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 | /* | |
| 2547476a | 35 | * Algorithmically, for __user_ok() we want do: |
| 43697cb0 VG |
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 | * | |
| 0752adfd | 46 | * The reason for rewriting being, for majority of cases, @len is generally |
| 43697cb0 VG |
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) && \ | |
| 0752adfd | 56 | ((addr) <= (get_fs() - (sz)))) |
| 43697cb0 VG |
57 | #define __access_ok(addr, sz) (unlikely(__kernel_ok) || \ |
| 58 | likely(__user_ok((addr), (sz)))) | |
| 59 | ||
| 0a5eae45 VG |
60 | /*********** Single byte/hword/word copies ******************/ |
| 61 | ||
| 62 | #define __get_user_fn(sz, u, k) \ | |
| 63 | ({ \ | |
| 64 | long __ret = 0; /* success by default */ \ | |
| 65 | switch (sz) { \ | |
| 66 | case 1: __arc_get_user_one(*(k), u, "ldb", __ret); break; \ | |
| 67 | case 2: __arc_get_user_one(*(k), u, "ldw", __ret); break; \ | |
| 68 | case 4: __arc_get_user_one(*(k), u, "ld", __ret); break; \ | |
| 69 | case 8: __arc_get_user_one_64(*(k), u, __ret); break; \ | |
| 70 | } \ | |
| 71 | __ret; \ | |
| 72 | }) | |
| 73 | ||
| 74 | /* | |
| 75 | * Returns 0 on success, -EFAULT if not. | |
| 76 | * @ret already contains 0 - given that errors will be less likely | |
| 77 | * (hence +r asm constraint below). | |
| 78 | * In case of error, fixup code will make it -EFAULT | |
| 79 | */ | |
| 80 | #define __arc_get_user_one(dst, src, op, ret) \ | |
| 81 | __asm__ __volatile__( \ | |
| 82 | "1: "op" %1,[%2]\n" \ | |
| 83 | "2: ;nop\n" \ | |
| 84 | " .section .fixup, \"ax\"\n" \ | |
| 85 | " .align 4\n" \ | |
| 05d9d0b9 VG |
86 | "3: # return -EFAULT\n" \ |
| 87 | " mov %0, %3\n" \ | |
| 88 | " # zero out dst ptr\n" \ | |
| 89 | " mov %1, 0\n" \ | |
| 0a5eae45 VG |
90 | " j 2b\n" \ |
| 91 | " .previous\n" \ | |
| 92 | " .section __ex_table, \"a\"\n" \ | |
| 93 | " .align 4\n" \ | |
| 94 | " .word 1b,3b\n" \ | |
| 95 | " .previous\n" \ | |
| 96 | \ | |
| 97 | : "+r" (ret), "=r" (dst) \ | |
| 98 | : "r" (src), "ir" (-EFAULT)) | |
| 99 | ||
| 100 | #define __arc_get_user_one_64(dst, src, ret) \ | |
| 101 | __asm__ __volatile__( \ | |
| 102 | "1: ld %1,[%2]\n" \ | |
| 103 | "4: ld %R1,[%2, 4]\n" \ | |
| 104 | "2: ;nop\n" \ | |
| 105 | " .section .fixup, \"ax\"\n" \ | |
| 106 | " .align 4\n" \ | |
| 05d9d0b9 VG |
107 | "3: # return -EFAULT\n" \ |
| 108 | " mov %0, %3\n" \ | |
| 109 | " # zero out dst ptr\n" \ | |
| 110 | " mov %1, 0\n" \ | |
| 111 | " mov %R1, 0\n" \ | |
| 0a5eae45 VG |
112 | " j 2b\n" \ |
| 113 | " .previous\n" \ | |
| 114 | " .section __ex_table, \"a\"\n" \ | |
| 115 | " .align 4\n" \ | |
| 116 | " .word 1b,3b\n" \ | |
| 117 | " .word 4b,3b\n" \ | |
| 118 | " .previous\n" \ | |
| 119 | \ | |
| 120 | : "+r" (ret), "=r" (dst) \ | |
| 121 | : "r" (src), "ir" (-EFAULT)) | |
| 122 | ||
| 123 | #define __put_user_fn(sz, u, k) \ | |
| 124 | ({ \ | |
| 125 | long __ret = 0; /* success by default */ \ | |
| 126 | switch (sz) { \ | |
| 127 | case 1: __arc_put_user_one(*(k), u, "stb", __ret); break; \ | |
| 128 | case 2: __arc_put_user_one(*(k), u, "stw", __ret); break; \ | |
| 129 | case 4: __arc_put_user_one(*(k), u, "st", __ret); break; \ | |
| 130 | case 8: __arc_put_user_one_64(*(k), u, __ret); break; \ | |
| 131 | } \ | |
| 132 | __ret; \ | |
| 133 | }) | |
| 134 | ||
| 135 | #define __arc_put_user_one(src, dst, op, ret) \ | |
| 136 | __asm__ __volatile__( \ | |
| 137 | "1: "op" %1,[%2]\n" \ | |
| 138 | "2: ;nop\n" \ | |
| 139 | " .section .fixup, \"ax\"\n" \ | |
| 140 | " .align 4\n" \ | |
| 141 | "3: mov %0, %3\n" \ | |
| 142 | " j 2b\n" \ | |
| 143 | " .previous\n" \ | |
| 144 | " .section __ex_table, \"a\"\n" \ | |
| 145 | " .align 4\n" \ | |
| 146 | " .word 1b,3b\n" \ | |
| 147 | " .previous\n" \ | |
| 148 | \ | |
| 149 | : "+r" (ret) \ | |
| 150 | : "r" (src), "r" (dst), "ir" (-EFAULT)) | |
| 151 | ||
| 152 | #define __arc_put_user_one_64(src, dst, ret) \ | |
| 153 | __asm__ __volatile__( \ | |
| 154 | "1: st %1,[%2]\n" \ | |
| 155 | "4: st %R1,[%2, 4]\n" \ | |
| 156 | "2: ;nop\n" \ | |
| 157 | " .section .fixup, \"ax\"\n" \ | |
| 158 | " .align 4\n" \ | |
| 159 | "3: mov %0, %3\n" \ | |
| 160 | " j 2b\n" \ | |
| 161 | " .previous\n" \ | |
| 162 | " .section __ex_table, \"a\"\n" \ | |
| 163 | " .align 4\n" \ | |
| 164 | " .word 1b,3b\n" \ | |
| 165 | " .word 4b,3b\n" \ | |
| 166 | " .previous\n" \ | |
| 167 | \ | |
| 168 | : "+r" (ret) \ | |
| 169 | : "r" (src), "r" (dst), "ir" (-EFAULT)) | |
| 170 | ||
| 171 | ||
| 43697cb0 VG |
172 | static inline unsigned long |
| 173 | __arc_copy_from_user(void *to, const void __user *from, unsigned long n) | |
| 174 | { | |
| 175 | long res = 0; | |
| 176 | char val; | |
| 177 | unsigned long tmp1, tmp2, tmp3, tmp4; | |
| 178 | unsigned long orig_n = n; | |
| 179 | ||
| 180 | if (n == 0) | |
| 181 | return 0; | |
| 182 | ||
| 183 | /* unaligned */ | |
| 184 | if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { | |
| 185 | ||
| 186 | unsigned char tmp; | |
| 187 | ||
| 188 | __asm__ __volatile__ ( | |
| 189 | " mov.f lp_count, %0 \n" | |
| 190 | " lpnz 2f \n" | |
| 191 | "1: ldb.ab %1, [%3, 1] \n" | |
| 192 | " stb.ab %1, [%2, 1] \n" | |
| 193 | " sub %0,%0,1 \n" | |
| 194 | "2: ;nop \n" | |
| 195 | " .section .fixup, \"ax\" \n" | |
| 196 | " .align 4 \n" | |
| 197 | "3: j 2b \n" | |
| 198 | " .previous \n" | |
| 199 | " .section __ex_table, \"a\" \n" | |
| 200 | " .align 4 \n" | |
| 201 | " .word 1b, 3b \n" | |
| 202 | " .previous \n" | |
| 203 | ||
| 204 | : "+r" (n), | |
| 205 | /* | |
| 206 | * Note as an '&' earlyclobber operand to make sure the | |
| 207 | * temporary register inside the loop is not the same as | |
| 208 | * FROM or TO. | |
| 209 | */ | |
| 210 | "=&r" (tmp), "+r" (to), "+r" (from) | |
| 211 | : | |
| 212 | : "lp_count", "lp_start", "lp_end", "memory"); | |
| 213 | ||
| 214 | return n; | |
| 215 | } | |
| 216 | ||
| 217 | /* | |
| 218 | * Hand-crafted constant propagation to reduce code sz of the | |
| 219 | * laddered copy 16x,8,4,2,1 | |
| 220 | */ | |
| 221 | if (__builtin_constant_p(orig_n)) { | |
| 222 | res = orig_n; | |
| 223 | ||
| 224 | if (orig_n / 16) { | |
| 225 | orig_n = orig_n % 16; | |
| 226 | ||
| 227 | __asm__ __volatile__( | |
| 228 | " lsr lp_count, %7,4 \n" | |
| 229 | " lp 3f \n" | |
| 230 | "1: ld.ab %3, [%2, 4] \n" | |
| 231 | "11: ld.ab %4, [%2, 4] \n" | |
| 232 | "12: ld.ab %5, [%2, 4] \n" | |
| 233 | "13: ld.ab %6, [%2, 4] \n" | |
| 234 | " st.ab %3, [%1, 4] \n" | |
| 235 | " st.ab %4, [%1, 4] \n" | |
| 236 | " st.ab %5, [%1, 4] \n" | |
| 237 | " st.ab %6, [%1, 4] \n" | |
| 238 | " sub %0,%0,16 \n" | |
| 239 | "3: ;nop \n" | |
| 240 | " .section .fixup, \"ax\" \n" | |
| 241 | " .align 4 \n" | |
| 242 | "4: j 3b \n" | |
| 243 | " .previous \n" | |
| 244 | " .section __ex_table, \"a\" \n" | |
| 245 | " .align 4 \n" | |
| 246 | " .word 1b, 4b \n" | |
| 247 | " .word 11b,4b \n" | |
| 248 | " .word 12b,4b \n" | |
| 249 | " .word 13b,4b \n" | |
| 250 | " .previous \n" | |
| 251 | : "+r" (res), "+r"(to), "+r"(from), | |
| 252 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 253 | : "ir"(n) | |
| 254 | : "lp_count", "memory"); | |
| 255 | } | |
| 256 | if (orig_n / 8) { | |
| 257 | orig_n = orig_n % 8; | |
| 258 | ||
| 259 | __asm__ __volatile__( | |
| 260 | "14: ld.ab %3, [%2,4] \n" | |
| 261 | "15: ld.ab %4, [%2,4] \n" | |
| 262 | " st.ab %3, [%1,4] \n" | |
| 263 | " st.ab %4, [%1,4] \n" | |
| 264 | " sub %0,%0,8 \n" | |
| 265 | "31: ;nop \n" | |
| 266 | " .section .fixup, \"ax\" \n" | |
| 267 | " .align 4 \n" | |
| 268 | "4: j 31b \n" | |
| 269 | " .previous \n" | |
| 270 | " .section __ex_table, \"a\" \n" | |
| 271 | " .align 4 \n" | |
| 272 | " .word 14b,4b \n" | |
| 273 | " .word 15b,4b \n" | |
| 274 | " .previous \n" | |
| 275 | : "+r" (res), "+r"(to), "+r"(from), | |
| 276 | "=r"(tmp1), "=r"(tmp2) | |
| 277 | : | |
| 278 | : "memory"); | |
| 279 | } | |
| 280 | if (orig_n / 4) { | |
| 281 | orig_n = orig_n % 4; | |
| 282 | ||
| 283 | __asm__ __volatile__( | |
| 284 | "16: ld.ab %3, [%2,4] \n" | |
| 285 | " st.ab %3, [%1,4] \n" | |
| 286 | " sub %0,%0,4 \n" | |
| 287 | "32: ;nop \n" | |
| 288 | " .section .fixup, \"ax\" \n" | |
| 289 | " .align 4 \n" | |
| 290 | "4: j 32b \n" | |
| 291 | " .previous \n" | |
| 292 | " .section __ex_table, \"a\" \n" | |
| 293 | " .align 4 \n" | |
| 294 | " .word 16b,4b \n" | |
| 295 | " .previous \n" | |
| 296 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 297 | : | |
| 298 | : "memory"); | |
| 299 | } | |
| 300 | if (orig_n / 2) { | |
| 301 | orig_n = orig_n % 2; | |
| 302 | ||
| 303 | __asm__ __volatile__( | |
| 304 | "17: ldw.ab %3, [%2,2] \n" | |
| 305 | " stw.ab %3, [%1,2] \n" | |
| 306 | " sub %0,%0,2 \n" | |
| 307 | "33: ;nop \n" | |
| 308 | " .section .fixup, \"ax\" \n" | |
| 309 | " .align 4 \n" | |
| 310 | "4: j 33b \n" | |
| 311 | " .previous \n" | |
| 312 | " .section __ex_table, \"a\" \n" | |
| 313 | " .align 4 \n" | |
| 314 | " .word 17b,4b \n" | |
| 315 | " .previous \n" | |
| 316 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 317 | : | |
| 318 | : "memory"); | |
| 319 | } | |
| 320 | if (orig_n & 1) { | |
| 321 | __asm__ __volatile__( | |
| 322 | "18: ldb.ab %3, [%2,2] \n" | |
| 323 | " stb.ab %3, [%1,2] \n" | |
| 324 | " sub %0,%0,1 \n" | |
| 325 | "34: ; nop \n" | |
| 326 | " .section .fixup, \"ax\" \n" | |
| 327 | " .align 4 \n" | |
| 328 | "4: j 34b \n" | |
| 329 | " .previous \n" | |
| 330 | " .section __ex_table, \"a\" \n" | |
| 331 | " .align 4 \n" | |
| 332 | " .word 18b,4b \n" | |
| 333 | " .previous \n" | |
| 334 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 335 | : | |
| 336 | : "memory"); | |
| 337 | } | |
| 338 | } else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */ | |
| 339 | ||
| 340 | __asm__ __volatile__( | |
| 341 | " mov %0,%3 \n" | |
| 342 | " lsr.f lp_count, %3,4 \n" /* 16x bytes */ | |
| 343 | " lpnz 3f \n" | |
| 344 | "1: ld.ab %5, [%2, 4] \n" | |
| 345 | "11: ld.ab %6, [%2, 4] \n" | |
| 346 | "12: ld.ab %7, [%2, 4] \n" | |
| 347 | "13: ld.ab %8, [%2, 4] \n" | |
| 348 | " st.ab %5, [%1, 4] \n" | |
| 349 | " st.ab %6, [%1, 4] \n" | |
| 350 | " st.ab %7, [%1, 4] \n" | |
| 351 | " st.ab %8, [%1, 4] \n" | |
| 352 | " sub %0,%0,16 \n" | |
| 353 | "3: and.f %3,%3,0xf \n" /* stragglers */ | |
| 354 | " bz 34f \n" | |
| 355 | " bbit0 %3,3,31f \n" /* 8 bytes left */ | |
| 356 | "14: ld.ab %5, [%2,4] \n" | |
| 357 | "15: ld.ab %6, [%2,4] \n" | |
| 358 | " st.ab %5, [%1,4] \n" | |
| 359 | " st.ab %6, [%1,4] \n" | |
| 360 | " sub.f %0,%0,8 \n" | |
| 361 | "31: bbit0 %3,2,32f \n" /* 4 bytes left */ | |
| 362 | "16: ld.ab %5, [%2,4] \n" | |
| 363 | " st.ab %5, [%1,4] \n" | |
| 364 | " sub.f %0,%0,4 \n" | |
| 365 | "32: bbit0 %3,1,33f \n" /* 2 bytes left */ | |
| 366 | "17: ldw.ab %5, [%2,2] \n" | |
| 367 | " stw.ab %5, [%1,2] \n" | |
| 368 | " sub.f %0,%0,2 \n" | |
| 369 | "33: bbit0 %3,0,34f \n" | |
| 370 | "18: ldb.ab %5, [%2,1] \n" /* 1 byte left */ | |
| 371 | " stb.ab %5, [%1,1] \n" | |
| 372 | " sub.f %0,%0,1 \n" | |
| 373 | "34: ;nop \n" | |
| 374 | " .section .fixup, \"ax\" \n" | |
| 375 | " .align 4 \n" | |
| 376 | "4: j 34b \n" | |
| 377 | " .previous \n" | |
| 378 | " .section __ex_table, \"a\" \n" | |
| 379 | " .align 4 \n" | |
| 380 | " .word 1b, 4b \n" | |
| 381 | " .word 11b,4b \n" | |
| 382 | " .word 12b,4b \n" | |
| 383 | " .word 13b,4b \n" | |
| 384 | " .word 14b,4b \n" | |
| 385 | " .word 15b,4b \n" | |
| 386 | " .word 16b,4b \n" | |
| 387 | " .word 17b,4b \n" | |
| 388 | " .word 18b,4b \n" | |
| 389 | " .previous \n" | |
| 390 | : "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val), | |
| 391 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 392 | : | |
| 393 | : "lp_count", "memory"); | |
| 394 | } | |
| 395 | ||
| 396 | return res; | |
| 397 | } | |
| 398 | ||
| 399 | extern unsigned long slowpath_copy_to_user(void __user *to, const void *from, | |
| 400 | unsigned long n); | |
| 401 | ||
| 402 | static inline unsigned long | |
| 403 | __arc_copy_to_user(void __user *to, const void *from, unsigned long n) | |
| 404 | { | |
| 405 | long res = 0; | |
| 406 | char val; | |
| 407 | unsigned long tmp1, tmp2, tmp3, tmp4; | |
| 408 | unsigned long orig_n = n; | |
| 409 | ||
| 410 | if (n == 0) | |
| 411 | return 0; | |
| 412 | ||
| 413 | /* unaligned */ | |
| 414 | if (((unsigned long)to & 0x3) || ((unsigned long)from & 0x3)) { | |
| 415 | ||
| 416 | unsigned char tmp; | |
| 417 | ||
| 418 | __asm__ __volatile__( | |
| 419 | " mov.f lp_count, %0 \n" | |
| 420 | " lpnz 3f \n" | |
| 421 | " ldb.ab %1, [%3, 1] \n" | |
| 422 | "1: stb.ab %1, [%2, 1] \n" | |
| 423 | " sub %0, %0, 1 \n" | |
| 424 | "3: ;nop \n" | |
| 425 | " .section .fixup, \"ax\" \n" | |
| 426 | " .align 4 \n" | |
| 427 | "4: j 3b \n" | |
| 428 | " .previous \n" | |
| 429 | " .section __ex_table, \"a\" \n" | |
| 430 | " .align 4 \n" | |
| 431 | " .word 1b, 4b \n" | |
| 432 | " .previous \n" | |
| 433 | ||
| 434 | : "+r" (n), | |
| 435 | /* Note as an '&' earlyclobber operand to make sure the | |
| 436 | * temporary register inside the loop is not the same as | |
| 437 | * FROM or TO. | |
| 438 | */ | |
| 439 | "=&r" (tmp), "+r" (to), "+r" (from) | |
| 440 | : | |
| 441 | : "lp_count", "lp_start", "lp_end", "memory"); | |
| 442 | ||
| 443 | return n; | |
| 444 | } | |
| 445 | ||
| 446 | if (__builtin_constant_p(orig_n)) { | |
| 447 | res = orig_n; | |
| 448 | ||
| 449 | if (orig_n / 16) { | |
| 450 | orig_n = orig_n % 16; | |
| 451 | ||
| 452 | __asm__ __volatile__( | |
| 453 | " lsr lp_count, %7,4 \n" | |
| 454 | " lp 3f \n" | |
| 455 | " ld.ab %3, [%2, 4] \n" | |
| 456 | " ld.ab %4, [%2, 4] \n" | |
| 457 | " ld.ab %5, [%2, 4] \n" | |
| 458 | " ld.ab %6, [%2, 4] \n" | |
| 459 | "1: st.ab %3, [%1, 4] \n" | |
| 460 | "11: st.ab %4, [%1, 4] \n" | |
| 461 | "12: st.ab %5, [%1, 4] \n" | |
| 462 | "13: st.ab %6, [%1, 4] \n" | |
| 463 | " sub %0, %0, 16 \n" | |
| 464 | "3:;nop \n" | |
| 465 | " .section .fixup, \"ax\" \n" | |
| 466 | " .align 4 \n" | |
| 467 | "4: j 3b \n" | |
| 468 | " .previous \n" | |
| 469 | " .section __ex_table, \"a\" \n" | |
| 470 | " .align 4 \n" | |
| 471 | " .word 1b, 4b \n" | |
| 472 | " .word 11b,4b \n" | |
| 473 | " .word 12b,4b \n" | |
| 474 | " .word 13b,4b \n" | |
| 475 | " .previous \n" | |
| 476 | : "+r" (res), "+r"(to), "+r"(from), | |
| 477 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 478 | : "ir"(n) | |
| 479 | : "lp_count", "memory"); | |
| 480 | } | |
| 481 | if (orig_n / 8) { | |
| 482 | orig_n = orig_n % 8; | |
| 483 | ||
| 484 | __asm__ __volatile__( | |
| 485 | " ld.ab %3, [%2,4] \n" | |
| 486 | " ld.ab %4, [%2,4] \n" | |
| 487 | "14: st.ab %3, [%1,4] \n" | |
| 488 | "15: st.ab %4, [%1,4] \n" | |
| 489 | " sub %0, %0, 8 \n" | |
| 490 | "31:;nop \n" | |
| 491 | " .section .fixup, \"ax\" \n" | |
| 492 | " .align 4 \n" | |
| 493 | "4: j 31b \n" | |
| 494 | " .previous \n" | |
| 495 | " .section __ex_table, \"a\" \n" | |
| 496 | " .align 4 \n" | |
| 497 | " .word 14b,4b \n" | |
| 498 | " .word 15b,4b \n" | |
| 499 | " .previous \n" | |
| 500 | : "+r" (res), "+r"(to), "+r"(from), | |
| 501 | "=r"(tmp1), "=r"(tmp2) | |
| 502 | : | |
| 503 | : "memory"); | |
| 504 | } | |
| 505 | if (orig_n / 4) { | |
| 506 | orig_n = orig_n % 4; | |
| 507 | ||
| 508 | __asm__ __volatile__( | |
| 509 | " ld.ab %3, [%2,4] \n" | |
| 510 | "16: st.ab %3, [%1,4] \n" | |
| 511 | " sub %0, %0, 4 \n" | |
| 512 | "32:;nop \n" | |
| 513 | " .section .fixup, \"ax\" \n" | |
| 514 | " .align 4 \n" | |
| 515 | "4: j 32b \n" | |
| 516 | " .previous \n" | |
| 517 | " .section __ex_table, \"a\" \n" | |
| 518 | " .align 4 \n" | |
| 519 | " .word 16b,4b \n" | |
| 520 | " .previous \n" | |
| 521 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 522 | : | |
| 523 | : "memory"); | |
| 524 | } | |
| 525 | if (orig_n / 2) { | |
| 526 | orig_n = orig_n % 2; | |
| 527 | ||
| 528 | __asm__ __volatile__( | |
| 529 | " ldw.ab %3, [%2,2] \n" | |
| 530 | "17: stw.ab %3, [%1,2] \n" | |
| 531 | " sub %0, %0, 2 \n" | |
| 532 | "33:;nop \n" | |
| 533 | " .section .fixup, \"ax\" \n" | |
| 534 | " .align 4 \n" | |
| 535 | "4: j 33b \n" | |
| 536 | " .previous \n" | |
| 537 | " .section __ex_table, \"a\" \n" | |
| 538 | " .align 4 \n" | |
| 539 | " .word 17b,4b \n" | |
| 540 | " .previous \n" | |
| 541 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 542 | : | |
| 543 | : "memory"); | |
| 544 | } | |
| 545 | if (orig_n & 1) { | |
| 546 | __asm__ __volatile__( | |
| 547 | " ldb.ab %3, [%2,1] \n" | |
| 548 | "18: stb.ab %3, [%1,1] \n" | |
| 549 | " sub %0, %0, 1 \n" | |
| 550 | "34: ;nop \n" | |
| 551 | " .section .fixup, \"ax\" \n" | |
| 552 | " .align 4 \n" | |
| 553 | "4: j 34b \n" | |
| 554 | " .previous \n" | |
| 555 | " .section __ex_table, \"a\" \n" | |
| 556 | " .align 4 \n" | |
| 557 | " .word 18b,4b \n" | |
| 558 | " .previous \n" | |
| 559 | : "+r" (res), "+r"(to), "+r"(from), "=r"(tmp1) | |
| 560 | : | |
| 561 | : "memory"); | |
| 562 | } | |
| 563 | } else { /* n is NOT constant, so laddered copy of 16x,8,4,2,1 */ | |
| 564 | ||
| 565 | __asm__ __volatile__( | |
| 566 | " mov %0,%3 \n" | |
| 567 | " lsr.f lp_count, %3,4 \n" /* 16x bytes */ | |
| 568 | " lpnz 3f \n" | |
| 569 | " ld.ab %5, [%2, 4] \n" | |
| 570 | " ld.ab %6, [%2, 4] \n" | |
| 571 | " ld.ab %7, [%2, 4] \n" | |
| 572 | " ld.ab %8, [%2, 4] \n" | |
| 573 | "1: st.ab %5, [%1, 4] \n" | |
| 574 | "11: st.ab %6, [%1, 4] \n" | |
| 575 | "12: st.ab %7, [%1, 4] \n" | |
| 576 | "13: st.ab %8, [%1, 4] \n" | |
| 577 | " sub %0, %0, 16 \n" | |
| 578 | "3: and.f %3,%3,0xf \n" /* stragglers */ | |
| 579 | " bz 34f \n" | |
| 580 | " bbit0 %3,3,31f \n" /* 8 bytes left */ | |
| 581 | " ld.ab %5, [%2,4] \n" | |
| 582 | " ld.ab %6, [%2,4] \n" | |
| 583 | "14: st.ab %5, [%1,4] \n" | |
| 584 | "15: st.ab %6, [%1,4] \n" | |
| 585 | " sub.f %0, %0, 8 \n" | |
| 586 | "31: bbit0 %3,2,32f \n" /* 4 bytes left */ | |
| 587 | " ld.ab %5, [%2,4] \n" | |
| 588 | "16: st.ab %5, [%1,4] \n" | |
| 589 | " sub.f %0, %0, 4 \n" | |
| 590 | "32: bbit0 %3,1,33f \n" /* 2 bytes left */ | |
| 591 | " ldw.ab %5, [%2,2] \n" | |
| 592 | "17: stw.ab %5, [%1,2] \n" | |
| 593 | " sub.f %0, %0, 2 \n" | |
| 594 | "33: bbit0 %3,0,34f \n" | |
| 595 | " ldb.ab %5, [%2,1] \n" /* 1 byte left */ | |
| 596 | "18: stb.ab %5, [%1,1] \n" | |
| 597 | " sub.f %0, %0, 1 \n" | |
| 598 | "34: ;nop \n" | |
| 599 | " .section .fixup, \"ax\" \n" | |
| 600 | " .align 4 \n" | |
| 601 | "4: j 34b \n" | |
| 602 | " .previous \n" | |
| 603 | " .section __ex_table, \"a\" \n" | |
| 604 | " .align 4 \n" | |
| 605 | " .word 1b, 4b \n" | |
| 606 | " .word 11b,4b \n" | |
| 607 | " .word 12b,4b \n" | |
| 608 | " .word 13b,4b \n" | |
| 609 | " .word 14b,4b \n" | |
| 610 | " .word 15b,4b \n" | |
| 611 | " .word 16b,4b \n" | |
| 612 | " .word 17b,4b \n" | |
| 613 | " .word 18b,4b \n" | |
| 614 | " .previous \n" | |
| 615 | : "=r" (res), "+r"(to), "+r"(from), "+r"(n), "=r"(val), | |
| 616 | "=r"(tmp1), "=r"(tmp2), "=r"(tmp3), "=r"(tmp4) | |
| 617 | : | |
| 618 | : "lp_count", "memory"); | |
| 619 | } | |
| 620 | ||
| 621 | return res; | |
| 622 | } | |
| 623 | ||
| 624 | static inline unsigned long __arc_clear_user(void __user *to, unsigned long n) | |
| 625 | { | |
| 626 | long res = n; | |
| 627 | unsigned char *d_char = to; | |
| 628 | ||
| 629 | __asm__ __volatile__( | |
| 630 | " bbit0 %0, 0, 1f \n" | |
| 631 | "75: stb.ab %2, [%0,1] \n" | |
| 632 | " sub %1, %1, 1 \n" | |
| 633 | "1: bbit0 %0, 1, 2f \n" | |
| 634 | "76: stw.ab %2, [%0,2] \n" | |
| 635 | " sub %1, %1, 2 \n" | |
| 636 | "2: asr.f lp_count, %1, 2 \n" | |
| 637 | " lpnz 3f \n" | |
| 638 | "77: st.ab %2, [%0,4] \n" | |
| 639 | " sub %1, %1, 4 \n" | |
| 640 | "3: bbit0 %1, 1, 4f \n" | |
| 641 | "78: stw.ab %2, [%0,2] \n" | |
| 642 | " sub %1, %1, 2 \n" | |
| 643 | "4: bbit0 %1, 0, 5f \n" | |
| 644 | "79: stb.ab %2, [%0,1] \n" | |
| 645 | " sub %1, %1, 1 \n" | |
| 646 | "5: \n" | |
| 647 | " .section .fixup, \"ax\" \n" | |
| 648 | " .align 4 \n" | |
| 649 | "3: j 5b \n" | |
| 650 | " .previous \n" | |
| 651 | " .section __ex_table, \"a\" \n" | |
| 652 | " .align 4 \n" | |
| 653 | " .word 75b, 3b \n" | |
| 654 | " .word 76b, 3b \n" | |
| 655 | " .word 77b, 3b \n" | |
| 656 | " .word 78b, 3b \n" | |
| 657 | " .word 79b, 3b \n" | |
| 658 | " .previous \n" | |
| 659 | : "+r"(d_char), "+r"(res) | |
| 660 | : "i"(0) | |
| 661 | : "lp_count", "lp_start", "lp_end", "memory"); | |
| 662 | ||
| 663 | return res; | |
| 664 | } | |
| 665 | ||
| 666 | static inline long | |
| 667 | __arc_strncpy_from_user(char *dst, const char __user *src, long count) | |
| 668 | { | |
| 8922bc30 | 669 | long res = 0; |
| 43697cb0 | 670 | char val; |
| 43697cb0 VG |
671 | |
| 672 | if (count == 0) | |
| 673 | return 0; | |
| 674 | ||
| 675 | __asm__ __volatile__( | |
| 8922bc30 | 676 | " lp 3f \n" |
| 43697cb0 | 677 | "1: ldb.ab %3, [%2, 1] \n" |
| 8922bc30 | 678 | " breq.d %3, 0, 3f \n" |
| 43697cb0 | 679 | " stb.ab %3, [%1, 1] \n" |
| 8922bc30 VG |
680 | " add %0, %0, 1 # Num of NON NULL bytes copied \n" |
| 681 | "3: \n" | |
| 43697cb0 VG |
682 | " .section .fixup, \"ax\" \n" |
| 683 | " .align 4 \n" | |
| 8922bc30 | 684 | "4: mov %0, %4 # sets @res as -EFAULT \n" |
| 43697cb0 VG |
685 | " j 3b \n" |
| 686 | " .previous \n" | |
| 687 | " .section __ex_table, \"a\" \n" | |
| 688 | " .align 4 \n" | |
| 689 | " .word 1b, 4b \n" | |
| 690 | " .previous \n" | |
| 8922bc30 VG |
691 | : "+r"(res), "+r"(dst), "+r"(src), "=r"(val) |
| 692 | : "g"(-EFAULT), "l"(count) | |
| 43697cb0 VG |
693 | : "memory"); |
| 694 | ||
| 695 | return res; | |
| 696 | } | |
| 697 | ||
| 698 | static inline long __arc_strnlen_user(const char __user *s, long n) | |
| 699 | { | |
| 700 | long res, tmp1, cnt; | |
| 701 | char val; | |
| 702 | ||
| 703 | __asm__ __volatile__( | |
| 704 | " mov %2, %1 \n" | |
| 705 | "1: ldb.ab %3, [%0, 1] \n" | |
| 706 | " breq.d %3, 0, 2f \n" | |
| 707 | " sub.f %2, %2, 1 \n" | |
| 708 | " bnz 1b \n" | |
| 709 | " sub %2, %2, 1 \n" | |
| 710 | "2: sub %0, %1, %2 \n" | |
| 711 | "3: ;nop \n" | |
| 712 | " .section .fixup, \"ax\" \n" | |
| 713 | " .align 4 \n" | |
| 714 | "4: mov %0, 0 \n" | |
| 715 | " j 3b \n" | |
| 716 | " .previous \n" | |
| 717 | " .section __ex_table, \"a\" \n" | |
| 718 | " .align 4 \n" | |
| 719 | " .word 1b, 4b \n" | |
| 720 | " .previous \n" | |
| 721 | : "=r"(res), "=r"(tmp1), "=r"(cnt), "=r"(val) | |
| 722 | : "0"(s), "1"(n) | |
| 723 | : "memory"); | |
| 724 | ||
| 725 | return res; | |
| 726 | } | |
| 727 | ||
| 728 | #ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE | |
| 729 | #define __copy_from_user(t, f, n) __arc_copy_from_user(t, f, n) | |
| 730 | #define __copy_to_user(t, f, n) __arc_copy_to_user(t, f, n) | |
| 731 | #define __clear_user(d, n) __arc_clear_user(d, n) | |
| 732 | #define __strncpy_from_user(d, s, n) __arc_strncpy_from_user(d, s, n) | |
| 733 | #define __strnlen_user(s, n) __arc_strnlen_user(s, n) | |
| 734 | #else | |
| 735 | extern long arc_copy_from_user_noinline(void *to, const void __user * from, | |
| 736 | unsigned long n); | |
| 737 | extern long arc_copy_to_user_noinline(void __user *to, const void *from, | |
| 738 | unsigned long n); | |
| 739 | extern unsigned long arc_clear_user_noinline(void __user *to, | |
| 740 | unsigned long n); | |
| 741 | extern long arc_strncpy_from_user_noinline (char *dst, const char __user *src, | |
| 742 | long count); | |
| 743 | extern long arc_strnlen_user_noinline(const char __user *src, long n); | |
| 744 | ||
| 745 | #define __copy_from_user(t, f, n) arc_copy_from_user_noinline(t, f, n) | |
| 746 | #define __copy_to_user(t, f, n) arc_copy_to_user_noinline(t, f, n) | |
| 747 | #define __clear_user(d, n) arc_clear_user_noinline(d, n) | |
| 748 | #define __strncpy_from_user(d, s, n) arc_strncpy_from_user_noinline(d, s, n) | |
| 749 | #define __strnlen_user(s, n) arc_strnlen_user_noinline(s, n) | |
| 750 | ||
| 751 | #endif | |
| 752 | ||
| 753 | #include <asm-generic/uaccess.h> | |
| 754 | ||
| 755 | extern int fixup_exception(struct pt_regs *regs); | |
| 756 | ||
| 757 | #endif |