1 /* 2 * Copyright (c) 2020, Microsoft Corporation. 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.win32_aarch64; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.debugger.aarch64.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.runtime.aarch64.*; 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 /** This class is only public to allow using the VMObjectFactory to 39 instantiate these. 40 */ 41 42 public class Win32AARCH64JavaThreadPDAccess implements JavaThreadPDAccess { 43 private static AddressField lastJavaFPField; 44 private static AddressField osThreadField; 45 46 // Field from OSThread 47 private static Field 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 static { 54 VM.registerVMInitializedObserver(new Observer() { 55 public void update(Observable o, Object data) { 56 initialize(VM.getVM().getTypeDataBase()); 57 } 58 }); 59 } 60 61 private static synchronized void initialize(TypeDataBase db) { 62 Type type = db.lookupType("JavaThread"); 63 osThreadField = type.getAddressField("_osthread"); 64 65 Type anchorType = db.lookupType("JavaFrameAnchor"); 66 lastJavaFPField = anchorType.getAddressField("_last_Java_fp"); 67 68 Type osThreadType = db.lookupType("OSThread"); 69 osThreadThreadIDField = osThreadType.getField("_thread_id"); 70 } 71 72 public Address getLastJavaFP(Address addr) { 73 return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset())); 74 } 75 76 public Address getLastJavaPC(Address addr) { 77 return null; 78 } 79 80 public Address getBaseOfStackPointer(Address addr) { 81 return null; 82 } 83 84 public Frame getLastFramePD(JavaThread thread, Address addr) { 85 Address fp = thread.getLastJavaFP(); 86 if (fp == null) { 87 return null; // no information 88 } 89 Address pc = thread.getLastJavaPC(); 90 if ( pc != null ) { 91 return new AARCH64Frame(thread.getLastJavaSP(), fp, pc); 92 } else { 93 return new AARCH64Frame(thread.getLastJavaSP(), fp); 94 } 95 } 96 97 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) { 98 return new AARCH64RegisterMap(thread, updateMap); 99 } 100 101 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) { 102 ThreadProxy t = getThreadProxy(addr); 103 AARCH64ThreadContext context = (AARCH64ThreadContext) t.getContext(); 104 AARCH64CurrentFrameGuess guesser = new AARCH64CurrentFrameGuess(context, thread); 105 if (!guesser.run(GUESS_SCAN_RANGE)) { 106 return null; 107 } 108 if (guesser.getPC() == null) { 109 return new AARCH64Frame(guesser.getSP(), guesser.getFP()); 110 } else { 111 return new AARCH64Frame(guesser.getSP(), guesser.getFP(), guesser.getPC()); 112 } 113 } 114 115 public void printThreadIDOn(Address addr, PrintStream tty) { 116 tty.print(getThreadProxy(addr)); 117 } 118 119 public void printInfoOn(Address threadAddr, PrintStream tty) { 120 } 121 122 public Address getLastSP(Address addr) { 123 ThreadProxy t = getThreadProxy(addr); 124 AARCH64ThreadContext context = (AARCH64ThreadContext) t.getContext(); 125 return context.getRegisterAsAddress(AARCH64ThreadContext.SP); 126 } 127 128 public ThreadProxy getThreadProxy(Address addr) { 129 // Addr is the address of the JavaThread. 130 // Fetch the OSThread (for now and for simplicity, not making a 131 // separate "OSThread" class in this package) 132 Address osThreadAddr = osThreadField.getValue(addr); 133 // Get the address of the thread_id within the OSThread 134 Address threadIdAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset()); 135 136 JVMDebugger debugger = VM.getVM().getDebugger(); 137 return debugger.getThreadForIdentifierAddress(threadIdAddr); 138 } 139 }