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 }