Commit | Line | Data |
---|---|---|
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; | |
57421dbb JB |
14 | static DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls); |
15 | static DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls); | |
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; | |
e77405ad | 226 | struct ring_buffer *buffer; |
bed1ffca | 227 | int size; |
ee08c6ec FW |
228 | int syscall_nr; |
229 | ||
230 | syscall_nr = syscall_get_nr(current, regs); | |
cd0980fc HB |
231 | if (syscall_nr < 0) |
232 | return; | |
fb34a08c JB |
233 | if (!test_bit(syscall_nr, enabled_enter_syscalls)) |
234 | return; | |
ee08c6ec | 235 | |
bed1ffca FW |
236 | sys_data = syscall_nr_to_meta(syscall_nr); |
237 | if (!sys_data) | |
238 | return; | |
239 | ||
240 | size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args; | |
241 | ||
e77405ad SR |
242 | event = trace_current_buffer_lock_reserve(&buffer, sys_data->enter_id, |
243 | size, 0, 0); | |
bed1ffca FW |
244 | if (!event) |
245 | return; | |
246 | ||
247 | entry = ring_buffer_event_data(event); | |
248 | entry->nr = syscall_nr; | |
249 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args); | |
250 | ||
e77405ad SR |
251 | if (!filter_current_check_discard(buffer, sys_data->enter_event, |
252 | entry, event)) | |
253 | trace_current_buffer_unlock_commit(buffer, event, 0, 0); | |
ee08c6ec FW |
254 | } |
255 | ||
fb34a08c | 256 | void ftrace_syscall_exit(struct pt_regs *regs, long ret) |
ee08c6ec | 257 | { |
bed1ffca FW |
258 | struct syscall_trace_exit *entry; |
259 | struct syscall_metadata *sys_data; | |
260 | struct ring_buffer_event *event; | |
e77405ad | 261 | struct ring_buffer *buffer; |
ee08c6ec FW |
262 | int syscall_nr; |
263 | ||
264 | syscall_nr = syscall_get_nr(current, regs); | |
cd0980fc HB |
265 | if (syscall_nr < 0) |
266 | return; | |
fb34a08c JB |
267 | if (!test_bit(syscall_nr, enabled_exit_syscalls)) |
268 | return; | |
ee08c6ec | 269 | |
bed1ffca FW |
270 | sys_data = syscall_nr_to_meta(syscall_nr); |
271 | if (!sys_data) | |
272 | return; | |
273 | ||
e77405ad | 274 | event = trace_current_buffer_lock_reserve(&buffer, sys_data->exit_id, |
bed1ffca FW |
275 | sizeof(*entry), 0, 0); |
276 | if (!event) | |
277 | return; | |
278 | ||
279 | entry = ring_buffer_event_data(event); | |
280 | entry->nr = syscall_nr; | |
281 | entry->ret = syscall_get_return_value(current, regs); | |
282 | ||
e77405ad SR |
283 | if (!filter_current_check_discard(buffer, sys_data->exit_event, |
284 | entry, event)) | |
285 | trace_current_buffer_unlock_commit(buffer, event, 0, 0); | |
ee08c6ec FW |
286 | } |
287 | ||
fb34a08c | 288 | int reg_event_syscall_enter(void *ptr) |
ee08c6ec | 289 | { |
fb34a08c JB |
290 | int ret = 0; |
291 | int num; | |
292 | char *name; | |
293 | ||
294 | name = (char *)ptr; | |
295 | num = syscall_name_to_nr(name); | |
57421dbb | 296 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
297 | return -ENOSYS; |
298 | mutex_lock(&syscall_trace_lock); | |
299 | if (!sys_refcount_enter) | |
1c569f02 | 300 | ret = register_trace_sys_enter(ftrace_syscall_enter); |
fb34a08c JB |
301 | if (ret) { |
302 | pr_info("event trace: Could not activate" | |
303 | "syscall entry trace point"); | |
304 | } else { | |
305 | set_bit(num, enabled_enter_syscalls); | |
306 | sys_refcount_enter++; | |
307 | } | |
308 | mutex_unlock(&syscall_trace_lock); | |
309 | return ret; | |
ee08c6ec FW |
310 | } |
311 | ||
fb34a08c | 312 | void unreg_event_syscall_enter(void *ptr) |
ee08c6ec | 313 | { |
fb34a08c JB |
314 | int num; |
315 | char *name; | |
ee08c6ec | 316 | |
fb34a08c JB |
317 | name = (char *)ptr; |
318 | num = syscall_name_to_nr(name); | |
57421dbb | 319 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
320 | return; |
321 | mutex_lock(&syscall_trace_lock); | |
322 | sys_refcount_enter--; | |
323 | clear_bit(num, enabled_enter_syscalls); | |
324 | if (!sys_refcount_enter) | |
1c569f02 | 325 | unregister_trace_sys_enter(ftrace_syscall_enter); |
fb34a08c JB |
326 | mutex_unlock(&syscall_trace_lock); |
327 | } | |
ee08c6ec | 328 | |
fb34a08c | 329 | int reg_event_syscall_exit(void *ptr) |
ee08c6ec | 330 | { |
fb34a08c JB |
331 | int ret = 0; |
332 | int num; | |
333 | char *name; | |
334 | ||
335 | name = (char *)ptr; | |
336 | num = syscall_name_to_nr(name); | |
57421dbb | 337 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
338 | return -ENOSYS; |
339 | mutex_lock(&syscall_trace_lock); | |
340 | if (!sys_refcount_exit) | |
1c569f02 | 341 | ret = register_trace_sys_exit(ftrace_syscall_exit); |
fb34a08c JB |
342 | if (ret) { |
343 | pr_info("event trace: Could not activate" | |
344 | "syscall exit trace point"); | |
345 | } else { | |
346 | set_bit(num, enabled_exit_syscalls); | |
347 | sys_refcount_exit++; | |
ee08c6ec | 348 | } |
fb34a08c JB |
349 | mutex_unlock(&syscall_trace_lock); |
350 | return ret; | |
351 | } | |
ee08c6ec | 352 | |
fb34a08c JB |
353 | void unreg_event_syscall_exit(void *ptr) |
354 | { | |
355 | int num; | |
356 | char *name; | |
ee08c6ec | 357 | |
fb34a08c JB |
358 | name = (char *)ptr; |
359 | num = syscall_name_to_nr(name); | |
57421dbb | 360 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
361 | return; |
362 | mutex_lock(&syscall_trace_lock); | |
363 | sys_refcount_exit--; | |
364 | clear_bit(num, enabled_exit_syscalls); | |
365 | if (!sys_refcount_exit) | |
1c569f02 | 366 | unregister_trace_sys_exit(ftrace_syscall_exit); |
fb34a08c | 367 | mutex_unlock(&syscall_trace_lock); |
ee08c6ec | 368 | } |
fb34a08c JB |
369 | |
370 | struct trace_event event_syscall_enter = { | |
371 | .trace = print_syscall_enter, | |
fb34a08c JB |
372 | }; |
373 | ||
374 | struct trace_event event_syscall_exit = { | |
375 | .trace = print_syscall_exit, | |
fb34a08c | 376 | }; |
f4b5ffcc JB |
377 | |
378 | #ifdef CONFIG_EVENT_PROFILE | |
19007a67 | 379 | |
57421dbb JB |
380 | static DECLARE_BITMAP(enabled_prof_enter_syscalls, NR_syscalls); |
381 | static DECLARE_BITMAP(enabled_prof_exit_syscalls, NR_syscalls); | |
f4b5ffcc JB |
382 | static int sys_prof_refcount_enter; |
383 | static int sys_prof_refcount_exit; | |
384 | ||
385 | static void prof_syscall_enter(struct pt_regs *regs, long id) | |
386 | { | |
e6971969 | 387 | struct syscall_trace_enter *rec; |
f4b5ffcc JB |
388 | struct syscall_metadata *sys_data; |
389 | int syscall_nr; | |
19007a67 | 390 | int size; |
f4b5ffcc JB |
391 | |
392 | syscall_nr = syscall_get_nr(current, regs); | |
393 | if (!test_bit(syscall_nr, enabled_prof_enter_syscalls)) | |
394 | return; | |
395 | ||
396 | sys_data = syscall_nr_to_meta(syscall_nr); | |
397 | if (!sys_data) | |
398 | return; | |
399 | ||
19007a67 FW |
400 | /* get the size after alignment with the u32 buffer size field */ |
401 | size = sizeof(unsigned long) * sys_data->nb_args + sizeof(*rec); | |
402 | size = ALIGN(size + sizeof(u32), sizeof(u64)); | |
403 | size -= sizeof(u32); | |
404 | ||
405 | do { | |
406 | char raw_data[size]; | |
407 | ||
408 | /* zero the dead bytes from align to not leak stack to user */ | |
409 | *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; | |
410 | ||
e6971969 LZ |
411 | rec = (struct syscall_trace_enter *) raw_data; |
412 | tracing_generic_entry_update(&rec->ent, 0, 0); | |
413 | rec->ent.type = sys_data->enter_id; | |
414 | rec->nr = syscall_nr; | |
19007a67 FW |
415 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, |
416 | (unsigned long *)&rec->args); | |
417 | perf_tpcounter_event(sys_data->enter_id, 0, 1, rec, size); | |
418 | } while(0); | |
f4b5ffcc JB |
419 | } |
420 | ||
421 | int reg_prof_syscall_enter(char *name) | |
422 | { | |
423 | int ret = 0; | |
424 | int num; | |
425 | ||
426 | num = syscall_name_to_nr(name); | |
57421dbb | 427 | if (num < 0 || num >= NR_syscalls) |
f4b5ffcc JB |
428 | return -ENOSYS; |
429 | ||
430 | mutex_lock(&syscall_trace_lock); | |
431 | if (!sys_prof_refcount_enter) | |
1c569f02 | 432 | ret = register_trace_sys_enter(prof_syscall_enter); |
f4b5ffcc JB |
433 | if (ret) { |
434 | pr_info("event trace: Could not activate" | |
435 | "syscall entry trace point"); | |
436 | } else { | |
437 | set_bit(num, enabled_prof_enter_syscalls); | |
438 | sys_prof_refcount_enter++; | |
439 | } | |
440 | mutex_unlock(&syscall_trace_lock); | |
441 | return ret; | |
442 | } | |
443 | ||
444 | void unreg_prof_syscall_enter(char *name) | |
445 | { | |
446 | int num; | |
447 | ||
448 | num = syscall_name_to_nr(name); | |
57421dbb | 449 | if (num < 0 || num >= NR_syscalls) |
f4b5ffcc JB |
450 | return; |
451 | ||
452 | mutex_lock(&syscall_trace_lock); | |
453 | sys_prof_refcount_enter--; | |
454 | clear_bit(num, enabled_prof_enter_syscalls); | |
455 | if (!sys_prof_refcount_enter) | |
1c569f02 | 456 | unregister_trace_sys_enter(prof_syscall_enter); |
f4b5ffcc JB |
457 | mutex_unlock(&syscall_trace_lock); |
458 | } | |
459 | ||
460 | static void prof_syscall_exit(struct pt_regs *regs, long ret) | |
461 | { | |
462 | struct syscall_metadata *sys_data; | |
e6971969 | 463 | struct syscall_trace_exit rec; |
f4b5ffcc JB |
464 | int syscall_nr; |
465 | ||
466 | syscall_nr = syscall_get_nr(current, regs); | |
467 | if (!test_bit(syscall_nr, enabled_prof_exit_syscalls)) | |
468 | return; | |
469 | ||
470 | sys_data = syscall_nr_to_meta(syscall_nr); | |
471 | if (!sys_data) | |
472 | return; | |
473 | ||
e6971969 LZ |
474 | tracing_generic_entry_update(&rec.ent, 0, 0); |
475 | rec.ent.type = sys_data->exit_id; | |
476 | rec.nr = syscall_nr; | |
19007a67 FW |
477 | rec.ret = syscall_get_return_value(current, regs); |
478 | ||
479 | perf_tpcounter_event(sys_data->exit_id, 0, 1, &rec, sizeof(rec)); | |
f4b5ffcc JB |
480 | } |
481 | ||
482 | int reg_prof_syscall_exit(char *name) | |
483 | { | |
484 | int ret = 0; | |
485 | int num; | |
486 | ||
487 | num = syscall_name_to_nr(name); | |
57421dbb | 488 | if (num < 0 || num >= NR_syscalls) |
f4b5ffcc JB |
489 | return -ENOSYS; |
490 | ||
491 | mutex_lock(&syscall_trace_lock); | |
492 | if (!sys_prof_refcount_exit) | |
1c569f02 | 493 | ret = register_trace_sys_exit(prof_syscall_exit); |
f4b5ffcc JB |
494 | if (ret) { |
495 | pr_info("event trace: Could not activate" | |
496 | "syscall entry trace point"); | |
497 | } else { | |
498 | set_bit(num, enabled_prof_exit_syscalls); | |
499 | sys_prof_refcount_exit++; | |
500 | } | |
501 | mutex_unlock(&syscall_trace_lock); | |
502 | return ret; | |
503 | } | |
504 | ||
505 | void unreg_prof_syscall_exit(char *name) | |
506 | { | |
507 | int num; | |
508 | ||
509 | num = syscall_name_to_nr(name); | |
57421dbb | 510 | if (num < 0 || num >= NR_syscalls) |
f4b5ffcc JB |
511 | return; |
512 | ||
513 | mutex_lock(&syscall_trace_lock); | |
514 | sys_prof_refcount_exit--; | |
515 | clear_bit(num, enabled_prof_exit_syscalls); | |
516 | if (!sys_prof_refcount_exit) | |
1c569f02 | 517 | unregister_trace_sys_exit(prof_syscall_exit); |
f4b5ffcc JB |
518 | mutex_unlock(&syscall_trace_lock); |
519 | } | |
520 | ||
521 | #endif | |
522 | ||
523 |