Commit 42fd3b14 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Initial consolidation of the _32/_64 uaccess split. 



This consolidates everything but the bare assembly routines, which we
will sync up in a follow-up patch.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 31f6a11f

include/asm-sh/uaccess.h

+222 −0
Original line number Diff line number Diff line 
#ifndef __ASM_SH_UACCESS_H

#define __ASM_SH_UACCESS_H



#include <linux/errno.h>

#include <linux/sched.h>

#include <asm/segment.h>



#define VERIFY_READ    0

#define VERIFY_WRITE   1



#define __addr_ok(addr) \

	((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)



/*

 * __access_ok: Check if address with size is OK or not.

 *

 * Uhhuh, this needs 33-bit arithmetic. We have a carry..

 *

 * sum := addr + size;  carry? --> flag = true;

 * if (sum >= addr_limit) flag = true;

 */

#define __access_ok(addr, size)		\

	(__addr_ok((addr) + (size)))

#define access_ok(type, addr, size)	\

	(__chk_user_ptr(addr),		\

	 __access_ok((unsigned long __force)(addr), (size)))



/*

 * Uh, these should become the main single-value transfer routines ...

 * They automatically use the right size if we just have the right

 * pointer type ...

 *

 * As SuperH uses the same address space for kernel and user data, we

 * can just do these as direct assignments.

 *

 * Careful to not

 * (a) re-use the arguments for side effects (sizeof is ok)

 * (b) require any knowledge of processes at this stage

 */

#define put_user(x,ptr)		__put_user_check((x), (ptr), sizeof(*(ptr)))

#define get_user(x,ptr)		__get_user_check((x), (ptr), sizeof(*(ptr)))



/*

 * The "__xxx" versions do not do address space checking, useful when

 * doing multiple accesses to the same area (the user has to do the

 * checks by hand with "access_ok()")

 */

#define __put_user(x,ptr)	__put_user_nocheck((x), (ptr), sizeof(*(ptr)))

#define __get_user(x,ptr)	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))



struct __large_struct { unsigned long buf[100]; };

#define __m(x) (*(struct __large_struct __user *)(x))



#define __get_user_nocheck(x,ptr,size)				\

({								\

	long __gu_err;						\

	unsigned long __gu_val;					\

	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\

	__chk_user_ptr(ptr);					\

	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\

	(x) = (__typeof__(*(ptr)))__gu_val;			\

	__gu_err;						\

})



#define __get_user_check(x,ptr,size)					\

({									\

	long __gu_err = -EFAULT;					\

	unsigned long __gu_val = 0;					\

	const __typeof__(*(ptr)) *__gu_addr = (ptr);			\

	if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))		\

		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\

	(x) = (__typeof__(*(ptr)))__gu_val;				\

	__gu_err;							\

})



#define __put_user_nocheck(x,ptr,size)				\

({								\

	long __pu_err;						\

	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\

	__chk_user_ptr(ptr);					\

	__put_user_size((x), __pu_addr, (size), __pu_err);	\

	__pu_err;						\

})



#define __put_user_check(x,ptr,size)				\

({								\

	long __pu_err = -EFAULT;				\

	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\

	if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))	\

		__put_user_size((x), __pu_addr, (size),		\

				__pu_err);			\

	__pu_err;						\

})



#ifdef CONFIG_SUPERH32

# include "uaccess_32.h"

#else

# include "uaccess_64.h"

#endif



/* Generic arbitrary sized copy.  */

/* Return the number of bytes NOT copied */

__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);



static __always_inline unsigned long

__copy_from_user(void *to, const void __user *from, unsigned long n)

{

	return __copy_user(to, (__force void *)from, n);

}



static __always_inline unsigned long __must_check

__copy_to_user(void __user *to, const void *from, unsigned long n)

{

	return __copy_user((__force void *)to, from, n);

}



#define __copy_to_user_inatomic __copy_to_user

#define __copy_from_user_inatomic __copy_from_user



/*

 * Clear the area and return remaining number of bytes

 * (on failure.  Usually it's 0.)

 */

__kernel_size_t __clear_user(void *addr, __kernel_size_t size);



#define clear_user(addr,n)						\

({									\

	void __user * __cl_addr = (addr);				\

	unsigned long __cl_size = (n);					\

									\

	if (__cl_size && access_ok(VERIFY_WRITE,			\

		((unsigned long)(__cl_addr)), __cl_size))		\

		__cl_size = __clear_user(__cl_addr, __cl_size);		\

									\

	__cl_size;							\

})



/**

 * strncpy_from_user: - Copy a NUL terminated string from userspace.

 * @dst:   Destination address, in kernel space.  This buffer must be at

 *         least @count bytes long.

 * @src:   Source address, in user space.

 * @count: Maximum number of bytes to copy, including the trailing NUL.

 *

 * Copies a NUL-terminated string from userspace to kernel space.

 *

 * On success, returns the length of the string (not including the trailing

 * NUL).

 *

 * If access to userspace fails, returns -EFAULT (some data may have been

 * copied).

 *

 * If @count is smaller than the length of the string, copies @count bytes

 * and returns @count.

 */

#define strncpy_from_user(dest,src,count)				\

({									\

	unsigned long __sfu_src = (unsigned long)(src);			\

	int __sfu_count = (int)(count);					\

	long __sfu_res = -EFAULT;					\

									\

	if (__access_ok(__sfu_src, __sfu_count))			\

		__sfu_res = __strncpy_from_user((unsigned long)(dest),	\

				__sfu_src, __sfu_count);		\

									\

	__sfu_res;							\

})



static inline unsigned long

copy_from_user(void *to, const void __user *from, unsigned long n)

{
@@ -31,4 +190,67 @@ copy_to_user(void __user *to, const void *from, unsigned long n) 
	return __copy_size;

}



/**

 * strnlen_user: - Get the size of a string in user space.

 * @s: The string to measure.

 * @n: The maximum valid length

 *

 * Context: User context only.  This function may sleep.

 *

 * Get the size of a NUL-terminated string in user space.

 *

 * Returns the size of the string INCLUDING the terminating NUL.

 * On exception, returns 0.

 * If the string is too long, returns a value greater than @n.

 */

static inline long strnlen_user(const char __user *s, long n)

{

	if (!__addr_ok(s))

		return 0;

	else

		return __strnlen_user(s, n);

}



/**

 * strlen_user: - Get the size of a string in user space.

 * @str: The string to measure.

 *

 * Context: User context only.  This function may sleep.

 *

 * Get the size of a NUL-terminated string in user space.

 *

 * Returns the size of the string INCLUDING the terminating NUL.

 * On exception, returns 0.

 *

 * If there is a limit on the length of a valid string, you may wish to

 * consider using strnlen_user() instead.

 */

#define strlen_user(str)	strnlen_user(str, ~0UL >> 1)



/*

 * 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;

};



#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)

#define ARCH_HAS_SEARCH_EXTABLE

#endif



int fixup_exception(struct pt_regs *regs);

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

unsigned long search_exception_table(unsigned long addr);

const struct exception_table_entry *search_exception_tables(unsigned long addr);





#endif /* __ASM_SH_UACCESS_H */

include/asm-sh/uaccess_32.h

+48 −229
Original line number Diff line number Diff line
@@ -12,56 +12,6 @@ 
#ifndef __ASM_SH_UACCESS_32_H

#define __ASM_SH_UACCESS_32_H



#include <linux/errno.h>

#include <linux/sched.h>

#include <asm/segment.h>



#define VERIFY_READ    0

#define VERIFY_WRITE   1



#define __addr_ok(addr) \

	((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)



/*

 * __access_ok: Check if address with size is OK or not.

 *

 * Uhhuh, this needs 33-bit arithmetic. We have a carry..

 *

 * sum := addr + size;  carry? --> flag = true;

 * if (sum >= addr_limit) flag = true;

 */

#define __access_ok(addr, size)		\

	(__addr_ok((addr) + (size)))

#define access_ok(type, addr, size)	\

	(__chk_user_ptr(addr),		\

	 __access_ok((unsigned long __force)(addr), (size)))



/*

 * Uh, these should become the main single-value transfer routines ...

 * They automatically use the right size if we just have the right

 * pointer type ...

 *

 * As SuperH uses the same address space for kernel and user data, we

 * can just do these as direct assignments.

 *

 * Careful to not

 * (a) re-use the arguments for side effects (sizeof is ok)

 * (b) require any knowledge of processes at this stage

 */

#define put_user(x,ptr)		__put_user_check((x), (ptr), sizeof(*(ptr)))

#define get_user(x,ptr)		__get_user_check((x), (ptr), sizeof(*(ptr)))



/*

 * The "__xxx" versions do not do address space checking, useful when

 * doing multiple accesses to the same area (the user has to do the

 * checks by hand with "access_ok()")

 */

#define __put_user(x,ptr)	__put_user_nocheck((x), (ptr), sizeof(*(ptr)))

#define __get_user(x,ptr)	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))



struct __large_struct { unsigned long buf[100]; };

#define __m(x) (*(struct __large_struct __user *)(x))



#define __get_user_size(x,ptr,size,retval)			\

do {								\

	retval = 0;						\
@@ -81,28 +31,7 @@ do { \ 
	}							\

} while (0)



#define __get_user_nocheck(x,ptr,size)				\

({								\

	long __gu_err;						\

	unsigned long __gu_val;					\

	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\

	__chk_user_ptr(ptr);					\

	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\

	(x) = (__typeof__(*(ptr)))__gu_val;			\

	__gu_err;						\

})



#define __get_user_check(x,ptr,size)					\

({									\

	long __gu_err = -EFAULT;					\

	unsigned long __gu_val = 0;					\

	const __typeof__(*(ptr)) *__gu_addr = (ptr);			\

	if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))		\

		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\

	(x) = (__typeof__(*(ptr)))__gu_val;				\

	__gu_err;							\

})



#ifdef CONFIG_MMU

#define __get_user_asm(x, addr, err, insn) \

({ \

__asm__ __volatile__( \
@@ -123,6 +52,16 @@ __asm__ __volatile__( \ 
	".previous" \

	:"=&r" (err), "=&r" (x) \

	:"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })

#else

#define __get_user_asm(x, addr, err, insn)		\

do {							\

	__asm__ __volatile__ (				\

		"mov." insn "	%1, %0\n\t"		\

		: "=&r" (x)				\

		: "m" (__m(addr))			\

	);						\

} while (0)

#endif /* CONFIG_MMU */



extern void __get_user_unknown(void);
@@ -147,27 +86,9 @@ do { \ 
	}						\

} while (0)



#define __put_user_nocheck(x,ptr,size)				\

({								\

	long __pu_err;						\

	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\

	__chk_user_ptr(ptr);					\

	__put_user_size((x), __pu_addr, (size), __pu_err);	\

	__pu_err;						\

})



#define __put_user_check(x,ptr,size)				\

({								\

	long __pu_err = -EFAULT;				\

	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\

	if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))	\

		__put_user_size((x), __pu_addr, (size),		\

				__pu_err);			\

	__pu_err;						\

})



#ifdef CONFIG_MMU

#define __put_user_asm(x, addr, err, insn)			\

({ \

do {								\

	__asm__ __volatile__ (					\

		"1:\n\t"					\

		"mov." insn "	%1, %2\n\t"			\
@@ -184,8 +105,22 @@ __asm__ __volatile__( \ 
		".long	1b, 3b\n\t"				\

		".previous"					\

		: "=&r" (err)					\

	:"r" (x), "m" (__m(addr)), "i" (-EFAULT), "0" (err)	\

        :"memory"); })

		: "r" (x), "m" (__m(addr)), "i" (-EFAULT),	\

		  "0" (err)					\

		: "memory"					\

	);							\

} while (0)

#else

#define __put_user_asm(x, addr, err, insn)		\

do {							\

	__asm__ __volatile__ (				\

		"mov." insn "	%0, %1\n\t"		\

		: /* no outputs */			\

		: "r" (x), "m" (__m(addr))		\

		: "memory"				\

	);						\

} while (0)

#endif /* CONFIG_MMU */



#if defined(CONFIG_CPU_LITTLE_ENDIAN)

#define __put_user_u64(val,addr,retval) \
@@ -235,40 +170,7 @@ __asm__ __volatile__( \ 


extern void __put_user_unknown(void);



/* Generic arbitrary sized copy.  */

/* Return the number of bytes NOT copied */

__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);





static __always_inline unsigned long

__copy_from_user(void *to, const void __user *from, unsigned long n)

{

	return __copy_user(to, (__force void *)from, n);

}



static __always_inline unsigned long __must_check

__copy_to_user(void __user *to, const void *from, unsigned long n)

{

	return __copy_user((__force void *)to, from, n);

}



#define __copy_to_user_inatomic __copy_to_user

#define __copy_from_user_inatomic __copy_from_user



/*

 * Clear the area and return remaining number of bytes

 * (on failure.  Usually it's 0.)

 */

extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);



#define clear_user(addr,n) ({ \

void * __cl_addr = (addr); \

unsigned long __cl_size = (n); \

if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \

__cl_size = __clear_user(__cl_addr, __cl_size); \

__cl_size; })



static __inline__ int

static inline int

__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)

{

	__kernel_size_t res;
@@ -307,37 +209,11 @@ __strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __coun 
	return res;

}



/**

 * strncpy_from_user: - Copy a NUL terminated string from userspace.

 * @dst:   Destination address, in kernel space.  This buffer must be at

 *         least @count bytes long.

 * @src:   Source address, in user space.

 * @count: Maximum number of bytes to copy, including the trailing NUL.

 *

 * Copies a NUL-terminated string from userspace to kernel space.

 *

 * On success, returns the length of the string (not including the trailing

 * NUL).

 *

 * If access to userspace fails, returns -EFAULT (some data may have been

 * copied).

 *

 * If @count is smaller than the length of the string, copies @count bytes

 * and returns @count.

 */

#define strncpy_from_user(dest,src,count) ({ \

unsigned long __sfu_src = (unsigned long) (src); \

int __sfu_count = (int) (count); \

long __sfu_res = -EFAULT; \

if(__access_ok(__sfu_src, __sfu_count)) { \

__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \

} __sfu_res; })



/*

 * Return the size of a string (including the ending 0 even when we have

 * exceeded the maximum string length).

 */

static __inline__ long __strnlen_user(const char __user *__s, long __n)

static inline long __strnlen_user(const char __user *__s, long __n)

{

	unsigned long res;

	unsigned long __dummy;
@@ -369,61 +245,4 @@ static __inline__ long __strnlen_user(const char __user *__s, long __n) 
	return res;

}



/**

 * strnlen_user: - Get the size of a string in user space.

 * @s: The string to measure.

 * @n: The maximum valid length

 *

 * Context: User context only.  This function may sleep.

 *

 * Get the size of a NUL-terminated string in user space.

 *

 * Returns the size of the string INCLUDING the terminating NUL.

 * On exception, returns 0.

 * If the string is too long, returns a value greater than @n.

 */

static __inline__ long strnlen_user(const char __user *s, long n)

{

	if (!__addr_ok(s))

		return 0;

	else

		return __strnlen_user(s, n);

}



/**

 * strlen_user: - Get the size of a string in user space.

 * @str: The string to measure.

 *

 * Context: User context only.  This function may sleep.

 *

 * Get the size of a NUL-terminated string in user space.

 *

 * Returns the size of the string INCLUDING the terminating NUL.

 * On exception, returns 0.

 *

 * If there is a limit on the length of a valid string, you may wish to

 * consider using strnlen_user() instead.

 */

#define strlen_user(str)	strnlen_user(str, ~0UL >> 1)



/*

 * 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;

};



extern int fixup_exception(struct pt_regs *regs);



#endif /* __ASM_SH_UACCESS_32_H */

include/asm-sh/uaccess_64.h

+0 −187
Original line number Diff line number Diff line
@@ -20,68 +20,6 @@ 
 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/errno.h>

#include <linux/sched.h>



#define VERIFY_READ    0

#define VERIFY_WRITE   1



#define __addr_ok(addr) ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))



/*

 * Uhhuh, this needs 33-bit arithmetic. We have a carry..

 *

 * sum := addr + size;  carry? --> flag = true;

 * if (sum >= addr_limit) flag = true;

 */

#define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current_thread_info()->addr_limit.seg)) ? 0 : 1)



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

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



/*

 * Uh, these should become the main single-value transfer routines ...

 * They automatically use the right size if we just have the right

 * pointer type ...

 *

 * As MIPS uses the same address space for kernel and user data, we

 * can just do these as direct assignments.

 *

 * Careful to not

 * (a) re-use the arguments for side effects (sizeof is ok)

 * (b) require any knowledge of processes at this stage

 */

#define put_user(x,ptr)	__put_user_check((x),(ptr),sizeof(*(ptr)))

#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))



/*

 * The "__xxx" versions do not do address space checking, useful when

 * doing multiple accesses to the same area (the user has to do the

 * checks by hand with "access_ok()")

 */

#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))

#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))



/*

 * The "xxx_ret" versions return constant specified in third argument, if

 * something bad happens. These macros can be optimized for the

 * case of just returning from the function xxx_ret is used.

 */



#define put_user_ret(x,ptr,ret) ({ \

if (put_user(x,ptr)) return ret; })



#define get_user_ret(x,ptr,ret) ({ \

if (get_user(x,ptr)) return ret; })



#define __put_user_ret(x,ptr,ret) ({ \

if (__put_user(x,ptr)) return ret; })



#define __get_user_ret(x,ptr,ret) ({ \

if (__get_user(x,ptr)) return ret; })



struct __large_struct { unsigned long buf[100]; };

#define __m(x) (*(struct __large_struct *)(x))



#define __get_user_size(x,ptr,size,retval)			\

do {								\
@@ -105,26 +43,6 @@ do { \ 
	}							\

} while (0)



#define __get_user_nocheck(x,ptr,size)				\

({								\

	long __gu_err, __gu_val;				\

	__get_user_size((void *)&__gu_val, (long)(ptr),		\

			(size), __gu_err);			\

	(x) = (__typeof__(*(ptr)))__gu_val;			\

	__gu_err;						\

})



#define __get_user_check(x,ptr,size)				\

({								\

	long __gu_addr = (long)(ptr);				\

	long __gu_err = -EFAULT, __gu_val;			\

	if (__access_ok(__gu_addr, (size)))			\

		__get_user_size((void *)&__gu_val, __gu_addr,	\

				(size), __gu_err);		\

	(x) = (__typeof__(*(ptr))) __gu_val;			\

	__gu_err;						\

})



extern long __get_user_asm_b(void *, long);

extern long __get_user_asm_w(void *, long);

extern long __get_user_asm_l(void *, long);
@@ -152,115 +70,10 @@ do { \ 
	}							\

} while (0)



#define __put_user_nocheck(x,ptr,size)				\

({								\

	long __pu_err;						\

	__typeof__(*(ptr)) __pu_val = (x);			\

	__put_user_size((void *)&__pu_val, (long)(ptr), (size), __pu_err); \

	__pu_err;						\

})



#define __put_user_check(x,ptr,size)				\

({								\

	long __pu_err = -EFAULT;				\

	long __pu_addr = (long)(ptr);				\

	__typeof__(*(ptr)) __pu_val = (x);			\

								\

	if (__access_ok(__pu_addr, (size)))			\

		__put_user_size((void *)&__pu_val, __pu_addr, (size), __pu_err);\

	__pu_err;						\

})



extern long __put_user_asm_b(void *, long);

extern long __put_user_asm_w(void *, long);

extern long __put_user_asm_l(void *, long);

extern long __put_user_asm_q(void *, long);

extern void __put_user_unknown(void);





/* Generic arbitrary sized copy.  */

/* Return the number of bytes NOT copied */

/* XXX: should be such that: 4byte and the rest. */

extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n);



#define copy_to_user_ret(to,from,n,retval) ({ \

if (copy_to_user(to,from,n)) \

	return retval; \

})



#define __copy_to_user(to,from,n)		\

	__copy_user((void *)(to),		\

		    (void *)(from), n)



#define __copy_to_user_ret(to,from,n,retval) ({ \

if (__copy_to_user(to,from,n)) \

	return retval; \

})



#define copy_from_user_ret(to,from,n,retval) ({ \

if (copy_from_user(to,from,n)) \

	return retval; \

})



#define __copy_from_user(to,from,n)		\

	__copy_user((void *)(to),		\

		    (void *)(from), n)



#define __copy_from_user_ret(to,from,n,retval) ({ \

if (__copy_from_user(to,from,n)) \

	return retval; \

})



#define __copy_to_user_inatomic __copy_to_user

#define __copy_from_user_inatomic __copy_from_user



/* XXX: Not sure it works well..

   should be such that: 4byte clear and the rest. */

extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);



#define clear_user(addr,n) ({ \

void * __cl_addr = (addr); \

unsigned long __cl_size = (n); \

if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \

__cl_size = __clear_user(__cl_addr, __cl_size); \

__cl_size; })



extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count);



#define strncpy_from_user(dest,src,count) ({ \

unsigned long __sfu_src = (unsigned long) (src); \

int __sfu_count = (int) (count); \

long __sfu_res = -EFAULT; \

if(__access_ok(__sfu_src, __sfu_count)) { \

__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \

} __sfu_res; })



#define strlen_user(str) strnlen_user(str, ~0UL >> 1)



/*

 * Return the size of a string (including the ending 0!)

 */

extern long __strnlen_user(const char *__s, long __n);



static inline long strnlen_user(const char *s, long n)

{

	if (!__addr_ok(s))

		return 0;

	else

		return __strnlen_user(s, n);

}



struct exception_table_entry

{

	unsigned long insn, fixup;

};



#ifdef CONFIG_MMU

#define ARCH_HAS_SEARCH_EXTABLE

#endif



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

extern unsigned long search_exception_table(unsigned long addr);

extern const struct exception_table_entry *search_exception_tables (unsigned long addr);



#endif /* __ASM_SH_UACCESS_64_H */