Function syscalls::syscall4

pub unsafe fn syscall4(
    nr: Sysno,
    a1: usize,
    a2: usize,
    a3: usize,
    a4: usize
) -> Result<usize, Errno>

Issues a system call with 4 arguments.

Safety

Running a system call is inherently unsafe. It is the caller’s responsibility to ensure safety.