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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | #ifndef _ASMARM_UACCESS_H #define _ASMARM_UACCESS_H /* * User space memory access functions */ #include <linux/sched.h> #define VERIFY_READ 0 #define VERIFY_WRITE 1 /* * The exception table consists of pairs of addresses: the first is the * address of an instruction that is allowed to fault, and the second is * the address at which the program should continue. No registers are * modified, so it is entirely up to the continuation code to figure out * what to do. * * All the routines below use bits of fixup code that are out of line * with the main instruction path. This means when everything is well, * we don't even have to jump over them. Further, they do not intrude * on our cache or tlb entries. */ struct exception_table_entry { unsigned long insn, fixup; }; /* Returns 0 if exception not found and fixup otherwise. */ extern unsigned long search_exception_table(unsigned long); #include <asm/proc/uaccess.h> extern inline int verify_area(int type, const void * addr, unsigned long size) { return access_ok(type,addr,size) ? 0 : -EFAULT; } /* * Single-value transfer routines. They automatically use the right * size if we just have the right pointer type. * * The "__xxx" versions of the user access functions do not verify the * address space - it must have been done previously with a separate * "access_ok()" call. * * The "xxx_ret" versions return constant specified in the third * argument if something bad happens. */ #define get_user(x,p) __get_user_check((x),(p),sizeof(*(p))) #define __get_user(x,p) __get_user_nocheck((x),(p),sizeof(*(p))) #define get_user_ret(x,p,r) ({ if (get_user(x,p)) return r; }) #define __get_user_ret(x,p,r) ({ if (__get_user(x,p)) return r; }) #define put_user(x,p) __put_user_check((__typeof(*(p)))(x),(p),sizeof(*(p))) #define __put_user(x,p) __put_user_nocheck((__typeof(*(p)))(x),(p),sizeof(*(p))) #define put_user_ret(x,p,r) ({ if (put_user(x,p)) return r; }) #define __put_user_ret(x,p,r) ({ if (__put_user(x,p)) return r; }) static __inline__ unsigned long copy_from_user(void *to, const void *from, unsigned long n) { char *end = (char *)to + n; if (access_ok(VERIFY_READ, from, n)) { __do_copy_from_user(to, from, n); if (n) memset(end - n, 0, n); } return n; } static __inline__ unsigned long __copy_from_user(void *to, const void *from, unsigned long n) { __do_copy_from_user(to, from, n); return n; } #define copy_from_user_ret(t,f,n,r) \ ({ if (copy_from_user(t,f,n)) return r; }) static __inline__ unsigned long copy_to_user(void *to, const void *from, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) __do_copy_to_user(to, from, n); return n; } static __inline__ unsigned long __copy_to_user(void *to, const void *from, unsigned long n) { __do_copy_to_user(to, from, n); return n; } #define copy_to_user_ret(t,f,n,r) \ ({ if (copy_to_user(t,f,n)) return r; }) static __inline__ unsigned long clear_user (void *to, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) __do_clear_user(to, n); return n; } static __inline__ unsigned long __clear_user (void *to, unsigned long n) { __do_clear_user(to, n); return n; } static __inline__ long strncpy_from_user (char *dst, const char *src, long count) { long res = -EFAULT; if (access_ok(VERIFY_READ, src, 1)) __do_strncpy_from_user(dst, src, count, res); return res; } static __inline__ long __strncpy_from_user (char *dst, const char *src, long count) { long res; __do_strncpy_from_user(dst, src, count, res); return res; } extern __inline__ long strnlen_user (const char *s, long n) { unsigned long res = 0; if (__addr_ok(s)) __do_strnlen_user (s, n, res); return res; } /* * These are the work horses of the get/put_user functions */ #define __get_user_check(x,ptr,size) \ ({ \ long __gu_err = -EFAULT, __gu_val = 0; \ const __typeof__(*(ptr)) *__gu_addr = (ptr); \ if (access_ok(VERIFY_READ,__gu_addr,size)) \ __get_user_size(__gu_val,__gu_addr,(size),__gu_err); \ (x) = (__typeof__(*(ptr)))__gu_val; \ __gu_err; \ }) #define __get_user_nocheck(x,ptr,size) \ ({ \ long __gu_err = 0, __gu_val = 0; \ __get_user_size(__gu_val,(ptr),(size),__gu_err); \ (x) = (__typeof__(*(ptr)))__gu_val; \ __gu_err; \ }) #define __put_user_check(x,ptr,size) \ ({ \ long __pu_err = -EFAULT; \ __typeof__(*(ptr)) *__pu_addr = (ptr); \ if (access_ok(VERIFY_WRITE,__pu_addr,size)) \ __put_user_size((x),__pu_addr,(size),__pu_err); \ __pu_err; \ }) #define __put_user_nocheck(x,ptr,size) \ ({ \ long __pu_err = 0; \ __put_user_size((x),(ptr),(size),__pu_err); \ __pu_err; \ }) extern long __get_user_bad(void); #define __get_user_size(x,ptr,size,retval) \ do { \ retval = 0; \ switch (size) { \ case 1: __get_user_asm_byte(x,ptr,retval); break; \ case 2: __get_user_asm_half(x,ptr,retval); break; \ case 4: __get_user_asm_word(x,ptr,retval); break; \ default: (x) = __get_user_bad(); \ } \ } while (0) extern long __put_user_bad(void); #define __put_user_size(x,ptr,size,retval) \ do { \ retval = 0; \ switch (size) { \ case 1: __put_user_asm_byte(x,ptr,retval); break; \ case 2: __put_user_asm_half(x,ptr,retval); break; \ case 4: __put_user_asm_word(x,ptr,retval); break; \ default: __put_user_bad(); \ } \ } while (0) #endif /* _ASMARM_UACCESS_H */ |