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Processor core registers
The following registers can only be accessed in PRIVILEGED mode:
- BASEPRI
- CONTROL
- FAULTMASK
- MSP
- PRIMASK
The rest of registers (see list below) can be accessed in either, PRIVILEGED or UNPRIVILEGED, mode.
- APSR
- LR
- PC
- PSP
The following registers are NOT available on ARMv6-M devices
(thumbv6m-none-eabi):
- BASEPRI
- FAULTMASK
References
- Cortex-M* Devices Generic User Guide - Section 2.1.3 Core registers