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