code-reading.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <errno.h>
  3#include <linux/kconfig.h>
  4#include <linux/kernel.h>
  5#include <linux/rbtree.h>
  6#include <linux/types.h>
  7#include <inttypes.h>
  8#include <stdlib.h>
  9#include <unistd.h>
 10#include <stdio.h>
 11#include <string.h>
 12#include <sys/param.h>
 13#include <sys/utsname.h>
 14#include <perf/cpumap.h>
 15#include <perf/evlist.h>
 16#include <perf/mmap.h>
 17
 18#include "debug.h"
 19#include "dso.h"
 20#include "env.h"
 21#include "parse-events.h"
 22#include "evlist.h"
 23#include "evsel.h"
 24#include "thread_map.h"
 25#include "machine.h"
 26#include "map.h"
 27#include "symbol.h"
 28#include "event.h"
 29#include "record.h"
 30#include "util/mmap.h"
 31#include "util/string2.h"
 32#include "util/synthetic-events.h"
 33#include "util/util.h"
 34#include "thread.h"
 35
 36#include "tests.h"
 37
 38#include <linux/ctype.h>
 39
 40#define BUFSZ	1024
 41#define READLEN	128
 42
 43struct tested_section {
 44	struct rb_node rb_node;
 45	u64 addr;
 46	char *path;
 47};
 48
 49static bool tested_code_insert_or_exists(const char *path, u64 addr,
 50					 struct rb_root *tested_sections)
 51{
 52	struct rb_node **node = &tested_sections->rb_node;
 53	struct rb_node *parent = NULL;
 54	struct tested_section *data;
 55
 56	while (*node) {
 57		int cmp;
 58
 59		parent = *node;
 60		data = rb_entry(*node, struct tested_section, rb_node);
 61		cmp = strcmp(path, data->path);
 62		if (!cmp) {
 63			if (addr < data->addr)
 64				cmp = -1;
 65			else if (addr > data->addr)
 66				cmp = 1;
 67			else
 68				return true; /* already tested */
 69		}
 70
 71		if (cmp < 0)
 72			node = &(*node)->rb_left;
 73		else
 74			node = &(*node)->rb_right;
 75	}
 76
 77	data = zalloc(sizeof(*data));
 78	if (!data)
 79		return true;
 80
 81	data->addr = addr;
 82	data->path = strdup(path);
 83	if (!data->path) {
 84		free(data);
 85		return true;
 86	}
 87	rb_link_node(&data->rb_node, parent, node);
 88	rb_insert_color(&data->rb_node, tested_sections);
 89	return false;
 90}
 91
 92static void tested_sections__free(struct rb_root *root)
 93{
 94	while (!RB_EMPTY_ROOT(root)) {
 95		struct rb_node *node = rb_first(root);
 96		struct tested_section *ts = rb_entry(node,
 97						     struct tested_section,
 98						     rb_node);
 99
100		rb_erase(node, root);
101		free(ts->path);
102		free(ts);
103	}
104}
105
106static size_t read_objdump_chunk(const char **line, unsigned char **buf,
107				 size_t *buf_len)
108{
109	size_t bytes_read = 0;
110	unsigned char *chunk_start = *buf;
111
112	/* Read bytes */
113	while (*buf_len > 0) {
114		char c1, c2;
115
116		/* Get 2 hex digits */
117		c1 = *(*line)++;
118		if (!isxdigit(c1))
119			break;
120		c2 = *(*line)++;
121		if (!isxdigit(c2))
122			break;
123
124		/* Store byte and advance buf */
125		**buf = (hex(c1) << 4) | hex(c2);
126		(*buf)++;
127		(*buf_len)--;
128		bytes_read++;
129
130		/* End of chunk? */
131		if (isspace(**line))
132			break;
133	}
134
135	/*
136	 * objdump will display raw insn as LE if code endian
137	 * is LE and bytes_per_chunk > 1. In that case reverse
138	 * the chunk we just read.
139	 *
140	 * see disassemble_bytes() at binutils/objdump.c for details
141	 * how objdump chooses display endian)
142	 */
143	if (bytes_read > 1 && !host_is_bigendian()) {
144		unsigned char *chunk_end = chunk_start + bytes_read - 1;
145		unsigned char tmp;
146
147		while (chunk_start < chunk_end) {
148			tmp = *chunk_start;
149			*chunk_start = *chunk_end;
150			*chunk_end = tmp;
151			chunk_start++;
152			chunk_end--;
153		}
154	}
155
156	return bytes_read;
157}
158
159static size_t read_objdump_line(const char *line, unsigned char *buf,
160				size_t buf_len)
161{
162	const char *p;
163	size_t ret, bytes_read = 0;
164
165	/* Skip to a colon */
166	p = strchr(line, ':');
167	if (!p)
168		return 0;
169	p++;
170
171	/* Skip initial spaces */
172	while (*p) {
173		if (!isspace(*p))
174			break;
175		p++;
176	}
177
178	do {
179		ret = read_objdump_chunk(&p, &buf, &buf_len);
180		bytes_read += ret;
181		p++;
182	} while (ret > 0);
183
184	/* return number of successfully read bytes */
185	return bytes_read;
186}
187
188static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
189{
190	char *line = NULL;
191	size_t line_len, off_last = 0;
192	ssize_t ret;
193	int err = 0;
194	u64 addr, last_addr = start_addr;
195
196	while (off_last < *len) {
197		size_t off, read_bytes, written_bytes;
198		unsigned char tmp[BUFSZ];
199
200		ret = getline(&line, &line_len, f);
201		if (feof(f))
202			break;
203		if (ret < 0) {
204			pr_debug("getline failed\n");
205			err = -1;
206			break;
207		}
208
209		/* read objdump data into temporary buffer */
210		read_bytes = read_objdump_line(line, tmp, sizeof(tmp));
211		if (!read_bytes)
212			continue;
213
214		if (sscanf(line, "%"PRIx64, &addr) != 1)
215			continue;
216		if (addr < last_addr) {
217			pr_debug("addr going backwards, read beyond section?\n");
218			break;
219		}
220		last_addr = addr;
221
222		/* copy it from temporary buffer to 'buf' according
223		 * to address on current objdump line */
224		off = addr - start_addr;
225		if (off >= *len)
226			break;
227		written_bytes = MIN(read_bytes, *len - off);
228		memcpy(buf + off, tmp, written_bytes);
229		off_last = off + written_bytes;
230	}
231
232	/* len returns number of bytes that could not be read */
233	*len -= off_last;
234
235	free(line);
236
237	return err;
238}
239
240/*
241 * Only gets GNU objdump version. Returns 0 for llvm-objdump.
242 */
243static int objdump_version(void)
244{
245	size_t line_len;
246	char cmd[PATH_MAX * 2];
247	char *line = NULL;
248	const char *fmt;
249	FILE *f;
250	int ret;
251
252	int version_tmp, version_num = 0;
253	char *version = 0, *token;
254
255	fmt = "%s --version";
256	ret = snprintf(cmd, sizeof(cmd), fmt, test_objdump_path);
257	if (ret <= 0 || (size_t)ret >= sizeof(cmd))
258		return -1;
259	/* Ignore objdump errors */
260	strcat(cmd, " 2>/dev/null");
261	f = popen(cmd, "r");
262	if (!f) {
263		pr_debug("popen failed\n");
264		return -1;
265	}
266	/* Get first line of objdump --version output */
267	ret = getline(&line, &line_len, f);
268	pclose(f);
269	if (ret < 0) {
270		pr_debug("getline failed\n");
271		return -1;
272	}
273
274	token = strsep(&line, " ");
275	if (token != NULL && !strcmp(token, "GNU")) {
276		// version is last part of first line of objdump --version output.
277		while ((token = strsep(&line, " ")))
278			version = token;
279
280		// Convert version into a format we can compare with
281		token = strsep(&version, ".");
282		version_num = atoi(token);
283		if (version_num)
284			version_num *= 10000;
285
286		token = strsep(&version, ".");
287		version_tmp = atoi(token);
288		if (token)
289			version_num += version_tmp * 100;
290
291		token = strsep(&version, ".");
292		version_tmp = atoi(token);
293		if (token)
294			version_num += version_tmp;
295	}
296
297	return version_num;
298}
299
300static int read_via_objdump(const char *filename, u64 addr, void *buf,
301			    size_t len)
302{
303	u64 stop_address = addr + len;
304	struct utsname uname_buf;
305	char cmd[PATH_MAX * 2];
306	const char *fmt;
307	FILE *f;
308	int ret;
309
310	ret = uname(&uname_buf);
311	if (ret) {
312		pr_debug("uname failed\n");
313		return -1;
314	}
315
316	if (!strncmp(uname_buf.machine, "riscv", 5)) {
317		int version = objdump_version();
318
319		/* Default to this workaround if version parsing fails */
320		if (version < 0 || version > 24100) {
321			/*
322			 * Starting at riscv objdump version 2.41, dumping in
323			 * the middle of an instruction is not supported. riscv
324			 * instructions are aligned along 2-byte intervals and
325			 * can be either 2-bytes or 4-bytes. This makes it
326			 * possible that the stop-address lands in the middle of
327			 * a 4-byte instruction. Increase the stop_address by
328			 * two to ensure an instruction is not cut in half, but
329			 * leave the len as-is so only the expected number of
330			 * bytes are collected.
331			 */
332			stop_address += 2;
333		}
334	}
335
336	fmt = "%s -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
337	ret = snprintf(cmd, sizeof(cmd), fmt, test_objdump_path, addr, stop_address,
338		       filename);
339	if (ret <= 0 || (size_t)ret >= sizeof(cmd))
340		return -1;
341
342	pr_debug("Objdump command is: %s\n", cmd);
343
344	/* Ignore objdump errors */
345	strcat(cmd, " 2>/dev/null");
346
347	f = popen(cmd, "r");
348	if (!f) {
349		pr_debug("popen failed\n");
350		return -1;
351	}
352
353	ret = read_objdump_output(f, buf, &len, addr);
354	if (len) {
355		pr_debug("objdump read too few bytes: %zd\n", len);
356		if (!ret)
357			ret = len;
358	}
359
360	pclose(f);
361
362	return ret;
363}
364
365static void dump_buf(unsigned char *buf, size_t len)
366{
367	size_t i;
368
369	for (i = 0; i < len; i++) {
370		pr_debug("0x%02x ", buf[i]);
371		if (i % 16 == 15)
372			pr_debug("\n");
373	}
374	pr_debug("\n");
375}
376
377static int read_object_code(u64 addr, size_t len, u8 cpumode,
378			    struct thread *thread,
379			    struct rb_root *tested_sections)
380{
381	struct addr_location al;
382	unsigned char buf1[BUFSZ] = {0};
383	unsigned char buf2[BUFSZ] = {0};
384	size_t ret_len;
385	u64 objdump_addr;
386	u64 skip_addr;
387	const char *objdump_name;
388	char decomp_name[KMOD_DECOMP_LEN];
389	bool decomp = false;
390	int ret, err = 0;
391	struct dso *dso;
392
393	pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
394
395	addr_location__init(&al);
396	if (!thread__find_map(thread, cpumode, addr, &al) || !map__dso(al.map)) {
397		if (cpumode == PERF_RECORD_MISC_HYPERVISOR) {
398			pr_debug("Hypervisor address can not be resolved - skipping\n");
399			goto out;
400		}
401
402		pr_debug("thread__find_map failed\n");
403		err = -1;
404		goto out;
405	}
406	dso = map__dso(al.map);
407	pr_debug("File is: %s\n", dso__long_name(dso));
408
409	if (dso__symtab_type(dso) == DSO_BINARY_TYPE__KALLSYMS && !dso__is_kcore(dso)) {
410		pr_debug("Unexpected kernel address - skipping\n");
411		goto out;
412	}
413
414	/*
415	 * Don't retest the same addresses. objdump struggles with kcore - try
416	 * each map only once even if the address is different.
417	 */
418	skip_addr = dso__is_kcore(dso) ? map__start(al.map) : al.addr;
419	if (tested_code_insert_or_exists(dso__long_name(dso), skip_addr,
420					 tested_sections)) {
421		pr_debug("Already tested %s @ %#"PRIx64" - skipping\n",
422			 dso__long_name(dso), skip_addr);
423		goto out;
424	}
425
426	pr_debug("On file address is: %#"PRIx64"\n", al.addr);
427
428	if (len > BUFSZ)
429		len = BUFSZ;
430
431	/* Do not go off the map */
432	if (addr + len > map__end(al.map))
433		len = map__end(al.map) - addr;
434
435	/*
436	 * Some architectures (ex: powerpc) have stubs (trampolines) in kernel
437	 * modules to manage long jumps. Check if the ip offset falls in stubs
438	 * sections for kernel modules. And skip module address after text end
439	 */
440	if (dso__is_kmod(dso) && al.addr > dso__text_end(dso)) {
441		pr_debug("skipping the module address %#"PRIx64" after text end\n", al.addr);
442		goto out;
443	}
444
445	/* Read the object code using perf */
446	ret_len = dso__data_read_offset(dso, maps__machine(thread__maps(thread)),
447					al.addr, buf1, len);
448	if (ret_len != len) {
449		pr_debug("dso__data_read_offset failed\n");
450		err = -1;
451		goto out;
452	}
453
454	/*
455	 * Converting addresses for use by objdump requires more information.
456	 * map__load() does that.  See map__rip_2objdump() for details.
457	 */
458	if (map__load(al.map)) {
459		err = -1;
460		goto out;
461	}
462
463	objdump_name = dso__long_name(dso);
464	if (dso__needs_decompress(dso)) {
465		if (dso__decompress_kmodule_path(dso, objdump_name,
466						 decomp_name,
467						 sizeof(decomp_name)) < 0) {
468			pr_debug("decompression failed\n");
469			err = -1;
470			goto out;
471		}
472
473		decomp = true;
474		objdump_name = decomp_name;
475	}
476
477	/* Read the object code using objdump */
478	objdump_addr = map__rip_2objdump(al.map, al.addr);
479	ret = read_via_objdump(objdump_name, objdump_addr, buf2, len);
480
481	if (decomp)
482		unlink(objdump_name);
483
484	if (ret > 0) {
485		/*
486		 * The kernel maps are inaccurate - assume objdump is right in
487		 * that case.
488		 */
489		if (cpumode == PERF_RECORD_MISC_KERNEL ||
490		    cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
491			len -= ret;
492			if (len) {
493				pr_debug("Reducing len to %zu\n", len);
494			} else if (dso__is_kcore(dso)) {
495				/*
496				 * objdump cannot handle very large segments
497				 * that may be found in kcore.
498				 */
499				pr_debug("objdump failed for kcore");
500				pr_debug(" - skipping\n");
501			} else {
502				err = -1;
503			}
504			goto out;
505		}
506	}
507	if (ret < 0) {
508		pr_debug("read_via_objdump failed\n");
509		err = -1;
510		goto out;
511	}
512
513	/* The results should be identical */
514	if (memcmp(buf1, buf2, len)) {
515		pr_debug("Bytes read differ from those read by objdump\n");
516		pr_debug("buf1 (dso):\n");
517		dump_buf(buf1, len);
518		pr_debug("buf2 (objdump):\n");
519		dump_buf(buf2, len);
520		err = -1;
521		goto out;
522	}
523	pr_debug("Bytes read match those read by objdump\n");
524out:
525	addr_location__exit(&al);
526	return err;
527}
528
529static int process_sample_event(struct machine *machine, struct evlist *evlist,
530				union perf_event *event,
531				struct rb_root *tested_sections)
532{
533	struct perf_sample sample;
534	struct thread *thread;
535	int ret;
536
537	perf_sample__init(&sample, /*all=*/false);
538	ret = evlist__parse_sample(evlist, event, &sample);
539	if (ret) {
540		pr_debug("evlist__parse_sample failed\n");
541		ret = -1;
542		goto out;
543	}
544
545	thread = machine__findnew_thread(machine, sample.pid, sample.tid);
546	if (!thread) {
547		pr_debug("machine__findnew_thread failed\n");
548		ret = -1;
549		goto out;
550	}
551
552	ret = read_object_code(sample.ip, READLEN, sample.cpumode, thread,
553			       tested_sections);
554	thread__put(thread);
555out:
556	perf_sample__exit(&sample);
557	return ret;
558}
559
560static int process_event(struct machine *machine, struct evlist *evlist,
561			 union perf_event *event, struct rb_root *tested_sections)
562{
563	if (event->header.type == PERF_RECORD_SAMPLE)
564		return process_sample_event(machine, evlist, event,
565					    tested_sections);
566
567	if (event->header.type == PERF_RECORD_THROTTLE ||
568	    event->header.type == PERF_RECORD_UNTHROTTLE)
569		return 0;
570
571	if (event->header.type < PERF_RECORD_MAX) {
572		int ret;
573
574		ret = machine__process_event(machine, event, NULL);
575		if (ret < 0)
576			pr_debug("machine__process_event failed, event type %u\n",
577				 event->header.type);
578		return ret;
579	}
580
581	return 0;
582}
583
584static int process_events(struct machine *machine, struct evlist *evlist,
585			  struct rb_root *tested_sections)
586{
587	union perf_event *event;
588	struct mmap *md;
589	int i, ret;
590
591	for (i = 0; i < evlist->core.nr_mmaps; i++) {
592		md = &evlist->mmap[i];
593		if (perf_mmap__read_init(&md->core) < 0)
594			continue;
595
596		while ((event = perf_mmap__read_event(&md->core)) != NULL) {
597			ret = process_event(machine, evlist, event, tested_sections);
598			perf_mmap__consume(&md->core);
599			if (ret < 0)
600				return ret;
601		}
602		perf_mmap__read_done(&md->core);
603	}
604	return 0;
605}
606
607static int comp(const void *a, const void *b)
608{
609	return *(int *)a - *(int *)b;
610}
611
612static void do_sort_something(void)
613{
614	int buf[40960], i;
615
616	for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
617		buf[i] = ARRAY_SIZE(buf) - i - 1;
618
619	qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
620
621	for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
622		if (buf[i] != i) {
623			pr_debug("qsort failed\n");
624			break;
625		}
626	}
627}
628
629static void sort_something(void)
630{
631	int i;
632
633	for (i = 0; i < 10; i++)
634		do_sort_something();
635}
636
637static void syscall_something(void)
638{
639	int pipefd[2];
640	int i;
641
642	for (i = 0; i < 1000; i++) {
643		if (pipe(pipefd) < 0) {
644			pr_debug("pipe failed\n");
645			break;
646		}
647		close(pipefd[1]);
648		close(pipefd[0]);
649	}
650}
651
652static void fs_something(void)
653{
654	const char *test_file_name = "temp-perf-code-reading-test-file--";
655	FILE *f;
656	int i;
657
658	for (i = 0; i < 1000; i++) {
659		f = fopen(test_file_name, "w+");
660		if (f) {
661			fclose(f);
662			unlink(test_file_name);
663		}
664	}
665}
666
667static void do_something(void)
668{
669	fs_something();
670
671	sort_something();
672
673	syscall_something();
674}
675
676enum {
677	TEST_CODE_READING_OK,
678	TEST_CODE_READING_NO_VMLINUX,
679	TEST_CODE_READING_NO_KCORE,
680	TEST_CODE_READING_NO_ACCESS,
681	TEST_CODE_READING_NO_KERNEL_OBJ,
682};
683
684static int do_test_code_reading(bool try_kcore)
685{
686	struct machine *machine;
687	struct thread *thread;
688	struct record_opts opts = {
689		.mmap_pages	     = UINT_MAX,
690		.user_freq	     = UINT_MAX,
691		.user_interval	     = ULLONG_MAX,
692		.freq		     = 500,
693		.target		     = {
694			.uses_mmap   = true,
695		},
696	};
697	struct rb_root tested_sections = RB_ROOT;
698	struct perf_thread_map *threads = NULL;
699	struct perf_cpu_map *cpus = NULL;
700	struct evlist *evlist = NULL;
701	struct evsel *evsel = NULL;
702	int err = -1, ret;
703	pid_t pid;
704	struct map *map;
705	bool have_vmlinux, have_kcore;
706	struct dso *dso;
707	const char *events[] = { "cpu-cycles", "cpu-cycles:u", "cpu-clock", "cpu-clock:u", NULL };
708	int evidx = 0;
709	struct perf_env host_env;
710
711	pid = getpid();
712
713	perf_env__init(&host_env);
714	machine = machine__new_host(&host_env);
715
716	ret = machine__create_kernel_maps(machine);
717	if (ret < 0) {
718		pr_debug("machine__create_kernel_maps failed\n");
719		goto out_err;
720	}
721
722	/* Force the use of kallsyms instead of vmlinux to try kcore */
723	if (try_kcore)
724		symbol_conf.kallsyms_name = "/proc/kallsyms";
725
726	/* Load kernel map */
727	map = machine__kernel_map(machine);
728	ret = map__load(map);
729	if (ret < 0) {
730		pr_debug("map__load failed\n");
731		goto out_err;
732	}
733	dso = map__dso(map);
734	have_vmlinux = dso__is_vmlinux(dso);
735	have_kcore = dso__is_kcore(dso);
736
737	/* 2nd time through we just try kcore */
738	if (try_kcore && !have_kcore)
739		return TEST_CODE_READING_NO_KCORE;
740
741	/* No point getting kernel events if there is no kernel object */
742	if (!have_vmlinux && !have_kcore)
743		evidx++;
744
745	threads = thread_map__new_by_tid(pid);
746	if (!threads) {
747		pr_debug("thread_map__new_by_tid failed\n");
748		goto out_err;
749	}
750
751	ret = perf_event__synthesize_thread_map(NULL, threads,
752						perf_event__process, machine,
753						true, false);
754	if (ret < 0) {
755		pr_debug("perf_event__synthesize_thread_map failed\n");
756		goto out_err;
757	}
758
759	thread = machine__findnew_thread(machine, pid, pid);
760	if (!thread) {
761		pr_debug("machine__findnew_thread failed\n");
762		goto out_put;
763	}
764
765	cpus = perf_cpu_map__new_online_cpus();
766	if (!cpus) {
767		pr_debug("perf_cpu_map__new failed\n");
768		goto out_put;
769	}
770
771	while (events[evidx]) {
772		const char *str;
773
774		evlist = evlist__new();
775		if (!evlist) {
776			pr_debug("evlist__new failed\n");
777			goto out_put;
778		}
779
780		perf_evlist__set_maps(&evlist->core, cpus, threads);
781
782		str = events[evidx];
783		pr_debug("Parsing event '%s'\n", str);
784		ret = parse_event(evlist, str);
785		if (ret < 0) {
786			pr_debug("parse_events failed\n");
787			goto out_put;
788		}
789
790		evlist__config(evlist, &opts, NULL);
791
792		evlist__for_each_entry(evlist, evsel) {
793			evsel->core.attr.comm = 1;
794			evsel->core.attr.disabled = 1;
795			evsel->core.attr.enable_on_exec = 0;
796		}
797
798		ret = evlist__open(evlist);
799		if (ret < 0) {
800			evidx++;
801
802			if (events[evidx] == NULL && verbose > 0) {
803				char errbuf[512];
804				evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
805				pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
806			}
807
808			perf_evlist__set_maps(&evlist->core, NULL, NULL);
809			evlist__delete(evlist);
810			evlist = NULL;
811			continue;
812		}
813		break;
814	}
815
816	if (events[evidx] == NULL)
817		goto out_put;
818
819	ret = evlist__mmap(evlist, UINT_MAX);
820	if (ret < 0) {
821		pr_debug("evlist__mmap failed\n");
822		goto out_put;
823	}
824
825	evlist__enable(evlist);
826
827	do_something();
828
829	evlist__disable(evlist);
830
831	ret = process_events(machine, evlist, &tested_sections);
832	if (ret < 0)
833		goto out_put;
834
835	if (!have_vmlinux && !have_kcore && !try_kcore)
836		err = TEST_CODE_READING_NO_KERNEL_OBJ;
837	else if (!have_vmlinux && !try_kcore)
838		err = TEST_CODE_READING_NO_VMLINUX;
839	else if (strstr(events[evidx], ":u"))
840		err = TEST_CODE_READING_NO_ACCESS;
841	else
842		err = TEST_CODE_READING_OK;
843out_put:
844	thread__put(thread);
845out_err:
846	evlist__delete(evlist);
847	perf_cpu_map__put(cpus);
848	perf_thread_map__put(threads);
849	machine__delete(machine);
850	perf_env__exit(&host_env);
851	tested_sections__free(&tested_sections);
852
853	return err;
854}
855
856static int test__code_reading(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
857{
858	int ret;
859
860	ret = do_test_code_reading(false);
861	if (!ret)
862		ret = do_test_code_reading(true);
863
864	switch (ret) {
865	case TEST_CODE_READING_OK:
866		return 0;
867	case TEST_CODE_READING_NO_VMLINUX:
868		pr_debug("no vmlinux\n");
869		return 0;
870	case TEST_CODE_READING_NO_KCORE:
871		pr_debug("no kcore\n");
872		return 0;
873	case TEST_CODE_READING_NO_ACCESS:
874		pr_debug("no access\n");
875		return 0;
876	case TEST_CODE_READING_NO_KERNEL_OBJ:
877		pr_debug("no kernel obj\n");
878		return 0;
879	default:
880		return -1;
881	};
882}
883
884DEFINE_SUITE("Object code reading", code_reading);