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tracehook: tracehook_signal_handler

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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: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath 2008-07-25 19:45:50 -07:00 committed by Linus Torvalds
parent fa8e26ccd4
commit c45aea2761
1 changed files with 23 additions and 0 deletions
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23
include/linux/tracehook.h
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@ -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> */