1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include <test_progs.h>
4 #include <bpf/btf.h>
5
6 static int duration = 0;
7
test_btf_write()8 void test_btf_write() {
9 const struct btf_var_secinfo *vi;
10 const struct btf_type *t;
11 const struct btf_member *m;
12 const struct btf_enum *v;
13 const struct btf_param *p;
14 struct btf *btf;
15 int id, err, str_off;
16
17 btf = btf__new_empty();
18 if (CHECK(IS_ERR(btf), "new_empty", "failed: %ld\n", PTR_ERR(btf)))
19 return;
20
21 str_off = btf__find_str(btf, "int");
22 ASSERT_EQ(str_off, -ENOENT, "int_str_missing_off");
23
24 str_off = btf__add_str(btf, "int");
25 ASSERT_EQ(str_off, 1, "int_str_off");
26
27 str_off = btf__find_str(btf, "int");
28 ASSERT_EQ(str_off, 1, "int_str_found_off");
29
30 /* BTF_KIND_INT */
31 id = btf__add_int(btf, "int", 4, BTF_INT_SIGNED);
32 ASSERT_EQ(id, 1, "int_id");
33
34 t = btf__type_by_id(btf, 1);
35 /* should re-use previously added "int" string */
36 ASSERT_EQ(t->name_off, str_off, "int_name_off");
37 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "int", "int_name");
38 ASSERT_EQ(btf_kind(t), BTF_KIND_INT, "int_kind");
39 ASSERT_EQ(t->size, 4, "int_sz");
40 ASSERT_EQ(btf_int_encoding(t), BTF_INT_SIGNED, "int_enc");
41 ASSERT_EQ(btf_int_bits(t), 32, "int_bits");
42
43 /* invalid int size */
44 id = btf__add_int(btf, "bad sz int", 7, 0);
45 ASSERT_ERR(id, "int_bad_sz");
46 /* invalid encoding */
47 id = btf__add_int(btf, "bad enc int", 4, 123);
48 ASSERT_ERR(id, "int_bad_enc");
49 /* NULL name */
50 id = btf__add_int(btf, NULL, 4, 0);
51 ASSERT_ERR(id, "int_bad_null_name");
52 /* empty name */
53 id = btf__add_int(btf, "", 4, 0);
54 ASSERT_ERR(id, "int_bad_empty_name");
55
56 /* PTR/CONST/VOLATILE/RESTRICT */
57 id = btf__add_ptr(btf, 1);
58 ASSERT_EQ(id, 2, "ptr_id");
59 t = btf__type_by_id(btf, 2);
60 ASSERT_EQ(btf_kind(t), BTF_KIND_PTR, "ptr_kind");
61 ASSERT_EQ(t->type, 1, "ptr_type");
62
63 id = btf__add_const(btf, 5); /* points forward to restrict */
64 ASSERT_EQ(id, 3, "const_id");
65 t = btf__type_by_id(btf, 3);
66 ASSERT_EQ(btf_kind(t), BTF_KIND_CONST, "const_kind");
67 ASSERT_EQ(t->type, 5, "const_type");
68
69 id = btf__add_volatile(btf, 3);
70 ASSERT_EQ(id, 4, "volatile_id");
71 t = btf__type_by_id(btf, 4);
72 ASSERT_EQ(btf_kind(t), BTF_KIND_VOLATILE, "volatile_kind");
73 ASSERT_EQ(t->type, 3, "volatile_type");
74
75 id = btf__add_restrict(btf, 4);
76 ASSERT_EQ(id, 5, "restrict_id");
77 t = btf__type_by_id(btf, 5);
78 ASSERT_EQ(btf_kind(t), BTF_KIND_RESTRICT, "restrict_kind");
79 ASSERT_EQ(t->type, 4, "restrict_type");
80
81 /* ARRAY */
82 id = btf__add_array(btf, 1, 2, 10); /* int *[10] */
83 ASSERT_EQ(id, 6, "array_id");
84 t = btf__type_by_id(btf, 6);
85 ASSERT_EQ(btf_kind(t), BTF_KIND_ARRAY, "array_kind");
86 ASSERT_EQ(btf_array(t)->index_type, 1, "array_index_type");
87 ASSERT_EQ(btf_array(t)->type, 2, "array_elem_type");
88 ASSERT_EQ(btf_array(t)->nelems, 10, "array_nelems");
89
90 /* STRUCT */
91 err = btf__add_field(btf, "field", 1, 0, 0);
92 ASSERT_ERR(err, "no_struct_field");
93 id = btf__add_struct(btf, "s1", 8);
94 ASSERT_EQ(id, 7, "struct_id");
95 err = btf__add_field(btf, "f1", 1, 0, 0);
96 ASSERT_OK(err, "f1_res");
97 err = btf__add_field(btf, "f2", 1, 32, 16);
98 ASSERT_OK(err, "f2_res");
99
100 t = btf__type_by_id(btf, 7);
101 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "s1", "struct_name");
102 ASSERT_EQ(btf_kind(t), BTF_KIND_STRUCT, "struct_kind");
103 ASSERT_EQ(btf_vlen(t), 2, "struct_vlen");
104 ASSERT_EQ(btf_kflag(t), true, "struct_kflag");
105 ASSERT_EQ(t->size, 8, "struct_sz");
106 m = btf_members(t) + 0;
107 ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
108 ASSERT_EQ(m->type, 1, "f1_type");
109 ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
110 ASSERT_EQ(btf_member_bitfield_size(t, 0), 0, "f1_bit_sz");
111 m = btf_members(t) + 1;
112 ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f2", "f2_name");
113 ASSERT_EQ(m->type, 1, "f2_type");
114 ASSERT_EQ(btf_member_bit_offset(t, 1), 32, "f2_bit_off");
115 ASSERT_EQ(btf_member_bitfield_size(t, 1), 16, "f2_bit_sz");
116
117 /* UNION */
118 id = btf__add_union(btf, "u1", 8);
119 ASSERT_EQ(id, 8, "union_id");
120
121 /* invalid, non-zero offset */
122 err = btf__add_field(btf, "field", 1, 1, 0);
123 ASSERT_ERR(err, "no_struct_field");
124
125 err = btf__add_field(btf, "f1", 1, 0, 16);
126 ASSERT_OK(err, "f1_res");
127
128 t = btf__type_by_id(btf, 8);
129 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "u1", "union_name");
130 ASSERT_EQ(btf_kind(t), BTF_KIND_UNION, "union_kind");
131 ASSERT_EQ(btf_vlen(t), 1, "union_vlen");
132 ASSERT_EQ(btf_kflag(t), true, "union_kflag");
133 ASSERT_EQ(t->size, 8, "union_sz");
134 m = btf_members(t) + 0;
135 ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
136 ASSERT_EQ(m->type, 1, "f1_type");
137 ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
138 ASSERT_EQ(btf_member_bitfield_size(t, 0), 16, "f1_bit_sz");
139
140 /* ENUM */
141 id = btf__add_enum(btf, "e1", 4);
142 ASSERT_EQ(id, 9, "enum_id");
143 err = btf__add_enum_value(btf, "v1", 1);
144 ASSERT_OK(err, "v1_res");
145 err = btf__add_enum_value(btf, "v2", 2);
146 ASSERT_OK(err, "v2_res");
147
148 t = btf__type_by_id(btf, 9);
149 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum_name");
150 ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_kind");
151 ASSERT_EQ(btf_vlen(t), 2, "enum_vlen");
152 ASSERT_EQ(t->size, 4, "enum_sz");
153 v = btf_enum(t) + 0;
154 ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v1", "v1_name");
155 ASSERT_EQ(v->val, 1, "v1_val");
156 v = btf_enum(t) + 1;
157 ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v2", "v2_name");
158 ASSERT_EQ(v->val, 2, "v2_val");
159
160 /* FWDs */
161 id = btf__add_fwd(btf, "struct_fwd", BTF_FWD_STRUCT);
162 ASSERT_EQ(id, 10, "struct_fwd_id");
163 t = btf__type_by_id(btf, 10);
164 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "struct_fwd", "fwd_name");
165 ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
166 ASSERT_EQ(btf_kflag(t), 0, "fwd_kflag");
167
168 id = btf__add_fwd(btf, "union_fwd", BTF_FWD_UNION);
169 ASSERT_EQ(id, 11, "union_fwd_id");
170 t = btf__type_by_id(btf, 11);
171 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "union_fwd", "fwd_name");
172 ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
173 ASSERT_EQ(btf_kflag(t), 1, "fwd_kflag");
174
175 id = btf__add_fwd(btf, "enum_fwd", BTF_FWD_ENUM);
176 ASSERT_EQ(id, 12, "enum_fwd_id");
177 t = btf__type_by_id(btf, 12);
178 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "enum_fwd", "fwd_name");
179 ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_fwd_kind");
180 ASSERT_EQ(btf_vlen(t), 0, "enum_fwd_kind");
181 ASSERT_EQ(t->size, 4, "enum_fwd_sz");
182
183 /* TYPEDEF */
184 id = btf__add_typedef(btf, "typedef1", 1);
185 ASSERT_EQ(id, 13, "typedef_fwd_id");
186 t = btf__type_by_id(btf, 13);
187 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "typedef1", "typedef_name");
188 ASSERT_EQ(btf_kind(t), BTF_KIND_TYPEDEF, "typedef_kind");
189 ASSERT_EQ(t->type, 1, "typedef_type");
190
191 /* FUNC & FUNC_PROTO */
192 id = btf__add_func(btf, "func1", BTF_FUNC_GLOBAL, 15);
193 ASSERT_EQ(id, 14, "func_id");
194 t = btf__type_by_id(btf, 14);
195 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "func1", "func_name");
196 ASSERT_EQ(t->type, 15, "func_type");
197 ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC, "func_kind");
198 ASSERT_EQ(btf_vlen(t), BTF_FUNC_GLOBAL, "func_vlen");
199
200 id = btf__add_func_proto(btf, 1);
201 ASSERT_EQ(id, 15, "func_proto_id");
202 err = btf__add_func_param(btf, "p1", 1);
203 ASSERT_OK(err, "p1_res");
204 err = btf__add_func_param(btf, "p2", 2);
205 ASSERT_OK(err, "p2_res");
206
207 t = btf__type_by_id(btf, 15);
208 ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC_PROTO, "func_proto_kind");
209 ASSERT_EQ(btf_vlen(t), 2, "func_proto_vlen");
210 ASSERT_EQ(t->type, 1, "func_proto_ret_type");
211 p = btf_params(t) + 0;
212 ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p1", "p1_name");
213 ASSERT_EQ(p->type, 1, "p1_type");
214 p = btf_params(t) + 1;
215 ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p2", "p2_name");
216 ASSERT_EQ(p->type, 2, "p2_type");
217
218 /* VAR */
219 id = btf__add_var(btf, "var1", BTF_VAR_GLOBAL_ALLOCATED, 1);
220 ASSERT_EQ(id, 16, "var_id");
221 t = btf__type_by_id(btf, 16);
222 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "var1", "var_name");
223 ASSERT_EQ(btf_kind(t), BTF_KIND_VAR, "var_kind");
224 ASSERT_EQ(t->type, 1, "var_type");
225 ASSERT_EQ(btf_var(t)->linkage, BTF_VAR_GLOBAL_ALLOCATED, "var_type");
226
227 /* DATASECT */
228 id = btf__add_datasec(btf, "datasec1", 12);
229 ASSERT_EQ(id, 17, "datasec_id");
230 err = btf__add_datasec_var_info(btf, 1, 4, 8);
231 ASSERT_OK(err, "v1_res");
232
233 t = btf__type_by_id(btf, 17);
234 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "datasec1", "datasec_name");
235 ASSERT_EQ(t->size, 12, "datasec_sz");
236 ASSERT_EQ(btf_kind(t), BTF_KIND_DATASEC, "datasec_kind");
237 ASSERT_EQ(btf_vlen(t), 1, "datasec_vlen");
238 vi = btf_var_secinfos(t) + 0;
239 ASSERT_EQ(vi->type, 1, "v1_type");
240 ASSERT_EQ(vi->offset, 4, "v1_off");
241 ASSERT_EQ(vi->size, 8, "v1_sz");
242
243 btf__free(btf);
244 }
245