blob: c1a49a764614dd0c8b354c9a3a9576e36d9b8ba6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
//===-- X86ELFWriterInfo.cpp - ELF Writer Info for the X86 backend --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements ELF writer information for the X86 backend.
//
//===----------------------------------------------------------------------===//
#include "X86ELFWriterInfo.h"
#include "X86Relocations.h"
#include "llvm/Function.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Implementation of the X86ELFWriterInfo class
//===----------------------------------------------------------------------===//
X86ELFWriterInfo::X86ELFWriterInfo(bool is64Bit_, bool isLittleEndian_)
: TargetELFWriterInfo(is64Bit_, isLittleEndian_) {
EMachine = is64Bit ? EM_X86_64 : EM_386;
}
X86ELFWriterInfo::~X86ELFWriterInfo() {}
unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
if (is64Bit) {
switch(MachineRelTy) {
case X86::reloc_pcrel_word:
return ELF::R_X86_64_PC32;
case X86::reloc_absolute_word:
return ELF::R_X86_64_32;
case X86::reloc_absolute_word_sext:
return ELF::R_X86_64_32S;
case X86::reloc_absolute_dword:
return ELF::R_X86_64_64;
case X86::reloc_picrel_word:
default:
llvm_unreachable("unknown x86_64 machine relocation type");
}
} else {
switch(MachineRelTy) {
case X86::reloc_pcrel_word:
return ELF::R_386_PC32;
case X86::reloc_absolute_word:
return ELF::R_386_32;
case X86::reloc_absolute_word_sext:
case X86::reloc_absolute_dword:
case X86::reloc_picrel_word:
default:
llvm_unreachable("unknown x86 machine relocation type");
}
}
}
long int X86ELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
long int Modifier) const {
if (is64Bit) {
switch(RelTy) {
case ELF::R_X86_64_PC32: return Modifier - 4;
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
case ELF::R_X86_64_64:
return Modifier;
default:
llvm_unreachable("unknown x86_64 relocation type");
}
} else {
switch(RelTy) {
case ELF::R_386_PC32: return Modifier - 4;
case ELF::R_386_32: return Modifier;
default:
llvm_unreachable("unknown x86 relocation type");
}
}
}
unsigned X86ELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
if (is64Bit) {
switch(RelTy) {
case ELF::R_X86_64_PC32:
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
return 32;
case ELF::R_X86_64_64:
return 64;
default:
llvm_unreachable("unknown x86_64 relocation type");
}
} else {
switch(RelTy) {
case ELF::R_386_PC32:
case ELF::R_386_32:
return 32;
default:
llvm_unreachable("unknown x86 relocation type");
}
}
}
bool X86ELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
if (is64Bit) {
switch(RelTy) {
case ELF::R_X86_64_PC32:
return true;
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
case ELF::R_X86_64_64:
return false;
default:
llvm_unreachable("unknown x86_64 relocation type");
}
} else {
switch(RelTy) {
case ELF::R_386_PC32:
return true;
case ELF::R_386_32:
return false;
default:
llvm_unreachable("unknown x86 relocation type");
}
}
}
unsigned X86ELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
return is64Bit ?
X86::reloc_absolute_dword : X86::reloc_absolute_word;
}
long int X86ELFWriterInfo::computeRelocation(unsigned SymOffset,
unsigned RelOffset,
unsigned RelTy) const {
if (RelTy == ELF::R_X86_64_PC32 || RelTy == ELF::R_386_PC32)
return SymOffset - (RelOffset + 4);
llvm_unreachable("computeRelocation unknown for this relocation type");
}
|
