| /* |
| * Copyright 2002 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.sparc; |
| |
| import sun.jvm.hotspot.asm.*; |
| |
| class V9WriteDecoder extends InstructionDecoder |
| implements V9InstructionDecoder { |
| Instruction decode(int instruction, SPARCInstructionFactory factory) { |
| SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory; |
| Instruction instr = null; |
| int specialRegNum = getDestinationRegister(instruction); |
| |
| // rd values 1, 4,5 7-14 are reserved - see page 244, A.63 Write State Register. |
| if (specialRegNum == 1 || specialRegNum == 4 || specialRegNum == 5 |
| || (specialRegNum > 6 && specialRegNum < 15)) { |
| instr = v9factory.newIllegalInstruction(instruction); |
| } else { |
| int rs1Num = getSourceRegister1(instruction); |
| if (specialRegNum == 15) { |
| if (isIBitSet(instruction) && rs1Num == 0) { |
| instr = v9factory.newV9SirInstruction(); |
| } else { |
| instr = v9factory.newIllegalInstruction(instruction); |
| } |
| } else { |
| int asrRegNum = -1; |
| if (specialRegNum > 15) { |
| asrRegNum = specialRegNum; |
| specialRegNum = SPARCV9SpecialRegisters.ASR; |
| } |
| SPARCRegister rs1 = SPARCRegisters.getRegister(rs1Num); |
| instr = v9factory.newV9WriteInstruction(specialRegNum, asrRegNum, rs1, getOperand2(instruction)); |
| } |
| } |
| |
| return instr; |
| } |
| } |