1 files changed, 100 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/mempcpy.asm b/src/VBox/Runtime/common/string/mempcpy.asm
new file mode 100644
index 00000000..f244381d
--- /dev/null
+++ b/src/VBox/Runtime/common/string/mempcpy.asm
@@ -0,0 +1,100 @@
+; $Id: mempcpy.asm $
+;; @file
+; IPRT - No-CRT mempcpy - 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 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)
+