unwind__prepare_access
err = unwind__prepare_access(dest, new, NULL);
err = unwind__prepare_access(dest, new, NULL);
ret = unwind__prepare_access(thread__maps(thread), map, NULL);
args->err = unwind__prepare_access(args->maps, map, &initialized);
int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized);