Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9WriteDecoder.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.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 V9WriteDecoder extends InstructionDecoder | |
30 implements V9InstructionDecoder { | |
31 Instruction decode(int instruction, SPARCInstructionFactory factory) { | |
32 SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory; | |
33 Instruction instr = null; | |
34 int specialRegNum = getDestinationRegister(instruction); | |
35 | |
36 // rd values 1, 4,5 7-14 are reserved - see page 244, A.63 Write State Register. | |
37 if (specialRegNum == 1 || specialRegNum == 4 || specialRegNum == 5 | |
38 || (specialRegNum > 6 && specialRegNum < 15)) { | |
39 instr = v9factory.newIllegalInstruction(instruction); | |
40 } else { | |
41 int rs1Num = getSourceRegister1(instruction); | |
42 if (specialRegNum == 15) { | |
43 if (isIBitSet(instruction) && rs1Num == 0) { | |
44 instr = v9factory.newV9SirInstruction(); | |
45 } else { | |
46 instr = v9factory.newIllegalInstruction(instruction); | |
47 } | |
48 } else { | |
49 int asrRegNum = -1; | |
50 if (specialRegNum > 15) { | |
51 asrRegNum = specialRegNum; | |
52 specialRegNum = SPARCV9SpecialRegisters.ASR; | |
53 } | |
54 SPARCRegister rs1 = SPARCRegisters.getRegister(rs1Num); | |
55 instr = v9factory.newV9WriteInstruction(specialRegNum, asrRegNum, rs1, getOperand2(instruction)); | |
56 } | |
57 } | |
58 | |
59 return instr; | |
60 } | |
61 } |