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gerrit-public.fairphone.software / platform / external / llvm / edae8e1e4d5bd9b59f18ecef04a248be95d8ca46 / . / lib / Target / X86 / MCTargetDesc / X86ELFObjectWriter.cpp
blob: 5a42a801825d05ccba164762cb8ba070ec583afe [file] [log] [blame]
Rafael Espindolaedae8e12011-12-21 17:30:17 +0000[diff] [blame^]1//===-- X86ELFObjectWriter.cpp - X86 ELF Writer ---------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "MCTargetDesc/X86FixupKinds.h"
11#include "MCTargetDesc/X86MCTargetDesc.h"
12#include "llvm/MC/MCELFObjectWriter.h"
13#include "llvm/MC/MCExpr.h"
14#include "llvm/MC/MCValue.h"
15#include "llvm/Support/ELF.h"
16#include "llvm/Support/ErrorHandling.h"
17
18using namespace llvm;
19
20namespace {
21 class X86ELFObjectWriter : public MCELFObjectTargetWriter {
22 public:
23 X86ELFObjectWriter(bool is64Bit, uint8_t OSABI);
24
25 virtual ~X86ELFObjectWriter();
26 protected:
27 virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
28 bool IsPCRel, bool IsRelocWithSymbol,
29 int64_t Addend) const;
30 };
31}
32
33X86ELFObjectWriter::X86ELFObjectWriter(bool Is64Bit, uint8_t OSABI)
34 : MCELFObjectTargetWriter(Is64Bit, OSABI,
35 Is64Bit ? ELF::EM_X86_64 : ELF::EM_386,
36 /*HasRelocationAddend*/ Is64Bit) {}
37
38X86ELFObjectWriter::~X86ELFObjectWriter()
39{}
40
41unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
42 const MCFixup &Fixup,
43 bool IsPCRel,
44 bool IsRelocWithSymbol,
45 int64_t Addend) const {
46 // determine the type of the relocation
47
48 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
49 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
50 unsigned Type;
51 if (is64Bit()) {
52 if (IsPCRel) {
53 switch ((unsigned)Fixup.getKind()) {
54 default: llvm_unreachable("invalid fixup kind!");
55
56 case FK_Data_8: Type = ELF::R_X86_64_PC64; break;
57 case FK_Data_4: Type = ELF::R_X86_64_PC32; break;
58 case FK_Data_2: Type = ELF::R_X86_64_PC16; break;
59
60 case FK_PCRel_8:
61 assert(Modifier == MCSymbolRefExpr::VK_None);
62 Type = ELF::R_X86_64_PC64;
63 break;
64 case X86::reloc_signed_4byte:
65 case X86::reloc_riprel_4byte_movq_load:
66 case X86::reloc_riprel_4byte:
67 case FK_PCRel_4:
68 switch (Modifier) {
69 default:
70 llvm_unreachable("Unimplemented");
71 case MCSymbolRefExpr::VK_None:
72 Type = ELF::R_X86_64_PC32;
73 break;
74 case MCSymbolRefExpr::VK_PLT:
75 Type = ELF::R_X86_64_PLT32;
76 break;
77 case MCSymbolRefExpr::VK_GOTPCREL:
78 Type = ELF::R_X86_64_GOTPCREL;
79 break;
80 case MCSymbolRefExpr::VK_GOTTPOFF:
81 Type = ELF::R_X86_64_GOTTPOFF;
82 break;
83 case MCSymbolRefExpr::VK_TLSGD:
84 Type = ELF::R_X86_64_TLSGD;
85 break;
86 case MCSymbolRefExpr::VK_TLSLD:
87 Type = ELF::R_X86_64_TLSLD;
88 break;
89 }
90 break;
91 case FK_PCRel_2:
92 assert(Modifier == MCSymbolRefExpr::VK_None);
93 Type = ELF::R_X86_64_PC16;
94 break;
95 case FK_PCRel_1:
96 assert(Modifier == MCSymbolRefExpr::VK_None);
97 Type = ELF::R_X86_64_PC8;
98 break;
99 }
100 } else {
101 switch ((unsigned)Fixup.getKind()) {
102 default: llvm_unreachable("invalid fixup kind!");
103 case FK_Data_8: Type = ELF::R_X86_64_64; break;
104 case X86::reloc_signed_4byte:
105 switch (Modifier) {
106 default:
107 llvm_unreachable("Unimplemented");
108 case MCSymbolRefExpr::VK_None:
109 Type = ELF::R_X86_64_32S;
110 break;
111 case MCSymbolRefExpr::VK_GOT:
112 Type = ELF::R_X86_64_GOT32;
113 break;
114 case MCSymbolRefExpr::VK_GOTPCREL:
115 Type = ELF::R_X86_64_GOTPCREL;
116 break;
117 case MCSymbolRefExpr::VK_TPOFF:
118 Type = ELF::R_X86_64_TPOFF32;
119 break;
120 case MCSymbolRefExpr::VK_DTPOFF:
121 Type = ELF::R_X86_64_DTPOFF32;
122 break;
123 }
124 break;
125 case FK_Data_4:
126 Type = ELF::R_X86_64_32;
127 break;
128 case FK_Data_2: Type = ELF::R_X86_64_16; break;
129 case FK_PCRel_1:
130 case FK_Data_1: Type = ELF::R_X86_64_8; break;
131 }
132 }
133 } else {
134 if (IsPCRel) {
135 switch ((unsigned)Fixup.getKind()) {
136 default: llvm_unreachable("invalid fixup kind!");
137
138 case X86::reloc_global_offset_table:
139 Type = ELF::R_386_GOTPC;
140 break;
141
142 case X86::reloc_signed_4byte:
143 case FK_PCRel_4:
144 case FK_Data_4:
145 switch (Modifier) {
146 default:
147 llvm_unreachable("Unimplemented");
148 case MCSymbolRefExpr::VK_None:
149 Type = ELF::R_386_PC32;
150 break;
151 case MCSymbolRefExpr::VK_PLT:
152 Type = ELF::R_386_PLT32;
153 break;
154 }
155 break;
156 }
157 } else {
158 switch ((unsigned)Fixup.getKind()) {
159 default: llvm_unreachable("invalid fixup kind!");
160
161 case X86::reloc_global_offset_table:
162 Type = ELF::R_386_GOTPC;
163 break;
164
165 // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
166 // instead?
167 case X86::reloc_signed_4byte:
168 case FK_PCRel_4:
169 case FK_Data_4:
170 switch (Modifier) {
171 default:
172 llvm_unreachable("Unimplemented");
173 case MCSymbolRefExpr::VK_None:
174 Type = ELF::R_386_32;
175 break;
176 case MCSymbolRefExpr::VK_GOT:
177 Type = ELF::R_386_GOT32;
178 break;
179 case MCSymbolRefExpr::VK_GOTOFF:
180 Type = ELF::R_386_GOTOFF;
181 break;
182 case MCSymbolRefExpr::VK_TLSGD:
183 Type = ELF::R_386_TLS_GD;
184 break;
185 case MCSymbolRefExpr::VK_TPOFF:
186 Type = ELF::R_386_TLS_LE_32;
187 break;
188 case MCSymbolRefExpr::VK_INDNTPOFF:
189 Type = ELF::R_386_TLS_IE;
190 break;
191 case MCSymbolRefExpr::VK_NTPOFF:
192 Type = ELF::R_386_TLS_LE;
193 break;
194 case MCSymbolRefExpr::VK_GOTNTPOFF:
195 Type = ELF::R_386_TLS_GOTIE;
196 break;
197 case MCSymbolRefExpr::VK_TLSLDM:
198 Type = ELF::R_386_TLS_LDM;
199 break;
200 case MCSymbolRefExpr::VK_DTPOFF:
201 Type = ELF::R_386_TLS_LDO_32;
202 break;
203 case MCSymbolRefExpr::VK_GOTTPOFF:
204 Type = ELF::R_386_TLS_IE_32;
205 break;
206 }
207 break;
208 case FK_Data_2: Type = ELF::R_386_16; break;
209 case FK_PCRel_1:
210 case FK_Data_1: Type = ELF::R_386_8; break;
211 }
212 }
213 }
214
215 return Type;
216}
217
218MCObjectWriter *llvm::createX86ELFObjectWriter(raw_ostream &OS,
219 bool Is64Bit,
220 uint8_t OSABI) {
221 MCELFObjectTargetWriter *MOTW =
222 new X86ELFObjectWriter(Is64Bit, OSABI);
223 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);
224}