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powerpc/64s: SLB miss already has CTR saved for relocatable kernel

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The EXCEPTION_PROLOG_1 used by SLB miss already saves CTR when the
kernel is built with CONFIG_RELOCATABLE. So it does not have to be
saved and reloaded when branching to slb_miss_realmode. It can be
restored from the PACA as usual.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-05-21 23:15:44 +10:00 committed by Michael Ellerman
parent 7c28f04828
commit fe5482c043
1 changed files with 1 additions and 8 deletions
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9
arch/powerpc/kernel/exceptions-64s.S
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@ -522,7 +522,6 @@ EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)
* because the distance from here to there depends on where
* the kernel ends up being put.
*/
mfctr r11
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
@ -545,7 +544,6 @@ EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
* because the distance from here to there depends on where
* the kernel ends up being put.
*/
mfctr r11
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
@ -585,7 +583,6 @@ EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80)
#ifndef CONFIG_RELOCATABLE
b slb_miss_realmode
#else
mfctr r11
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
@ -603,7 +600,6 @@ EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
#ifndef CONFIG_RELOCATABLE
b slb_miss_realmode
#else
mfctr r11
LOAD_HANDLER(r10, slb_miss_realmode)
mtctr r10
bctr
@ -625,10 +621,6 @@ EXC_COMMON_BEGIN(slb_miss_realmode)
* procedure.
*/
mflr r10
#ifdef CONFIG_RELOCATABLE
mtctr r11
#endif
stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
@ -657,6 +649,7 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
.machine pop
RESTORE_CTR(r9, PACA_EXSLB)
RESTORE_PPR_PACA(PACA_EXSLB, r9)
ld r3,PACA_EXSLB+EX_R3(r13)
ld r9,PACA_EXSLB+EX_R9(r13)