From 0f95b7fc839bc3272b1bf2325d8748a649bd3534 Mon Sep 17 00:00:00 2001 From: Ananth N Mavinakayanahalli Date: Tue, 8 May 2007 00:28:27 -0700 Subject: Kprobes: print details of kretprobe on assertion failure In certain cases like when the real return address can't be found or when the number of tracked calls to a kretprobed function is less than the number of returns, we may not be able to find the correct return address after processing a kretprobe. Currently we just do a BUG_ON, but no information is provided about the actual failing kretprobe. Print out details of the kretprobe before calling BUG(). Signed-off-by: Ananth N Mavinakayanahalli Cc: Prasanna S Panchamukhi Cc: Jim Keniston Cc: Anil S Keshavamurthy Cc: Maneesh Soni Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/kprobes.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux/kprobes.h') diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index f2646070037..850ee871e35 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -157,6 +157,16 @@ struct kretprobe_instance { struct task_struct *task; }; +static inline void kretprobe_assert(struct kretprobe_instance *ri, + unsigned long orig_ret_address, unsigned long trampoline_address) +{ + if (!orig_ret_address || (orig_ret_address == trampoline_address)) { + printk("kretprobe BUG!: Processing kretprobe %p @ %p\n", + ri->rp, ri->rp->kp.addr); + BUG(); + } +} + extern spinlock_t kretprobe_lock; extern struct mutex kprobe_mutex; extern int arch_prepare_kprobe(struct kprobe *p); -- cgit v1.2.2