lib/bpf/linker.c

172 				 Elf64_Sym *sym, const char *sym_name, int src_sym_idx);
1246 	const char *sym_name;
1259 		sym_name = elf_strptr(obj->elf, str_sec_idx, sym->st_name);
1260 		if (!sym_name) {
1265 		err = linker_append_elf_sym(linker, obj, sym, sym_name, i);
1281 static struct glob_sym *find_glob_sym(struct bpf_linker *linker, const char *sym_name)
1291 		if (strcmp(name, sym_name) == 0)
1317 static bool glob_sym_btf_matches(const char *sym_name, bool exact,
1337 				sym_name, n1, n2);
1347 				sym_name, btf_kflag(t1) ? "union" : "struct", btf_kind_str(t2));
1354 				sym_name, btf_kflag(t2) ? "union" : "struct", btf_kind_str(t1));
1361 			sym_name, btf_kind_str(t1), btf_kind_str(t2));
1377 				sym_name, btf_kind_str(t1), n1, n2);
1396 				sym_name, btf_kind_str(t1), n1, t1->size, t2->size);
1419 			pr_warn("global '%s': incompatible func '%s' linkage\n", sym_name, n1);
1431 			pr_warn("global '%s': incompatible var '%s' linkage\n", sym_name, n1);
1447 				sym_name, btf_kind_str(t1), btf_vlen(t1), btf_vlen(t2));
1459 					sym_name, i, n1, n2);
1464 					sym_name, i, n1);
1467 			if (!glob_sym_btf_matches(sym_name, exact, btf1, m1->type, btf2, m2->type))
1478 				sym_name, btf_kind_str(t1), btf_vlen(t1), btf_vlen(t2));
1487 			if (!glob_sym_btf_matches(sym_name, exact, btf1, m1->type, btf2, m2->type))
1506 			sym_name, btf_kind_str(t1));
1511 static bool map_defs_match(const char *sym_name,
1536 	     && !glob_sym_btf_matches(sym_name, true /*exact*/,
1553 	     && !glob_sym_btf_matches(sym_name, true /*exact*/,
1585 		snprintf(inner_map_name, sizeof(inner_map_name), "%s.inner", sym_name);
1595 	pr_warn("global '%s': map %s mismatch\n", sym_name, reason);
1599 static bool glob_map_defs_match(const char *sym_name,
1610 		pr_warn("global '%s': invalid map definition type [%d]\n", sym_name, btf_id);
1615 	err = parse_btf_map_def(sym_name, obj->btf, t, true /*strict*/, &src_def, &src_inner_def);
1617 		pr_warn("global '%s': invalid map definition\n", sym_name);
1624 	err = parse_btf_map_def(sym_name, linker->btf, t, true /*strict*/, &dst_def, &dst_inner_def);
1627 		pr_warn("global '%s': invalid dst map definition\n", sym_name);
1635 	return map_defs_match(sym_name, linker->btf, &dst_def, &dst_inner_def,
1639 static bool glob_syms_match(const char *sym_name,
1649 		pr_warn("BTF info is missing for global symbol '%s'\n", sym_name);
1656 			btf_kind_str(src_t), sym_name);
1662 		return glob_map_defs_match(sym_name, linker, glob_sym, obj, sym, btf_id);
1664 	if (!glob_sym_btf_matches(sym_name, true /*exact*/,
1677 static int find_glob_sym_btf(struct src_obj *obj, Elf64_Sym *sym, const char *sym_name,
1699 			if (strcmp(name, sym_name) != 0)
1715 			if (strcmp(name, sym_name) != 0)
1724 					sym_name, btf_id, vi->type);
1742 	pr_warn("failed to find BTF info for global/extern symbol '%s'\n", sym_name);
1831 				 Elf64_Sym *sym, const char *sym_name, int src_sym_idx)
1869 	err = find_glob_sym_btf(obj, sym, sym_name, &btf_sec_id, &btf_id);
1896 	glob_sym = find_glob_sym(linker, sym_name);
1911 				src_sym_idx, sym_name, obj->filename);
1915 		if (!glob_syms_match(sym_name, linker, glob_sym, obj, sym, src_sym_idx, btf_id))
1983 	name_off = strset__add_str(linker->strtab_strs, sym_name);
2122 				   int sym_type, const char *sym_name)
2140 		if (strcmp(sym_name, name) != 0)