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|
/*
* 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.
*
*/
#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>
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
#include "util/strlist.h"
#include "util/strfilter.h"
#include "util/symbol.h"
#include "util/debug.h"
#include <lk/debugfs.h>
#include "util/parse-options.h"
#include "util/probe-finder.h"
#include "util/probe-event.h"
#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
#define DEFAULT_FUNC_FILTER "!_*"
/* Session management structure */
static struct {
bool list_events;
bool force_add;
bool show_lines;
bool show_vars;
bool show_ext_vars;
bool show_funcs;
bool mod_events;
bool uprobes;
int nevents;
struct perf_probe_event events[MAX_PROBES];
struct strlist *dellist;
struct line_range line_range;
const char *target;
int max_probe_points;
struct strfilter *filter;
} params;
/* Parse an event definition. Note that any error must die. */
static int parse_probe_event(const char *str)
{
struct perf_probe_event *pev = ¶ms.events[params.nevents];
int ret;
pr_debug("probe-definition(%d): %s\n", params.nevents, str);
if (++params.nevents == MAX_PROBES) {
pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
return -1;
}
pev->uprobes = params.uprobes;
/* Parse a perf-probe command into event */
ret = parse_perf_probe_command(str, pev);
pr_debug("%d arguments\n", pev->nargs);
return ret;
}
static int set_target(const char *ptr)
{
int found = 0;
const char *buf;
/*
* The first argument after options can be an absolute path
* to an executable / library or kernel module.
*
* TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
* short module name.
*/
if (!params.target && ptr && *ptr == '/') {
params.target = ptr;
found = 1;
buf = ptr + (strlen(ptr) - 3);
if (strcmp(buf, ".ko"))
params.uprobes = true;
}
return found;
}
static int parse_probe_event_argv(int argc, const char **argv)
{
int i, len, ret, found_target;
char *buf;
found_target = set_target(argv[0]);
if (found_target && argc == 1)
return 0;
/* Bind up rest arguments */
len = 0;
for (i = 0; i < argc; i++) {
if (i == 0 && found_target)
continue;
len += strlen(argv[i]) + 1;
}
buf = zalloc(len + 1);
if (buf == NULL)
return -ENOMEM;
len = 0;
for (i = 0; i < argc; i++) {
if (i == 0 && found_target)
continue;
len += sprintf(&buf[len], "%s ", argv[i]);
}
params.mod_events = true;
ret = parse_probe_event(buf);
free(buf);
return ret;
}
static int opt_add_probe_event(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
if (str) {
params.mod_events = true;
return parse_probe_event(str);
} else
return 0;
}
static int opt_del_probe_event(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
if (str) {
params.mod_events = true;
if (!params.dellist)
params.dellist = strlist__new(true, NULL);
strlist__add(params.dellist, str);
}
return 0;
}
static int opt_set_target(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int ret = -ENOENT;
if (str && !params.target) {
if (!strcmp(opt->long_name, "exec"))
params.uprobes = true;
#ifdef HAVE_DWARF_SUPPORT
else if (!strcmp(opt->long_name, "module"))
params.uprobes = false;
#endif
else
return ret;
params.target = str;
ret = 0;
}
return ret;
}
#ifdef HAVE_DWARF_SUPPORT
static int opt_show_lines(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
int ret = 0;
if (!str)
return 0;
if (params.show_lines) {
pr_warning("Warning: more than one --line options are"
" detected. Only the first one is valid.\n");
return 0;
}
params.show_lines = true;
ret = parse_line_range_desc(str, ¶ms.line_range);
INIT_LIST_HEAD(¶ms.line_range.line_list);
return ret;
}
static int opt_show_vars(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
struct perf_probe_event *pev = ¶ms.events[params.nevents];
int ret;
if (!str)
return 0;
ret = parse_probe_event(str);
if (!ret && pev->nargs != 0) {
pr_err(" Error: '--vars' doesn't accept arguments.\n");
return -EINVAL;
}
params.show_vars = true;
return ret;
}
#endif
static int opt_set_filter(const struct option *opt __maybe_unused,
const char *str, int unset __maybe_unused)
{
const char *err;
if (str) {
pr_debug2("Set filter: %s\n", str);
if (params.filter)
strfilter__delete(params.filter);
params.filter = strfilter__new(str, &err);
if (!params.filter) {
pr_err("Filter parse error at %td.\n", err - str + 1);
pr_err("Source: \"%s\"\n", str);
pr_err(" %*c\n", (int)(err - str + 1), '^');
return -EINVAL;
}
}
return 0;
}
int cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
{
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",
#ifdef HAVE_DWARF_SUPPORT
"perf probe [<options>] --line 'LINEDESC'",
"perf probe [<options>] --vars 'PROBEPOINT'",
#endif
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