2 // Copyright (c) 1994-2006 Sun Microsystems Inc.
3 // All Rights Reserved.
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
9 // - Redistributions of source code must retain the above copyright notice,
10 // this list of conditions and the following disclaimer.
12 // - Redistribution in binary form must reproduce the above copyright
13 // notice, this list of conditions and the following disclaimer in the
14 // documentation and/or other materials provided with the distribution.
16 // - Neither the name of Sun Microsystems or the names of contributors may
17 // be used to endorse or promote products derived from this software without
18 // specific prior written permission.
20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
21 // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 // The original source code covered by the above license above has been
33 // modified significantly by Google Inc.
34 // Copyright 2012 the V8 project authors. All rights reserved.
37 #ifndef V8_MIPS_ASSEMBLER_MIPS_INL_H_
38 #define V8_MIPS_ASSEMBLER_MIPS_INL_H_
40 #include "src/mips/assembler-mips.h"
42 #include "src/assembler.h"
43 #include "src/debug.h"
50 bool CpuFeatures::SupportsCrankshaft() { return IsSupported(FPU); }
51 bool CpuFeatures::SupportsSIMD128InCrankshaft() { return false; }
54 // -----------------------------------------------------------------------------
55 // Operand and MemOperand.
57 Operand::Operand(int32_t immediate, RelocInfo::Mode rmode) {
64 Operand::Operand(const ExternalReference& f) {
66 imm32_ = reinterpret_cast<int32_t>(f.address());
67 rmode_ = RelocInfo::EXTERNAL_REFERENCE;
71 Operand::Operand(Smi* value) {
73 imm32_ = reinterpret_cast<intptr_t>(value);
74 rmode_ = RelocInfo::NONE32;
78 Operand::Operand(Register rm) {
83 bool Operand::is_reg() const {
84 return rm_.is_valid();
88 int Register::NumAllocatableRegisters() {
89 return kMaxNumAllocatableRegisters;
93 int DoubleRegister::NumRegisters() {
94 return FPURegister::kMaxNumRegisters;
98 int DoubleRegister::NumAllocatableRegisters() {
99 return FPURegister::kMaxNumAllocatableRegisters;
103 int FPURegister::ToAllocationIndex(FPURegister reg) {
104 DCHECK(reg.code() % 2 == 0);
105 DCHECK(reg.code() / 2 < kMaxNumAllocatableRegisters);
106 DCHECK(reg.is_valid());
107 DCHECK(!reg.is(kDoubleRegZero));
108 DCHECK(!reg.is(kLithiumScratchDouble));
109 return (reg.code() / 2);
113 // -----------------------------------------------------------------------------
116 void RelocInfo::apply(intptr_t delta, ICacheFlushMode icache_flush_mode) {
117 if (IsCodeTarget(rmode_)) {
118 uint32_t scope1 = (uint32_t) target_address() & ~kImm28Mask;
119 uint32_t scope2 = reinterpret_cast<uint32_t>(pc_) & ~kImm28Mask;
121 if (scope1 != scope2) {
122 Assembler::JumpLabelToJumpRegister(pc_);
125 if (IsInternalReference(rmode_)) {
126 // Absolute code pointer inside code object moves with the code object.
127 byte* p = reinterpret_cast<byte*>(pc_);
128 int count = Assembler::RelocateInternalReference(p, delta);
129 CpuFeatures::FlushICache(p, count * sizeof(uint32_t));
134 Address RelocInfo::target_address() {
135 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
136 return Assembler::target_address_at(pc_, host_);
140 Address RelocInfo::target_address_address() {
141 DCHECK(IsCodeTarget(rmode_) ||
142 IsRuntimeEntry(rmode_) ||
143 rmode_ == EMBEDDED_OBJECT ||
144 rmode_ == EXTERNAL_REFERENCE);
145 // Read the address of the word containing the target_address in an
146 // instruction stream.
147 // The only architecture-independent user of this function is the serializer.
148 // The serializer uses it to find out how many raw bytes of instruction to
149 // output before the next target.
150 // For an instruction like LUI/ORI where the target bits are mixed into the
151 // instruction bits, the size of the target will be zero, indicating that the
152 // serializer should not step forward in memory after a target is resolved
153 // and written. In this case the target_address_address function should
154 // return the end of the instructions to be patched, allowing the
155 // deserializer to deserialize the instructions as raw bytes and put them in
156 // place, ready to be patched with the target. After jump optimization,
157 // that is the address of the instruction that follows J/JAL/JR/JALR
159 return reinterpret_cast<Address>(
160 pc_ + Assembler::kInstructionsFor32BitConstant * Assembler::kInstrSize);
164 Address RelocInfo::constant_pool_entry_address() {
170 int RelocInfo::target_address_size() {
171 return Assembler::kSpecialTargetSize;
175 void RelocInfo::set_target_address(Address target,
176 WriteBarrierMode write_barrier_mode,
177 ICacheFlushMode icache_flush_mode) {
178 DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
179 Assembler::set_target_address_at(pc_, host_, target, icache_flush_mode);
180 if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
181 host() != NULL && IsCodeTarget(rmode_)) {
182 Object* target_code = Code::GetCodeFromTargetAddress(target);
183 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
184 host(), this, HeapObject::cast(target_code));
189 Address Assembler::target_address_from_return_address(Address pc) {
190 return pc - kCallTargetAddressOffset;
194 Address Assembler::break_address_from_return_address(Address pc) {
195 return pc - Assembler::kPatchDebugBreakSlotReturnOffset;
199 Object* RelocInfo::target_object() {
200 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
201 return reinterpret_cast<Object*>(Assembler::target_address_at(pc_, host_));
205 Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
206 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
207 return Handle<Object>(reinterpret_cast<Object**>(
208 Assembler::target_address_at(pc_, host_)));
212 void RelocInfo::set_target_object(Object* target,
213 WriteBarrierMode write_barrier_mode,
214 ICacheFlushMode icache_flush_mode) {
215 DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
216 Assembler::set_target_address_at(pc_, host_,
217 reinterpret_cast<Address>(target),
219 if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
221 target->IsHeapObject()) {
222 host()->GetHeap()->incremental_marking()->RecordWrite(
223 host(), &Memory::Object_at(pc_), HeapObject::cast(target));
228 Address RelocInfo::target_reference() {
229 DCHECK(rmode_ == EXTERNAL_REFERENCE);
230 return Assembler::target_address_at(pc_, host_);
234 Address RelocInfo::target_runtime_entry(Assembler* origin) {
235 DCHECK(IsRuntimeEntry(rmode_));
236 return target_address();
240 void RelocInfo::set_target_runtime_entry(Address target,
241 WriteBarrierMode write_barrier_mode,
242 ICacheFlushMode icache_flush_mode) {
243 DCHECK(IsRuntimeEntry(rmode_));
244 if (target_address() != target)
245 set_target_address(target, write_barrier_mode, icache_flush_mode);
249 Handle<Cell> RelocInfo::target_cell_handle() {
250 DCHECK(rmode_ == RelocInfo::CELL);
251 Address address = Memory::Address_at(pc_);
252 return Handle<Cell>(reinterpret_cast<Cell**>(address));
256 Cell* RelocInfo::target_cell() {
257 DCHECK(rmode_ == RelocInfo::CELL);
258 return Cell::FromValueAddress(Memory::Address_at(pc_));
262 void RelocInfo::set_target_cell(Cell* cell,
263 WriteBarrierMode write_barrier_mode,
264 ICacheFlushMode icache_flush_mode) {
265 DCHECK(rmode_ == RelocInfo::CELL);
266 Address address = cell->address() + Cell::kValueOffset;
267 Memory::Address_at(pc_) = address;
268 if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL) {
269 // TODO(1550) We are passing NULL as a slot because cell can never be on
270 // evacuation candidate.
271 host()->GetHeap()->incremental_marking()->RecordWrite(
277 static const int kNoCodeAgeSequenceLength = 7 * Assembler::kInstrSize;
280 Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
281 UNREACHABLE(); // This should never be reached on Arm.
282 return Handle<Object>();
286 Code* RelocInfo::code_age_stub() {
287 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
288 return Code::GetCodeFromTargetAddress(
289 Assembler::target_address_at(pc_ + Assembler::kInstrSize, host_));
293 void RelocInfo::set_code_age_stub(Code* stub,
294 ICacheFlushMode icache_flush_mode) {
295 DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
296 Assembler::set_target_address_at(pc_ + Assembler::kInstrSize,
298 stub->instruction_start());
302 Address RelocInfo::call_address() {
303 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
304 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
305 // The pc_ offset of 0 assumes mips patched return sequence per
306 // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
307 // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
308 return Assembler::target_address_at(pc_, host_);
312 void RelocInfo::set_call_address(Address target) {
313 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
314 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
315 // The pc_ offset of 0 assumes mips patched return sequence per
316 // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
317 // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
318 Assembler::set_target_address_at(pc_, host_, target);
319 if (host() != NULL) {
320 Object* target_code = Code::GetCodeFromTargetAddress(target);
321 host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
322 host(), this, HeapObject::cast(target_code));
327 Object* RelocInfo::call_object() {
328 return *call_object_address();
332 Object** RelocInfo::call_object_address() {
333 DCHECK((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
334 (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
335 return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
339 void RelocInfo::set_call_object(Object* target) {
340 *call_object_address() = target;
344 void RelocInfo::WipeOut() {
345 DCHECK(IsEmbeddedObject(rmode_) ||
346 IsCodeTarget(rmode_) ||
347 IsRuntimeEntry(rmode_) ||
348 IsExternalReference(rmode_));
349 Assembler::set_target_address_at(pc_, host_, NULL);
353 bool RelocInfo::IsPatchedReturnSequence() {
354 Instr instr0 = Assembler::instr_at(pc_);
355 Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);
356 Instr instr2 = Assembler::instr_at(pc_ + 2 * Assembler::kInstrSize);
357 bool patched_return = ((instr0 & kOpcodeMask) == LUI &&
358 (instr1 & kOpcodeMask) == ORI &&
359 ((instr2 & kOpcodeMask) == JAL ||
360 ((instr2 & kOpcodeMask) == SPECIAL &&
361 (instr2 & kFunctionFieldMask) == JALR)));
362 return patched_return;
366 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
367 Instr current_instr = Assembler::instr_at(pc_);
368 return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
372 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
373 RelocInfo::Mode mode = rmode();
374 if (mode == RelocInfo::EMBEDDED_OBJECT) {
375 visitor->VisitEmbeddedPointer(this);
376 } else if (RelocInfo::IsCodeTarget(mode)) {
377 visitor->VisitCodeTarget(this);
378 } else if (mode == RelocInfo::CELL) {
379 visitor->VisitCell(this);
380 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
381 visitor->VisitExternalReference(this);
382 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
383 visitor->VisitCodeAgeSequence(this);
384 } else if (((RelocInfo::IsJSReturn(mode) &&
385 IsPatchedReturnSequence()) ||
386 (RelocInfo::IsDebugBreakSlot(mode) &&
387 IsPatchedDebugBreakSlotSequence())) &&
388 isolate->debug()->has_break_points()) {
389 visitor->VisitDebugTarget(this);
390 } else if (RelocInfo::IsRuntimeEntry(mode)) {
391 visitor->VisitRuntimeEntry(this);
396 template<typename StaticVisitor>
397 void RelocInfo::Visit(Heap* heap) {
398 RelocInfo::Mode mode = rmode();
399 if (mode == RelocInfo::EMBEDDED_OBJECT) {
400 StaticVisitor::VisitEmbeddedPointer(heap, this);
401 } else if (RelocInfo::IsCodeTarget(mode)) {
402 StaticVisitor::VisitCodeTarget(heap, this);
403 } else if (mode == RelocInfo::CELL) {
404 StaticVisitor::VisitCell(heap, this);
405 } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
406 StaticVisitor::VisitExternalReference(this);
407 } else if (RelocInfo::IsCodeAgeSequence(mode)) {
408 StaticVisitor::VisitCodeAgeSequence(heap, this);
409 } else if (heap->isolate()->debug()->has_break_points() &&
410 ((RelocInfo::IsJSReturn(mode) &&
411 IsPatchedReturnSequence()) ||
412 (RelocInfo::IsDebugBreakSlot(mode) &&
413 IsPatchedDebugBreakSlotSequence()))) {
414 StaticVisitor::VisitDebugTarget(heap, this);
415 } else if (RelocInfo::IsRuntimeEntry(mode)) {
416 StaticVisitor::VisitRuntimeEntry(this);
421 // -----------------------------------------------------------------------------
425 void Assembler::CheckBuffer() {
426 if (buffer_space() <= kGap) {
432 void Assembler::CheckTrampolinePoolQuick() {
433 if (pc_offset() >= next_buffer_check_) {
434 CheckTrampolinePool();
439 void Assembler::emit(Instr x) {
440 if (!is_buffer_growth_blocked()) {
443 *reinterpret_cast<Instr*>(pc_) = x;
445 CheckTrampolinePoolQuick();
449 } } // namespace v8::internal
451 #endif // V8_MIPS_ASSEMBLER_MIPS_INL_H_