os_linux_sparc.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1999, 2008, 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// do not include precompiled header file 26 27#include "incls/_os_linux_sparc.cpp.incl" 28 29// Linux/Sparc has rather obscure naming of registers in sigcontext 30// different between 32 and 64 bits 31#ifdef _LP64 32#define SIG_PC(x) ((x)->sigc_regs.tpc) 33#define SIG_NPC(x) ((x)->sigc_regs.tnpc) 34#define SIG_REGS(x) ((x)->sigc_regs) 35#else 36#define SIG_PC(x) ((x)->si_regs.pc) 37#define SIG_NPC(x) ((x)->si_regs.npc) 38#define SIG_REGS(x) ((x)->si_regs) 39#endif 40 41// those are to reference registers in sigcontext 42enum { 43 CON_G0 = 0, 44 CON_G1, 45 CON_G2, 46 CON_G3, 47 CON_G4, 48 CON_G5, 49 CON_G6, 50 CON_G7, 51 CON_O0, 52 CON_O1, 53 CON_O2, 54 CON_O3, 55 CON_O4, 56 CON_O5, 57 CON_O6, 58 CON_O7, 59}; 60 61static inline void set_cont_address(sigcontext* ctx, address addr) { 62 SIG_PC(ctx) = (intptr_t)addr; 63 SIG_NPC(ctx) = (intptr_t)(addr+4); 64} 65 66// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 67// currently interrupted by SIGPROF. 68// os::Solaris::fetch_frame_from_ucontext() tries to skip nested 69// signal frames. Currently we don't do that on Linux, so it's the 70// same as os::fetch_frame_from_context(). 71ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 72 ucontext_t* uc, 73 intptr_t** ret_sp, 74 intptr_t** ret_fp) { 75 assert(thread != NULL, "just checking"); 76 assert(ret_sp != NULL, "just checking"); 77 assert(ret_fp != NULL, "just checking"); 78 79 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 80} 81 82ExtendedPC os::fetch_frame_from_context(void* ucVoid, 83 intptr_t** ret_sp, 84 intptr_t** ret_fp) { 85 ucontext_t* uc = (ucontext_t*) ucVoid; 86 ExtendedPC epc; 87 88 if (uc != NULL) { 89 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 90 if (ret_sp) { 91 *ret_sp = os::Linux::ucontext_get_sp(uc); 92 } 93 if (ret_fp) { 94 *ret_fp = os::Linux::ucontext_get_fp(uc); 95 } 96 } else { 97 // construct empty ExtendedPC for return value checking 98 epc = ExtendedPC(NULL); 99 if (ret_sp) { 100 *ret_sp = (intptr_t*) NULL; 101 } 102 if (ret_fp) { 103 *ret_fp = (intptr_t*) NULL; 104 } 105 } 106 107 return epc; 108} 109 110frame os::fetch_frame_from_context(void* ucVoid) { 111 intptr_t* sp; 112 intptr_t* fp; 113 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 114 return frame(sp, fp, epc.pc()); 115} 116 117frame os::get_sender_for_C_frame(frame* fr) { 118 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 119} 120 121frame os::current_frame() { 122 fprintf(stderr, "current_frame()"); 123 124 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 125 frame myframe(sp, frame::unpatchable, 126 CAST_FROM_FN_PTR(address, os::current_frame)); 127 if (os::is_first_C_frame(&myframe)) { 128 // stack is not walkable 129 return frame(NULL, frame::unpatchable, NULL); 130 } else { 131 return os::get_sender_for_C_frame(&myframe); 132 } 133} 134 135address os::current_stack_pointer() { 136 register void *sp __asm__ ("sp"); 137 return (address)sp; 138} 139 140static void current_stack_region(address* bottom, size_t* size) { 141 if (os::Linux::is_initial_thread()) { 142 // initial thread needs special handling because pthread_getattr_np() 143 // may return bogus value. 144 *bottom = os::Linux::initial_thread_stack_bottom(); 145 *size = os::Linux::initial_thread_stack_size(); 146 } else { 147 pthread_attr_t attr; 148 149 int rslt = pthread_getattr_np(pthread_self(), &attr); 150 151 // JVM needs to know exact stack location, abort if it fails 152 if (rslt != 0) { 153 if (rslt == ENOMEM) { 154 vm_exit_out_of_memory(0, "pthread_getattr_np"); 155 } else { 156 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); 157 } 158 } 159 160 if (pthread_attr_getstack(&attr, (void**)bottom, size) != 0) { 161 fatal("Can not locate current stack attributes!"); 162 } 163 164 pthread_attr_destroy(&attr); 165 } 166 assert(os::current_stack_pointer() >= *bottom && 167 os::current_stack_pointer() < *bottom + *size, "just checking"); 168} 169 170address os::current_stack_base() { 171 address bottom; 172 size_t size; 173 current_stack_region(&bottom, &size); 174 return bottom + size; 175} 176 177size_t os::current_stack_size() { 178 // stack size includes normal stack and HotSpot guard pages 179 address bottom; 180 size_t size; 181 current_stack_region(&bottom, &size); 182 return size; 183} 184 185char* os::non_memory_address_word() { 186 // Must never look like an address returned by reserve_memory, 187 // even in its subfields (as defined by the CPU immediate fields, 188 // if the CPU splits constants across multiple instructions). 189 // On SPARC, 0 != %hi(any real address), because there is no 190 // allocation in the first 1Kb of the virtual address space. 191 return (char*) 0; 192} 193 194void os::initialize_thread() {} 195 196void os::print_context(outputStream *st, void *context) { 197 if (context == NULL) return; 198 199 ucontext_t* uc = (ucontext_t*)context; 200 sigcontext* sc = (sigcontext*)context; 201 st->print_cr("Registers:"); 202 203 st->print_cr(" O0=" INTPTR_FORMAT " O1=" INTPTR_FORMAT 204 " O2=" INTPTR_FORMAT " O3=" INTPTR_FORMAT, 205 SIG_REGS(sc).u_regs[CON_O0], 206 SIG_REGS(sc).u_regs[CON_O1], 207 SIG_REGS(sc).u_regs[CON_O2], 208 SIG_REGS(sc).u_regs[CON_O3]); 209 st->print_cr(" O4=" INTPTR_FORMAT " O5=" INTPTR_FORMAT 210 " O6=" INTPTR_FORMAT " O7=" INTPTR_FORMAT, 211 SIG_REGS(sc).u_regs[CON_O4], 212 SIG_REGS(sc).u_regs[CON_O5], 213 SIG_REGS(sc).u_regs[CON_O6], 214 SIG_REGS(sc).u_regs[CON_O7]); 215 216 st->print_cr(" G1=" INTPTR_FORMAT " G2=" INTPTR_FORMAT 217 " G3=" INTPTR_FORMAT " G4=" INTPTR_FORMAT, 218 SIG_REGS(sc).u_regs[CON_G1], 219 SIG_REGS(sc).u_regs[CON_G2], 220 SIG_REGS(sc).u_regs[CON_G3], 221 SIG_REGS(sc).u_regs[CON_G4]); 222 st->print_cr(" G5=" INTPTR_FORMAT " G6=" INTPTR_FORMAT 223 " G7=" INTPTR_FORMAT " Y=" INTPTR_FORMAT, 224 SIG_REGS(sc).u_regs[CON_G5], 225 SIG_REGS(sc).u_regs[CON_G6], 226 SIG_REGS(sc).u_regs[CON_G7], 227 SIG_REGS(sc).y); 228 229 st->print_cr(" PC=" INTPTR_FORMAT " nPC=" INTPTR_FORMAT, 230 SIG_PC(sc), 231 SIG_NPC(sc)); 232 st->cr(); 233 st->cr(); 234 235 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 236 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); 237 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t)); 238 st->cr(); 239 240 // Note: it may be unsafe to inspect memory near pc. For example, pc may 241 // point to garbage if entry point in an nmethod is corrupted. Leave 242 // this at the end, and hope for the best. 243 address pc = os::Linux::ucontext_get_pc(uc); 244 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); 245 print_hex_dump(st, pc - 16, pc + 16, sizeof(char)); 246} 247 248 249address os::Linux::ucontext_get_pc(ucontext_t* uc) { 250 return (address) SIG_PC((sigcontext*)uc); 251} 252 253intptr_t* os::Linux::ucontext_get_sp(ucontext_t *uc) { 254 return (intptr_t*) 255 ((intptr_t)SIG_REGS((sigcontext*)uc).u_regs[CON_O6] + STACK_BIAS); 256} 257 258// not used on Sparc 259intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) { 260 ShouldNotReachHere(); 261 return NULL; 262} 263 264// Utility functions 265 266extern "C" void Fetch32PFI(); 267extern "C" void Fetch32Resume(); 268extern "C" void FetchNPFI(); 269extern "C" void FetchNResume(); 270 271inline static bool checkPrefetch(sigcontext* uc, address pc) { 272 if (pc == (address) Fetch32PFI) { 273 set_cont_address(uc, address(Fetch32Resume)); 274 return true; 275 } 276 if (pc == (address) FetchNPFI) { 277 set_cont_address(uc, address(FetchNResume)); 278 return true; 279 } 280 return false; 281} 282 283inline static bool checkOverflow(sigcontext* uc, 284 address pc, 285 address addr, 286 JavaThread* thread, 287 address* stub) { 288 // check if fault address is within thread stack 289 if (addr < thread->stack_base() && 290 addr >= thread->stack_base() - thread->stack_size()) { 291 // stack overflow 292 if (thread->in_stack_yellow_zone(addr)) { 293 thread->disable_stack_yellow_zone(); 294 if (thread->thread_state() == _thread_in_Java) { 295 // Throw a stack overflow exception. Guard pages will be reenabled 296 // while unwinding the stack. 297 *stub = 298 SharedRuntime::continuation_for_implicit_exception(thread, 299 pc, 300 SharedRuntime::STACK_OVERFLOW); 301 } else { 302 // Thread was in the vm or native code. Return and try to finish. 303 return true; 304 } 305 } else if (thread->in_stack_red_zone(addr)) { 306 // Fatal red zone violation. Disable the guard pages and fall through 307 // to handle_unexpected_exception way down below. 308 thread->disable_stack_red_zone(); 309 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 310 } else { 311 // Accessing stack address below sp may cause SEGV if current 312 // thread has MAP_GROWSDOWN stack. This should only happen when 313 // current thread was created by user code with MAP_GROWSDOWN flag 314 // and then attached to VM. See notes in os_linux.cpp. 315 if (thread->osthread()->expanding_stack() == 0) { 316 thread->osthread()->set_expanding_stack(); 317 if (os::Linux::manually_expand_stack(thread, addr)) { 318 thread->osthread()->clear_expanding_stack(); 319 return true; 320 } 321 thread->osthread()->clear_expanding_stack(); 322 } else { 323 fatal("recursive segv. expanding stack."); 324 } 325 } 326 } 327 return false; 328} 329 330inline static bool checkPollingPage(address pc, address fault, address* stub) { 331 if (fault == os::get_polling_page()) { 332 *stub = SharedRuntime::get_poll_stub(pc); 333 return true; 334 } 335 return false; 336} 337 338inline static bool checkByteBuffer(address pc, address* stub) { 339 // BugId 4454115: A read from a MappedByteBuffer can fault 340 // here if the underlying file has been truncated. 341 // Do not crash the VM in such a case. 342 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 343 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; 344 if (nm != NULL && nm->has_unsafe_access()) { 345 *stub = StubRoutines::handler_for_unsafe_access(); 346 return true; 347 } 348 return false; 349} 350 351inline static bool checkVerifyOops(address pc, address fault, address* stub) { 352 if (pc >= MacroAssembler::_verify_oop_implicit_branch[0] 353 && pc < MacroAssembler::_verify_oop_implicit_branch[1] ) { 354 *stub = MacroAssembler::_verify_oop_implicit_branch[2]; 355 warning("fixed up memory fault in +VerifyOops at address " 356 INTPTR_FORMAT, fault); 357 return true; 358 } 359 return false; 360} 361 362inline static bool checkFPFault(address pc, int code, 363 JavaThread* thread, address* stub) { 364 if (code == FPE_INTDIV || code == FPE_FLTDIV) { 365 *stub = 366 SharedRuntime:: 367 continuation_for_implicit_exception(thread, 368 pc, 369 SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 370 return true; 371 } 372 return false; 373} 374 375inline static bool checkNullPointer(address pc, intptr_t fault, 376 JavaThread* thread, address* stub) { 377 if (!MacroAssembler::needs_explicit_null_check(fault)) { 378 // Determination of interpreter/vtable stub/compiled code null 379 // exception 380 *stub = 381 SharedRuntime:: 382 continuation_for_implicit_exception(thread, pc, 383 SharedRuntime::IMPLICIT_NULL); 384 return true; 385 } 386 return false; 387} 388 389inline static bool checkFastJNIAccess(address pc, address* stub) { 390 address addr = JNI_FastGetField::find_slowcase_pc(pc); 391 if (addr != (address)-1) { 392 *stub = addr; 393 return true; 394 } 395 return false; 396} 397 398inline static bool checkSerializePage(JavaThread* thread, address addr) { 399 return os::is_memory_serialize_page(thread, addr); 400} 401 402inline static bool checkZombie(sigcontext* uc, address* pc, address* stub) { 403 if (nativeInstruction_at(*pc)->is_zombie()) { 404 // zombie method (ld [%g0],%o7 instruction) 405 *stub = SharedRuntime::get_handle_wrong_method_stub(); 406 407 // At the stub it needs to look like a call from the caller of this 408 // method (not a call from the segv site). 409 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 410 return true; 411 } 412 return false; 413} 414 415inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) { 416#ifdef COMPILER2 417 if (nativeInstruction_at(*pc)->is_ic_miss_trap()) { 418#ifdef ASSERT 419#ifdef TIERED 420 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 421 assert(cb->is_compiled_by_c2(), "Wrong compiler"); 422#endif // TIERED 423#endif // ASSERT 424 // Inline cache missed and user trap "Tne G0+ST_RESERVED_FOR_USER_0+2" taken. 425 *stub = SharedRuntime::get_ic_miss_stub(); 426 // At the stub it needs to look like a call from the caller of this 427 // method (not a call from the segv site). 428 *pc = (address)SIG_REGS(uc).u_regs[CON_O7]; 429 return true; 430 } 431#endif // COMPILER2 432 return false; 433} 434 435extern "C" int 436JVM_handle_linux_signal(int sig, 437 siginfo_t* info, 438 void* ucVoid, 439 int abort_if_unrecognized) { 440 // in fact this isn't ucontext_t* at all, but struct sigcontext* 441 // but Linux porting layer uses ucontext_t, so to minimize code change 442 // we cast as needed 443 ucontext_t* ucFake = (ucontext_t*) ucVoid; 444 sigcontext* uc = (sigcontext*)ucVoid; 445 446 Thread* t = ThreadLocalStorage::get_thread_slow(); 447 448 SignalHandlerMark shm(t); 449 450 // Note: it's not uncommon that JNI code uses signal/sigset to install 451 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 452 // or have a SIGILL handler when detecting CPU type). When that happens, 453 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 454 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 455 // that do not require siginfo/ucontext first. 456 457 if (sig == SIGPIPE || sig == SIGXFSZ) { 458 // allow chained handler to go first 459 if (os::Linux::chained_handler(sig, info, ucVoid)) { 460 return true; 461 } else { 462 if (PrintMiscellaneous && (WizardMode || Verbose)) { 463 char buf[64]; 464 warning("Ignoring %s - see bugs 4229104 or 646499219", 465 os::exception_name(sig, buf, sizeof(buf))); 466 } 467 return true; 468 } 469 } 470 471 JavaThread* thread = NULL; 472 VMThread* vmthread = NULL; 473 if (os::Linux::signal_handlers_are_installed) { 474 if (t != NULL ){ 475 if(t->is_Java_thread()) { 476 thread = (JavaThread*)t; 477 } 478 else if(t->is_VM_thread()){ 479 vmthread = (VMThread *)t; 480 } 481 } 482 } 483 484 // decide if this trap can be handled by a stub 485 address stub = NULL; 486 address pc = NULL; 487 address npc = NULL; 488 489 //%note os_trap_1 490 if (info != NULL && uc != NULL && thread != NULL) { 491 pc = address(SIG_PC(uc)); 492 npc = address(SIG_NPC(uc)); 493 494 // Check to see if we caught the safepoint code in the 495 // process of write protecting the memory serialization page. 496 // It write enables the page immediately after protecting it 497 // so we can just return to retry the write. 498 if ((sig == SIGSEGV) && checkSerializePage(thread, (address)info->si_addr)) { 499 // Block current thread until the memory serialize page permission restored. 500 os::block_on_serialize_page_trap(); 501 return 1; 502 } 503 504 if (checkPrefetch(uc, pc)) { 505 return 1; 506 } 507 508 // Handle ALL stack overflow variations here 509 if (sig == SIGSEGV) { 510 if (checkOverflow(uc, pc, (address)info->si_addr, thread, &stub)) { 511 return 1; 512 } 513 } 514 515 if (sig == SIGBUS && 516 thread->thread_state() == _thread_in_vm && 517 thread->doing_unsafe_access()) { 518 stub = StubRoutines::handler_for_unsafe_access(); 519 } 520 521 if (thread->thread_state() == _thread_in_Java) { 522 do { 523 // Java thread running in Java code => find exception handler if any 524 // a fault inside compiled code, the interpreter, or a stub 525 526 if ((sig == SIGSEGV) && checkPollingPage(pc, (address)info->si_addr, &stub)) { 527 break; 528 } 529 530 if ((sig == SIGBUS) && checkByteBuffer(pc, &stub)) { 531 break; 532 } 533 534 if ((sig == SIGSEGV || sig == SIGBUS) && 535 checkVerifyOops(pc, (address)info->si_addr, &stub)) { 536 break; 537 } 538 539 if ((sig == SIGSEGV) && checkZombie(uc, &pc, &stub)) { 540 break; 541 } 542 543 if ((sig == SIGILL) && checkICMiss(uc, &pc, &stub)) { 544 break; 545 } 546 547 if ((sig == SIGFPE) && checkFPFault(pc, info->si_code, thread, &stub)) { 548 break; 549 } 550 551 if ((sig == SIGSEGV) && 552 checkNullPointer(pc, (intptr_t)info->si_addr, thread, &stub)) { 553 break; 554 } 555 } while (0); 556 557 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 558 // and the heap gets shrunk before the field access. 559 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 560 checkFastJNIAccess(pc, &stub); 561 } 562 } 563 564 if (stub != NULL) { 565 // save all thread context in case we need to restore it 566 thread->set_saved_exception_pc(pc); 567 thread->set_saved_exception_npc(npc); 568 set_cont_address(uc, stub); 569 return true; 570 } 571 } 572 573 // signal-chaining 574 if (os::Linux::chained_handler(sig, info, ucVoid)) { 575 return true; 576 } 577 578 if (!abort_if_unrecognized) { 579 // caller wants another chance, so give it to him 580 return false; 581 } 582 583 if (pc == NULL && uc != NULL) { 584 pc = os::Linux::ucontext_get_pc((ucontext_t*)uc); 585 } 586 587 // unmask current signal 588 sigset_t newset; 589 sigemptyset(&newset); 590 sigaddset(&newset, sig); 591 sigprocmask(SIG_UNBLOCK, &newset, NULL); 592 593 VMError err(t, sig, pc, info, ucVoid); 594 err.report_and_die(); 595 596 ShouldNotReachHere(); 597} 598 599void os::Linux::init_thread_fpu_state(void) { 600 // Nothing to do 601} 602 603int os::Linux::get_fpu_control_word() { 604 return 0; 605} 606 607void os::Linux::set_fpu_control_word(int fpu) { 608 // nothing 609} 610 611bool os::is_allocatable(size_t bytes) { 612#ifdef _LP64 613 return true; 614#else 615 if (bytes < 2 * G) { 616 return true; 617 } 618 619 char* addr = reserve_memory(bytes, NULL); 620 621 if (addr != NULL) { 622 release_memory(addr, bytes); 623 } 624 625 return addr != NULL; 626#endif // _LP64 627} 628 629/////////////////////////////////////////////////////////////////////////////// 630// thread stack 631 632size_t os::Linux::min_stack_allowed = 128 * K; 633 634// pthread on Ubuntu is always in floating stack mode 635bool os::Linux::supports_variable_stack_size() { return true; } 636 637// return default stack size for thr_type 638size_t os::Linux::default_stack_size(os::ThreadType thr_type) { 639 // default stack size (compiler thread needs larger stack) 640 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 641 return s; 642} 643 644size_t os::Linux::default_guard_size(os::ThreadType thr_type) { 645 // Creating guard page is very expensive. Java thread has HotSpot 646 // guard page, only enable glibc guard page for non-Java threads. 647 return (thr_type == java_thread ? 0 : page_size()); 648} 649