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SubjectRe: [REGRESSION][PATCH V4 3/3] bpf jit: Let the powerpc jit handle negative offsets
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From: Jan Seiffert <kaffeemonster@googlemail.com>
Date: Fri, 30 Mar 2012 17:35:01 +0200

> Now the helper function from filter.c for negative offsets is exported,
> it can be used it in the jit to handle negative offsets.
>
> First modify the asm load helper functions to handle:
> - know positive offsets
> - know negative offsets
> - any offset
>
> then the compiler can be modified to explicitly use these helper
> when appropriate.
>
> This fixes the case of a negative X register and allows to lift
> the restriction that bpf programs with negative offsets can't
> be jited.
>
> Signed-off-by: Jan Seiffert <kaffeemonster@googlemail.com>
>
> I have only compile tested this, -ENOHARDWARE.
> Can someone with more powerpc kung-fu review and maybe test this?
> Esp. powerpc asm is not my strong point. I think i botched the
> stack frame in the call setup. Help?

I'm not applying this until a powerpc person tests it.

Also, we have an ARM JIT in the tree which probably needs to
be fixed similarly.


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