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libbpf: Add bpf_program__set_insns function

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Adding bpf_program__set_insns that allows to set new instructions
for a BPF program.

This is a very advanced libbpf API and users need to know what
they are doing. This should be used from prog_prepare_load_fn
callback only.

We can have changed instructions after calling prog_prepare_load_fn
callback, reloading them.

One of the users of this new API will be perf's internal BPF prologue
generation.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220510074659.2557731-2-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2022-05-10 09:46:57 +02:00
committed by Andrii Nakryiko
parent 7062757357
commit e335f3fa5f
3 changed files with 41 additions and 0 deletions
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@@ -449,6 +449,7 @@ LIBBPF_0.8.0 {
bpf_program__attach_kprobe_multi_opts;
bpf_program__attach_trace_opts;
bpf_program__attach_usdt;
bpf_program__set_insns;
libbpf_register_prog_handler;
libbpf_unregister_prog_handler;
} LIBBPF_0.7.0;