| /* | |
| * linux/arch/unicore32/lib/strnlen_user.S | |
| * | |
| * Code specific to PKUnity SoC and UniCore ISA | |
| * | |
| * Copyright (C) 2001-2010 GUAN Xue-tao | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/assembler.h> | |
| #include <asm/errno.h> | |
| .text | |
| .align 5 | |
| /* Prototype: unsigned long __strnlen_user(const char *str, long n) | |
| * Purpose : get length of a string in user memory | |
| * Params : str - address of string in user memory | |
| * Returns : length of string *including terminator* | |
| * or zero on exception, or n + 1 if too long | |
| */ | |
| ENTRY(__strnlen_user) | |
| mov r2, r0 | |
| 1: | |
| ldrusr r3, r0, 1 | |
| cxor.a r3, #0 | |
| beq 2f | |
| sub.a r1, r1, #1 | |
| bne 1b | |
| add r0, r0, #1 | |
| 2: sub r0, r0, r2 | |
| mov pc, lr | |
| ENDPROC(__strnlen_user) | |
| .pushsection .fixup,"ax" | |
| .align 0 | |
| 9001: mov r0, #0 | |
| mov pc, lr | |
| .popsection |