projects / deliverable / linux.git / blob
? search:


ec1317483010341097a14156558006e4fd330d33
[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 do_warning("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 do_warning("unknown op '%s'", op);
1617 return -1;
1618 }
1619 }
1620 }
1621
1622 static int 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 else
1629 arg->op.prio = get_op_prio(arg->op.op);
1630
1631 return arg->op.prio;
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 if (set_op_prio(arg) == -1) {
1714 event->flags |= EVENT_FL_FAILED;
1715 goto out_free;
1716 }
1717
1718 type = read_token_item(&token);
1719 *tok = token;
1720
1721 /* could just be a type pointer */
1722 if ((strcmp(arg->op.op, "*") == 0) &&
1723 type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1724 if (left->type != PRINT_ATOM)
1725 die("bad pointer type");
1726 left->atom.atom = realloc(left->atom.atom,
1727 strlen(left->atom.atom) + 3);
1728 strcat(left->atom.atom, " *");
1729 free(arg->op.op);
1730 *arg = *left;
1731 free(left);
1732
1733 return type;
1734 }
1735
1736 right = alloc_arg();
1737 type = process_arg_token(event, right, tok, type);
1738 arg->op.right = right;
1739
1740 } else if (strcmp(token, "[") == 0) {
1741
1742 left = alloc_arg();
1743 *left = *arg;
1744
1745 arg->type = PRINT_OP;
1746 arg->op.op = token;
1747 arg->op.left = left;
1748
1749 arg->op.prio = 0;
1750
1751 type = process_array(event, arg, tok);
1752
1753 } else {
1754 do_warning("unknown op '%s'", token);
1755 event->flags |= EVENT_FL_FAILED;
1756 /* the arg is now the left side */
1757 goto out_free;
1758 }
1759
1760 if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
1761 int prio;
1762
1763 /* higher prios need to be closer to the root */
1764 prio = get_op_prio(*tok);
1765
1766 if (prio > arg->op.prio)
1767 return process_op(event, arg, tok);
1768
1769 return process_op(event, right, tok);
1770 }
1771
1772 return type;
1773
1774 out_free:
1775 free_token(token);
1776 *tok = NULL;
1777 return EVENT_ERROR;
1778 }
1779
1780 static enum event_type
1781 process_entry(struct event_format *event __unused, struct print_arg *arg,
1782 char **tok)
1783 {
1784 enum event_type type;
1785 char *field;
1786 char *token;
1787
1788 if (read_expected(EVENT_OP, "->") < 0)
1789 goto out_err;
1790
1791 if (read_expect_type(EVENT_ITEM, &token) < 0)
1792 goto out_free;
1793 field = token;
1794
1795 arg->type = PRINT_FIELD;
1796 arg->field.name = field;
1797
1798 if (is_flag_field) {
1799 arg->field.field = pevent_find_any_field(event, arg->field.name);
1800 arg->field.field->flags |= FIELD_IS_FLAG;
1801 is_flag_field = 0;
1802 } else if (is_symbolic_field) {
1803 arg->field.field = pevent_find_any_field(event, arg->field.name);
1804 arg->field.field->flags |= FIELD_IS_SYMBOLIC;
1805 is_symbolic_field = 0;
1806 }
1807
1808 type = read_token(&token);
1809 *tok = token;
1810
1811 return type;
1812
1813 out_free:
1814 free_token(token);
1815 out_err:
1816 *tok = NULL;
1817 return EVENT_ERROR;
1818 }
1819
1820 static char *arg_eval (struct print_arg *arg);
1821
1822 static unsigned long long
1823 eval_type_str(unsigned long long val, const char *type, int pointer)
1824 {
1825 int sign = 0;
1826 char *ref;
1827 int len;
1828
1829 len = strlen(type);
1830
1831 if (pointer) {
1832
1833 if (type[len-1] != '*') {
1834 do_warning("pointer expected with non pointer type");
1835 return val;
1836 }
1837
1838 ref = malloc_or_die(len);
1839 memcpy(ref, type, len);
1840
1841 /* chop off the " *" */
1842 ref[len - 2] = 0;
1843
1844 val = eval_type_str(val, ref, 0);
1845 free(ref);
1846 return val;
1847 }
1848
1849 /* check if this is a pointer */
1850 if (type[len - 1] == '*')
1851 return val;
1852
1853 /* Try to figure out the arg size*/
1854 if (strncmp(type, "struct", 6) == 0)
1855 /* all bets off */
1856 return val;
1857
1858 if (strcmp(type, "u8") == 0)
1859 return val & 0xff;
1860
1861 if (strcmp(type, "u16") == 0)
1862 return val & 0xffff;
1863
1864 if (strcmp(type, "u32") == 0)
1865 return val & 0xffffffff;
1866
1867 if (strcmp(type, "u64") == 0 ||
1868 strcmp(type, "s64"))
1869 return val;
1870
1871 if (strcmp(type, "s8") == 0)
1872 return (unsigned long long)(char)val & 0xff;
1873
1874 if (strcmp(type, "s16") == 0)
1875 return (unsigned long long)(short)val & 0xffff;
1876
1877 if (strcmp(type, "s32") == 0)
1878 return (unsigned long long)(int)val & 0xffffffff;
1879
1880 if (strncmp(type, "unsigned ", 9) == 0) {
1881 sign = 0;
1882 type += 9;
1883 }
1884
1885 if (strcmp(type, "char") == 0) {
1886 if (sign)
1887 return (unsigned long long)(char)val & 0xff;
1888 else
1889 return val & 0xff;
1890 }
1891
1892 if (strcmp(type, "short") == 0) {
1893 if (sign)
1894 return (unsigned long long)(short)val & 0xffff;
1895 else
1896 return val & 0xffff;
1897 }
1898
1899 if (strcmp(type, "int") == 0) {
1900 if (sign)
1901 return (unsigned long long)(int)val & 0xffffffff;
1902 else
1903 return val & 0xffffffff;
1904 }
1905
1906 return val;
1907 }
1908
1909 /*
1910 * Try to figure out the type.
1911 */
1912 static unsigned long long
1913 eval_type(unsigned long long val, struct print_arg *arg, int pointer)
1914 {
1915 if (arg->type != PRINT_TYPE)
1916 die("expected type argument");
1917
1918 return eval_type_str(val, arg->typecast.type, pointer);
1919 }
1920
1921 static int arg_num_eval(struct print_arg *arg, long long *val)
1922 {
1923 long long left, right;
1924 int ret = 1;
1925
1926 switch (arg->type) {
1927 case PRINT_ATOM:
1928 *val = strtoll(arg->atom.atom, NULL, 0);
1929 break;
1930 case PRINT_TYPE:
1931 ret = arg_num_eval(arg->typecast.item, val);
1932 if (!ret)
1933 break;
1934 *val = eval_type(*val, arg, 0);
1935 break;
1936 case PRINT_OP:
1937 switch (arg->op.op[0]) {
1938 case '|':
1939 ret = arg_num_eval(arg->op.left, &left);
1940 if (!ret)
1941 break;
1942 ret = arg_num_eval(arg->op.right, &right);
1943 if (!ret)
1944 break;
1945 if (arg->op.op[1])
1946 *val = left || right;
1947 else
1948 *val = left | right;
1949 break;
1950 case '&':
1951 ret = arg_num_eval(arg->op.left, &left);
1952 if (!ret)
1953 break;
1954 ret = arg_num_eval(arg->op.right, &right);
1955 if (!ret)
1956 break;
1957 if (arg->op.op[1])
1958 *val = left && right;
1959 else
1960 *val = left & right;
1961 break;
1962 case '<':
1963 ret = arg_num_eval(arg->op.left, &left);
1964 if (!ret)
1965 break;
1966 ret = arg_num_eval(arg->op.right, &right);
1967 if (!ret)
1968 break;
1969 switch (arg->op.op[1]) {
1970 case 0:
1971 *val = left < right;
1972 break;
1973 case '<':
1974 *val = left << right;
1975 break;
1976 case '=':
1977 *val = left <= right;
1978 break;
1979 default:
1980 do_warning("unknown op '%s'", arg->op.op);
1981 ret = 0;
1982 }
1983 break;
1984 case '>':
1985 ret = arg_num_eval(arg->op.left, &left);
1986 if (!ret)
1987 break;
1988 ret = arg_num_eval(arg->op.right, &right);
1989 if (!ret)
1990 break;
1991 switch (arg->op.op[1]) {
1992 case 0:
1993 *val = left > right;
1994 break;
1995 case '>':
1996 *val = left >> right;
1997 break;
1998 case '=':
1999 *val = left >= right;
2000 break;
2001 default:
2002 do_warning("unknown op '%s'", arg->op.op);
2003 ret = 0;
2004 }
2005 break;
2006 case '=':
2007 ret = arg_num_eval(arg->op.left, &left);
2008 if (!ret)
2009 break;
2010 ret = arg_num_eval(arg->op.right, &right);
2011 if (!ret)
2012 break;
2013
2014 if (arg->op.op[1] != '=') {
2015 do_warning("unknown op '%s'", arg->op.op);
2016 ret = 0;
2017 } else
2018 *val = left == right;
2019 break;
2020 case '!':
2021 ret = arg_num_eval(arg->op.left, &left);
2022 if (!ret)
2023 break;
2024 ret = arg_num_eval(arg->op.right, &right);
2025 if (!ret)
2026 break;
2027
2028 switch (arg->op.op[1]) {
2029 case '=':
2030 *val = left != right;
2031 break;
2032 default:
2033 do_warning("unknown op '%s'", arg->op.op);
2034 ret = 0;
2035 }
2036 break;
2037 case '-':
2038 /* check for negative */
2039 if (arg->op.left->type == PRINT_NULL)
2040 left = 0;
2041 else
2042 ret = arg_num_eval(arg->op.left, &left);
2043 if (!ret)
2044 break;
2045 ret = arg_num_eval(arg->op.right, &right);
2046 if (!ret)
2047 break;
2048 *val = left - right;
2049 break;
2050 case '+':
2051 if (arg->op.left->type == PRINT_NULL)
2052 left = 0;
2053 else
2054 ret = arg_num_eval(arg->op.left, &left);
2055 if (!ret)
2056 break;
2057 ret = arg_num_eval(arg->op.right, &right);
2058 if (!ret)
2059 break;
2060 *val = left + right;
2061 break;
2062 default:
2063 do_warning("unknown op '%s'", arg->op.op);
2064 ret = 0;
2065 }
2066 break;
2067
2068 case PRINT_NULL:
2069 case PRINT_FIELD ... PRINT_SYMBOL:
2070 case PRINT_STRING:
2071 case PRINT_BSTRING:
2072 default:
2073 do_warning("invalid eval type %d", arg->type);
2074 ret = 0;
2075
2076 }
2077 return ret;
2078 }
2079
2080 static char *arg_eval (struct print_arg *arg)
2081 {
2082 long long val;
2083 static char buf[20];
2084
2085 switch (arg->type) {
2086 case PRINT_ATOM:
2087 return arg->atom.atom;
2088 case PRINT_TYPE:
2089 return arg_eval(arg->typecast.item);
2090 case PRINT_OP:
2091 if (!arg_num_eval(arg, &val))
2092 break;
2093 sprintf(buf, "%lld", val);
2094 return buf;
2095
2096 case PRINT_NULL:
2097 case PRINT_FIELD ... PRINT_SYMBOL:
2098 case PRINT_STRING:
2099 case PRINT_BSTRING:
2100 default:
2101 die("invalid eval type %d", arg->type);
2102 break;
2103 }
2104
2105 return NULL;
2106 }
2107
2108 static enum event_type
2109 process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2110 {
2111 enum event_type type;
2112 struct print_arg *arg = NULL;
2113 struct print_flag_sym *field;
2114 char *token = *tok;
2115 char *value;
2116
2117 do {
2118 free_token(token);
2119 type = read_token_item(&token);
2120 if (test_type_token(type, token, EVENT_OP, "{"))
2121 break;
2122
2123 arg = alloc_arg();
2124
2125 free_token(token);
2126 type = process_arg(event, arg, &token);
2127 if (test_type_token(type, token, EVENT_DELIM, ","))
2128 goto out_free;
2129
2130 field = malloc_or_die(sizeof(*field));
2131 memset(field, 0, sizeof(*field));
2132
2133 value = arg_eval(arg);
2134 if (value == NULL)
2135 goto out_free;
2136 field->value = strdup(value);
2137
2138 free_arg(arg);
2139 arg = alloc_arg();
2140
2141 free_token(token);
2142 type = process_arg(event, arg, &token);
2143 if (test_type_token(type, token, EVENT_OP, "}"))
2144 goto out_free;
2145
2146 value = arg_eval(arg);
2147 if (value == NULL)
2148 goto out_free;
2149 field->str = strdup(value);
2150 free_arg(arg);
2151 arg = NULL;
2152
2153 *list = field;
2154 list = &field->next;
2155
2156 free_token(token);
2157 type = read_token_item(&token);
2158 } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2159
2160 *tok = token;
2161 return type;
2162
2163 out_free:
2164 free_arg(arg);
2165 free_token(token);
2166 *tok = NULL;
2167
2168 return EVENT_ERROR;
2169 }
2170
2171 static enum event_type
2172 process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2173 {
2174 struct print_arg *field;
2175 enum event_type type;
2176 char *token;
2177
2178 memset(arg, 0, sizeof(*arg));
2179 arg->type = PRINT_FLAGS;
2180
2181 field = alloc_arg();
2182
2183 type = process_arg(event, field, &token);
2184
2185 /* Handle operations in the first argument */
2186 while (type == EVENT_OP)
2187 type = process_op(event, field, &token);
2188
2189 if (test_type_token(type, token, EVENT_DELIM, ","))
2190 goto out_free;
2191 free_token(token);
2192
2193 arg->flags.field = field;
2194
2195 type = read_token_item(&token);
2196 if (event_item_type(type)) {
2197 arg->flags.delim = token;
2198 type = read_token_item(&token);
2199 }
2200
2201 if (test_type_token(type, token, EVENT_DELIM, ","))
2202 goto out_free;
2203
2204 type = process_fields(event, &arg->flags.flags, &token);
2205 if (test_type_token(type, token, EVENT_DELIM, ")"))
2206 goto out_free;
2207
2208 free_token(token);
2209 type = read_token_item(tok);
2210 return type;
2211
2212 out_free:
2213 free_token(token);
2214 *tok = NULL;
2215 return EVENT_ERROR;
2216 }
2217
2218 static enum event_type
2219 process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2220 {
2221 struct print_arg *field;
2222 enum event_type type;
2223 char *token;
2224
2225 memset(arg, 0, sizeof(*arg));
2226 arg->type = PRINT_SYMBOL;
2227
2228 field = alloc_arg();
2229
2230 type = process_arg(event, field, &token);
2231 if (test_type_token(type, token, EVENT_DELIM, ","))
2232 goto out_free;
2233
2234 arg->symbol.field = field;
2235
2236 type = process_fields(event, &arg->symbol.symbols, &token);
2237 if (test_type_token(type, token, EVENT_DELIM, ")"))
2238 goto out_free;
2239
2240 free_token(token);
2241 type = read_token_item(tok);
2242 return type;
2243
2244 out_free:
2245 free_token(token);
2246 *tok = NULL;
2247 return EVENT_ERROR;
2248 }
2249
2250 static enum event_type
2251 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2252 {
2253 struct format_field *field;
2254 enum event_type type;
2255 char *token;
2256
2257 memset(arg, 0, sizeof(*arg));
2258 arg->type = PRINT_DYNAMIC_ARRAY;
2259
2260 /*
2261 * The item within the parenthesis is another field that holds
2262 * the index into where the array starts.
2263 */
2264 type = read_token(&token);
2265 *tok = token;
2266 if (type != EVENT_ITEM)
2267 goto out_free;
2268
2269 /* Find the field */
2270
2271 field = pevent_find_field(event, token);
2272 if (!field)
2273 goto out_free;
2274
2275 arg->dynarray.field = field;
2276 arg->dynarray.index = 0;
2277
2278 if (read_expected(EVENT_DELIM, ")") < 0)
2279 goto out_free;
2280
2281 free_token(token);
2282 type = read_token_item(&token);
2283 *tok = token;
2284 if (type != EVENT_OP || strcmp(token, "[") != 0)
2285 return type;
2286
2287 free_token(token);
2288 arg = alloc_arg();
2289 type = process_arg(event, arg, &token);
2290 if (type == EVENT_ERROR)
2291 goto out_free;
2292
2293 if (!test_type_token(type, token, EVENT_OP, "]"))
2294 goto out_free;
2295
2296 free_token(token);
2297 type = read_token_item(tok);
2298 return type;
2299
2300 out_free:
2301 free(arg);
2302 free_token(token);
2303 *tok = NULL;
2304 return EVENT_ERROR;
2305 }
2306
2307 static enum event_type
2308 process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2309 {
2310 struct print_arg *item_arg;
2311 enum event_type type;
2312 char *token;
2313
2314 type = process_arg(event, arg, &token);
2315
2316 if (type == EVENT_ERROR)
2317 goto out_free;
2318
2319 if (type == EVENT_OP)
2320 type = process_op(event, arg, &token);
2321
2322 if (type == EVENT_ERROR)
2323 goto out_free;
2324
2325 if (test_type_token(type, token, EVENT_DELIM, ")"))
2326 goto out_free;
2327
2328 free_token(token);
2329 type = read_token_item(&token);
2330
2331 /*
2332 * If the next token is an item or another open paren, then
2333 * this was a typecast.
2334 */
2335 if (event_item_type(type) ||
2336 (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2337
2338 /* make this a typecast and contine */
2339
2340 /* prevous must be an atom */
2341 if (arg->type != PRINT_ATOM)
2342 die("previous needed to be PRINT_ATOM");
2343
2344 item_arg = alloc_arg();
2345
2346 arg->type = PRINT_TYPE;
2347 arg->typecast.type = arg->atom.atom;
2348 arg->typecast.item = item_arg;
2349 type = process_arg_token(event, item_arg, &token, type);
2350
2351 }
2352
2353 *tok = token;
2354 return type;
2355
2356 out_free:
2357 free_token(token);
2358 *tok = NULL;
2359 return EVENT_ERROR;
2360 }
2361
2362
2363 static enum event_type
2364 process_str(struct event_format *event __unused, struct print_arg *arg, char **tok)
2365 {
2366 enum event_type type;
2367 char *token;
2368
2369 if (read_expect_type(EVENT_ITEM, &token) < 0)
2370 goto out_free;
2371
2372 arg->type = PRINT_STRING;
2373 arg->string.string = token;
2374 arg->string.offset = -1;
2375
2376 if (read_expected(EVENT_DELIM, ")") < 0)
2377 goto out_err;
2378
2379 type = read_token(&token);
2380 *tok = token;
2381
2382 return type;
2383
2384 out_free:
2385 free_token(token);
2386 out_err:
2387 *tok = NULL;
2388 return EVENT_ERROR;
2389 }
2390
2391 static struct pevent_function_handler *
2392 find_func_handler(struct pevent *pevent, char *func_name)
2393 {
2394 struct pevent_function_handler *func;
2395
2396 for (func = pevent->func_handlers; func; func = func->next) {
2397 if (strcmp(func->name, func_name) == 0)
2398 break;
2399 }
2400
2401 return func;
2402 }
2403
2404 static void remove_func_handler(struct pevent *pevent, char *func_name)
2405 {
2406 struct pevent_function_handler *func;
2407 struct pevent_function_handler **next;
2408
2409 next = &pevent->func_handlers;
2410 while ((func = *next)) {
2411 if (strcmp(func->name, func_name) == 0) {
2412 *next = func->next;
2413 free_func_handle(func);
2414 break;
2415 }
2416 next = &func->next;
2417 }
2418 }
2419
2420 static enum event_type
2421 process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2422 struct print_arg *arg, char **tok)
2423 {
2424 struct print_arg **next_arg;
2425 struct print_arg *farg;
2426 enum event_type type;
2427 char *token;
2428 char *test;
2429 int i;
2430
2431 arg->type = PRINT_FUNC;
2432 arg->func.func = func;
2433
2434 *tok = NULL;
2435
2436 next_arg = &(arg->func.args);
2437 for (i = 0; i < func->nr_args; i++) {
2438 farg = alloc_arg();
2439 type = process_arg(event, farg, &token);
2440 if (i < (func->nr_args - 1))
2441 test = ",";
2442 else
2443 test = ")";
2444
2445 if (test_type_token(type, token, EVENT_DELIM, test)) {
2446 free_arg(farg);
2447 free_token(token);
2448 return EVENT_ERROR;
2449 }
2450
2451 *next_arg = farg;
2452 next_arg = &(farg->next);
2453 free_token(token);
2454 }
2455
2456 type = read_token(&token);
2457 *tok = token;
2458
2459 return type;
2460 }
2461
2462 static enum event_type
2463 process_function(struct event_format *event, struct print_arg *arg,
2464 char *token, char **tok)
2465 {
2466 struct pevent_function_handler *func;
2467
2468 if (strcmp(token, "__print_flags") == 0) {
2469 free_token(token);
2470 is_flag_field = 1;
2471 return process_flags(event, arg, tok);
2472 }
2473 if (strcmp(token, "__print_symbolic") == 0) {
2474 free_token(token);
2475 is_symbolic_field = 1;
2476 return process_symbols(event, arg, tok);
2477 }
2478 if (strcmp(token, "__get_str") == 0) {
2479 free_token(token);
2480 return process_str(event, arg, tok);
2481 }
2482 if (strcmp(token, "__get_dynamic_array") == 0) {
2483 free_token(token);
2484 return process_dynamic_array(event, arg, tok);
2485 }
2486
2487 func = find_func_handler(event->pevent, token);
2488 if (func) {
2489 free_token(token);
2490 return process_func_handler(event, func, arg, tok);
2491 }
2492
2493 do_warning("function %s not defined", token);
2494 free_token(token);
2495 return EVENT_ERROR;
2496 }
2497
2498 static enum event_type
2499 process_arg_token(struct event_format *event, struct print_arg *arg,
2500 char **tok, enum event_type type)
2501 {
2502 char *token;
2503 char *atom;
2504
2505 token = *tok;
2506
2507 switch (type) {
2508 case EVENT_ITEM:
2509 if (strcmp(token, "REC") == 0) {
2510 free_token(token);
2511 type = process_entry(event, arg, &token);
2512 break;
2513 }
2514 atom = token;
2515 /* test the next token */
2516 type = read_token_item(&token);
2517
2518 /*
2519 * If the next token is a parenthesis, then this
2520 * is a function.
2521 */
2522 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
2523 free_token(token);
2524 token = NULL;
2525 /* this will free atom. */
2526 type = process_function(event, arg, atom, &token);
2527 break;
2528 }
2529 /* atoms can be more than one token long */
2530 while (type == EVENT_ITEM) {
2531 atom = realloc(atom, strlen(atom) + strlen(token) + 2);
2532 strcat(atom, " ");
2533 strcat(atom, token);
2534 free_token(token);
2535 type = read_token_item(&token);
2536 }
2537
2538 arg->type = PRINT_ATOM;
2539 arg->atom.atom = atom;
2540 break;
2541
2542 case EVENT_DQUOTE:
2543 case EVENT_SQUOTE:
2544 arg->type = PRINT_ATOM;
2545 arg->atom.atom = token;
2546 type = read_token_item(&token);
2547 break;
2548 case EVENT_DELIM:
2549 if (strcmp(token, "(") == 0) {
2550 free_token(token);
2551 type = process_paren(event, arg, &token);
2552 break;
2553 }
2554 case EVENT_OP:
2555 /* handle single ops */
2556 arg->type = PRINT_OP;
2557 arg->op.op = token;
2558 arg->op.left = NULL;
2559 type = process_op(event, arg, &token);
2560
2561 /* On error, the op is freed */
2562 if (type == EVENT_ERROR)
2563 arg->op.op = NULL;
2564
2565 /* return error type if errored */
2566 break;
2567
2568 case EVENT_ERROR ... EVENT_NEWLINE:
2569 default:
2570 die("unexpected type %d", type);
2571 }
2572 *tok = token;
2573
2574 return type;
2575 }
2576
2577 static int event_read_print_args(struct event_format *event, struct print_arg **list)
2578 {
2579 enum event_type type = EVENT_ERROR;
2580 struct print_arg *arg;
2581 char *token;
2582 int args = 0;
2583
2584 do {
2585 if (type == EVENT_NEWLINE) {
2586 type = read_token_item(&token);
2587 continue;
2588 }
2589
2590 arg = alloc_arg();
2591
2592 type = process_arg(event, arg, &token);
2593
2594 if (type == EVENT_ERROR) {
2595 free_token(token);
2596 free_arg(arg);
2597 return -1;
2598 }
2599
2600 *list = arg;
2601 args++;
2602
2603 if (type == EVENT_OP) {
2604 type = process_op(event, arg, &token);
2605 free_token(token);
2606 if (type == EVENT_ERROR) {
2607 *list = NULL;
2608 free_arg(arg);
2609 return -1;
2610 }
2611 list = &arg->next;
2612 continue;
2613 }
2614
2615 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
2616 free_token(token);
2617 *list = arg;
2618 list = &arg->next;
2619 continue;
2620 }
2621 break;
2622 } while (type != EVENT_NONE);
2623
2624 if (type != EVENT_NONE && type != EVENT_ERROR)
2625 free_token(token);
2626
2627 return args;
2628 }
2629
2630 static int event_read_print(struct event_format *event)
2631 {
2632 enum event_type type;
2633 char *token;
2634 int ret;
2635
2636 if (read_expected_item(EVENT_ITEM, "print") < 0)
2637 return -1;
2638
2639 if (read_expected(EVENT_ITEM, "fmt") < 0)
2640 return -1;
2641
2642 if (read_expected(EVENT_OP, ":") < 0)
2643 return -1;
2644
2645 if (read_expect_type(EVENT_DQUOTE, &token) < 0)
2646 goto fail;
2647
2648 concat:
2649 event->print_fmt.format = token;
2650 event->print_fmt.args = NULL;
2651
2652 /* ok to have no arg */
2653 type = read_token_item(&token);
2654
2655 if (type == EVENT_NONE)
2656 return 0;
2657
2658 /* Handle concatenation of print lines */
2659 if (type == EVENT_DQUOTE) {
2660 char *cat;
2661
2662 cat = malloc_or_die(strlen(event->print_fmt.format) +
2663 strlen(token) + 1);
2664 strcpy(cat, event->print_fmt.format);
2665 strcat(cat, token);
2666 free_token(token);
2667 free_token(event->print_fmt.format);
2668 event->print_fmt.format = NULL;
2669 token = cat;
2670 goto concat;
2671 }
2672
2673 if (test_type_token(type, token, EVENT_DELIM, ","))
2674 goto fail;
2675
2676 free_token(token);
2677
2678 ret = event_read_print_args(event, &event->print_fmt.args);
2679 if (ret < 0)
2680 return -1;
2681
2682 return ret;
2683
2684 fail:
2685 free_token(token);
2686 return -1;
2687 }
2688
2689 /**
2690 * pevent_find_common_field - return a common field by event
2691 * @event: handle for the event
2692 * @name: the name of the common field to return
2693 *
2694 * Returns a common field from the event by the given @name.
2695 * This only searchs the common fields and not all field.
2696 */
2697 struct format_field *
2698 pevent_find_common_field(struct event_format *event, const char *name)
2699 {
2700 struct format_field *format;
2701
2702 for (format = event->format.common_fields;
2703 format; format = format->next) {
2704 if (strcmp(format->name, name) == 0)
2705 break;
2706 }
2707
2708 return format;
2709 }
2710
2711 /**
2712 * pevent_find_field - find a non-common field
2713 * @event: handle for the event
2714 * @name: the name of the non-common field
2715 *
2716 * Returns a non-common field by the given @name.
2717 * This does not search common fields.
2718 */
2719 struct format_field *
2720 pevent_find_field(struct event_format *event, const char *name)
2721 {
2722 struct format_field *format;
2723
2724 for (format = event->format.fields;
2725 format; format = format->next) {
2726 if (strcmp(format->name, name) == 0)
2727 break;
2728 }
2729
2730 return format;
2731 }
2732
2733 /**
2734 * pevent_find_any_field - find any field by name
2735 * @event: handle for the event
2736 * @name: the name of the field
2737 *
2738 * Returns a field by the given @name.
2739 * This searchs the common field names first, then
2740 * the non-common ones if a common one was not found.
2741 */
2742 struct format_field *
2743 pevent_find_any_field(struct event_format *event, const char *name)
2744 {
2745 struct format_field *format;
2746
2747 format = pevent_find_common_field(event, name);
2748 if (format)
2749 return format;
2750 return pevent_find_field(event, name);
2751 }
2752
2753 /**
2754 * pevent_read_number - read a number from data
2755 * @pevent: handle for the pevent
2756 * @ptr: the raw data
2757 * @size: the size of the data that holds the number
2758 *
2759 * Returns the number (converted to host) from the
2760 * raw data.
2761 */
2762 unsigned long long pevent_read_number(struct pevent *pevent,
2763 const void *ptr, int size)
2764 {
2765 switch (size) {
2766 case 1:
2767 return *(unsigned char *)ptr;
2768 case 2:
2769 return data2host2(pevent, ptr);
2770 case 4:
2771 return data2host4(pevent, ptr);
2772 case 8:
2773 return data2host8(pevent, ptr);
2774 default:
2775 /* BUG! */
2776 return 0;
2777 }
2778 }
2779
2780 /**
2781 * pevent_read_number_field - read a number from data
2782 * @field: a handle to the field
2783 * @data: the raw data to read
2784 * @value: the value to place the number in
2785 *
2786 * Reads raw data according to a field offset and size,
2787 * and translates it into @value.
2788 *
2789 * Returns 0 on success, -1 otherwise.
2790 */
2791 int pevent_read_number_field(struct format_field *field, const void *data,
2792 unsigned long long *value)
2793 {
2794 if (!field)
2795 return -1;
2796 switch (field->size) {
2797 case 1:
2798 case 2:
2799 case 4:
2800 case 8:
2801 *value = pevent_read_number(field->event->pevent,
2802 data + field->offset, field->size);
2803 return 0;
2804 default:
2805 return -1;
2806 }
2807 }
2808
2809 static int get_common_info(struct pevent *pevent,
2810 const char *type, int *offset, int *size)
2811 {
2812 struct event_format *event;
2813 struct format_field *field;
2814
2815 /*
2816 * All events should have the same common elements.
2817 * Pick any event to find where the type is;
2818 */
2819 if (!pevent->events)
2820 die("no event_list!");
2821
2822 event = pevent->events[0];
2823 field = pevent_find_common_field(event, type);
2824 if (!field)
2825 die("field '%s' not found", type);
2826
2827 *offset = field->offset;
2828 *size = field->size;
2829
2830 return 0;
2831 }
2832
2833 static int __parse_common(struct pevent *pevent, void *data,
2834 int *size, int *offset, const char *name)
2835 {
2836 int ret;
2837
2838 if (!*size) {
2839 ret = get_common_info(pevent, name, offset, size);
2840 if (ret < 0)
2841 return ret;
2842 }
2843 return pevent_read_number(pevent, data + *offset, *size);
2844 }
2845
2846 static int trace_parse_common_type(struct pevent *pevent, void *data)
2847 {
2848 return __parse_common(pevent, data,
2849 &pevent->type_size, &pevent->type_offset,
2850 "common_type");
2851 }
2852
2853 static int parse_common_pid(struct pevent *pevent, void *data)
2854 {
2855 return __parse_common(pevent, data,
2856 &pevent->pid_size, &pevent->pid_offset,
2857 "common_pid");
2858 }
2859
2860 static int parse_common_pc(struct pevent *pevent, void *data)
2861 {
2862 return __parse_common(pevent, data,
2863 &pevent->pc_size, &pevent->pc_offset,
2864 "common_preempt_count");
2865 }
2866
2867 static int parse_common_flags(struct pevent *pevent, void *data)
2868 {
2869 return __parse_common(pevent, data,
2870 &pevent->flags_size, &pevent->flags_offset,
2871 "common_flags");
2872 }
2873
2874 static int parse_common_lock_depth(struct pevent *pevent, void *data)
2875 {
2876 int ret;
2877
2878 ret = __parse_common(pevent, data,
2879 &pevent->ld_size, &pevent->ld_offset,
2880 "common_lock_depth");
2881 if (ret < 0)
2882 return -1;
2883
2884 return ret;
2885 }
2886
2887 static int events_id_cmp(const void *a, const void *b);
2888
2889 /**
2890 * pevent_find_event - find an event by given id
2891 * @pevent: a handle to the pevent
2892 * @id: the id of the event
2893 *
2894 * Returns an event that has a given @id.
2895 */
2896 struct event_format *pevent_find_event(struct pevent *pevent, int id)
2897 {
2898 struct event_format **eventptr;
2899 struct event_format key;
2900 struct event_format *pkey = &key;
2901
2902 /* Check cache first */
2903 if (pevent->last_event && pevent->last_event->id == id)
2904 return pevent->last_event;
2905
2906 key.id = id;
2907
2908 eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
2909 sizeof(*pevent->events), events_id_cmp);
2910
2911 if (eventptr) {
2912 pevent->last_event = *eventptr;
2913 return *eventptr;
2914 }
2915
2916 return NULL;
2917 }
2918
2919 /**
2920 * pevent_find_event_by_name - find an event by given name
2921 * @pevent: a handle to the pevent
2922 * @sys: the system name to search for
2923 * @name: the name of the event to search for
2924 *
2925 * This returns an event with a given @name and under the system
2926 * @sys. If @sys is NULL the first event with @name is returned.
2927 */
2928 struct event_format *
2929 pevent_find_event_by_name(struct pevent *pevent,
2930 const char *sys, const char *name)
2931 {
2932 struct event_format *event;
2933 int i;
2934
2935 if (pevent->last_event &&
2936 strcmp(pevent->last_event->name, name) == 0 &&
2937 (!sys || strcmp(pevent->last_event->system, sys) == 0))
2938 return pevent->last_event;
2939
2940 for (i = 0; i < pevent->nr_events; i++) {
2941 event = pevent->events[i];
2942 if (strcmp(event->name, name) == 0) {
2943 if (!sys)
2944 break;
2945 if (strcmp(event->system, sys) == 0)
2946 break;
2947 }
2948 }
2949 if (i == pevent->nr_events)
2950 event = NULL;
2951
2952 pevent->last_event = event;
2953 return event;
2954 }
2955
2956 static unsigned long long
2957 eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
2958 {
2959 struct pevent *pevent = event->pevent;
2960 unsigned long long val = 0;
2961 unsigned long long left, right;
2962 struct print_arg *typearg = NULL;
2963 struct print_arg *larg;
2964 unsigned long offset;
2965 unsigned int field_size;
2966
2967 switch (arg->type) {
2968 case PRINT_NULL:
2969 /* ?? */
2970 return 0;
2971 case PRINT_ATOM:
2972 return strtoull(arg->atom.atom, NULL, 0);
2973 case PRINT_FIELD:
2974 if (!arg->field.field) {
2975 arg->field.field = pevent_find_any_field(event, arg->field.name);
2976 if (!arg->field.field)
2977 die("field %s not found", arg->field.name);
2978 }
2979 /* must be a number */
2980 val = pevent_read_number(pevent, data + arg->field.field->offset,
2981 arg->field.field->size);
2982 break;
2983 case PRINT_FLAGS:
2984 case PRINT_SYMBOL:
2985 break;
2986 case PRINT_TYPE:
2987 val = eval_num_arg(data, size, event, arg->typecast.item);
2988 return eval_type(val, arg, 0);
2989 case PRINT_STRING:
2990 case PRINT_BSTRING:
2991 return 0;
2992 case PRINT_FUNC: {
2993 struct trace_seq s;
2994 trace_seq_init(&s);
2995 val = process_defined_func(&s, data, size, event, arg);
2996 trace_seq_destroy(&s);
2997 return val;
2998 }
2999 case PRINT_OP:
3000 if (strcmp(arg->op.op, "[") == 0) {
3001 /*
3002 * Arrays are special, since we don't want
3003 * to read the arg as is.
3004 */
3005 right = eval_num_arg(data, size, event, arg->op.right);
3006
3007 /* handle typecasts */
3008 larg = arg->op.left;
3009 while (larg->type == PRINT_TYPE) {
3010 if (!typearg)
3011 typearg = larg;
3012 larg = larg->typecast.item;
3013 }
3014
3015 /* Default to long size */
3016 field_size = pevent->long_size;
3017
3018 switch (larg->type) {
3019 case PRINT_DYNAMIC_ARRAY:
3020 offset = pevent_read_number(pevent,
3021 data + larg->dynarray.field->offset,
3022 larg->dynarray.field->size);
3023 if (larg->dynarray.field->elementsize)
3024 field_size = larg->dynarray.field->elementsize;
3025 /*
3026 * The actual length of the dynamic array is stored
3027 * in the top half of the field, and the offset
3028 * is in the bottom half of the 32 bit field.
3029 */
3030 offset &= 0xffff;
3031 offset += right;
3032 break;
3033 case PRINT_FIELD:
3034 if (!larg->field.field) {
3035 larg->field.field =
3036 pevent_find_any_field(event, larg->field.name);
3037 if (!larg->field.field)
3038 die("field %s not found", larg->field.name);
3039 }
3040 field_size = larg->field.field->elementsize;
3041 offset = larg->field.field->offset +
3042 right * larg->field.field->elementsize;
3043 break;
3044 default:
3045 goto default_op; /* oops, all bets off */
3046 }
3047 val = pevent_read_number(pevent,
3048 data + offset, field_size);
3049 if (typearg)
3050 val = eval_type(val, typearg, 1);
3051 break;
3052 } else if (strcmp(arg->op.op, "?") == 0) {
3053 left = eval_num_arg(data, size, event, arg->op.left);
3054 arg = arg->op.right;
3055 if (left)
3056 val = eval_num_arg(data, size, event, arg->op.left);
3057 else
3058 val = eval_num_arg(data, size, event, arg->op.right);
3059 break;
3060 }
3061 default_op:
3062 left = eval_num_arg(data, size, event, arg->op.left);
3063 right = eval_num_arg(data, size, event, arg->op.right);
3064 switch (arg->op.op[0]) {
3065 case '!':
3066 switch (arg->op.op[1]) {
3067 case 0:
3068 val = !right;
3069 break;
3070 case '=':
3071 val = left != right;
3072 break;
3073 default:
3074 die("unknown op '%s'", arg->op.op);
3075 }
3076 break;
3077 case '~':
3078 val = ~right;
3079 break;
3080 case '|':
3081 if (arg->op.op[1])
3082 val = left || right;
3083 else
3084 val = left | right;
3085 break;
3086 case '&':
3087 if (arg->op.op[1])
3088 val = left && right;
3089 else
3090 val = left & right;
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 switch (arg->op.op[1]) {
3109 case 0:
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 case '=':
3123 if (arg->op.op[1] != '=')
3124 die("unknown op '%s'", arg->op.op);
3125 val = left == right;
3126 break;
3127 case '-':
3128 val = left - right;
3129 break;
3130 case '+':
3131 val = left + right;
3132 break;
3133 case '/':
3134 val = left / right;
3135 break;
3136 case '*':
3137 val = left * right;
3138 break;
3139 default:
3140 die("unknown op '%s'", arg->op.op);
3141 }
3142 break;
3143 default: /* not sure what to do there */
3144 return 0;
3145 }
3146 return val;
3147 }
3148
3149 struct flag {
3150 const char *name;
3151 unsigned long long value;
3152 };
3153
3154 static const struct flag flags[] = {
3155 { "HI_SOFTIRQ", 0 },
3156 { "TIMER_SOFTIRQ", 1 },
3157 { "NET_TX_SOFTIRQ", 2 },
3158 { "NET_RX_SOFTIRQ", 3 },
3159 { "BLOCK_SOFTIRQ", 4 },
3160 { "BLOCK_IOPOLL_SOFTIRQ", 5 },
3161 { "TASKLET_SOFTIRQ", 6 },
3162 { "SCHED_SOFTIRQ", 7 },
3163 { "HRTIMER_SOFTIRQ", 8 },
3164 { "RCU_SOFTIRQ", 9 },
3165
3166 { "HRTIMER_NORESTART", 0 },
3167 { "HRTIMER_RESTART", 1 },
3168 };
3169
3170 static unsigned long long eval_flag(const char *flag)
3171 {
3172 int i;
3173
3174 /*
3175 * Some flags in the format files do not get converted.
3176 * If the flag is not numeric, see if it is something that
3177 * we already know about.
3178 */
3179 if (isdigit(flag[0]))
3180 return strtoull(flag, NULL, 0);
3181
3182 for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3183 if (strcmp(flags[i].name, flag) == 0)
3184 return flags[i].value;
3185
3186 return 0;
3187 }
3188
3189 static void print_str_to_seq(struct trace_seq *s, const char *format,
3190 int len_arg, const char *str)
3191 {
3192 if (len_arg >= 0)
3193 trace_seq_printf(s, format, len_arg, str);
3194 else
3195 trace_seq_printf(s, format, str);
3196 }
3197
3198 static void print_str_arg(struct trace_seq *s, void *data, int size,
3199 struct event_format *event, const char *format,
3200 int len_arg, struct print_arg *arg)
3201 {
3202 struct pevent *pevent = event->pevent;
3203 struct print_flag_sym *flag;
3204 unsigned long long val, fval;
3205 unsigned long addr;
3206 char *str;
3207 int print;
3208 int len;
3209
3210 switch (arg->type) {
3211 case PRINT_NULL:
3212 /* ?? */
3213 return;
3214 case PRINT_ATOM:
3215 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3216 return;
3217 case PRINT_FIELD:
3218 if (!arg->field.field) {
3219 arg->field.field = pevent_find_any_field(event, arg->field.name);
3220 if (!arg->field.field)
3221 die("field %s not found", arg->field.name);
3222 }
3223 /* Zero sized fields, mean the rest of the data */
3224 len = arg->field.field->size ? : size - arg->field.field->offset;
3225
3226 /*
3227 * Some events pass in pointers. If this is not an array
3228 * and the size is the same as long_size, assume that it
3229 * is a pointer.
3230 */
3231 if (!(arg->field.field->flags & FIELD_IS_ARRAY) &&
3232 arg->field.field->size == pevent->long_size) {
3233 addr = *(unsigned long *)(data + arg->field.field->offset);
3234 trace_seq_printf(s, "%lx", addr);
3235 break;
3236 }
3237 str = malloc_or_die(len + 1);
3238 memcpy(str, data + arg->field.field->offset, len);
3239 str[len] = 0;
3240 print_str_to_seq(s, format, len_arg, str);
3241 free(str);
3242 break;
3243 case PRINT_FLAGS:
3244 val = eval_num_arg(data, size, event, arg->flags.field);
3245 print = 0;
3246 for (flag = arg->flags.flags; flag; flag = flag->next) {
3247 fval = eval_flag(flag->value);
3248 if (!val && !fval) {
3249 print_str_to_seq(s, format, len_arg, flag->str);
3250 break;
3251 }
3252 if (fval && (val & fval) == fval) {
3253 if (print && arg->flags.delim)
3254 trace_seq_puts(s, arg->flags.delim);
3255 print_str_to_seq(s, format, len_arg, flag->str);
3256 print = 1;
3257 val &= ~fval;
3258 }
3259 }
3260 break;
3261 case PRINT_SYMBOL:
3262 val = eval_num_arg(data, size, event, arg->symbol.field);
3263 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3264 fval = eval_flag(flag->value);
3265 if (val == fval) {
3266 print_str_to_seq(s, format, len_arg, flag->str);
3267 break;
3268 }
3269 }
3270 break;
3271
3272 case PRINT_TYPE:
3273 break;
3274 case PRINT_STRING: {
3275 int str_offset;
3276
3277 if (arg->string.offset == -1) {
3278 struct format_field *f;
3279
3280 f = pevent_find_any_field(event, arg->string.string);
3281 arg->string.offset = f->offset;
3282 }
3283 str_offset = data2host4(pevent, data + arg->string.offset);
3284 str_offset &= 0xffff;
3285 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
3286 break;
3287 }
3288 case PRINT_BSTRING:
3289 trace_seq_printf(s, format, arg->string.string);
3290 break;
3291 case PRINT_OP:
3292 /*
3293 * The only op for string should be ? :
3294 */
3295 if (arg->op.op[0] != '?')
3296 return;
3297 val = eval_num_arg(data, size, event, arg->op.left);
3298 if (val)
3299 print_str_arg(s, data, size, event,
3300 format, len_arg, arg->op.right->op.left);
3301 else
3302 print_str_arg(s, data, size, event,
3303 format, len_arg, arg->op.right->op.right);
3304 break;
3305 case PRINT_FUNC:
3306 process_defined_func(s, data, size, event, arg);
3307 break;
3308 default:
3309 /* well... */
3310 break;
3311 }
3312 }
3313
3314 static unsigned long long
3315 process_defined_func(struct trace_seq *s, void *data, int size,
3316 struct event_format *event, struct print_arg *arg)
3317 {
3318 struct pevent_function_handler *func_handle = arg->func.func;
3319 struct pevent_func_params *param;
3320 unsigned long long *args;
3321 unsigned long long ret;
3322 struct print_arg *farg;
3323 struct trace_seq str;
3324 struct save_str {
3325 struct save_str *next;
3326 char *str;
3327 } *strings = NULL, *string;
3328 int i;
3329
3330 if (!func_handle->nr_args) {
3331 ret = (*func_handle->func)(s, NULL);
3332 goto out;
3333 }
3334
3335 farg = arg->func.args;
3336 param = func_handle->params;
3337
3338 args = malloc_or_die(sizeof(*args) * func_handle->nr_args);
3339 for (i = 0; i < func_handle->nr_args; i++) {
3340 switch (param->type) {
3341 case PEVENT_FUNC_ARG_INT:
3342 case PEVENT_FUNC_ARG_LONG:
3343 case PEVENT_FUNC_ARG_PTR:
3344 args[i] = eval_num_arg(data, size, event, farg);
3345 break;
3346 case PEVENT_FUNC_ARG_STRING:
3347 trace_seq_init(&str);
3348 print_str_arg(&str, data, size, event, "%s", -1, farg);
3349 trace_seq_terminate(&str);
3350 string = malloc_or_die(sizeof(*string));
3351 string->next = strings;
3352 string->str = strdup(str.buffer);
3353 strings = string;
3354 trace_seq_destroy(&str);
3355 break;
3356 default:
3357 /*
3358 * Something went totally wrong, this is not
3359 * an input error, something in this code broke.
3360 */
3361 die("Unexpected end of arguments\n");
3362 break;
3363 }
3364 farg = farg->next;
3365 }
3366
3367 ret = (*func_handle->func)(s, args);
3368 free(args);
3369 while (strings) {
3370 string = strings;
3371 strings = string->next;
3372 free(string->str);
3373 free(string);
3374 }
3375
3376 out:
3377 /* TBD : handle return type here */
3378 return ret;
3379 }
3380
3381 static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
3382 {
3383 struct pevent *pevent = event->pevent;
3384 struct format_field *field, *ip_field;
3385 struct print_arg *args, *arg, **next;
3386 unsigned long long ip, val;
3387 char *ptr;
3388 void *bptr;
3389
3390 field = pevent->bprint_buf_field;
3391 ip_field = pevent->bprint_ip_field;
3392
3393 if (!field) {
3394 field = pevent_find_field(event, "buf");
3395 if (!field)
3396 die("can't find buffer field for binary printk");
3397 ip_field = pevent_find_field(event, "ip");
3398 if (!ip_field)
3399 die("can't find ip field for binary printk");
3400 pevent->bprint_buf_field = field;
3401 pevent->bprint_ip_field = ip_field;
3402 }
3403
3404 ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
3405
3406 /*
3407 * The first arg is the IP pointer.
3408 */
3409 args = alloc_arg();
3410 arg = args;
3411 arg->next = NULL;
3412 next = &arg->next;
3413
3414 arg->type = PRINT_ATOM;
3415 arg->atom.atom = malloc_or_die(32);
3416 sprintf(arg->atom.atom, "%lld", ip);
3417
3418 /* skip the first "%pf : " */
3419 for (ptr = fmt + 6, bptr = data + field->offset;
3420 bptr < data + size && *ptr; ptr++) {
3421 int ls = 0;
3422
3423 if (*ptr == '%') {
3424 process_again:
3425 ptr++;
3426 switch (*ptr) {
3427 case '%':
3428 break;
3429 case 'l':
3430 ls++;
3431 goto process_again;
3432 case 'L':
3433 ls = 2;
3434 goto process_again;
3435 case '0' ... '9':
3436 goto process_again;
3437 case 'p':
3438 ls = 1;
3439 /* fall through */
3440 case 'd':
3441 case 'u':
3442 case 'x':
3443 case 'i':
3444 /* the pointers are always 4 bytes aligned */
3445 bptr = (void *)(((unsigned long)bptr + 3) &
3446 ~3);
3447 switch (ls) {
3448 case 0:
3449 ls = 4;
3450 break;
3451 case 1:
3452 ls = pevent->long_size;
3453 break;
3454 case 2:
3455 ls = 8;
3456 default:
3457 break;
3458 }
3459 val = pevent_read_number(pevent, bptr, ls);
3460 bptr += ls;
3461 arg = alloc_arg();
3462 arg->next = NULL;
3463 arg->type = PRINT_ATOM;
3464 arg->atom.atom = malloc_or_die(32);
3465 sprintf(arg->atom.atom, "%lld", val);
3466 *next = arg;
3467 next = &arg->next;
3468 break;
3469 case 's':
3470 arg = alloc_arg();
3471 arg->next = NULL;
3472 arg->type = PRINT_BSTRING;
3473 arg->string.string = strdup(bptr);
3474 bptr += strlen(bptr) + 1;
3475 *next = arg;
3476 next = &arg->next;
3477 default:
3478 break;
3479 }
3480 }
3481 }
3482
3483 return args;
3484 }
3485
3486 static void free_args(struct print_arg *args)
3487 {
3488 struct print_arg *next;
3489
3490 while (args) {
3491 next = args->next;
3492
3493 free_arg(args);
3494 args = next;
3495 }
3496 }
3497
3498 static char *
3499 get_bprint_format(void *data, int size __unused, struct event_format *event)
3500 {
3501 struct pevent *pevent = event->pevent;
3502 unsigned long long addr;
3503 struct format_field *field;
3504 struct printk_map *printk;
3505 char *format;
3506 char *p;
3507
3508 field = pevent->bprint_fmt_field;
3509
3510 if (!field) {
3511 field = pevent_find_field(event, "fmt");
3512 if (!field)
3513 die("can't find format field for binary printk");
3514 pevent->bprint_fmt_field = field;
3515 }
3516
3517 addr = pevent_read_number(pevent, data + field->offset, field->size);
3518
3519 printk = find_printk(pevent, addr);
3520 if (!printk) {
3521 format = malloc_or_die(45);
3522 sprintf(format, "%%pf : (NO FORMAT FOUND at %llx)\n",
3523 addr);
3524 return format;
3525 }
3526
3527 p = printk->printk;
3528 /* Remove any quotes. */
3529 if (*p == '"')
3530 p++;
3531 format = malloc_or_die(strlen(p) + 10);
3532 sprintf(format, "%s : %s", "%pf", p);
3533 /* remove ending quotes and new line since we will add one too */
3534 p = format + strlen(format) - 1;
3535 if (*p == '"')
3536 *p = 0;
3537
3538 p -= 2;
3539 if (strcmp(p, "\\n") == 0)
3540 *p = 0;
3541
3542 return format;
3543 }
3544
3545 static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
3546 struct event_format *event, struct print_arg *arg)
3547 {
3548 unsigned char *buf;
3549 char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
3550
3551 if (arg->type == PRINT_FUNC) {
3552 process_defined_func(s, data, size, event, arg);
3553 return;
3554 }
3555
3556 if (arg->type != PRINT_FIELD) {
3557 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
3558 arg->type);
3559 return;
3560 }
3561
3562 if (mac == 'm')
3563 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
3564 if (!arg->field.field) {
3565 arg->field.field =
3566 pevent_find_any_field(event, arg->field.name);
3567 if (!arg->field.field)
3568 die("field %s not found", arg->field.name);
3569 }
3570 if (arg->field.field->size != 6) {
3571 trace_seq_printf(s, "INVALIDMAC");
3572 return;
3573 }
3574 buf = data + arg->field.field->offset;
3575 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
3576 }
3577
3578 static void print_event_fields(struct trace_seq *s, void *data, int size,
3579 struct event_format *event)
3580 {
3581 struct format_field *field;
3582 unsigned long long val;
3583 unsigned int offset, len, i;
3584
3585 field = event->format.fields;
3586 while (field) {
3587 trace_seq_printf(s, " %s=", field->name);
3588 if (field->flags & FIELD_IS_ARRAY) {
3589 offset = field->offset;
3590 len = field->size;
3591 if (field->flags & FIELD_IS_DYNAMIC) {
3592 val = pevent_read_number(event->pevent, data + offset, len);
3593 offset = val;
3594 len = offset >> 16;
3595 offset &= 0xffff;
3596 }
3597 if (field->flags & FIELD_IS_STRING) {
3598 trace_seq_printf(s, "%s", (char *)data + offset);
3599 } else {
3600 trace_seq_puts(s, "ARRAY[");
3601 for (i = 0; i < len; i++) {
3602 if (i)
3603 trace_seq_puts(s, ", ");
3604 trace_seq_printf(s, "%02x",
3605 *((unsigned char *)data + offset + i));
3606 }
3607 trace_seq_putc(s, ']');
3608 }
3609 } else {
3610 val = pevent_read_number(event->pevent, data + field->offset,
3611 field->size);
3612 if (field->flags & FIELD_IS_POINTER) {
3613 trace_seq_printf(s, "0x%llx", val);
3614 } else if (field->flags & FIELD_IS_SIGNED) {
3615 switch (field->size) {
3616 case 4:
3617 /*
3618 * If field is long then print it in hex.
3619 * A long usually stores pointers.
3620 */
3621 if (field->flags & FIELD_IS_LONG)
3622 trace_seq_printf(s, "0x%x", (int)val);
3623 else
3624 trace_seq_printf(s, "%d", (int)val);
3625 break;
3626 case 2:
3627 trace_seq_printf(s, "%2d", (short)val);
3628 break;
3629 case 1:
3630 trace_seq_printf(s, "%1d", (char)val);
3631 break;
3632 default:
3633 trace_seq_printf(s, "%lld", val);
3634 }
3635 } else {
3636 if (field->flags & FIELD_IS_LONG)
3637 trace_seq_printf(s, "0x%llx", val);
3638 else
3639 trace_seq_printf(s, "%llu", val);
3640 }
3641 }
3642 field = field->next;
3643 }
3644 }
3645
3646 static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
3647 {
3648 struct pevent *pevent = event->pevent;
3649 struct print_fmt *print_fmt = &event->print_fmt;
3650 struct print_arg *arg = print_fmt->args;
3651 struct print_arg *args = NULL;
3652 const char *ptr = print_fmt->format;
3653 unsigned long long val;
3654 struct func_map *func;
3655 const char *saveptr;
3656 char *bprint_fmt = NULL;
3657 char format[32];
3658 int show_func;
3659 int len_as_arg;
3660 int len_arg;
3661 int len;
3662 int ls;
3663
3664 if (event->flags & EVENT_FL_FAILED) {
3665 trace_seq_printf(s, "[FAILED TO PARSE]");
3666 print_event_fields(s, data, size, event);
3667 return;
3668 }
3669
3670 if (event->flags & EVENT_FL_ISBPRINT) {
3671 bprint_fmt = get_bprint_format(data, size, event);
3672 args = make_bprint_args(bprint_fmt, data, size, event);
3673 arg = args;
3674 ptr = bprint_fmt;
3675 }
3676
3677 for (; *ptr; ptr++) {
3678 ls = 0;
3679 if (*ptr == '\\') {
3680 ptr++;
3681 switch (*ptr) {
3682 case 'n':
3683 trace_seq_putc(s, '\n');
3684 break;
3685 case 't':
3686 trace_seq_putc(s, '\t');
3687 break;
3688 case 'r':
3689 trace_seq_putc(s, '\r');
3690 break;
3691 case '\\':
3692 trace_seq_putc(s, '\\');
3693 break;
3694 default:
3695 trace_seq_putc(s, *ptr);
3696 break;
3697 }
3698
3699 } else if (*ptr == '%') {
3700 saveptr = ptr;
3701 show_func = 0;
3702 len_as_arg = 0;
3703 cont_process:
3704 ptr++;
3705 switch (*ptr) {
3706 case '%':
3707 trace_seq_putc(s, '%');
3708 break;
3709 case '#':
3710 /* FIXME: need to handle properly */
3711 goto cont_process;
3712 case 'h':
3713 ls--;
3714 goto cont_process;
3715 case 'l':
3716 ls++;
3717 goto cont_process;
3718 case 'L':
3719 ls = 2;
3720 goto cont_process;
3721 case '*':
3722 /* The argument is the length. */
3723 if (!arg)
3724 die("no argument match");
3725 len_arg = eval_num_arg(data, size, event, arg);
3726 len_as_arg = 1;
3727 arg = arg->next;
3728 goto cont_process;
3729 case '.':
3730 case 'z':
3731 case 'Z':
3732 case '0' ... '9':
3733 goto cont_process;
3734 case 'p':
3735 if (pevent->long_size == 4)
3736 ls = 1;
3737 else
3738 ls = 2;
3739
3740 if (*(ptr+1) == 'F' ||
3741 *(ptr+1) == 'f') {
3742 ptr++;
3743 show_func = *ptr;
3744 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
3745 print_mac_arg(s, *(ptr+1), data, size, event, arg);
3746 ptr++;
3747 break;
3748 }
3749
3750 /* fall through */
3751 case 'd':
3752 case 'i':
3753 case 'x':
3754 case 'X':
3755 case 'u':
3756 if (!arg)
3757 die("no argument match");
3758
3759 len = ((unsigned long)ptr + 1) -
3760 (unsigned long)saveptr;
3761
3762 /* should never happen */
3763 if (len > 31)
3764 die("bad format!");
3765
3766 memcpy(format, saveptr, len);
3767 format[len] = 0;
3768
3769 val = eval_num_arg(data, size, event, arg);
3770 arg = arg->next;
3771
3772 if (show_func) {
3773 func = find_func(pevent, val);
3774 if (func) {
3775 trace_seq_puts(s, func->func);
3776 if (show_func == 'F')
3777 trace_seq_printf(s,
3778 "+0x%llx",
3779 val - func->addr);
3780 break;
3781 }
3782 }
3783 if (pevent->long_size == 8 && ls) {
3784 char *p;
3785
3786 ls = 2;
3787 /* make %l into %ll */
3788 p = strchr(format, 'l');
3789 if (p)
3790 memmove(p, p+1, strlen(p)+1);
3791 else if (strcmp(format, "%p") == 0)
3792 strcpy(format, "0x%llx");
3793 }
3794 switch (ls) {
3795 case -2:
3796 if (len_as_arg)
3797 trace_seq_printf(s, format, len_arg, (char)val);
3798 else
3799 trace_seq_printf(s, format, (char)val);
3800 break;
3801 case -1:
3802 if (len_as_arg)
3803 trace_seq_printf(s, format, len_arg, (short)val);
3804 else
3805 trace_seq_printf(s, format, (short)val);
3806 break;
3807 case 0:
3808 if (len_as_arg)
3809 trace_seq_printf(s, format, len_arg, (int)val);
3810 else
3811 trace_seq_printf(s, format, (int)val);
3812 break;
3813 case 1:
3814 if (len_as_arg)
3815 trace_seq_printf(s, format, len_arg, (long)val);
3816 else
3817 trace_seq_printf(s, format, (long)val);
3818 break;
3819 case 2:
3820 if (len_as_arg)
3821 trace_seq_printf(s, format, len_arg,
3822 (long long)val);
3823 else
3824 trace_seq_printf(s, format, (long long)val);
3825 break;
3826 default:
3827 die("bad count (%d)", ls);
3828 }
3829 break;
3830 case 's':
3831 if (!arg)
3832 die("no matching argument");
3833
3834 len = ((unsigned long)ptr + 1) -
3835 (unsigned long)saveptr;
3836
3837 /* should never happen */
3838 if (len > 31)
3839 die("bad format!");
3840
3841 memcpy(format, saveptr, len);
3842 format[len] = 0;
3843 if (!len_as_arg)
3844 len_arg = -1;
3845 print_str_arg(s, data, size, event,
3846 format, len_arg, arg);
3847 arg = arg->next;
3848 break;
3849 default:
3850 trace_seq_printf(s, ">%c<", *ptr);
3851
3852 }
3853 } else
3854 trace_seq_putc(s, *ptr);
3855 }
3856
3857 if (args) {
3858 free_args(args);
3859 free(bprint_fmt);
3860 }
3861 }
3862
3863 /**
3864 * pevent_data_lat_fmt - parse the data for the latency format
3865 * @pevent: a handle to the pevent
3866 * @s: the trace_seq to write to
3867 * @data: the raw data to read from
3868 * @size: currently unused.
3869 *
3870 * This parses out the Latency format (interrupts disabled,
3871 * need rescheduling, in hard/soft interrupt, preempt count
3872 * and lock depth) and places it into the trace_seq.
3873 */
3874 void pevent_data_lat_fmt(struct pevent *pevent,
3875 struct trace_seq *s, struct record *record)
3876 {
3877 static int check_lock_depth = 1;
3878 static int lock_depth_exists;
3879 unsigned int lat_flags;
3880 unsigned int pc;
3881 int lock_depth;
3882 int hardirq;
3883 int softirq;
3884 void *data = record->data;
3885
3886 lat_flags = parse_common_flags(pevent, data);
3887 pc = parse_common_pc(pevent, data);
3888 /* lock_depth may not always exist */
3889 if (check_lock_depth) {
3890 struct format_field *field;
3891 struct event_format *event;
3892
3893 check_lock_depth = 0;
3894 event = pevent->events[0];
3895 field = pevent_find_common_field(event, "common_lock_depth");
3896 if (field)
3897 lock_depth_exists = 1;
3898 }
3899 if (lock_depth_exists)
3900 lock_depth = parse_common_lock_depth(pevent, data);
3901
3902 hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
3903 softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
3904
3905 trace_seq_printf(s, "%c%c%c",
3906 (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
3907 (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
3908 'X' : '.',
3909 (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
3910 'N' : '.',
3911 (hardirq && softirq) ? 'H' :
3912 hardirq ? 'h' : softirq ? 's' : '.');
3913
3914 if (pc)
3915 trace_seq_printf(s, "%x", pc);
3916 else
3917 trace_seq_putc(s, '.');
3918
3919 if (lock_depth_exists) {
3920 if (lock_depth < 0)
3921 trace_seq_putc(s, '.');
3922 else
3923 trace_seq_printf(s, "%d", lock_depth);
3924 }
3925
3926 trace_seq_terminate(s);
3927 }
3928
3929 /**
3930 * pevent_data_type - parse out the given event type
3931 * @pevent: a handle to the pevent
3932 * @rec: the record to read from
3933 *
3934 * This returns the event id from the @rec.
3935 */
3936 int pevent_data_type(struct pevent *pevent, struct record *rec)
3937 {
3938 return trace_parse_common_type(pevent, rec->data);
3939 }
3940
3941 /**
3942 * pevent_data_event_from_type - find the event by a given type
3943 * @pevent: a handle to the pevent
3944 * @type: the type of the event.
3945 *
3946 * This returns the event form a given @type;
3947 */
3948 struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
3949 {
3950 return pevent_find_event(pevent, type);
3951 }
3952
3953 /**
3954 * pevent_data_pid - parse the PID from raw data
3955 * @pevent: a handle to the pevent
3956 * @rec: the record to parse
3957 *
3958 * This returns the PID from a raw data.
3959 */
3960 int pevent_data_pid(struct pevent *pevent, struct record *rec)
3961 {
3962 return parse_common_pid(pevent, rec->data);
3963 }
3964
3965 /**
3966 * pevent_data_comm_from_pid - return the command line from PID
3967 * @pevent: a handle to the pevent
3968 * @pid: the PID of the task to search for
3969 *
3970 * This returns a pointer to the command line that has the given
3971 * @pid.
3972 */
3973 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
3974 {
3975 const char *comm;
3976
3977 comm = find_cmdline(pevent, pid);
3978 return comm;
3979 }
3980
3981 /**
3982 * pevent_data_comm_from_pid - parse the data into the print format
3983 * @s: the trace_seq to write to
3984 * @event: the handle to the event
3985 * @cpu: the cpu the event was recorded on
3986 * @data: the raw data
3987 * @size: the size of the raw data
3988 * @nsecs: the timestamp of the event
3989 *
3990 * This parses the raw @data using the given @event information and
3991 * writes the print format into the trace_seq.
3992 */
3993 void pevent_event_info(struct trace_seq *s, struct event_format *event,
3994 struct record *record)
3995 {
3996 int print_pretty = 1;
3997
3998 if (event->pevent->print_raw)
3999 print_event_fields(s, record->data, record->size, event);
4000 else {
4001
4002 if (event->handler)
4003 print_pretty = event->handler(s, record, event,
4004 event->context);
4005
4006 if (print_pretty)
4007 pretty_print(s, record->data, record->size, event);
4008 }
4009
4010 trace_seq_terminate(s);
4011 }
4012
4013 void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
4014 struct record *record)
4015 {
4016 static char *spaces = " "; /* 20 spaces */
4017 struct event_format *event;
4018 unsigned long secs;
4019 unsigned long usecs;
4020 unsigned long nsecs;
4021 const char *comm;
4022 void *data = record->data;
4023 int type;
4024 int pid;
4025 int len;
4026 int p;
4027
4028 secs = record->ts / NSECS_PER_SEC;
4029 nsecs = record->ts - secs * NSECS_PER_SEC;
4030
4031 if (record->size < 0) {
4032 do_warning("ug! negative record size %d", record->size);
4033 return;
4034 }
4035
4036 type = trace_parse_common_type(pevent, data);
4037
4038 event = pevent_find_event(pevent, type);
4039 if (!event) {
4040 do_warning("ug! no event found for type %d", type);
4041 return;
4042 }
4043
4044 pid = parse_common_pid(pevent, data);
4045 comm = find_cmdline(pevent, pid);
4046
4047 if (pevent->latency_format) {
4048 trace_seq_printf(s, "%8.8s-%-5d %3d",
4049 comm, pid, record->cpu);
4050 pevent_data_lat_fmt(pevent, s, record);
4051 } else
4052 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
4053
4054 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
4055 usecs = nsecs;
4056 p = 9;
4057 } else {
4058 usecs = (nsecs + 500) / NSECS_PER_USEC;
4059 p = 6;
4060 }
4061
4062 trace_seq_printf(s, " %5lu.%0*lu: %s: ", secs, p, usecs, event->name);
4063
4064 /* Space out the event names evenly. */
4065 len = strlen(event->name);
4066 if (len < 20)
4067 trace_seq_printf(s, "%.*s", 20 - len, spaces);
4068
4069 pevent_event_info(s, event, record);
4070 }
4071
4072 static int events_id_cmp(const void *a, const void *b)
4073 {
4074 struct event_format * const * ea = a;
4075 struct event_format * const * eb = b;
4076
4077 if ((*ea)->id < (*eb)->id)
4078 return -1;
4079
4080 if ((*ea)->id > (*eb)->id)
4081 return 1;
4082
4083 return 0;
4084 }
4085
4086 static int events_name_cmp(const void *a, const void *b)
4087 {
4088 struct event_format * const * ea = a;
4089 struct event_format * const * eb = b;
4090 int res;
4091
4092 res = strcmp((*ea)->name, (*eb)->name);
4093 if (res)
4094 return res;
4095
4096 res = strcmp((*ea)->system, (*eb)->system);
4097 if (res)
4098 return res;
4099
4100 return events_id_cmp(a, b);
4101 }
4102
4103 static int events_system_cmp(const void *a, const void *b)
4104 {
4105 struct event_format * const * ea = a;
4106 struct event_format * const * eb = b;
4107 int res;
4108
4109 res = strcmp((*ea)->system, (*eb)->system);
4110 if (res)
4111 return res;
4112
4113 res = strcmp((*ea)->name, (*eb)->name);
4114 if (res)
4115 return res;
4116
4117 return events_id_cmp(a, b);
4118 }
4119
4120 struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
4121 {
4122 struct event_format **events;
4123 int (*sort)(const void *a, const void *b);
4124
4125 events = pevent->sort_events;
4126
4127 if (events && pevent->last_type == sort_type)
4128 return events;
4129
4130 if (!events) {
4131 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
4132 if (!events)
4133 return NULL;
4134
4135 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
4136 events[pevent->nr_events] = NULL;
4137
4138 pevent->sort_events = events;
4139
4140 /* the internal events are sorted by id */
4141 if (sort_type == EVENT_SORT_ID) {
4142 pevent->last_type = sort_type;
4143 return events;
4144 }
4145 }
4146
4147 switch (sort_type) {
4148 case EVENT_SORT_ID:
4149 sort = events_id_cmp;
4150 break;
4151 case EVENT_SORT_NAME:
4152 sort = events_name_cmp;
4153 break;
4154 case EVENT_SORT_SYSTEM:
4155 sort = events_system_cmp;
4156 break;
4157 default:
4158 return events;
4159 }
4160
4161 qsort(events, pevent->nr_events, sizeof(*events), sort);
4162 pevent->last_type = sort_type;
4163
4164 return events;
4165 }
4166
4167 static struct format_field **
4168 get_event_fields(const char *type, const char *name,
4169 int count, struct format_field *list)
4170 {
4171 struct format_field **fields;
4172 struct format_field *field;
4173 int i = 0;
4174
4175 fields = malloc_or_die(sizeof(*fields) * (count + 1));
4176 for (field = list; field; field = field->next) {
4177 fields[i++] = field;
4178 if (i == count + 1) {
4179 do_warning("event %s has more %s fields than specified",
4180 name, type);
4181 i--;
4182 break;
4183 }
4184 }
4185
4186 if (i != count)
4187 do_warning("event %s has less %s fields than specified",
4188 name, type);
4189
4190 fields[i] = NULL;
4191
4192 return fields;
4193 }
4194
4195 /**
4196 * pevent_event_common_fields - return a list of common fields for an event
4197 * @event: the event to return the common fields of.
4198 *
4199 * Returns an allocated array of fields. The last item in the array is NULL.
4200 * The array must be freed with free().
4201 */
4202 struct format_field **pevent_event_common_fields(struct event_format *event)
4203 {
4204 return get_event_fields("common", event->name,
4205 event->format.nr_common,
4206 event->format.common_fields);
4207 }
4208
4209 /**
4210 * pevent_event_fields - return a list of event specific fields for an event
4211 * @event: the event to return the fields of.
4212 *
4213 * Returns an allocated array of fields. The last item in the array is NULL.
4214 * The array must be freed with free().
4215 */
4216 struct format_field **pevent_event_fields(struct event_format *event)
4217 {
4218 return get_event_fields("event", event->name,
4219 event->format.nr_fields,
4220 event->format.fields);
4221 }
4222
4223 static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
4224 {
4225 trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
4226 if (field->next) {
4227 trace_seq_puts(s, ", ");
4228 print_fields(s, field->next);
4229 }
4230 }
4231
4232 /* for debugging */
4233 static void print_args(struct print_arg *args)
4234 {
4235 int print_paren = 1;
4236 struct trace_seq s;
4237
4238 switch (args->type) {
4239 case PRINT_NULL:
4240 printf("null");
4241 break;
4242 case PRINT_ATOM:
4243 printf("%s", args->atom.atom);
4244 break;
4245 case PRINT_FIELD:
4246 printf("REC->%s", args->field.name);
4247 break;
4248 case PRINT_FLAGS:
4249 printf("__print_flags(");
4250 print_args(args->flags.field);
4251 printf(", %s, ", args->flags.delim);
4252 trace_seq_init(&s);
4253 print_fields(&s, args->flags.flags);
4254 trace_seq_do_printf(&s);
4255 trace_seq_destroy(&s);
4256 printf(")");
4257 break;
4258 case PRINT_SYMBOL:
4259 printf("__print_symbolic(");
4260 print_args(args->symbol.field);
4261 printf(", ");
4262 trace_seq_init(&s);
4263 print_fields(&s, args->symbol.symbols);
4264 trace_seq_do_printf(&s);
4265 trace_seq_destroy(&s);
4266 printf(")");
4267 break;
4268 case PRINT_STRING:
4269 case PRINT_BSTRING:
4270 printf("__get_str(%s)", args->string.string);
4271 break;
4272 case PRINT_TYPE:
4273 printf("(%s)", args->typecast.type);
4274 print_args(args->typecast.item);
4275 break;
4276 case PRINT_OP:
4277 if (strcmp(args->op.op, ":") == 0)
4278 print_paren = 0;
4279 if (print_paren)
4280 printf("(");
4281 print_args(args->op.left);
4282 printf(" %s ", args->op.op);
4283 print_args(args->op.right);
4284 if (print_paren)
4285 printf(")");
4286 break;
4287 default:
4288 /* we should warn... */
4289 return;
4290 }
4291 if (args->next) {
4292 printf("\n");
4293 print_args(args->next);
4294 }
4295 }
4296
4297 static void parse_header_field(const char *field,
4298 int *offset, int *size, int mandatory)
4299 {
4300 unsigned long long save_input_buf_ptr;
4301 unsigned long long save_input_buf_siz;
4302 char *token;
4303 int type;
4304
4305 save_input_buf_ptr = input_buf_ptr;
4306 save_input_buf_siz = input_buf_siz;
4307
4308 if (read_expected(EVENT_ITEM, "field") < 0)
4309 return;
4310 if (read_expected(EVENT_OP, ":") < 0)
4311 return;
4312
4313 /* type */
4314 if (read_expect_type(EVENT_ITEM, &token) < 0)
4315 goto fail;
4316 free_token(token);
4317
4318 /*
4319 * If this is not a mandatory field, then test it first.
4320 */
4321 if (mandatory) {
4322 if (read_expected(EVENT_ITEM, field) < 0)
4323 return;
4324 } else {
4325 if (read_expect_type(EVENT_ITEM, &token) < 0)
4326 goto fail;
4327 if (strcmp(token, field) != 0)
4328 goto discard;
4329 free_token(token);
4330 }
4331
4332 if (read_expected(EVENT_OP, ";") < 0)
4333 return;
4334 if (read_expected(EVENT_ITEM, "offset") < 0)
4335 return;
4336 if (read_expected(EVENT_OP, ":") < 0)
4337 return;
4338 if (read_expect_type(EVENT_ITEM, &token) < 0)
4339 goto fail;
4340 *offset = atoi(token);
4341 free_token(token);
4342 if (read_expected(EVENT_OP, ";") < 0)
4343 return;
4344 if (read_expected(EVENT_ITEM, "size") < 0)
4345 return;
4346 if (read_expected(EVENT_OP, ":") < 0)
4347 return;
4348 if (read_expect_type(EVENT_ITEM, &token) < 0)
4349 goto fail;
4350 *size = atoi(token);
4351 free_token(token);
4352 if (read_expected(EVENT_OP, ";") < 0)
4353 return;
4354 type = read_token(&token);
4355 if (type != EVENT_NEWLINE) {
4356 /* newer versions of the kernel have a "signed" type */
4357 if (type != EVENT_ITEM)
4358 goto fail;
4359
4360 if (strcmp(token, "signed") != 0)
4361 goto fail;
4362
4363 free_token(token);
4364
4365 if (read_expected(EVENT_OP, ":") < 0)
4366 return;
4367
4368 if (read_expect_type(EVENT_ITEM, &token))
4369 goto fail;
4370
4371 free_token(token);
4372 if (read_expected(EVENT_OP, ";") < 0)
4373 return;
4374
4375 if (read_expect_type(EVENT_NEWLINE, &token))
4376 goto fail;
4377 }
4378 fail:
4379 free_token(token);
4380 return;
4381
4382 discard:
4383 input_buf_ptr = save_input_buf_ptr;
4384 input_buf_siz = save_input_buf_siz;
4385 *offset = 0;
4386 *size = 0;
4387 free_token(token);
4388 }
4389
4390 /**
4391 * pevent_parse_header_page - parse the data stored in the header page
4392 * @pevent: the handle to the pevent
4393 * @buf: the buffer storing the header page format string
4394 * @size: the size of @buf
4395 * @long_size: the long size to use if there is no header
4396 *
4397 * This parses the header page format for information on the
4398 * ring buffer used. The @buf should be copied from
4399 *
4400 * /sys/kernel/debug/tracing/events/header_page
4401 */
4402 int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
4403 int long_size)
4404 {
4405 int ignore;
4406
4407 if (!size) {
4408 /*
4409 * Old kernels did not have header page info.
4410 * Sorry but we just use what we find here in user space.
4411 */
4412 pevent->header_page_ts_size = sizeof(long long);
4413 pevent->header_page_size_size = long_size;
4414 pevent->header_page_data_offset = sizeof(long long) + long_size;
4415 pevent->old_format = 1;
4416 return -1;
4417 }
4418 init_input_buf(buf, size);
4419
4420 parse_header_field("timestamp", &pevent->header_page_ts_offset,
4421 &pevent->header_page_ts_size, 1);
4422 parse_header_field("commit", &pevent->header_page_size_offset,
4423 &pevent->header_page_size_size, 1);
4424 parse_header_field("overwrite", &pevent->header_page_overwrite,
4425 &ignore, 0);
4426 parse_header_field("data", &pevent->header_page_data_offset,
4427 &pevent->header_page_data_size, 1);
4428
4429 return 0;
4430 }
4431
4432 static int event_matches(struct event_format *event,
4433 int id, const char *sys_name,
4434 const char *event_name)
4435 {
4436 if (id >= 0 && id != event->id)
4437 return 0;
4438
4439 if (event_name && (strcmp(event_name, event->name) != 0))
4440 return 0;
4441
4442 if (sys_name && (strcmp(sys_name, event->system) != 0))
4443 return 0;
4444
4445 return 1;
4446 }
4447
4448 static void free_handler(struct event_handler *handle)
4449 {
4450 free((void *)handle->sys_name);
4451 free((void *)handle->event_name);
4452 free(handle);
4453 }
4454
4455 static int find_event_handle(struct pevent *pevent, struct event_format *event)
4456 {
4457 struct event_handler *handle, **next;
4458
4459 for (next = &pevent->handlers; *next;
4460 next = &(*next)->next) {
4461 handle = *next;
4462 if (event_matches(event, handle->id,
4463 handle->sys_name,
4464 handle->event_name))
4465 break;
4466 }
4467
4468 if (!(*next))
4469 return 0;
4470
4471 pr_stat("overriding event (%d) %s:%s with new print handler",
4472 event->id, event->system, event->name);
4473
4474 event->handler = handle->func;
4475 event->context = handle->context;
4476
4477 *next = handle->next;
4478 free_handler(handle);
4479
4480 return 1;
4481 }
4482
4483 /**
4484 * pevent_parse_event - parse the event format
4485 * @pevent: the handle to the pevent
4486 * @buf: the buffer storing the event format string
4487 * @size: the size of @buf
4488 * @sys: the system the event belongs to
4489 *
4490 * This parses the event format and creates an event structure
4491 * to quickly parse raw data for a given event.
4492 *
4493 * These files currently come from:
4494 *
4495 * /sys/kernel/debug/tracing/events/.../.../format
4496 */
4497 int pevent_parse_event(struct pevent *pevent,
4498 const char *buf, unsigned long size,
4499 const char *sys)
4500 {
4501 struct event_format *event;
4502 int ret;
4503
4504 init_input_buf(buf, size);
4505
4506 event = alloc_event();
4507 if (!event)
4508 return -ENOMEM;
4509
4510 event->name = event_read_name();
4511 if (!event->name) {
4512 /* Bad event? */
4513 free(event);
4514 return -1;
4515 }
4516
4517 if (strcmp(sys, "ftrace") == 0) {
4518
4519 event->flags |= EVENT_FL_ISFTRACE;
4520
4521 if (strcmp(event->name, "bprint") == 0)
4522 event->flags |= EVENT_FL_ISBPRINT;
4523 }
4524
4525 event->id = event_read_id();
4526 if (event->id < 0)
4527 die("failed to read event id");
4528
4529 event->system = strdup(sys);
4530
4531 /* Add pevent to event so that it can be referenced */
4532 event->pevent = pevent;
4533
4534 ret = event_read_format(event);
4535 if (ret < 0) {
4536 do_warning("failed to read event format for %s", event->name);
4537 goto event_failed;
4538 }
4539
4540 /*
4541 * If the event has an override, don't print warnings if the event
4542 * print format fails to parse.
4543 */
4544 if (find_event_handle(pevent, event))
4545 show_warning = 0;
4546
4547 ret = event_read_print(event);
4548 if (ret < 0) {
4549 do_warning("failed to read event print fmt for %s",
4550 event->name);
4551 show_warning = 1;
4552 goto event_failed;
4553 }
4554 show_warning = 1;
4555
4556 add_event(pevent, event);
4557
4558 if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
4559 struct format_field *field;
4560 struct print_arg *arg, **list;
4561
4562 /* old ftrace had no args */
4563
4564 list = &event->print_fmt.args;
4565 for (field = event->format.fields; field; field = field->next) {
4566 arg = alloc_arg();
4567 *list = arg;
4568 list = &arg->next;
4569 arg->type = PRINT_FIELD;
4570 arg->field.name = strdup(field->name);
4571 arg->field.field = field;
4572 }
4573 return 0;
4574 }
4575
4576 #define PRINT_ARGS 0
4577 if (PRINT_ARGS && event->print_fmt.args)
4578 print_args(event->print_fmt.args);
4579
4580 return 0;
4581
4582 event_failed:
4583 event->flags |= EVENT_FL_FAILED;
4584 /* still add it even if it failed */
4585 add_event(pevent, event);
4586 return -1;
4587 }
4588
4589 int get_field_val(struct trace_seq *s, struct format_field *field,
4590 const char *name, struct record *record,
4591 unsigned long long *val, int err)
4592 {
4593 if (!field) {
4594 if (err)
4595 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4596 return -1;
4597 }
4598
4599 if (pevent_read_number_field(field, record->data, val)) {
4600 if (err)
4601 trace_seq_printf(s, " %s=INVALID", name);
4602 return -1;
4603 }
4604
4605 return 0;
4606 }
4607
4608 /**
4609 * pevent_get_field_raw - return the raw pointer into the data field
4610 * @s: The seq to print to on error
4611 * @event: the event that the field is for
4612 * @name: The name of the field
4613 * @record: The record with the field name.
4614 * @len: place to store the field length.
4615 * @err: print default error if failed.
4616 *
4617 * Returns a pointer into record->data of the field and places
4618 * the length of the field in @len.
4619 *
4620 * On failure, it returns NULL.
4621 */
4622 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
4623 const char *name, struct record *record,
4624 int *len, int err)
4625 {
4626 struct format_field *field;
4627 void *data = record->data;
4628 unsigned offset;
4629 int dummy;
4630
4631 if (!event)
4632 return NULL;
4633
4634 field = pevent_find_field(event, name);
4635
4636 if (!field) {
4637 if (err)
4638 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4639 return NULL;
4640 }
4641
4642 /* Allow @len to be NULL */
4643 if (!len)
4644 len = &dummy;
4645
4646 offset = field->offset;
4647 if (field->flags & FIELD_IS_DYNAMIC) {
4648 offset = pevent_read_number(event->pevent,
4649 data + offset, field->size);
4650 *len = offset >> 16;
4651 offset &= 0xffff;
4652 } else
4653 *len = field->size;
4654
4655 return data + offset;
4656 }
4657
4658 /**
4659 * pevent_get_field_val - find a field and return its value
4660 * @s: The seq to print to on error
4661 * @event: the event that the field is for
4662 * @name: The name of the field
4663 * @record: The record with the field name.
4664 * @val: place to store the value of the field.
4665 * @err: print default error if failed.
4666 *
4667 * Returns 0 on success -1 on field not found.
4668 */
4669 int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
4670 const char *name, struct record *record,
4671 unsigned long long *val, int err)
4672 {
4673 struct format_field *field;
4674
4675 if (!event)
4676 return -1;
4677
4678 field = pevent_find_field(event, name);
4679
4680 return get_field_val(s, field, name, record, val, err);
4681 }
4682
4683 /**
4684 * pevent_get_common_field_val - find a common field and return its value
4685 * @s: The seq to print to on error
4686 * @event: the event that the field is for
4687 * @name: The name of the field
4688 * @record: The record with the field name.
4689 * @val: place to store the value of the field.
4690 * @err: print default error if failed.
4691 *
4692 * Returns 0 on success -1 on field not found.
4693 */
4694 int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
4695 const char *name, struct record *record,
4696 unsigned long long *val, int err)
4697 {
4698 struct format_field *field;
4699
4700 if (!event)
4701 return -1;
4702
4703 field = pevent_find_common_field(event, name);
4704
4705 return get_field_val(s, field, name, record, val, err);
4706 }
4707
4708 /**
4709 * pevent_get_any_field_val - find a any field and return its value
4710 * @s: The seq to print to on error
4711 * @event: the event that the field is for
4712 * @name: The name of the field
4713 * @record: The record with the field name.
4714 * @val: place to store the value of the field.
4715 * @err: print default error if failed.
4716 *
4717 * Returns 0 on success -1 on field not found.
4718 */
4719 int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
4720 const char *name, struct record *record,
4721 unsigned long long *val, int err)
4722 {
4723 struct format_field *field;
4724
4725 if (!event)
4726 return -1;
4727
4728 field = pevent_find_any_field(event, name);
4729
4730 return get_field_val(s, field, name, record, val, err);
4731 }
4732
4733 /**
4734 * pevent_print_num_field - print a field and a format
4735 * @s: The seq to print to
4736 * @fmt: The printf format to print the field with.
4737 * @event: the event that the field is for
4738 * @name: The name of the field
4739 * @record: The record with the field name.
4740 * @err: print default error if failed.
4741 *
4742 * Returns: 0 on success, -1 field not fould, or 1 if buffer is full.
4743 */
4744 int pevent_print_num_field(struct trace_seq *s, const char *fmt,
4745 struct event_format *event, const char *name,
4746 struct record *record, int err)
4747 {
4748 struct format_field *field = pevent_find_field(event, name);
4749 unsigned long long val;
4750
4751 if (!field)
4752 goto failed;
4753
4754 if (pevent_read_number_field(field, record->data, &val))
4755 goto failed;
4756
4757 return trace_seq_printf(s, fmt, val);
4758
4759 failed:
4760 if (err)
4761 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
4762 return -1;
4763 }
4764
4765 static void free_func_handle(struct pevent_function_handler *func)
4766 {
4767 struct pevent_func_params *params;
4768
4769 free(func->name);
4770
4771 while (func->params) {
4772 params = func->params;
4773 func->params = params->next;
4774 free(params);
4775 }
4776
4777 free(func);
4778 }
4779
4780 /**
4781 * pevent_register_print_function - register a helper function
4782 * @pevent: the handle to the pevent
4783 * @func: the function to process the helper function
4784 * @name: the name of the helper function
4785 * @parameters: A list of enum pevent_func_arg_type
4786 *
4787 * Some events may have helper functions in the print format arguments.
4788 * This allows a plugin to dynmically create a way to process one
4789 * of these functions.
4790 *
4791 * The @parameters is a variable list of pevent_func_arg_type enums that
4792 * must end with PEVENT_FUNC_ARG_VOID.
4793 */
4794 int pevent_register_print_function(struct pevent *pevent,
4795 pevent_func_handler func,
4796 enum pevent_func_arg_type ret_type,
4797 char *name, ...)
4798 {
4799 struct pevent_function_handler *func_handle;
4800 struct pevent_func_params **next_param;
4801 struct pevent_func_params *param;
4802 enum pevent_func_arg_type type;
4803 va_list ap;
4804
4805 func_handle = find_func_handler(pevent, name);
4806 if (func_handle) {
4807 /*
4808 * This is most like caused by the users own
4809 * plugins updating the function. This overrides the
4810 * system defaults.
4811 */
4812 pr_stat("override of function helper '%s'", name);
4813 remove_func_handler(pevent, name);
4814 }
4815
4816 func_handle = malloc_or_die(sizeof(*func_handle));
4817 memset(func_handle, 0, sizeof(*func_handle));
4818
4819 func_handle->ret_type = ret_type;
4820 func_handle->name = strdup(name);
4821 func_handle->func = func;
4822 if (!func_handle->name)
4823 die("Failed to allocate function name");
4824
4825 next_param = &(func_handle->params);
4826 va_start(ap, name);
4827 for (;;) {
4828 type = va_arg(ap, enum pevent_func_arg_type);
4829 if (type == PEVENT_FUNC_ARG_VOID)
4830 break;
4831
4832 if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
4833 warning("Invalid argument type %d", type);
4834 goto out_free;
4835 }
4836
4837 param = malloc_or_die(sizeof(*param));
4838 param->type = type;
4839 param->next = NULL;
4840
4841 *next_param = param;
4842 next_param = &(param->next);
4843
4844 func_handle->nr_args++;
4845 }
4846 va_end(ap);
4847
4848 func_handle->next = pevent->func_handlers;
4849 pevent->func_handlers = func_handle;
4850
4851 return 0;
4852 out_free:
4853 va_end(ap);
4854 free_func_handle(func_handle);
4855 return -1;
4856 }
4857
4858 /**
4859 * pevent_register_event_handle - register a way to parse an event
4860 * @pevent: the handle to the pevent
4861 * @id: the id of the event to register
4862 * @sys_name: the system name the event belongs to
4863 * @event_name: the name of the event
4864 * @func: the function to call to parse the event information
4865 *
4866 * This function allows a developer to override the parsing of
4867 * a given event. If for some reason the default print format
4868 * is not sufficient, this function will register a function
4869 * for an event to be used to parse the data instead.
4870 *
4871 * If @id is >= 0, then it is used to find the event.
4872 * else @sys_name and @event_name are used.
4873 */
4874 int pevent_register_event_handler(struct pevent *pevent,
4875 int id, char *sys_name, char *event_name,
4876 pevent_event_handler_func func,
4877 void *context)
4878 {
4879 struct event_format *event;
4880 struct event_handler *handle;
4881
4882 if (id >= 0) {
4883 /* search by id */
4884 event = pevent_find_event(pevent, id);
4885 if (!event)
4886 goto not_found;
4887 if (event_name && (strcmp(event_name, event->name) != 0))
4888 goto not_found;
4889 if (sys_name && (strcmp(sys_name, event->system) != 0))
4890 goto not_found;
4891 } else {
4892 event = pevent_find_event_by_name(pevent, sys_name, event_name);
4893 if (!event)
4894 goto not_found;
4895 }
4896
4897 pr_stat("overriding event (%d) %s:%s with new print handler",
4898 event->id, event->system, event->name);
4899
4900 event->handler = func;
4901 event->context = context;
4902 return 0;
4903
4904 not_found:
4905 /* Save for later use. */
4906 handle = malloc_or_die(sizeof(*handle));
4907 memset(handle, 0, sizeof(*handle));
4908 handle->id = id;
4909 if (event_name)
4910 handle->event_name = strdup(event_name);
4911 if (sys_name)
4912 handle->sys_name = strdup(sys_name);
4913
4914 handle->func = func;
4915 handle->next = pevent->handlers;
4916 pevent->handlers = handle;
4917 handle->context = context;
4918
4919 return -1;
4920 }
4921
4922 /**
4923 * pevent_alloc - create a pevent handle
4924 */
4925 struct pevent *pevent_alloc(void)
4926 {
4927 struct pevent *pevent;
4928
4929 pevent = malloc(sizeof(*pevent));
4930 if (!pevent)
4931 return NULL;
4932 memset(pevent, 0, sizeof(*pevent));
4933 pevent->ref_count = 1;
4934
4935 return pevent;
4936 }
4937
4938 void pevent_ref(struct pevent *pevent)
4939 {
4940 pevent->ref_count++;
4941 }
4942
4943 static void free_format_fields(struct format_field *field)
4944 {
4945 struct format_field *next;
4946
4947 while (field) {
4948 next = field->next;
4949 free(field->type);
4950 free(field->name);
4951 free(field);
4952 field = next;
4953 }
4954 }
4955
4956 static void free_formats(struct format *format)
4957 {
4958 free_format_fields(format->common_fields);
4959 free_format_fields(format->fields);
4960 }
4961
4962 static void free_event(struct event_format *event)
4963 {
4964 free(event->name);
4965 free(event->system);
4966
4967 free_formats(&event->format);
4968
4969 free(event->print_fmt.format);
4970 free_args(event->print_fmt.args);
4971
4972 free(event);
4973 }
4974
4975 /**
4976 * pevent_free - free a pevent handle
4977 * @pevent: the pevent handle to free
4978 */
4979 void pevent_free(struct pevent *pevent)
4980 {
4981 struct cmdline_list *cmdlist, *cmdnext;
4982 struct func_list *funclist, *funcnext;
4983 struct printk_list *printklist, *printknext;
4984 struct pevent_function_handler *func_handler;
4985 struct event_handler *handle;
4986 int i;
4987
4988 if (!pevent)
4989 return;
4990
4991 cmdlist = pevent->cmdlist;
4992 funclist = pevent->funclist;
4993 printklist = pevent->printklist;
4994
4995 pevent->ref_count--;
4996 if (pevent->ref_count)
4997 return;
4998
4999 if (pevent->cmdlines) {
5000 for (i = 0; i < pevent->cmdline_count; i++)
5001 free(pevent->cmdlines[i].comm);
5002 free(pevent->cmdlines);
5003 }
5004
5005 while (cmdlist) {
5006 cmdnext = cmdlist->next;
5007 free(cmdlist->comm);
5008 free(cmdlist);
5009 cmdlist = cmdnext;
5010 }
5011
5012 if (pevent->func_map) {
5013 for (i = 0; i < pevent->func_count; i++) {
5014 free(pevent->func_map[i].func);
5015 free(pevent->func_map[i].mod);
5016 }
5017 free(pevent->func_map);
5018 }
5019
5020 while (funclist) {
5021 funcnext = funclist->next;
5022 free(funclist->func);
5023 free(funclist->mod);
5024 free(funclist);
5025 funclist = funcnext;
5026 }
5027
5028 while (pevent->func_handlers) {
5029 func_handler = pevent->func_handlers;
5030 pevent->func_handlers = func_handler->next;
5031 free_func_handle(func_handler);
5032 }
5033
5034 if (pevent->printk_map) {
5035 for (i = 0; i < pevent->printk_count; i++)
5036 free(pevent->printk_map[i].printk);
5037 free(pevent->printk_map);
5038 }
5039
5040 while (printklist) {
5041 printknext = printklist->next;
5042 free(printklist->printk);
5043 free(printklist);
5044 printklist = printknext;
5045 }
5046
5047 for (i = 0; i < pevent->nr_events; i++)
5048 free_event(pevent->events[i]);
5049
5050 while (pevent->handlers) {
5051 handle = pevent->handlers;
5052 pevent->handlers = handle->next;
5053 free_handler(handle);
5054 }
5055
5056 free(pevent->events);
5057 free(pevent->sort_events);
5058
5059 free(pevent);
5060 }
5061
5062 void pevent_unref(struct pevent *pevent)
5063 {
5064 pevent_free(pevent);
5065 }
Linux kernel - Deliverables
This page took 0.137989 seconds and 4 git commands to generate.