diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/lib/bpf/libbpf_internal.h | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h index f51444fc7eb7..5bfe85d4f8aa 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -110,7 +110,7 @@ struct btf_ext { }; struct btf_ext_info func_info; struct btf_ext_info line_info; - struct btf_ext_info offset_reloc_info; + struct btf_ext_info field_reloc_info; __u32 data_size; }; @@ -135,13 +135,23 @@ struct bpf_line_info_min { __u32 line_col; }; -/* The minimum bpf_offset_reloc checked by the loader +/* bpf_field_info_kind encodes which aspect of captured field has to be + * adjusted by relocations. Currently supported values are: + * - BPF_FIELD_BYTE_OFFSET: field offset (in bytes); + * - BPF_FIELD_EXISTS: field existence (1, if field exists; 0, otherwise); + */ +enum bpf_field_info_kind { + BPF_FIELD_BYTE_OFFSET = 0, /* field byte offset */ + BPF_FIELD_EXISTS = 2, /* field existence in target kernel */ +}; + +/* The minimum bpf_field_reloc checked by the loader * - * Offset relocation captures the following data: + * Field relocation captures the following data: * - insn_off - instruction offset (in bytes) within a BPF program that needs - * its insn->imm field to be relocated with actual offset; + * its insn->imm field to be relocated with actual field info; * - type_id - BTF type ID of the "root" (containing) entity of a relocatable - * offset; + * field; * - access_str_off - offset into corresponding .BTF string section. String * itself encodes an accessed field using a sequence of field and array * indicies, separated by colon (:). It's conceptually very close to LLVM's @@ -172,15 +182,16 @@ struct bpf_line_info_min { * bpf_probe_read(&dst, sizeof(dst), * __builtin_preserve_access_index(&src->a.b.c)); * - * In this case Clang will emit offset relocation recording necessary data to + * In this case Clang will emit field relocation recording necessary data to * be able to find offset of embedded `a.b.c` field within `src` struct. * * [0] https://llvm.org/docs/LangRef.html#getelementptr-instruction */ -struct bpf_offset_reloc { +struct bpf_field_reloc { __u32 insn_off; __u32 type_id; __u32 access_str_off; + enum bpf_field_info_kind kind; }; #endif /* __LIBBPF_LIBBPF_INTERNAL_H */ |