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