bpf: Allow struct argument in trampoline based programs

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Allow struct argument in trampoline based programs where
the struct size should be <= 16 bytes. In such cases, the argument
will be put into up to 2 registers for bpf, x86_64 and arm64
architectures.

To support arch-specific trampoline manipulation,
add arg_flags for additional struct information about arguments
in btf_func_model. Such information will be used in arch specific
function arch_prepare_bpf_trampoline() to prepare argument access
properly in trampoline.

Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220831152646.2078089-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Yonghong Song 2022-08-31 08:26:46 -07:00 • committed by Alexei Starovoitov

parent 1e660f7ebe

commit 720e6a4351

2 changed files with 43 additions and 6 deletions

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4

include/linux/bpf.h

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45

kernel/bpf/btf.c

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