1 //===-- X86ELFWriterInfo.cpp - ELF Writer Info for the X86 backend --------===//
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 // This file implements ELF writer information for the X86 backend.
12 //===----------------------------------------------------------------------===//
14 #include "X86ELFWriterInfo.h"
15 #include "X86Relocations.h"
16 #include "llvm/Function.h"
17 #include "llvm/Support/ErrorHandling.h"
18 #include "llvm/Target/TargetData.h"
19 #include "llvm/Target/TargetMachine.h"
23 //===----------------------------------------------------------------------===//
24 // Implementation of the X86ELFWriterInfo class
25 //===----------------------------------------------------------------------===//
27 X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)
28 : TargetELFWriterInfo(TM) {
29 bool is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
30 EMachine = is64Bit ? EM_X86_64 : EM_386;
33 X86ELFWriterInfo::~X86ELFWriterInfo() {}
35 unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
37 switch(MachineRelTy) {
38 case X86::reloc_pcrel_word:
40 case X86::reloc_absolute_word:
42 case X86::reloc_absolute_word_sext:
44 case X86::reloc_absolute_dword:
46 case X86::reloc_picrel_word:
48 llvm_unreachable("unknown x86_64 machine relocation type");
51 switch(MachineRelTy) {
52 case X86::reloc_pcrel_word:
54 case X86::reloc_absolute_word:
56 case X86::reloc_absolute_word_sext:
57 case X86::reloc_absolute_dword:
58 case X86::reloc_picrel_word:
60 llvm_unreachable("unknown x86 machine relocation type");
66 long int X86ELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
67 long int Modifier) const {
70 case R_X86_64_PC32: return Modifier - 4;
76 llvm_unreachable("unknown x86_64 relocation type");
80 case R_386_PC32: return Modifier - 4;
81 case R_386_32: return Modifier;
83 llvm_unreachable("unknown x86 relocation type");
89 unsigned X86ELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
99 llvm_unreachable("unknown x86_64 relocation type");
107 llvm_unreachable("unknown x86 relocation type");
113 bool X86ELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
123 llvm_unreachable("unknown x86_64 relocation type");
132 llvm_unreachable("unknown x86 relocation type");
138 unsigned X86ELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
140 X86::reloc_absolute_dword : X86::reloc_absolute_word;
143 long int X86ELFWriterInfo::computeRelocation(unsigned SymOffset,
145 unsigned RelTy) const {
147 if (RelTy == R_X86_64_PC32 || RelTy == R_386_PC32)
148 return SymOffset - (RelOffset + 4);
150 assert("computeRelocation unknown for this relocation type");