mirror of https://github.com/acidanthera/audk.git
68 lines
2.2 KiB
ArmAsm
68 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 - 2008, 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.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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.intel_syntax noprefix
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.globl ASM_PFX(InternalMemCopyMem)
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ASM_PFX(InternalMemCopyMem):
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push rsi
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push rdi
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mov rsi, rdx # rsi <- Source
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mov rdi, rcx # rdi <- Destination
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lea r9, [rsi + r8 - 1] # r9 <- End of Source
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cmp rsi, rdi
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mov rax, rdi # rax <- Destination as return value
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jae _InternalMemCopyMem_al_0000
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cmp r9, rdi
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jae _atSym_CopyBackward # Copy backward if overlapped
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_InternalMemCopyMem_al_0000:
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mov rcx, r8
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and r8, 7
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shr rcx, 3
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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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mov rsi, r9 # rsi <- End of Source
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lea rdi, [rdi + r8 - 1] # esi <- End of Destination
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std # set direction flag
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_atSym_CopyBytes:
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mov rcx, r8
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rep movsb # Copy bytes backward
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cld
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pop rdi
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pop rsi
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ret
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