_REG_PSW
uc.uc_mcontext.__gregs[_REG_PSW] = sc->sc_ps;
(ucp)->uc_mcontext.__gregs[_REG_PSW] = 0x4000f;
if ((gr[_REG_PSW] & (PSW_MBS|PSW_MBZ)) != PSW_MBS) {
uc->uc_mcontext.__gregs[_REG_PSW] |= PSW_MBZ;
uc->uc_mcontext.__gregs[_REG_PSW] &= ~PSW_MBS;