; $Id: memcpy.asm 93115 2022-01-01 11:31:46Z vboxsync $ ;; @file ; IPRT - No-CRT memcpy - AMD64 & X86. ; ; ; Copyright (C) 2006-2022 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 %ifdef IN_RING0_DRV_ON_DARWIN global NAME(memcpy):private_extern NAME(memcpy): %else RT_NOCRT_BEGINPROC memcpy %endif cld ; Do the bulk of the work. %ifdef RT_ARCH_AMD64 %ifdef DEBUG push rbp mov rbp, rsp %endif %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 mov rax, rdi ; save the return value shr rcx, 3 rep movsq %else push edi push esi %ifdef ASM_CALL32_WATCOM mov edi, eax mov esi, edx mov ecx, ebx mov edx, ebx %else mov ecx, [esp + 0ch + 8] mov edi, [esp + 04h + 8] mov esi, [esp + 08h + 8] mov edx, ecx mov eax, edi ; save the return value %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: %ifdef RT_ARCH_AMD64 %ifdef ASM_CALL64_MSC mov rdi, r10 mov rsi, r11 %endif %ifdef DEBUG leave %endif %else pop esi pop edi %endif ret ENDPROC RT_NOCRT(memcpy)