static ssize_t coffeecatch_backtrace_signal(siginfo_t* si, void* sc,
backtrace_frame_t* frames,
size_t ignore_depth,
size_t max_depth) {
void *const libcorkscrew = dlopen("libcorkscrew.so", RTLD_LAZY | RTLD_LOCAL);
if (libcorkscrew != NULL) {
t_unwind_backtrace_signal_arch unwind_backtrace_signal_arch
= (t_unwind_backtrace_signal_arch)
dlsym(libcorkscrew, "unwind_backtrace_signal_arch");
t_acquire_my_map_info_list acquire_my_map_info_list
= (t_acquire_my_map_info_list)
dlsym(libcorkscrew, "acquire_my_map_info_list");
t_release_my_map_info_list release_my_map_info_list
= (t_release_my_map_info_list)
dlsym(libcorkscrew, "release_my_map_info_list");
if (unwind_backtrace_signal_arch != NULL
&& acquire_my_map_info_list != NULL
&& release_my_map_info_list != NULL) {
map_info_t*const info = acquire_my_map_info_list();
const ssize_t size =
unwind_backtrace_signal_arch(si, sc, info, frames, ignore_depth,
max_depth);
release_my_map_info_list(info);
return size;
} else {
DEBUG(print("symbols not founs in libcorkscrew.so\n"));
}
dlclose(libcorkscrew);
} else {
DEBUG(print("libcorkscrew.so could not be loaded\n"));
}
return -1;
}
static void unwind_backtrace_thread_signal_handler(int n __attribute__((unused)), siginfo_t* siginfo, void* sigcontext) {
if (!android_atomic_acquire_cas(gettid(), STATE_DUMPING, &g_unwind_signal_state.tid_state)) {
g_unwind_signal_state.returned_frames = unwind_backtrace_signal_arch(
siginfo, sigcontext,
g_unwind_signal_state.map_info_list,
g_unwind_signal_state.backtrace,
g_unwind_signal_state.ignore_depth,
g_unwind_signal_state.max_depth);
android_atomic_release_store(STATE_DONE, &g_unwind_signal_state.tid_state);
} else {
ALOGV("Received spurious SIGURG on thread %d that was intended for thread %d.",
gettid(), android_atomic_acquire_load(&g_unwind_signal_state.tid_state));
}
}
static char *
mono_extension_handle_native_sigsegv_libcorkscrew (void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
{
#if defined (__arm__) || defined (__i386__)
char *dl_err;
get_backtrace_symbols_t get_backtrace_symbols;
free_backtrace_symbols_t free_backtrace_symbols;
unwind_backtrace_signal_arch_t unwind_backtrace_signal_arch;
acquire_my_map_info_list_t acquire_my_map_info_list;
release_my_map_info_list_t release_my_map_info_list;
backtrace_frame_t frames [FRAMES_TO_UNWIND];
backtrace_symbol_t symbols [FRAMES_TO_UNWIND];
map_info_t *map_info;
ssize_t frames_unwound;
size_t i;
MonoDl *dl = mono_dl_open ("libcorkscrew.so", MONO_DL_LAZY, &dl_err);
if (!dl)
return dl_err;
LOAD_SYM (dl, dl_err, get_backtrace_symbols, get_backtrace_symbols);
LOAD_SYM (dl, dl_err, free_backtrace_symbols, free_backtrace_symbols);
LOAD_SYM (dl, dl_err, unwind_backtrace_signal_arch, unwind_backtrace_signal_arch);
LOAD_SYM (dl, dl_err, acquire_my_map_info_list, acquire_my_map_info_list);
LOAD_SYM (dl, dl_err, release_my_map_info_list, release_my_map_info_list);
map_info = acquire_my_map_info_list ();
frames_unwound = unwind_backtrace_signal_arch (info, ctx, map_info, frames, 0, FRAMES_TO_UNWIND);
release_my_map_info_list (map_info);
if (frames_unwound == -1) {
mono_dl_close (dl);
return g_strdup ("unwind_backtrace_signal_arch () returned -1");
}
get_backtrace_symbols (frames, frames_unwound, symbols);
for (i = 0; i < frames_unwound; i++) {
backtrace_frame_t *frame = frames + i;
backtrace_symbol_t *symbol = symbols + i;
const char *name = symbol->demangled_name ? symbol->demangled_name : (symbol->symbol_name ? symbol->symbol_name : "???");
uintptr_t off = symbol->relative_pc - symbol->relative_symbol_addr;
uintptr_t ip = frame->absolute_pc;
mono_runtime_printf_err (" at %s+%zu [0x%zx]", name, off, ip);
}
free_backtrace_symbols (symbols, frames_unwound);
mono_dl_close (dl);
return NULL;
#else
return g_strdup ("libcorkscrew is only supported on 32-bit ARM/x86");
#endif
}