summaryrefslogtreecommitdiff
path: root/tools/perf/util/bpf-loader.c
blob: d2c9b09ddb48b751233a09e0cb63945b898f2dc0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
// SPDX-License-Identifier: GPL-2.0
/*
 * bpf-loader.c
 *
 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
 * Copyright (C) 2015 Huawei Inc.
 */

#include <linux/bpf.h>
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
#include <linux/filter.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <errno.h>
#include <stdlib.h>
#include "debug.h"
#include "evlist.h"
#include "bpf-loader.h"
#include "bpf-prologue.h"
#include "probe-event.h"
#include "probe-finder.h" // for MAX_PROBES
#include "parse-events.h"
#include "strfilter.h"
#include "util.h"
#include "llvm-utils.h"
#include "c++/clang-c.h"
#include "hashmap.h"
#include "asm/bug.h"

#include <internal/xyarray.h>

/* temporarily disable libbpf deprecation warnings */
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"

static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)),
			      const char *fmt, va_list args)
{
	return veprintf(1, verbose, pr_fmt(fmt), args);
}

struct bpf_prog_priv {
	bool is_tp;
	char *sys_name;
	char *evt_name;
	struct perf_probe_event pev;
	bool need_prologue;
	struct bpf_insn *insns_buf;
	int nr_types;
	int *type_mapping;
	int *prologue_fds;
};

struct bpf_perf_object {
	struct list_head list;
	struct bpf_object *obj;
};

struct bpf_preproc_result {
	struct bpf_insn *new_insn_ptr;
	int new_insn_cnt;
};

static LIST_HEAD(bpf_objects_list);
static struct hashmap *bpf_program_hash;
static struct hashmap *bpf_map_hash;

static struct bpf_perf_object *
bpf_perf_object__next(struct bpf_perf_object *prev)
{
	if (!prev) {
		if (list_empty(&bpf_objects_list))
			return NULL;

		return list_first_entry(&bpf_objects_list, struct bpf_perf_object, list);
	}
	if (list_is_last(&prev->list, &bpf_objects_list))
		return NULL;

	return list_next_entry(prev, list);
}

#define bpf_perf_object__for_each(perf_obj, tmp)	\
	for ((perf_obj) = bpf_perf_object__next(NULL),	\
	     (tmp) = bpf_perf_object__next(perf_obj);	\
	     (perf_obj) != NULL;			\
	     (perf_obj) = (tmp), (tmp) = bpf_perf_object__next(tmp))

static bool libbpf_initialized;
static int libbpf_sec_handler;

static int bpf_perf_object__add(struct bpf_object *obj)
{
	struct bpf_perf_object *perf_obj = zalloc(sizeof(*perf_obj));

	if (perf_obj) {
		INIT_LIST_HEAD(&perf_obj->list);
		perf_obj->obj = obj;
		list_add_tail(&perf_obj->list, &bpf_objects_list);
	}
	return perf_obj ? 0 : -ENOMEM;
}

static void *program_priv(const struct bpf_program *prog)
{
	void *priv;

	if (IS_ERR_OR_NULL(bpf_program_hash))
		return NULL;
	if (!hashmap__find(bpf_program_hash, prog, &priv))
		return NULL;
	return priv;
}

static struct bpf_insn prologue_init_insn[] = {
	BPF_MOV64_IMM(BPF_REG_2, 0),
	BPF_MOV64_IMM(BPF_REG_3, 0),
	BPF_MOV64_IMM(BPF_REG_4, 0),
	BPF_MOV64_IMM(BPF_REG_5, 0),
};

static int libbpf_prog_prepare_load_fn(struct bpf_program *prog,
				       struct bpf_prog_load_opts *opts __maybe_unused,
				       long cookie __maybe_unused)
{
	size_t init_size_cnt = ARRAY_SIZE(prologue_init_insn);
	size_t orig_insn_cnt, insn_cnt, init_size, orig_size;
	struct bpf_prog_priv *priv = program_priv(prog);
	const struct bpf_insn *orig_insn;
	struct bpf_insn *insn;

	if (IS_ERR_OR_NULL(priv)) {
		pr_debug("bpf: failed to get private field\n");
		return -BPF_LOADER_ERRNO__INTERNAL;
	}

	if (!priv->need_prologue)
		return 0;

	/* prepend initialization code to program instructions */
	orig_insn = bpf_program__insns(prog);
	orig_insn_cnt = bpf_program__insn_cnt(prog);
	init_size = init_size_cnt * sizeof(*insn);
	orig_size = orig_insn_cnt * sizeof(*insn);

	insn_cnt = orig_insn_cnt + init_size_cnt;
	insn = malloc(insn_cnt * sizeof(*insn));
	if (!insn)
		return -ENOMEM;

	memcpy(insn, prologue_init_insn, init_size);
	memcpy((char *) insn + init_size, orig_insn, orig_size);
	bpf_program__set_insns(prog, insn, insn_cnt);
	return 0;
}

static int libbpf_init(void)
{
	LIBBPF_OPTS(libbpf_prog_handler_opts, handler_opts,
		.prog_prepare_load_fn = libbpf_prog_prepare_load_fn,
	);

	if (libbpf_initialized)
		return 0;

	libbpf_set_print(libbpf_perf_print);
	libbpf_sec_handler = libbpf_register_prog_handler(NULL, BPF_PROG_TYPE_KPROBE,
							  0, &handler_opts);
	if (libbpf_sec_handler < 0) {
		pr_debug("bpf: failed to register libbpf section handler: %d\n",
			 libbpf_sec_handler);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}
	libbpf_initialized = true;
	return 0;
}

struct bpf_object *
bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
{
	LIBBPF_OPTS(bpf_object_open_opts, opts, .object_name = name);
	struct bpf_object *obj;
	int err;

	err = libbpf_init();
	if (err)
		return ERR_PTR(err);

	obj = bpf_object__open_mem(obj_buf, obj_buf_sz, &opts);
	if (IS_ERR_OR_NULL(obj)) {
		pr_debug("bpf: failed to load buffer\n");
		return ERR_PTR(-EINVAL);
	}

	if (bpf_perf_object__add(obj)) {
		bpf_object__close(obj);
		return ERR_PTR(-ENOMEM);
	}

	return obj;
}

static void bpf_perf_object__close(struct bpf_perf_object *perf_obj)
{
	list_del(&perf_obj->list);
	bpf_object__close(perf_obj->obj);
	free(perf_obj);
}

struct bpf_object *bpf__prepare_load(const char *filename, bool source)
{
	LIBBPF_OPTS(bpf_object_open_opts, opts, .object_name = filename);
	struct bpf_object *obj;
	int err;

	err = libbpf_init();
	if (err)
		return ERR_PTR(err);

	if (source) {
		void *obj_buf;
		size_t obj_buf_sz;

		perf_clang__init();
		err = perf_clang__compile_bpf(filename, &obj_buf, &obj_buf_sz);
		perf_clang__cleanup();
		if (err) {
			pr_debug("bpf: builtin compilation failed: %d, try external compiler\n", err);
			err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
			if (err)
				return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
		} else
			pr_debug("bpf: successful builtin compilation\n");
		obj = bpf_object__open_mem(obj_buf, obj_buf_sz, &opts);

		if (!IS_ERR_OR_NULL(obj) && llvm_param.dump_obj)
			llvm__dump_obj(filename, obj_buf, obj_buf_sz);

		free(obj_buf);
	} else {
		obj = bpf_object__open(filename);
	}

	if (IS_ERR_OR_NULL(obj)) {
		pr_debug("bpf: failed to load %s\n", filename);
		return obj;
	}

	if (bpf_perf_object__add(obj)) {
		bpf_object__close(obj);
		return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
	}

	return obj;
}

static void close_prologue_programs(struct bpf_prog_priv *priv)
{
	struct perf_probe_event *pev;
	int i, fd;

	if (!priv->need_prologue)
		return;
	pev = &priv->pev;
	for (i = 0; i < pev->ntevs; i++) {
		fd = priv->prologue_fds[i];
		if (fd != -1)
			close(fd);
	}
}

static void
clear_prog_priv(const struct bpf_program *prog __maybe_unused,
		void *_priv)
{
	struct bpf_prog_priv *priv = _priv;

	close_prologue_programs(priv);
	cleanup_perf_probe_events(&priv->pev, 1);
	zfree(&priv->insns_buf);
	zfree(&priv->prologue_fds);
	zfree(&priv->type_mapping);
	zfree(&priv->sys_name);
	zfree(&priv->evt_name);
	free(priv);
}

static void bpf_program_hash_free(void)
{
	struct hashmap_entry *cur;
	size_t bkt;

	if (IS_ERR_OR_NULL(bpf_program_hash))
		return;

	hashmap__for_each_entry(bpf_program_hash, cur, bkt)
		clear_prog_priv(cur->key, cur->value);

	hashmap__free(bpf_program_hash);
	bpf_program_hash = NULL;
}

static void bpf_map_hash_free(void);

void bpf__clear(void)
{
	struct bpf_perf_object *perf_obj, *tmp;

	bpf_perf_object__for_each(perf_obj, tmp) {
		bpf__unprobe(perf_obj->obj);
		bpf_perf_object__close(perf_obj);
	}

	bpf_program_hash_free();
	bpf_map_hash_free();
}

static size_t ptr_hash(const void *__key, void *ctx __maybe_unused)
{
	return (size_t) __key;
}

static bool ptr_equal(const void *key1, const void *key2,
			  void *ctx __maybe_unused)
{
	return key1 == key2;
}

static int program_set_priv(struct bpf_program *prog, void *priv)
{
	void *old_priv;

	/*
	 * Should not happen, we warn about it in the
	 * caller function - config_bpf_program
	 */
	if (IS_ERR(bpf_program_hash))
		return PTR_ERR(bpf_program_hash);

	if (!bpf_program_hash) {
		bpf_program_hash = hashmap__new(ptr_hash, ptr_equal, NULL);
		if (IS_ERR(bpf_program_hash))
			return PTR_ERR(bpf_program_hash);
	}

	old_priv = program_priv(prog);
	if (old_priv) {
		clear_prog_priv(prog, old_priv);
		return hashmap__set(bpf_program_hash, prog, priv, NULL, NULL);
	}
	return hashmap__add(bpf_program_hash, prog, priv);
}

static int
prog_config__exec(const char *value, struct perf_probe_event *pev)
{
	pev->uprobes = true;
	pev->target = strdup(value);
	if (!pev->target)
		return -ENOMEM;
	return 0;
}

static int
prog_config__module(const char *value, struct perf_probe_event *pev)
{
	pev->uprobes = false;
	pev->target = strdup(value);
	if (!pev->target)
		return -ENOMEM;
	return 0;
}

static int
prog_config__bool(const char *value, bool *pbool, bool invert)
{
	int err;
	bool bool_value;

	if (!pbool)
		return -EINVAL;

	err = strtobool(value, &bool_value);
	if (err)
		return err;

	*pbool = invert ? !bool_value : bool_value;
	return 0;
}

static int
prog_config__inlines(const char *value,
		     struct perf_probe_event *pev __maybe_unused)
{
	return prog_config__bool(value, &probe_conf.no_inlines, true);
}

static int
prog_config__force(const char *value,
		   struct perf_probe_event *pev __maybe_unused)
{
	return prog_config__bool(value, &probe_conf.force_add, false);
}

static struct {
	const char *key;
	const char *usage;
	const char *desc;
	int (*func)(const char *, struct perf_probe_event *);
} bpf_prog_config_terms[] = {
	{
		.key	= "exec",
		.usage	= "exec=<full path of file>",
		.desc	= "Set uprobe target",
		.func	= prog_config__exec,
	},
	{
		.key	= "module",
		.usage	= "module=<module name>    ",
		.desc	= "Set kprobe module",
		.func	= prog_config__module,
	},
	{
		.key	= "inlines",
		.usage	= "inlines=[yes|no]        ",
		.desc	= "Probe at inline symbol",
		.func	= prog_config__inlines,
	},
	{
		.key	= "force",
		.usage	= "force=[yes|no]          ",
		.desc	= "Forcibly add events with existing name",
		.func	= prog_config__force,
	},
};

static int
do_prog_config(const char *key, const char *value,
	       struct perf_probe_event *pev)
{
	unsigned int i;

	pr_debug("config bpf program: %s=%s\n", key, value);
	for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
		if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
			return bpf_prog_config_terms[i].func(value, pev);

	pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
		 key, value);

	pr_debug("\nHint: Valid options are:\n");
	for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
		pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
			 bpf_prog_config_terms[i].desc);
	pr_debug("\n");

	return -BPF_LOADER_ERRNO__PROGCONF_TERM;
}

static const char *
parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
{
	char *text = strdup(config_str);
	char *sep, *line;
	const char *main_str = NULL;
	int err = 0;

	if (!text) {
		pr_debug("Not enough memory: dup config_str failed\n");
		return ERR_PTR(-ENOMEM);
	}

	line = text;
	while ((sep = strchr(line, ';'))) {
		char *equ;

		*sep = '\0';
		equ = strchr(line, '=');
		if (!equ) {
			pr_warning("WARNING: invalid config in BPF object: %s\n",
				   line);
			pr_warning("\tShould be 'key=value'.\n");
			goto nextline;
		}
		*equ = '\0';

		err = do_prog_config(line, equ + 1, pev);
		if (err)
			break;
nextline:
		line = sep + 1;
	}

	if (!err)
		main_str = config_str + (line - text);
	free(text);

	return err ? ERR_PTR(err) : main_str;
}

static int
parse_prog_config(const char *config_str, const char **p_main_str,
		  bool *is_tp, struct perf_probe_event *pev)
{
	int err;
	const char *main_str = parse_prog_config_kvpair(config_str, pev);

	if (IS_ERR(main_str))
		return PTR_ERR(main_str);

	*p_main_str = main_str;
	if (!strchr(main_str, '=')) {
		/* Is a tracepoint event? */
		const char *s = strchr(main_str, ':');

		if (!s) {
			pr_debug("bpf: '%s' is not a valid tracepoint\n",
				 config_str);
			return -BPF_LOADER_ERRNO__CONFIG;
		}

		*is_tp = true;
		return 0;
	}

	*is_tp = false;
	err = parse_perf_probe_command(main_str, pev);
	if (err < 0) {
		pr_debug("bpf: '%s' is not a valid config string\n",
			 config_str);
		/* parse failed, don't need clear pev. */
		return -BPF_LOADER_ERRNO__CONFIG;
	}
	return 0;
}

static int
config_bpf_program(struct bpf_program *prog)
{
	struct perf_probe_event *pev = NULL;
	struct bpf_prog_priv *priv = NULL;
	const char *config_str, *main_str;
	bool is_tp = false;
	int err;

	/* Initialize per-program probing setting */
	probe_conf.no_inlines = false;
	probe_conf.force_add = false;

	priv = calloc(sizeof(*priv), 1);
	if (!priv) {
		pr_debug("bpf: failed to alloc priv\n");
		return -ENOMEM;
	}
	pev = &priv->pev;

	config_str = bpf_program__section_name(prog);
	pr_debug("bpf: config program '%s'\n", config_str);
	err = parse_prog_config(config_str, &main_str, &is_tp, pev);
	if (err)
		goto errout;

	if (is_tp) {
		char *s = strchr(main_str, ':');

		priv->is_tp = true;
		priv->sys_name = strndup(main_str, s - main_str);
		priv->evt_name = strdup(s + 1);
		goto set_priv;
	}

	if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
		pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
			 config_str, PERF_BPF_PROBE_GROUP);
		err = -BPF_LOADER_ERRNO__GROUP;
		goto errout;
	} else if (!pev->group)
		pev->group = strdup(PERF_BPF_PROBE_GROUP);

	if (!pev->group) {
		pr_debug("bpf: strdup failed\n");
		err = -ENOMEM;
		goto errout;
	}

	if (!pev->event) {
		pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
			 config_str);
		err = -BPF_LOADER_ERRNO__EVENTNAME;
		goto errout;
	}
	pr_debug("bpf: config '%s' is ok\n", config_str);

set_priv:
	err = program_set_priv(prog, priv);
	if (err) {
		pr_debug("Failed to set priv for program '%s'\n", config_str);
		goto errout;
	}

	return 0;

errout:
	if (pev)
		clear_perf_probe_event(pev);
	free(priv);
	return err;
}

static int bpf__prepare_probe(void)
{
	static int err = 0;
	static bool initialized = false;

	/*
	 * Make err static, so if init failed the first, bpf__prepare_probe()
	 * fails each time without calling init_probe_symbol_maps multiple
	 * times.
	 */
	if (initialized)
		return err;

	initialized = true;
	err = init_probe_symbol_maps(false);
	if (err < 0)
		pr_debug("Failed to init_probe_symbol_maps\n");
	probe_conf.max_probes = MAX_PROBES;
	return err;
}

static int
preproc_gen_prologue(struct bpf_program *prog, int n,
		     const struct bpf_insn *orig_insns, int orig_insns_cnt,
		     struct bpf_preproc_result *res)
{
	struct bpf_prog_priv *priv = program_priv(prog);
	struct probe_trace_event *tev;
	struct perf_probe_event *pev;
	struct bpf_insn *buf;
	size_t prologue_cnt = 0;
	int i, err;

	if (IS_ERR_OR_NULL(priv) || priv->is_tp)
		goto errout;

	pev = &priv->pev;

	if (n < 0 || n >= priv->nr_types)
		goto errout;

	/* Find a tev belongs to that type */
	for (i = 0; i < pev->ntevs; i++) {
		if (priv->type_mapping[i] == n)
			break;
	}

	if (i >= pev->ntevs) {
		pr_debug("Internal error: prologue type %d not found\n", n);
		return -BPF_LOADER_ERRNO__PROLOGUE;
	}

	tev = &pev->tevs[i];

	buf = priv->insns_buf;
	err = bpf__gen_prologue(tev->args, tev->nargs,
				buf, &prologue_cnt,
				BPF_MAXINSNS - orig_insns_cnt);
	if (err) {
		const char *title;

		title = bpf_program__section_name(prog);
		pr_debug("Failed to generate prologue for program %s\n",
			 title);
		return err;
	}

	memcpy(&buf[prologue_cnt], orig_insns,
	       sizeof(struct bpf_insn) * orig_insns_cnt);

	res->new_insn_ptr = buf;
	res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
	return 0;

errout:
	pr_debug("Internal error in preproc_gen_prologue\n");
	return -BPF_LOADER_ERRNO__PROLOGUE;
}

/*
 * compare_tev_args is reflexive, transitive and antisymmetric.
 * I can proof it but this margin is too narrow to contain.
 */
static int compare_tev_args(const void *ptev1, const void *ptev2)
{
	int i, ret;
	const struct probe_trace_event *tev1 =
		*(const struct probe_trace_event **)ptev1;
	const struct probe_trace_event *tev2 =
		*(const struct probe_trace_event **)ptev2;

	ret = tev2->nargs - tev1->nargs;
	if (ret)
		return ret;

	for (i = 0; i < tev1->nargs; i++) {
		struct probe_trace_arg *arg1, *arg2;
		struct probe_trace_arg_ref *ref1, *ref2;

		arg1 = &tev1->args[i];
		arg2 = &tev2->args[i];

		ret = strcmp(arg1->value, arg2->value);
		if (ret)
			return ret;

		ref1 = arg1->ref;
		ref2 = arg2->ref;

		while (ref1 && ref2) {
			ret = ref2->offset - ref1->offset;
			if (ret)
				return ret;

			ref1 = ref1->next;
			ref2 = ref2->next;
		}

		if (ref1 || ref2)
			return ref2 ? 1 : -1;
	}

	return 0;
}

/*
 * Assign a type number to each tevs in a pev.
 * mapping is an array with same slots as tevs in that pev.
 * nr_types will be set to number of types.
 */
static int map_prologue(struct perf_probe_event *pev, int *mapping,
			int *nr_types)
{
	int i, type = 0;
	struct probe_trace_event **ptevs;

	size_t array_sz = sizeof(*ptevs) * pev->ntevs;

	ptevs = malloc(array_sz);
	if (!ptevs) {
		pr_debug("Not enough memory: alloc ptevs failed\n");
		return -ENOMEM;
	}

	pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
	for (i = 0; i < pev->ntevs; i++)
		ptevs[i] = &pev->tevs[i];

	qsort(ptevs, pev->ntevs, sizeof(*ptevs),
	      compare_tev_args);

	for (i = 0; i < pev->ntevs; i++) {
		int n;

		n = ptevs[i] - pev->tevs;
		if (i == 0) {
			mapping[n] = type;
			pr_debug("mapping[%d]=%d\n", n, type);
			continue;
		}

		if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
			mapping[n] = type;
		else
			mapping[n] = ++type;

		pr_debug("mapping[%d]=%d\n", n, mapping[n]);
	}
	free(ptevs);
	*nr_types = type + 1;

	return 0;
}

static int hook_load_preprocessor(struct bpf_program *prog)
{
	struct bpf_prog_priv *priv = program_priv(prog);
	struct perf_probe_event *pev;
	bool need_prologue = false;
	int i;

	if (IS_ERR_OR_NULL(priv)) {
		pr_debug("Internal error when hook preprocessor\n");
		return -BPF_LOADER_ERRNO__INTERNAL;
	}

	if (priv->is_tp) {
		priv->need_prologue = false;
		return 0;
	}

	pev = &priv->pev;
	for (i = 0; i < pev->ntevs; i++) {
		struct probe_trace_event *tev = &pev->tevs[i];

		if (tev->nargs > 0) {
			need_prologue = true;
			break;
		}
	}

	/*
	 * Since all tevs don't have argument, we don't need generate
	 * prologue.
	 */
	if (!need_prologue) {
		priv->need_prologue = false;
		return 0;
	}

	priv->need_prologue = true;
	priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
	if (!priv->insns_buf) {
		pr_debug("Not enough memory: alloc insns_buf failed\n");
		return -ENOMEM;
	}

	priv->prologue_fds = malloc(sizeof(int) * pev->ntevs);
	if (!priv->prologue_fds) {
		pr_debug("Not enough memory: alloc prologue fds failed\n");
		return -ENOMEM;
	}
	memset(priv->prologue_fds, -1, sizeof(int) * pev->ntevs);

	priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
	if (!priv->type_mapping) {
		pr_debug("Not enough memory: alloc type_mapping failed\n");
		return -ENOMEM;
	}
	memset(priv->type_mapping, -1,
	       sizeof(int) * pev->ntevs);

	return map_prologue(pev, priv->type_mapping, &priv->nr_types);
}

int bpf__probe(struct bpf_object *obj)
{
	int err = 0;
	struct bpf_program *prog;
	struct bpf_prog_priv *priv;
	struct perf_probe_event *pev;

	err = bpf__prepare_probe();
	if (err) {
		pr_debug("bpf__prepare_probe failed\n");
		return err;
	}

	bpf_object__for_each_program(prog, obj) {
		err = config_bpf_program(prog);
		if (err)
			goto out;

		priv = program_priv(prog);
		if (IS_ERR_OR_NULL(priv)) {
			if (!priv)
				err = -BPF_LOADER_ERRNO__INTERNAL;
			else
				err = PTR_ERR(priv);
			goto out;
		}

		if (priv->is_tp) {
			bpf_program__set_type(prog, BPF_PROG_TYPE_TRACEPOINT);
			continue;
		}

		bpf_program__set_type(prog, BPF_PROG_TYPE_KPROBE);
		pev = &priv->pev;

		err = convert_perf_probe_events(pev, 1);
		if (err < 0) {
			pr_debug("bpf_probe: failed to convert perf probe events\n");
			goto out;
		}

		err = apply_perf_probe_events(pev, 1);
		if (err < 0) {
			pr_debug("bpf_probe: failed to apply perf probe events\n");
			goto out;
		}

		/*
		 * After probing, let's consider prologue, which
		 * adds program fetcher to BPF programs.
		 *
		 * hook_load_preprocessor() hooks pre-processor
		 * to bpf_program, let it generate prologue
		 * dynamically during loading.
		 */
		err = hook_load_preprocessor(prog);
		if (err)
			goto out;
	}
out:
	return err < 0 ? err : 0;
}

#define EVENTS_WRITE_BUFSIZE  4096
int bpf__unprobe(struct bpf_object *obj)
{
	int err, ret = 0;
	struct bpf_program *prog;

	bpf_object__for_each_program(prog, obj) {
		struct bpf_prog_priv *priv = program_priv(prog);
		int i;

		if (IS_ERR_OR_NULL(priv) || priv->is_tp)
			continue;

		for (i = 0; i < priv->pev.ntevs; i++) {
			struct probe_trace_event *tev = &priv->pev.tevs[i];
			char name_buf[EVENTS_WRITE_BUFSIZE];
			struct strfilter *delfilter;

			snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
				 "%s:%s", tev->group, tev->event);
			name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';

			delfilter = strfilter__new(name_buf, NULL);
			if (!delfilter) {
				pr_debug("Failed to create filter for unprobing\n");
				ret = -ENOMEM;
				continue;
			}

			err = del_perf_probe_events(delfilter);
			strfilter__delete(delfilter);
			if (err) {
				pr_debug("Failed to delete %s\n", name_buf);
				ret = err;
				continue;
			}
		}
	}
	return ret;
}

static int bpf_object__load_prologue(struct bpf_object *obj)
{
	int init_cnt = ARRAY_SIZE(prologue_init_insn);
	const struct bpf_insn *orig_insns;
	struct bpf_preproc_result res;
	struct perf_probe_event *pev;
	struct bpf_program *prog;
	int orig_insns_cnt;

	bpf_object__for_each_program(prog, obj) {
		struct bpf_prog_priv *priv = program_priv(prog);
		int err, i, fd;

		if (IS_ERR_OR_NULL(priv)) {
			pr_debug("bpf: failed to get private field\n");
			return -BPF_LOADER_ERRNO__INTERNAL;
		}

		if (!priv->need_prologue)
			continue;

		/*
		 * For each program that needs prologue we do following:
		 *
		 * - take its current instructions and use them
		 *   to generate the new code with prologue
		 * - load new instructions with bpf_prog_load
		 *   and keep the fd in prologue_fds
		 * - new fd will be used in bpf__foreach_event
		 *   to connect this program with perf evsel
		 */
		orig_insns = bpf_program__insns(prog);
		orig_insns_cnt = bpf_program__insn_cnt(prog);

		pev = &priv->pev;
		for (i = 0; i < pev->ntevs; i++) {
			/*
			 * Skipping artificall prologue_init_insn instructions
			 * (init_cnt), so the prologue can be generated instead
			 * of them.
			 */
			err = preproc_gen_prologue(prog, i,
						   orig_insns + init_cnt,
						   orig_insns_cnt - init_cnt,
						   &res);
			if (err)
				return err;

			fd = bpf_prog_load(bpf_program__get_type(prog),
					   bpf_program__name(prog), "GPL",
					   res.new_insn_ptr,
					   res.new_insn_cnt, NULL);
			if (fd < 0) {
				char bf[128];

				libbpf_strerror(-errno, bf, sizeof(bf));
				pr_debug("bpf: load objects with prologue failed: err=%d: (%s)\n",
					 -errno, bf);
				return -errno;
			}
			priv->prologue_fds[i] = fd;
		}
		/*
		 * We no longer need the original program,
		 * we can unload it.
		 */
		bpf_program__unload(prog);
	}
	return 0;
}

int bpf__load(struct bpf_object *obj)
{
	int err;

	err = bpf_object__load(obj);
	if (err) {
		char bf[128];
		libbpf_strerror(err, bf, sizeof(bf));
		pr_debug("bpf: load objects failed: err=%d: (%s)\n", err, bf);
		return err;
	}
	return bpf_object__load_prologue(obj);
}

int bpf__foreach_event(struct bpf_object *obj,
		       bpf_prog_iter_callback_t func,
		       void *arg)
{
	struct bpf_program *prog;
	int err;

	bpf_object__for_each_program(prog, obj) {
		struct bpf_prog_priv *priv = program_priv(prog);
		struct probe_trace_event *tev;
		struct perf_probe_event *pev;
		int i, fd;

		if (IS_ERR_OR_NULL(priv)) {
			pr_debug("bpf: failed to get private field\n");
			return -BPF_LOADER_ERRNO__INTERNAL;
		}

		if (priv->is_tp) {
			fd = bpf_program__fd(prog);
			err = (*func)(priv->sys_name, priv->evt_name, fd, obj, arg);
			if (err) {
				pr_debug("bpf: tracepoint call back failed, stop iterate\n");
				return err;
			}
			continue;
		}

		pev = &priv->pev;
		for (i = 0; i < pev->ntevs; i++) {
			tev = &pev->tevs[i];

			if (priv->need_prologue)
				fd = priv->prologue_fds[i];
			else
				fd = bpf_program__fd(prog);

			if (fd < 0) {
				pr_debug("bpf: failed to get file descriptor\n");
				return fd;
			}

			err = (*func)(tev->group, tev->event, fd, obj, arg);
			if (err) {
				pr_debug("bpf: call back failed, stop iterate\n");
				return err;
			}
		}
	}
	return 0;
}

enum bpf_map_op_type {
	BPF_MAP_OP_SET_VALUE,
	BPF_MAP_OP_SET_EVSEL,
};

enum bpf_map_key_type {
	BPF_MAP_KEY_ALL,
	BPF_MAP_KEY_RANGES,
};

struct bpf_map_op {
	struct list_head list;
	enum bpf_map_op_type op_type;
	enum bpf_map_key_type key_type;
	union {
		struct parse_events_array array;
	} k;
	union {
		u64 value;
		struct evsel *evsel;
	} v;
};

struct bpf_map_priv {
	struct list_head ops_list;
};

static void
bpf_map_op__delete(struct bpf_map_op *op)
{
	if (!list_empty(&op->list))
		list_del_init(&op->list);
	if (op->key_type == BPF_MAP_KEY_RANGES)
		parse_events__clear_array(&op->k.array);
	free(op);
}

static void
bpf_map_priv__purge(struct bpf_map_priv *priv)
{
	struct bpf_map_op *pos, *n;

	list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
		list_del_init(&pos->list);
		bpf_map_op__delete(pos);
	}
}

static void
bpf_map_priv__clear(const struct bpf_map *map __maybe_unused,
		    void *_priv)
{
	struct bpf_map_priv *priv = _priv;

	bpf_map_priv__purge(priv);
	free(priv);
}

static void *map_priv(const struct bpf_map *map)
{
	void *priv;

	if (IS_ERR_OR_NULL(bpf_map_hash))
		return NULL;
	if (!hashmap__find(bpf_map_hash, map, &priv))
		return NULL;
	return priv;
}

static void bpf_map_hash_free(void)
{
	struct hashmap_entry *cur;
	size_t bkt;

	if (IS_ERR_OR_NULL(bpf_map_hash))
		return;

	hashmap__for_each_entry(bpf_map_hash, cur, bkt)
		bpf_map_priv__clear(cur->key, cur->value);

	hashmap__free(bpf_map_hash);
	bpf_map_hash = NULL;
}

static int map_set_priv(struct bpf_map *map, void *priv)
{
	void *old_priv;

	if (WARN_ON_ONCE(IS_ERR(bpf_map_hash)))
		return PTR_ERR(bpf_program_hash);

	if (!bpf_map_hash) {
		bpf_map_hash = hashmap__new(ptr_hash, ptr_equal, NULL);
		if (IS_ERR(bpf_map_hash))
			return PTR_ERR(bpf_map_hash);
	}

	old_priv = map_priv(map);
	if (old_priv) {
		bpf_map_priv__clear(map, old_priv);
		return hashmap__set(bpf_map_hash, map, priv, NULL, NULL);
	}
	return hashmap__add(bpf_map_hash, map, priv);
}

static int
bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
{
	op->key_type = BPF_MAP_KEY_ALL;
	if (!term)
		return 0;

	if (term->array.nr_ranges) {
		size_t memsz = term->array.nr_ranges *
				sizeof(op->k.array.ranges[0]);

		op->k.array.ranges = memdup(term->array.ranges, memsz);
		if (!op->k.array.ranges) {
			pr_debug("Not enough memory to alloc indices for map\n");
			return -ENOMEM;
		}
		op->key_type = BPF_MAP_KEY_RANGES;
		op->k.array.nr_ranges = term->array.nr_ranges;
	}
	return 0;
}

static struct bpf_map_op *
bpf_map_op__new(struct parse_events_term *term)
{
	struct bpf_map_op *op;
	int err;

	op = zalloc(sizeof(*op));
	if (!op) {
		pr_debug("Failed to alloc bpf_map_op\n");
		return ERR_PTR(-ENOMEM);
	}
	INIT_LIST_HEAD(&op->list);

	err = bpf_map_op_setkey(op, term);
	if (err) {
		free(op);
		return ERR_PTR(err);
	}
	return op;
}

static struct bpf_map_op *
bpf_map_op__clone(struct bpf_map_op *op)
{
	struct bpf_map_op *newop;

	newop = memdup(op, sizeof(*op));
	if (!newop) {
		pr_debug("Failed to alloc bpf_map_op\n");
		return NULL;
	}

	INIT_LIST_HEAD(&newop->list);
	if (op->key_type == BPF_MAP_KEY_RANGES) {
		size_t memsz = op->k.array.nr_ranges *
			       sizeof(op->k.array.ranges[0]);

		newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
		if (!newop->k.array.ranges) {
			pr_debug("Failed to alloc indices for map\n");
			free(newop);
			return NULL;
		}
	}

	return newop;
}

static struct bpf_map_priv *
bpf_map_priv__clone(struct bpf_map_priv *priv)
{
	struct bpf_map_priv *newpriv;
	struct bpf_map_op *pos, *newop;

	newpriv = zalloc(sizeof(*newpriv));
	if (!newpriv) {
		pr_debug("Not enough memory to alloc map private\n");
		return NULL;
	}
	INIT_LIST_HEAD(&newpriv->ops_list);

	list_for_each_entry(pos, &priv->ops_list, list) {
		newop = bpf_map_op__clone(pos);
		if (!newop) {
			bpf_map_priv__purge(newpriv);
			return NULL;
		}
		list_add_tail(&newop->list, &newpriv->ops_list);
	}

	return newpriv;
}

static int
bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
{
	const char *map_name = bpf_map__name(map);
	struct bpf_map_priv *priv = map_priv(map);

	if (IS_ERR(priv)) {
		pr_debug("Failed to get private from map %s\n", map_name);
		return PTR_ERR(priv);
	}

	if (!priv) {
		priv = zalloc(sizeof(*priv));
		if (!priv) {
			pr_debug("Not enough memory to alloc map private\n");
			return -ENOMEM;
		}
		INIT_LIST_HEAD(&priv->ops_list);

		if (map_set_priv(map, priv)) {
			free(priv);
			return -BPF_LOADER_ERRNO__INTERNAL;
		}
	}

	list_add_tail(&op->list, &priv->ops_list);
	return 0;
}

static struct bpf_map_op *
bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
{
	struct bpf_map_op *op;
	int err;

	op = bpf_map_op__new(term);
	if (IS_ERR(op))
		return op;

	err = bpf_map__add_op(map, op);
	if (err) {
		bpf_map_op__delete(op);
		return ERR_PTR(err);
	}
	return op;
}

static int
__bpf_map__config_value(struct bpf_map *map,
			struct parse_events_term *term)
{
	struct bpf_map_op *op;
	const char *map_name = bpf_map__name(map);

	if (!map) {
		pr_debug("Map '%s' is invalid\n", map_name);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}

	if (bpf_map__type(map) != BPF_MAP_TYPE_ARRAY) {
		pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
			 map_name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
	}
	if (bpf_map__key_size(map) < sizeof(unsigned int)) {
		pr_debug("Map %s has incorrect key size\n", map_name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
	}
	switch (bpf_map__value_size(map)) {
	case 1:
	case 2:
	case 4:
	case 8:
		break;
	default:
		pr_debug("Map %s has incorrect value size\n", map_name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
	}

	op = bpf_map__add_newop(map, term);
	if (IS_ERR(op))
		return PTR_ERR(op);
	op->op_type = BPF_MAP_OP_SET_VALUE;
	op->v.value = term->val.num;
	return 0;
}

static int
bpf_map__config_value(struct bpf_map *map,
		      struct parse_events_term *term,
		      struct evlist *evlist __maybe_unused)
{
	if (!term->err_val) {
		pr_debug("Config value not set\n");
		return -BPF_LOADER_ERRNO__OBJCONF_CONF;
	}

	if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
		pr_debug("ERROR: wrong value type for 'value'\n");
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
	}

	return __bpf_map__config_value(map, term);
}

static int
__bpf_map__config_event(struct bpf_map *map,
			struct parse_events_term *term,
			struct evlist *evlist)
{
	struct bpf_map_op *op;
	const char *map_name = bpf_map__name(map);
	struct evsel *evsel = evlist__find_evsel_by_str(evlist, term->val.str);

	if (!evsel) {
		pr_debug("Event (for '%s') '%s' doesn't exist\n",
			 map_name, term->val.str);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
	}

	if (!map) {
		pr_debug("Map '%s' is invalid\n", map_name);
		return PTR_ERR(map);
	}

	/*
	 * No need to check key_size and value_size:
	 * kernel has already checked them.
	 */
	if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
		pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
			 map_name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
	}

	op = bpf_map__add_newop(map, term);
	if (IS_ERR(op))
		return PTR_ERR(op);
	op->op_type = BPF_MAP_OP_SET_EVSEL;
	op->v.evsel = evsel;
	return 0;
}

static int
bpf_map__config_event(struct bpf_map *map,
		      struct parse_events_term *term,
		      struct evlist *evlist)
{
	if (!term->err_val) {
		pr_debug("Config value not set\n");
		return -BPF_LOADER_ERRNO__OBJCONF_CONF;
	}

	if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
		pr_debug("ERROR: wrong value type for 'event'\n");
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
	}

	return __bpf_map__config_event(map, term, evlist);
}

struct bpf_obj_config__map_func {
	const char *config_opt;
	int (*config_func)(struct bpf_map *, struct parse_events_term *,
			   struct evlist *);
};

struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
	{"value", bpf_map__config_value},
	{"event", bpf_map__config_event},
};

static int
config_map_indices_range_check(struct parse_events_term *term,
			       struct bpf_map *map,
			       const char *map_name)
{
	struct parse_events_array *array = &term->array;
	unsigned int i;

	if (!array->nr_ranges)
		return 0;
	if (!array->ranges) {
		pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
			 map_name, (int)array->nr_ranges);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}

	if (!map) {
		pr_debug("Map '%s' is invalid\n", map_name);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}

	for (i = 0; i < array->nr_ranges; i++) {
		unsigned int start = array->ranges[i].start;
		size_t length = array->ranges[i].length;
		unsigned int idx = start + length - 1;

		if (idx >= bpf_map__max_entries(map)) {
			pr_debug("ERROR: index %d too large\n", idx);
			return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
		}
	}
	return 0;
}

static int
bpf__obj_config_map(struct bpf_object *obj,
		    struct parse_events_term *term,
		    struct evlist *evlist,
		    int *key_scan_pos)
{
	/* key is "map:<mapname>.<config opt>" */
	char *map_name = strdup(term->config + sizeof("map:") - 1);
	struct bpf_map *map;
	int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
	char *map_opt;
	size_t i;

	if (!map_name)
		return -ENOMEM;

	map_opt = strchr(map_name, '.');
	if (!map_opt) {
		pr_debug("ERROR: Invalid map config: %s\n", map_name);
		goto out;
	}

	*map_opt++ = '\0';
	if (*map_opt == '\0') {
		pr_debug("ERROR: Invalid map option: %s\n", term->config);
		goto out;
	}

	map = bpf_object__find_map_by_name(obj, map_name);
	if (!map) {
		pr_debug("ERROR: Map %s doesn't exist\n", map_name);
		err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
		goto out;
	}

	*key_scan_pos += strlen(map_opt);
	err = config_map_indices_range_check(term, map, map_name);
	if (err)
		goto out;
	*key_scan_pos -= strlen(map_opt);

	for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
		struct bpf_obj_config__map_func *func =
				&bpf_obj_config__map_funcs[i];

		if (strcmp(map_opt, func->config_opt) == 0) {
			err = func->config_func(map, term, evlist);
			goto out;
		}
	}

	pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
	err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
out:
	if (!err)
		*key_scan_pos += strlen(map_opt);

	free(map_name);
	return err;
}

int bpf__config_obj(struct bpf_object *obj,
		    struct parse_events_term *term,
		    struct evlist *evlist,
		    int *error_pos)
{
	int key_scan_pos = 0;
	int err;

	if (!obj || !term || !term->config)
		return -EINVAL;

	if (strstarts(term->config, "map:")) {
		key_scan_pos = sizeof("map:") - 1;
		err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
		goto out;
	}
	err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
out:
	if (error_pos)
		*error_pos = key_scan_pos;
	return err;

}

typedef int (*map_config_func_t)(const char *name, int map_fd,
				 const struct bpf_map *map,
				 struct bpf_map_op *op,
				 void *pkey, void *arg);

static int
foreach_key_array_all(map_config_func_t func,
		      void *arg, const char *name,
		      int map_fd, const struct bpf_map *map,
		      struct bpf_map_op *op)
{
	unsigned int i;
	int err;

	for (i = 0; i < bpf_map__max_entries(map); i++) {
		err = func(name, map_fd, map, op, &i, arg);
		if (err) {
			pr_debug("ERROR: failed to insert value to %s[%u]\n",
				 name, i);
			return err;
		}
	}
	return 0;
}

static int
foreach_key_array_ranges(map_config_func_t func, void *arg,
			 const char *name, int map_fd,
			 const struct bpf_map *map,
			 struct bpf_map_op *op)
{
	unsigned int i, j;
	int err;

	for (i = 0; i < op->k.array.nr_ranges; i++) {
		unsigned int start = op->k.array.ranges[i].start;
		size_t length = op->k.array.ranges[i].length;

		for (j = 0; j < length; j++) {
			unsigned int idx = start + j;

			err = func(name, map_fd, map, op, &idx, arg);
			if (err) {
				pr_debug("ERROR: failed to insert value to %s[%u]\n",
					 name, idx);
				return err;
			}
		}
	}
	return 0;
}

static int
bpf_map_config_foreach_key(struct bpf_map *map,
			   map_config_func_t func,
			   void *arg)
{
	int err, map_fd, type;
	struct bpf_map_op *op;
	const char *name = bpf_map__name(map);
	struct bpf_map_priv *priv = map_priv(map);

	if (IS_ERR(priv)) {
		pr_debug("ERROR: failed to get private from map %s\n", name);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}
	if (!priv || list_empty(&priv->ops_list)) {
		pr_debug("INFO: nothing to config for map %s\n", name);
		return 0;
	}

	if (!map) {
		pr_debug("Map '%s' is invalid\n", name);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}
	map_fd = bpf_map__fd(map);
	if (map_fd < 0) {
		pr_debug("ERROR: failed to get fd from map %s\n", name);
		return map_fd;
	}

	type = bpf_map__type(map);
	list_for_each_entry(op, &priv->ops_list, list) {
		switch (type) {
		case BPF_MAP_TYPE_ARRAY:
		case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
			switch (op->key_type) {
			case BPF_MAP_KEY_ALL:
				err = foreach_key_array_all(func, arg, name,
							    map_fd, map, op);
				break;
			case BPF_MAP_KEY_RANGES:
				err = foreach_key_array_ranges(func, arg, name,
							       map_fd, map, op);
				break;
			default:
				pr_debug("ERROR: keytype for map '%s' invalid\n",
					 name);
				return -BPF_LOADER_ERRNO__INTERNAL;
			}
			if (err)
				return err;
			break;
		default:
			pr_debug("ERROR: type of '%s' incorrect\n", name);
			return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
		}
	}

	return 0;
}

static int
apply_config_value_for_key(int map_fd, void *pkey,
			   size_t val_size, u64 val)
{
	int err = 0;

	switch (val_size) {
	case 1: {
		u8 _val = (u8)(val);
		err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
		break;
	}
	case 2: {
		u16 _val = (u16)(val);
		err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
		break;
	}
	case 4: {
		u32 _val = (u32)(val);
		err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
		break;
	}
	case 8: {
		err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
		break;
	}
	default:
		pr_debug("ERROR: invalid value size\n");
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
	}
	if (err && errno)
		err = -errno;
	return err;
}

static int
apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
			   struct evsel *evsel)
{
	struct xyarray *xy = evsel->core.fd;
	struct perf_event_attr *attr;
	unsigned int key, events;
	bool check_pass = false;
	int *evt_fd;
	int err;

	if (!xy) {
		pr_debug("ERROR: evsel not ready for map %s\n", name);
		return -BPF_LOADER_ERRNO__INTERNAL;
	}

	if (xy->row_size / xy->entry_size != 1) {
		pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
			 name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
	}

	attr = &evsel->core.attr;
	if (attr->inherit) {
		pr_debug("ERROR: Can't put inherit event into map %s\n", name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
	}

	if (evsel__is_bpf_output(evsel))
		check_pass = true;
	if (attr->type == PERF_TYPE_RAW)
		check_pass = true;
	if (attr->type == PERF_TYPE_HARDWARE)
		check_pass = true;
	if (!check_pass) {
		pr_debug("ERROR: Event type is wrong for map %s\n", name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
	}

	events = xy->entries / (xy->row_size / xy->entry_size);
	key = *((unsigned int *)pkey);
	if (key >= events) {
		pr_debug("ERROR: there is no event %d for map %s\n",
			 key, name);
		return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
	}
	evt_fd = xyarray__entry(xy, key, 0);
	err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
	if (err && errno)
		err = -errno;
	return err;
}

static int
apply_obj_config_map_for_key(const char *name, int map_fd,
			     const struct bpf_map *map,
			     struct bpf_map_op *op,
			     void *pkey, void *arg __maybe_unused)
{
	int err;

	switch (op->op_type) {
	case BPF_MAP_OP_SET_VALUE:
		err = apply_config_value_for_key(map_fd, pkey,
						 bpf_map__value_size(map),
						 op->v.value);
		break;
	case BPF_MAP_OP_SET_EVSEL:
		err = apply_config_evsel_for_key(name, map_fd, pkey,
						 op->v.evsel);
		break;
	default:
		pr_debug("ERROR: unknown value type for '%s'\n", name);
		err = -BPF_LOADER_ERRNO__INTERNAL;
	}
	return err;
}

static int
apply_obj_config_map(struct bpf_map *map)
{
	return bpf_map_config_foreach_key(map,
					  apply_obj_config_map_for_key,
					  NULL);
}

static int
apply_obj_config_object(struct bpf_object *obj)
{
	struct bpf_map *map;
	int err;

	bpf_object__for_each_map(map, obj) {
		err = apply_obj_config_map(map);
		if (err)
			return err;
	}
	return 0;
}

int bpf__apply_obj_config(void)
{
	struct bpf_perf_object *perf_obj, *tmp;
	int err;

	bpf_perf_object__for_each(perf_obj, tmp) {
		err = apply_obj_config_object(perf_obj->obj);
		if (err)
			return err;
	}

	return 0;
}

#define bpf__perf_for_each_map(map, pobj, tmp)			\
	bpf_perf_object__for_each(pobj, tmp)			\
		bpf_object__for_each_map(map, pobj->obj)

#define bpf__perf_for_each_map_named(map, pobj, pobjtmp, name)	\
	bpf__perf_for_each_map(map, pobj, pobjtmp)		\
		if (bpf_map__name(map) && (strcmp(name, bpf_map__name(map)) == 0))

struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name)
{
	struct bpf_map_priv *tmpl_priv = NULL;
	struct bpf_perf_object *perf_obj, *tmp;
	struct evsel *evsel = NULL;
	struct bpf_map *map;
	int err;
	bool need_init = false;

	bpf__perf_for_each_map_named(map, perf_obj, tmp, name) {
		struct bpf_map_priv *priv = map_priv(map);

		if (IS_ERR(priv))
			return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);

		/*
		 * No need to check map type: type should have been
		 * verified by kernel.
		 */
		if (!need_init && !priv)
			need_init = !priv;
		if (!tmpl_priv && priv)
			tmpl_priv = priv;
	}

	if (!need_init)
		return NULL;

	if (!tmpl_priv) {
		char *event_definition = NULL;

		if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
			return ERR_PTR(-ENOMEM);

		err = parse_events(evlist, event_definition, NULL);
		free(event_definition);

		if (err) {
			pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
			return ERR_PTR(-err);
		}

		evsel = evlist__last(evlist);
	}

	bpf__perf_for_each_map_named(map, perf_obj, tmp, name) {
		struct bpf_map_priv *priv = map_priv(map);

		if (IS_ERR(priv))
			return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
		if (priv)
			continue;

		if (tmpl_priv) {
			priv = bpf_map_priv__clone(tmpl_priv);
			if (!priv)
				return ERR_PTR(-ENOMEM);

			err = map_set_priv(map, priv);
			if (err) {
				bpf_map_priv__clear(map, priv);
				return ERR_PTR(err);
			}
		} else if (evsel) {
			struct bpf_map_op *op;

			op = bpf_map__add_newop(map, NULL);
			if (IS_ERR(op))
				return ERR_CAST(op);
			op->op_type = BPF_MAP_OP_SET_EVSEL;
			op->v.evsel = evsel;
		}
	}

	return evsel;
}

int bpf__setup_stdout(struct evlist *evlist)
{
	struct evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
	return PTR_ERR_OR_ZERO(evsel);
}

#define ERRNO_OFFSET(e)		((e) - __BPF_LOADER_ERRNO__START)
#define ERRCODE_OFFSET(c)	ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
#define NR_ERRNO	(__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)

static const char *bpf_loader_strerror_table[NR_ERRNO] = {
	[ERRCODE_OFFSET(CONFIG)]	= "Invalid config string",
	[ERRCODE_OFFSET(GROUP)]		= "Invalid group name",
	[ERRCODE_OFFSET(EVENTNAME)]	= "No event name found in config string",
	[ERRCODE_OFFSET(INTERNAL)]	= "BPF loader internal error",
	[ERRCODE_OFFSET(COMPILE)]	= "Error when compiling BPF scriptlet",
	[ERRCODE_OFFSET(PROGCONF_TERM)]	= "Invalid program config term in config string",
	[ERRCODE_OFFSET(PROLOGUE)]	= "Failed to generate prologue",
	[ERRCODE_OFFSET(PROLOGUE2BIG)]	= "Prologue too big for program",
	[ERRCODE_OFFSET(PROLOGUEOOB)]	= "Offset out of bound for prologue",
	[ERRCODE_OFFSET(OBJCONF_OPT)]	= "Invalid object config option",
	[ERRCODE_OFFSET(OBJCONF_CONF)]	= "Config value not set (missing '=')",
	[ERRCODE_OFFSET(OBJCONF_MAP_OPT)]	= "Invalid object map config option",
	[ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)]	= "Target map doesn't exist",
	[ERRCODE_OFFSET(OBJCONF_MAP_VALUE)]	= "Incorrect value type for map",
	[ERRCODE_OFFSET(OBJCONF_MAP_TYPE)]	= "Incorrect map type",
	[ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)]	= "Incorrect map key size",
	[ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)]	= "Incorrect map value size",
	[ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)]	= "Event not found for map setting",
	[ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)]	= "Invalid map size for event setting",
	[ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)]	= "Event dimension too large",
	[ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)]	= "Doesn't support inherit event",
	[ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)]	= "Wrong event type for map",
	[ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)]	= "Index too large",
};

static int
bpf_loader_strerror(int err, char *buf, size_t size)
{
	char sbuf[STRERR_BUFSIZE];
	const char *msg;

	if (!buf || !size)
		return -1;

	err = err > 0 ? err : -err;

	if (err >= __LIBBPF_ERRNO__START)
		return libbpf_strerror(err, buf, size);

	if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
		msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
		snprintf(buf, size, "%s", msg);
		buf[size - 1] = '\0';
		return 0;
	}

	if (err >= __BPF_LOADER_ERRNO__END)
		snprintf(buf, size, "Unknown bpf loader error %d", err);
	else
		snprintf(buf, size, "%s",
			 str_error_r(err, sbuf, sizeof(sbuf)));

	buf[size - 1] = '\0';
	return -1;
}

#define bpf__strerror_head(err, buf, size) \
	char sbuf[STRERR_BUFSIZE], *emsg;\
	if (!size)\
		return 0;\
	if (err < 0)\
		err = -err;\
	bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
	emsg = sbuf;\
	switch (err) {\
	default:\
		scnprintf(buf, size, "%s", emsg);\
		break;

#define bpf__strerror_entry(val, fmt...)\
	case val: {\
		scnprintf(buf, size, fmt);\
		break;\
	}

#define bpf__strerror_end(buf, size)\
	}\
	buf[size - 1] = '\0';

int bpf__strerror_prepare_load(const char *filename, bool source,
			       int err, char *buf, size_t size)
{
	size_t n;
	int ret;

	n = snprintf(buf, size, "Failed to load %s%s: ",
			 filename, source ? " from source" : "");
	if (n >= size) {
		buf[size - 1] = '\0';
		return 0;
	}
	buf += n;
	size -= n;

	ret = bpf_loader_strerror(err, buf, size);
	buf[size - 1] = '\0';
	return ret;
}

int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
			int err, char *buf, size_t size)
{
	bpf__strerror_head(err, buf, size);
	case BPF_LOADER_ERRNO__PROGCONF_TERM: {
		scnprintf(buf, size, "%s (add -v to see detail)", emsg);
		break;
	}
	bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
	bpf__strerror_entry(EACCES, "You need to be root");
	bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
	bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
	bpf__strerror_end(buf, size);
	return 0;
}

int bpf__strerror_load(struct bpf_object *obj,
		       int err, char *buf, size_t size)
{
	bpf__strerror_head(err, buf, size);
	case LIBBPF_ERRNO__KVER: {
		unsigned int obj_kver = bpf_object__kversion(obj);
		unsigned int real_kver;

		if (fetch_kernel_version(&real_kver, NULL, 0)) {
			scnprintf(buf, size, "Unable to fetch kernel version");
			break;
		}

		if (obj_kver != real_kver) {
			scnprintf(buf, size,
				  "'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
				  KVER_PARAM(obj_kver),
				  KVER_PARAM(real_kver));
			break;
		}

		scnprintf(buf, size, "Failed to load program for unknown reason");
		break;
	}
	bpf__strerror_end(buf, size);
	return 0;
}

int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
			     struct parse_events_term *term __maybe_unused,
			     struct evlist *evlist __maybe_unused,
			     int *error_pos __maybe_unused, int err,
			     char *buf, size_t size)
{
	bpf__strerror_head(err, buf, size);
	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
			    "Can't use this config term with this map type");
	bpf__strerror_end(buf, size);
	return 0;
}

int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
{
	bpf__strerror_head(err, buf, size);
	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
			    "Cannot set event to BPF map in multi-thread tracing");
	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
			    "%s (Hint: use -i to turn off inherit)", emsg);
	bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
			    "Can only put raw, hardware and BPF output event into a BPF map");
	bpf__strerror_end(buf, size);
	return 0;
}

int bpf__strerror_setup_output_event(struct evlist *evlist __maybe_unused,
				     int err, char *buf, size_t size)
{
	bpf__strerror_head(err, buf, size);
	bpf__strerror_end(buf, size);
	return 0;
}