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1 | ; $Id: strlen.asm 56290 2015-06-09 14:01:31Z vboxsync $
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2 | ;; @file
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3 | ; IPRT - No-CRT strlen - AMD64 & X86.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2015 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 | ; The contents of this file may alternatively be used under the terms
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18 | ; of the Common Development and Distribution License Version 1.0
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19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | ; VirtualBox OSE distribution, in which case the provisions of the
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21 | ; CDDL are applicable instead of those of the GPL.
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22 | ;
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23 | ; You may elect to license modified versions of this file under the
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24 | ; terms and conditions of either the GPL or the CDDL or both.
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25 | ;
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26 |
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27 | %include "iprt/asmdefs.mac"
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28 |
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29 | BEGINCODE
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30 |
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31 | ;;
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32 | ; @param psz gcc: rdi msc: rcx x86: [esp+4]
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33 | RT_NOCRT_BEGINPROC strlen
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34 | cld
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35 | %ifdef RT_ARCH_AMD64
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36 | %ifdef ASM_CALL64_MSC
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37 | mov r9, rdi ; save rdi
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38 | mov rdi, rcx
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39 | %endif
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40 | %else
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41 | mov edx, edi ; save edi
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42 | mov edi, [esp + 4]
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43 | %endif
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44 |
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45 | ; do the search
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46 | mov xCX, -1
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47 | xor eax, eax
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48 | repne scasb
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49 |
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50 | ; found it
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51 | neg xCX
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52 | lea xAX, [xCX - 2]
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53 | %ifdef ASM_CALL64_MSC
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54 | mov rdi, r9
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55 | %endif
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56 | %ifdef RT_ARCH_X86
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57 | mov edi, edx
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58 | %endif
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59 | ret
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60 | ENDPROC RT_NOCRT(strlen)
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61 |
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