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Commit | Line | Data |
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47788c58 | 1 | #include <trace/syscall.h> |
1c569f02 | 2 | #include <trace/events/syscalls.h> |
5a0e3ad6 | 3 | #include <linux/slab.h> |
ee08c6ec | 4 | #include <linux/kernel.h> |
fb34a08c | 5 | #include <linux/ftrace.h> |
cdd6c482 | 6 | #include <linux/perf_event.h> |
ee08c6ec FW |
7 | #include <asm/syscall.h> |
8 | ||
9 | #include "trace_output.h" | |
10 | #include "trace.h" | |
11 | ||
5be71b61 | 12 | static DEFINE_MUTEX(syscall_trace_lock); |
fb34a08c JB |
13 | static int sys_refcount_enter; |
14 | static int sys_refcount_exit; | |
57421dbb JB |
15 | static DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls); |
16 | static DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls); | |
ee08c6ec | 17 | |
2239291a SR |
18 | static int syscall_enter_register(struct ftrace_event_call *event, |
19 | enum trace_reg type); | |
20 | static int syscall_exit_register(struct ftrace_event_call *event, | |
21 | enum trace_reg type); | |
22 | ||
2e33af02 SR |
23 | static int syscall_enter_define_fields(struct ftrace_event_call *call); |
24 | static int syscall_exit_define_fields(struct ftrace_event_call *call); | |
25 | ||
26 | static struct list_head * | |
27 | syscall_get_enter_fields(struct ftrace_event_call *call) | |
28 | { | |
29 | struct syscall_metadata *entry = call->data; | |
30 | ||
31 | return &entry->enter_fields; | |
32 | } | |
33 | ||
80decc70 | 34 | struct trace_event_functions enter_syscall_print_funcs = { |
7f85803a | 35 | .trace = print_syscall_enter, |
80decc70 SR |
36 | }; |
37 | ||
38 | struct trace_event_functions exit_syscall_print_funcs = { | |
7f85803a | 39 | .trace = print_syscall_exit, |
80decc70 SR |
40 | }; |
41 | ||
2239291a | 42 | struct ftrace_event_class event_class_syscall_enter = { |
7f85803a LJ |
43 | .system = "syscalls", |
44 | .reg = syscall_enter_register, | |
45 | .define_fields = syscall_enter_define_fields, | |
46 | .get_fields = syscall_get_enter_fields, | |
47 | .raw_init = init_syscall_trace, | |
2239291a SR |
48 | }; |
49 | ||
50 | struct ftrace_event_class event_class_syscall_exit = { | |
7f85803a LJ |
51 | .system = "syscalls", |
52 | .reg = syscall_exit_register, | |
53 | .define_fields = syscall_exit_define_fields, | |
54 | .fields = LIST_HEAD_INIT(event_class_syscall_exit.fields), | |
55 | .raw_init = init_syscall_trace, | |
8f082018 SR |
56 | }; |
57 | ||
3d56e331 SR |
58 | extern struct syscall_metadata *__start_syscalls_metadata[]; |
59 | extern struct syscall_metadata *__stop_syscalls_metadata[]; | |
c44fc770 FW |
60 | |
61 | static struct syscall_metadata **syscalls_metadata; | |
62 | ||
3d56e331 SR |
63 | static __init struct syscall_metadata * |
64 | find_syscall_meta(unsigned long syscall) | |
c44fc770 | 65 | { |
3d56e331 SR |
66 | struct syscall_metadata **start; |
67 | struct syscall_metadata **stop; | |
c44fc770 FW |
68 | char str[KSYM_SYMBOL_LEN]; |
69 | ||
70 | ||
3d56e331 SR |
71 | start = __start_syscalls_metadata; |
72 | stop = __stop_syscalls_metadata; | |
c44fc770 FW |
73 | kallsyms_lookup(syscall, NULL, NULL, NULL, str); |
74 | ||
75 | for ( ; start < stop; start++) { | |
76 | /* | |
77 | * Only compare after the "sys" prefix. Archs that use | |
78 | * syscall wrappers may have syscalls symbols aliases prefixed | |
79 | * with "SyS" instead of "sys", leading to an unwanted | |
80 | * mismatch. | |
81 | */ | |
3d56e331 SR |
82 | if ((*start)->name && !strcmp((*start)->name + 3, str + 3)) |
83 | return *start; | |
c44fc770 FW |
84 | } |
85 | return NULL; | |
86 | } | |
87 | ||
88 | static struct syscall_metadata *syscall_nr_to_meta(int nr) | |
89 | { | |
90 | if (!syscalls_metadata || nr >= NR_syscalls || nr < 0) | |
91 | return NULL; | |
92 | ||
93 | return syscalls_metadata[nr]; | |
94 | } | |
95 | ||
bed1ffca | 96 | enum print_line_t |
a9a57763 SR |
97 | print_syscall_enter(struct trace_iterator *iter, int flags, |
98 | struct trace_event *event) | |
bed1ffca FW |
99 | { |
100 | struct trace_seq *s = &iter->seq; | |
101 | struct trace_entry *ent = iter->ent; | |
102 | struct syscall_trace_enter *trace; | |
103 | struct syscall_metadata *entry; | |
104 | int i, ret, syscall; | |
105 | ||
64c12e04 | 106 | trace = (typeof(trace))ent; |
bed1ffca | 107 | syscall = trace->nr; |
bed1ffca | 108 | entry = syscall_nr_to_meta(syscall); |
64c12e04 | 109 | |
bed1ffca FW |
110 | if (!entry) |
111 | goto end; | |
112 | ||
32c0edae | 113 | if (entry->enter_event->event.type != ent->type) { |
64c12e04 JB |
114 | WARN_ON_ONCE(1); |
115 | goto end; | |
116 | } | |
117 | ||
bed1ffca FW |
118 | ret = trace_seq_printf(s, "%s(", entry->name); |
119 | if (!ret) | |
120 | return TRACE_TYPE_PARTIAL_LINE; | |
121 | ||
122 | for (i = 0; i < entry->nb_args; i++) { | |
123 | /* parameter types */ | |
ba8b3a40 | 124 | if (trace_flags & TRACE_ITER_VERBOSE) { |
bed1ffca FW |
125 | ret = trace_seq_printf(s, "%s ", entry->types[i]); |
126 | if (!ret) | |
127 | return TRACE_TYPE_PARTIAL_LINE; | |
128 | } | |
129 | /* parameter values */ | |
4539f077 | 130 | ret = trace_seq_printf(s, "%s: %lx%s", entry->args[i], |
bed1ffca | 131 | trace->args[i], |
4539f077 | 132 | i == entry->nb_args - 1 ? "" : ", "); |
bed1ffca FW |
133 | if (!ret) |
134 | return TRACE_TYPE_PARTIAL_LINE; | |
135 | } | |
136 | ||
4539f077 LZ |
137 | ret = trace_seq_putc(s, ')'); |
138 | if (!ret) | |
139 | return TRACE_TYPE_PARTIAL_LINE; | |
140 | ||
bed1ffca | 141 | end: |
4539f077 LZ |
142 | ret = trace_seq_putc(s, '\n'); |
143 | if (!ret) | |
144 | return TRACE_TYPE_PARTIAL_LINE; | |
145 | ||
bed1ffca FW |
146 | return TRACE_TYPE_HANDLED; |
147 | } | |
148 | ||
149 | enum print_line_t | |
a9a57763 SR |
150 | print_syscall_exit(struct trace_iterator *iter, int flags, |
151 | struct trace_event *event) | |
bed1ffca FW |
152 | { |
153 | struct trace_seq *s = &iter->seq; | |
154 | struct trace_entry *ent = iter->ent; | |
155 | struct syscall_trace_exit *trace; | |
156 | int syscall; | |
157 | struct syscall_metadata *entry; | |
158 | int ret; | |
159 | ||
64c12e04 | 160 | trace = (typeof(trace))ent; |
bed1ffca | 161 | syscall = trace->nr; |
bed1ffca | 162 | entry = syscall_nr_to_meta(syscall); |
64c12e04 | 163 | |
bed1ffca FW |
164 | if (!entry) { |
165 | trace_seq_printf(s, "\n"); | |
166 | return TRACE_TYPE_HANDLED; | |
167 | } | |
168 | ||
32c0edae | 169 | if (entry->exit_event->event.type != ent->type) { |
64c12e04 JB |
170 | WARN_ON_ONCE(1); |
171 | return TRACE_TYPE_UNHANDLED; | |
172 | } | |
173 | ||
bed1ffca FW |
174 | ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name, |
175 | trace->ret); | |
176 | if (!ret) | |
177 | return TRACE_TYPE_PARTIAL_LINE; | |
178 | ||
179 | return TRACE_TYPE_HANDLED; | |
180 | } | |
181 | ||
e6971969 LZ |
182 | extern char *__bad_type_size(void); |
183 | ||
184 | #define SYSCALL_FIELD(type, name) \ | |
185 | sizeof(type) != sizeof(trace.name) ? \ | |
186 | __bad_type_size() : \ | |
26a50744 TZ |
187 | #type, #name, offsetof(typeof(trace), name), \ |
188 | sizeof(trace.name), is_signed_type(type) | |
e6971969 | 189 | |
50307a45 LJ |
190 | static |
191 | int __set_enter_print_fmt(struct syscall_metadata *entry, char *buf, int len) | |
192 | { | |
193 | int i; | |
194 | int pos = 0; | |
195 | ||
196 | /* When len=0, we just calculate the needed length */ | |
197 | #define LEN_OR_ZERO (len ? len - pos : 0) | |
198 | ||
199 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); | |
200 | for (i = 0; i < entry->nb_args; i++) { | |
201 | pos += snprintf(buf + pos, LEN_OR_ZERO, "%s: 0x%%0%zulx%s", | |
202 | entry->args[i], sizeof(unsigned long), | |
203 | i == entry->nb_args - 1 ? "" : ", "); | |
204 | } | |
205 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); | |
206 | ||
207 | for (i = 0; i < entry->nb_args; i++) { | |
208 | pos += snprintf(buf + pos, LEN_OR_ZERO, | |
209 | ", ((unsigned long)(REC->%s))", entry->args[i]); | |
210 | } | |
211 | ||
212 | #undef LEN_OR_ZERO | |
213 | ||
214 | /* return the length of print_fmt */ | |
215 | return pos; | |
216 | } | |
217 | ||
218 | static int set_syscall_print_fmt(struct ftrace_event_call *call) | |
219 | { | |
220 | char *print_fmt; | |
221 | int len; | |
222 | struct syscall_metadata *entry = call->data; | |
223 | ||
224 | if (entry->enter_event != call) { | |
225 | call->print_fmt = "\"0x%lx\", REC->ret"; | |
226 | return 0; | |
227 | } | |
228 | ||
229 | /* First: called with 0 length to calculate the needed length */ | |
230 | len = __set_enter_print_fmt(entry, NULL, 0); | |
231 | ||
232 | print_fmt = kmalloc(len + 1, GFP_KERNEL); | |
233 | if (!print_fmt) | |
234 | return -ENOMEM; | |
235 | ||
236 | /* Second: actually write the @print_fmt */ | |
237 | __set_enter_print_fmt(entry, print_fmt, len + 1); | |
238 | call->print_fmt = print_fmt; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static void free_syscall_print_fmt(struct ftrace_event_call *call) | |
244 | { | |
245 | struct syscall_metadata *entry = call->data; | |
246 | ||
247 | if (entry->enter_event == call) | |
248 | kfree(call->print_fmt); | |
249 | } | |
250 | ||
2e33af02 | 251 | static int syscall_enter_define_fields(struct ftrace_event_call *call) |
540b7b8d LZ |
252 | { |
253 | struct syscall_trace_enter trace; | |
31c16b13 | 254 | struct syscall_metadata *meta = call->data; |
540b7b8d | 255 | int ret; |
540b7b8d LZ |
256 | int i; |
257 | int offset = offsetof(typeof(trace), args); | |
258 | ||
0f1ef51d LJ |
259 | ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER); |
260 | if (ret) | |
261 | return ret; | |
262 | ||
540b7b8d | 263 | for (i = 0; i < meta->nb_args; i++) { |
aeaeae11 FW |
264 | ret = trace_define_field(call, meta->types[i], |
265 | meta->args[i], offset, | |
43b51ead LZ |
266 | sizeof(unsigned long), 0, |
267 | FILTER_OTHER); | |
540b7b8d LZ |
268 | offset += sizeof(unsigned long); |
269 | } | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
2e33af02 | 274 | static int syscall_exit_define_fields(struct ftrace_event_call *call) |
540b7b8d LZ |
275 | { |
276 | struct syscall_trace_exit trace; | |
277 | int ret; | |
278 | ||
0f1ef51d LJ |
279 | ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER); |
280 | if (ret) | |
281 | return ret; | |
282 | ||
26a50744 | 283 | ret = trace_define_field(call, SYSCALL_FIELD(long, ret), |
43b51ead | 284 | FILTER_OTHER); |
540b7b8d LZ |
285 | |
286 | return ret; | |
287 | } | |
288 | ||
38516ab5 | 289 | void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id) |
ee08c6ec | 290 | { |
bed1ffca FW |
291 | struct syscall_trace_enter *entry; |
292 | struct syscall_metadata *sys_data; | |
293 | struct ring_buffer_event *event; | |
e77405ad | 294 | struct ring_buffer *buffer; |
bed1ffca | 295 | int size; |
ee08c6ec FW |
296 | int syscall_nr; |
297 | ||
298 | syscall_nr = syscall_get_nr(current, regs); | |
cd0980fc HB |
299 | if (syscall_nr < 0) |
300 | return; | |
fb34a08c JB |
301 | if (!test_bit(syscall_nr, enabled_enter_syscalls)) |
302 | return; | |
ee08c6ec | 303 | |
bed1ffca FW |
304 | sys_data = syscall_nr_to_meta(syscall_nr); |
305 | if (!sys_data) | |
306 | return; | |
307 | ||
308 | size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args; | |
309 | ||
fcc19438 | 310 | event = trace_current_buffer_lock_reserve(&buffer, |
32c0edae | 311 | sys_data->enter_event->event.type, size, 0, 0); |
bed1ffca FW |
312 | if (!event) |
313 | return; | |
314 | ||
315 | entry = ring_buffer_event_data(event); | |
316 | entry->nr = syscall_nr; | |
317 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args); | |
318 | ||
e77405ad SR |
319 | if (!filter_current_check_discard(buffer, sys_data->enter_event, |
320 | entry, event)) | |
321 | trace_current_buffer_unlock_commit(buffer, event, 0, 0); | |
ee08c6ec FW |
322 | } |
323 | ||
38516ab5 | 324 | void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret) |
ee08c6ec | 325 | { |
bed1ffca FW |
326 | struct syscall_trace_exit *entry; |
327 | struct syscall_metadata *sys_data; | |
328 | struct ring_buffer_event *event; | |
e77405ad | 329 | struct ring_buffer *buffer; |
ee08c6ec FW |
330 | int syscall_nr; |
331 | ||
332 | syscall_nr = syscall_get_nr(current, regs); | |
cd0980fc HB |
333 | if (syscall_nr < 0) |
334 | return; | |
fb34a08c JB |
335 | if (!test_bit(syscall_nr, enabled_exit_syscalls)) |
336 | return; | |
ee08c6ec | 337 | |
bed1ffca FW |
338 | sys_data = syscall_nr_to_meta(syscall_nr); |
339 | if (!sys_data) | |
340 | return; | |
341 | ||
fcc19438 | 342 | event = trace_current_buffer_lock_reserve(&buffer, |
32c0edae | 343 | sys_data->exit_event->event.type, sizeof(*entry), 0, 0); |
bed1ffca FW |
344 | if (!event) |
345 | return; | |
346 | ||
347 | entry = ring_buffer_event_data(event); | |
348 | entry->nr = syscall_nr; | |
349 | entry->ret = syscall_get_return_value(current, regs); | |
350 | ||
e77405ad SR |
351 | if (!filter_current_check_discard(buffer, sys_data->exit_event, |
352 | entry, event)) | |
353 | trace_current_buffer_unlock_commit(buffer, event, 0, 0); | |
ee08c6ec FW |
354 | } |
355 | ||
bd1a5c84 | 356 | int reg_event_syscall_enter(struct ftrace_event_call *call) |
ee08c6ec | 357 | { |
fb34a08c JB |
358 | int ret = 0; |
359 | int num; | |
fb34a08c | 360 | |
c252f657 | 361 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
57421dbb | 362 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
363 | return -ENOSYS; |
364 | mutex_lock(&syscall_trace_lock); | |
365 | if (!sys_refcount_enter) | |
38516ab5 | 366 | ret = register_trace_sys_enter(ftrace_syscall_enter, NULL); |
3b8e4273 | 367 | if (!ret) { |
fb34a08c JB |
368 | set_bit(num, enabled_enter_syscalls); |
369 | sys_refcount_enter++; | |
370 | } | |
371 | mutex_unlock(&syscall_trace_lock); | |
372 | return ret; | |
ee08c6ec FW |
373 | } |
374 | ||
bd1a5c84 | 375 | void unreg_event_syscall_enter(struct ftrace_event_call *call) |
ee08c6ec | 376 | { |
fb34a08c | 377 | int num; |
ee08c6ec | 378 | |
c252f657 | 379 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
57421dbb | 380 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
381 | return; |
382 | mutex_lock(&syscall_trace_lock); | |
383 | sys_refcount_enter--; | |
384 | clear_bit(num, enabled_enter_syscalls); | |
385 | if (!sys_refcount_enter) | |
38516ab5 | 386 | unregister_trace_sys_enter(ftrace_syscall_enter, NULL); |
fb34a08c JB |
387 | mutex_unlock(&syscall_trace_lock); |
388 | } | |
ee08c6ec | 389 | |
bd1a5c84 | 390 | int reg_event_syscall_exit(struct ftrace_event_call *call) |
ee08c6ec | 391 | { |
fb34a08c JB |
392 | int ret = 0; |
393 | int num; | |
fb34a08c | 394 | |
c252f657 | 395 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
57421dbb | 396 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
397 | return -ENOSYS; |
398 | mutex_lock(&syscall_trace_lock); | |
399 | if (!sys_refcount_exit) | |
38516ab5 | 400 | ret = register_trace_sys_exit(ftrace_syscall_exit, NULL); |
3b8e4273 | 401 | if (!ret) { |
fb34a08c JB |
402 | set_bit(num, enabled_exit_syscalls); |
403 | sys_refcount_exit++; | |
ee08c6ec | 404 | } |
fb34a08c JB |
405 | mutex_unlock(&syscall_trace_lock); |
406 | return ret; | |
407 | } | |
ee08c6ec | 408 | |
bd1a5c84 | 409 | void unreg_event_syscall_exit(struct ftrace_event_call *call) |
fb34a08c JB |
410 | { |
411 | int num; | |
ee08c6ec | 412 | |
c252f657 | 413 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
57421dbb | 414 | if (num < 0 || num >= NR_syscalls) |
fb34a08c JB |
415 | return; |
416 | mutex_lock(&syscall_trace_lock); | |
417 | sys_refcount_exit--; | |
418 | clear_bit(num, enabled_exit_syscalls); | |
419 | if (!sys_refcount_exit) | |
38516ab5 | 420 | unregister_trace_sys_exit(ftrace_syscall_exit, NULL); |
fb34a08c | 421 | mutex_unlock(&syscall_trace_lock); |
ee08c6ec | 422 | } |
fb34a08c | 423 | |
a1301da0 LJ |
424 | int init_syscall_trace(struct ftrace_event_call *call) |
425 | { | |
426 | int id; | |
ba976970 IM |
427 | int num; |
428 | ||
429 | num = ((struct syscall_metadata *)call->data)->syscall_nr; | |
430 | if (num < 0 || num >= NR_syscalls) { | |
431 | pr_debug("syscall %s metadata not mapped, disabling ftrace event\n", | |
432 | ((struct syscall_metadata *)call->data)->name); | |
433 | return -ENOSYS; | |
434 | } | |
a1301da0 | 435 | |
50307a45 LJ |
436 | if (set_syscall_print_fmt(call) < 0) |
437 | return -ENOMEM; | |
438 | ||
c7ef3a90 SR |
439 | id = trace_event_raw_init(call); |
440 | ||
441 | if (id < 0) { | |
50307a45 | 442 | free_syscall_print_fmt(call); |
c7ef3a90 | 443 | return id; |
50307a45 | 444 | } |
c7ef3a90 SR |
445 | |
446 | return id; | |
a1301da0 LJ |
447 | } |
448 | ||
e7b8e675 MF |
449 | unsigned long __init arch_syscall_addr(int nr) |
450 | { | |
451 | return (unsigned long)sys_call_table[nr]; | |
452 | } | |
453 | ||
c44fc770 FW |
454 | int __init init_ftrace_syscalls(void) |
455 | { | |
456 | struct syscall_metadata *meta; | |
457 | unsigned long addr; | |
458 | int i; | |
459 | ||
460 | syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * | |
461 | NR_syscalls, GFP_KERNEL); | |
462 | if (!syscalls_metadata) { | |
463 | WARN_ON(1); | |
464 | return -ENOMEM; | |
465 | } | |
466 | ||
467 | for (i = 0; i < NR_syscalls; i++) { | |
468 | addr = arch_syscall_addr(i); | |
469 | meta = find_syscall_meta(addr); | |
c252f657 LJ |
470 | if (!meta) |
471 | continue; | |
472 | ||
473 | meta->syscall_nr = i; | |
c44fc770 FW |
474 | syscalls_metadata[i] = meta; |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
479 | core_initcall(init_ftrace_syscalls); | |
480 | ||
07b139c8 | 481 | #ifdef CONFIG_PERF_EVENTS |
19007a67 | 482 | |
97d5a220 FW |
483 | static DECLARE_BITMAP(enabled_perf_enter_syscalls, NR_syscalls); |
484 | static DECLARE_BITMAP(enabled_perf_exit_syscalls, NR_syscalls); | |
485 | static int sys_perf_refcount_enter; | |
486 | static int sys_perf_refcount_exit; | |
f4b5ffcc | 487 | |
38516ab5 | 488 | static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id) |
f4b5ffcc JB |
489 | { |
490 | struct syscall_metadata *sys_data; | |
20ab4425 | 491 | struct syscall_trace_enter *rec; |
1c024eca | 492 | struct hlist_head *head; |
f4b5ffcc | 493 | int syscall_nr; |
4ed7c92d | 494 | int rctx; |
19007a67 | 495 | int size; |
f4b5ffcc JB |
496 | |
497 | syscall_nr = syscall_get_nr(current, regs); | |
97d5a220 | 498 | if (!test_bit(syscall_nr, enabled_perf_enter_syscalls)) |
f4b5ffcc JB |
499 | return; |
500 | ||
501 | sys_data = syscall_nr_to_meta(syscall_nr); | |
502 | if (!sys_data) | |
503 | return; | |
504 | ||
19007a67 FW |
505 | /* get the size after alignment with the u32 buffer size field */ |
506 | size = sizeof(unsigned long) * sys_data->nb_args + sizeof(*rec); | |
507 | size = ALIGN(size + sizeof(u32), sizeof(u64)); | |
508 | size -= sizeof(u32); | |
509 | ||
97d5a220 FW |
510 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
511 | "perf buffer not large enough")) | |
20ab4425 FW |
512 | return; |
513 | ||
97d5a220 | 514 | rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size, |
ff5f149b | 515 | sys_data->enter_event->event.type, regs, &rctx); |
430ad5a6 XG |
516 | if (!rec) |
517 | return; | |
20ab4425 | 518 | |
20ab4425 FW |
519 | rec->nr = syscall_nr; |
520 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, | |
521 | (unsigned long *)&rec->args); | |
1c024eca | 522 | |
3771f077 | 523 | head = this_cpu_ptr(sys_data->enter_event->perf_events); |
1c024eca | 524 | perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head); |
f4b5ffcc JB |
525 | } |
526 | ||
97d5a220 | 527 | int perf_sysenter_enable(struct ftrace_event_call *call) |
f4b5ffcc JB |
528 | { |
529 | int ret = 0; | |
530 | int num; | |
531 | ||
3bbe84e9 | 532 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
f4b5ffcc JB |
533 | |
534 | mutex_lock(&syscall_trace_lock); | |
97d5a220 | 535 | if (!sys_perf_refcount_enter) |
38516ab5 | 536 | ret = register_trace_sys_enter(perf_syscall_enter, NULL); |
f4b5ffcc JB |
537 | if (ret) { |
538 | pr_info("event trace: Could not activate" | |
539 | "syscall entry trace point"); | |
540 | } else { | |
97d5a220 FW |
541 | set_bit(num, enabled_perf_enter_syscalls); |
542 | sys_perf_refcount_enter++; | |
f4b5ffcc JB |
543 | } |
544 | mutex_unlock(&syscall_trace_lock); | |
545 | return ret; | |
546 | } | |
547 | ||
97d5a220 | 548 | void perf_sysenter_disable(struct ftrace_event_call *call) |
f4b5ffcc JB |
549 | { |
550 | int num; | |
551 | ||
3bbe84e9 | 552 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
f4b5ffcc JB |
553 | |
554 | mutex_lock(&syscall_trace_lock); | |
97d5a220 FW |
555 | sys_perf_refcount_enter--; |
556 | clear_bit(num, enabled_perf_enter_syscalls); | |
557 | if (!sys_perf_refcount_enter) | |
38516ab5 | 558 | unregister_trace_sys_enter(perf_syscall_enter, NULL); |
f4b5ffcc JB |
559 | mutex_unlock(&syscall_trace_lock); |
560 | } | |
561 | ||
38516ab5 | 562 | static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret) |
f4b5ffcc JB |
563 | { |
564 | struct syscall_metadata *sys_data; | |
20ab4425 | 565 | struct syscall_trace_exit *rec; |
1c024eca | 566 | struct hlist_head *head; |
f4b5ffcc | 567 | int syscall_nr; |
4ed7c92d | 568 | int rctx; |
20ab4425 | 569 | int size; |
f4b5ffcc JB |
570 | |
571 | syscall_nr = syscall_get_nr(current, regs); | |
97d5a220 | 572 | if (!test_bit(syscall_nr, enabled_perf_exit_syscalls)) |
f4b5ffcc JB |
573 | return; |
574 | ||
575 | sys_data = syscall_nr_to_meta(syscall_nr); | |
576 | if (!sys_data) | |
577 | return; | |
578 | ||
20ab4425 FW |
579 | /* We can probably do that at build time */ |
580 | size = ALIGN(sizeof(*rec) + sizeof(u32), sizeof(u64)); | |
581 | size -= sizeof(u32); | |
19007a67 | 582 | |
20ab4425 FW |
583 | /* |
584 | * Impossible, but be paranoid with the future | |
585 | * How to put this check outside runtime? | |
586 | */ | |
97d5a220 FW |
587 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
588 | "exit event has grown above perf buffer size")) | |
20ab4425 FW |
589 | return; |
590 | ||
97d5a220 | 591 | rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size, |
ff5f149b | 592 | sys_data->exit_event->event.type, regs, &rctx); |
430ad5a6 XG |
593 | if (!rec) |
594 | return; | |
20ab4425 | 595 | |
20ab4425 FW |
596 | rec->nr = syscall_nr; |
597 | rec->ret = syscall_get_return_value(current, regs); | |
598 | ||
3771f077 | 599 | head = this_cpu_ptr(sys_data->exit_event->perf_events); |
1c024eca | 600 | perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head); |
f4b5ffcc JB |
601 | } |
602 | ||
97d5a220 | 603 | int perf_sysexit_enable(struct ftrace_event_call *call) |
f4b5ffcc JB |
604 | { |
605 | int ret = 0; | |
606 | int num; | |
607 | ||
3bbe84e9 | 608 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
f4b5ffcc JB |
609 | |
610 | mutex_lock(&syscall_trace_lock); | |
97d5a220 | 611 | if (!sys_perf_refcount_exit) |
38516ab5 | 612 | ret = register_trace_sys_exit(perf_syscall_exit, NULL); |
f4b5ffcc JB |
613 | if (ret) { |
614 | pr_info("event trace: Could not activate" | |
6574658b | 615 | "syscall exit trace point"); |
f4b5ffcc | 616 | } else { |
97d5a220 FW |
617 | set_bit(num, enabled_perf_exit_syscalls); |
618 | sys_perf_refcount_exit++; | |
f4b5ffcc JB |
619 | } |
620 | mutex_unlock(&syscall_trace_lock); | |
621 | return ret; | |
622 | } | |
623 | ||
97d5a220 | 624 | void perf_sysexit_disable(struct ftrace_event_call *call) |
f4b5ffcc JB |
625 | { |
626 | int num; | |
627 | ||
3bbe84e9 | 628 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
f4b5ffcc JB |
629 | |
630 | mutex_lock(&syscall_trace_lock); | |
97d5a220 FW |
631 | sys_perf_refcount_exit--; |
632 | clear_bit(num, enabled_perf_exit_syscalls); | |
633 | if (!sys_perf_refcount_exit) | |
38516ab5 | 634 | unregister_trace_sys_exit(perf_syscall_exit, NULL); |
f4b5ffcc JB |
635 | mutex_unlock(&syscall_trace_lock); |
636 | } | |
637 | ||
07b139c8 | 638 | #endif /* CONFIG_PERF_EVENTS */ |
f4b5ffcc | 639 | |
2239291a SR |
640 | static int syscall_enter_register(struct ftrace_event_call *event, |
641 | enum trace_reg type) | |
642 | { | |
643 | switch (type) { | |
644 | case TRACE_REG_REGISTER: | |
645 | return reg_event_syscall_enter(event); | |
646 | case TRACE_REG_UNREGISTER: | |
647 | unreg_event_syscall_enter(event); | |
648 | return 0; | |
649 | ||
650 | #ifdef CONFIG_PERF_EVENTS | |
651 | case TRACE_REG_PERF_REGISTER: | |
652 | return perf_sysenter_enable(event); | |
653 | case TRACE_REG_PERF_UNREGISTER: | |
654 | perf_sysenter_disable(event); | |
655 | return 0; | |
656 | #endif | |
657 | } | |
658 | return 0; | |
659 | } | |
660 | ||
661 | static int syscall_exit_register(struct ftrace_event_call *event, | |
662 | enum trace_reg type) | |
663 | { | |
664 | switch (type) { | |
665 | case TRACE_REG_REGISTER: | |
666 | return reg_event_syscall_exit(event); | |
667 | case TRACE_REG_UNREGISTER: | |
668 | unreg_event_syscall_exit(event); | |
669 | return 0; | |
670 | ||
671 | #ifdef CONFIG_PERF_EVENTS | |
672 | case TRACE_REG_PERF_REGISTER: | |
673 | return perf_sysexit_enable(event); | |
674 | case TRACE_REG_PERF_UNREGISTER: | |
675 | perf_sysexit_disable(event); | |
676 | return 0; | |
677 | #endif | |
678 | } | |
679 | return 0; | |
680 | } |