00000000 # test 5.3.1.6: Readback value from zeroing out MIE. # note that none of the attempted interrupts should fire since MIE is zeroed. 
0000000b # mcause for ecall from terminating tests in M mode
00000000 # mtval of ecall (*** defined to be zero for now)
00001880 # masked out mstatus.MPP = 11, mstatus.MPIE = 1, and mstatus.MIE = 0
