199 lines
5.9 KiB
C
199 lines
5.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2018 Facebook */
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#ifndef _LINUX_BTF_H
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#define _LINUX_BTF_H 1
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#include <linux/types.h>
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#include <uapi/linux/btf.h>
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#include <uapi/linux/bpf.h>
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#define BTF_TYPE_EMIT(type) ((void)(type *)0)
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struct btf;
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struct btf_member;
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struct btf_type;
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union bpf_attr;
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struct btf_show;
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extern const struct file_operations btf_fops;
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void btf_put(struct btf *btf);
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int btf_new_fd(const union bpf_attr *attr);
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struct btf *btf_get_by_fd(int fd);
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int btf_get_info_by_fd(const struct btf *btf,
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const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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/* Figure out the size of a type_id. If type_id is a modifier
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* (e.g. const), it will be resolved to find out the type with size.
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*
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* For example:
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* In describing "const void *", type_id is "const" and "const"
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* refers to "void *". The return type will be "void *".
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*
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* If type_id is a simple "int", then return type will be "int".
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*
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* @btf: struct btf object
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* @type_id: Find out the size of type_id. The type_id of the return
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* type is set to *type_id.
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* @ret_size: It can be NULL. If not NULL, the size of the return
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* type is set to *ret_size.
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* Return: The btf_type (resolved to another type with size info if needed).
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* NULL is returned if type_id itself does not have size info
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* (e.g. void) or it cannot be resolved to another type that
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* has size info.
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* *type_id and *ret_size will not be changed in the
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* NULL return case.
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*/
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const struct btf_type *btf_type_id_size(const struct btf *btf,
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u32 *type_id,
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u32 *ret_size);
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/*
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* Options to control show behaviour.
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* - BTF_SHOW_COMPACT: no formatting around type information
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* - BTF_SHOW_NONAME: no struct/union member names/types
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* - BTF_SHOW_PTR_RAW: show raw (unobfuscated) pointer values;
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* equivalent to %px.
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* - BTF_SHOW_ZERO: show zero-valued struct/union members; they
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* are not displayed by default
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* - BTF_SHOW_UNSAFE: skip use of bpf_probe_read() to safely read
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* data before displaying it.
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*/
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#define BTF_SHOW_COMPACT BTF_F_COMPACT
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#define BTF_SHOW_NONAME BTF_F_NONAME
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#define BTF_SHOW_PTR_RAW BTF_F_PTR_RAW
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#define BTF_SHOW_ZERO BTF_F_ZERO
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#define BTF_SHOW_UNSAFE (1ULL << 4)
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void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
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struct seq_file *m);
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/*
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* Copy len bytes of string representation of obj of BTF type_id into buf.
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*
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* @btf: struct btf object
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* @type_id: type id of type obj points to
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* @obj: pointer to typed data
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* @buf: buffer to write to
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* @len: maximum length to write to buf
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* @flags: show options (see above)
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*
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* Return: length that would have been/was copied as per snprintf, or
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* negative error.
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*/
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int btf_type_snprintf_show(const struct btf *btf, u32 type_id, void *obj,
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char *buf, int len, u64 flags);
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int btf_get_fd_by_id(u32 id);
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u32 btf_id(const struct btf *btf);
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bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s,
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const struct btf_member *m,
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u32 expected_offset, u32 expected_size);
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int btf_find_spin_lock(const struct btf *btf, const struct btf_type *t);
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bool btf_type_is_void(const struct btf_type *t);
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s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind);
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const struct btf_type *btf_type_skip_modifiers(const struct btf *btf,
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u32 id, u32 *res_id);
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const struct btf_type *btf_type_resolve_ptr(const struct btf *btf,
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u32 id, u32 *res_id);
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const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf,
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u32 id, u32 *res_id);
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const struct btf_type *
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btf_resolve_size(const struct btf *btf, const struct btf_type *type,
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u32 *type_size);
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#define for_each_member(i, struct_type, member) \
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for (i = 0, member = btf_type_member(struct_type); \
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i < btf_type_vlen(struct_type); \
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i++, member++)
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static inline bool btf_type_is_ptr(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_PTR;
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}
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static inline bool btf_type_is_int(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_INT;
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}
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static inline bool btf_type_is_small_int(const struct btf_type *t)
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{
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return btf_type_is_int(t) && t->size <= sizeof(u64);
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}
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static inline bool btf_type_is_enum(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM;
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}
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static inline bool btf_type_is_typedef(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF;
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}
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static inline bool btf_type_is_func(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC;
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}
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static inline bool btf_type_is_func_proto(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC_PROTO;
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}
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static inline u16 btf_type_vlen(const struct btf_type *t)
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{
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return BTF_INFO_VLEN(t->info);
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}
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static inline u16 btf_func_linkage(const struct btf_type *t)
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{
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return BTF_INFO_VLEN(t->info);
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}
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static inline bool btf_type_kflag(const struct btf_type *t)
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{
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return BTF_INFO_KFLAG(t->info);
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}
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static inline u32 btf_member_bit_offset(const struct btf_type *struct_type,
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const struct btf_member *member)
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{
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return btf_type_kflag(struct_type) ? BTF_MEMBER_BIT_OFFSET(member->offset)
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: member->offset;
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}
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static inline u32 btf_member_bitfield_size(const struct btf_type *struct_type,
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const struct btf_member *member)
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{
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return btf_type_kflag(struct_type) ? BTF_MEMBER_BITFIELD_SIZE(member->offset)
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: 0;
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}
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static inline const struct btf_member *btf_type_member(const struct btf_type *t)
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{
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return (const struct btf_member *)(t + 1);
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}
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#ifdef CONFIG_BPF_SYSCALL
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const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);
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const char *btf_name_by_offset(const struct btf *btf, u32 offset);
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struct btf *btf_parse_vmlinux(void);
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struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);
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#else
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static inline const struct btf_type *btf_type_by_id(const struct btf *btf,
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u32 type_id)
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{
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return NULL;
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}
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static inline const char *btf_name_by_offset(const struct btf *btf,
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u32 offset)
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{
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return NULL;
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}
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#endif
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#endif
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