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,
  20  * CA 94065 USA or visit www.oracle.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 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 }