Warner Losh c8719df5f9 Add a comment about why at is turned off in the exception handler.
Only k0 and k1 may be touched until we save registers somewhere.

MFC After: 2 days
2016-01-26 18:39:23 +00:00
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2013-10-31 02:27:16 +00:00
2015-12-25 14:51:36 +00:00
2013-02-26 01:00:11 +00:00