X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;ds=sidebyside;f=MdePkg%2FLibrary%2FBaseMemoryLibRepStr%2FIa32%2FCopyMem.asm;h=8b4366e976baea764c8b9e728cfeab991b09b28c;hb=f734a10ab104f1072f94cab66a5489e0fd8fce8a;hp=7b3e5eafee5c95b1c83b3a06d096411eaa2a90fc;hpb=878ddf1fc3540a715f63594ed22b6929e881afb4;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm
index 7b3e5eafee..8b4366e976 100644
--- a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm
+++ b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.asm
@@ -1,3 +1,8 @@
+//
+// Include common header file for this module.
+//
+
+
 ;------------------------------------------------------------------------------
 ;
 ; Copyright (c) 2006, Intel Corporation
@@ -25,14 +30,22 @@
     .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 +54,8 @@ 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