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riscv: memcpy: check src and dst before copy
author
Rick Chen
<rick@andestech.com>
Wed, 4 Jan 2023 01:56:28 +0000
(09:56 +0800)
committer
Leo Yu-Chi Liang
<ycliang@andestech.com>
Wed, 1 Feb 2023 08:17:45 +0000
(16:17 +0800)
Add src and dst address checking, if they
are the same address, just return and don't
copy data anymore.
Signed-off-by: Rick Chen <rick@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
arch/riscv/lib/memcpy.S
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diff --git
a/arch/riscv/lib/memcpy.S
b/arch/riscv/lib/memcpy.S
index
00672c1
..
9884077
100644
(file)
--- a/
arch/riscv/lib/memcpy.S
+++ b/
arch/riscv/lib/memcpy.S
@@
-9,6
+9,7
@@
/* void *memcpy(void *, const void *, size_t) */
ENTRY(__memcpy)
WEAK(memcpy)
+ beq a0, a1, .copy_end
/* Save for return value */
mv t6, a0
@@
-121,6
+122,7
@@
WEAK(memcpy)
2:
mv a0, t6
+.copy_end:
ret
.Lmisaligned_word_copy: