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 abstract class MemoryInstructionDecoder extends InstructionDecoder {

    30     final int    op3;

    31     final String name;

    32     final int    dataType;

    33 

    34     SPARCRegisterIndirectAddress newRegisterIndirectAddress(SPARCRegister rs1, SPARCRegister rs2) {

    35         return new SPARCRegisterIndirectAddress(rs1, rs2);

    36     }

    37 

    38     SPARCRegisterIndirectAddress newRegisterIndirectAddress(SPARCRegister rs1, int offset) {

    39         return new SPARCRegisterIndirectAddress(rs1, offset);

    40     }

    41 

    42     static void setAddressSpace(int instruction, SPARCRegisterIndirectAddress addr) {

    43         int asi = (instruction & ASI_MASK) >>> ASI_START_BIT;

    44         addr.setAddressSpace(asi);

    45     }

    46 

    47     SPARCRegisterIndirectAddress getRegisterIndirectAddress(int instruction) {

    48         SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction));

    49         boolean iBit = isIBitSet(instruction);

    50         SPARCRegisterIndirectAddress addr = null;

    51         if (iBit) {

    52             int simm13 = extractSignedIntFromNBits(instruction, 13);

    53             addr = newRegisterIndirectAddress(rs1,simm13);

    54         } else {

    55             SPARCRegister rs2 = SPARCRegisters.getRegister(getSourceRegister2(instruction));

    56             addr = newRegisterIndirectAddress(rs1,rs2);

    57         }

    58         return addr;

    59     }

    60 

    61     MemoryInstructionDecoder(int op3, String name, int dataType) {

    62         this.op3 = op3;

    63         this.name = name;

    64         this.dataType = dataType;

    65     }

    66 

    67     Instruction decode(int instruction, SPARCInstructionFactory factory) {

    68         SPARCRegisterIndirectAddress addr = getRegisterIndirectAddress(instruction);

    69         SPARCRegister rd = getDestination(instruction);

    70         boolean isV9Okay = (factory instanceof SPARCV9InstructionFactory);

    71         if ( (rd == null) || (! isV9Okay && rd.isV9Only()) )

    72             return factory.newIllegalInstruction(instruction);

    73 

    74         return decodeMemoryInstruction(instruction, addr, rd, factory);

    75     }

    76 

    77     SPARCRegister getDestination(int instruction) {

    78         int rdNum = getDestinationRegister(instruction);

    79         SPARCRegister rd = RegisterDecoder.decode(dataType, rdNum);

    80         return rd;

    81     }

    82 

    83     abstract Instruction decodeMemoryInstruction(int instruction,

    84                                    SPARCRegisterIndirectAddress addr,

    85                                    SPARCRegister rd, SPARCInstructionFactory factory);

    86 }