| /* |
| * 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. |
| * |
| */ |
| |
| package sun.jvm.hotspot.asm.x86; |
| |
| import sun.jvm.hotspot.asm.*; |
| |
| 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, v_mode, RTLOP_ADD), |
| new FPArithmeticDecoder("fmuls", ADDR_E, v_mode, RTLOP_SMUL), |
| new FPInstructionDecoder("fcoms", ADDR_E, v_mode), |
| new FPInstructionDecoder("fcomps", ADDR_E, v_mode), |
| new FPArithmeticDecoder("fsubs", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fsubrs", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fdivs", ADDR_E, v_mode, RTLOP_SDIV), |
| new FPArithmeticDecoder("fdivrs", ADDR_E, v_mode, RTLOP_SDIV) |
| }, |
| /* d9 */ |
| { |
| new FPLoadDecoder("flds", ADDR_E, v_mode), |
| null, |
| new FPStoreDecoder("fsts", ADDR_E, v_mode), |
| new FPStoreDecoder("fstps", ADDR_E, v_mode), |
| new FPStoreDecoder("fldenv", ADDR_E, v_mode), |
| new FPStoreDecoder("fldcw", ADDR_E, v_mode), |
| new FPStoreDecoder("fNstenv", ADDR_E, v_mode), |
| new FPStoreDecoder("fNstcw", ADDR_E, v_mode) |
| }, |
| /* da */ |
| { |
| new FPArithmeticDecoder("fiaddl", ADDR_E, v_mode, RTLOP_ADD), |
| new FPArithmeticDecoder("fimull", ADDR_E, v_mode, RTLOP_SMUL), |
| new FPInstructionDecoder("ficoml", ADDR_E, v_mode), |
| new FPInstructionDecoder("ficompl", ADDR_E, v_mode), |
| new FPArithmeticDecoder("fisubl", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fisubrl", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fidivl", ADDR_E, v_mode, RTLOP_SDIV), |
| new FPArithmeticDecoder("fidivrl", ADDR_E, v_mode, RTLOP_SDIV) |
| }, |
| /* db */ |
| { |
| new FPLoadDecoder("fildl", ADDR_E, v_mode), |
| null, |
| new FPStoreDecoder("fistl", ADDR_E, v_mode), |
| new FPStoreDecoder("fistpl", ADDR_E, v_mode), |
| null, |
| new FPLoadDecoder("fldt", ADDR_E, v_mode), |
| null, |
| new FPStoreDecoder("fstpt", ADDR_E, v_mode) |
| }, |
| /* dc */ |
| { |
| new FPArithmeticDecoder("faddl", ADDR_E, v_mode, RTLOP_ADD), |
| new FPArithmeticDecoder("fmull", ADDR_E, v_mode, RTLOP_SMUL), |
| new FPInstructionDecoder("fcoml", ADDR_E, v_mode), |
| new FPInstructionDecoder("fcompl", ADDR_E, v_mode), |
| new FPArithmeticDecoder("fsubl", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fsubrl", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fdivl", ADDR_E, v_mode, RTLOP_SDIV), |
| new FPArithmeticDecoder("fdivrl", ADDR_E, v_mode, RTLOP_SDIV) |
| }, |
| /* dd */ |
| { |
| new FPLoadDecoder("fldl", ADDR_E, v_mode), |
| null, |
| new FPStoreDecoder("fstl", ADDR_E, v_mode), |
| new FPStoreDecoder("fstpl", ADDR_E, v_mode), |
| new FPStoreDecoder("frstor", ADDR_E, v_mode), |
| null, |
| new FPStoreDecoder("fNsave", ADDR_E, v_mode), |
| new FPStoreDecoder("fNstsw", ADDR_E, v_mode) |
| }, |
| /* de */ |
| { |
| new FPArithmeticDecoder("fiadd", ADDR_E, v_mode, RTLOP_ADD), |
| new FPArithmeticDecoder("fimul", ADDR_E, v_mode, RTLOP_SMUL), |
| new FPInstructionDecoder("ficom", ADDR_E, v_mode), |
| new FPInstructionDecoder("ficomp", ADDR_E, v_mode), |
| new FPArithmeticDecoder("fisub", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fisubr", ADDR_E, v_mode, RTLOP_SUB), |
| new FPArithmeticDecoder("fidiv", ADDR_E, v_mode, RTLOP_SDIV), |
| new FPArithmeticDecoder("fidivr", ADDR_E, v_mode, RTLOP_SDIV) |
| }, |
| /* df */ |
| { |
| new FPLoadDecoder("fild", ADDR_E, v_mode), |
| null, |
| new FPStoreDecoder("fist", ADDR_E, v_mode), |
| new FPStoreDecoder("fistp", ADDR_E, v_mode), |
| new FPLoadDecoder("fbld", ADDR_E, v_mode), |
| new FPLoadDecoder("fildll", ADDR_E, v_mode), |
| new FPStoreDecoder("fbstp", ADDR_E, v_mode), |
| new FPStoreDecoder("fistpll", ADDR_E, v_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, RTLOP_ADD), |
| new FPArithmeticDecoder("fmul", ADDR_FPREG, 0, ADDR_FPREG, 1, RTLOP_SMUL), |
| new FPInstructionDecoder("fcom", ADDR_FPREG, 1), |
| new FPInstructionDecoder("fcomp", ADDR_FPREG, 1), |
| new FPArithmeticDecoder("fsub", ADDR_FPREG, 0, ADDR_FPREG, 1, RTLOP_SUB), |
| new FPArithmeticDecoder("fsubr", ADDR_FPREG, 0, ADDR_FPREG, 1, RTLOP_SUB), |
| new FPArithmeticDecoder("fdiv", ADDR_FPREG, 0, ADDR_FPREG, 1, RTLOP_SDIV), |
| new FPArithmeticDecoder("fdivr", ADDR_FPREG, 0, ADDR_FPREG, 1, RTLOP_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, RTLOP_ADD), |
| new FPArithmeticDecoder("fmul", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SMUL), |
| null, |
| null, |
| new FPArithmeticDecoder("fsub", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SUB), |
| new FPArithmeticDecoder("fsubr",ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SUB), |
| new FPArithmeticDecoder("fdiv", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SDIV), |
| new FPArithmeticDecoder("fdivr", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_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, RTLOP_ADD), |
| new FPArithmeticDecoder("fmulp", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SMUL), |
| null, |
| new FloatGRPDecoder(null, 7), |
| new FPArithmeticDecoder("fsubrp", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SUB), |
| new FPArithmeticDecoder("fsubp", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SUB), |
| new FPArithmeticDecoder("fdivrp", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SDIV), |
| new FPArithmeticDecoder("fdivp", ADDR_FPREG, 1, ADDR_FPREG, 0, RTLOP_SDIV) |
| }, |
| /* df */ |
| { |
| null, |
| null, |
| null, |
| null, |
| new FloatGRPDecoder(null, 7), |
| null, |
| null, |
| null |
| } |
| }; |
| |
| public Instruction decode(byte[] 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 floatOpcode = InstructionDecoder.readByte(bytesArray, instrStartIndex); |
| 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(); |
| } else { |
| instr = factory.newIllegalInstruction(); |
| } |
| return instr; |
| } |
| } |
