patch-2.1.44 linux/arch/mips/lib/strncpy_user.S

• Lines: 49
• Date: Thu Jun 26 12:33:37 1997
• Orig file: v2.1.43/linux/arch/mips/lib/strncpy_user.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.43/linux/arch/mips/lib/strncpy_user.S linux/arch/mips/lib/strncpy_user.S
@@ -0,0 +1,48 @@
+/*
+ * arch/mips/lib/strncpy_user.S
+ *
+ * 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 by Ralf Baechle
+ */
+#include <linux/errno.h>
+
+#include <asm/asm.h>
+#include <asm/regdef.h>
+
+/*
+ * Returns: -EFAULT if exception before terminator, N if the entire
+ * buffer filled, else strlen.
+ */
+
+/*
+ * Ugly special case have to check: we might get passed a user space
+ * pointer which wraps into the kernel space ...
+ */
+
+LEAF(__strncpy_from_user)
+		move		v0,zero
+		move		v1,a1
+		.set		noreorder
+1:		lbu		t0,(v1)
+		LONG_ADDIU	v1,1
+		beqz		t0,2f
+		sb		t0,(a0)		# delay slot
+		LONG_ADDIU	v0,1
+		bne		v0,a2,1b
+		LONG_ADDIU	a0,1		# delay slot
+		.set		reorder
+2:		LONG_ADDU	t0,a1,v0
+		xor		t0,a1
+		bltz		t0,fault
+		jr		ra		# return n
+		END(__strncpy_from_user)
+
+fault:		li		v0,-EFAULT
+		jr		ra
+
+		.section	__ex_table,"a"
+		PTR		1b,fault
+		.previous