2008-11-03 10:25:10 +01:00
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#
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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, 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 <- Last byte 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 L0 # Copy forward if Source > Destination
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cmp r9, rdi # Overlapped?
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jae L_CopyBackward # Copy backward if overlapped
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L0:
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xor rcx, rcx
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sub rcx, rdi # rcx <- -rdi
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and rcx, 15 # rcx + rsi should be 16 bytes aligned
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jz L1 # skip if rcx == 0
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cmp rcx, r8
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cmova rcx, r8
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sub r8, rcx
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rep movsb
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L1:
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mov rcx, r8
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and r8, 15
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shr rcx, 4 # rcx <- # of DQwords to copy
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jz L_CopyBytes
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movdqa [rsp + 0x18], xmm0 # save xmm0 on stack
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L2:
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movdqu xmm0, [rsi] # rsi may not be 16-byte aligned
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movntdq [rdi], xmm0 # rdi should be 16-byte aligned
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add rsi, 16
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add rdi, 16
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loop L2
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mfence
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movdqa xmm0, [rsp + 0x18] # restore xmm0
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jmp L_CopyBytes # copy remaining bytes
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L_CopyBackward:
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mov rsi, r9 # rsi <- Last byte of Source
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lea rdi, [rdi + r8 - 1] # rdi <- Last byte of Destination
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std
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L_CopyBytes:
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mov rcx, r8
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rep movsb
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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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