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kprobes: kretprobe user entry-handler

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Provide support to add an optional user defined callback to be run at
function entry of a kretprobe'd function.  Also modify the kprobe smoke
tests to include an entry-handler during the kretprobe sanity test.

Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Acked-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Abhishek Sagar 2008-02-06 01:38:22 -08:00 • committed by Linus Torvalds
parent 5beec4aa2a
commit f47cd9b553
4 changed files with 94 additions and 15 deletions
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3
include/linux/kprobes.h
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@ -152,8 +152,10 @@ static inline int arch_trampoline_kprobe(struct kprobe *p)
struct kretprobe {
struct kprobe kp;
kretprobe_handler_t handler;
kretprobe_handler_t entry_handler;
int maxactive;
int nmissed;
size_t data_size;
struct hlist_head free_instances;
struct hlist_head used_instances;
};
@ -164,6 +166,7 @@ struct kretprobe_instance {
struct kretprobe *rp;
kprobe_opcode_t *ret_addr;
struct task_struct *task;
char data[0];
};
struct kretprobe_blackpoint {