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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / tools / bpf / bpftool / btf.c
blobbcaf55b59498293064b46825929059e97d967ad1
1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2019 Facebook */
3
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <linux/err.h>
7 #include <stdbool.h>
8 #include <stdio.h>
9 #include <string.h>
10 #include <unistd.h>
11 #include <bpf/bpf.h>
12 #include <bpf/btf.h>
13 #include <bpf/libbpf.h>
14 #include <linux/btf.h>
15 #include <linux/hashtable.h>
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <unistd.h>
19
20 #include "json_writer.h"
21 #include "main.h"
22
23 static const char * const btf_kind_str[NR_BTF_KINDS] = {
24 [BTF_KIND_UNKN] = "UNKNOWN",
25 [BTF_KIND_INT] = "INT",
26 [BTF_KIND_PTR] = "PTR",
27 [BTF_KIND_ARRAY] = "ARRAY",
28 [BTF_KIND_STRUCT] = "STRUCT",
29 [BTF_KIND_UNION] = "UNION",
30 [BTF_KIND_ENUM] = "ENUM",
31 [BTF_KIND_FWD] = "FWD",
32 [BTF_KIND_TYPEDEF] = "TYPEDEF",
33 [BTF_KIND_VOLATILE] = "VOLATILE",
34 [BTF_KIND_CONST] = "CONST",
35 [BTF_KIND_RESTRICT] = "RESTRICT",
36 [BTF_KIND_FUNC] = "FUNC",
37 [BTF_KIND_FUNC_PROTO] = "FUNC_PROTO",
38 [BTF_KIND_VAR] = "VAR",
39 [BTF_KIND_DATASEC] = "DATASEC",
40 };
41
42 struct btf_attach_table {
43 DECLARE_HASHTABLE(table, 16);
44 };
45
46 struct btf_attach_point {
47 __u32 obj_id;
48 __u32 btf_id;
49 struct hlist_node hash;
50 };
51
52 static const char *btf_int_enc_str(__u8 encoding)
53 {
54 switch (encoding) {
55 case 0:
56 return "(none)";
57 case BTF_INT_SIGNED:
58 return "SIGNED";
59 case BTF_INT_CHAR:
60 return "CHAR";
61 case BTF_INT_BOOL:
62 return "BOOL";
63 default:
64 return "UNKN";
65 }
66 }
67
68 static const char *btf_var_linkage_str(__u32 linkage)
69 {
70 switch (linkage) {
71 case BTF_VAR_STATIC:
72 return "static";
73 case BTF_VAR_GLOBAL_ALLOCATED:
74 return "global-alloc";
75 default:
76 return "(unknown)";
77 }
78 }
79
80 static const char *btf_func_linkage_str(const struct btf_type *t)
81 {
82 switch (btf_vlen(t)) {
83 case BTF_FUNC_STATIC:
84 return "static";
85 case BTF_FUNC_GLOBAL:
86 return "global";
87 case BTF_FUNC_EXTERN:
88 return "extern";
89 default:
90 return "(unknown)";
91 }
92 }
93
94 static const char *btf_str(const struct btf *btf, __u32 off)
95 {
96 if (!off)
97 return "(anon)";
98 return btf__name_by_offset(btf, off) ? : "(invalid)";
99 }
100
101 static int dump_btf_type(const struct btf *btf, __u32 id,
102 const struct btf_type *t)
103 {
104 json_writer_t *w = json_wtr;
105 int kind, safe_kind;
106
107 kind = BTF_INFO_KIND(t->info);
108 safe_kind = kind <= BTF_KIND_MAX ? kind : BTF_KIND_UNKN;
109
110 if (json_output) {
111 jsonw_start_object(w);
112 jsonw_uint_field(w, "id", id);
113 jsonw_string_field(w, "kind", btf_kind_str[safe_kind]);
114 jsonw_string_field(w, "name", btf_str(btf, t->name_off));
115 } else {
116 printf("[%u] %s '%s'", id, btf_kind_str[safe_kind],
117 btf_str(btf, t->name_off));
118 }
119
120 switch (BTF_INFO_KIND(t->info)) {
121 case BTF_KIND_INT: {
122 __u32 v = *(__u32 *)(t + 1);
123 const char *enc;
124
125 enc = btf_int_enc_str(BTF_INT_ENCODING(v));
126
127 if (json_output) {
128 jsonw_uint_field(w, "size", t->size);
129 jsonw_uint_field(w, "bits_offset", BTF_INT_OFFSET(v));
130 jsonw_uint_field(w, "nr_bits", BTF_INT_BITS(v));
131 jsonw_string_field(w, "encoding", enc);
132 } else {
133 printf(" size=%u bits_offset=%u nr_bits=%u encoding=%s",
134 t->size, BTF_INT_OFFSET(v), BTF_INT_BITS(v),
135 enc);
136 }
137 break;
138 }
139 case BTF_KIND_PTR:
140 case BTF_KIND_CONST:
141 case BTF_KIND_VOLATILE:
142 case BTF_KIND_RESTRICT:
143 case BTF_KIND_TYPEDEF:
144 if (json_output)
145 jsonw_uint_field(w, "type_id", t->type);
146 else
147 printf(" type_id=%u", t->type);
148 break;
149 case BTF_KIND_ARRAY: {
150 const struct btf_array *arr = (const void *)(t + 1);
151
152 if (json_output) {
153 jsonw_uint_field(w, "type_id", arr->type);
154 jsonw_uint_field(w, "index_type_id", arr->index_type);
155 jsonw_uint_field(w, "nr_elems", arr->nelems);
156 } else {
157 printf(" type_id=%u index_type_id=%u nr_elems=%u",
158 arr->type, arr->index_type, arr->nelems);
159 }
160 break;
161 }
162 case BTF_KIND_STRUCT:
163 case BTF_KIND_UNION: {
164 const struct btf_member *m = (const void *)(t + 1);
165 __u16 vlen = BTF_INFO_VLEN(t->info);
166 int i;
167
168 if (json_output) {
169 jsonw_uint_field(w, "size", t->size);
170 jsonw_uint_field(w, "vlen", vlen);
171 jsonw_name(w, "members");
172 jsonw_start_array(w);
173 } else {
174 printf(" size=%u vlen=%u", t->size, vlen);
175 }
176 for (i = 0; i < vlen; i++, m++) {
177 const char *name = btf_str(btf, m->name_off);
178 __u32 bit_off, bit_sz;
179
180 if (BTF_INFO_KFLAG(t->info)) {
181 bit_off = BTF_MEMBER_BIT_OFFSET(m->offset);
182 bit_sz = BTF_MEMBER_BITFIELD_SIZE(m->offset);
183 } else {
184 bit_off = m->offset;
185 bit_sz = 0;
186 }
187
188 if (json_output) {
189 jsonw_start_object(w);
190 jsonw_string_field(w, "name", name);
191 jsonw_uint_field(w, "type_id", m->type);
192 jsonw_uint_field(w, "bits_offset", bit_off);
193 if (bit_sz) {
194 jsonw_uint_field(w, "bitfield_size",
195 bit_sz);
196 }
197 jsonw_end_object(w);
198 } else {
199 printf("\n\t'%s' type_id=%u bits_offset=%u",
200 name, m->type, bit_off);
201 if (bit_sz)
202 printf(" bitfield_size=%u", bit_sz);
203 }
204 }
205 if (json_output)
206 jsonw_end_array(w);
207 break;
208 }
209 case BTF_KIND_ENUM: {
210 const struct btf_enum *v = (const void *)(t + 1);
211 __u16 vlen = BTF_INFO_VLEN(t->info);
212 int i;
213
214 if (json_output) {
215 jsonw_uint_field(w, "size", t->size);
216 jsonw_uint_field(w, "vlen", vlen);
217 jsonw_name(w, "values");
218 jsonw_start_array(w);
219 } else {
220 printf(" size=%u vlen=%u", t->size, vlen);
221 }
222 for (i = 0; i < vlen; i++, v++) {
223 const char *name = btf_str(btf, v->name_off);
224
225 if (json_output) {
226 jsonw_start_object(w);
227 jsonw_string_field(w, "name", name);
228 jsonw_uint_field(w, "val", v->val);
229 jsonw_end_object(w);
230 } else {
231 printf("\n\t'%s' val=%u", name, v->val);
232 }
233 }
234 if (json_output)
235 jsonw_end_array(w);
236 break;
237 }
238 case BTF_KIND_FWD: {
239 const char *fwd_kind = BTF_INFO_KFLAG(t->info) ? "union"
240 : "struct";
241
242 if (json_output)
243 jsonw_string_field(w, "fwd_kind", fwd_kind);
244 else
245 printf(" fwd_kind=%s", fwd_kind);
246 break;
247 }
248 case BTF_KIND_FUNC: {
249 const char *linkage = btf_func_linkage_str(t);
250
251 if (json_output) {
252 jsonw_uint_field(w, "type_id", t->type);
253 jsonw_string_field(w, "linkage", linkage);
254 } else {
255 printf(" type_id=%u linkage=%s", t->type, linkage);
256 }
257 break;
258 }
259 case BTF_KIND_FUNC_PROTO: {
260 const struct btf_param *p = (const void *)(t + 1);
261 __u16 vlen = BTF_INFO_VLEN(t->info);
262 int i;
263
264 if (json_output) {
265 jsonw_uint_field(w, "ret_type_id", t->type);
266 jsonw_uint_field(w, "vlen", vlen);
267 jsonw_name(w, "params");
268 jsonw_start_array(w);
269 } else {
270 printf(" ret_type_id=%u vlen=%u", t->type, vlen);
271 }
272 for (i = 0; i < vlen; i++, p++) {
273 const char *name = btf_str(btf, p->name_off);
274
275 if (json_output) {
276 jsonw_start_object(w);
277 jsonw_string_field(w, "name", name);
278 jsonw_uint_field(w, "type_id", p->type);
279 jsonw_end_object(w);
280 } else {
281 printf("\n\t'%s' type_id=%u", name, p->type);
282 }
283 }
284 if (json_output)
285 jsonw_end_array(w);
286 break;
287 }
288 case BTF_KIND_VAR: {
289 const struct btf_var *v = (const void *)(t + 1);
290 const char *linkage;
291
292 linkage = btf_var_linkage_str(v->linkage);
293
294 if (json_output) {
295 jsonw_uint_field(w, "type_id", t->type);
296 jsonw_string_field(w, "linkage", linkage);
297 } else {
298 printf(" type_id=%u, linkage=%s", t->type, linkage);
299 }
300 break;
301 }
302 case BTF_KIND_DATASEC: {
303 const struct btf_var_secinfo *v = (const void *)(t+1);
304 __u16 vlen = BTF_INFO_VLEN(t->info);
305 int i;
306
307 if (json_output) {
308 jsonw_uint_field(w, "size", t->size);
309 jsonw_uint_field(w, "vlen", vlen);
310 jsonw_name(w, "vars");
311 jsonw_start_array(w);
312 } else {
313 printf(" size=%u vlen=%u", t->size, vlen);
314 }
315 for (i = 0; i < vlen; i++, v++) {
316 if (json_output) {
317 jsonw_start_object(w);
318 jsonw_uint_field(w, "type_id", v->type);
319 jsonw_uint_field(w, "offset", v->offset);
320 jsonw_uint_field(w, "size", v->size);
321 jsonw_end_object(w);
322 } else {
323 printf("\n\ttype_id=%u offset=%u size=%u",
324 v->type, v->offset, v->size);
325 }
326 }
327 if (json_output)
328 jsonw_end_array(w);
329 break;
330 }
331 default:
332 break;
333 }
334
335 if (json_output)
336 jsonw_end_object(json_wtr);
337 else
338 printf("\n");
339
340 return 0;
341 }
342
343 static int dump_btf_raw(const struct btf *btf,
344 __u32 *root_type_ids, int root_type_cnt)
345 {
346 const struct btf_type *t;
347 int i;
348
349 if (json_output) {
350 jsonw_start_object(json_wtr);
351 jsonw_name(json_wtr, "types");
352 jsonw_start_array(json_wtr);
353 }
354
355 if (root_type_cnt) {
356 for (i = 0; i < root_type_cnt; i++) {
357 t = btf__type_by_id(btf, root_type_ids[i]);
358 dump_btf_type(btf, root_type_ids[i], t);
359 }
360 } else {
361 int cnt = btf__get_nr_types(btf);
362
363 for (i = 1; i <= cnt; i++) {
364 t = btf__type_by_id(btf, i);
365 dump_btf_type(btf, i, t);
366 }
367 }
368
369 if (json_output) {
370 jsonw_end_array(json_wtr);
371 jsonw_end_object(json_wtr);
372 }
373 return 0;
374 }
375
376 static void __printf(2, 0) btf_dump_printf(void *ctx,
377 const char *fmt, va_list args)
378 {
379 vfprintf(stdout, fmt, args);
380 }
381
382 static int dump_btf_c(const struct btf *btf,
383 __u32 *root_type_ids, int root_type_cnt)
384 {
385 struct btf_dump *d;
386 int err = 0, i;
387
388 d = btf_dump__new(btf, NULL, NULL, btf_dump_printf);
389 if (IS_ERR(d))
390 return PTR_ERR(d);
391
392 printf("#ifndef __VMLINUX_H__\n");
393 printf("#define __VMLINUX_H__\n");
394 printf("\n");
395 printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n");
396 printf("#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)\n");
397 printf("#endif\n\n");
398
399 if (root_type_cnt) {
400 for (i = 0; i < root_type_cnt; i++) {
401 err = btf_dump__dump_type(d, root_type_ids[i]);
402 if (err)
403 goto done;
404 }
405 } else {
406 int cnt = btf__get_nr_types(btf);
407
408 for (i = 1; i <= cnt; i++) {
409 err = btf_dump__dump_type(d, i);
410 if (err)
411 goto done;
412 }
413 }
414
415 printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n");
416 printf("#pragma clang attribute pop\n");
417 printf("#endif\n");
418 printf("\n");
419 printf("#endif /* __VMLINUX_H__ */\n");
420
421 done:
422 btf_dump__free(d);
423 return err;
424 }
425
426 static struct btf *btf__parse_raw(const char *file)
427 {
428 struct btf *btf;
429 struct stat st;
430 __u8 *buf;
431 FILE *f;
432
433 if (stat(file, &st))
434 return NULL;
435
436 f = fopen(file, "rb");
437 if (!f)
438 return NULL;
439
440 buf = malloc(st.st_size);
441 if (!buf) {
442 btf = ERR_PTR(-ENOMEM);
443 goto exit_close;
444 }
445
446 if ((size_t) st.st_size != fread(buf, 1, st.st_size, f)) {
447 btf = ERR_PTR(-EINVAL);
448 goto exit_free;
449 }
450
451 btf = btf__new(buf, st.st_size);
452
453 exit_free:
454 free(buf);
455 exit_close:
456 fclose(f);
457 return btf;
458 }
459
460 static bool is_btf_raw(const char *file)
461 {
462 __u16 magic = 0;
463 int fd, nb_read;
464
465 fd = open(file, O_RDONLY);
466 if (fd < 0)
467 return false;
468
469 nb_read = read(fd, &magic, sizeof(magic));
470 close(fd);
471 return nb_read == sizeof(magic) && magic == BTF_MAGIC;
472 }
473
474 static int do_dump(int argc, char **argv)
475 {
476 struct btf *btf = NULL;
477 __u32 root_type_ids[2];
478 int root_type_cnt = 0;
479 bool dump_c = false;
480 __u32 btf_id = -1;
481 const char *src;
482 int fd = -1;
483 int err;
484
485 if (!REQ_ARGS(2)) {
486 usage();
487 return -1;
488 }
489 src = GET_ARG();
490
491 if (is_prefix(src, "map")) {
492 struct bpf_map_info info = {};
493 __u32 len = sizeof(info);
494
495 if (!REQ_ARGS(2)) {
496 usage();
497 return -1;
498 }
499
500 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
501 if (fd < 0)
502 return -1;
503
504 btf_id = info.btf_id;
505 if (argc && is_prefix(*argv, "key")) {
506 root_type_ids[root_type_cnt++] = info.btf_key_type_id;
507 NEXT_ARG();
508 } else if (argc && is_prefix(*argv, "value")) {
509 root_type_ids[root_type_cnt++] = info.btf_value_type_id;
510 NEXT_ARG();
511 } else if (argc && is_prefix(*argv, "all")) {
512 NEXT_ARG();
513 } else if (argc && is_prefix(*argv, "kv")) {
514 root_type_ids[root_type_cnt++] = info.btf_key_type_id;
515 root_type_ids[root_type_cnt++] = info.btf_value_type_id;
516 NEXT_ARG();
517 } else {
518 root_type_ids[root_type_cnt++] = info.btf_key_type_id;
519 root_type_ids[root_type_cnt++] = info.btf_value_type_id;
520 }
521 } else if (is_prefix(src, "prog")) {
522 struct bpf_prog_info info = {};
523 __u32 len = sizeof(info);
524
525 if (!REQ_ARGS(2)) {
526 usage();
527 return -1;
528 }
529
530 fd = prog_parse_fd(&argc, &argv);
531 if (fd < 0)
532 return -1;
533
534 err = bpf_obj_get_info_by_fd(fd, &info, &len);
535 if (err) {
536 p_err("can't get prog info: %s", strerror(errno));
537 goto done;
538 }
539
540 btf_id = info.btf_id;
541 } else if (is_prefix(src, "id")) {
542 char *endptr;
543
544 btf_id = strtoul(*argv, &endptr, 0);
545 if (*endptr) {
546 p_err("can't parse %s as ID", *argv);
547 return -1;
548 }
549 NEXT_ARG();
550 } else if (is_prefix(src, "file")) {
551 if (is_btf_raw(*argv))
552 btf = btf__parse_raw(*argv);
553 else
554 btf = btf__parse_elf(*argv, NULL);
555
556 if (IS_ERR(btf)) {
557 err = PTR_ERR(btf);
558 btf = NULL;
559 p_err("failed to load BTF from %s: %s",
560 *argv, strerror(err));
561 goto done;
562 }
563 NEXT_ARG();
564 } else {
565 err = -1;
566 p_err("unrecognized BTF source specifier: '%s'", src);
567 goto done;
568 }
569
570 while (argc) {
571 if (is_prefix(*argv, "format")) {
572 NEXT_ARG();
573 if (argc < 1) {
574 p_err("expecting value for 'format' option\n");
575 goto done;
576 }
577 if (strcmp(*argv, "c") == 0) {
578 dump_c = true;
579 } else if (strcmp(*argv, "raw") == 0) {
580 dump_c = false;
581 } else {
582 p_err("unrecognized format specifier: '%s', possible values: raw, c",
583 *argv);
584 goto done;
585 }
586 NEXT_ARG();
587 } else {
588 p_err("unrecognized option: '%s'", *argv);
589 goto done;
590 }
591 }
592
593 if (!btf) {
594 err = btf__get_from_id(btf_id, &btf);
595 if (err) {
596 p_err("get btf by id (%u): %s", btf_id, strerror(err));
597 goto done;
598 }
599 if (!btf) {
600 err = ENOENT;
601 p_err("can't find btf with ID (%u)", btf_id);
602 goto done;
603 }
604 }
605
606 if (dump_c) {
607 if (json_output) {
608 p_err("JSON output for C-syntax dump is not supported");
609 err = -ENOTSUP;
610 goto done;
611 }
612 err = dump_btf_c(btf, root_type_ids, root_type_cnt);
613 } else {
614 err = dump_btf_raw(btf, root_type_ids, root_type_cnt);
615 }
616
617 done:
618 close(fd);
619 btf__free(btf);
620 return err;
621 }
622
623 static int btf_parse_fd(int *argc, char ***argv)
624 {
625 unsigned int id;
626 char *endptr;
627 int fd;
628
629 if (!is_prefix(*argv[0], "id")) {
630 p_err("expected 'id', got: '%s'?", **argv);
631 return -1;
632 }
633 NEXT_ARGP();
634
635 id = strtoul(**argv, &endptr, 0);
636 if (*endptr) {
637 p_err("can't parse %s as ID", **argv);
638 return -1;
639 }
640 NEXT_ARGP();
641
642 fd = bpf_btf_get_fd_by_id(id);
643 if (fd < 0)
644 p_err("can't get BTF object by id (%u): %s",
645 id, strerror(errno));
646
647 return fd;
648 }
649
650 static void delete_btf_table(struct btf_attach_table *tab)
651 {
652 struct btf_attach_point *obj;
653 struct hlist_node *tmp;
654
655 unsigned int bkt;
656
657 hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
658 hash_del(&obj->hash);
659 free(obj);
660 }
661 }
662
663 static int
664 build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type,
665 void *info, __u32 *len)
666 {
667 static const char * const names[] = {
668 [BPF_OBJ_UNKNOWN] = "unknown",
669 [BPF_OBJ_PROG] = "prog",
670 [BPF_OBJ_MAP] = "map",
671 };
672 struct btf_attach_point *obj_node;
673 __u32 btf_id, id = 0;
674 int err;
675 int fd;
676
677 while (true) {
678 switch (type) {
679 case BPF_OBJ_PROG:
680 err = bpf_prog_get_next_id(id, &id);
681 break;
682 case BPF_OBJ_MAP:
683 err = bpf_map_get_next_id(id, &id);
684 break;
685 default:
686 err = -1;
687 p_err("unexpected object type: %d", type);
688 goto err_free;
689 }
690 if (err) {
691 if (errno == ENOENT) {
692 err = 0;
693 break;
694 }
695 p_err("can't get next %s: %s%s", names[type],
696 strerror(errno),
697 errno == EINVAL ? " -- kernel too old?" : "");
698 goto err_free;
699 }
700
701 switch (type) {
702 case BPF_OBJ_PROG:
703 fd = bpf_prog_get_fd_by_id(id);
704 break;
705 case BPF_OBJ_MAP:
706 fd = bpf_map_get_fd_by_id(id);
707 break;
708 default:
709 err = -1;
710 p_err("unexpected object type: %d", type);
711 goto err_free;
712 }
713 if (fd < 0) {
714 if (errno == ENOENT)
715 continue;
716 p_err("can't get %s by id (%u): %s", names[type], id,
717 strerror(errno));
718 err = -1;
719 goto err_free;
720 }
721
722 memset(info, 0, *len);
723 err = bpf_obj_get_info_by_fd(fd, info, len);
724 close(fd);
725 if (err) {
726 p_err("can't get %s info: %s", names[type],
727 strerror(errno));
728 goto err_free;
729 }
730
731 switch (type) {
732 case BPF_OBJ_PROG:
733 btf_id = ((struct bpf_prog_info *)info)->btf_id;
734 break;
735 case BPF_OBJ_MAP:
736 btf_id = ((struct bpf_map_info *)info)->btf_id;
737 break;
738 default:
739 err = -1;
740 p_err("unexpected object type: %d", type);
741 goto err_free;
742 }
743 if (!btf_id)
744 continue;
745
746 obj_node = calloc(1, sizeof(*obj_node));
747 if (!obj_node) {
748 p_err("failed to allocate memory: %s", strerror(errno));
749 goto err_free;
750 }
751
752 obj_node->obj_id = id;
753 obj_node->btf_id = btf_id;
754 hash_add(tab->table, &obj_node->hash, obj_node->btf_id);
755 }
756
757 return 0;
758
759 err_free:
760 delete_btf_table(tab);
761 return err;
762 }
763
764 static int
765 build_btf_tables(struct btf_attach_table *btf_prog_table,
766 struct btf_attach_table *btf_map_table)
767 {
768 struct bpf_prog_info prog_info;
769 __u32 prog_len = sizeof(prog_info);
770 struct bpf_map_info map_info;
771 __u32 map_len = sizeof(map_info);
772 int err = 0;
773
774 err = build_btf_type_table(btf_prog_table, BPF_OBJ_PROG, &prog_info,
775 &prog_len);
776 if (err)
777 return err;
778
779 err = build_btf_type_table(btf_map_table, BPF_OBJ_MAP, &map_info,
780 &map_len);
781 if (err) {
782 delete_btf_table(btf_prog_table);
783 return err;
784 }
785
786 return 0;
787 }
788
789 static void
790 show_btf_plain(struct bpf_btf_info *info, int fd,
791 struct btf_attach_table *btf_prog_table,
792 struct btf_attach_table *btf_map_table)
793 {
794 struct btf_attach_point *obj;
795 int n;
796
797 printf("%u: ", info->id);
798 printf("size %uB", info->btf_size);
799
800 n = 0;
801 hash_for_each_possible(btf_prog_table->table, obj, hash, info->id) {
802 if (obj->btf_id == info->id)
803 printf("%s%u", n++ == 0 ? " prog_ids " : ",",
804 obj->obj_id);
805 }
806
807 n = 0;
808 hash_for_each_possible(btf_map_table->table, obj, hash, info->id) {
809 if (obj->btf_id == info->id)
810 printf("%s%u", n++ == 0 ? " map_ids " : ",",
811 obj->obj_id);
812 }
813
814 printf("\n");
815 }
816
817 static void
818 show_btf_json(struct bpf_btf_info *info, int fd,
819 struct btf_attach_table *btf_prog_table,
820 struct btf_attach_table *btf_map_table)
821 {
822 struct btf_attach_point *obj;
823
824 jsonw_start_object(json_wtr); /* btf object */
825 jsonw_uint_field(json_wtr, "id", info->id);
826 jsonw_uint_field(json_wtr, "size", info->btf_size);
827
828 jsonw_name(json_wtr, "prog_ids");
829 jsonw_start_array(json_wtr); /* prog_ids */
830 hash_for_each_possible(btf_prog_table->table, obj, hash,
831 info->id) {
832 if (obj->btf_id == info->id)
833 jsonw_uint(json_wtr, obj->obj_id);
834 }
835 jsonw_end_array(json_wtr); /* prog_ids */
836
837 jsonw_name(json_wtr, "map_ids");
838 jsonw_start_array(json_wtr); /* map_ids */
839 hash_for_each_possible(btf_map_table->table, obj, hash,
840 info->id) {
841 if (obj->btf_id == info->id)
842 jsonw_uint(json_wtr, obj->obj_id);
843 }
844 jsonw_end_array(json_wtr); /* map_ids */
845 jsonw_end_object(json_wtr); /* btf object */
846 }
847
848 static int
849 show_btf(int fd, struct btf_attach_table *btf_prog_table,
850 struct btf_attach_table *btf_map_table)
851 {
852 struct bpf_btf_info info = {};
853 __u32 len = sizeof(info);
854 int err;
855
856 err = bpf_obj_get_info_by_fd(fd, &info, &len);
857 if (err) {
858 p_err("can't get BTF object info: %s", strerror(errno));
859 return -1;
860 }
861
862 if (json_output)
863 show_btf_json(&info, fd, btf_prog_table, btf_map_table);
864 else
865 show_btf_plain(&info, fd, btf_prog_table, btf_map_table);
866
867 return 0;
868 }
869
870 static int do_show(int argc, char **argv)
871 {
872 struct btf_attach_table btf_prog_table;
873 struct btf_attach_table btf_map_table;
874 int err, fd = -1;
875 __u32 id = 0;
876
877 if (argc == 2) {
878 fd = btf_parse_fd(&argc, &argv);
879 if (fd < 0)
880 return -1;
881 }
882
883 if (argc) {
884 if (fd >= 0)
885 close(fd);
886 return BAD_ARG();
887 }
888
889 hash_init(btf_prog_table.table);
890 hash_init(btf_map_table.table);
891 err = build_btf_tables(&btf_prog_table, &btf_map_table);
892 if (err) {
893 if (fd >= 0)
894 close(fd);
895 return err;
896 }
897
898 if (fd >= 0) {
899 err = show_btf(fd, &btf_prog_table, &btf_map_table);
900 close(fd);
901 goto exit_free;
902 }
903
904 if (json_output)
905 jsonw_start_array(json_wtr); /* root array */
906
907 while (true) {
908 err = bpf_btf_get_next_id(id, &id);
909 if (err) {
910 if (errno == ENOENT) {
911 err = 0;
912 break;
913 }
914 p_err("can't get next BTF object: %s%s",
915 strerror(errno),
916 errno == EINVAL ? " -- kernel too old?" : "");
917 err = -1;
918 break;
919 }
920
921 fd = bpf_btf_get_fd_by_id(id);
922 if (fd < 0) {
923 if (errno == ENOENT)
924 continue;
925 p_err("can't get BTF object by id (%u): %s",
926 id, strerror(errno));
927 err = -1;
928 break;
929 }
930
931 err = show_btf(fd, &btf_prog_table, &btf_map_table);
932 close(fd);
933 if (err)
934 break;
935 }
936
937 if (json_output)
938 jsonw_end_array(json_wtr); /* root array */
939
940 exit_free:
941 delete_btf_table(&btf_prog_table);
942 delete_btf_table(&btf_map_table);
943
944 return err;
945 }
946
947 static int do_help(int argc, char **argv)
948 {
949 if (json_output) {
950 jsonw_null(json_wtr);
951 return 0;
952 }
953
954 fprintf(stderr,
955 "Usage: %s btf { show | list } [id BTF_ID]\n"
956 " %s btf dump BTF_SRC [format FORMAT]\n"
957 " %s btf help\n"
958 "\n"
959 " BTF_SRC := { id BTF_ID | prog PROG | map MAP [{key | value | kv | all}] | file FILE }\n"
960 " FORMAT := { raw | c }\n"
961 " " HELP_SPEC_MAP "\n"
962 " " HELP_SPEC_PROGRAM "\n"
963 " " HELP_SPEC_OPTIONS "\n"
964 "",
965 bin_name, bin_name, bin_name);
966
967 return 0;
968 }
969
970 static const struct cmd cmds[] = {
971 { "show", do_show },
972 { "list", do_show },
973 { "help", do_help },
974 { "dump", do_dump },
975 { 0 }
976 };
977
978 int do_btf(int argc, char **argv)
979 {
980 return cmd_select(cmds, argc, argv, do_help);
981 }
Linux with added FPC-III support