Mercurial > hg > truffle
annotate src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp @ 1490:f03d0a26bf83
6888954: argument formatting for assert() and friends
Reviewed-by: kvn, twisti, apetrusenko, never, dcubed
| author | jcoomes |
|---|---|
| date | Thu, 22 Apr 2010 13:23:15 -0700 |
| parents | d1605aabd0a1 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 133 | 1 /* |
| 196 | 2 * Copyright 1999-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // do not include precompiled header file | |
| 26 | |
| 27 #include "incls/_os_linux_sparc.cpp.incl" | |
| 28 | |
| 29 // Linux/Sparc has rather obscure naming of registers in sigcontext | |
| 30 // different between 32 and 64 bits | |
| 31 #ifdef _LP64 | |
| 32 #define SIG_PC(x) ((x)->sigc_regs.tpc) | |
| 33 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) | |
| 34 #define SIG_REGS(x) ((x)->sigc_regs) | |
| 35 #else | |
| 36 #define SIG_PC(x) ((x)->si_regs.pc) | |
| 37 #define SIG_NPC(x) ((x)->si_regs.npc) | |
| 38 #define SIG_REGS(x) ((x)->si_regs) | |
| 39 #endif | |
| 40 | |
| 41 // those are to reference registers in sigcontext | |
| 42 enum { | |
| 43 CON_G0 = 0, | |
| 44 CON_G1, | |
| 45 CON_G2, | |
| 46 CON_G3, | |
| 47 CON_G4, | |
| 48 CON_G5, | |
| 49 CON_G6, | |
| 50 CON_G7, | |
| 51 CON_O0, | |
| 52 CON_O1, | |
| 53 CON_O2, | |
| 54 CON_O3, | |
| 55 CON_O4, | |
| 56 CON_O5, | |
| 57 CON_O6, | |
| 58 CON_O7, | |
| 59 }; | |
| 60 | |
| 61 static inline void set_cont_address(sigcontext* ctx, address addr) { | |
| 62 SIG_PC(ctx) = (intptr_t)addr; | |
| 63 SIG_NPC(ctx) = (intptr_t)(addr+4); | |
| 64 } | |
| 65 | |
| 66 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is | |
| 67 // currently interrupted by SIGPROF. | |
| 68 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested | |
| 69 // signal frames. Currently we don't do that on Linux, so it's the | |
| 70 // same as os::fetch_frame_from_context(). | |
| 71 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, | |
| 72 ucontext_t* uc, | |
| 73 intptr_t** ret_sp, | |
| 74 intptr_t** ret_fp) { | |
| 75 assert(thread != NULL, "just checking"); | |
| 76 assert(ret_sp != NULL, "just checking"); | |
| 77 assert(ret_fp != NULL, "just checking"); | |
| 78 | |
| 79 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); | |
| 80 } | |
| 81 | |
| 82 ExtendedPC os::fetch_frame_from_context(void* ucVoid, | |
| 83 intptr_t** ret_sp, | |
| 84 intptr_t** ret_fp) { | |
| 85 ucontext_t* uc = (ucontext_t*) ucVoid; | |
| 86 ExtendedPC epc; | |
| 87 | |
| 88 if (uc != NULL) { | |
| 89 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); | |
| 90 if (ret_sp) { | |
| 91 *ret_sp = os::Linux::ucontext_get_sp(uc); | |
| 92 } | |
| 93 if (ret_fp) { | |
| 94 *ret_fp = os::Linux::ucontext_get_fp(uc); | |
| 95 } | |
| 96 } else { | |
| 97 // construct empty ExtendedPC for return value checking | |
| 98 epc = ExtendedPC(NULL); | |
| 99 if (ret_sp) { | |
| 100 *ret_sp = (intptr_t*) NULL; | |
| 101 } | |
| 102 if (ret_fp) { | |
| 103 *ret_fp = (intptr_t*) NULL; | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 return epc; | |
| 108 } | |
| 109 | |
| 110 frame os::fetch_frame_from_context(void* ucVoid) { | |
| 111 intptr_t* sp; | |
| 112 intptr_t* fp; | |
| 113 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); | |
| 114 return frame(sp, fp, epc.pc()); | |
| 115 } | |
| 116 | |
| 117 frame os::get_sender_for_C_frame(frame* fr) { | |
| 118 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); | |
| 119 } | |
| 120 | |
| 121 frame os::current_frame() { | |
| 122 fprintf(stderr, "current_frame()"); | |
| 123 | |
| 124 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); | |
| 125 frame myframe(sp, frame::unpatchable, | |
| 126 CAST_FROM_FN_PTR(address, os::current_frame)); | |
| 127 if (os::is_first_C_frame(&myframe)) { | |
| 128 // stack is not walkable | |
| 129 return frame(NULL, frame::unpatchable, NULL); | |
| 130 } else { | |
| 131 return os::get_sender_for_C_frame(&myframe); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 address os::current_stack_pointer() { | |
| 136 register void *sp __asm__ ("sp"); | |
| 137 return (address)sp; | |
| 138 } | |
| 139 | |
| 140 static void current_stack_region(address* bottom, size_t* size) { | |
| 141 if (os::Linux::is_initial_thread()) { | |
| 142 // initial thread needs special handling because pthread_getattr_np() | |
| 143 // may return bogus value. | |
| 144 *bottom = os::Linux::initial_thread_stack_bottom(); | |
| 145 *size = os::Linux::initial_thread_stack_size(); | |
| 146 } else { | |
| 147 pthread_attr_t attr; | |
| 148 | |
| 149 int rslt = pthread_getattr_np(pthread_self(), &attr); | |
| 150 | |
| 151 // JVM needs to know exact stack location, abort if it fails | |
| 152 if (rslt != 0) { | |
| 153 if (rslt == ENOMEM) { | |
| 154 vm_exit_out_of_memory(0, "pthread_getattr_np"); | |
| 155 } else { | |
|
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
196
diff
changeset
|
156 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
| 133 | 157 } |
| 158 } | |
| 159 | |
| 160 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { | |
| 161 fatal("Can not locate current stack attributes!"); | |
| 162 } | |
| 163 | |
| 164 pthread_attr_destroy(&attr); | |
| 165 } | |
| 166 assert(os::current_stack_pointer() >= *bottom && | |
| 167 os::current_stack_pointer() < *bottom + *size, "just checking"); | |
| 168 } | |
| 169 | |
| 170 address os::current_stack_base() { | |
| 171 address bottom; | |
| 172 size_t size; | |
| 173 current_stack_region(&bottom, &size); | |
| 174 return bottom + size; | |
| 175 } | |
| 176 | |
| 177 size_t os::current_stack_size() { | |
| 178 // stack size includes normal stack and HotSpot guard pages | |
| 179 address bottom; | |
| 180 size_t size; | |
| 181 current_stack_region(&bottom, &size); | |
| 182 return size; | |
| 183 } | |
| 184 | |
| 185 char* os::non_memory_address_word() { | |
| 186 // Must never look like an address returned by reserve_memory, | |
| 187 // even in its subfields (as defined by the CPU immediate fields, | |
| 188 // if the CPU splits constants across multiple instructions). | |
| 189 // On SPARC, 0 != %hi(any real address), because there is no | |
| 190 // allocation in the first 1Kb of the virtual address space. | |
| 191 return (char*) 0; | |
| 192 } | |
| 193 | |
| 194 void os::initialize_thread() {} | |
| 195 | |
| 196 void os::print_context(outputStream *st, void *context) { | |
| 197 if (context == NULL) return; | |
| 198 | |
| 199 ucontext_t* uc = (ucontext_t*)context; | |
| 200 sigcontext* sc = (sigcontext*)context; | |
| 201 st->print_cr("Registers:"); | |
| 202 | |
| 203 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT | |
| 204 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, | |
| 205 SIG_REGS(sc).u_regs[CON_O0], | |
| 206 SIG_REGS(sc).u_regs[CON_O1], | |
| 207 SIG_REGS(sc).u_regs[CON_O2], | |
| 208 SIG_REGS(sc).u_regs[CON_O3]); | |
| 209 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT | |
| 210 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, | |
| 211 SIG_REGS(sc).u_regs[CON_O4], | |
| 212 SIG_REGS(sc).u_regs[CON_O5], | |
| 213 SIG_REGS(sc).u_regs[CON_O6], | |
| 214 SIG_REGS(sc).u_regs[CON_O7]); | |
| 215 | |
| 216 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT | |
| 217 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, | |
| 218 SIG_REGS(sc).u_regs[CON_G1], | |
| 219 SIG_REGS(sc).u_regs[CON_G2], | |
| 220 SIG_REGS(sc).u_regs[CON_G3], | |
| 221 SIG_REGS(sc).u_regs[CON_G4]); | |
| 222 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT | |
| 223 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, | |
| 224 SIG_REGS(sc).u_regs[CON_G5], | |
| 225 SIG_REGS(sc).u_regs[CON_G6], | |
| 226 SIG_REGS(sc).u_regs[CON_G7], | |
| 227 SIG_REGS(sc).y); | |
| 228 | |
| 229 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, | |
| 230 SIG_PC(sc), | |
| 231 SIG_NPC(sc)); | |
| 232 st->cr(); | |
| 233 st->cr(); | |
| 234 | |
| 235 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); | |
| 236 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); | |
| 237 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); | |
| 238 st->cr(); | |
| 239 | |
| 240 // Note: it may be unsafe to inspect memory near pc. For example, pc may | |
| 241 // point to garbage if entry point in an nmethod is corrupted. Leave | |
| 242 // this at the end, and hope for the best. | |
| 243 address pc = os::Linux::ucontext_get_pc(uc); | |
| 244 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); | |
| 245 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); | |
| 246 } | |
| 247 | |
| 248 | |
| 249 address os::Linux::ucontext_get_pc(ucontext_t* uc) { | |
| 250 return (address) SIG_PC((sigcontext*)uc); | |
| 251 } | |
| 252 | |
| 253 intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { | |
| 254 return (intptr_t*) | |
| 255 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); | |
| 256 } | |
| 257 | |
| 258 // not used on Sparc | |
| 259 intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { | |
| 260 ShouldNotReachHere(); | |
| 261 return NULL; | |
| 262 } | |
| 263 | |
| 264 // Utility functions | |
| 265 | |
| 266 extern "C" void Fetch32PFI(); | |
| 267 extern "C" void Fetch32Resume(); | |
| 268 extern "C" void FetchNPFI(); | |
| 269 extern "C" void FetchNResume(); | |
| 270 | |
| 271 inline static bool checkPrefetch(sigcontext* uc, address pc) { | |
| 272 if (pc == (address) Fetch32PFI) { | |
| 273 set_cont_address(uc, address(Fetch32Resume)); | |
| 274 return true; | |
| 275 } | |
| 276 if (pc == (address) FetchNPFI) { | |
| 277 set_cont_address(uc, address(FetchNResume)); | |
| 278 return true; | |
| 279 } | |
| 280 return false; | |
| 281 } | |
| 282 | |
| 283 inline static bool checkOverflow(sigcontext* uc, | |
| 284 address pc, | |
| 285 address addr, | |
| 286 JavaThread* thread, | |
| 287 address* stub) { | |
| 288 // check if fault address is within thread stack | |
| 289 if (addr < thread->stack_base() && | |
| 290 addr >= thread->stack_base() - thread->stack_size()) { | |
| 291 // stack overflow | |
| 292 if (thread->in_stack_yellow_zone(addr)) { | |
| 293 thread->disable_stack_yellow_zone(); | |
| 294 if (thread->thread_state() == _thread_in_Java) { | |
| 295 // Throw a stack overflow exception. Guard pages will be reenabled | |
| 296 // while unwinding the stack. | |
| 297 *stub = | |
| 298 SharedRuntime::continuation_for_implicit_exception(thread, | |
| 299 pc, | |
| 300 SharedRuntime::STACK_OVERFLOW); | |
| 301 } else { | |
| 302 // Thread was in the vm or native code. Return and try to finish. | |
| 303 return true; | |
| 304 } | |
| 305 } else if (thread->in_stack_red_zone(addr)) { | |
| 306 // Fatal red zone violation. Disable the guard pages and fall through | |
| 307 // to handle_unexpected_exception way down below. | |
| 308 thread->disable_stack_red_zone(); | |
| 309 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); | |
| 310 } else { | |
| 311 // Accessing stack address below sp may cause SEGV if current | |
| 312 // thread has MAP_GROWSDOWN stack. This should only happen when | |
| 313 // current thread was created by user code with MAP_GROWSDOWN flag | |
| 314 // and then attached to VM. See notes in os_linux.cpp. | |
| 315 if (thread->osthread()->expanding_stack() == 0) { | |
| 316 thread->osthread()->set_expanding_stack(); | |
| 317 if (os::Linux::manually_expand_stack(thread, addr)) { | |
| 318 thread->osthread()->clear_expanding_stack(); | |
| 319 return true; | |
| 320 } | |
| 321 thread->osthread()->clear_expanding_stack(); | |
| 322 } else { | |
| 323 fatal("recursive segv. expanding stack."); | |
| 324 } | |
| 325 } | |
| 326 } | |
| 327 return false; | |
| 328 } | |
| 329 | |
| 330 inline static bool checkPollingPage(address pc, address fault, address* stub) { | |
| 331 if (fault == os::get_polling_page()) { | |
| 332 *stub = SharedRuntime::get_poll_stub(pc); | |
| 333 return true; | |
| 334 } | |
| 335 return false; | |
| 336 } | |
| 337 | |
| 338 inline static bool checkByteBuffer(address pc, address* stub) { | |
| 339 // BugId 4454115: A read from a MappedByteBuffer can fault | |
| 340 // here if the underlying file has been truncated. | |
| 341 // Do not crash the VM in such a case. | |
| 342 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
| 343 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; | |
| 344 if (nm != NULL && nm->has_unsafe_access()) { | |
| 345 *stub = StubRoutines::handler_for_unsafe_access(); | |
| 346 return true; | |
| 347 } | |
| 348 return false; | |
| 349 } | |
| 350 | |
| 351 inline static bool checkVerifyOops(address pc, address fault, address* stub) { | |
| 352 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] | |
| 353 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { | |
| 354 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; | |
| 355 warning("fixed up memory fault in +VerifyOops at address " | |
| 356 INTPTR_FORMAT, fault); | |
| 357 return true; | |
| 358 } | |
| 359 return false; | |
| 360 } | |
| 361 | |
| 362 inline static bool checkFPFault(address pc, int code, | |
| 363 JavaThread* thread, address* stub) { | |
| 364 if (code == FPE_INTDIV || code == FPE_FLTDIV) { | |
| 365 *stub = | |
| 366 SharedRuntime:: | |
| 367 continuation_for_implicit_exception(thread, | |
| 368 pc, | |
| 369 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); | |
| 370 return true; | |
| 371 } | |
| 372 return false; | |
| 373 } | |
| 374 | |
| 375 inline static bool checkNullPointer(address pc, intptr_t fault, | |
| 376 JavaThread* thread, address* stub) { | |
| 377 if (!MacroAssembler::needs_explicit_null_check(fault)) { | |
| 378 // Determination of interpreter/vtable stub/compiled code null | |
| 379 // exception | |
| 380 *stub = | |
| 381 SharedRuntime:: | |
| 382 continuation_for_implicit_exception(thread, pc, | |
| 383 SharedRuntime::IMPLICIT_NULL); | |
| 384 return true; | |
| 385 } | |
| 386 return false; | |
| 387 } | |
| 388 | |
| 389 inline static bool checkFastJNIAccess(address pc, address* stub) { | |
| 390 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
| 391 if (addr != (address)-1) { | |
| 392 *stub = addr; | |
| 393 return true; | |
| 394 } | |
| 395 return false; | |
| 396 } | |
| 397 | |
| 398 inline static bool checkSerializePage(JavaThread* thread, address addr) { | |
| 399 return os::is_memory_serialize_page(thread, addr); | |
| 400 } | |
| 401 | |
| 402 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { | |
| 403 if (nativeInstruction_at(*pc)->is_zombie()) { | |
| 404 // zombie method (ld [%g0],%o7 instruction) | |
| 405 *stub = SharedRuntime::get_handle_wrong_method_stub(); | |
| 406 | |
| 407 // At the stub it needs to look like a call from the caller of this | |
| 408 // method (not a call from the segv site). | |
| 409 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
| 410 return true; | |
| 411 } | |
| 412 return false; | |
| 413 } | |
| 414 | |
| 415 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { | |
| 416 #ifdef COMPILER2 | |
| 417 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { | |
| 418 #ifdef ASSERT | |
| 419 #ifdef TIERED | |
| 420 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); | |
| 421 assert(cb->is_compiled_by_c2(), "Wrong compiler"); | |
| 422 #endif // TIERED | |
| 423 #endif // ASSERT | |
| 424 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. | |
| 425 *stub = SharedRuntime::get_ic_miss_stub(); | |
| 426 // At the stub it needs to look like a call from the caller of this | |
| 427 // method (not a call from the segv site). | |
| 428 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; | |
| 429 return true; | |
| 430 } | |
| 431 #endif // COMPILER2 | |
| 432 return false; | |
| 433 } | |
| 434 | |
| 435 extern "C" int | |
| 436 JVM_handle_linux_signal(int sig, | |
| 437 siginfo_t* info, | |
| 438 void* ucVoid, | |
| 439 int abort_if_unrecognized) { | |
| 440 // in fact this isn't ucontext_t* at all, but struct sigcontext* | |
| 441 // but Linux porting layer uses ucontext_t, so to minimize code change | |
| 442 // we cast as needed | |
| 443 ucontext_t* ucFake = (ucontext_t*) ucVoid; | |
| 444 sigcontext* uc = (sigcontext*)ucVoid; | |
| 445 | |
| 446 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
| 447 | |
| 448 SignalHandlerMark shm(t); | |
| 449 | |
| 450 // Note: it's not uncommon that JNI code uses signal/sigset to install | |
| 451 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, | |
| 452 // or have a SIGILL handler when detecting CPU type). When that happens, | |
| 453 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To | |
| 454 // avoid unnecessary crash when libjsig is not preloaded, try handle signals | |
| 455 // that do not require siginfo/ucontext first. | |
| 456 | |
| 457 if (sig == SIGPIPE || sig == SIGXFSZ) { | |
| 458 // allow chained handler to go first | |
| 459 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
| 460 return true; | |
| 461 } else { | |
| 462 if (PrintMiscellaneous && (WizardMode || Verbose)) { | |
| 463 char buf[64]; | |
| 464 warning("Ignoring %s - see bugs 4229104 or 646499219", | |
| 465 os::exception_name(sig, buf, sizeof(buf))); | |
| 466 } | |
| 467 return true; | |
| 468 } | |
| 469 } | |
| 470 | |
| 471 JavaThread* thread = NULL; | |
| 472 VMThread* vmthread = NULL; | |
| 473 if (os::Linux::signal_handlers_are_installed) { | |
| 474 if (t != NULL ){ | |
| 475 if(t->is_Java_thread()) { | |
| 476 thread = (JavaThread*)t; | |
| 477 } | |
| 478 else if(t->is_VM_thread()){ | |
| 479 vmthread = (VMThread *)t; | |
| 480 } | |
| 481 } | |
| 482 } | |
| 483 | |
| 484 // decide if this trap can be handled by a stub | |
| 485 address stub = NULL; | |
| 486 address pc = NULL; | |
| 487 address npc = NULL; | |
| 488 | |
| 489 //%note os_trap_1 | |
| 490 if (info != NULL && uc != NULL && thread != NULL) { | |
| 491 pc = address(SIG_PC(uc)); | |
| 492 npc = address(SIG_NPC(uc)); | |
| 493 | |
| 494 // Check to see if we caught the safepoint code in the | |
| 495 // process of write protecting the memory serialization page. | |
| 496 // It write enables the page immediately after protecting it | |
| 497 // so we can just return to retry the write. | |
| 498 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { | |
| 499 // Block current thread until the memory serialize page permission restored. | |
| 500 os::block_on_serialize_page_trap(); | |
| 501 return 1; | |
| 502 } | |
| 503 | |
| 504 if (checkPrefetch(uc, pc)) { | |
| 505 return 1; | |
| 506 } | |
| 507 | |
| 508 // Handle ALL stack overflow variations here | |
| 509 if (sig == SIGSEGV) { | |
| 510 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { | |
| 511 return 1; | |
| 512 } | |
| 513 } | |
| 514 | |
| 515 if (sig == SIGBUS && | |
| 516 thread->thread_state() == _thread_in_vm && | |
| 517 thread->doing_unsafe_access()) { | |
| 518 stub = StubRoutines::handler_for_unsafe_access(); | |
| 519 } | |
| 520 | |
| 521 if (thread->thread_state() == _thread_in_Java) { | |
| 522 do { | |
| 523 // Java thread running in Java code => find exception handler if any | |
| 524 // a fault inside compiled code, the interpreter, or a stub | |
| 525 | |
| 526 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { | |
| 527 break; | |
| 528 } | |
| 529 | |
| 530 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { | |
| 531 break; | |
| 532 } | |
| 533 | |
| 534 if ((sig == SIGSEGV || sig == SIGBUS) && | |
| 535 checkVerifyOops(pc, (address)info->si_addr, &stub)) { | |
| 536 break; | |
| 537 } | |
| 538 | |
| 539 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { | |
| 540 break; | |
| 541 } | |
| 542 | |
| 543 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { | |
| 544 break; | |
| 545 } | |
| 546 | |
| 547 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { | |
| 548 break; | |
| 549 } | |
| 550 | |
| 551 if ((sig == SIGSEGV) && | |
| 552 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { | |
| 553 break; | |
| 554 } | |
| 555 } while (0); | |
| 556 | |
| 557 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in | |
| 558 // and the heap gets shrunk before the field access. | |
| 559 if ((sig == SIGSEGV) || (sig == SIGBUS)) { | |
| 560 checkFastJNIAccess(pc, &stub); | |
| 561 } | |
| 562 } | |
| 563 | |
| 564 if (stub != NULL) { | |
| 565 // save all thread context in case we need to restore it | |
| 566 thread->set_saved_exception_pc(pc); | |
| 567 thread->set_saved_exception_npc(npc); | |
| 568 set_cont_address(uc, stub); | |
| 569 return true; | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 // signal-chaining | |
| 574 if (os::Linux::chained_handler(sig, info, ucVoid)) { | |
| 575 return true; | |
| 576 } | |
| 577 | |
| 578 if (!abort_if_unrecognized) { | |
| 579 // caller wants another chance, so give it to him | |
| 580 return false; | |
| 581 } | |
| 582 | |
| 583 if (pc == NULL && uc != NULL) { | |
| 584 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); | |
| 585 } | |
| 586 | |
| 587 // unmask current signal | |
| 588 sigset_t newset; | |
| 589 sigemptyset(&newset); | |
| 590 sigaddset(&newset, sig); | |
| 591 sigprocmask(SIG_UNBLOCK, &newset, NULL); | |
| 592 | |
| 593 VMError err(t, sig, pc, info, ucVoid); | |
| 594 err.report_and_die(); | |
| 595 | |
| 596 ShouldNotReachHere(); | |
| 597 } | |
| 598 | |
| 599 void os::Linux::init_thread_fpu_state(void) { | |
| 600 // Nothing to do | |
| 601 } | |
| 602 | |
| 603 int os::Linux::get_fpu_control_word() { | |
| 604 return 0; | |
| 605 } | |
| 606 | |
| 607 void os::Linux::set_fpu_control_word(int fpu) { | |
| 608 // nothing | |
| 609 } | |
| 610 | |
| 611 bool os::is_allocatable(size_t bytes) { | |
| 612 #ifdef _LP64 | |
| 613 return true; | |
| 614 #else | |
| 615 if (bytes < 2 * G) { | |
| 616 return true; | |
| 617 } | |
| 618 | |
| 619 char* addr = reserve_memory(bytes, NULL); | |
| 620 | |
| 621 if (addr != NULL) { | |
| 622 release_memory(addr, bytes); | |
| 623 } | |
| 624 | |
| 625 return addr != NULL; | |
| 626 #endif // _LP64 | |
| 627 } | |
| 628 | |
| 629 /////////////////////////////////////////////////////////////////////////////// | |
| 630 // thread stack | |
| 631 | |
| 632 size_t os::Linux::min_stack_allowed = 128 * K; | |
| 633 | |
| 634 // pthread on Ubuntu is always in floating stack mode | |
| 635 bool os::Linux::supports_variable_stack_size() { return true; } | |
| 636 | |
| 637 // return default stack size for thr_type | |
| 638 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { | |
| 639 // default stack size (compiler thread needs larger stack) | |
| 640 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); | |
| 641 return s; | |
| 642 } | |
| 643 | |
| 644 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { | |
| 645 // Creating guard page is very expensive. Java thread has HotSpot | |
| 646 // guard page, only enable glibc guard page for non-Java threads. | |
| 647 return (thr_type == java_thread ? 0 : page_size()); | |
| 648 } |