use ::std::{*,
    ops::Not,
};
use ::libc::{
    mmap,
    MAP_ANONYMOUS, MAP_PRIVATE,
    PROT_READ, PROT_WRITE, PROT_EXEC,
};

#[cfg(target_os = "linux")]
fn hello_world () -> !
{
    static HELLO_WORLD: [u8; 38] =
        *b"\x6a\x01\x5f\x89\xf8\x6a\x0d\x5a\xeb\x0a\x5e\x0f\x05\x6a\x3c\x58\xff\xcf\x0f\x05\xe8\xf1\xff\xff\xff\x48\x65\x6c\x6c\x6f\x20\x77\x6f\x72\x6c\x64\x21\x0a"
    ;
    unsafe {
        let addr = mmap(
            ptr::null_mut(),
            0x1000,
            PROT_READ | PROT_WRITE | PROT_EXEC,
            MAP_ANONYMOUS | MAP_PRIVATE,
            -1,
            0,
        ) as *mut u8;
        assert!(addr.is_null().not());
        ptr::copy_nonoverlapping(
            &HELLO_WORLD as *const u8,
            addr,
            HELLO_WORLD.len(),
        );
        mem::transmute::<_, fn() -> !>(addr)()
    }
}

fn main ()
{
    hello_world();
}