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1#include <linux/types.h>
2#include <stdlib.h>
3#include <unistd.h>
4#include <stdio.h>
5#include <ctype.h>
6#include <string.h>
7
8#include "parse-events.h"
9#include "evlist.h"
10#include "evsel.h"
11#include "thread_map.h"
12#include "cpumap.h"
13#include "machine.h"
14#include "event.h"
15#include "thread.h"
16
17#include "tests.h"
18
19#define BUFSZ 1024
20#define READLEN 128
21
22struct state {
23 u64 done[1024];
24 size_t done_cnt;
25};
26
27static unsigned int hex(char c)
28{
29 if (c >= '0' && c <= '9')
30 return c - '0';
31 if (c >= 'a' && c <= 'f')
32 return c - 'a' + 10;
33 return c - 'A' + 10;
34}
35
36static size_t read_objdump_line(const char *line, size_t line_len, void *buf,
37 size_t len)
38{
39 const char *p;
40 size_t i, j = 0;
41
42 /* Skip to a colon */
43 p = strchr(line, ':');
44 if (!p)
45 return 0;
46 i = p + 1 - line;
47
48 /* Read bytes */
49 while (j < len) {
50 char c1, c2;
51
52 /* Skip spaces */
53 for (; i < line_len; i++) {
54 if (!isspace(line[i]))
55 break;
56 }
57 /* Get 2 hex digits */
58 if (i >= line_len || !isxdigit(line[i]))
59 break;
60 c1 = line[i++];
61 if (i >= line_len || !isxdigit(line[i]))
62 break;
63 c2 = line[i++];
64 /* Followed by a space */
65 if (i < line_len && line[i] && !isspace(line[i]))
66 break;
67 /* Store byte */
68 *(unsigned char *)buf = (hex(c1) << 4) | hex(c2);
69 buf += 1;
70 j++;
71 }
72 /* return number of successfully read bytes */
73 return j;
74}
75
76static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
77{
78 char *line = NULL;
79 size_t line_len, off_last = 0;
80 ssize_t ret;
81 int err = 0;
82 u64 addr, last_addr = start_addr;
83
84 while (off_last < *len) {
85 size_t off, read_bytes, written_bytes;
86 unsigned char tmp[BUFSZ];
87
88 ret = getline(&line, &line_len, f);
89 if (feof(f))
90 break;
91 if (ret < 0) {
92 pr_debug("getline failed\n");
93 err = -1;
94 break;
95 }
96
97 /* read objdump data into temporary buffer */
98 read_bytes = read_objdump_line(line, ret, tmp, sizeof(tmp));
99 if (!read_bytes)
100 continue;
101
102 if (sscanf(line, "%"PRIx64, &addr) != 1)
103 continue;
104 if (addr < last_addr) {
105 pr_debug("addr going backwards, read beyond section?\n");
106 break;
107 }
108 last_addr = addr;
109
110 /* copy it from temporary buffer to 'buf' according
111 * to address on current objdump line */
112 off = addr - start_addr;
113 if (off >= *len)
114 break;
115 written_bytes = MIN(read_bytes, *len - off);
116 memcpy(buf + off, tmp, written_bytes);
117 off_last = off + written_bytes;
118 }
119
120 /* len returns number of bytes that could not be read */
121 *len -= off_last;
122
123 free(line);
124
125 return err;
126}
127
128static int read_via_objdump(const char *filename, u64 addr, void *buf,
129 size_t len)
130{
131 char cmd[PATH_MAX * 2];
132 const char *fmt;
133 FILE *f;
134 int ret;
135
136 fmt = "%s -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
137 ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
138 filename);
139 if (ret <= 0 || (size_t)ret >= sizeof(cmd))
140 return -1;
141
142 pr_debug("Objdump command is: %s\n", cmd);
143
144 /* Ignore objdump errors */
145 strcat(cmd, " 2>/dev/null");
146
147 f = popen(cmd, "r");
148 if (!f) {
149 pr_debug("popen failed\n");
150 return -1;
151 }
152
153 ret = read_objdump_output(f, buf, &len, addr);
154 if (len) {
155 pr_debug("objdump read too few bytes\n");
156 if (!ret)
157 ret = len;
158 }
159
160 pclose(f);
161
162 return ret;
163}
164
165static void dump_buf(unsigned char *buf, size_t len)
166{
167 size_t i;
168
169 for (i = 0; i < len; i++) {
170 pr_debug("0x%02x ", buf[i]);
171 if (i % 16 == 15)
172 pr_debug("\n");
173 }
174 pr_debug("\n");
175}
176
177static int read_object_code(u64 addr, size_t len, u8 cpumode,
178 struct thread *thread, struct state *state)
179{
180 struct addr_location al;
181 unsigned char buf1[BUFSZ];
182 unsigned char buf2[BUFSZ];
183 size_t ret_len;
184 u64 objdump_addr;
185 int ret;
186
187 pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
188
189 thread__find_addr_map(thread, cpumode, MAP__FUNCTION, addr, &al);
190 if (!al.map || !al.map->dso) {
191 pr_debug("thread__find_addr_map failed\n");
192 return -1;
193 }
194
195 pr_debug("File is: %s\n", al.map->dso->long_name);
196
197 if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
198 !dso__is_kcore(al.map->dso)) {
199 pr_debug("Unexpected kernel address - skipping\n");
200 return 0;
201 }
202
203 pr_debug("On file address is: %#"PRIx64"\n", al.addr);
204
205 if (len > BUFSZ)
206 len = BUFSZ;
207
208 /* Do not go off the map */
209 if (addr + len > al.map->end)
210 len = al.map->end - addr;
211
212 /* Read the object code using perf */
213 ret_len = dso__data_read_offset(al.map->dso, thread->mg->machine,
214 al.addr, buf1, len);
215 if (ret_len != len) {
216 pr_debug("dso__data_read_offset failed\n");
217 return -1;
218 }
219
220 /*
221 * Converting addresses for use by objdump requires more information.
222 * map__load() does that. See map__rip_2objdump() for details.
223 */
224 if (map__load(al.map, NULL))
225 return -1;
226
227 /* objdump struggles with kcore - try each map only once */
228 if (dso__is_kcore(al.map->dso)) {
229 size_t d;
230
231 for (d = 0; d < state->done_cnt; d++) {
232 if (state->done[d] == al.map->start) {
233 pr_debug("kcore map tested already");
234 pr_debug(" - skipping\n");
235 return 0;
236 }
237 }
238 if (state->done_cnt >= ARRAY_SIZE(state->done)) {
239 pr_debug("Too many kcore maps - skipping\n");
240 return 0;
241 }
242 state->done[state->done_cnt++] = al.map->start;
243 }
244
245 /* Read the object code using objdump */
246 objdump_addr = map__rip_2objdump(al.map, al.addr);
247 ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
248 if (ret > 0) {
249 /*
250 * The kernel maps are inaccurate - assume objdump is right in
251 * that case.
252 */
253 if (cpumode == PERF_RECORD_MISC_KERNEL ||
254 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
255 len -= ret;
256 if (len) {
257 pr_debug("Reducing len to %zu\n", len);
258 } else if (dso__is_kcore(al.map->dso)) {
259 /*
260 * objdump cannot handle very large segments
261 * that may be found in kcore.
262 */
263 pr_debug("objdump failed for kcore");
264 pr_debug(" - skipping\n");
265 return 0;
266 } else {
267 return -1;
268 }
269 }
270 }
271 if (ret < 0) {
272 pr_debug("read_via_objdump failed\n");
273 return -1;
274 }
275
276 /* The results should be identical */
277 if (memcmp(buf1, buf2, len)) {
278 pr_debug("Bytes read differ from those read by objdump\n");
279 pr_debug("buf1 (dso):\n");
280 dump_buf(buf1, len);
281 pr_debug("buf2 (objdump):\n");
282 dump_buf(buf2, len);
283 return -1;
284 }
285 pr_debug("Bytes read match those read by objdump\n");
286
287 return 0;
288}
289
290static int process_sample_event(struct machine *machine,
291 struct perf_evlist *evlist,
292 union perf_event *event, struct state *state)
293{
294 struct perf_sample sample;
295 struct thread *thread;
296 int ret;
297
298 if (perf_evlist__parse_sample(evlist, event, &sample)) {
299 pr_debug("perf_evlist__parse_sample failed\n");
300 return -1;
301 }
302
303 thread = machine__findnew_thread(machine, sample.pid, sample.tid);
304 if (!thread) {
305 pr_debug("machine__findnew_thread failed\n");
306 return -1;
307 }
308
309 ret = read_object_code(sample.ip, READLEN, sample.cpumode, thread, state);
310 thread__put(thread);
311 return ret;
312}
313
314static int process_event(struct machine *machine, struct perf_evlist *evlist,
315 union perf_event *event, struct state *state)
316{
317 if (event->header.type == PERF_RECORD_SAMPLE)
318 return process_sample_event(machine, evlist, event, state);
319
320 if (event->header.type == PERF_RECORD_THROTTLE ||
321 event->header.type == PERF_RECORD_UNTHROTTLE)
322 return 0;
323
324 if (event->header.type < PERF_RECORD_MAX) {
325 int ret;
326
327 ret = machine__process_event(machine, event, NULL);
328 if (ret < 0)
329 pr_debug("machine__process_event failed, event type %u\n",
330 event->header.type);
331 return ret;
332 }
333
334 return 0;
335}
336
337static int process_events(struct machine *machine, struct perf_evlist *evlist,
338 struct state *state)
339{
340 union perf_event *event;
341 int i, ret;
342
343 for (i = 0; i < evlist->nr_mmaps; i++) {
344 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
345 ret = process_event(machine, evlist, event, state);
346 perf_evlist__mmap_consume(evlist, i);
347 if (ret < 0)
348 return ret;
349 }
350 }
351 return 0;
352}
353
354static int comp(const void *a, const void *b)
355{
356 return *(int *)a - *(int *)b;
357}
358
359static void do_sort_something(void)
360{
361 int buf[40960], i;
362
363 for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
364 buf[i] = ARRAY_SIZE(buf) - i - 1;
365
366 qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
367
368 for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
369 if (buf[i] != i) {
370 pr_debug("qsort failed\n");
371 break;
372 }
373 }
374}
375
376static void sort_something(void)
377{
378 int i;
379
380 for (i = 0; i < 10; i++)
381 do_sort_something();
382}
383
384static void syscall_something(void)
385{
386 int pipefd[2];
387 int i;
388
389 for (i = 0; i < 1000; i++) {
390 if (pipe(pipefd) < 0) {
391 pr_debug("pipe failed\n");
392 break;
393 }
394 close(pipefd[1]);
395 close(pipefd[0]);
396 }
397}
398
399static void fs_something(void)
400{
401 const char *test_file_name = "temp-perf-code-reading-test-file--";
402 FILE *f;
403 int i;
404
405 for (i = 0; i < 1000; i++) {
406 f = fopen(test_file_name, "w+");
407 if (f) {
408 fclose(f);
409 unlink(test_file_name);
410 }
411 }
412}
413
414static void do_something(void)
415{
416 fs_something();
417
418 sort_something();
419
420 syscall_something();
421}
422
423enum {
424 TEST_CODE_READING_OK,
425 TEST_CODE_READING_NO_VMLINUX,
426 TEST_CODE_READING_NO_KCORE,
427 TEST_CODE_READING_NO_ACCESS,
428 TEST_CODE_READING_NO_KERNEL_OBJ,
429};
430
431static int do_test_code_reading(bool try_kcore)
432{
433 struct machine *machine;
434 struct thread *thread;
435 struct record_opts opts = {
436 .mmap_pages = UINT_MAX,
437 .user_freq = UINT_MAX,
438 .user_interval = ULLONG_MAX,
439 .freq = 500,
440 .target = {
441 .uses_mmap = true,
442 },
443 };
444 struct state state = {
445 .done_cnt = 0,
446 };
447 struct thread_map *threads = NULL;
448 struct cpu_map *cpus = NULL;
449 struct perf_evlist *evlist = NULL;
450 struct perf_evsel *evsel = NULL;
451 int err = -1, ret;
452 pid_t pid;
453 struct map *map;
454 bool have_vmlinux, have_kcore, excl_kernel = false;
455
456 pid = getpid();
457
458 machine = machine__new_host();
459
460 ret = machine__create_kernel_maps(machine);
461 if (ret < 0) {
462 pr_debug("machine__create_kernel_maps failed\n");
463 goto out_err;
464 }
465
466 /* Force the use of kallsyms instead of vmlinux to try kcore */
467 if (try_kcore)
468 symbol_conf.kallsyms_name = "/proc/kallsyms";
469
470 /* Load kernel map */
471 map = machine__kernel_map(machine);
472 ret = map__load(map, NULL);
473 if (ret < 0) {
474 pr_debug("map__load failed\n");
475 goto out_err;
476 }
477 have_vmlinux = dso__is_vmlinux(map->dso);
478 have_kcore = dso__is_kcore(map->dso);
479
480 /* 2nd time through we just try kcore */
481 if (try_kcore && !have_kcore)
482 return TEST_CODE_READING_NO_KCORE;
483
484 /* No point getting kernel events if there is no kernel object */
485 if (!have_vmlinux && !have_kcore)
486 excl_kernel = true;
487
488 threads = thread_map__new_by_tid(pid);
489 if (!threads) {
490 pr_debug("thread_map__new_by_tid failed\n");
491 goto out_err;
492 }
493
494 ret = perf_event__synthesize_thread_map(NULL, threads,
495 perf_event__process, machine, false, 500);
496 if (ret < 0) {
497 pr_debug("perf_event__synthesize_thread_map failed\n");
498 goto out_err;
499 }
500
501 thread = machine__findnew_thread(machine, pid, pid);
502 if (!thread) {
503 pr_debug("machine__findnew_thread failed\n");
504 goto out_put;
505 }
506
507 cpus = cpu_map__new(NULL);
508 if (!cpus) {
509 pr_debug("cpu_map__new failed\n");
510 goto out_put;
511 }
512
513 while (1) {
514 const char *str;
515
516 evlist = perf_evlist__new();
517 if (!evlist) {
518 pr_debug("perf_evlist__new failed\n");
519 goto out_put;
520 }
521
522 perf_evlist__set_maps(evlist, cpus, threads);
523
524 if (excl_kernel)
525 str = "cycles:u";
526 else
527 str = "cycles";
528 pr_debug("Parsing event '%s'\n", str);
529 ret = parse_events(evlist, str, NULL);
530 if (ret < 0) {
531 pr_debug("parse_events failed\n");
532 goto out_put;
533 }
534
535 perf_evlist__config(evlist, &opts);
536
537 evsel = perf_evlist__first(evlist);
538
539 evsel->attr.comm = 1;
540 evsel->attr.disabled = 1;
541 evsel->attr.enable_on_exec = 0;
542
543 ret = perf_evlist__open(evlist);
544 if (ret < 0) {
545 if (!excl_kernel) {
546 excl_kernel = true;
547 /*
548 * Both cpus and threads are now owned by evlist
549 * and will be freed by following perf_evlist__set_maps
550 * call. Getting refference to keep them alive.
551 */
552 cpu_map__get(cpus);
553 thread_map__get(threads);
554 perf_evlist__set_maps(evlist, NULL, NULL);
555 perf_evlist__delete(evlist);
556 evlist = NULL;
557 continue;
558 }
559
560 if (verbose) {
561 char errbuf[512];
562 perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
563 pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
564 }
565
566 goto out_put;
567 }
568 break;
569 }
570
571 ret = perf_evlist__mmap(evlist, UINT_MAX, false);
572 if (ret < 0) {
573 pr_debug("perf_evlist__mmap failed\n");
574 goto out_put;
575 }
576
577 perf_evlist__enable(evlist);
578
579 do_something();
580
581 perf_evlist__disable(evlist);
582
583 ret = process_events(machine, evlist, &state);
584 if (ret < 0)
585 goto out_put;
586
587 if (!have_vmlinux && !have_kcore && !try_kcore)
588 err = TEST_CODE_READING_NO_KERNEL_OBJ;
589 else if (!have_vmlinux && !try_kcore)
590 err = TEST_CODE_READING_NO_VMLINUX;
591 else if (excl_kernel)
592 err = TEST_CODE_READING_NO_ACCESS;
593 else
594 err = TEST_CODE_READING_OK;
595out_put:
596 thread__put(thread);
597out_err:
598
599 if (evlist) {
600 perf_evlist__delete(evlist);
601 } else {
602 cpu_map__put(cpus);
603 thread_map__put(threads);
604 }
605 machine__delete_threads(machine);
606 machine__delete(machine);
607
608 return err;
609}
610
611int test__code_reading(int subtest __maybe_unused)
612{
613 int ret;
614
615 ret = do_test_code_reading(false);
616 if (!ret)
617 ret = do_test_code_reading(true);
618
619 switch (ret) {
620 case TEST_CODE_READING_OK:
621 return 0;
622 case TEST_CODE_READING_NO_VMLINUX:
623 pr_debug("no vmlinux\n");
624 return 0;
625 case TEST_CODE_READING_NO_KCORE:
626 pr_debug("no kcore\n");
627 return 0;
628 case TEST_CODE_READING_NO_ACCESS:
629 pr_debug("no access\n");
630 return 0;
631 case TEST_CODE_READING_NO_KERNEL_OBJ:
632 pr_debug("no kernel obj\n");
633 return 0;
634 default:
635 return -1;
636 };
637}
1#include <sys/types.h>
2#include <stdlib.h>
3#include <unistd.h>
4#include <stdio.h>
5#include <inttypes.h>
6#include <ctype.h>
7#include <string.h>
8
9#include "parse-events.h"
10#include "evlist.h"
11#include "evsel.h"
12#include "thread_map.h"
13#include "cpumap.h"
14#include "machine.h"
15#include "event.h"
16#include "thread.h"
17
18#include "tests.h"
19
20#define BUFSZ 1024
21#define READLEN 128
22
23struct state {
24 u64 done[1024];
25 size_t done_cnt;
26};
27
28static unsigned int hex(char c)
29{
30 if (c >= '0' && c <= '9')
31 return c - '0';
32 if (c >= 'a' && c <= 'f')
33 return c - 'a' + 10;
34 return c - 'A' + 10;
35}
36
37static void read_objdump_line(const char *line, size_t line_len, void **buf,
38 size_t *len)
39{
40 const char *p;
41 size_t i;
42
43 /* Skip to a colon */
44 p = strchr(line, ':');
45 if (!p)
46 return;
47 i = p + 1 - line;
48
49 /* Read bytes */
50 while (*len) {
51 char c1, c2;
52
53 /* Skip spaces */
54 for (; i < line_len; i++) {
55 if (!isspace(line[i]))
56 break;
57 }
58 /* Get 2 hex digits */
59 if (i >= line_len || !isxdigit(line[i]))
60 break;
61 c1 = line[i++];
62 if (i >= line_len || !isxdigit(line[i]))
63 break;
64 c2 = line[i++];
65 /* Followed by a space */
66 if (i < line_len && line[i] && !isspace(line[i]))
67 break;
68 /* Store byte */
69 *(unsigned char *)*buf = (hex(c1) << 4) | hex(c2);
70 *buf += 1;
71 *len -= 1;
72 }
73}
74
75static int read_objdump_output(FILE *f, void **buf, size_t *len)
76{
77 char *line = NULL;
78 size_t line_len;
79 ssize_t ret;
80 int err = 0;
81
82 while (1) {
83 ret = getline(&line, &line_len, f);
84 if (feof(f))
85 break;
86 if (ret < 0) {
87 pr_debug("getline failed\n");
88 err = -1;
89 break;
90 }
91 read_objdump_line(line, ret, buf, len);
92 }
93
94 free(line);
95
96 return err;
97}
98
99static int read_via_objdump(const char *filename, u64 addr, void *buf,
100 size_t len)
101{
102 char cmd[PATH_MAX * 2];
103 const char *fmt;
104 FILE *f;
105 int ret;
106
107 fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
108 ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
109 filename);
110 if (ret <= 0 || (size_t)ret >= sizeof(cmd))
111 return -1;
112
113 pr_debug("Objdump command is: %s\n", cmd);
114
115 /* Ignore objdump errors */
116 strcat(cmd, " 2>/dev/null");
117
118 f = popen(cmd, "r");
119 if (!f) {
120 pr_debug("popen failed\n");
121 return -1;
122 }
123
124 ret = read_objdump_output(f, &buf, &len);
125 if (len) {
126 pr_debug("objdump read too few bytes\n");
127 if (!ret)
128 ret = len;
129 }
130
131 pclose(f);
132
133 return ret;
134}
135
136static int read_object_code(u64 addr, size_t len, u8 cpumode,
137 struct thread *thread, struct machine *machine,
138 struct state *state)
139{
140 struct addr_location al;
141 unsigned char buf1[BUFSZ];
142 unsigned char buf2[BUFSZ];
143 size_t ret_len;
144 u64 objdump_addr;
145 int ret;
146
147 pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
148
149 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION, addr,
150 &al);
151 if (!al.map || !al.map->dso) {
152 pr_debug("thread__find_addr_map failed\n");
153 return -1;
154 }
155
156 pr_debug("File is: %s\n", al.map->dso->long_name);
157
158 if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
159 !dso__is_kcore(al.map->dso)) {
160 pr_debug("Unexpected kernel address - skipping\n");
161 return 0;
162 }
163
164 pr_debug("On file address is: %#"PRIx64"\n", al.addr);
165
166 if (len > BUFSZ)
167 len = BUFSZ;
168
169 /* Do not go off the map */
170 if (addr + len > al.map->end)
171 len = al.map->end - addr;
172
173 /* Read the object code using perf */
174 ret_len = dso__data_read_offset(al.map->dso, machine, al.addr, buf1,
175 len);
176 if (ret_len != len) {
177 pr_debug("dso__data_read_offset failed\n");
178 return -1;
179 }
180
181 /*
182 * Converting addresses for use by objdump requires more information.
183 * map__load() does that. See map__rip_2objdump() for details.
184 */
185 if (map__load(al.map, NULL))
186 return -1;
187
188 /* objdump struggles with kcore - try each map only once */
189 if (dso__is_kcore(al.map->dso)) {
190 size_t d;
191
192 for (d = 0; d < state->done_cnt; d++) {
193 if (state->done[d] == al.map->start) {
194 pr_debug("kcore map tested already");
195 pr_debug(" - skipping\n");
196 return 0;
197 }
198 }
199 if (state->done_cnt >= ARRAY_SIZE(state->done)) {
200 pr_debug("Too many kcore maps - skipping\n");
201 return 0;
202 }
203 state->done[state->done_cnt++] = al.map->start;
204 }
205
206 /* Read the object code using objdump */
207 objdump_addr = map__rip_2objdump(al.map, al.addr);
208 ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
209 if (ret > 0) {
210 /*
211 * The kernel maps are inaccurate - assume objdump is right in
212 * that case.
213 */
214 if (cpumode == PERF_RECORD_MISC_KERNEL ||
215 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
216 len -= ret;
217 if (len) {
218 pr_debug("Reducing len to %zu\n", len);
219 } else if (dso__is_kcore(al.map->dso)) {
220 /*
221 * objdump cannot handle very large segments
222 * that may be found in kcore.
223 */
224 pr_debug("objdump failed for kcore");
225 pr_debug(" - skipping\n");
226 return 0;
227 } else {
228 return -1;
229 }
230 }
231 }
232 if (ret < 0) {
233 pr_debug("read_via_objdump failed\n");
234 return -1;
235 }
236
237 /* The results should be identical */
238 if (memcmp(buf1, buf2, len)) {
239 pr_debug("Bytes read differ from those read by objdump\n");
240 return -1;
241 }
242 pr_debug("Bytes read match those read by objdump\n");
243
244 return 0;
245}
246
247static int process_sample_event(struct machine *machine,
248 struct perf_evlist *evlist,
249 union perf_event *event, struct state *state)
250{
251 struct perf_sample sample;
252 struct thread *thread;
253 u8 cpumode;
254
255 if (perf_evlist__parse_sample(evlist, event, &sample)) {
256 pr_debug("perf_evlist__parse_sample failed\n");
257 return -1;
258 }
259
260 thread = machine__findnew_thread(machine, sample.pid, sample.pid);
261 if (!thread) {
262 pr_debug("machine__findnew_thread failed\n");
263 return -1;
264 }
265
266 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
267
268 return read_object_code(sample.ip, READLEN, cpumode, thread, machine,
269 state);
270}
271
272static int process_event(struct machine *machine, struct perf_evlist *evlist,
273 union perf_event *event, struct state *state)
274{
275 if (event->header.type == PERF_RECORD_SAMPLE)
276 return process_sample_event(machine, evlist, event, state);
277
278 if (event->header.type == PERF_RECORD_THROTTLE ||
279 event->header.type == PERF_RECORD_UNTHROTTLE)
280 return 0;
281
282 if (event->header.type < PERF_RECORD_MAX) {
283 int ret;
284
285 ret = machine__process_event(machine, event, NULL);
286 if (ret < 0)
287 pr_debug("machine__process_event failed, event type %u\n",
288 event->header.type);
289 return ret;
290 }
291
292 return 0;
293}
294
295static int process_events(struct machine *machine, struct perf_evlist *evlist,
296 struct state *state)
297{
298 union perf_event *event;
299 int i, ret;
300
301 for (i = 0; i < evlist->nr_mmaps; i++) {
302 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
303 ret = process_event(machine, evlist, event, state);
304 perf_evlist__mmap_consume(evlist, i);
305 if (ret < 0)
306 return ret;
307 }
308 }
309 return 0;
310}
311
312static int comp(const void *a, const void *b)
313{
314 return *(int *)a - *(int *)b;
315}
316
317static void do_sort_something(void)
318{
319 int buf[40960], i;
320
321 for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
322 buf[i] = ARRAY_SIZE(buf) - i - 1;
323
324 qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
325
326 for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
327 if (buf[i] != i) {
328 pr_debug("qsort failed\n");
329 break;
330 }
331 }
332}
333
334static void sort_something(void)
335{
336 int i;
337
338 for (i = 0; i < 10; i++)
339 do_sort_something();
340}
341
342static void syscall_something(void)
343{
344 int pipefd[2];
345 int i;
346
347 for (i = 0; i < 1000; i++) {
348 if (pipe(pipefd) < 0) {
349 pr_debug("pipe failed\n");
350 break;
351 }
352 close(pipefd[1]);
353 close(pipefd[0]);
354 }
355}
356
357static void fs_something(void)
358{
359 const char *test_file_name = "temp-perf-code-reading-test-file--";
360 FILE *f;
361 int i;
362
363 for (i = 0; i < 1000; i++) {
364 f = fopen(test_file_name, "w+");
365 if (f) {
366 fclose(f);
367 unlink(test_file_name);
368 }
369 }
370}
371
372static void do_something(void)
373{
374 fs_something();
375
376 sort_something();
377
378 syscall_something();
379}
380
381enum {
382 TEST_CODE_READING_OK,
383 TEST_CODE_READING_NO_VMLINUX,
384 TEST_CODE_READING_NO_KCORE,
385 TEST_CODE_READING_NO_ACCESS,
386 TEST_CODE_READING_NO_KERNEL_OBJ,
387};
388
389static int do_test_code_reading(bool try_kcore)
390{
391 struct machines machines;
392 struct machine *machine;
393 struct thread *thread;
394 struct record_opts opts = {
395 .mmap_pages = UINT_MAX,
396 .user_freq = UINT_MAX,
397 .user_interval = ULLONG_MAX,
398 .freq = 4000,
399 .target = {
400 .uses_mmap = true,
401 },
402 };
403 struct state state = {
404 .done_cnt = 0,
405 };
406 struct thread_map *threads = NULL;
407 struct cpu_map *cpus = NULL;
408 struct perf_evlist *evlist = NULL;
409 struct perf_evsel *evsel = NULL;
410 int err = -1, ret;
411 pid_t pid;
412 struct map *map;
413 bool have_vmlinux, have_kcore, excl_kernel = false;
414
415 pid = getpid();
416
417 machines__init(&machines);
418 machine = &machines.host;
419
420 ret = machine__create_kernel_maps(machine);
421 if (ret < 0) {
422 pr_debug("machine__create_kernel_maps failed\n");
423 goto out_err;
424 }
425
426 /* Force the use of kallsyms instead of vmlinux to try kcore */
427 if (try_kcore)
428 symbol_conf.kallsyms_name = "/proc/kallsyms";
429
430 /* Load kernel map */
431 map = machine->vmlinux_maps[MAP__FUNCTION];
432 ret = map__load(map, NULL);
433 if (ret < 0) {
434 pr_debug("map__load failed\n");
435 goto out_err;
436 }
437 have_vmlinux = dso__is_vmlinux(map->dso);
438 have_kcore = dso__is_kcore(map->dso);
439
440 /* 2nd time through we just try kcore */
441 if (try_kcore && !have_kcore)
442 return TEST_CODE_READING_NO_KCORE;
443
444 /* No point getting kernel events if there is no kernel object */
445 if (!have_vmlinux && !have_kcore)
446 excl_kernel = true;
447
448 threads = thread_map__new_by_tid(pid);
449 if (!threads) {
450 pr_debug("thread_map__new_by_tid failed\n");
451 goto out_err;
452 }
453
454 ret = perf_event__synthesize_thread_map(NULL, threads,
455 perf_event__process, machine, false);
456 if (ret < 0) {
457 pr_debug("perf_event__synthesize_thread_map failed\n");
458 goto out_err;
459 }
460
461 thread = machine__findnew_thread(machine, pid, pid);
462 if (!thread) {
463 pr_debug("machine__findnew_thread failed\n");
464 goto out_err;
465 }
466
467 cpus = cpu_map__new(NULL);
468 if (!cpus) {
469 pr_debug("cpu_map__new failed\n");
470 goto out_err;
471 }
472
473 while (1) {
474 const char *str;
475
476 evlist = perf_evlist__new();
477 if (!evlist) {
478 pr_debug("perf_evlist__new failed\n");
479 goto out_err;
480 }
481
482 perf_evlist__set_maps(evlist, cpus, threads);
483
484 if (excl_kernel)
485 str = "cycles:u";
486 else
487 str = "cycles";
488 pr_debug("Parsing event '%s'\n", str);
489 ret = parse_events(evlist, str);
490 if (ret < 0) {
491 pr_debug("parse_events failed\n");
492 goto out_err;
493 }
494
495 perf_evlist__config(evlist, &opts);
496
497 evsel = perf_evlist__first(evlist);
498
499 evsel->attr.comm = 1;
500 evsel->attr.disabled = 1;
501 evsel->attr.enable_on_exec = 0;
502
503 ret = perf_evlist__open(evlist);
504 if (ret < 0) {
505 if (!excl_kernel) {
506 excl_kernel = true;
507 perf_evlist__set_maps(evlist, NULL, NULL);
508 perf_evlist__delete(evlist);
509 evlist = NULL;
510 continue;
511 }
512 pr_debug("perf_evlist__open failed\n");
513 goto out_err;
514 }
515 break;
516 }
517
518 ret = perf_evlist__mmap(evlist, UINT_MAX, false);
519 if (ret < 0) {
520 pr_debug("perf_evlist__mmap failed\n");
521 goto out_err;
522 }
523
524 perf_evlist__enable(evlist);
525
526 do_something();
527
528 perf_evlist__disable(evlist);
529
530 ret = process_events(machine, evlist, &state);
531 if (ret < 0)
532 goto out_err;
533
534 if (!have_vmlinux && !have_kcore && !try_kcore)
535 err = TEST_CODE_READING_NO_KERNEL_OBJ;
536 else if (!have_vmlinux && !try_kcore)
537 err = TEST_CODE_READING_NO_VMLINUX;
538 else if (excl_kernel)
539 err = TEST_CODE_READING_NO_ACCESS;
540 else
541 err = TEST_CODE_READING_OK;
542out_err:
543 if (evlist) {
544 perf_evlist__delete(evlist);
545 } else {
546 cpu_map__delete(cpus);
547 thread_map__delete(threads);
548 }
549 machines__destroy_kernel_maps(&machines);
550 machine__delete_threads(machine);
551 machines__exit(&machines);
552
553 return err;
554}
555
556int test__code_reading(void)
557{
558 int ret;
559
560 ret = do_test_code_reading(false);
561 if (!ret)
562 ret = do_test_code_reading(true);
563
564 switch (ret) {
565 case TEST_CODE_READING_OK:
566 return 0;
567 case TEST_CODE_READING_NO_VMLINUX:
568 fprintf(stderr, " (no vmlinux)");
569 return 0;
570 case TEST_CODE_READING_NO_KCORE:
571 fprintf(stderr, " (no kcore)");
572 return 0;
573 case TEST_CODE_READING_NO_ACCESS:
574 fprintf(stderr, " (no access)");
575 return 0;
576 case TEST_CODE_READING_NO_KERNEL_OBJ:
577 fprintf(stderr, " (no kernel obj)");
578 return 0;
579 default:
580 return -1;
581 };
582}