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freed data to be read. I will open a bug to track it being reenabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121028 91177308-0d34-0410-b5e6-96231b3b80d8
164 lines
4.5 KiB
C++
164 lines
4.5 KiB
C++
//===-- MBlazeAsmBackend.cpp - MBlaze 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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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetAsmBackend.h"
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#include "MBlaze.h"
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#include "MBlazeELFWriterInfo.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCELFSymbolFlags.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectFormat.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCValue.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/Support/raw_ostream.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Target/TargetAsmBackend.h"
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using namespace llvm;
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static unsigned getFixupKindSize(unsigned Kind) {
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switch (Kind) {
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default: assert(0 && "invalid fixup kind!");
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case FK_Data_1: return 1;
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case FK_PCRel_2:
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case FK_Data_2: return 2;
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case FK_PCRel_4:
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case FK_Data_4: return 4;
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case FK_Data_8: return 8;
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}
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}
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namespace {
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class MBlazeAsmBackend : public TargetAsmBackend {
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public:
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MBlazeAsmBackend(const Target &T)
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: TargetAsmBackend() {
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}
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bool MayNeedRelaxation(const MCInst &Inst) const;
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void RelaxInstruction(const MCInst &Inst, MCInst &Res) const;
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bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const;
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unsigned getPointerSize() const {
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return 4;
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}
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};
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static unsigned getRelaxedOpcode(unsigned Op) {
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switch (Op) {
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default: return Op;
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case MBlaze::ADDI: return MBlaze::ADDI32;
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case MBlaze::ORI: return MBlaze::ORI32;
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case MBlaze::BRLID: return MBlaze::BRLID32;
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}
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}
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bool MBlazeAsmBackend::MayNeedRelaxation(const MCInst &Inst) const {
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if (getRelaxedOpcode(Inst.getOpcode()) == Inst.getOpcode())
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return false;
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bool hasExprOrImm = false;
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for (unsigned i = 0; i < Inst.getNumOperands(); ++i)
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hasExprOrImm |= Inst.getOperand(i).isExpr();
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return hasExprOrImm;
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}
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void MBlazeAsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
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Res = Inst;
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Res.setOpcode(getRelaxedOpcode(Inst.getOpcode()));
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}
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bool MBlazeAsmBackend::WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
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if ((Count % 4) != 0)
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return false;
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for (uint64_t i = 0; i < Count; i += 4)
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OW->Write32(0x00000000);
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return true;
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}
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} // end anonymous namespace
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namespace {
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class ELFMBlazeAsmBackend : public MBlazeAsmBackend {
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MCELFObjectFormat Format;
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public:
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Triple::OSType OSType;
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ELFMBlazeAsmBackend(const Target &T, Triple::OSType _OSType)
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: MBlazeAsmBackend(T), OSType(_OSType) {
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HasScatteredSymbols = true;
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}
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virtual const MCObjectFormat &getObjectFormat() const {
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return Format;
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}
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void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
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uint64_t Value) const;
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MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
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return createELFObjectWriter(OS,/*Is64Bit=*/false,
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OSType, ELF::EM_MBLAZE,
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/*IsLittleEndian=*/false,
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/*HasRelocationAddend=*/true);
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}
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};
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void ELFMBlazeAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data,
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unsigned DataSize, uint64_t Value) const {
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unsigned Size = getFixupKindSize(Fixup.getKind());
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assert(Fixup.getOffset() + Size <= DataSize &&
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"Invalid fixup offset!");
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char *data = Data + Fixup.getOffset();
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switch (Size) {
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default: llvm_unreachable("Cannot fixup unknown value.");
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case 1: llvm_unreachable("Cannot fixup 1 byte value.");
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case 8: llvm_unreachable("Cannot fixup 8 byte value.");
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case 4:
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*(data+7) = uint8_t(Value);
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*(data+6) = uint8_t(Value >> 8);
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*(data+3) = uint8_t(Value >> 16);
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*(data+2) = uint8_t(Value >> 24);
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break;
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case 2:
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*(data+3) = uint8_t(Value >> 0);
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*(data+2) = uint8_t(Value >> 8);
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}
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}
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} // end anonymous namespace
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TargetAsmBackend *llvm::createMBlazeAsmBackend(const Target &T,
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const std::string &TT) {
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switch (Triple(TT).getOS()) {
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case Triple::Darwin:
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assert(0 && "Mac not supported on MBlaze");
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case Triple::MinGW32:
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case Triple::Cygwin:
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case Triple::Win32:
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assert(0 && "Windows not supported on MBlaze");
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default:
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return new ELFMBlazeAsmBackend(T, Triple(TT).getOS());
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}
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}
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