1 /*

     2  * Copyright (c) 2002, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 package sun.jvm.hotspot.asm.sparc;

    26 

    27 import sun.jvm.hotspot.asm.*;

    28 

    29 class ReadDecoder extends ReadWriteDecoder {

    30     ReadDecoder(int specialRegNum) {

    31         super(specialRegNum);

    32     }

    33 

    34     Instruction decodeReadWrite(int instruction, SPARCInstructionFactory factory,

    35                                 int rs1Num, int rdNum) {

    36         Instruction instr = null;

    37         int specialReg = specialRegNum;

    38         if (rs1Num == 0)

    39             specialReg = SPARCSpecialRegisters.Y;

    40         if (rs1Num == 15 && rdNum == 0) {

    41             instr = factory.newStbarInstruction();

    42         } else {

    43             instr = factory.newReadInstruction(specialReg, rs1Num,

    44                                   SPARCRegisters.getRegister(rdNum));

    45         }

    46         return instr;

    47     }

    48 }