1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
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
26 #include "asm/macroAssembler.hpp"
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/atomic.inline.hpp"
42 #include "runtime/extendedPC.hpp"
43 #include "runtime/frame.inline.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/java.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/mutexLocker.hpp"
48 #include "runtime/osThread.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/stubRoutines.hpp"
51 #include "runtime/thread.inline.hpp"
52 #include "runtime/timer.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/vmError.hpp"
55
56 // put OS-includes here
57 # include <sys/types.h>
58 # include <sys/mman.h>
59 # include <pthread.h>
60 # include <signal.h>
61 # include <setjmp.h>
62 # include <errno.h>
63 # include <dlfcn.h>
64 # include <stdio.h>
65 # include <unistd.h>
66 # include <sys/resource.h>
67 # include <thread.h>
68 # include <sys/stat.h>
69 # include <sys/time.h>
70 # include <sys/filio.h>
71 # include <sys/utsname.h>
72 # include <sys/systeminfo.h>
73 # include <sys/socket.h>
74 # include <sys/trap.h>
75 # include <sys/lwp.h>
76 # include <pwd.h>
77 # include <poll.h>
78 # include <sys/lwp.h>
79 # include <procfs.h> // see comment in <sys/procfs.h>
80
81 #ifndef AMD64
82 // QQQ seems useless at this point
83 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
84 #endif // AMD64
85 # include <sys/procfs.h> // see comment in <sys/procfs.h>
86
87
88 #define MAX_PATH (2 * K)
89
90 // Minimum stack size for the VM. It's easier to document a constant value
91 // but it's different for x86 and sparc because the page sizes are different.
92 #ifdef AMD64
93 size_t os::Solaris::min_stack_allowed = 224*K;
94 #define REG_SP REG_RSP
95 #define REG_PC REG_RIP
96 #define REG_FP REG_RBP
97 #else
98 size_t os::Solaris::min_stack_allowed = 64*K;
99 #define REG_SP UESP
100 #define REG_PC EIP
101 #define REG_FP EBP
102 // 4900493 counter to prevent runaway LDTR refresh attempt
103
104 static volatile int ldtr_refresh = 0;
105 // the libthread instruction that faults because of the stale LDTR
106
107 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs
108 };
109 #endif // AMD64
110
111 char* os::non_memory_address_word() {
112 // Must never look like an address returned by reserve_memory,
113 // even in its subfields (as defined by the CPU immediate fields,
114 // if the CPU splits constants across multiple instructions).
115 return (char*) -1;
116 }
117
118 //
119 // Validate a ucontext retrieved from walking a uc_link of a ucontext.
120 // There are issues with libthread giving out uc_links for different threads
121 // on the same uc_link chain and bad or circular links.
122 //
123 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) {
124 if (valid >= suspect ||
125 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
126 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp ||
127 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) {
128 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
129 return false;
130 }
131
132 if (thread->is_Java_thread()) {
133 if (!valid_stack_address(thread, (address)suspect)) {
134 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
135 return false;
136 }
137 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) {
138 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
139 return false;
140 }
141 }
142 return true;
143 }
144
145 // We will only follow one level of uc_link since there are libthread
146 // issues with ucontext linking and it is better to be safe and just
147 // let caller retry later.
148 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
149 ucontext_t *uc) {
150
151 ucontext_t *retuc = NULL;
152
153 if (uc != NULL) {
154 if (uc->uc_link == NULL) {
155 // cannot validate without uc_link so accept current ucontext
156 retuc = uc;
157 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
158 // first ucontext is valid so try the next one
159 uc = uc->uc_link;
160 if (uc->uc_link == NULL) {
161 // cannot validate without uc_link so accept current ucontext
162 retuc = uc;
163 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
164 // the ucontext one level down is also valid so return it
165 retuc = uc;
166 }
167 }
168 }
169 return retuc;
170 }
171
172 // Assumes ucontext is valid
173 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) {
174 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]);
175 }
176
177 // Assumes ucontext is valid
178 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) {
179 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
180 }
181
182 // Assumes ucontext is valid
183 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) {
184 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
185 }
186
187 address os::Solaris::ucontext_get_pc(ucontext_t *uc) {
188 return (address) uc->uc_mcontext.gregs[REG_PC];
189 }
190
191 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
192 // is currently interrupted by SIGPROF.
193 //
194 // The difference between this and os::fetch_frame_from_context() is that
195 // here we try to skip nested signal frames.
196 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
197 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
198
199 assert(thread != NULL, "just checking");
200 assert(ret_sp != NULL, "just checking");
201 assert(ret_fp != NULL, "just checking");
202
203 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc);
204 return os::fetch_frame_from_context(luc, ret_sp, ret_fp);
205 }
206
207 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
208 intptr_t** ret_sp, intptr_t** ret_fp) {
209
210 ExtendedPC epc;
211 ucontext_t *uc = (ucontext_t*)ucVoid;
212
213 if (uc != NULL) {
214 epc = os::Solaris::ucontext_get_ExtendedPC(uc);
215 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc);
216 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc);
217 } else {
218 // construct empty ExtendedPC for return value checking
219 epc = ExtendedPC(NULL);
220 if (ret_sp) *ret_sp = (intptr_t *)NULL;
221 if (ret_fp) *ret_fp = (intptr_t *)NULL;
222 }
223
224 return epc;
225 }
226
227 frame os::fetch_frame_from_context(void* ucVoid) {
228 intptr_t* sp;
229 intptr_t* fp;
230 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
231 return frame(sp, fp, epc.pc());
232 }
233
234 frame os::get_sender_for_C_frame(frame* fr) {
235 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
236 }
237
238 extern "C" intptr_t *_get_current_sp(); // in .il file
239
240 address os::current_stack_pointer() {
241 return (address)_get_current_sp();
242 }
243
244 extern "C" intptr_t *_get_current_fp(); // in .il file
245
246 frame os::current_frame() {
247 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp
248 frame myframe((intptr_t*)os::current_stack_pointer(),
249 (intptr_t*)fp,
250 CAST_FROM_FN_PTR(address, os::current_frame));
251 if (os::is_first_C_frame(&myframe)) {
252 // stack is not walkable
253 frame ret; // This will be a null useless frame
254 return ret;
255 } else {
256 return os::get_sender_for_C_frame(&myframe);
257 }
258 }
259
260 #ifndef AMD64
261
262 // Detecting SSE support by OS
263 // From solaris_i486.s
264 extern "C" bool sse_check();
265 extern "C" bool sse_unavailable();
266
267 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED};
268 static int sse_status = SSE_UNKNOWN;
269
270
271 static void check_for_sse_support() {
272 if (!VM_Version::supports_sse()) {
273 sse_status = SSE_NOT_SUPPORTED;
274 return;
275 }
276 // looking for _sse_hw in libc.so, if it does not exist or
277 // the value (int) is 0, OS has no support for SSE
278 int *sse_hwp;
279 void *h;
280
281 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) {
282 //open failed, presume no support for SSE
283 sse_status = SSE_NOT_SUPPORTED;
284 return;
285 }
286 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) {
287 sse_status = SSE_NOT_SUPPORTED;
288 } else if (*sse_hwp == 0) {
289 sse_status = SSE_NOT_SUPPORTED;
290 }
291 dlclose(h);
292
293 if (sse_status == SSE_UNKNOWN) {
294 bool (*try_sse)() = (bool (*)())sse_check;
295 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED;
296 }
297
298 }
299
300 #endif // AMD64
301
302 bool os::supports_sse() {
303 #ifdef AMD64
304 return true;
305 #else
306 if (sse_status == SSE_UNKNOWN)
307 check_for_sse_support();
308 return sse_status == SSE_SUPPORTED;
309 #endif // AMD64
310 }
311
312 bool os::is_allocatable(size_t bytes) {
313 #ifdef AMD64
314 return true;
315 #else
316
317 if (bytes < 2 * G) {
318 return true;
319 }
320
321 char* addr = reserve_memory(bytes, NULL);
322
323 if (addr != NULL) {
324 release_memory(addr, bytes);
325 }
326
327 return addr != NULL;
328 #endif // AMD64
329
330 }
331
332 extern "C" JNIEXPORT int
333 JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid,
334 int abort_if_unrecognized) {
335 ucontext_t* uc = (ucontext_t*) ucVoid;
336
337 #ifndef AMD64
338 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) {
339 // the SSE instruction faulted. supports_sse() need return false.
340 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable;
341 return true;
342 }
343 #endif // !AMD64
344
345 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
346
347 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
348 // (no destructors can be run)
349 os::WatcherThreadCrashProtection::check_crash_protection(sig, t);
350
351 SignalHandlerMark shm(t);
352
353 if(sig == SIGPIPE || sig == SIGXFSZ) {
354 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
355 return true;
356 } else {
357 if (PrintMiscellaneous && (WizardMode || Verbose)) {
358 char buf[64];
359 warning("Ignoring %s - see 4229104 or 6499219",
360 os::exception_name(sig, buf, sizeof(buf)));
361
362 }
363 return true;
364 }
365 }
366
367 JavaThread* thread = NULL;
368 VMThread* vmthread = NULL;
369
370 if (os::Solaris::signal_handlers_are_installed) {
371 if (t != NULL ){
372 if(t->is_Java_thread()) {
373 thread = (JavaThread*)t;
374 }
375 else if(t->is_VM_thread()){
376 vmthread = (VMThread *)t;
377 }
378 }
379 }
380
381 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
382
383 if (sig == os::Solaris::SIGasync()) {
384 if(thread || vmthread){
385 OSThread::SR_handler(t, uc);
386 return true;
387 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
388 return true;
389 } else {
390 // If os::Solaris::SIGasync not chained, and this is a non-vm and
391 // non-java thread
392 return true;
393 }
394 }
395
396 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
397 // can't decode this kind of signal
398 info = NULL;
399 } else {
400 assert(sig == info->si_signo, "bad siginfo");
401 }
402
403 // decide if this trap can be handled by a stub
404 address stub = NULL;
405
406 address pc = NULL;
407
408 //%note os_trap_1
409 if (info != NULL && uc != NULL && thread != NULL) {
410 // factor me: getPCfromContext
411 pc = (address) uc->uc_mcontext.gregs[REG_PC];
412
413 if (StubRoutines::is_safefetch_fault(pc)) {
414 uc->uc_mcontext.gregs[REG_PC] = intptr_t(StubRoutines::continuation_for_safefetch_fault(pc));
415 return true;
416 }
417
418 // Handle ALL stack overflow variations here
419 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
420 address addr = (address) info->si_addr;
421 if (thread->in_stack_yellow_zone(addr)) {
422 thread->disable_stack_yellow_zone();
423 if (thread->thread_state() == _thread_in_Java) {
424 // Throw a stack overflow exception. Guard pages will be reenabled
425 // while unwinding the stack.
426 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
427 } else {
428 // Thread was in the vm or native code. Return and try to finish.
429 return true;
430 }
431 } else if (thread->in_stack_red_zone(addr)) {
432 // Fatal red zone violation. Disable the guard pages and fall through
433 // to handle_unexpected_exception way down below.
434 thread->disable_stack_red_zone();
435 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
436 }
437 }
438
439 if ((sig == SIGSEGV) && VM_Version::is_cpuinfo_segv_addr(pc)) {
440 // Verify that OS save/restore AVX registers.
441 stub = VM_Version::cpuinfo_cont_addr();
442 }
443
444 if (thread->thread_state() == _thread_in_vm) {
445 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
446 stub = StubRoutines::handler_for_unsafe_access();
447 }
448 }
449
450 if (thread->thread_state() == _thread_in_Java) {
451 // Support Safepoint Polling
452 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
453 stub = SharedRuntime::get_poll_stub(pc);
454 }
455 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
456 // BugId 4454115: A read from a MappedByteBuffer can fault
457 // here if the underlying file has been truncated.
458 // Do not crash the VM in such a case.
459 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
460 if (cb != NULL) {
461 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
462 if (nm != NULL && nm->has_unsafe_access()) {
463 stub = StubRoutines::handler_for_unsafe_access();
464 }
465 }
466 }
467 else
468 if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
469 // integer divide by zero
470 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
471 }
472 #ifndef AMD64
473 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
474 // floating-point divide by zero
475 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
476 }
477 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) {
478 // The encoding of D2I in i486.ad can cause an exception prior
479 // to the fist instruction if there was an invalid operation
480 // pending. We want to dismiss that exception. From the win_32
481 // side it also seems that if it really was the fist causing
482 // the exception that we do the d2i by hand with different
483 // rounding. Seems kind of weird. QQQ TODO
484 // Note that we take the exception at the NEXT floating point instruction.
485 if (pc[0] == 0xDB) {
486 assert(pc[0] == 0xDB, "not a FIST opcode");
487 assert(pc[1] == 0x14, "not a FIST opcode");
488 assert(pc[2] == 0x24, "not a FIST opcode");
489 return true;
490 } else {
491 assert(pc[-3] == 0xDB, "not an flt invalid opcode");
492 assert(pc[-2] == 0x14, "not an flt invalid opcode");
493 assert(pc[-1] == 0x24, "not an flt invalid opcode");
494 }
495 }
496 else if (sig == SIGFPE ) {
497 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code);
498 }
499 #endif // !AMD64
500
501 // QQQ It doesn't seem that we need to do this on x86 because we should be able
502 // to return properly from the handler without this extra stuff on the back side.
503
504 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
505 // Determination of interpreter/vtable stub/compiled code null exception
506 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
507 }
508 }
509
510 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
511 // and the heap gets shrunk before the field access.
512 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
513 address addr = JNI_FastGetField::find_slowcase_pc(pc);
514 if (addr != (address)-1) {
515 stub = addr;
516 }
517 }
518
519 // Check to see if we caught the safepoint code in the
520 // process of write protecting the memory serialization page.
521 // It write enables the page immediately after protecting it
522 // so we can just return to retry the write.
523 if ((sig == SIGSEGV) &&
524 os::is_memory_serialize_page(thread, (address)info->si_addr)) {
525 // Block current thread until the memory serialize page permission restored.
526 os::block_on_serialize_page_trap();
527 return true;
528 }
529 }
530
531 // Execution protection violation
532 //
533 // Preventative code for future versions of Solaris which may
534 // enable execution protection when running the 32-bit VM on AMD64.
535 //
536 // This should be kept as the last step in the triage. We don't
537 // have a dedicated trap number for a no-execute fault, so be
538 // conservative and allow other handlers the first shot.
539 //
540 // Note: We don't test that info->si_code == SEGV_ACCERR here.
541 // this si_code is so generic that it is almost meaningless; and
542 // the si_code for this condition may change in the future.
543 // Furthermore, a false-positive should be harmless.
544 if (UnguardOnExecutionViolation > 0 &&
545 (sig == SIGSEGV || sig == SIGBUS) &&
546 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault
547 int page_size = os::vm_page_size();
548 address addr = (address) info->si_addr;
549 address pc = (address) uc->uc_mcontext.gregs[REG_PC];
550 // Make sure the pc and the faulting address are sane.
551 //
552 // If an instruction spans a page boundary, and the page containing
553 // the beginning of the instruction is executable but the following
554 // page is not, the pc and the faulting address might be slightly
555 // different - we still want to unguard the 2nd page in this case.
556 //
557 // 15 bytes seems to be a (very) safe value for max instruction size.
558 bool pc_is_near_addr =
559 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
560 bool instr_spans_page_boundary =
561 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
562 (intptr_t) page_size) > 0);
563
564 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
565 static volatile address last_addr =
566 (address) os::non_memory_address_word();
567
568 // In conservative mode, don't unguard unless the address is in the VM
569 if (addr != last_addr &&
570 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
571
572 // Make memory rwx and retry
573 address page_start =
574 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
575 bool res = os::protect_memory((char*) page_start, page_size,
576 os::MEM_PROT_RWX);
577
578 if (PrintMiscellaneous && Verbose) {
579 char buf[256];
580 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
581 "at " INTPTR_FORMAT
582 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr,
583 page_start, (res ? "success" : "failed"), errno);
584 tty->print_raw_cr(buf);
585 }
586 stub = pc;
587
588 // Set last_addr so if we fault again at the same address, we don't end
589 // up in an endless loop.
590 //
591 // There are two potential complications here. Two threads trapping at
592 // the same address at the same time could cause one of the threads to
593 // think it already unguarded, and abort the VM. Likely very rare.
594 //
595 // The other race involves two threads alternately trapping at
596 // different addresses and failing to unguard the page, resulting in
597 // an endless loop. This condition is probably even more unlikely than
598 // the first.
599 //
600 // Although both cases could be avoided by using locks or thread local
601 // last_addr, these solutions are unnecessary complication: this
602 // handler is a best-effort safety net, not a complete solution. It is
603 // disabled by default and should only be used as a workaround in case
604 // we missed any no-execute-unsafe VM code.
605
606 last_addr = addr;
607 }
608 }
609 }
610
611 if (stub != NULL) {
612 // save all thread context in case we need to restore it
613
614 if (thread != NULL) thread->set_saved_exception_pc(pc);
615 // 12/02/99: On Sparc it appears that the full context is also saved
616 // but as yet, no one looks at or restores that saved context
617 // factor me: setPC
618 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub;
619 return true;
620 }
621
622 // signal-chaining
623 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
624 return true;
625 }
626
627 #ifndef AMD64
628 // Workaround (bug 4900493) for Solaris kernel bug 4966651.
629 // Handle an undefined selector caused by an attempt to assign
630 // fs in libthread getipriptr(). With the current libthread design every 512
631 // thread creations the LDT for a private thread data structure is extended
632 // and thre is a hazard that and another thread attempting a thread creation
633 // will use a stale LDTR that doesn't reflect the structure's growth,
634 // causing a GP fault.
635 // Enforce the probable limit of passes through here to guard against an
636 // infinite loop if some other move to fs caused the GP fault. Note that
637 // this loop counter is ultimately a heuristic as it is possible for
638 // more than one thread to generate this fault at a time in an MP system.
639 // In the case of the loop count being exceeded or if the poll fails
640 // just fall through to a fatal error.
641 // If there is some other source of T_GPFLT traps and the text at EIP is
642 // unreadable this code will loop infinitely until the stack is exausted.
643 // The key to diagnosis in this case is to look for the bottom signal handler
644 // frame.
645
646 if(! IgnoreLibthreadGPFault) {
647 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
648 const unsigned char *p =
649 (unsigned const char *) uc->uc_mcontext.gregs[EIP];
650
651 // Expected instruction?
652
653 if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
654
655 Atomic::inc(&ldtr_refresh);
656
657 // Infinite loop?
658
659 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
660
661 // No, force scheduling to get a fresh view of the LDTR
662
663 if(poll(NULL, 0, 10) == 0) {
664
665 // Retry the move
666
667 return false;
668 }
669 }
670 }
671 }
672 }
673 #endif // !AMD64
674
675 if (!abort_if_unrecognized) {
676 // caller wants another chance, so give it to him
677 return false;
678 }
679
680 if (!os::Solaris::libjsig_is_loaded) {
681 struct sigaction oldAct;
682 sigaction(sig, (struct sigaction *)0, &oldAct);
683 if (oldAct.sa_sigaction != signalHandler) {
684 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
685 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
686 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand);
687 }
688 }
689
690 if (pc == NULL && uc != NULL) {
691 pc = (address) uc->uc_mcontext.gregs[REG_PC];
692 }
693
694 // unmask current signal
695 sigset_t newset;
696 sigemptyset(&newset);
697 sigaddset(&newset, sig);
698 sigprocmask(SIG_UNBLOCK, &newset, NULL);
699
700 // Determine which sort of error to throw. Out of swap may signal
701 // on the thread stack, which could get a mapping error when touched.
702 address addr = (address) info->si_addr;
703 if (sig == SIGBUS && info->si_code == BUS_OBJERR && info->si_errno == ENOMEM) {
704 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "Out of swap space to map in thread stack.");
705 }
706
707 VMError err(t, sig, pc, info, ucVoid);
708 err.report_and_die();
709
710 ShouldNotReachHere();
711 return false;
712 }
713
714 void os::print_context(outputStream *st, void *context) {
715 if (context == NULL) return;
716
717 ucontext_t *uc = (ucontext_t*)context;
718 st->print_cr("Registers:");
719 #ifdef AMD64
720 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
721 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
722 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
723 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
724 st->cr();
725 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
726 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
727 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
728 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
729 st->cr();
730 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
731 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
732 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
733 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
734 st->cr();
735 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
736 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
737 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
738 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
739 st->cr();
740 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
741 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]);
742 #else
743 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]);
744 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]);
745 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]);
746 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]);
747 st->cr();
748 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]);
749 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]);
750 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]);
751 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]);
752 st->cr();
753 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]);
754 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]);
755 #endif // AMD64
756 st->cr();
757 st->cr();
758
759 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
760 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
761 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
762 st->cr();
763
764 // Note: it may be unsafe to inspect memory near pc. For example, pc may
765 // point to garbage if entry point in an nmethod is corrupted. Leave
766 // this at the end, and hope for the best.
767 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
768 address pc = epc.pc();
769 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
770 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
771 }
772
773 void os::print_register_info(outputStream *st, void *context) {
774 if (context == NULL) return;
775
776 ucontext_t *uc = (ucontext_t*)context;
777
778 st->print_cr("Register to memory mapping:");
779 st->cr();
780
781 // this is horrendously verbose but the layout of the registers in the
782 // context does not match how we defined our abstract Register set, so
783 // we can't just iterate through the gregs area
784
785 // this is only for the "general purpose" registers
786
787 #ifdef AMD64
788 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]);
789 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]);
790 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]);
791 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]);
792 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]);
793 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]);
794 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]);
795 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]);
796 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]);
797 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]);
798 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]);
799 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]);
800 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]);
801 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]);
802 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]);
803 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]);
804 #else
805 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[EAX]);
806 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[EBX]);
807 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[ECX]);
808 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[EDX]);
809 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[UESP]);
810 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[EBP]);
811 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[ESI]);
812 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[EDI]);
813 #endif
814
815 st->cr();
816 }
817
818
819 #ifdef AMD64
820 void os::Solaris::init_thread_fpu_state(void) {
821 // Nothing to do
822 }
823 #else
824 // From solaris_i486.s
825 extern "C" void fixcw();
826
827 void os::Solaris::init_thread_fpu_state(void) {
828 // Set fpu to 53 bit precision. This happens too early to use a stub.
829 fixcw();
830 }
831
832 // These routines are the initial value of atomic_xchg_entry(),
833 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry()
834 // until initialization is complete.
835 // TODO - replace with .il implementation when compiler supports it.
836
837 typedef jint xchg_func_t (jint, volatile jint*);
838 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
839 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
840 typedef jint add_func_t (jint, volatile jint*);
841
842 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
843 // try to use the stub:
844 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
845
846 if (func != NULL) {
847 os::atomic_xchg_func = func;
848 return (*func)(exchange_value, dest);
849 }
850 assert(Threads::number_of_threads() == 0, "for bootstrap only");
851
852 jint old_value = *dest;
853 *dest = exchange_value;
854 return old_value;
855 }
856
857 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
858 // try to use the stub:
859 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
860
861 if (func != NULL) {
862 os::atomic_cmpxchg_func = func;
863 return (*func)(exchange_value, dest, compare_value);
864 }
865 assert(Threads::number_of_threads() == 0, "for bootstrap only");
866
867 jint old_value = *dest;
868 if (old_value == compare_value)
869 *dest = exchange_value;
870 return old_value;
871 }
872
873 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
874 // try to use the stub:
875 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
876
877 if (func != NULL) {
878 os::atomic_cmpxchg_long_func = func;
879 return (*func)(exchange_value, dest, compare_value);
880 }
881 assert(Threads::number_of_threads() == 0, "for bootstrap only");
882
883 jlong old_value = *dest;
884 if (old_value == compare_value)
885 *dest = exchange_value;
886 return old_value;
887 }
888
889 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
890 // try to use the stub:
891 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
892
893 if (func != NULL) {
894 os::atomic_add_func = func;
895 return (*func)(add_value, dest);
896 }
897 assert(Threads::number_of_threads() == 0, "for bootstrap only");
898
899 return (*dest) += add_value;
900 }
901
902 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
903 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
904 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
905 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
906
907 extern "C" void _solaris_raw_setup_fpu(address ptr);
908 void os::setup_fpu() {
909 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
910 _solaris_raw_setup_fpu(fpu_cntrl);
911 }
912 #endif // AMD64
913
914 #ifndef PRODUCT
915 void os::verify_stack_alignment() {
916 #ifdef AMD64
917 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
918 #endif
919 }
920 #endif
921
922 int os::extra_bang_size_in_bytes() {
923 // JDK-8050147 requires the full cache line bang for x86.
924 return VM_Version::L1_line_size();
925 }