Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/asm/sparc/V9ReadDecoder.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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/* * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.asm.sparc; import sun.jvm.hotspot.asm.*; class V9ReadDecoder extends InstructionDecoder implements V9InstructionDecoder { Instruction decode(int instruction, SPARCInstructionFactory factory) { SPARCV9InstructionFactory v9factory = (SPARCV9InstructionFactory) factory; Instruction instr = null; int specialRegNum = getSourceRegister1(instruction); // rs1 values 1, 7-14 are reserved - see page 214, A.44 Read State Register. if (specialRegNum == 1 || (specialRegNum > 6 && specialRegNum < 15)) { instr = v9factory.newIllegalInstruction(instruction); } else { int rdNum = getDestinationRegister(instruction); if (specialRegNum == 15) { // may be stbar, member or illegal if (rdNum == 0) { boolean iBit = isIBitSet(instruction); if (iBit) { instr = v9factory.newV9MembarInstruction((instruction & MMASK_MASK) >>> MMASK_START_BIT, (instruction & CMASK_MASK) >>> CMASK_START_BIT); } else { instr = v9factory.newStbarInstruction(); } } else { // rd != 0 && rs1 == 15 instr = v9factory.newIllegalInstruction(instruction); } } else { int asrRegNum = -1; if (specialRegNum > 15){ asrRegNum = specialRegNum; specialRegNum = SPARCV9SpecialRegisters.ASR; } SPARCRegister rd = SPARCRegisters.getRegister(rdNum); instr = v9factory.newV9ReadInstruction(specialRegNum, asrRegNum, rd); } } return instr; } }