projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * User address space access functions. | |
| 3 | * The non inlined parts of asm-i386/uaccess.h are here. | |
| 4 | * | |
| 5 | * Copyright 1997 Andi Kleen <ak@muc.de> | |
| 6 | * Copyright 1997 Linus Torvalds | |
| 7 | */ | |
| 1da177e4 LT |
8 | #include <linux/mm.h> |
| 9 | #include <linux/highmem.h> | |
| 10 | #include <linux/blkdev.h> | |
| 11 | #include <linux/module.h> | |
| 12 | #include <asm/uaccess.h> | |
| 13 | #include <asm/mmx.h> | |
| 14 | ||
| 15 | static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n) | |
| 16 | { | |
| 17 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
| 18 | if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask)) | |
| 19 | return 0; | |
| 20 | #endif | |
| 21 | return 1; | |
| 22 | } | |
| 23 | #define movsl_is_ok(a1,a2,n) \ | |
| 24 | __movsl_is_ok((unsigned long)(a1),(unsigned long)(a2),(n)) | |
| 25 | ||
| 26 | /* | |
| 27 | * Copy a null terminated string from userspace. | |
| 28 | */ | |
| 29 | ||
| 30 | #define __do_strncpy_from_user(dst,src,count,res) \ | |
| 31 | do { \ | |
| 32 | int __d0, __d1, __d2; \ | |
| 33 | might_sleep(); \ | |
| 34 | __asm__ __volatile__( \ | |
| 35 | " testl %1,%1\n" \ | |
| 36 | " jz 2f\n" \ | |
| 37 | "0: lodsb\n" \ | |
| 38 | " stosb\n" \ | |
| 39 | " testb %%al,%%al\n" \ | |
| 40 | " jz 1f\n" \ | |
| 41 | " decl %1\n" \ | |
| 42 | " jnz 0b\n" \ | |
| 43 | "1: subl %1,%0\n" \ | |
| 44 | "2:\n" \ | |
| 45 | ".section .fixup,\"ax\"\n" \ | |
| 46 | "3: movl %5,%0\n" \ | |
| 47 | " jmp 2b\n" \ | |
| 48 | ".previous\n" \ | |
| 49 | ".section __ex_table,\"a\"\n" \ | |
| 50 | " .align 4\n" \ | |
| 51 | " .long 0b,3b\n" \ | |
| 52 | ".previous" \ | |
| 53 | : "=d"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \ | |
| 54 | "=&D" (__d2) \ | |
| 55 | : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \ | |
| 56 | : "memory"); \ | |
| 57 | } while (0) | |
| 58 | ||
| 59 | /** | |
| 60 | * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking. | |
| 61 | * @dst: Destination address, in kernel space. This buffer must be at | |
| 62 | * least @count bytes long. | |
| 63 | * @src: Source address, in user space. | |
| 64 | * @count: Maximum number of bytes to copy, including the trailing NUL. | |
| 65 | * | |
| 66 | * Copies a NUL-terminated string from userspace to kernel space. | |
| 67 | * Caller must check the specified block with access_ok() before calling | |
| 68 | * this function. | |
| 69 | * | |
| 70 | * On success, returns the length of the string (not including the trailing | |
| 71 | * NUL). | |
| 72 | * | |
| 73 | * If access to userspace fails, returns -EFAULT (some data may have been | |
| 74 | * copied). | |
| 75 | * | |
| 76 | * If @count is smaller than the length of the string, copies @count bytes | |
| 77 | * and returns @count. | |
| 78 | */ | |
| 79 | long | |
| 80 | __strncpy_from_user(char *dst, const char __user *src, long count) | |
| 81 | { | |
| 82 | long res; | |
| 83 | __do_strncpy_from_user(dst, src, count, res); | |
| 84 | return res; | |
| 85 | } | |
| 129f6946 | 86 | EXPORT_SYMBOL(__strncpy_from_user); |
| 1da177e4 LT |
87 | |
| 88 | /** | |
| 89 | * strncpy_from_user: - Copy a NUL terminated string from userspace. | |
| 90 | * @dst: Destination address, in kernel space. This buffer must be at | |
| 91 | * least @count bytes long. | |
| 92 | * @src: Source address, in user space. | |
| 93 | * @count: Maximum number of bytes to copy, including the trailing NUL. | |
| 94 | * | |
| 95 | * Copies a NUL-terminated string from userspace to kernel space. | |
| 96 | * | |
| 97 | * On success, returns the length of the string (not including the trailing | |
| 98 | * NUL). | |
| 99 | * | |
| 100 | * If access to userspace fails, returns -EFAULT (some data may have been | |
| 101 | * copied). | |
| 102 | * | |
| 103 | * If @count is smaller than the length of the string, copies @count bytes | |
| 104 | * and returns @count. | |
| 105 | */ | |
| 106 | long | |
| 107 | strncpy_from_user(char *dst, const char __user *src, long count) | |
| 108 | { | |
| 109 | long res = -EFAULT; | |
| 110 | if (access_ok(VERIFY_READ, src, 1)) | |
| 111 | __do_strncpy_from_user(dst, src, count, res); | |
| 112 | return res; | |
| 113 | } | |
| 129f6946 | 114 | EXPORT_SYMBOL(strncpy_from_user); |
| 1da177e4 LT |
115 | |
| 116 | /* | |
| 117 | * Zero Userspace | |
| 118 | */ | |
| 119 | ||
| 120 | #define __do_clear_user(addr,size) \ | |
| 121 | do { \ | |
| 122 | int __d0; \ | |
| 123 | might_sleep(); \ | |
| 124 | __asm__ __volatile__( \ | |
| 125 | "0: rep; stosl\n" \ | |
| 126 | " movl %2,%0\n" \ | |
| 127 | "1: rep; stosb\n" \ | |
| 128 | "2:\n" \ | |
| 129 | ".section .fixup,\"ax\"\n" \ | |
| 130 | "3: lea 0(%2,%0,4),%0\n" \ | |
| 131 | " jmp 2b\n" \ | |
| 132 | ".previous\n" \ | |
| 133 | ".section __ex_table,\"a\"\n" \ | |
| 134 | " .align 4\n" \ | |
| 135 | " .long 0b,3b\n" \ | |
| 136 | " .long 1b,2b\n" \ | |
| 137 | ".previous" \ | |
| 138 | : "=&c"(size), "=&D" (__d0) \ | |
| 139 | : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \ | |
| 140 | } while (0) | |
| 141 | ||
| 142 | /** | |
| 143 | * clear_user: - Zero a block of memory in user space. | |
| 144 | * @to: Destination address, in user space. | |
| 145 | * @n: Number of bytes to zero. | |
| 146 | * | |
| 147 | * Zero a block of memory in user space. | |
| 148 | * | |
| 149 | * Returns number of bytes that could not be cleared. | |
| 150 | * On success, this will be zero. | |
| 151 | */ | |
| 152 | unsigned long | |
| 153 | clear_user(void __user *to, unsigned long n) | |
| 154 | { | |
| 155 | might_sleep(); | |
| 156 | if (access_ok(VERIFY_WRITE, to, n)) | |
| 157 | __do_clear_user(to, n); | |
| 158 | return n; | |
| 159 | } | |
| 129f6946 | 160 | EXPORT_SYMBOL(clear_user); |
| 1da177e4 LT |
161 | |
| 162 | /** | |
| 163 | * __clear_user: - Zero a block of memory in user space, with less checking. | |
| 164 | * @to: Destination address, in user space. | |
| 165 | * @n: Number of bytes to zero. | |
| 166 | * | |
| 167 | * Zero a block of memory in user space. Caller must check | |
| 168 | * the specified block with access_ok() before calling this function. | |
| 169 | * | |
| 170 | * Returns number of bytes that could not be cleared. | |
| 171 | * On success, this will be zero. | |
| 172 | */ | |
| 173 | unsigned long | |
| 174 | __clear_user(void __user *to, unsigned long n) | |
| 175 | { | |
| 176 | __do_clear_user(to, n); | |
| 177 | return n; | |
| 178 | } | |
| 129f6946 | 179 | EXPORT_SYMBOL(__clear_user); |
| 1da177e4 LT |
180 | |
| 181 | /** | |
| 182 | * strlen_user: - Get the size of a string in user space. | |
| 183 | * @s: The string to measure. | |
| 184 | * @n: The maximum valid length | |
| 185 | * | |
| 186 | * Get the size of a NUL-terminated string in user space. | |
| 187 | * | |
| 188 | * Returns the size of the string INCLUDING the terminating NUL. | |
| 189 | * On exception, returns 0. | |
| 190 | * If the string is too long, returns a value greater than @n. | |
| 191 | */ | |
| 192 | long strnlen_user(const char __user *s, long n) | |
| 193 | { | |
| 194 | unsigned long mask = -__addr_ok(s); | |
| 195 | unsigned long res, tmp; | |
| 196 | ||
| 197 | might_sleep(); | |
| 198 | ||
| 199 | __asm__ __volatile__( | |
| 200 | " testl %0, %0\n" | |
| 201 | " jz 3f\n" | |
| 202 | " andl %0,%%ecx\n" | |
| 203 | "0: repne; scasb\n" | |
| 204 | " setne %%al\n" | |
| 205 | " subl %%ecx,%0\n" | |
| 206 | " addl %0,%%eax\n" | |
| 207 | "1:\n" | |
| 208 | ".section .fixup,\"ax\"\n" | |
| 209 | "2: xorl %%eax,%%eax\n" | |
| 210 | " jmp 1b\n" | |
| 211 | "3: movb $1,%%al\n" | |
| 212 | " jmp 1b\n" | |
| 213 | ".previous\n" | |
| 214 | ".section __ex_table,\"a\"\n" | |
| 215 | " .align 4\n" | |
| 216 | " .long 0b,2b\n" | |
| 217 | ".previous" | |
| 218 | :"=r" (n), "=D" (s), "=a" (res), "=c" (tmp) | |
| 219 | :"0" (n), "1" (s), "2" (0), "3" (mask) | |
| 220 | :"cc"); | |
| 221 | return res & mask; | |
| 222 | } | |
| 129f6946 | 223 | EXPORT_SYMBOL(strnlen_user); |
| 1da177e4 LT |
224 | |
| 225 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
| 226 | static unsigned long | |
| 227 | __copy_user_intel(void __user *to, const void *from, unsigned long size) | |
| 228 | { | |
| 229 | int d0, d1; | |
| 230 | __asm__ __volatile__( | |
| 231 | " .align 2,0x90\n" | |
| 232 | "1: movl 32(%4), %%eax\n" | |
| 233 | " cmpl $67, %0\n" | |
| 234 | " jbe 3f\n" | |
| 235 | "2: movl 64(%4), %%eax\n" | |
| 236 | " .align 2,0x90\n" | |
| 237 | "3: movl 0(%4), %%eax\n" | |
| 238 | "4: movl 4(%4), %%edx\n" | |
| 239 | "5: movl %%eax, 0(%3)\n" | |
| 240 | "6: movl %%edx, 4(%3)\n" | |
| 241 | "7: movl 8(%4), %%eax\n" | |
| 242 | "8: movl 12(%4),%%edx\n" | |
| 243 | "9: movl %%eax, 8(%3)\n" | |
| 244 | "10: movl %%edx, 12(%3)\n" | |
| 245 | "11: movl 16(%4), %%eax\n" | |
| 246 | "12: movl 20(%4), %%edx\n" | |
| 247 | "13: movl %%eax, 16(%3)\n" | |
| 248 | "14: movl %%edx, 20(%3)\n" | |
| 249 | "15: movl 24(%4), %%eax\n" | |
| 250 | "16: movl 28(%4), %%edx\n" | |
| 251 | "17: movl %%eax, 24(%3)\n" | |
| 252 | "18: movl %%edx, 28(%3)\n" | |
| 253 | "19: movl 32(%4), %%eax\n" | |
| 254 | "20: movl 36(%4), %%edx\n" | |
| 255 | "21: movl %%eax, 32(%3)\n" | |
| 256 | "22: movl %%edx, 36(%3)\n" | |
| 257 | "23: movl 40(%4), %%eax\n" | |
| 258 | "24: movl 44(%4), %%edx\n" | |
| 259 | "25: movl %%eax, 40(%3)\n" | |
| 260 | "26: movl %%edx, 44(%3)\n" | |
| 261 | "27: movl 48(%4), %%eax\n" | |
| 262 | "28: movl 52(%4), %%edx\n" | |
| 263 | "29: movl %%eax, 48(%3)\n" | |
| 264 | "30: movl %%edx, 52(%3)\n" | |
| 265 | "31: movl 56(%4), %%eax\n" | |
| 266 | "32: movl 60(%4), %%edx\n" | |
| 267 | "33: movl %%eax, 56(%3)\n" | |
| 268 | "34: movl %%edx, 60(%3)\n" | |
| 269 | " addl $-64, %0\n" | |
| 270 | " addl $64, %4\n" | |
| 271 | " addl $64, %3\n" | |
| 272 | " cmpl $63, %0\n" | |
| 273 | " ja 1b\n" | |
| 274 | "35: movl %0, %%eax\n" | |
| 275 | " shrl $2, %0\n" | |
| 276 | " andl $3, %%eax\n" | |
| 277 | " cld\n" | |
| 278 | "99: rep; movsl\n" | |
| 279 | "36: movl %%eax, %0\n" | |
| 280 | "37: rep; movsb\n" | |
| 281 | "100:\n" | |
| 282 | ".section .fixup,\"ax\"\n" | |
| 283 | "101: lea 0(%%eax,%0,4),%0\n" | |
| 284 | " jmp 100b\n" | |
| 285 | ".previous\n" | |
| 286 | ".section __ex_table,\"a\"\n" | |
| 287 | " .align 4\n" | |
| 288 | " .long 1b,100b\n" | |
| 289 | " .long 2b,100b\n" | |
| 290 | " .long 3b,100b\n" | |
| 291 | " .long 4b,100b\n" | |
| 292 | " .long 5b,100b\n" | |
| 293 | " .long 6b,100b\n" | |
| 294 | " .long 7b,100b\n" | |
| 295 | " .long 8b,100b\n" | |
| 296 | " .long 9b,100b\n" | |
| 297 | " .long 10b,100b\n" | |
| 298 | " .long 11b,100b\n" | |
| 299 | " .long 12b,100b\n" | |
| 300 | " .long 13b,100b\n" | |
| 301 | " .long 14b,100b\n" | |
| 302 | " .long 15b,100b\n" | |
| 303 | " .long 16b,100b\n" | |
| 304 | " .long 17b,100b\n" | |
| 305 | " .long 18b,100b\n" | |
| 306 | " .long 19b,100b\n" | |
| 307 | " .long 20b,100b\n" | |
| 308 | " .long 21b,100b\n" | |
| 309 | " .long 22b,100b\n" | |
| 310 | " .long 23b,100b\n" | |
| 311 | " .long 24b,100b\n" | |
| 312 | " .long 25b,100b\n" | |
| 313 | " .long 26b,100b\n" | |
| 314 | " .long 27b,100b\n" | |
| 315 | " .long 28b,100b\n" | |
| 316 | " .long 29b,100b\n" | |
| 317 | " .long 30b,100b\n" | |
| 318 | " .long 31b,100b\n" | |
| 319 | " .long 32b,100b\n" | |
| 320 | " .long 33b,100b\n" | |
| 321 | " .long 34b,100b\n" | |
| 322 | " .long 35b,100b\n" | |
| 323 | " .long 36b,100b\n" | |
| 324 | " .long 37b,100b\n" | |
| 325 | " .long 99b,101b\n" | |
| 326 | ".previous" | |
| 327 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 328 | : "1"(to), "2"(from), "0"(size) | |
| 329 | : "eax", "edx", "memory"); | |
| 330 | return size; | |
| 331 | } | |
| 332 | ||
| 333 | static unsigned long | |
| 334 | __copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size) | |
| 335 | { | |
| 336 | int d0, d1; | |
| 337 | __asm__ __volatile__( | |
| 338 | " .align 2,0x90\n" | |
| 339 | "0: movl 32(%4), %%eax\n" | |
| 340 | " cmpl $67, %0\n" | |
| 341 | " jbe 2f\n" | |
| 342 | "1: movl 64(%4), %%eax\n" | |
| 343 | " .align 2,0x90\n" | |
| 344 | "2: movl 0(%4), %%eax\n" | |
| 345 | "21: movl 4(%4), %%edx\n" | |
| 346 | " movl %%eax, 0(%3)\n" | |
| 347 | " movl %%edx, 4(%3)\n" | |
| 348 | "3: movl 8(%4), %%eax\n" | |
| 349 | "31: movl 12(%4),%%edx\n" | |
| 350 | " movl %%eax, 8(%3)\n" | |
| 351 | " movl %%edx, 12(%3)\n" | |
| 352 | "4: movl 16(%4), %%eax\n" | |
| 353 | "41: movl 20(%4), %%edx\n" | |
| 354 | " movl %%eax, 16(%3)\n" | |
| 355 | " movl %%edx, 20(%3)\n" | |
| 356 | "10: movl 24(%4), %%eax\n" | |
| 357 | "51: movl 28(%4), %%edx\n" | |
| 358 | " movl %%eax, 24(%3)\n" | |
| 359 | " movl %%edx, 28(%3)\n" | |
| 360 | "11: movl 32(%4), %%eax\n" | |
| 361 | "61: movl 36(%4), %%edx\n" | |
| 362 | " movl %%eax, 32(%3)\n" | |
| 363 | " movl %%edx, 36(%3)\n" | |
| 364 | "12: movl 40(%4), %%eax\n" | |
| 365 | "71: movl 44(%4), %%edx\n" | |
| 366 | " movl %%eax, 40(%3)\n" | |
| 367 | " movl %%edx, 44(%3)\n" | |
| 368 | "13: movl 48(%4), %%eax\n" | |
| 369 | "81: movl 52(%4), %%edx\n" | |
| 370 | " movl %%eax, 48(%3)\n" | |
| 371 | " movl %%edx, 52(%3)\n" | |
| 372 | "14: movl 56(%4), %%eax\n" | |
| 373 | "91: movl 60(%4), %%edx\n" | |
| 374 | " movl %%eax, 56(%3)\n" | |
| 375 | " movl %%edx, 60(%3)\n" | |
| 376 | " addl $-64, %0\n" | |
| 377 | " addl $64, %4\n" | |
| 378 | " addl $64, %3\n" | |
| 379 | " cmpl $63, %0\n" | |
| 380 | " ja 0b\n" | |
| 381 | "5: movl %0, %%eax\n" | |
| 382 | " shrl $2, %0\n" | |
| 383 | " andl $3, %%eax\n" | |
| 384 | " cld\n" | |
| 385 | "6: rep; movsl\n" | |
| 386 | " movl %%eax,%0\n" | |
| 387 | "7: rep; movsb\n" | |
| 388 | "8:\n" | |
| 389 | ".section .fixup,\"ax\"\n" | |
| 390 | "9: lea 0(%%eax,%0,4),%0\n" | |
| 391 | "16: pushl %0\n" | |
| 392 | " pushl %%eax\n" | |
| 393 | " xorl %%eax,%%eax\n" | |
| 394 | " rep; stosb\n" | |
| 395 | " popl %%eax\n" | |
| 396 | " popl %0\n" | |
| 397 | " jmp 8b\n" | |
| 398 | ".previous\n" | |
| 399 | ".section __ex_table,\"a\"\n" | |
| 400 | " .align 4\n" | |
| 401 | " .long 0b,16b\n" | |
| 402 | " .long 1b,16b\n" | |
| 403 | " .long 2b,16b\n" | |
| 404 | " .long 21b,16b\n" | |
| 405 | " .long 3b,16b\n" | |
| 406 | " .long 31b,16b\n" | |
| 407 | " .long 4b,16b\n" | |
| 408 | " .long 41b,16b\n" | |
| 409 | " .long 10b,16b\n" | |
| 410 | " .long 51b,16b\n" | |
| 411 | " .long 11b,16b\n" | |
| 412 | " .long 61b,16b\n" | |
| 413 | " .long 12b,16b\n" | |
| 414 | " .long 71b,16b\n" | |
| 415 | " .long 13b,16b\n" | |
| 416 | " .long 81b,16b\n" | |
| 417 | " .long 14b,16b\n" | |
| 418 | " .long 91b,16b\n" | |
| 419 | " .long 6b,9b\n" | |
| 420 | " .long 7b,16b\n" | |
| 421 | ".previous" | |
| 422 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 423 | : "1"(to), "2"(from), "0"(size) | |
| 424 | : "eax", "edx", "memory"); | |
| 425 | return size; | |
| 426 | } | |
| c22ce143 HY |
427 | |
| 428 | /* | |
| 429 | * Non Temporal Hint version of __copy_user_zeroing_intel. It is cache aware. | |
| 430 | * hyoshiok@miraclelinux.com | |
| 431 | */ | |
| 432 | ||
| 433 | static unsigned long __copy_user_zeroing_intel_nocache(void *to, | |
| 434 | const void __user *from, unsigned long size) | |
| 435 | { | |
| 436 | int d0, d1; | |
| 437 | ||
| 438 | __asm__ __volatile__( | |
| 439 | " .align 2,0x90\n" | |
| 440 | "0: movl 32(%4), %%eax\n" | |
| 441 | " cmpl $67, %0\n" | |
| 442 | " jbe 2f\n" | |
| 443 | "1: movl 64(%4), %%eax\n" | |
| 444 | " .align 2,0x90\n" | |
| 445 | "2: movl 0(%4), %%eax\n" | |
| 446 | "21: movl 4(%4), %%edx\n" | |
| 447 | " movnti %%eax, 0(%3)\n" | |
| 448 | " movnti %%edx, 4(%3)\n" | |
| 449 | "3: movl 8(%4), %%eax\n" | |
| 450 | "31: movl 12(%4),%%edx\n" | |
| 451 | " movnti %%eax, 8(%3)\n" | |
| 452 | " movnti %%edx, 12(%3)\n" | |
| 453 | "4: movl 16(%4), %%eax\n" | |
| 454 | "41: movl 20(%4), %%edx\n" | |
| 455 | " movnti %%eax, 16(%3)\n" | |
| 456 | " movnti %%edx, 20(%3)\n" | |
| 457 | "10: movl 24(%4), %%eax\n" | |
| 458 | "51: movl 28(%4), %%edx\n" | |
| 459 | " movnti %%eax, 24(%3)\n" | |
| 460 | " movnti %%edx, 28(%3)\n" | |
| 461 | "11: movl 32(%4), %%eax\n" | |
| 462 | "61: movl 36(%4), %%edx\n" | |
| 463 | " movnti %%eax, 32(%3)\n" | |
| 464 | " movnti %%edx, 36(%3)\n" | |
| 465 | "12: movl 40(%4), %%eax\n" | |
| 466 | "71: movl 44(%4), %%edx\n" | |
| 467 | " movnti %%eax, 40(%3)\n" | |
| 468 | " movnti %%edx, 44(%3)\n" | |
| 469 | "13: movl 48(%4), %%eax\n" | |
| 470 | "81: movl 52(%4), %%edx\n" | |
| 471 | " movnti %%eax, 48(%3)\n" | |
| 472 | " movnti %%edx, 52(%3)\n" | |
| 473 | "14: movl 56(%4), %%eax\n" | |
| 474 | "91: movl 60(%4), %%edx\n" | |
| 475 | " movnti %%eax, 56(%3)\n" | |
| 476 | " movnti %%edx, 60(%3)\n" | |
| 477 | " addl $-64, %0\n" | |
| 478 | " addl $64, %4\n" | |
| 479 | " addl $64, %3\n" | |
| 480 | " cmpl $63, %0\n" | |
| 481 | " ja 0b\n" | |
| 482 | " sfence \n" | |
| 483 | "5: movl %0, %%eax\n" | |
| 484 | " shrl $2, %0\n" | |
| 485 | " andl $3, %%eax\n" | |
| 486 | " cld\n" | |
| 487 | "6: rep; movsl\n" | |
| 488 | " movl %%eax,%0\n" | |
| 489 | "7: rep; movsb\n" | |
| 490 | "8:\n" | |
| 491 | ".section .fixup,\"ax\"\n" | |
| 492 | "9: lea 0(%%eax,%0,4),%0\n" | |
| 493 | "16: pushl %0\n" | |
| 494 | " pushl %%eax\n" | |
| 495 | " xorl %%eax,%%eax\n" | |
| 496 | " rep; stosb\n" | |
| 497 | " popl %%eax\n" | |
| 498 | " popl %0\n" | |
| 499 | " jmp 8b\n" | |
| 500 | ".previous\n" | |
| 501 | ".section __ex_table,\"a\"\n" | |
| 502 | " .align 4\n" | |
| 503 | " .long 0b,16b\n" | |
| 504 | " .long 1b,16b\n" | |
| 505 | " .long 2b,16b\n" | |
| 506 | " .long 21b,16b\n" | |
| 507 | " .long 3b,16b\n" | |
| 508 | " .long 31b,16b\n" | |
| 509 | " .long 4b,16b\n" | |
| 510 | " .long 41b,16b\n" | |
| 511 | " .long 10b,16b\n" | |
| 512 | " .long 51b,16b\n" | |
| 513 | " .long 11b,16b\n" | |
| 514 | " .long 61b,16b\n" | |
| 515 | " .long 12b,16b\n" | |
| 516 | " .long 71b,16b\n" | |
| 517 | " .long 13b,16b\n" | |
| 518 | " .long 81b,16b\n" | |
| 519 | " .long 14b,16b\n" | |
| 520 | " .long 91b,16b\n" | |
| 521 | " .long 6b,9b\n" | |
| 522 | " .long 7b,16b\n" | |
| 523 | ".previous" | |
| 524 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 525 | : "1"(to), "2"(from), "0"(size) | |
| 526 | : "eax", "edx", "memory"); | |
| 527 | return size; | |
| 528 | } | |
| 529 | ||
| 7c12d811 N |
530 | static unsigned long __copy_user_intel_nocache(void *to, |
| 531 | const void __user *from, unsigned long size) | |
| 532 | { | |
| 533 | int d0, d1; | |
| 534 | ||
| 535 | __asm__ __volatile__( | |
| 536 | " .align 2,0x90\n" | |
| 537 | "0: movl 32(%4), %%eax\n" | |
| 538 | " cmpl $67, %0\n" | |
| 539 | " jbe 2f\n" | |
| 540 | "1: movl 64(%4), %%eax\n" | |
| 541 | " .align 2,0x90\n" | |
| 542 | "2: movl 0(%4), %%eax\n" | |
| 543 | "21: movl 4(%4), %%edx\n" | |
| 544 | " movnti %%eax, 0(%3)\n" | |
| 545 | " movnti %%edx, 4(%3)\n" | |
| 546 | "3: movl 8(%4), %%eax\n" | |
| 547 | "31: movl 12(%4),%%edx\n" | |
| 548 | " movnti %%eax, 8(%3)\n" | |
| 549 | " movnti %%edx, 12(%3)\n" | |
| 550 | "4: movl 16(%4), %%eax\n" | |
| 551 | "41: movl 20(%4), %%edx\n" | |
| 552 | " movnti %%eax, 16(%3)\n" | |
| 553 | " movnti %%edx, 20(%3)\n" | |
| 554 | "10: movl 24(%4), %%eax\n" | |
| 555 | "51: movl 28(%4), %%edx\n" | |
| 556 | " movnti %%eax, 24(%3)\n" | |
| 557 | " movnti %%edx, 28(%3)\n" | |
| 558 | "11: movl 32(%4), %%eax\n" | |
| 559 | "61: movl 36(%4), %%edx\n" | |
| 560 | " movnti %%eax, 32(%3)\n" | |
| 561 | " movnti %%edx, 36(%3)\n" | |
| 562 | "12: movl 40(%4), %%eax\n" | |
| 563 | "71: movl 44(%4), %%edx\n" | |
| 564 | " movnti %%eax, 40(%3)\n" | |
| 565 | " movnti %%edx, 44(%3)\n" | |
| 566 | "13: movl 48(%4), %%eax\n" | |
| 567 | "81: movl 52(%4), %%edx\n" | |
| 568 | " movnti %%eax, 48(%3)\n" | |
| 569 | " movnti %%edx, 52(%3)\n" | |
| 570 | "14: movl 56(%4), %%eax\n" | |
| 571 | "91: movl 60(%4), %%edx\n" | |
| 572 | " movnti %%eax, 56(%3)\n" | |
| 573 | " movnti %%edx, 60(%3)\n" | |
| 574 | " addl $-64, %0\n" | |
| 575 | " addl $64, %4\n" | |
| 576 | " addl $64, %3\n" | |
| 577 | " cmpl $63, %0\n" | |
| 578 | " ja 0b\n" | |
| 579 | " sfence \n" | |
| 580 | "5: movl %0, %%eax\n" | |
| 581 | " shrl $2, %0\n" | |
| 582 | " andl $3, %%eax\n" | |
| 583 | " cld\n" | |
| 584 | "6: rep; movsl\n" | |
| 585 | " movl %%eax,%0\n" | |
| 586 | "7: rep; movsb\n" | |
| 587 | "8:\n" | |
| 588 | ".section .fixup,\"ax\"\n" | |
| 589 | "9: lea 0(%%eax,%0,4),%0\n" | |
| 590 | "16: jmp 8b\n" | |
| 591 | ".previous\n" | |
| 592 | ".section __ex_table,\"a\"\n" | |
| 593 | " .align 4\n" | |
| 594 | " .long 0b,16b\n" | |
| 595 | " .long 1b,16b\n" | |
| 596 | " .long 2b,16b\n" | |
| 597 | " .long 21b,16b\n" | |
| 598 | " .long 3b,16b\n" | |
| 599 | " .long 31b,16b\n" | |
| 600 | " .long 4b,16b\n" | |
| 601 | " .long 41b,16b\n" | |
| 602 | " .long 10b,16b\n" | |
| 603 | " .long 51b,16b\n" | |
| 604 | " .long 11b,16b\n" | |
| 605 | " .long 61b,16b\n" | |
| 606 | " .long 12b,16b\n" | |
| 607 | " .long 71b,16b\n" | |
| 608 | " .long 13b,16b\n" | |
| 609 | " .long 81b,16b\n" | |
| 610 | " .long 14b,16b\n" | |
| 611 | " .long 91b,16b\n" | |
| 612 | " .long 6b,9b\n" | |
| 613 | " .long 7b,16b\n" | |
| 614 | ".previous" | |
| 615 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 616 | : "1"(to), "2"(from), "0"(size) | |
| 617 | : "eax", "edx", "memory"); | |
| 618 | return size; | |
| 619 | } | |
| 620 | ||
| 1da177e4 | 621 | #else |
| c22ce143 | 622 | |
| 1da177e4 LT |
623 | /* |
| 624 | * Leave these declared but undefined. They should not be any references to | |
| 625 | * them | |
| 626 | */ | |
| c22ce143 HY |
627 | unsigned long __copy_user_zeroing_intel(void *to, const void __user *from, |
| 628 | unsigned long size); | |
| 629 | unsigned long __copy_user_intel(void __user *to, const void *from, | |
| 630 | unsigned long size); | |
| 631 | unsigned long __copy_user_zeroing_intel_nocache(void *to, | |
| 632 | const void __user *from, unsigned long size); | |
| 1da177e4 LT |
633 | #endif /* CONFIG_X86_INTEL_USERCOPY */ |
| 634 | ||
| 635 | /* Generic arbitrary sized copy. */ | |
| 636 | #define __copy_user(to,from,size) \ | |
| 637 | do { \ | |
| 638 | int __d0, __d1, __d2; \ | |
| 639 | __asm__ __volatile__( \ | |
| 640 | " cmp $7,%0\n" \ | |
| 641 | " jbe 1f\n" \ | |
| 642 | " movl %1,%0\n" \ | |
| 643 | " negl %0\n" \ | |
| 644 | " andl $7,%0\n" \ | |
| 645 | " subl %0,%3\n" \ | |
| 646 | "4: rep; movsb\n" \ | |
| 647 | " movl %3,%0\n" \ | |
| 648 | " shrl $2,%0\n" \ | |
| 649 | " andl $3,%3\n" \ | |
| 650 | " .align 2,0x90\n" \ | |
| 651 | "0: rep; movsl\n" \ | |
| 652 | " movl %3,%0\n" \ | |
| 653 | "1: rep; movsb\n" \ | |
| 654 | "2:\n" \ | |
| 655 | ".section .fixup,\"ax\"\n" \ | |
| 656 | "5: addl %3,%0\n" \ | |
| 657 | " jmp 2b\n" \ | |
| 658 | "3: lea 0(%3,%0,4),%0\n" \ | |
| 659 | " jmp 2b\n" \ | |
| 660 | ".previous\n" \ | |
| 661 | ".section __ex_table,\"a\"\n" \ | |
| 662 | " .align 4\n" \ | |
| 663 | " .long 4b,5b\n" \ | |
| 664 | " .long 0b,3b\n" \ | |
| 665 | " .long 1b,2b\n" \ | |
| 666 | ".previous" \ | |
| 667 | : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ | |
| 668 | : "3"(size), "0"(size), "1"(to), "2"(from) \ | |
| 669 | : "memory"); \ | |
| 670 | } while (0) | |
| 671 | ||
| 672 | #define __copy_user_zeroing(to,from,size) \ | |
| 673 | do { \ | |
| 674 | int __d0, __d1, __d2; \ | |
| 675 | __asm__ __volatile__( \ | |
| 676 | " cmp $7,%0\n" \ | |
| 677 | " jbe 1f\n" \ | |
| 678 | " movl %1,%0\n" \ | |
| 679 | " negl %0\n" \ | |
| 680 | " andl $7,%0\n" \ | |
| 681 | " subl %0,%3\n" \ | |
| 682 | "4: rep; movsb\n" \ | |
| 683 | " movl %3,%0\n" \ | |
| 684 | " shrl $2,%0\n" \ | |
| 685 | " andl $3,%3\n" \ | |
| 686 | " .align 2,0x90\n" \ | |
| 687 | "0: rep; movsl\n" \ | |
| 688 | " movl %3,%0\n" \ | |
| 689 | "1: rep; movsb\n" \ | |
| 690 | "2:\n" \ | |
| 691 | ".section .fixup,\"ax\"\n" \ | |
| 692 | "5: addl %3,%0\n" \ | |
| 693 | " jmp 6f\n" \ | |
| 694 | "3: lea 0(%3,%0,4),%0\n" \ | |
| 695 | "6: pushl %0\n" \ | |
| 696 | " pushl %%eax\n" \ | |
| 697 | " xorl %%eax,%%eax\n" \ | |
| 698 | " rep; stosb\n" \ | |
| 699 | " popl %%eax\n" \ | |
| 700 | " popl %0\n" \ | |
| 701 | " jmp 2b\n" \ | |
| 702 | ".previous\n" \ | |
| 703 | ".section __ex_table,\"a\"\n" \ | |
| 704 | " .align 4\n" \ | |
| 705 | " .long 4b,5b\n" \ | |
| 706 | " .long 0b,3b\n" \ | |
| 707 | " .long 1b,6b\n" \ | |
| 708 | ".previous" \ | |
| 709 | : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ | |
| 710 | : "3"(size), "0"(size), "1"(to), "2"(from) \ | |
| 711 | : "memory"); \ | |
| 712 | } while (0) | |
| 713 | ||
| c22ce143 HY |
714 | unsigned long __copy_to_user_ll(void __user *to, const void *from, |
| 715 | unsigned long n) | |
| 1da177e4 LT |
716 | { |
| 717 | BUG_ON((long) n < 0); | |
| 718 | #ifndef CONFIG_X86_WP_WORKS_OK | |
| 719 | if (unlikely(boot_cpu_data.wp_works_ok == 0) && | |
| 720 | ((unsigned long )to) < TASK_SIZE) { | |
| 721 | /* | |
| 722 | * CPU does not honor the WP bit when writing | |
| 723 | * from supervisory mode, and due to preemption or SMP, | |
| 724 | * the page tables can change at any time. | |
| 725 | * Do it manually. Manfred <manfred@colorfullife.com> | |
| 726 | */ | |
| 727 | while (n) { | |
| 728 | unsigned long offset = ((unsigned long)to)%PAGE_SIZE; | |
| 729 | unsigned long len = PAGE_SIZE - offset; | |
| 730 | int retval; | |
| 731 | struct page *pg; | |
| 732 | void *maddr; | |
| 733 | ||
| 734 | if (len > n) | |
| 735 | len = n; | |
| 736 | ||
| 737 | survive: | |
| 738 | down_read(¤t->mm->mmap_sem); | |
| 739 | retval = get_user_pages(current, current->mm, | |
| 740 | (unsigned long )to, 1, 1, 0, &pg, NULL); | |
| 741 | ||
| f400e198 | 742 | if (retval == -ENOMEM && is_init(current)) { |
| 1da177e4 LT |
743 | up_read(¤t->mm->mmap_sem); |
| 744 | blk_congestion_wait(WRITE, HZ/50); | |
| 745 | goto survive; | |
| 746 | } | |
| 747 | ||
| 748 | if (retval != 1) { | |
| 749 | up_read(¤t->mm->mmap_sem); | |
| 750 | break; | |
| 751 | } | |
| 752 | ||
| 753 | maddr = kmap_atomic(pg, KM_USER0); | |
| 754 | memcpy(maddr + offset, from, len); | |
| 755 | kunmap_atomic(maddr, KM_USER0); | |
| 756 | set_page_dirty_lock(pg); | |
| 757 | put_page(pg); | |
| 758 | up_read(¤t->mm->mmap_sem); | |
| 759 | ||
| 760 | from += len; | |
| 761 | to += len; | |
| 762 | n -= len; | |
| 763 | } | |
| 764 | return n; | |
| 765 | } | |
| 766 | #endif | |
| 767 | if (movsl_is_ok(to, from, n)) | |
| 768 | __copy_user(to, from, n); | |
| 769 | else | |
| 770 | n = __copy_user_intel(to, from, n); | |
| 771 | return n; | |
| 772 | } | |
| 129f6946 | 773 | EXPORT_SYMBOL(__copy_to_user_ll); |
| 1da177e4 | 774 | |
| c22ce143 HY |
775 | unsigned long __copy_from_user_ll(void *to, const void __user *from, |
| 776 | unsigned long n) | |
| 1da177e4 LT |
777 | { |
| 778 | BUG_ON((long)n < 0); | |
| 779 | if (movsl_is_ok(to, from, n)) | |
| 780 | __copy_user_zeroing(to, from, n); | |
| 781 | else | |
| 782 | n = __copy_user_zeroing_intel(to, from, n); | |
| 783 | return n; | |
| 784 | } | |
| 129f6946 | 785 | EXPORT_SYMBOL(__copy_from_user_ll); |
| 1da177e4 | 786 | |
| 7c12d811 N |
787 | unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from, |
| 788 | unsigned long n) | |
| 789 | { | |
| 790 | BUG_ON((long)n < 0); | |
| 791 | if (movsl_is_ok(to, from, n)) | |
| 792 | __copy_user(to, from, n); | |
| 793 | else | |
| 794 | n = __copy_user_intel((void __user *)to, | |
| 795 | (const void *)from, n); | |
| 796 | return n; | |
| 797 | } | |
| 798 | EXPORT_SYMBOL(__copy_from_user_ll_nozero); | |
| 799 | ||
| c22ce143 HY |
800 | unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from, |
| 801 | unsigned long n) | |
| 802 | { | |
| 803 | BUG_ON((long)n < 0); | |
| 804 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
| 805 | if ( n > 64 && cpu_has_xmm2) | |
| 806 | n = __copy_user_zeroing_intel_nocache(to, from, n); | |
| 807 | else | |
| 808 | __copy_user_zeroing(to, from, n); | |
| 809 | #else | |
| 810 | __copy_user_zeroing(to, from, n); | |
| 811 | #endif | |
| 812 | return n; | |
| 813 | } | |
| 814 | ||
| 7c12d811 N |
815 | unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from, |
| 816 | unsigned long n) | |
| 817 | { | |
| 818 | BUG_ON((long)n < 0); | |
| 819 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
| 820 | if ( n > 64 && cpu_has_xmm2) | |
| 821 | n = __copy_user_intel_nocache(to, from, n); | |
| 822 | else | |
| 823 | __copy_user(to, from, n); | |
| 824 | #else | |
| 825 | __copy_user(to, from, n); | |
| 826 | #endif | |
| 827 | return n; | |
| 828 | } | |
| 829 | ||
| 1da177e4 LT |
830 | /** |
| 831 | * copy_to_user: - Copy a block of data into user space. | |
| 832 | * @to: Destination address, in user space. | |
| 833 | * @from: Source address, in kernel space. | |
| 834 | * @n: Number of bytes to copy. | |
| 835 | * | |
| 836 | * Context: User context only. This function may sleep. | |
| 837 | * | |
| 838 | * Copy data from kernel space to user space. | |
| 839 | * | |
| 840 | * Returns number of bytes that could not be copied. | |
| 841 | * On success, this will be zero. | |
| 842 | */ | |
| 843 | unsigned long | |
| 844 | copy_to_user(void __user *to, const void *from, unsigned long n) | |
| 845 | { | |
| 1da177e4 LT |
846 | BUG_ON((long) n < 0); |
| 847 | if (access_ok(VERIFY_WRITE, to, n)) | |
| 848 | n = __copy_to_user(to, from, n); | |
| 849 | return n; | |
| 850 | } | |
| 851 | EXPORT_SYMBOL(copy_to_user); | |
| 852 | ||
| 853 | /** | |
| 854 | * copy_from_user: - Copy a block of data from user space. | |
| 855 | * @to: Destination address, in kernel space. | |
| 856 | * @from: Source address, in user space. | |
| 857 | * @n: Number of bytes to copy. | |
| 858 | * | |
| 859 | * Context: User context only. This function may sleep. | |
| 860 | * | |
| 861 | * Copy data from user space to kernel space. | |
| 862 | * | |
| 863 | * Returns number of bytes that could not be copied. | |
| 864 | * On success, this will be zero. | |
| 865 | * | |
| 866 | * If some data could not be copied, this function will pad the copied | |
| 867 | * data to the requested size using zero bytes. | |
| 868 | */ | |
| 869 | unsigned long | |
| 870 | copy_from_user(void *to, const void __user *from, unsigned long n) | |
| 871 | { | |
| 1da177e4 LT |
872 | BUG_ON((long) n < 0); |
| 873 | if (access_ok(VERIFY_READ, from, n)) | |
| 874 | n = __copy_from_user(to, from, n); | |
| 875 | else | |
| 876 | memset(to, 0, n); | |
| 877 | return n; | |
| 878 | } | |
| 879 | EXPORT_SYMBOL(copy_from_user); |