aoqi@0: /*
aoqi@0:  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "runtime/arguments.hpp"
aoqi@0: #include "runtime/os.hpp"
aoqi@0: #include "runtime/thread.hpp"
aoqi@0: #include "utilities/vmError.hpp"
aoqi@0: 
aoqi@0: #include <sys/types.h>
aoqi@0: #include <sys/wait.h>
aoqi@0: #include <sys/syscall.h>
aoqi@0: #include <unistd.h>
aoqi@0: #include <signal.h>
aoqi@0: 
aoqi@0: void VMError::show_message_box(char *buf, int buflen) {
aoqi@0:   bool yes;
aoqi@0:   do {
aoqi@0:     error_string(buf, buflen);
aoqi@0:     int len = (int)strlen(buf);
aoqi@0:     char *p = &buf[len];
aoqi@0: 
aoqi@0:     jio_snprintf(p, buflen - len,
aoqi@0:                "\n\n"
aoqi@0:                "Do you want to debug the problem?\n\n"
aoqi@0:                "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " UINTX_FORMAT " (" INTPTR_FORMAT ")\n"
aoqi@0:                "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
aoqi@0:                "Otherwise, press RETURN to abort...",
aoqi@0:                os::current_process_id(), os::current_process_id(),
aoqi@0:                os::current_thread_id(), os::current_thread_id());
aoqi@0: 
aoqi@0:     yes = os::message_box("Unexpected Error", buf);
aoqi@0: 
aoqi@0:     if (yes) {
aoqi@0:       // yes, user asked VM to launch debugger
aoqi@0:       jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
aoqi@0:                    os::current_process_id(), os::current_process_id());
aoqi@0: 
aoqi@0:       os::fork_and_exec(buf);
aoqi@0:       yes = false;
aoqi@0:     }
aoqi@0:   } while (yes);
aoqi@0: }
aoqi@0: 
aoqi@0: // Space for our "saved" signal flags and handlers
aoqi@0: static int resettedSigflags[2];
aoqi@0: static address resettedSighandler[2];
aoqi@0: 
aoqi@0: static void save_signal(int idx, int sig)
aoqi@0: {
aoqi@0:   struct sigaction sa;
aoqi@0:   sigaction(sig, NULL, &sa);
aoqi@0:   resettedSigflags[idx]   = sa.sa_flags;
aoqi@0:   resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
aoqi@0:                               ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
aoqi@0:                               : CAST_FROM_FN_PTR(address, sa.sa_handler);
aoqi@0: }
aoqi@0: 
aoqi@0: int VMError::get_resetted_sigflags(int sig) {
aoqi@0:   if(SIGSEGV == sig) {
aoqi@0:     return resettedSigflags[0];
aoqi@0:   } else if(SIGBUS == sig) {
aoqi@0:     return resettedSigflags[1];
aoqi@0:   }
aoqi@0:   return -1;
aoqi@0: }
aoqi@0: 
aoqi@0: address VMError::get_resetted_sighandler(int sig) {
aoqi@0:   if(SIGSEGV == sig) {
aoqi@0:     return resettedSighandler[0];
aoqi@0:   } else if(SIGBUS == sig) {
aoqi@0:     return resettedSighandler[1];
aoqi@0:   }
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
aoqi@0:   // unmask current signal
aoqi@0:   sigset_t newset;
aoqi@0:   sigemptyset(&newset);
aoqi@0:   sigaddset(&newset, sig);
aoqi@0:   sigprocmask(SIG_UNBLOCK, &newset, NULL);
aoqi@0: 
aoqi@0:   VMError err(NULL, sig, NULL, info, ucVoid);
aoqi@0:   err.report_and_die();
aoqi@0: }
aoqi@0: 
aoqi@0: void VMError::reset_signal_handlers() {
aoqi@0:   // Save sigflags for resetted signals
aoqi@0:   save_signal(0, SIGSEGV);
aoqi@0:   save_signal(1, SIGBUS);
aoqi@0:   os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
aoqi@0:   os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
aoqi@0: }