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parse-events: Handle invalid opcode parsing gracefully
[deliverable/linux.git] / tools / lib / traceevent / event-parse.c
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, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 *
21 * The parts for function graph printing was taken and modified from the
22 * Linux Kernel that were written by
23 * - Copyright (C) 2009 Frederic Weisbecker,
24 * Frederic Weisbecker gave his permission to relicense the code to
25 * the Lesser General Public License.
26 */
27 #define _GNU_SOURCE
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <stdarg.h>
32 #include <ctype.h>
33 #include <errno.h>
34
35 #include "event-parse.h"
36 #include "event-utils.h"
37
38 static const char *input_buf;
39 static unsigned long long input_buf_ptr;
40 static unsigned long long input_buf_siz;
41
42 static int is_flag_field;
43 static int is_symbolic_field;
44
45 static int show_warning = 1;
46
47 #define do_warning(fmt, ...) \
48 do { \
49 if (show_warning) \
50 warning(fmt, ##__VA_ARGS__); \
51 } while (0)
52
53 static void init_input_buf(const char *buf, unsigned long long size)
54 {
55 input_buf = buf;
56 input_buf_siz = size;
57 input_buf_ptr = 0;
58 }
59
60 const char *pevent_get_input_buf(void)
61 {
62 return input_buf;
63 }
64
65 unsigned long long pevent_get_input_buf_ptr(void)
66 {
67 return input_buf_ptr;
68 }
69
70 struct event_handler {
71 struct event_handler *next;
72 int id;
73 const char *sys_name;
74 const char *event_name;
75 pevent_event_handler_func func;
76 void *context;
77 };
78
79 struct pevent_func_params {
80 struct pevent_func_params *next;
81 enum pevent_func_arg_type type;
82 };
83
84 struct pevent_function_handler {
85 struct pevent_function_handler *next;
86 enum pevent_func_arg_type ret_type;
87 char *name;
88 pevent_func_handler func;
89 struct pevent_func_params *params;
90 int nr_args;
91 };
92
93 static unsigned long long
94 process_defined_func(struct trace_seq *s, void *data, int size,
95 struct event_format *event, struct print_arg *arg);
96
97 static void free_func_handle(struct pevent_function_handler *func);
98
99 /**
100 * pevent_buffer_init - init buffer for parsing
101 * @buf: buffer to parse
102 * @size: the size of the buffer
103 *
104 * For use with pevent_read_token(), this initializes the internal
105 * buffer that pevent_read_token() will parse.
106 */
107 void pevent_buffer_init(const char *buf, unsigned long long size)
108 {
109 init_input_buf(buf, size);
110 }
111
112 void breakpoint(void)
113 {
114 static int x;
115 x++;
116 }
117
118 struct print_arg *alloc_arg(void)
119 {
120 struct print_arg *arg;
121
122 arg = malloc_or_die(sizeof(*arg));
123 if (!arg)
124 return NULL;
125 memset(arg, 0, sizeof(*arg));
126
127 return arg;
128 }
129
130 struct cmdline {
131 char *comm;
132 int pid;
133 };
134
135 static int cmdline_cmp(const void *a, const void *b)
136 {
137 const struct cmdline *ca = a;
138 const struct cmdline *cb = b;
139
140 if (ca->pid < cb->pid)
141 return -1;
142 if (ca->pid > cb->pid)
143 return 1;
144
145 return 0;
146 }
147
148 struct cmdline_list {
149 struct cmdline_list *next;
150 char *comm;
151 int pid;
152 };
153
154 static int cmdline_init(struct pevent *pevent)
155 {
156 struct cmdline_list *cmdlist = pevent->cmdlist;
157 struct cmdline_list *item;
158 struct cmdline *cmdlines;
159 int i;
160
161 cmdlines = malloc_or_die(sizeof(*cmdlines) * pevent->cmdline_count);
162
163 i = 0;
164 while (cmdlist) {
165 cmdlines[i].pid = cmdlist->pid;
166 cmdlines[i].comm = cmdlist->comm;
167 i++;
168 item = cmdlist;
169 cmdlist = cmdlist->next;
170 free(item);
171 }
172
173 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
174
175 pevent->cmdlines = cmdlines;
176 pevent->cmdlist = NULL;
177
178 return 0;
179 }
180
181 static char *find_cmdline(struct pevent *pevent, int pid)
182 {
183 const struct cmdline *comm;
184 struct cmdline key;
185
186 if (!pid)
187 return "<idle>";
188
189 if (!pevent->cmdlines)
190 cmdline_init(pevent);
191
192 key.pid = pid;
193
194 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
195 sizeof(*pevent->cmdlines), cmdline_cmp);
196
197 if (comm)
198 return comm->comm;
199 return "<...>";
200 }
201
202 /**
203 * pevent_pid_is_registered - return if a pid has a cmdline registered
204 * @pevent: handle for the pevent
205 * @pid: The pid to check if it has a cmdline registered with.
206 *
207 * Returns 1 if the pid has a cmdline mapped to it
208 * 0 otherwise.
209 */
210 int pevent_pid_is_registered(struct pevent *pevent, int pid)
211 {
212 const struct cmdline *comm;
213 struct cmdline key;
214
215 if (!pid)
216 return 1;
217
218 if (!pevent->cmdlines)
219 cmdline_init(pevent);
220
221 key.pid = pid;
222
223 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
224 sizeof(*pevent->cmdlines), cmdline_cmp);
225
226 if (comm)
227 return 1;
228 return 0;
229 }
230
231 /*
232 * If the command lines have been converted to an array, then
233 * we must add this pid. This is much slower than when cmdlines
234 * are added before the array is initialized.
235 */
236 static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
237 {
238 struct cmdline *cmdlines = pevent->cmdlines;
239 const struct cmdline *cmdline;
240 struct cmdline key;
241
242 if (!pid)
243 return 0;
244
245 /* avoid duplicates */
246 key.pid = pid;
247
248 cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
249 sizeof(*pevent->cmdlines), cmdline_cmp);
250 if (cmdline) {
251 errno = EEXIST;
252 return -1;
253 }
254
255 cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
256 if (!cmdlines) {
257 errno = ENOMEM;
258 return -1;
259 }
260
261 cmdlines[pevent->cmdline_count].pid = pid;
262 cmdlines[pevent->cmdline_count].comm = strdup(comm);
263 if (!cmdlines[pevent->cmdline_count].comm)
264 die("malloc comm");
265
266 if (cmdlines[pevent->cmdline_count].comm)
267 pevent->cmdline_count++;
268
269 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
270 pevent->cmdlines = cmdlines;
271
272 return 0;
273 }
274
275 /**
276 * pevent_register_comm - register a pid / comm mapping
277 * @pevent: handle for the pevent
278 * @comm: the command line to register
279 * @pid: the pid to map the command line to
280 *
281 * This adds a mapping to search for command line names with
282 * a given pid. The comm is duplicated.
283 */
284 int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
285 {
286 struct cmdline_list *item;
287
288 if (pevent->cmdlines)
289 return add_new_comm(pevent, comm, pid);
290
291 item = malloc_or_die(sizeof(*item));
292 item->comm = strdup(comm);
293 if (!item->comm)
294 die("malloc comm");
295 item->pid = pid;
296 item->next = pevent->cmdlist;
297
298 pevent->cmdlist = item;
299 pevent->cmdline_count++;
300
301 return 0;
302 }
303
304 struct func_map {
305 unsigned long long addr;
306 char *func;
307 char *mod;
308 };
309
310 struct func_list {
311 struct func_list *next;
312 unsigned long long addr;
313 char *func;
314 char *mod;
315 };
316
317 static int func_cmp(const void *a, const void *b)
318 {
319 const struct func_map *fa = a;
320 const struct func_map *fb = b;
321
322 if (fa->addr < fb->addr)
323 return -1;
324 if (fa->addr > fb->addr)
325 return 1;
326
327 return 0;
328 }
329
330 /*
331 * We are searching for a record in between, not an exact
332 * match.
333 */
334 static int func_bcmp(const void *a, const void *b)
335 {
336 const struct func_map *fa = a;
337 const struct func_map *fb = b;
338
339 if ((fa->addr == fb->addr) ||
340
341 (fa->addr > fb->addr &&
342 fa->addr < (fb+1)->addr))
343 return 0;
344
345 if (fa->addr < fb->addr)
346 return -1;
347
348 return 1;
349 }
350
351 static int func_map_init(struct pevent *pevent)
352 {
353 struct func_list *funclist;
354 struct func_list *item;
355 struct func_map *func_map;
356 int i;
357
358 func_map = malloc_or_die(sizeof(*func_map) * (pevent->func_count + 1));
359 funclist = pevent->funclist;
360
361 i = 0;
362 while (funclist) {
363 func_map[i].func = funclist->func;
364 func_map[i].addr = funclist->addr;
365 func_map[i].mod = funclist->mod;
366 i++;
367 item = funclist;
368 funclist = funclist->next;
369 free(item);
370 }
371
372 qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
373
374 /*
375 * Add a special record at the end.
376 */
377 func_map[pevent->func_count].func = NULL;
378 func_map[pevent->func_count].addr = 0;
379 func_map[pevent->func_count].mod = NULL;
380
381 pevent->func_map = func_map;
382 pevent->funclist = NULL;
383
384 return 0;
385 }
386
387 static struct func_map *
388 find_func(struct pevent *pevent, unsigned long long addr)
389 {
390 struct func_map *func;
391 struct func_map key;
392
393 if (!pevent->func_map)
394 func_map_init(pevent);
395
396 key.addr = addr;
397
398 func = bsearch(&key, pevent->func_map, pevent->func_count,
399 sizeof(*pevent->func_map), func_bcmp);
400
401 return func;
402 }
403
404 /**
405 * pevent_find_function - find a function by a given address
406 * @pevent: handle for the pevent
407 * @addr: the address to find the function with
408 *
409 * Returns a pointer to the function stored that has the given
410 * address. Note, the address does not have to be exact, it
411 * will select the function that would contain the address.
412 */
413 const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
414 {
415 struct func_map *map;
416
417 map = find_func(pevent, addr);
418 if (!map)
419 return NULL;
420
421 return map->func;
422 }
423
424 /**
425 * pevent_find_function_address - find a function address by a given address
426 * @pevent: handle for the pevent
427 * @addr: the address to find the function with
428 *
429 * Returns the address the function starts at. This can be used in
430 * conjunction with pevent_find_function to print both the function
431 * name and the function offset.
432 */
433 unsigned long long
434 pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
435 {
436 struct func_map *map;
437
438 map = find_func(pevent, addr);
439 if (!map)
440 return 0;
441
442 return map->addr;
443 }
444
445 /**
446 * pevent_register_function - register a function with a given address
447 * @pevent: handle for the pevent
448 * @function: the function name to register
449 * @addr: the address the function starts at
450 * @mod: the kernel module the function may be in (NULL for none)
451 *
452 * This registers a function name with an address and module.
453 * The @func passed in is duplicated.
454 */
455 int pevent_register_function(struct pevent *pevent, char *func,
456 unsigned long long addr, char *mod)
457 {
458 struct func_list *item;
459
460 item = malloc_or_die(sizeof(*item));
461
462 item->next = pevent->funclist;
463 item->func = strdup(func);
464 if (mod)
465 item->mod = strdup(mod);
466 else
467 item->mod = NULL;
468 item->addr = addr;
469
470 pevent->funclist = item;
471
472 pevent->func_count++;
473
474 return 0;
475 }
476
477 /**
478 * pevent_print_funcs - print out the stored functions
479 * @pevent: handle for the pevent
480 *
481 * This prints out the stored functions.
482 */
483 void pevent_print_funcs(struct pevent *pevent)
484 {
485 int i;
486
487 if (!pevent->func_map)
488 func_map_init(pevent);
489
490 for (i = 0; i < (int)pevent->func_count; i++) {
491 printf("%016llx %s",
492 pevent->func_map[i].addr,
493 pevent->func_map[i].func);
494 if (pevent->func_map[i].mod)
495 printf(" [%s]\n", pevent->func_map[i].mod);
496 else
497 printf("\n");
498 }
499 }
500
501 struct printk_map {
502 unsigned long long addr;
503 char *printk;
504 };
505
506 struct printk_list {
507 struct printk_list *next;
508 unsigned long long addr;
509 char *printk;
510 };
511
512 static int printk_cmp(const void *a, const void *b)
513 {
514 const struct func_map *fa = a;
515 const struct func_map *fb = b;
516
517 if (fa->addr < fb->addr)
518 return -1;
519 if (fa->addr > fb->addr)
520 return 1;
521
522 return 0;
523 }
524
525 static void printk_map_init(struct pevent *pevent)
526 {
527 struct printk_list *printklist;
528 struct printk_list *item;
529 struct printk_map *printk_map;
530 int i;
531
532 printk_map = malloc_or_die(sizeof(*printk_map) * (pevent->printk_count + 1));
533
534 printklist = pevent->printklist;
535
536 i = 0;
537 while (printklist) {
538 printk_map[i].printk = printklist->printk;
539 printk_map[i].addr = printklist->addr;
540 i++;
541 item = printklist;
542 printklist = printklist->next;
543 free(item);
544 }
545
546 qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
547
548 pevent->printk_map = printk_map;
549 pevent->printklist = NULL;
550 }
551
552 static struct printk_map *
553 find_printk(struct pevent *pevent, unsigned long long addr)
554 {
555 struct printk_map *printk;
556 struct printk_map key;
557
558 if (!pevent->printk_map)
559 printk_map_init(pevent);
560
561 key.addr = addr;
562
563 printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
564 sizeof(*pevent->printk_map), printk_cmp);
565
566 return printk;
567 }
568
569 /**
570 * pevent_register_print_string - register a string by its address
571 * @pevent: handle for the pevent
572 * @fmt: the string format to register
573 * @addr: the address the string was located at
574 *
575 * This registers a string by the address it was stored in the kernel.
576 * The @fmt passed in is duplicated.
577 */
578 int pevent_register_print_string(struct pevent *pevent, char *fmt,
579 unsigned long long addr)
580 {
581 struct printk_list *item;
582
583 item = malloc_or_die(sizeof(*item));
584
585 item->next = pevent->printklist;
586 pevent->printklist = item;
587 item->printk = strdup(fmt);
588 item->addr = addr;
589
590 pevent->printk_count++;
591
592 return 0;
593 }
594
595 /**
596 * pevent_print_printk - print out the stored strings
597 * @pevent: handle for the pevent
598 *
599 * This prints the string formats that were stored.
600 */
601 void pevent_print_printk(struct pevent *pevent)
602 {
603 int i;
604
605 if (!pevent->printk_map)
606 printk_map_init(pevent);
607
608 for (i = 0; i < (int)pevent->printk_count; i++) {
609 printf("%016llx %s\n",
610 pevent->printk_map[i].addr,
611 pevent->printk_map[i].printk);
612 }
613 }
614
615 static struct event_format *alloc_event(void)
616 {
617 struct event_format *event;
618
619 event = malloc_or_die(sizeof(*event));
620 memset(event, 0, sizeof(*event));
621
622 return event;
623 }
624
625 static void add_event(struct pevent *pevent, struct event_format *event)
626 {
627 int i;
628
629 if (!pevent->events)
630 pevent->events = malloc_or_die(sizeof(event));
631 else
632 pevent->events =
633 realloc(pevent->events, sizeof(event) *
634 (pevent->nr_events + 1));
635 if (!pevent->events)
636 die("Can not allocate events");
637
638 for (i = 0; i < pevent->nr_events; i++) {
639 if (pevent->events[i]->id > event->id)
640 break;
641 }
642 if (i < pevent->nr_events)
643 memmove(&pevent->events[i + 1],
644 &pevent->events[i],
645 sizeof(event) * (pevent->nr_events - i));
646
647 pevent->events[i] = event;
648 pevent->nr_events++;
649
650 event->pevent = pevent;
651 }
652
653 static int event_item_type(enum event_type type)
654 {
655 switch (type) {
656 case EVENT_ITEM ... EVENT_SQUOTE:
657 return 1;
658 case EVENT_ERROR ... EVENT_DELIM:
659 default:
660 return 0;
661 }
662 }
663
664 static void free_flag_sym(struct print_flag_sym *fsym)
665 {
666 struct print_flag_sym *next;
667
668 while (fsym) {
669 next = fsym->next;
670 free(fsym->value);
671 free(fsym->str);
672 free(fsym);
673 fsym = next;
674 }
675 }
676
677 static void free_arg(struct print_arg *arg)
678 {
679 struct print_arg *farg;
680
681 if (!arg)
682 return;
683
684 switch (arg->type) {
685 case PRINT_ATOM:
686 free(arg->atom.atom);
687 break;
688 case PRINT_FIELD:
689 free(arg->field.name);
690 break;
691 case PRINT_FLAGS:
692 free_arg(arg->flags.field);
693 free(arg->flags.delim);
694 free_flag_sym(arg->flags.flags);
695 break;
696 case PRINT_SYMBOL:
697 free_arg(arg->symbol.field);
698 free_flag_sym(arg->symbol.symbols);
699 break;
700 case PRINT_TYPE:
701 free(arg->typecast.type);
702 free_arg(arg->typecast.item);
703 break;
704 case PRINT_STRING:
705 case PRINT_BSTRING:
706 free(arg->string.string);
707 break;
708 case PRINT_DYNAMIC_ARRAY:
709 free(arg->dynarray.index);
710 break;
711 case PRINT_OP:
712 free(arg->op.op);
713 free_arg(arg->op.left);
714 free_arg(arg->op.right);
715 break;
716 case PRINT_FUNC:
717 while (arg->func.args) {
718 farg = arg->func.args;
719 arg->func.args = farg->next;
720 free_arg(farg);
721 }
722 break;
723
724 case PRINT_NULL:
725 default:
726 break;
727 }
728
729 free(arg);
730 }
731
732 static enum event_type get_type(int ch)
733 {
734 if (ch == '\n')
735 return EVENT_NEWLINE;
736 if (isspace(ch))
737 return EVENT_SPACE;
738 if (isalnum(ch) || ch == '_')
739 return EVENT_ITEM;
740 if (ch == '\'')
741 return EVENT_SQUOTE;
742 if (ch == '"')
743 return EVENT_DQUOTE;
744 if (!isprint(ch))
745 return EVENT_NONE;
746 if (ch == '(' || ch == ')' || ch == ',')
747 return EVENT_DELIM;
748
749 return EVENT_OP;
750 }
751
752 static int __read_char(void)
753 {
754 if (input_buf_ptr >= input_buf_siz)
755 return -1;
756
757 return input_buf[input_buf_ptr++];
758 }
759
760 static int __peek_char(void)
761 {
762 if (input_buf_ptr >= input_buf_siz)
763 return -1;
764
765 return input_buf[input_buf_ptr];
766 }
767
768 /**
769 * pevent_peek_char - peek at the next character that will be read
770 *
771 * Returns the next character read, or -1 if end of buffer.
772 */
773 int pevent_peek_char(void)
774 {
775 return __peek_char();
776 }
777
778 static enum event_type force_token(const char *str, char **tok);
779
780 static enum event_type __read_token(char **tok)
781 {
782 char buf[BUFSIZ];
783 int ch, last_ch, quote_ch, next_ch;
784 int i = 0;
785 int tok_size = 0;
786 enum event_type type;
787
788 *tok = NULL;
789
790
791 ch = __read_char();
792 if (ch < 0)
793 return EVENT_NONE;
794
795 type = get_type(ch);
796 if (type == EVENT_NONE)
797 return type;
798
799 buf[i++] = ch;
800
801 switch (type) {
802 case EVENT_NEWLINE:
803 case EVENT_DELIM:
804 *tok = malloc_or_die(2);
805 (*tok)[0] = ch;
806 (*tok)[1] = 0;
807 return type;
808
809 case EVENT_OP:
810 switch (ch) {
811 case '-':
812 next_ch = __peek_char();
813 if (next_ch == '>') {
814 buf[i++] = __read_char();
815 break;
816 }
817 /* fall through */
818 case '+':
819 case '|':
820 case '&':
821 case '>':
822 case '<':
823 last_ch = ch;
824 ch = __peek_char();
825 if (ch != last_ch)
826 goto test_equal;
827 buf[i++] = __read_char();
828 switch (last_ch) {
829 case '>':
830 case '<':
831 goto test_equal;
832 default:
833 break;
834 }
835 break;
836 case '!':
837 case '=':
838 goto test_equal;
839 default: /* what should we do instead? */
840 break;
841 }
842 buf[i] = 0;
843 *tok = strdup(buf);
844 return type;
845
846 test_equal:
847 ch = __peek_char();
848 if (ch == '=')
849 buf[i++] = __read_char();
850 goto out;
851
852 case EVENT_DQUOTE:
853 case EVENT_SQUOTE:
854 /* don't keep quotes */
855 i--;
856 quote_ch = ch;
857 last_ch = 0;
858 concat:
859 do {
860 if (i == (BUFSIZ - 1)) {
861 buf[i] = 0;
862 if (*tok) {
863 *tok = realloc(*tok, tok_size + BUFSIZ);
864 if (!*tok)
865 return EVENT_NONE;
866 strcat(*tok, buf);
867 } else
868 *tok = strdup(buf);
869
870 if (!*tok)
871 return EVENT_NONE;
872 tok_size += BUFSIZ;
873 i = 0;
874 }
875 last_ch = ch;
876 ch = __read_char();
877 buf[i++] = ch;
878 /* the '\' '\' will cancel itself */
879 if (ch == '\\' && last_ch == '\\')
880 last_ch = 0;
881 } while (ch != quote_ch || last_ch == '\\');
882 /* remove the last quote */
883 i--;
884
885 /*
886 * For strings (double quotes) check the next token.
887 * If it is another string, concatinate the two.
888 */
889 if (type == EVENT_DQUOTE) {
890 unsigned long long save_input_buf_ptr = input_buf_ptr;
891
892 do {
893 ch = __read_char();
894 } while (isspace(ch));
895 if (ch == '"')
896 goto concat;
897 input_buf_ptr = save_input_buf_ptr;
898 }
899
900 goto out;
901
902 case EVENT_ERROR ... EVENT_SPACE:
903 case EVENT_ITEM:
904 default:
905 break;
906 }
907
908 while (get_type(__peek_char()) == type) {
909 if (i == (BUFSIZ - 1)) {
910 buf[i] = 0;
911 if (*tok) {
912 *tok = realloc(*tok, tok_size + BUFSIZ);
913 if (!*tok)
914 return EVENT_NONE;
915 strcat(*tok, buf);
916 } else
917 *tok = strdup(buf);
918
919 if (!*tok)
920 return EVENT_NONE;
921 tok_size += BUFSIZ;
922 i = 0;
923 }
924 ch = __read_char();
925 buf[i++] = ch;
926 }
927
928 out:
929 buf[i] = 0;
930 if (*tok) {
931 *tok = realloc(*tok, tok_size + i);
932 if (!*tok)
933 return EVENT_NONE;
934 strcat(*tok, buf);
935 } else
936 *tok = strdup(buf);
937 if (!*tok)
938 return EVENT_NONE;
939
940 if (type == EVENT_ITEM) {
941 /*
942 * Older versions of the kernel has a bug that
943 * creates invalid symbols and will break the mac80211
944 * parsing. This is a work around to that bug.
945 *
946 * See Linux kernel commit:
947 * 811cb50baf63461ce0bdb234927046131fc7fa8b
948 */
949 if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
950 free(*tok);
951 *tok = NULL;
952 return force_token("\"\%s\" ", tok);
953 } else if (strcmp(*tok, "STA_PR_FMT") == 0) {
954 free(*tok);
955 *tok = NULL;
956 return force_token("\" sta:%pM\" ", tok);
957 } else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
958 free(*tok);
959 *tok = NULL;
960 return force_token("\" vif:%p(%d)\" ", tok);
961 }
962 }
963
964 return type;
965 }
966
967 static enum event_type force_token(const char *str, char **tok)
968 {
969 const char *save_input_buf;
970 unsigned long long save_input_buf_ptr;
971 unsigned long long save_input_buf_siz;
972 enum event_type type;
973
974 /* save off the current input pointers */
975 save_input_buf = input_buf;
976 save_input_buf_ptr = input_buf_ptr;
977 save_input_buf_siz = input_buf_siz;
978
979 init_input_buf(str, strlen(str));
980
981 type = __read_token(tok);
982
983 /* reset back to original token */
984 input_buf = save_input_buf;
985 input_buf_ptr = save_input_buf_ptr;
986 input_buf_siz = save_input_buf_siz;
987
988 return type;
989 }
990
991 static void free_token(char *tok)
992 {
993 if (tok)
994 free(tok);
995 }
996
997 static enum event_type read_token(char **tok)
998 {
999 enum event_type type;
1000
1001 for (;;) {
1002 type = __read_token(tok);
1003 if (type != EVENT_SPACE)
1004 return type;
1005
1006 free_token(*tok);
1007 }
1008
1009 /* not reached */
1010 *tok = NULL;
1011 return EVENT_NONE;
1012 }
1013
1014 /**
1015 * pevent_read_token - access to utilites to use the pevent parser
1016 * @tok: The token to return
1017 *
1018 * This will parse tokens from the string given by
1019 * pevent_init_data().
1020 *
1021 * Returns the token type.
1022 */
1023 enum event_type pevent_read_token(char **tok)
1024 {
1025 return read_token(tok);
1026 }
1027
1028 /**
1029 * pevent_free_token - free a token returned by pevent_read_token
1030 * @token: the token to free
1031 */
1032 void pevent_free_token(char *token)
1033 {
1034 free_token(token);
1035 }
1036
1037 /* no newline */
1038 static enum event_type read_token_item(char **tok)
1039 {
1040 enum event_type type;
1041
1042 for (;;) {
1043 type = __read_token(tok);
1044 if (type != EVENT_SPACE && type != EVENT_NEWLINE)
1045 return type;
1046 free_token(*tok);
1047 *tok = NULL;
1048 }
1049
1050 /* not reached */
1051 *tok = NULL;
1052 return EVENT_NONE;
1053 }
1054
1055 static int test_type(enum event_type type, enum event_type expect)
1056 {
1057 if (type != expect) {
1058 do_warning("Error: expected type %d but read %d",
1059 expect, type);
1060 return -1;
1061 }
1062 return 0;
1063 }
1064
1065 static int test_type_token(enum event_type type, const char *token,
1066 enum event_type expect, const char *expect_tok)
1067 {
1068 if (type != expect) {
1069 do_warning("Error: expected type %d but read %d",
1070 expect, type);
1071 return -1;
1072 }
1073
1074 if (strcmp(token, expect_tok) != 0) {
1075 do_warning("Error: expected '%s' but read '%s'",
1076 expect_tok, token);
1077 return -1;
1078 }
1079 return 0;
1080 }
1081
1082 static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
1083 {
1084 enum event_type type;
1085
1086 if (newline_ok)
1087 type = read_token(tok);
1088 else
1089 type = read_token_item(tok);
1090 return test_type(type, expect);
1091 }
1092
1093 static int read_expect_type(enum event_type expect, char **tok)
1094 {
1095 return __read_expect_type(expect, tok, 1);
1096 }
1097
1098 static int __read_expected(enum event_type expect, const char *str,
1099 int newline_ok)
1100 {
1101 enum event_type type;
1102 char *token;
1103 int ret;
1104
1105 if (newline_ok)
1106 type = read_token(&token);
1107 else
1108 type = read_token_item(&token);
1109
1110 ret = test_type_token(type, token, expect, str);
1111
1112 free_token(token);
1113
1114 return ret;
1115 }
1116
1117 static int read_expected(enum event_type expect, const char *str)
1118 {
1119 return __read_expected(expect, str, 1);
1120 }
1121
1122 static int read_expected_item(enum event_type expect, const char *str)
1123 {
1124 return __read_expected(expect, str, 0);
1125 }
1126
1127 static char *event_read_name(void)
1128 {
1129 char *token;
1130
1131 if (read_expected(EVENT_ITEM, "name") < 0)
1132 return NULL;
1133
1134 if (read_expected(EVENT_OP, ":") < 0)
1135 return NULL;
1136
1137 if (read_expect_type(EVENT_ITEM, &token) < 0)
1138 goto fail;
1139
1140 return token;
1141
1142 fail:
1143 free_token(token);
1144 return NULL;
1145 }
1146
1147 static int event_read_id(void)
1148 {
1149 char *token;
1150 int id;
1151
1152 if (read_expected_item(EVENT_ITEM, "ID") < 0)
1153 return -1;
1154
1155 if (read_expected(EVENT_OP, ":") < 0)
1156 return -1;
1157
1158 if (read_expect_type(EVENT_ITEM, &token) < 0)
1159 goto fail;
1160
1161 id = strtoul(token, NULL, 0);
1162 free_token(token);
1163 return id;
1164
1165 fail:
1166 free_token(token);
1167 return -1;
1168 }
1169
1170 static int field_is_string(struct format_field *field)
1171 {
1172 if ((field->flags & FIELD_IS_ARRAY) &&
1173 (strstr(field->type, "char") || strstr(field->type, "u8") ||
1174 strstr(field->type, "s8")))
1175 return 1;
1176
1177 return 0;
1178 }
1179
1180 static int field_is_dynamic(struct format_field *field)
1181 {
1182 if (strncmp(field->type, "__data_loc", 10) == 0)
1183 return 1;
1184
1185 return 0;
1186 }
1187
1188 static int field_is_long(struct format_field *field)
1189 {
1190 /* includes long long */
1191 if (strstr(field->type, "long"))
1192 return 1;
1193
1194 return 0;
1195 }
1196
1197 static int event_read_fields(struct event_format *event, struct format_field **fields)
1198 {
1199 struct format_field *field = NULL;
1200 enum event_type type;
1201 char *token;
1202 char *last_token;
1203 int count = 0;
1204
1205 do {
1206 type = read_token(&token);
1207 if (type == EVENT_NEWLINE) {
1208 free_token(token);
1209 return count;
1210 }
1211
1212 count++;
1213
1214 if (test_type_token(type, token, EVENT_ITEM, "field"))
1215 goto fail;
1216 free_token(token);
1217
1218 type = read_token(&token);
1219 /*
1220 * The ftrace fields may still use the "special" name.
1221 * Just ignore it.
1222 */
1223 if (event->flags & EVENT_FL_ISFTRACE &&
1224 type == EVENT_ITEM && strcmp(token, "special") == 0) {
1225 free_token(token);
1226 type = read_token(&token);
1227 }
1228
1229 if (test_type_token(type, token, EVENT_OP, ":") < 0)
1230 goto fail;
1231
1232 free_token(token);
1233 if (read_expect_type(EVENT_ITEM, &token) < 0)
1234 goto fail;
1235
1236 last_token = token;
1237
1238 field = malloc_or_die(sizeof(*field));
1239 memset(field, 0, sizeof(*field));
1240 field->event = event;
1241
1242 /* read the rest of the type */
1243 for (;;) {
1244 type = read_token(&token);
1245 if (type == EVENT_ITEM ||
1246 (type == EVENT_OP && strcmp(token, "*") == 0) ||
1247 /*
1248 * Some of the ftrace fields are broken and have
1249 * an illegal "." in them.
1250 */
1251 (event->flags & EVENT_FL_ISFTRACE &&
1252 type == EVENT_OP && strcmp(token, ".") == 0)) {
1253
1254 if (strcmp(token, "*") == 0)
1255 field->flags |= FIELD_IS_POINTER;
1256
1257 if (field->type) {
1258 field->type = realloc(field->type,
1259 strlen(field->type) +
1260 strlen(last_token) + 2);
1261 strcat(field->type, " ");
1262 strcat(field->type, last_token);
1263 free(last_token);
1264 } else
1265 field->type = last_token;
1266 last_token = token;
1267 continue;
1268 }
1269
1270 break;
1271 }
1272
1273 if (!field->type) {
1274 die("no type found");
1275 goto fail;
1276 }
1277 field->name = last_token;
1278
1279 if (test_type(type, EVENT_OP))
1280 goto fail;
1281
1282 if (strcmp(token, "[") == 0) {
1283 enum event_type last_type = type;
1284 char *brackets = token;
1285 int len;
1286
1287 field->flags |= FIELD_IS_ARRAY;
1288
1289 type = read_token(&token);
1290
1291 if (type == EVENT_ITEM)
1292 field->arraylen = strtoul(token, NULL, 0);
1293 else
1294 field->arraylen = 0;
1295
1296 while (strcmp(token, "]") != 0) {
1297 if (last_type == EVENT_ITEM &&
1298 type == EVENT_ITEM)
1299 len = 2;
1300 else
1301 len = 1;
1302 last_type = type;
1303
1304 brackets = realloc(brackets,
1305 strlen(brackets) +
1306 strlen(token) + len);
1307 if (len == 2)
1308 strcat(brackets, " ");
1309 strcat(brackets, token);
1310 /* We only care about the last token */
1311 field->arraylen = strtoul(token, NULL, 0);
1312 free_token(token);
1313 type = read_token(&token);
1314 if (type == EVENT_NONE) {
1315 die("failed to find token");
1316 goto fail;
1317 }
1318 }
1319
1320 free_token(token);
1321
1322 brackets = realloc(brackets, strlen(brackets) + 2);
1323 strcat(brackets, "]");
1324
1325 /* add brackets to type */
1326
1327 type = read_token(&token);
1328 /*
1329 * If the next token is not an OP, then it is of
1330 * the format: type [] item;
1331 */
1332 if (type == EVENT_ITEM) {
1333 field->type = realloc(field->type,
1334 strlen(field->type) +
1335 strlen(field->name) +
1336 strlen(brackets) + 2);
1337 strcat(field->type, " ");
1338 strcat(field->type, field->name);
1339 free_token(field->name);
1340 strcat(field->type, brackets);
1341 field->name = token;
1342 type = read_token(&token);
1343 } else {
1344 field->type = realloc(field->type,
1345 strlen(field->type) +
1346 strlen(brackets) + 1);
1347 strcat(field->type, brackets);
1348 }
1349 free(brackets);
1350 }
1351
1352 if (field_is_string(field))
1353 field->flags |= FIELD_IS_STRING;
1354 if (field_is_dynamic(field))
1355 field->flags |= FIELD_IS_DYNAMIC;
1356 if (field_is_long(field))
1357 field->flags |= FIELD_IS_LONG;
1358
1359 if (test_type_token(type, token, EVENT_OP, ";"))
1360 goto fail;
1361 free_token(token);
1362
1363 if (read_expected(EVENT_ITEM, "offset") < 0)
1364 goto fail_expect;
1365
1366 if (read_expected(EVENT_OP, ":") < 0)
1367 goto fail_expect;
1368
1369 if (read_expect_type(EVENT_ITEM, &token))
1370 goto fail;
1371 field->offset = strtoul(token, NULL, 0);
1372 free_token(token);
1373
1374 if (read_expected(EVENT_OP, ";") < 0)
1375 goto fail_expect;
1376
1377 if (read_expected(EVENT_ITEM, "size") < 0)
1378 goto fail_expect;
1379
1380 if (read_expected(EVENT_OP, ":") < 0)
1381 goto fail_expect;
1382
1383 if (read_expect_type(EVENT_ITEM, &token))
1384 goto fail;
1385 field->size = strtoul(token, NULL, 0);
1386 free_token(token);
1387
1388 if (read_expected(EVENT_OP, ";") < 0)
1389 goto fail_expect;
1390
1391 type = read_token(&token);
1392 if (type != EVENT_NEWLINE) {
1393 /* newer versions of the kernel have a "signed" type */
1394 if (test_type_token(type, token, EVENT_ITEM, "signed"))
1395 goto fail;
1396
1397 free_token(token);
1398
1399 if (read_expected(EVENT_OP, ":") < 0)
1400 goto fail_expect;
1401
1402 if (read_expect_type(EVENT_ITEM, &token))
1403 goto fail;
1404
1405 /* add signed type */
1406
1407 free_token(token);
1408 if (read_expected(EVENT_OP, ";") < 0)
1409 goto fail_expect;
1410
1411 if (read_expect_type(EVENT_NEWLINE, &token))
1412 goto fail;
1413 }
1414
1415 free_token(token);
1416
1417 if (field->flags & FIELD_IS_ARRAY) {
1418 if (field->arraylen)
1419 field->elementsize = field->size / field->arraylen;
1420 else if (field->flags & FIELD_IS_STRING)
1421 field->elementsize = 1;
1422 else
1423 field->elementsize = event->pevent->long_size;
1424 } else
1425 field->elementsize = field->size;
1426
1427 *fields = field;
1428 fields = &field->next;
1429
1430 } while (1);
1431
1432 return 0;
1433
1434 fail:
1435 free_token(token);
1436 fail_expect:
1437 if (field)
1438 free(field);
1439 return -1;
1440 }
1441
1442 static int event_read_format(struct event_format *event)
1443 {
1444 char *token;
1445 int ret;
1446
1447 if (read_expected_item(EVENT_ITEM, "format") < 0)
1448 return -1;
1449
1450 if (read_expected(EVENT_OP, ":") < 0)
1451 return -1;
1452
1453 if (read_expect_type(EVENT_NEWLINE, &token))
1454 goto fail;
1455 free_token(token);
1456
1457 ret = event_read_fields(event, &event->format.common_fields);
1458 if (ret < 0)
1459 return ret;
1460 event->format.nr_common = ret;
1461
1462 ret = event_read_fields(event, &event->format.fields);
1463 if (ret < 0)
1464 return ret;
1465 event->format.nr_fields = ret;
1466
1467 return 0;
1468
1469 fail:
1470 free_token(token);
1471 return -1;
1472 }
1473
1474 static enum event_type
1475 process_arg_token(struct event_format *event, struct print_arg *arg,
1476 char **tok, enum event_type type);
1477
1478 static enum event_type
1479 process_arg(struct event_format *event, struct print_arg *arg, char **tok)
1480 {
1481 enum event_type type;
1482 char *token;
1483
1484 type = read_token(&token);
1485 *tok = token;
1486
1487 return process_arg_token(event, arg, tok, type);
1488 }
1489
1490 static enum event_type
1491 process_op(struct event_format *event, struct print_arg *arg, char **tok);
1492
1493 static enum event_type
1494 process_cond(struct event_format *event, struct print_arg *top, char **tok)
1495 {
1496 struct print_arg *arg, *left, *right;
1497 enum event_type type;
1498 char *token = NULL;
1499
1500 arg = alloc_arg();
1501 left = alloc_arg();
1502 right = alloc_arg();
1503
1504 arg->type = PRINT_OP;
1505 arg->op.left = left;
1506 arg->op.right = right;
1507
1508 *tok = NULL;
1509 type = process_arg(event, left, &token);
1510
1511 again:
1512 /* Handle other operations in the arguments */
1513 if (type == EVENT_OP && strcmp(token, ":") != 0) {
1514 type = process_op(event, left, &token);
1515 goto again;
1516 }
1517
1518 if (test_type_token(type, token, EVENT_OP, ":"))
1519 goto out_free;
1520
1521 arg->op.op = token;
1522
1523 type = process_arg(event, right, &token);
1524
1525 top->op.right = arg;
1526
1527 *tok = token;
1528 return type;
1529
1530 out_free:
1531 /* Top may point to itself */
1532 top->op.right = NULL;
1533 free_token(token);
1534 free_arg(arg);
1535 return EVENT_ERROR;
1536 }
1537
1538 static enum event_type
1539 process_array(struct event_format *event, struct print_arg *top, char **tok)
1540 {
1541 struct print_arg *arg;
1542 enum event_type type;
1543 char *token = NULL;
1544
1545 arg = alloc_arg();
1546
1547 *tok = NULL;
1548 type = process_arg(event, arg, &token);
1549 if (test_type_token(type, token, EVENT_OP, "]"))
1550 goto out_free;
1551
1552 top->op.right = arg;
1553
1554 free_token(token);
1555 type = read_token_item(&token);
1556 *tok = token;
1557
1558 return type;
1559
1560 out_free:
1561 free_token(*tok);
1562 *tok = NULL;
1563 free_arg(arg);
1564 return EVENT_ERROR;
1565 }
1566
1567 static int get_op_prio(char *op)
1568 {
1569 if (!op[1]) {
1570 switch (op[0]) {
1571 case '~':
1572 case '!':
1573 return 4;
1574 case '*':
1575 case '/':
1576 case '%':
1577 return 6;
1578 case '+':
1579 case '-':
1580 return 7;
1581 /* '>>' and '<<' are 8 */
1582 case '<':
1583 case '>':
1584 return 9;
1585 /* '==' and '!=' are 10 */
1586 case '&':
1587 return 11;
1588 case '^':
1589 return 12;
1590 case '|':
1591 return 13;
1592 case '?':
1593 return 16;
1594 default:
1595 die("unknown op '%c'", op[0]);
1596 return -1;
1597 }
1598 } else {
1599 if (strcmp(op, "++") == 0 ||
1600 strcmp(op, "--") == 0) {
1601 return 3;
1602 } else if (strcmp(op, ">>") == 0 ||
1603 strcmp(op, "<<") == 0) {
1604 return 8;
1605 } else if (strcmp(op, ">=") == 0 ||
1606 strcmp(op, "<=") == 0) {
1607 return 9;
1608 } else if (strcmp(op, "==") == 0 ||
1609 strcmp(op, "!=") == 0) {
1610 return 10;
1611 } else if (strcmp(op, "&&") == 0) {
1612 return 14;
1613 } else if (strcmp(op, "||") == 0) {
1614 return 15;
1615 } else {
1616 die("unknown op '%s'", op);
1617 return -1;
1618 }
1619 }
1620 }
1621
1622 static void set_op_prio(struct print_arg *arg)
1623 {
1624
1625 /* single ops are the greatest */
1626 if (!arg->op.left || arg->op.left->type == PRINT_NULL) {
1627 arg->op.prio = 0;
1628 return;
1629 }
1630
1631 arg->op.prio = get_op_prio(arg->op.op);
1632 }
1633
1634 /* Note, *tok does not get freed, but will most likely be saved */
1635 static enum event_type
1636 process_op(struct event_format *event, struct print_arg *arg, char **tok)
1637 {
1638 struct print_arg *left, *right = NULL;
1639 enum event_type type;
1640 char *token;
1641
1642 /* the op is passed in via tok */
1643 token = *tok;
1644
1645 if (arg->type == PRINT_OP && !arg->op.left) {
1646 /* handle single op */
1647 if (token[1]) {
1648 die("bad op token %s", token);
1649 goto out_free;
1650 }
1651 switch (token[0]) {
1652 case '~':
1653 case '!':
1654 case '+':
1655 case '-':
1656 break;
1657 default:
1658 do_warning("bad op token %s", token);
1659 goto out_free;
1660
1661 }
1662
1663 /* make an empty left */
1664 left = alloc_arg();
1665 left->type = PRINT_NULL;
1666 arg->op.left = left;
1667
1668 right = alloc_arg();
1669 arg->op.right = right;
1670
1671 /* do not free the token, it belongs to an op */
1672 *tok = NULL;
1673 type = process_arg(event, right, tok);
1674
1675 } else if (strcmp(token, "?") == 0) {
1676
1677 left = alloc_arg();
1678 /* copy the top arg to the left */
1679 *left = *arg;
1680
1681 arg->type = PRINT_OP;
1682 arg->op.op = token;
1683 arg->op.left = left;
1684 arg->op.prio = 0;
1685
1686 type = process_cond(event, arg, tok);
1687
1688 } else if (strcmp(token, ">>") == 0 ||
1689 strcmp(token, "<<") == 0 ||
1690 strcmp(token, "&") == 0 ||
1691 strcmp(token, "|") == 0 ||
1692 strcmp(token, "&&") == 0 ||
1693 strcmp(token, "||") == 0 ||
1694 strcmp(token, "-") == 0 ||
1695 strcmp(token, "+") == 0 ||
1696 strcmp(token, "*") == 0 ||
1697 strcmp(token, "^") == 0 ||
1698 strcmp(token, "/") == 0 ||
1699 strcmp(token, "<") == 0 ||
1700 strcmp(token, ">") == 0 ||
1701 strcmp(token, "==") == 0 ||
1702 strcmp(token, "!=") == 0) {
1703
1704 left = alloc_arg();
1705
1706 /* copy the top arg to the left */
1707 *left = *arg;
1708
1709 arg->type = PRINT_OP;
1710 arg->op.op = token;
1711 arg->op.left = left;
1712
1713 set_op_prio(arg);
1714
1715 type = read_token_item(&token);
1716 *tok = token;
1717
1718 /* could just be a type pointer */
1719 if ((strcmp(arg->op.op, "*") == 0) &&
1720 type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1721 if (left->type != PRINT_ATOM)
1722 die("bad pointer type");
1723 left->atom.atom = realloc(left->atom.atom,
1724 strlen(left->atom.atom) + 3);
1725 strcat(left->atom.atom, " *");
1726 free(arg->op.op);
1727 *arg = *left;
1728 free(left);
1729
1730 return type;
1731 }
1732
1733 right = alloc_arg();
1734 type = process_arg_token(event, right, tok, type);
1735 arg->op.right = right;
1736
1737 } else if (strcmp(token, "[") == 0) {
1738
1739 left = alloc_arg();
1740 *left = *arg;
1741
1742 arg->type = PRINT_OP;
1743 arg->op.op = token;
1744 arg->op.left = left;
1745
1746 arg->op.prio = 0;
1747
1748 type = process_array(event, arg, tok);
1749
1750 } else {
1751 do_warning("unknown op '%s'", token);
1752 event->flags |= EVENT_FL_FAILED;
1753 /* the arg is now the left side */
1754 goto out_free;
1755 }
1756
1757 if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
1758 int prio;
1759
1760 /* higher prios need to be closer to the root */
1761 prio = get_op_prio(*tok);
1762
1763 if (prio > arg->op.prio)
1764 return process_op(event, arg, tok);
1765
1766 return process_op(event, right, tok);
1767 }
1768
1769 return type;
1770
1771 out_free:
1772 free_token(token);
1773 *tok = NULL;
1774 return EVENT_ERROR;
1775 }
1776
1777 static enum event_type
1778 process_entry(struct event_format *event __unused, struct print_arg *arg,
1779 char **tok)
1780 {
1781 enum event_type type;
1782 char *field;
1783 char *token;
1784
1785 if (read_expected(EVENT_OP, "->") < 0)
1786 goto out_err;
1787
1788 if (read_expect_type(EVENT_ITEM, &token) < 0)
1789 goto out_free;
1790 field = token;
1791
1792 arg->type = PRINT_FIELD;
1793 arg->field.name = field;
1794
1795 if (is_flag_field) {
1796 arg->field.field = pevent_find_any_field(event, arg->field.name);
1797 arg->field.field->flags |= FIELD_IS_FLAG;
1798 is_flag_field = 0;
1799 } else if (is_symbolic_field) {
1800 arg->field.field = pevent_find_any_field(event, arg->field.name);
1801 arg->field.field->flags |= FIELD_IS_SYMBOLIC;
1802 is_symbolic_field = 0;
1803 }
1804
1805 type = read_token(&token);
1806 *tok = token;
1807
1808 return type;
1809
1810 out_free:
1811 free_token(token);
1812 out_err:
1813 *tok = NULL;
1814 return EVENT_ERROR;
1815 }
1816
1817 static char *arg_eval (struct print_arg *arg);
1818
1819 static unsigned long long
1820 eval_type_str(unsigned long long val, const char *type, int pointer)
1821 {
1822 int sign = 0;
1823 char *ref;
1824 int len;
1825
1826 len = strlen(type);
1827
1828 if (pointer) {
1829
1830 if (type[len-1] != '*') {
1831 do_warning("pointer expected with non pointer type");
1832 return val;
1833 }
1834
1835 ref = malloc_or_die(len);
1836 memcpy(ref, type, len);
1837
1838 /* chop off the " *" */
1839 ref[len - 2] = 0;
1840
1841 val = eval_type_str(val, ref, 0);
1842 free(ref);
1843 return val;
1844 }
1845
1846 /* check if this is a pointer */
1847 if (type[len - 1] == '*')
1848 return val;
1849
1850 /* Try to figure out the arg size*/
1851 if (strncmp(type, "struct", 6) == 0)
1852 /* all bets off */
1853 return val;
1854
1855 if (strcmp(type, "u8") == 0)
1856 return val & 0xff;
1857
1858 if (strcmp(type, "u16") == 0)
1859 return val & 0xffff;
1860
1861 if (strcmp(type, "u32") == 0)
1862 return val & 0xffffffff;
1863
1864 if (strcmp(type, "u64") == 0 ||
1865 strcmp(type, "s64"))
1866 return val;
1867
1868 if (strcmp(type, "s8") == 0)
1869 return (unsigned long long)(char)val & 0xff;
1870
1871 if (strcmp(type, "s16") == 0)
1872 return (unsigned long long)(short)val & 0xffff;
1873
1874 if (strcmp(type, "s32") == 0)
1875 return (unsigned long long)(int)val & 0xffffffff;
1876
1877 if (strncmp(type, "unsigned ", 9) == 0) {
1878 sign = 0;
1879 type += 9;
1880 }
1881
1882 if (strcmp(type, "char") == 0) {
1883 if (sign)
1884 return (unsigned long long)(char)val & 0xff;
1885 else
1886 return val & 0xff;
1887 }
1888
1889 if (strcmp(type, "short") == 0) {
1890 if (sign)
1891 return (unsigned long long)(short)val & 0xffff;
1892 else
1893 return val & 0xffff;
1894 }
1895
1896 if (strcmp(type, "int") == 0) {
1897 if (sign)
1898 return (unsigned long long)(int)val & 0xffffffff;
1899 else
1900 return val & 0xffffffff;
1901 }
1902
1903 return val;
1904 }
1905
1906 /*
1907 * Try to figure out the type.
1908 */
1909 static unsigned long long
1910 eval_type(unsigned long long val, struct print_arg *arg, int pointer)
1911 {
1912 if (arg->type != PRINT_TYPE)
1913 die("expected type argument");
1914
1915 return eval_type_str(val, arg->typecast.type, pointer);
1916 }
1917
1918 static int arg_num_eval(struct print_arg *arg, long long *val)
1919 {
1920 long long left, right;
1921 int ret = 1;
1922
1923 switch (arg->type) {
1924 case PRINT_ATOM:
1925 *val = strtoll(arg->atom.atom, NULL, 0);
1926 break;
1927 case PRINT_TYPE:
1928 ret = arg_num_eval(arg->typecast.item, val);
1929 if (!ret)
1930 break;
1931 *val = eval_type(*val, arg, 0);
1932 break;
1933 case PRINT_OP:
1934 switch (arg->op.op[0]) {
1935 case '|':
1936 ret = arg_num_eval(arg->op.left, &left);
1937 if (!ret)
1938 break;
1939 ret = arg_num_eval(arg->op.right, &right);
1940 if (!ret)
1941 break;
1942 if (arg->op.op[1])
1943 *val = left || right;
1944 else
1945 *val = left | right;
1946 break;
1947 case '&':
1948 ret = arg_num_eval(arg->op.left, &left);
1949 if (!ret)
1950 break;
1951 ret = arg_num_eval(arg->op.right, &right);
1952 if (!ret)
1953 break;
1954 if (arg->op.op[1])
1955 *val = left && right;
1956 else
1957 *val = left & right;
1958 break;
1959 case '<':
1960 ret = arg_num_eval(arg->op.left, &left);
1961 if (!ret)
1962 break;
1963 ret = arg_num_eval(arg->op.right, &right);
1964 if (!ret)
1965 break;
1966 switch (arg->op.op[1]) {
1967 case 0:
1968 *val = left < right;
1969 break;
1970 case '<':
1971 *val = left << right;
1972 break;
1973 case '=':
1974 *val = left <= right;
1975 break;
1976 default:
1977 do_warning("unknown op '%s'", arg->op.op);
1978 ret = 0;
1979 }
1980 break;
1981 case '>':
1982 ret = arg_num_eval(arg->op.left, &left);
1983 if (!ret)
1984 break;
1985 ret = arg_num_eval(arg->op.right, &right);
1986 if (!ret)
1987 break;
1988 switch (arg->op.op[1]) {
1989 case 0:
1990 *val = left > right;
1991 break;
1992 case '>':
1993 *val = left >> right;
1994 break;
1995 case '=':
1996 *val = left >= right;
1997 break;
1998 default:
1999 do_warning("unknown op '%s'", arg->op.op);
2000 ret = 0;
2001 }
2002 break;
2003 case '=':
2004 ret = arg_num_eval(arg->op.left, &left);
2005 if (!ret)
2006 break;
2007 ret = arg_num_eval(arg->op.right, &right);
2008 if (!ret)
2009 break;
2010
2011 if (arg->op.op[1] != '=') {
2012 do_warning("unknown op '%s'", arg->op.op);
2013 ret = 0;
2014 } else
2015 *val = left == right;
2016 break;
2017 case '!':
2018 ret = arg_num_eval(arg->op.left, &left);
2019 if (!ret)
2020 break;
2021 ret = arg_num_eval(arg->op.right, &right);
2022 if (!ret)
2023 break;
2024
2025 switch (arg->op.op[1]) {
2026 case '=':
2027 *val = left != right;
2028 break;
2029 default:
2030 do_warning("unknown op '%s'", arg->op.op);
2031 ret = 0;
2032 }
2033 break;
2034 case '-':
2035 /* check for negative */
2036 if (arg->op.left->type == PRINT_NULL)
2037 left = 0;
2038 else
2039 ret = arg_num_eval(arg->op.left, &left);
2040 if (!ret)
2041 break;
2042 ret = arg_num_eval(arg->op.right, &right);
2043 if (!ret)
2044 break;
2045 *val = left - right;
2046 break;
2047 default:
2048 do_warning("unknown op '%s'", arg->op.op);
2049 ret = 0;
2050 }
2051 break;
2052
2053 case PRINT_NULL:
2054 case PRINT_FIELD ... PRINT_SYMBOL:
2055 case PRINT_STRING:
2056 case PRINT_BSTRING:
2057 default:
2058 do_warning("invalid eval type %d", arg->type);
2059 ret = 0;
2060
2061 }
2062 return ret;
2063 }
2064
2065 static char *arg_eval (struct print_arg *arg)
2066 {
2067 long long val;
2068 static char buf[20];
2069
2070 switch (arg->type) {
2071 case PRINT_ATOM:
2072 return arg->atom.atom;
2073 case PRINT_TYPE:
2074 return arg_eval(arg->typecast.item);
2075 case PRINT_OP:
2076 if (!arg_num_eval(arg, &val))
2077 break;
2078 sprintf(buf, "%lld", val);
2079 return buf;
2080
2081 case PRINT_NULL:
2082 case PRINT_FIELD ... PRINT_SYMBOL:
2083 case PRINT_STRING:
2084 case PRINT_BSTRING:
2085 default:
2086 die("invalid eval type %d", arg->type);
2087 break;
2088 }
2089
2090 return NULL;
2091 }
2092
2093 static enum event_type
2094 process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2095 {
2096 enum event_type type;
2097 struct print_arg *arg = NULL;
2098 struct print_flag_sym *field;
2099 char *token = *tok;
2100 char *value;
2101
2102 do {
2103 free_token(token);
2104 type = read_token_item(&token);
2105 if (test_type_token(type, token, EVENT_OP, "{"))
2106 break;
2107
2108 arg = alloc_arg();
2109
2110 free_token(token);
2111 type = process_arg(event, arg, &token);
2112 if (test_type_token(type, token, EVENT_DELIM, ","))
2113 goto out_free;
2114
2115 field = malloc_or_die(sizeof(*field));
2116 memset(field, 0, sizeof(*field));
2117
2118 value = arg_eval(arg);
2119 if (value == NULL)
2120 goto out_free;
2121 field->value = strdup(value);
2122
2123 free_arg(arg);
2124 arg = alloc_arg();
2125
2126 free_token(token);
2127 type = process_arg(event, arg, &token);
2128 if (test_type_token(type, token, EVENT_OP, "}"))
2129 goto out_free;
2130
2131 value = arg_eval(arg);
2132 if (value == NULL)
2133 goto out_free;
2134 field->str = strdup(value);
2135 free_arg(arg);
2136 arg = NULL;
2137
2138 *list = field;
2139 list = &field->next;
2140
2141 free_token(token);
2142 type = read_token_item(&token);
2143 } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2144
2145 *tok = token;
2146 return type;
2147
2148 out_free:
2149 free_arg(arg);
2150 free_token(token);
2151 *tok = NULL;
2152
2153 return EVENT_ERROR;
2154 }
2155
2156 static enum event_type
2157 process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2158 {
2159 struct print_arg *field;
2160 enum event_type type;
2161 char *token;
2162
2163 memset(arg, 0, sizeof(*arg));
2164 arg->type = PRINT_FLAGS;
2165
2166 field = alloc_arg();
2167
2168 type = process_arg(event, field, &token);
2169
2170 /* Handle operations in the first argument */
2171 while (type == EVENT_OP)
2172 type = process_op(event, field, &token);
2173
2174 if (test_type_token(type, token, EVENT_DELIM, ","))
2175 goto out_free;
2176 free_token(token);
2177
2178 arg->flags.field = field;
2179
2180 type = read_token_item(&token);
2181 if (event_item_type(type)) {
2182 arg->flags.delim = token;
2183 type = read_token_item(&token);
2184 }
2185
2186 if (test_type_token(type, token, EVENT_DELIM, ","))
2187 goto out_free;
2188
2189 type = process_fields(event, &arg->flags.flags, &token);
2190 if (test_type_token(type, token, EVENT_DELIM, ")"))
2191 goto out_free;
2192
2193 free_token(token);
2194 type = read_token_item(tok);
2195 return type;
2196
2197 out_free:
2198 free_token(token);
2199 *tok = NULL;
2200 return EVENT_ERROR;
2201 }
2202
2203 static enum event_type
2204 process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2205 {
2206 struct print_arg *field;
2207 enum event_type type;
2208 char *token;
2209
2210 memset(arg, 0, sizeof(*arg));
2211 arg->type = PRINT_SYMBOL;
2212
2213 field = alloc_arg();
2214
2215 type = process_arg(event, field, &token);
2216 if (test_type_token(type, token, EVENT_DELIM, ","))
2217 goto out_free;
2218
2219 arg->symbol.field = field;
2220
2221 type = process_fields(event, &arg->symbol.symbols, &token);
2222 if (test_type_token(type, token, EVENT_DELIM, ")"))
2223 goto out_free;
2224
2225 free_token(token);
2226 type = read_token_item(tok);
2227 return type;
2228
2229 out_free:
2230 free_token(token);
2231 *tok = NULL;
2232 return EVENT_ERROR;
2233 }
2234
2235 static enum event_type
2236 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2237 {
2238 struct format_field *field;
2239 enum event_type type;
2240 char *token;
2241
2242 memset(arg, 0, sizeof(*arg));
2243 arg->type = PRINT_DYNAMIC_ARRAY;
2244
2245 /*
2246 * The item within the parenthesis is another field that holds
2247 * the index into where the array starts.
2248 */
2249 type = read_token(&token);
2250 *tok = token;
2251 if (type != EVENT_ITEM)
2252 goto out_free;
2253
2254 /* Find the field */
2255
2256 field = pevent_find_field(event, token);
2257 if (!field)
2258 goto out_free;
2259
2260 arg->dynarray.field = field;
2261 arg->dynarray.index = 0;
2262
2263 if (read_expected(EVENT_DELIM, ")") < 0)
2264 goto out_free;
2265
2266 free_token(token);
2267 type = read_token_item(&token);
2268 *tok = token;
2269 if (type != EVENT_OP || strcmp(token, "[") != 0)
2270 return type;
2271
2272 free_token(token);
2273 arg = alloc_arg();
2274 type = process_arg(event, arg, &token);
2275 if (type == EVENT_ERROR)
2276 goto out_free;
2277
2278 if (!test_type_token(type, token, EVENT_OP, "]"))
2279 goto out_free;
2280
2281 free_token(token);
2282 type = read_token_item(tok);
2283 return type;
2284
2285 out_free:
2286 free(arg);
2287 free_token(token);
2288 *tok = NULL;
2289 return EVENT_ERROR;
2290 }
2291
2292 static enum event_type
2293 process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2294 {
2295 struct print_arg *item_arg;
2296 enum event_type type;
2297 char *token;
2298
2299 type = process_arg(event, arg, &token);
2300
2301 if (type == EVENT_ERROR)
2302 goto out_free;
2303
2304 if (type == EVENT_OP)
2305 type = process_op(event, arg, &token);
2306
2307 if (type == EVENT_ERROR)
2308 goto out_free;
2309
2310 if (test_type_token(type, token, EVENT_DELIM, ")"))
2311 goto out_free;
2312
2313 free_token(token);
2314 type = read_token_item(&token);
2315
2316 /*
2317 * If the next token is an item or another open paren, then
2318 * this was a typecast.
2319 */
2320 if (event_item_type(type) ||
2321 (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2322
2323 /* make this a typecast and contine */
2324
2325 /* prevous must be an atom */
2326 if (arg->type != PRINT_ATOM)
2327 die("previous needed to be PRINT_ATOM");
2328
2329 item_arg = alloc_arg();
2330
2331 arg->type = PRINT_TYPE;
2332 arg->typecast.type = arg->atom.atom;
2333 arg->typecast.item = item_arg;
2334 type = process_arg_token(event, item_arg, &token, type);
2335
2336 }
2337
2338 *tok = token;
2339 return type;
2340
2341 out_free:
2342 free_token(token);
2343 *tok = NULL;
2344 return EVENT_ERROR;
2345 }
2346
2347
2348 static enum event_type
2349 process_str(struct event_format *event __unused, struct print_arg *arg, char **tok)
2350 {
2351 enum event_type type;
2352 char *token;
2353
2354 if (read_expect_type(EVENT_ITEM, &token) < 0)
2355 goto out_free;
2356
2357 arg->type = PRINT_STRING;
2358 arg->string.string = token;
2359 arg->string.offset = -1;
2360
2361 if (read_expected(EVENT_DELIM, ")") < 0)
2362 goto out_err;
2363
2364 type = read_token(&token);
2365 *tok = token;
2366
2367 return type;
2368
2369 out_free:
2370 free_token(token);
2371 out_err:
2372 *tok = NULL;
2373 return EVENT_ERROR;
2374 }
2375
2376 static struct pevent_function_handler *
2377 find_func_handler(struct pevent *pevent, char *func_name)
2378 {
2379 struct pevent_function_handler *func;
2380
2381 for (func = pevent->func_handlers; func; func = func->next) {
2382 if (strcmp(func->name, func_name) == 0)
2383 break;
2384 }
2385
2386 return func;
2387 }
2388
2389 static void remove_func_handler(struct pevent *pevent, char *func_name)
2390 {
2391 struct pevent_function_handler *func;
2392 struct pevent_function_handler **next;
2393
2394 next = &pevent->func_handlers;
2395 while ((func = *next)) {
2396 if (strcmp(func->name, func_name) == 0) {
2397 *next = func->next;
2398 free_func_handle(func);
2399 break;
2400 }
2401 next = &func->next;
2402 }
2403 }
2404
2405 static enum event_type
2406 process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2407 struct print_arg *arg, char **tok)
2408 {
2409 struct print_arg **next_arg;
2410 struct print_arg *farg;
2411 enum event_type type;
2412 char *token;
2413 char *test;
2414 int i;
2415
2416 arg->type = PRINT_FUNC;
2417 arg->func.func = func;
2418
2419 *tok = NULL;
2420
2421 next_arg = &(arg->func.args);
2422 for (i = 0; i < func->nr_args; i++) {
2423 farg = alloc_arg();
2424 type = process_arg(event, farg, &token);
2425 if (i < (func->nr_args - 1))
2426 test = ",";
2427 else
2428 test = ")";
2429
2430 if (test_type_token(type, token, EVENT_DELIM, test)) {
2431 free_arg(farg);
2432 free_token(token);
2433 return EVENT_ERROR;
2434 }
2435
2436 *next_arg = farg;
2437 next_arg = &(farg->next);
2438 free_token(token);
2439 }
2440
2441 type = read_token(&token);
2442 *tok = token;
2443
2444 return type;
2445 }
2446
2447 static enum event_type
2448 process_function(struct event_format *event, struct print_arg *arg,
2449 char *token, char **tok)
2450 {
2451 struct pevent_function_handler *func;
2452
2453 if (strcmp(token, "__print_flags") == 0) {
2454 free_token(token);
2455 is_flag_field = 1;
2456 return process_flags(event, arg, tok);
2457 }
2458 if (strcmp(token, "__print_symbolic") == 0) {
2459 free_token(token);
2460 is_symbolic_field = 1;
2461 return process_symbols(event, arg, tok);
2462 }
2463 if (strcmp(token, "__get_str") == 0) {
2464 free_token(token);
2465 return process_str(event, arg, tok);
2466 }
2467 if (strcmp(token, "__get_dynamic_array") == 0) {
2468 free_token(token);
2469 return process_dynamic_array(event, arg, tok);
2470 }
2471
2472 func = find_func_handler(event->pevent, token);
2473 if (func) {
2474 free_token(token);
2475 return process_func_handler(event, func, arg, tok);
2476 }
2477
2478 do_warning("function %s not defined", token);
2479 free_token(token);
2480 return EVENT_ERROR;
2481 }
2482
2483 static enum event_type
2484 process_arg_token(struct event_format *event, struct print_arg *arg,
2485 char **tok, enum event_type type)
2486 {
2487 char *token;
2488 char *atom;
2489
2490 token = *tok;
2491
2492 switch (type) {
2493 case EVENT_ITEM:
2494 if (strcmp(token, "REC") == 0) {
2495 free_token(token);
2496 type = process_entry(event, arg, &token);
2497 break;
2498 }
2499 atom = token;
2500 /* test the next token */
2501 type = read_token_item(&token);
2502
2503 /*
2504 * If the next token is a parenthesis, then this
2505 * is a function.
2506 */
2507 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
2508 free_token(token);
2509 token = NULL;
2510 /* this will free atom. */
2511 type = process_function(event, arg, atom, &token);
2512 break;
2513 }
2514 /* atoms can be more than one token long */
2515 while (type == EVENT_ITEM) {
2516 atom = realloc(atom, strlen(atom) + strlen(token) + 2);
2517 strcat(atom, " ");
2518 strcat(atom, token);
2519 free_token(token);
2520 type = read_token_item(&token);
2521 }
2522
2523 arg->type = PRINT_ATOM;
2524 arg->atom.atom = atom;
2525 break;
2526
2527 case EVENT_DQUOTE:
2528 case EVENT_SQUOTE:
2529 arg->type = PRINT_ATOM;
2530 arg->atom.atom = token;
2531 type = read_token_item(&token);
2532 break;
2533 case EVENT_DELIM:
2534 if (strcmp(token, "(") == 0) {
2535 free_token(token);
2536 type = process_paren(event, arg, &token);
2537 break;
2538 }
2539 case EVENT_OP:
2540 /* handle single ops */
2541 arg->type = PRINT_OP;
2542 arg->op.op = token;
2543 arg->op.left = NULL;
2544 type = process_op(event, arg, &token);
2545
2546 /* On error, the op is freed */
2547 if (type == EVENT_ERROR)
2548 arg->op.op = NULL;
2549
2550 /* return error type if errored */
2551 break;
2552
2553 case EVENT_ERROR ... EVENT_NEWLINE:
2554 default:
2555 die("unexpected type %d", type);
2556 }
2557 *tok = token;
2558
2559 return type;
2560 }
2561
2562 static int event_read_print_args(struct event_format *event, struct print_arg **list)
2563 {
2564 enum event_type type = EVENT_ERROR;
2565 struct print_arg *arg;
2566 char *token;
2567 int args = 0;
2568
2569 do {
2570 if (type == EVENT_NEWLINE) {
2571 type = read_token_item(&token);
2572 continue;
2573 }
2574
2575 arg = alloc_arg();
2576
2577 type = process_arg(event, arg, &token);
2578
2579 if (type == EVENT_ERROR) {
2580 free_token(token);
2581 free_arg(arg);
2582 return -1;
2583 }
2584
2585 *list = arg;
2586 args++;
2587
2588 if (type == EVENT_OP) {
2589 type = process_op(event, arg, &token);
2590 free_token(token);
2591 if (type == EVENT_ERROR) {
2592 *list = NULL;
2593 free_arg(arg);
2594 return -1;
2595 }
2596 list = &arg->next;
2597 continue;
2598 }
2599
2600 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
2601 free_token(token);
2602 *list = arg;
2603 list = &arg->next;
2604 continue;
2605 }
2606 break;
2607 } while (type != EVENT_NONE);
2608
2609 if (type != EVENT_NONE && type != EVENT_ERROR)
2610 free_token(token);
2611
2612 return args;
2613 }
2614
2615 static int event_read_print(struct event_format *event)
2616 {
2617 enum event_type type;
2618 char *token;
2619 int ret;
2620
2621 if (read_expected_item(EVENT_ITEM, "print") < 0)
2622 return -1;
2623
2624 if (read_expected(EVENT_ITEM, "fmt") < 0)
2625 return -1;
2626
2627 if (read_expected(EVENT_OP, ":") < 0)
2628 return -1;
2629
2630 if (read_expect_type(EVENT_DQUOTE, &token) < 0)
2631 goto fail;
2632
2633 concat:
2634 event->print_fmt.format = token;
2635 event->print_fmt.args = NULL;
2636
2637 /* ok to have no arg */
2638 type = read_token_item(&token);
2639
2640 if (type == EVENT_NONE)
2641 return 0;
2642
2643 /* Handle concatenation of print lines */
2644 if (type == EVENT_DQUOTE) {
2645 char *cat;
2646
2647 cat = malloc_or_die(strlen(event->print_fmt.format) +
2648 strlen(token) + 1);
2649 strcpy(cat, event->print_fmt.format);
2650 strcat(cat, token);
2651 free_token(token);
2652 free_token(event->print_fmt.format);
2653 event->print_fmt.format = NULL;
2654 token = cat;
2655 goto concat;
2656 }
2657
2658 if (test_type_token(type, token, EVENT_DELIM, ","))
2659 goto fail;
2660
2661 free_token(token);
2662
2663 ret = event_read_print_args(event, &event->print_fmt.args);
2664 if (ret < 0)
2665 return -1;
2666
2667 return ret;
2668
2669 fail:
2670 free_token(token);
2671 return -1;
2672 }
2673
2674 /**
2675 * pevent_find_common_field - return a common field by event
2676 * @event: handle for the event
2677 * @name: the name of the common field to return
2678 *
2679 * Returns a common field from the event by the given @name.
2680 * This only searchs the common fields and not all field.
2681 */
2682 struct format_field *
2683 pevent_find_common_field(struct event_format *event, const char *name)
2684 {
2685 struct format_field *format;
2686
2687 for (format = event->format.common_fields;
2688 format; format = format->next) {
2689 if (strcmp(format->name, name) == 0)
2690 break;
2691 }
2692
2693 return format;
2694 }
2695
2696 /**
2697 * pevent_find_field - find a non-common field
2698 * @event: handle for the event
2699 * @name: the name of the non-common field
2700 *
2701 * Returns a non-common field by the given @name.
2702 * This does not search common fields.
2703 */
2704 struct format_field *
2705 pevent_find_field(struct event_format *event, const char *name)
2706 {
2707 struct format_field *format;
2708
2709 for (format = event->format.fields;
2710 format; format = format->next) {
2711 if (strcmp(format->name, name) == 0)
2712 break;
2713 }
2714
2715 return format;
2716 }
2717
2718 /**
2719 * pevent_find_any_field - find any field by name
2720 * @event: handle for the event
2721 * @name: the name of the field
2722 *
2723 * Returns a field by the given @name.
2724 * This searchs the common field names first, then
2725 * the non-common ones if a common one was not found.
2726 */
2727 struct format_field *
2728 pevent_find_any_field(struct event_format *event, const char *name)
2729 {
2730 struct format_field *format;
2731
2732 format = pevent_find_common_field(event, name);
2733 if (format)
2734 return format;
2735 return pevent_find_field(event, name);
2736 }
2737
2738 /**
2739 * pevent_read_number - read a number from data
2740 * @pevent: handle for the pevent
2741 * @ptr: the raw data
2742 * @size: the size of the data that holds the number
2743 *
2744 * Returns the number (converted to host) from the
2745 * raw data.
2746 */
2747 unsigned long long pevent_read_number(struct pevent *pevent,
2748 const void *ptr, int size)
2749 {
2750 switch (size) {
2751 case 1:
2752 return *(unsigned char *)ptr;
2753 case 2:
2754 return data2host2(pevent, ptr);
2755 case 4:
2756 return data2host4(pevent, ptr);
2757 case 8:
2758 return data2host8(pevent, ptr);
2759 default:
2760 /* BUG! */
2761 return 0;
2762 }
2763 }
2764
2765 /**
2766 * pevent_read_number_field - read a number from data
2767 * @field: a handle to the field
2768 * @data: the raw data to read
2769 * @value: the value to place the number in
2770 *
2771 * Reads raw data according to a field offset and size,
2772 * and translates it into @value.
2773 *
2774 * Returns 0 on success, -1 otherwise.
2775 */
2776 int pevent_read_number_field(struct format_field *field, const void *data,
2777 unsigned long long *value)
2778 {
2779 if (!field)
2780 return -1;
2781 switch (field->size) {
2782 case 1:
2783 case 2:
2784 case 4:
2785 case 8:
2786 *value = pevent_read_number(field->event->pevent,
2787 data + field->offset, field->size);
2788 return 0;
2789 default:
2790 return -1;
2791 }
2792 }
2793
2794 static int get_common_info(struct pevent *pevent,
2795 const char *type, int *offset, int *size)
2796 {
2797 struct event_format *event;
2798 struct format_field *field;
2799
2800 /*
2801 * All events should have the same common elements.
2802 * Pick any event to find where the type is;
2803 */
2804 if (!pevent->events)
2805 die("no event_list!");
2806
2807 event = pevent->events[0];
2808 field = pevent_find_common_field(event, type);
2809 if (!field)
2810 die("field '%s' not found", type);
2811
2812 *offset = field->offset;
2813 *size = field->size;
2814
2815 return 0;
2816 }
2817
2818 static int __parse_common(struct pevent *pevent, void *data,
2819 int *size, int *offset, const char *name)
2820 {
2821 int ret;
2822
2823 if (!*size) {
2824 ret = get_common_info(pevent, name, offset, size);
2825 if (ret < 0)
2826 return ret;
2827 }
2828 return pevent_read_number(pevent, data + *offset, *size);
2829 }
2830
2831 static int trace_parse_common_type(struct pevent *pevent, void *data)
2832 {
2833 return __parse_common(pevent, data,
2834 &pevent->type_size, &pevent->type_offset,
2835 "common_type");
2836 }
2837
2838 static int parse_common_pid(struct pevent *pevent, void *data)
2839 {
2840 return __parse_common(pevent, data,
2841 &pevent->pid_size, &pevent->pid_offset,
2842 "common_pid");
2843 }
2844
2845 static int parse_common_pc(struct pevent *pevent, void *data)
2846 {
2847 return __parse_common(pevent, data,
2848 &pevent->pc_size, &pevent->pc_offset,
2849 "common_preempt_count");
2850 }
2851
2852 static int parse_common_flags(struct pevent *pevent, void *data)
2853 {
2854 return __parse_common(pevent, data,
2855 &pevent->flags_size, &pevent->flags_offset,
2856 "common_flags");
2857 }
2858
2859 static int parse_common_lock_depth(struct pevent *pevent, void *data)
2860 {
2861 int ret;
2862
2863 ret = __parse_common(pevent, data,
2864 &pevent->ld_size, &pevent->ld_offset,
2865 "common_lock_depth");
2866 if (ret < 0)
2867 return -1;
2868
2869 return ret;
2870 }
2871
2872 static int events_id_cmp(const void *a, const void *b);
2873
2874 /**
2875 * pevent_find_event - find an event by given id
2876 * @pevent: a handle to the pevent
2877 * @id: the id of the event
2878 *
2879 * Returns an event that has a given @id.
2880 */
2881 struct event_format *pevent_find_event(struct pevent *pevent, int id)
2882 {
2883 struct event_format **eventptr;
2884 struct event_format key;
2885 struct event_format *pkey = &key;
2886
2887 /* Check cache first */
2888 if (pevent->last_event && pevent->last_event->id == id)
2889 return pevent->last_event;
2890
2891 key.id = id;
2892
2893 eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
2894 sizeof(*pevent->events), events_id_cmp);
2895
2896 if (eventptr) {
2897 pevent->last_event = *eventptr;
2898 return *eventptr;
2899 }
2900
2901 return NULL;
2902 }
2903
2904 /**
2905 * pevent_find_event_by_name - find an event by given name
2906 * @pevent: a handle to the pevent
2907 * @sys: the system name to search for
2908 * @name: the name of the event to search for
2909 *
2910 * This returns an event with a given @name and under the system
2911 * @sys. If @sys is NULL the first event with @name is returned.
2912 */
2913 struct event_format *
2914 pevent_find_event_by_name(struct pevent *pevent,
2915 const char *sys, const char *name)
2916 {
2917 struct event_format *event;
2918 int i;
2919
2920 if (pevent->last_event &&
2921 strcmp(pevent->last_event->name, name) == 0 &&
2922 (!sys || strcmp(pevent->last_event->system, sys) == 0))
2923 return pevent->last_event;
2924
2925 for (i = 0; i < pevent->nr_events; i++) {
2926 event = pevent->events[i];
2927 if (strcmp(event->name, name) == 0) {
2928 if (!sys)
2929 break;
2930 if (strcmp(event->system, sys) == 0)
2931 break;
2932 }
2933 }
2934 if (i == pevent->nr_events)
2935 event = NULL;
2936
2937 pevent->last_event = event;
2938 return event;
2939 }
2940
2941 static unsigned long long
2942 eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
2943 {
2944 struct pevent *pevent = event->pevent;
2945 unsigned long long val = 0;
2946 unsigned long long left, right;
2947 struct print_arg *typearg = NULL;
2948 struct print_arg *larg;
2949 unsigned long offset;
2950 unsigned int field_size;
2951
2952 switch (arg->type) {
2953 case PRINT_NULL:
2954 /* ?? */
2955 return 0;
2956 case PRINT_ATOM:
2957 return strtoull(arg->atom.atom, NULL, 0);
2958 case PRINT_FIELD:
2959 if (!arg->field.field) {
2960 arg->field.field = pevent_find_any_field(event, arg->field.name);
2961 if (!arg->field.field)
2962 die("field %s not found", arg->field.name);
2963 }
2964 /* must be a number */
2965 val = pevent_read_number(pevent, data + arg->field.field->offset,
2966 arg->field.field->size);
2967 break;
2968 case PRINT_FLAGS:
2969 case PRINT_SYMBOL:
2970 break;
2971 case PRINT_TYPE:
2972 val = eval_num_arg(data, size, event, arg->typecast.item);
2973 return eval_type(val, arg, 0);
2974 case PRINT_STRING:
2975 case PRINT_BSTRING:
2976 return 0;
2977 case PRINT_FUNC: {
2978 struct trace_seq s;
2979 trace_seq_init(&s);
2980 val = process_defined_func(&s, data, size, event, arg);
2981 trace_seq_destroy(&s);
2982 return val;
2983 }
2984 case PRINT_OP:
2985 if (strcmp(arg->op.op, "[") == 0) {
2986 /*
2987 * Arrays are special, since we don't want
2988 * to read the arg as is.
2989 */
2990 right = eval_num_arg(data, size, event, arg->op.right);
2991
2992 /* handle typecasts */
2993 larg = arg->op.left;
2994 while (larg->type == PRINT_TYPE) {
2995 if (!typearg)
2996 typearg = larg;
2997 larg = larg->typecast.item;
2998 }
2999
3000 /* Default to long size */
3001 field_size = pevent->long_size;
3002
3003 switch (larg->type) {
3004 case PRINT_DYNAMIC_ARRAY:
3005 offset = pevent_read_number(pevent,
3006 data + larg->dynarray.field->offset,
3007 larg->dynarray.field->size);
3008 if (larg->dynarray.field->elementsize)
3009 field_size = larg->dynarray.field->elementsize;
3010 /*
3011 * The actual length of the dynamic array is stored
3012 * in the top half of the field, and the offset
3013 * is in the bottom half of the 32 bit field.
3014 */
3015 offset &= 0xffff;
3016 offset += right;
3017 break;
3018 case PRINT_FIELD:
3019 if (!larg->field.field) {
3020 larg->field.field =
3021 pevent_find_any_field(event, larg->field.name);
3022 if (!larg->field.field)
3023 die("field %s not found", larg->field.name);
3024 }
3025 field_size = larg->field.field->elementsize;
3026 offset = larg->field.field->offset +
3027 right * larg->field.field->elementsize;
3028 break;
3029 default:
3030 goto default_op; /* oops, all bets off */
3031 }
3032 val = pevent_read_number(pevent,
3033 data + offset, field_size);
3034 if (typearg)
3035 val = eval_type(val, typearg, 1);
3036 break;
3037 } else if (strcmp(arg->op.op, "?") == 0) {
3038 left = eval_num_arg(data, size, event, arg->op.left);
3039 arg = arg->op.right;
3040 if (left)
3041 val = eval_num_arg(data, size, event, arg->op.left);
3042 else
3043 val = eval_num_arg(data, size, event, arg->op.right);
3044 break;
3045 }
3046 default_op:
3047 left = eval_num_arg(data, size, event, arg->op.left);
3048 right = eval_num_arg(data, size, event, arg->op.right);
3049 switch (arg->op.op[0]) {
3050 case '!':
3051 switch (arg->op.op[1]) {
3052 case 0:
3053 val = !right;
3054 break;
3055 case '=':
3056 val = left != right;
3057 break;
3058 default:
3059 die("unknown op '%s'", arg->op.op);
3060 }
3061 break;
3062 case '~':
3063 val = ~right;
3064 break;
3065 case '|':
3066 if (arg->op.op[1])
3067 val = left || right;
3068 else
3069 val = left | right;
3070 break;
3071 case '&':
3072 if (arg->op.op[1])
3073 val = left && right;
3074 else
3075 val = left & right;
3076 break;
3077 case '<':
3078 switch (arg->op.op[1]) {
3079 case 0:
3080 val = left < right;
3081 break;
3082 case '<':
3083 val = left << right;
3084 break;
3085 case '=':
3086 val = left <= right;
3087 break;
3088 default:
3089 die("unknown op '%s'", arg->op.op);
3090 }
3091 break;
3092 case '>':
3093 switch (arg->op.op[1]) {
3094 case 0:
3095 val = left > right;
3096 break;
3097 case '>':
3098 val = left >> right;
3099 break;
3100 case '=':
3101 val = left >= right;
3102 break;
3103 default:
3104 die("unknown op '%s'", arg->op.op);
3105 }
3106 break;
3107 case '=':
3108 if (arg->op.op[1] != '=')
3109 die("unknown op '%s'", arg->op.op);
3110 val = left == right;
3111 break;
3112 case '-':
3113 val = left - right;
3114 break;
3115 case '+':
3116 val = left + right;
3117 break;
3118 default:
3119 die("unknown op '%s'", arg->op.op);
3120 }
3121 break;
3122 default: /* not sure what to do there */
3123 return 0;
3124 }
3125 return val;
3126 }
3127
3128 struct flag {
3129 const char *name;
3130 unsigned long long value;
3131 };
3132
3133 static const struct flag flags[] = {
3134 { "HI_SOFTIRQ", 0 },
3135 { "TIMER_SOFTIRQ", 1 },
3136 { "NET_TX_SOFTIRQ", 2 },
3137 { "NET_RX_SOFTIRQ", 3 },
3138 { "BLOCK_SOFTIRQ", 4 },
3139 { "BLOCK_IOPOLL_SOFTIRQ", 5 },
3140 { "TASKLET_SOFTIRQ", 6 },
3141 { "SCHED_SOFTIRQ", 7 },
3142 { "HRTIMER_SOFTIRQ", 8 },
3143 { "RCU_SOFTIRQ", 9 },
3144
3145 { "HRTIMER_NORESTART", 0 },
3146 { "HRTIMER_RESTART", 1 },
3147 };
3148
3149 static unsigned long long eval_flag(const char *flag)
3150 {
3151 int i;
3152
3153 /*
3154 * Some flags in the format files do not get converted.
3155 * If the flag is not numeric, see if it is something that
3156 * we already know about.
3157 */
3158 if (isdigit(flag[0]))
3159 return strtoull(flag, NULL, 0);
3160
3161 for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3162 if (strcmp(flags[i].name, flag) == 0)
3163 return flags[i].value;
3164
3165 return 0;
3166 }
3167
3168 static void print_str_to_seq(struct trace_seq *s, const char *format,
3169 int len_arg, const char *str)
3170 {
3171 if (len_arg >= 0)
3172 trace_seq_printf(s, format, len_arg, str);
3173 else
3174 trace_seq_printf(s, format, str);
3175 }
3176
3177 static void print_str_arg(struct trace_seq *s, void *data, int size,
3178 struct event_format *event, const char *format,
3179 int len_arg, struct print_arg *arg)
3180 {
3181 struct pevent *pevent = event->pevent;
3182 struct print_flag_sym *flag;
3183 unsigned long long val, fval;
3184 unsigned long addr;
3185 char *str;
3186 int print;
3187 int len;
3188
3189 switch (arg->type) {
3190 case PRINT_NULL:
3191 /* ?? */
3192 return;
3193 case PRINT_ATOM:
3194 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3195 return;
3196 case PRINT_FIELD:
3197 if (!arg->field.field) {
3198 arg->field.field = pevent_find_any_field(event, arg->field.name);
3199 if (!arg->field.field)
3200 die("field %s not found", arg->field.name);
3201 }
3202 /* Zero sized fields, mean the rest of the data */
3203 len = arg->field.field->size ? : size - arg->field.field->offset;
3204
3205 /*
3206 * Some events pass in pointers. If this is not an array
3207 * and the size is the same as long_size, assume that it
3208 * is a pointer.
3209 */
3210 if (!(arg->field.field->flags & FIELD_IS_ARRAY) &&
3211 arg->field.field->size == pevent->long_size) {
3212 addr = *(unsigned long *)(data + arg->field.field->offset);
3213 trace_seq_printf(s, "%lx", addr);
3214 break;
3215 }
3216 str = malloc_or_die(len + 1);
3217 memcpy(str, data + arg->field.field->offset, len);
3218 str[len] = 0;
3219 print_str_to_seq(s, format, len_arg, str);
3220 free(str);
3221 break;
3222 case PRINT_FLAGS:
3223 val = eval_num_arg(data, size, event, arg->flags.field);
3224 print = 0;
3225 for (flag = arg->flags.flags; flag; flag = flag->next) {
3226 fval = eval_flag(flag->value);
3227 if (!val && !fval) {
3228 print_str_to_seq(s, format, len_arg, flag->str);
3229 break;
3230 }
3231 if (fval && (val & fval) == fval) {
3232 if (print && arg->flags.delim)
3233 trace_seq_puts(s, arg->flags.delim);
3234 print_str_to_seq(s, format, len_arg, flag->str);
3235 print = 1;
3236 val &= ~fval;
3237 }
3238 }
3239 break;
3240 case PRINT_SYMBOL:
3241 val = eval_num_arg(data, size, event, arg->symbol.field);
3242 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3243 fval = eval_flag(flag->value);
3244 if (val == fval) {
3245 print_str_to_seq(s, format, len_arg, flag->str);
3246 break;
3247 }
3248 }
3249 break;
3250
3251 case PRINT_TYPE:
3252 break;
3253 case PRINT_STRING: {
3254 int str_offset;
3255
3256 if (arg->string.offset == -1) {
3257 struct format_field *f;
3258
3259 f = pevent_find_any_field(event, arg->string.string);
3260 arg->string.offset = f->offset;
3261 }
3262 str_offset = data2host4(pevent, data + arg->string.offset);
3263 str_offset &= 0xffff;
3264 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
3265 break;
3266 }
3267 case PRINT_BSTRING:
3268 trace_seq_printf(s, format, arg->string.string);
3269 break;
3270 case PRINT_OP:
3271 /*
3272 * The only op for string should be ? :
3273 */
3274 if (arg->op.op[0] != '?')
3275 return;
3276 val = eval_num_arg(data, size, event, arg->op.left);
3277 if (val)
3278 print_str_arg(s, data, size, event,
3279 format, len_arg, arg->op.right->op.left);
3280 else
3281 print_str_arg(s, data, size, event,
3282 format, len_arg, arg->op.right->op.right);
3283 break;
3284 case PRINT_FUNC:
3285 process_defined_func(s, data, size, event, arg);
3286 break;
3287 default:
3288 /* well... */
3289 break;
3290 }
3291 }
3292
3293 static unsigned long long
3294 process_defined_func(struct trace_seq *s, void *data, int size,
3295 struct event_format *event, struct print_arg *arg)
3296 {
3297 struct pevent_function_handler *func_handle = arg->func.func;
3298 struct pevent_func_params *param;
3299 unsigned long long *args;
3300 unsigned long long ret;
3301 struct print_arg *farg;
3302 struct trace_seq str;
3303 struct save_str {
3304 struct save_str *next;
3305 char *str;
3306 } *strings = NULL, *string;
3307 int i;
3308
3309 if (!func_handle->nr_args) {
3310 ret = (*func_handle->func)(s, NULL);
3311 goto out;
3312 }
3313
3314 farg = arg->func.args;
3315 param = func_handle->params;
3316
3317 args = malloc_or_die(sizeof(*args) * func_handle->nr_args);
3318 for (i = 0; i < func_handle->nr_args; i++) {
3319 switch (param->type) {
3320 case PEVENT_FUNC_ARG_INT:
3321 case PEVENT_FUNC_ARG_LONG:
3322 case PEVENT_FUNC_ARG_PTR:
3323 args[i] = eval_num_arg(data, size, event, farg);
3324 break;
3325 case PEVENT_FUNC_ARG_STRING:
3326 trace_seq_init(&str);
3327 print_str_arg(&str, data, size, event, "%s", -1, farg);
3328 trace_seq_terminate(&str);
3329 string = malloc_or_die(sizeof(*string));
3330 string->next = strings;
3331 string->str = strdup(str.buffer);
3332 strings = string;
3333 trace_seq_destroy(&str);
3334 break;
3335 default:
3336 /*
3337 * Something went totally wrong, this is not
3338 * an input error, something in this code broke.
3339 */
3340 die("Unexpected end of arguments\n");
3341 break;
3342 }
3343 farg = farg->next;
3344 }
3345
3346 ret = (*func_handle->func)(s, args);
3347 free(args);
3348 while (strings) {
3349 string = strings;
3350 strings = string->next;
3351 free(string->str);
3352 free(string);
3353 }
3354
3355 out:
3356 /* TBD : handle return type here */
3357 return ret;
3358 }
3359
3360 static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
3361 {
3362 struct pevent *pevent = event->pevent;
3363 struct format_field *field, *ip_field;
3364 struct print_arg *args, *arg, **next;
3365 unsigned long long ip, val;
3366 char *ptr;
3367 void *bptr;
3368
3369 field = pevent->bprint_buf_field;
3370 ip_field = pevent->bprint_ip_field;
3371
3372 if (!field) {
3373 field = pevent_find_field(event, "buf");
3374 if (!field)
3375 die("can't find buffer field for binary printk");
3376 ip_field = pevent_find_field(event, "ip");
3377 if (!ip_field)
3378 die("can't find ip field for binary printk");
3379 pevent->bprint_buf_field = field;
3380 pevent->bprint_ip_field = ip_field;
3381 }
3382
3383 ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
3384
3385 /*
3386 * The first arg is the IP pointer.
3387 */
3388 args = alloc_arg();
3389 arg = args;
3390 arg->next = NULL;
3391 next = &arg->next;
3392
3393 arg->type = PRINT_ATOM;
3394 arg->atom.atom = malloc_or_die(32);
3395 sprintf(arg->atom.atom, "%lld", ip);
3396
3397 /* skip the first "%pf : " */
3398 for (ptr = fmt + 6, bptr = data + field->offset;
3399 bptr < data + size && *ptr; ptr++) {
3400 int ls = 0;
3401
3402 if (*ptr == '%') {
3403 process_again:
3404 ptr++;
3405 switch (*ptr) {
3406 case '%':
3407 break;
3408 case 'l':
3409 ls++;
3410 goto process_again;
3411 case 'L':
3412 ls = 2;
3413 goto process_again;
3414 case '0' ... '9':
3415 goto process_again;
3416 case 'p':
3417 ls = 1;
3418 /* fall through */
3419 case 'd':
3420 case 'u':
3421 case 'x':
3422 case 'i':
3423 /* the pointers are always 4 bytes aligned */
3424 bptr = (void *)(((unsigned long)bptr + 3) &
3425 ~3);
3426 switch (ls) {
3427 case 0:
3428 ls = 4;
3429 break;
3430 case 1:
3431 ls = pevent->long_size;
3432 break;
3433 case 2:
3434 ls = 8;
3435 default:
3436 break;
3437 }
3438 val = pevent_read_number(pevent, bptr, ls);
3439 bptr += ls;
3440 arg = alloc_arg();
3441 arg->next = NULL;
3442 arg->type = PRINT_ATOM;
3443 arg->atom.atom = malloc_or_die(32);
3444 sprintf(arg->atom.atom, "%lld", val);
3445 *next = arg;
3446 next = &arg->next;
3447 break;
3448 case 's':
3449 arg = alloc_arg();
3450 arg->next = NULL;
3451 arg->type = PRINT_BSTRING;
3452 arg->string.string = strdup(bptr);
3453 bptr += strlen(bptr) + 1;
3454 *next = arg;
3455 next = &arg->next;
3456 default:
3457 break;
3458 }
3459 }
3460 }
3461
3462 return args;
3463 }
3464
3465 static void free_args(struct print_arg *args)
3466 {
3467 struct print_arg *next;
3468
3469 while (args) {
3470 next = args->next;
3471
3472 free_arg(args);
3473 args = next;
3474 }
3475 }
3476
3477 static char *
3478 get_bprint_format(void *data, int size __unused, struct event_format *event)
3479 {
3480 struct pevent *pevent = event->pevent;
3481 unsigned long long addr;
3482 struct format_field *field;
3483 struct printk_map *printk;
3484 char *format;
3485 char *p;
3486
3487 field = pevent->bprint_fmt_field;
3488
3489 if (!field) {
3490 field = pevent_find_field(event, "fmt");
3491 if (!field)
3492 die("can't find format field for binary printk");
3493 pevent->bprint_fmt_field = field;
3494 }
3495
3496 addr = pevent_read_number(pevent, data + field->offset, field->size);
3497
3498 printk = find_printk(pevent, addr);
3499 if (!printk) {
3500 format = malloc_or_die(45);
3501 sprintf(format, "%%pf : (NO FORMAT FOUND at %llx)\n",
3502 addr);
3503 return format;
3504 }
3505
3506 p = printk->printk;
3507 /* Remove any quotes. */
3508 if (*p == '"')
3509 p++;
3510 format = malloc_or_die(strlen(p) + 10);
3511 sprintf(format, "%s : %s", "%pf", p);
3512 /* remove ending quotes and new line since we will add one too */
3513 p = format + strlen(format) - 1;
3514 if (*p == '"')
3515 *p = 0;
3516
3517 p -= 2;
3518 if (strcmp(p, "\\n") == 0)
3519 *p = 0;
3520
3521 return format;
3522 }
3523
3524 static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
3525 struct event_format *event, struct print_arg *arg)
3526 {
3527 unsigned char *buf;
3528 char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
3529
3530 if (arg->type == PRINT_FUNC) {
3531 process_defined_func(s, data, size, event, arg);
3532 return;
3533 }
3534
3535 if (arg->type != PRINT_FIELD) {
3536 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
3537 arg->type);
3538 return;
3539 }
3540
3541 if (mac == 'm')
3542 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
3543 if (!arg->field.field) {
3544 arg->field.field =
3545 pevent_find_any_field(event, arg->field.name);
3546 if (!arg->field.field)
3547 die("field %s not found", arg->field.name);
3548 }
3549 if (arg->field.field->size != 6) {
3550 trace_seq_printf(s, "INVALIDMAC");
3551 return;
3552 }
3553 buf = data + arg->field.field->offset;
3554 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
3555 }
3556
3557 static void print_event_fields(struct trace_seq *s, void *data, int size,
3558 struct event_format *event)
3559 {
3560 struct format_field *field;
3561 unsigned long long val;
3562 unsigned int offset, len, i;
3563
3564 field = event->format.fields;
3565 while (field) {
3566 trace_seq_printf(s, " %s=", field->name);
3567 if (field->flags & FIELD_IS_ARRAY) {
3568 offset = field->offset;
3569 len = field->size;
3570 if (field->flags & FIELD_IS_DYNAMIC) {
3571 val = pevent_read_number(event->pevent, data + offset, len);
3572 offset = val;
3573 len = offset >> 16;
3574 offset &= 0xffff;
3575 }
3576 if (field->flags & FIELD_IS_STRING) {
3577 trace_seq_printf(s, "%s", (char *)data + offset);
3578 } else {
3579 trace_seq_puts(s, "ARRAY[");
3580 for (i = 0; i < len; i++) {
3581 if (i)
3582 trace_seq_puts(s, ", ");
3583 trace_seq_printf(s, "%02x",
3584 *((unsigned char *)data + offset + i));
3585 }
3586 trace_seq_putc(s, ']');
3587 }
3588 } else {
3589 val = pevent_read_number(event->pevent, data + field->offset,
3590 field->size);
3591 if (field->flags & FIELD_IS_POINTER) {
3592 trace_seq_printf(s, "0x%llx", val);
3593 } else if (field->flags & FIELD_IS_SIGNED) {
3594 switch (field->size) {
3595 case 4:
3596 /*
3597 * If field is long then print it in hex.
3598 * A long usually stores pointers.
3599 */
3600 if (field->flags & FIELD_IS_LONG)
3601 trace_seq_printf(s, "0x%x", (int)val);
3602 else
3603 trace_seq_printf(s, "%d", (int)val);
3604 break;
3605 case 2:
3606 trace_seq_printf(s, "%2d", (short)val);
3607 break;
3608 case 1:
3609 trace_seq_printf(s, "%1d", (char)val);
3610 break;
3611 default:
3612 trace_seq_printf(s, "%lld", val);
3613 }
3614 } else {
3615 if (field->flags & FIELD_IS_LONG)
3616 trace_seq_printf(s, "0x%llx", val);
3617 else
3618 trace_seq_printf(s, "%llu", val);
3619 }
3620 }
3621 field = field->next;
3622 }
3623 }
3624
3625 static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
3626 {
3627 struct pevent *pevent = event->pevent;
3628 struct print_fmt *print_fmt = &event->print_fmt;
3629 struct print_arg *arg = print_fmt->args;
3630 struct print_arg *args = NULL;
3631 const char *ptr = print_fmt->format;
3632 unsigned long long val;
3633 struct func_map *func;
3634 const char *saveptr;
3635 char *bprint_fmt = NULL;
3636 char format[32];
3637 int show_func;
3638 int len_as_arg;
3639 int len_arg;
3640 int len;
3641 int ls;
3642
3643 if (event->flags & EVENT_FL_FAILED) {
3644 trace_seq_printf(s, "[FAILED TO PARSE]");
3645 print_event_fields(s, data, size, event);
3646 return;
3647 }
3648
3649 if (event->flags & EVENT_FL_ISBPRINT) {
3650 bprint_fmt = get_bprint_format(data, size, event);
3651 args = make_bprint_args(bprint_fmt, data, size, event);
3652 arg = args;
3653 ptr = bprint_fmt;
3654 }
3655
3656 for (; *ptr; ptr++) {
3657 ls = 0;
3658 if (*ptr == '\\') {
3659 ptr++;
3660 switch (*ptr) {
3661 case 'n':
3662 trace_seq_putc(s, '\n');
3663 break;
3664 case 't':
3665 trace_seq_putc(s, '\t');
3666 break;
3667 case 'r':
3668 trace_seq_putc(s, '\r');
3669 break;
3670 case '\\':
3671 trace_seq_putc(s, '\\');
3672 break;
3673 default:
3674 trace_seq_putc(s, *ptr);
3675 break;
3676 }
3677
3678 } else if (*ptr == '%') {
3679 saveptr = ptr;
3680 show_func = 0;
3681 len_as_arg = 0;
3682 cont_process:
3683 ptr++;
3684 switch (*ptr) {
3685 case '%':
3686 trace_seq_putc(s, '%');
3687 break;
3688 case '#':
3689 /* FIXME: need to handle properly */
3690 goto cont_process;
3691 case 'h':
3692 ls--;
3693 goto cont_process;
3694 case 'l':
3695 ls++;
3696 goto cont_process;
3697 case 'L':
3698 ls = 2;
3699 goto cont_process;
3700 case '*':
3701 /* The argument is the length. */
3702 if (!arg)
3703 die("no argument match");
3704 len_arg = eval_num_arg(data, size, event, arg);
3705 len_as_arg = 1;
3706 arg = arg->next;
3707 goto cont_process;
3708 case '.':
3709 case 'z':
3710 case 'Z':
3711 case '0' ... '9':
3712 goto cont_process;
3713 case 'p':
3714 if (pevent->long_size == 4)
3715 ls = 1;
3716 else
3717 ls = 2;
3718
3719 if (*(ptr+1) == 'F' ||
3720 *(ptr+1) == 'f') {
3721 ptr++;
3722 show_func = *ptr;
3723 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
3724 print_mac_arg(s, *(ptr+1), data, size, event, arg);
3725 ptr++;
3726 break;
3727 }
3728
3729 /* fall through */
3730 case 'd':
3731 case 'i':
3732 case 'x':
3733 case 'X':
3734 case 'u':
3735 if (!arg)
3736 die("no argument match");
3737
3738 len = ((unsigned long)ptr + 1) -
3739 (unsigned long)saveptr;
3740
3741 /* should never happen */
3742 if (len > 31)
3743 die("bad format!");
3744
3745 memcpy(format, saveptr, len);
3746 format[len] = 0;
3747
3748 val = eval_num_arg(data, size, event, arg);
3749 arg = arg->next;
3750
3751 if (show_func) {
3752 func = find_func(pevent, val);
3753 if (func) {
3754 trace_seq_puts(s, func->func);
3755 if (show_func == 'F')
3756 trace_seq_printf(s,
3757 "+0x%llx",
3758 val - func->addr);
3759 break;
3760 }
3761 }
3762 if (pevent->long_size == 8 && ls) {
3763 char *p;
3764
3765 ls = 2;
3766 /* make %l into %ll */
3767 p = strchr(format, 'l');
3768 if (p)
3769 memmove(p, p+1, strlen(p)+1);
3770 else if (strcmp(format, "%p") == 0)
3771 strcpy(format, "0x%llx");
3772 }
3773 switch (ls) {
3774 case -2:
3775 if (len_as_arg)
3776 trace_seq_printf(s, format, len_arg, (char)val);
3777 else
3778 trace_seq_printf(s, format, (char)val);
3779 break;
3780 case -1:
3781 if (len_as_arg)
3782 trace_seq_printf(s, format, len_arg, (short)val);
3783 else
3784 trace_seq_printf(s, format, (short)val);
3785 break;
3786 case 0:
3787 if (len_as_arg)
3788 trace_seq_printf(s, format, len_arg, (int)val);
3789 else
3790 trace_seq_printf(s, format, (int)val);
3791 break;
3792 case 1:
3793 if (len_as_arg)
3794 trace_seq_printf(s, format, len_arg, (long)val);
3795 else
3796 trace_seq_printf(s, format, (long)val);
3797 break;
3798 case 2:
3799 if (len_as_arg)
3800 trace_seq_printf(s, format, len_arg,
3801 (long long)val);
3802 else
3803 trace_seq_printf(s, format, (long long)val);
3804 break;
3805 default:
3806 die("bad count (%d)", ls);
3807 }
3808 break;
3809 case 's':
3810 if (!arg)
3811 die("no matching argument");
3812
3813 len = ((unsigned long)ptr + 1) -
3814 (unsigned long)saveptr;
3815
3816 /* should never happen */
3817 if (len > 31)
3818 die("bad format!");
3819
3820 memcpy(format, saveptr, len);
3821 format[len] = 0;
3822 if (!len_as_arg)
3823 len_arg = -1;
3824 print_str_arg(s, data, size, event,
3825 format, len_arg, arg);
3826 arg = arg->next;
3827 break;
3828 default:
3829 trace_seq_printf(s, ">%c<", *ptr);
3830
3831 }
3832 } else
3833 trace_seq_putc(s, *ptr);
3834 }
3835
3836 if (args) {
3837 free_args(args);
3838 free(bprint_fmt);
3839 }
3840 }
3841
3842 /**
3843 * pevent_data_lat_fmt - parse the data for the latency format
3844 * @pevent: a handle to the pevent
3845 * @s: the trace_seq to write to
3846 * @data: the raw data to read from
3847 * @size: currently unused.
3848 *
3849 * This parses out the Latency format (interrupts disabled,
3850 * need rescheduling, in hard/soft interrupt, preempt count
3851 * and lock depth) and places it into the trace_seq.
3852 */
3853 void pevent_data_lat_fmt(struct pevent *pevent,
3854 struct trace_seq *s, struct record *record)
3855 {
3856 static int check_lock_depth = 1;
3857 static int lock_depth_exists;
3858 unsigned int lat_flags;
3859 unsigned int pc;
3860 int lock_depth;
3861 int hardirq;
3862 int softirq;
3863 void *data = record->data;
3864
3865 lat_flags = parse_common_flags(pevent, data);
3866 pc = parse_common_pc(pevent, data);
3867 /* lock_depth may not always exist */
3868 if (check_lock_depth) {
3869 struct format_field *field;
3870 struct event_format *event;
3871
3872 check_lock_depth = 0;
3873 event = pevent->events[0];
3874 field = pevent_find_common_field(event, "common_lock_depth");
3875 if (field)
3876 lock_depth_exists = 1;
3877 }
3878 if (lock_depth_exists)
3879 lock_depth = parse_common_lock_depth(pevent, data);
3880
3881 hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
3882 softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
3883
3884 trace_seq_printf(s, "%c%c%c",
3885 (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
3886 (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
3887 'X' : '.',
3888 (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
3889 'N' : '.',
3890 (hardirq && softirq) ? 'H' :
3891 hardirq ? 'h' : softirq ? 's' : '.');
3892
3893 if (pc)
3894 trace_seq_printf(s, "%x", pc);
3895 else
3896 trace_seq_putc(s, '.');
3897
3898 if (lock_depth_exists) {
3899 if (lock_depth < 0)
3900 trace_seq_putc(s, '.');
3901 else
3902 trace_seq_printf(s, "%d", lock_depth);
3903 }
3904
3905 trace_seq_terminate(s);
3906 }
3907
3908 /**
3909 * pevent_data_type - parse out the given event type
3910 * @pevent: a handle to the pevent
3911 * @rec: the record to read from
3912 *
3913 * This returns the event id from the @rec.
3914 */
3915 int pevent_data_type(struct pevent *pevent, struct record *rec)
3916 {
3917 return trace_parse_common_type(pevent, rec->data);
3918 }
3919
3920 /**
3921 * pevent_data_event_from_type - find the event by a given type
3922 * @pevent: a handle to the pevent
3923 * @type: the type of the event.
3924 *
3925 * This returns the event form a given @type;
3926 */
3927 struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
3928 {
3929 return pevent_find_event(pevent, type);
3930 }
3931
3932 /**
3933 * pevent_data_pid - parse the PID from raw data
3934 * @pevent: a handle to the pevent
3935 * @rec: the record to parse
3936 *
3937 * This returns the PID from a raw data.
3938 */
3939 int pevent_data_pid(struct pevent *pevent, struct record *rec)
3940 {
3941 return parse_common_pid(pevent, rec->data);
3942 }
3943
3944 /**
3945 * pevent_data_comm_from_pid - return the command line from PID
3946 * @pevent: a handle to the pevent
3947 * @pid: the PID of the task to search for
3948 *
3949 * This returns a pointer to the command line that has the given
3950 * @pid.
3951 */
3952 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
3953 {
3954 const char *comm;
3955
3956 comm = find_cmdline(pevent, pid);
3957 return comm;
3958 }
3959
3960 /**
3961 * pevent_data_comm_from_pid - parse the data into the print format
3962 * @s: the trace_seq to write to
3963 * @event: the handle to the event
3964 * @cpu: the cpu the event was recorded on
3965 * @data: the raw data
3966 * @size: the size of the raw data
3967 * @nsecs: the timestamp of the event
3968 *
3969 * This parses the raw @data using the given @event information and
3970 * writes the print format into the trace_seq.
3971 */
3972 void pevent_event_info(struct trace_seq *s, struct event_format *event,
3973 struct record *record)
3974 {
3975 int print_pretty = 1;
3976
3977 if (event->pevent->print_raw)
3978 print_event_fields(s, record->data, record->size, event);
3979 else {
3980
3981 if (event->handler)
3982 print_pretty = event->handler(s, record, event,
3983 event->context);
3984
3985 if (print_pretty)
3986 pretty_print(s, record->data, record->size, event);
3987 }
3988
3989 trace_seq_terminate(s);
3990 }
3991
3992 void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
3993 struct record *record)
3994 {
3995 static char *spaces = " "; /* 20 spaces */
3996 struct event_format *event;
3997 unsigned long secs;
3998 unsigned long usecs;
3999 unsigned long nsecs;
4000 const char *comm;
4001 void *data = record->data;
4002 int type;
4003 int pid;
4004 int len;
4005 int p;
4006
4007 secs = record->ts / NSECS_PER_SEC;
4008 nsecs = record->ts - secs * NSECS_PER_SEC;
4009
4010 if (record->size < 0) {
4011 do_warning("ug! negative record size %d", record->size);
4012 return;
4013 }
4014
4015 type = trace_parse_common_type(pevent, data);
4016
4017 event = pevent_find_event(pevent, type);
4018 if (!event) {
4019 do_warning("ug! no event found for type %d", type);
4020 return;
4021 }
4022
4023 pid = parse_common_pid(pevent, data);
4024 comm = find_cmdline(pevent, pid);
4025
4026 if (pevent->latency_format) {
4027 trace_seq_printf(s, "%8.8s-%-5d %3d",
4028 comm, pid, record->cpu);
4029 pevent_data_lat_fmt(pevent, s, record);
4030 } else
4031 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
4032
4033 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
4034 usecs = nsecs;
4035 p = 9;
4036 } else {
4037 usecs = (nsecs + 500) / NSECS_PER_USEC;
4038 p = 6;
4039 }
4040
4041 trace_seq_printf(s, " %5lu.%0*lu: %s: ", secs, p, usecs, event->name);
4042
4043 /* Space out the event names evenly. */
4044 len = strlen(event->name);
4045 if (len < 20)
4046 trace_seq_printf(s, "%.*s", 20 - len, spaces);
4047
4048 pevent_event_info(s, event, record);
4049 }
4050
4051 static int events_id_cmp(const void *a, const void *b)
4052 {
4053 struct event_format * const * ea = a;
4054 struct event_format * const * eb = b;
4055
4056 if ((*ea)->id < (*eb)->id)
4057 return -1;
4058
4059 if ((*ea)->id > (*eb)->id)
4060 return 1;
4061
4062 return 0;
4063 }
4064
4065 static int events_name_cmp(const void *a, const void *b)
4066 {
4067 struct event_format * const * ea = a;
4068 struct event_format * const * eb = b;
4069 int res;
4070
4071 res = strcmp((*ea)->name, (*eb)->name);
4072 if (res)
4073 return res;
4074
4075 res = strcmp((*ea)->system, (*eb)->system);
4076 if (res)
4077 return res;
4078
4079 return events_id_cmp(a, b);
4080 }
4081
4082 static int events_system_cmp(const void *a, const void *b)
4083 {
4084 struct event_format * const * ea = a;
4085 struct event_format * const * eb = b;
4086 int res;
4087
4088 res = strcmp((*ea)->system, (*eb)->system);
4089 if (res)
4090 return res;
4091
4092 res = strcmp((*ea)->name, (*eb)->name);
4093 if (res)
4094 return res;
4095
4096 return events_id_cmp(a, b);
4097 }
4098
4099 struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
4100 {
4101 struct event_format **events;
4102 int (*sort)(const void *a, const void *b);
4103
4104 events = pevent->sort_events;
4105
4106 if (events && pevent->last_type == sort_type)
4107 return events;
4108
4109 if (!events) {
4110 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
4111 if (!events)
4112 return NULL;
4113
4114 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
4115 events[pevent->nr_events] = NULL;
4116
4117 pevent->sort_events = events;
4118
4119 /* the internal events are sorted by id */
4120 if (sort_type == EVENT_SORT_ID) {
4121 pevent->last_type = sort_type;
4122 return events;
4123 }
4124 }
4125
4126 switch (sort_type) {
4127 case EVENT_SORT_ID:
4128 sort = events_id_cmp;
4129 break;
4130 case EVENT_SORT_NAME:
4131 sort = events_name_cmp;
4132 break;
4133 case EVENT_SORT_SYSTEM:
4134 sort = events_system_cmp;
4135 break;
4136 default:
4137 return events;
4138 }
4139
4140 qsort(events, pevent->nr_events, sizeof(*events), sort);
4141 pevent->last_type = sort_type;
4142
4143 return events;
4144 }
4145
4146 static struct format_field **
4147 get_event_fields(const char *type, const char *name,
4148 int count, struct format_field *list)
4149 {
4150 struct format_field **fields;
4151 struct format_field *field;
4152 int i = 0;
4153
4154 fields = malloc_or_die(sizeof(*fields) * (count + 1));
4155 for (field = list; field; field = field->next) {
4156 fields[i++] = field;
4157 if (i == count + 1) {
4158 do_warning("event %s has more %s fields than specified",
4159 name, type);
4160 i--;
4161 break;
4162 }
4163 }
4164
4165 if (i != count)
4166 do_warning("event %s has less %s fields than specified",
4167 name, type);
4168
4169 fields[i] = NULL;
4170
4171 return fields;
4172 }
4173
4174 /**
4175 * pevent_event_common_fields - return a list of common fields for an event
4176 * @event: the event to return the common fields of.
4177 *
4178 * Returns an allocated array of fields. The last item in the array is NULL.
4179 * The array must be freed with free().
4180 */
4181 struct format_field **pevent_event_common_fields(struct event_format *event)
4182 {
4183 return get_event_fields("common", event->name,
4184 event->format.nr_common,
4185 event->format.common_fields);
4186 }
4187
4188 /**
4189 * pevent_event_fields - return a list of event specific fields for an event
4190 * @event: the event to return the fields of.
4191 *
4192 * Returns an allocated array of fields. The last item in the array is NULL.
4193 * The array must be freed with free().
4194 */
4195 struct format_field **pevent_event_fields(struct event_format *event)
4196 {
4197 return get_event_fields("event", event->name,
4198 event->format.nr_fields,
4199 event->format.fields);
4200 }
4201
4202 static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
4203 {
4204 trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
4205 if (field->next) {
4206 trace_seq_puts(s, ", ");
4207 print_fields(s, field->next);
4208 }
4209 }
4210
4211 /* for debugging */
4212 static void print_args(struct print_arg *args)
4213 {
4214 int print_paren = 1;
4215 struct trace_seq s;
4216
4217 switch (args->type) {
4218 case PRINT_NULL:
4219 printf("null");
4220 break;
4221 case PRINT_ATOM:
4222 printf("%s", args->atom.atom);
4223 break;
4224 case PRINT_FIELD:
4225 printf("REC->%s", args->field.name);
4226 break;
4227 case PRINT_FLAGS:
4228 printf("__print_flags(");
4229 print_args(args->flags.field);
4230 printf(", %s, ", args->flags.delim);
4231 trace_seq_init(&s);
4232 print_fields(&s, args->flags.flags);
4233 trace_seq_do_printf(&s);
4234 trace_seq_destroy(&s);
4235 printf(")");
4236 break;
4237 case PRINT_SYMBOL:
4238 printf("__print_symbolic(");
4239 print_args(args->symbol.field);
4240 printf(", ");
4241 trace_seq_init(&s);
4242 print_fields(&s, args->symbol.symbols);
4243 trace_seq_do_printf(&s);
4244 trace_seq_destroy(&s);
4245 printf(")");
4246 break;
4247 case PRINT_STRING:
4248 case PRINT_BSTRING:
4249 printf("__get_str(%s)", args->string.string);
4250 break;
4251 case PRINT_TYPE:
4252 printf("(%s)", args->typecast.type);
4253 print_args(args->typecast.item);
4254 break;
4255 case PRINT_OP:
4256 if (strcmp(args->op.op, ":") == 0)
4257 print_paren = 0;
4258 if (print_paren)
4259 printf("(");
4260 print_args(args->op.left);
4261 printf(" %s ", args->op.op);
4262 print_args(args->op.right);
4263 if (print_paren)
4264 printf(")");
4265 break;
4266 default:
4267 /* we should warn... */
4268 return;
4269 }
4270 if (args->next) {
4271 printf("\n");
4272 print_args(args->next);
4273 }
4274 }
4275
4276 static void parse_header_field(const char *field,
4277 int *offset, int *size, int mandatory)
4278 {
4279 unsigned long long save_input_buf_ptr;
4280 unsigned long long save_input_buf_siz;
4281 char *token;
4282 int type;
4283
4284 save_input_buf_ptr = input_buf_ptr;
4285 save_input_buf_siz = input_buf_siz;
4286
4287 if (read_expected(EVENT_ITEM, "field") < 0)
4288 return;
4289 if (read_expected(EVENT_OP, ":") < 0)
4290 return;
4291
4292 /* type */
4293 if (read_expect_type(EVENT_ITEM, &token) < 0)
4294 goto fail;
4295 free_token(token);
4296
4297 /*
4298 * If this is not a mandatory field, then test it first.
4299 */
4300 if (mandatory) {
4301 if (read_expected(EVENT_ITEM, field) < 0)
4302 return;
4303 } else {
4304 if (read_expect_type(EVENT_ITEM, &token) < 0)
4305 goto fail;
4306 if (strcmp(token, field) != 0)
4307 goto discard;
4308 free_token(token);
4309 }
4310
4311 if (read_expected(EVENT_OP, ";") < 0)
4312 return;
4313 if (read_expected(EVENT_ITEM, "offset") < 0)
4314 return;
4315 if (read_expected(EVENT_OP, ":") < 0)
4316 return;
4317 if (read_expect_type(EVENT_ITEM, &token) < 0)
4318 goto fail;
4319 *offset = atoi(token);
4320 free_token(token);
4321 if (read_expected(EVENT_OP, ";") < 0)
4322 return;
4323 if (read_expected(EVENT_ITEM, "size") < 0)
4324 return;
4325 if (read_expected(EVENT_OP, ":") < 0)
4326 return;
4327 if (read_expect_type(EVENT_ITEM, &token) < 0)
4328 goto fail;
4329 *size = atoi(token);
4330 free_token(token);
4331 if (read_expected(EVENT_OP, ";") < 0)
4332 return;
4333 type = read_token(&token);
4334 if (type != EVENT_NEWLINE) {
4335 /* newer versions of the kernel have a "signed" type */
4336 if (type != EVENT_ITEM)
4337 goto fail;
4338
4339 if (strcmp(token, "signed") != 0)
4340 goto fail;
4341
4342 free_token(token);
4343
4344 if (read_expected(EVENT_OP, ":") < 0)
4345 return;
4346
4347 if (read_expect_type(EVENT_ITEM, &token))
4348 goto fail;
4349
4350 free_token(token);
4351 if (read_expected(EVENT_OP, ";") < 0)
4352 return;
4353
4354 if (read_expect_type(EVENT_NEWLINE, &token))
4355 goto fail;
4356 }
4357 fail:
4358 free_token(token);
4359 return;
4360
4361 discard:
4362 input_buf_ptr = save_input_buf_ptr;
4363 input_buf_siz = save_input_buf_siz;
4364 *offset = 0;
4365 *size = 0;
4366 free_token(token);
4367 }
4368
4369 /**
4370 * pevent_parse_header_page - parse the data stored in the header page
4371 * @pevent: the handle to the pevent
4372 * @buf: the buffer storing the header page format string
4373 * @size: the size of @buf
4374 * @long_size: the long size to use if there is no header
4375 *
4376 * This parses the header page format for information on the
4377 * ring buffer used. The @buf should be copied from
4378 *
4379 * /sys/kernel/debug/tracing/events/header_page
4380 */
4381 int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
4382 int long_size)
4383 {
4384 int ignore;
4385
4386 if (!size) {
4387 /*
4388 * Old kernels did not have header page info.
4389 * Sorry but we just use what we find here in user space.
4390 */
4391 pevent->header_page_ts_size = sizeof(long long);
4392 pevent->header_page_size_size = long_size;
4393 pevent->header_page_data_offset = sizeof(long long) + long_size;
4394 pevent->old_format = 1;
4395 return -1;
4396 }
4397 init_input_buf(buf, size);
4398
4399 parse_header_field("timestamp", &pevent->header_page_ts_offset,
4400 &pevent->header_page_ts_size, 1);
4401 parse_header_field("commit", &pevent->header_page_size_offset,
4402 &pevent->header_page_size_size, 1);
4403 parse_header_field("overwrite", &pevent->header_page_overwrite,
4404 &ignore, 0);
4405 parse_header_field("data", &pevent->header_page_data_offset,
4406 &pevent->header_page_data_size, 1);
4407
4408 return 0;
4409 }
4410
4411 static int event_matches(struct event_format *event,
4412 int id, const char *sys_name,
4413 const char *event_name)
4414 {
4415 if (id >= 0 && id != event->id)
4416 return 0;
4417
4418 if (event_name && (strcmp(event_name, event->name) != 0))
4419 return 0;
4420
4421 if (sys_name && (strcmp(sys_name, event->system) != 0))
4422 return 0;
4423
4424 return 1;
4425 }
4426
4427 static void free_handler(struct event_handler *handle)
4428 {
4429 free((void *)handle->sys_name);
4430 free((void *)handle->event_name);
4431 free(handle);
4432 }
4433
4434 static int find_event_handle(struct pevent *pevent, struct event_format *event)
4435 {
4436 struct event_handler *handle, **next;
4437
4438 for (next = &pevent->handlers; *next;
4439 next = &(*next)->next) {
4440 handle = *next;
4441 if (event_matches(event, handle->id,
4442 handle->sys_name,
4443 handle->event_name))
4444 break;
4445 }
4446
4447 if (!(*next))
4448 return 0;
4449
4450 pr_stat("overriding event (%d) %s:%s with new print handler",
4451 event->id, event->system, event->name);
4452
4453 event->handler = handle->func;
4454 event->context = handle->context;
4455
4456 *next = handle->next;
4457 free_handler(handle);
4458
4459 return 1;
4460 }
4461
4462 /**
4463 * pevent_parse_event - parse the event format
4464 * @pevent: the handle to the pevent
4465 * @buf: the buffer storing the event format string
4466 * @size: the size of @buf
4467 * @sys: the system the event belongs to
4468 *
4469 * This parses the event format and creates an event structure
4470 * to quickly parse raw data for a given event.
4471 *
4472 * These files currently come from:
4473 *
4474 * /sys/kernel/debug/tracing/events/.../.../format
4475 */
4476 int pevent_parse_event(struct pevent *pevent,
4477 const char *buf, unsigned long size,
4478 const char *sys)
4479 {
4480 struct event_format *event;
4481 int ret;
4482
4483 init_input_buf(buf, size);
4484
4485 event = alloc_event();
4486 if (!event)
4487 return -ENOMEM;
4488
4489 event->name = event_read_name();
4490 if (!event->name) {
4491 /* Bad event? */
4492 free(event);
4493 return -1;
4494 }
4495
4496 if (strcmp(sys, "ftrace") == 0) {
4497
4498 event->flags |= EVENT_FL_ISFTRACE;
4499
4500 if (strcmp(event->name, "bprint") == 0)
4501 event->flags |= EVENT_FL_ISBPRINT;
4502 }
4503
4504 event->id = event_read_id();
4505 if (event->id < 0)
4506 die("failed to read event id");
4507
4508 event->system = strdup(sys);
4509
4510 /* Add pevent to event so that it can be referenced */
4511 event->pevent = pevent;
4512
4513 ret = event_read_format(event);
4514 if (ret < 0) {
4515 do_warning("failed to read event format for %s", event->name);
4516 goto event_failed;
4517 }
4518
4519 /*
4520 * If the event has an override, don't print warnings if the event
4521 * print format fails to parse.
4522 */
4523 if (find_event_handle(pevent, event))
4524 show_warning = 0;
4525
4526 ret = event_read_print(event);
4527 if (ret < 0) {
4528 do_warning("failed to read event print fmt for %s",
4529 event->name);
4530 show_warning = 1;
4531 goto event_failed;
4532 }
4533 show_warning = 1;
4534
4535 add_event(pevent, event);
4536
4537 if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
4538 struct format_field *field;
4539 struct print_arg *arg, **list;
4540
4541 /* old ftrace had no args */
4542
4543 list = &event->print_fmt.args;
4544 for (field = event->format.fields; field; field = field->next) {
4545 arg = alloc_arg();
4546 *list = arg;
4547 list = &arg->next;
4548 arg->type = PRINT_FIELD;
4549 arg->field.name = strdup(field->name);
4550 arg->field.field = field;
4551 }
4552 return 0;
4553 }
4554
4555 #define PRINT_ARGS 0
4556 if (PRINT_ARGS && event->print_fmt.args)
4557 print_args(event->print_fmt.args);
4558
4559 return 0;
4560
4561 event_failed:
4562 event->flags |= EVENT_FL_FAILED;
4563 /* still add it even if it failed */
4564 add_event(pevent, event);
4565 return -1;
4566 }
4567
4568 int get_field_val(struct trace_seq *s, struct format_field *field,
4569 const char *name, struct record *record,
4570 unsigned long long *val, int err)
4571 {
4572 if (!field) {
4573 if (err)
4574 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4575 return -1;
4576 }
4577
4578 if (pevent_read_number_field(field, record->data, val)) {
4579 if (err)
4580 trace_seq_printf(s, " %s=INVALID", name);
4581 return -1;
4582 }
4583
4584 return 0;
4585 }
4586
4587 /**
4588 * pevent_get_field_raw - return the raw pointer into the data field
4589 * @s: The seq to print to on error
4590 * @event: the event that the field is for
4591 * @name: The name of the field
4592 * @record: The record with the field name.
4593 * @len: place to store the field length.
4594 * @err: print default error if failed.
4595 *
4596 * Returns a pointer into record->data of the field and places
4597 * the length of the field in @len.
4598 *
4599 * On failure, it returns NULL.
4600 */
4601 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
4602 const char *name, struct record *record,
4603 int *len, int err)
4604 {
4605 struct format_field *field;
4606 void *data = record->data;
4607 unsigned offset;
4608 int dummy;
4609
4610 if (!event)
4611 return NULL;
4612
4613 field = pevent_find_field(event, name);
4614
4615 if (!field) {
4616 if (err)
4617 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4618 return NULL;
4619 }
4620
4621 /* Allow @len to be NULL */
4622 if (!len)
4623 len = &dummy;
4624
4625 offset = field->offset;
4626 if (field->flags & FIELD_IS_DYNAMIC) {
4627 offset = pevent_read_number(event->pevent,
4628 data + offset, field->size);
4629 *len = offset >> 16;
4630 offset &= 0xffff;
4631 } else
4632 *len = field->size;
4633
4634 return data + offset;
4635 }
4636
4637 /**
4638 * pevent_get_field_val - find a field and return its value
4639 * @s: The seq to print to on error
4640 * @event: the event that the field is for
4641 * @name: The name of the field
4642 * @record: The record with the field name.
4643 * @val: place to store the value of the field.
4644 * @err: print default error if failed.
4645 *
4646 * Returns 0 on success -1 on field not found.
4647 */
4648 int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
4649 const char *name, struct record *record,
4650 unsigned long long *val, int err)
4651 {
4652 struct format_field *field;
4653
4654 if (!event)
4655 return -1;
4656
4657 field = pevent_find_field(event, name);
4658
4659 return get_field_val(s, field, name, record, val, err);
4660 }
4661
4662 /**
4663 * pevent_get_common_field_val - find a common field and return its value
4664 * @s: The seq to print to on error
4665 * @event: the event that the field is for
4666 * @name: The name of the field
4667 * @record: The record with the field name.
4668 * @val: place to store the value of the field.
4669 * @err: print default error if failed.
4670 *
4671 * Returns 0 on success -1 on field not found.
4672 */
4673 int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
4674 const char *name, struct record *record,
4675 unsigned long long *val, int err)
4676 {
4677 struct format_field *field;
4678
4679 if (!event)
4680 return -1;
4681
4682 field = pevent_find_common_field(event, name);
4683
4684 return get_field_val(s, field, name, record, val, err);
4685 }
4686
4687 /**
4688 * pevent_get_any_field_val - find a any field and return its value
4689 * @s: The seq to print to on error
4690 * @event: the event that the field is for
4691 * @name: The name of the field
4692 * @record: The record with the field name.
4693 * @val: place to store the value of the field.
4694 * @err: print default error if failed.
4695 *
4696 * Returns 0 on success -1 on field not found.
4697 */
4698 int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
4699 const char *name, struct record *record,
4700 unsigned long long *val, int err)
4701 {
4702 struct format_field *field;
4703
4704 if (!event)
4705 return -1;
4706
4707 field = pevent_find_any_field(event, name);
4708
4709 return get_field_val(s, field, name, record, val, err);
4710 }
4711
4712 /**
4713 * pevent_print_num_field - print a field and a format
4714 * @s: The seq to print to
4715 * @fmt: The printf format to print the field with.
4716 * @event: the event that the field is for
4717 * @name: The name of the field
4718 * @record: The record with the field name.
4719 * @err: print default error if failed.
4720 *
4721 * Returns: 0 on success, -1 field not fould, or 1 if buffer is full.
4722 */
4723 int pevent_print_num_field(struct trace_seq *s, const char *fmt,
4724 struct event_format *event, const char *name,
4725 struct record *record, int err)
4726 {
4727 struct format_field *field = pevent_find_field(event, name);
4728 unsigned long long val;
4729
4730 if (!field)
4731 goto failed;
4732
4733 if (pevent_read_number_field(field, record->data, &val))
4734 goto failed;
4735
4736 return trace_seq_printf(s, fmt, val);
4737
4738 failed:
4739 if (err)
4740 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
4741 return -1;
4742 }
4743
4744 static void free_func_handle(struct pevent_function_handler *func)
4745 {
4746 struct pevent_func_params *params;
4747
4748 free(func->name);
4749
4750 while (func->params) {
4751 params = func->params;
4752 func->params = params->next;
4753 free(params);
4754 }
4755
4756 free(func);
4757 }
4758
4759 /**
4760 * pevent_register_print_function - register a helper function
4761 * @pevent: the handle to the pevent
4762 * @func: the function to process the helper function
4763 * @name: the name of the helper function
4764 * @parameters: A list of enum pevent_func_arg_type
4765 *
4766 * Some events may have helper functions in the print format arguments.
4767 * This allows a plugin to dynmically create a way to process one
4768 * of these functions.
4769 *
4770 * The @parameters is a variable list of pevent_func_arg_type enums that
4771 * must end with PEVENT_FUNC_ARG_VOID.
4772 */
4773 int pevent_register_print_function(struct pevent *pevent,
4774 pevent_func_handler func,
4775 enum pevent_func_arg_type ret_type,
4776 char *name, ...)
4777 {
4778 struct pevent_function_handler *func_handle;
4779 struct pevent_func_params **next_param;
4780 struct pevent_func_params *param;
4781 enum pevent_func_arg_type type;
4782 va_list ap;
4783
4784 func_handle = find_func_handler(pevent, name);
4785 if (func_handle) {
4786 /*
4787 * This is most like caused by the users own
4788 * plugins updating the function. This overrides the
4789 * system defaults.
4790 */
4791 pr_stat("override of function helper '%s'", name);
4792 remove_func_handler(pevent, name);
4793 }
4794
4795 func_handle = malloc_or_die(sizeof(*func_handle));
4796 memset(func_handle, 0, sizeof(*func_handle));
4797
4798 func_handle->ret_type = ret_type;
4799 func_handle->name = strdup(name);
4800 func_handle->func = func;
4801 if (!func_handle->name)
4802 die("Failed to allocate function name");
4803
4804 next_param = &(func_handle->params);
4805 va_start(ap, name);
4806 for (;;) {
4807 type = va_arg(ap, enum pevent_func_arg_type);
4808 if (type == PEVENT_FUNC_ARG_VOID)
4809 break;
4810
4811 if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
4812 warning("Invalid argument type %d", type);
4813 goto out_free;
4814 }
4815
4816 param = malloc_or_die(sizeof(*param));
4817 param->type = type;
4818 param->next = NULL;
4819
4820 *next_param = param;
4821 next_param = &(param->next);
4822
4823 func_handle->nr_args++;
4824 }
4825 va_end(ap);
4826
4827 func_handle->next = pevent->func_handlers;
4828 pevent->func_handlers = func_handle;
4829
4830 return 0;
4831 out_free:
4832 va_end(ap);
4833 free_func_handle(func_handle);
4834 return -1;
4835 }
4836
4837 /**
4838 * pevent_register_event_handle - register a way to parse an event
4839 * @pevent: the handle to the pevent
4840 * @id: the id of the event to register
4841 * @sys_name: the system name the event belongs to
4842 * @event_name: the name of the event
4843 * @func: the function to call to parse the event information
4844 *
4845 * This function allows a developer to override the parsing of
4846 * a given event. If for some reason the default print format
4847 * is not sufficient, this function will register a function
4848 * for an event to be used to parse the data instead.
4849 *
4850 * If @id is >= 0, then it is used to find the event.
4851 * else @sys_name and @event_name are used.
4852 */
4853 int pevent_register_event_handler(struct pevent *pevent,
4854 int id, char *sys_name, char *event_name,
4855 pevent_event_handler_func func,
4856 void *context)
4857 {
4858 struct event_format *event;
4859 struct event_handler *handle;
4860
4861 if (id >= 0) {
4862 /* search by id */
4863 event = pevent_find_event(pevent, id);
4864 if (!event)
4865 goto not_found;
4866 if (event_name && (strcmp(event_name, event->name) != 0))
4867 goto not_found;
4868 if (sys_name && (strcmp(sys_name, event->system) != 0))
4869 goto not_found;
4870 } else {
4871 event = pevent_find_event_by_name(pevent, sys_name, event_name);
4872 if (!event)
4873 goto not_found;
4874 }
4875
4876 pr_stat("overriding event (%d) %s:%s with new print handler",
4877 event->id, event->system, event->name);
4878
4879 event->handler = func;
4880 event->context = context;
4881 return 0;
4882
4883 not_found:
4884 /* Save for later use. */
4885 handle = malloc_or_die(sizeof(*handle));
4886 memset(handle, 0, sizeof(handle));
4887 handle->id = id;
4888 if (event_name)
4889 handle->event_name = strdup(event_name);
4890 if (sys_name)
4891 handle->sys_name = strdup(sys_name);
4892
4893 handle->func = func;
4894 handle->next = pevent->handlers;
4895 pevent->handlers = handle;
4896 handle->context = context;
4897
4898 return -1;
4899 }
4900
4901 /**
4902 * pevent_alloc - create a pevent handle
4903 */
4904 struct pevent *pevent_alloc(void)
4905 {
4906 struct pevent *pevent;
4907
4908 pevent = malloc(sizeof(*pevent));
4909 if (!pevent)
4910 return NULL;
4911 memset(pevent, 0, sizeof(*pevent));
4912 pevent->ref_count = 1;
4913
4914 return pevent;
4915 }
4916
4917 void pevent_ref(struct pevent *pevent)
4918 {
4919 pevent->ref_count++;
4920 }
4921
4922 static void free_format_fields(struct format_field *field)
4923 {
4924 struct format_field *next;
4925
4926 while (field) {
4927 next = field->next;
4928 free(field->type);
4929 free(field->name);
4930 free(field);
4931 field = next;
4932 }
4933 }
4934
4935 static void free_formats(struct format *format)
4936 {
4937 free_format_fields(format->common_fields);
4938 free_format_fields(format->fields);
4939 }
4940
4941 static void free_event(struct event_format *event)
4942 {
4943 free(event->name);
4944 free(event->system);
4945
4946 free_formats(&event->format);
4947
4948 free(event->print_fmt.format);
4949 free_args(event->print_fmt.args);
4950
4951 free(event);
4952 }
4953
4954 /**
4955 * pevent_free - free a pevent handle
4956 * @pevent: the pevent handle to free
4957 */
4958 void pevent_free(struct pevent *pevent)
4959 {
4960 struct cmdline_list *cmdlist = pevent->cmdlist, *cmdnext;
4961 struct func_list *funclist = pevent->funclist, *funcnext;
4962 struct printk_list *printklist = pevent->printklist, *printknext;
4963 struct pevent_function_handler *func_handler;
4964 struct event_handler *handle;
4965 int i;
4966
4967 pevent->ref_count--;
4968 if (pevent->ref_count)
4969 return;
4970
4971 if (pevent->cmdlines) {
4972 for (i = 0; i < pevent->cmdline_count; i++)
4973 free(pevent->cmdlines[i].comm);
4974 free(pevent->cmdlines);
4975 }
4976
4977 while (cmdlist) {
4978 cmdnext = cmdlist->next;
4979 free(cmdlist->comm);
4980 free(cmdlist);
4981 cmdlist = cmdnext;
4982 }
4983
4984 if (pevent->func_map) {
4985 for (i = 0; i < pevent->func_count; i++) {
4986 free(pevent->func_map[i].func);
4987 free(pevent->func_map[i].mod);
4988 }
4989 free(pevent->func_map);
4990 }
4991
4992 while (funclist) {
4993 funcnext = funclist->next;
4994 free(funclist->func);
4995 free(funclist->mod);
4996 free(funclist);
4997 funclist = funcnext;
4998 }
4999
5000 while (pevent->func_handlers) {
5001 func_handler = pevent->func_handlers;
5002 pevent->func_handlers = func_handler->next;
5003 free_func_handle(func_handler);
5004 }
5005
5006 if (pevent->printk_map) {
5007 for (i = 0; i < pevent->printk_count; i++)
5008 free(pevent->printk_map[i].printk);
5009 free(pevent->printk_map);
5010 }
5011
5012 while (printklist) {
5013 printknext = printklist->next;
5014 free(printklist->printk);
5015 free(printklist);
5016 printklist = printknext;
5017 }
5018
5019 for (i = 0; i < pevent->nr_events; i++)
5020 free_event(pevent->events[i]);
5021
5022 while (pevent->handlers) {
5023 handle = pevent->handlers;
5024 pevent->handlers = handle->next;
5025 free_handler(handle);
5026 }
5027
5028 free(pevent->events);
5029 free(pevent->sort_events);
5030
5031 free(pevent);
5032 }
5033
5034 void pevent_unref(struct pevent *pevent)
5035 {
5036 pevent_free(pevent);
5037 }
Linux kernel - Deliverables
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