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 kX0DwarfCode = 0;
11 static const int kJsSpDwarfCode = 28;
12 static const int kFpDwarfCode = 29;
13 static const int kLrDwarfCode = 30;
14 static const int kCSpDwarfCode = 31;
15 
16 const int EhFrameConstants::kCodeAlignmentFactor = 4;
17 const int EhFrameConstants::kDataAlignmentFactor = -8;
18 
WriteReturnAddressRegisterCode()19 void EhFrameWriter::WriteReturnAddressRegisterCode() {
20   WriteULeb128(kLrDwarfCode);
21 }
22 
WriteInitialStateInCie()23 void EhFrameWriter::WriteInitialStateInCie() {
24   SetBaseAddressRegisterAndOffset(x29, 0);
25   RecordRegisterNotModified(x30);
26 }
27 
28 // static
RegisterToDwarfCode(Register name)29 int EhFrameWriter::RegisterToDwarfCode(Register name) {
30   switch (name.code()) {
31     case Register::kCode_x28:
32       return kJsSpDwarfCode;
33     case Register::kCode_x29:
34       return kFpDwarfCode;
35     case Register::kCode_x30:
36       return kLrDwarfCode;
37     case Register::kCode_x31:
38       return kCSpDwarfCode;
39     case Register::kCode_x0:
40       return kX0DwarfCode;
41     default:
42       UNIMPLEMENTED();
43       return -1;
44   }
45 }
46 
47 #ifdef ENABLE_DISASSEMBLER
48 
49 // static
DwarfRegisterCodeToString(int code)50 const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
51   switch (code) {
52     case kFpDwarfCode:
53       return "fp";
54     case kLrDwarfCode:
55       return "lr";
56     case kJsSpDwarfCode:
57       return "jssp";
58     case kCSpDwarfCode:
59       return "csp";  // This could be zr as well
60     default:
61       UNIMPLEMENTED();
62       return nullptr;
63   }
64 }
65 
66 #endif
67 
68 }  // namespace internal
69 }  // namespace v8
70