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) 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 // determine the type of the relocation
46 MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
48 if (getEMachine() == ELF::EM_X86_64) {
50 switch ((unsigned)Fixup.getKind()) {
51 default: llvm_unreachable("invalid fixup kind!");
53 case FK_Data_8: Type = ELF::R_X86_64_PC64; break;
54 case FK_Data_4: Type = ELF::R_X86_64_PC32; break;
55 case FK_Data_2: Type = ELF::R_X86_64_PC16; break;
56 case FK_Data_1: Type = ELF::R_X86_64_PC8; break;
59 assert(Modifier == MCSymbolRefExpr::VK_None);
60 Type = ELF::R_X86_64_PC64;
62 case X86::reloc_signed_4byte:
63 case X86::reloc_riprel_4byte_movq_load:
64 case X86::reloc_riprel_4byte:
68 llvm_unreachable("Unimplemented");
69 case MCSymbolRefExpr::VK_None:
70 Type = ELF::R_X86_64_PC32;
72 case MCSymbolRefExpr::VK_PLT:
73 Type = ELF::R_X86_64_PLT32;
75 case MCSymbolRefExpr::VK_GOTPCREL:
76 Type = ELF::R_X86_64_GOTPCREL;
78 case MCSymbolRefExpr::VK_GOTTPOFF:
79 Type = ELF::R_X86_64_GOTTPOFF;
81 case MCSymbolRefExpr::VK_TLSGD:
82 Type = ELF::R_X86_64_TLSGD;
84 case MCSymbolRefExpr::VK_TLSLD:
85 Type = ELF::R_X86_64_TLSLD;
90 assert(Modifier == MCSymbolRefExpr::VK_None);
91 Type = ELF::R_X86_64_PC16;
94 assert(Modifier == MCSymbolRefExpr::VK_None);
95 Type = ELF::R_X86_64_PC8;
99 switch ((unsigned)Fixup.getKind()) {
100 default: llvm_unreachable("invalid fixup kind!");
101 case X86::reloc_global_offset_table8:
102 Type = ELF::R_X86_64_GOTPC64;
104 case X86::reloc_global_offset_table:
105 Type = ELF::R_X86_64_GOTPC32;
110 llvm_unreachable("Unimplemented");
111 case MCSymbolRefExpr::VK_None:
112 Type = ELF::R_X86_64_64;
114 case MCSymbolRefExpr::VK_GOT:
115 Type = ELF::R_X86_64_GOT64;
117 case MCSymbolRefExpr::VK_GOTOFF:
118 Type = ELF::R_X86_64_GOTOFF64;
120 case MCSymbolRefExpr::VK_TPOFF:
121 Type = ELF::R_X86_64_TPOFF64;
123 case MCSymbolRefExpr::VK_DTPOFF:
124 Type = ELF::R_X86_64_DTPOFF64;
128 case X86::reloc_signed_4byte:
131 llvm_unreachable("Unimplemented");
132 case MCSymbolRefExpr::VK_None:
133 Type = ELF::R_X86_64_32S;
135 case MCSymbolRefExpr::VK_GOT:
136 Type = ELF::R_X86_64_GOT32;
138 case MCSymbolRefExpr::VK_GOTPCREL:
139 Type = ELF::R_X86_64_GOTPCREL;
141 case MCSymbolRefExpr::VK_TPOFF:
142 Type = ELF::R_X86_64_TPOFF32;
144 case MCSymbolRefExpr::VK_DTPOFF:
145 Type = ELF::R_X86_64_DTPOFF32;
150 Type = ELF::R_X86_64_32;
152 case FK_Data_2: Type = ELF::R_X86_64_16; break;
154 case FK_Data_1: Type = ELF::R_X86_64_8; break;
157 } else if (getEMachine() == ELF::EM_386) {
159 switch ((unsigned)Fixup.getKind()) {
160 default: llvm_unreachable("invalid fixup kind!");
162 case X86::reloc_global_offset_table:
163 Type = ELF::R_386_GOTPC;
170 llvm_unreachable("Unimplemented");
171 case MCSymbolRefExpr::VK_None:
172 Type = ELF::R_386_PC8;
181 llvm_unreachable("Unimplemented");
182 case MCSymbolRefExpr::VK_None:
183 Type = ELF::R_386_PC16;
188 case X86::reloc_signed_4byte:
193 llvm_unreachable("Unimplemented");
194 case MCSymbolRefExpr::VK_None:
195 Type = ELF::R_386_PC32;
197 case MCSymbolRefExpr::VK_PLT:
198 Type = ELF::R_386_PLT32;
204 switch ((unsigned)Fixup.getKind()) {
205 default: llvm_unreachable("invalid fixup kind!");
207 case X86::reloc_global_offset_table:
208 Type = ELF::R_386_GOTPC;
211 // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
213 case X86::reloc_signed_4byte:
218 llvm_unreachable("Unimplemented");
219 case MCSymbolRefExpr::VK_None:
220 Type = ELF::R_386_32;
222 case MCSymbolRefExpr::VK_GOT:
223 Type = ELF::R_386_GOT32;
225 case MCSymbolRefExpr::VK_GOTOFF:
226 Type = ELF::R_386_GOTOFF;
228 case MCSymbolRefExpr::VK_TLSGD:
229 Type = ELF::R_386_TLS_GD;
231 case MCSymbolRefExpr::VK_TPOFF:
232 Type = ELF::R_386_TLS_LE_32;
234 case MCSymbolRefExpr::VK_INDNTPOFF:
235 Type = ELF::R_386_TLS_IE;
237 case MCSymbolRefExpr::VK_NTPOFF:
238 Type = ELF::R_386_TLS_LE;
240 case MCSymbolRefExpr::VK_GOTNTPOFF:
241 Type = ELF::R_386_TLS_GOTIE;
243 case MCSymbolRefExpr::VK_TLSLDM:
244 Type = ELF::R_386_TLS_LDM;
246 case MCSymbolRefExpr::VK_DTPOFF:
247 Type = ELF::R_386_TLS_LDO_32;
249 case MCSymbolRefExpr::VK_GOTTPOFF:
250 Type = ELF::R_386_TLS_IE_32;
254 case FK_Data_2: Type = ELF::R_386_16; break;
256 case FK_Data_1: Type = ELF::R_386_8; break;
260 llvm_unreachable("Unsupported ELF machine type.");
265 MCObjectWriter *llvm::createX86ELFObjectWriter(raw_ostream &OS,
269 MCELFObjectTargetWriter *MOTW =
270 new X86ELFObjectWriter(IsELF64, OSABI, EMachine);
271 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);