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
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/err.h>
#include <string.h>
#include <bpf/btf.h>
#include <bpf/libbpf.h>
#include <linux/btf.h>
#include <linux/kernel.h>
#define CONFIG_DEBUG_INFO_BTF
#include <linux/btf_ids.h>
#include "test_progs.h"
static int duration;
struct symbol {
const char *name;
int type;
int id;
};
struct symbol test_symbols[] = {
{ "unused", BTF_KIND_UNKN, 0 },
{ "S", BTF_KIND_TYPEDEF, -1 },
{ "T", BTF_KIND_TYPEDEF, -1 },
{ "U", BTF_KIND_TYPEDEF, -1 },
{ "S", BTF_KIND_STRUCT, -1 },
{ "U", BTF_KIND_UNION, -1 },
{ "func", BTF_KIND_FUNC, -1 },
};
/* Align the .BTF_ids section to 4 bytes */
asm (
".pushsection " BTF_IDS_SECTION " ,\"a\"; \n"
".balign 4, 0; \n"
".popsection; \n");
BTF_ID_LIST(test_list_local)
BTF_ID_UNUSED
BTF_ID(typedef, S)
BTF_ID(typedef, T)
BTF_ID(typedef, U)
BTF_ID(struct, S)
BTF_ID(union, U)
BTF_ID(func, func)
extern __u32 test_list_global[];
BTF_ID_LIST_GLOBAL(test_list_global, 1)
BTF_ID_UNUSED
BTF_ID(typedef, S)
BTF_ID(typedef, T)
BTF_ID(typedef, U)
BTF_ID(struct, S)
BTF_ID(union, U)
BTF_ID(func, func)
BTF_SET_START(test_set)
BTF_ID(typedef, S)
BTF_ID(typedef, T)
BTF_ID(typedef, U)
BTF_ID(struct, S)
BTF_ID(union, U)
BTF_ID(func, func)
BTF_SET_END(test_set)
static int
__resolve_symbol(struct btf *btf, int type_id)
{
const struct btf_type *type;
const char *str;
unsigned int i;
type = btf__type_by_id(btf, type_id);
if (!type) {
PRINT_FAIL("Failed to get type for ID %d\n", type_id);
return -1;
}
for (i = 0; i < ARRAY_SIZE(test_symbols); i++) {
if (test_symbols[i].id >= 0)
continue;
if (BTF_INFO_KIND(type->info) != test_symbols[i].type)
continue;
str = btf__name_by_offset(btf, type->name_off);
if (!str) {
PRINT_FAIL("Failed to get name for BTF ID %d\n", type_id);
return -1;
}
if (!strcmp(str, test_symbols[i].name))
test_symbols[i].id = type_id;
}
return 0;
}
static int resolve_symbols(void)
{
struct btf *btf;
int type_id;
__u32 nr;
btf = btf__parse_elf("btf_data.bpf.o", NULL);
if (CHECK(libbpf_get_error(btf), "resolve",
"Failed to load BTF from btf_data.o\n"))
return -1;
nr = btf__type_cnt(btf);
for (type_id = 1; type_id < nr; type_id++) {
if (__resolve_symbol(btf, type_id))
break;
}
btf__free(btf);
return 0;
}
void test_resolve_btfids(void)
{
__u32 *test_list, *test_lists[] = { test_list_local, test_list_global };
unsigned int i, j;
int ret = 0;
if (resolve_symbols())
return;
/* Check BTF_ID_LIST(test_list_local) and
* BTF_ID_LIST_GLOBAL(test_list_global) IDs
*/
for (j = 0; j < ARRAY_SIZE(test_lists); j++) {
test_list = test_lists[j];
for (i = 0; i < ARRAY_SIZE(test_symbols); i++) {
ret = CHECK(test_list[i] != test_symbols[i].id,
"id_check",
"wrong ID for %s (%d != %d)\n",
test_symbols[i].name,
test_list[i], test_symbols[i].id);
if (ret)
return;
}
}
/* Check BTF_SET_START(test_set) IDs */
for (i = 0; i < test_set.cnt; i++) {
bool found = false;
for (j = 0; j < ARRAY_SIZE(test_symbols); j++) {
if (test_symbols[j].id != test_set.ids[i])
continue;
found = true;
break;
}
ret = CHECK(!found, "id_check",
"ID %d not found in test_symbols\n",
test_set.ids[i]);
if (ret)
break;
if (i > 0) {
if (!ASSERT_LE(test_set.ids[i - 1], test_set.ids[i], "sort_check"))
return;
}
}
}
|
