1/* udis86 - libudis86/syn-intel.c
2 *
3 * Copyright (c) 2002-2013 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 */
37static void
38opr_cast(struct ud* u, struct ud_operand* op)
39{
40  if (u->br_far) {
41    ud_asmprintf(u, "far ");
42  }
43  switch(op->size) {
44  case  8:  ud_asmprintf(u, "byte " ); break;
45  case 16:  ud_asmprintf(u, "word " ); break;
46  case 32:  ud_asmprintf(u, "dword "); break;
47  case 64:  ud_asmprintf(u, "qword "); break;
48  case 80:  ud_asmprintf(u, "tword "); break;
49  case 128: ud_asmprintf(u, "oword "); break;
50  case 256: ud_asmprintf(u, "yword "); break;
51  default: break;
52  }
53}
54
55/* -----------------------------------------------------------------------------
56 * gen_operand() - Generates assembly output for each operand.
57 * -----------------------------------------------------------------------------
58 */
59static void gen_operand(struct ud* u, struct ud_operand* op, int syn_cast)
60{
61  switch(op->type) {
62  case UD_OP_REG:
63    ud_asmprintf(u, "%s", ud_reg_tab[op->base - UD_R_AL]);
64    break;
65
66  case UD_OP_MEM:
67    if (syn_cast) {
68      opr_cast(u, op);
69    }
70    ud_asmprintf(u, "[");
71    if (u->pfx_seg) {
72      ud_asmprintf(u, "%s:", ud_reg_tab[u->pfx_seg - UD_R_AL]);
73    }
74    if (op->base) {
75      ud_asmprintf(u, "%s", ud_reg_tab[op->base - UD_R_AL]);
76    }
77    if (op->index) {
78      ud_asmprintf(u, "%s%s", op->base != UD_NONE? "+" : "",
79                              ud_reg_tab[op->index - UD_R_AL]);
80      if (op->scale) {
81        ud_asmprintf(u, "*%d", op->scale);
82      }
83    }
84    if (op->offset != 0) {
85      ud_syn_print_mem_disp(u, op, (op->base  != UD_NONE ||
86                                    op->index != UD_NONE) ? 1 : 0);
87    }
88    ud_asmprintf(u, "]");
89    break;
90
91  case UD_OP_IMM:
92    ud_syn_print_imm(u, op);
93    break;
94
95
96  case UD_OP_JIMM:
97    ud_syn_print_addr(u, ud_syn_rel_target(u, op));
98    break;
99
100  case UD_OP_PTR:
101    switch (op->size) {
102      case 32:
103        ud_asmprintf(u, "word 0x%x:0x%x", op->lval.ptr.seg,
104          op->lval.ptr.off & 0xFFFF);
105        break;
106      case 48:
107        ud_asmprintf(u, "dword 0x%x:0x%x", op->lval.ptr.seg,
108          op->lval.ptr.off);
109        break;
110    }
111    break;
112
113  case UD_OP_CONST:
114    if (syn_cast) opr_cast(u, op);
115    ud_asmprintf(u, "%d", op->lval.udword);
116    break;
117
118  default: return;
119  }
120}
121
122/* =============================================================================
123 * translates to intel syntax
124 * =============================================================================
125 */
126extern void
127ud_translate_intel(struct ud* u)
128{
129  /* check if P_OSO prefix is used */
130  if (!P_OSO(u->itab_entry->prefix) && u->pfx_opr) {
131    switch (u->dis_mode) {
132    case 16: ud_asmprintf(u, "o32 "); break;
133    case 32:
134    case 64: ud_asmprintf(u, "o16 "); break;
135    }
136  }
137
138  /* check if P_ASO prefix was used */
139  if (!P_ASO(u->itab_entry->prefix) && u->pfx_adr) {
140    switch (u->dis_mode) {
141    case 16: ud_asmprintf(u, "a32 "); break;
142    case 32: ud_asmprintf(u, "a16 "); break;
143    case 64: ud_asmprintf(u, "a32 "); break;
144    }
145  }
146
147  if (u->pfx_seg &&
148      u->operand[0].type != UD_OP_MEM &&
149      u->operand[1].type != UD_OP_MEM ) {
150    ud_asmprintf(u, "%s ", ud_reg_tab[u->pfx_seg - UD_R_AL]);
151  }
152
153  if (u->pfx_lock) {
154    ud_asmprintf(u, "lock ");
155  }
156  if (u->pfx_rep) {
157    ud_asmprintf(u, "rep ");
158  } else if (u->pfx_repe) {
159    ud_asmprintf(u, "repe ");
160  } else if (u->pfx_repne) {
161    ud_asmprintf(u, "repne ");
162  }
163
164  /* print the instruction mnemonic */
165  ud_asmprintf(u, "%s", ud_lookup_mnemonic(u->mnemonic));
166
167  if (u->operand[0].type != UD_NONE) {
168    int cast = 0;
169    ud_asmprintf(u, " ");
170    if (u->operand[0].type == UD_OP_MEM) {
171      if (u->operand[1].type == UD_OP_IMM   ||
172          u->operand[1].type == UD_OP_CONST ||
173          u->operand[1].type == UD_NONE     ||
174          (u->operand[0].size != u->operand[1].size)) {
175          cast = 1;
176      } else if (u->operand[1].type == UD_OP_REG &&
177                 u->operand[1].base == UD_R_CL) {
178          switch (u->mnemonic) {
179          case UD_Ircl:
180          case UD_Irol:
181          case UD_Iror:
182          case UD_Ircr:
183          case UD_Ishl:
184          case UD_Ishr:
185          case UD_Isar:
186              cast = 1;
187              break;
188          default: break;
189          }
190      }
191    }
192    gen_operand(u, &u->operand[0], cast);
193  }
194
195  if (u->operand[1].type != UD_NONE) {
196    int cast = 0;
197    ud_asmprintf(u, ", ");
198    if (u->operand[1].type == UD_OP_MEM &&
199        u->operand[0].size != u->operand[1].size &&
200        !ud_opr_is_sreg(&u->operand[0])) {
201      cast = 1;
202    }
203    gen_operand(u, &u->operand[1], cast);
204  }
205
206  if (u->operand[2].type != UD_NONE) {
207    int cast = 0;
208    ud_asmprintf(u, ", ");
209    if (u->operand[2].type == UD_OP_MEM &&
210        u->operand[2].size != u->operand[1].size) {
211      cast = 1;
212    }
213    gen_operand(u, &u->operand[2], cast);
214  }
215
216  if (u->operand[3].type != UD_NONE) {
217    ud_asmprintf(u, ", ");
218    gen_operand(u, &u->operand[3], 0);
219  }
220}
221
222/*
223vim: set ts=2 sw=2 expandtab
224*/
225