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1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 // no precompiled headers |
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27 #include "assembler_zero.inline.hpp" |
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28 #include "classfile/classLoader.hpp" |
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29 #include "classfile/systemDictionary.hpp" |
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30 #include "classfile/vmSymbols.hpp" |
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31 #include "code/icBuffer.hpp" |
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32 #include "code/vtableStubs.hpp" |
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33 #include "interpreter/interpreter.hpp" |
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34 #include "jvm_linux.h" |
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35 #include "memory/allocation.inline.hpp" |
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36 #include "mutex_linux.inline.hpp" |
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37 #include "nativeInst_zero.hpp" |
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38 #include "os_share_linux.hpp" |
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39 #include "prims/jniFastGetField.hpp" |
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40 #include "prims/jvm.h" |
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41 #include "prims/jvm_misc.hpp" |
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42 #include "runtime/arguments.hpp" |
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43 #include "runtime/extendedPC.hpp" |
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44 #include "runtime/frame.inline.hpp" |
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45 #include "runtime/interfaceSupport.hpp" |
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46 #include "runtime/java.hpp" |
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47 #include "runtime/javaCalls.hpp" |
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48 #include "runtime/mutexLocker.hpp" |
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49 #include "runtime/osThread.hpp" |
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50 #include "runtime/sharedRuntime.hpp" |
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51 #include "runtime/stubRoutines.hpp" |
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52 #include "runtime/thread.inline.hpp" |
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53 #include "runtime/timer.hpp" |
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54 #include "utilities/events.hpp" |
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55 #include "utilities/vmError.hpp" |
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56 |
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57 address os::current_stack_pointer() { |
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58 address dummy = (address) &dummy; |
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59 return dummy; |
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60 } |
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61 |
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62 frame os::get_sender_for_C_frame(frame* fr) { |
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63 ShouldNotCallThis(); |
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64 } |
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65 |
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66 frame os::current_frame() { |
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67 // The only thing that calls this is the stack printing code in |
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68 // VMError::report: |
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69 // - Step 110 (printing stack bounds) uses the sp in the frame |
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70 // to determine the amount of free space on the stack. We |
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71 // set the sp to a close approximation of the real value in |
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72 // order to allow this step to complete. |
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73 // - Step 120 (printing native stack) tries to walk the stack. |
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74 // The frame we create has a NULL pc, which is ignored as an |
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75 // invalid frame. |
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76 frame dummy = frame(); |
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77 dummy.set_sp((intptr_t *) current_stack_pointer()); |
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78 return dummy; |
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79 } |
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80 |
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81 char* os::non_memory_address_word() { |
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82 // Must never look like an address returned by reserve_memory, |
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83 // even in its subfields (as defined by the CPU immediate fields, |
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84 // if the CPU splits constants across multiple instructions). |
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85 #ifdef SPARC |
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86 // On SPARC, 0 != %hi(any real address), because there is no |
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87 // allocation in the first 1Kb of the virtual address space. |
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88 return (char *) 0; |
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89 #else |
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90 // This is the value for x86; works pretty well for PPC too. |
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91 return (char *) -1; |
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92 #endif // SPARC |
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93 } |
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94 |
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95 void os::initialize_thread(Thread * thr){ |
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96 // Nothing to do. |
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97 } |
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98 |
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99 address os::Linux::ucontext_get_pc(ucontext_t* uc) { |
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100 ShouldNotCallThis(); |
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101 } |
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102 |
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103 ExtendedPC os::fetch_frame_from_context(void* ucVoid, |
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104 intptr_t** ret_sp, |
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105 intptr_t** ret_fp) { |
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106 ShouldNotCallThis(); |
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107 } |
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108 |
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109 frame os::fetch_frame_from_context(void* ucVoid) { |
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110 ShouldNotCallThis(); |
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111 } |
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112 |
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113 extern "C" JNIEXPORT int |
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114 JVM_handle_linux_signal(int sig, |
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115 siginfo_t* info, |
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116 void* ucVoid, |
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117 int abort_if_unrecognized) { |
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118 ucontext_t* uc = (ucontext_t*) ucVoid; |
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119 |
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120 Thread* t = ThreadLocalStorage::get_thread_slow(); |
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121 |
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122 SignalHandlerMark shm(t); |
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123 |
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124 // Note: it's not uncommon that JNI code uses signal/sigset to |
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125 // install then restore certain signal handler (e.g. to temporarily |
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126 // block SIGPIPE, or have a SIGILL handler when detecting CPU |
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127 // type). When that happens, JVM_handle_linux_signal() might be |
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128 // invoked with junk info/ucVoid. To avoid unnecessary crash when |
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129 // libjsig is not preloaded, try handle signals that do not require |
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130 // siginfo/ucontext first. |
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131 |
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132 if (sig == SIGPIPE || sig == SIGXFSZ) { |
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133 // allow chained handler to go first |
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134 if (os::Linux::chained_handler(sig, info, ucVoid)) { |
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135 return true; |
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136 } else { |
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137 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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138 char buf[64]; |
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139 warning("Ignoring %s - see bugs 4229104 or 646499219", |
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140 os::exception_name(sig, buf, sizeof(buf))); |
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141 } |
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142 return true; |
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143 } |
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144 } |
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145 |
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146 JavaThread* thread = NULL; |
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147 VMThread* vmthread = NULL; |
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148 if (os::Linux::signal_handlers_are_installed) { |
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149 if (t != NULL ){ |
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150 if(t->is_Java_thread()) { |
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151 thread = (JavaThread*)t; |
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152 } |
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153 else if(t->is_VM_thread()){ |
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154 vmthread = (VMThread *)t; |
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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 if (info != NULL && thread != NULL) { |
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160 // Handle ALL stack overflow variations here |
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161 if (sig == SIGSEGV) { |
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162 address addr = (address) info->si_addr; |
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163 |
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164 // check if fault address is within thread stack |
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165 if (addr < thread->stack_base() && |
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166 addr >= thread->stack_base() - thread->stack_size()) { |
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167 // stack overflow |
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168 if (thread->in_stack_yellow_zone(addr)) { |
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169 thread->disable_stack_yellow_zone(); |
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170 ShouldNotCallThis(); |
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171 } |
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172 else if (thread->in_stack_red_zone(addr)) { |
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173 thread->disable_stack_red_zone(); |
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174 ShouldNotCallThis(); |
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175 } |
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176 else { |
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177 // Accessing stack address below sp may cause SEGV if |
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178 // current thread has MAP_GROWSDOWN stack. This should |
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179 // only happen when current thread was created by user |
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180 // code with MAP_GROWSDOWN flag and then attached to VM. |
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181 // See notes in os_linux.cpp. |
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182 if (thread->osthread()->expanding_stack() == 0) { |
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183 thread->osthread()->set_expanding_stack(); |
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184 if (os::Linux::manually_expand_stack(thread, addr)) { |
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185 thread->osthread()->clear_expanding_stack(); |
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186 return true; |
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187 } |
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188 thread->osthread()->clear_expanding_stack(); |
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189 } |
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190 else { |
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191 fatal("recursive segv. expanding stack."); |
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192 } |
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193 } |
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194 } |
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195 } |
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196 |
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197 /*if (thread->thread_state() == _thread_in_Java) { |
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198 ShouldNotCallThis(); |
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199 } |
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200 else*/ if (thread->thread_state() == _thread_in_vm && |
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201 sig == SIGBUS && thread->doing_unsafe_access()) { |
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202 ShouldNotCallThis(); |
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203 } |
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204 |
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205 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC |
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206 // kicks in and the heap gets shrunk before the field access. |
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207 /*if (sig == SIGSEGV || sig == SIGBUS) { |
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208 address addr = JNI_FastGetField::find_slowcase_pc(pc); |
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209 if (addr != (address)-1) { |
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210 stub = addr; |
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211 } |
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212 }*/ |
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213 |
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214 // Check to see if we caught the safepoint code in the process |
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215 // of write protecting the memory serialization page. It write |
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216 // enables the page immediately after protecting it so we can |
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217 // just return to retry the write. |
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218 if (sig == SIGSEGV && |
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219 os::is_memory_serialize_page(thread, (address) info->si_addr)) { |
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220 // Block current thread until permission is restored. |
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221 os::block_on_serialize_page_trap(); |
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222 return true; |
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223 } |
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224 } |
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225 |
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226 // signal-chaining |
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227 if (os::Linux::chained_handler(sig, info, ucVoid)) { |
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228 return true; |
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229 } |
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230 |
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231 if (!abort_if_unrecognized) { |
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232 // caller wants another chance, so give it to him |
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233 return false; |
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234 } |
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235 |
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236 #ifndef PRODUCT |
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237 if (sig == SIGSEGV) { |
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238 fatal("\n#" |
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239 "\n# /--------------------\\" |
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240 "\n# | segmentation fault |" |
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241 "\n# \\---\\ /--------------/" |
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242 "\n# /" |
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243 "\n# [-] |\\_/| " |
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244 "\n# (+)=C |o o|__ " |
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245 "\n# | | =-*-=__\\ " |
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246 "\n# OOO c_c_(___)"); |
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247 } |
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248 #endif // !PRODUCT |
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249 |
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250 const char *fmt = "caught unhandled signal %d"; |
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251 char buf[64]; |
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252 |
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253 sprintf(buf, fmt, sig); |
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254 fatal(buf); |
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255 } |
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256 |
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257 void os::Linux::init_thread_fpu_state(void) { |
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258 // Nothing to do |
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259 } |
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260 |
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261 int os::Linux::get_fpu_control_word() { |
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262 ShouldNotCallThis(); |
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263 } |
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264 |
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265 void os::Linux::set_fpu_control_word(int fpu) { |
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266 ShouldNotCallThis(); |
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267 } |
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268 |
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269 bool os::is_allocatable(size_t bytes) { |
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270 #ifdef _LP64 |
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271 return true; |
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272 #else |
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273 if (bytes < 2 * G) { |
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274 return true; |
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275 } |
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276 |
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277 char* addr = reserve_memory(bytes, NULL); |
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278 |
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279 if (addr != NULL) { |
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280 release_memory(addr, bytes); |
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281 } |
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282 |
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283 return addr != NULL; |
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284 #endif // _LP64 |
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285 } |
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286 |
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287 /////////////////////////////////////////////////////////////////////////////// |
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288 // thread stack |
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289 |
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290 size_t os::Linux::min_stack_allowed = 64 * K; |
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291 |
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292 bool os::Linux::supports_variable_stack_size() { |
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293 return true; |
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294 } |
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295 |
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296 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { |
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297 #ifdef _LP64 |
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298 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); |
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299 #else |
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300 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); |
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301 #endif // _LP64 |
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302 return s; |
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303 } |
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304 |
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305 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { |
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306 // Only enable glibc guard pages for non-Java threads |
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307 // (Java threads have HotSpot guard pages) |
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308 return (thr_type == java_thread ? 0 : page_size()); |
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309 } |
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310 |
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311 static void current_stack_region(address *bottom, size_t *size) { |
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312 pthread_attr_t attr; |
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313 int res = pthread_getattr_np(pthread_self(), &attr); |
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314 if (res != 0) { |
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315 if (res == ENOMEM) { |
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316 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); |
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317 } |
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318 else { |
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319 fatal(err_msg("pthread_getattr_np failed with errno = %d", res)); |
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320 } |
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321 } |
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322 |
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323 address stack_bottom; |
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324 size_t stack_bytes; |
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325 res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes); |
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326 if (res != 0) { |
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327 fatal(err_msg("pthread_attr_getstack failed with errno = %d", res)); |
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328 } |
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329 address stack_top = stack_bottom + stack_bytes; |
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330 |
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331 // The block of memory returned by pthread_attr_getstack() includes |
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332 // guard pages where present. We need to trim these off. |
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333 size_t page_bytes = os::Linux::page_size(); |
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334 assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack"); |
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335 |
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336 size_t guard_bytes; |
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337 res = pthread_attr_getguardsize(&attr, &guard_bytes); |
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338 if (res != 0) { |
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339 fatal(err_msg("pthread_attr_getguardsize failed with errno = %d", res)); |
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340 } |
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341 int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes; |
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342 assert(guard_bytes == guard_pages * page_bytes, "unaligned guard"); |
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343 |
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344 #ifdef IA64 |
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345 // IA64 has two stacks sharing the same area of memory, a normal |
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346 // stack growing downwards and a register stack growing upwards. |
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347 // Guard pages, if present, are in the centre. This code splits |
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348 // the stack in two even without guard pages, though in theory |
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349 // there's nothing to stop us allocating more to the normal stack |
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350 // or more to the register stack if one or the other were found |
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351 // to grow faster. |
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352 int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes; |
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353 stack_bottom += (total_pages - guard_pages) / 2 * page_bytes; |
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354 #endif // IA64 |
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355 |
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356 stack_bottom += guard_bytes; |
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357 |
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358 pthread_attr_destroy(&attr); |
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359 |
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360 // The initial thread has a growable stack, and the size reported |
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361 // by pthread_attr_getstack is the maximum size it could possibly |
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362 // be given what currently mapped. This can be huge, so we cap it. |
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363 if (os::Linux::is_initial_thread()) { |
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364 stack_bytes = stack_top - stack_bottom; |
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365 |
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366 if (stack_bytes > JavaThread::stack_size_at_create()) |
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367 stack_bytes = JavaThread::stack_size_at_create(); |
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368 |
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369 stack_bottom = stack_top - stack_bytes; |
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370 } |
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371 |
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372 assert(os::current_stack_pointer() >= stack_bottom, "should do"); |
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373 assert(os::current_stack_pointer() < stack_top, "should do"); |
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374 |
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375 *bottom = stack_bottom; |
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376 *size = stack_top - stack_bottom; |
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377 } |
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378 |
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379 address os::current_stack_base() { |
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380 address bottom; |
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381 size_t size; |
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382 current_stack_region(&bottom, &size); |
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383 return bottom + size; |
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384 } |
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385 |
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386 size_t os::current_stack_size() { |
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387 // stack size includes normal stack and HotSpot guard pages |
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388 address bottom; |
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389 size_t size; |
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390 current_stack_region(&bottom, &size); |
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391 return size; |
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392 } |
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393 |
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394 ///////////////////////////////////////////////////////////////////////////// |
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395 // helper functions for fatal error handler |
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396 |
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397 void os::print_context(outputStream* st, void* context) { |
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398 ShouldNotCallThis(); |
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399 } |
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400 |
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401 void os::print_register_info(outputStream *st, void *context) { |
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402 ShouldNotCallThis(); |
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403 } |
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404 |
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405 ///////////////////////////////////////////////////////////////////////////// |
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406 // Stubs for things that would be in linux_zero.s if it existed. |
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407 // You probably want to disassemble these monkeys to check they're ok. |
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408 |
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409 extern "C" { |
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410 int SpinPause() { |
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411 } |
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412 |
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413 |
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414 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { |
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415 if (from > to) { |
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416 jshort *end = from + count; |
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417 while (from < end) |
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418 *(to++) = *(from++); |
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419 } |
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420 else if (from < to) { |
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421 jshort *end = from; |
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422 from += count - 1; |
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423 to += count - 1; |
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424 while (from >= end) |
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425 *(to--) = *(from--); |
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426 } |
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427 } |
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428 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { |
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429 if (from > to) { |
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430 jint *end = from + count; |
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431 while (from < end) |
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432 *(to++) = *(from++); |
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433 } |
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434 else if (from < to) { |
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435 jint *end = from; |
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436 from += count - 1; |
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437 to += count - 1; |
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438 while (from >= end) |
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439 *(to--) = *(from--); |
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440 } |
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441 } |
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442 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { |
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443 if (from > to) { |
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444 jlong *end = from + count; |
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445 while (from < end) |
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446 os::atomic_copy64(from++, to++); |
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447 } |
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448 else if (from < to) { |
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449 jlong *end = from; |
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450 from += count - 1; |
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451 to += count - 1; |
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452 while (from >= end) |
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453 os::atomic_copy64(from--, to--); |
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454 } |
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455 } |
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456 |
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457 void _Copy_arrayof_conjoint_bytes(HeapWord* from, |
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458 HeapWord* to, |
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459 size_t count) { |
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460 memmove(to, from, count); |
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461 } |
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462 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, |
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463 HeapWord* to, |
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464 size_t count) { |
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465 memmove(to, from, count * 2); |
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466 } |
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467 void _Copy_arrayof_conjoint_jints(HeapWord* from, |
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468 HeapWord* to, |
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469 size_t count) { |
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470 memmove(to, from, count * 4); |
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471 } |
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472 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, |
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473 HeapWord* to, |
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474 size_t count) { |
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475 memmove(to, from, count * 8); |
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476 } |
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477 }; |
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478 |
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479 ///////////////////////////////////////////////////////////////////////////// |
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480 // Implementations of atomic operations not supported by processors. |
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481 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html |
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482 |
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483 #ifndef _LP64 |
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484 extern "C" { |
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485 long long unsigned int __sync_val_compare_and_swap_8( |
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486 volatile void *ptr, |
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487 long long unsigned int oldval, |
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488 long long unsigned int newval) { |
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489 ShouldNotCallThis(); |
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490 } |
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491 }; |
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492 #endif // !_LP64 |
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493 |
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494 #ifndef PRODUCT |
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495 void os::verify_stack_alignment() { |
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496 } |
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497 #endif |