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    /// Variable argument version of `syscall`
    #[macro_export]
    macro_rules! syscall {
        ($nr:ident) => {
            $crate::syscall1($crate::nr::$nr, 0)
        };
        ($nr:ident, $a1:expr) => {
            $crate::syscall($crate::nr::$nr, &[$a1 as usize])
        };
        ($nr:ident, $a1:expr, $a2:expr) => {
            $crate::syscall($crate::nr::$nr, &[$a1 as usize, $a2 as usize])
        };
        ($nr:ident, $a1:expr, $a2:expr, $a3:expr) => {
            $crate::syscall($crate::nr::$nr, &[$a1 as usize, $a2 as usize,
                                               $a3 as usize])
        };
        ($nr:ident, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
            $crate::syscall($crate::nr::$nr, &[$a1 as usize, $a2 as usize,
                                               $a3 as usize, $a4 as usize])
        };
    }

    /// Macro version of `syscall1`
    #[macro_export]
    macro_rules! syscall1 {
        ($nr:ident, $a1:expr) => {
            $crate::syscall1($crate::nr::$nr, $a1 as usize)
        };
    }

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