patch-2.4.0-test8 linux/arch/arm/lib/strnlen_user.S

• Lines: 37
• Date: Sun Sep 3 11:19:11 2000
• Orig file: v2.4.0-test7/linux/arch/arm/lib/strnlen_user.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test7/linux/arch/arm/lib/strnlen_user.S linux/arch/arm/lib/strnlen_user.S
@@ -0,0 +1,36 @@
+/*
+ * linux/arch/arm/lib/strnlen_user.S
+ *
+ * Copyright (C) 1995-2000 Russell King
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+	.text
+	.align	5
+
+/* Prototype: unsigned long __arch_strnlen_user(const char *str, long n)
+ * Purpose  : get length of a string in user memory
+ * Params   : str - address of string in user memory
+ * Returns  : length of string *including terminator*
+ *	      or zero on exception, or n + 1 if too long
+ */
+ENTRY(__arch_strnlen_user)
+	save_lr
+	mov	r2, r0
+1:
+USER(	ldrbt	r3, [r0], #1)
+	teq	r3, #0
+	beq	2f
+	subs	r1, r1, #1
+	bne	1b
+	add	r0, r0, #1
+2:	sub	r0, r0, r2
+	restore_pc
+
+	.section .fixup,"ax"
+	.align	0
+9001:	mov	r0, #0
+	restore_pc
+	.previous