Mercurial > hg > graal-compiler
annotate src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp @ 1623:fcbb92a1ab3b
Merge
author | jrose |
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date | Tue, 29 Jun 2010 16:09:57 -0700 |
parents | c18cbe5936b8 |
children | 1e9a9d2e6509 |
rev | line source |
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133 | 1 /* |
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2 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved. |
133 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
133 | 22 * |
23 */ | |
24 | |
25 // do not include precompiled header file | |
26 | |
27 #include "incls/_os_linux_sparc.cpp.incl" | |
28 | |
29 // Linux/Sparc has rather obscure naming of registers in sigcontext | |
30 // different between 32 and 64 bits | |
31 #ifdef _LP64 | |
32 #define SIG_PC(x) ((x)->sigc_regs.tpc) | |
33 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) | |
34 #define SIG_REGS(x) ((x)->sigc_regs) | |
35 #else | |
36 #define SIG_PC(x) ((x)->si_regs.pc) | |
37 #define SIG_NPC(x) ((x)->si_regs.npc) | |
38 #define SIG_REGS(x) ((x)->si_regs) | |
39 #endif | |
40 | |
41 // those are to reference registers in sigcontext | |
42 enum { | |
43 CON_G0 = 0, | |
44 CON_G1, | |
45 CON_G2, | |
46 CON_G3, | |
47 CON_G4, | |
48 CON_G5, | |
49 CON_G6, | |
50 CON_G7, | |
51 CON_O0, | |
52 CON_O1, | |
53 CON_O2, | |
54 CON_O3, | |
55 CON_O4, | |
56 CON_O5, | |
57 CON_O6, | |
58 CON_O7, | |
59 }; | |
60 | |
61 static inline void set_cont_address(sigcontext* ctx, address addr) { | |
62 SIG_PC(ctx) = (intptr_t)addr; | |
63 SIG_NPC(ctx) = (intptr_t)(addr+4); | |
64 } | |
65 | |
66 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
67 // currently interrupted by SIGPROF. | |
68 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested | |
69 // signal frames. Currently we don't do that on Linux, so it's the | |
70 // same as os::fetch_frame_from_context(). | |
71 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
72 ucontext_t* uc, | |
73 intptr_t** ret_sp, | |
74 intptr_t** ret_fp) { | |
75 assert(thread != NULL, "just checking"); | |
76 assert(ret_sp != NULL, "just checking"); | |
77 assert(ret_fp != NULL, "just checking"); | |
78 | |
79 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
80 } | |
81 | |
82 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
83 intptr_t** ret_sp, | |
84 intptr_t** ret_fp) { | |
85 ucontext_t* uc = (ucontext_t*) ucVoid; | |
86 ExtendedPC epc; | |
87 | |
88 if (uc != NULL) { | |
89 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
90 if (ret_sp) { | |
91 *ret_sp = os::Linux::ucontext_get_sp(uc); | |
92 } | |
93 if (ret_fp) { | |
94 *ret_fp = os::Linux::ucontext_get_fp(uc); | |
95 } | |
96 } else { | |
97 // construct empty ExtendedPC for return value checking | |
98 epc = ExtendedPC(NULL); | |
99 if (ret_sp) { | |
100 *ret_sp = (intptr_t*) NULL; | |
101 } | |
102 if (ret_fp) { | |
103 *ret_fp = (intptr_t*) NULL; | |
104 } | |
105 } | |
106 | |
107 return epc; | |
108 } | |
109 | |
110 frame os::fetch_frame_from_context(void* ucVoid) { | |
111 intptr_t* sp; | |
112 intptr_t* fp; | |
113 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
114 return frame(sp, fp, epc.pc()); | |
115 } | |
116 | |
117 frame os::get_sender_for_C_frame(frame* fr) { | |
118 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
119 } | |
120 | |
121 frame os::current_frame() { | |
122 fprintf(stderr, "current_frame()"); | |
123 | |
124 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
125 frame myframe(sp, frame::unpatchable, | |
126 CAST_FROM_FN_PTR(address, os::current_frame)); | |
127 if (os::is_first_C_frame(&myframe)) { | |
128 // stack is not walkable | |
129 return frame(NULL, frame::unpatchable, NULL); | |
130 } else { | |
131 return os::get_sender_for_C_frame(&myframe); | |
132 } | |
133 } | |
134 | |
135 address os::current_stack_pointer() { | |
136 register void *sp __asm__ ("sp"); | |
137 return (address)sp; | |
138 } | |
139 | |
140 static void current_stack_region(address* bottom, size_t* size) { | |
141 if (os::Linux::is_initial_thread()) { | |
142 // initial thread needs special handling because pthread_getattr_np() | |
143 // may return bogus value. | |
144 *bottom = os::Linux::initial_thread_stack_bottom(); | |
145 *size = os::Linux::initial_thread_stack_size(); | |
146 } else { | |
147 pthread_attr_t attr; | |
148 | |
149 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
150 | |
151 // JVM needs to know exact stack location, abort if it fails | |
152 if (rslt != 0) { | |
153 if (rslt == ENOMEM) { | |
154 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
155 } else { | |
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156 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
133 | 157 } |
158 } | |
159 | |
160 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { | |
161 fatal("Can not locate current stack attributes!"); | |
162 } | |
163 | |
164 pthread_attr_destroy(&attr); | |
165 } | |
166 assert(os::current_stack_pointer() >= *bottom && | |
167 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
168 } | |
169 | |
170 address os::current_stack_base() { | |
171 address bottom; | |
172 size_t size; | |
173 current_stack_region(&bottom, &size); | |
174 return bottom + size; | |
175 } | |
176 | |
177 size_t os::current_stack_size() { | |
178 // stack size includes normal stack and HotSpot guard pages | |
179 address bottom; | |
180 size_t size; | |
181 current_stack_region(&bottom, &size); | |
182 return size; | |
183 } | |
184 | |
185 char* os::non_memory_address_word() { | |
186 // Must never look like an address returned by reserve_memory, | |
187 // even in its subfields (as defined by the CPU immediate fields, | |
188 // if the CPU splits constants across multiple instructions). | |
189 // On SPARC, 0 != %hi(any real address), because there is no | |
190 // allocation in the first 1Kb of the virtual address space. | |
191 return (char*) 0; | |
192 } | |
193 | |
194 void os::initialize_thread() {} | |
195 | |
196 void os::print_context(outputStream *st, void *context) { | |
197 if (context == NULL) return; | |
198 | |
199 ucontext_t* uc = (ucontext_t*)context; | |
200 sigcontext* sc = (sigcontext*)context; | |
201 st->print_cr("Registers:"); | |
202 | |
203 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT | |
204 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, | |
205 SIG_REGS(sc).u_regs[CON_O0], | |
206 SIG_REGS(sc).u_regs[CON_O1], | |
207 SIG_REGS(sc).u_regs[CON_O2], | |
208 SIG_REGS(sc).u_regs[CON_O3]); | |
209 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT | |
210 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, | |
211 SIG_REGS(sc).u_regs[CON_O4], | |
212 SIG_REGS(sc).u_regs[CON_O5], | |
213 SIG_REGS(sc).u_regs[CON_O6], | |
214 SIG_REGS(sc).u_regs[CON_O7]); | |
215 | |
216 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT | |
217 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, | |
218 SIG_REGS(sc).u_regs[CON_G1], | |
219 SIG_REGS(sc).u_regs[CON_G2], | |
220 SIG_REGS(sc).u_regs[CON_G3], | |
221 SIG_REGS(sc).u_regs[CON_G4]); | |
222 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT | |
223 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, | |
224 SIG_REGS(sc).u_regs[CON_G5], | |
225 SIG_REGS(sc).u_regs[CON_G6], | |
226 SIG_REGS(sc).u_regs[CON_G7], | |
227 SIG_REGS(sc).y); | |
228 | |
229 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, | |
230 SIG_PC(sc), | |
231 SIG_NPC(sc)); | |
232 st->cr(); | |
233 st->cr(); | |
234 | |
235 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
236 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
237 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
238 st->cr(); | |
239 | |
240 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
241 // point to garbage if entry point in an nmethod is corrupted. Leave | |
242 // this at the end, and hope for the best. | |
243 address pc = os::Linux::ucontext_get_pc(uc); | |
244 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
245 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); | |
246 } | |
247 | |
248 | |
249 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
250 return (address) SIG_PC((sigcontext*)uc); | |
251 } | |
252 | |
253 intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { | |
254 return (intptr_t*) | |
255 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); | |
256 } | |
257 | |
258 // not used on Sparc | |
259 intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { | |
260 ShouldNotReachHere(); | |
261 return NULL; | |
262 } | |
263 | |
264 // Utility functions | |
265 | |
266 extern "C" void Fetch32PFI(); | |
267 extern "C" void Fetch32Resume(); | |
268 extern "C" void FetchNPFI(); | |
269 extern "C" void FetchNResume(); | |
270 | |
271 inline static bool checkPrefetch(sigcontext* uc, address pc) { | |
272 if (pc == (address) Fetch32PFI) { | |
273 set_cont_address(uc, address(Fetch32Resume)); | |
274 return true; | |
275 } | |
276 if (pc == (address) FetchNPFI) { | |
277 set_cont_address(uc, address(FetchNResume)); | |
278 return true; | |
279 } | |
280 return false; | |
281 } | |
282 | |
283 inline static bool checkOverflow(sigcontext* uc, | |
284 address pc, | |
285 address addr, | |
286 JavaThread* thread, | |
287 address* stub) { | |
288 // check if fault address is within thread stack | |
289 if (addr < thread->stack_base() && | |
290 addr >= thread->stack_base() - thread->stack_size()) { | |
291 // stack overflow | |
292 if (thread->in_stack_yellow_zone(addr)) { | |
293 thread->disable_stack_yellow_zone(); | |
294 if (thread->thread_state() == _thread_in_Java) { | |
295 // Throw a stack overflow exception. Guard pages will be reenabled | |
296 // while unwinding the stack. | |
297 *stub = | |
298 SharedRuntime::continuation_for_implicit_exception(thread, | |
299 pc, | |
300 SharedRuntime::STACK_OVERFLOW); | |
301 } else { | |
302 // Thread was in the vm or native code. Return and try to finish. | |
303 return true; | |
304 } | |
305 } else if (thread->in_stack_red_zone(addr)) { | |
306 // Fatal red zone violation. Disable the guard pages and fall through | |
307 // to handle_unexpected_exception way down below. | |
308 thread->disable_stack_red_zone(); | |
309 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
310 } else { | |
311 // Accessing stack address below sp may cause SEGV if current | |
312 // thread has MAP_GROWSDOWN stack. This should only happen when | |
313 // current thread was created by user code with MAP_GROWSDOWN flag | |
314 // and then attached to VM. See notes in os_linux.cpp. | |
315 if (thread->osthread()->expanding_stack() == 0) { | |
316 thread->osthread()->set_expanding_stack(); | |
317 if (os::Linux::manually_expand_stack(thread, addr)) { | |
318 thread->osthread()->clear_expanding_stack(); | |
319 return true; | |
320 } | |
321 thread->osthread()->clear_expanding_stack(); | |
322 } else { | |
323 fatal("recursive segv. expanding stack."); | |
324 } | |
325 } | |
326 } | |
327 return false; | |
328 } | |
329 | |
330 inline static bool checkPollingPage(address pc, address fault, address* stub) { | |
331 if (fault == os::get_polling_page()) { | |
332 *stub = SharedRuntime::get_poll_stub(pc); | |
333 return true; | |
334 } | |
335 return false; | |
336 } | |
337 | |
338 inline static bool checkByteBuffer(address pc, address* stub) { | |
339 // BugId 4454115: A read from a MappedByteBuffer can fault | |
340 // here if the underlying file has been truncated. | |
341 // Do not crash the VM in such a case. | |
342 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
343 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
344 if (nm != NULL && nm->has_unsafe_access()) { | |
345 *stub = StubRoutines::handler_for_unsafe_access(); | |
346 return true; | |
347 } | |
348 return false; | |
349 } | |
350 | |
351 inline static bool checkVerifyOops(address pc, address fault, address* stub) { | |
352 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] | |
353 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { | |
354 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; | |
355 warning("fixed up memory fault in +VerifyOops at address " | |
356 INTPTR_FORMAT, fault); | |
357 return true; | |
358 } | |
359 return false; | |
360 } | |
361 | |
362 inline static bool checkFPFault(address pc, int code, | |
363 JavaThread* thread, address* stub) { | |
364 if (code == FPE_INTDIV || code == FPE_FLTDIV) { | |
365 *stub = | |
366 SharedRuntime:: | |
367 continuation_for_implicit_exception(thread, | |
368 pc, | |
369 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
370 return true; | |
371 } | |
372 return false; | |
373 } | |
374 | |
375 inline static bool checkNullPointer(address pc, intptr_t fault, | |
376 JavaThread* thread, address* stub) { | |
377 if (!MacroAssembler::needs_explicit_null_check(fault)) { | |
378 // Determination of interpreter/vtable stub/compiled code null | |
379 // exception | |
380 *stub = | |
381 SharedRuntime:: | |
382 continuation_for_implicit_exception(thread, pc, | |
383 SharedRuntime::IMPLICIT_NULL); | |
384 return true; | |
385 } | |
386 return false; | |
387 } | |
388 | |
389 inline static bool checkFastJNIAccess(address pc, address* stub) { | |
390 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
391 if (addr != (address)-1) { | |
392 *stub = addr; | |
393 return true; | |
394 } | |
395 return false; | |
396 } | |
397 | |
398 inline static bool checkSerializePage(JavaThread* thread, address addr) { | |
399 return os::is_memory_serialize_page(thread, addr); | |
400 } | |
401 | |
402 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { | |
403 if (nativeInstruction_at(*pc)->is_zombie()) { | |
404 // zombie method (ld [%g0],%o7 instruction) | |
405 *stub = SharedRuntime::get_handle_wrong_method_stub(); | |
406 | |
407 // At the stub it needs to look like a call from the caller of this | |
408 // method (not a call from the segv site). | |
409 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
410 return true; | |
411 } | |
412 return false; | |
413 } | |
414 | |
415 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { | |
416 #ifdef COMPILER2 | |
417 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { | |
418 #ifdef ASSERT | |
419 #ifdef TIERED | |
420 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
421 assert(cb->is_compiled_by_c2(), "Wrong compiler"); | |
422 #endif // TIERED | |
423 #endif // ASSERT | |
424 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. | |
425 *stub = SharedRuntime::get_ic_miss_stub(); | |
426 // At the stub it needs to look like a call from the caller of this | |
427 // method (not a call from the segv site). | |
428 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
429 return true; | |
430 } | |
431 #endif // COMPILER2 | |
432 return false; | |
433 } | |
434 | |
435 extern "C" int | |
436 JVM_handle_linux_signal(int sig, | |
437 siginfo_t* info, | |
438 void* ucVoid, | |
439 int abort_if_unrecognized) { | |
440 // in fact this isn't ucontext_t* at all, but struct sigcontext* | |
441 // but Linux porting layer uses ucontext_t, so to minimize code change | |
442 // we cast as needed | |
443 ucontext_t* ucFake = (ucontext_t*) ucVoid; | |
444 sigcontext* uc = (sigcontext*)ucVoid; | |
445 | |
446 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
447 | |
448 SignalHandlerMark shm(t); | |
449 | |
450 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
451 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
452 // or have a SIGILL handler when detecting CPU type). When that happens, | |
453 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
454 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
455 // that do not require siginfo/ucontext first. | |
456 | |
457 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
458 // allow chained handler to go first | |
459 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
460 return true; | |
461 } else { | |
462 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
463 char buf[64]; | |
464 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
465 os::exception_name(sig, buf, sizeof(buf))); | |
466 } | |
467 return true; | |
468 } | |
469 } | |
470 | |
471 JavaThread* thread = NULL; | |
472 VMThread* vmthread = NULL; | |
473 if (os::Linux::signal_handlers_are_installed) { | |
474 if (t != NULL ){ | |
475 if(t->is_Java_thread()) { | |
476 thread = (JavaThread*)t; | |
477 } | |
478 else if(t->is_VM_thread()){ | |
479 vmthread = (VMThread *)t; | |
480 } | |
481 } | |
482 } | |
483 | |
484 // decide if this trap can be handled by a stub | |
485 address stub = NULL; | |
486 address pc = NULL; | |
487 address npc = NULL; | |
488 | |
489 //%note os_trap_1 | |
490 if (info != NULL && uc != NULL && thread != NULL) { | |
491 pc = address(SIG_PC(uc)); | |
492 npc = address(SIG_NPC(uc)); | |
493 | |
494 // Check to see if we caught the safepoint code in the | |
495 // process of write protecting the memory serialization page. | |
496 // It write enables the page immediately after protecting it | |
497 // so we can just return to retry the write. | |
498 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { | |
499 // Block current thread until the memory serialize page permission restored. | |
500 os::block_on_serialize_page_trap(); | |
501 return 1; | |
502 } | |
503 | |
504 if (checkPrefetch(uc, pc)) { | |
505 return 1; | |
506 } | |
507 | |
508 // Handle ALL stack overflow variations here | |
509 if (sig == SIGSEGV) { | |
510 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { | |
511 return 1; | |
512 } | |
513 } | |
514 | |
515 if (sig == SIGBUS && | |
516 thread->thread_state() == _thread_in_vm && | |
517 thread->doing_unsafe_access()) { | |
518 stub = StubRoutines::handler_for_unsafe_access(); | |
519 } | |
520 | |
521 if (thread->thread_state() == _thread_in_Java) { | |
522 do { | |
523 // Java thread running in Java code => find exception handler if any | |
524 // a fault inside compiled code, the interpreter, or a stub | |
525 | |
526 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { | |
527 break; | |
528 } | |
529 | |
530 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { | |
531 break; | |
532 } | |
533 | |
534 if ((sig == SIGSEGV || sig == SIGBUS) && | |
535 checkVerifyOops(pc, (address)info->si_addr, &stub)) { | |
536 break; | |
537 } | |
538 | |
539 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { | |
540 break; | |
541 } | |
542 | |
543 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { | |
544 break; | |
545 } | |
546 | |
547 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { | |
548 break; | |
549 } | |
550 | |
551 if ((sig == SIGSEGV) && | |
552 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { | |
553 break; | |
554 } | |
555 } while (0); | |
556 | |
557 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
558 // and the heap gets shrunk before the field access. | |
559 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
560 checkFastJNIAccess(pc, &stub); | |
561 } | |
562 } | |
563 | |
564 if (stub != NULL) { | |
565 // save all thread context in case we need to restore it | |
566 thread->set_saved_exception_pc(pc); | |
567 thread->set_saved_exception_npc(npc); | |
568 set_cont_address(uc, stub); | |
569 return true; | |
570 } | |
571 } | |
572 | |
573 // signal-chaining | |
574 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
575 return true; | |
576 } | |
577 | |
578 if (!abort_if_unrecognized) { | |
579 // caller wants another chance, so give it to him | |
580 return false; | |
581 } | |
582 | |
583 if (pc == NULL && uc != NULL) { | |
584 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); | |
585 } | |
586 | |
587 // unmask current signal | |
588 sigset_t newset; | |
589 sigemptyset(&newset); | |
590 sigaddset(&newset, sig); | |
591 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
592 | |
593 VMError err(t, sig, pc, info, ucVoid); | |
594 err.report_and_die(); | |
595 | |
596 ShouldNotReachHere(); | |
597 } | |
598 | |
599 void os::Linux::init_thread_fpu_state(void) { | |
600 // Nothing to do | |
601 } | |
602 | |
603 int os::Linux::get_fpu_control_word() { | |
604 return 0; | |
605 } | |
606 | |
607 void os::Linux::set_fpu_control_word(int fpu) { | |
608 // nothing | |
609 } | |
610 | |
611 bool os::is_allocatable(size_t bytes) { | |
612 #ifdef _LP64 | |
613 return true; | |
614 #else | |
615 if (bytes < 2 * G) { | |
616 return true; | |
617 } | |
618 | |
619 char* addr = reserve_memory(bytes, NULL); | |
620 | |
621 if (addr != NULL) { | |
622 release_memory(addr, bytes); | |
623 } | |
624 | |
625 return addr != NULL; | |
626 #endif // _LP64 | |
627 } | |
628 | |
629 /////////////////////////////////////////////////////////////////////////////// | |
630 // thread stack | |
631 | |
632 size_t os::Linux::min_stack_allowed = 128 * K; | |
633 | |
634 // pthread on Ubuntu is always in floating stack mode | |
635 bool os::Linux::supports_variable_stack_size() { return true; } | |
636 | |
637 // return default stack size for thr_type | |
638 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
639 // default stack size (compiler thread needs larger stack) | |
640 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
641 return s; | |
642 } | |
643 | |
644 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
645 // Creating guard page is very expensive. Java thread has HotSpot | |
646 // guard page, only enable glibc guard page for non-Java threads. | |
647 return (thr_type == java_thread ? 0 : page_size()); | |
648 } |