vm_map_entry_pred
*prev_entry = vm_map_entry_pred(entry);
first_entry = vm_map_entry_pred(first_entry);
for (prev_entry = vm_map_entry_pred(first_entry), entry = first_entry;
prev_entry = vm_map_entry_pred(first_entry);
prev_entry = vm_map_entry_pred(first_entry);