| /* |
| * 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 |
