1 // Copyright (c) 1994-2006 Sun Microsystems Inc.
2 // All Rights Reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // - Redistributions of source code must retain the above copyright notice,
9 // this list of conditions and the following disclaimer.
10 //
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.
14 //
15 // - Neither the name of Sun Microsystems or the names of contributors may
16 // be used to endorse or promote products derived from this software without
17 // specific prior written permission.
18 //
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.
30
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.
34
35 // A light-weight IA32 Assembler.
36
37 #ifndef V8_IA32_ASSEMBLER_IA32_INL_H_
38 #define V8_IA32_ASSEMBLER_IA32_INL_H_
39
40 #include "ia32/assembler-ia32.h"
41
42 #include "cpu.h"
43 #include "debug.h"
44
45 namespace v8 {
46 namespace internal {
47
48
49 // The modes possibly affected by apply must be in kApplyMask.
apply(intptr_t delta)50 void RelocInfo::apply(intptr_t delta) {
51 if (rmode_ == RUNTIME_ENTRY || IsCodeTarget(rmode_)) {
52 int32_t* p = reinterpret_cast<int32_t*>(pc_);
53 *p -= delta; // Relocate entry.
54 CPU::FlushICache(p, sizeof(uint32_t));
55 } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
56 // Special handling of js_return when a break point is set (call
57 // instruction has been inserted).
58 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
59 *p -= delta; // Relocate entry.
60 CPU::FlushICache(p, sizeof(uint32_t));
61 } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
62 // Special handling of a debug break slot when a break point is set (call
63 // instruction has been inserted).
64 int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
65 *p -= delta; // Relocate entry.
66 CPU::FlushICache(p, sizeof(uint32_t));
67 } else if (IsInternalReference(rmode_)) {
68 // absolute code pointer inside code object moves with the code object.
69 int32_t* p = reinterpret_cast<int32_t*>(pc_);
70 *p += delta; // Relocate entry.
71 CPU::FlushICache(p, sizeof(uint32_t));
72 }
73 }
74
75
target_address()76 Address RelocInfo::target_address() {
77 ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
78 return Assembler::target_address_at(pc_);
79 }
80
81
target_address_address()82 Address RelocInfo::target_address_address() {
83 ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY
84 || rmode_ == EMBEDDED_OBJECT
85 || rmode_ == EXTERNAL_REFERENCE);
86 return reinterpret_cast<Address>(pc_);
87 }
88
89
target_address_size()90 int RelocInfo::target_address_size() {
91 return Assembler::kSpecialTargetSize;
92 }
93
94
set_target_address(Address target,WriteBarrierMode mode)95 void RelocInfo::set_target_address(Address target, WriteBarrierMode mode) {
96 Assembler::set_target_address_at(pc_, target);
97 ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
98 if (mode == UPDATE_WRITE_BARRIER && host() != NULL && IsCodeTarget(rmode_)) {
99 Object* target_code = Code::GetCodeFromTargetAddress(target);
100 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
101 host(), this, HeapObject::cast(target_code));
102 }
103 }
104
105
target_object()106 Object* RelocInfo::target_object() {
107 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
108 return Memory::Object_at(pc_);
109 }
110
111
target_object_handle(Assembler * origin)112 Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
113 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
114 return Memory::Object_Handle_at(pc_);
115 }
116
117
target_object_address()118 Object** RelocInfo::target_object_address() {
119 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
120 return &Memory::Object_at(pc_);
121 }
122
123
set_target_object(Object * target,WriteBarrierMode mode)124 void RelocInfo::set_target_object(Object* target, WriteBarrierMode mode) {
125 ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
126 Memory::Object_at(pc_) = target;
127 CPU::FlushICache(pc_, sizeof(Address));
128 if (mode == UPDATE_WRITE_BARRIER &&
129 host() != NULL &&
130 target->IsHeapObject()) {
131 host()->GetHeap()->incremental_marking()->RecordWrite(
132 host(), &Memory::Object_at(pc_), HeapObject::cast(target));
133 }
134 }
135
136
target_reference_address()137 Address* RelocInfo::target_reference_address() {
138 ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
139 return reinterpret_cast<Address*>(pc_);
140 }
141
142
target_cell_handle()143 Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
144 ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
145 Address address = Memory::Address_at(pc_);
146 return Handle<JSGlobalPropertyCell>(
147 reinterpret_cast<JSGlobalPropertyCell**>(address));
148 }
149
150
target_cell()151 JSGlobalPropertyCell* RelocInfo::target_cell() {
152 ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
153 Address address = Memory::Address_at(pc_);
154 Object* object = HeapObject::FromAddress(
155 address - JSGlobalPropertyCell::kValueOffset);
156 return reinterpret_cast<JSGlobalPropertyCell*>(object);
157 }
158
159
set_target_cell(JSGlobalPropertyCell * cell,WriteBarrierMode mode)160 void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell,
161 WriteBarrierMode mode) {
162 ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
163 Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
164 Memory::Address_at(pc_) = address;
165 CPU::FlushICache(pc_, sizeof(Address));
166 if (mode == UPDATE_WRITE_BARRIER && host() != NULL) {
167 // TODO(1550) We are passing NULL as a slot because cell can never be on
168 // evacuation candidate.
169 host()->GetHeap()->incremental_marking()->RecordWrite(
170 host(), NULL, cell);
171 }
172 }
173
174
call_address()175 Address RelocInfo::call_address() {
176 ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
177 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
178 return Assembler::target_address_at(pc_ + 1);
179 }
180
181
set_call_address(Address target)182 void RelocInfo::set_call_address(Address target) {
183 ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
184 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
185 Assembler::set_target_address_at(pc_ + 1, target);
186 if (host() != NULL) {
187 Object* target_code = Code::GetCodeFromTargetAddress(target);
188 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
189 host(), this, HeapObject::cast(target_code));
190 }
191 }
192
193
call_object()194 Object* RelocInfo::call_object() {
195 return *call_object_address();
196 }
197
198
set_call_object(Object * target)199 void RelocInfo::set_call_object(Object* target) {
200 *call_object_address() = target;
201 }
202
203
call_object_address()204 Object** RelocInfo::call_object_address() {
205 ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
206 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
207 return reinterpret_cast<Object**>(pc_ + 1);
208 }
209
210
IsPatchedReturnSequence()211 bool RelocInfo::IsPatchedReturnSequence() {
212 return *pc_ == 0xE8;
213 }
214
215
IsPatchedDebugBreakSlotSequence()216 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
217 return !Assembler::IsNop(pc());
218 }
219
220
Visit(ObjectVisitor * visitor)221 void RelocInfo::Visit(ObjectVisitor* visitor) {
222 RelocInfo::Mode mode = rmode();
223 if (mode == RelocInfo::EMBEDDED_OBJECT) {
224 visitor->VisitEmbeddedPointer(this);
225 CPU::FlushICache(pc_, sizeof(Address));
226 } else if (RelocInfo::IsCodeTarget(mode)) {
227 visitor->VisitCodeTarget(this);
228 } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
229 visitor->VisitGlobalPropertyCell(this);
230 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
231 visitor->VisitExternalReference(this);
232 CPU::FlushICache(pc_, sizeof(Address));
233 #ifdef ENABLE_DEBUGGER_SUPPORT
234 // TODO(isolates): Get a cached isolate below.
235 } else if (((RelocInfo::IsJSReturn(mode) &&
236 IsPatchedReturnSequence()) ||
237 (RelocInfo::IsDebugBreakSlot(mode) &&
238 IsPatchedDebugBreakSlotSequence())) &&
239 Isolate::Current()->debug()->has_break_points()) {
240 visitor->VisitDebugTarget(this);
241 #endif
242 } else if (mode == RelocInfo::RUNTIME_ENTRY) {
243 visitor->VisitRuntimeEntry(this);
244 }
245 }
246
247
248 template<typename StaticVisitor>
Visit(Heap * heap)249 void RelocInfo::Visit(Heap* heap) {
250 RelocInfo::Mode mode = rmode();
251 if (mode == RelocInfo::EMBEDDED_OBJECT) {
252 StaticVisitor::VisitEmbeddedPointer(heap, this);
253 CPU::FlushICache(pc_, sizeof(Address));
254 } else if (RelocInfo::IsCodeTarget(mode)) {
255 StaticVisitor::VisitCodeTarget(heap, this);
256 } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
257 StaticVisitor::VisitGlobalPropertyCell(heap, this);
258 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
259 StaticVisitor::VisitExternalReference(this);
260 CPU::FlushICache(pc_, sizeof(Address));
261 #ifdef ENABLE_DEBUGGER_SUPPORT
262 } else if (heap->isolate()->debug()->has_break_points() &&
263 ((RelocInfo::IsJSReturn(mode) &&
264 IsPatchedReturnSequence()) ||
265 (RelocInfo::IsDebugBreakSlot(mode) &&
266 IsPatchedDebugBreakSlotSequence()))) {
267 StaticVisitor::VisitDebugTarget(heap, this);
268 #endif
269 } else if (mode == RelocInfo::RUNTIME_ENTRY) {
270 StaticVisitor::VisitRuntimeEntry(this);
271 }
272 }
273
274
275
Immediate(int x)276 Immediate::Immediate(int x) {
277 x_ = x;
278 rmode_ = RelocInfo::NONE;
279 }
280
281
Immediate(const ExternalReference & ext)282 Immediate::Immediate(const ExternalReference& ext) {
283 x_ = reinterpret_cast<int32_t>(ext.address());
284 rmode_ = RelocInfo::EXTERNAL_REFERENCE;
285 }
286
287
Immediate(Label * internal_offset)288 Immediate::Immediate(Label* internal_offset) {
289 x_ = reinterpret_cast<int32_t>(internal_offset);
290 rmode_ = RelocInfo::INTERNAL_REFERENCE;
291 }
292
293
Immediate(Handle<Object> handle)294 Immediate::Immediate(Handle<Object> handle) {
295 // Verify all Objects referred by code are NOT in new space.
296 Object* obj = *handle;
297 ASSERT(!HEAP->InNewSpace(obj));
298 if (obj->IsHeapObject()) {
299 x_ = reinterpret_cast<intptr_t>(handle.location());
300 rmode_ = RelocInfo::EMBEDDED_OBJECT;
301 } else {
302 // no relocation needed
303 x_ = reinterpret_cast<intptr_t>(obj);
304 rmode_ = RelocInfo::NONE;
305 }
306 }
307
308
Immediate(Smi * value)309 Immediate::Immediate(Smi* value) {
310 x_ = reinterpret_cast<intptr_t>(value);
311 rmode_ = RelocInfo::NONE;
312 }
313
314
Immediate(Address addr)315 Immediate::Immediate(Address addr) {
316 x_ = reinterpret_cast<int32_t>(addr);
317 rmode_ = RelocInfo::NONE;
318 }
319
320
emit(uint32_t x)321 void Assembler::emit(uint32_t x) {
322 *reinterpret_cast<uint32_t*>(pc_) = x;
323 pc_ += sizeof(uint32_t);
324 }
325
326
emit(Handle<Object> handle)327 void Assembler::emit(Handle<Object> handle) {
328 // Verify all Objects referred by code are NOT in new space.
329 Object* obj = *handle;
330 ASSERT(!isolate()->heap()->InNewSpace(obj));
331 if (obj->IsHeapObject()) {
332 emit(reinterpret_cast<intptr_t>(handle.location()),
333 RelocInfo::EMBEDDED_OBJECT);
334 } else {
335 // no relocation needed
336 emit(reinterpret_cast<intptr_t>(obj));
337 }
338 }
339
340
emit(uint32_t x,RelocInfo::Mode rmode,unsigned id)341 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, unsigned id) {
342 if (rmode == RelocInfo::CODE_TARGET && id != kNoASTId) {
343 RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, static_cast<intptr_t>(id));
344 } else if (rmode != RelocInfo::NONE) {
345 RecordRelocInfo(rmode);
346 }
347 emit(x);
348 }
349
350
emit(const Immediate & x)351 void Assembler::emit(const Immediate& x) {
352 if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
353 Label* label = reinterpret_cast<Label*>(x.x_);
354 emit_code_relative_offset(label);
355 return;
356 }
357 if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_);
358 emit(x.x_);
359 }
360
361
emit_code_relative_offset(Label * label)362 void Assembler::emit_code_relative_offset(Label* label) {
363 if (label->is_bound()) {
364 int32_t pos;
365 pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
366 emit(pos);
367 } else {
368 emit_disp(label, Displacement::CODE_RELATIVE);
369 }
370 }
371
372
emit_w(const Immediate & x)373 void Assembler::emit_w(const Immediate& x) {
374 ASSERT(x.rmode_ == RelocInfo::NONE);
375 uint16_t value = static_cast<uint16_t>(x.x_);
376 reinterpret_cast<uint16_t*>(pc_)[0] = value;
377 pc_ += sizeof(uint16_t);
378 }
379
380
target_address_at(Address pc)381 Address Assembler::target_address_at(Address pc) {
382 return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);
383 }
384
385
set_target_address_at(Address pc,Address target)386 void Assembler::set_target_address_at(Address pc, Address target) {
387 int32_t* p = reinterpret_cast<int32_t*>(pc);
388 *p = target - (pc + sizeof(int32_t));
389 CPU::FlushICache(p, sizeof(int32_t));
390 }
391
392
disp_at(Label * L)393 Displacement Assembler::disp_at(Label* L) {
394 return Displacement(long_at(L->pos()));
395 }
396
397
disp_at_put(Label * L,Displacement disp)398 void Assembler::disp_at_put(Label* L, Displacement disp) {
399 long_at_put(L->pos(), disp.data());
400 }
401
402
emit_disp(Label * L,Displacement::Type type)403 void Assembler::emit_disp(Label* L, Displacement::Type type) {
404 Displacement disp(L, type);
405 L->link_to(pc_offset());
406 emit(static_cast<int>(disp.data()));
407 }
408
409
emit_near_disp(Label * L)410 void Assembler::emit_near_disp(Label* L) {
411 byte disp = 0x00;
412 if (L->is_near_linked()) {
413 int offset = L->near_link_pos() - pc_offset();
414 ASSERT(is_int8(offset));
415 disp = static_cast<byte>(offset & 0xFF);
416 }
417 L->link_to(pc_offset(), Label::kNear);
418 *pc_++ = disp;
419 }
420
421
set_modrm(int mod,Register rm)422 void Operand::set_modrm(int mod, Register rm) {
423 ASSERT((mod & -4) == 0);
424 buf_[0] = mod << 6 | rm.code();
425 len_ = 1;
426 }
427
428
set_sib(ScaleFactor scale,Register index,Register base)429 void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
430 ASSERT(len_ == 1);
431 ASSERT((scale & -4) == 0);
432 // Use SIB with no index register only for base esp.
433 ASSERT(!index.is(esp) || base.is(esp));
434 buf_[1] = scale << 6 | index.code() << 3 | base.code();
435 len_ = 2;
436 }
437
438
set_disp8(int8_t disp)439 void Operand::set_disp8(int8_t disp) {
440 ASSERT(len_ == 1 || len_ == 2);
441 *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp;
442 }
443
444
set_dispr(int32_t disp,RelocInfo::Mode rmode)445 void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
446 ASSERT(len_ == 1 || len_ == 2);
447 int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
448 *p = disp;
449 len_ += sizeof(int32_t);
450 rmode_ = rmode;
451 }
452
Operand(Register reg)453 Operand::Operand(Register reg) {
454 // reg
455 set_modrm(3, reg);
456 }
457
458
Operand(XMMRegister xmm_reg)459 Operand::Operand(XMMRegister xmm_reg) {
460 Register reg = { xmm_reg.code() };
461 set_modrm(3, reg);
462 }
463
464
Operand(int32_t disp,RelocInfo::Mode rmode)465 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
466 // [disp/r]
467 set_modrm(0, ebp);
468 set_dispr(disp, rmode);
469 }
470
471 } } // namespace v8::internal
472
473 #endif // V8_IA32_ASSEMBLER_IA32_INL_H_
474