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; $Id: mempcpy.asm $
;; @file
; IPRT - No-CRT mempcpy - AMD64 & X86.
;
;
; Copyright (C) 2006-2020 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; @param pvDst gcc: rdi msc: rcx x86:[esp+4] wcall: eax
; @param pvSrc gcc: rsi msc: rdx x86:[esp+8] wcall: edx
; @param cb gcc: rdx msc: r8 x86:[esp+0ch] wcall: ebx
RT_NOCRT_BEGINPROC mempcpy
cld ; paranoia
; Do the bulk of the work.
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save
mov r11, rsi ; save
mov rdi, rcx
mov rsi, rdx
mov rcx, r8
mov rdx, r8
%else
mov rcx, rdx
%endif
shr rcx, 3
rep movsq
%else
%ifdef ASM_CALL32_WATCOM
xchg eax, edi ; saving edi in eax and loading it
push esi
mov esi, edx
mov ecx, ebx
mov edx, ebx
%else
mov eax, edi ; saving edi in eax
push esi
mov ecx, [esp + 0ch + 4]
mov edi, [esp + 04h + 4]
mov esi, [esp + 08h + 4]
mov edx, ecx
%endif
shr ecx, 2
rep movsd
%endif
; The remaining bytes.
%ifdef RT_ARCH_AMD64
test dl, 4
jz .dont_move_dword
movsd
%endif
.dont_move_dword:
test dl, 2
jz .dont_move_word
movsw
.dont_move_word:
test dl, 1
jz .dont_move_byte
movsb
.dont_move_byte:
; restore & return
%ifdef RT_ARCH_AMD64
mov rax, rdi
%ifdef ASM_CALL64_MSC
mov rsi, r11
mov rdi, r10
%endif
%else
pop esi
xchg eax, edi
%endif
ret
ENDPROC RT_NOCRT(mempcpy)
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