root/include/asm-um/uaccess.h

INCLUDED FROM

/* 
 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#ifndef __UM_UACCESS_H
#define __UM_UACCESS_H

#include <asm/errno.h>
#include <asm/processor.h>

/* thread_info has a mm_segment_t in it, so put the definition up here */
typedef struct {
        unsigned long seg;
} mm_segment_t;

#include "linux/thread_info.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, these macros are grossly misnamed.
 */

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

#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
#define USER_DS         MAKE_MM_SEG(TASK_SIZE)

#define get_ds()        (KERNEL_DS)
#define get_fs()        (current_thread_info()->addr_limit)
#define set_fs(x)       (current_thread_info()->addr_limit = (x))

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

#include "um_uaccess.h"

#define __copy_from_user(to, from, n) copy_from_user(to, from, n)

#define __copy_to_user(to, from, n) copy_to_user(to, from, n)

#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user

#define __get_user(x, ptr) \
({ \
        const __typeof__(*(ptr)) __user *__private_ptr = (ptr); \
        __typeof__(x) __private_val;                    \
        int __private_ret = -EFAULT;                    \
        (x) = (__typeof__(*(__private_ptr)))0;                          \
        if (__copy_from_user((__force void *)&__private_val, (__private_ptr),\
                             sizeof(*(__private_ptr))) == 0) {          \
                (x) = (__typeof__(*(__private_ptr))) __private_val;     \
                __private_ret = 0;                                      \
        }                                                               \
        __private_ret;                                                  \
}) 

#define get_user(x, ptr) \
({ \
        const __typeof__((*(ptr))) __user *private_ptr = (ptr); \
        (access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \
         __get_user(x, private_ptr) : ((x) = (__typeof__(*ptr))0, -EFAULT)); \
})

#define __put_user(x, ptr) \
({ \
        __typeof__(*(ptr)) __user *__private_ptr = ptr; \
        __typeof__(*(__private_ptr)) __private_val; \
        int __private_ret = -EFAULT; \
        __private_val = (__typeof__(*(__private_ptr))) (x); \
        if (__copy_to_user((__private_ptr), &__private_val, \
                           sizeof(*(__private_ptr))) == 0) { \
                __private_ret = 0; \
        } \
        __private_ret; \
})

#define put_user(x, ptr) \
({ \
        __typeof__(*(ptr)) __user *private_ptr = (ptr); \
        (access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \
         __put_user(x, private_ptr) : -EFAULT); \
})

#define strlen_user(str) strnlen_user(str, ~0U >> 1)

struct exception_table_entry
{
        unsigned long insn;
        unsigned long fixup;
};

#endif