mirror of https://github.com/acidanthera/audk.git
59 lines
1.7 KiB
ArmAsm
59 lines
1.7 KiB
ArmAsm
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006, Intel Corporation
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# All rights reserved. This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# CopyMem.Asm
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#
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# Abstract:
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#
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# CopyMem function
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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.386:
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.code:
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.global _InternalMemCopyMem
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_InternalMemCopyMem:
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push %esi
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push %edi
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movl 16(%esp),%esi # esi <- Source
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movl 12(%esp),%edi # edi <- Destination
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movl 20(%esp),%edx # edx <- Count
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leal -1(%edi,%edx),%eax # eax <- End of Destination
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cmpl %edi,%esi
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jae L0
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cmpl %esi,%eax
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jae @CopyBackward # Copy backward if overlapped
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L0:
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movl %edx,%ecx
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andl $3,%edx
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shrl $2,%ecx
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rep
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movsl # Copy as many Dwords as possible
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jmp @CopyBytes
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@CopyBackward:
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movl %eax,%edi # edi <- End of Destination
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leal -1(%esi,%edx),%esi # esi <- End of Source
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std
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@CopyBytes:
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movl %edx,%ecx
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rep
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movsb # Copy bytes backward
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cld
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movl 12(%esp),%eax # eax <- Destination as return value
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push %edi
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push %esi
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ret
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