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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
//===-- MipsELFObjectWriter.cpp - Mips ELF Writer -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/MipsBaseInfo.h"
#include "MCTargetDesc/MipsFixupKinds.h"
#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include <list>
using namespace llvm;
namespace {
class MipsELFObjectWriter : public MCELFObjectTargetWriter {
public:
MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
bool _isN64, bool IsLittleEndian);
virtual ~MipsELFObjectWriter();
unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
bool IsPCRel) const override;
bool needsRelocateWithSymbol(const MCSymbolData &SD,
unsigned Type) const override;
};
}
MipsELFObjectWriter::MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
bool _isN64, bool IsLittleEndian)
: MCELFObjectTargetWriter(_is64Bit, OSABI, ELF::EM_MIPS,
/*HasRelocationAddend*/ _isN64,
/*IsN64*/ _isN64) {}
MipsELFObjectWriter::~MipsELFObjectWriter() {}
unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
// determine the type of the relocation
unsigned Type = (unsigned)ELF::R_MIPS_NONE;
unsigned Kind = (unsigned)Fixup.getKind();
switch (Kind) {
default:
llvm_unreachable("invalid fixup kind!");
case Mips::fixup_Mips_32:
case FK_Data_4:
Type = ELF::R_MIPS_32;
break;
case Mips::fixup_Mips_64:
case FK_Data_8:
Type = ELF::R_MIPS_64;
break;
case FK_GPRel_4:
if (isN64()) {
Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
}
else
Type = ELF::R_MIPS_GPREL32;
break;
case Mips::fixup_Mips_GPREL16:
Type = ELF::R_MIPS_GPREL16;
break;
case Mips::fixup_Mips_26:
Type = ELF::R_MIPS_26;
break;
case Mips::fixup_Mips_CALL16:
Type = ELF::R_MIPS_CALL16;
break;
case Mips::fixup_Mips_GOT_Global:
case Mips::fixup_Mips_GOT_Local:
Type = ELF::R_MIPS_GOT16;
break;
case Mips::fixup_Mips_HI16:
Type = ELF::R_MIPS_HI16;
break;
case Mips::fixup_Mips_LO16:
Type = ELF::R_MIPS_LO16;
break;
case Mips::fixup_Mips_TLSGD:
Type = ELF::R_MIPS_TLS_GD;
break;
case Mips::fixup_Mips_GOTTPREL:
Type = ELF::R_MIPS_TLS_GOTTPREL;
break;
case Mips::fixup_Mips_TPREL_HI:
Type = ELF::R_MIPS_TLS_TPREL_HI16;
break;
case Mips::fixup_Mips_TPREL_LO:
Type = ELF::R_MIPS_TLS_TPREL_LO16;
break;
case Mips::fixup_Mips_TLSLDM:
Type = ELF::R_MIPS_TLS_LDM;
break;
case Mips::fixup_Mips_DTPREL_HI:
Type = ELF::R_MIPS_TLS_DTPREL_HI16;
break;
case Mips::fixup_Mips_DTPREL_LO:
Type = ELF::R_MIPS_TLS_DTPREL_LO16;
break;
case Mips::fixup_Mips_Branch_PCRel:
case Mips::fixup_Mips_PC16:
Type = ELF::R_MIPS_PC16;
break;
case Mips::fixup_Mips_GOT_PAGE:
Type = ELF::R_MIPS_GOT_PAGE;
break;
case Mips::fixup_Mips_GOT_OFST:
Type = ELF::R_MIPS_GOT_OFST;
break;
case Mips::fixup_Mips_GOT_DISP:
Type = ELF::R_MIPS_GOT_DISP;
break;
case Mips::fixup_Mips_GPOFF_HI:
Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type);
break;
case Mips::fixup_Mips_GPOFF_LO:
Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type);
break;
case Mips::fixup_Mips_HIGHER:
Type = ELF::R_MIPS_HIGHER;
break;
case Mips::fixup_Mips_HIGHEST:
Type = ELF::R_MIPS_HIGHEST;
break;
case Mips::fixup_Mips_GOT_HI16:
Type = ELF::R_MIPS_GOT_HI16;
break;
case Mips::fixup_Mips_GOT_LO16:
Type = ELF::R_MIPS_GOT_LO16;
break;
case Mips::fixup_Mips_CALL_HI16:
Type = ELF::R_MIPS_CALL_HI16;
break;
case Mips::fixup_Mips_CALL_LO16:
Type = ELF::R_MIPS_CALL_LO16;
break;
case Mips::fixup_MICROMIPS_26_S1:
Type = ELF::R_MICROMIPS_26_S1;
break;
case Mips::fixup_MICROMIPS_HI16:
Type = ELF::R_MICROMIPS_HI16;
break;
case Mips::fixup_MICROMIPS_LO16:
Type = ELF::R_MICROMIPS_LO16;
break;
case Mips::fixup_MICROMIPS_GOT16:
Type = ELF::R_MICROMIPS_GOT16;
break;
case Mips::fixup_MICROMIPS_PC7_S1:
Type = ELF::R_MICROMIPS_PC7_S1;
break;
case Mips::fixup_MICROMIPS_PC10_S1:
Type = ELF::R_MICROMIPS_PC10_S1;
break;
case Mips::fixup_MICROMIPS_PC16_S1:
Type = ELF::R_MICROMIPS_PC16_S1;
break;
case Mips::fixup_MICROMIPS_CALL16:
Type = ELF::R_MICROMIPS_CALL16;
break;
case Mips::fixup_MICROMIPS_GOT_DISP:
Type = ELF::R_MICROMIPS_GOT_DISP;
break;
case Mips::fixup_MICROMIPS_GOT_PAGE:
Type = ELF::R_MICROMIPS_GOT_PAGE;
break;
case Mips::fixup_MICROMIPS_GOT_OFST:
Type = ELF::R_MICROMIPS_GOT_OFST;
break;
case Mips::fixup_MICROMIPS_TLS_GD:
Type = ELF::R_MICROMIPS_TLS_GD;
break;
case Mips::fixup_MICROMIPS_TLS_LDM:
Type = ELF::R_MICROMIPS_TLS_LDM;
break;
case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16:
Type = ELF::R_MICROMIPS_TLS_DTPREL_HI16;
break;
case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16:
Type = ELF::R_MICROMIPS_TLS_DTPREL_LO16;
break;
case Mips::fixup_MICROMIPS_TLS_TPREL_HI16:
Type = ELF::R_MICROMIPS_TLS_TPREL_HI16;
break;
case Mips::fixup_MICROMIPS_TLS_TPREL_LO16:
Type = ELF::R_MICROMIPS_TLS_TPREL_LO16;
break;
case Mips::fixup_MIPS_PC19_S2:
Type = ELF::R_MIPS_PC19_S2;
break;
case Mips::fixup_MIPS_PC18_S3:
Type = ELF::R_MIPS_PC18_S3;
break;
case Mips::fixup_MIPS_PC21_S2:
Type = ELF::R_MIPS_PC21_S2;
break;
case Mips::fixup_MIPS_PC26_S2:
Type = ELF::R_MIPS_PC26_S2;
break;
case Mips::fixup_MIPS_PCHI16:
Type = ELF::R_MIPS_PCHI16;
break;
case Mips::fixup_MIPS_PCLO16:
Type = ELF::R_MIPS_PCLO16;
break;
}
return Type;
}
bool
MipsELFObjectWriter::needsRelocateWithSymbol(const MCSymbolData &SD,
unsigned Type) const {
// FIXME: This is extremely conservative. This really needs to use a
// whitelist with a clear explanation for why each realocation needs to
// point to the symbol, not to the section.
switch (Type) {
default:
return true;
case ELF::R_MIPS_GOT16:
case ELF::R_MIPS16_GOT16:
case ELF::R_MICROMIPS_GOT16:
llvm_unreachable("Should have been handled already");
// These relocations might be paired with another relocation. The pairing is
// done by the static linker by matching the symbol. Since we only see one
// relocation at a time, we have to force them to relocate with a symbol to
// avoid ending up with a pair where one points to a section and another
// points to a symbol.
case ELF::R_MIPS_HI16:
case ELF::R_MIPS16_HI16:
case ELF::R_MICROMIPS_HI16:
case ELF::R_MIPS_LO16:
case ELF::R_MIPS16_LO16:
case ELF::R_MICROMIPS_LO16:
return true;
case ELF::R_MIPS_32:
if (MCELF::getOther(SD) & (ELF::STO_MIPS_MICROMIPS >> 2))
return true;
// falltrough
case ELF::R_MIPS_26:
case ELF::R_MIPS_64:
case ELF::R_MIPS_GPREL16:
return false;
}
}
MCObjectWriter *llvm::createMipsELFObjectWriter(raw_ostream &OS, uint8_t OSABI,
bool IsLittleEndian,
bool Is64Bit) {
MCELFObjectTargetWriter *MOTW =
new MipsELFObjectWriter(Is64Bit, OSABI, Is64Bit, IsLittleEndian);
return createELFObjectWriter(MOTW, OS, IsLittleEndian);
}
|
