Re: Step-by-step instructions for debugging Cisco IOS using gdb

["Andy Davis" <iosftpexploit () googlemail com>]

lol - if you check the FD archives you'll see that I led the research
project at IRM that Gyan and Varun participated in

Thanks for gdb info - I wasn't aware of that

Andy

On Fri, Aug 15, 2008 at 7:20 PM, Smiler S <smiler808 () googlemail com> wrote:
> From: Andy Davis <iosftpexploit_at_googlemail.com>
> Date: Tue, 12 Aug 2008 22:01:37 +0100
>
> > Congratulations you are now debugging IOS ;-)
>
> > One unusual feature, which I have yet to explain is that when the
> > registers are displayed they are all offset by 1 e.g:
>
> If a vector variable is stored in a register, gcc writes debug information
> telling gdb which register the variable is stored in. This mapping is
> changed between gcc2 & gcc3. Since there isn't anything in the debug output
> to distinguish code compiled by gcc3 from code compiled by gcc2, there is no
> way for gdb to know the right map. gdb supports the gcc3 map.
>
> If vector code is compiled by gcc2 as in the case of IOS, then the register
> assignment will be off by 1.
>
> PS  - Stop ripping Gyan and Varuns IOS research work you jackass cause you
> ain't getting no fame with that bullshit :P :P :P

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