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// 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 Assembler::emit_near_disp(Label* L) {
byte disp = 0x00;
if (L->is_near_linked()) {
int offset = L->near_link_pos() - pc_offset();
ASSERT(is_int8(offset));
disp = static_cast<byte>(offset & 0xFF);
}
L->link_to(pc_offset(), Label::kNear);
*pc_++ = disp;
}
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_