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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
38static const char *input_buf;
39static unsigned long long input_buf_ptr;
40static unsigned long long input_buf_siz;
41
42static int is_flag_field;
43static int is_symbolic_field;
44
45static 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
53static 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
60const char *pevent_get_input_buf(void)
61{
62 return input_buf;
63}
64
65unsigned long long pevent_get_input_buf_ptr(void)
66{
67 return input_buf_ptr;
68}
69
70struct 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
79struct pevent_func_params {
80 struct pevent_func_params *next;
81 enum pevent_func_arg_type type;
82};
83
84struct 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
93static unsigned long long
94process_defined_func(struct trace_seq *s, void *data, int size,
95 struct event_format *event, struct print_arg *arg);
96
97static 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 */
107void pevent_buffer_init(const char *buf, unsigned long long size)
108{
109 init_input_buf(buf, size);
110}
111
112void breakpoint(void)
113{
114 static int x;
115 x++;
116}
117
118struct 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
130struct cmdline {
131 char *comm;
132 int pid;
133};
134
135static 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
148struct cmdline_list {
149 struct cmdline_list *next;
150 char *comm;
151 int pid;
152};
153
154static 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
181static 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 */
210int 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 */
236static 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 */
284int 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
304struct func_map {
305 unsigned long long addr;
306 char *func;
307 char *mod;
308};
309
310struct func_list {
311 struct func_list *next;
312 unsigned long long addr;
313 char *func;
314 char *mod;
315};
316
317static 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 */
334static 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
351static 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
387static struct func_map *
388find_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 */
413const 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 */
433unsigned long long
434pevent_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 */
455int 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 */
483void 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
501struct printk_map {
502 unsigned long long addr;
503 char *printk;
504};
505
506struct printk_list {
507 struct printk_list *next;
508 unsigned long long addr;
509 char *printk;
510};
511
512static 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
525static 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
552static struct printk_map *
553find_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 */
578int 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 */
601void 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
615static 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
625static 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
653static 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
664static 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
677static 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
732static 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
752static 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
760static 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 */
773int pevent_peek_char(void)
774{
775 return __peek_char();
776}
777
778static enum event_type force_token(const char *str, char **tok);
779
780static 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
967static 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
991static void free_token(char *tok)
992{
993 if (tok)
994 free(tok);
995}
996
997static 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 */
1023enum 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 */
1032void pevent_free_token(char *token)
1033{
1034 free_token(token);
1035}
1036
1037/* no newline */
1038static 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
1055static 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
1065static 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
1082static 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
1093static int read_expect_type(enum event_type expect, char **tok)
1094{
1095 return __read_expect_type(expect, tok, 1);
1096}
1097
1098static 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
1117static int read_expected(enum event_type expect, const char *str)
1118{
1119 return __read_expected(expect, str, 1);
1120}
1121
1122static int read_expected_item(enum event_type expect, const char *str)
1123{
1124 return __read_expected(expect, str, 0);
1125}
1126
1127static 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
1147static 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
1170static 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
1180static 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
1188static 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
1197static 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
1434fail:
1435 free_token(token);
1436fail_expect:
1437 if (field) {
1438 free(field->type);
1439 free(field->name);
1440 free(field);
1441 }
1442 return -1;
1443}
1444
1445static int event_read_format(struct event_format *event)
1446{
1447 char *token;
1448 int ret;
1449
1450 if (read_expected_item(EVENT_ITEM, "format") < 0)
1451 return -1;
1452
1453 if (read_expected(EVENT_OP, ":") < 0)
1454 return -1;
1455
1456 if (read_expect_type(EVENT_NEWLINE, &token))
1457 goto fail;
1458 free_token(token);
1459
1460 ret = event_read_fields(event, &event->format.common_fields);
1461 if (ret < 0)
1462 return ret;
1463 event->format.nr_common = ret;
1464
1465 ret = event_read_fields(event, &event->format.fields);
1466 if (ret < 0)
1467 return ret;
1468 event->format.nr_fields = ret;
1469
1470 return 0;
1471
1472 fail:
1473 free_token(token);
1474 return -1;
1475}
1476
1477static enum event_type
1478process_arg_token(struct event_format *event, struct print_arg *arg,
1479 char **tok, enum event_type type);
1480
1481static enum event_type
1482process_arg(struct event_format *event, struct print_arg *arg, char **tok)
1483{
1484 enum event_type type;
1485 char *token;
1486
1487 type = read_token(&token);
1488 *tok = token;
1489
1490 return process_arg_token(event, arg, tok, type);
1491}
1492
1493static enum event_type
1494process_op(struct event_format *event, struct print_arg *arg, char **tok);
1495
1496static enum event_type
1497process_cond(struct event_format *event, struct print_arg *top, char **tok)
1498{
1499 struct print_arg *arg, *left, *right;
1500 enum event_type type;
1501 char *token = NULL;
1502
1503 arg = alloc_arg();
1504 left = alloc_arg();
1505 right = alloc_arg();
1506
1507 arg->type = PRINT_OP;
1508 arg->op.left = left;
1509 arg->op.right = right;
1510
1511 *tok = NULL;
1512 type = process_arg(event, left, &token);
1513
1514 again:
1515 /* Handle other operations in the arguments */
1516 if (type == EVENT_OP && strcmp(token, ":") != 0) {
1517 type = process_op(event, left, &token);
1518 goto again;
1519 }
1520
1521 if (test_type_token(type, token, EVENT_OP, ":"))
1522 goto out_free;
1523
1524 arg->op.op = token;
1525
1526 type = process_arg(event, right, &token);
1527
1528 top->op.right = arg;
1529
1530 *tok = token;
1531 return type;
1532
1533out_free:
1534 /* Top may point to itself */
1535 top->op.right = NULL;
1536 free_token(token);
1537 free_arg(arg);
1538 return EVENT_ERROR;
1539}
1540
1541static enum event_type
1542process_array(struct event_format *event, struct print_arg *top, char **tok)
1543{
1544 struct print_arg *arg;
1545 enum event_type type;
1546 char *token = NULL;
1547
1548 arg = alloc_arg();
1549
1550 *tok = NULL;
1551 type = process_arg(event, arg, &token);
1552 if (test_type_token(type, token, EVENT_OP, "]"))
1553 goto out_free;
1554
1555 top->op.right = arg;
1556
1557 free_token(token);
1558 type = read_token_item(&token);
1559 *tok = token;
1560
1561 return type;
1562
1563out_free:
1564 free_token(*tok);
1565 *tok = NULL;
1566 free_arg(arg);
1567 return EVENT_ERROR;
1568}
1569
1570static int get_op_prio(char *op)
1571{
1572 if (!op[1]) {
1573 switch (op[0]) {
1574 case '~':
1575 case '!':
1576 return 4;
1577 case '*':
1578 case '/':
1579 case '%':
1580 return 6;
1581 case '+':
1582 case '-':
1583 return 7;
1584 /* '>>' and '<<' are 8 */
1585 case '<':
1586 case '>':
1587 return 9;
1588 /* '==' and '!=' are 10 */
1589 case '&':
1590 return 11;
1591 case '^':
1592 return 12;
1593 case '|':
1594 return 13;
1595 case '?':
1596 return 16;
1597 default:
1598 do_warning("unknown op '%c'", op[0]);
1599 return -1;
1600 }
1601 } else {
1602 if (strcmp(op, "++") == 0 ||
1603 strcmp(op, "--") == 0) {
1604 return 3;
1605 } else if (strcmp(op, ">>") == 0 ||
1606 strcmp(op, "<<") == 0) {
1607 return 8;
1608 } else if (strcmp(op, ">=") == 0 ||
1609 strcmp(op, "<=") == 0) {
1610 return 9;
1611 } else if (strcmp(op, "==") == 0 ||
1612 strcmp(op, "!=") == 0) {
1613 return 10;
1614 } else if (strcmp(op, "&&") == 0) {
1615 return 14;
1616 } else if (strcmp(op, "||") == 0) {
1617 return 15;
1618 } else {
1619 do_warning("unknown op '%s'", op);
1620 return -1;
1621 }
1622 }
1623}
1624
1625static int set_op_prio(struct print_arg *arg)
1626{
1627
1628 /* single ops are the greatest */
1629 if (!arg->op.left || arg->op.left->type == PRINT_NULL)
1630 arg->op.prio = 0;
1631 else
1632 arg->op.prio = get_op_prio(arg->op.op);
1633
1634 return arg->op.prio;
1635}
1636
1637/* Note, *tok does not get freed, but will most likely be saved */
1638static enum event_type
1639process_op(struct event_format *event, struct print_arg *arg, char **tok)
1640{
1641 struct print_arg *left, *right = NULL;
1642 enum event_type type;
1643 char *token;
1644
1645 /* the op is passed in via tok */
1646 token = *tok;
1647
1648 if (arg->type == PRINT_OP && !arg->op.left) {
1649 /* handle single op */
1650 if (token[1]) {
1651 die("bad op token %s", token);
1652 goto out_free;
1653 }
1654 switch (token[0]) {
1655 case '~':
1656 case '!':
1657 case '+':
1658 case '-':
1659 break;
1660 default:
1661 do_warning("bad op token %s", token);
1662 goto out_free;
1663
1664 }
1665
1666 /* make an empty left */
1667 left = alloc_arg();
1668 left->type = PRINT_NULL;
1669 arg->op.left = left;
1670
1671 right = alloc_arg();
1672 arg->op.right = right;
1673
1674 /* do not free the token, it belongs to an op */
1675 *tok = NULL;
1676 type = process_arg(event, right, tok);
1677
1678 } else if (strcmp(token, "?") == 0) {
1679
1680 left = alloc_arg();
1681 /* copy the top arg to the left */
1682 *left = *arg;
1683
1684 arg->type = PRINT_OP;
1685 arg->op.op = token;
1686 arg->op.left = left;
1687 arg->op.prio = 0;
1688
1689 type = process_cond(event, arg, tok);
1690
1691 } else if (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 strcmp(token, ">") == 0 ||
1704 strcmp(token, "==") == 0 ||
1705 strcmp(token, "!=") == 0) {
1706
1707 left = alloc_arg();
1708
1709 /* copy the top arg to the left */
1710 *left = *arg;
1711
1712 arg->type = PRINT_OP;
1713 arg->op.op = token;
1714 arg->op.left = left;
1715
1716 if (set_op_prio(arg) == -1) {
1717 event->flags |= EVENT_FL_FAILED;
1718 /* arg->op.op (= token) will be freed at out_free */
1719 arg->op.op = NULL;
1720 goto out_free;
1721 }
1722
1723 type = read_token_item(&token);
1724 *tok = token;
1725
1726 /* could just be a type pointer */
1727 if ((strcmp(arg->op.op, "*") == 0) &&
1728 type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1729 if (left->type != PRINT_ATOM)
1730 die("bad pointer type");
1731 left->atom.atom = realloc(left->atom.atom,
1732 strlen(left->atom.atom) + 3);
1733 strcat(left->atom.atom, " *");
1734 free(arg->op.op);
1735 *arg = *left;
1736 free(left);
1737
1738 return type;
1739 }
1740
1741 right = alloc_arg();
1742 type = process_arg_token(event, right, tok, type);
1743 arg->op.right = right;
1744
1745 } else if (strcmp(token, "[") == 0) {
1746
1747 left = alloc_arg();
1748 *left = *arg;
1749
1750 arg->type = PRINT_OP;
1751 arg->op.op = token;
1752 arg->op.left = left;
1753
1754 arg->op.prio = 0;
1755
1756 type = process_array(event, arg, tok);
1757
1758 } else {
1759 do_warning("unknown op '%s'", token);
1760 event->flags |= EVENT_FL_FAILED;
1761 /* the arg is now the left side */
1762 goto out_free;
1763 }
1764
1765 if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
1766 int prio;
1767
1768 /* higher prios need to be closer to the root */
1769 prio = get_op_prio(*tok);
1770
1771 if (prio > arg->op.prio)
1772 return process_op(event, arg, tok);
1773
1774 return process_op(event, right, tok);
1775 }
1776
1777 return type;
1778
1779 out_free:
1780 free_token(token);
1781 *tok = NULL;
1782 return EVENT_ERROR;
1783}
1784
1785static enum event_type
1786process_entry(struct event_format *event __unused, struct print_arg *arg,
1787 char **tok)
1788{
1789 enum event_type type;
1790 char *field;
1791 char *token;
1792
1793 if (read_expected(EVENT_OP, "->") < 0)
1794 goto out_err;
1795
1796 if (read_expect_type(EVENT_ITEM, &token) < 0)
1797 goto out_free;
1798 field = token;
1799
1800 arg->type = PRINT_FIELD;
1801 arg->field.name = field;
1802
1803 if (is_flag_field) {
1804 arg->field.field = pevent_find_any_field(event, arg->field.name);
1805 arg->field.field->flags |= FIELD_IS_FLAG;
1806 is_flag_field = 0;
1807 } else if (is_symbolic_field) {
1808 arg->field.field = pevent_find_any_field(event, arg->field.name);
1809 arg->field.field->flags |= FIELD_IS_SYMBOLIC;
1810 is_symbolic_field = 0;
1811 }
1812
1813 type = read_token(&token);
1814 *tok = token;
1815
1816 return type;
1817
1818 out_free:
1819 free_token(token);
1820 out_err:
1821 *tok = NULL;
1822 return EVENT_ERROR;
1823}
1824
1825static char *arg_eval (struct print_arg *arg);
1826
1827static unsigned long long
1828eval_type_str(unsigned long long val, const char *type, int pointer)
1829{
1830 int sign = 0;
1831 char *ref;
1832 int len;
1833
1834 len = strlen(type);
1835
1836 if (pointer) {
1837
1838 if (type[len-1] != '*') {
1839 do_warning("pointer expected with non pointer type");
1840 return val;
1841 }
1842
1843 ref = malloc_or_die(len);
1844 memcpy(ref, type, len);
1845
1846 /* chop off the " *" */
1847 ref[len - 2] = 0;
1848
1849 val = eval_type_str(val, ref, 0);
1850 free(ref);
1851 return val;
1852 }
1853
1854 /* check if this is a pointer */
1855 if (type[len - 1] == '*')
1856 return val;
1857
1858 /* Try to figure out the arg size*/
1859 if (strncmp(type, "struct", 6) == 0)
1860 /* all bets off */
1861 return val;
1862
1863 if (strcmp(type, "u8") == 0)
1864 return val & 0xff;
1865
1866 if (strcmp(type, "u16") == 0)
1867 return val & 0xffff;
1868
1869 if (strcmp(type, "u32") == 0)
1870 return val & 0xffffffff;
1871
1872 if (strcmp(type, "u64") == 0 ||
1873 strcmp(type, "s64"))
1874 return val;
1875
1876 if (strcmp(type, "s8") == 0)
1877 return (unsigned long long)(char)val & 0xff;
1878
1879 if (strcmp(type, "s16") == 0)
1880 return (unsigned long long)(short)val & 0xffff;
1881
1882 if (strcmp(type, "s32") == 0)
1883 return (unsigned long long)(int)val & 0xffffffff;
1884
1885 if (strncmp(type, "unsigned ", 9) == 0) {
1886 sign = 0;
1887 type += 9;
1888 }
1889
1890 if (strcmp(type, "char") == 0) {
1891 if (sign)
1892 return (unsigned long long)(char)val & 0xff;
1893 else
1894 return val & 0xff;
1895 }
1896
1897 if (strcmp(type, "short") == 0) {
1898 if (sign)
1899 return (unsigned long long)(short)val & 0xffff;
1900 else
1901 return val & 0xffff;
1902 }
1903
1904 if (strcmp(type, "int") == 0) {
1905 if (sign)
1906 return (unsigned long long)(int)val & 0xffffffff;
1907 else
1908 return val & 0xffffffff;
1909 }
1910
1911 return val;
1912}
1913
1914/*
1915 * Try to figure out the type.
1916 */
1917static unsigned long long
1918eval_type(unsigned long long val, struct print_arg *arg, int pointer)
1919{
1920 if (arg->type != PRINT_TYPE)
1921 die("expected type argument");
1922
1923 return eval_type_str(val, arg->typecast.type, pointer);
1924}
1925
1926static int arg_num_eval(struct print_arg *arg, long long *val)
1927{
1928 long long left, right;
1929 int ret = 1;
1930
1931 switch (arg->type) {
1932 case PRINT_ATOM:
1933 *val = strtoll(arg->atom.atom, NULL, 0);
1934 break;
1935 case PRINT_TYPE:
1936 ret = arg_num_eval(arg->typecast.item, val);
1937 if (!ret)
1938 break;
1939 *val = eval_type(*val, arg, 0);
1940 break;
1941 case PRINT_OP:
1942 switch (arg->op.op[0]) {
1943 case '|':
1944 ret = arg_num_eval(arg->op.left, &left);
1945 if (!ret)
1946 break;
1947 ret = arg_num_eval(arg->op.right, &right);
1948 if (!ret)
1949 break;
1950 if (arg->op.op[1])
1951 *val = left || right;
1952 else
1953 *val = left | right;
1954 break;
1955 case '&':
1956 ret = arg_num_eval(arg->op.left, &left);
1957 if (!ret)
1958 break;
1959 ret = arg_num_eval(arg->op.right, &right);
1960 if (!ret)
1961 break;
1962 if (arg->op.op[1])
1963 *val = left && right;
1964 else
1965 *val = left & right;
1966 break;
1967 case '<':
1968 ret = arg_num_eval(arg->op.left, &left);
1969 if (!ret)
1970 break;
1971 ret = arg_num_eval(arg->op.right, &right);
1972 if (!ret)
1973 break;
1974 switch (arg->op.op[1]) {
1975 case 0:
1976 *val = left < right;
1977 break;
1978 case '<':
1979 *val = left << right;
1980 break;
1981 case '=':
1982 *val = left <= right;
1983 break;
1984 default:
1985 do_warning("unknown op '%s'", arg->op.op);
1986 ret = 0;
1987 }
1988 break;
1989 case '>':
1990 ret = arg_num_eval(arg->op.left, &left);
1991 if (!ret)
1992 break;
1993 ret = arg_num_eval(arg->op.right, &right);
1994 if (!ret)
1995 break;
1996 switch (arg->op.op[1]) {
1997 case 0:
1998 *val = left > right;
1999 break;
2000 case '>':
2001 *val = left >> right;
2002 break;
2003 case '=':
2004 *val = left >= right;
2005 break;
2006 default:
2007 do_warning("unknown op '%s'", arg->op.op);
2008 ret = 0;
2009 }
2010 break;
2011 case '=':
2012 ret = arg_num_eval(arg->op.left, &left);
2013 if (!ret)
2014 break;
2015 ret = arg_num_eval(arg->op.right, &right);
2016 if (!ret)
2017 break;
2018
2019 if (arg->op.op[1] != '=') {
2020 do_warning("unknown op '%s'", arg->op.op);
2021 ret = 0;
2022 } else
2023 *val = left == right;
2024 break;
2025 case '!':
2026 ret = arg_num_eval(arg->op.left, &left);
2027 if (!ret)
2028 break;
2029 ret = arg_num_eval(arg->op.right, &right);
2030 if (!ret)
2031 break;
2032
2033 switch (arg->op.op[1]) {
2034 case '=':
2035 *val = left != right;
2036 break;
2037 default:
2038 do_warning("unknown op '%s'", arg->op.op);
2039 ret = 0;
2040 }
2041 break;
2042 case '-':
2043 /* check for negative */
2044 if (arg->op.left->type == PRINT_NULL)
2045 left = 0;
2046 else
2047 ret = arg_num_eval(arg->op.left, &left);
2048 if (!ret)
2049 break;
2050 ret = arg_num_eval(arg->op.right, &right);
2051 if (!ret)
2052 break;
2053 *val = left - right;
2054 break;
2055 case '+':
2056 if (arg->op.left->type == PRINT_NULL)
2057 left = 0;
2058 else
2059 ret = arg_num_eval(arg->op.left, &left);
2060 if (!ret)
2061 break;
2062 ret = arg_num_eval(arg->op.right, &right);
2063 if (!ret)
2064 break;
2065 *val = left + right;
2066 break;
2067 default:
2068 do_warning("unknown op '%s'", arg->op.op);
2069 ret = 0;
2070 }
2071 break;
2072
2073 case PRINT_NULL:
2074 case PRINT_FIELD ... PRINT_SYMBOL:
2075 case PRINT_STRING:
2076 case PRINT_BSTRING:
2077 default:
2078 do_warning("invalid eval type %d", arg->type);
2079 ret = 0;
2080
2081 }
2082 return ret;
2083}
2084
2085static char *arg_eval (struct print_arg *arg)
2086{
2087 long long val;
2088 static char buf[20];
2089
2090 switch (arg->type) {
2091 case PRINT_ATOM:
2092 return arg->atom.atom;
2093 case PRINT_TYPE:
2094 return arg_eval(arg->typecast.item);
2095 case PRINT_OP:
2096 if (!arg_num_eval(arg, &val))
2097 break;
2098 sprintf(buf, "%lld", val);
2099 return buf;
2100
2101 case PRINT_NULL:
2102 case PRINT_FIELD ... PRINT_SYMBOL:
2103 case PRINT_STRING:
2104 case PRINT_BSTRING:
2105 default:
2106 die("invalid eval type %d", arg->type);
2107 break;
2108 }
2109
2110 return NULL;
2111}
2112
2113static enum event_type
2114process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2115{
2116 enum event_type type;
2117 struct print_arg *arg = NULL;
2118 struct print_flag_sym *field;
2119 char *token = *tok;
2120 char *value;
2121
2122 do {
2123 free_token(token);
2124 type = read_token_item(&token);
2125 if (test_type_token(type, token, EVENT_OP, "{"))
2126 break;
2127
2128 arg = alloc_arg();
2129
2130 free_token(token);
2131 type = process_arg(event, arg, &token);
2132
2133 if (type == EVENT_OP)
2134 type = process_op(event, arg, &token);
2135
2136 if (type == EVENT_ERROR)
2137 goto out_free;
2138
2139 if (test_type_token(type, token, EVENT_DELIM, ","))
2140 goto out_free;
2141
2142 field = malloc_or_die(sizeof(*field));
2143 memset(field, 0, sizeof(*field));
2144
2145 value = arg_eval(arg);
2146 if (value == NULL)
2147 goto out_free;
2148 field->value = strdup(value);
2149
2150 free_arg(arg);
2151 arg = alloc_arg();
2152
2153 free_token(token);
2154 type = process_arg(event, arg, &token);
2155 if (test_type_token(type, token, EVENT_OP, "}"))
2156 goto out_free;
2157
2158 value = arg_eval(arg);
2159 if (value == NULL)
2160 goto out_free;
2161 field->str = strdup(value);
2162 free_arg(arg);
2163 arg = NULL;
2164
2165 *list = field;
2166 list = &field->next;
2167
2168 free_token(token);
2169 type = read_token_item(&token);
2170 } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2171
2172 *tok = token;
2173 return type;
2174
2175out_free:
2176 free_arg(arg);
2177 free_token(token);
2178 *tok = NULL;
2179
2180 return EVENT_ERROR;
2181}
2182
2183static enum event_type
2184process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2185{
2186 struct print_arg *field;
2187 enum event_type type;
2188 char *token;
2189
2190 memset(arg, 0, sizeof(*arg));
2191 arg->type = PRINT_FLAGS;
2192
2193 field = alloc_arg();
2194
2195 type = process_arg(event, field, &token);
2196
2197 /* Handle operations in the first argument */
2198 while (type == EVENT_OP)
2199 type = process_op(event, field, &token);
2200
2201 if (test_type_token(type, token, EVENT_DELIM, ","))
2202 goto out_free;
2203 free_token(token);
2204
2205 arg->flags.field = field;
2206
2207 type = read_token_item(&token);
2208 if (event_item_type(type)) {
2209 arg->flags.delim = token;
2210 type = read_token_item(&token);
2211 }
2212
2213 if (test_type_token(type, token, EVENT_DELIM, ","))
2214 goto out_free;
2215
2216 type = process_fields(event, &arg->flags.flags, &token);
2217 if (test_type_token(type, token, EVENT_DELIM, ")"))
2218 goto out_free;
2219
2220 free_token(token);
2221 type = read_token_item(tok);
2222 return type;
2223
2224 out_free:
2225 free_token(token);
2226 *tok = NULL;
2227 return EVENT_ERROR;
2228}
2229
2230static enum event_type
2231process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2232{
2233 struct print_arg *field;
2234 enum event_type type;
2235 char *token;
2236
2237 memset(arg, 0, sizeof(*arg));
2238 arg->type = PRINT_SYMBOL;
2239
2240 field = alloc_arg();
2241
2242 type = process_arg(event, field, &token);
2243 if (test_type_token(type, token, EVENT_DELIM, ","))
2244 goto out_free;
2245
2246 arg->symbol.field = field;
2247
2248 type = process_fields(event, &arg->symbol.symbols, &token);
2249 if (test_type_token(type, token, EVENT_DELIM, ")"))
2250 goto out_free;
2251
2252 free_token(token);
2253 type = read_token_item(tok);
2254 return type;
2255
2256 out_free:
2257 free_token(token);
2258 *tok = NULL;
2259 return EVENT_ERROR;
2260}
2261
2262static enum event_type
2263process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2264{
2265 struct format_field *field;
2266 enum event_type type;
2267 char *token;
2268
2269 memset(arg, 0, sizeof(*arg));
2270 arg->type = PRINT_DYNAMIC_ARRAY;
2271
2272 /*
2273 * The item within the parenthesis is another field that holds
2274 * the index into where the array starts.
2275 */
2276 type = read_token(&token);
2277 *tok = token;
2278 if (type != EVENT_ITEM)
2279 goto out_free;
2280
2281 /* Find the field */
2282
2283 field = pevent_find_field(event, token);
2284 if (!field)
2285 goto out_free;
2286
2287 arg->dynarray.field = field;
2288 arg->dynarray.index = 0;
2289
2290 if (read_expected(EVENT_DELIM, ")") < 0)
2291 goto out_free;
2292
2293 free_token(token);
2294 type = read_token_item(&token);
2295 *tok = token;
2296 if (type != EVENT_OP || strcmp(token, "[") != 0)
2297 return type;
2298
2299 free_token(token);
2300 arg = alloc_arg();
2301 type = process_arg(event, arg, &token);
2302 if (type == EVENT_ERROR)
2303 goto out_free_arg;
2304
2305 if (!test_type_token(type, token, EVENT_OP, "]"))
2306 goto out_free_arg;
2307
2308 free_token(token);
2309 type = read_token_item(tok);
2310 return type;
2311
2312 out_free_arg:
2313 free_arg(arg);
2314 out_free:
2315 free_token(token);
2316 *tok = NULL;
2317 return EVENT_ERROR;
2318}
2319
2320static enum event_type
2321process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2322{
2323 struct print_arg *item_arg;
2324 enum event_type type;
2325 char *token;
2326
2327 type = process_arg(event, arg, &token);
2328
2329 if (type == EVENT_ERROR)
2330 goto out_free;
2331
2332 if (type == EVENT_OP)
2333 type = process_op(event, arg, &token);
2334
2335 if (type == EVENT_ERROR)
2336 goto out_free;
2337
2338 if (test_type_token(type, token, EVENT_DELIM, ")"))
2339 goto out_free;
2340
2341 free_token(token);
2342 type = read_token_item(&token);
2343
2344 /*
2345 * If the next token is an item or another open paren, then
2346 * this was a typecast.
2347 */
2348 if (event_item_type(type) ||
2349 (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2350
2351 /* make this a typecast and contine */
2352
2353 /* prevous must be an atom */
2354 if (arg->type != PRINT_ATOM)
2355 die("previous needed to be PRINT_ATOM");
2356
2357 item_arg = alloc_arg();
2358
2359 arg->type = PRINT_TYPE;
2360 arg->typecast.type = arg->atom.atom;
2361 arg->typecast.item = item_arg;
2362 type = process_arg_token(event, item_arg, &token, type);
2363
2364 }
2365
2366 *tok = token;
2367 return type;
2368
2369 out_free:
2370 free_token(token);
2371 *tok = NULL;
2372 return EVENT_ERROR;
2373}
2374
2375
2376static enum event_type
2377process_str(struct event_format *event __unused, struct print_arg *arg, char **tok)
2378{
2379 enum event_type type;
2380 char *token;
2381
2382 if (read_expect_type(EVENT_ITEM, &token) < 0)
2383 goto out_free;
2384
2385 arg->type = PRINT_STRING;
2386 arg->string.string = token;
2387 arg->string.offset = -1;
2388
2389 if (read_expected(EVENT_DELIM, ")") < 0)
2390 goto out_err;
2391
2392 type = read_token(&token);
2393 *tok = token;
2394
2395 return type;
2396
2397 out_free:
2398 free_token(token);
2399 out_err:
2400 *tok = NULL;
2401 return EVENT_ERROR;
2402}
2403
2404static struct pevent_function_handler *
2405find_func_handler(struct pevent *pevent, char *func_name)
2406{
2407 struct pevent_function_handler *func;
2408
2409 for (func = pevent->func_handlers; func; func = func->next) {
2410 if (strcmp(func->name, func_name) == 0)
2411 break;
2412 }
2413
2414 return func;
2415}
2416
2417static void remove_func_handler(struct pevent *pevent, char *func_name)
2418{
2419 struct pevent_function_handler *func;
2420 struct pevent_function_handler **next;
2421
2422 next = &pevent->func_handlers;
2423 while ((func = *next)) {
2424 if (strcmp(func->name, func_name) == 0) {
2425 *next = func->next;
2426 free_func_handle(func);
2427 break;
2428 }
2429 next = &func->next;
2430 }
2431}
2432
2433static enum event_type
2434process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2435 struct print_arg *arg, char **tok)
2436{
2437 struct print_arg **next_arg;
2438 struct print_arg *farg;
2439 enum event_type type;
2440 char *token;
2441 char *test;
2442 int i;
2443
2444 arg->type = PRINT_FUNC;
2445 arg->func.func = func;
2446
2447 *tok = NULL;
2448
2449 next_arg = &(arg->func.args);
2450 for (i = 0; i < func->nr_args; i++) {
2451 farg = alloc_arg();
2452 type = process_arg(event, farg, &token);
2453 if (i < (func->nr_args - 1))
2454 test = ",";
2455 else
2456 test = ")";
2457
2458 if (test_type_token(type, token, EVENT_DELIM, test)) {
2459 free_arg(farg);
2460 free_token(token);
2461 return EVENT_ERROR;
2462 }
2463
2464 *next_arg = farg;
2465 next_arg = &(farg->next);
2466 free_token(token);
2467 }
2468
2469 type = read_token(&token);
2470 *tok = token;
2471
2472 return type;
2473}
2474
2475static enum event_type
2476process_function(struct event_format *event, struct print_arg *arg,
2477 char *token, char **tok)
2478{
2479 struct pevent_function_handler *func;
2480
2481 if (strcmp(token, "__print_flags") == 0) {
2482 free_token(token);
2483 is_flag_field = 1;
2484 return process_flags(event, arg, tok);
2485 }
2486 if (strcmp(token, "__print_symbolic") == 0) {
2487 free_token(token);
2488 is_symbolic_field = 1;
2489 return process_symbols(event, arg, tok);
2490 }
2491 if (strcmp(token, "__get_str") == 0) {
2492 free_token(token);
2493 return process_str(event, arg, tok);
2494 }
2495 if (strcmp(token, "__get_dynamic_array") == 0) {
2496 free_token(token);
2497 return process_dynamic_array(event, arg, tok);
2498 }
2499
2500 func = find_func_handler(event->pevent, token);
2501 if (func) {
2502 free_token(token);
2503 return process_func_handler(event, func, arg, tok);
2504 }
2505
2506 do_warning("function %s not defined", token);
2507 free_token(token);
2508 return EVENT_ERROR;
2509}
2510
2511static enum event_type
2512process_arg_token(struct event_format *event, struct print_arg *arg,
2513 char **tok, enum event_type type)
2514{
2515 char *token;
2516 char *atom;
2517
2518 token = *tok;
2519
2520 switch (type) {
2521 case EVENT_ITEM:
2522 if (strcmp(token, "REC") == 0) {
2523 free_token(token);
2524 type = process_entry(event, arg, &token);
2525 break;
2526 }
2527 atom = token;
2528 /* test the next token */
2529 type = read_token_item(&token);
2530
2531 /*
2532 * If the next token is a parenthesis, then this
2533 * is a function.
2534 */
2535 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
2536 free_token(token);
2537 token = NULL;
2538 /* this will free atom. */
2539 type = process_function(event, arg, atom, &token);
2540 break;
2541 }
2542 /* atoms can be more than one token long */
2543 while (type == EVENT_ITEM) {
2544 atom = realloc(atom, strlen(atom) + strlen(token) + 2);
2545 strcat(atom, " ");
2546 strcat(atom, token);
2547 free_token(token);
2548 type = read_token_item(&token);
2549 }
2550
2551 arg->type = PRINT_ATOM;
2552 arg->atom.atom = atom;
2553 break;
2554
2555 case EVENT_DQUOTE:
2556 case EVENT_SQUOTE:
2557 arg->type = PRINT_ATOM;
2558 arg->atom.atom = token;
2559 type = read_token_item(&token);
2560 break;
2561 case EVENT_DELIM:
2562 if (strcmp(token, "(") == 0) {
2563 free_token(token);
2564 type = process_paren(event, arg, &token);
2565 break;
2566 }
2567 case EVENT_OP:
2568 /* handle single ops */
2569 arg->type = PRINT_OP;
2570 arg->op.op = token;
2571 arg->op.left = NULL;
2572 type = process_op(event, arg, &token);
2573
2574 /* On error, the op is freed */
2575 if (type == EVENT_ERROR)
2576 arg->op.op = NULL;
2577
2578 /* return error type if errored */
2579 break;
2580
2581 case EVENT_ERROR ... EVENT_NEWLINE:
2582 default:
2583 die("unexpected type %d", type);
2584 }
2585 *tok = token;
2586
2587 return type;
2588}
2589
2590static int event_read_print_args(struct event_format *event, struct print_arg **list)
2591{
2592 enum event_type type = EVENT_ERROR;
2593 struct print_arg *arg;
2594 char *token;
2595 int args = 0;
2596
2597 do {
2598 if (type == EVENT_NEWLINE) {
2599 type = read_token_item(&token);
2600 continue;
2601 }
2602
2603 arg = alloc_arg();
2604
2605 type = process_arg(event, arg, &token);
2606
2607 if (type == EVENT_ERROR) {
2608 free_token(token);
2609 free_arg(arg);
2610 return -1;
2611 }
2612
2613 *list = arg;
2614 args++;
2615
2616 if (type == EVENT_OP) {
2617 type = process_op(event, arg, &token);
2618 free_token(token);
2619 if (type == EVENT_ERROR) {
2620 *list = NULL;
2621 free_arg(arg);
2622 return -1;
2623 }
2624 list = &arg->next;
2625 continue;
2626 }
2627
2628 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
2629 free_token(token);
2630 *list = arg;
2631 list = &arg->next;
2632 continue;
2633 }
2634 break;
2635 } while (type != EVENT_NONE);
2636
2637 if (type != EVENT_NONE && type != EVENT_ERROR)
2638 free_token(token);
2639
2640 return args;
2641}
2642
2643static int event_read_print(struct event_format *event)
2644{
2645 enum event_type type;
2646 char *token;
2647 int ret;
2648
2649 if (read_expected_item(EVENT_ITEM, "print") < 0)
2650 return -1;
2651
2652 if (read_expected(EVENT_ITEM, "fmt") < 0)
2653 return -1;
2654
2655 if (read_expected(EVENT_OP, ":") < 0)
2656 return -1;
2657
2658 if (read_expect_type(EVENT_DQUOTE, &token) < 0)
2659 goto fail;
2660
2661 concat:
2662 event->print_fmt.format = token;
2663 event->print_fmt.args = NULL;
2664
2665 /* ok to have no arg */
2666 type = read_token_item(&token);
2667
2668 if (type == EVENT_NONE)
2669 return 0;
2670
2671 /* Handle concatenation of print lines */
2672 if (type == EVENT_DQUOTE) {
2673 char *cat;
2674
2675 cat = malloc_or_die(strlen(event->print_fmt.format) +
2676 strlen(token) + 1);
2677 strcpy(cat, event->print_fmt.format);
2678 strcat(cat, token);
2679 free_token(token);
2680 free_token(event->print_fmt.format);
2681 event->print_fmt.format = NULL;
2682 token = cat;
2683 goto concat;
2684 }
2685
2686 if (test_type_token(type, token, EVENT_DELIM, ","))
2687 goto fail;
2688
2689 free_token(token);
2690
2691 ret = event_read_print_args(event, &event->print_fmt.args);
2692 if (ret < 0)
2693 return -1;
2694
2695 return ret;
2696
2697 fail:
2698 free_token(token);
2699 return -1;
2700}
2701
2702/**
2703 * pevent_find_common_field - return a common field by event
2704 * @event: handle for the event
2705 * @name: the name of the common field to return
2706 *
2707 * Returns a common field from the event by the given @name.
2708 * This only searchs the common fields and not all field.
2709 */
2710struct format_field *
2711pevent_find_common_field(struct event_format *event, const char *name)
2712{
2713 struct format_field *format;
2714
2715 for (format = event->format.common_fields;
2716 format; format = format->next) {
2717 if (strcmp(format->name, name) == 0)
2718 break;
2719 }
2720
2721 return format;
2722}
2723
2724/**
2725 * pevent_find_field - find a non-common field
2726 * @event: handle for the event
2727 * @name: the name of the non-common field
2728 *
2729 * Returns a non-common field by the given @name.
2730 * This does not search common fields.
2731 */
2732struct format_field *
2733pevent_find_field(struct event_format *event, const char *name)
2734{
2735 struct format_field *format;
2736
2737 for (format = event->format.fields;
2738 format; format = format->next) {
2739 if (strcmp(format->name, name) == 0)
2740 break;
2741 }
2742
2743 return format;
2744}
2745
2746/**
2747 * pevent_find_any_field - find any field by name
2748 * @event: handle for the event
2749 * @name: the name of the field
2750 *
2751 * Returns a field by the given @name.
2752 * This searchs the common field names first, then
2753 * the non-common ones if a common one was not found.
2754 */
2755struct format_field *
2756pevent_find_any_field(struct event_format *event, const char *name)
2757{
2758 struct format_field *format;
2759
2760 format = pevent_find_common_field(event, name);
2761 if (format)
2762 return format;
2763 return pevent_find_field(event, name);
2764}
2765
2766/**
2767 * pevent_read_number - read a number from data
2768 * @pevent: handle for the pevent
2769 * @ptr: the raw data
2770 * @size: the size of the data that holds the number
2771 *
2772 * Returns the number (converted to host) from the
2773 * raw data.
2774 */
2775unsigned long long pevent_read_number(struct pevent *pevent,
2776 const void *ptr, int size)
2777{
2778 switch (size) {
2779 case 1:
2780 return *(unsigned char *)ptr;
2781 case 2:
2782 return data2host2(pevent, ptr);
2783 case 4:
2784 return data2host4(pevent, ptr);
2785 case 8:
2786 return data2host8(pevent, ptr);
2787 default:
2788 /* BUG! */
2789 return 0;
2790 }
2791}
2792
2793/**
2794 * pevent_read_number_field - read a number from data
2795 * @field: a handle to the field
2796 * @data: the raw data to read
2797 * @value: the value to place the number in
2798 *
2799 * Reads raw data according to a field offset and size,
2800 * and translates it into @value.
2801 *
2802 * Returns 0 on success, -1 otherwise.
2803 */
2804int pevent_read_number_field(struct format_field *field, const void *data,
2805 unsigned long long *value)
2806{
2807 if (!field)
2808 return -1;
2809 switch (field->size) {
2810 case 1:
2811 case 2:
2812 case 4:
2813 case 8:
2814 *value = pevent_read_number(field->event->pevent,
2815 data + field->offset, field->size);
2816 return 0;
2817 default:
2818 return -1;
2819 }
2820}
2821
2822static int get_common_info(struct pevent *pevent,
2823 const char *type, int *offset, int *size)
2824{
2825 struct event_format *event;
2826 struct format_field *field;
2827
2828 /*
2829 * All events should have the same common elements.
2830 * Pick any event to find where the type is;
2831 */
2832 if (!pevent->events)
2833 die("no event_list!");
2834
2835 event = pevent->events[0];
2836 field = pevent_find_common_field(event, type);
2837 if (!field)
2838 die("field '%s' not found", type);
2839
2840 *offset = field->offset;
2841 *size = field->size;
2842
2843 return 0;
2844}
2845
2846static int __parse_common(struct pevent *pevent, void *data,
2847 int *size, int *offset, const char *name)
2848{
2849 int ret;
2850
2851 if (!*size) {
2852 ret = get_common_info(pevent, name, offset, size);
2853 if (ret < 0)
2854 return ret;
2855 }
2856 return pevent_read_number(pevent, data + *offset, *size);
2857}
2858
2859static int trace_parse_common_type(struct pevent *pevent, void *data)
2860{
2861 return __parse_common(pevent, data,
2862 &pevent->type_size, &pevent->type_offset,
2863 "common_type");
2864}
2865
2866static int parse_common_pid(struct pevent *pevent, void *data)
2867{
2868 return __parse_common(pevent, data,
2869 &pevent->pid_size, &pevent->pid_offset,
2870 "common_pid");
2871}
2872
2873static int parse_common_pc(struct pevent *pevent, void *data)
2874{
2875 return __parse_common(pevent, data,
2876 &pevent->pc_size, &pevent->pc_offset,
2877 "common_preempt_count");
2878}
2879
2880static int parse_common_flags(struct pevent *pevent, void *data)
2881{
2882 return __parse_common(pevent, data,
2883 &pevent->flags_size, &pevent->flags_offset,
2884 "common_flags");
2885}
2886
2887static int parse_common_lock_depth(struct pevent *pevent, void *data)
2888{
2889 int ret;
2890
2891 ret = __parse_common(pevent, data,
2892 &pevent->ld_size, &pevent->ld_offset,
2893 "common_lock_depth");
2894 if (ret < 0)
2895 return -1;
2896
2897 return ret;
2898}
2899
2900static int events_id_cmp(const void *a, const void *b);
2901
2902/**
2903 * pevent_find_event - find an event by given id
2904 * @pevent: a handle to the pevent
2905 * @id: the id of the event
2906 *
2907 * Returns an event that has a given @id.
2908 */
2909struct event_format *pevent_find_event(struct pevent *pevent, int id)
2910{
2911 struct event_format **eventptr;
2912 struct event_format key;
2913 struct event_format *pkey = &key;
2914
2915 /* Check cache first */
2916 if (pevent->last_event && pevent->last_event->id == id)
2917 return pevent->last_event;
2918
2919 key.id = id;
2920
2921 eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
2922 sizeof(*pevent->events), events_id_cmp);
2923
2924 if (eventptr) {
2925 pevent->last_event = *eventptr;
2926 return *eventptr;
2927 }
2928
2929 return NULL;
2930}
2931
2932/**
2933 * pevent_find_event_by_name - find an event by given name
2934 * @pevent: a handle to the pevent
2935 * @sys: the system name to search for
2936 * @name: the name of the event to search for
2937 *
2938 * This returns an event with a given @name and under the system
2939 * @sys. If @sys is NULL the first event with @name is returned.
2940 */
2941struct event_format *
2942pevent_find_event_by_name(struct pevent *pevent,
2943 const char *sys, const char *name)
2944{
2945 struct event_format *event;
2946 int i;
2947
2948 if (pevent->last_event &&
2949 strcmp(pevent->last_event->name, name) == 0 &&
2950 (!sys || strcmp(pevent->last_event->system, sys) == 0))
2951 return pevent->last_event;
2952
2953 for (i = 0; i < pevent->nr_events; i++) {
2954 event = pevent->events[i];
2955 if (strcmp(event->name, name) == 0) {
2956 if (!sys)
2957 break;
2958 if (strcmp(event->system, sys) == 0)
2959 break;
2960 }
2961 }
2962 if (i == pevent->nr_events)
2963 event = NULL;
2964
2965 pevent->last_event = event;
2966 return event;
2967}
2968
2969static unsigned long long
2970eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
2971{
2972 struct pevent *pevent = event->pevent;
2973 unsigned long long val = 0;
2974 unsigned long long left, right;
2975 struct print_arg *typearg = NULL;
2976 struct print_arg *larg;
2977 unsigned long offset;
2978 unsigned int field_size;
2979
2980 switch (arg->type) {
2981 case PRINT_NULL:
2982 /* ?? */
2983 return 0;
2984 case PRINT_ATOM:
2985 return strtoull(arg->atom.atom, NULL, 0);
2986 case PRINT_FIELD:
2987 if (!arg->field.field) {
2988 arg->field.field = pevent_find_any_field(event, arg->field.name);
2989 if (!arg->field.field)
2990 die("field %s not found", arg->field.name);
2991 }
2992 /* must be a number */
2993 val = pevent_read_number(pevent, data + arg->field.field->offset,
2994 arg->field.field->size);
2995 break;
2996 case PRINT_FLAGS:
2997 case PRINT_SYMBOL:
2998 break;
2999 case PRINT_TYPE:
3000 val = eval_num_arg(data, size, event, arg->typecast.item);
3001 return eval_type(val, arg, 0);
3002 case PRINT_STRING:
3003 case PRINT_BSTRING:
3004 return 0;
3005 case PRINT_FUNC: {
3006 struct trace_seq s;
3007 trace_seq_init(&s);
3008 val = process_defined_func(&s, data, size, event, arg);
3009 trace_seq_destroy(&s);
3010 return val;
3011 }
3012 case PRINT_OP:
3013 if (strcmp(arg->op.op, "[") == 0) {
3014 /*
3015 * Arrays are special, since we don't want
3016 * to read the arg as is.
3017 */
3018 right = eval_num_arg(data, size, event, arg->op.right);
3019
3020 /* handle typecasts */
3021 larg = arg->op.left;
3022 while (larg->type == PRINT_TYPE) {
3023 if (!typearg)
3024 typearg = larg;
3025 larg = larg->typecast.item;
3026 }
3027
3028 /* Default to long size */
3029 field_size = pevent->long_size;
3030
3031 switch (larg->type) {
3032 case PRINT_DYNAMIC_ARRAY:
3033 offset = pevent_read_number(pevent,
3034 data + larg->dynarray.field->offset,
3035 larg->dynarray.field->size);
3036 if (larg->dynarray.field->elementsize)
3037 field_size = larg->dynarray.field->elementsize;
3038 /*
3039 * The actual length of the dynamic array is stored
3040 * in the top half of the field, and the offset
3041 * is in the bottom half of the 32 bit field.
3042 */
3043 offset &= 0xffff;
3044 offset += right;
3045 break;
3046 case PRINT_FIELD:
3047 if (!larg->field.field) {
3048 larg->field.field =
3049 pevent_find_any_field(event, larg->field.name);
3050 if (!larg->field.field)
3051 die("field %s not found", larg->field.name);
3052 }
3053 field_size = larg->field.field->elementsize;
3054 offset = larg->field.field->offset +
3055 right * larg->field.field->elementsize;
3056 break;
3057 default:
3058 goto default_op; /* oops, all bets off */
3059 }
3060 val = pevent_read_number(pevent,
3061 data + offset, field_size);
3062 if (typearg)
3063 val = eval_type(val, typearg, 1);
3064 break;
3065 } else if (strcmp(arg->op.op, "?") == 0) {
3066 left = eval_num_arg(data, size, event, arg->op.left);
3067 arg = arg->op.right;
3068 if (left)
3069 val = eval_num_arg(data, size, event, arg->op.left);
3070 else
3071 val = eval_num_arg(data, size, event, arg->op.right);
3072 break;
3073 }
3074 default_op:
3075 left = eval_num_arg(data, size, event, arg->op.left);
3076 right = eval_num_arg(data, size, event, arg->op.right);
3077 switch (arg->op.op[0]) {
3078 case '!':
3079 switch (arg->op.op[1]) {
3080 case 0:
3081 val = !right;
3082 break;
3083 case '=':
3084 val = left != right;
3085 break;
3086 default:
3087 die("unknown op '%s'", arg->op.op);
3088 }
3089 break;
3090 case '~':
3091 val = ~right;
3092 break;
3093 case '|':
3094 if (arg->op.op[1])
3095 val = left || right;
3096 else
3097 val = left | right;
3098 break;
3099 case '&':
3100 if (arg->op.op[1])
3101 val = left && right;
3102 else
3103 val = left & right;
3104 break;
3105 case '<':
3106 switch (arg->op.op[1]) {
3107 case 0:
3108 val = left < right;
3109 break;
3110 case '<':
3111 val = left << right;
3112 break;
3113 case '=':
3114 val = left <= right;
3115 break;
3116 default:
3117 die("unknown op '%s'", arg->op.op);
3118 }
3119 break;
3120 case '>':
3121 switch (arg->op.op[1]) {
3122 case 0:
3123 val = left > right;
3124 break;
3125 case '>':
3126 val = left >> right;
3127 break;
3128 case '=':
3129 val = left >= right;
3130 break;
3131 default:
3132 die("unknown op '%s'", arg->op.op);
3133 }
3134 break;
3135 case '=':
3136 if (arg->op.op[1] != '=')
3137 die("unknown op '%s'", arg->op.op);
3138 val = left == right;
3139 break;
3140 case '-':
3141 val = left - right;
3142 break;
3143 case '+':
3144 val = left + right;
3145 break;
3146 case '/':
3147 val = left / right;
3148 break;
3149 case '*':
3150 val = left * right;
3151 break;
3152 default:
3153 die("unknown op '%s'", arg->op.op);
3154 }
3155 break;
3156 default: /* not sure what to do there */
3157 return 0;
3158 }
3159 return val;
3160}
3161
3162struct flag {
3163 const char *name;
3164 unsigned long long value;
3165};
3166
3167static const struct flag flags[] = {
3168 { "HI_SOFTIRQ", 0 },
3169 { "TIMER_SOFTIRQ", 1 },
3170 { "NET_TX_SOFTIRQ", 2 },
3171 { "NET_RX_SOFTIRQ", 3 },
3172 { "BLOCK_SOFTIRQ", 4 },
3173 { "BLOCK_IOPOLL_SOFTIRQ", 5 },
3174 { "TASKLET_SOFTIRQ", 6 },
3175 { "SCHED_SOFTIRQ", 7 },
3176 { "HRTIMER_SOFTIRQ", 8 },
3177 { "RCU_SOFTIRQ", 9 },
3178
3179 { "HRTIMER_NORESTART", 0 },
3180 { "HRTIMER_RESTART", 1 },
3181};
3182
3183static unsigned long long eval_flag(const char *flag)
3184{
3185 int i;
3186
3187 /*
3188 * Some flags in the format files do not get converted.
3189 * If the flag is not numeric, see if it is something that
3190 * we already know about.
3191 */
3192 if (isdigit(flag[0]))
3193 return strtoull(flag, NULL, 0);
3194
3195 for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3196 if (strcmp(flags[i].name, flag) == 0)
3197 return flags[i].value;
3198
3199 return 0;
3200}
3201
3202static void print_str_to_seq(struct trace_seq *s, const char *format,
3203 int len_arg, const char *str)
3204{
3205 if (len_arg >= 0)
3206 trace_seq_printf(s, format, len_arg, str);
3207 else
3208 trace_seq_printf(s, format, str);
3209}
3210
3211static void print_str_arg(struct trace_seq *s, void *data, int size,
3212 struct event_format *event, const char *format,
3213 int len_arg, struct print_arg *arg)
3214{
3215 struct pevent *pevent = event->pevent;
3216 struct print_flag_sym *flag;
3217 unsigned long long val, fval;
3218 unsigned long addr;
3219 char *str;
3220 int print;
3221 int len;
3222
3223 switch (arg->type) {
3224 case PRINT_NULL:
3225 /* ?? */
3226 return;
3227 case PRINT_ATOM:
3228 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3229 return;
3230 case PRINT_FIELD:
3231 if (!arg->field.field) {
3232 arg->field.field = pevent_find_any_field(event, arg->field.name);
3233 if (!arg->field.field)
3234 die("field %s not found", arg->field.name);
3235 }
3236 /* Zero sized fields, mean the rest of the data */
3237 len = arg->field.field->size ? : size - arg->field.field->offset;
3238
3239 /*
3240 * Some events pass in pointers. If this is not an array
3241 * and the size is the same as long_size, assume that it
3242 * is a pointer.
3243 */
3244 if (!(arg->field.field->flags & FIELD_IS_ARRAY) &&
3245 arg->field.field->size == pevent->long_size) {
3246 addr = *(unsigned long *)(data + arg->field.field->offset);
3247 trace_seq_printf(s, "%lx", addr);
3248 break;
3249 }
3250 str = malloc_or_die(len + 1);
3251 memcpy(str, data + arg->field.field->offset, len);
3252 str[len] = 0;
3253 print_str_to_seq(s, format, len_arg, str);
3254 free(str);
3255 break;
3256 case PRINT_FLAGS:
3257 val = eval_num_arg(data, size, event, arg->flags.field);
3258 print = 0;
3259 for (flag = arg->flags.flags; flag; flag = flag->next) {
3260 fval = eval_flag(flag->value);
3261 if (!val && !fval) {
3262 print_str_to_seq(s, format, len_arg, flag->str);
3263 break;
3264 }
3265 if (fval && (val & fval) == fval) {
3266 if (print && arg->flags.delim)
3267 trace_seq_puts(s, arg->flags.delim);
3268 print_str_to_seq(s, format, len_arg, flag->str);
3269 print = 1;
3270 val &= ~fval;
3271 }
3272 }
3273 break;
3274 case PRINT_SYMBOL:
3275 val = eval_num_arg(data, size, event, arg->symbol.field);
3276 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3277 fval = eval_flag(flag->value);
3278 if (val == fval) {
3279 print_str_to_seq(s, format, len_arg, flag->str);
3280 break;
3281 }
3282 }
3283 break;
3284
3285 case PRINT_TYPE:
3286 break;
3287 case PRINT_STRING: {
3288 int str_offset;
3289
3290 if (arg->string.offset == -1) {
3291 struct format_field *f;
3292
3293 f = pevent_find_any_field(event, arg->string.string);
3294 arg->string.offset = f->offset;
3295 }
3296 str_offset = data2host4(pevent, data + arg->string.offset);
3297 str_offset &= 0xffff;
3298 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
3299 break;
3300 }
3301 case PRINT_BSTRING:
3302 trace_seq_printf(s, format, arg->string.string);
3303 break;
3304 case PRINT_OP:
3305 /*
3306 * The only op for string should be ? :
3307 */
3308 if (arg->op.op[0] != '?')
3309 return;
3310 val = eval_num_arg(data, size, event, arg->op.left);
3311 if (val)
3312 print_str_arg(s, data, size, event,
3313 format, len_arg, arg->op.right->op.left);
3314 else
3315 print_str_arg(s, data, size, event,
3316 format, len_arg, arg->op.right->op.right);
3317 break;
3318 case PRINT_FUNC:
3319 process_defined_func(s, data, size, event, arg);
3320 break;
3321 default:
3322 /* well... */
3323 break;
3324 }
3325}
3326
3327static unsigned long long
3328process_defined_func(struct trace_seq *s, void *data, int size,
3329 struct event_format *event, struct print_arg *arg)
3330{
3331 struct pevent_function_handler *func_handle = arg->func.func;
3332 struct pevent_func_params *param;
3333 unsigned long long *args;
3334 unsigned long long ret;
3335 struct print_arg *farg;
3336 struct trace_seq str;
3337 struct save_str {
3338 struct save_str *next;
3339 char *str;
3340 } *strings = NULL, *string;
3341 int i;
3342
3343 if (!func_handle->nr_args) {
3344 ret = (*func_handle->func)(s, NULL);
3345 goto out;
3346 }
3347
3348 farg = arg->func.args;
3349 param = func_handle->params;
3350
3351 args = malloc_or_die(sizeof(*args) * func_handle->nr_args);
3352 for (i = 0; i < func_handle->nr_args; i++) {
3353 switch (param->type) {
3354 case PEVENT_FUNC_ARG_INT:
3355 case PEVENT_FUNC_ARG_LONG:
3356 case PEVENT_FUNC_ARG_PTR:
3357 args[i] = eval_num_arg(data, size, event, farg);
3358 break;
3359 case PEVENT_FUNC_ARG_STRING:
3360 trace_seq_init(&str);
3361 print_str_arg(&str, data, size, event, "%s", -1, farg);
3362 trace_seq_terminate(&str);
3363 string = malloc_or_die(sizeof(*string));
3364 string->next = strings;
3365 string->str = strdup(str.buffer);
3366 strings = string;
3367 trace_seq_destroy(&str);
3368 break;
3369 default:
3370 /*
3371 * Something went totally wrong, this is not
3372 * an input error, something in this code broke.
3373 */
3374 die("Unexpected end of arguments\n");
3375 break;
3376 }
3377 farg = farg->next;
3378 param = param->next;
3379 }
3380
3381 ret = (*func_handle->func)(s, args);
3382 free(args);
3383 while (strings) {
3384 string = strings;
3385 strings = string->next;
3386 free(string->str);
3387 free(string);
3388 }
3389
3390 out:
3391 /* TBD : handle return type here */
3392 return ret;
3393}
3394
3395static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
3396{
3397 struct pevent *pevent = event->pevent;
3398 struct format_field *field, *ip_field;
3399 struct print_arg *args, *arg, **next;
3400 unsigned long long ip, val;
3401 char *ptr;
3402 void *bptr;
3403
3404 field = pevent->bprint_buf_field;
3405 ip_field = pevent->bprint_ip_field;
3406
3407 if (!field) {
3408 field = pevent_find_field(event, "buf");
3409 if (!field)
3410 die("can't find buffer field for binary printk");
3411 ip_field = pevent_find_field(event, "ip");
3412 if (!ip_field)
3413 die("can't find ip field for binary printk");
3414 pevent->bprint_buf_field = field;
3415 pevent->bprint_ip_field = ip_field;
3416 }
3417
3418 ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
3419
3420 /*
3421 * The first arg is the IP pointer.
3422 */
3423 args = alloc_arg();
3424 arg = args;
3425 arg->next = NULL;
3426 next = &arg->next;
3427
3428 arg->type = PRINT_ATOM;
3429 arg->atom.atom = malloc_or_die(32);
3430 sprintf(arg->atom.atom, "%lld", ip);
3431
3432 /* skip the first "%pf : " */
3433 for (ptr = fmt + 6, bptr = data + field->offset;
3434 bptr < data + size && *ptr; ptr++) {
3435 int ls = 0;
3436
3437 if (*ptr == '%') {
3438 process_again:
3439 ptr++;
3440 switch (*ptr) {
3441 case '%':
3442 break;
3443 case 'l':
3444 ls++;
3445 goto process_again;
3446 case 'L':
3447 ls = 2;
3448 goto process_again;
3449 case '0' ... '9':
3450 goto process_again;
3451 case 'p':
3452 ls = 1;
3453 /* fall through */
3454 case 'd':
3455 case 'u':
3456 case 'x':
3457 case 'i':
3458 /* the pointers are always 4 bytes aligned */
3459 bptr = (void *)(((unsigned long)bptr + 3) &
3460 ~3);
3461 switch (ls) {
3462 case 0:
3463 ls = 4;
3464 break;
3465 case 1:
3466 ls = pevent->long_size;
3467 break;
3468 case 2:
3469 ls = 8;
3470 default:
3471 break;
3472 }
3473 val = pevent_read_number(pevent, bptr, ls);
3474 bptr += ls;
3475 arg = alloc_arg();
3476 arg->next = NULL;
3477 arg->type = PRINT_ATOM;
3478 arg->atom.atom = malloc_or_die(32);
3479 sprintf(arg->atom.atom, "%lld", val);
3480 *next = arg;
3481 next = &arg->next;
3482 break;
3483 case 's':
3484 arg = alloc_arg();
3485 arg->next = NULL;
3486 arg->type = PRINT_BSTRING;
3487 arg->string.string = strdup(bptr);
3488 bptr += strlen(bptr) + 1;
3489 *next = arg;
3490 next = &arg->next;
3491 default:
3492 break;
3493 }
3494 }
3495 }
3496
3497 return args;
3498}
3499
3500static void free_args(struct print_arg *args)
3501{
3502 struct print_arg *next;
3503
3504 while (args) {
3505 next = args->next;
3506
3507 free_arg(args);
3508 args = next;
3509 }
3510}
3511
3512static char *
3513get_bprint_format(void *data, int size __unused, struct event_format *event)
3514{
3515 struct pevent *pevent = event->pevent;
3516 unsigned long long addr;
3517 struct format_field *field;
3518 struct printk_map *printk;
3519 char *format;
3520 char *p;
3521
3522 field = pevent->bprint_fmt_field;
3523
3524 if (!field) {
3525 field = pevent_find_field(event, "fmt");
3526 if (!field)
3527 die("can't find format field for binary printk");
3528 pevent->bprint_fmt_field = field;
3529 }
3530
3531 addr = pevent_read_number(pevent, data + field->offset, field->size);
3532
3533 printk = find_printk(pevent, addr);
3534 if (!printk) {
3535 format = malloc_or_die(45);
3536 sprintf(format, "%%pf : (NO FORMAT FOUND at %llx)\n",
3537 addr);
3538 return format;
3539 }
3540
3541 p = printk->printk;
3542 /* Remove any quotes. */
3543 if (*p == '"')
3544 p++;
3545 format = malloc_or_die(strlen(p) + 10);
3546 sprintf(format, "%s : %s", "%pf", p);
3547 /* remove ending quotes and new line since we will add one too */
3548 p = format + strlen(format) - 1;
3549 if (*p == '"')
3550 *p = 0;
3551
3552 p -= 2;
3553 if (strcmp(p, "\\n") == 0)
3554 *p = 0;
3555
3556 return format;
3557}
3558
3559static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
3560 struct event_format *event, struct print_arg *arg)
3561{
3562 unsigned char *buf;
3563 char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
3564
3565 if (arg->type == PRINT_FUNC) {
3566 process_defined_func(s, data, size, event, arg);
3567 return;
3568 }
3569
3570 if (arg->type != PRINT_FIELD) {
3571 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
3572 arg->type);
3573 return;
3574 }
3575
3576 if (mac == 'm')
3577 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
3578 if (!arg->field.field) {
3579 arg->field.field =
3580 pevent_find_any_field(event, arg->field.name);
3581 if (!arg->field.field)
3582 die("field %s not found", arg->field.name);
3583 }
3584 if (arg->field.field->size != 6) {
3585 trace_seq_printf(s, "INVALIDMAC");
3586 return;
3587 }
3588 buf = data + arg->field.field->offset;
3589 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
3590}
3591
3592static void print_event_fields(struct trace_seq *s, void *data, int size,
3593 struct event_format *event)
3594{
3595 struct format_field *field;
3596 unsigned long long val;
3597 unsigned int offset, len, i;
3598
3599 field = event->format.fields;
3600 while (field) {
3601 trace_seq_printf(s, " %s=", field->name);
3602 if (field->flags & FIELD_IS_ARRAY) {
3603 offset = field->offset;
3604 len = field->size;
3605 if (field->flags & FIELD_IS_DYNAMIC) {
3606 val = pevent_read_number(event->pevent, data + offset, len);
3607 offset = val;
3608 len = offset >> 16;
3609 offset &= 0xffff;
3610 }
3611 if (field->flags & FIELD_IS_STRING) {
3612 trace_seq_printf(s, "%s", (char *)data + offset);
3613 } else {
3614 trace_seq_puts(s, "ARRAY[");
3615 for (i = 0; i < len; i++) {
3616 if (i)
3617 trace_seq_puts(s, ", ");
3618 trace_seq_printf(s, "%02x",
3619 *((unsigned char *)data + offset + i));
3620 }
3621 trace_seq_putc(s, ']');
3622 }
3623 } else {
3624 val = pevent_read_number(event->pevent, data + field->offset,
3625 field->size);
3626 if (field->flags & FIELD_IS_POINTER) {
3627 trace_seq_printf(s, "0x%llx", val);
3628 } else if (field->flags & FIELD_IS_SIGNED) {
3629 switch (field->size) {
3630 case 4:
3631 /*
3632 * If field is long then print it in hex.
3633 * A long usually stores pointers.
3634 */
3635 if (field->flags & FIELD_IS_LONG)
3636 trace_seq_printf(s, "0x%x", (int)val);
3637 else
3638 trace_seq_printf(s, "%d", (int)val);
3639 break;
3640 case 2:
3641 trace_seq_printf(s, "%2d", (short)val);
3642 break;
3643 case 1:
3644 trace_seq_printf(s, "%1d", (char)val);
3645 break;
3646 default:
3647 trace_seq_printf(s, "%lld", val);
3648 }
3649 } else {
3650 if (field->flags & FIELD_IS_LONG)
3651 trace_seq_printf(s, "0x%llx", val);
3652 else
3653 trace_seq_printf(s, "%llu", val);
3654 }
3655 }
3656 field = field->next;
3657 }
3658}
3659
3660static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
3661{
3662 struct pevent *pevent = event->pevent;
3663 struct print_fmt *print_fmt = &event->print_fmt;
3664 struct print_arg *arg = print_fmt->args;
3665 struct print_arg *args = NULL;
3666 const char *ptr = print_fmt->format;
3667 unsigned long long val;
3668 struct func_map *func;
3669 const char *saveptr;
3670 char *bprint_fmt = NULL;
3671 char format[32];
3672 int show_func;
3673 int len_as_arg;
3674 int len_arg;
3675 int len;
3676 int ls;
3677
3678 if (event->flags & EVENT_FL_FAILED) {
3679 trace_seq_printf(s, "[FAILED TO PARSE]");
3680 print_event_fields(s, data, size, event);
3681 return;
3682 }
3683
3684 if (event->flags & EVENT_FL_ISBPRINT) {
3685 bprint_fmt = get_bprint_format(data, size, event);
3686 args = make_bprint_args(bprint_fmt, data, size, event);
3687 arg = args;
3688 ptr = bprint_fmt;
3689 }
3690
3691 for (; *ptr; ptr++) {
3692 ls = 0;
3693 if (*ptr == '\\') {
3694 ptr++;
3695 switch (*ptr) {
3696 case 'n':
3697 trace_seq_putc(s, '\n');
3698 break;
3699 case 't':
3700 trace_seq_putc(s, '\t');
3701 break;
3702 case 'r':
3703 trace_seq_putc(s, '\r');
3704 break;
3705 case '\\':
3706 trace_seq_putc(s, '\\');
3707 break;
3708 default:
3709 trace_seq_putc(s, *ptr);
3710 break;
3711 }
3712
3713 } else if (*ptr == '%') {
3714 saveptr = ptr;
3715 show_func = 0;
3716 len_as_arg = 0;
3717 cont_process:
3718 ptr++;
3719 switch (*ptr) {
3720 case '%':
3721 trace_seq_putc(s, '%');
3722 break;
3723 case '#':
3724 /* FIXME: need to handle properly */
3725 goto cont_process;
3726 case 'h':
3727 ls--;
3728 goto cont_process;
3729 case 'l':
3730 ls++;
3731 goto cont_process;
3732 case 'L':
3733 ls = 2;
3734 goto cont_process;
3735 case '*':
3736 /* The argument is the length. */
3737 if (!arg)
3738 die("no argument match");
3739 len_arg = eval_num_arg(data, size, event, arg);
3740 len_as_arg = 1;
3741 arg = arg->next;
3742 goto cont_process;
3743 case '.':
3744 case 'z':
3745 case 'Z':
3746 case '0' ... '9':
3747 goto cont_process;
3748 case 'p':
3749 if (pevent->long_size == 4)
3750 ls = 1;
3751 else
3752 ls = 2;
3753
3754 if (*(ptr+1) == 'F' ||
3755 *(ptr+1) == 'f') {
3756 ptr++;
3757 show_func = *ptr;
3758 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
3759 print_mac_arg(s, *(ptr+1), data, size, event, arg);
3760 ptr++;
3761 break;
3762 }
3763
3764 /* fall through */
3765 case 'd':
3766 case 'i':
3767 case 'x':
3768 case 'X':
3769 case 'u':
3770 if (!arg)
3771 die("no argument match");
3772
3773 len = ((unsigned long)ptr + 1) -
3774 (unsigned long)saveptr;
3775
3776 /* should never happen */
3777 if (len > 31)
3778 die("bad format!");
3779
3780 memcpy(format, saveptr, len);
3781 format[len] = 0;
3782
3783 val = eval_num_arg(data, size, event, arg);
3784 arg = arg->next;
3785
3786 if (show_func) {
3787 func = find_func(pevent, val);
3788 if (func) {
3789 trace_seq_puts(s, func->func);
3790 if (show_func == 'F')
3791 trace_seq_printf(s,
3792 "+0x%llx",
3793 val - func->addr);
3794 break;
3795 }
3796 }
3797 if (pevent->long_size == 8 && ls) {
3798 char *p;
3799
3800 ls = 2;
3801 /* make %l into %ll */
3802 p = strchr(format, 'l');
3803 if (p)
3804 memmove(p, p+1, strlen(p)+1);
3805 else if (strcmp(format, "%p") == 0)
3806 strcpy(format, "0x%llx");
3807 }
3808 switch (ls) {
3809 case -2:
3810 if (len_as_arg)
3811 trace_seq_printf(s, format, len_arg, (char)val);
3812 else
3813 trace_seq_printf(s, format, (char)val);
3814 break;
3815 case -1:
3816 if (len_as_arg)
3817 trace_seq_printf(s, format, len_arg, (short)val);
3818 else
3819 trace_seq_printf(s, format, (short)val);
3820 break;
3821 case 0:
3822 if (len_as_arg)
3823 trace_seq_printf(s, format, len_arg, (int)val);
3824 else
3825 trace_seq_printf(s, format, (int)val);
3826 break;
3827 case 1:
3828 if (len_as_arg)
3829 trace_seq_printf(s, format, len_arg, (long)val);
3830 else
3831 trace_seq_printf(s, format, (long)val);
3832 break;
3833 case 2:
3834 if (len_as_arg)
3835 trace_seq_printf(s, format, len_arg,
3836 (long long)val);
3837 else
3838 trace_seq_printf(s, format, (long long)val);
3839 break;
3840 default:
3841 die("bad count (%d)", ls);
3842 }
3843 break;
3844 case 's':
3845 if (!arg)
3846 die("no matching argument");
3847
3848 len = ((unsigned long)ptr + 1) -
3849 (unsigned long)saveptr;
3850
3851 /* should never happen */
3852 if (len > 31)
3853 die("bad format!");
3854
3855 memcpy(format, saveptr, len);
3856 format[len] = 0;
3857 if (!len_as_arg)
3858 len_arg = -1;
3859 print_str_arg(s, data, size, event,
3860 format, len_arg, arg);
3861 arg = arg->next;
3862 break;
3863 default:
3864 trace_seq_printf(s, ">%c<", *ptr);
3865
3866 }
3867 } else
3868 trace_seq_putc(s, *ptr);
3869 }
3870
3871 if (args) {
3872 free_args(args);
3873 free(bprint_fmt);
3874 }
3875}
3876
3877/**
3878 * pevent_data_lat_fmt - parse the data for the latency format
3879 * @pevent: a handle to the pevent
3880 * @s: the trace_seq to write to
3881 * @data: the raw data to read from
3882 * @size: currently unused.
3883 *
3884 * This parses out the Latency format (interrupts disabled,
3885 * need rescheduling, in hard/soft interrupt, preempt count
3886 * and lock depth) and places it into the trace_seq.
3887 */
3888void pevent_data_lat_fmt(struct pevent *pevent,
3889 struct trace_seq *s, struct pevent_record *record)
3890{
3891 static int check_lock_depth = 1;
3892 static int lock_depth_exists;
3893 unsigned int lat_flags;
3894 unsigned int pc;
3895 int lock_depth;
3896 int hardirq;
3897 int softirq;
3898 void *data = record->data;
3899
3900 lat_flags = parse_common_flags(pevent, data);
3901 pc = parse_common_pc(pevent, data);
3902 /* lock_depth may not always exist */
3903 if (check_lock_depth) {
3904 struct format_field *field;
3905 struct event_format *event;
3906
3907 check_lock_depth = 0;
3908 event = pevent->events[0];
3909 field = pevent_find_common_field(event, "common_lock_depth");
3910 if (field)
3911 lock_depth_exists = 1;
3912 }
3913 if (lock_depth_exists)
3914 lock_depth = parse_common_lock_depth(pevent, data);
3915
3916 hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
3917 softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
3918
3919 trace_seq_printf(s, "%c%c%c",
3920 (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
3921 (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
3922 'X' : '.',
3923 (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
3924 'N' : '.',
3925 (hardirq && softirq) ? 'H' :
3926 hardirq ? 'h' : softirq ? 's' : '.');
3927
3928 if (pc)
3929 trace_seq_printf(s, "%x", pc);
3930 else
3931 trace_seq_putc(s, '.');
3932
3933 if (lock_depth_exists) {
3934 if (lock_depth < 0)
3935 trace_seq_putc(s, '.');
3936 else
3937 trace_seq_printf(s, "%d", lock_depth);
3938 }
3939
3940 trace_seq_terminate(s);
3941}
3942
3943/**
3944 * pevent_data_type - parse out the given event type
3945 * @pevent: a handle to the pevent
3946 * @rec: the record to read from
3947 *
3948 * This returns the event id from the @rec.
3949 */
3950int pevent_data_type(struct pevent *pevent, struct pevent_record *rec)
3951{
3952 return trace_parse_common_type(pevent, rec->data);
3953}
3954
3955/**
3956 * pevent_data_event_from_type - find the event by a given type
3957 * @pevent: a handle to the pevent
3958 * @type: the type of the event.
3959 *
3960 * This returns the event form a given @type;
3961 */
3962struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
3963{
3964 return pevent_find_event(pevent, type);
3965}
3966
3967/**
3968 * pevent_data_pid - parse the PID from raw data
3969 * @pevent: a handle to the pevent
3970 * @rec: the record to parse
3971 *
3972 * This returns the PID from a raw data.
3973 */
3974int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec)
3975{
3976 return parse_common_pid(pevent, rec->data);
3977}
3978
3979/**
3980 * pevent_data_comm_from_pid - return the command line from PID
3981 * @pevent: a handle to the pevent
3982 * @pid: the PID of the task to search for
3983 *
3984 * This returns a pointer to the command line that has the given
3985 * @pid.
3986 */
3987const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
3988{
3989 const char *comm;
3990
3991 comm = find_cmdline(pevent, pid);
3992 return comm;
3993}
3994
3995/**
3996 * pevent_data_comm_from_pid - parse the data into the print format
3997 * @s: the trace_seq to write to
3998 * @event: the handle to the event
3999 * @cpu: the cpu the event was recorded on
4000 * @data: the raw data
4001 * @size: the size of the raw data
4002 * @nsecs: the timestamp of the event
4003 *
4004 * This parses the raw @data using the given @event information and
4005 * writes the print format into the trace_seq.
4006 */
4007void pevent_event_info(struct trace_seq *s, struct event_format *event,
4008 struct pevent_record *record)
4009{
4010 int print_pretty = 1;
4011
4012 if (event->pevent->print_raw)
4013 print_event_fields(s, record->data, record->size, event);
4014 else {
4015
4016 if (event->handler)
4017 print_pretty = event->handler(s, record, event,
4018 event->context);
4019
4020 if (print_pretty)
4021 pretty_print(s, record->data, record->size, event);
4022 }
4023
4024 trace_seq_terminate(s);
4025}
4026
4027void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
4028 struct pevent_record *record)
4029{
4030 static char *spaces = " "; /* 20 spaces */
4031 struct event_format *event;
4032 unsigned long secs;
4033 unsigned long usecs;
4034 unsigned long nsecs;
4035 const char *comm;
4036 void *data = record->data;
4037 int type;
4038 int pid;
4039 int len;
4040 int p;
4041
4042 secs = record->ts / NSECS_PER_SEC;
4043 nsecs = record->ts - secs * NSECS_PER_SEC;
4044
4045 if (record->size < 0) {
4046 do_warning("ug! negative record size %d", record->size);
4047 return;
4048 }
4049
4050 type = trace_parse_common_type(pevent, data);
4051
4052 event = pevent_find_event(pevent, type);
4053 if (!event) {
4054 do_warning("ug! no event found for type %d", type);
4055 return;
4056 }
4057
4058 pid = parse_common_pid(pevent, data);
4059 comm = find_cmdline(pevent, pid);
4060
4061 if (pevent->latency_format) {
4062 trace_seq_printf(s, "%8.8s-%-5d %3d",
4063 comm, pid, record->cpu);
4064 pevent_data_lat_fmt(pevent, s, record);
4065 } else
4066 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
4067
4068 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
4069 usecs = nsecs;
4070 p = 9;
4071 } else {
4072 usecs = (nsecs + 500) / NSECS_PER_USEC;
4073 p = 6;
4074 }
4075
4076 trace_seq_printf(s, " %5lu.%0*lu: %s: ", secs, p, usecs, event->name);
4077
4078 /* Space out the event names evenly. */
4079 len = strlen(event->name);
4080 if (len < 20)
4081 trace_seq_printf(s, "%.*s", 20 - len, spaces);
4082
4083 pevent_event_info(s, event, record);
4084}
4085
4086static int events_id_cmp(const void *a, const void *b)
4087{
4088 struct event_format * const * ea = a;
4089 struct event_format * const * eb = b;
4090
4091 if ((*ea)->id < (*eb)->id)
4092 return -1;
4093
4094 if ((*ea)->id > (*eb)->id)
4095 return 1;
4096
4097 return 0;
4098}
4099
4100static int events_name_cmp(const void *a, const void *b)
4101{
4102 struct event_format * const * ea = a;
4103 struct event_format * const * eb = b;
4104 int res;
4105
4106 res = strcmp((*ea)->name, (*eb)->name);
4107 if (res)
4108 return res;
4109
4110 res = strcmp((*ea)->system, (*eb)->system);
4111 if (res)
4112 return res;
4113
4114 return events_id_cmp(a, b);
4115}
4116
4117static int events_system_cmp(const void *a, const void *b)
4118{
4119 struct event_format * const * ea = a;
4120 struct event_format * const * eb = b;
4121 int res;
4122
4123 res = strcmp((*ea)->system, (*eb)->system);
4124 if (res)
4125 return res;
4126
4127 res = strcmp((*ea)->name, (*eb)->name);
4128 if (res)
4129 return res;
4130
4131 return events_id_cmp(a, b);
4132}
4133
4134struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
4135{
4136 struct event_format **events;
4137 int (*sort)(const void *a, const void *b);
4138
4139 events = pevent->sort_events;
4140
4141 if (events && pevent->last_type == sort_type)
4142 return events;
4143
4144 if (!events) {
4145 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
4146 if (!events)
4147 return NULL;
4148
4149 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
4150 events[pevent->nr_events] = NULL;
4151
4152 pevent->sort_events = events;
4153
4154 /* the internal events are sorted by id */
4155 if (sort_type == EVENT_SORT_ID) {
4156 pevent->last_type = sort_type;
4157 return events;
4158 }
4159 }
4160
4161 switch (sort_type) {
4162 case EVENT_SORT_ID:
4163 sort = events_id_cmp;
4164 break;
4165 case EVENT_SORT_NAME:
4166 sort = events_name_cmp;
4167 break;
4168 case EVENT_SORT_SYSTEM:
4169 sort = events_system_cmp;
4170 break;
4171 default:
4172 return events;
4173 }
4174
4175 qsort(events, pevent->nr_events, sizeof(*events), sort);
4176 pevent->last_type = sort_type;
4177
4178 return events;
4179}
4180
4181static struct format_field **
4182get_event_fields(const char *type, const char *name,
4183 int count, struct format_field *list)
4184{
4185 struct format_field **fields;
4186 struct format_field *field;
4187 int i = 0;
4188
4189 fields = malloc_or_die(sizeof(*fields) * (count + 1));
4190 for (field = list; field; field = field->next) {
4191 fields[i++] = field;
4192 if (i == count + 1) {
4193 do_warning("event %s has more %s fields than specified",
4194 name, type);
4195 i--;
4196 break;
4197 }
4198 }
4199
4200 if (i != count)
4201 do_warning("event %s has less %s fields than specified",
4202 name, type);
4203
4204 fields[i] = NULL;
4205
4206 return fields;
4207}
4208
4209/**
4210 * pevent_event_common_fields - return a list of common fields for an event
4211 * @event: the event to return the common 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 */
4216struct format_field **pevent_event_common_fields(struct event_format *event)
4217{
4218 return get_event_fields("common", event->name,
4219 event->format.nr_common,
4220 event->format.common_fields);
4221}
4222
4223/**
4224 * pevent_event_fields - return a list of event specific fields for an event
4225 * @event: the event to return the fields of.
4226 *
4227 * Returns an allocated array of fields. The last item in the array is NULL.
4228 * The array must be freed with free().
4229 */
4230struct format_field **pevent_event_fields(struct event_format *event)
4231{
4232 return get_event_fields("event", event->name,
4233 event->format.nr_fields,
4234 event->format.fields);
4235}
4236
4237static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
4238{
4239 trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
4240 if (field->next) {
4241 trace_seq_puts(s, ", ");
4242 print_fields(s, field->next);
4243 }
4244}
4245
4246/* for debugging */
4247static void print_args(struct print_arg *args)
4248{
4249 int print_paren = 1;
4250 struct trace_seq s;
4251
4252 switch (args->type) {
4253 case PRINT_NULL:
4254 printf("null");
4255 break;
4256 case PRINT_ATOM:
4257 printf("%s", args->atom.atom);
4258 break;
4259 case PRINT_FIELD:
4260 printf("REC->%s", args->field.name);
4261 break;
4262 case PRINT_FLAGS:
4263 printf("__print_flags(");
4264 print_args(args->flags.field);
4265 printf(", %s, ", args->flags.delim);
4266 trace_seq_init(&s);
4267 print_fields(&s, args->flags.flags);
4268 trace_seq_do_printf(&s);
4269 trace_seq_destroy(&s);
4270 printf(")");
4271 break;
4272 case PRINT_SYMBOL:
4273 printf("__print_symbolic(");
4274 print_args(args->symbol.field);
4275 printf(", ");
4276 trace_seq_init(&s);
4277 print_fields(&s, args->symbol.symbols);
4278 trace_seq_do_printf(&s);
4279 trace_seq_destroy(&s);
4280 printf(")");
4281 break;
4282 case PRINT_STRING:
4283 case PRINT_BSTRING:
4284 printf("__get_str(%s)", args->string.string);
4285 break;
4286 case PRINT_TYPE:
4287 printf("(%s)", args->typecast.type);
4288 print_args(args->typecast.item);
4289 break;
4290 case PRINT_OP:
4291 if (strcmp(args->op.op, ":") == 0)
4292 print_paren = 0;
4293 if (print_paren)
4294 printf("(");
4295 print_args(args->op.left);
4296 printf(" %s ", args->op.op);
4297 print_args(args->op.right);
4298 if (print_paren)
4299 printf(")");
4300 break;
4301 default:
4302 /* we should warn... */
4303 return;
4304 }
4305 if (args->next) {
4306 printf("\n");
4307 print_args(args->next);
4308 }
4309}
4310
4311static void parse_header_field(const char *field,
4312 int *offset, int *size, int mandatory)
4313{
4314 unsigned long long save_input_buf_ptr;
4315 unsigned long long save_input_buf_siz;
4316 char *token;
4317 int type;
4318
4319 save_input_buf_ptr = input_buf_ptr;
4320 save_input_buf_siz = input_buf_siz;
4321
4322 if (read_expected(EVENT_ITEM, "field") < 0)
4323 return;
4324 if (read_expected(EVENT_OP, ":") < 0)
4325 return;
4326
4327 /* type */
4328 if (read_expect_type(EVENT_ITEM, &token) < 0)
4329 goto fail;
4330 free_token(token);
4331
4332 /*
4333 * If this is not a mandatory field, then test it first.
4334 */
4335 if (mandatory) {
4336 if (read_expected(EVENT_ITEM, field) < 0)
4337 return;
4338 } else {
4339 if (read_expect_type(EVENT_ITEM, &token) < 0)
4340 goto fail;
4341 if (strcmp(token, field) != 0)
4342 goto discard;
4343 free_token(token);
4344 }
4345
4346 if (read_expected(EVENT_OP, ";") < 0)
4347 return;
4348 if (read_expected(EVENT_ITEM, "offset") < 0)
4349 return;
4350 if (read_expected(EVENT_OP, ":") < 0)
4351 return;
4352 if (read_expect_type(EVENT_ITEM, &token) < 0)
4353 goto fail;
4354 *offset = atoi(token);
4355 free_token(token);
4356 if (read_expected(EVENT_OP, ";") < 0)
4357 return;
4358 if (read_expected(EVENT_ITEM, "size") < 0)
4359 return;
4360 if (read_expected(EVENT_OP, ":") < 0)
4361 return;
4362 if (read_expect_type(EVENT_ITEM, &token) < 0)
4363 goto fail;
4364 *size = atoi(token);
4365 free_token(token);
4366 if (read_expected(EVENT_OP, ";") < 0)
4367 return;
4368 type = read_token(&token);
4369 if (type != EVENT_NEWLINE) {
4370 /* newer versions of the kernel have a "signed" type */
4371 if (type != EVENT_ITEM)
4372 goto fail;
4373
4374 if (strcmp(token, "signed") != 0)
4375 goto fail;
4376
4377 free_token(token);
4378
4379 if (read_expected(EVENT_OP, ":") < 0)
4380 return;
4381
4382 if (read_expect_type(EVENT_ITEM, &token))
4383 goto fail;
4384
4385 free_token(token);
4386 if (read_expected(EVENT_OP, ";") < 0)
4387 return;
4388
4389 if (read_expect_type(EVENT_NEWLINE, &token))
4390 goto fail;
4391 }
4392 fail:
4393 free_token(token);
4394 return;
4395
4396 discard:
4397 input_buf_ptr = save_input_buf_ptr;
4398 input_buf_siz = save_input_buf_siz;
4399 *offset = 0;
4400 *size = 0;
4401 free_token(token);
4402}
4403
4404/**
4405 * pevent_parse_header_page - parse the data stored in the header page
4406 * @pevent: the handle to the pevent
4407 * @buf: the buffer storing the header page format string
4408 * @size: the size of @buf
4409 * @long_size: the long size to use if there is no header
4410 *
4411 * This parses the header page format for information on the
4412 * ring buffer used. The @buf should be copied from
4413 *
4414 * /sys/kernel/debug/tracing/events/header_page
4415 */
4416int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
4417 int long_size)
4418{
4419 int ignore;
4420
4421 if (!size) {
4422 /*
4423 * Old kernels did not have header page info.
4424 * Sorry but we just use what we find here in user space.
4425 */
4426 pevent->header_page_ts_size = sizeof(long long);
4427 pevent->header_page_size_size = long_size;
4428 pevent->header_page_data_offset = sizeof(long long) + long_size;
4429 pevent->old_format = 1;
4430 return -1;
4431 }
4432 init_input_buf(buf, size);
4433
4434 parse_header_field("timestamp", &pevent->header_page_ts_offset,
4435 &pevent->header_page_ts_size, 1);
4436 parse_header_field("commit", &pevent->header_page_size_offset,
4437 &pevent->header_page_size_size, 1);
4438 parse_header_field("overwrite", &pevent->header_page_overwrite,
4439 &ignore, 0);
4440 parse_header_field("data", &pevent->header_page_data_offset,
4441 &pevent->header_page_data_size, 1);
4442
4443 return 0;
4444}
4445
4446static int event_matches(struct event_format *event,
4447 int id, const char *sys_name,
4448 const char *event_name)
4449{
4450 if (id >= 0 && id != event->id)
4451 return 0;
4452
4453 if (event_name && (strcmp(event_name, event->name) != 0))
4454 return 0;
4455
4456 if (sys_name && (strcmp(sys_name, event->system) != 0))
4457 return 0;
4458
4459 return 1;
4460}
4461
4462static void free_handler(struct event_handler *handle)
4463{
4464 free((void *)handle->sys_name);
4465 free((void *)handle->event_name);
4466 free(handle);
4467}
4468
4469static int find_event_handle(struct pevent *pevent, struct event_format *event)
4470{
4471 struct event_handler *handle, **next;
4472
4473 for (next = &pevent->handlers; *next;
4474 next = &(*next)->next) {
4475 handle = *next;
4476 if (event_matches(event, handle->id,
4477 handle->sys_name,
4478 handle->event_name))
4479 break;
4480 }
4481
4482 if (!(*next))
4483 return 0;
4484
4485 pr_stat("overriding event (%d) %s:%s with new print handler",
4486 event->id, event->system, event->name);
4487
4488 event->handler = handle->func;
4489 event->context = handle->context;
4490
4491 *next = handle->next;
4492 free_handler(handle);
4493
4494 return 1;
4495}
4496
4497/**
4498 * pevent_parse_event - parse the event format
4499 * @pevent: the handle to the pevent
4500 * @buf: the buffer storing the event format string
4501 * @size: the size of @buf
4502 * @sys: the system the event belongs to
4503 *
4504 * This parses the event format and creates an event structure
4505 * to quickly parse raw data for a given event.
4506 *
4507 * These files currently come from:
4508 *
4509 * /sys/kernel/debug/tracing/events/.../.../format
4510 */
4511int pevent_parse_event(struct pevent *pevent,
4512 const char *buf, unsigned long size,
4513 const char *sys)
4514{
4515 struct event_format *event;
4516 int ret;
4517
4518 init_input_buf(buf, size);
4519
4520 event = alloc_event();
4521 if (!event)
4522 return -ENOMEM;
4523
4524 event->name = event_read_name();
4525 if (!event->name) {
4526 /* Bad event? */
4527 free(event);
4528 return -1;
4529 }
4530
4531 if (strcmp(sys, "ftrace") == 0) {
4532
4533 event->flags |= EVENT_FL_ISFTRACE;
4534
4535 if (strcmp(event->name, "bprint") == 0)
4536 event->flags |= EVENT_FL_ISBPRINT;
4537 }
4538
4539 event->id = event_read_id();
4540 if (event->id < 0)
4541 die("failed to read event id");
4542
4543 event->system = strdup(sys);
4544
4545 /* Add pevent to event so that it can be referenced */
4546 event->pevent = pevent;
4547
4548 ret = event_read_format(event);
4549 if (ret < 0) {
4550 do_warning("failed to read event format for %s", event->name);
4551 goto event_failed;
4552 }
4553
4554 /*
4555 * If the event has an override, don't print warnings if the event
4556 * print format fails to parse.
4557 */
4558 if (find_event_handle(pevent, event))
4559 show_warning = 0;
4560
4561 ret = event_read_print(event);
4562 if (ret < 0) {
4563 do_warning("failed to read event print fmt for %s",
4564 event->name);
4565 show_warning = 1;
4566 goto event_failed;
4567 }
4568 show_warning = 1;
4569
4570 add_event(pevent, event);
4571
4572 if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
4573 struct format_field *field;
4574 struct print_arg *arg, **list;
4575
4576 /* old ftrace had no args */
4577
4578 list = &event->print_fmt.args;
4579 for (field = event->format.fields; field; field = field->next) {
4580 arg = alloc_arg();
4581 *list = arg;
4582 list = &arg->next;
4583 arg->type = PRINT_FIELD;
4584 arg->field.name = strdup(field->name);
4585 arg->field.field = field;
4586 }
4587 return 0;
4588 }
4589
4590#define PRINT_ARGS 0
4591 if (PRINT_ARGS && event->print_fmt.args)
4592 print_args(event->print_fmt.args);
4593
4594 return 0;
4595
4596 event_failed:
4597 event->flags |= EVENT_FL_FAILED;
4598 /* still add it even if it failed */
4599 add_event(pevent, event);
4600 return -1;
4601}
4602
4603int get_field_val(struct trace_seq *s, struct format_field *field,
4604 const char *name, struct pevent_record *record,
4605 unsigned long long *val, int err)
4606{
4607 if (!field) {
4608 if (err)
4609 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4610 return -1;
4611 }
4612
4613 if (pevent_read_number_field(field, record->data, val)) {
4614 if (err)
4615 trace_seq_printf(s, " %s=INVALID", name);
4616 return -1;
4617 }
4618
4619 return 0;
4620}
4621
4622/**
4623 * pevent_get_field_raw - return the raw pointer into the data field
4624 * @s: The seq to print to on error
4625 * @event: the event that the field is for
4626 * @name: The name of the field
4627 * @record: The record with the field name.
4628 * @len: place to store the field length.
4629 * @err: print default error if failed.
4630 *
4631 * Returns a pointer into record->data of the field and places
4632 * the length of the field in @len.
4633 *
4634 * On failure, it returns NULL.
4635 */
4636void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
4637 const char *name, struct pevent_record *record,
4638 int *len, int err)
4639{
4640 struct format_field *field;
4641 void *data = record->data;
4642 unsigned offset;
4643 int dummy;
4644
4645 if (!event)
4646 return NULL;
4647
4648 field = pevent_find_field(event, name);
4649
4650 if (!field) {
4651 if (err)
4652 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4653 return NULL;
4654 }
4655
4656 /* Allow @len to be NULL */
4657 if (!len)
4658 len = &dummy;
4659
4660 offset = field->offset;
4661 if (field->flags & FIELD_IS_DYNAMIC) {
4662 offset = pevent_read_number(event->pevent,
4663 data + offset, field->size);
4664 *len = offset >> 16;
4665 offset &= 0xffff;
4666 } else
4667 *len = field->size;
4668
4669 return data + offset;
4670}
4671
4672/**
4673 * pevent_get_field_val - find a field and return its value
4674 * @s: The seq to print to on error
4675 * @event: the event that the field is for
4676 * @name: The name of the field
4677 * @record: The record with the field name.
4678 * @val: place to store the value of the field.
4679 * @err: print default error if failed.
4680 *
4681 * Returns 0 on success -1 on field not found.
4682 */
4683int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
4684 const char *name, struct pevent_record *record,
4685 unsigned long long *val, int err)
4686{
4687 struct format_field *field;
4688
4689 if (!event)
4690 return -1;
4691
4692 field = pevent_find_field(event, name);
4693
4694 return get_field_val(s, field, name, record, val, err);
4695}
4696
4697/**
4698 * pevent_get_common_field_val - find a common field and return its value
4699 * @s: The seq to print to on error
4700 * @event: the event that the field is for
4701 * @name: The name of the field
4702 * @record: The record with the field name.
4703 * @val: place to store the value of the field.
4704 * @err: print default error if failed.
4705 *
4706 * Returns 0 on success -1 on field not found.
4707 */
4708int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
4709 const char *name, struct pevent_record *record,
4710 unsigned long long *val, int err)
4711{
4712 struct format_field *field;
4713
4714 if (!event)
4715 return -1;
4716
4717 field = pevent_find_common_field(event, name);
4718
4719 return get_field_val(s, field, name, record, val, err);
4720}
4721
4722/**
4723 * pevent_get_any_field_val - find a any field and return its value
4724 * @s: The seq to print to on error
4725 * @event: the event that the field is for
4726 * @name: The name of the field
4727 * @record: The record with the field name.
4728 * @val: place to store the value of the field.
4729 * @err: print default error if failed.
4730 *
4731 * Returns 0 on success -1 on field not found.
4732 */
4733int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
4734 const char *name, struct pevent_record *record,
4735 unsigned long long *val, int err)
4736{
4737 struct format_field *field;
4738
4739 if (!event)
4740 return -1;
4741
4742 field = pevent_find_any_field(event, name);
4743
4744 return get_field_val(s, field, name, record, val, err);
4745}
4746
4747/**
4748 * pevent_print_num_field - print a field and a format
4749 * @s: The seq to print to
4750 * @fmt: The printf format to print the field with.
4751 * @event: the event that the field is for
4752 * @name: The name of the field
4753 * @record: The record with the field name.
4754 * @err: print default error if failed.
4755 *
4756 * Returns: 0 on success, -1 field not fould, or 1 if buffer is full.
4757 */
4758int pevent_print_num_field(struct trace_seq *s, const char *fmt,
4759 struct event_format *event, const char *name,
4760 struct pevent_record *record, int err)
4761{
4762 struct format_field *field = pevent_find_field(event, name);
4763 unsigned long long val;
4764
4765 if (!field)
4766 goto failed;
4767
4768 if (pevent_read_number_field(field, record->data, &val))
4769 goto failed;
4770
4771 return trace_seq_printf(s, fmt, val);
4772
4773 failed:
4774 if (err)
4775 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
4776 return -1;
4777}
4778
4779static void free_func_handle(struct pevent_function_handler *func)
4780{
4781 struct pevent_func_params *params;
4782
4783 free(func->name);
4784
4785 while (func->params) {
4786 params = func->params;
4787 func->params = params->next;
4788 free(params);
4789 }
4790
4791 free(func);
4792}
4793
4794/**
4795 * pevent_register_print_function - register a helper function
4796 * @pevent: the handle to the pevent
4797 * @func: the function to process the helper function
4798 * @name: the name of the helper function
4799 * @parameters: A list of enum pevent_func_arg_type
4800 *
4801 * Some events may have helper functions in the print format arguments.
4802 * This allows a plugin to dynmically create a way to process one
4803 * of these functions.
4804 *
4805 * The @parameters is a variable list of pevent_func_arg_type enums that
4806 * must end with PEVENT_FUNC_ARG_VOID.
4807 */
4808int pevent_register_print_function(struct pevent *pevent,
4809 pevent_func_handler func,
4810 enum pevent_func_arg_type ret_type,
4811 char *name, ...)
4812{
4813 struct pevent_function_handler *func_handle;
4814 struct pevent_func_params **next_param;
4815 struct pevent_func_params *param;
4816 enum pevent_func_arg_type type;
4817 va_list ap;
4818
4819 func_handle = find_func_handler(pevent, name);
4820 if (func_handle) {
4821 /*
4822 * This is most like caused by the users own
4823 * plugins updating the function. This overrides the
4824 * system defaults.
4825 */
4826 pr_stat("override of function helper '%s'", name);
4827 remove_func_handler(pevent, name);
4828 }
4829
4830 func_handle = malloc_or_die(sizeof(*func_handle));
4831 memset(func_handle, 0, sizeof(*func_handle));
4832
4833 func_handle->ret_type = ret_type;
4834 func_handle->name = strdup(name);
4835 func_handle->func = func;
4836 if (!func_handle->name)
4837 die("Failed to allocate function name");
4838
4839 next_param = &(func_handle->params);
4840 va_start(ap, name);
4841 for (;;) {
4842 type = va_arg(ap, enum pevent_func_arg_type);
4843 if (type == PEVENT_FUNC_ARG_VOID)
4844 break;
4845
4846 if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
4847 warning("Invalid argument type %d", type);
4848 goto out_free;
4849 }
4850
4851 param = malloc_or_die(sizeof(*param));
4852 param->type = type;
4853 param->next = NULL;
4854
4855 *next_param = param;
4856 next_param = &(param->next);
4857
4858 func_handle->nr_args++;
4859 }
4860 va_end(ap);
4861
4862 func_handle->next = pevent->func_handlers;
4863 pevent->func_handlers = func_handle;
4864
4865 return 0;
4866 out_free:
4867 va_end(ap);
4868 free_func_handle(func_handle);
4869 return -1;
4870}
4871
4872/**
4873 * pevent_register_event_handle - register a way to parse an event
4874 * @pevent: the handle to the pevent
4875 * @id: the id of the event to register
4876 * @sys_name: the system name the event belongs to
4877 * @event_name: the name of the event
4878 * @func: the function to call to parse the event information
4879 *
4880 * This function allows a developer to override the parsing of
4881 * a given event. If for some reason the default print format
4882 * is not sufficient, this function will register a function
4883 * for an event to be used to parse the data instead.
4884 *
4885 * If @id is >= 0, then it is used to find the event.
4886 * else @sys_name and @event_name are used.
4887 */
4888int pevent_register_event_handler(struct pevent *pevent,
4889 int id, char *sys_name, char *event_name,
4890 pevent_event_handler_func func,
4891 void *context)
4892{
4893 struct event_format *event;
4894 struct event_handler *handle;
4895
4896 if (id >= 0) {
4897 /* search by id */
4898 event = pevent_find_event(pevent, id);
4899 if (!event)
4900 goto not_found;
4901 if (event_name && (strcmp(event_name, event->name) != 0))
4902 goto not_found;
4903 if (sys_name && (strcmp(sys_name, event->system) != 0))
4904 goto not_found;
4905 } else {
4906 event = pevent_find_event_by_name(pevent, sys_name, event_name);
4907 if (!event)
4908 goto not_found;
4909 }
4910
4911 pr_stat("overriding event (%d) %s:%s with new print handler",
4912 event->id, event->system, event->name);
4913
4914 event->handler = func;
4915 event->context = context;
4916 return 0;
4917
4918 not_found:
4919 /* Save for later use. */
4920 handle = malloc_or_die(sizeof(*handle));
4921 memset(handle, 0, sizeof(*handle));
4922 handle->id = id;
4923 if (event_name)
4924 handle->event_name = strdup(event_name);
4925 if (sys_name)
4926 handle->sys_name = strdup(sys_name);
4927
4928 handle->func = func;
4929 handle->next = pevent->handlers;
4930 pevent->handlers = handle;
4931 handle->context = context;
4932
4933 return -1;
4934}
4935
4936/**
4937 * pevent_alloc - create a pevent handle
4938 */
4939struct pevent *pevent_alloc(void)
4940{
4941 struct pevent *pevent;
4942
4943 pevent = malloc(sizeof(*pevent));
4944 if (!pevent)
4945 return NULL;
4946 memset(pevent, 0, sizeof(*pevent));
4947 pevent->ref_count = 1;
4948
4949 return pevent;
4950}
4951
4952void pevent_ref(struct pevent *pevent)
4953{
4954 pevent->ref_count++;
4955}
4956
4957static void free_format_fields(struct format_field *field)
4958{
4959 struct format_field *next;
4960
4961 while (field) {
4962 next = field->next;
4963 free(field->type);
4964 free(field->name);
4965 free(field);
4966 field = next;
4967 }
4968}
4969
4970static void free_formats(struct format *format)
4971{
4972 free_format_fields(format->common_fields);
4973 free_format_fields(format->fields);
4974}
4975
4976static void free_event(struct event_format *event)
4977{
4978 free(event->name);
4979 free(event->system);
4980
4981 free_formats(&event->format);
4982
4983 free(event->print_fmt.format);
4984 free_args(event->print_fmt.args);
4985
4986 free(event);
4987}
4988
4989/**
4990 * pevent_free - free a pevent handle
4991 * @pevent: the pevent handle to free
4992 */
4993void pevent_free(struct pevent *pevent)
4994{
4995 struct cmdline_list *cmdlist, *cmdnext;
4996 struct func_list *funclist, *funcnext;
4997 struct printk_list *printklist, *printknext;
4998 struct pevent_function_handler *func_handler;
4999 struct event_handler *handle;
5000 int i;
5001
5002 if (!pevent)
5003 return;
5004
5005 cmdlist = pevent->cmdlist;
5006 funclist = pevent->funclist;
5007 printklist = pevent->printklist;
5008
5009 pevent->ref_count--;
5010 if (pevent->ref_count)
5011 return;
5012
5013 if (pevent->cmdlines) {
5014 for (i = 0; i < pevent->cmdline_count; i++)
5015 free(pevent->cmdlines[i].comm);
5016 free(pevent->cmdlines);
5017 }
5018
5019 while (cmdlist) {
5020 cmdnext = cmdlist->next;
5021 free(cmdlist->comm);
5022 free(cmdlist);
5023 cmdlist = cmdnext;
5024 }
5025
5026 if (pevent->func_map) {
5027 for (i = 0; i < pevent->func_count; i++) {
5028 free(pevent->func_map[i].func);
5029 free(pevent->func_map[i].mod);
5030 }
5031 free(pevent->func_map);
5032 }
5033
5034 while (funclist) {
5035 funcnext = funclist->next;
5036 free(funclist->func);
5037 free(funclist->mod);
5038 free(funclist);
5039 funclist = funcnext;
5040 }
5041
5042 while (pevent->func_handlers) {
5043 func_handler = pevent->func_handlers;
5044 pevent->func_handlers = func_handler->next;
5045 free_func_handle(func_handler);
5046 }
5047
5048 if (pevent->printk_map) {
5049 for (i = 0; i < pevent->printk_count; i++)
5050 free(pevent->printk_map[i].printk);
5051 free(pevent->printk_map);
5052 }
5053
5054 while (printklist) {
5055 printknext = printklist->next;
5056 free(printklist->printk);
5057 free(printklist);
5058 printklist = printknext;
5059 }
5060
5061 for (i = 0; i < pevent->nr_events; i++)
5062 free_event(pevent->events[i]);
5063
5064 while (pevent->handlers) {
5065 handle = pevent->handlers;
5066 pevent->handlers = handle->next;
5067 free_handler(handle);
5068 }
5069
5070 free(pevent->events);
5071 free(pevent->sort_events);
5072
5073 free(pevent);
5074}
5075
5076void pevent_unref(struct pevent *pevent)
5077{
5078 pevent_free(pevent);
5079}