[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
#define MAX_PROBES 128

/* 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 = zalloc(len + 1);
	if (!buf)
		die("Failed to allocate memory for binding arguments.");
	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_LIBDWARF
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",
	"perf probe --line 'LINEDESC'",
	NULL
};

static const struct option options[] = {
	OPT_BOOLEAN('v', "verbose", &verbose,
		    "be more verbose (show parsed arguments, etc)"),
#ifndef NO_LIBDWARF
	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_LIBDWARF
		"[EVENT=]FUNC[+OFFS|%return] [ARG ...]",
#else
		"[EVENT=]FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
#endif
		"probe point definition, where\n"
		"\t\tGROUP:\tGroup name (optional)\n"
		"\t\tEVENT:\tEvent name\n"
		"\t\tFUNC:\tFunction name\n"
		"\t\tOFFS:\tOffset from function entry (in byte)\n"
		"\t\t%return:\tPut the probe at function return\n"
#ifdef NO_LIBDWARF
		"\t\tARG:\tProbe argument (only \n"
#else
		"\t\tSRC:\tSource code path\n"
		"\t\tRLN:\tRelative line number from function entry.\n"
		"\t\tALN:\tAbsolute line number in file.\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_LIBDWARF
	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_LIBDWARF
	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_LIBDWARF
	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_LIBDWARF
		die("Debuginfo-analysis is not supported");
#else	/* !NO_LIBDWARF */
		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_probepoint(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_LIBDWARF */

	/* 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 MH	49	#define MAX_PATH_LEN 256
	50	#define MAX_PROBES 128
	51
	52	/* Session management structure */
	53	static struct {
fac13fd5 MH	54	bool need_dwarf;
fac13fd5 MH	55	bool list_events;
d761b08b	56	bool force_add;
631c9def	57	bool show_lines;
4ea42b18 MH	58	int nr_probe;
4ea42b18 MH	59	struct probe_point probes[MAX_PROBES];
fa28244d	60	struct strlist *dellist;
8ad94c60 ACM	61	struct map_groups kmap_groups;
8ad94c60 ACM	62	struct map *kmaps[MAP__NR_TYPES];
631c9def	63	struct line_range line_range;
4ea42b18 MH	64	} session;
4ea42b18 MH	65
4de189fe	66
253977b0 MH	67	/* Parse an event definition. Note that any error must die. */
253977b0 MH	68	static void parse_probe_event(const char *str)
4ea42b18	69	{
4ea42b18	70	struct probe_point *pp = &session.probes[session.nr_probe];
4ea42b18	71
b7cb10e7	72	pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
4ea42b18	73	if (++session.nr_probe == MAX_PROBES)
50656eec	74	die("Too many probes (> %d) are specified.", MAX_PROBES);
4ea42b18	75
50656eec	76	/* Parse perf-probe event into probe_point */
fac13fd5	77	parse_perf_probe_event(str, pp, &session.need_dwarf);
23e8ec0d	78
b7cb10e7	79	pr_debug("%d arguments\n", pp->nr_args);
46ab4926 MH	80	}
46ab4926 MH	81
d1bde3f7 MH	82	static void parse_probe_event_argv(int argc, const char **argv)
	83	{
	84	int i, len;
	85	char *buf;
	86
	87	/* Bind up rest arguments */
	88	len = 0;
	89	for (i = 0; i < argc; i++)
	90	len += strlen(argv[i]) + 1;
	91	buf = zalloc(len + 1);
	92	if (!buf)
	93	die("Failed to allocate memory for binding arguments.");
	94	len = 0;
	95	for (i = 0; i < argc; i++)
	96	len += sprintf(&buf[len], "%s ", argv[i]);
	97	parse_probe_event(buf);
	98	free(buf);
	99	}
	100
253977b0	101	static int opt_add_probe_event(const struct option *opt __used,
46ab4926 MH	102	const char *str, int unset __used)
	103	{
	104	if (str)
253977b0	105	parse_probe_event(str);
4ea42b18 MH	106	return 0;
	107	}
	108
fa28244d MH	109	static int opt_del_probe_event(const struct option *opt __used,
	110	const char *str, int unset __used)
	111	{
	112	if (str) {
	113	if (!session.dellist)
	114	session.dellist = strlist__new(true, NULL);
	115	strlist__add(session.dellist, str);
	116	}
	117	return 0;
	118	}
	119
62bdc1b3 MH	120	/* Currently just checking function name from symbol map */
	121	static void evaluate_probe_point(struct probe_point *pp)
	122	{
	123	struct symbol *sym;
8ad94c60 ACM	124	sym = map__find_symbol_by_name(session.kmaps[MAP__FUNCTION],
8ad94c60 ACM	125	pp->function, NULL);
62bdc1b3 MH	126	if (!sym)
	127	die("Kernel symbol \'%s\' not found - probe not added.",
	128	pp->function);
	129	}
	130
23e8ec0d	131	#ifndef NO_LIBDWARF
a128168d	132	static int open_vmlinux(void)
4ea42b18	133	{
8ad94c60	134	if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) {
a128168d MH	135	pr_debug("Failed to load kernel map.\n");
a128168d MH	136	return -EINVAL;
4ea42b18	137	}
8ad94c60 ACM	138	pr_debug("Try to open %s\n",
	139	session.kmaps[MAP__FUNCTION]->dso->long_name);
	140	return open(session.kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
4ea42b18	141	}
0eda7385 HM	142
	143	static int opt_show_lines(const struct option *opt __used,
	144	const char *str, int unset __used)
	145	{
	146	if (str)
	147	parse_line_range_desc(str, &session.line_range);
	148	INIT_LIST_HEAD(&session.line_range.line_list);
	149	session.show_lines = true;
	150	return 0;
	151	}
23e8ec0d	152	#endif
4ea42b18 MH	153
4ea42b18 MH	154	static const char * const probe_usage[] = {
46ab4926 MH	155	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
46ab4926 MH	156	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
fa28244d	157	"perf probe [<options>] --del '[GROUP:]EVENT' ...",
4de189fe	158	"perf probe --list",
631c9def	159	"perf probe --line 'LINEDESC'",
4ea42b18 MH	160	NULL
	161	};
	162
	163	static const struct option options[] = {
89c69c0e MH	164	OPT_BOOLEAN('v', "verbose", &verbose,
89c69c0e MH	165	"be more verbose (show parsed arguments, etc)"),
23e8ec0d	166	#ifndef NO_LIBDWARF
75be6cf4	167	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
a128168d	168	"file", "vmlinux pathname"),
23e8ec0d	169	#endif
fac13fd5 MH	170	OPT_BOOLEAN('l', "list", &session.list_events,
fac13fd5 MH	171	"list up current probe events"),
fa28244d MH	172	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
fa28244d MH	173	opt_del_probe_event),
46ab4926	174	OPT_CALLBACK('a', "add", NULL,
23e8ec0d	175	#ifdef NO_LIBDWARF
af663d75	176	"[EVENT=]FUNC[+OFFS\|%return] [ARG ...]",
23e8ec0d	177	#else
af663d75	178	"[EVENT=]FUNC[+OFFS\|%return\|:RLN][@SRC]\|SRC:ALN [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 MH	183	"\t\tFUNC:\tFunction name\n"
4ea42b18 MH	184	"\t\tOFFS:\tOffset from function entry (in byte)\n"
253977b0	185	"\t\t%return:\tPut the probe at function return\n"
23e8ec0d MH	186	#ifdef NO_LIBDWARF
	187	"\t\tARG:\tProbe argument (only \n"
	188	#else
4ea42b18	189	"\t\tSRC:\tSource code path\n"
b0ef0732 MH	190	"\t\tRLN:\tRelative line number from function entry.\n"
b0ef0732 MH	191	"\t\tALN:\tAbsolute line number in file.\n"
4ea42b18	192	"\t\tARG:\tProbe argument (local variable name or\n"
23e8ec0d	193	#endif
50656eec	194	"\t\t\tkprobe-tracer argument format.)\n",
253977b0	195	opt_add_probe_event),
d761b08b MH	196	OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
d761b08b MH	197	" with existing name"),
631c9def MH	198	#ifndef NO_LIBDWARF
	199	OPT_CALLBACK('L', "line", NULL,
	200	"FUNC[:RLN[+NUM\|:RLN2]]\|SRC:ALN[+NUM\|:ALN2]",
	201	"Show source code lines.", opt_show_lines),
	202	#endif
4ea42b18 MH	203	OPT_END()
	204	};
	205
631c9def MH	206	/* Initialize symbol maps for vmlinux */
	207	static void init_vmlinux(void)
	208	{
	209	symbol_conf.sort_by_name = true;
	210	if (symbol_conf.vmlinux_name == NULL)
	211	symbol_conf.try_vmlinux_path = true;
	212	else
	213	pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
	214	if (symbol__init() < 0)
	215	die("Failed to init symbol map.");
8ad94c60 ACM	216
	217	map_groups__init(&session.kmap_groups);
	218	if (map_groups__create_kernel_maps(&session.kmap_groups,
	219	session.kmaps) < 0)
	220	die("Failed to create kernel maps.");
631c9def MH	221	}
631c9def MH	222
4ea42b18 MH	223	int cmd_probe(int argc, const char *argv, const char prefix __used)
4ea42b18 MH	224	{
d1bde3f7	225	int i, ret;
bdad0db7 XG	226	#ifndef NO_LIBDWARF
	227	int fd;
	228	#endif
4ea42b18	229	struct probe_point *pp;
4ea42b18 MH	230
4ea42b18 MH	231	argc = parse_options(argc, argv, options, probe_usage,
46ab4926	232	PARSE_OPT_STOP_AT_NON_OPTION);
ce11a603 MH	233	if (argc > 0) {
	234	if (strcmp(argv[0], "-") == 0) {
	235	pr_warning(" Error: '-' is not supported.\n");
	236	usage_with_options(probe_usage, options);
	237	}
d1bde3f7	238	parse_probe_event_argv(argc, argv);
ce11a603	239	}
46ab4926	240
631c9def MH	241	if ((!session.nr_probe && !session.dellist && !session.list_events &&
631c9def MH	242	!session.show_lines))
4ea42b18 MH	243	usage_with_options(probe_usage, options);
4ea42b18 MH	244
96c96612 MH	245	if (debugfs_valid_mountpoint(debugfs_path) < 0)
	246	die("Failed to find debugfs path.");
	247
fac13fd5	248	if (session.list_events) {
fa28244d MH	249	if (session.nr_probe != 0 \|\| session.dellist) {
	250	pr_warning(" Error: Don't use --list with"
	251	" --add/--del.\n");
	252	usage_with_options(probe_usage, options);
	253	}
631c9def MH	254	if (session.show_lines) {
	255	pr_warning(" Error: Don't use --list with --line.\n");
	256	usage_with_options(probe_usage, options);
	257	}
4de189fe MH	258	show_perf_probe_events();
	259	return 0;
	260	}
	261
631c9def MH	262	#ifndef NO_LIBDWARF
	263	if (session.show_lines) {
	264	if (session.nr_probe != 0 \|\| session.dellist) {
	265	pr_warning(" Error: Don't use --line with"
	266	" --add/--del.\n");
	267	usage_with_options(probe_usage, options);
	268	}
	269	init_vmlinux();
	270	fd = open_vmlinux();
	271	if (fd < 0)
	272	die("Could not open debuginfo file.");
	273	ret = find_line_range(fd, &session.line_range);
	274	if (ret <= 0)
	275	die("Source line is not found.\n");
	276	close(fd);
	277	show_line_range(&session.line_range);
	278	return 0;
	279	}
	280	#endif
	281
fa28244d MH	282	if (session.dellist) {
	283	del_trace_kprobe_events(session.dellist);
	284	strlist__delete(session.dellist);
	285	if (session.nr_probe == 0)
	286	return 0;
	287	}
	288
631c9def MH	289	/* Add probes */
631c9def MH	290	init_vmlinux();
a128168d	291
23e8ec0d	292	if (session.need_dwarf)
a225a1d9	293	#ifdef NO_LIBDWARF
50656eec	294	die("Debuginfo-analysis is not supported");
a225a1d9	295	#else /* !NO_LIBDWARF */
f41b1e43	296	pr_debug("Some probes require debuginfo.\n");
4ea42b18	297
a128168d	298	fd = open_vmlinux();
a225a1d9 MH	299	if (fd < 0) {
a225a1d9 MH	300	if (session.need_dwarf)
f984f03d	301	die("Could not open debuginfo file.");
a225a1d9	302
d3a2dbf8 MH	303	pr_debug("Could not open vmlinux/module file."
d3a2dbf8 MH	304	" Try to use symbols.\n");
a225a1d9 MH	305	goto end_dwarf;
a225a1d9 MH	306	}
4ea42b18 MH	307
4ea42b18 MH	308	/* Searching probe points */
d1bde3f7 MH	309	for (i = 0; i < session.nr_probe; i++) {
d1bde3f7 MH	310	pp = &session.probes[i];
4ea42b18 MH	311	if (pp->found)
	312	continue;
	313
	314	lseek(fd, SEEK_SET, 0);
	315	ret = find_probepoint(fd, pp);
411edfe5 MH	316	if (ret > 0)
411edfe5 MH	317	continue;
7ef17aaf MH	318	if (ret == 0) { /* No error but failed to find probe point. */
	319	synthesize_perf_probe_point(pp);
	320	die("Probe point '%s' not found. - probe not added.",
	321	pp->probes[0]);
	322	}
411edfe5 MH	323	/* Error path */
	324	if (session.need_dwarf) {
	325	if (ret == -ENOENT)
	326	pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
	327	die("Could not analyze debuginfo.");
	328	}
	329	pr_debug("An error occurred in debuginfo analysis."
	330	" Try to use symbols.\n");
	331	break;
4ea42b18 MH	332	}
	333	close(fd);
	334
a225a1d9	335	end_dwarf:
23e8ec0d MH	336	#endif /* !NO_LIBDWARF */
23e8ec0d MH	337
a225a1d9	338	/* Synthesize probes without dwarf */
d1bde3f7 MH	339	for (i = 0; i < session.nr_probe; i++) {
d1bde3f7 MH	340	pp = &session.probes[i];
a225a1d9 MH	341	if (pp->found) /* This probe is already found. */
	342	continue;
	343
62bdc1b3	344	evaluate_probe_point(pp);
50656eec	345	ret = synthesize_trace_kprobe_event(pp);
a225a1d9	346	if (ret == -E2BIG)
50656eec	347	die("probe point definition becomes too long.");
a225a1d9 MH	348	else if (ret < 0)
	349	die("Failed to synthesize a probe point.");
	350	}
	351
4ea42b18	352	/* Settng up probe points */
d761b08b MH	353	add_trace_kprobe_events(session.probes, session.nr_probe,
d761b08b MH	354	session.force_add);
4ea42b18 MH	355	return 0;
	356	}
	357