注意要恢复之前的 unicorn/qemu/target/i386/excp_helper.c
/* align to page_size */
pte &= PG_ADDRESS_MASK & ~(page_size - 1);
page_offset = addr & (page_size - 1);
/* HACK allow full 64 bit mapping in u64 without paging */
if (env->cr[0] & CR0_PG_MASK) {
paddr = get_hphys(cs, pte + page_offset, is_write1, &prot);
} else {
paddr = addr;
}