1 /*
2 * Copyright (c) 1999, 2018, 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::print_context(outputStream *st, const void *context) {
163 if (context == NULL) return;
164
165 const ucontext_t* uc = (const ucontext_t*)context;
166 sigcontext* sc = (sigcontext*)context;
167 st->print_cr("Registers:");
168
169 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT
170 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT,
171 SIG_REGS(sc).u_regs[CON_G1],
172 SIG_REGS(sc).u_regs[CON_G2],
173 SIG_REGS(sc).u_regs[CON_G3],
174 SIG_REGS(sc).u_regs[CON_G4]);
175 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT
176 " G7=" INTPTR_FORMAT " Y=0x%x",
177 SIG_REGS(sc).u_regs[CON_G5],
178 SIG_REGS(sc).u_regs[CON_G6],
179 SIG_REGS(sc).u_regs[CON_G7],
180 SIG_REGS(sc).y);
181 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT
182 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT,
183 SIG_REGS(sc).u_regs[CON_O0],
184 SIG_REGS(sc).u_regs[CON_O1],
185 SIG_REGS(sc).u_regs[CON_O2],
186 SIG_REGS(sc).u_regs[CON_O3]);
187 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT
188 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT,
189 SIG_REGS(sc).u_regs[CON_O4],
190 SIG_REGS(sc).u_regs[CON_O5],
191 SIG_REGS(sc).u_regs[CON_O6],
192 SIG_REGS(sc).u_regs[CON_O7]);
193
194
195 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
196 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT
197 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT,
198 sp[L0->sp_offset_in_saved_window()],
199 sp[L1->sp_offset_in_saved_window()],
200 sp[L2->sp_offset_in_saved_window()],
201 sp[L3->sp_offset_in_saved_window()]);
202 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT
203 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT,
204 sp[L4->sp_offset_in_saved_window()],
205 sp[L5->sp_offset_in_saved_window()],
206 sp[L6->sp_offset_in_saved_window()],
207 sp[L7->sp_offset_in_saved_window()]);
208 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT
209 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT,
210 sp[I0->sp_offset_in_saved_window()],
211 sp[I1->sp_offset_in_saved_window()],
212 sp[I2->sp_offset_in_saved_window()],
213 sp[I3->sp_offset_in_saved_window()]);
214 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT
215 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT,
216 sp[I4->sp_offset_in_saved_window()],
217 sp[I5->sp_offset_in_saved_window()],
218 sp[I6->sp_offset_in_saved_window()],
219 sp[I7->sp_offset_in_saved_window()]);
220
221 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT,
222 SIG_PC(sc),
223 SIG_NPC(sc));
224 st->cr();
225 st->cr();
226
227 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp));
228 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
229 st->cr();
230
231 // Note: it may be unsafe to inspect memory near pc. For example, pc may
232 // point to garbage if entry point in an nmethod is corrupted. Leave
233 // this at the end, and hope for the best.
234 address pc = os::Linux::ucontext_get_pc(uc);
235 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc));
236 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
237 }
238
239
240 void os::print_register_info(outputStream *st, const void *context) {
241 if (context == NULL) return;
242
243 const ucontext_t *uc = (const ucontext_t*)context;
244 const sigcontext* sc = (const sigcontext*)context;
245 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
246
247 st->print_cr("Register to memory mapping:");
248 st->cr();
249
250 // this is only for the "general purpose" registers
251 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]);
252 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]);
253 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]);
254 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]);
255 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]);
256 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]);
257 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]);
258 st->cr();
259
260 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]);
261 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]);
262 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]);
263 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]);
264 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]);
265 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]);
266 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]);
267 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]);
268 st->cr();
269
270 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]);
271 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]);
272 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]);
273 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]);
274 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]);
275 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]);
276 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]);
277 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]);
278 st->cr();
279
280 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]);
281 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]);
282 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]);
283 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]);
284 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]);
285 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]);
286 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]);
287 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]);
288 st->cr();
289 }
290
291
292 address os::Linux::ucontext_get_pc(const ucontext_t* uc) {
293 return (address) SIG_PC((sigcontext*)uc);
294 }
295
296 void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) {
297 sigcontext* ctx = (sigcontext*) uc;
298 SIG_PC(ctx) = (intptr_t)pc;
299 SIG_NPC(ctx) = (intptr_t)(pc+4);
300 }
301
302 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) {
303 return (intptr_t*)
304 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS);
305 }
306
307 // not used on Sparc
308 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) {
309 ShouldNotReachHere();
310 return NULL;
311 }
312
313 // Utility functions
314
315 inline static bool checkPrefetch(sigcontext* uc, address pc) {
316 if (StubRoutines::is_safefetch_fault(pc)) {
317 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc));
318 return true;
319 }
320 return false;
321 }
322
323 inline static bool checkOverflow(sigcontext* uc,
324 address pc,
325 address addr,
326 JavaThread* thread,
327 address* stub) {
328 // check if fault address is within thread stack
329 if (thread->on_local_stack(addr)) {
330 // stack overflow
331 if (thread->in_stack_yellow_reserved_zone(addr)) {
332 thread->disable_stack_yellow_reserved_zone();
333 if (thread->thread_state() == _thread_in_Java) {
334 // Throw a stack overflow exception. Guard pages will be reenabled
335 // while unwinding the stack.
336 *stub =
337 SharedRuntime::continuation_for_implicit_exception(thread,
338 pc,
339 SharedRuntime::STACK_OVERFLOW);
340 } else {
341 // Thread was in the vm or native code. Return and try to finish.
342 return true;
343 }
344 } else if (thread->in_stack_red_zone(addr)) {
345 // Fatal red zone violation. Disable the guard pages and fall through
346 // to handle_unexpected_exception way down below.
347 thread->disable_stack_red_zone();
348 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
349
350 // This is a likely cause, but hard to verify. Let's just print
351 // it as a hint.
352 tty->print_raw_cr("Please check if any of your loaded .so files has "
353 "enabled executable stack (see man page execstack(8))");
354 } else {
355 // Accessing stack address below sp may cause SEGV if current
356 // thread has MAP_GROWSDOWN stack. This should only happen when
357 // current thread was created by user code with MAP_GROWSDOWN flag
358 // and then attached to VM. See notes in os_linux.cpp.
359 if (thread->osthread()->expanding_stack() == 0) {
360 thread->osthread()->set_expanding_stack();
361 if (os::Linux::manually_expand_stack(thread, addr)) {
362 thread->osthread()->clear_expanding_stack();
363 return true;
364 }
365 thread->osthread()->clear_expanding_stack();
366 } else {
367 fatal("recursive segv. expanding stack.");
368 }
369 }
370 }
371 return false;
372 }
373
374 inline static bool checkPollingPage(address pc, address fault, address* stub) {
375 if (os::is_poll_address(fault)) {
376 *stub = SharedRuntime::get_poll_stub(pc);
377 return true;
378 }
379 return false;
380 }
381
382 inline static bool checkByteBuffer(address pc, address npc, JavaThread * thread, address* stub) {
383 // BugId 4454115: A read from a MappedByteBuffer can fault
384 // here if the underlying file has been truncated.
385 // Do not crash the VM in such a case.
386 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
387 CompiledMethod* nm = cb->as_compiled_method_or_null();
388 if (nm != NULL && nm->has_unsafe_access()) {
389 *stub = SharedRuntime::handle_unsafe_access(thread, npc);
390 return true;
391 }
392 return false;
393 }
394
395 inline static bool checkVerifyOops(address pc, address fault, address* stub) {
396 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0]
397 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) {
398 *stub = MacroAssembler::_verify_oop_implicit_branch[2];
399 warning("fixed up memory fault in +VerifyOops at address "
400 INTPTR_FORMAT, p2i(fault));
401 return true;
402 }
403 return false;
404 }
405
406 inline static bool checkFPFault(address pc, int code,
407 JavaThread* thread, address* stub) {
408 if (code == FPE_INTDIV || code == FPE_FLTDIV) {
409 *stub =
410 SharedRuntime::
411 continuation_for_implicit_exception(thread,
412 pc,
413 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
414 return true;
415 }
416 return false;
417 }
418
419 inline static bool checkNullPointer(address pc, intptr_t fault,
420 JavaThread* thread, address* stub) {
421 if (!MacroAssembler::needs_explicit_null_check(fault)) {
422 // Determination of interpreter/vtable stub/compiled code null
423 // exception
424 *stub =
425 SharedRuntime::
426 continuation_for_implicit_exception(thread, pc,
427 SharedRuntime::IMPLICIT_NULL);
428 return true;
429 }
430 return false;
431 }
432
433 inline static bool checkFastJNIAccess(address pc, address* stub) {
434 address addr = JNI_FastGetField::find_slowcase_pc(pc);
435 if (addr != (address)-1) {
436 *stub = addr;
437 return true;
438 }
439 return false;
440 }
441
442 inline static bool checkSerializePage(JavaThread* thread, address addr) {
443 return os::is_memory_serialize_page(thread, addr);
444 }
445
446 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) {
447 if (nativeInstruction_at(*pc)->is_zombie()) {
448 // zombie method (ld [%g0],%o7 instruction)
449 *stub = SharedRuntime::get_handle_wrong_method_stub();
450
451 // At the stub it needs to look like a call from the caller of this
452 // method (not a call from the segv site).
453 *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
454 return true;
455 }
456 return false;
457 }
458
459 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) {
460 #ifdef COMPILER2
461 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) {
462 #ifdef ASSERT
463 #ifdef TIERED
464 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc);
465 assert(cb->is_compiled_by_c2(), "Wrong compiler");
466 #endif // TIERED
467 #endif // ASSERT
468 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken.
469 *stub = SharedRuntime::get_ic_miss_stub();
470 // At the stub it needs to look like a call from the caller of this
471 // method (not a call from the segv site).
472 *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
473 return true;
474 }
475 #endif // COMPILER2
476 return false;
477 }
478
479 extern "C" JNIEXPORT int
480 JVM_handle_linux_signal(int sig,
481 siginfo_t* info,
482 void* ucVoid,
483 int abort_if_unrecognized) {
484 // in fact this isn't ucontext_t* at all, but struct sigcontext*
485 // but Linux porting layer uses ucontext_t, so to minimize code change
486 // we cast as needed
487 ucontext_t* ucFake = (ucontext_t*) ucVoid;
488 sigcontext* uc = (sigcontext*)ucVoid;
489
490 Thread* t = Thread::current_or_null_safe();
491
492 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
493 // (no destructors can be run)
494 os::ThreadCrashProtection::check_crash_protection(sig, t);
495
496 SignalHandlerMark shm(t);
497
498 // Note: it's not uncommon that JNI code uses signal/sigset to install
499 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
500 // or have a SIGILL handler when detecting CPU type). When that happens,
501 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
502 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
503 // that do not require siginfo/ucontext first.
504
505 if (sig == SIGPIPE || sig == SIGXFSZ) {
506 // allow chained handler to go first
507 if (os::Linux::chained_handler(sig, info, ucVoid)) {
508 return true;
509 } else {
510 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
511 return true;
512 }
513 }
514
515 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
516 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) {
517 handle_assert_poison_fault(ucVoid, info->si_addr);
518 return 1;
519 }
520 #endif
521
522 JavaThread* thread = NULL;
523 VMThread* vmthread = NULL;
524 if (os::Linux::signal_handlers_are_installed) {
525 if (t != NULL ){
526 if(t->is_Java_thread()) {
527 thread = (JavaThread*)t;
528 }
529 else if(t->is_VM_thread()){
530 vmthread = (VMThread *)t;
531 }
532 }
533 }
534
535 // decide if this trap can be handled by a stub
536 address stub = NULL;
537 address pc = NULL;
538 address npc = NULL;
539
540 //%note os_trap_1
541 if (info != NULL && uc != NULL && thread != NULL) {
542 pc = address(SIG_PC(uc));
543 npc = address(SIG_NPC(uc));
544
545 // Check to see if we caught the safepoint code in the
546 // process of write protecting the memory serialization page.
547 // It write enables the page immediately after protecting it
548 // so we can just return to retry the write.
549 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) {
550 // Block current thread until the memory serialize page permission restored.
551 os::block_on_serialize_page_trap();
552 return 1;
553 }
554
555 if (checkPrefetch(uc, pc)) {
556 return 1;
557 }
558
559 // Handle ALL stack overflow variations here
560 if (sig == SIGSEGV) {
561 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) {
562 return 1;
563 }
564 }
565
566 if (sig == SIGBUS &&
567 thread->thread_state() == _thread_in_vm &&
568 thread->doing_unsafe_access()) {
569 stub = SharedRuntime::handle_unsafe_access(thread, npc);
570 }
571
572 if (thread->thread_state() == _thread_in_Java) {
573 do {
574 // Java thread running in Java code => find exception handler if any
575 // a fault inside compiled code, the interpreter, or a stub
576
577 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) {
578 break;
579 }
580
581 if ((sig == SIGBUS) && checkByteBuffer(pc, npc, thread, &stub)) {
582 break;
583 }
584
585 if ((sig == SIGSEGV || sig == SIGBUS) &&
586 checkVerifyOops(pc, (address)info->si_addr, &stub)) {
587 break;
588 }
589
590 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) {
591 break;
592 }
593
594 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) {
595 break;
596 }
597
598 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) {
599 break;
600 }
601
602 if ((sig == SIGSEGV) &&
603 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) {
604 break;
605 }
606 } while (0);
607
608 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
609 // and the heap gets shrunk before the field access.
610 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
611 checkFastJNIAccess(pc, &stub);
612 }
613 }
614
615 if (stub != NULL) {
616 // save all thread context in case we need to restore it
617 thread->set_saved_exception_pc(pc);
618 thread->set_saved_exception_npc(npc);
619 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub);
620 return true;
621 }
622 }
623
624 // signal-chaining
625 if (os::Linux::chained_handler(sig, info, ucVoid)) {
626 return true;
627 }
628
629 if (!abort_if_unrecognized) {
630 // caller wants another chance, so give it to him
631 return false;
632 }
633
634 if (pc == NULL && uc != NULL) {
635 pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc);
636 }
637
638 // unmask current signal
639 sigset_t newset;
640 sigemptyset(&newset);
641 sigaddset(&newset, sig);
642 sigprocmask(SIG_UNBLOCK, &newset, NULL);
643
644 VMError::report_and_die(t, sig, pc, info, ucVoid);
645
646 ShouldNotReachHere();
647 return false;
648 }
649
650 void os::Linux::init_thread_fpu_state(void) {
651 // Nothing to do
652 }
653
654 int os::Linux::get_fpu_control_word() {
655 return 0;
656 }
657
658 void os::Linux::set_fpu_control_word(int fpu) {
659 // nothing
660 }
661
662 bool os::is_allocatable(size_t bytes) {
663 return true;
664 }
665
666 ///////////////////////////////////////////////////////////////////////////////
667 // thread stack
668
669 // Minimum usable stack sizes required to get to user code. Space for
670 // HotSpot guard pages is added later.
671 size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K;
672 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
673 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
674
675 // return default stack size for thr_type
676 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
677 // default stack size (compiler thread needs larger stack)
678 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
679 return s;
680 }
681
682 #ifndef PRODUCT
683 void os::verify_stack_alignment() {
684 }
685 #endif
686
687 int os::extra_bang_size_in_bytes() {
688 // SPARC does not require the additional stack bang.
689 return 0;
690 }