1 /* 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "runtime/arguments.hpp" 27 #include "runtime/os.hpp" 28 #include "runtime/thread.hpp" 29 #include "utilities/vmError.hpp" 30 31 #include <sys/types.h> 32 #include <sys/wait.h> 33 #include <unistd.h> 34 #include <signal.h> 35 36 void VMError::show_message_box(char *buf, int buflen, int id, const char* message, const char* detail_fmt, 37 va_list detail_args, address pc, const char* filename, int lineno) { 38 bool yes; 39 do { 40 error_string(buf, buflen, id, message, detail_fmt, detail_args, pc, filename, lineno); 41 int len = (int)strlen(buf); 42 char *p = &buf[len]; 43 44 jio_snprintf(p, buflen - len, 45 "\n\n" 46 "Do you want to debug the problem?\n\n" 47 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 48 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 49 "Otherwise, press RETURN to abort...", 50 os::current_process_id(), 51 os::current_thread_id(), thread_self()); 52 53 yes = os::message_box("Unexpected Error", buf); 54 55 if (yes) { 56 // yes, user asked VM to launch debugger 57 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 58 59 os::fork_and_exec(buf); 60 yes = false; 61 } 62 } while (yes); 63 } 64 65 // Handle all synchronous signals which may happen during signal handling, 66 // not just SIGSEGV and SIGBUS. 67 static const int SIGNALS[] = { SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP }; // add more if needed 68 static const int NUM_SIGNALS = sizeof(SIGNALS) / sizeof(int); 69 70 // Space for our "saved" signal flags and handlers 71 static int resettedSigflags[NUM_SIGNALS]; 72 static address resettedSighandler[NUM_SIGNALS]; 73 74 static void save_signal(int idx, int sig) { 75 struct sigaction sa; 76 sigaction(sig, NULL, &sa); 77 resettedSigflags[idx] = sa.sa_flags; 78 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) 79 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 80 : CAST_FROM_FN_PTR(address, sa.sa_handler); 81 } 82 83 int VMError::get_resetted_sigflags(int sig) { 84 for (int i = 0; i < NUM_SIGNALS; i++) { 85 if (SIGNALS[i] == sig) { 86 return resettedSigflags[i]; 87 } 88 } 89 return -1; 90 } 91 92 address VMError::get_resetted_sighandler(int sig) { 93 for (int i = 0; i < NUM_SIGNALS; i++) { 94 if (SIGNALS[i] == sig) { 95 return resettedSighandler[i]; 96 } 97 } 98 return NULL; 99 } 100 101 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { 102 103 // Unmask current signal. 104 sigset_t newset; 105 sigemptyset(&newset); 106 sigaddset(&newset, sig); 107 // and all other synchronous signals too. 108 for (int i = 0; i < NUM_SIGNALS; i++) { 109 sigaddset(&newset, SIGNALS[i]); 110 } 111 sigthreadmask(SIG_UNBLOCK, &newset, NULL); 112 113 // support safefetch faults in error handling 114 ucontext_t* const uc = (ucontext_t*) ucVoid; 115 address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL; 116 if (uc && pc && StubRoutines::is_safefetch_fault(pc)) { 117 os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 118 return; 119 } 120 121 VMError::report_and_die(NULL, sig, pc, info, ucVoid); 122 } 123 124 void VMError::reset_signal_handlers() { 125 sigset_t newset; 126 sigemptyset(&newset); 127 128 for (int i = 0; i < NUM_SIGNALS; i++) { 129 save_signal(i, SIGNALS[i]); 130 os::signal(SIGNALS[i], CAST_FROM_FN_PTR(void *, crash_handler)); 131 sigaddset(&newset, SIGNALS[i]); 132 } 133 134 sigthreadmask(SIG_UNBLOCK, &newset, NULL); 135 }