3960
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1 /*
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2 * Copyright (c) 2003, 2011, 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 #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) && !defined(__NetBSD__)
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27 #include <pthread.h>
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28 # include <pthread_np.h> /* For pthread_attr_get_np */
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29 #endif
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30
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31 // no precompiled headers
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32 #include "assembler_zero.inline.hpp"
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33 #include "classfile/classLoader.hpp"
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34 #include "classfile/systemDictionary.hpp"
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35 #include "classfile/vmSymbols.hpp"
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36 #include "code/icBuffer.hpp"
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37 #include "code/vtableStubs.hpp"
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38 #include "interpreter/interpreter.hpp"
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39 #include "jvm_bsd.h"
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40 #include "memory/allocation.inline.hpp"
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41 #include "mutex_bsd.inline.hpp"
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42 #include "nativeInst_zero.hpp"
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43 #include "os_share_bsd.hpp"
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44 #include "prims/jniFastGetField.hpp"
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45 #include "prims/jvm.h"
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46 #include "prims/jvm_misc.hpp"
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47 #include "runtime/arguments.hpp"
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48 #include "runtime/extendedPC.hpp"
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49 #include "runtime/frame.inline.hpp"
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50 #include "runtime/interfaceSupport.hpp"
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51 #include "runtime/java.hpp"
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52 #include "runtime/javaCalls.hpp"
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53 #include "runtime/mutexLocker.hpp"
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54 #include "runtime/osThread.hpp"
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55 #include "runtime/sharedRuntime.hpp"
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56 #include "runtime/stubRoutines.hpp"
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57 #include "runtime/timer.hpp"
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58 #include "thread_bsd.inline.hpp"
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59 #include "utilities/events.hpp"
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60 #include "utilities/vmError.hpp"
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61 #ifdef COMPILER1
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62 #include "c1/c1_Runtime1.hpp"
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63 #endif
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64 #ifdef COMPILER2
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65 #include "opto/runtime.hpp"
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66 #endif
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67
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68 address os::current_stack_pointer() {
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69 address dummy = (address) &dummy;
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70 return dummy;
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71 }
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72
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73 frame os::get_sender_for_C_frame(frame* fr) {
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74 ShouldNotCallThis();
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75 }
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76
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77 frame os::current_frame() {
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78 // The only thing that calls this is the stack printing code in
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79 // VMError::report:
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80 // - Step 110 (printing stack bounds) uses the sp in the frame
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81 // to determine the amount of free space on the stack. We
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82 // set the sp to a close approximation of the real value in
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83 // order to allow this step to complete.
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84 // - Step 120 (printing native stack) tries to walk the stack.
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85 // The frame we create has a NULL pc, which is ignored as an
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86 // invalid frame.
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87 frame dummy = frame();
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88 dummy.set_sp((intptr_t *) current_stack_pointer());
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89 return dummy;
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90 }
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91
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92 char* os::non_memory_address_word() {
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93 // Must never look like an address returned by reserve_memory,
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94 // even in its subfields (as defined by the CPU immediate fields,
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95 // if the CPU splits constants across multiple instructions).
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96 #ifdef SPARC
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97 // On SPARC, 0 != %hi(any real address), because there is no
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98 // allocation in the first 1Kb of the virtual address space.
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99 return (char *) 0;
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100 #else
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101 // This is the value for x86; works pretty well for PPC too.
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102 return (char *) -1;
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103 #endif // SPARC
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104 }
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105
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106 void os::initialize_thread() {
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107 // Nothing to do.
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108 }
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109
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110 address os::Bsd::ucontext_get_pc(ucontext_t* uc) {
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111 ShouldNotCallThis();
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112 }
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113
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114 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
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115 intptr_t** ret_sp,
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116 intptr_t** ret_fp) {
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117 ShouldNotCallThis();
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118 }
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119
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120 frame os::fetch_frame_from_context(void* ucVoid) {
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121 ShouldNotCallThis();
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122 }
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123
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124 extern "C" JNIEXPORT int
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125 JVM_handle_bsd_signal(int sig,
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126 siginfo_t* info,
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127 void* ucVoid,
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128 int abort_if_unrecognized) {
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129 ucontext_t* uc = (ucontext_t*) ucVoid;
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130
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131 Thread* t = ThreadLocalStorage::get_thread_slow();
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132
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133 SignalHandlerMark shm(t);
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134
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135 // Note: it's not uncommon that JNI code uses signal/sigset to
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136 // install then restore certain signal handler (e.g. to temporarily
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137 // block SIGPIPE, or have a SIGILL handler when detecting CPU
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138 // type). When that happens, JVM_handle_bsd_signal() might be
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139 // invoked with junk info/ucVoid. To avoid unnecessary crash when
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140 // libjsig is not preloaded, try handle signals that do not require
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141 // siginfo/ucontext first.
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142
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143 if (sig == SIGPIPE || sig == SIGXFSZ) {
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144 // allow chained handler to go first
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145 if (os::Bsd::chained_handler(sig, info, ucVoid)) {
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146 return true;
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147 } else {
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148 if (PrintMiscellaneous && (WizardMode || Verbose)) {
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149 char buf[64];
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150 warning("Ignoring %s - see bugs 4229104 or 646499219",
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151 os::exception_name(sig, buf, sizeof(buf)));
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152 }
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153 return true;
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154 }
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155 }
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156
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157 JavaThread* thread = NULL;
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158 VMThread* vmthread = NULL;
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159 if (os::Bsd::signal_handlers_are_installed) {
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160 if (t != NULL ){
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161 if(t->is_Java_thread()) {
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162 thread = (JavaThread*)t;
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163 }
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164 else if(t->is_VM_thread()){
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165 vmthread = (VMThread *)t;
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166 }
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167 }
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168 }
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169
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170 if (info != NULL && thread != NULL) {
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171 // Handle ALL stack overflow variations here
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172 if (sig == SIGSEGV) {
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173 address addr = (address) info->si_addr;
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174
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175 // check if fault address is within thread stack
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176 if (addr < thread->stack_base() &&
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177 addr >= thread->stack_base() - thread->stack_size()) {
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178 // stack overflow
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179 if (thread->in_stack_yellow_zone(addr)) {
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180 thread->disable_stack_yellow_zone();
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181 ShouldNotCallThis();
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182 }
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183 else if (thread->in_stack_red_zone(addr)) {
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184 thread->disable_stack_red_zone();
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185 ShouldNotCallThis();
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186 }
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187 #ifndef _ALLBSD_SOURCE
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188 else {
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189 // Accessing stack address below sp may cause SEGV if
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190 // current thread has MAP_GROWSDOWN stack. This should
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191 // only happen when current thread was created by user
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192 // code with MAP_GROWSDOWN flag and then attached to VM.
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193 // See notes in os_bsd.cpp.
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194 if (thread->osthread()->expanding_stack() == 0) {
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195 thread->osthread()->set_expanding_stack();
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196 if (os::Bsd::manually_expand_stack(thread, addr)) {
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197 thread->osthread()->clear_expanding_stack();
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198 return true;
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199 }
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200 thread->osthread()->clear_expanding_stack();
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201 }
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202 else {
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203 fatal("recursive segv. expanding stack.");
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204 }
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205 }
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206 #endif
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207 }
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208 }
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209
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210 /*if (thread->thread_state() == _thread_in_Java) {
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211 ShouldNotCallThis();
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212 }
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213 else*/ if (thread->thread_state() == _thread_in_vm &&
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214 sig == SIGBUS && thread->doing_unsafe_access()) {
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215 ShouldNotCallThis();
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216 }
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217
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218 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC
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219 // kicks in and the heap gets shrunk before the field access.
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220 /*if (sig == SIGSEGV || sig == SIGBUS) {
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221 address addr = JNI_FastGetField::find_slowcase_pc(pc);
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222 if (addr != (address)-1) {
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223 stub = addr;
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224 }
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225 }*/
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226
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227 // Check to see if we caught the safepoint code in the process
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228 // of write protecting the memory serialization page. It write
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229 // enables the page immediately after protecting it so we can
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230 // just return to retry the write.
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231 if (sig == SIGSEGV &&
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232 os::is_memory_serialize_page(thread, (address) info->si_addr)) {
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233 // Block current thread until permission is restored.
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234 os::block_on_serialize_page_trap();
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235 return true;
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236 }
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237 }
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238
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239 // signal-chaining
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240 if (os::Bsd::chained_handler(sig, info, ucVoid)) {
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241 return true;
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242 }
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243
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244 if (!abort_if_unrecognized) {
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245 // caller wants another chance, so give it to him
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246 return false;
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247 }
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248
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249 #ifndef PRODUCT
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250 if (sig == SIGSEGV) {
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251 fatal("\n#"
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252 "\n# /--------------------\\"
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253 "\n# | segmentation fault |"
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254 "\n# \\---\\ /--------------/"
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255 "\n# /"
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256 "\n# [-] |\\_/| "
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257 "\n# (+)=C |o o|__ "
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258 "\n# | | =-*-=__\\ "
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259 "\n# OOO c_c_(___)");
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260 }
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261 #endif // !PRODUCT
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262
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263 const char *fmt = "caught unhandled signal %d";
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264 char buf[64];
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265
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266 sprintf(buf, fmt, sig);
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267 fatal(buf);
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268 }
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269
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270 void os::Bsd::init_thread_fpu_state(void) {
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271 // Nothing to do
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272 }
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273
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274 #ifndef _ALLBSD_SOURCE
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275 int os::Bsd::get_fpu_control_word() {
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276 ShouldNotCallThis();
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277 }
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278
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279 void os::Bsd::set_fpu_control_word(int fpu) {
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280 ShouldNotCallThis();
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281 }
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282 #endif
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283
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284 bool os::is_allocatable(size_t bytes) {
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285 #ifdef _LP64
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286 return true;
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287 #else
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288 if (bytes < 2 * G) {
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289 return true;
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290 }
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291
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292 char* addr = reserve_memory(bytes, NULL);
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293
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294 if (addr != NULL) {
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295 release_memory(addr, bytes);
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296 }
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297
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298 return addr != NULL;
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299 #endif // _LP64
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300 }
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301
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302 ///////////////////////////////////////////////////////////////////////////////
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303 // thread stack
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304
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305 size_t os::Bsd::min_stack_allowed = 64 * K;
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306
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307 bool os::Bsd::supports_variable_stack_size() {
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308 return true;
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309 }
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310
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311 size_t os::Bsd::default_stack_size(os::ThreadType thr_type) {
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312 #ifdef _LP64
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313 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
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314 #else
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315 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
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316 #endif // _LP64
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317 return s;
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318 }
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319
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320 size_t os::Bsd::default_guard_size(os::ThreadType thr_type) {
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321 // Only enable glibc guard pages for non-Java threads
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322 // (Java threads have HotSpot guard pages)
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323 return (thr_type == java_thread ? 0 : page_size());
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324 }
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325
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326 static void current_stack_region(address *bottom, size_t *size) {
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327 address stack_bottom;
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328 address stack_top;
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329 size_t stack_bytes;
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330
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331 #ifdef __APPLE__
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332 pthread_t self = pthread_self();
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333 stack_top = (address) pthread_get_stackaddr_np(self);
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334 stack_bytes = pthread_get_stacksize_np(self);
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335 stack_bottom = stack_top - stack_bytes;
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336 #elif defined(__OpenBSD__)
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337 stack_t ss;
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338 int rslt = pthread_stackseg_np(pthread_self(), &ss);
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339
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340 if (rslt != 0)
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341 fatal(err_msg("pthread_stackseg_np failed with err = %d", rslt));
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342
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343 stack_top = (address) ss.ss_sp;
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344 stack_bytes = ss.ss_size;
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345 stack_bottom = stack_top - stack_bytes;
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346 #elif defined(_ALLBSD_SOURCE)
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347 pthread_attr_t attr;
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348
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349 int rslt = pthread_attr_init(&attr);
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350
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351 // JVM needs to know exact stack location, abort if it fails
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352 if (rslt != 0)
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353 fatal(err_msg("pthread_attr_init failed with err = %d", rslt));
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354
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355 rslt = pthread_attr_get_np(pthread_self(), &attr);
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356
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357 if (rslt != 0)
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358 fatal(err_msg("pthread_attr_get_np failed with err = %d", rslt));
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359
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360 if (pthread_attr_getstackaddr(&attr, (void **) &stack_bottom) != 0 ||
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361 pthread_attr_getstacksize(&attr, &stack_bytes) != 0) {
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362 fatal("Can not locate current stack attributes!");
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363 }
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364
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365 pthread_attr_destroy(&attr);
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366
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367 stack_top = stack_bottom + stack_bytes;
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368 #else /* Linux */
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369 pthread_attr_t attr;
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370 int res = pthread_getattr_np(pthread_self(), &attr);
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371 if (res != 0) {
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372 if (res == ENOMEM) {
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373 vm_exit_out_of_memory(0, "pthread_getattr_np");
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374 }
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375 else {
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376 fatal(err_msg("pthread_getattr_np failed with errno = %d", res));
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377 }
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378 }
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379
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380 res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes);
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381 if (res != 0) {
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382 fatal(err_msg("pthread_attr_getstack failed with errno = %d", res));
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383 }
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384 stack_top = stack_bottom + stack_bytes;
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385
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386 // The block of memory returned by pthread_attr_getstack() includes
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387 // guard pages where present. We need to trim these off.
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388 size_t page_bytes = os::Bsd::page_size();
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389 assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack");
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390
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391 size_t guard_bytes;
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392 res = pthread_attr_getguardsize(&attr, &guard_bytes);
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393 if (res != 0) {
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394 fatal(err_msg("pthread_attr_getguardsize failed with errno = %d", res));
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395 }
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396 int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes;
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397 assert(guard_bytes == guard_pages * page_bytes, "unaligned guard");
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398
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399 #ifdef IA64
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400 // IA64 has two stacks sharing the same area of memory, a normal
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401 // stack growing downwards and a register stack growing upwards.
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402 // Guard pages, if present, are in the centre. This code splits
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403 // the stack in two even without guard pages, though in theory
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404 // there's nothing to stop us allocating more to the normal stack
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405 // or more to the register stack if one or the other were found
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406 // to grow faster.
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407 int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes;
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408 stack_bottom += (total_pages - guard_pages) / 2 * page_bytes;
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409 #endif // IA64
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410
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411 stack_bottom += guard_bytes;
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412
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413 pthread_attr_destroy(&attr);
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414
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415 // The initial thread has a growable stack, and the size reported
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416 // by pthread_attr_getstack is the maximum size it could possibly
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417 // be given what currently mapped. This can be huge, so we cap it.
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418 if (os::Bsd::is_initial_thread()) {
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419 stack_bytes = stack_top - stack_bottom;
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420
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421 if (stack_bytes > JavaThread::stack_size_at_create())
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422 stack_bytes = JavaThread::stack_size_at_create();
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423
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424 stack_bottom = stack_top - stack_bytes;
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425 }
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426 #endif
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427
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428 assert(os::current_stack_pointer() >= stack_bottom, "should do");
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429 assert(os::current_stack_pointer() < stack_top, "should do");
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430
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431 *bottom = stack_bottom;
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432 *size = stack_top - stack_bottom;
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433 }
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434
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435 address os::current_stack_base() {
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436 address bottom;
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437 size_t size;
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438 current_stack_region(&bottom, &size);
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439 return bottom + size;
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440 }
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441
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442 size_t os::current_stack_size() {
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443 // stack size includes normal stack and HotSpot guard pages
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444 address bottom;
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445 size_t size;
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446 current_stack_region(&bottom, &size);
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447 return size;
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448 }
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449
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450 /////////////////////////////////////////////////////////////////////////////
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451 // helper functions for fatal error handler
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452
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453 void os::print_context(outputStream* st, void* context) {
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454 ShouldNotCallThis();
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455 }
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456
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457 void os::print_register_info(outputStream *st, void *context) {
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458 ShouldNotCallThis();
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459 }
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460
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461 /////////////////////////////////////////////////////////////////////////////
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462 // Stubs for things that would be in bsd_zero.s if it existed.
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463 // You probably want to disassemble these monkeys to check they're ok.
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464
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465 extern "C" {
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466 int SpinPause() {
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467 }
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468
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469 int SafeFetch32(int *adr, int errValue) {
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470 int value = errValue;
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471 value = *adr;
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472 return value;
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473 }
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474 intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) {
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475 intptr_t value = errValue;
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476 value = *adr;
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477 return value;
|
|
478 }
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|
479
|
|
480 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
|
|
481 if (from > to) {
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|
482 jshort *end = from + count;
|
|
483 while (from < end)
|
|
484 *(to++) = *(from++);
|
|
485 }
|
|
486 else if (from < to) {
|
|
487 jshort *end = from;
|
|
488 from += count - 1;
|
|
489 to += count - 1;
|
|
490 while (from >= end)
|
|
491 *(to--) = *(from--);
|
|
492 }
|
|
493 }
|
|
494 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
|
|
495 if (from > to) {
|
|
496 jint *end = from + count;
|
|
497 while (from < end)
|
|
498 *(to++) = *(from++);
|
|
499 }
|
|
500 else if (from < to) {
|
|
501 jint *end = from;
|
|
502 from += count - 1;
|
|
503 to += count - 1;
|
|
504 while (from >= end)
|
|
505 *(to--) = *(from--);
|
|
506 }
|
|
507 }
|
|
508 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
|
|
509 if (from > to) {
|
|
510 jlong *end = from + count;
|
|
511 while (from < end)
|
|
512 os::atomic_copy64(from++, to++);
|
|
513 }
|
|
514 else if (from < to) {
|
|
515 jlong *end = from;
|
|
516 from += count - 1;
|
|
517 to += count - 1;
|
|
518 while (from >= end)
|
|
519 os::atomic_copy64(from--, to--);
|
|
520 }
|
|
521 }
|
|
522
|
|
523 void _Copy_arrayof_conjoint_bytes(HeapWord* from,
|
|
524 HeapWord* to,
|
|
525 size_t count) {
|
|
526 memmove(to, from, count);
|
|
527 }
|
|
528 void _Copy_arrayof_conjoint_jshorts(HeapWord* from,
|
|
529 HeapWord* to,
|
|
530 size_t count) {
|
|
531 memmove(to, from, count * 2);
|
|
532 }
|
|
533 void _Copy_arrayof_conjoint_jints(HeapWord* from,
|
|
534 HeapWord* to,
|
|
535 size_t count) {
|
|
536 memmove(to, from, count * 4);
|
|
537 }
|
|
538 void _Copy_arrayof_conjoint_jlongs(HeapWord* from,
|
|
539 HeapWord* to,
|
|
540 size_t count) {
|
|
541 memmove(to, from, count * 8);
|
|
542 }
|
|
543 };
|
|
544
|
|
545 /////////////////////////////////////////////////////////////////////////////
|
|
546 // Implementations of atomic operations not supported by processors.
|
|
547 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html
|
|
548
|
|
549 #ifndef _LP64
|
|
550 extern "C" {
|
|
551 long long unsigned int __sync_val_compare_and_swap_8(
|
|
552 volatile void *ptr,
|
|
553 long long unsigned int oldval,
|
|
554 long long unsigned int newval) {
|
|
555 ShouldNotCallThis();
|
|
556 }
|
|
557 };
|
|
558 #endif // !_LP64
|