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 unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
28 bool IsPCRel, bool IsRelocWithSymbol) const override;
32 X86ELFObjectWriter::X86ELFObjectWriter(bool IsELF64, uint8_t OSABI,
34 : MCELFObjectTargetWriter(IsELF64, OSABI, EMachine,
35 // Only i386 uses Rel instead of RelA.
36 /*HasRelocationAddend*/ EMachine != ELF::EM_386) {}
38 X86ELFObjectWriter::~X86ELFObjectWriter()
41 unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
44 bool IsRelocWithSymbol) const {
45 // determine the type of the relocation
47 MCSymbolRefExpr::VariantKind Modifier = Fixup.getAccessVariant();
49 if (getEMachine() == ELF::EM_X86_64) {
51 switch ((unsigned)Fixup.getKind()) {
52 default: llvm_unreachable("invalid fixup kind!");
54 case FK_Data_8: Type = ELF::R_X86_64_PC64; break;
55 case FK_Data_4: Type = ELF::R_X86_64_PC32; break;
56 case FK_Data_2: Type = ELF::R_X86_64_PC16; break;
57 case FK_Data_1: Type = ELF::R_X86_64_PC8; break;
60 assert(Modifier == MCSymbolRefExpr::VK_None);
61 Type = ELF::R_X86_64_PC64;
63 case X86::reloc_signed_4byte:
64 case X86::reloc_riprel_4byte_movq_load:
65 case X86::reloc_riprel_4byte:
69 llvm_unreachable("Unimplemented");
70 case MCSymbolRefExpr::VK_None:
71 Type = ELF::R_X86_64_PC32;
73 case MCSymbolRefExpr::VK_PLT:
74 Type = ELF::R_X86_64_PLT32;
76 case MCSymbolRefExpr::VK_GOTPCREL:
77 Type = ELF::R_X86_64_GOTPCREL;
79 case MCSymbolRefExpr::VK_GOTTPOFF:
80 Type = ELF::R_X86_64_GOTTPOFF;
82 case MCSymbolRefExpr::VK_TLSGD:
83 Type = ELF::R_X86_64_TLSGD;
85 case MCSymbolRefExpr::VK_TLSLD:
86 Type = ELF::R_X86_64_TLSLD;
91 assert(Modifier == MCSymbolRefExpr::VK_None);
92 Type = ELF::R_X86_64_PC16;
95 assert(Modifier == MCSymbolRefExpr::VK_None);
96 Type = ELF::R_X86_64_PC8;
100 switch ((unsigned)Fixup.getKind()) {
101 default: llvm_unreachable("invalid fixup kind!");
105 llvm_unreachable("Unimplemented");
106 case MCSymbolRefExpr::VK_None:
107 Type = ELF::R_X86_64_64;
109 case MCSymbolRefExpr::VK_GOT:
110 Type = ELF::R_X86_64_GOT64;
112 case MCSymbolRefExpr::VK_GOTOFF:
113 Type = ELF::R_X86_64_GOTOFF64;
115 case MCSymbolRefExpr::VK_TPOFF:
116 Type = ELF::R_X86_64_TPOFF64;
118 case MCSymbolRefExpr::VK_DTPOFF:
119 Type = ELF::R_X86_64_DTPOFF64;
123 case X86::reloc_signed_4byte:
126 llvm_unreachable("Unimplemented");
127 case MCSymbolRefExpr::VK_None:
128 Type = ELF::R_X86_64_32S;
130 case MCSymbolRefExpr::VK_GOT:
131 Type = ELF::R_X86_64_GOT32;
133 case MCSymbolRefExpr::VK_GOTPCREL:
134 Type = ELF::R_X86_64_GOTPCREL;
136 case MCSymbolRefExpr::VK_TPOFF:
137 Type = ELF::R_X86_64_TPOFF32;
139 case MCSymbolRefExpr::VK_DTPOFF:
140 Type = ELF::R_X86_64_DTPOFF32;
145 Type = ELF::R_X86_64_32;
147 case FK_Data_2: Type = ELF::R_X86_64_16; break;
149 case FK_Data_1: Type = ELF::R_X86_64_8; break;
152 } else if (getEMachine() == ELF::EM_386) {
154 switch ((unsigned)Fixup.getKind()) {
155 default: llvm_unreachable("invalid fixup kind!");
157 case X86::reloc_global_offset_table:
158 Type = ELF::R_386_GOTPC;
165 llvm_unreachable("Unimplemented");
166 case MCSymbolRefExpr::VK_None:
167 Type = ELF::R_386_PC8;
176 llvm_unreachable("Unimplemented");
177 case MCSymbolRefExpr::VK_None:
178 Type = ELF::R_386_PC16;
183 case X86::reloc_signed_4byte:
188 llvm_unreachable("Unimplemented");
189 case MCSymbolRefExpr::VK_None:
190 Type = ELF::R_386_PC32;
192 case MCSymbolRefExpr::VK_PLT:
193 Type = ELF::R_386_PLT32;
199 switch ((unsigned)Fixup.getKind()) {
200 default: llvm_unreachable("invalid fixup kind!");
202 case X86::reloc_global_offset_table:
203 Type = ELF::R_386_GOTPC;
206 // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
208 case X86::reloc_signed_4byte:
213 llvm_unreachable("Unimplemented");
214 case MCSymbolRefExpr::VK_None:
215 Type = ELF::R_386_32;
217 case MCSymbolRefExpr::VK_GOT:
218 Type = ELF::R_386_GOT32;
220 case MCSymbolRefExpr::VK_GOTOFF:
221 Type = ELF::R_386_GOTOFF;
223 case MCSymbolRefExpr::VK_TLSGD:
224 Type = ELF::R_386_TLS_GD;
226 case MCSymbolRefExpr::VK_TPOFF:
227 Type = ELF::R_386_TLS_LE_32;
229 case MCSymbolRefExpr::VK_INDNTPOFF:
230 Type = ELF::R_386_TLS_IE;
232 case MCSymbolRefExpr::VK_NTPOFF:
233 Type = ELF::R_386_TLS_LE;
235 case MCSymbolRefExpr::VK_GOTNTPOFF:
236 Type = ELF::R_386_TLS_GOTIE;
238 case MCSymbolRefExpr::VK_TLSLDM:
239 Type = ELF::R_386_TLS_LDM;
241 case MCSymbolRefExpr::VK_DTPOFF:
242 Type = ELF::R_386_TLS_LDO_32;
244 case MCSymbolRefExpr::VK_GOTTPOFF:
245 Type = ELF::R_386_TLS_IE_32;
249 case FK_Data_2: Type = ELF::R_386_16; break;
251 case FK_Data_1: Type = ELF::R_386_8; break;
255 llvm_unreachable("Unsupported ELF machine type.");
260 MCObjectWriter *llvm::createX86ELFObjectWriter(raw_ostream &OS,
264 MCELFObjectTargetWriter *MOTW =
265 new X86ELFObjectWriter(IsELF64, OSABI, EMachine);
266 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);