| // Copyright (c) 1994-2006 Sun Microsystems Inc. |
| // All Rights Reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // - Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // - Redistribution in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // |
| // - Neither the name of Sun Microsystems or the names of contributors may |
| // be used to endorse or promote products derived from this software without |
| // specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // The original source code covered by the above license above has been |
| // modified significantly by Google Inc. |
| // Copyright 2011 the V8 project authors. All rights reserved. |
| |
| // A light-weight IA32 Assembler. |
| |
| #ifndef V8_IA32_ASSEMBLER_IA32_INL_H_ |
| #define V8_IA32_ASSEMBLER_IA32_INL_H_ |
| |
| #include "cpu.h" |
| #include "debug.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // The modes possibly affected by apply must be in kApplyMask. |
| void RelocInfo::apply(intptr_t delta) { |
| if (rmode_ == RUNTIME_ENTRY || IsCodeTarget(rmode_)) { |
| int32_t* p = reinterpret_cast<int32_t*>(pc_); |
| *p -= delta; // Relocate entry. |
| CPU::FlushICache(p, sizeof(uint32_t)); |
| } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) { |
| // Special handling of js_return when a break point is set (call |
| // instruction has been inserted). |
| int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1); |
| *p -= delta; // Relocate entry. |
| CPU::FlushICache(p, sizeof(uint32_t)); |
| } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) { |
| // Special handling of a debug break slot when a break point is set (call |
| // instruction has been inserted). |
| int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1); |
| *p -= delta; // Relocate entry. |
| CPU::FlushICache(p, sizeof(uint32_t)); |
| } else if (IsInternalReference(rmode_)) { |
| // absolute code pointer inside code object moves with the code object. |
| int32_t* p = reinterpret_cast<int32_t*>(pc_); |
| *p += delta; // Relocate entry. |
| CPU::FlushICache(p, sizeof(uint32_t)); |
| } |
| } |
| |
| |
| Address RelocInfo::target_address() { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY); |
| return Assembler::target_address_at(pc_); |
| } |
| |
| |
| Address RelocInfo::target_address_address() { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY); |
| return reinterpret_cast<Address>(pc_); |
| } |
| |
| |
| int RelocInfo::target_address_size() { |
| return Assembler::kExternalTargetSize; |
| } |
| |
| |
| void RelocInfo::set_target_address(Address target) { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY); |
| Assembler::set_target_address_at(pc_, target); |
| } |
| |
| |
| Object* RelocInfo::target_object() { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); |
| return Memory::Object_at(pc_); |
| } |
| |
| |
| Handle<Object> RelocInfo::target_object_handle(Assembler* origin) { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); |
| return Memory::Object_Handle_at(pc_); |
| } |
| |
| |
| Object** RelocInfo::target_object_address() { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); |
| return &Memory::Object_at(pc_); |
| } |
| |
| |
| void RelocInfo::set_target_object(Object* target) { |
| ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT); |
| Memory::Object_at(pc_) = target; |
| CPU::FlushICache(pc_, sizeof(Address)); |
| } |
| |
| |
| Address* RelocInfo::target_reference_address() { |
| ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE); |
| return reinterpret_cast<Address*>(pc_); |
| } |
| |
| |
| Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() { |
| ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL); |
| Address address = Memory::Address_at(pc_); |
| return Handle<JSGlobalPropertyCell>( |
| reinterpret_cast<JSGlobalPropertyCell**>(address)); |
| } |
| |
| |
| JSGlobalPropertyCell* RelocInfo::target_cell() { |
| ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL); |
| Address address = Memory::Address_at(pc_); |
| Object* object = HeapObject::FromAddress( |
| address - JSGlobalPropertyCell::kValueOffset); |
| return reinterpret_cast<JSGlobalPropertyCell*>(object); |
| } |
| |
| |
| void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell) { |
| ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL); |
| Address address = cell->address() + JSGlobalPropertyCell::kValueOffset; |
| Memory::Address_at(pc_) = address; |
| CPU::FlushICache(pc_, sizeof(Address)); |
| } |
| |
| |
| Address RelocInfo::call_address() { |
| ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) || |
| (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence())); |
| return Assembler::target_address_at(pc_ + 1); |
| } |
| |
| |
| void RelocInfo::set_call_address(Address target) { |
| ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) || |
| (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence())); |
| Assembler::set_target_address_at(pc_ + 1, target); |
| } |
| |
| |
| Object* RelocInfo::call_object() { |
| return *call_object_address(); |
| } |
| |
| |
| void RelocInfo::set_call_object(Object* target) { |
| *call_object_address() = target; |
| } |
| |
| |
| Object** RelocInfo::call_object_address() { |
| ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) || |
| (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence())); |
| return reinterpret_cast<Object**>(pc_ + 1); |
| } |
| |
| |
| bool RelocInfo::IsPatchedReturnSequence() { |
| return *pc_ == 0xE8; |
| } |
| |
| |
| bool RelocInfo::IsPatchedDebugBreakSlotSequence() { |
| return !Assembler::IsNop(pc()); |
| } |
| |
| |
| void RelocInfo::Visit(ObjectVisitor* visitor) { |
| RelocInfo::Mode mode = rmode(); |
| if (mode == RelocInfo::EMBEDDED_OBJECT) { |
| visitor->VisitPointer(target_object_address()); |
| CPU::FlushICache(pc_, sizeof(Address)); |
| } else if (RelocInfo::IsCodeTarget(mode)) { |
| visitor->VisitCodeTarget(this); |
| } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) { |
| visitor->VisitGlobalPropertyCell(this); |
| } else if (mode == RelocInfo::EXTERNAL_REFERENCE) { |
| visitor->VisitExternalReference(target_reference_address()); |
| CPU::FlushICache(pc_, sizeof(Address)); |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| // TODO(isolates): Get a cached isolate below. |
| } else if (((RelocInfo::IsJSReturn(mode) && |
| IsPatchedReturnSequence()) || |
| (RelocInfo::IsDebugBreakSlot(mode) && |
| IsPatchedDebugBreakSlotSequence())) && |
| Isolate::Current()->debug()->has_break_points()) { |
| visitor->VisitDebugTarget(this); |
| #endif |
| } else if (mode == RelocInfo::RUNTIME_ENTRY) { |
| visitor->VisitRuntimeEntry(this); |
| } |
| } |
| |
| |
| template<typename StaticVisitor> |
| void RelocInfo::Visit(Heap* heap) { |
| RelocInfo::Mode mode = rmode(); |
| if (mode == RelocInfo::EMBEDDED_OBJECT) { |
| StaticVisitor::VisitPointer(heap, target_object_address()); |
| CPU::FlushICache(pc_, sizeof(Address)); |
| } else if (RelocInfo::IsCodeTarget(mode)) { |
| StaticVisitor::VisitCodeTarget(heap, this); |
| } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) { |
| StaticVisitor::VisitGlobalPropertyCell(heap, this); |
| } else if (mode == RelocInfo::EXTERNAL_REFERENCE) { |
| StaticVisitor::VisitExternalReference(target_reference_address()); |
| CPU::FlushICache(pc_, sizeof(Address)); |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| } else if (heap->isolate()->debug()->has_break_points() && |
| ((RelocInfo::IsJSReturn(mode) && |
| IsPatchedReturnSequence()) || |
| (RelocInfo::IsDebugBreakSlot(mode) && |
| IsPatchedDebugBreakSlotSequence()))) { |
| StaticVisitor::VisitDebugTarget(heap, this); |
| #endif |
| } else if (mode == RelocInfo::RUNTIME_ENTRY) { |
| StaticVisitor::VisitRuntimeEntry(this); |
| } |
| } |
| |
| |
| |
| Immediate::Immediate(int x) { |
| x_ = x; |
| rmode_ = RelocInfo::NONE; |
| } |
| |
| |
| Immediate::Immediate(const ExternalReference& ext) { |
| x_ = reinterpret_cast<int32_t>(ext.address()); |
| rmode_ = RelocInfo::EXTERNAL_REFERENCE; |
| } |
| |
| |
| Immediate::Immediate(Label* internal_offset) { |
| x_ = reinterpret_cast<int32_t>(internal_offset); |
| rmode_ = RelocInfo::INTERNAL_REFERENCE; |
| } |
| |
| |
| Immediate::Immediate(Handle<Object> handle) { |
| // Verify all Objects referred by code are NOT in new space. |
| Object* obj = *handle; |
| ASSERT(!HEAP->InNewSpace(obj)); |
| if (obj->IsHeapObject()) { |
| x_ = reinterpret_cast<intptr_t>(handle.location()); |
| rmode_ = RelocInfo::EMBEDDED_OBJECT; |
| } else { |
| // no relocation needed |
| x_ = reinterpret_cast<intptr_t>(obj); |
| rmode_ = RelocInfo::NONE; |
| } |
| } |
| |
| |
| Immediate::Immediate(Smi* value) { |
| x_ = reinterpret_cast<intptr_t>(value); |
| rmode_ = RelocInfo::NONE; |
| } |
| |
| |
| Immediate::Immediate(Address addr) { |
| x_ = reinterpret_cast<int32_t>(addr); |
| rmode_ = RelocInfo::NONE; |
| } |
| |
| |
| void Assembler::emit(uint32_t x) { |
| *reinterpret_cast<uint32_t*>(pc_) = x; |
| pc_ += sizeof(uint32_t); |
| } |
| |
| |
| void Assembler::emit(Handle<Object> handle) { |
| // Verify all Objects referred by code are NOT in new space. |
| Object* obj = *handle; |
| ASSERT(!isolate()->heap()->InNewSpace(obj)); |
| if (obj->IsHeapObject()) { |
| emit(reinterpret_cast<intptr_t>(handle.location()), |
| RelocInfo::EMBEDDED_OBJECT); |
| } else { |
| // no relocation needed |
| emit(reinterpret_cast<intptr_t>(obj)); |
| } |
| } |
| |
| |
| void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, unsigned id) { |
| if (rmode == RelocInfo::CODE_TARGET && id != kNoASTId) { |
| RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, static_cast<intptr_t>(id)); |
| } else if (rmode != RelocInfo::NONE) { |
| RecordRelocInfo(rmode); |
| } |
| emit(x); |
| } |
| |
| |
| void Assembler::emit(const Immediate& x) { |
| if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) { |
| Label* label = reinterpret_cast<Label*>(x.x_); |
| emit_code_relative_offset(label); |
| return; |
| } |
| if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_); |
| emit(x.x_); |
| } |
| |
| |
| void Assembler::emit_code_relative_offset(Label* label) { |
| if (label->is_bound()) { |
| int32_t pos; |
| pos = label->pos() + Code::kHeaderSize - kHeapObjectTag; |
| emit(pos); |
| } else { |
| emit_disp(label, Displacement::CODE_RELATIVE); |
| } |
| } |
| |
| |
| void Assembler::emit_w(const Immediate& x) { |
| ASSERT(x.rmode_ == RelocInfo::NONE); |
| uint16_t value = static_cast<uint16_t>(x.x_); |
| reinterpret_cast<uint16_t*>(pc_)[0] = value; |
| pc_ += sizeof(uint16_t); |
| } |
| |
| |
| Address Assembler::target_address_at(Address pc) { |
| return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc); |
| } |
| |
| |
| void Assembler::set_target_address_at(Address pc, Address target) { |
| int32_t* p = reinterpret_cast<int32_t*>(pc); |
| *p = target - (pc + sizeof(int32_t)); |
| CPU::FlushICache(p, sizeof(int32_t)); |
| } |
| |
| |
| Displacement Assembler::disp_at(Label* L) { |
| return Displacement(long_at(L->pos())); |
| } |
| |
| |
| void Assembler::disp_at_put(Label* L, Displacement disp) { |
| long_at_put(L->pos(), disp.data()); |
| } |
| |
| |
| void Assembler::emit_disp(Label* L, Displacement::Type type) { |
| Displacement disp(L, type); |
| L->link_to(pc_offset()); |
| emit(static_cast<int>(disp.data())); |
| } |
| |
| |
| void Operand::set_modrm(int mod, Register rm) { |
| ASSERT((mod & -4) == 0); |
| buf_[0] = mod << 6 | rm.code(); |
| len_ = 1; |
| } |
| |
| |
| void Operand::set_sib(ScaleFactor scale, Register index, Register base) { |
| ASSERT(len_ == 1); |
| ASSERT((scale & -4) == 0); |
| // Use SIB with no index register only for base esp. |
| ASSERT(!index.is(esp) || base.is(esp)); |
| buf_[1] = scale << 6 | index.code() << 3 | base.code(); |
| len_ = 2; |
| } |
| |
| |
| void Operand::set_disp8(int8_t disp) { |
| ASSERT(len_ == 1 || len_ == 2); |
| *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp; |
| } |
| |
| |
| void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) { |
| ASSERT(len_ == 1 || len_ == 2); |
| int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]); |
| *p = disp; |
| len_ += sizeof(int32_t); |
| rmode_ = rmode; |
| } |
| |
| Operand::Operand(Register reg) { |
| // reg |
| set_modrm(3, reg); |
| } |
| |
| |
| Operand::Operand(XMMRegister xmm_reg) { |
| Register reg = { xmm_reg.code() }; |
| set_modrm(3, reg); |
| } |
| |
| |
| Operand::Operand(int32_t disp, RelocInfo::Mode rmode) { |
| // [disp/r] |
| set_modrm(0, ebp); |
| set_dispr(disp, rmode); |
| } |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_IA32_ASSEMBLER_IA32_INL_H_ |