Mercurial > hg > truffle
annotate src/os_cpu/linux_zero/vm/os_linux_zero.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 1010 | 1 /* |
| 17524 | 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
|
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3 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc. |
| 1010 | 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 * | |
|
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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. |
| 1010 | 23 * |
| 24 */ | |
| 25 | |
| 1972 | 26 // no precompiled headers |
| 27 #include "assembler_zero.inline.hpp" | |
| 28 #include "classfile/classLoader.hpp" | |
| 29 #include "classfile/systemDictionary.hpp" | |
| 30 #include "classfile/vmSymbols.hpp" | |
| 31 #include "code/icBuffer.hpp" | |
| 32 #include "code/vtableStubs.hpp" | |
| 33 #include "interpreter/interpreter.hpp" | |
| 34 #include "jvm_linux.h" | |
| 35 #include "memory/allocation.inline.hpp" | |
| 36 #include "mutex_linux.inline.hpp" | |
| 37 #include "nativeInst_zero.hpp" | |
| 38 #include "os_share_linux.hpp" | |
| 39 #include "prims/jniFastGetField.hpp" | |
| 40 #include "prims/jvm.h" | |
| 41 #include "prims/jvm_misc.hpp" | |
| 42 #include "runtime/arguments.hpp" | |
| 43 #include "runtime/extendedPC.hpp" | |
| 44 #include "runtime/frame.inline.hpp" | |
| 45 #include "runtime/interfaceSupport.hpp" | |
| 46 #include "runtime/java.hpp" | |
| 47 #include "runtime/javaCalls.hpp" | |
| 48 #include "runtime/mutexLocker.hpp" | |
| 49 #include "runtime/osThread.hpp" | |
| 50 #include "runtime/sharedRuntime.hpp" | |
| 51 #include "runtime/stubRoutines.hpp" | |
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52 #include "runtime/thread.inline.hpp" |
| 1972 | 53 #include "runtime/timer.hpp" |
| 54 #include "utilities/events.hpp" | |
| 55 #include "utilities/vmError.hpp" | |
| 1010 | 56 |
| 57 address os::current_stack_pointer() { | |
| 58 address dummy = (address) &dummy; | |
| 59 return dummy; | |
| 60 } | |
| 61 | |
| 62 frame os::get_sender_for_C_frame(frame* fr) { | |
| 63 ShouldNotCallThis(); | |
| 64 } | |
| 65 | |
| 66 frame os::current_frame() { | |
| 67 // The only thing that calls this is the stack printing code in | |
| 68 // VMError::report: | |
| 69 // - Step 110 (printing stack bounds) uses the sp in the frame | |
| 70 // to determine the amount of free space on the stack. We | |
| 71 // set the sp to a close approximation of the real value in | |
| 72 // order to allow this step to complete. | |
| 73 // - Step 120 (printing native stack) tries to walk the stack. | |
| 74 // The frame we create has a NULL pc, which is ignored as an | |
| 75 // invalid frame. | |
| 76 frame dummy = frame(); | |
| 77 dummy.set_sp((intptr_t *) current_stack_pointer()); | |
| 78 return dummy; | |
| 79 } | |
| 80 | |
| 81 char* os::non_memory_address_word() { | |
| 82 // Must never look like an address returned by reserve_memory, | |
| 83 // even in its subfields (as defined by the CPU immediate fields, | |
| 84 // if the CPU splits constants across multiple instructions). | |
| 85 #ifdef SPARC | |
| 86 // On SPARC, 0 != %hi(any real address), because there is no | |
| 87 // allocation in the first 1Kb of the virtual address space. | |
| 88 return (char *) 0; | |
| 89 #else | |
| 90 // This is the value for x86; works pretty well for PPC too. | |
| 91 return (char *) -1; | |
| 92 #endif // SPARC | |
| 93 } | |
| 94 | |
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95 void os::initialize_thread(Thread * thr){ |
| 1010 | 96 // Nothing to do. |
| 97 } | |
| 98 | |
| 99 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
| 100 ShouldNotCallThis(); | |
| 101 } | |
| 102 | |
| 103 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
| 104 intptr_t** ret_sp, | |
| 105 intptr_t** ret_fp) { | |
| 106 ShouldNotCallThis(); | |
| 107 } | |
| 108 | |
| 109 frame os::fetch_frame_from_context(void* ucVoid) { | |
| 110 ShouldNotCallThis(); | |
| 111 } | |
| 112 | |
| 2191 | 113 extern "C" JNIEXPORT int |
| 1010 | 114 JVM_handle_linux_signal(int sig, |
| 115 siginfo_t* info, | |
| 116 void* ucVoid, | |
| 117 int abort_if_unrecognized) { | |
| 118 ucontext_t* uc = (ucontext_t*) ucVoid; | |
| 119 | |
| 120 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 121 | |
| 122 SignalHandlerMark shm(t); | |
| 123 | |
| 124 // Note: it's not uncommon that JNI code uses signal/sigset to | |
| 125 // install then restore certain signal handler (e.g. to temporarily | |
| 126 // block SIGPIPE, or have a SIGILL handler when detecting CPU | |
| 127 // type). When that happens, JVM_handle_linux_signal() might be | |
| 128 // invoked with junk info/ucVoid. To avoid unnecessary crash when | |
| 129 // libjsig is not preloaded, try handle signals that do not require | |
| 130 // siginfo/ucontext first. | |
| 131 | |
| 132 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
| 133 // allow chained handler to go first | |
| 134 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
| 135 return true; | |
| 136 } else { | |
| 137 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
| 138 char buf[64]; | |
| 139 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
| 140 os::exception_name(sig, buf, sizeof(buf))); | |
| 141 } | |
| 142 return true; | |
| 143 } | |
| 144 } | |
| 145 | |
| 146 JavaThread* thread = NULL; | |
| 147 VMThread* vmthread = NULL; | |
| 148 if (os::Linux::signal_handlers_are_installed) { | |
| 149 if (t != NULL ){ | |
| 150 if(t->is_Java_thread()) { | |
| 151 thread = (JavaThread*)t; | |
| 152 } | |
| 153 else if(t->is_VM_thread()){ | |
| 154 vmthread = (VMThread *)t; | |
| 155 } | |
| 156 } | |
| 157 } | |
| 158 | |
| 159 if (info != NULL && thread != NULL) { | |
| 160 // Handle ALL stack overflow variations here | |
| 161 if (sig == SIGSEGV) { | |
| 162 address addr = (address) info->si_addr; | |
| 163 | |
| 164 // check if fault address is within thread stack | |
| 165 if (addr < thread->stack_base() && | |
| 166 addr >= thread->stack_base() - thread->stack_size()) { | |
| 167 // stack overflow | |
| 168 if (thread->in_stack_yellow_zone(addr)) { | |
| 169 thread->disable_stack_yellow_zone(); | |
| 170 ShouldNotCallThis(); | |
| 171 } | |
| 172 else if (thread->in_stack_red_zone(addr)) { | |
| 173 thread->disable_stack_red_zone(); | |
| 174 ShouldNotCallThis(); | |
| 175 } | |
| 176 else { | |
| 177 // Accessing stack address below sp may cause SEGV if | |
| 178 // current thread has MAP_GROWSDOWN stack. This should | |
| 179 // only happen when current thread was created by user | |
| 180 // code with MAP_GROWSDOWN flag and then attached to VM. | |
| 181 // See notes in os_linux.cpp. | |
| 182 if (thread->osthread()->expanding_stack() == 0) { | |
| 183 thread->osthread()->set_expanding_stack(); | |
| 184 if (os::Linux::manually_expand_stack(thread, addr)) { | |
| 185 thread->osthread()->clear_expanding_stack(); | |
| 186 return true; | |
| 187 } | |
| 188 thread->osthread()->clear_expanding_stack(); | |
| 189 } | |
| 190 else { | |
| 191 fatal("recursive segv. expanding stack."); | |
| 192 } | |
| 193 } | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 /*if (thread->thread_state() == _thread_in_Java) { | |
| 198 ShouldNotCallThis(); | |
| 199 } | |
| 200 else*/ if (thread->thread_state() == _thread_in_vm && | |
| 201 sig == SIGBUS && thread->doing_unsafe_access()) { | |
| 202 ShouldNotCallThis(); | |
| 203 } | |
| 204 | |
| 205 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC | |
| 206 // kicks in and the heap gets shrunk before the field access. | |
| 207 /*if (sig == SIGSEGV || sig == SIGBUS) { | |
| 208 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
| 209 if (addr != (address)-1) { | |
| 210 stub = addr; | |
| 211 } | |
| 212 }*/ | |
| 213 | |
| 214 // Check to see if we caught the safepoint code in the process | |
| 215 // of write protecting the memory serialization page. It write | |
| 216 // enables the page immediately after protecting it so we can | |
| 217 // just return to retry the write. | |
| 218 if (sig == SIGSEGV && | |
| 219 os::is_memory_serialize_page(thread, (address) info->si_addr)) { | |
| 220 // Block current thread until permission is restored. | |
| 221 os::block_on_serialize_page_trap(); | |
| 222 return true; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 // signal-chaining | |
| 227 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
| 228 return true; | |
| 229 } | |
| 230 | |
| 231 if (!abort_if_unrecognized) { | |
| 232 // caller wants another chance, so give it to him | |
| 233 return false; | |
| 234 } | |
| 235 | |
| 236 #ifndef PRODUCT | |
| 237 if (sig == SIGSEGV) { | |
| 238 fatal("\n#" | |
| 239 "\n# /--------------------\\" | |
| 240 "\n# | segmentation fault |" | |
| 241 "\n# \\---\\ /--------------/" | |
| 242 "\n# /" | |
| 243 "\n# [-] |\\_/| " | |
| 244 "\n# (+)=C |o o|__ " | |
| 245 "\n# | | =-*-=__\\ " | |
| 246 "\n# OOO c_c_(___)"); | |
| 247 } | |
| 248 #endif // !PRODUCT | |
| 249 | |
| 250 const char *fmt = "caught unhandled signal %d"; | |
| 251 char buf[64]; | |
| 252 | |
| 253 sprintf(buf, fmt, sig); | |
| 254 fatal(buf); | |
| 255 } | |
| 256 | |
| 257 void os::Linux::init_thread_fpu_state(void) { | |
| 258 // Nothing to do | |
| 259 } | |
| 260 | |
| 261 int os::Linux::get_fpu_control_word() { | |
| 262 ShouldNotCallThis(); | |
| 263 } | |
| 264 | |
| 265 void os::Linux::set_fpu_control_word(int fpu) { | |
| 266 ShouldNotCallThis(); | |
| 267 } | |
| 268 | |
| 269 bool os::is_allocatable(size_t bytes) { | |
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270 #ifdef _LP64 |
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271 return true; |
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272 #else |
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273 if (bytes < 2 * G) { |
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274 return true; |
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275 } |
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276 |
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277 char* addr = reserve_memory(bytes, NULL); |
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278 |
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279 if (addr != NULL) { |
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280 release_memory(addr, bytes); |
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281 } |
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282 |
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283 return addr != NULL; |
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284 #endif // _LP64 |
| 1010 | 285 } |
| 286 | |
| 287 /////////////////////////////////////////////////////////////////////////////// | |
| 288 // thread stack | |
| 289 | |
| 290 size_t os::Linux::min_stack_allowed = 64 * K; | |
| 291 | |
| 292 bool os::Linux::supports_variable_stack_size() { | |
| 293 return true; | |
| 294 } | |
| 295 | |
| 296 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
| 297 #ifdef _LP64 | |
| 298 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
| 299 #else | |
| 300 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); | |
| 301 #endif // _LP64 | |
| 302 return s; | |
| 303 } | |
| 304 | |
| 305 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
| 306 // Only enable glibc guard pages for non-Java threads | |
| 307 // (Java threads have HotSpot guard pages) | |
| 308 return (thr_type == java_thread ? 0 : page_size()); | |
| 309 } | |
| 310 | |
| 311 static void current_stack_region(address *bottom, size_t *size) { | |
| 312 pthread_attr_t attr; | |
| 313 int res = pthread_getattr_np(pthread_self(), &attr); | |
| 314 if (res != 0) { | |
| 315 if (res == ENOMEM) { | |
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316 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); |
| 1010 | 317 } |
| 318 else { | |
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319 fatal(err_msg("pthread_getattr_np failed with errno = %d", res)); |
| 1010 | 320 } |
| 321 } | |
| 322 | |
| 323 address stack_bottom; | |
| 324 size_t stack_bytes; | |
| 325 res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes); | |
| 326 if (res != 0) { | |
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327 fatal(err_msg("pthread_attr_getstack failed with errno = %d", res)); |
| 1010 | 328 } |
| 329 address stack_top = stack_bottom + stack_bytes; | |
| 330 | |
| 331 // The block of memory returned by pthread_attr_getstack() includes | |
| 332 // guard pages where present. We need to trim these off. | |
| 333 size_t page_bytes = os::Linux::page_size(); | |
| 334 assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack"); | |
| 335 | |
| 336 size_t guard_bytes; | |
| 337 res = pthread_attr_getguardsize(&attr, &guard_bytes); | |
| 338 if (res != 0) { | |
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339 fatal(err_msg("pthread_attr_getguardsize failed with errno = %d", res)); |
| 1010 | 340 } |
| 341 int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes; | |
| 342 assert(guard_bytes == guard_pages * page_bytes, "unaligned guard"); | |
| 343 | |
| 344 #ifdef IA64 | |
| 345 // IA64 has two stacks sharing the same area of memory, a normal | |
| 346 // stack growing downwards and a register stack growing upwards. | |
| 347 // Guard pages, if present, are in the centre. This code splits | |
| 348 // the stack in two even without guard pages, though in theory | |
| 349 // there's nothing to stop us allocating more to the normal stack | |
| 350 // or more to the register stack if one or the other were found | |
| 351 // to grow faster. | |
| 352 int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes; | |
| 353 stack_bottom += (total_pages - guard_pages) / 2 * page_bytes; | |
| 354 #endif // IA64 | |
| 355 | |
| 356 stack_bottom += guard_bytes; | |
| 357 | |
| 358 pthread_attr_destroy(&attr); | |
| 359 | |
| 360 // The initial thread has a growable stack, and the size reported | |
| 361 // by pthread_attr_getstack is the maximum size it could possibly | |
| 362 // be given what currently mapped. This can be huge, so we cap it. | |
| 363 if (os::Linux::is_initial_thread()) { | |
| 364 stack_bytes = stack_top - stack_bottom; | |
| 365 | |
| 366 if (stack_bytes > JavaThread::stack_size_at_create()) | |
| 367 stack_bytes = JavaThread::stack_size_at_create(); | |
| 368 | |
| 369 stack_bottom = stack_top - stack_bytes; | |
| 370 } | |
| 371 | |
| 372 assert(os::current_stack_pointer() >= stack_bottom, "should do"); | |
| 373 assert(os::current_stack_pointer() < stack_top, "should do"); | |
| 374 | |
| 375 *bottom = stack_bottom; | |
| 376 *size = stack_top - stack_bottom; | |
| 377 } | |
| 378 | |
| 379 address os::current_stack_base() { | |
| 380 address bottom; | |
| 381 size_t size; | |
| 382 current_stack_region(&bottom, &size); | |
| 383 return bottom + size; | |
| 384 } | |
| 385 | |
| 386 size_t os::current_stack_size() { | |
| 387 // stack size includes normal stack and HotSpot guard pages | |
| 388 address bottom; | |
| 389 size_t size; | |
| 390 current_stack_region(&bottom, &size); | |
| 391 return size; | |
| 392 } | |
| 393 | |
| 394 ///////////////////////////////////////////////////////////////////////////// | |
| 395 // helper functions for fatal error handler | |
| 396 | |
| 397 void os::print_context(outputStream* st, void* context) { | |
| 398 ShouldNotCallThis(); | |
| 399 } | |
| 400 | |
| 1970 | 401 void os::print_register_info(outputStream *st, void *context) { |
| 402 ShouldNotCallThis(); | |
| 403 } | |
| 404 | |
| 1010 | 405 ///////////////////////////////////////////////////////////////////////////// |
| 406 // Stubs for things that would be in linux_zero.s if it existed. | |
| 407 // You probably want to disassemble these monkeys to check they're ok. | |
| 408 | |
| 409 extern "C" { | |
| 410 int SpinPause() { | |
| 411 } | |
| 412 | |
| 413 | |
| 414 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { | |
| 415 if (from > to) { | |
| 416 jshort *end = from + count; | |
| 417 while (from < end) | |
| 418 *(to++) = *(from++); | |
| 419 } | |
| 420 else if (from < to) { | |
| 421 jshort *end = from; | |
| 422 from += count - 1; | |
| 423 to += count - 1; | |
| 424 while (from >= end) | |
| 425 *(to--) = *(from--); | |
| 426 } | |
| 427 } | |
| 428 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { | |
| 429 if (from > to) { | |
| 430 jint *end = from + count; | |
| 431 while (from < end) | |
| 432 *(to++) = *(from++); | |
| 433 } | |
| 434 else if (from < to) { | |
| 435 jint *end = from; | |
| 436 from += count - 1; | |
| 437 to += count - 1; | |
| 438 while (from >= end) | |
| 439 *(to--) = *(from--); | |
| 440 } | |
| 441 } | |
| 442 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { | |
| 443 if (from > to) { | |
| 444 jlong *end = from + count; | |
| 445 while (from < end) | |
| 446 os::atomic_copy64(from++, to++); | |
| 447 } | |
| 448 else if (from < to) { | |
| 449 jlong *end = from; | |
| 450 from += count - 1; | |
| 451 to += count - 1; | |
| 452 while (from >= end) | |
| 453 os::atomic_copy64(from--, to--); | |
| 454 } | |
| 455 } | |
| 456 | |
| 457 void _Copy_arrayof_conjoint_bytes(HeapWord* from, | |
| 458 HeapWord* to, | |
| 459 size_t count) { | |
| 1729 | 460 memmove(to, from, count); |
| 1010 | 461 } |
| 462 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, | |
| 463 HeapWord* to, | |
| 464 size_t count) { | |
| 1729 | 465 memmove(to, from, count * 2); |
| 1010 | 466 } |
| 467 void _Copy_arrayof_conjoint_jints(HeapWord* from, | |
| 468 HeapWord* to, | |
| 469 size_t count) { | |
| 1729 | 470 memmove(to, from, count * 4); |
| 1010 | 471 } |
| 472 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, | |
| 473 HeapWord* to, | |
| 474 size_t count) { | |
| 1729 | 475 memmove(to, from, count * 8); |
| 1010 | 476 } |
| 477 }; | |
| 478 | |
| 479 ///////////////////////////////////////////////////////////////////////////// | |
| 480 // Implementations of atomic operations not supported by processors. | |
| 481 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html | |
| 482 | |
| 483 #ifndef _LP64 | |
| 484 extern "C" { | |
| 485 long long unsigned int __sync_val_compare_and_swap_8( | |
| 486 volatile void *ptr, | |
| 487 long long unsigned int oldval, | |
| 488 long long unsigned int newval) { | |
| 489 ShouldNotCallThis(); | |
| 490 } | |
| 491 }; | |
| 492 #endif // !_LP64 | |
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493 |
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494 #ifndef PRODUCT |
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495 void os::verify_stack_alignment() { |
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496 } |
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497 #endif |