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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-sh64/] [uaccess.h] - Blame information for rev 1765

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1 1276 phoenix
#ifndef __ASM_SH64_UACCESS_H
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#define __ASM_SH64_UACCESS_H
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/*
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 * This file is subject to the terms and conditions of the GNU General Public
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 * License.  See the file "COPYING" in the main directory of this archive
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 * for more details.
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 *
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 * include/asm-sh64/uaccess.h
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 *
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 * Copyright (C) 2000, 2001  Paolo Alberelli
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 *
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 * User space memory access functions
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 *
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 * Copyright (C) 1999  Niibe Yutaka
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 *
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 *  Based on:
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 *     MIPS implementation version 1.15 by
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 *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
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 *     and i386 version.
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 *
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 */
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#include <linux/errno.h>
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#include <linux/sched.h>
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#define VERIFY_READ    0
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#define VERIFY_WRITE   1
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/*
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 * The fs value determines whether argument validity checking should be
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 * performed or not.  If get_fs() == USER_DS, checking is performed, with
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 * get_fs() == KERNEL_DS, checking is bypassed.
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 *
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 * For historical reasons (Data Segment Register?), these macros are misnamed.
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 */
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#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
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#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
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#define USER_DS         MAKE_MM_SEG(0x80000000)
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#define get_ds()        (KERNEL_DS)
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#define get_fs()        (current->addr_limit)
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#define set_fs(x)       (current->addr_limit=(x))
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#define segment_eq(a,b) ((a).seg == (b).seg)
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#define __addr_ok(addr) ((unsigned long)(addr) < (current->addr_limit.seg))
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/*
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 * Uhhuh, this needs 33-bit arithmetic. We have a carry..
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 *
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 * sum := addr + size;  carry? --> flag = true;
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 * if (sum >= addr_limit) flag = true;
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 */
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#define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current->addr_limit.seg)) ? 0 : 1)
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#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
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#define __access_ok(addr,size) (__range_ok(addr,size) == 0)
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extern inline int verify_area(int type, const void * addr, unsigned long size)
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{
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        return access_ok(type,addr,size) ? 0 : -EFAULT;
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}
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/*
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 * Uh, these should become the main single-value transfer routines ...
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 * They automatically use the right size if we just have the right
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 * pointer type ...
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 *
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 * As MIPS uses the same address space for kernel and user data, we
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 * can just do these as direct assignments.
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 *
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 * Careful to not
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 * (a) re-use the arguments for side effects (sizeof is ok)
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 * (b) require any knowledge of processes at this stage
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 */
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#define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr)))
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#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)))
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/*
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 * The "__xxx" versions do not do address space checking, useful when
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 * doing multiple accesses to the same area (the user has to do the
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 * checks by hand with "access_ok()")
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 */
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#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr)))
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#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
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/*
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 * The "xxx_ret" versions return constant specified in third argument, if
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 * something bad happens. These macros can be optimized for the
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 * case of just returning from the function xxx_ret is used.
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 */
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#define put_user_ret(x,ptr,ret) ({ \
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if (put_user(x,ptr)) return ret; })
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#define get_user_ret(x,ptr,ret) ({ \
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if (get_user(x,ptr)) return ret; })
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#define __put_user_ret(x,ptr,ret) ({ \
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if (__put_user(x,ptr)) return ret; })
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#define __get_user_ret(x,ptr,ret) ({ \
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if (__get_user(x,ptr)) return ret; })
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct *)(x))
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#define __get_user_nocheck(x,ptr,size) ({ \
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long __gu_err; \
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__typeof(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__asm__("":"=r" (__gu_err)); \
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__gu_addr = (long) (ptr); \
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switch (size) { \
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case 1: __gu_err = __get_user_asm_b((void *) &__gu_val, __gu_addr); break; \
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case 2: __gu_err = __get_user_asm_w((void *) &__gu_val, __gu_addr); break; \
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case 4: __gu_err = __get_user_asm_l((void *) &__gu_val, __gu_addr); break; \
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case 8: __gu_err = __get_user_asm_q((void *) &__gu_val, __gu_addr); break; \
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default: __get_user_unknown(); break; \
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} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
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#define __get_user_check(x,ptr,size) ({ \
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long __gu_err; \
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__typeof(*(ptr)) __gu_val; \
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long __gu_addr; \
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__asm__("":"=r" (__gu_val)); \
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__asm__("":"=r" (__gu_err)); \
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__gu_addr = (long) (ptr); \
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if (__access_ok(__gu_addr,size)) { \
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switch (size) { \
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case 1: __gu_err = __get_user_asm_b((void *) &__gu_val, __gu_addr); break; \
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case 2: __gu_err = __get_user_asm_w((void *) &__gu_val, __gu_addr); break; \
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case 4: __gu_err = __get_user_asm_l((void *) &__gu_val, __gu_addr); break; \
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case 8: __gu_err = __get_user_asm_q((void *) &__gu_val, __gu_addr); break; \
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default: __get_user_unknown(); break; \
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} } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
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142
extern long __get_user_asm_b(void *, long);
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extern long __get_user_asm_w(void *, long);
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extern long __get_user_asm_l(void *, long);
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extern long __get_user_asm_q(void *, long);
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extern void __get_user_unknown(void);
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148
#define __put_user_nocheck(x,ptr,size) ({ \
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
151
long __pu_addr; \
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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__asm__("":"=r" (__pu_err)); \
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switch (size) { \
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case 1: __pu_err = __put_user_asm_b((void *) &__pu_val, __pu_addr); break; \
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case 2: __pu_err = __put_user_asm_w((void *) &__pu_val, __pu_addr); break; \
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case 4: __pu_err = __put_user_asm_l((void *) &__pu_val, __pu_addr); break; \
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case 8: __pu_err = __put_user_asm_q((void *) &__pu_val, __pu_addr); break; \
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default: __put_user_unknown(); break; \
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} __pu_err; })
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163
#define __put_user_check(x,ptr,size) ({ \
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long __pu_err; \
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__typeof__(*(ptr)) __pu_val; \
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long __pu_addr; \
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__pu_val = (x); \
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__pu_addr = (long) (ptr); \
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__asm__("":"=r" (__pu_err)); \
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if (__access_ok(__pu_addr,size)) { \
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switch (size) { \
172
case 1: __pu_err = __put_user_asm_b((void *) &__pu_val, __pu_addr); break; \
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case 2: __pu_err = __put_user_asm_w((void *) &__pu_val, __pu_addr); break; \
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case 4: __pu_err = __put_user_asm_l((void *) &__pu_val, __pu_addr); break; \
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case 8: __pu_err = __put_user_asm_q((void *) &__pu_val, __pu_addr); break; \
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default: __put_user_unknown(); break; \
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} } __pu_err; })
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extern long __put_user_asm_b(void *, long);
180
extern long __put_user_asm_w(void *, long);
181
extern long __put_user_asm_l(void *, long);
182
extern long __put_user_asm_q(void *, long);
183
extern void __put_user_unknown(void);
184
 
185
 
186
/* Generic arbitrary sized copy.  */
187
/* Return the number of bytes NOT copied */
188
/* XXX: should be such that: 4byte and the rest. */
189
extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n);
190
 
191
#define copy_to_user(to,from,n) ({ \
192
void *__copy_to = (void *) (to); \
193
__kernel_size_t __copy_size = (__kernel_size_t) (n); \
194
__kernel_size_t __copy_res; \
195
if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \
196
__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \
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} else __copy_res = __copy_size; \
198
__copy_res; })
199
 
200
#define copy_to_user_ret(to,from,n,retval) ({ \
201
if (copy_to_user(to,from,n)) \
202
        return retval; \
203
})
204
 
205
#define __copy_to_user(to,from,n)               \
206
        __copy_user((void *)(to),               \
207
                    (void *)(from), n)
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209
#define __copy_to_user_ret(to,from,n,retval) ({ \
210
if (__copy_to_user(to,from,n)) \
211
        return retval; \
212
})
213
 
214
#define copy_from_user(to,from,n) ({ \
215
void *__copy_to = (void *) (to); \
216
void *__copy_from = (void *) (from); \
217
__kernel_size_t __copy_size = (__kernel_size_t) (n); \
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__kernel_size_t __copy_res; \
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if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \
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__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \
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} else __copy_res = __copy_size; \
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__copy_res; })
223
 
224
#define copy_from_user_ret(to,from,n,retval) ({ \
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if (copy_from_user(to,from,n)) \
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        return retval; \
227
})
228
 
229
#define __copy_from_user(to,from,n)             \
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        __copy_user((void *)(to),               \
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                    (void *)(from), n)
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233
#define __copy_from_user_ret(to,from,n,retval) ({ \
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if (__copy_from_user(to,from,n)) \
235
        return retval; \
236
})
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238
/* XXX: Not sure it works well..
239
   should be such that: 4byte clear and the rest. */
240
extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
241
 
242
#define clear_user(addr,n) ({ \
243
void * __cl_addr = (addr); \
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unsigned long __cl_size = (n); \
245
if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
246
__cl_size = __clear_user(__cl_addr, __cl_size); \
247
__cl_size; })
248
 
249
extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count);
250
 
251
#define strncpy_from_user(dest,src,count) ({ \
252
unsigned long __sfu_src = (unsigned long) (src); \
253
int __sfu_count = (int) (count); \
254
long __sfu_res = -EFAULT; \
255
if(__access_ok(__sfu_src, __sfu_count)) { \
256
__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
257
} __sfu_res; })
258
 
259
#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
260
 
261
/*
262
 * Return the size of a string (including the ending 0!)
263
 */
264
extern long __strnlen_user(const char *__s, long __n);
265
 
266
extern __inline__ long strnlen_user(const char *s, long n)
267
{
268
        if (!__addr_ok(s))
269
                return 0;
270
        else
271
                return __strnlen_user(s, n);
272
}
273
 
274
struct exception_table_entry
275
{
276
        unsigned long insn, fixup;
277
};
278
 
279
/* Returns 0 if exception not found and fixup.unit otherwise.  */
280
extern unsigned long search_exception_table(unsigned long addr);
281
 
282
/* Returns the new pc */
283
#define fixup_exception(map_reg, fixup_unit, pc)                \
284
({                                                              \
285
        fixup_unit;                                             \
286
})
287
 
288
#endif /* __ASM_SH64_UACCESS_H */

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