Mercurial > hg > graal-compiler
annotate src/os_cpu/linux_x86/vm/os_linux_x86.cpp @ 1623:fcbb92a1ab3b
Merge
author | jrose |
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date | Tue, 29 Jun 2010 16:09:57 -0700 |
parents | c18cbe5936b8 |
children | 126ea7725993 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2009, 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 | |
25 // do not include precompiled header file | |
26 # include "incls/_os_linux_x86.cpp.incl" | |
27 | |
28 // put OS-includes here | |
29 # include <sys/types.h> | |
30 # include <sys/mman.h> | |
31 # include <pthread.h> | |
32 # include <signal.h> | |
33 # include <errno.h> | |
34 # include <dlfcn.h> | |
35 # include <stdlib.h> | |
36 # include <stdio.h> | |
37 # include <unistd.h> | |
38 # include <sys/resource.h> | |
39 # include <pthread.h> | |
40 # include <sys/stat.h> | |
41 # include <sys/time.h> | |
42 # include <sys/utsname.h> | |
43 # include <sys/socket.h> | |
44 # include <sys/wait.h> | |
45 # include <pwd.h> | |
46 # include <poll.h> | |
47 # include <ucontext.h> | |
48 # include <fpu_control.h> | |
49 | |
50 #ifdef AMD64 | |
51 #define REG_SP REG_RSP | |
52 #define REG_PC REG_RIP | |
53 #define REG_FP REG_RBP | |
54 #define SPELL_REG_SP "rsp" | |
55 #define SPELL_REG_FP "rbp" | |
56 #else | |
57 #define REG_SP REG_UESP | |
58 #define REG_PC REG_EIP | |
59 #define REG_FP REG_EBP | |
60 #define SPELL_REG_SP "esp" | |
61 #define SPELL_REG_FP "ebp" | |
62 #endif // AMD64 | |
63 | |
64 address os::current_stack_pointer() { | |
50
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65 #ifdef SPARC_WORKS |
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66 register void *esp; |
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67 __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp)); |
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68 return (address) ((char*)esp + sizeof(long)*2); |
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69 #else |
0 | 70 register void *esp __asm__ (SPELL_REG_SP); |
71 return (address) esp; | |
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72 #endif |
0 | 73 } |
74 | |
75 char* os::non_memory_address_word() { | |
76 // Must never look like an address returned by reserve_memory, | |
77 // even in its subfields (as defined by the CPU immediate fields, | |
78 // if the CPU splits constants across multiple instructions). | |
79 | |
80 return (char*) -1; | |
81 } | |
82 | |
83 void os::initialize_thread() { | |
84 // Nothing to do. | |
85 } | |
86 | |
87 address os::Linux::ucontext_get_pc(ucontext_t * uc) { | |
88 return (address)uc->uc_mcontext.gregs[REG_PC]; | |
89 } | |
90 | |
91 intptr_t* os::Linux::ucontext_get_sp(ucontext_t * uc) { | |
92 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; | |
93 } | |
94 | |
95 intptr_t* os::Linux::ucontext_get_fp(ucontext_t * uc) { | |
96 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; | |
97 } | |
98 | |
99 // For Forte Analyzer AsyncGetCallTrace profiling support - thread | |
100 // is currently interrupted by SIGPROF. | |
101 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal | |
102 // frames. Currently we don't do that on Linux, so it's the same as | |
103 // os::fetch_frame_from_context(). | |
104 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
105 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { | |
106 | |
107 assert(thread != NULL, "just checking"); | |
108 assert(ret_sp != NULL, "just checking"); | |
109 assert(ret_fp != NULL, "just checking"); | |
110 | |
111 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
112 } | |
113 | |
114 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
115 intptr_t** ret_sp, intptr_t** ret_fp) { | |
116 | |
117 ExtendedPC epc; | |
118 ucontext_t* uc = (ucontext_t*)ucVoid; | |
119 | |
120 if (uc != NULL) { | |
121 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
122 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); | |
123 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc); | |
124 } else { | |
125 // construct empty ExtendedPC for return value checking | |
126 epc = ExtendedPC(NULL); | |
127 if (ret_sp) *ret_sp = (intptr_t *)NULL; | |
128 if (ret_fp) *ret_fp = (intptr_t *)NULL; | |
129 } | |
130 | |
131 return epc; | |
132 } | |
133 | |
134 frame os::fetch_frame_from_context(void* ucVoid) { | |
135 intptr_t* sp; | |
136 intptr_t* fp; | |
137 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
138 return frame(sp, fp, epc.pc()); | |
139 } | |
140 | |
141 // By default, gcc always save frame pointer (%ebp/%rbp) on stack. It may get | |
142 // turned off by -fomit-frame-pointer, | |
143 frame os::get_sender_for_C_frame(frame* fr) { | |
144 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
145 } | |
146 | |
147 intptr_t* _get_previous_fp() { | |
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148 #ifdef SPARC_WORKS |
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149 register intptr_t **ebp; |
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150 __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp)); |
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151 #else |
0 | 152 register intptr_t **ebp __asm__ (SPELL_REG_FP); |
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153 #endif |
0 | 154 return (intptr_t*) *ebp; // we want what it points to. |
155 } | |
156 | |
157 | |
158 frame os::current_frame() { | |
159 intptr_t* fp = _get_previous_fp(); | |
160 frame myframe((intptr_t*)os::current_stack_pointer(), | |
161 (intptr_t*)fp, | |
162 CAST_FROM_FN_PTR(address, os::current_frame)); | |
163 if (os::is_first_C_frame(&myframe)) { | |
164 // stack is not walkable | |
165 return frame(NULL, NULL, NULL); | |
166 } else { | |
167 return os::get_sender_for_C_frame(&myframe); | |
168 } | |
169 } | |
170 | |
171 // Utility functions | |
172 | |
173 // From IA32 System Programming Guide | |
174 enum { | |
175 trap_page_fault = 0xE | |
176 }; | |
177 | |
178 extern "C" void Fetch32PFI () ; | |
179 extern "C" void Fetch32Resume () ; | |
180 #ifdef AMD64 | |
181 extern "C" void FetchNPFI () ; | |
182 extern "C" void FetchNResume () ; | |
183 #endif // AMD64 | |
184 | |
185 extern "C" int | |
186 JVM_handle_linux_signal(int sig, | |
187 siginfo_t* info, | |
188 void* ucVoid, | |
189 int abort_if_unrecognized) { | |
190 ucontext_t* uc = (ucontext_t*) ucVoid; | |
191 | |
192 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
193 | |
194 SignalHandlerMark shm(t); | |
195 | |
196 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
197 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
198 // or have a SIGILL handler when detecting CPU type). When that happens, | |
199 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
200 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
201 // that do not require siginfo/ucontext first. | |
202 | |
203 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
204 // allow chained handler to go first | |
205 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
206 return true; | |
207 } else { | |
208 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
209 char buf[64]; | |
210 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
211 os::exception_name(sig, buf, sizeof(buf))); | |
212 } | |
213 return true; | |
214 } | |
215 } | |
216 | |
217 JavaThread* thread = NULL; | |
218 VMThread* vmthread = NULL; | |
219 if (os::Linux::signal_handlers_are_installed) { | |
220 if (t != NULL ){ | |
221 if(t->is_Java_thread()) { | |
222 thread = (JavaThread*)t; | |
223 } | |
224 else if(t->is_VM_thread()){ | |
225 vmthread = (VMThread *)t; | |
226 } | |
227 } | |
228 } | |
229 /* | |
230 NOTE: does not seem to work on linux. | |
231 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { | |
232 // can't decode this kind of signal | |
233 info = NULL; | |
234 } else { | |
235 assert(sig == info->si_signo, "bad siginfo"); | |
236 } | |
237 */ | |
238 // decide if this trap can be handled by a stub | |
239 address stub = NULL; | |
240 | |
241 address pc = NULL; | |
242 | |
243 //%note os_trap_1 | |
244 if (info != NULL && uc != NULL && thread != NULL) { | |
245 pc = (address) os::Linux::ucontext_get_pc(uc); | |
246 | |
247 if (pc == (address) Fetch32PFI) { | |
248 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; | |
249 return 1 ; | |
250 } | |
251 #ifdef AMD64 | |
252 if (pc == (address) FetchNPFI) { | |
253 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ; | |
254 return 1 ; | |
255 } | |
256 #endif // AMD64 | |
257 | |
258 // Handle ALL stack overflow variations here | |
259 if (sig == SIGSEGV) { | |
260 address addr = (address) info->si_addr; | |
261 | |
262 // check if fault address is within thread stack | |
263 if (addr < thread->stack_base() && | |
264 addr >= thread->stack_base() - thread->stack_size()) { | |
265 // stack overflow | |
266 if (thread->in_stack_yellow_zone(addr)) { | |
267 thread->disable_stack_yellow_zone(); | |
268 if (thread->thread_state() == _thread_in_Java) { | |
269 // Throw a stack overflow exception. Guard pages will be reenabled | |
270 // while unwinding the stack. | |
271 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); | |
272 } else { | |
273 // Thread was in the vm or native code. Return and try to finish. | |
274 return 1; | |
275 } | |
276 } else if (thread->in_stack_red_zone(addr)) { | |
277 // Fatal red zone violation. Disable the guard pages and fall through | |
278 // to handle_unexpected_exception way down below. | |
279 thread->disable_stack_red_zone(); | |
280 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
281 } else { | |
282 // Accessing stack address below sp may cause SEGV if current | |
283 // thread has MAP_GROWSDOWN stack. This should only happen when | |
284 // current thread was created by user code with MAP_GROWSDOWN flag | |
285 // and then attached to VM. See notes in os_linux.cpp. | |
286 if (thread->osthread()->expanding_stack() == 0) { | |
287 thread->osthread()->set_expanding_stack(); | |
288 if (os::Linux::manually_expand_stack(thread, addr)) { | |
289 thread->osthread()->clear_expanding_stack(); | |
290 return 1; | |
291 } | |
292 thread->osthread()->clear_expanding_stack(); | |
293 } else { | |
294 fatal("recursive segv. expanding stack."); | |
295 } | |
296 } | |
297 } | |
298 } | |
299 | |
300 if (thread->thread_state() == _thread_in_Java) { | |
301 // Java thread running in Java code => find exception handler if any | |
302 // a fault inside compiled code, the interpreter, or a stub | |
303 | |
304 if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { | |
305 stub = SharedRuntime::get_poll_stub(pc); | |
306 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { | |
307 // BugId 4454115: A read from a MappedByteBuffer can fault | |
308 // here if the underlying file has been truncated. | |
309 // Do not crash the VM in such a case. | |
310 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
311 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
312 if (nm != NULL && nm->has_unsafe_access()) { | |
313 stub = StubRoutines::handler_for_unsafe_access(); | |
314 } | |
315 } | |
316 else | |
317 | |
318 #ifdef AMD64 | |
319 if (sig == SIGFPE && | |
320 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { | |
321 stub = | |
322 SharedRuntime:: | |
323 continuation_for_implicit_exception(thread, | |
324 pc, | |
325 SharedRuntime:: | |
326 IMPLICIT_DIVIDE_BY_ZERO); | |
327 #else | |
328 if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { | |
329 // HACK: si_code does not work on linux 2.2.12-20!!! | |
330 int op = pc[0]; | |
331 if (op == 0xDB) { | |
332 // FIST | |
333 // TODO: The encoding of D2I in i486.ad can cause an exception | |
334 // prior to the fist instruction if there was an invalid operation | |
335 // pending. We want to dismiss that exception. From the win_32 | |
336 // side it also seems that if it really was the fist causing | |
337 // the exception that we do the d2i by hand with different | |
338 // rounding. Seems kind of weird. | |
339 // NOTE: that we take the exception at the NEXT floating point instruction. | |
340 assert(pc[0] == 0xDB, "not a FIST opcode"); | |
341 assert(pc[1] == 0x14, "not a FIST opcode"); | |
342 assert(pc[2] == 0x24, "not a FIST opcode"); | |
343 return true; | |
344 } else if (op == 0xF7) { | |
345 // IDIV | |
346 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
347 } else { | |
348 // TODO: handle more cases if we are using other x86 instructions | |
349 // that can generate SIGFPE signal on linux. | |
350 tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); | |
351 fatal("please update this code."); | |
352 } | |
353 #endif // AMD64 | |
354 } else if (sig == SIGSEGV && | |
355 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { | |
356 // Determination of interpreter/vtable stub/compiled code null exception | |
357 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); | |
358 } | |
359 } else if (thread->thread_state() == _thread_in_vm && | |
360 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ | |
361 thread->doing_unsafe_access()) { | |
362 stub = StubRoutines::handler_for_unsafe_access(); | |
363 } | |
364 | |
365 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
366 // and the heap gets shrunk before the field access. | |
367 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
368 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
369 if (addr != (address)-1) { | |
370 stub = addr; | |
371 } | |
372 } | |
373 | |
374 // Check to see if we caught the safepoint code in the | |
375 // process of write protecting the memory serialization page. | |
376 // It write enables the page immediately after protecting it | |
377 // so we can just return to retry the write. | |
378 if ((sig == SIGSEGV) && | |
379 os::is_memory_serialize_page(thread, (address) info->si_addr)) { | |
380 // Block current thread until the memory serialize page permission restored. | |
381 os::block_on_serialize_page_trap(); | |
382 return true; | |
383 } | |
384 } | |
385 | |
386 #ifndef AMD64 | |
387 // Execution protection violation | |
388 // | |
389 // This should be kept as the last step in the triage. We don't | |
390 // have a dedicated trap number for a no-execute fault, so be | |
391 // conservative and allow other handlers the first shot. | |
392 // | |
393 // Note: We don't test that info->si_code == SEGV_ACCERR here. | |
394 // this si_code is so generic that it is almost meaningless; and | |
395 // the si_code for this condition may change in the future. | |
396 // Furthermore, a false-positive should be harmless. | |
397 if (UnguardOnExecutionViolation > 0 && | |
398 (sig == SIGSEGV || sig == SIGBUS) && | |
399 uc->uc_mcontext.gregs[REG_TRAPNO] == trap_page_fault) { | |
400 int page_size = os::vm_page_size(); | |
401 address addr = (address) info->si_addr; | |
402 address pc = os::Linux::ucontext_get_pc(uc); | |
403 // Make sure the pc and the faulting address are sane. | |
404 // | |
405 // If an instruction spans a page boundary, and the page containing | |
406 // the beginning of the instruction is executable but the following | |
407 // page is not, the pc and the faulting address might be slightly | |
408 // different - we still want to unguard the 2nd page in this case. | |
409 // | |
410 // 15 bytes seems to be a (very) safe value for max instruction size. | |
411 bool pc_is_near_addr = | |
412 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
413 bool instr_spans_page_boundary = | |
414 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
415 (intptr_t) page_size) > 0); | |
416 | |
417 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
418 static volatile address last_addr = | |
419 (address) os::non_memory_address_word(); | |
420 | |
421 // In conservative mode, don't unguard unless the address is in the VM | |
422 if (addr != last_addr && | |
423 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
424 | |
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425 // Set memory to RWX and retry |
0 | 426 address page_start = |
427 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
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428 bool res = os::protect_memory((char*) page_start, page_size, |
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429 os::MEM_PROT_RWX); |
0 | 430 |
431 if (PrintMiscellaneous && Verbose) { | |
432 char buf[256]; | |
433 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
434 "at " INTPTR_FORMAT | |
435 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, | |
436 page_start, (res ? "success" : "failed"), errno); | |
437 tty->print_raw_cr(buf); | |
438 } | |
439 stub = pc; | |
440 | |
441 // Set last_addr so if we fault again at the same address, we don't end | |
442 // up in an endless loop. | |
443 // | |
444 // There are two potential complications here. Two threads trapping at | |
445 // the same address at the same time could cause one of the threads to | |
446 // think it already unguarded, and abort the VM. Likely very rare. | |
447 // | |
448 // The other race involves two threads alternately trapping at | |
449 // different addresses and failing to unguard the page, resulting in | |
450 // an endless loop. This condition is probably even more unlikely than | |
451 // the first. | |
452 // | |
453 // Although both cases could be avoided by using locks or thread local | |
454 // last_addr, these solutions are unnecessary complication: this | |
455 // handler is a best-effort safety net, not a complete solution. It is | |
456 // disabled by default and should only be used as a workaround in case | |
457 // we missed any no-execute-unsafe VM code. | |
458 | |
459 last_addr = addr; | |
460 } | |
461 } | |
462 } | |
463 #endif // !AMD64 | |
464 | |
465 if (stub != NULL) { | |
466 // save all thread context in case we need to restore it | |
467 if (thread != NULL) thread->set_saved_exception_pc(pc); | |
468 | |
469 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub; | |
470 return true; | |
471 } | |
472 | |
473 // signal-chaining | |
474 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
475 return true; | |
476 } | |
477 | |
478 if (!abort_if_unrecognized) { | |
479 // caller wants another chance, so give it to him | |
480 return false; | |
481 } | |
482 | |
483 if (pc == NULL && uc != NULL) { | |
484 pc = os::Linux::ucontext_get_pc(uc); | |
485 } | |
486 | |
487 // unmask current signal | |
488 sigset_t newset; | |
489 sigemptyset(&newset); | |
490 sigaddset(&newset, sig); | |
491 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
492 | |
493 VMError err(t, sig, pc, info, ucVoid); | |
494 err.report_and_die(); | |
495 | |
496 ShouldNotReachHere(); | |
497 } | |
498 | |
499 void os::Linux::init_thread_fpu_state(void) { | |
500 #ifndef AMD64 | |
501 // set fpu to 53 bit precision | |
502 set_fpu_control_word(0x27f); | |
503 #endif // !AMD64 | |
504 } | |
505 | |
506 int os::Linux::get_fpu_control_word(void) { | |
507 #ifdef AMD64 | |
508 return 0; | |
509 #else | |
510 int fpu_control; | |
511 _FPU_GETCW(fpu_control); | |
512 return fpu_control & 0xffff; | |
513 #endif // AMD64 | |
514 } | |
515 | |
516 void os::Linux::set_fpu_control_word(int fpu_control) { | |
517 #ifndef AMD64 | |
518 _FPU_SETCW(fpu_control); | |
519 #endif // !AMD64 | |
520 } | |
521 | |
522 // Check that the linux kernel version is 2.4 or higher since earlier | |
523 // versions do not support SSE without patches. | |
524 bool os::supports_sse() { | |
525 #ifdef AMD64 | |
526 return true; | |
527 #else | |
528 struct utsname uts; | |
529 if( uname(&uts) != 0 ) return false; // uname fails? | |
530 char *minor_string; | |
531 int major = strtol(uts.release,&minor_string,10); | |
532 int minor = strtol(minor_string+1,NULL,10); | |
533 bool result = (major > 2 || (major==2 && minor >= 4)); | |
534 #ifndef PRODUCT | |
535 if (PrintMiscellaneous && Verbose) { | |
536 tty->print("OS version is %d.%d, which %s support SSE/SSE2\n", | |
537 major,minor, result ? "DOES" : "does NOT"); | |
538 } | |
539 #endif | |
540 return result; | |
541 #endif // AMD64 | |
542 } | |
543 | |
544 bool os::is_allocatable(size_t bytes) { | |
545 #ifdef AMD64 | |
546 // unused on amd64? | |
547 return true; | |
548 #else | |
549 | |
550 if (bytes < 2 * G) { | |
551 return true; | |
552 } | |
553 | |
554 char* addr = reserve_memory(bytes, NULL); | |
555 | |
556 if (addr != NULL) { | |
557 release_memory(addr, bytes); | |
558 } | |
559 | |
560 return addr != NULL; | |
561 #endif // AMD64 | |
562 } | |
563 | |
564 //////////////////////////////////////////////////////////////////////////////// | |
565 // thread stack | |
566 | |
567 #ifdef AMD64 | |
568 size_t os::Linux::min_stack_allowed = 64 * K; | |
569 | |
570 // amd64: pthread on amd64 is always in floating stack mode | |
571 bool os::Linux::supports_variable_stack_size() { return true; } | |
572 #else | |
573 size_t os::Linux::min_stack_allowed = (48 DEBUG_ONLY(+4))*K; | |
574 | |
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575 #ifdef __GNUC__ |
0 | 576 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;}) |
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577 #endif |
0 | 578 |
579 // Test if pthread library can support variable thread stack size. LinuxThreads | |
580 // in fixed stack mode allocates 2M fixed slot for each thread. LinuxThreads | |
581 // in floating stack mode and NPTL support variable stack size. | |
582 bool os::Linux::supports_variable_stack_size() { | |
583 if (os::Linux::is_NPTL()) { | |
584 // NPTL, yes | |
585 return true; | |
586 | |
587 } else { | |
588 // Note: We can't control default stack size when creating a thread. | |
589 // If we use non-default stack size (pthread_attr_setstacksize), both | |
590 // floating stack and non-floating stack LinuxThreads will return the | |
591 // same value. This makes it impossible to implement this function by | |
592 // detecting thread stack size directly. | |
593 // | |
594 // An alternative approach is to check %gs. Fixed-stack LinuxThreads | |
595 // do not use %gs, so its value is 0. Floating-stack LinuxThreads use | |
596 // %gs (either as LDT selector or GDT selector, depending on kernel) | |
597 // to access thread specific data. | |
598 // | |
599 // Note that %gs is a reserved glibc register since early 2001, so | |
600 // applications are not allowed to change its value (Ulrich Drepper from | |
601 // Redhat confirmed that all known offenders have been modified to use | |
602 // either %fs or TSD). In the worst case scenario, when VM is embedded in | |
603 // a native application that plays with %gs, we might see non-zero %gs | |
604 // even LinuxThreads is running in fixed stack mode. As the result, we'll | |
605 // return true and skip _thread_safety_check(), so we may not be able to | |
606 // detect stack-heap collisions. But otherwise it's harmless. | |
607 // | |
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608 #ifdef __GNUC__ |
0 | 609 return (GET_GS() != 0); |
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610 #else |
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611 return false; |
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612 #endif |
0 | 613 } |
614 } | |
615 #endif // AMD64 | |
616 | |
617 // return default stack size for thr_type | |
618 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
619 // default stack size (compiler thread needs larger stack) | |
620 #ifdef AMD64 | |
621 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
622 #else | |
623 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); | |
624 #endif // AMD64 | |
625 return s; | |
626 } | |
627 | |
628 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
629 // Creating guard page is very expensive. Java thread has HotSpot | |
630 // guard page, only enable glibc guard page for non-Java threads. | |
631 return (thr_type == java_thread ? 0 : page_size()); | |
632 } | |
633 | |
634 // Java thread: | |
635 // | |
636 // Low memory addresses | |
637 // +------------------------+ | |
638 // | |\ JavaThread created by VM does not have glibc | |
639 // | glibc guard page | - guard, attached Java thread usually has | |
640 // | |/ 1 page glibc guard. | |
641 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() | |
642 // | |\ | |
643 // | HotSpot Guard Pages | - red and yellow pages | |
644 // | |/ | |
645 // +------------------------+ JavaThread::stack_yellow_zone_base() | |
646 // | |\ | |
647 // | Normal Stack | - | |
648 // | |/ | |
649 // P2 +------------------------+ Thread::stack_base() | |
650 // | |
651 // Non-Java thread: | |
652 // | |
653 // Low memory addresses | |
654 // +------------------------+ | |
655 // | |\ | |
656 // | glibc guard page | - usually 1 page | |
657 // | |/ | |
658 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() | |
659 // | |\ | |
660 // | Normal Stack | - | |
661 // | |/ | |
662 // P2 +------------------------+ Thread::stack_base() | |
663 // | |
664 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from | |
665 // pthread_attr_getstack() | |
666 | |
667 static void current_stack_region(address * bottom, size_t * size) { | |
668 if (os::Linux::is_initial_thread()) { | |
669 // initial thread needs special handling because pthread_getattr_np() | |
670 // may return bogus value. | |
671 *bottom = os::Linux::initial_thread_stack_bottom(); | |
672 *size = os::Linux::initial_thread_stack_size(); | |
673 } else { | |
674 pthread_attr_t attr; | |
675 | |
676 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
677 | |
678 // JVM needs to know exact stack location, abort if it fails | |
679 if (rslt != 0) { | |
680 if (rslt == ENOMEM) { | |
681 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
682 } else { | |
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683 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
0 | 684 } |
685 } | |
686 | |
687 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { | |
688 fatal("Can not locate current stack attributes!"); | |
689 } | |
690 | |
691 pthread_attr_destroy(&attr); | |
692 | |
693 } | |
694 assert(os::current_stack_pointer() >= *bottom && | |
695 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
696 } | |
697 | |
698 address os::current_stack_base() { | |
699 address bottom; | |
700 size_t size; | |
701 current_stack_region(&bottom, &size); | |
702 return (bottom + size); | |
703 } | |
704 | |
705 size_t os::current_stack_size() { | |
706 // stack size includes normal stack and HotSpot guard pages | |
707 address bottom; | |
708 size_t size; | |
709 current_stack_region(&bottom, &size); | |
710 return size; | |
711 } | |
712 | |
713 ///////////////////////////////////////////////////////////////////////////// | |
714 // helper functions for fatal error handler | |
715 | |
716 void os::print_context(outputStream *st, void *context) { | |
717 if (context == NULL) return; | |
718 | |
719 ucontext_t *uc = (ucontext_t*)context; | |
720 st->print_cr("Registers:"); | |
721 #ifdef AMD64 | |
722 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); | |
723 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); | |
724 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); | |
725 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); | |
726 st->cr(); | |
727 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); | |
728 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); | |
729 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); | |
730 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); | |
731 st->cr(); | |
732 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); | |
733 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); | |
734 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); | |
735 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); | |
736 st->cr(); | |
737 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); | |
738 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); | |
739 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); | |
740 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); | |
741 st->cr(); | |
742 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); | |
743 st->print(", EFL=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); | |
744 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]); | |
745 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]); | |
746 st->cr(); | |
747 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]); | |
748 #else | |
749 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EAX]); | |
750 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EBX]); | |
751 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ECX]); | |
752 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EDX]); | |
753 st->cr(); | |
754 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_UESP]); | |
755 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EBP]); | |
756 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ESI]); | |
757 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EDI]); | |
758 st->cr(); | |
759 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EIP]); | |
760 st->print(", CR2=" INTPTR_FORMAT, uc->uc_mcontext.cr2); | |
761 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); | |
762 #endif // AMD64 | |
763 st->cr(); | |
764 st->cr(); | |
765 | |
766 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
767 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
768 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); | |
769 st->cr(); | |
770 | |
771 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
772 // point to garbage if entry point in an nmethod is corrupted. Leave | |
773 // this at the end, and hope for the best. | |
774 address pc = os::Linux::ucontext_get_pc(uc); | |
775 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
776 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); | |
777 } | |
778 | |
779 void os::setup_fpu() { | |
780 #ifndef AMD64 | |
781 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); | |
782 __asm__ volatile ( "fldcw (%0)" : | |
783 : "r" (fpu_cntrl) : "memory"); | |
784 #endif // !AMD64 | |
785 } |