Mercurial > hg > truffle
annotate src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp @ 999:708275a44e4a
Merge
author | tonyp |
---|---|
date | Sat, 03 Oct 2009 10:53:08 -0400 |
parents | d0994e5bebce |
children | 3f5b7efb9642 |
rev | line source |
---|---|
0 | 1 /* |
585 | 2 * Copyright 1999-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // do not include precompiled header file | |
26 # include "incls/_os_solaris_x86.cpp.incl" | |
27 | |
28 // put OS-includes here | |
29 # include <sys/types.h> | |
30 # include <sys/mman.h> | |
31 # include <pthread.h> | |
32 # include <signal.h> | |
33 # include <setjmp.h> | |
34 # include <errno.h> | |
35 # include <dlfcn.h> | |
36 # include <stdio.h> | |
37 # include <unistd.h> | |
38 # include <sys/resource.h> | |
39 # include <thread.h> | |
40 # include <sys/stat.h> | |
41 # include <sys/time.h> | |
42 # include <sys/filio.h> | |
43 # include <sys/utsname.h> | |
44 # include <sys/systeminfo.h> | |
45 # include <sys/socket.h> | |
46 # include <sys/trap.h> | |
47 # include <sys/lwp.h> | |
48 # include <pwd.h> | |
49 # include <poll.h> | |
50 # include <sys/lwp.h> | |
51 # include <procfs.h> // see comment in <sys/procfs.h> | |
52 | |
53 #ifndef AMD64 | |
54 // QQQ seems useless at this point | |
55 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later | |
56 #endif // AMD64 | |
57 # include <sys/procfs.h> // see comment in <sys/procfs.h> | |
58 | |
59 | |
60 #define MAX_PATH (2 * K) | |
61 | |
62 // Minimum stack size for the VM. It's easier to document a constant value | |
63 // but it's different for x86 and sparc because the page sizes are different. | |
64 #ifdef AMD64 | |
65 size_t os::Solaris::min_stack_allowed = 224*K; | |
66 #define REG_SP REG_RSP | |
67 #define REG_PC REG_RIP | |
68 #define REG_FP REG_RBP | |
69 #else | |
70 size_t os::Solaris::min_stack_allowed = 64*K; | |
71 #define REG_SP UESP | |
72 #define REG_PC EIP | |
73 #define REG_FP EBP | |
74 // 4900493 counter to prevent runaway LDTR refresh attempt | |
75 | |
76 static volatile int ldtr_refresh = 0; | |
77 // the libthread instruction that faults because of the stale LDTR | |
78 | |
79 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs | |
80 }; | |
81 #endif // AMD64 | |
82 | |
83 char* os::non_memory_address_word() { | |
84 // Must never look like an address returned by reserve_memory, | |
85 // even in its subfields (as defined by the CPU immediate fields, | |
86 // if the CPU splits constants across multiple instructions). | |
87 return (char*) -1; | |
88 } | |
89 | |
90 // | |
91 // Validate a ucontext retrieved from walking a uc_link of a ucontext. | |
92 // There are issues with libthread giving out uc_links for different threads | |
93 // on the same uc_link chain and bad or circular links. | |
94 // | |
95 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) { | |
96 if (valid >= suspect || | |
97 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || | |
98 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || | |
99 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { | |
100 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) | |
101 return false; | |
102 } | |
103 | |
104 if (thread->is_Java_thread()) { | |
105 if (!valid_stack_address(thread, (address)suspect)) { | |
106 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) | |
107 return false; | |
108 } | |
109 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) { | |
110 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) | |
111 return false; | |
112 } | |
113 } | |
114 return true; | |
115 } | |
116 | |
117 // We will only follow one level of uc_link since there are libthread | |
118 // issues with ucontext linking and it is better to be safe and just | |
119 // let caller retry later. | |
120 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, | |
121 ucontext_t *uc) { | |
122 | |
123 ucontext_t *retuc = NULL; | |
124 | |
125 if (uc != NULL) { | |
126 if (uc->uc_link == NULL) { | |
127 // cannot validate without uc_link so accept current ucontext | |
128 retuc = uc; | |
129 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { | |
130 // first ucontext is valid so try the next one | |
131 uc = uc->uc_link; | |
132 if (uc->uc_link == NULL) { | |
133 // cannot validate without uc_link so accept current ucontext | |
134 retuc = uc; | |
135 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { | |
136 // the ucontext one level down is also valid so return it | |
137 retuc = uc; | |
138 } | |
139 } | |
140 } | |
141 return retuc; | |
142 } | |
143 | |
144 // Assumes ucontext is valid | |
145 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) { | |
146 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); | |
147 } | |
148 | |
149 // Assumes ucontext is valid | |
150 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { | |
151 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; | |
152 } | |
153 | |
154 // Assumes ucontext is valid | |
155 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { | |
156 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; | |
157 } | |
158 | |
159 // For Forte Analyzer AsyncGetCallTrace profiling support - thread | |
160 // is currently interrupted by SIGPROF. | |
161 // | |
162 // The difference between this and os::fetch_frame_from_context() is that | |
163 // here we try to skip nested signal frames. | |
164 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, | |
165 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { | |
166 | |
167 assert(thread != NULL, "just checking"); | |
168 assert(ret_sp != NULL, "just checking"); | |
169 assert(ret_fp != NULL, "just checking"); | |
170 | |
171 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); | |
172 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); | |
173 } | |
174 | |
175 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
176 intptr_t** ret_sp, intptr_t** ret_fp) { | |
177 | |
178 ExtendedPC epc; | |
179 ucontext_t *uc = (ucontext_t*)ucVoid; | |
180 | |
181 if (uc != NULL) { | |
182 epc = os::Solaris::ucontext_get_ExtendedPC(uc); | |
183 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); | |
184 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); | |
185 } else { | |
186 // construct empty ExtendedPC for return value checking | |
187 epc = ExtendedPC(NULL); | |
188 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
189 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
190 } | |
191 | |
192 return epc; | |
193 } | |
194 | |
195 frame os::fetch_frame_from_context(void* ucVoid) { | |
196 intptr_t* sp; | |
197 intptr_t* fp; | |
198 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
199 return frame(sp, fp, epc.pc()); | |
200 } | |
201 | |
202 frame os::get_sender_for_C_frame(frame* fr) { | |
203 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
204 } | |
205 | |
472
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206 extern "C" intptr_t *_get_current_fp(); // in .il file |
0 | 207 |
208 frame os::current_frame() { | |
472
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209 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp |
0 | 210 frame myframe((intptr_t*)os::current_stack_pointer(), |
211 (intptr_t*)fp, | |
212 CAST_FROM_FN_PTR(address, os::current_frame)); | |
213 if (os::is_first_C_frame(&myframe)) { | |
214 // stack is not walkable | |
107
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215 frame ret; // This will be a null useless frame |
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216 return ret; |
0 | 217 } else { |
218 return os::get_sender_for_C_frame(&myframe); | |
219 } | |
220 } | |
221 | |
222 // This is a simple callback that just fetches a PC for an interrupted thread. | |
223 // The thread need not be suspended and the fetched PC is just a hint. | |
224 // This one is currently used for profiling the VMThread ONLY! | |
225 | |
226 // Must be synchronous | |
227 void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) { | |
228 Thread* thread = args->thread(); | |
229 ucontext_t* uc = args->ucontext(); | |
230 intptr_t* sp; | |
231 | |
232 assert(ProfileVM && thread->is_VM_thread(), "just checking"); | |
233 | |
234 ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]); | |
235 _addr = new_addr; | |
236 } | |
237 | |
238 static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) { | |
239 char lwpstatusfile[PROCFILE_LENGTH]; | |
240 int lwpfd, err; | |
241 | |
242 if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs)) | |
243 return (err); | |
244 if (*flags == TRS_LWPID) { | |
245 sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(), | |
246 *lwp); | |
247 if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) { | |
248 perror("thr_mutator_status: open lwpstatus"); | |
249 return (EINVAL); | |
250 } | |
251 if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) != | |
252 sizeof (lwpstatus_t)) { | |
253 perror("thr_mutator_status: read lwpstatus"); | |
254 (void) close(lwpfd); | |
255 return (EINVAL); | |
256 } | |
257 (void) close(lwpfd); | |
258 } | |
259 return (0); | |
260 } | |
261 | |
262 #ifndef AMD64 | |
263 | |
264 // Detecting SSE support by OS | |
265 // From solaris_i486.s | |
266 extern "C" bool sse_check(); | |
267 extern "C" bool sse_unavailable(); | |
268 | |
269 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; | |
270 static int sse_status = SSE_UNKNOWN; | |
271 | |
272 | |
273 static void check_for_sse_support() { | |
274 if (!VM_Version::supports_sse()) { | |
275 sse_status = SSE_NOT_SUPPORTED; | |
276 return; | |
277 } | |
278 // looking for _sse_hw in libc.so, if it does not exist or | |
279 // the value (int) is 0, OS has no support for SSE | |
280 int *sse_hwp; | |
281 void *h; | |
282 | |
283 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { | |
284 //open failed, presume no support for SSE | |
285 sse_status = SSE_NOT_SUPPORTED; | |
286 return; | |
287 } | |
288 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { | |
289 sse_status = SSE_NOT_SUPPORTED; | |
290 } else if (*sse_hwp == 0) { | |
291 sse_status = SSE_NOT_SUPPORTED; | |
292 } | |
293 dlclose(h); | |
294 | |
295 if (sse_status == SSE_UNKNOWN) { | |
296 bool (*try_sse)() = (bool (*)())sse_check; | |
297 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; | |
298 } | |
299 | |
300 } | |
301 | |
585 | 302 #endif // AMD64 |
303 | |
0 | 304 bool os::supports_sse() { |
585 | 305 #ifdef AMD64 |
306 return true; | |
307 #else | |
0 | 308 if (sse_status == SSE_UNKNOWN) |
309 check_for_sse_support(); | |
310 return sse_status == SSE_SUPPORTED; | |
585 | 311 #endif // AMD64 |
0 | 312 } |
313 | |
314 bool os::is_allocatable(size_t bytes) { | |
315 #ifdef AMD64 | |
316 return true; | |
317 #else | |
318 | |
319 if (bytes < 2 * G) { | |
320 return true; | |
321 } | |
322 | |
323 char* addr = reserve_memory(bytes, NULL); | |
324 | |
325 if (addr != NULL) { | |
326 release_memory(addr, bytes); | |
327 } | |
328 | |
329 return addr != NULL; | |
330 #endif // AMD64 | |
331 | |
332 } | |
333 | |
334 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); | |
335 | |
336 extern "C" void Fetch32PFI () ; | |
337 extern "C" void Fetch32Resume () ; | |
338 #ifdef AMD64 | |
339 extern "C" void FetchNPFI () ; | |
340 extern "C" void FetchNResume () ; | |
341 #endif // AMD64 | |
342 | |
343 int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) { | |
344 ucontext_t* uc = (ucontext_t*) ucVoid; | |
345 | |
346 #ifndef AMD64 | |
347 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { | |
348 // the SSE instruction faulted. supports_sse() need return false. | |
349 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; | |
350 return true; | |
351 } | |
352 #endif // !AMD64 | |
353 | |
354 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady | |
355 | |
356 SignalHandlerMark shm(t); | |
357 | |
358 if(sig == SIGPIPE || sig == SIGXFSZ) { | |
359 if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
360 return true; | |
361 } else { | |
362 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
363 char buf[64]; | |
364 warning("Ignoring %s - see 4229104 or 6499219", | |
365 os::exception_name(sig, buf, sizeof(buf))); | |
366 | |
367 } | |
368 return true; | |
369 } | |
370 } | |
371 | |
372 JavaThread* thread = NULL; | |
373 VMThread* vmthread = NULL; | |
374 | |
375 if (os::Solaris::signal_handlers_are_installed) { | |
376 if (t != NULL ){ | |
377 if(t->is_Java_thread()) { | |
378 thread = (JavaThread*)t; | |
379 } | |
380 else if(t->is_VM_thread()){ | |
381 vmthread = (VMThread *)t; | |
382 } | |
383 } | |
384 } | |
385 | |
386 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); | |
387 | |
388 if (sig == os::Solaris::SIGasync()) { | |
389 if(thread){ | |
390 OSThread::InterruptArguments args(thread, uc); | |
391 thread->osthread()->do_interrupt_callbacks_at_interrupt(&args); | |
392 return true; | |
393 } | |
394 else if(vmthread){ | |
395 OSThread::InterruptArguments args(vmthread, uc); | |
396 vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args); | |
397 return true; | |
398 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
399 return true; | |
400 } else { | |
401 // If os::Solaris::SIGasync not chained, and this is a non-vm and | |
402 // non-java thread | |
403 return true; | |
404 } | |
405 } | |
406 | |
407 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { | |
408 // can't decode this kind of signal | |
409 info = NULL; | |
410 } else { | |
411 assert(sig == info->si_signo, "bad siginfo"); | |
412 } | |
413 | |
414 // decide if this trap can be handled by a stub | |
415 address stub = NULL; | |
416 | |
417 address pc = NULL; | |
418 | |
419 //%note os_trap_1 | |
420 if (info != NULL && uc != NULL && thread != NULL) { | |
421 // factor me: getPCfromContext | |
422 pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
423 | |
424 // SafeFetch32() support | |
425 if (pc == (address) Fetch32PFI) { | |
426 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; | |
427 return true ; | |
428 } | |
429 #ifdef AMD64 | |
430 if (pc == (address) FetchNPFI) { | |
431 uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ; | |
432 return true ; | |
433 } | |
434 #endif // AMD64 | |
435 | |
436 // Handle ALL stack overflow variations here | |
437 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { | |
438 address addr = (address) info->si_addr; | |
439 if (thread->in_stack_yellow_zone(addr)) { | |
440 thread->disable_stack_yellow_zone(); | |
441 if (thread->thread_state() == _thread_in_Java) { | |
442 // Throw a stack overflow exception. Guard pages will be reenabled | |
443 // while unwinding the stack. | |
444 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); | |
445 } else { | |
446 // Thread was in the vm or native code. Return and try to finish. | |
447 return true; | |
448 } | |
449 } else if (thread->in_stack_red_zone(addr)) { | |
450 // Fatal red zone violation. Disable the guard pages and fall through | |
451 // to handle_unexpected_exception way down below. | |
452 thread->disable_stack_red_zone(); | |
453 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
454 } | |
455 } | |
456 | |
457 if (thread->thread_state() == _thread_in_vm) { | |
458 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { | |
459 stub = StubRoutines::handler_for_unsafe_access(); | |
460 } | |
461 } | |
462 | |
463 if (thread->thread_state() == _thread_in_Java) { | |
464 // Support Safepoint Polling | |
465 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { | |
466 stub = SharedRuntime::get_poll_stub(pc); | |
467 } | |
468 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { | |
469 // BugId 4454115: A read from a MappedByteBuffer can fault | |
470 // here if the underlying file has been truncated. | |
471 // Do not crash the VM in such a case. | |
472 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
473 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
474 if (nm != NULL && nm->has_unsafe_access()) { | |
475 stub = StubRoutines::handler_for_unsafe_access(); | |
476 } | |
477 } | |
478 else | |
479 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { | |
480 // integer divide by zero | |
481 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
482 } | |
483 #ifndef AMD64 | |
484 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { | |
485 // floating-point divide by zero | |
486 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
487 } | |
488 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { | |
489 // The encoding of D2I in i486.ad can cause an exception prior | |
490 // to the fist instruction if there was an invalid operation | |
491 // pending. We want to dismiss that exception. From the win_32 | |
492 // side it also seems that if it really was the fist causing | |
493 // the exception that we do the d2i by hand with different | |
494 // rounding. Seems kind of weird. QQQ TODO | |
495 // Note that we take the exception at the NEXT floating point instruction. | |
496 if (pc[0] == 0xDB) { | |
497 assert(pc[0] == 0xDB, "not a FIST opcode"); | |
498 assert(pc[1] == 0x14, "not a FIST opcode"); | |
499 assert(pc[2] == 0x24, "not a FIST opcode"); | |
500 return true; | |
501 } else { | |
502 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); | |
503 assert(pc[-2] == 0x14, "not an flt invalid opcode"); | |
504 assert(pc[-1] == 0x24, "not an flt invalid opcode"); | |
505 } | |
506 } | |
507 else if (sig == SIGFPE ) { | |
508 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); | |
509 } | |
510 #endif // !AMD64 | |
511 | |
512 // QQQ It doesn't seem that we need to do this on x86 because we should be able | |
513 // to return properly from the handler without this extra stuff on the back side. | |
514 | |
515 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { | |
516 // Determination of interpreter/vtable stub/compiled code null exception | |
517 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); | |
518 } | |
519 } | |
520 | |
521 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
522 // and the heap gets shrunk before the field access. | |
523 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
524 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
525 if (addr != (address)-1) { | |
526 stub = addr; | |
527 } | |
528 } | |
529 | |
530 // Check to see if we caught the safepoint code in the | |
531 // process of write protecting the memory serialization page. | |
532 // It write enables the page immediately after protecting it | |
533 // so we can just return to retry the write. | |
534 if ((sig == SIGSEGV) && | |
535 os::is_memory_serialize_page(thread, (address)info->si_addr)) { | |
536 // Block current thread until the memory serialize page permission restored. | |
537 os::block_on_serialize_page_trap(); | |
538 return true; | |
539 } | |
540 } | |
541 | |
542 // Execution protection violation | |
543 // | |
544 // Preventative code for future versions of Solaris which may | |
545 // enable execution protection when running the 32-bit VM on AMD64. | |
546 // | |
547 // This should be kept as the last step in the triage. We don't | |
548 // have a dedicated trap number for a no-execute fault, so be | |
549 // conservative and allow other handlers the first shot. | |
550 // | |
551 // Note: We don't test that info->si_code == SEGV_ACCERR here. | |
552 // this si_code is so generic that it is almost meaningless; and | |
553 // the si_code for this condition may change in the future. | |
554 // Furthermore, a false-positive should be harmless. | |
555 if (UnguardOnExecutionViolation > 0 && | |
556 (sig == SIGSEGV || sig == SIGBUS) && | |
557 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault | |
558 int page_size = os::vm_page_size(); | |
559 address addr = (address) info->si_addr; | |
560 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
561 // Make sure the pc and the faulting address are sane. | |
562 // | |
563 // If an instruction spans a page boundary, and the page containing | |
564 // the beginning of the instruction is executable but the following | |
565 // page is not, the pc and the faulting address might be slightly | |
566 // different - we still want to unguard the 2nd page in this case. | |
567 // | |
568 // 15 bytes seems to be a (very) safe value for max instruction size. | |
569 bool pc_is_near_addr = | |
570 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
571 bool instr_spans_page_boundary = | |
572 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
573 (intptr_t) page_size) > 0); | |
574 | |
575 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
576 static volatile address last_addr = | |
577 (address) os::non_memory_address_word(); | |
578 | |
579 // In conservative mode, don't unguard unless the address is in the VM | |
580 if (addr != last_addr && | |
581 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
582 | |
477
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583 // Make memory rwx and retry |
0 | 584 address page_start = |
585 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
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586 bool res = os::protect_memory((char*) page_start, page_size, |
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587 os::MEM_PROT_RWX); |
0 | 588 |
589 if (PrintMiscellaneous && Verbose) { | |
590 char buf[256]; | |
591 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
592 "at " INTPTR_FORMAT | |
593 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, | |
594 page_start, (res ? "success" : "failed"), errno); | |
595 tty->print_raw_cr(buf); | |
596 } | |
597 stub = pc; | |
598 | |
599 // Set last_addr so if we fault again at the same address, we don't end | |
600 // up in an endless loop. | |
601 // | |
602 // There are two potential complications here. Two threads trapping at | |
603 // the same address at the same time could cause one of the threads to | |
604 // think it already unguarded, and abort the VM. Likely very rare. | |
605 // | |
606 // The other race involves two threads alternately trapping at | |
607 // different addresses and failing to unguard the page, resulting in | |
608 // an endless loop. This condition is probably even more unlikely than | |
609 // the first. | |
610 // | |
611 // Although both cases could be avoided by using locks or thread local | |
612 // last_addr, these solutions are unnecessary complication: this | |
613 // handler is a best-effort safety net, not a complete solution. It is | |
614 // disabled by default and should only be used as a workaround in case | |
615 // we missed any no-execute-unsafe VM code. | |
616 | |
617 last_addr = addr; | |
618 } | |
619 } | |
620 } | |
621 | |
622 if (stub != NULL) { | |
623 // save all thread context in case we need to restore it | |
624 | |
625 if (thread != NULL) thread->set_saved_exception_pc(pc); | |
626 // 12/02/99: On Sparc it appears that the full context is also saved | |
627 // but as yet, no one looks at or restores that saved context | |
628 // factor me: setPC | |
629 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; | |
630 return true; | |
631 } | |
632 | |
633 // signal-chaining | |
634 if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
635 return true; | |
636 } | |
637 | |
638 #ifndef AMD64 | |
639 // Workaround (bug 4900493) for Solaris kernel bug 4966651. | |
640 // Handle an undefined selector caused by an attempt to assign | |
641 // fs in libthread getipriptr(). With the current libthread design every 512 | |
642 // thread creations the LDT for a private thread data structure is extended | |
643 // and thre is a hazard that and another thread attempting a thread creation | |
644 // will use a stale LDTR that doesn't reflect the structure's growth, | |
645 // causing a GP fault. | |
646 // Enforce the probable limit of passes through here to guard against an | |
647 // infinite loop if some other move to fs caused the GP fault. Note that | |
648 // this loop counter is ultimately a heuristic as it is possible for | |
649 // more than one thread to generate this fault at a time in an MP system. | |
650 // In the case of the loop count being exceeded or if the poll fails | |
651 // just fall through to a fatal error. | |
652 // If there is some other source of T_GPFLT traps and the text at EIP is | |
653 // unreadable this code will loop infinitely until the stack is exausted. | |
654 // The key to diagnosis in this case is to look for the bottom signal handler | |
655 // frame. | |
656 | |
657 if(! IgnoreLibthreadGPFault) { | |
658 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { | |
659 const unsigned char *p = | |
660 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; | |
661 | |
662 // Expected instruction? | |
663 | |
664 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { | |
665 | |
666 Atomic::inc(&ldtr_refresh); | |
667 | |
668 // Infinite loop? | |
669 | |
670 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { | |
671 | |
672 // No, force scheduling to get a fresh view of the LDTR | |
673 | |
674 if(poll(NULL, 0, 10) == 0) { | |
675 | |
676 // Retry the move | |
677 | |
678 return false; | |
679 } | |
680 } | |
681 } | |
682 } | |
683 } | |
684 #endif // !AMD64 | |
685 | |
686 if (!abort_if_unrecognized) { | |
687 // caller wants another chance, so give it to him | |
688 return false; | |
689 } | |
690 | |
691 if (!os::Solaris::libjsig_is_loaded) { | |
692 struct sigaction oldAct; | |
693 sigaction(sig, (struct sigaction *)0, &oldAct); | |
694 if (oldAct.sa_sigaction != signalHandler) { | |
695 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
696 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
605 | 697 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); |
0 | 698 } |
699 } | |
700 | |
701 if (pc == NULL && uc != NULL) { | |
702 pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
703 } | |
704 | |
705 // unmask current signal | |
706 sigset_t newset; | |
707 sigemptyset(&newset); | |
708 sigaddset(&newset, sig); | |
709 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
710 | |
711 VMError err(t, sig, pc, info, ucVoid); | |
712 err.report_and_die(); | |
713 | |
714 ShouldNotReachHere(); | |
715 } | |
716 | |
717 void os::print_context(outputStream *st, void *context) { | |
718 if (context == NULL) return; | |
719 | |
720 ucontext_t *uc = (ucontext_t*)context; | |
721 st->print_cr("Registers:"); | |
722 #ifdef AMD64 | |
723 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); | |
724 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); | |
725 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); | |
726 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); | |
727 st->cr(); | |
728 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); | |
729 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); | |
730 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); | |
731 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); | |
732 st->cr(); | |
733 st->print(", R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); | |
734 st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); | |
735 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); | |
736 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); | |
737 st->print(", R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); | |
738 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); | |
739 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); | |
740 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); | |
741 st->cr(); | |
742 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); | |
743 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); | |
744 #else | |
745 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); | |
746 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); | |
747 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); | |
748 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); | |
749 st->cr(); | |
750 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); | |
751 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); | |
752 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); | |
753 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); | |
754 st->cr(); | |
755 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); | |
756 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); | |
757 #endif // AMD64 | |
758 st->cr(); | |
759 st->cr(); | |
760 | |
761 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); | |
762 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
763 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); | |
764 st->cr(); | |
765 | |
766 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
767 // point to garbage if entry point in an nmethod is corrupted. Leave | |
768 // this at the end, and hope for the best. | |
769 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); | |
770 address pc = epc.pc(); | |
771 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
772 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); | |
773 } | |
774 | |
775 #ifdef AMD64 | |
776 void os::Solaris::init_thread_fpu_state(void) { | |
777 // Nothing to do | |
778 } | |
779 #else | |
780 // From solaris_i486.s | |
781 extern "C" void fixcw(); | |
782 | |
783 void os::Solaris::init_thread_fpu_state(void) { | |
784 // Set fpu to 53 bit precision. This happens too early to use a stub. | |
785 fixcw(); | |
786 } | |
787 | |
788 // These routines are the initial value of atomic_xchg_entry(), | |
789 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() | |
790 // until initialization is complete. | |
791 // TODO - replace with .il implementation when compiler supports it. | |
792 | |
793 typedef jint xchg_func_t (jint, volatile jint*); | |
794 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); | |
795 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); | |
796 typedef jint add_func_t (jint, volatile jint*); | |
797 | |
798 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { | |
799 // try to use the stub: | |
800 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); | |
801 | |
802 if (func != NULL) { | |
803 os::atomic_xchg_func = func; | |
804 return (*func)(exchange_value, dest); | |
805 } | |
806 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
807 | |
808 jint old_value = *dest; | |
809 *dest = exchange_value; | |
810 return old_value; | |
811 } | |
812 | |
813 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { | |
814 // try to use the stub: | |
815 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); | |
816 | |
817 if (func != NULL) { | |
818 os::atomic_cmpxchg_func = func; | |
819 return (*func)(exchange_value, dest, compare_value); | |
820 } | |
821 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
822 | |
823 jint old_value = *dest; | |
824 if (old_value == compare_value) | |
825 *dest = exchange_value; | |
826 return old_value; | |
827 } | |
828 | |
829 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { | |
830 // try to use the stub: | |
831 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); | |
832 | |
833 if (func != NULL) { | |
834 os::atomic_cmpxchg_long_func = func; | |
835 return (*func)(exchange_value, dest, compare_value); | |
836 } | |
837 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
838 | |
839 jlong old_value = *dest; | |
840 if (old_value == compare_value) | |
841 *dest = exchange_value; | |
842 return old_value; | |
843 } | |
844 | |
845 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { | |
846 // try to use the stub: | |
847 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); | |
848 | |
849 if (func != NULL) { | |
850 os::atomic_add_func = func; | |
851 return (*func)(add_value, dest); | |
852 } | |
853 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
854 | |
855 return (*dest) += add_value; | |
856 } | |
857 | |
858 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; | |
859 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; | |
860 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; | |
861 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; | |
862 | |
863 extern "C" _solaris_raw_setup_fpu(address ptr); | |
864 void os::setup_fpu() { | |
865 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); | |
866 _solaris_raw_setup_fpu(fpu_cntrl); | |
867 } | |
868 #endif // AMD64 |