x64hook/libudis86/syn-intel.c

/* udis86 - libudis86/syn-intel.c
 *
 * Copyright (c) 2002-2013 Vivek Thampi
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice, 
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, 
 *       this list of conditions and the following disclaimer in the documentation 
 *       and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "types.h"
#include "extern.h"
#include "decode.h"
#include "itab.h"
#include "syn.h"
#include "udint.h"

/* -----------------------------------------------------------------------------
 * opr_cast() - Prints an operand cast.
 * -----------------------------------------------------------------------------
 */
static void 
opr_cast(struct ud* u, struct ud_operand* op)
{
  if (u->br_far) {
    ud_asmprintf(u, "far "); 
  }
  switch(op->size) {
  case  8: ud_asmprintf(u, "byte " ); break;
  case 16: ud_asmprintf(u, "word " ); break;
  case 32: ud_asmprintf(u, "dword "); break;
  case 64: ud_asmprintf(u, "qword "); break;
  case 80: ud_asmprintf(u, "tword "); break;
  default: break;
  }
}

/* -----------------------------------------------------------------------------
 * gen_operand() - Generates assembly output for each operand.
 * -----------------------------------------------------------------------------
 */
static void gen_operand(struct ud* u, struct ud_operand* op, int syn_cast)
{
  switch(op->type) {
  case UD_OP_REG:
    ud_asmprintf(u, "%s", ud_reg_tab[op->base - UD_R_AL]);
    break;

  case UD_OP_MEM:
    if (syn_cast) {
      opr_cast(u, op);
    }
    ud_asmprintf(u, "[");
    if (u->pfx_seg) {
      ud_asmprintf(u, "%s:", ud_reg_tab[u->pfx_seg - UD_R_AL]);
    }
    if (op->base) {
      ud_asmprintf(u, "%s", ud_reg_tab[op->base - UD_R_AL]);
    }
    if (op->index) {
      ud_asmprintf(u, "%s%s", op->base != UD_NONE? "+" : "",
                              ud_reg_tab[op->index - UD_R_AL]);
      if (op->scale) {
        ud_asmprintf(u, "*%d", op->scale);
      }
    }
    if (op->offset != 0) {
      ud_syn_print_mem_disp(u, op, (op->base  != UD_NONE || 
                                    op->index != UD_NONE) ? 1 : 0);
    }
    ud_asmprintf(u, "]");
    break;
      
  case UD_OP_IMM:
    ud_syn_print_imm(u, op);
    break;


  case UD_OP_JIMM:
    ud_syn_print_addr(u, ud_syn_rel_target(u, op));
    break;

  case UD_OP_PTR:
    switch (op->size) {
      case 32:
        ud_asmprintf(u, "word 0x%x:0x%x", op->lval.ptr.seg, 
          op->lval.ptr.off & 0xFFFF);
        break;
      case 48:
        ud_asmprintf(u, "dword 0x%x:0x%x", op->lval.ptr.seg, 
          op->lval.ptr.off);
        break;
    }
    break;

  case UD_OP_CONST:
    if (syn_cast) opr_cast(u, op);
    ud_asmprintf(u, "%d", op->lval.udword);
    break;

  default: return;
  }
}

/* =============================================================================
 * translates to intel syntax 
 * =============================================================================
 */
extern void
ud_translate_intel(struct ud* u)
{
  /* check if P_OSO prefix is used */
  if (!P_OSO(u->itab_entry->prefix) && u->pfx_opr) {
    switch (u->dis_mode) {
    case 16: ud_asmprintf(u, "o32 "); break;
    case 32:
    case 64: ud_asmprintf(u, "o16 "); break;
    }
  }

  /* check if P_ASO prefix was used */
  if (!P_ASO(u->itab_entry->prefix) && u->pfx_adr) {
    switch (u->dis_mode) {
    case 16: ud_asmprintf(u, "a32 "); break;
    case 32: ud_asmprintf(u, "a16 "); break;
    case 64: ud_asmprintf(u, "a32 "); break;
    }
  }

  if (u->pfx_seg &&
      u->operand[0].type != UD_OP_MEM &&
      u->operand[1].type != UD_OP_MEM ) {
    ud_asmprintf(u, "%s ", ud_reg_tab[u->pfx_seg - UD_R_AL]);
  }

  if (u->pfx_lock) {
    ud_asmprintf(u, "lock ");
  }
  if (u->pfx_rep) {
    ud_asmprintf(u, "rep ");
  } else if (u->pfx_repe) {
    ud_asmprintf(u, "repe ");
  } else if (u->pfx_repne) {
    ud_asmprintf(u, "repne ");
  }

  /* print the instruction mnemonic */
  ud_asmprintf(u, "%s", ud_lookup_mnemonic(u->mnemonic));

  if (u->operand[0].type != UD_NONE) {
    int cast = 0;
    ud_asmprintf(u, " ");
    if (u->operand[0].type == UD_OP_MEM) {
      if (u->operand[1].type == UD_OP_IMM   ||
          u->operand[1].type == UD_OP_CONST ||
          u->operand[1].type == UD_NONE     ||
          (u->operand[0].size != u->operand[1].size && 
           u->operand[1].type != UD_OP_REG)) {
          cast = 1;
      } else if (u->operand[1].type == UD_OP_REG &&
                 u->operand[1].base == UD_R_CL) {
          switch (u->mnemonic) {
          case UD_Ircl:
          case UD_Irol:
          case UD_Iror:
          case UD_Ircr:
          case UD_Ishl:
          case UD_Ishr:
          case UD_Isar:
              cast = 1;
              break;
          default: break;
          }
      }
    }
    gen_operand(u, &u->operand[0], cast);
  }

  if (u->operand[1].type != UD_NONE) {
    int cast = 0;
    ud_asmprintf(u, ", ");
    if (u->operand[1].type == UD_OP_MEM &&
        u->operand[0].size != u->operand[1].size && 
        !ud_opr_is_sreg(&u->operand[0])) {
      cast = 1;
    }
    gen_operand(u, &u->operand[1], cast);
  }

  if (u->operand[2].type != UD_NONE) {
    ud_asmprintf(u, ", ");
    gen_operand(u, &u->operand[2], 0);
  }
}

/*
vim: set ts=2 sw=2 expandtab
*/