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> |
02aca193 | 31 | #include <lttng-string-utils.h> |
07dfc1d0 | 32 | |
63155590 MD |
33 | LTTNG_STACK_FRAME_NON_STANDARD(lttng_filter_interpret_bytecode); |
34 | ||
f127e61e MD |
35 | /* |
36 | * get_char should be called with page fault handler disabled if it is expected | |
37 | * to handle user-space read. | |
38 | */ | |
39 | static | |
40 | char get_char(struct estack_entry *reg, size_t offset) | |
41 | { | |
42 | if (unlikely(offset >= reg->u.s.seq_len)) | |
43 | return '\0'; | |
44 | if (reg->u.s.user) { | |
45 | char c; | |
46 | ||
47 | /* Handle invalid access as end of string. */ | |
48 | if (unlikely(!access_ok(VERIFY_READ, | |
49 | reg->u.s.user_str + offset, | |
50 | sizeof(c)))) | |
51 | return '\0'; | |
52 | /* Handle fault (nonzero return value) as end of string. */ | |
53 | if (unlikely(__copy_from_user_inatomic(&c, | |
54 | reg->u.s.user_str + offset, | |
55 | sizeof(c)))) | |
56 | return '\0'; | |
57 | return c; | |
58 | } else { | |
59 | return reg->u.s.str[offset]; | |
60 | } | |
61 | } | |
62 | ||
07dfc1d0 MD |
63 | /* |
64 | * -1: wildcard found. | |
65 | * -2: unknown escape char. | |
66 | * 0: normal char. | |
67 | */ | |
07dfc1d0 | 68 | static |
f127e61e | 69 | int parse_char(struct estack_entry *reg, char *c, size_t *offset) |
07dfc1d0 | 70 | { |
f127e61e | 71 | switch (*c) { |
07dfc1d0 | 72 | case '\\': |
f127e61e MD |
73 | (*offset)++; |
74 | *c = get_char(reg, *offset); | |
75 | switch (*c) { | |
07dfc1d0 MD |
76 | case '\\': |
77 | case '*': | |
78 | return 0; | |
79 | default: | |
80 | return -2; | |
81 | } | |
82 | case '*': | |
83 | return -1; | |
84 | default: | |
85 | return 0; | |
86 | } | |
87 | } | |
88 | ||
02aca193 PP |
89 | static |
90 | char get_char_at_cb(size_t at, void *data) | |
91 | { | |
92 | return get_char(data, at); | |
93 | } | |
94 | ||
95 | static | |
96 | int stack_star_glob_match(struct estack *stack, int top, const char *cmp_type) | |
97 | { | |
98 | bool has_user = false; | |
99 | mm_segment_t old_fs; | |
100 | int result; | |
101 | struct estack_entry *pattern_reg; | |
102 | struct estack_entry *candidate_reg; | |
103 | ||
104 | if (estack_bx(stack, top)->u.s.user | |
105 | || estack_ax(stack, top)->u.s.user) { | |
106 | has_user = true; | |
107 | old_fs = get_fs(); | |
108 | set_fs(KERNEL_DS); | |
109 | pagefault_disable(); | |
110 | } | |
111 | ||
112 | /* Find out which side is the pattern vs. the candidate. */ | |
113 | if (estack_ax(stack, top)->u.s.literal_type == ESTACK_STRING_LITERAL_TYPE_STAR_GLOB) { | |
114 | pattern_reg = estack_ax(stack, top); | |
115 | candidate_reg = estack_bx(stack, top); | |
116 | } else { | |
117 | pattern_reg = estack_bx(stack, top); | |
118 | candidate_reg = estack_ax(stack, top); | |
119 | } | |
120 | ||
121 | /* Perform the match operation. */ | |
122 | result = !strutils_star_glob_match_char_cb(get_char_at_cb, | |
123 | pattern_reg, get_char_at_cb, candidate_reg); | |
124 | if (has_user) { | |
125 | pagefault_enable(); | |
126 | set_fs(old_fs); | |
127 | } | |
128 | ||
129 | return result; | |
130 | } | |
131 | ||
07dfc1d0 MD |
132 | static |
133 | int stack_strcmp(struct estack *stack, int top, const char *cmp_type) | |
134 | { | |
f127e61e MD |
135 | size_t offset_bx = 0, offset_ax = 0; |
136 | int diff, has_user = 0; | |
137 | mm_segment_t old_fs; | |
138 | ||
139 | if (estack_bx(stack, top)->u.s.user | |
140 | || estack_ax(stack, top)->u.s.user) { | |
141 | has_user = 1; | |
142 | old_fs = get_fs(); | |
143 | set_fs(KERNEL_DS); | |
144 | pagefault_disable(); | |
145 | } | |
07dfc1d0 MD |
146 | |
147 | for (;;) { | |
f127e61e | 148 | int ret; |
07dfc1d0 | 149 | int escaped_r0 = 0; |
f127e61e | 150 | char char_bx, char_ax; |
07dfc1d0 | 151 | |
f127e61e MD |
152 | char_bx = get_char(estack_bx(stack, top), offset_bx); |
153 | char_ax = get_char(estack_ax(stack, top), offset_ax); | |
154 | ||
155 | if (unlikely(char_bx == '\0')) { | |
156 | if (char_ax == '\0') { | |
157 | diff = 0; | |
158 | break; | |
07dfc1d0 | 159 | } else { |
02aca193 PP |
160 | if (estack_ax(stack, top)->u.s.literal_type == |
161 | ESTACK_STRING_LITERAL_TYPE_PLAIN) { | |
f127e61e MD |
162 | ret = parse_char(estack_ax(stack, top), |
163 | &char_ax, &offset_ax); | |
164 | if (ret == -1) { | |
165 | diff = 0; | |
166 | break; | |
167 | } | |
07dfc1d0 | 168 | } |
f127e61e MD |
169 | diff = -1; |
170 | break; | |
07dfc1d0 MD |
171 | } |
172 | } | |
f127e61e | 173 | if (unlikely(char_ax == '\0')) { |
02aca193 PP |
174 | if (estack_bx(stack, top)->u.s.literal_type == |
175 | ESTACK_STRING_LITERAL_TYPE_PLAIN) { | |
abfd272b MD |
176 | ret = parse_char(estack_bx(stack, top), |
177 | &char_bx, &offset_bx); | |
178 | if (ret == -1) { | |
179 | diff = 0; | |
180 | break; | |
07dfc1d0 | 181 | } |
07dfc1d0 | 182 | } |
abfd272b MD |
183 | diff = 1; |
184 | break; | |
07dfc1d0 | 185 | } |
02aca193 PP |
186 | if (estack_bx(stack, top)->u.s.literal_type == |
187 | ESTACK_STRING_LITERAL_TYPE_PLAIN) { | |
f127e61e MD |
188 | ret = parse_char(estack_bx(stack, top), |
189 | &char_bx, &offset_bx); | |
07dfc1d0 | 190 | if (ret == -1) { |
f127e61e MD |
191 | diff = 0; |
192 | break; | |
07dfc1d0 MD |
193 | } else if (ret == -2) { |
194 | escaped_r0 = 1; | |
195 | } | |
196 | /* else compare both char */ | |
197 | } | |
02aca193 PP |
198 | if (estack_ax(stack, top)->u.s.literal_type == |
199 | ESTACK_STRING_LITERAL_TYPE_PLAIN) { | |
f127e61e MD |
200 | ret = parse_char(estack_ax(stack, top), |
201 | &char_ax, &offset_ax); | |
07dfc1d0 | 202 | if (ret == -1) { |
f127e61e MD |
203 | diff = 0; |
204 | break; | |
07dfc1d0 | 205 | } else if (ret == -2) { |
f127e61e MD |
206 | if (!escaped_r0) { |
207 | diff = -1; | |
208 | break; | |
209 | } | |
07dfc1d0 | 210 | } else { |
f127e61e MD |
211 | if (escaped_r0) { |
212 | diff = 1; | |
213 | break; | |
214 | } | |
07dfc1d0 MD |
215 | } |
216 | } else { | |
f127e61e MD |
217 | if (escaped_r0) { |
218 | diff = 1; | |
219 | break; | |
220 | } | |
07dfc1d0 | 221 | } |
f127e61e | 222 | diff = char_bx - char_ax; |
07dfc1d0 MD |
223 | if (diff != 0) |
224 | break; | |
f127e61e MD |
225 | offset_bx++; |
226 | offset_ax++; | |
227 | } | |
228 | if (has_user) { | |
229 | pagefault_enable(); | |
230 | set_fs(old_fs); | |
07dfc1d0 MD |
231 | } |
232 | return diff; | |
233 | } | |
234 | ||
235 | uint64_t lttng_filter_false(void *filter_data, | |
79150a49 | 236 | struct lttng_probe_ctx *lttng_probe_ctx, |
07dfc1d0 MD |
237 | const char *filter_stack_data) |
238 | { | |
239 | return 0; | |
240 | } | |
241 | ||
242 | #ifdef INTERPRETER_USE_SWITCH | |
243 | ||
244 | /* | |
245 | * Fallback for compilers that do not support taking address of labels. | |
246 | */ | |
247 | ||
248 | #define START_OP \ | |
249 | start_pc = &bytecode->data[0]; \ | |
250 | for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; \ | |
251 | pc = next_pc) { \ | |
252 | dbg_printk("Executing op %s (%u)\n", \ | |
253 | lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), \ | |
254 | (unsigned int) *(filter_opcode_t *) pc); \ | |
255 | switch (*(filter_opcode_t *) pc) { | |
256 | ||
257 | #define OP(name) case name | |
258 | ||
259 | #define PO break | |
260 | ||
261 | #define END_OP } \ | |
262 | } | |
263 | ||
264 | #else | |
265 | ||
266 | /* | |
267 | * Dispatch-table based interpreter. | |
268 | */ | |
269 | ||
270 | #define START_OP \ | |
271 | start_pc = &bytecode->data[0]; \ | |
272 | pc = next_pc = start_pc; \ | |
273 | if (unlikely(pc - start_pc >= bytecode->len)) \ | |
274 | goto end; \ | |
275 | goto *dispatch[*(filter_opcode_t *) pc]; | |
276 | ||
277 | #define OP(name) \ | |
278 | LABEL_##name | |
279 | ||
280 | #define PO \ | |
281 | pc = next_pc; \ | |
282 | goto *dispatch[*(filter_opcode_t *) pc]; | |
283 | ||
284 | #define END_OP | |
285 | ||
286 | #endif | |
287 | ||
288 | /* | |
289 | * Return 0 (discard), or raise the 0x1 flag (log event). | |
290 | * Currently, other flags are kept for future extensions and have no | |
291 | * effect. | |
292 | */ | |
293 | uint64_t lttng_filter_interpret_bytecode(void *filter_data, | |
79150a49 | 294 | struct lttng_probe_ctx *lttng_probe_ctx, |
07dfc1d0 MD |
295 | const char *filter_stack_data) |
296 | { | |
297 | struct bytecode_runtime *bytecode = filter_data; | |
298 | void *pc, *next_pc, *start_pc; | |
299 | int ret = -EINVAL; | |
300 | uint64_t retval = 0; | |
301 | struct estack _stack; | |
302 | struct estack *stack = &_stack; | |
303 | register int64_t ax = 0, bx = 0; | |
304 | register int top = FILTER_STACK_EMPTY; | |
305 | #ifndef INTERPRETER_USE_SWITCH | |
306 | static void *dispatch[NR_FILTER_OPS] = { | |
307 | [ FILTER_OP_UNKNOWN ] = &&LABEL_FILTER_OP_UNKNOWN, | |
308 | ||
309 | [ FILTER_OP_RETURN ] = &&LABEL_FILTER_OP_RETURN, | |
310 | ||
311 | /* binary */ | |
312 | [ FILTER_OP_MUL ] = &&LABEL_FILTER_OP_MUL, | |
313 | [ FILTER_OP_DIV ] = &&LABEL_FILTER_OP_DIV, | |
314 | [ FILTER_OP_MOD ] = &&LABEL_FILTER_OP_MOD, | |
315 | [ FILTER_OP_PLUS ] = &&LABEL_FILTER_OP_PLUS, | |
316 | [ FILTER_OP_MINUS ] = &&LABEL_FILTER_OP_MINUS, | |
317 | [ FILTER_OP_RSHIFT ] = &&LABEL_FILTER_OP_RSHIFT, | |
318 | [ FILTER_OP_LSHIFT ] = &&LABEL_FILTER_OP_LSHIFT, | |
319 | [ FILTER_OP_BIN_AND ] = &&LABEL_FILTER_OP_BIN_AND, | |
320 | [ FILTER_OP_BIN_OR ] = &&LABEL_FILTER_OP_BIN_OR, | |
321 | [ FILTER_OP_BIN_XOR ] = &&LABEL_FILTER_OP_BIN_XOR, | |
322 | ||
323 | /* binary comparators */ | |
324 | [ FILTER_OP_EQ ] = &&LABEL_FILTER_OP_EQ, | |
325 | [ FILTER_OP_NE ] = &&LABEL_FILTER_OP_NE, | |
326 | [ FILTER_OP_GT ] = &&LABEL_FILTER_OP_GT, | |
327 | [ FILTER_OP_LT ] = &&LABEL_FILTER_OP_LT, | |
328 | [ FILTER_OP_GE ] = &&LABEL_FILTER_OP_GE, | |
329 | [ FILTER_OP_LE ] = &&LABEL_FILTER_OP_LE, | |
330 | ||
331 | /* string binary comparator */ | |
332 | [ FILTER_OP_EQ_STRING ] = &&LABEL_FILTER_OP_EQ_STRING, | |
333 | [ FILTER_OP_NE_STRING ] = &&LABEL_FILTER_OP_NE_STRING, | |
334 | [ FILTER_OP_GT_STRING ] = &&LABEL_FILTER_OP_GT_STRING, | |
335 | [ FILTER_OP_LT_STRING ] = &&LABEL_FILTER_OP_LT_STRING, | |
336 | [ FILTER_OP_GE_STRING ] = &&LABEL_FILTER_OP_GE_STRING, | |
337 | [ FILTER_OP_LE_STRING ] = &&LABEL_FILTER_OP_LE_STRING, | |
338 | ||
02aca193 PP |
339 | /* globbing pattern binary comparator */ |
340 | [ FILTER_OP_EQ_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_EQ_STAR_GLOB_STRING, | |
341 | [ FILTER_OP_NE_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_NE_STAR_GLOB_STRING, | |
342 | ||
07dfc1d0 MD |
343 | /* s64 binary comparator */ |
344 | [ FILTER_OP_EQ_S64 ] = &&LABEL_FILTER_OP_EQ_S64, | |
345 | [ FILTER_OP_NE_S64 ] = &&LABEL_FILTER_OP_NE_S64, | |
346 | [ FILTER_OP_GT_S64 ] = &&LABEL_FILTER_OP_GT_S64, | |
347 | [ FILTER_OP_LT_S64 ] = &&LABEL_FILTER_OP_LT_S64, | |
348 | [ FILTER_OP_GE_S64 ] = &&LABEL_FILTER_OP_GE_S64, | |
349 | [ FILTER_OP_LE_S64 ] = &&LABEL_FILTER_OP_LE_S64, | |
350 | ||
351 | /* double binary comparator */ | |
352 | [ FILTER_OP_EQ_DOUBLE ] = &&LABEL_FILTER_OP_EQ_DOUBLE, | |
353 | [ FILTER_OP_NE_DOUBLE ] = &&LABEL_FILTER_OP_NE_DOUBLE, | |
354 | [ FILTER_OP_GT_DOUBLE ] = &&LABEL_FILTER_OP_GT_DOUBLE, | |
355 | [ FILTER_OP_LT_DOUBLE ] = &&LABEL_FILTER_OP_LT_DOUBLE, | |
356 | [ FILTER_OP_GE_DOUBLE ] = &&LABEL_FILTER_OP_GE_DOUBLE, | |
357 | [ FILTER_OP_LE_DOUBLE ] = &&LABEL_FILTER_OP_LE_DOUBLE, | |
358 | ||
359 | /* Mixed S64-double binary comparators */ | |
360 | [ FILTER_OP_EQ_DOUBLE_S64 ] = &&LABEL_FILTER_OP_EQ_DOUBLE_S64, | |
361 | [ FILTER_OP_NE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_NE_DOUBLE_S64, | |
362 | [ FILTER_OP_GT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GT_DOUBLE_S64, | |
363 | [ FILTER_OP_LT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LT_DOUBLE_S64, | |
364 | [ FILTER_OP_GE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GE_DOUBLE_S64, | |
365 | [ FILTER_OP_LE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LE_DOUBLE_S64, | |
366 | ||
367 | [ FILTER_OP_EQ_S64_DOUBLE ] = &&LABEL_FILTER_OP_EQ_S64_DOUBLE, | |
368 | [ FILTER_OP_NE_S64_DOUBLE ] = &&LABEL_FILTER_OP_NE_S64_DOUBLE, | |
369 | [ FILTER_OP_GT_S64_DOUBLE ] = &&LABEL_FILTER_OP_GT_S64_DOUBLE, | |
370 | [ FILTER_OP_LT_S64_DOUBLE ] = &&LABEL_FILTER_OP_LT_S64_DOUBLE, | |
371 | [ FILTER_OP_GE_S64_DOUBLE ] = &&LABEL_FILTER_OP_GE_S64_DOUBLE, | |
372 | [ FILTER_OP_LE_S64_DOUBLE ] = &&LABEL_FILTER_OP_LE_S64_DOUBLE, | |
373 | ||
374 | /* unary */ | |
375 | [ FILTER_OP_UNARY_PLUS ] = &&LABEL_FILTER_OP_UNARY_PLUS, | |
376 | [ FILTER_OP_UNARY_MINUS ] = &&LABEL_FILTER_OP_UNARY_MINUS, | |
377 | [ FILTER_OP_UNARY_NOT ] = &&LABEL_FILTER_OP_UNARY_NOT, | |
378 | [ FILTER_OP_UNARY_PLUS_S64 ] = &&LABEL_FILTER_OP_UNARY_PLUS_S64, | |
379 | [ FILTER_OP_UNARY_MINUS_S64 ] = &&LABEL_FILTER_OP_UNARY_MINUS_S64, | |
380 | [ FILTER_OP_UNARY_NOT_S64 ] = &&LABEL_FILTER_OP_UNARY_NOT_S64, | |
381 | [ FILTER_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_PLUS_DOUBLE, | |
382 | [ FILTER_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_MINUS_DOUBLE, | |
383 | [ FILTER_OP_UNARY_NOT_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_NOT_DOUBLE, | |
384 | ||
385 | /* logical */ | |
386 | [ FILTER_OP_AND ] = &&LABEL_FILTER_OP_AND, | |
387 | [ FILTER_OP_OR ] = &&LABEL_FILTER_OP_OR, | |
388 | ||
389 | /* load field ref */ | |
390 | [ FILTER_OP_LOAD_FIELD_REF ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF, | |
391 | [ FILTER_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_STRING, | |
392 | [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_SEQUENCE, | |
393 | [ FILTER_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_S64, | |
394 | [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_DOUBLE, | |
395 | ||
396 | /* load from immediate operand */ | |
397 | [ FILTER_OP_LOAD_STRING ] = &&LABEL_FILTER_OP_LOAD_STRING, | |
02aca193 | 398 | [ FILTER_OP_LOAD_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_LOAD_STAR_GLOB_STRING, |
07dfc1d0 MD |
399 | [ FILTER_OP_LOAD_S64 ] = &&LABEL_FILTER_OP_LOAD_S64, |
400 | [ FILTER_OP_LOAD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_DOUBLE, | |
401 | ||
402 | /* cast */ | |
403 | [ FILTER_OP_CAST_TO_S64 ] = &&LABEL_FILTER_OP_CAST_TO_S64, | |
404 | [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_FILTER_OP_CAST_DOUBLE_TO_S64, | |
405 | [ FILTER_OP_CAST_NOP ] = &&LABEL_FILTER_OP_CAST_NOP, | |
406 | ||
407 | /* get context ref */ | |
408 | [ FILTER_OP_GET_CONTEXT_REF ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF, | |
409 | [ FILTER_OP_GET_CONTEXT_REF_STRING ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_STRING, | |
410 | [ FILTER_OP_GET_CONTEXT_REF_S64 ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_S64, | |
411 | [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_DOUBLE, | |
f127e61e MD |
412 | |
413 | /* load userspace field ref */ | |
414 | [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_STRING, | |
415 | [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE, | |
07dfc1d0 MD |
416 | }; |
417 | #endif /* #ifndef INTERPRETER_USE_SWITCH */ | |
418 | ||
419 | START_OP | |
420 | ||
421 | OP(FILTER_OP_UNKNOWN): | |
422 | OP(FILTER_OP_LOAD_FIELD_REF): | |
423 | OP(FILTER_OP_GET_CONTEXT_REF): | |
424 | #ifdef INTERPRETER_USE_SWITCH | |
425 | default: | |
426 | #endif /* INTERPRETER_USE_SWITCH */ | |
427 | printk(KERN_WARNING "unknown bytecode op %u\n", | |
428 | (unsigned int) *(filter_opcode_t *) pc); | |
429 | ret = -EINVAL; | |
430 | goto end; | |
431 | ||
432 | OP(FILTER_OP_RETURN): | |
433 | /* LTTNG_FILTER_DISCARD or LTTNG_FILTER_RECORD_FLAG */ | |
434 | retval = !!estack_ax_v; | |
435 | ret = 0; | |
436 | goto end; | |
437 | ||
438 | /* binary */ | |
439 | OP(FILTER_OP_MUL): | |
440 | OP(FILTER_OP_DIV): | |
441 | OP(FILTER_OP_MOD): | |
442 | OP(FILTER_OP_PLUS): | |
443 | OP(FILTER_OP_MINUS): | |
444 | OP(FILTER_OP_RSHIFT): | |
445 | OP(FILTER_OP_LSHIFT): | |
446 | OP(FILTER_OP_BIN_AND): | |
447 | OP(FILTER_OP_BIN_OR): | |
448 | OP(FILTER_OP_BIN_XOR): | |
449 | printk(KERN_WARNING "unsupported bytecode op %u\n", | |
450 | (unsigned int) *(filter_opcode_t *) pc); | |
451 | ret = -EINVAL; | |
452 | goto end; | |
453 | ||
454 | OP(FILTER_OP_EQ): | |
455 | OP(FILTER_OP_NE): | |
456 | OP(FILTER_OP_GT): | |
457 | OP(FILTER_OP_LT): | |
458 | OP(FILTER_OP_GE): | |
459 | OP(FILTER_OP_LE): | |
460 | printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n", | |
461 | (unsigned int) *(filter_opcode_t *) pc); | |
462 | ret = -EINVAL; | |
463 | goto end; | |
464 | ||
465 | OP(FILTER_OP_EQ_STRING): | |
466 | { | |
467 | int res; | |
468 | ||
469 | res = (stack_strcmp(stack, top, "==") == 0); | |
470 | estack_pop(stack, top, ax, bx); | |
471 | estack_ax_v = res; | |
472 | next_pc += sizeof(struct binary_op); | |
473 | PO; | |
474 | } | |
475 | OP(FILTER_OP_NE_STRING): | |
476 | { | |
477 | int res; | |
478 | ||
479 | res = (stack_strcmp(stack, top, "!=") != 0); | |
480 | estack_pop(stack, top, ax, bx); | |
481 | estack_ax_v = res; | |
482 | next_pc += sizeof(struct binary_op); | |
483 | PO; | |
484 | } | |
485 | OP(FILTER_OP_GT_STRING): | |
486 | { | |
487 | int res; | |
488 | ||
489 | res = (stack_strcmp(stack, top, ">") > 0); | |
490 | estack_pop(stack, top, ax, bx); | |
491 | estack_ax_v = res; | |
492 | next_pc += sizeof(struct binary_op); | |
493 | PO; | |
494 | } | |
495 | OP(FILTER_OP_LT_STRING): | |
496 | { | |
497 | int res; | |
498 | ||
499 | res = (stack_strcmp(stack, top, "<") < 0); | |
500 | estack_pop(stack, top, ax, bx); | |
501 | estack_ax_v = res; | |
502 | next_pc += sizeof(struct binary_op); | |
503 | PO; | |
504 | } | |
505 | OP(FILTER_OP_GE_STRING): | |
506 | { | |
507 | int res; | |
508 | ||
509 | res = (stack_strcmp(stack, top, ">=") >= 0); | |
510 | estack_pop(stack, top, ax, bx); | |
511 | estack_ax_v = res; | |
512 | next_pc += sizeof(struct binary_op); | |
513 | PO; | |
514 | } | |
515 | OP(FILTER_OP_LE_STRING): | |
516 | { | |
517 | int res; | |
518 | ||
519 | res = (stack_strcmp(stack, top, "<=") <= 0); | |
520 | estack_pop(stack, top, ax, bx); | |
521 | estack_ax_v = res; | |
522 | next_pc += sizeof(struct binary_op); | |
523 | PO; | |
524 | } | |
525 | ||
02aca193 PP |
526 | OP(FILTER_OP_EQ_STAR_GLOB_STRING): |
527 | { | |
528 | int res; | |
529 | ||
530 | res = (stack_star_glob_match(stack, top, "==") == 0); | |
531 | estack_pop(stack, top, ax, bx); | |
532 | estack_ax_v = res; | |
533 | next_pc += sizeof(struct binary_op); | |
534 | PO; | |
535 | } | |
536 | OP(FILTER_OP_NE_STAR_GLOB_STRING): | |
537 | { | |
538 | int res; | |
539 | ||
540 | res = (stack_star_glob_match(stack, top, "!=") != 0); | |
541 | estack_pop(stack, top, ax, bx); | |
542 | estack_ax_v = res; | |
543 | next_pc += sizeof(struct binary_op); | |
544 | PO; | |
545 | } | |
546 | ||
07dfc1d0 MD |
547 | OP(FILTER_OP_EQ_S64): |
548 | { | |
549 | int res; | |
550 | ||
551 | res = (estack_bx_v == estack_ax_v); | |
552 | estack_pop(stack, top, ax, bx); | |
553 | estack_ax_v = res; | |
554 | next_pc += sizeof(struct binary_op); | |
555 | PO; | |
556 | } | |
557 | OP(FILTER_OP_NE_S64): | |
558 | { | |
559 | int res; | |
560 | ||
561 | res = (estack_bx_v != estack_ax_v); | |
562 | estack_pop(stack, top, ax, bx); | |
563 | estack_ax_v = res; | |
564 | next_pc += sizeof(struct binary_op); | |
565 | PO; | |
566 | } | |
567 | OP(FILTER_OP_GT_S64): | |
568 | { | |
569 | int res; | |
570 | ||
571 | res = (estack_bx_v > estack_ax_v); | |
572 | estack_pop(stack, top, ax, bx); | |
573 | estack_ax_v = res; | |
574 | next_pc += sizeof(struct binary_op); | |
575 | PO; | |
576 | } | |
577 | OP(FILTER_OP_LT_S64): | |
578 | { | |
579 | int res; | |
580 | ||
581 | res = (estack_bx_v < estack_ax_v); | |
582 | estack_pop(stack, top, ax, bx); | |
583 | estack_ax_v = res; | |
584 | next_pc += sizeof(struct binary_op); | |
585 | PO; | |
586 | } | |
587 | OP(FILTER_OP_GE_S64): | |
588 | { | |
589 | int res; | |
590 | ||
591 | res = (estack_bx_v >= estack_ax_v); | |
592 | estack_pop(stack, top, ax, bx); | |
593 | estack_ax_v = res; | |
594 | next_pc += sizeof(struct binary_op); | |
595 | PO; | |
596 | } | |
597 | OP(FILTER_OP_LE_S64): | |
598 | { | |
599 | int res; | |
600 | ||
601 | res = (estack_bx_v <= estack_ax_v); | |
602 | estack_pop(stack, top, ax, bx); | |
603 | estack_ax_v = res; | |
604 | next_pc += sizeof(struct binary_op); | |
605 | PO; | |
606 | } | |
607 | ||
608 | OP(FILTER_OP_EQ_DOUBLE): | |
609 | OP(FILTER_OP_NE_DOUBLE): | |
610 | OP(FILTER_OP_GT_DOUBLE): | |
611 | OP(FILTER_OP_LT_DOUBLE): | |
612 | OP(FILTER_OP_GE_DOUBLE): | |
613 | OP(FILTER_OP_LE_DOUBLE): | |
614 | { | |
615 | BUG_ON(1); | |
616 | PO; | |
617 | } | |
618 | ||
619 | /* Mixed S64-double binary comparators */ | |
620 | OP(FILTER_OP_EQ_DOUBLE_S64): | |
621 | OP(FILTER_OP_NE_DOUBLE_S64): | |
622 | OP(FILTER_OP_GT_DOUBLE_S64): | |
623 | OP(FILTER_OP_LT_DOUBLE_S64): | |
624 | OP(FILTER_OP_GE_DOUBLE_S64): | |
625 | OP(FILTER_OP_LE_DOUBLE_S64): | |
626 | OP(FILTER_OP_EQ_S64_DOUBLE): | |
627 | OP(FILTER_OP_NE_S64_DOUBLE): | |
628 | OP(FILTER_OP_GT_S64_DOUBLE): | |
629 | OP(FILTER_OP_LT_S64_DOUBLE): | |
630 | OP(FILTER_OP_GE_S64_DOUBLE): | |
631 | OP(FILTER_OP_LE_S64_DOUBLE): | |
632 | { | |
633 | BUG_ON(1); | |
634 | PO; | |
635 | } | |
636 | ||
637 | /* unary */ | |
638 | OP(FILTER_OP_UNARY_PLUS): | |
639 | OP(FILTER_OP_UNARY_MINUS): | |
640 | OP(FILTER_OP_UNARY_NOT): | |
641 | printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n", | |
642 | (unsigned int) *(filter_opcode_t *) pc); | |
643 | ret = -EINVAL; | |
644 | goto end; | |
645 | ||
646 | ||
647 | OP(FILTER_OP_UNARY_PLUS_S64): | |
648 | { | |
649 | next_pc += sizeof(struct unary_op); | |
650 | PO; | |
651 | } | |
652 | OP(FILTER_OP_UNARY_MINUS_S64): | |
653 | { | |
654 | estack_ax_v = -estack_ax_v; | |
655 | next_pc += sizeof(struct unary_op); | |
656 | PO; | |
657 | } | |
658 | OP(FILTER_OP_UNARY_PLUS_DOUBLE): | |
659 | OP(FILTER_OP_UNARY_MINUS_DOUBLE): | |
660 | { | |
661 | BUG_ON(1); | |
662 | PO; | |
663 | } | |
664 | OP(FILTER_OP_UNARY_NOT_S64): | |
665 | { | |
666 | estack_ax_v = !estack_ax_v; | |
667 | next_pc += sizeof(struct unary_op); | |
668 | PO; | |
669 | } | |
670 | OP(FILTER_OP_UNARY_NOT_DOUBLE): | |
671 | { | |
672 | BUG_ON(1); | |
673 | PO; | |
674 | } | |
675 | ||
676 | /* logical */ | |
677 | OP(FILTER_OP_AND): | |
678 | { | |
679 | struct logical_op *insn = (struct logical_op *) pc; | |
680 | ||
681 | /* If AX is 0, skip and evaluate to 0 */ | |
682 | if (unlikely(estack_ax_v == 0)) { | |
683 | dbg_printk("Jumping to bytecode offset %u\n", | |
684 | (unsigned int) insn->skip_offset); | |
685 | next_pc = start_pc + insn->skip_offset; | |
686 | } else { | |
687 | /* Pop 1 when jump not taken */ | |
688 | estack_pop(stack, top, ax, bx); | |
689 | next_pc += sizeof(struct logical_op); | |
690 | } | |
691 | PO; | |
692 | } | |
693 | OP(FILTER_OP_OR): | |
694 | { | |
695 | struct logical_op *insn = (struct logical_op *) pc; | |
696 | ||
697 | /* If AX is nonzero, skip and evaluate to 1 */ | |
698 | ||
699 | if (unlikely(estack_ax_v != 0)) { | |
700 | estack_ax_v = 1; | |
701 | dbg_printk("Jumping to bytecode offset %u\n", | |
702 | (unsigned int) insn->skip_offset); | |
703 | next_pc = start_pc + insn->skip_offset; | |
704 | } else { | |
705 | /* Pop 1 when jump not taken */ | |
706 | estack_pop(stack, top, ax, bx); | |
707 | next_pc += sizeof(struct logical_op); | |
708 | } | |
709 | PO; | |
710 | } | |
711 | ||
712 | ||
713 | /* load field ref */ | |
714 | OP(FILTER_OP_LOAD_FIELD_REF_STRING): | |
715 | { | |
716 | struct load_op *insn = (struct load_op *) pc; | |
717 | struct field_ref *ref = (struct field_ref *) insn->data; | |
718 | ||
719 | dbg_printk("load field ref offset %u type string\n", | |
720 | ref->offset); | |
721 | estack_push(stack, top, ax, bx); | |
722 | estack_ax(stack, top)->u.s.str = | |
723 | *(const char * const *) &filter_stack_data[ref->offset]; | |
724 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
725 | dbg_printk("Filter warning: loading a NULL string.\n"); | |
726 | ret = -EINVAL; | |
727 | goto end; | |
728 | } | |
2339237c | 729 | estack_ax(stack, top)->u.s.seq_len = SIZE_MAX; |
02aca193 PP |
730 | estack_ax(stack, top)->u.s.literal_type = |
731 | ESTACK_STRING_LITERAL_TYPE_NONE; | |
f127e61e | 732 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
733 | dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str); |
734 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
735 | PO; | |
736 | } | |
737 | ||
738 | OP(FILTER_OP_LOAD_FIELD_REF_SEQUENCE): | |
739 | { | |
740 | struct load_op *insn = (struct load_op *) pc; | |
741 | struct field_ref *ref = (struct field_ref *) insn->data; | |
742 | ||
743 | dbg_printk("load field ref offset %u type sequence\n", | |
744 | ref->offset); | |
745 | estack_push(stack, top, ax, bx); | |
746 | estack_ax(stack, top)->u.s.seq_len = | |
747 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
748 | estack_ax(stack, top)->u.s.str = | |
749 | *(const char **) (&filter_stack_data[ref->offset | |
750 | + sizeof(unsigned long)]); | |
751 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
752 | dbg_printk("Filter warning: loading a NULL sequence.\n"); | |
753 | ret = -EINVAL; | |
754 | goto end; | |
755 | } | |
02aca193 PP |
756 | estack_ax(stack, top)->u.s.literal_type = |
757 | ESTACK_STRING_LITERAL_TYPE_NONE; | |
f127e61e | 758 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
759 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); |
760 | PO; | |
761 | } | |
762 | ||
763 | OP(FILTER_OP_LOAD_FIELD_REF_S64): | |
764 | { | |
765 | struct load_op *insn = (struct load_op *) pc; | |
766 | struct field_ref *ref = (struct field_ref *) insn->data; | |
767 | ||
768 | dbg_printk("load field ref offset %u type s64\n", | |
769 | ref->offset); | |
770 | estack_push(stack, top, ax, bx); | |
771 | estack_ax_v = | |
772 | ((struct literal_numeric *) &filter_stack_data[ref->offset])->v; | |
773 | dbg_printk("ref load s64 %lld\n", | |
774 | (long long) estack_ax_v); | |
775 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
776 | PO; | |
777 | } | |
778 | ||
779 | OP(FILTER_OP_LOAD_FIELD_REF_DOUBLE): | |
780 | { | |
781 | BUG_ON(1); | |
782 | PO; | |
783 | } | |
784 | ||
785 | /* load from immediate operand */ | |
786 | OP(FILTER_OP_LOAD_STRING): | |
787 | { | |
788 | struct load_op *insn = (struct load_op *) pc; | |
789 | ||
790 | dbg_printk("load string %s\n", insn->data); | |
791 | estack_push(stack, top, ax, bx); | |
792 | estack_ax(stack, top)->u.s.str = insn->data; | |
2339237c | 793 | estack_ax(stack, top)->u.s.seq_len = SIZE_MAX; |
02aca193 PP |
794 | estack_ax(stack, top)->u.s.literal_type = |
795 | ESTACK_STRING_LITERAL_TYPE_PLAIN; | |
796 | estack_ax(stack, top)->u.s.user = 0; | |
797 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; | |
798 | PO; | |
799 | } | |
800 | ||
801 | OP(FILTER_OP_LOAD_STAR_GLOB_STRING): | |
802 | { | |
803 | struct load_op *insn = (struct load_op *) pc; | |
804 | ||
805 | dbg_printk("load globbing pattern %s\n", insn->data); | |
806 | estack_push(stack, top, ax, bx); | |
807 | estack_ax(stack, top)->u.s.str = insn->data; | |
2339237c | 808 | estack_ax(stack, top)->u.s.seq_len = SIZE_MAX; |
02aca193 PP |
809 | estack_ax(stack, top)->u.s.literal_type = |
810 | ESTACK_STRING_LITERAL_TYPE_STAR_GLOB; | |
f127e61e | 811 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
812 | next_pc += sizeof(struct load_op) + strlen(insn->data) + 1; |
813 | PO; | |
814 | } | |
815 | ||
816 | OP(FILTER_OP_LOAD_S64): | |
817 | { | |
818 | struct load_op *insn = (struct load_op *) pc; | |
819 | ||
820 | estack_push(stack, top, ax, bx); | |
821 | estack_ax_v = ((struct literal_numeric *) insn->data)->v; | |
822 | dbg_printk("load s64 %lld\n", | |
823 | (long long) estack_ax_v); | |
824 | next_pc += sizeof(struct load_op) | |
825 | + sizeof(struct literal_numeric); | |
826 | PO; | |
827 | } | |
828 | ||
829 | OP(FILTER_OP_LOAD_DOUBLE): | |
830 | { | |
831 | BUG_ON(1); | |
832 | PO; | |
833 | } | |
834 | ||
835 | /* cast */ | |
836 | OP(FILTER_OP_CAST_TO_S64): | |
837 | printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n", | |
838 | (unsigned int) *(filter_opcode_t *) pc); | |
839 | ret = -EINVAL; | |
840 | goto end; | |
841 | ||
842 | OP(FILTER_OP_CAST_DOUBLE_TO_S64): | |
843 | { | |
844 | BUG_ON(1); | |
845 | PO; | |
846 | } | |
847 | ||
848 | OP(FILTER_OP_CAST_NOP): | |
849 | { | |
850 | next_pc += sizeof(struct cast_op); | |
851 | PO; | |
852 | } | |
853 | ||
854 | /* get context ref */ | |
855 | OP(FILTER_OP_GET_CONTEXT_REF_STRING): | |
856 | { | |
857 | struct load_op *insn = (struct load_op *) pc; | |
858 | struct field_ref *ref = (struct field_ref *) insn->data; | |
859 | struct lttng_ctx_field *ctx_field; | |
860 | union lttng_ctx_value v; | |
861 | ||
862 | dbg_printk("get context ref offset %u type string\n", | |
863 | ref->offset); | |
864 | ctx_field = <tng_static_ctx->fields[ref->offset]; | |
79150a49 | 865 | ctx_field->get_value(ctx_field, lttng_probe_ctx, &v); |
07dfc1d0 MD |
866 | estack_push(stack, top, ax, bx); |
867 | estack_ax(stack, top)->u.s.str = v.str; | |
868 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
869 | dbg_printk("Filter warning: loading a NULL string.\n"); | |
870 | ret = -EINVAL; | |
871 | goto end; | |
872 | } | |
2339237c | 873 | estack_ax(stack, top)->u.s.seq_len = SIZE_MAX; |
02aca193 PP |
874 | estack_ax(stack, top)->u.s.literal_type = |
875 | ESTACK_STRING_LITERAL_TYPE_NONE; | |
f127e61e | 876 | estack_ax(stack, top)->u.s.user = 0; |
07dfc1d0 MD |
877 | dbg_printk("ref get context string %s\n", estack_ax(stack, top)->u.s.str); |
878 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
879 | PO; | |
880 | } | |
881 | ||
882 | OP(FILTER_OP_GET_CONTEXT_REF_S64): | |
883 | { | |
884 | struct load_op *insn = (struct load_op *) pc; | |
885 | struct field_ref *ref = (struct field_ref *) insn->data; | |
886 | struct lttng_ctx_field *ctx_field; | |
887 | union lttng_ctx_value v; | |
888 | ||
889 | dbg_printk("get context ref offset %u type s64\n", | |
890 | ref->offset); | |
891 | ctx_field = <tng_static_ctx->fields[ref->offset]; | |
79150a49 | 892 | ctx_field->get_value(ctx_field, lttng_probe_ctx, &v); |
07dfc1d0 MD |
893 | estack_push(stack, top, ax, bx); |
894 | estack_ax_v = v.s64; | |
895 | dbg_printk("ref get context s64 %lld\n", | |
896 | (long long) estack_ax_v); | |
897 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
898 | PO; | |
899 | } | |
900 | ||
901 | OP(FILTER_OP_GET_CONTEXT_REF_DOUBLE): | |
902 | { | |
903 | BUG_ON(1); | |
904 | PO; | |
905 | } | |
906 | ||
f127e61e MD |
907 | /* load userspace field ref */ |
908 | OP(FILTER_OP_LOAD_FIELD_REF_USER_STRING): | |
909 | { | |
910 | struct load_op *insn = (struct load_op *) pc; | |
911 | struct field_ref *ref = (struct field_ref *) insn->data; | |
912 | ||
913 | dbg_printk("load field ref offset %u type user string\n", | |
914 | ref->offset); | |
915 | estack_push(stack, top, ax, bx); | |
5b4ad89f | 916 | estack_ax(stack, top)->u.s.user_str = |
f127e61e MD |
917 | *(const char * const *) &filter_stack_data[ref->offset]; |
918 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
919 | dbg_printk("Filter warning: loading a NULL string.\n"); | |
920 | ret = -EINVAL; | |
921 | goto end; | |
922 | } | |
2339237c | 923 | estack_ax(stack, top)->u.s.seq_len = SIZE_MAX; |
02aca193 PP |
924 | estack_ax(stack, top)->u.s.literal_type = |
925 | ESTACK_STRING_LITERAL_TYPE_NONE; | |
f127e61e MD |
926 | estack_ax(stack, top)->u.s.user = 1; |
927 | dbg_printk("ref load string %s\n", estack_ax(stack, top)->u.s.str); | |
928 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
929 | PO; | |
930 | } | |
931 | ||
932 | OP(FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE): | |
933 | { | |
934 | struct load_op *insn = (struct load_op *) pc; | |
935 | struct field_ref *ref = (struct field_ref *) insn->data; | |
936 | ||
937 | dbg_printk("load field ref offset %u type user sequence\n", | |
938 | ref->offset); | |
939 | estack_push(stack, top, ax, bx); | |
940 | estack_ax(stack, top)->u.s.seq_len = | |
941 | *(unsigned long *) &filter_stack_data[ref->offset]; | |
5b4ad89f | 942 | estack_ax(stack, top)->u.s.user_str = |
f127e61e MD |
943 | *(const char **) (&filter_stack_data[ref->offset |
944 | + sizeof(unsigned long)]); | |
945 | if (unlikely(!estack_ax(stack, top)->u.s.str)) { | |
946 | dbg_printk("Filter warning: loading a NULL sequence.\n"); | |
947 | ret = -EINVAL; | |
948 | goto end; | |
949 | } | |
02aca193 PP |
950 | estack_ax(stack, top)->u.s.literal_type = |
951 | ESTACK_STRING_LITERAL_TYPE_NONE; | |
f127e61e MD |
952 | estack_ax(stack, top)->u.s.user = 1; |
953 | next_pc += sizeof(struct load_op) + sizeof(struct field_ref); | |
954 | PO; | |
955 | } | |
956 | ||
07dfc1d0 MD |
957 | END_OP |
958 | end: | |
959 | /* return 0 (discard) on error */ | |
960 | if (ret) | |
961 | return 0; | |
962 | return retval; | |
963 | } | |
964 | ||
965 | #undef START_OP | |
966 | #undef OP | |
967 | #undef PO | |
968 | #undef END_OP |