On Wed, 6 Nov 2013 19:24:08 +0100, Oleg Nesterov wrote:
> Forgot to mention,
>
> On 11/06, Oleg Nesterov wrote:
>>
>> I meant,
>>
>> saved_ip = instruction_pointer(regs);
>>
>> // pass the "ip" which was used to calculate
>> // the @addr argument to fetch_*() methods
>>
>> temp_ip = is_ret_probe(tu) ? func : saved_ip;
>> temp_ip -= tu->offset;
>> instruction_pointer_set(temp_ip);
>>
>> store_trace_args(...);
>
> Note that instruction_pointer_set() is not really nice in any case,
> this can obviously confuse FETCH_MTD_reg("ip").
Yes.
>
> But lets ignore this. The solution is simple, we can pass/use this
> info via current->utask. We can either add the new member, or add
> a union. Or simply reuse xol_vaddr. Doesn't matter.
Okay, I'll take a look.
>
> So the only question is should we rely on instruction_pointer/func
> to translate the address or we should do something else (say, vma).
>
> So far I like this approach.
Me too. :)
So, I'll wait for more feedbacks from others and then send a new
version. Actually I don't have much to do this these days - probably
until next week (there'll be the KLF). Please forgive my brevity in
replies.
I'll be back with a new patchset then. :)
Thanks,
Namhyung
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