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 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 }