MdePkg BaseMemoryLibSse2: Convert X64/CopyMem.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/CopyMem.asm to X64/CopyMem.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Jordan Justen 2016-05-30 18:52:13 -07:00 committed by Liming Gao
parent e8758b6af0
commit 9987eaeab9
2 changed files with 85 additions and 0 deletions

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@ -111,6 +111,7 @@
X64/SetMem16.asm X64/SetMem16.asm
X64/SetMem.nasm X64/SetMem.nasm
X64/SetMem.asm X64/SetMem.asm
X64/CopyMem.nasm
X64/CopyMem.asm X64/CopyMem.asm
X64/ScanMem64.nasm X64/ScanMem64.nasm
X64/ScanMem64.S X64/ScanMem64.S
@ -132,6 +133,7 @@
X64/SetMem16.S X64/SetMem16.S
X64/SetMem.nasm X64/SetMem.nasm
X64/SetMem.S X64/SetMem.S
X64/CopyMem.nasm
X64/CopyMem.S X64/CopyMem.S
[Packages] [Packages]

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@ -0,0 +1,83 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; 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.nasm
;
; Abstract:
;
; CopyMem function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; VOID *
; EFIAPI
; InternalMemCopyMem (
; IN VOID *Destination,
; IN VOID *Source,
; IN UINTN Count
; );
;------------------------------------------------------------------------------
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 <- Last byte of Source
cmp rsi, rdi
mov rax, rdi ; rax <- Destination as return value
jae .0 ; Copy forward if Source > Destination
cmp r9, rdi ; Overlapped?
jae @CopyBackward ; Copy backward if overlapped
.0:
xor rcx, rcx
sub rcx, rdi ; rcx <- -rdi
and rcx, 15 ; rcx + rsi should be 16 bytes aligned
jz .1 ; skip if rcx == 0
cmp rcx, r8
cmova rcx, r8
sub r8, rcx
rep movsb
.1:
mov rcx, r8
and r8, 15
shr rcx, 4 ; rcx <- # of DQwords to copy
jz @CopyBytes
movdqa [rsp + 0x18], xmm0 ; save xmm0 on stack
.2:
movdqu xmm0, [rsi] ; rsi may not be 16-byte aligned
movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
add rsi, 16
add rdi, 16
loop .2
mfence
movdqa xmm0, [rsp + 0x18] ; restore xmm0
jmp @CopyBytes ; copy remaining bytes
@CopyBackward:
mov rsi, r9 ; rsi <- Last byte of Source
lea rdi, [rdi + r8 - 1] ; rdi <- Last byte of Destination
std
@CopyBytes:
mov rcx, r8
rep movsb
cld
pop rdi
pop rsi
ret