// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Facebook

#include <linux/ptrace.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

#define VAR_NUM 2

struct hmap_elem {
        struct bpf_spin_lock lock;
        int var[VAR_NUM];
};

struct {
        __uint(type, BPF_MAP_TYPE_HASH);
        __uint(max_entries, 1);
        __type(key, __u32);
        __type(value, struct hmap_elem);
} hash_map SEC(".maps");

SEC("freplace/handle_kprobe")
int new_handle_kprobe(struct pt_regs *ctx)
{
        struct hmap_elem *val;
        int key = 0;

        val = bpf_map_lookup_elem(&hash_map, &key);
        if (!val)
                return 1;
        /* spin_lock in hash map */
        bpf_spin_lock(&val->lock);
        val->var[0] = 99;
        bpf_spin_unlock(&val->lock);

        return 0;
}

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