_REG_PSL
uc.uc_mcontext.__gregs[_REG_PSL] = jb->jb_sc.sc_ps;
(ucp)->uc_mcontext.__gregs[_REG_PSL] = 0x03c00000;
gr[_REG_PSL] = tf->tf_psl;
if ((gr[_REG_PSL] & (PSL_IPL | PSL_IS)) ||
((gr[_REG_PSL] & (PSL_U | PSL_PREVU)) != (PSL_U | PSL_PREVU)) ||
(gr[_REG_PSL] & PSL_CM))
tf->tf_psl = gr[_REG_PSL];
uc->uc_mcontext.__gregs[_REG_PSL] &= ~(PSL_U | PSL_PREVU);
uc->uc_mcontext.__gregs[_REG_PSL] |= PSL_IPL | PSL_IS;
uc->uc_mcontext.__gregs[_REG_PSL] |= PSL_CM;