From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/mn10300/lib/usercopy.c | 166 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 arch/mn10300/lib/usercopy.c

(limited to 'arch/mn10300/lib/usercopy.c')

diff --git a/arch/mn10300/lib/usercopy.c b/arch/mn10300/lib/usercopy.c
new file mode 100644
index 000000000..7826e6c36
--- /dev/null
+++ b/arch/mn10300/lib/usercopy.c
@@ -0,0 +1,166 @@
+/* MN10300 Userspace accessor functions
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <asm/uaccess.h>
+
+unsigned long
+__generic_copy_to_user(void *to, const void *from, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		__copy_user(to, from, n);
+	return n;
+}
+
+unsigned long
+__generic_copy_from_user(void *to, const void *from, unsigned long n)
+{
+	if (access_ok(VERIFY_READ, from, n))
+		__copy_user_zeroing(to, from, n);
+	return n;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+#define __do_strncpy_from_user(dst, src, count, res)		\
+do {								\
+	int w;							\
+	asm volatile(						\
+		"	mov	%1,%0\n"			\
+		"	cmp	0,%1\n"				\
+		"	beq	2f\n"				\
+		"0:\n"						\
+		"	movbu	(%5),%2\n"			\
+		"1:\n"						\
+		"	movbu	%2,(%6)\n"			\
+		"	inc	%5\n"				\
+		"	inc	%6\n"				\
+		"	cmp	0,%2\n"				\
+		"	beq	2f\n"				\
+		"	add	-1,%1\n"			\
+		"	bne	0b\n"				\
+		"2:\n"						\
+		"	sub	%1,%0\n"			\
+		"3:\n"						\
+		"	.section .fixup,\"ax\"\n"		\
+		"4:\n"						\
+		"	mov	%3,%0\n"			\
+		"	jmp	3b\n"				\
+		"	.previous\n"				\
+		"	.section __ex_table,\"a\"\n"		\
+		"	.balign 4\n"				\
+		"	.long 0b,4b\n"				\
+		"	.long 1b,4b\n"				\
+		"	.previous"				\
+		:"=&r"(res), "=r"(count), "=&r"(w)		\
+		:"i"(-EFAULT), "1"(count), "a"(src), "a"(dst)	\
+		: "memory", "cc");					\
+} while (0)
+
+long
+__strncpy_from_user(char *dst, const char *src, long count)
+{
+	long res;
+	__do_strncpy_from_user(dst, src, count, res);
+	return res;
+}
+
+long
+strncpy_from_user(char *dst, const char *src, long count)
+{
+	long res = -EFAULT;
+	if (access_ok(VERIFY_READ, src, 1))
+		__do_strncpy_from_user(dst, src, count, res);
+	return res;
+}
+
+
+/*
+ * Clear a userspace memory
+ */
+#define __do_clear_user(addr, size)		\
+do {						\
+	int w;					\
+	asm volatile(				\
+		"	cmp 0,%0\n"		\
+		"	beq 1f\n"		\
+		"	clr %1\n"		\
+		"0:	movbu %1,(%3,%2)\n"	\
+		"	inc %3\n"		\
+		"	cmp %0,%3\n"		\
+		"	bne 0b\n"		\
+		"1:\n"				\
+		"	sub %3,%0\n"		\
+		"2:\n"				\
+		".section .fixup,\"ax\"\n"	\
+		"3:	jmp 2b\n"		\
+		".previous\n"			\
+		".section __ex_table,\"a\"\n"	\
+		"       .balign 4\n"		\
+		"       .long 0b,3b\n"		\
+		".previous\n"			\
+		: "+r"(size), "=&r"(w)		\
+		: "a"(addr), "d"(0)		\
+		: "memory", "cc");		\
+} while (0)
+
+unsigned long
+__clear_user(void *to, unsigned long n)
+{
+	__do_clear_user(to, n);
+	return n;
+}
+
+unsigned long
+clear_user(void *to, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		__do_clear_user(to, n);
+	return n;
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+long strnlen_user(const char *s, long n)
+{
+	unsigned long res, w;
+
+	if (!__addr_ok(s))
+		return 0;
+
+	if (n < 0 || n + (u_long) s > current_thread_info()->addr_limit.seg)
+		n = current_thread_info()->addr_limit.seg - (u_long)s;
+
+	asm volatile(
+		"0:	cmp %4,%0\n"
+		"	beq 2f\n"
+		"1:	movbu (%0,%3),%1\n"
+		"	inc %0\n"
+		"	cmp 0,%1\n"
+		"	beq 3f\n"
+		"	bra 0b\n"
+		"2:	clr %0\n"
+		"3:\n"
+		".section .fixup,\"ax\"\n"
+		"4:	jmp 2b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.balign 4\n"
+		"	.long 1b,4b\n"
+		".previous\n"
+		:"=d"(res), "=&r"(w)
+		:"0"(0), "a"(s), "r"(n)
+		: "memory", "cc");
+	return res;
+}
-- 
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