1 /*

     2  * Copyright (c) 2002, 2003, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 package sun.jvm.hotspot.asm.x86;

    26 

    27 import sun.jvm.hotspot.asm.*;

    28 

    29 public class FloatGRPDecoder extends FPInstructionDecoder {

    30 

    31    final private int number;

    32 

    33    //Please refer to IA-32 Intel Architecture Software Developer's Manual Volume 2

    34    //APPENDIX A - Escape opcodes

    35 

    36    private static final FPInstructionDecoder floatGRPMap[][] = {

    37       /* d9_2 */

    38       {

    39       new FPInstructionDecoder("fnop"),

    40       null,

    41       null,

    42       null,

    43       null,

    44       null,

    45       null,

    46       null

    47       },

    48       /*  d9_4 */

    49       {

    50       new FPInstructionDecoder("fchs"),

    51       new FPInstructionDecoder("fabs"),

    52       null,

    53       null,

    54       new FPInstructionDecoder("ftst"),

    55       new FPInstructionDecoder("fxam"),

    56       null,

    57       null

    58       },

    59       /* d9_5 */

    60       {

    61       new FPInstructionDecoder("fld1"),

    62       new FPInstructionDecoder("fldl2t"),

    63       new FPInstructionDecoder("fldl2e"),

    64       new FPInstructionDecoder("fldpi"),

    65       new FPInstructionDecoder("fldlg2"),

    66       new FPInstructionDecoder("fldln2"),

    67       new FPInstructionDecoder("fldz"),

    68       null

    69       },

    70       /* d9_6 */

    71       {

    72       new FPInstructionDecoder("f2xm1"),

    73       new FPInstructionDecoder("fyl2x"),

    74       new FPInstructionDecoder("fptan"),

    75       new FPInstructionDecoder("fpatan"),

    76       new FPInstructionDecoder("fxtract"),

    77       new FPInstructionDecoder("fprem1"),

    78       new FPInstructionDecoder("fdecstp"),

    79       new FPInstructionDecoder("fincstp")

    80       },

    81       /* d9_7 */

    82       {

    83       new FPInstructionDecoder("fprem"),

    84       new FPInstructionDecoder("fyl2xp1"),

    85       new FPInstructionDecoder("fsqrt"),

    86       new FPInstructionDecoder("fsincos"),

    87       new FPInstructionDecoder("frndint"),

    88       new FPInstructionDecoder("fscale"),

    89       new FPInstructionDecoder("fsin"),

    90       new FPInstructionDecoder("fcos")

    91       },

    92       /* da_5 */

    93       {

    94       null,

    95       new FPInstructionDecoder("fucompp"),

    96       null,

    97       null,

    98       null,

    99       null,

   100       null,

   101       null

   102       },

   103       /* db_4 */

   104       {

   105       new FPInstructionDecoder("feni(287 only)"),

   106       new FPInstructionDecoder("fdisi(287 only)"),

   107       new FPInstructionDecoder("fNclex"),

   108       new FPInstructionDecoder("fNinit"),

   109       new FPInstructionDecoder("fNsetpm(287 only)"),

   110       null,

   111       null,

   112       null

   113       },

   114       /* de_3 */

   115       {

   116       null,

   117       new FPInstructionDecoder("fcompp"),

   118       null,

   119       null,

   120       null,

   121       null,

   122       null,

   123       null

   124       },

   125       /* df_4 */

   126       {

   127       new FPInstructionDecoder("fNstsw"),

   128       null,

   129       null,

   130       null,

   131       null,

   132       null,

   133       null,

   134       null

   135       }

   136    };

   137 

   138    public FloatGRPDecoder(String name, int number) {

   139       super(name);

   140       this.number = number;

   141    }

   142 

   143    public Instruction decode(byte[] bytesArray, int index, int instrStartIndex, int segmentOverride, int prefixes, X86InstructionFactory factory) {

   144       this.byteIndex = index;

   145       this.instrStartIndex = instrStartIndex;

   146       this.prefixes = prefixes;

   147 

   148       int ModRM = readByte(bytesArray, byteIndex);

   149       int rm = ModRM & 7;

   150 

   151       FPInstructionDecoder instrDecoder = null;

   152       instrDecoder = floatGRPMap[number][rm];

   153 

   154       Instruction instr = null;

   155       if(instrDecoder != null) {

   156          instr = instrDecoder.decode(bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);

   157          byteIndex = instrDecoder.getCurrentIndex();

   158       } else {

   159          instr = factory.newIllegalInstruction();

   160       }

   161       return instr;

   162    }

   163 }