1 /* 2 * Copyright (c) 1999, 2016, 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/codeCache.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "code/nativeInst.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "jvm_linux.h" 37 #include "memory/allocation.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(const 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(const 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(const 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 const 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(const void* ucVoid, 159 intptr_t** ret_sp, intptr_t** ret_fp) { 160 161 ExtendedPC epc; 162 const ucontext_t* uc = (const 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(const 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 extern "C" JNIEXPORT int 229 JVM_handle_linux_signal(int sig, 230 siginfo_t* info, 231 void* ucVoid, 232 int abort_if_unrecognized) { 233 ucontext_t* uc = (ucontext_t*) ucVoid; 234 235 Thread* t = Thread::current_or_null_safe(); 236 237 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 238 // (no destructors can be run) 239 os::WatcherThreadCrashProtection::check_crash_protection(sig, t); 240 241 SignalHandlerMark shm(t); 242 243 // Note: it's not uncommon that JNI code uses signal/sigset to install 244 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 245 // or have a SIGILL handler when detecting CPU type). When that happens, 246 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 247 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 248 // that do not require siginfo/ucontext first. 249 250 if (sig == SIGPIPE || sig == SIGXFSZ) { 251 // allow chained handler to go first 252 if (os::Linux::chained_handler(sig, info, ucVoid)) { 253 return true; 254 } else { 255 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 256 return true; 257 } 258 } 259 260 JavaThread* thread = NULL; 261 VMThread* vmthread = NULL; 262 if (os::Linux::signal_handlers_are_installed) { 263 if (t != NULL ){ 264 if(t->is_Java_thread()) { 265 thread = (JavaThread*)t; 266 } 267 else if(t->is_VM_thread()){ 268 vmthread = (VMThread *)t; 269 } 270 } 271 } 272 /* 273 NOTE: does not seem to work on linux. 274 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 275 // can't decode this kind of signal 276 info = NULL; 277 } else { 278 assert(sig == info->si_signo, "bad siginfo"); 279 } 280 */ 281 // decide if this trap can be handled by a stub 282 address stub = NULL; 283 284 address pc = NULL; 285 286 //%note os_trap_1 287 if (info != NULL && uc != NULL && thread != NULL) { 288 pc = (address) os::Linux::ucontext_get_pc(uc); 289 290 #ifdef BUILTIN_SIM 291 if (pc == (address) Fetch32PFI) { 292 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; 293 return 1 ; 294 } 295 if (pc == (address) FetchNPFI) { 296 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ; 297 return 1 ; 298 } 299 #else 300 if (StubRoutines::is_safefetch_fault(pc)) { 301 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 302 return 1; 303 } 304 #endif 305 306 // Handle ALL stack overflow variations here 307 if (sig == SIGSEGV) { 308 address addr = (address) info->si_addr; 309 310 // check if fault address is within thread stack 311 if (thread->on_local_stack(addr)) { 312 // stack overflow 313 if (thread->in_stack_yellow_reserved_zone(addr)) { 314 thread->disable_stack_yellow_reserved_zone(); 315 if (thread->thread_state() == _thread_in_Java) { 316 // Throw a stack overflow exception. Guard pages will be reenabled 317 // while unwinding the stack. 318 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 319 } else { 320 // Thread was in the vm or native code. Return and try to finish. 321 return 1; 322 } 323 } else if (thread->in_stack_red_zone(addr)) { 324 // Fatal red zone violation. Disable the guard pages and fall through 325 // to handle_unexpected_exception way down below. 326 thread->disable_stack_red_zone(); 327 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 328 329 // This is a likely cause, but hard to verify. Let's just print 330 // it as a hint. 331 tty->print_raw_cr("Please check if any of your loaded .so files has " 332 "enabled executable stack (see man page execstack(8))"); 333 } else { 334 // Accessing stack address below sp may cause SEGV if current 335 // thread has MAP_GROWSDOWN stack. This should only happen when 336 // current thread was created by user code with MAP_GROWSDOWN flag 337 // and then attached to VM. See notes in os_linux.cpp. 338 if (thread->osthread()->expanding_stack() == 0) { 339 thread->osthread()->set_expanding_stack(); 340 if (os::Linux::manually_expand_stack(thread, addr)) { 341 thread->osthread()->clear_expanding_stack(); 342 return 1; 343 } 344 thread->osthread()->clear_expanding_stack(); 345 } else { 346 fatal("recursive segv. expanding stack."); 347 } 348 } 349 } 350 } 351 352 if (thread->thread_state() == _thread_in_Java) { 353 // Java thread running in Java code => find exception handler if any 354 // a fault inside compiled code, the interpreter, or a stub 355 356 // Handle signal from NativeJump::patch_verified_entry(). 357 if ((sig == SIGILL || sig == SIGTRAP) 358 && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { 359 if (TraceTraps) { 360 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 361 } 362 stub = SharedRuntime::get_handle_wrong_method_stub(); 363 } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 364 stub = SharedRuntime::get_poll_stub(pc); 365 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { 366 // BugId 4454115: A read from a MappedByteBuffer can fault 367 // here if the underlying file has been truncated. 368 // Do not crash the VM in such a case. 369 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 370 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 371 if (nm != NULL && nm->has_unsafe_access()) { 372 address next_pc = pc + NativeCall::instruction_size; 373 stub = SharedRuntime::handle_unsafe_access(thread, next_pc); 374 } 375 } 376 else 377 378 if (sig == SIGFPE && 379 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { 380 stub = 381 SharedRuntime:: 382 continuation_for_implicit_exception(thread, 383 pc, 384 SharedRuntime:: 385 IMPLICIT_DIVIDE_BY_ZERO); 386 } else if (sig == SIGSEGV && 387 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { 388 // Determination of interpreter/vtable stub/compiled code null exception 389 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 390 } 391 } else if (thread->thread_state() == _thread_in_vm && 392 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ 393 thread->doing_unsafe_access()) { 394 address next_pc = pc + NativeCall::instruction_size; 395 stub = SharedRuntime::handle_unsafe_access(thread, next_pc); 396 } 397 398 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 399 // and the heap gets shrunk before the field access. 400 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 401 address addr = JNI_FastGetField::find_slowcase_pc(pc); 402 if (addr != (address)-1) { 403 stub = addr; 404 } 405 } 406 407 // Check to see if we caught the safepoint code in the 408 // process of write protecting the memory serialization page. 409 // It write enables the page immediately after protecting it 410 // so we can just return to retry the write. 411 if ((sig == SIGSEGV) && 412 os::is_memory_serialize_page(thread, (address) info->si_addr)) { 413 // Block current thread until the memory serialize page permission restored. 414 os::block_on_serialize_page_trap(); 415 return true; 416 } 417 } 418 419 if (stub != NULL) { 420 // save all thread context in case we need to restore it 421 if (thread != NULL) thread->set_saved_exception_pc(pc); 422 423 os::Linux::ucontext_set_pc(uc, stub); 424 return true; 425 } 426 427 // signal-chaining 428 if (os::Linux::chained_handler(sig, info, ucVoid)) { 429 return true; 430 } 431 432 if (!abort_if_unrecognized) { 433 // caller wants another chance, so give it to him 434 return false; 435 } 436 437 if (pc == NULL && uc != NULL) { 438 pc = os::Linux::ucontext_get_pc(uc); 439 } 440 441 // unmask current signal 442 sigset_t newset; 443 sigemptyset(&newset); 444 sigaddset(&newset, sig); 445 sigprocmask(SIG_UNBLOCK, &newset, NULL); 446 447 VMError::report_and_die(t, sig, pc, info, ucVoid); 448 449 ShouldNotReachHere(); 450 return true; // Mute compiler 451 } 452 453 void os::Linux::init_thread_fpu_state(void) { 454 } 455 456 int os::Linux::get_fpu_control_word(void) { 457 return 0; 458 } 459 460 void os::Linux::set_fpu_control_word(int fpu_control) { 461 } 462 463 // Check that the linux kernel version is 2.4 or higher since earlier 464 // versions do not support SSE without patches. 465 bool os::supports_sse() { 466 return true; 467 } 468 469 bool os::is_allocatable(size_t bytes) { 470 return true; 471 } 472 473 //////////////////////////////////////////////////////////////////////////////// 474 // thread stack 475 476 size_t os::Posix::_compiler_thread_min_stack_allowed = 64 * K; 477 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K; 478 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K; 479 480 // return default stack size for thr_type 481 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 482 // default stack size (compiler thread needs larger stack) 483 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 484 return s; 485 } 486 487 size_t os::Linux::default_guard_size(os::ThreadType thr_type) { 488 // Creating guard page is very expensive. Java thread has HotSpot 489 // guard page, only enable glibc guard page for non-Java threads. 490 return (thr_type == java_thread ? 0 : page_size()); 491 } 492 493 // Java thread: 494 // 495 // Low memory addresses 496 // +------------------------+ 497 // | |\ JavaThread created by VM does not have glibc 498 // | glibc guard page | - guard, attached Java thread usually has 499 // | |/ 1 page glibc guard. 500 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() 501 // | |\ 502 // | HotSpot Guard Pages | - red and yellow pages 503 // | |/ 504 // +------------------------+ JavaThread::stack_yellow_zone_base() 505 // | |\ 506 // | Normal Stack | - 507 // | |/ 508 // P2 +------------------------+ Thread::stack_base() 509 // 510 // Non-Java thread: 511 // 512 // Low memory addresses 513 // +------------------------+ 514 // | |\ 515 // | glibc guard page | - usually 1 page 516 // | |/ 517 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() 518 // | |\ 519 // | Normal Stack | - 520 // | |/ 521 // P2 +------------------------+ Thread::stack_base() 522 // 523 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from 524 // pthread_attr_getstack() 525 526 static void current_stack_region(address * bottom, size_t * size) { 527 if (os::Linux::is_initial_thread()) { 528 // initial thread needs special handling because pthread_getattr_np() 529 // may return bogus value. 530 *bottom = os::Linux::initial_thread_stack_bottom(); 531 *size = os::Linux::initial_thread_stack_size(); 532 } else { 533 pthread_attr_t attr; 534 535 int rslt = pthread_getattr_np(pthread_self(), &attr); 536 537 // JVM needs to know exact stack location, abort if it fails 538 if (rslt != 0) { 539 if (rslt == ENOMEM) { 540 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); 541 } else { 542 fatal("pthread_getattr_np failed with errno = %d", rslt); 543 } 544 } 545 546 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { 547 fatal("Can not locate current stack attributes!"); 548 } 549 550 pthread_attr_destroy(&attr); 551 552 } 553 assert(os::current_stack_pointer() >= *bottom && 554 os::current_stack_pointer() < *bottom + *size, "just checking"); 555 } 556 557 address os::current_stack_base() { 558 address bottom; 559 size_t size; 560 current_stack_region(&bottom, &size); 561 return (bottom + size); 562 } 563 564 size_t os::current_stack_size() { 565 // stack size includes normal stack and HotSpot guard pages 566 address bottom; 567 size_t size; 568 current_stack_region(&bottom, &size); 569 return size; 570 } 571 572 ///////////////////////////////////////////////////////////////////////////// 573 // helper functions for fatal error handler 574 575 void os::print_context(outputStream *st, const void *context) { 576 if (context == NULL) return; 577 578 const ucontext_t *uc = (const ucontext_t*)context; 579 st->print_cr("Registers:"); 580 #ifdef BUILTIN_SIM 581 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 582 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 583 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 584 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 585 st->cr(); 586 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 587 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 588 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 589 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 590 st->cr(); 591 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 592 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 593 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 594 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 595 st->cr(); 596 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 597 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 598 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 599 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 600 st->cr(); 601 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 602 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); 603 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]); 604 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]); 605 st->cr(); 606 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]); 607 st->cr(); 608 #else 609 for (int r = 0; r < 31; r++) 610 st->print_cr( "R%d=" INTPTR_FORMAT, r, (size_t)uc->uc_mcontext.regs[r]); 611 #endif 612 st->cr(); 613 614 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 615 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 616 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 617 st->cr(); 618 619 // Note: it may be unsafe to inspect memory near pc. For example, pc may 620 // point to garbage if entry point in an nmethod is corrupted. Leave 621 // this at the end, and hope for the best. 622 address pc = os::Linux::ucontext_get_pc(uc); 623 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 624 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 625 } 626 627 void os::print_register_info(outputStream *st, const void *context) { 628 if (context == NULL) return; 629 630 const ucontext_t *uc = (const ucontext_t*)context; 631 632 st->print_cr("Register to memory mapping:"); 633 st->cr(); 634 635 // this is horrendously verbose but the layout of the registers in the 636 // context does not match how we defined our abstract Register set, so 637 // we can't just iterate through the gregs area 638 639 // this is only for the "general purpose" registers 640 641 #ifdef BUILTIN_SIM 642 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 643 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 644 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 645 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 646 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 647 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 648 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 649 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 650 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 651 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 652 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 653 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 654 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 655 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 656 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 657 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 658 #else 659 for (int r = 0; r < 31; r++) 660 st->print_cr( "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]); 661 #endif 662 st->cr(); 663 } 664 665 void os::setup_fpu() { 666 } 667 668 #ifndef PRODUCT 669 void os::verify_stack_alignment() { 670 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 671 } 672 #endif 673 674 int os::extra_bang_size_in_bytes() { 675 // AArch64 does not require the additional stack bang. 676 return 0; 677 } 678 679 extern "C" { 680 int SpinPause() { 681 return 0; 682 } 683 684 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { 685 if (from > to) { 686 jshort *end = from + count; 687 while (from < end) 688 *(to++) = *(from++); 689 } 690 else if (from < to) { 691 jshort *end = from; 692 from += count - 1; 693 to += count - 1; 694 while (from >= end) 695 *(to--) = *(from--); 696 } 697 } 698 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { 699 if (from > to) { 700 jint *end = from + count; 701 while (from < end) 702 *(to++) = *(from++); 703 } 704 else if (from < to) { 705 jint *end = from; 706 from += count - 1; 707 to += count - 1; 708 while (from >= end) 709 *(to--) = *(from--); 710 } 711 } 712 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { 713 if (from > to) { 714 jlong *end = from + count; 715 while (from < end) 716 os::atomic_copy64(from++, to++); 717 } 718 else if (from < to) { 719 jlong *end = from; 720 from += count - 1; 721 to += count - 1; 722 while (from >= end) 723 os::atomic_copy64(from--, to--); 724 } 725 } 726 727 void _Copy_arrayof_conjoint_bytes(HeapWord* from, 728 HeapWord* to, 729 size_t count) { 730 memmove(to, from, count); 731 } 732 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, 733 HeapWord* to, 734 size_t count) { 735 memmove(to, from, count * 2); 736 } 737 void _Copy_arrayof_conjoint_jints(HeapWord* from, 738 HeapWord* to, 739 size_t count) { 740 memmove(to, from, count * 4); 741 } 742 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, 743 HeapWord* to, 744 size_t count) { 745 memmove(to, from, count * 8); 746 } 747 };