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    SubjectRe: [REGRESSION][PATCH V4 3/3] bpf jit: Let the powerpc jit handle negative offsets
    From: Jan Seiffert <>
    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 <>
    > 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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