1 // Copyright (c) 1994-2006 Sun Microsystems Inc.
2 // All Rights Reserved.
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
8 // - Redistributions of source code must retain the above copyright notice,
9 // this list of conditions and the following disclaimer.
11 // - Redistribution in binary form must reproduce the above copyright
12 // notice, this list of conditions and the following disclaimer in the
13 // documentation and/or other materials provided with the distribution.
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16 // be used to endorse or promote products derived from this software without
17 // specific prior written permission.
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 // The original source code covered by the above license above has been
32 // modified significantly by Google Inc.
33 // Copyright 2012 the V8 project authors. All rights reserved.
35 // A light-weight IA32 Assembler.
37 #ifndef V8_X87_ASSEMBLER_X87_INL_H_
38 #define V8_X87_ASSEMBLER_X87_INL_H_
40 #include "src/x87/assembler-x87.h"
42 #include "src/assembler.h"
43 #include "src/debug.h"
48 bool CpuFeatures::SupportsCrankshaft() { return true; }
51 static const byte kCallOpcode = 0xE8;
52 static const int kNoCodeAgeSequenceLength = 5;
55 // The modes possibly affected by apply must be in kApplyMask.
56 void RelocInfo::apply(intptr_t delta, ICacheFlushMode icache_flush_mode) {
57 bool flush_icache = icache_flush_mode != SKIP_ICACHE_FLUSH;
58 if (IsRuntimeEntry(rmode_) || IsCodeTarget(rmode_)) {
59 int32_t* p = reinterpret_cast<int32_t*>(pc_);
60 *p -= delta; // Relocate entry.
61 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
62 } else if (rmode_ == CODE_AGE_SEQUENCE) {
63 if (*pc_ == kCallOpcode) {
64 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
65 *p -= delta; // Relocate entry.
66 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
68 } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
69 // Special handling of js_return when a break point is set (call
70 // instruction has been inserted).
71 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
72 *p -= delta; // Relocate entry.
73 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
74 } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
75 // Special handling of a debug break slot when a break point is set (call
76 // instruction has been inserted).
77 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
78 *p -= delta; // Relocate entry.
79 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
80 } else if (IsInternalReference(rmode_)) {
81 // absolute code pointer inside code object moves with the code object.
82 int32_t* p = reinterpret_cast<int32_t*>(pc_);
83 *p += delta; // Relocate entry.
84 if (flush_icache) CpuFeatures::FlushICache(p, sizeof(uint32_t));
89 Address RelocInfo::target_address() {
90 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
91 return Assembler::target_address_at(pc_, host_);
95 Address RelocInfo::target_address_address() {
96 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)
97 || rmode_ == EMBEDDED_OBJECT
98 || rmode_ == EXTERNAL_REFERENCE);
99 return reinterpret_cast<Address>(pc_);
103 Address RelocInfo::constant_pool_entry_address() {
109 int RelocInfo::target_address_size() {
110 return Assembler::kSpecialTargetSize;
114 void RelocInfo::set_target_address(Address target,
115 WriteBarrierMode write_barrier_mode,
116 ICacheFlushMode icache_flush_mode) {
117 Assembler::set_target_address_at(pc_, host_, target, icache_flush_mode);
118 Assembler::set_target_address_at(pc_, host_, target);
119 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
120 if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL &&
121 IsCodeTarget(rmode_)) {
122 Object* target_code = Code::GetCodeFromTargetAddress(target);
123 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
124 host(), this, HeapObject::cast(target_code));
129 Object* RelocInfo::target_object() {
130 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
131 return Memory::Object_at(pc_);
135 Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
136 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
137 return Memory::Object_Handle_at(pc_);
141 void RelocInfo::set_target_object(Object* target,
142 WriteBarrierMode write_barrier_mode,
143 ICacheFlushMode icache_flush_mode) {
144 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
145 Memory::Object_at(pc_) = target;
146 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
147 CpuFeatures::FlushICache(pc_, sizeof(Address));
149 if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
151 target->IsHeapObject()) {
152 host()->GetHeap()->incremental_marking()->RecordWrite(
153 host(), &Memory::Object_at(pc_), HeapObject::cast(target));
158 Address RelocInfo::target_external_reference() {
159 DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
160 return Memory::Address_at(pc_);
164 Address RelocInfo::target_internal_reference() {
165 DCHECK(rmode_ == INTERNAL_REFERENCE);
166 return Memory::Address_at(pc_);
170 Address RelocInfo::target_internal_reference_address() {
171 DCHECK(rmode_ == INTERNAL_REFERENCE);
172 return reinterpret_cast<Address>(pc_);
176 Address RelocInfo::target_runtime_entry(Assembler* origin) {
177 DCHECK(IsRuntimeEntry(rmode_));
178 return reinterpret_cast<Address>(*reinterpret_cast<int32_t*>(pc_));
182 void RelocInfo::set_target_runtime_entry(Address target,
183 WriteBarrierMode write_barrier_mode,
184 ICacheFlushMode icache_flush_mode) {
185 DCHECK(IsRuntimeEntry(rmode_));
186 if (target_address() != target) {
187 set_target_address(target, write_barrier_mode, icache_flush_mode);
192 Handle<Cell> RelocInfo::target_cell_handle() {
193 DCHECK(rmode_ == RelocInfo::CELL);
194 Address address = Memory::Address_at(pc_);
195 return Handle<Cell>(reinterpret_cast<Cell**>(address));
199 Cell* RelocInfo::target_cell() {
200 DCHECK(rmode_ == RelocInfo::CELL);
201 return Cell::FromValueAddress(Memory::Address_at(pc_));
205 void RelocInfo::set_target_cell(Cell* cell,
206 WriteBarrierMode write_barrier_mode,
207 ICacheFlushMode icache_flush_mode) {
208 DCHECK(rmode_ == RelocInfo::CELL);
209 Address address = cell->address() + Cell::kValueOffset;
210 Memory::Address_at(pc_) = address;
211 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
212 CpuFeatures::FlushICache(pc_, sizeof(Address));
214 if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL) {
215 // TODO(1550) We are passing NULL as a slot because cell can never be on
216 // evacuation candidate.
217 host()->GetHeap()->incremental_marking()->RecordWrite(
223 Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
224 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
225 DCHECK(*pc_ == kCallOpcode);
226 return Memory::Object_Handle_at(pc_ + 1);
230 Code* RelocInfo::code_age_stub() {
231 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
232 DCHECK(*pc_ == kCallOpcode);
233 return Code::GetCodeFromTargetAddress(
234 Assembler::target_address_at(pc_ + 1, host_));
238 void RelocInfo::set_code_age_stub(Code* stub,
239 ICacheFlushMode icache_flush_mode) {
240 DCHECK(*pc_ == kCallOpcode);
241 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
242 Assembler::set_target_address_at(pc_ + 1, host_, stub->instruction_start(),
247 Address RelocInfo::call_address() {
248 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
249 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
250 return Assembler::target_address_at(pc_ + 1, host_);
254 void RelocInfo::set_call_address(Address target) {
255 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
256 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
257 Assembler::set_target_address_at(pc_ + 1, host_, target);
258 if (host() != NULL) {
259 Object* target_code = Code::GetCodeFromTargetAddress(target);
260 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
261 host(), this, HeapObject::cast(target_code));
266 Object* RelocInfo::call_object() {
267 return *call_object_address();
271 void RelocInfo::set_call_object(Object* target) {
272 *call_object_address() = target;
276 Object** RelocInfo::call_object_address() {
277 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
278 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
279 return reinterpret_cast<Object**>(pc_ + 1);
283 void RelocInfo::WipeOut() {
284 if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_) ||
285 IsInternalReference(rmode_)) {
286 Memory::Address_at(pc_) = NULL;
287 } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
288 // Effectively write zero into the relocation.
289 Assembler::set_target_address_at(pc_, host_, pc_ + sizeof(int32_t));
296 bool RelocInfo::IsPatchedReturnSequence() {
297 return *pc_ == kCallOpcode;
301 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
302 return !Assembler::IsNop(pc());
306 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
307 RelocInfo::Mode mode = rmode();
308 if (mode == RelocInfo::EMBEDDED_OBJECT) {
309 visitor->VisitEmbeddedPointer(this);
310 CpuFeatures::FlushICache(pc_, sizeof(Address));
311 } else if (RelocInfo::IsCodeTarget(mode)) {
312 visitor->VisitCodeTarget(this);
313 } else if (mode == RelocInfo::CELL) {
314 visitor->VisitCell(this);
315 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
316 visitor->VisitExternalReference(this);
317 } else if (mode == RelocInfo::INTERNAL_REFERENCE) {
318 visitor->VisitInternalReference(this);
319 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
320 visitor->VisitCodeAgeSequence(this);
321 } else if (((RelocInfo::IsJSReturn(mode) &&
322 IsPatchedReturnSequence()) ||
323 (RelocInfo::IsDebugBreakSlot(mode) &&
324 IsPatchedDebugBreakSlotSequence())) &&
325 isolate->debug()->has_break_points()) {
326 visitor->VisitDebugTarget(this);
327 } else if (IsRuntimeEntry(mode)) {
328 visitor->VisitRuntimeEntry(this);
333 template<typename StaticVisitor>
334 void RelocInfo::Visit(Heap* heap) {
335 RelocInfo::Mode mode = rmode();
336 if (mode == RelocInfo::EMBEDDED_OBJECT) {
337 StaticVisitor::VisitEmbeddedPointer(heap, this);
338 CpuFeatures::FlushICache(pc_, sizeof(Address));
339 } else if (RelocInfo::IsCodeTarget(mode)) {
340 StaticVisitor::VisitCodeTarget(heap, this);
341 } else if (mode == RelocInfo::CELL) {
342 StaticVisitor::VisitCell(heap, this);
343 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
344 StaticVisitor::VisitExternalReference(this);
345 } else if (mode == RelocInfo::INTERNAL_REFERENCE) {
346 StaticVisitor::VisitInternalReference(this);
347 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
348 StaticVisitor::VisitCodeAgeSequence(heap, this);
349 } else if (heap->isolate()->debug()->has_break_points() &&
350 ((RelocInfo::IsJSReturn(mode) &&
351 IsPatchedReturnSequence()) ||
352 (RelocInfo::IsDebugBreakSlot(mode) &&
353 IsPatchedDebugBreakSlotSequence()))) {
354 StaticVisitor::VisitDebugTarget(heap, this);
355 } else if (IsRuntimeEntry(mode)) {
356 StaticVisitor::VisitRuntimeEntry(this);
362 Immediate::Immediate(int x) {
364 rmode_ = RelocInfo::NONE32;
368 Immediate::Immediate(const ExternalReference& ext) {
369 x_ = reinterpret_cast<int32_t>(ext.address());
370 rmode_ = RelocInfo::EXTERNAL_REFERENCE;
374 Immediate::Immediate(Label* internal_offset) {
375 x_ = reinterpret_cast<int32_t>(internal_offset);
376 rmode_ = RelocInfo::INTERNAL_REFERENCE;
380 Immediate::Immediate(Handle<Object> handle) {
381 AllowDeferredHandleDereference using_raw_address;
382 // Verify all Objects referred by code are NOT in new space.
383 Object* obj = *handle;
384 if (obj->IsHeapObject()) {
385 DCHECK(!HeapObject::cast(obj)->GetHeap()->InNewSpace(obj));
386 x_ = reinterpret_cast<intptr_t>(handle.location());
387 rmode_ = RelocInfo::EMBEDDED_OBJECT;
389 // no relocation needed
390 x_ = reinterpret_cast<intptr_t>(obj);
391 rmode_ = RelocInfo::NONE32;
396 Immediate::Immediate(Smi* value) {
397 x_ = reinterpret_cast<intptr_t>(value);
398 rmode_ = RelocInfo::NONE32;
402 Immediate::Immediate(Address addr) {
403 x_ = reinterpret_cast<int32_t>(addr);
404 rmode_ = RelocInfo::NONE32;
408 void Assembler::emit(uint32_t x) {
409 *reinterpret_cast<uint32_t*>(pc_) = x;
410 pc_ += sizeof(uint32_t);
414 void Assembler::emit(Handle<Object> handle) {
415 AllowDeferredHandleDereference heap_object_check;
416 // Verify all Objects referred by code are NOT in new space.
417 Object* obj = *handle;
418 DCHECK(!isolate()->heap()->InNewSpace(obj));
419 if (obj->IsHeapObject()) {
420 emit(reinterpret_cast<intptr_t>(handle.location()),
421 RelocInfo::EMBEDDED_OBJECT);
423 // no relocation needed
424 emit(reinterpret_cast<intptr_t>(obj));
429 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, TypeFeedbackId id) {
430 if (rmode == RelocInfo::CODE_TARGET && !id.IsNone()) {
431 RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, id.ToInt());
432 } else if (!RelocInfo::IsNone(rmode)
433 && rmode != RelocInfo::CODE_AGE_SEQUENCE) {
434 RecordRelocInfo(rmode);
440 void Assembler::emit(Handle<Code> code,
441 RelocInfo::Mode rmode,
443 AllowDeferredHandleDereference embedding_raw_address;
444 emit(reinterpret_cast<intptr_t>(code.location()), rmode, id);
448 void Assembler::emit(const Immediate& x) {
449 if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
450 Label* label = reinterpret_cast<Label*>(x.x_);
451 emit_code_relative_offset(label);
454 if (!RelocInfo::IsNone(x.rmode_)) RecordRelocInfo(x.rmode_);
459 void Assembler::emit_code_relative_offset(Label* label) {
460 if (label->is_bound()) {
462 pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
465 emit_disp(label, Displacement::CODE_RELATIVE);
470 void Assembler::emit_w(const Immediate& x) {
471 DCHECK(RelocInfo::IsNone(x.rmode_));
472 uint16_t value = static_cast<uint16_t>(x.x_);
473 reinterpret_cast<uint16_t*>(pc_)[0] = value;
474 pc_ += sizeof(uint16_t);
478 Address Assembler::target_address_at(Address pc,
479 ConstantPoolArray* constant_pool) {
480 return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);
484 void Assembler::set_target_address_at(Address pc,
485 ConstantPoolArray* constant_pool,
487 ICacheFlushMode icache_flush_mode) {
488 int32_t* p = reinterpret_cast<int32_t*>(pc);
489 *p = target - (pc + sizeof(int32_t));
490 if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
491 CpuFeatures::FlushICache(p, sizeof(int32_t));
496 Address Assembler::target_address_from_return_address(Address pc) {
497 return pc - kCallTargetAddressOffset;
501 Address Assembler::break_address_from_return_address(Address pc) {
502 return pc - Assembler::kPatchDebugBreakSlotReturnOffset;
506 Displacement Assembler::disp_at(Label* L) {
507 return Displacement(long_at(L->pos()));
511 void Assembler::disp_at_put(Label* L, Displacement disp) {
512 long_at_put(L->pos(), disp.data());
516 void Assembler::emit_disp(Label* L, Displacement::Type type) {
517 Displacement disp(L, type);
518 L->link_to(pc_offset());
519 emit(static_cast<int>(disp.data()));
523 void Assembler::emit_near_disp(Label* L) {
525 if (L->is_near_linked()) {
526 int offset = L->near_link_pos() - pc_offset();
527 DCHECK(is_int8(offset));
528 disp = static_cast<byte>(offset & 0xFF);
530 L->link_to(pc_offset(), Label::kNear);
535 void Assembler::deserialization_set_target_internal_reference_at(
536 Address pc, Address target, RelocInfo::Mode mode) {
537 Memory::Address_at(pc) = target;
541 void Operand::set_modrm(int mod, Register rm) {
542 DCHECK((mod & -4) == 0);
543 buf_[0] = mod << 6 | rm.code();
548 void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
550 DCHECK((scale & -4) == 0);
551 // Use SIB with no index register only for base esp.
552 DCHECK(!index.is(esp) || base.is(esp));
553 buf_[1] = scale << 6 | index.code() << 3 | base.code();
558 void Operand::set_disp8(int8_t disp) {
559 DCHECK(len_ == 1 || len_ == 2);
560 *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp;
564 void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
565 DCHECK(len_ == 1 || len_ == 2);
566 int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
568 len_ += sizeof(int32_t);
572 Operand::Operand(Register reg) {
578 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
581 set_dispr(disp, rmode);
585 Operand::Operand(Immediate imm) {
588 set_dispr(imm.x_, imm.rmode_);
590 } } // namespace v8::internal
592 #endif // V8_X87_ASSEMBLER_X87_INL_H_