X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Favr32%2Flib%2Fstrnlen_user.S;fp=arch%2Favr32%2Flib%2Fstrnlen_user.S;h=65ce11afa66a258d31d413a6c578c2452789d9d7;hb=76828883507a47dae78837ab5dec5a5b4513c667;hp=0000000000000000000000000000000000000000;hpb=64ba3f394c830ec48a1c31b53dcae312c56f1604;p=linux-2.6.git

diff --git a/arch/avr32/lib/strnlen_user.S b/arch/avr32/lib/strnlen_user.S
new file mode 100644
index 000000000..65ce11afa
--- /dev/null
+++ b/arch/avr32/lib/strnlen_user.S
@@ -0,0 +1,67 @@
+/*
+ * Copy to/from userspace with optional address space checking.
+ *
+ * Copyright 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/processor.h>
+#include <asm/asm.h>
+
+	.text
+	.align	1
+	.global	strnlen_user
+	.type	strnlen_user, "function"
+strnlen_user:
+	branch_if_kernel r8, __strnlen_user
+	sub	r8, r11, 1
+	add	r8, r12
+	retcs	0
+	brmi	adjust_length	/* do a closer inspection */
+
+	.global	__strnlen_user
+	.type	__strnlen_user, "function"
+__strnlen_user:
+	mov	r10, r12
+
+10:	ld.ub	r8, r12++
+	cp.w	r8, 0
+	breq	2f
+	sub	r11, 1
+	brne	10b
+
+	sub	r12, -1
+2:	sub	r12, r10
+	retal	r12
+
+
+	.type	adjust_length, "function"
+adjust_length:
+	cp.w	r12, 0		/* addr must always be < TASK_SIZE */
+	retmi	0
+
+	pushm	lr
+	lddpc	lr, _task_size
+	sub	r11, lr, r12
+	mov	r9, r11
+	rcall	__strnlen_user
+	cp.w	r12, r9
+	brgt	1f
+	popm	pc
+1:	popm	pc, r12=0
+
+	.align	2
+_task_size:
+	.long	TASK_SIZE
+
+	.section .fixup, "ax"
+	.align	1
+19:	retal	0
+
+	.section __ex_table, "a"
+	.align	2
+	.long	10b, 19b