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MdePkg/BaseSynchronizationLib: fix AArch64 return values 

Fix the wrong return value of both InternalSyncIncrement()
and InternalSyncDecrement(). The return value shouldn't
be the address of input parameter. It should be the updated
value of input parameter instead.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18685 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Haojian Zhuang 2015-10-27 11:56:57 +00:00 committed by leiflindholm
parent 8a4582838b
commit 7fe513896e
1 changed files with 2 additions and 0 deletions
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2
MdePkg/Library/BaseSynchronizationLib/AArch64/Synchronization.S
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@ -171,6 +171,7 @@ TryInternalSyncIncrement:
add w1, w1, #1
stxr w2, w1, [x0]
cbnz w2, TryInternalSyncIncrement
mov w0, w1
dmb sy
ret
@ -199,5 +200,6 @@ TryInternalSyncDecrement:
sub w1, w1, #1
stxr w2, w1, [x0]
cbnz w2, TryInternalSyncDecrement
mov w0, w1
dmb sy
ret