Mercurial > hg > truffle
annotate src/os_cpu/linux_x86/vm/os_linux_x86.cpp @ 7780:550c952f5d3f
Merge
author | Christian Humer <christian.humer@gmail.com> |
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date | Tue, 12 Feb 2013 16:06:20 +0100 |
parents | 291ffc492eb6 |
children | 5fc51c1ecdeb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 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 "os_share_linux.hpp" | |
37 #include "prims/jniFastGetField.hpp" | |
38 #include "prims/jvm.h" | |
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.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" | |
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50 #include "runtime/thread.inline.hpp" |
1972 | 51 #include "runtime/timer.hpp" |
52 #include "utilities/events.hpp" | |
53 #include "utilities/vmError.hpp" | |
0 | 54 |
55 // put OS-includes here | |
56 # include <sys/types.h> | |
57 # include <sys/mman.h> | |
58 # include <pthread.h> | |
59 # include <signal.h> | |
60 # include <errno.h> | |
61 # include <dlfcn.h> | |
62 # include <stdlib.h> | |
63 # include <stdio.h> | |
64 # include <unistd.h> | |
65 # include <sys/resource.h> | |
66 # include <pthread.h> | |
67 # include <sys/stat.h> | |
68 # include <sys/time.h> | |
69 # include <sys/utsname.h> | |
70 # include <sys/socket.h> | |
71 # include <sys/wait.h> | |
72 # include <pwd.h> | |
73 # include <poll.h> | |
74 # include <ucontext.h> | |
75 # include <fpu_control.h> | |
76 | |
77 #ifdef AMD64 | |
78 #define REG_SP REG_RSP | |
79 #define REG_PC REG_RIP | |
80 #define REG_FP REG_RBP | |
81 #define SPELL_REG_SP "rsp" | |
82 #define SPELL_REG_FP "rbp" | |
83 #else | |
84 #define REG_SP REG_UESP | |
85 #define REG_PC REG_EIP | |
86 #define REG_FP REG_EBP | |
87 #define SPELL_REG_SP "esp" | |
88 #define SPELL_REG_FP "ebp" | |
89 #endif // AMD64 | |
90 | |
91 address os::current_stack_pointer() { | |
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92 #ifdef SPARC_WORKS |
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93 register void *esp; |
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94 __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp)); |
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95 return (address) ((char*)esp + sizeof(long)*2); |
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96 #else |
0 | 97 register void *esp __asm__ (SPELL_REG_SP); |
98 return (address) esp; | |
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99 #endif |
0 | 100 } |
101 | |
102 char* os::non_memory_address_word() { | |
103 // Must never look like an address returned by reserve_memory, | |
104 // even in its subfields (as defined by the CPU immediate fields, | |
105 // if the CPU splits constants across multiple instructions). | |
106 | |
107 return (char*) -1; | |
108 } | |
109 | |
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110 void os::initialize_thread(Thread* thr) { |
0 | 111 // Nothing to do. |
112 } | |
113 | |
114 address os::Linux::ucontext_get_pc(ucontext_t * uc) { | |
115 return (address)uc->uc_mcontext.gregs[REG_PC]; | |
116 } | |
117 | |
118 intptr_t* os::Linux::ucontext_get_sp(ucontext_t * uc) { | |
119 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; | |
120 } | |
121 | |
122 intptr_t* os::Linux::ucontext_get_fp(ucontext_t * uc) { | |
123 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; | |
124 } | |
125 | |
126 // For Forte Analyzer AsyncGetCallTrace profiling support - thread | |
127 // is currently interrupted by SIGPROF. | |
128 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal | |
129 // frames. Currently we don't do that on Linux, so it's the same as | |
130 // os::fetch_frame_from_context(). | |
131 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
132 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { | |
133 | |
134 assert(thread != NULL, "just checking"); | |
135 assert(ret_sp != NULL, "just checking"); | |
136 assert(ret_fp != NULL, "just checking"); | |
137 | |
138 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
139 } | |
140 | |
141 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
142 intptr_t** ret_sp, intptr_t** ret_fp) { | |
143 | |
144 ExtendedPC epc; | |
145 ucontext_t* uc = (ucontext_t*)ucVoid; | |
146 | |
147 if (uc != NULL) { | |
148 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
149 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); | |
150 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc); | |
151 } else { | |
152 // construct empty ExtendedPC for return value checking | |
153 epc = ExtendedPC(NULL); | |
154 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
155 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
156 } | |
157 | |
158 return epc; | |
159 } | |
160 | |
161 frame os::fetch_frame_from_context(void* ucVoid) { | |
162 intptr_t* sp; | |
163 intptr_t* fp; | |
164 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
165 return frame(sp, fp, epc.pc()); | |
166 } | |
167 | |
168 // By default, gcc always save frame pointer (%ebp/%rbp) on stack. It may get | |
169 // turned off by -fomit-frame-pointer, | |
170 frame os::get_sender_for_C_frame(frame* fr) { | |
171 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
172 } | |
173 | |
174 intptr_t* _get_previous_fp() { | |
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175 #ifdef SPARC_WORKS |
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176 register intptr_t **ebp; |
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177 __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp)); |
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178 #else |
0 | 179 register intptr_t **ebp __asm__ (SPELL_REG_FP); |
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180 #endif |
0 | 181 return (intptr_t*) *ebp; // we want what it points to. |
182 } | |
183 | |
184 | |
185 frame os::current_frame() { | |
186 intptr_t* fp = _get_previous_fp(); | |
187 frame myframe((intptr_t*)os::current_stack_pointer(), | |
188 (intptr_t*)fp, | |
189 CAST_FROM_FN_PTR(address, os::current_frame)); | |
190 if (os::is_first_C_frame(&myframe)) { | |
191 // stack is not walkable | |
192 return frame(NULL, NULL, NULL); | |
193 } else { | |
194 return os::get_sender_for_C_frame(&myframe); | |
195 } | |
196 } | |
197 | |
198 // Utility functions | |
199 | |
200 // From IA32 System Programming Guide | |
201 enum { | |
202 trap_page_fault = 0xE | |
203 }; | |
204 | |
205 extern "C" void Fetch32PFI () ; | |
206 extern "C" void Fetch32Resume () ; | |
207 #ifdef AMD64 | |
208 extern "C" void FetchNPFI () ; | |
209 extern "C" void FetchNResume () ; | |
210 #endif // AMD64 | |
211 | |
2191 | 212 extern "C" JNIEXPORT int |
0 | 213 JVM_handle_linux_signal(int sig, |
214 siginfo_t* info, | |
215 void* ucVoid, | |
216 int abort_if_unrecognized) { | |
217 ucontext_t* uc = (ucontext_t*) ucVoid; | |
218 | |
219 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
220 | |
221 SignalHandlerMark shm(t); | |
222 | |
223 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
224 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
225 // or have a SIGILL handler when detecting CPU type). When that happens, | |
226 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
227 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
228 // that do not require siginfo/ucontext first. | |
229 | |
230 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
231 // allow chained handler to go first | |
232 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
233 return true; | |
234 } else { | |
235 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
236 char buf[64]; | |
237 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
238 os::exception_name(sig, buf, sizeof(buf))); | |
239 } | |
240 return true; | |
241 } | |
242 } | |
243 | |
244 JavaThread* thread = NULL; | |
245 VMThread* vmthread = NULL; | |
246 if (os::Linux::signal_handlers_are_installed) { | |
247 if (t != NULL ){ | |
248 if(t->is_Java_thread()) { | |
249 thread = (JavaThread*)t; | |
250 } | |
251 else if(t->is_VM_thread()){ | |
252 vmthread = (VMThread *)t; | |
253 } | |
254 } | |
255 } | |
256 /* | |
257 NOTE: does not seem to work on linux. | |
258 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { | |
259 // can't decode this kind of signal | |
260 info = NULL; | |
261 } else { | |
262 assert(sig == info->si_signo, "bad siginfo"); | |
263 } | |
264 */ | |
265 // decide if this trap can be handled by a stub | |
266 address stub = NULL; | |
267 | |
268 address pc = NULL; | |
269 | |
270 //%note os_trap_1 | |
271 if (info != NULL && uc != NULL && thread != NULL) { | |
272 pc = (address) os::Linux::ucontext_get_pc(uc); | |
273 | |
274 if (pc == (address) Fetch32PFI) { | |
275 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; | |
276 return 1 ; | |
277 } | |
278 #ifdef AMD64 | |
279 if (pc == (address) FetchNPFI) { | |
280 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ; | |
281 return 1 ; | |
282 } | |
283 #endif // AMD64 | |
284 | |
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285 if (TraceSignals) { |
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286 CodeBlob* cb = CodeCache::find_blob(pc); |
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287 if (cb != NULL && cb->is_nmethod()) { |
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288 nmethod* nm = (nmethod*)cb; |
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289 int rel = pc - nm->code_begin(); |
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290 tty->print_cr(err_msg("Implicit exception at %d of method %s", rel, nm->method()->name()->as_C_string())); |
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291 } else { |
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292 tty->print_cr("No code blob found for %x", pc); |
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293 } |
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294 } |
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295 |
0 | 296 // Handle ALL stack overflow variations here |
297 if (sig == SIGSEGV) { | |
298 address addr = (address) info->si_addr; | |
299 | |
300 // check if fault address is within thread stack | |
301 if (addr < thread->stack_base() && | |
302 addr >= thread->stack_base() - thread->stack_size()) { | |
303 // stack overflow | |
304 if (thread->in_stack_yellow_zone(addr)) { | |
305 thread->disable_stack_yellow_zone(); | |
306 if (thread->thread_state() == _thread_in_Java) { | |
307 // Throw a stack overflow exception. Guard pages will be reenabled | |
308 // while unwinding the stack. | |
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309 if (WizardMode) tty->print("implicit: %08x%08x\n", ((long long)pc) >> 32, pc); |
0 | 310 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); |
311 } else { | |
312 // Thread was in the vm or native code. Return and try to finish. | |
313 return 1; | |
314 } | |
315 } else if (thread->in_stack_red_zone(addr)) { | |
316 // Fatal red zone violation. Disable the guard pages and fall through | |
317 // to handle_unexpected_exception way down below. | |
318 thread->disable_stack_red_zone(); | |
319 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
320 } else { | |
321 // Accessing stack address below sp may cause SEGV if current | |
322 // thread has MAP_GROWSDOWN stack. This should only happen when | |
323 // current thread was created by user code with MAP_GROWSDOWN flag | |
324 // and then attached to VM. See notes in os_linux.cpp. | |
325 if (thread->osthread()->expanding_stack() == 0) { | |
326 thread->osthread()->set_expanding_stack(); | |
327 if (os::Linux::manually_expand_stack(thread, addr)) { | |
328 thread->osthread()->clear_expanding_stack(); | |
329 return 1; | |
330 } | |
331 thread->osthread()->clear_expanding_stack(); | |
332 } else { | |
333 fatal("recursive segv. expanding stack."); | |
334 } | |
335 } | |
336 } | |
337 } | |
338 | |
339 if (thread->thread_state() == _thread_in_Java) { | |
340 // Java thread running in Java code => find exception handler if any | |
341 // a fault inside compiled code, the interpreter, or a stub | |
342 | |
343 if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { | |
344 stub = SharedRuntime::get_poll_stub(pc); | |
345 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { | |
346 // BugId 4454115: A read from a MappedByteBuffer can fault | |
347 // here if the underlying file has been truncated. | |
348 // Do not crash the VM in such a case. | |
349 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
350 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
351 if (nm != NULL && nm->has_unsafe_access()) { | |
352 stub = StubRoutines::handler_for_unsafe_access(); | |
353 } | |
354 } | |
355 else | |
356 | |
357 #ifdef AMD64 | |
358 if (sig == SIGFPE && | |
359 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { | |
360 stub = | |
361 SharedRuntime:: | |
362 continuation_for_implicit_exception(thread, | |
363 pc, | |
364 SharedRuntime:: | |
365 IMPLICIT_DIVIDE_BY_ZERO); | |
366 #else | |
367 if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { | |
368 // HACK: si_code does not work on linux 2.2.12-20!!! | |
369 int op = pc[0]; | |
370 if (op == 0xDB) { | |
371 // FIST | |
372 // TODO: The encoding of D2I in i486.ad can cause an exception | |
373 // prior to the fist instruction if there was an invalid operation | |
374 // pending. We want to dismiss that exception. From the win_32 | |
375 // side it also seems that if it really was the fist causing | |
376 // the exception that we do the d2i by hand with different | |
377 // rounding. Seems kind of weird. | |
378 // NOTE: that we take the exception at the NEXT floating point instruction. | |
379 assert(pc[0] == 0xDB, "not a FIST opcode"); | |
380 assert(pc[1] == 0x14, "not a FIST opcode"); | |
381 assert(pc[2] == 0x24, "not a FIST opcode"); | |
382 return true; | |
383 } else if (op == 0xF7) { | |
384 // IDIV | |
385 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
386 } else { | |
387 // TODO: handle more cases if we are using other x86 instructions | |
388 // that can generate SIGFPE signal on linux. | |
389 tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); | |
390 fatal("please update this code."); | |
391 } | |
392 #endif // AMD64 | |
393 } else if (sig == SIGSEGV && | |
394 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { | |
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395 if (TraceSignals) { |
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396 tty->print_cr("Implicit exception continuation"); |
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397 } |
0 | 398 // Determination of interpreter/vtable stub/compiled code null exception |
399 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); | |
1936
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400 } else if (sig == SIGSEGV) { |
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401 if (TraceSignals) { |
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402 tty->print_cr("would have needed explicit null check %d", (intptr_t)info->si_addr); |
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403 } |
0 | 404 } |
405 } else if (thread->thread_state() == _thread_in_vm && | |
406 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ | |
407 thread->doing_unsafe_access()) { | |
408 stub = StubRoutines::handler_for_unsafe_access(); | |
409 } | |
410 | |
411 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
412 // and the heap gets shrunk before the field access. | |
413 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
414 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
415 if (addr != (address)-1) { | |
416 stub = addr; | |
417 } | |
418 } | |
419 | |
420 // Check to see if we caught the safepoint code in the | |
421 // process of write protecting the memory serialization page. | |
422 // It write enables the page immediately after protecting it | |
423 // so we can just return to retry the write. | |
424 if ((sig == SIGSEGV) && | |
425 os::is_memory_serialize_page(thread, (address) info->si_addr)) { | |
426 // Block current thread until the memory serialize page permission restored. | |
427 os::block_on_serialize_page_trap(); | |
428 return true; | |
429 } | |
430 } | |
431 | |
432 #ifndef AMD64 | |
433 // Execution protection violation | |
434 // | |
435 // This should be kept as the last step in the triage. We don't | |
436 // have a dedicated trap number for a no-execute fault, so be | |
437 // conservative and allow other handlers the first shot. | |
438 // | |
439 // Note: We don't test that info->si_code == SEGV_ACCERR here. | |
440 // this si_code is so generic that it is almost meaningless; and | |
441 // the si_code for this condition may change in the future. | |
442 // Furthermore, a false-positive should be harmless. | |
443 if (UnguardOnExecutionViolation > 0 && | |
444 (sig == SIGSEGV || sig == SIGBUS) && | |
445 uc->uc_mcontext.gregs[REG_TRAPNO] == trap_page_fault) { | |
446 int page_size = os::vm_page_size(); | |
447 address addr = (address) info->si_addr; | |
448 address pc = os::Linux::ucontext_get_pc(uc); | |
449 // Make sure the pc and the faulting address are sane. | |
450 // | |
451 // If an instruction spans a page boundary, and the page containing | |
452 // the beginning of the instruction is executable but the following | |
453 // page is not, the pc and the faulting address might be slightly | |
454 // different - we still want to unguard the 2nd page in this case. | |
455 // | |
456 // 15 bytes seems to be a (very) safe value for max instruction size. | |
457 bool pc_is_near_addr = | |
458 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
459 bool instr_spans_page_boundary = | |
460 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
461 (intptr_t) page_size) > 0); | |
462 | |
463 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
464 static volatile address last_addr = | |
465 (address) os::non_memory_address_word(); | |
466 | |
467 // In conservative mode, don't unguard unless the address is in the VM | |
468 if (addr != last_addr && | |
469 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
470 | |
477
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471 // Set memory to RWX and retry |
0 | 472 address page_start = |
473 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
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474 bool res = os::protect_memory((char*) page_start, page_size, |
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475 os::MEM_PROT_RWX); |
0 | 476 |
477 if (PrintMiscellaneous && Verbose) { | |
478 char buf[256]; | |
479 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
480 "at " INTPTR_FORMAT | |
481 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, | |
482 page_start, (res ? "success" : "failed"), errno); | |
483 tty->print_raw_cr(buf); | |
484 } | |
485 stub = pc; | |
486 | |
487 // Set last_addr so if we fault again at the same address, we don't end | |
488 // up in an endless loop. | |
489 // | |
490 // There are two potential complications here. Two threads trapping at | |
491 // the same address at the same time could cause one of the threads to | |
492 // think it already unguarded, and abort the VM. Likely very rare. | |
493 // | |
494 // The other race involves two threads alternately trapping at | |
495 // different addresses and failing to unguard the page, resulting in | |
496 // an endless loop. This condition is probably even more unlikely than | |
497 // the first. | |
498 // | |
499 // Although both cases could be avoided by using locks or thread local | |
500 // last_addr, these solutions are unnecessary complication: this | |
501 // handler is a best-effort safety net, not a complete solution. It is | |
502 // disabled by default and should only be used as a workaround in case | |
503 // we missed any no-execute-unsafe VM code. | |
504 | |
505 last_addr = addr; | |
506 } | |
507 } | |
508 } | |
509 #endif // !AMD64 | |
510 | |
511 if (stub != NULL) { | |
512 // save all thread context in case we need to restore it | |
513 if (thread != NULL) thread->set_saved_exception_pc(pc); | |
514 | |
515 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; | |
516 return true; | |
517 } | |
518 | |
519 // signal-chaining | |
520 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
521 return true; | |
522 } | |
523 | |
524 if (!abort_if_unrecognized) { | |
525 // caller wants another chance, so give it to him | |
526 return false; | |
527 } | |
528 | |
529 if (pc == NULL && uc != NULL) { | |
530 pc = os::Linux::ucontext_get_pc(uc); | |
531 } | |
532 | |
533 // unmask current signal | |
534 sigset_t newset; | |
535 sigemptyset(&newset); | |
536 sigaddset(&newset, sig); | |
537 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
538 | |
539 VMError err(t, sig, pc, info, ucVoid); | |
540 err.report_and_die(); | |
541 | |
542 ShouldNotReachHere(); | |
543 } | |
544 | |
545 void os::Linux::init_thread_fpu_state(void) { | |
546 #ifndef AMD64 | |
547 // set fpu to 53 bit precision | |
548 set_fpu_control_word(0x27f); | |
549 #endif // !AMD64 | |
550 } | |
551 | |
552 int os::Linux::get_fpu_control_word(void) { | |
553 #ifdef AMD64 | |
554 return 0; | |
555 #else | |
556 int fpu_control; | |
557 _FPU_GETCW(fpu_control); | |
558 return fpu_control & 0xffff; | |
559 #endif // AMD64 | |
560 } | |
561 | |
562 void os::Linux::set_fpu_control_word(int fpu_control) { | |
563 #ifndef AMD64 | |
564 _FPU_SETCW(fpu_control); | |
565 #endif // !AMD64 | |
566 } | |
567 | |
568 // Check that the linux kernel version is 2.4 or higher since earlier | |
569 // versions do not support SSE without patches. | |
570 bool os::supports_sse() { | |
571 #ifdef AMD64 | |
572 return true; | |
573 #else | |
574 struct utsname uts; | |
575 if( uname(&uts) != 0 ) return false; // uname fails? | |
576 char *minor_string; | |
577 int major = strtol(uts.release,&minor_string,10); | |
578 int minor = strtol(minor_string+1,NULL,10); | |
579 bool result = (major > 2 || (major==2 && minor >= 4)); | |
580 #ifndef PRODUCT | |
581 if (PrintMiscellaneous && Verbose) { | |
582 tty->print("OS version is %d.%d, which %s support SSE/SSE2\n", | |
583 major,minor, result ? "DOES" : "does NOT"); | |
584 } | |
585 #endif | |
586 return result; | |
587 #endif // AMD64 | |
588 } | |
589 | |
590 bool os::is_allocatable(size_t bytes) { | |
591 #ifdef AMD64 | |
592 // unused on amd64? | |
593 return true; | |
594 #else | |
595 | |
596 if (bytes < 2 * G) { | |
597 return true; | |
598 } | |
599 | |
600 char* addr = reserve_memory(bytes, NULL); | |
601 | |
602 if (addr != NULL) { | |
603 release_memory(addr, bytes); | |
604 } | |
605 | |
606 return addr != NULL; | |
607 #endif // AMD64 | |
608 } | |
609 | |
610 //////////////////////////////////////////////////////////////////////////////// | |
611 // thread stack | |
612 | |
613 #ifdef AMD64 | |
614 size_t os::Linux::min_stack_allowed = 64 * K; | |
615 | |
616 // amd64: pthread on amd64 is always in floating stack mode | |
617 bool os::Linux::supports_variable_stack_size() { return true; } | |
618 #else | |
619 size_t os::Linux::min_stack_allowed = (48 DEBUG_ONLY(+4))*K; | |
620 | |
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621 #ifdef __GNUC__ |
0 | 622 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;}) |
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623 #endif |
0 | 624 |
625 // Test if pthread library can support variable thread stack size. LinuxThreads | |
626 // in fixed stack mode allocates 2M fixed slot for each thread. LinuxThreads | |
627 // in floating stack mode and NPTL support variable stack size. | |
628 bool os::Linux::supports_variable_stack_size() { | |
629 if (os::Linux::is_NPTL()) { | |
630 // NPTL, yes | |
631 return true; | |
632 | |
633 } else { | |
634 // Note: We can't control default stack size when creating a thread. | |
635 // If we use non-default stack size (pthread_attr_setstacksize), both | |
636 // floating stack and non-floating stack LinuxThreads will return the | |
637 // same value. This makes it impossible to implement this function by | |
638 // detecting thread stack size directly. | |
639 // | |
640 // An alternative approach is to check %gs. Fixed-stack LinuxThreads | |
641 // do not use %gs, so its value is 0. Floating-stack LinuxThreads use | |
642 // %gs (either as LDT selector or GDT selector, depending on kernel) | |
643 // to access thread specific data. | |
644 // | |
645 // Note that %gs is a reserved glibc register since early 2001, so | |
646 // applications are not allowed to change its value (Ulrich Drepper from | |
647 // Redhat confirmed that all known offenders have been modified to use | |
648 // either %fs or TSD). In the worst case scenario, when VM is embedded in | |
649 // a native application that plays with %gs, we might see non-zero %gs | |
650 // even LinuxThreads is running in fixed stack mode. As the result, we'll | |
651 // return true and skip _thread_safety_check(), so we may not be able to | |
652 // detect stack-heap collisions. But otherwise it's harmless. | |
653 // | |
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654 #ifdef __GNUC__ |
0 | 655 return (GET_GS() != 0); |
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656 #else |
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657 return false; |
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658 #endif |
0 | 659 } |
660 } | |
661 #endif // AMD64 | |
662 | |
663 // return default stack size for thr_type | |
664 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
665 // default stack size (compiler thread needs larger stack) | |
666 #ifdef AMD64 | |
667 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
668 #else | |
669 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); | |
670 #endif // AMD64 | |
671 return s; | |
672 } | |
673 | |
674 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
675 // Creating guard page is very expensive. Java thread has HotSpot | |
676 // guard page, only enable glibc guard page for non-Java threads. | |
677 return (thr_type == java_thread ? 0 : page_size()); | |
678 } | |
679 | |
680 // Java thread: | |
681 // | |
682 // Low memory addresses | |
683 // +------------------------+ | |
684 // | |\ JavaThread created by VM does not have glibc | |
685 // | glibc guard page | - guard, attached Java thread usually has | |
686 // | |/ 1 page glibc guard. | |
687 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() | |
688 // | |\ | |
689 // | HotSpot Guard Pages | - red and yellow pages | |
690 // | |/ | |
691 // +------------------------+ JavaThread::stack_yellow_zone_base() | |
692 // | |\ | |
693 // | Normal Stack | - | |
694 // | |/ | |
695 // P2 +------------------------+ Thread::stack_base() | |
696 // | |
697 // Non-Java thread: | |
698 // | |
699 // Low memory addresses | |
700 // +------------------------+ | |
701 // | |\ | |
702 // | glibc guard page | - usually 1 page | |
703 // | |/ | |
704 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() | |
705 // | |\ | |
706 // | Normal Stack | - | |
707 // | |/ | |
708 // P2 +------------------------+ Thread::stack_base() | |
709 // | |
710 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from | |
711 // pthread_attr_getstack() | |
712 | |
713 static void current_stack_region(address * bottom, size_t * size) { | |
714 if (os::Linux::is_initial_thread()) { | |
715 // initial thread needs special handling because pthread_getattr_np() | |
716 // may return bogus value. | |
717 *bottom = os::Linux::initial_thread_stack_bottom(); | |
718 *size = os::Linux::initial_thread_stack_size(); | |
719 } else { | |
720 pthread_attr_t attr; | |
721 | |
722 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
723 | |
724 // JVM needs to know exact stack location, abort if it fails | |
725 if (rslt != 0) { | |
726 if (rslt == ENOMEM) { | |
727 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
728 } else { | |
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729 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
0 | 730 } |
731 } | |
732 | |
733 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { | |
734 fatal("Can not locate current stack attributes!"); | |
735 } | |
736 | |
737 pthread_attr_destroy(&attr); | |
738 | |
739 } | |
740 assert(os::current_stack_pointer() >= *bottom && | |
741 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
742 } | |
743 | |
744 address os::current_stack_base() { | |
745 address bottom; | |
746 size_t size; | |
747 current_stack_region(&bottom, &size); | |
748 return (bottom + size); | |
749 } | |
750 | |
751 size_t os::current_stack_size() { | |
752 // stack size includes normal stack and HotSpot guard pages | |
753 address bottom; | |
754 size_t size; | |
755 current_stack_region(&bottom, &size); | |
756 return size; | |
757 } | |
758 | |
759 ///////////////////////////////////////////////////////////////////////////// | |
760 // helper functions for fatal error handler | |
761 | |
762 void os::print_context(outputStream *st, void *context) { | |
763 if (context == NULL) return; | |
764 | |
765 ucontext_t *uc = (ucontext_t*)context; | |
766 st->print_cr("Registers:"); | |
767 #ifdef AMD64 | |
768 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); | |
769 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); | |
770 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); | |
771 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); | |
772 st->cr(); | |
773 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); | |
774 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); | |
775 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); | |
776 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); | |
777 st->cr(); | |
778 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); | |
779 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); | |
780 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); | |
781 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); | |
782 st->cr(); | |
783 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); | |
784 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); | |
785 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); | |
786 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); | |
787 st->cr(); | |
788 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); | |
1907 | 789 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); |
0 | 790 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]); |
791 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]); | |
792 st->cr(); | |
793 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]); | |
794 #else | |
795 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EAX]); | |
796 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EBX]); | |
797 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ECX]); | |
798 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EDX]); | |
799 st->cr(); | |
800 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_UESP]); | |
801 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EBP]); | |
802 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ESI]); | |
803 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EDI]); | |
804 st->cr(); | |
805 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EIP]); | |
1907 | 806 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); |
0 | 807 st->print(", CR2=" INTPTR_FORMAT, uc->uc_mcontext.cr2); |
808 #endif // AMD64 | |
809 st->cr(); | |
810 st->cr(); | |
811 | |
812 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
813 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
814 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); | |
815 st->cr(); | |
816 | |
817 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
818 // point to garbage if entry point in an nmethod is corrupted. Leave | |
819 // this at the end, and hope for the best. | |
820 address pc = os::Linux::ucontext_get_pc(uc); | |
821 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
1907 | 822 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
823 } | |
824 | |
825 void os::print_register_info(outputStream *st, void *context) { | |
826 if (context == NULL) return; | |
827 | |
828 ucontext_t *uc = (ucontext_t*)context; | |
829 | |
830 st->print_cr("Register to memory mapping:"); | |
831 st->cr(); | |
832 | |
833 // this is horrendously verbose but the layout of the registers in the | |
834 // context does not match how we defined our abstract Register set, so | |
835 // we can't just iterate through the gregs area | |
836 | |
837 // this is only for the "general purpose" registers | |
838 | |
839 #ifdef AMD64 | |
840 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); | |
841 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); | |
842 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); | |
843 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); | |
844 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); | |
845 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); | |
846 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); | |
847 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); | |
848 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); | |
849 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); | |
850 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); | |
851 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); | |
852 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); | |
853 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); | |
854 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); | |
855 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); | |
856 #else | |
857 st->print("EAX="); print_location(st, uc->uc_mcontext.gregs[REG_EAX]); | |
858 st->print("EBX="); print_location(st, uc->uc_mcontext.gregs[REG_EBX]); | |
859 st->print("ECX="); print_location(st, uc->uc_mcontext.gregs[REG_ECX]); | |
860 st->print("EDX="); print_location(st, uc->uc_mcontext.gregs[REG_EDX]); | |
861 st->print("ESP="); print_location(st, uc->uc_mcontext.gregs[REG_ESP]); | |
862 st->print("EBP="); print_location(st, uc->uc_mcontext.gregs[REG_EBP]); | |
863 st->print("ESI="); print_location(st, uc->uc_mcontext.gregs[REG_ESI]); | |
864 st->print("EDI="); print_location(st, uc->uc_mcontext.gregs[REG_EDI]); | |
865 #endif // AMD64 | |
866 | |
867 st->cr(); | |
0 | 868 } |
869 | |
870 void os::setup_fpu() { | |
871 #ifndef AMD64 | |
872 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); | |
873 __asm__ volatile ( "fldcw (%0)" : | |
874 : "r" (fpu_cntrl) : "memory"); | |
875 #endif // !AMD64 | |
876 } | |
5903
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877 |
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878 #ifndef PRODUCT |
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879 void os::verify_stack_alignment() { |
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880 #ifdef AMD64 |
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881 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); |
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882 #endif |
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883 } |
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884 #endif |