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bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8ab83f56 SD |
2 | /* |
3 | * Common code for probe-based Dynamic events. | |
4 | * | |
8ab83f56 SD |
5 | * This code was copied from kernel/trace/trace_kprobe.c written by |
6 | * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | |
7 | * | |
8 | * Updates to make this generic: | |
9 | * Copyright (C) IBM Corporation, 2010-2011 | |
10 | * Author: Srikar Dronamraju | |
11 | */ | |
72576341 | 12 | #define pr_fmt(fmt) "trace_probe: " fmt |
8ab83f56 SD |
13 | |
14 | #include "trace_probe.h" | |
15 | ||
ab105a4f MH |
16 | #undef C |
17 | #define C(a, b) b | |
18 | ||
19 | static const char *trace_probe_err_text[] = { ERRORS }; | |
20 | ||
08416252 | 21 | static const char *reserved_field_names[] = { |
8ab83f56 SD |
22 | "common_type", |
23 | "common_flags", | |
24 | "common_preempt_count", | |
25 | "common_pid", | |
26 | "common_tgid", | |
27 | FIELD_STRING_IP, | |
28 | FIELD_STRING_RETIP, | |
29 | FIELD_STRING_FUNC, | |
30 | }; | |
31 | ||
8ab83f56 | 32 | /* Printing in basic type function template */ |
17ce3dc7 | 33 | #define DEFINE_BASIC_PRINT_TYPE_FUNC(tname, type, fmt) \ |
56de7630 | 34 | int PRINT_TYPE_FUNC_NAME(tname)(struct trace_seq *s, void *data, void *ent)\ |
8ab83f56 | 35 | { \ |
56de7630 | 36 | trace_seq_printf(s, fmt, *(type *)data); \ |
d2b0191a | 37 | return !trace_seq_has_overflowed(s); \ |
8ab83f56 | 38 | } \ |
7bfbc63e | 39 | const char PRINT_TYPE_FMT_NAME(tname)[] = fmt; |
8ab83f56 | 40 | |
bdca79c2 MH |
41 | DEFINE_BASIC_PRINT_TYPE_FUNC(u8, u8, "%u") |
42 | DEFINE_BASIC_PRINT_TYPE_FUNC(u16, u16, "%u") | |
43 | DEFINE_BASIC_PRINT_TYPE_FUNC(u32, u32, "%u") | |
44 | DEFINE_BASIC_PRINT_TYPE_FUNC(u64, u64, "%Lu") | |
17ce3dc7 MH |
45 | DEFINE_BASIC_PRINT_TYPE_FUNC(s8, s8, "%d") |
46 | DEFINE_BASIC_PRINT_TYPE_FUNC(s16, s16, "%d") | |
47 | DEFINE_BASIC_PRINT_TYPE_FUNC(s32, s32, "%d") | |
48 | DEFINE_BASIC_PRINT_TYPE_FUNC(s64, s64, "%Ld") | |
49 | DEFINE_BASIC_PRINT_TYPE_FUNC(x8, u8, "0x%x") | |
50 | DEFINE_BASIC_PRINT_TYPE_FUNC(x16, u16, "0x%x") | |
51 | DEFINE_BASIC_PRINT_TYPE_FUNC(x32, u32, "0x%x") | |
52 | DEFINE_BASIC_PRINT_TYPE_FUNC(x64, u64, "0x%Lx") | |
8ab83f56 | 53 | |
60c2e0ce MH |
54 | int PRINT_TYPE_FUNC_NAME(symbol)(struct trace_seq *s, void *data, void *ent) |
55 | { | |
56 | trace_seq_printf(s, "%pS", (void *)*(unsigned long *)data); | |
57 | return !trace_seq_has_overflowed(s); | |
58 | } | |
59 | const char PRINT_TYPE_FMT_NAME(symbol)[] = "%pS"; | |
60 | ||
8ab83f56 | 61 | /* Print type function for string type */ |
56de7630 | 62 | int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, void *data, void *ent) |
8ab83f56 SD |
63 | { |
64 | int len = *(u32 *)data >> 16; | |
65 | ||
66 | if (!len) | |
56de7630 | 67 | trace_seq_puts(s, "(fault)"); |
8ab83f56 | 68 | else |
56de7630 | 69 | trace_seq_printf(s, "\"%s\"", |
d2b0191a SRRH |
70 | (const char *)get_loc_data(data, ent)); |
71 | return !trace_seq_has_overflowed(s); | |
8ab83f56 SD |
72 | } |
73 | ||
b26c74e1 | 74 | const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\""; |
8ab83f56 | 75 | |
f451bc89 MH |
76 | /* Fetch type information table */ |
77 | static const struct fetch_type probe_fetch_types[] = { | |
78 | /* Special types */ | |
b26a124c | 79 | __ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1, 1, |
f451bc89 | 80 | "__data_loc char[]"), |
b26a124c MHG |
81 | __ASSIGN_FETCH_TYPE("ustring", string, string, sizeof(u32), 1, 1, |
82 | "__data_loc char[]"), | |
83 | __ASSIGN_FETCH_TYPE("symstr", string, string, sizeof(u32), 1, 1, | |
88903c46 | 84 | "__data_loc char[]"), |
f451bc89 MH |
85 | /* Basic types */ |
86 | ASSIGN_FETCH_TYPE(u8, u8, 0), | |
87 | ASSIGN_FETCH_TYPE(u16, u16, 0), | |
88 | ASSIGN_FETCH_TYPE(u32, u32, 0), | |
89 | ASSIGN_FETCH_TYPE(u64, u64, 0), | |
90 | ASSIGN_FETCH_TYPE(s8, u8, 1), | |
91 | ASSIGN_FETCH_TYPE(s16, u16, 1), | |
92 | ASSIGN_FETCH_TYPE(s32, u32, 1), | |
93 | ASSIGN_FETCH_TYPE(s64, u64, 1), | |
94 | ASSIGN_FETCH_TYPE_ALIAS(x8, u8, u8, 0), | |
95 | ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0), | |
96 | ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0), | |
97 | ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0), | |
60c2e0ce | 98 | ASSIGN_FETCH_TYPE_ALIAS(symbol, ADDR_FETCH_TYPE, ADDR_FETCH_TYPE, 0), |
f451bc89 MH |
99 | |
100 | ASSIGN_FETCH_TYPE_END | |
101 | }; | |
102 | ||
d4505aa6 | 103 | static const struct fetch_type *find_fetch_type(const char *type, unsigned long flags) |
8ab83f56 SD |
104 | { |
105 | int i; | |
106 | ||
d4505aa6 MHG |
107 | /* Reject the symbol/symstr for uprobes */ |
108 | if (type && (flags & TPARG_FL_USER) && | |
109 | (!strcmp(type, "symbol") || !strcmp(type, "symstr"))) | |
110 | return NULL; | |
111 | ||
8ab83f56 SD |
112 | if (!type) |
113 | type = DEFAULT_FETCH_TYPE_STR; | |
114 | ||
115 | /* Special case: bitfield */ | |
116 | if (*type == 'b') { | |
117 | unsigned long bs; | |
118 | ||
119 | type = strchr(type, '/'); | |
120 | if (!type) | |
121 | goto fail; | |
122 | ||
123 | type++; | |
bcd83ea6 | 124 | if (kstrtoul(type, 0, &bs)) |
8ab83f56 SD |
125 | goto fail; |
126 | ||
127 | switch (bs) { | |
128 | case 8: | |
d4505aa6 | 129 | return find_fetch_type("u8", flags); |
8ab83f56 | 130 | case 16: |
d4505aa6 | 131 | return find_fetch_type("u16", flags); |
8ab83f56 | 132 | case 32: |
d4505aa6 | 133 | return find_fetch_type("u32", flags); |
8ab83f56 | 134 | case 64: |
d4505aa6 | 135 | return find_fetch_type("u64", flags); |
8ab83f56 SD |
136 | default: |
137 | goto fail; | |
138 | } | |
139 | } | |
140 | ||
f451bc89 MH |
141 | for (i = 0; probe_fetch_types[i].name; i++) { |
142 | if (strcmp(type, probe_fetch_types[i].name) == 0) | |
143 | return &probe_fetch_types[i]; | |
34fee3a1 | 144 | } |
8ab83f56 SD |
145 | |
146 | fail: | |
147 | return NULL; | |
148 | } | |
149 | ||
ab105a4f MH |
150 | static struct trace_probe_log trace_probe_log; |
151 | ||
152 | void trace_probe_log_init(const char *subsystem, int argc, const char **argv) | |
153 | { | |
154 | trace_probe_log.subsystem = subsystem; | |
155 | trace_probe_log.argc = argc; | |
156 | trace_probe_log.argv = argv; | |
157 | trace_probe_log.index = 0; | |
158 | } | |
159 | ||
160 | void trace_probe_log_clear(void) | |
161 | { | |
162 | memset(&trace_probe_log, 0, sizeof(trace_probe_log)); | |
163 | } | |
164 | ||
165 | void trace_probe_log_set_index(int index) | |
166 | { | |
167 | trace_probe_log.index = index; | |
168 | } | |
169 | ||
170 | void __trace_probe_log_err(int offset, int err_type) | |
171 | { | |
172 | char *command, *p; | |
173 | int i, len = 0, pos = 0; | |
174 | ||
175 | if (!trace_probe_log.argv) | |
176 | return; | |
177 | ||
f2cc020d | 178 | /* Recalculate the length and allocate buffer */ |
ab105a4f MH |
179 | for (i = 0; i < trace_probe_log.argc; i++) { |
180 | if (i == trace_probe_log.index) | |
181 | pos = len; | |
182 | len += strlen(trace_probe_log.argv[i]) + 1; | |
183 | } | |
184 | command = kzalloc(len, GFP_KERNEL); | |
185 | if (!command) | |
186 | return; | |
187 | ||
d2aea95a MH |
188 | if (trace_probe_log.index >= trace_probe_log.argc) { |
189 | /** | |
190 | * Set the error position is next to the last arg + space. | |
191 | * Note that len includes the terminal null and the cursor | |
f2cc020d | 192 | * appears at pos + 1. |
d2aea95a MH |
193 | */ |
194 | pos = len; | |
195 | offset = 0; | |
196 | } | |
197 | ||
ab105a4f MH |
198 | /* And make a command string from argv array */ |
199 | p = command; | |
200 | for (i = 0; i < trace_probe_log.argc; i++) { | |
201 | len = strlen(trace_probe_log.argv[i]); | |
202 | strcpy(p, trace_probe_log.argv[i]); | |
203 | p[len] = ' '; | |
204 | p += len + 1; | |
205 | } | |
206 | *(p - 1) = '\0'; | |
207 | ||
2f754e77 | 208 | tracing_log_err(NULL, trace_probe_log.subsystem, command, |
ab105a4f MH |
209 | trace_probe_err_text, err_type, pos + offset); |
210 | ||
211 | kfree(command); | |
212 | } | |
213 | ||
8ab83f56 | 214 | /* Split symbol and offset. */ |
c5d343b6 | 215 | int traceprobe_split_symbol_offset(char *symbol, long *offset) |
8ab83f56 SD |
216 | { |
217 | char *tmp; | |
218 | int ret; | |
219 | ||
220 | if (!offset) | |
221 | return -EINVAL; | |
222 | ||
c5d343b6 | 223 | tmp = strpbrk(symbol, "+-"); |
8ab83f56 | 224 | if (tmp) { |
c5d343b6 | 225 | ret = kstrtol(tmp, 0, offset); |
8ab83f56 SD |
226 | if (ret) |
227 | return ret; | |
8ab83f56 SD |
228 | *tmp = '\0'; |
229 | } else | |
230 | *offset = 0; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
6212dd29 MH |
235 | /* @buf must has MAX_EVENT_NAME_LEN size */ |
236 | int traceprobe_parse_event_name(const char **pevent, const char **pgroup, | |
ab105a4f | 237 | char *buf, int offset) |
6212dd29 MH |
238 | { |
239 | const char *slash, *event = *pevent; | |
dec65d79 | 240 | int len; |
6212dd29 MH |
241 | |
242 | slash = strchr(event, '/'); | |
bc1b9734 SRV |
243 | if (!slash) |
244 | slash = strchr(event, '.'); | |
245 | ||
6212dd29 MH |
246 | if (slash) { |
247 | if (slash == event) { | |
ab105a4f | 248 | trace_probe_log_err(offset, NO_GROUP_NAME); |
6212dd29 MH |
249 | return -EINVAL; |
250 | } | |
251 | if (slash - event + 1 > MAX_EVENT_NAME_LEN) { | |
ab105a4f MH |
252 | trace_probe_log_err(offset, GROUP_TOO_LONG); |
253 | return -EINVAL; | |
6212dd29 MH |
254 | } |
255 | strlcpy(buf, event, slash - event + 1); | |
5b7a9622 | 256 | if (!is_good_name(buf)) { |
ab105a4f | 257 | trace_probe_log_err(offset, BAD_GROUP_NAME); |
5b7a9622 MH |
258 | return -EINVAL; |
259 | } | |
6212dd29 MH |
260 | *pgroup = buf; |
261 | *pevent = slash + 1; | |
ab105a4f | 262 | offset += slash - event + 1; |
dec65d79 | 263 | event = *pevent; |
6212dd29 | 264 | } |
dec65d79 MH |
265 | len = strlen(event); |
266 | if (len == 0) { | |
95c104c3 LY |
267 | if (slash) { |
268 | *pevent = NULL; | |
269 | return 0; | |
270 | } | |
ab105a4f | 271 | trace_probe_log_err(offset, NO_EVENT_NAME); |
6212dd29 | 272 | return -EINVAL; |
dec65d79 | 273 | } else if (len > MAX_EVENT_NAME_LEN) { |
ab105a4f MH |
274 | trace_probe_log_err(offset, EVENT_TOO_LONG); |
275 | return -EINVAL; | |
6212dd29 | 276 | } |
5b7a9622 | 277 | if (!is_good_name(event)) { |
ab105a4f | 278 | trace_probe_log_err(offset, BAD_EVENT_NAME); |
5b7a9622 MH |
279 | return -EINVAL; |
280 | } | |
6212dd29 MH |
281 | return 0; |
282 | } | |
283 | ||
8ab83f56 SD |
284 | #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long)) |
285 | ||
286 | static int parse_probe_vars(char *arg, const struct fetch_type *t, | |
ab105a4f | 287 | struct fetch_insn *code, unsigned int flags, int offs) |
8ab83f56 | 288 | { |
8ab83f56 | 289 | unsigned long param; |
3d739c1f SRV |
290 | int ret = 0; |
291 | int len; | |
8ab83f56 | 292 | |
2673c60e SRG |
293 | if (flags & TPARG_FL_TPOINT) { |
294 | if (code->data) | |
295 | return -EFAULT; | |
296 | code->data = kstrdup(arg, GFP_KERNEL); | |
297 | if (!code->data) | |
298 | return -ENOMEM; | |
299 | code->op = FETCH_OP_TP_ARG; | |
300 | } else if (strcmp(arg, "retval") == 0) { | |
ab105a4f | 301 | if (flags & TPARG_FL_RETURN) { |
53305928 | 302 | code->op = FETCH_OP_RETVAL; |
ab105a4f MH |
303 | } else { |
304 | trace_probe_log_err(offs, RETVAL_ON_PROBE); | |
8ab83f56 | 305 | ret = -EINVAL; |
ab105a4f | 306 | } |
3d739c1f SRV |
307 | } else if ((len = str_has_prefix(arg, "stack"))) { |
308 | if (arg[len] == '\0') { | |
53305928 | 309 | code->op = FETCH_OP_STACKP; |
3d739c1f SRV |
310 | } else if (isdigit(arg[len])) { |
311 | ret = kstrtoul(arg + len, 10, ¶m); | |
ab105a4f MH |
312 | if (ret) { |
313 | goto inval_var; | |
314 | } else if ((flags & TPARG_FL_KERNEL) && | |
315 | param > PARAM_MAX_STACK) { | |
316 | trace_probe_log_err(offs, BAD_STACK_NUM); | |
8ab83f56 | 317 | ret = -EINVAL; |
ab105a4f | 318 | } else { |
53305928 MH |
319 | code->op = FETCH_OP_STACK; |
320 | code->param = (unsigned int)param; | |
8ab83f56 SD |
321 | } |
322 | } else | |
ab105a4f | 323 | goto inval_var; |
ab838444 | 324 | } else if (strcmp(arg, "comm") == 0 || strcmp(arg, "COMM") == 0) { |
53305928 | 325 | code->op = FETCH_OP_COMM; |
a1303af5 MH |
326 | #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API |
327 | } else if (((flags & TPARG_FL_MASK) == | |
328 | (TPARG_FL_KERNEL | TPARG_FL_FENTRY)) && | |
3d739c1f | 329 | (len = str_has_prefix(arg, "arg"))) { |
3d739c1f | 330 | ret = kstrtoul(arg + len, 10, ¶m); |
ab105a4f MH |
331 | if (ret) { |
332 | goto inval_var; | |
333 | } else if (!param || param > PARAM_MAX_STACK) { | |
334 | trace_probe_log_err(offs, BAD_ARG_NUM); | |
a1303af5 | 335 | return -EINVAL; |
ab105a4f | 336 | } |
a1303af5 MH |
337 | code->op = FETCH_OP_ARG; |
338 | code->param = (unsigned int)param - 1; | |
339 | #endif | |
8ab83f56 | 340 | } else |
ab105a4f | 341 | goto inval_var; |
8ab83f56 SD |
342 | |
343 | return ret; | |
ab105a4f MH |
344 | |
345 | inval_var: | |
346 | trace_probe_log_err(offs, BAD_VAR); | |
347 | return -EINVAL; | |
8ab83f56 SD |
348 | } |
349 | ||
6218bf9f MH |
350 | static int str_to_immediate(char *str, unsigned long *imm) |
351 | { | |
352 | if (isdigit(str[0])) | |
353 | return kstrtoul(str, 0, imm); | |
354 | else if (str[0] == '-') | |
355 | return kstrtol(str, 0, (long *)imm); | |
356 | else if (str[0] == '+') | |
357 | return kstrtol(str + 1, 0, (long *)imm); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
a42e3c4d MH |
361 | static int __parse_imm_string(char *str, char **pbuf, int offs) |
362 | { | |
363 | size_t len = strlen(str); | |
364 | ||
365 | if (str[len - 1] != '"') { | |
366 | trace_probe_log_err(offs + len, IMMSTR_NO_CLOSE); | |
367 | return -EINVAL; | |
368 | } | |
369 | *pbuf = kstrndup(str, len - 1, GFP_KERNEL); | |
1c1857d4 XW |
370 | if (!*pbuf) |
371 | return -ENOMEM; | |
a42e3c4d MH |
372 | return 0; |
373 | } | |
374 | ||
8ab83f56 | 375 | /* Recursive argument parser */ |
53305928 MH |
376 | static int |
377 | parse_probe_arg(char *arg, const struct fetch_type *type, | |
378 | struct fetch_insn **pcode, struct fetch_insn *end, | |
ab105a4f | 379 | unsigned int flags, int offs) |
8ab83f56 | 380 | { |
53305928 | 381 | struct fetch_insn *code = *pcode; |
8ab83f56 | 382 | unsigned long param; |
e65f7ae7 | 383 | int deref = FETCH_OP_DEREF; |
bf173ca9 | 384 | long offset = 0; |
8ab83f56 | 385 | char *tmp; |
34fee3a1 | 386 | int ret = 0; |
8ab83f56 | 387 | |
8ab83f56 SD |
388 | switch (arg[0]) { |
389 | case '$': | |
ab105a4f | 390 | ret = parse_probe_vars(arg + 1, type, code, flags, offs); |
8ab83f56 SD |
391 | break; |
392 | ||
393 | case '%': /* named register */ | |
2673c60e SRG |
394 | if (flags & TPARG_FL_TPOINT) { |
395 | /* eprobes do not handle registers */ | |
396 | trace_probe_log_err(offs, BAD_VAR); | |
397 | break; | |
398 | } | |
8ab83f56 SD |
399 | ret = regs_query_register_offset(arg + 1); |
400 | if (ret >= 0) { | |
53305928 MH |
401 | code->op = FETCH_OP_REG; |
402 | code->param = (unsigned int)ret; | |
8ab83f56 | 403 | ret = 0; |
ab105a4f MH |
404 | } else |
405 | trace_probe_log_err(offs, BAD_REG_NAME); | |
8ab83f56 SD |
406 | break; |
407 | ||
b7e0bf34 | 408 | case '@': /* memory, file-offset or symbol */ |
8ab83f56 | 409 | if (isdigit(arg[1])) { |
bcd83ea6 | 410 | ret = kstrtoul(arg + 1, 0, ¶m); |
ab105a4f MH |
411 | if (ret) { |
412 | trace_probe_log_err(offs, BAD_MEM_ADDR); | |
8ab83f56 | 413 | break; |
ab105a4f | 414 | } |
53305928 MH |
415 | /* load address */ |
416 | code->op = FETCH_OP_IMM; | |
417 | code->immediate = param; | |
b7e0bf34 NK |
418 | } else if (arg[1] == '+') { |
419 | /* kprobes don't support file offsets */ | |
ab105a4f MH |
420 | if (flags & TPARG_FL_KERNEL) { |
421 | trace_probe_log_err(offs, FILE_ON_KPROBE); | |
b7e0bf34 | 422 | return -EINVAL; |
ab105a4f | 423 | } |
b7e0bf34 | 424 | ret = kstrtol(arg + 2, 0, &offset); |
ab105a4f MH |
425 | if (ret) { |
426 | trace_probe_log_err(offs, BAD_FILE_OFFS); | |
b7e0bf34 | 427 | break; |
ab105a4f | 428 | } |
b7e0bf34 | 429 | |
53305928 MH |
430 | code->op = FETCH_OP_FOFFS; |
431 | code->immediate = (unsigned long)offset; // imm64? | |
8ab83f56 | 432 | } else { |
b079d374 | 433 | /* uprobes don't support symbols */ |
ab105a4f MH |
434 | if (!(flags & TPARG_FL_KERNEL)) { |
435 | trace_probe_log_err(offs, SYM_ON_UPROBE); | |
b079d374 | 436 | return -EINVAL; |
ab105a4f | 437 | } |
a6682814 MH |
438 | /* Preserve symbol for updating */ |
439 | code->op = FETCH_NOP_SYMBOL; | |
440 | code->data = kstrdup(arg + 1, GFP_KERNEL); | |
441 | if (!code->data) | |
442 | return -ENOMEM; | |
ab105a4f MH |
443 | if (++code == end) { |
444 | trace_probe_log_err(offs, TOO_MANY_OPS); | |
445 | return -EINVAL; | |
446 | } | |
53305928 | 447 | code->op = FETCH_OP_IMM; |
a6682814 | 448 | code->immediate = 0; |
8ab83f56 | 449 | } |
53305928 | 450 | /* These are fetching from memory */ |
ab105a4f MH |
451 | if (++code == end) { |
452 | trace_probe_log_err(offs, TOO_MANY_OPS); | |
453 | return -EINVAL; | |
454 | } | |
53305928 MH |
455 | *pcode = code; |
456 | code->op = FETCH_OP_DEREF; | |
457 | code->offset = offset; | |
8ab83f56 SD |
458 | break; |
459 | ||
460 | case '+': /* deref memory */ | |
8ab83f56 | 461 | case '-': |
e65f7ae7 MH |
462 | if (arg[1] == 'u') { |
463 | deref = FETCH_OP_UDEREF; | |
464 | arg[1] = arg[0]; | |
465 | arg++; | |
466 | } | |
467 | if (arg[0] == '+') | |
468 | arg++; /* Skip '+', because kstrtol() rejects it. */ | |
8ab83f56 | 469 | tmp = strchr(arg, '('); |
ab105a4f MH |
470 | if (!tmp) { |
471 | trace_probe_log_err(offs, DEREF_NEED_BRACE); | |
53305928 | 472 | return -EINVAL; |
ab105a4f | 473 | } |
8ab83f56 | 474 | *tmp = '\0'; |
bcd83ea6 | 475 | ret = kstrtol(arg, 0, &offset); |
ab105a4f MH |
476 | if (ret) { |
477 | trace_probe_log_err(offs, BAD_DEREF_OFFS); | |
8ab83f56 | 478 | break; |
ab105a4f MH |
479 | } |
480 | offs += (tmp + 1 - arg) + (arg[0] != '-' ? 1 : 0); | |
8ab83f56 SD |
481 | arg = tmp + 1; |
482 | tmp = strrchr(arg, ')'); | |
ab105a4f MH |
483 | if (!tmp) { |
484 | trace_probe_log_err(offs + strlen(arg), | |
485 | DEREF_OPEN_BRACE); | |
486 | return -EINVAL; | |
487 | } else { | |
d4505aa6 | 488 | const struct fetch_type *t2 = find_fetch_type(NULL, flags); |
8ab83f56 | 489 | |
8ab83f56 | 490 | *tmp = '\0'; |
ab105a4f | 491 | ret = parse_probe_arg(arg, t2, &code, end, flags, offs); |
8ab83f56 | 492 | if (ret) |
53305928 | 493 | break; |
a42e3c4d MH |
494 | if (code->op == FETCH_OP_COMM || |
495 | code->op == FETCH_OP_DATA) { | |
ab105a4f MH |
496 | trace_probe_log_err(offs, COMM_CANT_DEREF); |
497 | return -EINVAL; | |
498 | } | |
499 | if (++code == end) { | |
500 | trace_probe_log_err(offs, TOO_MANY_OPS); | |
53305928 | 501 | return -EINVAL; |
ab105a4f | 502 | } |
53305928 MH |
503 | *pcode = code; |
504 | ||
e65f7ae7 | 505 | code->op = deref; |
53305928 | 506 | code->offset = offset; |
8ab83f56 SD |
507 | } |
508 | break; | |
6218bf9f | 509 | case '\\': /* Immediate value */ |
a42e3c4d MH |
510 | if (arg[1] == '"') { /* Immediate string */ |
511 | ret = __parse_imm_string(arg + 2, &tmp, offs + 2); | |
512 | if (ret) | |
513 | break; | |
514 | code->op = FETCH_OP_DATA; | |
515 | code->data = tmp; | |
516 | } else { | |
517 | ret = str_to_immediate(arg + 1, &code->immediate); | |
518 | if (ret) | |
519 | trace_probe_log_err(offs + 1, BAD_IMM); | |
520 | else | |
521 | code->op = FETCH_OP_IMM; | |
522 | } | |
6218bf9f | 523 | break; |
8ab83f56 | 524 | } |
53305928 MH |
525 | if (!ret && code->op == FETCH_OP_NOP) { |
526 | /* Parsed, but do not find fetch method */ | |
ab105a4f | 527 | trace_probe_log_err(offs, BAD_FETCH_ARG); |
8ab83f56 SD |
528 | ret = -EINVAL; |
529 | } | |
8ab83f56 SD |
530 | return ret; |
531 | } | |
532 | ||
533 | #define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long)) | |
534 | ||
535 | /* Bitfield type needs to be parsed into a fetch function */ | |
536 | static int __parse_bitfield_probe_arg(const char *bf, | |
537 | const struct fetch_type *t, | |
53305928 | 538 | struct fetch_insn **pcode) |
8ab83f56 | 539 | { |
53305928 | 540 | struct fetch_insn *code = *pcode; |
8ab83f56 SD |
541 | unsigned long bw, bo; |
542 | char *tail; | |
543 | ||
544 | if (*bf != 'b') | |
545 | return 0; | |
546 | ||
8ab83f56 SD |
547 | bw = simple_strtoul(bf + 1, &tail, 0); /* Use simple one */ |
548 | ||
549 | if (bw == 0 || *tail != '@') | |
550 | return -EINVAL; | |
551 | ||
552 | bf = tail + 1; | |
553 | bo = simple_strtoul(bf, &tail, 0); | |
554 | ||
555 | if (tail == bf || *tail != '/') | |
556 | return -EINVAL; | |
53305928 MH |
557 | code++; |
558 | if (code->op != FETCH_OP_NOP) | |
ab105a4f | 559 | return -EINVAL; |
53305928 | 560 | *pcode = code; |
8ab83f56 | 561 | |
53305928 MH |
562 | code->op = FETCH_OP_MOD_BF; |
563 | code->lshift = BYTES_TO_BITS(t->size) - (bw + bo); | |
564 | code->rshift = BYTES_TO_BITS(t->size) - bw; | |
565 | code->basesize = t->size; | |
8ab83f56 SD |
566 | |
567 | return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0; | |
568 | } | |
569 | ||
570 | /* String length checking wrapper */ | |
fcd9db51 | 571 | static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, |
ab105a4f | 572 | struct probe_arg *parg, unsigned int flags, int offset) |
8ab83f56 | 573 | { |
40b53b77 | 574 | struct fetch_insn *code, *scode, *tmp = NULL; |
ab105a4f | 575 | char *t, *t2, *t3; |
fcd9db51 | 576 | char *arg; |
40b53b77 | 577 | int ret, len; |
8ab83f56 | 578 | |
fcd9db51 SRV |
579 | arg = kstrdup(argv, GFP_KERNEL); |
580 | if (!arg) | |
581 | return -ENOMEM; | |
582 | ||
583 | ret = -EINVAL; | |
ab105a4f MH |
584 | len = strlen(arg); |
585 | if (len > MAX_ARGSTR_LEN) { | |
586 | trace_probe_log_err(offset, ARG_TOO_LONG); | |
fcd9db51 | 587 | goto out; |
ab105a4f MH |
588 | } else if (len == 0) { |
589 | trace_probe_log_err(offset, NO_ARG_BODY); | |
fcd9db51 | 590 | goto out; |
8ab83f56 | 591 | } |
ab105a4f | 592 | |
fcd9db51 | 593 | ret = -ENOMEM; |
8ab83f56 | 594 | parg->comm = kstrdup(arg, GFP_KERNEL); |
ab105a4f | 595 | if (!parg->comm) |
fcd9db51 | 596 | goto out; |
ab105a4f | 597 | |
fcd9db51 | 598 | ret = -EINVAL; |
40b53b77 | 599 | t = strchr(arg, ':'); |
8ab83f56 | 600 | if (t) { |
40b53b77 MH |
601 | *t = '\0'; |
602 | t2 = strchr(++t, '['); | |
603 | if (t2) { | |
ab105a4f MH |
604 | *t2++ = '\0'; |
605 | t3 = strchr(t2, ']'); | |
606 | if (!t3) { | |
607 | offset += t2 + strlen(t2) - arg; | |
608 | trace_probe_log_err(offset, | |
609 | ARRAY_NO_CLOSE); | |
fcd9db51 | 610 | goto out; |
ab105a4f MH |
611 | } else if (t3[1] != '\0') { |
612 | trace_probe_log_err(offset + t3 + 1 - arg, | |
613 | BAD_ARRAY_SUFFIX); | |
fcd9db51 | 614 | goto out; |
ab105a4f MH |
615 | } |
616 | *t3 = '\0'; | |
617 | if (kstrtouint(t2, 0, &parg->count) || !parg->count) { | |
618 | trace_probe_log_err(offset + t2 - arg, | |
619 | BAD_ARRAY_NUM); | |
fcd9db51 | 620 | goto out; |
ab105a4f MH |
621 | } |
622 | if (parg->count > MAX_ARRAY_LEN) { | |
623 | trace_probe_log_err(offset + t2 - arg, | |
624 | ARRAY_TOO_BIG); | |
fcd9db51 | 625 | goto out; |
ab105a4f | 626 | } |
40b53b77 | 627 | } |
8ab83f56 | 628 | } |
3dd1f7f2 | 629 | |
a42e3c4d | 630 | /* |
f2cc020d | 631 | * Since $comm and immediate string can not be dereferenced, |
02333de9 | 632 | * we can find those by strcmp. But ignore for eprobes. |
a42e3c4d | 633 | */ |
02333de9 | 634 | if (!(flags & TPARG_FL_TPOINT) && |
ab838444 SRG |
635 | (strcmp(arg, "$comm") == 0 || strcmp(arg, "$COMM") == 0 || |
636 | strncmp(arg, "\\\"", 2) == 0)) { | |
3dd1f7f2 MH |
637 | /* The type of $comm must be "string", and not an array. */ |
638 | if (parg->count || (t && strcmp(t, "string"))) | |
fcd9db51 | 639 | goto out; |
d4505aa6 | 640 | parg->type = find_fetch_type("string", flags); |
3dd1f7f2 | 641 | } else |
d4505aa6 | 642 | parg->type = find_fetch_type(t, flags); |
8ab83f56 | 643 | if (!parg->type) { |
ab105a4f | 644 | trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE); |
fcd9db51 | 645 | goto out; |
8ab83f56 SD |
646 | } |
647 | parg->offset = *size; | |
40b53b77 MH |
648 | *size += parg->type->size * (parg->count ?: 1); |
649 | ||
fcd9db51 | 650 | ret = -ENOMEM; |
40b53b77 MH |
651 | if (parg->count) { |
652 | len = strlen(parg->type->fmttype) + 6; | |
653 | parg->fmt = kmalloc(len, GFP_KERNEL); | |
654 | if (!parg->fmt) | |
fcd9db51 | 655 | goto out; |
40b53b77 MH |
656 | snprintf(parg->fmt, len, "%s[%d]", parg->type->fmttype, |
657 | parg->count); | |
658 | } | |
8ab83f56 | 659 | |
8623b006 | 660 | code = tmp = kcalloc(FETCH_INSN_MAX, sizeof(*code), GFP_KERNEL); |
53305928 | 661 | if (!code) |
fcd9db51 | 662 | goto out; |
53305928 MH |
663 | code[FETCH_INSN_MAX - 1].op = FETCH_OP_END; |
664 | ||
665 | ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1], | |
ab105a4f | 666 | flags, offset); |
53305928 MH |
667 | if (ret) |
668 | goto fail; | |
669 | ||
fcd9db51 | 670 | ret = -EINVAL; |
53305928 | 671 | /* Store operation */ |
b26a124c MHG |
672 | if (parg->type->is_string) { |
673 | if (!strcmp(parg->type->name, "symstr")) { | |
674 | if (code->op != FETCH_OP_REG && code->op != FETCH_OP_STACK && | |
675 | code->op != FETCH_OP_RETVAL && code->op != FETCH_OP_ARG && | |
676 | code->op != FETCH_OP_DEREF && code->op != FETCH_OP_TP_ARG) { | |
677 | trace_probe_log_err(offset + (t ? (t - arg) : 0), | |
678 | BAD_SYMSTRING); | |
679 | goto fail; | |
680 | } | |
681 | } else { | |
682 | if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF && | |
683 | code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM && | |
684 | code->op != FETCH_OP_DATA && code->op != FETCH_OP_TP_ARG) { | |
685 | trace_probe_log_err(offset + (t ? (t - arg) : 0), | |
686 | BAD_STRING); | |
687 | goto fail; | |
688 | } | |
53305928 | 689 | } |
b26a124c MHG |
690 | if (!strcmp(parg->type->name, "symstr") || |
691 | (code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM || | |
7491e2c4 TSV |
692 | code->op == FETCH_OP_DATA) || code->op == FETCH_OP_TP_ARG || |
693 | parg->count) { | |
40b53b77 | 694 | /* |
a42e3c4d MH |
695 | * IMM, DATA and COMM is pointing actual address, those |
696 | * must be kept, and if parg->count != 0, this is an | |
697 | * array of string pointers instead of string address | |
698 | * itself. | |
b26a124c MHG |
699 | * For the symstr, it doesn't need to dereference, thus |
700 | * it just get the value. | |
40b53b77 | 701 | */ |
53305928 | 702 | code++; |
40b53b77 | 703 | if (code->op != FETCH_OP_NOP) { |
ab105a4f | 704 | trace_probe_log_err(offset, TOO_MANY_OPS); |
40b53b77 MH |
705 | goto fail; |
706 | } | |
707 | } | |
88903c46 | 708 | /* If op == DEREF, replace it with STRING */ |
e65f7ae7 MH |
709 | if (!strcmp(parg->type->name, "ustring") || |
710 | code->op == FETCH_OP_UDEREF) | |
88903c46 | 711 | code->op = FETCH_OP_ST_USTRING; |
b26a124c MHG |
712 | else if (!strcmp(parg->type->name, "symstr")) |
713 | code->op = FETCH_OP_ST_SYMSTR; | |
88903c46 MH |
714 | else |
715 | code->op = FETCH_OP_ST_STRING; | |
40b53b77 | 716 | code->size = parg->type->size; |
53305928 MH |
717 | parg->dynamic = true; |
718 | } else if (code->op == FETCH_OP_DEREF) { | |
719 | code->op = FETCH_OP_ST_MEM; | |
720 | code->size = parg->type->size; | |
e65f7ae7 MH |
721 | } else if (code->op == FETCH_OP_UDEREF) { |
722 | code->op = FETCH_OP_ST_UMEM; | |
723 | code->size = parg->type->size; | |
53305928 MH |
724 | } else { |
725 | code++; | |
726 | if (code->op != FETCH_OP_NOP) { | |
ab105a4f | 727 | trace_probe_log_err(offset, TOO_MANY_OPS); |
53305928 MH |
728 | goto fail; |
729 | } | |
730 | code->op = FETCH_OP_ST_RAW; | |
731 | code->size = parg->type->size; | |
732 | } | |
40b53b77 | 733 | scode = code; |
53305928 MH |
734 | /* Modify operation */ |
735 | if (t != NULL) { | |
736 | ret = __parse_bitfield_probe_arg(t, parg->type, &code); | |
ab105a4f MH |
737 | if (ret) { |
738 | trace_probe_log_err(offset + t - arg, BAD_BITFIELD); | |
53305928 | 739 | goto fail; |
ab105a4f | 740 | } |
8ab83f56 | 741 | } |
fcd9db51 | 742 | ret = -EINVAL; |
40b53b77 MH |
743 | /* Loop(Array) operation */ |
744 | if (parg->count) { | |
745 | if (scode->op != FETCH_OP_ST_MEM && | |
88903c46 MH |
746 | scode->op != FETCH_OP_ST_STRING && |
747 | scode->op != FETCH_OP_ST_USTRING) { | |
ab105a4f MH |
748 | trace_probe_log_err(offset + (t ? (t - arg) : 0), |
749 | BAD_STRING); | |
40b53b77 MH |
750 | goto fail; |
751 | } | |
752 | code++; | |
753 | if (code->op != FETCH_OP_NOP) { | |
ab105a4f | 754 | trace_probe_log_err(offset, TOO_MANY_OPS); |
40b53b77 MH |
755 | goto fail; |
756 | } | |
757 | code->op = FETCH_OP_LP_ARRAY; | |
758 | code->param = parg->count; | |
759 | } | |
53305928 MH |
760 | code++; |
761 | code->op = FETCH_OP_END; | |
762 | ||
fcd9db51 | 763 | ret = 0; |
53305928 | 764 | /* Shrink down the code buffer */ |
8623b006 | 765 | parg->code = kcalloc(code - tmp + 1, sizeof(*code), GFP_KERNEL); |
53305928 MH |
766 | if (!parg->code) |
767 | ret = -ENOMEM; | |
768 | else | |
769 | memcpy(parg->code, tmp, sizeof(*code) * (code - tmp + 1)); | |
770 | ||
771 | fail: | |
a6682814 MH |
772 | if (ret) { |
773 | for (code = tmp; code < tmp + FETCH_INSN_MAX; code++) | |
a42e3c4d MH |
774 | if (code->op == FETCH_NOP_SYMBOL || |
775 | code->op == FETCH_OP_DATA) | |
a6682814 MH |
776 | kfree(code->data); |
777 | } | |
53305928 | 778 | kfree(tmp); |
fcd9db51 SRV |
779 | out: |
780 | kfree(arg); | |
8ab83f56 SD |
781 | |
782 | return ret; | |
783 | } | |
784 | ||
785 | /* Return 1 if name is reserved or already used by another argument */ | |
d00bbea9 MH |
786 | static int traceprobe_conflict_field_name(const char *name, |
787 | struct probe_arg *args, int narg) | |
8ab83f56 SD |
788 | { |
789 | int i; | |
790 | ||
791 | for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++) | |
792 | if (strcmp(reserved_field_names[i], name) == 0) | |
793 | return 1; | |
794 | ||
795 | for (i = 0; i < narg; i++) | |
796 | if (strcmp(args[i].name, name) == 0) | |
797 | return 1; | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
fcd9db51 | 802 | int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, const char *arg, |
d00bbea9 MH |
803 | unsigned int flags) |
804 | { | |
805 | struct probe_arg *parg = &tp->args[i]; | |
fcd9db51 | 806 | const char *body; |
d00bbea9 MH |
807 | |
808 | /* Increment count for freeing args in error case */ | |
809 | tp->nr_args++; | |
810 | ||
811 | body = strchr(arg, '='); | |
812 | if (body) { | |
ab105a4f MH |
813 | if (body - arg > MAX_ARG_NAME_LEN) { |
814 | trace_probe_log_err(0, ARG_NAME_TOO_LONG); | |
815 | return -EINVAL; | |
816 | } else if (body == arg) { | |
817 | trace_probe_log_err(0, NO_ARG_NAME); | |
b4443c17 | 818 | return -EINVAL; |
ab105a4f | 819 | } |
d00bbea9 MH |
820 | parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL); |
821 | body++; | |
822 | } else { | |
823 | /* If argument name is omitted, set "argN" */ | |
824 | parg->name = kasprintf(GFP_KERNEL, "arg%d", i + 1); | |
825 | body = arg; | |
826 | } | |
827 | if (!parg->name) | |
828 | return -ENOMEM; | |
829 | ||
830 | if (!is_good_name(parg->name)) { | |
ab105a4f | 831 | trace_probe_log_err(0, BAD_ARG_NAME); |
d00bbea9 MH |
832 | return -EINVAL; |
833 | } | |
d00bbea9 | 834 | if (traceprobe_conflict_field_name(parg->name, tp->args, i)) { |
ab105a4f | 835 | trace_probe_log_err(0, USED_ARG_NAME); |
d00bbea9 MH |
836 | return -EINVAL; |
837 | } | |
d00bbea9 | 838 | /* Parse fetch argument */ |
ab105a4f MH |
839 | return traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags, |
840 | body - arg); | |
d00bbea9 MH |
841 | } |
842 | ||
8ab83f56 SD |
843 | void traceprobe_free_probe_arg(struct probe_arg *arg) |
844 | { | |
a6682814 MH |
845 | struct fetch_insn *code = arg->code; |
846 | ||
847 | while (code && code->op != FETCH_OP_END) { | |
a42e3c4d MH |
848 | if (code->op == FETCH_NOP_SYMBOL || |
849 | code->op == FETCH_OP_DATA) | |
a6682814 MH |
850 | kfree(code->data); |
851 | code++; | |
852 | } | |
53305928 | 853 | kfree(arg->code); |
8ab83f56 SD |
854 | kfree(arg->name); |
855 | kfree(arg->comm); | |
40b53b77 | 856 | kfree(arg->fmt); |
8ab83f56 SD |
857 | } |
858 | ||
a6682814 MH |
859 | int traceprobe_update_arg(struct probe_arg *arg) |
860 | { | |
861 | struct fetch_insn *code = arg->code; | |
862 | long offset; | |
863 | char *tmp; | |
864 | char c; | |
865 | int ret = 0; | |
866 | ||
867 | while (code && code->op != FETCH_OP_END) { | |
868 | if (code->op == FETCH_NOP_SYMBOL) { | |
869 | if (code[1].op != FETCH_OP_IMM) | |
870 | return -EINVAL; | |
871 | ||
ee474b81 | 872 | tmp = strpbrk(code->data, "+-"); |
a6682814 MH |
873 | if (tmp) |
874 | c = *tmp; | |
875 | ret = traceprobe_split_symbol_offset(code->data, | |
876 | &offset); | |
877 | if (ret) | |
878 | return ret; | |
879 | ||
880 | code[1].immediate = | |
881 | (unsigned long)kallsyms_lookup_name(code->data); | |
882 | if (tmp) | |
883 | *tmp = c; | |
884 | if (!code[1].immediate) | |
885 | return -ENOENT; | |
886 | code[1].immediate += offset; | |
887 | } | |
888 | code++; | |
889 | } | |
890 | return 0; | |
891 | } | |
892 | ||
40b53b77 MH |
893 | /* When len=0, we just calculate the needed length */ |
894 | #define LEN_OR_ZERO (len ? len - pos : 0) | |
5bf652aa | 895 | static int __set_print_fmt(struct trace_probe *tp, char *buf, int len, |
007517a0 | 896 | enum probe_print_type ptype) |
5bf652aa | 897 | { |
40b53b77 MH |
898 | struct probe_arg *parg; |
899 | int i, j; | |
5bf652aa | 900 | int pos = 0; |
5bf652aa NK |
901 | const char *fmt, *arg; |
902 | ||
007517a0 SRV |
903 | switch (ptype) { |
904 | case PROBE_PRINT_NORMAL: | |
5bf652aa | 905 | fmt = "(%lx)"; |
b61edd57 | 906 | arg = ", REC->" FIELD_STRING_IP; |
007517a0 SRV |
907 | break; |
908 | case PROBE_PRINT_RETURN: | |
5bf652aa | 909 | fmt = "(%lx <- %lx)"; |
b61edd57 | 910 | arg = ", REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP; |
007517a0 | 911 | break; |
7491e2c4 | 912 | case PROBE_PRINT_EVENT: |
b61edd57 SRG |
913 | fmt = ""; |
914 | arg = ""; | |
7491e2c4 | 915 | break; |
007517a0 SRV |
916 | default: |
917 | WARN_ON_ONCE(1); | |
918 | return 0; | |
5bf652aa NK |
919 | } |
920 | ||
5bf652aa NK |
921 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt); |
922 | ||
923 | for (i = 0; i < tp->nr_args; i++) { | |
40b53b77 MH |
924 | parg = tp->args + i; |
925 | pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=", parg->name); | |
926 | if (parg->count) { | |
927 | pos += snprintf(buf + pos, LEN_OR_ZERO, "{%s", | |
928 | parg->type->fmt); | |
929 | for (j = 1; j < parg->count; j++) | |
930 | pos += snprintf(buf + pos, LEN_OR_ZERO, ",%s", | |
931 | parg->type->fmt); | |
932 | pos += snprintf(buf + pos, LEN_OR_ZERO, "}"); | |
933 | } else | |
934 | pos += snprintf(buf + pos, LEN_OR_ZERO, "%s", | |
935 | parg->type->fmt); | |
5bf652aa NK |
936 | } |
937 | ||
b61edd57 | 938 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", arg); |
5bf652aa NK |
939 | |
940 | for (i = 0; i < tp->nr_args; i++) { | |
40b53b77 MH |
941 | parg = tp->args + i; |
942 | if (parg->count) { | |
b26a124c | 943 | if (parg->type->is_string) |
40b53b77 MH |
944 | fmt = ", __get_str(%s[%d])"; |
945 | else | |
946 | fmt = ", REC->%s[%d]"; | |
947 | for (j = 0; j < parg->count; j++) | |
948 | pos += snprintf(buf + pos, LEN_OR_ZERO, | |
949 | fmt, parg->name, j); | |
950 | } else { | |
b26a124c | 951 | if (parg->type->is_string) |
40b53b77 MH |
952 | fmt = ", __get_str(%s)"; |
953 | else | |
954 | fmt = ", REC->%s"; | |
5bf652aa | 955 | pos += snprintf(buf + pos, LEN_OR_ZERO, |
40b53b77 MH |
956 | fmt, parg->name); |
957 | } | |
5bf652aa NK |
958 | } |
959 | ||
5bf652aa NK |
960 | /* return the length of print_fmt */ |
961 | return pos; | |
962 | } | |
40b53b77 | 963 | #undef LEN_OR_ZERO |
5bf652aa | 964 | |
007517a0 | 965 | int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype) |
5bf652aa | 966 | { |
e3dc9f89 | 967 | struct trace_event_call *call = trace_probe_event_call(tp); |
5bf652aa NK |
968 | int len; |
969 | char *print_fmt; | |
970 | ||
971 | /* First: called with 0 length to calculate the needed length */ | |
007517a0 | 972 | len = __set_print_fmt(tp, NULL, 0, ptype); |
5bf652aa NK |
973 | print_fmt = kmalloc(len + 1, GFP_KERNEL); |
974 | if (!print_fmt) | |
975 | return -ENOMEM; | |
976 | ||
977 | /* Second: actually write the @print_fmt */ | |
007517a0 | 978 | __set_print_fmt(tp, print_fmt, len + 1, ptype); |
e3dc9f89 | 979 | call->print_fmt = print_fmt; |
5bf652aa NK |
980 | |
981 | return 0; | |
982 | } | |
eeb07b06 MH |
983 | |
984 | int traceprobe_define_arg_fields(struct trace_event_call *event_call, | |
985 | size_t offset, struct trace_probe *tp) | |
986 | { | |
987 | int ret, i; | |
988 | ||
989 | /* Set argument names as fields */ | |
990 | for (i = 0; i < tp->nr_args; i++) { | |
991 | struct probe_arg *parg = &tp->args[i]; | |
40b53b77 MH |
992 | const char *fmt = parg->type->fmttype; |
993 | int size = parg->type->size; | |
994 | ||
995 | if (parg->fmt) | |
996 | fmt = parg->fmt; | |
997 | if (parg->count) | |
998 | size *= parg->count; | |
999 | ret = trace_define_field(event_call, fmt, parg->name, | |
1000 | offset + parg->offset, size, | |
eeb07b06 MH |
1001 | parg->type->is_signed, |
1002 | FILTER_OTHER); | |
1003 | if (ret) | |
1004 | return ret; | |
1005 | } | |
1006 | return 0; | |
1007 | } | |
455b2899 | 1008 | |
ca89bc07 MH |
1009 | static void trace_probe_event_free(struct trace_probe_event *tpe) |
1010 | { | |
1011 | kfree(tpe->class.system); | |
1012 | kfree(tpe->call.name); | |
1013 | kfree(tpe->call.print_fmt); | |
1014 | kfree(tpe); | |
1015 | } | |
1016 | ||
1017 | int trace_probe_append(struct trace_probe *tp, struct trace_probe *to) | |
1018 | { | |
1019 | if (trace_probe_has_sibling(tp)) | |
1020 | return -EBUSY; | |
1021 | ||
1022 | list_del_init(&tp->list); | |
1023 | trace_probe_event_free(tp->event); | |
1024 | ||
1025 | tp->event = to->event; | |
1026 | list_add_tail(&tp->list, trace_probe_probe_list(to)); | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | void trace_probe_unlink(struct trace_probe *tp) | |
1032 | { | |
1033 | list_del_init(&tp->list); | |
1034 | if (list_empty(trace_probe_probe_list(tp))) | |
1035 | trace_probe_event_free(tp->event); | |
1036 | tp->event = NULL; | |
1037 | } | |
455b2899 MH |
1038 | |
1039 | void trace_probe_cleanup(struct trace_probe *tp) | |
1040 | { | |
1041 | int i; | |
1042 | ||
1043 | for (i = 0; i < tp->nr_args; i++) | |
1044 | traceprobe_free_probe_arg(&tp->args[i]); | |
1045 | ||
ca89bc07 MH |
1046 | if (tp->event) |
1047 | trace_probe_unlink(tp); | |
455b2899 MH |
1048 | } |
1049 | ||
1050 | int trace_probe_init(struct trace_probe *tp, const char *event, | |
b61387cb | 1051 | const char *group, bool alloc_filter) |
455b2899 | 1052 | { |
60d53e2c | 1053 | struct trace_event_call *call; |
b61387cb | 1054 | size_t size = sizeof(struct trace_probe_event); |
60d53e2c | 1055 | int ret = 0; |
e3dc9f89 | 1056 | |
455b2899 MH |
1057 | if (!event || !group) |
1058 | return -EINVAL; | |
1059 | ||
b61387cb MH |
1060 | if (alloc_filter) |
1061 | size += sizeof(struct trace_uprobe_filter); | |
1062 | ||
1063 | tp->event = kzalloc(size, GFP_KERNEL); | |
60d53e2c | 1064 | if (!tp->event) |
455b2899 MH |
1065 | return -ENOMEM; |
1066 | ||
d59fae6f MH |
1067 | INIT_LIST_HEAD(&tp->event->files); |
1068 | INIT_LIST_HEAD(&tp->event->class.fields); | |
1069 | INIT_LIST_HEAD(&tp->event->probes); | |
1070 | INIT_LIST_HEAD(&tp->list); | |
fc9d276f | 1071 | list_add(&tp->list, &tp->event->probes); |
d59fae6f | 1072 | |
60d53e2c MH |
1073 | call = trace_probe_event_call(tp); |
1074 | call->class = &tp->event->class; | |
1075 | call->name = kstrdup(event, GFP_KERNEL); | |
1076 | if (!call->name) { | |
1077 | ret = -ENOMEM; | |
1078 | goto error; | |
1079 | } | |
1080 | ||
1081 | tp->event->class.system = kstrdup(group, GFP_KERNEL); | |
1082 | if (!tp->event->class.system) { | |
1083 | ret = -ENOMEM; | |
1084 | goto error; | |
455b2899 | 1085 | } |
455b2899 MH |
1086 | |
1087 | return 0; | |
60d53e2c MH |
1088 | |
1089 | error: | |
1090 | trace_probe_cleanup(tp); | |
1091 | return ret; | |
455b2899 | 1092 | } |
46e5376d | 1093 | |
8e242060 MH |
1094 | static struct trace_event_call * |
1095 | find_trace_event_call(const char *system, const char *event_name) | |
1096 | { | |
1097 | struct trace_event_call *tp_event; | |
1098 | const char *name; | |
1099 | ||
1100 | list_for_each_entry(tp_event, &ftrace_events, list) { | |
1101 | if (!tp_event->class->system || | |
1102 | strcmp(system, tp_event->class->system)) | |
1103 | continue; | |
1104 | name = trace_event_name(tp_event); | |
1105 | if (!name || strcmp(event_name, name)) | |
1106 | continue; | |
1107 | return tp_event; | |
1108 | } | |
1109 | ||
1110 | return NULL; | |
1111 | } | |
1112 | ||
46e5376d MH |
1113 | int trace_probe_register_event_call(struct trace_probe *tp) |
1114 | { | |
e3dc9f89 | 1115 | struct trace_event_call *call = trace_probe_event_call(tp); |
46e5376d MH |
1116 | int ret; |
1117 | ||
8e242060 MH |
1118 | lockdep_assert_held(&event_mutex); |
1119 | ||
1120 | if (find_trace_event_call(trace_probe_group_name(tp), | |
1121 | trace_probe_name(tp))) | |
1122 | return -EEXIST; | |
1123 | ||
46e5376d MH |
1124 | ret = register_trace_event(&call->event); |
1125 | if (!ret) | |
1126 | return -ENODEV; | |
1127 | ||
1128 | ret = trace_add_event_call(call); | |
1129 | if (ret) | |
1130 | unregister_trace_event(&call->event); | |
1131 | ||
1132 | return ret; | |
1133 | } | |
b5f935ee MH |
1134 | |
1135 | int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file) | |
1136 | { | |
1137 | struct event_file_link *link; | |
1138 | ||
1139 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
1140 | if (!link) | |
1141 | return -ENOMEM; | |
1142 | ||
1143 | link->file = file; | |
1144 | INIT_LIST_HEAD(&link->list); | |
60d53e2c | 1145 | list_add_tail_rcu(&link->list, &tp->event->files); |
747774d6 | 1146 | trace_probe_set_flag(tp, TP_FLAG_TRACE); |
b5f935ee MH |
1147 | return 0; |
1148 | } | |
1149 | ||
1150 | struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp, | |
1151 | struct trace_event_file *file) | |
1152 | { | |
1153 | struct event_file_link *link; | |
1154 | ||
1155 | trace_probe_for_each_link(link, tp) { | |
1156 | if (link->file == file) | |
1157 | return link; | |
1158 | } | |
1159 | ||
1160 | return NULL; | |
1161 | } | |
1162 | ||
1163 | int trace_probe_remove_file(struct trace_probe *tp, | |
1164 | struct trace_event_file *file) | |
1165 | { | |
1166 | struct event_file_link *link; | |
1167 | ||
1168 | link = trace_probe_get_file_link(tp, file); | |
1169 | if (!link) | |
1170 | return -ENOENT; | |
1171 | ||
1172 | list_del_rcu(&link->list); | |
a6ed2aee | 1173 | kvfree_rcu(link); |
b5f935ee | 1174 | |
60d53e2c | 1175 | if (list_empty(&tp->event->files)) |
747774d6 | 1176 | trace_probe_clear_flag(tp, TP_FLAG_TRACE); |
b5f935ee MH |
1177 | |
1178 | return 0; | |
1179 | } | |
ca89bc07 MH |
1180 | |
1181 | /* | |
1182 | * Return the smallest index of different type argument (start from 1). | |
1183 | * If all argument types and name are same, return 0. | |
1184 | */ | |
1185 | int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b) | |
1186 | { | |
1187 | int i; | |
1188 | ||
d2aea95a MH |
1189 | /* In case of more arguments */ |
1190 | if (a->nr_args < b->nr_args) | |
1191 | return a->nr_args + 1; | |
1192 | if (a->nr_args > b->nr_args) | |
1193 | return b->nr_args + 1; | |
1194 | ||
ca89bc07 MH |
1195 | for (i = 0; i < a->nr_args; i++) { |
1196 | if ((b->nr_args <= i) || | |
1197 | ((a->args[i].type != b->args[i].type) || | |
1198 | (a->args[i].count != b->args[i].count) || | |
1199 | strcmp(a->args[i].name, b->args[i].name))) | |
1200 | return i + 1; | |
1201 | } | |
1202 | ||
1203 | return 0; | |
1204 | } | |
eb5bf813 MH |
1205 | |
1206 | bool trace_probe_match_command_args(struct trace_probe *tp, | |
1207 | int argc, const char **argv) | |
1208 | { | |
1209 | char buf[MAX_ARGSTR_LEN + 1]; | |
1210 | int i; | |
1211 | ||
1212 | if (tp->nr_args < argc) | |
1213 | return false; | |
1214 | ||
1215 | for (i = 0; i < argc; i++) { | |
1216 | snprintf(buf, sizeof(buf), "%s=%s", | |
1217 | tp->args[i].name, tp->args[i].comm); | |
1218 | if (strcmp(buf, argv[i])) | |
1219 | return false; | |
1220 | } | |
1221 | return true; | |
1222 | } | |
d262271d MH |
1223 | |
1224 | int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **)) | |
1225 | { | |
1226 | int argc = 0, ret = 0; | |
1227 | char **argv; | |
1228 | ||
1229 | argv = argv_split(GFP_KERNEL, raw_command, &argc); | |
1230 | if (!argv) | |
1231 | return -ENOMEM; | |
1232 | ||
1233 | if (argc) | |
1234 | ret = createfn(argc, (const char **)argv); | |
1235 | ||
1236 | argv_free(argv); | |
1237 | ||
1238 | return ret; | |
1239 | } |