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3960
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1 /*
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2 * Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger.bsd;
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26
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27 import java.io.*;
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28 import java.net.*;
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29 import java.util.*;
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.debugger.x86.*;
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32 import sun.jvm.hotspot.debugger.cdbg.*;
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33 import sun.jvm.hotspot.utilities.*;
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34 import java.lang.reflect.*;
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35
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36 /** <P> An implementation of the JVMDebugger interface. The basic debug
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37 facilities are implemented through ptrace interface in the JNI code
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38 (libsaproc.so). Library maps and symbol table management are done in
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39 JNI. </P>
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40
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41 <P> <B>NOTE</B> that since we have the notion of fetching "Java
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42 primitive types" from the remote process (which might have
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43 different sizes than we expect) we have a bootstrapping
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44 problem. We need to know the sizes of these types before we can
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45 fetch them. The current implementation solves this problem by
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46 requiring that it be configured with these type sizes before they
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47 can be fetched. The readJ(Type) routines here will throw a
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48 RuntimeException if they are called before the debugger is
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49 configured with the Java primitive type sizes. </P> */
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50
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51 public class BsdDebuggerLocal extends DebuggerBase implements BsdDebugger {
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52 private boolean useGCC32ABI;
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53 private boolean attached;
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54 private long p_ps_prochandle; // native debugger handle
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55 private boolean isCore;
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56
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57 // CDebugger support
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58 private BsdCDebugger cdbg;
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59
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60 // threadList and loadObjectList are filled by attach0 method
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61 private List threadList;
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62 private List loadObjectList;
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63
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64 // called by native method lookupByAddress0
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65 private ClosestSymbol createClosestSymbol(String name, long offset) {
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66 return new ClosestSymbol(name, offset);
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67 }
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68
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69 // called by native method attach0
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70 private LoadObject createLoadObject(String fileName, long textsize,
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71 long base) {
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72 File f = new File(fileName);
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73 Address baseAddr = newAddress(base);
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74 return new SharedObject(this, fileName, f.length(), baseAddr);
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75 }
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76
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77 // native methods
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78
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79 private native static void init0()
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80 throws DebuggerException;
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81 private native void attach0(int pid)
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82 throws DebuggerException;
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83 private native void attach0(String execName, String coreName)
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84 throws DebuggerException;
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85 private native void detach0()
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86 throws DebuggerException;
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87 private native long lookupByName0(String objectName, String symbol)
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88 throws DebuggerException;
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89 private native ClosestSymbol lookupByAddress0(long address)
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90 throws DebuggerException;
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91 private native long[] getThreadIntegerRegisterSet0(int lwp_id)
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92 throws DebuggerException;
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93 private native byte[] readBytesFromProcess0(long address, long numBytes)
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94 throws DebuggerException;
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95 public native static int getAddressSize() ;
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96
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97 // Note on Bsd threads are really processes. When target process is
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98 // attached by a serviceability agent thread, only that thread can do
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99 // ptrace operations on the target. This is because from kernel's point
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100 // view, other threads are just separate processes and they are not
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101 // attached to the target. When they attempt to make ptrace calls,
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102 // an ESRCH error will be returned as kernel believes target is not
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103 // being traced by the caller.
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104 // To work around the problem, we use a worker thread here to handle
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105 // all JNI functions that are making ptrace calls.
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106
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107 interface WorkerThreadTask {
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108 public void doit(BsdDebuggerLocal debugger) throws DebuggerException;
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109 }
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110
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111 class BsdDebuggerLocalWorkerThread extends Thread {
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112 BsdDebuggerLocal debugger;
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113 WorkerThreadTask task;
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114 DebuggerException lastException;
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115
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116 public BsdDebuggerLocalWorkerThread(BsdDebuggerLocal debugger) {
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117 this.debugger = debugger;
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118 setDaemon(true);
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119 }
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120
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121 public void run() {
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122 synchronized (workerThread) {
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123 for (;;) {
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124 if (task != null) {
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125 lastException = null;
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126 try {
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127 task.doit(debugger);
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128 } catch (DebuggerException exp) {
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129 lastException = exp;
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130 }
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131 task = null;
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132 workerThread.notifyAll();
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133 }
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134
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135 try {
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136 workerThread.wait();
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137 } catch (InterruptedException x) {}
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138 }
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139 }
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140 }
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141
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142 public WorkerThreadTask execute(WorkerThreadTask task) throws DebuggerException {
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143 synchronized (workerThread) {
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144 this.task = task;
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145 workerThread.notifyAll();
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146 while (this.task != null) {
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147 try {
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148 workerThread.wait();
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149 } catch (InterruptedException x) {}
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150 }
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151 if (lastException != null) {
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152 throw new DebuggerException(lastException);
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153 } else {
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154 return task;
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155 }
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156 }
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157 }
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158 }
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159
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160 private BsdDebuggerLocalWorkerThread workerThread = null;
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161
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162 //----------------------------------------------------------------------
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163 // Implementation of Debugger interface
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164 //
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165
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166 /** <P> machDesc may not be null. </P>
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167
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168 <P> useCache should be set to true if debugging is being done
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169 locally, and to false if the debugger is being created for the
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170 purpose of supporting remote debugging. </P> */
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171 public BsdDebuggerLocal(MachineDescription machDesc,
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172 boolean useCache) throws DebuggerException {
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173 this.machDesc = machDesc;
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174 utils = new DebuggerUtilities(machDesc.getAddressSize(),
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175 machDesc.isBigEndian()) {
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176 public void checkAlignment(long address, long alignment) {
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177 // Need to override default checkAlignment because we need to
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178 // relax alignment constraints on Bsd/x86
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179 if ( (address % alignment != 0)
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180 &&(alignment != 8 || address % 4 != 0)) {
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181 throw new UnalignedAddressException(
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182 "Trying to read at address: "
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183 + addressValueToString(address)
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184 + " with alignment: " + alignment,
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185 address);
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186 }
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187 }
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188 };
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189
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190 if (useCache) {
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191 // FIXME: re-test necessity of cache on Bsd, where data
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192 // fetching is faster
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193 // Cache portion of the remote process's address space.
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194 // Fetching data over the socket connection to dbx is slow.
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195 // Might be faster if we were using a binary protocol to talk to
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196 // dbx, but would have to test. For now, this cache works best
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197 // if it covers the entire heap of the remote process. FIXME: at
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198 // least should make this tunable from the outside, i.e., via
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199 // the UI. This is a cache of 4096 4K pages, or 16 MB. The page
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200 // size must be adjusted to be the hardware's page size.
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201 // (FIXME: should pick this up from the debugger.)
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202 if (getCPU().equals("ia64")) {
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203 initCache(16384, parseCacheNumPagesProperty(1024));
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204 } else {
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205 initCache(4096, parseCacheNumPagesProperty(4096));
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206 }
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207 }
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208
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209 workerThread = new BsdDebuggerLocalWorkerThread(this);
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210 workerThread.start();
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211 }
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212
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213 /** From the Debugger interface via JVMDebugger */
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214 public boolean hasProcessList() throws DebuggerException {
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215 return false;
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216 }
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217
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218 /** From the Debugger interface via JVMDebugger */
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219 public List getProcessList() throws DebuggerException {
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220 throw new DebuggerException("getProcessList not implemented yet");
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221 }
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222
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223 private void checkAttached() throws DebuggerException {
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224 if (attached) {
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225 if (isCore) {
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226 throw new DebuggerException("attached to a core dump already");
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227 } else {
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228 throw new DebuggerException("attached to a process already");
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229 }
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230 }
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231 }
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232
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233 private void requireAttach() {
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234 if (! attached) {
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235 throw new RuntimeException("not attached to a process or a core!");
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236 }
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237 }
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238
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239 /* called from attach methods */
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240 private void findABIVersion() throws DebuggerException {
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241 if (lookupByName0("libjvm.so", "__vt_10JavaThread") != 0 ||
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242 lookupByName0("libjvm_g.so", "__vt_10JavaThread") != 0) {
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243 // old C++ ABI
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244 useGCC32ABI = false;
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245 } else {
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246 // new C++ ABI
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247 useGCC32ABI = true;
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248 }
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249 }
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250
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251 /** From the Debugger interface via JVMDebugger */
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252 public synchronized void attach(int processID) throws DebuggerException {
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253 checkAttached();
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254 threadList = new ArrayList();
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255 loadObjectList = new ArrayList();
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256 class AttachTask implements WorkerThreadTask {
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257 int pid;
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258 public void doit(BsdDebuggerLocal debugger) {
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259 debugger.attach0(pid);
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260 debugger.attached = true;
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261 debugger.isCore = false;
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262 findABIVersion();
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263 }
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264 }
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265
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266 AttachTask task = new AttachTask();
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267 task.pid = processID;
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268 workerThread.execute(task);
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269 }
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270
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271 /** From the Debugger interface via JVMDebugger */
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272 public synchronized void attach(String execName, String coreName) {
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273 checkAttached();
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274 threadList = new ArrayList();
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275 loadObjectList = new ArrayList();
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276 attach0(execName, coreName);
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277 attached = true;
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278 isCore = true;
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279 findABIVersion();
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280 }
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281
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282 /** From the Debugger interface via JVMDebugger */
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283 public synchronized boolean detach() {
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284 if (!attached) {
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285 return false;
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286 }
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287
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288 threadList = null;
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289 loadObjectList = null;
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290
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291 if (isCore) {
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292 detach0();
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293 attached = false;
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294 return true;
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295 } else {
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296 class DetachTask implements WorkerThreadTask {
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297 boolean result = false;
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298
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299 public void doit(BsdDebuggerLocal debugger) {
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300 debugger.detach0();
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301 debugger.attached = false;
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302 result = true;
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303 }
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304 }
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305
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306 DetachTask task = new DetachTask();
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307 workerThread.execute(task);
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308 return task.result;
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309 }
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310 }
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311
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312 /** From the Debugger interface via JVMDebugger */
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313 public Address parseAddress(String addressString)
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314 throws NumberFormatException {
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315 long addr = utils.scanAddress(addressString);
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316 if (addr == 0) {
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317 return null;
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318 }
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319 return new BsdAddress(this, addr);
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320 }
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321
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322 /** From the Debugger interface via JVMDebugger */
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323 public String getOS() {
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324 return PlatformInfo.getOS();
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325 }
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326
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327 /** From the Debugger interface via JVMDebugger */
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328 public String getCPU() {
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329 return PlatformInfo.getCPU();
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330 }
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331
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332 public boolean hasConsole() throws DebuggerException {
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333 return false;
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334 }
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335
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336 public String consoleExecuteCommand(String cmd) throws DebuggerException {
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337 throw new DebuggerException("No debugger console available on Bsd");
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338 }
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339
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340 public String getConsolePrompt() throws DebuggerException {
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341 return null;
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342 }
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343
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344 /* called from lookup */
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345 private long handleGCC32ABI(long addr, String symbol) throws DebuggerException {
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346 if (useGCC32ABI && symbol.startsWith("_ZTV")) {
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347 return addr + (2 * machDesc.getAddressSize());
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348 } else {
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349 return addr;
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350 }
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351 }
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352
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353 /** From the SymbolLookup interface via Debugger and JVMDebugger */
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354 public synchronized Address lookup(String objectName, String symbol) {
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355 requireAttach();
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356 if (!attached) {
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357 return null;
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358 }
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359
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360 if (isCore) {
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361 long addr = lookupByName0(objectName, symbol);
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362 return (addr == 0)? null : new BsdAddress(this, handleGCC32ABI(addr, symbol));
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363 } else {
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364 class LookupByNameTask implements WorkerThreadTask {
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365 String objectName, symbol;
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366 Address result;
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367
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368 public void doit(BsdDebuggerLocal debugger) {
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369 long addr = debugger.lookupByName0(objectName, symbol);
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370 result = (addr == 0 ? null : new BsdAddress(debugger, handleGCC32ABI(addr, symbol)));
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371 }
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372 }
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373
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374 LookupByNameTask task = new LookupByNameTask();
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375 task.objectName = objectName;
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376 task.symbol = symbol;
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377 workerThread.execute(task);
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378 return task.result;
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379 }
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380 }
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381
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382 /** From the SymbolLookup interface via Debugger and JVMDebugger */
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383 public synchronized OopHandle lookupOop(String objectName, String symbol) {
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384 Address addr = lookup(objectName, symbol);
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385 if (addr == null) {
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386 return null;
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387 }
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388 return addr.addOffsetToAsOopHandle(0);
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389 }
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390
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391 /** From the Debugger interface */
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392 public MachineDescription getMachineDescription() {
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393 return machDesc;
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394 }
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395
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396 //----------------------------------------------------------------------
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397 // Implementation of ThreadAccess interface
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398 //
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399
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400 /** From the ThreadAccess interface via Debugger and JVMDebugger */
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401 public ThreadProxy getThreadForIdentifierAddress(Address addr) {
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402 return new BsdThread(this, addr);
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403 }
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404
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405 /** From the ThreadAccess interface via Debugger and JVMDebugger */
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406 public ThreadProxy getThreadForThreadId(long id) {
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407 return new BsdThread(this, id);
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408 }
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409
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410 //----------------------------------------------------------------------
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411 // Internal routines (for implementation of BsdAddress).
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412 // These must not be called until the MachineDescription has been set up.
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413 //
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414
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415 /** From the BsdDebugger interface */
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416 public String addressValueToString(long address) {
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417 return utils.addressValueToString(address);
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418 }
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419
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420 /** From the BsdDebugger interface */
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421 public BsdAddress readAddress(long address)
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422 throws UnmappedAddressException, UnalignedAddressException {
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423 long value = readAddressValue(address);
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424 return (value == 0 ? null : new BsdAddress(this, value));
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425 }
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426 public BsdAddress readCompOopAddress(long address)
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427 throws UnmappedAddressException, UnalignedAddressException {
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428 long value = readCompOopAddressValue(address);
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429 return (value == 0 ? null : new BsdAddress(this, value));
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430 }
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431
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432 /** From the BsdDebugger interface */
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433 public BsdOopHandle readOopHandle(long address)
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434 throws UnmappedAddressException, UnalignedAddressException,
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435 NotInHeapException {
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436 long value = readAddressValue(address);
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437 return (value == 0 ? null : new BsdOopHandle(this, value));
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438 }
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439 public BsdOopHandle readCompOopHandle(long address)
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440 throws UnmappedAddressException, UnalignedAddressException,
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441 NotInHeapException {
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442 long value = readCompOopAddressValue(address);
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443 return (value == 0 ? null : new BsdOopHandle(this, value));
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444 }
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445
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446 //----------------------------------------------------------------------
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447 // Thread context access
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448 //
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449
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450 public synchronized long[] getThreadIntegerRegisterSet(int lwp_id)
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451 throws DebuggerException {
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452 requireAttach();
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453 if (isCore) {
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454 return getThreadIntegerRegisterSet0(lwp_id);
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455 } else {
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456 class GetThreadIntegerRegisterSetTask implements WorkerThreadTask {
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457 int lwp_id;
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458 long[] result;
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459 public void doit(BsdDebuggerLocal debugger) {
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460 result = debugger.getThreadIntegerRegisterSet0(lwp_id);
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461 }
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462 }
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463
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464 GetThreadIntegerRegisterSetTask task = new GetThreadIntegerRegisterSetTask();
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465 task.lwp_id = lwp_id;
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466 workerThread.execute(task);
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467 return task.result;
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468 }
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|
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469 }
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470
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471 /** Need to override this to relax alignment checks on x86. */
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472 public long readCInteger(long address, long numBytes, boolean isUnsigned)
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473 throws UnmappedAddressException, UnalignedAddressException {
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474 // Only slightly relaxed semantics -- this is a hack, but is
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475 // necessary on x86 where it seems the compiler is
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476 // putting some global 64-bit data on 32-bit boundaries
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|
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477 if (numBytes == 8) {
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|
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478 utils.checkAlignment(address, 4);
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|
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479 } else {
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|
|
480 utils.checkAlignment(address, numBytes);
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|
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481 }
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|
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482 byte[] data = readBytes(address, numBytes);
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483 return utils.dataToCInteger(data, isUnsigned);
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|
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484 }
|
|
|
485
|
|
|
486 // Overridden from DebuggerBase because we need to relax alignment
|
|
|
487 // constraints on x86
|
|
|
488 public long readJLong(long address)
|
|
|
489 throws UnmappedAddressException, UnalignedAddressException {
|
|
|
490 utils.checkAlignment(address, jintSize);
|
|
|
491 byte[] data = readBytes(address, jlongSize);
|
|
|
492 return utils.dataToJLong(data, jlongSize);
|
|
|
493 }
|
|
|
494
|
|
|
495 //----------------------------------------------------------------------
|
|
|
496 // Address access. Can not be package private, but should only be
|
|
|
497 // accessed by the architecture-specific subpackages.
|
|
|
498
|
|
|
499 /** From the BsdDebugger interface */
|
|
|
500 public long getAddressValue(Address addr) {
|
|
|
501 if (addr == null) return 0;
|
|
|
502 return ((BsdAddress) addr).getValue();
|
|
|
503 }
|
|
|
504
|
|
|
505 /** From the BsdDebugger interface */
|
|
|
506 public Address newAddress(long value) {
|
|
|
507 if (value == 0) return null;
|
|
|
508 return new BsdAddress(this, value);
|
|
|
509 }
|
|
|
510
|
|
|
511 /** From the BsdCDebugger interface */
|
|
|
512 public List/*<ThreadProxy>*/ getThreadList() {
|
|
|
513 requireAttach();
|
|
|
514 return threadList;
|
|
|
515 }
|
|
|
516
|
|
|
517 /** From the BsdCDebugger interface */
|
|
|
518 public List/*<LoadObject>*/ getLoadObjectList() {
|
|
|
519 requireAttach();
|
|
|
520 return loadObjectList;
|
|
|
521 }
|
|
|
522
|
|
|
523 /** From the BsdCDebugger interface */
|
|
|
524 public synchronized ClosestSymbol lookup(long addr) {
|
|
|
525 requireAttach();
|
|
|
526 if (isCore) {
|
|
|
527 return lookupByAddress0(addr);
|
|
|
528 } else {
|
|
|
529 class LookupByAddressTask implements WorkerThreadTask {
|
|
|
530 long addr;
|
|
|
531 ClosestSymbol result;
|
|
|
532
|
|
|
533 public void doit(BsdDebuggerLocal debugger) {
|
|
|
534 result = debugger.lookupByAddress0(addr);
|
|
|
535 }
|
|
|
536 }
|
|
|
537
|
|
|
538 LookupByAddressTask task = new LookupByAddressTask();
|
|
|
539 task.addr = addr;
|
|
|
540 workerThread.execute(task);
|
|
|
541 return task.result;
|
|
|
542 }
|
|
|
543 }
|
|
|
544
|
|
|
545 public CDebugger getCDebugger() {
|
|
|
546 if (cdbg == null) {
|
|
|
547 String cpu = getCPU();
|
|
|
548 if (cpu.equals("ia64") ) {
|
|
|
549 // IA-64 is not supported because of stack-walking issues
|
|
|
550 return null;
|
|
|
551 }
|
|
|
552 cdbg = new BsdCDebugger(this);
|
|
|
553 }
|
|
|
554 return cdbg;
|
|
|
555 }
|
|
|
556
|
|
|
557 /** This reads bytes from the remote process. */
|
|
|
558 public synchronized ReadResult readBytesFromProcess(long address,
|
|
|
559 long numBytes) throws UnmappedAddressException, DebuggerException {
|
|
|
560 requireAttach();
|
|
|
561 if (isCore) {
|
|
|
562 byte[] res = readBytesFromProcess0(address, numBytes);
|
|
|
563 return (res != null)? new ReadResult(res) : new ReadResult(address);
|
|
|
564 } else {
|
|
|
565 class ReadBytesFromProcessTask implements WorkerThreadTask {
|
|
|
566 long address, numBytes;
|
|
|
567 ReadResult result;
|
|
|
568 public void doit(BsdDebuggerLocal debugger) {
|
|
|
569 byte[] res = debugger.readBytesFromProcess0(address, numBytes);
|
|
|
570 if (res != null)
|
|
|
571 result = new ReadResult(res);
|
|
|
572 else
|
|
|
573 result = new ReadResult(address);
|
|
|
574 }
|
|
|
575 }
|
|
|
576
|
|
|
577 ReadBytesFromProcessTask task = new ReadBytesFromProcessTask();
|
|
|
578 task.address = address;
|
|
|
579 task.numBytes = numBytes;
|
|
|
580 workerThread.execute(task);
|
|
|
581 return task.result;
|
|
|
582 }
|
|
|
583 }
|
|
|
584
|
|
|
585 public void writeBytesToProcess(long address, long numBytes, byte[] data)
|
|
|
586 throws UnmappedAddressException, DebuggerException {
|
|
|
587 // FIXME
|
|
|
588 throw new DebuggerException("Unimplemented");
|
|
|
589 }
|
|
|
590
|
|
|
591 static {
|
|
|
592 System.loadLibrary("saproc");
|
|
|
593 init0();
|
|
|
594 }
|
|
|
595 }
|
