1 //===-- X86ELFObjectWriter.cpp - X86 ELF Writer ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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"
21 class X86ELFObjectWriter : public MCELFObjectTargetWriter {
23 X86ELFObjectWriter(bool IsELF64, uint8_t OSABI, uint16_t EMachine);
25 virtual ~X86ELFObjectWriter();
27 virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
28 bool IsPCRel, bool IsRelocWithSymbol,
29 int64_t Addend) const;
33 X86ELFObjectWriter::X86ELFObjectWriter(bool IsELF64, uint8_t OSABI,
35 : MCELFObjectTargetWriter(IsELF64, OSABI, EMachine,
36 // Only i386 uses Rel instead of RelA.
37 /*HasRelocationAddend*/ EMachine != ELF::EM_386) {}
39 X86ELFObjectWriter::~X86ELFObjectWriter()
42 unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
45 bool IsRelocWithSymbol,
46 int64_t Addend) const {
47 // determine the type of the relocation
49 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
50 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
52 if (getEMachine() == ELF::EM_X86_64) {
54 switch ((unsigned)Fixup.getKind()) {
55 default: llvm_unreachable("invalid fixup kind!");
57 case FK_Data_8: Type = ELF::R_X86_64_PC64; break;
58 case FK_Data_4: Type = ELF::R_X86_64_PC32; break;
59 case FK_Data_2: Type = ELF::R_X86_64_PC16; break;
60 case FK_Data_1: Type = ELF::R_X86_64_PC8; break;
63 assert(Modifier == MCSymbolRefExpr::VK_None);
64 Type = ELF::R_X86_64_PC64;
66 case X86::reloc_signed_4byte:
67 case X86::reloc_riprel_4byte_movq_load:
68 case X86::reloc_riprel_4byte:
72 llvm_unreachable("Unimplemented");
73 case MCSymbolRefExpr::VK_None:
74 Type = ELF::R_X86_64_PC32;
76 case MCSymbolRefExpr::VK_PLT:
77 Type = ELF::R_X86_64_PLT32;
79 case MCSymbolRefExpr::VK_GOTPCREL:
80 Type = ELF::R_X86_64_GOTPCREL;
82 case MCSymbolRefExpr::VK_GOTTPOFF:
83 Type = ELF::R_X86_64_GOTTPOFF;
85 case MCSymbolRefExpr::VK_TLSGD:
86 Type = ELF::R_X86_64_TLSGD;
88 case MCSymbolRefExpr::VK_TLSLD:
89 Type = ELF::R_X86_64_TLSLD;
94 assert(Modifier == MCSymbolRefExpr::VK_None);
95 Type = ELF::R_X86_64_PC16;
98 assert(Modifier == MCSymbolRefExpr::VK_None);
99 Type = ELF::R_X86_64_PC8;
103 switch ((unsigned)Fixup.getKind()) {
104 default: llvm_unreachable("invalid fixup kind!");
108 llvm_unreachable("Unimplemented");
109 case MCSymbolRefExpr::VK_None:
110 Type = ELF::R_X86_64_64;
112 case MCSymbolRefExpr::VK_GOT:
113 Type = ELF::R_X86_64_GOT64;
115 case MCSymbolRefExpr::VK_GOTOFF:
116 Type = ELF::R_X86_64_GOTOFF64;
118 case MCSymbolRefExpr::VK_TPOFF:
119 Type = ELF::R_X86_64_TPOFF64;
121 case MCSymbolRefExpr::VK_DTPOFF:
122 Type = ELF::R_X86_64_DTPOFF64;
126 case X86::reloc_signed_4byte:
129 llvm_unreachable("Unimplemented");
130 case MCSymbolRefExpr::VK_None:
131 Type = ELF::R_X86_64_32S;
133 case MCSymbolRefExpr::VK_GOT:
134 Type = ELF::R_X86_64_GOT32;
136 case MCSymbolRefExpr::VK_GOTPCREL:
137 Type = ELF::R_X86_64_GOTPCREL;
139 case MCSymbolRefExpr::VK_TPOFF:
140 Type = ELF::R_X86_64_TPOFF32;
142 case MCSymbolRefExpr::VK_DTPOFF:
143 Type = ELF::R_X86_64_DTPOFF32;
148 Type = ELF::R_X86_64_32;
150 case FK_Data_2: Type = ELF::R_X86_64_16; break;
152 case FK_Data_1: Type = ELF::R_X86_64_8; break;
155 } else if (getEMachine() == ELF::EM_386) {
157 switch ((unsigned)Fixup.getKind()) {
158 default: llvm_unreachable("invalid fixup kind!");
160 case X86::reloc_global_offset_table:
161 Type = ELF::R_386_GOTPC;
168 llvm_unreachable("Unimplemented");
169 case MCSymbolRefExpr::VK_None:
170 Type = ELF::R_386_PC8;
179 llvm_unreachable("Unimplemented");
180 case MCSymbolRefExpr::VK_None:
181 Type = ELF::R_386_PC16;
186 case X86::reloc_signed_4byte:
191 llvm_unreachable("Unimplemented");
192 case MCSymbolRefExpr::VK_None:
193 Type = ELF::R_386_PC32;
195 case MCSymbolRefExpr::VK_PLT:
196 Type = ELF::R_386_PLT32;
202 switch ((unsigned)Fixup.getKind()) {
203 default: llvm_unreachable("invalid fixup kind!");
205 case X86::reloc_global_offset_table:
206 Type = ELF::R_386_GOTPC;
209 // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
211 case X86::reloc_signed_4byte:
216 llvm_unreachable("Unimplemented");
217 case MCSymbolRefExpr::VK_None:
218 Type = ELF::R_386_32;
220 case MCSymbolRefExpr::VK_GOT:
221 Type = ELF::R_386_GOT32;
223 case MCSymbolRefExpr::VK_GOTOFF:
224 Type = ELF::R_386_GOTOFF;
226 case MCSymbolRefExpr::VK_TLSGD:
227 Type = ELF::R_386_TLS_GD;
229 case MCSymbolRefExpr::VK_TPOFF:
230 Type = ELF::R_386_TLS_LE_32;
232 case MCSymbolRefExpr::VK_INDNTPOFF:
233 Type = ELF::R_386_TLS_IE;
235 case MCSymbolRefExpr::VK_NTPOFF:
236 Type = ELF::R_386_TLS_LE;
238 case MCSymbolRefExpr::VK_GOTNTPOFF:
239 Type = ELF::R_386_TLS_GOTIE;
241 case MCSymbolRefExpr::VK_TLSLDM:
242 Type = ELF::R_386_TLS_LDM;
244 case MCSymbolRefExpr::VK_DTPOFF:
245 Type = ELF::R_386_TLS_LDO_32;
247 case MCSymbolRefExpr::VK_GOTTPOFF:
248 Type = ELF::R_386_TLS_IE_32;
252 case FK_Data_2: Type = ELF::R_386_16; break;
254 case FK_Data_1: Type = ELF::R_386_8; break;
258 llvm_unreachable("Unsupported ELF machine type.");
263 MCObjectWriter *llvm::createX86ELFObjectWriter(raw_ostream &OS,
267 MCELFObjectTargetWriter *MOTW =
268 new X86ELFObjectWriter(IsELF64, OSABI, EMachine);
269 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);