[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibRepStr / X64 / CopyMem.S

#
# ConvertAsm.py: Automatically generated from CopyMem.asm
#
#------------------------------------------------------------------------------
#
# 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.S
#
# Abstract:
#
#   CopyMem function
#
# Notes:
#
#------------------------------------------------------------------------------


#------------------------------------------------------------------------------
#  VOID *
#  EFIAPI
#  InternalMemCopyMem (
#    IN VOID   *Destination,
#    IN VOID   *Source,
#    IN UINTN  Count
#    )
#------------------------------------------------------------------------------
.intel_syntax noprefix
.globl ASM_PFX(InternalMemCopyMem)
ASM_PFX(InternalMemCopyMem):
    push    rsi
    push    rdi
    mov     rsi, rdx                    # rsi <- Source
    mov     rdi, rcx                    # rdi <- Destination
    lea     r9, [rsi + r8 - 1]          # r9 <- End of Source
    cmp     rsi, rdi
    mov     rax, rdi                    # rax <- Destination as return value
    jae     _InternalMemCopyMem_al_0000
    cmp     r9, rdi
    jae     _atSym_CopyBackward               # Copy backward if overlapped
_InternalMemCopyMem_al_0000:
    mov     rcx, r8
    and     r8, 7
    shr     rcx, 3
    rep     movsq                       # Copy as many Qwords as possible
    jmp     _atSym_CopyBytes
_atSym_CopyBackward:
    mov     rsi, r9                     # rsi <- End of Source
    lea     rdi, [rdi + r8 - 1]         # esi <- End of Destination
    std                                 # set direction flag
_atSym_CopyBytes:
    mov     rcx, r8
    rep     movsb                       # Copy bytes backward
    cld
    pop     rdi
    pop     rsi
    ret
Commit	Line	Data
bdfb1261	1	#
	2	# ConvertAsm.py: Automatically generated from CopyMem.asm
	3	#
	4	#------------------------------------------------------------------------------
	5	#
	6	# Copyright (c) 2006, Intel Corporation
	7	# All rights reserved. This program and the accompanying materials
	8	# are licensed and made available under the terms and conditions of the BSD License
	9	# which accompanies this distribution. The full text of the license may be found at
	10	# http://opensource.org/licenses/bsd-license.php
	11	#
	12	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	13	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
	14	#
	15	# Module Name:
	16	#
	17	# CopyMem.S
	18	#
	19	# Abstract:
	20	#
	21	# CopyMem function
	22	#
	23	# Notes:
	24	#
	25	#------------------------------------------------------------------------------
	26
	27
	28	#------------------------------------------------------------------------------
	29	# VOID *
	30	# EFIAPI
	31	# InternalMemCopyMem (
	32	# IN VOID *Destination,
	33	# IN VOID *Source,
	34	# IN UINTN Count
	35	# )
	36	#------------------------------------------------------------------------------
4df876ad	37	.intel_syntax noprefix
	38	.globl ASM_PFX(InternalMemCopyMem)
	39	ASM_PFX(InternalMemCopyMem):
bdfb1261	40	push rsi
	41	push rdi
	42	mov rsi, rdx # rsi <- Source
	43	mov rdi, rcx # rdi <- Destination
	44	lea r9, [rsi + r8 - 1] # r9 <- End of Source
	45	cmp rsi, rdi
	46	mov rax, rdi # rax <- Destination as return value
	47	jae _InternalMemCopyMem_al_0000
	48	cmp r9, rdi
	49	jae _atSym_CopyBackward # Copy backward if overlapped
	50	_InternalMemCopyMem_al_0000:
	51	mov rcx, r8
	52	and r8, 7
	53	shr rcx, 3
	54	rep movsq # Copy as many Qwords as possible
	55	jmp _atSym_CopyBytes
	56	_atSym_CopyBackward:
	57	mov rsi, r9 # rsi <- End of Source
	58	lea rdi, [rdi + r8 - 1] # esi <- End of Destination
	59	std # set direction flag
	60	_atSym_CopyBytes:
	61	mov rcx, r8
	62	rep movsb # Copy bytes backward
	63	cld
	64	pop rdi
	65	pop rsi
	66	ret
	67