uvm_io
error = uvm_io(&vmspace->vm_map, &auio, 0);
error = uvm_io(&vm->vm_map, &uio, 0);
error = uvm_io(&vm->vm_map, &uio, 0);
error = uvm_io(&vm->vm_map, uio, pax_mprotect_prot(l));
int uvm_io(struct vm_map *, struct uio *, int);