diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm index 7b3e5eafee..86677ef614 100644 --- a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm +++ b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm @@ -25,14 +25,22 @@ .model flat,C
.code
+;------------------------------------------------------------------------------
+; VOID *
+; InternalMemCopyMem (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; )
+;------------------------------------------------------------------------------
InternalMemCopyMem PROC USES esi edi
mov esi, [esp + 16] ; esi <- Source
mov edi, [esp + 12] ; edi <- Destination
mov edx, [esp + 20] ; edx <- Count
- lea eax, [edi + edx - 1] ; eax <- End of Destination
+ lea eax, [esi + edx - 1] ; eax <- End of Source
cmp esi, edi
jae @F
- cmp eax, esi
+ cmp eax, edi
jae @CopyBackward ; Copy backward if overlapped
@@:
mov ecx, edx
@@ -41,8 +49,8 @@ InternalMemCopyMem PROC USES esi edi rep movsd ; Copy as many Dwords as possible
jmp @CopyBytes
@CopyBackward:
- mov edi, eax ; edi <- End of Destination
- lea esi, [esi + edx - 1] ; esi <- End of Source
+ mov esi, eax ; esi <- End of Source
+ lea edi, [edi + edx - 1] ; edi <- End of Destination
std
@CopyBytes:
mov ecx, edx
|