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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" | |
fa28244d | 38 | #include "util/strlist.h" |
89c69c0e MH |
39 | #include "util/event.h" |
40 | #include "util/debug.h" | |
96c96612 | 41 | #include "util/debugfs.h" |
a128168d MH |
42 | #include "util/symbol.h" |
43 | #include "util/thread.h" | |
4ea42b18 MH |
44 | #include "util/parse-options.h" |
45 | #include "util/parse-events.h" /* For debugfs_path */ | |
46 | #include "util/probe-finder.h" | |
50656eec | 47 | #include "util/probe-event.h" |
4ea42b18 | 48 | |
4ea42b18 | 49 | #define MAX_PATH_LEN 256 |
4ea42b18 MH |
50 | |
51 | /* Session management structure */ | |
52 | static struct { | |
fac13fd5 MH |
53 | bool need_dwarf; |
54 | bool list_events; | |
d761b08b | 55 | bool force_add; |
631c9def | 56 | bool show_lines; |
4ea42b18 MH |
57 | int nr_probe; |
58 | struct probe_point probes[MAX_PROBES]; | |
fa28244d | 59 | struct strlist *dellist; |
8ad94c60 ACM |
60 | struct map_groups kmap_groups; |
61 | struct map *kmaps[MAP__NR_TYPES]; | |
631c9def | 62 | struct line_range line_range; |
4ea42b18 MH |
63 | } session; |
64 | ||
4de189fe | 65 | |
253977b0 MH |
66 | /* Parse an event definition. Note that any error must die. */ |
67 | static void parse_probe_event(const char *str) | |
4ea42b18 | 68 | { |
4ea42b18 | 69 | struct probe_point *pp = &session.probes[session.nr_probe]; |
4ea42b18 | 70 | |
b7cb10e7 | 71 | pr_debug("probe-definition(%d): %s\n", session.nr_probe, str); |
4ea42b18 | 72 | if (++session.nr_probe == MAX_PROBES) |
50656eec | 73 | die("Too many probes (> %d) are specified.", MAX_PROBES); |
4ea42b18 | 74 | |
50656eec | 75 | /* Parse perf-probe event into probe_point */ |
fac13fd5 | 76 | parse_perf_probe_event(str, pp, &session.need_dwarf); |
23e8ec0d | 77 | |
b7cb10e7 | 78 | pr_debug("%d arguments\n", pp->nr_args); |
46ab4926 MH |
79 | } |
80 | ||
d1bde3f7 MH |
81 | static void parse_probe_event_argv(int argc, const char **argv) |
82 | { | |
83 | int i, len; | |
84 | char *buf; | |
85 | ||
86 | /* Bind up rest arguments */ | |
87 | len = 0; | |
88 | for (i = 0; i < argc; i++) | |
89 | len += strlen(argv[i]) + 1; | |
31facc5f | 90 | buf = xzalloc(len + 1); |
d1bde3f7 MH |
91 | len = 0; |
92 | for (i = 0; i < argc; i++) | |
93 | len += sprintf(&buf[len], "%s ", argv[i]); | |
94 | parse_probe_event(buf); | |
95 | free(buf); | |
96 | } | |
97 | ||
253977b0 | 98 | static int opt_add_probe_event(const struct option *opt __used, |
46ab4926 MH |
99 | const char *str, int unset __used) |
100 | { | |
101 | if (str) | |
253977b0 | 102 | parse_probe_event(str); |
4ea42b18 MH |
103 | return 0; |
104 | } | |
105 | ||
fa28244d MH |
106 | static int opt_del_probe_event(const struct option *opt __used, |
107 | const char *str, int unset __used) | |
108 | { | |
109 | if (str) { | |
110 | if (!session.dellist) | |
111 | session.dellist = strlist__new(true, NULL); | |
112 | strlist__add(session.dellist, str); | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
62bdc1b3 MH |
117 | /* Currently just checking function name from symbol map */ |
118 | static void evaluate_probe_point(struct probe_point *pp) | |
119 | { | |
120 | struct symbol *sym; | |
8ad94c60 ACM |
121 | sym = map__find_symbol_by_name(session.kmaps[MAP__FUNCTION], |
122 | pp->function, NULL); | |
62bdc1b3 MH |
123 | if (!sym) |
124 | die("Kernel symbol \'%s\' not found - probe not added.", | |
125 | pp->function); | |
126 | } | |
127 | ||
804b3606 | 128 | #ifndef NO_DWARF_SUPPORT |
a128168d | 129 | static int open_vmlinux(void) |
4ea42b18 | 130 | { |
8ad94c60 | 131 | if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) { |
a128168d MH |
132 | pr_debug("Failed to load kernel map.\n"); |
133 | return -EINVAL; | |
4ea42b18 | 134 | } |
8ad94c60 ACM |
135 | pr_debug("Try to open %s\n", |
136 | session.kmaps[MAP__FUNCTION]->dso->long_name); | |
137 | return open(session.kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY); | |
4ea42b18 | 138 | } |
0eda7385 HM |
139 | |
140 | static int opt_show_lines(const struct option *opt __used, | |
141 | const char *str, int unset __used) | |
142 | { | |
143 | if (str) | |
144 | parse_line_range_desc(str, &session.line_range); | |
145 | INIT_LIST_HEAD(&session.line_range.line_list); | |
146 | session.show_lines = true; | |
147 | return 0; | |
148 | } | |
23e8ec0d | 149 | #endif |
4ea42b18 MH |
150 | |
151 | static const char * const probe_usage[] = { | |
46ab4926 MH |
152 | "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]", |
153 | "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]", | |
fa28244d | 154 | "perf probe [<options>] --del '[GROUP:]EVENT' ...", |
4de189fe | 155 | "perf probe --list", |
804b3606 | 156 | #ifndef NO_DWARF_SUPPORT |
631c9def | 157 | "perf probe --line 'LINEDESC'", |
f3ab481c | 158 | #endif |
4ea42b18 MH |
159 | NULL |
160 | }; | |
161 | ||
162 | static const struct option options[] = { | |
89c69c0e MH |
163 | OPT_BOOLEAN('v', "verbose", &verbose, |
164 | "be more verbose (show parsed arguments, etc)"), | |
804b3606 | 165 | #ifndef NO_DWARF_SUPPORT |
75be6cf4 | 166 | OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, |
a128168d | 167 | "file", "vmlinux pathname"), |
23e8ec0d | 168 | #endif |
fac13fd5 MH |
169 | OPT_BOOLEAN('l', "list", &session.list_events, |
170 | "list up current probe events"), | |
fa28244d MH |
171 | OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.", |
172 | opt_del_probe_event), | |
46ab4926 | 173 | OPT_CALLBACK('a', "add", NULL, |
804b3606 | 174 | #ifdef NO_DWARF_SUPPORT |
2a9c8c36 | 175 | "[EVENT=]FUNC[+OFF|%return] [ARG ...]", |
23e8ec0d | 176 | #else |
32cb0dd5 | 177 | "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT" |
2a9c8c36 | 178 | " [ARG ...]", |
23e8ec0d | 179 | #endif |
4ea42b18 | 180 | "probe point definition, where\n" |
af663d75 MH |
181 | "\t\tGROUP:\tGroup name (optional)\n" |
182 | "\t\tEVENT:\tEvent name\n" | |
4ea42b18 | 183 | "\t\tFUNC:\tFunction name\n" |
2a9c8c36 | 184 | "\t\tOFF:\tOffset from function entry (in byte)\n" |
253977b0 | 185 | "\t\t%return:\tPut the probe at function return\n" |
804b3606 | 186 | #ifdef NO_DWARF_SUPPORT |
23e8ec0d MH |
187 | "\t\tARG:\tProbe argument (only \n" |
188 | #else | |
4ea42b18 | 189 | "\t\tSRC:\tSource code path\n" |
2a9c8c36 MH |
190 | "\t\tRL:\tRelative line number from function entry.\n" |
191 | "\t\tAL:\tAbsolute line number in file.\n" | |
192 | "\t\tPT:\tLazy expression of line code.\n" | |
4ea42b18 | 193 | "\t\tARG:\tProbe argument (local variable name or\n" |
23e8ec0d | 194 | #endif |
50656eec | 195 | "\t\t\tkprobe-tracer argument format.)\n", |
253977b0 | 196 | opt_add_probe_event), |
d761b08b MH |
197 | OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events" |
198 | " with existing name"), | |
804b3606 | 199 | #ifndef NO_DWARF_SUPPORT |
631c9def MH |
200 | OPT_CALLBACK('L', "line", NULL, |
201 | "FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]", | |
202 | "Show source code lines.", opt_show_lines), | |
203 | #endif | |
4ea42b18 MH |
204 | OPT_END() |
205 | }; | |
206 | ||
631c9def MH |
207 | /* Initialize symbol maps for vmlinux */ |
208 | static void init_vmlinux(void) | |
209 | { | |
210 | symbol_conf.sort_by_name = true; | |
211 | if (symbol_conf.vmlinux_name == NULL) | |
212 | symbol_conf.try_vmlinux_path = true; | |
213 | else | |
214 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
215 | if (symbol__init() < 0) | |
216 | die("Failed to init symbol map."); | |
8ad94c60 ACM |
217 | |
218 | map_groups__init(&session.kmap_groups); | |
219 | if (map_groups__create_kernel_maps(&session.kmap_groups, | |
220 | session.kmaps) < 0) | |
221 | die("Failed to create kernel maps."); | |
631c9def MH |
222 | } |
223 | ||
4ea42b18 MH |
224 | int cmd_probe(int argc, const char **argv, const char *prefix __used) |
225 | { | |
d1bde3f7 | 226 | int i, ret; |
804b3606 | 227 | #ifndef NO_DWARF_SUPPORT |
bdad0db7 XG |
228 | int fd; |
229 | #endif | |
4ea42b18 | 230 | struct probe_point *pp; |
4ea42b18 MH |
231 | |
232 | argc = parse_options(argc, argv, options, probe_usage, | |
46ab4926 | 233 | PARSE_OPT_STOP_AT_NON_OPTION); |
ce11a603 MH |
234 | if (argc > 0) { |
235 | if (strcmp(argv[0], "-") == 0) { | |
236 | pr_warning(" Error: '-' is not supported.\n"); | |
237 | usage_with_options(probe_usage, options); | |
238 | } | |
d1bde3f7 | 239 | parse_probe_event_argv(argc, argv); |
ce11a603 | 240 | } |
46ab4926 | 241 | |
631c9def MH |
242 | if ((!session.nr_probe && !session.dellist && !session.list_events && |
243 | !session.show_lines)) | |
4ea42b18 MH |
244 | usage_with_options(probe_usage, options); |
245 | ||
96c96612 MH |
246 | if (debugfs_valid_mountpoint(debugfs_path) < 0) |
247 | die("Failed to find debugfs path."); | |
248 | ||
fac13fd5 | 249 | if (session.list_events) { |
fa28244d MH |
250 | if (session.nr_probe != 0 || session.dellist) { |
251 | pr_warning(" Error: Don't use --list with" | |
252 | " --add/--del.\n"); | |
253 | usage_with_options(probe_usage, options); | |
254 | } | |
631c9def MH |
255 | if (session.show_lines) { |
256 | pr_warning(" Error: Don't use --list with --line.\n"); | |
257 | usage_with_options(probe_usage, options); | |
258 | } | |
4de189fe MH |
259 | show_perf_probe_events(); |
260 | return 0; | |
261 | } | |
262 | ||
804b3606 | 263 | #ifndef NO_DWARF_SUPPORT |
631c9def MH |
264 | if (session.show_lines) { |
265 | if (session.nr_probe != 0 || session.dellist) { | |
266 | pr_warning(" Error: Don't use --line with" | |
267 | " --add/--del.\n"); | |
268 | usage_with_options(probe_usage, options); | |
269 | } | |
270 | init_vmlinux(); | |
271 | fd = open_vmlinux(); | |
272 | if (fd < 0) | |
273 | die("Could not open debuginfo file."); | |
274 | ret = find_line_range(fd, &session.line_range); | |
275 | if (ret <= 0) | |
276 | die("Source line is not found.\n"); | |
277 | close(fd); | |
278 | show_line_range(&session.line_range); | |
279 | return 0; | |
280 | } | |
281 | #endif | |
282 | ||
fa28244d MH |
283 | if (session.dellist) { |
284 | del_trace_kprobe_events(session.dellist); | |
285 | strlist__delete(session.dellist); | |
286 | if (session.nr_probe == 0) | |
287 | return 0; | |
288 | } | |
289 | ||
631c9def MH |
290 | /* Add probes */ |
291 | init_vmlinux(); | |
a128168d | 292 | |
23e8ec0d | 293 | if (session.need_dwarf) |
804b3606 | 294 | #ifdef NO_DWARF_SUPPORT |
50656eec | 295 | die("Debuginfo-analysis is not supported"); |
804b3606 | 296 | #else /* !NO_DWARF_SUPPORT */ |
f41b1e43 | 297 | pr_debug("Some probes require debuginfo.\n"); |
4ea42b18 | 298 | |
a128168d | 299 | fd = open_vmlinux(); |
a225a1d9 MH |
300 | if (fd < 0) { |
301 | if (session.need_dwarf) | |
f984f03d | 302 | die("Could not open debuginfo file."); |
a225a1d9 | 303 | |
d3a2dbf8 MH |
304 | pr_debug("Could not open vmlinux/module file." |
305 | " Try to use symbols.\n"); | |
a225a1d9 MH |
306 | goto end_dwarf; |
307 | } | |
4ea42b18 MH |
308 | |
309 | /* Searching probe points */ | |
d1bde3f7 MH |
310 | for (i = 0; i < session.nr_probe; i++) { |
311 | pp = &session.probes[i]; | |
4ea42b18 MH |
312 | if (pp->found) |
313 | continue; | |
314 | ||
315 | lseek(fd, SEEK_SET, 0); | |
81cb8aa3 | 316 | ret = find_probe_point(fd, pp); |
411edfe5 MH |
317 | if (ret > 0) |
318 | continue; | |
7ef17aaf MH |
319 | if (ret == 0) { /* No error but failed to find probe point. */ |
320 | synthesize_perf_probe_point(pp); | |
321 | die("Probe point '%s' not found. - probe not added.", | |
322 | pp->probes[0]); | |
323 | } | |
411edfe5 MH |
324 | /* Error path */ |
325 | if (session.need_dwarf) { | |
326 | if (ret == -ENOENT) | |
327 | pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
328 | die("Could not analyze debuginfo."); | |
329 | } | |
330 | pr_debug("An error occurred in debuginfo analysis." | |
331 | " Try to use symbols.\n"); | |
332 | break; | |
4ea42b18 MH |
333 | } |
334 | close(fd); | |
335 | ||
a225a1d9 | 336 | end_dwarf: |
804b3606 | 337 | #endif /* !NO_DWARF_SUPPORT */ |
23e8ec0d | 338 | |
a225a1d9 | 339 | /* Synthesize probes without dwarf */ |
d1bde3f7 MH |
340 | for (i = 0; i < session.nr_probe; i++) { |
341 | pp = &session.probes[i]; | |
a225a1d9 MH |
342 | if (pp->found) /* This probe is already found. */ |
343 | continue; | |
344 | ||
62bdc1b3 | 345 | evaluate_probe_point(pp); |
50656eec | 346 | ret = synthesize_trace_kprobe_event(pp); |
a225a1d9 | 347 | if (ret == -E2BIG) |
50656eec | 348 | die("probe point definition becomes too long."); |
a225a1d9 MH |
349 | else if (ret < 0) |
350 | die("Failed to synthesize a probe point."); | |
351 | } | |
352 | ||
4ea42b18 | 353 | /* Settng up probe points */ |
d761b08b MH |
354 | add_trace_kprobe_events(session.probes, session.nr_probe, |
355 | session.force_add); | |
4ea42b18 MH |
356 | return 0; |
357 | } | |
358 |