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//===-- MipsELFWriterInfo.cpp - ELF Writer Info for the Mips backend ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements ELF writer information for the Mips backend.
//
//===----------------------------------------------------------------------===//
#include "MipsELFWriterInfo.h"
#include "MipsRelocations.h"
#include "llvm/Function.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/ELF.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Implementation of the MipsELFWriterInfo class
//===----------------------------------------------------------------------===//
MipsELFWriterInfo::MipsELFWriterInfo(bool is64Bit_, bool isLittleEndian_)
: TargetELFWriterInfo(is64Bit_, isLittleEndian_) {
EMachine = EM_MIPS;
}
MipsELFWriterInfo::~MipsELFWriterInfo() {}
unsigned MipsELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
switch(MachineRelTy) {
case Mips::reloc_mips_pc16:
return ELF::R_MIPS_GOT16;
case Mips::reloc_mips_hi:
return ELF::R_MIPS_HI16;
case Mips::reloc_mips_lo:
return ELF::R_MIPS_LO16;
case Mips::reloc_mips_26:
return ELF::R_MIPS_26;
default:
llvm_unreachable("unknown Mips machine relocation type");
}
}
long int MipsELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
long int Modifier) const {
switch(RelTy) {
case ELF::R_MIPS_26: return Modifier;
default:
llvm_unreachable("unknown Mips relocation type");
}
}
unsigned MipsELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
switch(RelTy) {
case ELF::R_MIPS_GOT16:
case ELF::R_MIPS_26:
return 32;
default:
llvm_unreachable("unknown Mips relocation type");
}
}
bool MipsELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
switch(RelTy) {
case ELF::R_MIPS_GOT16:
return true;
case ELF::R_MIPS_26:
return false;
default:
llvm_unreachable("unknown Mips relocation type");
}
}
unsigned MipsELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
return Mips::reloc_mips_26;
}
long int MipsELFWriterInfo::computeRelocation(unsigned SymOffset,
unsigned RelOffset,
unsigned RelTy) const {
if (RelTy == ELF::R_MIPS_GOT16)
return SymOffset - (RelOffset + 4);
llvm_unreachable("computeRelocation unknown for this relocation type");
}
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