Re: kgdb for mainline kernel: core-lite [patch 1/3]

[Tom Rini <trini@kernel.crashing.org>]

On Mon, Mar 08, 2004 at 05:57:26PM +0100, Andi Kleen wrote:
> Tom Rini <trini@kernel.crashing.org> writes:
> >
> > Here's where what Andi said about being able to get the pt_regs stuff
> > off the stack (I think that's what he said at least) started to confuse
> > me slightly.  But if I understand it right (and I never got around to
> > testing this) we can replace the do_schedule() stuffs at least with
> > something like kgdb_get_pt_regs(), since (and I lost my notes on this,
> > so it's probably not quite right) (thread_info->esp0)-1
> 
> No, that's the user space registers.
> 
> You don't need these registers really as long as you have the 
> correct dwarf2 CFI description of all the code involved. gdb
> is then able to reconstruct them using the C stack by itself.
> 
> All it needs for that is esp and eip.

Ah, OK.  Amit, how about for the expanded T-packet thing, we do what you
suggested, except call it kgdb_arch_extra_regs() and let the arch fill
out whatever regs it needs to.  ESP/EIP for x86_64/i386, PC/SP for
ppc32, etc, etc?

-- 
Tom Rini
http://gate.crashing.org/~trini/