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 kR0DwarfCode = 0;
11 static const int kFpDwarfCode = 11;
12 static const int kSpDwarfCode = 13;
13 static const int kLrDwarfCode = 14;
14 
15 const int EhFrameConstants::kCodeAlignmentFactor = 4;
16 const int EhFrameConstants::kDataAlignmentFactor = -4;
17 
WriteReturnAddressRegisterCode()18 void EhFrameWriter::WriteReturnAddressRegisterCode() {
19   WriteULeb128(kLrDwarfCode);
20 }
21 
WriteInitialStateInCie()22 void EhFrameWriter::WriteInitialStateInCie() {
23   SetBaseAddressRegisterAndOffset(fp, 0);
24   RecordRegisterNotModified(lr);
25 }
26 
27 // static
RegisterToDwarfCode(Register name)28 int EhFrameWriter::RegisterToDwarfCode(Register name) {
29   switch (name.code()) {
30     case kRegCode_fp:
31       return kFpDwarfCode;
32     case kRegCode_sp:
33       return kSpDwarfCode;
34     case kRegCode_lr:
35       return kLrDwarfCode;
36     case kRegCode_r0:
37       return kR0DwarfCode;
38     default:
39       UNIMPLEMENTED();
40       return -1;
41   }
42 }
43 
44 #ifdef ENABLE_DISASSEMBLER
45 
46 // static
DwarfRegisterCodeToString(int code)47 const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
48   switch (code) {
49     case kFpDwarfCode:
50       return "fp";
51     case kSpDwarfCode:
52       return "sp";
53     case kLrDwarfCode:
54       return "lr";
55     default:
56       UNIMPLEMENTED();
57       return nullptr;
58   }
59 }
60 
61 #endif
62 
63 }  // namespace internal
64 }  // namespace v8
65