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1010
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1 /*
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2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * Copyright 2007, 2008 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 // do not include precompiled header file
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27 #include "incls/_os_linux_zero.cpp.incl"
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28
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29 address os::current_stack_pointer() {
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30 address dummy = (address) &dummy;
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31 return dummy;
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32 }
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33
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34 frame os::get_sender_for_C_frame(frame* fr) {
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35 ShouldNotCallThis();
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36 }
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37
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38 frame os::current_frame() {
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39 // The only thing that calls this is the stack printing code in
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40 // VMError::report:
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41 // - Step 110 (printing stack bounds) uses the sp in the frame
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42 // to determine the amount of free space on the stack. We
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43 // set the sp to a close approximation of the real value in
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44 // order to allow this step to complete.
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45 // - Step 120 (printing native stack) tries to walk the stack.
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46 // The frame we create has a NULL pc, which is ignored as an
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47 // invalid frame.
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48 frame dummy = frame();
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49 dummy.set_sp((intptr_t *) current_stack_pointer());
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50 return dummy;
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51 }
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52
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53 char* os::non_memory_address_word() {
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54 // Must never look like an address returned by reserve_memory,
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55 // even in its subfields (as defined by the CPU immediate fields,
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56 // if the CPU splits constants across multiple instructions).
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57 #ifdef SPARC
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58 // On SPARC, 0 != %hi(any real address), because there is no
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59 // allocation in the first 1Kb of the virtual address space.
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60 return (char *) 0;
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61 #else
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62 // This is the value for x86; works pretty well for PPC too.
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63 return (char *) -1;
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64 #endif // SPARC
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65 }
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66
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67 void os::initialize_thread() {
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68 // Nothing to do.
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69 }
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70
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71 address os::Linux::ucontext_get_pc(ucontext_t* uc) {
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72 ShouldNotCallThis();
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73 }
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74
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75 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
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76 intptr_t** ret_sp,
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77 intptr_t** ret_fp) {
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78 ShouldNotCallThis();
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79 }
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80
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81 frame os::fetch_frame_from_context(void* ucVoid) {
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82 ShouldNotCallThis();
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83 }
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84
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85 extern "C" int
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86 JVM_handle_linux_signal(int sig,
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87 siginfo_t* info,
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88 void* ucVoid,
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89 int abort_if_unrecognized) {
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90 ucontext_t* uc = (ucontext_t*) ucVoid;
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91
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92 Thread* t = ThreadLocalStorage::get_thread_slow();
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93
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94 SignalHandlerMark shm(t);
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95
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96 // Note: it's not uncommon that JNI code uses signal/sigset to
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97 // install then restore certain signal handler (e.g. to temporarily
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98 // block SIGPIPE, or have a SIGILL handler when detecting CPU
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99 // type). When that happens, JVM_handle_linux_signal() might be
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100 // invoked with junk info/ucVoid. To avoid unnecessary crash when
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101 // libjsig is not preloaded, try handle signals that do not require
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102 // siginfo/ucontext first.
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103
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104 if (sig == SIGPIPE || sig == SIGXFSZ) {
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105 // allow chained handler to go first
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106 if (os::Linux::chained_handler(sig, info, ucVoid)) {
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107 return true;
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108 } else {
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109 if (PrintMiscellaneous && (WizardMode || Verbose)) {
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110 char buf[64];
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111 warning("Ignoring %s - see bugs 4229104 or 646499219",
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112 os::exception_name(sig, buf, sizeof(buf)));
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113 }
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114 return true;
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115 }
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116 }
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117
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118 JavaThread* thread = NULL;
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119 VMThread* vmthread = NULL;
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120 if (os::Linux::signal_handlers_are_installed) {
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121 if (t != NULL ){
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122 if(t->is_Java_thread()) {
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123 thread = (JavaThread*)t;
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124 }
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125 else if(t->is_VM_thread()){
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126 vmthread = (VMThread *)t;
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127 }
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128 }
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129 }
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130
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131 if (info != NULL && thread != NULL) {
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132 // Handle ALL stack overflow variations here
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133 if (sig == SIGSEGV) {
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134 address addr = (address) info->si_addr;
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135
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136 // check if fault address is within thread stack
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137 if (addr < thread->stack_base() &&
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138 addr >= thread->stack_base() - thread->stack_size()) {
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139 // stack overflow
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140 if (thread->in_stack_yellow_zone(addr)) {
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141 thread->disable_stack_yellow_zone();
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142 ShouldNotCallThis();
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143 }
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144 else if (thread->in_stack_red_zone(addr)) {
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145 thread->disable_stack_red_zone();
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146 ShouldNotCallThis();
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147 }
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148 else {
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149 // Accessing stack address below sp may cause SEGV if
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150 // current thread has MAP_GROWSDOWN stack. This should
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151 // only happen when current thread was created by user
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152 // code with MAP_GROWSDOWN flag and then attached to VM.
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153 // See notes in os_linux.cpp.
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154 if (thread->osthread()->expanding_stack() == 0) {
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155 thread->osthread()->set_expanding_stack();
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156 if (os::Linux::manually_expand_stack(thread, addr)) {
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157 thread->osthread()->clear_expanding_stack();
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158 return true;
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159 }
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160 thread->osthread()->clear_expanding_stack();
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161 }
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162 else {
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163 fatal("recursive segv. expanding stack.");
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164 }
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165 }
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166 }
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167 }
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168
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169 /*if (thread->thread_state() == _thread_in_Java) {
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170 ShouldNotCallThis();
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171 }
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172 else*/ if (thread->thread_state() == _thread_in_vm &&
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173 sig == SIGBUS && thread->doing_unsafe_access()) {
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174 ShouldNotCallThis();
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175 }
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176
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177 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC
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178 // kicks in and the heap gets shrunk before the field access.
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179 /*if (sig == SIGSEGV || sig == SIGBUS) {
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180 address addr = JNI_FastGetField::find_slowcase_pc(pc);
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181 if (addr != (address)-1) {
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182 stub = addr;
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183 }
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184 }*/
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185
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186 // Check to see if we caught the safepoint code in the process
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187 // of write protecting the memory serialization page. It write
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188 // enables the page immediately after protecting it so we can
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189 // just return to retry the write.
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190 if (sig == SIGSEGV &&
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191 os::is_memory_serialize_page(thread, (address) info->si_addr)) {
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192 // Block current thread until permission is restored.
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193 os::block_on_serialize_page_trap();
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194 return true;
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195 }
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196 }
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197
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198 // signal-chaining
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199 if (os::Linux::chained_handler(sig, info, ucVoid)) {
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200 return true;
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201 }
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202
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203 if (!abort_if_unrecognized) {
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204 // caller wants another chance, so give it to him
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205 return false;
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206 }
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207
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208 #ifndef PRODUCT
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209 if (sig == SIGSEGV) {
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210 fatal("\n#"
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211 "\n# /--------------------\\"
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212 "\n# | segmentation fault |"
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213 "\n# \\---\\ /--------------/"
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214 "\n# /"
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215 "\n# [-] |\\_/| "
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216 "\n# (+)=C |o o|__ "
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217 "\n# | | =-*-=__\\ "
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218 "\n# OOO c_c_(___)");
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219 }
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220 #endif // !PRODUCT
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221
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222 const char *fmt = "caught unhandled signal %d";
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223 char buf[64];
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224
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225 sprintf(buf, fmt, sig);
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226 fatal(buf);
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227 }
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228
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229 void os::Linux::init_thread_fpu_state(void) {
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230 // Nothing to do
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231 }
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232
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233 int os::Linux::get_fpu_control_word() {
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234 ShouldNotCallThis();
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235 }
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236
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237 void os::Linux::set_fpu_control_word(int fpu) {
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238 ShouldNotCallThis();
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239 }
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240
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241 bool os::is_allocatable(size_t bytes) {
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242 ShouldNotCallThis();
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243 }
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244
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245 ///////////////////////////////////////////////////////////////////////////////
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246 // thread stack
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247
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248 size_t os::Linux::min_stack_allowed = 64 * K;
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249
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250 bool os::Linux::supports_variable_stack_size() {
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251 return true;
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252 }
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253
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254 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
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255 #ifdef _LP64
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256 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
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257 #else
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258 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
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259 #endif // _LP64
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260 return s;
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261 }
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262
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263 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
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264 // Only enable glibc guard pages for non-Java threads
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265 // (Java threads have HotSpot guard pages)
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266 return (thr_type == java_thread ? 0 : page_size());
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267 }
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268
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269 static void current_stack_region(address *bottom, size_t *size) {
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270 pthread_attr_t attr;
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271 int res = pthread_getattr_np(pthread_self(), &attr);
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272 if (res != 0) {
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273 if (res == ENOMEM) {
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274 vm_exit_out_of_memory(0, "pthread_getattr_np");
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275 }
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276 else {
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277 fatal1("pthread_getattr_np failed with errno = %d", res);
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278 }
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279 }
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280
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281 address stack_bottom;
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282 size_t stack_bytes;
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283 res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes);
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284 if (res != 0) {
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285 fatal1("pthread_attr_getstack failed with errno = %d", res);
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286 }
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287 address stack_top = stack_bottom + stack_bytes;
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288
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289 // The block of memory returned by pthread_attr_getstack() includes
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290 // guard pages where present. We need to trim these off.
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291 size_t page_bytes = os::Linux::page_size();
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292 assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack");
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293
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294 size_t guard_bytes;
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295 res = pthread_attr_getguardsize(&attr, &guard_bytes);
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296 if (res != 0) {
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297 fatal1("pthread_attr_getguardsize failed with errno = %d", res);
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298 }
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299 int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes;
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300 assert(guard_bytes == guard_pages * page_bytes, "unaligned guard");
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301
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302 #ifdef IA64
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303 // IA64 has two stacks sharing the same area of memory, a normal
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304 // stack growing downwards and a register stack growing upwards.
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305 // Guard pages, if present, are in the centre. This code splits
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306 // the stack in two even without guard pages, though in theory
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307 // there's nothing to stop us allocating more to the normal stack
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308 // or more to the register stack if one or the other were found
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309 // to grow faster.
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310 int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes;
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311 stack_bottom += (total_pages - guard_pages) / 2 * page_bytes;
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312 #endif // IA64
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313
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314 stack_bottom += guard_bytes;
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315
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316 pthread_attr_destroy(&attr);
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317
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318 // The initial thread has a growable stack, and the size reported
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319 // by pthread_attr_getstack is the maximum size it could possibly
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320 // be given what currently mapped. This can be huge, so we cap it.
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321 if (os::Linux::is_initial_thread()) {
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322 stack_bytes = stack_top - stack_bottom;
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323
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324 if (stack_bytes > JavaThread::stack_size_at_create())
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325 stack_bytes = JavaThread::stack_size_at_create();
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326
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327 stack_bottom = stack_top - stack_bytes;
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328 }
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329
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330 assert(os::current_stack_pointer() >= stack_bottom, "should do");
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331 assert(os::current_stack_pointer() < stack_top, "should do");
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332
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333 *bottom = stack_bottom;
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334 *size = stack_top - stack_bottom;
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335 }
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336
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337 address os::current_stack_base() {
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338 address bottom;
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339 size_t size;
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340 current_stack_region(&bottom, &size);
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341 return bottom + size;
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342 }
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343
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344 size_t os::current_stack_size() {
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345 // stack size includes normal stack and HotSpot guard pages
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346 address bottom;
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347 size_t size;
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348 current_stack_region(&bottom, &size);
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349 return size;
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350 }
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351
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352 /////////////////////////////////////////////////////////////////////////////
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353 // helper functions for fatal error handler
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354
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355 void os::print_context(outputStream* st, void* context) {
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356 ShouldNotCallThis();
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357 }
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358
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359 /////////////////////////////////////////////////////////////////////////////
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360 // Stubs for things that would be in linux_zero.s if it existed.
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361 // You probably want to disassemble these monkeys to check they're ok.
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362
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363 extern "C" {
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364 int SpinPause() {
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365 }
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366
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367 int SafeFetch32(int *adr, int errValue) {
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368 int value = errValue;
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369 value = *adr;
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370 return value;
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371 }
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372 intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) {
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373 intptr_t value = errValue;
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374 value = *adr;
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375 return value;
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376 }
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377
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378 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
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379 if (from > to) {
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380 jshort *end = from + count;
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381 while (from < end)
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382 *(to++) = *(from++);
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383 }
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384 else if (from < to) {
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385 jshort *end = from;
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386 from += count - 1;
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387 to += count - 1;
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388 while (from >= end)
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389 *(to--) = *(from--);
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390 }
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391 }
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392 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
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393 if (from > to) {
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394 jint *end = from + count;
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395 while (from < end)
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396 *(to++) = *(from++);
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397 }
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398 else if (from < to) {
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399 jint *end = from;
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400 from += count - 1;
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401 to += count - 1;
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402 while (from >= end)
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403 *(to--) = *(from--);
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404 }
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405 }
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406 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
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407 if (from > to) {
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408 jlong *end = from + count;
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409 while (from < end)
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410 os::atomic_copy64(from++, to++);
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411 }
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412 else if (from < to) {
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413 jlong *end = from;
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414 from += count - 1;
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415 to += count - 1;
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416 while (from >= end)
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417 os::atomic_copy64(from--, to--);
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418 }
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419 }
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420
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421 void _Copy_arrayof_conjoint_bytes(HeapWord* from,
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422 HeapWord* to,
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423 size_t count) {
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424 ShouldNotCallThis();
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425 }
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426 void _Copy_arrayof_conjoint_jshorts(HeapWord* from,
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427 HeapWord* to,
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428 size_t count) {
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429 ShouldNotCallThis();
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430 }
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431 void _Copy_arrayof_conjoint_jints(HeapWord* from,
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432 HeapWord* to,
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433 size_t count) {
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434 ShouldNotCallThis();
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435 }
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436 void _Copy_arrayof_conjoint_jlongs(HeapWord* from,
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437 HeapWord* to,
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438 size_t count) {
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439 ShouldNotCallThis();
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440 }
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441 };
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442
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443 /////////////////////////////////////////////////////////////////////////////
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444 // Implementations of atomic operations not supported by processors.
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445 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html
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446
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447 #ifndef _LP64
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448 extern "C" {
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449 long long unsigned int __sync_val_compare_and_swap_8(
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450 volatile void *ptr,
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451 long long unsigned int oldval,
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452 long long unsigned int newval) {
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453 ShouldNotCallThis();
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454 }
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455 };
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456 #endif // !_LP64
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