2009-10-08 23:17:38 +02:00
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/*
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* builtin-probe.c
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*
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* Builtin probe command: Set up probe events by C expression
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#define _GNU_SOURCE
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#undef _GNU_SOURCE
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#include "perf.h"
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#include "builtin.h"
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#include "util/util.h"
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2009-10-17 02:08:10 +02:00
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#include "util/event.h"
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#include "util/debug.h"
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2009-10-08 23:17:38 +02:00
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#include "util/parse-options.h"
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#include "util/parse-events.h" /* For debugfs_path */
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#include "util/probe-finder.h"
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/* Default vmlinux search paths */
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#define NR_SEARCH_PATH 3
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const char *default_search_path[NR_SEARCH_PATH] = {
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"/lib/modules/%s/build/vmlinux", /* Custom build kernel */
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"/usr/lib/debug/lib/modules/%s/vmlinux", /* Red Hat debuginfo */
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"/boot/vmlinux-debug-%s", /* Ubuntu */
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};
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#define MAX_PATH_LEN 256
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#define MAX_PROBES 128
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2009-10-17 02:08:01 +02:00
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#define MAX_PROBE_ARGS 128
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2009-10-27 21:43:10 +01:00
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#define PERFPROBE_GROUP "perfprobe"
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2009-10-08 23:17:38 +02:00
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/* Session management structure */
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static struct {
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char *vmlinux;
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char *release;
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2009-10-08 00:28:30 +02:00
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int need_dwarf;
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2009-10-08 23:17:38 +02:00
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int nr_probe;
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struct probe_point probes[MAX_PROBES];
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} session;
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2009-10-17 02:08:01 +02:00
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#define semantic_error(msg ...) die("Semantic error :" msg)
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2009-10-08 23:17:38 +02:00
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2009-10-27 21:43:10 +01:00
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/* Parse probe point. Return 1 if return probe */
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static void parse_probe_point(char *arg, struct probe_point *pp)
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{
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char *ptr, *tmp;
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2009-11-03 14:29:07 +01:00
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char c, nc = 0;
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2009-10-27 21:43:10 +01:00
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/*
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* <Syntax>
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* perf probe SRC:LN
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* perf probe FUNC[+OFFS|%return][@SRC]
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*/
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ptr = strpbrk(arg, ":+@%");
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if (ptr) {
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nc = *ptr;
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*ptr++ = '\0';
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}
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/* Check arg is function or file and copy it */
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if (strchr(arg, '.')) /* File */
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pp->file = strdup(arg);
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else /* Function */
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pp->function = strdup(arg);
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DIE_IF(pp->file == NULL && pp->function == NULL);
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/* Parse other options */
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while (ptr) {
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arg = ptr;
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c = nc;
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ptr = strpbrk(arg, ":+@%");
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if (ptr) {
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nc = *ptr;
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*ptr++ = '\0';
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}
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switch (c) {
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case ':': /* Line number */
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pp->line = strtoul(arg, &tmp, 0);
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if (*tmp != '\0')
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semantic_error("There is non-digit charactor"
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" in line number.");
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break;
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case '+': /* Byte offset from a symbol */
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pp->offset = strtoul(arg, &tmp, 0);
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if (*tmp != '\0')
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semantic_error("There is non-digit charactor"
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" in offset.");
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break;
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case '@': /* File name */
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if (pp->file)
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semantic_error("SRC@SRC is not allowed.");
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pp->file = strdup(arg);
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DIE_IF(pp->file == NULL);
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if (ptr)
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semantic_error("@SRC must be the last "
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"option.");
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break;
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case '%': /* Probe places */
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if (strcmp(arg, "return") == 0) {
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pp->retprobe = 1;
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} else /* Others not supported yet */
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semantic_error("%%%s is not supported.", arg);
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break;
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default:
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DIE_IF("Program has a bug.");
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break;
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}
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}
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/* Exclusion check */
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2009-10-27 21:43:19 +01:00
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if (pp->line && pp->offset)
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semantic_error("Offset can't be used with line number.");
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2009-10-27 21:43:10 +01:00
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if (!pp->line && pp->file && !pp->function)
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semantic_error("File always requires line number.");
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if (pp->offset && !pp->function)
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semantic_error("Offset requires an entry function.");
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if (pp->retprobe && !pp->function)
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semantic_error("Return probe requires an entry function.");
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2009-10-27 21:43:19 +01:00
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if ((pp->offset || pp->line) && pp->retprobe)
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semantic_error("Offset/Line can't be used with return probe.");
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2009-10-27 21:43:10 +01:00
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pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n",
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pp->function, pp->file, pp->line, pp->offset, pp->retprobe);
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}
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/* Parse an event definition. Note that any error must die. */
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static void parse_probe_event(const char *str)
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2009-10-08 23:17:38 +02:00
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{
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char *argv[MAX_PROBE_ARGS + 2]; /* Event + probe + args */
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int argc, i;
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struct probe_point *pp = &session.probes[session.nr_probe];
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2009-10-21 21:34:06 +02:00
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pr_debug("probe-definition(%d): %s\n", session.nr_probe, str);
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2009-10-08 23:17:38 +02:00
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if (++session.nr_probe == MAX_PROBES)
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semantic_error("Too many probes");
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/* Separate arguments, similar to argv_split */
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argc = 0;
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do {
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/* Skip separators */
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while (isspace(*str))
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str++;
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/* Add an argument */
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if (*str != '\0') {
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const char *s = str;
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/* Skip the argument */
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while (!isspace(*str) && *str != '\0')
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str++;
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/* Duplicate the argument */
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argv[argc] = strndup(s, str - s);
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if (argv[argc] == NULL)
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2009-10-17 02:08:01 +02:00
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die("strndup");
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2009-10-08 23:17:38 +02:00
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if (++argc == MAX_PROBE_ARGS)
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semantic_error("Too many arguments");
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2009-10-21 21:34:06 +02:00
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pr_debug("argv[%d]=%s\n", argc, argv[argc - 1]);
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2009-10-08 23:17:38 +02:00
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}
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} while (*str != '\0');
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2009-10-27 21:43:10 +01:00
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if (!argc)
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semantic_error("An empty argument.");
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2009-10-08 23:17:38 +02:00
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/* Parse probe point */
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2009-10-27 21:43:10 +01:00
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parse_probe_point(argv[0], pp);
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free(argv[0]);
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2009-10-08 00:28:30 +02:00
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if (pp->file)
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session.need_dwarf = 1;
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2009-10-08 23:17:38 +02:00
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/* Copy arguments */
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2009-10-27 21:43:10 +01:00
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pp->nr_args = argc - 1;
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2009-10-08 23:17:38 +02:00
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if (pp->nr_args > 0) {
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pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
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if (!pp->args)
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2009-10-17 02:08:01 +02:00
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die("malloc");
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2009-10-27 21:43:10 +01:00
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memcpy(pp->args, &argv[1], sizeof(char *) * pp->nr_args);
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2009-10-08 23:17:38 +02:00
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}
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/* Ensure return probe has no C argument */
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2009-10-08 00:28:30 +02:00
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for (i = 0; i < pp->nr_args; i++)
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if (is_c_varname(pp->args[i])) {
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2009-10-27 21:43:10 +01:00
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if (pp->retprobe)
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2009-10-08 23:17:38 +02:00
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semantic_error("You can't specify local"
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" variable for kretprobe");
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2009-10-08 00:28:30 +02:00
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session.need_dwarf = 1;
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}
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2009-10-21 21:34:06 +02:00
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pr_debug("%d arguments\n", pp->nr_args);
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2009-10-27 21:43:02 +01:00
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}
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2009-10-27 21:43:10 +01:00
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static int opt_add_probe_event(const struct option *opt __used,
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2009-10-27 21:43:02 +01:00
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const char *str, int unset __used)
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{
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if (str)
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2009-10-27 21:43:10 +01:00
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parse_probe_event(str);
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2009-10-08 23:17:38 +02:00
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return 0;
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}
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2009-10-08 00:28:30 +02:00
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#ifndef NO_LIBDWARF
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2009-10-08 23:17:38 +02:00
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static int open_default_vmlinux(void)
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{
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struct utsname uts;
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char fname[MAX_PATH_LEN];
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int fd, ret, i;
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ret = uname(&uts);
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if (ret) {
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2009-10-21 21:34:06 +02:00
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pr_debug("uname() failed.\n");
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2009-10-08 23:17:38 +02:00
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return -errno;
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}
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session.release = uts.release;
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for (i = 0; i < NR_SEARCH_PATH; i++) {
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ret = snprintf(fname, MAX_PATH_LEN,
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default_search_path[i], session.release);
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if (ret >= MAX_PATH_LEN || ret < 0) {
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2009-10-21 21:34:06 +02:00
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pr_debug("Filename(%d,%s) is too long.\n", i,
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2009-10-17 02:08:10 +02:00
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uts.release);
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2009-10-08 23:17:38 +02:00
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errno = E2BIG;
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return -E2BIG;
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}
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2009-10-21 21:34:06 +02:00
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pr_debug("try to open %s\n", fname);
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2009-10-08 23:17:38 +02:00
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fd = open(fname, O_RDONLY);
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if (fd >= 0)
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break;
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}
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return fd;
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}
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2009-10-08 00:28:30 +02:00
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#endif
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2009-10-08 23:17:38 +02:00
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static const char * const probe_usage[] = {
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2009-10-27 21:43:02 +01:00
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"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
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"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
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2009-10-08 23:17:38 +02:00
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NULL
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};
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static const struct option options[] = {
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2009-10-17 02:08:10 +02:00
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show parsed arguments, etc)"),
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2009-10-08 00:28:30 +02:00
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#ifndef NO_LIBDWARF
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2009-10-08 23:17:38 +02:00
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OPT_STRING('k', "vmlinux", &session.vmlinux, "file",
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"vmlinux/module pathname"),
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2009-10-08 00:28:30 +02:00
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#endif
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2009-10-27 21:43:02 +01:00
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OPT_CALLBACK('a', "add", NULL,
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2009-10-08 00:28:30 +02:00
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#ifdef NO_LIBDWARF
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2009-10-27 21:43:10 +01:00
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"FUNC[+OFFS|%return] [ARG ...]",
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2009-10-08 00:28:30 +02:00
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#else
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2009-10-27 21:43:19 +01:00
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"FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
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2009-10-08 00:28:30 +02:00
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#endif
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2009-10-08 23:17:38 +02:00
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"probe point definition, where\n"
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"\t\tGRP:\tGroup name (optional)\n"
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"\t\tNAME:\tEvent name\n"
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"\t\tFUNC:\tFunction name\n"
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"\t\tOFFS:\tOffset from function entry (in byte)\n"
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2009-10-27 21:43:10 +01:00
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"\t\t%return:\tPut the probe at function return\n"
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2009-10-08 00:28:30 +02:00
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#ifdef NO_LIBDWARF
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"\t\tARG:\tProbe argument (only \n"
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#else
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2009-10-08 23:17:38 +02:00
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"\t\tSRC:\tSource code path\n"
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2009-10-27 21:43:19 +01:00
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"\t\tRLN:\tRelative line number from function entry.\n"
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"\t\tALN:\tAbsolute line number in file.\n"
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2009-10-08 23:17:38 +02:00
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"\t\tARG:\tProbe argument (local variable name or\n"
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2009-10-08 00:28:30 +02:00
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#endif
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2009-10-08 23:17:38 +02:00
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"\t\t\tkprobe-tracer argument format is supported.)\n",
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2009-10-27 21:43:10 +01:00
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opt_add_probe_event),
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2009-10-08 23:17:38 +02:00
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OPT_END()
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};
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static int write_new_event(int fd, const char *buf)
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{
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int ret;
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ret = write(fd, buf, strlen(buf));
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if (ret <= 0)
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2009-11-04 01:12:21 +01:00
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die("Failed to create event.");
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else
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printf("Added new event: %s\n", buf);
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2009-10-08 23:17:38 +02:00
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return ret;
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}
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#define MAX_CMDLEN 256
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2009-10-27 21:43:10 +01:00
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static int synthesize_probe_event(struct probe_point *pp)
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2009-10-08 23:17:38 +02:00
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{
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char *buf;
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int i, len, ret;
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pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
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if (!buf)
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2009-11-04 01:12:21 +01:00
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die("Failed to allocate memory by calloc.");
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2009-10-08 23:17:38 +02:00
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|
|
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)
|
|
|
|
{
|
2009-10-08 00:28:30 +02:00
|
|
|
int i, j, fd, ret;
|
2009-10-08 23:17:38 +02:00
|
|
|
struct probe_point *pp;
|
|
|
|
char buf[MAX_CMDLEN];
|
|
|
|
|
|
|
|
argc = parse_options(argc, argv, options, probe_usage,
|
2009-10-27 21:43:02 +01:00
|
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
|
|
for (i = 0; i < argc; i++)
|
|
|
|
parse_probe_event(argv[i]);
|
|
|
|
|
|
|
|
if (session.nr_probe == 0)
|
2009-10-08 23:17:38 +02:00
|
|
|
usage_with_options(probe_usage, options);
|
|
|
|
|
2009-10-08 00:28:30 +02:00
|
|
|
#ifdef NO_LIBDWARF
|
|
|
|
if (session.need_dwarf)
|
|
|
|
semantic_error("Dwarf-analysis is not supported");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Synthesize probes without dwarf */
|
2009-10-08 23:17:38 +02:00
|
|
|
for (j = 0; j < session.nr_probe; j++) {
|
2009-10-08 00:28:30 +02:00
|
|
|
#ifndef NO_LIBDWARF
|
2009-10-27 21:43:10 +01:00
|
|
|
if (!session.probes[j].retprobe) {
|
2009-10-08 00:28:30 +02:00
|
|
|
session.need_dwarf = 1;
|
2009-10-08 23:17:38 +02:00
|
|
|
continue;
|
|
|
|
}
|
2009-10-08 00:28:30 +02:00
|
|
|
#endif
|
2009-10-27 21:43:10 +01:00
|
|
|
ret = synthesize_probe_event(&session.probes[j]);
|
2009-10-08 23:17:38 +02:00
|
|
|
if (ret == -E2BIG)
|
|
|
|
semantic_error("probe point is too long.");
|
2009-10-17 02:08:01 +02:00
|
|
|
else if (ret < 0)
|
2009-11-04 01:12:21 +01:00
|
|
|
die("Failed to synthesize a probe point.");
|
2009-10-08 23:17:38 +02:00
|
|
|
}
|
|
|
|
|
2009-10-08 00:28:30 +02:00
|
|
|
#ifndef NO_LIBDWARF
|
|
|
|
if (!session.need_dwarf)
|
2009-10-08 23:17:38 +02:00
|
|
|
goto setup_probes;
|
|
|
|
|
|
|
|
if (session.vmlinux)
|
|
|
|
fd = open(session.vmlinux, O_RDONLY);
|
|
|
|
else
|
|
|
|
fd = open_default_vmlinux();
|
2009-10-17 02:08:01 +02:00
|
|
|
if (fd < 0)
|
2009-11-04 01:12:21 +01:00
|
|
|
die("Could not open vmlinux/module file.");
|
2009-10-08 23:17:38 +02:00
|
|
|
|
|
|
|
/* 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);
|
2009-10-17 02:08:01 +02:00
|
|
|
if (ret <= 0)
|
|
|
|
die("No probe point found.\n");
|
2009-10-08 23:17:38 +02:00
|
|
|
}
|
|
|
|
close(fd);
|
|
|
|
|
|
|
|
setup_probes:
|
2009-10-08 00:28:30 +02:00
|
|
|
#endif /* !NO_LIBDWARF */
|
|
|
|
|
2009-10-08 23:17:38 +02:00
|
|
|
/* Settng up probe points */
|
|
|
|
snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
|
|
|
|
fd = open(buf, O_WRONLY, O_APPEND);
|
2009-11-04 01:12:21 +01:00
|
|
|
if (fd < 0) {
|
|
|
|
if (errno == ENOENT)
|
|
|
|
die("kprobe_events file does not exist - please rebuild with CONFIG_KPROBE_TRACER.");
|
|
|
|
else
|
|
|
|
die("Could not open kprobe_events file: %s",
|
|
|
|
strerror(errno));
|
|
|
|
}
|
2009-10-08 23:17:38 +02:00
|
|
|
for (j = 0; j < session.nr_probe; j++) {
|
|
|
|
pp = &session.probes[j];
|
|
|
|
if (pp->found == 1) {
|
2009-10-27 21:43:10 +01:00
|
|
|
snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x %s\n",
|
|
|
|
pp->retprobe ? 'r' : 'p', PERFPROBE_GROUP,
|
|
|
|
pp->function, pp->offset, pp->probes[0]);
|
2009-10-08 23:17:38 +02:00
|
|
|
write_new_event(fd, buf);
|
|
|
|
} else
|
|
|
|
for (i = 0; i < pp->found; i++) {
|
2009-10-27 21:43:10 +01:00
|
|
|
snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x_%d %s\n",
|
|
|
|
pp->retprobe ? 'r' : 'p',
|
|
|
|
PERFPROBE_GROUP,
|
|
|
|
pp->function, pp->offset, i,
|
|
|
|
pp->probes[0]);
|
2009-10-08 23:17:38 +02:00
|
|
|
write_new_event(fd, buf);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
close(fd);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|