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Date: Sat, 19 Sep 2009 21:44:08 -0400
Message-ID: <bc2d970909191844l6c61ba18hbdac20edad5be94e@mail.gmail.com>
From: Ryan Stone <rysto32@gmail.com>
To: Barney Cordoba <barney_cordoba@yahoo.com>
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Cc: freebsd-current@freebsd.org, Ivan Voras <ivoras@freebsd.org>
Subject: Re: SSE register return with SSE disabled on AMD64
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You must not use SSE or floating point operations in the kernel.  The
state of the floating point and SSE registers is *not* saved upon
entry to the kernel.  If the kernel executes SSE or floating point
instructions it will corrupt the state of a userland program.

Ryan Stone