1 /* 2 * Copyright (c) 2000, 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.solaris_x86; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.debugger.x86.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.runtime.x86.*; 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 /** Placeholder for now to allow us to start the SA without support 39 for stack traces */ 40 41 public class SolarisX86JavaThreadPDAccess implements JavaThreadPDAccess { 42 private static AddressField lastJavaFPField; 43 private static AddressField osThreadField; 44 private static AddressField baseOfStackPointerField; 45 46 // Field from OSThread 47 private static CIntegerField osThreadThreadIDField; 48 49 // This is currently unneeded but is being kept in case we change 50 // the currentFrameGuess algorithm 51 private static final long GUESS_SCAN_RANGE = 128 * 1024; 52 53 54 static { 55 VM.registerVMInitializedObserver(new Observer() { 56 public void update(Observable o, Object data) { 57 initialize(VM.getVM().getTypeDataBase()); 58 } 59 }); 60 } 61 62 private static synchronized void initialize(TypeDataBase db) { 63 Type type = db.lookupType("JavaThread"); 64 Type anchorType = db.lookupType("JavaFrameAnchor"); 65 66 lastJavaFPField = anchorType.getAddressField("_last_Java_fp"); 67 osThreadField = type.getAddressField("_osthread"); 68 69 type = db.lookupType("OSThread"); 70 osThreadThreadIDField = type.getCIntegerField("_thread_id"); 71 } 72 73 public Address getLastJavaFP(Address addr) { 74 return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset())); 75 } 76 77 public Address getLastJavaPC(Address addr) { 78 return null; 79 } 80 81 public Address getBaseOfStackPointer(Address addr) { 82 return null; 83 } 84 85 public Frame getLastFramePD(JavaThread thread, Address addr) { 86 Address fp = thread.getLastJavaFP(); 87 if (fp == null) { 88 return null; // no information 89 } 90 Address pc = thread.getLastJavaPC(); 91 if ( pc != null ) { 92 return new X86Frame(thread.getLastJavaSP(), fp, pc); 93 } else { 94 return new X86Frame(thread.getLastJavaSP(), fp); 95 } 96 } 97 98 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) { 99 return new X86RegisterMap(thread, updateMap); 100 } 101 102 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) { 103 ThreadProxy t = getThreadProxy(addr); 104 X86ThreadContext context = (X86ThreadContext) t.getContext(); 105 X86CurrentFrameGuess guesser = new X86CurrentFrameGuess(context, thread); 106 if (!guesser.run(GUESS_SCAN_RANGE)) { 107 return null; 108 } 109 if (guesser.getPC() == null) { 110 return new X86Frame(guesser.getSP(), guesser.getFP()); 111 } else { 112 return new X86Frame(guesser.getSP(), guesser.getFP(), guesser.getPC()); 113 } 114 } 115 116 117 public void printThreadIDOn(Address addr, PrintStream tty) { 118 tty.print(getThreadProxy(addr)); 119 } 120 121 122 public void printInfoOn(Address threadAddr, PrintStream tty) { 123 } 124 125 public Address getLastSP(Address addr) { 126 ThreadProxy t = getThreadProxy(addr); 127 X86ThreadContext context = (X86ThreadContext) t.getContext(); 128 return context.getRegisterAsAddress(X86ThreadContext.ESP); 129 } 130 131 public ThreadProxy getThreadProxy(Address addr) { 132 // Fetch the OSThread (for now and for simplicity, not making a 133 // separate "OSThread" class in this package) 134 Address osThreadAddr = osThreadField.getValue(addr); 135 // Get the address of the thread ID from the OSThread 136 Address tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset()); 137 138 JVMDebugger debugger = VM.getVM().getDebugger(); 139 return debugger.getThreadForIdentifierAddress(tidAddr); 140 } 141 142 }