64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* arch/arm/include/asm/uaccess.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASMARM_UACCESS_H
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#define _ASMARM_UACCESS_H
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/*
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* User space memory access functions
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*/
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//#include <linux/string.h>
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//#include <linux/thread_info.h>
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//#include <asm/errno.h>
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//#include <asm/memory.h>
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//#include <asm/domain.h>
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//#include <asm/unified.h>
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#include "linux/compiler.h"
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#include <string.h>
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#define __range_ok(addr, size) ((void)(addr), 0)
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#define access_ok(type, addr, size) (__range_ok(addr, size) == 0)
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#define __copy_from_user(to, from, n) (memcpy(to, (void __force *)from, n), 0)
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#define __copy_to_user(to, from, n) (memcpy((void __force *)to, from, n), 0)
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#define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0)
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static inline unsigned long __must_check copy_from_user(void *to,
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const void __user *from,
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unsigned long n)
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{
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unsigned long res = n;
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if (likely(access_ok(VERIFY_READ, from, n)))
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res = __copy_from_user(to, from, n);
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if (unlikely(res))
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memset(to + (n - res), 0, res);
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return res;
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}
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static inline unsigned long __must_check copy_to_user(void __user *to,
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const void *from,
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unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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n = __copy_to_user(to, from, n);
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return n;
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}
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#define __copy_to_user_inatomic __copy_to_user
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#define __copy_from_user_inatomic __copy_from_user
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static inline unsigned long __must_check clear_user(void __user *to,
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unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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n = __clear_user(to, n);
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return n;
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}
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#endif /* _ASMARM_UACCESS_H */
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