[deliverable/linux.git] / tools / perf / builtin-probe.c

/*
 * builtin-probe.c
 *
 * Builtin probe command: Set up probe events by C expression
 *
 * Written by Masami Hiramatsu <mhiramat@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */
#define _GNU_SOURCE
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#undef _GNU_SOURCE
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
#include "util/strlist.h"
#include "util/event.h"
#include "util/debug.h"
#include "util/debugfs.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/parse-options.h"
#include "util/parse-events.h"	/* For debugfs_path */
#include "util/probe-finder.h"
#include "util/probe-event.h"

#define MAX_PATH_LEN 256

/* Session management structure */
static struct {
	bool need_dwarf;
	bool list_events;
	bool force_add;
	bool show_lines;
	int nr_probe;
	struct probe_point probes[MAX_PROBES];
	struct strlist *dellist;
	struct map_groups kmap_groups;
	struct map *kmaps[MAP__NR_TYPES];
	struct line_range line_range;
} session;


/* Parse an event definition. Note that any error must die. */
static void parse_probe_event(const char *str)
{
	struct probe_point *pp = &session.probes[session.nr_probe];

	pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
	if (++session.nr_probe == MAX_PROBES)
		die("Too many probes (> %d) are specified.", MAX_PROBES);

	/* Parse perf-probe event into probe_point */
	parse_perf_probe_event(str, pp, &session.need_dwarf);

	pr_debug("%d arguments\n", pp->nr_args);
}

static void parse_probe_event_argv(int argc, const char **argv)
{
	int i, len;
	char *buf;

	/* Bind up rest arguments */
	len = 0;
	for (i = 0; i < argc; i++)
		len += strlen(argv[i]) + 1;
	buf = xzalloc(len + 1);
	len = 0;
	for (i = 0; i < argc; i++)
		len += sprintf(&buf[len], "%s ", argv[i]);
	parse_probe_event(buf);
	free(buf);
}

static int opt_add_probe_event(const struct option *opt __used,
			      const char *str, int unset __used)
{
	if (str)
		parse_probe_event(str);
	return 0;
}

static int opt_del_probe_event(const struct option *opt __used,
			       const char *str, int unset __used)
{
	if (str) {
		if (!session.dellist)
			session.dellist = strlist__new(true, NULL);
		strlist__add(session.dellist, str);
	}
	return 0;
}

/* Currently just checking function name from symbol map */
static void evaluate_probe_point(struct probe_point *pp)
{
	struct symbol *sym;
	sym = map__find_symbol_by_name(session.kmaps[MAP__FUNCTION],
				       pp->function, NULL);
	if (!sym)
		die("Kernel symbol \'%s\' not found - probe not added.",
		    pp->function);
}

#ifndef NO_DWARF_SUPPORT
static int open_vmlinux(void)
{
	if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) {
		pr_debug("Failed to load kernel map.\n");
		return -EINVAL;
	}
	pr_debug("Try to open %s\n",
		 session.kmaps[MAP__FUNCTION]->dso->long_name);
	return open(session.kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
}

static int opt_show_lines(const struct option *opt __used,
			  const char *str, int unset __used)
{
	if (str)
		parse_line_range_desc(str, &session.line_range);
	INIT_LIST_HEAD(&session.line_range.line_list);
	session.show_lines = true;
	return 0;
}
#endif

static const char * const probe_usage[] = {
	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
	"perf probe [<options>] --del '[GROUP:]EVENT' ...",
	"perf probe --list",
#ifndef NO_DWARF_SUPPORT
	"perf probe --line 'LINEDESC'",
#endif
	NULL
};

static const struct option options[] = {
	OPT_BOOLEAN('v', "verbose", &verbose,
		    "be more verbose (show parsed arguments, etc)"),
#ifndef NO_DWARF_SUPPORT
	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
		   "file", "vmlinux pathname"),
#endif
	OPT_BOOLEAN('l', "list", &session.list_events,
		    "list up current probe events"),
	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
		opt_del_probe_event),
	OPT_CALLBACK('a', "add", NULL,
#ifdef NO_DWARF_SUPPORT
		"[EVENT=]FUNC[+OFF|%return] [ARG ...]",
#else
		"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
		" [ARG ...]",
#endif
		"probe point definition, where\n"
		"\t\tGROUP:\tGroup name (optional)\n"
		"\t\tEVENT:\tEvent name\n"
		"\t\tFUNC:\tFunction name\n"
		"\t\tOFF:\tOffset from function entry (in byte)\n"
		"\t\t%return:\tPut the probe at function return\n"
#ifdef NO_DWARF_SUPPORT
		"\t\tARG:\tProbe argument (only \n"
#else
		"\t\tSRC:\tSource code path\n"
		"\t\tRL:\tRelative line number from function entry.\n"
		"\t\tAL:\tAbsolute line number in file.\n"
		"\t\tPT:\tLazy expression of line code.\n"
		"\t\tARG:\tProbe argument (local variable name or\n"
#endif
		"\t\t\tkprobe-tracer argument format.)\n",
		opt_add_probe_event),
	OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
		    " with existing name"),
#ifndef NO_DWARF_SUPPORT
	OPT_CALLBACK('L', "line", NULL,
		     "FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
		     "Show source code lines.", opt_show_lines),
#endif
	OPT_END()
};

/* Initialize symbol maps for vmlinux */
static void init_vmlinux(void)
{
	symbol_conf.sort_by_name = true;
	if (symbol_conf.vmlinux_name == NULL)
		symbol_conf.try_vmlinux_path = true;
	else
		pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
	if (symbol__init() < 0)
		die("Failed to init symbol map.");

	map_groups__init(&session.kmap_groups);
	if (map_groups__create_kernel_maps(&session.kmap_groups,
					   session.kmaps) < 0)
		die("Failed to create kernel maps.");
}

int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
	int i, ret;
#ifndef NO_DWARF_SUPPORT
	int fd;
#endif
	struct probe_point *pp;

	argc = parse_options(argc, argv, options, probe_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);
	if (argc > 0) {
		if (strcmp(argv[0], "-") == 0) {
			pr_warning("  Error: '-' is not supported.\n");
			usage_with_options(probe_usage, options);
		}
		parse_probe_event_argv(argc, argv);
	}

	if ((!session.nr_probe && !session.dellist && !session.list_events &&
	     !session.show_lines))
		usage_with_options(probe_usage, options);

	if (debugfs_valid_mountpoint(debugfs_path) < 0)
		die("Failed to find debugfs path.");

	if (session.list_events) {
		if (session.nr_probe != 0 || session.dellist) {
			pr_warning("  Error: Don't use --list with"
				   " --add/--del.\n");
			usage_with_options(probe_usage, options);
		}
		if (session.show_lines) {
			pr_warning("  Error: Don't use --list with --line.\n");
			usage_with_options(probe_usage, options);
		}
		show_perf_probe_events();
		return 0;
	}

#ifndef NO_DWARF_SUPPORT
	if (session.show_lines) {
		if (session.nr_probe != 0 || session.dellist) {
			pr_warning("  Error: Don't use --line with"
				   " --add/--del.\n");
			usage_with_options(probe_usage, options);
		}
		init_vmlinux();
		fd = open_vmlinux();
		if (fd < 0)
			die("Could not open debuginfo file.");
		ret = find_line_range(fd, &session.line_range);
		if (ret <= 0)
			die("Source line is not found.\n");
		close(fd);
		show_line_range(&session.line_range);
		return 0;
	}
#endif

	if (session.dellist) {
		del_trace_kprobe_events(session.dellist);
		strlist__delete(session.dellist);
		if (session.nr_probe == 0)
			return 0;
	}

	/* Add probes */
	init_vmlinux();

	if (session.need_dwarf)
#ifdef NO_DWARF_SUPPORT
		die("Debuginfo-analysis is not supported");
#else	/* !NO_DWARF_SUPPORT */
		pr_debug("Some probes require debuginfo.\n");

	fd = open_vmlinux();
	if (fd < 0) {
		if (session.need_dwarf)
			die("Could not open debuginfo file.");

		pr_debug("Could not open vmlinux/module file."
			 " Try to use symbols.\n");
		goto end_dwarf;
	}

	/* Searching probe points */
	for (i = 0; i < session.nr_probe; i++) {
		pp = &session.probes[i];
		if (pp->found)
			continue;

		lseek(fd, SEEK_SET, 0);
		ret = find_probe_point(fd, pp);
		if (ret > 0)
			continue;
		if (ret == 0) {	/* No error but failed to find probe point. */
			synthesize_perf_probe_point(pp);
			die("Probe point '%s' not found. - probe not added.",
			    pp->probes[0]);
		}
		/* Error path */
		if (session.need_dwarf) {
			if (ret == -ENOENT)
				pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
			die("Could not analyze debuginfo.");
		}
		pr_debug("An error occurred in debuginfo analysis."
			 " Try to use symbols.\n");
		break;
	}
	close(fd);

end_dwarf:
#endif /* !NO_DWARF_SUPPORT */

	/* Synthesize probes without dwarf */
	for (i = 0; i < session.nr_probe; i++) {
		pp = &session.probes[i];
		if (pp->found)	/* This probe is already found. */
			continue;

		evaluate_probe_point(pp);
		ret = synthesize_trace_kprobe_event(pp);
		if (ret == -E2BIG)
			die("probe point definition becomes too long.");
		else if (ret < 0)
			die("Failed to synthesize a probe point.");
	}

	/* Settng up probe points */
	add_trace_kprobe_events(session.probes, session.nr_probe,
				session.force_add);
	return 0;
}
Commit	Line	Data
4ea42b18 MH	1	/*
	2	* builtin-probe.c
	3	*
	4	* Builtin probe command: Set up probe events by C expression
	5	*
	6	* Written by Masami Hiramatsu <mhiramat@redhat.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	21	*
	22	*/
	23	#define _GNU_SOURCE
	24	#include <sys/utsname.h>
	25	#include <sys/types.h>
	26	#include <sys/stat.h>
	27	#include <fcntl.h>
	28	#include <errno.h>
	29	#include <stdio.h>
	30	#include <unistd.h>
	31	#include <stdlib.h>
	32	#include <string.h>
	33
	34	#undef _GNU_SOURCE
	35	#include "perf.h"
	36	#include "builtin.h"
	37	#include "util/util.h"
fa28244d	38	#include "util/strlist.h"
89c69c0e MH	39	#include "util/event.h"
89c69c0e MH	40	#include "util/debug.h"
96c96612	41	#include "util/debugfs.h"
a128168d MH	42	#include "util/symbol.h"
a128168d MH	43	#include "util/thread.h"
4ea42b18 MH	44	#include "util/parse-options.h"
	45	#include "util/parse-events.h" /* For debugfs_path */
	46	#include "util/probe-finder.h"
50656eec	47	#include "util/probe-event.h"
4ea42b18	48
4ea42b18	49	#define MAX_PATH_LEN 256
4ea42b18 MH	50
	51	/* Session management structure */
	52	static struct {
fac13fd5 MH	53	bool need_dwarf;
fac13fd5 MH	54	bool list_events;
d761b08b	55	bool force_add;
631c9def	56	bool show_lines;
4ea42b18 MH	57	int nr_probe;
4ea42b18 MH	58	struct probe_point probes[MAX_PROBES];
fa28244d	59	struct strlist *dellist;
8ad94c60 ACM	60	struct map_groups kmap_groups;
8ad94c60 ACM	61	struct map *kmaps[MAP__NR_TYPES];
631c9def	62	struct line_range line_range;
4ea42b18 MH	63	} session;
4ea42b18 MH	64
4de189fe	65
253977b0 MH	66	/* Parse an event definition. Note that any error must die. */
253977b0 MH	67	static void parse_probe_event(const char *str)
4ea42b18	68	{
4ea42b18	69	struct probe_point *pp = &session.probes[session.nr_probe];
4ea42b18	70
b7cb10e7	71	pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
4ea42b18	72	if (++session.nr_probe == MAX_PROBES)
50656eec	73	die("Too many probes (> %d) are specified.", MAX_PROBES);
4ea42b18	74
50656eec	75	/* Parse perf-probe event into probe_point */
fac13fd5	76	parse_perf_probe_event(str, pp, &session.need_dwarf);
23e8ec0d	77
b7cb10e7	78	pr_debug("%d arguments\n", pp->nr_args);
46ab4926 MH	79	}
46ab4926 MH	80
d1bde3f7 MH	81	static void parse_probe_event_argv(int argc, const char **argv)
	82	{
	83	int i, len;
	84	char *buf;
	85
	86	/* Bind up rest arguments */
	87	len = 0;
	88	for (i = 0; i < argc; i++)
	89	len += strlen(argv[i]) + 1;
31facc5f	90	buf = xzalloc(len + 1);
d1bde3f7 MH	91	len = 0;
	92	for (i = 0; i < argc; i++)
	93	len += sprintf(&buf[len], "%s ", argv[i]);
	94	parse_probe_event(buf);
	95	free(buf);
	96	}
	97
253977b0	98	static int opt_add_probe_event(const struct option *opt __used,
46ab4926 MH	99	const char *str, int unset __used)
	100	{
	101	if (str)
253977b0	102	parse_probe_event(str);
4ea42b18 MH	103	return 0;
	104	}
	105
fa28244d MH	106	static int opt_del_probe_event(const struct option *opt __used,
	107	const char *str, int unset __used)
	108	{
	109	if (str) {
	110	if (!session.dellist)
	111	session.dellist = strlist__new(true, NULL);
	112	strlist__add(session.dellist, str);
	113	}
	114	return 0;
	115	}
	116
62bdc1b3 MH	117	/* Currently just checking function name from symbol map */
	118	static void evaluate_probe_point(struct probe_point *pp)
	119	{
	120	struct symbol *sym;
8ad94c60 ACM	121	sym = map__find_symbol_by_name(session.kmaps[MAP__FUNCTION],
8ad94c60 ACM	122	pp->function, NULL);
62bdc1b3 MH	123	if (!sym)
	124	die("Kernel symbol \'%s\' not found - probe not added.",
	125	pp->function);
	126	}
	127
804b3606	128	#ifndef NO_DWARF_SUPPORT
a128168d	129	static int open_vmlinux(void)
4ea42b18	130	{
8ad94c60	131	if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) {
a128168d MH	132	pr_debug("Failed to load kernel map.\n");
a128168d MH	133	return -EINVAL;
4ea42b18	134	}
8ad94c60 ACM	135	pr_debug("Try to open %s\n",
	136	session.kmaps[MAP__FUNCTION]->dso->long_name);
	137	return open(session.kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
4ea42b18	138	}
0eda7385 HM	139
	140	static int opt_show_lines(const struct option *opt __used,
	141	const char *str, int unset __used)
	142	{
	143	if (str)
	144	parse_line_range_desc(str, &session.line_range);
	145	INIT_LIST_HEAD(&session.line_range.line_list);
	146	session.show_lines = true;
	147	return 0;
	148	}
23e8ec0d	149	#endif
4ea42b18 MH	150
4ea42b18 MH	151	static const char * const probe_usage[] = {
46ab4926 MH	152	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
46ab4926 MH	153	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
fa28244d	154	"perf probe [<options>] --del '[GROUP:]EVENT' ...",
4de189fe	155	"perf probe --list",
804b3606	156	#ifndef NO_DWARF_SUPPORT
631c9def	157	"perf probe --line 'LINEDESC'",
f3ab481c	158	#endif
4ea42b18 MH	159	NULL
	160	};
	161
	162	static const struct option options[] = {
89c69c0e MH	163	OPT_BOOLEAN('v', "verbose", &verbose,
89c69c0e MH	164	"be more verbose (show parsed arguments, etc)"),
804b3606	165	#ifndef NO_DWARF_SUPPORT
75be6cf4	166	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
a128168d	167	"file", "vmlinux pathname"),
23e8ec0d	168	#endif
fac13fd5 MH	169	OPT_BOOLEAN('l', "list", &session.list_events,
fac13fd5 MH	170	"list up current probe events"),
fa28244d MH	171	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
fa28244d MH	172	opt_del_probe_event),
46ab4926	173	OPT_CALLBACK('a', "add", NULL,
804b3606	174	#ifdef NO_DWARF_SUPPORT
2a9c8c36	175	"[EVENT=]FUNC[+OFF\|%return] [ARG ...]",
23e8ec0d	176	#else
32cb0dd5	177	"[EVENT=]FUNC[@SRC][+OFF\|%return\|:RL\|;PT]\|SRC:AL\|SRC;PT"
2a9c8c36	178	" [ARG ...]",
23e8ec0d	179	#endif
4ea42b18	180	"probe point definition, where\n"
af663d75 MH	181	"\t\tGROUP:\tGroup name (optional)\n"
af663d75 MH	182	"\t\tEVENT:\tEvent name\n"
4ea42b18	183	"\t\tFUNC:\tFunction name\n"
2a9c8c36	184	"\t\tOFF:\tOffset from function entry (in byte)\n"
253977b0	185	"\t\t%return:\tPut the probe at function return\n"
804b3606	186	#ifdef NO_DWARF_SUPPORT
23e8ec0d MH	187	"\t\tARG:\tProbe argument (only \n"
23e8ec0d MH	188	#else
4ea42b18	189	"\t\tSRC:\tSource code path\n"
2a9c8c36 MH	190	"\t\tRL:\tRelative line number from function entry.\n"
	191	"\t\tAL:\tAbsolute line number in file.\n"
	192	"\t\tPT:\tLazy expression of line code.\n"
4ea42b18	193	"\t\tARG:\tProbe argument (local variable name or\n"
23e8ec0d	194	#endif
50656eec	195	"\t\t\tkprobe-tracer argument format.)\n",
253977b0	196	opt_add_probe_event),
d761b08b MH	197	OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
d761b08b MH	198	" with existing name"),
804b3606	199	#ifndef NO_DWARF_SUPPORT
631c9def MH	200	OPT_CALLBACK('L', "line", NULL,
	201	"FUNC[:RLN[+NUM\|:RLN2]]\|SRC:ALN[+NUM\|:ALN2]",
	202	"Show source code lines.", opt_show_lines),
	203	#endif
4ea42b18 MH	204	OPT_END()
	205	};
	206
631c9def MH	207	/* Initialize symbol maps for vmlinux */
	208	static void init_vmlinux(void)
	209	{
	210	symbol_conf.sort_by_name = true;
	211	if (symbol_conf.vmlinux_name == NULL)
	212	symbol_conf.try_vmlinux_path = true;
	213	else
	214	pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
	215	if (symbol__init() < 0)
	216	die("Failed to init symbol map.");
8ad94c60 ACM	217
	218	map_groups__init(&session.kmap_groups);
	219	if (map_groups__create_kernel_maps(&session.kmap_groups,
	220	session.kmaps) < 0)
	221	die("Failed to create kernel maps.");
631c9def MH	222	}
631c9def MH	223
4ea42b18 MH	224	int cmd_probe(int argc, const char *argv, const char prefix __used)
4ea42b18 MH	225	{
d1bde3f7	226	int i, ret;
804b3606	227	#ifndef NO_DWARF_SUPPORT
bdad0db7 XG	228	int fd;
bdad0db7 XG	229	#endif
4ea42b18	230	struct probe_point *pp;
4ea42b18 MH	231
4ea42b18 MH	232	argc = parse_options(argc, argv, options, probe_usage,
46ab4926	233	PARSE_OPT_STOP_AT_NON_OPTION);
ce11a603 MH	234	if (argc > 0) {
	235	if (strcmp(argv[0], "-") == 0) {
	236	pr_warning(" Error: '-' is not supported.\n");
	237	usage_with_options(probe_usage, options);
	238	}
d1bde3f7	239	parse_probe_event_argv(argc, argv);
ce11a603	240	}
46ab4926	241
631c9def MH	242	if ((!session.nr_probe && !session.dellist && !session.list_events &&
631c9def MH	243	!session.show_lines))
4ea42b18 MH	244	usage_with_options(probe_usage, options);
4ea42b18 MH	245
96c96612 MH	246	if (debugfs_valid_mountpoint(debugfs_path) < 0)
	247	die("Failed to find debugfs path.");
	248
fac13fd5	249	if (session.list_events) {
fa28244d MH	250	if (session.nr_probe != 0 \|\| session.dellist) {
	251	pr_warning(" Error: Don't use --list with"
	252	" --add/--del.\n");
	253	usage_with_options(probe_usage, options);
	254	}
631c9def MH	255	if (session.show_lines) {
	256	pr_warning(" Error: Don't use --list with --line.\n");
	257	usage_with_options(probe_usage, options);
	258	}
4de189fe MH	259	show_perf_probe_events();
	260	return 0;
	261	}
	262
804b3606	263	#ifndef NO_DWARF_SUPPORT
631c9def MH	264	if (session.show_lines) {
	265	if (session.nr_probe != 0 \|\| session.dellist) {
	266	pr_warning(" Error: Don't use --line with"
	267	" --add/--del.\n");
	268	usage_with_options(probe_usage, options);
	269	}
	270	init_vmlinux();
	271	fd = open_vmlinux();
	272	if (fd < 0)
	273	die("Could not open debuginfo file.");
	274	ret = find_line_range(fd, &session.line_range);
	275	if (ret <= 0)
	276	die("Source line is not found.\n");
	277	close(fd);
	278	show_line_range(&session.line_range);
	279	return 0;
	280	}
	281	#endif
	282
fa28244d MH	283	if (session.dellist) {
	284	del_trace_kprobe_events(session.dellist);
	285	strlist__delete(session.dellist);
	286	if (session.nr_probe == 0)
	287	return 0;
	288	}
	289
631c9def MH	290	/* Add probes */
631c9def MH	291	init_vmlinux();
a128168d	292
23e8ec0d	293	if (session.need_dwarf)
804b3606	294	#ifdef NO_DWARF_SUPPORT
50656eec	295	die("Debuginfo-analysis is not supported");
804b3606	296	#else /* !NO_DWARF_SUPPORT */
f41b1e43	297	pr_debug("Some probes require debuginfo.\n");
4ea42b18	298
a128168d	299	fd = open_vmlinux();
a225a1d9 MH	300	if (fd < 0) {
a225a1d9 MH	301	if (session.need_dwarf)
f984f03d	302	die("Could not open debuginfo file.");
a225a1d9	303
d3a2dbf8 MH	304	pr_debug("Could not open vmlinux/module file."
d3a2dbf8 MH	305	" Try to use symbols.\n");
a225a1d9 MH	306	goto end_dwarf;
a225a1d9 MH	307	}
4ea42b18 MH	308
4ea42b18 MH	309	/* Searching probe points */
d1bde3f7 MH	310	for (i = 0; i < session.nr_probe; i++) {
d1bde3f7 MH	311	pp = &session.probes[i];
4ea42b18 MH	312	if (pp->found)
	313	continue;
	314
	315	lseek(fd, SEEK_SET, 0);
81cb8aa3	316	ret = find_probe_point(fd, pp);
411edfe5 MH	317	if (ret > 0)
411edfe5 MH	318	continue;
7ef17aaf MH	319	if (ret == 0) { /* No error but failed to find probe point. */
	320	synthesize_perf_probe_point(pp);
	321	die("Probe point '%s' not found. - probe not added.",
	322	pp->probes[0]);
	323	}
411edfe5 MH	324	/* Error path */
	325	if (session.need_dwarf) {
	326	if (ret == -ENOENT)
	327	pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
	328	die("Could not analyze debuginfo.");
	329	}
	330	pr_debug("An error occurred in debuginfo analysis."
	331	" Try to use symbols.\n");
	332	break;
4ea42b18 MH	333	}
	334	close(fd);
	335
a225a1d9	336	end_dwarf:
804b3606	337	#endif /* !NO_DWARF_SUPPORT */
23e8ec0d	338
a225a1d9	339	/* Synthesize probes without dwarf */
d1bde3f7 MH	340	for (i = 0; i < session.nr_probe; i++) {
d1bde3f7 MH	341	pp = &session.probes[i];
a225a1d9 MH	342	if (pp->found) /* This probe is already found. */
	343	continue;
	344
62bdc1b3	345	evaluate_probe_point(pp);
50656eec	346	ret = synthesize_trace_kprobe_event(pp);
a225a1d9	347	if (ret == -E2BIG)
50656eec	348	die("probe point definition becomes too long.");
a225a1d9 MH	349	else if (ret < 0)
	350	die("Failed to synthesize a probe point.");
	351	}
	352
4ea42b18	353	/* Settng up probe points */
d761b08b MH	354	add_trace_kprobe_events(session.probes, session.nr_probe,
d761b08b MH	355	session.force_add);
4ea42b18 MH	356	return 0;
	357	}
	358