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-rw-r--r--tools/testing/selftests/bpf/prog_tests/resolve_btfids.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
new file mode 100644
index 000000000..6ace5e9ef
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
@@ -0,0 +1,172 @@
+// 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;
+}