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|
; $Id: bzero.asm $
;; @file
; IPRT - No-CRT bzero - 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 cb gcc: rsi msc: rdx x86:[esp+8] wcall:edx
RT_NOCRT_BEGINPROC bzero
%ifdef RT_OS_DARWIN
GLOBALNAME __bzero
%endif
cld
%ifdef RT_ARCH_AMD64
xor eax, eax
%ifdef ASM_CALL64_MSC
mov r9, rdi ; save rdi in r9
mov rdi, rcx
; todo: alignment?
mov rcx, rdx
shr rcx, 3
rep stosq
and rdx, 7
mov rcx, rdx
rep stosb
mov rdi, r9 ; restore rdi
%else ; GCC
; todo: alignment?
mov rcx, rsi
shr rcx, 3
rep stosq
and rsi, 7
mov rcx, rsi
rep stosb
%endif ; GCC
%elif ARCH_BITS == 32
push ebp
mov ebp, esp
push edi
%ifdef ASM_CALL32_WATCOM
mov ecx, edx
mov edi, eax
%else
mov ecx, [ebp + 0ch]
mov edi, [ebp + 08h]
%endif
xor eax, eax
mov edx, ecx
shr ecx, 2
rep stosd
and edx, 3
mov ecx, edx
rep stosb
pop edi
leave
%elif ARCH_BITS == 16
push bp
mov bp, sp
push di
mov cx, [bp + 0ch]
mov di, [bp + 08h]
xor ax, ax
; align di.
test di, 1
jz .aligned
jcxz .done
stosb
dec cx
jz .done
.aligned:
mov dx, cx
shr cx, 1
rep stosw
test dl, 1
jz .done
stosb
.done:
pop di
pop bp
%else
%error ARCH_BITS
%endif ; X86
ret
ENDPROC RT_NOCRT(bzero)
|
