| /* |
| * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "memory/metaspaceShared.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/thread.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/vmError.hpp" |
| |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <signal.h> |
| |
| #ifdef LINUX |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| #endif |
| #ifdef SOLARIS |
| #include <thread.h> |
| #endif |
| #ifdef AIX |
| #include <unistd.h> |
| #endif |
| #ifdef BSD |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| #endif |
| |
| |
| // handle all synchronous program error signals which may happen during error |
| // reporting. They must be unblocked, caught, handled. |
| |
| static const int SIGNALS[] = { SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP }; // add more if needed |
| static const int NUM_SIGNALS = sizeof(SIGNALS) / sizeof(int); |
| |
| // Space for our "saved" signal flags and handlers |
| static int resettedSigflags[NUM_SIGNALS]; |
| static address resettedSighandler[NUM_SIGNALS]; |
| |
| // Needed for cancelable steps. |
| static volatile pthread_t reporter_thread_id; |
| |
| void VMError::reporting_started() { |
| // record pthread id of reporter thread. |
| reporter_thread_id = ::pthread_self(); |
| } |
| |
| void VMError::interrupt_reporting_thread() { |
| // We misuse SIGILL here, but it does not really matter. We need |
| // a signal which is handled by crash_handler and not likely to |
| // occurr during error reporting itself. |
| ::pthread_kill(reporter_thread_id, SIGILL); |
| } |
| |
| static void save_signal(int idx, int sig) |
| { |
| struct sigaction sa; |
| sigaction(sig, NULL, &sa); |
| resettedSigflags[idx] = sa.sa_flags; |
| resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) |
| ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) |
| : CAST_FROM_FN_PTR(address, sa.sa_handler); |
| } |
| |
| int VMError::get_resetted_sigflags(int sig) { |
| for (int i = 0; i < NUM_SIGNALS; i++) { |
| if (SIGNALS[i] == sig) { |
| return resettedSigflags[i]; |
| } |
| } |
| return -1; |
| } |
| |
| address VMError::get_resetted_sighandler(int sig) { |
| for (int i = 0; i < NUM_SIGNALS; i++) { |
| if (SIGNALS[i] == sig) { |
| return resettedSighandler[i]; |
| } |
| } |
| return NULL; |
| } |
| |
| static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { |
| // unmask current signal |
| sigset_t newset; |
| sigemptyset(&newset); |
| sigaddset(&newset, sig); |
| // also unmask other synchronous signals |
| for (int i = 0; i < NUM_SIGNALS; i++) { |
| sigaddset(&newset, SIGNALS[i]); |
| } |
| os::Posix::unblock_thread_signal_mask(&newset); |
| |
| // support safefetch faults in error handling |
| ucontext_t* const uc = (ucontext_t*) ucVoid; |
| address pc = (uc != NULL) ? os::Posix::ucontext_get_pc(uc) : NULL; |
| |
| // Correct pc for SIGILL, SIGFPE (see JDK-8176872) |
| if (sig == SIGILL || sig == SIGFPE) { |
| pc = (address) info->si_addr; |
| } |
| |
| // Needed to make it possible to call SafeFetch.. APIs in error handling. |
| if (uc && pc && StubRoutines::is_safefetch_fault(pc)) { |
| os::Posix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); |
| return; |
| } |
| |
| // Needed because asserts may happen in error handling too. |
| #ifdef CAN_SHOW_REGISTERS_ON_ASSERT |
| if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { |
| if (handle_assert_poison_fault(ucVoid, info->si_addr)) { |
| return; |
| } |
| } |
| #endif // CAN_SHOW_REGISTERS_ON_ASSERT |
| |
| VMError::report_and_die(NULL, sig, pc, info, ucVoid); |
| } |
| |
| void VMError::reset_signal_handlers() { |
| // install signal handlers for all synchronous program error signals |
| sigset_t newset; |
| sigemptyset(&newset); |
| |
| for (int i = 0; i < NUM_SIGNALS; i++) { |
| save_signal(i, SIGNALS[i]); |
| os::signal(SIGNALS[i], CAST_FROM_FN_PTR(void *, crash_handler)); |
| sigaddset(&newset, SIGNALS[i]); |
| } |
| os::Posix::unblock_thread_signal_mask(&newset); |
| |
| } |
| |
| // Write a hint to the stream in case siginfo relates to a segv/bus error |
| // and the offending address points into CDS archive. |
| void VMError::check_failing_cds_access(outputStream* st, const void* siginfo) { |
| #if INCLUDE_CDS |
| if (siginfo && UseSharedSpaces) { |
| const siginfo_t* const si = (siginfo_t*)siginfo; |
| if (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) { |
| const void* const fault_addr = si->si_addr; |
| if (fault_addr != NULL) { |
| if (MetaspaceShared::is_in_shared_metaspace(fault_addr)) { |
| st->print("Error accessing class data sharing archive. " |
| "Mapped file inaccessible during execution, possible disk/network problem."); |
| } |
| } |
| } |
| } |
| #endif |
| } |
| |