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    Subject[PATCH 10/23] tracehook: tracehook_signal_handler
    Date
    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>
    ---
    include/linux/tracehook.h | 23 +++++++++++++++++++++++
    1 files changed, 23 insertions(+), 0 deletions(-)

    diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
    index e113e09..2d1426f 100644
    --- a/include/linux/tracehook.h
    +++ b/include/linux/tracehook.h
    @@ -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> */

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