1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <signal.h> 18 #include <string.h> 19 #include <sys/utsname.h> 20 #include <inttypes.h> 21 22 #include "base/logging.h" 23 #include "base/mutex.h" 24 #include "base/stringprintf.h" 25 #include "thread-inl.h" 26 #include "utils.h" 27 28 namespace art { 29 30 static constexpr bool kDumpHeapObjectOnSigsevg = false; 31 static constexpr bool kUseSignalHandler = false; 32 33 struct sigaction old_action; 34 void HandleUnexpectedSignal(int signal_number, siginfo_t* info, void* raw_context) { 35 static bool handlingUnexpectedSignal = false; 36 if (handlingUnexpectedSignal) { 37 LogMessageData data(__FILE__, __LINE__, INTERNAL_FATAL, -1); 38 LogMessage::LogLine(data, "HandleUnexpectedSignal reentered\n"); 39 _exit(1); 40 } 41 handlingUnexpectedSignal = true; 42 gAborting++; // set before taking any locks 43 MutexLock mu(Thread::Current(), *Locks::unexpected_signal_lock_); 44 45 Runtime* runtime = Runtime::Current(); 46 if (runtime != nullptr) { 47 // Print this out first in case DumpObject faults. 48 LOG(INTERNAL_FATAL) << "Fault message: " << runtime->GetFaultMessage(); 49 gc::Heap* heap = runtime->GetHeap(); 50 if (kDumpHeapObjectOnSigsevg && heap != nullptr && info != nullptr) { 51 LOG(INTERNAL_FATAL) << "Dump heap object at fault address: "; 52 heap->DumpObject(LOG(INTERNAL_FATAL), reinterpret_cast<mirror::Object*>(info->si_addr)); 53 } 54 } 55 // Run the old signal handler. 56 old_action.sa_sigaction(signal_number, info, raw_context); 57 } 58 59 void Runtime::InitPlatformSignalHandlers() { 60 if (kUseSignalHandler) { 61 struct sigaction action; 62 memset(&action, 0, sizeof(action)); 63 sigemptyset(&action.sa_mask); 64 action.sa_sigaction = HandleUnexpectedSignal; 65 // Use the three-argument sa_sigaction handler. 66 action.sa_flags |= SA_SIGINFO; 67 // Use the alternate signal stack so we can catch stack overflows. 68 action.sa_flags |= SA_ONSTACK; 69 int rc = 0; 70 rc += sigaction(SIGSEGV, &action, &old_action); 71 CHECK_EQ(rc, 0); 72 } 73 } 74 75 } // namespace art 76
