1 // Copyright (C) 2012 The Android Open Source Project
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions
6 // are met:
7 // 1. Redistributions of source code must retain the above copyright
8 // notice, this list of conditions and the following disclaimer.
9 // 2. Redistributions in binary form must reproduce the above copyright
10 // notice, this list of conditions and the following disclaimer in the
11 // documentation and/or other materials provided with the distribution.
12 // 3. Neither the name of the project nor the names of its contributors
13 // may be used to endorse or promote products derived from this software
14 // without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 // ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 // SUCH DAMAGE.
27
28 #include <android/log.h>
29 #include <dlfcn.h>
30 #include <stdio.h>
31
32 #include "cxxabi_defines.h"
33
34 namespace __gabixx {
35
__fatal_error(const char * message)36 _GABIXX_NORETURN void __fatal_error(const char* message) {
37
38 // Note: Printing to stderr is only useful when running an executable
39 // from a shell, e.g. when using 'adb shell'. For regular
40 // applications, stderr is redirected to /dev/null by default.
41 fprintf(stderr, "PANIC:GAbi++:%s\n", message);
42
43 // Always print the message to the log, when possible. Use
44 // dlopen()/dlsym() to avoid adding an explicit dependency
45 // to -llog in GAbi++ for this sole feature.
46 //
47 // An explicit dependency to -ldl can be avoided because these
48 // functions are implemented directly by the dynamic linker.
49 // That is, except when this code is linked into a static
50 // executable. In this case, adding -ldl to the final link command
51 // will be necessary, but the dlopen() will always return NULL.
52 //
53 // There is unfortunately no way to detect where this code is going
54 // to be used at compile time, but static executables are strongly
55 // discouraged on the platform because they can't implement ASLR.
56 //
57 typedef void (*logfunc_t)(int, const char*, const char*);
58 logfunc_t logger = NULL;
59
60 // Note that this should always succeed in a regular application,
61 // because the library is already loaded into the process' address
62 // space by Zygote before forking the application process.
63 // This will fail in static executables, because the static
64 // version of -ldl only contains empty stubs.
65 void* liblog = dlopen("liblog.so", RTLD_NOW);
66
67 if (liblog != NULL) {
68 logger = reinterpret_cast<logfunc_t>(dlsym(liblog, "__android_log_print"));
69 if (logger != NULL) {
70 (*logger)(ANDROID_LOG_FATAL, "GAbi++", message);
71 }
72 dlclose(liblog);
73 }
74
75 std::terminate();
76 }
77
78 } // namespace __gabixx
79