The EX_DAR save area is only used in exceptional cases. With r3 no
longer clobbered by slb_allocate_realmode, saving faulting address to
EX_DAR can be deferred to those cases.
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
arch/powerpc/kernel/exceptions-64s.S | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/kernel/exceptions-64s.S
b/arch/powerpc/kernel/exceptions-64s.S
index ae418b85c17c..a4a71bce35d6 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -628,7 +628,6 @@ EXC_COMMON_BEGIN(slb_miss_realmode)
stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
- std r3,PACA_EXSLB+EX_DAR(r13)
crset 4*cr0+eq
#ifdef CONFIG_PPC_STD_MMU_64
@@ -638,11 +637,10 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
#endif
ld r10,PACA_EXSLB+EX_LR(r13)
- ld r3,PACA_EXSLB+EX_R3(r13)
lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
mtlr r10
- beq 8f /* if bad address, make full stack frame */
+ beq- 8f /* if bad address, make full stack frame */
andi. r10,r12,MSR_RI /* check for unrecoverable exception */
beq- 2f
@@ -657,6 +655,7 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
.machine pop
RESTORE_PPR_PACA(PACA_EXSLB, r9)
+ ld r3,PACA_EXSLB+EX_R3(r13)
ld r9,PACA_EXSLB+EX_R9(r13)
ld r10,PACA_EXSLB+EX_R10(r13)
ld r11,PACA_EXSLB+EX_R11(r13)
@@ -665,7 +664,9 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
rfid
b . /* prevent speculative execution */
-2: mfspr r11,SPRN_SRR0
+2: std r3,PACA_EXSLB+EX_DAR(r13)
+ ld r3,PACA_EXSLB+EX_R3(r13)
+ mfspr r11,SPRN_SRR0
LOAD_HANDLER(r10,unrecov_slb)
mtspr SPRN_SRR0,r10
ld r10,PACAKMSR(r13)
@@ -673,7 +674,9 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
rfid
b .
-8: mfspr r11,SPRN_SRR0
+8: std r3,PACA_EXSLB+EX_DAR(r13)
+ ld r3,PACA_EXSLB+EX_R3(r13)
+ mfspr r11,SPRN_SRR0
LOAD_HANDLER(r10,bad_addr_slb)
mtspr SPRN_SRR0,r10
ld r10,PACAKMSR(r13)
--
2.11.0
