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powerpc: No need to preserve count register across system call 

The count register is volatile so we don't need to preserve it.
Store zero to the entry in the exception frame.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2012-04-04 18:26:39 +00:00 committed by Benjamin Herrenschmidt
parent 823df43552
commit 82087414c6
1 changed files with 1 additions and 2 deletions
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3
arch/powerpc/kernel/entry_64.S
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@ -83,6 +83,7 @@ system_call_common:
std r11,GPR11(r1) std r11,GPR11(r1)
std r11,GPR12(r1) std r11,GPR12(r1)
std r11,_XER(r1) std r11,_XER(r1)
std r11,_CTR(r1)
std r9,GPR13(r1) std r9,GPR13(r1)
mfcr r9 mfcr r9
mflr r10 mflr r10
@ -90,8 +91,6 @@ system_call_common:
std r9,_CCR(r1) std r9,_CCR(r1)
std r10,_LINK(r1) std r10,_LINK(r1)
std r11,_TRAP(r1) std r11,_TRAP(r1)
mfctr r10
std r10,_CTR(r1)
std r3,ORIG_GPR3(r1) std r3,ORIG_GPR3(r1)
ld r2,PACATOC(r13) ld r2,PACATOC(r13)
addi r9,r1,STACK_FRAME_OVERHEAD addi r9,r1,STACK_FRAME_OVERHEAD