include/asm-arm/proc-armo/uaccess.h

   1 /*
   2  *  linux/include/asm-arm/proc-armo/segment.h
   3  *
   4  *  Copyright (C) 1996 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 /*
  12  * The fs functions are implemented on the ARM2 and ARM3 architectures
  13  * manually.
  14  * Use *_user functions to access user memory with faulting behaving
  15  *   as though the user is accessing the memory.
  16  * Use set_fs(get_ds()) and then the *_user functions to allow them to
  17  *   access kernel memory.
  18  */
  19
  20 /*
  21  * These are the values used to represent the user `fs' and the kernel `ds'
  22  */
  23 #define KERNEL_DS       0x03000000
  24 #define USER_DS         0x02000000
  25
  26 extern uaccess_t uaccess_user, uaccess_kernel;
  27
  28 static inline void set_fs (mm_segment_t fs)
  29 {
  30         current->addr_limit = fs;
  31         current->thread.uaccess = fs == USER_DS ? &uaccess_user : &uaccess_kernel;
  32 }
  33
  34 #define __range_ok(addr,size) ({                                        \
  35         unsigned long flag, sum;                                        \
  36         __asm__ __volatile__("subs %1, %0, %3; cmpcs %1, %2; movcs %0, #0" \
  37                 : "=&r" (flag), "=&r" (sum)                             \
  38                 : "r" (addr), "Ir" (size), "0" (current->addr_limit)    \
  39                 : "cc");                                                \
  40         flag; })
  41
  42 #define __addr_ok(addr) ({                                              \
  43         unsigned long flag;                                             \
  44         __asm__ __volatile__("cmp %2, %0; movlo %0, #0"                 \
  45                 : "=&r" (flag)                                          \
  46                 : "0" (current->addr_limit), "r" (addr)                 \
  47                 : "cc");                                                \
  48         (flag == 0); })
  49
  50 #define __put_user_asm_byte(x,addr,err)                                 \
  51         __asm__ __volatile__(                                           \
  52         "       mov     r0, %1\n"                                       \
  53         "       mov     r1, %2\n"                                       \
  54         "       mov     r2, %0\n"                                       \
  55         "       mov     lr, pc\n"                                       \
  56         "       mov     pc, %3\n"                                       \
  57         "       mov     %0, r2\n"                                       \
  58         : "=r" (err)                                                    \
  59         : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_byte), \
  60           "0" (err)                                                     \
  61         : "r0", "r1", "r2", "lr")
  62
  63 #define __put_user_asm_half(x,addr,err)                                 \
  64         __asm__ __volatile__(                                           \
  65         "       mov     r0, %1\n"                                       \
  66         "       mov     r1, %2\n"                                       \
  67         "       mov     r2, %0\n"                                       \
  68         "       mov     lr, pc\n"                                       \
  69         "       mov     pc, %3\n"                                       \
  70         "       mov     %0, r2\n"                                       \
  71         : "=r" (err)                                                    \
  72         : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_half), \
  73           "0" (err)                                                     \
  74         : "r0", "r1", "r2", "lr")
  75
  76 #define __put_user_asm_word(x,addr,err)                                 \
  77         __asm__ __volatile__(                                           \
  78         "       mov     r0, %1\n"                                       \
  79         "       mov     r1, %2\n"                                       \
  80         "       mov     r2, %0\n"                                       \
  81         "       mov     lr, pc\n"                                       \
  82         "       mov     pc, %3\n"                                       \
  83         "       mov     %0, r2\n"                                       \
  84         : "=r" (err)                                                    \
  85         : "r" (x), "r" (addr), "r" (current->thread.uaccess->put_word), \
  86           "0" (err)                                                     \
  87         : "r0", "r1", "r2", "lr")
  88
  89 #define __get_user_asm_byte(x,addr,err)                                 \
  90         __asm__ __volatile__(                                           \
  91         "       mov     r0, %2\n"                                       \
  92         "       mov     r1, %0\n"                                       \
  93         "       mov     lr, pc\n"                                       \
  94         "       mov     pc, %3\n"                                       \
  95         "       mov     %0, r1\n"                                       \
  96         "       mov     %1, r0\n"                                       \
  97         : "=r" (err), "=r" (x)                                          \
  98         : "r" (addr), "r" (current->thread.uaccess->get_byte), "0" (err)        \
  99         : "r0", "r1", "r2", "lr")
 100
 101 #define __get_user_asm_half(x,addr,err)                                 \
 102         __asm__ __volatile__(                                           \
 103         "       mov     r0, %2\n"                                       \
 104         "       mov     r1, %0\n"                                       \
 105         "       mov     lr, pc\n"                                       \
 106         "       mov     pc, %3\n"                                       \
 107         "       mov     %0, r1\n"                                       \
 108         "       mov     %1, r0\n"                                       \
 109         : "=r" (err), "=r" (x)                                          \
 110         : "r" (addr), "r" (current->thread.uaccess->get_half), "0" (err)        \
 111         : "r0", "r1", "r2", "lr")
 112
 113 #define __get_user_asm_word(x,addr,err)                                 \
 114         __asm__ __volatile__(                                           \
 115         "       mov     r0, %2\n"                                       \
 116         "       mov     r1, %0\n"                                       \
 117         "       mov     lr, pc\n"                                       \
 118         "       mov     pc, %3\n"                                       \
 119         "       mov     %0, r1\n"                                       \
 120         "       mov     %1, r0\n"                                       \
 121         : "=r" (err), "=r" (x)                                          \
 122         : "r" (addr), "r" (current->thread.uaccess->get_word), "0" (err)        \
 123         : "r0", "r1", "r2", "lr")
 124
 125 #define __do_copy_from_user(to,from,n)                                  \
 126         (n) = current->thread.uaccess->copy_from_user((to),(from),(n))
 127
 128 #define __do_copy_to_user(to,from,n)                                    \
 129         (n) = current->thread.uaccess->copy_to_user((to),(from),(n))
 130
 131 #define __do_clear_user(addr,sz)                                        \
 132         (sz) = current->thread.uaccess->clear_user((addr),(sz))
 133
 134 #define __do_strncpy_from_user(dst,src,count,res)                       \
 135         (res) = current->thread.uaccess->strncpy_from_user(dst,src,count)
 136
 137 #define __do_strnlen_user(s,n,res)                                      \
 138         (res) = current->thread.uaccess->strnlen_user(s,n)