UContext* arg = this;
memcpy(ctx_addr, &arg, sizeof this);
makecontext(&this->uc_, (void (*)())smx_ctx_wrapper, 2, ctx_addr[0], ctx_addr[1]);
UContext* arg = this;
memcpy(ctx_addr, &arg, sizeof this);
makecontext(&this->uc_, (void (*)())smx_ctx_wrapper, 2, ctx_addr[0], ctx_addr[1]);