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 is64Bit, uint8_t OSABI);
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 Is64Bit, uint8_t OSABI)
34 : MCELFObjectTargetWriter(Is64Bit, OSABI,
35 Is64Bit ? ELF::EM_X86_64 : ELF::EM_386,
36 /*HasRelocationAddend*/ Is64Bit) {}
38 X86ELFObjectWriter::~X86ELFObjectWriter()
41 unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
44 bool IsRelocWithSymbol,
45 int64_t Addend) const {
46 // determine the type of the relocation
48 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
49 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
53 switch ((unsigned)Fixup.getKind()) {
54 default: llvm_unreachable("invalid fixup kind!");
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;
61 assert(Modifier == MCSymbolRefExpr::VK_None);
62 Type = ELF::R_X86_64_PC64;
64 case X86::reloc_signed_4byte:
65 case X86::reloc_riprel_4byte_movq_load:
66 case X86::reloc_riprel_4byte:
70 llvm_unreachable("Unimplemented");
71 case MCSymbolRefExpr::VK_None:
72 Type = ELF::R_X86_64_PC32;
74 case MCSymbolRefExpr::VK_PLT:
75 Type = ELF::R_X86_64_PLT32;
77 case MCSymbolRefExpr::VK_GOTPCREL:
78 Type = ELF::R_X86_64_GOTPCREL;
80 case MCSymbolRefExpr::VK_GOTTPOFF:
81 Type = ELF::R_X86_64_GOTTPOFF;
83 case MCSymbolRefExpr::VK_TLSGD:
84 Type = ELF::R_X86_64_TLSGD;
86 case MCSymbolRefExpr::VK_TLSLD:
87 Type = ELF::R_X86_64_TLSLD;
92 assert(Modifier == MCSymbolRefExpr::VK_None);
93 Type = ELF::R_X86_64_PC16;
96 assert(Modifier == MCSymbolRefExpr::VK_None);
97 Type = ELF::R_X86_64_PC8;
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:
107 llvm_unreachable("Unimplemented");
108 case MCSymbolRefExpr::VK_None:
109 Type = ELF::R_X86_64_32S;
111 case MCSymbolRefExpr::VK_GOT:
112 Type = ELF::R_X86_64_GOT32;
114 case MCSymbolRefExpr::VK_GOTPCREL:
115 Type = ELF::R_X86_64_GOTPCREL;
117 case MCSymbolRefExpr::VK_TPOFF:
118 Type = ELF::R_X86_64_TPOFF32;
120 case MCSymbolRefExpr::VK_DTPOFF:
121 Type = ELF::R_X86_64_DTPOFF32;
126 Type = ELF::R_X86_64_32;
128 case FK_Data_2: Type = ELF::R_X86_64_16; break;
130 case FK_Data_1: Type = ELF::R_X86_64_8; break;
135 switch ((unsigned)Fixup.getKind()) {
136 default: llvm_unreachable("invalid fixup kind!");
138 case X86::reloc_global_offset_table:
139 Type = ELF::R_386_GOTPC;
142 case X86::reloc_signed_4byte:
147 llvm_unreachable("Unimplemented");
148 case MCSymbolRefExpr::VK_None:
149 Type = ELF::R_386_PC32;
151 case MCSymbolRefExpr::VK_PLT:
152 Type = ELF::R_386_PLT32;
158 switch ((unsigned)Fixup.getKind()) {
159 default: llvm_unreachable("invalid fixup kind!");
161 case X86::reloc_global_offset_table:
162 Type = ELF::R_386_GOTPC;
165 // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
167 case X86::reloc_signed_4byte:
172 llvm_unreachable("Unimplemented");
173 case MCSymbolRefExpr::VK_None:
174 Type = ELF::R_386_32;
176 case MCSymbolRefExpr::VK_GOT:
177 Type = ELF::R_386_GOT32;
179 case MCSymbolRefExpr::VK_GOTOFF:
180 Type = ELF::R_386_GOTOFF;
182 case MCSymbolRefExpr::VK_TLSGD:
183 Type = ELF::R_386_TLS_GD;
185 case MCSymbolRefExpr::VK_TPOFF:
186 Type = ELF::R_386_TLS_LE_32;
188 case MCSymbolRefExpr::VK_INDNTPOFF:
189 Type = ELF::R_386_TLS_IE;
191 case MCSymbolRefExpr::VK_NTPOFF:
192 Type = ELF::R_386_TLS_LE;
194 case MCSymbolRefExpr::VK_GOTNTPOFF:
195 Type = ELF::R_386_TLS_GOTIE;
197 case MCSymbolRefExpr::VK_TLSLDM:
198 Type = ELF::R_386_TLS_LDM;
200 case MCSymbolRefExpr::VK_DTPOFF:
201 Type = ELF::R_386_TLS_LDO_32;
203 case MCSymbolRefExpr::VK_GOTTPOFF:
204 Type = ELF::R_386_TLS_IE_32;
208 case FK_Data_2: Type = ELF::R_386_16; break;
210 case FK_Data_1: Type = ELF::R_386_8; break;
218 MCObjectWriter *llvm::createX86ELFObjectWriter(raw_ostream &OS,
221 MCELFObjectTargetWriter *MOTW =
222 new X86ELFObjectWriter(Is64Bit, OSABI);
223 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);