Mercurial > hg > truffle
annotate src/os_cpu/bsd_zero/vm/os_bsd_zero.cpp @ 6897:588f08ed16cf
Merge
author | kvn |
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date | Fri, 26 Oct 2012 12:06:55 -0700 |
parents | b9a9ed0f8eeb |
children | 0af5da0c9d9d |
rev | line source |
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3960 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
3960 | 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(_ALLBSD_SOURCE) && !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/timer.hpp" | |
58 #include "thread_bsd.inline.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 | |
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100 void os::initialize_thread(Thread* thr) { |
3960 | 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 | |
4006 | 166 if (sig == SIGSEGV || sig == SIGBUS) { |
3960 | 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 #ifndef _ALLBSD_SOURCE | |
182 else { | |
183 // Accessing stack address below sp may cause SEGV if | |
184 // current thread has MAP_GROWSDOWN stack. This should | |
185 // only happen when current thread was created by user | |
186 // code with MAP_GROWSDOWN flag and then attached to VM. | |
187 // See notes in os_bsd.cpp. | |
188 if (thread->osthread()->expanding_stack() == 0) { | |
189 thread->osthread()->set_expanding_stack(); | |
190 if (os::Bsd::manually_expand_stack(thread, addr)) { | |
191 thread->osthread()->clear_expanding_stack(); | |
192 return true; | |
193 } | |
194 thread->osthread()->clear_expanding_stack(); | |
195 } | |
196 else { | |
197 fatal("recursive segv. expanding stack."); | |
198 } | |
199 } | |
200 #endif | |
201 } | |
202 } | |
203 | |
204 /*if (thread->thread_state() == _thread_in_Java) { | |
205 ShouldNotCallThis(); | |
206 } | |
207 else*/ if (thread->thread_state() == _thread_in_vm && | |
208 sig == SIGBUS && thread->doing_unsafe_access()) { | |
209 ShouldNotCallThis(); | |
210 } | |
211 | |
212 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC | |
213 // kicks in and the heap gets shrunk before the field access. | |
214 /*if (sig == SIGSEGV || sig == SIGBUS) { | |
215 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
216 if (addr != (address)-1) { | |
217 stub = addr; | |
218 } | |
219 }*/ | |
220 | |
221 // Check to see if we caught the safepoint code in the process | |
222 // of write protecting the memory serialization page. It write | |
223 // enables the page immediately after protecting it so we can | |
224 // just return to retry the write. | |
4006 | 225 if ((sig == SIGSEGV || sig == SIGBUS) && |
3960 | 226 os::is_memory_serialize_page(thread, (address) info->si_addr)) { |
227 // Block current thread until permission is restored. | |
228 os::block_on_serialize_page_trap(); | |
229 return true; | |
230 } | |
231 } | |
232 | |
233 // signal-chaining | |
234 if (os::Bsd::chained_handler(sig, info, ucVoid)) { | |
235 return true; | |
236 } | |
237 | |
238 if (!abort_if_unrecognized) { | |
239 // caller wants another chance, so give it to him | |
240 return false; | |
241 } | |
242 | |
243 #ifndef PRODUCT | |
244 if (sig == SIGSEGV) { | |
245 fatal("\n#" | |
246 "\n# /--------------------\\" | |
247 "\n# | segmentation fault |" | |
248 "\n# \\---\\ /--------------/" | |
249 "\n# /" | |
250 "\n# [-] |\\_/| " | |
251 "\n# (+)=C |o o|__ " | |
252 "\n# | | =-*-=__\\ " | |
253 "\n# OOO c_c_(___)"); | |
254 } | |
255 #endif // !PRODUCT | |
256 | |
4006 | 257 const char *fmt = |
258 "caught unhandled signal " INT32_FORMAT " at address " PTR_FORMAT; | |
259 char buf[128]; | |
3960 | 260 |
4006 | 261 sprintf(buf, fmt, sig, info->si_addr); |
3960 | 262 fatal(buf); |
263 } | |
264 | |
265 void os::Bsd::init_thread_fpu_state(void) { | |
266 // Nothing to do | |
267 } | |
268 | |
269 #ifndef _ALLBSD_SOURCE | |
270 int os::Bsd::get_fpu_control_word() { | |
271 ShouldNotCallThis(); | |
272 } | |
273 | |
274 void os::Bsd::set_fpu_control_word(int fpu) { | |
275 ShouldNotCallThis(); | |
276 } | |
277 #endif | |
278 | |
279 bool os::is_allocatable(size_t bytes) { | |
280 #ifdef _LP64 | |
281 return true; | |
282 #else | |
283 if (bytes < 2 * G) { | |
284 return true; | |
285 } | |
286 | |
287 char* addr = reserve_memory(bytes, NULL); | |
288 | |
289 if (addr != NULL) { | |
290 release_memory(addr, bytes); | |
291 } | |
292 | |
293 return addr != NULL; | |
294 #endif // _LP64 | |
295 } | |
296 | |
297 /////////////////////////////////////////////////////////////////////////////// | |
298 // thread stack | |
299 | |
300 size_t os::Bsd::min_stack_allowed = 64 * K; | |
301 | |
302 bool os::Bsd::supports_variable_stack_size() { | |
303 return true; | |
304 } | |
305 | |
306 size_t os::Bsd::default_stack_size(os::ThreadType thr_type) { | |
307 #ifdef _LP64 | |
308 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
309 #else | |
310 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); | |
311 #endif // _LP64 | |
312 return s; | |
313 } | |
314 | |
315 size_t os::Bsd::default_guard_size(os::ThreadType thr_type) { | |
316 // Only enable glibc guard pages for non-Java threads | |
317 // (Java threads have HotSpot guard pages) | |
318 return (thr_type == java_thread ? 0 : page_size()); | |
319 } | |
320 | |
321 static void current_stack_region(address *bottom, size_t *size) { | |
322 address stack_bottom; | |
323 address stack_top; | |
324 size_t stack_bytes; | |
325 | |
326 #ifdef __APPLE__ | |
327 pthread_t self = pthread_self(); | |
328 stack_top = (address) pthread_get_stackaddr_np(self); | |
329 stack_bytes = pthread_get_stacksize_np(self); | |
330 stack_bottom = stack_top - stack_bytes; | |
331 #elif defined(__OpenBSD__) | |
332 stack_t ss; | |
333 int rslt = pthread_stackseg_np(pthread_self(), &ss); | |
334 | |
335 if (rslt != 0) | |
4006 | 336 fatal(err_msg("pthread_stackseg_np failed with err = " INT32_FORMAT, |
337 rslt)); | |
3960 | 338 |
339 stack_top = (address) ss.ss_sp; | |
340 stack_bytes = ss.ss_size; | |
341 stack_bottom = stack_top - stack_bytes; | |
342 #elif defined(_ALLBSD_SOURCE) | |
343 pthread_attr_t attr; | |
344 | |
345 int rslt = pthread_attr_init(&attr); | |
346 | |
347 // JVM needs to know exact stack location, abort if it fails | |
348 if (rslt != 0) | |
4006 | 349 fatal(err_msg("pthread_attr_init failed with err = " INT32_FORMAT, rslt)); |
3960 | 350 |
351 rslt = pthread_attr_get_np(pthread_self(), &attr); | |
352 | |
353 if (rslt != 0) | |
4006 | 354 fatal(err_msg("pthread_attr_get_np failed with err = " INT32_FORMAT, |
355 rslt)); | |
3960 | 356 |
357 if (pthread_attr_getstackaddr(&attr, (void **) &stack_bottom) != 0 || | |
358 pthread_attr_getstacksize(&attr, &stack_bytes) != 0) { | |
359 fatal("Can not locate current stack attributes!"); | |
360 } | |
361 | |
362 pthread_attr_destroy(&attr); | |
363 | |
364 stack_top = stack_bottom + stack_bytes; | |
365 #else /* Linux */ | |
366 pthread_attr_t attr; | |
367 int res = pthread_getattr_np(pthread_self(), &attr); | |
368 if (res != 0) { | |
369 if (res == ENOMEM) { | |
370 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
371 } | |
372 else { | |
4006 | 373 fatal(err_msg("pthread_getattr_np failed with errno = " INT32_FORMAT, |
374 res)); | |
3960 | 375 } |
376 } | |
377 | |
378 res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes); | |
379 if (res != 0) { | |
4006 | 380 fatal(err_msg("pthread_attr_getstack failed with errno = " INT32_FORMAT, |
381 res)); | |
3960 | 382 } |
383 stack_top = stack_bottom + stack_bytes; | |
384 | |
385 // The block of memory returned by pthread_attr_getstack() includes | |
386 // guard pages where present. We need to trim these off. | |
387 size_t page_bytes = os::Bsd::page_size(); | |
388 assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack"); | |
389 | |
390 size_t guard_bytes; | |
391 res = pthread_attr_getguardsize(&attr, &guard_bytes); | |
392 if (res != 0) { | |
4006 | 393 fatal(err_msg( |
394 "pthread_attr_getguardsize failed with errno = " INT32_FORMAT, res)); | |
3960 | 395 } |
396 int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes; | |
397 assert(guard_bytes == guard_pages * page_bytes, "unaligned guard"); | |
398 | |
399 #ifdef IA64 | |
400 // IA64 has two stacks sharing the same area of memory, a normal | |
401 // stack growing downwards and a register stack growing upwards. | |
402 // Guard pages, if present, are in the centre. This code splits | |
403 // the stack in two even without guard pages, though in theory | |
404 // there's nothing to stop us allocating more to the normal stack | |
405 // or more to the register stack if one or the other were found | |
406 // to grow faster. | |
407 int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes; | |
408 stack_bottom += (total_pages - guard_pages) / 2 * page_bytes; | |
409 #endif // IA64 | |
410 | |
411 stack_bottom += guard_bytes; | |
412 | |
413 pthread_attr_destroy(&attr); | |
414 | |
415 // The initial thread has a growable stack, and the size reported | |
416 // by pthread_attr_getstack is the maximum size it could possibly | |
417 // be given what currently mapped. This can be huge, so we cap it. | |
418 if (os::Bsd::is_initial_thread()) { | |
419 stack_bytes = stack_top - stack_bottom; | |
420 | |
421 if (stack_bytes > JavaThread::stack_size_at_create()) | |
422 stack_bytes = JavaThread::stack_size_at_create(); | |
423 | |
424 stack_bottom = stack_top - stack_bytes; | |
425 } | |
426 #endif | |
427 | |
428 assert(os::current_stack_pointer() >= stack_bottom, "should do"); | |
429 assert(os::current_stack_pointer() < stack_top, "should do"); | |
430 | |
431 *bottom = stack_bottom; | |
432 *size = stack_top - stack_bottom; | |
433 } | |
434 | |
435 address os::current_stack_base() { | |
436 address bottom; | |
437 size_t size; | |
438 current_stack_region(&bottom, &size); | |
439 return bottom + size; | |
440 } | |
441 | |
442 size_t os::current_stack_size() { | |
443 // stack size includes normal stack and HotSpot guard pages | |
444 address bottom; | |
445 size_t size; | |
446 current_stack_region(&bottom, &size); | |
447 return size; | |
448 } | |
449 | |
450 ///////////////////////////////////////////////////////////////////////////// | |
451 // helper functions for fatal error handler | |
452 | |
453 void os::print_context(outputStream* st, void* context) { | |
454 ShouldNotCallThis(); | |
455 } | |
456 | |
457 void os::print_register_info(outputStream *st, void *context) { | |
458 ShouldNotCallThis(); | |
459 } | |
460 | |
461 ///////////////////////////////////////////////////////////////////////////// | |
462 // Stubs for things that would be in bsd_zero.s if it existed. | |
463 // You probably want to disassemble these monkeys to check they're ok. | |
464 | |
465 extern "C" { | |
466 int SpinPause() { | |
467 } | |
468 | |
469 int SafeFetch32(int *adr, int errValue) { | |
470 int value = errValue; | |
471 value = *adr; | |
472 return value; | |
473 } | |
474 intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) { | |
475 intptr_t value = errValue; | |
476 value = *adr; | |
477 return value; | |
478 } | |
479 | |
480 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { | |
481 if (from > to) { | |
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 | |
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559 |
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560 #ifndef PRODUCT |
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561 void os::verify_stack_alignment() { |
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562 } |
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563 #endif |