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