mirror of https://gitee.com/openkylin/linux.git
536 lines
14 KiB
C
536 lines
14 KiB
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.
|
|
*
|
|
*/
|
|
#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 <api/fs/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;
|
|
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 = strdup(ptr);
|
|
if (!params.target)
|
|
return -ENOMEM;
|
|
|
|
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 < 0)
|
|
return found_target;
|
|
|
|
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;
|
|
char *tmp;
|
|
|
|
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;
|
|
|
|
/* Expand given path to absolute path, except for modulename */
|
|
if (params.uprobes || strchr(str, '/')) {
|
|
tmp = realpath(str, NULL);
|
|
if (!tmp) {
|
|
pr_warning("Failed to get the absolute path of %s: %m\n", str);
|
|
return ret;
|
|
}
|
|
} else {
|
|
tmp = strdup(str);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
}
|
|
params.target = tmp;
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|
|
static int init_params(void)
|
|
{
|
|
return line_range__init(¶ms.line_range);
|
|
}
|
|
|
|
static void cleanup_params(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < params.nevents; i++)
|
|
clear_perf_probe_event(params.events + i);
|
|
if (params.dellist)
|
|
strlist__delete(params.dellist);
|
|
line_range__clear(¶ms.line_range);
|
|
free(params.target);
|
|
if (params.filter)
|
|
strfilter__delete(params.filter);
|
|
memset(¶ms, 0, sizeof(params));
|
|
}
|
|
|
|
static void pr_err_with_code(const char *msg, int err)
|
|
{
|
|
char sbuf[STRERR_BUFSIZE];
|
|
|
|
pr_err("%s", msg);
|
|
pr_debug(" Reason: %s (Code: %d)",
|
|
strerror_r(-err, sbuf, sizeof(sbuf)), err);
|
|
pr_err("\n");
|
|
}
|
|
|
|
static 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
|
|
NULL
|
|
};
|
|
const struct option options[] = {
|
|
OPT_INCR('v', "verbose", &verbose,
|
|
"be more verbose (show parsed arguments, etc)"),
|
|
OPT_BOOLEAN('l', "list", ¶ms.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 HAVE_DWARF_SUPPORT
|
|
"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
|
|
" [[NAME=]ARG ...]",
|
|
#else
|
|
"[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
|
|
#endif
|
|
"probe point definition, where\n"
|
|
"\t\tGROUP:\tGroup name (optional)\n"
|
|
"\t\tEVENT:\tEvent name\n"
|
|
"\t\tFUNC:\tFunction name\n"
|
|
"\t\tOFF:\tOffset from function entry (in byte)\n"
|
|
"\t\t%return:\tPut the probe at function return\n"
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
"\t\tSRC:\tSource code path\n"
|
|
"\t\tRL:\tRelative line number from function entry.\n"
|
|
"\t\tAL:\tAbsolute line number in file.\n"
|
|
"\t\tPT:\tLazy expression of line code.\n"
|
|
"\t\tARG:\tProbe argument (local variable name or\n"
|
|
"\t\t\tkprobe-tracer argument format.)\n",
|
|
#else
|
|
"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
|
|
#endif
|
|
opt_add_probe_event),
|
|
OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events"
|
|
" with existing name"),
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
OPT_CALLBACK('L', "line", NULL,
|
|
"FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
|
|
"Show source code lines.", opt_show_lines),
|
|
OPT_CALLBACK('V', "vars", NULL,
|
|
"FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
|
|
"Show accessible variables on PROBEDEF", opt_show_vars),
|
|
OPT_BOOLEAN('\0', "externs", ¶ms.show_ext_vars,
|
|
"Show external variables too (with --vars only)"),
|
|
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
|
|
"file", "vmlinux pathname"),
|
|
OPT_STRING('s', "source", &symbol_conf.source_prefix,
|
|
"directory", "path to kernel source"),
|
|
OPT_CALLBACK('m', "module", NULL, "modname|path",
|
|
"target module name (for online) or path (for offline)",
|
|
opt_set_target),
|
|
#endif
|
|
OPT__DRY_RUN(&probe_event_dry_run),
|
|
OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
|
|
"Set how many probe points can be found for a probe."),
|
|
OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs,
|
|
"Show potential probe-able functions."),
|
|
OPT_CALLBACK('\0', "filter", NULL,
|
|
"[!]FILTER", "Set a filter (with --vars/funcs only)\n"
|
|
"\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
|
|
"\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
|
|
opt_set_filter),
|
|
OPT_CALLBACK('x', "exec", NULL, "executable|path",
|
|
"target executable name or path", opt_set_target),
|
|
OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
|
|
"Disable symbol demangling"),
|
|
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
|
|
"Enable kernel symbol demangling"),
|
|
OPT_END()
|
|
};
|
|
int ret;
|
|
|
|
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);
|
|
}
|
|
ret = parse_probe_event_argv(argc, argv);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Command Parse Error.", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (params.max_probe_points == 0)
|
|
params.max_probe_points = MAX_PROBES;
|
|
|
|
if ((!params.nevents && !params.dellist && !params.list_events &&
|
|
!params.show_lines && !params.show_funcs))
|
|
usage_with_options(probe_usage, options);
|
|
|
|
/*
|
|
* Only consider the user's kernel image path if given.
|
|
*/
|
|
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
|
|
|
|
if (params.list_events) {
|
|
if (params.mod_events) {
|
|
pr_err(" Error: Don't use --list with --add/--del.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.show_lines) {
|
|
pr_err(" Error: Don't use --list with --line.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.show_vars) {
|
|
pr_err(" Error: Don't use --list with --vars.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.show_funcs) {
|
|
pr_err(" Error: Don't use --list with --funcs.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.uprobes) {
|
|
pr_warning(" Error: Don't use --list with --exec.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
ret = show_perf_probe_events();
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show event list.", ret);
|
|
return ret;
|
|
}
|
|
if (params.show_funcs) {
|
|
if (params.nevents != 0 || params.dellist) {
|
|
pr_err(" Error: Don't use --funcs with"
|
|
" --add/--del.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.show_lines) {
|
|
pr_err(" Error: Don't use --funcs with --line.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.show_vars) {
|
|
pr_err(" Error: Don't use --funcs with --vars.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (!params.filter)
|
|
params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
|
|
NULL);
|
|
ret = show_available_funcs(params.target, params.filter,
|
|
params.uprobes);
|
|
strfilter__delete(params.filter);
|
|
params.filter = NULL;
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show functions.", ret);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
if (params.show_lines) {
|
|
if (params.mod_events) {
|
|
pr_err(" Error: Don't use --line with"
|
|
" --add/--del.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.show_vars) {
|
|
pr_err(" Error: Don't use --line with --vars.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
|
|
ret = show_line_range(¶ms.line_range, params.target);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show lines.", ret);
|
|
return ret;
|
|
}
|
|
if (params.show_vars) {
|
|
if (params.mod_events) {
|
|
pr_err(" Error: Don't use --vars with"
|
|
" --add/--del.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (!params.filter)
|
|
params.filter = strfilter__new(DEFAULT_VAR_FILTER,
|
|
NULL);
|
|
|
|
ret = show_available_vars(params.events, params.nevents,
|
|
params.max_probe_points,
|
|
params.target,
|
|
params.filter,
|
|
params.show_ext_vars);
|
|
strfilter__delete(params.filter);
|
|
params.filter = NULL;
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show vars.", ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
if (params.dellist) {
|
|
ret = del_perf_probe_events(params.dellist);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Failed to delete events.", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (params.nevents) {
|
|
ret = add_perf_probe_events(params.events, params.nevents,
|
|
params.max_probe_points,
|
|
params.target,
|
|
params.force_add);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Failed to add events.", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cmd_probe(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_params();
|
|
if (!ret) {
|
|
ret = __cmd_probe(argc, argv, prefix);
|
|
cleanup_params();
|
|
}
|
|
|
|
return ret;
|
|
}
|