#[inline(always)]
pub fn syscall0(nr: usize) -> usize {
    let ret: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            lateout("a0") ret,
        );
    }
    ret
}

#[inline(always)]
pub fn syscall1(nr: usize, a0: usize) -> usize {
    let ret: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            inlateout("a0") a0 => ret,
        );
    }
    ret
}

#[inline(always)]
pub fn syscall2(nr: usize, a0: usize, a1: usize) -> usize {
    let ret: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            inlateout("a0") a0 => ret,
            in("a1") a1,
        );
    }
    ret
}

#[inline(always)]
pub fn syscall3(nr: usize, a0: usize, a1: usize, a2: usize) -> usize {
    let ret: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            inlateout("a0") a0 => ret,
            in("a1") a1,
            in("a2") a2,
        );
    }
    ret
}

#[inline(always)]
pub fn syscall4(nr: usize, a0: usize, a1: usize, a2: usize, a3: usize) -> usize {
    let ret: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            inlateout("a0") a0 => ret,
            in("a1") a1,
            in("a2") a2,
            in("a3") a3,
        );
    }
    ret
}

#[inline(always)]
pub fn syscall5(nr: usize, a0: usize, a1: usize, a2: usize, a3: usize, a4: usize) -> usize {
    let ret: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            inlateout("a0") a0 => ret,
            in("a1") a1,
            in("a2") a2,
            in("a3") a3,
            in("a4") a4,
        );
    }
    ret
}

#[inline(always)]
pub fn syscall_receive(nr: usize, a0: usize) -> (usize, usize, usize, usize) {
    let r0: usize;
    let r1: usize;
    let r2: usize;
    let r3: usize;
    unsafe {
        core::arch::asm!(
            "ecall",
            in("a7") nr,
            inlateout("a0") a0 => r0,
            lateout("a1") r1,
            lateout("a2") r2,
            lateout("a3") r3,
        );
    }
    (r0, r1, r2, r3)
}