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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/common/string/memcpy.asm | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/memcpy.asm b/src/VBox/Runtime/common/string/memcpy.asm new file mode 100644 index 00000000..a09e7a27 --- /dev/null +++ b/src/VBox/Runtime/common/string/memcpy.asm @@ -0,0 +1,100 @@ +; $Id: memcpy.asm $ +;; @file +; IPRT - No-CRT memcpy - AMD64 & X86. +; + +; +; Copyright (C) 2006-2019 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 memcpy + cld + + ; 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 + 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 +%else + pop esi + pop edi +%endif + ret +ENDPROC RT_NOCRT(memcpy) + |