[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/event.h"
#include "util/debug.h"
#include "util/parse-options.h"
#include "util/parse-events.h"	/* For debugfs_path */
#include "util/probe-finder.h"

/* Default vmlinux search paths */
#define NR_SEARCH_PATH 3
const char *default_search_path[NR_SEARCH_PATH] = {
"/lib/modules/%s/build/vmlinux",		/* Custom build kernel */
"/usr/lib/debug/lib/modules/%s/vmlinux",	/* Red Hat debuginfo */
"/boot/vmlinux-debug-%s",			/* Ubuntu */
};

#define MAX_PATH_LEN 256
#define MAX_PROBES 128
#define MAX_PROBE_ARGS 128

/* Session management structure */
static struct {
	char *vmlinux;
	char *release;
	int need_dwarf;
	int nr_probe;
	struct probe_point probes[MAX_PROBES];
	char *events[MAX_PROBES];
} session;

#define semantic_error(msg ...) die("Semantic error :" msg)

/* Parse a probe point. Note that any error must die. */
static void parse_probepoint(const char *str)
{
	char *argv[MAX_PROBE_ARGS + 2];	/* Event + probe + args */
	int argc, i;
	char *arg, *ptr;
	struct probe_point *pp = &session.probes[session.nr_probe];
	char **event = &session.events[session.nr_probe];
	int retp = 0;

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

	/* Separate arguments, similar to argv_split */
	argc = 0;
	do {
		/* Skip separators */
		while (isspace(*str))
			str++;

		/* Add an argument */
		if (*str != '\0') {
			const char *s = str;

			/* Skip the argument */
			while (!isspace(*str) && *str != '\0')
				str++;

			/* Duplicate the argument */
			argv[argc] = strndup(s, str - s);
			if (argv[argc] == NULL)
				die("strndup");
			if (++argc == MAX_PROBE_ARGS)
				semantic_error("Too many arguments");
			pr_debug("argv[%d]=%s\n", argc, argv[argc - 1]);
		}
	} while (*str != '\0');
	if (argc < 2)
		semantic_error("Need event-name and probe-point at least.");

	/* Parse the event name */
	if (argv[0][0] == 'r')
		retp = 1;
	else if (argv[0][0] != 'p')
		semantic_error("You must specify 'p'(kprobe) or"
				" 'r'(kretprobe) first.");
	/* TODO: check event name */
	*event = argv[0];

	/* Parse probe point */
	arg = argv[1];
	if (arg[0] == '@') {
		/* Source Line */
		arg++;
		ptr = strchr(arg, ':');
		if (!ptr || !isdigit(ptr[1]))
			semantic_error("Line number is required.");
		*ptr++ = '\0';
		if (strlen(arg) == 0)
			semantic_error("No file name.");
		pp->file = strdup(arg);
		pp->line = atoi(ptr);
		if (!pp->file || !pp->line)
			semantic_error("Failed to parse line.");
		pr_debug("file:%s line:%d\n", pp->file, pp->line);
	} else {
		/* Function name */
		ptr = strchr(arg, '+');
		if (ptr) {
			if (!isdigit(ptr[1]))
				semantic_error("Offset is required.");
			*ptr++ = '\0';
			pp->offset = atoi(ptr);
		} else
			ptr = arg;
		ptr = strchr(ptr, '@');
		if (ptr) {
			*ptr++ = '\0';
			pp->file = strdup(ptr);
		}
		pp->function = strdup(arg);
		pr_debug("symbol:%s file:%s offset:%d\n",
			 pp->function, pp->file, pp->offset);
	}
	free(argv[1]);
	if (pp->file)
		session.need_dwarf = 1;

	/* Copy arguments */
	pp->nr_args = argc - 2;
	if (pp->nr_args > 0) {
		pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
		if (!pp->args)
			die("malloc");
		memcpy(pp->args, &argv[2], sizeof(char *) * pp->nr_args);
	}

	/* Ensure return probe has no C argument */
	for (i = 0; i < pp->nr_args; i++)
		if (is_c_varname(pp->args[i])) {
			if (retp)
				semantic_error("You can't specify local"
						" variable for kretprobe");
			session.need_dwarf = 1;
		}

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

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

#ifndef NO_LIBDWARF
static int open_default_vmlinux(void)
{
	struct utsname uts;
	char fname[MAX_PATH_LEN];
	int fd, ret, i;

	ret = uname(&uts);
	if (ret) {
		pr_debug("uname() failed.\n");
		return -errno;
	}
	session.release = uts.release;
	for (i = 0; i < NR_SEARCH_PATH; i++) {
		ret = snprintf(fname, MAX_PATH_LEN,
			       default_search_path[i], session.release);
		if (ret >= MAX_PATH_LEN || ret < 0) {
			pr_debug("Filename(%d,%s) is too long.\n", i,
				uts.release);
			errno = E2BIG;
			return -E2BIG;
		}
		pr_debug("try to open %s\n", fname);
		fd = open(fname, O_RDONLY);
		if (fd >= 0)
			break;
	}
	return fd;
}
#endif

static const char * const probe_usage[] = {
	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
	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", &session.vmlinux, "file",
		"vmlinux/module pathname"),
#endif
	OPT_CALLBACK('a', "add", NULL,
#ifdef NO_LIBDWARF
		"p|r:[GRP/]NAME FUNC[+OFFS] [ARG ...]",
#else
		"p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]",
#endif
		"probe point definition, where\n"
		"\t\tp:\tkprobe probe\n"
		"\t\tr:\tkretprobe probe\n"
		"\t\tGRP:\tGroup name (optional)\n"
		"\t\tNAME:\tEvent name\n"
		"\t\tFUNC:\tFunction name\n"
		"\t\tOFFS:\tOffset from function entry (in byte)\n"
#ifdef NO_LIBDWARF
		"\t\tARG:\tProbe argument (only \n"
#else
		"\t\tSRC:\tSource code path\n"
		"\t\tLINE:\tLine number\n"
		"\t\tARG:\tProbe argument (local variable name or\n"
#endif
		"\t\t\tkprobe-tracer argument format is supported.)\n",
		opt_add_probepoint),
	OPT_END()
};

static int write_new_event(int fd, const char *buf)
{
	int ret;

	printf("Adding new event: %s\n", buf);
	ret = write(fd, buf, strlen(buf));
	if (ret <= 0)
		die("failed to create event.");

	return ret;
}

#define MAX_CMDLEN 256

static int synthesize_probepoint(struct probe_point *pp)
{
	char *buf;
	int i, len, ret;
	pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
	if (!buf)
		die("calloc");
	ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
	if (ret <= 0 || ret >= MAX_CMDLEN)
		goto error;
	len = ret;

	for (i = 0; i < pp->nr_args; i++) {
		ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
			       pp->args[i]);
		if (ret <= 0 || ret >= MAX_CMDLEN - len)
			goto error;
		len += ret;
	}
	pp->found = 1;
	return pp->found;
error:
	free(pp->probes[0]);
	if (ret > 0)
		ret = -E2BIG;
	return ret;
}

int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
	int i, j, fd, ret;
	struct probe_point *pp;
	char buf[MAX_CMDLEN];

	argc = parse_options(argc, argv, options, probe_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);
	for (i = 0; i < argc; i++)
		parse_probe_event(argv[i]);

	if (session.nr_probe == 0)
		usage_with_options(probe_usage, options);

#ifdef NO_LIBDWARF
	if (session.need_dwarf)
		semantic_error("Dwarf-analysis is not supported");
#endif

	/* Synthesize probes without dwarf */
	for (j = 0; j < session.nr_probe; j++) {
#ifndef NO_LIBDWARF
		if (session.events[j][0] != 'r') {
			session.need_dwarf = 1;
			continue;
		}
#endif
		ret = synthesize_probepoint(&session.probes[j]);
		if (ret == -E2BIG)
			semantic_error("probe point is too long.");
		else if (ret < 0)
			die("snprintf");
	}

#ifndef NO_LIBDWARF
	if (!session.need_dwarf)
		goto setup_probes;

	if (session.vmlinux)
		fd = open(session.vmlinux, O_RDONLY);
	else
		fd = open_default_vmlinux();
	if (fd < 0)
		die("vmlinux/module file open");

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

		lseek(fd, SEEK_SET, 0);
		ret = find_probepoint(fd, pp);
		if (ret <= 0)
			die("No probe point found.\n");
		pr_debug("probe event %s found\n", session.events[j]);
	}
	close(fd);

setup_probes:
#endif /* !NO_LIBDWARF */

	/* Settng up probe points */
	snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
	fd = open(buf, O_WRONLY, O_APPEND);
	if (fd < 0)
		die("kprobe_events open");
	for (j = 0; j < session.nr_probe; j++) {
		pp = &session.probes[j];
		if (pp->found == 1) {
			snprintf(buf, MAX_CMDLEN, "%s %s\n",
				session.events[j], pp->probes[0]);
			write_new_event(fd, buf);
		} else
			for (i = 0; i < pp->found; i++) {
				snprintf(buf, MAX_CMDLEN, "%s%d %s\n",
					session.events[j], i, pp->probes[i]);
				write_new_event(fd, buf);
			}
	}
	close(fd);
	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"
89c69c0e MH	38	#include "util/event.h"
89c69c0e MH	39	#include "util/debug.h"
4ea42b18 MH	40	#include "util/parse-options.h"
	41	#include "util/parse-events.h" /* For debugfs_path */
	42	#include "util/probe-finder.h"
	43
	44	/* Default vmlinux search paths */
	45	#define NR_SEARCH_PATH 3
	46	const char *default_search_path[NR_SEARCH_PATH] = {
	47	"/lib/modules/%s/build/vmlinux", /* Custom build kernel */
	48	"/usr/lib/debug/lib/modules/%s/vmlinux", /* Red Hat debuginfo */
	49	"/boot/vmlinux-debug-%s", /* Ubuntu */
	50	};
	51
	52	#define MAX_PATH_LEN 256
	53	#define MAX_PROBES 128
074fc0e4	54	#define MAX_PROBE_ARGS 128
4ea42b18 MH	55
	56	/* Session management structure */
	57	static struct {
	58	char *vmlinux;
	59	char *release;
23e8ec0d	60	int need_dwarf;
4ea42b18 MH	61	int nr_probe;
	62	struct probe_point probes[MAX_PROBES];
	63	char *events[MAX_PROBES];
	64	} session;
	65
074fc0e4	66	#define semantic_error(msg ...) die("Semantic error :" msg)
4ea42b18	67
46ab4926 MH	68	/* Parse a probe point. Note that any error must die. */
46ab4926 MH	69	static void parse_probepoint(const char *str)
4ea42b18 MH	70	{
	71	char argv[MAX_PROBE_ARGS + 2]; / Event + probe + args */
	72	int argc, i;
	73	char arg, ptr;
	74	struct probe_point *pp = &session.probes[session.nr_probe];
	75	char **event = &session.events[session.nr_probe];
	76	int retp = 0;
	77
b7cb10e7	78	pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
4ea42b18 MH	79	if (++session.nr_probe == MAX_PROBES)
	80	semantic_error("Too many probes");
	81
	82	/* Separate arguments, similar to argv_split */
	83	argc = 0;
	84	do {
	85	/* Skip separators */
	86	while (isspace(*str))
	87	str++;
	88
	89	/* Add an argument */
	90	if (*str != '\0') {
	91	const char *s = str;
	92
	93	/* Skip the argument */
	94	while (!isspace(str) && str != '\0')
	95	str++;
	96
	97	/* Duplicate the argument */
	98	argv[argc] = strndup(s, str - s);
	99	if (argv[argc] == NULL)
074fc0e4	100	die("strndup");
4ea42b18 MH	101	if (++argc == MAX_PROBE_ARGS)
4ea42b18 MH	102	semantic_error("Too many arguments");
b7cb10e7	103	pr_debug("argv[%d]=%s\n", argc, argv[argc - 1]);
4ea42b18 MH	104	}
	105	} while (*str != '\0');
	106	if (argc < 2)
	107	semantic_error("Need event-name and probe-point at least.");
	108
	109	/* Parse the event name */
	110	if (argv[0][0] == 'r')
	111	retp = 1;
	112	else if (argv[0][0] != 'p')
	113	semantic_error("You must specify 'p'(kprobe) or"
	114	" 'r'(kretprobe) first.");
	115	/* TODO: check event name */
	116	*event = argv[0];
	117
	118	/* Parse probe point */
	119	arg = argv[1];
	120	if (arg[0] == '@') {
	121	/* Source Line */
	122	arg++;
	123	ptr = strchr(arg, ':');
	124	if (!ptr \|\| !isdigit(ptr[1]))
	125	semantic_error("Line number is required.");
	126	*ptr++ = '\0';
	127	if (strlen(arg) == 0)
	128	semantic_error("No file name.");
	129	pp->file = strdup(arg);
	130	pp->line = atoi(ptr);
	131	if (!pp->file \|\| !pp->line)
	132	semantic_error("Failed to parse line.");
b7cb10e7	133	pr_debug("file:%s line:%d\n", pp->file, pp->line);
4ea42b18 MH	134	} else {
	135	/* Function name */
	136	ptr = strchr(arg, '+');
	137	if (ptr) {
	138	if (!isdigit(ptr[1]))
	139	semantic_error("Offset is required.");
	140	*ptr++ = '\0';
	141	pp->offset = atoi(ptr);
	142	} else
	143	ptr = arg;
	144	ptr = strchr(ptr, '@');
	145	if (ptr) {
	146	*ptr++ = '\0';
	147	pp->file = strdup(ptr);
	148	}
	149	pp->function = strdup(arg);
b7cb10e7 ACM	150	pr_debug("symbol:%s file:%s offset:%d\n",
b7cb10e7 ACM	151	pp->function, pp->file, pp->offset);
4ea42b18 MH	152	}
4ea42b18 MH	153	free(argv[1]);
23e8ec0d MH	154	if (pp->file)
23e8ec0d MH	155	session.need_dwarf = 1;
4ea42b18 MH	156
	157	/* Copy arguments */
	158	pp->nr_args = argc - 2;
	159	if (pp->nr_args > 0) {
	160	pp->args = (char *)malloc(sizeof(char ) * pp->nr_args);
	161	if (!pp->args)
074fc0e4	162	die("malloc");
4ea42b18 MH	163	memcpy(pp->args, &argv[2], sizeof(char ) pp->nr_args);
	164	}
	165
	166	/* Ensure return probe has no C argument */
23e8ec0d MH	167	for (i = 0; i < pp->nr_args; i++)
	168	if (is_c_varname(pp->args[i])) {
	169	if (retp)
4ea42b18 MH	170	semantic_error("You can't specify local"
4ea42b18 MH	171	" variable for kretprobe");
23e8ec0d MH	172	session.need_dwarf = 1;
	173	}
	174
b7cb10e7	175	pr_debug("%d arguments\n", pp->nr_args);
46ab4926 MH	176	}
	177
	178	static int opt_add_probepoint(const struct option *opt __used,
	179	const char *str, int unset __used)
	180	{
	181	if (str)
	182	parse_probepoint(str);
4ea42b18 MH	183	return 0;
	184	}
	185
23e8ec0d	186	#ifndef NO_LIBDWARF
4ea42b18 MH	187	static int open_default_vmlinux(void)
	188	{
	189	struct utsname uts;
	190	char fname[MAX_PATH_LEN];
	191	int fd, ret, i;
	192
	193	ret = uname(&uts);
	194	if (ret) {
b7cb10e7	195	pr_debug("uname() failed.\n");
4ea42b18 MH	196	return -errno;
	197	}
	198	session.release = uts.release;
	199	for (i = 0; i < NR_SEARCH_PATH; i++) {
	200	ret = snprintf(fname, MAX_PATH_LEN,
	201	default_search_path[i], session.release);
	202	if (ret >= MAX_PATH_LEN \|\| ret < 0) {
b7cb10e7	203	pr_debug("Filename(%d,%s) is too long.\n", i,
89c69c0e	204	uts.release);
4ea42b18 MH	205	errno = E2BIG;
	206	return -E2BIG;
	207	}
b7cb10e7	208	pr_debug("try to open %s\n", fname);
4ea42b18 MH	209	fd = open(fname, O_RDONLY);
	210	if (fd >= 0)
	211	break;
	212	}
	213	return fd;
	214	}
23e8ec0d	215	#endif
4ea42b18 MH	216
4ea42b18 MH	217	static const char * const probe_usage[] = {
46ab4926 MH	218	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
46ab4926 MH	219	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
4ea42b18 MH	220	NULL
	221	};
	222
	223	static const struct option options[] = {
89c69c0e MH	224	OPT_BOOLEAN('v', "verbose", &verbose,
89c69c0e MH	225	"be more verbose (show parsed arguments, etc)"),
23e8ec0d	226	#ifndef NO_LIBDWARF
4ea42b18 MH	227	OPT_STRING('k', "vmlinux", &session.vmlinux, "file",
4ea42b18 MH	228	"vmlinux/module pathname"),
23e8ec0d	229	#endif
46ab4926	230	OPT_CALLBACK('a', "add", NULL,
23e8ec0d MH	231	#ifdef NO_LIBDWARF
	232	"p\|r:[GRP/]NAME FUNC[+OFFS] [ARG ...]",
	233	#else
4ea42b18	234	"p\|r:[GRP/]NAME FUNC[+OFFS][@SRC]\|@SRC:LINE [ARG ...]",
23e8ec0d	235	#endif
4ea42b18 MH	236	"probe point definition, where\n"
	237	"\t\tp:\tkprobe probe\n"
	238	"\t\tr:\tkretprobe probe\n"
	239	"\t\tGRP:\tGroup name (optional)\n"
	240	"\t\tNAME:\tEvent name\n"
	241	"\t\tFUNC:\tFunction name\n"
	242	"\t\tOFFS:\tOffset from function entry (in byte)\n"
23e8ec0d MH	243	#ifdef NO_LIBDWARF
	244	"\t\tARG:\tProbe argument (only \n"
	245	#else
4ea42b18 MH	246	"\t\tSRC:\tSource code path\n"
	247	"\t\tLINE:\tLine number\n"
	248	"\t\tARG:\tProbe argument (local variable name or\n"
23e8ec0d	249	#endif
4ea42b18	250	"\t\t\tkprobe-tracer argument format is supported.)\n",
46ab4926	251	opt_add_probepoint),
4ea42b18 MH	252	OPT_END()
	253	};
	254
	255	static int write_new_event(int fd, const char *buf)
	256	{
	257	int ret;
	258
	259	printf("Adding new event: %s\n", buf);
	260	ret = write(fd, buf, strlen(buf));
	261	if (ret <= 0)
074fc0e4	262	die("failed to create event.");
4ea42b18 MH	263
	264	return ret;
	265	}
	266
	267	#define MAX_CMDLEN 256
	268
	269	static int synthesize_probepoint(struct probe_point *pp)
	270	{
	271	char *buf;
	272	int i, len, ret;
	273	pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
	274	if (!buf)
074fc0e4	275	die("calloc");
4ea42b18 MH	276	ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
	277	if (ret <= 0 \|\| ret >= MAX_CMDLEN)
	278	goto error;
	279	len = ret;
	280
	281	for (i = 0; i < pp->nr_args; i++) {
	282	ret = snprintf(&buf[len], MAX_CMDLEN - len, " %s",
	283	pp->args[i]);
	284	if (ret <= 0 \|\| ret >= MAX_CMDLEN - len)
	285	goto error;
	286	len += ret;
	287	}
	288	pp->found = 1;
	289	return pp->found;
	290	error:
	291	free(pp->probes[0]);
	292	if (ret > 0)
	293	ret = -E2BIG;
	294	return ret;
	295	}
	296
	297	int cmd_probe(int argc, const char *argv, const char prefix __used)
	298	{
23e8ec0d	299	int i, j, fd, ret;
4ea42b18 MH	300	struct probe_point *pp;
	301	char buf[MAX_CMDLEN];
	302
	303	argc = parse_options(argc, argv, options, probe_usage,
46ab4926 MH	304	PARSE_OPT_STOP_AT_NON_OPTION);
	305	for (i = 0; i < argc; i++)
	306	parse_probe_event(argv[i]);
	307
	308	if (session.nr_probe == 0)
4ea42b18 MH	309	usage_with_options(probe_usage, options);
4ea42b18 MH	310
23e8ec0d MH	311	#ifdef NO_LIBDWARF
	312	if (session.need_dwarf)
	313	semantic_error("Dwarf-analysis is not supported");
	314	#endif
	315
	316	/* Synthesize probes without dwarf */
4ea42b18	317	for (j = 0; j < session.nr_probe; j++) {
23e8ec0d	318	#ifndef NO_LIBDWARF
4ea42b18	319	if (session.events[j][0] != 'r') {
23e8ec0d	320	session.need_dwarf = 1;
4ea42b18 MH	321	continue;
4ea42b18 MH	322	}
23e8ec0d	323	#endif
4ea42b18 MH	324	ret = synthesize_probepoint(&session.probes[j]);
	325	if (ret == -E2BIG)
	326	semantic_error("probe point is too long.");
074fc0e4 MH	327	else if (ret < 0)
074fc0e4 MH	328	die("snprintf");
4ea42b18 MH	329	}
4ea42b18 MH	330
23e8ec0d MH	331	#ifndef NO_LIBDWARF
23e8ec0d MH	332	if (!session.need_dwarf)
4ea42b18 MH	333	goto setup_probes;
	334
	335	if (session.vmlinux)
	336	fd = open(session.vmlinux, O_RDONLY);
	337	else
	338	fd = open_default_vmlinux();
074fc0e4 MH	339	if (fd < 0)
074fc0e4 MH	340	die("vmlinux/module file open");
4ea42b18 MH	341
	342	/* Searching probe points */
	343	for (j = 0; j < session.nr_probe; j++) {
	344	pp = &session.probes[j];
	345	if (pp->found)
	346	continue;
	347
	348	lseek(fd, SEEK_SET, 0);
	349	ret = find_probepoint(fd, pp);
074fc0e4 MH	350	if (ret <= 0)
074fc0e4 MH	351	die("No probe point found.\n");
b7cb10e7	352	pr_debug("probe event %s found\n", session.events[j]);
4ea42b18 MH	353	}
	354	close(fd);
	355
	356	setup_probes:
23e8ec0d MH	357	#endif /* !NO_LIBDWARF */
23e8ec0d MH	358
4ea42b18 MH	359	/* Settng up probe points */
	360	snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
	361	fd = open(buf, O_WRONLY, O_APPEND);
074fc0e4 MH	362	if (fd < 0)
074fc0e4 MH	363	die("kprobe_events open");
4ea42b18 MH	364	for (j = 0; j < session.nr_probe; j++) {
	365	pp = &session.probes[j];
	366	if (pp->found == 1) {
	367	snprintf(buf, MAX_CMDLEN, "%s %s\n",
	368	session.events[j], pp->probes[0]);
	369	write_new_event(fd, buf);
	370	} else
	371	for (i = 0; i < pp->found; i++) {
	372	snprintf(buf, MAX_CMDLEN, "%s%d %s\n",
	373	session.events[j], i, pp->probes[i]);
	374	write_new_event(fd, buf);
	375	}
	376	}
	377	close(fd);
	378	return 0;
	379	}
	380