1#ifndef __M68K_UACCESS_H 2#define __M68K_UACCESS_H 3 4/* 5 * User space memory access functions 6 */ 7#include <linux/compiler.h> 8#include <linux/errno.h> 9#include <linux/types.h> 10#include <linux/sched.h> 11#include <asm/segment.h> 12 13#define VERIFY_READ 0 14#define VERIFY_WRITE 1 15 16/* We let the MMU do all checking */ 17static inline int access_ok(int type, const void __user *addr, 18 unsigned long size) 19{ 20 return 1; 21} 22 23/* 24 * Not all varients of the 68k family support the notion of address spaces. 25 * The traditional 680x0 parts do, and they use the sfc/dfc registers and 26 * the "moves" instruction to access user space from kernel space. Other 27 * family members like ColdFire don't support this, and only have a single 28 * address space, and use the usual "move" instruction for user space access. 29 * 30 * Outside of this difference the user space access functions are the same. 31 * So lets keep the code simple and just define in what we need to use. 32 */ 33#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES 34#define MOVES "moves" 35#else 36#define MOVES "move" 37#endif 38 39/* 40 * The exception table consists of pairs of addresses: the first is the 41 * address of an instruction that is allowed to fault, and the second is 42 * the address at which the program should continue. No registers are 43 * modified, so it is entirely up to the continuation code to figure out 44 * what to do. 45 * 46 * All the routines below use bits of fixup code that are out of line 47 * with the main instruction path. This means when everything is well, 48 * we don't even have to jump over them. Further, they do not intrude 49 * on our cache or tlb entries. 50 */ 51 52struct exception_table_entry 53{ 54 unsigned long insn, fixup; 55}; 56 57extern int __put_user_bad(void); 58extern int __get_user_bad(void); 59 60#define __put_user_asm(res, x, ptr, bwl, reg, err) \ 61asm volatile ("\n" \ 62 "1: "MOVES"."#bwl" %2,%1\n" \ 63 "2:\n" \ 64 " .section .fixup,\"ax\"\n" \ 65 " .even\n" \ 66 "10: moveq.l %3,%0\n" \ 67 " jra 2b\n" \ 68 " .previous\n" \ 69 "\n" \ 70 " .section __ex_table,\"a\"\n" \ 71 " .align 4\n" \ 72 " .long 1b,10b\n" \ 73 " .long 2b,10b\n" \ 74 " .previous" \ 75 : "+d" (res), "=m" (*(ptr)) \ 76 : #reg (x), "i" (err)) 77 78/* 79 * These are the main single-value transfer routines. They automatically 80 * use the right size if we just have the right pointer type. 81 */ 82 83#define __put_user(x, ptr) \ 84({ \ 85 typeof(*(ptr)) __pu_val = (x); \ 86 int __pu_err = 0; \ 87 __chk_user_ptr(ptr); \ 88 switch (sizeof (*(ptr))) { \ 89 case 1: \ 90 __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \ 91 break; \ 92 case 2: \ 93 __put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \ 94 break; \ 95 case 4: \ 96 __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \ 97 break; \ 98 case 8: \ 99 { \ 100 const void __user *__pu_ptr = (ptr); \ 101 asm volatile ("\n" \ 102 "1: "MOVES".l %2,(%1)+\n" \ 103 "2: "MOVES".l %R2,(%1)\n" \ 104 "3:\n" \ 105 " .section .fixup,\"ax\"\n" \ 106 " .even\n" \ 107 "10: movel %3,%0\n" \ 108 " jra 3b\n" \ 109 " .previous\n" \ 110 "\n" \ 111 " .section __ex_table,\"a\"\n" \ 112 " .align 4\n" \ 113 " .long 1b,10b\n" \ 114 " .long 2b,10b\n" \ 115 " .long 3b,10b\n" \ 116 " .previous" \ 117 : "+d" (__pu_err), "+a" (__pu_ptr) \ 118 : "r" (__pu_val), "i" (-EFAULT) \ 119 : "memory"); \ 120 break; \ 121 } \ 122 default: \ 123 __pu_err = __put_user_bad(); \ 124 break; \ 125 } \ 126 __pu_err; \ 127}) 128#define put_user(x, ptr) __put_user(x, ptr) 129 130 131#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \ 132 type __gu_val; \ 133 asm volatile ("\n" \ 134 "1: "MOVES"."#bwl" %2,%1\n" \ 135 "2:\n" \ 136 " .section .fixup,\"ax\"\n" \ 137 " .even\n" \ 138 "10: move.l %3,%0\n" \ 139 " sub.l %1,%1\n" \ 140 " jra 2b\n" \ 141 " .previous\n" \ 142 "\n" \ 143 " .section __ex_table,\"a\"\n" \ 144 " .align 4\n" \ 145 " .long 1b,10b\n" \ 146 " .previous" \ 147 : "+d" (res), "=&" #reg (__gu_val) \ 148 : "m" (*(ptr)), "i" (err)); \ 149 (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \ 150}) 151 152#define __get_user(x, ptr) \ 153({ \ 154 int __gu_err = 0; \ 155 __chk_user_ptr(ptr); \ 156 switch (sizeof(*(ptr))) { \ 157 case 1: \ 158 __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \ 159 break; \ 160 case 2: \ 161 __get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \ 162 break; \ 163 case 4: \ 164 __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \ 165 break; \ 166/* case 8: disabled because gcc-4.1 has a broken typeof \ 167 { \ 168 const void *__gu_ptr = (ptr); \ 169 u64 __gu_val; \ 170 asm volatile ("\n" \ 171 "1: "MOVES".l (%2)+,%1\n" \ 172 "2: "MOVES".l (%2),%R1\n" \ 173 "3:\n" \ 174 " .section .fixup,\"ax\"\n" \ 175 " .even\n" \ 176 "10: move.l %3,%0\n" \ 177 " sub.l %1,%1\n" \ 178 " sub.l %R1,%R1\n" \ 179 " jra 3b\n" \ 180 " .previous\n" \ 181 "\n" \ 182 " .section __ex_table,\"a\"\n" \ 183 " .align 4\n" \ 184 " .long 1b,10b\n" \ 185 " .long 2b,10b\n" \ 186 " .previous" \ 187 : "+d" (__gu_err), "=&r" (__gu_val), \ 188 "+a" (__gu_ptr) \ 189 : "i" (-EFAULT) \ 190 : "memory"); \ 191 (x) = (__force typeof(*(ptr)))__gu_val; \ 192 break; \ 193 } */ \ 194 default: \ 195 __gu_err = __get_user_bad(); \ 196 break; \ 197 } \ 198 __gu_err; \ 199}) 200#define get_user(x, ptr) __get_user(x, ptr) 201 202unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n); 203unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n); 204 205#define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\ 206 asm volatile ("\n" \ 207 "1: "MOVES"."#s1" (%2)+,%3\n" \ 208 " move."#s1" %3,(%1)+\n" \ 209 "2: "MOVES"."#s2" (%2)+,%3\n" \ 210 " move."#s2" %3,(%1)+\n" \ 211 " .ifnc \""#s3"\",\"\"\n" \ 212 "3: "MOVES"."#s3" (%2)+,%3\n" \ 213 " move."#s3" %3,(%1)+\n" \ 214 " .endif\n" \ 215 "4:\n" \ 216 " .section __ex_table,\"a\"\n" \ 217 " .align 4\n" \ 218 " .long 1b,10f\n" \ 219 " .long 2b,20f\n" \ 220 " .ifnc \""#s3"\",\"\"\n" \ 221 " .long 3b,30f\n" \ 222 " .endif\n" \ 223 " .previous\n" \ 224 "\n" \ 225 " .section .fixup,\"ax\"\n" \ 226 " .even\n" \ 227 "10: clr."#s1" (%1)+\n" \ 228 "20: clr."#s2" (%1)+\n" \ 229 " .ifnc \""#s3"\",\"\"\n" \ 230 "30: clr."#s3" (%1)+\n" \ 231 " .endif\n" \ 232 " moveq.l #"#n",%0\n" \ 233 " jra 4b\n" \ 234 " .previous\n" \ 235 : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \ 236 : : "memory") 237 238static __always_inline unsigned long 239__constant_copy_from_user(void *to, const void __user *from, unsigned long n) 240{ 241 unsigned long res = 0, tmp; 242 243 switch (n) { 244 case 1: 245 __get_user_asm(res, *(u8 *)to, (u8 __user *)from, u8, b, d, 1); 246 break; 247 case 2: 248 __get_user_asm(res, *(u16 *)to, (u16 __user *)from, u16, w, r, 2); 249 break; 250 case 3: 251 __constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,); 252 break; 253 case 4: 254 __get_user_asm(res, *(u32 *)to, (u32 __user *)from, u32, l, r, 4); 255 break; 256 case 5: 257 __constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,); 258 break; 259 case 6: 260 __constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,); 261 break; 262 case 7: 263 __constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b); 264 break; 265 case 8: 266 __constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,); 267 break; 268 case 9: 269 __constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b); 270 break; 271 case 10: 272 __constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w); 273 break; 274 case 12: 275 __constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l); 276 break; 277 default: 278 /* we limit the inlined version to 3 moves */ 279 return __generic_copy_from_user(to, from, n); 280 } 281 282 return res; 283} 284 285#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \ 286 asm volatile ("\n" \ 287 " move."#s1" (%2)+,%3\n" \ 288 "11: "MOVES"."#s1" %3,(%1)+\n" \ 289 "12: move."#s2" (%2)+,%3\n" \ 290 "21: "MOVES"."#s2" %3,(%1)+\n" \ 291 "22:\n" \ 292 " .ifnc \""#s3"\",\"\"\n" \ 293 " move."#s3" (%2)+,%3\n" \ 294 "31: "MOVES"."#s3" %3,(%1)+\n" \ 295 "32:\n" \ 296 " .endif\n" \ 297 "4:\n" \ 298 "\n" \ 299 " .section __ex_table,\"a\"\n" \ 300 " .align 4\n" \ 301 " .long 11b,5f\n" \ 302 " .long 12b,5f\n" \ 303 " .long 21b,5f\n" \ 304 " .long 22b,5f\n" \ 305 " .ifnc \""#s3"\",\"\"\n" \ 306 " .long 31b,5f\n" \ 307 " .long 32b,5f\n" \ 308 " .endif\n" \ 309 " .previous\n" \ 310 "\n" \ 311 " .section .fixup,\"ax\"\n" \ 312 " .even\n" \ 313 "5: moveq.l #"#n",%0\n" \ 314 " jra 4b\n" \ 315 " .previous\n" \ 316 : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \ 317 : : "memory") 318 319static __always_inline unsigned long 320__constant_copy_to_user(void __user *to, const void *from, unsigned long n) 321{ 322 unsigned long res = 0, tmp; 323 324 switch (n) { 325 case 1: 326 __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1); 327 break; 328 case 2: 329 __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2); 330 break; 331 case 3: 332 __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,); 333 break; 334 case 4: 335 __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4); 336 break; 337 case 5: 338 __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,); 339 break; 340 case 6: 341 __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,); 342 break; 343 case 7: 344 __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b); 345 break; 346 case 8: 347 __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,); 348 break; 349 case 9: 350 __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b); 351 break; 352 case 10: 353 __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w); 354 break; 355 case 12: 356 __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l); 357 break; 358 default: 359 /* limit the inlined version to 3 moves */ 360 return __generic_copy_to_user(to, from, n); 361 } 362 363 return res; 364} 365 366#define __copy_from_user(to, from, n) \ 367(__builtin_constant_p(n) ? \ 368 __constant_copy_from_user(to, from, n) : \ 369 __generic_copy_from_user(to, from, n)) 370 371#define __copy_to_user(to, from, n) \ 372(__builtin_constant_p(n) ? \ 373 __constant_copy_to_user(to, from, n) : \ 374 __generic_copy_to_user(to, from, n)) 375 376#define __copy_to_user_inatomic __copy_to_user 377#define __copy_from_user_inatomic __copy_from_user 378 379#define copy_from_user(to, from, n) __copy_from_user(to, from, n) 380#define copy_to_user(to, from, n) __copy_to_user(to, from, n) 381 382#define user_addr_max() \ 383 (segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL) 384 385extern long strncpy_from_user(char *dst, const char __user *src, long count); 386extern __must_check long strlen_user(const char __user *str); 387extern __must_check long strnlen_user(const char __user *str, long n); 388 389unsigned long __clear_user(void __user *to, unsigned long n); 390 391#define clear_user __clear_user 392 393#endif /* _M68K_UACCESS_H */ 394