Re: kgdb on arm for 2.6

Lance Spaulding wrote:
> Amit Kale wrote:
>
> > arm processor doesn't contain hardware support for single step. gdb is 
> > aware of this and uses breakpoints for this purpose. It sends an 's' 
> > packet, which if failed tells gdb that stub doesn't support single 
> > stepping. Gdb uses breakpoints after that.
This is interesting in that our 2.4 kernels contain kgdb with step code.  the 
code there decodes the instruction and does what is needed to do the step. 
Not a small feat, but then thats the way it was done prior to the hardware step.

George
--

> > -Amit
> >  
> How do I get gdb to do this?  When I try to single-step I get the 
> "invalid reply" message then gdb is basically hung.  I'm using gdb 
> v6.1.  Also for reference, single-stepping works fine on the same 
> platform using a old (~ 2 years) version of kgdb and a 2.4 kernel.  It's 
> just the new 2.6 version of kgdb that I can't get working right.
>
> Thanks in advance,
> Lance
>
>
>
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--
George Anzinger   george@xxxxxxxxxx
HRT (High-res-timers):  http://sourceforge.net/projects/high-res-timers/


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