1 #include <linux/types.h>
8 #include "parse-events.h"
11 #include "thread_map.h"
27 static unsigned int hex(char c)
29 if (c >= '0' && c <= '9')
31 if (c >= 'a' && c <= 'f')
36 static size_t read_objdump_line(const char *line, size_t line_len, void *buf,
43 p = strchr(line, ':');
53 for (; i < line_len; i++) {
54 if (!isspace(line[i]))
57 /* Get 2 hex digits */
58 if (i >= line_len || !isxdigit(line[i]))
61 if (i >= line_len || !isxdigit(line[i]))
64 /* Followed by a space */
65 if (i < line_len && line[i] && !isspace(line[i]))
68 *(unsigned char *)buf = (hex(c1) << 4) | hex(c2);
72 /* return number of successfully read bytes */
76 static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
79 size_t line_len, off_last = 0;
82 u64 addr, last_addr = start_addr;
84 while (off_last < *len) {
85 size_t off, read_bytes, written_bytes;
86 unsigned char tmp[BUFSZ];
88 ret = getline(&line, &line_len, f);
92 pr_debug("getline failed\n");
97 /* read objdump data into temporary buffer */
98 read_bytes = read_objdump_line(line, ret, tmp, sizeof(tmp));
102 if (sscanf(line, "%"PRIx64, &addr) != 1)
104 if (addr < last_addr) {
105 pr_debug("addr going backwards, read beyond section?\n");
110 /* copy it from temporary buffer to 'buf' according
111 * to address on current objdump line */
112 off = addr - start_addr;
115 written_bytes = MIN(read_bytes, *len - off);
116 memcpy(buf + off, tmp, written_bytes);
117 off_last = off + written_bytes;
120 /* len returns number of bytes that could not be read */
128 static int read_via_objdump(const char *filename, u64 addr, void *buf,
131 char cmd[PATH_MAX * 2];
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,
139 if (ret <= 0 || (size_t)ret >= sizeof(cmd))
142 pr_debug("Objdump command is: %s\n", cmd);
144 /* Ignore objdump errors */
145 strcat(cmd, " 2>/dev/null");
149 pr_debug("popen failed\n");
153 ret = read_objdump_output(f, buf, &len, addr);
155 pr_debug("objdump read too few bytes\n");
165 static void dump_buf(unsigned char *buf, size_t len)
169 for (i = 0; i < len; i++) {
170 pr_debug("0x%02x ", buf[i]);
177 static int read_object_code(u64 addr, size_t len, u8 cpumode,
178 struct thread *thread, struct state *state)
180 struct addr_location al;
181 unsigned char buf1[BUFSZ];
182 unsigned char buf2[BUFSZ];
187 pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
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");
195 pr_debug("File is: %s\n", al.map->dso->long_name);
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");
203 pr_debug("On file address is: %#"PRIx64"\n", al.addr);
208 /* Do not go off the map */
209 if (addr + len > al.map->end)
210 len = al.map->end - addr;
212 /* Read the object code using perf */
213 ret_len = dso__data_read_offset(al.map->dso, thread->mg->machine,
215 if (ret_len != len) {
216 pr_debug("dso__data_read_offset failed\n");
221 * Converting addresses for use by objdump requires more information.
222 * map__load() does that. See map__rip_2objdump() for details.
224 if (map__load(al.map, NULL))
227 /* objdump struggles with kcore - try each map only once */
228 if (dso__is_kcore(al.map->dso)) {
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");
238 if (state->done_cnt >= ARRAY_SIZE(state->done)) {
239 pr_debug("Too many kcore maps - skipping\n");
242 state->done[state->done_cnt++] = al.map->start;
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);
250 * The kernel maps are inaccurate - assume objdump is right in
253 if (cpumode == PERF_RECORD_MISC_KERNEL ||
254 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
257 pr_debug("Reducing len to %zu\n", len);
258 } else if (dso__is_kcore(al.map->dso)) {
260 * objdump cannot handle very large segments
261 * that may be found in kcore.
263 pr_debug("objdump failed for kcore");
264 pr_debug(" - skipping\n");
272 pr_debug("read_via_objdump failed\n");
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");
281 pr_debug("buf2 (objdump):\n");
285 pr_debug("Bytes read match those read by objdump\n");
290 static int process_sample_event(struct machine *machine,
291 struct perf_evlist *evlist,
292 union perf_event *event, struct state *state)
294 struct perf_sample sample;
295 struct thread *thread;
299 if (perf_evlist__parse_sample(evlist, event, &sample)) {
300 pr_debug("perf_evlist__parse_sample failed\n");
304 thread = machine__findnew_thread(machine, sample.pid, sample.tid);
306 pr_debug("machine__findnew_thread failed\n");
310 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
312 ret = read_object_code(sample.ip, READLEN, cpumode, thread, state);
317 static int process_event(struct machine *machine, struct perf_evlist *evlist,
318 union perf_event *event, struct state *state)
320 if (event->header.type == PERF_RECORD_SAMPLE)
321 return process_sample_event(machine, evlist, event, state);
323 if (event->header.type == PERF_RECORD_THROTTLE ||
324 event->header.type == PERF_RECORD_UNTHROTTLE)
327 if (event->header.type < PERF_RECORD_MAX) {
330 ret = machine__process_event(machine, event, NULL);
332 pr_debug("machine__process_event failed, event type %u\n",
340 static int process_events(struct machine *machine, struct perf_evlist *evlist,
343 union perf_event *event;
346 for (i = 0; i < evlist->nr_mmaps; i++) {
347 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
348 ret = process_event(machine, evlist, event, state);
349 perf_evlist__mmap_consume(evlist, i);
357 static int comp(const void *a, const void *b)
359 return *(int *)a - *(int *)b;
362 static void do_sort_something(void)
366 for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
367 buf[i] = ARRAY_SIZE(buf) - i - 1;
369 qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
371 for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
373 pr_debug("qsort failed\n");
379 static void sort_something(void)
383 for (i = 0; i < 10; i++)
387 static void syscall_something(void)
392 for (i = 0; i < 1000; i++) {
393 if (pipe(pipefd) < 0) {
394 pr_debug("pipe failed\n");
402 static void fs_something(void)
404 const char *test_file_name = "temp-perf-code-reading-test-file--";
408 for (i = 0; i < 1000; i++) {
409 f = fopen(test_file_name, "w+");
412 unlink(test_file_name);
417 static void do_something(void)
427 TEST_CODE_READING_OK,
428 TEST_CODE_READING_NO_VMLINUX,
429 TEST_CODE_READING_NO_KCORE,
430 TEST_CODE_READING_NO_ACCESS,
431 TEST_CODE_READING_NO_KERNEL_OBJ,
434 static int do_test_code_reading(bool try_kcore)
436 struct machine *machine;
437 struct thread *thread;
438 struct record_opts opts = {
439 .mmap_pages = UINT_MAX,
440 .user_freq = UINT_MAX,
441 .user_interval = ULLONG_MAX,
447 struct state state = {
450 struct thread_map *threads = NULL;
451 struct cpu_map *cpus = NULL;
452 struct perf_evlist *evlist = NULL;
453 struct perf_evsel *evsel = NULL;
457 bool have_vmlinux, have_kcore, excl_kernel = false;
461 machine = machine__new_host();
463 ret = machine__create_kernel_maps(machine);
465 pr_debug("machine__create_kernel_maps failed\n");
469 /* Force the use of kallsyms instead of vmlinux to try kcore */
471 symbol_conf.kallsyms_name = "/proc/kallsyms";
473 /* Load kernel map */
474 map = machine__kernel_map(machine);
475 ret = map__load(map, NULL);
477 pr_debug("map__load failed\n");
480 have_vmlinux = dso__is_vmlinux(map->dso);
481 have_kcore = dso__is_kcore(map->dso);
483 /* 2nd time through we just try kcore */
484 if (try_kcore && !have_kcore)
485 return TEST_CODE_READING_NO_KCORE;
487 /* No point getting kernel events if there is no kernel object */
488 if (!have_vmlinux && !have_kcore)
491 threads = thread_map__new_by_tid(pid);
493 pr_debug("thread_map__new_by_tid failed\n");
497 ret = perf_event__synthesize_thread_map(NULL, threads,
498 perf_event__process, machine, false, 500);
500 pr_debug("perf_event__synthesize_thread_map failed\n");
504 thread = machine__findnew_thread(machine, pid, pid);
506 pr_debug("machine__findnew_thread failed\n");
510 cpus = cpu_map__new(NULL);
512 pr_debug("cpu_map__new failed\n");
519 evlist = perf_evlist__new();
521 pr_debug("perf_evlist__new failed\n");
525 perf_evlist__set_maps(evlist, cpus, threads);
531 pr_debug("Parsing event '%s'\n", str);
532 ret = parse_events(evlist, str, NULL);
534 pr_debug("parse_events failed\n");
538 perf_evlist__config(evlist, &opts);
540 evsel = perf_evlist__first(evlist);
542 evsel->attr.comm = 1;
543 evsel->attr.disabled = 1;
544 evsel->attr.enable_on_exec = 0;
546 ret = perf_evlist__open(evlist);
551 * Both cpus and threads are now owned by evlist
552 * and will be freed by following perf_evlist__set_maps
553 * call. Getting refference to keep them alive.
556 thread_map__get(threads);
557 perf_evlist__set_maps(evlist, NULL, NULL);
558 perf_evlist__delete(evlist);
562 pr_debug("perf_evlist__open failed\n");
568 ret = perf_evlist__mmap(evlist, UINT_MAX, false);
570 pr_debug("perf_evlist__mmap failed\n");
574 perf_evlist__enable(evlist);
578 perf_evlist__disable(evlist);
580 ret = process_events(machine, evlist, &state);
584 if (!have_vmlinux && !have_kcore && !try_kcore)
585 err = TEST_CODE_READING_NO_KERNEL_OBJ;
586 else if (!have_vmlinux && !try_kcore)
587 err = TEST_CODE_READING_NO_VMLINUX;
588 else if (excl_kernel)
589 err = TEST_CODE_READING_NO_ACCESS;
591 err = TEST_CODE_READING_OK;
597 perf_evlist__delete(evlist);
600 thread_map__put(threads);
602 machine__delete_threads(machine);
603 machine__delete(machine);
608 int test__code_reading(int subtest __maybe_unused)
612 ret = do_test_code_reading(false);
614 ret = do_test_code_reading(true);
617 case TEST_CODE_READING_OK:
619 case TEST_CODE_READING_NO_VMLINUX:
620 pr_debug("no vmlinux\n");
622 case TEST_CODE_READING_NO_KCORE:
623 pr_debug("no kcore\n");
625 case TEST_CODE_READING_NO_ACCESS:
626 pr_debug("no access\n");
628 case TEST_CODE_READING_NO_KERNEL_OBJ:
629 pr_debug("no kernel obj\n");