);
5821 }
5822 bind(DONE);
5823 BLOCK_COMMENT("} java_round_float");
5824 }
5825
5826 // get_thread() can be called anywhere inside generated code so we
5827 // need to save whatever non-callee save context might get clobbered
5828 // by the call to JavaThread::aarch64_get_thread_helper() or, indeed,
5829 // the call setup code.
5830 //
5831 // On Linux, aarch64_get_thread_helper() clobbers only r0, r1, and flags.
5832 // On other systems, the helper is a usual C function.
5833 //
5834 void MacroAssembler::get_thread(Register dst) {
5835 RegSet saved_regs =
5836 LINUX_ONLY(RegSet::range(r0, r1) + lr - dst)
5837 NOT_LINUX (RegSet::range(r0, r17) + lr - dst);
5838
5839 protect_return_address();
5840 push(saved_regs, sp);
5841
5842 mov(lr, CAST_FROM_FN_PTR(address, JavaThread::aarch64_get_thread_helper));
5843 blr(lr);
5844 if (dst != c_rarg0) {
5845 mov(dst, c_rarg0);
5846 }
5847
5848 pop(saved_regs, sp);
5849 authenticate_return_address();
5850 }
5851
5852 void MacroAssembler::cache_wb(Address line) {
5853 assert(line.getMode() == Address::base_plus_offset, "mode should be base_plus_offset");
5854 assert(line.index() == noreg, "index should be noreg");
5855 assert(line.offset() == 0, "offset should be 0");
5856 // would like to assert this
5857 // assert(line._ext.shift == 0, "shift should be zero");
5858 if (VM_Version::supports_dcpop()) {
5859 // writeback using clear virtual address to point of persistence
5860 dc(Assembler::CVAP, line.base());
5861 } else {
5862 // no need to generate anything as Unsafe.writebackMemory should
5863 // never invoke this stub
5864 }
5865 }
5866
5867 void MacroAssembler::cache_wbsync(bool is_pre) {
5868 // we only need a barrier post sync
5869 if (!is_pre) {
5870 membar(Assembler::AnyAny);
5871 }
5872 }
5873
5874 void MacroAssembler::verify_sve_vector_length(Register tmp) {
5875 // Make sure that native code does not change SVE vector length.
5876 if (!UseSVE) return;
5877 Label verify_ok;
5878 movw(tmp, zr);
5879 sve_inc(tmp, B);
5880 subsw(zr, tmp, VM_Version::get_initial_sve_vector_length());
5881 br(EQ, verify_ok);
5882 stop("Error: SVE vector length has changed since jvm startup");
5883 bind(verify_ok);
5884 }
5885
5886 void MacroAssembler::verify_ptrue() {
5887 Label verify_ok;
5888 if (!UseSVE) {
5889 return;
5890 }
5891 sve_cntp(rscratch1, B, ptrue, ptrue); // get true elements count.
5892 sve_dec(rscratch1, B);
5893 cbz(rscratch1, verify_ok);
5894 stop("Error: the preserved predicate register (p7) elements are not all true");
5895 bind(verify_ok);
5896 }
5897
5898 void MacroAssembler::safepoint_isb() {
5899 isb();
5900 #ifndef PRODUCT
5901 if (VerifyCrossModifyFence) {
5902 // Clear the thread state.
5903 strb(zr, Address(rthread, in_bytes(JavaThread::requires_cross_modify_fence_offset())));
5904 }
5905 #endif
5906 }
5907
5908 #ifndef PRODUCT
5909 void MacroAssembler::verify_cross_modify_fence_not_required() {
5910 if (VerifyCrossModifyFence) {
5911 // Check if thread needs a cross modify fence.
5912 ldrb(rscratch1, Address(rthread, in_bytes(JavaThread::requires_cross_modify_fence_offset())));
5913 Label fence_not_required;
5914 cbz(rscratch1, fence_not_required);
5915 // If it does then fail.
5916 lea(rscratch1, CAST_FROM_FN_PTR(address, JavaThread::verify_cross_modify_fence_failure));
5917 mov(c_rarg0, rthread);
5918 blr(rscratch1);
5919 bind(fence_not_required);
5920 }
5921 }
5922 #endif
5923
5924 void MacroAssembler::spin_wait() {
5925 for (int i = 0; i < VM_Version::spin_wait_desc().inst_count(); ++i) {
5926 switch (VM_Version::spin_wait_desc().inst()) {
5927 case SpinWait::NOP:
5928 nop();
5929 break;
5930 case SpinWait::ISB:
5931 isb();
5932 break;
5933 case SpinWait::YIELD:
5934 yield();
5935 break;
5936 default:
5937 ShouldNotReachHere();
5938 }
5939 }
5940 }
5941
5942 // Stack frame creation/removal
5943
5944 void MacroAssembler::enter(bool strip_ret_addr) {
5945 if (strip_ret_addr) {
5946 // Addresses can only be signed once. If there are multiple nested frames being created
5947 // in the same function, then the return address needs stripping first.
5948 strip_return_address();
5949 }
5950 protect_return_address();
5951 stp(rfp, lr, Address(pre(sp, -2 * wordSize)));
5952 mov(rfp, sp);
5953 }
5954
5955 void MacroAssembler::leave() {
5956 mov(sp, rfp);
5957 ldp(rfp, lr, Address(post(sp, 2 * wordSize)));
5958 authenticate_return_address();
5959 }
5960
5961 // ROP Protection
5962 // Use the AArch64 PAC feature to add ROP protection for generated code. Use whenever creating/
5963 // destroying stack frames or whenever directly loading/storing the LR to memory.
5964 // If ROP protection is not set then these functions are no-ops.
5965 // For more details on PAC see pauth_aarch64.hpp.
5966
5967 // Sign the LR. Use during construction of a stack frame, before storing the LR to memory.
5968 // Uses the FP as the modifier.
5969 //
5970 void MacroAssembler::protect_return_address() {
5971 if (VM_Version::use_rop_protection()) {
5972 check_return_address();
5973 // The standard convention for C code is to use paciasp, which uses SP as the modifier. This
5974 // works because in C code, FP and SP match on function entry. In the JDK, SP and FP may not
5975 // match, so instead explicitly use the FP.
5976 pacia(lr, rfp);
5977 }
5978 }
5979
5980 // Sign the return value in the given register. Use before updating the LR in the existing stack
5981 // frame for the current function.
5982 // Uses the FP from the start of the function as the modifier - which is stored at the address of
5983 // the current FP.
5984 //
5985 void MacroAssembler::protect_return_address(Register return_reg, Register temp_reg) {
5986 if (VM_Version::use_rop_protection()) {
5987 assert(PreserveFramePointer, "PreserveFramePointer must be set for ROP protection");
5988 check_return_address(return_reg);
5989 ldr(temp_reg, Address(rfp));
5990 pacia(return_reg, temp_reg);
5991 }
5992 }
5993
5994 // Authenticate the LR. Use before function return, after restoring FP and loading LR from memory.
5995 //
5996 void MacroAssembler::authenticate_return_address(Register return_reg) {
5997 if (VM_Version::use_rop_protection()) {
5998 autia(return_reg, rfp);
5999 check_return_address(return_reg);
6000 }
6001 }
6002
6003 // Authenticate the return value in the given register. Use before updating the LR in the existing
6004 // stack frame for the current function.
6005 // Uses the FP from the start of the function as the modifier - which is stored at the address of
6006 // the current FP.
6007 //
6008 void MacroAssembler::authenticate_return_address(Register return_reg, Register temp_reg) {
6009 if (VM_Version::use_rop_protection()) {
6010 assert(PreserveFramePointer, "PreserveFramePointer must be set for ROP protection");
6011 ldr(temp_reg, Address(rfp));
6012 autia(return_reg, temp_reg);
6013 check_return_address(return_reg);
6014 }
6015 }
6016
6017 // Strip any PAC data from LR without performing any authentication. Use with caution - only if
6018 // there is no guaranteed way of authenticating the LR.
6019 //
6020 void MacroAssembler::strip_return_address() {
6021 if (VM_Version::use_rop_protection()) {
6022 xpaclri();
6023 }
6024 }
6025
6026 #ifndef PRODUCT
6027 // PAC failures can be difficult to debug. After an authentication failure, a segfault will only
6028 // occur when the pointer is used - ie when the program returns to the invalid LR. At this point
6029 // it is difficult to debug back to the callee function.
6030 // This function simply loads from the address in the given register.
6031 // Use directly after authentication to catch authentication failures.
6032 // Also use before signing to check that the pointer is valid and hasn't already been signed.
6033 //
6034 void MacroAssembler::check_return_address(Register return_reg) {
6035 if (VM_Version::use_rop_protection()) {
6036 ldr(zr, Address(return_reg));
6037 }
6038 }
6039 #endif
6040
6041 // The java_calling_convention describes stack locations as ideal slots on
6042 // a frame with no abi restrictions. Since we must observe abi restrictions
6043 // (like the placement of the register window) the slots must be biased by
6044 // the following value.
6045 static int reg2offset_in(VMReg r) {
6046 // Account for saved rfp and lr
6047 // This should really be in_preserve_stack_slots
6048 return (r->reg2stack() + 4) * VMRegImpl::stack_slot_size;
6049 }
6050
6051 static int reg2offset_out(VMReg r) {
6052 return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
6053 }
6054
6055 // On 64bit we will store integer like items to the stack as
6056 // 64bits items (AArch64 ABI) even though java would only store
6057 // 32bits for a parameter. On 32bit it will simply be 32bits
6058 // So this routine will do 32->32 on 32bit and 32->64 on 64bit
6059 void MacroAssembler::move32_64(VMRegPair src, VMRegPair dst, Register tmp) {
6060 if (src.first()->is_stack()) {
6061 if (dst.first()->is_stack()) {
6062 // stack to stack
6063 ldr(tmp, Address(rfp, reg2offset_in(src.first())));
6064 str(tmp, Address(sp, reg2offset_out(dst.first())));
6065 } else {
6066 // stack to reg
6067 ldrsw(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first())));
6068 }
6069 } else if (dst.first()->is_stack()) {
6070 // reg to stack
6071 str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first())));
6072 } else {
6073 if (dst.first() != src.first()) {
6074 sxtw(dst.first()->as_Register(), src.first()->as_Register());
6075 }
6076 }
6077 }
6078
6079 // An oop arg. Must pass a handle not the oop itself
6080 void MacroAssembler::object_move(
6081 OopMap* map,
6082 int oop_handle_offset,
6083 int framesize_in_slots,
6084 VMRegPair src,
6085 VMRegPair dst,
6086 bool is_receiver,
6087 int* receiver_offset) {
6088
6089 // must pass a handle. First figure out the location we use as a handle
6090
6091 Register rHandle = dst.first()->is_stack() ? rscratch2 : dst.first()->as_Register();
6092
6093 // See if oop is null if it is we need no handle
6094
6095 if (src.first()->is_stack()) {
6096
6097 // Oop is already on the stack as an argument
6098 int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots();
6099 map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots));
6100 if (is_receiver) {
6101 *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size;
6102 }
6103
6104 ldr(rscratch1, Address(rfp, reg2offset_in(src.first())));
6105 lea(rHandle, Address(rfp, reg2offset_in(src.first())));
6106 // conditionally move a null
6107 cmp(rscratch1, zr);
6108 csel(rHandle, zr, rHandle, Assembler::EQ);
6109 } else {
6110
6111 // Oop is in an a register we must store it to the space we reserve
6112 // on the stack for oop_handles and pass a handle if oop is non-null
6113
6114 const Register rOop = src.first()->as_Register();
6115 int oop_slot;
6116 if (rOop == j_rarg0)
6117 oop_slot = 0;
6118 else if (rOop == j_rarg1)
6119 oop_slot = 1;
6120 else if (rOop == j_rarg2)
6121 oop_slot = 2;
6122 else if (rOop == j_rarg3)
6123 oop_slot = 3;
6124 else if (rOop == j_rarg4)
6125 oop_slot = 4;
6126 else if (rOop == j_rarg5)
6127 oop_slot = 5;
6128 else if (rOop == j_rarg6)
6129 oop_slot = 6;
6130 else {
6131 assert(rOop == j_rarg7, "wrong register");
6132 oop_slot = 7;
6133 }
6134
6135 oop_slot = oop_slot * VMRegImpl::slots_per_word + oop_handle_offset;
6136 int offset = oop_slot*VMRegImpl::stack_slot_size;
6137
6138 map->set_oop(VMRegImpl::stack2reg(oop_slot));
6139 // Store oop in handle area, may be null
6140 str(rOop, Address(sp, offset));
6141 if (is_receiver) {
6142 *receiver_offset = offset;
6143 }
6144
6145 cmp(rOop, zr);
6146 lea(rHandle, Address(sp, offset));
6147 // conditionally move a null
6148 csel(rHandle, zr, rHandle, Assembler::EQ);
6149 }
6150
6151 // If arg is on the stack then place it otherwise it is already in correct reg.
6152 if (dst.first()->is_stack()) {
6153 str(rHandle, Address(sp, reg2offset_out(dst.first())));
6154 }
6155 }
6156
6157 // A float arg may have to do float reg int reg conversion
6158 void MacroAssembler::float_move(VMRegPair src, VMRegPair dst, Register tmp) {
6159 if (src.first()->is_stack()) {
6160 if (dst.first()->is_stack()) {
6161 ldrw(tmp, Address(rfp, reg2offset_in(src.first())));
6162 strw(tmp, Address(sp, reg2offset_out(dst.first())));
6163 } else {
6164 ldrs(dst.first()->as_FloatRegister(), Address(rfp, reg2offset_in(src.first())));
6165 }
6166 } else if (src.first() != dst.first()) {
6167 if (src.is_single_phys_reg() && dst.is_single_phys_reg())
6168 fmovs(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister());
6169 else
6170 strs(src.first()->as_FloatRegister(), Address(sp, reg2offset_out(dst.first())));
6171 }
6172 }
6173
6174 // A long move
6175 void MacroAssembler::long_move(VMRegPair src, VMRegPair dst, Register tmp) {
6176 if (src.first()->is_stack()) {
6177 if (dst.first()->is_stack()) {
6178 // stack to stack
6179 ldr(tmp, Address(rfp, reg2offset_in(src.first())));
6180 str(tmp, Address(sp, reg2offset_out(dst.first())));
6181 } else {
6182 // stack to reg
6183 ldr(dst.first()->as_Register(), Address(rfp, reg2offset_in(src.first())));
6184 }
6185 } else if (dst.first()->is_stack()) {
6186 // reg to stack
6187 // Do we really have to sign extend???
6188 // __ movslq(src.first()->as_Register(), src.first()->as_Register());
6189 str(src.first()->as_Register(), Address(sp, reg2offset_out(dst.first())));
6190 } else {
6191 if (dst.first() != src.first()) {
6192 mov(dst.first()->as_Register(), src.first()->as_Register());
6193 }
6194 }
6195 }
6196
6197
6198 // A double move
6199 void MacroAssembler::double_move(VMRegPair src, VMRegPair dst, Register tmp) {
6200 if (src.first()->is_stack()) {
6201 if (dst.first()->is_stack()) {
6202 ldr(tmp, Address(rfp, reg2offset_in(src.first())));
6203 str(tmp, Address(sp, reg2offset_out(dst.first())));
6204 } else {
6205 ldrd(dst.first()->as_FloatRegister(), Address(rfp, reg2offset_in(src.first())));
6206 }
6207 } else if (src.first() != dst.first()) {
6208 if (src.is_single_phys_reg() && dst.is_single_phys_reg())
6209 fmovd(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister());
6210 else
6211 strd(src.first()->as_FloatRegister(), Address(sp, reg2offset_out(dst.first())));
6212 }
6213 }
6214
6215 // Implements fast-locking.
6216 // Branches to slow upon failure to lock the object, with ZF cleared.
6217 // Falls through upon success with ZF set.
6218 //
6219 // - obj: the object to be locked
6220 // - hdr: the header, already loaded from obj, will be destroyed
6221 // - t1, t2: temporary registers, will be destroyed
6222 void MacroAssembler::fast_lock(Register obj, Register hdr, Register t1, Register t2, Label& slow) {
6223 assert(LockingMode == LM_LIGHTWEIGHT, "only used with new lightweight locking");
6224 assert_different_registers(obj, hdr, t1, t2);
6225
6226 // Check if we would have space on lock-stack for the object.
6227 ldrw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
6228 cmpw(t1, (unsigned)LockStack::end_offset() - 1);
6229 br(Assembler::GT, slow);
6230
6231 // Load (object->mark() | 1) into hdr
6232 orr(hdr, hdr, markWord::unlocked_value);
6233 // Clear lock-bits, into t2
6234 eor(t2, hdr, markWord::unlocked_value);
6235 // Try to swing header from unlocked to locked
6236 cmpxchg(/*addr*/ obj, /*expected*/ hdr, /*new*/ t2, Assembler::xword,
6237 /*acquire*/ true, /*release*/ true, /*weak*/ false, t1);
6238 br(Assembler::NE, slow);
6239
6240 // After successful lock, push object on lock-stack
6241 ldrw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
6242 str(obj, Address(rthread, t1));
6243 addw(t1, t1, oopSize);
6244 strw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
6245 }
6246
6247 // Implements fast-unlocking.
6248 // Branches to slow upon failure, with ZF cleared.
6249 // Falls through upon success, with ZF set.
6250 //
6251 // - obj: the object to be unlocked
6252 // - hdr: the (pre-loaded) header of the object
6253 // - t1, t2: temporary registers
6254 void MacroAssembler::fast_unlock(Register obj, Register hdr, Register t1, Register t2, Label& slow) {
6255 assert(LockingMode == LM_LIGHTWEIGHT, "only used with new lightweight locking");
6256 assert_different_registers(obj, hdr, t1, t2);
6257
6258 #ifdef ASSERT
6259 {
6260 // The following checks rely on the fact that LockStack is only ever modified by
6261 // its owning thread, even if the lock got inflated concurrently; removal of LockStack
6262 // entries after inflation will happen delayed in that case.
6263
6264 // Check for lock-stack underflow.
6265 Label stack_ok;
6266 ldrw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
6267 cmpw(t1, (unsigned)LockStack::start_offset());
6268 br(Assembler::GT, stack_ok);
6269 STOP("Lock-stack underflow");
6270 bind(stack_ok);
6271 }
6272 {
6273 // Check if the top of the lock-stack matches the unlocked object.
6274 Label tos_ok;
6275 subw(t1, t1, oopSize);
6276 ldr(t1, Address(rthread, t1));
6277 cmpoop(t1, obj);
6278 br(Assembler::EQ, tos_ok);
6279 STOP("Top of lock-stack does not match the unlocked object");
6280 bind(tos_ok);
6281 }
6282 {
6283 // Check that hdr is fast-locked.
6284 Label hdr_ok;
6285 tst(hdr, markWord::lock_mask_in_place);
6286 br(Assembler::EQ, hdr_ok);
6287 STOP("Header is not fast-locked");
6288 bind(hdr_ok);
6289 }
6290 #endif
6291
6292 // Load the new header (unlocked) into t1
6293 orr(t1, hdr, markWord::unlocked_value);
6294
6295 // Try to swing header from locked to unlocked
6296 cmpxchg(obj, hdr, t1, Assembler::xword,
6297 /*acquire*/ true, /*release*/ true, /*weak*/ false, t2);
6298 br(Assembler::NE, slow);
6299
6300 // After successful unlock, pop object from lock-stack
6301 ldrw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
6302 subw(t1, t1, oopSize);
6303 #ifdef ASSERT
6304 str(zr, Address(rthread, t1));
6305 #endif
6306 strw(t1, Address(rthread, JavaThread::lock_stack_top_offset()));
6307 }