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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/eh-frame.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
static const int kRaxDwarfCode = 0;
static const int kRbpDwarfCode = 6;
static const int kRspDwarfCode = 7;
static const int kRipDwarfCode = 16;
const int EhFrameConstants::kCodeAlignmentFactor = 1;
const int EhFrameConstants::kDataAlignmentFactor = -8;
void EhFrameWriter::WriteReturnAddressRegisterCode() {
WriteULeb128(kRipDwarfCode);
}
void EhFrameWriter::WriteInitialStateInCie() {
SetBaseAddressRegisterAndOffset(rsp, kPointerSize);
// x64 rip (r16) has no Register instance associated.
RecordRegisterSavedToStack(kRipDwarfCode, -kPointerSize);
}
// static
int EhFrameWriter::RegisterToDwarfCode(Register name) {
switch (name.code()) {
case Register::kCode_rbp:
return kRbpDwarfCode;
case Register::kCode_rsp:
return kRspDwarfCode;
case Register::kCode_rax:
return kRaxDwarfCode;
default:
UNIMPLEMENTED();
return -1;
}
}
#ifdef ENABLE_DISASSEMBLER
// static
const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
switch (code) {
case kRbpDwarfCode:
return "rbp";
case kRspDwarfCode:
return "rsp";
case kRipDwarfCode:
return "rip";
default:
UNIMPLEMENTED();
return nullptr;
}
}
#endif
} // namespace internal
} // namespace v8
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