Commit | Line | Data |
---|---|---|
07dfc1d0 MD |
1 | /* |
2 | * lttng-filter-interpreter.c | |
3 | * | |
4 | * LTTng modules filter interpreter. | |
5 | * | |
bbf3aef5 | 6 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
07dfc1d0 | 7 | * |
bbf3aef5 MD |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
07dfc1d0 | 14 | * |
bbf3aef5 MD |
15 | * The above copyright notice and this permission notice shall be included in |
16 | * all copies or substantial portions of the Software. | |
07dfc1d0 | 17 | * |
bbf3aef5 MD |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
24 | * SOFTWARE. | |
07dfc1d0 MD |
25 | */ |
26 | ||
f127e61e | 27 | #include <linux/uaccess.h> |
63155590 | 28 | #include <wrapper/frame.h> |
f127e61e | 29 | |
241ae9a8 | 30 | #include <lttng-filter.h> |
07dfc1d0 | 31 | |
63155590 MD |
32 | LTTNG_STACK_FRAME_NON_STANDARD(lttng_filter_interpret_bytecode); |
33 | ||
f127e61e MD |
34 | /* |
35 | * get_char should be called with page fault handler disabled if it is expected | |
36 | * to handle user-space read. | |
37 | */ | |
38 | static | |
39 | char get_char(struct estack_entry *reg, size_t offset) | |
40 | { | |
41 | if (unlikely(offset >= reg->u.s.seq_len)) | |
42 | return '\0'; | |
43 | if (reg->u.s.user) { | |
44 | char c; | |
45 | ||
46 | /* Handle invalid access as end of string. */ | |
47 | if (unlikely(!access_ok(VERIFY_READ, | |
48 | reg->u.s.user_str + offset, | |
49 | sizeof(c)))) | |
50 | return '\0'; | |
51 | /* Handle fault (nonzero return value) as end of string. */ | |
52 | if (unlikely(__copy_from_user_inatomic(&c, | |
53 | reg->u.s.user_str + offset, | |
54 | sizeof(c)))) | |
55 | return '\0'; | |
56 | return c; | |
57 | } else { | |
58 | return reg->u.s.str[offset]; | |
59 | } | |
60 | } | |
61 | ||
07dfc1d0 MD |
62 | /* |
63 | * -1: wildcard found. | |
64 | * -2: unknown escape char. | |
65 | * 0: normal char. | |
66 | */ | |
07dfc1d0 | 67 | static |
f127e61e | 68 | int parse_char(struct estack_entry *reg, char *c, size_t *offset) |
07dfc1d0 | 69 | { |
f127e61e | 70 | switch (*c) { |
07dfc1d0 | 71 | case '\\': |
f127e61e MD |
72 | (*offset)++; |
73 | *c = get_char(reg, *offset); | |
74 | switch (*c) { | |
07dfc1d0 MD |
75 | case '\\': |
76 | case '*': | |
77 | return 0; | |
78 | default: | |
79 | return -2; | |
80 | } | |
81 | case '*': | |
82 | return -1; | |
83 | default: | |
84 | return 0; | |
85 | } | |
86 | } | |
87 | ||
88 | static | |
89 | int stack_strcmp(struct estack *stack, int top, const char *cmp_type) | |
90 | { | |
f127e61e MD |
91 | size_t offset_bx = 0, offset_ax = 0; |
92 | int diff, has_user = 0; | |
93 | mm_segment_t old_fs; | |
94 | ||
95 | if (estack_bx(stack, top)->u.s.user | |
96 | || estack_ax(stack, top)->u.s.user) { | |
97 | has_user = 1; | |
98 | old_fs = get_fs(); | |
99 | set_fs(KERNEL_DS); | |
100 | pagefault_disable(); | |
101 | } | |
07dfc1d0 MD |
102 | |
103 | for (;;) { | |
f127e61e | 104 | int ret; |
07dfc1d0 | 105 | int escaped_r0 = 0; |
f127e61e | 106 | char char_bx, char_ax; |
07dfc1d0 | 107 | |
f127e61e MD |
108 | char_bx = get_char(estack_bx(stack, top), offset_bx); |
109 | char_ax = get_char(estack_ax(stack, top), offset_ax); | |
110 | ||
111 | if (unlikely(char_bx == '\0')) { | |
112 | if (char_ax == '\0') { | |
113 | diff = 0; | |
114 | break; | |
07dfc1d0 MD |
115 | } else { |
116 | if (estack_ax(stack, top)->u.s.literal) { | |
f127e61e MD |
117 | ret = parse_char(estack_ax(stack, top), |
118 | &char_ax, &offset_ax); | |
119 | if (ret == -1) { | |
120 | diff = 0; | |
121 | break; | |
122 | } | |
07dfc1d0 | 123 | } |
f127e61e MD |
124 | diff = -1; |
125 | break; | |
07dfc1d0 MD |
126 | } |
127 | } | |
f127e61e | 128 | if (unlikely(char_ax == '\0')) { |
abfd272b MD |
129 | if (estack_bx(stack, top)->u.s.literal) { |
130 | ret = parse_char(estack_bx(stack, top), | |
131 | &char_bx, &offset_bx); | |
132 | if (ret == -1) { | |
133 | diff = 0; | |
134 | break; | |
07dfc1d0 | 135 | } |
07dfc1d0 | 136 | } |
abfd272b MD |
137 | diff = 1; |
138 | break; | |
07dfc1d0 MD |
139 | } |
140 | if (estack_bx(stack, top)->u.s.literal) { | |
f127e61e MD |
141 | ret = parse_char(estack_bx(stack, top), |
142 | &char_bx, &offset_bx); | |
07dfc1d0 | 143 | if (ret == -1) { |
f127e61e MD |
144 | diff = 0; |
145 | break; | |
07dfc1d0 MD |
146 | } else if (ret == -2) { |
147 | escaped_r0 = 1; | |
148 | } | |
149 | /* else compare both char */ | |
150 | } | |
151 | if (estack_ax(stack, top)->u.s.literal) { | |
f127e61e MD |
152 | ret = parse_char(estack_ax(stack, top), |
153 | &char_ax, &offset_ax); | |
07dfc1d0 | 154 | if (ret == -1) { |
f127e61e MD |
155 | diff = 0; |
156 | break; | |
07dfc1d0 | 157 | } else if (ret == -2) { |
f127e61e MD |
158 | if (!escaped_r0) { |
159 | diff = -1; | |
160 | break; | |
161 | } | |
07dfc1d0 | 162 | } else { |
f127e61e MD |
163 | if (escaped_r0) { |
164 | diff = 1; | |
165 | break; | |
166 | } | |
07dfc1d0 MD |
167 | } |
168 | } else { | |
f127e61e MD |
169 | if (escaped_r0) { |
170 | diff = 1; | |
171 | break; | |
172 | } | |
07dfc1d0 | 173 | } |
f127e61e | 174 | diff = char_bx - char_ax; |
07dfc1d0 MD |
175 | if (diff != 0) |
176 | break; | |
f127e61e MD |
177 | offset_bx++; |
178 | offset_ax++; | |
179 | } | |
180 | if (has_user) { | |
181 | pagefault_enable(); | |
182 | set_fs(old_fs); | |
07dfc1d0 MD |
183 | } |
184 | return diff; | |
185 | } | |
186 | ||
187 | uint64_t lttng_filter_false(void *filter_data, | |
79150a49 | 188 | struct lttng_probe_ctx *lttng_probe_ctx, |
07dfc1d0 MD |
189 | const char *filter_stack_data) |
190 | { | |
191 | return 0; | |
192 | } | |
193 | ||
194 | #ifdef INTERPRETER_USE_SWITCH | |
195 | ||
196 | /* | |
197 | * Fallback for compilers that do not support taking address of labels. | |
198 | */ | |
199 | ||
200 | #define START_OP \ | |
201 | start_pc = &bytecode->data[0]; \ | |
202 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; \ | |
203 | pc = next_pc) { \ | |
204 | dbg_printk("Executing op %s (%u)\n", \ | |
205 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), \ | |
206 | (unsigned int) *(filter_opcode_t *) pc); \ | |
207 | switch (*(filter_opcode_t *) pc) { | |
208 | ||
209 | #define OP(name) case name | |
210 | ||
211 | #define PO break | |
212 | ||
213 | #define END_OP } \ | |
214 | } | |
215 | ||
216 | #else | |
217 | ||
218 | /* | |
219 | * Dispatch-table based interpreter. | |
220 | */ | |
221 | ||
222 | #define START_OP \ | |
223 | start_pc = &bytecode->data[0]; \ | |
224 | pc = next_pc = start_pc; \ | |
225 | if (unlikely(pc - start_pc >= bytecode->len)) \ | |
226 | goto end; \ | |
227 | goto *dispatch[*(filter_opcode_t *) pc]; | |
228 | ||
229 | #define OP(name) \ | |
230 | LABEL_##name | |
231 | ||
232 | #define PO \ | |
233 | pc = next_pc; \ | |
234 | goto *dispatch[*(filter_opcode_t *) pc]; | |
235 | ||
236 | #define END_OP | |
237 | ||
238 | #endif | |
239 | ||
240 | /* | |
241 | * Return 0 (discard), or raise the 0x1 flag (log event). | |
242 | * Currently, other flags are kept for future extensions and have no | |
243 | * effect. | |
244 | */ | |
245 | uint64_t lttng_filter_interpret_bytecode(void *filter_data, | |
79150a49 | 246 | struct lttng_probe_ctx *lttng_probe_ctx, |
07dfc1d0 MD |
247 | const char *filter_stack_data) |
248 | { | |
249 | struct bytecode_runtime *bytecode = filter_data; | |
250 | void *pc, *next_pc, *start_pc; | |
251 | int ret = -EINVAL; | |
252 | uint64_t retval = 0; | |
253 | struct estack _stack; | |
254 | struct estack *stack = &_stack; | |
255 | register int64_t ax = 0, bx = 0; | |
256 | register int top = FILTER_STACK_EMPTY; | |
257 | #ifndef INTERPRETER_USE_SWITCH | |
258 | static void *dispatch[NR_FILTER_OPS] = { | |
259 | [ FILTER_OP_UNKNOWN ] = &&LABEL_FILTER_OP_UNKNOWN, | |
260 | ||
261 | [ FILTER_OP_RETURN ] = &&LABEL_FILTER_OP_RETURN, | |
262 | ||
263 | /* binary */ | |
264 | [ FILTER_OP_MUL ] = &&LABEL_FILTER_OP_MUL, | |
265 | [ FILTER_OP_DIV ] = &&LABEL_FILTER_OP_DIV, | |
266 | [ FILTER_OP_MOD ] = &&LABEL_FILTER_OP_MOD, | |
267 | [ FILTER_OP_PLUS ] = &&LABEL_FILTER_OP_PLUS, | |
268 | [ FILTER_OP_MINUS ] = &&LABEL_FILTER_OP_MINUS, | |
269 | [ FILTER_OP_RSHIFT ] = &&LABEL_FILTER_OP_RSHIFT, | |
270 | [ FILTER_OP_LSHIFT ] = &&LABEL_FILTER_OP_LSHIFT, | |
271 | [ FILTER_OP_BIN_AND ] = &&LABEL_FILTER_OP_BIN_AND, | |
272 | [ FILTER_OP_BIN_OR ] = &&LABEL_FILTER_OP_BIN_OR, | |
273 | [ FILTER_OP_BIN_XOR ] = &&LABEL_FILTER_OP_BIN_XOR, | |
274 | ||
275 | /* binary comparators */ | |
276 | [ FILTER_OP_EQ ] = &&LABEL_FILTER_OP_EQ, | |
277 | [ FILTER_OP_NE ] = &&LABEL_FILTER_OP_NE, | |
278 | [ FILTER_OP_GT ] = &&LABEL_FILTER_OP_GT, | |
279 | [ FILTER_OP_LT ] = &&LABEL_FILTER_OP_LT, | |
280 | [ FILTER_OP_GE ] = &&LABEL_FILTER_OP_GE, | |
281 | [ FILTER_OP_LE ] = &&LABEL_FILTER_OP_LE, | |
282 | ||
283 | /* string binary comparator */ | |
284 | [ FILTER_OP_EQ_STRING ] = &&LABEL_FILTER_OP_EQ_STRING, | |
285 | [ FILTER_OP_NE_STRING ] = &&LABEL_FILTER_OP_NE_STRING, | |
286 | [ FILTER_OP_GT_STRING ] = &&LABEL_FILTER_OP_GT_STRING, | |
287 | [ FILTER_OP_LT_STRING ] = &&LABEL_FILTER_OP_LT_STRING, | |
288 | [ FILTER_OP_GE_STRING ] = &&LABEL_FILTER_OP_GE_STRING, | |
289 | [ FILTER_OP_LE_STRING ] = &&LABEL_FILTER_OP_LE_STRING, | |
290 | ||
291 | /* s64 binary comparator */ | |
292 | [ FILTER_OP_EQ_S64 ] = &&LABEL_FILTER_OP_EQ_S64, | |
293 | [ FILTER_OP_NE_S64 ] = &&LABEL_FILTER_OP_NE_S64, | |
294 | [ FILTER_OP_GT_S64 ] = &&LABEL_FILTER_OP_GT_S64, | |
295 | [ FILTER_OP_LT_S64 ] = &&LABEL_FILTER_OP_LT_S64, | |
296 | [ FILTER_OP_GE_S64 ] = &&LABEL_FILTER_OP_GE_S64, | |
297 | [ FILTER_OP_LE_S64 ] = &&LABEL_FILTER_OP_LE_S64, | |
298 | ||
299 | /* double binary comparator */ | |
300 | [ FILTER_OP_EQ_DOUBLE ] = &&LABEL_FILTER_OP_EQ_DOUBLE, | |
301 | [ FILTER_OP_NE_DOUBLE ] = &&LABEL_FILTER_OP_NE_DOUBLE, | |
302 | [ FILTER_OP_GT_DOUBLE ] = &&LABEL_FILTER_OP_GT_DOUBLE, | |
303 | [ FILTER_OP_LT_DOUBLE ] = &&LABEL_FILTER_OP_LT_DOUBLE, | |
304 | [ FILTER_OP_GE_DOUBLE ] = &&LABEL_FILTER_OP_GE_DOUBLE, | |
305 | [ FILTER_OP_LE_DOUBLE ] = &&LABEL_FILTER_OP_LE_DOUBLE, | |
306 | ||
307 | /* Mixed S64-double binary comparators */ | |
308 | [ FILTER_OP_EQ_DOUBLE_S64 ] = &&LABEL_FILTER_OP_EQ_DOUBLE_S64, | |
309 | [ FILTER_OP_NE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_NE_DOUBLE_S64, | |
310 | [ FILTER_OP_GT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GT_DOUBLE_S64, | |
311 | [ FILTER_OP_LT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LT_DOUBLE_S64, | |
312 | [ FILTER_OP_GE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GE_DOUBLE_S64, | |
313 | [ FILTER_OP_LE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LE_DOUBLE_S64, | |
314 | ||
315 | [ FILTER_OP_EQ_S64_DOUBLE ] = &&LABEL_FILTER_OP_EQ_S64_DOUBLE, | |
316 | [ FILTER_OP_NE_S64_DOUBLE ] = &&LABEL_FILTER_OP_NE_S64_DOUBLE, | |
317 | [ FILTER_OP_GT_S64_DOUBLE ] = &&LABEL_FILTER_OP_GT_S64_DOUBLE, | |
318 | [ FILTER_OP_LT_S64_DOUBLE ] = &&LABEL_FILTER_OP_LT_S64_DOUBLE, | |
319 | [ FILTER_OP_GE_S64_DOUBLE ] = &&LABEL_FILTER_OP_GE_S64_DOUBLE, | |
320 | [ FILTER_OP_LE_S64_DOUBLE ] = &&LABEL_FILTER_OP_LE_S64_DOUBLE, | |
321 | ||
322 | /* unary */ | |
323 | [ FILTER_OP_UNARY_PLUS ] = &&LABEL_FILTER_OP_UNARY_PLUS, | |
324 | [ FILTER_OP_UNARY_MINUS ] = &&LABEL_FILTER_OP_UNARY_MINUS, | |
325 | [ FILTER_OP_UNARY_NOT ] = &&LABEL_FILTER_OP_UNARY_NOT, | |
326 | [ FILTER_OP_UNARY_PLUS_S64 ] = &&LABEL_FILTER_OP_UNARY_PLUS_S64, | |
327 | [ FILTER_OP_UNARY_MINUS_S64 ] = &&LABEL_FILTER_OP_UNARY_MINUS_S64, | |
328 | [ FILTER_OP_UNARY_NOT_S64 ] = &&LABEL_FILTER_OP_UNARY_NOT_S64, | |
329 | [ FILTER_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_PLUS_DOUBLE, | |
330 | [ FILTER_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_MINUS_DOUBLE, | |
331 | [ FILTER_OP_UNARY_NOT_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_NOT_DOUBLE, | |
332 | ||
333 | /* logical */ | |
334 | [ FILTER_OP_AND ] = &&LABEL_FILTER_OP_AND, | |
335 | [ FILTER_OP_OR ] = &&LABEL_FILTER_OP_OR, | |
336 | ||
337 | /* load field ref */ | |
338 | [ FILTER_OP_LOAD_FIELD_REF ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF, | |
339 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_STRING, | |
340 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_SEQUENCE, | |
341 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_S64, | |
342 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_DOUBLE, | |
343 | ||
344 | /* load from immediate operand */ | |
345 | [ FILTER_OP_LOAD_STRING ] = &&LABEL_FILTER_OP_LOAD_STRING, | |
346 | [ FILTER_OP_LOAD_S64 ] = &&LABEL_FILTER_OP_LOAD_S64, | |
347 | [ FILTER_OP_LOAD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_DOUBLE, | |
348 | ||
349 | /* cast */ | |
350 | [ FILTER_OP_CAST_TO_S64 ] = &&LABEL_FILTER_OP_CAST_TO_S64, | |
351 | [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_FILTER_OP_CAST_DOUBLE_TO_S64, | |
352 | [ FILTER_OP_CAST_NOP ] = &&LABEL_FILTER_OP_CAST_NOP, | |
353 | ||
354 | /* get context ref */ | |
355 | [ FILTER_OP_GET_CONTEXT_REF ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF, | |
356 | [ FILTER_OP_GET_CONTEXT_REF_STRING ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_STRING, | |
357 | [ FILTER_OP_GET_CONTEXT_REF_S64 ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_S64, | |
358 | [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_DOUBLE, | |
f127e61e MD |
359 | |
360 | /* load userspace field ref */ | |
361 | [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_STRING, | |
362 | [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE, | |
07dfc1d0 MD |
363 | }; |
364 | #endif /* #ifndef INTERPRETER_USE_SWITCH */ | |
365 | ||
366 | START_OP | |
367 | ||
368 | OP(FILTER_OP_UNKNOWN): | |
369 | OP(FILTER_OP_LOAD_FIELD_REF): | |
370 | OP(FILTER_OP_GET_CONTEXT_REF): | |
371 | #ifdef INTERPRETER_USE_SWITCH | |
372 | default: | |
373 | #endif /* INTERPRETER_USE_SWITCH */ | |
374 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
375 | (unsigned int) *(filter_opcode_t *) pc); | |
376 | ret = -EINVAL; | |
377 | goto end; | |
378 | ||
379 | OP(FILTER_OP_RETURN): | |
380 | /* LTTNG_FILTER_DISCARD or LTTNG_FILTER_RECORD_FLAG */ | |
381 | retval = !!estack_ax_v; | |
382 | ret = 0; | |
383 | goto end; | |
384 | ||
385 | /* binary */ | |
386 | OP(FILTER_OP_MUL): | |
387 | OP(FILTER_OP_DIV): | |
388 | OP(FILTER_OP_MOD): | |
389 | OP(FILTER_OP_PLUS): | |
390 | OP(FILTER_OP_MINUS): | |
391 | OP(FILTER_OP_RSHIFT): | |
392 | OP(FILTER_OP_LSHIFT): | |
393 | OP(FILTER_OP_BIN_AND): | |
394 | OP(FILTER_OP_BIN_OR): | |
395 | OP(FILTER_OP_BIN_XOR): | |
396 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
397 | (unsigned int) *(filter_opcode_t *) pc); | |
398 | ret = -EINVAL; | |
399 | goto end; | |
400 | ||
401 | OP(FILTER_OP_EQ): | |
402 | OP(FILTER_OP_NE): | |
403 | OP(FILTER_OP_GT): | |
404 | OP(FILTER_OP_LT): | |
405 | OP(FILTER_OP_GE): | |
406 | OP(FILTER_OP_LE): | |
407 | printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n", | |
408 | (unsigned int) *(filter_opcode_t *) pc); | |
409 | ret = -EINVAL; | |
410 | goto end; | |
411 | ||
412 | OP(FILTER_OP_EQ_STRING): | |
413 | { | |
414 | int res; | |
415 | ||
416 | res = (stack_strcmp(stack, top, "==") == 0); | |
417 | estack_pop(stack, top, ax, bx); | |
418 | estack_ax_v = res; | |
419 | next_pc += sizeof(struct binary_op); | |
420 | PO; | |
421 | } | |
422 | OP(FILTER_OP_NE_STRING): | |
423 | { | |
424 | int res; | |
425 | ||
426 | res = (stack_strcmp(stack, top, "!=") != 0); | |
427 | estack_pop(stack, top, ax, bx); | |
428 | estack_ax_v = res; | |
429 | next_pc += sizeof(struct binary_op); | |
430 | PO; | |
431 | } | |
432 | OP(FILTER_OP_GT_STRING): | |
433 | { | |
434 | int res; | |
435 | ||
436 | res = (stack_strcmp(stack, top, ">") > 0); | |
437 | estack_pop(stack, top, ax, bx); | |
438 | estack_ax_v = res; | |
439 | next_pc += sizeof(struct binary_op); | |
440 | PO; | |
441 | } | |
442 | OP(FILTER_OP_LT_STRING): | |
443 | { | |
444 | int res; | |
445 | ||
446 | res = (stack_strcmp(stack, top, "<") < 0); | |
447 | estack_pop(stack, top, ax, bx); | |
448 | estack_ax_v = res; | |
449 | next_pc += sizeof(struct binary_op); | |
450 | PO; | |
451 | } | |
452 | OP(FILTER_OP_GE_STRING): | |
453 | { | |
454 | int res; | |
455 | ||
456 | res = (stack_strcmp(stack, top, ">=") >= 0); | |
457 | estack_pop(stack, top, ax, bx); | |
458 | estack_ax_v = res; | |
459 | next_pc += sizeof(struct binary_op); | |
460 | PO; | |
461 | } | |
462 | OP(FILTER_OP_LE_STRING): | |
463 | { | |
464 | int res; | |
465 | ||
466 | res = (stack_strcmp(stack, top, "<=") <= 0); | |
467 | estack_pop(stack, top, ax, bx); | |
468 | estack_ax_v = res; | |
469 | next_pc += sizeof(struct binary_op); | |
470 | PO; | |
471 | } | |
472 | ||
473 | OP(FILTER_OP_EQ_S64): | |
474 | { | |
475 | int res; | |
476 | ||
477 | res = (estack_bx_v == estack_ax_v); | |
478 | estack_pop(stack, top, ax, bx); | |
479 | estack_ax_v = res; | |
480 | next_pc += sizeof(struct binary_op); | |
481 | PO; | |
482 | } | |
483 | OP(FILTER_OP_NE_S64): | |
484 | { | |
485 | int res; | |
486 | ||
487 | res = (estack_bx_v != estack_ax_v); | |
488 | estack_pop(stack, top, ax, bx); | |
489 | estack_ax_v = res; | |
490 | next_pc += sizeof(struct binary_op); | |
491 | PO; | |
492 | } | |
493 | OP(FILTER_OP_GT_S64): | |
494 | { | |
495 | int res; | |
496 | ||
497 | res = (estack_bx_v > estack_ax_v); | |
498 | estack_pop(stack, top, ax, bx); | |
499 | estack_ax_v = res; | |
500 | next_pc += sizeof(struct binary_op); | |
501 | PO; | |
502 | } | |
503 | OP(FILTER_OP_LT_S64): | |
504 | { | |
505 | int res; | |
506 | ||
507 | res = (estack_bx_v < estack_ax_v); | |
508 | estack_pop(stack, top, ax, bx); | |
509 | estack_ax_v = res; | |
510 | next_pc += sizeof(struct binary_op); | |
511 | PO; | |
512 | } | |
513 | OP(FILTER_OP_GE_S64): | |
514 | { | |
515 | int res; | |
516 | ||
517 | res = (estack_bx_v >= estack_ax_v); | |
518 | estack_pop(stack, top, ax, bx); | |
519 | estack_ax_v = res; | |
520 | next_pc += sizeof(struct binary_op); | |
521 | PO; | |
522 | } | |
523 | OP(FILTER_OP_LE_S64): | |
524 | { | |
525 | int res; | |
526 | ||
527 | res = (estack_bx_v <= estack_ax_v); | |
528 | estack_pop(stack, top, ax, bx); | |
529 | estack_ax_v = res; | |
530 | next_pc += sizeof(struct binary_op); | |
531 | PO; | |
532 | } | |
533 | ||
534 | OP(FILTER_OP_EQ_DOUBLE): | |
535 | OP(FILTER_OP_NE_DOUBLE): | |
536 | OP(FILTER_OP_GT_DOUBLE): | |
537 | OP(FILTER_OP_LT_DOUBLE): | |
538 | OP(FILTER_OP_GE_DOUBLE): | |
539 | OP(FILTER_OP_LE_DOUBLE): | |
540 | { | |
541 | BUG_ON(1); | |
542 | PO; | |
543 | } | |
544 | ||
545 | /* Mixed S64-double binary comparators */ | |
546 | OP(FILTER_OP_EQ_DOUBLE_S64): | |
547 | OP(FILTER_OP_NE_DOUBLE_S64): | |
548 | OP(FILTER_OP_GT_DOUBLE_S64): | |
549 | OP(FILTER_OP_LT_DOUBLE_S64): | |
550 | OP(FILTER_OP_GE_DOUBLE_S64): | |
551 | OP(FILTER_OP_LE_DOUBLE_S64): | |
552 | OP(FILTER_OP_EQ_S64_DOUBLE): | |
553 | OP(FILTER_OP_NE_S64_DOUBLE): | |
554 | OP(FILTER_OP_GT_S64_DOUBLE): | |
555 | OP(FILTER_OP_LT_S64_DOUBLE): | |
556 | OP(FILTER_OP_GE_S64_DOUBLE): | |
557 | OP(FILTER_OP_LE_S64_DOUBLE): | |
558 | { | |
559 | BUG_ON(1); | |
560 | PO; | |
561 | } | |
562 | ||
563 | /* unary */ | |
564 | OP(FILTER_OP_UNARY_PLUS): | |
565 | OP(FILTER_OP_UNARY_MINUS): | |
566 | OP(FILTER_OP_UNARY_NOT): | |
567 | printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n", | |
568 | (unsigned int) *(filter_opcode_t *) pc); | |
569 | ret = -EINVAL; | |
570 | goto end; | |
571 | ||
572 | ||
573 | OP(FILTER_OP_UNARY_PLUS_S64): | |
574 | { | |
575 | next_pc += sizeof(struct unary_op); | |
576 | PO; | |
577 | } | |
578 | OP(FILTER_OP_UNARY_MINUS_S64): | |
579 | { | |
580 | estack_ax_v = -estack_ax_v; | |
581 | next_pc += sizeof(struct unary_op); | |
582 | PO; | |
583 | } | |
584 | OP(FILTER_OP_UNARY_PLUS_DOUBLE): | |
585 | OP(FILTER_OP_UNARY_MINUS_DOUBLE): | |
586 | { | |
587 | BUG_ON(1); | |
588 | PO; | |
589 | } | |
590 | OP(FILTER_OP_UNARY_NOT_S64): | |
591 | { | |
592 | estack_ax_v = !estack_ax_v; | |
593 | next_pc += sizeof(struct unary_op); | |
594 | PO; | |
595 | } | |
596 | OP(FILTER_OP_UNARY_NOT_DOUBLE): | |
597 | { | |
598 | BUG_ON(1); | |
599 | PO; | |
600 | } | |
601 | ||
602 | /* logical */ | |
603 | OP(FILTER_OP_AND): | |
604 | { | |
605 | struct logical_op *insn = (struct logical_op *) pc; | |
606 | ||
607 | /* If AX is 0, skip and evaluate to 0 */ | |
608 | if (unlikely(estack_ax_v == 0)) { | |
609 | dbg_printk("Jumping to bytecode offset %u\n", | |
610 | (unsigned int) insn->skip_offset); | |
611 | next_pc = start_pc + insn->skip_offset; | |
612 | } else { | |
613 | /* Pop 1 when jump not taken */ | |
614 | estack_pop(stack, top, ax, bx); | |
615 | next_pc += sizeof(struct logical_op); | |
616 | } | |
617 | PO; | |
618 | } | |
619 | OP(FILTER_OP_OR): | |
620 | { | |
621 | struct logical_op *insn = (struct logical_op *) pc; | |
622 | ||
623 | /* If AX is nonzero, skip and evaluate to 1 */ | |
624 | ||
625 | if (unlikely(estack_ax_v != 0)) { | |
626 | estack_ax_v = 1; | |
627 | dbg_printk("Jumping to bytecode offset %u\n", | |
628 | (unsigned int) insn->skip_offset); | |
629 | next_pc = start_pc + insn->skip_offset; | |
630 | } else { | |
631 | /* Pop 1 when jump not taken */ | |
632 | estack_pop(stack, top, ax, bx); | |
633 | next_pc += sizeof(struct logical_op); | |
634 | } | |
635 | PO; | |
636 | } | |
637 | ||
638 | ||
639 | /* load field ref */ | |
640 | OP(FILTER_OP_LOAD_FIELD_REF_STRING): | |
641 | { | |
642 | struct load_op *insn = (struct load_op *) pc; | |
643 | struct field_ref *ref = (struct field_ref *) insn->data; | |
644 | ||
645 | dbg_printk("load field ref offset %u type string\n", | |
646 | ref->offset); | |
647 | estack_push(stack, top, ax, bx); | |
648 | estack_ax(stack, top)->u.s.str = | |
649 | *(const char * const *) &filter_stack_data[ref->offset]; | |
650 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
651 | dbg_printk("Filter warning: loading a NULL string.\n"); | |
652 | ret = -EINVAL; | |
653 | goto end; | |
654 | } | |
655 | estack_ax(stack, top)->u.s.seq_len = UINT_MAX; | |
656 | estack_ax(stack, top)->u.s.literal = 0; | |
f127e61e | 657 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
658 | dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str); |
659 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
660 | PO; | |
661 | } | |
662 | ||
663 | OP(FILTER_OP_LOAD_FIELD_REF_SEQUENCE): | |
664 | { | |
665 | struct load_op *insn = (struct load_op *) pc; | |
666 | struct field_ref *ref = (struct field_ref *) insn->data; | |
667 | ||
668 | dbg_printk("load field ref offset %u type sequence\n", | |
669 | ref->offset); | |
670 | estack_push(stack, top, ax, bx); | |
671 | estack_ax(stack, top)->u.s.seq_len = | |
672 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
673 | estack_ax(stack, top)->u.s.str = | |
674 | *(const char **) (&filter_stack_data[ref->offset | |
675 | + sizeof(unsigned long)]); | |
676 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
677 | dbg_printk("Filter warning: loading a NULL sequence.\n"); | |
678 | ret = -EINVAL; | |
679 | goto end; | |
680 | } | |
681 | estack_ax(stack, top)->u.s.literal = 0; | |
f127e61e | 682 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
683 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
684 | PO; | |
685 | } | |
686 | ||
687 | OP(FILTER_OP_LOAD_FIELD_REF_S64): | |
688 | { | |
689 | struct load_op *insn = (struct load_op *) pc; | |
690 | struct field_ref *ref = (struct field_ref *) insn->data; | |
691 | ||
692 | dbg_printk("load field ref offset %u type s64\n", | |
693 | ref->offset); | |
694 | estack_push(stack, top, ax, bx); | |
695 | estack_ax_v = | |
696 | ((struct literal_numeric *) &filter_stack_data[ref->offset])->v; | |
697 | dbg_printk("ref load s64 %lld\n", | |
698 | (long long) estack_ax_v); | |
699 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
700 | PO; | |
701 | } | |
702 | ||
703 | OP(FILTER_OP_LOAD_FIELD_REF_DOUBLE): | |
704 | { | |
705 | BUG_ON(1); | |
706 | PO; | |
707 | } | |
708 | ||
709 | /* load from immediate operand */ | |
710 | OP(FILTER_OP_LOAD_STRING): | |
711 | { | |
712 | struct load_op *insn = (struct load_op *) pc; | |
713 | ||
714 | dbg_printk("load string %s\n", insn->data); | |
715 | estack_push(stack, top, ax, bx); | |
716 | estack_ax(stack, top)->u.s.str = insn->data; | |
717 | estack_ax(stack, top)->u.s.seq_len = UINT_MAX; | |
718 | estack_ax(stack, top)->u.s.literal = 1; | |
f127e61e | 719 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
720 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
721 | PO; | |
722 | } | |
723 | ||
724 | OP(FILTER_OP_LOAD_S64): | |
725 | { | |
726 | struct load_op *insn = (struct load_op *) pc; | |
727 | ||
728 | estack_push(stack, top, ax, bx); | |
729 | estack_ax_v = ((struct literal_numeric *) insn->data)->v; | |
730 | dbg_printk("load s64 %lld\n", | |
731 | (long long) estack_ax_v); | |
732 | next_pc += sizeof(struct load_op) | |
733 | + sizeof(struct literal_numeric); | |
734 | PO; | |
735 | } | |
736 | ||
737 | OP(FILTER_OP_LOAD_DOUBLE): | |
738 | { | |
739 | BUG_ON(1); | |
740 | PO; | |
741 | } | |
742 | ||
743 | /* cast */ | |
744 | OP(FILTER_OP_CAST_TO_S64): | |
745 | printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n", | |
746 | (unsigned int) *(filter_opcode_t *) pc); | |
747 | ret = -EINVAL; | |
748 | goto end; | |
749 | ||
750 | OP(FILTER_OP_CAST_DOUBLE_TO_S64): | |
751 | { | |
752 | BUG_ON(1); | |
753 | PO; | |
754 | } | |
755 | ||
756 | OP(FILTER_OP_CAST_NOP): | |
757 | { | |
758 | next_pc += sizeof(struct cast_op); | |
759 | PO; | |
760 | } | |
761 | ||
762 | /* get context ref */ | |
763 | OP(FILTER_OP_GET_CONTEXT_REF_STRING): | |
764 | { | |
765 | struct load_op *insn = (struct load_op *) pc; | |
766 | struct field_ref *ref = (struct field_ref *) insn->data; | |
767 | struct lttng_ctx_field *ctx_field; | |
768 | union lttng_ctx_value v; | |
769 | ||
770 | dbg_printk("get context ref offset %u type string\n", | |
771 | ref->offset); | |
772 | ctx_field = <tng_static_ctx->fields[ref->offset]; | |
79150a49 | 773 | ctx_field->get_value(ctx_field, lttng_probe_ctx, &v); |
07dfc1d0 MD |
774 | estack_push(stack, top, ax, bx); |
775 | estack_ax(stack, top)->u.s.str = v.str; | |
776 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
777 | dbg_printk("Filter warning: loading a NULL string.\n"); | |
778 | ret = -EINVAL; | |
779 | goto end; | |
780 | } | |
781 | estack_ax(stack, top)->u.s.seq_len = UINT_MAX; | |
782 | estack_ax(stack, top)->u.s.literal = 0; | |
f127e61e | 783 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
784 | dbg_printk("ref get context string %s\n", estack_ax(stack, top)->u.s.str); |
785 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
786 | PO; | |
787 | } | |
788 | ||
789 | OP(FILTER_OP_GET_CONTEXT_REF_S64): | |
790 | { | |
791 | struct load_op *insn = (struct load_op *) pc; | |
792 | struct field_ref *ref = (struct field_ref *) insn->data; | |
793 | struct lttng_ctx_field *ctx_field; | |
794 | union lttng_ctx_value v; | |
795 | ||
796 | dbg_printk("get context ref offset %u type s64\n", | |
797 | ref->offset); | |
798 | ctx_field = <tng_static_ctx->fields[ref->offset]; | |
79150a49 | 799 | ctx_field->get_value(ctx_field, lttng_probe_ctx, &v); |
07dfc1d0 MD |
800 | estack_push(stack, top, ax, bx); |
801 | estack_ax_v = v.s64; | |
802 | dbg_printk("ref get context s64 %lld\n", | |
803 | (long long) estack_ax_v); | |
804 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
805 | PO; | |
806 | } | |
807 | ||
808 | OP(FILTER_OP_GET_CONTEXT_REF_DOUBLE): | |
809 | { | |
810 | BUG_ON(1); | |
811 | PO; | |
812 | } | |
813 | ||
f127e61e MD |
814 | /* load userspace field ref */ |
815 | OP(FILTER_OP_LOAD_FIELD_REF_USER_STRING): | |
816 | { | |
817 | struct load_op *insn = (struct load_op *) pc; | |
818 | struct field_ref *ref = (struct field_ref *) insn->data; | |
819 | ||
820 | dbg_printk("load field ref offset %u type user string\n", | |
821 | ref->offset); | |
822 | estack_push(stack, top, ax, bx); | |
5b4ad89f | 823 | estack_ax(stack, top)->u.s.user_str = |
f127e61e MD |
824 | *(const char * const *) &filter_stack_data[ref->offset]; |
825 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
826 | dbg_printk("Filter warning: loading a NULL string.\n"); | |
827 | ret = -EINVAL; | |
828 | goto end; | |
829 | } | |
830 | estack_ax(stack, top)->u.s.seq_len = UINT_MAX; | |
831 | estack_ax(stack, top)->u.s.literal = 0; | |
832 | estack_ax(stack, top)->u.s.user = 1; | |
833 | dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str); | |
834 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
835 | PO; | |
836 | } | |
837 | ||
838 | OP(FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE): | |
839 | { | |
840 | struct load_op *insn = (struct load_op *) pc; | |
841 | struct field_ref *ref = (struct field_ref *) insn->data; | |
842 | ||
843 | dbg_printk("load field ref offset %u type user sequence\n", | |
844 | ref->offset); | |
845 | estack_push(stack, top, ax, bx); | |
846 | estack_ax(stack, top)->u.s.seq_len = | |
847 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
5b4ad89f | 848 | estack_ax(stack, top)->u.s.user_str = |
f127e61e MD |
849 | *(const char **) (&filter_stack_data[ref->offset |
850 | + sizeof(unsigned long)]); | |
851 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
852 | dbg_printk("Filter warning: loading a NULL sequence.\n"); | |
853 | ret = -EINVAL; | |
854 | goto end; | |
855 | } | |
856 | estack_ax(stack, top)->u.s.literal = 0; | |
857 | estack_ax(stack, top)->u.s.user = 1; | |
858 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
859 | PO; | |
860 | } | |
861 | ||
07dfc1d0 MD |
862 | END_OP |
863 | end: | |
864 | /* return 0 (discard) on error */ | |
865 | if (ret) | |
866 | return 0; | |
867 | return retval; | |
868 | } | |
869 | ||
870 | #undef START_OP | |
871 | #undef OP | |
872 | #undef PO | |
873 | #undef END_OP |