/src/capstonenext/arch/RISCV/RISCVDisassembler.c

Source
/* Capstone Disassembly Engine, http://www.capstone-engine.org */
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2022, */
/*    Rot127 <unisono@quyllur.org> 2022-2023 */
/* Automatically translated source file from LLVM. */

/* LLVM-commit: <commit> */
/* LLVM-tag: <tag> */

/* Only small edits allowed. */
/* For multiple similar edits, please create a Patch for the translator. */

/* Capstone's C++ file translator: */
/* https://github.com/capstone-engine/capstone/tree/next/suite/auto-sync */

//===-- RISCVDisassembler.cpp - Disassembler for RISC-V -------------------===//
//
// 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 RISCVDisassembler class.
//
//===----------------------------------------------------------------------===//

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <capstone/platform.h>

#include "../../MCInst.h"
#include "../../MathExtras.h"
#include "../../MCInstPrinter.h"
#include "../../MCDisassembler.h"
#include "../../MCFixedLenDisassembler.h"
#include "../../cs_priv.h"
#include "../../utils.h"
#include "RISCVDisassemblerExtension.h"
#include "RISCVBaseInfo.h"
#include "RISCVMapping.h"

#define GET_SUBTARGETINFO_ENUM
#include "RISCVGenSubtargetInfo.inc"

#define GET_REGINFO_ENUM
#include "RISCVGenRegisterInfo.inc"

#define GET_INSTRINFO_ENUM
#define GET_INSTRINFO_MC_DESC
#include "RISCVGenInstrInfo.inc"

#define CONCAT(a, b) CONCAT_(a, b)
#define CONCAT_(a, b) a##_##b

#define DEBUG_TYPE "riscv-disassembler"

DecodeStatus RISCV_getInstruction(MCInst *Instr, uint16_t *Size,
          const uint8_t *Bytes, size_t BytesLen,
          uint64_t Address, SStream *CStream);
void addSPOperands(MCInst *MI);
;
// end anonymous namespace

static DecodeStatus DecodeGPRRegisterClass(MCInst *Inst, uint32_t RegNo,
             uint64_t Address,
             const void *Decoder)
{
  bool IsRVE = RISCV_getFeatureBits(Inst->csh->mode, RISCV_FeatureRVE);

  if (RegNo >= 32 || (IsRVE && RegNo >= 16))
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_X0 + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeGPRX1X5RegisterClass(MCInst *Inst, uint32_t RegNo,
                 uint64_t Address,
                 const void *Decoder)
{
  MCRegister Reg = RISCV_X0 + RegNo;
  if (Reg != RISCV_X1 && Reg != RISCV_X5)
    return MCDisassembler_Fail;

  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeFPR16RegisterClass(MCInst *Inst, uint32_t RegNo,
               uint64_t Address,
               const void *Decoder)
{
  if (RegNo >= 32)
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_F0_H + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeFPR32RegisterClass(MCInst *Inst, uint32_t RegNo,
               uint64_t Address,
               const void *Decoder)
{
  if (RegNo >= 32)
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_F0_F + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeFPR32CRegisterClass(MCInst *Inst, uint32_t RegNo,
                uint64_t Address,
                const void *Decoder)
{
  if (RegNo >= 8) {
    return MCDisassembler_Fail;
  }
  MCRegister Reg = RISCV_F8_F + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeFPR64RegisterClass(MCInst *Inst, uint32_t RegNo,
               uint64_t Address,
               const void *Decoder)
{
  if (RegNo >= 32)
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_F0_D + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeFPR64CRegisterClass(MCInst *Inst, uint32_t RegNo,
                uint64_t Address,
                const void *Decoder)
{
  if (RegNo >= 8) {
    return MCDisassembler_Fail;
  }
  MCRegister Reg = RISCV_F8_D + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeGPRNoX0RegisterClass(MCInst *Inst, uint32_t RegNo,
                 uint64_t Address,
                 const void *Decoder)
{
  if (RegNo == 0) {
    return MCDisassembler_Fail;
  }

  return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder);
}

static DecodeStatus DecodeGPRNoX0X2RegisterClass(MCInst *Inst, uint64_t RegNo,
             uint32_t Address,
             const void *Decoder)
{
  if (RegNo == 2) {
    return MCDisassembler_Fail;
  }

  return DecodeGPRNoX0RegisterClass(Inst, RegNo, Address, Decoder);
}

static DecodeStatus DecodeGPRCRegisterClass(MCInst *Inst, uint32_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= 8)
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_X8 + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeGPRPairRegisterClass(MCInst *Inst, uint32_t RegNo,
                 uint64_t Address,
                 const void *Decoder)
{
  if (RegNo >= 32 || RegNo & 1)
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_X0 + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeSR07RegisterClass(MCInst *Inst, uint64_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= 8)
    return MCDisassembler_Fail;

  MCRegister Reg = (RegNo < 2) ? (RegNo + RISCV_X8) :
               (RegNo - 2 + RISCV_X18);
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeVRRegisterClass(MCInst *Inst, uint32_t RegNo,
            uint64_t Address, const void *Decoder)
{
  if (RegNo >= 32)
    return MCDisassembler_Fail;

  MCRegister Reg = RISCV_V0 + RegNo;
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeVRM2RegisterClass(MCInst *Inst, uint32_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= 32 || RegNo % 2)
    return MCDisassembler_Fail;

  MCRegister Reg = MCRegisterInfo_getMatchingSuperReg(
    Inst->MRI, RISCV_V0 + RegNo, RISCV_sub_vrm1_0,
    MCRegisterInfo_getRegClass(Inst->MRI, RISCV_VRM2RegClassID));

  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeVRM4RegisterClass(MCInst *Inst, uint32_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= 32 || RegNo % 4)
    return MCDisassembler_Fail;

  MCRegister Reg = MCRegisterInfo_getMatchingSuperReg(
    Inst->MRI, RISCV_V0 + RegNo, RISCV_sub_vrm1_0,
    MCRegisterInfo_getRegClass(Inst->MRI, RISCV_VRM4RegClassID));

  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeVRM8RegisterClass(MCInst *Inst, uint32_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= 32 || RegNo % 8)
    return MCDisassembler_Fail;

  MCRegister Reg = MCRegisterInfo_getMatchingSuperReg(
    Inst->MRI, RISCV_V0 + RegNo, RISCV_sub_vrm1_0,
    MCRegisterInfo_getRegClass(Inst->MRI, RISCV_VRM8RegClassID));

  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus decodeVMaskReg(MCInst *Inst, uint64_t RegNo,
           uint64_t Address, const void *Decoder)
{
  if (RegNo > 2) {
    return MCDisassembler_Fail;
  }
  MCRegister Reg = (RegNo == 0) ? RISCV_V0 : RISCV_NoRegister;

  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

#define DEFINE_decodeUImmOperand(N) \
  static DecodeStatus CONCAT(decodeUImmOperand, \
           N)(MCInst * Inst, uint32_t Imm, \
              int64_t Address, const void *Decoder) \
  { \
    CS_ASSERT(isUIntN(N, Imm) && "Invalid immediate"); \
    MCOperand_CreateImm0(Inst, (Imm)); \
    return MCDisassembler_Success; \
  }
DEFINE_decodeUImmOperand(6);
DEFINE_decodeUImmOperand(2);
DEFINE_decodeUImmOperand(8);
DEFINE_decodeUImmOperand(9);
DEFINE_decodeUImmOperand(7);
DEFINE_decodeUImmOperand(4);
DEFINE_decodeUImmOperand(20);
DEFINE_decodeUImmOperand(5);
DEFINE_decodeUImmOperand(11);
DEFINE_decodeUImmOperand(10);
DEFINE_decodeUImmOperand(12);
DEFINE_decodeUImmOperand(3);
DEFINE_decodeUImmOperand(1);

#define DEFINE_decodeUImmNonZeroOperand(N) \
  static DecodeStatus CONCAT(decodeUImmNonZeroOperand, \
           N)(MCInst * Inst, uint32_t Imm, \
              int64_t Address, const void *Decoder) \
  { \
    if (Imm == 0) \
      return MCDisassembler_Fail; \
    return CONCAT(decodeUImmOperand, N)(Inst, Imm, Address, \
                Decoder); \
  }
DEFINE_decodeUImmNonZeroOperand(10);

#define DEFINE_decodeSImmOperand(N) \
  static DecodeStatus CONCAT(decodeSImmOperand, \
           N)(MCInst * Inst, uint32_t Imm, \
              int64_t Address, const void *Decoder) \
  { \
    CS_ASSERT(isUIntN(N, Imm) && "Invalid immediate"); \
\
    MCOperand_CreateImm0(Inst, (SignExtend64((Imm), N))); \
    return MCDisassembler_Success; \
  }
DEFINE_decodeSImmOperand(6);
DEFINE_decodeSImmOperand(12);
DEFINE_decodeSImmOperand(5);
DEFINE_decodeSImmOperand(10);

#define DEFINE_decodeSImmNonZeroOperand(N) \
  static DecodeStatus CONCAT(decodeSImmNonZeroOperand, \
           N)(MCInst * Inst, uint32_t Imm, \
              int64_t Address, const void *Decoder) \
  { \
    if (Imm == 0) \
      return MCDisassembler_Fail; \
    return CONCAT(decodeSImmOperand, N)(Inst, Imm, Address, \
                Decoder); \
  }
DEFINE_decodeSImmNonZeroOperand(6);
DEFINE_decodeSImmNonZeroOperand(10);

#define DEFINE_decodeSImmOperandAndLsl1(N) \
  static DecodeStatus CONCAT(decodeSImmOperandAndLsl1, \
           N)(MCInst * Inst, uint32_t Imm, \
              int64_t Address, const void *Decoder) \
  { \
    CS_ASSERT(isUIntN(N, Imm) && "Invalid immediate"); \
\
    MCOperand_CreateImm0(Inst, (SignExtend64((Imm << 1), N))); \
    return MCDisassembler_Success; \
  }
DEFINE_decodeSImmOperandAndLsl1(12);
DEFINE_decodeSImmOperandAndLsl1(9);
DEFINE_decodeSImmOperandAndLsl1(13);
DEFINE_decodeSImmOperandAndLsl1(21);

static DecodeStatus decodeCLUIImmOperand(MCInst *Inst, uint32_t Imm,
           int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(6, Imm) && "Invalid immediate");
  if (Imm > 31) {
    Imm = (SignExtend64((Imm), 6) & 0xfffff);
  }
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeFRMArg(MCInst *Inst, uint32_t Imm, int64_t Address,
         const void *Decoder)
{
  CS_ASSERT(isUIntN(3, Imm) && "Invalid immediate");
  if (!RISCVFPRndMode_isValidRoundingMode(Imm))
    return MCDisassembler_Fail;

  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeRVCInstrRdRs1ImmZero(MCInst *Inst, uint32_t Insn,
                 uint64_t Address,
                 const void *Decoder);

static DecodeStatus decodeRVCInstrRdSImm(MCInst *Inst, uint32_t Insn,
           uint64_t Address, const void *Decoder);

static DecodeStatus decodeRVCInstrRdRs1UImm(MCInst *Inst, uint32_t Insn,
              uint64_t Address,
              const void *Decoder);

static DecodeStatus decodeRVCInstrRdRs2(MCInst *Inst, uint32_t Insn,
          uint64_t Address, const void *Decoder);

static DecodeStatus decodeRVCInstrRdRs1Rs2(MCInst *Inst, uint32_t Insn,
             uint64_t Address,
             const void *Decoder);

static DecodeStatus decodeXTHeadMemPair(MCInst *Inst, uint32_t Insn,
          uint64_t Address, const void *Decoder);

static DecodeStatus decodeZcmpRlist(MCInst *Inst, unsigned Imm,
            uint64_t Address, const void *Decoder);

static DecodeStatus decodeRegReg(MCInst *Inst, uint32_t Insn, uint64_t Address,
         const void *Decoder);

static DecodeStatus decodeZcmpSpimm(MCInst *Inst, unsigned Imm,
            uint64_t Address, const void *Decoder);

static DecodeStatus decodeCSSPushPopchk(MCInst *Inst, uint32_t Insn,
          uint64_t Address, const void *Decoder);

static DecodeStatus decodeUImmLog2XLenOperand(MCInst *Inst, uint32_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isUIntN(6, Imm) && "Invalid immediate");

  if (!RISCV_getFeatureBits(Inst->csh->mode, RISCV_Feature64Bit) &&
      !isUIntN(5, Imm))
    return MCDisassembler_Fail;

  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeUImmLog2XLenNonZeroOperand(MCInst *Inst, uint32_t Imm,
                 int64_t Address,
                 const void *Decoder)
{
  if (Imm == 0)
    return MCDisassembler_Fail;
  return decodeUImmLog2XLenOperand(Inst, Imm, Address, Decoder);
}

#include "RISCVGenDisassemblerTables.inc"

static DecodeStatus decodeRVCInstrRdRs1ImmZero(MCInst *Inst, uint32_t Insn,
                 uint64_t Address,
                 const void *Decoder)
{
  uint32_t Rd = fieldFromInstruction_4(Insn, 7, 5);
  if (DecodeGPRNoX0RegisterClass(Inst, Rd, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  MCInst_addOperand2(Inst, (MCInst_getOperand(Inst, (0))));
  MCOperand_CreateImm0(Inst, (0));
  return MCDisassembler_Success;
}

static DecodeStatus decodeCSSPushPopchk(MCInst *Inst, uint32_t Insn,
          uint64_t Address, const void *Decoder)
{
  uint32_t Rs1 = fieldFromInstruction_4(Insn, 7, 5);
  if (DecodeGPRX1X5RegisterClass(Inst, Rs1, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  return MCDisassembler_Success;
}

static DecodeStatus decodeRVCInstrRdSImm(MCInst *Inst, uint32_t Insn,
           uint64_t Address, const void *Decoder)
{
  MCOperand_CreateReg0(Inst, (RISCV_X0));
  uint32_t SImm6 = fieldFromInstruction_4(Insn, 12, 1) << 5 |
       fieldFromInstruction_4(Insn, 2, 5);
  DecodeStatus Result =
    CONCAT(decodeSImmOperand, 6)(Inst, SImm6, Address, Decoder);
  (void)Result;
  CS_ASSERT(Result == MCDisassembler_Success && "Invalid immediate");
  return MCDisassembler_Success;
}

static DecodeStatus decodeRVCInstrRdRs1UImm(MCInst *Inst, uint32_t Insn,
              uint64_t Address,
              const void *Decoder)
{
  MCOperand_CreateReg0(Inst, (RISCV_X0));
  MCInst_addOperand2(Inst, (MCInst_getOperand(Inst, (0))));
  uint32_t UImm6 = fieldFromInstruction_4(Insn, 12, 1) << 5 |
       fieldFromInstruction_4(Insn, 2, 5);
  DecodeStatus Result =
    CONCAT(decodeUImmOperand, 6)(Inst, UImm6, Address, Decoder);
  (void)Result;
  CS_ASSERT(Result == MCDisassembler_Success && "Invalid immediate");
  return MCDisassembler_Success;
}

static DecodeStatus decodeRVCInstrRdRs2(MCInst *Inst, uint32_t Insn,
          uint64_t Address, const void *Decoder)
{
  uint32_t Rd = fieldFromInstruction_4(Insn, 7, 5);
  uint32_t Rs2 = fieldFromInstruction_4(Insn, 2, 5);
  if (DecodeGPRRegisterClass(Inst, Rd, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  if (DecodeGPRRegisterClass(Inst, Rs2, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  return MCDisassembler_Success;
}

static DecodeStatus decodeRVCInstrRdRs1Rs2(MCInst *Inst, uint32_t Insn,
             uint64_t Address,
             const void *Decoder)
{
  uint32_t Rd = fieldFromInstruction_4(Insn, 7, 5);
  uint32_t Rs2 = fieldFromInstruction_4(Insn, 2, 5);
  if (DecodeGPRRegisterClass(Inst, Rd, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  MCInst_addOperand2(Inst, (MCInst_getOperand(Inst, (0))));
  if (DecodeGPRRegisterClass(Inst, Rs2, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  return MCDisassembler_Success;
}

static DecodeStatus decodeXTHeadMemPair(MCInst *Inst, uint32_t Insn,
          uint64_t Address, const void *Decoder)
{
  uint32_t Rd1 = fieldFromInstruction_4(Insn, 7, 5);
  uint32_t Rs1 = fieldFromInstruction_4(Insn, 15, 5);
  uint32_t Rd2 = fieldFromInstruction_4(Insn, 20, 5);
  uint32_t UImm2 = fieldFromInstruction_4(Insn, 25, 2);
  if (DecodeGPRRegisterClass(Inst, Rd1, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  if (DecodeGPRRegisterClass(Inst, Rd2, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  if (DecodeGPRRegisterClass(Inst, Rs1, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  DecodeStatus Result =
    CONCAT(decodeUImmOperand, 2)(Inst, UImm2, Address, Decoder);
  (void)Result;
  CS_ASSERT(Result == MCDisassembler_Success && "Invalid immediate");

  // Disassemble the final operand which is implicit.
  unsigned Opcode = MCInst_getOpcode(Inst);
  bool IsWordOp = (Opcode == RISCV_TH_LWD || Opcode == RISCV_TH_LWUD ||
       Opcode == RISCV_TH_SWD);
  if (IsWordOp)
    MCOperand_CreateImm0(Inst, (3));
  else
    MCOperand_CreateImm0(Inst, (4));

  return MCDisassembler_Success;
}

static DecodeStatus decodeZcmpRlist(MCInst *Inst, unsigned Imm,
            uint64_t Address, const void *Decoder)
{
  if (Imm <= 3)
    return MCDisassembler_Fail;
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeRegReg(MCInst *Inst, uint32_t Insn, uint64_t Address,
         const void *Decoder)
{
  uint32_t Rs1 = fieldFromInstruction_4(Insn, 0, 5);
  uint32_t Rs2 = fieldFromInstruction_4(Insn, 5, 5);
  if (DecodeGPRRegisterClass(Inst, Rs1, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  if (DecodeGPRRegisterClass(Inst, Rs2, Address, Decoder) ==
      MCDisassembler_Fail)
    return MCDisassembler_Fail;
  return MCDisassembler_Success;
}

static DecodeStatus decodeZcmpSpimm(MCInst *Inst, unsigned Imm,
            uint64_t Address, const void *Decoder)
{
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

// Add implied SP operand for C.*SP compressed instructions. The SP operand
// isn't explicitly encoded in the instruction.
void addSPOperands(MCInst *MI)
{
  const MCInstrDesc *MCID = MCInstrDesc_get(MCInst_getOpcode(MI),
              RISCVDescs.Insts,
              ARR_SIZE(RISCVDescs.Insts));
  MCOperand SPReg;
  SPReg.MachineOperandType = kRegister;
  SPReg.Kind = kRegister;
  SPReg.RegVal = RISCV_X2;
  for (unsigned i = 0; i < MCID->NumOperands; i++)
    if (MCID->OpInfo[i].RegClass == RISCV_SPRegClassID)
      MCInst_insert0(MI, i, &SPReg);
}

DecodeStatus RISCV_getInstruction(MCInst *MI, uint16_t *Size,
          const uint8_t *Bytes, size_t BytesLen,
          uint64_t Address, SStream *CS)
{
  // TODO: This will need modification when supporting instruction set
  // extensions with instructions > 32-bits (up to 176 bits wide).
  uint32_t Insn;
  DecodeStatus Result;

#define TRY_TO_DECODE_WITH_ADDITIONAL_OPERATION( \
  width, FEATURE_CHECKS, DECODER_TABLE, DESC, ADDITIONAL_OPERATION) \
  do { \
    if (FEATURE_CHECKS) { \
      Result = decodeInstruction_##width( \
        DECODER_TABLE, MI, Insn, Address, NULL); \
      if (Result != MCDisassembler_Fail) { \
        ADDITIONAL_OPERATION; \
        return Result; \
      } \
    } \
  } while (false)
#define TRY_TO_DECODE_AND_ADD_SP(width, FEATURE_CHECKS, DECODER_TABLE, DESC) \
  TRY_TO_DECODE_WITH_ADDITIONAL_OPERATION( \
    width, FEATURE_CHECKS, DECODER_TABLE, DESC, addSPOperands(MI))
#define TRY_TO_DECODE(width, FEATURE_CHECKS, DECODER_TABLE, DESC) \
  TRY_TO_DECODE_WITH_ADDITIONAL_OPERATION( \
    width, FEATURE_CHECKS, DECODER_TABLE, DESC, (void)NULL)
#define TRY_TO_DECODE_FEATURE(width, FEATURE, DECODER_TABLE, DESC) \
  TRY_TO_DECODE(width, RISCV_getFeatureBits(MI->csh->mode, FEATURE), \
          DECODER_TABLE, DESC)

  // It's a 32 bit instruction if bit 0 and 1 are 1.
  if ((Bytes[0] & 0x3) == 0x3) {
    if (BytesLen < 4) {
      *Size = 0;
      return MCDisassembler_Fail;
    }
    *Size = 4;

    Insn = readBytes32(MI, Bytes);

    TRY_TO_DECODE(4,
            RISCV_getFeatureBits(MI->csh->mode,
               RISCV_FeatureStdExtZdinx) &&
              !RISCV_getFeatureBits(MI->csh->mode,
                  RISCV_Feature64Bit),
            DecoderTableRV32Zdinx32,
            "RV32Zdinx table (Double in Integer and rv32)");
    TRY_TO_DECODE(4,
            RISCV_getFeatureBits(MI->csh->mode,
               RISCV_FeatureStdExtZacas) &&
              !RISCV_getFeatureBits(MI->csh->mode,
                  RISCV_Feature64Bit),
            DecoderTableRV32Zacas32,
            "RV32Zacas table (Compare-And-Swap and rv32)");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureStdExtZfinx,
              DecoderTableRVZfinx32,
              "RVZfinx table (Float in Integer)");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXVentanaCondOps,
              DecoderTableXVentana32,
              "Ventana custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadBa,
              DecoderTableXTHeadBa32,
              "XTHeadBa custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadBb,
              DecoderTableXTHeadBb32,
              "XTHeadBb custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadBs,
              DecoderTableXTHeadBs32,
              "XTHeadBs custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadCondMov,
              DecoderTableXTHeadCondMov32,
              "XTHeadCondMov custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadCmo,
              DecoderTableXTHeadCmo32,
              "XTHeadCmo custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadFMemIdx,
              DecoderTableXTHeadFMemIdx32,
              "XTHeadFMemIdx custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadMac,
              DecoderTableXTHeadMac32,
              "XTHeadMac custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadMemIdx,
              DecoderTableXTHeadMemIdx32,
              "XTHeadMemIdx custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadMemPair,
              DecoderTableXTHeadMemPair32,
              "XTHeadMemPair custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadSync,
              DecoderTableXTHeadSync32,
              "XTHeadSync custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXTHeadVdot,
              DecoderTableXTHeadVdot32,
              "XTHeadVdot custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXSfvcp,
              DecoderTableXSfvcp32,
              "SiFive VCIX custom opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXSfvqmaccdod,
      DecoderTableXSfvqmaccdod32,
      "SiFive Matrix Multiplication (2x8 and 8x2) Instruction opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXSfvqmaccqoq,
      DecoderTableXSfvqmaccqoq32,
      "SiFive Matrix Multiplication (4x8 and 8x4) Instruction opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXSfvfwmaccqqq,
      DecoderTableXSfvfwmaccqqq32,
      "SiFive Matrix Multiplication Instruction opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXSfvfnrclipxfqf,
      DecoderTableXSfvfnrclipxfqf32,
      "SiFive FP32-to-int8 Ranged Clip Instructions opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXCVbitmanip,
      DecoderTableXCVbitmanip32,
      "CORE-V Bit Manipulation custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXCVelw,
              DecoderTableXCVelw32,
              "CORE-V Event load custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXCVmac,
              DecoderTableXCVmac32,
              "CORE-V MAC custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXCVmem,
              DecoderTableXCVmem32,
              "CORE-V MEM custom opcode table");
    TRY_TO_DECODE_FEATURE(4, RISCV_FeatureVendorXCValu,
              DecoderTableXCValu32,
              "CORE-V ALU custom opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXCVsimd, DecoderTableXCVsimd32,
      "CORE-V SIMD extensions custom opcode table");
    TRY_TO_DECODE_FEATURE(
      4, RISCV_FeatureVendorXCVbi, DecoderTableXCVbi32,
      "CORE-V Immediate Branching custom opcode table");
    TRY_TO_DECODE(4, true, DecoderTable32, "RISCV32 table");

    return MCDisassembler_Fail;
  }

  if (BytesLen < 2) {
    *Size = 0;
    return MCDisassembler_Fail;
  }
  *Size = 2;

  Insn = readBytes16(MI, Bytes);
  TRY_TO_DECODE_AND_ADD_SP(
    2, !RISCV_getFeatureBits(MI->csh->mode, RISCV_Feature64Bit),
    DecoderTableRISCV32Only_16,
    "RISCV32Only_16 table (16-bit Instruction)");
  TRY_TO_DECODE_FEATURE(2, RISCV_FeatureStdExtZicfiss,
            DecoderTableZicfiss16,
            "RVZicfiss table (Shadow Stack)");
  TRY_TO_DECODE_FEATURE(2, RISCV_FeatureStdExtZcmt, DecoderTableRVZcmt16,
            "Zcmt table (16-bit Table Jump Instructions)");
  TRY_TO_DECODE_FEATURE(
    2, RISCV_FeatureStdExtZcmp, DecoderTableRVZcmp16,
    "Zcmp table (16-bit Push/Pop & Double Move Instructions)");
  TRY_TO_DECODE_AND_ADD_SP(2, true, DecoderTable16,
         "RISCV_C table (16-bit Instruction)");

  return MCDisassembler_Fail;
}

bool RISCV_LLVM_getInstruction(csh handle, const uint8_t *Bytes, size_t ByteLen,
             MCInst *MI, uint16_t *Size, uint64_t Address,
             void *Info)
{
  RISCV_init_cs_detail(MI);
  MI->MRI = (MCRegisterInfo *)Info;
  DecodeStatus ret =
    RISCV_getInstruction(MI, Size, Bytes, ByteLen, Address, NULL);

  MCInst_handleWriteback(MI, RISCVDescs.Insts,
             ARR_SIZE(RISCVDescs.Insts));

  return ret != MCDisassembler_Fail;
}

Coverage Report

Created: 2026-10-17 07:17