1 files changed, 39 insertions, 0 deletions

diff --git a/arch/mips/lib/strlen_user.S b/arch/mips/lib/strlen_user.S
new file mode 100644
index 000000000000..07660e86c99d
--- /dev/null
+++ b/arch/mips/lib/strlen_user.S
@@ -0,0 +1,39 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1996, 1998, 1999, 2004 by Ralf Baechle
+ * Copyright (c) 1999 Silicon Graphics, Inc.
+ */
+#include <asm/asm.h>
+#include <asm/offset.h>
+#include <asm/regdef.h>
+
+#define EX(insn,reg,addr,handler)                       \
+9:      insn    reg, addr;                              \
+        .section __ex_table,"a";                        \
+        PTR     9b, handler;                            \
+        .previous
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 for error
+ */
+LEAF(__strlen_user_asm)
+        LONG_L          v0, TI_ADDR_LIMIT($28)  # pointer ok?
+        and             v0, a0
+        bnez            v0, fault
+
+FEXPORT(__strlen_user_nocheck_asm)
+        move            v0, a0
+1:      EX(lb, t0, (v0), fault)
+        PTR_ADDIU       v0, 1
+        bnez            t0, 1b
+        PTR_SUBU        v0, a0
+        jr              ra
+        END(__strlen_user_asm)
+
+fault:  move            v0, zero
+        jr              ra