//===-- X86Disassembler.cpp - Disassembler for x86 and x86_64 -------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

//

// This file is part of the X86 Disassembler.

// It contains code to translate the data produced by the decoder into

//  MCInsts.

//

// The X86 disassembler is a table-driven disassembler for the 16-, 32-, and

// 64-bit X86 instruction sets.  The main decode sequence for an assembly

// instruction in this disassembler is:

//

// 1. Read the prefix bytes and determine the attributes of the instruction.

//    These attributes, recorded in enum attributeBits

//    (X86DisassemblerDecoderCommon.h), form a bitmask.  The table CONTEXTS_SYM

//    provides a mapping from bitmasks to contexts, which are represented by

//    enum InstructionContext (ibid.).

//

// 2. Read the opcode, and determine what kind of opcode it is.  The

//    disassembler distinguishes four kinds of opcodes, which are enumerated in

//    OpcodeType (X86DisassemblerDecoderCommon.h): one-byte (0xnn), two-byte

//    (0x0f 0xnn), three-byte-38 (0x0f 0x38 0xnn), or three-byte-3a

//    (0x0f 0x3a 0xnn).  Mandatory prefixes are treated as part of the context.

//

// 3. Depending on the opcode type, look in one of four ClassDecision structures

//    (X86DisassemblerDecoderCommon.h).  Use the opcode class to determine which

//    OpcodeDecision (ibid.) to look the opcode in.  Look up the opcode, to get

//    a ModRMDecision (ibid.).

//

// 4. Some instructions, such as escape opcodes or extended opcodes, or even

//    instructions that have ModRM*Reg / ModRM*Mem forms in LLVM, need the

//    ModR/M byte to complete decode.  The ModRMDecision's type is an entry from

//    ModRMDecisionType (X86DisassemblerDecoderCommon.h) that indicates if the

//    ModR/M byte is required and how to interpret it.

//

// 5. After resolving the ModRMDecision, the disassembler has a unique ID

//    of type InstrUID (X86DisassemblerDecoderCommon.h).  Looking this ID up in

//    INSTRUCTIONS_SYM yields the name of the instruction and the encodings and

//    meanings of its operands.

//

// 6. For each operand, its encoding is an entry from OperandEncoding

//    (X86DisassemblerDecoderCommon.h) and its type is an entry from

//    OperandType (ibid.).  The encoding indicates how to read it from the

//    instruction; the type indicates how to interpret the value once it has

//    been read.  For example, a register operand could be stored in the R/M

//    field of the ModR/M byte, the REG field of the ModR/M byte, or added to

//    the main opcode.  This is orthogonal from its meaning (an GPR or an XMM

//    register, for instance).  Given this information, the operands can be

//    extracted and interpreted.

//

// 7. As the last step, the disassembler translates the instruction information

//    and operands into a format understandable by the client - in this case, an

//    MCInst for use by the MC infrastructure.

//

// The disassembler is broken broadly into two parts: the table emitter that

// emits the instruction decode tables discussed above during compilation, and

// the disassembler itself.  The table emitter is documented in more detail in

// utils/TableGen/X86DisassemblerEmitter.h.

//

// X86Disassembler.cpp contains the code responsible for step 7, and for

//   invoking the decoder to execute steps 1-6.

// X86DisassemblerDecoderCommon.h contains the definitions needed by both the

//   table emitter and the disassembler.

// X86DisassemblerDecoder.h contains the public interface of the decoder,

//   factored out into C for possible use by other projects.

// X86DisassemblerDecoder.c contains the source code of the decoder, which is

//   responsible for steps 1-6.

//

//===----------------------------------------------------------------------===//

/* Capstone Disassembly Engine */

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

#ifdef CAPSTONE_HAS_X86

#if defined (WIN32) || defined (WIN64) || defined (_WIN32) || defined (_WIN64)

#pragma warning(disable:4996)     // disable MSVC's warning on strncpy()

#pragma warning(disable:28719)    // disable MSVC's warning on strncpy()

#endif

#include <capstone/platform.h>

#if defined(CAPSTONE_HAS_OSXKERNEL)

#include <Availability.h>

#endif

#include <string.h>

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

#include "X86BaseInfo.h"

#include "X86Disassembler.h"

#include "X86DisassemblerDecoderCommon.h"

#include "X86DisassemblerDecoder.h"

#include "../../MCInst.h"

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

#include "X86Mapping.h"

#define GET_REGINFO_ENUM

#define GET_REGINFO_MC_DESC

#include "X86GenRegisterInfo.inc"

#define GET_INSTRINFO_ENUM

#ifdef CAPSTONE_X86_REDUCE

#include "X86GenInstrInfo_reduce.inc"

#else

#include "X86GenInstrInfo.inc"

#endif

// Fill-ins to make the compiler happy.  These constants are never actually

//   assigned; they are just filler to make an automatically-generated switch

//   statement work.

enum {

  X86_BX_SI = 500,

  X86_BX_DI = 501,

  X86_BP_SI = 502,

  X86_BP_DI = 503,

  X86_sib   = 504,

  X86_sib64 = 505

};

//

// Private code that translates from struct InternalInstructions to MCInsts.

//

/// translateRegister - Translates an internal register to the appropriate LLVM

///   register, and appends it as an operand to an MCInst.

///

/// @param mcInst     - The MCInst to append to.

/// @param reg        - The Reg to append.

static void translateRegister(MCInst *mcInst, Reg reg)

{

#define ENTRY(x) X86_##x,

  static const uint16_t llvmRegnums[] = {

    ALL_REGS

    0

  };

#undef ENTRY

  uint16_t llvmRegnum = llvmRegnums[reg];

  MCOperand_CreateReg0(mcInst, llvmRegnum);

}

static const uint8_t segmentRegnums[SEG_OVERRIDE_max] = {

  0,        // SEG_OVERRIDE_NONE

  X86_CS,

  X86_SS,

  X86_DS,

  X86_ES,

  X86_FS,

  X86_GS

};

/// translateSrcIndex   - Appends a source index operand to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param insn         - The internal instruction.

static bool translateSrcIndex(MCInst *mcInst, InternalInstruction *insn)

{

  unsigned baseRegNo;

  if (insn->mode == MODE_64BIT)

    baseRegNo = insn->hasAdSize ? X86_ESI : X86_RSI;

  else if (insn->mode == MODE_32BIT)

    baseRegNo = insn->hasAdSize ? X86_SI : X86_ESI;

  else {

    // assert(insn->mode == MODE_16BIT);

    baseRegNo = insn->hasAdSize ? X86_ESI : X86_SI;

  }

  MCOperand_CreateReg0(mcInst, baseRegNo);

  MCOperand_CreateReg0(mcInst, segmentRegnums[insn->segmentOverride]);

  return false;

}

/// translateDstIndex   - Appends a destination index operand to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param insn         - The internal instruction.

static bool translateDstIndex(MCInst *mcInst, InternalInstruction *insn)

{

  unsigned baseRegNo;

  if (insn->mode == MODE_64BIT)

    baseRegNo = insn->hasAdSize ? X86_EDI : X86_RDI;

  else if (insn->mode == MODE_32BIT)

    baseRegNo = insn->hasAdSize ? X86_DI : X86_EDI;

  else {

    // assert(insn->mode == MODE_16BIT);

    baseRegNo = insn->hasAdSize ? X86_EDI : X86_DI;

  }

  MCOperand_CreateReg0(mcInst, baseRegNo);

  return false;

}

/// translateImmediate  - Appends an immediate operand to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param immediate    - The immediate value to append.

/// @param operand      - The operand, as stored in the descriptor table.

/// @param insn         - The internal instruction.

static void translateImmediate(MCInst *mcInst, uint64_t immediate,

    const OperandSpecifier *operand, InternalInstruction *insn)

{

  OperandType type;

  type = (OperandType)operand->type;

  if (type == TYPE_REL) {

    //isBranch = true;

    //pcrel = insn->startLocation + insn->immediateOffset + insn->immediateSize;

    switch (operand->encoding) {

      default:

        break;

      case ENCODING_Iv:

        switch (insn->displacementSize) {

          default:

            break;

          case 1:

            if(immediate & 0x80)

              immediate |= ~(0xffull);

            break;

          case 2:

            if(immediate & 0x8000)

              immediate |= ~(0xffffull);

            break;

          case 4:

            if(immediate & 0x80000000)

              immediate |= ~(0xffffffffull);

            break;

          case 8:

            break;

        }

        break;

      case ENCODING_IB:

        if (immediate & 0x80)

          immediate |= ~(0xffull);

        break;

      case ENCODING_IW:

        if (immediate & 0x8000)

          immediate |= ~(0xffffull);

        break;

      case ENCODING_ID:

        if (immediate & 0x80000000)

          immediate |= ~(0xffffffffull);

        break;

    }

  } // By default sign-extend all X86 immediates based on their encoding.

  else if (type == TYPE_IMM) {

    switch (operand->encoding) {

      default:

        break;

      case ENCODING_IB:

        if(immediate & 0x80)

          immediate |= ~(0xffull);

        break;

      case ENCODING_IW:

        if(immediate & 0x8000)

          immediate |= ~(0xffffull);

        break;

      case ENCODING_ID:

        if(immediate & 0x80000000)

          immediate |= ~(0xffffffffull);

        break;

      case ENCODING_IO:

        break;

    }

  } else if (type == TYPE_IMM3) {

#ifndef CAPSTONE_X86_REDUCE

    // Check for immediates that printSSECC can't handle.

    if (immediate >= 8) {

      unsigned NewOpc = 0;

      switch (MCInst_getOpcode(mcInst)) {

        default: break; // never reach

        case X86_CMPPDrmi:  NewOpc = X86_CMPPDrmi_alt;  break;

        case X86_CMPPDrri:  NewOpc = X86_CMPPDrri_alt;  break;

        case X86_CMPPSrmi:  NewOpc = X86_CMPPSrmi_alt;  break;

        case X86_CMPPSrri:  NewOpc = X86_CMPPSrri_alt;  break;

        case X86_CMPSDrm:   NewOpc = X86_CMPSDrm_alt;   break;

        case X86_CMPSDrr:   NewOpc = X86_CMPSDrr_alt;   break;

        case X86_CMPSSrm:   NewOpc = X86_CMPSSrm_alt;   break;

        case X86_CMPSSrr:   NewOpc = X86_CMPSSrr_alt;   break;

        case X86_VPCOMBri:  NewOpc = X86_VPCOMBri_alt;  break;

        case X86_VPCOMBmi:  NewOpc = X86_VPCOMBmi_alt;  break;

        case X86_VPCOMWri:  NewOpc = X86_VPCOMWri_alt;  break;

        case X86_VPCOMWmi:  NewOpc = X86_VPCOMWmi_alt;  break;

        case X86_VPCOMDri:  NewOpc = X86_VPCOMDri_alt;  break;

        case X86_VPCOMDmi:  NewOpc = X86_VPCOMDmi_alt;  break;

        case X86_VPCOMQri:  NewOpc = X86_VPCOMQri_alt;  break;

        case X86_VPCOMQmi:  NewOpc = X86_VPCOMQmi_alt;  break;

        case X86_VPCOMUBri: NewOpc = X86_VPCOMUBri_alt; break;

        case X86_VPCOMUBmi: NewOpc = X86_VPCOMUBmi_alt; break;

        case X86_VPCOMUWri: NewOpc = X86_VPCOMUWri_alt; break;

        case X86_VPCOMUWmi: NewOpc = X86_VPCOMUWmi_alt; break;

        case X86_VPCOMUDri: NewOpc = X86_VPCOMUDri_alt; break;

        case X86_VPCOMUDmi: NewOpc = X86_VPCOMUDmi_alt; break;

        case X86_VPCOMUQri: NewOpc = X86_VPCOMUQri_alt; break;

        case X86_VPCOMUQmi: NewOpc = X86_VPCOMUQmi_alt; break;

      }

      // Switch opcode to the one that doesn't get special printing.

      if (NewOpc != 0) {

        MCInst_setOpcode(mcInst, NewOpc);

      }

    }

#endif

  } else if (type == TYPE_IMM5) {

#ifndef CAPSTONE_X86_REDUCE

    // Check for immediates that printAVXCC can't handle.

    if (immediate >= 32) {

      unsigned NewOpc = 0;

      switch (MCInst_getOpcode(mcInst)) {

        default: break; // unexpected opcode

        case X86_VCMPPDrmi:   NewOpc = X86_VCMPPDrmi_alt;   break;

        case X86_VCMPPDrri:   NewOpc = X86_VCMPPDrri_alt;   break;

        case X86_VCMPPSrmi:   NewOpc = X86_VCMPPSrmi_alt;   break;

        case X86_VCMPPSrri:   NewOpc = X86_VCMPPSrri_alt;   break;

        case X86_VCMPSDrm:    NewOpc = X86_VCMPSDrm_alt;    break;

        case X86_VCMPSDrr:    NewOpc = X86_VCMPSDrr_alt;    break;

        case X86_VCMPSSrm:    NewOpc = X86_VCMPSSrm_alt;    break;

        case X86_VCMPSSrr:    NewOpc = X86_VCMPSSrr_alt;    break;

        case X86_VCMPPDYrmi:  NewOpc = X86_VCMPPDYrmi_alt;  break;

        case X86_VCMPPDYrri:  NewOpc = X86_VCMPPDYrri_alt;  break;

        case X86_VCMPPSYrmi:  NewOpc = X86_VCMPPSYrmi_alt;  break;

        case X86_VCMPPSYrri:  NewOpc = X86_VCMPPSYrri_alt;  break;

        case X86_VCMPPDZrmi:  NewOpc = X86_VCMPPDZrmi_alt;  break;

        case X86_VCMPPDZrri:  NewOpc = X86_VCMPPDZrri_alt;  break;

        case X86_VCMPPDZrrib: NewOpc = X86_VCMPPDZrrib_alt; break;

        case X86_VCMPPSZrmi:  NewOpc = X86_VCMPPSZrmi_alt;  break;

        case X86_VCMPPSZrri:  NewOpc = X86_VCMPPSZrri_alt;  break;

        case X86_VCMPPSZrrib: NewOpc = X86_VCMPPSZrrib_alt; break;

        case X86_VCMPPDZ128rmi:  NewOpc = X86_VCMPPDZ128rmi_alt;  break;

        case X86_VCMPPDZ128rri:  NewOpc = X86_VCMPPDZ128rri_alt;  break;

        case X86_VCMPPSZ128rmi:  NewOpc = X86_VCMPPSZ128rmi_alt;  break;

        case X86_VCMPPSZ128rri:  NewOpc = X86_VCMPPSZ128rri_alt;  break;

        case X86_VCMPPDZ256rmi:  NewOpc = X86_VCMPPDZ256rmi_alt;  break;

        case X86_VCMPPDZ256rri:  NewOpc = X86_VCMPPDZ256rri_alt;  break;

        case X86_VCMPPSZ256rmi:  NewOpc = X86_VCMPPSZ256rmi_alt;  break;

        case X86_VCMPPSZ256rri:  NewOpc = X86_VCMPPSZ256rri_alt;  break;

        case X86_VCMPSDZrm_Int:  NewOpc = X86_VCMPSDZrmi_alt;  break;

        case X86_VCMPSDZrr_Int:  NewOpc = X86_VCMPSDZrri_alt;  break;

        case X86_VCMPSDZrrb_Int: NewOpc = X86_VCMPSDZrrb_alt;  break;

        case X86_VCMPSSZrm_Int:  NewOpc = X86_VCMPSSZrmi_alt;  break;

        case X86_VCMPSSZrr_Int:  NewOpc = X86_VCMPSSZrri_alt;  break;

        case X86_VCMPSSZrrb_Int: NewOpc = X86_VCMPSSZrrb_alt;  break;

      }

      // Switch opcode to the one that doesn't get special printing.

      if (NewOpc != 0) {

        MCInst_setOpcode(mcInst, NewOpc);

      }

    }

#endif

  } else if (type == TYPE_AVX512ICC) {

#ifndef CAPSTONE_X86_REDUCE

    if (immediate >= 8 || ((immediate & 0x3) == 3)) {

      unsigned NewOpc = 0;

      switch (MCInst_getOpcode(mcInst)) {

        default: // llvm_unreachable("unexpected opcode");

        case X86_VPCMPBZ128rmi:    NewOpc = X86_VPCMPBZ128rmi_alt;    break;

        case X86_VPCMPBZ128rmik:   NewOpc = X86_VPCMPBZ128rmik_alt;   break;

        case X86_VPCMPBZ128rri:    NewOpc = X86_VPCMPBZ128rri_alt;    break;

        case X86_VPCMPBZ128rrik:   NewOpc = X86_VPCMPBZ128rrik_alt;   break;

        case X86_VPCMPBZ256rmi:    NewOpc = X86_VPCMPBZ256rmi_alt;    break;

        case X86_VPCMPBZ256rmik:   NewOpc = X86_VPCMPBZ256rmik_alt;   break;

        case X86_VPCMPBZ256rri:    NewOpc = X86_VPCMPBZ256rri_alt;    break;

        case X86_VPCMPBZ256rrik:   NewOpc = X86_VPCMPBZ256rrik_alt;   break;

        case X86_VPCMPBZrmi:       NewOpc = X86_VPCMPBZrmi_alt;       break;

        case X86_VPCMPBZrmik:      NewOpc = X86_VPCMPBZrmik_alt;      break;

        case X86_VPCMPBZrri:       NewOpc = X86_VPCMPBZrri_alt;       break;

        case X86_VPCMPBZrrik:      NewOpc = X86_VPCMPBZrrik_alt;      break;

        case X86_VPCMPDZ128rmi:    NewOpc = X86_VPCMPDZ128rmi_alt;    break;

        case X86_VPCMPDZ128rmib:   NewOpc = X86_VPCMPDZ128rmib_alt;   break;

        case X86_VPCMPDZ128rmibk:  NewOpc = X86_VPCMPDZ128rmibk_alt;  break;

        case X86_VPCMPDZ128rmik:   NewOpc = X86_VPCMPDZ128rmik_alt;   break;

        case X86_VPCMPDZ128rri:    NewOpc = X86_VPCMPDZ128rri_alt;    break;

        case X86_VPCMPDZ128rrik:   NewOpc = X86_VPCMPDZ128rrik_alt;   break;

        case X86_VPCMPDZ256rmi:    NewOpc = X86_VPCMPDZ256rmi_alt;    break;

        case X86_VPCMPDZ256rmib:   NewOpc = X86_VPCMPDZ256rmib_alt;   break;

        case X86_VPCMPDZ256rmibk:  NewOpc = X86_VPCMPDZ256rmibk_alt;  break;

        case X86_VPCMPDZ256rmik:   NewOpc = X86_VPCMPDZ256rmik_alt;   break;

        case X86_VPCMPDZ256rri:    NewOpc = X86_VPCMPDZ256rri_alt;    break;

        case X86_VPCMPDZ256rrik:   NewOpc = X86_VPCMPDZ256rrik_alt;   break;

        case X86_VPCMPDZrmi:       NewOpc = X86_VPCMPDZrmi_alt;       break;

        case X86_VPCMPDZrmib:      NewOpc = X86_VPCMPDZrmib_alt;      break;

        case X86_VPCMPDZrmibk:     NewOpc = X86_VPCMPDZrmibk_alt;     break;

        case X86_VPCMPDZrmik:      NewOpc = X86_VPCMPDZrmik_alt;      break;

        case X86_VPCMPDZrri:       NewOpc = X86_VPCMPDZrri_alt;       break;

        case X86_VPCMPDZrrik:      NewOpc = X86_VPCMPDZrrik_alt;      break;

        case X86_VPCMPQZ128rmi:    NewOpc = X86_VPCMPQZ128rmi_alt;    break;

        case X86_VPCMPQZ128rmib:   NewOpc = X86_VPCMPQZ128rmib_alt;   break;

        case X86_VPCMPQZ128rmibk:  NewOpc = X86_VPCMPQZ128rmibk_alt;  break;

        case X86_VPCMPQZ128rmik:   NewOpc = X86_VPCMPQZ128rmik_alt;   break;

        case X86_VPCMPQZ128rri:    NewOpc = X86_VPCMPQZ128rri_alt;    break;

        case X86_VPCMPQZ128rrik:   NewOpc = X86_VPCMPQZ128rrik_alt;   break;

        case X86_VPCMPQZ256rmi:    NewOpc = X86_VPCMPQZ256rmi_alt;    break;

        case X86_VPCMPQZ256rmib:   NewOpc = X86_VPCMPQZ256rmib_alt;   break;

        case X86_VPCMPQZ256rmibk:  NewOpc = X86_VPCMPQZ256rmibk_alt;  break;

        case X86_VPCMPQZ256rmik:   NewOpc = X86_VPCMPQZ256rmik_alt;   break;

        case X86_VPCMPQZ256rri:    NewOpc = X86_VPCMPQZ256rri_alt;    break;

        case X86_VPCMPQZ256rrik:   NewOpc = X86_VPCMPQZ256rrik_alt;   break;

        case X86_VPCMPQZrmi:       NewOpc = X86_VPCMPQZrmi_alt;       break;

        case X86_VPCMPQZrmib:      NewOpc = X86_VPCMPQZrmib_alt;      break;

        case X86_VPCMPQZrmibk:     NewOpc = X86_VPCMPQZrmibk_alt;     break;

        case X86_VPCMPQZrmik:      NewOpc = X86_VPCMPQZrmik_alt;      break;

        case X86_VPCMPQZrri:       NewOpc = X86_VPCMPQZrri_alt;       break;

        case X86_VPCMPQZrrik:      NewOpc = X86_VPCMPQZrrik_alt;      break;

        case X86_VPCMPUBZ128rmi:   NewOpc = X86_VPCMPUBZ128rmi_alt;   break;

        case X86_VPCMPUBZ128rmik:  NewOpc = X86_VPCMPUBZ128rmik_alt;  break;

        case X86_VPCMPUBZ128rri:   NewOpc = X86_VPCMPUBZ128rri_alt;   break;

        case X86_VPCMPUBZ128rrik:  NewOpc = X86_VPCMPUBZ128rrik_alt;  break;

        case X86_VPCMPUBZ256rmi:   NewOpc = X86_VPCMPUBZ256rmi_alt;   break;

        case X86_VPCMPUBZ256rmik:  NewOpc = X86_VPCMPUBZ256rmik_alt;  break;

        case X86_VPCMPUBZ256rri:   NewOpc = X86_VPCMPUBZ256rri_alt;   break;

        case X86_VPCMPUBZ256rrik:  NewOpc = X86_VPCMPUBZ256rrik_alt;  break;

        case X86_VPCMPUBZrmi:      NewOpc = X86_VPCMPUBZrmi_alt;      break;

        case X86_VPCMPUBZrmik:     NewOpc = X86_VPCMPUBZrmik_alt;     break;

        case X86_VPCMPUBZrri:      NewOpc = X86_VPCMPUBZrri_alt;      break;

        case X86_VPCMPUBZrrik:     NewOpc = X86_VPCMPUBZrrik_alt;     break;

        case X86_VPCMPUDZ128rmi:   NewOpc = X86_VPCMPUDZ128rmi_alt;   break;

        case X86_VPCMPUDZ128rmib:  NewOpc = X86_VPCMPUDZ128rmib_alt;  break;

        case X86_VPCMPUDZ128rmibk: NewOpc = X86_VPCMPUDZ128rmibk_alt; break;

        case X86_VPCMPUDZ128rmik:  NewOpc = X86_VPCMPUDZ128rmik_alt;  break;

        case X86_VPCMPUDZ128rri:   NewOpc = X86_VPCMPUDZ128rri_alt;   break;

        case X86_VPCMPUDZ128rrik:  NewOpc = X86_VPCMPUDZ128rrik_alt;  break;

        case X86_VPCMPUDZ256rmi:   NewOpc = X86_VPCMPUDZ256rmi_alt;   break;

        case X86_VPCMPUDZ256rmib:  NewOpc = X86_VPCMPUDZ256rmib_alt;  break;

        case X86_VPCMPUDZ256rmibk: NewOpc = X86_VPCMPUDZ256rmibk_alt; break;

        case X86_VPCMPUDZ256rmik:  NewOpc = X86_VPCMPUDZ256rmik_alt;  break;

        case X86_VPCMPUDZ256rri:   NewOpc = X86_VPCMPUDZ256rri_alt;   break;

        case X86_VPCMPUDZ256rrik:  NewOpc = X86_VPCMPUDZ256rrik_alt;  break;

        case X86_VPCMPUDZrmi:      NewOpc = X86_VPCMPUDZrmi_alt;      break;

        case X86_VPCMPUDZrmib:     NewOpc = X86_VPCMPUDZrmib_alt;     break;

        case X86_VPCMPUDZrmibk:    NewOpc = X86_VPCMPUDZrmibk_alt;    break;

        case X86_VPCMPUDZrmik:     NewOpc = X86_VPCMPUDZrmik_alt;     break;

        case X86_VPCMPUDZrri:      NewOpc = X86_VPCMPUDZrri_alt;      break;

        case X86_VPCMPUDZrrik:     NewOpc = X86_VPCMPUDZrrik_alt;     break;

        case X86_VPCMPUQZ128rmi:   NewOpc = X86_VPCMPUQZ128rmi_alt;   break;

        case X86_VPCMPUQZ128rmib:  NewOpc = X86_VPCMPUQZ128rmib_alt;  break;

        case X86_VPCMPUQZ128rmibk: NewOpc = X86_VPCMPUQZ128rmibk_alt; break;

        case X86_VPCMPUQZ128rmik:  NewOpc = X86_VPCMPUQZ128rmik_alt;  break;

        case X86_VPCMPUQZ128rri:   NewOpc = X86_VPCMPUQZ128rri_alt;   break;

        case X86_VPCMPUQZ128rrik:  NewOpc = X86_VPCMPUQZ128rrik_alt;  break;

        case X86_VPCMPUQZ256rmi:   NewOpc = X86_VPCMPUQZ256rmi_alt;   break;

        case X86_VPCMPUQZ256rmib:  NewOpc = X86_VPCMPUQZ256rmib_alt;  break;

        case X86_VPCMPUQZ256rmibk: NewOpc = X86_VPCMPUQZ256rmibk_alt; break;

        case X86_VPCMPUQZ256rmik:  NewOpc = X86_VPCMPUQZ256rmik_alt;  break;

        case X86_VPCMPUQZ256rri:   NewOpc = X86_VPCMPUQZ256rri_alt;   break;

        case X86_VPCMPUQZ256rrik:  NewOpc = X86_VPCMPUQZ256rrik_alt;  break;

        case X86_VPCMPUQZrmi:      NewOpc = X86_VPCMPUQZrmi_alt;      break;

        case X86_VPCMPUQZrmib:     NewOpc = X86_VPCMPUQZrmib_alt;     break;

        case X86_VPCMPUQZrmibk:    NewOpc = X86_VPCMPUQZrmibk_alt;    break;

        case X86_VPCMPUQZrmik:     NewOpc = X86_VPCMPUQZrmik_alt;     break;

        case X86_VPCMPUQZrri:      NewOpc = X86_VPCMPUQZrri_alt;      break;

        case X86_VPCMPUQZrrik:     NewOpc = X86_VPCMPUQZrrik_alt;     break;

        case X86_VPCMPUWZ128rmi:   NewOpc = X86_VPCMPUWZ128rmi_alt;   break;

        case X86_VPCMPUWZ128rmik:  NewOpc = X86_VPCMPUWZ128rmik_alt;  break;

        case X86_VPCMPUWZ128rri:   NewOpc = X86_VPCMPUWZ128rri_alt;   break;

        case X86_VPCMPUWZ128rrik:  NewOpc = X86_VPCMPUWZ128rrik_alt;  break;

        case X86_VPCMPUWZ256rmi:   NewOpc = X86_VPCMPUWZ256rmi_alt;   break;

        case X86_VPCMPUWZ256rmik:  NewOpc = X86_VPCMPUWZ256rmik_alt;  break;

        case X86_VPCMPUWZ256rri:   NewOpc = X86_VPCMPUWZ256rri_alt;   break;

        case X86_VPCMPUWZ256rrik:  NewOpc = X86_VPCMPUWZ256rrik_alt;  break;

        case X86_VPCMPUWZrmi:      NewOpc = X86_VPCMPUWZrmi_alt;      break;

        case X86_VPCMPUWZrmik:     NewOpc = X86_VPCMPUWZrmik_alt;     break;

        case X86_VPCMPUWZrri:      NewOpc = X86_VPCMPUWZrri_alt;      break;

        case X86_VPCMPUWZrrik:     NewOpc = X86_VPCMPUWZrrik_alt;     break;

        case X86_VPCMPWZ128rmi:    NewOpc = X86_VPCMPWZ128rmi_alt;    break;

        case X86_VPCMPWZ128rmik:   NewOpc = X86_VPCMPWZ128rmik_alt;   break;

        case X86_VPCMPWZ128rri:    NewOpc = X86_VPCMPWZ128rri_alt;    break;

        case X86_VPCMPWZ128rrik:   NewOpc = X86_VPCMPWZ128rrik_alt;   break;

        case X86_VPCMPWZ256rmi:    NewOpc = X86_VPCMPWZ256rmi_alt;    break;

        case X86_VPCMPWZ256rmik:   NewOpc = X86_VPCMPWZ256rmik_alt;   break;

        case X86_VPCMPWZ256rri:    NewOpc = X86_VPCMPWZ256rri_alt;    break;

        case X86_VPCMPWZ256rrik:   NewOpc = X86_VPCMPWZ256rrik_alt;   break;

        case X86_VPCMPWZrmi:       NewOpc = X86_VPCMPWZrmi_alt;       break;

        case X86_VPCMPWZrmik:      NewOpc = X86_VPCMPWZrmik_alt;      break;

        case X86_VPCMPWZrri:       NewOpc = X86_VPCMPWZrri_alt;       break;

        case X86_VPCMPWZrrik:      NewOpc = X86_VPCMPWZrrik_alt;      break;

      }

      // Switch opcode to the one that doesn't get special printing.

      if (NewOpc != 0) {

        MCInst_setOpcode(mcInst, NewOpc);

      }

    }

#endif

  }

  switch (type) {

    case TYPE_XMM:

      MCOperand_CreateReg0(mcInst, X86_XMM0 + ((uint32_t)immediate >> 4));

      return;

    case TYPE_YMM:

      MCOperand_CreateReg0(mcInst, X86_YMM0 + ((uint32_t)immediate >> 4));

      return;

    case TYPE_ZMM:

      MCOperand_CreateReg0(mcInst, X86_ZMM0 + ((uint32_t)immediate >> 4));

      return;

    default:

      // operand is 64 bits wide.  Do nothing.

      break;

  }

  MCOperand_CreateImm0(mcInst, immediate);

  if (type == TYPE_MOFFS) {

    MCOperand_CreateReg0(mcInst, segmentRegnums[insn->segmentOverride]);

  }

}

/// translateRMRegister - Translates a register stored in the R/M field of the

///   ModR/M byte to its LLVM equivalent and appends it to an MCInst.

/// @param mcInst       - The MCInst to append to.

/// @param insn         - The internal instruction to extract the R/M field

///                       from.

/// @return             - 0 on success; -1 otherwise

static bool translateRMRegister(MCInst *mcInst, InternalInstruction *insn)

{

  if (insn->eaBase == EA_BASE_sib || insn->eaBase == EA_BASE_sib64) {

    //debug("A R/M register operand may not have a SIB byte");

    return true;

  }

  switch (insn->eaBase) {

    case EA_BASE_NONE:

      //debug("EA_BASE_NONE for ModR/M base");

      return true;

#define ENTRY(x) case EA_BASE_##x:

      ALL_EA_BASES

#undef ENTRY

        //debug("A R/M register operand may not have a base; "

        //      "the operand must be a register.");

        return true;

#define ENTRY(x)                                                      \

    case EA_REG_##x:                                                    \

      MCOperand_CreateReg0(mcInst, X86_##x); break;

      ALL_REGS

#undef ENTRY

    default:

        //debug("Unexpected EA base register");

        return true;

  }

  return false;

}

/// translateRMMemory - Translates a memory operand stored in the Mod and R/M

///   fields of an internal instruction (and possibly its SIB byte) to a memory

///   operand in LLVM's format, and appends it to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param insn         - The instruction to extract Mod, R/M, and SIB fields

///                       from.

/// @return             - 0 on success; nonzero otherwise

static bool translateRMMemory(MCInst *mcInst, InternalInstruction *insn)

{

  // Addresses in an MCInst are represented as five operands:

  //   1. basereg       (register)  The R/M base, or (if there is a SIB) the

  //                                SIB base

  //   2. scaleamount   (immediate) 1, or (if there is a SIB) the specified

  //                                scale amount

  //   3. indexreg      (register)  x86_registerNONE, or (if there is a SIB)

  //                                the index (which is multiplied by the

  //                                scale amount)

  //   4. displacement  (immediate) 0, or the displacement if there is one

  //   5. segmentreg    (register)  x86_registerNONE for now, but could be set

  //                                if we have segment overrides

  int scaleAmount, indexReg;

  if (insn->eaBase == EA_BASE_sib || insn->eaBase == EA_BASE_sib64) {

    if (insn->sibBase != SIB_BASE_NONE) {

      switch (insn->sibBase) {

#define ENTRY(x)                                          \

        case SIB_BASE_##x:                                  \

        MCOperand_CreateReg0(mcInst, X86_##x); break;

        ALL_SIB_BASES

#undef ENTRY

        default:

          //debug("Unexpected sibBase");

          return true;

      }

    } else {

      MCOperand_CreateReg0(mcInst, 0);

    }

    if (insn->sibIndex != SIB_INDEX_NONE) {

      switch (insn->sibIndex) {

        default:

          //debug("Unexpected sibIndex");

          return true;

#define ENTRY(x)                                          \

        case SIB_INDEX_##x:                                 \

          indexReg = X86_##x; break;

          EA_BASES_32BIT

            EA_BASES_64BIT

            REGS_XMM

            REGS_YMM

            REGS_ZMM

#undef ENTRY

      }

    } else {

      // Use EIZ/RIZ for a few ambiguous cases where the SIB byte is present,

      // but no index is used and modrm alone should have been enough.

      // -No base register in 32-bit mode. In 64-bit mode this is used to

      //  avoid rip-relative addressing.

      // -Any base register used other than ESP/RSP/R12D/R12. Using these as a

      //  base always requires a SIB byte.

      // -A scale other than 1 is used.

      if (insn->sibScale != 1 ||

          (insn->sibBase == SIB_BASE_NONE && insn->mode != MODE_64BIT) ||

          (insn->sibBase != SIB_BASE_NONE &&

           insn->sibBase != SIB_BASE_ESP && insn->sibBase != SIB_BASE_RSP &&

           insn->sibBase != SIB_BASE_R12D && insn->sibBase != SIB_BASE_R12)) {

        indexReg = insn->addressSize == 4? X86_EIZ : X86_RIZ;

      } else

        indexReg = 0;

    }

    scaleAmount = insn->sibScale;

  } else {

    switch (insn->eaBase) {

      case EA_BASE_NONE:

        if (insn->eaDisplacement == EA_DISP_NONE) {

          //debug("EA_BASE_NONE and EA_DISP_NONE for ModR/M base");

          return true;

        }

        if (insn->mode == MODE_64BIT) {

          if (insn->prefix3 == 0x67)  // address-size prefix overrides RIP relative addressing

            MCOperand_CreateReg0(mcInst, X86_EIP);

          else

            // Section 2.2.1.6

            MCOperand_CreateReg0(mcInst, insn->addressSize == 4 ? X86_EIP : X86_RIP);

        } else {

          MCOperand_CreateReg0(mcInst, 0);

        }

        indexReg = 0;

        break;

      case EA_BASE_BX_SI:

        MCOperand_CreateReg0(mcInst, X86_BX);

        indexReg = X86_SI;

        break;

      case EA_BASE_BX_DI:

        MCOperand_CreateReg0(mcInst, X86_BX);

        indexReg = X86_DI;

        break;

      case EA_BASE_BP_SI:

        MCOperand_CreateReg0(mcInst, X86_BP);

        indexReg = X86_SI;

        break;

      case EA_BASE_BP_DI:

        MCOperand_CreateReg0(mcInst, X86_BP);

        indexReg = X86_DI;

        break;

      default:

        indexReg = 0;

        switch (insn->eaBase) {

          default:

            //debug("Unexpected eaBase");

            return true;

            // Here, we will use the fill-ins defined above.  However,

            //   BX_SI, BX_DI, BP_SI, and BP_DI are all handled above and

            //   sib and sib64 were handled in the top-level if, so they're only

            //   placeholders to keep the compiler happy.

#define ENTRY(x)                                        \

          case EA_BASE_##x:                                 \

              MCOperand_CreateReg0(mcInst, X86_##x); break;

            ALL_EA_BASES

#undef ENTRY

#define ENTRY(x) case EA_REG_##x:

              ALL_REGS

#undef ENTRY

              //debug("A R/M memory operand may not be a register; "

              //      "the base field must be a base.");

              return true;

        }

    }

    scaleAmount = 1;

  }

  MCOperand_CreateImm0(mcInst, scaleAmount);

  MCOperand_CreateReg0(mcInst, indexReg);

  MCOperand_CreateImm0(mcInst, insn->displacement);

  MCOperand_CreateReg0(mcInst, segmentRegnums[insn->segmentOverride]);

  return false;

}

/// translateRM - Translates an operand stored in the R/M (and possibly SIB)

///   byte of an instruction to LLVM form, and appends it to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param operand      - The operand, as stored in the descriptor table.

/// @param insn         - The instruction to extract Mod, R/M, and SIB fields

///                       from.

/// @return             - 0 on success; nonzero otherwise

static bool translateRM(MCInst *mcInst, const OperandSpecifier *operand,

    InternalInstruction *insn)

{

  switch (operand->type) {

    default:

      //debug("Unexpected type for a R/M operand");

      return true;

    case TYPE_R8:

    case TYPE_R16:

    case TYPE_R32:

    case TYPE_R64:

    case TYPE_Rv:

    case TYPE_MM64:

    case TYPE_XMM:

    case TYPE_YMM:

    case TYPE_ZMM:

    case TYPE_VK:

    case TYPE_DEBUGREG:

    case TYPE_CONTROLREG:

    case TYPE_BNDR:

      return translateRMRegister(mcInst, insn);

    case TYPE_M:

    case TYPE_MVSIBX:

    case TYPE_MVSIBY:

    case TYPE_MVSIBZ:

      return translateRMMemory(mcInst, insn);

  }

}

/// translateFPRegister - Translates a stack position on the FPU stack to its

///   LLVM form, and appends it to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param stackPos     - The stack position to translate.

static void translateFPRegister(MCInst *mcInst, uint8_t stackPos)

{

  MCOperand_CreateReg0(mcInst, X86_ST0 + stackPos);

}

/// translateMaskRegister - Translates a 3-bit mask register number to

///   LLVM form, and appends it to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param maskRegNum   - Number of mask register from 0 to 7.

/// @return             - false on success; true otherwise.

static bool translateMaskRegister(MCInst *mcInst, uint8_t maskRegNum)

{

  if (maskRegNum >= 8) {

    // debug("Invalid mask register number");

    return true;

  }

  MCOperand_CreateReg0(mcInst, X86_K0 + maskRegNum);

  return false;

}

/// translateOperand - Translates an operand stored in an internal instruction

///   to LLVM's format and appends it to an MCInst.

///

/// @param mcInst       - The MCInst to append to.

/// @param operand      - The operand, as stored in the descriptor table.

/// @param insn         - The internal instruction.

/// @return             - false on success; true otherwise.

static bool translateOperand(MCInst *mcInst, const OperandSpecifier *operand, InternalInstruction *insn)

{

  switch (operand->encoding) {

    case ENCODING_REG:

      translateRegister(mcInst, insn->reg);

      return false;

    case ENCODING_WRITEMASK:

      return translateMaskRegister(mcInst, insn->writemask);

    CASE_ENCODING_RM:

    CASE_ENCODING_VSIB:

      return translateRM(mcInst, operand, insn);

    case ENCODING_IB:

    case ENCODING_IW:

    case ENCODING_ID:

    case ENCODING_IO:

    case ENCODING_Iv:

    case ENCODING_Ia:

      translateImmediate(mcInst, insn->immediates[insn->numImmediatesTranslated++], operand, insn);

      return false;

    case ENCODING_IRC:

      MCOperand_CreateImm0(mcInst, insn->RC);

      return false;

    case ENCODING_SI:

      return translateSrcIndex(mcInst, insn);

    case ENCODING_DI:

      return translateDstIndex(mcInst, insn);

    case ENCODING_RB:

    case ENCODING_RW:

    case ENCODING_RD:

    case ENCODING_RO:

    case ENCODING_Rv:

      translateRegister(mcInst, insn->opcodeRegister);

      return false;

    case ENCODING_FP:

      translateFPRegister(mcInst, insn->modRM & 7);

      return false;

    case ENCODING_VVVV:

      translateRegister(mcInst, insn->vvvv);

      return false;

    case ENCODING_DUP:

      return translateOperand(mcInst, &insn->operands[operand->type - TYPE_DUP0], insn);

    default:

      //debug("Unhandled operand encoding during translation");

      return true;

  }

}

static bool translateInstruction(MCInst *mcInst, InternalInstruction *insn)

{

  int index;

  if (!insn->spec) {

    //debug("Instruction has no specification");

    return true;

  }

  MCInst_clear(mcInst);

  MCInst_setOpcode(mcInst, insn->instructionID);

  // If when reading the prefix bytes we determined the overlapping 0xf2 or 0xf3

  // prefix bytes should be disassembled as xrelease and xacquire then set the

  // opcode to those instead of the rep and repne opcodes.

#ifndef CAPSTONE_X86_REDUCE

  if (insn->xAcquireRelease) {

    if (MCInst_getOpcode(mcInst) == X86_REP_PREFIX)

      MCInst_setOpcode(mcInst, X86_XRELEASE_PREFIX);

    else if (MCInst_getOpcode(mcInst) == X86_REPNE_PREFIX)

      MCInst_setOpcode(mcInst, X86_XACQUIRE_PREFIX);

  }

#endif

  insn->numImmediatesTranslated = 0;

  for (index = 0; index < X86_MAX_OPERANDS; ++index) {

    if (insn->operands[index].encoding != ENCODING_NONE) {

      if (translateOperand(mcInst, &insn->operands[index], insn)) {

        return true;

      }

    }

  }

  return false;

}

static int reader(const struct reader_info *info, uint8_t *byte, uint64_t address)

{

  if (address - info->offset >= info->size)

    // out of buffer range

    return -1;

  *byte = info->code[address - info->offset];

  return 0;

}

// copy x86 detail information from internal structure to public structure

static void update_pub_insn(cs_insn *pub, InternalInstruction *inter)

{

  if (inter->vectorExtensionType != 0) {

    memcpy(pub->detail->x86.opcode, inter->vectorExtensionPrefix, sizeof(pub->detail->x86.opcode));

  } else {

    if (inter->twoByteEscape) {

      if (inter->threeByteEscape) {

        pub->detail->x86.opcode[0] = inter->twoByteEscape;

        pub->detail->x86.opcode[1] = inter->threeByteEscape;

        pub->detail->x86.opcode[2] = inter->opcode;

      } else {

        pub->detail->x86.opcode[0] = inter->twoByteEscape;

        pub->detail->x86.opcode[1] = inter->opcode;

      }

    } else {

        pub->detail->x86.opcode[0] = inter->opcode;

    }

  }

  pub->detail->x86.rex = inter->rexPrefix;

  pub->detail->x86.addr_size = inter->addressSize;

  pub->detail->x86.modrm = inter->orgModRM;

  pub->detail->x86.encoding.modrm_offset = inter->modRMOffset;

  pub->detail->x86.sib = inter->sib;

  pub->detail->x86.sib_index = x86_map_sib_index(inter->sibIndex);

  pub->detail->x86.sib_scale = inter->sibScale;

  pub->detail->x86.sib_base = x86_map_sib_base(inter->sibBase);

  pub->detail->x86.disp = inter->displacement;

  if (inter->consumedDisplacement) {

    pub->detail->x86.encoding.disp_offset = inter->displacementOffset;

    pub->detail->x86.encoding.disp_size = inter->displacementSize;

  }

  pub->detail->x86.encoding.imm_offset = inter->immediateOffset;

  if (pub->detail->x86.encoding.imm_size == 0 && inter->immediateOffset != 0)

    pub->detail->x86.encoding.imm_size = inter->immediateSize;

}

void X86_init(MCRegisterInfo *MRI)

{

  // InitMCRegisterInfo(), X86GenRegisterInfo.inc

  // RI->InitMCRegisterInfo(X86RegDesc, 277,

  //                        RA, PC,

  //                        X86MCRegisterClasses, 86,

  //                        X86RegUnitRoots, 162, X86RegDiffLists, X86LaneMaskLists, X86RegStrings,

  //                        X86RegClassStrings,

  //                        X86SubRegIdxLists, 9,

  //                        X86SubRegIdxRanges, X86RegEncodingTable);

  /*

     InitMCRegisterInfo(X86RegDesc, 234,

     RA, PC,

     X86MCRegisterClasses, 79,

     X86RegUnitRoots, 119, X86RegDiffLists, X86RegStrings,

     X86SubRegIdxLists, 7,

     X86SubRegIdxRanges, X86RegEncodingTable);

  */

  MCRegisterInfo_InitMCRegisterInfo(MRI, X86RegDesc, 277,

      0, 0,

      X86MCRegisterClasses, 86,

      0, 0, X86RegDiffLists, 0,

      X86SubRegIdxLists, 9,

      0);

}

// Public interface for the disassembler

bool X86_getInstruction(csh ud, const uint8_t *code, size_t code_len,

    MCInst *instr, uint16_t *size, uint64_t address, void *_info)

{

  cs_struct *handle = (cs_struct *)(uintptr_t)ud;

  InternalInstruction insn = { 0 };

  struct reader_info info;

  int ret;

  bool result;

  info.code = code;

  info.size = code_len;

  info.offset = address;

  if (instr->flat_insn->detail) {

    // instr->flat_insn->detail initialization: 3 alternatives

    // 1. The whole structure, this is how it's done in other arch disassemblers

    // Probably overkill since cs_detail is huge because of the 36 operands of ARM

    //memset(instr->flat_insn->detail, 0, sizeof(cs_detail));

    // 2. Only the part relevant to x86

    memset(instr->flat_insn->detail, 0, offsetof(cs_detail, x86) + sizeof(cs_x86));

    // 3. The relevant part except for x86.operands

    // sizeof(cs_x86) is 0x1c0, sizeof(x86.operands) is 0x180

    // marginally faster, should be okay since x86.op_count is set to 0

    //memset(instr->flat_insn->detail, 0, offsetof(cs_detail, x86)+offsetof(cs_x86, operands));

  }

  if (handle->mode & CS_MODE_16)

    ret = decodeInstruction(&insn,

        reader, &info,

        address,

        MODE_16BIT);

  else if (handle->mode & CS_MODE_32)

    ret = decodeInstruction(&insn,

        reader, &info,

        address,

        MODE_32BIT);

  else

    ret = decodeInstruction(&insn,

        reader, &info,

        address,

        MODE_64BIT);

  if (ret) {

    // *size = (uint16_t)(insn.readerCursor - address);

    return false;

  } else {

    *size = (uint16_t)insn.length;

    result = (!translateInstruction(instr, &insn)) ?  true : false;

    if (result) {

      unsigned Flags = X86_IP_NO_PREFIX;

      instr->imm_size = insn.immSize;