1 /* |
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2 * Copyright (c) 2002, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * 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 class JmplDecoder extends MemoryInstructionDecoder { |
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30 JmplDecoder() { |
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31 super(JMPL, "jmpl", RTLDT_UNSIGNED_WORD); |
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32 } |
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33 |
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34 Instruction decodeMemoryInstruction(int instruction, SPARCRegisterIndirectAddress addr, |
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35 SPARCRegister rd, SPARCInstructionFactory factory) { |
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36 // this may be most probably indirect call or ret or retl |
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37 Instruction instr = null; |
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38 if (rd == SPARCRegisters.O7) { |
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39 instr = factory.newIndirectCallInstruction(addr, rd); |
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40 } else if (rd == SPARCRegisters.G0) { |
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41 int disp = (int) addr.getDisplacement(); |
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42 Register base = addr.getBase(); |
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43 if (base == SPARCRegisters.I7 && disp == 8) { |
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44 instr = factory.newReturnInstruction(addr, rd, false /* not leaf */); |
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45 } else if (base == SPARCRegisters.O7 && disp == 8) { |
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46 instr = factory.newReturnInstruction(addr, rd, true /* leaf */); |
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47 } else { |
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48 instr = factory.newJmplInstruction(addr, rd); |
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49 } |
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50 } else { |
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51 instr = factory.newJmplInstruction(addr, rd); |
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52 } |
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53 return instr; |
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54 } |
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55 } |
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