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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
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