0a210af6d0
This patch tests attaching an fentry prog to a struct_ops prog. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20220330011502.2985292-1-kafai@fb.com
22 lines
476 B
C
22 lines
476 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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int val = 0;
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SEC("fentry/test_1")
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int BPF_PROG(fentry_test_1, __u64 *st_ops_ctx)
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{
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__u64 state;
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/* Read the traced st_ops arg1 which is a pointer */
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bpf_probe_read_kernel(&state, sizeof(__u64), (void *)st_ops_ctx);
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/* Read state->val */
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bpf_probe_read_kernel(&val, sizeof(__u32), (void *)state);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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