forked from OSchip/llvm-project
154 lines
4.3 KiB
C++
154 lines
4.3 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 "MBlazeFixupKinds.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/ELFObjectWriter.h"
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#include "llvm/MC/MCAssembler.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/MachObjectWriter.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 MBlaze::reloc_pcrel_2byte:
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case FK_Data_2: return 2;
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case MBlaze::reloc_pcrel_4byte:
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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(T) {
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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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bool MBlazeAsmBackend::MayNeedRelaxation(const MCInst &Inst) const {
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return false;
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}
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void MBlazeAsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
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assert(0 && "MBlazeAsmBackend::RelaxInstruction() unimplemented");
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return;
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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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// FIXME: This should be in a separate file.
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// ELF is an ELF of course...
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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, MCDataFragment &DF,
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uint64_t Value) const;
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bool isVirtualSection(const MCSection &Section) const {
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const MCSectionELF &SE = static_cast<const MCSectionELF&>(Section);
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return SE.getType() == MCSectionELF::SHT_NOBITS;
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}
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MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
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return new ELFObjectWriter(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, MCDataFragment &DF,
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uint64_t Value) const {
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unsigned Size = getFixupKindSize(Fixup.getKind());
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assert(Fixup.getOffset() + Size <= DF.getContents().size() &&
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"Invalid fixup offset!");
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char *data = DF.getContents().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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