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 JmplDecoder extends MemoryInstructionDecoder {
  30     JmplDecoder() {
  31         super(JMPL, "jmpl", RTLDT_UNSIGNED_WORD);
  32     }
  33 
  34     Instruction decodeMemoryInstruction(int instruction, SPARCRegisterIndirectAddress addr,
  35                        SPARCRegister rd,  SPARCInstructionFactory factory) {
  36         // this may be most probably indirect call or ret or retl
  37         Instruction instr = null;
  38         if (rd == SPARCRegisters.O7) {
  39             instr = factory.newIndirectCallInstruction(addr, rd);
  40         } else if (rd == SPARCRegisters.G0) {
  41             int disp = (int) addr.getDisplacement();
  42             Register base = addr.getBase();
  43             if (base == SPARCRegisters.I7 && disp == 8) {
  44                 instr = factory.newReturnInstruction(addr, rd, false /* not leaf */);
  45             } else if (base == SPARCRegisters.O7 && disp == 8) {
  46                 instr = factory.newReturnInstruction(addr, rd, true /* leaf */);
  47             } else {
  48                 instr = factory.newJmplInstruction(addr, rd);
  49             }
  50         } else {
  51             instr = factory.newJmplInstruction(addr, rd);
  52         }
  53         return instr;
  54     }
  55 }