2.6.10.6.1 Syntax
MRS{cond} Rd, spec_reg
where:
cond is an optional condition code, see Conditional Execution.
Rd is the destination register.
spec_reg can be any of: APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP, PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL.
Note: All the EPSR and IPSR fields are zero when read by the MRS instruction.