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//===-- MBlazeELFWriterInfo.cpp - ELF Writer Info for the MBlaze 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 MBlaze backend.
//
//===----------------------------------------------------------------------===//
#include "MBlazeELFWriterInfo.h"
#include "MBlazeRelocations.h"
#include "llvm/Function.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/DataLayout.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Implementation of the MBlazeELFWriterInfo class
//===----------------------------------------------------------------------===//
MBlazeELFWriterInfo::MBlazeELFWriterInfo(TargetMachine &TM)
: TargetELFWriterInfo(TM.getDataLayout()->getPointerSizeInBits(0) == 64,
TM.getDataLayout()->isLittleEndian()) {
}
MBlazeELFWriterInfo::~MBlazeELFWriterInfo() {}
unsigned MBlazeELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
switch (MachineRelTy) {
case MBlaze::reloc_pcrel_word:
return ELF::R_MICROBLAZE_64_PCREL;
case MBlaze::reloc_absolute_word:
return ELF::R_MICROBLAZE_NONE;
default:
llvm_unreachable("unknown mblaze machine relocation type");
}
}
long int MBlazeELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
long int Modifier) const {
switch (RelTy) {
case ELF::R_MICROBLAZE_32_PCREL:
return Modifier - 4;
case ELF::R_MICROBLAZE_32:
return Modifier;
default:
llvm_unreachable("unknown mblaze relocation type");
}
}
unsigned MBlazeELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
// FIXME: Most of these sizes are guesses based on the name
switch (RelTy) {
case ELF::R_MICROBLAZE_32:
case ELF::R_MICROBLAZE_32_PCREL:
case ELF::R_MICROBLAZE_32_PCREL_LO:
case ELF::R_MICROBLAZE_32_LO:
case ELF::R_MICROBLAZE_SRO32:
case ELF::R_MICROBLAZE_SRW32:
case ELF::R_MICROBLAZE_32_SYM_OP_SYM:
case ELF::R_MICROBLAZE_GOTOFF_32:
return 32;
case ELF::R_MICROBLAZE_64_PCREL:
case ELF::R_MICROBLAZE_64:
case ELF::R_MICROBLAZE_GOTPC_64:
case ELF::R_MICROBLAZE_GOT_64:
case ELF::R_MICROBLAZE_PLT_64:
case ELF::R_MICROBLAZE_GOTOFF_64:
return 64;
}
return 0;
}
bool MBlazeELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
// FIXME: Most of these are guesses based on the name
switch (RelTy) {
case ELF::R_MICROBLAZE_32_PCREL:
case ELF::R_MICROBLAZE_64_PCREL:
case ELF::R_MICROBLAZE_32_PCREL_LO:
case ELF::R_MICROBLAZE_GOTPC_64:
return true;
}
return false;
}
unsigned MBlazeELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
return MBlaze::reloc_absolute_word;
}
long int MBlazeELFWriterInfo::computeRelocation(unsigned SymOffset,
unsigned RelOffset,
unsigned RelTy) const {
assert((RelTy == ELF::R_MICROBLAZE_32_PCREL ||
RelTy == ELF::R_MICROBLAZE_64_PCREL) &&
"computeRelocation unknown for this relocation type");
return SymOffset - (RelOffset + 4);
}
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