On Thu, 2015-04-02 at 16:50 +0100, Ian Campbell wrote:

> Writing to the bottom half (e.g. w0) of a register implicitly clears the
> top half, IIRC, so I think a kernel is unlikely to want to do this, even
> if it could (which I'm not quite convinced of).

That said, I'll see if I can make something work with the handle_*
taking the reg number instead of a pointer and calling select_user_reg
in each.

Ian.



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