_REG_SR
(ucp)->uc_mcontext.__gregs[_REG_SR] = 0;
gr[_REG_SR] = tf->tf_regs[_R_SR];
gr[_REG_SR] = tf->tf_ssr;
if (((tf->tf_ssr ^ gr[_REG_SR]) & PSL_USERSTATIC) != 0)
tf->tf_ssr = gr[_REG_SR];
uc->uc_mcontext.__gregs[_REG_SR] |= PSL_MD;