1 /* 2 * Copyright (c) 1999, 2017, 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 "jvm.h" 27 #include "asm/macroAssembler.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/codeCache.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "interpreter/interpreter.hpp" 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_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" 50 #include "runtime/thread.inline.hpp" 51 #include "runtime/timer.hpp" 52 #include "utilities/events.hpp" 53 #include "utilities/vmError.hpp" 54 55 // Linux/Sparc has rather obscure naming of registers in sigcontext 56 // different between 32 and 64 bits 57 #define SIG_PC(x) ((x)->sigc_regs.tpc) 58 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) 59 #define SIG_REGS(x) ((x)->sigc_regs) 60 61 // those are to reference registers in sigcontext 62 enum { 63 CON_G0 = 0, 64 CON_G1, 65 CON_G2, 66 CON_G3, 67 CON_G4, 68 CON_G5, 69 CON_G6, 70 CON_G7, 71 CON_O0, 72 CON_O1, 73 CON_O2, 74 CON_O3, 75 CON_O4, 76 CON_O5, 77 CON_O6, 78 CON_O7, 79 }; 80 81 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 82 // currently interrupted by SIGPROF. 83 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested 84 // signal frames. Currently we don't do that on Linux, so it's the 85 // same as os::fetch_frame_from_context(). 86 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 87 const ucontext_t* uc, 88 intptr_t** ret_sp, 89 intptr_t** ret_fp) { 90 assert(thread != NULL, "just checking"); 91 assert(ret_sp != NULL, "just checking"); 92 assert(ret_fp != NULL, "just checking"); 93 94 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 95 } 96 97 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 98 intptr_t** ret_sp, 99 intptr_t** ret_fp) { 100 const ucontext_t* uc = (const ucontext_t*) ucVoid; 101 ExtendedPC epc; 102 103 if (uc != NULL) { 104 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 105 if (ret_sp) { 106 *ret_sp = os::Linux::ucontext_get_sp(uc); 107 } 108 if (ret_fp) { 109 *ret_fp = (intptr_t*)NULL; 110 } 111 } else { 112 // construct empty ExtendedPC for return value checking 113 epc = ExtendedPC(NULL); 114 if (ret_sp) { 115 *ret_sp = (intptr_t*) NULL; 116 } 117 if (ret_fp) { 118 *ret_fp = (intptr_t*) NULL; 119 } 120 } 121 122 return epc; 123 } 124 125 frame os::fetch_frame_from_context(const void* ucVoid) { 126 intptr_t* sp; 127 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); 128 return frame(sp, frame::unpatchable, epc.pc()); 129 } 130 131 frame os::get_sender_for_C_frame(frame* fr) { 132 return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); 133 } 134 135 frame os::current_frame() { 136 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 137 frame myframe(sp, frame::unpatchable, 138 CAST_FROM_FN_PTR(address, os::current_frame)); 139 if (os::is_first_C_frame(&myframe)) { 140 // stack is not walkable 141 return frame(NULL, frame::unpatchable, NULL); 142 } else { 143 return os::get_sender_for_C_frame(&myframe); 144 } 145 } 146 147 address os::current_stack_pointer() { 148 register void *sp __asm__ ("sp"); 149 return (address)sp; 150 } 151 152 char* os::non_memory_address_word() { 153 // Must never look like an address returned by reserve_memory, 154 // even in its subfields (as defined by the CPU immediate fields, 155 // if the CPU splits constants across multiple instructions). 156 // On SPARC, 0 != %hi(any real address), because there is no 157 // allocation in the first 1Kb of the virtual address space. 158 return (char*) 0; 159 } 160 161 void os::initialize_thread(Thread* thr) {} 162 163 void os::print_context(outputStream *st, const void *context) { 164 if (context == NULL) return; 165 166 const ucontext_t* uc = (const ucontext_t*)context; 167 sigcontext* sc = (sigcontext*)context; 168 st->print_cr("Registers:"); 169 170 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT 171 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, 172 SIG_REGS(sc).u_regs[CON_G1], 173 SIG_REGS(sc).u_regs[CON_G2], 174 SIG_REGS(sc).u_regs[CON_G3], 175 SIG_REGS(sc).u_regs[CON_G4]); 176 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT 177 " G7=" INTPTR_FORMAT " Y=0x%x", 178 SIG_REGS(sc).u_regs[CON_G5], 179 SIG_REGS(sc).u_regs[CON_G6], 180 SIG_REGS(sc).u_regs[CON_G7], 181 SIG_REGS(sc).y); 182 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT 183 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, 184 SIG_REGS(sc).u_regs[CON_O0], 185 SIG_REGS(sc).u_regs[CON_O1], 186 SIG_REGS(sc).u_regs[CON_O2], 187 SIG_REGS(sc).u_regs[CON_O3]); 188 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT 189 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, 190 SIG_REGS(sc).u_regs[CON_O4], 191 SIG_REGS(sc).u_regs[CON_O5], 192 SIG_REGS(sc).u_regs[CON_O6], 193 SIG_REGS(sc).u_regs[CON_O7]); 194 195 196 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 197 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT 198 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, 199 sp[L0->sp_offset_in_saved_window()], 200 sp[L1->sp_offset_in_saved_window()], 201 sp[L2->sp_offset_in_saved_window()], 202 sp[L3->sp_offset_in_saved_window()]); 203 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT 204 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, 205 sp[L4->sp_offset_in_saved_window()], 206 sp[L5->sp_offset_in_saved_window()], 207 sp[L6->sp_offset_in_saved_window()], 208 sp[L7->sp_offset_in_saved_window()]); 209 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT 210 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, 211 sp[I0->sp_offset_in_saved_window()], 212 sp[I1->sp_offset_in_saved_window()], 213 sp[I2->sp_offset_in_saved_window()], 214 sp[I3->sp_offset_in_saved_window()]); 215 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT 216 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, 217 sp[I4->sp_offset_in_saved_window()], 218 sp[I5->sp_offset_in_saved_window()], 219 sp[I6->sp_offset_in_saved_window()], 220 sp[I7->sp_offset_in_saved_window()]); 221 222 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, 223 SIG_PC(sc), 224 SIG_NPC(sc)); 225 st->cr(); 226 st->cr(); 227 228 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); 229 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 230 st->cr(); 231 232 // Note: it may be unsafe to inspect memory near pc. For example, pc may 233 // point to garbage if entry point in an nmethod is corrupted. Leave 234 // this at the end, and hope for the best. 235 address pc = os::Linux::ucontext_get_pc(uc); 236 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); 237 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 238 } 239 240 241 void os::print_register_info(outputStream *st, const void *context) { 242 if (context == NULL) return; 243 244 const ucontext_t *uc = (const ucontext_t*)context; 245 const sigcontext* sc = (const sigcontext*)context; 246 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 247 248 st->print_cr("Register to memory mapping:"); 249 st->cr(); 250 251 // this is only for the "general purpose" registers 252 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); 253 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); 254 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); 255 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); 256 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); 257 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); 258 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); 259 st->cr(); 260 261 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); 262 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); 263 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); 264 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); 265 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); 266 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); 267 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); 268 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); 269 st->cr(); 270 271 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); 272 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); 273 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); 274 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); 275 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); 276 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); 277 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); 278 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); 279 st->cr(); 280 281 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); 282 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); 283 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); 284 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); 285 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); 286 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); 287 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); 288 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); 289 st->cr(); 290 } 291 292 293 address os::Linux::ucontext_get_pc(const ucontext_t* uc) { 294 return (address) SIG_PC((sigcontext*)uc); 295 } 296 297 void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { 298 sigcontext* ctx = (sigcontext*) uc; 299 SIG_PC(ctx) = (intptr_t)pc; 300 SIG_NPC(ctx) = (intptr_t)(pc+4); 301 } 302 303 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) { 304 return (intptr_t*) 305 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); 306 } 307 308 // not used on Sparc 309 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) { 310 ShouldNotReachHere(); 311 return NULL; 312 } 313 314 // Utility functions 315 316 inline static bool checkPrefetch(sigcontext* uc, address pc) { 317 if (StubRoutines::is_safefetch_fault(pc)) { 318 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc)); 319 return true; 320 } 321 return false; 322 } 323 324 inline static bool checkOverflow(sigcontext* uc, 325 address pc, 326 address addr, 327 JavaThread* thread, 328 address* stub) { 329 // check if fault address is within thread stack 330 if (thread->on_local_stack(addr)) { 331 // stack overflow 332 if (thread->in_stack_yellow_reserved_zone(addr)) { 333 thread->disable_stack_yellow_reserved_zone(); 334 if (thread->thread_state() == _thread_in_Java) { 335 // Throw a stack overflow exception. Guard pages will be reenabled 336 // while unwinding the stack. 337 *stub = 338 SharedRuntime::continuation_for_implicit_exception(thread, 339 pc, 340 SharedRuntime::STACK_OVERFLOW); 341 } else { 342 // Thread was in the vm or native code. Return and try to finish. 343 return true; 344 } 345 } else if (thread->in_stack_red_zone(addr)) { 346 // Fatal red zone violation. Disable the guard pages and fall through 347 // to handle_unexpected_exception way down below. 348 thread->disable_stack_red_zone(); 349 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 350 351 // This is a likely cause, but hard to verify. Let's just print 352 // it as a hint. 353 tty->print_raw_cr("Please check if any of your loaded .so files has " 354 "enabled executable stack (see man page execstack(8))"); 355 } else { 356 // Accessing stack address below sp may cause SEGV if current 357 // thread has MAP_GROWSDOWN stack. This should only happen when 358 // current thread was created by user code with MAP_GROWSDOWN flag 359 // and then attached to VM. See notes in os_linux.cpp. 360 if (thread->osthread()->expanding_stack() == 0) { 361 thread->osthread()->set_expanding_stack(); 362 if (os::Linux::manually_expand_stack(thread, addr)) { 363 thread->osthread()->clear_expanding_stack(); 364 return true; 365 } 366 thread->osthread()->clear_expanding_stack(); 367 } else { 368 fatal("recursive segv. expanding stack."); 369 } 370 } 371 } 372 return false; 373 } 374 375 inline static bool checkPollingPage(address pc, address fault, address* stub) { 376 if (fault == os::get_polling_page()) { 377 *stub = SharedRuntime::get_poll_stub(pc); 378 return true; 379 } 380 return false; 381 } 382 383 inline static bool checkByteBuffer(address pc, address npc, JavaThread * thread, address* stub) { 384 // BugId 4454115: A read from a MappedByteBuffer can fault 385 // here if the underlying file has been truncated. 386 // Do not crash the VM in such a case. 387 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 388 CompiledMethod* nm = cb->as_compiled_method_or_null(); 389 if (nm != NULL && nm->has_unsafe_access()) { 390 *stub = SharedRuntime::handle_unsafe_access(thread, npc); 391 return true; 392 } 393 return false; 394 } 395 396 inline static bool checkVerifyOops(address pc, address fault, address* stub) { 397 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] 398 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { 399 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; 400 warning("fixed up memory fault in +VerifyOops at address " 401 INTPTR_FORMAT, p2i(fault)); 402 return true; 403 } 404 return false; 405 } 406 407 inline static bool checkFPFault(address pc, int code, 408 JavaThread* thread, address* stub) { 409 if (code == FPE_INTDIV || code == FPE_FLTDIV) { 410 *stub = 411 SharedRuntime:: 412 continuation_for_implicit_exception(thread, 413 pc, 414 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 415 return true; 416 } 417 return false; 418 } 419 420 inline static bool checkNullPointer(address pc, intptr_t fault, 421 JavaThread* thread, address* stub) { 422 if (!MacroAssembler::needs_explicit_null_check(fault)) { 423 // Determination of interpreter/vtable stub/compiled code null 424 // exception 425 *stub = 426 SharedRuntime:: 427 continuation_for_implicit_exception(thread, pc, 428 SharedRuntime::IMPLICIT_NULL); 429 return true; 430 } 431 return false; 432 } 433 434 inline static bool checkFastJNIAccess(address pc, address* stub) { 435 address addr = JNI_FastGetField::find_slowcase_pc(pc); 436 if (addr != (address)-1) { 437 *stub = addr; 438 return true; 439 } 440 return false; 441 } 442 443 inline static bool checkSerializePage(JavaThread* thread, address addr) { 444 return os::is_memory_serialize_page(thread, addr); 445 } 446 447 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { 448 if (nativeInstruction_at(*pc)->is_zombie()) { 449 // zombie method (ld [%g0],%o7 instruction) 450 *stub = SharedRuntime::get_handle_wrong_method_stub(); 451 452 // At the stub it needs to look like a call from the caller of this 453 // method (not a call from the segv site). 454 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 455 return true; 456 } 457 return false; 458 } 459 460 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { 461 #ifdef COMPILER2 462 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { 463 #ifdef ASSERT 464 #ifdef TIERED 465 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); 466 assert(cb->is_compiled_by_c2(), "Wrong compiler"); 467 #endif // TIERED 468 #endif // ASSERT 469 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. 470 *stub = SharedRuntime::get_ic_miss_stub(); 471 // At the stub it needs to look like a call from the caller of this 472 // method (not a call from the segv site). 473 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 474 return true; 475 } 476 #endif // COMPILER2 477 return false; 478 } 479 480 extern "C" JNIEXPORT int 481 JVM_handle_linux_signal(int sig, 482 siginfo_t* info, 483 void* ucVoid, 484 int abort_if_unrecognized) { 485 // in fact this isn't ucontext_t* at all, but struct sigcontext* 486 // but Linux porting layer uses ucontext_t, so to minimize code change 487 // we cast as needed 488 ucontext_t* ucFake = (ucontext_t*) ucVoid; 489 sigcontext* uc = (sigcontext*)ucVoid; 490 491 Thread* t = Thread::current_or_null_safe(); 492 493 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 494 // (no destructors can be run) 495 os::ThreadCrashProtection::check_crash_protection(sig, t); 496 497 SignalHandlerMark shm(t); 498 499 // Note: it's not uncommon that JNI code uses signal/sigset to install 500 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 501 // or have a SIGILL handler when detecting CPU type). When that happens, 502 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 503 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 504 // that do not require siginfo/ucontext first. 505 506 if (sig == SIGPIPE || sig == SIGXFSZ) { 507 // allow chained handler to go first 508 if (os::Linux::chained_handler(sig, info, ucVoid)) { 509 return true; 510 } else { 511 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 512 return true; 513 } 514 } 515 516 JavaThread* thread = NULL; 517 VMThread* vmthread = NULL; 518 if (os::Linux::signal_handlers_are_installed) { 519 if (t != NULL ){ 520 if(t->is_Java_thread()) { 521 thread = (JavaThread*)t; 522 } 523 else if(t->is_VM_thread()){ 524 vmthread = (VMThread *)t; 525 } 526 } 527 } 528 529 // decide if this trap can be handled by a stub 530 address stub = NULL; 531 address pc = NULL; 532 address npc = NULL; 533 534 //%note os_trap_1 535 if (info != NULL && uc != NULL && thread != NULL) { 536 pc = address(SIG_PC(uc)); 537 npc = address(SIG_NPC(uc)); 538 539 // Check to see if we caught the safepoint code in the 540 // process of write protecting the memory serialization page. 541 // It write enables the page immediately after protecting it 542 // so we can just return to retry the write. 543 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { 544 // Block current thread until the memory serialize page permission restored. 545 os::block_on_serialize_page_trap(); 546 return 1; 547 } 548 549 if (checkPrefetch(uc, pc)) { 550 return 1; 551 } 552 553 // Handle ALL stack overflow variations here 554 if (sig == SIGSEGV) { 555 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { 556 return 1; 557 } 558 } 559 560 if (sig == SIGBUS && 561 thread->thread_state() == _thread_in_vm && 562 thread->doing_unsafe_access()) { 563 stub = SharedRuntime::handle_unsafe_access(thread, npc); 564 } 565 566 if (thread->thread_state() == _thread_in_Java) { 567 do { 568 // Java thread running in Java code => find exception handler if any 569 // a fault inside compiled code, the interpreter, or a stub 570 571 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { 572 break; 573 } 574 575 if ((sig == SIGBUS) && checkByteBuffer(pc, npc, thread, &stub)) { 576 break; 577 } 578 579 if ((sig == SIGSEGV || sig == SIGBUS) && 580 checkVerifyOops(pc, (address)info->si_addr, &stub)) { 581 break; 582 } 583 584 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { 585 break; 586 } 587 588 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { 589 break; 590 } 591 592 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { 593 break; 594 } 595 596 if ((sig == SIGSEGV) && 597 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { 598 break; 599 } 600 } while (0); 601 602 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 603 // and the heap gets shrunk before the field access. 604 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 605 checkFastJNIAccess(pc, &stub); 606 } 607 } 608 609 if (stub != NULL) { 610 // save all thread context in case we need to restore it 611 thread->set_saved_exception_pc(pc); 612 thread->set_saved_exception_npc(npc); 613 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub); 614 return true; 615 } 616 } 617 618 // signal-chaining 619 if (os::Linux::chained_handler(sig, info, ucVoid)) { 620 return true; 621 } 622 623 if (!abort_if_unrecognized) { 624 // caller wants another chance, so give it to him 625 return false; 626 } 627 628 if (pc == NULL && uc != NULL) { 629 pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc); 630 } 631 632 // unmask current signal 633 sigset_t newset; 634 sigemptyset(&newset); 635 sigaddset(&newset, sig); 636 sigprocmask(SIG_UNBLOCK, &newset, NULL); 637 638 VMError::report_and_die(t, sig, pc, info, ucVoid); 639 640 ShouldNotReachHere(); 641 return false; 642 } 643 644 void os::Linux::init_thread_fpu_state(void) { 645 // Nothing to do 646 } 647 648 int os::Linux::get_fpu_control_word() { 649 return 0; 650 } 651 652 void os::Linux::set_fpu_control_word(int fpu) { 653 // nothing 654 } 655 656 bool os::is_allocatable(size_t bytes) { 657 return true; 658 } 659 660 /////////////////////////////////////////////////////////////////////////////// 661 // thread stack 662 663 // Minimum usable stack sizes required to get to user code. Space for 664 // HotSpot guard pages is added later. 665 size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K; 666 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; 667 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K; 668 669 // return default stack size for thr_type 670 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 671 // default stack size (compiler thread needs larger stack) 672 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 673 return s; 674 } 675 676 #ifndef PRODUCT 677 void os::verify_stack_alignment() { 678 } 679 #endif 680 681 int os::extra_bang_size_in_bytes() { 682 // SPARC does not require the additional stack bang. 683 return 0; 684 }