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 7 namespace v8 { 8 namespace internal { 9 10 static const int kRaxDwarfCode = 0; 11 static const int kRbpDwarfCode = 6; 12 static const int kRspDwarfCode = 7; 13 static const int kRipDwarfCode = 16; 14 15 const int EhFrameConstants::kCodeAlignmentFactor = 1; 16 const int EhFrameConstants::kDataAlignmentFactor = -8; 17 18 void EhFrameWriter::WriteReturnAddressRegisterCode() { 19 WriteULeb128(kRipDwarfCode); 20 } 21 22 void EhFrameWriter::WriteInitialStateInCie() { 23 SetBaseAddressRegisterAndOffset(rsp, kPointerSize); 24 // x64 rip (r16) has no Register instance associated. 25 RecordRegisterSavedToStack(kRipDwarfCode, -kPointerSize); 26 } 27 28 // static 29 int EhFrameWriter::RegisterToDwarfCode(Register name) { 30 switch (name.code()) { 31 case Register::kCode_rbp: 32 return kRbpDwarfCode; 33 case Register::kCode_rsp: 34 return kRspDwarfCode; 35 case Register::kCode_rax: 36 return kRaxDwarfCode; 37 default: 38 UNIMPLEMENTED(); 39 return -1; 40 } 41 } 42 43 #ifdef ENABLE_DISASSEMBLER 44 45 // static 46 const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) { 47 switch (code) { 48 case kRbpDwarfCode: 49 return "rbp"; 50 case kRspDwarfCode: 51 return "rsp"; 52 case kRipDwarfCode: 53 return "rip"; 54 default: 55 UNIMPLEMENTED(); 56 return nullptr; 57 } 58 } 59 60 #endif 61 62 } // namespace internal 63 } // namespace v8 64
