1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016, 2018 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 // This file is organized as os_linux_x86.cpp. 27 28 // no precompiled headers 29 #include "jvm.h" 30 #include "asm/assembler.inline.hpp" 31 #include "classfile/classLoader.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "code/icBuffer.hpp" 35 #include "code/nativeInst.hpp" 36 #include "code/vtableStubs.hpp" 37 #include "compiler/disassembler.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "nativeInst_s390.hpp" 41 #include "os_share_linux.hpp" 42 #include "prims/jniFastGetField.hpp" 43 #include "prims/jvm_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/extendedPC.hpp" 46 #include "runtime/frame.inline.hpp" 47 #include "runtime/interfaceSupport.inline.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/mutexLocker.hpp" 51 #include "runtime/osThread.hpp" 52 #include "runtime/sharedRuntime.hpp" 53 #include "runtime/stubRoutines.hpp" 54 #include "runtime/thread.inline.hpp" 55 #include "runtime/timer.hpp" 56 #include "utilities/events.hpp" 57 #include "utilities/debug.hpp" 58 #include "utilities/vmError.hpp" 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 81 address os::current_stack_pointer() { 82 intptr_t* csp; 83 84 // Inline assembly for `z_lgr regno(csp), Z_SP' (Z_SP = Z_R15): 85 __asm__ __volatile__ ("lgr %0, 15":"=r"(csp):); 86 87 assert(((uint64_t)csp & (frame::alignment_in_bytes-1)) == 0, "SP must be aligned"); 88 return (address) csp; 89 } 90 91 char* os::non_memory_address_word() { 92 // Must never look like an address returned by reserve_memory, 93 // even in its subfields (as defined by the CPU immediate fields, 94 // if the CPU splits constants across multiple instructions). 95 return (char*) -1; 96 } 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_s390.hpp. 101 address os::Linux::ucontext_get_pc(const ucontext_t * uc) { 102 return (address)uc->uc_mcontext.psw.addr; 103 } 104 105 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { 106 uc->uc_mcontext.psw.addr = (unsigned long)pc; 107 } 108 109 static address ucontext_get_lr(const ucontext_t * uc) { 110 return (address)uc->uc_mcontext.gregs[14/*LINK*/]; 111 } 112 113 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) { 114 return (intptr_t*)uc->uc_mcontext.gregs[15/*REG_SP*/]; 115 } 116 117 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) { 118 return NULL; 119 } 120 121 ExtendedPC os::fetch_frame_from_context(const void* ucVoid, 122 intptr_t** ret_sp, intptr_t** ret_fp) { 123 124 ExtendedPC epc; 125 const ucontext_t* uc = (const ucontext_t*)ucVoid; 126 127 if (uc != NULL) { 128 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); 129 if (ret_sp) { *ret_sp = os::Linux::ucontext_get_sp(uc); } 130 if (ret_fp) { *ret_fp = os::Linux::ucontext_get_fp(uc); } 131 } else { 132 // Construct empty ExtendedPC for return value checking. 133 epc = ExtendedPC(NULL); 134 if (ret_sp) { *ret_sp = (intptr_t *)NULL; } 135 if (ret_fp) { *ret_fp = (intptr_t *)NULL; } 136 } 137 138 return epc; 139 } 140 141 frame os::fetch_frame_from_context(const void* ucVoid) { 142 intptr_t* sp; 143 intptr_t* fp; 144 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); 145 return frame(sp, epc.pc()); 146 } 147 148 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { 149 address pc = (address) os::Linux::ucontext_get_pc(uc); 150 if (Interpreter::contains(pc)) { 151 // Interpreter performs stack banging after the fixed frame header has 152 // been generated while the compilers perform it before. To maintain 153 // semantic consistency between interpreted and compiled frames, the 154 // method returns the Java sender of the current frame. 155 *fr = os::fetch_frame_from_context(uc); 156 if (!fr->is_first_java_frame()) { 157 assert(fr->safe_for_sender(thread), "Safety check"); 158 *fr = fr->java_sender(); 159 } 160 } else { 161 // More complex code with compiled code. 162 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 163 CodeBlob* cb = CodeCache::find_blob(pc); 164 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 165 // Not sure where the pc points to, fallback to default 166 // stack overflow handling. In compiled code, we bang before 167 // the frame is complete. 168 return false; 169 } else { 170 intptr_t* sp = os::Linux::ucontext_get_sp(uc); 171 address lr = ucontext_get_lr(uc); 172 *fr = frame(sp, lr); 173 if (!fr->is_java_frame()) { 174 assert(fr->safe_for_sender(thread), "Safety check"); 175 assert(!fr->is_first_frame(), "Safety check"); 176 *fr = fr->java_sender(); 177 } 178 } 179 } 180 assert(fr->is_java_frame(), "Safety check"); 181 return true; 182 } 183 184 frame os::get_sender_for_C_frame(frame* fr) { 185 if (*fr->sp() == 0) { 186 // fr is the last C frame. 187 return frame(); 188 } 189 190 // If its not one of our frames, the return pc is saved at gpr14 191 // stack slot. The call_stub stores the return_pc to the stack slot 192 // of gpr10. 193 if ((Interpreter::code() != NULL && Interpreter::contains(fr->pc())) || 194 (CodeCache::contains(fr->pc()) && !StubRoutines::contains(fr->pc()))) { 195 return frame(fr->sender_sp(), fr->sender_pc()); 196 } else { 197 if (StubRoutines::contains(fr->pc())) { 198 StubCodeDesc* desc = StubCodeDesc::desc_for(fr->pc()); 199 if (desc && !strcmp(desc->name(),"call_stub")) { 200 return frame(fr->sender_sp(), fr->callstub_sender_pc()); 201 } else { 202 return frame(fr->sender_sp(), fr->sender_pc()); 203 } 204 } else { 205 return frame(fr->sender_sp(), fr->native_sender_pc()); 206 } 207 } 208 } 209 210 frame os::current_frame() { 211 // Expected to return the stack pointer of this method. 212 // But if inlined, returns the stack pointer of our caller! 213 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer()); 214 assert (csp != NULL, "sp should not be NULL"); 215 // Pass a dummy pc. This way we don't have to load it from the 216 // stack, since we don't know in which slot we can find it. 217 frame topframe(csp, (address)0x8); 218 if (os::is_first_C_frame(&topframe)) { 219 // Stack is not walkable. 220 return frame(); 221 } else { 222 frame senderFrame = os::get_sender_for_C_frame(&topframe); 223 assert(senderFrame.pc() != NULL, "Sender pc should not be NULL"); 224 // Return sender of sender of current topframe which hopefully 225 // both have pc != NULL. 226 #ifdef _NMT_NOINLINE_ // Is set in slowdebug builds. 227 // Current_stack_pointer is not inlined, we must pop one more frame. 228 frame tmp = os::get_sender_for_C_frame(&topframe); 229 return os::get_sender_for_C_frame(&tmp); 230 #else 231 return os::get_sender_for_C_frame(&topframe); 232 #endif 233 } 234 } 235 236 // Utility functions 237 238 extern "C" JNIEXPORT int 239 JVM_handle_linux_signal(int sig, 240 siginfo_t* info, 241 void* ucVoid, 242 int abort_if_unrecognized) { 243 ucontext_t* uc = (ucontext_t*) ucVoid; 244 245 Thread* t = Thread::current_or_null_safe(); 246 247 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away 248 // (no destructors can be run). 249 os::ThreadCrashProtection::check_crash_protection(sig, t); 250 251 SignalHandlerMark shm(t); 252 253 // Note: it's not uncommon that JNI code uses signal/sigset to install 254 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, 255 // or have a SIGILL handler when detecting CPU type). When that happens, 256 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To 257 // avoid unnecessary crash when libjsig is not preloaded, try handle signals 258 // that do not require siginfo/ucontext first. 259 260 if (sig == SIGPIPE) { 261 if (os::Linux::chained_handler(sig, info, ucVoid)) { 262 return true; 263 } else { 264 if (PrintMiscellaneous && (WizardMode || Verbose)) { 265 warning("Ignoring SIGPIPE - see bug 4229104"); 266 } 267 return true; 268 } 269 } 270 271 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT 272 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { 273 handle_assert_poison_fault(ucVoid, info->si_addr); 274 return 1; 275 } 276 #endif 277 278 JavaThread* thread = NULL; 279 VMThread* vmthread = NULL; 280 if (os::Linux::signal_handlers_are_installed) { 281 if (t != NULL) { 282 if(t->is_Java_thread()) { 283 thread = (JavaThread*)t; 284 } else if(t->is_VM_thread()) { 285 vmthread = (VMThread *)t; 286 } 287 } 288 } 289 290 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make 291 // it work if no associated JavaThread object exists. 292 if (uc) { 293 address const pc = os::Linux::ucontext_get_pc(uc); 294 if (pc && StubRoutines::is_safefetch_fault(pc)) { 295 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 296 return true; 297 } 298 } 299 300 // Decide if this trap can be handled by a stub. 301 address stub = NULL; 302 address pc = NULL; // Pc as retrieved from PSW. Usually points past failing instruction. 303 address trap_pc = NULL; // Pc of the instruction causing the trap. 304 305 //%note os_trap_1 306 if (info != NULL && uc != NULL && thread != NULL) { 307 pc = os::Linux::ucontext_get_pc(uc); 308 if (TraceTraps) { 309 tty->print_cr(" pc at " INTPTR_FORMAT, p2i(pc)); 310 } 311 if ((unsigned long)(pc - (address)info->si_addr) <= (unsigned long)Assembler::instr_maxlen() ) { 312 trap_pc = (address)info->si_addr; 313 if (TraceTraps) { 314 tty->print_cr("trap_pc at " INTPTR_FORMAT, p2i(trap_pc)); 315 } 316 } 317 318 // Handle ALL stack overflow variations here 319 if (sig == SIGSEGV) { 320 address addr = (address)info->si_addr; // Address causing SIGSEGV, usually mem ref target. 321 322 // Check if fault address is within thread stack. 323 if (thread->on_local_stack(addr)) { 324 // stack overflow 325 if (thread->in_stack_yellow_reserved_zone(addr)) { 326 if (thread->thread_state() == _thread_in_Java) { 327 if (thread->in_stack_reserved_zone(addr)) { 328 frame fr; 329 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { 330 assert(fr.is_java_frame(), "Must be a Javac frame"); 331 frame activation = 332 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 333 if (activation.sp() != NULL) { 334 thread->disable_stack_reserved_zone(); 335 if (activation.is_interpreted_frame()) { 336 thread->set_reserved_stack_activation((address)activation.fp()); 337 } else { 338 thread->set_reserved_stack_activation((address)activation.unextended_sp()); 339 } 340 return 1; 341 } 342 } 343 } 344 // Throw a stack overflow exception. 345 // Guard pages will be reenabled while unwinding the stack. 346 thread->disable_stack_yellow_reserved_zone(); 347 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); 348 } else { 349 // Thread was in the vm or native code. Return and try to finish. 350 thread->disable_stack_yellow_reserved_zone(); 351 return 1; 352 } 353 } else if (thread->in_stack_red_zone(addr)) { 354 // Fatal red zone violation. Disable the guard pages and fall through 355 // to handle_unexpected_exception way down below. 356 thread->disable_stack_red_zone(); 357 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); 358 359 // This is a likely cause, but hard to verify. Let's just print 360 // it as a hint. 361 tty->print_raw_cr("Please check if any of your loaded .so files has " 362 "enabled executable stack (see man page execstack(8))"); 363 } else { 364 // Accessing stack address below sp may cause SEGV if current 365 // thread has MAP_GROWSDOWN stack. This should only happen when 366 // current thread was created by user code with MAP_GROWSDOWN flag 367 // and then attached to VM. See notes in os_linux.cpp. 368 if (thread->osthread()->expanding_stack() == 0) { 369 thread->osthread()->set_expanding_stack(); 370 if (os::Linux::manually_expand_stack(thread, addr)) { 371 thread->osthread()->clear_expanding_stack(); 372 return 1; 373 } 374 thread->osthread()->clear_expanding_stack(); 375 } else { 376 fatal("recursive segv. expanding stack."); 377 } 378 } 379 } 380 } 381 382 if (thread->thread_state() == _thread_in_Java) { 383 // Java thread running in Java code => find exception handler if any 384 // a fault inside compiled code, the interpreter, or a stub 385 386 // Handle signal from NativeJump::patch_verified_entry(). 387 if (sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { 388 if (TraceTraps) { 389 tty->print_cr("trap: zombie_not_entrant (SIGILL)"); 390 } 391 stub = SharedRuntime::get_handle_wrong_method_stub(); 392 } 393 394 else if (sig == SIGSEGV && 395 os::is_poll_address((address)info->si_addr)) { 396 if (TraceTraps) { 397 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 398 } 399 stub = SharedRuntime::get_poll_stub(pc); 400 401 // Info->si_addr only points to the page base address, so we 402 // must extract the real si_addr from the instruction and the 403 // ucontext. 404 assert(((NativeInstruction*)pc)->is_safepoint_poll(), "must be safepoint poll"); 405 const address real_si_addr = ((NativeInstruction*)pc)->get_poll_address(uc); 406 } 407 408 // SIGTRAP-based implicit null check in compiled code. 409 else if ((sig == SIGFPE) && 410 TrapBasedNullChecks && 411 (trap_pc != NULL) && 412 Assembler::is_sigtrap_zero_check(trap_pc)) { 413 if (TraceTraps) { 414 tty->print_cr("trap: NULL_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc)); 415 } 416 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL); 417 } 418 419 else if (sig == SIGSEGV && ImplicitNullChecks && 420 CodeCache::contains((void*) pc) && 421 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) { 422 if (TraceTraps) { 423 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc)); 424 } 425 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 426 } 427 428 // SIGTRAP-based implicit range check in compiled code. 429 else if (sig == SIGFPE && TrapBasedRangeChecks && 430 (trap_pc != NULL) && 431 Assembler::is_sigtrap_range_check(trap_pc)) { 432 if (TraceTraps) { 433 tty->print_cr("trap: RANGE_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc)); 434 } 435 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL); 436 } 437 438 else if (sig == SIGFPE && info->si_code == FPE_INTDIV) { 439 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); 440 } 441 442 else if (sig == SIGBUS) { 443 // BugId 4454115: A read from a MappedByteBuffer can fault here if the 444 // underlying file has been truncated. Do not crash the VM in such a case. 445 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 446 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 447 if (nm != NULL && nm->has_unsafe_access()) { 448 // We don't really need a stub here! Just set the pending exeption and 449 // continue at the next instruction after the faulting read. Returning 450 // garbage from this read is ok. 451 thread->set_pending_unsafe_access_error(); 452 uc->uc_mcontext.psw.addr = ((unsigned long)pc) + Assembler::instr_len(pc); 453 return true; 454 } 455 } 456 } 457 458 else { // thread->thread_state() != _thread_in_Java 459 if ((sig == SIGILL) && VM_Version::is_determine_features_test_running()) { 460 // SIGILL must be caused by VM_Version::determine_features() 461 // when attempting to execute a non-existing instruction. 462 //*(int *) (pc-6)=0; // Patch instruction to 0 to indicate that it causes a SIGILL. 463 // Flushing of icache is not necessary. 464 stub = pc; // Continue with next instruction. 465 } else if ((sig == SIGFPE) && VM_Version::is_determine_features_test_running()) { 466 // SIGFPE is known to be caused by trying to execute a vector instruction 467 // when the vector facility is installed, but operating system support is missing. 468 VM_Version::reset_has_VectorFacility(); 469 stub = pc; // Continue with next instruction. 470 } else if (thread->thread_state() == _thread_in_vm && 471 sig == SIGBUS && thread->doing_unsafe_access()) { 472 // We don't really need a stub here! Just set the pending exeption and 473 // continue at the next instruction after the faulting read. Returning 474 // garbage from this read is ok. 475 thread->set_pending_unsafe_access_error(); 476 os::Linux::ucontext_set_pc(uc, pc + Assembler::instr_len(pc)); 477 return true; 478 } 479 } 480 481 // Check to see if we caught the safepoint code in the 482 // process of write protecting the memory serialization page. 483 // It write enables the page immediately after protecting it 484 // so we can just return to retry the write. 485 // Info->si_addr need not be the exact address, it is only 486 // guaranteed to be on the same page as the address that caused 487 // the SIGSEGV. 488 if ((sig == SIGSEGV) && !UseMembar && 489 (os::get_memory_serialize_page() == 490 (address)((uintptr_t)info->si_addr & ~(os::vm_page_size()-1)))) { 491 return true; 492 } 493 } 494 495 if (stub != NULL) { 496 // Save all thread context in case we need to restore it. 497 if (thread != NULL) thread->set_saved_exception_pc(pc); 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 // Hand down correct pc for SIGILL, SIGFPE. pc from context 523 // usually points to the instruction after the failing instruction. 524 // Note: this should be combined with the trap_pc handling above, 525 // because it handles the same issue. 526 if (sig == SIGILL || sig == SIGFPE) { 527 pc = (address)info->si_addr; 528 } 529 530 VMError::report_and_die(t, sig, pc, info, ucVoid); 531 532 ShouldNotReachHere(); 533 return false; 534 } 535 536 void os::Linux::init_thread_fpu_state(void) { 537 // Nothing to do on z/Architecture. 538 } 539 540 int os::Linux::get_fpu_control_word(void) { 541 // Nothing to do on z/Architecture. 542 return 0; 543 } 544 545 void os::Linux::set_fpu_control_word(int fpu_control) { 546 // Nothing to do on z/Architecture. 547 } 548 549 //////////////////////////////////////////////////////////////////////////////// 550 // thread stack 551 552 // Minimum usable stack sizes required to get to user code. Space for 553 // HotSpot guard pages is added later. 554 size_t os::Posix::_compiler_thread_min_stack_allowed = (52 DEBUG_ONLY(+ 32)) * K; 555 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 8)) * K; 556 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 32 * K; 557 558 // Return default stack size for thr_type. 559 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 560 // Default stack size (compiler thread needs larger stack). 561 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K); 562 return s; 563 } 564 565 ///////////////////////////////////////////////////////////////////////////// 566 // helper functions for fatal error handler 567 568 void os::print_context(outputStream *st, const void *context) { 569 if (context == NULL) return; 570 571 const ucontext_t* uc = (const ucontext_t*)context; 572 573 st->print_cr("Processor state:"); 574 st->print_cr("----------------"); 575 st->print_cr(" ip = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.addr); 576 st->print_cr(" proc mask = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.mask); 577 st->print_cr(" fpc reg = 0x%8.8x " , uc->uc_mcontext.fpregs.fpc); 578 st->cr(); 579 580 st->print_cr("General Purpose Registers:"); 581 st->print_cr("--------------------------"); 582 for( int i = 0; i < 16; i+=2 ) { 583 st->print(" r%-2d = " INTPTR_FORMAT " " , i, uc->uc_mcontext.gregs[i]); 584 st->print(" r%-2d = " INTPTR_FORMAT " |", i+1, uc->uc_mcontext.gregs[i+1]); 585 st->print(" r%-2d = %23.1ld " , i, uc->uc_mcontext.gregs[i]); 586 st->print(" r%-2d = %23.1ld " , i+1, uc->uc_mcontext.gregs[i+1]); 587 st->cr(); 588 } 589 st->cr(); 590 591 st->print_cr("Access Registers:"); 592 st->print_cr("-----------------"); 593 for( int i = 0; i < 16; i+=2 ) { 594 st->print(" ar%-2d = 0x%8.8x ", i, uc->uc_mcontext.aregs[i]); 595 st->print(" ar%-2d = 0x%8.8x ", i+1, uc->uc_mcontext.aregs[i+1]); 596 st->cr(); 597 } 598 st->cr(); 599 600 st->print_cr("Float Registers:"); 601 st->print_cr("----------------"); 602 for (int i = 0; i < 16; i += 2) { 603 st->print(" fr%-2d = " INTPTR_FORMAT " " , i, (int64_t)(uc->uc_mcontext.fpregs.fprs[i].d)); 604 st->print(" fr%-2d = " INTPTR_FORMAT " |", i+1, (int64_t)(uc->uc_mcontext.fpregs.fprs[i+1].d)); 605 st->print(" fr%-2d = %23.15e " , i, (uc->uc_mcontext.fpregs.fprs[i].d)); 606 st->print(" fr%-2d = %23.15e " , i+1, (uc->uc_mcontext.fpregs.fprs[i+1].d)); 607 st->cr(); 608 } 609 st->cr(); 610 st->cr(); 611 612 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); 613 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp)); 614 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t)); 615 st->cr(); 616 617 // Note: it may be unsafe to inspect memory near pc. For example, pc may 618 // point to garbage if entry point in an nmethod is corrupted. Leave 619 // this at the end, and hope for the best. 620 address pc = os::Linux::ucontext_get_pc(uc); 621 if (Verbose) { st->print_cr("pc at " PTR_FORMAT, p2i(pc)); } 622 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc)); 623 print_hex_dump(st, pc-64, pc+64, /*intrsize=*/4); 624 st->cr(); 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 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.psw.addr); 636 for (int i = 0; i < 16; i++) { 637 st->print("r%-2d=", i); 638 print_location(st, uc->uc_mcontext.gregs[i]); 639 } 640 st->cr(); 641 } 642 643 #ifndef PRODUCT 644 void os::verify_stack_alignment() { 645 } 646 #endif 647 648 int os::extra_bang_size_in_bytes() { 649 // z/Architecture does not require the additional stack bang. 650 return 0; 651 }