ARM processor modes (ARMv7)

ARM v7-A and ARM v7-R

Reference:
ARM ® Architecture Reference Manual(ARM ® v7-A and ARM ® v7-R edition)

Chapter B1 The System Level Programmers’ Model
B1.3 ARM processor modes and core registers
B1.3.1 ARM processor modes

• The ARM architecture defines eight modes

Processor mode              | Mode encoding | Privilege    | 

User             usr          10000           Unprivileged
FIQ              fiq          10001           Privileged
IRQ              irq          10010           Privileged
Supervisor       svc          10011           Privileged
Monitor          mon          10110           Privileged
Abort            abt          10111           Privileged
Undefined        und          11011           Privileged
System           sys          11111           Privileged