Mercurial > hg > truffle
annotate src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp @ 4617:113d66f7454d
Add merge-before-loopend simplification for merges
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 16 Feb 2012 14:43:05 +0100 |
parents | 1d1603768966 |
children | da4be62fb889 |
rev | line source |
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133 | 1 /* |
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2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. |
133 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
133 | 22 * |
23 */ | |
24 | |
1972 | 25 // no precompiled headers |
26 #include "assembler_sparc.inline.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_linux.h" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "mutex_linux.inline.hpp" | |
36 #include "nativeInst_sparc.hpp" | |
37 #include "os_share_linux.hpp" | |
38 #include "prims/jniFastGetField.hpp" | |
39 #include "prims/jvm.h" | |
40 #include "prims/jvm_misc.hpp" | |
41 #include "runtime/arguments.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/timer.hpp" | |
52 #include "thread_linux.inline.hpp" | |
53 #include "utilities/events.hpp" | |
54 #include "utilities/vmError.hpp" | |
55 #ifdef COMPILER1 | |
56 #include "c1/c1_Runtime1.hpp" | |
57 #endif | |
58 #ifdef COMPILER2 | |
59 #include "opto/runtime.hpp" | |
60 #endif | |
133 | 61 |
62 | |
63 // Linux/Sparc has rather obscure naming of registers in sigcontext | |
64 // different between 32 and 64 bits | |
65 #ifdef _LP64 | |
66 #define SIG_PC(x) ((x)->sigc_regs.tpc) | |
67 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) | |
68 #define SIG_REGS(x) ((x)->sigc_regs) | |
69 #else | |
70 #define SIG_PC(x) ((x)->si_regs.pc) | |
71 #define SIG_NPC(x) ((x)->si_regs.npc) | |
72 #define SIG_REGS(x) ((x)->si_regs) | |
73 #endif | |
74 | |
75 // those are to reference registers in sigcontext | |
76 enum { | |
77 CON_G0 = 0, | |
78 CON_G1, | |
79 CON_G2, | |
80 CON_G3, | |
81 CON_G4, | |
82 CON_G5, | |
83 CON_G6, | |
84 CON_G7, | |
85 CON_O0, | |
86 CON_O1, | |
87 CON_O2, | |
88 CON_O3, | |
89 CON_O4, | |
90 CON_O5, | |
91 CON_O6, | |
92 CON_O7, | |
93 }; | |
94 | |
95 static inline void set_cont_address(sigcontext* ctx, address addr) { | |
96 SIG_PC(ctx) = (intptr_t)addr; | |
97 SIG_NPC(ctx) = (intptr_t)(addr+4); | |
98 } | |
99 | |
100 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
101 // currently interrupted by SIGPROF. | |
102 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested | |
103 // signal frames. Currently we don't do that on Linux, so it's the | |
104 // same as os::fetch_frame_from_context(). | |
105 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
106 ucontext_t* uc, | |
107 intptr_t** ret_sp, | |
108 intptr_t** ret_fp) { | |
109 assert(thread != NULL, "just checking"); | |
110 assert(ret_sp != NULL, "just checking"); | |
111 assert(ret_fp != NULL, "just checking"); | |
112 | |
113 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
114 } | |
115 | |
116 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
117 intptr_t** ret_sp, | |
118 intptr_t** ret_fp) { | |
119 ucontext_t* uc = (ucontext_t*) ucVoid; | |
120 ExtendedPC epc; | |
121 | |
122 if (uc != NULL) { | |
123 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
124 if (ret_sp) { | |
125 *ret_sp = os::Linux::ucontext_get_sp(uc); | |
126 } | |
127 if (ret_fp) { | |
128 *ret_fp = os::Linux::ucontext_get_fp(uc); | |
129 } | |
130 } else { | |
131 // construct empty ExtendedPC for return value checking | |
132 epc = ExtendedPC(NULL); | |
133 if (ret_sp) { | |
134 *ret_sp = (intptr_t*) NULL; | |
135 } | |
136 if (ret_fp) { | |
137 *ret_fp = (intptr_t*) NULL; | |
138 } | |
139 } | |
140 | |
141 return epc; | |
142 } | |
143 | |
144 frame os::fetch_frame_from_context(void* ucVoid) { | |
145 intptr_t* sp; | |
146 intptr_t* fp; | |
147 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
148 return frame(sp, fp, epc.pc()); | |
149 } | |
150 | |
151 frame os::get_sender_for_C_frame(frame* fr) { | |
152 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
153 } | |
154 | |
155 frame os::current_frame() { | |
156 fprintf(stderr, "current_frame()"); | |
157 | |
158 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
159 frame myframe(sp, frame::unpatchable, | |
160 CAST_FROM_FN_PTR(address, os::current_frame)); | |
161 if (os::is_first_C_frame(&myframe)) { | |
162 // stack is not walkable | |
163 return frame(NULL, frame::unpatchable, NULL); | |
164 } else { | |
165 return os::get_sender_for_C_frame(&myframe); | |
166 } | |
167 } | |
168 | |
169 address os::current_stack_pointer() { | |
170 register void *sp __asm__ ("sp"); | |
171 return (address)sp; | |
172 } | |
173 | |
174 static void current_stack_region(address* bottom, size_t* size) { | |
175 if (os::Linux::is_initial_thread()) { | |
176 // initial thread needs special handling because pthread_getattr_np() | |
177 // may return bogus value. | |
178 *bottom = os::Linux::initial_thread_stack_bottom(); | |
179 *size = os::Linux::initial_thread_stack_size(); | |
180 } else { | |
181 pthread_attr_t attr; | |
182 | |
183 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
184 | |
185 // JVM needs to know exact stack location, abort if it fails | |
186 if (rslt != 0) { | |
187 if (rslt == ENOMEM) { | |
188 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
189 } else { | |
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190 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
133 | 191 } |
192 } | |
193 | |
194 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { | |
195 fatal("Can not locate current stack attributes!"); | |
196 } | |
197 | |
198 pthread_attr_destroy(&attr); | |
199 } | |
200 assert(os::current_stack_pointer() >= *bottom && | |
201 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
202 } | |
203 | |
204 address os::current_stack_base() { | |
205 address bottom; | |
206 size_t size; | |
207 current_stack_region(&bottom, &size); | |
208 return bottom + size; | |
209 } | |
210 | |
211 size_t os::current_stack_size() { | |
212 // stack size includes normal stack and HotSpot guard pages | |
213 address bottom; | |
214 size_t size; | |
215 current_stack_region(&bottom, &size); | |
216 return size; | |
217 } | |
218 | |
219 char* os::non_memory_address_word() { | |
220 // Must never look like an address returned by reserve_memory, | |
221 // even in its subfields (as defined by the CPU immediate fields, | |
222 // if the CPU splits constants across multiple instructions). | |
223 // On SPARC, 0 != %hi(any real address), because there is no | |
224 // allocation in the first 1Kb of the virtual address space. | |
225 return (char*) 0; | |
226 } | |
227 | |
228 void os::initialize_thread() {} | |
229 | |
230 void os::print_context(outputStream *st, void *context) { | |
231 if (context == NULL) return; | |
232 | |
233 ucontext_t* uc = (ucontext_t*)context; | |
234 sigcontext* sc = (sigcontext*)context; | |
235 st->print_cr("Registers:"); | |
236 | |
1907 | 237 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT |
238 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, | |
239 SIG_REGS(sc).u_regs[CON_G1], | |
240 SIG_REGS(sc).u_regs[CON_G2], | |
241 SIG_REGS(sc).u_regs[CON_G3], | |
242 SIG_REGS(sc).u_regs[CON_G4]); | |
243 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT | |
244 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, | |
245 SIG_REGS(sc).u_regs[CON_G5], | |
246 SIG_REGS(sc).u_regs[CON_G6], | |
247 SIG_REGS(sc).u_regs[CON_G7], | |
248 SIG_REGS(sc).y); | |
133 | 249 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT |
250 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, | |
251 SIG_REGS(sc).u_regs[CON_O0], | |
252 SIG_REGS(sc).u_regs[CON_O1], | |
253 SIG_REGS(sc).u_regs[CON_O2], | |
254 SIG_REGS(sc).u_regs[CON_O3]); | |
255 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT | |
256 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, | |
257 SIG_REGS(sc).u_regs[CON_O4], | |
258 SIG_REGS(sc).u_regs[CON_O5], | |
259 SIG_REGS(sc).u_regs[CON_O6], | |
260 SIG_REGS(sc).u_regs[CON_O7]); | |
261 | |
1907 | 262 |
263 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
264 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT | |
265 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, | |
266 sp[L0->sp_offset_in_saved_window()], | |
267 sp[L1->sp_offset_in_saved_window()], | |
268 sp[L2->sp_offset_in_saved_window()], | |
269 sp[L3->sp_offset_in_saved_window()]); | |
270 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT | |
271 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, | |
272 sp[L4->sp_offset_in_saved_window()], | |
273 sp[L5->sp_offset_in_saved_window()], | |
274 sp[L6->sp_offset_in_saved_window()], | |
275 sp[L7->sp_offset_in_saved_window()]); | |
276 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT | |
277 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, | |
278 sp[I0->sp_offset_in_saved_window()], | |
279 sp[I1->sp_offset_in_saved_window()], | |
280 sp[I2->sp_offset_in_saved_window()], | |
281 sp[I3->sp_offset_in_saved_window()]); | |
282 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT | |
283 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, | |
284 sp[I4->sp_offset_in_saved_window()], | |
285 sp[I5->sp_offset_in_saved_window()], | |
286 sp[I6->sp_offset_in_saved_window()], | |
287 sp[I7->sp_offset_in_saved_window()]); | |
133 | 288 |
289 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, | |
290 SIG_PC(sc), | |
291 SIG_NPC(sc)); | |
292 st->cr(); | |
293 st->cr(); | |
294 | |
295 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
296 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
297 st->cr(); | |
298 | |
299 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
300 // point to garbage if entry point in an nmethod is corrupted. Leave | |
301 // this at the end, and hope for the best. | |
302 address pc = os::Linux::ucontext_get_pc(uc); | |
303 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
1907 | 304 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
305 } | |
306 | |
307 | |
308 void os::print_register_info(outputStream *st, void *context) { | |
309 if (context == NULL) return; | |
310 | |
311 ucontext_t *uc = (ucontext_t*)context; | |
312 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
313 | |
314 st->print_cr("Register to memory mapping:"); | |
315 st->cr(); | |
316 | |
317 // this is only for the "general purpose" registers | |
318 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON__G1]); | |
319 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON__G2]); | |
320 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON__G3]); | |
321 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON__G4]); | |
322 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON__G5]); | |
323 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON__G6]); | |
324 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON__G7]); | |
325 st->cr(); | |
326 | |
327 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON__O0]); | |
328 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON__O1]); | |
329 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON__O2]); | |
330 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON__O3]); | |
331 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON__O4]); | |
332 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON__O5]); | |
333 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON__O6]); | |
334 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON__O7]); | |
335 st->cr(); | |
336 | |
337 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); | |
338 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); | |
339 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); | |
340 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); | |
341 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); | |
342 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); | |
343 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); | |
344 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); | |
345 st->cr(); | |
346 | |
347 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); | |
348 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); | |
349 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); | |
350 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); | |
351 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); | |
352 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); | |
353 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); | |
354 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); | |
355 st->cr(); | |
133 | 356 } |
357 | |
358 | |
359 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
360 return (address) SIG_PC((sigcontext*)uc); | |
361 } | |
362 | |
363 intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { | |
364 return (intptr_t*) | |
365 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); | |
366 } | |
367 | |
368 // not used on Sparc | |
369 intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { | |
370 ShouldNotReachHere(); | |
371 return NULL; | |
372 } | |
373 | |
374 // Utility functions | |
375 | |
376 extern "C" void Fetch32PFI(); | |
377 extern "C" void Fetch32Resume(); | |
378 extern "C" void FetchNPFI(); | |
379 extern "C" void FetchNResume(); | |
380 | |
381 inline static bool checkPrefetch(sigcontext* uc, address pc) { | |
382 if (pc == (address) Fetch32PFI) { | |
383 set_cont_address(uc, address(Fetch32Resume)); | |
384 return true; | |
385 } | |
386 if (pc == (address) FetchNPFI) { | |
387 set_cont_address(uc, address(FetchNResume)); | |
388 return true; | |
389 } | |
390 return false; | |
391 } | |
392 | |
393 inline static bool checkOverflow(sigcontext* uc, | |
394 address pc, | |
395 address addr, | |
396 JavaThread* thread, | |
397 address* stub) { | |
398 // check if fault address is within thread stack | |
399 if (addr < thread->stack_base() && | |
400 addr >= thread->stack_base() - thread->stack_size()) { | |
401 // stack overflow | |
402 if (thread->in_stack_yellow_zone(addr)) { | |
403 thread->disable_stack_yellow_zone(); | |
404 if (thread->thread_state() == _thread_in_Java) { | |
405 // Throw a stack overflow exception. Guard pages will be reenabled | |
406 // while unwinding the stack. | |
407 *stub = | |
408 SharedRuntime::continuation_for_implicit_exception(thread, | |
409 pc, | |
410 SharedRuntime::STACK_OVERFLOW); | |
411 } else { | |
412 // Thread was in the vm or native code. Return and try to finish. | |
413 return true; | |
414 } | |
415 } else if (thread->in_stack_red_zone(addr)) { | |
416 // Fatal red zone violation. Disable the guard pages and fall through | |
417 // to handle_unexpected_exception way down below. | |
418 thread->disable_stack_red_zone(); | |
419 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
420 } else { | |
421 // Accessing stack address below sp may cause SEGV if current | |
422 // thread has MAP_GROWSDOWN stack. This should only happen when | |
423 // current thread was created by user code with MAP_GROWSDOWN flag | |
424 // and then attached to VM. See notes in os_linux.cpp. | |
425 if (thread->osthread()->expanding_stack() == 0) { | |
426 thread->osthread()->set_expanding_stack(); | |
427 if (os::Linux::manually_expand_stack(thread, addr)) { | |
428 thread->osthread()->clear_expanding_stack(); | |
429 return true; | |
430 } | |
431 thread->osthread()->clear_expanding_stack(); | |
432 } else { | |
433 fatal("recursive segv. expanding stack."); | |
434 } | |
435 } | |
436 } | |
437 return false; | |
438 } | |
439 | |
440 inline static bool checkPollingPage(address pc, address fault, address* stub) { | |
441 if (fault == os::get_polling_page()) { | |
442 *stub = SharedRuntime::get_poll_stub(pc); | |
443 return true; | |
444 } | |
445 return false; | |
446 } | |
447 | |
448 inline static bool checkByteBuffer(address pc, address* stub) { | |
449 // BugId 4454115: A read from a MappedByteBuffer can fault | |
450 // here if the underlying file has been truncated. | |
451 // Do not crash the VM in such a case. | |
452 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
453 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
454 if (nm != NULL && nm->has_unsafe_access()) { | |
455 *stub = StubRoutines::handler_for_unsafe_access(); | |
456 return true; | |
457 } | |
458 return false; | |
459 } | |
460 | |
461 inline static bool checkVerifyOops(address pc, address fault, address* stub) { | |
462 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] | |
463 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { | |
464 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; | |
465 warning("fixed up memory fault in +VerifyOops at address " | |
466 INTPTR_FORMAT, fault); | |
467 return true; | |
468 } | |
469 return false; | |
470 } | |
471 | |
472 inline static bool checkFPFault(address pc, int code, | |
473 JavaThread* thread, address* stub) { | |
474 if (code == FPE_INTDIV || code == FPE_FLTDIV) { | |
475 *stub = | |
476 SharedRuntime:: | |
477 continuation_for_implicit_exception(thread, | |
478 pc, | |
479 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
480 return true; | |
481 } | |
482 return false; | |
483 } | |
484 | |
485 inline static bool checkNullPointer(address pc, intptr_t fault, | |
486 JavaThread* thread, address* stub) { | |
487 if (!MacroAssembler::needs_explicit_null_check(fault)) { | |
488 // Determination of interpreter/vtable stub/compiled code null | |
489 // exception | |
490 *stub = | |
491 SharedRuntime:: | |
492 continuation_for_implicit_exception(thread, pc, | |
493 SharedRuntime::IMPLICIT_NULL); | |
494 return true; | |
495 } | |
496 return false; | |
497 } | |
498 | |
499 inline static bool checkFastJNIAccess(address pc, address* stub) { | |
500 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
501 if (addr != (address)-1) { | |
502 *stub = addr; | |
503 return true; | |
504 } | |
505 return false; | |
506 } | |
507 | |
508 inline static bool checkSerializePage(JavaThread* thread, address addr) { | |
509 return os::is_memory_serialize_page(thread, addr); | |
510 } | |
511 | |
512 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { | |
513 if (nativeInstruction_at(*pc)->is_zombie()) { | |
514 // zombie method (ld [%g0],%o7 instruction) | |
515 *stub = SharedRuntime::get_handle_wrong_method_stub(); | |
516 | |
517 // At the stub it needs to look like a call from the caller of this | |
518 // method (not a call from the segv site). | |
519 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
520 return true; | |
521 } | |
522 return false; | |
523 } | |
524 | |
525 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { | |
526 #ifdef COMPILER2 | |
527 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { | |
528 #ifdef ASSERT | |
529 #ifdef TIERED | |
530 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
531 assert(cb->is_compiled_by_c2(), "Wrong compiler"); | |
532 #endif // TIERED | |
533 #endif // ASSERT | |
534 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. | |
535 *stub = SharedRuntime::get_ic_miss_stub(); | |
536 // At the stub it needs to look like a call from the caller of this | |
537 // method (not a call from the segv site). | |
538 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
539 return true; | |
540 } | |
541 #endif // COMPILER2 | |
542 return false; | |
543 } | |
544 | |
2191 | 545 extern "C" JNIEXPORT int |
133 | 546 JVM_handle_linux_signal(int sig, |
547 siginfo_t* info, | |
548 void* ucVoid, | |
549 int abort_if_unrecognized) { | |
550 // in fact this isn't ucontext_t* at all, but struct sigcontext* | |
551 // but Linux porting layer uses ucontext_t, so to minimize code change | |
552 // we cast as needed | |
553 ucontext_t* ucFake = (ucontext_t*) ucVoid; | |
554 sigcontext* uc = (sigcontext*)ucVoid; | |
555 | |
556 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
557 | |
558 SignalHandlerMark shm(t); | |
559 | |
560 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
561 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
562 // or have a SIGILL handler when detecting CPU type). When that happens, | |
563 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
564 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
565 // that do not require siginfo/ucontext first. | |
566 | |
567 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
568 // allow chained handler to go first | |
569 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
570 return true; | |
571 } else { | |
572 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
573 char buf[64]; | |
574 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
575 os::exception_name(sig, buf, sizeof(buf))); | |
576 } | |
577 return true; | |
578 } | |
579 } | |
580 | |
581 JavaThread* thread = NULL; | |
582 VMThread* vmthread = NULL; | |
583 if (os::Linux::signal_handlers_are_installed) { | |
584 if (t != NULL ){ | |
585 if(t->is_Java_thread()) { | |
586 thread = (JavaThread*)t; | |
587 } | |
588 else if(t->is_VM_thread()){ | |
589 vmthread = (VMThread *)t; | |
590 } | |
591 } | |
592 } | |
593 | |
594 // decide if this trap can be handled by a stub | |
595 address stub = NULL; | |
596 address pc = NULL; | |
597 address npc = NULL; | |
598 | |
599 //%note os_trap_1 | |
600 if (info != NULL && uc != NULL && thread != NULL) { | |
601 pc = address(SIG_PC(uc)); | |
602 npc = address(SIG_NPC(uc)); | |
603 | |
604 // Check to see if we caught the safepoint code in the | |
605 // process of write protecting the memory serialization page. | |
606 // It write enables the page immediately after protecting it | |
607 // so we can just return to retry the write. | |
608 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { | |
609 // Block current thread until the memory serialize page permission restored. | |
610 os::block_on_serialize_page_trap(); | |
611 return 1; | |
612 } | |
613 | |
614 if (checkPrefetch(uc, pc)) { | |
615 return 1; | |
616 } | |
617 | |
618 // Handle ALL stack overflow variations here | |
619 if (sig == SIGSEGV) { | |
620 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { | |
621 return 1; | |
622 } | |
623 } | |
624 | |
625 if (sig == SIGBUS && | |
626 thread->thread_state() == _thread_in_vm && | |
627 thread->doing_unsafe_access()) { | |
628 stub = StubRoutines::handler_for_unsafe_access(); | |
629 } | |
630 | |
631 if (thread->thread_state() == _thread_in_Java) { | |
632 do { | |
633 // Java thread running in Java code => find exception handler if any | |
634 // a fault inside compiled code, the interpreter, or a stub | |
635 | |
636 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { | |
637 break; | |
638 } | |
639 | |
640 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { | |
641 break; | |
642 } | |
643 | |
644 if ((sig == SIGSEGV || sig == SIGBUS) && | |
645 checkVerifyOops(pc, (address)info->si_addr, &stub)) { | |
646 break; | |
647 } | |
648 | |
649 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { | |
650 break; | |
651 } | |
652 | |
653 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { | |
654 break; | |
655 } | |
656 | |
657 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { | |
658 break; | |
659 } | |
660 | |
661 if ((sig == SIGSEGV) && | |
662 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { | |
663 break; | |
664 } | |
665 } while (0); | |
666 | |
667 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
668 // and the heap gets shrunk before the field access. | |
669 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
670 checkFastJNIAccess(pc, &stub); | |
671 } | |
672 } | |
673 | |
674 if (stub != NULL) { | |
675 // save all thread context in case we need to restore it | |
676 thread->set_saved_exception_pc(pc); | |
677 thread->set_saved_exception_npc(npc); | |
678 set_cont_address(uc, stub); | |
679 return true; | |
680 } | |
681 } | |
682 | |
683 // signal-chaining | |
684 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
685 return true; | |
686 } | |
687 | |
688 if (!abort_if_unrecognized) { | |
689 // caller wants another chance, so give it to him | |
690 return false; | |
691 } | |
692 | |
693 if (pc == NULL && uc != NULL) { | |
694 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); | |
695 } | |
696 | |
697 // unmask current signal | |
698 sigset_t newset; | |
699 sigemptyset(&newset); | |
700 sigaddset(&newset, sig); | |
701 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
702 | |
703 VMError err(t, sig, pc, info, ucVoid); | |
704 err.report_and_die(); | |
705 | |
706 ShouldNotReachHere(); | |
707 } | |
708 | |
709 void os::Linux::init_thread_fpu_state(void) { | |
710 // Nothing to do | |
711 } | |
712 | |
713 int os::Linux::get_fpu_control_word() { | |
714 return 0; | |
715 } | |
716 | |
717 void os::Linux::set_fpu_control_word(int fpu) { | |
718 // nothing | |
719 } | |
720 | |
721 bool os::is_allocatable(size_t bytes) { | |
722 #ifdef _LP64 | |
723 return true; | |
724 #else | |
725 if (bytes < 2 * G) { | |
726 return true; | |
727 } | |
728 | |
729 char* addr = reserve_memory(bytes, NULL); | |
730 | |
731 if (addr != NULL) { | |
732 release_memory(addr, bytes); | |
733 } | |
734 | |
735 return addr != NULL; | |
736 #endif // _LP64 | |
737 } | |
738 | |
739 /////////////////////////////////////////////////////////////////////////////// | |
740 // thread stack | |
741 | |
742 size_t os::Linux::min_stack_allowed = 128 * K; | |
743 | |
744 // pthread on Ubuntu is always in floating stack mode | |
745 bool os::Linux::supports_variable_stack_size() { return true; } | |
746 | |
747 // return default stack size for thr_type | |
748 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
749 // default stack size (compiler thread needs larger stack) | |
750 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
751 return s; | |
752 } | |
753 | |
754 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
755 // Creating guard page is very expensive. Java thread has HotSpot | |
756 // guard page, only enable glibc guard page for non-Java threads. | |
757 return (thr_type == java_thread ? 0 : page_size()); | |
758 } |