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189 lines
5.1 KiB
189 lines
5.1 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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/* Copyright (c) 2018 Facebook */ |
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#ifndef _UAPI__LINUX_BTF_H__ |
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#define _UAPI__LINUX_BTF_H__ |
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#include <linux/types.h> |
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#define BTF_MAGIC 0xeB9F |
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#define BTF_VERSION 1 |
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struct btf_header { |
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__u16 magic; |
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__u8 version; |
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__u8 flags; |
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__u32 hdr_len; |
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/* All offsets are in bytes relative to the end of this header */ |
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__u32 type_off; /* offset of type section */ |
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__u32 type_len; /* length of type section */ |
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__u32 str_off; /* offset of string section */ |
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__u32 str_len; /* length of string section */ |
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}; |
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/* Max # of type identifier */ |
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#define BTF_MAX_TYPE 0x000fffff |
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/* Max offset into the string section */ |
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#define BTF_MAX_NAME_OFFSET 0x00ffffff |
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/* Max # of struct/union/enum members or func args */ |
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#define BTF_MAX_VLEN 0xffff |
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struct btf_type { |
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__u32 name_off; |
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/* "info" bits arrangement |
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* bits 0-15: vlen (e.g. # of struct's members) |
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* bits 16-23: unused |
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* bits 24-27: kind (e.g. int, ptr, array...etc) |
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* bits 28-30: unused |
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* bit 31: kind_flag, currently used by |
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* struct, union and fwd |
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*/ |
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__u32 info; |
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/* "size" is used by INT, ENUM, STRUCT, UNION and DATASEC. |
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* "size" tells the size of the type it is describing. |
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* |
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* "type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT, |
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* FUNC, FUNC_PROTO, VAR, DECL_TAG and TYPE_TAG. |
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* "type" is a type_id referring to another type. |
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*/ |
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union { |
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__u32 size; |
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__u32 type; |
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}; |
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}; |
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#define BTF_INFO_KIND(info) (((info) >> 24) & 0x1f) |
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#define BTF_INFO_VLEN(info) ((info) & 0xffff) |
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#define BTF_INFO_KFLAG(info) ((info) >> 31) |
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enum { |
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BTF_KIND_UNKN = 0, /* Unknown */ |
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BTF_KIND_INT = 1, /* Integer */ |
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BTF_KIND_PTR = 2, /* Pointer */ |
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BTF_KIND_ARRAY = 3, /* Array */ |
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BTF_KIND_STRUCT = 4, /* Struct */ |
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BTF_KIND_UNION = 5, /* Union */ |
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BTF_KIND_ENUM = 6, /* Enumeration */ |
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BTF_KIND_FWD = 7, /* Forward */ |
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BTF_KIND_TYPEDEF = 8, /* Typedef */ |
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BTF_KIND_VOLATILE = 9, /* Volatile */ |
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BTF_KIND_CONST = 10, /* Const */ |
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BTF_KIND_RESTRICT = 11, /* Restrict */ |
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BTF_KIND_FUNC = 12, /* Function */ |
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BTF_KIND_FUNC_PROTO = 13, /* Function Proto */ |
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BTF_KIND_VAR = 14, /* Variable */ |
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BTF_KIND_DATASEC = 15, /* Section */ |
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BTF_KIND_FLOAT = 16, /* Floating point */ |
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BTF_KIND_DECL_TAG = 17, /* Decl Tag */ |
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BTF_KIND_TYPE_TAG = 18, /* Type Tag */ |
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NR_BTF_KINDS, |
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BTF_KIND_MAX = NR_BTF_KINDS - 1, |
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}; |
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/* For some specific BTF_KIND, "struct btf_type" is immediately |
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* followed by extra data. |
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*/ |
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/* BTF_KIND_INT is followed by a u32 and the following |
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* is the 32 bits arrangement: |
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*/ |
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#define BTF_INT_ENCODING(VAL) (((VAL) & 0x0f000000) >> 24) |
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#define BTF_INT_OFFSET(VAL) (((VAL) & 0x00ff0000) >> 16) |
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#define BTF_INT_BITS(VAL) ((VAL) & 0x000000ff) |
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/* Attributes stored in the BTF_INT_ENCODING */ |
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#define BTF_INT_SIGNED (1 << 0) |
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#define BTF_INT_CHAR (1 << 1) |
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#define BTF_INT_BOOL (1 << 2) |
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/* BTF_KIND_ENUM is followed by multiple "struct btf_enum". |
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* The exact number of btf_enum is stored in the vlen (of the |
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* info in "struct btf_type"). |
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*/ |
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struct btf_enum { |
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__u32 name_off; |
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__s32 val; |
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}; |
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/* BTF_KIND_ARRAY is followed by one "struct btf_array" */ |
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struct btf_array { |
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__u32 type; |
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__u32 index_type; |
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__u32 nelems; |
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}; |
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/* BTF_KIND_STRUCT and BTF_KIND_UNION are followed |
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* by multiple "struct btf_member". The exact number |
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* of btf_member is stored in the vlen (of the info in |
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* "struct btf_type"). |
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*/ |
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struct btf_member { |
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__u32 name_off; |
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__u32 type; |
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/* If the type info kind_flag is set, the btf_member offset |
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* contains both member bitfield size and bit offset. The |
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* bitfield size is set for bitfield members. If the type |
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* info kind_flag is not set, the offset contains only bit |
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* offset. |
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*/ |
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__u32 offset; |
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}; |
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/* If the struct/union type info kind_flag is set, the |
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* following two macros are used to access bitfield_size |
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* and bit_offset from btf_member.offset. |
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*/ |
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#define BTF_MEMBER_BITFIELD_SIZE(val) ((val) >> 24) |
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#define BTF_MEMBER_BIT_OFFSET(val) ((val) & 0xffffff) |
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/* BTF_KIND_FUNC_PROTO is followed by multiple "struct btf_param". |
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* The exact number of btf_param is stored in the vlen (of the |
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* info in "struct btf_type"). |
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*/ |
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struct btf_param { |
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__u32 name_off; |
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__u32 type; |
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}; |
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enum { |
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BTF_VAR_STATIC = 0, |
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BTF_VAR_GLOBAL_ALLOCATED = 1, |
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BTF_VAR_GLOBAL_EXTERN = 2, |
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}; |
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enum btf_func_linkage { |
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BTF_FUNC_STATIC = 0, |
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BTF_FUNC_GLOBAL = 1, |
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BTF_FUNC_EXTERN = 2, |
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}; |
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/* BTF_KIND_VAR is followed by a single "struct btf_var" to describe |
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* additional information related to the variable such as its linkage. |
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*/ |
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struct btf_var { |
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__u32 linkage; |
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}; |
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/* BTF_KIND_DATASEC is followed by multiple "struct btf_var_secinfo" |
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* to describe all BTF_KIND_VAR types it contains along with it's |
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* in-section offset as well as size. |
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*/ |
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struct btf_var_secinfo { |
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__u32 type; |
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__u32 offset; |
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__u32 size; |
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}; |
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/* BTF_KIND_DECL_TAG is followed by a single "struct btf_decl_tag" to describe |
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* additional information related to the tag applied location. |
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* If component_idx == -1, the tag is applied to a struct, union, |
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* variable or function. Otherwise, it is applied to a struct/union |
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* member or a func argument, and component_idx indicates which member |
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* or argument (0 ... vlen-1). |
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*/ |
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struct btf_decl_tag { |
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__s32 component_idx; |
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}; |
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#endif /* _UAPI__LINUX_BTF_H__ */
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