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libbpf: Update BTF reloc support to latest Clang format

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BTF offset reloc was generalized in recent Clang into field relocation,
capturing extra u32 field, specifying what aspect of captured field
needs to be relocated. This changes .BTF.ext's record size for this
relocation from 12 bytes to 16 bytes. Given these format changes
happened in Clang before official released version, it's ok to not
support outdated 12-byte record size w/o breaking ABI.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191015182849.3922287-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-10-15 11:28:45 -07:00
committed by Alexei Starovoitov
parent 14f2cf607c
commit 511bb0085c
4 changed files with 40 additions and 29 deletions
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4
tools/lib/bpf/btf.h
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@@ -60,8 +60,8 @@ struct btf_ext_header {
__u32 line_info_len;
/* optional part of .BTF.ext header */
__u32 offset_reloc_off;
__u32 offset_reloc_len;
__u32 field_reloc_off;
__u32 field_reloc_len;
};
LIBBPF_API void btf__free(struct btf *btf);