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/* $OpenBSD: abort.c,v 1.14 2005/08/08 08:05:36 espie Exp $ */
/*
* Copyright (c) 1985 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "thread_private.h"
#include "atexit.h"
/* temporary, for bug hunting */
#include "logd.h"
#define debug_log(format, ...) \
__libc_android_log_print(ANDROID_LOG_DEBUG, "libc-abort", (format), ##__VA_ARGS__ )
#ifdef __arm__
void
__libc_android_abort(void)
#else
void
abort(void)
#endif
{
struct atexit *p = __atexit;
static int cleanup_called = 0;
sigset_t mask;
sigfillset(&mask);
/*
* don't block SIGABRT to give any handler a chance; we ignore
* any errors -- X311J doesn't allow abort to return anyway.
*/
sigdelset(&mask, SIGABRT);
/* temporary, so deliberate seg fault can be caught by debuggerd */
sigdelset(&mask, SIGSEGV);
/* -- */
(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
/*
* POSIX requires we flush stdio buffers on abort
*/
if (cleanup_called == 0) {
while (p != NULL && p->next != NULL)
p = p->next;
/* the check for fn_dso == NULL is mostly paranoia */
if (p != NULL && p->fns[0].fn_dso == NULL &&
p->fns[0].fn_ptr.std_func != NULL) {
cleanup_called = 1;
(*p->fns[0].fn_ptr.std_func)();
}
}
/* temporary, for bug hunting */
/* seg fault seems to produce better debuggerd results than SIGABRT */
*((char*)0xdeadbaad) = 39;
/* -- */
(void)kill(getpid(), SIGABRT);
/*
* if SIGABRT ignored, or caught and the handler returns, do
* it again, only harder.
*/
{
struct sigaction sa;
sa.sa_handler = SIG_DFL;
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
(void)sigaction( SIGABRT, &sa, &sa );
}
(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
(void)kill(getpid(), SIGABRT);
_exit(1);
}
#ifdef __arm__
/*
* abort() does not return, which gcc interprets to mean that it doesn't
* need to preserve any of the callee-save registers. Unfortunately this
* includes the link register, so if LR is used there is no way to determine
* which function called abort().
*
* We work around this by inserting a trivial stub that doesn't alter
* any of the "interesting" registers and thus doesn't need to save them.
* We can't just call __libc_android_abort from C because gcc uses "bl"
* without first saving LR, so we use an asm statement. This also has
* the side-effect of replacing abort() with __libc_android_abort() in
* the stack trace.
*
* Ideally __libc_android_abort would be static, but I haven't figured out
* how to tell gcc to call a static function from an asm statement.
*/
void
abort(void)
{
asm ("b __libc_android_abort");
_exit(1); /* suppress gcc noreturn warnings */
}
#endif
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