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/string.h> /* for generic string functions */ 28 29 30 #define __kernel_ok (uaccess_kernel()) 31 32 /* 33 * Algorithmically, for __user_ok() we want do: 34 * (start < TASK_SIZE) && (start+len < TASK_SIZE) 35 * where TASK_SIZE could either be retrieved from thread_info->addr_limit or 36 * emitted directly in code. 37 * 38 * This can however be rewritten as follows: 39 * (len <= TASK_SIZE) && (start+len < TASK_SIZE) 40 * 41 * Because it essentially checks if buffer end is within limit and @len is 42 * non-ngeative, which implies that buffer start will be within limit too. 43 * 44 * The reason for rewriting being, for majority of cases, @len is generally 45 * compile time constant, causing first sub-expression to be compile time 46 * subsumed. 47 * 48 * The second part would generate weird large LIMMs e.g. (0x6000_0000 - 0x10), 49 * so we check for TASK_SIZE using get_fs() since the addr_limit load from mem 50 * would already have been done at this call site for __kernel_ok() 51 * 52 */ 53 #define __user_ok(addr, sz) (((sz) <= TASK_SIZE) && \ 54 ((addr) <= (get_fs() - (sz)))) 55 #define __access_ok(addr, sz) (unlikely(__kernel_ok) || \ 56 likely(__user_ok((addr), (sz)))) 57 58 /*********** Single byte/hword/word copies ******************/ 59 60 #define __get_user_fn(sz, u, k) \ 61 ({ \ 62 long __ret = 0; /* success by default */ \ 63 switch (sz) { \ 64 case 1: __arc_get_user_one(*(k), u, "ldb", __ret); break; \ 65 case 2: __arc_get_user_one(*(k), u, "ldw", __ret); break; \ 66 case 4: __arc_get_user_one(*(k), u, "ld", __ret); break; \ 67 case 8: __arc_get_user_one_64(*(k), u, __ret); break; \ 68 } \ 69 __ret; \ 70 }) 71 72 /* 73 * Returns 0 on success, -EFAULT if not. 74 * @ret already contains 0 - given that errors will be less likely 75 * (hence +r asm constraint below). 76 * In case of error, fixup code will make it -EFAULT 77 */ 78 #define __arc_get_user_one(dst, src, op, ret) \ 79 __asm__ __volatile__( \ 80 "1: "op" %1,[%2]\n" \ 81 "2: ;nop\n" \ 82 " .section .fixup, \"ax\"\n" \ 83 " .align 4\n" \ 84 "3: # return -EFAULT\n" \ 85 " mov %0, %3\n" \ 86 " # zero out dst ptr\n" \ 87 " mov %1, 0\n" \ 88 " j 2b\n" \ 89 " .previous\n" \ 90 " .section __ex_table, \"a\"\n" \ 91 " .align 4\n" \ 92 " .word 1b,3b\n" \ 93 " .previous\n" \ 94 \ 95 : "+r" (ret), "=r" (dst) \ 96 : "r" (src), "ir" (-EFAULT)) 97 98 #define __arc_get_user_one_64(dst, src, ret) \ 99 __asm__ __volatile__( \ 100 "1: ld %1,[%2]\n" \ 101 "4: ld %R1,[%2, 4]\n" \ 102 "2: ;nop\n" \ 103 " .section .fixup, \"ax\"\n" \ 104 " .align 4\n" \ 105 "3: # return -EFAULT\n" \ 106 " mov %0, %3\n" \ 107 " # zero out dst ptr\n" \ 108 " mov %1, 0\n" \ 109 " mov %R1, 0\n" \ 110 " j 2b\n" \ 111 " .previous\n" \ 112 " .section __ex_table, \"a\"\n" \ 113 " .align 4\n" \ 114 " .word 1b,3b\n" \ 115 " .word 4b,3b\n" \ 116 " .previous\n" \ 117 \ 118 : "+r" (ret), "=r" (dst) \ 119 : "r" (src), "ir" (-EFAULT)) 120 121 #define __put_user_fn(sz, u, k) \ 122 ({ \ 123 long __ret = 0; /* success by default */ \ 124 switch (sz) { \ 125 case 1: __arc_put_user_one(*(k), u, "stb", __ret); break; \ 126 case 2: __arc_put_user_one(*(k), u, "stw", __ret); break; \ 127 case 4: __arc_put_user_one(*(k), u, "st", __ret); break; \ 128 case 8: __arc_put_user_one_64(*(k), u, __ret); break; \ 129 } \ 130 __ret; \ 131 }) 132 133 #define __arc_put_user_one(src, dst, op, ret) \ 134 __asm__ __volatile__( \ 135 "1: "op" %1,[%2]\n" \ 136 "2: ;nop\n" \ 137 " .section .fixup, \"ax\"\n" \ 138 " .align 4\n" \ 139 "3: mov %0, %3\n" \ 140 " j 2b\n" \ 141 " .previous\n" \ 142 " .section __ex_table, \"a\"\n" \ 143 " .align 4\n" \ 144 " .word 1b,3b\n" \ 145 " .previous\n" \ 146 \ 147 : "+r" (ret) \ 148 : "r" (src), "r" (dst), "ir" (-EFAULT)) 149 150 #define __arc_put_user_one_64(src, dst, ret) \ 151 __asm__ __volatile__( \ 152 "1: st %1,[%2]\n" \ 153 "4: st %R1,[%2, 4]\n" \ 154 "2: ;nop\n" \ 155 " .section .fixup, \"ax\"\n" \ 156 " .align 4\n" \ 157 "3: mov %0, %3\n" \ 158 " j 2b\n" \ 159 " .previous\n" \ 160 " .section __ex_table, \"a\"\n" \ 161 " .align 4\n" \ 162 " .word 1b,3b\n" \ 163 " .word 4b,3b\n" \ 164 " .previous\n" \ 165 \ 166 : "+r" (ret) \ 167 : "r" (src), "r" (dst), "ir" (-EFAULT)) 168 169 170 static inline unsigned long 171 raw_copy_from_user(void *to, const void __user *from, unsigned long n) 172 { 173 long res = 0; 174 char val; 175 unsigned long tmp1, tmp2, tmp3, tmp4; 176 unsigned long orig_n = n; 177 178 if (n == 0) 179 return 0; 180 181 /* unaligned */ 182 if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { 183 184 unsigned char tmp; 185 186 __asm__ __volatile__ ( 187 " mov.f lp_count, %0 \n" 188 " lpnz 2f \n" 189 "1: ldb.ab %1, [%3, 1] \n" 190 " stb.ab %1, [%2, 1] \n" 191 " sub %0,%0,1 \n" 192 "2: ;nop \n" 193 " .section .fixup, \"ax\" \n" 194 " .align 4 \n" 195 "3: j 2b \n" 196 " .previous \n" 197 " .section __ex_table, \"a\" \n" 198 " .align 4 \n" 199 " .word 1b, 3b \n" 200 " .previous \n" 201 202 : "+r" (n), 203 /* 204 * Note as an '&' earlyclobber operand to make sure the 205 * temporary register inside the loop is not the same as 206 * FROM or TO. 207 */ 208 "=&r" (tmp), "+r" (to), "+r" (from) 209 : 210 : "lp_count", "lp_start", "lp_end", "memory"); 211 212 return n; 213 } 214 215 /* 216 * Hand-crafted constant propagation to reduce code sz of the 217 * laddered copy 16x,8,4,2,1 218 */ 219 if (__builtin_constant_p(orig_n)) { 220 res = orig_n; 221 222 if (orig_n / 16) { 223 orig_n = orig_n % 16; 224 225 __asm__ __volatile__( 226 " lsr lp_count, %7,4 \n" 227 " lp 3f \n" 228 "1: ld.ab %3, [%2, 4] \n" 229 "11: ld.ab %4, [%2, 4] \n" 230 "12: ld.ab %5, [%2, 4] \n" 231 "13: ld.ab %6, [%2, 4] \n" 232 " st.ab %3, [%1, 4] \n" 233 " st.ab %4, [%1, 4] \n" 234 " st.ab %5, [%1, 4] \n" 235 " st.ab %6, [%1, 4] \n" 236 " sub %0,%0,16 \n" 237 "3: ;nop \n" 238 " .section .fixup, \"ax\" \n" 239 " .align 4 \n" 240 "4: j 3b \n" 241 " .previous \n" 242 " .section __ex_table, \"a\" \n" 243 " .align 4 \n" 244 " .word 1b, 4b \n" 245 " .word 11b,4b \n" 246 " .word 12b,4b \n" 247 " .word 13b,4b \n" 248 " .previous \n" 249 : "+r" (res), "+r"(to), "+r"(from), 250 "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) 251 : "ir"(n) 252 : "lp_count", "memory"); 253 } 254 if (orig_n / 8) { 255 orig_n = orig_n % 8; 256 257 __asm__ __volatile__( 258 "14: ld.ab %3, [%2,4] \n" 259 "15: ld.ab %4, [%2,4] \n" 260 " st.ab %3, [%1,4] \n" 261 " st.ab %4, [%1,4] \n" 262 " sub %0,%0,8 \n" 263 "31: ;nop \n" 264 " .section .fixup, \"ax\" \n" 265 " .align 4 \n" 266 "4: j 31b \n" 267 " .previous \n" 268 " .section __ex_table, \"a\" \n" 269 " .align 4 \n" 270 " .word 14b,4b \n" 271 " .word 15b,4b \n" 272 " .previous \n" 273 : "+r" (res), "+r"(to), "+r"(from), 274 "=r"(tmp1), "=r"(tmp2) 275 : 276 : "memory"); 277 } 278 if (orig_n / 4) { 279 orig_n = orig_n % 4; 280 281 __asm__ __volatile__( 282 "16: ld.ab %3, [%2,4] \n" 283 " st.ab %3, [%1,4] \n" 284 " sub %0,%0,4 \n" 285 "32: ;nop \n" 286 " .section .fixup, \"ax\" \n" 287 " .align 4 \n" 288 "4: j 32b \n" 289 " .previous \n" 290 " .section __ex_table, \"a\" \n" 291 " .align 4 \n" 292 " .word 16b,4b \n" 293 " .previous \n" 294 : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) 295 : 296 : "memory"); 297 } 298 if (orig_n / 2) { 299 orig_n = orig_n % 2; 300 301 __asm__ __volatile__( 302 "17: ldw.ab %3, [%2,2] \n" 303 " stw.ab %3, [%1,2] \n" 304 " sub %0,%0,2 \n" 305 "33: ;nop \n" 306 " .section .fixup, \"ax\" \n" 307 " .align 4 \n" 308 "4: j 33b \n" 309 " .previous \n" 310 " .section __ex_table, \"a\" \n" 311 " .align 4 \n" 312 " .word 17b,4b \n" 313 " .previous \n" 314 : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) 315 : 316 : "memory"); 317 } 318 if (orig_n & 1) { 319 __asm__ __volatile__( 320 "18: ldb.ab %3, [%2,2] \n" 321 " stb.ab %3, [%1,2] \n" 322 " sub %0,%0,1 \n" 323 "34: ; nop \n" 324 " .section .fixup, \"ax\" \n" 325 " .align 4 \n" 326 "4: j 34b \n" 327 " .previous \n" 328 " .section __ex_table, \"a\" \n" 329 " .align 4 \n" 330 " .word 18b,4b \n" 331 " .previous \n" 332 : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) 333 : 334 : "memory"); 335 } 336 } else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */ 337 338 __asm__ __volatile__( 339 " mov %0,%3 \n" 340 " lsr.f lp_count, %3,4 \n" /* 16x bytes */ 341 " lpnz 3f \n" 342 "1: ld.ab %5, [%2, 4] \n" 343 "11: ld.ab %6, [%2, 4] \n" 344 "12: ld.ab %7, [%2, 4] \n" 345 "13: ld.ab %8, [%2, 4] \n" 346 " st.ab %5, [%1, 4] \n" 347 " st.ab %6, [%1, 4] \n" 348 " st.ab %7, [%1, 4] \n" 349 " st.ab %8, [%1, 4] \n" 350 " sub %0,%0,16 \n" 351 "3: and.f %3,%3,0xf \n" /* stragglers */ 352 " bz 34f \n" 353 " bbit0 %3,3,31f \n" /* 8 bytes left */ 354 "14: ld.ab %5, [%2,4] \n" 355 "15: ld.ab %6, [%2,4] \n" 356 " st.ab %5, [%1,4] \n" 357 " st.ab %6, [%1,4] \n" 358 " sub.f %0,%0,8 \n" 359 "31: bbit0 %3,2,32f \n" /* 4 bytes left */ 360 "16: ld.ab %5, [%2,4] \n" 361 " st.ab %5, [%1,4] \n" 362 " sub.f %0,%0,4 \n" 363 "32: bbit0 %3,1,33f \n" /* 2 bytes left */ 364 "17: ldw.ab %5, [%2,2] \n" 365 " stw.ab %5, [%1,2] \n" 366 " sub.f %0,%0,2 \n" 367 "33: bbit0 %3,0,34f \n" 368 "18: ldb.ab %5, [%2,1] \n" /* 1 byte left */ 369 " stb.ab %5, [%1,1] \n" 370 " sub.f %0,%0,1 \n" 371 "34: ;nop \n" 372 " .section .fixup, \"ax\" \n" 373 " .align 4 \n" 374 "4: j 34b \n" 375 " .previous \n" 376 " .section __ex_table, \"a\" \n" 377 " .align 4 \n" 378 " .word 1b, 4b \n" 379 " .word 11b,4b \n" 380 " .word 12b,4b \n" 381 " .word 13b,4b \n" 382 " .word 14b,4b \n" 383 " .word 15b,4b \n" 384 " .word 16b,4b \n" 385 " .word 17b,4b \n" 386 " .word 18b,4b \n" 387 " .previous \n" 388 : "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val), 389 "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) 390 : 391 : "lp_count", "memory"); 392 } 393 394 return res; 395 } 396 397 static inline unsigned long 398 raw_copy_to_user(void __user *to, const void *from, unsigned long n) 399 { 400 long res = 0; 401 char val; 402 unsigned long tmp1, tmp2, tmp3, tmp4; 403 unsigned long orig_n = n; 404 405 if (n == 0) 406 return 0; 407 408 /* unaligned */ 409 if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { 410 411 unsigned char tmp; 412 413 __asm__ __volatile__( 414 " mov.f lp_count, %0 \n" 415 " lpnz 3f \n" 416 " ldb.ab %1, [%3, 1] \n" 417 "1: stb.ab %1, [%2, 1] \n" 418 " sub %0, %0, 1 \n" 419 "3: ;nop \n" 420 " .section .fixup, \"ax\" \n" 421 " .align 4 \n" 422 "4: j 3b \n" 423 " .previous \n" 424 " .section __ex_table, \"a\" \n" 425 " .align 4 \n" 426 " .word 1b, 4b \n" 427 " .previous \n" 428 429 : "+r" (n), 430 /* Note as an '&' earlyclobber operand to make sure the 431 * temporary register inside the loop is not the same as 432 * FROM or TO. 433 */ 434 "=&r" (tmp), "+r" (to), "+r" (from) 435 : 436 : "lp_count", "lp_start", "lp_end", "memory"); 437 438 return n; 439 } 440 441 if (__builtin_constant_p(orig_n)) { 442 res = orig_n; 443 444 if (orig_n / 16) { 445 orig_n = orig_n % 16; 446 447 __asm__ __volatile__( 448 " lsr lp_count, %7,4 \n" 449 " lp 3f \n" 450 " ld.ab %3, [%2, 4] \n" 451 " ld.ab %4, [%2, 4] \n" 452 " ld.ab %5, [%2, 4] \n" 453 " ld.ab %6, [%2, 4] \n" 454 "1: st.ab %3, [%1, 4] \n" 455 "11: st.ab %4, [%1, 4] \n" 456 "12: st.ab %5, [%1, 4] \n" 457 "13: st.ab %6, [%1, 4] \n" 458 " sub %0, %0, 16 \n" 459 "3:;nop \n" 460 " .section .fixup, \"ax\" \n" 461 " .align 4 \n" 462 "4: j 3b \n" 463 " .previous \n" 464 " .section __ex_table, \"a\" \n" 465 " .align 4 \n" 466 " .word 1b, 4b \n" 467 " .word 11b,4b \n" 468 " .word 12b,4b \n" 469 " .word 13b,4b \n" 470 " .previous \n" 471 : "+r" (res), "+r"(to), "+r"(from), 472 "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) 473 : "ir"(n) 474 : "lp_count", "memory"); 475 } 476 if (orig_n / 8) { 477 orig_n = orig_n % 8; 478 479 __asm__ __volatile__( 480 " ld.ab %3, [%2,4] \n" 481 " ld.ab %4, [%2,4] \n" 482 "14: st.ab %3, [%1,4] \n" 483 "15: st.ab %4, [%1,4] \n" 484 " sub %0, %0, 8 \n" 485 "31:;nop \n" 486 " .section .fixup, \"ax\" \n" 487 " .align 4 \n" 488 "4: j 31b \n" 489 " .previous \n" 490 " .section __ex_table, \"a\" \n" 491 " .align 4 \n" 492 " .word 14b,4b \n" 493 " .word 15b,4b \n" 494 " .previous \n" 495 : "+r" (res), "+r"(to), "+r"(from), 496 "=r"(tmp1), "=r"(tmp2) 497 : 498 : "memory"); 499 } 500 if (orig_n / 4) { 501 orig_n = orig_n % 4; 502 503 __asm__ __volatile__( 504 " ld.ab %3, [%2,4] \n" 505 "16: st.ab %3, [%1,4] \n" 506 " sub %0, %0, 4 \n" 507 "32:;nop \n" 508 " .section .fixup, \"ax\" \n" 509 " .align 4 \n" 510 "4: j 32b \n" 511 " .previous \n" 512 " .section __ex_table, \"a\" \n" 513 " .align 4 \n" 514 " .word 16b,4b \n" 515 " .previous \n" 516 : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) 517 : 518 : "memory"); 519 } 520 if (orig_n / 2) { 521 orig_n = orig_n % 2; 522 523 __asm__ __volatile__( 524 " ldw.ab %3, [%2,2] \n" 525 "17: stw.ab %3, [%1,2] \n" 526 " sub %0, %0, 2 \n" 527 "33:;nop \n" 528 " .section .fixup, \"ax\" \n" 529 " .align 4 \n" 530 "4: j 33b \n" 531 " .previous \n" 532 " .section __ex_table, \"a\" \n" 533 " .align 4 \n" 534 " .word 17b,4b \n" 535 " .previous \n" 536 : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) 537 : 538 : "memory"); 539 } 540 if (orig_n & 1) { 541 __asm__ __volatile__( 542 " ldb.ab %3, [%2,1] \n" 543 "18: stb.ab %3, [%1,1] \n" 544 " sub %0, %0, 1 \n" 545 "34: ;nop \n" 546 " .section .fixup, \"ax\" \n" 547 " .align 4 \n" 548 "4: j 34b \n" 549 " .previous \n" 550 " .section __ex_table, \"a\" \n" 551 " .align 4 \n" 552 " .word 18b,4b \n" 553 " .previous \n" 554 : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) 555 : 556 : "memory"); 557 } 558 } else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */ 559 560 __asm__ __volatile__( 561 " mov %0,%3 \n" 562 " lsr.f lp_count, %3,4 \n" /* 16x bytes */ 563 " lpnz 3f \n" 564 " ld.ab %5, [%2, 4] \n" 565 " ld.ab %6, [%2, 4] \n" 566 " ld.ab %7, [%2, 4] \n" 567 " ld.ab %8, [%2, 4] \n" 568 "1: st.ab %5, [%1, 4] \n" 569 "11: st.ab %6, [%1, 4] \n" 570 "12: st.ab %7, [%1, 4] \n" 571 "13: st.ab %8, [%1, 4] \n" 572 " sub %0, %0, 16 \n" 573 "3: and.f %3,%3,0xf \n" /* stragglers */ 574 " bz 34f \n" 575 " bbit0 %3,3,31f \n" /* 8 bytes left */ 576 " ld.ab %5, [%2,4] \n" 577 " ld.ab %6, [%2,4] \n" 578 "14: st.ab %5, [%1,4] \n" 579 "15: st.ab %6, [%1,4] \n" 580 " sub.f %0, %0, 8 \n" 581 "31: bbit0 %3,2,32f \n" /* 4 bytes left */ 582 " ld.ab %5, [%2,4] \n" 583 "16: st.ab %5, [%1,4] \n" 584 " sub.f %0, %0, 4 \n" 585 "32: bbit0 %3,1,33f \n" /* 2 bytes left */ 586 " ldw.ab %5, [%2,2] \n" 587 "17: stw.ab %5, [%1,2] \n" 588 " sub.f %0, %0, 2 \n" 589 "33: bbit0 %3,0,34f \n" 590 " ldb.ab %5, [%2,1] \n" /* 1 byte left */ 591 "18: stb.ab %5, [%1,1] \n" 592 " sub.f %0, %0, 1 \n" 593 "34: ;nop \n" 594 " .section .fixup, \"ax\" \n" 595 " .align 4 \n" 596 "4: j 34b \n" 597 " .previous \n" 598 " .section __ex_table, \"a\" \n" 599 " .align 4 \n" 600 " .word 1b, 4b \n" 601 " .word 11b,4b \n" 602 " .word 12b,4b \n" 603 " .word 13b,4b \n" 604 " .word 14b,4b \n" 605 " .word 15b,4b \n" 606 " .word 16b,4b \n" 607 " .word 17b,4b \n" 608 " .word 18b,4b \n" 609 " .previous \n" 610 : "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val), 611 "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) 612 : 613 : "lp_count", "memory"); 614 } 615 616 return res; 617 } 618 619 static inline unsigned long __arc_clear_user(void __user *to, unsigned long n) 620 { 621 long res = n; 622 unsigned char *d_char = to; 623 624 __asm__ __volatile__( 625 " bbit0 %0, 0, 1f \n" 626 "75: stb.ab %2, [%0,1] \n" 627 " sub %1, %1, 1 \n" 628 "1: bbit0 %0, 1, 2f \n" 629 "76: stw.ab %2, [%0,2] \n" 630 " sub %1, %1, 2 \n" 631 "2: asr.f lp_count, %1, 2 \n" 632 " lpnz 3f \n" 633 "77: st.ab %2, [%0,4] \n" 634 " sub %1, %1, 4 \n" 635 "3: bbit0 %1, 1, 4f \n" 636 "78: stw.ab %2, [%0,2] \n" 637 " sub %1, %1, 2 \n" 638 "4: bbit0 %1, 0, 5f \n" 639 "79: stb.ab %2, [%0,1] \n" 640 " sub %1, %1, 1 \n" 641 "5: \n" 642 " .section .fixup, \"ax\" \n" 643 " .align 4 \n" 644 "3: j 5b \n" 645 " .previous \n" 646 " .section __ex_table, \"a\" \n" 647 " .align 4 \n" 648 " .word 75b, 3b \n" 649 " .word 76b, 3b \n" 650 " .word 77b, 3b \n" 651 " .word 78b, 3b \n" 652 " .word 79b, 3b \n" 653 " .previous \n" 654 : "+r"(d_char), "+r"(res) 655 : "i"(0) 656 : "lp_count", "lp_start", "lp_end", "memory"); 657 658 return res; 659 } 660 661 static inline long 662 __arc_strncpy_from_user(char *dst, const char __user *src, long count) 663 { 664 long res = 0; 665 char val; 666 667 if (count == 0) 668 return 0; 669 670 __asm__ __volatile__( 671 " lp 3f \n" 672 "1: ldb.ab %3, [%2, 1] \n" 673 " breq.d %3, 0, 3f \n" 674 " stb.ab %3, [%1, 1] \n" 675 " add %0, %0, 1 # Num of NON NULL bytes copied \n" 676 "3: \n" 677 " .section .fixup, \"ax\" \n" 678 " .align 4 \n" 679 "4: mov %0, %4 # sets @res as -EFAULT \n" 680 " j 3b \n" 681 " .previous \n" 682 " .section __ex_table, \"a\" \n" 683 " .align 4 \n" 684 " .word 1b, 4b \n" 685 " .previous \n" 686 : "+r"(res), "+r"(dst), "+r"(src), "=r"(val) 687 : "g"(-EFAULT), "l"(count) 688 : "memory"); 689 690 return res; 691 } 692 693 static inline long __arc_strnlen_user(const char __user *s, long n) 694 { 695 long res, tmp1, cnt; 696 char val; 697 698 __asm__ __volatile__( 699 " mov %2, %1 \n" 700 "1: ldb.ab %3, [%0, 1] \n" 701 " breq.d %3, 0, 2f \n" 702 " sub.f %2, %2, 1 \n" 703 " bnz 1b \n" 704 " sub %2, %2, 1 \n" 705 "2: sub %0, %1, %2 \n" 706 "3: ;nop \n" 707 " .section .fixup, \"ax\" \n" 708 " .align 4 \n" 709 "4: mov %0, 0 \n" 710 " j 3b \n" 711 " .previous \n" 712 " .section __ex_table, \"a\" \n" 713 " .align 4 \n" 714 " .word 1b, 4b \n" 715 " .previous \n" 716 : "=r"(res), "=r"(tmp1), "=r"(cnt), "=r"(val) 717 : "0"(s), "1"(n) 718 : "memory"); 719 720 return res; 721 } 722 723 #ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 724 725 #define INLINE_COPY_TO_USER 726 #define INLINE_COPY_FROM_USER 727 728 #define __clear_user(d, n) __arc_clear_user(d, n) 729 #define __strncpy_from_user(d, s, n) __arc_strncpy_from_user(d, s, n) 730 #define __strnlen_user(s, n) __arc_strnlen_user(s, n) 731 #else 732 extern unsigned long arc_clear_user_noinline(void __user *to, 733 unsigned long n); 734 extern long arc_strncpy_from_user_noinline (char *dst, const char __user *src, 735 long count); 736 extern long arc_strnlen_user_noinline(const char __user *src, long n); 737 738 #define __clear_user(d, n) arc_clear_user_noinline(d, n) 739 #define __strncpy_from_user(d, s, n) arc_strncpy_from_user_noinline(d, s, n) 740 #define __strnlen_user(s, n) arc_strnlen_user_noinline(s, n) 741 742 #endif 743 744 #include <asm-generic/uaccess.h> 745 746 #endif 747