From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/lib/strnlen_user.S | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 arch/arm/lib/strnlen_user.S (limited to 'arch/arm/lib/strnlen_user.S') diff --git a/arch/arm/lib/strnlen_user.S b/arch/arm/lib/strnlen_user.S new file mode 100644 index 00000000..0ecbb459 --- /dev/null +++ b/arch/arm/lib/strnlen_user.S @@ -0,0 +1,40 @@ +/* + * linux/arch/arm/lib/strnlen_user.S + * + * Copyright (C) 1995-2000 Russell King + * + * 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 +#include +#include + + .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 + teq r3, #0 + beq 2f + subs 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 -- cgit v1.2.3