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/// syscall macro
/// accept a syscall nr and variadic arguments (0 to 6).
/// returns Ok on success, or Err(errno) on failure
#[macro_export]
macro_rules! syscall {
    ($nr:ident) => {
        $crate::helper::syscall0($crate::$nr)
    };

    ($nr:ident, $a1:expr) => {
        $crate::helper::syscall1($crate::$nr, $a1 as u64)
    };

    ($nr:ident, $a1:expr, $a2:expr) => {
        $crate::helper::syscall2($crate::$nr, $a1 as u64, $a2 as u64)
    };

    ($nr:ident, $a1:expr, $a2:expr, $a3:expr) => {
        $crate::helper::syscall3(
            $crate::$nr,
            $a1 as u64,
            $a2 as u64,
            $a3 as u64,
        )
    };

    ($nr:ident, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
        $crate::helper::syscall4(
            $crate::$nr,
            $a1 as u64,
            $a2 as u64,
            $a3 as u64,
            $a4 as u64,
        )
    };

    ($nr:ident, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
        $crate::helper::syscall5(
            $crate::$nr,
            $a1 as u64,
            $a2 as u64,
            $a3 as u64,
            $a4 as u64,
            $a5 as u64,
        )
    };

    ($nr:ident, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
        $crate::helper::syscall6(
            $crate::$nr,
            $a1 as u64,
            $a2 as u64,
            $a3 as u64,
            $a4 as u64,
            $a5 as u64,
            $a6 as u64,
        )
    };
}