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1 /*
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2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.asm.sparc;
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26
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27 import sun.jvm.hotspot.asm.*;
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28
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29 class V9WriteDecoder extends InstructionDecoder
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30 implements V9InstructionDecoder {
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31 Instruction decode(int instruction, SPARCInstructionFactory factory) {
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32 SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory;
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33 Instruction instr = null;
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34 int specialRegNum = getDestinationRegister(instruction);
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35
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36 // rd values 1, 4,5 7-14 are reserved - see page 244, A.63 Write State Register.
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37 if (specialRegNum == 1 || specialRegNum == 4 || specialRegNum == 5
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38 || (specialRegNum > 6 && specialRegNum < 15)) {
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39 instr = v9factory.newIllegalInstruction(instruction);
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40 } else {
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41 int rs1Num = getSourceRegister1(instruction);
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42 if (specialRegNum == 15) {
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43 if (isIBitSet(instruction) && rs1Num == 0) {
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44 instr = v9factory.newV9SirInstruction();
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45 } else {
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46 instr = v9factory.newIllegalInstruction(instruction);
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47 }
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48 } else {
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49 int asrRegNum = -1;
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50 if (specialRegNum > 15) {
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51 asrRegNum = specialRegNum;
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52 specialRegNum = SPARCV9SpecialRegisters.ASR;
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53 }
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54 SPARCRegister rs1 = SPARCRegisters.getRegister(rs1Num);
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55 instr = v9factory.newV9WriteInstruction(specialRegNum, asrRegNum, rs1, getOperand2(instruction));
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56 }
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57 }
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58
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59 return instr;
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60 }
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61 }
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