1 /* 2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "asm/macroAssembler.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/codeCache.hpp" 31 #include "code/icBuffer.hpp" 32 #include "code/vtableStubs.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_linux.h" 35 #include "memory/allocation.inline.hpp" 36 #include "nativeInst_sparc.hpp" 37 #include "os_share_linux.hpp" 38 #include "prims/jniFastGetField.hpp" 39 #include "prims/jvm.h" 40 #include "prims/jvm_misc.hpp" 41 #include "runtime/arguments.hpp" 42 #include "runtime/extendedPC.hpp" 43 #include "runtime/frame.inline.hpp" 44 #include "runtime/interfaceSupport.hpp" 45 #include "runtime/java.hpp" 46 #include "runtime/javaCalls.hpp" 47 #include "runtime/mutexLocker.hpp" 48 #include "runtime/osThread.hpp" 49 #include "runtime/sharedRuntime.hpp" 50 #include "runtime/stubRoutines.hpp" 51 #include "runtime/thread.inline.hpp" 52 #include "runtime/timer.hpp" 53 #include "utilities/events.hpp" 54 #include "utilities/vmError.hpp" 55 56 // Linux/Sparc has rather obscure naming of registers in sigcontext 57 // different between 32 and 64 bits 58 #ifdef _LP64 59 #define SIG_PC(x) ((x)->sigc_regs.tpc) 60 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) 61 #define SIG_REGS(x) ((x)->sigc_regs) 62 #else 63 #define SIG_PC(x) ((x)->si_regs.pc) 64 #define SIG_NPC(x) ((x)->si_regs.npc) 65 #define SIG_REGS(x) ((x)->si_regs) 66 #endif 67 68 // those are to reference registers in sigcontext 69 enum { 70 CON_G0 = 0, 71 CON_G1, 72 CON_G2, 73 CON_G3, 74 CON_G4, 75 CON_G5, 76 CON_G6, 77 CON_G7, 78 CON_O0, 79 CON_O1, 80 CON_O2, 81 CON_O3, 82 CON_O4, 83 CON_O5, 84 CON_O6, 85 CON_O7, 86 }; 87 88 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 89 // currently interrupted by SIGPROF. 90 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested 91 // signal frames. Currently we don't do that on Linux, so it's the 92 // same as os::fetch_frame_from_context(). 93 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 94 const ucontext_t* uc, 95 intptr_t** ret_sp, 96 intptr_t** ret_fp) { 97 assert(thread != NULL, "just checking"); 98 assert(ret_sp != NULL, "just checking"); 99 assert(ret_fp != NULL, "just checking"); 100 101 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 102 } 103 104 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 105 intptr_t** ret_sp, 106 intptr_t** ret_fp) { 107 const ucontext_t* uc = (const ucontext_t*) ucVoid; 108 ExtendedPC epc; 109 110 if (uc != NULL) { 111 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 112 if (ret_sp) { 113 *ret_sp = os::Linux::ucontext_get_sp(uc); 114 } 115 if (ret_fp) { 116 *ret_fp = (intptr_t*)NULL; 117 } 118 } else { 119 // construct empty ExtendedPC for return value checking 120 epc = ExtendedPC(NULL); 121 if (ret_sp) { 122 *ret_sp = (intptr_t*) NULL; 123 } 124 if (ret_fp) { 125 *ret_fp = (intptr_t*) NULL; 126 } 127 } 128 129 return epc; 130 } 131 132 frame os::fetch_frame_from_context(const void* ucVoid) { 133 intptr_t* sp; 134 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); 135 return frame(sp, frame::unpatchable, epc.pc()); 136 } 137 138 frame os::get_sender_for_C_frame(frame* fr) { 139 return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); 140 } 141 142 frame os::current_frame() { 143 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 144 frame myframe(sp, frame::unpatchable, 145 CAST_FROM_FN_PTR(address, os::current_frame)); 146 if (os::is_first_C_frame(&myframe)) { 147 // stack is not walkable 148 return frame(NULL, frame::unpatchable, NULL); 149 } else { 150 return os::get_sender_for_C_frame(&myframe); 151 } 152 } 153 154 address os::current_stack_pointer() { 155 register void *sp __asm__ ("sp"); 156 return (address)sp; 157 } 158 159 char* os::non_memory_address_word() { 160 // Must never look like an address returned by reserve_memory, 161 // even in its subfields (as defined by the CPU immediate fields, 162 // if the CPU splits constants across multiple instructions). 163 // On SPARC, 0 != %hi(any real address), because there is no 164 // allocation in the first 1Kb of the virtual address space. 165 return (char*) 0; 166 } 167 168 void os::initialize_thread(Thread* thr) {} 169 170 void os::print_context(outputStream *st, const void *context) { 171 if (context == NULL) return; 172 173 const ucontext_t* uc = (const ucontext_t*)context; 174 sigcontext* sc = (sigcontext*)context; 175 st->print_cr("Registers:"); 176 177 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT 178 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, 179 SIG_REGS(sc).u_regs[CON_G1], 180 SIG_REGS(sc).u_regs[CON_G2], 181 SIG_REGS(sc).u_regs[CON_G3], 182 SIG_REGS(sc).u_regs[CON_G4]); 183 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT 184 " G7=" INTPTR_FORMAT " Y=0x%x", 185 SIG_REGS(sc).u_regs[CON_G5], 186 SIG_REGS(sc).u_regs[CON_G6], 187 SIG_REGS(sc).u_regs[CON_G7], 188 SIG_REGS(sc).y); 189 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT 190 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, 191 SIG_REGS(sc).u_regs[CON_O0], 192 SIG_REGS(sc).u_regs[CON_O1], 193 SIG_REGS(sc).u_regs[CON_O2], 194 SIG_REGS(sc).u_regs[CON_O3]); 195 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT 196 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, 197 SIG_REGS(sc).u_regs[CON_O4], 198 SIG_REGS(sc).u_regs[CON_O5], 199 SIG_REGS(sc).u_regs[CON_O6], 200 SIG_REGS(sc).u_regs[CON_O7]); 201 202 203 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 204 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT 205 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, 206 sp[L0->sp_offset_in_saved_window()], 207 sp[L1->sp_offset_in_saved_window()], 208 sp[L2->sp_offset_in_saved_window()], 209 sp[L3->sp_offset_in_saved_window()]); 210 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT 211 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, 212 sp[L4->sp_offset_in_saved_window()], 213 sp[L5->sp_offset_in_saved_window()], 214 sp[L6->sp_offset_in_saved_window()], 215 sp[L7->sp_offset_in_saved_window()]); 216 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT 217 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, 218 sp[I0->sp_offset_in_saved_window()], 219 sp[I1->sp_offset_in_saved_window()], 220 sp[I2->sp_offset_in_saved_window()], 221 sp[I3->sp_offset_in_saved_window()]); 222 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT 223 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, 224 sp[I4->sp_offset_in_saved_window()], 225 sp[I5->sp_offset_in_saved_window()], 226 sp[I6->sp_offset_in_saved_window()], 227 sp[I7->sp_offset_in_saved_window()]); 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 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); 236 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 237 st->cr(); 238 239 // Note: it may be unsafe to inspect memory near pc. For example, pc may 240 // point to garbage if entry point in an nmethod is corrupted. Leave 241 // this at the end, and hope for the best. 242 address pc = os::Linux::ucontext_get_pc(uc); 243 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); 244 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 245 } 246 247 248 void os::print_register_info(outputStream *st, const void *context) { 249 if (context == NULL) return; 250 251 const ucontext_t *uc = (const ucontext_t*)context; 252 const sigcontext* sc = (const sigcontext*)context; 253 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 254 255 st->print_cr("Register to memory mapping:"); 256 st->cr(); 257 258 // this is only for the "general purpose" registers 259 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); 260 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); 261 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); 262 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); 263 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); 264 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); 265 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); 266 st->cr(); 267 268 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); 269 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); 270 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); 271 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); 272 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); 273 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); 274 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); 275 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); 276 st->cr(); 277 278 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); 279 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); 280 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); 281 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); 282 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); 283 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); 284 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); 285 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); 286 st->cr(); 287 288 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); 289 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); 290 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); 291 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); 292 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); 293 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); 294 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); 295 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); 296 st->cr(); 297 } 298 299 300 address os::Linux::ucontext_get_pc(const ucontext_t* uc) { 301 return (address) SIG_PC((sigcontext*)uc); 302 } 303 304 void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { 305 sigcontext* ctx = (sigcontext*) uc; 306 SIG_PC(ctx) = (intptr_t)pc; 307 SIG_NPC(ctx) = (intptr_t)(pc+4); 308 } 309 310 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) { 311 return (intptr_t*) 312 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); 313 } 314 315 // not used on Sparc 316 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) { 317 ShouldNotReachHere(); 318 return NULL; 319 } 320 321 // Utility functions 322 323 inline static bool checkPrefetch(sigcontext* uc, address pc) { 324 if (StubRoutines::is_safefetch_fault(pc)) { 325 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc)); 326 return true; 327 } 328 return false; 329 } 330 331 inline static bool checkOverflow(sigcontext* uc, 332 address pc, 333 address addr, 334 JavaThread* thread, 335 address* stub) { 336 // check if fault address is within thread stack 337 if (thread->on_local_stack(addr)) { 338 // stack overflow 339 if (thread->in_stack_yellow_reserved_zone(addr)) { 340 thread->disable_stack_yellow_reserved_zone(); 341 if (thread->thread_state() == _thread_in_Java) { 342 // Throw a stack overflow exception. Guard pages will be reenabled 343 // while unwinding the stack. 344 *stub = 345 SharedRuntime::continuation_for_implicit_exception(thread, 346 pc, 347 SharedRuntime::STACK_OVERFLOW); 348 } else { 349 // Thread was in the vm or native code. Return and try to finish. 350 return true; 351 } 352 } else if (thread->in_stack_red_zone(addr)) { 353 // Fatal red zone violation. Disable the guard pages and fall through 354 // to handle_unexpected_exception way down below. 355 thread->disable_stack_red_zone(); 356 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 357 358 // This is a likely cause, but hard to verify. Let's just print 359 // it as a hint. 360 tty->print_raw_cr("Please check if any of your loaded .so files has " 361 "enabled executable stack (see man page execstack(8))"); 362 } else { 363 // Accessing stack address below sp may cause SEGV if current 364 // thread has MAP_GROWSDOWN stack. This should only happen when 365 // current thread was created by user code with MAP_GROWSDOWN flag 366 // and then attached to VM. See notes in os_linux.cpp. 367 if (thread->osthread()->expanding_stack() == 0) { 368 thread->osthread()->set_expanding_stack(); 369 if (os::Linux::manually_expand_stack(thread, addr)) { 370 thread->osthread()->clear_expanding_stack(); 371 return true; 372 } 373 thread->osthread()->clear_expanding_stack(); 374 } else { 375 fatal("recursive segv. expanding stack."); 376 } 377 } 378 } 379 return false; 380 } 381 382 inline static bool checkPollingPage(address pc, address fault, address* stub) { 383 if (fault == os::get_polling_page()) { 384 *stub = SharedRuntime::get_poll_stub(pc); 385 return true; 386 } 387 return false; 388 } 389 390 inline static bool checkByteBuffer(address pc, address npc, address* stub) { 391 // BugId 4454115: A read from a MappedByteBuffer can fault 392 // here if the underlying file has been truncated. 393 // Do not crash the VM in such a case. 394 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 395 CompiledMethod* nm = cb->as_compiled_method_or_null(); 396 if (nm != NULL && nm->has_unsafe_access()) { 397 *stub = SharedRuntime::handle_unsafe_access(thread, npc); 398 return true; 399 } 400 return false; 401 } 402 403 inline static bool checkVerifyOops(address pc, address fault, address* stub) { 404 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] 405 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { 406 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; 407 warning("fixed up memory fault in +VerifyOops at address " 408 INTPTR_FORMAT, p2i(fault)); 409 return true; 410 } 411 return false; 412 } 413 414 inline static bool checkFPFault(address pc, int code, 415 JavaThread* thread, address* stub) { 416 if (code == FPE_INTDIV || code == FPE_FLTDIV) { 417 *stub = 418 SharedRuntime:: 419 continuation_for_implicit_exception(thread, 420 pc, 421 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 422 return true; 423 } 424 return false; 425 } 426 427 inline static bool checkNullPointer(address pc, intptr_t fault, 428 JavaThread* thread, address* stub) { 429 if (!MacroAssembler::needs_explicit_null_check(fault)) { 430 // Determination of interpreter/vtable stub/compiled code null 431 // exception 432 *stub = 433 SharedRuntime:: 434 continuation_for_implicit_exception(thread, pc, 435 SharedRuntime::IMPLICIT_NULL); 436 return true; 437 } 438 return false; 439 } 440 441 inline static bool checkFastJNIAccess(address pc, address* stub) { 442 address addr = JNI_FastGetField::find_slowcase_pc(pc); 443 if (addr != (address)-1) { 444 *stub = addr; 445 return true; 446 } 447 return false; 448 } 449 450 inline static bool checkSerializePage(JavaThread* thread, address addr) { 451 return os::is_memory_serialize_page(thread, addr); 452 } 453 454 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { 455 if (nativeInstruction_at(*pc)->is_zombie()) { 456 // zombie method (ld [%g0],%o7 instruction) 457 *stub = SharedRuntime::get_handle_wrong_method_stub(); 458 459 // At the stub it needs to look like a call from the caller of this 460 // method (not a call from the segv site). 461 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 462 return true; 463 } 464 return false; 465 } 466 467 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { 468 #ifdef COMPILER2 469 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { 470 #ifdef ASSERT 471 #ifdef TIERED 472 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); 473 assert(cb->is_compiled_by_c2(), "Wrong compiler"); 474 #endif // TIERED 475 #endif // ASSERT 476 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. 477 *stub = SharedRuntime::get_ic_miss_stub(); 478 // At the stub it needs to look like a call from the caller of this 479 // method (not a call from the segv site). 480 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 481 return true; 482 } 483 #endif // COMPILER2 484 return false; 485 } 486 487 extern "C" JNIEXPORT int 488 JVM_handle_linux_signal(int sig, 489 siginfo_t* info, 490 void* ucVoid, 491 int abort_if_unrecognized) { 492 // in fact this isn't ucontext_t* at all, but struct sigcontext* 493 // but Linux porting layer uses ucontext_t, so to minimize code change 494 // we cast as needed 495 ucontext_t* ucFake = (ucontext_t*) ucVoid; 496 sigcontext* uc = (sigcontext*)ucVoid; 497 498 Thread* t = Thread::current_or_null_safe(); 499 500 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 501 // (no destructors can be run) 502 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 503 504 SignalHandlerMark shm(t); 505 506 // Note: it's not uncommon that JNI code uses signal/sigset to install 507 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 508 // or have a SIGILL handler when detecting CPU type). When that happens, 509 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 510 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 511 // that do not require siginfo/ucontext first. 512 513 if (sig == SIGPIPE || sig == SIGXFSZ) { 514 // allow chained handler to go first 515 if (os::Linux::chained_handler(sig, info, ucVoid)) { 516 return true; 517 } else { 518 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 519 return true; 520 } 521 } 522 523 JavaThread* thread = NULL; 524 VMThread* vmthread = NULL; 525 if (os::Linux::signal_handlers_are_installed) { 526 if (t != NULL ){ 527 if(t->is_Java_thread()) { 528 thread = (JavaThread*)t; 529 } 530 else if(t->is_VM_thread()){ 531 vmthread = (VMThread *)t; 532 } 533 } 534 } 535 536 // decide if this trap can be handled by a stub 537 address stub = NULL; 538 address pc = NULL; 539 address npc = NULL; 540 541 //%note os_trap_1 542 if (info != NULL && uc != NULL && thread != NULL) { 543 pc = address(SIG_PC(uc)); 544 npc = address(SIG_NPC(uc)); 545 546 // Check to see if we caught the safepoint code in the 547 // process of write protecting the memory serialization page. 548 // It write enables the page immediately after protecting it 549 // so we can just return to retry the write. 550 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { 551 // Block current thread until the memory serialize page permission restored. 552 os::block_on_serialize_page_trap(); 553 return 1; 554 } 555 556 if (checkPrefetch(uc, pc)) { 557 return 1; 558 } 559 560 // Handle ALL stack overflow variations here 561 if (sig == SIGSEGV) { 562 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { 563 return 1; 564 } 565 } 566 567 if (sig == SIGBUS && 568 thread->thread_state() == _thread_in_vm && 569 thread->doing_unsafe_access()) { 570 stub = SharedRuntime::handle_unsafe_access(thread, npc); 571 } 572 573 if (thread->thread_state() == _thread_in_Java) { 574 do { 575 // Java thread running in Java code => find exception handler if any 576 // a fault inside compiled code, the interpreter, or a stub 577 578 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { 579 break; 580 } 581 582 if ((sig == SIGBUS) && checkByteBuffer(pc, npc, &stub)) { 583 break; 584 } 585 586 if ((sig == SIGSEGV || sig == SIGBUS) && 587 checkVerifyOops(pc, (address)info->si_addr, &stub)) { 588 break; 589 } 590 591 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { 592 break; 593 } 594 595 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { 596 break; 597 } 598 599 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { 600 break; 601 } 602 603 if ((sig == SIGSEGV) && 604 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { 605 break; 606 } 607 } while (0); 608 609 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 610 // and the heap gets shrunk before the field access. 611 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 612 checkFastJNIAccess(pc, &stub); 613 } 614 } 615 616 if (stub != NULL) { 617 // save all thread context in case we need to restore it 618 thread->set_saved_exception_pc(pc); 619 thread->set_saved_exception_npc(npc); 620 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub); 621 return true; 622 } 623 } 624 625 // signal-chaining 626 if (os::Linux::chained_handler(sig, info, ucVoid)) { 627 return true; 628 } 629 630 if (!abort_if_unrecognized) { 631 // caller wants another chance, so give it to him 632 return false; 633 } 634 635 if (pc == NULL && uc != NULL) { 636 pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc); 637 } 638 639 // unmask current signal 640 sigset_t newset; 641 sigemptyset(&newset); 642 sigaddset(&newset, sig); 643 sigprocmask(SIG_UNBLOCK, &newset, NULL); 644 645 VMError::report_and_die(t, sig, pc, info, ucVoid); 646 647 ShouldNotReachHere(); 648 return false; 649 } 650 651 void os::Linux::init_thread_fpu_state(void) { 652 // Nothing to do 653 } 654 655 int os::Linux::get_fpu_control_word() { 656 return 0; 657 } 658 659 void os::Linux::set_fpu_control_word(int fpu) { 660 // nothing 661 } 662 663 bool os::is_allocatable(size_t bytes) { 664 #ifdef _LP64 665 return true; 666 #else 667 if (bytes < 2 * G) { 668 return true; 669 } 670 671 char* addr = reserve_memory(bytes, NULL); 672 673 if (addr != NULL) { 674 release_memory(addr, bytes); 675 } 676 677 return addr != NULL; 678 #endif // _LP64 679 } 680 681 /////////////////////////////////////////////////////////////////////////////// 682 // thread stack 683 684 // Minimum usable stack sizes required to get to user code. Space for 685 // HotSpot guard pages is added later. 686 size_t os::Posix::_compiler_thread_min_stack_allowed = 32 * K; 687 size_t os::Posix::_java_thread_min_stack_allowed = 32 * K; 688 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K; 689 690 // return default stack size for thr_type 691 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 692 // default stack size (compiler thread needs larger stack) 693 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 694 return s; 695 } 696 697 #ifndef PRODUCT 698 void os::verify_stack_alignment() { 699 } 700 #endif 701 702 int os::extra_bang_size_in_bytes() { 703 // SPARC does not require the additional stack bang. 704 return 0; 705 }