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|
; $Id: memset.asm $
;; @file
; IPRT - No-CRT memset - AMD64 & X86.
;
;
; Copyright (C) 2006-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program 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 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox 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.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; @param pvDst gcc: rdi msc: ecx x86:[esp+4] wcall: eax
; @param ch gcc: esi msc: edx x86:[esp+8] wcall: edx
; @param cb gcc: rdx msc: r8 x86:[esp+0ch] wcall: ebx
RT_NOCRT_BEGINPROC memset
cld
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
mov r9, rdi ; save rdi in r9
mov rdi, rcx
mov r10, rcx ; the return value.
movzx eax, dl
cmp r8, 32
jb .dobytes
; eax = (al << 24) | (al << 16) | (al << 8) | al;
; rdx = (eax << 32) | eax
movzx edx, dl
mov rax, qword 0101010101010101h
imul rax, rdx
; todo: alignment.
mov rcx, r8
shr rcx, 3
rep stosq
and r8, 7
.dobytes:
mov rcx, r8
rep stosb
mov rdi, r9 ; restore rdi
mov rax, r10
%else ; GCC
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, r10
%endif ; GCC
%else ; X86
push edi
%ifdef ASM_CALL32_WATCOM
push eax
mov edi, eax
mov ecx, ebx
movzx eax, dl
%else
mov ecx, [esp + 0ch + 4]
movzx eax, byte [esp + 08h + 4]
mov edi, [esp + 04h + 4]
%endif
cmp ecx, 12
jb .dobytes
; eax = (al << 24) | (al << 16) | (al << 8) | al;
mov ah, al
mov edx, eax
shl edx, 16
or eax, edx
mov edx, ecx
shr ecx, 2
rep stosd
and edx, 3
mov ecx, edx
.dobytes:
rep stosb
%ifdef ASM_CALL32_WATCOM
pop eax
pop edi
%else
pop edi
mov eax, [esp + 4]
%endif
%endif ; X86
ret
ENDPROC RT_NOCRT(memset)
|
