tree eaeff2121d53c4cafcb35c2227e9ee34ae6f9301
parent e274da1a50f6f3c8216e5bb22e1b0964ab993f13
author David Daney <david.daney@cavium.com> 1497397776 -0700
committer David S. Miller <davem@davemloft.net> 1497467002 -0400

test_bpf: Add test to make conditional jump cross a large number of insns.

On MIPS, conditional branches can only span 32k instructions.  To
exceed this limit in the JIT with the BPF maximum of 4k insns, we need
to choose eBPF insns that expand to more than 8 machine instructions.
Use BPF_LD_ABS as it is quite complex.  This forces the JIT to invert
the sense of the branch to branch around a long jump to the end.

This (somewhat) verifies that the branch inversion logic and target
address calculation of the long jumps are done correctly.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>