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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 public class FloatGRPDecoder extends FPInstructionDecoder {
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30
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31 final private int number;
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32
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33 //Please refer to IA-32 Intel Architecture Software Developer's Manual Volume 2
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34 //APPENDIX A - Escape opcodes
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35
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36 private static final FPInstructionDecoder floatGRPMap[][] = {
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37 /* d9_2 */
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38 {
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39 new FPInstructionDecoder("fnop"),
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40 null,
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41 null,
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42 null,
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43 null,
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44 null,
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45 null,
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46 null
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47 },
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48 /* d9_4 */
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49 {
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50 new FPInstructionDecoder("fchs"),
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51 new FPInstructionDecoder("fabs"),
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52 null,
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53 null,
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54 new FPInstructionDecoder("ftst"),
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55 new FPInstructionDecoder("fxam"),
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56 null,
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57 null
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58 },
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59 /* d9_5 */
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60 {
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61 new FPInstructionDecoder("fld1"),
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62 new FPInstructionDecoder("fldl2t"),
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63 new FPInstructionDecoder("fldl2e"),
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64 new FPInstructionDecoder("fldpi"),
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65 new FPInstructionDecoder("fldlg2"),
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66 new FPInstructionDecoder("fldln2"),
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67 new FPInstructionDecoder("fldz"),
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68 null
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69 },
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70 /* d9_6 */
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71 {
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72 new FPInstructionDecoder("f2xm1"),
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73 new FPInstructionDecoder("fyl2x"),
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74 new FPInstructionDecoder("fptan"),
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75 new FPInstructionDecoder("fpatan"),
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76 new FPInstructionDecoder("fxtract"),
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77 new FPInstructionDecoder("fprem1"),
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78 new FPInstructionDecoder("fdecstp"),
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79 new FPInstructionDecoder("fincstp")
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80 },
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81 /* d9_7 */
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82 {
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83 new FPInstructionDecoder("fprem"),
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84 new FPInstructionDecoder("fyl2xp1"),
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85 new FPInstructionDecoder("fsqrt"),
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86 new FPInstructionDecoder("fsincos"),
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87 new FPInstructionDecoder("frndint"),
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88 new FPInstructionDecoder("fscale"),
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89 new FPInstructionDecoder("fsin"),
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90 new FPInstructionDecoder("fcos")
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91 },
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92 /* da_5 */
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93 {
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94 null,
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95 new FPInstructionDecoder("fucompp"),
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96 null,
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97 null,
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98 null,
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99 null,
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100 null,
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101 null
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102 },
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103 /* db_4 */
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104 {
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105 new FPInstructionDecoder("feni(287 only)"),
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106 new FPInstructionDecoder("fdisi(287 only)"),
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107 new FPInstructionDecoder("fNclex"),
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108 new FPInstructionDecoder("fNinit"),
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109 new FPInstructionDecoder("fNsetpm(287 only)"),
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110 null,
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111 null,
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112 null
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113 },
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114 /* de_3 */
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115 {
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116 null,
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117 new FPInstructionDecoder("fcompp"),
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118 null,
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119 null,
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120 null,
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121 null,
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122 null,
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123 null
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124 },
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125 /* df_4 */
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126 {
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127 new FPInstructionDecoder("fNstsw"),
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128 null,
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129 null,
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130 null,
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131 null,
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132 null,
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133 null,
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134 null
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135 }
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136 };
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137
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138 public FloatGRPDecoder(String name, int number) {
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139 super(name);
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140 this.number = number;
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141 }
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142
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143 public Instruction decode(byte[] bytesArray, int index, int instrStartIndex, int segmentOverride, int prefixes, X86InstructionFactory factory) {
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144 this.byteIndex = index;
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145 this.instrStartIndex = instrStartIndex;
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146 this.prefixes = prefixes;
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147
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148 int ModRM = readByte(bytesArray, byteIndex);
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149 int rm = ModRM & 7;
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150
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151 FPInstructionDecoder instrDecoder = null;
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152 instrDecoder = floatGRPMap[number][rm];
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153
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154 Instruction instr = null;
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155 if(instrDecoder != null) {
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156 instr = instrDecoder.decode(bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);
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157 byteIndex = instrDecoder.getCurrentIndex();
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158 } else {
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159 instr = factory.newIllegalInstruction();
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160 }
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161 return instr;
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162 }
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163 }
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