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