microblaze_v8: uaccess files

/*

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * 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.

 */

#ifndef _ASM_MICROBLAZE_UACCESS_H

#define _ASM_MICROBLAZE_UACCESS_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/sched.h> /* RLIMIT_FSIZE */

#include <linux/mm.h>

#include <asm/mmu.h>

#include <asm/page.h>

#include <asm/pgtable.h>

#include <asm/segment.h>

#include <linux/string.h>

#define VERIFY_READ	0

#define VERIFY_WRITE	1

extern int ___range_ok(unsigned long addr, unsigned long size);

#define __range_ok(addr, size) \

		___range_ok((unsigned long)(addr), (unsigned long)(size))

#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)

#define __access_ok(add, size) (__range_ok((addr), (size)) == 0)

extern inline int bad_user_access_length(void)

{

	return 0;

}

/* FIXME this is function for optimalization -> memcpy */

#define __get_user(var, ptr)					\

	({							\

		int __gu_err = 0;				\

		switch (sizeof(*(ptr))) {			\

		case 1:						\

		case 2:						\

		case 4:						\

			(var) = *(ptr);				\

			break;					\

		case 8:						\

			memcpy((void *) &(var), (ptr), 8);	\

			break;					\

		default:					\

			(var) = 0;				\

			__gu_err = __get_user_bad();		\

			break;					\

		}						\

		__gu_err;					\

	})

#define __get_user_bad()	(bad_user_access_length(), (-EFAULT))

#define __put_user(var, ptr)					\

	({							\

		int __pu_err = 0;				\

		switch (sizeof(*(ptr))) {			\

		case 1:						\

		case 2:						\

		case 4:						\

			*(ptr) = (var);				\

			break;					\

		case 8: {					\

			typeof(*(ptr)) __pu_val = var;		\

			memcpy(ptr, &__pu_val, sizeof(__pu_val));\

			}					\

			break;					\

		default:					\

			__pu_err = __put_user_bad();		\

			break;					\

		}							\

		__pu_err;						\

	})

#define __put_user_bad()	(bad_user_access_length(), (-EFAULT))

#define put_user(x, ptr)	__put_user(x, ptr)

#define get_user(x, ptr)	__get_user(x, ptr)

#define copy_to_user(to, from, n)		(memcpy(to, from, n), 0)

#define copy_from_user(to, from, n)		(memcpy(to, from, n), 0)

#define __copy_to_user(to, from, n)		(copy_to_user(to, from, n))

#define __copy_from_user(to, from, n)		(copy_from_user(to, from, n))

#define __copy_to_user_inatomic(to, from, n)	(__copy_to_user(to, from, n))

#define __copy_from_user_inatomic(to, from, n)	(__copy_from_user(to, from, n))

#define __clear_user(addr, n)	(memset((void *)addr, 0, n), 0)

static inline unsigned long clear_user(void *addr, unsigned long size)

{

	if (access_ok(VERIFY_WRITE, addr, size))

		size = __clear_user(addr, size);

	return size;

}

/* Returns 0 if exception not found and fixup otherwise. */

extern unsigned long search_exception_table(unsigned long);

extern long strncpy_from_user(char *dst, const char __user *src, long count);

extern long strnlen_user(const char __user *src, long count);

extern long __strncpy_from_user(char *dst, const char __user *src, long count);

/*

 * The exception table consists of pairs of addresses: the first is the

 * address of an instruction that is allowed to fault, and the second is

 * the address at which the program should continue. No registers are

 * modified, so it is entirely up to the continuation code to figure out

 * what to do.

 *

 * All the routines below use bits of fixup code that are out of line

 * with the main instruction path. This means when everything is well,

 * we don't even have to jump over them. Further, they do not intrude

 * on our cache or tlb entries.

 */

struct exception_table_entry {

	unsigned long insn, fixup;

};

#endif  /* __ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* _ASM_MICROBLAZE_UACCESS_H */

/*

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * 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.

 */

#include <linux/string.h>

#include <asm/uaccess.h>

#include <asm/bug.h>

long strnlen_user(const char __user *src, long count)

{

	return strlen(src) + 1;

}

#define __do_strncpy_from_user(dst, src, count, res)			\

	do {								\

		char *tmp;						\

		strncpy(dst, src, count);				\

		for (tmp = dst; *tmp && count > 0; tmp++, count--)	\

			;						\

		res = (tmp - dst);					\

	} while (0)

long __strncpy_from_user(char *dst, const char __user *src, long count)

{

	long res;

	__do_strncpy_from_user(dst, src, count, res);

	return res;

}

long strncpy_from_user(char *dst, const char __user *src, long count)

{

	long res = -EFAULT;

	if (access_ok(VERIFY_READ, src, 1))

		__do_strncpy_from_user(dst, src, count, res);

	return res;

}