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