| 1 | /* |
| 2 | * lttng-filter-validator.c |
| 3 | * |
| 4 | * LTTng UST filter bytecode validator. |
| 5 | * |
| 6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * This library is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; only |
| 11 | * version 2.1 of the License. |
| 12 | * |
| 13 | * This library is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with this library; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include "lttng-filter.h" |
| 24 | |
| 25 | static |
| 26 | int bin_op_compare_check(struct vreg reg[NR_REG], const char *str) |
| 27 | { |
| 28 | switch (reg[REG_R0].type) { |
| 29 | default: |
| 30 | goto error_unknown; |
| 31 | |
| 32 | case REG_STRING: |
| 33 | switch (reg[REG_R1].type) { |
| 34 | default: |
| 35 | goto error_unknown; |
| 36 | |
| 37 | case REG_STRING: |
| 38 | break; |
| 39 | case REG_S64: |
| 40 | case REG_DOUBLE: |
| 41 | goto error_mismatch; |
| 42 | } |
| 43 | break; |
| 44 | case REG_S64: |
| 45 | case REG_DOUBLE: |
| 46 | switch (reg[REG_R1].type) { |
| 47 | default: |
| 48 | goto error_unknown; |
| 49 | |
| 50 | case REG_STRING: |
| 51 | goto error_mismatch; |
| 52 | |
| 53 | case REG_S64: |
| 54 | case REG_DOUBLE: |
| 55 | break; |
| 56 | } |
| 57 | break; |
| 58 | } |
| 59 | return 0; |
| 60 | |
| 61 | error_unknown: |
| 62 | |
| 63 | return -EINVAL; |
| 64 | error_mismatch: |
| 65 | ERR("type mismatch for '%s' binary operator\n", str); |
| 66 | return -EINVAL; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * Validate bytecode range overflow within the validation pass. |
| 71 | * Called for each instruction encountered. |
| 72 | */ |
| 73 | static |
| 74 | int bytecode_validate_overflow(struct bytecode_runtime *bytecode, |
| 75 | void *start_pc, void *pc) |
| 76 | { |
| 77 | int ret = 0; |
| 78 | |
| 79 | switch (*(filter_opcode_t *) pc) { |
| 80 | case FILTER_OP_UNKNOWN: |
| 81 | default: |
| 82 | { |
| 83 | ERR("unknown bytecode op %u\n", |
| 84 | (unsigned int) *(filter_opcode_t *) pc); |
| 85 | ret = -EINVAL; |
| 86 | break; |
| 87 | } |
| 88 | |
| 89 | case FILTER_OP_RETURN: |
| 90 | { |
| 91 | if (unlikely(pc + sizeof(struct return_op) |
| 92 | > start_pc + bytecode->len)) { |
| 93 | ret = -EINVAL; |
| 94 | } |
| 95 | break; |
| 96 | } |
| 97 | |
| 98 | /* binary */ |
| 99 | case FILTER_OP_MUL: |
| 100 | case FILTER_OP_DIV: |
| 101 | case FILTER_OP_MOD: |
| 102 | case FILTER_OP_PLUS: |
| 103 | case FILTER_OP_MINUS: |
| 104 | case FILTER_OP_RSHIFT: |
| 105 | case FILTER_OP_LSHIFT: |
| 106 | case FILTER_OP_BIN_AND: |
| 107 | case FILTER_OP_BIN_OR: |
| 108 | case FILTER_OP_BIN_XOR: |
| 109 | { |
| 110 | ERR("unsupported bytecode op %u\n", |
| 111 | (unsigned int) *(filter_opcode_t *) pc); |
| 112 | ret = -EINVAL; |
| 113 | break; |
| 114 | } |
| 115 | |
| 116 | case FILTER_OP_EQ: |
| 117 | case FILTER_OP_NE: |
| 118 | case FILTER_OP_GT: |
| 119 | case FILTER_OP_LT: |
| 120 | case FILTER_OP_GE: |
| 121 | case FILTER_OP_LE: |
| 122 | case FILTER_OP_EQ_STRING: |
| 123 | case FILTER_OP_NE_STRING: |
| 124 | case FILTER_OP_GT_STRING: |
| 125 | case FILTER_OP_LT_STRING: |
| 126 | case FILTER_OP_GE_STRING: |
| 127 | case FILTER_OP_LE_STRING: |
| 128 | case FILTER_OP_EQ_S64: |
| 129 | case FILTER_OP_NE_S64: |
| 130 | case FILTER_OP_GT_S64: |
| 131 | case FILTER_OP_LT_S64: |
| 132 | case FILTER_OP_GE_S64: |
| 133 | case FILTER_OP_LE_S64: |
| 134 | case FILTER_OP_EQ_DOUBLE: |
| 135 | case FILTER_OP_NE_DOUBLE: |
| 136 | case FILTER_OP_GT_DOUBLE: |
| 137 | case FILTER_OP_LT_DOUBLE: |
| 138 | case FILTER_OP_GE_DOUBLE: |
| 139 | case FILTER_OP_LE_DOUBLE: |
| 140 | { |
| 141 | if (unlikely(pc + sizeof(struct binary_op) |
| 142 | > start_pc + bytecode->len)) { |
| 143 | ret = -EINVAL; |
| 144 | } |
| 145 | break; |
| 146 | } |
| 147 | |
| 148 | /* unary */ |
| 149 | case FILTER_OP_UNARY_PLUS: |
| 150 | case FILTER_OP_UNARY_MINUS: |
| 151 | case FILTER_OP_UNARY_NOT: |
| 152 | case FILTER_OP_UNARY_PLUS_S64: |
| 153 | case FILTER_OP_UNARY_MINUS_S64: |
| 154 | case FILTER_OP_UNARY_NOT_S64: |
| 155 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 156 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 157 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 158 | { |
| 159 | if (unlikely(pc + sizeof(struct unary_op) |
| 160 | > start_pc + bytecode->len)) { |
| 161 | ret = -EINVAL; |
| 162 | } |
| 163 | break; |
| 164 | } |
| 165 | |
| 166 | /* logical */ |
| 167 | case FILTER_OP_AND: |
| 168 | case FILTER_OP_OR: |
| 169 | { |
| 170 | if (unlikely(pc + sizeof(struct logical_op) |
| 171 | > start_pc + bytecode->len)) { |
| 172 | ret = -EINVAL; |
| 173 | } |
| 174 | break; |
| 175 | } |
| 176 | |
| 177 | /* load */ |
| 178 | case FILTER_OP_LOAD_FIELD_REF: |
| 179 | { |
| 180 | ERR("Unknown field ref type\n"); |
| 181 | ret = -EINVAL; |
| 182 | break; |
| 183 | } |
| 184 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 185 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 186 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 187 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 188 | { |
| 189 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct field_ref) |
| 190 | > start_pc + bytecode->len)) { |
| 191 | ret = -EINVAL; |
| 192 | } |
| 193 | break; |
| 194 | } |
| 195 | |
| 196 | case FILTER_OP_LOAD_STRING: |
| 197 | { |
| 198 | struct load_op *insn = (struct load_op *) pc; |
| 199 | uint32_t str_len, maxlen; |
| 200 | |
| 201 | if (unlikely(pc + sizeof(struct load_op) |
| 202 | > start_pc + bytecode->len)) { |
| 203 | ret = -EINVAL; |
| 204 | break; |
| 205 | } |
| 206 | |
| 207 | maxlen = start_pc + bytecode->len - pc - sizeof(struct load_op); |
| 208 | str_len = strnlen(insn->data, maxlen); |
| 209 | if (unlikely(str_len >= maxlen)) { |
| 210 | /* Final '\0' not found within range */ |
| 211 | ret = -EINVAL; |
| 212 | } |
| 213 | break; |
| 214 | } |
| 215 | |
| 216 | case FILTER_OP_LOAD_S64: |
| 217 | { |
| 218 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_numeric) |
| 219 | > start_pc + bytecode->len)) { |
| 220 | ret = -EINVAL; |
| 221 | } |
| 222 | break; |
| 223 | } |
| 224 | |
| 225 | case FILTER_OP_LOAD_DOUBLE: |
| 226 | { |
| 227 | if (unlikely(pc + sizeof(struct load_op) + sizeof(struct literal_double) |
| 228 | > start_pc + bytecode->len)) { |
| 229 | ret = -EINVAL; |
| 230 | } |
| 231 | break; |
| 232 | } |
| 233 | |
| 234 | case FILTER_OP_CAST_TO_S64: |
| 235 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 236 | case FILTER_OP_CAST_NOP: |
| 237 | { |
| 238 | if (unlikely(pc + sizeof(struct cast_op) |
| 239 | > start_pc + bytecode->len)) { |
| 240 | ret = -EINVAL; |
| 241 | } |
| 242 | break; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | return ret; |
| 247 | } |
| 248 | |
| 249 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) |
| 250 | { |
| 251 | void *pc, *next_pc, *start_pc; |
| 252 | int ret = -EINVAL; |
| 253 | struct vreg reg[NR_REG]; |
| 254 | int i; |
| 255 | |
| 256 | for (i = 0; i < NR_REG; i++) { |
| 257 | reg[i].type = REG_TYPE_UNKNOWN; |
| 258 | reg[i].literal = 0; |
| 259 | } |
| 260 | |
| 261 | start_pc = &bytecode->data[0]; |
| 262 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; |
| 263 | pc = next_pc) { |
| 264 | if (bytecode_validate_overflow(bytecode, start_pc, pc) != 0) { |
| 265 | ERR("filter bytecode overflow\n"); |
| 266 | ret = -EINVAL; |
| 267 | goto end; |
| 268 | } |
| 269 | dbg_printf("Validating op %s (%u)\n", |
| 270 | print_op((unsigned int) *(filter_opcode_t *) pc), |
| 271 | (unsigned int) *(filter_opcode_t *) pc); |
| 272 | switch (*(filter_opcode_t *) pc) { |
| 273 | case FILTER_OP_UNKNOWN: |
| 274 | default: |
| 275 | ERR("unknown bytecode op %u\n", |
| 276 | (unsigned int) *(filter_opcode_t *) pc); |
| 277 | ret = -EINVAL; |
| 278 | goto end; |
| 279 | |
| 280 | case FILTER_OP_RETURN: |
| 281 | ret = 0; |
| 282 | goto end; |
| 283 | |
| 284 | /* binary */ |
| 285 | case FILTER_OP_MUL: |
| 286 | case FILTER_OP_DIV: |
| 287 | case FILTER_OP_MOD: |
| 288 | case FILTER_OP_PLUS: |
| 289 | case FILTER_OP_MINUS: |
| 290 | case FILTER_OP_RSHIFT: |
| 291 | case FILTER_OP_LSHIFT: |
| 292 | case FILTER_OP_BIN_AND: |
| 293 | case FILTER_OP_BIN_OR: |
| 294 | case FILTER_OP_BIN_XOR: |
| 295 | ERR("unsupported bytecode op %u\n", |
| 296 | (unsigned int) *(filter_opcode_t *) pc); |
| 297 | ret = -EINVAL; |
| 298 | goto end; |
| 299 | |
| 300 | case FILTER_OP_EQ: |
| 301 | { |
| 302 | ret = bin_op_compare_check(reg, "=="); |
| 303 | if (ret) |
| 304 | goto end; |
| 305 | reg[REG_R0].type = REG_S64; |
| 306 | next_pc += sizeof(struct binary_op); |
| 307 | break; |
| 308 | } |
| 309 | case FILTER_OP_NE: |
| 310 | { |
| 311 | ret = bin_op_compare_check(reg, "!="); |
| 312 | if (ret) |
| 313 | goto end; |
| 314 | reg[REG_R0].type = REG_S64; |
| 315 | next_pc += sizeof(struct binary_op); |
| 316 | break; |
| 317 | } |
| 318 | case FILTER_OP_GT: |
| 319 | { |
| 320 | ret = bin_op_compare_check(reg, ">"); |
| 321 | if (ret) |
| 322 | goto end; |
| 323 | reg[REG_R0].type = REG_S64; |
| 324 | next_pc += sizeof(struct binary_op); |
| 325 | break; |
| 326 | } |
| 327 | case FILTER_OP_LT: |
| 328 | { |
| 329 | ret = bin_op_compare_check(reg, "<"); |
| 330 | if (ret) |
| 331 | goto end; |
| 332 | reg[REG_R0].type = REG_S64; |
| 333 | next_pc += sizeof(struct binary_op); |
| 334 | break; |
| 335 | } |
| 336 | case FILTER_OP_GE: |
| 337 | { |
| 338 | ret = bin_op_compare_check(reg, ">="); |
| 339 | if (ret) |
| 340 | goto end; |
| 341 | reg[REG_R0].type = REG_S64; |
| 342 | next_pc += sizeof(struct binary_op); |
| 343 | break; |
| 344 | } |
| 345 | case FILTER_OP_LE: |
| 346 | { |
| 347 | ret = bin_op_compare_check(reg, "<="); |
| 348 | if (ret) |
| 349 | goto end; |
| 350 | reg[REG_R0].type = REG_S64; |
| 351 | next_pc += sizeof(struct binary_op); |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | case FILTER_OP_EQ_STRING: |
| 356 | case FILTER_OP_NE_STRING: |
| 357 | case FILTER_OP_GT_STRING: |
| 358 | case FILTER_OP_LT_STRING: |
| 359 | case FILTER_OP_GE_STRING: |
| 360 | case FILTER_OP_LE_STRING: |
| 361 | { |
| 362 | if (reg[REG_R0].type != REG_STRING |
| 363 | || reg[REG_R1].type != REG_STRING) { |
| 364 | ERR("Unexpected register type for string comparator\n"); |
| 365 | ret = -EINVAL; |
| 366 | goto end; |
| 367 | } |
| 368 | reg[REG_R0].type = REG_S64; |
| 369 | next_pc += sizeof(struct binary_op); |
| 370 | break; |
| 371 | } |
| 372 | |
| 373 | case FILTER_OP_EQ_S64: |
| 374 | case FILTER_OP_NE_S64: |
| 375 | case FILTER_OP_GT_S64: |
| 376 | case FILTER_OP_LT_S64: |
| 377 | case FILTER_OP_GE_S64: |
| 378 | case FILTER_OP_LE_S64: |
| 379 | { |
| 380 | if (reg[REG_R0].type != REG_S64 |
| 381 | || reg[REG_R1].type != REG_S64) { |
| 382 | ERR("Unexpected register type for s64 comparator\n"); |
| 383 | ret = -EINVAL; |
| 384 | goto end; |
| 385 | } |
| 386 | reg[REG_R0].type = REG_S64; |
| 387 | next_pc += sizeof(struct binary_op); |
| 388 | break; |
| 389 | } |
| 390 | |
| 391 | case FILTER_OP_EQ_DOUBLE: |
| 392 | case FILTER_OP_NE_DOUBLE: |
| 393 | case FILTER_OP_GT_DOUBLE: |
| 394 | case FILTER_OP_LT_DOUBLE: |
| 395 | case FILTER_OP_GE_DOUBLE: |
| 396 | case FILTER_OP_LE_DOUBLE: |
| 397 | { |
| 398 | if ((reg[REG_R0].type != REG_DOUBLE && reg[REG_R0].type != REG_S64) |
| 399 | || (reg[REG_R1].type != REG_DOUBLE && reg[REG_R1].type != REG_S64)) { |
| 400 | ERR("Unexpected register type for double comparator\n"); |
| 401 | ret = -EINVAL; |
| 402 | goto end; |
| 403 | } |
| 404 | if (reg[REG_R0].type != REG_DOUBLE && reg[REG_R1].type != REG_DOUBLE) { |
| 405 | ERR("Double operator should have at least one double register\n"); |
| 406 | ret = -EINVAL; |
| 407 | goto end; |
| 408 | } |
| 409 | reg[REG_R0].type = REG_DOUBLE; |
| 410 | next_pc += sizeof(struct binary_op); |
| 411 | break; |
| 412 | } |
| 413 | |
| 414 | /* unary */ |
| 415 | case FILTER_OP_UNARY_PLUS: |
| 416 | case FILTER_OP_UNARY_MINUS: |
| 417 | case FILTER_OP_UNARY_NOT: |
| 418 | { |
| 419 | struct unary_op *insn = (struct unary_op *) pc; |
| 420 | |
| 421 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 422 | ERR("invalid register %u\n", |
| 423 | (unsigned int) insn->reg); |
| 424 | ret = -EINVAL; |
| 425 | goto end; |
| 426 | } |
| 427 | switch (reg[insn->reg].type) { |
| 428 | default: |
| 429 | ERR("unknown register type\n"); |
| 430 | ret = -EINVAL; |
| 431 | goto end; |
| 432 | |
| 433 | case REG_STRING: |
| 434 | ERR("Unary op can only be applied to numeric or floating point registers\n"); |
| 435 | ret = -EINVAL; |
| 436 | goto end; |
| 437 | case REG_S64: |
| 438 | break; |
| 439 | case REG_DOUBLE: |
| 440 | break; |
| 441 | } |
| 442 | next_pc += sizeof(struct unary_op); |
| 443 | break; |
| 444 | } |
| 445 | |
| 446 | case FILTER_OP_UNARY_PLUS_S64: |
| 447 | case FILTER_OP_UNARY_MINUS_S64: |
| 448 | case FILTER_OP_UNARY_NOT_S64: |
| 449 | { |
| 450 | struct unary_op *insn = (struct unary_op *) pc; |
| 451 | |
| 452 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 453 | ERR("invalid register %u\n", |
| 454 | (unsigned int) insn->reg); |
| 455 | ret = -EINVAL; |
| 456 | goto end; |
| 457 | } |
| 458 | if (reg[insn->reg].type != REG_S64) { |
| 459 | ERR("Invalid register type\n"); |
| 460 | ret = -EINVAL; |
| 461 | goto end; |
| 462 | } |
| 463 | next_pc += sizeof(struct unary_op); |
| 464 | break; |
| 465 | } |
| 466 | |
| 467 | case FILTER_OP_UNARY_PLUS_DOUBLE: |
| 468 | case FILTER_OP_UNARY_MINUS_DOUBLE: |
| 469 | case FILTER_OP_UNARY_NOT_DOUBLE: |
| 470 | { |
| 471 | struct unary_op *insn = (struct unary_op *) pc; |
| 472 | |
| 473 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 474 | ERR("invalid register %u\n", |
| 475 | (unsigned int) insn->reg); |
| 476 | ret = -EINVAL; |
| 477 | goto end; |
| 478 | } |
| 479 | if (reg[insn->reg].type != REG_DOUBLE) { |
| 480 | ERR("Invalid register type\n"); |
| 481 | ret = -EINVAL; |
| 482 | goto end; |
| 483 | } |
| 484 | next_pc += sizeof(struct unary_op); |
| 485 | break; |
| 486 | } |
| 487 | |
| 488 | /* logical */ |
| 489 | case FILTER_OP_AND: |
| 490 | case FILTER_OP_OR: |
| 491 | { |
| 492 | struct logical_op *insn = (struct logical_op *) pc; |
| 493 | |
| 494 | if (reg[REG_R0].type != REG_S64) { |
| 495 | ERR("Logical comparator expects S64 register\n"); |
| 496 | ret = -EINVAL; |
| 497 | goto end; |
| 498 | } |
| 499 | |
| 500 | dbg_printf("Validate jumping to bytecode offset %u\n", |
| 501 | (unsigned int) insn->skip_offset); |
| 502 | if (unlikely(start_pc + insn->skip_offset <= pc)) { |
| 503 | ERR("Loops are not allowed in bytecode\n"); |
| 504 | ret = -EINVAL; |
| 505 | goto end; |
| 506 | } |
| 507 | next_pc += sizeof(struct logical_op); |
| 508 | break; |
| 509 | } |
| 510 | |
| 511 | /* load */ |
| 512 | case FILTER_OP_LOAD_FIELD_REF: |
| 513 | { |
| 514 | ERR("Unknown field ref type\n"); |
| 515 | ret = -EINVAL; |
| 516 | goto end; |
| 517 | } |
| 518 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
| 519 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
| 520 | { |
| 521 | struct load_op *insn = (struct load_op *) pc; |
| 522 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 523 | |
| 524 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 525 | ERR("invalid register %u\n", |
| 526 | (unsigned int) insn->reg); |
| 527 | ret = -EINVAL; |
| 528 | goto end; |
| 529 | } |
| 530 | dbg_printf("Validate load field ref offset %u type string\n", |
| 531 | ref->offset); |
| 532 | reg[insn->reg].type = REG_STRING; |
| 533 | reg[insn->reg].literal = 0; |
| 534 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 535 | break; |
| 536 | } |
| 537 | case FILTER_OP_LOAD_FIELD_REF_S64: |
| 538 | { |
| 539 | struct load_op *insn = (struct load_op *) pc; |
| 540 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 541 | |
| 542 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 543 | ERR("invalid register %u\n", |
| 544 | (unsigned int) insn->reg); |
| 545 | ret = -EINVAL; |
| 546 | goto end; |
| 547 | } |
| 548 | dbg_printf("Validate load field ref offset %u type s64\n", |
| 549 | ref->offset); |
| 550 | reg[insn->reg].type = REG_S64; |
| 551 | reg[insn->reg].literal = 0; |
| 552 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 553 | break; |
| 554 | } |
| 555 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: |
| 556 | { |
| 557 | struct load_op *insn = (struct load_op *) pc; |
| 558 | struct field_ref *ref = (struct field_ref *) insn->data; |
| 559 | |
| 560 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 561 | ERR("invalid register %u\n", |
| 562 | (unsigned int) insn->reg); |
| 563 | ret = -EINVAL; |
| 564 | goto end; |
| 565 | } |
| 566 | dbg_printf("Validate load field ref offset %u type double\n", |
| 567 | ref->offset); |
| 568 | reg[insn->reg].type = REG_DOUBLE; |
| 569 | reg[insn->reg].literal = 0; |
| 570 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
| 571 | break; |
| 572 | } |
| 573 | |
| 574 | case FILTER_OP_LOAD_STRING: |
| 575 | { |
| 576 | struct load_op *insn = (struct load_op *) pc; |
| 577 | |
| 578 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 579 | ERR("invalid register %u\n", |
| 580 | (unsigned int) insn->reg); |
| 581 | ret = -EINVAL; |
| 582 | goto end; |
| 583 | } |
| 584 | reg[insn->reg].type = REG_STRING; |
| 585 | reg[insn->reg].literal = 1; |
| 586 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
| 587 | break; |
| 588 | } |
| 589 | |
| 590 | case FILTER_OP_LOAD_S64: |
| 591 | { |
| 592 | struct load_op *insn = (struct load_op *) pc; |
| 593 | |
| 594 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 595 | ERR("invalid register %u\n", |
| 596 | (unsigned int) insn->reg); |
| 597 | ret = -EINVAL; |
| 598 | goto end; |
| 599 | } |
| 600 | reg[insn->reg].type = REG_S64; |
| 601 | reg[insn->reg].literal = 1; |
| 602 | next_pc += sizeof(struct load_op) |
| 603 | + sizeof(struct literal_numeric); |
| 604 | break; |
| 605 | } |
| 606 | |
| 607 | case FILTER_OP_LOAD_DOUBLE: |
| 608 | { |
| 609 | struct load_op *insn = (struct load_op *) pc; |
| 610 | |
| 611 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 612 | ERR("invalid register %u\n", |
| 613 | (unsigned int) insn->reg); |
| 614 | ret = -EINVAL; |
| 615 | goto end; |
| 616 | } |
| 617 | reg[insn->reg].type = REG_DOUBLE; |
| 618 | reg[insn->reg].literal = 1; |
| 619 | next_pc += sizeof(struct load_op) |
| 620 | + sizeof(struct literal_double); |
| 621 | break; |
| 622 | } |
| 623 | |
| 624 | case FILTER_OP_CAST_TO_S64: |
| 625 | case FILTER_OP_CAST_DOUBLE_TO_S64: |
| 626 | { |
| 627 | struct cast_op *insn = (struct cast_op *) pc; |
| 628 | |
| 629 | if (unlikely(insn->reg >= REG_ERROR)) { |
| 630 | ERR("invalid register %u\n", |
| 631 | (unsigned int) insn->reg); |
| 632 | ret = -EINVAL; |
| 633 | goto end; |
| 634 | } |
| 635 | switch (reg[insn->reg].type) { |
| 636 | default: |
| 637 | ERR("unknown register type\n"); |
| 638 | ret = -EINVAL; |
| 639 | goto end; |
| 640 | |
| 641 | case REG_STRING: |
| 642 | ERR("Cast op can only be applied to numeric or floating point registers\n"); |
| 643 | ret = -EINVAL; |
| 644 | goto end; |
| 645 | case REG_S64: |
| 646 | break; |
| 647 | case REG_DOUBLE: |
| 648 | break; |
| 649 | } |
| 650 | if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) { |
| 651 | if (reg[insn->reg].type != REG_DOUBLE) { |
| 652 | ERR("Cast expects double\n"); |
| 653 | ret = -EINVAL; |
| 654 | goto end; |
| 655 | } |
| 656 | } |
| 657 | reg[insn->reg].type = REG_S64; |
| 658 | next_pc += sizeof(struct cast_op); |
| 659 | break; |
| 660 | } |
| 661 | case FILTER_OP_CAST_NOP: |
| 662 | { |
| 663 | next_pc += sizeof(struct cast_op); |
| 664 | break; |
| 665 | } |
| 666 | |
| 667 | } |
| 668 | } |
| 669 | end: |
| 670 | return ret; |
| 671 | } |