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 | { |
437d5aa5 | 178 | const struct lttng_kernel_event_field **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; |
2dfda770 | 188 | fields = event_desc->fields; |
07dfc1d0 MD |
189 | if (!fields) |
190 | return -EINVAL; | |
2dfda770 | 191 | nr_fields = event_desc->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; | |
05f403d7 | 251 | |
437d5aa5 | 252 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || array_type->encoding == lttng_kernel_string_encoding_none) |
05f403d7 MD |
253 | return -EINVAL; |
254 | if (field->user) | |
255 | op->op = BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE; | |
256 | else | |
257 | op->op = BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE; | |
258 | break; | |
259 | } | |
437d5aa5 | 260 | case lttng_kernel_type_sequence: |
05f403d7 | 261 | { |
437d5aa5 MD |
262 | const struct lttng_kernel_type_sequence *sequence_type = lttng_kernel_get_type_sequence(field->type); |
263 | const struct lttng_kernel_type_common *elem_type = sequence_type->elem_type; | |
05f403d7 | 264 | |
437d5aa5 | 265 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || sequence_type->encoding == lttng_kernel_string_encoding_none) |
05f403d7 | 266 | return -EINVAL; |
3834b99f | 267 | if (field->user) |
80c2a69a | 268 | op->op = BYTECODE_OP_LOAD_FIELD_REF_USER_SEQUENCE; |
3834b99f | 269 | else |
80c2a69a | 270 | op->op = BYTECODE_OP_LOAD_FIELD_REF_SEQUENCE; |
3834b99f | 271 | break; |
05f403d7 | 272 | } |
12bb2edb | 273 | case lttng_kernel_type_string: |
3834b99f | 274 | if (field->user) |
80c2a69a | 275 | op->op = BYTECODE_OP_LOAD_FIELD_REF_USER_STRING; |
3834b99f | 276 | else |
80c2a69a | 277 | op->op = BYTECODE_OP_LOAD_FIELD_REF_STRING; |
3834b99f | 278 | break; |
437d5aa5 MD |
279 | case lttng_kernel_type_struct: /* Unsupported. */ |
280 | case lttng_kernel_type_variant: /* Unsupported. */ | |
3834b99f MD |
281 | default: |
282 | return -EINVAL; | |
283 | } | |
284 | /* set offset */ | |
285 | field_ref->offset = (uint16_t) field_offset; | |
07dfc1d0 | 286 | break; |
3834b99f | 287 | } |
07dfc1d0 MD |
288 | default: |
289 | return -EINVAL; | |
290 | } | |
07dfc1d0 MD |
291 | return 0; |
292 | } | |
293 | ||
294 | static | |
2dfda770 | 295 | int apply_context_reloc(struct bytecode_runtime *runtime, |
07dfc1d0 MD |
296 | uint32_t runtime_len, |
297 | uint32_t reloc_offset, | |
3834b99f | 298 | const char *context_name, |
80c2a69a | 299 | enum bytecode_op bytecode_op) |
07dfc1d0 | 300 | { |
07dfc1d0 | 301 | struct load_op *op; |
437d5aa5 | 302 | struct lttng_kernel_ctx_field *ctx_field; |
07dfc1d0 MD |
303 | int idx; |
304 | ||
305 | dbg_printk("Apply context reloc: %u %s\n", reloc_offset, context_name); | |
306 | ||
307 | /* Get context index */ | |
437d5aa5 | 308 | idx = lttng_kernel_get_context_index(lttng_static_ctx, context_name); |
07dfc1d0 MD |
309 | if (idx < 0) |
310 | return -ENOENT; | |
311 | ||
312 | /* Check if idx is too large for 16-bit offset */ | |
606828e4 | 313 | if (idx > LTTNG_KERNEL_ABI_FILTER_BYTECODE_MAX_LEN - 1) |
07dfc1d0 MD |
314 | return -EINVAL; |
315 | ||
316 | /* Get context return type */ | |
317 | ctx_field = <tng_static_ctx->fields[idx]; | |
3834b99f MD |
318 | op = (struct load_op *) &runtime->code[reloc_offset]; |
319 | ||
80c2a69a FD |
320 | switch (bytecode_op) { |
321 | case BYTECODE_OP_GET_CONTEXT_REF: | |
3834b99f MD |
322 | { |
323 | struct field_ref *field_ref; | |
324 | ||
325 | field_ref = (struct field_ref *) op->data; | |
437d5aa5 | 326 | switch (ctx_field->event_field->type->type) { |
12bb2edb | 327 | case lttng_kernel_type_integer: |
437d5aa5 | 328 | case lttng_kernel_type_enum: |
80c2a69a | 329 | op->op = BYTECODE_OP_GET_CONTEXT_REF_S64; |
3834b99f MD |
330 | break; |
331 | /* Sequence and array supported as string */ | |
12bb2edb | 332 | case lttng_kernel_type_string: |
437d5aa5 | 333 | BUG_ON(ctx_field->event_field->user); |
80c2a69a | 334 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; |
3834b99f | 335 | break; |
437d5aa5 | 336 | case lttng_kernel_type_array: |
05f403d7 | 337 | { |
437d5aa5 MD |
338 | const struct lttng_kernel_type_array *array_type = lttng_kernel_get_type_array(ctx_field->event_field->type); |
339 | const struct lttng_kernel_type_common *elem_type = array_type->elem_type; | |
05f403d7 | 340 | |
437d5aa5 | 341 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || array_type->encoding == lttng_kernel_string_encoding_none) |
ceabb767 | 342 | return -EINVAL; |
437d5aa5 | 343 | BUG_ON(ctx_field->event_field->user); |
80c2a69a | 344 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; |
ceabb767 | 345 | break; |
05f403d7 | 346 | } |
437d5aa5 | 347 | case lttng_kernel_type_sequence: |
05f403d7 | 348 | { |
437d5aa5 MD |
349 | const struct lttng_kernel_type_sequence *sequence_type = lttng_kernel_get_type_sequence(ctx_field->event_field->type); |
350 | const struct lttng_kernel_type_common *elem_type = sequence_type->elem_type; | |
05f403d7 | 351 | |
437d5aa5 | 352 | if (!lttng_kernel_type_is_bytewise_integer(elem_type) || sequence_type->encoding == lttng_kernel_string_encoding_none) |
ceabb767 | 353 | return -EINVAL; |
437d5aa5 | 354 | BUG_ON(ctx_field->event_field->user); |
80c2a69a | 355 | op->op = BYTECODE_OP_GET_CONTEXT_REF_STRING; |
ceabb767 | 356 | break; |
05f403d7 | 357 | } |
437d5aa5 MD |
358 | case lttng_kernel_type_struct: /* Unsupported. */ |
359 | case lttng_kernel_type_variant: /* Unsupported. */ | |
3834b99f MD |
360 | default: |
361 | return -EINVAL; | |
362 | } | |
363 | /* set offset to context index within channel contexts */ | |
364 | field_ref->offset = (uint16_t) idx; | |
07dfc1d0 | 365 | break; |
3834b99f | 366 | } |
07dfc1d0 MD |
367 | default: |
368 | return -EINVAL; | |
369 | } | |
07dfc1d0 MD |
370 | return 0; |
371 | } | |
372 | ||
373 | static | |
437d5aa5 | 374 | int apply_reloc(const struct lttng_kernel_event_desc *event_desc, |
07dfc1d0 MD |
375 | struct bytecode_runtime *runtime, |
376 | uint32_t runtime_len, | |
377 | uint32_t reloc_offset, | |
378 | const char *name) | |
379 | { | |
380 | struct load_op *op; | |
381 | ||
382 | dbg_printk("Apply reloc: %u %s\n", reloc_offset, name); | |
383 | ||
384 | /* Ensure that the reloc is within the code */ | |
385 | if (runtime_len - reloc_offset < sizeof(uint16_t)) | |
386 | return -EINVAL; | |
387 | ||
3834b99f | 388 | op = (struct load_op *) &runtime->code[reloc_offset]; |
07dfc1d0 | 389 | switch (op->op) { |
80c2a69a | 390 | case BYTECODE_OP_LOAD_FIELD_REF: |
2dfda770 | 391 | return apply_field_reloc(event_desc, runtime, runtime_len, |
3834b99f | 392 | reloc_offset, name, op->op); |
80c2a69a | 393 | case BYTECODE_OP_GET_CONTEXT_REF: |
2dfda770 | 394 | return apply_context_reloc(runtime, runtime_len, |
3834b99f | 395 | reloc_offset, name, op->op); |
80c2a69a FD |
396 | case BYTECODE_OP_GET_SYMBOL: |
397 | case BYTECODE_OP_GET_SYMBOL_FIELD: | |
3834b99f MD |
398 | /* |
399 | * Will be handled by load specialize phase or | |
400 | * dynamically by interpreter. | |
401 | */ | |
402 | return 0; | |
07dfc1d0 | 403 | default: |
5a15f70c | 404 | printk(KERN_WARNING "LTTng: filter: Unknown reloc op type %u\n", op->op); |
07dfc1d0 MD |
405 | return -EINVAL; |
406 | } | |
407 | return 0; | |
408 | } | |
409 | ||
410 | static | |
9906b046 | 411 | int bytecode_is_linked(struct lttng_kernel_bytecode_node *bytecode, |
2dfda770 | 412 | struct list_head *bytecode_runtime_head) |
07dfc1d0 | 413 | { |
dc7350d6 | 414 | struct lttng_kernel_bytecode_runtime *bc_runtime; |
07dfc1d0 | 415 | |
2dfda770 | 416 | list_for_each_entry(bc_runtime, bytecode_runtime_head, node) { |
89ec2b91 | 417 | if (bc_runtime->bc == bytecode) |
07dfc1d0 MD |
418 | return 1; |
419 | } | |
420 | return 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Take a bytecode with reloc table and link it to an event to create a | |
425 | * bytecode runtime. | |
426 | */ | |
427 | static | |
437d5aa5 MD |
428 | int link_bytecode(const struct lttng_kernel_event_desc *event_desc, |
429 | struct lttng_kernel_ctx *ctx, | |
9906b046 | 430 | struct lttng_kernel_bytecode_node *bytecode, |
a345f621 | 431 | struct list_head *bytecode_runtime_head, |
07dfc1d0 MD |
432 | struct list_head *insert_loc) |
433 | { | |
434 | int ret, offset, next_offset; | |
435 | struct bytecode_runtime *runtime = NULL; | |
436 | size_t runtime_alloc_len; | |
437 | ||
89ec2b91 | 438 | if (!bytecode) |
07dfc1d0 MD |
439 | return 0; |
440 | /* Bytecode already linked */ | |
a345f621 | 441 | if (bytecode_is_linked(bytecode, bytecode_runtime_head)) |
07dfc1d0 MD |
442 | return 0; |
443 | ||
444 | dbg_printk("Linking...\n"); | |
445 | ||
446 | /* We don't need the reloc table in the runtime */ | |
89ec2b91 | 447 | runtime_alloc_len = sizeof(*runtime) + bytecode->bc.reloc_offset; |
07dfc1d0 MD |
448 | runtime = kzalloc(runtime_alloc_len, GFP_KERNEL); |
449 | if (!runtime) { | |
450 | ret = -ENOMEM; | |
451 | goto alloc_error; | |
452 | } | |
8a445457 | 453 | runtime->p.type = bytecode->type; |
89ec2b91 | 454 | runtime->p.bc = bytecode; |
2dfda770 | 455 | runtime->p.ctx = ctx; |
89ec2b91 | 456 | runtime->len = bytecode->bc.reloc_offset; |
07dfc1d0 | 457 | /* copy original bytecode */ |
89ec2b91 | 458 | memcpy(runtime->code, bytecode->bc.data, runtime->len); |
07dfc1d0 MD |
459 | /* |
460 | * apply relocs. Those are a uint16_t (offset in bytecode) | |
461 | * followed by a string (field name). | |
462 | */ | |
89ec2b91 FD |
463 | for (offset = bytecode->bc.reloc_offset; |
464 | offset < bytecode->bc.len; | |
07dfc1d0 MD |
465 | offset = next_offset) { |
466 | uint16_t reloc_offset = | |
89ec2b91 | 467 | *(uint16_t *) &bytecode->bc.data[offset]; |
07dfc1d0 | 468 | const char *name = |
89ec2b91 | 469 | (const char *) &bytecode->bc.data[offset + sizeof(uint16_t)]; |
07dfc1d0 | 470 | |
2dfda770 | 471 | ret = apply_reloc(event_desc, runtime, runtime->len, reloc_offset, name); |
07dfc1d0 MD |
472 | if (ret) { |
473 | goto link_error; | |
474 | } | |
475 | next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; | |
476 | } | |
477 | /* Validate bytecode */ | |
80c2a69a | 478 | ret = lttng_bytecode_validate(runtime); |
07dfc1d0 MD |
479 | if (ret) { |
480 | goto link_error; | |
481 | } | |
482 | /* Specialize bytecode */ | |
80c2a69a | 483 | ret = lttng_bytecode_specialize(event_desc, runtime); |
07dfc1d0 MD |
484 | if (ret) { |
485 | goto link_error; | |
486 | } | |
8a445457 | 487 | runtime->p.interpreter_func = lttng_bytecode_interpret; |
07dfc1d0 MD |
488 | runtime->p.link_failed = 0; |
489 | list_add_rcu(&runtime->p.node, insert_loc); | |
490 | dbg_printk("Linking successful.\n"); | |
491 | return 0; | |
492 | ||
493 | link_error: | |
3d650c7b | 494 | |
8a445457 | 495 | runtime->p.interpreter_func = lttng_bytecode_interpret_error; |
07dfc1d0 MD |
496 | runtime->p.link_failed = 1; |
497 | list_add_rcu(&runtime->p.node, insert_loc); | |
498 | alloc_error: | |
499 | dbg_printk("Linking failed.\n"); | |
500 | return ret; | |
501 | } | |
502 | ||
dc7350d6 | 503 | void lttng_bytecode_sync_state(struct lttng_kernel_bytecode_runtime *runtime) |
99d223ad | 504 | { |
9906b046 | 505 | struct lttng_kernel_bytecode_node *bc = runtime->bc; |
99d223ad FD |
506 | |
507 | if (!bc->enabler->enabled || runtime->link_failed) | |
8a445457 | 508 | runtime->interpreter_func = lttng_bytecode_interpret_error; |
99d223ad | 509 | else |
8a445457 | 510 | runtime->interpreter_func = lttng_bytecode_interpret; |
99d223ad FD |
511 | } |
512 | ||
07dfc1d0 | 513 | /* |
99d223ad FD |
514 | * Given the lists of bytecode programs of an instance (event or event |
515 | * notifier) and of a matching enabler, try to link all the enabler's bytecode | |
516 | * programs with the instance. | |
60206944 FD |
517 | * |
518 | * This function is called after we confirmed that name enabler and the | |
519 | * instance are matching names (or glob pattern matching). | |
07dfc1d0 | 520 | */ |
437d5aa5 MD |
521 | void lttng_enabler_link_bytecode(const struct lttng_kernel_event_desc *event_desc, |
522 | struct lttng_kernel_ctx *ctx, | |
60206944 FD |
523 | struct list_head *instance_bytecode_head, |
524 | struct list_head *enabler_bytecode_head) | |
07dfc1d0 | 525 | { |
9906b046 | 526 | struct lttng_kernel_bytecode_node *enabler_bc; |
dc7350d6 | 527 | struct lttng_kernel_bytecode_runtime *runtime; |
07dfc1d0 | 528 | |
2dfda770 | 529 | WARN_ON_ONCE(!event_desc); |
07dfc1d0 | 530 | |
60206944 FD |
531 | /* Go over all the bytecode programs of the enabler. */ |
532 | list_for_each_entry(enabler_bc, enabler_bytecode_head, node) { | |
07dfc1d0 MD |
533 | int found = 0, ret; |
534 | struct list_head *insert_loc; | |
535 | ||
60206944 FD |
536 | /* |
537 | * Check if the current enabler bytecode program is already | |
538 | * linked with the instance. | |
539 | */ | |
540 | list_for_each_entry(runtime, instance_bytecode_head, node) { | |
541 | if (runtime->bc == enabler_bc) { | |
07dfc1d0 MD |
542 | found = 1; |
543 | break; | |
544 | } | |
545 | } | |
60206944 FD |
546 | |
547 | /* | |
548 | * Skip bytecode already linked, go to the next enabler | |
549 | * bytecode program. | |
550 | */ | |
07dfc1d0 MD |
551 | if (found) |
552 | continue; | |
553 | ||
554 | /* | |
555 | * Insert at specified priority (seqnum) in increasing | |
df9d0220 FD |
556 | * order. If there already is a bytecode of the same priority, |
557 | * insert the new bytecode right after it. | |
07dfc1d0 MD |
558 | */ |
559 | list_for_each_entry_reverse(runtime, | |
60206944 FD |
560 | instance_bytecode_head, node) { |
561 | if (runtime->bc->bc.seqnum <= enabler_bc->bc.seqnum) { | |
07dfc1d0 MD |
562 | /* insert here */ |
563 | insert_loc = &runtime->node; | |
564 | goto add_within; | |
565 | } | |
566 | } | |
567 | /* Add to head to list */ | |
60206944 | 568 | insert_loc = instance_bytecode_head; |
07dfc1d0 MD |
569 | add_within: |
570 | dbg_printk("linking bytecode\n"); | |
a345f621 | 571 | ret = link_bytecode(event_desc, ctx, enabler_bc, instance_bytecode_head, insert_loc); |
07dfc1d0 MD |
572 | if (ret) { |
573 | dbg_printk("[lttng filter] warning: cannot link event bytecode\n"); | |
574 | } | |
575 | } | |
576 | } | |
577 | ||
578 | /* | |
579 | * We own the filter_bytecode if we return success. | |
580 | */ | |
581 | int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
9906b046 | 582 | struct lttng_kernel_bytecode_node *filter_bytecode) |
07dfc1d0 MD |
583 | { |
584 | list_add(&filter_bytecode->node, &enabler->filter_bytecode_head); | |
585 | return 0; | |
586 | } | |
587 | ||
588 | void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler) | |
589 | { | |
9906b046 | 590 | struct lttng_kernel_bytecode_node *filter_bytecode, *tmp; |
07dfc1d0 MD |
591 | |
592 | list_for_each_entry_safe(filter_bytecode, tmp, | |
593 | &enabler->filter_bytecode_head, node) { | |
594 | kfree(filter_bytecode); | |
595 | } | |
596 | } | |
597 | ||
0648898e | 598 | void lttng_free_event_filter_runtime(struct lttng_kernel_event_common *event) |
07dfc1d0 MD |
599 | { |
600 | struct bytecode_runtime *runtime, *tmp; | |
601 | ||
602 | list_for_each_entry_safe(runtime, tmp, | |
0648898e | 603 | &event->priv->filter_bytecode_runtime_head, p.node) { |
3ef5cc03 MD |
604 | kfree(runtime->data); |
605 | kfree(runtime); | |
606 | } | |
607 | } |