1 /* 2 * Copyright (c) 2006, 2020, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.runtime.linux_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 import sun.jvm.hotspot.utilities.Observable; 36 import sun.jvm.hotspot.utilities.Observer; 37 38 public class LinuxSPARCJavaThreadPDAccess implements JavaThreadPDAccess { 39 private static AddressField baseOfStackPointerField; 40 private static AddressField postJavaStateField; 41 private static AddressField osThreadField; 42 private static int isPC; 43 private static int hasFlushed; 44 45 // Field from OSThread 46 private static CIntegerField osThreadThreadIDField; 47 48 static { 49 VM.registerVMInitializedObserver(new Observer() { 50 public void update(Observable o, Object data) { 51 initialize(VM.getVM().getTypeDataBase()); 52 } 53 }); 54 } 55 56 private static synchronized void initialize(TypeDataBase db) { 57 Type type = db.lookupType("JavaThread"); 58 Type anchorType = db.lookupType("JavaFrameAnchor"); 59 60 osThreadField = type.getAddressField("_osthread"); 61 hasFlushed = db.lookupIntConstant("JavaFrameAnchor::flushed").intValue(); 62 63 type = db.lookupType("OSThread"); 64 osThreadThreadIDField = type.getCIntegerField("_thread_id"); 65 } 66 67 public Address getLastJavaFP(Address addr) { 68 return null; 69 70 } 71 72 public Address getLastJavaPC(Address addr) { 73 return null; 74 } 75 76 public Address getBaseOfStackPointer(Address addr) { 77 return baseOfStackPointerField.getValue(addr); 78 } 79 80 public Frame getLastFramePD(JavaThread thread, Address addr) { 81 82 // This assert doesn't work in the debugging case for threads 83 // which are running Java code and which haven't re-entered the 84 // runtime (e.g., through a Method.invoke() or otherwise). They 85 // haven't yet "decached" their last Java stack pointer to the 86 // thread. 87 88 // if (Assert.ASSERTS_ENABLED) { 89 // Assert.that(hasLastJavaFrame(), "must have last_Java_sp() when suspended"); 90 // // FIXME: add assertion about flushing register windows for runtime system 91 // // (not appropriate for debugging system, though, unless at safepoin t) 92 // } 93 94 // FIXME: I don't think this is necessary, but might be useful 95 // while debugging 96 if (thread.getLastJavaSP() == null) { 97 return null; 98 } 99 100 // sparc does a lazy window flush. The _flags field of the JavaFrameAnchor 101 // encodes whether the windows have flushed. Whenever the windows have flushed 102 // there will be a last_Java_pc. 103 // In a relective system we'd have to do something to force the thread to flush 104 // its windows and give us the pc (or the younger_sp so we can find it ourselves) 105 // In a debugger situation (process or core) the flush should have happened and 106 // so if we don't have the younger sp we can find it 107 // 108 if (thread.getLastJavaPC() != null) { 109 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), thread.getLastJavaPC()); 110 } else { 111 Frame top = getCurrentFrameGuess(thread, addr); 112 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), 113 SPARCFrame.biasSP(SPARCFrame.findYoungerSP(top.getSP(), thread.getLastJavaSP())), 114 false); 115 } 116 117 118 } 119 120 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) { 121 return new SPARCRegisterMap(thread, updateMap); 122 } 123 124 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) { 125 ThreadProxy t = getThreadProxy(addr); 126 SPARCThreadContext context = (SPARCThreadContext) t.getContext(); 127 // For now, let's see what happens if we do a similar thing to 128 // what the runtime code does. I suspect this may cause us to lose 129 // the top frame from the stack. 130 Address sp = context.getRegisterAsAddress(SPARCThreadContext.R_SP); 131 Address pc = context.getRegisterAsAddress(SPARCThreadContext.R_PC); 132 133 if ((sp == null) || (pc == null)) { 134 // Problems (have not hit this case so far, but would be bad to continue if we did) 135 return null; 136 } 137 138 return new SPARCFrame(sp, pc); 139 } 140 141 142 public void printThreadIDOn(Address addr, PrintStream tty) { 143 tty.print(getThreadProxy(addr)); 144 } 145 146 public Address getLastSP(Address addr) { 147 ThreadProxy t = getThreadProxy(addr); 148 SPARCThreadContext context = (SPARCThreadContext) t.getContext(); 149 return SPARCFrame.unBiasSP(context.getRegisterAsAddress(SPARCThreadContext.R_SP)); 150 } 151 152 public void printInfoOn(Address threadAddr, PrintStream tty) { 153 } 154 155 public ThreadProxy getThreadProxy(Address addr) { 156 // Fetch the OSThread (for now and for simplicity, not making a 157 // separate "OSThread" class in this package) 158 Address osThreadAddr = osThreadField.getValue(addr); 159 // Get the address of the thread ID from the OSThread 160 Address tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset()); 161 162 JVMDebugger debugger = VM.getVM().getDebugger(); 163 return debugger.getThreadForIdentifierAddress(tidAddr); 164 } 165 166 167 }