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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note *//* Copyright (c) 2018 Facebook */#ifndef _UAPI__LINUX_BTF_H__#define _UAPI__LINUX_BTF_H__
#include <linux/types.h>
#define BTF_MAGIC 0xeB9F#define BTF_VERSION 1
/* * BTF layout section consists of a struct btf_layout for each known * kind at BTF encoding time. */struct btf_layout { __u8 info_sz; /* size of singular element after btf_type */ __u8 elem_sz; /* size of each of btf_vlen(t) elements */ __u16 flags; /* currently unused */};
struct btf_header { __u16 magic; __u8 version; __u8 flags; __u32 hdr_len;
/* All offsets are in bytes relative to the end of this header */ __u32 type_off; /* offset of type section */ __u32 type_len; /* length of type section */ __u32 str_off; /* offset of string section */ __u32 str_len; /* length of string section */ __u32 layout_off; /* offset of layout section */ __u32 layout_len; /* length of layout section */};
enum btf_max { /* Max possible kind */ BTF_MAX_KIND = 0x0000007f, /* Max # of type identifier */ BTF_MAX_TYPE = 0x000fffff, /* Max offset into the string section */ BTF_MAX_NAME_OFFSET = 0x00ffffff, /* Max # of struct/union/enum members or func args */ BTF_MAX_VLEN = 0x00ffffff,};
struct btf_type { __u32 name_off; /* "info" bits arrangement * bits 0-23: vlen (e.g. # of struct's members) * bits 24-30: kind (e.g. int, ptr, array...etc) * bit 31: kind_flag, currently used by * struct, union, enum, fwd, enum64, * decl_tag and type_tag */ __u32 info; /* "size" is used by INT, ENUM, STRUCT, UNION, DATASEC and ENUM64. * "size" tells the size of the type it is describing. * * "type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT, * FUNC, FUNC_PROTO, VAR, DECL_TAG and TYPE_TAG. * "type" is a type_id referring to another type. */ union { __u32 size; __u32 type; };};
#define BTF_INFO_KIND(info) (((info) >> 24) & 0x7f)#define BTF_INFO_VLEN(info) ((info) & 0xffffff)#define BTF_INFO_KFLAG(info) ((info) >> 31)
enum { BTF_KIND_UNKN = 0, /* Unknown */ BTF_KIND_INT = 1, /* Integer */ BTF_KIND_PTR = 2, /* Pointer */ BTF_KIND_ARRAY = 3, /* Array */ BTF_KIND_STRUCT = 4, /* Struct */ BTF_KIND_UNION = 5, /* Union */ BTF_KIND_ENUM = 6, /* Enumeration up to 32-bit values */ BTF_KIND_FWD = 7, /* Forward */ BTF_KIND_TYPEDEF = 8, /* Typedef */ BTF_KIND_VOLATILE = 9, /* Volatile */ BTF_KIND_CONST = 10, /* Const */ BTF_KIND_RESTRICT = 11, /* Restrict */ BTF_KIND_FUNC = 12, /* Function */ BTF_KIND_FUNC_PROTO = 13, /* Function Proto */ BTF_KIND_VAR = 14, /* Variable */ BTF_KIND_DATASEC = 15, /* Section */ BTF_KIND_FLOAT = 16, /* Floating point */ BTF_KIND_DECL_TAG = 17, /* Decl Tag */ BTF_KIND_TYPE_TAG = 18, /* Type Tag */ BTF_KIND_ENUM64 = 19, /* Enumeration up to 64-bit values */
NR_BTF_KINDS, BTF_KIND_MAX = NR_BTF_KINDS - 1,};
/* For some specific BTF_KIND, "struct btf_type" is immediately * followed by extra data. */
/* BTF_KIND_INT is followed by a u32 and the following * is the 32 bits arrangement: */#define BTF_INT_ENCODING(VAL) (((VAL) & 0x0f000000) >> 24)#define BTF_INT_OFFSET(VAL) (((VAL) & 0x00ff0000) >> 16)#define BTF_INT_BITS(VAL) ((VAL) & 0x000000ff)
/* Attributes stored in the BTF_INT_ENCODING */#define BTF_INT_SIGNED (1 << 0)#define BTF_INT_CHAR (1 << 1)#define BTF_INT_BOOL (1 << 2)
/* BTF_KIND_ENUM is followed by multiple "struct btf_enum". * The exact number of btf_enum is stored in the vlen (of the * info in "struct btf_type"). */struct btf_enum { __u32 name_off; __s32 val;};
/* BTF_KIND_ARRAY is followed by one "struct btf_array" */struct btf_array { __u32 type; __u32 index_type; __u32 nelems;};
/* BTF_KIND_STRUCT and BTF_KIND_UNION are followed * by multiple "struct btf_member". The exact number * of btf_member is stored in the vlen (of the info in * "struct btf_type"). */struct btf_member { __u32 name_off; __u32 type; /* If the type info kind_flag is set, the btf_member offset * contains both member bitfield size and bit offset. The * bitfield size is set for bitfield members. If the type * info kind_flag is not set, the offset contains only bit * offset. */ __u32 offset;};
/* If the struct/union type info kind_flag is set, the * following two macros are used to access bitfield_size * and bit_offset from btf_member.offset. */#define BTF_MEMBER_BITFIELD_SIZE(val) ((val) >> 24)#define BTF_MEMBER_BIT_OFFSET(val) ((val) & 0xffffff)
/* BTF_KIND_FUNC_PROTO is followed by multiple "struct btf_param". * The exact number of btf_param is stored in the vlen (of the * info in "struct btf_type"). */struct btf_param { __u32 name_off; __u32 type;};
enum { BTF_VAR_STATIC = 0, BTF_VAR_GLOBAL_ALLOCATED = 1, BTF_VAR_GLOBAL_EXTERN = 2,};
enum btf_func_linkage { BTF_FUNC_STATIC = 0, BTF_FUNC_GLOBAL = 1, BTF_FUNC_EXTERN = 2,};
/* BTF_KIND_VAR is followed by a single "struct btf_var" to describe * additional information related to the variable such as its linkage. */struct btf_var { __u32 linkage;};
/* BTF_KIND_DATASEC is followed by multiple "struct btf_var_secinfo" * to describe all BTF_KIND_VAR types it contains along with it's * in-section offset as well as size. */struct btf_var_secinfo { __u32 type; __u32 offset; __u32 size;};
/* BTF_KIND_DECL_TAG is followed by a single "struct btf_decl_tag" to describe * additional information related to the tag applied location. * If component_idx == -1, the tag is applied to a struct, union, * variable or function. Otherwise, it is applied to a struct/union * member or a func argument, and component_idx indicates which member * or argument (0 ... vlen-1). */struct btf_decl_tag { __s32 component_idx;};
/* BTF_KIND_ENUM64 is followed by multiple "struct btf_enum64". * The exact number of btf_enum64 is stored in the vlen (of the * info in "struct btf_type"). */struct btf_enum64 { __u32 name_off; __u32 val_lo32; __u32 val_hi32;};
#endif /* _UAPI__LINUX_BTF_H__ */