src/libs/udis86/syn-att.c

   1 /* udis86 - libudis86/syn-att.c
   2  *
   3  * Copyright (c) 2002-2009 Vivek Thampi
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without modification,
   7  * are permitted provided that the following conditions are met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright notice,
  10  *       this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above copyright notice,
  12  *       this list of conditions and the following disclaimer in the documentation
  13  *       and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  22  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  24  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 #include "types.h"
  27 #include "extern.h"
  28 #include "decode.h"
  29 #include "itab.h"
  30 #include "syn.h"
  31 #include "udint.h"
  32
  33 /* -----------------------------------------------------------------------------
  34  * opr_cast() - Prints an operand cast.
  35  * -----------------------------------------------------------------------------
  36  */
  37 static void
  38 opr_cast(struct ud* u, struct ud_operand* op)
  39 {
  40   switch(op->size) {
  41   case 16 : case 32 :
  42     ud_asmprintf(u, "*");   break;
  43   default: break;
  44   }
  45 }
  46
  47 /* -----------------------------------------------------------------------------
  48  * gen_operand() - Generates assembly output for each operand.
  49  * -----------------------------------------------------------------------------
  50  */
  51 static void
  52 gen_operand(struct ud* u, struct ud_operand* op)
  53 {
  54   switch(op->type) {
  55   case UD_OP_CONST:
  56     ud_asmprintf(u, "$0x%x", op->lval.udword);
  57     break;
  58
  59   case UD_OP_REG:
  60     ud_asmprintf(u, "%%%s", ud_reg_tab[op->base - UD_R_AL]);
  61     break;
  62
  63   case UD_OP_MEM:
  64     if (u->br_far) {
  65         opr_cast(u, op);
  66     }
  67     if (u->pfx_seg) {
  68       ud_asmprintf(u, "%%%s:", ud_reg_tab[u->pfx_seg - UD_R_AL]);
  69     }
  70     if (op->offset != 0) {
  71       ud_syn_print_mem_disp(u, op, 0);
  72     }
  73     if (op->base) {
  74       ud_asmprintf(u, "(%%%s", ud_reg_tab[op->base - UD_R_AL]);
  75     }
  76     if (op->index) {
  77       if (op->base) {
  78         ud_asmprintf(u, ",");
  79       } else {
  80         ud_asmprintf(u, "(");
  81       }
  82       ud_asmprintf(u, "%%%s", ud_reg_tab[op->index - UD_R_AL]);
  83     }
  84     if (op->scale) {
  85       ud_asmprintf(u, ",%d", op->scale);
  86     }
  87     if (op->base || op->index) {
  88       ud_asmprintf(u, ")");
  89     }
  90     break;
  91
  92   case UD_OP_IMM:
  93     ud_asmprintf(u, "$");
  94     ud_syn_print_imm(u, op);
  95     break;
  96
  97   case UD_OP_JIMM:
  98     ud_syn_print_addr(u, ud_syn_rel_target(u, op));
  99     break;
 100
 101   case UD_OP_PTR:
 102     switch (op->size) {
 103       case 32:
 104         ud_asmprintf(u, "$0x%x, $0x%x", op->lval.ptr.seg,
 105           op->lval.ptr.off & 0xFFFF);
 106         break;
 107       case 48:
 108         ud_asmprintf(u, "$0x%x, $0x%x", op->lval.ptr.seg,
 109           op->lval.ptr.off);
 110         break;
 111     }
 112     break;
 113
 114   default: return;
 115   }
 116 }
 117
 118 /* =============================================================================
 119  * translates to AT&T syntax
 120  * =============================================================================
 121  */
 122 extern void
 123 ud_translate_att(struct ud *u)
 124 {
 125   int size = 0;
 126   int star = 0;
 127
 128   /* check if P_OSO prefix is used */
 129   if (! P_OSO(u->itab_entry->prefix) && u->pfx_opr) {
 130   switch (u->dis_mode) {
 131     case 16:
 132       ud_asmprintf(u, "o32 ");
 133       break;
 134     case 32:
 135     case 64:
 136       ud_asmprintf(u, "o16 ");
 137       break;
 138   }
 139   }
 140
 141   /* check if P_ASO prefix was used */
 142   if (! P_ASO(u->itab_entry->prefix) && u->pfx_adr) {
 143   switch (u->dis_mode) {
 144     case 16:
 145       ud_asmprintf(u, "a32 ");
 146       break;
 147     case 32:
 148       ud_asmprintf(u, "a16 ");
 149       break;
 150     case 64:
 151       ud_asmprintf(u, "a32 ");
 152       break;
 153   }
 154   }
 155
 156   if (u->pfx_lock)
 157     ud_asmprintf(u,  "lock ");
 158   if (u->pfx_rep) {
 159     ud_asmprintf(u, "rep ");
 160   } else if (u->pfx_rep) {
 161     ud_asmprintf(u, "repe ");
 162   } else if (u->pfx_repne) {
 163     ud_asmprintf(u, "repne ");
 164   }
 165
 166   /* special instructions */
 167   switch (u->mnemonic) {
 168   case UD_Iretf:
 169     ud_asmprintf(u, "lret ");
 170     break;
 171   case UD_Idb:
 172     ud_asmprintf(u, ".byte 0x%x", u->operand[0].lval.ubyte);
 173     return;
 174   case UD_Ijmp:
 175   case UD_Icall:
 176     if (u->br_far) ud_asmprintf(u,  "l");
 177         if (u->operand[0].type == UD_OP_REG) {
 178           star = 1;
 179         }
 180     ud_asmprintf(u, "%s", ud_lookup_mnemonic(u->mnemonic));
 181     break;
 182   case UD_Ibound:
 183   case UD_Ienter:
 184     if (u->operand[0].type != UD_NONE)
 185       gen_operand(u, &u->operand[0]);
 186     if (u->operand[1].type != UD_NONE) {
 187       ud_asmprintf(u, ",");
 188       gen_operand(u, &u->operand[1]);
 189     }
 190     return;
 191   default:
 192     ud_asmprintf(u, "%s", ud_lookup_mnemonic(u->mnemonic));
 193   }
 194
 195   if (size == 8)
 196   ud_asmprintf(u, "b");
 197   else if (size == 16)
 198   ud_asmprintf(u, "w");
 199   else if (size == 64)
 200   ud_asmprintf(u, "q");
 201
 202   if (star) {
 203     ud_asmprintf(u, " *");
 204   } else {
 205     ud_asmprintf(u, " ");
 206   }
 207
 208   if (u->operand[2].type != UD_NONE) {
 209   gen_operand(u, &u->operand[2]);
 210   ud_asmprintf(u, ", ");
 211   }
 212
 213   if (u->operand[1].type != UD_NONE) {
 214   gen_operand(u, &u->operand[1]);
 215   ud_asmprintf(u, ", ");
 216   }
 217
 218   if (u->operand[0].type != UD_NONE)
 219   gen_operand(u, &u->operand[0]);
 220 }
 221
 222 /*
 223 vim: set ts=2 sw=2 expandtab
 224 */