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// 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)
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 != -1)
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.o", NULL);
if (CHECK(libbpf_get_error(btf), "resolve",
"Failed to load BTF from btf_data.o\n"))
return -1;
nr = btf__get_nr_types(btf);
for (type_id = 1; type_id <= nr; type_id++) {
if (__resolve_symbol(btf, type_id))
break;
}
btf__free(btf);
return 0;
}
int 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 -1;
/* 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 ret;
}
}
/* 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) {
ret = CHECK(test_set.ids[i - 1] > test_set.ids[i],
"sort_check",
"test_set is not sorted\n");
if (ret)
break;
}
}
return ret;
}
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