bpf tools: Check endianness and make libbpf fail early
authorWang Nan <wangnan0@huawei.com>
Wed, 1 Jul 2015 02:13:55 +0000 (02:13 +0000)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Fri, 7 Aug 2015 13:16:56 +0000 (10:16 -0300)
commitcc4228d57c4c35ae0a29efa1e7687a817dc038d9
tree0cef04e1c38b6d910a280b3f40f1b67b61fabdb1
parent6c956392b0486c170e382476ab9dd97a696fd169
bpf tools: Check endianness and make libbpf fail early

Check endianness according to EHDR. Code is taken from
tools/perf/util/symbol-elf.c.

Libbpf doesn't magically convert missmatched endianness. Even if we swap
eBPF instructions to correct byte order, we are unable to deal with
endianness in code logical generated by LLVM.

Therefore, libbpf should simply reject missmatched ELF object, and let
LLVM to create good code.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1435716878-189507-8-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/lib/bpf/libbpf.c