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perf/events: Add flag to produce nsec output
[deliverable/linux.git] / tools / lib / traceevent / event-parse.c
CommitLineData
f7d82350
SR		 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"
668fe01f 36#include "event-utils.h"
f7d82350
SR		 37
38static const char *input_buf;
39static unsigned long long input_buf_ptr;
40static unsigned long long input_buf_siz;
41
42static int show_warning = 1;
43
44#define do_warning(fmt, ...) \
45 do { \
46 if (show_warning) \
47 warning(fmt, ##__VA_ARGS__); \
48 } while (0)
49
50static void init_input_buf(const char *buf, unsigned long long size)
51{
52 input_buf = buf;
53 input_buf_siz = size;
54 input_buf_ptr = 0;
55}
56
57const char *pevent_get_input_buf(void)
58{
59 return input_buf;
60}
61
62unsigned long long pevent_get_input_buf_ptr(void)
63{
64 return input_buf_ptr;
65}
66
67struct event_handler {
68 struct event_handler *next;
69 int id;
70 const char *sys_name;
71 const char *event_name;
72 pevent_event_handler_func func;
73 void *context;
74};
75
76struct pevent_func_params {
77 struct pevent_func_params *next;
78 enum pevent_func_arg_type type;
79};
80
81struct pevent_function_handler {
82 struct pevent_function_handler *next;
83 enum pevent_func_arg_type ret_type;
84 char *name;
85 pevent_func_handler func;
86 struct pevent_func_params *params;
87 int nr_args;
88};
89
90static unsigned long long
91process_defined_func(struct trace_seq *s, void *data, int size,
92 struct event_format *event, struct print_arg *arg);
93
94static void free_func_handle(struct pevent_function_handler *func);
95
96/**
97 * pevent_buffer_init - init buffer for parsing
98 * @buf: buffer to parse
99 * @size: the size of the buffer
100 *
101 * For use with pevent_read_token(), this initializes the internal
102 * buffer that pevent_read_token() will parse.
103 */
104void pevent_buffer_init(const char *buf, unsigned long long size)
105{
106 init_input_buf(buf, size);
107}
108
109void breakpoint(void)
110{
111 static int x;
112 x++;
113}
114
115struct print_arg *alloc_arg(void)
116{
117 struct print_arg *arg;
118
119 arg = malloc_or_die(sizeof(*arg));
120 if (!arg)
121 return NULL;
122 memset(arg, 0, sizeof(*arg));
123
124 return arg;
125}
126
127struct cmdline {
128 char *comm;
129 int pid;
130};
131
132static int cmdline_cmp(const void *a, const void *b)
133{
134 const struct cmdline *ca = a;
135 const struct cmdline *cb = b;
136
137 if (ca->pid < cb->pid)
138 return -1;
139 if (ca->pid > cb->pid)
140 return 1;
141
142 return 0;
143}
144
145struct cmdline_list {
146 struct cmdline_list *next;
147 char *comm;
148 int pid;
149};
150
151static int cmdline_init(struct pevent *pevent)
152{
153 struct cmdline_list *cmdlist = pevent->cmdlist;
154 struct cmdline_list *item;
155 struct cmdline *cmdlines;
156 int i;
157
158 cmdlines = malloc_or_die(sizeof(*cmdlines) * pevent->cmdline_count);
159
160 i = 0;
161 while (cmdlist) {
162 cmdlines[i].pid = cmdlist->pid;
163 cmdlines[i].comm = cmdlist->comm;
164 i++;
165 item = cmdlist;
166 cmdlist = cmdlist->next;
167 free(item);
168 }
169
170 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
171
172 pevent->cmdlines = cmdlines;
173 pevent->cmdlist = NULL;
174
175 return 0;
176}
177
178static char *find_cmdline(struct pevent *pevent, int pid)
179{
180 const struct cmdline *comm;
181 struct cmdline key;
182
183 if (!pid)
184 return "<idle>";
185
186 if (!pevent->cmdlines)
187 cmdline_init(pevent);
188
189 key.pid = pid;
190
191 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
192 sizeof(*pevent->cmdlines), cmdline_cmp);
193
194 if (comm)
195 return comm->comm;
196 return "<...>";
197}
198
199/**
200 * pevent_pid_is_registered - return if a pid has a cmdline registered
201 * @pevent: handle for the pevent
202 * @pid: The pid to check if it has a cmdline registered with.
203 *
204 * Returns 1 if the pid has a cmdline mapped to it
205 * 0 otherwise.
206 */
207int pevent_pid_is_registered(struct pevent *pevent, int pid)
208{
209 const struct cmdline *comm;
210 struct cmdline key;
211
212 if (!pid)
213 return 1;
214
215 if (!pevent->cmdlines)
216 cmdline_init(pevent);
217
218 key.pid = pid;
219
220 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
221 sizeof(*pevent->cmdlines), cmdline_cmp);
222
223 if (comm)
224 return 1;
225 return 0;
226}
227
228/*
229 * If the command lines have been converted to an array, then
230 * we must add this pid. This is much slower than when cmdlines
231 * are added before the array is initialized.
232 */
233static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
234{
235 struct cmdline *cmdlines = pevent->cmdlines;
236 const struct cmdline *cmdline;
237 struct cmdline key;
238
239 if (!pid)
240 return 0;
241
242 /* avoid duplicates */
243 key.pid = pid;
244
245 cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
246 sizeof(*pevent->cmdlines), cmdline_cmp);
247 if (cmdline) {
248 errno = EEXIST;
249 return -1;
250 }
251
252 cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
253 if (!cmdlines) {
254 errno = ENOMEM;
255 return -1;
256 }
257
258 cmdlines[pevent->cmdline_count].pid = pid;
259 cmdlines[pevent->cmdline_count].comm = strdup(comm);
260 if (!cmdlines[pevent->cmdline_count].comm)
261 die("malloc comm");
262
263 if (cmdlines[pevent->cmdline_count].comm)
264 pevent->cmdline_count++;
265
266 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
267 pevent->cmdlines = cmdlines;
268
269 return 0;
270}
271
272/**
273 * pevent_register_comm - register a pid / comm mapping
274 * @pevent: handle for the pevent
275 * @comm: the command line to register
276 * @pid: the pid to map the command line to
277 *
278 * This adds a mapping to search for command line names with
279 * a given pid. The comm is duplicated.
280 */
281int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
282{
283 struct cmdline_list *item;
284
285 if (pevent->cmdlines)
286 return add_new_comm(pevent, comm, pid);
287
288 item = malloc_or_die(sizeof(*item));
289 item->comm = strdup(comm);
290 if (!item->comm)
291 die("malloc comm");
292 item->pid = pid;
293 item->next = pevent->cmdlist;
294
295 pevent->cmdlist = item;
296 pevent->cmdline_count++;
297
298 return 0;
299}
300
301struct func_map {
302 unsigned long long addr;
303 char *func;
304 char *mod;
305};
306
307struct func_list {
308 struct func_list *next;
309 unsigned long long addr;
310 char *func;
311 char *mod;
312};
313
314static int func_cmp(const void *a, const void *b)
315{
316 const struct func_map *fa = a;
317 const struct func_map *fb = b;
318
319 if (fa->addr < fb->addr)
320 return -1;
321 if (fa->addr > fb->addr)
322 return 1;
323
324 return 0;
325}
326
327/*
328 * We are searching for a record in between, not an exact
329 * match.
330 */
331static int func_bcmp(const void *a, const void *b)
332{
333 const struct func_map *fa = a;
334 const struct func_map *fb = b;
335
336 if ((fa->addr == fb->addr) ||
337
338 (fa->addr > fb->addr &&
339 fa->addr < (fb+1)->addr))
340 return 0;
341
342 if (fa->addr < fb->addr)
343 return -1;
344
345 return 1;
346}
347
348static int func_map_init(struct pevent *pevent)
349{
350 struct func_list *funclist;
351 struct func_list *item;
352 struct func_map *func_map;
353 int i;
354
355 func_map = malloc_or_die(sizeof(*func_map) * (pevent->func_count + 1));
356 funclist = pevent->funclist;
357
358 i = 0;
359 while (funclist) {
360 func_map[i].func = funclist->func;
361 func_map[i].addr = funclist->addr;
362 func_map[i].mod = funclist->mod;
363 i++;
364 item = funclist;
365 funclist = funclist->next;
366 free(item);
367 }
368
369 qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
370
371 /*
372 * Add a special record at the end.
373 */
374 func_map[pevent->func_count].func = NULL;
375 func_map[pevent->func_count].addr = 0;
376 func_map[pevent->func_count].mod = NULL;
377
378 pevent->func_map = func_map;
379 pevent->funclist = NULL;
380
381 return 0;
382}
383
384static struct func_map *
385find_func(struct pevent *pevent, unsigned long long addr)
386{
387 struct func_map *func;
388 struct func_map key;
389
390 if (!pevent->func_map)
391 func_map_init(pevent);
392
393 key.addr = addr;
394
395 func = bsearch(&key, pevent->func_map, pevent->func_count,
396 sizeof(*pevent->func_map), func_bcmp);
397
398 return func;
399}
400
401/**
402 * pevent_find_function - find a function by a given address
403 * @pevent: handle for the pevent
404 * @addr: the address to find the function with
405 *
406 * Returns a pointer to the function stored that has the given
407 * address. Note, the address does not have to be exact, it
408 * will select the function that would contain the address.
409 */
410const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
411{
412 struct func_map *map;
413
414 map = find_func(pevent, addr);
415 if (!map)
416 return NULL;
417
418 return map->func;
419}
420
421/**
422 * pevent_find_function_address - find a function address by a given address
423 * @pevent: handle for the pevent
424 * @addr: the address to find the function with
425 *
426 * Returns the address the function starts at. This can be used in
427 * conjunction with pevent_find_function to print both the function
428 * name and the function offset.
429 */
430unsigned long long
431pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
432{
433 struct func_map *map;
434
435 map = find_func(pevent, addr);
436 if (!map)
437 return 0;
438
439 return map->addr;
440}
441
442/**
443 * pevent_register_function - register a function with a given address
444 * @pevent: handle for the pevent
445 * @function: the function name to register
446 * @addr: the address the function starts at
447 * @mod: the kernel module the function may be in (NULL for none)
448 *
449 * This registers a function name with an address and module.
450 * The @func passed in is duplicated.
451 */
452int pevent_register_function(struct pevent *pevent, char *func,
453 unsigned long long addr, char *mod)
454{
455 struct func_list *item;
456
457 item = malloc_or_die(sizeof(*item));
458
459 item->next = pevent->funclist;
460 item->func = strdup(func);
461 if (mod)
462 item->mod = strdup(mod);
463 else
464 item->mod = NULL;
465 item->addr = addr;
466
467 pevent->funclist = item;
468
469 pevent->func_count++;
470
471 return 0;
472}
473
474/**
475 * pevent_print_funcs - print out the stored functions
476 * @pevent: handle for the pevent
477 *
478 * This prints out the stored functions.
479 */
480void pevent_print_funcs(struct pevent *pevent)
481{
482 int i;
483
484 if (!pevent->func_map)
485 func_map_init(pevent);
486
487 for (i = 0; i < (int)pevent->func_count; i++) {
488 printf("%016llx %s",
489 pevent->func_map[i].addr,
490 pevent->func_map[i].func);
491 if (pevent->func_map[i].mod)
492 printf(" [%s]\n", pevent->func_map[i].mod);
493 else
494 printf("\n");
495 }
496}
497
498struct printk_map {
499 unsigned long long addr;
500 char *printk;
501};
502
503struct printk_list {
504 struct printk_list *next;
505 unsigned long long addr;
506 char *printk;
507};
508
509static int printk_cmp(const void *a, const void *b)
510{
511 const struct func_map *fa = a;
512 const struct func_map *fb = b;
513
514 if (fa->addr < fb->addr)
515 return -1;
516 if (fa->addr > fb->addr)
517 return 1;
518
519 return 0;
520}
521
522static void printk_map_init(struct pevent *pevent)
523{
524 struct printk_list *printklist;
525 struct printk_list *item;
526 struct printk_map *printk_map;
527 int i;
528
529 printk_map = malloc_or_die(sizeof(*printk_map) * (pevent->printk_count + 1));
530
531 printklist = pevent->printklist;
532
533 i = 0;
534 while (printklist) {
535 printk_map[i].printk = printklist->printk;
536 printk_map[i].addr = printklist->addr;
537 i++;
538 item = printklist;
539 printklist = printklist->next;
540 free(item);
541 }
542
543 qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
544
545 pevent->printk_map = printk_map;
546 pevent->printklist = NULL;
547}
548
549static struct printk_map *
550find_printk(struct pevent *pevent, unsigned long long addr)
551{
552 struct printk_map *printk;
553 struct printk_map key;
554
555 if (!pevent->printk_map)
556 printk_map_init(pevent);
557
558 key.addr = addr;
559
560 printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
561 sizeof(*pevent->printk_map), printk_cmp);
562
563 return printk;
564}
565
566/**
567 * pevent_register_print_string - register a string by its address
568 * @pevent: handle for the pevent
569 * @fmt: the string format to register
570 * @addr: the address the string was located at
571 *
572 * This registers a string by the address it was stored in the kernel.
573 * The @fmt passed in is duplicated.
574 */
575int pevent_register_print_string(struct pevent *pevent, char *fmt,
576 unsigned long long addr)
577{
578 struct printk_list *item;
579
580 item = malloc_or_die(sizeof(*item));
581
582 item->next = pevent->printklist;
583 pevent->printklist = item;
584 item->printk = strdup(fmt);
585 item->addr = addr;
586
587 pevent->printk_count++;
588
589 return 0;
590}
591
592/**
593 * pevent_print_printk - print out the stored strings
594 * @pevent: handle for the pevent
595 *
596 * This prints the string formats that were stored.
597 */
598void pevent_print_printk(struct pevent *pevent)
599{
600 int i;
601
602 if (!pevent->printk_map)
603 printk_map_init(pevent);
604
605 for (i = 0; i < (int)pevent->printk_count; i++) {
606 printf("%016llx %s\n",
607 pevent->printk_map[i].addr,
608 pevent->printk_map[i].printk);
609 }
610}
611
612static struct event_format *alloc_event(void)
613{
614 struct event_format *event;
615
616 event = malloc_or_die(sizeof(*event));
617 memset(event, 0, sizeof(*event));
618
619 return event;
620}
621
622static void add_event(struct pevent *pevent, struct event_format *event)
623{
624 int i;
625
626 if (!pevent->events)
627 pevent->events = malloc_or_die(sizeof(event));
628 else
629 pevent->events =
630 realloc(pevent->events, sizeof(event) *
631 (pevent->nr_events + 1));
632 if (!pevent->events)
633 die("Can not allocate events");
634
635 for (i = 0; i < pevent->nr_events; i++) {
636 if (pevent->events[i]->id > event->id)
637 break;
638 }
639 if (i < pevent->nr_events)
640 memmove(&pevent->events[i + 1],
641 &pevent->events[i],
642 sizeof(event) * (pevent->nr_events - i));
643
644 pevent->events[i] = event;
645 pevent->nr_events++;
646
647 event->pevent = pevent;
648}
649
650static int event_item_type(enum event_type type)
651{
652 switch (type) {
653 case EVENT_ITEM ... EVENT_SQUOTE:
654 return 1;
655 case EVENT_ERROR ... EVENT_DELIM:
656 default:
657 return 0;
658 }
659}
660
661static void free_flag_sym(struct print_flag_sym *fsym)
662{
663 struct print_flag_sym *next;
664
665 while (fsym) {
666 next = fsym->next;
667 free(fsym->value);
668 free(fsym->str);
669 free(fsym);
670 fsym = next;
671 }
672}
673
674static void free_arg(struct print_arg *arg)
675{
676 struct print_arg *farg;
677
678 if (!arg)
679 return;
680
681 switch (arg->type) {
682 case PRINT_ATOM:
683 free(arg->atom.atom);
684 break;
685 case PRINT_FIELD:
686 free(arg->field.name);
687 break;
688 case PRINT_FLAGS:
689 free_arg(arg->flags.field);
690 free(arg->flags.delim);
691 free_flag_sym(arg->flags.flags);
692 break;
693 case PRINT_SYMBOL:
694 free_arg(arg->symbol.field);
695 free_flag_sym(arg->symbol.symbols);
696 break;
697 case PRINT_TYPE:
698 free(arg->typecast.type);
699 free_arg(arg->typecast.item);
700 break;
701 case PRINT_STRING:
702 case PRINT_BSTRING:
703 free(arg->string.string);
704 break;
705 case PRINT_DYNAMIC_ARRAY:
706 free(arg->dynarray.index);
707 break;
708 case PRINT_OP:
709 free(arg->op.op);
710 free_arg(arg->op.left);
711 free_arg(arg->op.right);
712 break;
713 case PRINT_FUNC:
714 while (arg->func.args) {
715 farg = arg->func.args;
716 arg->func.args = farg->next;
717 free_arg(farg);
718 }
719 break;
720
721 case PRINT_NULL:
722 default:
723 break;
724 }
725
726 free(arg);
727}
728
729static enum event_type get_type(int ch)
730{
731 if (ch == '\n')
732 return EVENT_NEWLINE;
733 if (isspace(ch))
734 return EVENT_SPACE;
735 if (isalnum(ch) || ch == '_')
736 return EVENT_ITEM;
737 if (ch == '\'')
738 return EVENT_SQUOTE;
739 if (ch == '"')
740 return EVENT_DQUOTE;
741 if (!isprint(ch))
742 return EVENT_NONE;
743 if (ch == '(' || ch == ')' || ch == ',')
744 return EVENT_DELIM;
745
746 return EVENT_OP;
747}
748
749static int __read_char(void)
750{
751 if (input_buf_ptr >= input_buf_siz)
752 return -1;
753
754 return input_buf[input_buf_ptr++];
755}
756
757static int __peek_char(void)
758{
759 if (input_buf_ptr >= input_buf_siz)
760 return -1;
761
762 return input_buf[input_buf_ptr];
763}
764
765/**
766 * pevent_peek_char - peek at the next character that will be read
767 *
768 * Returns the next character read, or -1 if end of buffer.
769 */
770int pevent_peek_char(void)
771{
772 return __peek_char();
773}
774
775static enum event_type force_token(const char *str, char **tok);
776
777static enum event_type __read_token(char **tok)
778{
779 char buf[BUFSIZ];
780 int ch, last_ch, quote_ch, next_ch;
781 int i = 0;
782 int tok_size = 0;
783 enum event_type type;
784
785 *tok = NULL;
786
787
788 ch = __read_char();
789 if (ch < 0)
790 return EVENT_NONE;
791
792 type = get_type(ch);
793 if (type == EVENT_NONE)
794 return type;
795
796 buf[i++] = ch;
797
798 switch (type) {
799 case EVENT_NEWLINE:
800 case EVENT_DELIM:
801 *tok = malloc_or_die(2);
802 (*tok)[0] = ch;
803 (*tok)[1] = 0;
804 return type;
805
806 case EVENT_OP:
807 switch (ch) {
808 case '-':
809 next_ch = __peek_char();
810 if (next_ch == '>') {
811 buf[i++] = __read_char();
812 break;
813 }
814 /* fall through */
815 case '+':
816 case '|':
817 case '&':
818 case '>':
819 case '<':
820 last_ch = ch;
821 ch = __peek_char();
822 if (ch != last_ch)
823 goto test_equal;
824 buf[i++] = __read_char();
825 switch (last_ch) {
826 case '>':
827 case '<':
828 goto test_equal;
829 default:
830 break;
831 }
832 break;
833 case '!':
834 case '=':
835 goto test_equal;
836 default: /* what should we do instead? */
837 break;
838 }
839 buf[i] = 0;
840 *tok = strdup(buf);
841 return type;
842
843 test_equal:
844 ch = __peek_char();
845 if (ch == '=')
846 buf[i++] = __read_char();
847 goto out;
848
849 case EVENT_DQUOTE:
850 case EVENT_SQUOTE:
851 /* don't keep quotes */
852 i--;
853 quote_ch = ch;
854 last_ch = 0;
855 concat:
856 do {
857 if (i == (BUFSIZ - 1)) {
858 buf[i] = 0;
859 if (*tok) {
860 *tok = realloc(*tok, tok_size + BUFSIZ);
861 if (!*tok)
862 return EVENT_NONE;
863 strcat(*tok, buf);
864 } else
865 *tok = strdup(buf);
866
867 if (!*tok)
868 return EVENT_NONE;
869 tok_size += BUFSIZ;
870 i = 0;
871 }
872 last_ch = ch;
873 ch = __read_char();
874 buf[i++] = ch;
875 /* the '\' '\' will cancel itself */
876 if (ch == '\\' && last_ch == '\\')
877 last_ch = 0;
878 } while (ch != quote_ch || last_ch == '\\');
879 /* remove the last quote */
880 i--;
881
882 /*
883 * For strings (double quotes) check the next token.
884 * If it is another string, concatinate the two.
885 */
886 if (type == EVENT_DQUOTE) {
887 unsigned long long save_input_buf_ptr = input_buf_ptr;
888
889 do {
890 ch = __read_char();
891 } while (isspace(ch));
892 if (ch == '"')
893 goto concat;
894 input_buf_ptr = save_input_buf_ptr;
895 }
896
897 goto out;
898
899 case EVENT_ERROR ... EVENT_SPACE:
900 case EVENT_ITEM:
901 default:
902 break;
903 }
904
905 while (get_type(__peek_char()) == type) {
906 if (i == (BUFSIZ - 1)) {
907 buf[i] = 0;
908 if (*tok) {
909 *tok = realloc(*tok, tok_size + BUFSIZ);
910 if (!*tok)
911 return EVENT_NONE;
912 strcat(*tok, buf);
913 } else
914 *tok = strdup(buf);
915
916 if (!*tok)
917 return EVENT_NONE;
918 tok_size += BUFSIZ;
919 i = 0;
920 }
921 ch = __read_char();
922 buf[i++] = ch;
923 }
924
925 out:
926 buf[i] = 0;
927 if (*tok) {
928 *tok = realloc(*tok, tok_size + i);
929 if (!*tok)
930 return EVENT_NONE;
931 strcat(*tok, buf);
932 } else
933 *tok = strdup(buf);
934 if (!*tok)
935 return EVENT_NONE;
936
937 if (type == EVENT_ITEM) {
938 /*
939 * Older versions of the kernel has a bug that
940 * creates invalid symbols and will break the mac80211
941 * parsing. This is a work around to that bug.
942 *
943 * See Linux kernel commit:
944 * 811cb50baf63461ce0bdb234927046131fc7fa8b
945 */
946 if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
947 free(*tok);
948 *tok = NULL;
949 return force_token("\"\%s\" ", tok);
950 } else if (strcmp(*tok, "STA_PR_FMT") == 0) {
951 free(*tok);
952 *tok = NULL;
953 return force_token("\" sta:%pM\" ", tok);
954 } else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
955 free(*tok);
956 *tok = NULL;
957 return force_token("\" vif:%p(%d)\" ", tok);
958 }
959 }
960
961 return type;
962}
963
964static enum event_type force_token(const char *str, char **tok)
965{
966 const char *save_input_buf;
967 unsigned long long save_input_buf_ptr;
968 unsigned long long save_input_buf_siz;
969 enum event_type type;
970
971 /* save off the current input pointers */
972 save_input_buf = input_buf;
973 save_input_buf_ptr = input_buf_ptr;
974 save_input_buf_siz = input_buf_siz;
975
976 init_input_buf(str, strlen(str));
977
978 type = __read_token(tok);
979
980 /* reset back to original token */
981 input_buf = save_input_buf;
982 input_buf_ptr = save_input_buf_ptr;
983 input_buf_siz = save_input_buf_siz;
984
985 return type;
986}
987
988static void free_token(char *tok)
989{
990 if (tok)
991 free(tok);
992}
993
994static enum event_type read_token(char **tok)
995{
996 enum event_type type;
997
998 for (;;) {
999 type = __read_token(tok);
1000 if (type != EVENT_SPACE)
1001 return type;
1002
1003 free_token(*tok);
1004 }
1005
1006 /* not reached */
1007 *tok = NULL;
1008 return EVENT_NONE;
1009}
1010
1011/**
1012 * pevent_read_token - access to utilites to use the pevent parser
1013 * @tok: The token to return
1014 *
1015 * This will parse tokens from the string given by
1016 * pevent_init_data().
1017 *
1018 * Returns the token type.
1019 */
1020enum event_type pevent_read_token(char **tok)
1021{
1022 return read_token(tok);
1023}
1024
1025/**
1026 * pevent_free_token - free a token returned by pevent_read_token
1027 * @token: the token to free
1028 */
1029void pevent_free_token(char *token)
1030{
1031 free_token(token);
1032}
1033
1034/* no newline */
1035static enum event_type read_token_item(char **tok)
1036{
1037 enum event_type type;
1038
1039 for (;;) {
1040 type = __read_token(tok);
1041 if (type != EVENT_SPACE && type != EVENT_NEWLINE)
1042 return type;
1043 free_token(*tok);
1044 *tok = NULL;
1045 }
1046
1047 /* not reached */
1048 *tok = NULL;
1049 return EVENT_NONE;
1050}
1051
1052static int test_type(enum event_type type, enum event_type expect)
1053{
1054 if (type != expect) {
1055 do_warning("Error: expected type %d but read %d",
1056 expect, type);
1057 return -1;
1058 }
1059 return 0;
1060}
1061
1062static int test_type_token(enum event_type type, const char *token,
1063 enum event_type expect, const char *expect_tok)
1064{
1065 if (type != expect) {
1066 do_warning("Error: expected type %d but read %d",
1067 expect, type);
1068 return -1;
1069 }
1070
1071 if (strcmp(token, expect_tok) != 0) {
1072 do_warning("Error: expected '%s' but read '%s'",
1073 expect_tok, token);
1074 return -1;
1075 }
1076 return 0;
1077}
1078
1079static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
1080{
1081 enum event_type type;
1082
1083 if (newline_ok)
1084 type = read_token(tok);
1085 else
1086 type = read_token_item(tok);
1087 return test_type(type, expect);
1088}
1089
1090static int read_expect_type(enum event_type expect, char **tok)
1091{
1092 return __read_expect_type(expect, tok, 1);
1093}
1094
1095static int __read_expected(enum event_type expect, const char *str,
1096 int newline_ok)
1097{
1098 enum event_type type;
1099 char *token;
1100 int ret;
1101
1102 if (newline_ok)
1103 type = read_token(&token);
1104 else
1105 type = read_token_item(&token);
1106
1107 ret = test_type_token(type, token, expect, str);
1108
1109 free_token(token);
1110
1111 return ret;
1112}
1113
1114static int read_expected(enum event_type expect, const char *str)
1115{
1116 return __read_expected(expect, str, 1);
1117}
1118
1119static int read_expected_item(enum event_type expect, const char *str)
1120{
1121 return __read_expected(expect, str, 0);
1122}
1123
1124static char *event_read_name(void)
1125{
1126 char *token;
1127
1128 if (read_expected(EVENT_ITEM, "name") < 0)
1129 return NULL;
1130
1131 if (read_expected(EVENT_OP, ":") < 0)
1132 return NULL;
1133
1134 if (read_expect_type(EVENT_ITEM, &token) < 0)
1135 goto fail;
1136
1137 return token;
1138
1139 fail:
1140 free_token(token);
1141 return NULL;
1142}
1143
1144static int event_read_id(void)
1145{
1146 char *token;
1147 int id;
1148
1149 if (read_expected_item(EVENT_ITEM, "ID") < 0)
1150 return -1;
1151
1152 if (read_expected(EVENT_OP, ":") < 0)
1153 return -1;
1154
1155 if (read_expect_type(EVENT_ITEM, &token) < 0)
1156 goto fail;
1157
1158 id = strtoul(token, NULL, 0);
1159 free_token(token);
1160 return id;
1161
1162 fail:
1163 free_token(token);
1164 return -1;
1165}
1166
1167static int field_is_string(struct format_field *field)
1168{
1169 if ((field->flags & FIELD_IS_ARRAY) &&
1170 (strstr(field->type, "char") || strstr(field->type, "u8") ||
1171 strstr(field->type, "s8")))
1172 return 1;
1173
1174 return 0;
1175}
1176
1177static int field_is_dynamic(struct format_field *field)
1178{
1179 if (strncmp(field->type, "__data_loc", 10) == 0)
1180 return 1;
1181
1182 return 0;
1183}
1184
1185static int field_is_long(struct format_field *field)
1186{
1187 /* includes long long */
1188 if (strstr(field->type, "long"))
1189 return 1;
1190
1191 return 0;
1192}
1193
1194static int event_read_fields(struct event_format *event, struct format_field **fields)
1195{
1196 struct format_field *field = NULL;
1197 enum event_type type;
1198 char *token;
1199 char *last_token;
1200 int count = 0;
1201
1202 do {
1203 type = read_token(&token);
1204 if (type == EVENT_NEWLINE) {
1205 free_token(token);
1206 return count;
1207 }
1208
1209 count++;
1210
1211 if (test_type_token(type, token, EVENT_ITEM, "field"))
1212 goto fail;
1213 free_token(token);
1214
1215 type = read_token(&token);
1216 /*
1217 * The ftrace fields may still use the "special" name.
1218 * Just ignore it.
1219 */
1220 if (event->flags & EVENT_FL_ISFTRACE &&
1221 type == EVENT_ITEM && strcmp(token, "special") == 0) {
1222 free_token(token);
1223 type = read_token(&token);
1224 }
1225
1226 if (test_type_token(type, token, EVENT_OP, ":") < 0)
1227 goto fail;
1228
1229 free_token(token);
1230 if (read_expect_type(EVENT_ITEM, &token) < 0)
1231 goto fail;
1232
1233 last_token = token;
1234
1235 field = malloc_or_die(sizeof(*field));
1236 memset(field, 0, sizeof(*field));
1237 field->event = event;
1238
1239 /* read the rest of the type */
1240 for (;;) {
1241 type = read_token(&token);
1242 if (type == EVENT_ITEM ||
1243 (type == EVENT_OP && strcmp(token, "*") == 0) ||
1244 /*
1245 * Some of the ftrace fields are broken and have
1246 * an illegal "." in them.
1247 */
1248 (event->flags & EVENT_FL_ISFTRACE &&
1249 type == EVENT_OP && strcmp(token, ".") == 0)) {
1250
1251 if (strcmp(token, "*") == 0)
1252 field->flags |= FIELD_IS_POINTER;
1253
1254 if (field->type) {
1255 field->type = realloc(field->type,
1256 strlen(field->type) +
1257 strlen(last_token) + 2);
1258 strcat(field->type, " ");
1259 strcat(field->type, last_token);
1260 free(last_token);
1261 } else
1262 field->type = last_token;
1263 last_token = token;
1264 continue;
1265 }
1266
1267 break;
1268 }
1269
1270 if (!field->type) {
1271 die("no type found");
1272 goto fail;
1273 }
1274 field->name = last_token;
1275
1276 if (test_type(type, EVENT_OP))
1277 goto fail;
1278
1279 if (strcmp(token, "[") == 0) {
1280 enum event_type last_type = type;
1281 char *brackets = token;
1282 int len;
1283
1284 field->flags |= FIELD_IS_ARRAY;
1285
1286 type = read_token(&token);
1287
1288 if (type == EVENT_ITEM)
1289 field->arraylen = strtoul(token, NULL, 0);
1290 else
1291 field->arraylen = 0;
1292
1293 while (strcmp(token, "]") != 0) {
1294 if (last_type == EVENT_ITEM &&
1295 type == EVENT_ITEM)
1296 len = 2;
1297 else
1298 len = 1;
1299 last_type = type;
1300
1301 brackets = realloc(brackets,
1302 strlen(brackets) +
1303 strlen(token) + len);
1304 if (len == 2)
1305 strcat(brackets, " ");
1306 strcat(brackets, token);
1307 /* We only care about the last token */
1308 field->arraylen = strtoul(token, NULL, 0);
1309 free_token(token);
1310 type = read_token(&token);
1311 if (type == EVENT_NONE) {
1312 die("failed to find token");
1313 goto fail;
1314 }
1315 }
1316
1317 free_token(token);
1318
1319 brackets = realloc(brackets, strlen(brackets) + 2);
1320 strcat(brackets, "]");
1321
1322 /* add brackets to type */
1323
1324 type = read_token(&token);
1325 /*
1326 * If the next token is not an OP, then it is of
1327 * the format: type [] item;
1328 */
1329 if (type == EVENT_ITEM) {
1330 field->type = realloc(field->type,
1331 strlen(field->type) +
1332 strlen(field->name) +
1333 strlen(brackets) + 2);
1334 strcat(field->type, " ");
1335 strcat(field->type, field->name);
1336 free_token(field->name);
1337 strcat(field->type, brackets);
1338 field->name = token;
1339 type = read_token(&token);
1340 } else {
1341 field->type = realloc(field->type,
1342 strlen(field->type) +
1343 strlen(brackets) + 1);
1344 strcat(field->type, brackets);
1345 }
1346 free(brackets);
1347 }
1348
1349 if (field_is_string(field))
1350 field->flags |= FIELD_IS_STRING;
1351 if (field_is_dynamic(field))
1352 field->flags |= FIELD_IS_DYNAMIC;
1353 if (field_is_long(field))
1354 field->flags |= FIELD_IS_LONG;
1355
1356 if (test_type_token(type, token, EVENT_OP, ";"))
1357 goto fail;
1358 free_token(token);
1359
1360 if (read_expected(EVENT_ITEM, "offset") < 0)
1361 goto fail_expect;
1362
1363 if (read_expected(EVENT_OP, ":") < 0)
1364 goto fail_expect;
1365
1366 if (read_expect_type(EVENT_ITEM, &token))
1367 goto fail;
1368 field->offset = strtoul(token, NULL, 0);
1369 free_token(token);
1370
1371 if (read_expected(EVENT_OP, ";") < 0)
1372 goto fail_expect;
1373
1374 if (read_expected(EVENT_ITEM, "size") < 0)
1375 goto fail_expect;
1376
1377 if (read_expected(EVENT_OP, ":") < 0)
1378 goto fail_expect;
1379
1380 if (read_expect_type(EVENT_ITEM, &token))
1381 goto fail;
1382 field->size = strtoul(token, NULL, 0);
1383 free_token(token);
1384
1385 if (read_expected(EVENT_OP, ";") < 0)
1386 goto fail_expect;
1387
1388 type = read_token(&token);
1389 if (type != EVENT_NEWLINE) {
1390 /* newer versions of the kernel have a "signed" type */
1391 if (test_type_token(type, token, EVENT_ITEM, "signed"))
1392 goto fail;
1393
1394 free_token(token);
1395
1396 if (read_expected(EVENT_OP, ":") < 0)
1397 goto fail_expect;
1398
1399 if (read_expect_type(EVENT_ITEM, &token))
1400 goto fail;
1401
1402 /* add signed type */
1403
1404 free_token(token);
1405 if (read_expected(EVENT_OP, ";") < 0)
1406 goto fail_expect;
1407
1408 if (read_expect_type(EVENT_NEWLINE, &token))
1409 goto fail;
1410 }
1411
1412 free_token(token);
1413
1414 if (field->flags & FIELD_IS_ARRAY) {
1415 if (field->arraylen)
1416 field->elementsize = field->size / field->arraylen;
1417 else if (field->flags & FIELD_IS_STRING)
1418 field->elementsize = 1;
1419 else
1420 field->elementsize = event->pevent->long_size;
1421 } else
1422 field->elementsize = field->size;
1423
1424 *fields = field;
1425 fields = &field->next;
1426
1427 } while (1);
1428
1429 return 0;
1430
1431fail:
1432 free_token(token);
1433fail_expect:
1434 if (field)
1435 free(field);
1436 return -1;
1437}
1438
1439static int event_read_format(struct event_format *event)
1440{
1441 char *token;
1442 int ret;
1443
1444 if (read_expected_item(EVENT_ITEM, "format") < 0)
1445 return -1;
1446
1447 if (read_expected(EVENT_OP, ":") < 0)
1448 return -1;
1449
1450 if (read_expect_type(EVENT_NEWLINE, &token))
1451 goto fail;
1452 free_token(token);
1453
1454 ret = event_read_fields(event, &event->format.common_fields);
1455 if (ret < 0)
1456 return ret;
1457 event->format.nr_common = ret;
1458
1459 ret = event_read_fields(event, &event->format.fields);
1460 if (ret < 0)
1461 return ret;
1462 event->format.nr_fields = ret;
1463
1464 return 0;
1465
1466 fail:
1467 free_token(token);
1468 return -1;
1469}
1470
1471static enum event_type
1472process_arg_token(struct event_format *event, struct print_arg *arg,
1473 char **tok, enum event_type type);
1474
1475static enum event_type
1476process_arg(struct event_format *event, struct print_arg *arg, char **tok)
1477{
1478 enum event_type type;
1479 char *token;
1480
1481 type = read_token(&token);
1482 *tok = token;
1483
1484 return process_arg_token(event, arg, tok, type);
1485}
1486
1487static enum event_type
1488process_op(struct event_format *event, struct print_arg *arg, char **tok);
1489
1490static enum event_type
1491process_cond(struct event_format *event, struct print_arg *top, char **tok)
1492{
1493 struct print_arg *arg, *left, *right;
1494 enum event_type type;
1495 char *token = NULL;
1496
1497 arg = alloc_arg();
1498 left = alloc_arg();
1499 right = alloc_arg();
1500
1501 arg->type = PRINT_OP;
1502 arg->op.left = left;
1503 arg->op.right = right;
1504
1505 *tok = NULL;
1506 type = process_arg(event, left, &token);
1507
1508 again:
1509 /* Handle other operations in the arguments */
1510 if (type == EVENT_OP && strcmp(token, ":") != 0) {
1511 type = process_op(event, left, &token);
1512 goto again;
1513 }
1514
1515 if (test_type_token(type, token, EVENT_OP, ":"))
1516 goto out_free;
1517
1518 arg->op.op = token;
1519
1520 type = process_arg(event, right, &token);
1521
1522 top->op.right = arg;
1523
1524 *tok = token;
1525 return type;
1526
1527out_free:
1528 /* Top may point to itself */
1529 top->op.right = NULL;
1530 free_token(token);
1531 free_arg(arg);
1532 return EVENT_ERROR;
1533}
1534
1535static enum event_type
1536process_array(struct event_format *event, struct print_arg *top, char **tok)
1537{
1538 struct print_arg *arg;
1539 enum event_type type;
1540 char *token = NULL;
1541
1542 arg = alloc_arg();
1543
1544 *tok = NULL;
1545 type = process_arg(event, arg, &token);
1546 if (test_type_token(type, token, EVENT_OP, "]"))
1547 goto out_free;
1548
1549 top->op.right = arg;
1550
1551 free_token(token);
1552 type = read_token_item(&token);
1553 *tok = token;
1554
1555 return type;
1556
1557out_free:
1558 free_token(*tok);
1559 *tok = NULL;
1560 free_arg(arg);
1561 return EVENT_ERROR;
1562}
1563
1564static int get_op_prio(char *op)
1565{
1566 if (!op[1]) {
1567 switch (op[0]) {
1568 case '~':
1569 case '!':
1570 return 4;
1571 case '*':
1572 case '/':
1573 case '%':
1574 return 6;
1575 case '+':
1576 case '-':
1577 return 7;
1578 /* '>>' and '<<' are 8 */
1579 case '<':
1580 case '>':
1581 return 9;
1582 /* '==' and '!=' are 10 */
1583 case '&':
1584 return 11;
1585 case '^':
1586 return 12;
1587 case '|':
1588 return 13;
1589 case '?':
1590 return 16;
1591 default:
1592 die("unknown op '%c'", op[0]);
1593 return -1;
1594 }
1595 } else {
1596 if (strcmp(op, "++") == 0 ||
1597 strcmp(op, "--") == 0) {
1598 return 3;
1599 } else if (strcmp(op, ">>") == 0 ||
1600 strcmp(op, "<<") == 0) {
1601 return 8;
1602 } else if (strcmp(op, ">=") == 0 ||
1603 strcmp(op, "<=") == 0) {
1604 return 9;
1605 } else if (strcmp(op, "==") == 0 ||
1606 strcmp(op, "!=") == 0) {
1607 return 10;
1608 } else if (strcmp(op, "&&") == 0) {
1609 return 14;
1610 } else if (strcmp(op, "||") == 0) {
1611 return 15;
1612 } else {
1613 die("unknown op '%s'", op);
1614 return -1;
1615 }
1616 }
1617}
1618
1619static void set_op_prio(struct print_arg *arg)
1620{
1621
1622 /* single ops are the greatest */
1623 if (!arg->op.left || arg->op.left->type == PRINT_NULL) {
1624 arg->op.prio = 0;
1625 return;
1626 }
1627
1628 arg->op.prio = get_op_prio(arg->op.op);
1629}
1630
1631/* Note, *tok does not get freed, but will most likely be saved */
1632static enum event_type
1633process_op(struct event_format *event, struct print_arg *arg, char **tok)
1634{
1635 struct print_arg *left, *right = NULL;
1636 enum event_type type;
1637 char *token;
1638
1639 /* the op is passed in via tok */
1640 token = *tok;
1641
1642 if (arg->type == PRINT_OP && !arg->op.left) {
1643 /* handle single op */
1644 if (token[1]) {
1645 die("bad op token %s", token);
1646 goto out_free;
1647 }
1648 switch (token[0]) {
1649 case '~':
1650 case '!':
1651 case '+':
1652 case '-':
1653 break;
1654 default:
1655 do_warning("bad op token %s", token);
1656 goto out_free;
1657
1658 }
1659
1660 /* make an empty left */
1661 left = alloc_arg();
1662 left->type = PRINT_NULL;
1663 arg->op.left = left;
1664
1665 right = alloc_arg();
1666 arg->op.right = right;
1667
1668 /* do not free the token, it belongs to an op */
1669 *tok = NULL;
1670 type = process_arg(event, right, tok);
1671
1672 } else if (strcmp(token, "?") == 0) {
1673
1674 left = alloc_arg();
1675 /* copy the top arg to the left */
1676 *left = *arg;
1677
1678 arg->type = PRINT_OP;
1679 arg->op.op = token;
1680 arg->op.left = left;
1681 arg->op.prio = 0;
1682
1683 type = process_cond(event, arg, tok);
1684
1685 } else if (strcmp(token, ">>") == 0 ||
1686 strcmp(token, "<<") == 0 ||
1687 strcmp(token, "&") == 0 ||
1688 strcmp(token, "|") == 0 ||
1689 strcmp(token, "&&") == 0 ||
1690 strcmp(token, "||") == 0 ||
1691 strcmp(token, "-") == 0 ||
1692 strcmp(token, "+") == 0 ||
1693 strcmp(token, "*") == 0 ||
1694 strcmp(token, "^") == 0 ||
1695 strcmp(token, "/") == 0 ||
1696 strcmp(token, "<") == 0 ||
1697 strcmp(token, ">") == 0 ||
1698 strcmp(token, "==") == 0 ||
1699 strcmp(token, "!=") == 0) {
1700
1701 left = alloc_arg();
1702
1703 /* copy the top arg to the left */
1704 *left = *arg;
1705
1706 arg->type = PRINT_OP;
1707 arg->op.op = token;
1708 arg->op.left = left;
1709
1710 set_op_prio(arg);
1711
1712 type = read_token_item(&token);
1713 *tok = token;
1714
1715 /* could just be a type pointer */
1716 if ((strcmp(arg->op.op, "*") == 0) &&
1717 type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1718 if (left->type != PRINT_ATOM)
1719 die("bad pointer type");
1720 left->atom.atom = realloc(left->atom.atom,
1721 strlen(left->atom.atom) + 3);
1722 strcat(left->atom.atom, " *");
1723 free(arg->op.op);
1724 *arg = *left;
1725 free(left);
1726
1727 return type;
1728 }
1729
1730 right = alloc_arg();
1731 type = process_arg_token(event, right, tok, type);
1732 arg->op.right = right;
1733
1734 } else if (strcmp(token, "[") == 0) {
1735
1736 left = alloc_arg();
1737 *left = *arg;
1738
1739 arg->type = PRINT_OP;
1740 arg->op.op = token;
1741 arg->op.left = left;
1742
1743 arg->op.prio = 0;
1744
1745 type = process_array(event, arg, tok);
1746
1747 } else {
1748 do_warning("unknown op '%s'", token);
1749 event->flags |= EVENT_FL_FAILED;
1750 /* the arg is now the left side */
1751 goto out_free;
1752 }
1753
1754 if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
1755 int prio;
1756
1757 /* higher prios need to be closer to the root */
1758 prio = get_op_prio(*tok);
1759
1760 if (prio > arg->op.prio)
1761 return process_op(event, arg, tok);
1762
1763 return process_op(event, right, tok);
1764 }
1765
1766 return type;
1767
1768 out_free:
1769 free_token(token);
1770 *tok = NULL;
1771 return EVENT_ERROR;
1772}
1773
1774static enum event_type
1775process_entry(struct event_format *event __unused, struct print_arg *arg,
1776 char **tok)
1777{
1778 enum event_type type;
1779 char *field;
1780 char *token;
1781
1782 if (read_expected(EVENT_OP, "->") < 0)
1783 goto out_err;
1784
1785 if (read_expect_type(EVENT_ITEM, &token) < 0)
1786 goto out_free;
1787 field = token;
1788
1789 arg->type = PRINT_FIELD;
1790 arg->field.name = field;
1791
1792 type = read_token(&token);
1793 *tok = token;
1794
1795 return type;
1796
1797 out_free:
1798 free_token(token);
1799 out_err:
1800 *tok = NULL;
1801 return EVENT_ERROR;
1802}
1803
1804static char *arg_eval (struct print_arg *arg);
1805
1806static unsigned long long
1807eval_type_str(unsigned long long val, const char *type, int pointer)
1808{
1809 int sign = 0;
1810 char *ref;
1811 int len;
1812
1813 len = strlen(type);
1814
1815 if (pointer) {
1816
1817 if (type[len-1] != '*') {
1818 do_warning("pointer expected with non pointer type");
1819 return val;
1820 }
1821
1822 ref = malloc_or_die(len);
1823 memcpy(ref, type, len);
1824
1825 /* chop off the " *" */
1826 ref[len - 2] = 0;
1827
1828 val = eval_type_str(val, ref, 0);
1829 free(ref);
1830 return val;
1831 }
1832
1833 /* check if this is a pointer */
1834 if (type[len - 1] == '*')
1835 return val;
1836
1837 /* Try to figure out the arg size*/
1838 if (strncmp(type, "struct", 6) == 0)
1839 /* all bets off */
1840 return val;
1841
1842 if (strcmp(type, "u8") == 0)
1843 return val & 0xff;
1844
1845 if (strcmp(type, "u16") == 0)
1846 return val & 0xffff;
1847
1848 if (strcmp(type, "u32") == 0)
1849 return val & 0xffffffff;
1850
1851 if (strcmp(type, "u64") == 0 ||
1852 strcmp(type, "s64"))
1853 return val;
1854
1855 if (strcmp(type, "s8") == 0)
1856 return (unsigned long long)(char)val & 0xff;
1857
1858 if (strcmp(type, "s16") == 0)
1859 return (unsigned long long)(short)val & 0xffff;
1860
1861 if (strcmp(type, "s32") == 0)
1862 return (unsigned long long)(int)val & 0xffffffff;
1863
1864 if (strncmp(type, "unsigned ", 9) == 0) {
1865 sign = 0;
1866 type += 9;
1867 }
1868
1869 if (strcmp(type, "char") == 0) {
1870 if (sign)
1871 return (unsigned long long)(char)val & 0xff;
1872 else
1873 return val & 0xff;
1874 }
1875
1876 if (strcmp(type, "short") == 0) {
1877 if (sign)
1878 return (unsigned long long)(short)val & 0xffff;
1879 else
1880 return val & 0xffff;
1881 }
1882
1883 if (strcmp(type, "int") == 0) {
1884 if (sign)
1885 return (unsigned long long)(int)val & 0xffffffff;
1886 else
1887 return val & 0xffffffff;
1888 }
1889
1890 return val;
1891}
1892
1893/*
1894 * Try to figure out the type.
1895 */
1896static unsigned long long
1897eval_type(unsigned long long val, struct print_arg *arg, int pointer)
1898{
1899 if (arg->type != PRINT_TYPE)
1900 die("expected type argument");
1901
1902 return eval_type_str(val, arg->typecast.type, pointer);
1903}
1904
1905static long long arg_num_eval(struct print_arg *arg)
1906{
1907 long long left, right;
1908 long long val = 0;
1909
1910 switch (arg->type) {
1911 case PRINT_ATOM:
1912 val = strtoll(arg->atom.atom, NULL, 0);
1913 break;
1914 case PRINT_TYPE:
1915 val = arg_num_eval(arg->typecast.item);
1916 val = eval_type(val, arg, 0);
1917 break;
1918 case PRINT_OP:
1919 switch (arg->op.op[0]) {
1920 case '|':
1921 left = arg_num_eval(arg->op.left);
1922 right = arg_num_eval(arg->op.right);
1923 if (arg->op.op[1])
1924 val = left || right;
1925 else
1926 val = left | right;
1927 break;
1928 case '&':
1929 left = arg_num_eval(arg->op.left);
1930 right = arg_num_eval(arg->op.right);
1931 if (arg->op.op[1])
1932 val = left && right;
1933 else
1934 val = left & right;
1935 break;
1936 case '<':
1937 left = arg_num_eval(arg->op.left);
1938 right = arg_num_eval(arg->op.right);
1939 switch (arg->op.op[1]) {
1940 case 0:
1941 val = left < right;
1942 break;
1943 case '<':
1944 val = left << right;
1945 break;
1946 case '=':
1947 val = left <= right;
1948 break;
1949 default:
1950 die("unknown op '%s'", arg->op.op);
1951 }
1952 break;
1953 case '>':
1954 left = arg_num_eval(arg->op.left);
1955 right = arg_num_eval(arg->op.right);
1956 switch (arg->op.op[1]) {
1957 case 0:
1958 val = left > right;
1959 break;
1960 case '>':
1961 val = left >> right;
1962 break;
1963 case '=':
1964 val = left >= right;
1965 break;
1966 default:
1967 die("unknown op '%s'", arg->op.op);
1968 }
1969 break;
1970 case '=':
1971 left = arg_num_eval(arg->op.left);
1972 right = arg_num_eval(arg->op.right);
1973
1974 if (arg->op.op[1] != '=')
1975 die("unknown op '%s'", arg->op.op);
1976
1977 val = left == right;
1978 break;
1979 case '!':
1980 left = arg_num_eval(arg->op.left);
1981 right = arg_num_eval(arg->op.right);
1982
1983 switch (arg->op.op[1]) {
1984 case '=':
1985 val = left != right;
1986 break;
1987 default:
1988 die("unknown op '%s'", arg->op.op);
1989 }
1990 break;
1991 case '-':
1992 /* check for negative */
1993 if (arg->op.left->type == PRINT_NULL)
1994 left = 0;
1995 else
1996 left = arg_num_eval(arg->op.left);
1997 right = arg_num_eval(arg->op.right);
1998 val = left - right;
1999 break;
2000 default:
2001 die("unknown op '%s'", arg->op.op);
2002 }
2003 break;
2004
2005 case PRINT_NULL:
2006 case PRINT_FIELD ... PRINT_SYMBOL:
2007 case PRINT_STRING:
2008 case PRINT_BSTRING:
2009 default:
2010 die("invalid eval type %d", arg->type);
2011
2012 }
2013 return val;
2014}
2015
2016static char *arg_eval (struct print_arg *arg)
2017{
2018 long long val;
2019 static char buf[20];
2020
2021 switch (arg->type) {
2022 case PRINT_ATOM:
2023 return arg->atom.atom;
2024 case PRINT_TYPE:
2025 return arg_eval(arg->typecast.item);
2026 case PRINT_OP:
2027 val = arg_num_eval(arg);
2028 sprintf(buf, "%lld", val);
2029 return buf;
2030
2031 case PRINT_NULL:
2032 case PRINT_FIELD ... PRINT_SYMBOL:
2033 case PRINT_STRING:
2034 case PRINT_BSTRING:
2035 default:
2036 die("invalid eval type %d", arg->type);
2037 break;
2038 }
2039
2040 return NULL;
2041}
2042
2043static enum event_type
2044process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2045{
2046 enum event_type type;
2047 struct print_arg *arg = NULL;
2048 struct print_flag_sym *field;
2049 char *token = *tok;
2050 char *value;
2051
2052 do {
2053 free_token(token);
2054 type = read_token_item(&token);
2055 if (test_type_token(type, token, EVENT_OP, "{"))
2056 break;
2057
2058 arg = alloc_arg();
2059
2060 free_token(token);
2061 type = process_arg(event, arg, &token);
2062 if (test_type_token(type, token, EVENT_DELIM, ","))
2063 goto out_free;
2064
2065 field = malloc_or_die(sizeof(*field));
2066 memset(field, 0, sizeof(field));
2067
2068 value = arg_eval(arg);
2069 field->value = strdup(value);
2070
2071 free_arg(arg);
2072 arg = alloc_arg();
2073
2074 free_token(token);
2075 type = process_arg(event, arg, &token);
2076 if (test_type_token(type, token, EVENT_OP, "}"))
2077 goto out_free;
2078
2079 value = arg_eval(arg);
2080 field->str = strdup(value);
2081 free_arg(arg);
2082 arg = NULL;
2083
2084 *list = field;
2085 list = &field->next;
2086
2087 free_token(token);
2088 type = read_token_item(&token);
2089 } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2090
2091 *tok = token;
2092 return type;
2093
2094out_free:
2095 free_arg(arg);
2096 free_token(token);
2097 *tok = NULL;
2098
2099 return EVENT_ERROR;
2100}
2101
2102static enum event_type
2103process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2104{
2105 struct print_arg *field;
2106 enum event_type type;
2107 char *token;
2108
2109 memset(arg, 0, sizeof(*arg));
2110 arg->type = PRINT_FLAGS;
2111
2112 field = alloc_arg();
2113
2114 type = process_arg(event, field, &token);
2115
2116 /* Handle operations in the first argument */
2117 while (type == EVENT_OP)
2118 type = process_op(event, field, &token);
2119
2120 if (test_type_token(type, token, EVENT_DELIM, ","))
2121 goto out_free;
2122 free_token(token);
2123
2124 arg->flags.field = field;
2125
2126 type = read_token_item(&token);
2127 if (event_item_type(type)) {
2128 arg->flags.delim = token;
2129 type = read_token_item(&token);
2130 }
2131
2132 if (test_type_token(type, token, EVENT_DELIM, ","))
2133 goto out_free;
2134
2135 type = process_fields(event, &arg->flags.flags, &token);
2136 if (test_type_token(type, token, EVENT_DELIM, ")"))
2137 goto out_free;
2138
2139 free_token(token);
2140 type = read_token_item(tok);
2141 return type;
2142
2143 out_free:
2144 free_token(token);
2145 *tok = NULL;
2146 return EVENT_ERROR;
2147}
2148
2149static enum event_type
2150process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2151{
2152 struct print_arg *field;
2153 enum event_type type;
2154 char *token;
2155
2156 memset(arg, 0, sizeof(*arg));
2157 arg->type = PRINT_SYMBOL;
2158
2159 field = alloc_arg();
2160
2161 type = process_arg(event, field, &token);
2162 if (test_type_token(type, token, EVENT_DELIM, ","))
2163 goto out_free;
2164
2165 arg->symbol.field = field;
2166
2167 type = process_fields(event, &arg->symbol.symbols, &token);
2168 if (test_type_token(type, token, EVENT_DELIM, ")"))
2169 goto out_free;
2170
2171 free_token(token);
2172 type = read_token_item(tok);
2173 return type;
2174
2175 out_free:
2176 free_token(token);
2177 *tok = NULL;
2178 return EVENT_ERROR;
2179}
2180
2181static enum event_type
2182process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2183{
2184 struct format_field *field;
2185 enum event_type type;
2186 char *token;
2187
2188 memset(arg, 0, sizeof(*arg));
2189 arg->type = PRINT_DYNAMIC_ARRAY;
2190
2191 /*
2192 * The item within the parenthesis is another field that holds
2193 * the index into where the array starts.
2194 */
2195 type = read_token(&token);
2196 *tok = token;
2197 if (type != EVENT_ITEM)
2198 goto out_free;
2199
2200 /* Find the field */
2201
2202 field = pevent_find_field(event, token);
2203 if (!field)
2204 goto out_free;
2205
2206 arg->dynarray.field = field;
2207 arg->dynarray.index = 0;
2208
2209 if (read_expected(EVENT_DELIM, ")") < 0)
2210 goto out_free;
2211
2212 free_token(token);
2213 type = read_token_item(&token);
2214 *tok = token;
2215 if (type != EVENT_OP || strcmp(token, "[") != 0)
2216 return type;
2217
2218 free_token(token);
2219 arg = alloc_arg();
2220 type = process_arg(event, arg, &token);
2221 if (type == EVENT_ERROR)
2222 goto out_free;
2223
2224 if (!test_type_token(type, token, EVENT_OP, "]"))
2225 goto out_free;
2226
2227 free_token(token);
2228 type = read_token_item(tok);
2229 return type;
2230
2231 out_free:
2232 free(arg);
2233 free_token(token);
2234 *tok = NULL;
2235 return EVENT_ERROR;
2236}
2237
2238static enum event_type
2239process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2240{
2241 struct print_arg *item_arg;
2242 enum event_type type;
2243 char *token;
2244
2245 type = process_arg(event, arg, &token);
2246
2247 if (type == EVENT_ERROR)
2248 goto out_free;
2249
2250 if (type == EVENT_OP)
2251 type = process_op(event, arg, &token);
2252
2253 if (type == EVENT_ERROR)
2254 goto out_free;
2255
2256 if (test_type_token(type, token, EVENT_DELIM, ")"))
2257 goto out_free;
2258
2259 free_token(token);
2260 type = read_token_item(&token);
2261
2262 /*
2263 * If the next token is an item or another open paren, then
2264 * this was a typecast.
2265 */
2266 if (event_item_type(type) ||
2267 (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2268
2269 /* make this a typecast and contine */
2270
2271 /* prevous must be an atom */
2272 if (arg->type != PRINT_ATOM)
2273 die("previous needed to be PRINT_ATOM");
2274
2275 item_arg = alloc_arg();
2276
2277 arg->type = PRINT_TYPE;
2278 arg->typecast.type = arg->atom.atom;
2279 arg->typecast.item = item_arg;
2280 type = process_arg_token(event, item_arg, &token, type);
2281
2282 }
2283
2284 *tok = token;
2285 return type;
2286
2287 out_free:
2288 free_token(token);
2289 *tok = NULL;
2290 return EVENT_ERROR;
2291}
2292
2293
2294static enum event_type
2295process_str(struct event_format *event __unused, struct print_arg *arg, char **tok)
2296{
2297 enum event_type type;
2298 char *token;
2299
2300 if (read_expect_type(EVENT_ITEM, &token) < 0)
2301 goto out_free;
2302
2303 arg->type = PRINT_STRING;
2304 arg->string.string = token;
2305 arg->string.offset = -1;
2306
2307 if (read_expected(EVENT_DELIM, ")") < 0)
2308 goto out_err;
2309
2310 type = read_token(&token);
2311 *tok = token;
2312
2313 return type;
2314
2315 out_free:
2316 free_token(token);
2317 out_err:
2318 *tok = NULL;
2319 return EVENT_ERROR;
2320}
2321
2322static struct pevent_function_handler *
2323find_func_handler(struct pevent *pevent, char *func_name)
2324{
2325 struct pevent_function_handler *func;
2326
2327 for (func = pevent->func_handlers; func; func = func->next) {
2328 if (strcmp(func->name, func_name) == 0)
2329 break;
2330 }
2331
2332 return func;
2333}
2334
2335static void remove_func_handler(struct pevent *pevent, char *func_name)
2336{
2337 struct pevent_function_handler *func;
2338 struct pevent_function_handler **next;
2339
2340 next = &pevent->func_handlers;
2341 while ((func = *next)) {
2342 if (strcmp(func->name, func_name) == 0) {
2343 *next = func->next;
2344 free_func_handle(func);
2345 break;
2346 }
2347 next = &func->next;
2348 }
2349}
2350
2351static enum event_type
2352process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2353 struct print_arg *arg, char **tok)
2354{
2355 struct print_arg **next_arg;
2356 struct print_arg *farg;
2357 enum event_type type;
2358 char *token;
2359 char *test;
2360 int i;
2361
2362 arg->type = PRINT_FUNC;
2363 arg->func.func = func;
2364
2365 *tok = NULL;
2366
2367 next_arg = &(arg->func.args);
2368 for (i = 0; i < func->nr_args; i++) {
2369 farg = alloc_arg();
2370 type = process_arg(event, farg, &token);
2371 if (i < (func->nr_args - 1))
2372 test = ",";
2373 else
2374 test = ")";
2375
2376 if (test_type_token(type, token, EVENT_DELIM, test)) {
2377 free_arg(farg);
2378 free_token(token);
2379 return EVENT_ERROR;
2380 }
2381
2382 *next_arg = farg;
2383 next_arg = &(farg->next);
2384 free_token(token);
2385 }
2386
2387 type = read_token(&token);
2388 *tok = token;
2389
2390 return type;
2391}
2392
2393static enum event_type
2394process_function(struct event_format *event, struct print_arg *arg,
2395 char *token, char **tok)
2396{
2397 struct pevent_function_handler *func;
2398
2399 if (strcmp(token, "__print_flags") == 0) {
2400 free_token(token);
2401 return process_flags(event, arg, tok);
2402 }
2403 if (strcmp(token, "__print_symbolic") == 0) {
2404 free_token(token);
2405 return process_symbols(event, arg, tok);
2406 }
2407 if (strcmp(token, "__get_str") == 0) {
2408 free_token(token);
2409 return process_str(event, arg, tok);
2410 }
2411 if (strcmp(token, "__get_dynamic_array") == 0) {
2412 free_token(token);
2413 return process_dynamic_array(event, arg, tok);
2414 }
2415
2416 func = find_func_handler(event->pevent, token);
2417 if (func) {
2418 free_token(token);
2419 return process_func_handler(event, func, arg, tok);
2420 }
2421
2422 do_warning("function %s not defined", token);
2423 free_token(token);
2424 return EVENT_ERROR;
2425}
2426
2427static enum event_type
2428process_arg_token(struct event_format *event, struct print_arg *arg,
2429 char **tok, enum event_type type)
2430{
2431 char *token;
2432 char *atom;
2433
2434 token = *tok;
2435
2436 switch (type) {
2437 case EVENT_ITEM:
2438 if (strcmp(token, "REC") == 0) {
2439 free_token(token);
2440 type = process_entry(event, arg, &token);
2441 break;
2442 }
2443 atom = token;
2444 /* test the next token */
2445 type = read_token_item(&token);
2446
2447 /*
2448 * If the next token is a parenthesis, then this
2449 * is a function.
2450 */
2451 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
2452 free_token(token);
2453 token = NULL;
2454 /* this will free atom. */
2455 type = process_function(event, arg, atom, &token);
2456 break;
2457 }
2458 /* atoms can be more than one token long */
2459 while (type == EVENT_ITEM) {
2460 atom = realloc(atom, strlen(atom) + strlen(token) + 2);
2461 strcat(atom, " ");
2462 strcat(atom, token);
2463 free_token(token);
2464 type = read_token_item(&token);
2465 }
2466
2467 arg->type = PRINT_ATOM;
2468 arg->atom.atom = atom;
2469 break;
2470
2471 case EVENT_DQUOTE:
2472 case EVENT_SQUOTE:
2473 arg->type = PRINT_ATOM;
2474 arg->atom.atom = token;
2475 type = read_token_item(&token);
2476 break;
2477 case EVENT_DELIM:
2478 if (strcmp(token, "(") == 0) {
2479 free_token(token);
2480 type = process_paren(event, arg, &token);
2481 break;
2482 }
2483 case EVENT_OP:
2484 /* handle single ops */
2485 arg->type = PRINT_OP;
2486 arg->op.op = token;
2487 arg->op.left = NULL;
2488 type = process_op(event, arg, &token);
2489
2490 /* On error, the op is freed */
2491 if (type == EVENT_ERROR)
2492 arg->op.op = NULL;
2493
2494 /* return error type if errored */
2495 break;
2496
2497 case EVENT_ERROR ... EVENT_NEWLINE:
2498 default:
2499 die("unexpected type %d", type);
2500 }
2501 *tok = token;
2502
2503 return type;
2504}
2505
2506static int event_read_print_args(struct event_format *event, struct print_arg **list)
2507{
2508 enum event_type type = EVENT_ERROR;
2509 struct print_arg *arg;
2510 char *token;
2511 int args = 0;
2512
2513 do {
2514 if (type == EVENT_NEWLINE) {
2515 type = read_token_item(&token);
2516 continue;
2517 }
2518
2519 arg = alloc_arg();
2520
2521 type = process_arg(event, arg, &token);
2522
2523 if (type == EVENT_ERROR) {
2524 free_token(token);
2525 free_arg(arg);
2526 return -1;
2527 }
2528
2529 *list = arg;
2530 args++;
2531
2532 if (type == EVENT_OP) {
2533 type = process_op(event, arg, &token);
2534 free_token(token);
2535 if (type == EVENT_ERROR) {
2536 *list = NULL;
2537 free_arg(arg);
2538 return -1;
2539 }
2540 list = &arg->next;
2541 continue;
2542 }
2543
2544 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
2545 free_token(token);
2546 *list = arg;
2547 list = &arg->next;
2548 continue;
2549 }
2550 break;
2551 } while (type != EVENT_NONE);
2552
2553 if (type != EVENT_NONE && type != EVENT_ERROR)
2554 free_token(token);
2555
2556 return args;
2557}
2558
2559static int event_read_print(struct event_format *event)
2560{
2561 enum event_type type;
2562 char *token;
2563 int ret;
2564
2565 if (read_expected_item(EVENT_ITEM, "print") < 0)
2566 return -1;
2567
2568 if (read_expected(EVENT_ITEM, "fmt") < 0)
2569 return -1;
2570
2571 if (read_expected(EVENT_OP, ":") < 0)
2572 return -1;
2573
2574 if (read_expect_type(EVENT_DQUOTE, &token) < 0)
2575 goto fail;
2576
2577 concat:
2578 event->print_fmt.format = token;
2579 event->print_fmt.args = NULL;
2580
2581 /* ok to have no arg */
2582 type = read_token_item(&token);
2583
2584 if (type == EVENT_NONE)
2585 return 0;
2586
2587 /* Handle concatenation of print lines */
2588 if (type == EVENT_DQUOTE) {
2589 char *cat;
2590
2591 cat = malloc_or_die(strlen(event->print_fmt.format) +
2592 strlen(token) + 1);
2593 strcpy(cat, event->print_fmt.format);
2594 strcat(cat, token);
2595 free_token(token);
2596 free_token(event->print_fmt.format);
2597 event->print_fmt.format = NULL;
2598 token = cat;
2599 goto concat;
2600 }
2601
2602 if (test_type_token(type, token, EVENT_DELIM, ","))
2603 goto fail;
2604
2605 free_token(token);
2606
2607 ret = event_read_print_args(event, &event->print_fmt.args);
2608 if (ret < 0)
2609 return -1;
2610
2611 return ret;
2612
2613 fail:
2614 free_token(token);
2615 return -1;
2616}
2617
2618/**
2619 * pevent_find_common_field - return a common field by event
2620 * @event: handle for the event
2621 * @name: the name of the common field to return
2622 *
2623 * Returns a common field from the event by the given @name.
2624 * This only searchs the common fields and not all field.
2625 */
2626struct format_field *
2627pevent_find_common_field(struct event_format *event, const char *name)
2628{
2629 struct format_field *format;
2630
2631 for (format = event->format.common_fields;
2632 format; format = format->next) {
2633 if (strcmp(format->name, name) == 0)
2634 break;
2635 }
2636
2637 return format;
2638}
2639
2640/**
2641 * pevent_find_field - find a non-common field
2642 * @event: handle for the event
2643 * @name: the name of the non-common field
2644 *
2645 * Returns a non-common field by the given @name.
2646 * This does not search common fields.
2647 */
2648struct format_field *
2649pevent_find_field(struct event_format *event, const char *name)
2650{
2651 struct format_field *format;
2652
2653 for (format = event->format.fields;
2654 format; format = format->next) {
2655 if (strcmp(format->name, name) == 0)
2656 break;
2657 }
2658
2659 return format;
2660}
2661
2662/**
2663 * pevent_find_any_field - find any field by name
2664 * @event: handle for the event
2665 * @name: the name of the field
2666 *
2667 * Returns a field by the given @name.
2668 * This searchs the common field names first, then
2669 * the non-common ones if a common one was not found.
2670 */
2671struct format_field *
2672pevent_find_any_field(struct event_format *event, const char *name)
2673{
2674 struct format_field *format;
2675
2676 format = pevent_find_common_field(event, name);
2677 if (format)
2678 return format;
2679 return pevent_find_field(event, name);
2680}
2681
2682/**
2683 * pevent_read_number - read a number from data
2684 * @pevent: handle for the pevent
2685 * @ptr: the raw data
2686 * @size: the size of the data that holds the number
2687 *
2688 * Returns the number (converted to host) from the
2689 * raw data.
2690 */
2691unsigned long long pevent_read_number(struct pevent *pevent,
2692 const void *ptr, int size)
2693{
2694 switch (size) {
2695 case 1:
2696 return *(unsigned char *)ptr;
2697 case 2:
2698 return data2host2(pevent, ptr);
2699 case 4:
2700 return data2host4(pevent, ptr);
2701 case 8:
2702 return data2host8(pevent, ptr);
2703 default:
2704 /* BUG! */
2705 return 0;
2706 }
2707}
2708
2709/**
2710 * pevent_read_number_field - read a number from data
2711 * @field: a handle to the field
2712 * @data: the raw data to read
2713 * @value: the value to place the number in
2714 *
2715 * Reads raw data according to a field offset and size,
2716 * and translates it into @value.
2717 *
2718 * Returns 0 on success, -1 otherwise.
2719 */
2720int pevent_read_number_field(struct format_field *field, const void *data,
2721 unsigned long long *value)
2722{
2723 if (!field)
2724 return -1;
2725 switch (field->size) {
2726 case 1:
2727 case 2:
2728 case 4:
2729 case 8:
2730 *value = pevent_read_number(field->event->pevent,
2731 data + field->offset, field->size);
2732 return 0;
2733 default:
2734 return -1;
2735 }
2736}
2737
2738static int get_common_info(struct pevent *pevent,
2739 const char *type, int *offset, int *size)
2740{
2741 struct event_format *event;
2742 struct format_field *field;
2743
2744 /*
2745 * All events should have the same common elements.
2746 * Pick any event to find where the type is;
2747 */
2748 if (!pevent->events)
2749 die("no event_list!");
2750
2751 event = pevent->events[0];
2752 field = pevent_find_common_field(event, type);
2753 if (!field)
2754 die("field '%s' not found", type);
2755
2756 *offset = field->offset;
2757 *size = field->size;
2758
2759 return 0;
2760}
2761
2762static int __parse_common(struct pevent *pevent, void *data,
2763 int *size, int *offset, const char *name)
2764{
2765 int ret;
2766
2767 if (!*size) {
2768 ret = get_common_info(pevent, name, offset, size);
2769 if (ret < 0)
2770 return ret;
2771 }
2772 return pevent_read_number(pevent, data + *offset, *size);
2773}
2774
2775static int trace_parse_common_type(struct pevent *pevent, void *data)
2776{
2777 return __parse_common(pevent, data,
2778 &pevent->type_size, &pevent->type_offset,
2779 "common_type");
2780}
2781
2782static int parse_common_pid(struct pevent *pevent, void *data)
2783{
2784 return __parse_common(pevent, data,
2785 &pevent->pid_size, &pevent->pid_offset,
2786 "common_pid");
2787}
2788
2789static int parse_common_pc(struct pevent *pevent, void *data)
2790{
2791 return __parse_common(pevent, data,
2792 &pevent->pc_size, &pevent->pc_offset,
2793 "common_preempt_count");
2794}
2795
2796static int parse_common_flags(struct pevent *pevent, void *data)
2797{
2798 return __parse_common(pevent, data,
2799 &pevent->flags_size, &pevent->flags_offset,
2800 "common_flags");
2801}
2802
2803static int parse_common_lock_depth(struct pevent *pevent, void *data)
2804{
2805 int ret;
2806
2807 ret = __parse_common(pevent, data,
2808 &pevent->ld_size, &pevent->ld_offset,
2809 "common_lock_depth");
2810 if (ret < 0)
2811 return -1;
2812
2813 return ret;
2814}
2815
2816static int events_id_cmp(const void *a, const void *b);
2817
2818/**
2819 * pevent_find_event - find an event by given id
2820 * @pevent: a handle to the pevent
2821 * @id: the id of the event
2822 *
2823 * Returns an event that has a given @id.
2824 */
2825struct event_format *pevent_find_event(struct pevent *pevent, int id)
2826{
2827 struct event_format **eventptr;
2828 struct event_format key;
2829 struct event_format *pkey = &key;
2830
2831 /* Check cache first */
2832 if (pevent->last_event && pevent->last_event->id == id)
2833 return pevent->last_event;
2834
2835 key.id = id;
2836
2837 eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
2838 sizeof(*pevent->events), events_id_cmp);
2839
2840 if (eventptr) {
2841 pevent->last_event = *eventptr;
2842 return *eventptr;
2843 }
2844
2845 return NULL;
2846}
2847
2848/**
2849 * pevent_find_event_by_name - find an event by given name
2850 * @pevent: a handle to the pevent
2851 * @sys: the system name to search for
2852 * @name: the name of the event to search for
2853 *
2854 * This returns an event with a given @name and under the system
2855 * @sys. If @sys is NULL the first event with @name is returned.
2856 */
2857struct event_format *
2858pevent_find_event_by_name(struct pevent *pevent,
2859 const char *sys, const char *name)
2860{
2861 struct event_format *event;
2862 int i;
2863
2864 if (pevent->last_event &&
2865 strcmp(pevent->last_event->name, name) == 0 &&
2866 (!sys || strcmp(pevent->last_event->system, sys) == 0))
2867 return pevent->last_event;
2868
2869 for (i = 0; i < pevent->nr_events; i++) {
2870 event = pevent->events[i];
2871 if (strcmp(event->name, name) == 0) {
2872 if (!sys)
2873 break;
2874 if (strcmp(event->system, sys) == 0)
2875 break;
2876 }
2877 }
2878 if (i == pevent->nr_events)
2879 event = NULL;
2880
2881 pevent->last_event = event;
2882 return event;
2883}
2884
2885static unsigned long long
2886eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
2887{
2888 struct pevent *pevent = event->pevent;
2889 unsigned long long val = 0;
2890 unsigned long long left, right;
2891 struct print_arg *typearg = NULL;
2892 struct print_arg *larg;
2893 unsigned long offset;
2894 unsigned int field_size;
2895
2896 switch (arg->type) {
2897 case PRINT_NULL:
2898 /* ?? */
2899 return 0;
2900 case PRINT_ATOM:
2901 return strtoull(arg->atom.atom, NULL, 0);
2902 case PRINT_FIELD:
2903 if (!arg->field.field) {
2904 arg->field.field = pevent_find_any_field(event, arg->field.name);
2905 if (!arg->field.field)
2906 die("field %s not found", arg->field.name);
2907 }
2908 /* must be a number */
2909 val = pevent_read_number(pevent, data + arg->field.field->offset,
2910 arg->field.field->size);
2911 break;
2912 case PRINT_FLAGS:
2913 case PRINT_SYMBOL:
2914 break;
2915 case PRINT_TYPE:
2916 val = eval_num_arg(data, size, event, arg->typecast.item);
2917 return eval_type(val, arg, 0);
2918 case PRINT_STRING:
2919 case PRINT_BSTRING:
2920 return 0;
2921 case PRINT_FUNC: {
2922 struct trace_seq s;
2923 trace_seq_init(&s);
2924 val = process_defined_func(&s, data, size, event, arg);
2925 trace_seq_destroy(&s);
2926 return val;
2927 }
2928 case PRINT_OP:
2929 if (strcmp(arg->op.op, "[") == 0) {
2930 /*
2931 * Arrays are special, since we don't want
2932 * to read the arg as is.
2933 */
2934 right = eval_num_arg(data, size, event, arg->op.right);
2935
2936 /* handle typecasts */
2937 larg = arg->op.left;
2938 while (larg->type == PRINT_TYPE) {
2939 if (!typearg)
2940 typearg = larg;
2941 larg = larg->typecast.item;
2942 }
2943
2944 /* Default to long size */
2945 field_size = pevent->long_size;
2946
2947 switch (larg->type) {
2948 case PRINT_DYNAMIC_ARRAY:
2949 offset = pevent_read_number(pevent,
2950 data + larg->dynarray.field->offset,
2951 larg->dynarray.field->size);
2952 if (larg->dynarray.field->elementsize)
2953 field_size = larg->dynarray.field->elementsize;
2954 /*
2955 * The actual length of the dynamic array is stored
2956 * in the top half of the field, and the offset
2957 * is in the bottom half of the 32 bit field.
2958 */
2959 offset &= 0xffff;
2960 offset += right;
2961 break;
2962 case PRINT_FIELD:
2963 if (!larg->field.field) {
2964 larg->field.field =
2965 pevent_find_any_field(event, larg->field.name);
2966 if (!larg->field.field)
2967 die("field %s not found", larg->field.name);
2968 }
2969 field_size = larg->field.field->elementsize;
2970 offset = larg->field.field->offset +
2971 right * larg->field.field->elementsize;
2972 break;
2973 default:
2974 goto default_op; /* oops, all bets off */
2975 }
2976 val = pevent_read_number(pevent,
2977 data + offset, field_size);
2978 if (typearg)
2979 val = eval_type(val, typearg, 1);
2980 break;
2981 } else if (strcmp(arg->op.op, "?") == 0) {
2982 left = eval_num_arg(data, size, event, arg->op.left);
2983 arg = arg->op.right;
2984 if (left)
2985 val = eval_num_arg(data, size, event, arg->op.left);
2986 else
2987 val = eval_num_arg(data, size, event, arg->op.right);
2988 break;
2989 }
2990 default_op:
2991 left = eval_num_arg(data, size, event, arg->op.left);
2992 right = eval_num_arg(data, size, event, arg->op.right);
2993 switch (arg->op.op[0]) {
2994 case '!':
2995 switch (arg->op.op[1]) {
2996 case 0:
2997 val = !right;
2998 break;
2999 case '=':
3000 val = left != right;
3001 break;
3002 default:
3003 die("unknown op '%s'", arg->op.op);
3004 }
3005 break;
3006 case '~':
3007 val = ~right;
3008 break;
3009 case '|':
3010 if (arg->op.op[1])
3011 val = left || right;
3012 else
3013 val = left | right;
3014 break;
3015 case '&':
3016 if (arg->op.op[1])
3017 val = left && right;
3018 else
3019 val = left & right;
3020 break;
3021 case '<':
3022 switch (arg->op.op[1]) {
3023 case 0:
3024 val = left < right;
3025 break;
3026 case '<':
3027 val = left << right;
3028 break;
3029 case '=':
3030 val = left <= right;
3031 break;
3032 default:
3033 die("unknown op '%s'", arg->op.op);
3034 }
3035 break;
3036 case '>':
3037 switch (arg->op.op[1]) {
3038 case 0:
3039 val = left > right;
3040 break;
3041 case '>':
3042 val = left >> right;
3043 break;
3044 case '=':
3045 val = left >= right;
3046 break;
3047 default:
3048 die("unknown op '%s'", arg->op.op);
3049 }
3050 break;
3051 case '=':
3052 if (arg->op.op[1] != '=')
3053 die("unknown op '%s'", arg->op.op);
3054 val = left == right;
3055 break;
3056 case '-':
3057 val = left - right;
3058 break;
3059 case '+':
3060 val = left + right;
3061 break;
3062 default:
3063 die("unknown op '%s'", arg->op.op);
3064 }
3065 break;
3066 default: /* not sure what to do there */
3067 return 0;
3068 }
3069 return val;
3070}
3071
3072struct flag {
3073 const char *name;
3074 unsigned long long value;
3075};
3076
3077static const struct flag flags[] = {
3078 { "HI_SOFTIRQ", 0 },
3079 { "TIMER_SOFTIRQ", 1 },
3080 { "NET_TX_SOFTIRQ", 2 },
3081 { "NET_RX_SOFTIRQ", 3 },
3082 { "BLOCK_SOFTIRQ", 4 },
3083 { "BLOCK_IOPOLL_SOFTIRQ", 5 },
3084 { "TASKLET_SOFTIRQ", 6 },
3085 { "SCHED_SOFTIRQ", 7 },
3086 { "HRTIMER_SOFTIRQ", 8 },
3087 { "RCU_SOFTIRQ", 9 },
3088
3089 { "HRTIMER_NORESTART", 0 },
3090 { "HRTIMER_RESTART", 1 },
3091};
3092
3093static unsigned long long eval_flag(const char *flag)
3094{
3095 int i;
3096
3097 /*
3098 * Some flags in the format files do not get converted.
3099 * If the flag is not numeric, see if it is something that
3100 * we already know about.
3101 */
3102 if (isdigit(flag[0]))
3103 return strtoull(flag, NULL, 0);
3104
3105 for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3106 if (strcmp(flags[i].name, flag) == 0)
3107 return flags[i].value;
3108
3109 return 0;
3110}
3111
3112static void print_str_to_seq(struct trace_seq *s, const char *format,
3113 int len_arg, const char *str)
3114{
3115 if (len_arg >= 0)
3116 trace_seq_printf(s, format, len_arg, str);
3117 else
3118 trace_seq_printf(s, format, str);
3119}
3120
3121static void print_str_arg(struct trace_seq *s, void *data, int size,
3122 struct event_format *event, const char *format,
3123 int len_arg, struct print_arg *arg)
3124{
3125 struct pevent *pevent = event->pevent;
3126 struct print_flag_sym *flag;
3127 unsigned long long val, fval;
3128 unsigned long addr;
3129 char *str;
3130 int print;
3131 int len;
3132
3133 switch (arg->type) {
3134 case PRINT_NULL:
3135 /* ?? */
3136 return;
3137 case PRINT_ATOM:
3138 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3139 return;
3140 case PRINT_FIELD:
3141 if (!arg->field.field) {
3142 arg->field.field = pevent_find_any_field(event, arg->field.name);
3143 if (!arg->field.field)
3144 die("field %s not found", arg->field.name);
3145 }
3146 /* Zero sized fields, mean the rest of the data */
3147 len = arg->field.field->size ? : size - arg->field.field->offset;
3148
3149 /*
3150 * Some events pass in pointers. If this is not an array
3151 * and the size is the same as long_size, assume that it
3152 * is a pointer.
3153 */
3154 if (!(arg->field.field->flags & FIELD_IS_ARRAY) &&
3155 arg->field.field->size == pevent->long_size) {
3156 addr = *(unsigned long *)(data + arg->field.field->offset);
3157 trace_seq_printf(s, "%lx", addr);
3158 break;
3159 }
3160 str = malloc_or_die(len + 1);
3161 memcpy(str, data + arg->field.field->offset, len);
3162 str[len] = 0;
3163 print_str_to_seq(s, format, len_arg, str);
3164 free(str);
3165 break;
3166 case PRINT_FLAGS:
3167 val = eval_num_arg(data, size, event, arg->flags.field);
3168 print = 0;
3169 for (flag = arg->flags.flags; flag; flag = flag->next) {
3170 fval = eval_flag(flag->value);
3171 if (!val && !fval) {
3172 print_str_to_seq(s, format, len_arg, flag->str);
3173 break;
3174 }
3175 if (fval && (val & fval) == fval) {
3176 if (print && arg->flags.delim)
3177 trace_seq_puts(s, arg->flags.delim);
3178 print_str_to_seq(s, format, len_arg, flag->str);
3179 print = 1;
3180 val &= ~fval;
3181 }
3182 }
3183 break;
3184 case PRINT_SYMBOL:
3185 val = eval_num_arg(data, size, event, arg->symbol.field);
3186 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3187 fval = eval_flag(flag->value);
3188 if (val == fval) {
3189 print_str_to_seq(s, format, len_arg, flag->str);
3190 break;
3191 }
3192 }
3193 break;
3194
3195 case PRINT_TYPE:
3196 break;
3197 case PRINT_STRING: {
3198 int str_offset;
3199
3200 if (arg->string.offset == -1) {
3201 struct format_field *f;
3202
3203 f = pevent_find_any_field(event, arg->string.string);
3204 arg->string.offset = f->offset;
3205 }
3206 str_offset = data2host4(pevent, data + arg->string.offset);
3207 str_offset &= 0xffff;
3208 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
3209 break;
3210 }
3211 case PRINT_BSTRING:
3212 trace_seq_printf(s, format, arg->string.string);
3213 break;
3214 case PRINT_OP:
3215 /*
3216 * The only op for string should be ? :
3217 */
3218 if (arg->op.op[0] != '?')
3219 return;
3220 val = eval_num_arg(data, size, event, arg->op.left);
3221 if (val)
3222 print_str_arg(s, data, size, event,
3223 format, len_arg, arg->op.right->op.left);
3224 else
3225 print_str_arg(s, data, size, event,
3226 format, len_arg, arg->op.right->op.right);
3227 break;
3228 case PRINT_FUNC:
3229 process_defined_func(s, data, size, event, arg);
3230 break;
3231 default:
3232 /* well... */
3233 break;
3234 }
3235}
3236
3237static unsigned long long
3238process_defined_func(struct trace_seq *s, void *data, int size,
3239 struct event_format *event, struct print_arg *arg)
3240{
3241 struct pevent_function_handler *func_handle = arg->func.func;
3242 struct pevent_func_params *param;
3243 unsigned long long *args;
3244 unsigned long long ret;
3245 struct print_arg *farg;
3246 struct trace_seq str;
3247 struct save_str {
3248 struct save_str *next;
3249 char *str;
3250 } *strings = NULL, *string;
3251 int i;
3252
3253 if (!func_handle->nr_args) {
3254 ret = (*func_handle->func)(s, NULL);
3255 goto out;
3256 }
3257
3258 farg = arg->func.args;
3259 param = func_handle->params;
3260
3261 args = malloc_or_die(sizeof(*args) * func_handle->nr_args);
3262 for (i = 0; i < func_handle->nr_args; i++) {
3263 switch (param->type) {
3264 case PEVENT_FUNC_ARG_INT:
3265 case PEVENT_FUNC_ARG_LONG:
3266 case PEVENT_FUNC_ARG_PTR:
3267 args[i] = eval_num_arg(data, size, event, farg);
3268 break;
3269 case PEVENT_FUNC_ARG_STRING:
3270 trace_seq_init(&str);
3271 print_str_arg(&str, data, size, event, "%s", -1, farg);
3272 trace_seq_terminate(&str);
3273 string = malloc_or_die(sizeof(*string));
3274 string->next = strings;
3275 string->str = strdup(str.buffer);
3276 strings = string;
3277 trace_seq_destroy(&str);
3278 break;
3279 default:
3280 /*
3281 * Something went totally wrong, this is not
3282 * an input error, something in this code broke.
3283 */
3284 die("Unexpected end of arguments\n");
3285 break;
3286 }
3287 farg = farg->next;
3288 }
3289
3290 ret = (*func_handle->func)(s, args);
3291 free(args);
3292 while (strings) {
3293 string = strings;
3294 strings = string->next;
3295 free(string->str);
3296 free(string);
3297 }
3298
3299 out:
3300 /* TBD : handle return type here */
3301 return ret;
3302}
3303
3304static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
3305{
3306 struct pevent *pevent = event->pevent;
3307 struct format_field *field, *ip_field;
3308 struct print_arg *args, *arg, **next;
3309 unsigned long long ip, val;
3310 char *ptr;
3311 void *bptr;
3312
3313 field = pevent->bprint_buf_field;
3314 ip_field = pevent->bprint_ip_field;
3315
3316 if (!field) {
3317 field = pevent_find_field(event, "buf");
3318 if (!field)
3319 die("can't find buffer field for binary printk");
3320 ip_field = pevent_find_field(event, "ip");
3321 if (!ip_field)
3322 die("can't find ip field for binary printk");
3323 pevent->bprint_buf_field = field;
3324 pevent->bprint_ip_field = ip_field;
3325 }
3326
3327 ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
3328
3329 /*
3330 * The first arg is the IP pointer.
3331 */
3332 args = alloc_arg();
3333 arg = args;
3334 arg->next = NULL;
3335 next = &arg->next;
3336
3337 arg->type = PRINT_ATOM;
3338 arg->atom.atom = malloc_or_die(32);
3339 sprintf(arg->atom.atom, "%lld", ip);
3340
3341 /* skip the first "%pf : " */
3342 for (ptr = fmt + 6, bptr = data + field->offset;
3343 bptr < data + size && *ptr; ptr++) {
3344 int ls = 0;
3345
3346 if (*ptr == '%') {
3347 process_again:
3348 ptr++;
3349 switch (*ptr) {
3350 case '%':
3351 break;
3352 case 'l':
3353 ls++;
3354 goto process_again;
3355 case 'L':
3356 ls = 2;
3357 goto process_again;
3358 case '0' ... '9':
3359 goto process_again;
3360 case 'p':
3361 ls = 1;
3362 /* fall through */
3363 case 'd':
3364 case 'u':
3365 case 'x':
3366 case 'i':
3367 /* the pointers are always 4 bytes aligned */
3368 bptr = (void *)(((unsigned long)bptr + 3) &
3369 ~3);
3370 switch (ls) {
3371 case 0:
3372 ls = 4;
3373 break;
3374 case 1:
3375 ls = pevent->long_size;
3376 break;
3377 case 2:
3378 ls = 8;
3379 default:
3380 break;
3381 }
3382 val = pevent_read_number(pevent, bptr, ls);
3383 bptr += ls;
3384 arg = alloc_arg();
3385 arg->next = NULL;
3386 arg->type = PRINT_ATOM;
3387 arg->atom.atom = malloc_or_die(32);
3388 sprintf(arg->atom.atom, "%lld", val);
3389 *next = arg;
3390 next = &arg->next;
3391 break;
3392 case 's':
3393 arg = alloc_arg();
3394 arg->next = NULL;
3395 arg->type = PRINT_BSTRING;
3396 arg->string.string = strdup(bptr);
3397 bptr += strlen(bptr) + 1;
3398 *next = arg;
3399 next = &arg->next;
3400 default:
3401 break;
3402 }
3403 }
3404 }
3405
3406 return args;
3407}
3408
3409static void free_args(struct print_arg *args)
3410{
3411 struct print_arg *next;
3412
3413 while (args) {
3414 next = args->next;
3415
3416 free_arg(args);
3417 args = next;
3418 }
3419}
3420
3421static char *
3422get_bprint_format(void *data, int size __unused, struct event_format *event)
3423{
3424 struct pevent *pevent = event->pevent;
3425 unsigned long long addr;
3426 struct format_field *field;
3427 struct printk_map *printk;
3428 char *format;
3429 char *p;
3430
3431 field = pevent->bprint_fmt_field;
3432
3433 if (!field) {
3434 field = pevent_find_field(event, "fmt");
3435 if (!field)
3436 die("can't find format field for binary printk");
3437 pevent->bprint_fmt_field = field;
3438 }
3439
3440 addr = pevent_read_number(pevent, data + field->offset, field->size);
3441
3442 printk = find_printk(pevent, addr);
3443 if (!printk) {
3444 format = malloc_or_die(45);
3445 sprintf(format, "%%pf : (NO FORMAT FOUND at %llx)\n",
3446 addr);
3447 return format;
3448 }
3449
3450 p = printk->printk;
3451 /* Remove any quotes. */
3452 if (*p == '"')
3453 p++;
3454 format = malloc_or_die(strlen(p) + 10);
3455 sprintf(format, "%s : %s", "%pf", p);
3456 /* remove ending quotes and new line since we will add one too */
3457 p = format + strlen(format) - 1;
3458 if (*p == '"')
3459 *p = 0;
3460
3461 p -= 2;
3462 if (strcmp(p, "\\n") == 0)
3463 *p = 0;
3464
3465 return format;
3466}
3467
3468static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
3469 struct event_format *event, struct print_arg *arg)
3470{
3471 unsigned char *buf;
3472 char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
3473
3474 if (arg->type == PRINT_FUNC) {
3475 process_defined_func(s, data, size, event, arg);
3476 return;
3477 }
3478
3479 if (arg->type != PRINT_FIELD) {
3480 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
3481 arg->type);
3482 return;
3483 }
3484
3485 if (mac == 'm')
3486 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
3487 if (!arg->field.field) {
3488 arg->field.field =
3489 pevent_find_any_field(event, arg->field.name);
3490 if (!arg->field.field)
3491 die("field %s not found", arg->field.name);
3492 }
3493 if (arg->field.field->size != 6) {
3494 trace_seq_printf(s, "INVALIDMAC");
3495 return;
3496 }
3497 buf = data + arg->field.field->offset;
3498 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
3499}
3500
3501static void print_event_fields(struct trace_seq *s, void *data, int size,
3502 struct event_format *event)
3503{
3504 struct format_field *field;
3505 unsigned long long val;
3506 unsigned int offset, len, i;
3507
3508 field = event->format.fields;
3509 while (field) {
3510 trace_seq_printf(s, " %s=", field->name);
3511 if (field->flags & FIELD_IS_ARRAY) {
3512 offset = field->offset;
3513 len = field->size;
3514 if (field->flags & FIELD_IS_DYNAMIC) {
3515 val = pevent_read_number(event->pevent, data + offset, len);
3516 offset = val;
3517 len = offset >> 16;
3518 offset &= 0xffff;
3519 }
3520 if (field->flags & FIELD_IS_STRING) {
3521 trace_seq_printf(s, "%s", (char *)data + offset);
3522 } else {
3523 trace_seq_puts(s, "ARRAY[");
3524 for (i = 0; i < len; i++) {
3525 if (i)
3526 trace_seq_puts(s, ", ");
3527 trace_seq_printf(s, "%02x",
3528 *((unsigned char *)data + offset + i));
3529 }
3530 trace_seq_putc(s, ']');
3531 }
3532 } else {
3533 val = pevent_read_number(event->pevent, data + field->offset,
3534 field->size);
3535 if (field->flags & FIELD_IS_POINTER) {
3536 trace_seq_printf(s, "0x%llx", val);
3537 } else if (field->flags & FIELD_IS_SIGNED) {
3538 switch (field->size) {
3539 case 4:
3540 /*
3541 * If field is long then print it in hex.
3542 * A long usually stores pointers.
3543 */
3544 if (field->flags & FIELD_IS_LONG)
3545 trace_seq_printf(s, "0x%x", (int)val);
3546 else
3547 trace_seq_printf(s, "%d", (int)val);
3548 break;
3549 case 2:
3550 trace_seq_printf(s, "%2d", (short)val);
3551 break;
3552 case 1:
3553 trace_seq_printf(s, "%1d", (char)val);
3554 break;
3555 default:
3556 trace_seq_printf(s, "%lld", val);
3557 }
3558 } else {
3559 if (field->flags & FIELD_IS_LONG)
3560 trace_seq_printf(s, "0x%llx", val);
3561 else
3562 trace_seq_printf(s, "%llu", val);
3563 }
3564 }
3565 field = field->next;
3566 }
3567}
3568
3569static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
3570{
3571 struct pevent *pevent = event->pevent;
3572 struct print_fmt *print_fmt = &event->print_fmt;
3573 struct print_arg *arg = print_fmt->args;
3574 struct print_arg *args = NULL;
3575 const char *ptr = print_fmt->format;
3576 unsigned long long val;
3577 struct func_map *func;
3578 const char *saveptr;
3579 char *bprint_fmt = NULL;
3580 char format[32];
3581 int show_func;
3582 int len_as_arg;
3583 int len_arg;
3584 int len;
3585 int ls;
3586
3587 if (event->flags & EVENT_FL_FAILED) {
3588 trace_seq_printf(s, "[FAILED TO PARSE]");
3589 print_event_fields(s, data, size, event);
3590 return;
3591 }
3592
3593 if (event->flags & EVENT_FL_ISBPRINT) {
3594 bprint_fmt = get_bprint_format(data, size, event);
3595 args = make_bprint_args(bprint_fmt, data, size, event);
3596 arg = args;
3597 ptr = bprint_fmt;
3598 }
3599
3600 for (; *ptr; ptr++) {
3601 ls = 0;
3602 if (*ptr == '\\') {
3603 ptr++;
3604 switch (*ptr) {
3605 case 'n':
3606 trace_seq_putc(s, '\n');
3607 break;
3608 case 't':
3609 trace_seq_putc(s, '\t');
3610 break;
3611 case 'r':
3612 trace_seq_putc(s, '\r');
3613 break;
3614 case '\\':
3615 trace_seq_putc(s, '\\');
3616 break;
3617 default:
3618 trace_seq_putc(s, *ptr);
3619 break;
3620 }
3621
3622 } else if (*ptr == '%') {
3623 saveptr = ptr;
3624 show_func = 0;
3625 len_as_arg = 0;
3626 cont_process:
3627 ptr++;
3628 switch (*ptr) {
3629 case '%':
3630 trace_seq_putc(s, '%');
3631 break;
3632 case '#':
3633 /* FIXME: need to handle properly */
3634 goto cont_process;
3635 case 'h':
3636 ls--;
3637 goto cont_process;
3638 case 'l':
3639 ls++;
3640 goto cont_process;
3641 case 'L':
3642 ls = 2;
3643 goto cont_process;
3644 case '*':
3645 /* The argument is the length. */
3646 if (!arg)
3647 die("no argument match");
3648 len_arg = eval_num_arg(data, size, event, arg);
3649 len_as_arg = 1;
3650 arg = arg->next;
3651 goto cont_process;
3652 case '.':
3653 case 'z':
3654 case 'Z':
3655 case '0' ... '9':
3656 goto cont_process;
3657 case 'p':
3658 if (pevent->long_size == 4)
3659 ls = 1;
3660 else
3661 ls = 2;
3662
3663 if (*(ptr+1) == 'F' ||
3664 *(ptr+1) == 'f') {
3665 ptr++;
3666 show_func = *ptr;
3667 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
3668 print_mac_arg(s, *(ptr+1), data, size, event, arg);
3669 ptr++;
3670 break;
3671 }
3672
3673 /* fall through */
3674 case 'd':
3675 case 'i':
3676 case 'x':
3677 case 'X':
3678 case 'u':
3679 if (!arg)
3680 die("no argument match");
3681
3682 len = ((unsigned long)ptr + 1) -
3683 (unsigned long)saveptr;
3684
3685 /* should never happen */
3686 if (len > 31)
3687 die("bad format!");
3688
3689 memcpy(format, saveptr, len);
3690 format[len] = 0;
3691
3692 val = eval_num_arg(data, size, event, arg);
3693 arg = arg->next;
3694
3695 if (show_func) {
3696 func = find_func(pevent, val);
3697 if (func) {
3698 trace_seq_puts(s, func->func);
3699 if (show_func == 'F')
3700 trace_seq_printf(s,
3701 "+0x%llx",
3702 val - func->addr);
3703 break;
3704 }
3705 }
3706 if (pevent->long_size == 8 && ls) {
3707 char *p;
3708
3709 ls = 2;
3710 /* make %l into %ll */
3711 p = strchr(format, 'l');
3712 if (p)
3713 memmove(p, p+1, strlen(p)+1);
3714 else if (strcmp(format, "%p") == 0)
3715 strcpy(format, "0x%llx");
3716 }
3717 switch (ls) {
3718 case -2:
3719 if (len_as_arg)
3720 trace_seq_printf(s, format, len_arg, (char)val);
3721 else
3722 trace_seq_printf(s, format, (char)val);
3723 break;
3724 case -1:
3725 if (len_as_arg)
3726 trace_seq_printf(s, format, len_arg, (short)val);
3727 else
3728 trace_seq_printf(s, format, (short)val);
3729 break;
3730 case 0:
3731 if (len_as_arg)
3732 trace_seq_printf(s, format, len_arg, (int)val);
3733 else
3734 trace_seq_printf(s, format, (int)val);
3735 break;
3736 case 1:
3737 if (len_as_arg)
3738 trace_seq_printf(s, format, len_arg, (long)val);
3739 else
3740 trace_seq_printf(s, format, (long)val);
3741 break;
3742 case 2:
3743 if (len_as_arg)
3744 trace_seq_printf(s, format, len_arg,
3745 (long long)val);
3746 else
3747 trace_seq_printf(s, format, (long long)val);
3748 break;
3749 default:
3750 die("bad count (%d)", ls);
3751 }
3752 break;
3753 case 's':
3754 if (!arg)
3755 die("no matching argument");
3756
3757 len = ((unsigned long)ptr + 1) -
3758 (unsigned long)saveptr;
3759
3760 /* should never happen */
3761 if (len > 31)
3762 die("bad format!");
3763
3764 memcpy(format, saveptr, len);
3765 format[len] = 0;
3766 if (!len_as_arg)
3767 len_arg = -1;
3768 print_str_arg(s, data, size, event,
3769 format, len_arg, arg);
3770 arg = arg->next;
3771 break;
3772 default:
3773 trace_seq_printf(s, ">%c<", *ptr);
3774
3775 }
3776 } else
3777 trace_seq_putc(s, *ptr);
3778 }
3779
3780 if (args) {
3781 free_args(args);
3782 free(bprint_fmt);
3783 }
3784}
3785
3786/**
3787 * pevent_data_lat_fmt - parse the data for the latency format
3788 * @pevent: a handle to the pevent
3789 * @s: the trace_seq to write to
3790 * @data: the raw data to read from
3791 * @size: currently unused.
3792 *
3793 * This parses out the Latency format (interrupts disabled,
3794 * need rescheduling, in hard/soft interrupt, preempt count
3795 * and lock depth) and places it into the trace_seq.
3796 */
3797void pevent_data_lat_fmt(struct pevent *pevent,
3798 struct trace_seq *s, struct record *record)
3799{
3800 static int check_lock_depth = 1;
3801 static int lock_depth_exists;
3802 unsigned int lat_flags;
3803 unsigned int pc;
3804 int lock_depth;
3805 int hardirq;
3806 int softirq;
3807 void *data = record->data;
3808
3809 lat_flags = parse_common_flags(pevent, data);
3810 pc = parse_common_pc(pevent, data);
3811 /* lock_depth may not always exist */
3812 if (check_lock_depth) {
3813 struct format_field *field;
3814 struct event_format *event;
3815
3816 check_lock_depth = 0;
3817 event = pevent->events[0];
3818 field = pevent_find_common_field(event, "common_lock_depth");
3819 if (field)
3820 lock_depth_exists = 1;
3821 }
3822 if (lock_depth_exists)
3823 lock_depth = parse_common_lock_depth(pevent, data);
3824
3825 hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
3826 softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
3827
3828 trace_seq_printf(s, "%c%c%c",
3829 (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
3830 (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
3831 'X' : '.',
3832 (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
3833 'N' : '.',
3834 (hardirq && softirq) ? 'H' :
3835 hardirq ? 'h' : softirq ? 's' : '.');
3836
3837 if (pc)
3838 trace_seq_printf(s, "%x", pc);
3839 else
3840 trace_seq_putc(s, '.');
3841
3842 if (lock_depth_exists) {
3843 if (lock_depth < 0)
3844 trace_seq_putc(s, '.');
3845 else
3846 trace_seq_printf(s, "%d", lock_depth);
3847 }
3848
3849 trace_seq_terminate(s);
3850}
3851
3852/**
3853 * pevent_data_type - parse out the given event type
3854 * @pevent: a handle to the pevent
3855 * @rec: the record to read from
3856 *
3857 * This returns the event id from the @rec.
3858 */
3859int pevent_data_type(struct pevent *pevent, struct record *rec)
3860{
3861 return trace_parse_common_type(pevent, rec->data);
3862}
3863
3864/**
3865 * pevent_data_event_from_type - find the event by a given type
3866 * @pevent: a handle to the pevent
3867 * @type: the type of the event.
3868 *
3869 * This returns the event form a given @type;
3870 */
3871struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
3872{
3873 return pevent_find_event(pevent, type);
3874}
3875
3876/**
3877 * pevent_data_pid - parse the PID from raw data
3878 * @pevent: a handle to the pevent
3879 * @rec: the record to parse
3880 *
3881 * This returns the PID from a raw data.
3882 */
3883int pevent_data_pid(struct pevent *pevent, struct record *rec)
3884{
3885 return parse_common_pid(pevent, rec->data);
3886}
3887
3888/**
3889 * pevent_data_comm_from_pid - return the command line from PID
3890 * @pevent: a handle to the pevent
3891 * @pid: the PID of the task to search for
3892 *
3893 * This returns a pointer to the command line that has the given
3894 * @pid.
3895 */
3896const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
3897{
3898 const char *comm;
3899
3900 comm = find_cmdline(pevent, pid);
3901 return comm;
3902}
3903
3904/**
3905 * pevent_data_comm_from_pid - parse the data into the print format
3906 * @s: the trace_seq to write to
3907 * @event: the handle to the event
3908 * @cpu: the cpu the event was recorded on
3909 * @data: the raw data
3910 * @size: the size of the raw data
3911 * @nsecs: the timestamp of the event
3912 *
3913 * This parses the raw @data using the given @event information and
3914 * writes the print format into the trace_seq.
3915 */
3916void pevent_event_info(struct trace_seq *s, struct event_format *event,
3917 struct record *record)
3918{
3919 int print_pretty = 1;
3920
3921 if (event->pevent->print_raw)
3922 print_event_fields(s, record->data, record->size, event);
3923 else {
3924
3925 if (event->handler)
3926 print_pretty = event->handler(s, record, event,
3927 event->context);
3928
3929 if (print_pretty)
3930 pretty_print(s, record->data, record->size, event);
3931 }
3932
3933 trace_seq_terminate(s);
3934}
3935
3936void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
3937 struct record *record)
3938{
3939 static char *spaces = " "; /* 20 spaces */
3940 struct event_format *event;
3941 unsigned long secs;
3942 unsigned long usecs;
4dc1024a 3943 unsigned long nsecs;
f7d82350
SR		 3944 const char *comm;
3945 void *data = record->data;
3946 int type;
3947 int pid;
3948 int len;
4dc1024a 3949 int p;
f7d82350
SR		 3950
3951 secs = record->ts / NSECS_PER_SEC;
4dc1024a 3952 nsecs = record->ts - secs * NSECS_PER_SEC;
f7d82350
SR		 3953
3954 if (record->size < 0) {
3955 do_warning("ug! negative record size %d", record->size);
3956 return;
3957 }
3958
3959 type = trace_parse_common_type(pevent, data);
3960
3961 event = pevent_find_event(pevent, type);
3962 if (!event) {
3963 do_warning("ug! no event found for type %d", type);
3964 return;
3965 }
3966
3967 pid = parse_common_pid(pevent, data);
3968 comm = find_cmdline(pevent, pid);
3969
3970 if (pevent->latency_format) {
3971 trace_seq_printf(s, "%8.8s-%-5d %3d",
3972 comm, pid, record->cpu);
3973 pevent_data_lat_fmt(pevent, s, record);
3974 } else
3975 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
3976
4dc1024a
SR		 3977 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
3978 usecs = nsecs;
3979 p = 9;
3980 } else {
3981 usecs = (nsecs + 500) / NSECS_PER_USEC;
3982 p = 6;
3983 }
3984
3985 trace_seq_printf(s, " %5lu.%0*lu: %s: ", secs, p, usecs, event->name);
f7d82350
SR		 3986
3987 /* Space out the event names evenly. */
3988 len = strlen(event->name);
3989 if (len < 20)
3990 trace_seq_printf(s, "%.*s", 20 - len, spaces);
3991
3992 pevent_event_info(s, event, record);
3993}
3994
3995static int events_id_cmp(const void *a, const void *b)
3996{
3997 struct event_format * const * ea = a;
3998 struct event_format * const * eb = b;
3999
4000 if ((*ea)->id < (*eb)->id)
4001 return -1;
4002
4003 if ((*ea)->id > (*eb)->id)
4004 return 1;
4005
4006 return 0;
4007}
4008
4009static int events_name_cmp(const void *a, const void *b)
4010{
4011 struct event_format * const * ea = a;
4012 struct event_format * const * eb = b;
4013 int res;
4014
4015 res = strcmp((*ea)->name, (*eb)->name);
4016 if (res)
4017 return res;
4018
4019 res = strcmp((*ea)->system, (*eb)->system);
4020 if (res)
4021 return res;
4022
4023 return events_id_cmp(a, b);
4024}
4025
4026static int events_system_cmp(const void *a, const void *b)
4027{
4028 struct event_format * const * ea = a;
4029 struct event_format * const * eb = b;
4030 int res;
4031
4032 res = strcmp((*ea)->system, (*eb)->system);
4033 if (res)
4034 return res;
4035
4036 res = strcmp((*ea)->name, (*eb)->name);
4037 if (res)
4038 return res;
4039
4040 return events_id_cmp(a, b);
4041}
4042
4043struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
4044{
4045 struct event_format **events;
4046 int (*sort)(const void *a, const void *b);
4047
4048 events = pevent->sort_events;
4049
4050 if (events && pevent->last_type == sort_type)
4051 return events;
4052
4053 if (!events) {
4054 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
4055 if (!events)
4056 return NULL;
4057
4058 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
4059 events[pevent->nr_events] = NULL;
4060
4061 pevent->sort_events = events;
4062
4063 /* the internal events are sorted by id */
4064 if (sort_type == EVENT_SORT_ID) {
4065 pevent->last_type = sort_type;
4066 return events;
4067 }
4068 }
4069
4070 switch (sort_type) {
4071 case EVENT_SORT_ID:
4072 sort = events_id_cmp;
4073 break;
4074 case EVENT_SORT_NAME:
4075 sort = events_name_cmp;
4076 break;
4077 case EVENT_SORT_SYSTEM:
4078 sort = events_system_cmp;
4079 break;
4080 default:
4081 return events;
4082 }
4083
4084 qsort(events, pevent->nr_events, sizeof(*events), sort);
4085 pevent->last_type = sort_type;
4086
4087 return events;
4088}
4089
4090static struct format_field **
4091get_event_fields(const char *type, const char *name,
4092 int count, struct format_field *list)
4093{
4094 struct format_field **fields;
4095 struct format_field *field;
4096 int i = 0;
4097
4098 fields = malloc_or_die(sizeof(*fields) * (count + 1));
4099 for (field = list; field; field = field->next) {
4100 fields[i++] = field;
4101 if (i == count + 1) {
4102 do_warning("event %s has more %s fields than specified",
4103 name, type);
4104 i--;
4105 break;
4106 }
4107 }
4108
4109 if (i != count)
4110 do_warning("event %s has less %s fields than specified",
4111 name, type);
4112
4113 fields[i] = NULL;
4114
4115 return fields;
4116}
4117
4118/**
4119 * pevent_event_common_fields - return a list of common fields for an event
4120 * @event: the event to return the common fields of.
4121 *
4122 * Returns an allocated array of fields. The last item in the array is NULL.
4123 * The array must be freed with free().
4124 */
4125struct format_field **pevent_event_common_fields(struct event_format *event)
4126{
4127 return get_event_fields("common", event->name,
4128 event->format.nr_common,
4129 event->format.common_fields);
4130}
4131
4132/**
4133 * pevent_event_fields - return a list of event specific fields for an event
4134 * @event: the event to return the fields of.
4135 *
4136 * Returns an allocated array of fields. The last item in the array is NULL.
4137 * The array must be freed with free().
4138 */
4139struct format_field **pevent_event_fields(struct event_format *event)
4140{
4141 return get_event_fields("event", event->name,
4142 event->format.nr_fields,
4143 event->format.fields);
4144}
4145
4146static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
4147{
4148 trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
4149 if (field->next) {
4150 trace_seq_puts(s, ", ");
4151 print_fields(s, field->next);
4152 }
4153}
4154
4155/* for debugging */
4156static void print_args(struct print_arg *args)
4157{
4158 int print_paren = 1;
4159 struct trace_seq s;
4160
4161 switch (args->type) {
4162 case PRINT_NULL:
4163 printf("null");
4164 break;
4165 case PRINT_ATOM:
4166 printf("%s", args->atom.atom);
4167 break;
4168 case PRINT_FIELD:
4169 printf("REC->%s", args->field.name);
4170 break;
4171 case PRINT_FLAGS:
4172 printf("__print_flags(");
4173 print_args(args->flags.field);
4174 printf(", %s, ", args->flags.delim);
4175 trace_seq_init(&s);
4176 print_fields(&s, args->flags.flags);
4177 trace_seq_do_printf(&s);
4178 trace_seq_destroy(&s);
4179 printf(")");
4180 break;
4181 case PRINT_SYMBOL:
4182 printf("__print_symbolic(");
4183 print_args(args->symbol.field);
4184 printf(", ");
4185 trace_seq_init(&s);
4186 print_fields(&s, args->symbol.symbols);
4187 trace_seq_do_printf(&s);
4188 trace_seq_destroy(&s);
4189 printf(")");
4190 break;
4191 case PRINT_STRING:
4192 case PRINT_BSTRING:
4193 printf("__get_str(%s)", args->string.string);
4194 break;
4195 case PRINT_TYPE:
4196 printf("(%s)", args->typecast.type);
4197 print_args(args->typecast.item);
4198 break;
4199 case PRINT_OP:
4200 if (strcmp(args->op.op, ":") == 0)
4201 print_paren = 0;
4202 if (print_paren)
4203 printf("(");
4204 print_args(args->op.left);
4205 printf(" %s ", args->op.op);
4206 print_args(args->op.right);
4207 if (print_paren)
4208 printf(")");
4209 break;
4210 default:
4211 /* we should warn... */
4212 return;
4213 }
4214 if (args->next) {
4215 printf("\n");
4216 print_args(args->next);
4217 }
4218}
4219
4220static void parse_header_field(const char *field,
4221 int *offset, int *size, int mandatory)
4222{
4223 unsigned long long save_input_buf_ptr;
4224 unsigned long long save_input_buf_siz;
4225 char *token;
4226 int type;
4227
4228 save_input_buf_ptr = input_buf_ptr;
4229 save_input_buf_siz = input_buf_siz;
4230
4231 if (read_expected(EVENT_ITEM, "field") < 0)
4232 return;
4233 if (read_expected(EVENT_OP, ":") < 0)
4234 return;
4235
4236 /* type */
4237 if (read_expect_type(EVENT_ITEM, &token) < 0)
4238 goto fail;
4239 free_token(token);
4240
4241 /*
4242 * If this is not a mandatory field, then test it first.
4243 */
4244 if (mandatory) {
4245 if (read_expected(EVENT_ITEM, field) < 0)
4246 return;
4247 } else {
4248 if (read_expect_type(EVENT_ITEM, &token) < 0)
4249 goto fail;
4250 if (strcmp(token, field) != 0)
4251 goto discard;
4252 free_token(token);
4253 }
4254
4255 if (read_expected(EVENT_OP, ";") < 0)
4256 return;
4257 if (read_expected(EVENT_ITEM, "offset") < 0)
4258 return;
4259 if (read_expected(EVENT_OP, ":") < 0)
4260 return;
4261 if (read_expect_type(EVENT_ITEM, &token) < 0)
4262 goto fail;
4263 *offset = atoi(token);
4264 free_token(token);
4265 if (read_expected(EVENT_OP, ";") < 0)
4266 return;
4267 if (read_expected(EVENT_ITEM, "size") < 0)
4268 return;
4269 if (read_expected(EVENT_OP, ":") < 0)
4270 return;
4271 if (read_expect_type(EVENT_ITEM, &token) < 0)
4272 goto fail;
4273 *size = atoi(token);
4274 free_token(token);
4275 if (read_expected(EVENT_OP, ";") < 0)
4276 return;
4277 type = read_token(&token);
4278 if (type != EVENT_NEWLINE) {
4279 /* newer versions of the kernel have a "signed" type */
4280 if (type != EVENT_ITEM)
4281 goto fail;
4282
4283 if (strcmp(token, "signed") != 0)
4284 goto fail;
4285
4286 free_token(token);
4287
4288 if (read_expected(EVENT_OP, ":") < 0)
4289 return;
4290
4291 if (read_expect_type(EVENT_ITEM, &token))
4292 goto fail;
4293
4294 free_token(token);
4295 if (read_expected(EVENT_OP, ";") < 0)
4296 return;
4297
4298 if (read_expect_type(EVENT_NEWLINE, &token))
4299 goto fail;
4300 }
4301 fail:
4302 free_token(token);
4303 return;
4304
4305 discard:
4306 input_buf_ptr = save_input_buf_ptr;
4307 input_buf_siz = save_input_buf_siz;
4308 *offset = 0;
4309 *size = 0;
4310 free_token(token);
4311}
4312
4313/**
4314 * pevent_parse_header_page - parse the data stored in the header page
4315 * @pevent: the handle to the pevent
4316 * @buf: the buffer storing the header page format string
4317 * @size: the size of @buf
4318 * @long_size: the long size to use if there is no header
4319 *
4320 * This parses the header page format for information on the
4321 * ring buffer used. The @buf should be copied from
4322 *
4323 * /sys/kernel/debug/tracing/events/header_page
4324 */
4325int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
4326 int long_size)
4327{
4328 int ignore;
4329
4330 if (!size) {
4331 /*
4332 * Old kernels did not have header page info.
4333 * Sorry but we just use what we find here in user space.
4334 */
4335 pevent->header_page_ts_size = sizeof(long long);
4336 pevent->header_page_size_size = long_size;
4337 pevent->header_page_data_offset = sizeof(long long) + long_size;
4338 pevent->old_format = 1;
4339 return -1;
4340 }
4341 init_input_buf(buf, size);
4342
4343 parse_header_field("timestamp", &pevent->header_page_ts_offset,
4344 &pevent->header_page_ts_size, 1);
4345 parse_header_field("commit", &pevent->header_page_size_offset,
4346 &pevent->header_page_size_size, 1);
4347 parse_header_field("overwrite", &pevent->header_page_overwrite,
4348 &ignore, 0);
4349 parse_header_field("data", &pevent->header_page_data_offset,
4350 &pevent->header_page_data_size, 1);
4351
4352 return 0;
4353}
4354
4355static int event_matches(struct event_format *event,
4356 int id, const char *sys_name,
4357 const char *event_name)
4358{
4359 if (id >= 0 && id != event->id)
4360 return 0;
4361
4362 if (event_name && (strcmp(event_name, event->name) != 0))
4363 return 0;
4364
4365 if (sys_name && (strcmp(sys_name, event->system) != 0))
4366 return 0;
4367
4368 return 1;
4369}
4370
4371static void free_handler(struct event_handler *handle)
4372{
4373 free((void *)handle->sys_name);
4374 free((void *)handle->event_name);
4375 free(handle);
4376}
4377
4378static int find_event_handle(struct pevent *pevent, struct event_format *event)
4379{
4380 struct event_handler *handle, **next;
4381
4382 for (next = &pevent->handlers; *next;
4383 next = &(*next)->next) {
4384 handle = *next;
4385 if (event_matches(event, handle->id,
4386 handle->sys_name,
4387 handle->event_name))
4388 break;
4389 }
4390
4391 if (!(*next))
4392 return 0;
4393
4394 pr_stat("overriding event (%d) %s:%s with new print handler",
4395 event->id, event->system, event->name);
4396
4397 event->handler = handle->func;
4398 event->context = handle->context;
4399
4400 *next = handle->next;
4401 free_handler(handle);
4402
4403 return 1;
4404}
4405
4406/**
4407 * pevent_parse_event - parse the event format
4408 * @pevent: the handle to the pevent
4409 * @buf: the buffer storing the event format string
4410 * @size: the size of @buf
4411 * @sys: the system the event belongs to
4412 *
4413 * This parses the event format and creates an event structure
4414 * to quickly parse raw data for a given event.
4415 *
4416 * These files currently come from:
4417 *
4418 * /sys/kernel/debug/tracing/events/.../.../format
4419 */
4420int pevent_parse_event(struct pevent *pevent,
4421 const char *buf, unsigned long size,
4422 const char *sys)
4423{
4424 struct event_format *event;
4425 int ret;
4426
4427 init_input_buf(buf, size);
4428
4429 event = alloc_event();
4430 if (!event)
4431 return -ENOMEM;
4432
4433 event->name = event_read_name();
4434 if (!event->name) {
4435 /* Bad event? */
4436 free(event);
4437 return -1;
4438 }
4439
4440 if (strcmp(sys, "ftrace") == 0) {
4441
4442 event->flags |= EVENT_FL_ISFTRACE;
4443
4444 if (strcmp(event->name, "bprint") == 0)
4445 event->flags |= EVENT_FL_ISBPRINT;
4446 }
4447
4448 event->id = event_read_id();
4449 if (event->id < 0)
4450 die("failed to read event id");
4451
4452 event->system = strdup(sys);
4453
4454 /* Add pevent to event so that it can be referenced */
4455 event->pevent = pevent;
4456
4457 ret = event_read_format(event);
4458 if (ret < 0) {
4459 do_warning("failed to read event format for %s", event->name);
4460 goto event_failed;
4461 }
4462
4463 /*
4464 * If the event has an override, don't print warnings if the event
4465 * print format fails to parse.
4466 */
4467 if (find_event_handle(pevent, event))
4468 show_warning = 0;
4469
4470 ret = event_read_print(event);
4471 if (ret < 0) {
4472 do_warning("failed to read event print fmt for %s",
4473 event->name);
4474 show_warning = 1;
4475 goto event_failed;
4476 }
4477 show_warning = 1;
4478
4479 add_event(pevent, event);
4480
4481 if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
4482 struct format_field *field;
4483 struct print_arg *arg, **list;
4484
4485 /* old ftrace had no args */
4486
4487 list = &event->print_fmt.args;
4488 for (field = event->format.fields; field; field = field->next) {
4489 arg = alloc_arg();
4490 *list = arg;
4491 list = &arg->next;
4492 arg->type = PRINT_FIELD;
4493 arg->field.name = strdup(field->name);
4494 arg->field.field = field;
4495 }
4496 return 0;
4497 }
4498
4499#define PRINT_ARGS 0
4500 if (PRINT_ARGS && event->print_fmt.args)
4501 print_args(event->print_fmt.args);
4502
4503 return 0;
4504
4505 event_failed:
4506 event->flags |= EVENT_FL_FAILED;
4507 /* still add it even if it failed */
4508 add_event(pevent, event);
4509 return -1;
4510}
4511
4512int get_field_val(struct trace_seq *s, struct format_field *field,
4513 const char *name, struct record *record,
4514 unsigned long long *val, int err)
4515{
4516 if (!field) {
4517 if (err)
4518 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4519 return -1;
4520 }
4521
4522 if (pevent_read_number_field(field, record->data, val)) {
4523 if (err)
4524 trace_seq_printf(s, " %s=INVALID", name);
4525 return -1;
4526 }
4527
4528 return 0;
4529}
4530
4531/**
4532 * pevent_get_field_raw - return the raw pointer into the data field
4533 * @s: The seq to print to on error
4534 * @event: the event that the field is for
4535 * @name: The name of the field
4536 * @record: The record with the field name.
4537 * @len: place to store the field length.
4538 * @err: print default error if failed.
4539 *
4540 * Returns a pointer into record->data of the field and places
4541 * the length of the field in @len.
4542 *
4543 * On failure, it returns NULL.
4544 */
4545void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
4546 const char *name, struct record *record,
4547 int *len, int err)
4548{
4549 struct format_field *field;
4550 void *data = record->data;
4551 unsigned offset;
4552 int dummy;
4553
4554 if (!event)
4555 return NULL;
4556
4557 field = pevent_find_field(event, name);
4558
4559 if (!field) {
4560 if (err)
4561 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
4562 return NULL;
4563 }
4564
4565 /* Allow @len to be NULL */
4566 if (!len)
4567 len = &dummy;
4568
4569 offset = field->offset;
4570 if (field->flags & FIELD_IS_DYNAMIC) {
4571 offset = pevent_read_number(event->pevent,
4572 data + offset, field->size);
4573 *len = offset >> 16;
4574 offset &= 0xffff;
4575 } else
4576 *len = field->size;
4577
4578 return data + offset;
4579}
4580
4581/**
4582 * pevent_get_field_val - find a field and return its value
4583 * @s: The seq to print to on error
4584 * @event: the event that the field is for
4585 * @name: The name of the field
4586 * @record: The record with the field name.
4587 * @val: place to store the value of the field.
4588 * @err: print default error if failed.
4589 *
4590 * Returns 0 on success -1 on field not found.
4591 */
4592int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
4593 const char *name, struct record *record,
4594 unsigned long long *val, int err)
4595{
4596 struct format_field *field;
4597
4598 if (!event)
4599 return -1;
4600
4601 field = pevent_find_field(event, name);
4602
4603 return get_field_val(s, field, name, record, val, err);
4604}
4605
4606/**
4607 * pevent_get_common_field_val - find a common field and return its value
4608 * @s: The seq to print to on error
4609 * @event: the event that the field is for
4610 * @name: The name of the field
4611 * @record: The record with the field name.
4612 * @val: place to store the value of the field.
4613 * @err: print default error if failed.
4614 *
4615 * Returns 0 on success -1 on field not found.
4616 */
4617int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
4618 const char *name, struct record *record,
4619 unsigned long long *val, int err)
4620{
4621 struct format_field *field;
4622
4623 if (!event)
4624 return -1;
4625
4626 field = pevent_find_common_field(event, name);
4627
4628 return get_field_val(s, field, name, record, val, err);
4629}
4630
4631/**
4632 * pevent_get_any_field_val - find a any field and return its value
4633 * @s: The seq to print to on error
4634 * @event: the event that the field is for
4635 * @name: The name of the field
4636 * @record: The record with the field name.
4637 * @val: place to store the value of the field.
4638 * @err: print default error if failed.
4639 *
4640 * Returns 0 on success -1 on field not found.
4641 */
4642int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
4643 const char *name, struct record *record,
4644 unsigned long long *val, int err)
4645{
4646 struct format_field *field;
4647
4648 if (!event)
4649 return -1;
4650
4651 field = pevent_find_any_field(event, name);
4652
4653 return get_field_val(s, field, name, record, val, err);
4654}
4655
4656/**
4657 * pevent_print_num_field - print a field and a format
4658 * @s: The seq to print to
4659 * @fmt: The printf format to print the field with.
4660 * @event: the event that the field is for
4661 * @name: The name of the field
4662 * @record: The record with the field name.
4663 * @err: print default error if failed.
4664 *
4665 * Returns: 0 on success, -1 field not fould, or 1 if buffer is full.
4666 */
4667int pevent_print_num_field(struct trace_seq *s, const char *fmt,
4668 struct event_format *event, const char *name,
4669 struct record *record, int err)
4670{
4671 struct format_field *field = pevent_find_field(event, name);
4672 unsigned long long val;
4673
4674 if (!field)
4675 goto failed;
4676
4677 if (pevent_read_number_field(field, record->data, &val))
4678 goto failed;
4679
4680 return trace_seq_printf(s, fmt, val);
4681
4682 failed:
4683 if (err)
4684 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
4685 return -1;
4686}
4687
4688static void free_func_handle(struct pevent_function_handler *func)
4689{
4690 struct pevent_func_params *params;
4691
4692 free(func->name);
4693
4694 while (func->params) {
4695 params = func->params;
4696 func->params = params->next;
4697 free(params);
4698 }
4699
4700 free(func);
4701}
4702
4703/**
4704 * pevent_register_print_function - register a helper function
4705 * @pevent: the handle to the pevent
4706 * @func: the function to process the helper function
4707 * @name: the name of the helper function
4708 * @parameters: A list of enum pevent_func_arg_type
4709 *
4710 * Some events may have helper functions in the print format arguments.
4711 * This allows a plugin to dynmically create a way to process one
4712 * of these functions.
4713 *
4714 * The @parameters is a variable list of pevent_func_arg_type enums that
4715 * must end with PEVENT_FUNC_ARG_VOID.
4716 */
4717int pevent_register_print_function(struct pevent *pevent,
4718 pevent_func_handler func,
4719 enum pevent_func_arg_type ret_type,
4720 char *name, ...)
4721{
4722 struct pevent_function_handler *func_handle;
4723 struct pevent_func_params **next_param;
4724 struct pevent_func_params *param;
4725 enum pevent_func_arg_type type;
4726 va_list ap;
4727
4728 func_handle = find_func_handler(pevent, name);
4729 if (func_handle) {
4730 /*
4731 * This is most like caused by the users own
4732 * plugins updating the function. This overrides the
4733 * system defaults.
4734 */
4735 pr_stat("override of function helper '%s'", name);
4736 remove_func_handler(pevent, name);
4737 }
4738
4739 func_handle = malloc_or_die(sizeof(*func_handle));
4740 memset(func_handle, 0, sizeof(*func_handle));
4741
4742 func_handle->ret_type = ret_type;
4743 func_handle->name = strdup(name);
4744 func_handle->func = func;
4745 if (!func_handle->name)
4746 die("Failed to allocate function name");
4747
4748 next_param = &(func_handle->params);
4749 va_start(ap, name);
4750 for (;;) {
4751 type = va_arg(ap, enum pevent_func_arg_type);
4752 if (type == PEVENT_FUNC_ARG_VOID)
4753 break;
4754
4755 if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
4756 warning("Invalid argument type %d", type);
4757 goto out_free;
4758 }
4759
4760 param = malloc_or_die(sizeof(*param));
4761 param->type = type;
4762 param->next = NULL;
4763
4764 *next_param = param;
4765 next_param = &(param->next);
4766
4767 func_handle->nr_args++;
4768 }
4769 va_end(ap);
4770
4771 func_handle->next = pevent->func_handlers;
4772 pevent->func_handlers = func_handle;
4773
4774 return 0;
4775 out_free:
4776 va_end(ap);
4777 free_func_handle(func_handle);
4778 return -1;
4779}
4780
4781/**
4782 * pevent_register_event_handle - register a way to parse an event
4783 * @pevent: the handle to the pevent
4784 * @id: the id of the event to register
4785 * @sys_name: the system name the event belongs to
4786 * @event_name: the name of the event
4787 * @func: the function to call to parse the event information
4788 *
4789 * This function allows a developer to override the parsing of
4790 * a given event. If for some reason the default print format
4791 * is not sufficient, this function will register a function
4792 * for an event to be used to parse the data instead.
4793 *
4794 * If @id is >= 0, then it is used to find the event.
4795 * else @sys_name and @event_name are used.
4796 */
4797int pevent_register_event_handler(struct pevent *pevent,
4798 int id, char *sys_name, char *event_name,
4799 pevent_event_handler_func func,
4800 void *context)
4801{
4802 struct event_format *event;
4803 struct event_handler *handle;
4804
4805 if (id >= 0) {
4806 /* search by id */
4807 event = pevent_find_event(pevent, id);
4808 if (!event)
4809 goto not_found;
4810 if (event_name && (strcmp(event_name, event->name) != 0))
4811 goto not_found;
4812 if (sys_name && (strcmp(sys_name, event->system) != 0))
4813 goto not_found;
4814 } else {
4815 event = pevent_find_event_by_name(pevent, sys_name, event_name);
4816 if (!event)
4817 goto not_found;
4818 }
4819
4820 pr_stat("overriding event (%d) %s:%s with new print handler",
4821 event->id, event->system, event->name);
4822
4823 event->handler = func;
4824 event->context = context;
4825 return 0;
4826
4827 not_found:
4828 /* Save for later use. */
4829 handle = malloc_or_die(sizeof(*handle));
4830 memset(handle, 0, sizeof(handle));
4831 handle->id = id;
4832 if (event_name)
4833 handle->event_name = strdup(event_name);
4834 if (sys_name)
4835 handle->sys_name = strdup(sys_name);
4836
4837 handle->func = func;
4838 handle->next = pevent->handlers;
4839 pevent->handlers = handle;
4840 handle->context = context;
4841
4842 return -1;
4843}
4844
4845/**
4846 * pevent_alloc - create a pevent handle
4847 */
4848struct pevent *pevent_alloc(void)
4849{
4850 struct pevent *pevent;
4851
4852 pevent = malloc(sizeof(*pevent));
4853 if (!pevent)
4854 return NULL;
4855 memset(pevent, 0, sizeof(*pevent));
4856 pevent->ref_count = 1;
4857
4858 return pevent;
4859}
4860
4861void pevent_ref(struct pevent *pevent)
4862{
4863 pevent->ref_count++;
4864}
4865
4866static void free_format_fields(struct format_field *field)
4867{
4868 struct format_field *next;
4869
4870 while (field) {
4871 next = field->next;
4872 free(field->type);
4873 free(field->name);
4874 free(field);
4875 field = next;
4876 }
4877}
4878
4879static void free_formats(struct format *format)
4880{
4881 free_format_fields(format->common_fields);
4882 free_format_fields(format->fields);
4883}
4884
4885static void free_event(struct event_format *event)
4886{
4887 free(event->name);
4888 free(event->system);
4889
4890 free_formats(&event->format);
4891
4892 free(event->print_fmt.format);
4893 free_args(event->print_fmt.args);
4894
4895 free(event);
4896}
4897
4898/**
4899 * pevent_free - free a pevent handle
4900 * @pevent: the pevent handle to free
4901 */
4902void pevent_free(struct pevent *pevent)
4903{
4904 struct cmdline_list *cmdlist = pevent->cmdlist, *cmdnext;
4905 struct func_list *funclist = pevent->funclist, *funcnext;
4906 struct printk_list *printklist = pevent->printklist, *printknext;
4907 struct pevent_function_handler *func_handler;
4908 struct event_handler *handle;
4909 int i;
4910
4911 pevent->ref_count--;
4912 if (pevent->ref_count)
4913 return;
4914
4915 if (pevent->cmdlines) {
4916 for (i = 0; i < pevent->cmdline_count; i++)
4917 free(pevent->cmdlines[i].comm);
4918 free(pevent->cmdlines);
4919 }
4920
4921 while (cmdlist) {
4922 cmdnext = cmdlist->next;
4923 free(cmdlist->comm);
4924 free(cmdlist);
4925 cmdlist = cmdnext;
4926 }
4927
4928 if (pevent->func_map) {
4929 for (i = 0; i < pevent->func_count; i++) {
4930 free(pevent->func_map[i].func);
4931 free(pevent->func_map[i].mod);
4932 }
4933 free(pevent->func_map);
4934 }
4935
4936 while (funclist) {
4937 funcnext = funclist->next;
4938 free(funclist->func);
4939 free(funclist->mod);
4940 free(funclist);
4941 funclist = funcnext;
4942 }
4943
4944 while (pevent->func_handlers) {
4945 func_handler = pevent->func_handlers;
4946 pevent->func_handlers = func_handler->next;
4947 free_func_handle(func_handler);
4948 }
4949
4950 if (pevent->printk_map) {
4951 for (i = 0; i < pevent->printk_count; i++)
4952 free(pevent->printk_map[i].printk);
4953 free(pevent->printk_map);
4954 }
4955
4956 while (printklist) {
4957 printknext = printklist->next;
4958 free(printklist->printk);
4959 free(printklist);
4960 printklist = printknext;
4961 }
4962
4963 for (i = 0; i < pevent->nr_events; i++)
4964 free_event(pevent->events[i]);
4965
4966 while (pevent->handlers) {
4967 handle = pevent->handlers;
4968 pevent->handlers = handle->next;
4969 free_handler(handle);
4970 }
4971
4972 free(pevent->events);
4973 free(pevent->sort_events);
4974
4975 free(pevent);
4976}
4977
4978void pevent_unref(struct pevent *pevent)
4979{
4980 pevent_free(pevent);
4981}
Linux kernel - Deliverables
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