git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 51533b61 MS |
1 | /* |
| 2 | * Authors: Hans-Peter Nilsson (hp@axis.com) | |
| 3 | * | |
| 4 | */ | |
| 5 | #ifndef _CRIS_ARCH_UACCESS_H | |
| 6 | #define _CRIS_ARCH_UACCESS_H | |
| 7 | ||
| 8 | /* | |
| 9 | * We don't tell gcc that we are accessing memory, but this is OK | |
| 10 | * because we do not write to any memory gcc knows about, so there | |
| 11 | * are no aliasing issues. | |
| 12 | * | |
| 13 | * Note that PC at a fault is the address *at* the faulting | |
| 14 | * instruction for CRISv32. | |
| 15 | */ | |
| 16 | #define __put_user_asm(x, addr, err, op) \ | |
| 17 | __asm__ __volatile__( \ | |
| 18 | "2: "op" %1,[%2]\n" \ | |
| 19 | "4:\n" \ | |
| 20 | " .section .fixup,\"ax\"\n" \ | |
| 21 | "3: move.d %3,%0\n" \ | |
| 22 | " jump 4b\n" \ | |
| 23 | " nop\n" \ | |
| 24 | " .previous\n" \ | |
| 25 | " .section __ex_table,\"a\"\n" \ | |
| 26 | " .dword 2b,3b\n" \ | |
| 27 | " .previous\n" \ | |
| 28 | : "=r" (err) \ | |
| 29 | : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err)) | |
| 30 | ||
| 31 | #define __put_user_asm_64(x, addr, err) do { \ | |
| 32 | int dummy_for_put_user_asm_64_; \ | |
| 33 | __asm__ __volatile__( \ | |
| 34 | "2: move.d %M2,[%1+]\n" \ | |
| 35 | "4: move.d %H2,[%1]\n" \ | |
| 36 | "5:\n" \ | |
| 37 | " .section .fixup,\"ax\"\n" \ | |
| 38 | "3: move.d %4,%0\n" \ | |
| 39 | " jump 5b\n" \ | |
| 40 | " .previous\n" \ | |
| 41 | " .section __ex_table,\"a\"\n" \ | |
| 42 | " .dword 2b,3b\n" \ | |
| 43 | " .dword 4b,3b\n" \ | |
| 44 | " .previous\n" \ | |
| 45 | : "=r" (err), "=b" (dummy_for_put_user_asm_64_) \ | |
| 46 | : "r" (x), "1" (addr), "g" (-EFAULT), \ | |
| 47 | "0" (err)); \ | |
| 48 | } while (0) | |
| 49 | ||
| 50 | /* See comment before __put_user_asm. */ | |
| 51 | ||
| 52 | #define __get_user_asm(x, addr, err, op) \ | |
| 53 | __asm__ __volatile__( \ | |
| 54 | "2: "op" [%2],%1\n" \ | |
| 55 | "4:\n" \ | |
| 56 | " .section .fixup,\"ax\"\n" \ | |
| 57 | "3: move.d %3,%0\n" \ | |
| 58 | " jump 4b\n" \ | |
| 59 | " moveq 0,%1\n" \ | |
| 60 | " .previous\n" \ | |
| 61 | " .section __ex_table,\"a\"\n" \ | |
| 62 | " .dword 2b,3b\n" \ | |
| 63 | " .previous\n" \ | |
| 64 | : "=r" (err), "=r" (x) \ | |
| 65 | : "r" (addr), "g" (-EFAULT), "0" (err)) | |
| 66 | ||
| 67 | #define __get_user_asm_64(x, addr, err) do { \ | |
| 68 | int dummy_for_get_user_asm_64_; \ | |
| 69 | __asm__ __volatile__( \ | |
| 70 | "2: move.d [%2+],%M1\n" \ | |
| 71 | "4: move.d [%2],%H1\n" \ | |
| 72 | "5:\n" \ | |
| 73 | " .section .fixup,\"ax\"\n" \ | |
| 74 | "3: move.d %4,%0\n" \ | |
| 75 | " jump 5b\n" \ | |
| 76 | " moveq 0,%1\n" \ | |
| 77 | " .previous\n" \ | |
| 78 | " .section __ex_table,\"a\"\n" \ | |
| 79 | " .dword 2b,3b\n" \ | |
| 80 | " .dword 4b,3b\n" \ | |
| 81 | " .previous\n" \ | |
| 82 | : "=r" (err), "=r" (x), \ | |
| 83 | "=b" (dummy_for_get_user_asm_64_) \ | |
| 84 | : "2" (addr), "g" (-EFAULT), "0" (err));\ | |
| 85 | } while (0) | |
| 86 | ||
| 87 | /* | |
| 88 | * Copy a null terminated string from userspace. | |
| 89 | * | |
| 90 | * Must return: | |
| 91 | * -EFAULT for an exception | |
| 92 | * count if we hit the buffer limit | |
| 93 | * bytes copied if we hit a null byte | |
| 94 | * (without the null byte) | |
| 95 | */ | |
| d9b5444e | 96 | static inline long |
| 51533b61 MS |
97 | __do_strncpy_from_user(char *dst, const char *src, long count) |
| 98 | { | |
| 99 | long res; | |
| 100 | ||
| 101 | if (count == 0) | |
| 102 | return 0; | |
| 103 | ||
| 104 | /* | |
| 105 | * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop. | |
| 106 | * So do we. | |
| 107 | * | |
| 108 | * This code is deduced from: | |
| 109 | * | |
| 110 | * char tmp2; | |
| 111 | * long tmp1, tmp3; | |
| 112 | * tmp1 = count; | |
| 113 | * while ((*dst++ = (tmp2 = *src++)) != 0 | |
| 114 | * && --tmp1) | |
| 115 | * ; | |
| 116 | * | |
| 117 | * res = count - tmp1; | |
| 118 | * | |
| 119 | * with tweaks. | |
| 120 | */ | |
| 121 | ||
| 122 | __asm__ __volatile__ ( | |
| 123 | " move.d %3,%0\n" | |
| 124 | "5: move.b [%2+],$acr\n" | |
| 125 | "1: beq 2f\n" | |
| 126 | " move.b $acr,[%1+]\n" | |
| 127 | ||
| 128 | " subq 1,%0\n" | |
| 129 | "2: bne 1b\n" | |
| 130 | " move.b [%2+],$acr\n" | |
| 131 | ||
| 132 | " sub.d %3,%0\n" | |
| 133 | " neg.d %0,%0\n" | |
| 134 | "3:\n" | |
| 135 | " .section .fixup,\"ax\"\n" | |
| 136 | "4: move.d %7,%0\n" | |
| 137 | " jump 3b\n" | |
| 138 | " nop\n" | |
| 139 | ||
| 140 | /* The address for a fault at the first move is trivial. | |
| 141 | The address for a fault at the second move is that of | |
| 142 | the preceding branch insn, since the move insn is in | |
| 143 | its delay-slot. That address is also a branch | |
| 144 | target. Just so you don't get confused... */ | |
| 145 | " .previous\n" | |
| 146 | " .section __ex_table,\"a\"\n" | |
| 147 | " .dword 5b,4b\n" | |
| 148 | " .dword 2b,4b\n" | |
| 149 | " .previous" | |
| 150 | : "=r" (res), "=b" (dst), "=b" (src), "=r" (count) | |
| 151 | : "3" (count), "1" (dst), "2" (src), "g" (-EFAULT) | |
| 152 | : "acr"); | |
| 153 | ||
| 154 | return res; | |
| 155 | } | |
| 156 | ||
| 157 | /* A few copy asms to build up the more complex ones from. | |
| 158 | ||
| 159 | Note again, a post-increment is performed regardless of whether a bus | |
| 160 | fault occurred in that instruction, and PC for a faulted insn is the | |
| 161 | address for the insn, or for the preceding branch when in a delay-slot. */ | |
| 162 | ||
| 163 | #define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 164 | __asm__ __volatile__ ( \ | |
| 165 | COPY \ | |
| 166 | "1:\n" \ | |
| 167 | " .section .fixup,\"ax\"\n" \ | |
| 168 | FIXUP \ | |
| 169 | " .previous\n" \ | |
| 170 | " .section __ex_table,\"a\"\n" \ | |
| 171 | TENTRY \ | |
| 172 | " .previous\n" \ | |
| 173 | : "=b" (to), "=b" (from), "=r" (ret) \ | |
| 174 | : "0" (to), "1" (from), "2" (ret) \ | |
| 175 | : "acr", "memory") | |
| 176 | ||
| 177 | #define __asm_copy_from_user_1(to, from, ret) \ | |
| 178 | __asm_copy_user_cont(to, from, ret, \ | |
| 179 | "2: move.b [%1+],$acr\n" \ | |
| 180 | " move.b $acr,[%0+]\n", \ | |
| 181 | "3: addq 1,%2\n" \ | |
| 182 | " jump 1b\n" \ | |
| 183 | " clear.b [%0+]\n", \ | |
| 184 | " .dword 2b,3b\n") | |
| 185 | ||
| 186 | #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 187 | __asm_copy_user_cont(to, from, ret, \ | |
| 188 | COPY \ | |
| 189 | "2: move.w [%1+],$acr\n" \ | |
| 190 | " move.w $acr,[%0+]\n", \ | |
| 191 | FIXUP \ | |
| 192 | "3: addq 2,%2\n" \ | |
| 193 | " jump 1b\n" \ | |
| 194 | " clear.w [%0+]\n", \ | |
| 195 | TENTRY \ | |
| 196 | " .dword 2b,3b\n") | |
| 197 | ||
| 198 | #define __asm_copy_from_user_2(to, from, ret) \ | |
| 199 | __asm_copy_from_user_2x_cont(to, from, ret, "", "", "") | |
| 200 | ||
| 201 | #define __asm_copy_from_user_3(to, from, ret) \ | |
| 202 | __asm_copy_from_user_2x_cont(to, from, ret, \ | |
| 203 | "4: move.b [%1+],$acr\n" \ | |
| 204 | " move.b $acr,[%0+]\n", \ | |
| 205 | "5: addq 1,%2\n" \ | |
| 206 | " clear.b [%0+]\n", \ | |
| 207 | " .dword 4b,5b\n") | |
| 208 | ||
| 209 | #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 210 | __asm_copy_user_cont(to, from, ret, \ | |
| 211 | COPY \ | |
| 212 | "2: move.d [%1+],$acr\n" \ | |
| 213 | " move.d $acr,[%0+]\n", \ | |
| 214 | FIXUP \ | |
| 215 | "3: addq 4,%2\n" \ | |
| 216 | " jump 1b\n" \ | |
| 217 | " clear.d [%0+]\n", \ | |
| 218 | TENTRY \ | |
| 219 | " .dword 2b,3b\n") | |
| 220 | ||
| 221 | #define __asm_copy_from_user_4(to, from, ret) \ | |
| 222 | __asm_copy_from_user_4x_cont(to, from, ret, "", "", "") | |
| 223 | ||
| 224 | #define __asm_copy_from_user_5(to, from, ret) \ | |
| 225 | __asm_copy_from_user_4x_cont(to, from, ret, \ | |
| 226 | "4: move.b [%1+],$acr\n" \ | |
| 227 | " move.b $acr,[%0+]\n", \ | |
| 228 | "5: addq 1,%2\n" \ | |
| 229 | " clear.b [%0+]\n", \ | |
| 230 | " .dword 4b,5b\n") | |
| 231 | ||
| 232 | #define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 233 | __asm_copy_from_user_4x_cont(to, from, ret, \ | |
| 234 | COPY \ | |
| 235 | "4: move.w [%1+],$acr\n" \ | |
| 236 | " move.w $acr,[%0+]\n", \ | |
| 237 | FIXUP \ | |
| 238 | "5: addq 2,%2\n" \ | |
| 239 | " clear.w [%0+]\n", \ | |
| 240 | TENTRY \ | |
| 241 | " .dword 4b,5b\n") | |
| 242 | ||
| 243 | #define __asm_copy_from_user_6(to, from, ret) \ | |
| 244 | __asm_copy_from_user_6x_cont(to, from, ret, "", "", "") | |
| 245 | ||
| 246 | #define __asm_copy_from_user_7(to, from, ret) \ | |
| 247 | __asm_copy_from_user_6x_cont(to, from, ret, \ | |
| 248 | "6: move.b [%1+],$acr\n" \ | |
| 249 | " move.b $acr,[%0+]\n", \ | |
| 250 | "7: addq 1,%2\n" \ | |
| 251 | " clear.b [%0+]\n", \ | |
| 252 | " .dword 6b,7b\n") | |
| 253 | ||
| 254 | #define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 255 | __asm_copy_from_user_4x_cont(to, from, ret, \ | |
| 256 | COPY \ | |
| 257 | "4: move.d [%1+],$acr\n" \ | |
| 258 | " move.d $acr,[%0+]\n", \ | |
| 259 | FIXUP \ | |
| 260 | "5: addq 4,%2\n" \ | |
| 261 | " clear.d [%0+]\n", \ | |
| 262 | TENTRY \ | |
| 263 | " .dword 4b,5b\n") | |
| 264 | ||
| 265 | #define __asm_copy_from_user_8(to, from, ret) \ | |
| 266 | __asm_copy_from_user_8x_cont(to, from, ret, "", "", "") | |
| 267 | ||
| 268 | #define __asm_copy_from_user_9(to, from, ret) \ | |
| 269 | __asm_copy_from_user_8x_cont(to, from, ret, \ | |
| 270 | "6: move.b [%1+],$acr\n" \ | |
| 271 | " move.b $acr,[%0+]\n", \ | |
| 272 | "7: addq 1,%2\n" \ | |
| 273 | " clear.b [%0+]\n", \ | |
| 274 | " .dword 6b,7b\n") | |
| 275 | ||
| 276 | #define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 277 | __asm_copy_from_user_8x_cont(to, from, ret, \ | |
| 278 | COPY \ | |
| 279 | "6: move.w [%1+],$acr\n" \ | |
| 280 | " move.w $acr,[%0+]\n", \ | |
| 281 | FIXUP \ | |
| 282 | "7: addq 2,%2\n" \ | |
| 283 | " clear.w [%0+]\n", \ | |
| 284 | TENTRY \ | |
| 285 | " .dword 6b,7b\n") | |
| 286 | ||
| 287 | #define __asm_copy_from_user_10(to, from, ret) \ | |
| 288 | __asm_copy_from_user_10x_cont(to, from, ret, "", "", "") | |
| 289 | ||
| 290 | #define __asm_copy_from_user_11(to, from, ret) \ | |
| 291 | __asm_copy_from_user_10x_cont(to, from, ret, \ | |
| 292 | "8: move.b [%1+],$acr\n" \ | |
| 293 | " move.b $acr,[%0+]\n", \ | |
| 294 | "9: addq 1,%2\n" \ | |
| 295 | " clear.b [%0+]\n", \ | |
| 296 | " .dword 8b,9b\n") | |
| 297 | ||
| 298 | #define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 299 | __asm_copy_from_user_8x_cont(to, from, ret, \ | |
| 300 | COPY \ | |
| 301 | "6: move.d [%1+],$acr\n" \ | |
| 302 | " move.d $acr,[%0+]\n", \ | |
| 303 | FIXUP \ | |
| 304 | "7: addq 4,%2\n" \ | |
| 305 | " clear.d [%0+]\n", \ | |
| 306 | TENTRY \ | |
| 307 | " .dword 6b,7b\n") | |
| 308 | ||
| 309 | #define __asm_copy_from_user_12(to, from, ret) \ | |
| 310 | __asm_copy_from_user_12x_cont(to, from, ret, "", "", "") | |
| 311 | ||
| 312 | #define __asm_copy_from_user_13(to, from, ret) \ | |
| 313 | __asm_copy_from_user_12x_cont(to, from, ret, \ | |
| 314 | "8: move.b [%1+],$acr\n" \ | |
| 315 | " move.b $acr,[%0+]\n", \ | |
| 316 | "9: addq 1,%2\n" \ | |
| 317 | " clear.b [%0+]\n", \ | |
| 318 | " .dword 8b,9b\n") | |
| 319 | ||
| 320 | #define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 321 | __asm_copy_from_user_12x_cont(to, from, ret, \ | |
| 322 | COPY \ | |
| 323 | "8: move.w [%1+],$acr\n" \ | |
| 324 | " move.w $acr,[%0+]\n", \ | |
| 325 | FIXUP \ | |
| 326 | "9: addq 2,%2\n" \ | |
| 327 | " clear.w [%0+]\n", \ | |
| 328 | TENTRY \ | |
| 329 | " .dword 8b,9b\n") | |
| 330 | ||
| 331 | #define __asm_copy_from_user_14(to, from, ret) \ | |
| 332 | __asm_copy_from_user_14x_cont(to, from, ret, "", "", "") | |
| 333 | ||
| 334 | #define __asm_copy_from_user_15(to, from, ret) \ | |
| 335 | __asm_copy_from_user_14x_cont(to, from, ret, \ | |
| 336 | "10: move.b [%1+],$acr\n" \ | |
| 337 | " move.b $acr,[%0+]\n", \ | |
| 338 | "11: addq 1,%2\n" \ | |
| 339 | " clear.b [%0+]\n", \ | |
| 340 | " .dword 10b,11b\n") | |
| 341 | ||
| 342 | #define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 343 | __asm_copy_from_user_12x_cont(to, from, ret, \ | |
| 344 | COPY \ | |
| 345 | "8: move.d [%1+],$acr\n" \ | |
| 346 | " move.d $acr,[%0+]\n", \ | |
| 347 | FIXUP \ | |
| 348 | "9: addq 4,%2\n" \ | |
| 349 | " clear.d [%0+]\n", \ | |
| 350 | TENTRY \ | |
| 351 | " .dword 8b,9b\n") | |
| 352 | ||
| 353 | #define __asm_copy_from_user_16(to, from, ret) \ | |
| 354 | __asm_copy_from_user_16x_cont(to, from, ret, "", "", "") | |
| 355 | ||
| 356 | #define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 357 | __asm_copy_from_user_16x_cont(to, from, ret, \ | |
| 358 | COPY \ | |
| 359 | "10: move.d [%1+],$acr\n" \ | |
| 360 | " move.d $acr,[%0+]\n", \ | |
| 361 | FIXUP \ | |
| 362 | "11: addq 4,%2\n" \ | |
| 363 | " clear.d [%0+]\n", \ | |
| 364 | TENTRY \ | |
| 365 | " .dword 10b,11b\n") | |
| 366 | ||
| 367 | #define __asm_copy_from_user_20(to, from, ret) \ | |
| 368 | __asm_copy_from_user_20x_cont(to, from, ret, "", "", "") | |
| 369 | ||
| 370 | #define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 371 | __asm_copy_from_user_20x_cont(to, from, ret, \ | |
| 372 | COPY \ | |
| 373 | "12: move.d [%1+],$acr\n" \ | |
| 374 | " move.d $acr,[%0+]\n", \ | |
| 375 | FIXUP \ | |
| 376 | "13: addq 4,%2\n" \ | |
| 377 | " clear.d [%0+]\n", \ | |
| 378 | TENTRY \ | |
| 379 | " .dword 12b,13b\n") | |
| 380 | ||
| 381 | #define __asm_copy_from_user_24(to, from, ret) \ | |
| 382 | __asm_copy_from_user_24x_cont(to, from, ret, "", "", "") | |
| 383 | ||
| 384 | /* And now, the to-user ones. */ | |
| 385 | ||
| 386 | #define __asm_copy_to_user_1(to, from, ret) \ | |
| 387 | __asm_copy_user_cont(to, from, ret, \ | |
| 388 | " move.b [%1+],$acr\n" \ | |
| 389 | "2: move.b $acr,[%0+]\n", \ | |
| 390 | "3: jump 1b\n" \ | |
| 391 | " addq 1,%2\n", \ | |
| 392 | " .dword 2b,3b\n") | |
| 393 | ||
| 394 | #define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 395 | __asm_copy_user_cont(to, from, ret, \ | |
| 396 | COPY \ | |
| 397 | " move.w [%1+],$acr\n" \ | |
| 398 | "2: move.w $acr,[%0+]\n", \ | |
| 399 | FIXUP \ | |
| 400 | "3: jump 1b\n" \ | |
| 401 | " addq 2,%2\n", \ | |
| 402 | TENTRY \ | |
| 403 | " .dword 2b,3b\n") | |
| 404 | ||
| 405 | #define __asm_copy_to_user_2(to, from, ret) \ | |
| 406 | __asm_copy_to_user_2x_cont(to, from, ret, "", "", "") | |
| 407 | ||
| 408 | #define __asm_copy_to_user_3(to, from, ret) \ | |
| 409 | __asm_copy_to_user_2x_cont(to, from, ret, \ | |
| 410 | " move.b [%1+],$acr\n" \ | |
| 411 | "4: move.b $acr,[%0+]\n", \ | |
| 412 | "5: addq 1,%2\n", \ | |
| 413 | " .dword 4b,5b\n") | |
| 414 | ||
| 415 | #define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 416 | __asm_copy_user_cont(to, from, ret, \ | |
| 417 | COPY \ | |
| 418 | " move.d [%1+],$acr\n" \ | |
| 419 | "2: move.d $acr,[%0+]\n", \ | |
| 420 | FIXUP \ | |
| 421 | "3: jump 1b\n" \ | |
| 422 | " addq 4,%2\n", \ | |
| 423 | TENTRY \ | |
| 424 | " .dword 2b,3b\n") | |
| 425 | ||
| 426 | #define __asm_copy_to_user_4(to, from, ret) \ | |
| 427 | __asm_copy_to_user_4x_cont(to, from, ret, "", "", "") | |
| 428 | ||
| 429 | #define __asm_copy_to_user_5(to, from, ret) \ | |
| 430 | __asm_copy_to_user_4x_cont(to, from, ret, \ | |
| 431 | " move.b [%1+],$acr\n" \ | |
| 432 | "4: move.b $acr,[%0+]\n", \ | |
| 433 | "5: addq 1,%2\n", \ | |
| 434 | " .dword 4b,5b\n") | |
| 435 | ||
| 436 | #define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 437 | __asm_copy_to_user_4x_cont(to, from, ret, \ | |
| 438 | COPY \ | |
| 439 | " move.w [%1+],$acr\n" \ | |
| 440 | "4: move.w $acr,[%0+]\n", \ | |
| 441 | FIXUP \ | |
| 442 | "5: addq 2,%2\n", \ | |
| 443 | TENTRY \ | |
| 444 | " .dword 4b,5b\n") | |
| 445 | ||
| 446 | #define __asm_copy_to_user_6(to, from, ret) \ | |
| 447 | __asm_copy_to_user_6x_cont(to, from, ret, "", "", "") | |
| 448 | ||
| 449 | #define __asm_copy_to_user_7(to, from, ret) \ | |
| 450 | __asm_copy_to_user_6x_cont(to, from, ret, \ | |
| 451 | " move.b [%1+],$acr\n" \ | |
| 452 | "6: move.b $acr,[%0+]\n", \ | |
| 453 | "7: addq 1,%2\n", \ | |
| 454 | " .dword 6b,7b\n") | |
| 455 | ||
| 456 | #define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 457 | __asm_copy_to_user_4x_cont(to, from, ret, \ | |
| 458 | COPY \ | |
| 459 | " move.d [%1+],$acr\n" \ | |
| 460 | "4: move.d $acr,[%0+]\n", \ | |
| 461 | FIXUP \ | |
| 462 | "5: addq 4,%2\n", \ | |
| 463 | TENTRY \ | |
| 464 | " .dword 4b,5b\n") | |
| 465 | ||
| 466 | #define __asm_copy_to_user_8(to, from, ret) \ | |
| 467 | __asm_copy_to_user_8x_cont(to, from, ret, "", "", "") | |
| 468 | ||
| 469 | #define __asm_copy_to_user_9(to, from, ret) \ | |
| 470 | __asm_copy_to_user_8x_cont(to, from, ret, \ | |
| 471 | " move.b [%1+],$acr\n" \ | |
| 472 | "6: move.b $acr,[%0+]\n", \ | |
| 473 | "7: addq 1,%2\n", \ | |
| 474 | " .dword 6b,7b\n") | |
| 475 | ||
| 476 | #define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 477 | __asm_copy_to_user_8x_cont(to, from, ret, \ | |
| 478 | COPY \ | |
| 479 | " move.w [%1+],$acr\n" \ | |
| 480 | "6: move.w $acr,[%0+]\n", \ | |
| 481 | FIXUP \ | |
| 482 | "7: addq 2,%2\n", \ | |
| 483 | TENTRY \ | |
| 484 | " .dword 6b,7b\n") | |
| 485 | ||
| 486 | #define __asm_copy_to_user_10(to, from, ret) \ | |
| 487 | __asm_copy_to_user_10x_cont(to, from, ret, "", "", "") | |
| 488 | ||
| 489 | #define __asm_copy_to_user_11(to, from, ret) \ | |
| 490 | __asm_copy_to_user_10x_cont(to, from, ret, \ | |
| 491 | " move.b [%1+],$acr\n" \ | |
| 492 | "8: move.b $acr,[%0+]\n", \ | |
| 493 | "9: addq 1,%2\n", \ | |
| 494 | " .dword 8b,9b\n") | |
| 495 | ||
| 496 | #define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 497 | __asm_copy_to_user_8x_cont(to, from, ret, \ | |
| 498 | COPY \ | |
| 499 | " move.d [%1+],$acr\n" \ | |
| 500 | "6: move.d $acr,[%0+]\n", \ | |
| 501 | FIXUP \ | |
| 502 | "7: addq 4,%2\n", \ | |
| 503 | TENTRY \ | |
| 504 | " .dword 6b,7b\n") | |
| 505 | ||
| 506 | #define __asm_copy_to_user_12(to, from, ret) \ | |
| 507 | __asm_copy_to_user_12x_cont(to, from, ret, "", "", "") | |
| 508 | ||
| 509 | #define __asm_copy_to_user_13(to, from, ret) \ | |
| 510 | __asm_copy_to_user_12x_cont(to, from, ret, \ | |
| 511 | " move.b [%1+],$acr\n" \ | |
| 512 | "8: move.b $acr,[%0+]\n", \ | |
| 513 | "9: addq 1,%2\n", \ | |
| 514 | " .dword 8b,9b\n") | |
| 515 | ||
| 516 | #define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 517 | __asm_copy_to_user_12x_cont(to, from, ret, \ | |
| 518 | COPY \ | |
| 519 | " move.w [%1+],$acr\n" \ | |
| 520 | "8: move.w $acr,[%0+]\n", \ | |
| 521 | FIXUP \ | |
| 522 | "9: addq 2,%2\n", \ | |
| 523 | TENTRY \ | |
| 524 | " .dword 8b,9b\n") | |
| 525 | ||
| 526 | #define __asm_copy_to_user_14(to, from, ret) \ | |
| 527 | __asm_copy_to_user_14x_cont(to, from, ret, "", "", "") | |
| 528 | ||
| 529 | #define __asm_copy_to_user_15(to, from, ret) \ | |
| 530 | __asm_copy_to_user_14x_cont(to, from, ret, \ | |
| 531 | " move.b [%1+],$acr\n" \ | |
| 532 | "10: move.b $acr,[%0+]\n", \ | |
| 533 | "11: addq 1,%2\n", \ | |
| 534 | " .dword 10b,11b\n") | |
| 535 | ||
| 536 | #define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 537 | __asm_copy_to_user_12x_cont(to, from, ret, \ | |
| 538 | COPY \ | |
| 539 | " move.d [%1+],$acr\n" \ | |
| 540 | "8: move.d $acr,[%0+]\n", \ | |
| 541 | FIXUP \ | |
| 542 | "9: addq 4,%2\n", \ | |
| 543 | TENTRY \ | |
| 544 | " .dword 8b,9b\n") | |
| 545 | ||
| 546 | #define __asm_copy_to_user_16(to, from, ret) \ | |
| 547 | __asm_copy_to_user_16x_cont(to, from, ret, "", "", "") | |
| 548 | ||
| 549 | #define __asm_copy_to_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 550 | __asm_copy_to_user_16x_cont(to, from, ret, \ | |
| 551 | COPY \ | |
| 552 | " move.d [%1+],$acr\n" \ | |
| 553 | "10: move.d $acr,[%0+]\n", \ | |
| 554 | FIXUP \ | |
| 555 | "11: addq 4,%2\n", \ | |
| 556 | TENTRY \ | |
| 557 | " .dword 10b,11b\n") | |
| 558 | ||
| 559 | #define __asm_copy_to_user_20(to, from, ret) \ | |
| 560 | __asm_copy_to_user_20x_cont(to, from, ret, "", "", "") | |
| 561 | ||
| 562 | #define __asm_copy_to_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY) \ | |
| 563 | __asm_copy_to_user_20x_cont(to, from, ret, \ | |
| 564 | COPY \ | |
| 565 | " move.d [%1+],$acr\n" \ | |
| 566 | "12: move.d $acr,[%0+]\n", \ | |
| 567 | FIXUP \ | |
| 568 | "13: addq 4,%2\n", \ | |
| 569 | TENTRY \ | |
| 570 | " .dword 12b,13b\n") | |
| 571 | ||
| 572 | #define __asm_copy_to_user_24(to, from, ret) \ | |
| 573 | __asm_copy_to_user_24x_cont(to, from, ret, "", "", "") | |
| 574 | ||
| 575 | /* Define a few clearing asms with exception handlers. */ | |
| 576 | ||
| 577 | /* This frame-asm is like the __asm_copy_user_cont one, but has one less | |
| 578 | input. */ | |
| 579 | ||
| 580 | #define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 581 | __asm__ __volatile__ ( \ | |
| 582 | CLEAR \ | |
| 583 | "1:\n" \ | |
| 584 | " .section .fixup,\"ax\"\n" \ | |
| 585 | FIXUP \ | |
| 586 | " .previous\n" \ | |
| 587 | " .section __ex_table,\"a\"\n" \ | |
| 588 | TENTRY \ | |
| 589 | " .previous" \ | |
| 590 | : "=b" (to), "=r" (ret) \ | |
| 591 | : "0" (to), "1" (ret) \ | |
| 592 | : "memory") | |
| 593 | ||
| 594 | #define __asm_clear_1(to, ret) \ | |
| 595 | __asm_clear(to, ret, \ | |
| 596 | "2: clear.b [%0+]\n", \ | |
| 597 | "3: jump 1b\n" \ | |
| 598 | " addq 1,%1\n", \ | |
| 599 | " .dword 2b,3b\n") | |
| 600 | ||
| 601 | #define __asm_clear_2(to, ret) \ | |
| 602 | __asm_clear(to, ret, \ | |
| 603 | "2: clear.w [%0+]\n", \ | |
| 604 | "3: jump 1b\n" \ | |
| 605 | " addq 2,%1\n", \ | |
| 606 | " .dword 2b,3b\n") | |
| 607 | ||
| 608 | #define __asm_clear_3(to, ret) \ | |
| 609 | __asm_clear(to, ret, \ | |
| 610 | "2: clear.w [%0+]\n" \ | |
| 611 | "3: clear.b [%0+]\n", \ | |
| 612 | "4: addq 2,%1\n" \ | |
| 613 | "5: jump 1b\n" \ | |
| 614 | " addq 1,%1\n", \ | |
| 615 | " .dword 2b,4b\n" \ | |
| 616 | " .dword 3b,5b\n") | |
| 617 | ||
| 618 | #define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 619 | __asm_clear(to, ret, \ | |
| 620 | CLEAR \ | |
| 621 | "2: clear.d [%0+]\n", \ | |
| 622 | FIXUP \ | |
| 623 | "3: jump 1b\n" \ | |
| 624 | " addq 4,%1\n", \ | |
| 625 | TENTRY \ | |
| 626 | " .dword 2b,3b\n") | |
| 627 | ||
| 628 | #define __asm_clear_4(to, ret) \ | |
| 629 | __asm_clear_4x_cont(to, ret, "", "", "") | |
| 630 | ||
| 631 | #define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 632 | __asm_clear_4x_cont(to, ret, \ | |
| 633 | CLEAR \ | |
| 634 | "4: clear.d [%0+]\n", \ | |
| 635 | FIXUP \ | |
| 636 | "5: addq 4,%1\n", \ | |
| 637 | TENTRY \ | |
| 638 | " .dword 4b,5b\n") | |
| 639 | ||
| 640 | #define __asm_clear_8(to, ret) \ | |
| 641 | __asm_clear_8x_cont(to, ret, "", "", "") | |
| 642 | ||
| 643 | #define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 644 | __asm_clear_8x_cont(to, ret, \ | |
| 645 | CLEAR \ | |
| 646 | "6: clear.d [%0+]\n", \ | |
| 647 | FIXUP \ | |
| 648 | "7: addq 4,%1\n", \ | |
| 649 | TENTRY \ | |
| 650 | " .dword 6b,7b\n") | |
| 651 | ||
| 652 | #define __asm_clear_12(to, ret) \ | |
| 653 | __asm_clear_12x_cont(to, ret, "", "", "") | |
| 654 | ||
| 655 | #define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 656 | __asm_clear_12x_cont(to, ret, \ | |
| 657 | CLEAR \ | |
| 658 | "8: clear.d [%0+]\n", \ | |
| 659 | FIXUP \ | |
| 660 | "9: addq 4,%1\n", \ | |
| 661 | TENTRY \ | |
| 662 | " .dword 8b,9b\n") | |
| 663 | ||
| 664 | #define __asm_clear_16(to, ret) \ | |
| 665 | __asm_clear_16x_cont(to, ret, "", "", "") | |
| 666 | ||
| 667 | #define __asm_clear_20x_cont(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 668 | __asm_clear_16x_cont(to, ret, \ | |
| 669 | CLEAR \ | |
| 670 | "10: clear.d [%0+]\n", \ | |
| 671 | FIXUP \ | |
| 672 | "11: addq 4,%1\n", \ | |
| 673 | TENTRY \ | |
| 674 | " .dword 10b,11b\n") | |
| 675 | ||
| 676 | #define __asm_clear_20(to, ret) \ | |
| 677 | __asm_clear_20x_cont(to, ret, "", "", "") | |
| 678 | ||
| 679 | #define __asm_clear_24x_cont(to, ret, CLEAR, FIXUP, TENTRY) \ | |
| 680 | __asm_clear_20x_cont(to, ret, \ | |
| 681 | CLEAR \ | |
| 682 | "12: clear.d [%0+]\n", \ | |
| 683 | FIXUP \ | |
| 684 | "13: addq 4,%1\n", \ | |
| 685 | TENTRY \ | |
| 686 | " .dword 12b,13b\n") | |
| 687 | ||
| 688 | #define __asm_clear_24(to, ret) \ | |
| 689 | __asm_clear_24x_cont(to, ret, "", "", "") | |
| 690 | ||
| 691 | /* | |
| 692 | * Return the size of a string (including the ending 0) | |
| 693 | * | |
| 694 | * Return length of string in userspace including terminating 0 | |
| 695 | * or 0 for error. Return a value greater than N if too long. | |
| 696 | */ | |
| 697 | ||
| d9b5444e | 698 | static inline long |
| 51533b61 MS |
699 | strnlen_user(const char *s, long n) |
| 700 | { | |
| 701 | long res, tmp1; | |
| 702 | ||
| 703 | if (!access_ok(VERIFY_READ, s, 0)) | |
| 704 | return 0; | |
| 705 | ||
| 706 | /* | |
| 707 | * This code is deduced from: | |
| 708 | * | |
| 709 | * tmp1 = n; | |
| 710 | * while (tmp1-- > 0 && *s++) | |
| 711 | * ; | |
| 712 | * | |
| 713 | * res = n - tmp1; | |
| 714 | * | |
| 715 | * (with tweaks). | |
| 716 | */ | |
| 717 | ||
| 718 | __asm__ __volatile__ ( | |
| 719 | " move.d %1,$acr\n" | |
| 720 | " cmpq 0,$acr\n" | |
| 721 | "0:\n" | |
| 722 | " ble 1f\n" | |
| 723 | " subq 1,$acr\n" | |
| 724 | ||
| 725 | "4: test.b [%0+]\n" | |
| 726 | " bne 0b\n" | |
| 727 | " cmpq 0,$acr\n" | |
| 728 | "1:\n" | |
| 729 | " move.d %1,%0\n" | |
| 730 | " sub.d $acr,%0\n" | |
| 731 | "2:\n" | |
| 732 | " .section .fixup,\"ax\"\n" | |
| 733 | ||
| 734 | "3: jump 2b\n" | |
| 735 | " clear.d %0\n" | |
| 736 | ||
| 737 | " .previous\n" | |
| 738 | " .section __ex_table,\"a\"\n" | |
| 739 | " .dword 4b,3b\n" | |
| 740 | " .previous\n" | |
| 741 | : "=r" (res), "=r" (tmp1) | |
| 742 | : "0" (s), "1" (n) | |
| 743 | : "acr"); | |
| 744 | ||
| 745 | return res; | |
| 746 | } | |
| 747 | ||
| 748 | #endif |