; $Id$

;; @file

; innotek Portable Runtime - No-CRT memset - AMD64 & X86.

;

;

; Copyright (C) 2006-2007 innotek GmbH

;

; 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 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.

;

; If you received this file as part of a commercial VirtualBox

; distribution, then only the terms of your commercial VirtualBox

; license agreement apply instead of the previous paragraph.

;

%include "iprt/asmdefs.mac"

BEGINCODE

;;

; @param pvDst gcc: rdi msc: ecx x86:[esp+4]

; @param ch gcc: esi msc: edx x86:[esp+8]

; @param cb gcc: rdx msc: r8 x86:[esp+0ch]

BEGINPROC RT_NOCRT(memset)

cld

%ifdef __AMD64__

%ifdef ASM_CALL64_MSC

int3

%error "Port me"

%else

mov r10, rdi ; the return value.

movzx eax, sil

cmp rdx, 32

jb .dobytes

; eax = (al << 24) | (al << 16) | (al << 8) | al;

; rdx = (eax << 32) | eax

movzx esi, sil

mov rax, qword 0101010101010101h

imul rax, rsi

; todo: alignment.

mov rcx, rdx

shr rcx, 3

rep stosq

and rdx, 7

.dobytes:

mov rcx, rdx

rep stosb

mov rax, rdi

%endif

%else

push edi

mov ecx, [esp + 0ch + 4]

movzx eax, byte [esp + 08h + 4]

mov edi, [esp + 04h + 4]

cmp ecx, 12

jb .dobytes

; eax = (al << 24) | (al << 16) | (al << 8) | al;

mov ah, al

mov edx, eax

shr edx, 16

or eax, edx

mov edx, ecx

shr ecx, 2

rep stosd

and edx, 3

mov ecx, edx

.dobytes:

rep stosb

pop edi

mov eax, [esp + 4]

%endif

ret

ENDPROC RT_NOCRT(memset)