167 lines
4.6 KiB
C
167 lines
4.6 KiB
C
/* 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
|
|
|
|
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 */
|
|
};
|
|
|
|
/* Max # of type identifier */
|
|
#define BTF_MAX_TYPE 0x000fffff
|
|
/* Max offset into the string section */
|
|
#define BTF_MAX_NAME_OFFSET 0x00ffffff
|
|
/* Max # of struct/union/enum members or func args */
|
|
#define BTF_MAX_VLEN 0xffff
|
|
|
|
struct btf_type {
|
|
__u32 name_off;
|
|
/* "info" bits arrangement
|
|
* bits 0-15: vlen (e.g. # of struct's members)
|
|
* bits 16-23: unused
|
|
* bits 24-27: kind (e.g. int, ptr, array...etc)
|
|
* bits 28-30: unused
|
|
* bit 31: kind_flag, currently used by
|
|
* struct, union and fwd
|
|
*/
|
|
__u32 info;
|
|
/* "size" is used by INT, ENUM, STRUCT, UNION and DATASEC.
|
|
* "size" tells the size of the type it is describing.
|
|
*
|
|
* "type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT,
|
|
* FUNC, FUNC_PROTO and VAR.
|
|
* "type" is a type_id referring to another type.
|
|
*/
|
|
union {
|
|
__u32 size;
|
|
__u32 type;
|
|
};
|
|
};
|
|
|
|
#define BTF_INFO_KIND(info) (((info) >> 24) & 0x0f)
|
|
#define BTF_INFO_VLEN(info) ((info) & 0xffff)
|
|
#define BTF_INFO_KFLAG(info) ((info) >> 31)
|
|
|
|
#define BTF_KIND_UNKN 0 /* Unknown */
|
|
#define BTF_KIND_INT 1 /* Integer */
|
|
#define BTF_KIND_PTR 2 /* Pointer */
|
|
#define BTF_KIND_ARRAY 3 /* Array */
|
|
#define BTF_KIND_STRUCT 4 /* Struct */
|
|
#define BTF_KIND_UNION 5 /* Union */
|
|
#define BTF_KIND_ENUM 6 /* Enumeration */
|
|
#define BTF_KIND_FWD 7 /* Forward */
|
|
#define BTF_KIND_TYPEDEF 8 /* Typedef */
|
|
#define BTF_KIND_VOLATILE 9 /* Volatile */
|
|
#define BTF_KIND_CONST 10 /* Const */
|
|
#define BTF_KIND_RESTRICT 11 /* Restrict */
|
|
#define BTF_KIND_FUNC 12 /* Function */
|
|
#define BTF_KIND_FUNC_PROTO 13 /* Function Proto */
|
|
#define BTF_KIND_VAR 14 /* Variable */
|
|
#define BTF_KIND_DATASEC 15 /* Section */
|
|
#define BTF_KIND_MAX BTF_KIND_DATASEC
|
|
#define NR_BTF_KINDS (BTF_KIND_MAX + 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,
|
|
};
|
|
|
|
/* 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;
|
|
};
|
|
|
|
#endif /* _UAPI__LINUX_BTF_H__ */
|