| 1 | /* |
| 2 | * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved. |
| 3 | */ |
| 4 | #ifndef __M68K_CF_UACCESS_H |
| 5 | #define __M68K_CF_UACCESS_H |
| 6 | |
| 7 | /* |
| 8 | * User space memory access functions |
| 9 | */ |
| 10 | |
| 11 | /* The "moves" command is not available in the CF instruction set. */ |
| 12 | #include <linux/compiler.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <asm/segment.h> |
| 17 | |
| 18 | #define VERIFY_READ 0 |
| 19 | #define VERIFY_WRITE 1 |
| 20 | |
| 21 | /* We let the MMU do all checking */ |
| 22 | #define access_ok(type, addr, size) 1 |
| 23 | |
| 24 | /* |
| 25 | * The exception table consists of pairs of addresses: the first is the |
| 26 | * address of an instruction that is allowed to fault, and the second is |
| 27 | * the address at which the program should continue. No registers are |
| 28 | * modified, so it is entirely up to the continuation code to figure out |
| 29 | * what to do. |
| 30 | * |
| 31 | * All the routines below use bits of fixup code that are out of line |
| 32 | * with the main instruction path. This means when everything is well, |
| 33 | * we don't even have to jump over them. Further, they do not intrude |
| 34 | * on our cache or tlb entries. |
| 35 | */ |
| 36 | |
| 37 | struct exception_table_entry |
| 38 | { |
| 39 | unsigned long insn, fixup; |
| 40 | }; |
| 41 | |
| 42 | extern int __put_user_bad(void); |
| 43 | extern int __get_user_bad(void); |
| 44 | |
| 45 | #define __put_user_asm(res, x, ptr, bwl, reg, err) \ |
| 46 | asm volatile ("\n" \ |
| 47 | "1: move."#bwl" %2,%1\n" \ |
| 48 | "2:\n" \ |
| 49 | " .section .fixup,\"ax\"\n" \ |
| 50 | " .even\n" \ |
| 51 | "10: moveq.l %3,%0\n" \ |
| 52 | " jra 2b\n" \ |
| 53 | " .previous\n" \ |
| 54 | "\n" \ |
| 55 | " .section __ex_table,\"a\"\n" \ |
| 56 | " .align 4\n" \ |
| 57 | " .long 1b,10b\n" \ |
| 58 | " .long 2b,10b\n" \ |
| 59 | " .previous" \ |
| 60 | : "+d" (res), "=m" (*(ptr)) \ |
| 61 | : #reg (x), "i" (err)) |
| 62 | |
| 63 | /* |
| 64 | * These are the main single-value transfer routines. They automatically |
| 65 | * use the right size if we just have the right pointer type. |
| 66 | */ |
| 67 | |
| 68 | #define __put_user(x, ptr) \ |
| 69 | ({ \ |
| 70 | typeof(*(ptr)) __pu_val = (x); \ |
| 71 | int __pu_err = 0; \ |
| 72 | __chk_user_ptr(ptr); \ |
| 73 | switch (sizeof (*(ptr))) { \ |
| 74 | case 1: \ |
| 75 | __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \ |
| 76 | break; \ |
| 77 | case 2: \ |
| 78 | __put_user_asm(__pu_err, __pu_val, ptr, w, d, -EFAULT); \ |
| 79 | break; \ |
| 80 | case 4: \ |
| 81 | __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \ |
| 82 | break; \ |
| 83 | case 8: \ |
| 84 | { \ |
| 85 | const void __user *__pu_ptr = (ptr); \ |
| 86 | asm volatile ("\n" \ |
| 87 | "1: move.l %2,(%1)+\n" \ |
| 88 | "2: move.l %R2,(%1)\n" \ |
| 89 | "3:\n" \ |
| 90 | " .section .fixup,\"ax\"\n" \ |
| 91 | " .even\n" \ |
| 92 | "10: movel %3,%0\n" \ |
| 93 | " jra 3b\n" \ |
| 94 | " .previous\n" \ |
| 95 | "\n" \ |
| 96 | " .section __ex_table,\"a\"\n" \ |
| 97 | " .align 4\n" \ |
| 98 | " .long 1b,10b\n" \ |
| 99 | " .long 2b,10b\n" \ |
| 100 | " .long 3b,10b\n" \ |
| 101 | " .previous" \ |
| 102 | : "+d" (__pu_err), "+a" (__pu_ptr) \ |
| 103 | : "r" (__pu_val), "i" (-EFAULT) \ |
| 104 | : "memory"); \ |
| 105 | break; \ |
| 106 | } \ |
| 107 | default: \ |
| 108 | __pu_err = __put_user_bad(); \ |
| 109 | break; \ |
| 110 | } \ |
| 111 | __pu_err; \ |
| 112 | }) |
| 113 | #define put_user(x, ptr) __put_user(x, ptr) |
| 114 | |
| 115 | |
| 116 | #define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \ |
| 117 | type __gu_val; \ |
| 118 | asm volatile ("\n" \ |
| 119 | "1: move."#bwl" %2,%1\n" \ |
| 120 | "2:\n" \ |
| 121 | " .section .fixup,\"ax\"\n" \ |
| 122 | " .even\n" \ |
| 123 | "10: move.l %3,%0\n" \ |
| 124 | " subl %1,%1\n" \ |
| 125 | " jra 2b\n" \ |
| 126 | " .previous\n" \ |
| 127 | "\n" \ |
| 128 | " .section __ex_table,\"a\"\n" \ |
| 129 | " .align 4\n" \ |
| 130 | " .long 1b,10b\n" \ |
| 131 | " .previous" \ |
| 132 | : "+d" (res), "=&" #reg (__gu_val) \ |
| 133 | : "m" (*(ptr)), "i" (err)); \ |
| 134 | (x) = (typeof(*(ptr)))(unsigned long)__gu_val; \ |
| 135 | }) |
| 136 | |
| 137 | #define __get_user(x, ptr) \ |
| 138 | ({ \ |
| 139 | int __gu_err = 0; \ |
| 140 | __chk_user_ptr(ptr); \ |
| 141 | switch (sizeof(*(ptr))) { \ |
| 142 | case 1: \ |
| 143 | __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \ |
| 144 | break; \ |
| 145 | case 2: \ |
| 146 | __get_user_asm(__gu_err, x, ptr, u16, w, d, -EFAULT); \ |
| 147 | break; \ |
| 148 | case 4: \ |
| 149 | __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \ |
| 150 | break; \ |
| 151 | /* case 8: disabled because gcc-4.1 has a broken typeof \ |
| 152 | { \ |
| 153 | const void *__gu_ptr = (ptr); \ |
| 154 | u64 __gu_val; \ |
| 155 | asm volatile ("\n" \ |
| 156 | "1: move.l (%2)+,%1\n" \ |
| 157 | "2: move.l (%2),%R1\n" \ |
| 158 | "3:\n" \ |
| 159 | " .section .fixup,\"ax\"\n" \ |
| 160 | " .even\n" \ |
| 161 | "10: move.l %3,%0\n" \ |
| 162 | " subl %1,%1\n" \ |
| 163 | " subl %R1,%R1\n" \ |
| 164 | " jra 3b\n" \ |
| 165 | " .previous\n" \ |
| 166 | "\n" \ |
| 167 | " .section __ex_table,\"a\"\n" \ |
| 168 | " .align 4\n" \ |
| 169 | " .long 1b,10b\n" \ |
| 170 | " .long 2b,10b\n" \ |
| 171 | " .previous" \ |
| 172 | : "+d" (__gu_err), "=&r" (__gu_val), \ |
| 173 | "+a" (__gu_ptr) \ |
| 174 | : "i" (-EFAULT) \ |
| 175 | : "memory"); \ |
| 176 | (x) = (typeof(*(ptr)))__gu_val; \ |
| 177 | break; \ |
| 178 | } */ \ |
| 179 | default: \ |
| 180 | __gu_err = __get_user_bad(); \ |
| 181 | break; \ |
| 182 | } \ |
| 183 | __gu_err; \ |
| 184 | }) |
| 185 | #define get_user(x, ptr) __get_user(x, ptr) |
| 186 | |
| 187 | unsigned long __generic_copy_from_user(void *to, const void __user *from, |
| 188 | unsigned long n); |
| 189 | unsigned long __generic_copy_to_user(void __user *to, const void *from, |
| 190 | unsigned long n); |
| 191 | |
| 192 | #define __constant_copy_from_user_asm(res, to, from, tmp, n, s1, s2, s3)\ |
| 193 | asm volatile ("\n" \ |
| 194 | "1: move."#s1" (%2)+,%3\n" \ |
| 195 | " move."#s1" %3,(%1)+\n" \ |
| 196 | "2: move."#s2" (%2)+,%3\n" \ |
| 197 | " move."#s2" %3,(%1)+\n" \ |
| 198 | " .ifnc \""#s3"\",\"\"\n" \ |
| 199 | "3: move."#s3" (%2)+,%3\n" \ |
| 200 | " move."#s3" %3,(%1)+\n" \ |
| 201 | " .endif\n" \ |
| 202 | "4:\n" \ |
| 203 | " .section __ex_table,\"a\"\n" \ |
| 204 | " .align 4\n" \ |
| 205 | " .long 1b,10f\n" \ |
| 206 | " .long 2b,20f\n" \ |
| 207 | " .ifnc \""#s3"\",\"\"\n" \ |
| 208 | " .long 3b,30f\n" \ |
| 209 | " .endif\n" \ |
| 210 | " .previous\n" \ |
| 211 | "\n" \ |
| 212 | " .section .fixup,\"ax\"\n" \ |
| 213 | " .even\n" \ |
| 214 | "10: clr."#s1" (%1)+\n" \ |
| 215 | "20: clr."#s2" (%1)+\n" \ |
| 216 | " .ifnc \""#s3"\",\"\"\n" \ |
| 217 | "30: clr."#s3" (%1)+\n" \ |
| 218 | " .endif\n" \ |
| 219 | " moveq.l #"#n",%0\n" \ |
| 220 | " jra 4b\n" \ |
| 221 | " .previous\n" \ |
| 222 | : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \ |
| 223 | : : "memory") |
| 224 | |
| 225 | static __always_inline unsigned long |
| 226 | __constant_copy_from_user(void *to, const void __user *from, unsigned long n) |
| 227 | { |
| 228 | unsigned long res = 0, tmp; |
| 229 | |
| 230 | switch (n) { |
| 231 | case 1: |
| 232 | __get_user_asm(res, *(u8 *)to, (u8 __user *)from, u8, b, d, 1); |
| 233 | break; |
| 234 | case 2: |
| 235 | __get_user_asm(res, *(u16 *)to, (u16 __user *)from, u16, w, |
| 236 | d, 2); |
| 237 | break; |
| 238 | case 3: |
| 239 | __constant_copy_from_user_asm(res, to, from, tmp, 3, w, b,); |
| 240 | break; |
| 241 | case 4: |
| 242 | __get_user_asm(res, *(u32 *)to, (u32 __user *)from, u32, l, |
| 243 | r, 4); |
| 244 | break; |
| 245 | case 5: |
| 246 | __constant_copy_from_user_asm(res, to, from, tmp, 5, l, b,); |
| 247 | break; |
| 248 | case 6: |
| 249 | __constant_copy_from_user_asm(res, to, from, tmp, 6, l, w,); |
| 250 | break; |
| 251 | case 7: |
| 252 | __constant_copy_from_user_asm(res, to, from, tmp, 7, l, w, b); |
| 253 | break; |
| 254 | case 8: |
| 255 | __constant_copy_from_user_asm(res, to, from, tmp, 8, l, l,); |
| 256 | break; |
| 257 | case 9: |
| 258 | __constant_copy_from_user_asm(res, to, from, tmp, 9, l, l, b); |
| 259 | break; |
| 260 | case 10: |
| 261 | __constant_copy_from_user_asm(res, to, from, tmp, 10, l, l, w); |
| 262 | break; |
| 263 | case 12: |
| 264 | __constant_copy_from_user_asm(res, to, from, tmp, 12, l, l, l); |
| 265 | break; |
| 266 | default: |
| 267 | /* we limit the inlined version to 3 moves */ |
| 268 | return __generic_copy_from_user(to, from, n); |
| 269 | } |
| 270 | |
| 271 | return res; |
| 272 | } |
| 273 | |
| 274 | #define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \ |
| 275 | asm volatile ("\n" \ |
| 276 | " move."#s1" (%2)+,%3\n" \ |
| 277 | "11: move."#s1" %3,(%1)+\n" \ |
| 278 | "12: move."#s2" (%2)+,%3\n" \ |
| 279 | "21: move."#s2" %3,(%1)+\n" \ |
| 280 | "22:\n" \ |
| 281 | " .ifnc \""#s3"\",\"\"\n" \ |
| 282 | " move."#s3" (%2)+,%3\n" \ |
| 283 | "31: move."#s3" %3,(%1)+\n" \ |
| 284 | "32:\n" \ |
| 285 | " .endif\n" \ |
| 286 | "4:\n" \ |
| 287 | "\n" \ |
| 288 | " .section __ex_table,\"a\"\n" \ |
| 289 | " .align 4\n" \ |
| 290 | " .long 11b,5f\n" \ |
| 291 | " .long 12b,5f\n" \ |
| 292 | " .long 21b,5f\n" \ |
| 293 | " .long 22b,5f\n" \ |
| 294 | " .ifnc \""#s3"\",\"\"\n" \ |
| 295 | " .long 31b,5f\n" \ |
| 296 | " .long 32b,5f\n" \ |
| 297 | " .endif\n" \ |
| 298 | " .previous\n" \ |
| 299 | "\n" \ |
| 300 | " .section .fixup,\"ax\"\n" \ |
| 301 | " .even\n" \ |
| 302 | "5: moveq.l #"#n",%0\n" \ |
| 303 | " jra 4b\n" \ |
| 304 | " .previous\n" \ |
| 305 | : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \ |
| 306 | : : "memory") |
| 307 | |
| 308 | static __always_inline unsigned long |
| 309 | __constant_copy_to_user(void __user *to, const void *from, unsigned long n) |
| 310 | { |
| 311 | unsigned long res = 0, tmp; |
| 312 | |
| 313 | switch (n) { |
| 314 | case 1: |
| 315 | __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1); |
| 316 | break; |
| 317 | case 2: |
| 318 | __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, d, 2); |
| 319 | break; |
| 320 | case 3: |
| 321 | __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,); |
| 322 | break; |
| 323 | case 4: |
| 324 | __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4); |
| 325 | break; |
| 326 | case 5: |
| 327 | __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,); |
| 328 | break; |
| 329 | case 6: |
| 330 | __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,); |
| 331 | break; |
| 332 | case 7: |
| 333 | __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b); |
| 334 | break; |
| 335 | case 8: |
| 336 | __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,); |
| 337 | break; |
| 338 | case 9: |
| 339 | __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b); |
| 340 | break; |
| 341 | case 10: |
| 342 | __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w); |
| 343 | break; |
| 344 | case 12: |
| 345 | __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l); |
| 346 | break; |
| 347 | default: |
| 348 | /* limit the inlined version to 3 moves */ |
| 349 | return __generic_copy_to_user(to, from, n); |
| 350 | } |
| 351 | |
| 352 | return res; |
| 353 | } |
| 354 | |
| 355 | #define __copy_from_user(to, from, n) \ |
| 356 | (__builtin_constant_p(n) ? \ |
| 357 | __constant_copy_from_user(to, from, n) : \ |
| 358 | __generic_copy_from_user(to, from, n)) |
| 359 | |
| 360 | #define __copy_to_user(to, from, n) \ |
| 361 | (__builtin_constant_p(n) ? \ |
| 362 | __constant_copy_to_user(to, from, n) : \ |
| 363 | __generic_copy_to_user(to, from, n)) |
| 364 | |
| 365 | #define __copy_to_user_inatomic __copy_to_user |
| 366 | #define __copy_from_user_inatomic __copy_from_user |
| 367 | |
| 368 | #define copy_from_user(to, from, n) __copy_from_user(to, from, n) |
| 369 | #define copy_to_user(to, from, n) __copy_to_user(to, from, n) |
| 370 | |
| 371 | long strncpy_from_user(char *dst, const char __user *src, long count); |
| 372 | long strnlen_user(const char __user *src, long n); |
| 373 | unsigned long __clear_user(void __user *to, unsigned long n); |
| 374 | |
| 375 | #define clear_user __clear_user |
| 376 | |
| 377 | #define strlen_user(str) strnlen_user(str, 32767) |
| 378 | |
| 379 | #endif /* _M68K_CF_UACCESS_H */ |
| 380 | |
