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1 /*
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2 * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any 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.runtime.solaris_sparc;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.debugger.sparc.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.runtime.sparc.*;
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33 import sun.jvm.hotspot.types.*;
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34 import sun.jvm.hotspot.utilities.*;
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35
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36 public class SolarisSPARCJavaThreadPDAccess implements JavaThreadPDAccess {
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37 private static AddressField baseOfStackPointerField;
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38 private static AddressField postJavaStateField;
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39 private static AddressField osThreadField;
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40 private static int isPC;
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41 private static int hasFlushed;
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42
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43 // Field from OSThread
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44 private static CIntegerField osThreadThreadIDField;
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45
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46 static {
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47 VM.registerVMInitializedObserver(new Observer() {
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48 public void update(Observable o, Object data) {
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49 initialize(VM.getVM().getTypeDataBase());
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50 }
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51 });
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52 }
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53
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54 private static synchronized void initialize(TypeDataBase db) {
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55 Type type = db.lookupType("JavaThread");
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56 Type anchorType = db.lookupType("JavaFrameAnchor");
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57
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58 baseOfStackPointerField = type.getAddressField("_base_of_stack_pointer");
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59 osThreadField = type.getAddressField("_osthread");
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60 hasFlushed = db.lookupIntConstant("JavaFrameAnchor::flushed").intValue();
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61
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62 type = db.lookupType("OSThread");
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63 osThreadThreadIDField = type.getCIntegerField("_thread_id");
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64 }
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65
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66 public Address getLastJavaFP(Address addr) {
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67 return null;
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68
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69 }
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70
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71 public Address getLastJavaPC(Address addr) {
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72 return null;
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73 }
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74
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75 public Address getBaseOfStackPointer(Address addr) {
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76 return baseOfStackPointerField.getValue(addr);
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77 }
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78
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79 public Frame getLastFramePD(JavaThread thread, Address addr) {
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80
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81 // This assert doesn't work in the debugging case for threads
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82 // which are running Java code and which haven't re-entered the
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83 // runtime (e.g., through a Method.invoke() or otherwise). They
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84 // haven't yet "decached" their last Java stack pointer to the
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85 // thread.
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86
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87 // if (Assert.ASSERTS_ENABLED) {
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88 // Assert.that(hasLastJavaFrame(), "must have last_Java_sp() when suspended");
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89 // // FIXME: add assertion about flushing register windows for runtime system
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90 // // (not appropriate for debugging system, though, unless at safepoin t)
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91 // }
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92
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93 // FIXME: I don't think this is necessary, but might be useful
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94 // while debugging
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95 if (thread.getLastJavaSP() == null) {
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96 return null;
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97 }
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98
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99 // sparc does a lazy window flush. The _flags field of the JavaFrameAnchor
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100 // encodes whether the windows have flushed. Whenever the windows have flushed
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101 // there will be a last_Java_pc.
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102 // In a relective system we'd have to do something to force the thread to flush
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103 // its windows and give us the pc (or the younger_sp so we can find it ourselves)
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104 // In a debugger situation (process or core) the flush should have happened and
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105 // so if we don't have the younger sp we can find it
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106 //
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107 if (thread.getLastJavaPC() != null) {
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108 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), thread.getLastJavaPC());
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109 } else {
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110 Frame top = getCurrentFrameGuess(thread, addr);
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111 return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()),
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112 SPARCFrame.biasSP(SPARCFrame.findYoungerSP(top.getSP(), thread.getLastJavaSP())),
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113 false);
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114 }
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115
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116
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117 }
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118
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119 public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
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120 return new SPARCRegisterMap(thread, updateMap);
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121 }
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122
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123 public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {
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124 ThreadProxy t = getThreadProxy(addr);
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125 SPARCThreadContext context = (SPARCThreadContext) t.getContext();
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126 // For now, let's see what happens if we do a similar thing to
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127 // what the runtime code does. I suspect this may cause us to lose
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128 // the top frame from the stack.
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129 Address sp = context.getRegisterAsAddress(SPARCThreadContext.R_SP);
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130 Address pc = context.getRegisterAsAddress(SPARCThreadContext.R_PC);
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131
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132 if ((sp == null) || (pc == null)) {
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133 // Problems (have not hit this case so far, but would be bad to continue if we did)
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134 return null;
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135 }
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136
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137 return new SPARCFrame(sp, pc);
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138 }
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139
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140
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141 public void printThreadIDOn(Address addr, PrintStream tty) {
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142 tty.print(getThreadProxy(addr));
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143 }
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144
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145 public Address getLastSP(Address addr) {
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146 ThreadProxy t = getThreadProxy(addr);
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147 SPARCThreadContext context = (SPARCThreadContext) t.getContext();
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148 return SPARCFrame.unBiasSP(context.getRegisterAsAddress(SPARCThreadContext.R_SP));
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149 }
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150
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151 public void printInfoOn(Address threadAddr, PrintStream tty) {
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152 }
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153
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154 public ThreadProxy getThreadProxy(Address addr) {
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155 // Fetch the OSThread (for now and for simplicity, not making a
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156 // separate "OSThread" class in this package)
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157 Address osThreadAddr = osThreadField.getValue(addr);
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158 // Get the address of the thread ID from the OSThread
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159 Address tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());
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160
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161 JVMDebugger debugger = VM.getVM().getDebugger();
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162 return debugger.getThreadForIdentifierAddress(tidAddr);
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163 }
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164
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165
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166 }
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