emit_btf_ext_data
sz = emit_btf_ext_data(linker, cur, sec->sec_name, &sec->func_info);
sz = emit_btf_ext_data(linker, cur, sec->sec_name, &sec->line_info);
sz = emit_btf_ext_data(linker, cur, sec->sec_name, &sec->core_relo_info);