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 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 }