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2fc59a003e
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10604 6f19259b-4bc3-4df7-8a09-765794883524
67 lines
2.2 KiB
ArmAsm
67 lines
2.2 KiB
ArmAsm
#
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# ConvertAsm.py: Automatically generated from CopyMem.asm
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#
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
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# 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.S
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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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#------------------------------------------------------------------------------
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# VOID *
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# EFIAPI
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# InternalMemCopyMem (
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# IN VOID *Destination,
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# IN VOID *Source,
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# IN UINTN Count
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# )
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
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ASM_PFX(InternalMemCopyMem):
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pushq %rsi
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pushq %rdi
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movq %rdx, %rsi # rsi <- Source
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movq %rcx, %rdi # rdi <- Destination
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leaq -1(%rsi, %r8,), %r9 # r9 <- End of Source
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cmpq %rdi, %rsi
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movq %rdi, %rax # rax <- Destination as return value
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jae _InternalMemCopyMem_al_0000
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cmpq %rdi, %r9
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jae _atSym_CopyBackward # Copy backward if overlapped
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_InternalMemCopyMem_al_0000:
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movq %r8, %rcx
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andq $7, %r8
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shrq $3, %rcx
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rep movsq # Copy as many Qwords as possible
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jmp _atSym_CopyBytes
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_atSym_CopyBackward:
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movq %r9, %rsi # rsi <- End of Source
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leaq -1(%rdi, %r8), %rdi # rdi <- End of Destination
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std # set direction flag
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_atSym_CopyBytes:
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movq %r8, %rcx
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rep movsb # Copy bytes backward
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cld
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popq %rdi
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popq %rsi
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ret
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