mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 02:05:20 +07:00
36fc3c8c28
This patch shrinks the BTF_INT_BITS() mask. The current
btf_int_check_meta() ensures the nr_bits of an integer
cannot exceed 64. Hence, it is mostly an uapi cleanup.
The actual btf usage (i.e. seq_show()) is also modified
to use u8 instead of u16. The verification (e.g. btf_int_check_meta())
path stays as is to deal with invalid BTF situation.
Fixes: 69b693f0ae ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
114 lines
3.0 KiB
C
114 lines
3.0 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 0x0000ffff
|
|
/* Max offset into the string section */
|
|
#define BTF_MAX_NAME_OFFSET 0x0000ffff
|
|
/* 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 28-31: unused
|
|
*/
|
|
__u32 info;
|
|
/* "size" is used by INT, ENUM, STRUCT and UNION.
|
|
* "size" tells the size of the type it is describing.
|
|
*
|
|
* "type" is used by PTR, TYPEDEF, VOLATILE, CONST and RESTRICT.
|
|
* "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_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_MAX 11
|
|
#define NR_BTF_KINDS 12
|
|
|
|
/* 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;
|
|
__u32 offset; /* offset in bits */
|
|
};
|
|
|
|
#endif /* _UAPI__LINUX_BTF_H__ */
|