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1 /*
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2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.asm.sparc;
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26
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27 import sun.jvm.hotspot.asm.*;
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28
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29 abstract class V9RegisterBranchDecoder extends V9BranchDecoder {
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30 static int getDisp16(int instruction) {
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31 int offset = (DISP_16_LO_MASK & instruction) |
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32 ((DISP_16_HI_MASK & instruction) >>> (DISP_16_HI_START_BIT - DISP_16_LO_NUMBITS));
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33
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34 // sign extend and word align
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35 offset = extractSignedIntFromNBits(offset, 16);
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36 offset <<= 2;
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37
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38 return offset;
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39 }
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40
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41 String getConditionName(int conditionCode, boolean isAnnuled) {
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42 return null;
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43 }
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44
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45 abstract String getRegisterConditionName(int rcond);
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46
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47 public Instruction decode(int instruction, SPARCInstructionFactory factory) {
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48 SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory;
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49 int rcond = (BRANCH_RCOND_MASK & instruction) >>> BRANCH_RCOND_START_BIT;
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50 if (rcond == BRANCH_RCOND_RESERVED1 || rcond == BRANCH_RCOND_RESERVED2)
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51 return factory.newIllegalInstruction(instruction);
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52
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53 SPARCRegister rs1 = SPARCRegisters.getRegister(getSourceRegister1(instruction));
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54 boolean predictTaken = getPredictTaken(instruction);
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55 boolean annuled = getAnnuledBit(instruction);
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56 PCRelativeAddress addr = new PCRelativeAddress(getDisp16(instruction));
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57 String name = getRegisterConditionName(rcond);
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58 return v9factory.newV9RegisterBranchInstruction(name, addr, annuled, rcond, rs1, predictTaken);
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59 }
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60 }
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