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Commit c45aea27 authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
Browse files

tracehook: tracehook_signal_handler 



This defines tracehook_signal_handler() as a hook for the arch signal
handling code to call.  It gives ptrace the opportunity to stop for a
pseudo-single-step trap immediately after signal handler setup is done.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fa8e26cc

include/linux/tracehook.h

+23 −0
Original line number Diff line number Diff line
@@ -289,4 +289,27 @@ static inline void tracehook_finish_release_task(struct task_struct *task) 
	ptrace_release_task(task);

}



/**

 * tracehook_signal_handler - signal handler setup is complete

 * @sig:		number of signal being delivered

 * @info:		siginfo_t of signal being delivered

 * @ka:			sigaction setting that chose the handler

 * @regs:		user register state

 * @stepping:		nonzero if debugger single-step or block-step in use

 *

 * Called by the arch code after a signal handler has been set up.

 * Register and stack state reflects the user handler about to run.

 * Signal mask changes have already been made.

 *

 * Called without locks, shortly before returning to user mode

 * (or handling more signals).

 */

static inline void tracehook_signal_handler(int sig, siginfo_t *info,

					    const struct k_sigaction *ka,

					    struct pt_regs *regs, int stepping)

{

	if (stepping)

		ptrace_notify(SIGTRAP);

}



#endif	/* <linux/tracehook.h> */