Alexei Starovoitov e4975487f5 [bpf] error when unknown bpf helper is called ...

Emit error when BPF backend sees a call to a global function or to an external symbol.
The kernel verifier only allows calls to predefined helpers from bpf.h
which are defined in 'enum bpf_func_id'. Such calls in assembler must
look like 'call [1-9]+' where number matches bpf_func_id.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 292204

2017-01-17 07:26:17 +00:00

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