RE: [patch] x86_64 specific function return probes

["Lynch, Rusty" <rusty.lynch@intel.com>]

From: Andi Kleen [mailto:ak@suse.de]
>On Thu, Jun 02, 2005 at 09:09:09AM -0700, Rusty Lynch wrote:
>> The following patch adds the x86_64 architecture specific
implementation
>> for function return probes to the 2.6.12-rc5-mm2 kernel.
>
>This is not a sufficient description for a patch. Can you describe
>how it actually works and what it does?
>

Ok, let me write up a description and I'll repost.

>> + * Called when we hit the probe point at kretprobe_trampoline
>> + */
>> +int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
>> +{
>> +	struct task_struct *tsk;
>> +	struct kretprobe_instance *ri;
>> +	struct hlist_head *head;
>> +	struct hlist_node *node;
>> +	unsigned long *sara = (unsigned long *)regs->rsp - 1;
>> +
>> +	tsk = arch_get_kprobe_task(sara);
>
>I dont think you handle the case of the exception happening on
>a exception or interrupt stack. This is broken.
>
>-Andi
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