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SubjectRe: kgdb support in vanilla 2.6.2
Hi!

> > need to take a look at such things and really convice ourselves that
> > they're worthwhile. Personally, I'd only be interested in the basic stub.
>
> What I found always extremly ugly in the i386 stub was that it uses
> magic globals to talk to the page fault handler. For the x86-64
> version I replaced that by just using __get/__put_user in the memory
> accesses, which is much cleaner. I would suggest doing that for i386
> too.
>
> Also what's also ugly in i386 is that it uses ugly hooks in traps.c/fault.c.
> On x86-64 I instead added generic notifiers (see include/asm-x86_64/die.h
> and notify_die in arch/x86_64/kernel/traps.c)
> where both kdb and kgdb and possibly dprobes and other debuggers can hook
> in without conflicting patches for the same files from everybody.
> I would strongly suggest to adopt such a generic framework for i386 too
> to clean up the core kernel <-> debugger interaction. As soon as this
> frame work is in just dropping the stub is is very clean.
>
> The x86-64 version should be pretty simple to port to i386 if someone
> is interested ...

Hmm, this tells me that perhaps it is reasonable to get amd64 version
in first, since it received lot of cleaning already...
Pavel
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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