projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 43697cb0 VG |
1 | /* |
| 2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * vineetg: June 2010 | |
| 9 | * -__clear_user( ) called multiple times during elf load was byte loop | |
| 10 | * converted to do as much word clear as possible. | |
| 11 | * | |
| 12 | * vineetg: Dec 2009 | |
| 13 | * -Hand crafted constant propagation for "constant" copy sizes | |
| 14 | * -stock kernel shrunk by 33K at -O3 | |
| 15 | * | |
| 16 | * vineetg: Sept 2009 | |
| 17 | * -Added option to (UN)inline copy_(to|from)_user to reduce code sz | |
| 18 | * -kernel shrunk by 200K even at -O3 (gcc 4.2.1) | |
| 19 | * -Enabled when doing -Os | |
| 20 | * | |
| 21 | * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 | |
| 22 | */ | |
| 23 | ||
| 24 | #ifndef _ASM_ARC_UACCESS_H | |
| 25 | #define _ASM_ARC_UACCESS_H | |
| 26 | ||
| 27 | #include <linux/sched.h> | |
| 28 | #include <asm/errno.h> | |
| 29 | #include <linux/string.h> /* for generic string functions */ | |
| 30 | ||
| 31 | ||
| 32 | #define __kernel_ok (segment_eq(get_fs(), KERNEL_DS)) | |
| 33 | ||
| 34 | /* | |
| 35 | * Algorthmically, for __user_ok() we want do: | |
| 36 | * (start < TASK_SIZE) && (start+len < TASK_SIZE) | |
| 37 | * where TASK_SIZE could either be retrieved from thread_info->addr_limit or | |
| 38 | * emitted directly in code. | |
| 39 | * | |
| 40 | * This can however be rewritten as follows: | |
| 41 | * (len <= TASK_SIZE) && (start+len < TASK_SIZE) | |
| 42 | * | |
| 43 | * Because it essentially checks if buffer end is within limit and @len is | |
| 44 | * non-ngeative, which implies that buffer start will be within limit too. | |
| 45 | * | |
| 46 | * The reason for rewriting being, for majorit yof cases, @len is generally | |
| 47 | * compile time constant, causing first sub-expression to be compile time | |
| 48 | * subsumed. | |
| 49 | * | |
| 50 | * The second part would generate weird large LIMMs e.g. (0x6000_0000 - 0x10), | |
| 51 | * so we check for TASK_SIZE using get_fs() since the addr_limit load from mem | |
| 52 | * would already have been done at this call site for __kernel_ok() | |
| 53 | * | |
| 54 | */ | |
| 55 | #define __user_ok(addr, sz) (((sz) <= TASK_SIZE) && \ | |
| 56 | (((addr)+(sz)) <= get_fs())) | |
| 57 | #define __access_ok(addr, sz) (unlikely(__kernel_ok) || \ | |
| 58 | likely(__user_ok((addr), (sz)))) | |
| 59 | ||
| 60 | static inline unsigned long | |
| 61 | __arc_copy_from_user(void *to, const void __user *from, unsigned long n) | |
| 62 | { | |
| 63 | long res = 0; | |
| 64 | char val; | |
| 65 | unsigned long tmp1, tmp2, tmp3, tmp4; | |
| 66 | unsigned long orig_n = n; | |
| 67 | ||
| 68 | if (n == 0) | |
| 69 | return 0; | |
| 70 | ||
| 71 | /* unaligned */ | |
| 72 | if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { | |
| 73 | ||
| 74 | unsigned char tmp; | |
| 75 | ||
| 76 | __asm__ __volatile__ ( | |
| 77 | " mov.f lp_count, %0 \n" | |
| 78 | " lpnz 2f \n" | |
| 79 | "1: ldb.ab %1, [%3, 1] \n" | |
| 80 | " stb.ab %1, [%2, 1] \n" | |
| 81 | " sub %0,%0,1 \n" | |
| 82 | "2: ;nop \n" | |
| 83 | " .section .fixup, \"ax\" \n" | |
| 84 | " .align 4 \n" | |
| 85 | "3: j 2b \n" | |
| 86 | " .previous \n" | |
| 87 | " .section __ex_table, \"a\" \n" | |
| 88 | " .align 4 \n" | |
| 89 | " .word 1b, 3b \n" | |
| 90 | " .previous \n" | |
| 91 | ||
| 92 | : "+r" (n), | |
| 93 | /* | |
| 94 | * Note as an '&' earlyclobber operand to make sure the | |
| 95 | * temporary register inside the loop is not the same as | |
| 96 | * FROM or TO. | |
| 97 | */ | |
| 98 | "=&r" (tmp), "+r" (to), "+r" (from) | |
| 99 | : | |
| 100 | : "lp_count", "lp_start", "lp_end", "memory"); | |
| 101 | ||
| 102 | return n; | |
| 103 | } | |
| 104 | ||
| 105 | /* | |
| 106 | * Hand-crafted constant propagation to reduce code sz of the | |
| 107 | * laddered copy 16x,8,4,2,1 | |
| 108 | */ | |
| 109 | if (__builtin_constant_p(orig_n)) { | |
| 110 | res = orig_n; | |
| 111 | ||
| 112 | if (orig_n / 16) { | |
| 113 | orig_n = orig_n % 16; | |
| 114 | ||
| 115 | __asm__ __volatile__( | |
| 116 | " lsr lp_count, %7,4 \n" | |
| 117 | " lp 3f \n" | |
| 118 | "1: ld.ab %3, [%2, 4] \n" | |
| 119 | "11: ld.ab %4, [%2, 4] \n" | |
| 120 | "12: ld.ab %5, [%2, 4] \n" | |
| 121 | "13: ld.ab %6, [%2, 4] \n" | |
| 122 | " st.ab %3, [%1, 4] \n" | |
| 123 | " st.ab %4, [%1, 4] \n" | |
| 124 | " st.ab %5, [%1, 4] \n" | |
| 125 | " st.ab %6, [%1, 4] \n" | |
| 126 | " sub %0,%0,16 \n" | |
| 127 | "3: ;nop \n" | |
| 128 | " .section .fixup, \"ax\" \n" | |
| 129 | " .align 4 \n" | |
| 130 | "4: j 3b \n" | |
| 131 | " .previous \n" | |
| 132 | " .section __ex_table, \"a\" \n" | |
| 133 | " .align 4 \n" | |
| 134 | " .word 1b, 4b \n" | |
| 135 | " .word 11b,4b \n" | |
| 136 | " .word 12b,4b \n" | |
| 137 | " .word 13b,4b \n" | |
| 138 | " .previous \n" | |
| 139 | : "+r" (res), "+r"(to), "+r"(from), | |
| 140 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 141 | : "ir"(n) | |
| 142 | : "lp_count", "memory"); | |
| 143 | } | |
| 144 | if (orig_n / 8) { | |
| 145 | orig_n = orig_n % 8; | |
| 146 | ||
| 147 | __asm__ __volatile__( | |
| 148 | "14: ld.ab %3, [%2,4] \n" | |
| 149 | "15: ld.ab %4, [%2,4] \n" | |
| 150 | " st.ab %3, [%1,4] \n" | |
| 151 | " st.ab %4, [%1,4] \n" | |
| 152 | " sub %0,%0,8 \n" | |
| 153 | "31: ;nop \n" | |
| 154 | " .section .fixup, \"ax\" \n" | |
| 155 | " .align 4 \n" | |
| 156 | "4: j 31b \n" | |
| 157 | " .previous \n" | |
| 158 | " .section __ex_table, \"a\" \n" | |
| 159 | " .align 4 \n" | |
| 160 | " .word 14b,4b \n" | |
| 161 | " .word 15b,4b \n" | |
| 162 | " .previous \n" | |
| 163 | : "+r" (res), "+r"(to), "+r"(from), | |
| 164 | "=r"(tmp1), "=r"(tmp2) | |
| 165 | : | |
| 166 | : "memory"); | |
| 167 | } | |
| 168 | if (orig_n / 4) { | |
| 169 | orig_n = orig_n % 4; | |
| 170 | ||
| 171 | __asm__ __volatile__( | |
| 172 | "16: ld.ab %3, [%2,4] \n" | |
| 173 | " st.ab %3, [%1,4] \n" | |
| 174 | " sub %0,%0,4 \n" | |
| 175 | "32: ;nop \n" | |
| 176 | " .section .fixup, \"ax\" \n" | |
| 177 | " .align 4 \n" | |
| 178 | "4: j 32b \n" | |
| 179 | " .previous \n" | |
| 180 | " .section __ex_table, \"a\" \n" | |
| 181 | " .align 4 \n" | |
| 182 | " .word 16b,4b \n" | |
| 183 | " .previous \n" | |
| 184 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 185 | : | |
| 186 | : "memory"); | |
| 187 | } | |
| 188 | if (orig_n / 2) { | |
| 189 | orig_n = orig_n % 2; | |
| 190 | ||
| 191 | __asm__ __volatile__( | |
| 192 | "17: ldw.ab %3, [%2,2] \n" | |
| 193 | " stw.ab %3, [%1,2] \n" | |
| 194 | " sub %0,%0,2 \n" | |
| 195 | "33: ;nop \n" | |
| 196 | " .section .fixup, \"ax\" \n" | |
| 197 | " .align 4 \n" | |
| 198 | "4: j 33b \n" | |
| 199 | " .previous \n" | |
| 200 | " .section __ex_table, \"a\" \n" | |
| 201 | " .align 4 \n" | |
| 202 | " .word 17b,4b \n" | |
| 203 | " .previous \n" | |
| 204 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 205 | : | |
| 206 | : "memory"); | |
| 207 | } | |
| 208 | if (orig_n & 1) { | |
| 209 | __asm__ __volatile__( | |
| 210 | "18: ldb.ab %3, [%2,2] \n" | |
| 211 | " stb.ab %3, [%1,2] \n" | |
| 212 | " sub %0,%0,1 \n" | |
| 213 | "34: ; nop \n" | |
| 214 | " .section .fixup, \"ax\" \n" | |
| 215 | " .align 4 \n" | |
| 216 | "4: j 34b \n" | |
| 217 | " .previous \n" | |
| 218 | " .section __ex_table, \"a\" \n" | |
| 219 | " .align 4 \n" | |
| 220 | " .word 18b,4b \n" | |
| 221 | " .previous \n" | |
| 222 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 223 | : | |
| 224 | : "memory"); | |
| 225 | } | |
| 226 | } else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */ | |
| 227 | ||
| 228 | __asm__ __volatile__( | |
| 229 | " mov %0,%3 \n" | |
| 230 | " lsr.f lp_count, %3,4 \n" /* 16x bytes */ | |
| 231 | " lpnz 3f \n" | |
| 232 | "1: ld.ab %5, [%2, 4] \n" | |
| 233 | "11: ld.ab %6, [%2, 4] \n" | |
| 234 | "12: ld.ab %7, [%2, 4] \n" | |
| 235 | "13: ld.ab %8, [%2, 4] \n" | |
| 236 | " st.ab %5, [%1, 4] \n" | |
| 237 | " st.ab %6, [%1, 4] \n" | |
| 238 | " st.ab %7, [%1, 4] \n" | |
| 239 | " st.ab %8, [%1, 4] \n" | |
| 240 | " sub %0,%0,16 \n" | |
| 241 | "3: and.f %3,%3,0xf \n" /* stragglers */ | |
| 242 | " bz 34f \n" | |
| 243 | " bbit0 %3,3,31f \n" /* 8 bytes left */ | |
| 244 | "14: ld.ab %5, [%2,4] \n" | |
| 245 | "15: ld.ab %6, [%2,4] \n" | |
| 246 | " st.ab %5, [%1,4] \n" | |
| 247 | " st.ab %6, [%1,4] \n" | |
| 248 | " sub.f %0,%0,8 \n" | |
| 249 | "31: bbit0 %3,2,32f \n" /* 4 bytes left */ | |
| 250 | "16: ld.ab %5, [%2,4] \n" | |
| 251 | " st.ab %5, [%1,4] \n" | |
| 252 | " sub.f %0,%0,4 \n" | |
| 253 | "32: bbit0 %3,1,33f \n" /* 2 bytes left */ | |
| 254 | "17: ldw.ab %5, [%2,2] \n" | |
| 255 | " stw.ab %5, [%1,2] \n" | |
| 256 | " sub.f %0,%0,2 \n" | |
| 257 | "33: bbit0 %3,0,34f \n" | |
| 258 | "18: ldb.ab %5, [%2,1] \n" /* 1 byte left */ | |
| 259 | " stb.ab %5, [%1,1] \n" | |
| 260 | " sub.f %0,%0,1 \n" | |
| 261 | "34: ;nop \n" | |
| 262 | " .section .fixup, \"ax\" \n" | |
| 263 | " .align 4 \n" | |
| 264 | "4: j 34b \n" | |
| 265 | " .previous \n" | |
| 266 | " .section __ex_table, \"a\" \n" | |
| 267 | " .align 4 \n" | |
| 268 | " .word 1b, 4b \n" | |
| 269 | " .word 11b,4b \n" | |
| 270 | " .word 12b,4b \n" | |
| 271 | " .word 13b,4b \n" | |
| 272 | " .word 14b,4b \n" | |
| 273 | " .word 15b,4b \n" | |
| 274 | " .word 16b,4b \n" | |
| 275 | " .word 17b,4b \n" | |
| 276 | " .word 18b,4b \n" | |
| 277 | " .previous \n" | |
| 278 | : "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val), | |
| 279 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 280 | : | |
| 281 | : "lp_count", "memory"); | |
| 282 | } | |
| 283 | ||
| 284 | return res; | |
| 285 | } | |
| 286 | ||
| 287 | extern unsigned long slowpath_copy_to_user(void __user *to, const void *from, | |
| 288 | unsigned long n); | |
| 289 | ||
| 290 | static inline unsigned long | |
| 291 | __arc_copy_to_user(void __user *to, const void *from, unsigned long n) | |
| 292 | { | |
| 293 | long res = 0; | |
| 294 | char val; | |
| 295 | unsigned long tmp1, tmp2, tmp3, tmp4; | |
| 296 | unsigned long orig_n = n; | |
| 297 | ||
| 298 | if (n == 0) | |
| 299 | return 0; | |
| 300 | ||
| 301 | /* unaligned */ | |
| 302 | if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { | |
| 303 | ||
| 304 | unsigned char tmp; | |
| 305 | ||
| 306 | __asm__ __volatile__( | |
| 307 | " mov.f lp_count, %0 \n" | |
| 308 | " lpnz 3f \n" | |
| 309 | " ldb.ab %1, [%3, 1] \n" | |
| 310 | "1: stb.ab %1, [%2, 1] \n" | |
| 311 | " sub %0, %0, 1 \n" | |
| 312 | "3: ;nop \n" | |
| 313 | " .section .fixup, \"ax\" \n" | |
| 314 | " .align 4 \n" | |
| 315 | "4: j 3b \n" | |
| 316 | " .previous \n" | |
| 317 | " .section __ex_table, \"a\" \n" | |
| 318 | " .align 4 \n" | |
| 319 | " .word 1b, 4b \n" | |
| 320 | " .previous \n" | |
| 321 | ||
| 322 | : "+r" (n), | |
| 323 | /* Note as an '&' earlyclobber operand to make sure the | |
| 324 | * temporary register inside the loop is not the same as | |
| 325 | * FROM or TO. | |
| 326 | */ | |
| 327 | "=&r" (tmp), "+r" (to), "+r" (from) | |
| 328 | : | |
| 329 | : "lp_count", "lp_start", "lp_end", "memory"); | |
| 330 | ||
| 331 | return n; | |
| 332 | } | |
| 333 | ||
| 334 | if (__builtin_constant_p(orig_n)) { | |
| 335 | res = orig_n; | |
| 336 | ||
| 337 | if (orig_n / 16) { | |
| 338 | orig_n = orig_n % 16; | |
| 339 | ||
| 340 | __asm__ __volatile__( | |
| 341 | " lsr lp_count, %7,4 \n" | |
| 342 | " lp 3f \n" | |
| 343 | " ld.ab %3, [%2, 4] \n" | |
| 344 | " ld.ab %4, [%2, 4] \n" | |
| 345 | " ld.ab %5, [%2, 4] \n" | |
| 346 | " ld.ab %6, [%2, 4] \n" | |
| 347 | "1: st.ab %3, [%1, 4] \n" | |
| 348 | "11: st.ab %4, [%1, 4] \n" | |
| 349 | "12: st.ab %5, [%1, 4] \n" | |
| 350 | "13: st.ab %6, [%1, 4] \n" | |
| 351 | " sub %0, %0, 16 \n" | |
| 352 | "3:;nop \n" | |
| 353 | " .section .fixup, \"ax\" \n" | |
| 354 | " .align 4 \n" | |
| 355 | "4: j 3b \n" | |
| 356 | " .previous \n" | |
| 357 | " .section __ex_table, \"a\" \n" | |
| 358 | " .align 4 \n" | |
| 359 | " .word 1b, 4b \n" | |
| 360 | " .word 11b,4b \n" | |
| 361 | " .word 12b,4b \n" | |
| 362 | " .word 13b,4b \n" | |
| 363 | " .previous \n" | |
| 364 | : "+r" (res), "+r"(to), "+r"(from), | |
| 365 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 366 | : "ir"(n) | |
| 367 | : "lp_count", "memory"); | |
| 368 | } | |
| 369 | if (orig_n / 8) { | |
| 370 | orig_n = orig_n % 8; | |
| 371 | ||
| 372 | __asm__ __volatile__( | |
| 373 | " ld.ab %3, [%2,4] \n" | |
| 374 | " ld.ab %4, [%2,4] \n" | |
| 375 | "14: st.ab %3, [%1,4] \n" | |
| 376 | "15: st.ab %4, [%1,4] \n" | |
| 377 | " sub %0, %0, 8 \n" | |
| 378 | "31:;nop \n" | |
| 379 | " .section .fixup, \"ax\" \n" | |
| 380 | " .align 4 \n" | |
| 381 | "4: j 31b \n" | |
| 382 | " .previous \n" | |
| 383 | " .section __ex_table, \"a\" \n" | |
| 384 | " .align 4 \n" | |
| 385 | " .word 14b,4b \n" | |
| 386 | " .word 15b,4b \n" | |
| 387 | " .previous \n" | |
| 388 | : "+r" (res), "+r"(to), "+r"(from), | |
| 389 | "=r"(tmp1), "=r"(tmp2) | |
| 390 | : | |
| 391 | : "memory"); | |
| 392 | } | |
| 393 | if (orig_n / 4) { | |
| 394 | orig_n = orig_n % 4; | |
| 395 | ||
| 396 | __asm__ __volatile__( | |
| 397 | " ld.ab %3, [%2,4] \n" | |
| 398 | "16: st.ab %3, [%1,4] \n" | |
| 399 | " sub %0, %0, 4 \n" | |
| 400 | "32:;nop \n" | |
| 401 | " .section .fixup, \"ax\" \n" | |
| 402 | " .align 4 \n" | |
| 403 | "4: j 32b \n" | |
| 404 | " .previous \n" | |
| 405 | " .section __ex_table, \"a\" \n" | |
| 406 | " .align 4 \n" | |
| 407 | " .word 16b,4b \n" | |
| 408 | " .previous \n" | |
| 409 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 410 | : | |
| 411 | : "memory"); | |
| 412 | } | |
| 413 | if (orig_n / 2) { | |
| 414 | orig_n = orig_n % 2; | |
| 415 | ||
| 416 | __asm__ __volatile__( | |
| 417 | " ldw.ab %3, [%2,2] \n" | |
| 418 | "17: stw.ab %3, [%1,2] \n" | |
| 419 | " sub %0, %0, 2 \n" | |
| 420 | "33:;nop \n" | |
| 421 | " .section .fixup, \"ax\" \n" | |
| 422 | " .align 4 \n" | |
| 423 | "4: j 33b \n" | |
| 424 | " .previous \n" | |
| 425 | " .section __ex_table, \"a\" \n" | |
| 426 | " .align 4 \n" | |
| 427 | " .word 17b,4b \n" | |
| 428 | " .previous \n" | |
| 429 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 430 | : | |
| 431 | : "memory"); | |
| 432 | } | |
| 433 | if (orig_n & 1) { | |
| 434 | __asm__ __volatile__( | |
| 435 | " ldb.ab %3, [%2,1] \n" | |
| 436 | "18: stb.ab %3, [%1,1] \n" | |
| 437 | " sub %0, %0, 1 \n" | |
| 438 | "34: ;nop \n" | |
| 439 | " .section .fixup, \"ax\" \n" | |
| 440 | " .align 4 \n" | |
| 441 | "4: j 34b \n" | |
| 442 | " .previous \n" | |
| 443 | " .section __ex_table, \"a\" \n" | |
| 444 | " .align 4 \n" | |
| 445 | " .word 18b,4b \n" | |
| 446 | " .previous \n" | |
| 447 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 448 | : | |
| 449 | : "memory"); | |
| 450 | } | |
| 451 | } else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */ | |
| 452 | ||
| 453 | __asm__ __volatile__( | |
| 454 | " mov %0,%3 \n" | |
| 455 | " lsr.f lp_count, %3,4 \n" /* 16x bytes */ | |
| 456 | " lpnz 3f \n" | |
| 457 | " ld.ab %5, [%2, 4] \n" | |
| 458 | " ld.ab %6, [%2, 4] \n" | |
| 459 | " ld.ab %7, [%2, 4] \n" | |
| 460 | " ld.ab %8, [%2, 4] \n" | |
| 461 | "1: st.ab %5, [%1, 4] \n" | |
| 462 | "11: st.ab %6, [%1, 4] \n" | |
| 463 | "12: st.ab %7, [%1, 4] \n" | |
| 464 | "13: st.ab %8, [%1, 4] \n" | |
| 465 | " sub %0, %0, 16 \n" | |
| 466 | "3: and.f %3,%3,0xf \n" /* stragglers */ | |
| 467 | " bz 34f \n" | |
| 468 | " bbit0 %3,3,31f \n" /* 8 bytes left */ | |
| 469 | " ld.ab %5, [%2,4] \n" | |
| 470 | " ld.ab %6, [%2,4] \n" | |
| 471 | "14: st.ab %5, [%1,4] \n" | |
| 472 | "15: st.ab %6, [%1,4] \n" | |
| 473 | " sub.f %0, %0, 8 \n" | |
| 474 | "31: bbit0 %3,2,32f \n" /* 4 bytes left */ | |
| 475 | " ld.ab %5, [%2,4] \n" | |
| 476 | "16: st.ab %5, [%1,4] \n" | |
| 477 | " sub.f %0, %0, 4 \n" | |
| 478 | "32: bbit0 %3,1,33f \n" /* 2 bytes left */ | |
| 479 | " ldw.ab %5, [%2,2] \n" | |
| 480 | "17: stw.ab %5, [%1,2] \n" | |
| 481 | " sub.f %0, %0, 2 \n" | |
| 482 | "33: bbit0 %3,0,34f \n" | |
| 483 | " ldb.ab %5, [%2,1] \n" /* 1 byte left */ | |
| 484 | "18: stb.ab %5, [%1,1] \n" | |
| 485 | " sub.f %0, %0, 1 \n" | |
| 486 | "34: ;nop \n" | |
| 487 | " .section .fixup, \"ax\" \n" | |
| 488 | " .align 4 \n" | |
| 489 | "4: j 34b \n" | |
| 490 | " .previous \n" | |
| 491 | " .section __ex_table, \"a\" \n" | |
| 492 | " .align 4 \n" | |
| 493 | " .word 1b, 4b \n" | |
| 494 | " .word 11b,4b \n" | |
| 495 | " .word 12b,4b \n" | |
| 496 | " .word 13b,4b \n" | |
| 497 | " .word 14b,4b \n" | |
| 498 | " .word 15b,4b \n" | |
| 499 | " .word 16b,4b \n" | |
| 500 | " .word 17b,4b \n" | |
| 501 | " .word 18b,4b \n" | |
| 502 | " .previous \n" | |
| 503 | : "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val), | |
| 504 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 505 | : | |
| 506 | : "lp_count", "memory"); | |
| 507 | } | |
| 508 | ||
| 509 | return res; | |
| 510 | } | |
| 511 | ||
| 512 | static inline unsigned long __arc_clear_user(void __user *to, unsigned long n) | |
| 513 | { | |
| 514 | long res = n; | |
| 515 | unsigned char *d_char = to; | |
| 516 | ||
| 517 | __asm__ __volatile__( | |
| 518 | " bbit0 %0, 0, 1f \n" | |
| 519 | "75: stb.ab %2, [%0,1] \n" | |
| 520 | " sub %1, %1, 1 \n" | |
| 521 | "1: bbit0 %0, 1, 2f \n" | |
| 522 | "76: stw.ab %2, [%0,2] \n" | |
| 523 | " sub %1, %1, 2 \n" | |
| 524 | "2: asr.f lp_count, %1, 2 \n" | |
| 525 | " lpnz 3f \n" | |
| 526 | "77: st.ab %2, [%0,4] \n" | |
| 527 | " sub %1, %1, 4 \n" | |
| 528 | "3: bbit0 %1, 1, 4f \n" | |
| 529 | "78: stw.ab %2, [%0,2] \n" | |
| 530 | " sub %1, %1, 2 \n" | |
| 531 | "4: bbit0 %1, 0, 5f \n" | |
| 532 | "79: stb.ab %2, [%0,1] \n" | |
| 533 | " sub %1, %1, 1 \n" | |
| 534 | "5: \n" | |
| 535 | " .section .fixup, \"ax\" \n" | |
| 536 | " .align 4 \n" | |
| 537 | "3: j 5b \n" | |
| 538 | " .previous \n" | |
| 539 | " .section __ex_table, \"a\" \n" | |
| 540 | " .align 4 \n" | |
| 541 | " .word 75b, 3b \n" | |
| 542 | " .word 76b, 3b \n" | |
| 543 | " .word 77b, 3b \n" | |
| 544 | " .word 78b, 3b \n" | |
| 545 | " .word 79b, 3b \n" | |
| 546 | " .previous \n" | |
| 547 | : "+r"(d_char), "+r"(res) | |
| 548 | : "i"(0) | |
| 549 | : "lp_count", "lp_start", "lp_end", "memory"); | |
| 550 | ||
| 551 | return res; | |
| 552 | } | |
| 553 | ||
| 554 | static inline long | |
| 555 | __arc_strncpy_from_user(char *dst, const char __user *src, long count) | |
| 556 | { | |
| 557 | long res = count; | |
| 558 | char val; | |
| 559 | unsigned int hw_count; | |
| 560 | ||
| 561 | if (count == 0) | |
| 562 | return 0; | |
| 563 | ||
| 564 | __asm__ __volatile__( | |
| 565 | " lp 2f \n" | |
| 566 | "1: ldb.ab %3, [%2, 1] \n" | |
| 567 | " breq.d %3, 0, 2f \n" | |
| 568 | " stb.ab %3, [%1, 1] \n" | |
| 569 | "2: sub %0, %6, %4 \n" | |
| 570 | "3: ;nop \n" | |
| 571 | " .section .fixup, \"ax\" \n" | |
| 572 | " .align 4 \n" | |
| 573 | "4: mov %0, %5 \n" | |
| 574 | " j 3b \n" | |
| 575 | " .previous \n" | |
| 576 | " .section __ex_table, \"a\" \n" | |
| 577 | " .align 4 \n" | |
| 578 | " .word 1b, 4b \n" | |
| 579 | " .previous \n" | |
| 580 | : "=r"(res), "+r"(dst), "+r"(src), "=&r"(val), "=l"(hw_count) | |
| 581 | : "g"(-EFAULT), "ir"(count), "4"(count) /* this "4" seeds lp_count */ | |
| 582 | : "memory"); | |
| 583 | ||
| 584 | return res; | |
| 585 | } | |
| 586 | ||
| 587 | static inline long __arc_strnlen_user(const char __user *s, long n) | |
| 588 | { | |
| 589 | long res, tmp1, cnt; | |
| 590 | char val; | |
| 591 | ||
| 592 | __asm__ __volatile__( | |
| 593 | " mov %2, %1 \n" | |
| 594 | "1: ldb.ab %3, [%0, 1] \n" | |
| 595 | " breq.d %3, 0, 2f \n" | |
| 596 | " sub.f %2, %2, 1 \n" | |
| 597 | " bnz 1b \n" | |
| 598 | " sub %2, %2, 1 \n" | |
| 599 | "2: sub %0, %1, %2 \n" | |
| 600 | "3: ;nop \n" | |
| 601 | " .section .fixup, \"ax\" \n" | |
| 602 | " .align 4 \n" | |
| 603 | "4: mov %0, 0 \n" | |
| 604 | " j 3b \n" | |
| 605 | " .previous \n" | |
| 606 | " .section __ex_table, \"a\" \n" | |
| 607 | " .align 4 \n" | |
| 608 | " .word 1b, 4b \n" | |
| 609 | " .previous \n" | |
| 610 | : "=r"(res), "=r"(tmp1), "=r"(cnt), "=r"(val) | |
| 611 | : "0"(s), "1"(n) | |
| 612 | : "memory"); | |
| 613 | ||
| 614 | return res; | |
| 615 | } | |
| 616 | ||
| 617 | #ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE | |
| 618 | #define __copy_from_user(t, f, n) __arc_copy_from_user(t, f, n) | |
| 619 | #define __copy_to_user(t, f, n) __arc_copy_to_user(t, f, n) | |
| 620 | #define __clear_user(d, n) __arc_clear_user(d, n) | |
| 621 | #define __strncpy_from_user(d, s, n) __arc_strncpy_from_user(d, s, n) | |
| 622 | #define __strnlen_user(s, n) __arc_strnlen_user(s, n) | |
| 623 | #else | |
| 624 | extern long arc_copy_from_user_noinline(void *to, const void __user * from, | |
| 625 | unsigned long n); | |
| 626 | extern long arc_copy_to_user_noinline(void __user *to, const void *from, | |
| 627 | unsigned long n); | |
| 628 | extern unsigned long arc_clear_user_noinline(void __user *to, | |
| 629 | unsigned long n); | |
| 630 | extern long arc_strncpy_from_user_noinline (char *dst, const char __user *src, | |
| 631 | long count); | |
| 632 | extern long arc_strnlen_user_noinline(const char __user *src, long n); | |
| 633 | ||
| 634 | #define __copy_from_user(t, f, n) arc_copy_from_user_noinline(t, f, n) | |
| 635 | #define __copy_to_user(t, f, n) arc_copy_to_user_noinline(t, f, n) | |
| 636 | #define __clear_user(d, n) arc_clear_user_noinline(d, n) | |
| 637 | #define __strncpy_from_user(d, s, n) arc_strncpy_from_user_noinline(d, s, n) | |
| 638 | #define __strnlen_user(s, n) arc_strnlen_user_noinline(s, n) | |
| 639 | ||
| 640 | #endif | |
| 641 | ||
| 642 | #include <asm-generic/uaccess.h> | |
| 643 | ||
| 644 | extern int fixup_exception(struct pt_regs *regs); | |
| 645 | ||
| 646 | #endif |