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233 lines
7.0 KiB
233 lines
7.0 KiB
/* 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_get(struct btf *btf); |
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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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int btf_type_seq_show_flags(const struct btf *btf, u32 type_id, void *obj, |
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struct seq_file *m, u64 flags); |
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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_obj_id(const struct btf *btf); |
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bool btf_is_kernel(const struct btf *btf); |
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bool btf_is_module(const struct btf *btf); |
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struct module *btf_try_get_module(const struct btf *btf); |
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u32 btf_nr_types(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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#define for_each_vsi(i, datasec_type, member) \ |
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for (i = 0, member = btf_type_var_secinfo(datasec_type); \ |
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i < btf_type_vlen(datasec_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 bool btf_type_is_var(const struct btf_type *t) |
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{ |
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return BTF_INFO_KIND(t->info) == BTF_KIND_VAR; |
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} |
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/* union is only a special case of struct: |
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* all its offsetof(member) == 0 |
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*/ |
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static inline bool btf_type_is_struct(const struct btf_type *t) |
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{ |
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u8 kind = BTF_INFO_KIND(t->info); |
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return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION; |
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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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static inline const struct btf_var_secinfo *btf_type_var_secinfo( |
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const struct btf_type *t) |
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{ |
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return (const struct btf_var_secinfo *)(t + 1); |
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} |
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#ifdef CONFIG_BPF_SYSCALL |
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struct bpf_prog; |
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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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