d3febfd9ad
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3790 Replace Opcode with the corresponding instructions. The code changes have been verified with CompareBuild.py tool, which can be used to compare the results of two different EDK II builds to determine if they generate the same binaries. (tool link: https://github.com/mdkinney/edk2/tree/sandbox/CompareBuild) Signed-off-by: Jason Lou <yun.lou@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com>
69 lines
1.9 KiB
NASM
69 lines
1.9 KiB
NASM
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR>
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
; Module Name:
|
|
;
|
|
; CopyMem.nasm
|
|
;
|
|
; Abstract:
|
|
;
|
|
; CopyMem function
|
|
;
|
|
; Notes:
|
|
;
|
|
;------------------------------------------------------------------------------
|
|
|
|
DEFAULT REL
|
|
SECTION .text
|
|
|
|
;------------------------------------------------------------------------------
|
|
; VOID *
|
|
; EFIAPI
|
|
; InternalMemCopyMem (
|
|
; OUT VOID *DestinationBuffer,
|
|
; IN CONST VOID *SourceBuffer,
|
|
; IN UINTN Length
|
|
; );
|
|
;------------------------------------------------------------------------------
|
|
global 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 .0
|
|
cmp r9, rdi
|
|
jae @CopyBackward ; Copy backward if overlapped
|
|
.0:
|
|
mov rcx, r8
|
|
and r8, 7
|
|
shr rcx, 3 ; rcx <- # of Qwords to copy
|
|
jz @CopyBytes
|
|
movq r10, mm0
|
|
.1:
|
|
movq mm0, [rsi]
|
|
movntq [rdi], mm0
|
|
add rsi, 8
|
|
add rdi, 8
|
|
loop .1
|
|
mfence
|
|
movq mm0, r10
|
|
jmp @CopyBytes
|
|
@CopyBackward:
|
|
mov rsi, r9 ; rsi <- End of Source
|
|
lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination
|
|
std ; set direction flag
|
|
@CopyBytes:
|
|
mov rcx, r8
|
|
rep movsb ; Copy bytes backward
|
|
cld
|
|
pop rdi
|
|
pop rsi
|
|
ret
|
|
|