1 /* 2 * Copyright (c) 1999, 2018, 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.inline.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/debug.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 #define SIG_PC(x) ((x)->sigc_regs.tpc) 59 #define SIG_NPC(x) ((x)->sigc_regs.tnpc) 60 #define SIG_REGS(x) ((x)->sigc_regs) 61 62 // those are to reference registers in sigcontext 63 enum { 64 CON_G0 = 0, 65 CON_G1, 66 CON_G2, 67 CON_G3, 68 CON_G4, 69 CON_G5, 70 CON_G6, 71 CON_G7, 72 CON_O0, 73 CON_O1, 74 CON_O2, 75 CON_O3, 76 CON_O4, 77 CON_O5, 78 CON_O6, 79 CON_O7, 80 }; 81 82 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 83 // currently interrupted by SIGPROF. 84 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested 85 // signal frames. Currently we don't do that on Linux, so it's the 86 // same as os::fetch_frame_from_context(). 87 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 88 const ucontext_t* uc, 89 intptr_t** ret_sp, 90 intptr_t** ret_fp) { 91 assert(thread != NULL, "just checking"); 92 assert(ret_sp != NULL, "just checking"); 93 assert(ret_fp != NULL, "just checking"); 94 95 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 96 } 97 98 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 99 intptr_t** ret_sp, 100 intptr_t** ret_fp) { 101 const ucontext_t* uc = (const ucontext_t*) ucVoid; 102 ExtendedPC epc; 103 104 if (uc != NULL) { 105 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 106 if (ret_sp) { 107 *ret_sp = os::Linux::ucontext_get_sp(uc); 108 } 109 if (ret_fp) { 110 *ret_fp = (intptr_t*)NULL; 111 } 112 } else { 113 // construct empty ExtendedPC for return value checking 114 epc = ExtendedPC(NULL); 115 if (ret_sp) { 116 *ret_sp = (intptr_t*) NULL; 117 } 118 if (ret_fp) { 119 *ret_fp = (intptr_t*) NULL; 120 } 121 } 122 123 return epc; 124 } 125 126 frame os::fetch_frame_from_context(const void* ucVoid) { 127 intptr_t* sp; 128 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); 129 return frame(sp, frame::unpatchable, epc.pc()); 130 } 131 132 frame os::get_sender_for_C_frame(frame* fr) { 133 return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); 134 } 135 136 frame os::current_frame() { 137 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 138 frame myframe(sp, frame::unpatchable, 139 CAST_FROM_FN_PTR(address, os::current_frame)); 140 if (os::is_first_C_frame(&myframe)) { 141 // stack is not walkable 142 return frame(NULL, frame::unpatchable, NULL); 143 } else { 144 return os::get_sender_for_C_frame(&myframe); 145 } 146 } 147 148 address os::current_stack_pointer() { 149 register void *sp __asm__ ("sp"); 150 return (address)sp; 151 } 152 153 char* os::non_memory_address_word() { 154 // Must never look like an address returned by reserve_memory, 155 // even in its subfields (as defined by the CPU immediate fields, 156 // if the CPU splits constants across multiple instructions). 157 // On SPARC, 0 != %hi(any real address), because there is no 158 // allocation in the first 1Kb of the virtual address space. 159 return (char*) 0; 160 } 161 162 void os::print_context(outputStream *st, const void *context) { 163 if (context == NULL) return; 164 165 const ucontext_t* uc = (const ucontext_t*)context; 166 sigcontext* sc = (sigcontext*)context; 167 st->print_cr("Registers:"); 168 169 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT 170 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, 171 SIG_REGS(sc).u_regs[CON_G1], 172 SIG_REGS(sc).u_regs[CON_G2], 173 SIG_REGS(sc).u_regs[CON_G3], 174 SIG_REGS(sc).u_regs[CON_G4]); 175 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT 176 " G7=" INTPTR_FORMAT " Y=0x%x", 177 SIG_REGS(sc).u_regs[CON_G5], 178 SIG_REGS(sc).u_regs[CON_G6], 179 SIG_REGS(sc).u_regs[CON_G7], 180 SIG_REGS(sc).y); 181 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT 182 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, 183 SIG_REGS(sc).u_regs[CON_O0], 184 SIG_REGS(sc).u_regs[CON_O1], 185 SIG_REGS(sc).u_regs[CON_O2], 186 SIG_REGS(sc).u_regs[CON_O3]); 187 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT 188 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, 189 SIG_REGS(sc).u_regs[CON_O4], 190 SIG_REGS(sc).u_regs[CON_O5], 191 SIG_REGS(sc).u_regs[CON_O6], 192 SIG_REGS(sc).u_regs[CON_O7]); 193 194 195 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 196 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT 197 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, 198 sp[L0->sp_offset_in_saved_window()], 199 sp[L1->sp_offset_in_saved_window()], 200 sp[L2->sp_offset_in_saved_window()], 201 sp[L3->sp_offset_in_saved_window()]); 202 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT 203 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, 204 sp[L4->sp_offset_in_saved_window()], 205 sp[L5->sp_offset_in_saved_window()], 206 sp[L6->sp_offset_in_saved_window()], 207 sp[L7->sp_offset_in_saved_window()]); 208 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT 209 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, 210 sp[I0->sp_offset_in_saved_window()], 211 sp[I1->sp_offset_in_saved_window()], 212 sp[I2->sp_offset_in_saved_window()], 213 sp[I3->sp_offset_in_saved_window()]); 214 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT 215 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, 216 sp[I4->sp_offset_in_saved_window()], 217 sp[I5->sp_offset_in_saved_window()], 218 sp[I6->sp_offset_in_saved_window()], 219 sp[I7->sp_offset_in_saved_window()]); 220 221 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, 222 SIG_PC(sc), 223 SIG_NPC(sc)); 224 st->cr(); 225 st->cr(); 226 227 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); 228 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 229 st->cr(); 230 231 // Note: it may be unsafe to inspect memory near pc. For example, pc may 232 // point to garbage if entry point in an nmethod is corrupted. Leave 233 // this at the end, and hope for the best. 234 address pc = os::Linux::ucontext_get_pc(uc); 235 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); 236 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 237 } 238 239 240 void os::print_register_info(outputStream *st, const void *context) { 241 if (context == NULL) return; 242 243 const ucontext_t *uc = (const ucontext_t*)context; 244 const sigcontext* sc = (const sigcontext*)context; 245 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 246 247 st->print_cr("Register to memory mapping:"); 248 st->cr(); 249 250 // this is only for the "general purpose" registers 251 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); 252 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); 253 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); 254 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); 255 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); 256 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); 257 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); 258 st->cr(); 259 260 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); 261 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); 262 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); 263 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); 264 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); 265 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); 266 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); 267 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); 268 st->cr(); 269 270 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); 271 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); 272 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); 273 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); 274 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); 275 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); 276 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); 277 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); 278 st->cr(); 279 280 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); 281 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); 282 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); 283 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); 284 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); 285 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); 286 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); 287 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); 288 st->cr(); 289 } 290 291 292 address os::Linux::ucontext_get_pc(const ucontext_t* uc) { 293 return (address) SIG_PC((sigcontext*)uc); 294 } 295 296 void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { 297 sigcontext* ctx = (sigcontext*) uc; 298 SIG_PC(ctx) = (intptr_t)pc; 299 SIG_NPC(ctx) = (intptr_t)(pc+4); 300 } 301 302 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) { 303 return (intptr_t*) 304 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); 305 } 306 307 // not used on Sparc 308 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) { 309 ShouldNotReachHere(); 310 return NULL; 311 } 312 313 // Utility functions 314 315 inline static bool checkPrefetch(sigcontext* uc, address pc) { 316 if (StubRoutines::is_safefetch_fault(pc)) { 317 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc)); 318 return true; 319 } 320 return false; 321 } 322 323 inline static bool checkOverflow(sigcontext* uc, 324 address pc, 325 address addr, 326 JavaThread* thread, 327 address* stub) { 328 // check if fault address is within thread stack 329 if (thread->on_local_stack(addr)) { 330 // stack overflow 331 if (thread->in_stack_yellow_reserved_zone(addr)) { 332 thread->disable_stack_yellow_reserved_zone(); 333 if (thread->thread_state() == _thread_in_Java) { 334 // Throw a stack overflow exception. Guard pages will be reenabled 335 // while unwinding the stack. 336 *stub = 337 SharedRuntime::continuation_for_implicit_exception(thread, 338 pc, 339 SharedRuntime::STACK_OVERFLOW); 340 } else { 341 // Thread was in the vm or native code. Return and try to finish. 342 return true; 343 } 344 } else if (thread->in_stack_red_zone(addr)) { 345 // Fatal red zone violation. Disable the guard pages and fall through 346 // to handle_unexpected_exception way down below. 347 thread->disable_stack_red_zone(); 348 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 349 350 // This is a likely cause, but hard to verify. Let's just print 351 // it as a hint. 352 tty->print_raw_cr("Please check if any of your loaded .so files has " 353 "enabled executable stack (see man page execstack(8))"); 354 } else { 355 // Accessing stack address below sp may cause SEGV if current 356 // thread has MAP_GROWSDOWN stack. This should only happen when 357 // current thread was created by user code with MAP_GROWSDOWN flag 358 // and then attached to VM. See notes in os_linux.cpp. 359 if (thread->osthread()->expanding_stack() == 0) { 360 thread->osthread()->set_expanding_stack(); 361 if (os::Linux::manually_expand_stack(thread, addr)) { 362 thread->osthread()->clear_expanding_stack(); 363 return true; 364 } 365 thread->osthread()->clear_expanding_stack(); 366 } else { 367 fatal("recursive segv. expanding stack."); 368 } 369 } 370 } 371 return false; 372 } 373 374 inline static bool checkPollingPage(address pc, address fault, address* stub) { 375 if (os::is_poll_address(fault)) { 376 *stub = SharedRuntime::get_poll_stub(pc); 377 return true; 378 } 379 return false; 380 } 381 382 inline static bool checkByteBuffer(address pc, address npc, JavaThread * thread, address* stub) { 383 // BugId 4454115: A read from a MappedByteBuffer can fault 384 // here if the underlying file has been truncated. 385 // Do not crash the VM in such a case. 386 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 387 CompiledMethod* nm = cb->as_compiled_method_or_null(); 388 if (nm != NULL && nm->has_unsafe_access()) { 389 *stub = SharedRuntime::handle_unsafe_access(thread, npc); 390 return true; 391 } 392 return false; 393 } 394 395 inline static bool checkVerifyOops(address pc, address fault, address* stub) { 396 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] 397 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { 398 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; 399 warning("fixed up memory fault in +VerifyOops at address " 400 INTPTR_FORMAT, p2i(fault)); 401 return true; 402 } 403 return false; 404 } 405 406 inline static bool checkFPFault(address pc, int code, 407 JavaThread* thread, address* stub) { 408 if (code == FPE_INTDIV || code == FPE_FLTDIV) { 409 *stub = 410 SharedRuntime:: 411 continuation_for_implicit_exception(thread, 412 pc, 413 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 414 return true; 415 } 416 return false; 417 } 418 419 inline static bool checkNullPointer(address pc, void* fault, 420 JavaThread* thread, address* stub) { 421 if (MacroAssembler::uses_implicit_null_check(fault)) { 422 // Determination of interpreter/vtable stub/compiled code null 423 // exception 424 *stub = 425 SharedRuntime:: 426 continuation_for_implicit_exception(thread, pc, 427 SharedRuntime::IMPLICIT_NULL); 428 return true; 429 } 430 return false; 431 } 432 433 inline static bool checkFastJNIAccess(address pc, address* stub) { 434 address addr = JNI_FastGetField::find_slowcase_pc(pc); 435 if (addr != (address)-1) { 436 *stub = addr; 437 return true; 438 } 439 return false; 440 } 441 442 inline static bool checkSerializePage(JavaThread* thread, address addr) { 443 return os::is_memory_serialize_page(thread, addr); 444 } 445 446 inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { 447 if (nativeInstruction_at(*pc)->is_zombie()) { 448 // zombie method (ld [%g0],%o7 instruction) 449 *stub = SharedRuntime::get_handle_wrong_method_stub(); 450 451 // At the stub it needs to look like a call from the caller of this 452 // method (not a call from the segv site). 453 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 454 return true; 455 } 456 return false; 457 } 458 459 inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { 460 #ifdef COMPILER2 461 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { 462 #ifdef ASSERT 463 #ifdef TIERED 464 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); 465 assert(cb->is_compiled_by_c2(), "Wrong compiler"); 466 #endif // TIERED 467 #endif // ASSERT 468 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. 469 *stub = SharedRuntime::get_ic_miss_stub(); 470 // At the stub it needs to look like a call from the caller of this 471 // method (not a call from the segv site). 472 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 473 return true; 474 } 475 #endif // COMPILER2 476 return false; 477 } 478 479 extern "C" JNIEXPORT int 480 JVM_handle_linux_signal(int sig, 481 siginfo_t* info, 482 void* ucVoid, 483 int abort_if_unrecognized) { 484 // in fact this isn't ucontext_t* at all, but struct sigcontext* 485 // but Linux porting layer uses ucontext_t, so to minimize code change 486 // we cast as needed 487 ucontext_t* ucFake = (ucontext_t*) ucVoid; 488 sigcontext* uc = (sigcontext*)ucVoid; 489 490 Thread* t = Thread::current_or_null_safe(); 491 492 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 493 // (no destructors can be run) 494 os::ThreadCrashProtection::check_crash_protection(sig, t); 495 496 SignalHandlerMark shm(t); 497 498 // Note: it's not uncommon that JNI code uses signal/sigset to install 499 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 500 // or have a SIGILL handler when detecting CPU type). When that happens, 501 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 502 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 503 // that do not require siginfo/ucontext first. 504 505 if (sig == SIGPIPE || sig == SIGXFSZ) { 506 // allow chained handler to go first 507 if (os::Linux::chained_handler(sig, info, ucVoid)) { 508 return true; 509 } else { 510 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 511 return true; 512 } 513 } 514 515 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT 516 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { 517 handle_assert_poison_fault(ucVoid, info->si_addr); 518 return 1; 519 } 520 #endif 521 522 JavaThread* thread = NULL; 523 VMThread* vmthread = NULL; 524 if (os::Linux::signal_handlers_are_installed) { 525 if (t != NULL ){ 526 if(t->is_Java_thread()) { 527 thread = (JavaThread*)t; 528 } 529 else if(t->is_VM_thread()){ 530 vmthread = (VMThread *)t; 531 } 532 } 533 } 534 535 // decide if this trap can be handled by a stub 536 address stub = NULL; 537 address pc = NULL; 538 address npc = NULL; 539 540 //%note os_trap_1 541 if (info != NULL && uc != NULL && thread != NULL) { 542 pc = address(SIG_PC(uc)); 543 npc = address(SIG_NPC(uc)); 544 545 // Check to see if we caught the safepoint code in the 546 // process of write protecting the memory serialization page. 547 // It write enables the page immediately after protecting it 548 // so we can just return to retry the write. 549 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { 550 // Block current thread until the memory serialize page permission restored. 551 os::block_on_serialize_page_trap(); 552 return 1; 553 } 554 555 if (checkPrefetch(uc, pc)) { 556 return 1; 557 } 558 559 // Handle ALL stack overflow variations here 560 if (sig == SIGSEGV) { 561 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { 562 return 1; 563 } 564 } 565 566 if (sig == SIGBUS && 567 thread->thread_state() == _thread_in_vm && 568 thread->doing_unsafe_access()) { 569 stub = SharedRuntime::handle_unsafe_access(thread, npc); 570 } 571 572 if (thread->thread_state() == _thread_in_Java) { 573 do { 574 // Java thread running in Java code => find exception handler if any 575 // a fault inside compiled code, the interpreter, or a stub 576 577 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { 578 break; 579 } 580 581 if ((sig == SIGBUS) && checkByteBuffer(pc, npc, thread, &stub)) { 582 break; 583 } 584 585 if ((sig == SIGSEGV || sig == SIGBUS) && 586 checkVerifyOops(pc, (address)info->si_addr, &stub)) { 587 break; 588 } 589 590 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { 591 break; 592 } 593 594 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { 595 break; 596 } 597 598 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { 599 break; 600 } 601 602 if ((sig == SIGSEGV) && 603 checkNullPointer(pc, info->si_addr, thread, &stub)) { 604 break; 605 } 606 } while (0); 607 608 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 609 // and the heap gets shrunk before the field access. 610 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 611 checkFastJNIAccess(pc, &stub); 612 } 613 } 614 615 if (stub != NULL) { 616 // save all thread context in case we need to restore it 617 thread->set_saved_exception_pc(pc); 618 thread->set_saved_exception_npc(npc); 619 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub); 620 return true; 621 } 622 } 623 624 // signal-chaining 625 if (os::Linux::chained_handler(sig, info, ucVoid)) { 626 return true; 627 } 628 629 if (!abort_if_unrecognized) { 630 // caller wants another chance, so give it to him 631 return false; 632 } 633 634 if (pc == NULL && uc != NULL) { 635 pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc); 636 } 637 638 // unmask current signal 639 sigset_t newset; 640 sigemptyset(&newset); 641 sigaddset(&newset, sig); 642 sigprocmask(SIG_UNBLOCK, &newset, NULL); 643 644 VMError::report_and_die(t, sig, pc, info, ucVoid); 645 646 ShouldNotReachHere(); 647 return false; 648 } 649 650 void os::Linux::init_thread_fpu_state(void) { 651 // Nothing to do 652 } 653 654 int os::Linux::get_fpu_control_word() { 655 return 0; 656 } 657 658 void os::Linux::set_fpu_control_word(int fpu) { 659 // nothing 660 } 661 662 bool os::is_allocatable(size_t bytes) { 663 return true; 664 } 665 666 /////////////////////////////////////////////////////////////////////////////// 667 // thread stack 668 669 // Minimum usable stack sizes required to get to user code. Space for 670 // HotSpot guard pages is added later. 671 size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K; 672 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; 673 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K; 674 675 // return default stack size for thr_type 676 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 677 // default stack size (compiler thread needs larger stack) 678 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 679 return s; 680 } 681 682 #ifndef PRODUCT 683 void os::verify_stack_alignment() { 684 } 685 #endif 686 687 int os::extra_bang_size_in_bytes() { 688 // SPARC does not require the additional stack bang. 689 return 0; 690 }