(though if support for them is ever put in here, they should be,
   but for i486-en only...

I don't follow your logic there.  My 386 certainly thinks it knows about
FS and GS, and theoretically we should be making them as accessible as
any other registers.  Now it's true that we don't really use them for any
`normal' applications, but that's not an adequate answer; who the Hell
knows what, e.g., WINE programs might do, and there's no documentation
that says their use is forbidden.


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