Commit | Line | Data |
---|---|---|
9f36eaed MJ |
1 | /* SPDX-License-Identifier: MIT |
2 | * | |
80c2a69a | 3 | * lttng-bytecode.c |
07dfc1d0 | 4 | * |
80c2a69a | 5 | * LTTng modules bytecode code. |
07dfc1d0 | 6 | * |
bbf3aef5 | 7 | * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
07dfc1d0 MD |
8 | */ |
9 | ||
10 | #include <linux/list.h> | |
11 | #include <linux/slab.h> | |
12 | ||
80c2a69a | 13 | #include <lttng/lttng-bytecode.h> |
437d5aa5 | 14 | #include <lttng/events-internal.h> |
07dfc1d0 MD |
15 | |
16 | static const char *opnames[] = { | |
80c2a69a | 17 | [ BYTECODE_OP_UNKNOWN ] = "UNKNOWN", |
07dfc1d0 | 18 | |
80c2a69a | 19 | [ BYTECODE_OP_RETURN ] = "RETURN", |
07dfc1d0 MD |
20 | |
21 | /* binary */ | |
80c2a69a FD |
22 | [ BYTECODE_OP_MUL ] = "MUL", |
23 | [ BYTECODE_OP_DIV ] = "DIV", | |
24 | [ BYTECODE_OP_MOD ] = "MOD", | |
25 | [ BYTECODE_OP_PLUS ] = "PLUS", | |
26 | [ BYTECODE_OP_MINUS ] = "MINUS", | |
27 | [ BYTECODE_OP_BIT_RSHIFT ] = "BIT_RSHIFT", | |
28 | [ BYTECODE_OP_BIT_LSHIFT ] = "BIT_LSHIFT", | |
29 | [ BYTECODE_OP_BIT_AND ] = "BIT_AND", | |
30 | [ BYTECODE_OP_BIT_OR ] = "BIT_OR", | |
31 | [ BYTECODE_OP_BIT_XOR ] = "BIT_XOR", | |
07dfc1d0 MD |
32 | |
33 | /* binary comparators */ | |
80c2a69a FD |
34 | [ BYTECODE_OP_EQ ] = "EQ", |
35 | [ BYTECODE_OP_NE ] = "NE", | |
36 | [ BYTECODE_OP_GT ] = "GT", | |
37 | [ BYTECODE_OP_LT ] = "LT", | |
38 | [ BYTECODE_OP_GE ] = "GE", | |
39 | [ BYTECODE_OP_LE ] = "LE", | |
07dfc1d0 MD |
40 | |
41 | /* string binary comparators */ | |
80c2a69a FD |
42 | [ BYTECODE_OP_EQ_STRING ] = "EQ_STRING", |
43 | [ BYTECODE_OP_NE_STRING ] = "NE_STRING", | |
44 | [ BYTECODE_OP_GT_STRING ] = "GT_STRING", | |
45 | [ BYTECODE_OP_LT_STRING ] = "LT_STRING", | |
46 | [ BYTECODE_OP_GE_STRING ] = "GE_STRING", | |
47 | [ BYTECODE_OP_LE_STRING ] = "LE_STRING", | |
07dfc1d0 MD |
48 | |
49 | /* s64 binary comparators */ | |
80c2a69a FD |
50 | [ BYTECODE_OP_EQ_S64 ] = "EQ_S64", |
51 | [ BYTECODE_OP_NE_S64 ] = "NE_S64", | |
52 | [ BYTECODE_OP_GT_S64 ] = "GT_S64", | |
53 | [ BYTECODE_OP_LT_S64 ] = "LT_S64", | |
54 | [ BYTECODE_OP_GE_S64 ] = "GE_S64", | |
55 | [ BYTECODE_OP_LE_S64 ] = "LE_S64", | |
07dfc1d0 MD |
56 | |
57 | /* double binary comparators */ | |
80c2a69a FD |
58 | [ BYTECODE_OP_EQ_DOUBLE ] = "EQ_DOUBLE", |
59 | [ BYTECODE_OP_NE_DOUBLE ] = "NE_DOUBLE", | |
60 | [ BYTECODE_OP_GT_DOUBLE ] = "GT_DOUBLE", | |
61 | [ BYTECODE_OP_LT_DOUBLE ] = "LT_DOUBLE", | |
62 | [ BYTECODE_OP_GE_DOUBLE ] = "GE_DOUBLE", | |
63 | [ BYTECODE_OP_LE_DOUBLE ] = "LE_DOUBLE", | |
07dfc1d0 MD |
64 | |
65 | /* Mixed S64-double binary comparators */ | |
80c2a69a FD |
66 | [ BYTECODE_OP_EQ_DOUBLE_S64 ] = "EQ_DOUBLE_S64", |
67 | [ BYTECODE_OP_NE_DOUBLE_S64 ] = "NE_DOUBLE_S64", | |
68 | [ BYTECODE_OP_GT_DOUBLE_S64 ] = "GT_DOUBLE_S64", | |
69 | [ BYTECODE_OP_LT_DOUBLE_S64 ] = "LT_DOUBLE_S64", | |
70 | [ BYTECODE_OP_GE_DOUBLE_S64 ] = "GE_DOUBLE_S64", | |
71 | [ BYTECODE_OP_LE_DOUBLE_S64 ] = "LE_DOUBLE_S64", | |
72 | ||
73 | [ BYTECODE_OP_EQ_S64_DOUBLE ] = "EQ_S64_DOUBLE", | |
74 | [ BYTECODE_OP_NE_S64_DOUBLE ] = "NE_S64_DOUBLE", | |
75 | [ BYTECODE_OP_GT_S64_DOUBLE ] = "GT_S64_DOUBLE", | |
76 | [ BYTECODE_OP_LT_S64_DOUBLE ] = "LT_S64_DOUBLE", | |
77 | [ BYTECODE_OP_GE_S64_DOUBLE ] = "GE_S64_DOUBLE", | |
78 | [ BYTECODE_OP_LE_S64_DOUBLE ] = "LE_S64_DOUBLE", | |
07dfc1d0 MD |
79 | |
80 | /* unary */ | |
80c2a69a FD |
81 | [ BYTECODE_OP_UNARY_PLUS ] = "UNARY_PLUS", |
82 | [ BYTECODE_OP_UNARY_MINUS ] = "UNARY_MINUS", | |
83 | [ BYTECODE_OP_UNARY_NOT ] = "UNARY_NOT", | |
84 | [ BYTECODE_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64", | |
85 | [ BYTECODE_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64", | |
86 | [ BYTECODE_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64", | |
87 | [ BYTECODE_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE", | |
88 | [ BYTECODE_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE", | |
89 | [ BYTECODE_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE", | |
07dfc1d0 MD |
90 | |
91 | /* logical */ | |
80c2a69a FD |
92 | [ BYTECODE_OP_AND ] = "AND", |
93 | [ BYTECODE_OP_OR ] = "OR", | |
07dfc1d0 MD |
94 | |
95 | /* load field ref */ | |
80c2a69a FD |
96 | [ BYTECODE_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF", |
97 | [ BYTECODE_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING", | |
98 | [ BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE", | |
99 | [ BYTECODE_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64", | |
100 | [ BYTECODE_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE", | |
07dfc1d0 MD |
101 | |
102 | /* load from immediate operand */ | |
80c2a69a FD |
103 | [ BYTECODE_OP_LOAD_STRING ] = "LOAD_STRING", |
104 | [ BYTECODE_OP_LOAD_S64 ] = "LOAD_S64", | |
105 | [ BYTECODE_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", | |
07dfc1d0 MD |
106 | |
107 | /* cast */ | |
80c2a69a FD |
108 | [ BYTECODE_OP_CAST_TO_S64 ] = "CAST_TO_S64", |
109 | [ BYTECODE_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64", | |
110 | [ BYTECODE_OP_CAST_NOP ] = "CAST_NOP", | |
07dfc1d0 MD |
111 | |
112 | /* get context ref */ | |
80c2a69a FD |
113 | [ BYTECODE_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF", |
114 | [ BYTECODE_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING", | |
115 | [ BYTECODE_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64", | |
116 | [ BYTECODE_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE", | |
f127e61e MD |
117 | |
118 | /* load userspace field ref */ | |
80c2a69a FD |
119 | [ BYTECODE_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING", |
120 | [ BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE", | |
83fb57ab MD |
121 | |
122 | /* | |
123 | * load immediate star globbing pattern (literal string) | |
124 | * from immediate. | |
125 | */ | |
80c2a69a | 126 | [ BYTECODE_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING", |
83fb57ab MD |
127 | |
128 | /* globbing pattern binary operator: apply to */ | |
80c2a69a FD |
129 | [ BYTECODE_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING", |
130 | [ BYTECODE_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING", | |
3834b99f MD |
131 | |
132 | /* | |
133 | * Instructions for recursive traversal through composed types. | |
134 | */ | |
80c2a69a FD |
135 | [ BYTECODE_OP_GET_CONTEXT_ROOT ] = "GET_CONTEXT_ROOT", |
136 | [ BYTECODE_OP_GET_APP_CONTEXT_ROOT ] = "GET_APP_CONTEXT_ROOT", | |
137 | [ BYTECODE_OP_GET_PAYLOAD_ROOT ] = "GET_PAYLOAD_ROOT", | |
138 | ||
139 | [ BYTECODE_OP_GET_SYMBOL ] = "GET_SYMBOL", | |
140 | [ BYTECODE_OP_GET_SYMBOL_FIELD ] = "GET_SYMBOL_FIELD", | |
141 | [ BYTECODE_OP_GET_INDEX_U16 ] = "GET_INDEX_U16", | |
142 | [ BYTECODE_OP_GET_INDEX_U64 ] = "GET_INDEX_U64", | |
143 | ||
144 | [ BYTECODE_OP_LOAD_FIELD ] = "LOAD_FIELD", | |
145 | [ BYTECODE_OP_LOAD_FIELD_S8 ] = "LOAD_FIELD_S8", | |
146 | [ BYTECODE_OP_LOAD_FIELD_S16 ] = "LOAD_FIELD_S16", | |
147 | [ BYTECODE_OP_LOAD_FIELD_S32 ] = "LOAD_FIELD_S32", | |
148 | [ BYTECODE_OP_LOAD_FIELD_S64 ] = "LOAD_FIELD_S64", | |
149 | [ BYTECODE_OP_LOAD_FIELD_U8 ] = "LOAD_FIELD_U8", | |
150 | [ BYTECODE_OP_LOAD_FIELD_U16 ] = "LOAD_FIELD_U16", | |
151 | [ BYTECODE_OP_LOAD_FIELD_U32 ] = "LOAD_FIELD_U32", | |
152 | [ BYTECODE_OP_LOAD_FIELD_U64 ] = "LOAD_FIELD_U64", | |
153 | [ BYTECODE_OP_LOAD_FIELD_STRING ] = "LOAD_FIELD_STRING", | |
154 | [ BYTECODE_OP_LOAD_FIELD_SEQUENCE ] = "LOAD_FIELD_SEQUENCE", | |
155 | [ BYTECODE_OP_LOAD_FIELD_DOUBLE ] = "LOAD_FIELD_DOUBLE", | |
156 | ||
157 | [ BYTECODE_OP_UNARY_BIT_NOT ] = "UNARY_BIT_NOT", | |
158 | ||
159 | [ BYTECODE_OP_RETURN_S64 ] = "RETURN_S64", | |
07dfc1d0 MD |
160 | }; |
161 | ||
80c2a69a | 162 | const char *lttng_bytecode_print_op(enum bytecode_op op) |
07dfc1d0 | 163 | { |
80c2a69a | 164 | if (op >= NR_BYTECODE_OPS) |
07dfc1d0 MD |
165 | return "UNKNOWN"; |
166 | else | |
167 | return opnames[op]; | |
168 | } | |
169 | ||
170 | static | |
437d5aa5 | 171 | int apply_field_reloc(const struct lttng_kernel_event_desc *event_desc, |
07dfc1d0 MD |
172 | struct bytecode_runtime *runtime, |
173 | uint32_t runtime_len, | |
174 | uint32_t reloc_offset, | |
3834b99f | 175 | const char *field_name, |
80c2a69a | 176 | enum bytecode_op bytecode_op) |
07dfc1d0 | 177 | { |
4f1d1ee5 | 178 | const struct lttng_kernel_event_field * const *fields, *field = NULL; |
07dfc1d0 | 179 | unsigned int nr_fields, i; |
07dfc1d0 MD |
180 | struct load_op *op; |
181 | uint32_t field_offset = 0; | |
182 | ||
183 | dbg_printk("Apply field reloc: %u %s\n", reloc_offset, field_name); | |
184 | ||
185 | /* Lookup event by name */ | |
2dfda770 | 186 | if (!event_desc) |
07dfc1d0 | 187 | return -EINVAL; |
6c8c025b | 188 | fields = event_desc->tp_class->fields; |
07dfc1d0 MD |
189 | if (!fields) |
190 | return -EINVAL; | |
6c8c025b | 191 | nr_fields = event_desc->tp_class->nr_fields; |
07dfc1d0 | 192 | for (i = 0; i < nr_fields; i++) { |
437d5aa5 | 193 | if (fields[i]->nofilter) |
ceabb767 | 194 | continue; |
437d5aa5 MD |
195 | if (!strcmp(fields[i]->name, field_name)) { |
196 | field = fields[i]; | |
07dfc1d0 MD |
197 | break; |
198 | } | |
199 | /* compute field offset */ | |
437d5aa5 | 200 | switch (fields[i]->type->type) { |
12bb2edb | 201 | case lttng_kernel_type_integer: |
437d5aa5 | 202 | case lttng_kernel_type_enum: |
07dfc1d0 MD |
203 | field_offset += sizeof(int64_t); |
204 | break; | |
437d5aa5 MD |
205 | case lttng_kernel_type_array: |
206 | if (!lttng_kernel_type_is_bytewise_integer(lttng_kernel_get_type_array(fields[i]->type)->elem_type)) | |
ceabb767 MD |
207 | return -EINVAL; |
208 | field_offset += sizeof(unsigned long); | |
209 | field_offset += sizeof(void *); | |
210 | break; | |
437d5aa5 MD |
211 | case lttng_kernel_type_sequence: |
212 | if (!lttng_kernel_type_is_bytewise_integer(lttng_kernel_get_type_sequence(fields[i]->type)->elem_type)) | |
ceabb767 | 213 | return -EINVAL; |
07dfc1d0 MD |
214 | field_offset += sizeof(unsigned long); |
215 | field_offset += sizeof(void *); | |
216 | break; | |
12bb2edb | 217 | case lttng_kernel_type_string: |
07dfc1d0 MD |
218 | field_offset += sizeof(void *); |
219 | break; | |
437d5aa5 MD |
220 | case lttng_kernel_type_struct: /* Unsupported. */ |
221 | case lttng_kernel_type_variant: /* Unsupported. */ | |
07dfc1d0 MD |
222 | default: |
223 | return -EINVAL; | |
224 | } | |
225 | } | |
226 | if (!field) | |
227 | return -EINVAL; | |
228 | ||
229 | /* Check if field offset is too large for 16-bit offset */ | |
606828e4 | 230 | if (field_offset > LTTNG_KERNEL_ABI_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
231 | return -EINVAL; |
232 | ||
233 | /* set type */ | |
3834b99f MD |
234 | op = (struct load_op *) &runtime->code[reloc_offset]; |
235 | ||
80c2a69a FD |
236 | switch (bytecode_op) { |
237 | case BYTECODE_OP_LOAD_FIELD_REF: | |
3834b99f MD |
238 | { |
239 | struct field_ref *field_ref; | |
240 | ||
241 | field_ref = (struct field_ref *) op->data; | |
437d5aa5 | 242 | switch (field->type->type) { |
12bb2edb | 243 | case lttng_kernel_type_integer: |
437d5aa5 | 244 | case lttng_kernel_type_enum: |
80c2a69a | 245 | op->op = BYTECODE_OP_LOAD_FIELD_REF_S64; |
3834b99f | 246 | break; |
437d5aa5 | 247 | case lttng_kernel_type_array: |
05f403d7 | 248 | { |
437d5aa5 MD |
249 | const struct lttng_kernel_type_array *array_type = lttng_kernel_get_type_array(field->type); |
250 | const struct lttng_kernel_type_common *elem_type = array_type->elem_type; | |
4697aac7 | 251 | const struct lttng_kernel_type_integer *elem_integer_type; |
05f403d7 | 252 | |
437d5aa5 | 253 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || array_type->encoding == lttng_kernel_string_encoding_none) |
05f403d7 | 254 | return -EINVAL; |
4697aac7 MD |
255 | elem_integer_type = container_of(elem_type, const struct lttng_kernel_type_integer, parent); |
256 | if (elem_integer_type->user) | |
05f403d7 MD |
257 | op->op = BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE; |
258 | else | |
259 | op->op = BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE; | |
260 | break; | |
261 | } | |
437d5aa5 | 262 | case lttng_kernel_type_sequence: |
05f403d7 | 263 | { |
437d5aa5 MD |
264 | const struct lttng_kernel_type_sequence *sequence_type = lttng_kernel_get_type_sequence(field->type); |
265 | const struct lttng_kernel_type_common *elem_type = sequence_type->elem_type; | |
4697aac7 | 266 | const struct lttng_kernel_type_integer *elem_integer_type; |
05f403d7 | 267 | |
437d5aa5 | 268 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || sequence_type->encoding == lttng_kernel_string_encoding_none) |
05f403d7 | 269 | return -EINVAL; |
4697aac7 MD |
270 | elem_integer_type = container_of(elem_type, const struct lttng_kernel_type_integer, parent); |
271 | if (elem_integer_type->user) | |
80c2a69a | 272 | op->op = BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE; |
3834b99f | 273 | else |
80c2a69a | 274 | op->op = BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE; |
3834b99f | 275 | break; |
05f403d7 | 276 | } |
12bb2edb | 277 | case lttng_kernel_type_string: |
4697aac7 MD |
278 | { |
279 | const struct lttng_kernel_type_string *string_type = lttng_kernel_get_type_string(field->type); | |
280 | ||
281 | if (string_type->user) | |
80c2a69a | 282 | op->op = BYTECODE_OP_LOAD_FIELD_REF_USER_STRING; |
3834b99f | 283 | else |
80c2a69a | 284 | op->op = BYTECODE_OP_LOAD_FIELD_REF_STRING; |
3834b99f | 285 | break; |
4697aac7 | 286 | } |
437d5aa5 MD |
287 | case lttng_kernel_type_struct: /* Unsupported. */ |
288 | case lttng_kernel_type_variant: /* Unsupported. */ | |
3834b99f MD |
289 | default: |
290 | return -EINVAL; | |
291 | } | |
292 | /* set offset */ | |
293 | field_ref->offset = (uint16_t) field_offset; | |
07dfc1d0 | 294 | break; |
3834b99f | 295 | } |
07dfc1d0 MD |
296 | default: |
297 | return -EINVAL; | |
298 | } | |
07dfc1d0 MD |
299 | return 0; |
300 | } | |
301 | ||
302 | static | |
2dfda770 | 303 | int apply_context_reloc(struct bytecode_runtime *runtime, |
07dfc1d0 MD |
304 | uint32_t runtime_len, |
305 | uint32_t reloc_offset, | |
3834b99f | 306 | const char *context_name, |
80c2a69a | 307 | enum bytecode_op bytecode_op) |
07dfc1d0 | 308 | { |
07dfc1d0 | 309 | struct load_op *op; |
437d5aa5 | 310 | struct lttng_kernel_ctx_field *ctx_field; |
07dfc1d0 MD |
311 | int idx; |
312 | ||
313 | dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name); | |
314 | ||
315 | /* Get context index */ | |
437d5aa5 | 316 | idx = lttng_kernel_get_context_index(lttng_static_ctx, context_name); |
07dfc1d0 MD |
317 | if (idx < 0) |
318 | return -ENOENT; | |
319 | ||
320 | /* Check if idx is too large for 16-bit offset */ | |
606828e4 | 321 | if (idx > LTTNG_KERNEL_ABI_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
322 | return -EINVAL; |
323 | ||
324 | /* Get context return type */ | |
325 | ctx_field = <tng_static_ctx->fields[idx]; | |
3834b99f MD |
326 | op = (struct load_op *) &runtime->code[reloc_offset]; |
327 | ||
80c2a69a FD |
328 | switch (bytecode_op) { |
329 | case BYTECODE_OP_GET_CONTEXT_REF: | |
3834b99f MD |
330 | { |
331 | struct field_ref *field_ref; | |
332 | ||
333 | field_ref = (struct field_ref *) op->data; | |
437d5aa5 | 334 | switch (ctx_field->event_field->type->type) { |
12bb2edb | 335 | case lttng_kernel_type_integer: |
437d5aa5 | 336 | case lttng_kernel_type_enum: |
80c2a69a | 337 | op->op = BYTECODE_OP_GET_CONTEXT_REF_S64; |
3834b99f MD |
338 | break; |
339 | /* Sequence and array supported as string */ | |
12bb2edb | 340 | case lttng_kernel_type_string: |
4697aac7 MD |
341 | { |
342 | const struct lttng_kernel_type_string *string_type = lttng_kernel_get_type_string(ctx_field->event_field->type); | |
343 | ||
344 | BUG_ON(string_type->user); | |
80c2a69a | 345 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; |
3834b99f | 346 | break; |
4697aac7 | 347 | } |
437d5aa5 | 348 | case lttng_kernel_type_array: |
05f403d7 | 349 | { |
437d5aa5 MD |
350 | const struct lttng_kernel_type_array *array_type = lttng_kernel_get_type_array(ctx_field->event_field->type); |
351 | const struct lttng_kernel_type_common *elem_type = array_type->elem_type; | |
4697aac7 | 352 | const struct lttng_kernel_type_integer *elem_integer_type; |
05f403d7 | 353 | |
437d5aa5 | 354 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || array_type->encoding == lttng_kernel_string_encoding_none) |
ceabb767 | 355 | return -EINVAL; |
4697aac7 MD |
356 | elem_integer_type = container_of(elem_type, const struct lttng_kernel_type_integer, parent); |
357 | BUG_ON(elem_integer_type->user); | |
80c2a69a | 358 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; |
ceabb767 | 359 | break; |
05f403d7 | 360 | } |
437d5aa5 | 361 | case lttng_kernel_type_sequence: |
05f403d7 | 362 | { |
437d5aa5 MD |
363 | const struct lttng_kernel_type_sequence *sequence_type = lttng_kernel_get_type_sequence(ctx_field->event_field->type); |
364 | const struct lttng_kernel_type_common *elem_type = sequence_type->elem_type; | |
4697aac7 | 365 | const struct lttng_kernel_type_integer *elem_integer_type; |
05f403d7 | 366 | |
437d5aa5 | 367 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || sequence_type->encoding == lttng_kernel_string_encoding_none) |
ceabb767 | 368 | return -EINVAL; |
4697aac7 MD |
369 | elem_integer_type = container_of(elem_type, const struct lttng_kernel_type_integer, parent); |
370 | BUG_ON(elem_integer_type->user); | |
80c2a69a | 371 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; |
ceabb767 | 372 | break; |
05f403d7 | 373 | } |
437d5aa5 MD |
374 | case lttng_kernel_type_struct: /* Unsupported. */ |
375 | case lttng_kernel_type_variant: /* Unsupported. */ | |
3834b99f MD |
376 | default: |
377 | return -EINVAL; | |
378 | } | |
379 | /* set offset to context index within channel contexts */ | |
380 | field_ref->offset = (uint16_t) idx; | |
07dfc1d0 | 381 | break; |
3834b99f | 382 | } |
07dfc1d0 MD |
383 | default: |
384 | return -EINVAL; | |
385 | } | |
07dfc1d0 MD |
386 | return 0; |
387 | } | |
388 | ||
389 | static | |
437d5aa5 | 390 | int apply_reloc(const struct lttng_kernel_event_desc *event_desc, |
07dfc1d0 MD |
391 | struct bytecode_runtime *runtime, |
392 | uint32_t runtime_len, | |
393 | uint32_t reloc_offset, | |
394 | const char *name) | |
395 | { | |
396 | struct load_op *op; | |
397 | ||
398 | dbg_printk("Apply reloc: %u %s\n", reloc_offset, name); | |
399 | ||
400 | /* Ensure that the reloc is within the code */ | |
401 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
402 | return -EINVAL; | |
403 | ||
3834b99f | 404 | op = (struct load_op *) &runtime->code[reloc_offset]; |
07dfc1d0 | 405 | switch (op->op) { |
80c2a69a | 406 | case BYTECODE_OP_LOAD_FIELD_REF: |
2dfda770 | 407 | return apply_field_reloc(event_desc, runtime, runtime_len, |
3834b99f | 408 | reloc_offset, name, op->op); |
80c2a69a | 409 | case BYTECODE_OP_GET_CONTEXT_REF: |
2dfda770 | 410 | return apply_context_reloc(runtime, runtime_len, |
3834b99f | 411 | reloc_offset, name, op->op); |
80c2a69a FD |
412 | case BYTECODE_OP_GET_SYMBOL: |
413 | case BYTECODE_OP_GET_SYMBOL_FIELD: | |
3834b99f MD |
414 | /* |
415 | * Will be handled by load specialize phase or | |
416 | * dynamically by interpreter. | |
417 | */ | |
418 | return 0; | |
07dfc1d0 | 419 | default: |
5a15f70c | 420 | printk(KERN_WARNING "LTTng: filter: Unknown reloc op type %u\n", op->op); |
07dfc1d0 MD |
421 | return -EINVAL; |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static | |
d64ca521 | 427 | int bytecode_is_linked(struct lttng_kernel_bytecode_node *bytecode, |
2dfda770 | 428 | struct list_head *bytecode_runtime_head) |
07dfc1d0 | 429 | { |
218585b9 | 430 | struct lttng_kernel_bytecode_runtime *bc_runtime; |
07dfc1d0 | 431 | |
2dfda770 | 432 | list_for_each_entry(bc_runtime, bytecode_runtime_head, node) { |
89ec2b91 | 433 | if (bc_runtime->bc == bytecode) |
07dfc1d0 MD |
434 | return 1; |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Take a bytecode with reloc table and link it to an event to create a | |
441 | * bytecode runtime. | |
442 | */ | |
443 | static | |
437d5aa5 MD |
444 | int link_bytecode(const struct lttng_kernel_event_desc *event_desc, |
445 | struct lttng_kernel_ctx *ctx, | |
d64ca521 | 446 | struct lttng_kernel_bytecode_node *bytecode, |
a345f621 | 447 | struct list_head *bytecode_runtime_head, |
07dfc1d0 MD |
448 | struct list_head *insert_loc) |
449 | { | |
450 | int ret, offset, next_offset; | |
451 | struct bytecode_runtime *runtime = NULL; | |
452 | size_t runtime_alloc_len; | |
453 | ||
89ec2b91 | 454 | if (!bytecode) |
07dfc1d0 MD |
455 | return 0; |
456 | /* Bytecode already linked */ | |
a345f621 | 457 | if (bytecode_is_linked(bytecode, bytecode_runtime_head)) |
07dfc1d0 MD |
458 | return 0; |
459 | ||
460 | dbg_printk("Linking...\n"); | |
461 | ||
462 | /* We don't need the reloc table in the runtime */ | |
89ec2b91 | 463 | runtime_alloc_len = sizeof(*runtime) + bytecode->bc.reloc_offset; |
07dfc1d0 MD |
464 | runtime = kzalloc(runtime_alloc_len, GFP_KERNEL); |
465 | if (!runtime) { | |
466 | ret = -ENOMEM; | |
467 | goto alloc_error; | |
468 | } | |
8a445457 | 469 | runtime->p.type = bytecode->type; |
89ec2b91 | 470 | runtime->p.bc = bytecode; |
2dfda770 | 471 | runtime->p.ctx = ctx; |
89ec2b91 | 472 | runtime->len = bytecode->bc.reloc_offset; |
07dfc1d0 | 473 | /* copy original bytecode */ |
89ec2b91 | 474 | memcpy(runtime->code, bytecode->bc.data, runtime->len); |
e2a52595 MD |
475 | /* Validate bytecode load instructions before relocs. */ |
476 | ret = lttng_bytecode_validate_load(runtime); | |
477 | if (ret) { | |
478 | goto link_error; | |
479 | } | |
07dfc1d0 MD |
480 | /* |
481 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
482 | * followed by a string (field name). | |
483 | */ | |
89ec2b91 FD |
484 | for (offset = bytecode->bc.reloc_offset; |
485 | offset < bytecode->bc.len; | |
07dfc1d0 MD |
486 | offset = next_offset) { |
487 | uint16_t reloc_offset = | |
89ec2b91 | 488 | *(uint16_t *) &bytecode->bc.data[offset]; |
07dfc1d0 | 489 | const char *name = |
89ec2b91 | 490 | (const char *) &bytecode->bc.data[offset + sizeof(uint16_t)]; |
07dfc1d0 | 491 | |
2dfda770 | 492 | ret = apply_reloc(event_desc, runtime, runtime->len, reloc_offset, name); |
07dfc1d0 MD |
493 | if (ret) { |
494 | goto link_error; | |
495 | } | |
496 | next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; | |
497 | } | |
498 | /* Validate bytecode */ | |
80c2a69a | 499 | ret = lttng_bytecode_validate(runtime); |
07dfc1d0 MD |
500 | if (ret) { |
501 | goto link_error; | |
502 | } | |
503 | /* Specialize bytecode */ | |
80c2a69a | 504 | ret = lttng_bytecode_specialize(event_desc, runtime); |
07dfc1d0 MD |
505 | if (ret) { |
506 | goto link_error; | |
507 | } | |
8a445457 | 508 | runtime->p.interpreter_func = lttng_bytecode_interpret; |
07dfc1d0 MD |
509 | runtime->p.link_failed = 0; |
510 | list_add_rcu(&runtime->p.node, insert_loc); | |
511 | dbg_printk("Linking successful.\n"); | |
512 | return 0; | |
513 | ||
514 | link_error: | |
3d650c7b | 515 | |
8a445457 | 516 | runtime->p.interpreter_func = lttng_bytecode_interpret_error; |
07dfc1d0 MD |
517 | runtime->p.link_failed = 1; |
518 | list_add_rcu(&runtime->p.node, insert_loc); | |
519 | alloc_error: | |
520 | dbg_printk("Linking failed.\n"); | |
521 | return ret; | |
522 | } | |
523 | ||
218585b9 | 524 | void lttng_bytecode_sync_state(struct lttng_kernel_bytecode_runtime *runtime) |
99d223ad | 525 | { |
d64ca521 | 526 | struct lttng_kernel_bytecode_node *bc = runtime->bc; |
99d223ad FD |
527 | |
528 | if (!bc->enabler->enabled || runtime->link_failed) | |
8a445457 | 529 | runtime->interpreter_func = lttng_bytecode_interpret_error; |
99d223ad | 530 | else |
8a445457 | 531 | runtime->interpreter_func = lttng_bytecode_interpret; |
99d223ad FD |
532 | } |
533 | ||
07dfc1d0 | 534 | /* |
99d223ad FD |
535 | * Given the lists of bytecode programs of an instance (event or event |
536 | * notifier) and of a matching enabler, try to link all the enabler's bytecode | |
537 | * programs with the instance. | |
60206944 FD |
538 | * |
539 | * This function is called after we confirmed that name enabler and the | |
540 | * instance are matching names (or glob pattern matching). | |
07dfc1d0 | 541 | */ |
437d5aa5 MD |
542 | void lttng_enabler_link_bytecode(const struct lttng_kernel_event_desc *event_desc, |
543 | struct lttng_kernel_ctx *ctx, | |
60206944 FD |
544 | struct list_head *instance_bytecode_head, |
545 | struct list_head *enabler_bytecode_head) | |
07dfc1d0 | 546 | { |
d64ca521 | 547 | struct lttng_kernel_bytecode_node *enabler_bc; |
218585b9 | 548 | struct lttng_kernel_bytecode_runtime *runtime; |
07dfc1d0 | 549 | |
2dfda770 | 550 | WARN_ON_ONCE(!event_desc); |
07dfc1d0 | 551 | |
60206944 FD |
552 | /* Go over all the bytecode programs of the enabler. */ |
553 | list_for_each_entry(enabler_bc, enabler_bytecode_head, node) { | |
07dfc1d0 MD |
554 | int found = 0, ret; |
555 | struct list_head *insert_loc; | |
556 | ||
60206944 FD |
557 | /* |
558 | * Check if the current enabler bytecode program is already | |
559 | * linked with the instance. | |
560 | */ | |
561 | list_for_each_entry(runtime, instance_bytecode_head, node) { | |
562 | if (runtime->bc == enabler_bc) { | |
07dfc1d0 MD |
563 | found = 1; |
564 | break; | |
565 | } | |
566 | } | |
60206944 FD |
567 | |
568 | /* | |
569 | * Skip bytecode already linked, go to the next enabler | |
570 | * bytecode program. | |
571 | */ | |
07dfc1d0 MD |
572 | if (found) |
573 | continue; | |
574 | ||
575 | /* | |
576 | * Insert at specified priority (seqnum) in increasing | |
df9d0220 FD |
577 | * order. If there already is a bytecode of the same priority, |
578 | * insert the new bytecode right after it. | |
07dfc1d0 MD |
579 | */ |
580 | list_for_each_entry_reverse(runtime, | |
60206944 FD |
581 | instance_bytecode_head, node) { |
582 | if (runtime->bc->bc.seqnum <= enabler_bc->bc.seqnum) { | |
07dfc1d0 MD |
583 | /* insert here */ |
584 | insert_loc = &runtime->node; | |
585 | goto add_within; | |
586 | } | |
587 | } | |
588 | /* Add to head to list */ | |
60206944 | 589 | insert_loc = instance_bytecode_head; |
07dfc1d0 MD |
590 | add_within: |
591 | dbg_printk("linking bytecode\n"); | |
a345f621 | 592 | ret = link_bytecode(event_desc, ctx, enabler_bc, instance_bytecode_head, insert_loc); |
07dfc1d0 MD |
593 | if (ret) { |
594 | dbg_printk("[lttng filter] warning: cannot link event bytecode\n"); | |
595 | } | |
596 | } | |
597 | } | |
598 | ||
0648898e | 599 | void lttng_free_event_filter_runtime(struct lttng_kernel_event_common *event) |
07dfc1d0 MD |
600 | { |
601 | struct bytecode_runtime *runtime, *tmp; | |
602 | ||
603 | list_for_each_entry_safe(runtime, tmp, | |
0648898e | 604 | &event->priv->filter_bytecode_runtime_head, p.node) { |
3ef5cc03 MD |
605 | kfree(runtime->data); |
606 | kfree(runtime); | |
607 | } | |
608 | } |