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libbpf: Add support for field size relocations

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Add bpf_core_field_size() macro, capturing a relocation against field size.
Adjust bits of internal libbpf relocation logic to allow capturing size
relocations of various field types: arrays, structs/unions, enums, etc.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191101222810.1246166-4-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-11-01 15:28:08 -07:00
committed by Andrii Nakryiko
parent 4438972ccc
commit df45cf7a3e
2 changed files with 39 additions and 8 deletions
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7
src/bpf_core_read.h
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@@ -96,6 +96,13 @@ enum bpf_field_info_kind {
#define bpf_core_field_exists(field) \
__builtin_preserve_field_info(field, BPF_FIELD_EXISTS)
/*
* Convenience macro to get byte size of a field. Works for integers,
* struct/unions, pointers, arrays, and enums.
*/
#define bpf_core_field_size(field) \
__builtin_preserve_field_info(field, BPF_FIELD_BYTE_SIZE)
/*
* bpf_core_read() abstracts away bpf_probe_read() call and captures offset
* relocation for source address using __builtin_preserve_access_index()