1 files changed, 47 insertions, 0 deletions
diff --git a/arch/sparc/lib/strncpy_from_user.S b/arch/sparc/lib/strncpy_from_user.S
new file mode 100644
index 0000000..d771989
--- /dev/null
+++ b/arch/sparc/lib/strncpy_from_user.S
@@ -0,0 +1,47 @@
+/* strncpy_from_user.S: Sparc strncpy from userspace.
+ *
+ *  Copyright(C) 1996 David S. Miller
+ */
+
+#include <asm/ptrace.h>
+#include <asm/errno.h>
+
+	.text
+	.align	4
+
+	/* Must return:
+	 *
+	 * -EFAULT		for an exception
+	 * count		if we hit the buffer limit
+	 * bytes copied		if we hit a null byte
+	 */
+
+	.globl	__strncpy_from_user
+__strncpy_from_user:
+	/* %o0=dest, %o1=src, %o2=count */
+	mov	%o2, %o3
+1:
+	subcc	%o2, 1, %o2
+	bneg	2f
+	 nop
+10:
+	ldub	[%o1], %o4
+	add	%o0, 1, %o0
+	cmp	%o4, 0
+	add	%o1, 1, %o1
+	bne	1b
+	 stb	%o4, [%o0 - 1]
+2:
+	add	%o2, 1, %o0
+	retl
+	 sub	%o3, %o0, %o0
+
+	.section .fixup,#alloc,#execinstr
+	.align	4
+4:
+	retl
+	 mov	-EFAULT, %o0
+
+	.section __ex_table,#alloc
+	.align	4
+	.word	10b, 4b