1 /* 2 * Copyright (c) 2003, 2015, 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 "memory/filemap.hpp" 27 #include "runtime/arguments.hpp" 28 #include "runtime/os.hpp" 29 #include "runtime/thread.hpp" 30 #include "utilities/vmError.hpp" 31 32 #include <sys/types.h> 33 #include <sys/wait.h> 34 #include <signal.h> 35 36 #ifdef TARGET_OS_FAMILY_linux 37 #include <sys/syscall.h> 38 #include <unistd.h> 39 #endif 40 #ifdef TARGET_OS_FAMILY_solaris 41 #include <thread.h> 42 #endif 43 #ifdef TARGET_OS_FAMILY_aix 44 #include <unistd.h> 45 #endif 46 #ifdef TARGET_OS_FAMILY_bsd 47 #include <sys/syscall.h> 48 #include <unistd.h> 49 #endif 50 51 52 // handle all synchronous program error signals which may happen during error 53 // reporting. They must be unblocked, caught, handled. 54 55 static const int SIGNALS[] = { SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP }; // add more if needed 56 static const int NUM_SIGNALS = sizeof(SIGNALS) / sizeof(int); 57 58 // Space for our "saved" signal flags and handlers 59 static int resettedSigflags[NUM_SIGNALS]; 60 static address resettedSighandler[NUM_SIGNALS]; 61 62 static void save_signal(int idx, int sig) 63 { 64 struct sigaction sa; 65 sigaction(sig, NULL, &sa); 66 resettedSigflags[idx] = sa.sa_flags; 67 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) 68 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 69 : CAST_FROM_FN_PTR(address, sa.sa_handler); 70 } 71 72 int VMError::get_resetted_sigflags(int sig) { 73 for (int i = 0; i < NUM_SIGNALS; i++) { 74 if (SIGNALS[i] == sig) { 75 return resettedSigflags[i]; 76 } 77 } 78 return -1; 79 } 80 81 address VMError::get_resetted_sighandler(int sig) { 82 for (int i = 0; i < NUM_SIGNALS; i++) { 83 if (SIGNALS[i] == sig) { 84 return resettedSighandler[i]; 85 } 86 } 87 return NULL; 88 } 89 90 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { 91 // unmask current signal 92 sigset_t newset; 93 sigemptyset(&newset); 94 sigaddset(&newset, sig); 95 // also unmask other synchronous signals 96 for (int i = 0; i < NUM_SIGNALS; i++) { 97 sigaddset(&newset, SIGNALS[i]); 98 } 99 os::Posix::unblock_thread_signal_mask(&newset); 100 101 // support safefetch faults in error handling 102 ucontext_t* const uc = (ucontext_t*) ucVoid; 103 address const pc = uc ? os::Posix::ucontext_get_pc(uc) : NULL; 104 105 if (uc && pc && StubRoutines::is_safefetch_fault(pc)) { 106 os::Posix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); 107 return; 108 } 109 110 VMError::report_and_die(NULL, sig, pc, info, ucVoid); 111 } 112 113 void VMError::reset_signal_handlers() { 114 // install signal handlers for all synchronous program error signals 115 sigset_t newset; 116 sigemptyset(&newset); 117 118 for (int i = 0; i < NUM_SIGNALS; i++) { 119 save_signal(i, SIGNALS[i]); 120 os::signal(SIGNALS[i], CAST_FROM_FN_PTR(void *, crash_handler)); 121 sigaddset(&newset, SIGNALS[i]); 122 } 123 os::Posix::unblock_thread_signal_mask(&newset); 124 125 } 126 127 // Write a hint to the stream in case siginfo relates to a segv/bus error 128 // and the offending address points into CDS archive. 129 void VMError::check_failing_cds_access(outputStream* st, const void* siginfo) { 130 if (siginfo && UseSharedSpaces) { 131 const siginfo_t* const si = (siginfo_t*)siginfo; 132 if (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) { 133 const void* const fault_addr = si->si_addr; 134 if (fault_addr != NULL) { 135 FileMapInfo* const mapinfo = FileMapInfo::current_info(); 136 if (mapinfo->is_in_shared_space(fault_addr)) { 137 st->print("Error accessing class data sharing archive. " 138 "Mapped file inaccessible during execution, possible disk/network problem."); 139 } 140 } 141 } 142 } 143 } 144