Commit 20055a8b authored by Santosh Sivaraj's avatar Santosh Sivaraj Committed by Michael Ellerman

powerpc/memcpy: Fix stack corruption for smaller sizes

For sizes lesser than 128 bytes, the code branches out early without saving
the stack frame, which when restored later drops frame of the caller.
Tested-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: default avatarSantosh Sivaraj <santosh@fossix.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190903214359.23887-1-santosh@fossix.org
parent aa497d43
...@@ -84,7 +84,6 @@ err1; stw r0,0(r3) ...@@ -84,7 +84,6 @@ err1; stw r0,0(r3)
3: sub r5,r5,r6 3: sub r5,r5,r6
cmpldi r5,128 cmpldi r5,128
blt 5f
mflr r0 mflr r0
stdu r1,-STACKFRAMESIZE(r1) stdu r1,-STACKFRAMESIZE(r1)
...@@ -99,6 +98,7 @@ err1; stw r0,0(r3) ...@@ -99,6 +98,7 @@ err1; stw r0,0(r3)
std r22,STK_REG(R22)(r1) std r22,STK_REG(R22)(r1)
std r0,STACKFRAMESIZE+16(r1) std r0,STACKFRAMESIZE+16(r1)
blt 5f
srdi r6,r5,7 srdi r6,r5,7
mtctr r6 mtctr r6
......
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