/src/capstonenext/arch/Xtensa/XtensaDisassembler.c

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/* 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 */

//===-- XtensaDisassembler.cpp - Disassembler for Xtensa ------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// 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 XtensaDisassembler class.
//
//===----------------------------------------------------------------------===//

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

#include "../../MathExtras.h"
#include "../../MCDisassembler.h"
#include "../../MCFixedLenDisassembler.h"
#include "../../SStream.h"
#include "../../cs_priv.h"
#include "../../utils.h"

#include "priv.h"

#define GET_INSTRINFO_MC_DESC
#include "XtensaGenInstrInfo.inc"

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

#define DEBUG_TYPE "Xtensa-disassembler"

static const unsigned ARDecoderTable[] = {
  Xtensa_A0,  Xtensa_SP,  Xtensa_A2,  Xtensa_A3, Xtensa_A4,  Xtensa_A5,
  Xtensa_A6,  Xtensa_A7,  Xtensa_A8,  Xtensa_A9, Xtensa_A10, Xtensa_A11,
  Xtensa_A12, Xtensa_A13, Xtensa_A14, Xtensa_A15
};

static const unsigned AE_DRDecoderTable[] = {
  Xtensa_AED0,  Xtensa_AED1,  Xtensa_AED2,  Xtensa_AED3,
  Xtensa_AED4,  Xtensa_AED5,  Xtensa_AED6,  Xtensa_AED7,
  Xtensa_AED8,  Xtensa_AED9,  Xtensa_AED10, Xtensa_AED11,
  Xtensa_AED12, Xtensa_AED13, Xtensa_AED14, Xtensa_AED15
};

static const unsigned AE_VALIGNDecoderTable[] = { Xtensa_U0, Xtensa_U1,
              Xtensa_U2, Xtensa_U3 };

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

  unsigned Reg = AE_DRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

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

  unsigned Reg = AE_VALIGNDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

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

  unsigned Reg = ARDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static const unsigned QRDecoderTable[] = { Xtensa_Q0, Xtensa_Q1, Xtensa_Q2,
             Xtensa_Q3, Xtensa_Q4, Xtensa_Q5,
             Xtensa_Q6, Xtensa_Q7 };

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

  unsigned Reg = QRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static const unsigned FPRDecoderTable[] = {
  Xtensa_F0,  Xtensa_F1,  Xtensa_F2,  Xtensa_F3, Xtensa_F4,  Xtensa_F5,
  Xtensa_F6,  Xtensa_F7,  Xtensa_F8,  Xtensa_F9, Xtensa_F10, Xtensa_F11,
  Xtensa_F12, Xtensa_F13, Xtensa_F14, Xtensa_F15
};

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

  unsigned Reg = FPRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static const unsigned BRDecoderTable[] = {
  Xtensa_B0,  Xtensa_B1,  Xtensa_B2,  Xtensa_B3, Xtensa_B4,  Xtensa_B5,
  Xtensa_B6,  Xtensa_B7,  Xtensa_B8,  Xtensa_B9, Xtensa_B10, Xtensa_B11,
  Xtensa_B12, Xtensa_B13, Xtensa_B14, Xtensa_B15
};

static const unsigned BR2DecoderTable[] = { Xtensa_B0_B1,   Xtensa_B2_B3,
              Xtensa_B4_B5,   Xtensa_B6_B7,
              Xtensa_B8_B9,   Xtensa_B10_B11,
              Xtensa_B12_B13, Xtensa_B14_B15 };

static const unsigned BR4DecoderTable[] = { Xtensa_B0_B1_B2_B3,
              Xtensa_B4_B5_B6_B7,
              Xtensa_B8_B9_B10_B11,
              Xtensa_B12_B13_B14_B15 };

static DecodeStatus DecodeXtensaRegisterClass(MCInst *Inst, uint64_t RegNo,
                uint64_t Address,
                const void *Decoder,
                const unsigned *DecoderTable,
                size_t DecoderTableLen)
{
  if (RegNo >= DecoderTableLen)
    return MCDisassembler_Fail;

  unsigned Reg = DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static DecodeStatus DecodeBR2RegisterClass(MCInst *Inst, uint64_t RegNo,
             uint64_t Address,
             const void *Decoder)
{
  return DecodeXtensaRegisterClass(Inst, RegNo, Address, Decoder,
           BR2DecoderTable,
           ARR_SIZE(BR2DecoderTable));
}

static DecodeStatus DecodeBR4RegisterClass(MCInst *Inst, uint64_t RegNo,
             uint64_t Address,
             const void *Decoder)
{
  return DecodeXtensaRegisterClass(Inst, RegNo, Address, Decoder,
           BR4DecoderTable,
           ARR_SIZE(BR4DecoderTable));
}

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

  unsigned Reg = BRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static const unsigned MRDecoderTable[] = { Xtensa_M0, Xtensa_M1, Xtensa_M2,
             Xtensa_M3 };

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

  unsigned Reg = MRDecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static const unsigned MR01DecoderTable[] = { Xtensa_M0, Xtensa_M1 };

static DecodeStatus DecodeMR01RegisterClass(MCInst *Inst, uint64_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= ARR_SIZE(MR01DecoderTable))
    return MCDisassembler_Fail;

  unsigned Reg = MR01DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

static const unsigned MR23DecoderTable[] = { Xtensa_M2, Xtensa_M3 };

static DecodeStatus DecodeMR23RegisterClass(MCInst *Inst, uint64_t RegNo,
              uint64_t Address,
              const void *Decoder)
{
  if (RegNo >= ARR_SIZE(MR23DecoderTable))
    return MCDisassembler_Fail;

  unsigned Reg = MR23DecoderTable[RegNo];
  MCOperand_CreateReg0(Inst, (Reg));
  return MCDisassembler_Success;
}

bool Xtensa_getFeatureBits(unsigned int mode, unsigned int feature)
{
  // we support everything
  return true;
}

// Verify SR and UR
bool CheckRegister(MCInst *Inst, unsigned RegNo)
{
  unsigned NumIntLevels = 0;
  unsigned NumTimers = 0;
  unsigned NumMiscSR = 0;
  bool IsESP32 = false;
  bool IsESP32S2 = false;
  bool Res = true;

  // Assume that CPU is esp32 by default
  if ((Inst->csh->mode & CS_MODE_XTENSA_ESP32)) {
    NumIntLevels = 6;
    NumTimers = 3;
    NumMiscSR = 4;
    IsESP32 = true;
  } else if (Inst->csh->mode & CS_MODE_XTENSA_ESP32S2) {
    NumIntLevels = 6;
    NumTimers = 3;
    NumMiscSR = 4;
    IsESP32S2 = true;
  } else if (Inst->csh->mode & CS_MODE_XTENSA_ESP8266) {
    NumIntLevels = 2;
    NumTimers = 1;
  }

  switch (RegNo) {
  case Xtensa_LBEG:
  case Xtensa_LEND:
  case Xtensa_LCOUNT:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureLoop);
    break;
  case Xtensa_BREG:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureBoolean);
    break;
  case Xtensa_LITBASE:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureExtendedL32R);
    break;
  case Xtensa_SCOMPARE1:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureS32C1I);
    break;
  case Xtensa_ACCLO:
  case Xtensa_ACCHI:
  case Xtensa_M0:
  case Xtensa_M1:
  case Xtensa_M2:
  case Xtensa_M3:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureMAC16);
    break;
  case Xtensa_WINDOWBASE:
  case Xtensa_WINDOWSTART:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureWindowed);
    break;
  case Xtensa_IBREAKENABLE:
  case Xtensa_IBREAKA0:
  case Xtensa_IBREAKA1:
  case Xtensa_DBREAKA0:
  case Xtensa_DBREAKA1:
  case Xtensa_DBREAKC0:
  case Xtensa_DBREAKC1:
  case Xtensa_DEBUGCAUSE:
  case Xtensa_ICOUNT:
  case Xtensa_ICOUNTLEVEL:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureDebug);
    break;
  case Xtensa_ATOMCTL:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureATOMCTL);
    break;
  case Xtensa_MEMCTL:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureMEMCTL);
    break;
  case Xtensa_EPC1:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureException);
    break;
  case Xtensa_EPC2:
  case Xtensa_EPC3:
  case Xtensa_EPC4:
  case Xtensa_EPC5:
  case Xtensa_EPC6:
  case Xtensa_EPC7:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureHighPriInterrupts);
    Res = Res & (NumIntLevels >= (RegNo - Xtensa_EPC1));
    break;
  case Xtensa_EPS2:
  case Xtensa_EPS3:
  case Xtensa_EPS4:
  case Xtensa_EPS5:
  case Xtensa_EPS6:
  case Xtensa_EPS7:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureHighPriInterrupts);
    Res = Res & (NumIntLevels > (RegNo - Xtensa_EPS2));
    break;
  case Xtensa_EXCSAVE1:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureException);
    break;
  case Xtensa_EXCSAVE2:
  case Xtensa_EXCSAVE3:
  case Xtensa_EXCSAVE4:
  case Xtensa_EXCSAVE5:
  case Xtensa_EXCSAVE6:
  case Xtensa_EXCSAVE7:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureHighPriInterrupts);
    Res = Res & (NumIntLevels >= (RegNo - Xtensa_EXCSAVE1));
    break;
  case Xtensa_DEPC:
  case Xtensa_EXCCAUSE:
  case Xtensa_EXCVADDR:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureException);
    break;
  case Xtensa_CPENABLE:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureCoprocessor);
    break;
  case Xtensa_VECBASE:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureRelocatableVector);
    break;
  case Xtensa_CCOUNT:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureTimerInt);
    Res &= (NumTimers > 0);
    break;
  case Xtensa_CCOMPARE0:
  case Xtensa_CCOMPARE1:
  case Xtensa_CCOMPARE2:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureTimerInt);
    Res &= (NumTimers > (RegNo - Xtensa_CCOMPARE0));
    break;
  case Xtensa_PRID:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeaturePRID);
    break;
  case Xtensa_INTERRUPT:
  case Xtensa_INTCLEAR:
  case Xtensa_INTENABLE:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureInterrupt);
    break;
  case Xtensa_MISC0:
  case Xtensa_MISC1:
  case Xtensa_MISC2:
  case Xtensa_MISC3:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureMiscSR);
    Res &= (NumMiscSR > (RegNo - Xtensa_MISC0));
    break;
  case Xtensa_THREADPTR:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureTHREADPTR);
    break;
  case Xtensa_GPIO_OUT:
    Res = IsESP32S2;
    break;
  case Xtensa_EXPSTATE:
    Res = IsESP32;
    break;
  case Xtensa_FCR:
  case Xtensa_FSR:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureSingleFloat);
    break;
  case Xtensa_F64R_LO:
  case Xtensa_F64R_HI:
  case Xtensa_F64S:
    Res = Xtensa_getFeatureBits(Inst->csh->mode,
              Xtensa_FeatureDFPAccel);
    break;
  }

  return Res;
}

static const unsigned SRDecoderTable[] = {
  Xtensa_LBEG,      0,   Xtensa_LEND,       1,
  Xtensa_LCOUNT,      2,   Xtensa_SAR,        3,
  Xtensa_BREG,      4,   Xtensa_LITBASE,      5,
  Xtensa_SCOMPARE1,   12,  Xtensa_ACCLO,        16,
  Xtensa_ACCHI,     17,  Xtensa_M0,       32,
  Xtensa_M1,      33,  Xtensa_M2,       34,
  Xtensa_M3,      35,  Xtensa_WINDOWBASE,   72,
  Xtensa_WINDOWSTART, 73,  Xtensa_IBREAKENABLE, 96,
  Xtensa_MEMCTL,      97,  Xtensa_ATOMCTL,      99,
  Xtensa_DDR,     104, Xtensa_IBREAKA0,     128,
  Xtensa_IBREAKA1,    129, Xtensa_DBREAKA0,     144,
  Xtensa_DBREAKA1,    145, Xtensa_DBREAKC0,     160,
  Xtensa_DBREAKC1,    161, Xtensa_CONFIGID0,    176,
  Xtensa_EPC1,      177, Xtensa_EPC2,       178,
  Xtensa_EPC3,      179, Xtensa_EPC4,       180,
  Xtensa_EPC5,      181, Xtensa_EPC6,       182,
  Xtensa_EPC7,      183, Xtensa_DEPC,       192,
  Xtensa_EPS2,      194, Xtensa_EPS3,       195,
  Xtensa_EPS4,      196, Xtensa_EPS5,       197,
  Xtensa_EPS6,      198, Xtensa_EPS7,       199,
  Xtensa_CONFIGID1,   208, Xtensa_EXCSAVE1,     209,
  Xtensa_EXCSAVE2,    210, Xtensa_EXCSAVE3,     211,
  Xtensa_EXCSAVE4,    212, Xtensa_EXCSAVE5,     213,
  Xtensa_EXCSAVE6,    214, Xtensa_EXCSAVE7,     215,
  Xtensa_CPENABLE,    224, Xtensa_INTERRUPT,    226,
  Xtensa_INTCLEAR,    227, Xtensa_INTENABLE,    228,
  Xtensa_PS,      230, Xtensa_VECBASE,      231,
  Xtensa_EXCCAUSE,    232, Xtensa_DEBUGCAUSE,   233,
  Xtensa_CCOUNT,      234, Xtensa_PRID,       235,
  Xtensa_ICOUNT,      236, Xtensa_ICOUNTLEVEL,  237,
  Xtensa_EXCVADDR,    238, Xtensa_CCOMPARE0,    240,
  Xtensa_CCOMPARE1,   241, Xtensa_CCOMPARE2,    242,
  Xtensa_MISC0,     244, Xtensa_MISC1,        245,
  Xtensa_MISC2,     246, Xtensa_MISC3,        247
};

static DecodeStatus DecodeSRRegisterClass(MCInst *Inst, uint64_t RegNo,
            uint64_t Address, const void *Decoder)
{
  //  const llvm_MCSubtargetInfo STI =
  //    ((const MCDisassembler *)Decoder)->getSubtargetInfo();

  if (RegNo > 255)
    return MCDisassembler_Fail;

  for (unsigned i = 0; i < ARR_SIZE(SRDecoderTable); i += 2) {
    if (SRDecoderTable[i + 1] == RegNo) {
      unsigned Reg = SRDecoderTable[i];

      if (!CheckRegister(Inst, Reg))
        return MCDisassembler_Fail;

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

  return MCDisassembler_Fail;
}

static const unsigned URDecoderTable[] = {
  Xtensa_GPIO_OUT, 0,   Xtensa_EXPSTATE, 230, Xtensa_THREADPTR, 231,
  Xtensa_FCR,  232, Xtensa_FSR,      233, Xtensa_F64R_LO,   234,
  Xtensa_F64R_HI,  235, Xtensa_F64S,     236
};

static DecodeStatus DecodeURRegisterClass(MCInst *Inst, uint64_t RegNo,
            uint64_t Address, const void *Decoder)
{
  if (RegNo > 255)
    return MCDisassembler_Fail;

  for (unsigned i = 0; i < ARR_SIZE(URDecoderTable); i += 2) {
    if (URDecoderTable[i + 1] == RegNo) {
      unsigned Reg = URDecoderTable[i];

      if (!CheckRegister(Inst, Reg))
        return MCDisassembler_Fail;

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

  return MCDisassembler_Fail;
}

static bool tryAddingSymbolicOperand(int64_t Value, bool isBranch,
             uint64_t Address, uint64_t Offset,
             uint64_t InstSize, MCInst *MI,
             const void *Decoder)
{
  //  return Dis->tryAddingSymbolicOperand(MI, Value, Address, isBranch,
  //               Offset, /*OpSize=*/0, InstSize);
  return false;
}

static DecodeStatus decodeCallOperand(MCInst *Inst, uint64_t Imm,
              int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(18, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (SignExtend64((Imm << 2), 20)));
  return MCDisassembler_Success;
}

static DecodeStatus decodeJumpOperand(MCInst *Inst, uint64_t Imm,
              int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(18, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (SignExtend64((Imm), 18)));
  return MCDisassembler_Success;
}

static DecodeStatus decodeBranchOperand(MCInst *Inst, uint64_t Imm,
          int64_t Address, const void *Decoder)
{
  switch (MCInst_getOpcode(Inst)) {
  case Xtensa_BEQZ:
  case Xtensa_BGEZ:
  case Xtensa_BLTZ:
  case Xtensa_BNEZ:
    CS_ASSERT(isUIntN(12, Imm) && "Invalid immediate");
    if (!tryAddingSymbolicOperand(
          SignExtend64((Imm), 12) + 4 + Address, true,
          Address, 0, 3, Inst, Decoder))
      MCOperand_CreateImm0(Inst, (SignExtend64((Imm), 12)));
    break;
  default:
    CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
    if (!tryAddingSymbolicOperand(
          SignExtend64((Imm), 8) + 4 + Address, true, Address,
          0, 3, Inst, Decoder))
      MCOperand_CreateImm0(Inst, (SignExtend64((Imm), 8)));
  }
  return MCDisassembler_Success;
}

static DecodeStatus decodeLoopOperand(MCInst *Inst, uint64_t Imm,
              int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  if (!tryAddingSymbolicOperand(Imm + 4 + Address, true, Address, 0, 3,
              Inst, Decoder))
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeL32ROperand(MCInst *Inst, uint64_t Imm,
              int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(16, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, OneExtend64(Imm << 2, 18));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm8Operand(MCInst *Inst, uint64_t Imm,
              int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (SignExtend64((Imm), 8)));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm8_sh8Operand(MCInst *Inst, uint64_t Imm,
            int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(16, Imm) && ((Imm & 0xff) == 0) &&
      "Invalid immediate");
  MCOperand_CreateImm0(Inst, (SignExtend64((Imm), 16)));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm12Operand(MCInst *Inst, uint64_t Imm,
               int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(12, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (SignExtend64((Imm), 12)));
  return MCDisassembler_Success;
}

static DecodeStatus decodeUimm4Operand(MCInst *Inst, uint64_t Imm,
               int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeUimm5Operand(MCInst *Inst, uint64_t Imm,
               int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(5, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm1_16Operand(MCInst *Inst, uint64_t Imm,
           int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm + 1));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm1n_15Operand(MCInst *Inst, uint64_t Imm,
            int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");
  if (!Imm)
    MCOperand_CreateImm0(Inst, (-1));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm32n_95Operand(MCInst *Inst, uint64_t Imm,
             int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(7, Imm) && "Invalid immediate");
  if ((Imm & 0x60) == 0x60)
    MCOperand_CreateImm0(Inst, ((~0x1f) | Imm));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm8n_7Operand(MCInst *Inst, uint64_t Imm,
           int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");
  if (Imm > 7)
    MCOperand_CreateImm0(Inst, (Imm - 16));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeImm64n_4nOperand(MCInst *Inst, uint64_t Imm,
             int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(6, Imm) && ((Imm & 0x3) == 0) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, ((~0x3f) | (Imm)));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset8m32Operand(MCInst *Inst, uint64_t Imm,
              int64_t Address,
              const void *Decoder)
{
  CS_ASSERT(isUIntN(10, Imm) && ((Imm & 0x3) == 0) &&
      "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeEntry_Imm12OpValue(MCInst *Inst, uint64_t Imm,
               int64_t Address,
               const void *Decoder)
{
  CS_ASSERT(isUIntN(15, Imm) && ((Imm & 0x7) == 0) &&
      "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeShimm1_31Operand(MCInst *Inst, uint64_t Imm,
             int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(5, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (32 - Imm));
  return MCDisassembler_Success;
}

//static DecodeStatus decodeShimm0_31Operand(MCInst *Inst, uint64_t Imm,
//             int64_t Address, const void *Decoder)
//{
//  CS_ASSERT(isUIntN(5, Imm) && "Invalid immediate");
//  MCOperand_CreateImm0(Inst, (32 - Imm));
//  return MCDisassembler_Success;
//}

static DecodeStatus decodeImm7_22Operand(MCInst *Inst, uint64_t Imm,
           int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm + 7));
  return MCDisassembler_Success;
}

static DecodeStatus decodeSelect_2Operand(MCInst *Inst, uint64_t Imm,
            int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeSelect_4Operand(MCInst *Inst, uint64_t Imm,
            int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeSelect_8Operand(MCInst *Inst, uint64_t Imm,
            int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeSelect_16Operand(MCInst *Inst, uint64_t Imm,
             int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeSelect_256Operand(MCInst *Inst, uint64_t Imm,
              int64_t Address,
              const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_16_16Operand(MCInst *Inst, uint64_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isIntN(Imm, 8) && "Invalid immediate");
  if ((Imm & 0xf) != 0)
    MCOperand_CreateImm0(Inst, (Imm << 4));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_256_8Operand(MCInst *Inst, uint64_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isIntN(16, Imm) && "Invalid immediate");
  if ((Imm & 0x7) != 0)
    MCOperand_CreateImm0(Inst, (Imm << 3));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_256_16Operand(MCInst *Inst, uint64_t Imm,
                 int64_t Address,
                 const void *Decoder)
{
  CS_ASSERT(isIntN(16, Imm) && "Invalid immediate");
  if ((Imm & 0xf) != 0)
    MCOperand_CreateImm0(Inst, (Imm << 4));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_256_4Operand(MCInst *Inst, uint64_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isIntN(16, Imm) && "Invalid immediate");
  if ((Imm & 0x2) != 0)
    MCOperand_CreateImm0(Inst, (Imm << 2));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_128_2Operand(MCInst *Inst, uint64_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  if ((Imm & 0x1) != 0)
    MCOperand_CreateImm0(Inst, (Imm << 1));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_128_1Operand(MCInst *Inst, uint64_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static DecodeStatus decodeOffset_64_16Operand(MCInst *Inst, uint64_t Imm,
                int64_t Address,
                const void *Decoder)
{
  CS_ASSERT(isIntN(16, Imm) && "Invalid immediate");
  if ((Imm & 0xf) != 0)
    MCOperand_CreateImm0(Inst, (Imm << 4));
  else
    MCOperand_CreateImm0(Inst, (Imm));
  return MCDisassembler_Success;
}

static int64_t TableB4const[16] = { -1, 1,  2,  3,  4,  5,  6,   7,
            8,  10, 12, 16, 32, 64, 128, 256 };
static DecodeStatus decodeB4constOperand(MCInst *Inst, uint64_t Imm,
           int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");

  MCOperand_CreateImm0(Inst, (TableB4const[Imm]));
  return MCDisassembler_Success;
}

static int64_t TableB4constu[16] = { 32768, 65536, 2,  3,  4,  5,  6, 7,
             8,     10,    12, 16, 32, 64, 128, 256 };
static DecodeStatus decodeB4constuOperand(MCInst *Inst, uint64_t Imm,
            int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(4, Imm) && "Invalid immediate");

  MCOperand_CreateImm0(Inst, (TableB4constu[Imm]));
  return MCDisassembler_Success;
}

static DecodeStatus decodeMem8Operand(MCInst *Inst, uint64_t Imm,
              int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(12, Imm) && "Invalid immediate");
  DecodeARRegisterClass(Inst, Imm & 0xf, Address, Decoder);
  MCOperand_CreateImm0(Inst, ((Imm >> 4) & 0xff));
  return MCDisassembler_Success;
}

static DecodeStatus decodeMem16Operand(MCInst *Inst, uint64_t Imm,
               int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(12, Imm) && "Invalid immediate");
  DecodeARRegisterClass(Inst, Imm & 0xf, Address, Decoder);
  MCOperand_CreateImm0(Inst, ((Imm >> 3) & 0x1fe));
  return MCDisassembler_Success;
}

static DecodeStatus decodeMem32Operand(MCInst *Inst, uint64_t Imm,
               int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(12, Imm) && "Invalid immediate");
  DecodeARRegisterClass(Inst, Imm & 0xf, Address, Decoder);
  MCOperand_CreateImm0(Inst, ((Imm >> 2) & 0x3fc));
  return MCDisassembler_Success;
}

static DecodeStatus decodeMem32nOperand(MCInst *Inst, uint64_t Imm,
          int64_t Address, const void *Decoder)
{
  CS_ASSERT(isUIntN(8, Imm) && "Invalid immediate");
  DecodeARRegisterClass(Inst, Imm & 0xf, Address, Decoder);
  MCOperand_CreateImm0(Inst, ((Imm >> 2) & 0x3c));
  return MCDisassembler_Success;
}

/// Read two bytes from the ArrayRef and return 16 bit data sorted
/// according to the given endianness.
static DecodeStatus readInstruction16(MCInst *MI, const uint8_t *Bytes,
              size_t BytesLen, uint64_t Address,
              uint64_t *Size, uint64_t *Insn,
              bool IsLittleEndian)
{
  // We want to read exactly 2 Bytes of data.
  if (BytesLen < 2) {
    *Size = 0;
    return MCDisassembler_Fail;
  }

  *Insn = readBytes16(MI, Bytes);
  *Size = 2;

  return MCDisassembler_Success;
}

/// Read three bytes from the ArrayRef and return 24 bit data
static DecodeStatus readInstruction24(MCInst *MI, const uint8_t *Bytes,
              size_t BytesLen, uint64_t Address,
              uint64_t *Size, uint64_t *Insn,
              bool IsLittleEndian, bool CheckTIE)
{
  // We want to read exactly 3 Bytes of data.
  if (BytesLen < 3) {
    *Size = 0;
    return MCDisassembler_Fail;
  }

  if (CheckTIE && (Bytes[0] & 0x8) != 0)
    return MCDisassembler_Fail;
  *Insn = readBytes24(MI, Bytes);
  *Size = 3;

  return MCDisassembler_Success;
}

/// Read three bytes from the ArrayRef and return 32 bit data
static DecodeStatus readInstruction32(MCInst *MI, const uint8_t *Bytes,
              size_t BytesLen, uint64_t Address,
              uint64_t *Size, uint64_t *Insn,
              bool IsLittleEndian)
{
  // We want to read exactly 4 Bytes of data.
  if (BytesLen < 4) {
    *Size = 0;
    return MCDisassembler_Fail;
  }

  if ((Bytes[0] & 0x8) == 0)
    return MCDisassembler_Fail;
  *Insn = readBytes32(MI, Bytes);
  *Size = 4;

  return MCDisassembler_Success;
}

/// Read InstSize bytes from the ArrayRef and return 24 bit data
static DecodeStatus readInstructionN(const uint8_t *Bytes, size_t BytesLen,
             uint64_t Address, unsigned InstSize,
             uint64_t *Size, uint64_t *Insn,
             bool IsLittleEndian)
{
  // We want to read exactly 3 Bytes of data.
  if (BytesLen < InstSize) {
    *Size = 0;
    return MCDisassembler_Fail;
  }

  *Insn = 0;
  for (unsigned i = 0; i < InstSize; i++)
    *Insn |= (uint64_t)(Bytes[i]) << (8 * i);

  *Size = InstSize;
  return MCDisassembler_Success;
}

#include "XtensaGenDisassemblerTables.inc"

FieldFromInstruction(fieldFromInstruction_2, uint64_t);
DecodeToMCInst(decodeToMCInst_2, fieldFromInstruction_2, uint64_t);
DecodeInstruction(decodeInstruction_2, fieldFromInstruction_2, decodeToMCInst_2,
      uint64_t);

FieldFromInstruction(fieldFromInstruction_4, uint64_t);
DecodeToMCInst(decodeToMCInst_4, fieldFromInstruction_4, uint64_t);
DecodeInstruction(decodeInstruction_4, fieldFromInstruction_4, decodeToMCInst_4,
      uint64_t);

FieldFromInstruction(fieldFromInstruction_6, uint64_t);
DecodeToMCInst(decodeToMCInst_6, fieldFromInstruction_6, uint64_t);
DecodeInstruction(decodeInstruction_6, fieldFromInstruction_6, decodeToMCInst_6,
      uint64_t);

static bool hasDensity()
{
  return true;
}
static bool hasESP32S3Ops()
{
  return true;
}
static bool hasHIFI3()
{
  return true;
}

static DecodeStatus getInstruction(MCInst *MI, uint64_t *Size,
           const uint8_t *Bytes, size_t BytesLen,
           uint64_t Address)
{
  uint64_t Insn;
  DecodeStatus Result;
  bool IsLittleEndian = MI->csh->mode & CS_MODE_LITTLE_ENDIAN;

  // Parse 16-bit instructions
  if (hasDensity()) {
    Result = readInstruction16(MI, Bytes, BytesLen, Address, Size,
             &Insn, IsLittleEndian);
    if (Result == MCDisassembler_Fail)
      return MCDisassembler_Fail;

    Result = decodeInstruction_2(DecoderTable16, MI, Insn, Address,
               NULL);
    if (Result != MCDisassembler_Fail) {
      *Size = 2;
      return Result;
    }
  }

  // Parse Core 24-bit instructions
  Result = readInstruction24(MI, Bytes, BytesLen, Address, Size, &Insn,
           IsLittleEndian, false);
  if (Result == MCDisassembler_Fail)
    return MCDisassembler_Fail;

  Result = decodeInstruction_3(DecoderTable24, MI, Insn, Address, NULL);
  if (Result != MCDisassembler_Fail) {
    *Size = 3;
    return Result;
  }

  if (hasESP32S3Ops()) {
    // Parse ESP32S3 24-bit instructions
    Result = readInstruction24(MI, Bytes, BytesLen, Address, Size,
             &Insn, IsLittleEndian, true);
    if (Result != MCDisassembler_Fail) {
      Result = decodeInstruction_3(DecoderTableESP32S324, MI,
                 Insn, Address, NULL);
      if (Result != MCDisassembler_Fail) {
        *Size = 3;
        return Result;
      }
    }

    // Parse ESP32S3 32-bit instructions
    Result = readInstruction32(MI, Bytes, BytesLen, Address, Size,
             &Insn, IsLittleEndian);
    if (Result == MCDisassembler_Fail)
      return MCDisassembler_Fail;

    Result = decodeInstruction_4(DecoderTableESP32S332, MI, Insn,
               Address, NULL);
    if (Result != MCDisassembler_Fail) {
      *Size = 4;
      return Result;
    }
  }

  if (hasHIFI3()) {
    Result = decodeInstruction_3(DecoderTableHIFI324, MI, Insn,
               Address, NULL);
    if (Result != MCDisassembler_Fail)
      return Result;

    Result = readInstructionN(Bytes, BytesLen, Address, 48, Size,
            &Insn, IsLittleEndian);
    if (Result == MCDisassembler_Fail)
      return MCDisassembler_Fail;

    Result = decodeInstruction_6(DecoderTableHIFI348, MI, Insn,
               Address, NULL);
    if (Result != MCDisassembler_Fail)
      return Result;
  }
  return Result;
}

DecodeStatus Xtensa_LLVM_getInstruction(MCInst *MI, uint16_t *size16,
          const uint8_t *Bytes,
          unsigned BytesSize, uint64_t Address)
{
  uint64_t size64;
  DecodeStatus status =
    getInstruction(MI, &size64, Bytes, BytesSize, Address);
  CS_ASSERT_RET_VAL(size64 < 0xffff, MCDisassembler_Fail);
  *size16 = size64;
  return status;
}

Coverage Report

Created: 2025-08-28 06:43