ec17c4f075
Add basis of CSKY MCTargetDesc and it's enough to compile and link but doesn't yet do anything particularly useful. Once an ASM parser and printer are added in the next two patches, the whole thing can be usefully tested. Differential Revision: https://reviews.llvm.org/D93372
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===-- 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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