Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : /* 
       3             :  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
       4             :  * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
       5             :  */
       6             : 
       7             : #ifndef __UM_UACCESS_H
       8             : #define __UM_UACCESS_H
       9             : 
      10             : #include <asm/elf.h>
      11             : #include <asm/unaligned.h>
      12             : 
      13             : #define __under_task_size(addr, size) \
      14             :         (((unsigned long) (addr) < TASK_SIZE) && \
      15             :          (((unsigned long) (addr) + (size)) < TASK_SIZE))
      16             : 
      17             : #define __access_ok_vsyscall(addr, size) \
      18             :           (((unsigned long) (addr) >= FIXADDR_USER_START) && \
      19             :           ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
      20             :           ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
      21             : 
      22             : #define __addr_range_nowrap(addr, size) \
      23             :         ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
      24             : 
      25             : extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n);
      26             : extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n);
      27             : extern unsigned long __clear_user(void __user *mem, unsigned long len);
      28             : static inline int __access_ok(const void __user *ptr, unsigned long size);
      29             : 
      30             : /* Teach asm-generic/uaccess.h that we have C functions for these. */
      31             : #define __access_ok __access_ok
      32             : #define __clear_user __clear_user
      33             : 
      34             : #define INLINE_COPY_FROM_USER
      35             : #define INLINE_COPY_TO_USER
      36             : 
      37             : #include <asm-generic/uaccess.h>
      38             : 
      39             : static inline int __access_ok(const void __user *ptr, unsigned long size)
      40             : {
      41           0 :         unsigned long addr = (unsigned long)ptr;
      42           0 :         return __addr_range_nowrap(addr, size) &&
      43           0 :                 (__under_task_size(addr, size) ||
      44             :                  __access_ok_vsyscall(addr, size));
      45             : }
      46             : 
      47             : /* no pagefaults for kernel addresses in um */
      48             : #define __get_kernel_nofault(dst, src, type, err_label)                 \
      49             : do {                                                                    \
      50             :         *((type *)dst) = get_unaligned((type *)(src));                  \
      51             :         if (0) /* make sure the label looks used to the compiler */     \
      52             :                 goto err_label;                                         \
      53             : } while (0)
      54             : 
      55             : #define __put_kernel_nofault(dst, src, type, err_label)                 \
      56             : do {                                                                    \
      57             :         put_unaligned(*((type *)src), (type *)(dst));                   \
      58             :         if (0) /* make sure the label looks used to the compiler */     \
      59             :                 goto err_label;                                         \
      60             : } while (0)
      61             : 
      62             : #endif