os_linux_sparc.cpp revision 11079:69d081845165
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 "mutex_linux.inline.hpp" 37#include "nativeInst_sparc.hpp" 38#include "os_share_linux.hpp" 39#include "prims/jniFastGetField.hpp" 40#include "prims/jvm.h" 41#include "prims/jvm_misc.hpp" 42#include "runtime/arguments.hpp" 43#include "runtime/extendedPC.hpp" 44#include "runtime/frame.inline.hpp" 45#include "runtime/interfaceSupport.hpp" 46#include "runtime/java.hpp" 47#include "runtime/javaCalls.hpp" 48#include "runtime/mutexLocker.hpp" 49#include "runtime/osThread.hpp" 50#include "runtime/sharedRuntime.hpp" 51#include "runtime/stubRoutines.hpp" 52#include "runtime/thread.inline.hpp" 53#include "runtime/timer.hpp" 54#include "utilities/events.hpp" 55#include "utilities/vmError.hpp" 56 57// Linux/Sparc has rather obscure naming of registers in sigcontext 58// different between 32 and 64 bits 59#ifdef _LP64 60#define SIG_PC(x) ((x)->sigc_regs.tpc) 61#define SIG_NPC(x) ((x)->sigc_regs.tnpc) 62#define SIG_REGS(x) ((x)->sigc_regs) 63#else 64#define SIG_PC(x) ((x)->si_regs.pc) 65#define SIG_NPC(x) ((x)->si_regs.npc) 66#define SIG_REGS(x) ((x)->si_regs) 67#endif 68 69// those are to reference registers in sigcontext 70enum { 71 CON_G0 = 0, 72 CON_G1, 73 CON_G2, 74 CON_G3, 75 CON_G4, 76 CON_G5, 77 CON_G6, 78 CON_G7, 79 CON_O0, 80 CON_O1, 81 CON_O2, 82 CON_O3, 83 CON_O4, 84 CON_O5, 85 CON_O6, 86 CON_O7, 87}; 88 89// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 90// currently interrupted by SIGPROF. 91// os::Solaris::fetch_frame_from_ucontext() tries to skip nested 92// signal frames. Currently we don't do that on Linux, so it's the 93// same as os::fetch_frame_from_context(). 94ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 95 const ucontext_t* uc, 96 intptr_t** ret_sp, 97 intptr_t** ret_fp) { 98 assert(thread != NULL, "just checking"); 99 assert(ret_sp != NULL, "just checking"); 100 assert(ret_fp != NULL, "just checking"); 101 102 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 103} 104 105ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 106 intptr_t** ret_sp, 107 intptr_t** ret_fp) { 108 const ucontext_t* uc = (const ucontext_t*) ucVoid; 109 ExtendedPC epc; 110 111 if (uc != NULL) { 112 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 113 if (ret_sp) { 114 *ret_sp = os::Linux::ucontext_get_sp(uc); 115 } 116 if (ret_fp) { 117 *ret_fp = (intptr_t*)NULL; 118 } 119 } else { 120 // construct empty ExtendedPC for return value checking 121 epc = ExtendedPC(NULL); 122 if (ret_sp) { 123 *ret_sp = (intptr_t*) NULL; 124 } 125 if (ret_fp) { 126 *ret_fp = (intptr_t*) NULL; 127 } 128 } 129 130 return epc; 131} 132 133frame os::fetch_frame_from_context(const void* ucVoid) { 134 intptr_t* sp; 135 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, NULL); 136 return frame(sp, frame::unpatchable, epc.pc()); 137} 138 139frame os::get_sender_for_C_frame(frame* fr) { 140 return frame(fr->sender_sp(), frame::unpatchable, fr->sender_pc()); 141} 142 143frame os::current_frame() { 144 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 145 frame myframe(sp, frame::unpatchable, 146 CAST_FROM_FN_PTR(address, os::current_frame)); 147 if (os::is_first_C_frame(&myframe)) { 148 // stack is not walkable 149 return frame(NULL, frame::unpatchable, NULL); 150 } else { 151 return os::get_sender_for_C_frame(&myframe); 152 } 153} 154 155address os::current_stack_pointer() { 156 register void *sp __asm__ ("sp"); 157 return (address)sp; 158} 159 160static void current_stack_region(address* bottom, size_t* size) { 161 if (os::Linux::is_initial_thread()) { 162 // initial thread needs special handling because pthread_getattr_np() 163 // may return bogus value. 164 *bottom = os::Linux::initial_thread_stack_bottom(); 165 *size = os::Linux::initial_thread_stack_size(); 166 } else { 167 pthread_attr_t attr; 168 169 int rslt = pthread_getattr_np(pthread_self(), &attr); 170 171 // JVM needs to know exact stack location, abort if it fails 172 if (rslt != 0) { 173 if (rslt == ENOMEM) { 174 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); 175 } else { 176 fatal("pthread_getattr_np failed with errno = %d", rslt); 177 } 178 } 179 180 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { 181 fatal("Can not locate current stack attributes!"); 182 } 183 184 pthread_attr_destroy(&attr); 185 } 186 assert(os::current_stack_pointer() >= *bottom && 187 os::current_stack_pointer() < *bottom + *size, "just checking"); 188} 189 190address os::current_stack_base() { 191 address bottom; 192 size_t size; 193 current_stack_region(&bottom, &size); 194 return bottom + size; 195} 196 197size_t os::current_stack_size() { 198 // stack size includes normal stack and HotSpot guard pages 199 address bottom; 200 size_t size; 201 current_stack_region(&bottom, &size); 202 return size; 203} 204 205char* os::non_memory_address_word() { 206 // Must never look like an address returned by reserve_memory, 207 // even in its subfields (as defined by the CPU immediate fields, 208 // if the CPU splits constants across multiple instructions). 209 // On SPARC, 0 != %hi(any real address), because there is no 210 // allocation in the first 1Kb of the virtual address space. 211 return (char*) 0; 212} 213 214void os::initialize_thread(Thread* thr) {} 215 216void os::print_context(outputStream *st, const void *context) { 217 if (context == NULL) return; 218 219 const ucontext_t* uc = (const ucontext_t*)context; 220 sigcontext* sc = (sigcontext*)context; 221 st->print_cr("Registers:"); 222 223 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT 224 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, 225 SIG_REGS(sc).u_regs[CON_G1], 226 SIG_REGS(sc).u_regs[CON_G2], 227 SIG_REGS(sc).u_regs[CON_G3], 228 SIG_REGS(sc).u_regs[CON_G4]); 229 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT 230 " G7=" INTPTR_FORMAT " Y=0x%x", 231 SIG_REGS(sc).u_regs[CON_G5], 232 SIG_REGS(sc).u_regs[CON_G6], 233 SIG_REGS(sc).u_regs[CON_G7], 234 SIG_REGS(sc).y); 235 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT 236 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, 237 SIG_REGS(sc).u_regs[CON_O0], 238 SIG_REGS(sc).u_regs[CON_O1], 239 SIG_REGS(sc).u_regs[CON_O2], 240 SIG_REGS(sc).u_regs[CON_O3]); 241 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT 242 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, 243 SIG_REGS(sc).u_regs[CON_O4], 244 SIG_REGS(sc).u_regs[CON_O5], 245 SIG_REGS(sc).u_regs[CON_O6], 246 SIG_REGS(sc).u_regs[CON_O7]); 247 248 249 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 250 st->print_cr(" L0=" INTPTR_FORMAT " L1=" INTPTR_FORMAT 251 " L2=" INTPTR_FORMAT " L3=" INTPTR_FORMAT, 252 sp[L0->sp_offset_in_saved_window()], 253 sp[L1->sp_offset_in_saved_window()], 254 sp[L2->sp_offset_in_saved_window()], 255 sp[L3->sp_offset_in_saved_window()]); 256 st->print_cr(" L4=" INTPTR_FORMAT " L5=" INTPTR_FORMAT 257 " L6=" INTPTR_FORMAT " L7=" INTPTR_FORMAT, 258 sp[L4->sp_offset_in_saved_window()], 259 sp[L5->sp_offset_in_saved_window()], 260 sp[L6->sp_offset_in_saved_window()], 261 sp[L7->sp_offset_in_saved_window()]); 262 st->print_cr(" I0=" INTPTR_FORMAT " I1=" INTPTR_FORMAT 263 " I2=" INTPTR_FORMAT " I3=" INTPTR_FORMAT, 264 sp[I0->sp_offset_in_saved_window()], 265 sp[I1->sp_offset_in_saved_window()], 266 sp[I2->sp_offset_in_saved_window()], 267 sp[I3->sp_offset_in_saved_window()]); 268 st->print_cr(" I4=" INTPTR_FORMAT " I5=" INTPTR_FORMAT 269 " I6=" INTPTR_FORMAT " I7=" INTPTR_FORMAT, 270 sp[I4->sp_offset_in_saved_window()], 271 sp[I5->sp_offset_in_saved_window()], 272 sp[I6->sp_offset_in_saved_window()], 273 sp[I7->sp_offset_in_saved_window()]); 274 275 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, 276 SIG_PC(sc), 277 SIG_NPC(sc)); 278 st->cr(); 279 st->cr(); 280 281 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); 282 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 283 st->cr(); 284 285 // Note: it may be unsafe to inspect memory near pc. For example, pc may 286 // point to garbage if entry point in an nmethod is corrupted. Leave 287 // this at the end, and hope for the best. 288 address pc = os::Linux::ucontext_get_pc(uc); 289 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); 290 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 291} 292 293 294void os::print_register_info(outputStream *st, const void *context) { 295 if (context == NULL) return; 296 297 const ucontext_t *uc = (const ucontext_t*)context; 298 const sigcontext* sc = (const sigcontext*)context; 299 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 300 301 st->print_cr("Register to memory mapping:"); 302 st->cr(); 303 304 // this is only for the "general purpose" registers 305 st->print("G1="); print_location(st, SIG_REGS(sc).u_regs[CON_G1]); 306 st->print("G2="); print_location(st, SIG_REGS(sc).u_regs[CON_G2]); 307 st->print("G3="); print_location(st, SIG_REGS(sc).u_regs[CON_G3]); 308 st->print("G4="); print_location(st, SIG_REGS(sc).u_regs[CON_G4]); 309 st->print("G5="); print_location(st, SIG_REGS(sc).u_regs[CON_G5]); 310 st->print("G6="); print_location(st, SIG_REGS(sc).u_regs[CON_G6]); 311 st->print("G7="); print_location(st, SIG_REGS(sc).u_regs[CON_G7]); 312 st->cr(); 313 314 st->print("O0="); print_location(st, SIG_REGS(sc).u_regs[CON_O0]); 315 st->print("O1="); print_location(st, SIG_REGS(sc).u_regs[CON_O1]); 316 st->print("O2="); print_location(st, SIG_REGS(sc).u_regs[CON_O2]); 317 st->print("O3="); print_location(st, SIG_REGS(sc).u_regs[CON_O3]); 318 st->print("O4="); print_location(st, SIG_REGS(sc).u_regs[CON_O4]); 319 st->print("O5="); print_location(st, SIG_REGS(sc).u_regs[CON_O5]); 320 st->print("O6="); print_location(st, SIG_REGS(sc).u_regs[CON_O6]); 321 st->print("O7="); print_location(st, SIG_REGS(sc).u_regs[CON_O7]); 322 st->cr(); 323 324 st->print("L0="); print_location(st, sp[L0->sp_offset_in_saved_window()]); 325 st->print("L1="); print_location(st, sp[L1->sp_offset_in_saved_window()]); 326 st->print("L2="); print_location(st, sp[L2->sp_offset_in_saved_window()]); 327 st->print("L3="); print_location(st, sp[L3->sp_offset_in_saved_window()]); 328 st->print("L4="); print_location(st, sp[L4->sp_offset_in_saved_window()]); 329 st->print("L5="); print_location(st, sp[L5->sp_offset_in_saved_window()]); 330 st->print("L6="); print_location(st, sp[L6->sp_offset_in_saved_window()]); 331 st->print("L7="); print_location(st, sp[L7->sp_offset_in_saved_window()]); 332 st->cr(); 333 334 st->print("I0="); print_location(st, sp[I0->sp_offset_in_saved_window()]); 335 st->print("I1="); print_location(st, sp[I1->sp_offset_in_saved_window()]); 336 st->print("I2="); print_location(st, sp[I2->sp_offset_in_saved_window()]); 337 st->print("I3="); print_location(st, sp[I3->sp_offset_in_saved_window()]); 338 st->print("I4="); print_location(st, sp[I4->sp_offset_in_saved_window()]); 339 st->print("I5="); print_location(st, sp[I5->sp_offset_in_saved_window()]); 340 st->print("I6="); print_location(st, sp[I6->sp_offset_in_saved_window()]); 341 st->print("I7="); print_location(st, sp[I7->sp_offset_in_saved_window()]); 342 st->cr(); 343} 344 345 346address os::Linux::ucontext_get_pc(const ucontext_t* uc) { 347 return (address) SIG_PC((sigcontext*)uc); 348} 349 350void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { 351 sigcontext* ctx = (sigcontext*) uc; 352 SIG_PC(ctx) = (intptr_t)pc; 353 SIG_NPC(ctx) = (intptr_t)(pc+4); 354} 355 356intptr_t* os::Linux::ucontext_get_sp(const ucontext_t *uc) { 357 return (intptr_t*) 358 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); 359} 360 361// not used on Sparc 362intptr_t* os::Linux::ucontext_get_fp(const ucontext_t *uc) { 363 ShouldNotReachHere(); 364 return NULL; 365} 366 367// Utility functions 368 369inline static bool checkPrefetch(sigcontext* uc, address pc) { 370 if (StubRoutines::is_safefetch_fault(pc)) { 371 os::Linux::ucontext_set_pc((ucontext_t*)uc, StubRoutines::continuation_for_safefetch_fault(pc)); 372 return true; 373 } 374 return false; 375} 376 377inline static bool checkOverflow(sigcontext* uc, 378 address pc, 379 address addr, 380 JavaThread* thread, 381 address* stub) { 382 // check if fault address is within thread stack 383 if (thread->on_local_stack(addr)) { 384 // stack overflow 385 if (thread->in_stack_yellow_reserved_zone(addr)) { 386 thread->disable_stack_yellow_reserved_zone(); 387 if (thread->thread_state() == _thread_in_Java) { 388 // Throw a stack overflow exception. Guard pages will be reenabled 389 // while unwinding the stack. 390 *stub = 391 SharedRuntime::continuation_for_implicit_exception(thread, 392 pc, 393 SharedRuntime::STACK_OVERFLOW); 394 } else { 395 // Thread was in the vm or native code. Return and try to finish. 396 return true; 397 } 398 } else if (thread->in_stack_red_zone(addr)) { 399 // Fatal red zone violation. Disable the guard pages and fall through 400 // to handle_unexpected_exception way down below. 401 thread->disable_stack_red_zone(); 402 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 403 404 // This is a likely cause, but hard to verify. Let's just print 405 // it as a hint. 406 tty->print_raw_cr("Please check if any of your loaded .so files has " 407 "enabled executable stack (see man page execstack(8))"); 408 } else { 409 // Accessing stack address below sp may cause SEGV if current 410 // thread has MAP_GROWSDOWN stack. This should only happen when 411 // current thread was created by user code with MAP_GROWSDOWN flag 412 // and then attached to VM. See notes in os_linux.cpp. 413 if (thread->osthread()->expanding_stack() == 0) { 414 thread->osthread()->set_expanding_stack(); 415 if (os::Linux::manually_expand_stack(thread, addr)) { 416 thread->osthread()->clear_expanding_stack(); 417 return true; 418 } 419 thread->osthread()->clear_expanding_stack(); 420 } else { 421 fatal("recursive segv. expanding stack."); 422 } 423 } 424 } 425 return false; 426} 427 428inline static bool checkPollingPage(address pc, address fault, address* stub) { 429 if (fault == os::get_polling_page()) { 430 *stub = SharedRuntime::get_poll_stub(pc); 431 return true; 432 } 433 return false; 434} 435 436inline static bool checkByteBuffer(address pc, address* stub) { 437 // BugId 4454115: A read from a MappedByteBuffer can fault 438 // here if the underlying file has been truncated. 439 // Do not crash the VM in such a case. 440 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 441 CompiledMethod* nm = cb->as_compiled_method_or_null(); 442 if (nm != NULL && nm->has_unsafe_access()) { 443 *stub = StubRoutines::handler_for_unsafe_access(); 444 return true; 445 } 446 return false; 447} 448 449inline static bool checkVerifyOops(address pc, address fault, address* stub) { 450 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] 451 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { 452 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; 453 warning("fixed up memory fault in +VerifyOops at address " 454 INTPTR_FORMAT, p2i(fault)); 455 return true; 456 } 457 return false; 458} 459 460inline static bool checkFPFault(address pc, int code, 461 JavaThread* thread, address* stub) { 462 if (code == FPE_INTDIV || code == FPE_FLTDIV) { 463 *stub = 464 SharedRuntime:: 465 continuation_for_implicit_exception(thread, 466 pc, 467 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 468 return true; 469 } 470 return false; 471} 472 473inline static bool checkNullPointer(address pc, intptr_t fault, 474 JavaThread* thread, address* stub) { 475 if (!MacroAssembler::needs_explicit_null_check(fault)) { 476 // Determination of interpreter/vtable stub/compiled code null 477 // exception 478 *stub = 479 SharedRuntime:: 480 continuation_for_implicit_exception(thread, pc, 481 SharedRuntime::IMPLICIT_NULL); 482 return true; 483 } 484 return false; 485} 486 487inline static bool checkFastJNIAccess(address pc, address* stub) { 488 address addr = JNI_FastGetField::find_slowcase_pc(pc); 489 if (addr != (address)-1) { 490 *stub = addr; 491 return true; 492 } 493 return false; 494} 495 496inline static bool checkSerializePage(JavaThread* thread, address addr) { 497 return os::is_memory_serialize_page(thread, addr); 498} 499 500inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { 501 if (nativeInstruction_at(*pc)->is_zombie()) { 502 // zombie method (ld [%g0],%o7 instruction) 503 *stub = SharedRuntime::get_handle_wrong_method_stub(); 504 505 // At the stub it needs to look like a call from the caller of this 506 // method (not a call from the segv site). 507 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 508 return true; 509 } 510 return false; 511} 512 513inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { 514#ifdef COMPILER2 515 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { 516#ifdef ASSERT 517#ifdef TIERED 518 CodeBlob* cb = CodeCache::find_blob_unsafe(*pc); 519 assert(cb->is_compiled_by_c2(), "Wrong compiler"); 520#endif // TIERED 521#endif // ASSERT 522 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. 523 *stub = SharedRuntime::get_ic_miss_stub(); 524 // At the stub it needs to look like a call from the caller of this 525 // method (not a call from the segv site). 526 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 527 return true; 528 } 529#endif // COMPILER2 530 return false; 531} 532 533extern "C" JNIEXPORT int 534JVM_handle_linux_signal(int sig, 535 siginfo_t* info, 536 void* ucVoid, 537 int abort_if_unrecognized) { 538 // in fact this isn't ucontext_t* at all, but struct sigcontext* 539 // but Linux porting layer uses ucontext_t, so to minimize code change 540 // we cast as needed 541 ucontext_t* ucFake = (ucontext_t*) ucVoid; 542 sigcontext* uc = (sigcontext*)ucVoid; 543 544 Thread* t = Thread::current_or_null_safe(); 545 546 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 547 // (no destructors can be run) 548 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 549 550 SignalHandlerMark shm(t); 551 552 // Note: it's not uncommon that JNI code uses signal/sigset to install 553 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 554 // or have a SIGILL handler when detecting CPU type). When that happens, 555 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 556 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 557 // that do not require siginfo/ucontext first. 558 559 if (sig == SIGPIPE || sig == SIGXFSZ) { 560 // allow chained handler to go first 561 if (os::Linux::chained_handler(sig, info, ucVoid)) { 562 return true; 563 } else { 564 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 565 return true; 566 } 567 } 568 569 JavaThread* thread = NULL; 570 VMThread* vmthread = NULL; 571 if (os::Linux::signal_handlers_are_installed) { 572 if (t != NULL ){ 573 if(t->is_Java_thread()) { 574 thread = (JavaThread*)t; 575 } 576 else if(t->is_VM_thread()){ 577 vmthread = (VMThread *)t; 578 } 579 } 580 } 581 582 // decide if this trap can be handled by a stub 583 address stub = NULL; 584 address pc = NULL; 585 address npc = NULL; 586 587 //%note os_trap_1 588 if (info != NULL && uc != NULL && thread != NULL) { 589 pc = address(SIG_PC(uc)); 590 npc = address(SIG_NPC(uc)); 591 592 // Check to see if we caught the safepoint code in the 593 // process of write protecting the memory serialization page. 594 // It write enables the page immediately after protecting it 595 // so we can just return to retry the write. 596 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { 597 // Block current thread until the memory serialize page permission restored. 598 os::block_on_serialize_page_trap(); 599 return 1; 600 } 601 602 if (checkPrefetch(uc, pc)) { 603 return 1; 604 } 605 606 // Handle ALL stack overflow variations here 607 if (sig == SIGSEGV) { 608 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { 609 return 1; 610 } 611 } 612 613 if (sig == SIGBUS && 614 thread->thread_state() == _thread_in_vm && 615 thread->doing_unsafe_access()) { 616 stub = StubRoutines::handler_for_unsafe_access(); 617 } 618 619 if (thread->thread_state() == _thread_in_Java) { 620 do { 621 // Java thread running in Java code => find exception handler if any 622 // a fault inside compiled code, the interpreter, or a stub 623 624 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { 625 break; 626 } 627 628 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { 629 break; 630 } 631 632 if ((sig == SIGSEGV || sig == SIGBUS) && 633 checkVerifyOops(pc, (address)info->si_addr, &stub)) { 634 break; 635 } 636 637 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { 638 break; 639 } 640 641 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { 642 break; 643 } 644 645 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { 646 break; 647 } 648 649 if ((sig == SIGSEGV) && 650 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { 651 break; 652 } 653 } while (0); 654 655 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 656 // and the heap gets shrunk before the field access. 657 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 658 checkFastJNIAccess(pc, &stub); 659 } 660 } 661 662 if (stub != NULL) { 663 // save all thread context in case we need to restore it 664 thread->set_saved_exception_pc(pc); 665 thread->set_saved_exception_npc(npc); 666 os::Linux::ucontext_set_pc((ucontext_t*)uc, stub); 667 return true; 668 } 669 } 670 671 // signal-chaining 672 if (os::Linux::chained_handler(sig, info, ucVoid)) { 673 return true; 674 } 675 676 if (!abort_if_unrecognized) { 677 // caller wants another chance, so give it to him 678 return false; 679 } 680 681 if (pc == NULL && uc != NULL) { 682 pc = os::Linux::ucontext_get_pc((const ucontext_t*)uc); 683 } 684 685 // unmask current signal 686 sigset_t newset; 687 sigemptyset(&newset); 688 sigaddset(&newset, sig); 689 sigprocmask(SIG_UNBLOCK, &newset, NULL); 690 691 VMError::report_and_die(t, sig, pc, info, ucVoid); 692 693 ShouldNotReachHere(); 694 return false; 695} 696 697void os::Linux::init_thread_fpu_state(void) { 698 // Nothing to do 699} 700 701int os::Linux::get_fpu_control_word() { 702 return 0; 703} 704 705void os::Linux::set_fpu_control_word(int fpu) { 706 // nothing 707} 708 709bool os::is_allocatable(size_t bytes) { 710#ifdef _LP64 711 return true; 712#else 713 if (bytes < 2 * G) { 714 return true; 715 } 716 717 char* addr = reserve_memory(bytes, NULL); 718 719 if (addr != NULL) { 720 release_memory(addr, bytes); 721 } 722 723 return addr != NULL; 724#endif // _LP64 725} 726 727/////////////////////////////////////////////////////////////////////////////// 728// thread stack 729 730size_t os::Linux::min_stack_allowed = 128 * K; 731 732// return default stack size for thr_type 733size_t os::Linux::default_stack_size(os::ThreadType thr_type) { 734 // default stack size (compiler thread needs larger stack) 735 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 736 return s; 737} 738 739size_t os::Linux::default_guard_size(os::ThreadType thr_type) { 740 // Creating guard page is very expensive. Java thread has HotSpot 741 // guard page, only enable glibc guard page for non-Java threads. 742 return (thr_type == java_thread ? 0 : page_size()); 743} 744 745#ifndef PRODUCT 746void os::verify_stack_alignment() { 747} 748#endif 749 750int os::extra_bang_size_in_bytes() { 751 // SPARC does not require the additional stack bang. 752 return 0; 753} 754