* [PATCH v3 19/21] powerpc/8xx: Don't restore regs to save them again.
@ 2014-09-17 16:37 Christophe Leroy
0 siblings, 0 replies; only message in thread
From: Christophe Leroy @ 2014-09-17 16:37 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras
Cc: scottwood, linuxppc-dev, linux-kernel
There is not need to restore r10, r11 and cr registers at this end of ITLBmiss
handler as they are saved again to the same place in ITLBError handler we are
jumping to.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
Changes in v2:
- None
Changes in v3:
- None
arch/powerpc/kernel/head_8xx.S | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index bb7c816..e21f0b2 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -381,8 +381,7 @@ InstructionTLBMiss:
lwz r3, 8(r0)
#endif
mfspr r10, SPRN_SPRG_SCRATCH2
- EXCEPTION_EPILOG_0
- b InstructionTLBError
+ b InstructionTLBError1
. = 0x1200
DataStoreTLBMiss:
@@ -471,7 +470,10 @@ DataStoreTLBMiss:
*/
. = 0x1300
InstructionTLBError:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG_0
+InstructionTLBError1:
+ EXCEPTION_PROLOG_1
+ EXCEPTION_PROLOG_2
mr r4,r12
mr r5,r9
EXC_XFER_LITE(0x1300, handle_page_fault)
--
1.7.1
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2014-09-17 16:37 [PATCH v3 19/21] powerpc/8xx: Don't restore regs to save them again Christophe Leroy
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