0
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1 /*
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2 * Copyright 2002-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.asm.x86;
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26
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27 import sun.jvm.hotspot.asm.*;
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28
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29 // basic instruction decoder class
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30 public class InstructionDecoder implements /* imports */ X86Opcodes , RTLDataTypes, RTLOperations {
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31
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32 protected String name;
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33 protected int addrMode1;
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34 protected int operandType1;
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35 protected int addrMode2;
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36 protected int operandType2;
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37 protected int addrMode3;
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38 protected int operandType3;
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39
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40 private int mod;
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41 private int regOrOpcode;
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42 private int rm;
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43 protected int prefixes;
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44
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45 protected int byteIndex;
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46 protected int instrStartIndex;
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47
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48 public InstructionDecoder(String name) {
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49 this.name = name;
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50 this.operandType1 = INVALID_OPERANDTYPE;
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51 this.operandType2 = INVALID_OPERANDTYPE;
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52 this.operandType3 = INVALID_OPERANDTYPE;
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53 this.addrMode1 = INVALID_ADDRMODE;
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54 this.addrMode2 = INVALID_ADDRMODE;
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55 this.addrMode3 = INVALID_ADDRMODE;
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56 }
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57 public InstructionDecoder(String name, int addrMode1, int operandType1) {
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58 this(name);
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59 this.addrMode1 = addrMode1;
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60 this.operandType1 = operandType1;
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61 }
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62 public InstructionDecoder(String name, int addrMode1, int operandType1, int addrMode2, int operandType2) {
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63 this(name, addrMode1, operandType1);
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64 this.addrMode2 = addrMode2;
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65 this.operandType2 = operandType2;
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66 }
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67 public InstructionDecoder(String name, int addrMode1, int operandType1, int addrMode2, int operandType2,
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68 int addrMode3, int operandType3) {
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69 this(name, addrMode1, operandType1, addrMode2, operandType2);
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70 this.addrMode3 = addrMode3;
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71 this.operandType3 = operandType3;
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72 }
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73 // "operand1"
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74 protected Operand getOperand1(byte[] bytesArray, boolean operandSize, boolean addrSize) {
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75 if( (addrMode1 != INVALID_ADDRMODE) && (operandType1 != INVALID_OPERANDTYPE) )
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76 return getOperand(bytesArray, addrMode1, operandType1, operandSize, addrSize);
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77 else
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78 return null;
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79 }
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80
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81 // "operand2"
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82 protected Operand getOperand2(byte[] bytesArray, boolean operandSize, boolean addrSize) {
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83 if( (addrMode2 != INVALID_ADDRMODE) && (operandType2 != INVALID_OPERANDTYPE) )
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84 return getOperand(bytesArray, addrMode2, operandType2, operandSize, addrSize);
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85 else
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86 return null;
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87 }
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88
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89 // "operand3"
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90 protected Operand getOperand3(byte[] bytesArray, boolean operandSize, boolean addrSize) {
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91 if( (addrMode3 != INVALID_ADDRMODE) && (operandType3 != INVALID_OPERANDTYPE) )
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92 return getOperand(bytesArray, addrMode3, operandType3, operandSize, addrSize);
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93 else
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94 return null;
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95 }
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96
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97 static int readInt32(byte[] bytesArray, int index) {
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98 int ret = 0;
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99 ret = readByte(bytesArray, index);
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100 ret |= readByte(bytesArray, index+1) << 8;
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101 ret |= readByte(bytesArray, index+2) << 16;
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102 ret |= readByte(bytesArray, index+3) << 24;
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103 return ret;
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104 }
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105 static int readInt16(byte[] bytesArray, int index) {
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106 int ret = 0;
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107 ret = readByte(bytesArray, index);
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108 ret |= readByte(bytesArray, index+1) << 8;
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109 return ret;
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110 }
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111 static int readByte(byte[] bytesArray, int index) {
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112 int ret = 0;
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113 if (index < bytesArray.length) {
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114 ret = (int)bytesArray[index];
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115 ret = ret & 0xff;
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116 }
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117 return ret;
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118 }
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119 private boolean isModRMPresent(int addrMode) {
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120 if( (addrMode == ADDR_E) || (addrMode == ADDR_G) || (addrMode == ADDR_FPREG) || (addrMode == ADDR_Q) || (addrMode == ADDR_W) )
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121 return true;
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122 else
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123 return false;
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124 }
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125 public int getCurrentIndex() {
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126 return byteIndex;
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127 }
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128
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129 public Instruction decode(byte[] bytesArray, int index, int instrStartIndex, int segmentOverride, int prefixes, X86InstructionFactory factory) {
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130 this.byteIndex = index;
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131 this.instrStartIndex = instrStartIndex;
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132 this.prefixes = prefixes;
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133 boolean operandSize; //operand-size prefix
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134 boolean addrSize; //address-size prefix
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135 if ( ( (prefixes & PREFIX_DATA) ^ segmentOverride ) == 1)
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136 operandSize = true;
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137 else
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138 operandSize = false;
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139 if ( ((prefixes & PREFIX_ADR) ^ segmentOverride) == 1)
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140 addrSize = true;
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141 else
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142 addrSize = false;
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143 this.name = getCorrectOpcodeName(name, prefixes, operandSize, addrSize);
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144
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145 //Fetch the mod/reg/rm byte only if it is present.
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146 if( isModRMPresent(addrMode1) || isModRMPresent(addrMode2) || isModRMPresent(addrMode3) ) {
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147
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148 int ModRM = readByte(bytesArray, byteIndex);
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149 byteIndex++;
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150 mod = (ModRM >> 6) & 3;
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151 regOrOpcode = (ModRM >> 3) & 7;
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152 rm = ModRM & 7;
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153 }
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154 return decodeInstruction(bytesArray, operandSize, addrSize, factory);
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155 }
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156
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157 protected Instruction decodeInstruction(byte[] bytesArray, boolean operandSize, boolean addrSize, X86InstructionFactory factory) {
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158 Operand op1 = getOperand1(bytesArray, operandSize, addrSize);
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159 Operand op2 = getOperand2(bytesArray, operandSize, addrSize);
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160 Operand op3 = getOperand3(bytesArray, operandSize, addrSize);
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161 int size = byteIndex - instrStartIndex;
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162 return factory.newGeneralInstruction(name, op1, op2, op3, size, prefixes);
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163 }
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164
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165 // capital letters in template are macros
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166 private String getCorrectOpcodeName(String oldName, int prefixes, boolean operandSize, boolean addrSize) {
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167 StringBuffer newName = new StringBuffer(oldName);
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168 int index = 0;
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169 for(index=0; index<oldName.length(); index++) {
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170 switch (oldName.charAt(index)) {
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171 case 'C': /* For jcxz/jecxz */
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172 if (addrSize)
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173 newName.setCharAt(index, 'e');
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174 index++;
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175 break;
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176 case 'N':
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177 if ((prefixes & PREFIX_FWAIT) == 0)
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178 newName.setCharAt(index, 'n');
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179 index++;
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180 break;
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181 case 'S':
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182 /* operand size flag */
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183 if (operandSize == true)
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184 newName.setCharAt(index, 'l');
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185 else
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186 newName.setCharAt(index, 'w');
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187 index++;
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188 break;
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189 default:
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190 break;
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191 }
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192 }
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193 return newName.toString();
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194 }
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195
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196 //IA-32 Intel Architecture Software Developer's Manual Volume 2
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197 //Refer to Chapter 2 - Instruction Format
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198
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199 //Get the Operand object from the address type and the operand type
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200 private Operand getOperand(byte[] bytesArray, int addrMode, int operandType, boolean operandSize, boolean addrSize) {
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201 Operand op = null;
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202 switch(addrMode) {
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203 case ADDR_E:
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204 case ADDR_W: //SSE: ModR/M byte specifies either 128 bit XMM register or memory
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205 case ADDR_Q: //SSE: ModR/M byte specifies either 128 bit MMX register or memory
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206 X86SegmentRegister segReg = getSegmentRegisterFromPrefix(prefixes);
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207
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208 if (mod == 3) { //Register operand, no SIB follows
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209 if (addrMode == ADDR_E) {
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210 switch (operandType) {
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211 case b_mode:
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212 op = X86Registers.getRegister8(rm);
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213 break;
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214 case w_mode:
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215 op = X86Registers.getRegister16(rm);
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216 break;
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217 case v_mode:
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218 if (operandSize == true) //Operand size prefix is present
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219 op = X86Registers.getRegister32(rm);
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220 else
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221 op = X86Registers.getRegister16(rm);
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222 break;
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223 case p_mode:
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224 X86Register reg;
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225 if (operandSize == true) //Operand size prefix is present
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226 reg = X86Registers.getRegister32(rm);
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227 else
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228 reg = X86Registers.getRegister16(rm);
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229
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230 op = new X86RegisterIndirectAddress(segReg, reg, null, 0);
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231 break;
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232 default:
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233 break;
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234 }
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235 } else if (addrMode == ADDR_W) {
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236 op = X86XMMRegisters.getRegister(rm);
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237 } else if (addrMode == ADDR_Q) {
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238 op = X86MMXRegisters.getRegister(rm);
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239 }
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240
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241 } else { //mod != 3
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242 //SIB follows for (rm==4), SIB gives scale, index and base in this case
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243 //disp32 is present for (mod==0 && rm==5) || (mod==2)
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244 //disp8 is present for (mod==1)
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245 //for (rm!=4) base is register at rm.
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246 int scale = 0;
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247 int index = 0;
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248 int base = 0;
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249 long disp = 0;
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250 if(rm == 4) {
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251 int sib = readByte(bytesArray, byteIndex);
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252 byteIndex++;
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253 scale = (sib >> 6) & 3;
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254 index = (sib >> 3) & 7;
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255 base = sib & 7;
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256 }
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257
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258 switch (mod) {
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259 case 0:
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260 switch(rm) {
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261 case 4:
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262 if(base == 5) {
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263 disp = readInt32(bytesArray, byteIndex);
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264 byteIndex += 4;
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265 if (index != 4) {
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266 op = new X86RegisterIndirectAddress(segReg, null, X86Registers.getRegister32(index), disp, scale);
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267 } else {
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268 op = new X86RegisterIndirectAddress(segReg, null, null, disp, scale);
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269 }
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270 }
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271 else {
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272 if (index != 4) {
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273 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), X86Registers.getRegister32(index), 0, scale);
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274 } else {
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275 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), null, 0, scale);
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276 }
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277 }
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278 break;
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279 case 5:
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280 disp = readInt32(bytesArray, byteIndex);
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281 byteIndex += 4;
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282 //Create an Address object only with displacement
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283 op = new X86RegisterIndirectAddress(segReg, null, null, disp);
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284 break;
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285 default:
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286 base = rm;
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287 //Create an Address object only with base
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288 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), null, 0);
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289 break;
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290 }
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291 break;
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292 case 1:
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293 disp = (byte)readByte(bytesArray, byteIndex);
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294 byteIndex++;
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295 if (rm !=4) {
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296 base = rm;
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297 //Address with base and disp only
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298 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), null, disp);
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299 } else {
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300 if (index != 4) {
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301 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), X86Registers.getRegister32(index), disp, scale);
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302 } else {
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303 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), null, disp, scale);
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304 }
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305 }
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306 break;
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307 case 2:
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308 disp = readInt32(bytesArray, byteIndex);
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309 byteIndex += 4;
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310 if (rm !=4) {
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311 base = rm;
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312 //Address with base and disp
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313 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), null, disp);
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314 } else if (index != 4) {
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315 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), X86Registers.getRegister32(index), disp, scale);
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316 } else {
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317 op = new X86RegisterIndirectAddress(segReg, X86Registers.getRegister32(base), null, disp, scale);
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318 }
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319 break;
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320 }
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321 }
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322 break;
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323
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324 case ADDR_I:
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325 switch (operandType) {
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326 case b_mode:
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327 op = new Immediate(new Integer(readByte(bytesArray, byteIndex)));
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328 byteIndex++;
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329 break;
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330 case w_mode:
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331 op = new Immediate(new Integer(readInt16(bytesArray, byteIndex)));
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332 byteIndex += 2;
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333 break;
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334 case v_mode:
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335 if (operandSize == true) { //Operand size prefix is present
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336 op = new Immediate(new Integer(readInt32(bytesArray, byteIndex)));
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337 byteIndex += 4;
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338 } else {
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339 op = new Immediate(new Integer(readInt16(bytesArray, byteIndex)));
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340 byteIndex += 2;
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341 }
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342 break;
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343 default:
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344 break;
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345 }
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346 break;
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347 case ADDR_REG: //registers
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348 switch(operandType) {
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349 case EAX:
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350 case ECX:
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351 case EDX:
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352 case EBX:
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353 case ESP:
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354 case EBP:
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355 case ESI:
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356 case EDI:
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357 if(operandSize == true) {
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358 op = X86Registers.getRegister32(operandType - EAX);
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359 }
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360 else {
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361 op = X86Registers.getRegister16(operandType - EAX);
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362 }
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363 break;
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364 case AX:
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365 case CX:
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366 case DX:
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367 case BX:
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368 case SP:
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369 case BP:
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370 case SI:
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371 case DI:
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372 op = X86Registers.getRegister16(operandType - AX);
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373 break;
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374 case AL:
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375 case CL:
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376 case DL:
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377 case BL:
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378 case AH:
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379 case CH:
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380 case DH:
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381 case BH:
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382 op = X86Registers.getRegister8(operandType - AL);
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383 break;
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384 case ES: //ES, CS, SS, DS, FS, GS
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385 case CS:
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386 case SS:
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387 case DS:
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388 case FS:
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389 case GS:
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390 op = X86SegmentRegisters.getSegmentRegister(operandType - ES);
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391 break;
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392 }
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393 break;
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394 case ADDR_DIR: //segment and offset
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395 long segment = 0;
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396 long offset = 0;
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397 switch (operandType) {
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398 case p_mode:
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399 if (addrSize == true) {
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400 offset = readInt32(bytesArray, byteIndex);
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401 byteIndex += 4;
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402 segment = readInt16(bytesArray, byteIndex);
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403 byteIndex += 2;
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404 } else {
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405 offset = readInt16(bytesArray, byteIndex);
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406 byteIndex += 2;
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407 segment = readInt16(bytesArray, byteIndex);
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408 byteIndex += 2;
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409 }
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410 op = new X86DirectAddress(segment, offset); //with offset
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411 break;
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412 case v_mode:
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413 if (addrSize == true) {
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414 offset = readInt32(bytesArray, byteIndex);
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415 byteIndex += 4;
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416 } else {
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417 offset = readInt16(bytesArray, byteIndex);
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418 byteIndex += 2;
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419 }
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420 op = new X86DirectAddress(offset); //with offset
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421 break;
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422 default:
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423 break;
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424 }
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425 break;
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426 case ADDR_G:
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427 switch (operandType) {
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428 case b_mode:
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429 op = X86Registers.getRegister8(regOrOpcode);
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430 break;
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431 case w_mode:
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432 op = X86Registers.getRegister16(regOrOpcode);
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433 break;
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434 case d_mode:
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435 op = X86Registers.getRegister32(regOrOpcode);
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436 break;
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437 case v_mode:
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438 if (operandSize == true)
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439 op = X86Registers.getRegister32(regOrOpcode);
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440 else
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441 op = X86Registers.getRegister16(regOrOpcode);
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442 break;
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443 default:
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444 break;
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445 }
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446 break;
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447 case ADDR_SEG:
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448 op = X86SegmentRegisters.getSegmentRegister(regOrOpcode);
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449 break;
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450 case ADDR_OFF:
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451 int off = 0;
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452 if (addrSize == true) {
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453 off = readInt32(bytesArray, byteIndex);
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454 byteIndex += 4;
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455 }
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456 else {
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457 off = readInt16(bytesArray, byteIndex);
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458 byteIndex += 2;
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459 }
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460 op = new X86DirectAddress((long)off);
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461 break;
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462 case ADDR_J:
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463 long disp = 0;
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464 //The effective address is Instruction pointer + relative offset
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465 switch(operandType) {
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466 case b_mode:
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467 disp = (byte)readByte(bytesArray, byteIndex);
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468 byteIndex++;
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469 break;
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470 case v_mode:
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471 if (operandSize == true) {
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472 disp = readInt32(bytesArray, byteIndex);
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473 byteIndex += 4;
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474 }
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475 else {
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476 disp = readInt16(bytesArray, byteIndex);
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477 byteIndex += 2;
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478 }
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479 //disp = disp + (byteIndex-instrStartIndex);
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480 break;
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|
481 }
|
|
482 op = new X86PCRelativeAddress(disp);
|
|
483 break;
|
|
484 case ADDR_ESDI:
|
|
485 op = new X86SegmentRegisterAddress(X86SegmentRegisters.ES, X86Registers.DI);
|
|
486 break;
|
|
487 case ADDR_DSSI:
|
|
488 op = new X86SegmentRegisterAddress(X86SegmentRegisters.DS, X86Registers.SI);
|
|
489 break;
|
|
490 case ADDR_R:
|
|
491 switch (operandType) {
|
|
492 case b_mode:
|
|
493 op = X86Registers.getRegister8(mod);
|
|
494 break;
|
|
495 case w_mode:
|
|
496 op = X86Registers.getRegister16(mod);
|
|
497 break;
|
|
498 case d_mode:
|
|
499 op = X86Registers.getRegister32(mod);
|
|
500 break;
|
|
501 case v_mode:
|
|
502 if (operandSize == true)
|
|
503 op = X86Registers.getRegister32(mod);
|
|
504 else
|
|
505 op = X86Registers.getRegister16(mod);
|
|
506 break;
|
|
507 default:
|
|
508 break;
|
|
509 }
|
|
510 break;
|
|
511 case ADDR_FPREG:
|
|
512 switch (operandType) {
|
|
513 case 0:
|
|
514 op = X86FloatRegisters.getRegister(0);
|
|
515 break;
|
|
516 case 1:
|
|
517 op = X86FloatRegisters.getRegister(rm);
|
|
518 break;
|
|
519 }
|
|
520 break;
|
|
521
|
|
522 //SSE: reg field of ModR/M byte selects a 128-bit XMM register
|
|
523 case ADDR_V:
|
|
524 op = X86XMMRegisters.getRegister(regOrOpcode);
|
|
525 break;
|
|
526
|
|
527 //SSE: reg field of ModR/M byte selects a 64-bit MMX register
|
|
528 case ADDR_P:
|
|
529 op = X86MMXRegisters.getRegister(regOrOpcode);
|
|
530 break;
|
|
531 }
|
|
532 return op;
|
|
533 }
|
|
534
|
|
535 private X86SegmentRegister getSegmentRegisterFromPrefix(int prefixes) {
|
|
536 X86SegmentRegister segRegister = null;
|
|
537
|
|
538 if ( (prefixes & PREFIX_CS) != 0)
|
|
539 segRegister = X86SegmentRegisters.CS;
|
|
540 if ( (prefixes & PREFIX_DS) != 0)
|
|
541 segRegister = X86SegmentRegisters.DS;
|
|
542 if ( (prefixes & PREFIX_ES) != 0)
|
|
543 segRegister = X86SegmentRegisters.ES;
|
|
544 if ( (prefixes & PREFIX_FS) != 0)
|
|
545 segRegister = X86SegmentRegisters.FS;
|
|
546 if ( (prefixes & PREFIX_SS) != 0)
|
|
547 segRegister = X86SegmentRegisters.SS;
|
|
548 if ( (prefixes & PREFIX_GS) != 0)
|
|
549 segRegister = X86SegmentRegisters.GS;
|
|
550
|
|
551 return segRegister;
|
|
552 }
|
|
553
|
|
554 }
|