// 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 2014 the V8 project authors. All rights reserved.
#ifndef V8_PPC_ASSEMBLER_PPC_INL_H_
#define V8_PPC_ASSEMBLER_PPC_INL_H_
#include "src/ppc/assembler-ppc.h"
#include "src/assembler.h"
#include "src/debug/debug.h"
namespace v8 {
namespace internal {
bool CpuFeatures::SupportsCrankshaft() { return true; }
void RelocInfo::apply(intptr_t delta) {
// absolute code pointer inside code object moves with the code object.
if (IsInternalReference(rmode_)) {
// Jump table entry
Address target = Memory::Address_at(pc_);
Memory::Address_at(pc_) = target + delta;
} else {
// mov sequence
DCHECK(IsInternalReferenceEncoded(rmode_));
Address target = Assembler::target_address_at(pc_, host_);
Assembler::set_target_address_at(isolate_, pc_, host_, target + delta,
SKIP_ICACHE_FLUSH);
}
}
Address RelocInfo::target_internal_reference() {
if (IsInternalReference(rmode_)) {
// Jump table entry
return Memory::Address_at(pc_);
} else {
// mov sequence
DCHECK(IsInternalReferenceEncoded(rmode_));
return Assembler::target_address_at(pc_, host_);
}
}
Address RelocInfo::target_internal_reference_address() {
DCHECK(IsInternalReference(rmode_) || IsInternalReferenceEncoded(rmode_));
return reinterpret_cast<Address>(pc_);
}
Address RelocInfo::target_address() {
DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
return Assembler::target_address_at(pc_, host_);
}
Address RelocInfo::target_address_address() {
DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) ||
rmode_ == EMBEDDED_OBJECT || rmode_ == EXTERNAL_REFERENCE);
if (FLAG_enable_embedded_constant_pool &&
Assembler::IsConstantPoolLoadStart(pc_)) {
// We return the PC for embedded constant pool since this function is used
// by the serializer and expects the address to reside within the code
// object.
return reinterpret_cast<Address>(pc_);
}
// Read the address of the word containing the target_address in an
// instruction stream.
// The only architecture-independent user of this function is the serializer.
// The serializer uses it to find out how many raw bytes of instruction to
// output before the next target.
// For an instruction like LIS/ORI where the target bits are mixed into the
// instruction bits, the size of the target will be zero, indicating that the
// serializer should not step forward in memory after a target is resolved
// and written.
return reinterpret_cast<Address>(pc_);
}
Address RelocInfo::constant_pool_entry_address() {
if (FLAG_enable_embedded_constant_pool) {
Address constant_pool = host_->constant_pool();
DCHECK(constant_pool);
ConstantPoolEntry::Access access;
if (Assembler::IsConstantPoolLoadStart(pc_, &access))
return Assembler::target_constant_pool_address_at(
pc_, constant_pool, access, ConstantPoolEntry::INTPTR);
}
UNREACHABLE();
return NULL;
}
int RelocInfo::target_address_size() { return Assembler::kSpecialTargetSize; }
void RelocInfo::set_target_address(Address target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_));
Assembler::set_target_address_at(isolate_, pc_, host_, target,
icache_flush_mode);
if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL &&
IsCodeTarget(rmode_)) {
Object* target_code = Code::GetCodeFromTargetAddress(target);
host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
host(), this, HeapObject::cast(target_code));
}
}
Address Assembler::target_address_from_return_address(Address pc) {
// Returns the address of the call target from the return address that will
// be returned to after a call.
// Call sequence is :
// mov ip, @ call address
// mtlr ip
// blrl
// @ return address
int len;
ConstantPoolEntry::Access access;
if (FLAG_enable_embedded_constant_pool &&
IsConstantPoolLoadEnd(pc - 3 * kInstrSize, &access)) {
len = (access == ConstantPoolEntry::OVERFLOWED) ? 2 : 1;
} else {
len = kMovInstructionsNoConstantPool;
}
return pc - (len + 2) * kInstrSize;
}
Address Assembler::return_address_from_call_start(Address pc) {
int len;
ConstantPoolEntry::Access access;
if (FLAG_enable_embedded_constant_pool &&
IsConstantPoolLoadStart(pc, &access)) {
len = (access == ConstantPoolEntry::OVERFLOWED) ? 2 : 1;
} else {
len = kMovInstructionsNoConstantPool;
}
return pc + (len + 2) * kInstrSize;
}
Object* RelocInfo::target_object() {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
return reinterpret_cast<Object*>(Assembler::target_address_at(pc_, host_));
}
Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
return Handle<Object>(
reinterpret_cast<Object**>(Assembler::target_address_at(pc_, host_)));
}
void RelocInfo::set_target_object(Object* target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
Assembler::set_target_address_at(isolate_, pc_, host_,
reinterpret_cast<Address>(target),
icache_flush_mode);
if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL &&
target->IsHeapObject()) {
host()->GetHeap()->incremental_marking()->RecordWrite(
host(), &Memory::Object_at(pc_), HeapObject::cast(target));
}
}
Address RelocInfo::target_external_reference() {
DCHECK(rmode_ == EXTERNAL_REFERENCE);
return Assembler::target_address_at(pc_, host_);
}
Address RelocInfo::target_runtime_entry(Assembler* origin) {
DCHECK(IsRuntimeEntry(rmode_));
return target_address();
}
void RelocInfo::set_target_runtime_entry(Address target,
WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(IsRuntimeEntry(rmode_));
if (target_address() != target)
set_target_address(target, write_barrier_mode, icache_flush_mode);
}
Handle<Cell> RelocInfo::target_cell_handle() {
DCHECK(rmode_ == RelocInfo::CELL);
Address address = Memory::Address_at(pc_);
return Handle<Cell>(reinterpret_cast<Cell**>(address));
}
Cell* RelocInfo::target_cell() {
DCHECK(rmode_ == RelocInfo::CELL);
return Cell::FromValueAddress(Memory::Address_at(pc_));
}
void RelocInfo::set_target_cell(Cell* cell, WriteBarrierMode write_barrier_mode,
ICacheFlushMode icache_flush_mode) {
DCHECK(rmode_ == RelocInfo::CELL);
Address address = cell->address() + Cell::kValueOffset;
Memory::Address_at(pc_) = address;
if (write_barrier_mode == UPDATE_WRITE_BARRIER && host() != NULL) {
// TODO(1550) We are passing NULL as a slot because cell can never be on
// evacuation candidate.
host()->GetHeap()->incremental_marking()->RecordWrite(host(), NULL, cell);
}
}
static const int kNoCodeAgeInstructions =
FLAG_enable_embedded_constant_pool ? 7 : 6;
static const int kCodeAgingInstructions =
Assembler::kMovInstructionsNoConstantPool + 3;
static const int kNoCodeAgeSequenceInstructions =
((kNoCodeAgeInstructions >= kCodeAgingInstructions)
? kNoCodeAgeInstructions
: kCodeAgingInstructions);
static const int kNoCodeAgeSequenceNops =
(kNoCodeAgeSequenceInstructions - kNoCodeAgeInstructions);
static const int kCodeAgingSequenceNops =
(kNoCodeAgeSequenceInstructions - kCodeAgingInstructions);
static const int kCodeAgingTargetDelta = 1 * Assembler::kInstrSize;
static const int kNoCodeAgeSequenceLength =
(kNoCodeAgeSequenceInstructions * Assembler::kInstrSize);
Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
UNREACHABLE(); // This should never be reached on PPC.
return Handle<Object>();
}
Code* RelocInfo::code_age_stub() {
DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
return Code::GetCodeFromTargetAddress(
Assembler::target_address_at(pc_ + kCodeAgingTargetDelta, host_));
}
void RelocInfo::set_code_age_stub(Code* stub,
ICacheFlushMode icache_flush_mode) {
DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
Assembler::set_target_address_at(isolate_, pc_ + kCodeAgingTargetDelta, host_,
stub->instruction_start(),
icache_flush_mode);
}
Address RelocInfo::debug_call_address() {
DCHECK(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence());
return Assembler::target_address_at(pc_, host_);
}
void RelocInfo::set_debug_call_address(Address target) {
DCHECK(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence());
Assembler::set_target_address_at(isolate_, pc_, host_, target);
if (host() != NULL) {
Object* target_code = Code::GetCodeFromTargetAddress(target);
host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
host(), this, HeapObject::cast(target_code));
}
}
void RelocInfo::WipeOut() {
DCHECK(IsEmbeddedObject(rmode_) || IsCodeTarget(rmode_) ||
IsRuntimeEntry(rmode_) || IsExternalReference(rmode_) ||
IsInternalReference(rmode_) || IsInternalReferenceEncoded(rmode_));
if (IsInternalReference(rmode_)) {
// Jump table entry
Memory::Address_at(pc_) = NULL;
} else if (IsInternalReferenceEncoded(rmode_)) {
// mov sequence
// Currently used only by deserializer, no need to flush.
Assembler::set_target_address_at(isolate_, pc_, host_, NULL,
SKIP_ICACHE_FLUSH);
} else {
Assembler::set_target_address_at(isolate_, pc_, host_, NULL);
}
}
bool RelocInfo::IsPatchedReturnSequence() {
//
// The patched return sequence is defined by
// BreakLocation::SetDebugBreakAtReturn()
// FIXED_SEQUENCE
Instr instr0 = Assembler::instr_at(pc_);
Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);
#if V8_TARGET_ARCH_PPC64
Instr instr3 = Assembler::instr_at(pc_ + (3 * Assembler::kInstrSize));
Instr instr4 = Assembler::instr_at(pc_ + (4 * Assembler::kInstrSize));
Instr binstr = Assembler::instr_at(pc_ + (7 * Assembler::kInstrSize));
#else
Instr binstr = Assembler::instr_at(pc_ + 4 * Assembler::kInstrSize);
#endif
bool patched_return =
((instr0 & kOpcodeMask) == ADDIS && (instr1 & kOpcodeMask) == ORI &&
#if V8_TARGET_ARCH_PPC64
(instr3 & kOpcodeMask) == ORIS && (instr4 & kOpcodeMask) == ORI &&
#endif
(binstr == 0x7d821008)); // twge r2, r2
// printf("IsPatchedReturnSequence: %d\n", patched_return);
return patched_return;
}
bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
Instr current_instr = Assembler::instr_at(pc_);
return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
}
void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
RelocInfo::Mode mode = rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT) {
visitor->VisitEmbeddedPointer(this);
} else if (RelocInfo::IsCodeTarget(mode)) {
visitor->VisitCodeTarget(this);
} else if (mode == RelocInfo::CELL) {
visitor->VisitCell(this);
} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
visitor->VisitExternalReference(this);
} else if (mode == RelocInfo::INTERNAL_REFERENCE ||
mode == RelocInfo::INTERNAL_REFERENCE_ENCODED) {
visitor->VisitInternalReference(this);
} else if (RelocInfo::IsCodeAgeSequence(mode)) {
visitor->VisitCodeAgeSequence(this);
} else if (RelocInfo::IsDebugBreakSlot(mode) &&
IsPatchedDebugBreakSlotSequence()) {
visitor->VisitDebugTarget(this);
} else if (IsRuntimeEntry(mode)) {
visitor->VisitRuntimeEntry(this);
}
}
template <typename StaticVisitor>
void RelocInfo::Visit(Heap* heap) {
RelocInfo::Mode mode = rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT) {
StaticVisitor::VisitEmbeddedPointer(heap, this);
} else if (RelocInfo::IsCodeTarget(mode)) {
StaticVisitor::VisitCodeTarget(heap, this);
} else if (mode == RelocInfo::CELL) {
StaticVisitor::VisitCell(heap, this);
} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
StaticVisitor::VisitExternalReference(this);
} else if (mode == RelocInfo::INTERNAL_REFERENCE ||
mode == RelocInfo::INTERNAL_REFERENCE_ENCODED) {
StaticVisitor::VisitInternalReference(this);
} else if (RelocInfo::IsCodeAgeSequence(mode)) {
StaticVisitor::VisitCodeAgeSequence(heap, this);
} else if (RelocInfo::IsDebugBreakSlot(mode) &&
IsPatchedDebugBreakSlotSequence()) {
StaticVisitor::VisitDebugTarget(heap, this);
} else if (IsRuntimeEntry(mode)) {
StaticVisitor::VisitRuntimeEntry(this);
}
}
Operand::Operand(intptr_t immediate, RelocInfo::Mode rmode) {
rm_ = no_reg;
imm_ = immediate;
rmode_ = rmode;
}
Operand::Operand(const ExternalReference& f) {
rm_ = no_reg;
imm_ = reinterpret_cast<intptr_t>(f.address());
rmode_ = RelocInfo::EXTERNAL_REFERENCE;
}
Operand::Operand(Smi* value) {
rm_ = no_reg;
imm_ = reinterpret_cast<intptr_t>(value);
rmode_ = kRelocInfo_NONEPTR;
}
Operand::Operand(Register rm) {
rm_ = rm;
rmode_ = kRelocInfo_NONEPTR; // PPC -why doesn't ARM do this?
}
void Assembler::CheckBuffer() {
if (buffer_space() <= kGap) {
GrowBuffer();
}
}
void Assembler::TrackBranch() {
DCHECK(!trampoline_emitted_);
int count = tracked_branch_count_++;
if (count == 0) {
// We leave space (kMaxBlockTrampolineSectionSize)
// for BlockTrampolinePoolScope buffer.
next_trampoline_check_ =
pc_offset() + kMaxCondBranchReach - kMaxBlockTrampolineSectionSize;
} else {
next_trampoline_check_ -= kTrampolineSlotsSize;
}
}
void Assembler::UntrackBranch() {
DCHECK(!trampoline_emitted_);
DCHECK(tracked_branch_count_ > 0);
int count = --tracked_branch_count_;
if (count == 0) {
// Reset
next_trampoline_check_ = kMaxInt;
} else {
next_trampoline_check_ += kTrampolineSlotsSize;
}
}
void Assembler::CheckTrampolinePoolQuick() {
if (pc_offset() >= next_trampoline_check_) {
CheckTrampolinePool();
}
}
void Assembler::emit(Instr x) {
CheckBuffer();
*reinterpret_cast<Instr*>(pc_) = x;
pc_ += kInstrSize;
CheckTrampolinePoolQuick();
}
bool Operand::is_reg() const { return rm_.is_valid(); }
// Fetch the 32bit value from the FIXED_SEQUENCE lis/ori
Address Assembler::target_address_at(Address pc, Address constant_pool) {
if (FLAG_enable_embedded_constant_pool && constant_pool) {
ConstantPoolEntry::Access access;
if (IsConstantPoolLoadStart(pc, &access))
return Memory::Address_at(target_constant_pool_address_at(
pc, constant_pool, access, ConstantPoolEntry::INTPTR));
}
Instr instr1 = instr_at(pc);
Instr instr2 = instr_at(pc + kInstrSize);
// Interpret 2 instructions generated by lis/ori
if (IsLis(instr1) && IsOri(instr2)) {
#if V8_TARGET_ARCH_PPC64
Instr instr4 = instr_at(pc + (3 * kInstrSize));
Instr instr5 = instr_at(pc + (4 * kInstrSize));
// Assemble the 64 bit value.
uint64_t hi = (static_cast<uint32_t>((instr1 & kImm16Mask) << 16) |
static_cast<uint32_t>(instr2 & kImm16Mask));
uint64_t lo = (static_cast<uint32_t>((instr4 & kImm16Mask) << 16) |
static_cast<uint32_t>(instr5 & kImm16Mask));
return reinterpret_cast<Address>((hi << 32) | lo);
#else
// Assemble the 32 bit value.
return reinterpret_cast<Address>(((instr1 & kImm16Mask) << 16) |
(instr2 & kImm16Mask));
#endif
}
UNREACHABLE();
return NULL;
}
#if V8_TARGET_ARCH_PPC64
const int kLoadIntptrOpcode = LD;
#else
const int kLoadIntptrOpcode = LWZ;
#endif
// Constant pool load sequence detection:
// 1) REGULAR access:
// load <dst>, kConstantPoolRegister + <offset>
//
// 2) OVERFLOWED access:
// addis <scratch>, kConstantPoolRegister, <offset_high>
// load <dst>, <scratch> + <offset_low>
bool Assembler::IsConstantPoolLoadStart(Address pc,
ConstantPoolEntry::Access* access) {
Instr instr = instr_at(pc);
int opcode = instr & kOpcodeMask;
if (!GetRA(instr).is(kConstantPoolRegister)) return false;
bool overflowed = (opcode == ADDIS);
#ifdef DEBUG
if (overflowed) {
opcode = instr_at(pc + kInstrSize) & kOpcodeMask;
}
DCHECK(opcode == kLoadIntptrOpcode || opcode == LFD);
#endif
if (access) {
*access = (overflowed ? ConstantPoolEntry::OVERFLOWED
: ConstantPoolEntry::REGULAR);
}
return true;
}
bool Assembler::IsConstantPoolLoadEnd(Address pc,
ConstantPoolEntry::Access* access) {
Instr instr = instr_at(pc);
int opcode = instr & kOpcodeMask;
bool overflowed = false;
if (!(opcode == kLoadIntptrOpcode || opcode == LFD)) return false;
if (!GetRA(instr).is(kConstantPoolRegister)) {
instr = instr_at(pc - kInstrSize);
opcode = instr & kOpcodeMask;
if ((opcode != ADDIS) || !GetRA(instr).is(kConstantPoolRegister)) {
return false;
}
overflowed = true;
}
if (access) {
*access = (overflowed ? ConstantPoolEntry::OVERFLOWED
: ConstantPoolEntry::REGULAR);
}
return true;
}
int Assembler::GetConstantPoolOffset(Address pc,
ConstantPoolEntry::Access access,
ConstantPoolEntry::Type type) {
bool overflowed = (access == ConstantPoolEntry::OVERFLOWED);
#ifdef DEBUG
ConstantPoolEntry::Access access_check =
static_cast<ConstantPoolEntry::Access>(-1);
DCHECK(IsConstantPoolLoadStart(pc, &access_check));
DCHECK(access_check == access);
#endif
int offset;
if (overflowed) {
offset = (instr_at(pc) & kImm16Mask) << 16;
offset += SIGN_EXT_IMM16(instr_at(pc + kInstrSize) & kImm16Mask);
DCHECK(!is_int16(offset));
} else {
offset = SIGN_EXT_IMM16((instr_at(pc) & kImm16Mask));
}
return offset;
}
void Assembler::PatchConstantPoolAccessInstruction(
int pc_offset, int offset, ConstantPoolEntry::Access access,
ConstantPoolEntry::Type type) {
Address pc = buffer_ + pc_offset;
bool overflowed = (access == ConstantPoolEntry::OVERFLOWED);
CHECK(overflowed != is_int16(offset));
#ifdef DEBUG
ConstantPoolEntry::Access access_check =
static_cast<ConstantPoolEntry::Access>(-1);
DCHECK(IsConstantPoolLoadStart(pc, &access_check));
DCHECK(access_check == access);
#endif
if (overflowed) {
int hi_word = static_cast<int>(offset >> 16);
int lo_word = static_cast<int>(offset & 0xffff);
if (lo_word & 0x8000) hi_word++;
Instr instr1 = instr_at(pc);
Instr instr2 = instr_at(pc + kInstrSize);
instr1 &= ~kImm16Mask;
instr1 |= (hi_word & kImm16Mask);
instr2 &= ~kImm16Mask;
instr2 |= (lo_word & kImm16Mask);
instr_at_put(pc, instr1);
instr_at_put(pc + kInstrSize, instr2);
} else {
Instr instr = instr_at(pc);
instr &= ~kImm16Mask;
instr |= (offset & kImm16Mask);
instr_at_put(pc, instr);
}
}
Address Assembler::target_constant_pool_address_at(
Address pc, Address constant_pool, ConstantPoolEntry::Access access,
ConstantPoolEntry::Type type) {
Address addr = constant_pool;
DCHECK(addr);
addr += GetConstantPoolOffset(pc, access, type);
return addr;
}
// This sets the branch destination (which gets loaded at the call address).
// This is for calls and branches within generated code. The serializer
// has already deserialized the mov instructions etc.
// There is a FIXED_SEQUENCE assumption here
void Assembler::deserialization_set_special_target_at(
Isolate* isolate, Address instruction_payload, Code* code, Address target) {
set_target_address_at(isolate, instruction_payload, code, target);
}
void Assembler::deserialization_set_target_internal_reference_at(
Isolate* isolate, Address pc, Address target, RelocInfo::Mode mode) {
if (RelocInfo::IsInternalReferenceEncoded(mode)) {
Code* code = NULL;
set_target_address_at(isolate, pc, code, target, SKIP_ICACHE_FLUSH);
} else {
Memory::Address_at(pc) = target;
}
}
// This code assumes the FIXED_SEQUENCE of lis/ori
void Assembler::set_target_address_at(Isolate* isolate, Address pc,
Address constant_pool, Address target,
ICacheFlushMode icache_flush_mode) {
if (FLAG_enable_embedded_constant_pool && constant_pool) {
ConstantPoolEntry::Access access;
if (IsConstantPoolLoadStart(pc, &access)) {
Memory::Address_at(target_constant_pool_address_at(
pc, constant_pool, access, ConstantPoolEntry::INTPTR)) = target;
return;
}
}
Instr instr1 = instr_at(pc);
Instr instr2 = instr_at(pc + kInstrSize);
// Interpret 2 instructions generated by lis/ori
if (IsLis(instr1) && IsOri(instr2)) {
#if V8_TARGET_ARCH_PPC64
Instr instr4 = instr_at(pc + (3 * kInstrSize));
Instr instr5 = instr_at(pc + (4 * kInstrSize));
// Needs to be fixed up when mov changes to handle 64-bit values.
uint32_t* p = reinterpret_cast<uint32_t*>(pc);
uintptr_t itarget = reinterpret_cast<uintptr_t>(target);
instr5 &= ~kImm16Mask;
instr5 |= itarget & kImm16Mask;
itarget = itarget >> 16;
instr4 &= ~kImm16Mask;
instr4 |= itarget & kImm16Mask;
itarget = itarget >> 16;
instr2 &= ~kImm16Mask;
instr2 |= itarget & kImm16Mask;
itarget = itarget >> 16;
instr1 &= ~kImm16Mask;
instr1 |= itarget & kImm16Mask;
itarget = itarget >> 16;
*p = instr1;
*(p + 1) = instr2;
*(p + 3) = instr4;
*(p + 4) = instr5;
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(isolate, p, 5 * kInstrSize);
}
#else
uint32_t* p = reinterpret_cast<uint32_t*>(pc);
uint32_t itarget = reinterpret_cast<uint32_t>(target);
int lo_word = itarget & kImm16Mask;
int hi_word = itarget >> 16;
instr1 &= ~kImm16Mask;
instr1 |= hi_word;
instr2 &= ~kImm16Mask;
instr2 |= lo_word;
*p = instr1;
*(p + 1) = instr2;
if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
Assembler::FlushICache(isolate, p, 2 * kInstrSize);
}
#endif
return;
}
UNREACHABLE();
}
} // namespace internal
} // namespace v8
#endif // V8_PPC_ASSEMBLER_PPC_INL_H_