bpf: support bpf_get_func_arg() for BPF_TRACE_RAW_TP

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For now, bpf_get_func_arg() and bpf_get_func_arg_cnt() is not supported by
the BPF_TRACE_RAW_TP, which is not convenient to get the argument of the
tracepoint, especially for the case that the position of the arguments in
a tracepoint can change.

The target tracepoint BTF type id is specified during loading time,
therefore we can get the function argument count from the function
prototype instead of the stack.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20260121044348.113201-2-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Menglong Dong 2026-01-21 12:43:47 +08:00 • committed by Alexei Starovoitov

parent ba335bf3a5

commit 85c7f91471

2 changed files with 26 additions and 6 deletions

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22

kernel/bpf/verifier.c

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10

kernel/trace/bpf_trace.c

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