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MIPS: OCTEON: Fix FP context save.

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It wasn't being saved on task switch.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8934/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2015-01-15 16:11:06 +03:00 committed by Ralf Baechle
parent ac655fb762
commit d6e41525e3
1 changed files with 7 additions and 12 deletions
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19
arch/mips/kernel/octeon_switch.S
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@ -31,15 +31,11 @@
/*
* check if we need to save FPU registers
*/
PTR_L t3, TASK_THREAD_INFO(a0)
LONG_L t0, TI_FLAGS(t3)
li t1, _TIF_USEDFPU
and t2, t0, t1
beqz t2, 1f
nor t1, zero, t1
and t0, t0, t1
LONG_S t0, TI_FLAGS(t3)
.set push
.set noreorder
beqz a3, 1f
PTR_L t3, TASK_THREAD_INFO(a0)
.set pop
/*
* clear saved user stack CU1 bit
@ -57,14 +53,13 @@
1:
/* check if we need to save COP2 registers */
PTR_L t2, TASK_THREAD_INFO(a0)
LONG_L t0, ST_OFF(t2)
LONG_L t0, ST_OFF(t3)
bbit0 t0, 30, 1f
/* Disable COP2 in the stored process state */
li t1, ST0_CU2
xor t0, t1
LONG_S t0, ST_OFF(t2)
LONG_S t0, ST_OFF(t3)
/* Enable COP2 so we can save it */
mfc0 t0, CP0_STATUS