diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.asm')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.asm | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.asm b/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.asm index 43630715cb..a2e04056fd 100644 --- a/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.asm +++ b/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.asm @@ -23,10 +23,19 @@ .code
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemCopyMem (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; )
+;------------------------------------------------------------------------------
InternalMemCopyMem PROC USES rsi rdi
mov rsi, rdx ; rsi <- Source
mov rdi, rcx ; rdi <- Destination
- lea r9, [rdi + r8 - 1] ; r9 <- End of Destination
+ lea r9, [rsi + r8 - 1] ; r9 <- End of Source
cmp rsi, rdi
mov rax, rdi ; rax <- Destination as return value
jae @F
@@ -39,8 +48,8 @@ InternalMemCopyMem PROC USES rsi rdi rep movsq ; Copy as many Qwords as possible
jmp @CopyBytes
@CopyBackward:
- mov rdi, r9 ; rdi <- End of Destination
- lea rsi, [rsi + r8 - 1] ; esi <- End of Source
+ mov rsi, r9 ; rsi <- End of Source
+ lea rdi, [rdi + r8 - 1] ; esi <- End of Destination
std ; set direction flag
@CopyBytes:
mov rcx, r8
|