| /* |
| * Copyright (c) 2003, 2013, 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 "runtime/arguments.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/thread.hpp" |
| #include "utilities/vmError.hpp" |
| |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| #include <signal.h> |
| |
| void VMError::show_message_box(char *buf, int buflen) { |
| bool yes; |
| do { |
| error_string(buf, buflen); |
| int len = (int)strlen(buf); |
| char *p = &buf[len]; |
| |
| jio_snprintf(p, buflen - len, |
| "\n\n" |
| "Do you want to debug the problem?\n\n" |
| "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" |
| "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" |
| "Otherwise, press RETURN to abort...", |
| os::current_process_id(), |
| os::current_thread_id(), thread_self()); |
| |
| yes = os::message_box("Unexpected Error", buf); |
| |
| if (yes) { |
| // yes, user asked VM to launch debugger |
| jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); |
| |
| os::fork_and_exec(buf); |
| yes = false; |
| } |
| } while (yes); |
| } |
| |
| // Handle all synchronous signals which may happen during signal handling, |
| // not just SIGSEGV and SIGBUS. |
| 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]; |
| |
| 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); |
| // and all other synchronous signals too. |
| for (int i = 0; i < NUM_SIGNALS; i++) { |
| sigaddset(&newset, SIGNALS[i]); |
| } |
| sigthreadmask(SIG_UNBLOCK, &newset, NULL); |
| |
| // support safefetch faults in error handling |
| ucontext_t* const uc = (ucontext_t*) ucVoid; |
| address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL; |
| if (uc && pc && StubRoutines::is_safefetch_fault(pc)) { |
| os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); |
| return; |
| } |
| |
| VMError::report_and_die(NULL, sig, pc, info, ucVoid); |
| } |
| |
| void VMError::reset_signal_handlers() { |
| 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]); |
| } |
| |
| sigthreadmask(SIG_UNBLOCK, &newset, NULL); |
| } |