rbus_new_body
rb = rbus_new_body(parent->rb_bt, parent, ex, start, start + size,
rb = rbus_new_body(bt, NULL, ex, start, start + size, offset,
return rbus_new_body(bt, NULL, ex, start, start + size, offset,
static rbus_tag_t rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent,