projects / mirror_iproute2.git / blame
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|---|---|---|
| 50819791 DA |
1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| 2 | /* Copyright (c) 2018 Facebook */ | |
| 3 | #ifndef __LINUX_BTF_H__ | |
| 4 | #define __LINUX_BTF_H__ | |
| 5 | ||
| 6 | #include <linux/types.h> | |
| 7 | ||
| 8 | #define BTF_MAGIC 0xeB9F | |
| 9 | #define BTF_VERSION 1 | |
| 10 | ||
| 11 | struct btf_header { | |
| 12 | __u16 magic; | |
| 13 | __u8 version; | |
| 14 | __u8 flags; | |
| 15 | __u32 hdr_len; | |
| 16 | ||
| 17 | /* All offsets are in bytes relative to the end of this header */ | |
| 18 | __u32 type_off; /* offset of type section */ | |
| 19 | __u32 type_len; /* length of type section */ | |
| 20 | __u32 str_off; /* offset of string section */ | |
| 21 | __u32 str_len; /* length of string section */ | |
| 22 | }; | |
| 23 | ||
| 24 | /* Max # of type identifier */ | |
| 25 | #define BTF_MAX_TYPE 0x0000ffff | |
| 26 | /* Max offset into the string section */ | |
| 27 | #define BTF_MAX_NAME_OFFSET 0x0000ffff | |
| 28 | /* Max # of struct/union/enum members or func args */ | |
| 29 | #define BTF_MAX_VLEN 0xffff | |
| 30 | ||
| 31 | struct btf_type { | |
| 32 | __u32 name_off; | |
| 33 | /* "info" bits arrangement | |
| 34 | * bits 0-15: vlen (e.g. # of struct's members) | |
| 35 | * bits 16-23: unused | |
| 36 | * bits 24-27: kind (e.g. int, ptr, array...etc) | |
| 37 | * bits 28-31: unused | |
| 38 | */ | |
| 39 | __u32 info; | |
| 40 | /* "size" is used by INT, ENUM, STRUCT and UNION. | |
| 41 | * "size" tells the size of the type it is describing. | |
| 42 | * | |
| 43 | * "type" is used by PTR, TYPEDEF, VOLATILE, CONST and RESTRICT. | |
| 44 | * "type" is a type_id referring to another type. | |
| 45 | */ | |
| 46 | union { | |
| 47 | __u32 size; | |
| 48 | __u32 type; | |
| 49 | }; | |
| 50 | }; | |
| 51 | ||
| 52 | #define BTF_INFO_KIND(info) (((info) >> 24) & 0x0f) | |
| 53 | #define BTF_INFO_VLEN(info) ((info) & 0xffff) | |
| 54 | ||
| 55 | #define BTF_KIND_UNKN 0 /* Unknown */ | |
| 56 | #define BTF_KIND_INT 1 /* Integer */ | |
| 57 | #define BTF_KIND_PTR 2 /* Pointer */ | |
| 58 | #define BTF_KIND_ARRAY 3 /* Array */ | |
| 59 | #define BTF_KIND_STRUCT 4 /* Struct */ | |
| 60 | #define BTF_KIND_UNION 5 /* Union */ | |
| 61 | #define BTF_KIND_ENUM 6 /* Enumeration */ | |
| 62 | #define BTF_KIND_FWD 7 /* Forward */ | |
| 63 | #define BTF_KIND_TYPEDEF 8 /* Typedef */ | |
| 64 | #define BTF_KIND_VOLATILE 9 /* Volatile */ | |
| 65 | #define BTF_KIND_CONST 10 /* Const */ | |
| 66 | #define BTF_KIND_RESTRICT 11 /* Restrict */ | |
| 67 | #define BTF_KIND_MAX 11 | |
| 68 | #define NR_BTF_KINDS 12 | |
| 69 | ||
| 70 | /* For some specific BTF_KIND, "struct btf_type" is immediately | |
| 71 | * followed by extra data. | |
| 72 | */ | |
| 73 | ||
| 74 | /* BTF_KIND_INT is followed by a u32 and the following | |
| 75 | * is the 32 bits arrangement: | |
| 76 | */ | |
| 77 | #define BTF_INT_ENCODING(VAL) (((VAL) & 0x0f000000) >> 24) | |
| 78 | #define BTF_INT_OFFSET(VAL) (((VAL & 0x00ff0000)) >> 16) | |
| 74eb09ad | 79 | #define BTF_INT_BITS(VAL) ((VAL) & 0x000000ff) |
| 50819791 DA |
80 | |
| 81 | /* Attributes stored in the BTF_INT_ENCODING */ | |
| 82 | #define BTF_INT_SIGNED (1 << 0) | |
| 83 | #define BTF_INT_CHAR (1 << 1) | |
| 84 | #define BTF_INT_BOOL (1 << 2) | |
| 85 | ||
| 86 | /* BTF_KIND_ENUM is followed by multiple "struct btf_enum". | |
| 87 | * The exact number of btf_enum is stored in the vlen (of the | |
| 88 | * info in "struct btf_type"). | |
| 89 | */ | |
| 90 | struct btf_enum { | |
| 91 | __u32 name_off; | |
| 92 | __s32 val; | |
| 93 | }; | |
| 94 | ||
| 95 | /* BTF_KIND_ARRAY is followed by one "struct btf_array" */ | |
| 96 | struct btf_array { | |
| 97 | __u32 type; | |
| 98 | __u32 index_type; | |
| 99 | __u32 nelems; | |
| 100 | }; | |
| 101 | ||
| 102 | /* BTF_KIND_STRUCT and BTF_KIND_UNION are followed | |
| 103 | * by multiple "struct btf_member". The exact number | |
| 104 | * of btf_member is stored in the vlen (of the info in | |
| 105 | * "struct btf_type"). | |
| 106 | */ | |
| 107 | struct btf_member { | |
| 108 | __u32 name_off; | |
| 109 | __u32 type; | |
| 110 | __u32 offset; /* offset in bits */ | |
| 111 | }; | |
| 112 | ||
| 113 | #endif /* __LINUX_BTF_H__ */ |