Mercurial > hg > truffle
annotate src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp @ 14170:cdc20b409a9c
replaced == with .equals()
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 13 Mar 2014 13:49:03 +0100 |
parents | af21010d1062 |
children | 2c2a99f6cf83 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 // no precompiled headers |
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26 #include "asm/macroAssembler.hpp" |
1972 | 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_solaris.h" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "mutex_solaris.inline.hpp" | |
36 #include "os_share_solaris.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" |
1972 | 51 #include "runtime/timer.hpp" |
52 #include "utilities/events.hpp" | |
53 #include "utilities/vmError.hpp" | |
0 | 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 <setjmp.h> | |
61 # include <errno.h> | |
62 # include <dlfcn.h> | |
63 # include <stdio.h> | |
64 # include <unistd.h> | |
65 # include <sys/resource.h> | |
66 # include <thread.h> | |
67 # include <sys/stat.h> | |
68 # include <sys/time.h> | |
69 # include <sys/filio.h> | |
70 # include <sys/utsname.h> | |
71 # include <sys/systeminfo.h> | |
72 # include <sys/socket.h> | |
73 # include <sys/trap.h> | |
74 # include <sys/lwp.h> | |
75 # include <pwd.h> | |
76 # include <poll.h> | |
77 # include <sys/lwp.h> | |
78 # include <procfs.h> // see comment in <sys/procfs.h> | |
79 | |
80 #ifndef AMD64 | |
81 // QQQ seems useless at this point | |
82 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later | |
83 #endif // AMD64 | |
84 # include <sys/procfs.h> // see comment in <sys/procfs.h> | |
85 | |
86 | |
87 #define MAX_PATH (2 * K) | |
88 | |
89 // Minimum stack size for the VM. It's easier to document a constant value | |
90 // but it's different for x86 and sparc because the page sizes are different. | |
91 #ifdef AMD64 | |
92 size_t os::Solaris::min_stack_allowed = 224*K; | |
93 #define REG_SP REG_RSP | |
94 #define REG_PC REG_RIP | |
95 #define REG_FP REG_RBP | |
96 #else | |
97 size_t os::Solaris::min_stack_allowed = 64*K; | |
98 #define REG_SP UESP | |
99 #define REG_PC EIP | |
100 #define REG_FP EBP | |
101 // 4900493 counter to prevent runaway LDTR refresh attempt | |
102 | |
103 static volatile int ldtr_refresh = 0; | |
104 // the libthread instruction that faults because of the stale LDTR | |
105 | |
106 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs | |
107 }; | |
108 #endif // AMD64 | |
109 | |
110 char* os::non_memory_address_word() { | |
111 // Must never look like an address returned by reserve_memory, | |
112 // even in its subfields (as defined by the CPU immediate fields, | |
113 // if the CPU splits constants across multiple instructions). | |
114 return (char*) -1; | |
115 } | |
116 | |
117 // | |
118 // Validate a ucontext retrieved from walking a uc_link of a ucontext. | |
119 // There are issues with libthread giving out uc_links for different threads | |
120 // on the same uc_link chain and bad or circular links. | |
121 // | |
122 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) { | |
123 if (valid >= suspect || | |
124 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags || | |
125 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp || | |
126 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) { | |
127 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");) | |
128 return false; | |
129 } | |
130 | |
131 if (thread->is_Java_thread()) { | |
132 if (!valid_stack_address(thread, (address)suspect)) { | |
133 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");) | |
134 return false; | |
135 } | |
136 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) { | |
137 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");) | |
138 return false; | |
139 } | |
140 } | |
141 return true; | |
142 } | |
143 | |
144 // We will only follow one level of uc_link since there are libthread | |
145 // issues with ucontext linking and it is better to be safe and just | |
146 // let caller retry later. | |
147 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread, | |
148 ucontext_t *uc) { | |
149 | |
150 ucontext_t *retuc = NULL; | |
151 | |
152 if (uc != NULL) { | |
153 if (uc->uc_link == NULL) { | |
154 // cannot validate without uc_link so accept current ucontext | |
155 retuc = uc; | |
156 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { | |
157 // first ucontext is valid so try the next one | |
158 uc = uc->uc_link; | |
159 if (uc->uc_link == NULL) { | |
160 // cannot validate without uc_link so accept current ucontext | |
161 retuc = uc; | |
162 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) { | |
163 // the ucontext one level down is also valid so return it | |
164 retuc = uc; | |
165 } | |
166 } | |
167 } | |
168 return retuc; | |
169 } | |
170 | |
171 // Assumes ucontext is valid | |
172 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) { | |
173 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]); | |
174 } | |
175 | |
176 // Assumes ucontext is valid | |
177 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) { | |
178 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; | |
179 } | |
180 | |
181 // Assumes ucontext is valid | |
182 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) { | |
183 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; | |
184 } | |
185 | |
10405 | 186 address os::Solaris::ucontext_get_pc(ucontext_t *uc) { |
187 return (address) uc->uc_mcontext.gregs[REG_PC]; | |
188 } | |
189 | |
0 | 190 // For Forte Analyzer AsyncGetCallTrace profiling support - thread |
191 // is currently interrupted by SIGPROF. | |
192 // | |
193 // The difference between this and os::fetch_frame_from_context() is that | |
194 // here we try to skip nested signal frames. | |
195 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread, | |
196 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { | |
197 | |
198 assert(thread != NULL, "just checking"); | |
199 assert(ret_sp != NULL, "just checking"); | |
200 assert(ret_fp != NULL, "just checking"); | |
201 | |
202 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc); | |
203 return os::fetch_frame_from_context(luc, ret_sp, ret_fp); | |
204 } | |
205 | |
206 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
207 intptr_t** ret_sp, intptr_t** ret_fp) { | |
208 | |
209 ExtendedPC epc; | |
210 ucontext_t *uc = (ucontext_t*)ucVoid; | |
211 | |
212 if (uc != NULL) { | |
213 epc = os::Solaris::ucontext_get_ExtendedPC(uc); | |
214 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc); | |
215 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc); | |
216 } else { | |
217 // construct empty ExtendedPC for return value checking | |
218 epc = ExtendedPC(NULL); | |
219 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
220 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
221 } | |
222 | |
223 return epc; | |
224 } | |
225 | |
226 frame os::fetch_frame_from_context(void* ucVoid) { | |
227 intptr_t* sp; | |
228 intptr_t* fp; | |
229 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
230 return frame(sp, fp, epc.pc()); | |
231 } | |
232 | |
233 frame os::get_sender_for_C_frame(frame* fr) { | |
234 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
235 } | |
236 | |
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237 extern "C" intptr_t *_get_current_sp(); // in .il file |
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238 |
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239 address os::current_stack_pointer() { |
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240 return (address)_get_current_sp(); |
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241 } |
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242 |
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243 extern "C" intptr_t *_get_current_fp(); // in .il file |
0 | 244 |
245 frame os::current_frame() { | |
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246 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp |
0 | 247 frame myframe((intptr_t*)os::current_stack_pointer(), |
248 (intptr_t*)fp, | |
249 CAST_FROM_FN_PTR(address, os::current_frame)); | |
250 if (os::is_first_C_frame(&myframe)) { | |
251 // stack is not walkable | |
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252 frame ret; // This will be a null useless frame |
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253 return ret; |
0 | 254 } else { |
255 return os::get_sender_for_C_frame(&myframe); | |
256 } | |
257 } | |
258 | |
259 static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) { | |
260 char lwpstatusfile[PROCFILE_LENGTH]; | |
261 int lwpfd, err; | |
262 | |
263 if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs)) | |
264 return (err); | |
265 if (*flags == TRS_LWPID) { | |
266 sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(), | |
267 *lwp); | |
268 if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) { | |
269 perror("thr_mutator_status: open lwpstatus"); | |
270 return (EINVAL); | |
271 } | |
272 if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) != | |
273 sizeof (lwpstatus_t)) { | |
274 perror("thr_mutator_status: read lwpstatus"); | |
275 (void) close(lwpfd); | |
276 return (EINVAL); | |
277 } | |
278 (void) close(lwpfd); | |
279 } | |
280 return (0); | |
281 } | |
282 | |
283 #ifndef AMD64 | |
284 | |
285 // Detecting SSE support by OS | |
286 // From solaris_i486.s | |
287 extern "C" bool sse_check(); | |
288 extern "C" bool sse_unavailable(); | |
289 | |
290 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED}; | |
291 static int sse_status = SSE_UNKNOWN; | |
292 | |
293 | |
294 static void check_for_sse_support() { | |
295 if (!VM_Version::supports_sse()) { | |
296 sse_status = SSE_NOT_SUPPORTED; | |
297 return; | |
298 } | |
299 // looking for _sse_hw in libc.so, if it does not exist or | |
300 // the value (int) is 0, OS has no support for SSE | |
301 int *sse_hwp; | |
302 void *h; | |
303 | |
304 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) { | |
305 //open failed, presume no support for SSE | |
306 sse_status = SSE_NOT_SUPPORTED; | |
307 return; | |
308 } | |
309 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) { | |
310 sse_status = SSE_NOT_SUPPORTED; | |
311 } else if (*sse_hwp == 0) { | |
312 sse_status = SSE_NOT_SUPPORTED; | |
313 } | |
314 dlclose(h); | |
315 | |
316 if (sse_status == SSE_UNKNOWN) { | |
317 bool (*try_sse)() = (bool (*)())sse_check; | |
318 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED; | |
319 } | |
320 | |
321 } | |
322 | |
585 | 323 #endif // AMD64 |
324 | |
0 | 325 bool os::supports_sse() { |
585 | 326 #ifdef AMD64 |
327 return true; | |
328 #else | |
0 | 329 if (sse_status == SSE_UNKNOWN) |
330 check_for_sse_support(); | |
331 return sse_status == SSE_SUPPORTED; | |
585 | 332 #endif // AMD64 |
0 | 333 } |
334 | |
335 bool os::is_allocatable(size_t bytes) { | |
336 #ifdef AMD64 | |
337 return true; | |
338 #else | |
339 | |
340 if (bytes < 2 * G) { | |
341 return true; | |
342 } | |
343 | |
344 char* addr = reserve_memory(bytes, NULL); | |
345 | |
346 if (addr != NULL) { | |
347 release_memory(addr, bytes); | |
348 } | |
349 | |
350 return addr != NULL; | |
351 #endif // AMD64 | |
352 | |
353 } | |
354 | |
2191 | 355 extern "C" JNIEXPORT int |
356 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, | |
357 int abort_if_unrecognized) { | |
0 | 358 ucontext_t* uc = (ucontext_t*) ucVoid; |
359 | |
360 #ifndef AMD64 | |
361 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) { | |
362 // the SSE instruction faulted. supports_sse() need return false. | |
363 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable; | |
364 return true; | |
365 } | |
366 #endif // !AMD64 | |
367 | |
368 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady | |
369 | |
11151 | 370 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
371 // (no destructors can be run) | |
372 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); | |
373 | |
0 | 374 SignalHandlerMark shm(t); |
375 | |
376 if(sig == SIGPIPE || sig == SIGXFSZ) { | |
377 if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
378 return true; | |
379 } else { | |
380 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
381 char buf[64]; | |
382 warning("Ignoring %s - see 4229104 or 6499219", | |
383 os::exception_name(sig, buf, sizeof(buf))); | |
384 | |
385 } | |
386 return true; | |
387 } | |
388 } | |
389 | |
390 JavaThread* thread = NULL; | |
391 VMThread* vmthread = NULL; | |
392 | |
393 if (os::Solaris::signal_handlers_are_installed) { | |
394 if (t != NULL ){ | |
395 if(t->is_Java_thread()) { | |
396 thread = (JavaThread*)t; | |
397 } | |
398 else if(t->is_VM_thread()){ | |
399 vmthread = (VMThread *)t; | |
400 } | |
401 } | |
402 } | |
403 | |
404 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs"); | |
405 | |
406 if (sig == os::Solaris::SIGasync()) { | |
10405 | 407 if(thread || vmthread){ |
408 OSThread::SR_handler(t, uc); | |
0 | 409 return true; |
410 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
411 return true; | |
412 } else { | |
413 // If os::Solaris::SIGasync not chained, and this is a non-vm and | |
414 // non-java thread | |
415 return true; | |
416 } | |
417 } | |
418 | |
419 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { | |
420 // can't decode this kind of signal | |
421 info = NULL; | |
422 } else { | |
423 assert(sig == info->si_signo, "bad siginfo"); | |
424 } | |
425 | |
426 // decide if this trap can be handled by a stub | |
427 address stub = NULL; | |
428 | |
429 address pc = NULL; | |
430 | |
431 //%note os_trap_1 | |
432 if (info != NULL && uc != NULL && thread != NULL) { | |
433 // factor me: getPCfromContext | |
434 pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
435 | |
11127 | 436 if (StubRoutines::is_safefetch_fault(pc)) { |
437 uc->uc_mcontext.gregs[REG_PC] = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc)); | |
438 return true; | |
0 | 439 } |
440 | |
441 // Handle ALL stack overflow variations here | |
442 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) { | |
443 address addr = (address) info->si_addr; | |
444 if (thread->in_stack_yellow_zone(addr)) { | |
445 thread->disable_stack_yellow_zone(); | |
446 if (thread->thread_state() == _thread_in_Java) { | |
447 // Throw a stack overflow exception. Guard pages will be reenabled | |
448 // while unwinding the stack. | |
449 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); | |
450 } else { | |
451 // Thread was in the vm or native code. Return and try to finish. | |
452 return true; | |
453 } | |
454 } else if (thread->in_stack_red_zone(addr)) { | |
455 // Fatal red zone violation. Disable the guard pages and fall through | |
456 // to handle_unexpected_exception way down below. | |
457 thread->disable_stack_red_zone(); | |
458 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
459 } | |
460 } | |
461 | |
462 if (thread->thread_state() == _thread_in_vm) { | |
463 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) { | |
464 stub = StubRoutines::handler_for_unsafe_access(); | |
465 } | |
466 } | |
467 | |
468 if (thread->thread_state() == _thread_in_Java) { | |
469 // Support Safepoint Polling | |
470 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { | |
471 stub = SharedRuntime::get_poll_stub(pc); | |
472 } | |
473 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) { | |
474 // BugId 4454115: A read from a MappedByteBuffer can fault | |
475 // here if the underlying file has been truncated. | |
476 // Do not crash the VM in such a case. | |
477 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
478 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
479 if (nm != NULL && nm->has_unsafe_access()) { | |
480 stub = StubRoutines::handler_for_unsafe_access(); | |
481 } | |
482 } | |
483 else | |
484 if (sig == SIGFPE && info->si_code == FPE_INTDIV) { | |
485 // integer divide by zero | |
486 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
487 } | |
488 #ifndef AMD64 | |
489 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) { | |
490 // floating-point divide by zero | |
491 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
492 } | |
493 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) { | |
494 // The encoding of D2I in i486.ad can cause an exception prior | |
495 // to the fist instruction if there was an invalid operation | |
496 // pending. We want to dismiss that exception. From the win_32 | |
497 // side it also seems that if it really was the fist causing | |
498 // the exception that we do the d2i by hand with different | |
499 // rounding. Seems kind of weird. QQQ TODO | |
500 // Note that we take the exception at the NEXT floating point instruction. | |
501 if (pc[0] == 0xDB) { | |
502 assert(pc[0] == 0xDB, "not a FIST opcode"); | |
503 assert(pc[1] == 0x14, "not a FIST opcode"); | |
504 assert(pc[2] == 0x24, "not a FIST opcode"); | |
505 return true; | |
506 } else { | |
507 assert(pc[-3] == 0xDB, "not an flt invalid opcode"); | |
508 assert(pc[-2] == 0x14, "not an flt invalid opcode"); | |
509 assert(pc[-1] == 0x24, "not an flt invalid opcode"); | |
510 } | |
511 } | |
512 else if (sig == SIGFPE ) { | |
513 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code); | |
514 } | |
515 #endif // !AMD64 | |
516 | |
517 // QQQ It doesn't seem that we need to do this on x86 because we should be able | |
518 // to return properly from the handler without this extra stuff on the back side. | |
519 | |
520 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { | |
521 // Determination of interpreter/vtable stub/compiled code null exception | |
522 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); | |
523 } | |
524 } | |
525 | |
526 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
527 // and the heap gets shrunk before the field access. | |
528 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
529 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
530 if (addr != (address)-1) { | |
531 stub = addr; | |
532 } | |
533 } | |
534 | |
535 // Check to see if we caught the safepoint code in the | |
536 // process of write protecting the memory serialization page. | |
537 // It write enables the page immediately after protecting it | |
538 // so we can just return to retry the write. | |
539 if ((sig == SIGSEGV) && | |
540 os::is_memory_serialize_page(thread, (address)info->si_addr)) { | |
541 // Block current thread until the memory serialize page permission restored. | |
542 os::block_on_serialize_page_trap(); | |
543 return true; | |
544 } | |
545 } | |
546 | |
547 // Execution protection violation | |
548 // | |
549 // Preventative code for future versions of Solaris which may | |
550 // enable execution protection when running the 32-bit VM on AMD64. | |
551 // | |
552 // This should be kept as the last step in the triage. We don't | |
553 // have a dedicated trap number for a no-execute fault, so be | |
554 // conservative and allow other handlers the first shot. | |
555 // | |
556 // Note: We don't test that info->si_code == SEGV_ACCERR here. | |
557 // this si_code is so generic that it is almost meaningless; and | |
558 // the si_code for this condition may change in the future. | |
559 // Furthermore, a false-positive should be harmless. | |
560 if (UnguardOnExecutionViolation > 0 && | |
561 (sig == SIGSEGV || sig == SIGBUS) && | |
562 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault | |
563 int page_size = os::vm_page_size(); | |
564 address addr = (address) info->si_addr; | |
565 address pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
566 // Make sure the pc and the faulting address are sane. | |
567 // | |
568 // If an instruction spans a page boundary, and the page containing | |
569 // the beginning of the instruction is executable but the following | |
570 // page is not, the pc and the faulting address might be slightly | |
571 // different - we still want to unguard the 2nd page in this case. | |
572 // | |
573 // 15 bytes seems to be a (very) safe value for max instruction size. | |
574 bool pc_is_near_addr = | |
575 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
576 bool instr_spans_page_boundary = | |
577 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
578 (intptr_t) page_size) > 0); | |
579 | |
580 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
581 static volatile address last_addr = | |
582 (address) os::non_memory_address_word(); | |
583 | |
584 // In conservative mode, don't unguard unless the address is in the VM | |
585 if (addr != last_addr && | |
586 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
587 | |
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588 // Make memory rwx and retry |
0 | 589 address page_start = |
590 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
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591 bool res = os::protect_memory((char*) page_start, page_size, |
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592 os::MEM_PROT_RWX); |
0 | 593 |
594 if (PrintMiscellaneous && Verbose) { | |
595 char buf[256]; | |
596 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
597 "at " INTPTR_FORMAT | |
598 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, | |
599 page_start, (res ? "success" : "failed"), errno); | |
600 tty->print_raw_cr(buf); | |
601 } | |
602 stub = pc; | |
603 | |
604 // Set last_addr so if we fault again at the same address, we don't end | |
605 // up in an endless loop. | |
606 // | |
607 // There are two potential complications here. Two threads trapping at | |
608 // the same address at the same time could cause one of the threads to | |
609 // think it already unguarded, and abort the VM. Likely very rare. | |
610 // | |
611 // The other race involves two threads alternately trapping at | |
612 // different addresses and failing to unguard the page, resulting in | |
613 // an endless loop. This condition is probably even more unlikely than | |
614 // the first. | |
615 // | |
616 // Although both cases could be avoided by using locks or thread local | |
617 // last_addr, these solutions are unnecessary complication: this | |
618 // handler is a best-effort safety net, not a complete solution. It is | |
619 // disabled by default and should only be used as a workaround in case | |
620 // we missed any no-execute-unsafe VM code. | |
621 | |
622 last_addr = addr; | |
623 } | |
624 } | |
625 } | |
626 | |
627 if (stub != NULL) { | |
628 // save all thread context in case we need to restore it | |
629 | |
630 if (thread != NULL) thread->set_saved_exception_pc(pc); | |
631 // 12/02/99: On Sparc it appears that the full context is also saved | |
632 // but as yet, no one looks at or restores that saved context | |
633 // factor me: setPC | |
634 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; | |
635 return true; | |
636 } | |
637 | |
638 // signal-chaining | |
639 if (os::Solaris::chained_handler(sig, info, ucVoid)) { | |
640 return true; | |
641 } | |
642 | |
643 #ifndef AMD64 | |
644 // Workaround (bug 4900493) for Solaris kernel bug 4966651. | |
645 // Handle an undefined selector caused by an attempt to assign | |
646 // fs in libthread getipriptr(). With the current libthread design every 512 | |
647 // thread creations the LDT for a private thread data structure is extended | |
648 // and thre is a hazard that and another thread attempting a thread creation | |
649 // will use a stale LDTR that doesn't reflect the structure's growth, | |
650 // causing a GP fault. | |
651 // Enforce the probable limit of passes through here to guard against an | |
652 // infinite loop if some other move to fs caused the GP fault. Note that | |
653 // this loop counter is ultimately a heuristic as it is possible for | |
654 // more than one thread to generate this fault at a time in an MP system. | |
655 // In the case of the loop count being exceeded or if the poll fails | |
656 // just fall through to a fatal error. | |
657 // If there is some other source of T_GPFLT traps and the text at EIP is | |
658 // unreadable this code will loop infinitely until the stack is exausted. | |
659 // The key to diagnosis in this case is to look for the bottom signal handler | |
660 // frame. | |
661 | |
662 if(! IgnoreLibthreadGPFault) { | |
663 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) { | |
664 const unsigned char *p = | |
665 (unsigned const char *) uc->uc_mcontext.gregs[EIP]; | |
666 | |
667 // Expected instruction? | |
668 | |
669 if(p[0] == movlfs[0] && p[1] == movlfs[1]) { | |
670 | |
671 Atomic::inc(&ldtr_refresh); | |
672 | |
673 // Infinite loop? | |
674 | |
675 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) { | |
676 | |
677 // No, force scheduling to get a fresh view of the LDTR | |
678 | |
679 if(poll(NULL, 0, 10) == 0) { | |
680 | |
681 // Retry the move | |
682 | |
683 return false; | |
684 } | |
685 } | |
686 } | |
687 } | |
688 } | |
689 #endif // !AMD64 | |
690 | |
691 if (!abort_if_unrecognized) { | |
692 // caller wants another chance, so give it to him | |
693 return false; | |
694 } | |
695 | |
696 if (!os::Solaris::libjsig_is_loaded) { | |
697 struct sigaction oldAct; | |
698 sigaction(sig, (struct sigaction *)0, &oldAct); | |
699 if (oldAct.sa_sigaction != signalHandler) { | |
700 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
701 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
605 | 702 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand); |
0 | 703 } |
704 } | |
705 | |
706 if (pc == NULL && uc != NULL) { | |
707 pc = (address) uc->uc_mcontext.gregs[REG_PC]; | |
708 } | |
709 | |
710 // unmask current signal | |
711 sigset_t newset; | |
712 sigemptyset(&newset); | |
713 sigaddset(&newset, sig); | |
714 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
715 | |
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716 // Determine which sort of error to throw. Out of swap may signal |
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717 // on the thread stack, which could get a mapping error when touched. |
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718 address addr = (address) info->si_addr; |
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719 if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) { |
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720 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack."); |
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721 } |
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722 |
0 | 723 VMError err(t, sig, pc, info, ucVoid); |
724 err.report_and_die(); | |
725 | |
726 ShouldNotReachHere(); | |
727 } | |
728 | |
729 void os::print_context(outputStream *st, void *context) { | |
730 if (context == NULL) return; | |
731 | |
732 ucontext_t *uc = (ucontext_t*)context; | |
733 st->print_cr("Registers:"); | |
734 #ifdef AMD64 | |
735 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); | |
736 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); | |
737 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); | |
738 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); | |
739 st->cr(); | |
740 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); | |
741 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); | |
742 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); | |
743 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); | |
744 st->cr(); | |
1907 | 745 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); |
746 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); | |
0 | 747 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); |
748 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); | |
1250 | 749 st->cr(); |
750 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); | |
0 | 751 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); |
752 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); | |
753 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); | |
754 st->cr(); | |
755 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); | |
756 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]); | |
757 #else | |
758 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]); | |
759 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]); | |
760 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]); | |
761 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]); | |
762 st->cr(); | |
763 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]); | |
764 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]); | |
765 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]); | |
766 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]); | |
767 st->cr(); | |
768 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]); | |
769 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]); | |
770 #endif // AMD64 | |
771 st->cr(); | |
772 st->cr(); | |
773 | |
774 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc); | |
775 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
776 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); | |
777 st->cr(); | |
778 | |
779 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
780 // point to garbage if entry point in an nmethod is corrupted. Leave | |
781 // this at the end, and hope for the best. | |
782 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc); | |
783 address pc = epc.pc(); | |
784 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
1907 | 785 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
786 } | |
787 | |
788 void os::print_register_info(outputStream *st, void *context) { | |
789 if (context == NULL) return; | |
790 | |
791 ucontext_t *uc = (ucontext_t*)context; | |
792 | |
793 st->print_cr("Register to memory mapping:"); | |
794 st->cr(); | |
795 | |
796 // this is horrendously verbose but the layout of the registers in the | |
797 // context does not match how we defined our abstract Register set, so | |
798 // we can't just iterate through the gregs area | |
799 | |
800 // this is only for the "general purpose" registers | |
801 | |
802 #ifdef AMD64 | |
803 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); | |
804 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); | |
805 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); | |
806 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); | |
807 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); | |
808 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); | |
809 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); | |
810 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); | |
811 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); | |
812 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); | |
813 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); | |
814 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); | |
815 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); | |
816 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); | |
817 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); | |
818 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); | |
819 #else | |
820 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]); | |
821 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]); | |
822 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]); | |
823 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]); | |
824 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]); | |
825 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]); | |
826 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]); | |
827 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]); | |
828 #endif | |
829 | |
830 st->cr(); | |
0 | 831 } |
832 | |
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833 |
0 | 834 #ifdef AMD64 |
835 void os::Solaris::init_thread_fpu_state(void) { | |
836 // Nothing to do | |
837 } | |
838 #else | |
839 // From solaris_i486.s | |
840 extern "C" void fixcw(); | |
841 | |
842 void os::Solaris::init_thread_fpu_state(void) { | |
843 // Set fpu to 53 bit precision. This happens too early to use a stub. | |
844 fixcw(); | |
845 } | |
846 | |
847 // These routines are the initial value of atomic_xchg_entry(), | |
848 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry() | |
849 // until initialization is complete. | |
850 // TODO - replace with .il implementation when compiler supports it. | |
851 | |
852 typedef jint xchg_func_t (jint, volatile jint*); | |
853 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); | |
854 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong); | |
855 typedef jint add_func_t (jint, volatile jint*); | |
856 | |
857 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { | |
858 // try to use the stub: | |
859 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry()); | |
860 | |
861 if (func != NULL) { | |
862 os::atomic_xchg_func = func; | |
863 return (*func)(exchange_value, dest); | |
864 } | |
865 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
866 | |
867 jint old_value = *dest; | |
868 *dest = exchange_value; | |
869 return old_value; | |
870 } | |
871 | |
872 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) { | |
873 // try to use the stub: | |
874 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); | |
875 | |
876 if (func != NULL) { | |
877 os::atomic_cmpxchg_func = func; | |
878 return (*func)(exchange_value, dest, compare_value); | |
879 } | |
880 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
881 | |
882 jint old_value = *dest; | |
883 if (old_value == compare_value) | |
884 *dest = exchange_value; | |
885 return old_value; | |
886 } | |
887 | |
888 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) { | |
889 // try to use the stub: | |
890 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); | |
891 | |
892 if (func != NULL) { | |
893 os::atomic_cmpxchg_long_func = func; | |
894 return (*func)(exchange_value, dest, compare_value); | |
895 } | |
896 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
897 | |
898 jlong old_value = *dest; | |
899 if (old_value == compare_value) | |
900 *dest = exchange_value; | |
901 return old_value; | |
902 } | |
903 | |
904 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) { | |
905 // try to use the stub: | |
906 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry()); | |
907 | |
908 if (func != NULL) { | |
909 os::atomic_add_func = func; | |
910 return (*func)(add_value, dest); | |
911 } | |
912 assert(Threads::number_of_threads() == 0, "for bootstrap only"); | |
913 | |
914 return (*dest) += add_value; | |
915 } | |
916 | |
917 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; | |
918 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; | |
919 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; | |
920 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; | |
921 | |
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922 extern "C" void _solaris_raw_setup_fpu(address ptr); |
0 | 923 void os::setup_fpu() { |
924 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); | |
925 _solaris_raw_setup_fpu(fpu_cntrl); | |
926 } | |
927 #endif // AMD64 | |
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928 |
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929 #ifndef PRODUCT |
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930 void os::verify_stack_alignment() { |
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931 #ifdef AMD64 |
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932 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); |
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933 #endif |
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934 } |
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935 #endif |