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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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