1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef V8_X64_ASSEMBLER_X64_INL_H_
6 #define V8_X64_ASSEMBLER_X64_INL_H_
8 #include "src/x64/assembler-x64.h"
10 #include "src/base/cpu.h"
11 #include "src/debug.h"
12 #include "src/v8memory.h"
17 bool CpuFeatures::SupportsCrankshaft() { return true; }
18 bool CpuFeatures::SupportsSIMD128InCrankshaft() { return true; }
21 // -----------------------------------------------------------------------------
22 // Implementation of Assembler
25 static const byte kCallOpcode = 0xE8;
26 // The length of pushq(rbp), movp(rbp, rsp), Push(rsi) and Push(rdi).
27 static const int kNoCodeAgeSequenceLength = kPointerSize == kInt64Size ? 6 : 17;
30 void Assembler::emitl(uint32_t x) {
31 Memory::uint32_at(pc_) = x;
32 pc_ += sizeof(uint32_t);
36 void Assembler::emitp(void* x, RelocInfo::Mode rmode) {
37 uintptr_t value = reinterpret_cast<uintptr_t>(x);
38 Memory::uintptr_at(pc_) = value;
39 if (!RelocInfo::IsNone(rmode)) {
40 RecordRelocInfo(rmode, value);
42 pc_ += sizeof(uintptr_t);
46 void Assembler::emitq(uint64_t x) {
47 Memory::uint64_at(pc_) = x;
48 pc_ += sizeof(uint64_t);
52 void Assembler::emitw(uint16_t x) {
53 Memory::uint16_at(pc_) = x;
54 pc_ += sizeof(uint16_t);
58 void Assembler::emit_code_target(Handle<Code> target,
59 RelocInfo::Mode rmode,
60 TypeFeedbackId ast_id) {
61 DCHECK(RelocInfo::IsCodeTarget(rmode) ||
62 rmode == RelocInfo::CODE_AGE_SEQUENCE);
63 if (rmode == RelocInfo::CODE_TARGET && !ast_id.IsNone()) {
64 RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, ast_id.ToInt());
66 RecordRelocInfo(rmode);
68 int current = code_targets_.length();
69 if (current > 0 && code_targets_.last().is_identical_to(target)) {
70 // Optimization if we keep jumping to the same code target.
73 code_targets_.Add(target);
79 void Assembler::emit_runtime_entry(Address entry, RelocInfo::Mode rmode) {
80 DCHECK(RelocInfo::IsRuntimeEntry(rmode));
81 RecordRelocInfo(rmode);
82 emitl(static_cast<uint32_t>(entry - isolate()->code_range()->start()));
86 void Assembler::emit_rex_64(Register reg, Register rm_reg) {
87 emit(0x48 | reg.high_bit() << 2 | rm_reg.high_bit());
91 void Assembler::emit_rex_64(XMMRegister reg, Register rm_reg) {
92 emit(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
96 void Assembler::emit_rex_64(Register reg, XMMRegister rm_reg) {
97 emit(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
101 void Assembler::emit_rex_64(Register reg, const Operand& op) {
102 emit(0x48 | reg.high_bit() << 2 | op.rex_);
106 void Assembler::emit_rex_64(XMMRegister reg, const Operand& op) {
107 emit(0x48 | (reg.code() & 0x8) >> 1 | op.rex_);
111 void Assembler::emit_rex_64(Register rm_reg) {
112 DCHECK_EQ(rm_reg.code() & 0xf, rm_reg.code());
113 emit(0x48 | rm_reg.high_bit());
117 void Assembler::emit_rex_64(const Operand& op) {
118 emit(0x48 | op.rex_);
122 void Assembler::emit_rex_32(Register reg, Register rm_reg) {
123 emit(0x40 | reg.high_bit() << 2 | rm_reg.high_bit());
127 void Assembler::emit_rex_32(Register reg, const Operand& op) {
128 emit(0x40 | reg.high_bit() << 2 | op.rex_);
132 void Assembler::emit_rex_32(Register rm_reg) {
133 emit(0x40 | rm_reg.high_bit());
137 void Assembler::emit_rex_32(const Operand& op) {
138 emit(0x40 | op.rex_);
142 void Assembler::emit_optional_rex_32(Register reg, Register rm_reg) {
143 byte rex_bits = reg.high_bit() << 2 | rm_reg.high_bit();
144 if (rex_bits != 0) emit(0x40 | rex_bits);
148 void Assembler::emit_optional_rex_32(Register reg, const Operand& op) {
149 byte rex_bits = reg.high_bit() << 2 | op.rex_;
150 if (rex_bits != 0) emit(0x40 | rex_bits);
154 void Assembler::emit_optional_rex_32(XMMRegister reg, const Operand& op) {
155 byte rex_bits = (reg.code() & 0x8) >> 1 | op.rex_;
156 if (rex_bits != 0) emit(0x40 | rex_bits);
160 void Assembler::emit_optional_rex_32(XMMRegister reg, XMMRegister base) {
161 byte rex_bits = (reg.code() & 0x8) >> 1 | (base.code() & 0x8) >> 3;
162 if (rex_bits != 0) emit(0x40 | rex_bits);
166 void Assembler::emit_optional_rex_32(XMMRegister reg, Register base) {
167 byte rex_bits = (reg.code() & 0x8) >> 1 | (base.code() & 0x8) >> 3;
168 if (rex_bits != 0) emit(0x40 | rex_bits);
172 void Assembler::emit_optional_rex_32(Register reg, XMMRegister base) {
173 byte rex_bits = (reg.code() & 0x8) >> 1 | (base.code() & 0x8) >> 3;
174 if (rex_bits != 0) emit(0x40 | rex_bits);
178 void Assembler::emit_optional_rex_32(Register rm_reg) {
179 if (rm_reg.high_bit()) emit(0x41);
182 void Assembler::emit_optional_rex_32(XMMRegister reg) {
183 byte rex_bits = (reg.code() & 0x8) >> 1;
184 if (rex_bits != 0) emit(0x40 | rex_bits);
187 void Assembler::emit_optional_rex_32(const Operand& op) {
188 if (op.rex_ != 0) emit(0x40 | op.rex_);
192 Address Assembler::target_address_at(Address pc,
193 ConstantPoolArray* constant_pool) {
194 return Memory::int32_at(pc) + pc + 4;
198 void Assembler::set_target_address_at(Address pc,
199 ConstantPoolArray* constant_pool,
201 ICacheFlushMode icache_flush_mode) {
202 Memory::int32_at(pc) = static_cast<int32_t>(target - pc - 4);
203 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
204 CpuFeatures::FlushICache(pc, sizeof(int32_t));
209 Address Assembler::target_address_from_return_address(Address pc) {
210 return pc - kCallTargetAddressOffset;
214 Address Assembler::break_address_from_return_address(Address pc) {
215 return pc - Assembler::kPatchDebugBreakSlotReturnOffset;
219 Handle<Object> Assembler::code_target_object_handle_at(Address pc) {
220 return code_targets_[Memory::int32_at(pc)];
224 Address Assembler::runtime_entry_at(Address pc) {
225 return Memory::int32_at(pc) + isolate()->code_range()->start();
228 // -----------------------------------------------------------------------------
229 // Implementation of RelocInfo
231 // The modes possibly affected by apply must be in kApplyMask.
232 void RelocInfo::apply(intptr_t delta, ICacheFlushMode icache_flush_mode) {
233 bool flush_icache = icache_flush_mode != SKIP_ICACHE_FLUSH;
234 if (IsInternalReference(rmode_)) {
235 // absolute code pointer inside code object moves with the code object.
236 Memory::Address_at(pc_) += static_cast<int32_t>(delta);
237 if (flush_icache) CpuFeatures::FlushICache(pc_, sizeof(Address));
238 } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
239 Memory::int32_at(pc_) -= static_cast<int32_t>(delta);
240 if (flush_icache) CpuFeatures::FlushICache(pc_, sizeof(int32_t));
241 } else if (rmode_ == CODE_AGE_SEQUENCE) {
242 if (*pc_ == kCallOpcode) {
243 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
244 *p -= static_cast<int32_t>(delta); // Relocate entry.
245 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
251 Address RelocInfo::target_address() {
252 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
253 return Assembler::target_address_at(pc_, host_);
257 Address RelocInfo::target_address_address() {
258 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)
259 || rmode_ == EMBEDDED_OBJECT
260 || rmode_ == EXTERNAL_REFERENCE);
261 return reinterpret_cast<Address>(pc_);
265 Address RelocInfo::constant_pool_entry_address() {
271 int RelocInfo::target_address_size() {
272 if (IsCodedSpecially()) {
273 return Assembler::kSpecialTargetSize;
280 void RelocInfo::set_target_address(Address target,
281 WriteBarrierMode write_barrier_mode,
282 ICacheFlushMode icache_flush_mode) {
283 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
284 Assembler::set_target_address_at(pc_, host_, target, icache_flush_mode);
285 if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL &&
286 IsCodeTarget(rmode_)) {
287 Object* target_code = Code::GetCodeFromTargetAddress(target);
288 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
289 host(), this, HeapObject::cast(target_code));
294 Object* RelocInfo::target_object() {
295 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
296 return Memory::Object_at(pc_);
300 Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
301 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
302 if (rmode_ == EMBEDDED_OBJECT) {
303 return Memory::Object_Handle_at(pc_);
305 return origin->code_target_object_handle_at(pc_);
310 Address RelocInfo::target_reference() {
311 DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
312 return Memory::Address_at(pc_);
316 void RelocInfo::set_target_object(Object* target,
317 WriteBarrierMode write_barrier_mode,
318 ICacheFlushMode icache_flush_mode) {
319 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
320 Memory::Object_at(pc_) = target;
321 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
322 CpuFeatures::FlushICache(pc_, sizeof(Address));
324 if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
326 target->IsHeapObject()) {
327 host()->GetHeap()->incremental_marking()->RecordWrite(
328 host(), &Memory::Object_at(pc_), HeapObject::cast(target));
333 Address RelocInfo::target_runtime_entry(Assembler* origin) {
334 DCHECK(IsRuntimeEntry(rmode_));
335 return origin->runtime_entry_at(pc_);
339 void RelocInfo::set_target_runtime_entry(Address target,
340 WriteBarrierMode write_barrier_mode,
341 ICacheFlushMode icache_flush_mode) {
342 DCHECK(IsRuntimeEntry(rmode_));
343 if (target_address() != target) {
344 set_target_address(target, write_barrier_mode, icache_flush_mode);
349 Handle<Cell> RelocInfo::target_cell_handle() {
350 DCHECK(rmode_ == RelocInfo::CELL);
351 Address address = Memory::Address_at(pc_);
352 return Handle<Cell>(reinterpret_cast<Cell**>(address));
356 Cell* RelocInfo::target_cell() {
357 DCHECK(rmode_ == RelocInfo::CELL);
358 return Cell::FromValueAddress(Memory::Address_at(pc_));
362 void RelocInfo::set_target_cell(Cell* cell,
363 WriteBarrierMode write_barrier_mode,
364 ICacheFlushMode icache_flush_mode) {
365 DCHECK(rmode_ == RelocInfo::CELL);
366 Address address = cell->address() + Cell::kValueOffset;
367 Memory::Address_at(pc_) = address;
368 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
369 CpuFeatures::FlushICache(pc_, sizeof(Address));
371 if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
373 // TODO(1550) We are passing NULL as a slot because cell can never be on
374 // evacuation candidate.
375 host()->GetHeap()->incremental_marking()->RecordWrite(
381 void RelocInfo::WipeOut() {
382 if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_)) {
383 Memory::Address_at(pc_) = NULL;
384 } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
385 // Effectively write zero into the relocation.
386 Assembler::set_target_address_at(pc_, host_, pc_ + sizeof(int32_t));
393 bool RelocInfo::IsPatchedReturnSequence() {
394 // The recognized call sequence is:
395 // movq(kScratchRegister, address); call(kScratchRegister);
396 // It only needs to be distinguished from a return sequence
397 // movq(rsp, rbp); pop(rbp); ret(n); int3 *6
398 // The 11th byte is int3 (0xCC) in the return sequence and
399 // REX.WB (0x48+register bit) for the call sequence.
400 return pc_[Assembler::kMoveAddressIntoScratchRegisterInstructionLength] !=
405 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
406 return !Assembler::IsNop(pc());
410 Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
411 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
412 DCHECK(*pc_ == kCallOpcode);
413 return origin->code_target_object_handle_at(pc_ + 1);
417 Code* RelocInfo::code_age_stub() {
418 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
419 DCHECK(*pc_ == kCallOpcode);
420 return Code::GetCodeFromTargetAddress(
421 Assembler::target_address_at(pc_ + 1, host_));
425 void RelocInfo::set_code_age_stub(Code* stub,
426 ICacheFlushMode icache_flush_mode) {
427 DCHECK(*pc_ == kCallOpcode);
428 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
429 Assembler::set_target_address_at(pc_ + 1, host_, stub->instruction_start(),
434 Address RelocInfo::call_address() {
435 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
436 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
437 return Memory::Address_at(
438 pc_ + Assembler::kRealPatchReturnSequenceAddressOffset);
442 void RelocInfo::set_call_address(Address target) {
443 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
444 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
445 Memory::Address_at(pc_ + Assembler::kRealPatchReturnSequenceAddressOffset) =
447 CpuFeatures::FlushICache(
448 pc_ + Assembler::kRealPatchReturnSequenceAddressOffset, sizeof(Address));
449 if (host() != NULL) {
450 Object* target_code = Code::GetCodeFromTargetAddress(target);
451 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
452 host(), this, HeapObject::cast(target_code));
457 Object* RelocInfo::call_object() {
458 return *call_object_address();
462 void RelocInfo::set_call_object(Object* target) {
463 *call_object_address() = target;
467 Object** RelocInfo::call_object_address() {
468 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
469 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
470 return reinterpret_cast<Object**>(
471 pc_ + Assembler::kPatchReturnSequenceAddressOffset);
475 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
476 RelocInfo::Mode mode = rmode();
477 if (mode == RelocInfo::EMBEDDED_OBJECT) {
478 visitor->VisitEmbeddedPointer(this);
479 CpuFeatures::FlushICache(pc_, sizeof(Address));
480 } else if (RelocInfo::IsCodeTarget(mode)) {
481 visitor->VisitCodeTarget(this);
482 } else if (mode == RelocInfo::CELL) {
483 visitor->VisitCell(this);
484 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
485 visitor->VisitExternalReference(this);
486 CpuFeatures::FlushICache(pc_, sizeof(Address));
487 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
488 visitor->VisitCodeAgeSequence(this);
489 } else if (((RelocInfo::IsJSReturn(mode) &&
490 IsPatchedReturnSequence()) ||
491 (RelocInfo::IsDebugBreakSlot(mode) &&
492 IsPatchedDebugBreakSlotSequence())) &&
493 isolate->debug()->has_break_points()) {
494 visitor->VisitDebugTarget(this);
495 } else if (RelocInfo::IsRuntimeEntry(mode)) {
496 visitor->VisitRuntimeEntry(this);
501 template<typename StaticVisitor>
502 void RelocInfo::Visit(Heap* heap) {
503 RelocInfo::Mode mode = rmode();
504 if (mode == RelocInfo::EMBEDDED_OBJECT) {
505 StaticVisitor::VisitEmbeddedPointer(heap, this);
506 CpuFeatures::FlushICache(pc_, sizeof(Address));
507 } else if (RelocInfo::IsCodeTarget(mode)) {
508 StaticVisitor::VisitCodeTarget(heap, this);
509 } else if (mode == RelocInfo::CELL) {
510 StaticVisitor::VisitCell(heap, this);
511 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
512 StaticVisitor::VisitExternalReference(this);
513 CpuFeatures::FlushICache(pc_, sizeof(Address));
514 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
515 StaticVisitor::VisitCodeAgeSequence(heap, this);
516 } else if (heap->isolate()->debug()->has_break_points() &&
517 ((RelocInfo::IsJSReturn(mode) &&
518 IsPatchedReturnSequence()) ||
519 (RelocInfo::IsDebugBreakSlot(mode) &&
520 IsPatchedDebugBreakSlotSequence()))) {
521 StaticVisitor::VisitDebugTarget(heap, this);
522 } else if (RelocInfo::IsRuntimeEntry(mode)) {
523 StaticVisitor::VisitRuntimeEntry(this);
528 // -----------------------------------------------------------------------------
529 // Implementation of Operand
531 void Operand::set_modrm(int mod, Register rm_reg) {
532 DCHECK(is_uint2(mod));
533 buf_[0] = mod << 6 | rm_reg.low_bits();
534 // Set REX.B to the high bit of rm.code().
535 rex_ |= rm_reg.high_bit();
539 void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
541 DCHECK(is_uint2(scale));
542 // Use SIB with no index register only for base rsp or r12. Otherwise we
543 // would skip the SIB byte entirely.
544 DCHECK(!index.is(rsp) || base.is(rsp) || base.is(r12));
545 buf_[1] = (scale << 6) | (index.low_bits() << 3) | base.low_bits();
546 rex_ |= index.high_bit() << 1 | base.high_bit();
550 void Operand::set_disp8(int disp) {
551 DCHECK(is_int8(disp));
552 DCHECK(len_ == 1 || len_ == 2);
553 int8_t* p = reinterpret_cast<int8_t*>(&buf_[len_]);
555 len_ += sizeof(int8_t);
558 void Operand::set_disp32(int disp) {
559 DCHECK(len_ == 1 || len_ == 2);
560 int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
562 len_ += sizeof(int32_t);
566 } } // namespace v8::internal
568 #endif // V8_X64_ASSEMBLER_X64_INL_H_