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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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16
kernel/test_kprobes.c
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@@ -135,6 +135,12 @@ static int test_jprobe(void)
#ifdef CONFIG_KRETPROBES
static u32 krph_val;
static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
krph_val = (rand1 / div_factor);
return 0;
}
static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
unsigned long ret = regs_return_value(regs);
@@ -144,13 +150,19 @@ static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
printk(KERN_ERR "Kprobe smoke test failed: "
"incorrect value in kretprobe handler\n");
}
if (krph_val == 0) {
handler_errors++;
printk(KERN_ERR "Kprobe smoke test failed: "
"call to kretprobe entry handler failed\n");
}
krph_val = (rand1 / div_factor);
krph_val = rand1;
return 0;
}
static struct kretprobe rp = {
.handler = return_handler,
.entry_handler = entry_handler,
.kp.symbol_name = "kprobe_target"
};
@@ -167,7 +179,7 @@ static int test_kretprobe(void)
ret = kprobe_target(rand1);
unregister_kretprobe(&rp);
if (krph_val == 0) {
if (krph_val != rand1) {
printk(KERN_ERR "Kprobe smoke test failed: "
"kretprobe handler not called\n");
handler_errors++;