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