os_linux_ppc.cpp revision 11658:8a5735c11a84
1/* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2016 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26// no precompiled headers 27#include "asm/assembler.inline.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 "jvm_linux.h" 36#include "memory/allocation.inline.hpp" 37#include "nativeInst_ppc.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// put OS-includes here 58# include <sys/types.h> 59# include <sys/mman.h> 60# include <pthread.h> 61# include <signal.h> 62# include <errno.h> 63# include <dlfcn.h> 64# include <stdlib.h> 65# include <stdio.h> 66# include <unistd.h> 67# include <sys/resource.h> 68# include <pthread.h> 69# include <sys/stat.h> 70# include <sys/time.h> 71# include <sys/utsname.h> 72# include <sys/socket.h> 73# include <sys/wait.h> 74# include <pwd.h> 75# include <poll.h> 76# include <ucontext.h> 77 78 79address os::current_stack_pointer() { 80 intptr_t* csp; 81 82 // inline assembly `mr regno(csp), R1_SP': 83 __asm__ __volatile__ ("mr %0, 1":"=r"(csp):); 84 85 return (address) csp; 86} 87 88char* os::non_memory_address_word() { 89 // Must never look like an address returned by reserve_memory, 90 // even in its subfields (as defined by the CPU immediate fields, 91 // if the CPU splits constants across multiple instructions). 92 93 return (char*) -1; 94} 95 96void os::initialize_thread(Thread *thread) { } 97 98// Frame information (pc, sp, fp) retrieved via ucontext 99// always looks like a C-frame according to the frame 100// conventions in frame_ppc64.hpp. 101address os::Linux::ucontext_get_pc(const ucontext_t * uc) { 102 // On powerpc64, ucontext_t is not selfcontained but contains 103 // a pointer to an optional substructure (mcontext_t.regs) containing the volatile 104 // registers - NIP, among others. 105 // This substructure may or may not be there depending where uc came from: 106 // - if uc was handed over as the argument to a sigaction handler, a pointer to the 107 // substructure was provided by the kernel when calling the signal handler, and 108 // regs->nip can be accessed. 109 // - if uc was filled by getcontext(), it is undefined - getcontext() does not fill 110 // it because the volatile registers are not needed to make setcontext() work. 111 // Hopefully it was zero'd out beforehand. 112 guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_get_pc in sigaction context"); 113 return (address)uc->uc_mcontext.regs->nip; 114} 115 116// modify PC in ucontext. 117// Note: Only use this for an ucontext handed down to a signal handler. See comment 118// in ucontext_get_pc. 119void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { 120 guarantee(uc->uc_mcontext.regs != NULL, "only use ucontext_set_pc in sigaction context"); 121 uc->uc_mcontext.regs->nip = (unsigned long)pc; 122} 123 124intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) { 125 return (intptr_t*)uc->uc_mcontext.regs->gpr[1/*REG_SP*/]; 126} 127 128intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) { 129 return NULL; 130} 131 132ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 133 intptr_t** ret_sp, intptr_t** ret_fp) { 134 135 ExtendedPC epc; 136 const ucontext_t* uc = (const ucontext_t*)ucVoid; 137 138 if (uc != NULL) { 139 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 140 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); 141 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc); 142 } else { 143 // construct empty ExtendedPC for return value checking 144 epc = ExtendedPC(NULL); 145 if (ret_sp) *ret_sp = (intptr_t *)NULL; 146 if (ret_fp) *ret_fp = (intptr_t *)NULL; 147 } 148 149 return epc; 150} 151 152frame os::fetch_frame_from_context(const void* ucVoid) { 153 intptr_t* sp; 154 intptr_t* fp; 155 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 156 return frame(sp, epc.pc()); 157} 158 159bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 160 address pc = (address) os::Linux::ucontext_get_pc(uc); 161 if (Interpreter::contains(pc)) { 162 // Interpreter performs stack banging after the fixed frame header has 163 // been generated while the compilers perform it before. To maintain 164 // semantic consistency between interpreted and compiled frames, the 165 // method returns the Java sender of the current frame. 166 *fr = os::fetch_frame_from_context(uc); 167 if (!fr->is_first_java_frame()) { 168 assert(fr->safe_for_sender(thread), "Safety check"); 169 *fr = fr->java_sender(); 170 } 171 } else { 172 // More complex code with compiled code. 173 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 174 CodeBlob* cb = CodeCache::find_blob(pc); 175 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 176 // Not sure where the pc points to, fallback to default 177 // stack overflow handling. In compiled code, we bang before 178 // the frame is complete. 179 return false; 180 } else { 181 intptr_t* fp = os::Linux::ucontext_get_fp(uc); 182 intptr_t* sp = os::Linux::ucontext_get_sp(uc); 183 *fr = frame(sp, (address)*sp); 184 if (!fr->is_java_frame()) { 185 assert(fr->safe_for_sender(thread), "Safety check"); 186 assert(!fr->is_first_frame(), "Safety check"); 187 *fr = fr->java_sender(); 188 } 189 } 190 } 191 assert(fr->is_java_frame(), "Safety check"); 192 return true; 193} 194 195frame os::get_sender_for_C_frame(frame* fr) { 196 if (*fr->sp() == 0) { 197 // fr is the last C frame 198 return frame(NULL, NULL); 199 } 200 return frame(fr->sender_sp(), fr->sender_pc()); 201} 202 203 204frame os::current_frame() { 205 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); 206 // hack. 207 frame topframe(csp, (address)0x8); 208 // return sender of current topframe which hopefully has pc != NULL. 209 return os::get_sender_for_C_frame(&topframe); 210} 211 212// Utility functions 213 214extern "C" JNIEXPORT int 215JVM_handle_linux_signal(int sig, 216 siginfo_t* info, 217 void* ucVoid, 218 int abort_if_unrecognized) { 219 ucontext_t* uc = (ucontext_t*) ucVoid; 220 221 Thread* t = Thread::current_or_null_safe(); 222 223 SignalHandlerMark shm(t); 224 225 // Note: it's not uncommon that JNI code uses signal/sigset to install 226 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 227 // or have a SIGILL handler when detecting CPU type). When that happens, 228 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 229 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 230 // that do not require siginfo/ucontext first. 231 232 if (sig == SIGPIPE) { 233 if (os::Linux::chained_handler(sig, info, ucVoid)) { 234 return true; 235 } else { 236 // Ignoring SIGPIPE - see bugs 4229104 237 return true; 238 } 239 } 240 241 JavaThread* thread = NULL; 242 VMThread* vmthread = NULL; 243 if (os::Linux::signal_handlers_are_installed) { 244 if (t != NULL) { 245 if(t->is_Java_thread()) { 246 thread = (JavaThread*)t; 247 } else if(t->is_VM_thread()) { 248 vmthread = (VMThread *)t; 249 } 250 } 251 } 252 253 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make 254 // it work if no associated JavaThread object exists. 255 if (uc) { 256 address const pc = os::Linux::ucontext_get_pc(uc); 257 if (pc && StubRoutines::is_safefetch_fault(pc)) { 258 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 259 return true; 260 } 261 } 262 263 // decide if this trap can be handled by a stub 264 address stub = NULL; 265 address pc = NULL; 266 267 //%note os_trap_1 268 if (info != NULL && uc != NULL && thread != NULL) { 269 pc = (address) os::Linux::ucontext_get_pc(uc); 270 271 // Handle ALL stack overflow variations here 272 if (sig == SIGSEGV) { 273 // Si_addr may not be valid due to a bug in the linux-ppc64 kernel (see 274 // comment below). Use get_stack_bang_address instead of si_addr. 275 address addr = ((NativeInstruction*)pc)->get_stack_bang_address(uc); 276 277 // Check if fault address is within thread stack. 278 if (thread->on_local_stack(addr)) { 279 // stack overflow 280 if (thread->in_stack_yellow_reserved_zone(addr)) { 281 if (thread->thread_state() == _thread_in_Java) { 282 if (thread->in_stack_reserved_zone(addr)) { 283 frame fr; 284 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { 285 assert(fr.is_java_frame(), "Must be a Javac frame"); 286 frame activation = 287 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 288 if (activation.sp() != NULL) { 289 thread->disable_stack_reserved_zone(); 290 if (activation.is_interpreted_frame()) { 291 thread->set_reserved_stack_activation((address)activation.fp()); 292 } else { 293 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 294 } 295 return 1; 296 } 297 } 298 } 299 // Throw a stack overflow exception. 300 // Guard pages will be reenabled while unwinding the stack. 301 thread->disable_stack_yellow_reserved_zone(); 302 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 303 } else { 304 // Thread was in the vm or native code. Return and try to finish. 305 thread->disable_stack_yellow_reserved_zone(); 306 return 1; 307 } 308 } else if (thread->in_stack_red_zone(addr)) { 309 // Fatal red zone violation. Disable the guard pages and fall through 310 // to handle_unexpected_exception way down below. 311 thread->disable_stack_red_zone(); 312 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 313 314 // This is a likely cause, but hard to verify. Let's just print 315 // it as a hint. 316 tty->print_raw_cr("Please check if any of your loaded .so files has " 317 "enabled executable stack (see man page execstack(8))"); 318 } else { 319 // Accessing stack address below sp may cause SEGV if current 320 // thread has MAP_GROWSDOWN stack. This should only happen when 321 // current thread was created by user code with MAP_GROWSDOWN flag 322 // and then attached to VM. See notes in os_linux.cpp. 323 if (thread->osthread()->expanding_stack() == 0) { 324 thread->osthread()->set_expanding_stack(); 325 if (os::Linux::manually_expand_stack(thread, addr)) { 326 thread->osthread()->clear_expanding_stack(); 327 return 1; 328 } 329 thread->osthread()->clear_expanding_stack(); 330 } else { 331 fatal("recursive segv. expanding stack."); 332 } 333 } 334 } 335 } 336 337 if (thread->thread_state() == _thread_in_Java) { 338 // Java thread running in Java code => find exception handler if any 339 // a fault inside compiled code, the interpreter, or a stub 340 341 // A VM-related SIGILL may only occur if we are not in the zero page. 342 // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else 343 // in the zero page, because it is filled with 0x0. We ignore 344 // explicit SIGILLs in the zero page. 345 if (sig == SIGILL && (pc < (address) 0x200)) { 346 if (TraceTraps) { 347 tty->print_raw_cr("SIGILL happened inside zero page."); 348 } 349 goto report_and_die; 350 } 351 352 CodeBlob *cb = NULL; 353 // Handle signal from NativeJump::patch_verified_entry(). 354 if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) || 355 (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) { 356 if (TraceTraps) { 357 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 358 } 359 stub = SharedRuntime::get_handle_wrong_method_stub(); 360 } 361 362 else if (sig == SIGSEGV && 363 // A linux-ppc64 kernel before 2.6.6 doesn't set si_addr on some segfaults 364 // in 64bit mode (cf. http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.6), 365 // especially when we try to read from the safepoint polling page. So the check 366 // (address)info->si_addr == os::get_standard_polling_page() 367 // doesn't work for us. We use: 368 ((NativeInstruction*)pc)->is_safepoint_poll() && 369 CodeCache::contains((void*) pc) && 370 ((cb = CodeCache::find_blob(pc)) != NULL) && 371 cb->is_compiled()) { 372 if (TraceTraps) { 373 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 374 } 375 stub = SharedRuntime::get_poll_stub(pc); 376 } 377 378 // SIGTRAP-based ic miss check in compiled code. 379 else if (sig == SIGTRAP && TrapBasedICMissChecks && 380 nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) { 381 if (TraceTraps) { 382 tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc)); 383 } 384 stub = SharedRuntime::get_ic_miss_stub(); 385 } 386 387 // SIGTRAP-based implicit null check in compiled code. 388 else if (sig == SIGTRAP && TrapBasedNullChecks && 389 nativeInstruction_at(pc)->is_sigtrap_null_check()) { 390 if (TraceTraps) { 391 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc)); 392 } 393 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 394 } 395 396 // SIGSEGV-based implicit null check in compiled code. 397 else if (sig == SIGSEGV && ImplicitNullChecks && 398 CodeCache::contains((void*) pc) && 399 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { 400 if (TraceTraps) { 401 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 402 } 403 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 404 } 405 406#ifdef COMPILER2 407 // SIGTRAP-based implicit range check in compiled code. 408 else if (sig == SIGTRAP && TrapBasedRangeChecks && 409 nativeInstruction_at(pc)->is_sigtrap_range_check()) { 410 if (TraceTraps) { 411 tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", p2i(pc)); 412 } 413 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 414 } 415#endif 416 else if (sig == SIGBUS) { 417 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 418 // underlying file has been truncated. Do not crash the VM in such a case. 419 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 420 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 421 if (nm != NULL && nm->has_unsafe_access()) { 422 address next_pc = pc + 4; 423 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 424 os::Linux::ucontext_set_pc(uc, next_pc); 425 return true; 426 } 427 } 428 } 429 430 else { // thread->thread_state() != _thread_in_Java 431 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { 432 // SIGILL must be caused by VM_Version::determine_features(). 433 *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL, 434 // flushing of icache is not necessary. 435 stub = pc + 4; // continue with next instruction. 436 } 437 else if (thread->thread_state() == _thread_in_vm && 438 sig == SIGBUS && thread->doing_unsafe_access()) { 439 address next_pc = pc + 4; 440 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc); 441 os::Linux::ucontext_set_pc(uc, pc + 4); 442 return true; 443 } 444 } 445 446 // Check to see if we caught the safepoint code in the 447 // process of write protecting the memory serialization page. 448 // It write enables the page immediately after protecting it 449 // so we can just return to retry the write. 450 if ((sig == SIGSEGV) && 451 // Si_addr may not be valid due to a bug in the linux-ppc64 kernel (see comment above). 452 // Use is_memory_serialization instead of si_addr. 453 ((NativeInstruction*)pc)->is_memory_serialization(thread, ucVoid)) { 454 // Synchronization problem in the pseudo memory barrier code (bug id 6546278) 455 // Block current thread until the memory serialize page permission restored. 456 os::block_on_serialize_page_trap(); 457 return true; 458 } 459 } 460 461 if (stub != NULL) { 462 // Save all thread context in case we need to restore it. 463 if (thread != NULL) thread->set_saved_exception_pc(pc); 464 os::Linux::ucontext_set_pc(uc, stub); 465 return true; 466 } 467 468 // signal-chaining 469 if (os::Linux::chained_handler(sig, info, ucVoid)) { 470 return true; 471 } 472 473 if (!abort_if_unrecognized) { 474 // caller wants another chance, so give it to him 475 return false; 476 } 477 478 if (pc == NULL && uc != NULL) { 479 pc = os::Linux::ucontext_get_pc(uc); 480 } 481 482report_and_die: 483 // unmask current signal 484 sigset_t newset; 485 sigemptyset(&newset); 486 sigaddset(&newset, sig); 487 sigprocmask(SIG_UNBLOCK, &newset, NULL); 488 489 VMError::report_and_die(t, sig, pc, info, ucVoid); 490 491 ShouldNotReachHere(); 492 return false; 493} 494 495void os::Linux::init_thread_fpu_state(void) { 496 // Disable FP exceptions. 497 __asm__ __volatile__ ("mtfsfi 6,0"); 498} 499 500int os::Linux::get_fpu_control_word(void) { 501 // x86 has problems with FPU precision after pthread_cond_timedwait(). 502 // nothing to do on ppc64. 503 return 0; 504} 505 506void os::Linux::set_fpu_control_word(int fpu_control) { 507 // x86 has problems with FPU precision after pthread_cond_timedwait(). 508 // nothing to do on ppc64. 509} 510 511//////////////////////////////////////////////////////////////////////////////// 512// thread stack 513 514size_t os::Linux::min_stack_allowed = 128*K; 515 516// return default stack size for thr_type 517size_t os::Linux::default_stack_size(os::ThreadType thr_type) { 518 // default stack size (compiler thread needs larger stack) 519 // Notice that the setting for compiler threads here have no impact 520 // because of the strange 'fallback logic' in os::create_thread(). 521 // Better set CompilerThreadStackSize in globals_<os_cpu>.hpp if you want to 522 // specify a different stack size for compiler threads! 523 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K); 524 return s; 525} 526 527size_t os::Linux::default_guard_size(os::ThreadType thr_type) { 528 return 2 * page_size(); 529} 530 531// Java thread: 532// 533// Low memory addresses 534// +------------------------+ 535// | |\ JavaThread created by VM does not have glibc 536// | glibc guard page | - guard, attached Java thread usually has 537// | |/ 1 page glibc guard. 538// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() 539// | |\ 540// | HotSpot Guard Pages | - red and yellow pages 541// | |/ 542// +------------------------+ JavaThread::stack_yellow_zone_base() 543// | |\ 544// | Normal Stack | - 545// | |/ 546// P2 +------------------------+ Thread::stack_base() 547// 548// Non-Java thread: 549// 550// Low memory addresses 551// +------------------------+ 552// | |\ 553// | glibc guard page | - usually 1 page 554// | |/ 555// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() 556// | |\ 557// | Normal Stack | - 558// | |/ 559// P2 +------------------------+ Thread::stack_base() 560// 561// ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from 562// pthread_attr_getstack() 563 564static void current_stack_region(address * bottom, size_t * size) { 565 if (os::Linux::is_initial_thread()) { 566 // initial thread needs special handling because pthread_getattr_np() 567 // may return bogus value. 568 *bottom = os::Linux::initial_thread_stack_bottom(); 569 *size = os::Linux::initial_thread_stack_size(); 570 } else { 571 pthread_attr_t attr; 572 573 int rslt = pthread_getattr_np(pthread_self(), &attr); 574 575 // JVM needs to know exact stack location, abort if it fails 576 if (rslt != 0) { 577 if (rslt == ENOMEM) { 578 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); 579 } else { 580 fatal("pthread_getattr_np failed with errno = %d", rslt); 581 } 582 } 583 584 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { 585 fatal("Can not locate current stack attributes!"); 586 } 587 588 pthread_attr_destroy(&attr); 589 590 } 591 assert(os::current_stack_pointer() >= *bottom && 592 os::current_stack_pointer() < *bottom + *size, "just checking"); 593} 594 595address os::current_stack_base() { 596 address bottom; 597 size_t size; 598 current_stack_region(&bottom, &size); 599 return (bottom + size); 600} 601 602size_t os::current_stack_size() { 603 // stack size includes normal stack and HotSpot guard pages 604 address bottom; 605 size_t size; 606 current_stack_region(&bottom, &size); 607 return size; 608} 609 610///////////////////////////////////////////////////////////////////////////// 611// helper functions for fatal error handler 612 613void os::print_context(outputStream *st, const void *context) { 614 if (context == NULL) return; 615 616 const ucontext_t* uc = (const ucontext_t*)context; 617 618 st->print_cr("Registers:"); 619 st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->nip); 620 st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.regs->link); 621 st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.regs->ctr); 622 st->cr(); 623 for (int i = 0; i < 32; i++) { 624 st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.regs->gpr[i]); 625 if (i % 3 == 2) st->cr(); 626 } 627 st->cr(); 628 st->cr(); 629 630 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 631 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 632 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 633 st->cr(); 634 635 // Note: it may be unsafe to inspect memory near pc. For example, pc may 636 // point to garbage if entry point in an nmethod is corrupted. Leave 637 // this at the end, and hope for the best. 638 address pc = os::Linux::ucontext_get_pc(uc); 639 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 640 print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4); 641 st->cr(); 642} 643 644void os::print_register_info(outputStream *st, const void *context) { 645 if (context == NULL) return; 646 647 const ucontext_t *uc = (const ucontext_t*)context; 648 649 st->print_cr("Register to memory mapping:"); 650 st->cr(); 651 652 // this is only for the "general purpose" registers 653 for (int i = 0; i < 32; i++) { 654 st->print("r%-2d=", i); 655 print_location(st, uc->uc_mcontext.regs->gpr[i]); 656 } 657 st->cr(); 658} 659 660extern "C" { 661 int SpinPause() { 662 return 0; 663 } 664} 665 666#ifndef PRODUCT 667void os::verify_stack_alignment() { 668 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 669} 670#endif 671 672int os::extra_bang_size_in_bytes() { 673 // PPC does not require the additional stack bang. 674 return 0; 675} 676