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powerpc/8xx: Handle CR out of exception PROLOG/EPILOG

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In order to be able to reduce scope during which CR is saved, we take
CR saving/restoring out of exception PROLOG and EPILOG

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
LEROY Christophe 2015-04-20 07:54:40 +02:00 committed by Scott Wood
parent 90883a8255
commit d5fd9d7d66
1 changed files with 7 additions and 3 deletions
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10
arch/powerpc/kernel/head_8xx.S
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@ -116,13 +116,13 @@ turn_on_mmu:
*/
#define EXCEPTION_PROLOG \
EXCEPTION_PROLOG_0; \
mfcr r10; \
EXCEPTION_PROLOG_1; \
EXCEPTION_PROLOG_2
#define EXCEPTION_PROLOG_0 \
mtspr SPRN_SPRG_SCRATCH0,r10; \
mtspr SPRN_SPRG_SCRATCH1,r11; \
mfcr r10
mtspr SPRN_SPRG_SCRATCH1,r11
#define EXCEPTION_PROLOG_1 \
mfspr r11,SPRN_SRR1; /* check whether user or kernel */ \
@ -162,7 +162,6 @@ turn_on_mmu:
* Exception exit code.
*/
#define EXCEPTION_EPILOG_0 \
mtcr r10; \
mfspr r10,SPRN_SPRG_SCRATCH0; \
mfspr r11,SPRN_SPRG_SCRATCH1
@ -313,6 +312,7 @@ InstructionTLBMiss:
mtspr SPRN_DAR, r3
#endif
EXCEPTION_PROLOG_0
mfcr r10
mtspr SPRN_SPRG_SCRATCH2, r10
mfspr r10, SPRN_SRR0 /* Get effective address of fault */
INVALIDATE_ADJACENT_PAGES_CPU15(r11, r10)
@ -363,6 +363,7 @@ InstructionTLBMiss:
mtspr SPRN_DAR, r11 /* Tag DAR */
#endif
mfspr r10, SPRN_SPRG_SCRATCH2
mtcr r10
EXCEPTION_EPILOG_0
rfi
@ -372,6 +373,7 @@ DataStoreTLBMiss:
mtspr SPRN_DAR, r3
#endif
EXCEPTION_PROLOG_0
mfcr r10
mtspr SPRN_SPRG_SCRATCH2, r10
mfspr r10, SPRN_MD_EPN
@ -437,6 +439,7 @@ DataStoreTLBMiss:
#endif
mtspr SPRN_DAR, r11 /* Tag DAR */
mfspr r10, SPRN_SPRG_SCRATCH2
mtcr r10
EXCEPTION_EPILOG_0
rfi
@ -462,6 +465,7 @@ InstructionTLBError:
. = 0x1400
DataTLBError:
EXCEPTION_PROLOG_0
mfcr r10
mfspr r11, SPRN_DAR
cmpwi cr0, r11, RPN_PATTERN