#[no_mangle] #[naked]
pub unsafe extern "C" fn __chkstk() {
    core::arch::asm!(
    "push   %rcx",
    "push   %rax",
    "cmp    $0x1000,%rax",
    "lea    24(%rsp),%rcx",
    "jb     1f",
    "2:",
    "sub    $0x1000,%rcx",
    "test   %rcx,(%rcx)",
    "sub    $0x1000,%rax",
    "cmp    $0x1000,%rax",
    "ja     2b",
    "1:",
    "sub    %rax,%rcx",
    "test   %rcx,(%rcx)",
    "pop    %rax",
    "pop    %rcx",
    "ret",
    options(noreturn, att_syntax)
    );
}