| #------------------------------------------------------------------------------ |
| # |
| # Copyright (c) 2006, Intel Corporation |
| # All rights reserved. This program and the accompanying materials |
| # are licensed and made available under the terms and conditions of the BSD License |
| # which accompanies this distribution. The full text of the license may be found at |
| # http://opensource.org/licenses/bsd-license.php |
| # |
| # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. |
| # |
| # Module Name: |
| # |
| # CopyMem.Asm |
| # |
| # Abstract: |
| # |
| # CopyMem function |
| # |
| # Notes: |
| # |
| #------------------------------------------------------------------------------ |
| |
| .386: |
| .code: |
| |
| .global _InternalMemCopyMem |
| _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 |
| jae L0 |
| cmpl %esi,%eax |
| jae @CopyBackward # Copy backward if overlapped |
| 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 |
| std |
| @CopyBytes: |
| movl %edx,%ecx |
| rep |
| movsb # Copy bytes backward |
| cld |
| movl 12(%esp),%eax # eax <- Destination as return value |
| push %edi |
| push %esi |
| ret |
