ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Operation
if ConditionPassed() then
EncodingSpecificOperations();
if write_spsr then
SPSRWriteByInstr(imm32, mask);
else
CPSRWriteByInstr(imm32, mask, FALSE); // Does not affect execution state bits
// other than E
Exceptions
None.
E bit
System Instructions
The CPSR.E bit is writable from any mode using an MSR instruction. Use of this to change its value is
deprecated. Use the SETEND instruction instead.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. B6-13