1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/err.h>
4 #include <string.h>
5 #include <bpf/btf.h>
6 #include <bpf/libbpf.h>
7 #include <linux/btf.h>
8 #include <linux/kernel.h>
9 #define CONFIG_DEBUG_INFO_BTF
10 #include <linux/btf_ids.h>
11 #include "test_progs.h"
12
13 static int duration;
14
15 struct symbol {
16 const char *name;
17 int type;
18 int id;
19 };
20
21 struct symbol test_symbols[] = {
22 { "unused", BTF_KIND_UNKN, 0 },
23 { "S", BTF_KIND_TYPEDEF, -1 },
24 { "T", BTF_KIND_TYPEDEF, -1 },
25 { "U", BTF_KIND_TYPEDEF, -1 },
26 { "S", BTF_KIND_STRUCT, -1 },
27 { "U", BTF_KIND_UNION, -1 },
28 { "func", BTF_KIND_FUNC, -1 },
29 };
30
31 /* Align the .BTF_ids section to 4 bytes */
32 asm (
33 ".pushsection " BTF_IDS_SECTION " ,\"a\"; \n"
34 ".balign 4, 0; \n"
35 ".popsection; \n");
36
37 BTF_ID_LIST(test_list_local)
38 BTF_ID_UNUSED
39 BTF_ID(typedef, S)
40 BTF_ID(typedef, T)
41 BTF_ID(typedef, U)
42 BTF_ID(struct, S)
43 BTF_ID(union, U)
44 BTF_ID(func, func)
45
46 extern __u32 test_list_global[];
47 BTF_ID_LIST_GLOBAL(test_list_global, 1)
48 BTF_ID_UNUSED
BTF_ID(typedef,S)49 BTF_ID(typedef, S)
50 BTF_ID(typedef, T)
51 BTF_ID(typedef, U)
52 BTF_ID(struct, S)
53 BTF_ID(union, U)
54 BTF_ID(func, func)
55
56 BTF_SET_START(test_set)
57 BTF_ID(typedef, S)
58 BTF_ID(typedef, T)
59 BTF_ID(typedef, U)
60 BTF_ID(struct, S)
61 BTF_ID(union, U)
62 BTF_ID(func, func)
63 BTF_SET_END(test_set)
64
65 static int
66 __resolve_symbol(struct btf *btf, int type_id)
67 {
68 const struct btf_type *type;
69 const char *str;
70 unsigned int i;
71
72 type = btf__type_by_id(btf, type_id);
73 if (!type) {
74 PRINT_FAIL("Failed to get type for ID %d\n", type_id);
75 return -1;
76 }
77
78 for (i = 0; i < ARRAY_SIZE(test_symbols); i++) {
79 if (test_symbols[i].id >= 0)
80 continue;
81
82 if (BTF_INFO_KIND(type->info) != test_symbols[i].type)
83 continue;
84
85 str = btf__name_by_offset(btf, type->name_off);
86 if (!str) {
87 PRINT_FAIL("Failed to get name for BTF ID %d\n", type_id);
88 return -1;
89 }
90
91 if (!strcmp(str, test_symbols[i].name))
92 test_symbols[i].id = type_id;
93 }
94
95 return 0;
96 }
97
resolve_symbols(void)98 static int resolve_symbols(void)
99 {
100 struct btf *btf;
101 int type_id;
102 __u32 nr;
103
104 btf = btf__parse_elf("btf_data.bpf.o", NULL);
105 if (CHECK(libbpf_get_error(btf), "resolve",
106 "Failed to load BTF from btf_data.bpf.o\n"))
107 return -1;
108
109 nr = btf__type_cnt(btf);
110
111 for (type_id = 1; type_id < nr; type_id++) {
112 if (__resolve_symbol(btf, type_id))
113 break;
114 }
115
116 btf__free(btf);
117 return 0;
118 }
119
test_resolve_btfids(void)120 void test_resolve_btfids(void)
121 {
122 __u32 *test_list, *test_lists[] = { test_list_local, test_list_global };
123 unsigned int i, j;
124 int ret = 0;
125
126 if (resolve_symbols())
127 return;
128
129 /* Check BTF_ID_LIST(test_list_local) and
130 * BTF_ID_LIST_GLOBAL(test_list_global) IDs
131 */
132 for (j = 0; j < ARRAY_SIZE(test_lists); j++) {
133 test_list = test_lists[j];
134 for (i = 0; i < ARRAY_SIZE(test_symbols); i++) {
135 ret = CHECK(test_list[i] != test_symbols[i].id,
136 "id_check",
137 "wrong ID for %s (%d != %d)\n",
138 test_symbols[i].name,
139 test_list[i], test_symbols[i].id);
140 if (ret)
141 return;
142 }
143 }
144
145 /* Check BTF_SET_START(test_set) IDs */
146 for (i = 0; i < test_set.cnt; i++) {
147 bool found = false;
148
149 for (j = 0; j < ARRAY_SIZE(test_symbols); j++) {
150 if (test_symbols[j].id != test_set.ids[i])
151 continue;
152 found = true;
153 break;
154 }
155
156 ret = CHECK(!found, "id_check",
157 "ID %d not found in test_symbols\n",
158 test_set.ids[i]);
159 if (ret)
160 break;
161
162 if (i > 0) {
163 if (!ASSERT_LE(test_set.ids[i - 1], test_set.ids[i], "sort_check"))
164 return;
165 }
166 }
167 }
168