/*
* Copyright 2002-2003 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
/*
* Original code for this class taken from the Java HotSpot VM.
* Modified for use with the Jakstab project. All modifications
* Copyright 2007-2012 Johannes Kinder <jk@jakstab.org>
*/
package org.jakstab.disasm.x86;
import org.jakstab.asm.Instruction;
import org.jakstab.asm.x86.X86InstructionFactory;
import org.jakstab.util.BinaryInputBuffer;
import org.jakstab.util.Logger;
public class FloatGRPDecoder extends FPInstructionDecoder {
@SuppressWarnings("unused")
private final static Logger logger = Logger.getLogger(FloatGRPDecoder.class);
final private int number;
//Please refer to IA-32 Intel Architecture Software Developer's Manual Volume 2
//APPENDIX A - Escape opcodes
private static final FPInstructionDecoder floatGRPMap[][] = {
/* d9_2 */
{
new FPInstructionDecoder("fnop"),
null,
null,
null,
null,
null,
null,
null
},
/* d9_4 */
{
new FPInstructionDecoder("fchs"),
new FPInstructionDecoder("fabs"),
null,
null,
new FPInstructionDecoder("ftst"),
new FPInstructionDecoder("fxam"),
null,
null
},
/* d9_5 */
{
new FPInstructionDecoder("fld1"),
new FPInstructionDecoder("fldl2t"),
new FPInstructionDecoder("fldl2e"),
new FPInstructionDecoder("fldpi"),
new FPInstructionDecoder("fldlg2"),
new FPInstructionDecoder("fldln2"),
new FPInstructionDecoder("fldz"),
null
},
/* d9_6 */
{
new FPInstructionDecoder("f2xm1"),
new FPInstructionDecoder("fyl2x"),
new FPInstructionDecoder("fptan"),
new FPInstructionDecoder("fpatan"),
new FPInstructionDecoder("fxtract"),
new FPInstructionDecoder("fprem1"),
new FPInstructionDecoder("fdecstp"),
new FPInstructionDecoder("fincstp")
},
/* d9_7 */
{
new FPInstructionDecoder("fprem"),
new FPInstructionDecoder("fyl2xp1"),
new FPInstructionDecoder("fsqrt"),
new FPInstructionDecoder("fsincos"),
new FPInstructionDecoder("frndint"),
new FPInstructionDecoder("fscale"),
new FPInstructionDecoder("fsin"),
new FPInstructionDecoder("fcos")
},
/* da_5 */
{
null,
new FPInstructionDecoder("fucompp", ADDR_FPREG, 1),
null,
null,
null,
null,
null,
null
},
/* db_4 */
{
new FPInstructionDecoder("feni(287 only)"),
new FPInstructionDecoder("fdisi(287 only)"),
new FPInstructionDecoder("fNclex"),
new FPInstructionDecoder("fNinit"),
new FPInstructionDecoder("fNsetpm(287 only)"),
null,
null,
null
},
/* de_3 */
{
null,
new FPInstructionDecoder("fcompp"),
null,
null,
null,
null,
null,
null
},
/* df_4 */
{
new FPInstructionDecoder("fNstsw", ADDR_REG, AX),
null,
null,
null,
null,
null,
null,
null
}
};
public FloatGRPDecoder(String name, int number) {
super(name);
this.number = number;
}
public Instruction decode(BinaryInputBuffer bytesArray, int index, int instrStartIndex, int segmentOverride, int prefixes, X86InstructionFactory factory) {
this.byteIndex = index;
this.instrStartIndex = instrStartIndex;
this.prefixes = prefixes;
int ModRM = readByte(bytesArray, byteIndex);
int rm = ModRM & 7;
FPInstructionDecoder instrDecoder = null;
instrDecoder = floatGRPMap[number][rm];
Instruction instr = null;
if(instrDecoder != null) {
instr = instrDecoder.decode(bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);
byteIndex = instrDecoder.getCurrentIndex();
}
return instr;
}
}