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author | Andrii Nakryiko <andriin@fb.com> | 2019-11-02 01:28:09 +0300 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-11-04 18:06:56 +0300 |
commit | 8b1cb1c9601f835c025af5b3cf0e98c8048ad30b (patch) | |
tree | 85f2c8256c7046b8cfdb1d52182c4ae064f6f690 /tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c | |
parent | 94f060e98495e26fd02e18c14e78c61f0d643fd6 (diff) | |
download | linux-8b1cb1c9601f835c025af5b3cf0e98c8048ad30b.tar.xz |
selftest/bpf: Add relocatable bitfield reading tests
Add a bunch of selftests verifying correctness of relocatable bitfield reading
support in libbpf. Both bpf_probe_read()-based and direct read-based bitfield
macros are tested. core_reloc.c "test_harness" is extended to support raw
tracepoint and new typed raw tracepoints as test BPF program types.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191101222810.1246166-5-andriin@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c b/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c new file mode 100644 index 000000000000..738b34b72655 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include <linux/bpf.h> +#include <stdint.h> +#include "bpf_helpers.h" +#include "bpf_core_read.h" + +char _license[] SEC("license") = "GPL"; + +static volatile struct data { + char in[256]; + char out[256]; +} data; + +struct core_reloc_bitfields { + /* unsigned bitfields */ + uint8_t ub1: 1; + uint8_t ub2: 2; + uint32_t ub7: 7; + /* signed bitfields */ + int8_t sb4: 4; + int32_t sb20: 20; + /* non-bitfields */ + uint32_t u32; + int32_t s32; +}; + +/* bitfield read results, all as plain integers */ +struct core_reloc_bitfields_output { + int64_t ub1; + int64_t ub2; + int64_t ub7; + int64_t sb4; + int64_t sb20; + int64_t u32; + int64_t s32; +}; + +struct pt_regs; + +struct trace_sys_enter { + struct pt_regs *regs; + long id; +}; + +SEC("tp_btf/sys_enter") +int test_core_bitfields_direct(void *ctx) +{ + struct core_reloc_bitfields *in = (void *)&data.in; + struct core_reloc_bitfields_output *out = (void *)&data.out; + + out->ub1 = BPF_CORE_READ_BITFIELD(in, ub1); + out->ub2 = BPF_CORE_READ_BITFIELD(in, ub2); + out->ub7 = BPF_CORE_READ_BITFIELD(in, ub7); + out->sb4 = BPF_CORE_READ_BITFIELD(in, sb4); + out->sb20 = BPF_CORE_READ_BITFIELD(in, sb20); + out->u32 = BPF_CORE_READ_BITFIELD(in, u32); + out->s32 = BPF_CORE_READ_BITFIELD(in, s32); + + return 0; +} + |