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