On Sun, 2013-06-02 at 12:21 -0400, John David Anglin wrote: > The comment at the start of pacache.S states that the base and index > registers used for > fdc,fic, and pdc instructions should not use shadowed registers. > Although this is probably > unnecessary for tmpalias flushes, there is also no reason not to > comply. The same > index register (%r23) is used as in other routines. Please don't do this, it's a misinterpretation of the comment. What the comment is trying to say is that we use unshadowed registers to pass information to the tmpalias handler in our tlb insertion interruption. It's the do_alias macro in entry.S. The only actual unshadowed registers it uses are %r23 and %r26. Apart from these having to have specific values, the rest of the routine is free to use any other registers (either shadowed or unshadowed) as it sees fit. If the comment is unclear, perhaps it needs fixing? James -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
