diff options
author | Andrii Nakryiko <andriin@fb.com> | 2019-08-07 14:39:54 -0700 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2019-08-07 14:43:49 -0700 |
commit | 002d3afce65518dc5dfc398a37c2be2a6bf559c4 (patch) | |
tree | 45f989fae4a4f266e5b8913ead75b31e7c1a791e /tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c | |
parent | selftests/bpf: add CO-RE relocs testing setup (diff) | |
download | linux-002d3afce65518dc5dfc398a37c2be2a6bf559c4.tar.xz linux-002d3afce65518dc5dfc398a37c2be2a6bf559c4.zip |
selftests/bpf: add CO-RE relocs struct flavors tests
Add tests verifying that BPF program can use various struct/union
"flavors" to extract data from the same target struct/union.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c b/tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c new file mode 100644 index 000000000000..9fda73e87972 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_flavors.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include <linux/bpf.h> +#include <stdint.h> +#include "bpf_helpers.h" + +char _license[] SEC("license") = "GPL"; + +static volatile struct data { + char in[256]; + char out[256]; +} data; + +struct core_reloc_flavors { + int a; + int b; + int c; +}; + +/* local flavor with reversed layout */ +struct core_reloc_flavors___reversed { + int c; + int b; + int a; +}; + +/* local flavor with nested/overlapping layout */ +struct core_reloc_flavors___weird { + struct { + int b; + }; + /* a and c overlap in local flavor, but this should still work + * correctly with target original flavor + */ + union { + int a; + int c; + }; +}; + +SEC("raw_tracepoint/sys_enter") +int test_core_flavors(void *ctx) +{ + struct core_reloc_flavors *in_orig = (void *)&data.in; + struct core_reloc_flavors___reversed *in_rev = (void *)&data.in; + struct core_reloc_flavors___weird *in_weird = (void *)&data.in; + struct core_reloc_flavors *out = (void *)&data.out; + + /* read a using weird layout */ + if (BPF_CORE_READ(&out->a, &in_weird->a)) + return 1; + /* read b using reversed layout */ + if (BPF_CORE_READ(&out->b, &in_rev->b)) + return 1; + /* read c using original layout */ + if (BPF_CORE_READ(&out->c, &in_orig->c)) + return 1; + + return 0; +} + |