Hi Elad...
On Fri, Jul 25, 2008 at 4:03 AM, Elad Lahav
<elad_lahav@xxxxxxxxxxxxxxxxxxxxx> wrote:
> I am trying to determine, in run-time, the where a function was called from.
> I believe that the standard way of doing this on an x86 is by looking at the
> top of the stack pointed to by the EBP register. I.e., the following code
> should yield the return address in 'addr':
>
> asm volatile("movl 0x4(%%ebp), %0\n" : "=r"(addr));
I think that's correct... parameters are pushed first, then ret addr.
So the closest with %ebp should be ret addr AFAIK.
> However, looking at the assembly code of the function I'm interested in
> (update_process_times), the calling convention looks odd: EBP is not pushed,
> and RET is not invoked at the end. I assume this has something to do with
> the function being called in interrupt context?
Are you sure? Looking at
http://lxr.linux.no/linux/kernel/time/tick-common.c#L70, you can see
that update_process_times() seems being called normally. So I guess
you should see "call" and "ret" when checking the assembly codes
regards,
Mulyadi.
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