1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020 Facebook
3
4#include <linux/ptrace.h>
5#include <linux/bpf.h>
6#include <bpf/bpf_helpers.h>
7#include <bpf/bpf_tracing.h>
8
9#define VAR_NUM 2
10
11struct hmap_elem {
12	struct bpf_spin_lock lock;
13	int var[VAR_NUM];
14};
15
16struct {
17	__uint(type, BPF_MAP_TYPE_HASH);
18	__uint(max_entries, 1);
19	__type(key, __u32);
20	__type(value, struct hmap_elem);
21} hash_map SEC(".maps");
22
23SEC("freplace/handle_kprobe")
24int new_handle_kprobe(struct pt_regs *ctx)
25{
26	struct hmap_elem *val;
27	int key = 0;
28
29	val = bpf_map_lookup_elem(&hash_map, &key);
30	if (!val)
31		return 1;
32	/* spin_lock in hash map */
33	bpf_spin_lock(&val->lock);
34	val->var[0] = 99;
35	bpf_spin_unlock(&val->lock);
36
37	return 0;
38}
39
40char _license[] SEC("license") = "GPL";
41