1 /* 2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #if !defined(__APPLE__) && !defined(__NetBSD__) 27 #include <pthread.h> 28 # include <pthread_np.h> /* For pthread_attr_get_np */ 29 #endif 30 31 // no precompiled headers 32 #include "assembler_zero.inline.hpp" 33 #include "classfile/classLoader.hpp" 34 #include "classfile/systemDictionary.hpp" 35 #include "classfile/vmSymbols.hpp" 36 #include "code/icBuffer.hpp" 37 #include "code/vtableStubs.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "jvm_bsd.h" 40 #include "memory/allocation.inline.hpp" 41 #include "mutex_bsd.inline.hpp" 42 #include "nativeInst_zero.hpp" 43 #include "os_share_bsd.hpp" 44 #include "prims/jniFastGetField.hpp" 45 #include "prims/jvm.h" 46 #include "prims/jvm_misc.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/extendedPC.hpp" 49 #include "runtime/frame.inline.hpp" 50 #include "runtime/interfaceSupport.hpp" 51 #include "runtime/java.hpp" 52 #include "runtime/javaCalls.hpp" 53 #include "runtime/mutexLocker.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "runtime/stubRoutines.hpp" 57 #include "runtime/thread.inline.hpp" 58 #include "runtime/timer.hpp" 59 #include "utilities/events.hpp" 60 #include "utilities/vmError.hpp" 61 62 address os::current_stack_pointer() { 63 address dummy = (address) &dummy; 64 return dummy; 65 } 66 67 frame os::get_sender_for_C_frame(frame* fr) { 68 ShouldNotCallThis(); 69 } 70 71 frame os::current_frame() { 72 // The only thing that calls this is the stack printing code in 73 // VMError::report: 74 // - Step 110 (printing stack bounds) uses the sp in the frame 75 // to determine the amount of free space on the stack. We 76 // set the sp to a close approximation of the real value in 77 // order to allow this step to complete. 78 // - Step 120 (printing native stack) tries to walk the stack. 79 // The frame we create has a NULL pc, which is ignored as an 80 // invalid frame. 81 frame dummy = frame(); 82 dummy.set_sp((intptr_t *) current_stack_pointer()); 83 return dummy; 84 } 85 86 char* os::non_memory_address_word() { 87 // Must never look like an address returned by reserve_memory, 88 // even in its subfields (as defined by the CPU immediate fields, 89 // if the CPU splits constants across multiple instructions). 90 #ifdef SPARC 91 // On SPARC, 0 != %hi(any real address), because there is no 92 // allocation in the first 1Kb of the virtual address space. 93 return (char *) 0; 94 #else 95 // This is the value for x86; works pretty well for PPC too. 96 return (char *) -1; 97 #endif // SPARC 98 } 99 100 void os::initialize_thread(Thread* thr) { 101 // Nothing to do. 102 } 103 104 address os::Bsd::ucontext_get_pc(ucontext_t* uc) { 105 ShouldNotCallThis(); 106 } 107 108 ExtendedPC os::fetch_frame_from_context(void* ucVoid, 109 intptr_t** ret_sp, 110 intptr_t** ret_fp) { 111 ShouldNotCallThis(); 112 } 113 114 frame os::fetch_frame_from_context(void* ucVoid) { 115 ShouldNotCallThis(); 116 } 117 118 extern "C" JNIEXPORT int 119 JVM_handle_bsd_signal(int sig, 120 siginfo_t* info, 121 void* ucVoid, 122 int abort_if_unrecognized) { 123 ucontext_t* uc = (ucontext_t*) ucVoid; 124 125 Thread* t = ThreadLocalStorage::get_thread_slow(); 126 127 SignalHandlerMark shm(t); 128 129 // Note: it's not uncommon that JNI code uses signal/sigset to 130 // install then restore certain signal handler (e.g. to temporarily 131 // block SIGPIPE, or have a SIGILL handler when detecting CPU 132 // type). When that happens, JVM_handle_bsd_signal() might be 133 // invoked with junk info/ucVoid. To avoid unnecessary crash when 134 // libjsig is not preloaded, try handle signals that do not require 135 // siginfo/ucontext first. 136 137 if (sig == SIGPIPE || sig == SIGXFSZ) { 138 // allow chained handler to go first 139 if (os::Bsd::chained_handler(sig, info, ucVoid)) { 140 return true; 141 } else { 142 if (PrintMiscellaneous && (WizardMode || Verbose)) { 143 char buf[64]; 144 warning("Ignoring %s - see bugs 4229104 or 646499219", 145 os::exception_name(sig, buf, sizeof(buf))); 146 } 147 return true; 148 } 149 } 150 151 JavaThread* thread = NULL; 152 VMThread* vmthread = NULL; 153 if (os::Bsd::signal_handlers_are_installed) { 154 if (t != NULL ){ 155 if(t->is_Java_thread()) { 156 thread = (JavaThread*)t; 157 } 158 else if(t->is_VM_thread()){ 159 vmthread = (VMThread *)t; 160 } 161 } 162 } 163 164 if (info != NULL && thread != NULL) { 165 // Handle ALL stack overflow variations here 166 if (sig == SIGSEGV || sig == SIGBUS) { 167 address addr = (address) info->si_addr; 168 169 // check if fault address is within thread stack 170 if (addr < thread->stack_base() && 171 addr >= thread->stack_base() - thread->stack_size()) { 172 // stack overflow 173 if (thread->in_stack_yellow_zone(addr)) { 174 thread->disable_stack_yellow_zone(); 175 ShouldNotCallThis(); 176 } 177 else if (thread->in_stack_red_zone(addr)) { 178 thread->disable_stack_red_zone(); 179 ShouldNotCallThis(); 180 } 181 } 182 } 183 184 /*if (thread->thread_state() == _thread_in_Java) { 185 ShouldNotCallThis(); 186 } 187 else*/ if (thread->thread_state() == _thread_in_vm && 188 sig == SIGBUS && thread->doing_unsafe_access()) { 189 ShouldNotCallThis(); 190 } 191 192 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC 193 // kicks in and the heap gets shrunk before the field access. 194 /*if (sig == SIGSEGV || sig == SIGBUS) { 195 address addr = JNI_FastGetField::find_slowcase_pc(pc); 196 if (addr != (address)-1) { 197 stub = addr; 198 } 199 }*/ 200 201 // Check to see if we caught the safepoint code in the process 202 // of write protecting the memory serialization page. It write 203 // enables the page immediately after protecting it so we can 204 // just return to retry the write. 205 if ((sig == SIGSEGV || sig == SIGBUS) && 206 os::is_memory_serialize_page(thread, (address) info->si_addr)) { 207 // Block current thread until permission is restored. 208 os::block_on_serialize_page_trap(); 209 return true; 210 } 211 } 212 213 // signal-chaining 214 if (os::Bsd::chained_handler(sig, info, ucVoid)) { 215 return true; 216 } 217 218 if (!abort_if_unrecognized) { 219 // caller wants another chance, so give it to him 220 return false; 221 } 222 223 #ifndef PRODUCT 224 if (sig == SIGSEGV) { 225 fatal("\n#" 226 "\n# /--------------------\\" 227 "\n# | segmentation fault |" 228 "\n# \\---\\ /--------------/" 229 "\n# /" 230 "\n# [-] |\\_/| " 231 "\n# (+)=C |o o|__ " 232 "\n# | | =-*-=__\\ " 233 "\n# OOO c_c_(___)"); 234 } 235 #endif // !PRODUCT 236 237 const char *fmt = 238 "caught unhandled signal " INT32_FORMAT " at address " PTR_FORMAT; 239 char buf[128]; 240 241 sprintf(buf, fmt, sig, info->si_addr); 242 fatal(buf); 243 } 244 245 void os::Bsd::init_thread_fpu_state(void) { 246 // Nothing to do 247 } 248 249 bool os::is_allocatable(size_t bytes) { 250 #ifdef _LP64 251 return true; 252 #else 253 if (bytes < 2 * G) { 254 return true; 255 } 256 257 char* addr = reserve_memory(bytes, NULL); 258 259 if (addr != NULL) { 260 release_memory(addr, bytes); 261 } 262 263 return addr != NULL; 264 #endif // _LP64 265 } 266 267 /////////////////////////////////////////////////////////////////////////////// 268 // thread stack 269 270 size_t os::Bsd::min_stack_allowed = 64 * K; 271 272 bool os::Bsd::supports_variable_stack_size() { 273 return true; 274 } 275 276 size_t os::Bsd::default_stack_size(os::ThreadType thr_type) { 277 #ifdef _LP64 278 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 279 #else 280 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); 281 #endif // _LP64 282 return s; 283 } 284 285 size_t os::Bsd::default_guard_size(os::ThreadType thr_type) { 286 // Only enable glibc guard pages for non-Java threads 287 // (Java threads have HotSpot guard pages) 288 return (thr_type == java_thread ? 0 : page_size()); 289 } 290 291 static void current_stack_region(address *bottom, size_t *size) { 292 address stack_bottom; 293 address stack_top; 294 size_t stack_bytes; 295 296 #ifdef __APPLE__ 297 pthread_t self = pthread_self(); 298 stack_top = (address) pthread_get_stackaddr_np(self); 299 stack_bytes = pthread_get_stacksize_np(self); 300 stack_bottom = stack_top - stack_bytes; 301 #elif defined(__OpenBSD__) 302 stack_t ss; 303 int rslt = pthread_stackseg_np(pthread_self(), &ss); 304 305 if (rslt != 0) 306 fatal(err_msg("pthread_stackseg_np failed with err = " INT32_FORMAT, 307 rslt)); 308 309 stack_top = (address) ss.ss_sp; 310 stack_bytes = ss.ss_size; 311 stack_bottom = stack_top - stack_bytes; 312 #else 313 pthread_attr_t attr; 314 315 int rslt = pthread_attr_init(&attr); 316 317 // JVM needs to know exact stack location, abort if it fails 318 if (rslt != 0) 319 fatal(err_msg("pthread_attr_init failed with err = " INT32_FORMAT, rslt)); 320 321 rslt = pthread_attr_get_np(pthread_self(), &attr); 322 323 if (rslt != 0) 324 fatal(err_msg("pthread_attr_get_np failed with err = " INT32_FORMAT, 325 rslt)); 326 327 if (pthread_attr_getstackaddr(&attr, (void **) &stack_bottom) != 0 || 328 pthread_attr_getstacksize(&attr, &stack_bytes) != 0) { 329 fatal("Can not locate current stack attributes!"); 330 } 331 332 pthread_attr_destroy(&attr); 333 334 stack_top = stack_bottom + stack_bytes; 335 #endif 336 337 assert(os::current_stack_pointer() >= stack_bottom, "should do"); 338 assert(os::current_stack_pointer() < stack_top, "should do"); 339 340 *bottom = stack_bottom; 341 *size = stack_top - stack_bottom; 342 } 343 344 address os::current_stack_base() { 345 address bottom; 346 size_t size; 347 current_stack_region(&bottom, &size); 348 return bottom + size; 349 } 350 351 size_t os::current_stack_size() { 352 // stack size includes normal stack and HotSpot guard pages 353 address bottom; 354 size_t size; 355 current_stack_region(&bottom, &size); 356 return size; 357 } 358 359 ///////////////////////////////////////////////////////////////////////////// 360 // helper functions for fatal error handler 361 362 void os::print_context(outputStream* st, void* context) { 363 ShouldNotCallThis(); 364 } 365 366 void os::print_register_info(outputStream *st, void *context) { 367 ShouldNotCallThis(); 368 } 369 370 ///////////////////////////////////////////////////////////////////////////// 371 // Stubs for things that would be in bsd_zero.s if it existed. 372 // You probably want to disassemble these monkeys to check they're ok. 373 374 extern "C" { 375 int SpinPause() { 376 } 377 378 int SafeFetch32(int *adr, int errValue) { 379 int value = errValue; 380 value = *adr; 381 return value; 382 } 383 intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) { 384 intptr_t value = errValue; 385 value = *adr; 386 return value; 387 } 388 389 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { 390 if (from > to) { 391 jshort *end = from + count; 392 while (from < end) 393 *(to++) = *(from++); 394 } 395 else if (from < to) { 396 jshort *end = from; 397 from += count - 1; 398 to += count - 1; 399 while (from >= end) 400 *(to--) = *(from--); 401 } 402 } 403 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { 404 if (from > to) { 405 jint *end = from + count; 406 while (from < end) 407 *(to++) = *(from++); 408 } 409 else if (from < to) { 410 jint *end = from; 411 from += count - 1; 412 to += count - 1; 413 while (from >= end) 414 *(to--) = *(from--); 415 } 416 } 417 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { 418 if (from > to) { 419 jlong *end = from + count; 420 while (from < end) 421 os::atomic_copy64(from++, to++); 422 } 423 else if (from < to) { 424 jlong *end = from; 425 from += count - 1; 426 to += count - 1; 427 while (from >= end) 428 os::atomic_copy64(from--, to--); 429 } 430 } 431 432 void _Copy_arrayof_conjoint_bytes(HeapWord* from, 433 HeapWord* to, 434 size_t count) { 435 memmove(to, from, count); 436 } 437 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, 438 HeapWord* to, 439 size_t count) { 440 memmove(to, from, count * 2); 441 } 442 void _Copy_arrayof_conjoint_jints(HeapWord* from, 443 HeapWord* to, 444 size_t count) { 445 memmove(to, from, count * 4); 446 } 447 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, 448 HeapWord* to, 449 size_t count) { 450 memmove(to, from, count * 8); 451 } 452 }; 453 454 ///////////////////////////////////////////////////////////////////////////// 455 // Implementations of atomic operations not supported by processors. 456 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html 457 458 #ifndef _LP64 459 extern "C" { 460 long long unsigned int __sync_val_compare_and_swap_8( 461 volatile void *ptr, 462 long long unsigned int oldval, 463 long long unsigned int newval) { 464 ShouldNotCallThis(); 465 } 466 }; 467 #endif // !_LP64 468 469 #ifndef PRODUCT 470 void os::verify_stack_alignment() { 471 } 472 #endif