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|
; $Id: strlen.asm $
;; @file
; IPRT - No-CRT strlen - 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 psz gcc: rdi msc: rcx x86: [esp+4] wcall: eax
RT_NOCRT_BEGINPROC strlen
cld
%ifdef RT_ARCH_AMD64
%ifdef ASM_CALL64_MSC
mov r9, rdi ; save rdi
mov rdi, rcx
%endif
%else
mov edx, edi ; save edi
%ifdef ASM_CALL32_WATCOM
mov edi, eax
%else
mov edi, [esp + 4]
%endif
%endif
; do the search
mov xCX, -1
xor eax, eax
repne scasb
; found it
neg xCX
lea xAX, [xCX - 2]
%ifdef ASM_CALL64_MSC
mov rdi, r9
%endif
%ifdef RT_ARCH_X86
mov edi, edx
%endif
ret
ENDPROC RT_NOCRT(strlen)
|
