- User mode: used to execute normal programs
- Fast interrupt mode: fast interrupt request: used for high-speed data transmission
- External interrupt mode: interrupt request: used for normal interrupt processing
- Management mode: supervisor: protection mode used by the operating system
- Data access termination mode: abort: This mode is entered when data or instruction prefetching is terminated. It can be used for virtual storage and storage protection.
- System mode: system: runs privileged operating system tasks
- Undefined instruction interrupt mode: undefined: This mode is entered when an undefined instruction is executed. It can be used to support hardware
The working mode of arm can be changed by software, external interrupt or exception processing. The modes other than usr are called privileged modes, and the modes other than usr and system are called exception modes, which are used to handle interrupts and exceptions, or access protected system resources.
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