SREG_IBREAKA
case SREG_IBREAKA + 0:
xtensa_set_sr(v, SREG_IBREAKA + 0);
case SREG_IBREAKA + 1:
xtensa_set_sr(v, SREG_IBREAKA + 1);
xtensa_wsr(info->address, SREG_IBREAKA + reg);