| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "runtime.h" |
| |
| #include <signal.h> |
| #include <string.h> |
| #include <sys/utsname.h> |
| |
| #include "base/logging.h" |
| #include "base/mutex.h" |
| #include "base/stringprintf.h" |
| #include "thread.h" |
| #include "utils.h" |
| |
| namespace art { |
| |
| struct Backtrace { |
| void Dump(std::ostream& os) { |
| DumpNativeStack(os, GetTid(), "\t", true); |
| } |
| }; |
| |
| struct OsInfo { |
| void Dump(std::ostream& os) { |
| utsname info; |
| uname(&info); |
| // Linux 2.6.38.8-gg784 (x86_64) |
| // Darwin 11.4.0 (x86_64) |
| os << info.sysname << " " << info.release << " (" << info.machine << ")"; |
| } |
| }; |
| |
| static const char* GetSignalName(int signal_number) { |
| switch (signal_number) { |
| case SIGABRT: return "SIGABRT"; |
| case SIGBUS: return "SIGBUS"; |
| case SIGFPE: return "SIGFPE"; |
| case SIGILL: return "SIGILL"; |
| case SIGPIPE: return "SIGPIPE"; |
| case SIGSEGV: return "SIGSEGV"; |
| #if defined(SIGSTKFLT) |
| case SIGSTKFLT: return "SIGSTKFLT"; |
| #endif |
| case SIGTRAP: return "SIGTRAP"; |
| } |
| return "??"; |
| } |
| |
| static const char* GetSignalCodeName(int signal_number, int signal_code) { |
| // Try the signal-specific codes... |
| switch (signal_number) { |
| case SIGILL: |
| switch (signal_code) { |
| case ILL_ILLOPC: return "ILL_ILLOPC"; |
| case ILL_ILLOPN: return "ILL_ILLOPN"; |
| case ILL_ILLADR: return "ILL_ILLADR"; |
| case ILL_ILLTRP: return "ILL_ILLTRP"; |
| case ILL_PRVOPC: return "ILL_PRVOPC"; |
| case ILL_PRVREG: return "ILL_PRVREG"; |
| case ILL_COPROC: return "ILL_COPROC"; |
| case ILL_BADSTK: return "ILL_BADSTK"; |
| } |
| break; |
| case SIGBUS: |
| switch (signal_code) { |
| case BUS_ADRALN: return "BUS_ADRALN"; |
| case BUS_ADRERR: return "BUS_ADRERR"; |
| case BUS_OBJERR: return "BUS_OBJERR"; |
| } |
| break; |
| case SIGFPE: |
| switch (signal_code) { |
| case FPE_INTDIV: return "FPE_INTDIV"; |
| case FPE_INTOVF: return "FPE_INTOVF"; |
| case FPE_FLTDIV: return "FPE_FLTDIV"; |
| case FPE_FLTOVF: return "FPE_FLTOVF"; |
| case FPE_FLTUND: return "FPE_FLTUND"; |
| case FPE_FLTRES: return "FPE_FLTRES"; |
| case FPE_FLTINV: return "FPE_FLTINV"; |
| case FPE_FLTSUB: return "FPE_FLTSUB"; |
| } |
| break; |
| case SIGSEGV: |
| switch (signal_code) { |
| case SEGV_MAPERR: return "SEGV_MAPERR"; |
| case SEGV_ACCERR: return "SEGV_ACCERR"; |
| } |
| break; |
| case SIGTRAP: |
| switch (signal_code) { |
| case TRAP_BRKPT: return "TRAP_BRKPT"; |
| case TRAP_TRACE: return "TRAP_TRACE"; |
| } |
| break; |
| } |
| // Then the other codes... |
| switch (signal_code) { |
| case SI_USER: return "SI_USER"; |
| #if defined(SI_KERNEL) |
| case SI_KERNEL: return "SI_KERNEL"; |
| #endif |
| case SI_QUEUE: return "SI_QUEUE"; |
| case SI_TIMER: return "SI_TIMER"; |
| case SI_MESGQ: return "SI_MESGQ"; |
| case SI_ASYNCIO: return "SI_ASYNCIO"; |
| #if defined(SI_SIGIO) |
| case SI_SIGIO: return "SI_SIGIO"; |
| #endif |
| #if defined(SI_TKILL) |
| case SI_TKILL: return "SI_TKILL"; |
| #endif |
| } |
| // Then give up... |
| return "?"; |
| } |
| |
| struct UContext { |
| explicit UContext(void* raw_context) : context(reinterpret_cast<ucontext_t*>(raw_context)->uc_mcontext) {} |
| |
| void Dump(std::ostream& os) { |
| // TODO: support non-x86 hosts (not urgent because this code doesn't run on targets). |
| #if defined(__APPLE__) |
| DumpRegister32(os, "eax", context->__ss.__eax); |
| DumpRegister32(os, "ebx", context->__ss.__ebx); |
| DumpRegister32(os, "ecx", context->__ss.__ecx); |
| DumpRegister32(os, "edx", context->__ss.__edx); |
| os << '\n'; |
| |
| DumpRegister32(os, "edi", context->__ss.__edi); |
| DumpRegister32(os, "esi", context->__ss.__esi); |
| DumpRegister32(os, "ebp", context->__ss.__ebp); |
| DumpRegister32(os, "esp", context->__ss.__esp); |
| os << '\n'; |
| |
| DumpRegister32(os, "eip", context->__ss.__eip); |
| os << " "; |
| DumpRegister32(os, "eflags", context->__ss.__eflags); |
| DumpX86Flags(os, context->__ss.__eflags); |
| os << '\n'; |
| |
| DumpRegister32(os, "cs", context->__ss.__cs); |
| DumpRegister32(os, "ds", context->__ss.__ds); |
| DumpRegister32(os, "es", context->__ss.__es); |
| DumpRegister32(os, "fs", context->__ss.__fs); |
| os << '\n'; |
| DumpRegister32(os, "gs", context->__ss.__gs); |
| DumpRegister32(os, "ss", context->__ss.__ss); |
| #else |
| DumpRegister32(os, "eax", context.gregs[REG_EAX]); |
| DumpRegister32(os, "ebx", context.gregs[REG_EBX]); |
| DumpRegister32(os, "ecx", context.gregs[REG_ECX]); |
| DumpRegister32(os, "edx", context.gregs[REG_EDX]); |
| os << '\n'; |
| |
| DumpRegister32(os, "edi", context.gregs[REG_EDI]); |
| DumpRegister32(os, "esi", context.gregs[REG_ESI]); |
| DumpRegister32(os, "ebp", context.gregs[REG_EBP]); |
| DumpRegister32(os, "esp", context.gregs[REG_ESP]); |
| os << '\n'; |
| |
| DumpRegister32(os, "eip", context.gregs[REG_EIP]); |
| os << " "; |
| DumpRegister32(os, "eflags", context.gregs[REG_EFL]); |
| DumpX86Flags(os, context.gregs[REG_EFL]); |
| os << '\n'; |
| |
| DumpRegister32(os, "cs", context.gregs[REG_CS]); |
| DumpRegister32(os, "ds", context.gregs[REG_DS]); |
| DumpRegister32(os, "es", context.gregs[REG_ES]); |
| DumpRegister32(os, "fs", context.gregs[REG_FS]); |
| os << '\n'; |
| DumpRegister32(os, "gs", context.gregs[REG_GS]); |
| DumpRegister32(os, "ss", context.gregs[REG_SS]); |
| #endif |
| } |
| |
| void DumpRegister32(std::ostream& os, const char* name, uint32_t value) { |
| os << StringPrintf(" %6s: 0x%08x", name, value); |
| } |
| |
| void DumpX86Flags(std::ostream& os, uint32_t flags) { |
| os << " ["; |
| if ((flags & (1 << 0)) != 0) { |
| os << " CF"; |
| } |
| if ((flags & (1 << 2)) != 0) { |
| os << " PF"; |
| } |
| if ((flags & (1 << 4)) != 0) { |
| os << " AF"; |
| } |
| if ((flags & (1 << 6)) != 0) { |
| os << " ZF"; |
| } |
| if ((flags & (1 << 7)) != 0) { |
| os << " SF"; |
| } |
| if ((flags & (1 << 8)) != 0) { |
| os << " TF"; |
| } |
| if ((flags & (1 << 9)) != 0) { |
| os << " IF"; |
| } |
| if ((flags & (1 << 10)) != 0) { |
| os << " DF"; |
| } |
| if ((flags & (1 << 11)) != 0) { |
| os << " OF"; |
| } |
| os << " ]"; |
| } |
| |
| mcontext_t& context; |
| }; |
| |
| void HandleUnexpectedSignal(int signal_number, siginfo_t* info, void* raw_context) { |
| static bool handlingUnexpectedSignal = false; |
| if (handlingUnexpectedSignal) { |
| LogMessageData data(__FILE__, __LINE__, INTERNAL_FATAL, -1); |
| LogMessage::LogLine(data, "HandleUnexpectedSignal reentered\n"); |
| _exit(1); |
| } |
| handlingUnexpectedSignal = true; |
| |
| gAborting++; // set before taking any locks |
| MutexLock mu(Thread::Current(), *Locks::unexpected_signal_lock_); |
| |
| bool has_address = (signal_number == SIGILL || signal_number == SIGBUS || |
| signal_number == SIGFPE || signal_number == SIGSEGV); |
| |
| OsInfo os_info; |
| const char* cmd_line = GetCmdLine(); |
| if (cmd_line == NULL) { |
| cmd_line = "<unset>"; // Because no-one called InitLogging. |
| } |
| pid_t tid = GetTid(); |
| std::string thread_name(GetThreadName(tid)); |
| UContext thread_context(raw_context); |
| Backtrace thread_backtrace; |
| |
| LOG(INTERNAL_FATAL) << "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n" |
| << StringPrintf("Fatal signal %d (%s), code %d (%s)", |
| signal_number, GetSignalName(signal_number), |
| info->si_code, |
| GetSignalCodeName(signal_number, info->si_code)) |
| << (has_address ? StringPrintf(" fault addr %p", info->si_addr) : "") << "\n" |
| << "OS: " << Dumpable<OsInfo>(os_info) << "\n" |
| << "Cmdline: " << cmd_line << "\n" |
| << "Thread: " << tid << " \"" << thread_name << "\"\n" |
| << "Registers:\n" << Dumpable<UContext>(thread_context) << "\n" |
| << "Backtrace:\n" << Dumpable<Backtrace>(thread_backtrace); |
| |
| if (getenv("debug_db_uid") != NULL || getenv("art_wait_for_gdb_on_crash") != NULL) { |
| LOG(INTERNAL_FATAL) << "********************************************************\n" |
| << "* Process " << getpid() << " thread " << tid << " \"" << thread_name << "\"" |
| << " has been suspended while crashing.\n" |
| << "* Attach gdb:\n" |
| << "* gdb -p " << tid << "\n" |
| << "********************************************************\n"; |
| // Wait for debugger to attach. |
| while (true) { |
| } |
| } |
| |
| // Remove our signal handler for this signal... |
| struct sigaction action; |
| memset(&action, 0, sizeof(action)); |
| sigemptyset(&action.sa_mask); |
| action.sa_handler = SIG_DFL; |
| sigaction(signal_number, &action, NULL); |
| // ...and re-raise so we die with the appropriate status. |
| kill(getpid(), signal_number); |
| } |
| |
| void Runtime::InitPlatformSignalHandlers() { |
| // On the host, we don't have debuggerd to dump a stack for us when something unexpected happens. |
| struct sigaction action; |
| memset(&action, 0, sizeof(action)); |
| sigemptyset(&action.sa_mask); |
| action.sa_sigaction = HandleUnexpectedSignal; |
| // Use the three-argument sa_sigaction handler. |
| action.sa_flags |= SA_SIGINFO; |
| // Use the alternate signal stack so we can catch stack overflows. |
| action.sa_flags |= SA_ONSTACK; |
| |
| int rc = 0; |
| rc += sigaction(SIGABRT, &action, NULL); |
| rc += sigaction(SIGBUS, &action, NULL); |
| rc += sigaction(SIGFPE, &action, NULL); |
| rc += sigaction(SIGILL, &action, NULL); |
| rc += sigaction(SIGPIPE, &action, NULL); |
| rc += sigaction(SIGSEGV, &action, NULL); |
| #if defined(SIGSTKFLT) |
| rc += sigaction(SIGSTKFLT, &action, NULL); |
| #endif |
| rc += sigaction(SIGTRAP, &action, NULL); |
| CHECK_EQ(rc, 0); |
| } |
| |
| } // namespace art |