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#ifndef _ASMARM_UACCESS_H
#define _ASMARM_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/sched.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 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;
};
/* Returns 0 if exception not found and fixup otherwise. */
extern unsigned long search_exception_table(unsigned long);
#include <asm/proc/uaccess.h>
extern inline int verify_area(int type, const void * addr, unsigned long size)
{
return access_ok(type,addr,size) ? 0 : -EFAULT;
}
/*
* Single-value transfer routines. They automatically use the right
* size if we just have the right pointer type.
*
* The "__xxx" versions of the user access functions do not verify the
* address space - it must have been done previously with a separate
* "access_ok()" call.
*
* The "xxx_ret" versions return constant specified in the third
* argument if something bad happens.
*/
#define get_user(x,p) __get_user_check((x),(p),sizeof(*(p)))
#define __get_user(x,p) __get_user_nocheck((x),(p),sizeof(*(p)))
#define get_user_ret(x,p,r) ({ if (get_user(x,p)) return r; })
#define __get_user_ret(x,p,r) ({ if (__get_user(x,p)) return r; })
#define put_user(x,p) __put_user_check((__typeof(*(p)))(x),(p),sizeof(*(p)))
#define __put_user(x,p) __put_user_nocheck((__typeof(*(p)))(x),(p),sizeof(*(p)))
#define put_user_ret(x,p,r) ({ if (put_user(x,p)) return r; })
#define __put_user_ret(x,p,r) ({ if (__put_user(x,p)) return r; })
static __inline__ unsigned long copy_from_user(void *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_READ, from, n))
__do_copy_from_user(to, from, n);
return n;
}
static __inline__ unsigned long __copy_from_user(void *to, const void *from, unsigned long n)
{
__do_copy_from_user(to, from, n);
return n;
}
#define copy_from_user_ret(t,f,n,r) \
({ if (copy_from_user(t,f,n)) return r; })
static __inline__ unsigned long copy_to_user(void *to, const void *from, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
__do_copy_to_user(to, from, n);
return n;
}
static __inline__ unsigned long __copy_to_user(void *to, const void *from, unsigned long n)
{
__do_copy_to_user(to, from, n);
return n;
}
#define copy_to_user_ret(t,f,n,r) \
({ if (copy_to_user(t,f,n)) return r; })
static __inline__ unsigned long clear_user (void *to, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n))
__do_clear_user(to, n);
return n;
}
static __inline__ unsigned long __clear_user (void *to, unsigned long n)
{
__do_clear_user(to, n);
return n;
}
static __inline__ 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;
}
static __inline__ long __strncpy_from_user (char *dst, const char *src, long count)
{
long res;
__do_strncpy_from_user(dst, src, count, res);
return res;
}
extern __inline__ long strlen_user (const char *s)
{
unsigned long res = 0;
if (__addr_ok(s))
__do_strlen_user (s, res);
return res;
}
/*
* These are the work horses of the get/put_user functions
*/
#define __get_user_check(x,ptr,size) \
({ \
long __gu_err = -EFAULT, __gu_val = 0; \
const __typeof__(*(ptr)) *__gu_addr = (ptr); \
if (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 __get_user_nocheck(x,ptr,size) \
({ \
long __gu_err = 0, __gu_val = 0; \
__get_user_size(__gu_val,(ptr),(size),__gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __put_user_check(x,ptr,size) \
({ \
long __pu_err = -EFAULT; \
__typeof__(*(ptr)) *__pu_addr = (ptr); \
if (access_ok(VERIFY_WRITE,__pu_addr,size)) \
__put_user_size((x),__pu_addr,(size),__pu_err); \
__pu_err; \
})
#define __put_user_nocheck(x,ptr,size) \
({ \
long __pu_err = 0; \
__put_user_size((x),(ptr),(size),__pu_err); \
__pu_err; \
})
extern long __get_user_bad(void);
#define __get_user_size(x,ptr,size,retval) \
do { \
retval = 0; \
switch (size) { \
case 1: __get_user_asm_byte(x,ptr,retval); break; \
case 2: __get_user_asm_half(x,ptr,retval); break; \
case 4: __get_user_asm_word(x,ptr,retval); break; \
default: (x) = __get_user_bad(); \
} \
} while (0)
extern long __put_user_bad(void);
#define __put_user_size(x,ptr,size,retval) \
do { \
retval = 0; \
switch (size) { \
case 1: __put_user_asm_byte(x,ptr,retval); break; \
case 2: __put_user_asm_half(x,ptr,retval); break; \
case 4: __put_user_asm_word(x,ptr,retval); break; \
default: __put_user_bad(); \
} \
} while (0)
#endif /* _ASMARM_UACCESS_H */
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