From: David S. Miller <davem@davemloft.net>
Date: Fri, 25 May 2012 07:31:56 +0000 (-0700)
Subject: sparc64: Fix several bugs in quad floating point emulation.
X-Git-Tag: v3.5-rc1~34^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=456d3d42460c1fc20ba0d27442443fcd63aaac35;p=pandora-kernel.git

sparc64: Fix several bugs in quad floating point emulation.

UltraSPARC-T2 and later do not use the fp_exception_other trap and do
not set the floating point trap type field in the %fsr at all when you
try to execute an unimplemented FPU operation.

Instead, it uses the illegal_instruction trap and it leaves the
floating point trap type field clear.

So we should not validate the %fsr trap type field when do_mathemu()
is invoked from the illegal instruction handler.

Also, the floating point trap type field is 3 bits, not 4 bits.

Signed-off-by: David S. Miller <davem@davemloft.net>
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