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_MAX)
279 return machine__process_event(machine, event, NULL);
284 static int process_events(struct machine *machine, struct perf_evlist *evlist,
287 union perf_event *event;
290 for (i = 0; i < evlist->nr_mmaps; i++) {
291 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
292 ret = process_event(machine, evlist, event, state);
293 perf_evlist__mmap_consume(evlist, i);
301 static int comp(const void *a, const void *b)
303 return *(int *)a - *(int *)b;
306 static void do_sort_something(void)
310 for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
311 buf[i] = ARRAY_SIZE(buf) - i - 1;
313 qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
315 for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
317 pr_debug("qsort failed\n");
323 static void sort_something(void)
327 for (i = 0; i < 10; i++)
331 static void syscall_something(void)
336 for (i = 0; i < 1000; i++) {
337 if (pipe(pipefd) < 0) {
338 pr_debug("pipe failed\n");
346 static void fs_something(void)
348 const char *test_file_name = "temp-perf-code-reading-test-file--";
352 for (i = 0; i < 1000; i++) {
353 f = fopen(test_file_name, "w+");
356 unlink(test_file_name);
361 static void do_something(void)
371 TEST_CODE_READING_OK,
372 TEST_CODE_READING_NO_VMLINUX,
373 TEST_CODE_READING_NO_KCORE,
374 TEST_CODE_READING_NO_ACCESS,
375 TEST_CODE_READING_NO_KERNEL_OBJ,
378 static int do_test_code_reading(bool try_kcore)
380 struct machines machines;
381 struct machine *machine;
382 struct thread *thread;
383 struct perf_record_opts opts = {
384 .mmap_pages = UINT_MAX,
385 .user_freq = UINT_MAX,
386 .user_interval = ULLONG_MAX,
392 struct state state = {
395 struct thread_map *threads = NULL;
396 struct cpu_map *cpus = NULL;
397 struct perf_evlist *evlist = NULL;
398 struct perf_evsel *evsel = NULL;
402 bool have_vmlinux, have_kcore, excl_kernel = false;
406 machines__init(&machines);
407 machine = &machines.host;
409 ret = machine__create_kernel_maps(machine);
411 pr_debug("machine__create_kernel_maps failed\n");
415 /* Force the use of kallsyms instead of vmlinux to try kcore */
417 symbol_conf.kallsyms_name = "/proc/kallsyms";
419 /* Load kernel map */
420 map = machine->vmlinux_maps[MAP__FUNCTION];
421 ret = map__load(map, NULL);
423 pr_debug("map__load failed\n");
426 have_vmlinux = dso__is_vmlinux(map->dso);
427 have_kcore = dso__is_kcore(map->dso);
429 /* 2nd time through we just try kcore */
430 if (try_kcore && !have_kcore)
431 return TEST_CODE_READING_NO_KCORE;
433 /* No point getting kernel events if there is no kernel object */
434 if (!have_vmlinux && !have_kcore)
437 threads = thread_map__new_by_tid(pid);
439 pr_debug("thread_map__new_by_tid failed\n");
443 ret = perf_event__synthesize_thread_map(NULL, threads,
444 perf_event__process, machine);
446 pr_debug("perf_event__synthesize_thread_map failed\n");
450 thread = machine__findnew_thread(machine, pid, pid);
452 pr_debug("machine__findnew_thread failed\n");
456 cpus = cpu_map__new(NULL);
458 pr_debug("cpu_map__new failed\n");
465 evlist = perf_evlist__new();
467 pr_debug("perf_evlist__new failed\n");
471 perf_evlist__set_maps(evlist, cpus, threads);
477 pr_debug("Parsing event '%s'\n", str);
478 ret = parse_events(evlist, str);
480 pr_debug("parse_events failed\n");
484 perf_evlist__config(evlist, &opts);
486 evsel = perf_evlist__first(evlist);
488 evsel->attr.comm = 1;
489 evsel->attr.disabled = 1;
490 evsel->attr.enable_on_exec = 0;
492 ret = perf_evlist__open(evlist);
496 perf_evlist__delete(evlist);
500 pr_debug("perf_evlist__open failed\n");
506 ret = perf_evlist__mmap(evlist, UINT_MAX, false);
508 pr_debug("perf_evlist__mmap failed\n");
512 perf_evlist__enable(evlist);
516 perf_evlist__disable(evlist);
518 ret = process_events(machine, evlist, &state);
522 if (!have_vmlinux && !have_kcore && !try_kcore)
523 err = TEST_CODE_READING_NO_KERNEL_OBJ;
524 else if (!have_vmlinux && !try_kcore)
525 err = TEST_CODE_READING_NO_VMLINUX;
526 else if (excl_kernel)
527 err = TEST_CODE_READING_NO_ACCESS;
529 err = TEST_CODE_READING_OK;
532 perf_evlist__munmap(evlist);
533 perf_evlist__close(evlist);
534 perf_evlist__delete(evlist);
537 cpu_map__delete(cpus);
539 thread_map__delete(threads);
540 machines__destroy_kernel_maps(&machines);
541 machine__delete_threads(machine);
542 machines__exit(&machines);
547 int test__code_reading(void)
551 ret = do_test_code_reading(false);
553 ret = do_test_code_reading(true);
556 case TEST_CODE_READING_OK:
558 case TEST_CODE_READING_NO_VMLINUX:
559 fprintf(stderr, " (no vmlinux)");
561 case TEST_CODE_READING_NO_KCORE:
562 fprintf(stderr, " (no kcore)");
564 case TEST_CODE_READING_NO_ACCESS:
565 fprintf(stderr, " (no access)");
567 case TEST_CODE_READING_NO_KERNEL_OBJ:
568 fprintf(stderr, " (no kernel obj)");