Commit Graph

4 Commits

Author SHA1 Message Date
Paul Mundt
138bed154e sh: Fix TIF_USEDFPU clearing under FPU emulation.
The unlazy_fpu() path calls in to save_fpu() if the task has
TIF_USEDFPU set. save_fpu() being the crap API that it is has the side
effect of clearing the flag itself, which presently doesn't happen
if we're using FPU emulation. Fix this up for now, pending an overhaul
in 2.6.26.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-03-26 19:09:21 +09:00
Paul Mundt
9bbafce2ee sh: Fix occasional FPU register corruption under preempt.
Presently with preempt enabled there's the possibility to be preempted
after the TIF_USEDFPU test and the register save, leading to bogus
state post-__switch_to(). Use an explicit preempt_disable()/enable()
pair around unlazy_fpu()/clear_fpu() to avoid this. Follows the x86
change.

Reported-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-03-26 19:02:47 +09:00
Paul Mundt
74d99a5e26 sh: SH-2A FPU support.
Signed-off-by: Kieran Bingham <kbingham@mpc-data.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-01-28 13:18:57 +09:00
Paul Mundt
332fd57b92 sh: Bring the SH-5 FPU in line with the SH-4 FPU API.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2008-01-28 13:18:55 +09:00