/*
* 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.Operation;
import org.jakstab.asm.x86.X86InstructionFactory;
import org.jakstab.util.BinaryInputBuffer;
public class FloatDecoder extends FPInstructionDecoder {
public FloatDecoder() {
super(null);
}
//Please refer to IA-32 Intel Architecture Software Developer's Manual Volume 2
//APPENDIX A - Escape opcodes
/*When ModR/M byte is within 00h to BFh*/
private static final FPInstructionDecoder floatMapOne[][] = {
/* d8 */
{
new FPArithmeticDecoder("fadds", ADDR_E, fs_mode, Operation.ADD),
new FPArithmeticDecoder("fmuls", ADDR_E, fs_mode, Operation.SMUL),
new FPInstructionDecoder("fcoms", ADDR_E, fs_mode),
new FPInstructionDecoder("fcomps", ADDR_E, fs_mode),
new FPArithmeticDecoder("fsubs", ADDR_E, fs_mode, Operation.SUB),
new FPArithmeticDecoder("fsubrs", ADDR_E, fs_mode, Operation.SUB),
new FPArithmeticDecoder("fdivs", ADDR_E, fs_mode, Operation.SDIV),
new FPArithmeticDecoder("fdivrs", ADDR_E, fs_mode, Operation.SDIV)
},
/* d9 */
{
new FPLoadDecoder("flds", ADDR_E, fs_mode),
null,
new FPStoreDecoder("fsts", ADDR_E, fs_mode),
new FPStoreDecoder("fstps", ADDR_E, fs_mode),
new FPStoreDecoder("fldenv", ADDR_E, v_mode),
new FPStoreDecoder("fldcw", ADDR_E, w_mode),
new FPStoreDecoder("fNstenv", ADDR_E, b_mode),
new FPStoreDecoder("fNstcw", ADDR_E, w_mode)
},
/* da */
{
new FPArithmeticDecoder("fiaddl", ADDR_E, d_mode, Operation.ADD),
new FPArithmeticDecoder("fimull", ADDR_E, d_mode, Operation.SMUL),
new FPInstructionDecoder("ficoml", ADDR_E, d_mode),
new FPInstructionDecoder("ficompl", ADDR_E, d_mode),
new FPArithmeticDecoder("fisubl", ADDR_E, d_mode, Operation.SUB),
new FPArithmeticDecoder("fisubrl", ADDR_E, d_mode, Operation.SUB),
new FPArithmeticDecoder("fidivl", ADDR_E, d_mode, Operation.SDIV),
new FPArithmeticDecoder("fidivrl", ADDR_E, d_mode, Operation.SDIV)
},
/* db */
{
new FPLoadDecoder("fildl", ADDR_E, d_mode),
null,
new FPStoreDecoder("fistl", ADDR_E, d_mode),
new FPStoreDecoder("fistpl", ADDR_E, d_mode),
null,
new FPLoadDecoder("fldt", ADDR_E, fe_mode),
null,
new FPStoreDecoder("fstpt", ADDR_E, fe_mode)
},
/* dc */
{
new FPArithmeticDecoder("faddl", ADDR_E, fd_mode, Operation.ADD),
new FPArithmeticDecoder("fmull", ADDR_E, fd_mode, Operation.SMUL),
new FPInstructionDecoder("fcoml", ADDR_E, fd_mode),
new FPInstructionDecoder("fcompl", ADDR_E, fd_mode),
new FPArithmeticDecoder("fsubl", ADDR_E, fd_mode, Operation.SUB),
new FPArithmeticDecoder("fsubrl", ADDR_E, fd_mode, Operation.SUB),
new FPArithmeticDecoder("fdivl", ADDR_E, fd_mode, Operation.SDIV),
new FPArithmeticDecoder("fdivrl", ADDR_E, fd_mode, Operation.SDIV)
},
/* dd */
{
new FPLoadDecoder("fldl", ADDR_E, fd_mode),
null,
new FPStoreDecoder("fstl", ADDR_E, fd_mode),
new FPStoreDecoder("fstpl", ADDR_E, fd_mode),
new FPStoreDecoder("frstor", ADDR_E, v_mode),
null,
new FPStoreDecoder("fNsave", ADDR_E, w_mode),
new FPStoreDecoder("fNstsw", ADDR_E, w_mode)
},
/* de */
{
new FPArithmeticDecoder("fiadd", ADDR_E, w_mode, Operation.ADD),
new FPArithmeticDecoder("fimul", ADDR_E, w_mode, Operation.SMUL),
new FPInstructionDecoder("ficom", ADDR_E, w_mode),
new FPInstructionDecoder("ficomp", ADDR_E, w_mode),
new FPArithmeticDecoder("fisub", ADDR_E, w_mode, Operation.SUB),
new FPArithmeticDecoder("fisubr", ADDR_E, w_mode, Operation.SUB),
new FPArithmeticDecoder("fidiv", ADDR_E, w_mode, Operation.SDIV),
new FPArithmeticDecoder("fidivr", ADDR_E, w_mode, Operation.SDIV)
},
/* df */
{
new FPLoadDecoder("fild", ADDR_E, w_mode),
null,
new FPStoreDecoder("fist", ADDR_E, w_mode),
new FPStoreDecoder("fistp", ADDR_E, w_mode),
new FPLoadDecoder("fbld", ADDR_E, v_mode),
new FPLoadDecoder("fildll", ADDR_E, q_mode),
new FPStoreDecoder("fbstp", ADDR_E, v_mode),
new FPStoreDecoder("fistpll", ADDR_E, q_mode)
}
};
/*When ModR/M byte is outside 00h to BFh*/
private static final FPInstructionDecoder floatMapTwo[][] = {
/* d8 */
/*parameter for ADDR_FPREG, 0 means ST(0), 1 means ST at rm value. */
{
new FPArithmeticDecoder("fadd", ADDR_FPREG, 0, ADDR_FPREG, 1, Operation.ADD),
new FPArithmeticDecoder("fmul", ADDR_FPREG, 0, ADDR_FPREG, 1, Operation.SMUL),
new FPInstructionDecoder("fcom", ADDR_FPREG, 1),
new FPInstructionDecoder("fcomp", ADDR_FPREG, 1),
new FPArithmeticDecoder("fsub", ADDR_FPREG, 0, ADDR_FPREG, 1, Operation.SUB),
new FPArithmeticDecoder("fsubr", ADDR_FPREG, 0, ADDR_FPREG, 1, Operation.SUB),
new FPArithmeticDecoder("fdiv", ADDR_FPREG, 0, ADDR_FPREG, 1, Operation.SDIV),
new FPArithmeticDecoder("fdivr", ADDR_FPREG, 0, ADDR_FPREG, 1, Operation.SDIV)
},
/* d9 */
{
new FPLoadDecoder("fld", ADDR_FPREG, 1),
new FPInstructionDecoder("fxch", ADDR_FPREG, 1),
new FloatGRPDecoder(null, 0),
null,
new FloatGRPDecoder(null, 1),
new FloatGRPDecoder(null, 2),
new FloatGRPDecoder(null, 3),
new FloatGRPDecoder(null, 4)
},
/* da */
{
null,
null,
null,
null,
null,
new FloatGRPDecoder(null, 5),
null,
null
},
/* db */
{
null,
null,
null,
null,
new FloatGRPDecoder(null, 6),
null,
null,
null
},
/* dc */
{
new FPArithmeticDecoder("fadd", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.ADD),
new FPArithmeticDecoder("fmul", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SMUL),
null,
null,
new FPArithmeticDecoder("fsub", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SUB),
new FPArithmeticDecoder("fsubr",ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SUB),
new FPArithmeticDecoder("fdiv", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SDIV),
new FPArithmeticDecoder("fdivr", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SDIV)
},
/* dd */
{
new FPInstructionDecoder("ffree", ADDR_FPREG, 1),
null,
new FPStoreDecoder("fst", ADDR_FPREG, 1),
new FPStoreDecoder("fstp", ADDR_FPREG, 1),
new FPInstructionDecoder("fucom", ADDR_FPREG, 1),
new FPInstructionDecoder("fucomp", ADDR_FPREG, 1),
null,
null
},
/* de */
{
new FPArithmeticDecoder("faddp", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.ADD),
new FPArithmeticDecoder("fmulp", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SMUL),
null,
new FloatGRPDecoder(null, 7),
new FPArithmeticDecoder("fsubrp", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SUB),
new FPArithmeticDecoder("fsubp", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SUB),
new FPArithmeticDecoder("fdivrp", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SDIV),
new FPArithmeticDecoder("fdivp", ADDR_FPREG, 1, ADDR_FPREG, 0, Operation.SDIV)
},
/* df */
{
null,
null,
null,
null,
new FloatGRPDecoder(null, 8),
null,
null,
null
}
};
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 reg = (ModRM >> 3) & 7;
// int regOrOpcode = (ModRM >> 3) & 7;
// int rm = ModRM & 7;
int startIndexWithoutPrefix;
// JK: FWAIT was broken
if ((prefixes & PREFIX_FWAIT) != 0)
startIndexWithoutPrefix = instrStartIndex + 1;
else
startIndexWithoutPrefix = instrStartIndex;
int floatOpcode = InstructionDecoder.readByte(bytesArray, startIndexWithoutPrefix);
FPInstructionDecoder instrDecoder = null;
if(ModRM < 0xbf) {
instrDecoder = floatMapOne[floatOpcode - 0xd8][reg];
}
else {
instrDecoder = floatMapTwo[floatOpcode - 0xd8][reg];
}
Instruction instr = null;
if(instrDecoder != null) {
instr = instrDecoder.decode(bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);
byteIndex = instrDecoder.getCurrentIndex();
}
return instr;
}
}