| // SPDX-License-Identifier: GPL-2.0 | |
| /* Copyright (c) 2020 Facebook */ | |
| #include <test_progs.h> | |
| #include <bpf/btf.h> | |
| static char *dump_buf; | |
| static size_t dump_buf_sz; | |
| static FILE *dump_buf_file; | |
| static void btf_dump_printf(void *ctx, const char *fmt, va_list args) | |
| { | |
| vfprintf(ctx, fmt, args); | |
| } | |
| /* Write raw BTF to file, return number of bytes written or negative errno */ | |
| static ssize_t btf_raw_write(struct btf *btf, char *file) | |
| { | |
| ssize_t written = 0; | |
| const void *data; | |
| __u32 size = 0; | |
| int fd, ret; | |
| fd = mkstemp(file); | |
| if (!ASSERT_GE(fd, 0, "create_file")) | |
| return -errno; | |
| data = btf__raw_data(btf, &size); | |
| if (!ASSERT_OK_PTR(data, "btf__raw_data")) { | |
| close(fd); | |
| return -EINVAL; | |
| } | |
| while (written < size) { | |
| ret = write(fd, data + written, size - written); | |
| if (!ASSERT_GE(ret, 0, "write succeeded")) { | |
| close(fd); | |
| return -errno; | |
| } | |
| written += ret; | |
| } | |
| close(fd); | |
| return written; | |
| } | |
| static void __test_btf_split(bool multi) | |
| { | |
| char multisplit_btf_file[] = "/tmp/test_btf_multisplit.XXXXXX"; | |
| char split_btf_file[] = "/tmp/test_btf_split.XXXXXX"; | |
| char base_btf_file[] = "/tmp/test_btf_base.XXXXXX"; | |
| ssize_t multisplit_btf_sz = 0, split_btf_sz = 0, base_btf_sz = 0; | |
| struct btf_dump *d = NULL; | |
| const struct btf_type *t, *ot; | |
| struct btf *btf1 = NULL, *btf2 = NULL, *btf3 = NULL; | |
| struct btf *btf4 = NULL, *btf5 = NULL, *btf6 = NULL; | |
| int str_off, i, err; | |
| btf1 = btf__new_empty(); | |
| if (!ASSERT_OK_PTR(btf1, "empty_main_btf")) | |
| return; | |
| btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */ | |
| btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */ | |
| btf__add_ptr(btf1, 1); /* [2] ptr to int */ | |
| btf__add_struct(btf1, "s1", 4); /* [3] struct s1 { */ | |
| btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */ | |
| /* } */ | |
| btf2 = btf__new_empty_split(btf1); | |
| if (!ASSERT_OK_PTR(btf2, "empty_split_btf")) | |
| goto cleanup; | |
| /* pointer size should be "inherited" from main BTF */ | |
| ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz"); | |
| str_off = btf__find_str(btf2, "int"); | |
| ASSERT_NEQ(str_off, -ENOENT, "str_int_missing"); | |
| t = btf__type_by_id(btf2, 1); | |
| if (!ASSERT_OK_PTR(t, "int_type")) | |
| goto cleanup; | |
| ASSERT_EQ(btf_is_int(t), true, "int_kind"); | |
| ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name"); | |
| btf__add_struct(btf2, "s2", 16); /* [4] struct s2 { */ | |
| btf__add_field(btf2, "f1", 3, 0, 0); /* struct s1 f1; */ | |
| btf__add_field(btf2, "f2", 1, 32, 0); /* int f2; */ | |
| btf__add_field(btf2, "f3", 2, 64, 0); /* int *f3; */ | |
| /* } */ | |
| t = btf__type_by_id(btf1, 4); | |
| ASSERT_NULL(t, "split_type_in_main"); | |
| t = btf__type_by_id(btf2, 4); | |
| if (!ASSERT_OK_PTR(t, "split_struct_type")) | |
| goto cleanup; | |
| ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind"); | |
| ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen"); | |
| ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name"); | |
| if (multi) { | |
| btf3 = btf__new_empty_split(btf2); | |
| if (!ASSERT_OK_PTR(btf3, "multi_split_btf")) | |
| goto cleanup; | |
| } else { | |
| btf3 = btf2; | |
| } | |
| btf__add_union(btf3, "u1", 16); /* [5] union u1 { */ | |
| btf__add_field(btf3, "f1", 4, 0, 0); /* struct s2 f1; */ | |
| btf__add_field(btf3, "uf2", 1, 0, 0); /* int f2; */ | |
| /* } */ | |
| if (multi) { | |
| t = btf__type_by_id(btf2, 5); | |
| ASSERT_NULL(t, "multisplit_type_in_first_split"); | |
| } | |
| t = btf__type_by_id(btf3, 5); | |
| if (!ASSERT_OK_PTR(t, "split_union_type")) | |
| goto cleanup; | |
| ASSERT_EQ(btf_is_union(t), true, "split_union_kind"); | |
| ASSERT_EQ(btf_vlen(t), 2, "split_union_vlen"); | |
| ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "u1", "split_union_name"); | |
| ASSERT_EQ(btf__type_cnt(btf3), 6, "split_type_cnt"); | |
| t = btf__type_by_id(btf3, 1); | |
| if (!ASSERT_OK_PTR(t, "split_base_type")) | |
| goto cleanup; | |
| ASSERT_EQ(btf_is_int(t), true, "split_base_int"); | |
| ASSERT_STREQ(btf__str_by_offset(btf3, t->name_off), "int", "split_base_type_name"); | |
| /* BTF-to-C dump of split BTF */ | |
| dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz); | |
| if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream")) | |
| return; | |
| d = btf_dump__new(btf3, btf_dump_printf, dump_buf_file, NULL); | |
| if (!ASSERT_OK_PTR(d, "btf_dump__new")) | |
| goto cleanup; | |
| for (i = 1; i < btf__type_cnt(btf3); i++) { | |
| err = btf_dump__dump_type(d, i); | |
| ASSERT_OK(err, "dump_type_ok"); | |
| } | |
| fflush(dump_buf_file); | |
| dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */ | |
| ASSERT_STREQ(dump_buf, | |
| "struct s1 {\n" | |
| " int f1;\n" | |
| "};\n\n" | |
| "struct s2 {\n" | |
| " struct s1 f1;\n" | |
| " int f2;\n" | |
| " int *f3;\n" | |
| "};\n\n" | |
| "union u1 {\n" | |
| " struct s2 f1;\n" | |
| " int uf2;\n" | |
| "};\n\n", "c_dump"); | |
| /* write base, split BTFs to files and ensure parsing succeeds */ | |
| base_btf_sz = btf_raw_write(btf1, base_btf_file); | |
| if (base_btf_sz < 0) | |
| goto cleanup; | |
| split_btf_sz = btf_raw_write(btf2, split_btf_file); | |
| if (split_btf_sz < 0) | |
| goto cleanup; | |
| btf4 = btf__parse(base_btf_file, NULL); | |
| if (!ASSERT_OK_PTR(btf4, "parse_base")) | |
| goto cleanup; | |
| btf5 = btf__parse_split(split_btf_file, btf4); | |
| if (!ASSERT_OK_PTR(btf5, "parse_split")) | |
| goto cleanup; | |
| if (multi) { | |
| multisplit_btf_sz = btf_raw_write(btf3, multisplit_btf_file); | |
| if (multisplit_btf_sz < 0) | |
| goto cleanup; | |
| btf6 = btf__parse_split(multisplit_btf_file, btf5); | |
| if (!ASSERT_OK_PTR(btf6, "parse_multisplit")) | |
| goto cleanup; | |
| } else { | |
| btf6 = btf5; | |
| } | |
| if (!ASSERT_EQ(btf__type_cnt(btf3), btf__type_cnt(btf6), "cmp_type_cnt")) | |
| goto cleanup; | |
| /* compare parsed to original BTF */ | |
| for (i = 1; i < btf__type_cnt(btf6); i++) { | |
| t = btf__type_by_id(btf6, i); | |
| if (!ASSERT_OK_PTR(t, "type_in_parsed_btf")) | |
| goto cleanup; | |
| ot = btf__type_by_id(btf3, i); | |
| if (!ASSERT_OK_PTR(ot, "type_in_orig_btf")) | |
| goto cleanup; | |
| if (!ASSERT_EQ(memcmp(t, ot, sizeof(*ot)), 0, "cmp_parsed_orig_btf")) | |
| goto cleanup; | |
| } | |
| cleanup: | |
| if (dump_buf_file) | |
| fclose(dump_buf_file); | |
| free(dump_buf); | |
| btf_dump__free(d); | |
| btf__free(btf1); | |
| btf__free(btf2); | |
| if (btf2 != btf3) | |
| btf__free(btf3); | |
| btf__free(btf4); | |
| btf__free(btf5); | |
| if (btf5 != btf6) | |
| btf__free(btf6); | |
| if (base_btf_sz > 0) | |
| unlink(base_btf_file); | |
| if (split_btf_sz > 0) | |
| unlink(split_btf_file); | |
| if (multisplit_btf_sz > 0) | |
| unlink(multisplit_btf_file); | |
| } | |
| void test_btf_split(void) | |
| { | |
| if (test__start_subtest("single_split")) | |
| __test_btf_split(false); | |
| if (test__start_subtest("multi_split")) | |
| __test_btf_split(true); | |
| } |