1 /* 2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2015, Red Hat Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 package sun.jvm.hotspot.runtime.linux_aarch64; 27 28 import java.io.*; 29 import java.util.*; 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.debugger.aarch64.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.runtime.aarch64.*; 34 import sun.jvm.hotspot.types.*; 35 import sun.jvm.hotspot.utilities.*; 36 37 public class LinuxAARCH64JavaThreadPDAccess implements JavaThreadPDAccess { 38 private static AddressField lastJavaFPField; 39 private static AddressField osThreadField; 40 41 // Field from OSThread 42 private static CIntegerField osThreadThreadIDField; 43 44 // This is currently unneeded but is being kept in case we change 45 // the currentFrameGuess algorithm 46 private static final long GUESS_SCAN_RANGE = 128 * 1024; 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 osThreadField = type.getAddressField("_osthread"); 59 60 Type anchorType = db.lookupType("JavaFrameAnchor"); 61 lastJavaFPField = anchorType.getAddressField("_last_Java_fp"); 62 63 Type osThreadType = db.lookupType("OSThread"); 64 osThreadThreadIDField = osThreadType.getCIntegerField("_thread_id"); 65 } 66 67 public Address getLastJavaFP(Address addr) { 68 return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset())); 69 } 70 71 public Address getLastJavaPC(Address addr) { 72 return null; 73 } 74 75 public Address getBaseOfStackPointer(Address addr) { 76 return null; 77 } 78 79 public Frame getLastFramePD(JavaThread thread, Address addr) { 80 Address fp = thread.getLastJavaFP(); 81 if (fp == null) { 82 return null; // no information 83 } 84 return new AARCH64Frame(thread.getLastJavaSP(), fp); 85 } 86 87 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) { 88 return new AARCH64RegisterMap(thread, updateMap); 89 } 90 91 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) { 92 ThreadProxy t = getThreadProxy(addr); 93 AARCH64ThreadContext context = (AARCH64ThreadContext) t.getContext(); 94 AARCH64CurrentFrameGuess guesser = new AARCH64CurrentFrameGuess(context, thread); 95 if (!guesser.run(GUESS_SCAN_RANGE)) { 96 return null; 97 } 98 if (guesser.getPC() == null) { 99 return new AARCH64Frame(guesser.getSP(), guesser.getFP()); 100 } else { 101 return new AARCH64Frame(guesser.getSP(), guesser.getFP(), guesser.getPC()); 102 } 103 } 104 105 public void printThreadIDOn(Address addr, PrintStream tty) { 106 tty.print(getThreadProxy(addr)); 107 } 108 109 public void printInfoOn(Address threadAddr, PrintStream tty) { 110 tty.print("Thread id: "); 111 printThreadIDOn(threadAddr, tty); 112 // tty.println("\nPostJavaState: " + getPostJavaState(threadAddr)); 113 } 114 115 public Address getLastSP(Address addr) { 116 ThreadProxy t = getThreadProxy(addr); 117 AARCH64ThreadContext context = (AARCH64ThreadContext) t.getContext(); 118 return context.getRegisterAsAddress(AARCH64ThreadContext.SP); 119 } 120 121 public ThreadProxy getThreadProxy(Address addr) { 122 // Addr is the address of the JavaThread. 123 // Fetch the OSThread (for now and for simplicity, not making a 124 // separate "OSThread" class in this package) 125 Address osThreadAddr = osThreadField.getValue(addr); 126 // Get the address of the _thread_id from the OSThread 127 Address threadIdAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset()); 128 129 JVMDebugger debugger = VM.getVM().getDebugger(); 130 return debugger.getThreadForIdentifierAddress(threadIdAddr); 131 } 132 }