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Commit | Line | Data |
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47788c58 | 1 | #include <trace/syscall.h> |
1c569f02 | 2 | #include <trace/events/syscalls.h> |
ee08c6ec | 3 | #include <linux/kernel.h> |
fb34a08c | 4 | #include <linux/ftrace.h> |
f4b5ffcc | 5 | #include <linux/perf_counter.h> |
ee08c6ec FW |
6 | #include <asm/syscall.h> |
7 | ||
8 | #include "trace_output.h" | |
9 | #include "trace.h" | |
10 | ||
5be71b61 | 11 | static DEFINE_MUTEX(syscall_trace_lock); |
fb34a08c JB |
12 | static int sys_refcount_enter; |
13 | static int sys_refcount_exit; | |
14 | static DECLARE_BITMAP(enabled_enter_syscalls, FTRACE_SYSCALL_MAX); | |
15 | static DECLARE_BITMAP(enabled_exit_syscalls, FTRACE_SYSCALL_MAX); | |
ee08c6ec | 16 | |
bed1ffca FW |
17 | enum print_line_t |
18 | print_syscall_enter(struct trace_iterator *iter, int flags) | |
19 | { | |
20 | struct trace_seq *s = &iter->seq; | |
21 | struct trace_entry *ent = iter->ent; | |
22 | struct syscall_trace_enter *trace; | |
23 | struct syscall_metadata *entry; | |
24 | int i, ret, syscall; | |
25 | ||
64c12e04 | 26 | trace = (typeof(trace))ent; |
bed1ffca | 27 | syscall = trace->nr; |
bed1ffca | 28 | entry = syscall_nr_to_meta(syscall); |
64c12e04 | 29 | |
bed1ffca FW |
30 | if (!entry) |
31 | goto end; | |
32 | ||
64c12e04 JB |
33 | if (entry->enter_id != ent->type) { |
34 | WARN_ON_ONCE(1); | |
35 | goto end; | |
36 | } | |
37 | ||
bed1ffca FW |
38 | ret = trace_seq_printf(s, "%s(", entry->name); |
39 | if (!ret) | |
40 | return TRACE_TYPE_PARTIAL_LINE; | |
41 | ||
42 | for (i = 0; i < entry->nb_args; i++) { | |
43 | /* parameter types */ | |
ba8b3a40 | 44 | if (trace_flags & TRACE_ITER_VERBOSE) { |
bed1ffca FW |
45 | ret = trace_seq_printf(s, "%s ", entry->types[i]); |
46 | if (!ret) | |
47 | return TRACE_TYPE_PARTIAL_LINE; | |
48 | } | |
49 | /* parameter values */ | |
4539f077 | 50 | ret = trace_seq_printf(s, "%s: %lx%s", entry->args[i], |
bed1ffca | 51 | trace->args[i], |
4539f077 | 52 | i == entry->nb_args - 1 ? "" : ", "); |
bed1ffca FW |
53 | if (!ret) |
54 | return TRACE_TYPE_PARTIAL_LINE; | |
55 | } | |
56 | ||
4539f077 LZ |
57 | ret = trace_seq_putc(s, ')'); |
58 | if (!ret) | |
59 | return TRACE_TYPE_PARTIAL_LINE; | |
60 | ||
bed1ffca | 61 | end: |
4539f077 LZ |
62 | ret = trace_seq_putc(s, '\n'); |
63 | if (!ret) | |
64 | return TRACE_TYPE_PARTIAL_LINE; | |
65 | ||
bed1ffca FW |
66 | return TRACE_TYPE_HANDLED; |
67 | } | |
68 | ||
69 | enum print_line_t | |
70 | print_syscall_exit(struct trace_iterator *iter, int flags) | |
71 | { | |
72 | struct trace_seq *s = &iter->seq; | |
73 | struct trace_entry *ent = iter->ent; | |
74 | struct syscall_trace_exit *trace; | |
75 | int syscall; | |
76 | struct syscall_metadata *entry; | |
77 | int ret; | |
78 | ||
64c12e04 | 79 | trace = (typeof(trace))ent; |
bed1ffca | 80 | syscall = trace->nr; |
bed1ffca | 81 | entry = syscall_nr_to_meta(syscall); |
64c12e04 | 82 | |
bed1ffca FW |
83 | if (!entry) { |
84 | trace_seq_printf(s, "\n"); | |
85 | return TRACE_TYPE_HANDLED; | |
86 | } | |
87 | ||
64c12e04 JB |
88 | if (entry->exit_id != ent->type) { |
89 | WARN_ON_ONCE(1); | |
90 | return TRACE_TYPE_UNHANDLED; | |
91 | } | |
92 | ||
bed1ffca FW |
93 | ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name, |
94 | trace->ret); | |
95 | if (!ret) | |
96 | return TRACE_TYPE_PARTIAL_LINE; | |
97 | ||
98 | return TRACE_TYPE_HANDLED; | |
99 | } | |
100 | ||
e6971969 LZ |
101 | extern char *__bad_type_size(void); |
102 | ||
103 | #define SYSCALL_FIELD(type, name) \ | |
104 | sizeof(type) != sizeof(trace.name) ? \ | |
105 | __bad_type_size() : \ | |
106 | #type, #name, offsetof(typeof(trace), name), sizeof(trace.name) | |
107 | ||
10a5b66f | 108 | int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s) |
dc4ddb4c FW |
109 | { |
110 | int i; | |
111 | int nr; | |
e6971969 | 112 | int ret; |
dc4ddb4c | 113 | struct syscall_metadata *entry; |
e6971969 LZ |
114 | struct syscall_trace_enter trace; |
115 | int offset = offsetof(struct syscall_trace_enter, args); | |
dc4ddb4c | 116 | |
e6971969 | 117 | nr = syscall_name_to_nr(call->data); |
dc4ddb4c FW |
118 | entry = syscall_nr_to_meta(nr); |
119 | ||
120 | if (!entry) | |
e6971969 LZ |
121 | return 0; |
122 | ||
123 | ret = trace_seq_printf(s, "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n", | |
124 | SYSCALL_FIELD(int, nr)); | |
125 | if (!ret) | |
126 | return 0; | |
dc4ddb4c FW |
127 | |
128 | for (i = 0; i < entry->nb_args; i++) { | |
129 | ret = trace_seq_printf(s, "\tfield:%s %s;", entry->types[i], | |
130 | entry->args[i]); | |
131 | if (!ret) | |
132 | return 0; | |
e6971969 | 133 | ret = trace_seq_printf(s, "\toffset:%d;\tsize:%zu;\n", offset, |
dc4ddb4c FW |
134 | sizeof(unsigned long)); |
135 | if (!ret) | |
136 | return 0; | |
137 | offset += sizeof(unsigned long); | |
138 | } | |
139 | ||
4539f077 | 140 | trace_seq_puts(s, "\nprint fmt: \""); |
dc4ddb4c | 141 | for (i = 0; i < entry->nb_args; i++) { |
e6971969 | 142 | ret = trace_seq_printf(s, "%s: 0x%%0%zulx%s", entry->args[i], |
dc4ddb4c | 143 | sizeof(unsigned long), |
4539f077 | 144 | i == entry->nb_args - 1 ? "" : ", "); |
dc4ddb4c FW |
145 | if (!ret) |
146 | return 0; | |
147 | } | |
4539f077 | 148 | trace_seq_putc(s, '"'); |
dc4ddb4c FW |
149 | |
150 | for (i = 0; i < entry->nb_args; i++) { | |
4539f077 LZ |
151 | ret = trace_seq_printf(s, ", ((unsigned long)(REC->%s))", |
152 | entry->args[i]); | |
dc4ddb4c FW |
153 | if (!ret) |
154 | return 0; | |
155 | } | |
156 | ||
4539f077 | 157 | return trace_seq_putc(s, '\n'); |
dc4ddb4c FW |
158 | } |
159 | ||
10a5b66f LZ |
160 | int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s) |
161 | { | |
162 | int ret; | |
163 | struct syscall_trace_exit trace; | |
164 | ||
165 | ret = trace_seq_printf(s, | |
166 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
167 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n", | |
168 | SYSCALL_FIELD(int, nr), | |
169 | SYSCALL_FIELD(unsigned long, ret)); | |
170 | if (!ret) | |
171 | return 0; | |
172 | ||
173 | return trace_seq_printf(s, "\nprint fmt: \"0x%%lx\", REC->ret\n"); | |
174 | } | |
175 | ||
540b7b8d LZ |
176 | int syscall_enter_define_fields(struct ftrace_event_call *call) |
177 | { | |
178 | struct syscall_trace_enter trace; | |
179 | struct syscall_metadata *meta; | |
180 | int ret; | |
181 | int nr; | |
182 | int i; | |
183 | int offset = offsetof(typeof(trace), args); | |
184 | ||
185 | nr = syscall_name_to_nr(call->data); | |
186 | meta = syscall_nr_to_meta(nr); | |
187 | ||
188 | if (!meta) | |
189 | return 0; | |
190 | ||
191 | ret = trace_define_common_fields(call); | |
192 | if (ret) | |
193 | return ret; | |
194 | ||
195 | for (i = 0; i < meta->nb_args; i++) { | |
196 | ret = trace_define_field(call, meta->types[i], | |
197 | meta->args[i], offset, | |
43b51ead LZ |
198 | sizeof(unsigned long), 0, |
199 | FILTER_OTHER); | |
540b7b8d LZ |
200 | offset += sizeof(unsigned long); |
201 | } | |
202 | ||
203 | return ret; | |
204 | } | |
205 | ||
206 | int syscall_exit_define_fields(struct ftrace_event_call *call) | |
207 | { | |
208 | struct syscall_trace_exit trace; | |
209 | int ret; | |
210 | ||
211 | ret = trace_define_common_fields(call); | |
212 | if (ret) | |
213 | return ret; | |
214 | ||
43b51ead LZ |
215 | ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0, |
216 | FILTER_OTHER); | |
540b7b8d LZ |
217 | |
218 | return ret; | |
219 | } | |
220 | ||
fb34a08c | 221 | void ftrace_syscall_enter(struct pt_regs *regs, long id) |
ee08c6ec | 222 | { |
bed1ffca FW |
223 | struct syscall_trace_enter *entry; |
224 | struct syscall_metadata *sys_data; | |
225 | struct ring_buffer_event *event; | |
226 | int size; | |
ee08c6ec FW |
227 | int syscall_nr; |
228 | ||
229 | syscall_nr = syscall_get_nr(current, regs); | |
fb34a08c JB |
230 | if (!test_bit(syscall_nr, enabled_enter_syscalls)) |
231 | return; | |
ee08c6ec | 232 | |
bed1ffca FW |
233 | sys_data = syscall_nr_to_meta(syscall_nr); |
234 | if (!sys_data) | |
235 | return; | |
236 | ||
237 | size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args; | |
238 | ||
64c12e04 | 239 | event = trace_current_buffer_lock_reserve(sys_data->enter_id, size, |
bed1ffca FW |
240 | 0, 0); |
241 | if (!event) | |
242 | return; | |
243 | ||
244 | entry = ring_buffer_event_data(event); | |
245 | entry->nr = syscall_nr; | |
246 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args); | |
247 | ||
540b7b8d LZ |
248 | if (!filter_current_check_discard(sys_data->enter_event, entry, event)) |
249 | trace_current_buffer_unlock_commit(event, 0, 0); | |
ee08c6ec FW |
250 | } |
251 | ||
fb34a08c | 252 | void ftrace_syscall_exit(struct pt_regs *regs, long ret) |
ee08c6ec | 253 | { |
bed1ffca FW |
254 | struct syscall_trace_exit *entry; |
255 | struct syscall_metadata *sys_data; | |
256 | struct ring_buffer_event *event; | |
ee08c6ec FW |
257 | int syscall_nr; |
258 | ||
259 | syscall_nr = syscall_get_nr(current, regs); | |
fb34a08c JB |
260 | if (!test_bit(syscall_nr, enabled_exit_syscalls)) |
261 | return; | |
ee08c6ec | 262 | |
bed1ffca FW |
263 | sys_data = syscall_nr_to_meta(syscall_nr); |
264 | if (!sys_data) | |
265 | return; | |
266 | ||
64c12e04 | 267 | event = trace_current_buffer_lock_reserve(sys_data->exit_id, |
bed1ffca FW |
268 | sizeof(*entry), 0, 0); |
269 | if (!event) | |
270 | return; | |
271 | ||
272 | entry = ring_buffer_event_data(event); | |
273 | entry->nr = syscall_nr; | |
274 | entry->ret = syscall_get_return_value(current, regs); | |
275 | ||
540b7b8d LZ |
276 | if (!filter_current_check_discard(sys_data->exit_event, entry, event)) |
277 | trace_current_buffer_unlock_commit(event, 0, 0); | |
ee08c6ec FW |
278 | } |
279 | ||
fb34a08c | 280 | int reg_event_syscall_enter(void *ptr) |
ee08c6ec | 281 | { |
fb34a08c JB |
282 | int ret = 0; |
283 | int num; | |
284 | char *name; | |
285 | ||
286 | name = (char *)ptr; | |
287 | num = syscall_name_to_nr(name); | |
288 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
289 | return -ENOSYS; | |
290 | mutex_lock(&syscall_trace_lock); | |
291 | if (!sys_refcount_enter) | |
1c569f02 | 292 | ret = register_trace_sys_enter(ftrace_syscall_enter); |
fb34a08c JB |
293 | if (ret) { |
294 | pr_info("event trace: Could not activate" | |
295 | "syscall entry trace point"); | |
296 | } else { | |
297 | set_bit(num, enabled_enter_syscalls); | |
298 | sys_refcount_enter++; | |
299 | } | |
300 | mutex_unlock(&syscall_trace_lock); | |
301 | return ret; | |
ee08c6ec FW |
302 | } |
303 | ||
fb34a08c | 304 | void unreg_event_syscall_enter(void *ptr) |
ee08c6ec | 305 | { |
fb34a08c JB |
306 | int num; |
307 | char *name; | |
ee08c6ec | 308 | |
fb34a08c JB |
309 | name = (char *)ptr; |
310 | num = syscall_name_to_nr(name); | |
311 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
312 | return; | |
313 | mutex_lock(&syscall_trace_lock); | |
314 | sys_refcount_enter--; | |
315 | clear_bit(num, enabled_enter_syscalls); | |
316 | if (!sys_refcount_enter) | |
1c569f02 | 317 | unregister_trace_sys_enter(ftrace_syscall_enter); |
fb34a08c JB |
318 | mutex_unlock(&syscall_trace_lock); |
319 | } | |
ee08c6ec | 320 | |
fb34a08c | 321 | int reg_event_syscall_exit(void *ptr) |
ee08c6ec | 322 | { |
fb34a08c JB |
323 | int ret = 0; |
324 | int num; | |
325 | char *name; | |
326 | ||
327 | name = (char *)ptr; | |
328 | num = syscall_name_to_nr(name); | |
329 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
330 | return -ENOSYS; | |
331 | mutex_lock(&syscall_trace_lock); | |
332 | if (!sys_refcount_exit) | |
1c569f02 | 333 | ret = register_trace_sys_exit(ftrace_syscall_exit); |
fb34a08c JB |
334 | if (ret) { |
335 | pr_info("event trace: Could not activate" | |
336 | "syscall exit trace point"); | |
337 | } else { | |
338 | set_bit(num, enabled_exit_syscalls); | |
339 | sys_refcount_exit++; | |
ee08c6ec | 340 | } |
fb34a08c JB |
341 | mutex_unlock(&syscall_trace_lock); |
342 | return ret; | |
343 | } | |
ee08c6ec | 344 | |
fb34a08c JB |
345 | void unreg_event_syscall_exit(void *ptr) |
346 | { | |
347 | int num; | |
348 | char *name; | |
ee08c6ec | 349 | |
fb34a08c JB |
350 | name = (char *)ptr; |
351 | num = syscall_name_to_nr(name); | |
352 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
353 | return; | |
354 | mutex_lock(&syscall_trace_lock); | |
355 | sys_refcount_exit--; | |
356 | clear_bit(num, enabled_exit_syscalls); | |
357 | if (!sys_refcount_exit) | |
1c569f02 | 358 | unregister_trace_sys_exit(ftrace_syscall_exit); |
fb34a08c | 359 | mutex_unlock(&syscall_trace_lock); |
ee08c6ec | 360 | } |
fb34a08c JB |
361 | |
362 | struct trace_event event_syscall_enter = { | |
363 | .trace = print_syscall_enter, | |
fb34a08c JB |
364 | }; |
365 | ||
366 | struct trace_event event_syscall_exit = { | |
367 | .trace = print_syscall_exit, | |
fb34a08c | 368 | }; |
f4b5ffcc JB |
369 | |
370 | #ifdef CONFIG_EVENT_PROFILE | |
19007a67 | 371 | |
f4b5ffcc JB |
372 | static DECLARE_BITMAP(enabled_prof_enter_syscalls, FTRACE_SYSCALL_MAX); |
373 | static DECLARE_BITMAP(enabled_prof_exit_syscalls, FTRACE_SYSCALL_MAX); | |
374 | static int sys_prof_refcount_enter; | |
375 | static int sys_prof_refcount_exit; | |
376 | ||
377 | static void prof_syscall_enter(struct pt_regs *regs, long id) | |
378 | { | |
e6971969 | 379 | struct syscall_trace_enter *rec; |
f4b5ffcc JB |
380 | struct syscall_metadata *sys_data; |
381 | int syscall_nr; | |
19007a67 | 382 | int size; |
f4b5ffcc JB |
383 | |
384 | syscall_nr = syscall_get_nr(current, regs); | |
385 | if (!test_bit(syscall_nr, enabled_prof_enter_syscalls)) | |
386 | return; | |
387 | ||
388 | sys_data = syscall_nr_to_meta(syscall_nr); | |
389 | if (!sys_data) | |
390 | return; | |
391 | ||
19007a67 FW |
392 | /* get the size after alignment with the u32 buffer size field */ |
393 | size = sizeof(unsigned long) * sys_data->nb_args + sizeof(*rec); | |
394 | size = ALIGN(size + sizeof(u32), sizeof(u64)); | |
395 | size -= sizeof(u32); | |
396 | ||
397 | do { | |
398 | char raw_data[size]; | |
399 | ||
400 | /* zero the dead bytes from align to not leak stack to user */ | |
401 | *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; | |
402 | ||
e6971969 LZ |
403 | rec = (struct syscall_trace_enter *) raw_data; |
404 | tracing_generic_entry_update(&rec->ent, 0, 0); | |
405 | rec->ent.type = sys_data->enter_id; | |
406 | rec->nr = syscall_nr; | |
19007a67 FW |
407 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, |
408 | (unsigned long *)&rec->args); | |
409 | perf_tpcounter_event(sys_data->enter_id, 0, 1, rec, size); | |
410 | } while(0); | |
f4b5ffcc JB |
411 | } |
412 | ||
413 | int reg_prof_syscall_enter(char *name) | |
414 | { | |
415 | int ret = 0; | |
416 | int num; | |
417 | ||
418 | num = syscall_name_to_nr(name); | |
419 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
420 | return -ENOSYS; | |
421 | ||
422 | mutex_lock(&syscall_trace_lock); | |
423 | if (!sys_prof_refcount_enter) | |
1c569f02 | 424 | ret = register_trace_sys_enter(prof_syscall_enter); |
f4b5ffcc JB |
425 | if (ret) { |
426 | pr_info("event trace: Could not activate" | |
427 | "syscall entry trace point"); | |
428 | } else { | |
429 | set_bit(num, enabled_prof_enter_syscalls); | |
430 | sys_prof_refcount_enter++; | |
431 | } | |
432 | mutex_unlock(&syscall_trace_lock); | |
433 | return ret; | |
434 | } | |
435 | ||
436 | void unreg_prof_syscall_enter(char *name) | |
437 | { | |
438 | int num; | |
439 | ||
440 | num = syscall_name_to_nr(name); | |
441 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
442 | return; | |
443 | ||
444 | mutex_lock(&syscall_trace_lock); | |
445 | sys_prof_refcount_enter--; | |
446 | clear_bit(num, enabled_prof_enter_syscalls); | |
447 | if (!sys_prof_refcount_enter) | |
1c569f02 | 448 | unregister_trace_sys_enter(prof_syscall_enter); |
f4b5ffcc JB |
449 | mutex_unlock(&syscall_trace_lock); |
450 | } | |
451 | ||
452 | static void prof_syscall_exit(struct pt_regs *regs, long ret) | |
453 | { | |
454 | struct syscall_metadata *sys_data; | |
e6971969 | 455 | struct syscall_trace_exit rec; |
f4b5ffcc JB |
456 | int syscall_nr; |
457 | ||
458 | syscall_nr = syscall_get_nr(current, regs); | |
459 | if (!test_bit(syscall_nr, enabled_prof_exit_syscalls)) | |
460 | return; | |
461 | ||
462 | sys_data = syscall_nr_to_meta(syscall_nr); | |
463 | if (!sys_data) | |
464 | return; | |
465 | ||
e6971969 LZ |
466 | tracing_generic_entry_update(&rec.ent, 0, 0); |
467 | rec.ent.type = sys_data->exit_id; | |
468 | rec.nr = syscall_nr; | |
19007a67 FW |
469 | rec.ret = syscall_get_return_value(current, regs); |
470 | ||
471 | perf_tpcounter_event(sys_data->exit_id, 0, 1, &rec, sizeof(rec)); | |
f4b5ffcc JB |
472 | } |
473 | ||
474 | int reg_prof_syscall_exit(char *name) | |
475 | { | |
476 | int ret = 0; | |
477 | int num; | |
478 | ||
479 | num = syscall_name_to_nr(name); | |
480 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
481 | return -ENOSYS; | |
482 | ||
483 | mutex_lock(&syscall_trace_lock); | |
484 | if (!sys_prof_refcount_exit) | |
1c569f02 | 485 | ret = register_trace_sys_exit(prof_syscall_exit); |
f4b5ffcc JB |
486 | if (ret) { |
487 | pr_info("event trace: Could not activate" | |
488 | "syscall entry trace point"); | |
489 | } else { | |
490 | set_bit(num, enabled_prof_exit_syscalls); | |
491 | sys_prof_refcount_exit++; | |
492 | } | |
493 | mutex_unlock(&syscall_trace_lock); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | void unreg_prof_syscall_exit(char *name) | |
498 | { | |
499 | int num; | |
500 | ||
501 | num = syscall_name_to_nr(name); | |
502 | if (num < 0 || num >= FTRACE_SYSCALL_MAX) | |
503 | return; | |
504 | ||
505 | mutex_lock(&syscall_trace_lock); | |
506 | sys_prof_refcount_exit--; | |
507 | clear_bit(num, enabled_prof_exit_syscalls); | |
508 | if (!sys_prof_refcount_exit) | |
1c569f02 | 509 | unregister_trace_sys_exit(prof_syscall_exit); |
f4b5ffcc JB |
510 | mutex_unlock(&syscall_trace_lock); |
511 | } | |
512 | ||
513 | #endif | |
514 | ||
515 |