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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)
- {
- char *end = (char *)to + n;
- if (access_ok(VERIFY_READ, from, n)) {
- __do_copy_from_user(to, from, n);
- if (n) memset(end - n, 0, 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 */
-