patch-2.1.30 linux/arch/sparc64/lib/strncpy_from_user.S

• Lines: 55
• Date: Thu Mar 20 16:43:32 1997
• Orig file: v2.1.29/linux/arch/sparc64/lib/strncpy_from_user.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.29/linux/arch/sparc64/lib/strncpy_from_user.S linux/arch/sparc64/lib/strncpy_from_user.S
@@ -0,0 +1,54 @@
+/* strncpy_from_user.S: Sparc64 strncpy from userspace.
+ *
+ *  Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <asm/asi.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 */
+	brlez,pn %o2, 3f
+	 add	%o1, %o2, %o1
+	sub	%g0, %o2, %o3
+	add	%o0, %o2, %o0
+10:
+	ldub	[%o1 + %o3], %o4
+1:
+	brz,pn	%o4, 2f
+	 stb	%o4, [%o0 + %o3]
+	addcc	%o3, 1, %o3
+	bne,pt	%xcc, 1b
+11:
+	 ldub	[%o1 + %o3], %o4
+	retl
+	 mov	%o2, %o0
+2:
+	add	%o3, 1, %o3
+	retl
+	 add	%o2, %o3, %o0
+3:
+	retl
+	 clr	%o0
+
+	.section .fixup,#alloc,#execinstr
+	.align	4
+4:
+	retl
+	 mov	-EFAULT, %o0
+
+	.section __ex_table,#alloc
+	.align	4
+	.word	10b, 4b
+	.word	11b, 4b