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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 ReadDecoder extends ReadWriteDecoder {
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30 ReadDecoder(int specialRegNum) {
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31 super(specialRegNum);
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32 }
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33
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34 Instruction decodeReadWrite(int instruction, SPARCInstructionFactory factory,
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35 int rs1Num, int rdNum) {
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36 Instruction instr = null;
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37 int specialReg = specialRegNum;
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38 if (rs1Num == 0)
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39 specialReg = SPARCSpecialRegisters.Y;
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40 if (rs1Num == 15 && rdNum == 0) {
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41 instr = factory.newStbarInstruction();
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42 } else {
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43 instr = factory.newReadInstruction(specialReg, rs1Num,
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44 SPARCRegisters.getRegister(rdNum));
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45 }
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46 return instr;
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47 }
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48 }
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