diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.S')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.S | 45 |
1 files changed, 26 insertions, 19 deletions
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.S b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.S index e80a00deb4..42695b28c4 100644 --- a/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.S +++ b/MdePkg/Library/BaseMemoryLibRepStr/Ia32/CopyMem.S @@ -21,38 +21,45 @@ # #------------------------------------------------------------------------------ - .386: - .code: - .global _InternalMemCopyMem + +#------------------------------------------------------------------------------ +# VOID * +# EFIAPI +# InternalMemCopyMem ( +# IN VOID *Destination, +# IN VOID *Source, +# IN UINTN Count +# ); +#------------------------------------------------------------------------------ _InternalMemCopyMem: push %esi push %edi - movl 16(%esp),%esi # esi <- Source - movl 12(%esp),%edi # edi <- Destination - movl 20(%esp),%edx # edx <- Count - leal -1(%edi,%edx),%eax # eax <- End of Destination - cmpl %edi,%esi + movl 16(%esp), %esi # esi <- Source + movl 12(%esp), %edi # edi <- Destination + movl 20(%esp), %edx # edx <- Count + leal -1(%esi, %edx), %eax # eax <- End of Source + cmpl %edi, %esi jae L0 - cmpl %esi,%eax + cmpl %edi, %eax jae @CopyBackward # Copy backward if overlapped -L0: - movl %edx,%ecx - andl $3,%edx - shrl $2,%ecx +L0: + movl %edx, %ecx + andl $3, %edx + shrl $2, %ecx rep movsl # Copy as many Dwords as possible jmp @CopyBytes -@CopyBackward: - movl %eax,%edi # edi <- End of Destination - leal -1(%esi,%edx),%esi # esi <- End of Source +@CopyBackward: + movl %eax, %esi # esi <- End of Source + leal -1(%edi, %edx), %edi # edi <- End of Destination std -@CopyBytes: - movl %edx,%ecx +@CopyBytes: + movl %edx, %ecx rep movsb # Copy bytes backward cld - movl 12(%esp),%eax # eax <- Destination as return value + movl 12(%esp), %eax # eax <- Destination as return value pop %edi pop %esi ret |