146 lines
5.5 KiB
C++
146 lines
5.5 KiB
C++
//===-- LoongArchDisassembler.cpp - Disassembler for LoongArch ------------===//
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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 LoongArchDisassembler class.
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/LoongArchBaseInfo.h"
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#include "MCTargetDesc/LoongArchMCTargetDesc.h"
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#include "TargetInfo/LoongArchTargetInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDecoderOps.h"
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#include "llvm/MC/MCDisassembler/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/TargetRegistry.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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#define DEBUG_TYPE "loongarch-disassembler"
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typedef MCDisassembler::DecodeStatus DecodeStatus;
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namespace {
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class LoongArchDisassembler : public MCDisassembler {
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public:
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LoongArchDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx)
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: MCDisassembler(STI, Ctx) {}
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DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
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ArrayRef<uint8_t> Bytes, uint64_t Address,
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raw_ostream &CStream) const override;
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};
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} // end namespace
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static MCDisassembler *createLoongArchDisassembler(const Target &T,
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const MCSubtargetInfo &STI,
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MCContext &Ctx) {
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return new LoongArchDisassembler(STI, Ctx);
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}
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLoongArchDisassembler() {
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// Register the disassembler for each target.
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TargetRegistry::RegisterMCDisassembler(getTheLoongArch32Target(),
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createLoongArchDisassembler);
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TargetRegistry::RegisterMCDisassembler(getTheLoongArch64Target(),
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createLoongArchDisassembler);
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}
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static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const MCDisassembler *Decoder) {
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if (RegNo >= 32)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::createReg(LoongArch::R0 + RegNo));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeFPR32RegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const MCDisassembler *Decoder) {
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if (RegNo >= 32)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::createReg(LoongArch::F0 + RegNo));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeFPR64RegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const MCDisassembler *Decoder) {
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if (RegNo >= 32)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::createReg(LoongArch::F0_64 + RegNo));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeCFRRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const MCDisassembler *Decoder) {
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if (RegNo >= 8)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::createReg(LoongArch::FCC0 + RegNo));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeFCSRRegisterClass(MCInst &Inst, uint64_t RegNo,
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uint64_t Address,
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const MCDisassembler *Decoder) {
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if (RegNo >= 4)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::createReg(LoongArch::FCSR0 + RegNo));
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return MCDisassembler::Success;
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}
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template <unsigned N, int P = 0>
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static DecodeStatus decodeUImmOperand(MCInst &Inst, uint64_t Imm,
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int64_t Address,
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const MCDisassembler *Decoder) {
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assert(isUInt<N>(Imm) && "Invalid immediate");
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Inst.addOperand(MCOperand::createImm(Imm + P));
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return MCDisassembler::Success;
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}
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template <unsigned N, unsigned S = 0>
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static DecodeStatus decodeSImmOperand(MCInst &Inst, uint64_t Imm,
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int64_t Address,
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const MCDisassembler *Decoder) {
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assert(isUInt<N>(Imm) && "Invalid immediate");
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// Sign-extend the number in the bottom <N> bits of Imm, then shift left <S>
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// bits.
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Inst.addOperand(MCOperand::createImm(SignExtend64<N>(Imm) << S));
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return MCDisassembler::Success;
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}
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#include "LoongArchGenDisassemblerTables.inc"
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DecodeStatus LoongArchDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
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ArrayRef<uint8_t> Bytes,
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uint64_t Address,
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raw_ostream &CS) const {
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uint32_t Insn;
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DecodeStatus Result;
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// We want to read exactly 4 bytes of data because all LoongArch instructions
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// are fixed 32 bits.
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if (Bytes.size() < 4) {
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Size = 0;
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return MCDisassembler::Fail;
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}
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Insn = support::endian::read32le(Bytes.data());
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// Calling the auto-generated decoder function.
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Result = decodeInstruction(DecoderTable32, MI, Insn, Address, this, STI);
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Size = 4;
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return Result;
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}
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