// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Hengqi Chen */

#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

pid_t my_pid = 0;

int test1_result = 0;
int test2_result = 0;
int test3_result = 0;
int test4_result = 0;

SEC("uprobe/./liburandom_read.so:urandlib_api_sameoffset")
int BPF_UPROBE(test1)
{
        pid_t pid = bpf_get_current_pid_tgid() >> 32;

        if (pid != my_pid)
                return 0;

        test1_result = 1;
        return 0;
}

SEC("uprobe/./liburandom_read.so:urandlib_api_sameoffset@LIBURANDOM_READ_1.0.0")
int BPF_UPROBE(test2)
{
        pid_t pid = bpf_get_current_pid_tgid() >> 32;

        if (pid != my_pid)
                return 0;

        test2_result = 1;
        return 0;
}

SEC("uretprobe/./liburandom_read.so:urandlib_api_sameoffset@@LIBURANDOM_READ_2.0.0")
int BPF_URETPROBE(test3, int ret)
{
        pid_t pid = bpf_get_current_pid_tgid() >> 32;

        if (pid != my_pid)
                return 0;

        test3_result = ret;
        return 0;
}

SEC("uprobe")
int BPF_UPROBE(test4)
{
        pid_t pid = bpf_get_current_pid_tgid() >> 32;

        if (pid != my_pid)
                return 0;

        test4_result = 1;
        return 0;
}

#if defined(__TARGET_ARCH_x86)
struct pt_regs regs;

SEC("uprobe")
int BPF_UPROBE(test_regs_change)
{
        pid_t pid = bpf_get_current_pid_tgid() >> 32;

        if (pid != my_pid)
                return 0;

        ctx->ax  = regs.ax;
        ctx->cx  = regs.cx;
        ctx->dx  = regs.dx;
        ctx->r8  = regs.r8;
        ctx->r9  = regs.r9;
        ctx->r10 = regs.r10;
        ctx->r11 = regs.r11;
        ctx->di  = regs.di;
        ctx->si  = regs.si;
        return 0;
}

unsigned long ip;

SEC("uprobe")
int BPF_UPROBE(test_regs_change_ip)
{
        pid_t pid = bpf_get_current_pid_tgid() >> 32;

        if (pid != my_pid)
                return 0;

        ctx->ip = ip;
        return 0;
}
#endif