bpf: interpreter support BPF_ALU | BPF_ARSH
This patch implements interpreting BPF_ALU | BPF_ARSH. Do arithmetic right shift on low 32-bit sub-register, and zero the high 32 bits. Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Jiong Wang <jiong.wang@netronome.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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