1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/eh-frame.h" 6 #include "src/zone/zone-containers.h" 7 8 namespace v8 { 9 namespace internal { 10 11 static const int kRaxDwarfCode = 0; 12 static const int kRbpDwarfCode = 6; 13 static const int kRspDwarfCode = 7; 14 static const int kRipDwarfCode = 16; 15 16 const int EhFrameConstants::kCodeAlignmentFactor = 1; 17 const int EhFrameConstants::kDataAlignmentFactor = -8; 18 WriteReturnAddressRegisterCode()19void EhFrameWriter::WriteReturnAddressRegisterCode() { 20 WriteULeb128(kRipDwarfCode); 21 } 22 WriteInitialStateInCie()23void EhFrameWriter::WriteInitialStateInCie() { 24 SetBaseAddressRegisterAndOffset(rsp, kPointerSize); 25 // x64 rip (r16) has no Register instance associated. 26 RecordRegisterSavedToStack(kRipDwarfCode, -kPointerSize); 27 } 28 29 // static RegisterToDwarfCode(Register name)30int EhFrameWriter::RegisterToDwarfCode(Register name) { 31 switch (name.code()) { 32 case kRegCode_rbp: 33 return kRbpDwarfCode; 34 case kRegCode_rsp: 35 return kRspDwarfCode; 36 case kRegCode_rax: 37 return kRaxDwarfCode; 38 default: 39 UNIMPLEMENTED(); 40 return -1; 41 } 42 } 43 44 #ifdef ENABLE_DISASSEMBLER 45 46 // static DwarfRegisterCodeToString(int code)47const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) { 48 switch (code) { 49 case kRbpDwarfCode: 50 return "rbp"; 51 case kRspDwarfCode: 52 return "rsp"; 53 case kRipDwarfCode: 54 return "rip"; 55 default: 56 UNIMPLEMENTED(); 57 return nullptr; 58 } 59 } 60 61 #endif 62 63 } // namespace internal 64 } // namespace v8 65