Function mock_syscall_entrypoint 

pub unsafe extern "C" fn mock_syscall_entrypoint(
    syscall: i32,
    arg1: u64,
    arg2: u64,
    arg3: u64,
    arg4: u64,
    arg5: u64,
    arg6: u64,
    arg7: u64,
) -> ForeignHostFnResult