1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/bpf.h>
3 #include <bpf/bpf_helpers.h>
4 #include <bpf/bpf_tracing.h>
5
6 int val = 0;
7
8 SEC("fentry/test_1")
9 int BPF_PROG(fentry_test_1, __u64 *st_ops_ctx)
10 {
11 __u64 state;
12
13 /* Read the traced st_ops arg1 which is a pointer */
14 bpf_probe_read_kernel(&state, sizeof(__u64), (void *)st_ops_ctx);
15 /* Read state->val */
16 bpf_probe_read_kernel(&val, sizeof(__u32), (void *)state);
17
18 return 0;
19 }
20
21 char _license[] SEC("license") = "GPL";
22
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