1 /* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. 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/macroAssembler.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmSymbols.hpp" 31 #include "code/icBuffer.hpp" 32 #include "code/vtableStubs.hpp" 33 #include "code/nativeInst.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "jvm_linux.h" 36 #include "memory/allocation.inline.hpp" 37 #include "mutex_linux.inline.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 #ifdef BUILTIN_SIM 57 #include "../../../../../../simulator/simulator.hpp" 58 #endif 59 60 // put OS-includes here 61 # include <sys/types.h> 62 # include <sys/mman.h> 63 # include <pthread.h> 64 # include <signal.h> 65 # include <errno.h> 66 # include <dlfcn.h> 67 # include <stdlib.h> 68 # include <stdio.h> 69 # include <unistd.h> 70 # include <sys/resource.h> 71 # include <pthread.h> 72 # include <sys/stat.h> 73 # include <sys/time.h> 74 # include <sys/utsname.h> 75 # include <sys/socket.h> 76 # include <sys/wait.h> 77 # include <pwd.h> 78 # include <poll.h> 79 # include <ucontext.h> 80 # include <fpu_control.h> 81 82 #ifdef BUILTIN_SIM 83 #define REG_SP REG_RSP 84 #define REG_PC REG_RIP 85 #define REG_FP REG_RBP 86 #define SPELL_REG_SP "rsp" 87 #define SPELL_REG_FP "rbp" 88 #else 89 #define REG_FP 29 90 91 #define SPELL_REG_SP "sp" 92 #define SPELL_REG_FP "x29" 93 #endif 94 95 address os::current_stack_pointer() { 96 register void *esp __asm__ (SPELL_REG_SP); 97 return (address) esp; 98 } 99 100 char* os::non_memory_address_word() { 101 // Must never look like an address returned by reserve_memory, 102 // even in its subfields (as defined by the CPU immediate fields, 103 // if the CPU splits constants across multiple instructions). 104 105 return (char*) 0xffffffffffff; 106 } 107 108 void os::initialize_thread(Thread *thr) { 109 } 110 111 address os::Linux::ucontext_get_pc(ucontext_t * uc) { 112 #ifdef BUILTIN_SIM 113 return (address)uc->uc_mcontext.gregs[REG_PC]; 114 #else 115 return (address)uc->uc_mcontext.pc; 116 #endif 117 } 118 119 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { 120 #ifdef BUILTIN_SIM 121 uc->uc_mcontext.gregs[REG_PC] = (intptr_t)pc; 122 #else 123 uc->uc_mcontext.pc = (intptr_t)pc; 124 #endif 125 } 126 127 intptr_t* os::Linux::ucontext_get_sp(ucontext_t * uc) { 128 #ifdef BUILTIN_SIM 129 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; 130 #else 131 return (intptr_t*)uc->uc_mcontext.sp; 132 #endif 133 } 134 135 intptr_t* os::Linux::ucontext_get_fp(ucontext_t * uc) { 136 #ifdef BUILTIN_SIM 137 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; 138 #else 139 return (intptr_t*)uc->uc_mcontext.regs[REG_FP]; 140 #endif 141 } 142 143 // For Forte Analyzer AsyncGetCallTrace profiling support - thread 144 // is currently interrupted by SIGPROF. 145 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal 146 // frames. Currently we don't do that on Linux, so it's the same as 147 // os::fetch_frame_from_context(). 148 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 149 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { 150 151 assert(thread != NULL, "just checking"); 152 assert(ret_sp != NULL, "just checking"); 153 assert(ret_fp != NULL, "just checking"); 154 155 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 156 } 157 158 ExtendedPC os::fetch_frame_from_context(void* ucVoid, 159 intptr_t** ret_sp, intptr_t** ret_fp) { 160 161 ExtendedPC epc; 162 ucontext_t* uc = (ucontext_t*)ucVoid; 163 164 if (uc != NULL) { 165 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 166 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); 167 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc); 168 } else { 169 // construct empty ExtendedPC for return value checking 170 epc = ExtendedPC(NULL); 171 if (ret_sp) *ret_sp = (intptr_t *)NULL; 172 if (ret_fp) *ret_fp = (intptr_t *)NULL; 173 } 174 175 return epc; 176 } 177 178 frame os::fetch_frame_from_context(void* ucVoid) { 179 intptr_t* sp; 180 intptr_t* fp; 181 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 182 return frame(sp, fp, epc.pc()); 183 } 184 185 // By default, gcc always saves frame pointer rfp on this stack. This 186 // may get turned off by -fomit-frame-pointer. 187 frame os::get_sender_for_C_frame(frame* fr) { 188 #ifdef BUILTIN_SIM 189 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 190 #else 191 return frame(fr->link(), fr->link(), fr->sender_pc()); 192 #endif 193 } 194 195 intptr_t* _get_previous_fp() { 196 register intptr_t **ebp __asm__ (SPELL_REG_FP); 197 return (intptr_t*) *ebp; // we want what it points to. 198 } 199 200 201 frame os::current_frame() { 202 intptr_t* fp = _get_previous_fp(); 203 frame myframe((intptr_t*)os::current_stack_pointer(), 204 (intptr_t*)fp, 205 CAST_FROM_FN_PTR(address, os::current_frame)); 206 if (os::is_first_C_frame(&myframe)) { 207 // stack is not walkable 208 return frame(); 209 } else { 210 return os::get_sender_for_C_frame(&myframe); 211 } 212 } 213 214 // Utility functions 215 216 // From IA32 System Programming Guide 217 enum { 218 trap_page_fault = 0xE 219 }; 220 221 #ifdef BUILTIN_SIM 222 extern "C" void Fetch32PFI () ; 223 extern "C" void Fetch32Resume () ; 224 extern "C" void FetchNPFI () ; 225 extern "C" void FetchNResume () ; 226 #endif 227 228 // An operation in Unsafe has faulted. We're going to return to the 229 // instruction after the faulting load or store. We also set 230 // pending_unsafe_access_error so that at some point in the future our 231 // user will get a helpful message. 232 static address handle_unsafe_access(JavaThread* thread, address pc) { 233 // pc is the instruction which we must emulate 234 // doing a no-op is fine: return garbage from the load 235 // therefore, compute npc 236 address npc = pc + NativeCall::instruction_size; 237 238 // request an async exception 239 thread->set_pending_unsafe_access_error(); 240 241 // return address of next instruction to execute 242 return npc; 243 } 244 245 extern "C" JNIEXPORT int 246 JVM_handle_linux_signal(int sig, 247 siginfo_t* info, 248 void* ucVoid, 249 int abort_if_unrecognized) { 250 ucontext_t* uc = (ucontext_t*) ucVoid; 251 252 Thread* t = ThreadLocalStorage::thread(); // can't use Thread::current() 253 254 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 255 // (no destructors can be run) 256 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 257 258 SignalHandlerMark shm(t); 259 260 // Note: it's not uncommon that JNI code uses signal/sigset to install 261 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 262 // or have a SIGILL handler when detecting CPU type). When that happens, 263 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 264 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 265 // that do not require siginfo/ucontext first. 266 267 if (sig == SIGPIPE || sig == SIGXFSZ) { 268 // allow chained handler to go first 269 if (os::Linux::chained_handler(sig, info, ucVoid)) { 270 return true; 271 } else { 272 if (PrintMiscellaneous && (WizardMode || Verbose)) { 273 char buf[64]; 274 warning("Ignoring %s - see bugs 4229104 or 646499219", 275 os::exception_name(sig, buf, sizeof(buf))); 276 } 277 return true; 278 } 279 } 280 281 JavaThread* thread = NULL; 282 VMThread* vmthread = NULL; 283 if (os::Linux::signal_handlers_are_installed) { 284 if (t != NULL ){ 285 if(t->is_Java_thread()) { 286 thread = (JavaThread*)t; 287 } 288 else if(t->is_VM_thread()){ 289 vmthread = (VMThread *)t; 290 } 291 } 292 } 293 /* 294 NOTE: does not seem to work on linux. 295 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 296 // can't decode this kind of signal 297 info = NULL; 298 } else { 299 assert(sig == info->si_signo, "bad siginfo"); 300 } 301 */ 302 // decide if this trap can be handled by a stub 303 address stub = NULL; 304 305 address pc = NULL; 306 307 //%note os_trap_1 308 if (info != NULL && uc != NULL && thread != NULL) { 309 pc = (address) os::Linux::ucontext_get_pc(uc); 310 311 #ifdef BUILTIN_SIM 312 if (pc == (address) Fetch32PFI) { 313 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; 314 return 1 ; 315 } 316 if (pc == (address) FetchNPFI) { 317 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ; 318 return 1 ; 319 } 320 #else 321 if (StubRoutines::is_safefetch_fault(pc)) { 322 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 323 return 1; 324 } 325 #endif 326 327 // Handle ALL stack overflow variations here 328 if (sig == SIGSEGV) { 329 address addr = (address) info->si_addr; 330 331 // check if fault address is within thread stack 332 if (addr < thread->stack_base() && 333 addr >= thread->stack_base() - thread->stack_size()) { 334 // stack overflow 335 if (thread->in_stack_yellow_zone(addr)) { 336 thread->disable_stack_yellow_zone(); 337 if (thread->thread_state() == _thread_in_Java) { 338 // Throw a stack overflow exception. Guard pages will be reenabled 339 // while unwinding the stack. 340 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 341 } else { 342 // Thread was in the vm or native code. Return and try to finish. 343 return 1; 344 } 345 } else if (thread->in_stack_red_zone(addr)) { 346 // Fatal red zone violation. Disable the guard pages and fall through 347 // to handle_unexpected_exception way down below. 348 thread->disable_stack_red_zone(); 349 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 350 351 // This is a likely cause, but hard to verify. Let's just print 352 // it as a hint. 353 tty->print_raw_cr("Please check if any of your loaded .so files has " 354 "enabled executable stack (see man page execstack(8))"); 355 } else { 356 // Accessing stack address below sp may cause SEGV if current 357 // thread has MAP_GROWSDOWN stack. This should only happen when 358 // current thread was created by user code with MAP_GROWSDOWN flag 359 // and then attached to VM. See notes in os_linux.cpp. 360 if (thread->osthread()->expanding_stack() == 0) { 361 thread->osthread()->set_expanding_stack(); 362 if (os::Linux::manually_expand_stack(thread, addr)) { 363 thread->osthread()->clear_expanding_stack(); 364 return 1; 365 } 366 thread->osthread()->clear_expanding_stack(); 367 } else { 368 fatal("recursive segv. expanding stack."); 369 } 370 } 371 } 372 } 373 374 if (thread->thread_state() == _thread_in_Java) { 375 // Java thread running in Java code => find exception handler if any 376 // a fault inside compiled code, the interpreter, or a stub 377 378 // Handle signal from NativeJump::patch_verified_entry(). 379 if ((sig == SIGILL || sig == SIGTRAP) 380 && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { 381 if (TraceTraps) { 382 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 383 } 384 stub = SharedRuntime::get_handle_wrong_method_stub(); 385 } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 386 stub = SharedRuntime::get_poll_stub(pc); 387 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { 388 // BugId 4454115: A read from a MappedByteBuffer can fault 389 // here if the underlying file has been truncated. 390 // Do not crash the VM in such a case. 391 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 392 nmethod* nm = (cb != NULL && cb->is_nmethod()) ? (nmethod*)cb : NULL; 393 if (nm != NULL && nm->has_unsafe_access()) { 394 stub = handle_unsafe_access(thread, pc); 395 } 396 } 397 else 398 399 if (sig == SIGFPE && 400 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { 401 stub = 402 SharedRuntime:: 403 continuation_for_implicit_exception(thread, 404 pc, 405 SharedRuntime:: 406 IMPLICIT_DIVIDE_BY_ZERO); 407 } else if (sig == SIGSEGV && 408 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { 409 // Determination of interpreter/vtable stub/compiled code null exception 410 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 411 } 412 } else if (thread->thread_state() == _thread_in_vm && 413 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ 414 thread->doing_unsafe_access()) { 415 stub = handle_unsafe_access(thread, pc); 416 } 417 418 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 419 // and the heap gets shrunk before the field access. 420 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 421 address addr = JNI_FastGetField::find_slowcase_pc(pc); 422 if (addr != (address)-1) { 423 stub = addr; 424 } 425 } 426 427 // Check to see if we caught the safepoint code in the 428 // process of write protecting the memory serialization page. 429 // It write enables the page immediately after protecting it 430 // so we can just return to retry the write. 431 if ((sig == SIGSEGV) && 432 os::is_memory_serialize_page(thread, (address) info->si_addr)) { 433 // Block current thread until the memory serialize page permission restored. 434 os::block_on_serialize_page_trap(); 435 return true; 436 } 437 } 438 439 if (stub != NULL) { 440 // save all thread context in case we need to restore it 441 if (thread != NULL) thread->set_saved_exception_pc(pc); 442 443 os::Linux::ucontext_set_pc(uc, stub); 444 return true; 445 } 446 447 // signal-chaining 448 if (os::Linux::chained_handler(sig, info, ucVoid)) { 449 return true; 450 } 451 452 if (!abort_if_unrecognized) { 453 // caller wants another chance, so give it to him 454 return false; 455 } 456 457 if (pc == NULL && uc != NULL) { 458 pc = os::Linux::ucontext_get_pc(uc); 459 } 460 461 // unmask current signal 462 sigset_t newset; 463 sigemptyset(&newset); 464 sigaddset(&newset, sig); 465 sigprocmask(SIG_UNBLOCK, &newset, NULL); 466 467 VMError::report_and_die(t, sig, pc, info, ucVoid); 468 469 ShouldNotReachHere(); 470 return true; // Mute compiler 471 } 472 473 void os::Linux::init_thread_fpu_state(void) { 474 } 475 476 int os::Linux::get_fpu_control_word(void) { 477 return 0; 478 } 479 480 void os::Linux::set_fpu_control_word(int fpu_control) { 481 } 482 483 // Check that the linux kernel version is 2.4 or higher since earlier 484 // versions do not support SSE without patches. 485 bool os::supports_sse() { 486 return true; 487 } 488 489 bool os::is_allocatable(size_t bytes) { 490 return true; 491 } 492 493 //////////////////////////////////////////////////////////////////////////////// 494 // thread stack 495 496 size_t os::Linux::min_stack_allowed = 64 * K; 497 498 // return default stack size for thr_type 499 size_t os::Linux::default_stack_size(os::ThreadType thr_type) { 500 // default stack size (compiler thread needs larger stack) 501 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 502 return s; 503 } 504 505 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { 506 // Creating guard page is very expensive. Java thread has HotSpot 507 // guard page, only enable glibc guard page for non-Java threads. 508 return (thr_type == java_thread ? 0 : page_size()); 509 } 510 511 // Java thread: 512 // 513 // Low memory addresses 514 // +------------------------+ 515 // | |\ JavaThread created by VM does not have glibc 516 // | glibc guard page | - guard, attached Java thread usually has 517 // | |/ 1 page glibc guard. 518 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() 519 // | |\ 520 // | HotSpot Guard Pages | - red and yellow pages 521 // | |/ 522 // +------------------------+ JavaThread::stack_yellow_zone_base() 523 // | |\ 524 // | Normal Stack | - 525 // | |/ 526 // P2 +------------------------+ Thread::stack_base() 527 // 528 // Non-Java thread: 529 // 530 // Low memory addresses 531 // +------------------------+ 532 // | |\ 533 // | glibc guard page | - usually 1 page 534 // | |/ 535 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() 536 // | |\ 537 // | Normal Stack | - 538 // | |/ 539 // P2 +------------------------+ Thread::stack_base() 540 // 541 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from 542 // pthread_attr_getstack() 543 544 static void current_stack_region(address * bottom, size_t * size) { 545 if (os::Linux::is_initial_thread()) { 546 // initial thread needs special handling because pthread_getattr_np() 547 // may return bogus value. 548 *bottom = os::Linux::initial_thread_stack_bottom(); 549 *size = os::Linux::initial_thread_stack_size(); 550 } else { 551 pthread_attr_t attr; 552 553 int rslt = pthread_getattr_np(pthread_self(), &attr); 554 555 // JVM needs to know exact stack location, abort if it fails 556 if (rslt != 0) { 557 if (rslt == ENOMEM) { 558 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); 559 } else { 560 fatal("pthread_getattr_np failed with errno = %d", rslt); 561 } 562 } 563 564 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { 565 fatal("Can not locate current stack attributes!"); 566 } 567 568 pthread_attr_destroy(&attr); 569 570 } 571 assert(os::current_stack_pointer() >= *bottom && 572 os::current_stack_pointer() < *bottom + *size, "just checking"); 573 } 574 575 address os::current_stack_base() { 576 address bottom; 577 size_t size; 578 current_stack_region(&bottom, &size); 579 return (bottom + size); 580 } 581 582 size_t os::current_stack_size() { 583 // stack size includes normal stack and HotSpot guard pages 584 address bottom; 585 size_t size; 586 current_stack_region(&bottom, &size); 587 return size; 588 } 589 590 ///////////////////////////////////////////////////////////////////////////// 591 // helper functions for fatal error handler 592 593 void os::print_context(outputStream *st, void *context) { 594 if (context == NULL) return; 595 596 ucontext_t *uc = (ucontext_t*)context; 597 st->print_cr("Registers:"); 598 #ifdef BUILTIN_SIM 599 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 600 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 601 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 602 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 603 st->cr(); 604 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 605 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 606 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 607 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 608 st->cr(); 609 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 610 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 611 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 612 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 613 st->cr(); 614 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 615 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 616 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 617 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 618 st->cr(); 619 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 620 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); 621 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]); 622 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]); 623 st->cr(); 624 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]); 625 st->cr(); 626 #else 627 for (int r = 0; r < 31; r++) 628 st->print_cr( "R%d=" INTPTR_FORMAT, r, (size_t)uc->uc_mcontext.regs[r]); 629 #endif 630 st->cr(); 631 632 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 633 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 634 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 635 st->cr(); 636 637 // Note: it may be unsafe to inspect memory near pc. For example, pc may 638 // point to garbage if entry point in an nmethod is corrupted. Leave 639 // this at the end, and hope for the best. 640 address pc = os::Linux::ucontext_get_pc(uc); 641 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 642 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 643 } 644 645 void os::print_register_info(outputStream *st, void *context) { 646 if (context == NULL) return; 647 648 ucontext_t *uc = (ucontext_t*)context; 649 650 st->print_cr("Register to memory mapping:"); 651 st->cr(); 652 653 // this is horrendously verbose but the layout of the registers in the 654 // context does not match how we defined our abstract Register set, so 655 // we can't just iterate through the gregs area 656 657 // this is only for the "general purpose" registers 658 659 #ifdef BUILTIN_SIM 660 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 661 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 662 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 663 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 664 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 665 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 666 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 667 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 668 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 669 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 670 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 671 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 672 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 673 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 674 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 675 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 676 #else 677 for (int r = 0; r < 31; r++) 678 st->print_cr( "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]); 679 #endif 680 st->cr(); 681 } 682 683 void os::setup_fpu() { 684 } 685 686 #ifndef PRODUCT 687 void os::verify_stack_alignment() { 688 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 689 } 690 #endif 691 692 int os::extra_bang_size_in_bytes() { 693 // AArch64 does not require the additional stack bang. 694 return 0; 695 } 696 697 extern "C" { 698 int SpinPause() { 699 return 0; 700 } 701 702 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { 703 if (from > to) { 704 jshort *end = from + count; 705 while (from < end) 706 *(to++) = *(from++); 707 } 708 else if (from < to) { 709 jshort *end = from; 710 from += count - 1; 711 to += count - 1; 712 while (from >= end) 713 *(to--) = *(from--); 714 } 715 } 716 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { 717 if (from > to) { 718 jint *end = from + count; 719 while (from < end) 720 *(to++) = *(from++); 721 } 722 else if (from < to) { 723 jint *end = from; 724 from += count - 1; 725 to += count - 1; 726 while (from >= end) 727 *(to--) = *(from--); 728 } 729 } 730 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { 731 if (from > to) { 732 jlong *end = from + count; 733 while (from < end) 734 os::atomic_copy64(from++, to++); 735 } 736 else if (from < to) { 737 jlong *end = from; 738 from += count - 1; 739 to += count - 1; 740 while (from >= end) 741 os::atomic_copy64(from--, to--); 742 } 743 } 744 745 void _Copy_arrayof_conjoint_bytes(HeapWord* from, 746 HeapWord* to, 747 size_t count) { 748 memmove(to, from, count); 749 } 750 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, 751 HeapWord* to, 752 size_t count) { 753 memmove(to, from, count * 2); 754 } 755 void _Copy_arrayof_conjoint_jints(HeapWord* from, 756 HeapWord* to, 757 size_t count) { 758 memmove(to, from, count * 4); 759 } 760 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, 761 HeapWord* to, 762 size_t count) { 763 memmove(to, from, count * 8); 764 } 765 };