Add an kinfo sysctl to retrieve signal trampoline location for the

given process.

Note that the correctness of the trampoline length returned for ABIs
which do not use shared page depends on the correctness of the struct
sysvec sv_szsigcodebase member, which will be fixed on as-need basis.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/sys/user.h b/sys/sys/user.h
index d2e2b6e71284..e926fe871c95 100644
--- a/sys/sys/user.h
+++ b/sys/sys/user.h
@@ -498,6 +498,12 @@ struct kinfo_kstack {
 	int	 _kkst_ispare[16];		/* Space for more stuff. */
 };
 
+struct kinfo_sigtramp {
+	void	*ksigtramp_start;
+	void	*ksigtramp_end;
+	void	*ksigtramp_spare[4];
+};
+
 #ifdef _KERNEL
 /* Flags for kern_proc_out function. */
 #define KERN_PROC_NOTHREADS	0x1