1 files changed, 40 insertions, 0 deletions

diff --git a/arch/arm/lib/strnlen_user.S b/arch/arm/lib/strnlen_user.S
new file mode 100644
index 00000000000..0ecbb459c4f
--- /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 <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
+        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