Commit | Line | Data |
---|---|---|
2d78951a MD |
1 | /* |
2 | * lttng-filter.c | |
3 | * | |
4 | * LTTng UST filter code. | |
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 <errno.h> | |
24 | #include <stdio.h> | |
25 | #include <helper.h> | |
26 | #include <lttng/ust-events.h> | |
cd54f6d9 MD |
27 | #include <stdint.h> |
28 | #include <errno.h> | |
29 | #include <string.h> | |
30 | #include <inttypes.h> | |
31 | #include <limits.h> | |
b1caea50 | 32 | #include <usterr-signal-safe.h> |
cd54f6d9 MD |
33 | #include "filter-bytecode.h" |
34 | ||
35 | #define NR_REG 2 | |
36 | ||
37 | #ifndef min_t | |
38 | #define min_t(type, a, b) \ | |
39 | ((type) (a) < (type) (b) ? (type) (a) : (type) (b)) | |
40 | #endif | |
41 | ||
42 | #ifndef likely | |
43 | #define likely(x) __builtin_expect(!!(x), 1) | |
44 | #endif | |
45 | ||
46 | #ifndef unlikely | |
47 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
48 | #endif | |
49 | ||
50 | #ifdef DEBUG | |
51 | #define dbg_printf(fmt, args...) printf("[debug bytecode] " fmt, ## args) | |
52 | #else | |
53 | #define dbg_printf(fmt, args...) \ | |
54 | do { \ | |
55 | /* do nothing but check printf format */ \ | |
56 | if (0) \ | |
57 | printf("[debug bytecode] " fmt, ## args); \ | |
58 | } while (0) | |
59 | #endif | |
60 | ||
61 | /* Linked bytecode */ | |
62 | struct bytecode_runtime { | |
63 | uint16_t len; | |
64 | char data[0]; | |
65 | }; | |
66 | ||
9522a886 MD |
67 | enum reg_type { |
68 | REG_S64, | |
69 | REG_DOUBLE, | |
70 | REG_STRING, | |
225b6640 | 71 | REG_TYPE_UNKNOWN, |
9522a886 MD |
72 | }; |
73 | ||
74 | /* Validation registers */ | |
75 | struct vreg { | |
76 | enum reg_type type; | |
77 | int literal; /* is string literal ? */ | |
78 | }; | |
79 | ||
80 | /* Execution registers */ | |
cd54f6d9 | 81 | struct reg { |
9522a886 | 82 | enum reg_type type; |
cd54f6d9 | 83 | int64_t v; |
da6eed25 | 84 | double d; |
cd54f6d9 MD |
85 | |
86 | const char *str; | |
87 | size_t seq_len; | |
88 | int literal; /* is string literal ? */ | |
89 | }; | |
90 | ||
91 | static const char *opnames[] = { | |
92 | [ FILTER_OP_UNKNOWN ] = "UNKNOWN", | |
93 | ||
94 | [ FILTER_OP_RETURN ] = "RETURN", | |
95 | ||
96 | /* binary */ | |
97 | [ FILTER_OP_MUL ] = "MUL", | |
98 | [ FILTER_OP_DIV ] = "DIV", | |
99 | [ FILTER_OP_MOD ] = "MOD", | |
100 | [ FILTER_OP_PLUS ] = "PLUS", | |
101 | [ FILTER_OP_MINUS ] = "MINUS", | |
102 | [ FILTER_OP_RSHIFT ] = "RSHIFT", | |
103 | [ FILTER_OP_LSHIFT ] = "LSHIFT", | |
104 | [ FILTER_OP_BIN_AND ] = "BIN_AND", | |
105 | [ FILTER_OP_BIN_OR ] = "BIN_OR", | |
106 | [ FILTER_OP_BIN_XOR ] = "BIN_XOR", | |
107 | [ FILTER_OP_EQ ] = "EQ", | |
108 | [ FILTER_OP_NE ] = "NE", | |
109 | [ FILTER_OP_GT ] = "GT", | |
110 | [ FILTER_OP_LT ] = "LT", | |
111 | [ FILTER_OP_GE ] = "GE", | |
112 | [ FILTER_OP_LE ] = "LE", | |
113 | ||
114 | /* unary */ | |
115 | [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS", | |
116 | [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
117 | [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT", | |
118 | ||
119 | /* logical */ | |
120 | [ FILTER_OP_AND ] = "AND", | |
121 | [ FILTER_OP_OR ] = "OR", | |
122 | ||
123 | /* load */ | |
124 | [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", | |
2f0145d1 MD |
125 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", |
126 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", | |
127 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", | |
128 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", | |
129 | ||
cd54f6d9 MD |
130 | [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", |
131 | [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", | |
da6eed25 | 132 | [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", |
cd54f6d9 MD |
133 | }; |
134 | ||
135 | static | |
136 | const char *print_op(enum filter_op op) | |
137 | { | |
138 | if (op >= NR_FILTER_OPS) | |
139 | return "UNKNOWN"; | |
140 | else | |
141 | return opnames[op]; | |
142 | } | |
143 | ||
144 | /* | |
145 | * -1: wildcard found. | |
146 | * -2: unknown escape char. | |
147 | * 0: normal char. | |
148 | */ | |
149 | ||
150 | static | |
151 | int parse_char(const char **p) | |
152 | { | |
153 | switch (**p) { | |
154 | case '\\': | |
155 | (*p)++; | |
156 | switch (**p) { | |
157 | case '\\': | |
158 | case '*': | |
159 | return 0; | |
160 | default: | |
161 | return -2; | |
162 | } | |
163 | case '*': | |
164 | return -1; | |
165 | default: | |
166 | return 0; | |
167 | } | |
168 | } | |
169 | ||
170 | static | |
171 | int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type) | |
172 | { | |
173 | const char *p = reg[REG_R0].str, *q = reg[REG_R1].str; | |
174 | int ret; | |
175 | int diff; | |
176 | ||
177 | for (;;) { | |
178 | int escaped_r0 = 0; | |
179 | ||
180 | if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) { | |
181 | if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0') | |
182 | diff = 0; | |
183 | else | |
184 | diff = -1; | |
185 | break; | |
186 | } | |
187 | if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) { | |
188 | if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0') | |
189 | diff = 0; | |
190 | else | |
191 | diff = 1; | |
192 | break; | |
193 | } | |
194 | if (reg[REG_R0].literal) { | |
195 | ret = parse_char(&p); | |
196 | if (ret == -1) { | |
197 | return 0; | |
198 | } else if (ret == -2) { | |
199 | escaped_r0 = 1; | |
200 | } | |
201 | /* else compare both char */ | |
202 | } | |
203 | if (reg[REG_R1].literal) { | |
204 | ret = parse_char(&q); | |
205 | if (ret == -1) { | |
206 | return 0; | |
207 | } else if (ret == -2) { | |
208 | if (!escaped_r0) | |
209 | return -1; | |
210 | } else { | |
211 | if (escaped_r0) | |
212 | return 1; | |
213 | } | |
214 | } else { | |
215 | if (escaped_r0) | |
216 | return 1; | |
217 | } | |
218 | diff = *p - *q; | |
219 | if (diff != 0) | |
220 | break; | |
221 | p++; | |
222 | q++; | |
223 | } | |
224 | return diff; | |
225 | } | |
226 | ||
227 | static | |
228 | int lttng_filter_false(void *filter_data, | |
229 | const char *filter_stack_data) | |
230 | { | |
231 | return 0; | |
232 | } | |
2d78951a MD |
233 | |
234 | static | |
235 | int lttng_filter_interpret_bytecode(void *filter_data, | |
236 | const char *filter_stack_data) | |
237 | { | |
cd54f6d9 MD |
238 | struct bytecode_runtime *bytecode = filter_data; |
239 | void *pc, *next_pc, *start_pc; | |
240 | int ret = -EINVAL; | |
241 | int retval = 0; | |
242 | struct reg reg[NR_REG]; | |
cd54f6d9 MD |
243 | |
244 | start_pc = &bytecode->data[0]; | |
245 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
246 | pc = next_pc) { | |
cd54f6d9 MD |
247 | dbg_printf("Executing op %s (%u)\n", |
248 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
249 | (unsigned int) *(filter_opcode_t *) pc); | |
250 | switch (*(filter_opcode_t *) pc) { | |
251 | case FILTER_OP_UNKNOWN: | |
2f0145d1 | 252 | case FILTER_OP_LOAD_FIELD_REF: |
cd54f6d9 | 253 | default: |
b1caea50 | 254 | ERR("unknown bytecode op %u\n", |
cd54f6d9 MD |
255 | (unsigned int) *(filter_opcode_t *) pc); |
256 | ret = -EINVAL; | |
257 | goto end; | |
258 | ||
259 | case FILTER_OP_RETURN: | |
260 | retval = !!reg[0].v; | |
261 | ret = 0; | |
262 | goto end; | |
263 | ||
264 | /* binary */ | |
265 | case FILTER_OP_MUL: | |
266 | case FILTER_OP_DIV: | |
267 | case FILTER_OP_MOD: | |
268 | case FILTER_OP_PLUS: | |
269 | case FILTER_OP_MINUS: | |
270 | case FILTER_OP_RSHIFT: | |
271 | case FILTER_OP_LSHIFT: | |
272 | case FILTER_OP_BIN_AND: | |
273 | case FILTER_OP_BIN_OR: | |
274 | case FILTER_OP_BIN_XOR: | |
b1caea50 | 275 | ERR("unsupported bytecode op %u\n", |
cd54f6d9 MD |
276 | (unsigned int) *(filter_opcode_t *) pc); |
277 | ret = -EINVAL; | |
278 | goto end; | |
279 | ||
280 | case FILTER_OP_EQ: | |
281 | { | |
cd54f6d9 MD |
282 | switch (reg[REG_R0].type) { |
283 | default: | |
b1caea50 | 284 | ERR("unknown register type\n"); |
cd54f6d9 MD |
285 | ret = -EINVAL; |
286 | goto end; | |
287 | ||
288 | case REG_STRING: | |
cd54f6d9 MD |
289 | reg[REG_R0].v = (reg_strcmp(reg, "==") == 0); |
290 | break; | |
291 | case REG_S64: | |
da6eed25 MD |
292 | switch (reg[REG_R1].type) { |
293 | default: | |
b1caea50 | 294 | ERR("unknown register type\n"); |
da6eed25 MD |
295 | ret = -EINVAL; |
296 | goto end; | |
297 | ||
298 | case REG_S64: | |
299 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v); | |
300 | break; | |
301 | case REG_DOUBLE: | |
302 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].d); | |
303 | break; | |
304 | } | |
305 | break; | |
306 | case REG_DOUBLE: | |
307 | switch (reg[REG_R1].type) { | |
308 | default: | |
b1caea50 | 309 | ERR("unknown register type\n"); |
da6eed25 MD |
310 | ret = -EINVAL; |
311 | goto end; | |
312 | ||
313 | case REG_S64: | |
314 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].v); | |
315 | break; | |
316 | case REG_DOUBLE: | |
317 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].d); | |
318 | break; | |
319 | } | |
cd54f6d9 MD |
320 | break; |
321 | } | |
322 | reg[REG_R0].type = REG_S64; | |
323 | next_pc += sizeof(struct binary_op); | |
324 | break; | |
325 | } | |
326 | case FILTER_OP_NE: | |
327 | { | |
cd54f6d9 MD |
328 | switch (reg[REG_R0].type) { |
329 | default: | |
b1caea50 | 330 | ERR("unknown register type\n"); |
cd54f6d9 MD |
331 | ret = -EINVAL; |
332 | goto end; | |
333 | ||
334 | case REG_STRING: | |
cd54f6d9 MD |
335 | reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0); |
336 | break; | |
337 | case REG_S64: | |
da6eed25 MD |
338 | switch (reg[REG_R1].type) { |
339 | default: | |
b1caea50 | 340 | ERR("unknown register type\n"); |
da6eed25 MD |
341 | ret = -EINVAL; |
342 | goto end; | |
343 | ||
344 | case REG_S64: | |
345 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v); | |
346 | break; | |
347 | case REG_DOUBLE: | |
348 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].d); | |
349 | break; | |
350 | } | |
351 | break; | |
352 | case REG_DOUBLE: | |
353 | switch (reg[REG_R1].type) { | |
354 | default: | |
b1caea50 | 355 | ERR("unknown register type\n"); |
da6eed25 MD |
356 | ret = -EINVAL; |
357 | goto end; | |
358 | ||
359 | case REG_S64: | |
360 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].v); | |
361 | break; | |
362 | case REG_DOUBLE: | |
363 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].d); | |
364 | break; | |
365 | } | |
cd54f6d9 MD |
366 | break; |
367 | } | |
368 | reg[REG_R0].type = REG_S64; | |
369 | next_pc += sizeof(struct binary_op); | |
370 | break; | |
371 | } | |
372 | case FILTER_OP_GT: | |
373 | { | |
cd54f6d9 MD |
374 | switch (reg[REG_R0].type) { |
375 | default: | |
b1caea50 | 376 | ERR("unknown register type\n"); |
cd54f6d9 MD |
377 | ret = -EINVAL; |
378 | goto end; | |
379 | ||
380 | case REG_STRING: | |
cd54f6d9 MD |
381 | reg[REG_R0].v = (reg_strcmp(reg, ">") > 0); |
382 | break; | |
383 | case REG_S64: | |
da6eed25 MD |
384 | switch (reg[REG_R1].type) { |
385 | default: | |
b1caea50 | 386 | ERR("unknown register type\n"); |
da6eed25 MD |
387 | ret = -EINVAL; |
388 | goto end; | |
389 | ||
390 | case REG_S64: | |
391 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v); | |
392 | break; | |
393 | case REG_DOUBLE: | |
394 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].d); | |
395 | break; | |
396 | } | |
397 | break; | |
398 | case REG_DOUBLE: | |
399 | switch (reg[REG_R1].type) { | |
400 | default: | |
b1caea50 | 401 | ERR("unknown register type\n"); |
da6eed25 MD |
402 | ret = -EINVAL; |
403 | goto end; | |
404 | ||
405 | case REG_S64: | |
406 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].v); | |
407 | break; | |
408 | case REG_DOUBLE: | |
409 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].d); | |
410 | break; | |
411 | } | |
cd54f6d9 MD |
412 | break; |
413 | } | |
414 | reg[REG_R0].type = REG_S64; | |
415 | next_pc += sizeof(struct binary_op); | |
416 | break; | |
417 | } | |
418 | case FILTER_OP_LT: | |
419 | { | |
cd54f6d9 MD |
420 | switch (reg[REG_R0].type) { |
421 | default: | |
b1caea50 | 422 | ERR("unknown register type\n"); |
cd54f6d9 MD |
423 | ret = -EINVAL; |
424 | goto end; | |
425 | ||
426 | case REG_STRING: | |
cd54f6d9 MD |
427 | reg[REG_R0].v = (reg_strcmp(reg, "<") < 0); |
428 | break; | |
429 | case REG_S64: | |
da6eed25 MD |
430 | switch (reg[REG_R1].type) { |
431 | default: | |
b1caea50 | 432 | ERR("unknown register type\n"); |
da6eed25 MD |
433 | ret = -EINVAL; |
434 | goto end; | |
435 | ||
436 | case REG_S64: | |
437 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v); | |
438 | break; | |
439 | case REG_DOUBLE: | |
440 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].d); | |
441 | break; | |
442 | } | |
443 | break; | |
444 | case REG_DOUBLE: | |
445 | switch (reg[REG_R1].type) { | |
446 | default: | |
b1caea50 | 447 | ERR("unknown register type\n"); |
da6eed25 MD |
448 | ret = -EINVAL; |
449 | goto end; | |
450 | ||
451 | case REG_S64: | |
452 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].v); | |
453 | break; | |
454 | case REG_DOUBLE: | |
455 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].d); | |
456 | break; | |
457 | } | |
cd54f6d9 MD |
458 | break; |
459 | } | |
460 | reg[REG_R0].type = REG_S64; | |
461 | next_pc += sizeof(struct binary_op); | |
462 | break; | |
463 | } | |
464 | case FILTER_OP_GE: | |
465 | { | |
cd54f6d9 MD |
466 | switch (reg[REG_R0].type) { |
467 | default: | |
b1caea50 | 468 | ERR("unknown register type\n"); |
cd54f6d9 MD |
469 | ret = -EINVAL; |
470 | goto end; | |
471 | ||
472 | case REG_STRING: | |
cd54f6d9 MD |
473 | reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0); |
474 | break; | |
475 | case REG_S64: | |
da6eed25 MD |
476 | switch (reg[REG_R1].type) { |
477 | default: | |
b1caea50 | 478 | ERR("unknown register type\n"); |
da6eed25 MD |
479 | ret = -EINVAL; |
480 | goto end; | |
481 | ||
482 | case REG_S64: | |
483 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v); | |
484 | break; | |
485 | case REG_DOUBLE: | |
486 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].d); | |
487 | break; | |
488 | } | |
489 | break; | |
490 | case REG_DOUBLE: | |
491 | switch (reg[REG_R1].type) { | |
492 | default: | |
b1caea50 | 493 | ERR("unknown register type\n"); |
da6eed25 MD |
494 | ret = -EINVAL; |
495 | goto end; | |
496 | ||
497 | case REG_S64: | |
498 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].v); | |
499 | break; | |
500 | case REG_DOUBLE: | |
501 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].d); | |
502 | break; | |
503 | } | |
cd54f6d9 MD |
504 | break; |
505 | } | |
506 | reg[REG_R0].type = REG_S64; | |
507 | next_pc += sizeof(struct binary_op); | |
508 | break; | |
509 | } | |
510 | case FILTER_OP_LE: | |
511 | { | |
cd54f6d9 MD |
512 | switch (reg[REG_R0].type) { |
513 | default: | |
b1caea50 | 514 | ERR("unknown register type\n"); |
cd54f6d9 MD |
515 | ret = -EINVAL; |
516 | goto end; | |
517 | ||
518 | case REG_STRING: | |
cd54f6d9 MD |
519 | reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0); |
520 | break; | |
521 | case REG_S64: | |
da6eed25 MD |
522 | switch (reg[REG_R1].type) { |
523 | default: | |
b1caea50 | 524 | ERR("unknown register type\n"); |
da6eed25 MD |
525 | ret = -EINVAL; |
526 | goto end; | |
527 | ||
528 | case REG_S64: | |
529 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v); | |
530 | break; | |
531 | case REG_DOUBLE: | |
532 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].d); | |
533 | break; | |
534 | } | |
535 | break; | |
536 | case REG_DOUBLE: | |
537 | switch (reg[REG_R1].type) { | |
538 | default: | |
b1caea50 | 539 | ERR("unknown register type\n"); |
da6eed25 MD |
540 | ret = -EINVAL; |
541 | goto end; | |
542 | ||
543 | case REG_S64: | |
544 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].v); | |
545 | break; | |
546 | case REG_DOUBLE: | |
547 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].d); | |
548 | break; | |
549 | } | |
cd54f6d9 MD |
550 | break; |
551 | } | |
552 | reg[REG_R0].type = REG_S64; | |
553 | next_pc += sizeof(struct binary_op); | |
554 | break; | |
555 | } | |
556 | ||
557 | /* unary */ | |
558 | case FILTER_OP_UNARY_PLUS: | |
559 | { | |
cd54f6d9 MD |
560 | next_pc += sizeof(struct unary_op); |
561 | break; | |
562 | } | |
563 | case FILTER_OP_UNARY_MINUS: | |
564 | { | |
565 | struct unary_op *insn = (struct unary_op *) pc; | |
566 | ||
da6eed25 MD |
567 | switch (reg[insn->reg].type) { |
568 | default: | |
b1caea50 | 569 | ERR("unknown register type\n"); |
cd54f6d9 MD |
570 | ret = -EINVAL; |
571 | goto end; | |
da6eed25 MD |
572 | |
573 | case REG_STRING: | |
b1caea50 | 574 | ERR("Unary minus can only be applied to numeric or floating point registers\n"); |
da6eed25 MD |
575 | ret = -EINVAL; |
576 | goto end; | |
577 | case REG_S64: | |
578 | reg[insn->reg].v = -reg[insn->reg].v; | |
579 | break; | |
580 | case REG_DOUBLE: | |
581 | reg[insn->reg].d = -reg[insn->reg].d; | |
582 | break; | |
cd54f6d9 | 583 | } |
cd54f6d9 MD |
584 | next_pc += sizeof(struct unary_op); |
585 | break; | |
586 | } | |
587 | case FILTER_OP_UNARY_NOT: | |
588 | { | |
589 | struct unary_op *insn = (struct unary_op *) pc; | |
590 | ||
da6eed25 MD |
591 | switch (reg[insn->reg].type) { |
592 | default: | |
b1caea50 | 593 | ERR("unknown register type\n"); |
da6eed25 MD |
594 | ret = -EINVAL; |
595 | goto end; | |
596 | ||
597 | case REG_STRING: | |
b1caea50 | 598 | ERR("Unary not can only be applied to numeric or floating point registers\n"); |
da6eed25 MD |
599 | ret = -EINVAL; |
600 | goto end; | |
601 | case REG_S64: | |
602 | reg[insn->reg].v = !reg[insn->reg].v; | |
603 | break; | |
604 | case REG_DOUBLE: | |
605 | reg[insn->reg].d = !reg[insn->reg].d; | |
606 | break; | |
607 | } | |
cd54f6d9 MD |
608 | reg[insn->reg].v = !reg[insn->reg].v; |
609 | next_pc += sizeof(struct unary_op); | |
610 | break; | |
611 | } | |
612 | /* logical */ | |
613 | case FILTER_OP_AND: | |
614 | { | |
615 | struct logical_op *insn = (struct logical_op *) pc; | |
616 | ||
cd54f6d9 | 617 | /* If REG_R0 is 0, skip and evaluate to 0 */ |
da6eed25 MD |
618 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v == 0) |
619 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d == 0.0)) { | |
cd54f6d9 MD |
620 | dbg_printf("Jumping to bytecode offset %u\n", |
621 | (unsigned int) insn->skip_offset); | |
622 | next_pc = start_pc + insn->skip_offset; | |
cd54f6d9 MD |
623 | } else { |
624 | next_pc += sizeof(struct logical_op); | |
625 | } | |
626 | break; | |
627 | } | |
628 | case FILTER_OP_OR: | |
629 | { | |
630 | struct logical_op *insn = (struct logical_op *) pc; | |
631 | ||
cd54f6d9 | 632 | /* If REG_R0 is nonzero, skip and evaluate to 1 */ |
da6eed25 MD |
633 | |
634 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v != 0) | |
635 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d != 0.0)) { | |
cd54f6d9 MD |
636 | reg[REG_R0].v = 1; |
637 | dbg_printf("Jumping to bytecode offset %u\n", | |
638 | (unsigned int) insn->skip_offset); | |
639 | next_pc = start_pc + insn->skip_offset; | |
cd54f6d9 MD |
640 | } else { |
641 | next_pc += sizeof(struct logical_op); | |
642 | } | |
643 | break; | |
644 | } | |
645 | ||
646 | /* load */ | |
2f0145d1 | 647 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
cd54f6d9 MD |
648 | { |
649 | struct load_op *insn = (struct load_op *) pc; | |
650 | struct field_ref *ref = (struct field_ref *) insn->data; | |
651 | ||
2f0145d1 MD |
652 | dbg_printf("load field ref offset %u type string\n", |
653 | ref->offset); | |
654 | reg[insn->reg].str = | |
655 | *(const char * const *) &filter_stack_data[ref->offset]; | |
656 | reg[insn->reg].type = REG_STRING; | |
657 | reg[insn->reg].seq_len = UINT_MAX; | |
658 | reg[insn->reg].literal = 0; | |
659 | dbg_printf("ref load string %s\n", reg[insn->reg].str); | |
660 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
661 | break; | |
662 | } | |
cd54f6d9 | 663 | |
2f0145d1 MD |
664 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
665 | { | |
666 | struct load_op *insn = (struct load_op *) pc; | |
667 | struct field_ref *ref = (struct field_ref *) insn->data; | |
cd54f6d9 | 668 | |
2f0145d1 MD |
669 | dbg_printf("load field ref offset %u type sequence\n", |
670 | ref->offset); | |
671 | reg[insn->reg].seq_len = | |
672 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
673 | reg[insn->reg].str = | |
674 | *(const char **) (&filter_stack_data[ref->offset | |
675 | + sizeof(unsigned long)]); | |
676 | reg[insn->reg].type = REG_STRING; | |
677 | reg[insn->reg].literal = 0; | |
678 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
679 | break; | |
680 | } | |
681 | ||
682 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
683 | { | |
684 | struct load_op *insn = (struct load_op *) pc; | |
685 | struct field_ref *ref = (struct field_ref *) insn->data; | |
686 | ||
687 | dbg_printf("load field ref offset %u type s64\n", | |
688 | ref->offset); | |
689 | memcpy(®[insn->reg].v, &filter_stack_data[ref->offset], | |
690 | sizeof(struct literal_numeric)); | |
691 | reg[insn->reg].type = REG_S64; | |
692 | reg[insn->reg].literal = 0; | |
693 | dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v); | |
694 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
695 | break; | |
696 | } | |
697 | ||
698 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
699 | { | |
700 | struct load_op *insn = (struct load_op *) pc; | |
701 | struct field_ref *ref = (struct field_ref *) insn->data; | |
702 | ||
703 | dbg_printf("load field ref offset %u type double\n", | |
704 | ref->offset); | |
705 | memcpy(®[insn->reg].d, &filter_stack_data[ref->offset], | |
706 | sizeof(struct literal_double)); | |
707 | reg[insn->reg].type = REG_DOUBLE; | |
708 | reg[insn->reg].literal = 0; | |
709 | dbg_printf("ref load double %g\n", reg[insn->reg].d); | |
cd54f6d9 MD |
710 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
711 | break; | |
712 | } | |
713 | ||
714 | case FILTER_OP_LOAD_STRING: | |
715 | { | |
716 | struct load_op *insn = (struct load_op *) pc; | |
717 | ||
cd54f6d9 MD |
718 | dbg_printf("load string %s\n", insn->data); |
719 | reg[insn->reg].str = insn->data; | |
720 | reg[insn->reg].type = REG_STRING; | |
721 | reg[insn->reg].seq_len = UINT_MAX; | |
722 | reg[insn->reg].literal = 1; | |
723 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
724 | break; | |
725 | } | |
726 | ||
727 | case FILTER_OP_LOAD_S64: | |
728 | { | |
729 | struct load_op *insn = (struct load_op *) pc; | |
730 | ||
cd54f6d9 MD |
731 | memcpy(®[insn->reg].v, insn->data, |
732 | sizeof(struct literal_numeric)); | |
733 | dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v); | |
734 | reg[insn->reg].type = REG_S64; | |
735 | next_pc += sizeof(struct load_op) | |
736 | + sizeof(struct literal_numeric); | |
737 | break; | |
738 | } | |
da6eed25 MD |
739 | |
740 | case FILTER_OP_LOAD_DOUBLE: | |
741 | { | |
742 | struct load_op *insn = (struct load_op *) pc; | |
743 | ||
da6eed25 MD |
744 | memcpy(®[insn->reg].d, insn->data, |
745 | sizeof(struct literal_double)); | |
746 | dbg_printf("load s64 %g\n", reg[insn->reg].d); | |
747 | reg[insn->reg].type = REG_DOUBLE; | |
748 | next_pc += sizeof(struct load_op) | |
749 | + sizeof(struct literal_double); | |
750 | break; | |
751 | } | |
cd54f6d9 MD |
752 | } |
753 | } | |
754 | end: | |
755 | /* return 0 (discard) on error */ | |
756 | if (ret) | |
757 | return 0; | |
758 | return retval; | |
759 | } | |
760 | ||
9522a886 MD |
761 | static |
762 | int bin_op_compare_check(struct vreg reg[NR_REG], const char *str) | |
763 | { | |
764 | switch (reg[REG_R0].type) { | |
765 | default: | |
766 | goto error_unknown; | |
767 | ||
768 | case REG_STRING: | |
769 | switch (reg[REG_R1].type) { | |
770 | default: | |
771 | goto error_unknown; | |
772 | ||
773 | case REG_STRING: | |
774 | break; | |
775 | case REG_S64: | |
776 | case REG_DOUBLE: | |
777 | goto error_mismatch; | |
778 | } | |
779 | break; | |
780 | case REG_S64: | |
781 | case REG_DOUBLE: | |
782 | switch (reg[REG_R1].type) { | |
783 | default: | |
784 | goto error_unknown; | |
785 | ||
786 | case REG_STRING: | |
787 | goto error_mismatch; | |
788 | ||
789 | case REG_S64: | |
790 | case REG_DOUBLE: | |
791 | break; | |
792 | } | |
793 | break; | |
794 | } | |
795 | return 0; | |
796 | ||
797 | error_unknown: | |
798 | ||
799 | return -EINVAL; | |
800 | error_mismatch: | |
801 | ERR("type mismatch for '%s' binary operator\n", str); | |
802 | return -EINVAL; | |
803 | } | |
804 | ||
805 | static | |
806 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
807 | { | |
808 | void *pc, *next_pc, *start_pc; | |
809 | int ret = -EINVAL; | |
810 | struct vreg reg[NR_REG]; | |
811 | int i; | |
812 | ||
813 | for (i = 0; i < NR_REG; i++) { | |
225b6640 | 814 | reg[i].type = REG_TYPE_UNKNOWN; |
9522a886 MD |
815 | reg[i].literal = 0; |
816 | } | |
817 | ||
818 | start_pc = &bytecode->data[0]; | |
819 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
820 | pc = next_pc) { | |
821 | if (unlikely(pc >= start_pc + bytecode->len)) { | |
822 | ERR("filter bytecode overflow\n"); | |
823 | ret = -EINVAL; | |
824 | goto end; | |
825 | } | |
826 | dbg_printf("Validating op %s (%u)\n", | |
827 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
828 | (unsigned int) *(filter_opcode_t *) pc); | |
829 | switch (*(filter_opcode_t *) pc) { | |
830 | case FILTER_OP_UNKNOWN: | |
831 | default: | |
832 | ERR("unknown bytecode op %u\n", | |
833 | (unsigned int) *(filter_opcode_t *) pc); | |
834 | ret = -EINVAL; | |
835 | goto end; | |
836 | ||
837 | case FILTER_OP_RETURN: | |
838 | ret = 0; | |
839 | goto end; | |
840 | ||
841 | /* binary */ | |
842 | case FILTER_OP_MUL: | |
843 | case FILTER_OP_DIV: | |
844 | case FILTER_OP_MOD: | |
845 | case FILTER_OP_PLUS: | |
846 | case FILTER_OP_MINUS: | |
847 | case FILTER_OP_RSHIFT: | |
848 | case FILTER_OP_LSHIFT: | |
849 | case FILTER_OP_BIN_AND: | |
850 | case FILTER_OP_BIN_OR: | |
851 | case FILTER_OP_BIN_XOR: | |
852 | ERR("unsupported bytecode op %u\n", | |
853 | (unsigned int) *(filter_opcode_t *) pc); | |
854 | ret = -EINVAL; | |
855 | goto end; | |
856 | ||
857 | case FILTER_OP_EQ: | |
858 | { | |
859 | ret = bin_op_compare_check(reg, "=="); | |
860 | if (ret) | |
861 | goto end; | |
862 | reg[REG_R0].type = REG_S64; | |
863 | next_pc += sizeof(struct binary_op); | |
864 | break; | |
865 | } | |
866 | case FILTER_OP_NE: | |
867 | { | |
868 | ret = bin_op_compare_check(reg, "!="); | |
869 | if (ret) | |
870 | goto end; | |
871 | reg[REG_R0].type = REG_S64; | |
872 | next_pc += sizeof(struct binary_op); | |
873 | break; | |
874 | } | |
875 | case FILTER_OP_GT: | |
876 | { | |
877 | ret = bin_op_compare_check(reg, ">"); | |
878 | if (ret) | |
879 | goto end; | |
880 | reg[REG_R0].type = REG_S64; | |
881 | next_pc += sizeof(struct binary_op); | |
882 | break; | |
883 | } | |
884 | case FILTER_OP_LT: | |
885 | { | |
886 | ret = bin_op_compare_check(reg, "<"); | |
887 | if (ret) | |
888 | goto end; | |
889 | reg[REG_R0].type = REG_S64; | |
890 | next_pc += sizeof(struct binary_op); | |
891 | break; | |
892 | } | |
893 | case FILTER_OP_GE: | |
894 | { | |
895 | ret = bin_op_compare_check(reg, ">="); | |
896 | if (ret) | |
897 | goto end; | |
898 | reg[REG_R0].type = REG_S64; | |
899 | next_pc += sizeof(struct binary_op); | |
900 | break; | |
901 | } | |
902 | case FILTER_OP_LE: | |
903 | { | |
904 | ret = bin_op_compare_check(reg, "<="); | |
905 | if (ret) | |
906 | goto end; | |
907 | reg[REG_R0].type = REG_S64; | |
908 | next_pc += sizeof(struct binary_op); | |
909 | break; | |
910 | } | |
911 | ||
912 | /* unary */ | |
913 | case FILTER_OP_UNARY_PLUS: | |
914 | case FILTER_OP_UNARY_MINUS: | |
915 | case FILTER_OP_UNARY_NOT: | |
916 | { | |
917 | struct unary_op *insn = (struct unary_op *) pc; | |
918 | ||
919 | if (unlikely(insn->reg >= REG_ERROR)) { | |
920 | ERR("invalid register %u\n", | |
921 | (unsigned int) insn->reg); | |
922 | ret = -EINVAL; | |
923 | goto end; | |
924 | } | |
925 | switch (reg[insn->reg].type) { | |
926 | default: | |
927 | ERR("unknown register type\n"); | |
928 | ret = -EINVAL; | |
929 | goto end; | |
930 | ||
931 | case REG_STRING: | |
932 | ERR("Unary op can only be applied to numeric or floating point registers\n"); | |
933 | ret = -EINVAL; | |
934 | goto end; | |
935 | case REG_S64: | |
936 | break; | |
937 | case REG_DOUBLE: | |
938 | break; | |
939 | } | |
940 | next_pc += sizeof(struct unary_op); | |
941 | break; | |
942 | } | |
943 | /* logical */ | |
944 | case FILTER_OP_AND: | |
945 | case FILTER_OP_OR: | |
946 | { | |
947 | struct logical_op *insn = (struct logical_op *) pc; | |
948 | ||
225b6640 MD |
949 | if (unlikely(reg[REG_R0].type == REG_TYPE_UNKNOWN |
950 | || reg[REG_R0].type == REG_TYPE_UNKNOWN | |
951 | || reg[REG_R0].type == REG_STRING | |
952 | || reg[REG_R1].type == REG_STRING)) { | |
953 | ERR("Logical comparator can only be applied to numeric and floating point registers\n"); | |
9522a886 MD |
954 | ret = -EINVAL; |
955 | goto end; | |
956 | } | |
957 | ||
958 | dbg_printf("Validate jumping to bytecode offset %u\n", | |
959 | (unsigned int) insn->skip_offset); | |
960 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
961 | ERR("Loops are not allowed in bytecode\n"); | |
962 | ret = -EINVAL; | |
963 | goto end; | |
964 | } | |
965 | next_pc += sizeof(struct logical_op); | |
966 | break; | |
967 | } | |
968 | ||
969 | /* load */ | |
970 | case FILTER_OP_LOAD_FIELD_REF: | |
2f0145d1 MD |
971 | { |
972 | ERR("Unknown field ref type\n"); | |
973 | ret = -EINVAL; | |
974 | goto end; | |
975 | } | |
976 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
977 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
9522a886 MD |
978 | { |
979 | struct load_op *insn = (struct load_op *) pc; | |
980 | struct field_ref *ref = (struct field_ref *) insn->data; | |
981 | ||
982 | if (unlikely(insn->reg >= REG_ERROR)) { | |
983 | ERR("invalid register %u\n", | |
984 | (unsigned int) insn->reg); | |
985 | ret = -EINVAL; | |
986 | goto end; | |
987 | } | |
2f0145d1 MD |
988 | dbg_printf("Validate load field ref offset %u type string\n", |
989 | ref->offset); | |
990 | reg[insn->reg].type = REG_STRING; | |
991 | reg[insn->reg].literal = 0; | |
992 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
993 | break; | |
994 | } | |
995 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
996 | { | |
997 | struct load_op *insn = (struct load_op *) pc; | |
998 | struct field_ref *ref = (struct field_ref *) insn->data; | |
999 | ||
1000 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1001 | ERR("invalid register %u\n", | |
1002 | (unsigned int) insn->reg); | |
9522a886 MD |
1003 | ret = -EINVAL; |
1004 | goto end; | |
9522a886 | 1005 | } |
2f0145d1 MD |
1006 | dbg_printf("Validate load field ref offset %u type s64\n", |
1007 | ref->offset); | |
1008 | reg[insn->reg].type = REG_S64; | |
1009 | reg[insn->reg].literal = 0; | |
1010 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1011 | break; | |
1012 | } | |
1013 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
1014 | { | |
1015 | struct load_op *insn = (struct load_op *) pc; | |
1016 | struct field_ref *ref = (struct field_ref *) insn->data; | |
9522a886 | 1017 | |
2f0145d1 MD |
1018 | if (unlikely(insn->reg >= REG_ERROR)) { |
1019 | ERR("invalid register %u\n", | |
1020 | (unsigned int) insn->reg); | |
1021 | ret = -EINVAL; | |
1022 | goto end; | |
1023 | } | |
1024 | dbg_printf("Validate load field ref offset %u type double\n", | |
1025 | ref->offset); | |
1026 | reg[insn->reg].type = REG_DOUBLE; | |
1027 | reg[insn->reg].literal = 0; | |
9522a886 MD |
1028 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | case FILTER_OP_LOAD_STRING: | |
1033 | { | |
1034 | struct load_op *insn = (struct load_op *) pc; | |
1035 | ||
1036 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1037 | ERR("invalid register %u\n", | |
1038 | (unsigned int) insn->reg); | |
1039 | ret = -EINVAL; | |
1040 | goto end; | |
1041 | } | |
1042 | reg[insn->reg].type = REG_STRING; | |
1043 | reg[insn->reg].literal = 1; | |
1044 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
1045 | break; | |
1046 | } | |
1047 | ||
1048 | case FILTER_OP_LOAD_S64: | |
1049 | { | |
1050 | struct load_op *insn = (struct load_op *) pc; | |
1051 | ||
1052 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1053 | ERR("invalid register %u\n", | |
1054 | (unsigned int) insn->reg); | |
1055 | ret = -EINVAL; | |
1056 | goto end; | |
1057 | } | |
1058 | reg[insn->reg].type = REG_S64; | |
1059 | next_pc += sizeof(struct load_op) | |
1060 | + sizeof(struct literal_numeric); | |
1061 | break; | |
1062 | } | |
1063 | ||
1064 | case FILTER_OP_LOAD_DOUBLE: | |
1065 | { | |
1066 | struct load_op *insn = (struct load_op *) pc; | |
1067 | ||
1068 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1069 | ERR("invalid register %u\n", | |
1070 | (unsigned int) insn->reg); | |
1071 | ret = -EINVAL; | |
1072 | goto end; | |
1073 | } | |
1074 | reg[insn->reg].type = REG_DOUBLE; | |
1075 | next_pc += sizeof(struct load_op) | |
1076 | + sizeof(struct literal_double); | |
1077 | break; | |
1078 | } | |
1079 | } | |
1080 | } | |
1081 | end: | |
1082 | return ret; | |
1083 | } | |
1084 | ||
cd54f6d9 MD |
1085 | static |
1086 | int apply_field_reloc(struct ltt_event *event, | |
1087 | struct bytecode_runtime *runtime, | |
1088 | uint32_t runtime_len, | |
1089 | uint32_t reloc_offset, | |
1090 | const char *field_name) | |
1091 | { | |
1092 | const struct lttng_event_desc *desc; | |
1093 | const struct lttng_event_field *fields, *field = NULL; | |
1094 | unsigned int nr_fields, i; | |
1095 | struct field_ref *field_ref; | |
2f0145d1 | 1096 | struct load_op *op; |
cd54f6d9 MD |
1097 | uint32_t field_offset = 0; |
1098 | ||
a8c27c7c | 1099 | dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name); |
cd54f6d9 MD |
1100 | |
1101 | /* Ensure that the reloc is within the code */ | |
1102 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
1103 | return -EINVAL; | |
1104 | ||
1105 | /* Lookup event by name */ | |
1106 | desc = event->desc; | |
1107 | if (!desc) | |
1108 | return -EINVAL; | |
1109 | fields = desc->fields; | |
1110 | if (!fields) | |
1111 | return -EINVAL; | |
1112 | nr_fields = desc->nr_fields; | |
1113 | for (i = 0; i < nr_fields; i++) { | |
1114 | if (!strcmp(fields[i].name, field_name)) { | |
1115 | field = &fields[i]; | |
1116 | break; | |
1117 | } | |
1118 | /* compute field offset */ | |
1119 | switch (fields[i].type.atype) { | |
1120 | case atype_integer: | |
1121 | case atype_enum: | |
1122 | field_offset += sizeof(int64_t); | |
1123 | break; | |
1124 | case atype_array: | |
1125 | case atype_sequence: | |
1126 | field_offset += sizeof(unsigned long); | |
1127 | field_offset += sizeof(void *); | |
1128 | break; | |
1129 | case atype_string: | |
1130 | field_offset += sizeof(void *); | |
1131 | break; | |
1132 | case atype_float: | |
1133 | field_offset += sizeof(double); | |
da6eed25 | 1134 | break; |
cd54f6d9 MD |
1135 | default: |
1136 | return -EINVAL; | |
1137 | } | |
1138 | } | |
1139 | if (!field) | |
1140 | return -EINVAL; | |
1141 | ||
1142 | /* Check if field offset is too large for 16-bit offset */ | |
1143 | if (field_offset > FILTER_BYTECODE_MAX_LEN) | |
1144 | return -EINVAL; | |
1145 | ||
1146 | /* set type */ | |
2f0145d1 MD |
1147 | op = (struct load_op *) &runtime->data[reloc_offset]; |
1148 | field_ref = (struct field_ref *) op->data; | |
cd54f6d9 MD |
1149 | switch (field->type.atype) { |
1150 | case atype_integer: | |
1151 | case atype_enum: | |
2f0145d1 | 1152 | op->op = FILTER_OP_LOAD_FIELD_REF_S64; |
cd54f6d9 MD |
1153 | break; |
1154 | case atype_array: | |
1155 | case atype_sequence: | |
2f0145d1 | 1156 | op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE; |
cd54f6d9 MD |
1157 | break; |
1158 | case atype_string: | |
2f0145d1 | 1159 | op->op = FILTER_OP_LOAD_FIELD_REF_STRING; |
cd54f6d9 MD |
1160 | break; |
1161 | case atype_float: | |
2f0145d1 | 1162 | op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE; |
da6eed25 | 1163 | break; |
cd54f6d9 MD |
1164 | default: |
1165 | return -EINVAL; | |
1166 | } | |
1167 | /* set offset */ | |
1168 | field_ref->offset = (uint16_t) field_offset; | |
2d78951a MD |
1169 | return 0; |
1170 | } | |
1171 | ||
cd54f6d9 MD |
1172 | /* |
1173 | * Take a bytecode with reloc table and link it to an event to create a | |
1174 | * bytecode runtime. | |
1175 | */ | |
2d78951a MD |
1176 | static |
1177 | int _lttng_filter_event_link_bytecode(struct ltt_event *event, | |
1178 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1179 | { | |
cd54f6d9 MD |
1180 | int ret, offset, next_offset; |
1181 | struct bytecode_runtime *runtime = NULL; | |
1182 | size_t runtime_alloc_len; | |
1183 | ||
2d78951a MD |
1184 | if (!filter_bytecode) |
1185 | return 0; | |
cd54f6d9 MD |
1186 | /* Even is not connected to any description */ |
1187 | if (!event->desc) | |
1188 | return 0; | |
1189 | /* Bytecode already linked */ | |
1190 | if (event->filter || event->filter_data) | |
1191 | return 0; | |
2d78951a | 1192 | |
a8c27c7c | 1193 | dbg_printf("Linking\n"); |
cd54f6d9 MD |
1194 | |
1195 | /* We don't need the reloc table in the runtime */ | |
1196 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset; | |
1197 | runtime = zmalloc(runtime_alloc_len); | |
1198 | if (!runtime) { | |
1199 | ret = -ENOMEM; | |
1200 | goto link_error; | |
1201 | } | |
1202 | runtime->len = filter_bytecode->reloc_offset; | |
1203 | /* copy original bytecode */ | |
1204 | memcpy(runtime->data, filter_bytecode->data, runtime->len); | |
1205 | /* | |
1206 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
1207 | * followed by a string (field name). | |
1208 | */ | |
cd54f6d9 MD |
1209 | for (offset = filter_bytecode->reloc_offset; |
1210 | offset < filter_bytecode->len; | |
1211 | offset = next_offset) { | |
1212 | uint16_t reloc_offset = | |
1213 | *(uint16_t *) &filter_bytecode->data[offset]; | |
1214 | const char *field_name = | |
1215 | (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)]; | |
1216 | ||
1217 | ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name); | |
1218 | if (ret) { | |
1219 | goto link_error; | |
1220 | } | |
1221 | next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1; | |
1222 | } | |
9522a886 MD |
1223 | /* Validate bytecode */ |
1224 | ret = lttng_filter_validate_bytecode(runtime); | |
1225 | if (ret) { | |
1226 | goto link_error; | |
1227 | } | |
cd54f6d9 | 1228 | event->filter_data = runtime; |
2d78951a | 1229 | event->filter = lttng_filter_interpret_bytecode; |
2d78951a | 1230 | return 0; |
cd54f6d9 MD |
1231 | |
1232 | link_error: | |
1233 | event->filter = lttng_filter_false; | |
1234 | free(runtime); | |
1235 | return ret; | |
2d78951a MD |
1236 | } |
1237 | ||
1238 | void lttng_filter_event_link_bytecode(struct ltt_event *event, | |
1239 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1240 | { | |
1241 | int ret; | |
1242 | ||
cd54f6d9 | 1243 | ret = _lttng_filter_event_link_bytecode(event, filter_bytecode); |
2d78951a MD |
1244 | if (ret) { |
1245 | fprintf(stderr, "[lttng filter] error linking event bytecode\n"); | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * Link bytecode to all events for a wildcard. Skips events that already | |
1251 | * have a bytecode linked. | |
1252 | * We do not set each event's filter_bytecode field, because they do not | |
1253 | * own the filter_bytecode: the wildcard owns it. | |
1254 | */ | |
1255 | void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard) | |
1256 | { | |
1257 | struct ltt_event *event; | |
1258 | int ret; | |
1259 | ||
1260 | if (!wildcard->filter_bytecode) | |
1261 | return; | |
1262 | ||
1263 | cds_list_for_each_entry(event, &wildcard->events, wildcard_list) { | |
1264 | if (event->filter) | |
1265 | continue; | |
1266 | ret = _lttng_filter_event_link_bytecode(event, | |
1267 | wildcard->filter_bytecode); | |
1268 | if (ret) { | |
1269 | fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n"); | |
1270 | } | |
1271 | ||
1272 | } | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * Need to attach filter to an event before starting tracing for the | |
cd54f6d9 | 1278 | * session. We own the filter_bytecode if we return success. |
2d78951a MD |
1279 | */ |
1280 | int lttng_filter_event_attach_bytecode(struct ltt_event *event, | |
1281 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1282 | { | |
2d78951a MD |
1283 | if (event->chan->session->been_active) |
1284 | return -EPERM; | |
1285 | if (event->filter_bytecode) | |
1286 | return -EEXIST; | |
cd54f6d9 | 1287 | event->filter_bytecode = filter_bytecode; |
2d78951a MD |
1288 | return 0; |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Need to attach filter to a wildcard before starting tracing for the | |
cd54f6d9 | 1293 | * session. We own the filter_bytecode if we return success. |
2d78951a MD |
1294 | */ |
1295 | int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard, | |
1296 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1297 | { | |
2d78951a MD |
1298 | if (wildcard->chan->session->been_active) |
1299 | return -EPERM; | |
1300 | if (wildcard->filter_bytecode) | |
1301 | return -EEXIST; | |
cd54f6d9 | 1302 | wildcard->filter_bytecode = filter_bytecode; |
2d78951a MD |
1303 | return 0; |
1304 | } |