Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / unicore32 / lib / strnlen_user.S

diff --git a/kernel/arch/unicore32/lib/strnlen_user.S b/kernel/arch/unicore32/lib/strnlen_user.S
new file mode 100644 (file)
index 0000000..7586303
--- /dev/null
+++ b/kernel/arch/unicore32/lib/strnlen_user.S
@@ -0,0 +1,42 @@
+/*
+ * 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