You can switch the operating state of the ARM1136JF-S processor
between:
ARM state and
Thumb state using the BX and BLX instructions, and loads to the PC.
Switching state is described in the ARM Architecture
Reference Manual.
ARM state and Java state using the BXJ instruction.
All exceptions are entered, handled, and exited in ARM state.
If an exception occurs in Thumb state or Java state, the processor
reverts to ARM state. Exception return instructions restore the
SPSR to the CPSR, which can also cause a transition back to Thumb
state or Java state.
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