round_down
obj->vaddrbase = round_down(vaddr);
base_vaddr = round_down(segs[0]->p_vaddr);
data_offset = round_down(segs[nsegs]->p_offset);
data_vaddr = round_down(segs[nsegs]->p_vaddr);
data_offset = round_down(segs[i]->p_offset);
data_vaddr = round_down(segs[i]->p_vaddr);
clear_page = mapbase + (round_down(clear_vaddr)
uintptr_t relro_start = round_down((uintptr_t)obj->relro_page);
size_t relro_size = round_down(relro_end) - relro_start;
#define round_up(x) round_down((x) + _rtld_pagesz - 1)