1 /*
2 * Copyright (c) 1999, 2017, 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 "jvm.h"
27 #include "asm/macroAssembler.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "nativeInst_sparc.hpp"
37 #include "os_share_linux.hpp"
38 #include "prims/jniFastGetField.hpp"
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.inline.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"
50 #include "runtime/thread.inline.hpp"
51 #include "runtime/timer.hpp"
52 #include "utilities/debug.hpp"
53 #include "utilities/events.hpp"
54 #include "utilities/vmError.hpp"
55
56 // Linux/Sparc has rather obscure naming of registers in sigcontext
57 // different between 32 and 64 bits
58 #define SIG_PC(x) ((x)->sigc_regs.tpc)
59 #define SIG_NPC(x) ((x)->sigc_regs.tnpc)
60 #define SIG_REGS(x) ((x)->sigc_regs)
61
62 // those are to reference registers in sigcontext
63 enum {
64 CON_G0 = 0,
65 CON_G1,
66 CON_G2,
67 CON_G3,
68 CON_G4,
69 CON_G5,
70 CON_G6,
71 CON_G7,
72 CON_O0,
73 CON_O1,
74 CON_O2,
75 CON_O3,
76 CON_O4,
77 CON_O5,
78 CON_O6,
79 CON_O7,
80 };
81
82 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
83 // currently interrupted by SIGPROF.
84 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested
85 // signal frames. Currently we don't do that on Linux, so it's the
86 // same as os::fetch_frame_from_context().
87 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
88 const ucontext_t* uc,
89 intptr_t** ret_sp,
90 intptr_t** ret_fp) {
91 assert(thread != NULL, "just checking");
92 assert(ret_sp != NULL, "just checking");
93 assert(ret_fp != NULL, "just checking");
94
95 return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
96 }
97
98 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
99 intptr_t** ret_sp,
100 intptr_t** ret_fp) {
101 const ucontext_t* uc = (const ucontext_t*) ucVoid;
102 ExtendedPC epc;
103
104 if (uc != NULL) {
105 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
106 if (ret_sp) {
107 *ret_sp = os::Linux::ucontext_get_sp(uc);
108 }
109 if (ret_fp) {
110 *ret_fp = (intptr_t*)NULL;
111 }
112 } else {
113 // construct empty ExtendedPC for return value checking
114 epc = ExtendedPC(NULL);
115 if (ret_sp) {
116 *ret_sp = (intptr_t*) NULL;
117 }
118 if (ret_fp) {
119 *ret_fp = (intptr_t*) NULL;
120 }
121 }
122
123 return epc;
124 }
125
126 frame os::fetch_frame_from_context(const void* ucVoid) {
127 intptr_t* sp;
128 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL);
129 return frame(sp, frame::unpatchable, epc.pc());
130 }
131
132 frame os::get_sender_for_C_frame(frame* fr) {
133 return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc());
134 }
135
136 frame os::current_frame() {
137 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
138 frame myframe(sp, frame::unpatchable,
139 CAST_FROM_FN_PTR(address, os::current_frame));
140 if (os::is_first_C_frame(&myframe)) {
141 // stack is not walkable
142 return frame(NULL, frame::unpatchable, NULL);
143 } else {
144 return os::get_sender_for_C_frame(&myframe);
145 }
146 }
147
148 address os::current_stack_pointer() {
149 register void *sp __asm__ ("sp");
150 return (address)sp;
151 }
152
153 char* os::non_memory_address_word() {
154 // Must never look like an address returned by reserve_memory,
155 // even in its subfields (as defined by the CPU immediate fields,
156 // if the CPU splits constants across multiple instructions).
157 // On SPARC, 0 != %hi(any real address), because there is no
158 // allocation in the first 1Kb of the virtual address space.
159 return (char*) 0;
160 }
161
162 void os::initialize_thread(Thread* thr) {}
163
164 void os::print_context(outputStream *st, const void *context) {
165 if (context == NULL) return;
166
167 const ucontext_t* uc = (const ucontext_t*)context;
168 sigcontext* sc = (sigcontext*)context;
169 st->print_cr("Registers:");
170
171 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT
172 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT,
173 SIG_REGS(sc).u_regs[CON_G1],
174 SIG_REGS(sc).u_regs[CON_G2],
175 SIG_REGS(sc).u_regs[CON_G3],
176 SIG_REGS(sc).u_regs[CON_G4]);
177 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT
178 " G7=" INTPTR_FORMAT " Y=0x%x",
179 SIG_REGS(sc).u_regs[CON_G5],
180 SIG_REGS(sc).u_regs[CON_G6],
181 SIG_REGS(sc).u_regs[CON_G7],
182 SIG_REGS(sc).y);
183 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT
184 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT,
185 SIG_REGS(sc).u_regs[CON_O0],
186 SIG_REGS(sc).u_regs[CON_O1],
187 SIG_REGS(sc).u_regs[CON_O2],
188 SIG_REGS(sc).u_regs[CON_O3]);
189 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT
190 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT,
191 SIG_REGS(sc).u_regs[CON_O4],
192 SIG_REGS(sc).u_regs[CON_O5],
193 SIG_REGS(sc).u_regs[CON_O6],
194 SIG_REGS(sc).u_regs[CON_O7]);
195
196
197 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
198 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT
199 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT,
200 sp[L0->sp_offset_in_saved_window()],
201 sp[L1->sp_offset_in_saved_window()],
202 sp[L2->sp_offset_in_saved_window()],
203 sp[L3->sp_offset_in_saved_window()]);
204 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT
205 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT,
206 sp[L4->sp_offset_in_saved_window()],
207 sp[L5->sp_offset_in_saved_window()],
208 sp[L6->sp_offset_in_saved_window()],
209 sp[L7->sp_offset_in_saved_window()]);
210 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT
211 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT,
212 sp[I0->sp_offset_in_saved_window()],
213 sp[I1->sp_offset_in_saved_window()],
214 sp[I2->sp_offset_in_saved_window()],
215 sp[I3->sp_offset_in_saved_window()]);
216 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT
217 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT,
218 sp[I4->sp_offset_in_saved_window()],
219 sp[I5->sp_offset_in_saved_window()],
220 sp[I6->sp_offset_in_saved_window()],
221 sp[I7->sp_offset_in_saved_window()]);
222
223 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT,
224 SIG_PC(sc),
225 SIG_NPC(sc));
226 st->cr();
227 st->cr();
228
229 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp));
230 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
231 st->cr();
232
233 // Note: it may be unsafe to inspect memory near pc. For example, pc may
234 // point to garbage if entry point in an nmethod is corrupted. Leave
235 // this at the end, and hope for the best.
236 address pc = os::Linux::ucontext_get_pc(uc);
237 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc));
238 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
239 }
240
241
242 void os::print_register_info(outputStream *st, const void *context) {
243 if (context == NULL) return;
244
245 const ucontext_t *uc = (const ucontext_t*)context;
246 const sigcontext* sc = (const sigcontext*)context;
247 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
248
249 st->print_cr("Register to memory mapping:");
250 st->cr();
251
252 // this is only for the "general purpose" registers
253 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]);
254 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]);
255 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]);
256 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]);
257 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]);
258 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]);
259 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]);
260 st->cr();
261
262 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]);
263 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]);
264 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]);
265 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]);
266 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]);
267 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]);
268 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]);
269 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]);
270 st->cr();
271
272 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]);
273 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]);
274 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]);
275 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]);
276 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]);
277 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]);
278 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]);
279 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]);
280 st->cr();
281
282 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]);
283 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]);
284 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]);
285 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]);
286 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]);
287 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]);
288 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]);
289 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]);
290 st->cr();
291 }
292
293
294 address os::Linux::ucontext_get_pc(const ucontext_t* uc) {
295 return (address) SIG_PC((sigcontext*)uc);
296 }
297
298 void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) {
299 sigcontext* ctx = (sigcontext*) uc;
300 SIG_PC(ctx) = (intptr_t)pc;
301 SIG_NPC(ctx) = (intptr_t)(pc+4);
302 }
303
304 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) {
305 return (intptr_t*)
306 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS);
307 }
308
309 // not used on Sparc
310 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) {
311 ShouldNotReachHere();
312 return NULL;
313 }
314
315 // Utility functions
316
317 inline static bool checkPrefetch(sigcontext* uc, address pc) {
318 if (StubRoutines::is_safefetch_fault(pc)) {
319 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc));
320 return true;
321 }
322 return false;
323 }
324
325 inline static bool checkOverflow(sigcontext* uc,
326 address pc,
327 address addr,
328 JavaThread* thread,
329 address* stub) {
330 // check if fault address is within thread stack
331 if (thread->on_local_stack(addr)) {
332 // stack overflow
333 if (thread->in_stack_yellow_reserved_zone(addr)) {
334 thread->disable_stack_yellow_reserved_zone();
335 if (thread->thread_state() == _thread_in_Java) {
336 // Throw a stack overflow exception. Guard pages will be reenabled
337 // while unwinding the stack.
338 *stub =
339 SharedRuntime::continuation_for_implicit_exception(thread,
340 pc,
341 SharedRuntime::STACK_OVERFLOW);
342 } else {
343 // Thread was in the vm or native code. Return and try to finish.
344 return true;
345 }
346 } else if (thread->in_stack_red_zone(addr)) {
347 // Fatal red zone violation. Disable the guard pages and fall through
348 // to handle_unexpected_exception way down below.
349 thread->disable_stack_red_zone();
350 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
351
352 // This is a likely cause, but hard to verify. Let's just print
353 // it as a hint.
354 tty->print_raw_cr("Please check if any of your loaded .so files has "
355 "enabled executable stack (see man page execstack(8))");
356 } else {
357 // Accessing stack address below sp may cause SEGV if current
358 // thread has MAP_GROWSDOWN stack. This should only happen when
359 // current thread was created by user code with MAP_GROWSDOWN flag
360 // and then attached to VM. See notes in os_linux.cpp.
361 if (thread->osthread()->expanding_stack() == 0) {
362 thread->osthread()->set_expanding_stack();
363 if (os::Linux::manually_expand_stack(thread, addr)) {
364 thread->osthread()->clear_expanding_stack();
365 return true;
366 }
367 thread->osthread()->clear_expanding_stack();
368 } else {
369 fatal("recursive segv. expanding stack.");
370 }
371 }
372 }
373 return false;
374 }
375
376 inline static bool checkPollingPage(address pc, address fault, address* stub) {
377 if (fault == os::get_polling_page()) {
378 *stub = SharedRuntime::get_poll_stub(pc);
379 return true;
380 }
381 return false;
382 }
383
384 inline static bool checkByteBuffer(address pc, address npc, JavaThread * thread, address* stub) {
385 // BugId 4454115: A read from a MappedByteBuffer can fault
386 // here if the underlying file has been truncated.
387 // Do not crash the VM in such a case.
388 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
389 CompiledMethod* nm = cb->as_compiled_method_or_null();
390 if (nm != NULL && nm->has_unsafe_access()) {
391 *stub = SharedRuntime::handle_unsafe_access(thread, npc);
392 return true;
393 }
394 return false;
395 }
396
397 inline static bool checkVerifyOops(address pc, address fault, address* stub) {
398 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0]
399 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) {
400 *stub = MacroAssembler::_verify_oop_implicit_branch[2];
401 warning("fixed up memory fault in +VerifyOops at address "
402 INTPTR_FORMAT, p2i(fault));
403 return true;
404 }
405 return false;
406 }
407
408 inline static bool checkFPFault(address pc, int code,
409 JavaThread* thread, address* stub) {
410 if (code == FPE_INTDIV || code == FPE_FLTDIV) {
411 *stub =
412 SharedRuntime::
413 continuation_for_implicit_exception(thread,
414 pc,
415 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
416 return true;
417 }
418 return false;
419 }
420
421 inline static bool checkNullPointer(address pc, intptr_t fault,
422 JavaThread* thread, address* stub) {
423 if (!MacroAssembler::needs_explicit_null_check(fault)) {
424 // Determination of interpreter/vtable stub/compiled code null
425 // exception
426 *stub =
427 SharedRuntime::
428 continuation_for_implicit_exception(thread, pc,
429 SharedRuntime::IMPLICIT_NULL);
430 return true;
431 }
432 return false;
433 }
434
435 inline static bool checkFastJNIAccess(address pc, address* stub) {
436 address addr = JNI_FastGetField::find_slowcase_pc(pc);
437 if (addr != (address)-1) {
438 *stub = addr;
439 return true;
440 }
441 return false;
442 }
443
444 inline static bool checkSerializePage(JavaThread* thread, address addr) {
445 return os::is_memory_serialize_page(thread, addr);
446 }
447
448 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) {
449 if (nativeInstruction_at(*pc)->is_zombie()) {
450 // zombie method (ld [%g0],%o7 instruction)
451 *stub = SharedRuntime::get_handle_wrong_method_stub();
452
453 // At the stub it needs to look like a call from the caller of this
454 // method (not a call from the segv site).
455 *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
456 return true;
457 }
458 return false;
459 }
460
461 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) {
462 #ifdef COMPILER2
463 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) {
464 #ifdef ASSERT
465 #ifdef TIERED
466 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc);
467 assert(cb->is_compiled_by_c2(), "Wrong compiler");
468 #endif // TIERED
469 #endif // ASSERT
470 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken.
471 *stub = SharedRuntime::get_ic_miss_stub();
472 // At the stub it needs to look like a call from the caller of this
473 // method (not a call from the segv site).
474 *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
475 return true;
476 }
477 #endif // COMPILER2
478 return false;
479 }
480
481 extern "C" JNIEXPORT int
482 JVM_handle_linux_signal(int sig,
483 siginfo_t* info,
484 void* ucVoid,
485 int abort_if_unrecognized) {
486 // in fact this isn't ucontext_t* at all, but struct sigcontext*
487 // but Linux porting layer uses ucontext_t, so to minimize code change
488 // we cast as needed
489 ucontext_t* ucFake = (ucontext_t*) ucVoid;
490 sigcontext* uc = (sigcontext*)ucVoid;
491
492 Thread* t = Thread::current_or_null_safe();
493
494 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
495 // (no destructors can be run)
496 os::ThreadCrashProtection::check_crash_protection(sig, t);
497
498 SignalHandlerMark shm(t);
499
500 // Note: it's not uncommon that JNI code uses signal/sigset to install
501 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
502 // or have a SIGILL handler when detecting CPU type). When that happens,
503 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
504 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
505 // that do not require siginfo/ucontext first.
506
507 if (sig == SIGPIPE || sig == SIGXFSZ) {
508 // allow chained handler to go first
509 if (os::Linux::chained_handler(sig, info, ucVoid)) {
510 return true;
511 } else {
512 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
513 return true;
514 }
515 }
516
517 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
518 if ( (sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) {
519 handle_assert_poison_fault(ucVoid, info->si_addr);
520 return 1;
521 }
522 #endif
523
524 JavaThread* thread = NULL;
525 VMThread* vmthread = NULL;
526 if (os::Linux::signal_handlers_are_installed) {
527 if (t != NULL ){
528 if(t->is_Java_thread()) {
529 thread = (JavaThread*)t;
530 }
531 else if(t->is_VM_thread()){
532 vmthread = (VMThread *)t;
533 }
534 }
535 }
536
537 // decide if this trap can be handled by a stub
538 address stub = NULL;
539 address pc = NULL;
540 address npc = NULL;
541
542 //%note os_trap_1
543 if (info != NULL && uc != NULL && thread != NULL) {
544 pc = address(SIG_PC(uc));
545 npc = address(SIG_NPC(uc));
546
547 // Check to see if we caught the safepoint code in the
548 // process of write protecting the memory serialization page.
549 // It write enables the page immediately after protecting it
550 // so we can just return to retry the write.
551 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) {
552 // Block current thread until the memory serialize page permission restored.
553 os::block_on_serialize_page_trap();
554 return 1;
555 }
556
557 if (checkPrefetch(uc, pc)) {
558 return 1;
559 }
560
561 // Handle ALL stack overflow variations here
562 if (sig == SIGSEGV) {
563 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) {
564 return 1;
565 }
566 }
567
568 if (sig == SIGBUS &&
569 thread->thread_state() == _thread_in_vm &&
570 thread->doing_unsafe_access()) {
571 stub = SharedRuntime::handle_unsafe_access(thread, npc);
572 }
573
574 if (thread->thread_state() == _thread_in_Java) {
575 do {
576 // Java thread running in Java code => find exception handler if any
577 // a fault inside compiled code, the interpreter, or a stub
578
579 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) {
580 break;
581 }
582
583 if ((sig == SIGBUS) && checkByteBuffer(pc, npc, thread, &stub)) {
584 break;
585 }
586
587 if ((sig == SIGSEGV || sig == SIGBUS) &&
588 checkVerifyOops(pc, (address)info->si_addr, &stub)) {
589 break;
590 }
591
592 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) {
593 break;
594 }
595
596 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) {
597 break;
598 }
599
600 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) {
601 break;
602 }
603
604 if ((sig == SIGSEGV) &&
605 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) {
606 break;
607 }
608 } while (0);
609
610 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
611 // and the heap gets shrunk before the field access.
612 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
613 checkFastJNIAccess(pc, &stub);
614 }
615 }
616
617 if (stub != NULL) {
618 // save all thread context in case we need to restore it
619 thread->set_saved_exception_pc(pc);
620 thread->set_saved_exception_npc(npc);
621 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub);
622 return true;
623 }
624 }
625
626 // signal-chaining
627 if (os::Linux::chained_handler(sig, info, ucVoid)) {
628 return true;
629 }
630
631 if (!abort_if_unrecognized) {
632 // caller wants another chance, so give it to him
633 return false;
634 }
635
636 if (pc == NULL && uc != NULL) {
637 pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc);
638 }
639
640 // unmask current signal
641 sigset_t newset;
642 sigemptyset(&newset);
643 sigaddset(&newset, sig);
644 sigprocmask(SIG_UNBLOCK, &newset, NULL);
645
646 VMError::report_and_die(t, sig, pc, info, ucVoid);
647
648 ShouldNotReachHere();
649 return false;
650 }
651
652 void os::Linux::init_thread_fpu_state(void) {
653 // Nothing to do
654 }
655
656 int os::Linux::get_fpu_control_word() {
657 return 0;
658 }
659
660 void os::Linux::set_fpu_control_word(int fpu) {
661 // nothing
662 }
663
664 bool os::is_allocatable(size_t bytes) {
665 return true;
666 }
667
668 ///////////////////////////////////////////////////////////////////////////////
669 // thread stack
670
671 // Minimum usable stack sizes required to get to user code. Space for
672 // HotSpot guard pages is added later.
673 size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K;
674 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
675 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
676
677 // return default stack size for thr_type
678 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
679 // default stack size (compiler thread needs larger stack)
680 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
681 return s;
682 }
683
684 #ifndef PRODUCT
685 void os::verify_stack_alignment() {
686 }
687 #endif
688
689 int os::extra_bang_size_in_bytes() {
690 // SPARC does not require the additional stack bang.
691 return 0;
692 }