1 files changed, 52 insertions, 0 deletions
diff --git a/arch/blackfin/lib/strncpy.S b/arch/blackfin/lib/strncpy.S
new file mode 100644
index 000000000000..39fbbe6523e5
--- /dev/null
+++ b/arch/blackfin/lib/strncpy.S
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2005-2010 Analog Devices Inc.
+ *
+ * Licensed under the ADI BSD license or the GPL-2 (or later)
+ */
+
+#include <linux/linkage.h>
+
+/* void *strncpy(char *dest, const char *src, size_t n);
+ * R0 = address (dest)
+ * R1 = address (src)
+ * R2 = size
+ * Returns a pointer to the destination string dest
+ */
+
+#ifdef CONFIG_STRNCPY_L1
+.section .l1.text
+#else
+.text
+#endif
+
+.align 2
+
+ENTRY(_strncpy)
+	CC = R2 == 0;
+	if CC JUMP 4f;
+	P0 = R0 ;       /* dst*/
+	P1 = R1 ;       /* src*/
+
+1:
+	R1 = B [P1++] (Z);
+	B [P0++] = R1;
+	CC = R1;
+	if ! cc jump 2f;
+	R2 += -1;
+	CC = R2 == 0;
+	if ! cc jump 1b (bp);
+	jump 4f;
+2:
+	/* if src is shorter than n, we need to null pad bytes in dest */
+	R1 = 0;
+3:
+	R2 += -1;
+	CC = R2 == 0;
+	if cc jump 4f;
+	B [P0++] = R1;
+	jump 3b;
+
+4:
+	RTS;
+
+ENDPROC(_strncpy)