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comparison src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp @ 133:435e64505015

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6693457: Open-source hotspot linux-sparc support Summary: Move os_cpu/linux_sparc from closed to open Reviewed-by: kamg
author phh
date Thu, 24 Apr 2008 15:07:57 -0400
parents
children d1605aabd0a1
comparison
equal deleted inserted replaced
122:ec73d88d5b43 133:435e64505015
1 /*
2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // do not include precompiled header file
26
27 #include "incls/_os_linux_sparc.cpp.incl"
28
29 // Linux/Sparc has rather obscure naming of registers in sigcontext
30 // different between 32 and 64 bits
31 #ifdef _LP64
32 #define SIG_PC(x) ((x)->sigc_regs.tpc)
33 #define SIG_NPC(x) ((x)->sigc_regs.tnpc)
34 #define SIG_REGS(x) ((x)->sigc_regs)
35 #else
36 #define SIG_PC(x) ((x)->si_regs.pc)
37 #define SIG_NPC(x) ((x)->si_regs.npc)
38 #define SIG_REGS(x) ((x)->si_regs)
39 #endif
40
41 // those are to reference registers in sigcontext
42 enum {
43 CON_G0 = 0,
44 CON_G1,
45 CON_G2,
46 CON_G3,
47 CON_G4,
48 CON_G5,
49 CON_G6,
50 CON_G7,
51 CON_O0,
52 CON_O1,
53 CON_O2,
54 CON_O3,
55 CON_O4,
56 CON_O5,
57 CON_O6,
58 CON_O7,
59 };
60
61 static inline void set_cont_address(sigcontext* ctx, address addr) {
62 SIG_PC(ctx) = (intptr_t)addr;
63 SIG_NPC(ctx) = (intptr_t)(addr+4);
64 }
65
66 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is
67 // currently interrupted by SIGPROF.
68 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested
69 // signal frames. Currently we don't do that on Linux, so it's the
70 // same as os::fetch_frame_from_context().
71 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
72 ucontext_t* uc,
73 intptr_t** ret_sp,
74 intptr_t** ret_fp) {
75 assert(thread != NULL, "just checking");
76 assert(ret_sp != NULL, "just checking");
77 assert(ret_fp != NULL, "just checking");
78
79 return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
80 }
81
82 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
83 intptr_t** ret_sp,
84 intptr_t** ret_fp) {
85 ucontext_t* uc = (ucontext_t*) ucVoid;
86 ExtendedPC epc;
87
88 if (uc != NULL) {
89 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
90 if (ret_sp) {
91 *ret_sp = os::Linux::ucontext_get_sp(uc);
92 }
93 if (ret_fp) {
94 *ret_fp = os::Linux::ucontext_get_fp(uc);
95 }
96 } else {
97 // construct empty ExtendedPC for return value checking
98 epc = ExtendedPC(NULL);
99 if (ret_sp) {
100 *ret_sp = (intptr_t*) NULL;
101 }
102 if (ret_fp) {
103 *ret_fp = (intptr_t*) NULL;
104 }
105 }
106
107 return epc;
108 }
109
110 frame os::fetch_frame_from_context(void* ucVoid) {
111 intptr_t* sp;
112 intptr_t* fp;
113 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
114 return frame(sp, fp, epc.pc());
115 }
116
117 frame os::get_sender_for_C_frame(frame* fr) {
118 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
119 }
120
121 frame os::current_frame() {
122 fprintf(stderr, "current_frame()");
123
124 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
125 frame myframe(sp, frame::unpatchable,
126 CAST_FROM_FN_PTR(address, os::current_frame));
127 if (os::is_first_C_frame(&myframe)) {
128 // stack is not walkable
129 return frame(NULL, frame::unpatchable, NULL);
130 } else {
131 return os::get_sender_for_C_frame(&myframe);
132 }
133 }
134
135 address os::current_stack_pointer() {
136 register void *sp __asm__ ("sp");
137 return (address)sp;
138 }
139
140 static void current_stack_region(address* bottom, size_t* size) {
141 if (os::Linux::is_initial_thread()) {
142 // initial thread needs special handling because pthread_getattr_np()
143 // may return bogus value.
144 *bottom = os::Linux::initial_thread_stack_bottom();
145 *size = os::Linux::initial_thread_stack_size();
146 } else {
147 pthread_attr_t attr;
148
149 int rslt = pthread_getattr_np(pthread_self(), &attr);
150
151 // JVM needs to know exact stack location, abort if it fails
152 if (rslt != 0) {
153 if (rslt == ENOMEM) {
154 vm_exit_out_of_memory(0, "pthread_getattr_np");
155 } else {
156 fatal1("pthread_getattr_np failed with errno = %d", rslt);
157 }
158 }
159
160 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) {
161 fatal("Can not locate current stack attributes!");
162 }
163
164 pthread_attr_destroy(&attr);
165 }
166 assert(os::current_stack_pointer() >= *bottom &&
167 os::current_stack_pointer() < *bottom + *size, "just checking");
168 }
169
170 address os::current_stack_base() {
171 address bottom;
172 size_t size;
173 current_stack_region(&bottom, &size);
174 return bottom + size;
175 }
176
177 size_t os::current_stack_size() {
178 // stack size includes normal stack and HotSpot guard pages
179 address bottom;
180 size_t size;
181 current_stack_region(&bottom, &size);
182 return size;
183 }
184
185 char* os::non_memory_address_word() {
186 // Must never look like an address returned by reserve_memory,
187 // even in its subfields (as defined by the CPU immediate fields,
188 // if the CPU splits constants across multiple instructions).
189 // On SPARC, 0 != %hi(any real address), because there is no
190 // allocation in the first 1Kb of the virtual address space.
191 return (char*) 0;
192 }
193
194 void os::initialize_thread() {}
195
196 void os::print_context(outputStream *st, void *context) {
197 if (context == NULL) return;
198
199 ucontext_t* uc = (ucontext_t*)context;
200 sigcontext* sc = (sigcontext*)context;
201 st->print_cr("Registers:");
202
203 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT
204 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT,
205 SIG_REGS(sc).u_regs[CON_O0],
206 SIG_REGS(sc).u_regs[CON_O1],
207 SIG_REGS(sc).u_regs[CON_O2],
208 SIG_REGS(sc).u_regs[CON_O3]);
209 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT
210 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT,
211 SIG_REGS(sc).u_regs[CON_O4],
212 SIG_REGS(sc).u_regs[CON_O5],
213 SIG_REGS(sc).u_regs[CON_O6],
214 SIG_REGS(sc).u_regs[CON_O7]);
215
216 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT
217 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT,
218 SIG_REGS(sc).u_regs[CON_G1],
219 SIG_REGS(sc).u_regs[CON_G2],
220 SIG_REGS(sc).u_regs[CON_G3],
221 SIG_REGS(sc).u_regs[CON_G4]);
222 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT
223 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT,
224 SIG_REGS(sc).u_regs[CON_G5],
225 SIG_REGS(sc).u_regs[CON_G6],
226 SIG_REGS(sc).u_regs[CON_G7],
227 SIG_REGS(sc).y);
228
229 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT,
230 SIG_PC(sc),
231 SIG_NPC(sc));
232 st->cr();
233 st->cr();
234
235 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
236 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
237 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
238 st->cr();
239
240 // Note: it may be unsafe to inspect memory near pc. For example, pc may
241 // point to garbage if entry point in an nmethod is corrupted. Leave
242 // this at the end, and hope for the best.
243 address pc = os::Linux::ucontext_get_pc(uc);
244 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
245 print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
246 }
247
248
249 address os::Linux::ucontext_get_pc(ucontext_t* uc) {
250 return (address) SIG_PC((sigcontext*)uc);
251 }
252
253 intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) {
254 return (intptr_t*)
255 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS);
256 }
257
258 // not used on Sparc
259 intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) {
260 ShouldNotReachHere();
261 return NULL;
262 }
263
264 // Utility functions
265
266 extern "C" void Fetch32PFI();
267 extern "C" void Fetch32Resume();
268 extern "C" void FetchNPFI();
269 extern "C" void FetchNResume();
270
271 inline static bool checkPrefetch(sigcontext* uc, address pc) {
272 if (pc == (address) Fetch32PFI) {
273 set_cont_address(uc, address(Fetch32Resume));
274 return true;
275 }
276 if (pc == (address) FetchNPFI) {
277 set_cont_address(uc, address(FetchNResume));
278 return true;
279 }
280 return false;
281 }
282
283 inline static bool checkOverflow(sigcontext* uc,
284 address pc,
285 address addr,
286 JavaThread* thread,
287 address* stub) {
288 // check if fault address is within thread stack
289 if (addr < thread->stack_base() &&
290 addr >= thread->stack_base() - thread->stack_size()) {
291 // stack overflow
292 if (thread->in_stack_yellow_zone(addr)) {
293 thread->disable_stack_yellow_zone();
294 if (thread->thread_state() == _thread_in_Java) {
295 // Throw a stack overflow exception. Guard pages will be reenabled
296 // while unwinding the stack.
297 *stub =
298 SharedRuntime::continuation_for_implicit_exception(thread,
299 pc,
300 SharedRuntime::STACK_OVERFLOW);
301 } else {
302 // Thread was in the vm or native code. Return and try to finish.
303 return true;
304 }
305 } else if (thread->in_stack_red_zone(addr)) {
306 // Fatal red zone violation. Disable the guard pages and fall through
307 // to handle_unexpected_exception way down below.
308 thread->disable_stack_red_zone();
309 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
310 } else {
311 // Accessing stack address below sp may cause SEGV if current
312 // thread has MAP_GROWSDOWN stack. This should only happen when
313 // current thread was created by user code with MAP_GROWSDOWN flag
314 // and then attached to VM. See notes in os_linux.cpp.
315 if (thread->osthread()->expanding_stack() == 0) {
316 thread->osthread()->set_expanding_stack();
317 if (os::Linux::manually_expand_stack(thread, addr)) {
318 thread->osthread()->clear_expanding_stack();
319 return true;
320 }
321 thread->osthread()->clear_expanding_stack();
322 } else {
323 fatal("recursive segv. expanding stack.");
324 }
325 }
326 }
327 return false;
328 }
329
330 inline static bool checkPollingPage(address pc, address fault, address* stub) {
331 if (fault == os::get_polling_page()) {
332 *stub = SharedRuntime::get_poll_stub(pc);
333 return true;
334 }
335 return false;
336 }
337
338 inline static bool checkByteBuffer(address pc, address* stub) {
339 // BugId 4454115: A read from a MappedByteBuffer can fault
340 // here if the underlying file has been truncated.
341 // Do not crash the VM in such a case.
342 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
343 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
344 if (nm != NULL && nm->has_unsafe_access()) {
345 *stub = StubRoutines::handler_for_unsafe_access();
346 return true;
347 }
348 return false;
349 }
350
351 inline static bool checkVerifyOops(address pc, address fault, address* stub) {
352 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0]
353 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) {
354 *stub = MacroAssembler::_verify_oop_implicit_branch[2];
355 warning("fixed up memory fault in +VerifyOops at address "
356 INTPTR_FORMAT, fault);
357 return true;
358 }
359 return false;
360 }
361
362 inline static bool checkFPFault(address pc, int code,
363 JavaThread* thread, address* stub) {
364 if (code == FPE_INTDIV || code == FPE_FLTDIV) {
365 *stub =
366 SharedRuntime::
367 continuation_for_implicit_exception(thread,
368 pc,
369 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
370 return true;
371 }
372 return false;
373 }
374
375 inline static bool checkNullPointer(address pc, intptr_t fault,
376 JavaThread* thread, address* stub) {
377 if (!MacroAssembler::needs_explicit_null_check(fault)) {
378 // Determination of interpreter/vtable stub/compiled code null
379 // exception
380 *stub =
381 SharedRuntime::
382 continuation_for_implicit_exception(thread, pc,
383 SharedRuntime::IMPLICIT_NULL);
384 return true;
385 }
386 return false;
387 }
388
389 inline static bool checkFastJNIAccess(address pc, address* stub) {
390 address addr = JNI_FastGetField::find_slowcase_pc(pc);
391 if (addr != (address)-1) {
392 *stub = addr;
393 return true;
394 }
395 return false;
396 }
397
398 inline static bool checkSerializePage(JavaThread* thread, address addr) {
399 return os::is_memory_serialize_page(thread, addr);
400 }
401
402 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) {
403 if (nativeInstruction_at(*pc)->is_zombie()) {
404 // zombie method (ld [%g0],%o7 instruction)
405 *stub = SharedRuntime::get_handle_wrong_method_stub();
406
407 // At the stub it needs to look like a call from the caller of this
408 // method (not a call from the segv site).
409 *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
410 return true;
411 }
412 return false;
413 }
414
415 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) {
416 #ifdef COMPILER2
417 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) {
418 #ifdef ASSERT
419 #ifdef TIERED
420 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
421 assert(cb->is_compiled_by_c2(), "Wrong compiler");
422 #endif // TIERED
423 #endif // ASSERT
424 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken.
425 *stub = SharedRuntime::get_ic_miss_stub();
426 // At the stub it needs to look like a call from the caller of this
427 // method (not a call from the segv site).
428 *pc = (address)SIG_REGS(uc).u_regs[CON_O7];
429 return true;
430 }
431 #endif // COMPILER2
432 return false;
433 }
434
435 extern "C" int
436 JVM_handle_linux_signal(int sig,
437 siginfo_t* info,
438 void* ucVoid,
439 int abort_if_unrecognized) {
440 // in fact this isn't ucontext_t* at all, but struct sigcontext*
441 // but Linux porting layer uses ucontext_t, so to minimize code change
442 // we cast as needed
443 ucontext_t* ucFake = (ucontext_t*) ucVoid;
444 sigcontext* uc = (sigcontext*)ucVoid;
445
446 Thread* t = ThreadLocalStorage::get_thread_slow();
447
448 SignalHandlerMark shm(t);
449
450 // Note: it's not uncommon that JNI code uses signal/sigset to install
451 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
452 // or have a SIGILL handler when detecting CPU type). When that happens,
453 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
454 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
455 // that do not require siginfo/ucontext first.
456
457 if (sig == SIGPIPE || sig == SIGXFSZ) {
458 // allow chained handler to go first
459 if (os::Linux::chained_handler(sig, info, ucVoid)) {
460 return true;
461 } else {
462 if (PrintMiscellaneous && (WizardMode || Verbose)) {
463 char buf[64];
464 warning("Ignoring %s - see bugs 4229104 or 646499219",
465 os::exception_name(sig, buf, sizeof(buf)));
466 }
467 return true;
468 }
469 }
470
471 JavaThread* thread = NULL;
472 VMThread* vmthread = NULL;
473 if (os::Linux::signal_handlers_are_installed) {
474 if (t != NULL ){
475 if(t->is_Java_thread()) {
476 thread = (JavaThread*)t;
477 }
478 else if(t->is_VM_thread()){
479 vmthread = (VMThread *)t;
480 }
481 }
482 }
483
484 // decide if this trap can be handled by a stub
485 address stub = NULL;
486 address pc = NULL;
487 address npc = NULL;
488
489 //%note os_trap_1
490 if (info != NULL && uc != NULL && thread != NULL) {
491 pc = address(SIG_PC(uc));
492 npc = address(SIG_NPC(uc));
493
494 // Check to see if we caught the safepoint code in the
495 // process of write protecting the memory serialization page.
496 // It write enables the page immediately after protecting it
497 // so we can just return to retry the write.
498 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) {
499 // Block current thread until the memory serialize page permission restored.
500 os::block_on_serialize_page_trap();
501 return 1;
502 }
503
504 if (checkPrefetch(uc, pc)) {
505 return 1;
506 }
507
508 // Handle ALL stack overflow variations here
509 if (sig == SIGSEGV) {
510 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) {
511 return 1;
512 }
513 }
514
515 if (sig == SIGBUS &&
516 thread->thread_state() == _thread_in_vm &&
517 thread->doing_unsafe_access()) {
518 stub = StubRoutines::handler_for_unsafe_access();
519 }
520
521 if (thread->thread_state() == _thread_in_Java) {
522 do {
523 // Java thread running in Java code => find exception handler if any
524 // a fault inside compiled code, the interpreter, or a stub
525
526 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) {
527 break;
528 }
529
530 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) {
531 break;
532 }
533
534 if ((sig == SIGSEGV || sig == SIGBUS) &&
535 checkVerifyOops(pc, (address)info->si_addr, &stub)) {
536 break;
537 }
538
539 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) {
540 break;
541 }
542
543 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) {
544 break;
545 }
546
547 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) {
548 break;
549 }
550
551 if ((sig == SIGSEGV) &&
552 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) {
553 break;
554 }
555 } while (0);
556
557 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
558 // and the heap gets shrunk before the field access.
559 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
560 checkFastJNIAccess(pc, &stub);
561 }
562 }
563
564 if (stub != NULL) {
565 // save all thread context in case we need to restore it
566 thread->set_saved_exception_pc(pc);
567 thread->set_saved_exception_npc(npc);
568 set_cont_address(uc, stub);
569 return true;
570 }
571 }
572
573 // signal-chaining
574 if (os::Linux::chained_handler(sig, info, ucVoid)) {
575 return true;
576 }
577
578 if (!abort_if_unrecognized) {
579 // caller wants another chance, so give it to him
580 return false;
581 }
582
583 if (pc == NULL && uc != NULL) {
584 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc);
585 }
586
587 // unmask current signal
588 sigset_t newset;
589 sigemptyset(&newset);
590 sigaddset(&newset, sig);
591 sigprocmask(SIG_UNBLOCK, &newset, NULL);
592
593 VMError err(t, sig, pc, info, ucVoid);
594 err.report_and_die();
595
596 ShouldNotReachHere();
597 }
598
599 void os::Linux::init_thread_fpu_state(void) {
600 // Nothing to do
601 }
602
603 int os::Linux::get_fpu_control_word() {
604 return 0;
605 }
606
607 void os::Linux::set_fpu_control_word(int fpu) {
608 // nothing
609 }
610
611 bool os::is_allocatable(size_t bytes) {
612 #ifdef _LP64
613 return true;
614 #else
615 if (bytes < 2 * G) {
616 return true;
617 }
618
619 char* addr = reserve_memory(bytes, NULL);
620
621 if (addr != NULL) {
622 release_memory(addr, bytes);
623 }
624
625 return addr != NULL;
626 #endif // _LP64
627 }
628
629 ///////////////////////////////////////////////////////////////////////////////
630 // thread stack
631
632 size_t os::Linux::min_stack_allowed = 128 * K;
633
634 // pthread on Ubuntu is always in floating stack mode
635 bool os::Linux::supports_variable_stack_size() { return true; }
636
637 // return default stack size for thr_type
638 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
639 // default stack size (compiler thread needs larger stack)
640 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
641 return s;
642 }
643
644 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
645 // Creating guard page is very expensive. Java thread has HotSpot
646 // guard page, only enable glibc guard page for non-Java threads.
647 return (thr_type == java_thread ? 0 : page_size());
648 }