408 lines
11 KiB
C
408 lines
11 KiB
C
/*
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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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#include "util/strlist.h"
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#include "util/strfilter.h"
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#include "util/symbol.h"
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#include "util/debug.h"
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#include "util/debugfs.h"
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#include "util/parse-options.h"
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#include "util/probe-finder.h"
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#include "util/probe-event.h"
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#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
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#define DEFAULT_FUNC_FILTER "!_*"
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#define MAX_PATH_LEN 256
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/* Session management structure */
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static struct {
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bool list_events;
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bool force_add;
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bool show_lines;
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bool show_vars;
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bool show_ext_vars;
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bool show_funcs;
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bool mod_events;
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int nevents;
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struct perf_probe_event events[MAX_PROBES];
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struct strlist *dellist;
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struct line_range line_range;
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const char *target_module;
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int max_probe_points;
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struct strfilter *filter;
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} params;
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/* Parse an event definition. Note that any error must die. */
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static int parse_probe_event(const char *str)
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{
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struct perf_probe_event *pev = ¶ms.events[params.nevents];
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int ret;
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pr_debug("probe-definition(%d): %s\n", params.nevents, str);
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if (++params.nevents == MAX_PROBES) {
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pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
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return -1;
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}
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/* Parse a perf-probe command into event */
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ret = parse_perf_probe_command(str, pev);
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pr_debug("%d arguments\n", pev->nargs);
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return ret;
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}
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static int parse_probe_event_argv(int argc, const char **argv)
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{
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int i, len, ret;
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char *buf;
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/* Bind up rest arguments */
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len = 0;
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for (i = 0; i < argc; i++)
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len += strlen(argv[i]) + 1;
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buf = zalloc(len + 1);
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if (buf == NULL)
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return -ENOMEM;
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len = 0;
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for (i = 0; i < argc; i++)
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len += sprintf(&buf[len], "%s ", argv[i]);
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params.mod_events = true;
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ret = parse_probe_event(buf);
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free(buf);
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return ret;
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}
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static int opt_add_probe_event(const struct option *opt __used,
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const char *str, int unset __used)
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{
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if (str) {
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params.mod_events = true;
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return parse_probe_event(str);
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} else
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return 0;
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}
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static int opt_del_probe_event(const struct option *opt __used,
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const char *str, int unset __used)
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{
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if (str) {
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params.mod_events = true;
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if (!params.dellist)
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params.dellist = strlist__new(true, NULL);
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strlist__add(params.dellist, str);
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}
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return 0;
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}
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#ifdef DWARF_SUPPORT
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static int opt_show_lines(const struct option *opt __used,
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const char *str, int unset __used)
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{
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int ret = 0;
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if (!str)
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return 0;
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if (params.show_lines) {
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pr_warning("Warning: more than one --line options are"
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" detected. Only the first one is valid.\n");
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return 0;
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}
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params.show_lines = true;
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ret = parse_line_range_desc(str, ¶ms.line_range);
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INIT_LIST_HEAD(¶ms.line_range.line_list);
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return ret;
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}
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static int opt_show_vars(const struct option *opt __used,
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const char *str, int unset __used)
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{
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struct perf_probe_event *pev = ¶ms.events[params.nevents];
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int ret;
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if (!str)
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return 0;
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ret = parse_probe_event(str);
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if (!ret && pev->nargs != 0) {
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pr_err(" Error: '--vars' doesn't accept arguments.\n");
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return -EINVAL;
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}
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params.show_vars = true;
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return ret;
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}
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#endif
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static int opt_set_filter(const struct option *opt __used,
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const char *str, int unset __used)
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{
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const char *err;
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if (str) {
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pr_debug2("Set filter: %s\n", str);
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if (params.filter)
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strfilter__delete(params.filter);
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params.filter = strfilter__new(str, &err);
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if (!params.filter) {
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pr_err("Filter parse error at %td.\n", err - str + 1);
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pr_err("Source: \"%s\"\n", str);
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pr_err(" %*c\n", (int)(err - str + 1), '^');
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return -EINVAL;
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}
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}
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return 0;
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}
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static const char * const probe_usage[] = {
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"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
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"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
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"perf probe [<options>] --del '[GROUP:]EVENT' ...",
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"perf probe --list",
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#ifdef DWARF_SUPPORT
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"perf probe [<options>] --line 'LINEDESC'",
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"perf probe [<options>] --vars 'PROBEPOINT'",
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#endif
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NULL
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};
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static const struct option options[] = {
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose (show parsed arguments, etc)"),
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OPT_BOOLEAN('l', "list", ¶ms.list_events,
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"list up current probe events"),
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OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
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opt_del_probe_event),
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OPT_CALLBACK('a', "add", NULL,
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#ifdef DWARF_SUPPORT
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"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
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" [[NAME=]ARG ...]",
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#else
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"[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
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#endif
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"probe point definition, where\n"
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"\t\tGROUP:\tGroup name (optional)\n"
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"\t\tEVENT:\tEvent name\n"
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"\t\tFUNC:\tFunction name\n"
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"\t\tOFF:\tOffset from function entry (in byte)\n"
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"\t\t%return:\tPut the probe at function return\n"
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#ifdef DWARF_SUPPORT
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"\t\tSRC:\tSource code path\n"
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"\t\tRL:\tRelative line number from function entry.\n"
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"\t\tAL:\tAbsolute line number in file.\n"
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"\t\tPT:\tLazy expression of line code.\n"
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"\t\tARG:\tProbe argument (local variable name or\n"
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"\t\t\tkprobe-tracer argument format.)\n",
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#else
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"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
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#endif
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opt_add_probe_event),
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OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events"
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" with existing name"),
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#ifdef DWARF_SUPPORT
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OPT_CALLBACK('L', "line", NULL,
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"FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
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"Show source code lines.", opt_show_lines),
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OPT_CALLBACK('V', "vars", NULL,
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"FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
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"Show accessible variables on PROBEDEF", opt_show_vars),
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OPT_BOOLEAN('\0', "externs", ¶ms.show_ext_vars,
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"Show external variables too (with --vars only)"),
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OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
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"file", "vmlinux pathname"),
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OPT_STRING('s', "source", &symbol_conf.source_prefix,
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"directory", "path to kernel source"),
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OPT_STRING('m', "module", ¶ms.target_module,
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"modname|path",
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"target module name (for online) or path (for offline)"),
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#endif
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OPT__DRY_RUN(&probe_event_dry_run),
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OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
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"Set how many probe points can be found for a probe."),
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OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs,
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"Show potential probe-able functions."),
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OPT_CALLBACK('\0', "filter", NULL,
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"[!]FILTER", "Set a filter (with --vars/funcs only)\n"
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"\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
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"\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
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opt_set_filter),
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OPT_END()
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};
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int cmd_probe(int argc, const char **argv, const char *prefix __used)
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{
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int ret;
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argc = parse_options(argc, argv, options, probe_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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if (argc > 0) {
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if (strcmp(argv[0], "-") == 0) {
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pr_warning(" Error: '-' is not supported.\n");
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usage_with_options(probe_usage, options);
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}
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ret = parse_probe_event_argv(argc, argv);
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if (ret < 0) {
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pr_err(" Error: Parse Error. (%d)\n", ret);
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return ret;
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}
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}
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if (params.max_probe_points == 0)
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params.max_probe_points = MAX_PROBES;
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if ((!params.nevents && !params.dellist && !params.list_events &&
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!params.show_lines && !params.show_funcs))
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usage_with_options(probe_usage, options);
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/*
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* Only consider the user's kernel image path if given.
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*/
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symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
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if (params.list_events) {
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if (params.mod_events) {
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pr_err(" Error: Don't use --list with --add/--del.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_lines) {
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pr_err(" Error: Don't use --list with --line.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_vars) {
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pr_err(" Error: Don't use --list with --vars.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_funcs) {
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pr_err(" Error: Don't use --list with --funcs.\n");
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usage_with_options(probe_usage, options);
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}
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ret = show_perf_probe_events();
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if (ret < 0)
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pr_err(" Error: Failed to show event list. (%d)\n",
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ret);
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return ret;
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}
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if (params.show_funcs) {
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if (params.nevents != 0 || params.dellist) {
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pr_err(" Error: Don't use --funcs with"
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" --add/--del.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_lines) {
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pr_err(" Error: Don't use --funcs with --line.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_vars) {
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pr_err(" Error: Don't use --funcs with --vars.\n");
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usage_with_options(probe_usage, options);
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}
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if (!params.filter)
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params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
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NULL);
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ret = show_available_funcs(params.target_module,
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params.filter);
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strfilter__delete(params.filter);
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if (ret < 0)
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pr_err(" Error: Failed to show functions."
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" (%d)\n", ret);
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return ret;
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}
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#ifdef DWARF_SUPPORT
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if (params.show_lines) {
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if (params.mod_events) {
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pr_err(" Error: Don't use --line with"
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" --add/--del.\n");
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usage_with_options(probe_usage, options);
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}
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if (params.show_vars) {
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pr_err(" Error: Don't use --line with --vars.\n");
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usage_with_options(probe_usage, options);
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}
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ret = show_line_range(¶ms.line_range, params.target_module);
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if (ret < 0)
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pr_err(" Error: Failed to show lines. (%d)\n", ret);
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return ret;
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}
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if (params.show_vars) {
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if (params.mod_events) {
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pr_err(" Error: Don't use --vars with"
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" --add/--del.\n");
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usage_with_options(probe_usage, options);
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}
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if (!params.filter)
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params.filter = strfilter__new(DEFAULT_VAR_FILTER,
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NULL);
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ret = show_available_vars(params.events, params.nevents,
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params.max_probe_points,
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params.target_module,
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params.filter,
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params.show_ext_vars);
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strfilter__delete(params.filter);
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if (ret < 0)
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pr_err(" Error: Failed to show vars. (%d)\n", ret);
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return ret;
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}
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#endif
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if (params.dellist) {
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ret = del_perf_probe_events(params.dellist);
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strlist__delete(params.dellist);
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if (ret < 0) {
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pr_err(" Error: Failed to delete events. (%d)\n", ret);
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return ret;
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}
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}
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if (params.nevents) {
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ret = add_perf_probe_events(params.events, params.nevents,
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params.max_probe_points,
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params.target_module,
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params.force_add);
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if (ret < 0) {
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pr_err(" Error: Failed to add events. (%d)\n", ret);
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return ret;
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}
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}
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return 0;
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}
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