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#ifndef __ASM_SH64_UACCESS_H

#define __ASM_SH64_UACCESS_H

/*

 * 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/asm-sh64/uaccess.h

 *

 * Copyright (C) 2000, 2001  Paolo Alberelli

 *

 * User space memory access functions

 *

 * Copyright (C) 1999  Niibe Yutaka

 *

 *  Based on:

 *     MIPS implementation version 1.15 by

 *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle

 *     and i386 version.

 *

 */

#include <linux/errno.h>

#include <linux/sched.h>

#define VERIFY_READ    0

#define VERIFY_WRITE   1

/*

 * The fs value determines whether argument validity checking should be

 * performed or not.  If get_fs() == USER_DS, checking is performed, with

 * get_fs() == KERNEL_DS, checking is bypassed.

 *

 * For historical reasons (Data Segment Register?), these macros are misnamed.

 */

#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })

#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)

#define USER_DS         MAKE_MM_SEG(0x80000000)

#define get_ds()        (KERNEL_DS)

#define get_fs()        (current->addr_limit)

#define set_fs(x)       (current->addr_limit=(x))

#define segment_eq(a,b) ((a).seg == (b).seg)

#define __addr_ok(addr) ((unsigned long)(addr) < (current->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->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)

extern inline int verify_area(int type, const void * addr, unsigned long size)

{

        return access_ok(type,addr,size) ? 0 : -EFAULT;

}

/*

 * 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_nocheck(x,ptr,size) ({ \

long __gu_err; \

__typeof(*(ptr)) __gu_val; \

long __gu_addr; \

__asm__("":"=r" (__gu_val)); \

__asm__("":"=r" (__gu_err)); \

__gu_addr = (long) (ptr); \

switch (size) { \

case 1: __gu_err = __get_user_asm_b((void *) &__gu_val, __gu_addr); break; \

case 2: __gu_err = __get_user_asm_w((void *) &__gu_val, __gu_addr); break; \

case 4: __gu_err = __get_user_asm_l((void *) &__gu_val, __gu_addr); break; \

case 8: __gu_err = __get_user_asm_q((void *) &__gu_val, __gu_addr); break; \

default: __get_user_unknown(); break; \

} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })

#define __get_user_check(x,ptr,size) ({ \

long __gu_err; \

__typeof(*(ptr)) __gu_val; \

long __gu_addr; \

__asm__("":"=r" (__gu_val)); \

__asm__("":"=r" (__gu_err)); \

__gu_addr = (long) (ptr); \

if (__access_ok(__gu_addr,size)) { \

switch (size) { \

case 1: __gu_err = __get_user_asm_b((void *) &__gu_val, __gu_addr); break; \

case 2: __gu_err = __get_user_asm_w((void *) &__gu_val, __gu_addr); break; \

case 4: __gu_err = __get_user_asm_l((void *) &__gu_val, __gu_addr); break; \

case 8: __gu_err = __get_user_asm_q((void *) &__gu_val, __gu_addr); break; \

default: __get_user_unknown(); break; \

} } 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);

extern long __get_user_asm_q(void *, long);

extern void __get_user_unknown(void);

#define __put_user_nocheck(x,ptr,size) ({ \

long __pu_err; \

__typeof__(*(ptr)) __pu_val; \

long __pu_addr; \

__pu_val = (x); \

__pu_addr = (long) (ptr); \

__asm__("":"=r" (__pu_err)); \

switch (size) { \

case 1: __pu_err = __put_user_asm_b((void *) &__pu_val, __pu_addr); break; \

case 2: __pu_err = __put_user_asm_w((void *) &__pu_val, __pu_addr); break; \

case 4: __pu_err = __put_user_asm_l((void *) &__pu_val, __pu_addr); break; \

case 8: __pu_err = __put_user_asm_q((void *) &__pu_val, __pu_addr); break; \

default: __put_user_unknown(); break; \

} __pu_err; })

#define __put_user_check(x,ptr,size) ({ \

long __pu_err; \

__typeof__(*(ptr)) __pu_val; \

long __pu_addr; \

__pu_val = (x); \

__pu_addr = (long) (ptr); \

__asm__("":"=r" (__pu_err)); \

if (__access_ok(__pu_addr,size)) { \

switch (size) { \

case 1: __pu_err = __put_user_asm_b((void *) &__pu_val, __pu_addr); break; \

case 2: __pu_err = __put_user_asm_w((void *) &__pu_val, __pu_addr); break; \

case 4: __pu_err = __put_user_asm_l((void *) &__pu_val, __pu_addr); break; \

case 8: __pu_err = __put_user_asm_q((void *) &__pu_val, __pu_addr); break; \

default: __put_user_unknown(); break; \

} } __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(to,from,n) ({ \

void *__copy_to = (void *) (to); \

__kernel_size_t __copy_size = (__kernel_size_t) (n); \

__kernel_size_t __copy_res; \

if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \

__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \

} else __copy_res = __copy_size; \

__copy_res; })

#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(to,from,n) ({ \

void *__copy_to = (void *) (to); \

void *__copy_from = (void *) (from); \

__kernel_size_t __copy_size = (__kernel_size_t) (n); \

__kernel_size_t __copy_res; \

if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \

__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \

} else __copy_res = __copy_size; \

__copy_res; })

#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; \

})

/* 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);

extern __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;

};

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

extern unsigned long search_exception_table(unsigned long addr);

/* Returns the new pc */

#define fixup_exception(map_reg, fixup_unit, pc)                \

({                                                              \

        fixup_unit;                                             \

})

#endif /* __ASM_SH64_UACCESS_H */