/src/capstonenext/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

#ifdef _MSC_VER
// disable MSVC's warning on strncpy()
#pragma warning(disable : 4996)
// disable MSVC's warning on strncpy()
#pragma warning(disable : 28719)
#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_opt != 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:
      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);

  // initialize access
  memset(access, 0, CS_X86_MAXIMUM_OPERAND_SIZE * sizeof(access[0]));

  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_opt) {
#ifndef CAPSTONE_DIET
    uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
      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_opt) {
#ifndef CAPSTONE_DIET
    uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
      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_opt) {
#ifndef CAPSTONE_DIET
    uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
      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_opt)
      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_opt)
    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_opt) {
#ifndef CAPSTONE_DIET
    uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE];
#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 = X86_REG_INVALID, 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);

  if (MI->csh->detail_opt) {
#ifndef CAPSTONE_DIET
    uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE] = { 0 };
#endif

    // first op can be embedded in the asm by llvm.
    // so we have to add the missing register as the first operand
    reg = X86_insn_reg_intel_h(MI->csh, MCInst_getOpcode(MI),
             &access1);
    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);

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

    printImm(MI, O, imm, true);

    if (MI->csh->detail_opt) {
#ifndef CAPSTONE_DIET
      uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
      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[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
      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[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
#ifndef CAPSTONE_DIET
    uint8_t access[CS_X86_MAXIMUM_OPERAND_SIZE];
#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_opt) {
      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, "*%" PRIu64, ScaleVal);
    NeedPlus = true;
  }

  if (MCOperand_isImm(DispSpec)) {
    int64_t DispVal = MCOperand_getImm(DispSpec);
    if (MI->csh->detail_opt)
      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_opt)
    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;
#ifndef CAPSTONE_X86_REDUCE
  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;
#endif
  }

  printMemReference(MI, OpNo, O);
}

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

#include "X86GenRegisterName1.inc"

#endif

Coverage Report

Created: 2026-08-13 06:59