Re: [User-mode-linux-devel] UML/PPC status

[Chris E. <cem...@ch...>]

On Wed, 3 May 2000, Jeff Dike wrote:

> I think I mentioned in one of my various pieces of mail that I'm
> going to change it to UM_EXEC_INIT(pid) (I just made up the name
> right now though...).

Ok, fine.

> > Incidentally, it looks like the current system I have is falling
> > over inside padzero() from the elf loading stuff.  I suppose that
> > means the bss hasn't been mapped properly.
> 
> That's supposed to get a segfault.  The fault handler is supposed to
> map in the page properly.

Hmm...  I'll have to have a closer look.  At the moment all that I see
is a zombie process.  It'd be nice if the kernel shut down when init
dies - I've been running 'killall -KILL linux' a lot recently.  I may
have missed something obvious, of course.

Incidentally, have you got gdb usefully debugging this sort of thing?
I haven't had all that much luck, presumably due either to the funky
remapping or the multiple threads.

> When you exec, there are going to be three segfaults before the
> process actually gets going - the stack, padzero filling out bss,
> and the entry point.  So the segfault handler is going to map those
> three pages in before anything else happens.

Is padzero the first one to happen?  If not, it's possibly even
stranger.

Chris
-- 
Chris Emerson, obsessed Cambridge juggler
E-mail: cem...@ch...
Web page: http://www.chiark.greenend.org.uk/~cemerson/