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libbpf: Support creating light skeleton of either endianness

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Track target endianness in 'struct bpf_gen' and process in-memory data in
native byte-order, but on finalization convert the embedded loader BPF
insns to target endianness.

The light skeleton also includes a target-accessed data blob which is
heterogeneous and thus difficult to convert to target byte-order on
finalization. Add support functions to convert data to target endianness
as it is added to the blob.

Also add additional debug logging for data blob structure details and
skeleton loading.

Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/569562e1d5bf1cce80a1f1a3882461ee2da1ffd5.1726475448.git.tony.ambardar@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tony Ambardar
2024-09-16 01:37:46 -07:00
committed by Andrii Nakryiko
parent 6ac8762ecd
commit 8244006267
4 changed files with 137 additions and 51 deletions
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src/bpf_gen_internal.h
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@@ -34,6 +34,7 @@ struct bpf_gen {
void *data_cur;
void *insn_start;
void *insn_cur;
bool swapped_endian;
ssize_t cleanup_label;
__u32 nr_progs;
__u32 nr_maps;