Commit | Line | Data |
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0ae3cfc6 SM |
1 | /* |
2 | * Copyright 2020 EfficiOS, Inc. | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "bytecode.h" | |
9 | ||
10 | #include <errno.h> | |
11 | ||
12 | #include "common/align.h" | |
13 | ||
14 | #define INIT_ALLOC_SIZE 4 | |
15 | ||
43a35373 JG |
16 | static inline |
17 | int get_count_order(unsigned int count) | |
0ae3cfc6 SM |
18 | { |
19 | int order; | |
20 | ||
21 | order = lttng_fls(count) - 1; | |
22 | if (count & (count - 1)) | |
23 | order++; | |
24 | return order; | |
25 | } | |
26 | ||
27 | LTTNG_HIDDEN | |
2b00d462 | 28 | int bytecode_init(struct lttng_bytecode_alloc **fb) |
0ae3cfc6 SM |
29 | { |
30 | uint32_t alloc_len; | |
31 | ||
2b00d462 | 32 | alloc_len = sizeof(struct lttng_bytecode_alloc) + INIT_ALLOC_SIZE; |
0ae3cfc6 SM |
33 | *fb = calloc(alloc_len, 1); |
34 | if (!*fb) { | |
35 | return -ENOMEM; | |
36 | } else { | |
37 | (*fb)->alloc_len = alloc_len; | |
38 | return 0; | |
39 | } | |
40 | } | |
41 | ||
d0cede25 | 42 | static |
2b00d462 | 43 | int32_t bytecode_reserve(struct lttng_bytecode_alloc **fb, uint32_t align, uint32_t len) |
0ae3cfc6 SM |
44 | { |
45 | int32_t ret; | |
46 | uint32_t padding = offset_align((*fb)->b.len, align); | |
47 | uint32_t new_len = (*fb)->b.len + padding + len; | |
2b00d462 | 48 | uint32_t new_alloc_len = sizeof(struct lttng_bytecode_alloc) + new_len; |
0ae3cfc6 SM |
49 | uint32_t old_alloc_len = (*fb)->alloc_len; |
50 | ||
51 | if (new_len > LTTNG_FILTER_MAX_LEN) | |
52 | return -EINVAL; | |
53 | ||
54 | if (new_alloc_len > old_alloc_len) { | |
2b00d462 | 55 | struct lttng_bytecode_alloc *newptr; |
0ae3cfc6 SM |
56 | |
57 | new_alloc_len = | |
58 | max_t(uint32_t, 1U << get_count_order(new_alloc_len), old_alloc_len << 1); | |
59 | newptr = realloc(*fb, new_alloc_len); | |
60 | if (!newptr) | |
61 | return -ENOMEM; | |
62 | *fb = newptr; | |
63 | /* We zero directly the memory from start of allocation. */ | |
64 | memset(&((char *) *fb)[old_alloc_len], 0, new_alloc_len - old_alloc_len); | |
65 | (*fb)->alloc_len = new_alloc_len; | |
66 | } | |
67 | (*fb)->b.len += padding; | |
68 | ret = (*fb)->b.len; | |
69 | (*fb)->b.len += len; | |
70 | return ret; | |
71 | } | |
72 | ||
73 | LTTNG_HIDDEN | |
2b00d462 | 74 | int bytecode_push(struct lttng_bytecode_alloc **fb, const void *data, |
0ae3cfc6 SM |
75 | uint32_t align, uint32_t len) |
76 | { | |
77 | int32_t offset; | |
78 | ||
79 | offset = bytecode_reserve(fb, align, len); | |
80 | if (offset < 0) | |
81 | return offset; | |
82 | memcpy(&(*fb)->b.data[offset], data, len); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | LTTNG_HIDDEN | |
2b00d462 | 87 | int bytecode_push_logical(struct lttng_bytecode_alloc **fb, |
0ae3cfc6 SM |
88 | struct logical_op *data, |
89 | uint32_t align, uint32_t len, | |
90 | uint16_t *skip_offset) | |
91 | { | |
92 | int32_t offset; | |
93 | ||
94 | offset = bytecode_reserve(fb, align, len); | |
95 | if (offset < 0) | |
96 | return offset; | |
97 | memcpy(&(*fb)->b.data[offset], data, len); | |
98 | *skip_offset = | |
99 | (void *) &((struct logical_op *) &(*fb)->b.data[offset])->skip_offset | |
100 | - (void *) &(*fb)->b.data[0]; | |
101 | return 0; | |
102 | } | |
763f0d4c | 103 | |
6afbab01 SM |
104 | LTTNG_HIDDEN |
105 | int bytecode_push_get_payload_root(struct lttng_bytecode_alloc **bytecode) | |
106 | { | |
107 | int ret; | |
108 | struct load_op *insn; | |
109 | const uint32_t insn_len = sizeof(struct load_op); | |
110 | ||
111 | insn = calloc(insn_len, 1); | |
112 | if (!insn) { | |
113 | ret = -ENOMEM; | |
114 | goto end; | |
115 | } | |
116 | ||
117 | insn->op = BYTECODE_OP_GET_PAYLOAD_ROOT; | |
118 | ret = bytecode_push(bytecode, insn, 1, insn_len); | |
119 | free(insn); | |
120 | end: | |
121 | return ret; | |
122 | } | |
123 | ||
124 | LTTNG_HIDDEN | |
125 | int bytecode_push_get_context_root(struct lttng_bytecode_alloc **bytecode) | |
126 | { | |
127 | int ret; | |
128 | struct load_op *insn; | |
129 | const uint32_t insn_len = sizeof(struct load_op); | |
130 | ||
131 | insn = calloc(insn_len, 1); | |
132 | if (!insn) { | |
133 | ret = -ENOMEM; | |
134 | goto end; | |
135 | } | |
136 | ||
137 | insn->op = BYTECODE_OP_GET_CONTEXT_ROOT; | |
138 | ret = bytecode_push(bytecode, insn, 1, insn_len); | |
139 | free(insn); | |
140 | end: | |
141 | return ret; | |
142 | } | |
143 | ||
144 | LTTNG_HIDDEN | |
145 | int bytecode_push_get_app_context_root(struct lttng_bytecode_alloc **bytecode) | |
146 | { | |
147 | int ret; | |
148 | struct load_op *insn; | |
149 | const uint32_t insn_len = sizeof(struct load_op); | |
150 | ||
151 | insn = calloc(insn_len, 1); | |
152 | if (!insn) { | |
153 | ret = -ENOMEM; | |
154 | goto end; | |
155 | } | |
156 | ||
157 | insn->op = BYTECODE_OP_GET_APP_CONTEXT_ROOT; | |
158 | ret = bytecode_push(bytecode, insn, 1, insn_len); | |
159 | free(insn); | |
160 | end: | |
161 | return ret; | |
162 | } | |
163 | ||
164 | LTTNG_HIDDEN | |
165 | int bytecode_push_get_index_u64(struct lttng_bytecode_alloc **bytecode, | |
166 | uint64_t index) | |
167 | { | |
168 | int ret; | |
169 | struct load_op *insn; | |
170 | struct get_index_u64 index_op_data; | |
171 | const uint32_t insn_len = | |
172 | sizeof(struct load_op) + sizeof(struct get_index_u64); | |
173 | ||
174 | insn = calloc(insn_len, 1); | |
175 | if (!insn) { | |
176 | ret = -ENOMEM; | |
177 | goto end; | |
178 | } | |
179 | ||
180 | insn->op = BYTECODE_OP_GET_INDEX_U64; | |
181 | index_op_data.index = index; | |
182 | memcpy(insn->data, &index_op_data, sizeof(index)); | |
183 | ret = bytecode_push(bytecode, insn, 1, insn_len); | |
184 | ||
185 | free(insn); | |
186 | end: | |
187 | return ret; | |
188 | } | |
189 | ||
190 | LTTNG_HIDDEN | |
191 | int bytecode_push_get_symbol(struct lttng_bytecode_alloc **bytecode, | |
192 | struct lttng_bytecode_alloc **bytecode_reloc, | |
193 | const char *symbol) | |
194 | { | |
195 | int ret; | |
196 | struct load_op *insn; | |
197 | struct get_symbol symbol_offset; | |
198 | uint32_t reloc_offset_u32; | |
199 | uint16_t reloc_offset; | |
200 | uint32_t bytecode_reloc_offset_u32; | |
201 | const uint32_t insn_len = | |
202 | sizeof(struct load_op) + sizeof(struct get_symbol); | |
203 | ||
204 | insn = calloc(insn_len, 1); | |
205 | if (!insn) { | |
206 | ret = -ENOMEM; | |
207 | goto end; | |
208 | } | |
209 | ||
210 | insn->op = BYTECODE_OP_GET_SYMBOL; | |
211 | ||
212 | /* | |
213 | * Get offset in the reloc portion at which the symbol name | |
214 | * will end up at (GET_SYMBOL's operand points there). | |
215 | */ | |
216 | bytecode_reloc_offset_u32 = bytecode_get_len(&(*bytecode_reloc)->b) + | |
217 | sizeof(reloc_offset); | |
218 | symbol_offset.offset = (uint16_t) bytecode_reloc_offset_u32; | |
219 | memcpy(insn->data, &symbol_offset, sizeof(symbol_offset)); | |
220 | ||
221 | /* | |
222 | * Get offset in the bytecode where the opcode will end up at, | |
223 | * the reloc offset points to it. | |
224 | */ | |
225 | reloc_offset_u32 = bytecode_get_len(&(*bytecode)->b); | |
226 | if (reloc_offset_u32 > LTTNG_FILTER_MAX_LEN - 1) { | |
227 | ret = -EINVAL; | |
228 | goto end; | |
229 | } | |
230 | reloc_offset = (uint16_t) reloc_offset_u32; | |
231 | ||
232 | /* Append op in bytecode. */ | |
233 | ret = bytecode_push(bytecode, insn, 1, insn_len); | |
234 | if (ret) { | |
235 | goto end; | |
236 | } | |
237 | ||
238 | /* Append reloc offset. */ | |
239 | ret = bytecode_push(bytecode_reloc, &reloc_offset, | |
240 | 1, sizeof(reloc_offset)); | |
241 | if (ret) { | |
242 | goto end; | |
243 | } | |
244 | ||
245 | /* Append symbol name. */ | |
246 | ret = bytecode_push(bytecode_reloc, symbol, 1, strlen(symbol) + 1); | |
247 | ||
248 | end: | |
249 | free(insn); | |
250 | return ret; | |
251 | } | |
252 | ||
763f0d4c SM |
253 | /* |
254 | * Allocate an lttng_bytecode object and copy the given original bytecode. | |
255 | * | |
256 | * Return allocated bytecode or NULL on error. | |
257 | */ | |
258 | LTTNG_HIDDEN | |
2b00d462 SM |
259 | struct lttng_bytecode *lttng_bytecode_copy( |
260 | const struct lttng_bytecode *orig_f) | |
763f0d4c | 261 | { |
2b00d462 | 262 | struct lttng_bytecode *bytecode = NULL; |
763f0d4c SM |
263 | |
264 | bytecode = zmalloc(sizeof(*bytecode) + orig_f->len); | |
265 | if (!bytecode) { | |
266 | goto error; | |
267 | } | |
268 | ||
269 | memcpy(bytecode, orig_f, sizeof(*bytecode) + orig_f->len); | |
270 | ||
271 | error: | |
272 | return bytecode; | |
273 | } |