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/codegen/arm64/assembler-arm64-inl.h"
6 #include "src/diagnostics/eh-frame.h"
7 
8 namespace v8 {
9 namespace internal {
10 
11 static const int kX0DwarfCode = 0;
12 static const int kFpDwarfCode = 29;
13 static const int kLrDwarfCode = 30;
14 static const int kSpDwarfCode = 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 kRegCode_x29:
32       return kFpDwarfCode;
33     case kRegCode_x30:
34       return kLrDwarfCode;
35     case kSPRegInternalCode:
36       return kSpDwarfCode;
37     case kRegCode_x0:
38       return kX0DwarfCode;
39     default:
40       UNIMPLEMENTED();
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 kLrDwarfCode:
52       return "lr";
53     case kSpDwarfCode:
54       return "sp";  // This could be zr as well
55     default:
56       UNIMPLEMENTED();
57   }
58 }
59 
60 #endif
61 
62 }  // namespace internal
63 }  // namespace v8
64