Mercurial > hg > truffle
annotate src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp @ 16898:433ece7d941d
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 22 Aug 2014 16:03:49 +0200 |
parents | 4ca6dc0799b6 |
children | 89152779163c |
rev | line source |
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133 | 1 /* |
14909 | 2 * Copyright (c) 1999, 2012, 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 |
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26 #include "asm/macroAssembler.hpp" |
1972 | 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" | |
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51 #include "runtime/thread.inline.hpp" |
1972 | 52 #include "runtime/timer.hpp" |
53 #include "utilities/events.hpp" | |
54 #include "utilities/vmError.hpp" | |
133 | 55 |
56 // Linux/Sparc has rather obscure naming of registers in sigcontext | |
57 // different between 32 and 64 bits | |
58 #ifdef _LP64 | |
59 #define SIG_PC(x) ((x)->sigc_regs.tpc) | |
60 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) | |
61 #define SIG_REGS(x) ((x)->sigc_regs) | |
62 #else | |
63 #define SIG_PC(x) ((x)->si_regs.pc) | |
64 #define SIG_NPC(x) ((x)->si_regs.npc) | |
65 #define SIG_REGS(x) ((x)->si_regs) | |
66 #endif | |
67 | |
68 // those are to reference registers in sigcontext | |
69 enum { | |
70 CON_G0 = 0, | |
71 CON_G1, | |
72 CON_G2, | |
73 CON_G3, | |
74 CON_G4, | |
75 CON_G5, | |
76 CON_G6, | |
77 CON_G7, | |
78 CON_O0, | |
79 CON_O1, | |
80 CON_O2, | |
81 CON_O3, | |
82 CON_O4, | |
83 CON_O5, | |
84 CON_O6, | |
85 CON_O7, | |
86 }; | |
87 | |
88 static inline void set_cont_address(sigcontext* ctx, address addr) { | |
89 SIG_PC(ctx) = (intptr_t)addr; | |
90 SIG_NPC(ctx) = (intptr_t)(addr+4); | |
91 } | |
92 | |
93 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
94 // currently interrupted by SIGPROF. | |
95 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested | |
96 // signal frames. Currently we don't do that on Linux, so it's the | |
97 // same as os::fetch_frame_from_context(). | |
98 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
99 ucontext_t* uc, | |
100 intptr_t** ret_sp, | |
101 intptr_t** ret_fp) { | |
102 assert(thread != NULL, "just checking"); | |
103 assert(ret_sp != NULL, "just checking"); | |
104 assert(ret_fp != NULL, "just checking"); | |
105 | |
106 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
107 } | |
108 | |
109 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
110 intptr_t** ret_sp, | |
111 intptr_t** ret_fp) { | |
112 ucontext_t* uc = (ucontext_t*) ucVoid; | |
113 ExtendedPC epc; | |
114 | |
115 if (uc != NULL) { | |
116 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
117 if (ret_sp) { | |
118 *ret_sp = os::Linux::ucontext_get_sp(uc); | |
119 } | |
120 if (ret_fp) { | |
121 *ret_fp = os::Linux::ucontext_get_fp(uc); | |
122 } | |
123 } else { | |
124 // construct empty ExtendedPC for return value checking | |
125 epc = ExtendedPC(NULL); | |
126 if (ret_sp) { | |
127 *ret_sp = (intptr_t*) NULL; | |
128 } | |
129 if (ret_fp) { | |
130 *ret_fp = (intptr_t*) NULL; | |
131 } | |
132 } | |
133 | |
134 return epc; | |
135 } | |
136 | |
137 frame os::fetch_frame_from_context(void* ucVoid) { | |
138 intptr_t* sp; | |
139 intptr_t* fp; | |
140 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
141 return frame(sp, fp, epc.pc()); | |
142 } | |
143 | |
144 frame os::get_sender_for_C_frame(frame* fr) { | |
145 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
146 } | |
147 | |
148 frame os::current_frame() { | |
149 fprintf(stderr, "current_frame()"); | |
150 | |
151 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
152 frame myframe(sp, frame::unpatchable, | |
153 CAST_FROM_FN_PTR(address, os::current_frame)); | |
154 if (os::is_first_C_frame(&myframe)) { | |
155 // stack is not walkable | |
156 return frame(NULL, frame::unpatchable, NULL); | |
157 } else { | |
158 return os::get_sender_for_C_frame(&myframe); | |
159 } | |
160 } | |
161 | |
162 address os::current_stack_pointer() { | |
163 register void *sp __asm__ ("sp"); | |
164 return (address)sp; | |
165 } | |
166 | |
167 static void current_stack_region(address* bottom, size_t* size) { | |
168 if (os::Linux::is_initial_thread()) { | |
169 // initial thread needs special handling because pthread_getattr_np() | |
170 // may return bogus value. | |
171 *bottom = os::Linux::initial_thread_stack_bottom(); | |
172 *size = os::Linux::initial_thread_stack_size(); | |
173 } else { | |
174 pthread_attr_t attr; | |
175 | |
176 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
177 | |
178 // JVM needs to know exact stack location, abort if it fails | |
179 if (rslt != 0) { | |
180 if (rslt == ENOMEM) { | |
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181 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); |
133 | 182 } else { |
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183 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
133 | 184 } |
185 } | |
186 | |
187 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { | |
188 fatal("Can not locate current stack attributes!"); | |
189 } | |
190 | |
191 pthread_attr_destroy(&attr); | |
192 } | |
193 assert(os::current_stack_pointer() >= *bottom && | |
194 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
195 } | |
196 | |
197 address os::current_stack_base() { | |
198 address bottom; | |
199 size_t size; | |
200 current_stack_region(&bottom, &size); | |
201 return bottom + size; | |
202 } | |
203 | |
204 size_t os::current_stack_size() { | |
205 // stack size includes normal stack and HotSpot guard pages | |
206 address bottom; | |
207 size_t size; | |
208 current_stack_region(&bottom, &size); | |
209 return size; | |
210 } | |
211 | |
212 char* os::non_memory_address_word() { | |
213 // Must never look like an address returned by reserve_memory, | |
214 // even in its subfields (as defined by the CPU immediate fields, | |
215 // if the CPU splits constants across multiple instructions). | |
216 // On SPARC, 0 != %hi(any real address), because there is no | |
217 // allocation in the first 1Kb of the virtual address space. | |
218 return (char*) 0; | |
219 } | |
220 | |
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221 void os::initialize_thread(Thread* thr) {} |
133 | 222 |
223 void os::print_context(outputStream *st, void *context) { | |
224 if (context == NULL) return; | |
225 | |
226 ucontext_t* uc = (ucontext_t*)context; | |
227 sigcontext* sc = (sigcontext*)context; | |
228 st->print_cr("Registers:"); | |
229 | |
1907 | 230 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT |
231 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, | |
232 SIG_REGS(sc).u_regs[CON_G1], | |
233 SIG_REGS(sc).u_regs[CON_G2], | |
234 SIG_REGS(sc).u_regs[CON_G3], | |
235 SIG_REGS(sc).u_regs[CON_G4]); | |
236 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT | |
237 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, | |
238 SIG_REGS(sc).u_regs[CON_G5], | |
239 SIG_REGS(sc).u_regs[CON_G6], | |
240 SIG_REGS(sc).u_regs[CON_G7], | |
241 SIG_REGS(sc).y); | |
133 | 242 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT |
243 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, | |
244 SIG_REGS(sc).u_regs[CON_O0], | |
245 SIG_REGS(sc).u_regs[CON_O1], | |
246 SIG_REGS(sc).u_regs[CON_O2], | |
247 SIG_REGS(sc).u_regs[CON_O3]); | |
248 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT | |
249 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, | |
250 SIG_REGS(sc).u_regs[CON_O4], | |
251 SIG_REGS(sc).u_regs[CON_O5], | |
252 SIG_REGS(sc).u_regs[CON_O6], | |
253 SIG_REGS(sc).u_regs[CON_O7]); | |
254 | |
1907 | 255 |
256 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
257 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT | |
258 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, | |
259 sp[L0->sp_offset_in_saved_window()], | |
260 sp[L1->sp_offset_in_saved_window()], | |
261 sp[L2->sp_offset_in_saved_window()], | |
262 sp[L3->sp_offset_in_saved_window()]); | |
263 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT | |
264 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, | |
265 sp[L4->sp_offset_in_saved_window()], | |
266 sp[L5->sp_offset_in_saved_window()], | |
267 sp[L6->sp_offset_in_saved_window()], | |
268 sp[L7->sp_offset_in_saved_window()]); | |
269 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT | |
270 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, | |
271 sp[I0->sp_offset_in_saved_window()], | |
272 sp[I1->sp_offset_in_saved_window()], | |
273 sp[I2->sp_offset_in_saved_window()], | |
274 sp[I3->sp_offset_in_saved_window()]); | |
275 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT | |
276 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, | |
277 sp[I4->sp_offset_in_saved_window()], | |
278 sp[I5->sp_offset_in_saved_window()], | |
279 sp[I6->sp_offset_in_saved_window()], | |
280 sp[I7->sp_offset_in_saved_window()]); | |
133 | 281 |
282 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, | |
283 SIG_PC(sc), | |
284 SIG_NPC(sc)); | |
285 st->cr(); | |
286 st->cr(); | |
287 | |
288 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
289 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
290 st->cr(); | |
291 | |
292 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
293 // point to garbage if entry point in an nmethod is corrupted. Leave | |
294 // this at the end, and hope for the best. | |
295 address pc = os::Linux::ucontext_get_pc(uc); | |
296 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
1907 | 297 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
298 } | |
299 | |
300 | |
301 void os::print_register_info(outputStream *st, void *context) { | |
302 if (context == NULL) return; | |
303 | |
304 ucontext_t *uc = (ucontext_t*)context; | |
305 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
306 | |
307 st->print_cr("Register to memory mapping:"); | |
308 st->cr(); | |
309 | |
310 // this is only for the "general purpose" registers | |
311 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON__G1]); | |
312 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON__G2]); | |
313 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON__G3]); | |
314 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON__G4]); | |
315 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON__G5]); | |
316 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON__G6]); | |
317 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON__G7]); | |
318 st->cr(); | |
319 | |
320 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON__O0]); | |
321 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON__O1]); | |
322 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON__O2]); | |
323 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON__O3]); | |
324 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON__O4]); | |
325 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON__O5]); | |
326 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON__O6]); | |
327 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON__O7]); | |
328 st->cr(); | |
329 | |
330 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); | |
331 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); | |
332 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); | |
333 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); | |
334 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); | |
335 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); | |
336 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); | |
337 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); | |
338 st->cr(); | |
339 | |
340 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); | |
341 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); | |
342 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); | |
343 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); | |
344 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); | |
345 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); | |
346 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); | |
347 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); | |
348 st->cr(); | |
133 | 349 } |
350 | |
351 | |
352 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
353 return (address) SIG_PC((sigcontext*)uc); | |
354 } | |
355 | |
356 intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { | |
357 return (intptr_t*) | |
358 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); | |
359 } | |
360 | |
361 // not used on Sparc | |
362 intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { | |
363 ShouldNotReachHere(); | |
364 return NULL; | |
365 } | |
366 | |
367 // Utility functions | |
368 | |
369 inline static bool checkPrefetch(sigcontext* uc, address pc) { | |
11127 | 370 if (StubRoutines::is_safefetch_fault(pc)) { |
371 set_cont_address(uc, address(StubRoutines::continuation_for_safefetch_fault(pc))); | |
133 | 372 return true; |
373 } | |
374 return false; | |
375 } | |
376 | |
377 inline static bool checkOverflow(sigcontext* uc, | |
378 address pc, | |
379 address addr, | |
380 JavaThread* thread, | |
381 address* stub) { | |
382 // check if fault address is within thread stack | |
383 if (addr < thread->stack_base() && | |
384 addr >= thread->stack_base() - thread->stack_size()) { | |
385 // stack overflow | |
386 if (thread->in_stack_yellow_zone(addr)) { | |
387 thread->disable_stack_yellow_zone(); | |
388 if (thread->thread_state() == _thread_in_Java) { | |
389 // Throw a stack overflow exception. Guard pages will be reenabled | |
390 // while unwinding the stack. | |
391 *stub = | |
392 SharedRuntime::continuation_for_implicit_exception(thread, | |
393 pc, | |
394 SharedRuntime::STACK_OVERFLOW); | |
395 } else { | |
396 // Thread was in the vm or native code. Return and try to finish. | |
397 return true; | |
398 } | |
399 } else if (thread->in_stack_red_zone(addr)) { | |
400 // Fatal red zone violation. Disable the guard pages and fall through | |
401 // to handle_unexpected_exception way down below. | |
402 thread->disable_stack_red_zone(); | |
403 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
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404 |
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405 // This is a likely cause, but hard to verify. Let's just print |
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406 // it as a hint. |
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407 tty->print_raw_cr("Please check if any of your loaded .so files has " |
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408 "enabled executable stack (see man page execstack(8))"); |
133 | 409 } else { |
410 // Accessing stack address below sp may cause SEGV if current | |
411 // thread has MAP_GROWSDOWN stack. This should only happen when | |
412 // current thread was created by user code with MAP_GROWSDOWN flag | |
413 // and then attached to VM. See notes in os_linux.cpp. | |
414 if (thread->osthread()->expanding_stack() == 0) { | |
415 thread->osthread()->set_expanding_stack(); | |
416 if (os::Linux::manually_expand_stack(thread, addr)) { | |
417 thread->osthread()->clear_expanding_stack(); | |
418 return true; | |
419 } | |
420 thread->osthread()->clear_expanding_stack(); | |
421 } else { | |
422 fatal("recursive segv. expanding stack."); | |
423 } | |
424 } | |
425 } | |
426 return false; | |
427 } | |
428 | |
429 inline static bool checkPollingPage(address pc, address fault, address* stub) { | |
430 if (fault == os::get_polling_page()) { | |
431 *stub = SharedRuntime::get_poll_stub(pc); | |
432 return true; | |
433 } | |
434 return false; | |
435 } | |
436 | |
437 inline static bool checkByteBuffer(address pc, address* stub) { | |
438 // BugId 4454115: A read from a MappedByteBuffer can fault | |
439 // here if the underlying file has been truncated. | |
440 // Do not crash the VM in such a case. | |
441 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
442 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
443 if (nm != NULL && nm->has_unsafe_access()) { | |
444 *stub = StubRoutines::handler_for_unsafe_access(); | |
445 return true; | |
446 } | |
447 return false; | |
448 } | |
449 | |
450 inline static bool checkVerifyOops(address pc, address fault, address* stub) { | |
451 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] | |
452 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { | |
453 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; | |
454 warning("fixed up memory fault in +VerifyOops at address " | |
455 INTPTR_FORMAT, fault); | |
456 return true; | |
457 } | |
458 return false; | |
459 } | |
460 | |
461 inline static bool checkFPFault(address pc, int code, | |
462 JavaThread* thread, address* stub) { | |
463 if (code == FPE_INTDIV || code == FPE_FLTDIV) { | |
464 *stub = | |
465 SharedRuntime:: | |
466 continuation_for_implicit_exception(thread, | |
467 pc, | |
468 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
469 return true; | |
470 } | |
471 return false; | |
472 } | |
473 | |
474 inline static bool checkNullPointer(address pc, intptr_t fault, | |
475 JavaThread* thread, address* stub) { | |
476 if (!MacroAssembler::needs_explicit_null_check(fault)) { | |
477 // Determination of interpreter/vtable stub/compiled code null | |
478 // exception | |
479 *stub = | |
480 SharedRuntime:: | |
481 continuation_for_implicit_exception(thread, pc, | |
482 SharedRuntime::IMPLICIT_NULL); | |
483 return true; | |
484 } | |
485 return false; | |
486 } | |
487 | |
488 inline static bool checkFastJNIAccess(address pc, address* stub) { | |
489 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
490 if (addr != (address)-1) { | |
491 *stub = addr; | |
492 return true; | |
493 } | |
494 return false; | |
495 } | |
496 | |
497 inline static bool checkSerializePage(JavaThread* thread, address addr) { | |
498 return os::is_memory_serialize_page(thread, addr); | |
499 } | |
500 | |
501 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { | |
502 if (nativeInstruction_at(*pc)->is_zombie()) { | |
503 // zombie method (ld [%g0],%o7 instruction) | |
504 *stub = SharedRuntime::get_handle_wrong_method_stub(); | |
505 | |
506 // At the stub it needs to look like a call from the caller of this | |
507 // method (not a call from the segv site). | |
508 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
509 return true; | |
510 } | |
511 return false; | |
512 } | |
513 | |
514 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { | |
515 #ifdef COMPILER2 | |
516 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { | |
517 #ifdef ASSERT | |
518 #ifdef TIERED | |
519 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
520 assert(cb->is_compiled_by_c2(), "Wrong compiler"); | |
521 #endif // TIERED | |
522 #endif // ASSERT | |
523 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. | |
524 *stub = SharedRuntime::get_ic_miss_stub(); | |
525 // At the stub it needs to look like a call from the caller of this | |
526 // method (not a call from the segv site). | |
527 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
528 return true; | |
529 } | |
530 #endif // COMPILER2 | |
531 return false; | |
532 } | |
533 | |
2191 | 534 extern "C" JNIEXPORT int |
133 | 535 JVM_handle_linux_signal(int sig, |
536 siginfo_t* info, | |
537 void* ucVoid, | |
538 int abort_if_unrecognized) { | |
539 // in fact this isn't ucontext_t* at all, but struct sigcontext* | |
540 // but Linux porting layer uses ucontext_t, so to minimize code change | |
541 // we cast as needed | |
542 ucontext_t* ucFake = (ucontext_t*) ucVoid; | |
543 sigcontext* uc = (sigcontext*)ucVoid; | |
544 | |
545 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
546 | |
11151 | 547 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away |
548 // (no destructors can be run) | |
549 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); | |
550 | |
133 | 551 SignalHandlerMark shm(t); |
552 | |
553 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
554 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
555 // or have a SIGILL handler when detecting CPU type). When that happens, | |
556 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
557 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
558 // that do not require siginfo/ucontext first. | |
559 | |
560 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
561 // allow chained handler to go first | |
562 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
563 return true; | |
564 } else { | |
565 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
566 char buf[64]; | |
567 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
568 os::exception_name(sig, buf, sizeof(buf))); | |
569 } | |
570 return true; | |
571 } | |
572 } | |
573 | |
574 JavaThread* thread = NULL; | |
575 VMThread* vmthread = NULL; | |
576 if (os::Linux::signal_handlers_are_installed) { | |
577 if (t != NULL ){ | |
578 if(t->is_Java_thread()) { | |
579 thread = (JavaThread*)t; | |
580 } | |
581 else if(t->is_VM_thread()){ | |
582 vmthread = (VMThread *)t; | |
583 } | |
584 } | |
585 } | |
586 | |
587 // decide if this trap can be handled by a stub | |
588 address stub = NULL; | |
589 address pc = NULL; | |
590 address npc = NULL; | |
591 | |
592 //%note os_trap_1 | |
593 if (info != NULL && uc != NULL && thread != NULL) { | |
594 pc = address(SIG_PC(uc)); | |
595 npc = address(SIG_NPC(uc)); | |
596 | |
597 // Check to see if we caught the safepoint code in the | |
598 // process of write protecting the memory serialization page. | |
599 // It write enables the page immediately after protecting it | |
600 // so we can just return to retry the write. | |
601 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { | |
602 // Block current thread until the memory serialize page permission restored. | |
603 os::block_on_serialize_page_trap(); | |
604 return 1; | |
605 } | |
606 | |
607 if (checkPrefetch(uc, pc)) { | |
608 return 1; | |
609 } | |
610 | |
611 // Handle ALL stack overflow variations here | |
612 if (sig == SIGSEGV) { | |
613 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { | |
614 return 1; | |
615 } | |
616 } | |
617 | |
618 if (sig == SIGBUS && | |
619 thread->thread_state() == _thread_in_vm && | |
620 thread->doing_unsafe_access()) { | |
621 stub = StubRoutines::handler_for_unsafe_access(); | |
622 } | |
623 | |
624 if (thread->thread_state() == _thread_in_Java) { | |
625 do { | |
626 // Java thread running in Java code => find exception handler if any | |
627 // a fault inside compiled code, the interpreter, or a stub | |
628 | |
629 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { | |
630 break; | |
631 } | |
632 | |
633 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { | |
634 break; | |
635 } | |
636 | |
637 if ((sig == SIGSEGV || sig == SIGBUS) && | |
638 checkVerifyOops(pc, (address)info->si_addr, &stub)) { | |
639 break; | |
640 } | |
641 | |
642 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { | |
643 break; | |
644 } | |
645 | |
646 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { | |
647 break; | |
648 } | |
649 | |
650 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { | |
651 break; | |
652 } | |
653 | |
654 if ((sig == SIGSEGV) && | |
655 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { | |
656 break; | |
657 } | |
658 } while (0); | |
659 | |
660 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
661 // and the heap gets shrunk before the field access. | |
662 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
663 checkFastJNIAccess(pc, &stub); | |
664 } | |
665 } | |
666 | |
667 if (stub != NULL) { | |
668 // save all thread context in case we need to restore it | |
669 thread->set_saved_exception_pc(pc); | |
670 thread->set_saved_exception_npc(npc); | |
671 set_cont_address(uc, stub); | |
672 return true; | |
673 } | |
674 } | |
675 | |
676 // signal-chaining | |
677 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
678 return true; | |
679 } | |
680 | |
681 if (!abort_if_unrecognized) { | |
682 // caller wants another chance, so give it to him | |
683 return false; | |
684 } | |
685 | |
686 if (pc == NULL && uc != NULL) { | |
687 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); | |
688 } | |
689 | |
690 // unmask current signal | |
691 sigset_t newset; | |
692 sigemptyset(&newset); | |
693 sigaddset(&newset, sig); | |
694 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
695 | |
696 VMError err(t, sig, pc, info, ucVoid); | |
697 err.report_and_die(); | |
698 | |
699 ShouldNotReachHere(); | |
700 } | |
701 | |
702 void os::Linux::init_thread_fpu_state(void) { | |
703 // Nothing to do | |
704 } | |
705 | |
706 int os::Linux::get_fpu_control_word() { | |
707 return 0; | |
708 } | |
709 | |
710 void os::Linux::set_fpu_control_word(int fpu) { | |
711 // nothing | |
712 } | |
713 | |
714 bool os::is_allocatable(size_t bytes) { | |
715 #ifdef _LP64 | |
716 return true; | |
717 #else | |
718 if (bytes < 2 * G) { | |
719 return true; | |
720 } | |
721 | |
722 char* addr = reserve_memory(bytes, NULL); | |
723 | |
724 if (addr != NULL) { | |
725 release_memory(addr, bytes); | |
726 } | |
727 | |
728 return addr != NULL; | |
729 #endif // _LP64 | |
730 } | |
731 | |
732 /////////////////////////////////////////////////////////////////////////////// | |
733 // thread stack | |
734 | |
735 size_t os::Linux::min_stack_allowed = 128 * K; | |
736 | |
737 // pthread on Ubuntu is always in floating stack mode | |
738 bool os::Linux::supports_variable_stack_size() { return true; } | |
739 | |
740 // return default stack size for thr_type | |
741 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
742 // default stack size (compiler thread needs larger stack) | |
743 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
744 return s; | |
745 } | |
746 | |
747 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
748 // Creating guard page is very expensive. Java thread has HotSpot | |
749 // guard page, only enable glibc guard page for non-Java threads. | |
750 return (thr_type == java_thread ? 0 : page_size()); | |
751 } | |
5903
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752 |
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753 #ifndef PRODUCT |
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754 void os::verify_stack_alignment() { |
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755 } |
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756 #endif |