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https://github.com/c64scene-ar/llvm-6502.git
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6bb5212b6e
A couple of cases where we were accidentally creating constant conditions by something like "x == a || b" instead of "x == a || x == b". In one case a conditional & then unreachable was used - I transformed this into a direct assert instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154324 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
//===-- MBlazeELFWriterInfo.cpp - ELF Writer Info for the MBlaze backend --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements ELF writer information for the MBlaze backend.
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//
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//===----------------------------------------------------------------------===//
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#include "MBlazeELFWriterInfo.h"
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#include "MBlazeRelocations.h"
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#include "llvm/Function.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Implementation of the MBlazeELFWriterInfo class
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//===----------------------------------------------------------------------===//
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MBlazeELFWriterInfo::MBlazeELFWriterInfo(TargetMachine &TM)
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: TargetELFWriterInfo(TM.getTargetData()->getPointerSizeInBits() == 64,
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TM.getTargetData()->isLittleEndian()) {
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}
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MBlazeELFWriterInfo::~MBlazeELFWriterInfo() {}
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unsigned MBlazeELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
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switch (MachineRelTy) {
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case MBlaze::reloc_pcrel_word:
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return ELF::R_MICROBLAZE_64_PCREL;
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case MBlaze::reloc_absolute_word:
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return ELF::R_MICROBLAZE_NONE;
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default:
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llvm_unreachable("unknown mblaze machine relocation type");
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}
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}
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long int MBlazeELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
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long int Modifier) const {
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switch (RelTy) {
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case ELF::R_MICROBLAZE_32_PCREL:
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return Modifier - 4;
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case ELF::R_MICROBLAZE_32:
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return Modifier;
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default:
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llvm_unreachable("unknown mblaze relocation type");
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}
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}
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unsigned MBlazeELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
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// FIXME: Most of these sizes are guesses based on the name
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switch (RelTy) {
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case ELF::R_MICROBLAZE_32:
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case ELF::R_MICROBLAZE_32_PCREL:
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case ELF::R_MICROBLAZE_32_PCREL_LO:
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case ELF::R_MICROBLAZE_32_LO:
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case ELF::R_MICROBLAZE_SRO32:
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case ELF::R_MICROBLAZE_SRW32:
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case ELF::R_MICROBLAZE_32_SYM_OP_SYM:
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case ELF::R_MICROBLAZE_GOTOFF_32:
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return 32;
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case ELF::R_MICROBLAZE_64_PCREL:
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case ELF::R_MICROBLAZE_64:
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case ELF::R_MICROBLAZE_GOTPC_64:
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case ELF::R_MICROBLAZE_GOT_64:
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case ELF::R_MICROBLAZE_PLT_64:
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case ELF::R_MICROBLAZE_GOTOFF_64:
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return 64;
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}
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return 0;
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}
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bool MBlazeELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
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// FIXME: Most of these are guesses based on the name
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switch (RelTy) {
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case ELF::R_MICROBLAZE_32_PCREL:
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case ELF::R_MICROBLAZE_64_PCREL:
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case ELF::R_MICROBLAZE_32_PCREL_LO:
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case ELF::R_MICROBLAZE_GOTPC_64:
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return true;
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}
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return false;
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}
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unsigned MBlazeELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
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return MBlaze::reloc_absolute_word;
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}
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long int MBlazeELFWriterInfo::computeRelocation(unsigned SymOffset,
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unsigned RelOffset,
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unsigned RelTy) const {
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assert((RelTy == ELF::R_MICROBLAZE_32_PCREL ||
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RelTy == ELF::R_MICROBLAZE_64_PCREL) &&
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"computeRelocation unknown for this relocation type");
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return SymOffset - (RelOffset + 4);
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}
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