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, | |
71 | }; | |
72 | ||
73 | /* Validation registers */ | |
74 | struct vreg { | |
75 | enum reg_type type; | |
76 | int literal; /* is string literal ? */ | |
77 | }; | |
78 | ||
79 | /* Execution registers */ | |
cd54f6d9 | 80 | struct reg { |
9522a886 | 81 | enum reg_type type; |
cd54f6d9 | 82 | int64_t v; |
da6eed25 | 83 | double d; |
cd54f6d9 MD |
84 | |
85 | const char *str; | |
86 | size_t seq_len; | |
87 | int literal; /* is string literal ? */ | |
88 | }; | |
89 | ||
90 | static const char *opnames[] = { | |
91 | [ FILTER_OP_UNKNOWN ] = "UNKNOWN", | |
92 | ||
93 | [ FILTER_OP_RETURN ] = "RETURN", | |
94 | ||
95 | /* binary */ | |
96 | [ FILTER_OP_MUL ] = "MUL", | |
97 | [ FILTER_OP_DIV ] = "DIV", | |
98 | [ FILTER_OP_MOD ] = "MOD", | |
99 | [ FILTER_OP_PLUS ] = "PLUS", | |
100 | [ FILTER_OP_MINUS ] = "MINUS", | |
101 | [ FILTER_OP_RSHIFT ] = "RSHIFT", | |
102 | [ FILTER_OP_LSHIFT ] = "LSHIFT", | |
103 | [ FILTER_OP_BIN_AND ] = "BIN_AND", | |
104 | [ FILTER_OP_BIN_OR ] = "BIN_OR", | |
105 | [ FILTER_OP_BIN_XOR ] = "BIN_XOR", | |
106 | [ FILTER_OP_EQ ] = "EQ", | |
107 | [ FILTER_OP_NE ] = "NE", | |
108 | [ FILTER_OP_GT ] = "GT", | |
109 | [ FILTER_OP_LT ] = "LT", | |
110 | [ FILTER_OP_GE ] = "GE", | |
111 | [ FILTER_OP_LE ] = "LE", | |
112 | ||
113 | /* unary */ | |
114 | [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS", | |
115 | [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
116 | [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT", | |
117 | ||
118 | /* logical */ | |
119 | [ FILTER_OP_AND ] = "AND", | |
120 | [ FILTER_OP_OR ] = "OR", | |
121 | ||
122 | /* load */ | |
123 | [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", | |
2f0145d1 MD |
124 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", |
125 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", | |
126 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", | |
127 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", | |
128 | ||
cd54f6d9 MD |
129 | [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", |
130 | [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", | |
da6eed25 | 131 | [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", |
cd54f6d9 MD |
132 | }; |
133 | ||
134 | static | |
135 | const char *print_op(enum filter_op op) | |
136 | { | |
137 | if (op >= NR_FILTER_OPS) | |
138 | return "UNKNOWN"; | |
139 | else | |
140 | return opnames[op]; | |
141 | } | |
142 | ||
143 | /* | |
144 | * -1: wildcard found. | |
145 | * -2: unknown escape char. | |
146 | * 0: normal char. | |
147 | */ | |
148 | ||
149 | static | |
150 | int parse_char(const char **p) | |
151 | { | |
152 | switch (**p) { | |
153 | case '\\': | |
154 | (*p)++; | |
155 | switch (**p) { | |
156 | case '\\': | |
157 | case '*': | |
158 | return 0; | |
159 | default: | |
160 | return -2; | |
161 | } | |
162 | case '*': | |
163 | return -1; | |
164 | default: | |
165 | return 0; | |
166 | } | |
167 | } | |
168 | ||
169 | static | |
170 | int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type) | |
171 | { | |
172 | const char *p = reg[REG_R0].str, *q = reg[REG_R1].str; | |
173 | int ret; | |
174 | int diff; | |
175 | ||
176 | for (;;) { | |
177 | int escaped_r0 = 0; | |
178 | ||
179 | if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) { | |
180 | if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0') | |
181 | diff = 0; | |
182 | else | |
183 | diff = -1; | |
184 | break; | |
185 | } | |
186 | if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) { | |
187 | if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0') | |
188 | diff = 0; | |
189 | else | |
190 | diff = 1; | |
191 | break; | |
192 | } | |
193 | if (reg[REG_R0].literal) { | |
194 | ret = parse_char(&p); | |
195 | if (ret == -1) { | |
196 | return 0; | |
197 | } else if (ret == -2) { | |
198 | escaped_r0 = 1; | |
199 | } | |
200 | /* else compare both char */ | |
201 | } | |
202 | if (reg[REG_R1].literal) { | |
203 | ret = parse_char(&q); | |
204 | if (ret == -1) { | |
205 | return 0; | |
206 | } else if (ret == -2) { | |
207 | if (!escaped_r0) | |
208 | return -1; | |
209 | } else { | |
210 | if (escaped_r0) | |
211 | return 1; | |
212 | } | |
213 | } else { | |
214 | if (escaped_r0) | |
215 | return 1; | |
216 | } | |
217 | diff = *p - *q; | |
218 | if (diff != 0) | |
219 | break; | |
220 | p++; | |
221 | q++; | |
222 | } | |
223 | return diff; | |
224 | } | |
225 | ||
226 | static | |
227 | int lttng_filter_false(void *filter_data, | |
228 | const char *filter_stack_data) | |
229 | { | |
230 | return 0; | |
231 | } | |
2d78951a MD |
232 | |
233 | static | |
234 | int lttng_filter_interpret_bytecode(void *filter_data, | |
235 | const char *filter_stack_data) | |
236 | { | |
cd54f6d9 MD |
237 | struct bytecode_runtime *bytecode = filter_data; |
238 | void *pc, *next_pc, *start_pc; | |
239 | int ret = -EINVAL; | |
240 | int retval = 0; | |
241 | struct reg reg[NR_REG]; | |
242 | int i; | |
243 | ||
244 | for (i = 0; i < NR_REG; i++) { | |
245 | reg[i].type = REG_S64; | |
246 | reg[i].v = 0; | |
da6eed25 | 247 | reg[i].d = 0.0; |
cd54f6d9 MD |
248 | reg[i].str = NULL; |
249 | reg[i].seq_len = 0; | |
250 | reg[i].literal = 0; | |
251 | } | |
252 | ||
253 | start_pc = &bytecode->data[0]; | |
254 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
255 | pc = next_pc) { | |
cd54f6d9 MD |
256 | dbg_printf("Executing op %s (%u)\n", |
257 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
258 | (unsigned int) *(filter_opcode_t *) pc); | |
259 | switch (*(filter_opcode_t *) pc) { | |
260 | case FILTER_OP_UNKNOWN: | |
2f0145d1 | 261 | case FILTER_OP_LOAD_FIELD_REF: |
cd54f6d9 | 262 | default: |
b1caea50 | 263 | ERR("unknown bytecode op %u\n", |
cd54f6d9 MD |
264 | (unsigned int) *(filter_opcode_t *) pc); |
265 | ret = -EINVAL; | |
266 | goto end; | |
267 | ||
268 | case FILTER_OP_RETURN: | |
269 | retval = !!reg[0].v; | |
270 | ret = 0; | |
271 | goto end; | |
272 | ||
273 | /* binary */ | |
274 | case FILTER_OP_MUL: | |
275 | case FILTER_OP_DIV: | |
276 | case FILTER_OP_MOD: | |
277 | case FILTER_OP_PLUS: | |
278 | case FILTER_OP_MINUS: | |
279 | case FILTER_OP_RSHIFT: | |
280 | case FILTER_OP_LSHIFT: | |
281 | case FILTER_OP_BIN_AND: | |
282 | case FILTER_OP_BIN_OR: | |
283 | case FILTER_OP_BIN_XOR: | |
b1caea50 | 284 | ERR("unsupported bytecode op %u\n", |
cd54f6d9 MD |
285 | (unsigned int) *(filter_opcode_t *) pc); |
286 | ret = -EINVAL; | |
287 | goto end; | |
288 | ||
289 | case FILTER_OP_EQ: | |
290 | { | |
cd54f6d9 MD |
291 | switch (reg[REG_R0].type) { |
292 | default: | |
b1caea50 | 293 | ERR("unknown register type\n"); |
cd54f6d9 MD |
294 | ret = -EINVAL; |
295 | goto end; | |
296 | ||
297 | case REG_STRING: | |
cd54f6d9 MD |
298 | reg[REG_R0].v = (reg_strcmp(reg, "==") == 0); |
299 | break; | |
300 | case REG_S64: | |
da6eed25 MD |
301 | switch (reg[REG_R1].type) { |
302 | default: | |
b1caea50 | 303 | ERR("unknown register type\n"); |
da6eed25 MD |
304 | ret = -EINVAL; |
305 | goto end; | |
306 | ||
307 | case REG_S64: | |
308 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v); | |
309 | break; | |
310 | case REG_DOUBLE: | |
311 | reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].d); | |
312 | break; | |
313 | } | |
314 | break; | |
315 | case REG_DOUBLE: | |
316 | switch (reg[REG_R1].type) { | |
317 | default: | |
b1caea50 | 318 | ERR("unknown register type\n"); |
da6eed25 MD |
319 | ret = -EINVAL; |
320 | goto end; | |
321 | ||
322 | case REG_S64: | |
323 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].v); | |
324 | break; | |
325 | case REG_DOUBLE: | |
326 | reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].d); | |
327 | break; | |
328 | } | |
cd54f6d9 MD |
329 | break; |
330 | } | |
331 | reg[REG_R0].type = REG_S64; | |
332 | next_pc += sizeof(struct binary_op); | |
333 | break; | |
334 | } | |
335 | case FILTER_OP_NE: | |
336 | { | |
cd54f6d9 MD |
337 | switch (reg[REG_R0].type) { |
338 | default: | |
b1caea50 | 339 | ERR("unknown register type\n"); |
cd54f6d9 MD |
340 | ret = -EINVAL; |
341 | goto end; | |
342 | ||
343 | case REG_STRING: | |
cd54f6d9 MD |
344 | reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0); |
345 | break; | |
346 | case REG_S64: | |
da6eed25 MD |
347 | switch (reg[REG_R1].type) { |
348 | default: | |
b1caea50 | 349 | ERR("unknown register type\n"); |
da6eed25 MD |
350 | ret = -EINVAL; |
351 | goto end; | |
352 | ||
353 | case REG_S64: | |
354 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v); | |
355 | break; | |
356 | case REG_DOUBLE: | |
357 | reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].d); | |
358 | break; | |
359 | } | |
360 | break; | |
361 | case REG_DOUBLE: | |
362 | switch (reg[REG_R1].type) { | |
363 | default: | |
b1caea50 | 364 | ERR("unknown register type\n"); |
da6eed25 MD |
365 | ret = -EINVAL; |
366 | goto end; | |
367 | ||
368 | case REG_S64: | |
369 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].v); | |
370 | break; | |
371 | case REG_DOUBLE: | |
372 | reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].d); | |
373 | break; | |
374 | } | |
cd54f6d9 MD |
375 | break; |
376 | } | |
377 | reg[REG_R0].type = REG_S64; | |
378 | next_pc += sizeof(struct binary_op); | |
379 | break; | |
380 | } | |
381 | case FILTER_OP_GT: | |
382 | { | |
cd54f6d9 MD |
383 | switch (reg[REG_R0].type) { |
384 | default: | |
b1caea50 | 385 | ERR("unknown register type\n"); |
cd54f6d9 MD |
386 | ret = -EINVAL; |
387 | goto end; | |
388 | ||
389 | case REG_STRING: | |
cd54f6d9 MD |
390 | reg[REG_R0].v = (reg_strcmp(reg, ">") > 0); |
391 | break; | |
392 | case REG_S64: | |
da6eed25 MD |
393 | switch (reg[REG_R1].type) { |
394 | default: | |
b1caea50 | 395 | ERR("unknown register type\n"); |
da6eed25 MD |
396 | ret = -EINVAL; |
397 | goto end; | |
398 | ||
399 | case REG_S64: | |
400 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v); | |
401 | break; | |
402 | case REG_DOUBLE: | |
403 | reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].d); | |
404 | break; | |
405 | } | |
406 | break; | |
407 | case REG_DOUBLE: | |
408 | switch (reg[REG_R1].type) { | |
409 | default: | |
b1caea50 | 410 | ERR("unknown register type\n"); |
da6eed25 MD |
411 | ret = -EINVAL; |
412 | goto end; | |
413 | ||
414 | case REG_S64: | |
415 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].v); | |
416 | break; | |
417 | case REG_DOUBLE: | |
418 | reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].d); | |
419 | break; | |
420 | } | |
cd54f6d9 MD |
421 | break; |
422 | } | |
423 | reg[REG_R0].type = REG_S64; | |
424 | next_pc += sizeof(struct binary_op); | |
425 | break; | |
426 | } | |
427 | case FILTER_OP_LT: | |
428 | { | |
cd54f6d9 MD |
429 | switch (reg[REG_R0].type) { |
430 | default: | |
b1caea50 | 431 | ERR("unknown register type\n"); |
cd54f6d9 MD |
432 | ret = -EINVAL; |
433 | goto end; | |
434 | ||
435 | case REG_STRING: | |
cd54f6d9 MD |
436 | reg[REG_R0].v = (reg_strcmp(reg, "<") < 0); |
437 | break; | |
438 | case REG_S64: | |
da6eed25 MD |
439 | switch (reg[REG_R1].type) { |
440 | default: | |
b1caea50 | 441 | ERR("unknown register type\n"); |
da6eed25 MD |
442 | ret = -EINVAL; |
443 | goto end; | |
444 | ||
445 | case REG_S64: | |
446 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v); | |
447 | break; | |
448 | case REG_DOUBLE: | |
449 | reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].d); | |
450 | break; | |
451 | } | |
452 | break; | |
453 | case REG_DOUBLE: | |
454 | switch (reg[REG_R1].type) { | |
455 | default: | |
b1caea50 | 456 | ERR("unknown register type\n"); |
da6eed25 MD |
457 | ret = -EINVAL; |
458 | goto end; | |
459 | ||
460 | case REG_S64: | |
461 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].v); | |
462 | break; | |
463 | case REG_DOUBLE: | |
464 | reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].d); | |
465 | break; | |
466 | } | |
cd54f6d9 MD |
467 | break; |
468 | } | |
469 | reg[REG_R0].type = REG_S64; | |
470 | next_pc += sizeof(struct binary_op); | |
471 | break; | |
472 | } | |
473 | case FILTER_OP_GE: | |
474 | { | |
cd54f6d9 MD |
475 | switch (reg[REG_R0].type) { |
476 | default: | |
b1caea50 | 477 | ERR("unknown register type\n"); |
cd54f6d9 MD |
478 | ret = -EINVAL; |
479 | goto end; | |
480 | ||
481 | case REG_STRING: | |
cd54f6d9 MD |
482 | reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0); |
483 | break; | |
484 | case REG_S64: | |
da6eed25 MD |
485 | switch (reg[REG_R1].type) { |
486 | default: | |
b1caea50 | 487 | ERR("unknown register type\n"); |
da6eed25 MD |
488 | ret = -EINVAL; |
489 | goto end; | |
490 | ||
491 | case REG_S64: | |
492 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v); | |
493 | break; | |
494 | case REG_DOUBLE: | |
495 | reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].d); | |
496 | break; | |
497 | } | |
498 | break; | |
499 | case REG_DOUBLE: | |
500 | switch (reg[REG_R1].type) { | |
501 | default: | |
b1caea50 | 502 | ERR("unknown register type\n"); |
da6eed25 MD |
503 | ret = -EINVAL; |
504 | goto end; | |
505 | ||
506 | case REG_S64: | |
507 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].v); | |
508 | break; | |
509 | case REG_DOUBLE: | |
510 | reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].d); | |
511 | break; | |
512 | } | |
cd54f6d9 MD |
513 | break; |
514 | } | |
515 | reg[REG_R0].type = REG_S64; | |
516 | next_pc += sizeof(struct binary_op); | |
517 | break; | |
518 | } | |
519 | case FILTER_OP_LE: | |
520 | { | |
cd54f6d9 MD |
521 | switch (reg[REG_R0].type) { |
522 | default: | |
b1caea50 | 523 | ERR("unknown register type\n"); |
cd54f6d9 MD |
524 | ret = -EINVAL; |
525 | goto end; | |
526 | ||
527 | case REG_STRING: | |
cd54f6d9 MD |
528 | reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0); |
529 | break; | |
530 | case REG_S64: | |
da6eed25 MD |
531 | switch (reg[REG_R1].type) { |
532 | default: | |
b1caea50 | 533 | ERR("unknown register type\n"); |
da6eed25 MD |
534 | ret = -EINVAL; |
535 | goto end; | |
536 | ||
537 | case REG_S64: | |
538 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v); | |
539 | break; | |
540 | case REG_DOUBLE: | |
541 | reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].d); | |
542 | break; | |
543 | } | |
544 | break; | |
545 | case REG_DOUBLE: | |
546 | switch (reg[REG_R1].type) { | |
547 | default: | |
b1caea50 | 548 | ERR("unknown register type\n"); |
da6eed25 MD |
549 | ret = -EINVAL; |
550 | goto end; | |
551 | ||
552 | case REG_S64: | |
553 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].v); | |
554 | break; | |
555 | case REG_DOUBLE: | |
556 | reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].d); | |
557 | break; | |
558 | } | |
cd54f6d9 MD |
559 | break; |
560 | } | |
561 | reg[REG_R0].type = REG_S64; | |
562 | next_pc += sizeof(struct binary_op); | |
563 | break; | |
564 | } | |
565 | ||
566 | /* unary */ | |
567 | case FILTER_OP_UNARY_PLUS: | |
568 | { | |
cd54f6d9 MD |
569 | next_pc += sizeof(struct unary_op); |
570 | break; | |
571 | } | |
572 | case FILTER_OP_UNARY_MINUS: | |
573 | { | |
574 | struct unary_op *insn = (struct unary_op *) pc; | |
575 | ||
da6eed25 MD |
576 | switch (reg[insn->reg].type) { |
577 | default: | |
b1caea50 | 578 | ERR("unknown register type\n"); |
cd54f6d9 MD |
579 | ret = -EINVAL; |
580 | goto end; | |
da6eed25 MD |
581 | |
582 | case REG_STRING: | |
b1caea50 | 583 | ERR("Unary minus can only be applied to numeric or floating point registers\n"); |
da6eed25 MD |
584 | ret = -EINVAL; |
585 | goto end; | |
586 | case REG_S64: | |
587 | reg[insn->reg].v = -reg[insn->reg].v; | |
588 | break; | |
589 | case REG_DOUBLE: | |
590 | reg[insn->reg].d = -reg[insn->reg].d; | |
591 | break; | |
cd54f6d9 | 592 | } |
cd54f6d9 MD |
593 | next_pc += sizeof(struct unary_op); |
594 | break; | |
595 | } | |
596 | case FILTER_OP_UNARY_NOT: | |
597 | { | |
598 | struct unary_op *insn = (struct unary_op *) pc; | |
599 | ||
da6eed25 MD |
600 | switch (reg[insn->reg].type) { |
601 | default: | |
b1caea50 | 602 | ERR("unknown register type\n"); |
da6eed25 MD |
603 | ret = -EINVAL; |
604 | goto end; | |
605 | ||
606 | case REG_STRING: | |
b1caea50 | 607 | ERR("Unary not can only be applied to numeric or floating point registers\n"); |
da6eed25 MD |
608 | ret = -EINVAL; |
609 | goto end; | |
610 | case REG_S64: | |
611 | reg[insn->reg].v = !reg[insn->reg].v; | |
612 | break; | |
613 | case REG_DOUBLE: | |
614 | reg[insn->reg].d = !reg[insn->reg].d; | |
615 | break; | |
616 | } | |
cd54f6d9 MD |
617 | reg[insn->reg].v = !reg[insn->reg].v; |
618 | next_pc += sizeof(struct unary_op); | |
619 | break; | |
620 | } | |
621 | /* logical */ | |
622 | case FILTER_OP_AND: | |
623 | { | |
624 | struct logical_op *insn = (struct logical_op *) pc; | |
625 | ||
cd54f6d9 | 626 | /* If REG_R0 is 0, skip and evaluate to 0 */ |
da6eed25 MD |
627 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v == 0) |
628 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d == 0.0)) { | |
cd54f6d9 MD |
629 | dbg_printf("Jumping to bytecode offset %u\n", |
630 | (unsigned int) insn->skip_offset); | |
631 | next_pc = start_pc + insn->skip_offset; | |
cd54f6d9 MD |
632 | } else { |
633 | next_pc += sizeof(struct logical_op); | |
634 | } | |
635 | break; | |
636 | } | |
637 | case FILTER_OP_OR: | |
638 | { | |
639 | struct logical_op *insn = (struct logical_op *) pc; | |
640 | ||
cd54f6d9 | 641 | /* If REG_R0 is nonzero, skip and evaluate to 1 */ |
da6eed25 MD |
642 | |
643 | if ((reg[REG_R0].type == REG_S64 && reg[REG_R0].v != 0) | |
644 | || (reg[REG_R0].type == REG_DOUBLE && reg[REG_R0].d != 0.0)) { | |
cd54f6d9 MD |
645 | reg[REG_R0].v = 1; |
646 | dbg_printf("Jumping to bytecode offset %u\n", | |
647 | (unsigned int) insn->skip_offset); | |
648 | next_pc = start_pc + insn->skip_offset; | |
cd54f6d9 MD |
649 | } else { |
650 | next_pc += sizeof(struct logical_op); | |
651 | } | |
652 | break; | |
653 | } | |
654 | ||
655 | /* load */ | |
2f0145d1 | 656 | case FILTER_OP_LOAD_FIELD_REF_STRING: |
cd54f6d9 MD |
657 | { |
658 | struct load_op *insn = (struct load_op *) pc; | |
659 | struct field_ref *ref = (struct field_ref *) insn->data; | |
660 | ||
2f0145d1 MD |
661 | dbg_printf("load field ref offset %u type string\n", |
662 | ref->offset); | |
663 | reg[insn->reg].str = | |
664 | *(const char * const *) &filter_stack_data[ref->offset]; | |
665 | reg[insn->reg].type = REG_STRING; | |
666 | reg[insn->reg].seq_len = UINT_MAX; | |
667 | reg[insn->reg].literal = 0; | |
668 | dbg_printf("ref load string %s\n", reg[insn->reg].str); | |
669 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
670 | break; | |
671 | } | |
cd54f6d9 | 672 | |
2f0145d1 MD |
673 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: |
674 | { | |
675 | struct load_op *insn = (struct load_op *) pc; | |
676 | struct field_ref *ref = (struct field_ref *) insn->data; | |
cd54f6d9 | 677 | |
2f0145d1 MD |
678 | dbg_printf("load field ref offset %u type sequence\n", |
679 | ref->offset); | |
680 | reg[insn->reg].seq_len = | |
681 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
682 | reg[insn->reg].str = | |
683 | *(const char **) (&filter_stack_data[ref->offset | |
684 | + sizeof(unsigned long)]); | |
685 | reg[insn->reg].type = REG_STRING; | |
686 | reg[insn->reg].literal = 0; | |
687 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
688 | break; | |
689 | } | |
690 | ||
691 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
692 | { | |
693 | struct load_op *insn = (struct load_op *) pc; | |
694 | struct field_ref *ref = (struct field_ref *) insn->data; | |
695 | ||
696 | dbg_printf("load field ref offset %u type s64\n", | |
697 | ref->offset); | |
698 | memcpy(®[insn->reg].v, &filter_stack_data[ref->offset], | |
699 | sizeof(struct literal_numeric)); | |
700 | reg[insn->reg].type = REG_S64; | |
701 | reg[insn->reg].literal = 0; | |
702 | dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v); | |
703 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
704 | break; | |
705 | } | |
706 | ||
707 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
708 | { | |
709 | struct load_op *insn = (struct load_op *) pc; | |
710 | struct field_ref *ref = (struct field_ref *) insn->data; | |
711 | ||
712 | dbg_printf("load field ref offset %u type double\n", | |
713 | ref->offset); | |
714 | memcpy(®[insn->reg].d, &filter_stack_data[ref->offset], | |
715 | sizeof(struct literal_double)); | |
716 | reg[insn->reg].type = REG_DOUBLE; | |
717 | reg[insn->reg].literal = 0; | |
718 | dbg_printf("ref load double %g\n", reg[insn->reg].d); | |
cd54f6d9 MD |
719 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
720 | break; | |
721 | } | |
722 | ||
723 | case FILTER_OP_LOAD_STRING: | |
724 | { | |
725 | struct load_op *insn = (struct load_op *) pc; | |
726 | ||
cd54f6d9 MD |
727 | dbg_printf("load string %s\n", insn->data); |
728 | reg[insn->reg].str = insn->data; | |
729 | reg[insn->reg].type = REG_STRING; | |
730 | reg[insn->reg].seq_len = UINT_MAX; | |
731 | reg[insn->reg].literal = 1; | |
732 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
733 | break; | |
734 | } | |
735 | ||
736 | case FILTER_OP_LOAD_S64: | |
737 | { | |
738 | struct load_op *insn = (struct load_op *) pc; | |
739 | ||
cd54f6d9 MD |
740 | memcpy(®[insn->reg].v, insn->data, |
741 | sizeof(struct literal_numeric)); | |
742 | dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v); | |
743 | reg[insn->reg].type = REG_S64; | |
744 | next_pc += sizeof(struct load_op) | |
745 | + sizeof(struct literal_numeric); | |
746 | break; | |
747 | } | |
da6eed25 MD |
748 | |
749 | case FILTER_OP_LOAD_DOUBLE: | |
750 | { | |
751 | struct load_op *insn = (struct load_op *) pc; | |
752 | ||
da6eed25 MD |
753 | memcpy(®[insn->reg].d, insn->data, |
754 | sizeof(struct literal_double)); | |
755 | dbg_printf("load s64 %g\n", reg[insn->reg].d); | |
756 | reg[insn->reg].type = REG_DOUBLE; | |
757 | next_pc += sizeof(struct load_op) | |
758 | + sizeof(struct literal_double); | |
759 | break; | |
760 | } | |
cd54f6d9 MD |
761 | } |
762 | } | |
763 | end: | |
764 | /* return 0 (discard) on error */ | |
765 | if (ret) | |
766 | return 0; | |
767 | return retval; | |
768 | } | |
769 | ||
9522a886 MD |
770 | static |
771 | int bin_op_compare_check(struct vreg reg[NR_REG], const char *str) | |
772 | { | |
773 | switch (reg[REG_R0].type) { | |
774 | default: | |
775 | goto error_unknown; | |
776 | ||
777 | case REG_STRING: | |
778 | switch (reg[REG_R1].type) { | |
779 | default: | |
780 | goto error_unknown; | |
781 | ||
782 | case REG_STRING: | |
783 | break; | |
784 | case REG_S64: | |
785 | case REG_DOUBLE: | |
786 | goto error_mismatch; | |
787 | } | |
788 | break; | |
789 | case REG_S64: | |
790 | case REG_DOUBLE: | |
791 | switch (reg[REG_R1].type) { | |
792 | default: | |
793 | goto error_unknown; | |
794 | ||
795 | case REG_STRING: | |
796 | goto error_mismatch; | |
797 | ||
798 | case REG_S64: | |
799 | case REG_DOUBLE: | |
800 | break; | |
801 | } | |
802 | break; | |
803 | } | |
804 | return 0; | |
805 | ||
806 | error_unknown: | |
807 | ||
808 | return -EINVAL; | |
809 | error_mismatch: | |
810 | ERR("type mismatch for '%s' binary operator\n", str); | |
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | static | |
815 | int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode) | |
816 | { | |
817 | void *pc, *next_pc, *start_pc; | |
818 | int ret = -EINVAL; | |
819 | struct vreg reg[NR_REG]; | |
820 | int i; | |
821 | ||
822 | for (i = 0; i < NR_REG; i++) { | |
823 | reg[i].type = REG_S64; | |
824 | reg[i].literal = 0; | |
825 | } | |
826 | ||
827 | start_pc = &bytecode->data[0]; | |
828 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; | |
829 | pc = next_pc) { | |
830 | if (unlikely(pc >= start_pc + bytecode->len)) { | |
831 | ERR("filter bytecode overflow\n"); | |
832 | ret = -EINVAL; | |
833 | goto end; | |
834 | } | |
835 | dbg_printf("Validating op %s (%u)\n", | |
836 | print_op((unsigned int) *(filter_opcode_t *) pc), | |
837 | (unsigned int) *(filter_opcode_t *) pc); | |
838 | switch (*(filter_opcode_t *) pc) { | |
839 | case FILTER_OP_UNKNOWN: | |
840 | default: | |
841 | ERR("unknown bytecode op %u\n", | |
842 | (unsigned int) *(filter_opcode_t *) pc); | |
843 | ret = -EINVAL; | |
844 | goto end; | |
845 | ||
846 | case FILTER_OP_RETURN: | |
847 | ret = 0; | |
848 | goto end; | |
849 | ||
850 | /* binary */ | |
851 | case FILTER_OP_MUL: | |
852 | case FILTER_OP_DIV: | |
853 | case FILTER_OP_MOD: | |
854 | case FILTER_OP_PLUS: | |
855 | case FILTER_OP_MINUS: | |
856 | case FILTER_OP_RSHIFT: | |
857 | case FILTER_OP_LSHIFT: | |
858 | case FILTER_OP_BIN_AND: | |
859 | case FILTER_OP_BIN_OR: | |
860 | case FILTER_OP_BIN_XOR: | |
861 | ERR("unsupported bytecode op %u\n", | |
862 | (unsigned int) *(filter_opcode_t *) pc); | |
863 | ret = -EINVAL; | |
864 | goto end; | |
865 | ||
866 | case FILTER_OP_EQ: | |
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_NE: | |
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_GT: | |
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_LT: | |
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_GE: | |
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 | case FILTER_OP_LE: | |
912 | { | |
913 | ret = bin_op_compare_check(reg, "<="); | |
914 | if (ret) | |
915 | goto end; | |
916 | reg[REG_R0].type = REG_S64; | |
917 | next_pc += sizeof(struct binary_op); | |
918 | break; | |
919 | } | |
920 | ||
921 | /* unary */ | |
922 | case FILTER_OP_UNARY_PLUS: | |
923 | case FILTER_OP_UNARY_MINUS: | |
924 | case FILTER_OP_UNARY_NOT: | |
925 | { | |
926 | struct unary_op *insn = (struct unary_op *) pc; | |
927 | ||
928 | if (unlikely(insn->reg >= REG_ERROR)) { | |
929 | ERR("invalid register %u\n", | |
930 | (unsigned int) insn->reg); | |
931 | ret = -EINVAL; | |
932 | goto end; | |
933 | } | |
934 | switch (reg[insn->reg].type) { | |
935 | default: | |
936 | ERR("unknown register type\n"); | |
937 | ret = -EINVAL; | |
938 | goto end; | |
939 | ||
940 | case REG_STRING: | |
941 | ERR("Unary op can only be applied to numeric or floating point registers\n"); | |
942 | ret = -EINVAL; | |
943 | goto end; | |
944 | case REG_S64: | |
945 | break; | |
946 | case REG_DOUBLE: | |
947 | break; | |
948 | } | |
949 | next_pc += sizeof(struct unary_op); | |
950 | break; | |
951 | } | |
952 | /* logical */ | |
953 | case FILTER_OP_AND: | |
954 | case FILTER_OP_OR: | |
955 | { | |
956 | struct logical_op *insn = (struct logical_op *) pc; | |
957 | ||
958 | if (unlikely(reg[REG_R0].type == REG_STRING)) { | |
959 | ERR("Logical operator 'and' can only be applied to numeric and floating point registers\n"); | |
960 | ret = -EINVAL; | |
961 | goto end; | |
962 | } | |
963 | ||
964 | dbg_printf("Validate jumping to bytecode offset %u\n", | |
965 | (unsigned int) insn->skip_offset); | |
966 | if (unlikely(start_pc + insn->skip_offset <= pc)) { | |
967 | ERR("Loops are not allowed in bytecode\n"); | |
968 | ret = -EINVAL; | |
969 | goto end; | |
970 | } | |
971 | next_pc += sizeof(struct logical_op); | |
972 | break; | |
973 | } | |
974 | ||
975 | /* load */ | |
976 | case FILTER_OP_LOAD_FIELD_REF: | |
2f0145d1 MD |
977 | { |
978 | ERR("Unknown field ref type\n"); | |
979 | ret = -EINVAL; | |
980 | goto end; | |
981 | } | |
982 | case FILTER_OP_LOAD_FIELD_REF_STRING: | |
983 | case FILTER_OP_LOAD_FIELD_REF_SEQUENCE: | |
9522a886 MD |
984 | { |
985 | struct load_op *insn = (struct load_op *) pc; | |
986 | struct field_ref *ref = (struct field_ref *) insn->data; | |
987 | ||
988 | if (unlikely(insn->reg >= REG_ERROR)) { | |
989 | ERR("invalid register %u\n", | |
990 | (unsigned int) insn->reg); | |
991 | ret = -EINVAL; | |
992 | goto end; | |
993 | } | |
2f0145d1 MD |
994 | dbg_printf("Validate load field ref offset %u type string\n", |
995 | ref->offset); | |
996 | reg[insn->reg].type = REG_STRING; | |
997 | reg[insn->reg].literal = 0; | |
998 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
999 | break; | |
1000 | } | |
1001 | case FILTER_OP_LOAD_FIELD_REF_S64: | |
1002 | { | |
1003 | struct load_op *insn = (struct load_op *) pc; | |
1004 | struct field_ref *ref = (struct field_ref *) insn->data; | |
1005 | ||
1006 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1007 | ERR("invalid register %u\n", | |
1008 | (unsigned int) insn->reg); | |
9522a886 MD |
1009 | ret = -EINVAL; |
1010 | goto end; | |
9522a886 | 1011 | } |
2f0145d1 MD |
1012 | dbg_printf("Validate load field ref offset %u type s64\n", |
1013 | ref->offset); | |
1014 | reg[insn->reg].type = REG_S64; | |
1015 | reg[insn->reg].literal = 0; | |
1016 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
1017 | break; | |
1018 | } | |
1019 | case FILTER_OP_LOAD_FIELD_REF_DOUBLE: | |
1020 | { | |
1021 | struct load_op *insn = (struct load_op *) pc; | |
1022 | struct field_ref *ref = (struct field_ref *) insn->data; | |
9522a886 | 1023 | |
2f0145d1 MD |
1024 | if (unlikely(insn->reg >= REG_ERROR)) { |
1025 | ERR("invalid register %u\n", | |
1026 | (unsigned int) insn->reg); | |
1027 | ret = -EINVAL; | |
1028 | goto end; | |
1029 | } | |
1030 | dbg_printf("Validate load field ref offset %u type double\n", | |
1031 | ref->offset); | |
1032 | reg[insn->reg].type = REG_DOUBLE; | |
1033 | reg[insn->reg].literal = 0; | |
9522a886 MD |
1034 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
1035 | break; | |
1036 | } | |
1037 | ||
1038 | case FILTER_OP_LOAD_STRING: | |
1039 | { | |
1040 | struct load_op *insn = (struct load_op *) pc; | |
1041 | ||
1042 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1043 | ERR("invalid register %u\n", | |
1044 | (unsigned int) insn->reg); | |
1045 | ret = -EINVAL; | |
1046 | goto end; | |
1047 | } | |
1048 | reg[insn->reg].type = REG_STRING; | |
1049 | reg[insn->reg].literal = 1; | |
1050 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
1051 | break; | |
1052 | } | |
1053 | ||
1054 | case FILTER_OP_LOAD_S64: | |
1055 | { | |
1056 | struct load_op *insn = (struct load_op *) pc; | |
1057 | ||
1058 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1059 | ERR("invalid register %u\n", | |
1060 | (unsigned int) insn->reg); | |
1061 | ret = -EINVAL; | |
1062 | goto end; | |
1063 | } | |
1064 | reg[insn->reg].type = REG_S64; | |
1065 | next_pc += sizeof(struct load_op) | |
1066 | + sizeof(struct literal_numeric); | |
1067 | break; | |
1068 | } | |
1069 | ||
1070 | case FILTER_OP_LOAD_DOUBLE: | |
1071 | { | |
1072 | struct load_op *insn = (struct load_op *) pc; | |
1073 | ||
1074 | if (unlikely(insn->reg >= REG_ERROR)) { | |
1075 | ERR("invalid register %u\n", | |
1076 | (unsigned int) insn->reg); | |
1077 | ret = -EINVAL; | |
1078 | goto end; | |
1079 | } | |
1080 | reg[insn->reg].type = REG_DOUBLE; | |
1081 | next_pc += sizeof(struct load_op) | |
1082 | + sizeof(struct literal_double); | |
1083 | break; | |
1084 | } | |
1085 | } | |
1086 | } | |
1087 | end: | |
1088 | return ret; | |
1089 | } | |
1090 | ||
cd54f6d9 MD |
1091 | static |
1092 | int apply_field_reloc(struct ltt_event *event, | |
1093 | struct bytecode_runtime *runtime, | |
1094 | uint32_t runtime_len, | |
1095 | uint32_t reloc_offset, | |
1096 | const char *field_name) | |
1097 | { | |
1098 | const struct lttng_event_desc *desc; | |
1099 | const struct lttng_event_field *fields, *field = NULL; | |
1100 | unsigned int nr_fields, i; | |
1101 | struct field_ref *field_ref; | |
2f0145d1 | 1102 | struct load_op *op; |
cd54f6d9 MD |
1103 | uint32_t field_offset = 0; |
1104 | ||
a8c27c7c | 1105 | dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name); |
cd54f6d9 MD |
1106 | |
1107 | /* Ensure that the reloc is within the code */ | |
1108 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
1109 | return -EINVAL; | |
1110 | ||
1111 | /* Lookup event by name */ | |
1112 | desc = event->desc; | |
1113 | if (!desc) | |
1114 | return -EINVAL; | |
1115 | fields = desc->fields; | |
1116 | if (!fields) | |
1117 | return -EINVAL; | |
1118 | nr_fields = desc->nr_fields; | |
1119 | for (i = 0; i < nr_fields; i++) { | |
1120 | if (!strcmp(fields[i].name, field_name)) { | |
1121 | field = &fields[i]; | |
1122 | break; | |
1123 | } | |
1124 | /* compute field offset */ | |
1125 | switch (fields[i].type.atype) { | |
1126 | case atype_integer: | |
1127 | case atype_enum: | |
1128 | field_offset += sizeof(int64_t); | |
1129 | break; | |
1130 | case atype_array: | |
1131 | case atype_sequence: | |
1132 | field_offset += sizeof(unsigned long); | |
1133 | field_offset += sizeof(void *); | |
1134 | break; | |
1135 | case atype_string: | |
1136 | field_offset += sizeof(void *); | |
1137 | break; | |
1138 | case atype_float: | |
1139 | field_offset += sizeof(double); | |
da6eed25 | 1140 | break; |
cd54f6d9 MD |
1141 | default: |
1142 | return -EINVAL; | |
1143 | } | |
1144 | } | |
1145 | if (!field) | |
1146 | return -EINVAL; | |
1147 | ||
1148 | /* Check if field offset is too large for 16-bit offset */ | |
1149 | if (field_offset > FILTER_BYTECODE_MAX_LEN) | |
1150 | return -EINVAL; | |
1151 | ||
1152 | /* set type */ | |
2f0145d1 MD |
1153 | op = (struct load_op *) &runtime->data[reloc_offset]; |
1154 | field_ref = (struct field_ref *) op->data; | |
cd54f6d9 MD |
1155 | switch (field->type.atype) { |
1156 | case atype_integer: | |
1157 | case atype_enum: | |
2f0145d1 | 1158 | op->op = FILTER_OP_LOAD_FIELD_REF_S64; |
cd54f6d9 MD |
1159 | break; |
1160 | case atype_array: | |
1161 | case atype_sequence: | |
2f0145d1 | 1162 | op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE; |
cd54f6d9 MD |
1163 | break; |
1164 | case atype_string: | |
2f0145d1 | 1165 | op->op = FILTER_OP_LOAD_FIELD_REF_STRING; |
cd54f6d9 MD |
1166 | break; |
1167 | case atype_float: | |
2f0145d1 | 1168 | op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE; |
da6eed25 | 1169 | break; |
cd54f6d9 MD |
1170 | default: |
1171 | return -EINVAL; | |
1172 | } | |
1173 | /* set offset */ | |
1174 | field_ref->offset = (uint16_t) field_offset; | |
2d78951a MD |
1175 | return 0; |
1176 | } | |
1177 | ||
cd54f6d9 MD |
1178 | /* |
1179 | * Take a bytecode with reloc table and link it to an event to create a | |
1180 | * bytecode runtime. | |
1181 | */ | |
2d78951a MD |
1182 | static |
1183 | int _lttng_filter_event_link_bytecode(struct ltt_event *event, | |
1184 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1185 | { | |
cd54f6d9 MD |
1186 | int ret, offset, next_offset; |
1187 | struct bytecode_runtime *runtime = NULL; | |
1188 | size_t runtime_alloc_len; | |
1189 | ||
2d78951a MD |
1190 | if (!filter_bytecode) |
1191 | return 0; | |
cd54f6d9 MD |
1192 | /* Even is not connected to any description */ |
1193 | if (!event->desc) | |
1194 | return 0; | |
1195 | /* Bytecode already linked */ | |
1196 | if (event->filter || event->filter_data) | |
1197 | return 0; | |
2d78951a | 1198 | |
a8c27c7c | 1199 | dbg_printf("Linking\n"); |
cd54f6d9 MD |
1200 | |
1201 | /* We don't need the reloc table in the runtime */ | |
1202 | runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset; | |
1203 | runtime = zmalloc(runtime_alloc_len); | |
1204 | if (!runtime) { | |
1205 | ret = -ENOMEM; | |
1206 | goto link_error; | |
1207 | } | |
1208 | runtime->len = filter_bytecode->reloc_offset; | |
1209 | /* copy original bytecode */ | |
1210 | memcpy(runtime->data, filter_bytecode->data, runtime->len); | |
1211 | /* | |
1212 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
1213 | * followed by a string (field name). | |
1214 | */ | |
cd54f6d9 MD |
1215 | for (offset = filter_bytecode->reloc_offset; |
1216 | offset < filter_bytecode->len; | |
1217 | offset = next_offset) { | |
1218 | uint16_t reloc_offset = | |
1219 | *(uint16_t *) &filter_bytecode->data[offset]; | |
1220 | const char *field_name = | |
1221 | (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)]; | |
1222 | ||
1223 | ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name); | |
1224 | if (ret) { | |
1225 | goto link_error; | |
1226 | } | |
1227 | next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1; | |
1228 | } | |
9522a886 MD |
1229 | /* Validate bytecode */ |
1230 | ret = lttng_filter_validate_bytecode(runtime); | |
1231 | if (ret) { | |
1232 | goto link_error; | |
1233 | } | |
cd54f6d9 | 1234 | event->filter_data = runtime; |
2d78951a | 1235 | event->filter = lttng_filter_interpret_bytecode; |
2d78951a | 1236 | return 0; |
cd54f6d9 MD |
1237 | |
1238 | link_error: | |
1239 | event->filter = lttng_filter_false; | |
1240 | free(runtime); | |
1241 | return ret; | |
2d78951a MD |
1242 | } |
1243 | ||
1244 | void lttng_filter_event_link_bytecode(struct ltt_event *event, | |
1245 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1246 | { | |
1247 | int ret; | |
1248 | ||
cd54f6d9 | 1249 | ret = _lttng_filter_event_link_bytecode(event, filter_bytecode); |
2d78951a MD |
1250 | if (ret) { |
1251 | fprintf(stderr, "[lttng filter] error linking event bytecode\n"); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Link bytecode to all events for a wildcard. Skips events that already | |
1257 | * have a bytecode linked. | |
1258 | * We do not set each event's filter_bytecode field, because they do not | |
1259 | * own the filter_bytecode: the wildcard owns it. | |
1260 | */ | |
1261 | void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard) | |
1262 | { | |
1263 | struct ltt_event *event; | |
1264 | int ret; | |
1265 | ||
1266 | if (!wildcard->filter_bytecode) | |
1267 | return; | |
1268 | ||
1269 | cds_list_for_each_entry(event, &wildcard->events, wildcard_list) { | |
1270 | if (event->filter) | |
1271 | continue; | |
1272 | ret = _lttng_filter_event_link_bytecode(event, | |
1273 | wildcard->filter_bytecode); | |
1274 | if (ret) { | |
1275 | fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n"); | |
1276 | } | |
1277 | ||
1278 | } | |
1279 | return; | |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Need to attach filter to an event before starting tracing for the | |
cd54f6d9 | 1284 | * session. We own the filter_bytecode if we return success. |
2d78951a MD |
1285 | */ |
1286 | int lttng_filter_event_attach_bytecode(struct ltt_event *event, | |
1287 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1288 | { | |
2d78951a MD |
1289 | if (event->chan->session->been_active) |
1290 | return -EPERM; | |
1291 | if (event->filter_bytecode) | |
1292 | return -EEXIST; | |
cd54f6d9 | 1293 | event->filter_bytecode = filter_bytecode; |
2d78951a MD |
1294 | return 0; |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Need to attach filter to a wildcard before starting tracing for the | |
cd54f6d9 | 1299 | * session. We own the filter_bytecode if we return success. |
2d78951a MD |
1300 | */ |
1301 | int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard, | |
1302 | struct lttng_ust_filter_bytecode *filter_bytecode) | |
1303 | { | |
2d78951a MD |
1304 | if (wildcard->chan->session->been_active) |
1305 | return -EPERM; | |
1306 | if (wildcard->filter_bytecode) | |
1307 | return -EEXIST; | |
cd54f6d9 | 1308 | wildcard->filter_bytecode = filter_bytecode; |
2d78951a MD |
1309 | return 0; |
1310 | } |