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infiniband: hns: avoid gcc-7.0.1 warning for uninitialized data
[linux/fpc-iii.git] / tools / lib / traceevent / event-parse.c
blob664c90c8e22ba429a9f7e00f588270e16d985ba4
1 /*
2 * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
3 *
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation;
8 * version 2.1 of the License (not later!)
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this program; if not, see <http://www.gnu.org/licenses>
17 *
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19 *
20 * The parts for function graph printing was taken and modified from the
21 * Linux Kernel that were written by
22 * - Copyright (C) 2009 Frederic Weisbecker,
23 * Frederic Weisbecker gave his permission to relicense the code to
24 * the Lesser General Public License.
25 */
26 #include <inttypes.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <stdarg.h>
31 #include <ctype.h>
32 #include <errno.h>
33 #include <stdint.h>
34 #include <limits.h>
35 #include <linux/string.h>
36
37 #include <netinet/in.h>
38 #include "event-parse.h"
39 #include "event-utils.h"
40
41 static const char *input_buf;
42 static unsigned long long input_buf_ptr;
43 static unsigned long long input_buf_siz;
44
45 static int is_flag_field;
46 static int is_symbolic_field;
47
48 static int show_warning = 1;
49
50 #define do_warning(fmt, ...) \
51 do { \
52 if (show_warning) \
53 warning(fmt, ##__VA_ARGS__); \
54 } while (0)
55
56 #define do_warning_event(event, fmt, ...) \
57 do { \
58 if (!show_warning) \
59 continue; \
60 \
61 if (event) \
62 warning("[%s:%s] " fmt, event->system, \
63 event->name, ##__VA_ARGS__); \
64 else \
65 warning(fmt, ##__VA_ARGS__); \
66 } while (0)
67
68 static void init_input_buf(const char *buf, unsigned long long size)
69 {
70 input_buf = buf;
71 input_buf_siz = size;
72 input_buf_ptr = 0;
73 }
74
75 const char *pevent_get_input_buf(void)
76 {
77 return input_buf;
78 }
79
80 unsigned long long pevent_get_input_buf_ptr(void)
81 {
82 return input_buf_ptr;
83 }
84
85 struct event_handler {
86 struct event_handler *next;
87 int id;
88 const char *sys_name;
89 const char *event_name;
90 pevent_event_handler_func func;
91 void *context;
92 };
93
94 struct pevent_func_params {
95 struct pevent_func_params *next;
96 enum pevent_func_arg_type type;
97 };
98
99 struct pevent_function_handler {
100 struct pevent_function_handler *next;
101 enum pevent_func_arg_type ret_type;
102 char *name;
103 pevent_func_handler func;
104 struct pevent_func_params *params;
105 int nr_args;
106 };
107
108 static unsigned long long
109 process_defined_func(struct trace_seq *s, void *data, int size,
110 struct event_format *event, struct print_arg *arg);
111
112 static void free_func_handle(struct pevent_function_handler *func);
113
114 /**
115 * pevent_buffer_init - init buffer for parsing
116 * @buf: buffer to parse
117 * @size: the size of the buffer
118 *
119 * For use with pevent_read_token(), this initializes the internal
120 * buffer that pevent_read_token() will parse.
121 */
122 void pevent_buffer_init(const char *buf, unsigned long long size)
123 {
124 init_input_buf(buf, size);
125 }
126
127 void breakpoint(void)
128 {
129 static int x;
130 x++;
131 }
132
133 struct print_arg *alloc_arg(void)
134 {
135 return calloc(1, sizeof(struct print_arg));
136 }
137
138 struct cmdline {
139 char *comm;
140 int pid;
141 };
142
143 static int cmdline_cmp(const void *a, const void *b)
144 {
145 const struct cmdline *ca = a;
146 const struct cmdline *cb = b;
147
148 if (ca->pid < cb->pid)
149 return -1;
150 if (ca->pid > cb->pid)
151 return 1;
152
153 return 0;
154 }
155
156 struct cmdline_list {
157 struct cmdline_list *next;
158 char *comm;
159 int pid;
160 };
161
162 static int cmdline_init(struct pevent *pevent)
163 {
164 struct cmdline_list *cmdlist = pevent->cmdlist;
165 struct cmdline_list *item;
166 struct cmdline *cmdlines;
167 int i;
168
169 cmdlines = malloc(sizeof(*cmdlines) * pevent->cmdline_count);
170 if (!cmdlines)
171 return -1;
172
173 i = 0;
174 while (cmdlist) {
175 cmdlines[i].pid = cmdlist->pid;
176 cmdlines[i].comm = cmdlist->comm;
177 i++;
178 item = cmdlist;
179 cmdlist = cmdlist->next;
180 free(item);
181 }
182
183 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
184
185 pevent->cmdlines = cmdlines;
186 pevent->cmdlist = NULL;
187
188 return 0;
189 }
190
191 static const char *find_cmdline(struct pevent *pevent, int pid)
192 {
193 const struct cmdline *comm;
194 struct cmdline key;
195
196 if (!pid)
197 return "<idle>";
198
199 if (!pevent->cmdlines && cmdline_init(pevent))
200 return "<not enough memory for cmdlines!>";
201
202 key.pid = pid;
203
204 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
205 sizeof(*pevent->cmdlines), cmdline_cmp);
206
207 if (comm)
208 return comm->comm;
209 return "<...>";
210 }
211
212 /**
213 * pevent_pid_is_registered - return if a pid has a cmdline registered
214 * @pevent: handle for the pevent
215 * @pid: The pid to check if it has a cmdline registered with.
216 *
217 * Returns 1 if the pid has a cmdline mapped to it
218 * 0 otherwise.
219 */
220 int pevent_pid_is_registered(struct pevent *pevent, int pid)
221 {
222 const struct cmdline *comm;
223 struct cmdline key;
224
225 if (!pid)
226 return 1;
227
228 if (!pevent->cmdlines && cmdline_init(pevent))
229 return 0;
230
231 key.pid = pid;
232
233 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
234 sizeof(*pevent->cmdlines), cmdline_cmp);
235
236 if (comm)
237 return 1;
238 return 0;
239 }
240
241 /*
242 * If the command lines have been converted to an array, then
243 * we must add this pid. This is much slower than when cmdlines
244 * are added before the array is initialized.
245 */
246 static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
247 {
248 struct cmdline *cmdlines = pevent->cmdlines;
249 const struct cmdline *cmdline;
250 struct cmdline key;
251
252 if (!pid)
253 return 0;
254
255 /* avoid duplicates */
256 key.pid = pid;
257
258 cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
259 sizeof(*pevent->cmdlines), cmdline_cmp);
260 if (cmdline) {
261 errno = EEXIST;
262 return -1;
263 }
264
265 cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
266 if (!cmdlines) {
267 errno = ENOMEM;
268 return -1;
269 }
270
271 cmdlines[pevent->cmdline_count].comm = strdup(comm);
272 if (!cmdlines[pevent->cmdline_count].comm) {
273 free(cmdlines);
274 errno = ENOMEM;
275 return -1;
276 }
277
278 cmdlines[pevent->cmdline_count].pid = pid;
279
280 if (cmdlines[pevent->cmdline_count].comm)
281 pevent->cmdline_count++;
282
283 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
284 pevent->cmdlines = cmdlines;
285
286 return 0;
287 }
288
289 /**
290 * pevent_register_comm - register a pid / comm mapping
291 * @pevent: handle for the pevent
292 * @comm: the command line to register
293 * @pid: the pid to map the command line to
294 *
295 * This adds a mapping to search for command line names with
296 * a given pid. The comm is duplicated.
297 */
298 int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
299 {
300 struct cmdline_list *item;
301
302 if (pevent->cmdlines)
303 return add_new_comm(pevent, comm, pid);
304
305 item = malloc(sizeof(*item));
306 if (!item)
307 return -1;
308
309 if (comm)
310 item->comm = strdup(comm);
311 else
312 item->comm = strdup("<...>");
313 if (!item->comm) {
314 free(item);
315 return -1;
316 }
317 item->pid = pid;
318 item->next = pevent->cmdlist;
319
320 pevent->cmdlist = item;
321 pevent->cmdline_count++;
322
323 return 0;
324 }
325
326 int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock)
327 {
328 pevent->trace_clock = strdup(trace_clock);
329 if (!pevent->trace_clock) {
330 errno = ENOMEM;
331 return -1;
332 }
333 return 0;
334 }
335
336 struct func_map {
337 unsigned long long addr;
338 char *func;
339 char *mod;
340 };
341
342 struct func_list {
343 struct func_list *next;
344 unsigned long long addr;
345 char *func;
346 char *mod;
347 };
348
349 static int func_cmp(const void *a, const void *b)
350 {
351 const struct func_map *fa = a;
352 const struct func_map *fb = b;
353
354 if (fa->addr < fb->addr)
355 return -1;
356 if (fa->addr > fb->addr)
357 return 1;
358
359 return 0;
360 }
361
362 /*
363 * We are searching for a record in between, not an exact
364 * match.
365 */
366 static int func_bcmp(const void *a, const void *b)
367 {
368 const struct func_map *fa = a;
369 const struct func_map *fb = b;
370
371 if ((fa->addr == fb->addr) ||
372
373 (fa->addr > fb->addr &&
374 fa->addr < (fb+1)->addr))
375 return 0;
376
377 if (fa->addr < fb->addr)
378 return -1;
379
380 return 1;
381 }
382
383 static int func_map_init(struct pevent *pevent)
384 {
385 struct func_list *funclist;
386 struct func_list *item;
387 struct func_map *func_map;
388 int i;
389
390 func_map = malloc(sizeof(*func_map) * (pevent->func_count + 1));
391 if (!func_map)
392 return -1;
393
394 funclist = pevent->funclist;
395
396 i = 0;
397 while (funclist) {
398 func_map[i].func = funclist->func;
399 func_map[i].addr = funclist->addr;
400 func_map[i].mod = funclist->mod;
401 i++;
402 item = funclist;
403 funclist = funclist->next;
404 free(item);
405 }
406
407 qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
408
409 /*
410 * Add a special record at the end.
411 */
412 func_map[pevent->func_count].func = NULL;
413 func_map[pevent->func_count].addr = 0;
414 func_map[pevent->func_count].mod = NULL;
415
416 pevent->func_map = func_map;
417 pevent->funclist = NULL;
418
419 return 0;
420 }
421
422 static struct func_map *
423 __find_func(struct pevent *pevent, unsigned long long addr)
424 {
425 struct func_map *func;
426 struct func_map key;
427
428 if (!pevent->func_map)
429 func_map_init(pevent);
430
431 key.addr = addr;
432
433 func = bsearch(&key, pevent->func_map, pevent->func_count,
434 sizeof(*pevent->func_map), func_bcmp);
435
436 return func;
437 }
438
439 struct func_resolver {
440 pevent_func_resolver_t *func;
441 void *priv;
442 struct func_map map;
443 };
444
445 /**
446 * pevent_set_function_resolver - set an alternative function resolver
447 * @pevent: handle for the pevent
448 * @resolver: function to be used
449 * @priv: resolver function private state.
450 *
451 * Some tools may have already a way to resolve kernel functions, allow them to
452 * keep using it instead of duplicating all the entries inside
453 * pevent->funclist.
454 */
455 int pevent_set_function_resolver(struct pevent *pevent,
456 pevent_func_resolver_t *func, void *priv)
457 {
458 struct func_resolver *resolver = malloc(sizeof(*resolver));
459
460 if (resolver == NULL)
461 return -1;
462
463 resolver->func = func;
464 resolver->priv = priv;
465
466 free(pevent->func_resolver);
467 pevent->func_resolver = resolver;
468
469 return 0;
470 }
471
472 /**
473 * pevent_reset_function_resolver - reset alternative function resolver
474 * @pevent: handle for the pevent
475 *
476 * Stop using whatever alternative resolver was set, use the default
477 * one instead.
478 */
479 void pevent_reset_function_resolver(struct pevent *pevent)
480 {
481 free(pevent->func_resolver);
482 pevent->func_resolver = NULL;
483 }
484
485 static struct func_map *
486 find_func(struct pevent *pevent, unsigned long long addr)
487 {
488 struct func_map *map;
489
490 if (!pevent->func_resolver)
491 return __find_func(pevent, addr);
492
493 map = &pevent->func_resolver->map;
494 map->mod = NULL;
495 map->addr = addr;
496 map->func = pevent->func_resolver->func(pevent->func_resolver->priv,
497 &map->addr, &map->mod);
498 if (map->func == NULL)
499 return NULL;
500
501 return map;
502 }
503
504 /**
505 * pevent_find_function - find a function by a given address
506 * @pevent: handle for the pevent
507 * @addr: the address to find the function with
508 *
509 * Returns a pointer to the function stored that has the given
510 * address. Note, the address does not have to be exact, it
511 * will select the function that would contain the address.
512 */
513 const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
514 {
515 struct func_map *map;
516
517 map = find_func(pevent, addr);
518 if (!map)
519 return NULL;
520
521 return map->func;
522 }
523
524 /**
525 * pevent_find_function_address - find a function address by a given address
526 * @pevent: handle for the pevent
527 * @addr: the address to find the function with
528 *
529 * Returns the address the function starts at. This can be used in
530 * conjunction with pevent_find_function to print both the function
531 * name and the function offset.
532 */
533 unsigned long long
534 pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
535 {
536 struct func_map *map;
537
538 map = find_func(pevent, addr);
539 if (!map)
540 return 0;
541
542 return map->addr;
543 }
544
545 /**
546 * pevent_register_function - register a function with a given address
547 * @pevent: handle for the pevent
548 * @function: the function name to register
549 * @addr: the address the function starts at
550 * @mod: the kernel module the function may be in (NULL for none)
551 *
552 * This registers a function name with an address and module.
553 * The @func passed in is duplicated.
554 */
555 int pevent_register_function(struct pevent *pevent, char *func,
556 unsigned long long addr, char *mod)
557 {
558 struct func_list *item = malloc(sizeof(*item));
559
560 if (!item)
561 return -1;
562
563 item->next = pevent->funclist;
564 item->func = strdup(func);
565 if (!item->func)
566 goto out_free;
567
568 if (mod) {
569 item->mod = strdup(mod);
570 if (!item->mod)
571 goto out_free_func;
572 } else
573 item->mod = NULL;
574 item->addr = addr;
575
576 pevent->funclist = item;
577 pevent->func_count++;
578
579 return 0;
580
581 out_free_func:
582 free(item->func);
583 item->func = NULL;
584 out_free:
585 free(item);
586 errno = ENOMEM;
587 return -1;
588 }
589
590 /**
591 * pevent_print_funcs - print out the stored functions
592 * @pevent: handle for the pevent
593 *
594 * This prints out the stored functions.
595 */
596 void pevent_print_funcs(struct pevent *pevent)
597 {
598 int i;
599
600 if (!pevent->func_map)
601 func_map_init(pevent);
602
603 for (i = 0; i < (int)pevent->func_count; i++) {
604 printf("%016llx %s",
605 pevent->func_map[i].addr,
606 pevent->func_map[i].func);
607 if (pevent->func_map[i].mod)
608 printf(" [%s]\n", pevent->func_map[i].mod);
609 else
610 printf("\n");
611 }
612 }
613
614 struct printk_map {
615 unsigned long long addr;
616 char *printk;
617 };
618
619 struct printk_list {
620 struct printk_list *next;
621 unsigned long long addr;
622 char *printk;
623 };
624
625 static int printk_cmp(const void *a, const void *b)
626 {
627 const struct printk_map *pa = a;
628 const struct printk_map *pb = b;
629
630 if (pa->addr < pb->addr)
631 return -1;
632 if (pa->addr > pb->addr)
633 return 1;
634
635 return 0;
636 }
637
638 static int printk_map_init(struct pevent *pevent)
639 {
640 struct printk_list *printklist;
641 struct printk_list *item;
642 struct printk_map *printk_map;
643 int i;
644
645 printk_map = malloc(sizeof(*printk_map) * (pevent->printk_count + 1));
646 if (!printk_map)
647 return -1;
648
649 printklist = pevent->printklist;
650
651 i = 0;
652 while (printklist) {
653 printk_map[i].printk = printklist->printk;
654 printk_map[i].addr = printklist->addr;
655 i++;
656 item = printklist;
657 printklist = printklist->next;
658 free(item);
659 }
660
661 qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
662
663 pevent->printk_map = printk_map;
664 pevent->printklist = NULL;
665
666 return 0;
667 }
668
669 static struct printk_map *
670 find_printk(struct pevent *pevent, unsigned long long addr)
671 {
672 struct printk_map *printk;
673 struct printk_map key;
674
675 if (!pevent->printk_map && printk_map_init(pevent))
676 return NULL;
677
678 key.addr = addr;
679
680 printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
681 sizeof(*pevent->printk_map), printk_cmp);
682
683 return printk;
684 }
685
686 /**
687 * pevent_register_print_string - register a string by its address
688 * @pevent: handle for the pevent
689 * @fmt: the string format to register
690 * @addr: the address the string was located at
691 *
692 * This registers a string by the address it was stored in the kernel.
693 * The @fmt passed in is duplicated.
694 */
695 int pevent_register_print_string(struct pevent *pevent, const char *fmt,
696 unsigned long long addr)
697 {
698 struct printk_list *item = malloc(sizeof(*item));
699 char *p;
700
701 if (!item)
702 return -1;
703
704 item->next = pevent->printklist;
705 item->addr = addr;
706
707 /* Strip off quotes and '\n' from the end */
708 if (fmt[0] == '"')
709 fmt++;
710 item->printk = strdup(fmt);
711 if (!item->printk)
712 goto out_free;
713
714 p = item->printk + strlen(item->printk) - 1;
715 if (*p == '"')
716 *p = 0;
717
718 p -= 2;
719 if (strcmp(p, "\\n") == 0)
720 *p = 0;
721
722 pevent->printklist = item;
723 pevent->printk_count++;
724
725 return 0;
726
727 out_free:
728 free(item);
729 errno = ENOMEM;
730 return -1;
731 }
732
733 /**
734 * pevent_print_printk - print out the stored strings
735 * @pevent: handle for the pevent
736 *
737 * This prints the string formats that were stored.
738 */
739 void pevent_print_printk(struct pevent *pevent)
740 {
741 int i;
742
743 if (!pevent->printk_map)
744 printk_map_init(pevent);
745
746 for (i = 0; i < (int)pevent->printk_count; i++) {
747 printf("%016llx %s\n",
748 pevent->printk_map[i].addr,
749 pevent->printk_map[i].printk);
750 }
751 }
752
753 static struct event_format *alloc_event(void)
754 {
755 return calloc(1, sizeof(struct event_format));
756 }
757
758 static int add_event(struct pevent *pevent, struct event_format *event)
759 {
760 int i;
761 struct event_format **events = realloc(pevent->events, sizeof(event) *
762 (pevent->nr_events + 1));
763 if (!events)
764 return -1;
765
766 pevent->events = events;
767
768 for (i = 0; i < pevent->nr_events; i++) {
769 if (pevent->events[i]->id > event->id)
770 break;
771 }
772 if (i < pevent->nr_events)
773 memmove(&pevent->events[i + 1],
774 &pevent->events[i],
775 sizeof(event) * (pevent->nr_events - i));
776
777 pevent->events[i] = event;
778 pevent->nr_events++;
779
780 event->pevent = pevent;
781
782 return 0;
783 }
784
785 static int event_item_type(enum event_type type)
786 {
787 switch (type) {
788 case EVENT_ITEM ... EVENT_SQUOTE:
789 return 1;
790 case EVENT_ERROR ... EVENT_DELIM:
791 default:
792 return 0;
793 }
794 }
795
796 static void free_flag_sym(struct print_flag_sym *fsym)
797 {
798 struct print_flag_sym *next;
799
800 while (fsym) {
801 next = fsym->next;
802 free(fsym->value);
803 free(fsym->str);
804 free(fsym);
805 fsym = next;
806 }
807 }
808
809 static void free_arg(struct print_arg *arg)
810 {
811 struct print_arg *farg;
812
813 if (!arg)
814 return;
815
816 switch (arg->type) {
817 case PRINT_ATOM:
818 free(arg->atom.atom);
819 break;
820 case PRINT_FIELD:
821 free(arg->field.name);
822 break;
823 case PRINT_FLAGS:
824 free_arg(arg->flags.field);
825 free(arg->flags.delim);
826 free_flag_sym(arg->flags.flags);
827 break;
828 case PRINT_SYMBOL:
829 free_arg(arg->symbol.field);
830 free_flag_sym(arg->symbol.symbols);
831 break;
832 case PRINT_HEX:
833 free_arg(arg->hex.field);
834 free_arg(arg->hex.size);
835 break;
836 case PRINT_INT_ARRAY:
837 free_arg(arg->int_array.field);
838 free_arg(arg->int_array.count);
839 free_arg(arg->int_array.el_size);
840 break;
841 case PRINT_TYPE:
842 free(arg->typecast.type);
843 free_arg(arg->typecast.item);
844 break;
845 case PRINT_STRING:
846 case PRINT_BSTRING:
847 free(arg->string.string);
848 break;
849 case PRINT_BITMASK:
850 free(arg->bitmask.bitmask);
851 break;
852 case PRINT_DYNAMIC_ARRAY:
853 case PRINT_DYNAMIC_ARRAY_LEN:
854 free(arg->dynarray.index);
855 break;
856 case PRINT_OP:
857 free(arg->op.op);
858 free_arg(arg->op.left);
859 free_arg(arg->op.right);
860 break;
861 case PRINT_FUNC:
862 while (arg->func.args) {
863 farg = arg->func.args;
864 arg->func.args = farg->next;
865 free_arg(farg);
866 }
867 break;
868
869 case PRINT_NULL:
870 default:
871 break;
872 }
873
874 free(arg);
875 }
876
877 static enum event_type get_type(int ch)
878 {
879 if (ch == '\n')
880 return EVENT_NEWLINE;
881 if (isspace(ch))
882 return EVENT_SPACE;
883 if (isalnum(ch) || ch == '_')
884 return EVENT_ITEM;
885 if (ch == '\'')
886 return EVENT_SQUOTE;
887 if (ch == '"')
888 return EVENT_DQUOTE;
889 if (!isprint(ch))
890 return EVENT_NONE;
891 if (ch == '(' || ch == ')' || ch == ',')
892 return EVENT_DELIM;
893
894 return EVENT_OP;
895 }
896
897 static int __read_char(void)
898 {
899 if (input_buf_ptr >= input_buf_siz)
900 return -1;
901
902 return input_buf[input_buf_ptr++];
903 }
904
905 static int __peek_char(void)
906 {
907 if (input_buf_ptr >= input_buf_siz)
908 return -1;
909
910 return input_buf[input_buf_ptr];
911 }
912
913 /**
914 * pevent_peek_char - peek at the next character that will be read
915 *
916 * Returns the next character read, or -1 if end of buffer.
917 */
918 int pevent_peek_char(void)
919 {
920 return __peek_char();
921 }
922
923 static int extend_token(char **tok, char *buf, int size)
924 {
925 char *newtok = realloc(*tok, size);
926
927 if (!newtok) {
928 free(*tok);
929 *tok = NULL;
930 return -1;
931 }
932
933 if (!*tok)
934 strcpy(newtok, buf);
935 else
936 strcat(newtok, buf);
937 *tok = newtok;
938
939 return 0;
940 }
941
942 static enum event_type force_token(const char *str, char **tok);
943
944 static enum event_type __read_token(char **tok)
945 {
946 char buf[BUFSIZ];
947 int ch, last_ch, quote_ch, next_ch;
948 int i = 0;
949 int tok_size = 0;
950 enum event_type type;
951
952 *tok = NULL;
953
954
955 ch = __read_char();
956 if (ch < 0)
957 return EVENT_NONE;
958
959 type = get_type(ch);
960 if (type == EVENT_NONE)
961 return type;
962
963 buf[i++] = ch;
964
965 switch (type) {
966 case EVENT_NEWLINE:
967 case EVENT_DELIM:
968 if (asprintf(tok, "%c", ch) < 0)
969 return EVENT_ERROR;
970
971 return type;
972
973 case EVENT_OP:
974 switch (ch) {
975 case '-':
976 next_ch = __peek_char();
977 if (next_ch == '>') {
978 buf[i++] = __read_char();
979 break;
980 }
981 /* fall through */
982 case '+':
983 case '|':
984 case '&':
985 case '>':
986 case '<':
987 last_ch = ch;
988 ch = __peek_char();
989 if (ch != last_ch)
990 goto test_equal;
991 buf[i++] = __read_char();
992 switch (last_ch) {
993 case '>':
994 case '<':
995 goto test_equal;
996 default:
997 break;
998 }
999 break;
1000 case '!':
1001 case '=':
1002 goto test_equal;
1003 default: /* what should we do instead? */
1004 break;
1005 }
1006 buf[i] = 0;
1007 *tok = strdup(buf);
1008 return type;
1009
1010 test_equal:
1011 ch = __peek_char();
1012 if (ch == '=')
1013 buf[i++] = __read_char();
1014 goto out;
1015
1016 case EVENT_DQUOTE:
1017 case EVENT_SQUOTE:
1018 /* don't keep quotes */
1019 i--;
1020 quote_ch = ch;
1021 last_ch = 0;
1022 concat:
1023 do {
1024 if (i == (BUFSIZ - 1)) {
1025 buf[i] = 0;
1026 tok_size += BUFSIZ;
1027
1028 if (extend_token(tok, buf, tok_size) < 0)
1029 return EVENT_NONE;
1030 i = 0;
1031 }
1032 last_ch = ch;
1033 ch = __read_char();
1034 buf[i++] = ch;
1035 /* the '\' '\' will cancel itself */
1036 if (ch == '\\' && last_ch == '\\')
1037 last_ch = 0;
1038 } while (ch != quote_ch || last_ch == '\\');
1039 /* remove the last quote */
1040 i--;
1041
1042 /*
1043 * For strings (double quotes) check the next token.
1044 * If it is another string, concatinate the two.
1045 */
1046 if (type == EVENT_DQUOTE) {
1047 unsigned long long save_input_buf_ptr = input_buf_ptr;
1048
1049 do {
1050 ch = __read_char();
1051 } while (isspace(ch));
1052 if (ch == '"')
1053 goto concat;
1054 input_buf_ptr = save_input_buf_ptr;
1055 }
1056
1057 goto out;
1058
1059 case EVENT_ERROR ... EVENT_SPACE:
1060 case EVENT_ITEM:
1061 default:
1062 break;
1063 }
1064
1065 while (get_type(__peek_char()) == type) {
1066 if (i == (BUFSIZ - 1)) {
1067 buf[i] = 0;
1068 tok_size += BUFSIZ;
1069
1070 if (extend_token(tok, buf, tok_size) < 0)
1071 return EVENT_NONE;
1072 i = 0;
1073 }
1074 ch = __read_char();
1075 buf[i++] = ch;
1076 }
1077
1078 out:
1079 buf[i] = 0;
1080 if (extend_token(tok, buf, tok_size + i + 1) < 0)
1081 return EVENT_NONE;
1082
1083 if (type == EVENT_ITEM) {
1084 /*
1085 * Older versions of the kernel has a bug that
1086 * creates invalid symbols and will break the mac80211
1087 * parsing. This is a work around to that bug.
1088 *
1089 * See Linux kernel commit:
1090 * 811cb50baf63461ce0bdb234927046131fc7fa8b
1091 */
1092 if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
1093 free(*tok);
1094 *tok = NULL;
1095 return force_token("\"\%s\" ", tok);
1096 } else if (strcmp(*tok, "STA_PR_FMT") == 0) {
1097 free(*tok);
1098 *tok = NULL;
1099 return force_token("\" sta:%pM\" ", tok);
1100 } else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
1101 free(*tok);
1102 *tok = NULL;
1103 return force_token("\" vif:%p(%d)\" ", tok);
1104 }
1105 }
1106
1107 return type;
1108 }
1109
1110 static enum event_type force_token(const char *str, char **tok)
1111 {
1112 const char *save_input_buf;
1113 unsigned long long save_input_buf_ptr;
1114 unsigned long long save_input_buf_siz;
1115 enum event_type type;
1116
1117 /* save off the current input pointers */
1118 save_input_buf = input_buf;
1119 save_input_buf_ptr = input_buf_ptr;
1120 save_input_buf_siz = input_buf_siz;
1121
1122 init_input_buf(str, strlen(str));
1123
1124 type = __read_token(tok);
1125
1126 /* reset back to original token */
1127 input_buf = save_input_buf;
1128 input_buf_ptr = save_input_buf_ptr;
1129 input_buf_siz = save_input_buf_siz;
1130
1131 return type;
1132 }
1133
1134 static void free_token(char *tok)
1135 {
1136 if (tok)
1137 free(tok);
1138 }
1139
1140 static enum event_type read_token(char **tok)
1141 {
1142 enum event_type type;
1143
1144 for (;;) {
1145 type = __read_token(tok);
1146 if (type != EVENT_SPACE)
1147 return type;
1148
1149 free_token(*tok);
1150 }
1151
1152 /* not reached */
1153 *tok = NULL;
1154 return EVENT_NONE;
1155 }
1156
1157 /**
1158 * pevent_read_token - access to utilites to use the pevent parser
1159 * @tok: The token to return
1160 *
1161 * This will parse tokens from the string given by
1162 * pevent_init_data().
1163 *
1164 * Returns the token type.
1165 */
1166 enum event_type pevent_read_token(char **tok)
1167 {
1168 return read_token(tok);
1169 }
1170
1171 /**
1172 * pevent_free_token - free a token returned by pevent_read_token
1173 * @token: the token to free
1174 */
1175 void pevent_free_token(char *token)
1176 {
1177 free_token(token);
1178 }
1179
1180 /* no newline */
1181 static enum event_type read_token_item(char **tok)
1182 {
1183 enum event_type type;
1184
1185 for (;;) {
1186 type = __read_token(tok);
1187 if (type != EVENT_SPACE && type != EVENT_NEWLINE)
1188 return type;
1189 free_token(*tok);
1190 *tok = NULL;
1191 }
1192
1193 /* not reached */
1194 *tok = NULL;
1195 return EVENT_NONE;
1196 }
1197
1198 static int test_type(enum event_type type, enum event_type expect)
1199 {
1200 if (type != expect) {
1201 do_warning("Error: expected type %d but read %d",
1202 expect, type);
1203 return -1;
1204 }
1205 return 0;
1206 }
1207
1208 static int test_type_token(enum event_type type, const char *token,
1209 enum event_type expect, const char *expect_tok)
1210 {
1211 if (type != expect) {
1212 do_warning("Error: expected type %d but read %d",
1213 expect, type);
1214 return -1;
1215 }
1216
1217 if (strcmp(token, expect_tok) != 0) {
1218 do_warning("Error: expected '%s' but read '%s'",
1219 expect_tok, token);
1220 return -1;
1221 }
1222 return 0;
1223 }
1224
1225 static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
1226 {
1227 enum event_type type;
1228
1229 if (newline_ok)
1230 type = read_token(tok);
1231 else
1232 type = read_token_item(tok);
1233 return test_type(type, expect);
1234 }
1235
1236 static int read_expect_type(enum event_type expect, char **tok)
1237 {
1238 return __read_expect_type(expect, tok, 1);
1239 }
1240
1241 static int __read_expected(enum event_type expect, const char *str,
1242 int newline_ok)
1243 {
1244 enum event_type type;
1245 char *token;
1246 int ret;
1247
1248 if (newline_ok)
1249 type = read_token(&token);
1250 else
1251 type = read_token_item(&token);
1252
1253 ret = test_type_token(type, token, expect, str);
1254
1255 free_token(token);
1256
1257 return ret;
1258 }
1259
1260 static int read_expected(enum event_type expect, const char *str)
1261 {
1262 return __read_expected(expect, str, 1);
1263 }
1264
1265 static int read_expected_item(enum event_type expect, const char *str)
1266 {
1267 return __read_expected(expect, str, 0);
1268 }
1269
1270 static char *event_read_name(void)
1271 {
1272 char *token;
1273
1274 if (read_expected(EVENT_ITEM, "name") < 0)
1275 return NULL;
1276
1277 if (read_expected(EVENT_OP, ":") < 0)
1278 return NULL;
1279
1280 if (read_expect_type(EVENT_ITEM, &token) < 0)
1281 goto fail;
1282
1283 return token;
1284
1285 fail:
1286 free_token(token);
1287 return NULL;
1288 }
1289
1290 static int event_read_id(void)
1291 {
1292 char *token;
1293 int id;
1294
1295 if (read_expected_item(EVENT_ITEM, "ID") < 0)
1296 return -1;
1297
1298 if (read_expected(EVENT_OP, ":") < 0)
1299 return -1;
1300
1301 if (read_expect_type(EVENT_ITEM, &token) < 0)
1302 goto fail;
1303
1304 id = strtoul(token, NULL, 0);
1305 free_token(token);
1306 return id;
1307
1308 fail:
1309 free_token(token);
1310 return -1;
1311 }
1312
1313 static int field_is_string(struct format_field *field)
1314 {
1315 if ((field->flags & FIELD_IS_ARRAY) &&
1316 (strstr(field->type, "char") || strstr(field->type, "u8") ||
1317 strstr(field->type, "s8")))
1318 return 1;
1319
1320 return 0;
1321 }
1322
1323 static int field_is_dynamic(struct format_field *field)
1324 {
1325 if (strncmp(field->type, "__data_loc", 10) == 0)
1326 return 1;
1327
1328 return 0;
1329 }
1330
1331 static int field_is_long(struct format_field *field)
1332 {
1333 /* includes long long */
1334 if (strstr(field->type, "long"))
1335 return 1;
1336
1337 return 0;
1338 }
1339
1340 static unsigned int type_size(const char *name)
1341 {
1342 /* This covers all FIELD_IS_STRING types. */
1343 static struct {
1344 const char *type;
1345 unsigned int size;
1346 } table[] = {
1347 { "u8", 1 },
1348 { "u16", 2 },
1349 { "u32", 4 },
1350 { "u64", 8 },
1351 { "s8", 1 },
1352 { "s16", 2 },
1353 { "s32", 4 },
1354 { "s64", 8 },
1355 { "char", 1 },
1356 { },
1357 };
1358 int i;
1359
1360 for (i = 0; table[i].type; i++) {
1361 if (!strcmp(table[i].type, name))
1362 return table[i].size;
1363 }
1364
1365 return 0;
1366 }
1367
1368 static int event_read_fields(struct event_format *event, struct format_field **fields)
1369 {
1370 struct format_field *field = NULL;
1371 enum event_type type;
1372 char *token;
1373 char *last_token;
1374 int count = 0;
1375
1376 do {
1377 unsigned int size_dynamic = 0;
1378
1379 type = read_token(&token);
1380 if (type == EVENT_NEWLINE) {
1381 free_token(token);
1382 return count;
1383 }
1384
1385 count++;
1386
1387 if (test_type_token(type, token, EVENT_ITEM, "field"))
1388 goto fail;
1389 free_token(token);
1390
1391 type = read_token(&token);
1392 /*
1393 * The ftrace fields may still use the "special" name.
1394 * Just ignore it.
1395 */
1396 if (event->flags & EVENT_FL_ISFTRACE &&
1397 type == EVENT_ITEM && strcmp(token, "special") == 0) {
1398 free_token(token);
1399 type = read_token(&token);
1400 }
1401
1402 if (test_type_token(type, token, EVENT_OP, ":") < 0)
1403 goto fail;
1404
1405 free_token(token);
1406 if (read_expect_type(EVENT_ITEM, &token) < 0)
1407 goto fail;
1408
1409 last_token = token;
1410
1411 field = calloc(1, sizeof(*field));
1412 if (!field)
1413 goto fail;
1414
1415 field->event = event;
1416
1417 /* read the rest of the type */
1418 for (;;) {
1419 type = read_token(&token);
1420 if (type == EVENT_ITEM ||
1421 (type == EVENT_OP && strcmp(token, "*") == 0) ||
1422 /*
1423 * Some of the ftrace fields are broken and have
1424 * an illegal "." in them.
1425 */
1426 (event->flags & EVENT_FL_ISFTRACE &&
1427 type == EVENT_OP && strcmp(token, ".") == 0)) {
1428
1429 if (strcmp(token, "*") == 0)
1430 field->flags |= FIELD_IS_POINTER;
1431
1432 if (field->type) {
1433 char *new_type;
1434 new_type = realloc(field->type,
1435 strlen(field->type) +
1436 strlen(last_token) + 2);
1437 if (!new_type) {
1438 free(last_token);
1439 goto fail;
1440 }
1441 field->type = new_type;
1442 strcat(field->type, " ");
1443 strcat(field->type, last_token);
1444 free(last_token);
1445 } else
1446 field->type = last_token;
1447 last_token = token;
1448 continue;
1449 }
1450
1451 break;
1452 }
1453
1454 if (!field->type) {
1455 do_warning_event(event, "%s: no type found", __func__);
1456 goto fail;
1457 }
1458 field->name = field->alias = last_token;
1459
1460 if (test_type(type, EVENT_OP))
1461 goto fail;
1462
1463 if (strcmp(token, "[") == 0) {
1464 enum event_type last_type = type;
1465 char *brackets = token;
1466 char *new_brackets;
1467 int len;
1468
1469 field->flags |= FIELD_IS_ARRAY;
1470
1471 type = read_token(&token);
1472
1473 if (type == EVENT_ITEM)
1474 field->arraylen = strtoul(token, NULL, 0);
1475 else
1476 field->arraylen = 0;
1477
1478 while (strcmp(token, "]") != 0) {
1479 if (last_type == EVENT_ITEM &&
1480 type == EVENT_ITEM)
1481 len = 2;
1482 else
1483 len = 1;
1484 last_type = type;
1485
1486 new_brackets = realloc(brackets,
1487 strlen(brackets) +
1488 strlen(token) + len);
1489 if (!new_brackets) {
1490 free(brackets);
1491 goto fail;
1492 }
1493 brackets = new_brackets;
1494 if (len == 2)
1495 strcat(brackets, " ");
1496 strcat(brackets, token);
1497 /* We only care about the last token */
1498 field->arraylen = strtoul(token, NULL, 0);
1499 free_token(token);
1500 type = read_token(&token);
1501 if (type == EVENT_NONE) {
1502 do_warning_event(event, "failed to find token");
1503 goto fail;
1504 }
1505 }
1506
1507 free_token(token);
1508
1509 new_brackets = realloc(brackets, strlen(brackets) + 2);
1510 if (!new_brackets) {
1511 free(brackets);
1512 goto fail;
1513 }
1514 brackets = new_brackets;
1515 strcat(brackets, "]");
1516
1517 /* add brackets to type */
1518
1519 type = read_token(&token);
1520 /*
1521 * If the next token is not an OP, then it is of
1522 * the format: type [] item;
1523 */
1524 if (type == EVENT_ITEM) {
1525 char *new_type;
1526 new_type = realloc(field->type,
1527 strlen(field->type) +
1528 strlen(field->name) +
1529 strlen(brackets) + 2);
1530 if (!new_type) {
1531 free(brackets);
1532 goto fail;
1533 }
1534 field->type = new_type;
1535 strcat(field->type, " ");
1536 strcat(field->type, field->name);
1537 size_dynamic = type_size(field->name);
1538 free_token(field->name);
1539 strcat(field->type, brackets);
1540 field->name = field->alias = token;
1541 type = read_token(&token);
1542 } else {
1543 char *new_type;
1544 new_type = realloc(field->type,
1545 strlen(field->type) +
1546 strlen(brackets) + 1);
1547 if (!new_type) {
1548 free(brackets);
1549 goto fail;
1550 }
1551 field->type = new_type;
1552 strcat(field->type, brackets);
1553 }
1554 free(brackets);
1555 }
1556
1557 if (field_is_string(field))
1558 field->flags |= FIELD_IS_STRING;
1559 if (field_is_dynamic(field))
1560 field->flags |= FIELD_IS_DYNAMIC;
1561 if (field_is_long(field))
1562 field->flags |= FIELD_IS_LONG;
1563
1564 if (test_type_token(type, token, EVENT_OP, ";"))
1565 goto fail;
1566 free_token(token);
1567
1568 if (read_expected(EVENT_ITEM, "offset") < 0)
1569 goto fail_expect;
1570
1571 if (read_expected(EVENT_OP, ":") < 0)
1572 goto fail_expect;
1573
1574 if (read_expect_type(EVENT_ITEM, &token))
1575 goto fail;
1576 field->offset = strtoul(token, NULL, 0);
1577 free_token(token);
1578
1579 if (read_expected(EVENT_OP, ";") < 0)
1580 goto fail_expect;
1581
1582 if (read_expected(EVENT_ITEM, "size") < 0)
1583 goto fail_expect;
1584
1585 if (read_expected(EVENT_OP, ":") < 0)
1586 goto fail_expect;
1587
1588 if (read_expect_type(EVENT_ITEM, &token))
1589 goto fail;
1590 field->size = strtoul(token, NULL, 0);
1591 free_token(token);
1592
1593 if (read_expected(EVENT_OP, ";") < 0)
1594 goto fail_expect;
1595
1596 type = read_token(&token);
1597 if (type != EVENT_NEWLINE) {
1598 /* newer versions of the kernel have a "signed" type */
1599 if (test_type_token(type, token, EVENT_ITEM, "signed"))
1600 goto fail;
1601
1602 free_token(token);
1603
1604 if (read_expected(EVENT_OP, ":") < 0)
1605 goto fail_expect;
1606
1607 if (read_expect_type(EVENT_ITEM, &token))
1608 goto fail;
1609
1610 if (strtoul(token, NULL, 0))
1611 field->flags |= FIELD_IS_SIGNED;
1612
1613 free_token(token);
1614 if (read_expected(EVENT_OP, ";") < 0)
1615 goto fail_expect;
1616
1617 if (read_expect_type(EVENT_NEWLINE, &token))
1618 goto fail;
1619 }
1620
1621 free_token(token);
1622
1623 if (field->flags & FIELD_IS_ARRAY) {
1624 if (field->arraylen)
1625 field->elementsize = field->size / field->arraylen;
1626 else if (field->flags & FIELD_IS_DYNAMIC)
1627 field->elementsize = size_dynamic;
1628 else if (field->flags & FIELD_IS_STRING)
1629 field->elementsize = 1;
1630 else if (field->flags & FIELD_IS_LONG)
1631 field->elementsize = event->pevent ?
1632 event->pevent->long_size :
1633 sizeof(long);
1634 } else
1635 field->elementsize = field->size;
1636
1637 *fields = field;
1638 fields = &field->next;
1639
1640 } while (1);
1641
1642 return 0;
1643
1644 fail:
1645 free_token(token);
1646 fail_expect:
1647 if (field) {
1648 free(field->type);
1649 free(field->name);
1650 free(field);
1651 }
1652 return -1;
1653 }
1654
1655 static int event_read_format(struct event_format *event)
1656 {
1657 char *token;
1658 int ret;
1659
1660 if (read_expected_item(EVENT_ITEM, "format") < 0)
1661 return -1;
1662
1663 if (read_expected(EVENT_OP, ":") < 0)
1664 return -1;
1665
1666 if (read_expect_type(EVENT_NEWLINE, &token))
1667 goto fail;
1668 free_token(token);
1669
1670 ret = event_read_fields(event, &event->format.common_fields);
1671 if (ret < 0)
1672 return ret;
1673 event->format.nr_common = ret;
1674
1675 ret = event_read_fields(event, &event->format.fields);
1676 if (ret < 0)
1677 return ret;
1678 event->format.nr_fields = ret;
1679
1680 return 0;
1681
1682 fail:
1683 free_token(token);
1684 return -1;
1685 }
1686
1687 static enum event_type
1688 process_arg_token(struct event_format *event, struct print_arg *arg,
1689 char **tok, enum event_type type);
1690
1691 static enum event_type
1692 process_arg(struct event_format *event, struct print_arg *arg, char **tok)
1693 {
1694 enum event_type type;
1695 char *token;
1696
1697 type = read_token(&token);
1698 *tok = token;
1699
1700 return process_arg_token(event, arg, tok, type);
1701 }
1702
1703 static enum event_type
1704 process_op(struct event_format *event, struct print_arg *arg, char **tok);
1705
1706 /*
1707 * For __print_symbolic() and __print_flags, we need to completely
1708 * evaluate the first argument, which defines what to print next.
1709 */
1710 static enum event_type
1711 process_field_arg(struct event_format *event, struct print_arg *arg, char **tok)
1712 {
1713 enum event_type type;
1714
1715 type = process_arg(event, arg, tok);
1716
1717 while (type == EVENT_OP) {
1718 type = process_op(event, arg, tok);
1719 }
1720
1721 return type;
1722 }
1723
1724 static enum event_type
1725 process_cond(struct event_format *event, struct print_arg *top, char **tok)
1726 {
1727 struct print_arg *arg, *left, *right;
1728 enum event_type type;
1729 char *token = NULL;
1730
1731 arg = alloc_arg();
1732 left = alloc_arg();
1733 right = alloc_arg();
1734
1735 if (!arg || !left || !right) {
1736 do_warning_event(event, "%s: not enough memory!", __func__);
1737 /* arg will be freed at out_free */
1738 free_arg(left);
1739 free_arg(right);
1740 goto out_free;
1741 }
1742
1743 arg->type = PRINT_OP;
1744 arg->op.left = left;
1745 arg->op.right = right;
1746
1747 *tok = NULL;
1748 type = process_arg(event, left, &token);
1749
1750 again:
1751 if (type == EVENT_ERROR)
1752 goto out_free;
1753
1754 /* Handle other operations in the arguments */
1755 if (type == EVENT_OP && strcmp(token, ":") != 0) {
1756 type = process_op(event, left, &token);
1757 goto again;
1758 }
1759
1760 if (test_type_token(type, token, EVENT_OP, ":"))
1761 goto out_free;
1762
1763 arg->op.op = token;
1764
1765 type = process_arg(event, right, &token);
1766
1767 top->op.right = arg;
1768
1769 *tok = token;
1770 return type;
1771
1772 out_free:
1773 /* Top may point to itself */
1774 top->op.right = NULL;
1775 free_token(token);
1776 free_arg(arg);
1777 return EVENT_ERROR;
1778 }
1779
1780 static enum event_type
1781 process_array(struct event_format *event, struct print_arg *top, char **tok)
1782 {
1783 struct print_arg *arg;
1784 enum event_type type;
1785 char *token = NULL;
1786
1787 arg = alloc_arg();
1788 if (!arg) {
1789 do_warning_event(event, "%s: not enough memory!", __func__);
1790 /* '*tok' is set to top->op.op. No need to free. */
1791 *tok = NULL;
1792 return EVENT_ERROR;
1793 }
1794
1795 *tok = NULL;
1796 type = process_arg(event, arg, &token);
1797 if (test_type_token(type, token, EVENT_OP, "]"))
1798 goto out_free;
1799
1800 top->op.right = arg;
1801
1802 free_token(token);
1803 type = read_token_item(&token);
1804 *tok = token;
1805
1806 return type;
1807
1808 out_free:
1809 free_token(token);
1810 free_arg(arg);
1811 return EVENT_ERROR;
1812 }
1813
1814 static int get_op_prio(char *op)
1815 {
1816 if (!op[1]) {
1817 switch (op[0]) {
1818 case '~':
1819 case '!':
1820 return 4;
1821 case '*':
1822 case '/':
1823 case '%':
1824 return 6;
1825 case '+':
1826 case '-':
1827 return 7;
1828 /* '>>' and '<<' are 8 */
1829 case '<':
1830 case '>':
1831 return 9;
1832 /* '==' and '!=' are 10 */
1833 case '&':
1834 return 11;
1835 case '^':
1836 return 12;
1837 case '|':
1838 return 13;
1839 case '?':
1840 return 16;
1841 default:
1842 do_warning("unknown op '%c'", op[0]);
1843 return -1;
1844 }
1845 } else {
1846 if (strcmp(op, "++") == 0 ||
1847 strcmp(op, "--") == 0) {
1848 return 3;
1849 } else if (strcmp(op, ">>") == 0 ||
1850 strcmp(op, "<<") == 0) {
1851 return 8;
1852 } else if (strcmp(op, ">=") == 0 ||
1853 strcmp(op, "<=") == 0) {
1854 return 9;
1855 } else if (strcmp(op, "==") == 0 ||
1856 strcmp(op, "!=") == 0) {
1857 return 10;
1858 } else if (strcmp(op, "&&") == 0) {
1859 return 14;
1860 } else if (strcmp(op, "||") == 0) {
1861 return 15;
1862 } else {
1863 do_warning("unknown op '%s'", op);
1864 return -1;
1865 }
1866 }
1867 }
1868
1869 static int set_op_prio(struct print_arg *arg)
1870 {
1871
1872 /* single ops are the greatest */
1873 if (!arg->op.left || arg->op.left->type == PRINT_NULL)
1874 arg->op.prio = 0;
1875 else
1876 arg->op.prio = get_op_prio(arg->op.op);
1877
1878 return arg->op.prio;
1879 }
1880
1881 /* Note, *tok does not get freed, but will most likely be saved */
1882 static enum event_type
1883 process_op(struct event_format *event, struct print_arg *arg, char **tok)
1884 {
1885 struct print_arg *left, *right = NULL;
1886 enum event_type type;
1887 char *token;
1888
1889 /* the op is passed in via tok */
1890 token = *tok;
1891
1892 if (arg->type == PRINT_OP && !arg->op.left) {
1893 /* handle single op */
1894 if (token[1]) {
1895 do_warning_event(event, "bad op token %s", token);
1896 goto out_free;
1897 }
1898 switch (token[0]) {
1899 case '~':
1900 case '!':
1901 case '+':
1902 case '-':
1903 break;
1904 default:
1905 do_warning_event(event, "bad op token %s", token);
1906 goto out_free;
1907
1908 }
1909
1910 /* make an empty left */
1911 left = alloc_arg();
1912 if (!left)
1913 goto out_warn_free;
1914
1915 left->type = PRINT_NULL;
1916 arg->op.left = left;
1917
1918 right = alloc_arg();
1919 if (!right)
1920 goto out_warn_free;
1921
1922 arg->op.right = right;
1923
1924 /* do not free the token, it belongs to an op */
1925 *tok = NULL;
1926 type = process_arg(event, right, tok);
1927
1928 } else if (strcmp(token, "?") == 0) {
1929
1930 left = alloc_arg();
1931 if (!left)
1932 goto out_warn_free;
1933
1934 /* copy the top arg to the left */
1935 *left = *arg;
1936
1937 arg->type = PRINT_OP;
1938 arg->op.op = token;
1939 arg->op.left = left;
1940 arg->op.prio = 0;
1941
1942 /* it will set arg->op.right */
1943 type = process_cond(event, arg, tok);
1944
1945 } else if (strcmp(token, ">>") == 0 ||
1946 strcmp(token, "<<") == 0 ||
1947 strcmp(token, "&") == 0 ||
1948 strcmp(token, "|") == 0 ||
1949 strcmp(token, "&&") == 0 ||
1950 strcmp(token, "||") == 0 ||
1951 strcmp(token, "-") == 0 ||
1952 strcmp(token, "+") == 0 ||
1953 strcmp(token, "*") == 0 ||
1954 strcmp(token, "^") == 0 ||
1955 strcmp(token, "/") == 0 ||
1956 strcmp(token, "%") == 0 ||
1957 strcmp(token, "<") == 0 ||
1958 strcmp(token, ">") == 0 ||
1959 strcmp(token, "<=") == 0 ||
1960 strcmp(token, ">=") == 0 ||
1961 strcmp(token, "==") == 0 ||
1962 strcmp(token, "!=") == 0) {
1963
1964 left = alloc_arg();
1965 if (!left)
1966 goto out_warn_free;
1967
1968 /* copy the top arg to the left */
1969 *left = *arg;
1970
1971 arg->type = PRINT_OP;
1972 arg->op.op = token;
1973 arg->op.left = left;
1974 arg->op.right = NULL;
1975
1976 if (set_op_prio(arg) == -1) {
1977 event->flags |= EVENT_FL_FAILED;
1978 /* arg->op.op (= token) will be freed at out_free */
1979 arg->op.op = NULL;
1980 goto out_free;
1981 }
1982
1983 type = read_token_item(&token);
1984 *tok = token;
1985
1986 /* could just be a type pointer */
1987 if ((strcmp(arg->op.op, "*") == 0) &&
1988 type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1989 char *new_atom;
1990
1991 if (left->type != PRINT_ATOM) {
1992 do_warning_event(event, "bad pointer type");
1993 goto out_free;
1994 }
1995 new_atom = realloc(left->atom.atom,
1996 strlen(left->atom.atom) + 3);
1997 if (!new_atom)
1998 goto out_warn_free;
1999
2000 left->atom.atom = new_atom;
2001 strcat(left->atom.atom, " *");
2002 free(arg->op.op);
2003 *arg = *left;
2004 free(left);
2005
2006 return type;
2007 }
2008
2009 right = alloc_arg();
2010 if (!right)
2011 goto out_warn_free;
2012
2013 type = process_arg_token(event, right, tok, type);
2014 if (type == EVENT_ERROR) {
2015 free_arg(right);
2016 /* token was freed in process_arg_token() via *tok */
2017 token = NULL;
2018 goto out_free;
2019 }
2020
2021 if (right->type == PRINT_OP &&
2022 get_op_prio(arg->op.op) < get_op_prio(right->op.op)) {
2023 struct print_arg tmp;
2024
2025 /* rotate ops according to the priority */
2026 arg->op.right = right->op.left;
2027
2028 tmp = *arg;
2029 *arg = *right;
2030 *right = tmp;
2031
2032 arg->op.left = right;
2033 } else {
2034 arg->op.right = right;
2035 }
2036
2037 } else if (strcmp(token, "[") == 0) {
2038
2039 left = alloc_arg();
2040 if (!left)
2041 goto out_warn_free;
2042
2043 *left = *arg;
2044
2045 arg->type = PRINT_OP;
2046 arg->op.op = token;
2047 arg->op.left = left;
2048
2049 arg->op.prio = 0;
2050
2051 /* it will set arg->op.right */
2052 type = process_array(event, arg, tok);
2053
2054 } else {
2055 do_warning_event(event, "unknown op '%s'", token);
2056 event->flags |= EVENT_FL_FAILED;
2057 /* the arg is now the left side */
2058 goto out_free;
2059 }
2060
2061 if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
2062 int prio;
2063
2064 /* higher prios need to be closer to the root */
2065 prio = get_op_prio(*tok);
2066
2067 if (prio > arg->op.prio)
2068 return process_op(event, arg, tok);
2069
2070 return process_op(event, right, tok);
2071 }
2072
2073 return type;
2074
2075 out_warn_free:
2076 do_warning_event(event, "%s: not enough memory!", __func__);
2077 out_free:
2078 free_token(token);
2079 *tok = NULL;
2080 return EVENT_ERROR;
2081 }
2082
2083 static enum event_type
2084 process_entry(struct event_format *event __maybe_unused, struct print_arg *arg,
2085 char **tok)
2086 {
2087 enum event_type type;
2088 char *field;
2089 char *token;
2090
2091 if (read_expected(EVENT_OP, "->") < 0)
2092 goto out_err;
2093
2094 if (read_expect_type(EVENT_ITEM, &token) < 0)
2095 goto out_free;
2096 field = token;
2097
2098 arg->type = PRINT_FIELD;
2099 arg->field.name = field;
2100
2101 if (is_flag_field) {
2102 arg->field.field = pevent_find_any_field(event, arg->field.name);
2103 arg->field.field->flags |= FIELD_IS_FLAG;
2104 is_flag_field = 0;
2105 } else if (is_symbolic_field) {
2106 arg->field.field = pevent_find_any_field(event, arg->field.name);
2107 arg->field.field->flags |= FIELD_IS_SYMBOLIC;
2108 is_symbolic_field = 0;
2109 }
2110
2111 type = read_token(&token);
2112 *tok = token;
2113
2114 return type;
2115
2116 out_free:
2117 free_token(token);
2118 out_err:
2119 *tok = NULL;
2120 return EVENT_ERROR;
2121 }
2122
2123 static int alloc_and_process_delim(struct event_format *event, char *next_token,
2124 struct print_arg **print_arg)
2125 {
2126 struct print_arg *field;
2127 enum event_type type;
2128 char *token;
2129 int ret = 0;
2130
2131 field = alloc_arg();
2132 if (!field) {
2133 do_warning_event(event, "%s: not enough memory!", __func__);
2134 errno = ENOMEM;
2135 return -1;
2136 }
2137
2138 type = process_arg(event, field, &token);
2139
2140 if (test_type_token(type, token, EVENT_DELIM, next_token)) {
2141 errno = EINVAL;
2142 ret = -1;
2143 free_arg(field);
2144 goto out_free_token;
2145 }
2146
2147 *print_arg = field;
2148
2149 out_free_token:
2150 free_token(token);
2151
2152 return ret;
2153 }
2154
2155 static char *arg_eval (struct print_arg *arg);
2156
2157 static unsigned long long
2158 eval_type_str(unsigned long long val, const char *type, int pointer)
2159 {
2160 int sign = 0;
2161 char *ref;
2162 int len;
2163
2164 len = strlen(type);
2165
2166 if (pointer) {
2167
2168 if (type[len-1] != '*') {
2169 do_warning("pointer expected with non pointer type");
2170 return val;
2171 }
2172
2173 ref = malloc(len);
2174 if (!ref) {
2175 do_warning("%s: not enough memory!", __func__);
2176 return val;
2177 }
2178 memcpy(ref, type, len);
2179
2180 /* chop off the " *" */
2181 ref[len - 2] = 0;
2182
2183 val = eval_type_str(val, ref, 0);
2184 free(ref);
2185 return val;
2186 }
2187
2188 /* check if this is a pointer */
2189 if (type[len - 1] == '*')
2190 return val;
2191
2192 /* Try to figure out the arg size*/
2193 if (strncmp(type, "struct", 6) == 0)
2194 /* all bets off */
2195 return val;
2196
2197 if (strcmp(type, "u8") == 0)
2198 return val & 0xff;
2199
2200 if (strcmp(type, "u16") == 0)
2201 return val & 0xffff;
2202
2203 if (strcmp(type, "u32") == 0)
2204 return val & 0xffffffff;
2205
2206 if (strcmp(type, "u64") == 0 ||
2207 strcmp(type, "s64"))
2208 return val;
2209
2210 if (strcmp(type, "s8") == 0)
2211 return (unsigned long long)(char)val & 0xff;
2212
2213 if (strcmp(type, "s16") == 0)
2214 return (unsigned long long)(short)val & 0xffff;
2215
2216 if (strcmp(type, "s32") == 0)
2217 return (unsigned long long)(int)val & 0xffffffff;
2218
2219 if (strncmp(type, "unsigned ", 9) == 0) {
2220 sign = 0;
2221 type += 9;
2222 }
2223
2224 if (strcmp(type, "char") == 0) {
2225 if (sign)
2226 return (unsigned long long)(char)val & 0xff;
2227 else
2228 return val & 0xff;
2229 }
2230
2231 if (strcmp(type, "short") == 0) {
2232 if (sign)
2233 return (unsigned long long)(short)val & 0xffff;
2234 else
2235 return val & 0xffff;
2236 }
2237
2238 if (strcmp(type, "int") == 0) {
2239 if (sign)
2240 return (unsigned long long)(int)val & 0xffffffff;
2241 else
2242 return val & 0xffffffff;
2243 }
2244
2245 return val;
2246 }
2247
2248 /*
2249 * Try to figure out the type.
2250 */
2251 static unsigned long long
2252 eval_type(unsigned long long val, struct print_arg *arg, int pointer)
2253 {
2254 if (arg->type != PRINT_TYPE) {
2255 do_warning("expected type argument");
2256 return 0;
2257 }
2258
2259 return eval_type_str(val, arg->typecast.type, pointer);
2260 }
2261
2262 static int arg_num_eval(struct print_arg *arg, long long *val)
2263 {
2264 long long left, right;
2265 int ret = 1;
2266
2267 switch (arg->type) {
2268 case PRINT_ATOM:
2269 *val = strtoll(arg->atom.atom, NULL, 0);
2270 break;
2271 case PRINT_TYPE:
2272 ret = arg_num_eval(arg->typecast.item, val);
2273 if (!ret)
2274 break;
2275 *val = eval_type(*val, arg, 0);
2276 break;
2277 case PRINT_OP:
2278 switch (arg->op.op[0]) {
2279 case '|':
2280 ret = arg_num_eval(arg->op.left, &left);
2281 if (!ret)
2282 break;
2283 ret = arg_num_eval(arg->op.right, &right);
2284 if (!ret)
2285 break;
2286 if (arg->op.op[1])
2287 *val = left || right;
2288 else
2289 *val = left | right;
2290 break;
2291 case '&':
2292 ret = arg_num_eval(arg->op.left, &left);
2293 if (!ret)
2294 break;
2295 ret = arg_num_eval(arg->op.right, &right);
2296 if (!ret)
2297 break;
2298 if (arg->op.op[1])
2299 *val = left && right;
2300 else
2301 *val = left & right;
2302 break;
2303 case '<':
2304 ret = arg_num_eval(arg->op.left, &left);
2305 if (!ret)
2306 break;
2307 ret = arg_num_eval(arg->op.right, &right);
2308 if (!ret)
2309 break;
2310 switch (arg->op.op[1]) {
2311 case 0:
2312 *val = left < right;
2313 break;
2314 case '<':
2315 *val = left << right;
2316 break;
2317 case '=':
2318 *val = left <= right;
2319 break;
2320 default:
2321 do_warning("unknown op '%s'", arg->op.op);
2322 ret = 0;
2323 }
2324 break;
2325 case '>':
2326 ret = arg_num_eval(arg->op.left, &left);
2327 if (!ret)
2328 break;
2329 ret = arg_num_eval(arg->op.right, &right);
2330 if (!ret)
2331 break;
2332 switch (arg->op.op[1]) {
2333 case 0:
2334 *val = left > right;
2335 break;
2336 case '>':
2337 *val = left >> right;
2338 break;
2339 case '=':
2340 *val = left >= right;
2341 break;
2342 default:
2343 do_warning("unknown op '%s'", arg->op.op);
2344 ret = 0;
2345 }
2346 break;
2347 case '=':
2348 ret = arg_num_eval(arg->op.left, &left);
2349 if (!ret)
2350 break;
2351 ret = arg_num_eval(arg->op.right, &right);
2352 if (!ret)
2353 break;
2354
2355 if (arg->op.op[1] != '=') {
2356 do_warning("unknown op '%s'", arg->op.op);
2357 ret = 0;
2358 } else
2359 *val = left == right;
2360 break;
2361 case '!':
2362 ret = arg_num_eval(arg->op.left, &left);
2363 if (!ret)
2364 break;
2365 ret = arg_num_eval(arg->op.right, &right);
2366 if (!ret)
2367 break;
2368
2369 switch (arg->op.op[1]) {
2370 case '=':
2371 *val = left != right;
2372 break;
2373 default:
2374 do_warning("unknown op '%s'", arg->op.op);
2375 ret = 0;
2376 }
2377 break;
2378 case '-':
2379 /* check for negative */
2380 if (arg->op.left->type == PRINT_NULL)
2381 left = 0;
2382 else
2383 ret = arg_num_eval(arg->op.left, &left);
2384 if (!ret)
2385 break;
2386 ret = arg_num_eval(arg->op.right, &right);
2387 if (!ret)
2388 break;
2389 *val = left - right;
2390 break;
2391 case '+':
2392 if (arg->op.left->type == PRINT_NULL)
2393 left = 0;
2394 else
2395 ret = arg_num_eval(arg->op.left, &left);
2396 if (!ret)
2397 break;
2398 ret = arg_num_eval(arg->op.right, &right);
2399 if (!ret)
2400 break;
2401 *val = left + right;
2402 break;
2403 case '~':
2404 ret = arg_num_eval(arg->op.right, &right);
2405 if (!ret)
2406 break;
2407 *val = ~right;
2408 break;
2409 default:
2410 do_warning("unknown op '%s'", arg->op.op);
2411 ret = 0;
2412 }
2413 break;
2414
2415 case PRINT_NULL:
2416 case PRINT_FIELD ... PRINT_SYMBOL:
2417 case PRINT_STRING:
2418 case PRINT_BSTRING:
2419 case PRINT_BITMASK:
2420 default:
2421 do_warning("invalid eval type %d", arg->type);
2422 ret = 0;
2423
2424 }
2425 return ret;
2426 }
2427
2428 static char *arg_eval (struct print_arg *arg)
2429 {
2430 long long val;
2431 static char buf[20];
2432
2433 switch (arg->type) {
2434 case PRINT_ATOM:
2435 return arg->atom.atom;
2436 case PRINT_TYPE:
2437 return arg_eval(arg->typecast.item);
2438 case PRINT_OP:
2439 if (!arg_num_eval(arg, &val))
2440 break;
2441 sprintf(buf, "%lld", val);
2442 return buf;
2443
2444 case PRINT_NULL:
2445 case PRINT_FIELD ... PRINT_SYMBOL:
2446 case PRINT_STRING:
2447 case PRINT_BSTRING:
2448 case PRINT_BITMASK:
2449 default:
2450 do_warning("invalid eval type %d", arg->type);
2451 break;
2452 }
2453
2454 return NULL;
2455 }
2456
2457 static enum event_type
2458 process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2459 {
2460 enum event_type type;
2461 struct print_arg *arg = NULL;
2462 struct print_flag_sym *field;
2463 char *token = *tok;
2464 char *value;
2465
2466 do {
2467 free_token(token);
2468 type = read_token_item(&token);
2469 if (test_type_token(type, token, EVENT_OP, "{"))
2470 break;
2471
2472 arg = alloc_arg();
2473 if (!arg)
2474 goto out_free;
2475
2476 free_token(token);
2477 type = process_arg(event, arg, &token);
2478
2479 if (type == EVENT_OP)
2480 type = process_op(event, arg, &token);
2481
2482 if (type == EVENT_ERROR)
2483 goto out_free;
2484
2485 if (test_type_token(type, token, EVENT_DELIM, ","))
2486 goto out_free;
2487
2488 field = calloc(1, sizeof(*field));
2489 if (!field)
2490 goto out_free;
2491
2492 value = arg_eval(arg);
2493 if (value == NULL)
2494 goto out_free_field;
2495 field->value = strdup(value);
2496 if (field->value == NULL)
2497 goto out_free_field;
2498
2499 free_arg(arg);
2500 arg = alloc_arg();
2501 if (!arg)
2502 goto out_free;
2503
2504 free_token(token);
2505 type = process_arg(event, arg, &token);
2506 if (test_type_token(type, token, EVENT_OP, "}"))
2507 goto out_free_field;
2508
2509 value = arg_eval(arg);
2510 if (value == NULL)
2511 goto out_free_field;
2512 field->str = strdup(value);
2513 if (field->str == NULL)
2514 goto out_free_field;
2515 free_arg(arg);
2516 arg = NULL;
2517
2518 *list = field;
2519 list = &field->next;
2520
2521 free_token(token);
2522 type = read_token_item(&token);
2523 } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2524
2525 *tok = token;
2526 return type;
2527
2528 out_free_field:
2529 free_flag_sym(field);
2530 out_free:
2531 free_arg(arg);
2532 free_token(token);
2533 *tok = NULL;
2534
2535 return EVENT_ERROR;
2536 }
2537
2538 static enum event_type
2539 process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2540 {
2541 struct print_arg *field;
2542 enum event_type type;
2543 char *token = NULL;
2544
2545 memset(arg, 0, sizeof(*arg));
2546 arg->type = PRINT_FLAGS;
2547
2548 field = alloc_arg();
2549 if (!field) {
2550 do_warning_event(event, "%s: not enough memory!", __func__);
2551 goto out_free;
2552 }
2553
2554 type = process_field_arg(event, field, &token);
2555
2556 /* Handle operations in the first argument */
2557 while (type == EVENT_OP)
2558 type = process_op(event, field, &token);
2559
2560 if (test_type_token(type, token, EVENT_DELIM, ","))
2561 goto out_free_field;
2562 free_token(token);
2563
2564 arg->flags.field = field;
2565
2566 type = read_token_item(&token);
2567 if (event_item_type(type)) {
2568 arg->flags.delim = token;
2569 type = read_token_item(&token);
2570 }
2571
2572 if (test_type_token(type, token, EVENT_DELIM, ","))
2573 goto out_free;
2574
2575 type = process_fields(event, &arg->flags.flags, &token);
2576 if (test_type_token(type, token, EVENT_DELIM, ")"))
2577 goto out_free;
2578
2579 free_token(token);
2580 type = read_token_item(tok);
2581 return type;
2582
2583 out_free_field:
2584 free_arg(field);
2585 out_free:
2586 free_token(token);
2587 *tok = NULL;
2588 return EVENT_ERROR;
2589 }
2590
2591 static enum event_type
2592 process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2593 {
2594 struct print_arg *field;
2595 enum event_type type;
2596 char *token = NULL;
2597
2598 memset(arg, 0, sizeof(*arg));
2599 arg->type = PRINT_SYMBOL;
2600
2601 field = alloc_arg();
2602 if (!field) {
2603 do_warning_event(event, "%s: not enough memory!", __func__);
2604 goto out_free;
2605 }
2606
2607 type = process_field_arg(event, field, &token);
2608
2609 if (test_type_token(type, token, EVENT_DELIM, ","))
2610 goto out_free_field;
2611
2612 arg->symbol.field = field;
2613
2614 type = process_fields(event, &arg->symbol.symbols, &token);
2615 if (test_type_token(type, token, EVENT_DELIM, ")"))
2616 goto out_free;
2617
2618 free_token(token);
2619 type = read_token_item(tok);
2620 return type;
2621
2622 out_free_field:
2623 free_arg(field);
2624 out_free:
2625 free_token(token);
2626 *tok = NULL;
2627 return EVENT_ERROR;
2628 }
2629
2630 static enum event_type
2631 process_hex(struct event_format *event, struct print_arg *arg, char **tok)
2632 {
2633 memset(arg, 0, sizeof(*arg));
2634 arg->type = PRINT_HEX;
2635
2636 if (alloc_and_process_delim(event, ",", &arg->hex.field))
2637 goto out;
2638
2639 if (alloc_and_process_delim(event, ")", &arg->hex.size))
2640 goto free_field;
2641
2642 return read_token_item(tok);
2643
2644 free_field:
2645 free_arg(arg->hex.field);
2646 arg->hex.field = NULL;
2647 out:
2648 *tok = NULL;
2649 return EVENT_ERROR;
2650 }
2651
2652 static enum event_type
2653 process_int_array(struct event_format *event, struct print_arg *arg, char **tok)
2654 {
2655 memset(arg, 0, sizeof(*arg));
2656 arg->type = PRINT_INT_ARRAY;
2657
2658 if (alloc_and_process_delim(event, ",", &arg->int_array.field))
2659 goto out;
2660
2661 if (alloc_and_process_delim(event, ",", &arg->int_array.count))
2662 goto free_field;
2663
2664 if (alloc_and_process_delim(event, ")", &arg->int_array.el_size))
2665 goto free_size;
2666
2667 return read_token_item(tok);
2668
2669 free_size:
2670 free_arg(arg->int_array.count);
2671 arg->int_array.count = NULL;
2672 free_field:
2673 free_arg(arg->int_array.field);
2674 arg->int_array.field = NULL;
2675 out:
2676 *tok = NULL;
2677 return EVENT_ERROR;
2678 }
2679
2680 static enum event_type
2681 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2682 {
2683 struct format_field *field;
2684 enum event_type type;
2685 char *token;
2686
2687 memset(arg, 0, sizeof(*arg));
2688 arg->type = PRINT_DYNAMIC_ARRAY;
2689
2690 /*
2691 * The item within the parenthesis is another field that holds
2692 * the index into where the array starts.
2693 */
2694 type = read_token(&token);
2695 *tok = token;
2696 if (type != EVENT_ITEM)
2697 goto out_free;
2698
2699 /* Find the field */
2700
2701 field = pevent_find_field(event, token);
2702 if (!field)
2703 goto out_free;
2704
2705 arg->dynarray.field = field;
2706 arg->dynarray.index = 0;
2707
2708 if (read_expected(EVENT_DELIM, ")") < 0)
2709 goto out_free;
2710
2711 free_token(token);
2712 type = read_token_item(&token);
2713 *tok = token;
2714 if (type != EVENT_OP || strcmp(token, "[") != 0)
2715 return type;
2716
2717 free_token(token);
2718 arg = alloc_arg();
2719 if (!arg) {
2720 do_warning_event(event, "%s: not enough memory!", __func__);
2721 *tok = NULL;
2722 return EVENT_ERROR;
2723 }
2724
2725 type = process_arg(event, arg, &token);
2726 if (type == EVENT_ERROR)
2727 goto out_free_arg;
2728
2729 if (!test_type_token(type, token, EVENT_OP, "]"))
2730 goto out_free_arg;
2731
2732 free_token(token);
2733 type = read_token_item(tok);
2734 return type;
2735
2736 out_free_arg:
2737 free_arg(arg);
2738 out_free:
2739 free_token(token);
2740 *tok = NULL;
2741 return EVENT_ERROR;
2742 }
2743
2744 static enum event_type
2745 process_dynamic_array_len(struct event_format *event, struct print_arg *arg,
2746 char **tok)
2747 {
2748 struct format_field *field;
2749 enum event_type type;
2750 char *token;
2751
2752 if (read_expect_type(EVENT_ITEM, &token) < 0)
2753 goto out_free;
2754
2755 arg->type = PRINT_DYNAMIC_ARRAY_LEN;
2756
2757 /* Find the field */
2758 field = pevent_find_field(event, token);
2759 if (!field)
2760 goto out_free;
2761
2762 arg->dynarray.field = field;
2763 arg->dynarray.index = 0;
2764
2765 if (read_expected(EVENT_DELIM, ")") < 0)
2766 goto out_err;
2767
2768 type = read_token(&token);
2769 *tok = token;
2770
2771 return type;
2772
2773 out_free:
2774 free_token(token);
2775 out_err:
2776 *tok = NULL;
2777 return EVENT_ERROR;
2778 }
2779
2780 static enum event_type
2781 process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2782 {
2783 struct print_arg *item_arg;
2784 enum event_type type;
2785 char *token;
2786
2787 type = process_arg(event, arg, &token);
2788
2789 if (type == EVENT_ERROR)
2790 goto out_free;
2791
2792 if (type == EVENT_OP)
2793 type = process_op(event, arg, &token);
2794
2795 if (type == EVENT_ERROR)
2796 goto out_free;
2797
2798 if (test_type_token(type, token, EVENT_DELIM, ")"))
2799 goto out_free;
2800
2801 free_token(token);
2802 type = read_token_item(&token);
2803
2804 /*
2805 * If the next token is an item or another open paren, then
2806 * this was a typecast.
2807 */
2808 if (event_item_type(type) ||
2809 (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2810
2811 /* make this a typecast and contine */
2812
2813 /* prevous must be an atom */
2814 if (arg->type != PRINT_ATOM) {
2815 do_warning_event(event, "previous needed to be PRINT_ATOM");
2816 goto out_free;
2817 }
2818
2819 item_arg = alloc_arg();
2820 if (!item_arg) {
2821 do_warning_event(event, "%s: not enough memory!",
2822 __func__);
2823 goto out_free;
2824 }
2825
2826 arg->type = PRINT_TYPE;
2827 arg->typecast.type = arg->atom.atom;
2828 arg->typecast.item = item_arg;
2829 type = process_arg_token(event, item_arg, &token, type);
2830
2831 }
2832
2833 *tok = token;
2834 return type;
2835
2836 out_free:
2837 free_token(token);
2838 *tok = NULL;
2839 return EVENT_ERROR;
2840 }
2841
2842
2843 static enum event_type
2844 process_str(struct event_format *event __maybe_unused, struct print_arg *arg,
2845 char **tok)
2846 {
2847 enum event_type type;
2848 char *token;
2849
2850 if (read_expect_type(EVENT_ITEM, &token) < 0)
2851 goto out_free;
2852
2853 arg->type = PRINT_STRING;
2854 arg->string.string = token;
2855 arg->string.offset = -1;
2856
2857 if (read_expected(EVENT_DELIM, ")") < 0)
2858 goto out_err;
2859
2860 type = read_token(&token);
2861 *tok = token;
2862
2863 return type;
2864
2865 out_free:
2866 free_token(token);
2867 out_err:
2868 *tok = NULL;
2869 return EVENT_ERROR;
2870 }
2871
2872 static enum event_type
2873 process_bitmask(struct event_format *event __maybe_unused, struct print_arg *arg,
2874 char **tok)
2875 {
2876 enum event_type type;
2877 char *token;
2878
2879 if (read_expect_type(EVENT_ITEM, &token) < 0)
2880 goto out_free;
2881
2882 arg->type = PRINT_BITMASK;
2883 arg->bitmask.bitmask = token;
2884 arg->bitmask.offset = -1;
2885
2886 if (read_expected(EVENT_DELIM, ")") < 0)
2887 goto out_err;
2888
2889 type = read_token(&token);
2890 *tok = token;
2891
2892 return type;
2893
2894 out_free:
2895 free_token(token);
2896 out_err:
2897 *tok = NULL;
2898 return EVENT_ERROR;
2899 }
2900
2901 static struct pevent_function_handler *
2902 find_func_handler(struct pevent *pevent, char *func_name)
2903 {
2904 struct pevent_function_handler *func;
2905
2906 if (!pevent)
2907 return NULL;
2908
2909 for (func = pevent->func_handlers; func; func = func->next) {
2910 if (strcmp(func->name, func_name) == 0)
2911 break;
2912 }
2913
2914 return func;
2915 }
2916
2917 static void remove_func_handler(struct pevent *pevent, char *func_name)
2918 {
2919 struct pevent_function_handler *func;
2920 struct pevent_function_handler **next;
2921
2922 next = &pevent->func_handlers;
2923 while ((func = *next)) {
2924 if (strcmp(func->name, func_name) == 0) {
2925 *next = func->next;
2926 free_func_handle(func);
2927 break;
2928 }
2929 next = &func->next;
2930 }
2931 }
2932
2933 static enum event_type
2934 process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2935 struct print_arg *arg, char **tok)
2936 {
2937 struct print_arg **next_arg;
2938 struct print_arg *farg;
2939 enum event_type type;
2940 char *token;
2941 int i;
2942
2943 arg->type = PRINT_FUNC;
2944 arg->func.func = func;
2945
2946 *tok = NULL;
2947
2948 next_arg = &(arg->func.args);
2949 for (i = 0; i < func->nr_args; i++) {
2950 farg = alloc_arg();
2951 if (!farg) {
2952 do_warning_event(event, "%s: not enough memory!",
2953 __func__);
2954 return EVENT_ERROR;
2955 }
2956
2957 type = process_arg(event, farg, &token);
2958 if (i < (func->nr_args - 1)) {
2959 if (type != EVENT_DELIM || strcmp(token, ",") != 0) {
2960 do_warning_event(event,
2961 "Error: function '%s()' expects %d arguments but event %s only uses %d",
2962 func->name, func->nr_args,
2963 event->name, i + 1);
2964 goto err;
2965 }
2966 } else {
2967 if (type != EVENT_DELIM || strcmp(token, ")") != 0) {
2968 do_warning_event(event,
2969 "Error: function '%s()' only expects %d arguments but event %s has more",
2970 func->name, func->nr_args, event->name);
2971 goto err;
2972 }
2973 }
2974
2975 *next_arg = farg;
2976 next_arg = &(farg->next);
2977 free_token(token);
2978 }
2979
2980 type = read_token(&token);
2981 *tok = token;
2982
2983 return type;
2984
2985 err:
2986 free_arg(farg);
2987 free_token(token);
2988 return EVENT_ERROR;
2989 }
2990
2991 static enum event_type
2992 process_function(struct event_format *event, struct print_arg *arg,
2993 char *token, char **tok)
2994 {
2995 struct pevent_function_handler *func;
2996
2997 if (strcmp(token, "__print_flags") == 0) {
2998 free_token(token);
2999 is_flag_field = 1;
3000 return process_flags(event, arg, tok);
3001 }
3002 if (strcmp(token, "__print_symbolic") == 0) {
3003 free_token(token);
3004 is_symbolic_field = 1;
3005 return process_symbols(event, arg, tok);
3006 }
3007 if (strcmp(token, "__print_hex") == 0) {
3008 free_token(token);
3009 return process_hex(event, arg, tok);
3010 }
3011 if (strcmp(token, "__print_array") == 0) {
3012 free_token(token);
3013 return process_int_array(event, arg, tok);
3014 }
3015 if (strcmp(token, "__get_str") == 0) {
3016 free_token(token);
3017 return process_str(event, arg, tok);
3018 }
3019 if (strcmp(token, "__get_bitmask") == 0) {
3020 free_token(token);
3021 return process_bitmask(event, arg, tok);
3022 }
3023 if (strcmp(token, "__get_dynamic_array") == 0) {
3024 free_token(token);
3025 return process_dynamic_array(event, arg, tok);
3026 }
3027 if (strcmp(token, "__get_dynamic_array_len") == 0) {
3028 free_token(token);
3029 return process_dynamic_array_len(event, arg, tok);
3030 }
3031
3032 func = find_func_handler(event->pevent, token);
3033 if (func) {
3034 free_token(token);
3035 return process_func_handler(event, func, arg, tok);
3036 }
3037
3038 do_warning_event(event, "function %s not defined", token);
3039 free_token(token);
3040 return EVENT_ERROR;
3041 }
3042
3043 static enum event_type
3044 process_arg_token(struct event_format *event, struct print_arg *arg,
3045 char **tok, enum event_type type)
3046 {
3047 char *token;
3048 char *atom;
3049
3050 token = *tok;
3051
3052 switch (type) {
3053 case EVENT_ITEM:
3054 if (strcmp(token, "REC") == 0) {
3055 free_token(token);
3056 type = process_entry(event, arg, &token);
3057 break;
3058 }
3059 atom = token;
3060 /* test the next token */
3061 type = read_token_item(&token);
3062
3063 /*
3064 * If the next token is a parenthesis, then this
3065 * is a function.
3066 */
3067 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
3068 free_token(token);
3069 token = NULL;
3070 /* this will free atom. */
3071 type = process_function(event, arg, atom, &token);
3072 break;
3073 }
3074 /* atoms can be more than one token long */
3075 while (type == EVENT_ITEM) {
3076 char *new_atom;
3077 new_atom = realloc(atom,
3078 strlen(atom) + strlen(token) + 2);
3079 if (!new_atom) {
3080 free(atom);
3081 *tok = NULL;
3082 free_token(token);
3083 return EVENT_ERROR;
3084 }
3085 atom = new_atom;
3086 strcat(atom, " ");
3087 strcat(atom, token);
3088 free_token(token);
3089 type = read_token_item(&token);
3090 }
3091
3092 arg->type = PRINT_ATOM;
3093 arg->atom.atom = atom;
3094 break;
3095
3096 case EVENT_DQUOTE:
3097 case EVENT_SQUOTE:
3098 arg->type = PRINT_ATOM;
3099 arg->atom.atom = token;
3100 type = read_token_item(&token);
3101 break;
3102 case EVENT_DELIM:
3103 if (strcmp(token, "(") == 0) {
3104 free_token(token);
3105 type = process_paren(event, arg, &token);
3106 break;
3107 }
3108 case EVENT_OP:
3109 /* handle single ops */
3110 arg->type = PRINT_OP;
3111 arg->op.op = token;
3112 arg->op.left = NULL;
3113 type = process_op(event, arg, &token);
3114
3115 /* On error, the op is freed */
3116 if (type == EVENT_ERROR)
3117 arg->op.op = NULL;
3118
3119 /* return error type if errored */
3120 break;
3121
3122 case EVENT_ERROR ... EVENT_NEWLINE:
3123 default:
3124 do_warning_event(event, "unexpected type %d", type);
3125 return EVENT_ERROR;
3126 }
3127 *tok = token;
3128
3129 return type;
3130 }
3131
3132 static int event_read_print_args(struct event_format *event, struct print_arg **list)
3133 {
3134 enum event_type type = EVENT_ERROR;
3135 struct print_arg *arg;
3136 char *token;
3137 int args = 0;
3138
3139 do {
3140 if (type == EVENT_NEWLINE) {
3141 type = read_token_item(&token);
3142 continue;
3143 }
3144
3145 arg = alloc_arg();
3146 if (!arg) {
3147 do_warning_event(event, "%s: not enough memory!",
3148 __func__);
3149 return -1;
3150 }
3151
3152 type = process_arg(event, arg, &token);
3153
3154 if (type == EVENT_ERROR) {
3155 free_token(token);
3156 free_arg(arg);
3157 return -1;
3158 }
3159
3160 *list = arg;
3161 args++;
3162
3163 if (type == EVENT_OP) {
3164 type = process_op(event, arg, &token);
3165 free_token(token);
3166 if (type == EVENT_ERROR) {
3167 *list = NULL;
3168 free_arg(arg);
3169 return -1;
3170 }
3171 list = &arg->next;
3172 continue;
3173 }
3174
3175 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
3176 free_token(token);
3177 *list = arg;
3178 list = &arg->next;
3179 continue;
3180 }
3181 break;
3182 } while (type != EVENT_NONE);
3183
3184 if (type != EVENT_NONE && type != EVENT_ERROR)
3185 free_token(token);
3186
3187 return args;
3188 }
3189
3190 static int event_read_print(struct event_format *event)
3191 {
3192 enum event_type type;
3193 char *token;
3194 int ret;
3195
3196 if (read_expected_item(EVENT_ITEM, "print") < 0)
3197 return -1;
3198
3199 if (read_expected(EVENT_ITEM, "fmt") < 0)
3200 return -1;
3201
3202 if (read_expected(EVENT_OP, ":") < 0)
3203 return -1;
3204
3205 if (read_expect_type(EVENT_DQUOTE, &token) < 0)
3206 goto fail;
3207
3208 concat:
3209 event->print_fmt.format = token;
3210 event->print_fmt.args = NULL;
3211
3212 /* ok to have no arg */
3213 type = read_token_item(&token);
3214
3215 if (type == EVENT_NONE)
3216 return 0;
3217
3218 /* Handle concatenation of print lines */
3219 if (type == EVENT_DQUOTE) {
3220 char *cat;
3221
3222 if (asprintf(&cat, "%s%s", event->print_fmt.format, token) < 0)
3223 goto fail;
3224 free_token(token);
3225 free_token(event->print_fmt.format);
3226 event->print_fmt.format = NULL;
3227 token = cat;
3228 goto concat;
3229 }
3230
3231 if (test_type_token(type, token, EVENT_DELIM, ","))
3232 goto fail;
3233
3234 free_token(token);
3235
3236 ret = event_read_print_args(event, &event->print_fmt.args);
3237 if (ret < 0)
3238 return -1;
3239
3240 return ret;
3241
3242 fail:
3243 free_token(token);
3244 return -1;
3245 }
3246
3247 /**
3248 * pevent_find_common_field - return a common field by event
3249 * @event: handle for the event
3250 * @name: the name of the common field to return
3251 *
3252 * Returns a common field from the event by the given @name.
3253 * This only searchs the common fields and not all field.
3254 */
3255 struct format_field *
3256 pevent_find_common_field(struct event_format *event, const char *name)
3257 {
3258 struct format_field *format;
3259
3260 for (format = event->format.common_fields;
3261 format; format = format->next) {
3262 if (strcmp(format->name, name) == 0)
3263 break;
3264 }
3265
3266 return format;
3267 }
3268
3269 /**
3270 * pevent_find_field - find a non-common field
3271 * @event: handle for the event
3272 * @name: the name of the non-common field
3273 *
3274 * Returns a non-common field by the given @name.
3275 * This does not search common fields.
3276 */
3277 struct format_field *
3278 pevent_find_field(struct event_format *event, const char *name)
3279 {
3280 struct format_field *format;
3281
3282 for (format = event->format.fields;
3283 format; format = format->next) {
3284 if (strcmp(format->name, name) == 0)
3285 break;
3286 }
3287
3288 return format;
3289 }
3290
3291 /**
3292 * pevent_find_any_field - find any field by name
3293 * @event: handle for the event
3294 * @name: the name of the field
3295 *
3296 * Returns a field by the given @name.
3297 * This searchs the common field names first, then
3298 * the non-common ones if a common one was not found.
3299 */
3300 struct format_field *
3301 pevent_find_any_field(struct event_format *event, const char *name)
3302 {
3303 struct format_field *format;
3304
3305 format = pevent_find_common_field(event, name);
3306 if (format)
3307 return format;
3308 return pevent_find_field(event, name);
3309 }
3310
3311 /**
3312 * pevent_read_number - read a number from data
3313 * @pevent: handle for the pevent
3314 * @ptr: the raw data
3315 * @size: the size of the data that holds the number
3316 *
3317 * Returns the number (converted to host) from the
3318 * raw data.
3319 */
3320 unsigned long long pevent_read_number(struct pevent *pevent,
3321 const void *ptr, int size)
3322 {
3323 switch (size) {
3324 case 1:
3325 return *(unsigned char *)ptr;
3326 case 2:
3327 return data2host2(pevent, ptr);
3328 case 4:
3329 return data2host4(pevent, ptr);
3330 case 8:
3331 return data2host8(pevent, ptr);
3332 default:
3333 /* BUG! */
3334 return 0;
3335 }
3336 }
3337
3338 /**
3339 * pevent_read_number_field - read a number from data
3340 * @field: a handle to the field
3341 * @data: the raw data to read
3342 * @value: the value to place the number in
3343 *
3344 * Reads raw data according to a field offset and size,
3345 * and translates it into @value.
3346 *
3347 * Returns 0 on success, -1 otherwise.
3348 */
3349 int pevent_read_number_field(struct format_field *field, const void *data,
3350 unsigned long long *value)
3351 {
3352 if (!field)
3353 return -1;
3354 switch (field->size) {
3355 case 1:
3356 case 2:
3357 case 4:
3358 case 8:
3359 *value = pevent_read_number(field->event->pevent,
3360 data + field->offset, field->size);
3361 return 0;
3362 default:
3363 return -1;
3364 }
3365 }
3366
3367 static int get_common_info(struct pevent *pevent,
3368 const char *type, int *offset, int *size)
3369 {
3370 struct event_format *event;
3371 struct format_field *field;
3372
3373 /*
3374 * All events should have the same common elements.
3375 * Pick any event to find where the type is;
3376 */
3377 if (!pevent->events) {
3378 do_warning("no event_list!");
3379 return -1;
3380 }
3381
3382 event = pevent->events[0];
3383 field = pevent_find_common_field(event, type);
3384 if (!field)
3385 return -1;
3386
3387 *offset = field->offset;
3388 *size = field->size;
3389
3390 return 0;
3391 }
3392
3393 static int __parse_common(struct pevent *pevent, void *data,
3394 int *size, int *offset, const char *name)
3395 {
3396 int ret;
3397
3398 if (!*size) {
3399 ret = get_common_info(pevent, name, offset, size);
3400 if (ret < 0)
3401 return ret;
3402 }
3403 return pevent_read_number(pevent, data + *offset, *size);
3404 }
3405
3406 static int trace_parse_common_type(struct pevent *pevent, void *data)
3407 {
3408 return __parse_common(pevent, data,
3409 &pevent->type_size, &pevent->type_offset,
3410 "common_type");
3411 }
3412
3413 static int parse_common_pid(struct pevent *pevent, void *data)
3414 {
3415 return __parse_common(pevent, data,
3416 &pevent->pid_size, &pevent->pid_offset,
3417 "common_pid");
3418 }
3419
3420 static int parse_common_pc(struct pevent *pevent, void *data)
3421 {
3422 return __parse_common(pevent, data,
3423 &pevent->pc_size, &pevent->pc_offset,
3424 "common_preempt_count");
3425 }
3426
3427 static int parse_common_flags(struct pevent *pevent, void *data)
3428 {
3429 return __parse_common(pevent, data,
3430 &pevent->flags_size, &pevent->flags_offset,
3431 "common_flags");
3432 }
3433
3434 static int parse_common_lock_depth(struct pevent *pevent, void *data)
3435 {
3436 return __parse_common(pevent, data,
3437 &pevent->ld_size, &pevent->ld_offset,
3438 "common_lock_depth");
3439 }
3440
3441 static int parse_common_migrate_disable(struct pevent *pevent, void *data)
3442 {
3443 return __parse_common(pevent, data,
3444 &pevent->ld_size, &pevent->ld_offset,
3445 "common_migrate_disable");
3446 }
3447
3448 static int events_id_cmp(const void *a, const void *b);
3449
3450 /**
3451 * pevent_find_event - find an event by given id
3452 * @pevent: a handle to the pevent
3453 * @id: the id of the event
3454 *
3455 * Returns an event that has a given @id.
3456 */
3457 struct event_format *pevent_find_event(struct pevent *pevent, int id)
3458 {
3459 struct event_format **eventptr;
3460 struct event_format key;
3461 struct event_format *pkey = &key;
3462
3463 /* Check cache first */
3464 if (pevent->last_event && pevent->last_event->id == id)
3465 return pevent->last_event;
3466
3467 key.id = id;
3468
3469 eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
3470 sizeof(*pevent->events), events_id_cmp);
3471
3472 if (eventptr) {
3473 pevent->last_event = *eventptr;
3474 return *eventptr;
3475 }
3476
3477 return NULL;
3478 }
3479
3480 /**
3481 * pevent_find_event_by_name - find an event by given name
3482 * @pevent: a handle to the pevent
3483 * @sys: the system name to search for
3484 * @name: the name of the event to search for
3485 *
3486 * This returns an event with a given @name and under the system
3487 * @sys. If @sys is NULL the first event with @name is returned.
3488 */
3489 struct event_format *
3490 pevent_find_event_by_name(struct pevent *pevent,
3491 const char *sys, const char *name)
3492 {
3493 struct event_format *event;
3494 int i;
3495
3496 if (pevent->last_event &&
3497 strcmp(pevent->last_event->name, name) == 0 &&
3498 (!sys || strcmp(pevent->last_event->system, sys) == 0))
3499 return pevent->last_event;
3500
3501 for (i = 0; i < pevent->nr_events; i++) {
3502 event = pevent->events[i];
3503 if (strcmp(event->name, name) == 0) {
3504 if (!sys)
3505 break;
3506 if (strcmp(event->system, sys) == 0)
3507 break;
3508 }
3509 }
3510 if (i == pevent->nr_events)
3511 event = NULL;
3512
3513 pevent->last_event = event;
3514 return event;
3515 }
3516
3517 static unsigned long long
3518 eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
3519 {
3520 struct pevent *pevent = event->pevent;
3521 unsigned long long val = 0;
3522 unsigned long long left, right;
3523 struct print_arg *typearg = NULL;
3524 struct print_arg *larg;
3525 unsigned long offset;
3526 unsigned int field_size;
3527
3528 switch (arg->type) {
3529 case PRINT_NULL:
3530 /* ?? */
3531 return 0;
3532 case PRINT_ATOM:
3533 return strtoull(arg->atom.atom, NULL, 0);
3534 case PRINT_FIELD:
3535 if (!arg->field.field) {
3536 arg->field.field = pevent_find_any_field(event, arg->field.name);
3537 if (!arg->field.field)
3538 goto out_warning_field;
3539
3540 }
3541 /* must be a number */
3542 val = pevent_read_number(pevent, data + arg->field.field->offset,
3543 arg->field.field->size);
3544 break;
3545 case PRINT_FLAGS:
3546 case PRINT_SYMBOL:
3547 case PRINT_INT_ARRAY:
3548 case PRINT_HEX:
3549 break;
3550 case PRINT_TYPE:
3551 val = eval_num_arg(data, size, event, arg->typecast.item);
3552 return eval_type(val, arg, 0);
3553 case PRINT_STRING:
3554 case PRINT_BSTRING:
3555 case PRINT_BITMASK:
3556 return 0;
3557 case PRINT_FUNC: {
3558 struct trace_seq s;
3559 trace_seq_init(&s);
3560 val = process_defined_func(&s, data, size, event, arg);
3561 trace_seq_destroy(&s);
3562 return val;
3563 }
3564 case PRINT_OP:
3565 if (strcmp(arg->op.op, "[") == 0) {
3566 /*
3567 * Arrays are special, since we don't want
3568 * to read the arg as is.
3569 */
3570 right = eval_num_arg(data, size, event, arg->op.right);
3571
3572 /* handle typecasts */
3573 larg = arg->op.left;
3574 while (larg->type == PRINT_TYPE) {
3575 if (!typearg)
3576 typearg = larg;
3577 larg = larg->typecast.item;
3578 }
3579
3580 /* Default to long size */
3581 field_size = pevent->long_size;
3582
3583 switch (larg->type) {
3584 case PRINT_DYNAMIC_ARRAY:
3585 offset = pevent_read_number(pevent,
3586 data + larg->dynarray.field->offset,
3587 larg->dynarray.field->size);
3588 if (larg->dynarray.field->elementsize)
3589 field_size = larg->dynarray.field->elementsize;
3590 /*
3591 * The actual length of the dynamic array is stored
3592 * in the top half of the field, and the offset
3593 * is in the bottom half of the 32 bit field.
3594 */
3595 offset &= 0xffff;
3596 offset += right;
3597 break;
3598 case PRINT_FIELD:
3599 if (!larg->field.field) {
3600 larg->field.field =
3601 pevent_find_any_field(event, larg->field.name);
3602 if (!larg->field.field) {
3603 arg = larg;
3604 goto out_warning_field;
3605 }
3606 }
3607 field_size = larg->field.field->elementsize;
3608 offset = larg->field.field->offset +
3609 right * larg->field.field->elementsize;
3610 break;
3611 default:
3612 goto default_op; /* oops, all bets off */
3613 }
3614 val = pevent_read_number(pevent,
3615 data + offset, field_size);
3616 if (typearg)
3617 val = eval_type(val, typearg, 1);
3618 break;
3619 } else if (strcmp(arg->op.op, "?") == 0) {
3620 left = eval_num_arg(data, size, event, arg->op.left);
3621 arg = arg->op.right;
3622 if (left)
3623 val = eval_num_arg(data, size, event, arg->op.left);
3624 else
3625 val = eval_num_arg(data, size, event, arg->op.right);
3626 break;
3627 }
3628 default_op:
3629 left = eval_num_arg(data, size, event, arg->op.left);
3630 right = eval_num_arg(data, size, event, arg->op.right);
3631 switch (arg->op.op[0]) {
3632 case '!':
3633 switch (arg->op.op[1]) {
3634 case 0:
3635 val = !right;
3636 break;
3637 case '=':
3638 val = left != right;
3639 break;
3640 default:
3641 goto out_warning_op;
3642 }
3643 break;
3644 case '~':
3645 val = ~right;
3646 break;
3647 case '|':
3648 if (arg->op.op[1])
3649 val = left || right;
3650 else
3651 val = left | right;
3652 break;
3653 case '&':
3654 if (arg->op.op[1])
3655 val = left && right;
3656 else
3657 val = left & right;
3658 break;
3659 case '<':
3660 switch (arg->op.op[1]) {
3661 case 0:
3662 val = left < right;
3663 break;
3664 case '<':
3665 val = left << right;
3666 break;
3667 case '=':
3668 val = left <= right;
3669 break;
3670 default:
3671 goto out_warning_op;
3672 }
3673 break;
3674 case '>':
3675 switch (arg->op.op[1]) {
3676 case 0:
3677 val = left > right;
3678 break;
3679 case '>':
3680 val = left >> right;
3681 break;
3682 case '=':
3683 val = left >= right;
3684 break;
3685 default:
3686 goto out_warning_op;
3687 }
3688 break;
3689 case '=':
3690 if (arg->op.op[1] != '=')
3691 goto out_warning_op;
3692
3693 val = left == right;
3694 break;
3695 case '-':
3696 val = left - right;
3697 break;
3698 case '+':
3699 val = left + right;
3700 break;
3701 case '/':
3702 val = left / right;
3703 break;
3704 case '%':
3705 val = left % right;
3706 break;
3707 case '*':
3708 val = left * right;
3709 break;
3710 default:
3711 goto out_warning_op;
3712 }
3713 break;
3714 case PRINT_DYNAMIC_ARRAY_LEN:
3715 offset = pevent_read_number(pevent,
3716 data + arg->dynarray.field->offset,
3717 arg->dynarray.field->size);
3718 /*
3719 * The total allocated length of the dynamic array is
3720 * stored in the top half of the field, and the offset
3721 * is in the bottom half of the 32 bit field.
3722 */
3723 val = (unsigned long long)(offset >> 16);
3724 break;
3725 case PRINT_DYNAMIC_ARRAY:
3726 /* Without [], we pass the address to the dynamic data */
3727 offset = pevent_read_number(pevent,
3728 data + arg->dynarray.field->offset,
3729 arg->dynarray.field->size);
3730 /*
3731 * The total allocated length of the dynamic array is
3732 * stored in the top half of the field, and the offset
3733 * is in the bottom half of the 32 bit field.
3734 */
3735 offset &= 0xffff;
3736 val = (unsigned long long)((unsigned long)data + offset);
3737 break;
3738 default: /* not sure what to do there */
3739 return 0;
3740 }
3741 return val;
3742
3743 out_warning_op:
3744 do_warning_event(event, "%s: unknown op '%s'", __func__, arg->op.op);
3745 return 0;
3746
3747 out_warning_field:
3748 do_warning_event(event, "%s: field %s not found",
3749 __func__, arg->field.name);
3750 return 0;
3751 }
3752
3753 struct flag {
3754 const char *name;
3755 unsigned long long value;
3756 };
3757
3758 static const struct flag flags[] = {
3759 { "HI_SOFTIRQ", 0 },
3760 { "TIMER_SOFTIRQ", 1 },
3761 { "NET_TX_SOFTIRQ", 2 },
3762 { "NET_RX_SOFTIRQ", 3 },
3763 { "BLOCK_SOFTIRQ", 4 },
3764 { "IRQ_POLL_SOFTIRQ", 5 },
3765 { "TASKLET_SOFTIRQ", 6 },
3766 { "SCHED_SOFTIRQ", 7 },
3767 { "HRTIMER_SOFTIRQ", 8 },
3768 { "RCU_SOFTIRQ", 9 },
3769
3770 { "HRTIMER_NORESTART", 0 },
3771 { "HRTIMER_RESTART", 1 },
3772 };
3773
3774 static long long eval_flag(const char *flag)
3775 {
3776 int i;
3777
3778 /*
3779 * Some flags in the format files do not get converted.
3780 * If the flag is not numeric, see if it is something that
3781 * we already know about.
3782 */
3783 if (isdigit(flag[0]))
3784 return strtoull(flag, NULL, 0);
3785
3786 for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3787 if (strcmp(flags[i].name, flag) == 0)
3788 return flags[i].value;
3789
3790 return -1LL;
3791 }
3792
3793 static void print_str_to_seq(struct trace_seq *s, const char *format,
3794 int len_arg, const char *str)
3795 {
3796 if (len_arg >= 0)
3797 trace_seq_printf(s, format, len_arg, str);
3798 else
3799 trace_seq_printf(s, format, str);
3800 }
3801
3802 static void print_bitmask_to_seq(struct pevent *pevent,
3803 struct trace_seq *s, const char *format,
3804 int len_arg, const void *data, int size)
3805 {
3806 int nr_bits = size * 8;
3807 int str_size = (nr_bits + 3) / 4;
3808 int len = 0;
3809 char buf[3];
3810 char *str;
3811 int index;
3812 int i;
3813
3814 /*
3815 * The kernel likes to put in commas every 32 bits, we
3816 * can do the same.
3817 */
3818 str_size += (nr_bits - 1) / 32;
3819
3820 str = malloc(str_size + 1);
3821 if (!str) {
3822 do_warning("%s: not enough memory!", __func__);
3823 return;
3824 }
3825 str[str_size] = 0;
3826
3827 /* Start out with -2 for the two chars per byte */
3828 for (i = str_size - 2; i >= 0; i -= 2) {
3829 /*
3830 * data points to a bit mask of size bytes.
3831 * In the kernel, this is an array of long words, thus
3832 * endianess is very important.
3833 */
3834 if (pevent->file_bigendian)
3835 index = size - (len + 1);
3836 else
3837 index = len;
3838
3839 snprintf(buf, 3, "%02x", *((unsigned char *)data + index));
3840 memcpy(str + i, buf, 2);
3841 len++;
3842 if (!(len & 3) && i > 0) {
3843 i--;
3844 str[i] = ',';
3845 }
3846 }
3847
3848 if (len_arg >= 0)
3849 trace_seq_printf(s, format, len_arg, str);
3850 else
3851 trace_seq_printf(s, format, str);
3852
3853 free(str);
3854 }
3855
3856 static void print_str_arg(struct trace_seq *s, void *data, int size,
3857 struct event_format *event, const char *format,
3858 int len_arg, struct print_arg *arg)
3859 {
3860 struct pevent *pevent = event->pevent;
3861 struct print_flag_sym *flag;
3862 struct format_field *field;
3863 struct printk_map *printk;
3864 long long val, fval;
3865 unsigned long long addr;
3866 char *str;
3867 unsigned char *hex;
3868 int print;
3869 int i, len;
3870
3871 switch (arg->type) {
3872 case PRINT_NULL:
3873 /* ?? */
3874 return;
3875 case PRINT_ATOM:
3876 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3877 return;
3878 case PRINT_FIELD:
3879 field = arg->field.field;
3880 if (!field) {
3881 field = pevent_find_any_field(event, arg->field.name);
3882 if (!field) {
3883 str = arg->field.name;
3884 goto out_warning_field;
3885 }
3886 arg->field.field = field;
3887 }
3888 /* Zero sized fields, mean the rest of the data */
3889 len = field->size ? : size - field->offset;
3890
3891 /*
3892 * Some events pass in pointers. If this is not an array
3893 * and the size is the same as long_size, assume that it
3894 * is a pointer.
3895 */
3896 if (!(field->flags & FIELD_IS_ARRAY) &&
3897 field->size == pevent->long_size) {
3898
3899 /* Handle heterogeneous recording and processing
3900 * architectures
3901 *
3902 * CASE I:
3903 * Traces recorded on 32-bit devices (32-bit
3904 * addressing) and processed on 64-bit devices:
3905 * In this case, only 32 bits should be read.
3906 *
3907 * CASE II:
3908 * Traces recorded on 64 bit devices and processed
3909 * on 32-bit devices:
3910 * In this case, 64 bits must be read.
3911 */
3912 addr = (pevent->long_size == 8) ?
3913 *(unsigned long long *)(data + field->offset) :
3914 (unsigned long long)*(unsigned int *)(data + field->offset);
3915
3916 /* Check if it matches a print format */
3917 printk = find_printk(pevent, addr);
3918 if (printk)
3919 trace_seq_puts(s, printk->printk);
3920 else
3921 trace_seq_printf(s, "%llx", addr);
3922 break;
3923 }
3924 str = malloc(len + 1);
3925 if (!str) {
3926 do_warning_event(event, "%s: not enough memory!",
3927 __func__);
3928 return;
3929 }
3930 memcpy(str, data + field->offset, len);
3931 str[len] = 0;
3932 print_str_to_seq(s, format, len_arg, str);
3933 free(str);
3934 break;
3935 case PRINT_FLAGS:
3936 val = eval_num_arg(data, size, event, arg->flags.field);
3937 print = 0;
3938 for (flag = arg->flags.flags; flag; flag = flag->next) {
3939 fval = eval_flag(flag->value);
3940 if (!val && fval < 0) {
3941 print_str_to_seq(s, format, len_arg, flag->str);
3942 break;
3943 }
3944 if (fval > 0 && (val & fval) == fval) {
3945 if (print && arg->flags.delim)
3946 trace_seq_puts(s, arg->flags.delim);
3947 print_str_to_seq(s, format, len_arg, flag->str);
3948 print = 1;
3949 val &= ~fval;
3950 }
3951 }
3952 break;
3953 case PRINT_SYMBOL:
3954 val = eval_num_arg(data, size, event, arg->symbol.field);
3955 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3956 fval = eval_flag(flag->value);
3957 if (val == fval) {
3958 print_str_to_seq(s, format, len_arg, flag->str);
3959 break;
3960 }
3961 }
3962 break;
3963 case PRINT_HEX:
3964 if (arg->hex.field->type == PRINT_DYNAMIC_ARRAY) {
3965 unsigned long offset;
3966 offset = pevent_read_number(pevent,
3967 data + arg->hex.field->dynarray.field->offset,
3968 arg->hex.field->dynarray.field->size);
3969 hex = data + (offset & 0xffff);
3970 } else {
3971 field = arg->hex.field->field.field;
3972 if (!field) {
3973 str = arg->hex.field->field.name;
3974 field = pevent_find_any_field(event, str);
3975 if (!field)
3976 goto out_warning_field;
3977 arg->hex.field->field.field = field;
3978 }
3979 hex = data + field->offset;
3980 }
3981 len = eval_num_arg(data, size, event, arg->hex.size);
3982 for (i = 0; i < len; i++) {
3983 if (i)
3984 trace_seq_putc(s, ' ');
3985 trace_seq_printf(s, "%02x", hex[i]);
3986 }
3987 break;
3988
3989 case PRINT_INT_ARRAY: {
3990 void *num;
3991 int el_size;
3992
3993 if (arg->int_array.field->type == PRINT_DYNAMIC_ARRAY) {
3994 unsigned long offset;
3995 struct format_field *field =
3996 arg->int_array.field->dynarray.field;
3997 offset = pevent_read_number(pevent,
3998 data + field->offset,
3999 field->size);
4000 num = data + (offset & 0xffff);
4001 } else {
4002 field = arg->int_array.field->field.field;
4003 if (!field) {
4004 str = arg->int_array.field->field.name;
4005 field = pevent_find_any_field(event, str);
4006 if (!field)
4007 goto out_warning_field;
4008 arg->int_array.field->field.field = field;
4009 }
4010 num = data + field->offset;
4011 }
4012 len = eval_num_arg(data, size, event, arg->int_array.count);
4013 el_size = eval_num_arg(data, size, event,
4014 arg->int_array.el_size);
4015 for (i = 0; i < len; i++) {
4016 if (i)
4017 trace_seq_putc(s, ' ');
4018
4019 if (el_size == 1) {
4020 trace_seq_printf(s, "%u", *(uint8_t *)num);
4021 } else if (el_size == 2) {
4022 trace_seq_printf(s, "%u", *(uint16_t *)num);
4023 } else if (el_size == 4) {
4024 trace_seq_printf(s, "%u", *(uint32_t *)num);
4025 } else if (el_size == 8) {
4026 trace_seq_printf(s, "%"PRIu64, *(uint64_t *)num);
4027 } else {
4028 trace_seq_printf(s, "BAD SIZE:%d 0x%x",
4029 el_size, *(uint8_t *)num);
4030 el_size = 1;
4031 }
4032
4033 num += el_size;
4034 }
4035 break;
4036 }
4037 case PRINT_TYPE:
4038 break;
4039 case PRINT_STRING: {
4040 int str_offset;
4041
4042 if (arg->string.offset == -1) {
4043 struct format_field *f;
4044
4045 f = pevent_find_any_field(event, arg->string.string);
4046 arg->string.offset = f->offset;
4047 }
4048 str_offset = data2host4(pevent, data + arg->string.offset);
4049 str_offset &= 0xffff;
4050 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
4051 break;
4052 }
4053 case PRINT_BSTRING:
4054 print_str_to_seq(s, format, len_arg, arg->string.string);
4055 break;
4056 case PRINT_BITMASK: {
4057 int bitmask_offset;
4058 int bitmask_size;
4059
4060 if (arg->bitmask.offset == -1) {
4061 struct format_field *f;
4062
4063 f = pevent_find_any_field(event, arg->bitmask.bitmask);
4064 arg->bitmask.offset = f->offset;
4065 }
4066 bitmask_offset = data2host4(pevent, data + arg->bitmask.offset);
4067 bitmask_size = bitmask_offset >> 16;
4068 bitmask_offset &= 0xffff;
4069 print_bitmask_to_seq(pevent, s, format, len_arg,
4070 data + bitmask_offset, bitmask_size);
4071 break;
4072 }
4073 case PRINT_OP:
4074 /*
4075 * The only op for string should be ? :
4076 */
4077 if (arg->op.op[0] != '?')
4078 return;
4079 val = eval_num_arg(data, size, event, arg->op.left);
4080 if (val)
4081 print_str_arg(s, data, size, event,
4082 format, len_arg, arg->op.right->op.left);
4083 else
4084 print_str_arg(s, data, size, event,
4085 format, len_arg, arg->op.right->op.right);
4086 break;
4087 case PRINT_FUNC:
4088 process_defined_func(s, data, size, event, arg);
4089 break;
4090 default:
4091 /* well... */
4092 break;
4093 }
4094
4095 return;
4096
4097 out_warning_field:
4098 do_warning_event(event, "%s: field %s not found",
4099 __func__, arg->field.name);
4100 }
4101
4102 static unsigned long long
4103 process_defined_func(struct trace_seq *s, void *data, int size,
4104 struct event_format *event, struct print_arg *arg)
4105 {
4106 struct pevent_function_handler *func_handle = arg->func.func;
4107 struct pevent_func_params *param;
4108 unsigned long long *args;
4109 unsigned long long ret;
4110 struct print_arg *farg;
4111 struct trace_seq str;
4112 struct save_str {
4113 struct save_str *next;
4114 char *str;
4115 } *strings = NULL, *string;
4116 int i;
4117
4118 if (!func_handle->nr_args) {
4119 ret = (*func_handle->func)(s, NULL);
4120 goto out;
4121 }
4122
4123 farg = arg->func.args;
4124 param = func_handle->params;
4125
4126 ret = ULLONG_MAX;
4127 args = malloc(sizeof(*args) * func_handle->nr_args);
4128 if (!args)
4129 goto out;
4130
4131 for (i = 0; i < func_handle->nr_args; i++) {
4132 switch (param->type) {
4133 case PEVENT_FUNC_ARG_INT:
4134 case PEVENT_FUNC_ARG_LONG:
4135 case PEVENT_FUNC_ARG_PTR:
4136 args[i] = eval_num_arg(data, size, event, farg);
4137 break;
4138 case PEVENT_FUNC_ARG_STRING:
4139 trace_seq_init(&str);
4140 print_str_arg(&str, data, size, event, "%s", -1, farg);
4141 trace_seq_terminate(&str);
4142 string = malloc(sizeof(*string));
4143 if (!string) {
4144 do_warning_event(event, "%s(%d): malloc str",
4145 __func__, __LINE__);
4146 goto out_free;
4147 }
4148 string->next = strings;
4149 string->str = strdup(str.buffer);
4150 if (!string->str) {
4151 free(string);
4152 do_warning_event(event, "%s(%d): malloc str",
4153 __func__, __LINE__);
4154 goto out_free;
4155 }
4156 args[i] = (uintptr_t)string->str;
4157 strings = string;
4158 trace_seq_destroy(&str);
4159 break;
4160 default:
4161 /*
4162 * Something went totally wrong, this is not
4163 * an input error, something in this code broke.
4164 */
4165 do_warning_event(event, "Unexpected end of arguments\n");
4166 goto out_free;
4167 }
4168 farg = farg->next;
4169 param = param->next;
4170 }
4171
4172 ret = (*func_handle->func)(s, args);
4173 out_free:
4174 free(args);
4175 while (strings) {
4176 string = strings;
4177 strings = string->next;
4178 free(string->str);
4179 free(string);
4180 }
4181
4182 out:
4183 /* TBD : handle return type here */
4184 return ret;
4185 }
4186
4187 static void free_args(struct print_arg *args)
4188 {
4189 struct print_arg *next;
4190
4191 while (args) {
4192 next = args->next;
4193
4194 free_arg(args);
4195 args = next;
4196 }
4197 }
4198
4199 static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
4200 {
4201 struct pevent *pevent = event->pevent;
4202 struct format_field *field, *ip_field;
4203 struct print_arg *args, *arg, **next;
4204 unsigned long long ip, val;
4205 char *ptr;
4206 void *bptr;
4207 int vsize;
4208
4209 field = pevent->bprint_buf_field;
4210 ip_field = pevent->bprint_ip_field;
4211
4212 if (!field) {
4213 field = pevent_find_field(event, "buf");
4214 if (!field) {
4215 do_warning_event(event, "can't find buffer field for binary printk");
4216 return NULL;
4217 }
4218 ip_field = pevent_find_field(event, "ip");
4219 if (!ip_field) {
4220 do_warning_event(event, "can't find ip field for binary printk");
4221 return NULL;
4222 }
4223 pevent->bprint_buf_field = field;
4224 pevent->bprint_ip_field = ip_field;
4225 }
4226
4227 ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
4228
4229 /*
4230 * The first arg is the IP pointer.
4231 */
4232 args = alloc_arg();
4233 if (!args) {
4234 do_warning_event(event, "%s(%d): not enough memory!",
4235 __func__, __LINE__);
4236 return NULL;
4237 }
4238 arg = args;
4239 arg->next = NULL;
4240 next = &arg->next;
4241
4242 arg->type = PRINT_ATOM;
4243
4244 if (asprintf(&arg->atom.atom, "%lld", ip) < 0)
4245 goto out_free;
4246
4247 /* skip the first "%ps: " */
4248 for (ptr = fmt + 5, bptr = data + field->offset;
4249 bptr < data + size && *ptr; ptr++) {
4250 int ls = 0;
4251
4252 if (*ptr == '%') {
4253 process_again:
4254 ptr++;
4255 switch (*ptr) {
4256 case '%':
4257 break;
4258 case 'l':
4259 ls++;
4260 goto process_again;
4261 case 'L':
4262 ls = 2;
4263 goto process_again;
4264 case '0' ... '9':
4265 goto process_again;
4266 case '.':
4267 goto process_again;
4268 case 'z':
4269 case 'Z':
4270 ls = 1;
4271 goto process_again;
4272 case 'p':
4273 ls = 1;
4274 /* fall through */
4275 case 'd':
4276 case 'u':
4277 case 'x':
4278 case 'i':
4279 switch (ls) {
4280 case 0:
4281 vsize = 4;
4282 break;
4283 case 1:
4284 vsize = pevent->long_size;
4285 break;
4286 case 2:
4287 vsize = 8;
4288 break;
4289 default:
4290 vsize = ls; /* ? */
4291 break;
4292 }
4293 /* fall through */
4294 case '*':
4295 if (*ptr == '*')
4296 vsize = 4;
4297
4298 /* the pointers are always 4 bytes aligned */
4299 bptr = (void *)(((unsigned long)bptr + 3) &
4300 ~3);
4301 val = pevent_read_number(pevent, bptr, vsize);
4302 bptr += vsize;
4303 arg = alloc_arg();
4304 if (!arg) {
4305 do_warning_event(event, "%s(%d): not enough memory!",
4306 __func__, __LINE__);
4307 goto out_free;
4308 }
4309 arg->next = NULL;
4310 arg->type = PRINT_ATOM;
4311 if (asprintf(&arg->atom.atom, "%lld", val) < 0) {
4312 free(arg);
4313 goto out_free;
4314 }
4315 *next = arg;
4316 next = &arg->next;
4317 /*
4318 * The '*' case means that an arg is used as the length.
4319 * We need to continue to figure out for what.
4320 */
4321 if (*ptr == '*')
4322 goto process_again;
4323
4324 break;
4325 case 's':
4326 arg = alloc_arg();
4327 if (!arg) {
4328 do_warning_event(event, "%s(%d): not enough memory!",
4329 __func__, __LINE__);
4330 goto out_free;
4331 }
4332 arg->next = NULL;
4333 arg->type = PRINT_BSTRING;
4334 arg->string.string = strdup(bptr);
4335 if (!arg->string.string)
4336 goto out_free;
4337 bptr += strlen(bptr) + 1;
4338 *next = arg;
4339 next = &arg->next;
4340 default:
4341 break;
4342 }
4343 }
4344 }
4345
4346 return args;
4347
4348 out_free:
4349 free_args(args);
4350 return NULL;
4351 }
4352
4353 static char *
4354 get_bprint_format(void *data, int size __maybe_unused,
4355 struct event_format *event)
4356 {
4357 struct pevent *pevent = event->pevent;
4358 unsigned long long addr;
4359 struct format_field *field;
4360 struct printk_map *printk;
4361 char *format;
4362
4363 field = pevent->bprint_fmt_field;
4364
4365 if (!field) {
4366 field = pevent_find_field(event, "fmt");
4367 if (!field) {
4368 do_warning_event(event, "can't find format field for binary printk");
4369 return NULL;
4370 }
4371 pevent->bprint_fmt_field = field;
4372 }
4373
4374 addr = pevent_read_number(pevent, data + field->offset, field->size);
4375
4376 printk = find_printk(pevent, addr);
4377 if (!printk) {
4378 if (asprintf(&format, "%%pf: (NO FORMAT FOUND at %llx)\n", addr) < 0)
4379 return NULL;
4380 return format;
4381 }
4382
4383 if (asprintf(&format, "%s: %s", "%pf", printk->printk) < 0)
4384 return NULL;
4385
4386 return format;
4387 }
4388
4389 static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
4390 struct event_format *event, struct print_arg *arg)
4391 {
4392 unsigned char *buf;
4393 const char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
4394
4395 if (arg->type == PRINT_FUNC) {
4396 process_defined_func(s, data, size, event, arg);
4397 return;
4398 }
4399
4400 if (arg->type != PRINT_FIELD) {
4401 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
4402 arg->type);
4403 return;
4404 }
4405
4406 if (mac == 'm')
4407 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
4408 if (!arg->field.field) {
4409 arg->field.field =
4410 pevent_find_any_field(event, arg->field.name);
4411 if (!arg->field.field) {
4412 do_warning_event(event, "%s: field %s not found",
4413 __func__, arg->field.name);
4414 return;
4415 }
4416 }
4417 if (arg->field.field->size != 6) {
4418 trace_seq_printf(s, "INVALIDMAC");
4419 return;
4420 }
4421 buf = data + arg->field.field->offset;
4422 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
4423 }
4424
4425 static void print_ip4_addr(struct trace_seq *s, char i, unsigned char *buf)
4426 {
4427 const char *fmt;
4428
4429 if (i == 'i')
4430 fmt = "%03d.%03d.%03d.%03d";
4431 else
4432 fmt = "%d.%d.%d.%d";
4433
4434 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3]);
4435 }
4436
4437 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
4438 {
4439 return ((unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
4440 (unsigned long)(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
4441 }
4442
4443 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
4444 {
4445 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
4446 }
4447
4448 static void print_ip6c_addr(struct trace_seq *s, unsigned char *addr)
4449 {
4450 int i, j, range;
4451 unsigned char zerolength[8];
4452 int longest = 1;
4453 int colonpos = -1;
4454 uint16_t word;
4455 uint8_t hi, lo;
4456 bool needcolon = false;
4457 bool useIPv4;
4458 struct in6_addr in6;
4459
4460 memcpy(&in6, addr, sizeof(struct in6_addr));
4461
4462 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
4463
4464 memset(zerolength, 0, sizeof(zerolength));
4465
4466 if (useIPv4)
4467 range = 6;
4468 else
4469 range = 8;
4470
4471 /* find position of longest 0 run */
4472 for (i = 0; i < range; i++) {
4473 for (j = i; j < range; j++) {
4474 if (in6.s6_addr16[j] != 0)
4475 break;
4476 zerolength[i]++;
4477 }
4478 }
4479 for (i = 0; i < range; i++) {
4480 if (zerolength[i] > longest) {
4481 longest = zerolength[i];
4482 colonpos = i;
4483 }
4484 }
4485 if (longest == 1) /* don't compress a single 0 */
4486 colonpos = -1;
4487
4488 /* emit address */
4489 for (i = 0; i < range; i++) {
4490 if (i == colonpos) {
4491 if (needcolon || i == 0)
4492 trace_seq_printf(s, ":");
4493 trace_seq_printf(s, ":");
4494 needcolon = false;
4495 i += longest - 1;
4496 continue;
4497 }
4498 if (needcolon) {
4499 trace_seq_printf(s, ":");
4500 needcolon = false;
4501 }
4502 /* hex u16 without leading 0s */
4503 word = ntohs(in6.s6_addr16[i]);
4504 hi = word >> 8;
4505 lo = word & 0xff;
4506 if (hi)
4507 trace_seq_printf(s, "%x%02x", hi, lo);
4508 else
4509 trace_seq_printf(s, "%x", lo);
4510
4511 needcolon = true;
4512 }
4513
4514 if (useIPv4) {
4515 if (needcolon)
4516 trace_seq_printf(s, ":");
4517 print_ip4_addr(s, 'I', &in6.s6_addr[12]);
4518 }
4519
4520 return;
4521 }
4522
4523 static void print_ip6_addr(struct trace_seq *s, char i, unsigned char *buf)
4524 {
4525 int j;
4526
4527 for (j = 0; j < 16; j += 2) {
4528 trace_seq_printf(s, "%02x%02x", buf[j], buf[j+1]);
4529 if (i == 'I' && j < 14)
4530 trace_seq_printf(s, ":");
4531 }
4532 }
4533
4534 /*
4535 * %pi4 print an IPv4 address with leading zeros
4536 * %pI4 print an IPv4 address without leading zeros
4537 * %pi6 print an IPv6 address without colons
4538 * %pI6 print an IPv6 address with colons
4539 * %pI6c print an IPv6 address in compressed form with colons
4540 * %pISpc print an IP address based on sockaddr; p adds port.
4541 */
4542 static int print_ipv4_arg(struct trace_seq *s, const char *ptr, char i,
4543 void *data, int size, struct event_format *event,
4544 struct print_arg *arg)
4545 {
4546 unsigned char *buf;
4547
4548 if (arg->type == PRINT_FUNC) {
4549 process_defined_func(s, data, size, event, arg);
4550 return 0;
4551 }
4552
4553 if (arg->type != PRINT_FIELD) {
4554 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
4555 return 0;
4556 }
4557
4558 if (!arg->field.field) {
4559 arg->field.field =
4560 pevent_find_any_field(event, arg->field.name);
4561 if (!arg->field.field) {
4562 do_warning("%s: field %s not found",
4563 __func__, arg->field.name);
4564 return 0;
4565 }
4566 }
4567
4568 buf = data + arg->field.field->offset;
4569
4570 if (arg->field.field->size != 4) {
4571 trace_seq_printf(s, "INVALIDIPv4");
4572 return 0;
4573 }
4574 print_ip4_addr(s, i, buf);
4575
4576 return 0;
4577 }
4578
4579 static int print_ipv6_arg(struct trace_seq *s, const char *ptr, char i,
4580 void *data, int size, struct event_format *event,
4581 struct print_arg *arg)
4582 {
4583 char have_c = 0;
4584 unsigned char *buf;
4585 int rc = 0;
4586
4587 /* pI6c */
4588 if (i == 'I' && *ptr == 'c') {
4589 have_c = 1;
4590 ptr++;
4591 rc++;
4592 }
4593
4594 if (arg->type == PRINT_FUNC) {
4595 process_defined_func(s, data, size, event, arg);
4596 return rc;
4597 }
4598
4599 if (arg->type != PRINT_FIELD) {
4600 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
4601 return rc;
4602 }
4603
4604 if (!arg->field.field) {
4605 arg->field.field =
4606 pevent_find_any_field(event, arg->field.name);
4607 if (!arg->field.field) {
4608 do_warning("%s: field %s not found",
4609 __func__, arg->field.name);
4610 return rc;
4611 }
4612 }
4613
4614 buf = data + arg->field.field->offset;
4615
4616 if (arg->field.field->size != 16) {
4617 trace_seq_printf(s, "INVALIDIPv6");
4618 return rc;
4619 }
4620
4621 if (have_c)
4622 print_ip6c_addr(s, buf);
4623 else
4624 print_ip6_addr(s, i, buf);
4625
4626 return rc;
4627 }
4628
4629 static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
4630 void *data, int size, struct event_format *event,
4631 struct print_arg *arg)
4632 {
4633 char have_c = 0, have_p = 0;
4634 unsigned char *buf;
4635 struct sockaddr_storage *sa;
4636 int rc = 0;
4637
4638 /* pISpc */
4639 if (i == 'I') {
4640 if (*ptr == 'p') {
4641 have_p = 1;
4642 ptr++;
4643 rc++;
4644 }
4645 if (*ptr == 'c') {
4646 have_c = 1;
4647 ptr++;
4648 rc++;
4649 }
4650 }
4651
4652 if (arg->type == PRINT_FUNC) {
4653 process_defined_func(s, data, size, event, arg);
4654 return rc;
4655 }
4656
4657 if (arg->type != PRINT_FIELD) {
4658 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
4659 return rc;
4660 }
4661
4662 if (!arg->field.field) {
4663 arg->field.field =
4664 pevent_find_any_field(event, arg->field.name);
4665 if (!arg->field.field) {
4666 do_warning("%s: field %s not found",
4667 __func__, arg->field.name);
4668 return rc;
4669 }
4670 }
4671
4672 sa = (struct sockaddr_storage *) (data + arg->field.field->offset);
4673
4674 if (sa->ss_family == AF_INET) {
4675 struct sockaddr_in *sa4 = (struct sockaddr_in *) sa;
4676
4677 if (arg->field.field->size < sizeof(struct sockaddr_in)) {
4678 trace_seq_printf(s, "INVALIDIPv4");
4679 return rc;
4680 }
4681
4682 print_ip4_addr(s, i, (unsigned char *) &sa4->sin_addr);
4683 if (have_p)
4684 trace_seq_printf(s, ":%d", ntohs(sa4->sin_port));
4685
4686
4687 } else if (sa->ss_family == AF_INET6) {
4688 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
4689
4690 if (arg->field.field->size < sizeof(struct sockaddr_in6)) {
4691 trace_seq_printf(s, "INVALIDIPv6");
4692 return rc;
4693 }
4694
4695 if (have_p)
4696 trace_seq_printf(s, "[");
4697
4698 buf = (unsigned char *) &sa6->sin6_addr;
4699 if (have_c)
4700 print_ip6c_addr(s, buf);
4701 else
4702 print_ip6_addr(s, i, buf);
4703
4704 if (have_p)
4705 trace_seq_printf(s, "]:%d", ntohs(sa6->sin6_port));
4706 }
4707
4708 return rc;
4709 }
4710
4711 static int print_ip_arg(struct trace_seq *s, const char *ptr,
4712 void *data, int size, struct event_format *event,
4713 struct print_arg *arg)
4714 {
4715 char i = *ptr; /* 'i' or 'I' */
4716 char ver;
4717 int rc = 0;
4718
4719 ptr++;
4720 rc++;
4721
4722 ver = *ptr;
4723 ptr++;
4724 rc++;
4725
4726 switch (ver) {
4727 case '4':
4728 rc += print_ipv4_arg(s, ptr, i, data, size, event, arg);
4729 break;
4730 case '6':
4731 rc += print_ipv6_arg(s, ptr, i, data, size, event, arg);
4732 break;
4733 case 'S':
4734 rc += print_ipsa_arg(s, ptr, i, data, size, event, arg);
4735 break;
4736 default:
4737 return 0;
4738 }
4739
4740 return rc;
4741 }
4742
4743 static int is_printable_array(char *p, unsigned int len)
4744 {
4745 unsigned int i;
4746
4747 for (i = 0; i < len && p[i]; i++)
4748 if (!isprint(p[i]) && !isspace(p[i]))
4749 return 0;
4750 return 1;
4751 }
4752
4753 void pevent_print_field(struct trace_seq *s, void *data,
4754 struct format_field *field)
4755 {
4756 unsigned long long val;
4757 unsigned int offset, len, i;
4758 struct pevent *pevent = field->event->pevent;
4759
4760 if (field->flags & FIELD_IS_ARRAY) {
4761 offset = field->offset;
4762 len = field->size;
4763 if (field->flags & FIELD_IS_DYNAMIC) {
4764 val = pevent_read_number(pevent, data + offset, len);
4765 offset = val;
4766 len = offset >> 16;
4767 offset &= 0xffff;
4768 }
4769 if (field->flags & FIELD_IS_STRING &&
4770 is_printable_array(data + offset, len)) {
4771 trace_seq_printf(s, "%s", (char *)data + offset);
4772 } else {
4773 trace_seq_puts(s, "ARRAY[");
4774 for (i = 0; i < len; i++) {
4775 if (i)
4776 trace_seq_puts(s, ", ");
4777 trace_seq_printf(s, "%02x",
4778 *((unsigned char *)data + offset + i));
4779 }
4780 trace_seq_putc(s, ']');
4781 field->flags &= ~FIELD_IS_STRING;
4782 }
4783 } else {
4784 val = pevent_read_number(pevent, data + field->offset,
4785 field->size);
4786 if (field->flags & FIELD_IS_POINTER) {
4787 trace_seq_printf(s, "0x%llx", val);
4788 } else if (field->flags & FIELD_IS_SIGNED) {
4789 switch (field->size) {
4790 case 4:
4791 /*
4792 * If field is long then print it in hex.
4793 * A long usually stores pointers.
4794 */
4795 if (field->flags & FIELD_IS_LONG)
4796 trace_seq_printf(s, "0x%x", (int)val);
4797 else
4798 trace_seq_printf(s, "%d", (int)val);
4799 break;
4800 case 2:
4801 trace_seq_printf(s, "%2d", (short)val);
4802 break;
4803 case 1:
4804 trace_seq_printf(s, "%1d", (char)val);
4805 break;
4806 default:
4807 trace_seq_printf(s, "%lld", val);
4808 }
4809 } else {
4810 if (field->flags & FIELD_IS_LONG)
4811 trace_seq_printf(s, "0x%llx", val);
4812 else
4813 trace_seq_printf(s, "%llu", val);
4814 }
4815 }
4816 }
4817
4818 void pevent_print_fields(struct trace_seq *s, void *data,
4819 int size __maybe_unused, struct event_format *event)
4820 {
4821 struct format_field *field;
4822
4823 field = event->format.fields;
4824 while (field) {
4825 trace_seq_printf(s, " %s=", field->name);
4826 pevent_print_field(s, data, field);
4827 field = field->next;
4828 }
4829 }
4830
4831 static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
4832 {
4833 struct pevent *pevent = event->pevent;
4834 struct print_fmt *print_fmt = &event->print_fmt;
4835 struct print_arg *arg = print_fmt->args;
4836 struct print_arg *args = NULL;
4837 const char *ptr = print_fmt->format;
4838 unsigned long long val;
4839 struct func_map *func;
4840 const char *saveptr;
4841 struct trace_seq p;
4842 char *bprint_fmt = NULL;
4843 char format[32];
4844 int show_func;
4845 int len_as_arg;
4846 int len_arg;
4847 int len;
4848 int ls;
4849
4850 if (event->flags & EVENT_FL_FAILED) {
4851 trace_seq_printf(s, "[FAILED TO PARSE]");
4852 pevent_print_fields(s, data, size, event);
4853 return;
4854 }
4855
4856 if (event->flags & EVENT_FL_ISBPRINT) {
4857 bprint_fmt = get_bprint_format(data, size, event);
4858 args = make_bprint_args(bprint_fmt, data, size, event);
4859 arg = args;
4860 ptr = bprint_fmt;
4861 }
4862
4863 for (; *ptr; ptr++) {
4864 ls = 0;
4865 if (*ptr == '\\') {
4866 ptr++;
4867 switch (*ptr) {
4868 case 'n':
4869 trace_seq_putc(s, '\n');
4870 break;
4871 case 't':
4872 trace_seq_putc(s, '\t');
4873 break;
4874 case 'r':
4875 trace_seq_putc(s, '\r');
4876 break;
4877 case '\\':
4878 trace_seq_putc(s, '\\');
4879 break;
4880 default:
4881 trace_seq_putc(s, *ptr);
4882 break;
4883 }
4884
4885 } else if (*ptr == '%') {
4886 saveptr = ptr;
4887 show_func = 0;
4888 len_as_arg = 0;
4889 cont_process:
4890 ptr++;
4891 switch (*ptr) {
4892 case '%':
4893 trace_seq_putc(s, '%');
4894 break;
4895 case '#':
4896 /* FIXME: need to handle properly */
4897 goto cont_process;
4898 case 'h':
4899 ls--;
4900 goto cont_process;
4901 case 'l':
4902 ls++;
4903 goto cont_process;
4904 case 'L':
4905 ls = 2;
4906 goto cont_process;
4907 case '*':
4908 /* The argument is the length. */
4909 if (!arg) {
4910 do_warning_event(event, "no argument match");
4911 event->flags |= EVENT_FL_FAILED;
4912 goto out_failed;
4913 }
4914 len_arg = eval_num_arg(data, size, event, arg);
4915 len_as_arg = 1;
4916 arg = arg->next;
4917 goto cont_process;
4918 case '.':
4919 case 'z':
4920 case 'Z':
4921 case '0' ... '9':
4922 case '-':
4923 goto cont_process;
4924 case 'p':
4925 if (pevent->long_size == 4)
4926 ls = 1;
4927 else
4928 ls = 2;
4929
4930 if (*(ptr+1) == 'F' || *(ptr+1) == 'f' ||
4931 *(ptr+1) == 'S' || *(ptr+1) == 's') {
4932 ptr++;
4933 show_func = *ptr;
4934 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
4935 print_mac_arg(s, *(ptr+1), data, size, event, arg);
4936 ptr++;
4937 arg = arg->next;
4938 break;
4939 } else if (*(ptr+1) == 'I' || *(ptr+1) == 'i') {
4940 int n;
4941
4942 n = print_ip_arg(s, ptr+1, data, size, event, arg);
4943 if (n > 0) {
4944 ptr += n;
4945 arg = arg->next;
4946 break;
4947 }
4948 }
4949
4950 /* fall through */
4951 case 'd':
4952 case 'i':
4953 case 'x':
4954 case 'X':
4955 case 'u':
4956 if (!arg) {
4957 do_warning_event(event, "no argument match");
4958 event->flags |= EVENT_FL_FAILED;
4959 goto out_failed;
4960 }
4961
4962 len = ((unsigned long)ptr + 1) -
4963 (unsigned long)saveptr;
4964
4965 /* should never happen */
4966 if (len > 31) {
4967 do_warning_event(event, "bad format!");
4968 event->flags |= EVENT_FL_FAILED;
4969 len = 31;
4970 }
4971
4972 memcpy(format, saveptr, len);
4973 format[len] = 0;
4974
4975 val = eval_num_arg(data, size, event, arg);
4976 arg = arg->next;
4977
4978 if (show_func) {
4979 func = find_func(pevent, val);
4980 if (func) {
4981 trace_seq_puts(s, func->func);
4982 if (show_func == 'F')
4983 trace_seq_printf(s,
4984 "+0x%llx",
4985 val - func->addr);
4986 break;
4987 }
4988 }
4989 if (pevent->long_size == 8 && ls == 1 &&
4990 sizeof(long) != 8) {
4991 char *p;
4992
4993 /* make %l into %ll */
4994 if (ls == 1 && (p = strchr(format, 'l')))
4995 memmove(p+1, p, strlen(p)+1);
4996 else if (strcmp(format, "%p") == 0)
4997 strcpy(format, "0x%llx");
4998 ls = 2;
4999 }
5000 switch (ls) {
5001 case -2:
5002 if (len_as_arg)
5003 trace_seq_printf(s, format, len_arg, (char)val);
5004 else
5005 trace_seq_printf(s, format, (char)val);
5006 break;
5007 case -1:
5008 if (len_as_arg)
5009 trace_seq_printf(s, format, len_arg, (short)val);
5010 else
5011 trace_seq_printf(s, format, (short)val);
5012 break;
5013 case 0:
5014 if (len_as_arg)
5015 trace_seq_printf(s, format, len_arg, (int)val);
5016 else
5017 trace_seq_printf(s, format, (int)val);
5018 break;
5019 case 1:
5020 if (len_as_arg)
5021 trace_seq_printf(s, format, len_arg, (long)val);
5022 else
5023 trace_seq_printf(s, format, (long)val);
5024 break;
5025 case 2:
5026 if (len_as_arg)
5027 trace_seq_printf(s, format, len_arg,
5028 (long long)val);
5029 else
5030 trace_seq_printf(s, format, (long long)val);
5031 break;
5032 default:
5033 do_warning_event(event, "bad count (%d)", ls);
5034 event->flags |= EVENT_FL_FAILED;
5035 }
5036 break;
5037 case 's':
5038 if (!arg) {
5039 do_warning_event(event, "no matching argument");
5040 event->flags |= EVENT_FL_FAILED;
5041 goto out_failed;
5042 }
5043
5044 len = ((unsigned long)ptr + 1) -
5045 (unsigned long)saveptr;
5046
5047 /* should never happen */
5048 if (len > 31) {
5049 do_warning_event(event, "bad format!");
5050 event->flags |= EVENT_FL_FAILED;
5051 len = 31;
5052 }
5053
5054 memcpy(format, saveptr, len);
5055 format[len] = 0;
5056 if (!len_as_arg)
5057 len_arg = -1;
5058 /* Use helper trace_seq */
5059 trace_seq_init(&p);
5060 print_str_arg(&p, data, size, event,
5061 format, len_arg, arg);
5062 trace_seq_terminate(&p);
5063 trace_seq_puts(s, p.buffer);
5064 trace_seq_destroy(&p);
5065 arg = arg->next;
5066 break;
5067 default:
5068 trace_seq_printf(s, ">%c<", *ptr);
5069
5070 }
5071 } else
5072 trace_seq_putc(s, *ptr);
5073 }
5074
5075 if (event->flags & EVENT_FL_FAILED) {
5076 out_failed:
5077 trace_seq_printf(s, "[FAILED TO PARSE]");
5078 }
5079
5080 if (args) {
5081 free_args(args);
5082 free(bprint_fmt);
5083 }
5084 }
5085
5086 /**
5087 * pevent_data_lat_fmt - parse the data for the latency format
5088 * @pevent: a handle to the pevent
5089 * @s: the trace_seq to write to
5090 * @record: the record to read from
5091 *
5092 * This parses out the Latency format (interrupts disabled,
5093 * need rescheduling, in hard/soft interrupt, preempt count
5094 * and lock depth) and places it into the trace_seq.
5095 */
5096 void pevent_data_lat_fmt(struct pevent *pevent,
5097 struct trace_seq *s, struct pevent_record *record)
5098 {
5099 static int check_lock_depth = 1;
5100 static int check_migrate_disable = 1;
5101 static int lock_depth_exists;
5102 static int migrate_disable_exists;
5103 unsigned int lat_flags;
5104 unsigned int pc;
5105 int lock_depth;
5106 int migrate_disable;
5107 int hardirq;
5108 int softirq;
5109 void *data = record->data;
5110
5111 lat_flags = parse_common_flags(pevent, data);
5112 pc = parse_common_pc(pevent, data);
5113 /* lock_depth may not always exist */
5114 if (lock_depth_exists)
5115 lock_depth = parse_common_lock_depth(pevent, data);
5116 else if (check_lock_depth) {
5117 lock_depth = parse_common_lock_depth(pevent, data);
5118 if (lock_depth < 0)
5119 check_lock_depth = 0;
5120 else
5121 lock_depth_exists = 1;
5122 }
5123
5124 /* migrate_disable may not always exist */
5125 if (migrate_disable_exists)
5126 migrate_disable = parse_common_migrate_disable(pevent, data);
5127 else if (check_migrate_disable) {
5128 migrate_disable = parse_common_migrate_disable(pevent, data);
5129 if (migrate_disable < 0)
5130 check_migrate_disable = 0;
5131 else
5132 migrate_disable_exists = 1;
5133 }
5134
5135 hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
5136 softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
5137
5138 trace_seq_printf(s, "%c%c%c",
5139 (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
5140 (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
5141 'X' : '.',
5142 (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
5143 'N' : '.',
5144 (hardirq && softirq) ? 'H' :
5145 hardirq ? 'h' : softirq ? 's' : '.');
5146
5147 if (pc)
5148 trace_seq_printf(s, "%x", pc);
5149 else
5150 trace_seq_putc(s, '.');
5151
5152 if (migrate_disable_exists) {
5153 if (migrate_disable < 0)
5154 trace_seq_putc(s, '.');
5155 else
5156 trace_seq_printf(s, "%d", migrate_disable);
5157 }
5158
5159 if (lock_depth_exists) {
5160 if (lock_depth < 0)
5161 trace_seq_putc(s, '.');
5162 else
5163 trace_seq_printf(s, "%d", lock_depth);
5164 }
5165
5166 trace_seq_terminate(s);
5167 }
5168
5169 /**
5170 * pevent_data_type - parse out the given event type
5171 * @pevent: a handle to the pevent
5172 * @rec: the record to read from
5173 *
5174 * This returns the event id from the @rec.
5175 */
5176 int pevent_data_type(struct pevent *pevent, struct pevent_record *rec)
5177 {
5178 return trace_parse_common_type(pevent, rec->data);
5179 }
5180
5181 /**
5182 * pevent_data_event_from_type - find the event by a given type
5183 * @pevent: a handle to the pevent
5184 * @type: the type of the event.
5185 *
5186 * This returns the event form a given @type;
5187 */
5188 struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
5189 {
5190 return pevent_find_event(pevent, type);
5191 }
5192
5193 /**
5194 * pevent_data_pid - parse the PID from raw data
5195 * @pevent: a handle to the pevent
5196 * @rec: the record to parse
5197 *
5198 * This returns the PID from a raw data.
5199 */
5200 int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec)
5201 {
5202 return parse_common_pid(pevent, rec->data);
5203 }
5204
5205 /**
5206 * pevent_data_comm_from_pid - return the command line from PID
5207 * @pevent: a handle to the pevent
5208 * @pid: the PID of the task to search for
5209 *
5210 * This returns a pointer to the command line that has the given
5211 * @pid.
5212 */
5213 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
5214 {
5215 const char *comm;
5216
5217 comm = find_cmdline(pevent, pid);
5218 return comm;
5219 }
5220
5221 static struct cmdline *
5222 pid_from_cmdlist(struct pevent *pevent, const char *comm, struct cmdline *next)
5223 {
5224 struct cmdline_list *cmdlist = (struct cmdline_list *)next;
5225
5226 if (cmdlist)
5227 cmdlist = cmdlist->next;
5228 else
5229 cmdlist = pevent->cmdlist;
5230
5231 while (cmdlist && strcmp(cmdlist->comm, comm) != 0)
5232 cmdlist = cmdlist->next;
5233
5234 return (struct cmdline *)cmdlist;
5235 }
5236
5237 /**
5238 * pevent_data_pid_from_comm - return the pid from a given comm
5239 * @pevent: a handle to the pevent
5240 * @comm: the cmdline to find the pid from
5241 * @next: the cmdline structure to find the next comm
5242 *
5243 * This returns the cmdline structure that holds a pid for a given
5244 * comm, or NULL if none found. As there may be more than one pid for
5245 * a given comm, the result of this call can be passed back into
5246 * a recurring call in the @next paramater, and then it will find the
5247 * next pid.
5248 * Also, it does a linear seach, so it may be slow.
5249 */
5250 struct cmdline *pevent_data_pid_from_comm(struct pevent *pevent, const char *comm,
5251 struct cmdline *next)
5252 {
5253 struct cmdline *cmdline;
5254
5255 /*
5256 * If the cmdlines have not been converted yet, then use
5257 * the list.
5258 */
5259 if (!pevent->cmdlines)
5260 return pid_from_cmdlist(pevent, comm, next);
5261
5262 if (next) {
5263 /*
5264 * The next pointer could have been still from
5265 * a previous call before cmdlines were created
5266 */
5267 if (next < pevent->cmdlines ||
5268 next >= pevent->cmdlines + pevent->cmdline_count)
5269 next = NULL;
5270 else
5271 cmdline = next++;
5272 }
5273
5274 if (!next)
5275 cmdline = pevent->cmdlines;
5276
5277 while (cmdline < pevent->cmdlines + pevent->cmdline_count) {
5278 if (strcmp(cmdline->comm, comm) == 0)
5279 return cmdline;
5280 cmdline++;
5281 }
5282 return NULL;
5283 }
5284
5285 /**
5286 * pevent_cmdline_pid - return the pid associated to a given cmdline
5287 * @cmdline: The cmdline structure to get the pid from
5288 *
5289 * Returns the pid for a give cmdline. If @cmdline is NULL, then
5290 * -1 is returned.
5291 */
5292 int pevent_cmdline_pid(struct pevent *pevent, struct cmdline *cmdline)
5293 {
5294 struct cmdline_list *cmdlist = (struct cmdline_list *)cmdline;
5295
5296 if (!cmdline)
5297 return -1;
5298
5299 /*
5300 * If cmdlines have not been created yet, or cmdline is
5301 * not part of the array, then treat it as a cmdlist instead.
5302 */
5303 if (!pevent->cmdlines ||
5304 cmdline < pevent->cmdlines ||
5305 cmdline >= pevent->cmdlines + pevent->cmdline_count)
5306 return cmdlist->pid;
5307
5308 return cmdline->pid;
5309 }
5310
5311 /**
5312 * pevent_data_comm_from_pid - parse the data into the print format
5313 * @s: the trace_seq to write to
5314 * @event: the handle to the event
5315 * @record: the record to read from
5316 *
5317 * This parses the raw @data using the given @event information and
5318 * writes the print format into the trace_seq.
5319 */
5320 void pevent_event_info(struct trace_seq *s, struct event_format *event,
5321 struct pevent_record *record)
5322 {
5323 int print_pretty = 1;
5324
5325 if (event->pevent->print_raw || (event->flags & EVENT_FL_PRINTRAW))
5326 pevent_print_fields(s, record->data, record->size, event);
5327 else {
5328
5329 if (event->handler && !(event->flags & EVENT_FL_NOHANDLE))
5330 print_pretty = event->handler(s, record, event,
5331 event->context);
5332
5333 if (print_pretty)
5334 pretty_print(s, record->data, record->size, event);
5335 }
5336
5337 trace_seq_terminate(s);
5338 }
5339
5340 static bool is_timestamp_in_us(char *trace_clock, bool use_trace_clock)
5341 {
5342 if (!use_trace_clock)
5343 return true;
5344
5345 if (!strcmp(trace_clock, "local") || !strcmp(trace_clock, "global")
5346 || !strcmp(trace_clock, "uptime") || !strcmp(trace_clock, "perf"))
5347 return true;
5348
5349 /* trace_clock is setting in tsc or counter mode */
5350 return false;
5351 }
5352
5353 /**
5354 * pevent_find_event_by_record - return the event from a given record
5355 * @pevent: a handle to the pevent
5356 * @record: The record to get the event from
5357 *
5358 * Returns the associated event for a given record, or NULL if non is
5359 * is found.
5360 */
5361 struct event_format *
5362 pevent_find_event_by_record(struct pevent *pevent, struct pevent_record *record)
5363 {
5364 int type;
5365
5366 if (record->size < 0) {
5367 do_warning("ug! negative record size %d", record->size);
5368 return NULL;
5369 }
5370
5371 type = trace_parse_common_type(pevent, record->data);
5372
5373 return pevent_find_event(pevent, type);
5374 }
5375
5376 /**
5377 * pevent_print_event_task - Write the event task comm, pid and CPU
5378 * @pevent: a handle to the pevent
5379 * @s: the trace_seq to write to
5380 * @event: the handle to the record's event
5381 * @record: The record to get the event from
5382 *
5383 * Writes the tasks comm, pid and CPU to @s.
5384 */
5385 void pevent_print_event_task(struct pevent *pevent, struct trace_seq *s,
5386 struct event_format *event,
5387 struct pevent_record *record)
5388 {
5389 void *data = record->data;
5390 const char *comm;
5391 int pid;
5392
5393 pid = parse_common_pid(pevent, data);
5394 comm = find_cmdline(pevent, pid);
5395
5396 if (pevent->latency_format) {
5397 trace_seq_printf(s, "%8.8s-%-5d %3d",
5398 comm, pid, record->cpu);
5399 } else
5400 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
5401 }
5402
5403 /**
5404 * pevent_print_event_time - Write the event timestamp
5405 * @pevent: a handle to the pevent
5406 * @s: the trace_seq to write to
5407 * @event: the handle to the record's event
5408 * @record: The record to get the event from
5409 * @use_trace_clock: Set to parse according to the @pevent->trace_clock
5410 *
5411 * Writes the timestamp of the record into @s.
5412 */
5413 void pevent_print_event_time(struct pevent *pevent, struct trace_seq *s,
5414 struct event_format *event,
5415 struct pevent_record *record,
5416 bool use_trace_clock)
5417 {
5418 unsigned long secs;
5419 unsigned long usecs;
5420 unsigned long nsecs;
5421 int p;
5422 bool use_usec_format;
5423
5424 use_usec_format = is_timestamp_in_us(pevent->trace_clock,
5425 use_trace_clock);
5426 if (use_usec_format) {
5427 secs = record->ts / NSECS_PER_SEC;
5428 nsecs = record->ts - secs * NSECS_PER_SEC;
5429 }
5430
5431 if (pevent->latency_format) {
5432 pevent_data_lat_fmt(pevent, s, record);
5433 }
5434
5435 if (use_usec_format) {
5436 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
5437 usecs = nsecs;
5438 p = 9;
5439 } else {
5440 usecs = (nsecs + 500) / NSECS_PER_USEC;
5441 /* To avoid usecs larger than 1 sec */
5442 if (usecs >= 1000000) {
5443 usecs -= 1000000;
5444 secs++;
5445 }
5446 p = 6;
5447 }
5448
5449 trace_seq_printf(s, " %5lu.%0*lu:", secs, p, usecs);
5450 } else
5451 trace_seq_printf(s, " %12llu:", record->ts);
5452 }
5453
5454 /**
5455 * pevent_print_event_data - Write the event data section
5456 * @pevent: a handle to the pevent
5457 * @s: the trace_seq to write to
5458 * @event: the handle to the record's event
5459 * @record: The record to get the event from
5460 *
5461 * Writes the parsing of the record's data to @s.
5462 */
5463 void pevent_print_event_data(struct pevent *pevent, struct trace_seq *s,
5464 struct event_format *event,
5465 struct pevent_record *record)
5466 {
5467 static const char *spaces = " "; /* 20 spaces */
5468 int len;
5469
5470 trace_seq_printf(s, " %s: ", event->name);
5471
5472 /* Space out the event names evenly. */
5473 len = strlen(event->name);
5474 if (len < 20)
5475 trace_seq_printf(s, "%.*s", 20 - len, spaces);
5476
5477 pevent_event_info(s, event, record);
5478 }
5479
5480 void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
5481 struct pevent_record *record, bool use_trace_clock)
5482 {
5483 struct event_format *event;
5484
5485 event = pevent_find_event_by_record(pevent, record);
5486 if (!event) {
5487 do_warning("ug! no event found for type %d",
5488 trace_parse_common_type(pevent, record->data));
5489 return;
5490 }
5491
5492 pevent_print_event_task(pevent, s, event, record);
5493 pevent_print_event_time(pevent, s, event, record, use_trace_clock);
5494 pevent_print_event_data(pevent, s, event, record);
5495 }
5496
5497 static int events_id_cmp(const void *a, const void *b)
5498 {
5499 struct event_format * const * ea = a;
5500 struct event_format * const * eb = b;
5501
5502 if ((*ea)->id < (*eb)->id)
5503 return -1;
5504
5505 if ((*ea)->id > (*eb)->id)
5506 return 1;
5507
5508 return 0;
5509 }
5510
5511 static int events_name_cmp(const void *a, const void *b)
5512 {
5513 struct event_format * const * ea = a;
5514 struct event_format * const * eb = b;
5515 int res;
5516
5517 res = strcmp((*ea)->name, (*eb)->name);
5518 if (res)
5519 return res;
5520
5521 res = strcmp((*ea)->system, (*eb)->system);
5522 if (res)
5523 return res;
5524
5525 return events_id_cmp(a, b);
5526 }
5527
5528 static int events_system_cmp(const void *a, const void *b)
5529 {
5530 struct event_format * const * ea = a;
5531 struct event_format * const * eb = b;
5532 int res;
5533
5534 res = strcmp((*ea)->system, (*eb)->system);
5535 if (res)
5536 return res;
5537
5538 res = strcmp((*ea)->name, (*eb)->name);
5539 if (res)
5540 return res;
5541
5542 return events_id_cmp(a, b);
5543 }
5544
5545 struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
5546 {
5547 struct event_format **events;
5548 int (*sort)(const void *a, const void *b);
5549
5550 events = pevent->sort_events;
5551
5552 if (events && pevent->last_type == sort_type)
5553 return events;
5554
5555 if (!events) {
5556 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
5557 if (!events)
5558 return NULL;
5559
5560 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
5561 events[pevent->nr_events] = NULL;
5562
5563 pevent->sort_events = events;
5564
5565 /* the internal events are sorted by id */
5566 if (sort_type == EVENT_SORT_ID) {
5567 pevent->last_type = sort_type;
5568 return events;
5569 }
5570 }
5571
5572 switch (sort_type) {
5573 case EVENT_SORT_ID:
5574 sort = events_id_cmp;
5575 break;
5576 case EVENT_SORT_NAME:
5577 sort = events_name_cmp;
5578 break;
5579 case EVENT_SORT_SYSTEM:
5580 sort = events_system_cmp;
5581 break;
5582 default:
5583 return events;
5584 }
5585
5586 qsort(events, pevent->nr_events, sizeof(*events), sort);
5587 pevent->last_type = sort_type;
5588
5589 return events;
5590 }
5591
5592 static struct format_field **
5593 get_event_fields(const char *type, const char *name,
5594 int count, struct format_field *list)
5595 {
5596 struct format_field **fields;
5597 struct format_field *field;
5598 int i = 0;
5599
5600 fields = malloc(sizeof(*fields) * (count + 1));
5601 if (!fields)
5602 return NULL;
5603
5604 for (field = list; field; field = field->next) {
5605 fields[i++] = field;
5606 if (i == count + 1) {
5607 do_warning("event %s has more %s fields than specified",
5608 name, type);
5609 i--;
5610 break;
5611 }
5612 }
5613
5614 if (i != count)
5615 do_warning("event %s has less %s fields than specified",
5616 name, type);
5617
5618 fields[i] = NULL;
5619
5620 return fields;
5621 }
5622
5623 /**
5624 * pevent_event_common_fields - return a list of common fields for an event
5625 * @event: the event to return the common fields of.
5626 *
5627 * Returns an allocated array of fields. The last item in the array is NULL.
5628 * The array must be freed with free().
5629 */
5630 struct format_field **pevent_event_common_fields(struct event_format *event)
5631 {
5632 return get_event_fields("common", event->name,
5633 event->format.nr_common,
5634 event->format.common_fields);
5635 }
5636
5637 /**
5638 * pevent_event_fields - return a list of event specific fields for an event
5639 * @event: the event to return the fields of.
5640 *
5641 * Returns an allocated array of fields. The last item in the array is NULL.
5642 * The array must be freed with free().
5643 */
5644 struct format_field **pevent_event_fields(struct event_format *event)
5645 {
5646 return get_event_fields("event", event->name,
5647 event->format.nr_fields,
5648 event->format.fields);
5649 }
5650
5651 static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
5652 {
5653 trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
5654 if (field->next) {
5655 trace_seq_puts(s, ", ");
5656 print_fields(s, field->next);
5657 }
5658 }
5659
5660 /* for debugging */
5661 static void print_args(struct print_arg *args)
5662 {
5663 int print_paren = 1;
5664 struct trace_seq s;
5665
5666 switch (args->type) {
5667 case PRINT_NULL:
5668 printf("null");
5669 break;
5670 case PRINT_ATOM:
5671 printf("%s", args->atom.atom);
5672 break;
5673 case PRINT_FIELD:
5674 printf("REC->%s", args->field.name);
5675 break;
5676 case PRINT_FLAGS:
5677 printf("__print_flags(");
5678 print_args(args->flags.field);
5679 printf(", %s, ", args->flags.delim);
5680 trace_seq_init(&s);
5681 print_fields(&s, args->flags.flags);
5682 trace_seq_do_printf(&s);
5683 trace_seq_destroy(&s);
5684 printf(")");
5685 break;
5686 case PRINT_SYMBOL:
5687 printf("__print_symbolic(");
5688 print_args(args->symbol.field);
5689 printf(", ");
5690 trace_seq_init(&s);
5691 print_fields(&s, args->symbol.symbols);
5692 trace_seq_do_printf(&s);
5693 trace_seq_destroy(&s);
5694 printf(")");
5695 break;
5696 case PRINT_HEX:
5697 printf("__print_hex(");
5698 print_args(args->hex.field);
5699 printf(", ");
5700 print_args(args->hex.size);
5701 printf(")");
5702 break;
5703 case PRINT_INT_ARRAY:
5704 printf("__print_array(");
5705 print_args(args->int_array.field);
5706 printf(", ");
5707 print_args(args->int_array.count);
5708 printf(", ");
5709 print_args(args->int_array.el_size);
5710 printf(")");
5711 break;
5712 case PRINT_STRING:
5713 case PRINT_BSTRING:
5714 printf("__get_str(%s)", args->string.string);
5715 break;
5716 case PRINT_BITMASK:
5717 printf("__get_bitmask(%s)", args->bitmask.bitmask);
5718 break;
5719 case PRINT_TYPE:
5720 printf("(%s)", args->typecast.type);
5721 print_args(args->typecast.item);
5722 break;
5723 case PRINT_OP:
5724 if (strcmp(args->op.op, ":") == 0)
5725 print_paren = 0;
5726 if (print_paren)
5727 printf("(");
5728 print_args(args->op.left);
5729 printf(" %s ", args->op.op);
5730 print_args(args->op.right);
5731 if (print_paren)
5732 printf(")");
5733 break;
5734 default:
5735 /* we should warn... */
5736 return;
5737 }
5738 if (args->next) {
5739 printf("\n");
5740 print_args(args->next);
5741 }
5742 }
5743
5744 static void parse_header_field(const char *field,
5745 int *offset, int *size, int mandatory)
5746 {
5747 unsigned long long save_input_buf_ptr;
5748 unsigned long long save_input_buf_siz;
5749 char *token;
5750 int type;
5751
5752 save_input_buf_ptr = input_buf_ptr;
5753 save_input_buf_siz = input_buf_siz;
5754
5755 if (read_expected(EVENT_ITEM, "field") < 0)
5756 return;
5757 if (read_expected(EVENT_OP, ":") < 0)
5758 return;
5759
5760 /* type */
5761 if (read_expect_type(EVENT_ITEM, &token) < 0)
5762 goto fail;
5763 free_token(token);
5764
5765 /*
5766 * If this is not a mandatory field, then test it first.
5767 */
5768 if (mandatory) {
5769 if (read_expected(EVENT_ITEM, field) < 0)
5770 return;
5771 } else {
5772 if (read_expect_type(EVENT_ITEM, &token) < 0)
5773 goto fail;
5774 if (strcmp(token, field) != 0)
5775 goto discard;
5776 free_token(token);
5777 }
5778
5779 if (read_expected(EVENT_OP, ";") < 0)
5780 return;
5781 if (read_expected(EVENT_ITEM, "offset") < 0)
5782 return;
5783 if (read_expected(EVENT_OP, ":") < 0)
5784 return;
5785 if (read_expect_type(EVENT_ITEM, &token) < 0)
5786 goto fail;
5787 *offset = atoi(token);
5788 free_token(token);
5789 if (read_expected(EVENT_OP, ";") < 0)
5790 return;
5791 if (read_expected(EVENT_ITEM, "size") < 0)
5792 return;
5793 if (read_expected(EVENT_OP, ":") < 0)
5794 return;
5795 if (read_expect_type(EVENT_ITEM, &token) < 0)
5796 goto fail;
5797 *size = atoi(token);
5798 free_token(token);
5799 if (read_expected(EVENT_OP, ";") < 0)
5800 return;
5801 type = read_token(&token);
5802 if (type != EVENT_NEWLINE) {
5803 /* newer versions of the kernel have a "signed" type */
5804 if (type != EVENT_ITEM)
5805 goto fail;
5806
5807 if (strcmp(token, "signed") != 0)
5808 goto fail;
5809
5810 free_token(token);
5811
5812 if (read_expected(EVENT_OP, ":") < 0)
5813 return;
5814
5815 if (read_expect_type(EVENT_ITEM, &token))
5816 goto fail;
5817
5818 free_token(token);
5819 if (read_expected(EVENT_OP, ";") < 0)
5820 return;
5821
5822 if (read_expect_type(EVENT_NEWLINE, &token))
5823 goto fail;
5824 }
5825 fail:
5826 free_token(token);
5827 return;
5828
5829 discard:
5830 input_buf_ptr = save_input_buf_ptr;
5831 input_buf_siz = save_input_buf_siz;
5832 *offset = 0;
5833 *size = 0;
5834 free_token(token);
5835 }
5836
5837 /**
5838 * pevent_parse_header_page - parse the data stored in the header page
5839 * @pevent: the handle to the pevent
5840 * @buf: the buffer storing the header page format string
5841 * @size: the size of @buf
5842 * @long_size: the long size to use if there is no header
5843 *
5844 * This parses the header page format for information on the
5845 * ring buffer used. The @buf should be copied from
5846 *
5847 * /sys/kernel/debug/tracing/events/header_page
5848 */
5849 int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
5850 int long_size)
5851 {
5852 int ignore;
5853
5854 if (!size) {
5855 /*
5856 * Old kernels did not have header page info.
5857 * Sorry but we just use what we find here in user space.
5858 */
5859 pevent->header_page_ts_size = sizeof(long long);
5860 pevent->header_page_size_size = long_size;
5861 pevent->header_page_data_offset = sizeof(long long) + long_size;
5862 pevent->old_format = 1;
5863 return -1;
5864 }
5865 init_input_buf(buf, size);
5866
5867 parse_header_field("timestamp", &pevent->header_page_ts_offset,
5868 &pevent->header_page_ts_size, 1);
5869 parse_header_field("commit", &pevent->header_page_size_offset,
5870 &pevent->header_page_size_size, 1);
5871 parse_header_field("overwrite", &pevent->header_page_overwrite,
5872 &ignore, 0);
5873 parse_header_field("data", &pevent->header_page_data_offset,
5874 &pevent->header_page_data_size, 1);
5875
5876 return 0;
5877 }
5878
5879 static int event_matches(struct event_format *event,
5880 int id, const char *sys_name,
5881 const char *event_name)
5882 {
5883 if (id >= 0 && id != event->id)
5884 return 0;
5885
5886 if (event_name && (strcmp(event_name, event->name) != 0))
5887 return 0;
5888
5889 if (sys_name && (strcmp(sys_name, event->system) != 0))
5890 return 0;
5891
5892 return 1;
5893 }
5894
5895 static void free_handler(struct event_handler *handle)
5896 {
5897 free((void *)handle->sys_name);
5898 free((void *)handle->event_name);
5899 free(handle);
5900 }
5901
5902 static int find_event_handle(struct pevent *pevent, struct event_format *event)
5903 {
5904 struct event_handler *handle, **next;
5905
5906 for (next = &pevent->handlers; *next;
5907 next = &(*next)->next) {
5908 handle = *next;
5909 if (event_matches(event, handle->id,
5910 handle->sys_name,
5911 handle->event_name))
5912 break;
5913 }
5914
5915 if (!(*next))
5916 return 0;
5917
5918 pr_stat("overriding event (%d) %s:%s with new print handler",
5919 event->id, event->system, event->name);
5920
5921 event->handler = handle->func;
5922 event->context = handle->context;
5923
5924 *next = handle->next;
5925 free_handler(handle);
5926
5927 return 1;
5928 }
5929
5930 /**
5931 * __pevent_parse_format - parse the event format
5932 * @buf: the buffer storing the event format string
5933 * @size: the size of @buf
5934 * @sys: the system the event belongs to
5935 *
5936 * This parses the event format and creates an event structure
5937 * to quickly parse raw data for a given event.
5938 *
5939 * These files currently come from:
5940 *
5941 * /sys/kernel/debug/tracing/events/.../.../format
5942 */
5943 enum pevent_errno __pevent_parse_format(struct event_format **eventp,
5944 struct pevent *pevent, const char *buf,
5945 unsigned long size, const char *sys)
5946 {
5947 struct event_format *event;
5948 int ret;
5949
5950 init_input_buf(buf, size);
5951
5952 *eventp = event = alloc_event();
5953 if (!event)
5954 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5955
5956 event->name = event_read_name();
5957 if (!event->name) {
5958 /* Bad event? */
5959 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5960 goto event_alloc_failed;
5961 }
5962
5963 if (strcmp(sys, "ftrace") == 0) {
5964 event->flags |= EVENT_FL_ISFTRACE;
5965
5966 if (strcmp(event->name, "bprint") == 0)
5967 event->flags |= EVENT_FL_ISBPRINT;
5968 }
5969
5970 event->id = event_read_id();
5971 if (event->id < 0) {
5972 ret = PEVENT_ERRNO__READ_ID_FAILED;
5973 /*
5974 * This isn't an allocation error actually.
5975 * But as the ID is critical, just bail out.
5976 */
5977 goto event_alloc_failed;
5978 }
5979
5980 event->system = strdup(sys);
5981 if (!event->system) {
5982 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5983 goto event_alloc_failed;
5984 }
5985
5986 /* Add pevent to event so that it can be referenced */
5987 event->pevent = pevent;
5988
5989 ret = event_read_format(event);
5990 if (ret < 0) {
5991 ret = PEVENT_ERRNO__READ_FORMAT_FAILED;
5992 goto event_parse_failed;
5993 }
5994
5995 /*
5996 * If the event has an override, don't print warnings if the event
5997 * print format fails to parse.
5998 */
5999 if (pevent && find_event_handle(pevent, event))
6000 show_warning = 0;
6001
6002 ret = event_read_print(event);
6003 show_warning = 1;
6004
6005 if (ret < 0) {
6006 ret = PEVENT_ERRNO__READ_PRINT_FAILED;
6007 goto event_parse_failed;
6008 }
6009
6010 if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
6011 struct format_field *field;
6012 struct print_arg *arg, **list;
6013
6014 /* old ftrace had no args */
6015 list = &event->print_fmt.args;
6016 for (field = event->format.fields; field; field = field->next) {
6017 arg = alloc_arg();
6018 if (!arg) {
6019 event->flags |= EVENT_FL_FAILED;
6020 return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
6021 }
6022 arg->type = PRINT_FIELD;
6023 arg->field.name = strdup(field->name);
6024 if (!arg->field.name) {
6025 event->flags |= EVENT_FL_FAILED;
6026 free_arg(arg);
6027 return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
6028 }
6029 arg->field.field = field;
6030 *list = arg;
6031 list = &arg->next;
6032 }
6033 return 0;
6034 }
6035
6036 return 0;
6037
6038 event_parse_failed:
6039 event->flags |= EVENT_FL_FAILED;
6040 return ret;
6041
6042 event_alloc_failed:
6043 free(event->system);
6044 free(event->name);
6045 free(event);
6046 *eventp = NULL;
6047 return ret;
6048 }
6049
6050 static enum pevent_errno
6051 __pevent_parse_event(struct pevent *pevent,
6052 struct event_format **eventp,
6053 const char *buf, unsigned long size,
6054 const char *sys)
6055 {
6056 int ret = __pevent_parse_format(eventp, pevent, buf, size, sys);
6057 struct event_format *event = *eventp;
6058
6059 if (event == NULL)
6060 return ret;
6061
6062 if (pevent && add_event(pevent, event)) {
6063 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
6064 goto event_add_failed;
6065 }
6066
6067 #define PRINT_ARGS 0
6068 if (PRINT_ARGS && event->print_fmt.args)
6069 print_args(event->print_fmt.args);
6070
6071 return 0;
6072
6073 event_add_failed:
6074 pevent_free_format(event);
6075 return ret;
6076 }
6077
6078 /**
6079 * pevent_parse_format - parse the event format
6080 * @pevent: the handle to the pevent
6081 * @eventp: returned format
6082 * @buf: the buffer storing the event format string
6083 * @size: the size of @buf
6084 * @sys: the system the event belongs to
6085 *
6086 * This parses the event format and creates an event structure
6087 * to quickly parse raw data for a given event.
6088 *
6089 * These files currently come from:
6090 *
6091 * /sys/kernel/debug/tracing/events/.../.../format
6092 */
6093 enum pevent_errno pevent_parse_format(struct pevent *pevent,
6094 struct event_format **eventp,
6095 const char *buf,
6096 unsigned long size, const char *sys)
6097 {
6098 return __pevent_parse_event(pevent, eventp, buf, size, sys);
6099 }
6100
6101 /**
6102 * pevent_parse_event - parse the event format
6103 * @pevent: the handle to the pevent
6104 * @buf: the buffer storing the event format string
6105 * @size: the size of @buf
6106 * @sys: the system the event belongs to
6107 *
6108 * This parses the event format and creates an event structure
6109 * to quickly parse raw data for a given event.
6110 *
6111 * These files currently come from:
6112 *
6113 * /sys/kernel/debug/tracing/events/.../.../format
6114 */
6115 enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf,
6116 unsigned long size, const char *sys)
6117 {
6118 struct event_format *event = NULL;
6119 return __pevent_parse_event(pevent, &event, buf, size, sys);
6120 }
6121
6122 #undef _PE
6123 #define _PE(code, str) str
6124 static const char * const pevent_error_str[] = {
6125 PEVENT_ERRORS
6126 };
6127 #undef _PE
6128
6129 int pevent_strerror(struct pevent *pevent __maybe_unused,
6130 enum pevent_errno errnum, char *buf, size_t buflen)
6131 {
6132 int idx;
6133 const char *msg;
6134
6135 if (errnum >= 0) {
6136 str_error_r(errnum, buf, buflen);
6137 return 0;
6138 }
6139
6140 if (errnum <= __PEVENT_ERRNO__START ||
6141 errnum >= __PEVENT_ERRNO__END)
6142 return -1;
6143
6144 idx = errnum - __PEVENT_ERRNO__START - 1;
6145 msg = pevent_error_str[idx];
6146 snprintf(buf, buflen, "%s", msg);
6147
6148 return 0;
6149 }
6150
6151 int get_field_val(struct trace_seq *s, struct format_field *field,
6152 const char *name, struct pevent_record *record,
6153 unsigned long long *val, int err)
6154 {
6155 if (!field) {
6156 if (err)
6157 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
6158 return -1;
6159 }
6160
6161 if (pevent_read_number_field(field, record->data, val)) {
6162 if (err)
6163 trace_seq_printf(s, " %s=INVALID", name);
6164 return -1;
6165 }
6166
6167 return 0;
6168 }
6169
6170 /**
6171 * pevent_get_field_raw - return the raw pointer into the data field
6172 * @s: The seq to print to on error
6173 * @event: the event that the field is for
6174 * @name: The name of the field
6175 * @record: The record with the field name.
6176 * @len: place to store the field length.
6177 * @err: print default error if failed.
6178 *
6179 * Returns a pointer into record->data of the field and places
6180 * the length of the field in @len.
6181 *
6182 * On failure, it returns NULL.
6183 */
6184 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
6185 const char *name, struct pevent_record *record,
6186 int *len, int err)
6187 {
6188 struct format_field *field;
6189 void *data = record->data;
6190 unsigned offset;
6191 int dummy;
6192
6193 if (!event)
6194 return NULL;
6195
6196 field = pevent_find_field(event, name);
6197
6198 if (!field) {
6199 if (err)
6200 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
6201 return NULL;
6202 }
6203
6204 /* Allow @len to be NULL */
6205 if (!len)
6206 len = &dummy;
6207
6208 offset = field->offset;
6209 if (field->flags & FIELD_IS_DYNAMIC) {
6210 offset = pevent_read_number(event->pevent,
6211 data + offset, field->size);
6212 *len = offset >> 16;
6213 offset &= 0xffff;
6214 } else
6215 *len = field->size;
6216
6217 return data + offset;
6218 }
6219
6220 /**
6221 * pevent_get_field_val - find a field and return its value
6222 * @s: The seq to print to on error
6223 * @event: the event that the field is for
6224 * @name: The name of the field
6225 * @record: The record with the field name.
6226 * @val: place to store the value of the field.
6227 * @err: print default error if failed.
6228 *
6229 * Returns 0 on success -1 on field not found.
6230 */
6231 int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
6232 const char *name, struct pevent_record *record,
6233 unsigned long long *val, int err)
6234 {
6235 struct format_field *field;
6236
6237 if (!event)
6238 return -1;
6239
6240 field = pevent_find_field(event, name);
6241
6242 return get_field_val(s, field, name, record, val, err);
6243 }
6244
6245 /**
6246 * pevent_get_common_field_val - find a common field and return its value
6247 * @s: The seq to print to on error
6248 * @event: the event that the field is for
6249 * @name: The name of the field
6250 * @record: The record with the field name.
6251 * @val: place to store the value of the field.
6252 * @err: print default error if failed.
6253 *
6254 * Returns 0 on success -1 on field not found.
6255 */
6256 int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
6257 const char *name, struct pevent_record *record,
6258 unsigned long long *val, int err)
6259 {
6260 struct format_field *field;
6261
6262 if (!event)
6263 return -1;
6264
6265 field = pevent_find_common_field(event, name);
6266
6267 return get_field_val(s, field, name, record, val, err);
6268 }
6269
6270 /**
6271 * pevent_get_any_field_val - find a any field and return its value
6272 * @s: The seq to print to on error
6273 * @event: the event that the field is for
6274 * @name: The name of the field
6275 * @record: The record with the field name.
6276 * @val: place to store the value of the field.
6277 * @err: print default error if failed.
6278 *
6279 * Returns 0 on success -1 on field not found.
6280 */
6281 int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
6282 const char *name, struct pevent_record *record,
6283 unsigned long long *val, int err)
6284 {
6285 struct format_field *field;
6286
6287 if (!event)
6288 return -1;
6289
6290 field = pevent_find_any_field(event, name);
6291
6292 return get_field_val(s, field, name, record, val, err);
6293 }
6294
6295 /**
6296 * pevent_print_num_field - print a field and a format
6297 * @s: The seq to print to
6298 * @fmt: The printf format to print the field with.
6299 * @event: the event that the field is for
6300 * @name: The name of the field
6301 * @record: The record with the field name.
6302 * @err: print default error if failed.
6303 *
6304 * Returns: 0 on success, -1 field not found, or 1 if buffer is full.
6305 */
6306 int pevent_print_num_field(struct trace_seq *s, const char *fmt,
6307 struct event_format *event, const char *name,
6308 struct pevent_record *record, int err)
6309 {
6310 struct format_field *field = pevent_find_field(event, name);
6311 unsigned long long val;
6312
6313 if (!field)
6314 goto failed;
6315
6316 if (pevent_read_number_field(field, record->data, &val))
6317 goto failed;
6318
6319 return trace_seq_printf(s, fmt, val);
6320
6321 failed:
6322 if (err)
6323 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
6324 return -1;
6325 }
6326
6327 /**
6328 * pevent_print_func_field - print a field and a format for function pointers
6329 * @s: The seq to print to
6330 * @fmt: The printf format to print the field with.
6331 * @event: the event that the field is for
6332 * @name: The name of the field
6333 * @record: The record with the field name.
6334 * @err: print default error if failed.
6335 *
6336 * Returns: 0 on success, -1 field not found, or 1 if buffer is full.
6337 */
6338 int pevent_print_func_field(struct trace_seq *s, const char *fmt,
6339 struct event_format *event, const char *name,
6340 struct pevent_record *record, int err)
6341 {
6342 struct format_field *field = pevent_find_field(event, name);
6343 struct pevent *pevent = event->pevent;
6344 unsigned long long val;
6345 struct func_map *func;
6346 char tmp[128];
6347
6348 if (!field)
6349 goto failed;
6350
6351 if (pevent_read_number_field(field, record->data, &val))
6352 goto failed;
6353
6354 func = find_func(pevent, val);
6355
6356 if (func)
6357 snprintf(tmp, 128, "%s/0x%llx", func->func, func->addr - val);
6358 else
6359 sprintf(tmp, "0x%08llx", val);
6360
6361 return trace_seq_printf(s, fmt, tmp);
6362
6363 failed:
6364 if (err)
6365 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
6366 return -1;
6367 }
6368
6369 static void free_func_handle(struct pevent_function_handler *func)
6370 {
6371 struct pevent_func_params *params;
6372
6373 free(func->name);
6374
6375 while (func->params) {
6376 params = func->params;
6377 func->params = params->next;
6378 free(params);
6379 }
6380
6381 free(func);
6382 }
6383
6384 /**
6385 * pevent_register_print_function - register a helper function
6386 * @pevent: the handle to the pevent
6387 * @func: the function to process the helper function
6388 * @ret_type: the return type of the helper function
6389 * @name: the name of the helper function
6390 * @parameters: A list of enum pevent_func_arg_type
6391 *
6392 * Some events may have helper functions in the print format arguments.
6393 * This allows a plugin to dynamically create a way to process one
6394 * of these functions.
6395 *
6396 * The @parameters is a variable list of pevent_func_arg_type enums that
6397 * must end with PEVENT_FUNC_ARG_VOID.
6398 */
6399 int pevent_register_print_function(struct pevent *pevent,
6400 pevent_func_handler func,
6401 enum pevent_func_arg_type ret_type,
6402 char *name, ...)
6403 {
6404 struct pevent_function_handler *func_handle;
6405 struct pevent_func_params **next_param;
6406 struct pevent_func_params *param;
6407 enum pevent_func_arg_type type;
6408 va_list ap;
6409 int ret;
6410
6411 func_handle = find_func_handler(pevent, name);
6412 if (func_handle) {
6413 /*
6414 * This is most like caused by the users own
6415 * plugins updating the function. This overrides the
6416 * system defaults.
6417 */
6418 pr_stat("override of function helper '%s'", name);
6419 remove_func_handler(pevent, name);
6420 }
6421
6422 func_handle = calloc(1, sizeof(*func_handle));
6423 if (!func_handle) {
6424 do_warning("Failed to allocate function handler");
6425 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6426 }
6427
6428 func_handle->ret_type = ret_type;
6429 func_handle->name = strdup(name);
6430 func_handle->func = func;
6431 if (!func_handle->name) {
6432 do_warning("Failed to allocate function name");
6433 free(func_handle);
6434 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6435 }
6436
6437 next_param = &(func_handle->params);
6438 va_start(ap, name);
6439 for (;;) {
6440 type = va_arg(ap, enum pevent_func_arg_type);
6441 if (type == PEVENT_FUNC_ARG_VOID)
6442 break;
6443
6444 if (type >= PEVENT_FUNC_ARG_MAX_TYPES) {
6445 do_warning("Invalid argument type %d", type);
6446 ret = PEVENT_ERRNO__INVALID_ARG_TYPE;
6447 goto out_free;
6448 }
6449
6450 param = malloc(sizeof(*param));
6451 if (!param) {
6452 do_warning("Failed to allocate function param");
6453 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
6454 goto out_free;
6455 }
6456 param->type = type;
6457 param->next = NULL;
6458
6459 *next_param = param;
6460 next_param = &(param->next);
6461
6462 func_handle->nr_args++;
6463 }
6464 va_end(ap);
6465
6466 func_handle->next = pevent->func_handlers;
6467 pevent->func_handlers = func_handle;
6468
6469 return 0;
6470 out_free:
6471 va_end(ap);
6472 free_func_handle(func_handle);
6473 return ret;
6474 }
6475
6476 /**
6477 * pevent_unregister_print_function - unregister a helper function
6478 * @pevent: the handle to the pevent
6479 * @func: the function to process the helper function
6480 * @name: the name of the helper function
6481 *
6482 * This function removes existing print handler for function @name.
6483 *
6484 * Returns 0 if the handler was removed successully, -1 otherwise.
6485 */
6486 int pevent_unregister_print_function(struct pevent *pevent,
6487 pevent_func_handler func, char *name)
6488 {
6489 struct pevent_function_handler *func_handle;
6490
6491 func_handle = find_func_handler(pevent, name);
6492 if (func_handle && func_handle->func == func) {
6493 remove_func_handler(pevent, name);
6494 return 0;
6495 }
6496 return -1;
6497 }
6498
6499 static struct event_format *pevent_search_event(struct pevent *pevent, int id,
6500 const char *sys_name,
6501 const char *event_name)
6502 {
6503 struct event_format *event;
6504
6505 if (id >= 0) {
6506 /* search by id */
6507 event = pevent_find_event(pevent, id);
6508 if (!event)
6509 return NULL;
6510 if (event_name && (strcmp(event_name, event->name) != 0))
6511 return NULL;
6512 if (sys_name && (strcmp(sys_name, event->system) != 0))
6513 return NULL;
6514 } else {
6515 event = pevent_find_event_by_name(pevent, sys_name, event_name);
6516 if (!event)
6517 return NULL;
6518 }
6519 return event;
6520 }
6521
6522 /**
6523 * pevent_register_event_handler - register a way to parse an event
6524 * @pevent: the handle to the pevent
6525 * @id: the id of the event to register
6526 * @sys_name: the system name the event belongs to
6527 * @event_name: the name of the event
6528 * @func: the function to call to parse the event information
6529 * @context: the data to be passed to @func
6530 *
6531 * This function allows a developer to override the parsing of
6532 * a given event. If for some reason the default print format
6533 * is not sufficient, this function will register a function
6534 * for an event to be used to parse the data instead.
6535 *
6536 * If @id is >= 0, then it is used to find the event.
6537 * else @sys_name and @event_name are used.
6538 */
6539 int pevent_register_event_handler(struct pevent *pevent, int id,
6540 const char *sys_name, const char *event_name,
6541 pevent_event_handler_func func, void *context)
6542 {
6543 struct event_format *event;
6544 struct event_handler *handle;
6545
6546 event = pevent_search_event(pevent, id, sys_name, event_name);
6547 if (event == NULL)
6548 goto not_found;
6549
6550 pr_stat("overriding event (%d) %s:%s with new print handler",
6551 event->id, event->system, event->name);
6552
6553 event->handler = func;
6554 event->context = context;
6555 return 0;
6556
6557 not_found:
6558 /* Save for later use. */
6559 handle = calloc(1, sizeof(*handle));
6560 if (!handle) {
6561 do_warning("Failed to allocate event handler");
6562 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6563 }
6564
6565 handle->id = id;
6566 if (event_name)
6567 handle->event_name = strdup(event_name);
6568 if (sys_name)
6569 handle->sys_name = strdup(sys_name);
6570
6571 if ((event_name && !handle->event_name) ||
6572 (sys_name && !handle->sys_name)) {
6573 do_warning("Failed to allocate event/sys name");
6574 free((void *)handle->event_name);
6575 free((void *)handle->sys_name);
6576 free(handle);
6577 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6578 }
6579
6580 handle->func = func;
6581 handle->next = pevent->handlers;
6582 pevent->handlers = handle;
6583 handle->context = context;
6584
6585 return -1;
6586 }
6587
6588 static int handle_matches(struct event_handler *handler, int id,
6589 const char *sys_name, const char *event_name,
6590 pevent_event_handler_func func, void *context)
6591 {
6592 if (id >= 0 && id != handler->id)
6593 return 0;
6594
6595 if (event_name && (strcmp(event_name, handler->event_name) != 0))
6596 return 0;
6597
6598 if (sys_name && (strcmp(sys_name, handler->sys_name) != 0))
6599 return 0;
6600
6601 if (func != handler->func || context != handler->context)
6602 return 0;
6603
6604 return 1;
6605 }
6606
6607 /**
6608 * pevent_unregister_event_handler - unregister an existing event handler
6609 * @pevent: the handle to the pevent
6610 * @id: the id of the event to unregister
6611 * @sys_name: the system name the handler belongs to
6612 * @event_name: the name of the event handler
6613 * @func: the function to call to parse the event information
6614 * @context: the data to be passed to @func
6615 *
6616 * This function removes existing event handler (parser).
6617 *
6618 * If @id is >= 0, then it is used to find the event.
6619 * else @sys_name and @event_name are used.
6620 *
6621 * Returns 0 if handler was removed successfully, -1 if event was not found.
6622 */
6623 int pevent_unregister_event_handler(struct pevent *pevent, int id,
6624 const char *sys_name, const char *event_name,
6625 pevent_event_handler_func func, void *context)
6626 {
6627 struct event_format *event;
6628 struct event_handler *handle;
6629 struct event_handler **next;
6630
6631 event = pevent_search_event(pevent, id, sys_name, event_name);
6632 if (event == NULL)
6633 goto not_found;
6634
6635 if (event->handler == func && event->context == context) {
6636 pr_stat("removing override handler for event (%d) %s:%s. Going back to default handler.",
6637 event->id, event->system, event->name);
6638
6639 event->handler = NULL;
6640 event->context = NULL;
6641 return 0;
6642 }
6643
6644 not_found:
6645 for (next = &pevent->handlers; *next; next = &(*next)->next) {
6646 handle = *next;
6647 if (handle_matches(handle, id, sys_name, event_name,
6648 func, context))
6649 break;
6650 }
6651
6652 if (!(*next))
6653 return -1;
6654
6655 *next = handle->next;
6656 free_handler(handle);
6657
6658 return 0;
6659 }
6660
6661 /**
6662 * pevent_alloc - create a pevent handle
6663 */
6664 struct pevent *pevent_alloc(void)
6665 {
6666 struct pevent *pevent = calloc(1, sizeof(*pevent));
6667
6668 if (pevent)
6669 pevent->ref_count = 1;
6670
6671 return pevent;
6672 }
6673
6674 void pevent_ref(struct pevent *pevent)
6675 {
6676 pevent->ref_count++;
6677 }
6678
6679 void pevent_free_format_field(struct format_field *field)
6680 {
6681 free(field->type);
6682 if (field->alias != field->name)
6683 free(field->alias);
6684 free(field->name);
6685 free(field);
6686 }
6687
6688 static void free_format_fields(struct format_field *field)
6689 {
6690 struct format_field *next;
6691
6692 while (field) {
6693 next = field->next;
6694 pevent_free_format_field(field);
6695 field = next;
6696 }
6697 }
6698
6699 static void free_formats(struct format *format)
6700 {
6701 free_format_fields(format->common_fields);
6702 free_format_fields(format->fields);
6703 }
6704
6705 void pevent_free_format(struct event_format *event)
6706 {
6707 free(event->name);
6708 free(event->system);
6709
6710 free_formats(&event->format);
6711
6712 free(event->print_fmt.format);
6713 free_args(event->print_fmt.args);
6714
6715 free(event);
6716 }
6717
6718 /**
6719 * pevent_free - free a pevent handle
6720 * @pevent: the pevent handle to free
6721 */
6722 void pevent_free(struct pevent *pevent)
6723 {
6724 struct cmdline_list *cmdlist, *cmdnext;
6725 struct func_list *funclist, *funcnext;
6726 struct printk_list *printklist, *printknext;
6727 struct pevent_function_handler *func_handler;
6728 struct event_handler *handle;
6729 int i;
6730
6731 if (!pevent)
6732 return;
6733
6734 cmdlist = pevent->cmdlist;
6735 funclist = pevent->funclist;
6736 printklist = pevent->printklist;
6737
6738 pevent->ref_count--;
6739 if (pevent->ref_count)
6740 return;
6741
6742 if (pevent->cmdlines) {
6743 for (i = 0; i < pevent->cmdline_count; i++)
6744 free(pevent->cmdlines[i].comm);
6745 free(pevent->cmdlines);
6746 }
6747
6748 while (cmdlist) {
6749 cmdnext = cmdlist->next;
6750 free(cmdlist->comm);
6751 free(cmdlist);
6752 cmdlist = cmdnext;
6753 }
6754
6755 if (pevent->func_map) {
6756 for (i = 0; i < (int)pevent->func_count; i++) {
6757 free(pevent->func_map[i].func);
6758 free(pevent->func_map[i].mod);
6759 }
6760 free(pevent->func_map);
6761 }
6762
6763 while (funclist) {
6764 funcnext = funclist->next;
6765 free(funclist->func);
6766 free(funclist->mod);
6767 free(funclist);
6768 funclist = funcnext;
6769 }
6770
6771 while (pevent->func_handlers) {
6772 func_handler = pevent->func_handlers;
6773 pevent->func_handlers = func_handler->next;
6774 free_func_handle(func_handler);
6775 }
6776
6777 if (pevent->printk_map) {
6778 for (i = 0; i < (int)pevent->printk_count; i++)
6779 free(pevent->printk_map[i].printk);
6780 free(pevent->printk_map);
6781 }
6782
6783 while (printklist) {
6784 printknext = printklist->next;
6785 free(printklist->printk);
6786 free(printklist);
6787 printklist = printknext;
6788 }
6789
6790 for (i = 0; i < pevent->nr_events; i++)
6791 pevent_free_format(pevent->events[i]);
6792
6793 while (pevent->handlers) {
6794 handle = pevent->handlers;
6795 pevent->handlers = handle->next;
6796 free_handler(handle);
6797 }
6798
6799 free(pevent->trace_clock);
6800 free(pevent->events);
6801 free(pevent->sort_events);
6802 free(pevent->func_resolver);
6803
6804 free(pevent);
6805 }
6806
6807 void pevent_unref(struct pevent *pevent)
6808 {
6809 pevent_free(pevent);
6810 }
Linux with added FPC-III support