_REG_MSR
(ucp)->uc_mcontext.__gregs[_REG_MSR] = 0xd032;
mcp->__gregs[_REG_MSR] |= PSL_SPV;
mcp->__gregs[_REG_MSR] |= PSL_VEC;
gr[_REG_MSR] = tf->tf_srr1 & PSL_USERSRR1;
gr[_REG_MSR] |= pcb->pcb_flags & (PCB_FE0|PCB_FE1);
pcb->pcb_flags |= gr[_REG_MSR] & (PCB_FE0|PCB_FE1);
tf->tf_srr1 = (gr[_REG_MSR] & PSL_USERMOD) | PSL_USERSET;