1 /* 2 * Copyright 2000-2002 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 import sun.jvm.hotspot.runtime.*; 29 import sun.jvm.hotspot.utilities.*; 30 31 public class SPARCRegister extends Register { 32 private static final int nofRegisters = 32; // total number of registers 33 34 private static final int GLOBAL_BASE = 0; 35 private static final int OUT_BASE = 8; 36 private static final int LOCAL_BASE = 16; 37 private static final int IN_BASE = 24; 38 39 private static final int LOCAL_SP_WORD_OFFSET = 0; 40 private static final int IN_SP_WORD_OFFSET = 8; 41 42 /** Constructor for an explicitly numbered register */ 43 public SPARCRegister(int number) { 44 super(number); 45 } 46 47 /** Constructor for an I, G, O, or L register */ 48 public SPARCRegister(SPARCRegisterType type, int number) { 49 if (type == SPARCRegisterType.GLOBAL) { 50 this.number = number + GLOBAL_BASE; 51 } else if (type == SPARCRegisterType.OUT) { 52 this.number = number + OUT_BASE; 53 } else if (type == SPARCRegisterType.LOCAL) { 54 this.number = number + LOCAL_BASE; 55 } else if (type == SPARCRegisterType.IN) { 56 this.number = number + IN_BASE; 57 } else { 58 throw new IllegalArgumentException("Invalid SPARC register type"); 59 } 60 } 61 62 public int getNumberOfRegisters() { 63 return nofRegisters; 64 } 65 66 public boolean isIn() { 67 return (IN_BASE <= getNumber()); 68 } 69 70 public boolean isLocal() { 71 return (LOCAL_BASE <= getNumber() && getNumber() < IN_BASE); 72 } 73 74 public boolean isOut() { 75 return (OUT_BASE <= getNumber() && getNumber() < LOCAL_BASE); 76 } 77 78 public boolean isGlobal() { 79 return (GLOBAL_BASE <= getNumber() && getNumber() < OUT_BASE); 80 } 81 82 public SPARCRegister afterSave() { 83 if (Assert.ASSERTS_ENABLED) { 84 Assert.that(isOut() || isGlobal(), "register not visible after save"); 85 } 86 return isOut() ? new SPARCRegister(getNumber() + (IN_BASE - OUT_BASE)) : this; 87 } 88 89 public SPARCRegister afterRestore() { 90 if (Assert.ASSERTS_ENABLED) { 91 Assert.that(isIn() || isGlobal(), "register not visible after save"); 92 } 93 return isIn() ? new SPARCRegister(getNumber() + (OUT_BASE - IN_BASE)) : this; 94 } 95 96 /** NOTE: this returns an offset in BYTES in this system! */ 97 public long spOffsetInSavedWindow() { 98 if (isIn()) { 99 return VM.getVM().getAddressSize() * (getNumber() - IN_BASE + IN_SP_WORD_OFFSET); 100 } else if (isLocal()) { 101 return VM.getVM().getAddressSize() * (getNumber() - LOCAL_BASE + LOCAL_SP_WORD_OFFSET); 102 } 103 if (Assert.ASSERTS_ENABLED) { 104 Assert.that(isIn() || isLocal(), "only ins and locals are saved in my frame"); 105 } 106 return 0; 107 } 108 109 public String toString() { 110 return SPARCRegisters.getRegisterName(number); 111 } 112 113 public boolean isFramePointer() { 114 return number == 30; // is I6? 115 } 116 117 public boolean isStackPointer() { 118 return number == 14; // is O6? 119 } 120 121 public boolean isFloat() { 122 return false; 123 } 124 125 public boolean isV9Only() { 126 return false; 127 } 128 }