/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: sw=4 ts=4 et : */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "mozilla/mozalloc_abort.h" #ifdef ANDROID # include <android/log.h> #endif #ifdef MOZ_WIDGET_ANDROID # include "APKOpen.h" # include "dlfcn.h" #endif #include <stdio.h> #include "mozilla/Assertions.h" void mozalloc_abort(const char* const msg) { #ifndef ANDROID fputs(msg, stderr); fputs("\n", stderr); #else __android_log_print(ANDROID_LOG_ERROR, "Gecko", "mozalloc_abort: %s", msg); #endif #ifdef MOZ_WIDGET_ANDROID abortThroughJava(msg); #endif MOZ_CRASH(); } #ifdef MOZ_WIDGET_ANDROID template <size_t N> void fillAbortMessage(char (&msg)[N], uintptr_t retAddress) { /* * On Android, we often don't have reliable backtrace when crashing inside * abort(). Therefore, we try to find out who is calling abort() and add * that to the message. */ Dl_info info = {}; dladdr(reinterpret_cast<void*>(retAddress), &info); const char* const module = info.dli_fname ? info.dli_fname : ""; const char* const base_module = strrchr(module, '/'); const void* const module_offset = reinterpret_cast<void*>(retAddress - uintptr_t(info.dli_fbase)); const char* const sym = info.dli_sname ? info.dli_sname : ""; snprintf(msg, sizeof(msg), "abort() called from %s:%p (%s)", base_module ? base_module + 1 : module, module_offset, sym); } #endif #if defined(XP_UNIX) && !defined(MOZ_ASAN) // Define abort() here, so that it is used instead of the system abort(). This // lets us control the behavior when aborting, in order to get better results // on *NIX platforms. See mozalloc_abort for details. // // For AddressSanitizer, we must not redefine system abort because the ASan // option "abort_on_error=1" calls abort() and therefore causes the following // call chain with our redefined abort: // // ASan -> abort() -> moz_abort() -> MOZ_CRASH() -> Segmentation fault // // That segmentation fault will be interpreted as another bug by ASan and as a // result, ASan will just exit(1) instead of aborting. void abort(void) { #ifdef MOZ_WIDGET_ANDROID char msg[64] = {}; fillAbortMessage(msg, uintptr_t(__builtin_return_address(0))); #else const char* const msg = "Redirecting call to abort() to mozalloc_abort\n"; #endif mozalloc_abort(msg); // We won't reach here because mozalloc_abort() is MOZ_NORETURN. But that // annotation isn't used on ARM (see mozalloc_abort.h for why) so we add a // redundant MOZ_CRASH() here to avoid a "'noreturn' function does return" // warning. MOZ_CRASH(); } #endif