VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/string/strlen.asm@ 33911

Last change on this file since 33911 was 28800, checked in by vboxsync, 15 years ago

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File size: 1.7 KB
Line 
1; $Id: strlen.asm 28800 2010-04-27 08:22:32Z vboxsync $
2;; @file
3; IPRT - No-CRT strlen - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2006-2008 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "iprt/asmdefs.mac"
28
29BEGINCODE
30
31;;
32; @param psz gcc: rdi msc: rcx x86: [esp+4]
33RT_NOCRT_BEGINPROC strlen
34 cld
35%ifdef RT_ARCH_AMD64
36 %ifdef ASM_CALL64_MSC
37 mov r9, rdi ; save rdi
38 mov rdi, rcx
39 %endif
40%else
41 mov edx, edi ; save edi
42 mov edi, [esp + 4]
43%endif
44
45 ; do the search
46 mov xCX, -1
47 xor eax, eax
48 repne scasb
49
50 ; found it
51 neg xCX
52 lea xAX, [xCX - 2]
53%ifdef ASM_CALL64_MSC
54 mov rdi, r9
55%endif
56%ifdef RT_ARCH_X86
57 mov edi, edx
58%endif
59 ret
60ENDPROC RT_NOCRT(strlen)
61
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