1 /* 2 * Copyright (c) 2003, 2016, 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 "nativeInst_zero.hpp" 42 #include "os_share_bsd.hpp" 43 #include "prims/jniFastGetField.hpp" 44 #include "prims/jvm.h" 45 #include "prims/jvm_misc.hpp" 46 #include "runtime/arguments.hpp" 47 #include "runtime/extendedPC.hpp" 48 #include "runtime/frame.inline.hpp" 49 #include "runtime/interfaceSupport.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/mutexLocker.hpp" 53 #include "runtime/osThread.hpp" 54 #include "runtime/sharedRuntime.hpp" 55 #include "runtime/stubRoutines.hpp" 56 #include "runtime/thread.inline.hpp" 57 #include "runtime/timer.hpp" 58 #include "utilities/events.hpp" 59 #include "utilities/vmError.hpp" 60 61 // See stubGenerator_zero.cpp 62 #include <setjmp.h> 63 extern sigjmp_buf* get_jmp_buf_for_continuation(); 64 65 address os::current_stack_pointer() { 66 address dummy = (address) &dummy; 67 return dummy; 68 } 69 70 frame os::get_sender_for_C_frame(frame* fr) { 71 ShouldNotCallThis(); 72 return frame(); 73 } 74 75 frame os::current_frame() { 76 // The only thing that calls this is the stack printing code in 77 // VMError::report: 78 // - Step 110 (printing stack bounds) uses the sp in the frame 79 // to determine the amount of free space on the stack. We 80 // set the sp to a close approximation of the real value in 81 // order to allow this step to complete. 82 // - Step 120 (printing native stack) tries to walk the stack. 83 // The frame we create has a NULL pc, which is ignored as an 84 // invalid frame. 85 frame dummy = frame(); 86 dummy.set_sp((intptr_t *) current_stack_pointer()); 87 return dummy; 88 } 89 90 char* os::non_memory_address_word() { 91 // Must never look like an address returned by reserve_memory, 92 // even in its subfields (as defined by the CPU immediate fields, 93 // if the CPU splits constants across multiple instructions). 94 #ifdef SPARC 95 // On SPARC, 0 != %hi(any real address), because there is no 96 // allocation in the first 1Kb of the virtual address space. 97 return (char *) 0; 98 #else 99 // This is the value for x86; works pretty well for PPC too. 100 return (char *) -1; 101 #endif // SPARC 102 } 103 104 void os::initialize_thread(Thread* thr) { 105 // Nothing to do. 106 } 107 108 address os::Bsd::ucontext_get_pc(const ucontext_t* uc) { 109 ShouldNotCallThis(); 110 return NULL; 111 } 112 113 void os::Bsd::ucontext_set_pc(ucontext_t * uc, address pc) { 114 ShouldNotCallThis(); 115 } 116 117 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 118 intptr_t** ret_sp, 119 intptr_t** ret_fp) { 120 ShouldNotCallThis(); 121 return ExtendedPC(); 122 } 123 124 frame os::fetch_frame_from_context(const void* ucVoid) { 125 ShouldNotCallThis(); 126 return frame(); 127 } 128 129 extern "C" JNIEXPORT int 130 JVM_handle_bsd_signal(int sig, 131 siginfo_t* info, 132 void* ucVoid, 133 int abort_if_unrecognized) { 134 ucontext_t* uc = (ucontext_t*) ucVoid; 135 136 Thread* t = Thread::current_or_null_safe(); 137 138 SignalHandlerMark shm(t); 139 140 // handle SafeFetch faults 141 if (sig == SIGSEGV || sig == SIGBUS) { 142 sigjmp_buf* const pjb = get_jmp_buf_for_continuation(); 143 if (pjb) { 144 siglongjmp(*pjb, 1); 145 } 146 } 147 148 // Note: it's not uncommon that JNI code uses signal/sigset to 149 // install then restore certain signal handler (e.g. to temporarily 150 // block SIGPIPE, or have a SIGILL handler when detecting CPU 151 // type). When that happens, JVM_handle_bsd_signal() might be 152 // invoked with junk info/ucVoid. To avoid unnecessary crash when 153 // libjsig is not preloaded, try handle signals that do not require 154 // siginfo/ucontext first. 155 156 if (sig == SIGPIPE || sig == SIGXFSZ) { 157 // allow chained handler to go first 158 if (os::Bsd::chained_handler(sig, info, ucVoid)) { 159 return true; 160 } else { 161 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 162 return true; 163 } 164 } 165 166 JavaThread* thread = NULL; 167 VMThread* vmthread = NULL; 168 if (os::Bsd::signal_handlers_are_installed) { 169 if (t != NULL ){ 170 if(t->is_Java_thread()) { 171 thread = (JavaThread*)t; 172 } 173 else if(t->is_VM_thread()){ 174 vmthread = (VMThread *)t; 175 } 176 } 177 } 178 179 if (info != NULL && thread != NULL) { 180 // Handle ALL stack overflow variations here 181 if (sig == SIGSEGV || sig == SIGBUS) { 182 address addr = (address) info->si_addr; 183 184 // check if fault address is within thread stack 185 if (thread->on_local_stack(addr)) { 186 // stack overflow 187 if (thread->in_stack_yellow_reserved_zone(addr)) { 188 thread->disable_stack_yellow_reserved_zone(); 189 ShouldNotCallThis(); 190 } 191 else if (thread->in_stack_red_zone(addr)) { 192 thread->disable_stack_red_zone(); 193 ShouldNotCallThis(); 194 } 195 } 196 } 197 198 /*if (thread->thread_state() == _thread_in_Java) { 199 ShouldNotCallThis(); 200 } 201 else*/ if (thread->thread_state() == _thread_in_vm && 202 sig == SIGBUS && thread->doing_unsafe_access()) { 203 ShouldNotCallThis(); 204 } 205 206 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC 207 // kicks in and the heap gets shrunk before the field access. 208 /*if (sig == SIGSEGV || sig == SIGBUS) { 209 address addr = JNI_FastGetField::find_slowcase_pc(pc); 210 if (addr != (address)-1) { 211 stub = addr; 212 } 213 }*/ 214 215 // Check to see if we caught the safepoint code in the process 216 // of write protecting the memory serialization page. It write 217 // enables the page immediately after protecting it so we can 218 // just return to retry the write. 219 if ((sig == SIGSEGV || sig == SIGBUS) && 220 os::is_memory_serialize_page(thread, (address) info->si_addr)) { 221 // Block current thread until permission is restored. 222 os::block_on_serialize_page_trap(); 223 return true; 224 } 225 } 226 227 // signal-chaining 228 if (os::Bsd::chained_handler(sig, info, ucVoid)) { 229 return true; 230 } 231 232 if (!abort_if_unrecognized) { 233 // caller wants another chance, so give it to him 234 return false; 235 } 236 237 #ifndef PRODUCT 238 if (sig == SIGSEGV) { 239 fatal("\n#" 240 "\n# /--------------------\\" 241 "\n# | segmentation fault |" 242 "\n# \\---\\ /--------------/" 243 "\n# /" 244 "\n# [-] |\\_/| " 245 "\n# (+)=C |o o|__ " 246 "\n# | | =-*-=__\\ " 247 "\n# OOO c_c_(___)"); 248 } 249 #endif // !PRODUCT 250 251 const char *fmt = 252 "caught unhandled signal " INT32_FORMAT " at address " PTR_FORMAT; 253 char buf[128]; 254 255 sprintf(buf, fmt, sig, info->si_addr); 256 fatal(buf); 257 return false; 258 } 259 260 void os::Bsd::init_thread_fpu_state(void) { 261 // Nothing to do 262 } 263 264 bool os::is_allocatable(size_t bytes) { 265 #ifdef _LP64 266 return true; 267 #else 268 if (bytes < 2 * G) { 269 return true; 270 } 271 272 char* addr = reserve_memory(bytes, NULL); 273 274 if (addr != NULL) { 275 release_memory(addr, bytes); 276 } 277 278 return addr != NULL; 279 #endif // _LP64 280 } 281 282 /////////////////////////////////////////////////////////////////////////////// 283 // thread stack 284 285 size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K; 286 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; 287 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K; 288 289 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 290 #ifdef _LP64 291 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 292 #else 293 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); 294 #endif // _LP64 295 return s; 296 } 297 298 static void current_stack_region(address *bottom, size_t *size) { 299 address stack_bottom; 300 address stack_top; 301 size_t stack_bytes; 302 303 #ifdef __APPLE__ 304 pthread_t self = pthread_self(); 305 stack_top = (address) pthread_get_stackaddr_np(self); 306 stack_bytes = pthread_get_stacksize_np(self); 307 stack_bottom = stack_top - stack_bytes; 308 #elif defined(__OpenBSD__) 309 stack_t ss; 310 int rslt = pthread_stackseg_np(pthread_self(), &ss); 311 312 if (rslt != 0) 313 fatal("pthread_stackseg_np failed with err = " INT32_FORMAT, rslt); 314 315 stack_top = (address) ss.ss_sp; 316 stack_bytes = ss.ss_size; 317 stack_bottom = stack_top - stack_bytes; 318 #else 319 pthread_attr_t attr; 320 321 int rslt = pthread_attr_init(&attr); 322 323 // JVM needs to know exact stack location, abort if it fails 324 if (rslt != 0) 325 fatal("pthread_attr_init failed with err = " INT32_FORMAT, rslt); 326 327 rslt = pthread_attr_get_np(pthread_self(), &attr); 328 329 if (rslt != 0) 330 fatal("pthread_attr_get_np failed with err = " INT32_FORMAT, rslt); 331 332 if (pthread_attr_getstackaddr(&attr, (void **) &stack_bottom) != 0 || 333 pthread_attr_getstacksize(&attr, &stack_bytes) != 0) { 334 fatal("Can not locate current stack attributes!"); 335 } 336 337 pthread_attr_destroy(&attr); 338 339 stack_top = stack_bottom + stack_bytes; 340 #endif 341 342 assert(os::current_stack_pointer() >= stack_bottom, "should do"); 343 assert(os::current_stack_pointer() < stack_top, "should do"); 344 345 *bottom = stack_bottom; 346 *size = stack_top - stack_bottom; 347 } 348 349 address os::current_stack_base() { 350 address bottom; 351 size_t size; 352 current_stack_region(&bottom, &size); 353 return bottom + size; 354 } 355 356 size_t os::current_stack_size() { 357 // stack size includes normal stack and HotSpot guard pages 358 address bottom; 359 size_t size; 360 current_stack_region(&bottom, &size); 361 return size; 362 } 363 364 ///////////////////////////////////////////////////////////////////////////// 365 // helper functions for fatal error handler 366 367 void os::print_context(outputStream* st, const void* context) { 368 ShouldNotCallThis(); 369 } 370 371 void os::print_register_info(outputStream *st, const void *context) { 372 ShouldNotCallThis(); 373 } 374 375 ///////////////////////////////////////////////////////////////////////////// 376 // Stubs for things that would be in bsd_zero.s if it existed. 377 // You probably want to disassemble these monkeys to check they're ok. 378 379 extern "C" { 380 int SpinPause() { 381 return 1; 382 } 383 384 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { 385 if (from > to) { 386 jshort *end = from + count; 387 while (from < end) 388 *(to++) = *(from++); 389 } 390 else if (from < to) { 391 jshort *end = from; 392 from += count - 1; 393 to += count - 1; 394 while (from >= end) 395 *(to--) = *(from--); 396 } 397 } 398 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { 399 if (from > to) { 400 jint *end = from + count; 401 while (from < end) 402 *(to++) = *(from++); 403 } 404 else if (from < to) { 405 jint *end = from; 406 from += count - 1; 407 to += count - 1; 408 while (from >= end) 409 *(to--) = *(from--); 410 } 411 } 412 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { 413 if (from > to) { 414 jlong *end = from + count; 415 while (from < end) 416 os::atomic_copy64(from++, to++); 417 } 418 else if (from < to) { 419 jlong *end = from; 420 from += count - 1; 421 to += count - 1; 422 while (from >= end) 423 os::atomic_copy64(from--, to--); 424 } 425 } 426 427 void _Copy_arrayof_conjoint_bytes(HeapWord* from, 428 HeapWord* to, 429 size_t count) { 430 memmove(to, from, count); 431 } 432 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, 433 HeapWord* to, 434 size_t count) { 435 memmove(to, from, count * 2); 436 } 437 void _Copy_arrayof_conjoint_jints(HeapWord* from, 438 HeapWord* to, 439 size_t count) { 440 memmove(to, from, count * 4); 441 } 442 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, 443 HeapWord* to, 444 size_t count) { 445 memmove(to, from, count * 8); 446 } 447 }; 448 449 ///////////////////////////////////////////////////////////////////////////// 450 // Implementations of atomic operations not supported by processors. 451 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html 452 453 #ifndef _LP64 454 extern "C" { 455 long long unsigned int __sync_val_compare_and_swap_8( 456 volatile void *ptr, 457 long long unsigned int oldval, 458 long long unsigned int newval) { 459 ShouldNotCallThis(); 460 } 461 }; 462 #endif // !_LP64 463 464 #ifndef PRODUCT 465 void os::verify_stack_alignment() { 466 } 467 #endif 468 469 int os::extra_bang_size_in_bytes() { 470 // Zero does not require an additional stack bang. 471 return 0; 472 }