69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
//===-- LoongArchAsmBackend.cpp - LoongArch Assembler Backend -*- C++ -*---===//
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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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//
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// This file implements the LoongArchAsmBackend class.
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//
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//===----------------------------------------------------------------------===//
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#include "LoongArchAsmBackend.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/MCELFObjectWriter.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/EndianStream.h"
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#define DEBUG_TYPE "loongarch-asmbackend"
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using namespace llvm;
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void LoongArchAsmBackend::applyFixup(const MCAssembler &Asm,
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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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// TODO: Apply the Value for given Fixup into the provided data fragment.
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return;
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}
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bool LoongArchAsmBackend::shouldForceRelocation(const MCAssembler &Asm,
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const MCFixup &Fixup,
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const MCValue &Target) {
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// TODO: Determine which relocation require special processing at linking
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// time.
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return false;
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}
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bool LoongArchAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count,
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const MCSubtargetInfo *STI) const {
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// Check for byte count not multiple of instruction word size
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if (Count % 4 != 0)
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return false;
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// The nop on LoongArch is andi r0, r0, 0.
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for (; Count >= 4; Count -= 4)
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support::endian::write<uint32_t>(OS, 0x03400000, support::little);
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return true;
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}
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std::unique_ptr<MCObjectTargetWriter>
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LoongArchAsmBackend::createObjectTargetWriter() const {
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return createLoongArchELFObjectWriter(OSABI, Is64Bit);
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}
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MCAsmBackend *llvm::createLoongArchAsmBackend(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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const Triple &TT = STI.getTargetTriple();
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uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
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return new LoongArchAsmBackend(STI, OSABI, TT.isArch64Bit());
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}
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