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Author	SHA1	Message	Date
Andrii Nakryiko	b82bb1ffbb	selftests/bpf: Add CO-RE relos and SEC("?...") to linked_funcs selftests Enhance linked_funcs selftest with two tricky features that might not obviously work correctly together. We add CO-RE relocations to entry BPF programs and mark those programs as non-autoloadable with SEC("?...") annotation. This makes sure that libbpf itself handles .BTF.ext CO-RE relocation data matching correctly for SEC("?...") programs, as well as ensures that BPF static linker handles this correctly (this was the case before, no changes are necessary, but it wasn't explicitly tested). Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20220426004511.2691730-6-andrii@kernel.org	2022-04-26 15:41:46 -07:00
Andrii Nakryiko	8555defe48	selftests/bpf: Add CO-RE relos into linked_funcs selftests Add CO-RE relocations into __weak subprogs for multi-file linked_funcs selftest to make sure libbpf handles such combination well. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20220408181425.2287230-4-andrii@kernel.org	2022-04-08 22:24:15 +02:00
Andrii Nakryiko	f2644fb44d	selftests/bpf: Add function linking selftest Add selftest validating various aspects of statically linking functions: - no conflicts and correct resolution for name-conflicting static funcs; - correct resolution of extern functions; - correct handling of weak functions, both resolution itself and libbpf's handling of unused weak function that "lost" (it leaves gaps in code with no ELF symbols); - correct handling of hidden visibility to turn global function into "static" for the purpose of BPF verification. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210423181348.1801389-16-andrii@kernel.org	2021-04-23 14:05:27 -07:00

Author

SHA1

Message

Date

Andrii Nakryiko

b82bb1ffbb

selftests/bpf: Add CO-RE relos and SEC("?...") to linked_funcs selftests

Enhance linked_funcs selftest with two tricky features that might not
obviously work correctly together. We add CO-RE relocations to entry BPF
programs and mark those programs as non-autoloadable with SEC("?...")
annotation. This makes sure that libbpf itself handles .BTF.ext CO-RE
relocation data matching correctly for SEC("?...") programs, as well as
ensures that BPF static linker handles this correctly (this was the case
before, no changes are necessary, but it wasn't explicitly tested).

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220426004511.2691730-6-andrii@kernel.org

2022-04-26 15:41:46 -07:00

Andrii Nakryiko

8555defe48

selftests/bpf: Add CO-RE relos into linked_funcs selftests

Add CO-RE relocations into __weak subprogs for multi-file linked_funcs
selftest to make sure libbpf handles such combination well.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220408181425.2287230-4-andrii@kernel.org

2022-04-08 22:24:15 +02:00

Andrii Nakryiko

f2644fb44d

selftests/bpf: Add function linking selftest

Add selftest validating various aspects of statically linking functions:
  - no conflicts and correct resolution for name-conflicting static funcs;
  - correct resolution of extern functions;
  - correct handling of weak functions, both resolution itself and libbpf's
    handling of unused weak function that "lost" (it leaves gaps in code with
    no ELF symbols);
  - correct handling of hidden visibility to turn global function into
    "static" for the purpose of BPF verification.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210423181348.1801389-16-andrii@kernel.org

2021-04-23 14:05:27 -07:00

3 Commits