// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
#include "bpf_misc.h"

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

__u64 uprobe_multi_func_1_addr = 0;
__u64 uprobe_multi_func_2_addr = 0;
__u64 uprobe_multi_func_3_addr = 0;

__u64 uprobe_session_result[3] = {};
__u64 uprobe_multi_sleep_result = 0;

void *user_ptr = 0;
int pid = 0;

static int uprobe_multi_check(void *ctx, bool is_return)
{
        const __u64 funcs[] = {
                uprobe_multi_func_1_addr,
                uprobe_multi_func_2_addr,
                uprobe_multi_func_3_addr,
        };
        unsigned int i;
        __u64 addr;

        if (bpf_get_current_pid_tgid() >> 32 != pid)
                return 1;

        addr = bpf_get_func_ip(ctx);

        for (i = 0; i < ARRAY_SIZE(funcs); i++) {
                if (funcs[i] == addr) {
                        uprobe_session_result[i]++;
                        break;
                }
        }

        /* only uprobe_multi_func_2 executes return probe */
        if ((addr == uprobe_multi_func_1_addr) ||
            (addr == uprobe_multi_func_3_addr))
                return 1;

        return 0;
}

SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*")
int uprobe(struct pt_regs *ctx)
{
        return uprobe_multi_check(ctx, bpf_session_is_return(ctx));
}

static __always_inline bool verify_sleepable_user_copy(void)
{
        char data[9];

        bpf_copy_from_user(data, sizeof(data), user_ptr);
        return bpf_strncmp(data, sizeof(data), "test_data") == 0;
}

SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*")
int uprobe_sleepable(struct pt_regs *ctx)
{
        if (verify_sleepable_user_copy())
                uprobe_multi_sleep_result++;
        return uprobe_multi_check(ctx, bpf_session_is_return(ctx));
}