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