#include "syscall.h"
#include "pthread_impl.h"
#include "atomic.h"
+#include "lock.h"
+#include "ksigaction.h"
+
+hidden volatile int __abort_lock[1];
_Noreturn void abort(void)
{
raise(SIGABRT);
+
+ /* If there was a SIGABRT handler installed and it returned, or if
+ * SIGABRT was blocked or ignored, take an AS-safe lock to prevent
+ * sigaction from installing a new SIGABRT handler, uninstall any
+ * handler that may be present, and re-raise the signal to generate
+ * the default action of abnormal termination. */
__block_all_sigs(0);
+ LOCK(__abort_lock);
+ __syscall(SYS_rt_sigaction, SIGABRT,
+ &(struct k_sigaction){.handler = SIG_DFL}, 0, _NSIG/8);
+ __syscall(SYS_tkill, __pthread_self()->tid, SIGABRT);
+ __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
+ &(long[_NSIG/(8*sizeof(long))]){1UL<<(SIGABRT-1)}, 0, _NSIG/8);
+
+ /* Beyond this point should be unreachable. */
a_crash();
raise(SIGKILL);
_Exit(127);