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eb3f595d MKL |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* Copyright (c) 2018 Facebook */ | |
3 | ||
4 | #ifndef _LINUX_BTF_H | |
5 | #define _LINUX_BTF_H 1 | |
6 | ||
7 | #include <linux/types.h> | |
38207291 | 8 | #include <uapi/linux/btf.h> |
eb3f595d | 9 | |
85d33df3 MKL |
10 | #define BTF_TYPE_EMIT(type) ((void)(type *)0) |
11 | ||
eb3f595d | 12 | struct btf; |
ffa0c1cf | 13 | struct btf_member; |
eb3f595d | 14 | struct btf_type; |
f56a653c | 15 | union bpf_attr; |
eb3f595d | 16 | |
60197cfb MKL |
17 | extern const struct file_operations btf_fops; |
18 | ||
f56a653c MKL |
19 | void btf_put(struct btf *btf); |
20 | int btf_new_fd(const union bpf_attr *attr); | |
21 | struct btf *btf_get_by_fd(int fd); | |
60197cfb MKL |
22 | int btf_get_info_by_fd(const struct btf *btf, |
23 | const union bpf_attr *attr, | |
24 | union bpf_attr __user *uattr); | |
eb3f595d MKL |
25 | /* Figure out the size of a type_id. If type_id is a modifier |
26 | * (e.g. const), it will be resolved to find out the type with size. | |
27 | * | |
28 | * For example: | |
29 | * In describing "const void *", type_id is "const" and "const" | |
30 | * refers to "void *". The return type will be "void *". | |
31 | * | |
32 | * If type_id is a simple "int", then return type will be "int". | |
33 | * | |
34 | * @btf: struct btf object | |
35 | * @type_id: Find out the size of type_id. The type_id of the return | |
36 | * type is set to *type_id. | |
37 | * @ret_size: It can be NULL. If not NULL, the size of the return | |
38 | * type is set to *ret_size. | |
39 | * Return: The btf_type (resolved to another type with size info if needed). | |
40 | * NULL is returned if type_id itself does not have size info | |
41 | * (e.g. void) or it cannot be resolved to another type that | |
42 | * has size info. | |
43 | * *type_id and *ret_size will not be changed in the | |
44 | * NULL return case. | |
45 | */ | |
46 | const struct btf_type *btf_type_id_size(const struct btf *btf, | |
47 | u32 *type_id, | |
48 | u32 *ret_size); | |
b00b8dae MKL |
49 | void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj, |
50 | struct seq_file *m); | |
78958fca MKL |
51 | int btf_get_fd_by_id(u32 id); |
52 | u32 btf_id(const struct btf *btf); | |
ffa0c1cf YS |
53 | bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s, |
54 | const struct btf_member *m, | |
55 | u32 expected_offset, u32 expected_size); | |
d83525ca | 56 | int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t); |
2824ecb7 | 57 | bool btf_type_is_void(const struct btf_type *t); |
27ae7997 MKL |
58 | s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind); |
59 | const struct btf_type *btf_type_skip_modifiers(const struct btf *btf, | |
60 | u32 id, u32 *res_id); | |
61 | const struct btf_type *btf_type_resolve_ptr(const struct btf *btf, | |
62 | u32 id, u32 *res_id); | |
63 | const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf, | |
64 | u32 id, u32 *res_id); | |
85d33df3 MKL |
65 | const struct btf_type * |
66 | btf_resolve_size(const struct btf *btf, const struct btf_type *type, | |
6298399b | 67 | u32 *type_size); |
27ae7997 MKL |
68 | |
69 | #define for_each_member(i, struct_type, member) \ | |
70 | for (i = 0, member = btf_type_member(struct_type); \ | |
71 | i < btf_type_vlen(struct_type); \ | |
72 | i++, member++) | |
f6161a8f | 73 | |
38207291 MKL |
74 | static inline bool btf_type_is_ptr(const struct btf_type *t) |
75 | { | |
76 | return BTF_INFO_KIND(t->info) == BTF_KIND_PTR; | |
77 | } | |
78 | ||
79 | static inline bool btf_type_is_int(const struct btf_type *t) | |
80 | { | |
81 | return BTF_INFO_KIND(t->info) == BTF_KIND_INT; | |
82 | } | |
83 | ||
a9b59159 JF |
84 | static inline bool btf_type_is_small_int(const struct btf_type *t) |
85 | { | |
86 | return btf_type_is_int(t) && t->size <= sizeof(u64); | |
87 | } | |
88 | ||
38207291 MKL |
89 | static inline bool btf_type_is_enum(const struct btf_type *t) |
90 | { | |
91 | return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM; | |
92 | } | |
93 | ||
94 | static inline bool btf_type_is_typedef(const struct btf_type *t) | |
95 | { | |
96 | return BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF; | |
97 | } | |
98 | ||
99 | static inline bool btf_type_is_func(const struct btf_type *t) | |
100 | { | |
101 | return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC; | |
102 | } | |
103 | ||
104 | static inline bool btf_type_is_func_proto(const struct btf_type *t) | |
105 | { | |
106 | return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC_PROTO; | |
107 | } | |
108 | ||
27ae7997 MKL |
109 | static inline u16 btf_type_vlen(const struct btf_type *t) |
110 | { | |
111 | return BTF_INFO_VLEN(t->info); | |
112 | } | |
113 | ||
be8704ff AS |
114 | static inline u16 btf_func_linkage(const struct btf_type *t) |
115 | { | |
116 | return BTF_INFO_VLEN(t->info); | |
117 | } | |
118 | ||
27ae7997 MKL |
119 | static inline bool btf_type_kflag(const struct btf_type *t) |
120 | { | |
121 | return BTF_INFO_KFLAG(t->info); | |
122 | } | |
123 | ||
85d33df3 MKL |
124 | static inline u32 btf_member_bit_offset(const struct btf_type *struct_type, |
125 | const struct btf_member *member) | |
126 | { | |
127 | return btf_type_kflag(struct_type) ? BTF_MEMBER_BIT_OFFSET(member->offset) | |
128 | : member->offset; | |
129 | } | |
130 | ||
27ae7997 MKL |
131 | static inline u32 btf_member_bitfield_size(const struct btf_type *struct_type, |
132 | const struct btf_member *member) | |
133 | { | |
134 | return btf_type_kflag(struct_type) ? BTF_MEMBER_BITFIELD_SIZE(member->offset) | |
135 | : 0; | |
136 | } | |
137 | ||
138 | static inline const struct btf_member *btf_type_member(const struct btf_type *t) | |
139 | { | |
140 | return (const struct btf_member *)(t + 1); | |
141 | } | |
142 | ||
f6161a8f | 143 | #ifdef CONFIG_BPF_SYSCALL |
838e9690 YS |
144 | const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id); |
145 | const char *btf_name_by_offset(const struct btf *btf, u32 offset); | |
8580ac94 | 146 | struct btf *btf_parse_vmlinux(void); |
5b92a28a | 147 | struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog); |
f6161a8f YS |
148 | #else |
149 | static inline const struct btf_type *btf_type_by_id(const struct btf *btf, | |
150 | u32 type_id) | |
151 | { | |
152 | return NULL; | |
153 | } | |
154 | static inline const char *btf_name_by_offset(const struct btf *btf, | |
155 | u32 offset) | |
156 | { | |
157 | return NULL; | |
158 | } | |
159 | #endif | |
eb3f595d MKL |
160 | |
161 | #endif |