1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2018 Facebook */
7 #include <linux/types.h>
8 #include <uapi/linux/btf.h>
10 #define BTF_TYPE_EMIT(type) ((void)(type *)0)
17 extern const struct file_operations btf_fops;
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);
22 int btf_get_info_by_fd(const struct btf *btf,
23 const union bpf_attr *attr,
24 union bpf_attr __user *uattr);
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.
29 * In describing "const void *", type_id is "const" and "const"
30 * refers to "void *". The return type will be "void *".
32 * If type_id is a simple "int", then return type will be "int".
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
43 * *type_id and *ret_size will not be changed in the
46 const struct btf_type *btf_type_id_size(const struct btf *btf,
49 void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
51 int btf_get_fd_by_id(u32 id);
52 u32 btf_id(const struct btf *btf);
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);
56 int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t);
57 bool btf_type_is_void(const struct btf_type *t);
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,
61 const struct btf_type *btf_type_resolve_ptr(const struct btf *btf,
63 const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf,
65 const struct btf_type *
66 btf_resolve_size(const struct btf *btf, const struct btf_type *type,
67 u32 *type_size, const struct btf_type **elem_type,
70 #define for_each_member(i, struct_type, member) \
71 for (i = 0, member = btf_type_member(struct_type); \
72 i < btf_type_vlen(struct_type); \
75 static inline bool btf_type_is_ptr(const struct btf_type *t)
77 return BTF_INFO_KIND(t->info) == BTF_KIND_PTR;
80 static inline bool btf_type_is_int(const struct btf_type *t)
82 return BTF_INFO_KIND(t->info) == BTF_KIND_INT;
85 static inline bool btf_type_is_enum(const struct btf_type *t)
87 return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM;
90 static inline bool btf_type_is_typedef(const struct btf_type *t)
92 return BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF;
95 static inline bool btf_type_is_func(const struct btf_type *t)
97 return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC;
100 static inline bool btf_type_is_func_proto(const struct btf_type *t)
102 return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC_PROTO;
105 static inline u16 btf_type_vlen(const struct btf_type *t)
107 return BTF_INFO_VLEN(t->info);
110 static inline u16 btf_func_linkage(const struct btf_type *t)
112 return BTF_INFO_VLEN(t->info);
115 static inline bool btf_type_kflag(const struct btf_type *t)
117 return BTF_INFO_KFLAG(t->info);
120 static inline u32 btf_member_bit_offset(const struct btf_type *struct_type,
121 const struct btf_member *member)
123 return btf_type_kflag(struct_type) ? BTF_MEMBER_BIT_OFFSET(member->offset)
127 static inline u32 btf_member_bitfield_size(const struct btf_type *struct_type,
128 const struct btf_member *member)
130 return btf_type_kflag(struct_type) ? BTF_MEMBER_BITFIELD_SIZE(member->offset)
134 static inline const struct btf_member *btf_type_member(const struct btf_type *t)
136 return (const struct btf_member *)(t + 1);
139 #ifdef CONFIG_BPF_SYSCALL
140 const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);
141 const char *btf_name_by_offset(const struct btf *btf, u32 offset);
142 struct btf *btf_parse_vmlinux(void);
143 struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);
145 static inline const struct btf_type *btf_type_by_id(const struct btf *btf,
150 static inline const char *btf_name_by_offset(const struct btf *btf,