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224dbf4aec
I started trying to fix a small issue, but this code has seen a small fix too many. The old code was fairly convoluted. Some of the issues it had: * It failed to check if a symbol difference was in the some section when converting a relocation to pcrel. * It failed to check if the relocation was already pcrel. * The pcrel value computation was wrong in some cases (relocation-pc.s) * It was missing quiet a few cases where it should not convert symbol relocations to section relocations, leaving the backends to patch it up. * It would not propagate the fact that it had changed a relocation to pcrel, requiring a quiet nasty work around in ARM. * It was missing comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205076 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
//===-- AMDGPUAsmBackend.cpp - AMDGPU Assembler 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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/// \file
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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namespace {
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class AMDGPUMCObjectWriter : public MCObjectWriter {
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public:
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AMDGPUMCObjectWriter(raw_ostream &OS) : MCObjectWriter(OS, true) { }
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virtual void ExecutePostLayoutBinding(MCAssembler &Asm,
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const MCAsmLayout &Layout) {
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//XXX: Implement if necessary.
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}
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void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
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const MCFragment *Fragment, const MCFixup &Fixup,
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MCValue Target, bool &IsPCRel,
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uint64_t &FixedValue) override {
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assert(!"Not implemented");
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}
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virtual void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout);
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};
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class AMDGPUAsmBackend : public MCAsmBackend {
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public:
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AMDGPUAsmBackend(const Target &T)
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: MCAsmBackend() {}
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virtual unsigned getNumFixupKinds() const { return 0; };
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virtual void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
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uint64_t Value, bool IsPCRel) const;
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virtual bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
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const MCRelaxableFragment *DF,
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const MCAsmLayout &Layout) const {
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return false;
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}
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virtual void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
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assert(!"Not implemented");
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}
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virtual bool mayNeedRelaxation(const MCInst &Inst) const { return false; }
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virtual bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
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return true;
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}
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};
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} //End anonymous namespace
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void AMDGPUMCObjectWriter::WriteObject(MCAssembler &Asm,
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const MCAsmLayout &Layout) {
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for (MCAssembler::iterator I = Asm.begin(), E = Asm.end(); I != E; ++I) {
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Asm.writeSectionData(I, Layout);
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}
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}
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void AMDGPUAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
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unsigned DataSize, uint64_t Value,
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bool IsPCRel) const {
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uint16_t *Dst = (uint16_t*)(Data + Fixup.getOffset());
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assert(Fixup.getKind() == FK_PCRel_4);
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*Dst = (Value - 4) / 4;
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}
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//===----------------------------------------------------------------------===//
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// ELFAMDGPUAsmBackend class
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//===----------------------------------------------------------------------===//
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namespace {
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class ELFAMDGPUAsmBackend : public AMDGPUAsmBackend {
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public:
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ELFAMDGPUAsmBackend(const Target &T) : AMDGPUAsmBackend(T) { }
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MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
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return createAMDGPUELFObjectWriter(OS);
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}
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};
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} // end anonymous namespace
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MCAsmBackend *llvm::createAMDGPUAsmBackend(const Target &T,
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const MCRegisterInfo &MRI,
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StringRef TT,
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StringRef CPU) {
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return new ELFAMDGPUAsmBackend(T);
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}
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