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| /*
| * 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
|
|
