User mode is the usual ARM program execution state, and is used for executing most application programs.

Fast interrupt (FIQ) mode supports a data transfer or channel process.

Interrupt (IRQ) mode is used for general-purpose interrupt handling.

Supervisor mode is a protected mode for the operating system.

Abort mode is entered after a data or instruction prefetch abort.

System mode is a privileged user mode for the operating system.

Undefined mode is entered when an undefined instruction is executed.