/src/capstonev5/arch/X86/X86IntelInstPrinter.c

Source
//===-- X86IntelInstPrinter.cpp - Intel assembly instruction printing -----===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file includes code for rendering MCInst instances as Intel-style
// assembly.
//
//===----------------------------------------------------------------------===//

/* 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

#if !defined(CAPSTONE_HAS_OSXKERNEL)
#include <ctype.h>
#endif
#include <capstone/platform.h>

#if defined(CAPSTONE_HAS_OSXKERNEL)
#include <Availability.h>
#include <libkern/libkern.h>
#else
#include <stdio.h>
#include <stdlib.h>
#endif
#include <string.h>

#include "../../utils.h"
#include "../../MCInst.h"
#include "../../SStream.h"
#include "../../MCRegisterInfo.h"

#include "X86InstPrinter.h"
#include "X86Mapping.h"
#include "X86InstPrinterCommon.h"

#define GET_INSTRINFO_ENUM
#ifdef CAPSTONE_X86_REDUCE
#include "X86GenInstrInfo_reduce.inc"
#else
#include "X86GenInstrInfo.inc"
#endif

#define GET_REGINFO_ENUM
#include "X86GenRegisterInfo.inc"

#include "X86BaseInfo.h"

static void printMemReference(MCInst *MI, unsigned Op, SStream *O);
static void printOperand(MCInst *MI, unsigned OpNo, SStream *O);


static void set_mem_access(MCInst *MI, bool status)
{
  if (MI->csh->detail != CS_OPT_ON)
    return;

  MI->csh->doing_mem = status;
  if (!status)
    // done, create the next operand slot
    MI->flat_insn->detail->x86.op_count++;

}

static void printopaquemem(MCInst *MI, unsigned OpNo, SStream *O)
{
  // FIXME: do this with autogen
  // printf(">>> ID = %u\n", MI->flat_insn->id);
  switch(MI->flat_insn->id) {
    default:
      SStream_concat0(O, "ptr ");
      break;
    case X86_INS_SGDT:
    case X86_INS_SIDT:
    case X86_INS_LGDT:
    case X86_INS_LIDT:
    case X86_INS_FXRSTOR:
    case X86_INS_FXSAVE:
    case X86_INS_LJMP:
    case X86_INS_LCALL:
      // do not print "ptr"
      break;
  }

  switch(MI->csh->mode) {
    case CS_MODE_16:
      switch(MI->flat_insn->id) {
        default:
          MI->x86opsize = 2;
          break;
        case X86_INS_LJMP:
        case X86_INS_LCALL:
          MI->x86opsize = 4;
          break;
        case X86_INS_SGDT:
        case X86_INS_SIDT:
        case X86_INS_LGDT:
        case X86_INS_LIDT:
          MI->x86opsize = 6;
          break;
      }
      break;
    case CS_MODE_32:
      switch(MI->flat_insn->id) {
        default:
          MI->x86opsize = 4;
          break;
        case X86_INS_LJMP:
        case X86_INS_JMP:
        case X86_INS_LCALL:
        case X86_INS_SGDT:
        case X86_INS_SIDT:
        case X86_INS_LGDT:
        case X86_INS_LIDT:
          MI->x86opsize = 6;
          break;
      }
      break;
    case CS_MODE_64:
      switch(MI->flat_insn->id) {
        default:
          MI->x86opsize = 8;
          break;
        case X86_INS_LJMP:
        case X86_INS_LCALL:
        case X86_INS_SGDT:
        case X86_INS_SIDT:
        case X86_INS_LGDT:
        case X86_INS_LIDT:
          MI->x86opsize = 10;
          break;
      }
      break;
    default:  // never reach
      break;
  }

  printMemReference(MI, OpNo, O);
}

static void printi8mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "byte ptr ");
  MI->x86opsize = 1;
  printMemReference(MI, OpNo, O);
}

static void printi16mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  MI->x86opsize = 2;
  SStream_concat0(O, "word ptr ");
  printMemReference(MI, OpNo, O);
}

static void printi32mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  MI->x86opsize = 4;
  SStream_concat0(O, "dword ptr ");
  printMemReference(MI, OpNo, O);
}

static void printi64mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "qword ptr ");
  MI->x86opsize = 8;
  printMemReference(MI, OpNo, O);
}

static void printi128mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "xmmword ptr ");
  MI->x86opsize = 16;
  printMemReference(MI, OpNo, O);
}

static void printi512mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "zmmword ptr ");
  MI->x86opsize = 64;
  printMemReference(MI, OpNo, O);
}

#ifndef CAPSTONE_X86_REDUCE
static void printi256mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "ymmword ptr ");
  MI->x86opsize = 32;
  printMemReference(MI, OpNo, O);
}

static void printf32mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  switch(MCInst_getOpcode(MI)) {
    default:
      SStream_concat0(O, "dword ptr ");
      MI->x86opsize = 4;
      break;
    case X86_FSTENVm:
    case X86_FLDENVm:
      // TODO: fix this in tablegen instead
      switch(MI->csh->mode) {
        default:    // never reach
          break;
        case CS_MODE_16:
          MI->x86opsize = 14;
          break;
        case CS_MODE_32:
        case CS_MODE_64:
          MI->x86opsize = 28;
          break;
      }
      break;
  }

  printMemReference(MI, OpNo, O);
}

static void printf64mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  // TODO: fix COMISD in Tablegen instead (#1456)
  if (MI->op1_size == 16) {
    // printf("printf64mem id = %u\n", MCInst_getOpcode(MI));
    switch(MCInst_getOpcode(MI)) {
      default:
        SStream_concat0(O, "qword ptr ");
        MI->x86opsize = 8;
        break;
      case X86_MOVPQI2QImr:
      case X86_COMISDrm:
        SStream_concat0(O, "xmmword ptr ");
        MI->x86opsize = 16;
        break;
    }
  } else {
    SStream_concat0(O, "qword ptr ");
    MI->x86opsize = 8;
  }

  printMemReference(MI, OpNo, O);
}

static void printf80mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  switch(MCInst_getOpcode(MI)) {
    default:
      SStream_concat0(O, "xword ptr ");
      break;
    case X86_FBLDm:
    case X86_FBSTPm:
      break;
  }

  MI->x86opsize = 10;
  printMemReference(MI, OpNo, O);
}

static void printf128mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "xmmword ptr ");
  MI->x86opsize = 16;
  printMemReference(MI, OpNo, O);
}

static void printf256mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "ymmword ptr ");
  MI->x86opsize = 32;
  printMemReference(MI, OpNo, O);
}

static void printf512mem(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "zmmword ptr ");
  MI->x86opsize = 64;
  printMemReference(MI, OpNo, O);
}
#endif

static const char *getRegisterName(unsigned RegNo);
static void printRegName(SStream *OS, unsigned RegNo)
{
  SStream_concat0(OS, getRegisterName(RegNo));
}

// for MASM syntax, 0x123 = 123h, 0xA123 = 0A123h
// this function tell us if we need to have prefix 0 in front of a number
static bool need_zero_prefix(uint64_t imm)
{
  // find the first hex letter representing imm
  while(imm >= 0x10)
    imm >>= 4;

  if (imm < 0xa)
    return false;
  else  // this need 0 prefix
    return true;
}

static void printImm(MCInst *MI, SStream *O, int64_t imm, bool positive)
{
  if (positive) {
    // always print this number in positive form
    if (MI->csh->syntax == CS_OPT_SYNTAX_MASM) {
      if (imm < 0) {
        if (MI->op1_size) {
          switch(MI->op1_size) {
            default:
              break;
            case 1:
              imm &= 0xff;
              break;
            case 2:
              imm &= 0xffff;
              break;
            case 4:
              imm &= 0xffffffff;
              break;
          }
        }

        if (imm == 0x8000000000000000LL)  // imm == -imm
          SStream_concat0(O, "8000000000000000h");
        else if (need_zero_prefix(imm))
          SStream_concat(O, "0%"PRIx64"h", imm);
        else
          SStream_concat(O, "%"PRIx64"h", imm);
      } else {
        if (imm > HEX_THRESHOLD) {
          if (need_zero_prefix(imm))
            SStream_concat(O, "0%"PRIx64"h", imm);
          else
            SStream_concat(O, "%"PRIx64"h", imm);
        } else
          SStream_concat(O, "%"PRIu64, imm);
      }
    } else { // Intel syntax
      if (imm < 0) {
        if (MI->op1_size) {
          switch(MI->op1_size) {
            default:
              break;
            case 1:
              imm &= 0xff;
              break;
            case 2:
              imm &= 0xffff;
              break;
            case 4:
              imm &= 0xffffffff;
              break;
          }
        }

        SStream_concat(O, "0x%"PRIx64, imm);
      } else {
        if (imm > HEX_THRESHOLD)
          SStream_concat(O, "0x%"PRIx64, imm);
        else
          SStream_concat(O, "%"PRIu64, imm);
      }
    }
  } else {
    if (MI->csh->syntax == CS_OPT_SYNTAX_MASM) {
      if (imm < 0) {
        if (imm == 0x8000000000000000LL)  // imm == -imm
          SStream_concat0(O, "8000000000000000h");
        else if (imm < -HEX_THRESHOLD) {
          if (need_zero_prefix(imm))
            SStream_concat(O, "-0%"PRIx64"h", -imm);
          else
            SStream_concat(O, "-%"PRIx64"h", -imm);
        } else
          SStream_concat(O, "-%"PRIu64, -imm);
      } else {
        if (imm > HEX_THRESHOLD) {
          if (need_zero_prefix(imm))
            SStream_concat(O, "0%"PRIx64"h", imm);
          else
            SStream_concat(O, "%"PRIx64"h", imm);
        } else
          SStream_concat(O, "%"PRIu64, imm);
      }
    } else { // Intel syntax
      if (imm < 0) {
        if (imm == 0x8000000000000000LL)  // imm == -imm
          SStream_concat0(O, "0x8000000000000000");
        else if (imm < -HEX_THRESHOLD)
          SStream_concat(O, "-0x%"PRIx64, -imm);
        else
          SStream_concat(O, "-%"PRIu64, -imm);

      } else {
        if (imm > HEX_THRESHOLD)
          SStream_concat(O, "0x%"PRIx64, imm);
        else
          SStream_concat(O, "%"PRIu64, imm);
      }
    }
  }
}

// local printOperand, without updating public operands
static void _printOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
  MCOperand *Op  = MCInst_getOperand(MI, OpNo);
  if (MCOperand_isReg(Op)) {
    printRegName(O, MCOperand_getReg(Op));
  } else if (MCOperand_isImm(Op)) {
    int64_t imm = MCOperand_getImm(Op);
    printImm(MI, O, imm, MI->csh->imm_unsigned);
  }
}

#ifndef CAPSTONE_DIET
// copy & normalize access info
static void get_op_access(cs_struct *h, unsigned int id, uint8_t *access, uint64_t *eflags)
{
#ifndef CAPSTONE_DIET
  uint8_t i;
  const uint8_t *arr = X86_get_op_access(h, id, eflags);

  if (!arr) {
    access[0] = 0;
    return;
  }

  // copy to access but zero out CS_AC_IGNORE
  for(i = 0; arr[i]; i++) {
    if (arr[i] != CS_AC_IGNORE)
      access[i] = arr[i];
    else
      access[i] = 0;
  }

  // mark the end of array
  access[i] = 0;
#endif
}
#endif

static void printSrcIdx(MCInst *MI, unsigned Op, SStream *O)
{
  MCOperand *SegReg;
  int reg;

  if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
    uint8_t access[6];
#endif

    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_MEM;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->x86opsize;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.base = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.index = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.scale = 1;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = 0;

#ifndef CAPSTONE_DIET
    get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif
  }

  SegReg = MCInst_getOperand(MI, Op + 1);
  reg = MCOperand_getReg(SegReg);

  // If this has a segment register, print it.
  if (reg) {
    _printOperand(MI, Op + 1, O);
    if (MI->csh->detail) {
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_register_map(reg);
    }
    SStream_concat0(O, ":");
  }

  SStream_concat0(O, "[");
  set_mem_access(MI, true);
  printOperand(MI, Op, O);
  SStream_concat0(O, "]");
  set_mem_access(MI, false);
}

static void printDstIdx(MCInst *MI, unsigned Op, SStream *O)
{
  if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
    uint8_t access[6];
#endif

    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_MEM;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->x86opsize;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.base = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.index = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.scale = 1;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = 0;

#ifndef CAPSTONE_DIET
    get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif
  }

  // DI accesses are always ES-based on non-64bit mode
  if (MI->csh->mode != CS_MODE_64) {
    SStream_concat0(O, "es:[");
    if (MI->csh->detail) {
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_REG_ES;
    }
  } else
    SStream_concat0(O, "[");

  set_mem_access(MI, true);
  printOperand(MI, Op, O);
  SStream_concat0(O, "]");
  set_mem_access(MI, false);
}

static void printSrcIdx8(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "byte ptr ");
  MI->x86opsize = 1;
  printSrcIdx(MI, OpNo, O);
}

static void printSrcIdx16(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "word ptr ");
  MI->x86opsize = 2;
  printSrcIdx(MI, OpNo, O);
}

static void printSrcIdx32(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "dword ptr ");
  MI->x86opsize = 4;
  printSrcIdx(MI, OpNo, O);
}

static void printSrcIdx64(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "qword ptr ");
  MI->x86opsize = 8;
  printSrcIdx(MI, OpNo, O);
}

static void printDstIdx8(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "byte ptr ");
  MI->x86opsize = 1;
  printDstIdx(MI, OpNo, O);
}

static void printDstIdx16(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "word ptr ");
  MI->x86opsize = 2;
  printDstIdx(MI, OpNo, O);
}

static void printDstIdx32(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "dword ptr ");
  MI->x86opsize = 4;
  printDstIdx(MI, OpNo, O);
}

static void printDstIdx64(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "qword ptr ");
  MI->x86opsize = 8;
  printDstIdx(MI, OpNo, O);
}

static void printMemOffset(MCInst *MI, unsigned Op, SStream *O)
{
  MCOperand *DispSpec = MCInst_getOperand(MI, Op);
  MCOperand *SegReg = MCInst_getOperand(MI, Op + 1);
  int reg;

  if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
    uint8_t access[6];
#endif

    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_MEM;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->x86opsize;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.base = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.index = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.scale = 1;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = 0;

#ifndef CAPSTONE_DIET
    get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif
  }

  // If this has a segment register, print it.
  reg = MCOperand_getReg(SegReg);
  if (reg) {
    _printOperand(MI, Op + 1, O);
    SStream_concat0(O, ":");
    if (MI->csh->detail) {
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_register_map(reg);
    }
  }

  SStream_concat0(O, "[");

  if (MCOperand_isImm(DispSpec)) {
    int64_t imm = MCOperand_getImm(DispSpec);
    if (MI->csh->detail)
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = imm;

    if (imm < 0)
      printImm(MI, O, arch_masks[MI->csh->mode] & imm, true);
    else
      printImm(MI, O, imm, true);
  }

  SStream_concat0(O, "]");

  if (MI->csh->detail)
    MI->flat_insn->detail->x86.op_count++;

  if (MI->op1_size == 0)
    MI->op1_size = MI->x86opsize;
}

static void printU8Imm(MCInst *MI, unsigned Op, SStream *O)
{
  uint8_t val = MCOperand_getImm(MCInst_getOperand(MI, Op)) & 0xff;

  printImm(MI, O, val, true);

  if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
    uint8_t access[6];
#endif

    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_IMM;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].imm = val;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = 1;

#ifndef CAPSTONE_DIET
    get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif

    MI->flat_insn->detail->x86.op_count++;
  }
}

static void printMemOffs8(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "byte ptr ");
  MI->x86opsize = 1;
  printMemOffset(MI, OpNo, O);
}

static void printMemOffs16(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "word ptr ");
  MI->x86opsize = 2;
  printMemOffset(MI, OpNo, O);
}

static void printMemOffs32(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "dword ptr ");
  MI->x86opsize = 4;
  printMemOffset(MI, OpNo, O);
}

static void printMemOffs64(MCInst *MI, unsigned OpNo, SStream *O)
{
  SStream_concat0(O, "qword ptr ");
  MI->x86opsize = 8;
  printMemOffset(MI, OpNo, O);
}

static void printInstruction(MCInst *MI, SStream *O);

void X86_Intel_printInst(MCInst *MI, SStream *O, void *Info)
{
  x86_reg reg, reg2;
  enum cs_ac_type access1, access2;

  // printf("opcode = %u\n", MCInst_getOpcode(MI));

  // perhaps this instruction does not need printer
  if (MI->assembly[0]) {
    strncpy(O->buffer, MI->assembly, sizeof(O->buffer));
    return;
  }

  X86_lockrep(MI, O);
  printInstruction(MI, O);

  reg = X86_insn_reg_intel(MCInst_getOpcode(MI), &access1);
  if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
    uint8_t access[6] = {0};
#endif

    // first op can be embedded in the asm by llvm.
    // so we have to add the missing register as the first operand
    if (reg) {
      // shift all the ops right to leave 1st slot for this new register op
      memmove(&(MI->flat_insn->detail->x86.operands[1]), &(MI->flat_insn->detail->x86.operands[0]),
          sizeof(MI->flat_insn->detail->x86.operands[0]) * (ARR_SIZE(MI->flat_insn->detail->x86.operands) - 1));
      MI->flat_insn->detail->x86.operands[0].type = X86_OP_REG;
      MI->flat_insn->detail->x86.operands[0].reg = reg;
      MI->flat_insn->detail->x86.operands[0].size = MI->csh->regsize_map[reg];
      MI->flat_insn->detail->x86.operands[0].access = access1;
      MI->flat_insn->detail->x86.op_count++;
    } else {
      if (X86_insn_reg_intel2(MCInst_getOpcode(MI), &reg, &access1, &reg2, &access2)) {
        MI->flat_insn->detail->x86.operands[0].type = X86_OP_REG;
        MI->flat_insn->detail->x86.operands[0].reg = reg;
        MI->flat_insn->detail->x86.operands[0].size = MI->csh->regsize_map[reg];
        MI->flat_insn->detail->x86.operands[0].access = access1;
        MI->flat_insn->detail->x86.operands[1].type = X86_OP_REG;
        MI->flat_insn->detail->x86.operands[1].reg = reg2;
        MI->flat_insn->detail->x86.operands[1].size = MI->csh->regsize_map[reg2];
        MI->flat_insn->detail->x86.operands[1].access = access2;
        MI->flat_insn->detail->x86.op_count = 2;
      }
    }

#ifndef CAPSTONE_DIET
    get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
    MI->flat_insn->detail->x86.operands[0].access = access[0];
    MI->flat_insn->detail->x86.operands[1].access = access[1];
#endif
  }

  if (MI->op1_size == 0 && reg)
    MI->op1_size = MI->csh->regsize_map[reg];
}

/// printPCRelImm - This is used to print an immediate value that ends up
/// being encoded as a pc-relative value.
static void printPCRelImm(MCInst *MI, unsigned OpNo, SStream *O)
{
  MCOperand *Op = MCInst_getOperand(MI, OpNo);
  if (MCOperand_isImm(Op)) {
    int64_t imm = MCOperand_getImm(Op) + MI->flat_insn->size + MI->address;
    uint8_t opsize = X86_immediate_size(MI->Opcode, NULL);

    // truncat imm for non-64bit
    if (MI->csh->mode != CS_MODE_64) {
      imm = imm & 0xffffffff;
    }

    printImm(MI, O, imm, true);

    if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
      uint8_t access[6];
#endif

      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_IMM;
      // if op_count > 0, then this operand's size is taken from the destination op
      if (MI->flat_insn->detail->x86.op_count > 0)
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->flat_insn->detail->x86.operands[0].size;
      else if (opsize > 0)
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = opsize;
      else
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->imm_size;
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].imm = imm;

#ifndef CAPSTONE_DIET
      get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif

      MI->flat_insn->detail->x86.op_count++;
    }

    if (MI->op1_size == 0)
      MI->op1_size = MI->imm_size;
  }
}

static void printOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
  MCOperand *Op  = MCInst_getOperand(MI, OpNo);

  if (MCOperand_isReg(Op)) {
    unsigned int reg = MCOperand_getReg(Op);

    printRegName(O, reg);
    if (MI->csh->detail) {
      if (MI->csh->doing_mem) {
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.base = X86_register_map(reg);
      } else {
#ifndef CAPSTONE_DIET
        uint8_t access[6];
#endif

        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_REG;
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].reg = X86_register_map(reg);
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->csh->regsize_map[X86_register_map(reg)];

#ifndef CAPSTONE_DIET
        get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif

        MI->flat_insn->detail->x86.op_count++;
      }
    }

    if (MI->op1_size == 0)
      MI->op1_size = MI->csh->regsize_map[X86_register_map(reg)];
  } else if (MCOperand_isImm(Op)) {
    uint8_t encsize;
    int64_t imm = MCOperand_getImm(Op);
    uint8_t opsize = X86_immediate_size(MCInst_getOpcode(MI), &encsize);

    if (opsize == 1)    // print 1 byte immediate in positive form
      imm = imm & 0xff;

    // printf(">>> id = %u\n", MI->flat_insn->id);
    switch(MI->flat_insn->id) {
      default:
        printImm(MI, O, imm, MI->csh->imm_unsigned);
        break;

      case X86_INS_MOVABS:
      case X86_INS_MOV:
        // do not print number in negative form
        printImm(MI, O, imm, true);
        break;

      case X86_INS_IN:
      case X86_INS_OUT:
      case X86_INS_INT:
        // do not print number in negative form
        imm = imm & 0xff;
        printImm(MI, O, imm, true);
        break;

      case X86_INS_LCALL:
      case X86_INS_LJMP:
      case X86_INS_JMP:
        // always print address in positive form
        if (OpNo == 1) { // ptr16 part
          imm = imm & 0xffff;
          opsize = 2;
        } else
          opsize = 4;
        printImm(MI, O, imm, true);
        break;

      case X86_INS_AND:
      case X86_INS_OR:
      case X86_INS_XOR:
        // do not print number in negative form
        if (imm >= 0 && imm <= HEX_THRESHOLD)
          printImm(MI, O, imm, true);
        else {
          imm = arch_masks[opsize? opsize : MI->imm_size] & imm;
          printImm(MI, O, imm, true);
        }
        break;

      case X86_INS_RET:
      case X86_INS_RETF:
        // RET imm16
        if (imm >= 0 && imm <= HEX_THRESHOLD)
          printImm(MI, O, imm, true);
        else {
          imm = 0xffff & imm;
          printImm(MI, O, imm, true);
        }
        break;
    }

    if (MI->csh->detail) {
      if (MI->csh->doing_mem) {
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = imm;
      } else {
#ifndef CAPSTONE_DIET
        uint8_t access[6];
#endif

        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_IMM;
        if (opsize > 0) {
          MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = opsize;
          MI->flat_insn->detail->x86.encoding.imm_size = encsize;
        } else if (MI->flat_insn->detail->x86.op_count > 0) {
          if (MI->flat_insn->id != X86_INS_LCALL && MI->flat_insn->id != X86_INS_LJMP) {
            MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size =
              MI->flat_insn->detail->x86.operands[0].size;
          } else
            MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->imm_size;
        } else
          MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->imm_size;
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].imm = imm;

#ifndef CAPSTONE_DIET
        get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
        MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif

        MI->flat_insn->detail->x86.op_count++;
      }
    }
  }
}

static void printMemReference(MCInst *MI, unsigned Op, SStream *O)
{
  bool NeedPlus = false;
  MCOperand *BaseReg  = MCInst_getOperand(MI, Op + X86_AddrBaseReg);
  uint64_t ScaleVal = MCOperand_getImm(MCInst_getOperand(MI, Op + X86_AddrScaleAmt));
  MCOperand *IndexReg  = MCInst_getOperand(MI, Op + X86_AddrIndexReg);
  MCOperand *DispSpec = MCInst_getOperand(MI, Op + X86_AddrDisp);
  MCOperand *SegReg = MCInst_getOperand(MI, Op + X86_AddrSegmentReg);
  int reg;

  if (MI->csh->detail) {
#ifndef CAPSTONE_DIET
    uint8_t access[6];
#endif

    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].type = X86_OP_MEM;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].size = MI->x86opsize;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_REG_INVALID;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.base = X86_register_map(MCOperand_getReg(BaseReg));
        if (MCOperand_getReg(IndexReg) != X86_EIZ) {
            MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.index = X86_register_map(MCOperand_getReg(IndexReg));
        }
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.scale = (int)ScaleVal;
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = 0;

#ifndef CAPSTONE_DIET
    get_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags);
    MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].access = access[MI->flat_insn->detail->x86.op_count];
#endif
  }

  // If this has a segment register, print it.
  reg = MCOperand_getReg(SegReg);
  if (reg) {
    _printOperand(MI, Op + X86_AddrSegmentReg, O);
    if (MI->csh->detail) {
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.segment = X86_register_map(reg);
    }
    SStream_concat0(O, ":");
  }

  SStream_concat0(O, "[");

  if (MCOperand_getReg(BaseReg)) {
    _printOperand(MI, Op + X86_AddrBaseReg, O);
    NeedPlus = true;
  }

  if (MCOperand_getReg(IndexReg) && MCOperand_getReg(IndexReg) != X86_EIZ) {
    if (NeedPlus) SStream_concat0(O, " + ");
    _printOperand(MI, Op + X86_AddrIndexReg, O);
    if (ScaleVal != 1)
      SStream_concat(O, "*%u", ScaleVal);
    NeedPlus = true;
  }

  if (MCOperand_isImm(DispSpec)) {
    int64_t DispVal = MCOperand_getImm(DispSpec);
    if (MI->csh->detail)
      MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].mem.disp = DispVal;
    if (DispVal) {
      if (NeedPlus) {
        if (DispVal < 0) {
          SStream_concat0(O, " - ");
          printImm(MI, O, -DispVal, true);
        } else {
          SStream_concat0(O, " + ");
          printImm(MI, O, DispVal, true);
        }
      } else {
        // memory reference to an immediate address
        if (MI->csh->mode == CS_MODE_64)
          MI->op1_size = 8;
        if (DispVal < 0) {
          printImm(MI, O, arch_masks[MI->csh->mode] & DispVal, true);
        } else {
          printImm(MI, O, DispVal, true);
        }
      }

    } else {
      // DispVal = 0
      if (!NeedPlus)  // [0]
        SStream_concat0(O, "0");
    }
  }

  SStream_concat0(O, "]");

  if (MI->csh->detail)
    MI->flat_insn->detail->x86.op_count++;

  if (MI->op1_size == 0)
    MI->op1_size = MI->x86opsize;
}

static void printanymem(MCInst *MI, unsigned OpNo, SStream *O)
{
  switch(MI->Opcode) {
    default: break;
    case X86_LEA16r:
         MI->x86opsize = 2;
         break;
    case X86_LEA32r:
    case X86_LEA64_32r:
         MI->x86opsize = 4;
         break;
    case X86_LEA64r:
         MI->x86opsize = 8;
         break;
    case X86_BNDCL32rm:
    case X86_BNDCN32rm:
    case X86_BNDCU32rm:
    case X86_BNDSTXmr:
    case X86_BNDLDXrm:
    case X86_BNDCL64rm:
    case X86_BNDCN64rm:
    case X86_BNDCU64rm:
         MI->x86opsize = 16;
         break;
  }

  printMemReference(MI, OpNo, O);
}

#ifdef CAPSTONE_X86_REDUCE
#include "X86GenAsmWriter1_reduce.inc"
#else
#include "X86GenAsmWriter1.inc"
#endif

#include "X86GenRegisterName1.inc"

#endif

Coverage Report

Created: 2026-04-12 06:30