/* SPDX-License-Identifier: GPL-2.0 *//* Copyright (c) 2018 Facebook */ #ifndef _LINUX_BTF_H#define _LINUX_BTF_H 1 #include <linux/types.h>#include <uapi/linux/btf.h> #define BTF_TYPE_EMIT(type) ((void)(type *)0) struct btf;struct btf_member;struct btf_type;union bpf_attr; extern const struct file_operations btf_fops; void btf_put(struct btf *btf);int btf_new_fd(const union bpf_attr *attr);struct btf *btf_get_by_fd(int fd);int btf_get_info_by_fd(const struct btf *btf,		       const union bpf_attr *attr,		       union bpf_attr __user *uattr);/* Figure out the size of a type_id.  If type_id is a modifier * (e.g. const), it will be resolved to find out the type with size. * * For example: * In describing "const void *",  type_id is "const" and "const" * refers to "void *".  The return type will be "void *". * * If type_id is a simple "int", then return type will be "int". * * @btf: struct btf object * @type_id: Find out the size of type_id. The type_id of the return *           type is set to *type_id. * @ret_size: It can be NULL.  If not NULL, the size of the return *            type is set to *ret_size. * Return: The btf_type (resolved to another type with size info if needed). *         NULL is returned if type_id itself does not have size info *         (e.g. void) or it cannot be resolved to another type that *         has size info. *         *type_id and *ret_size will not be changed in the *         NULL return case. */const struct btf_type *btf_type_id_size(const struct btf *btf,					u32 *type_id,					u32 *ret_size);void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,		       struct seq_file *m);int btf_get_fd_by_id(u32 id);u32 btf_id(const struct btf *btf);bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s,			   const struct btf_member *m,			   u32 expected_offset, u32 expected_size);int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t);bool btf_type_is_void(const struct btf_type *t);s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind);const struct btf_type *btf_type_skip_modifiers(const struct btf *btf,					       u32 id, u32 *res_id);const struct btf_type *btf_type_resolve_ptr(const struct btf *btf,					    u32 id, u32 *res_id);const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf,						 u32 id, u32 *res_id);const struct btf_type *btf_resolve_size(const struct btf *btf, const struct btf_type *type,		 u32 *type_size, const struct btf_type **elem_type,		 u32 *total_nelems); #define for_each_member(i, struct_type, member)			\	for (i = 0, member = btf_type_member(struct_type);	\	     i < btf_type_vlen(struct_type);			\	     i++, member++) static inline bool btf_type_is_ptr(const struct btf_type *t){	return BTF_INFO_KIND(t->info) == BTF_KIND_PTR;} static inline bool btf_type_is_int(const struct btf_type *t){	return BTF_INFO_KIND(t->info) == BTF_KIND_INT;} static inline bool btf_type_is_small_int(const struct btf_type *t){	return btf_type_is_int(t) && t->size <= sizeof(u64);} static inline bool btf_type_is_enum(const struct btf_type *t){	return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM;} static inline bool btf_type_is_typedef(const struct btf_type *t){	return BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF;} static inline bool btf_type_is_func(const struct btf_type *t){	return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC;} static inline bool btf_type_is_func_proto(const struct btf_type *t){	return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC_PROTO;} static inline u16 btf_type_vlen(const struct btf_type *t){	return BTF_INFO_VLEN(t->info);} static inline u16 btf_func_linkage(const struct btf_type *t){	return BTF_INFO_VLEN(t->info);} static inline bool btf_type_kflag(const struct btf_type *t){	return BTF_INFO_KFLAG(t->info);} static inline u32 btf_member_bit_offset(const struct btf_type *struct_type,					const struct btf_member *member){	return btf_type_kflag(struct_type) ? BTF_MEMBER_BIT_OFFSET(member->offset)					   : member->offset;} static inline u32 btf_member_bitfield_size(const struct btf_type *struct_type,					   const struct btf_member *member){	return btf_type_kflag(struct_type) ? BTF_MEMBER_BITFIELD_SIZE(member->offset)					   : 0;} static inline const struct btf_member *btf_type_member(const struct btf_type *t){	return (const struct btf_member *)(t + 1);} #ifdef CONFIG_BPF_SYSCALLconst struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);const char *btf_name_by_offset(const struct btf *btf, u32 offset);struct btf *btf_parse_vmlinux(void);struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);#elsestatic inline const struct btf_type *btf_type_by_id(const struct btf *btf,						    u32 type_id){	return NULL;}static inline const char *btf_name_by_offset(const struct btf *btf,					     u32 offset){	return NULL;}#endif #endif