70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
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//===-- CSKYAsmBackend.cpp - CSKY Assembler Backend -----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "CSKYAsmBackend.h"
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#include "MCTargetDesc/CSKYMCTargetDesc.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCFixupKindInfo.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/Support/Debug.h"
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#define DEBUG_TYPE "csky-asmbackend"
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using namespace llvm;
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std::unique_ptr<MCObjectTargetWriter>
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CSKYAsmBackend::createObjectTargetWriter() const {
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return createCSKYELFObjectWriter();
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}
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unsigned int CSKYAsmBackend::getNumFixupKinds() const { return 1; }
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void CSKYAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
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const MCValue &Target,
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MutableArrayRef<char> Data, uint64_t Value,
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bool IsResolved,
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const MCSubtargetInfo *STI) const {
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return;
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}
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bool CSKYAsmBackend::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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void CSKYAsmBackend::relaxInstruction(MCInst &Inst,
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const MCSubtargetInfo &STI) const {
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llvm_unreachable("CSKYAsmBackend::relaxInstruction() unimplemented");
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}
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bool CSKYAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count) const {
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if (Count % 2)
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return false;
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// MOV32 r0, r0
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while (Count >= 4) {
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OS.write("\xc4\x00\x48\x20", 4);
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Count -= 4;
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}
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// MOV16 r0, r0
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if (Count)
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OS.write("\x6c\x03", 2);
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return true;
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}
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MCAsmBackend *llvm::createCSKYAsmBackend(const Target &T,
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const MCSubtargetInfo &STI,
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const MCRegisterInfo &MRI,
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const MCTargetOptions &Options) {
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return new CSKYAsmBackend(STI, Options);
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}
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