/src/capstonev5/arch/AArch64/AArch64Disassembler.c

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//===- AArch64Disassembler.cpp - Disassembler for AArch64 ISA -------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the functions necessary to decode AArch64 instruction
// bitpatterns into MCInsts (with the help of TableGenerated information from
// the instruction definitions).
//
//===----------------------------------------------------------------------===//

/* Capstone Disassembly Engine */
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2019 */

#ifdef CAPSTONE_HAS_ARM64

#include <stdio.h>  // DEBUG
#include <stdlib.h>

#include "../../cs_priv.h"
#include "../../utils.h"

#include "AArch64Disassembler.h"

#include "../../MCDisassembler.h"
#include "../../MCFixedLenDisassembler.h"
#include "../../MCInst.h"
#include "../../MCInstrDesc.h"
#include "../../MCRegisterInfo.h"

#include "AArch64AddressingModes.h"
#include "AArch64BaseInfo.h"

// Forward declare these because the autogenerated code will reference them.
// Definitions are further down.
static DecodeStatus DecodeFPR128RegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFPR64RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFPR32RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFPR16RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFPR8RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeGPR64RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeGPR64x8ClassRegisterClass(MCInst *Inst, unsigned RegNo, 
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeGPR64spRegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMatrixIndexGPR32_12_15RegisterClass(MCInst *Inst,
        unsigned RegNo, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeGPR32RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeGPR32spRegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeQQRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeQQQRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeQQQQRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeDDRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeDDDRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeDDDDRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeZPRRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeZPR_4bRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeZPR_3bRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeZPR2RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeZPR3RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeZPR4RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMatrixTile(MCInst *Inst, unsigned RegNo, 
    uint64_t Address, const void *Decoder, unsigned NumBitsForTile);
static DecodeStatus DecodeMatrixTileListRegisterClass(MCInst *Inst,
        unsigned RegMask, uint64_t Address, const void *Decoder);
static DecodeStatus DecodePPRRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodePPR_3bRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFixedPointScaleImm32(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFixedPointScaleImm64(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodePCRelLabel19(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMemExtend(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMRSSystemRegister(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMSRSystemRegister(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMoveImmInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeUnsignedLdStInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeSignedLdStInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeExclusiveLdStInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodePairLdStInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeAuthLoadInstruction(MCInst *Inst, uint32_t insn, 
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeAddSubERegInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeLogicalImmInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeModImmInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeModImmTiedInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeAdrInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeAddSubImmShift(MCInst *Inst, uint32_t insn,
        uint64_t Address, const void *Decoder);
static DecodeStatus DecodeUnconditionalBranch(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeSystemPStateInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Address, const void *Decoder);
static DecodeStatus DecodeTestAndBranch(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeFMOVLaneInstruction(MCInst *Inst, unsigned Insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeVecShiftR64Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftR64ImmNarrow(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftR32Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftR32ImmNarrow(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftR16Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftR16ImmNarrow(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftR8Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftL64Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftL32Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftL16Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeVecShiftL8Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeWSeqPairsClassRegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeXSeqPairsClassRegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeSVELogicalImmInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Address, const void *Decoder);
static DecodeStatus DecodeSImm(MCInst *Inst, uint64_t Imm, uint64_t Address,
    const void *Decoder, int Bits);
static DecodeStatus DecodeImm8OptLsl(MCInst *Inst, unsigned Imm, uint64_t Addr,
    const void *Decoder, int ElementWidth);
static DecodeStatus DecodeSVEIncDecImm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeThreeAddrSRegInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeGPR64commonRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeFPR128_loRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeSVCROp(MCInst *Inst, unsigned Imm, uint64_t Address, 
    const void *Decoder);
static DecodeStatus DecodeCPYMemOpInstruction(MCInst *Inst, uint32_t insn,
        uint64_t Addr, const void *Decoder);
static DecodeStatus DecodeSETMemOpInstruction(MCInst *Inst, uint32_t insn,
        uint64_t Addr, const void *Decoder);


static bool Check(DecodeStatus *Out, DecodeStatus In)
{
  switch (In) {
    default:  // never reach
      return true;

    case MCDisassembler_Success:
      // Out stays the same.
      return true;

    case MCDisassembler_SoftFail:
      *Out = In;
      return true;

    case MCDisassembler_Fail:
      *Out = In;
      return false;
  }
  // llvm_unreachable("Invalid DecodeStatus!");
}

// Hacky: enable all features for disassembler
uint64_t AArch64_getFeatureBits(int feature)
{
  // enable all features
  return (uint64_t)-1;
}

#define GET_SUBTARGETINFO_ENUM
#include "AArch64GenSubtargetInfo.inc"

#include "AArch64GenDisassemblerTables.inc"

#define GET_INSTRINFO_ENUM
#include "AArch64GenInstrInfo.inc"

#define GET_REGINFO_ENUM
#define GET_REGINFO_MC_DESC
#include "AArch64GenRegisterInfo.inc"

#define Success MCDisassembler_Success
#define Fail MCDisassembler_Fail
#define SoftFail MCDisassembler_SoftFail

static DecodeStatus _getInstruction(cs_struct *ud, MCInst *MI,
    const uint8_t *code, size_t code_len,
    uint16_t *Size,
    uint64_t Address, MCRegisterInfo *MRI)
{
  uint32_t insn;
  DecodeStatus result;
  size_t i;

  if (code_len < 4) {
    // not enough data
    *Size = 0;
    return MCDisassembler_Fail;
  }

  if (MI->flat_insn->detail) {
    memset(MI->flat_insn->detail, 0, offsetof(cs_detail, arm64)+sizeof(cs_arm64));
    for (i = 0; i < ARR_SIZE(MI->flat_insn->detail->arm64.operands); i++)
      MI->flat_insn->detail->arm64.operands[i].vector_index = -1;
  }

  if (MODE_IS_BIG_ENDIAN(ud->mode))
    insn = (code[3] << 0) | (code[2] << 8) |
      (code[1] <<  16) | ((uint32_t) code[0] << 24);
  else
    insn = ((uint32_t) code[3] << 24) | (code[2] << 16) |
      (code[1] <<  8) | (code[0] <<  0);

  // Calling the auto-generated decoder function.
  result = decodeInstruction_4(DecoderTable32, MI, insn, Address);
  // If Decoding fails initially, try Fallback table.
  if(result == MCDisassembler_Fail){
    result = decodeInstruction_4(DecoderTableFallback32, MI, insn, Address);  
  }

  // Init new MCOperand to be used in switch below.
  // Kind RegVal set inside a case when needed.
  MCOperand op_storage;
  MCOperand *Op = &op_storage;
  switch (MCInst_getOpcode(MI)) {
      default:
        break;
      // For Scalable Matrix Extension (SME) instructions that have an implicit
      // operand for the accumulator (ZA) which isn't encoded, manually insert
      // operand.
      case AArch64_LDR_ZA:
      case AArch64_STR_ZA: {
      Op->Kind = kRegister;
      Op->RegVal = AArch64_ZA;
      MCInst_insert0(MI, 0, Op);
        // Spill and fill instructions have a single immediate used for both the
        // vector select offset and optional memory offset. Replicate the decoded
        // immediate.
        MCOperand *Imm4Op = MCInst_getOperand(MI, 2);
      //   assert(MCOperand_isImm(Imm4Op) && "Unexpected operand type!");
        MCInst_addOperand2(MI, Imm4Op);
        break;
      }
      case AArch64_LD1_MXIPXX_H_B:
      case AArch64_LD1_MXIPXX_V_B:
      case AArch64_ST1_MXIPXX_H_B:
      case AArch64_ST1_MXIPXX_V_B:
      case AArch64_INSERT_MXIPZ_H_B:
      case AArch64_INSERT_MXIPZ_V_B:
        // e.g.
        // MOVA ZA0<HV>.B[<Ws>, <imm>], <Pg>/M, <Zn>.B
        //      ^ insert implicit 8-bit element tile
      Op->Kind = kRegister;
      Op->RegVal = AArch64_ZAB0;
      MCInst_insert0(MI, 0, Op);
        break;
      case AArch64_EXTRACT_ZPMXI_H_B:
      case AArch64_EXTRACT_ZPMXI_V_B:
        // MOVA <Zd>.B, <Pg>/M, ZA0<HV>.B[<Ws>, <imm>]
        //                      ^ insert implicit 8-bit element tile
      Op->Kind = kRegister;
      Op->RegVal = AArch64_ZAB0;
      MCInst_insert0(MI, 2, Op);
        break;
      case AArch64_LD1_MXIPXX_H_Q:
      case AArch64_LD1_MXIPXX_V_Q:
      case AArch64_ST1_MXIPXX_H_Q:
      case AArch64_ST1_MXIPXX_V_Q:
        // 128-bit load/store have implicit zero vector index.
      Op->Kind = kImmediate;
      Op->ImmVal = 0;
      MCInst_insert0(MI, 2, Op);
        break;
      // 128-bit mova have implicit zero vector index.
      case AArch64_INSERT_MXIPZ_H_Q:
      case AArch64_INSERT_MXIPZ_V_Q:
      Op->Kind = kImmediate;
      Op->ImmVal = 0;
      MCInst_insert0(MI, 2, Op);
        break;
      case AArch64_EXTRACT_ZPMXI_H_Q:
      case AArch64_EXTRACT_ZPMXI_V_Q:
      Op->Kind = kImmediate;
      Op->ImmVal = 0;
      MCInst_addOperand2(MI, Op);
        break;
      case AArch64_SMOVvi8to32_idx0:
      case AArch64_SMOVvi8to64_idx0:
      case AArch64_SMOVvi16to32_idx0:
      case AArch64_SMOVvi16to64_idx0:
      case AArch64_SMOVvi32to64_idx0:
      case AArch64_UMOVvi8_idx0:
      case AArch64_UMOVvi16_idx0:
      case AArch64_UMOVvi32_idx0:
      case AArch64_UMOVvi64_idx0:
      Op->Kind = kImmediate;
      Op->ImmVal = 0;
      MCInst_addOperand2(MI, Op);
        break;
    }

  if (result != MCDisassembler_Fail) {
    *Size = 4;

    return result;
  }

  // invalid code
  MCInst_clear(MI);
  *Size = 0;

  return MCDisassembler_Fail;
}

bool AArch64_getInstruction(csh ud, const uint8_t *code, size_t code_len,
    MCInst *instr, uint16_t *size, uint64_t address, void *info)
{
  DecodeStatus status = _getInstruction((cs_struct *)ud, instr,
      code, code_len,
      size,
      address, (MCRegisterInfo *)info);

  return status == MCDisassembler_Success;
}

static const unsigned FPR128DecoderTable[] = {
  AArch64_Q0,  AArch64_Q1,  AArch64_Q2,  AArch64_Q3,  AArch64_Q4,
  AArch64_Q5,  AArch64_Q6,  AArch64_Q7,  AArch64_Q8,  AArch64_Q9,
  AArch64_Q10, AArch64_Q11, AArch64_Q12, AArch64_Q13, AArch64_Q14,
  AArch64_Q15, AArch64_Q16, AArch64_Q17, AArch64_Q18, AArch64_Q19,
  AArch64_Q20, AArch64_Q21, AArch64_Q22, AArch64_Q23, AArch64_Q24,
  AArch64_Q25, AArch64_Q26, AArch64_Q27, AArch64_Q28, AArch64_Q29,
  AArch64_Q30, AArch64_Q31
};

static DecodeStatus DecodeFPR128RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = FPR128DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeFPR128_loRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  if (RegNo > 15)
    return Fail;

  return DecodeFPR128RegisterClass(Inst, RegNo, Addr, Decoder);
}

static const unsigned FPR64DecoderTable[] = {
  AArch64_D0,  AArch64_D1,  AArch64_D2,  AArch64_D3,  AArch64_D4,
  AArch64_D5,  AArch64_D6,  AArch64_D7,  AArch64_D8,  AArch64_D9,
  AArch64_D10, AArch64_D11, AArch64_D12, AArch64_D13, AArch64_D14,
  AArch64_D15, AArch64_D16, AArch64_D17, AArch64_D18, AArch64_D19,
  AArch64_D20, AArch64_D21, AArch64_D22, AArch64_D23, AArch64_D24,
  AArch64_D25, AArch64_D26, AArch64_D27, AArch64_D28, AArch64_D29,
  AArch64_D30, AArch64_D31
};

static DecodeStatus DecodeFPR64RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = FPR64DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned FPR32DecoderTable[] = {
  AArch64_S0,  AArch64_S1,  AArch64_S2,  AArch64_S3,  AArch64_S4,
  AArch64_S5,  AArch64_S6,  AArch64_S7,  AArch64_S8,  AArch64_S9,
  AArch64_S10, AArch64_S11, AArch64_S12, AArch64_S13, AArch64_S14,
  AArch64_S15, AArch64_S16, AArch64_S17, AArch64_S18, AArch64_S19,
  AArch64_S20, AArch64_S21, AArch64_S22, AArch64_S23, AArch64_S24,
  AArch64_S25, AArch64_S26, AArch64_S27, AArch64_S28, AArch64_S29,
  AArch64_S30, AArch64_S31
};

static DecodeStatus DecodeFPR32RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = FPR32DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned FPR16DecoderTable[] = {
  AArch64_H0,  AArch64_H1,  AArch64_H2,  AArch64_H3,  AArch64_H4,
  AArch64_H5,  AArch64_H6,  AArch64_H7,  AArch64_H8,  AArch64_H9,
  AArch64_H10, AArch64_H11, AArch64_H12, AArch64_H13, AArch64_H14,
  AArch64_H15, AArch64_H16, AArch64_H17, AArch64_H18, AArch64_H19,
  AArch64_H20, AArch64_H21, AArch64_H22, AArch64_H23, AArch64_H24,
  AArch64_H25, AArch64_H26, AArch64_H27, AArch64_H28, AArch64_H29,
  AArch64_H30, AArch64_H31
};

static DecodeStatus DecodeFPR16RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = FPR16DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned FPR8DecoderTable[] = {
  AArch64_B0,  AArch64_B1,  AArch64_B2,  AArch64_B3,  AArch64_B4,
  AArch64_B5,  AArch64_B6,  AArch64_B7,  AArch64_B8,  AArch64_B9,
  AArch64_B10, AArch64_B11, AArch64_B12, AArch64_B13, AArch64_B14,
  AArch64_B15, AArch64_B16, AArch64_B17, AArch64_B18, AArch64_B19,
  AArch64_B20, AArch64_B21, AArch64_B22, AArch64_B23, AArch64_B24,
  AArch64_B25, AArch64_B26, AArch64_B27, AArch64_B28, AArch64_B29,
  AArch64_B30, AArch64_B31
};

static DecodeStatus DecodeFPR8RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = FPR8DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned GPR64DecoderTable[] = {
  AArch64_X0,  AArch64_X1,  AArch64_X2,  AArch64_X3,  AArch64_X4,
  AArch64_X5,  AArch64_X6,  AArch64_X7,  AArch64_X8,  AArch64_X9,
  AArch64_X10, AArch64_X11, AArch64_X12, AArch64_X13, AArch64_X14,
  AArch64_X15, AArch64_X16, AArch64_X17, AArch64_X18, AArch64_X19,
  AArch64_X20, AArch64_X21, AArch64_X22, AArch64_X23, AArch64_X24,
  AArch64_X25, AArch64_X26, AArch64_X27, AArch64_X28, AArch64_FP,
  AArch64_LR,  AArch64_XZR
};

static DecodeStatus DecodeGPR64commonRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 30)
    return Fail;

  Register = GPR64DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeGPR64RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = GPR64DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned GPR64x8DecoderTable[] = {
  AArch64_X0_X1_X2_X3_X4_X5_X6_X7, AArch64_X2_X3_X4_X5_X6_X7_X8_X9, 
  AArch64_X4_X5_X6_X7_X8_X9_X10_X11, AArch64_X6_X7_X8_X9_X10_X11_X12_X13, 
  AArch64_X8_X9_X10_X11_X12_X13_X14_X15, AArch64_X10_X11_X12_X13_X14_X15_X16_X17, 
  AArch64_X12_X13_X14_X15_X16_X17_X18_X19, AArch64_X14_X15_X16_X17_X18_X19_X20_X21, 
  AArch64_X16_X17_X18_X19_X20_X21_X22_X23, AArch64_X18_X19_X20_X21_X22_X23_X24_X25, 
  AArch64_X20_X21_X22_X23_X24_X25_X26_X27, AArch64_X22_X23_X24_X25_X26_X27_X28_FP
};

static DecodeStatus DecodeGPR64x8ClassRegisterClass(MCInst *Inst, unsigned RegNo, 
    uint64_t Address, const void *Decoder) 
{ 
  if (RegNo > 22)
    return Fail;
  if (RegNo & 1)
    return Fail;
  
  unsigned Register = GPR64x8DecoderTable[RegNo >> 1];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeGPR64spRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = GPR64DecoderTable[RegNo];
  if (Register == AArch64_XZR)
    Register = AArch64_SP;

  MCOperand_CreateReg0(Inst, Register);

  return Success;
}


static const unsigned MatrixIndexGPR32_12_15DecoderTable[] = {
  AArch64_W12, AArch64_W13, AArch64_W14, AArch64_W15
};

static DecodeStatus DecodeMatrixIndexGPR32_12_15RegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Addr, const void *Decoder) 
{
  unsigned Register;

  if (RegNo > 3)
      return Fail;
  
  Register = MatrixIndexGPR32_12_15DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

    return Success;
}

static const unsigned GPR32DecoderTable[] = {
  AArch64_W0,  AArch64_W1,  AArch64_W2,  AArch64_W3,  AArch64_W4,
  AArch64_W5,  AArch64_W6,  AArch64_W7,  AArch64_W8,  AArch64_W9,
  AArch64_W10, AArch64_W11, AArch64_W12, AArch64_W13, AArch64_W14,
  AArch64_W15, AArch64_W16, AArch64_W17, AArch64_W18, AArch64_W19,
  AArch64_W20, AArch64_W21, AArch64_W22, AArch64_W23, AArch64_W24,
  AArch64_W25, AArch64_W26, AArch64_W27, AArch64_W28, AArch64_W29,
  AArch64_W30, AArch64_WZR
};

static DecodeStatus DecodeGPR32RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = GPR32DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeGPR32spRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = GPR32DecoderTable[RegNo];
  if (Register == AArch64_WZR)
    Register = AArch64_WSP;

  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned ZPRDecoderTable[] = {
    AArch64_Z0,  AArch64_Z1,  AArch64_Z2,  AArch64_Z3,
    AArch64_Z4,  AArch64_Z5,  AArch64_Z6,  AArch64_Z7,
    AArch64_Z8,  AArch64_Z9,  AArch64_Z10, AArch64_Z11,
    AArch64_Z12, AArch64_Z13, AArch64_Z14, AArch64_Z15,
    AArch64_Z16, AArch64_Z17, AArch64_Z18, AArch64_Z19,
    AArch64_Z20, AArch64_Z21, AArch64_Z22, AArch64_Z23,
    AArch64_Z24, AArch64_Z25, AArch64_Z26, AArch64_Z27,
    AArch64_Z28, AArch64_Z29, AArch64_Z30, AArch64_Z31
};

static DecodeStatus DecodeZPRRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = ZPRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeZPR_4bRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder)
{
  if (RegNo > 15)
    return Fail;

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

static DecodeStatus DecodeZPR_3bRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder)
{
  if (RegNo > 7)
    return Fail;

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

static const unsigned ZZDecoderTable[] = {
  AArch64_Z0_Z1,   AArch64_Z1_Z2,   AArch64_Z2_Z3,   AArch64_Z3_Z4,
  AArch64_Z4_Z5,   AArch64_Z5_Z6,   AArch64_Z6_Z7,   AArch64_Z7_Z8,
  AArch64_Z8_Z9,   AArch64_Z9_Z10,  AArch64_Z10_Z11, AArch64_Z11_Z12,
  AArch64_Z12_Z13, AArch64_Z13_Z14, AArch64_Z14_Z15, AArch64_Z15_Z16,
  AArch64_Z16_Z17, AArch64_Z17_Z18, AArch64_Z18_Z19, AArch64_Z19_Z20,
  AArch64_Z20_Z21, AArch64_Z21_Z22, AArch64_Z22_Z23, AArch64_Z23_Z24,
  AArch64_Z24_Z25, AArch64_Z25_Z26, AArch64_Z26_Z27, AArch64_Z27_Z28,
  AArch64_Z28_Z29, AArch64_Z29_Z30, AArch64_Z30_Z31, AArch64_Z31_Z0
};

static DecodeStatus DecodeZPR2RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = ZZDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned ZZZDecoderTable[] = {
  AArch64_Z0_Z1_Z2,    AArch64_Z1_Z2_Z3,    AArch64_Z2_Z3_Z4,
  AArch64_Z3_Z4_Z5,    AArch64_Z4_Z5_Z6,    AArch64_Z5_Z6_Z7,
  AArch64_Z6_Z7_Z8,    AArch64_Z7_Z8_Z9,    AArch64_Z8_Z9_Z10,
  AArch64_Z9_Z10_Z11,  AArch64_Z10_Z11_Z12, AArch64_Z11_Z12_Z13,
  AArch64_Z12_Z13_Z14, AArch64_Z13_Z14_Z15, AArch64_Z14_Z15_Z16,
  AArch64_Z15_Z16_Z17, AArch64_Z16_Z17_Z18, AArch64_Z17_Z18_Z19,
  AArch64_Z18_Z19_Z20, AArch64_Z19_Z20_Z21, AArch64_Z20_Z21_Z22,
  AArch64_Z21_Z22_Z23, AArch64_Z22_Z23_Z24, AArch64_Z23_Z24_Z25,
  AArch64_Z24_Z25_Z26, AArch64_Z25_Z26_Z27, AArch64_Z26_Z27_Z28,
  AArch64_Z27_Z28_Z29, AArch64_Z28_Z29_Z30, AArch64_Z29_Z30_Z31,
  AArch64_Z30_Z31_Z0,  AArch64_Z31_Z0_Z1
};

static DecodeStatus DecodeZPR3RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = ZZZDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned ZZZZDecoderTable[] = {
  AArch64_Z0_Z1_Z2_Z3,     AArch64_Z1_Z2_Z3_Z4,     AArch64_Z2_Z3_Z4_Z5,
  AArch64_Z3_Z4_Z5_Z6,     AArch64_Z4_Z5_Z6_Z7,     AArch64_Z5_Z6_Z7_Z8,
  AArch64_Z6_Z7_Z8_Z9,     AArch64_Z7_Z8_Z9_Z10,    AArch64_Z8_Z9_Z10_Z11,
  AArch64_Z9_Z10_Z11_Z12,  AArch64_Z10_Z11_Z12_Z13, AArch64_Z11_Z12_Z13_Z14,
  AArch64_Z12_Z13_Z14_Z15, AArch64_Z13_Z14_Z15_Z16, AArch64_Z14_Z15_Z16_Z17,
  AArch64_Z15_Z16_Z17_Z18, AArch64_Z16_Z17_Z18_Z19, AArch64_Z17_Z18_Z19_Z20,
  AArch64_Z18_Z19_Z20_Z21, AArch64_Z19_Z20_Z21_Z22, AArch64_Z20_Z21_Z22_Z23,
  AArch64_Z21_Z22_Z23_Z24, AArch64_Z22_Z23_Z24_Z25, AArch64_Z23_Z24_Z25_Z26,
  AArch64_Z24_Z25_Z26_Z27, AArch64_Z25_Z26_Z27_Z28, AArch64_Z26_Z27_Z28_Z29,
  AArch64_Z27_Z28_Z29_Z30, AArch64_Z28_Z29_Z30_Z31, AArch64_Z29_Z30_Z31_Z0,
  AArch64_Z30_Z31_Z0_Z1,   AArch64_Z31_Z0_Z1_Z2
};

static DecodeStatus DecodeZPR4RegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = ZZZZDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeMatrixTileListRegisterClass(MCInst *Inst,
    unsigned RegMask, uint64_t Address, const void *Decoder) {
  if (RegMask > 0xFF)
      return Fail;
  
  MCOperand_CreateImm0(Inst, RegMask);
  return Success;
}

static const unsigned MatrixZATileDecoderTable[] = {
  AArch64_ZAB0,
    AArch64_ZAH0, AArch64_ZAH1,
    AArch64_ZAS0, AArch64_ZAS1, AArch64_ZAS2, AArch64_ZAS3,
    AArch64_ZAD0, AArch64_ZAD1, AArch64_ZAD2, AArch64_ZAD3,
    AArch64_ZAD4, AArch64_ZAD5, AArch64_ZAD6, AArch64_ZAD7,
    AArch64_ZAQ0, AArch64_ZAQ1, AArch64_ZAQ2, AArch64_ZAQ3,
    AArch64_ZAQ4, AArch64_ZAQ5, AArch64_ZAQ6, AArch64_ZAQ7,
    AArch64_ZAQ8, AArch64_ZAQ9, AArch64_ZAQ10, AArch64_ZAQ11,
    AArch64_ZAQ12, AArch64_ZAQ13, AArch64_ZAQ14, AArch64_ZAQ15
};

static DecodeStatus DecodeMatrixTile(MCInst *Inst, unsigned RegNo,
    uint64_t Address, const void *Decoder, unsigned NumBitsForTile) {
  unsigned LastReg = (1 << NumBitsForTile) - 1;
  if (RegNo > LastReg)
      return Fail;

  // Convert original 2D indexes into 1D table index
  unsigned index = 0;
  switch (NumBitsForTile)
  {
  case 0:
    // Only a single Byte tile at beginning of list so index = 0
    break;
  case 1:
    index = 1 + RegNo;
    break;
  case 2:
    index = 3 + RegNo;
    break;
  case 3:
    index = 7 + RegNo;
    break;
  case 4:
    index = 15 + RegNo;
    break;
  default:
    break;
  }

  MCOperand_CreateReg0(Inst, MatrixZATileDecoderTable[index]);
  return Success;
}


static const unsigned PPRDecoderTable[] = {
  AArch64_P0,  AArch64_P1,  AArch64_P2,  AArch64_P3,
  AArch64_P4,  AArch64_P5,  AArch64_P6,  AArch64_P7,
  AArch64_P8,  AArch64_P9,  AArch64_P10, AArch64_P11,
  AArch64_P12, AArch64_P13, AArch64_P14, AArch64_P15
};

static DecodeStatus DecodePPRRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 15)
    return Fail;

  Register = PPRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodePPR_3bRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  if (RegNo > 7)
    return Fail;

  // Just reuse the PPR decode table
  return DecodePPRRegisterClass(Inst, RegNo, Addr, Decoder);
}

static const unsigned VectorDecoderTable[] = {
  AArch64_Q0,  AArch64_Q1,  AArch64_Q2,  AArch64_Q3,  AArch64_Q4,
  AArch64_Q5,  AArch64_Q6,  AArch64_Q7,  AArch64_Q8,  AArch64_Q9,
  AArch64_Q10, AArch64_Q11, AArch64_Q12, AArch64_Q13, AArch64_Q14,
  AArch64_Q15, AArch64_Q16, AArch64_Q17, AArch64_Q18, AArch64_Q19,
  AArch64_Q20, AArch64_Q21, AArch64_Q22, AArch64_Q23, AArch64_Q24,
  AArch64_Q25, AArch64_Q26, AArch64_Q27, AArch64_Q28, AArch64_Q29,
  AArch64_Q30, AArch64_Q31
};

static DecodeStatus DecodeVectorRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = VectorDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned QQDecoderTable[] = {
  AArch64_Q0_Q1,   AArch64_Q1_Q2,   AArch64_Q2_Q3,   AArch64_Q3_Q4,
  AArch64_Q4_Q5,   AArch64_Q5_Q6,   AArch64_Q6_Q7,   AArch64_Q7_Q8,
  AArch64_Q8_Q9,   AArch64_Q9_Q10,  AArch64_Q10_Q11, AArch64_Q11_Q12,
  AArch64_Q12_Q13, AArch64_Q13_Q14, AArch64_Q14_Q15, AArch64_Q15_Q16,
  AArch64_Q16_Q17, AArch64_Q17_Q18, AArch64_Q18_Q19, AArch64_Q19_Q20,
  AArch64_Q20_Q21, AArch64_Q21_Q22, AArch64_Q22_Q23, AArch64_Q23_Q24,
  AArch64_Q24_Q25, AArch64_Q25_Q26, AArch64_Q26_Q27, AArch64_Q27_Q28,
  AArch64_Q28_Q29, AArch64_Q29_Q30, AArch64_Q30_Q31, AArch64_Q31_Q0
};

static DecodeStatus DecodeQQRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = QQDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned QQQDecoderTable[] = {
  AArch64_Q0_Q1_Q2,    AArch64_Q1_Q2_Q3,    AArch64_Q2_Q3_Q4,
  AArch64_Q3_Q4_Q5,    AArch64_Q4_Q5_Q6,    AArch64_Q5_Q6_Q7,
  AArch64_Q6_Q7_Q8,    AArch64_Q7_Q8_Q9,    AArch64_Q8_Q9_Q10,
  AArch64_Q9_Q10_Q11,  AArch64_Q10_Q11_Q12, AArch64_Q11_Q12_Q13,
  AArch64_Q12_Q13_Q14, AArch64_Q13_Q14_Q15, AArch64_Q14_Q15_Q16,
  AArch64_Q15_Q16_Q17, AArch64_Q16_Q17_Q18, AArch64_Q17_Q18_Q19,
  AArch64_Q18_Q19_Q20, AArch64_Q19_Q20_Q21, AArch64_Q20_Q21_Q22,
  AArch64_Q21_Q22_Q23, AArch64_Q22_Q23_Q24, AArch64_Q23_Q24_Q25,
  AArch64_Q24_Q25_Q26, AArch64_Q25_Q26_Q27, AArch64_Q26_Q27_Q28,
  AArch64_Q27_Q28_Q29, AArch64_Q28_Q29_Q30, AArch64_Q29_Q30_Q31,
  AArch64_Q30_Q31_Q0,  AArch64_Q31_Q0_Q1
};

static DecodeStatus DecodeQQQRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = QQQDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned QQQQDecoderTable[] = {
  AArch64_Q0_Q1_Q2_Q3,     AArch64_Q1_Q2_Q3_Q4,     AArch64_Q2_Q3_Q4_Q5,
  AArch64_Q3_Q4_Q5_Q6,     AArch64_Q4_Q5_Q6_Q7,     AArch64_Q5_Q6_Q7_Q8,
  AArch64_Q6_Q7_Q8_Q9,     AArch64_Q7_Q8_Q9_Q10,    AArch64_Q8_Q9_Q10_Q11,
  AArch64_Q9_Q10_Q11_Q12,  AArch64_Q10_Q11_Q12_Q13, AArch64_Q11_Q12_Q13_Q14,
  AArch64_Q12_Q13_Q14_Q15, AArch64_Q13_Q14_Q15_Q16, AArch64_Q14_Q15_Q16_Q17,
  AArch64_Q15_Q16_Q17_Q18, AArch64_Q16_Q17_Q18_Q19, AArch64_Q17_Q18_Q19_Q20,
  AArch64_Q18_Q19_Q20_Q21, AArch64_Q19_Q20_Q21_Q22, AArch64_Q20_Q21_Q22_Q23,
  AArch64_Q21_Q22_Q23_Q24, AArch64_Q22_Q23_Q24_Q25, AArch64_Q23_Q24_Q25_Q26,
  AArch64_Q24_Q25_Q26_Q27, AArch64_Q25_Q26_Q27_Q28, AArch64_Q26_Q27_Q28_Q29,
  AArch64_Q27_Q28_Q29_Q30, AArch64_Q28_Q29_Q30_Q31, AArch64_Q29_Q30_Q31_Q0,
  AArch64_Q30_Q31_Q0_Q1,   AArch64_Q31_Q0_Q1_Q2
};

static DecodeStatus DecodeQQQQRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = QQQQDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned DDDecoderTable[] = {
  AArch64_D0_D1,   AArch64_D1_D2,   AArch64_D2_D3,   AArch64_D3_D4,
  AArch64_D4_D5,   AArch64_D5_D6,   AArch64_D6_D7,   AArch64_D7_D8,
  AArch64_D8_D9,   AArch64_D9_D10,  AArch64_D10_D11, AArch64_D11_D12,
  AArch64_D12_D13, AArch64_D13_D14, AArch64_D14_D15, AArch64_D15_D16,
  AArch64_D16_D17, AArch64_D17_D18, AArch64_D18_D19, AArch64_D19_D20,
  AArch64_D20_D21, AArch64_D21_D22, AArch64_D22_D23, AArch64_D23_D24,
  AArch64_D24_D25, AArch64_D25_D26, AArch64_D26_D27, AArch64_D27_D28,
  AArch64_D28_D29, AArch64_D29_D30, AArch64_D30_D31, AArch64_D31_D0
};

static DecodeStatus DecodeDDRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = DDDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned DDDDecoderTable[] = {
  AArch64_D0_D1_D2,    AArch64_D1_D2_D3,    AArch64_D2_D3_D4,
  AArch64_D3_D4_D5,    AArch64_D4_D5_D6,    AArch64_D5_D6_D7,
  AArch64_D6_D7_D8,    AArch64_D7_D8_D9,    AArch64_D8_D9_D10,
  AArch64_D9_D10_D11,  AArch64_D10_D11_D12, AArch64_D11_D12_D13,
  AArch64_D12_D13_D14, AArch64_D13_D14_D15, AArch64_D14_D15_D16,
  AArch64_D15_D16_D17, AArch64_D16_D17_D18, AArch64_D17_D18_D19,
  AArch64_D18_D19_D20, AArch64_D19_D20_D21, AArch64_D20_D21_D22,
  AArch64_D21_D22_D23, AArch64_D22_D23_D24, AArch64_D23_D24_D25,
  AArch64_D24_D25_D26, AArch64_D25_D26_D27, AArch64_D26_D27_D28,
  AArch64_D27_D28_D29, AArch64_D28_D29_D30, AArch64_D29_D30_D31,
  AArch64_D30_D31_D0,  AArch64_D31_D0_D1
};

static DecodeStatus DecodeDDDRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = DDDDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static const unsigned DDDDDecoderTable[] = {
  AArch64_D0_D1_D2_D3,     AArch64_D1_D2_D3_D4,     AArch64_D2_D3_D4_D5,
  AArch64_D3_D4_D5_D6,     AArch64_D4_D5_D6_D7,     AArch64_D5_D6_D7_D8,
  AArch64_D6_D7_D8_D9,     AArch64_D7_D8_D9_D10,    AArch64_D8_D9_D10_D11,
  AArch64_D9_D10_D11_D12,  AArch64_D10_D11_D12_D13, AArch64_D11_D12_D13_D14,
  AArch64_D12_D13_D14_D15, AArch64_D13_D14_D15_D16, AArch64_D14_D15_D16_D17,
  AArch64_D15_D16_D17_D18, AArch64_D16_D17_D18_D19, AArch64_D17_D18_D19_D20,
  AArch64_D18_D19_D20_D21, AArch64_D19_D20_D21_D22, AArch64_D20_D21_D22_D23,
  AArch64_D21_D22_D23_D24, AArch64_D22_D23_D24_D25, AArch64_D23_D24_D25_D26,
  AArch64_D24_D25_D26_D27, AArch64_D25_D26_D27_D28, AArch64_D26_D27_D28_D29,
  AArch64_D27_D28_D29_D30, AArch64_D28_D29_D30_D31, AArch64_D29_D30_D31_D0,
  AArch64_D30_D31_D0_D1,   AArch64_D31_D0_D1_D2
};

static DecodeStatus DecodeDDDDRegisterClass(MCInst *Inst, unsigned RegNo,
    uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  if (RegNo > 31)
    return Fail;

  Register = DDDDDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeFixedPointScaleImm32(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  // scale{5} is asserted as 1 in tblgen.
  Imm |= 0x20;
  MCOperand_CreateImm0(Inst, 64 - Imm);

  return Success;
}

static DecodeStatus DecodeFixedPointScaleImm64(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  MCOperand_CreateImm0(Inst, 64 - Imm);

  return Success;
}

static DecodeStatus DecodePCRelLabel19(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  int64_t ImmVal = Imm;

  // Sign-extend 19-bit immediate.
  if (ImmVal & (1 << (19 - 1)))
    ImmVal |= ~((1LL << 19) - 1);

  MCOperand_CreateImm0(Inst, ImmVal);

  return Success;
}

static DecodeStatus DecodeMemExtend(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder)
{
  MCOperand_CreateImm0(Inst, (Imm  >> 1) & 1);
  MCOperand_CreateImm0(Inst, Imm & 1);

  return Success;
}

static DecodeStatus DecodeMRSSystemRegister(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder)
{
  MCOperand_CreateImm0(Inst, Imm);

  // Every system register in the encoding space is valid with the syntax
  // S<op0>_<op1>_<Cn>_<Cm>_<op2>, so decoding system registers always succeeds.
  return Success;
}

static DecodeStatus DecodeMSRSystemRegister(MCInst *Inst, unsigned Imm,
    uint64_t Address, const void *Decoder)
{
  MCOperand_CreateImm0(Inst, Imm);

  return Success;
}

static DecodeStatus DecodeFMOVLaneInstruction(MCInst *Inst, unsigned Insn,
    uint64_t Address, const void *Decoder)
{
  // This decoder exists to add the dummy Lane operand to the MCInst, which must
  // be 1 in assembly but has no other real manifestation.
  unsigned Rd = fieldFromInstruction_4(Insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(Insn, 5, 5);
  unsigned IsToVec = fieldFromInstruction_4(Insn, 16, 1);

  if (IsToVec) {
    DecodeFPR128RegisterClass(Inst, Rd, Address, Decoder);
    DecodeGPR64RegisterClass(Inst, Rn, Address, Decoder);
  } else {
    DecodeGPR64RegisterClass(Inst, Rd, Address, Decoder);
    DecodeFPR128RegisterClass(Inst, Rn, Address, Decoder);
  }

  // Add the lane
  MCOperand_CreateImm0(Inst, 1);

  return Success;
}

static DecodeStatus DecodeVecShiftRImm(MCInst *Inst, unsigned Imm,
    unsigned Add)
{
  MCOperand_CreateImm0(Inst, Add - Imm);

  return Success;
}

static DecodeStatus DecodeVecShiftLImm(MCInst *Inst, unsigned Imm,
    unsigned Add)
{
  MCOperand_CreateImm0(Inst, (Imm + Add) & (Add - 1));

  return Success;
}

static DecodeStatus DecodeVecShiftR64Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm, 64);
}

static DecodeStatus DecodeVecShiftR64ImmNarrow(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm | 0x20, 64);
}

static DecodeStatus DecodeVecShiftR32Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm, 32);
}

static DecodeStatus DecodeVecShiftR32ImmNarrow(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm | 0x10, 32);
}

static DecodeStatus DecodeVecShiftR16Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm, 16);
}

static DecodeStatus DecodeVecShiftR16ImmNarrow(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm | 0x8, 16);
}

static DecodeStatus DecodeVecShiftR8Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftRImm(Inst, Imm, 8);
}

static DecodeStatus DecodeVecShiftL64Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftLImm(Inst, Imm, 64);
}

static DecodeStatus DecodeVecShiftL32Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftLImm(Inst, Imm, 32);
}

static DecodeStatus DecodeVecShiftL16Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftLImm(Inst, Imm, 16);
}

static DecodeStatus DecodeVecShiftL8Imm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  return DecodeVecShiftLImm(Inst, Imm, 8);
}

static DecodeStatus DecodeThreeAddrSRegInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  unsigned Rm = fieldFromInstruction_4(insn, 16, 5);
  unsigned shiftHi = fieldFromInstruction_4(insn, 22, 2);
  unsigned shiftLo = fieldFromInstruction_4(insn, 10, 6);
  unsigned shift = (shiftHi << 6) | shiftLo;

  switch (MCInst_getOpcode(Inst)) {
    default:
      return Fail;

    case AArch64_ADDWrs:
    case AArch64_ADDSWrs:
    case AArch64_SUBWrs:
    case AArch64_SUBSWrs:
      // if shift == '11' then ReservedValue()
      if (shiftHi == 0x3)
        return Fail;
      // Deliberate fallthrough

    case AArch64_ANDWrs:
    case AArch64_ANDSWrs:
    case AArch64_BICWrs:
    case AArch64_BICSWrs:
    case AArch64_ORRWrs:
    case AArch64_ORNWrs:
    case AArch64_EORWrs:
    case AArch64_EONWrs: {
      // if sf == '0' and imm6<5> == '1' then ReservedValue()
      if (shiftLo >> 5 == 1)
        return Fail;

      DecodeGPR32RegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rm, Addr, Decoder);
      break;
    }

    case AArch64_ADDXrs:
    case AArch64_ADDSXrs:
    case AArch64_SUBXrs:
    case AArch64_SUBSXrs:
       // if shift == '11' then ReservedValue()
       if (shiftHi == 0x3)
         return Fail;
       // Deliberate fallthrough

    case AArch64_ANDXrs:
    case AArch64_ANDSXrs:
    case AArch64_BICXrs:
    case AArch64_BICSXrs:
    case AArch64_ORRXrs:
    case AArch64_ORNXrs:
    case AArch64_EORXrs:
    case AArch64_EONXrs:
      DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR64RegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR64RegisterClass(Inst, Rm, Addr, Decoder);
      break;
  }

  MCOperand_CreateImm0(Inst, shift);

  return Success;
}

static DecodeStatus DecodeMoveImmInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  unsigned imm = fieldFromInstruction_4(insn, 5, 16);
  unsigned shift = fieldFromInstruction_4(insn, 21, 2);

  shift <<= 4;

  switch (MCInst_getOpcode(Inst)) {
    default:
      return Fail;

    case AArch64_MOVZWi:
    case AArch64_MOVNWi:
    case AArch64_MOVKWi:
      if (shift & (1U << 5))
        return Fail;
      DecodeGPR32RegisterClass(Inst, Rd, Addr, Decoder);
      break;

    case AArch64_MOVZXi:
    case AArch64_MOVNXi:
    case AArch64_MOVKXi:
      DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
      break;
  }

  if (MCInst_getOpcode(Inst) == AArch64_MOVKWi ||
      MCInst_getOpcode(Inst) == AArch64_MOVKXi)
    MCInst_addOperand2(Inst, MCInst_getOperand(Inst, 0));

  MCOperand_CreateImm0(Inst, imm);
  MCOperand_CreateImm0(Inst, shift);

  return Success;
}

static DecodeStatus DecodeUnsignedLdStInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  unsigned Rt = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  unsigned offset = fieldFromInstruction_4(insn, 10, 12);

  switch (MCInst_getOpcode(Inst)) {
    default:
      return Fail;

    case AArch64_PRFMui:
      // Rt is an immediate in prefetch.
      MCOperand_CreateImm0(Inst, Rt);
      break;

    case AArch64_STRBBui:
    case AArch64_LDRBBui:
    case AArch64_LDRSBWui:
    case AArch64_STRHHui:
    case AArch64_LDRHHui:
    case AArch64_LDRSHWui:
    case AArch64_STRWui:
    case AArch64_LDRWui:
      DecodeGPR32RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDRSBXui:
    case AArch64_LDRSHXui:
    case AArch64_LDRSWui:
    case AArch64_STRXui:
    case AArch64_LDRXui:
      DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDRQui:
    case AArch64_STRQui:
      DecodeFPR128RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDRDui:
    case AArch64_STRDui:
      DecodeFPR64RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDRSui:
    case AArch64_STRSui:
      DecodeFPR32RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDRHui:
    case AArch64_STRHui:
      DecodeFPR16RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDRBui:
    case AArch64_STRBui:
      DecodeFPR8RegisterClass(Inst, Rt, Addr, Decoder);
      break;
  }

  DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);

  //if (!Dis->tryAddingSymbolicOperand(Inst, offset, Addr, Fail, 0, 4))
  MCOperand_CreateImm0(Inst, offset);

  return Success;
}

static DecodeStatus DecodeSignedLdStInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  bool IsLoad, IsIndexed, IsFP;
  unsigned Rt = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  int64_t offset = fieldFromInstruction_4(insn, 12, 9);

  // offset is a 9-bit signed immediate, so sign extend it to
  // fill the unsigned.
  if (offset & (1 << (9 - 1)))
    offset |= ~((1LL << 9) - 1);

  // First operand is always the writeback to the address register, if needed.
  switch (MCInst_getOpcode(Inst)) {
    default:
      break;

    case AArch64_LDRSBWpre:
    case AArch64_LDRSHWpre:
    case AArch64_STRBBpre:
    case AArch64_LDRBBpre:
    case AArch64_STRHHpre:
    case AArch64_LDRHHpre:
    case AArch64_STRWpre:
    case AArch64_LDRWpre:
    case AArch64_LDRSBWpost:
    case AArch64_LDRSHWpost:
    case AArch64_STRBBpost:
    case AArch64_LDRBBpost:
    case AArch64_STRHHpost:
    case AArch64_LDRHHpost:
    case AArch64_STRWpost:
    case AArch64_LDRWpost:
    case AArch64_LDRSBXpre:
    case AArch64_LDRSHXpre:
    case AArch64_STRXpre:
    case AArch64_LDRSWpre:
    case AArch64_LDRXpre:
    case AArch64_LDRSBXpost:
    case AArch64_LDRSHXpost:
    case AArch64_STRXpost:
    case AArch64_LDRSWpost:
    case AArch64_LDRXpost:
    case AArch64_LDRQpre:
    case AArch64_STRQpre:
    case AArch64_LDRQpost:
    case AArch64_STRQpost:
    case AArch64_LDRDpre:
    case AArch64_STRDpre:
    case AArch64_LDRDpost:
    case AArch64_STRDpost:
    case AArch64_LDRSpre:
    case AArch64_STRSpre:
    case AArch64_LDRSpost:
    case AArch64_STRSpost:
    case AArch64_LDRHpre:
    case AArch64_STRHpre:
    case AArch64_LDRHpost:
    case AArch64_STRHpost:
    case AArch64_LDRBpre:
    case AArch64_STRBpre:
    case AArch64_LDRBpost:
    case AArch64_STRBpost:
      DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
      break;
  }

  switch (MCInst_getOpcode(Inst)) {
    default:
      return Fail;

    case AArch64_PRFUMi:
      // Rt is an immediate in prefetch.
      MCOperand_CreateImm0(Inst, Rt);
      break;

    case AArch64_STURBBi:
    case AArch64_LDURBBi:
    case AArch64_LDURSBWi:
    case AArch64_STURHHi:
    case AArch64_LDURHHi:
    case AArch64_LDURSHWi:
    case AArch64_STURWi:
    case AArch64_LDURWi:
    case AArch64_LDTRSBWi:
    case AArch64_LDTRSHWi:
    case AArch64_STTRWi:
    case AArch64_LDTRWi:
    case AArch64_STTRHi:
    case AArch64_LDTRHi:
    case AArch64_LDTRBi:
    case AArch64_STTRBi:
    case AArch64_LDRSBWpre:
    case AArch64_LDRSHWpre:
    case AArch64_STRBBpre:
    case AArch64_LDRBBpre:
    case AArch64_STRHHpre:
    case AArch64_LDRHHpre:
    case AArch64_STRWpre:
    case AArch64_LDRWpre:
    case AArch64_LDRSBWpost:
    case AArch64_LDRSHWpost:
    case AArch64_STRBBpost:
    case AArch64_LDRBBpost:
    case AArch64_STRHHpost:
    case AArch64_LDRHHpost:
    case AArch64_STRWpost:
    case AArch64_LDRWpost:
    case AArch64_STLURBi:
    case AArch64_STLURHi:
    case AArch64_STLURWi:
    case AArch64_LDAPURBi:
    case AArch64_LDAPURSBWi:
    case AArch64_LDAPURHi:
    case AArch64_LDAPURSHWi:
    case AArch64_LDAPURi:
      DecodeGPR32RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDURSBXi:
    case AArch64_LDURSHXi:
    case AArch64_LDURSWi:
    case AArch64_STURXi:
    case AArch64_LDURXi:
    case AArch64_LDTRSBXi:
    case AArch64_LDTRSHXi:
    case AArch64_LDTRSWi:
    case AArch64_STTRXi:
    case AArch64_LDTRXi:
    case AArch64_LDRSBXpre:
    case AArch64_LDRSHXpre:
    case AArch64_STRXpre:
    case AArch64_LDRSWpre:
    case AArch64_LDRXpre:
    case AArch64_LDRSBXpost:
    case AArch64_LDRSHXpost:
    case AArch64_STRXpost:
    case AArch64_LDRSWpost:
    case AArch64_LDRXpost:
    case AArch64_LDAPURSWi:
    case AArch64_LDAPURSHXi:
    case AArch64_LDAPURSBXi:
    case AArch64_STLURXi:
    case AArch64_LDAPURXi:
      DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDURQi:
    case AArch64_STURQi:
    case AArch64_LDRQpre:
    case AArch64_STRQpre:
    case AArch64_LDRQpost:
    case AArch64_STRQpost:
      DecodeFPR128RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDURDi:
    case AArch64_STURDi:
    case AArch64_LDRDpre:
    case AArch64_STRDpre:
    case AArch64_LDRDpost:
    case AArch64_STRDpost:
      DecodeFPR64RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDURSi:
    case AArch64_STURSi:
    case AArch64_LDRSpre:
    case AArch64_STRSpre:
    case AArch64_LDRSpost:
    case AArch64_STRSpost:
      DecodeFPR32RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDURHi:
    case AArch64_STURHi:
    case AArch64_LDRHpre:
    case AArch64_STRHpre:
    case AArch64_LDRHpost:
    case AArch64_STRHpost:
      DecodeFPR16RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_LDURBi:
    case AArch64_STURBi:
    case AArch64_LDRBpre:
    case AArch64_STRBpre:
    case AArch64_LDRBpost:
    case AArch64_STRBpost:
      DecodeFPR8RegisterClass(Inst, Rt, Addr, Decoder);
      break;
  }

  DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
  MCOperand_CreateImm0(Inst, offset);

  IsLoad = fieldFromInstruction_4(insn, 22, 1) != 0;
  IsIndexed = fieldFromInstruction_4(insn, 10, 2) != 0;
  IsFP = fieldFromInstruction_4(insn, 26, 1) != 0;

  // Cannot write back to a transfer register (but xzr != sp).
  if (IsLoad && IsIndexed && !IsFP && Rn != 31 && Rt == Rn)
    return SoftFail;

  return Success;
}

static DecodeStatus DecodeExclusiveLdStInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  unsigned Rt = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  unsigned Rt2 = fieldFromInstruction_4(insn, 10, 5);
  unsigned Rs = fieldFromInstruction_4(insn, 16, 5);
  unsigned Opcode = MCInst_getOpcode(Inst);

  switch (Opcode) {
    default:
      return Fail;

    case AArch64_STLXRW:
    case AArch64_STLXRB:
    case AArch64_STLXRH:
    case AArch64_STXRW:
    case AArch64_STXRB:
    case AArch64_STXRH:
      DecodeGPR32RegisterClass(Inst, Rs, Addr, Decoder);
      // FALLTHROUGH
    case AArch64_LDARW:
    case AArch64_LDARB:
    case AArch64_LDARH:
    case AArch64_LDAXRW:
    case AArch64_LDAXRB:
    case AArch64_LDAXRH:
    case AArch64_LDXRW:
    case AArch64_LDXRB:
    case AArch64_LDXRH:
    case AArch64_STLRW:
    case AArch64_STLRB:
    case AArch64_STLRH:
    case AArch64_STLLRW:
    case AArch64_STLLRB:
    case AArch64_STLLRH:
    case AArch64_LDLARW:
    case AArch64_LDLARB:
    case AArch64_LDLARH:
      DecodeGPR32RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_STLXRX:
    case AArch64_STXRX:
      DecodeGPR32RegisterClass(Inst, Rs, Addr, Decoder);
      // FALLTHROUGH
    case AArch64_LDARX:
    case AArch64_LDAXRX:
    case AArch64_LDXRX:
    case AArch64_STLRX:
    case AArch64_LDLARX:
    case AArch64_STLLRX:
      DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);
      break;

    case AArch64_STLXPW:
    case AArch64_STXPW:
      DecodeGPR32RegisterClass(Inst, Rs, Addr, Decoder);
      // FALLTHROUGH
    case AArch64_LDAXPW:
    case AArch64_LDXPW:
      DecodeGPR32RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rt2, Addr, Decoder);
      break;

    case AArch64_STLXPX:
    case AArch64_STXPX:
      DecodeGPR32RegisterClass(Inst, Rs, Addr, Decoder);
      // FALLTHROUGH
    case AArch64_LDAXPX:
    case AArch64_LDXPX:
      DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeGPR64RegisterClass(Inst, Rt2, Addr, Decoder);
      break;
  }

  DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);

  // You shouldn't load to the same register twice in an instruction...
  if ((Opcode == AArch64_LDAXPW || Opcode == AArch64_LDXPW ||
    Opcode == AArch64_LDAXPX || Opcode == AArch64_LDXPX) &&
    Rt == Rt2)
    return SoftFail;

  return Success;
}

static DecodeStatus DecodePairLdStInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  unsigned Rt = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  unsigned Rt2 = fieldFromInstruction_4(insn, 10, 5);
  int32_t offset = fieldFromInstruction_4(insn, 15, 7);
  bool IsLoad = fieldFromInstruction_4(insn, 22, 1) != 0;
  unsigned Opcode = MCInst_getOpcode(Inst);
  bool NeedsDisjointWritebackTransfer = false;

  // offset is a 7-bit signed immediate, so sign extend it to
  // fill the unsigned.
  if (offset & (1 << (7 - 1)))
    offset |= ~((1LL << 7) - 1);

  // First operand is always writeback of base register.
  switch (Opcode) {
    default:
      break;

    case AArch64_LDPXpost:
    case AArch64_STPXpost:
    case AArch64_LDPSWpost:
    case AArch64_LDPXpre:
    case AArch64_STPXpre:
    case AArch64_LDPSWpre:
    case AArch64_LDPWpost:
    case AArch64_STPWpost:
    case AArch64_LDPWpre:
    case AArch64_STPWpre:
    case AArch64_LDPQpost:
    case AArch64_STPQpost:
    case AArch64_LDPQpre:
    case AArch64_STPQpre:
    case AArch64_LDPDpost:
    case AArch64_STPDpost:
    case AArch64_LDPDpre:
    case AArch64_STPDpre:
    case AArch64_LDPSpost:
    case AArch64_STPSpost:
    case AArch64_LDPSpre:
    case AArch64_STPSpre:
      DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
      break;
  }

  switch (Opcode) {
    default:
      return Fail;

    case AArch64_LDPXpost:
    case AArch64_STPXpost:
    case AArch64_LDPSWpost:
    case AArch64_LDPXpre:
    case AArch64_STPXpre:
    case AArch64_LDPSWpre:
      NeedsDisjointWritebackTransfer = true;
      // Fallthrough
    case AArch64_LDNPXi:
    case AArch64_STNPXi:
    case AArch64_LDPXi:
    case AArch64_STPXi:
    case AArch64_LDPSWi:
      DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeGPR64RegisterClass(Inst, Rt2, Addr, Decoder);
      break;

    case AArch64_LDPWpost:
    case AArch64_STPWpost:
    case AArch64_LDPWpre:
    case AArch64_STPWpre:
      NeedsDisjointWritebackTransfer = true;
      // Fallthrough
    case AArch64_LDNPWi:
    case AArch64_STNPWi:
    case AArch64_LDPWi:
    case AArch64_STPWi:
      DecodeGPR32RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rt2, Addr, Decoder);
      break;

    case AArch64_LDNPQi:
    case AArch64_STNPQi:
    case AArch64_LDPQpost:
    case AArch64_STPQpost:
    case AArch64_LDPQi:
    case AArch64_STPQi:
    case AArch64_LDPQpre:
    case AArch64_STPQpre:
      DecodeFPR128RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeFPR128RegisterClass(Inst, Rt2, Addr, Decoder);
      break;

    case AArch64_LDNPDi:
    case AArch64_STNPDi:
    case AArch64_LDPDpost:
    case AArch64_STPDpost:
    case AArch64_LDPDi:
    case AArch64_STPDi:
    case AArch64_LDPDpre:
    case AArch64_STPDpre:
      DecodeFPR64RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeFPR64RegisterClass(Inst, Rt2, Addr, Decoder);
      break;

    case AArch64_LDNPSi:
    case AArch64_STNPSi:
    case AArch64_LDPSpost:
    case AArch64_STPSpost:
    case AArch64_LDPSi:
    case AArch64_STPSi:
    case AArch64_LDPSpre:
    case AArch64_STPSpre:
      DecodeFPR32RegisterClass(Inst, Rt, Addr, Decoder);
      DecodeFPR32RegisterClass(Inst, Rt2, Addr, Decoder);
      break;
  }

  DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
  MCOperand_CreateImm0(Inst, offset);

  // You shouldn't load to the same register twice in an instruction...
  if (IsLoad && Rt == Rt2)
    return SoftFail;

  // ... or do any operation that writes-back to a transfer register. But note
  // that "stp xzr, xzr, [sp], #4" is fine because xzr and sp are different.
  if (NeedsDisjointWritebackTransfer && Rn != 31 && (Rt == Rn || Rt2 == Rn))
    return SoftFail;

  return Success;
}

static DecodeStatus DecodeAuthLoadInstruction(MCInst *Inst, uint32_t insn, 
    uint64_t Addr, const void *Decoder) 
{
  unsigned Rt = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  uint64_t offset = fieldFromInstruction_4(insn, 22, 1) << 9 |
            fieldFromInstruction_4(insn, 12, 9);
  unsigned writeback = fieldFromInstruction_4(insn, 11, 1);

  switch (MCInst_getOpcode(Inst)) {
  default:
    return Fail;
  case AArch64_LDRAAwriteback:
  case AArch64_LDRABwriteback:
    DecodeGPR64spRegisterClass(Inst, Rn /* writeback register */, Addr,
                Decoder);
    break;
  case AArch64_LDRAAindexed:
  case AArch64_LDRABindexed:
    break;
  }

  DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);
  DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
  DecodeSImm(Inst, offset, Addr, Decoder, 10);

  if (writeback && Rt == Rn && Rn != 31) {
    return SoftFail;
  }

  return Success;
}

static DecodeStatus DecodeAddSubERegInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  unsigned Rd, Rn, Rm;
  unsigned extend = fieldFromInstruction_4(insn, 10, 6);
  unsigned shift = extend & 0x7;

  if (shift > 4)
    return Fail;

  Rd = fieldFromInstruction_4(insn, 0, 5);
  Rn = fieldFromInstruction_4(insn, 5, 5);
  Rm = fieldFromInstruction_4(insn, 16, 5);

  switch (MCInst_getOpcode(Inst)) {
    default:
      return Fail;

    case AArch64_ADDWrx:
    case AArch64_SUBWrx:
      DecodeGPR32spRegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR32spRegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rm, Addr, Decoder);
      break;

    case AArch64_ADDSWrx:
    case AArch64_SUBSWrx:
      DecodeGPR32RegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR32spRegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rm, Addr, Decoder);
      break;

    case AArch64_ADDXrx:
    case AArch64_SUBXrx:
      DecodeGPR64spRegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rm, Addr, Decoder);
      break;

    case AArch64_ADDSXrx:
    case AArch64_SUBSXrx:
      DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR32RegisterClass(Inst, Rm, Addr, Decoder);
      break;

    case AArch64_ADDXrx64:
    case AArch64_SUBXrx64:
      DecodeGPR64spRegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR64RegisterClass(Inst, Rm, Addr, Decoder);
      break;

    case AArch64_SUBSXrx64:
    case AArch64_ADDSXrx64:
      DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
      DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
      DecodeGPR64RegisterClass(Inst, Rm, Addr, Decoder);
      break;
  }

  MCOperand_CreateImm0(Inst, extend);

  return Success;
}

static DecodeStatus DecodeLogicalImmInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  unsigned Datasize = fieldFromInstruction_4(insn, 31, 1);
  unsigned imm;

  if (Datasize) {
    if (MCInst_getOpcode(Inst) == AArch64_ANDSXri)
      DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
    else
      DecodeGPR64spRegisterClass(Inst, Rd, Addr, Decoder);

    DecodeGPR64RegisterClass(Inst, Rn, Addr, Decoder);

    imm = fieldFromInstruction_4(insn, 10, 13);
    if (!AArch64_AM_isValidDecodeLogicalImmediate(imm, 64))
      return Fail;
  } else {
    if (MCInst_getOpcode(Inst) == AArch64_ANDSWri)
      DecodeGPR32RegisterClass(Inst, Rd, Addr, Decoder);
    else
      DecodeGPR32spRegisterClass(Inst, Rd, Addr, Decoder);

    DecodeGPR32RegisterClass(Inst, Rn, Addr, Decoder);

    imm = fieldFromInstruction_4(insn, 10, 12);
    if (!AArch64_AM_isValidDecodeLogicalImmediate(imm, 32))
      return Fail;
  }

  MCOperand_CreateImm0(Inst, imm);

  return Success;
}

static DecodeStatus DecodeModImmInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  unsigned cmode = fieldFromInstruction_4(insn, 12, 4);
  unsigned imm = fieldFromInstruction_4(insn, 16, 3) << 5;
  imm |= fieldFromInstruction_4(insn, 5, 5);

  if (MCInst_getOpcode(Inst) == AArch64_MOVID)
    DecodeFPR64RegisterClass(Inst, Rd, Addr, Decoder);
  else
    DecodeVectorRegisterClass(Inst, Rd, Addr, Decoder);

  MCOperand_CreateImm0(Inst, imm);

  switch (MCInst_getOpcode(Inst)) {
    default:
      break;

    case AArch64_MOVIv4i16:
    case AArch64_MOVIv8i16:
    case AArch64_MVNIv4i16:
    case AArch64_MVNIv8i16:
    case AArch64_MOVIv2i32:
    case AArch64_MOVIv4i32:
    case AArch64_MVNIv2i32:
    case AArch64_MVNIv4i32:
      MCOperand_CreateImm0(Inst, (cmode & 6) << 2);
      break;

    case AArch64_MOVIv2s_msl:
    case AArch64_MOVIv4s_msl:
    case AArch64_MVNIv2s_msl:
    case AArch64_MVNIv4s_msl:
      MCOperand_CreateImm0(Inst, cmode & 1 ? 0x110 : 0x108);
      break;
  }

  return Success;
}

static DecodeStatus DecodeModImmTiedInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  unsigned cmode = fieldFromInstruction_4(insn, 12, 4);
  unsigned imm = fieldFromInstruction_4(insn, 16, 3) << 5;
  imm |= fieldFromInstruction_4(insn, 5, 5);

  // Tied operands added twice.
  DecodeVectorRegisterClass(Inst, Rd, Addr, Decoder);
  DecodeVectorRegisterClass(Inst, Rd, Addr, Decoder);

  MCOperand_CreateImm0(Inst, imm);
  MCOperand_CreateImm0(Inst, (cmode & 6) << 2);

  return Success;
}

static DecodeStatus DecodeAdrInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  int64_t imm = fieldFromInstruction_4(insn, 5, 19) << 2;
  imm |= fieldFromInstruction_4(insn, 29, 2);

  // Sign-extend the 21-bit immediate.
  if (imm & (1 << (21 - 1)))
    imm |= ~((1LL << 21) - 1);

  DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
  //if (!Dis->tryAddingSymbolicOperand(Inst, imm, Addr, Fail, 0, 4))
  MCOperand_CreateImm0(Inst, imm);

  return Success;
}

static DecodeStatus DecodeAddSubImmShift(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder) 
{
  unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
  unsigned Rn = fieldFromInstruction_4(insn, 5, 5);
  unsigned Imm = fieldFromInstruction_4(insn, 10, 14);
  unsigned S = fieldFromInstruction_4(insn, 29, 1);
  unsigned Datasize = fieldFromInstruction_4(insn, 31, 1);

  unsigned ShifterVal = (Imm >> 12) & 3;
  unsigned ImmVal = Imm & 0xFFF;
  //   const AArch64Disassembler *Dis =
  //       static_cast<const AArch64Disassembler *>(Decoder);

  if (ShifterVal != 0 && ShifterVal != 1)
    return Fail;

  if (Datasize) {
    if (Rd == 31 && !S)
    DecodeGPR64spRegisterClass(Inst, Rd, Addr, Decoder);
    else
    DecodeGPR64RegisterClass(Inst, Rd, Addr, Decoder);
    DecodeGPR64spRegisterClass(Inst, Rn, Addr, Decoder);
  } else {
    if (Rd == 31 && !S)
    DecodeGPR32spRegisterClass(Inst, Rd, Addr, Decoder);
    else
    DecodeGPR32RegisterClass(Inst, Rd, Addr, Decoder);
    DecodeGPR32spRegisterClass(Inst, Rn, Addr, Decoder);
  }

  //   if (!Dis->tryAddingSymbolicOperand(Inst, Imm, Addr, Fail, 0, 4))
  MCOperand_CreateImm0(Inst, ImmVal);
  
  MCOperand_CreateImm0(Inst, (12 * ShifterVal));
  return Success;
}

static DecodeStatus DecodeUnconditionalBranch(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  int64_t imm = fieldFromInstruction_4(insn, 0, 26);

  // Sign-extend the 26-bit immediate.
  if (imm & (1 << (26 - 1)))
    imm |= ~((1LL << 26) - 1);

  // if (!Dis->tryAddingSymbolicOperand(Inst, imm << 2, Addr, true, 0, 4))
  MCOperand_CreateImm0(Inst, imm);

  return Success;
}

static DecodeStatus DecodeSystemPStateInstruction(MCInst *Inst,
    uint32_t insn, uint64_t Addr, const void *Decoder)
{
  uint32_t op1 = fieldFromInstruction_4(insn, 16, 3);
  uint32_t op2 = fieldFromInstruction_4(insn, 5, 3);
  uint32_t crm = fieldFromInstruction_4(insn, 8, 4);
  uint32_t pstate_field = (op1 << 3) | op2;

  if ((pstate_field == AArch64PState_PAN  ||
    pstate_field == AArch64PState_UAO) && crm > 1)
    return Fail;

  MCOperand_CreateImm0(Inst, pstate_field);
  MCOperand_CreateImm0(Inst, crm);

  if (lookupPStateByEncoding(pstate_field))
    return Success;

  return Fail;
}

static DecodeStatus DecodeTestAndBranch(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  uint32_t Rt = fieldFromInstruction_4(insn, 0, 5);
  uint32_t bit = fieldFromInstruction_4(insn, 31, 1) << 5;
  uint64_t dst = fieldFromInstruction_4(insn, 5, 14);

  bit |= fieldFromInstruction_4(insn, 19, 5);

  // Sign-extend 14-bit immediate.
  if (dst & (1 << (14 - 1)))
    dst |= ~((1LL << 14) - 1);

  if (fieldFromInstruction_4(insn, 31, 1) == 0)
    DecodeGPR32RegisterClass(Inst, Rt, Addr, Decoder);
  else
    DecodeGPR64RegisterClass(Inst, Rt, Addr, Decoder);

  MCOperand_CreateImm0(Inst, bit);

  //if (!Dis->tryAddingSymbolicOperand(Inst, dst << 2, Addr, true, 0, 4))
  MCOperand_CreateImm0(Inst, dst);

  return Success;
}

static DecodeStatus DecodeGPRSeqPairsClassRegisterClass(MCInst *Inst,
    unsigned RegClassID, unsigned RegNo, uint64_t Addr, const void *Decoder)
{
  unsigned Register;

  // Register number must be even (see CASP instruction)
  if (RegNo & 0x1)
    return Fail;

  Register = AArch64MCRegisterClasses[RegClassID].RegsBegin[RegNo / 2];
  MCOperand_CreateReg0(Inst, Register);

  return Success;
}

static DecodeStatus DecodeWSeqPairsClassRegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Addr, const void *Decoder)
{
  return DecodeGPRSeqPairsClassRegisterClass(Inst,
      AArch64_WSeqPairsClassRegClassID, RegNo, Addr, Decoder);
}

static DecodeStatus DecodeXSeqPairsClassRegisterClass(MCInst *Inst,
    unsigned RegNo, uint64_t Addr, const void *Decoder)
{
  return DecodeGPRSeqPairsClassRegisterClass(Inst,
      AArch64_XSeqPairsClassRegClassID, RegNo, Addr, Decoder);
}

static DecodeStatus DecodeSVELogicalImmInstruction(MCInst *Inst, uint32_t insn,
    uint64_t Addr, const void *Decoder)
{
  unsigned Zdn = fieldFromInstruction_4(insn, 0, 5);
  unsigned imm = fieldFromInstruction_4(insn, 5, 13);

  if (!AArch64_AM_isValidDecodeLogicalImmediate(imm, 64))
    return Fail;

  // The same (tied) operand is added twice to the instruction.
  DecodeZPRRegisterClass(Inst, Zdn, Addr, Decoder);
  if (MCInst_getOpcode(Inst) != AArch64_DUPM_ZI)
    DecodeZPRRegisterClass(Inst, Zdn, Addr, Decoder);

  MCOperand_CreateImm0(Inst, imm);

  return Success;
}

static DecodeStatus DecodeSImm(MCInst *Inst, uint64_t Imm, uint64_t Address,
    const void *Decoder, int Bits)
{
  if (Imm & ~((1LL << Bits) - 1))
    return Fail;

  // Imm is a signed immediate, so sign extend it.
  if (Imm & (1 << (Bits - 1)))
    Imm |= ~((1LL << Bits) - 1);

  MCOperand_CreateImm0(Inst, Imm);

  return Success;
}

// Decode 8-bit signed/unsigned immediate for a given element width.
static DecodeStatus DecodeImm8OptLsl(MCInst *Inst, unsigned Imm, uint64_t Addr,
    const void *Decoder, int ElementWidth)
{
  unsigned Val = (uint8_t)Imm;
  unsigned Shift = (Imm & 0x100) ? 8 : 0;

  if (ElementWidth == 8 && Shift)
    return Fail;

  MCOperand_CreateImm0(Inst, Val);
  MCOperand_CreateImm0(Inst, Shift);

  return Success;
}

// Decode uimm4 ranged from 1-16.
static DecodeStatus DecodeSVEIncDecImm(MCInst *Inst, unsigned Imm,
    uint64_t Addr, const void *Decoder)
{
  MCOperand_CreateImm0(Inst, Imm + 1);

  return Success;
}

static DecodeStatus DecodeSVCROp(MCInst *Inst, unsigned Imm, uint64_t Address,
        const void *Decoder) {
  if (lookupSVCRByEncoding(Imm)) {
    MCOperand_CreateImm0(Inst, Imm);
      return Success;
    }
    return Fail;
}

static DecodeStatus DecodeCPYMemOpInstruction(MCInst *Inst, uint32_t insn,
        uint64_t Addr, const void *Decoder) {
    unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
    unsigned Rs = fieldFromInstruction_4(insn, 16, 5);
    unsigned Rn = fieldFromInstruction_4(insn, 5, 5);

    // None of the registers may alias: if they do, then the instruction is not
    // merely unpredictable but actually entirely unallocated.
    if (Rd == Rs || Rs == Rn || Rd == Rn)
      return Fail;

    // All three register operands are written back, so they all appear
    // twice in the operand list, once as outputs and once as inputs.
    if (!DecodeGPR64commonRegisterClass(Inst, Rd, Addr, Decoder) ||
      !DecodeGPR64commonRegisterClass(Inst, Rs, Addr, Decoder) ||
        !DecodeGPR64RegisterClass(Inst, Rn, Addr, Decoder) ||
        !DecodeGPR64commonRegisterClass(Inst, Rd, Addr, Decoder) ||
        !DecodeGPR64commonRegisterClass(Inst, Rs, Addr, Decoder) ||
        !DecodeGPR64RegisterClass(Inst, Rn, Addr, Decoder))
      return Fail;

  return Success;
}

static DecodeStatus DecodeSETMemOpInstruction(MCInst *Inst, uint32_t insn,
        uint64_t Addr, const void *Decoder) {
    unsigned Rd = fieldFromInstruction_4(insn, 0, 5);
    unsigned Rm = fieldFromInstruction_4(insn, 16, 5);
    unsigned Rn = fieldFromInstruction_4(insn, 5, 5);

    // None of the registers may alias: if they do, then the instruction is not
    // merely unpredictable but actually entirely unallocated.
    if (Rd == Rm || Rm == Rn || Rd == Rn)
      return Fail;

    // Rd and Rn (not Rm) register operands are written back, so they appear
    // twice in the operand list, once as outputs and once as inputs.
    if (!DecodeGPR64commonRegisterClass(Inst, Rd, Addr, Decoder) ||
        !DecodeGPR64RegisterClass(Inst, Rn, Addr, Decoder) ||
        !DecodeGPR64commonRegisterClass(Inst, Rd, Addr, Decoder) ||
        !DecodeGPR64RegisterClass(Inst, Rn, Addr, Decoder) ||
        !DecodeGPR64RegisterClass(Inst, Rm, Addr, Decoder))
      return Fail;

    return Success;
}

void AArch64_init(MCRegisterInfo *MRI)
{
  /*
     InitMCRegisterInfo(AArch64RegDesc, 661,
        RA, PC,
      AArch64MCRegisterClasses, 100,
      AArch64RegUnitRoots, 115, AArch64RegDiffLists,
      AArch64LaneMaskLists, AArch64RegStrings, AArch64RegClassStrings,
      AArch64SubRegIdxLists, 100,
      AArch64SubRegIdxRanges, AArch64RegEncodingTable);
  */

  MCRegisterInfo_InitMCRegisterInfo(MRI, AArch64RegDesc, 674,
      0, 0,
      AArch64MCRegisterClasses, 202,
      0, 0, AArch64RegDiffLists,
      0,
      AArch64SubRegIdxLists, 100,
      0);
}

#endif

Coverage Report

Created: 2025-07-11 06:32