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223f903e9c
Patch set [1] introduced BTF_KIND_TAG to allow tagging declarations for struct/union, struct/union field, var, func and func arguments and these tags will be encoded into dwarf. They are also encoded to btf by llvm for the bpf target. After BTF_KIND_TAG is introduced, we intended to use it for kernel __user attributes. But kernel __user is actually a type attribute. Upstream and internal discussion showed it is not a good idea to mix declaration attribute and type attribute. So we proposed to introduce btf_type_tag as a type attribute and existing btf_tag renamed to btf_decl_tag ([2]). This patch renamed BTF_KIND_TAG to BTF_KIND_DECL_TAG and some other declarations with *_tag to *_decl_tag to make it clear the tag is for declaration. In the future, BTF_KIND_TYPE_TAG might be introduced per [3]. [1] https://lore.kernel.org/bpf/20210914223004.244411-1-yhs@fb.com/ [2] https://reviews.llvm.org/D111588 [3] https://reviews.llvm.org/D111199 Fixes:b5ea834dde("bpf: Support for new btf kind BTF_KIND_TAG") Fixes:5b84bd1036("libbpf: Add support for BTF_KIND_TAG") Fixes:5c07f2fec0("bpftool: Add support for BTF_KIND_TAG") Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211012164838.3345699-1-yhs@fb.com
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2019 Facebook */
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#ifndef _TEST_BTF_H
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#define _TEST_BTF_H
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#define BTF_INFO_ENC(kind, kind_flag, vlen) \
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((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
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#define BTF_TYPE_ENC(name, info, size_or_type) \
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(name), (info), (size_or_type)
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#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
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((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
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#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
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BTF_INT_ENC(encoding, bits_offset, bits)
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#define BTF_FWD_ENC(name, kind_flag) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FWD, kind_flag, 0), 0)
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#define BTF_ARRAY_ENC(type, index_type, nr_elems) \
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(type), (index_type), (nr_elems)
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#define BTF_TYPE_ARRAY_ENC(type, index_type, nr_elems) \
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BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_ARRAY, 0, 0), 0), \
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BTF_ARRAY_ENC(type, index_type, nr_elems)
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#define BTF_STRUCT_ENC(name, nr_elems, sz) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, nr_elems), sz)
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#define BTF_UNION_ENC(name, nr_elems, sz) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_UNION, 0, nr_elems), sz)
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#define BTF_VAR_ENC(name, type, linkage) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_VAR, 0, 0), type), (linkage)
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#define BTF_VAR_SECINFO_ENC(type, offset, size) \
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(type), (offset), (size)
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#define BTF_MEMBER_ENC(name, type, bits_offset) \
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(name), (type), (bits_offset)
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#define BTF_ENUM_ENC(name, val) (name), (val)
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#define BTF_MEMBER_OFFSET(bitfield_size, bits_offset) \
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((bitfield_size) << 24 | (bits_offset))
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#define BTF_TYPEDEF_ENC(name, type) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0), type)
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#define BTF_PTR_ENC(type) \
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BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_PTR, 0, 0), type)
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#define BTF_CONST_ENC(type) \
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BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_CONST, 0, 0), type)
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#define BTF_VOLATILE_ENC(type) \
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BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_VOLATILE, 0, 0), type)
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#define BTF_RESTRICT_ENC(type) \
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BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_RESTRICT, 0, 0), type)
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#define BTF_FUNC_PROTO_ENC(ret_type, nargs) \
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BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_FUNC_PROTO, 0, nargs), ret_type)
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#define BTF_FUNC_PROTO_ARG_ENC(name, type) \
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(name), (type)
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#define BTF_FUNC_ENC(name, func_proto) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FUNC, 0, 0), func_proto)
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#define BTF_TYPE_FLOAT_ENC(name, sz) \
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BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FLOAT, 0, 0), sz)
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#define BTF_DECL_TAG_ENC(value, type, component_idx) \
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BTF_TYPE_ENC(value, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), type), (component_idx)
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#endif /* _TEST_BTF_H */
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