RE: UP2000 crashes -- update

["Greg Lindahl" <glindahl hpti com>]

> > Basically, setup_sigcontext is getting a pointer with illegal alignment.
>
> Impossible.
>
>         return (void *)((sp - frame_size) & -32ul);

It's worth noting that it should be impossible to get an exception during
setup_sigcontext anyway:

        frame = get_sigframe(ka, oldsp, sizeof(*frame));
        if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
                goto give_sigsegv;

        err |= setup_sigcontext(&frame->sc, regs, sw, set->sig[0], oldsp);

Yet I do.