Mercurial > hg > truffle
annotate src/os_cpu/linux_zero/vm/os_linux_zero.cpp @ 1378:9f5b60a14736
6939930: exception unwind changes in 6919934 hurts compilation speed
Reviewed-by: twisti
author | never |
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date | Thu, 15 Apr 2010 18:14:49 -0700 |
parents | d11ce1551e8d |
children | 67d74f7a15d9 |
rev | line source |
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1010 | 1 /* |
2 * Copyright 2003-2007 Sun Microsystems, Inc. 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 * | |
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
21 * CA 95054 USA or visit www.sun.com if you need additional information or | |
22 * have any questions. | |
23 * | |
24 */ | |
25 | |
26 // do not include precompiled header file | |
27 #include "incls/_os_linux_zero.cpp.incl" | |
28 | |
29 address os::current_stack_pointer() { | |
30 address dummy = (address) &dummy; | |
31 return dummy; | |
32 } | |
33 | |
34 frame os::get_sender_for_C_frame(frame* fr) { | |
35 ShouldNotCallThis(); | |
36 } | |
37 | |
38 frame os::current_frame() { | |
39 // The only thing that calls this is the stack printing code in | |
40 // VMError::report: | |
41 // - Step 110 (printing stack bounds) uses the sp in the frame | |
42 // to determine the amount of free space on the stack. We | |
43 // set the sp to a close approximation of the real value in | |
44 // order to allow this step to complete. | |
45 // - Step 120 (printing native stack) tries to walk the stack. | |
46 // The frame we create has a NULL pc, which is ignored as an | |
47 // invalid frame. | |
48 frame dummy = frame(); | |
49 dummy.set_sp((intptr_t *) current_stack_pointer()); | |
50 return dummy; | |
51 } | |
52 | |
53 char* os::non_memory_address_word() { | |
54 // Must never look like an address returned by reserve_memory, | |
55 // even in its subfields (as defined by the CPU immediate fields, | |
56 // if the CPU splits constants across multiple instructions). | |
57 #ifdef SPARC | |
58 // On SPARC, 0 != %hi(any real address), because there is no | |
59 // allocation in the first 1Kb of the virtual address space. | |
60 return (char *) 0; | |
61 #else | |
62 // This is the value for x86; works pretty well for PPC too. | |
63 return (char *) -1; | |
64 #endif // SPARC | |
65 } | |
66 | |
67 void os::initialize_thread() { | |
68 // Nothing to do. | |
69 } | |
70 | |
71 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
72 ShouldNotCallThis(); | |
73 } | |
74 | |
75 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
76 intptr_t** ret_sp, | |
77 intptr_t** ret_fp) { | |
78 ShouldNotCallThis(); | |
79 } | |
80 | |
81 frame os::fetch_frame_from_context(void* ucVoid) { | |
82 ShouldNotCallThis(); | |
83 } | |
84 | |
85 extern "C" int | |
86 JVM_handle_linux_signal(int sig, | |
87 siginfo_t* info, | |
88 void* ucVoid, | |
89 int abort_if_unrecognized) { | |
90 ucontext_t* uc = (ucontext_t*) ucVoid; | |
91 | |
92 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
93 | |
94 SignalHandlerMark shm(t); | |
95 | |
96 // Note: it's not uncommon that JNI code uses signal/sigset to | |
97 // install then restore certain signal handler (e.g. to temporarily | |
98 // block SIGPIPE, or have a SIGILL handler when detecting CPU | |
99 // type). When that happens, JVM_handle_linux_signal() might be | |
100 // invoked with junk info/ucVoid. To avoid unnecessary crash when | |
101 // libjsig is not preloaded, try handle signals that do not require | |
102 // siginfo/ucontext first. | |
103 | |
104 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
105 // allow chained handler to go first | |
106 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
107 return true; | |
108 } else { | |
109 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
110 char buf[64]; | |
111 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
112 os::exception_name(sig, buf, sizeof(buf))); | |
113 } | |
114 return true; | |
115 } | |
116 } | |
117 | |
118 JavaThread* thread = NULL; | |
119 VMThread* vmthread = NULL; | |
120 if (os::Linux::signal_handlers_are_installed) { | |
121 if (t != NULL ){ | |
122 if(t->is_Java_thread()) { | |
123 thread = (JavaThread*)t; | |
124 } | |
125 else if(t->is_VM_thread()){ | |
126 vmthread = (VMThread *)t; | |
127 } | |
128 } | |
129 } | |
130 | |
131 if (info != NULL && thread != NULL) { | |
132 // Handle ALL stack overflow variations here | |
133 if (sig == SIGSEGV) { | |
134 address addr = (address) info->si_addr; | |
135 | |
136 // check if fault address is within thread stack | |
137 if (addr < thread->stack_base() && | |
138 addr >= thread->stack_base() - thread->stack_size()) { | |
139 // stack overflow | |
140 if (thread->in_stack_yellow_zone(addr)) { | |
141 thread->disable_stack_yellow_zone(); | |
142 ShouldNotCallThis(); | |
143 } | |
144 else if (thread->in_stack_red_zone(addr)) { | |
145 thread->disable_stack_red_zone(); | |
146 ShouldNotCallThis(); | |
147 } | |
148 else { | |
149 // Accessing stack address below sp may cause SEGV if | |
150 // current thread has MAP_GROWSDOWN stack. This should | |
151 // only happen when current thread was created by user | |
152 // code with MAP_GROWSDOWN flag and then attached to VM. | |
153 // See notes in os_linux.cpp. | |
154 if (thread->osthread()->expanding_stack() == 0) { | |
155 thread->osthread()->set_expanding_stack(); | |
156 if (os::Linux::manually_expand_stack(thread, addr)) { | |
157 thread->osthread()->clear_expanding_stack(); | |
158 return true; | |
159 } | |
160 thread->osthread()->clear_expanding_stack(); | |
161 } | |
162 else { | |
163 fatal("recursive segv. expanding stack."); | |
164 } | |
165 } | |
166 } | |
167 } | |
168 | |
169 /*if (thread->thread_state() == _thread_in_Java) { | |
170 ShouldNotCallThis(); | |
171 } | |
172 else*/ if (thread->thread_state() == _thread_in_vm && | |
173 sig == SIGBUS && thread->doing_unsafe_access()) { | |
174 ShouldNotCallThis(); | |
175 } | |
176 | |
177 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC | |
178 // kicks in and the heap gets shrunk before the field access. | |
179 /*if (sig == SIGSEGV || sig == SIGBUS) { | |
180 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
181 if (addr != (address)-1) { | |
182 stub = addr; | |
183 } | |
184 }*/ | |
185 | |
186 // Check to see if we caught the safepoint code in the process | |
187 // of write protecting the memory serialization page. It write | |
188 // enables the page immediately after protecting it so we can | |
189 // just return to retry the write. | |
190 if (sig == SIGSEGV && | |
191 os::is_memory_serialize_page(thread, (address) info->si_addr)) { | |
192 // Block current thread until permission is restored. | |
193 os::block_on_serialize_page_trap(); | |
194 return true; | |
195 } | |
196 } | |
197 | |
198 // signal-chaining | |
199 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
200 return true; | |
201 } | |
202 | |
203 if (!abort_if_unrecognized) { | |
204 // caller wants another chance, so give it to him | |
205 return false; | |
206 } | |
207 | |
208 #ifndef PRODUCT | |
209 if (sig == SIGSEGV) { | |
210 fatal("\n#" | |
211 "\n# /--------------------\\" | |
212 "\n# | segmentation fault |" | |
213 "\n# \\---\\ /--------------/" | |
214 "\n# /" | |
215 "\n# [-] |\\_/| " | |
216 "\n# (+)=C |o o|__ " | |
217 "\n# | | =-*-=__\\ " | |
218 "\n# OOO c_c_(___)"); | |
219 } | |
220 #endif // !PRODUCT | |
221 | |
222 const char *fmt = "caught unhandled signal %d"; | |
223 char buf[64]; | |
224 | |
225 sprintf(buf, fmt, sig); | |
226 fatal(buf); | |
227 } | |
228 | |
229 void os::Linux::init_thread_fpu_state(void) { | |
230 // Nothing to do | |
231 } | |
232 | |
233 int os::Linux::get_fpu_control_word() { | |
234 ShouldNotCallThis(); | |
235 } | |
236 | |
237 void os::Linux::set_fpu_control_word(int fpu) { | |
238 ShouldNotCallThis(); | |
239 } | |
240 | |
241 bool os::is_allocatable(size_t bytes) { | |
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242 #ifdef _LP64 |
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243 return true; |
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244 #else |
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245 if (bytes < 2 * G) { |
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246 return true; |
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247 } |
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248 |
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249 char* addr = reserve_memory(bytes, NULL); |
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250 |
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251 if (addr != NULL) { |
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252 release_memory(addr, bytes); |
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253 } |
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254 |
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255 return addr != NULL; |
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256 #endif // _LP64 |
1010 | 257 } |
258 | |
259 /////////////////////////////////////////////////////////////////////////////// | |
260 // thread stack | |
261 | |
262 size_t os::Linux::min_stack_allowed = 64 * K; | |
263 | |
264 bool os::Linux::supports_variable_stack_size() { | |
265 return true; | |
266 } | |
267 | |
268 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
269 #ifdef _LP64 | |
270 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
271 #else | |
272 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); | |
273 #endif // _LP64 | |
274 return s; | |
275 } | |
276 | |
277 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
278 // Only enable glibc guard pages for non-Java threads | |
279 // (Java threads have HotSpot guard pages) | |
280 return (thr_type == java_thread ? 0 : page_size()); | |
281 } | |
282 | |
283 static void current_stack_region(address *bottom, size_t *size) { | |
284 pthread_attr_t attr; | |
285 int res = pthread_getattr_np(pthread_self(), &attr); | |
286 if (res != 0) { | |
287 if (res == ENOMEM) { | |
288 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
289 } | |
290 else { | |
291 fatal1("pthread_getattr_np failed with errno = %d", res); | |
292 } | |
293 } | |
294 | |
295 address stack_bottom; | |
296 size_t stack_bytes; | |
297 res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes); | |
298 if (res != 0) { | |
299 fatal1("pthread_attr_getstack failed with errno = %d", res); | |
300 } | |
301 address stack_top = stack_bottom + stack_bytes; | |
302 | |
303 // The block of memory returned by pthread_attr_getstack() includes | |
304 // guard pages where present. We need to trim these off. | |
305 size_t page_bytes = os::Linux::page_size(); | |
306 assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack"); | |
307 | |
308 size_t guard_bytes; | |
309 res = pthread_attr_getguardsize(&attr, &guard_bytes); | |
310 if (res != 0) { | |
311 fatal1("pthread_attr_getguardsize failed with errno = %d", res); | |
312 } | |
313 int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes; | |
314 assert(guard_bytes == guard_pages * page_bytes, "unaligned guard"); | |
315 | |
316 #ifdef IA64 | |
317 // IA64 has two stacks sharing the same area of memory, a normal | |
318 // stack growing downwards and a register stack growing upwards. | |
319 // Guard pages, if present, are in the centre. This code splits | |
320 // the stack in two even without guard pages, though in theory | |
321 // there's nothing to stop us allocating more to the normal stack | |
322 // or more to the register stack if one or the other were found | |
323 // to grow faster. | |
324 int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes; | |
325 stack_bottom += (total_pages - guard_pages) / 2 * page_bytes; | |
326 #endif // IA64 | |
327 | |
328 stack_bottom += guard_bytes; | |
329 | |
330 pthread_attr_destroy(&attr); | |
331 | |
332 // The initial thread has a growable stack, and the size reported | |
333 // by pthread_attr_getstack is the maximum size it could possibly | |
334 // be given what currently mapped. This can be huge, so we cap it. | |
335 if (os::Linux::is_initial_thread()) { | |
336 stack_bytes = stack_top - stack_bottom; | |
337 | |
338 if (stack_bytes > JavaThread::stack_size_at_create()) | |
339 stack_bytes = JavaThread::stack_size_at_create(); | |
340 | |
341 stack_bottom = stack_top - stack_bytes; | |
342 } | |
343 | |
344 assert(os::current_stack_pointer() >= stack_bottom, "should do"); | |
345 assert(os::current_stack_pointer() < stack_top, "should do"); | |
346 | |
347 *bottom = stack_bottom; | |
348 *size = stack_top - stack_bottom; | |
349 } | |
350 | |
351 address os::current_stack_base() { | |
352 address bottom; | |
353 size_t size; | |
354 current_stack_region(&bottom, &size); | |
355 return bottom + size; | |
356 } | |
357 | |
358 size_t os::current_stack_size() { | |
359 // stack size includes normal stack and HotSpot guard pages | |
360 address bottom; | |
361 size_t size; | |
362 current_stack_region(&bottom, &size); | |
363 return size; | |
364 } | |
365 | |
366 ///////////////////////////////////////////////////////////////////////////// | |
367 // helper functions for fatal error handler | |
368 | |
369 void os::print_context(outputStream* st, void* context) { | |
370 ShouldNotCallThis(); | |
371 } | |
372 | |
373 ///////////////////////////////////////////////////////////////////////////// | |
374 // Stubs for things that would be in linux_zero.s if it existed. | |
375 // You probably want to disassemble these monkeys to check they're ok. | |
376 | |
377 extern "C" { | |
378 int SpinPause() { | |
379 } | |
380 | |
381 int SafeFetch32(int *adr, int errValue) { | |
382 int value = errValue; | |
383 value = *adr; | |
384 return value; | |
385 } | |
386 intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) { | |
387 intptr_t value = errValue; | |
388 value = *adr; | |
389 return value; | |
390 } | |
391 | |
392 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { | |
393 if (from > to) { | |
394 jshort *end = from + count; | |
395 while (from < end) | |
396 *(to++) = *(from++); | |
397 } | |
398 else if (from < to) { | |
399 jshort *end = from; | |
400 from += count - 1; | |
401 to += count - 1; | |
402 while (from >= end) | |
403 *(to--) = *(from--); | |
404 } | |
405 } | |
406 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { | |
407 if (from > to) { | |
408 jint *end = from + count; | |
409 while (from < end) | |
410 *(to++) = *(from++); | |
411 } | |
412 else if (from < to) { | |
413 jint *end = from; | |
414 from += count - 1; | |
415 to += count - 1; | |
416 while (from >= end) | |
417 *(to--) = *(from--); | |
418 } | |
419 } | |
420 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { | |
421 if (from > to) { | |
422 jlong *end = from + count; | |
423 while (from < end) | |
424 os::atomic_copy64(from++, to++); | |
425 } | |
426 else if (from < to) { | |
427 jlong *end = from; | |
428 from += count - 1; | |
429 to += count - 1; | |
430 while (from >= end) | |
431 os::atomic_copy64(from--, to--); | |
432 } | |
433 } | |
434 | |
435 void _Copy_arrayof_conjoint_bytes(HeapWord* from, | |
436 HeapWord* to, | |
437 size_t count) { | |
438 ShouldNotCallThis(); | |
439 } | |
440 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, | |
441 HeapWord* to, | |
442 size_t count) { | |
443 ShouldNotCallThis(); | |
444 } | |
445 void _Copy_arrayof_conjoint_jints(HeapWord* from, | |
446 HeapWord* to, | |
447 size_t count) { | |
448 ShouldNotCallThis(); | |
449 } | |
450 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, | |
451 HeapWord* to, | |
452 size_t count) { | |
453 ShouldNotCallThis(); | |
454 } | |
455 }; | |
456 | |
457 ///////////////////////////////////////////////////////////////////////////// | |
458 // Implementations of atomic operations not supported by processors. | |
459 // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html | |
460 | |
461 #ifndef _LP64 | |
462 extern "C" { | |
463 long long unsigned int __sync_val_compare_and_swap_8( | |
464 volatile void *ptr, | |
465 long long unsigned int oldval, | |
466 long long unsigned int newval) { | |
467 ShouldNotCallThis(); | |
468 } | |
469 }; | |
470 #endif // !_LP64 |