projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3f50dbc1 | 1 | /* |
| 1da177e4 LT |
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> | |
| 3fcfab16 | 12 | #include <linux/backing-dev.h> |
| b6a8b316 | 13 | #include <linux/interrupt.h> |
| 1da177e4 LT |
14 | #include <asm/uaccess.h> |
| 15 | #include <asm/mmx.h> | |
| 16 | ||
| 8bfcb396 TP |
17 | #ifdef CONFIG_X86_INTEL_USERCOPY |
| 18 | /* | |
| 19 | * Alignment at which movsl is preferred for bulk memory copies. | |
| 20 | */ | |
| 21 | struct movsl_mask movsl_mask __read_mostly; | |
| 22 | #endif | |
| 23 | ||
| 1da177e4 LT |
24 | static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n) |
| 25 | { | |
| 26 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
| 27 | if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask)) | |
| 28 | return 0; | |
| 29 | #endif | |
| 30 | return 1; | |
| 31 | } | |
| 3f50dbc1 PC |
32 | #define movsl_is_ok(a1, a2, n) \ |
| 33 | __movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n)) | |
| 1da177e4 | 34 | |
| 1da177e4 LT |
35 | /* |
| 36 | * Zero Userspace | |
| 37 | */ | |
| 38 | ||
| 39 | #define __do_clear_user(addr,size) \ | |
| 40 | do { \ | |
| 41 | int __d0; \ | |
| 3ee1afa3 | 42 | might_fault(); \ |
| 3f50dbc1 | 43 | __asm__ __volatile__( \ |
| 1da177e4 LT |
44 | "0: rep; stosl\n" \ |
| 45 | " movl %2,%0\n" \ | |
| 46 | "1: rep; stosb\n" \ | |
| 47 | "2:\n" \ | |
| 48 | ".section .fixup,\"ax\"\n" \ | |
| 49 | "3: lea 0(%2,%0,4),%0\n" \ | |
| 50 | " jmp 2b\n" \ | |
| 51 | ".previous\n" \ | |
| 28777441 PA |
52 | _ASM_EXTABLE(0b,3b) \ |
| 53 | _ASM_EXTABLE(1b,2b) \ | |
| 1da177e4 LT |
54 | : "=&c"(size), "=&D" (__d0) \ |
| 55 | : "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \ | |
| 56 | } while (0) | |
| 57 | ||
| 58 | /** | |
| 59 | * clear_user: - Zero a block of memory in user space. | |
| 60 | * @to: Destination address, in user space. | |
| 61 | * @n: Number of bytes to zero. | |
| 62 | * | |
| 63 | * Zero a block of memory in user space. | |
| 64 | * | |
| 65 | * Returns number of bytes that could not be cleared. | |
| 66 | * On success, this will be zero. | |
| 67 | */ | |
| 68 | unsigned long | |
| 69 | clear_user(void __user *to, unsigned long n) | |
| 70 | { | |
| 1d18ef48 | 71 | might_fault(); |
| 1da177e4 LT |
72 | if (access_ok(VERIFY_WRITE, to, n)) |
| 73 | __do_clear_user(to, n); | |
| 74 | return n; | |
| 75 | } | |
| 129f6946 | 76 | EXPORT_SYMBOL(clear_user); |
| 1da177e4 LT |
77 | |
| 78 | /** | |
| 79 | * __clear_user: - Zero a block of memory in user space, with less checking. | |
| 80 | * @to: Destination address, in user space. | |
| 81 | * @n: Number of bytes to zero. | |
| 82 | * | |
| 83 | * Zero a block of memory in user space. Caller must check | |
| 84 | * the specified block with access_ok() before calling this function. | |
| 85 | * | |
| 86 | * Returns number of bytes that could not be cleared. | |
| 87 | * On success, this will be zero. | |
| 88 | */ | |
| 89 | unsigned long | |
| 90 | __clear_user(void __user *to, unsigned long n) | |
| 91 | { | |
| 92 | __do_clear_user(to, n); | |
| 93 | return n; | |
| 94 | } | |
| 129f6946 | 95 | EXPORT_SYMBOL(__clear_user); |
| 1da177e4 LT |
96 | |
| 97 | /** | |
| 35e38a6e | 98 | * strnlen_user: - Get the size of a string in user space. |
| 1da177e4 LT |
99 | * @s: The string to measure. |
| 100 | * @n: The maximum valid length | |
| 101 | * | |
| 102 | * Get the size of a NUL-terminated string in user space. | |
| 103 | * | |
| 104 | * Returns the size of the string INCLUDING the terminating NUL. | |
| 105 | * On exception, returns 0. | |
| 106 | * If the string is too long, returns a value greater than @n. | |
| 107 | */ | |
| 108 | long strnlen_user(const char __user *s, long n) | |
| 109 | { | |
| 110 | unsigned long mask = -__addr_ok(s); | |
| 111 | unsigned long res, tmp; | |
| 112 | ||
| 3ee1afa3 | 113 | might_fault(); |
| 1da177e4 LT |
114 | |
| 115 | __asm__ __volatile__( | |
| 116 | " testl %0, %0\n" | |
| 117 | " jz 3f\n" | |
| 118 | " andl %0,%%ecx\n" | |
| 119 | "0: repne; scasb\n" | |
| 120 | " setne %%al\n" | |
| 121 | " subl %%ecx,%0\n" | |
| 122 | " addl %0,%%eax\n" | |
| 123 | "1:\n" | |
| 124 | ".section .fixup,\"ax\"\n" | |
| 125 | "2: xorl %%eax,%%eax\n" | |
| 126 | " jmp 1b\n" | |
| 127 | "3: movb $1,%%al\n" | |
| 128 | " jmp 1b\n" | |
| 129 | ".previous\n" | |
| 130 | ".section __ex_table,\"a\"\n" | |
| 131 | " .align 4\n" | |
| 132 | " .long 0b,2b\n" | |
| 133 | ".previous" | |
| e0a96129 | 134 | :"=&r" (n), "=&D" (s), "=&a" (res), "=&c" (tmp) |
| 1da177e4 LT |
135 | :"0" (n), "1" (s), "2" (0), "3" (mask) |
| 136 | :"cc"); | |
| 137 | return res & mask; | |
| 138 | } | |
| 129f6946 | 139 | EXPORT_SYMBOL(strnlen_user); |
| 1da177e4 LT |
140 | |
| 141 | #ifdef CONFIG_X86_INTEL_USERCOPY | |
| 142 | static unsigned long | |
| 143 | __copy_user_intel(void __user *to, const void *from, unsigned long size) | |
| 144 | { | |
| 145 | int d0, d1; | |
| 146 | __asm__ __volatile__( | |
| 147 | " .align 2,0x90\n" | |
| 148 | "1: movl 32(%4), %%eax\n" | |
| 149 | " cmpl $67, %0\n" | |
| 150 | " jbe 3f\n" | |
| 151 | "2: movl 64(%4), %%eax\n" | |
| 152 | " .align 2,0x90\n" | |
| 153 | "3: movl 0(%4), %%eax\n" | |
| 154 | "4: movl 4(%4), %%edx\n" | |
| 155 | "5: movl %%eax, 0(%3)\n" | |
| 156 | "6: movl %%edx, 4(%3)\n" | |
| 157 | "7: movl 8(%4), %%eax\n" | |
| 158 | "8: movl 12(%4),%%edx\n" | |
| 159 | "9: movl %%eax, 8(%3)\n" | |
| 160 | "10: movl %%edx, 12(%3)\n" | |
| 161 | "11: movl 16(%4), %%eax\n" | |
| 162 | "12: movl 20(%4), %%edx\n" | |
| 163 | "13: movl %%eax, 16(%3)\n" | |
| 164 | "14: movl %%edx, 20(%3)\n" | |
| 165 | "15: movl 24(%4), %%eax\n" | |
| 166 | "16: movl 28(%4), %%edx\n" | |
| 167 | "17: movl %%eax, 24(%3)\n" | |
| 168 | "18: movl %%edx, 28(%3)\n" | |
| 169 | "19: movl 32(%4), %%eax\n" | |
| 170 | "20: movl 36(%4), %%edx\n" | |
| 171 | "21: movl %%eax, 32(%3)\n" | |
| 172 | "22: movl %%edx, 36(%3)\n" | |
| 173 | "23: movl 40(%4), %%eax\n" | |
| 174 | "24: movl 44(%4), %%edx\n" | |
| 175 | "25: movl %%eax, 40(%3)\n" | |
| 176 | "26: movl %%edx, 44(%3)\n" | |
| 177 | "27: movl 48(%4), %%eax\n" | |
| 178 | "28: movl 52(%4), %%edx\n" | |
| 179 | "29: movl %%eax, 48(%3)\n" | |
| 180 | "30: movl %%edx, 52(%3)\n" | |
| 181 | "31: movl 56(%4), %%eax\n" | |
| 182 | "32: movl 60(%4), %%edx\n" | |
| 183 | "33: movl %%eax, 56(%3)\n" | |
| 184 | "34: movl %%edx, 60(%3)\n" | |
| 185 | " addl $-64, %0\n" | |
| 186 | " addl $64, %4\n" | |
| 187 | " addl $64, %3\n" | |
| 188 | " cmpl $63, %0\n" | |
| 189 | " ja 1b\n" | |
| 190 | "35: movl %0, %%eax\n" | |
| 191 | " shrl $2, %0\n" | |
| 192 | " andl $3, %%eax\n" | |
| 193 | " cld\n" | |
| 194 | "99: rep; movsl\n" | |
| 195 | "36: movl %%eax, %0\n" | |
| 196 | "37: rep; movsb\n" | |
| 197 | "100:\n" | |
| 198 | ".section .fixup,\"ax\"\n" | |
| 199 | "101: lea 0(%%eax,%0,4),%0\n" | |
| 200 | " jmp 100b\n" | |
| 201 | ".previous\n" | |
| 202 | ".section __ex_table,\"a\"\n" | |
| 203 | " .align 4\n" | |
| 204 | " .long 1b,100b\n" | |
| 205 | " .long 2b,100b\n" | |
| 206 | " .long 3b,100b\n" | |
| 207 | " .long 4b,100b\n" | |
| 208 | " .long 5b,100b\n" | |
| 209 | " .long 6b,100b\n" | |
| 210 | " .long 7b,100b\n" | |
| 211 | " .long 8b,100b\n" | |
| 212 | " .long 9b,100b\n" | |
| 213 | " .long 10b,100b\n" | |
| 214 | " .long 11b,100b\n" | |
| 215 | " .long 12b,100b\n" | |
| 216 | " .long 13b,100b\n" | |
| 217 | " .long 14b,100b\n" | |
| 218 | " .long 15b,100b\n" | |
| 219 | " .long 16b,100b\n" | |
| 220 | " .long 17b,100b\n" | |
| 221 | " .long 18b,100b\n" | |
| 222 | " .long 19b,100b\n" | |
| 223 | " .long 20b,100b\n" | |
| 224 | " .long 21b,100b\n" | |
| 225 | " .long 22b,100b\n" | |
| 226 | " .long 23b,100b\n" | |
| 227 | " .long 24b,100b\n" | |
| 228 | " .long 25b,100b\n" | |
| 229 | " .long 26b,100b\n" | |
| 230 | " .long 27b,100b\n" | |
| 231 | " .long 28b,100b\n" | |
| 232 | " .long 29b,100b\n" | |
| 233 | " .long 30b,100b\n" | |
| 234 | " .long 31b,100b\n" | |
| 235 | " .long 32b,100b\n" | |
| 236 | " .long 33b,100b\n" | |
| 237 | " .long 34b,100b\n" | |
| 238 | " .long 35b,100b\n" | |
| 239 | " .long 36b,100b\n" | |
| 240 | " .long 37b,100b\n" | |
| 241 | " .long 99b,101b\n" | |
| 242 | ".previous" | |
| 243 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 244 | : "1"(to), "2"(from), "0"(size) | |
| 245 | : "eax", "edx", "memory"); | |
| 246 | return size; | |
| 247 | } | |
| 248 | ||
| 249 | static unsigned long | |
| 250 | __copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size) | |
| 251 | { | |
| 252 | int d0, d1; | |
| 253 | __asm__ __volatile__( | |
| 254 | " .align 2,0x90\n" | |
| 255 | "0: movl 32(%4), %%eax\n" | |
| 3f50dbc1 PC |
256 | " cmpl $67, %0\n" |
| 257 | " jbe 2f\n" | |
| 1da177e4 | 258 | "1: movl 64(%4), %%eax\n" |
| 3f50dbc1 PC |
259 | " .align 2,0x90\n" |
| 260 | "2: movl 0(%4), %%eax\n" | |
| 261 | "21: movl 4(%4), %%edx\n" | |
| 262 | " movl %%eax, 0(%3)\n" | |
| 263 | " movl %%edx, 4(%3)\n" | |
| 264 | "3: movl 8(%4), %%eax\n" | |
| 265 | "31: movl 12(%4),%%edx\n" | |
| 266 | " movl %%eax, 8(%3)\n" | |
| 1da177e4 LT |
267 | " movl %%edx, 12(%3)\n" |
| 268 | "4: movl 16(%4), %%eax\n" | |
| 269 | "41: movl 20(%4), %%edx\n" | |
| 270 | " movl %%eax, 16(%3)\n" | |
| 271 | " movl %%edx, 20(%3)\n" | |
| 272 | "10: movl 24(%4), %%eax\n" | |
| 273 | "51: movl 28(%4), %%edx\n" | |
| 274 | " movl %%eax, 24(%3)\n" | |
| 275 | " movl %%edx, 28(%3)\n" | |
| 276 | "11: movl 32(%4), %%eax\n" | |
| 277 | "61: movl 36(%4), %%edx\n" | |
| 278 | " movl %%eax, 32(%3)\n" | |
| 279 | " movl %%edx, 36(%3)\n" | |
| 280 | "12: movl 40(%4), %%eax\n" | |
| 281 | "71: movl 44(%4), %%edx\n" | |
| 282 | " movl %%eax, 40(%3)\n" | |
| 283 | " movl %%edx, 44(%3)\n" | |
| 284 | "13: movl 48(%4), %%eax\n" | |
| 285 | "81: movl 52(%4), %%edx\n" | |
| 286 | " movl %%eax, 48(%3)\n" | |
| 287 | " movl %%edx, 52(%3)\n" | |
| 288 | "14: movl 56(%4), %%eax\n" | |
| 289 | "91: movl 60(%4), %%edx\n" | |
| 290 | " movl %%eax, 56(%3)\n" | |
| 291 | " movl %%edx, 60(%3)\n" | |
| 3f50dbc1 PC |
292 | " addl $-64, %0\n" |
| 293 | " addl $64, %4\n" | |
| 294 | " addl $64, %3\n" | |
| 295 | " cmpl $63, %0\n" | |
| 296 | " ja 0b\n" | |
| 297 | "5: movl %0, %%eax\n" | |
| 298 | " shrl $2, %0\n" | |
| 299 | " andl $3, %%eax\n" | |
| 300 | " cld\n" | |
| 301 | "6: rep; movsl\n" | |
| 1da177e4 | 302 | " movl %%eax,%0\n" |
| 3f50dbc1 PC |
303 | "7: rep; movsb\n" |
| 304 | "8:\n" | |
| 1da177e4 | 305 | ".section .fixup,\"ax\"\n" |
| 3f50dbc1 PC |
306 | "9: lea 0(%%eax,%0,4),%0\n" |
| 307 | "16: pushl %0\n" | |
| 308 | " pushl %%eax\n" | |
| 1da177e4 | 309 | " xorl %%eax,%%eax\n" |
| 3f50dbc1 PC |
310 | " rep; stosb\n" |
| 311 | " popl %%eax\n" | |
| 312 | " popl %0\n" | |
| 313 | " jmp 8b\n" | |
| 314 | ".previous\n" | |
| 1da177e4 | 315 | ".section __ex_table,\"a\"\n" |
| 3f50dbc1 PC |
316 | " .align 4\n" |
| 317 | " .long 0b,16b\n" | |
| 1da177e4 LT |
318 | " .long 1b,16b\n" |
| 319 | " .long 2b,16b\n" | |
| 320 | " .long 21b,16b\n" | |
| 3f50dbc1 | 321 | " .long 3b,16b\n" |
| 1da177e4 | 322 | " .long 31b,16b\n" |
| 3f50dbc1 | 323 | " .long 4b,16b\n" |
| 1da177e4 LT |
324 | " .long 41b,16b\n" |
| 325 | " .long 10b,16b\n" | |
| 326 | " .long 51b,16b\n" | |
| 327 | " .long 11b,16b\n" | |
| 328 | " .long 61b,16b\n" | |
| 329 | " .long 12b,16b\n" | |
| 330 | " .long 71b,16b\n" | |
| 331 | " .long 13b,16b\n" | |
| 332 | " .long 81b,16b\n" | |
| 333 | " .long 14b,16b\n" | |
| 334 | " .long 91b,16b\n" | |
| 3f50dbc1 PC |
335 | " .long 6b,9b\n" |
| 336 | " .long 7b,16b\n" | |
| 337 | ".previous" | |
| 1da177e4 LT |
338 | : "=&c"(size), "=&D" (d0), "=&S" (d1) |
| 339 | : "1"(to), "2"(from), "0"(size) | |
| 340 | : "eax", "edx", "memory"); | |
| 341 | return size; | |
| 342 | } | |
| c22ce143 HY |
343 | |
| 344 | /* | |
| 345 | * Non Temporal Hint version of __copy_user_zeroing_intel. It is cache aware. | |
| 346 | * hyoshiok@miraclelinux.com | |
| 347 | */ | |
| 348 | ||
| 349 | static unsigned long __copy_user_zeroing_intel_nocache(void *to, | |
| 350 | const void __user *from, unsigned long size) | |
| 351 | { | |
| 3f50dbc1 | 352 | int d0, d1; |
| c22ce143 HY |
353 | |
| 354 | __asm__ __volatile__( | |
| 355 | " .align 2,0x90\n" | |
| 356 | "0: movl 32(%4), %%eax\n" | |
| 357 | " cmpl $67, %0\n" | |
| 358 | " jbe 2f\n" | |
| 359 | "1: movl 64(%4), %%eax\n" | |
| 360 | " .align 2,0x90\n" | |
| 361 | "2: movl 0(%4), %%eax\n" | |
| 362 | "21: movl 4(%4), %%edx\n" | |
| 363 | " movnti %%eax, 0(%3)\n" | |
| 364 | " movnti %%edx, 4(%3)\n" | |
| 365 | "3: movl 8(%4), %%eax\n" | |
| 366 | "31: movl 12(%4),%%edx\n" | |
| 367 | " movnti %%eax, 8(%3)\n" | |
| 368 | " movnti %%edx, 12(%3)\n" | |
| 369 | "4: movl 16(%4), %%eax\n" | |
| 370 | "41: movl 20(%4), %%edx\n" | |
| 371 | " movnti %%eax, 16(%3)\n" | |
| 372 | " movnti %%edx, 20(%3)\n" | |
| 373 | "10: movl 24(%4), %%eax\n" | |
| 374 | "51: movl 28(%4), %%edx\n" | |
| 375 | " movnti %%eax, 24(%3)\n" | |
| 376 | " movnti %%edx, 28(%3)\n" | |
| 377 | "11: movl 32(%4), %%eax\n" | |
| 378 | "61: movl 36(%4), %%edx\n" | |
| 379 | " movnti %%eax, 32(%3)\n" | |
| 380 | " movnti %%edx, 36(%3)\n" | |
| 381 | "12: movl 40(%4), %%eax\n" | |
| 382 | "71: movl 44(%4), %%edx\n" | |
| 383 | " movnti %%eax, 40(%3)\n" | |
| 384 | " movnti %%edx, 44(%3)\n" | |
| 385 | "13: movl 48(%4), %%eax\n" | |
| 386 | "81: movl 52(%4), %%edx\n" | |
| 387 | " movnti %%eax, 48(%3)\n" | |
| 388 | " movnti %%edx, 52(%3)\n" | |
| 389 | "14: movl 56(%4), %%eax\n" | |
| 390 | "91: movl 60(%4), %%edx\n" | |
| 391 | " movnti %%eax, 56(%3)\n" | |
| 392 | " movnti %%edx, 60(%3)\n" | |
| 393 | " addl $-64, %0\n" | |
| 394 | " addl $64, %4\n" | |
| 395 | " addl $64, %3\n" | |
| 396 | " cmpl $63, %0\n" | |
| 397 | " ja 0b\n" | |
| 398 | " sfence \n" | |
| 399 | "5: movl %0, %%eax\n" | |
| 400 | " shrl $2, %0\n" | |
| 401 | " andl $3, %%eax\n" | |
| 402 | " cld\n" | |
| 403 | "6: rep; movsl\n" | |
| 404 | " movl %%eax,%0\n" | |
| 405 | "7: rep; movsb\n" | |
| 406 | "8:\n" | |
| 407 | ".section .fixup,\"ax\"\n" | |
| 408 | "9: lea 0(%%eax,%0,4),%0\n" | |
| 409 | "16: pushl %0\n" | |
| 410 | " pushl %%eax\n" | |
| 411 | " xorl %%eax,%%eax\n" | |
| 412 | " rep; stosb\n" | |
| 413 | " popl %%eax\n" | |
| 414 | " popl %0\n" | |
| 415 | " jmp 8b\n" | |
| 416 | ".previous\n" | |
| 417 | ".section __ex_table,\"a\"\n" | |
| 418 | " .align 4\n" | |
| 419 | " .long 0b,16b\n" | |
| 420 | " .long 1b,16b\n" | |
| 421 | " .long 2b,16b\n" | |
| 422 | " .long 21b,16b\n" | |
| 423 | " .long 3b,16b\n" | |
| 424 | " .long 31b,16b\n" | |
| 425 | " .long 4b,16b\n" | |
| 426 | " .long 41b,16b\n" | |
| 427 | " .long 10b,16b\n" | |
| 428 | " .long 51b,16b\n" | |
| 429 | " .long 11b,16b\n" | |
| 430 | " .long 61b,16b\n" | |
| 431 | " .long 12b,16b\n" | |
| 432 | " .long 71b,16b\n" | |
| 433 | " .long 13b,16b\n" | |
| 434 | " .long 81b,16b\n" | |
| 435 | " .long 14b,16b\n" | |
| 436 | " .long 91b,16b\n" | |
| 437 | " .long 6b,9b\n" | |
| 438 | " .long 7b,16b\n" | |
| 439 | ".previous" | |
| 440 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 441 | : "1"(to), "2"(from), "0"(size) | |
| 442 | : "eax", "edx", "memory"); | |
| 443 | return size; | |
| 444 | } | |
| 445 | ||
| 7c12d811 N |
446 | static unsigned long __copy_user_intel_nocache(void *to, |
| 447 | const void __user *from, unsigned long size) | |
| 448 | { | |
| 3f50dbc1 | 449 | int d0, d1; |
| 7c12d811 N |
450 | |
| 451 | __asm__ __volatile__( | |
| 452 | " .align 2,0x90\n" | |
| 453 | "0: movl 32(%4), %%eax\n" | |
| 454 | " cmpl $67, %0\n" | |
| 455 | " jbe 2f\n" | |
| 456 | "1: movl 64(%4), %%eax\n" | |
| 457 | " .align 2,0x90\n" | |
| 458 | "2: movl 0(%4), %%eax\n" | |
| 459 | "21: movl 4(%4), %%edx\n" | |
| 460 | " movnti %%eax, 0(%3)\n" | |
| 461 | " movnti %%edx, 4(%3)\n" | |
| 462 | "3: movl 8(%4), %%eax\n" | |
| 463 | "31: movl 12(%4),%%edx\n" | |
| 464 | " movnti %%eax, 8(%3)\n" | |
| 465 | " movnti %%edx, 12(%3)\n" | |
| 466 | "4: movl 16(%4), %%eax\n" | |
| 467 | "41: movl 20(%4), %%edx\n" | |
| 468 | " movnti %%eax, 16(%3)\n" | |
| 469 | " movnti %%edx, 20(%3)\n" | |
| 470 | "10: movl 24(%4), %%eax\n" | |
| 471 | "51: movl 28(%4), %%edx\n" | |
| 472 | " movnti %%eax, 24(%3)\n" | |
| 473 | " movnti %%edx, 28(%3)\n" | |
| 474 | "11: movl 32(%4), %%eax\n" | |
| 475 | "61: movl 36(%4), %%edx\n" | |
| 476 | " movnti %%eax, 32(%3)\n" | |
| 477 | " movnti %%edx, 36(%3)\n" | |
| 478 | "12: movl 40(%4), %%eax\n" | |
| 479 | "71: movl 44(%4), %%edx\n" | |
| 480 | " movnti %%eax, 40(%3)\n" | |
| 481 | " movnti %%edx, 44(%3)\n" | |
| 482 | "13: movl 48(%4), %%eax\n" | |
| 483 | "81: movl 52(%4), %%edx\n" | |
| 484 | " movnti %%eax, 48(%3)\n" | |
| 485 | " movnti %%edx, 52(%3)\n" | |
| 486 | "14: movl 56(%4), %%eax\n" | |
| 487 | "91: movl 60(%4), %%edx\n" | |
| 488 | " movnti %%eax, 56(%3)\n" | |
| 489 | " movnti %%edx, 60(%3)\n" | |
| 490 | " addl $-64, %0\n" | |
| 491 | " addl $64, %4\n" | |
| 492 | " addl $64, %3\n" | |
| 493 | " cmpl $63, %0\n" | |
| 494 | " ja 0b\n" | |
| 495 | " sfence \n" | |
| 496 | "5: movl %0, %%eax\n" | |
| 497 | " shrl $2, %0\n" | |
| 498 | " andl $3, %%eax\n" | |
| 499 | " cld\n" | |
| 500 | "6: rep; movsl\n" | |
| 501 | " movl %%eax,%0\n" | |
| 502 | "7: rep; movsb\n" | |
| 503 | "8:\n" | |
| 504 | ".section .fixup,\"ax\"\n" | |
| 505 | "9: lea 0(%%eax,%0,4),%0\n" | |
| 506 | "16: jmp 8b\n" | |
| 507 | ".previous\n" | |
| 508 | ".section __ex_table,\"a\"\n" | |
| 509 | " .align 4\n" | |
| 510 | " .long 0b,16b\n" | |
| 511 | " .long 1b,16b\n" | |
| 512 | " .long 2b,16b\n" | |
| 513 | " .long 21b,16b\n" | |
| 514 | " .long 3b,16b\n" | |
| 515 | " .long 31b,16b\n" | |
| 516 | " .long 4b,16b\n" | |
| 517 | " .long 41b,16b\n" | |
| 518 | " .long 10b,16b\n" | |
| 519 | " .long 51b,16b\n" | |
| 520 | " .long 11b,16b\n" | |
| 521 | " .long 61b,16b\n" | |
| 522 | " .long 12b,16b\n" | |
| 523 | " .long 71b,16b\n" | |
| 524 | " .long 13b,16b\n" | |
| 525 | " .long 81b,16b\n" | |
| 526 | " .long 14b,16b\n" | |
| 527 | " .long 91b,16b\n" | |
| 528 | " .long 6b,9b\n" | |
| 529 | " .long 7b,16b\n" | |
| 530 | ".previous" | |
| 531 | : "=&c"(size), "=&D" (d0), "=&S" (d1) | |
| 532 | : "1"(to), "2"(from), "0"(size) | |
| 533 | : "eax", "edx", "memory"); | |
| 534 | return size; | |
| 535 | } | |
| 536 | ||
| 1da177e4 | 537 | #else |
| c22ce143 | 538 | |
| 1da177e4 LT |
539 | /* |
| 540 | * Leave these declared but undefined. They should not be any references to | |
| 541 | * them | |
| 542 | */ | |
| c22ce143 HY |
543 | unsigned long __copy_user_zeroing_intel(void *to, const void __user *from, |
| 544 | unsigned long size); | |
| 545 | unsigned long __copy_user_intel(void __user *to, const void *from, | |
| 546 | unsigned long size); | |
| 547 | unsigned long __copy_user_zeroing_intel_nocache(void *to, | |
| 548 | const void __user *from, unsigned long size); | |
| 1da177e4 LT |
549 | #endif /* CONFIG_X86_INTEL_USERCOPY */ |
| 550 | ||
| 551 | /* Generic arbitrary sized copy. */ | |
| 3f50dbc1 | 552 | #define __copy_user(to, from, size) \ |
| 1da177e4 LT |
553 | do { \ |
| 554 | int __d0, __d1, __d2; \ | |
| 555 | __asm__ __volatile__( \ | |
| 556 | " cmp $7,%0\n" \ | |
| 557 | " jbe 1f\n" \ | |
| 558 | " movl %1,%0\n" \ | |
| 559 | " negl %0\n" \ | |
| 560 | " andl $7,%0\n" \ | |
| 561 | " subl %0,%3\n" \ | |
| 562 | "4: rep; movsb\n" \ | |
| 563 | " movl %3,%0\n" \ | |
| 564 | " shrl $2,%0\n" \ | |
| 565 | " andl $3,%3\n" \ | |
| 566 | " .align 2,0x90\n" \ | |
| 567 | "0: rep; movsl\n" \ | |
| 568 | " movl %3,%0\n" \ | |
| 569 | "1: rep; movsb\n" \ | |
| 570 | "2:\n" \ | |
| 571 | ".section .fixup,\"ax\"\n" \ | |
| 572 | "5: addl %3,%0\n" \ | |
| 573 | " jmp 2b\n" \ | |
| 574 | "3: lea 0(%3,%0,4),%0\n" \ | |
| 575 | " jmp 2b\n" \ | |
| 576 | ".previous\n" \ | |
| 577 | ".section __ex_table,\"a\"\n" \ | |
| 578 | " .align 4\n" \ | |
| 579 | " .long 4b,5b\n" \ | |
| 580 | " .long 0b,3b\n" \ | |
| 581 | " .long 1b,2b\n" \ | |
| 582 | ".previous" \ | |
| 583 | : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ | |
| 584 | : "3"(size), "0"(size), "1"(to), "2"(from) \ | |
| 585 | : "memory"); \ | |
| 586 | } while (0) | |
| 587 | ||
| 3f50dbc1 | 588 | #define __copy_user_zeroing(to, from, size) \ |
| 1da177e4 LT |
589 | do { \ |
| 590 | int __d0, __d1, __d2; \ | |
| 591 | __asm__ __volatile__( \ | |
| 592 | " cmp $7,%0\n" \ | |
| 593 | " jbe 1f\n" \ | |
| 594 | " movl %1,%0\n" \ | |
| 595 | " negl %0\n" \ | |
| 596 | " andl $7,%0\n" \ | |
| 597 | " subl %0,%3\n" \ | |
| 598 | "4: rep; movsb\n" \ | |
| 599 | " movl %3,%0\n" \ | |
| 600 | " shrl $2,%0\n" \ | |
| 601 | " andl $3,%3\n" \ | |
| 602 | " .align 2,0x90\n" \ | |
| 603 | "0: rep; movsl\n" \ | |
| 604 | " movl %3,%0\n" \ | |
| 605 | "1: rep; movsb\n" \ | |
| 606 | "2:\n" \ | |
| 607 | ".section .fixup,\"ax\"\n" \ | |
| 608 | "5: addl %3,%0\n" \ | |
| 609 | " jmp 6f\n" \ | |
| 610 | "3: lea 0(%3,%0,4),%0\n" \ | |
| 611 | "6: pushl %0\n" \ | |
| 612 | " pushl %%eax\n" \ | |
| 613 | " xorl %%eax,%%eax\n" \ | |
| 614 | " rep; stosb\n" \ | |
| 615 | " popl %%eax\n" \ | |
| 616 | " popl %0\n" \ | |
| 617 | " jmp 2b\n" \ | |
| 618 | ".previous\n" \ | |
| 619 | ".section __ex_table,\"a\"\n" \ | |
| 620 | " .align 4\n" \ | |
| 621 | " .long 4b,5b\n" \ | |
| 622 | " .long 0b,3b\n" \ | |
| 623 | " .long 1b,6b\n" \ | |
| 624 | ".previous" \ | |
| 625 | : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ | |
| 626 | : "3"(size), "0"(size), "1"(to), "2"(from) \ | |
| 627 | : "memory"); \ | |
| 628 | } while (0) | |
| 629 | ||
| c22ce143 HY |
630 | unsigned long __copy_to_user_ll(void __user *to, const void *from, |
| 631 | unsigned long n) | |
| 1da177e4 | 632 | { |
| 1da177e4 LT |
633 | #ifndef CONFIG_X86_WP_WORKS_OK |
| 634 | if (unlikely(boot_cpu_data.wp_works_ok == 0) && | |
| 3f50dbc1 | 635 | ((unsigned long)to) < TASK_SIZE) { |
| b6a8b316 TG |
636 | /* |
| 637 | * When we are in an atomic section (see | |
| 638 | * mm/filemap.c:file_read_actor), return the full | |
| 639 | * length to take the slow path. | |
| 640 | */ | |
| 641 | if (in_atomic()) | |
| 642 | return n; | |
| 643 | ||
| 3f50dbc1 | 644 | /* |
| 1da177e4 LT |
645 | * CPU does not honor the WP bit when writing |
| 646 | * from supervisory mode, and due to preemption or SMP, | |
| 647 | * the page tables can change at any time. | |
| 648 | * Do it manually. Manfred <manfred@colorfullife.com> | |
| 649 | */ | |
| 650 | while (n) { | |
| 3f50dbc1 | 651 | unsigned long offset = ((unsigned long)to)%PAGE_SIZE; |
| 1da177e4 LT |
652 | unsigned long len = PAGE_SIZE - offset; |
| 653 | int retval; | |
| 654 | struct page *pg; | |
| 655 | void *maddr; | |
| 3f50dbc1 | 656 | |
| 1da177e4 LT |
657 | if (len > n) |
| 658 | len = n; | |
| 659 | ||
| 660 | survive: | |
| 661 | down_read(¤t->mm->mmap_sem); | |
| 662 | retval = get_user_pages(current, current->mm, | |
| 3f50dbc1 | 663 | (unsigned long)to, 1, 1, 0, &pg, NULL); |
| 1da177e4 | 664 | |
| b460cbc5 | 665 | if (retval == -ENOMEM && is_global_init(current)) { |
| 1da177e4 | 666 | up_read(¤t->mm->mmap_sem); |
| 8aa7e847 | 667 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
| 1da177e4 LT |
668 | goto survive; |
| 669 | } | |
| 670 | ||
| 671 | if (retval != 1) { | |
| 672 | up_read(¤t->mm->mmap_sem); | |
| 3f50dbc1 PC |
673 | break; |
| 674 | } | |
| 1da177e4 | 675 | |
| 8fd75e12 | 676 | maddr = kmap_atomic(pg); |
| 1da177e4 | 677 | memcpy(maddr + offset, from, len); |
| 8fd75e12 | 678 | kunmap_atomic(maddr); |
| 1da177e4 LT |
679 | set_page_dirty_lock(pg); |
| 680 | put_page(pg); | |
| 681 | up_read(¤t->mm->mmap_sem); | |
| 682 | ||
| 683 | from += len; | |
| 684 | to += len; | |
| 685 | n -= len; | |
| 686 | } | |
| 687 | return n; | |
| 688 | } | |
| 689 | #endif | |
| 690 | if (movsl_is_ok(to, from, n)) | |
| 691 | __copy_user(to, from, n); | |
| 692 | else | |
| 693 | n = __copy_user_intel(to, from, n); | |
| 694 | return n; | |
| 695 | } | |
| 129f6946 | 696 | EXPORT_SYMBOL(__copy_to_user_ll); |
| 1da177e4 | 697 | |
| c22ce143 HY |
698 | unsigned long __copy_from_user_ll(void *to, const void __user *from, |
| 699 | unsigned long n) | |
| 1da177e4 | 700 | { |
| 1da177e4 LT |
701 | if (movsl_is_ok(to, from, n)) |
| 702 | __copy_user_zeroing(to, from, n); | |
| 703 | else | |
| 704 | n = __copy_user_zeroing_intel(to, from, n); | |
| 705 | return n; | |
| 706 | } | |
| 129f6946 | 707 | EXPORT_SYMBOL(__copy_from_user_ll); |
| 1da177e4 | 708 | |
| 7c12d811 N |
709 | unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from, |
| 710 | unsigned long n) | |
| 711 | { | |
| 7c12d811 N |
712 | if (movsl_is_ok(to, from, n)) |
| 713 | __copy_user(to, from, n); | |
| 714 | else | |
| 715 | n = __copy_user_intel((void __user *)to, | |
| 716 | (const void *)from, n); | |
| 717 | return n; | |
| 718 | } | |
| 719 | EXPORT_SYMBOL(__copy_from_user_ll_nozero); | |
| 720 | ||
| c22ce143 HY |
721 | unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from, |
| 722 | unsigned long n) | |
| 723 | { | |
| c22ce143 | 724 | #ifdef CONFIG_X86_INTEL_USERCOPY |
| 3f50dbc1 PC |
725 | if (n > 64 && cpu_has_xmm2) |
| 726 | n = __copy_user_zeroing_intel_nocache(to, from, n); | |
| c22ce143 HY |
727 | else |
| 728 | __copy_user_zeroing(to, from, n); | |
| 729 | #else | |
| 3f50dbc1 | 730 | __copy_user_zeroing(to, from, n); |
| c22ce143 HY |
731 | #endif |
| 732 | return n; | |
| 733 | } | |
| 914c8269 | 734 | EXPORT_SYMBOL(__copy_from_user_ll_nocache); |
| c22ce143 | 735 | |
| 7c12d811 N |
736 | unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from, |
| 737 | unsigned long n) | |
| 738 | { | |
| 7c12d811 | 739 | #ifdef CONFIG_X86_INTEL_USERCOPY |
| 3f50dbc1 PC |
740 | if (n > 64 && cpu_has_xmm2) |
| 741 | n = __copy_user_intel_nocache(to, from, n); | |
| 7c12d811 N |
742 | else |
| 743 | __copy_user(to, from, n); | |
| 744 | #else | |
| 3f50dbc1 | 745 | __copy_user(to, from, n); |
| 7c12d811 N |
746 | #endif |
| 747 | return n; | |
| 748 | } | |
| 914c8269 | 749 | EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero); |
| 7c12d811 | 750 | |
| 1da177e4 LT |
751 | /** |
| 752 | * copy_to_user: - Copy a block of data into user space. | |
| 753 | * @to: Destination address, in user space. | |
| 754 | * @from: Source address, in kernel space. | |
| 755 | * @n: Number of bytes to copy. | |
| 756 | * | |
| 757 | * Context: User context only. This function may sleep. | |
| 758 | * | |
| 759 | * Copy data from kernel space to user space. | |
| 760 | * | |
| 761 | * Returns number of bytes that could not be copied. | |
| 762 | * On success, this will be zero. | |
| 763 | */ | |
| 764 | unsigned long | |
| 765 | copy_to_user(void __user *to, const void *from, unsigned long n) | |
| 766 | { | |
| 1da177e4 LT |
767 | if (access_ok(VERIFY_WRITE, to, n)) |
| 768 | n = __copy_to_user(to, from, n); | |
| 769 | return n; | |
| 770 | } | |
| 771 | EXPORT_SYMBOL(copy_to_user); | |
| 772 | ||
| 773 | /** | |
| 774 | * copy_from_user: - Copy a block of data from user space. | |
| 775 | * @to: Destination address, in kernel space. | |
| 776 | * @from: Source address, in user space. | |
| 777 | * @n: Number of bytes to copy. | |
| 778 | * | |
| 779 | * Context: User context only. This function may sleep. | |
| 780 | * | |
| 781 | * Copy data from user space to kernel space. | |
| 782 | * | |
| 783 | * Returns number of bytes that could not be copied. | |
| 784 | * On success, this will be zero. | |
| 785 | * | |
| 786 | * If some data could not be copied, this function will pad the copied | |
| 787 | * data to the requested size using zero bytes. | |
| 788 | */ | |
| 789 | unsigned long | |
| 9f0cf4ad | 790 | _copy_from_user(void *to, const void __user *from, unsigned long n) |
| 1da177e4 | 791 | { |
| 1da177e4 LT |
792 | if (access_ok(VERIFY_READ, from, n)) |
| 793 | n = __copy_from_user(to, from, n); | |
| 794 | else | |
| 795 | memset(to, 0, n); | |
| 796 | return n; | |
| 797 | } | |
| 9f0cf4ad | 798 | EXPORT_SYMBOL(_copy_from_user); |
| 4a312769 AV |
799 | |
| 800 | void copy_from_user_overflow(void) | |
| 801 | { | |
| 802 | WARN(1, "Buffer overflow detected!\n"); | |
| 803 | } | |
| 804 | EXPORT_SYMBOL(copy_from_user_overflow); |