LinuxAARCH64JavaThreadPDAccess.java revision 9883:903a2e023ffb 
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
26package sun.jvm.hotspot.runtime.linux_aarch64;
27
28import java.io.*;
29import java.util.*;
30import sun.jvm.hotspot.debugger.*;
31import sun.jvm.hotspot.debugger.aarch64.*;
32import sun.jvm.hotspot.runtime.*;
33import sun.jvm.hotspot.runtime.aarch64.*;
34import sun.jvm.hotspot.types.*;
35import sun.jvm.hotspot.utilities.*;
36
37public 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}
133