1 /* 2 * Copyright 2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.asm.sparc; 26 27 import sun.jvm.hotspot.asm.*; 28 29 class V9WriteDecoder extends InstructionDecoder 30 implements V9InstructionDecoder { 31 Instruction decode(int instruction, SPARCInstructionFactory factory) { 32 SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory; 33 Instruction instr = null; 34 int specialRegNum = getDestinationRegister(instruction); 35 36 // rd values 1, 4,5 7-14 are reserved - see page 244, A.63 Write State Register. 37 if (specialRegNum == 1 || specialRegNum == 4 || specialRegNum == 5 38 || (specialRegNum > 6 && specialRegNum < 15)) { 39 instr = v9factory.newIllegalInstruction(instruction); 40 } else { 41 int rs1Num = getSourceRegister1(instruction); 42 if (specialRegNum == 15) { 43 if (isIBitSet(instruction) && rs1Num == 0) { 44 instr = v9factory.newV9SirInstruction(); 45 } else { 46 instr = v9factory.newIllegalInstruction(instruction); 47 } 48 } else { 49 int asrRegNum = -1; 50 if (specialRegNum > 15) { 51 asrRegNum = specialRegNum; 52 specialRegNum = SPARCV9SpecialRegisters.ASR; 53 } 54 SPARCRegister rs1 = SPARCRegisters.getRegister(rs1Num); 55 instr = v9factory.newV9WriteInstruction(specialRegNum, asrRegNum, rs1, getOperand2(instruction)); 56 } 57 } 58 59 return instr; 60 } 61 }