1 /* 2 * Copyright (c) 1999, 2018, 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 "jvm.h" 28 #include "asm/macroAssembler.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/vtableStubs.hpp" 35 #include "code/nativeInst.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "os_share_linux.hpp" 39 #include "prims/jniFastGetField.hpp" 40 #include "prims/jvm_misc.hpp" 41 #include "runtime/arguments.hpp" 42 #include "runtime/extendedPC.hpp" 43 #include "runtime/frame.inline.hpp" 44 #include "runtime/interfaceSupport.inline.hpp" 45 #include "runtime/java.hpp" 46 #include "runtime/javaCalls.hpp" 47 #include "runtime/mutexLocker.hpp" 48 #include "runtime/osThread.hpp" 49 #include "runtime/sharedRuntime.hpp" 50 #include "runtime/stubRoutines.hpp" 51 #include "runtime/thread.inline.hpp" 52 #include "runtime/timer.hpp" 53 #include "utilities/debug.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 #define REG_LR 30 91 92 #define SPELL_REG_SP "sp" 93 #define SPELL_REG_FP "x29" 94 #endif 95 96 address os::current_stack_pointer() { 97 register void *esp __asm__ (SPELL_REG_SP); 98 return (address) esp; 99 } 100 101 char* os::non_memory_address_word() { 102 // Must never look like an address returned by reserve_memory, 103 // even in its subfields (as defined by the CPU immediate fields, 104 // if the CPU splits constants across multiple instructions). 105 106 return (char*) 0xffffffffffff; 107 } 108 109 void os::initialize_thread(Thread *thr) { 110 } 111 112 address os::Linux::ucontext_get_pc(const ucontext_t * uc) { 113 #ifdef BUILTIN_SIM 114 return (address)uc->uc_mcontext.gregs[REG_PC]; 115 #else 116 return (address)uc->uc_mcontext.pc; 117 #endif 118 } 119 120 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { 121 #ifdef BUILTIN_SIM 122 uc->uc_mcontext.gregs[REG_PC] = (intptr_t)pc; 123 #else 124 uc->uc_mcontext.pc = (intptr_t)pc; 125 #endif 126 } 127 128 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) { 129 #ifdef BUILTIN_SIM 130 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP]; 131 #else 132 return (intptr_t*)uc->uc_mcontext.sp; 133 #endif 134 } 135 136 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) { 137 #ifdef BUILTIN_SIM 138 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP]; 139 #else 140 return (intptr_t*)uc->uc_mcontext.regs[REG_FP]; 141 #endif 142 } 143 144 // For Forte Analyzer AsyncGetCallTrace profiling support - thread 145 // is currently interrupted by SIGPROF. 146 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal 147 // frames. Currently we don't do that on Linux, so it's the same as 148 // os::fetch_frame_from_context(). 149 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, 150 const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { 151 152 assert(thread != NULL, "just checking"); 153 assert(ret_sp != NULL, "just checking"); 154 assert(ret_fp != NULL, "just checking"); 155 156 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); 157 } 158 159 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 160 intptr_t** ret_sp, intptr_t** ret_fp) { 161 162 ExtendedPC epc; 163 const ucontext_t* uc = (const ucontext_t*)ucVoid; 164 165 if (uc != NULL) { 166 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 167 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); 168 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc); 169 } else { 170 // construct empty ExtendedPC for return value checking 171 epc = ExtendedPC(NULL); 172 if (ret_sp) *ret_sp = (intptr_t *)NULL; 173 if (ret_fp) *ret_fp = (intptr_t *)NULL; 174 } 175 176 return epc; 177 } 178 179 frame os::fetch_frame_from_context(const void* ucVoid) { 180 intptr_t* sp; 181 intptr_t* fp; 182 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 183 return frame(sp, fp, epc.pc()); 184 } 185 186 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 187 address pc = (address) os::Linux::ucontext_get_pc(uc); 188 if (Interpreter::contains(pc)) { 189 // interpreter performs stack banging after the fixed frame header has 190 // been generated while the compilers perform it before. To maintain 191 // semantic consistency between interpreted and compiled frames, the 192 // method returns the Java sender of the current frame. 193 *fr = os::fetch_frame_from_context(uc); 194 if (!fr->is_first_java_frame()) { 195 assert(fr->safe_for_sender(thread), "Safety check"); 196 *fr = fr->java_sender(); 197 } 198 } else { 199 // more complex code with compiled code 200 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 201 CodeBlob* cb = CodeCache::find_blob(pc); 202 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 203 // Not sure where the pc points to, fallback to default 204 // stack overflow handling 205 return false; 206 } else { 207 // In compiled code, the stack banging is performed before LR 208 // has been saved in the frame. LR is live, and SP and FP 209 // belong to the caller. 210 intptr_t* fp = os::Linux::ucontext_get_fp(uc); 211 intptr_t* sp = os::Linux::ucontext_get_sp(uc); 212 address pc = (address)(uc->uc_mcontext.regs[REG_LR] 213 - NativeInstruction::instruction_size); 214 *fr = frame(sp, fp, pc); 215 if (!fr->is_java_frame()) { 216 assert(fr->safe_for_sender(thread), "Safety check"); 217 assert(!fr->is_first_frame(), "Safety check"); 218 *fr = fr->java_sender(); 219 } 220 } 221 } 222 assert(fr->is_java_frame(), "Safety check"); 223 return true; 224 } 225 226 // By default, gcc always saves frame pointer rfp on this stack. This 227 // may get turned off by -fomit-frame-pointer. 228 frame os::get_sender_for_C_frame(frame* fr) { 229 #ifdef BUILTIN_SIM 230 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); 231 #else 232 return frame(fr->link(), fr->link(), fr->sender_pc()); 233 #endif 234 } 235 236 intptr_t* _get_previous_fp() { 237 register intptr_t **fp __asm__ (SPELL_REG_FP); 238 239 // fp is for this frame (_get_previous_fp). We want the fp for the 240 // caller of os::current_frame*(), so go up two frames. However, for 241 // optimized builds, _get_previous_fp() will be inlined, so only go 242 // up 1 frame in that case. 243 #ifdef _NMT_NOINLINE_ 244 return **(intptr_t***)fp; 245 #else 246 return *fp; 247 #endif 248 } 249 250 251 frame os::current_frame() { 252 intptr_t* fp = _get_previous_fp(); 253 frame myframe((intptr_t*)os::current_stack_pointer(), 254 (intptr_t*)fp, 255 CAST_FROM_FN_PTR(address, os::current_frame)); 256 if (os::is_first_C_frame(&myframe)) { 257 // stack is not walkable 258 return frame(); 259 } else { 260 return os::get_sender_for_C_frame(&myframe); 261 } 262 } 263 264 // Utility functions 265 266 // From IA32 System Programming Guide 267 enum { 268 trap_page_fault = 0xE 269 }; 270 271 #ifdef BUILTIN_SIM 272 extern "C" void Fetch32PFI () ; 273 extern "C" void Fetch32Resume () ; 274 extern "C" void FetchNPFI () ; 275 extern "C" void FetchNResume () ; 276 #endif 277 278 extern "C" JNIEXPORT int 279 JVM_handle_linux_signal(int sig, 280 siginfo_t* info, 281 void* ucVoid, 282 int abort_if_unrecognized) { 283 ucontext_t* uc = (ucontext_t*) ucVoid; 284 285 Thread* t = Thread::current_or_null_safe(); 286 287 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 288 // (no destructors can be run) 289 os::ThreadCrashProtection::check_crash_protection(sig, t); 290 291 SignalHandlerMark shm(t); 292 293 // Note: it's not uncommon that JNI code uses signal/sigset to install 294 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 295 // or have a SIGILL handler when detecting CPU type). When that happens, 296 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 297 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 298 // that do not require siginfo/ucontext first. 299 300 if (sig == SIGPIPE || sig == SIGXFSZ) { 301 // allow chained handler to go first 302 if (os::Linux::chained_handler(sig, info, ucVoid)) { 303 return true; 304 } else { 305 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 306 return true; 307 } 308 } 309 310 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT 311 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { 312 handle_assert_poison_fault(ucVoid, info->si_addr); 313 return 1; 314 } 315 #endif 316 317 JavaThread* thread = NULL; 318 VMThread* vmthread = NULL; 319 if (os::Linux::signal_handlers_are_installed) { 320 if (t != NULL ){ 321 if(t->is_Java_thread()) { 322 thread = (JavaThread*)t; 323 } 324 else if(t->is_VM_thread()){ 325 vmthread = (VMThread *)t; 326 } 327 } 328 } 329 /* 330 NOTE: does not seem to work on linux. 331 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { 332 // can't decode this kind of signal 333 info = NULL; 334 } else { 335 assert(sig == info->si_signo, "bad siginfo"); 336 } 337 */ 338 // decide if this trap can be handled by a stub 339 address stub = NULL; 340 341 address pc = NULL; 342 343 //%note os_trap_1 344 if (info != NULL && uc != NULL && thread != NULL) { 345 pc = (address) os::Linux::ucontext_get_pc(uc); 346 347 #ifdef BUILTIN_SIM 348 if (pc == (address) Fetch32PFI) { 349 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ; 350 return 1 ; 351 } 352 if (pc == (address) FetchNPFI) { 353 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ; 354 return 1 ; 355 } 356 #else 357 if (StubRoutines::is_safefetch_fault(pc)) { 358 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 359 return 1; 360 } 361 #endif 362 363 // Handle ALL stack overflow variations here 364 if (sig == SIGSEGV) { 365 address addr = (address) info->si_addr; 366 367 // check if fault address is within thread stack 368 if (thread->on_local_stack(addr)) { 369 // stack overflow 370 if (thread->in_stack_yellow_reserved_zone(addr)) { 371 thread->disable_stack_yellow_reserved_zone(); 372 if (thread->thread_state() == _thread_in_Java) { 373 if (thread->in_stack_reserved_zone(addr)) { 374 frame fr; 375 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { 376 assert(fr.is_java_frame(), "Must be a Java frame"); 377 frame activation = 378 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 379 if (activation.sp() != NULL) { 380 thread->disable_stack_reserved_zone(); 381 if (activation.is_interpreted_frame()) { 382 thread->set_reserved_stack_activation((address)( 383 activation.fp() + frame::interpreter_frame_initial_sp_offset)); 384 } else { 385 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 386 } 387 return 1; 388 } 389 } 390 } 391 // Throw a stack overflow exception. Guard pages will be reenabled 392 // while unwinding the stack. 393 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 394 } else { 395 // Thread was in the vm or native code. Return and try to finish. 396 return 1; 397 } 398 } else if (thread->in_stack_red_zone(addr)) { 399 // Fatal red zone violation. Disable the guard pages and fall through 400 // to handle_unexpected_exception way down below. 401 thread->disable_stack_red_zone(); 402 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 403 404 // This is a likely cause, but hard to verify. Let's just print 405 // it as a hint. 406 tty->print_raw_cr("Please check if any of your loaded .so files has " 407 "enabled executable stack (see man page execstack(8))"); 408 } else { 409 // Accessing stack address below sp may cause SEGV if current 410 // thread has MAP_GROWSDOWN stack. This should only happen when 411 // current thread was created by user code with MAP_GROWSDOWN flag 412 // and then attached to VM. See notes in os_linux.cpp. 413 if (thread->osthread()->expanding_stack() == 0) { 414 thread->osthread()->set_expanding_stack(); 415 if (os::Linux::manually_expand_stack(thread, addr)) { 416 thread->osthread()->clear_expanding_stack(); 417 return 1; 418 } 419 thread->osthread()->clear_expanding_stack(); 420 } else { 421 fatal("recursive segv. expanding stack."); 422 } 423 } 424 } 425 } 426 427 if (thread->thread_state() == _thread_in_Java) { 428 // Java thread running in Java code => find exception handler if any 429 // a fault inside compiled code, the interpreter, or a stub 430 431 // Handle signal from NativeJump::patch_verified_entry(). 432 if ((sig == SIGILL || sig == SIGTRAP) 433 && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { 434 if (TraceTraps) { 435 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); 436 } 437 stub = SharedRuntime::get_handle_wrong_method_stub(); 438 } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { 439 stub = SharedRuntime::get_poll_stub(pc); 440 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { 441 // BugId 4454115: A read from a MappedByteBuffer can fault 442 // here if the underlying file has been truncated. 443 // Do not crash the VM in such a case. 444 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 445 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 446 if (nm != NULL && nm->has_unsafe_access()) { 447 address next_pc = pc + NativeCall::instruction_size; 448 stub = SharedRuntime::handle_unsafe_access(thread, next_pc); 449 } 450 } 451 else 452 453 if (sig == SIGFPE && 454 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { 455 stub = 456 SharedRuntime:: 457 continuation_for_implicit_exception(thread, 458 pc, 459 SharedRuntime:: 460 IMPLICIT_DIVIDE_BY_ZERO); 461 } else if (sig == SIGSEGV && 462 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { 463 // Determination of interpreter/vtable stub/compiled code null exception 464 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 465 } 466 } else if (thread->thread_state() == _thread_in_vm && 467 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ 468 thread->doing_unsafe_access()) { 469 address next_pc = pc + NativeCall::instruction_size; 470 stub = SharedRuntime::handle_unsafe_access(thread, next_pc); 471 } 472 473 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in 474 // and the heap gets shrunk before the field access. 475 if ((sig == SIGSEGV) || (sig == SIGBUS)) { 476 address addr = JNI_FastGetField::find_slowcase_pc(pc); 477 if (addr != (address)-1) { 478 stub = addr; 479 } 480 } 481 482 // Check to see if we caught the safepoint code in the 483 // process of write protecting the memory serialization page. 484 // It write enables the page immediately after protecting it 485 // so we can just return to retry the write. 486 if ((sig == SIGSEGV) && 487 os::is_memory_serialize_page(thread, (address) info->si_addr)) { 488 // Block current thread until the memory serialize page permission restored. 489 os::block_on_serialize_page_trap(); 490 return true; 491 } 492 } 493 494 if (stub != NULL) { 495 // save all thread context in case we need to restore it 496 if (thread != NULL) thread->set_saved_exception_pc(pc); 497 498 os::Linux::ucontext_set_pc(uc, stub); 499 return true; 500 } 501 502 // signal-chaining 503 if (os::Linux::chained_handler(sig, info, ucVoid)) { 504 return true; 505 } 506 507 if (!abort_if_unrecognized) { 508 // caller wants another chance, so give it to him 509 return false; 510 } 511 512 if (pc == NULL && uc != NULL) { 513 pc = os::Linux::ucontext_get_pc(uc); 514 } 515 516 // unmask current signal 517 sigset_t newset; 518 sigemptyset(&newset); 519 sigaddset(&newset, sig); 520 sigprocmask(SIG_UNBLOCK, &newset, NULL); 521 522 VMError::report_and_die(t, sig, pc, info, ucVoid); 523 524 ShouldNotReachHere(); 525 return true; // Mute compiler 526 } 527 528 void os::Linux::init_thread_fpu_state(void) { 529 } 530 531 int os::Linux::get_fpu_control_word(void) { 532 return 0; 533 } 534 535 void os::Linux::set_fpu_control_word(int fpu_control) { 536 } 537 538 // Check that the linux kernel version is 2.4 or higher since earlier 539 // versions do not support SSE without patches. 540 bool os::supports_sse() { 541 return true; 542 } 543 544 bool os::is_allocatable(size_t bytes) { 545 return true; 546 } 547 548 //////////////////////////////////////////////////////////////////////////////// 549 // thread stack 550 551 // Minimum usable stack sizes required to get to user code. Space for 552 // HotSpot guard pages is added later. 553 size_t os::Posix::_compiler_thread_min_stack_allowed = 72 * K; 554 size_t os::Posix::_java_thread_min_stack_allowed = 72 * K; 555 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 72 * K; 556 557 // return default stack size for thr_type 558 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 559 // default stack size (compiler thread needs larger stack) 560 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); 561 return s; 562 } 563 564 ///////////////////////////////////////////////////////////////////////////// 565 // helper functions for fatal error handler 566 567 void os::print_context(outputStream *st, const void *context) { 568 if (context == NULL) return; 569 570 const ucontext_t *uc = (const ucontext_t*)context; 571 st->print_cr("Registers:"); 572 #ifdef BUILTIN_SIM 573 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]); 574 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]); 575 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]); 576 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]); 577 st->cr(); 578 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]); 579 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]); 580 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]); 581 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]); 582 st->cr(); 583 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]); 584 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]); 585 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]); 586 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]); 587 st->cr(); 588 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]); 589 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]); 590 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]); 591 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]); 592 st->cr(); 593 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]); 594 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]); 595 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]); 596 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]); 597 st->cr(); 598 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]); 599 st->cr(); 600 #else 601 for (int r = 0; r < 31; r++) { 602 st->print("R%-2d=", r); 603 print_location(st, uc->uc_mcontext.regs[r]); 604 } 605 #endif 606 st->cr(); 607 608 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 609 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 610 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); 611 st->cr(); 612 613 // Note: it may be unsafe to inspect memory near pc. For example, pc may 614 // point to garbage if entry point in an nmethod is corrupted. Leave 615 // this at the end, and hope for the best. 616 address pc = os::Linux::ucontext_get_pc(uc); 617 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 618 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); 619 } 620 621 void os::print_register_info(outputStream *st, const void *context) { 622 if (context == NULL) return; 623 624 const ucontext_t *uc = (const ucontext_t*)context; 625 626 st->print_cr("Register to memory mapping:"); 627 st->cr(); 628 629 // this is horrendously verbose but the layout of the registers in the 630 // context does not match how we defined our abstract Register set, so 631 // we can't just iterate through the gregs area 632 633 // this is only for the "general purpose" registers 634 635 #ifdef BUILTIN_SIM 636 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]); 637 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]); 638 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]); 639 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]); 640 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]); 641 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]); 642 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]); 643 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]); 644 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]); 645 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]); 646 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]); 647 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]); 648 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]); 649 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]); 650 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]); 651 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]); 652 #else 653 for (int r = 0; r < 31; r++) 654 st->print_cr( "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]); 655 #endif 656 st->cr(); 657 } 658 659 void os::setup_fpu() { 660 } 661 662 #ifndef PRODUCT 663 void os::verify_stack_alignment() { 664 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment"); 665 } 666 #endif 667 668 int os::extra_bang_size_in_bytes() { 669 // AArch64 does not require the additional stack bang. 670 return 0; 671 } 672 673 extern "C" { 674 int SpinPause() { 675 return 0; 676 } 677 678 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { 679 if (from > to) { 680 jshort *end = from + count; 681 while (from < end) 682 *(to++) = *(from++); 683 } 684 else if (from < to) { 685 jshort *end = from; 686 from += count - 1; 687 to += count - 1; 688 while (from >= end) 689 *(to--) = *(from--); 690 } 691 } 692 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { 693 if (from > to) { 694 jint *end = from + count; 695 while (from < end) 696 *(to++) = *(from++); 697 } 698 else if (from < to) { 699 jint *end = from; 700 from += count - 1; 701 to += count - 1; 702 while (from >= end) 703 *(to--) = *(from--); 704 } 705 } 706 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { 707 if (from > to) { 708 jlong *end = from + count; 709 while (from < end) 710 os::atomic_copy64(from++, to++); 711 } 712 else if (from < to) { 713 jlong *end = from; 714 from += count - 1; 715 to += count - 1; 716 while (from >= end) 717 os::atomic_copy64(from--, to--); 718 } 719 } 720 721 void _Copy_arrayof_conjoint_bytes(HeapWord* from, 722 HeapWord* to, 723 size_t count) { 724 memmove(to, from, count); 725 } 726 void _Copy_arrayof_conjoint_jshorts(HeapWord* from, 727 HeapWord* to, 728 size_t count) { 729 memmove(to, from, count * 2); 730 } 731 void _Copy_arrayof_conjoint_jints(HeapWord* from, 732 HeapWord* to, 733 size_t count) { 734 memmove(to, from, count * 4); 735 } 736 void _Copy_arrayof_conjoint_jlongs(HeapWord* from, 737 HeapWord* to, 738 size_t count) { 739 memmove(to, from, count * 8); 740 } 741 };