9 #include "parse-events.h"
12 #include "thread_map.h"
28 static unsigned int hex(char c)
30 if (c >= '0' && c <= '9')
32 if (c >= 'a' && c <= 'f')
37 static void read_objdump_line(const char *line, size_t line_len, void **buf,
44 p = strchr(line, ':');
54 for (; i < line_len; i++) {
55 if (!isspace(line[i]))
58 /* Get 2 hex digits */
59 if (i >= line_len || !isxdigit(line[i]))
62 if (i >= line_len || !isxdigit(line[i]))
65 /* Followed by a space */
66 if (i < line_len && line[i] && !isspace(line[i]))
69 *(unsigned char *)*buf = (hex(c1) << 4) | hex(c2);
75 static int read_objdump_output(FILE *f, void **buf, size_t *len)
83 ret = getline(&line, &line_len, f);
87 pr_debug("getline failed\n");
91 read_objdump_line(line, ret, buf, len);
99 static int read_via_objdump(const char *filename, u64 addr, void *buf,
102 char cmd[PATH_MAX * 2];
107 fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
108 ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
110 if (ret <= 0 || (size_t)ret >= sizeof(cmd))
113 pr_debug("Objdump command is: %s\n", cmd);
115 /* Ignore objdump errors */
116 strcat(cmd, " 2>/dev/null");
120 pr_debug("popen failed\n");
124 ret = read_objdump_output(f, &buf, &len);
126 pr_debug("objdump read too few bytes\n");
136 static int read_object_code(u64 addr, size_t len, u8 cpumode,
137 struct thread *thread, struct machine *machine,
140 struct addr_location al;
141 unsigned char buf1[BUFSZ];
142 unsigned char buf2[BUFSZ];
147 pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
149 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION, addr,
151 if (!al.map || !al.map->dso) {
152 pr_debug("thread__find_addr_map failed\n");
156 pr_debug("File is: %s\n", al.map->dso->long_name);
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");
164 pr_debug("On file address is: %#"PRIx64"\n", al.addr);
169 /* Do not go off the map */
170 if (addr + len > al.map->end)
171 len = al.map->end - addr;
173 /* Read the object code using perf */
174 ret_len = dso__data_read_offset(al.map->dso, machine, al.addr, buf1,
176 if (ret_len != len) {
177 pr_debug("dso__data_read_offset failed\n");
182 * Converting addresses for use by objdump requires more information.
183 * map__load() does that. See map__rip_2objdump() for details.
185 if (map__load(al.map, NULL))
188 /* objdump struggles with kcore - try each map only once */
189 if (dso__is_kcore(al.map->dso)) {
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");
199 if (state->done_cnt >= ARRAY_SIZE(state->done)) {
200 pr_debug("Too many kcore maps - skipping\n");
203 state->done[state->done_cnt++] = al.map->start;
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);
211 * The kernel maps are inaccurate - assume objdump is right in
214 if (cpumode == PERF_RECORD_MISC_KERNEL ||
215 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
218 pr_debug("Reducing len to %zu\n", len);
219 } else if (dso__is_kcore(al.map->dso)) {
221 * objdump cannot handle very large segments
222 * that may be found in kcore.
224 pr_debug("objdump failed for kcore");
225 pr_debug(" - skipping\n");
233 pr_debug("read_via_objdump failed\n");
237 /* The results should be identical */
238 if (memcmp(buf1, buf2, len)) {
239 pr_debug("Bytes read differ from those read by objdump\n");
242 pr_debug("Bytes read match those read by objdump\n");
247 static int process_sample_event(struct machine *machine,
248 struct perf_evlist *evlist,
249 union perf_event *event, struct state *state)
251 struct perf_sample sample;
252 struct thread *thread;
255 if (perf_evlist__parse_sample(evlist, event, &sample)) {
256 pr_debug("perf_evlist__parse_sample failed\n");
260 thread = machine__findnew_thread(machine, sample.pid, sample.pid);
262 pr_debug("machine__findnew_thread failed\n");
266 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
268 return read_object_code(sample.ip, READLEN, cpumode, thread, machine,
272 static int process_event(struct machine *machine, struct perf_evlist *evlist,
273 union perf_event *event, struct state *state)
275 if (event->header.type == PERF_RECORD_SAMPLE)
276 return process_sample_event(machine, evlist, event, state);
278 if (event->header.type == PERF_RECORD_THROTTLE ||
279 event->header.type == PERF_RECORD_UNTHROTTLE)
282 if (event->header.type < PERF_RECORD_MAX) {
285 ret = machine__process_event(machine, event, NULL);
287 pr_debug("machine__process_event failed, event type %u\n",
295 static int process_events(struct machine *machine, struct perf_evlist *evlist,
298 union perf_event *event;
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);
312 static int comp(const void *a, const void *b)
314 return *(int *)a - *(int *)b;
317 static void do_sort_something(void)
321 for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
322 buf[i] = ARRAY_SIZE(buf) - i - 1;
324 qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
326 for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
328 pr_debug("qsort failed\n");
334 static void sort_something(void)
338 for (i = 0; i < 10; i++)
342 static void syscall_something(void)
347 for (i = 0; i < 1000; i++) {
348 if (pipe(pipefd) < 0) {
349 pr_debug("pipe failed\n");
357 static void fs_something(void)
359 const char *test_file_name = "temp-perf-code-reading-test-file--";
363 for (i = 0; i < 1000; i++) {
364 f = fopen(test_file_name, "w+");
367 unlink(test_file_name);
372 static void do_something(void)
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,
389 static int do_test_code_reading(bool try_kcore)
391 struct machines machines;
392 struct machine *machine;
393 struct thread *thread;
394 struct perf_record_opts opts = {
395 .mmap_pages = UINT_MAX,
396 .user_freq = UINT_MAX,
397 .user_interval = ULLONG_MAX,
403 struct state state = {
406 struct thread_map *threads = NULL;
407 struct cpu_map *cpus = NULL;
408 struct perf_evlist *evlist = NULL;
409 struct perf_evsel *evsel = NULL;
413 bool have_vmlinux, have_kcore, excl_kernel = false;
417 machines__init(&machines);
418 machine = &machines.host;
420 ret = machine__create_kernel_maps(machine);
422 pr_debug("machine__create_kernel_maps failed\n");
426 /* Force the use of kallsyms instead of vmlinux to try kcore */
428 symbol_conf.kallsyms_name = "/proc/kallsyms";
430 /* Load kernel map */
431 map = machine->vmlinux_maps[MAP__FUNCTION];
432 ret = map__load(map, NULL);
434 pr_debug("map__load failed\n");
437 have_vmlinux = dso__is_vmlinux(map->dso);
438 have_kcore = dso__is_kcore(map->dso);
440 /* 2nd time through we just try kcore */
441 if (try_kcore && !have_kcore)
442 return TEST_CODE_READING_NO_KCORE;
444 /* No point getting kernel events if there is no kernel object */
445 if (!have_vmlinux && !have_kcore)
448 threads = thread_map__new_by_tid(pid);
450 pr_debug("thread_map__new_by_tid failed\n");
454 ret = perf_event__synthesize_thread_map(NULL, threads,
455 perf_event__process, machine, false);
457 pr_debug("perf_event__synthesize_thread_map failed\n");
461 thread = machine__findnew_thread(machine, pid, pid);
463 pr_debug("machine__findnew_thread failed\n");
467 cpus = cpu_map__new(NULL);
469 pr_debug("cpu_map__new failed\n");
476 evlist = perf_evlist__new();
478 pr_debug("perf_evlist__new failed\n");
482 perf_evlist__set_maps(evlist, cpus, threads);
488 pr_debug("Parsing event '%s'\n", str);
489 ret = parse_events(evlist, str);
491 pr_debug("parse_events failed\n");
495 perf_evlist__config(evlist, &opts);
497 evsel = perf_evlist__first(evlist);
499 evsel->attr.comm = 1;
500 evsel->attr.disabled = 1;
501 evsel->attr.enable_on_exec = 0;
503 ret = perf_evlist__open(evlist);
507 perf_evlist__delete(evlist);
511 pr_debug("perf_evlist__open failed\n");
517 ret = perf_evlist__mmap(evlist, UINT_MAX, false);
519 pr_debug("perf_evlist__mmap failed\n");
523 perf_evlist__enable(evlist);
527 perf_evlist__disable(evlist);
529 ret = process_events(machine, evlist, &state);
533 if (!have_vmlinux && !have_kcore && !try_kcore)
534 err = TEST_CODE_READING_NO_KERNEL_OBJ;
535 else if (!have_vmlinux && !try_kcore)
536 err = TEST_CODE_READING_NO_VMLINUX;
537 else if (excl_kernel)
538 err = TEST_CODE_READING_NO_ACCESS;
540 err = TEST_CODE_READING_OK;
543 perf_evlist__munmap(evlist);
544 perf_evlist__close(evlist);
545 perf_evlist__delete(evlist);
548 cpu_map__delete(cpus);
550 thread_map__delete(threads);
551 machines__destroy_kernel_maps(&machines);
552 machine__delete_threads(machine);
553 machines__exit(&machines);
558 int test__code_reading(void)
562 ret = do_test_code_reading(false);
564 ret = do_test_code_reading(true);
567 case TEST_CODE_READING_OK:
569 case TEST_CODE_READING_NO_VMLINUX:
570 fprintf(stderr, " (no vmlinux)");
572 case TEST_CODE_READING_NO_KCORE:
573 fprintf(stderr, " (no kcore)");
575 case TEST_CODE_READING_NO_ACCESS:
576 fprintf(stderr, " (no access)");
578 case TEST_CODE_READING_NO_KERNEL_OBJ:
579 fprintf(stderr, " (no kernel obj)");