PT_CTR
CHECK_REG(PT_CTR, ctr);
unsafe_get_user(regs->ctr, &sc->gp_regs[PT_CTR], efault_out);
err |= __get_user(regs->ctr, &tm_sc->gp_regs[PT_CTR]);
&sc->gp_regs[PT_CTR]);
ucp->uc_mcontext.gp_regs[PT_CTR] = random();
ucp->uc_link->uc_mcontext.gp_regs[PT_CTR] = random();