Mercurial > hg > truffle
annotate src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp @ 12700:4b053442b9d1
Do not compress graph when debug is enabled
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 06 Nov 2013 16:41:07 +0100 |
parents | e16282db4946 |
children | d70a665e25d7 |
rev | line source |
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3960 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
3960 | 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 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 // no precompiled headers | |
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26 #include "asm/macroAssembler.hpp" |
3960 | 27 #include "classfile/classLoader.hpp" |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/icBuffer.hpp" | |
31 #include "code/vtableStubs.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "jvm_bsd.h" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "mutex_bsd.inline.hpp" | |
36 #include "os_share_bsd.hpp" | |
37 #include "prims/jniFastGetField.hpp" | |
38 #include "prims/jvm.h" | |
39 #include "prims/jvm_misc.hpp" | |
40 #include "runtime/arguments.hpp" | |
41 #include "runtime/extendedPC.hpp" | |
42 #include "runtime/frame.inline.hpp" | |
43 #include "runtime/interfaceSupport.hpp" | |
44 #include "runtime/java.hpp" | |
45 #include "runtime/javaCalls.hpp" | |
46 #include "runtime/mutexLocker.hpp" | |
47 #include "runtime/osThread.hpp" | |
48 #include "runtime/sharedRuntime.hpp" | |
49 #include "runtime/stubRoutines.hpp" | |
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50 #include "runtime/thread.inline.hpp" |
3960 | 51 #include "runtime/timer.hpp" |
52 #include "utilities/events.hpp" | |
53 #include "utilities/vmError.hpp" | |
54 | |
55 // put OS-includes here | |
56 # include <sys/types.h> | |
57 # include <sys/mman.h> | |
58 # include <pthread.h> | |
59 # include <signal.h> | |
60 # include <errno.h> | |
61 # include <dlfcn.h> | |
62 # include <stdlib.h> | |
63 # include <stdio.h> | |
64 # include <unistd.h> | |
65 # include <sys/resource.h> | |
66 # include <pthread.h> | |
67 # include <sys/stat.h> | |
68 # include <sys/time.h> | |
69 # include <sys/utsname.h> | |
70 # include <sys/socket.h> | |
71 # include <sys/wait.h> | |
72 # include <pwd.h> | |
73 # include <poll.h> | |
74 #ifndef __OpenBSD__ | |
75 # include <ucontext.h> | |
76 #endif | |
77 | |
6918 | 78 #if !defined(__APPLE__) && !defined(__NetBSD__) |
3960 | 79 # include <pthread_np.h> |
80 #endif | |
81 | |
82 #ifdef AMD64 | |
83 #define SPELL_REG_SP "rsp" | |
84 #define SPELL_REG_FP "rbp" | |
85 #else | |
86 #define SPELL_REG_SP "esp" | |
87 #define SPELL_REG_FP "ebp" | |
88 #endif // AMD64 | |
89 | |
90 #ifdef __FreeBSD__ | |
91 # define context_trapno uc_mcontext.mc_trapno | |
92 # ifdef AMD64 | |
93 # define context_pc uc_mcontext.mc_rip | |
94 # define context_sp uc_mcontext.mc_rsp | |
95 # define context_fp uc_mcontext.mc_rbp | |
96 # define context_rip uc_mcontext.mc_rip | |
97 # define context_rsp uc_mcontext.mc_rsp | |
98 # define context_rbp uc_mcontext.mc_rbp | |
99 # define context_rax uc_mcontext.mc_rax | |
100 # define context_rbx uc_mcontext.mc_rbx | |
101 # define context_rcx uc_mcontext.mc_rcx | |
102 # define context_rdx uc_mcontext.mc_rdx | |
103 # define context_rsi uc_mcontext.mc_rsi | |
104 # define context_rdi uc_mcontext.mc_rdi | |
105 # define context_r8 uc_mcontext.mc_r8 | |
106 # define context_r9 uc_mcontext.mc_r9 | |
107 # define context_r10 uc_mcontext.mc_r10 | |
108 # define context_r11 uc_mcontext.mc_r11 | |
109 # define context_r12 uc_mcontext.mc_r12 | |
110 # define context_r13 uc_mcontext.mc_r13 | |
111 # define context_r14 uc_mcontext.mc_r14 | |
112 # define context_r15 uc_mcontext.mc_r15 | |
113 # define context_flags uc_mcontext.mc_flags | |
114 # define context_err uc_mcontext.mc_err | |
115 # else | |
116 # define context_pc uc_mcontext.mc_eip | |
117 # define context_sp uc_mcontext.mc_esp | |
118 # define context_fp uc_mcontext.mc_ebp | |
119 # define context_eip uc_mcontext.mc_eip | |
120 # define context_esp uc_mcontext.mc_esp | |
121 # define context_eax uc_mcontext.mc_eax | |
122 # define context_ebx uc_mcontext.mc_ebx | |
123 # define context_ecx uc_mcontext.mc_ecx | |
124 # define context_edx uc_mcontext.mc_edx | |
125 # define context_ebp uc_mcontext.mc_ebp | |
126 # define context_esi uc_mcontext.mc_esi | |
127 # define context_edi uc_mcontext.mc_edi | |
128 # define context_eflags uc_mcontext.mc_eflags | |
129 # define context_trapno uc_mcontext.mc_trapno | |
130 # endif | |
131 #endif | |
132 | |
133 #ifdef __APPLE__ | |
134 # if __DARWIN_UNIX03 && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5) | |
135 // 10.5 UNIX03 member name prefixes | |
136 #define DU3_PREFIX(s, m) __ ## s.__ ## m | |
137 # else | |
138 #define DU3_PREFIX(s, m) s ## . ## m | |
139 # endif | |
140 | |
141 # ifdef AMD64 | |
142 # define context_pc context_rip | |
143 # define context_sp context_rsp | |
144 # define context_fp context_rbp | |
145 # define context_rip uc_mcontext->DU3_PREFIX(ss,rip) | |
146 # define context_rsp uc_mcontext->DU3_PREFIX(ss,rsp) | |
147 # define context_rax uc_mcontext->DU3_PREFIX(ss,rax) | |
148 # define context_rbx uc_mcontext->DU3_PREFIX(ss,rbx) | |
149 # define context_rcx uc_mcontext->DU3_PREFIX(ss,rcx) | |
150 # define context_rdx uc_mcontext->DU3_PREFIX(ss,rdx) | |
151 # define context_rbp uc_mcontext->DU3_PREFIX(ss,rbp) | |
152 # define context_rsi uc_mcontext->DU3_PREFIX(ss,rsi) | |
153 # define context_rdi uc_mcontext->DU3_PREFIX(ss,rdi) | |
154 # define context_r8 uc_mcontext->DU3_PREFIX(ss,r8) | |
155 # define context_r9 uc_mcontext->DU3_PREFIX(ss,r9) | |
156 # define context_r10 uc_mcontext->DU3_PREFIX(ss,r10) | |
157 # define context_r11 uc_mcontext->DU3_PREFIX(ss,r11) | |
158 # define context_r12 uc_mcontext->DU3_PREFIX(ss,r12) | |
159 # define context_r13 uc_mcontext->DU3_PREFIX(ss,r13) | |
160 # define context_r14 uc_mcontext->DU3_PREFIX(ss,r14) | |
161 # define context_r15 uc_mcontext->DU3_PREFIX(ss,r15) | |
162 # define context_flags uc_mcontext->DU3_PREFIX(ss,rflags) | |
163 # define context_trapno uc_mcontext->DU3_PREFIX(es,trapno) | |
164 # define context_err uc_mcontext->DU3_PREFIX(es,err) | |
165 # else | |
166 # define context_pc context_eip | |
167 # define context_sp context_esp | |
168 # define context_fp context_ebp | |
169 # define context_eip uc_mcontext->DU3_PREFIX(ss,eip) | |
170 # define context_esp uc_mcontext->DU3_PREFIX(ss,esp) | |
171 # define context_eax uc_mcontext->DU3_PREFIX(ss,eax) | |
172 # define context_ebx uc_mcontext->DU3_PREFIX(ss,ebx) | |
173 # define context_ecx uc_mcontext->DU3_PREFIX(ss,ecx) | |
174 # define context_edx uc_mcontext->DU3_PREFIX(ss,edx) | |
175 # define context_ebp uc_mcontext->DU3_PREFIX(ss,ebp) | |
176 # define context_esi uc_mcontext->DU3_PREFIX(ss,esi) | |
177 # define context_edi uc_mcontext->DU3_PREFIX(ss,edi) | |
178 # define context_eflags uc_mcontext->DU3_PREFIX(ss,eflags) | |
179 # define context_trapno uc_mcontext->DU3_PREFIX(es,trapno) | |
180 # endif | |
181 #endif | |
182 | |
183 #ifdef __OpenBSD__ | |
184 # define context_trapno sc_trapno | |
185 # ifdef AMD64 | |
186 # define context_pc sc_rip | |
187 # define context_sp sc_rsp | |
188 # define context_fp sc_rbp | |
189 # define context_rip sc_rip | |
190 # define context_rsp sc_rsp | |
191 # define context_rbp sc_rbp | |
192 # define context_rax sc_rax | |
193 # define context_rbx sc_rbx | |
194 # define context_rcx sc_rcx | |
195 # define context_rdx sc_rdx | |
196 # define context_rsi sc_rsi | |
197 # define context_rdi sc_rdi | |
198 # define context_r8 sc_r8 | |
199 # define context_r9 sc_r9 | |
200 # define context_r10 sc_r10 | |
201 # define context_r11 sc_r11 | |
202 # define context_r12 sc_r12 | |
203 # define context_r13 sc_r13 | |
204 # define context_r14 sc_r14 | |
205 # define context_r15 sc_r15 | |
206 # define context_flags sc_rflags | |
207 # define context_err sc_err | |
208 # else | |
209 # define context_pc sc_eip | |
210 # define context_sp sc_esp | |
211 # define context_fp sc_ebp | |
212 # define context_eip sc_eip | |
213 # define context_esp sc_esp | |
214 # define context_eax sc_eax | |
215 # define context_ebx sc_ebx | |
216 # define context_ecx sc_ecx | |
217 # define context_edx sc_edx | |
218 # define context_ebp sc_ebp | |
219 # define context_esi sc_esi | |
220 # define context_edi sc_edi | |
221 # define context_eflags sc_eflags | |
222 # define context_trapno sc_trapno | |
223 # endif | |
224 #endif | |
225 | |
226 #ifdef __NetBSD__ | |
227 # define context_trapno uc_mcontext.__gregs[_REG_TRAPNO] | |
228 # ifdef AMD64 | |
229 # define __register_t __greg_t | |
230 # define context_pc uc_mcontext.__gregs[_REG_RIP] | |
231 # define context_sp uc_mcontext.__gregs[_REG_URSP] | |
232 # define context_fp uc_mcontext.__gregs[_REG_RBP] | |
233 # define context_rip uc_mcontext.__gregs[_REG_RIP] | |
234 # define context_rsp uc_mcontext.__gregs[_REG_URSP] | |
235 # define context_rax uc_mcontext.__gregs[_REG_RAX] | |
236 # define context_rbx uc_mcontext.__gregs[_REG_RBX] | |
237 # define context_rcx uc_mcontext.__gregs[_REG_RCX] | |
238 # define context_rdx uc_mcontext.__gregs[_REG_RDX] | |
239 # define context_rbp uc_mcontext.__gregs[_REG_RBP] | |
240 # define context_rsi uc_mcontext.__gregs[_REG_RSI] | |
241 # define context_rdi uc_mcontext.__gregs[_REG_RDI] | |
242 # define context_r8 uc_mcontext.__gregs[_REG_R8] | |
243 # define context_r9 uc_mcontext.__gregs[_REG_R9] | |
244 # define context_r10 uc_mcontext.__gregs[_REG_R10] | |
245 # define context_r11 uc_mcontext.__gregs[_REG_R11] | |
246 # define context_r12 uc_mcontext.__gregs[_REG_R12] | |
247 # define context_r13 uc_mcontext.__gregs[_REG_R13] | |
248 # define context_r14 uc_mcontext.__gregs[_REG_R14] | |
249 # define context_r15 uc_mcontext.__gregs[_REG_R15] | |
250 # define context_flags uc_mcontext.__gregs[_REG_RFL] | |
251 # define context_err uc_mcontext.__gregs[_REG_ERR] | |
252 # else | |
253 # define context_pc uc_mcontext.__gregs[_REG_EIP] | |
254 # define context_sp uc_mcontext.__gregs[_REG_UESP] | |
255 # define context_fp uc_mcontext.__gregs[_REG_EBP] | |
256 # define context_eip uc_mcontext.__gregs[_REG_EIP] | |
257 # define context_esp uc_mcontext.__gregs[_REG_UESP] | |
258 # define context_eax uc_mcontext.__gregs[_REG_EAX] | |
259 # define context_ebx uc_mcontext.__gregs[_REG_EBX] | |
260 # define context_ecx uc_mcontext.__gregs[_REG_ECX] | |
261 # define context_edx uc_mcontext.__gregs[_REG_EDX] | |
262 # define context_ebp uc_mcontext.__gregs[_REG_EBP] | |
263 # define context_esi uc_mcontext.__gregs[_REG_ESI] | |
264 # define context_edi uc_mcontext.__gregs[_REG_EDI] | |
265 # define context_eflags uc_mcontext.__gregs[_REG_EFL] | |
266 # define context_trapno uc_mcontext.__gregs[_REG_TRAPNO] | |
267 # endif | |
268 #endif | |
269 | |
270 address os::current_stack_pointer() { | |
4006 | 271 #if defined(__clang__) || defined(__llvm__) |
272 register void *esp; | |
273 __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp)); | |
274 return (address) esp; | |
275 #elif defined(SPARC_WORKS) | |
3960 | 276 register void *esp; |
277 __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp)); | |
278 return (address) ((char*)esp + sizeof(long)*2); | |
279 #else | |
280 register void *esp __asm__ (SPELL_REG_SP); | |
281 return (address) esp; | |
282 #endif | |
283 } | |
284 | |
285 char* os::non_memory_address_word() { | |
286 // Must never look like an address returned by reserve_memory, | |
287 // even in its subfields (as defined by the CPU immediate fields, | |
288 // if the CPU splits constants across multiple instructions). | |
289 | |
290 return (char*) -1; | |
291 } | |
292 | |
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293 void os::initialize_thread(Thread* thr) { |
3960 | 294 // Nothing to do. |
295 } | |
296 | |
297 address os::Bsd::ucontext_get_pc(ucontext_t * uc) { | |
298 return (address)uc->context_pc; | |
299 } | |
300 | |
301 intptr_t* os::Bsd::ucontext_get_sp(ucontext_t * uc) { | |
302 return (intptr_t*)uc->context_sp; | |
303 } | |
304 | |
305 intptr_t* os::Bsd::ucontext_get_fp(ucontext_t * uc) { | |
306 return (intptr_t*)uc->context_fp; | |
307 } | |
308 | |
309 // For Forte Analyzer AsyncGetCallTrace profiling support - thread | |
310 // is currently interrupted by SIGPROF. | |
311 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal | |
312 // frames. Currently we don't do that on Bsd, so it's the same as | |
313 // os::fetch_frame_from_context(). | |
314 ExtendedPC os::Bsd::fetch_frame_from_ucontext(Thread* thread, | |
315 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { | |
316 | |
317 assert(thread != NULL, "just checking"); | |
318 assert(ret_sp != NULL, "just checking"); | |
319 assert(ret_fp != NULL, "just checking"); | |
320 | |
321 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
322 } | |
323 | |
324 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
325 intptr_t** ret_sp, intptr_t** ret_fp) { | |
326 | |
327 ExtendedPC epc; | |
328 ucontext_t* uc = (ucontext_t*)ucVoid; | |
329 | |
330 if (uc != NULL) { | |
331 epc = ExtendedPC(os::Bsd::ucontext_get_pc(uc)); | |
332 if (ret_sp) *ret_sp = os::Bsd::ucontext_get_sp(uc); | |
333 if (ret_fp) *ret_fp = os::Bsd::ucontext_get_fp(uc); | |
334 } else { | |
335 // construct empty ExtendedPC for return value checking | |
336 epc = ExtendedPC(NULL); | |
337 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
338 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
339 } | |
340 | |
341 return epc; | |
342 } | |
343 | |
344 frame os::fetch_frame_from_context(void* ucVoid) { | |
345 intptr_t* sp; | |
346 intptr_t* fp; | |
347 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
348 return frame(sp, fp, epc.pc()); | |
349 } | |
350 | |
351 // By default, gcc always save frame pointer (%ebp/%rbp) on stack. It may get | |
352 // turned off by -fomit-frame-pointer, | |
353 frame os::get_sender_for_C_frame(frame* fr) { | |
354 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
355 } | |
356 | |
357 intptr_t* _get_previous_fp() { | |
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358 #if defined(SPARC_WORKS) || defined(__clang__) || defined(__llvm__) |
3960 | 359 register intptr_t **ebp; |
360 __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp)); | |
361 #else | |
362 register intptr_t **ebp __asm__ (SPELL_REG_FP); | |
363 #endif | |
364 return (intptr_t*) *ebp; // we want what it points to. | |
365 } | |
366 | |
367 | |
368 frame os::current_frame() { | |
369 intptr_t* fp = _get_previous_fp(); | |
370 frame myframe((intptr_t*)os::current_stack_pointer(), | |
371 (intptr_t*)fp, | |
372 CAST_FROM_FN_PTR(address, os::current_frame)); | |
373 if (os::is_first_C_frame(&myframe)) { | |
374 // stack is not walkable | |
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375 return frame(); |
3960 | 376 } else { |
377 return os::get_sender_for_C_frame(&myframe); | |
378 } | |
379 } | |
380 | |
381 // Utility functions | |
382 | |
383 // From IA32 System Programming Guide | |
384 enum { | |
385 trap_page_fault = 0xE | |
386 }; | |
387 | |
388 extern "C" JNIEXPORT int | |
389 JVM_handle_bsd_signal(int sig, | |
390 siginfo_t* info, | |
391 void* ucVoid, | |
392 int abort_if_unrecognized) { | |
393 ucontext_t* uc = (ucontext_t*) ucVoid; | |
394 | |
395 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
396 | |
11151 | 397 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
398 // (no destructors can be run) | |
399 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); | |
400 | |
3960 | 401 SignalHandlerMark shm(t); |
402 | |
403 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
404 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
405 // or have a SIGILL handler when detecting CPU type). When that happens, | |
406 // JVM_handle_bsd_signal() might be invoked with junk info/ucVoid. To | |
407 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
408 // that do not require siginfo/ucontext first. | |
409 | |
410 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
411 // allow chained handler to go first | |
412 if (os::Bsd::chained_handler(sig, info, ucVoid)) { | |
413 return true; | |
414 } else { | |
415 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
416 char buf[64]; | |
417 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
418 os::exception_name(sig, buf, sizeof(buf))); | |
419 } | |
420 return true; | |
421 } | |
422 } | |
423 | |
424 JavaThread* thread = NULL; | |
425 VMThread* vmthread = NULL; | |
426 if (os::Bsd::signal_handlers_are_installed) { | |
427 if (t != NULL ){ | |
428 if(t->is_Java_thread()) { | |
429 thread = (JavaThread*)t; | |
430 } | |
431 else if(t->is_VM_thread()){ | |
432 vmthread = (VMThread *)t; | |
433 } | |
434 } | |
435 } | |
436 /* | |
437 NOTE: does not seem to work on bsd. | |
438 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { | |
439 // can't decode this kind of signal | |
440 info = NULL; | |
441 } else { | |
442 assert(sig == info->si_signo, "bad siginfo"); | |
443 } | |
444 */ | |
445 // decide if this trap can be handled by a stub | |
446 address stub = NULL; | |
447 | |
448 address pc = NULL; | |
449 | |
450 //%note os_trap_1 | |
451 if (info != NULL && uc != NULL && thread != NULL) { | |
452 pc = (address) os::Bsd::ucontext_get_pc(uc); | |
453 | |
11127 | 454 if (StubRoutines::is_safefetch_fault(pc)) { |
455 uc->context_pc = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc)); | |
456 return 1; | |
3960 | 457 } |
458 | |
459 // Handle ALL stack overflow variations here | |
460 if (sig == SIGSEGV || sig == SIGBUS) { | |
461 address addr = (address) info->si_addr; | |
462 | |
463 // check if fault address is within thread stack | |
464 if (addr < thread->stack_base() && | |
465 addr >= thread->stack_base() - thread->stack_size()) { | |
466 // stack overflow | |
467 if (thread->in_stack_yellow_zone(addr)) { | |
468 thread->disable_stack_yellow_zone(); | |
469 if (thread->thread_state() == _thread_in_Java) { | |
470 // Throw a stack overflow exception. Guard pages will be reenabled | |
471 // while unwinding the stack. | |
472 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); | |
473 } else { | |
474 // Thread was in the vm or native code. Return and try to finish. | |
475 return 1; | |
476 } | |
477 } else if (thread->in_stack_red_zone(addr)) { | |
478 // Fatal red zone violation. Disable the guard pages and fall through | |
479 // to handle_unexpected_exception way down below. | |
480 thread->disable_stack_red_zone(); | |
481 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
482 } | |
483 } | |
484 } | |
485 | |
6184 | 486 // We test if stub is already set (by the stack overflow code |
487 // above) so it is not overwritten by the code that follows. This | |
488 // check is not required on other platforms, because on other | |
489 // platforms we check for SIGSEGV only or SIGBUS only, where here | |
490 // we have to check for both SIGSEGV and SIGBUS. | |
491 if (thread->thread_state() == _thread_in_Java && stub == NULL) { | |
3960 | 492 // Java thread running in Java code => find exception handler if any |
493 // a fault inside compiled code, the interpreter, or a stub | |
494 | |
495 if ((sig == SIGSEGV || sig == SIGBUS) && os::is_poll_address((address)info->si_addr)) { | |
496 stub = SharedRuntime::get_poll_stub(pc); | |
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497 #if defined(__APPLE__) |
3960 | 498 // 32-bit Darwin reports a SIGBUS for nearly all memory access exceptions. |
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499 // 64-bit Darwin may also use a SIGBUS (seen with compressed oops). |
3960 | 500 // Catching SIGBUS here prevents the implicit SIGBUS NULL check below from |
501 // being called, so only do so if the implicit NULL check is not necessary. | |
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502 } else if (sig == SIGBUS && MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { |
3960 | 503 #else |
504 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { | |
505 #endif | |
506 // BugId 4454115: A read from a MappedByteBuffer can fault | |
507 // here if the underlying file has been truncated. | |
508 // Do not crash the VM in such a case. | |
509 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
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510 nmethod* nm = (cb != NULL && cb->is_nmethod()) ? (nmethod*)cb : NULL; |
3960 | 511 if (nm != NULL && nm->has_unsafe_access()) { |
512 stub = StubRoutines::handler_for_unsafe_access(); | |
513 } | |
514 } | |
515 else | |
516 | |
517 #ifdef AMD64 | |
518 if (sig == SIGFPE && | |
519 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { | |
520 stub = | |
521 SharedRuntime:: | |
522 continuation_for_implicit_exception(thread, | |
523 pc, | |
524 SharedRuntime:: | |
525 IMPLICIT_DIVIDE_BY_ZERO); | |
526 #ifdef __APPLE__ | |
527 } else if (sig == SIGFPE && info->si_code == FPE_NOOP) { | |
528 int op = pc[0]; | |
529 | |
530 // Skip REX | |
531 if ((pc[0] & 0xf0) == 0x40) { | |
532 op = pc[1]; | |
533 } else { | |
534 op = pc[0]; | |
535 } | |
536 | |
537 // Check for IDIV | |
538 if (op == 0xF7) { | |
539 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime:: IMPLICIT_DIVIDE_BY_ZERO); | |
540 } else { | |
541 // TODO: handle more cases if we are using other x86 instructions | |
542 // that can generate SIGFPE signal. | |
543 tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); | |
544 fatal("please update this code."); | |
545 } | |
546 #endif /* __APPLE__ */ | |
547 | |
548 #else | |
549 if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { | |
550 // HACK: si_code does not work on bsd 2.2.12-20!!! | |
551 int op = pc[0]; | |
552 if (op == 0xDB) { | |
553 // FIST | |
554 // TODO: The encoding of D2I in i486.ad can cause an exception | |
555 // prior to the fist instruction if there was an invalid operation | |
556 // pending. We want to dismiss that exception. From the win_32 | |
557 // side it also seems that if it really was the fist causing | |
558 // the exception that we do the d2i by hand with different | |
559 // rounding. Seems kind of weird. | |
560 // NOTE: that we take the exception at the NEXT floating point instruction. | |
561 assert(pc[0] == 0xDB, "not a FIST opcode"); | |
562 assert(pc[1] == 0x14, "not a FIST opcode"); | |
563 assert(pc[2] == 0x24, "not a FIST opcode"); | |
564 return true; | |
565 } else if (op == 0xF7) { | |
566 // IDIV | |
567 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
568 } else { | |
569 // TODO: handle more cases if we are using other x86 instructions | |
570 // that can generate SIGFPE signal on bsd. | |
571 tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); | |
572 fatal("please update this code."); | |
573 } | |
574 #endif // AMD64 | |
575 } else if ((sig == SIGSEGV || sig == SIGBUS) && | |
576 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { | |
577 // Determination of interpreter/vtable stub/compiled code null exception | |
578 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); | |
579 } | |
580 } else if (thread->thread_state() == _thread_in_vm && | |
581 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ | |
582 thread->doing_unsafe_access()) { | |
583 stub = StubRoutines::handler_for_unsafe_access(); | |
584 } | |
585 | |
586 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
587 // and the heap gets shrunk before the field access. | |
588 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
589 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
590 if (addr != (address)-1) { | |
591 stub = addr; | |
592 } | |
593 } | |
594 | |
595 // Check to see if we caught the safepoint code in the | |
596 // process of write protecting the memory serialization page. | |
597 // It write enables the page immediately after protecting it | |
598 // so we can just return to retry the write. | |
599 if ((sig == SIGSEGV || sig == SIGBUS) && | |
600 os::is_memory_serialize_page(thread, (address) info->si_addr)) { | |
601 // Block current thread until the memory serialize page permission restored. | |
602 os::block_on_serialize_page_trap(); | |
603 return true; | |
604 } | |
605 } | |
606 | |
607 #ifndef AMD64 | |
608 // Execution protection violation | |
609 // | |
610 // This should be kept as the last step in the triage. We don't | |
611 // have a dedicated trap number for a no-execute fault, so be | |
612 // conservative and allow other handlers the first shot. | |
613 // | |
614 // Note: We don't test that info->si_code == SEGV_ACCERR here. | |
615 // this si_code is so generic that it is almost meaningless; and | |
616 // the si_code for this condition may change in the future. | |
617 // Furthermore, a false-positive should be harmless. | |
618 if (UnguardOnExecutionViolation > 0 && | |
619 (sig == SIGSEGV || sig == SIGBUS) && | |
620 uc->context_trapno == trap_page_fault) { | |
621 int page_size = os::vm_page_size(); | |
622 address addr = (address) info->si_addr; | |
623 address pc = os::Bsd::ucontext_get_pc(uc); | |
624 // Make sure the pc and the faulting address are sane. | |
625 // | |
626 // If an instruction spans a page boundary, and the page containing | |
627 // the beginning of the instruction is executable but the following | |
628 // page is not, the pc and the faulting address might be slightly | |
629 // different - we still want to unguard the 2nd page in this case. | |
630 // | |
631 // 15 bytes seems to be a (very) safe value for max instruction size. | |
632 bool pc_is_near_addr = | |
633 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
634 bool instr_spans_page_boundary = | |
635 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
636 (intptr_t) page_size) > 0); | |
637 | |
638 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
639 static volatile address last_addr = | |
640 (address) os::non_memory_address_word(); | |
641 | |
642 // In conservative mode, don't unguard unless the address is in the VM | |
643 if (addr != last_addr && | |
644 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
645 | |
646 // Set memory to RWX and retry | |
647 address page_start = | |
648 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
649 bool res = os::protect_memory((char*) page_start, page_size, | |
650 os::MEM_PROT_RWX); | |
651 | |
652 if (PrintMiscellaneous && Verbose) { | |
653 char buf[256]; | |
654 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
655 "at " INTPTR_FORMAT | |
656 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, | |
657 page_start, (res ? "success" : "failed"), errno); | |
658 tty->print_raw_cr(buf); | |
659 } | |
660 stub = pc; | |
661 | |
662 // Set last_addr so if we fault again at the same address, we don't end | |
663 // up in an endless loop. | |
664 // | |
665 // There are two potential complications here. Two threads trapping at | |
666 // the same address at the same time could cause one of the threads to | |
667 // think it already unguarded, and abort the VM. Likely very rare. | |
668 // | |
669 // The other race involves two threads alternately trapping at | |
670 // different addresses and failing to unguard the page, resulting in | |
671 // an endless loop. This condition is probably even more unlikely than | |
672 // the first. | |
673 // | |
674 // Although both cases could be avoided by using locks or thread local | |
675 // last_addr, these solutions are unnecessary complication: this | |
676 // handler is a best-effort safety net, not a complete solution. It is | |
677 // disabled by default and should only be used as a workaround in case | |
678 // we missed any no-execute-unsafe VM code. | |
679 | |
680 last_addr = addr; | |
681 } | |
682 } | |
683 } | |
684 #endif // !AMD64 | |
685 | |
686 if (stub != NULL) { | |
687 // save all thread context in case we need to restore it | |
688 if (thread != NULL) thread->set_saved_exception_pc(pc); | |
689 | |
690 uc->context_pc = (intptr_t)stub; | |
691 return true; | |
692 } | |
693 | |
694 // signal-chaining | |
695 if (os::Bsd::chained_handler(sig, info, ucVoid)) { | |
696 return true; | |
697 } | |
698 | |
699 if (!abort_if_unrecognized) { | |
700 // caller wants another chance, so give it to him | |
701 return false; | |
702 } | |
703 | |
704 if (pc == NULL && uc != NULL) { | |
705 pc = os::Bsd::ucontext_get_pc(uc); | |
706 } | |
707 | |
708 // unmask current signal | |
709 sigset_t newset; | |
710 sigemptyset(&newset); | |
711 sigaddset(&newset, sig); | |
712 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
713 | |
714 VMError err(t, sig, pc, info, ucVoid); | |
715 err.report_and_die(); | |
716 | |
717 ShouldNotReachHere(); | |
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718 return false; |
3960 | 719 } |
720 | |
721 // From solaris_i486.s ported to bsd_i486.s | |
722 extern "C" void fixcw(); | |
723 | |
724 void os::Bsd::init_thread_fpu_state(void) { | |
725 #ifndef AMD64 | |
726 // Set fpu to 53 bit precision. This happens too early to use a stub. | |
727 fixcw(); | |
728 #endif // !AMD64 | |
729 } | |
730 | |
731 | |
732 // Check that the bsd kernel version is 2.4 or higher since earlier | |
733 // versions do not support SSE without patches. | |
734 bool os::supports_sse() { | |
735 return true; | |
736 } | |
737 | |
738 bool os::is_allocatable(size_t bytes) { | |
739 #ifdef AMD64 | |
740 // unused on amd64? | |
741 return true; | |
742 #else | |
743 | |
744 if (bytes < 2 * G) { | |
745 return true; | |
746 } | |
747 | |
748 char* addr = reserve_memory(bytes, NULL); | |
749 | |
750 if (addr != NULL) { | |
751 release_memory(addr, bytes); | |
752 } | |
753 | |
754 return addr != NULL; | |
755 #endif // AMD64 | |
756 } | |
757 | |
758 //////////////////////////////////////////////////////////////////////////////// | |
759 // thread stack | |
760 | |
761 #ifdef AMD64 | |
762 size_t os::Bsd::min_stack_allowed = 64 * K; | |
763 | |
764 // amd64: pthread on amd64 is always in floating stack mode | |
765 bool os::Bsd::supports_variable_stack_size() { return true; } | |
766 #else | |
767 size_t os::Bsd::min_stack_allowed = (48 DEBUG_ONLY(+4))*K; | |
768 | |
769 #ifdef __GNUC__ | |
770 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;}) | |
771 #endif | |
772 | |
773 bool os::Bsd::supports_variable_stack_size() { return true; } | |
774 #endif // AMD64 | |
775 | |
776 // return default stack size for thr_type | |
777 size_t os::Bsd::default_stack_size(os::ThreadType thr_type) { | |
778 // default stack size (compiler thread needs larger stack) | |
779 #ifdef AMD64 | |
780 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
781 #else | |
782 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); | |
783 #endif // AMD64 | |
784 return s; | |
785 } | |
786 | |
787 size_t os::Bsd::default_guard_size(os::ThreadType thr_type) { | |
788 // Creating guard page is very expensive. Java thread has HotSpot | |
789 // guard page, only enable glibc guard page for non-Java threads. | |
790 return (thr_type == java_thread ? 0 : page_size()); | |
791 } | |
792 | |
793 // Java thread: | |
794 // | |
795 // Low memory addresses | |
796 // +------------------------+ | |
797 // | |\ JavaThread created by VM does not have glibc | |
798 // | glibc guard page | - guard, attached Java thread usually has | |
799 // | |/ 1 page glibc guard. | |
800 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() | |
801 // | |\ | |
802 // | HotSpot Guard Pages | - red and yellow pages | |
803 // | |/ | |
804 // +------------------------+ JavaThread::stack_yellow_zone_base() | |
805 // | |\ | |
806 // | Normal Stack | - | |
807 // | |/ | |
808 // P2 +------------------------+ Thread::stack_base() | |
809 // | |
810 // Non-Java thread: | |
811 // | |
812 // Low memory addresses | |
813 // +------------------------+ | |
814 // | |\ | |
815 // | glibc guard page | - usually 1 page | |
816 // | |/ | |
817 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() | |
818 // | |\ | |
819 // | Normal Stack | - | |
820 // | |/ | |
821 // P2 +------------------------+ Thread::stack_base() | |
822 // | |
823 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from | |
824 // pthread_attr_getstack() | |
825 | |
826 static void current_stack_region(address * bottom, size_t * size) { | |
827 #ifdef __APPLE__ | |
828 pthread_t self = pthread_self(); | |
829 void *stacktop = pthread_get_stackaddr_np(self); | |
830 *size = pthread_get_stacksize_np(self); | |
831 *bottom = (address) stacktop - *size; | |
832 #elif defined(__OpenBSD__) | |
833 stack_t ss; | |
834 int rslt = pthread_stackseg_np(pthread_self(), &ss); | |
835 | |
836 if (rslt != 0) | |
837 fatal(err_msg("pthread_stackseg_np failed with err = %d", rslt)); | |
838 | |
839 *bottom = (address)((char *)ss.ss_sp - ss.ss_size); | |
840 *size = ss.ss_size; | |
6918 | 841 #else |
3960 | 842 pthread_attr_t attr; |
843 | |
844 int rslt = pthread_attr_init(&attr); | |
845 | |
846 // JVM needs to know exact stack location, abort if it fails | |
847 if (rslt != 0) | |
848 fatal(err_msg("pthread_attr_init failed with err = %d", rslt)); | |
849 | |
850 rslt = pthread_attr_get_np(pthread_self(), &attr); | |
851 | |
852 if (rslt != 0) | |
853 fatal(err_msg("pthread_attr_get_np failed with err = %d", rslt)); | |
854 | |
855 if (pthread_attr_getstackaddr(&attr, (void **)bottom) != 0 || | |
856 pthread_attr_getstacksize(&attr, size) != 0) { | |
857 fatal("Can not locate current stack attributes!"); | |
858 } | |
859 | |
860 pthread_attr_destroy(&attr); | |
861 #endif | |
862 assert(os::current_stack_pointer() >= *bottom && | |
863 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
864 } | |
865 | |
866 address os::current_stack_base() { | |
867 address bottom; | |
868 size_t size; | |
869 current_stack_region(&bottom, &size); | |
870 return (bottom + size); | |
871 } | |
872 | |
873 size_t os::current_stack_size() { | |
874 // stack size includes normal stack and HotSpot guard pages | |
875 address bottom; | |
876 size_t size; | |
877 current_stack_region(&bottom, &size); | |
878 return size; | |
879 } | |
880 | |
881 ///////////////////////////////////////////////////////////////////////////// | |
882 // helper functions for fatal error handler | |
883 | |
884 void os::print_context(outputStream *st, void *context) { | |
885 if (context == NULL) return; | |
886 | |
887 ucontext_t *uc = (ucontext_t*)context; | |
888 st->print_cr("Registers:"); | |
889 #ifdef AMD64 | |
890 st->print( "RAX=" INTPTR_FORMAT, uc->context_rax); | |
891 st->print(", RBX=" INTPTR_FORMAT, uc->context_rbx); | |
892 st->print(", RCX=" INTPTR_FORMAT, uc->context_rcx); | |
893 st->print(", RDX=" INTPTR_FORMAT, uc->context_rdx); | |
894 st->cr(); | |
895 st->print( "RSP=" INTPTR_FORMAT, uc->context_rsp); | |
896 st->print(", RBP=" INTPTR_FORMAT, uc->context_rbp); | |
897 st->print(", RSI=" INTPTR_FORMAT, uc->context_rsi); | |
898 st->print(", RDI=" INTPTR_FORMAT, uc->context_rdi); | |
899 st->cr(); | |
900 st->print( "R8 =" INTPTR_FORMAT, uc->context_r8); | |
901 st->print(", R9 =" INTPTR_FORMAT, uc->context_r9); | |
902 st->print(", R10=" INTPTR_FORMAT, uc->context_r10); | |
903 st->print(", R11=" INTPTR_FORMAT, uc->context_r11); | |
904 st->cr(); | |
905 st->print( "R12=" INTPTR_FORMAT, uc->context_r12); | |
906 st->print(", R13=" INTPTR_FORMAT, uc->context_r13); | |
907 st->print(", R14=" INTPTR_FORMAT, uc->context_r14); | |
908 st->print(", R15=" INTPTR_FORMAT, uc->context_r15); | |
909 st->cr(); | |
910 st->print( "RIP=" INTPTR_FORMAT, uc->context_rip); | |
911 st->print(", EFLAGS=" INTPTR_FORMAT, uc->context_flags); | |
912 st->print(", ERR=" INTPTR_FORMAT, uc->context_err); | |
913 st->cr(); | |
914 st->print(" TRAPNO=" INTPTR_FORMAT, uc->context_trapno); | |
915 #else | |
916 st->print( "EAX=" INTPTR_FORMAT, uc->context_eax); | |
917 st->print(", EBX=" INTPTR_FORMAT, uc->context_ebx); | |
918 st->print(", ECX=" INTPTR_FORMAT, uc->context_ecx); | |
919 st->print(", EDX=" INTPTR_FORMAT, uc->context_edx); | |
920 st->cr(); | |
921 st->print( "ESP=" INTPTR_FORMAT, uc->context_esp); | |
922 st->print(", EBP=" INTPTR_FORMAT, uc->context_ebp); | |
923 st->print(", ESI=" INTPTR_FORMAT, uc->context_esi); | |
924 st->print(", EDI=" INTPTR_FORMAT, uc->context_edi); | |
925 st->cr(); | |
926 st->print( "EIP=" INTPTR_FORMAT, uc->context_eip); | |
927 st->print(", EFLAGS=" INTPTR_FORMAT, uc->context_eflags); | |
928 #endif // AMD64 | |
929 st->cr(); | |
930 st->cr(); | |
931 | |
932 intptr_t *sp = (intptr_t *)os::Bsd::ucontext_get_sp(uc); | |
933 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
934 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); | |
935 st->cr(); | |
936 | |
937 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
938 // point to garbage if entry point in an nmethod is corrupted. Leave | |
939 // this at the end, and hope for the best. | |
940 address pc = os::Bsd::ucontext_get_pc(uc); | |
941 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
942 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); | |
943 } | |
944 | |
945 void os::print_register_info(outputStream *st, void *context) { | |
946 if (context == NULL) return; | |
947 | |
948 ucontext_t *uc = (ucontext_t*)context; | |
949 | |
950 st->print_cr("Register to memory mapping:"); | |
951 st->cr(); | |
952 | |
953 // this is horrendously verbose but the layout of the registers in the | |
954 // context does not match how we defined our abstract Register set, so | |
955 // we can't just iterate through the gregs area | |
956 | |
957 // this is only for the "general purpose" registers | |
958 | |
959 #ifdef AMD64 | |
960 st->print("RAX="); print_location(st, uc->context_rax); | |
961 st->print("RBX="); print_location(st, uc->context_rbx); | |
962 st->print("RCX="); print_location(st, uc->context_rcx); | |
963 st->print("RDX="); print_location(st, uc->context_rdx); | |
964 st->print("RSP="); print_location(st, uc->context_rsp); | |
965 st->print("RBP="); print_location(st, uc->context_rbp); | |
966 st->print("RSI="); print_location(st, uc->context_rsi); | |
967 st->print("RDI="); print_location(st, uc->context_rdi); | |
968 st->print("R8 ="); print_location(st, uc->context_r8); | |
969 st->print("R9 ="); print_location(st, uc->context_r9); | |
970 st->print("R10="); print_location(st, uc->context_r10); | |
971 st->print("R11="); print_location(st, uc->context_r11); | |
972 st->print("R12="); print_location(st, uc->context_r12); | |
973 st->print("R13="); print_location(st, uc->context_r13); | |
974 st->print("R14="); print_location(st, uc->context_r14); | |
975 st->print("R15="); print_location(st, uc->context_r15); | |
976 #else | |
977 st->print("EAX="); print_location(st, uc->context_eax); | |
978 st->print("EBX="); print_location(st, uc->context_ebx); | |
979 st->print("ECX="); print_location(st, uc->context_ecx); | |
980 st->print("EDX="); print_location(st, uc->context_edx); | |
981 st->print("ESP="); print_location(st, uc->context_esp); | |
982 st->print("EBP="); print_location(st, uc->context_ebp); | |
983 st->print("ESI="); print_location(st, uc->context_esi); | |
984 st->print("EDI="); print_location(st, uc->context_edi); | |
985 #endif // AMD64 | |
986 | |
987 st->cr(); | |
988 } | |
989 | |
990 void os::setup_fpu() { | |
991 #ifndef AMD64 | |
992 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); | |
993 __asm__ volatile ( "fldcw (%0)" : | |
994 : "r" (fpu_cntrl) : "memory"); | |
995 #endif // !AMD64 | |
996 } | |
5903
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997 |
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998 #ifndef PRODUCT |
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999 void os::verify_stack_alignment() { |
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1000 } |
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1001 #endif |