S0=1<<1
S1=1<<2
F=1<<26
I=1<<27
V=1<<28
C=1<<29
Z=1<<30
N=1<<31

USR=0'Normal'
FIQ=1R8_FIQ->R14_FIQ
IRQ=2R13_IRQ->R14_IRQ
SVC=3R13_SVC->R14_SVC