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bpf: selftests: Test fentry tracing a struct_ops program
This patch tests attaching an fentry prog to a struct_ops prog. Signed-off-by: Martin KaFai Lau <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Acked-by: Yonghong Song <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
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// SPDX-License-Identifier: GPL-2.0 | ||
#include <linux/bpf.h> | ||
#include <bpf/bpf_helpers.h> | ||
#include <bpf/bpf_tracing.h> | ||
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int val = 0; | ||
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SEC("fentry/test_1") | ||
int BPF_PROG(fentry_test_1, __u64 *st_ops_ctx) | ||
{ | ||
__u64 state; | ||
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/* Read the traced st_ops arg1 which is a pointer */ | ||
bpf_probe_read_kernel(&state, sizeof(__u64), (void *)st_ops_ctx); | ||
/* Read state->val */ | ||
bpf_probe_read_kernel(&val, sizeof(__u32), (void *)state); | ||
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return 0; | ||
} | ||
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char _license[] SEC("license") = "GPL"; |