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1 /* -----------------------------------------------------------------------------
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2 * syn-att.c
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3 *
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4 * Copyright (c) 2004, 2005, 2006 Vivek Mohan <vivek@sig9.com>
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5 * All rights reserved. See (LICENSE)
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6 * -----------------------------------------------------------------------------
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7 */
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8
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9 #include "types.h"
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10 #include "extern.h"
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11 #include "opcmap.h"
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12 #include "syn.h"
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13
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14 /* -----------------------------------------------------------------------------
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15 * opr_cast() - Prints an operand cast.
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16 * -----------------------------------------------------------------------------
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17 */
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18 static void
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19 opr_cast(struct ud* u, struct ud_operand* op)
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20 {
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21 switch(op->size) {
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22 case 16 : case 32 :
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23 mkasm(u, "*"); break;
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24 default: break;
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25 }
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26 }
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27
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28 /* -----------------------------------------------------------------------------
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29 * gen_operand() - Generates assembly output for each operand.
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30 * -----------------------------------------------------------------------------
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31 */
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32 static void
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33 gen_operand(struct ud* u, struct ud_operand* op)
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34 {
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35 switch(op->type) {
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36 case UD_OP_REG:
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37 mkasm(u, "%%%s", ud_reg_tab[op->base - UD_R_AL]);
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38 break;
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39
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40 case UD_OP_MEM:
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41 if (u->br_far) opr_cast(u, op);
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42 if (u->pfx_seg)
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43 mkasm(u, "%%%s:", ud_reg_tab[u->pfx_seg - UD_R_AL]);
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44 if (op->offset == 8) {
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45 if (op->lval.sbyte < 0)
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46 mkasm(u, "-0x%x", (-op->lval.sbyte) & 0xff);
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47 else mkasm(u, "0x%x", op->lval.sbyte);
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48 }
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49 else if (op->offset == 16)
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50 mkasm(u, "0x%x", op->lval.uword);
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51 else if (op->offset == 32)
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52 mkasm(u, "0x%lx", op->lval.udword);
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53 else if (op->offset == 64)
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54 mkasm(u, "0x" FMT64 "x", op->lval.uqword);
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55
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56 if (op->base)
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57 mkasm(u, "(%%%s", ud_reg_tab[op->base - UD_R_AL]);
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58 if (op->index) {
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59 if (op->base)
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60 mkasm(u, ",");
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61 else mkasm(u, "(");
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62 mkasm(u, "%%%s", ud_reg_tab[op->index - UD_R_AL]);
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63 }
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64 if (op->scale)
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65 mkasm(u, ",%d", op->scale);
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66 if (op->base || op->index)
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67 mkasm(u, ")");
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68 break;
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69
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70 case UD_OP_IMM:
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71 switch (op->size) {
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72 case 8: mkasm(u, "$0x%x", op->lval.ubyte); break;
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73 case 16: mkasm(u, "$0x%x", op->lval.uword); break;
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74 case 32: mkasm(u, "$0x%lx", op->lval.udword); break;
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75 case 64: mkasm(u, "$0x" FMT64 "x", op->lval.uqword); break;
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76 default: break;
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77 }
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78 break;
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79
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80 case UD_OP_JIMM:
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81 switch (op->size) {
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82 case 8:
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83 mkasm(u, "0x" FMT64 "x", u->pc + op->lval.sbyte);
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84 break;
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85 case 16:
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86 mkasm(u, "0x" FMT64 "x", u->pc + op->lval.sword);
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87 break;
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88 case 32:
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89 mkasm(u, "0x" FMT64 "x", u->pc + op->lval.sdword);
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90 break;
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91 default:break;
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92 }
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93 break;
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94
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95 case UD_OP_PTR:
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96 switch (op->size) {
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97 case 32:
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98 mkasm(u, "$0x%x, $0x%x", op->lval.ptr.seg,
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99 op->lval.ptr.off & 0xFFFF);
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100 break;
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101 case 48:
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102 mkasm(u, "$0x%x, $0x%lx", op->lval.ptr.seg,
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103 op->lval.ptr.off);
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104 break;
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105 }
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106 break;
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107
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108 default: return;
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109 }
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110 }
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111
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112 /* =============================================================================
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113 * translates to AT&T syntax
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114 * =============================================================================
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115 */
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116 extern void
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117 ud_translate_att(struct ud *u)
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118 {
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119 int size = 0;
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120
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121 /* check if P_O32 prefix is used */
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122 if (! P_O32(u->mapen->prefix) && u->pfx_opr) {
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123 switch (u->dis_mode) {
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124 case 16:
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125 mkasm(u, "o32 ");
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126 break;
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127 case 32:
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128 case 64:
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129 mkasm(u, "o16 ");
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130 break;
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131 }
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132 }
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133
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134 /* check if P_A32 prefix was used */
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135 if (! P_A32(u->mapen->prefix) && u->pfx_adr) {
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136 switch (u->dis_mode) {
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137 case 16:
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138 mkasm(u, "a32 ");
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139 break;
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140 case 32:
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141 mkasm(u, "a16 ");
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142 break;
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143 case 64:
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144 mkasm(u, "a32 ");
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145 break;
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146 }
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147 }
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148
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149 if (u->pfx_lock)
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150 mkasm(u, "lock ");
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151 if (u->pfx_rep)
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152 mkasm(u, "rep ");
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153 if (u->pfx_repne)
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154 mkasm(u, "repne ");
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155
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156 /* special instructions */
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157 switch (u->mnemonic) {
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158 case UD_Iretf:
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159 mkasm(u, "lret ");
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160 break;
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161 case UD_Idb:
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162 mkasm(u, ".byte 0x%x", u->operand[0].lval.ubyte);
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163 return;
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164 case UD_Ijmp:
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165 case UD_Icall:
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166 if (u->br_far) mkasm(u, "l");
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167 mkasm(u, "%s", ud_lookup_mnemonic(u->mnemonic));
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168 break;
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169 case UD_Ibound:
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170 case UD_Ienter:
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171 if (u->operand[0].type != UD_NONE)
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172 gen_operand(u, &u->operand[0]);
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173 if (u->operand[1].type != UD_NONE) {
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174 mkasm(u, ",");
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175 gen_operand(u, &u->operand[1]);
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176 }
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177 return;
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178 default:
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179 mkasm(u, "%s", ud_lookup_mnemonic(u->mnemonic));
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180 }
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181
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182 if (u->c1)
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183 size = u->operand[0].size;
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184 else if (u->c2)
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185 size = u->operand[1].size;
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186 else if (u->c3)
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187 size = u->operand[2].size;
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188
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189 if (size == 8)
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190 mkasm(u, "b");
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191 else if (size == 16)
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192 mkasm(u, "w");
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193 else if (size == 64)
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194 mkasm(u, "q");
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195
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196 mkasm(u, " ");
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197
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198 if (u->operand[2].type != UD_NONE) {
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199 gen_operand(u, &u->operand[2]);
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200 mkasm(u, ", ");
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201 }
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202
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203 if (u->operand[1].type != UD_NONE) {
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204 gen_operand(u, &u->operand[1]);
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205 mkasm(u, ", ");
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206 }
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207
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208 if (u->operand[0].type != UD_NONE)
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209 gen_operand(u, &u->operand[0]);
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210 }
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