VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/string/strchr.asm@ 28800

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

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1; $Id: strchr.asm 28800 2010-04-27 08:22:32Z vboxsync $
2;; @file
3; IPRT - No-CRT strchr - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2006-2007 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]
33; @param ch gcc: esi msc: edx x86:[esp+8]
34RT_NOCRT_BEGINPROC strchr
35 cld
36
37 ; check for ch == 0 and setup normal strchr.
38%ifdef RT_ARCH_AMD64
39 %ifdef ASM_CALL64_MSC
40 or dl, dl
41 jz near .strlen
42 mov r9, rsi ; save rsi
43 mov rsi, rcx
44 %else
45 or sil, sil
46 jz near .strlen
47 mov edx, esi
48 mov rsi, rdi
49 %endif
50%else
51 mov edx, [esp + 8]
52 or dl, dl
53 jz near .strlen
54 mov ecx, esi ; save esi
55 mov esi, [esp + 4]
56%endif
57
58 ; do the search
59.next:
60 lodsb
61 cmp al, dl
62 je .found
63 test al, al
64 jz .not_found
65
66 lodsb
67 cmp al, dl
68 je .found
69 test al, al
70 jz .not_found
71
72 lodsb
73 cmp al, dl
74 je .found
75 test al, al
76 jz .not_found
77
78 lodsb
79 cmp al, dl
80 je .found
81 test al, al
82 jz .not_found
83 jmp .next
84
85.found:
86 lea xAX, [xSI - 1]
87%ifdef ASM_CALL64_MSC
88 mov rsi, r9
89%endif
90%ifdef RT_ARCH_X86
91 mov esi, ecx
92%endif
93 ret
94
95.not_found:
96%ifdef ASM_CALL64_MSC
97 mov rsi, r9
98%endif
99%ifdef RT_ARCH_X86
100 mov esi, ecx
101%endif
102 xor eax, eax
103 ret
104
105;
106; Special case: strchr(str, '\0');
107;
108align 16
109.strlen:
110%ifdef RT_ARCH_AMD64
111 %ifdef ASM_CALL64_MSC
112 mov r9, rdi ; save rdi
113 mov rdi, rcx
114 %endif
115%else
116 mov edx, edi ; save edi
117 mov edi, [esp + 4]
118%endif
119 mov xCX, -1
120 xor eax, eax
121 repne scasb
122
123 lea xAX, [xDI - 1]
124%ifdef ASM_CALL64_MSC
125 mov rdi, r9
126%endif
127%ifdef RT_ARCH_X86
128 mov edi, edx
129%endif
130 ret
131ENDPROC RT_NOCRT(strchr)
132
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