[linux-2.6-block.git] / arch / microblaze / include / asm / 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.
 */

#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)

/* Undefined function to trigger linker error */
extern int bad_user_access_length(void);

/* 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 */
Commit	Line	Data
2660663f MS	1	/*
	2	* Copyright (C) 2006 Atmark Techno, Inc.
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*/
	8
	9	#ifndef _ASM_MICROBLAZE_UACCESS_H
	10	#define _ASM_MICROBLAZE_UACCESS_H
	11
	12	#ifdef __KERNEL__
	13	#ifndef __ASSEMBLY__
	14
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/sched.h> /* RLIMIT_FSIZE */
	18	#include <linux/mm.h>
	19
	20	#include <asm/mmu.h>
	21	#include <asm/page.h>
	22	#include <asm/pgtable.h>
	23	#include <asm/segment.h>
	24	#include <linux/string.h>
	25
	26	#define VERIFY_READ 0
	27	#define VERIFY_WRITE 1
	28
	29	extern int ___range_ok(unsigned long addr, unsigned long size);
	30
	31	#define __range_ok(addr, size) \
	32	___range_ok((unsigned long)(addr), (unsigned long)(size))
	33
	34	#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
	35	#define __access_ok(add, size) (__range_ok((addr), (size)) == 0)
	36
838d2406 AB	37	/* Undefined function to trigger linker error */
	38	extern int bad_user_access_length(void);
	39
2660663f MS	40	/* FIXME this is function for optimalization -> memcpy */
	41	#define __get_user(var, ptr) \
	42	({ \
	43	int __gu_err = 0; \
	44	switch (sizeof(*(ptr))) { \
	45	case 1: \
	46	case 2: \
	47	case 4: \
	48	(var) = *(ptr); \
	49	break; \
	50	case 8: \
	51	memcpy((void *) &(var), (ptr), 8); \
	52	break; \
	53	default: \
	54	(var) = 0; \
	55	__gu_err = __get_user_bad(); \
	56	break; \
	57	} \
	58	__gu_err; \
	59	})
	60
	61	#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
	62
	63	#define __put_user(var, ptr) \
	64	({ \
	65	int __pu_err = 0; \
	66	switch (sizeof(*(ptr))) { \
	67	case 1: \
	68	case 2: \
	69	case 4: \
	70	*(ptr) = (var); \
	71	break; \
	72	case 8: { \
	73	typeof(*(ptr)) __pu_val = var; \
	74	memcpy(ptr, &__pu_val, sizeof(__pu_val));\
	75	} \
	76	break; \
	77	default: \
	78	__pu_err = __put_user_bad(); \
	79	break; \
	80	} \
	81	__pu_err; \
	82	})
	83
	84	#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
	85
	86	#define put_user(x, ptr) __put_user(x, ptr)
	87	#define get_user(x, ptr) __get_user(x, ptr)
	88
	89	#define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
	90	#define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
	91
	92	#define __copy_to_user(to, from, n) (copy_to_user(to, from, n))
	93	#define __copy_from_user(to, from, n) (copy_from_user(to, from, n))
	94	#define __copy_to_user_inatomic(to, from, n) (__copy_to_user(to, from, n))
	95	#define __copy_from_user_inatomic(to, from, n) (__copy_from_user(to, from, n))
	96
	97	#define __clear_user(addr, n) (memset((void *)addr, 0, n), 0)
	98
	99	static inline unsigned long clear_user(void *addr, unsigned long size)
	100	{
	101	if (access_ok(VERIFY_WRITE, addr, size))
	102	size = __clear_user(addr, size);
	103	return size;
104	}
105
106	/* Returns 0 if exception not found and fixup otherwise. */
107	extern unsigned long search_exception_table(unsigned long);
108
109
110	extern long strncpy_from_user(char dst, const char __user src, long count);
111	extern long strnlen_user(const char __user *src, long count);
112	extern long __strncpy_from_user(char dst, const char __user src, long count);
113
114	/*
115	* The exception table consists of pairs of addresses: the first is the
116	* address of an instruction that is allowed to fault, and the second is
117	* the address at which the program should continue. No registers are
118	* modified, so it is entirely up to the continuation code to figure out
119	* what to do.
120	*
121	* All the routines below use bits of fixup code that are out of line
122	* with the main instruction path. This means when everything is well,
123	* we don't even have to jump over them. Further, they do not intrude
124	* on our cache or tlb entries.
125	*/
126	struct exception_table_entry {
127	unsigned long insn, fixup;
128	};
129
130	#endif /* __ASSEMBLY__ */
131	#endif /* __KERNEL__ */
132
133	#endif /* _ASM_MICROBLAZE_UACCESS_H */