Re: [CFT] ELF Relocatable x86 and x86_64 bzImages

From: Andi Kleen
Date: Tue Aug 08 2006 - 19:34:28 EST

Don Zickus <dzickus@xxxxxxxxxx> writes:
> >
> > Odd. I wonder if I'm missing a serializing instruction somewhere,
> > to ensure the effects of ``self modifying code'' aren't a problem.
> > As I read Intels Documentation if you have a jump before you get
> > to the code there shouldn't be a problem.
> >
> > Still that doesn't really explain bytes_out.
> >

Sounds nasty.

> So I narrowed down the problem but it isn't obvious to me why this problem
> exists. Basically, even though bytes_out is supposed to be initialized to
> 0, it becomes -1 before entering decompress_kernel(). Of course, the
> fallout is in flush_window() bytes_out wounds up being one less than
> outcnt and hence my original problem.
> Any thoughts on how to debug where this could be getting corrupted?

Use a simulator (hopefully you can reproduce it in there) like qemu
or AMD SimNow and set a watch point on the address?

Or try to find someone who has a Intel target probe to help you out.

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