1 /* 2 * Copyright 2000-2006 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.runtime.solaris_sparc; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.debugger.sparc.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.runtime.sparc.*; 33 import sun.jvm.hotspot.types.*; 34 import sun.jvm.hotspot.utilities.*; 35 36 public class SolarisSPARCJavaThreadPDAccess implements JavaThreadPDAccess { 37 private static AddressField baseOfStackPointerField; 38 private static AddressField postJavaStateField; 39 private static AddressField osThreadField; 40 private static int isPC; 41 private static int hasFlushed; 42 43 // Field from OSThread 44 private static CIntegerField osThreadThreadIDField; 45 46 static { 47 VM.registerVMInitializedObserver(new Observer() { 48 public void update(Observable o, Object data) { 49 initialize(VM.getVM().getTypeDataBase()); 50 } 51 }); 52 } 53 54 private static synchronized void initialize(TypeDataBase db) { 55 Type type = db.lookupType("JavaThread"); 56 Type anchorType = db.lookupType("JavaFrameAnchor"); 57 58 baseOfStackPointerField = type.getAddressField("_base_of_stack_pointer"); 59 osThreadField = type.getAddressField("_osthread"); 60 hasFlushed = db.lookupIntConstant("JavaFrameAnchor::flushed").intValue(); 61 62 type = db.lookupType("OSThread"); 63 osThreadThreadIDField = type.getCIntegerField("_thread_id"); 64 } 65 66 public Address getLastJavaFP(Address addr) { 67 return null; 68 69 } 70 71 public Address getLastJavaPC(Address addr) { 72 return null; 73 } 74 75 public Address getBaseOfStackPointer(Address addr) { 76 return baseOfStackPointerField.getValue(addr); 77 } 78 79 public Frame getLastFramePD(JavaThread thread, Address addr) { 80 81 // This assert doesn't work in the debugging case for threads 82 // which are running Java code and which haven't re-entered the 83 // runtime (e.g., through a Method.invoke() or otherwise). They 84 // haven't yet "decached" their last Java stack pointer to the 85 // thread. 86 87 // if (Assert.ASSERTS_ENABLED) { 88 // Assert.that(hasLastJavaFrame(), "must have last_Java_sp() when suspended"); 89 // // FIXME: add assertion about flushing register windows for runtime system 90 // // (not appropriate for debugging system, though, unless at safepoin t) 91 // } 92 93 // FIXME: I don't think this is necessary, but might be useful 94 // while debugging 95 if (thread.getLastJavaSP() == null) { 96 return null; 97 } 98 99 // sparc does a lazy window flush. The _flags field of the JavaFrameAnchor 100 // encodes whether the windows have flushed. Whenever the windows have flushed 101 // there will be a last_Java_pc. 102 // In a relective system we'd have to do something to force the thread to flush 103 // its windows and give us the pc (or the younger_sp so we can find it ourselves) 104 // In a debugger situation (process or core) the flush should have happened and 105 // so if we don't have the younger sp we can find it 106 // 107 if (thread.getLastJavaPC() != null) { 108 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), thread.getLastJavaPC()); 109 } else { 110 Frame top = getCurrentFrameGuess(thread, addr); 111 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), 112 SPARCFrame.biasSP(SPARCFrame.findYoungerSP(top.getSP(), thread.getLastJavaSP())), 113 false); 114 } 115 116 117 } 118 119 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) { 120 return new SPARCRegisterMap(thread, updateMap); 121 } 122 123 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) { 124 125 // If java stack is walkable then both last_Java_sp and last_Java_pc are 126 // non null and we can start stack walk from this frame. 127 if (thread.getLastJavaSP() != null && thread.getLastJavaPC() != null) { 128 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), thread.getLastJavaPC()); 129 } 130 131 ThreadProxy t = getThreadProxy(addr); 132 SPARCThreadContext context = (SPARCThreadContext) t.getContext(); 133 // For now, let's see what happens if we do a similar thing to 134 // what the runtime code does. I suspect this may cause us to lose 135 // the top frame from the stack. 136 Address sp = context.getRegisterAsAddress(SPARCThreadContext.R_SP); 137 Address pc = context.getRegisterAsAddress(SPARCThreadContext.R_PC); 138 139 if ((sp == null) || (pc == null)) { 140 // Problems (have not hit this case so far, but would be bad to continue if we did) 141 return null; 142 } 143 144 return new SPARCFrame(sp, pc); 145 } 146 147 148 public void printThreadIDOn(Address addr, PrintStream tty) { 149 tty.print(getThreadProxy(addr)); 150 } 151 152 public Address getLastSP(Address addr) { 153 ThreadProxy t = getThreadProxy(addr); 154 SPARCThreadContext context = (SPARCThreadContext) t.getContext(); 155 return SPARCFrame.unBiasSP(context.getRegisterAsAddress(SPARCThreadContext.R_SP)); 156 } 157 158 public void printInfoOn(Address threadAddr, PrintStream tty) { 159 } 160 161 public ThreadProxy getThreadProxy(Address addr) { 162 // Fetch the OSThread (for now and for simplicity, not making a 163 // separate "OSThread" class in this package) 164 Address osThreadAddr = osThreadField.getValue(addr); 165 // Get the address of the thread ID from the OSThread 166 Address tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset()); 167 168 JVMDebugger debugger = VM.getVM().getDebugger(); 169 return debugger.getThreadForIdentifierAddress(tidAddr); 170 } 171 172 173 }