Commit | Line | Data |
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77c93b2f G |
1 | /* |
2 | * linux/arch/unicore32/lib/strnlen_user.S | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | #include <linux/linkage.h> | |
13 | #include <asm/assembler.h> | |
14 | #include <asm/errno.h> | |
15 | ||
16 | .text | |
17 | .align 5 | |
18 | ||
19 | /* Prototype: unsigned long __strnlen_user(const char *str, long n) | |
20 | * Purpose : get length of a string in user memory | |
21 | * Params : str - address of string in user memory | |
22 | * Returns : length of string *including terminator* | |
23 | * or zero on exception, or n + 1 if too long | |
24 | */ | |
25 | ENTRY(__strnlen_user) | |
26 | mov r2, r0 | |
27 | 1: | |
28 | ldrusr r3, r0, 1 | |
29 | cxor.a r3, #0 | |
30 | beq 2f | |
31 | sub.a r1, r1, #1 | |
32 | bne 1b | |
33 | add r0, r0, #1 | |
34 | 2: sub r0, r0, r2 | |
35 | mov pc, lr | |
36 | ENDPROC(__strnlen_user) | |
37 | ||
38 | .pushsection .fixup,"ax" | |
39 | .align 0 | |
40 | 9001: mov r0, #0 | |
41 | mov pc, lr | |
42 | .popsection |