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3960
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1 /*
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2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "runtime/arguments.hpp"
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27 #include "runtime/os.hpp"
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28 #include "runtime/thread.hpp"
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29 #include "utilities/vmError.hpp"
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30
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31 #include <sys/types.h>
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32 #include <sys/wait.h>
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33 #include <sys/syscall.h>
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34 #include <unistd.h>
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35 #include <signal.h>
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36
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37 void VMError::show_message_box(char *buf, int buflen) {
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38 bool yes;
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39 do {
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40 error_string(buf, buflen);
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41 int len = (int)strlen(buf);
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42 char *p = &buf[len];
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43
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44 jio_snprintf(p, buflen - len,
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45 "\n\n"
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46 "Do you want to debug the problem?\n\n"
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47 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
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48 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
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49 "Otherwise, press RETURN to abort...",
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50 os::current_process_id(), os::current_process_id(),
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51 os::current_thread_id(), os::current_thread_id());
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52
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53 yes = os::message_box("Unexpected Error", buf);
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54
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55 if (yes) {
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56 // yes, user asked VM to launch debugger
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57 jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
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58 os::current_process_id(), os::current_process_id());
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59
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60 os::fork_and_exec(buf);
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61 yes = false;
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62 }
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63 } while (yes);
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64 }
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65
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66 // Space for our "saved" signal flags and handlers
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67 static int resettedSigflags[2];
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68 static address resettedSighandler[2];
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69
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70 static void save_signal(int idx, int sig)
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71 {
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72 struct sigaction sa;
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73 sigaction(sig, NULL, &sa);
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74 resettedSigflags[idx] = sa.sa_flags;
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75 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
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76 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
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77 : CAST_FROM_FN_PTR(address, sa.sa_handler);
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78 }
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79
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80 int VMError::get_resetted_sigflags(int sig) {
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81 if(SIGSEGV == sig) {
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82 return resettedSigflags[0];
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83 } else if(SIGBUS == sig) {
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84 return resettedSigflags[1];
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85 }
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86 return -1;
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87 }
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88
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89 address VMError::get_resetted_sighandler(int sig) {
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90 if(SIGSEGV == sig) {
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91 return resettedSighandler[0];
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92 } else if(SIGBUS == sig) {
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93 return resettedSighandler[1];
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94 }
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95 return NULL;
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96 }
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97
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98 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
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99 // unmask current signal
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100 sigset_t newset;
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101 sigemptyset(&newset);
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102 sigaddset(&newset, sig);
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103 sigprocmask(SIG_UNBLOCK, &newset, NULL);
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104
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105 VMError err(NULL, sig, NULL, info, ucVoid);
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106 err.report_and_die();
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107 }
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108
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109 void VMError::reset_signal_handlers() {
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110 // Save sigflags for resetted signals
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111 save_signal(0, SIGSEGV);
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112 save_signal(1, SIGBUS);
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113 os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
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114 os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
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115 }
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