tools/testing/selftests/bpf/progs/dummy_st_ops.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

struct bpf_dummy_ops_state {
	int val;
} __attribute__((preserve_access_index));

struct bpf_dummy_ops {
	int (*test_1)(struct bpf_dummy_ops_state *state);
	int (*test_2)(struct bpf_dummy_ops_state *state, int a1, unsigned short a2,
		      char a3, unsigned long a4);
};

char _license[] SEC("license") = "GPL";

SEC("struct_ops/test_1")
int BPF_PROG(test_1, struct bpf_dummy_ops_state *state)
{
	int ret;

	if (!state)
		return 0xf2f3f4f5;

	ret = state->val;
	state->val = 0x5a;
	return ret;
}

__u64 test_2_args[5];

SEC("struct_ops/test_2")
int BPF_PROG(test_2, struct bpf_dummy_ops_state *state, int a1, unsigned short a2,
	     char a3, unsigned long a4)
{
	test_2_args[0] = (unsigned long)state;
	test_2_args[1] = a1;
	test_2_args[2] = a2;
	test_2_args[3] = a3;
	test_2_args[4] = a4;
	return 0;
}

SEC(".struct_ops")
struct bpf_dummy_ops dummy_1 = {
	.test_1 = (void *)test_1,
	.test_2 = (void *)test_2,
};