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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support outdated 12-byte record size w/o breaking ABI.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 Andrii Nakryiko
parent 54aac21f7e
commit a3d02f9ab4
4 changed files with 40 additions and 29 deletions
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16
src/btf.c
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@@ -888,14 +888,14 @@ static int btf_ext_setup_line_info(struct btf_ext *btf_ext)
return btf_ext_setup_info(btf_ext, &param);
}
static int btf_ext_setup_offset_reloc(struct btf_ext *btf_ext)
static int btf_ext_setup_field_reloc(struct btf_ext *btf_ext)
{
struct btf_ext_sec_setup_param param = {
.off = btf_ext->hdr->offset_reloc_off,
.len = btf_ext->hdr->offset_reloc_len,
.min_rec_size = sizeof(struct bpf_offset_reloc),
.ext_info = &btf_ext->offset_reloc_info,
.desc = "offset_reloc",
.off = btf_ext->hdr->field_reloc_off,
.len = btf_ext->hdr->field_reloc_len,
.min_rec_size = sizeof(struct bpf_field_reloc),
.ext_info = &btf_ext->field_reloc_info,
.desc = "field_reloc",
};
return btf_ext_setup_info(btf_ext, &param);
@@ -975,9 +975,9 @@ struct btf_ext *btf_ext__new(__u8 *data, __u32 size)
goto done;
if (btf_ext->hdr->hdr_len <
offsetofend(struct btf_ext_header, offset_reloc_len))
offsetofend(struct btf_ext_header, field_reloc_len))
goto done;
err = btf_ext_setup_offset_reloc(btf_ext);
err = btf_ext_setup_field_reloc(btf_ext);
if (err)
goto done;