100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
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/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __UM_UACCESS_H
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#define __UM_UACCESS_H
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#include <asm/errno.h>
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#include <asm/processor.h>
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/* thread_info has a mm_segment_t in it, so put the definition up here */
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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#include "linux/thread_info.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, these macros are grossly 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(TASK_SIZE)
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current_thread_info()->addr_limit)
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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#define segment_eq(a, b) ((a).seg == (b).seg)
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#include "um_uaccess.h"
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#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
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#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
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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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#define __get_user(x, ptr) \
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({ \
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const __typeof__(*(ptr)) __user *__private_ptr = (ptr); \
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__typeof__(x) __private_val; \
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int __private_ret = -EFAULT; \
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(x) = (__typeof__(*(__private_ptr)))0; \
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if (__copy_from_user((__force void *)&__private_val, (__private_ptr),\
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sizeof(*(__private_ptr))) == 0) { \
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(x) = (__typeof__(*(__private_ptr))) __private_val; \
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__private_ret = 0; \
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} \
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__private_ret; \
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})
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#define get_user(x, ptr) \
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({ \
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const __typeof__((*(ptr))) __user *private_ptr = (ptr); \
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(access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \
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__get_user(x, private_ptr) : ((x) = (__typeof__(*ptr))0, -EFAULT)); \
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})
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#define __put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) __user *__private_ptr = ptr; \
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__typeof__(*(__private_ptr)) __private_val; \
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int __private_ret = -EFAULT; \
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__private_val = (__typeof__(*(__private_ptr))) (x); \
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if (__copy_to_user((__private_ptr), &__private_val, \
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sizeof(*(__private_ptr))) == 0) { \
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__private_ret = 0; \
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} \
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__private_ret; \
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})
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#define put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) __user *private_ptr = (ptr); \
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(access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \
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__put_user(x, private_ptr) : -EFAULT); \
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})
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#define strlen_user(str) strnlen_user(str, ~0U >> 1)
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struct exception_table_entry
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{
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unsigned long insn;
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unsigned long fixup;
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};
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#endif
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