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When are A32 state and A64 state determined?

hi, expert

i study ArmV8 architecture.

  On taking an exception to a higher Exception level, the Execution state either:

    • Remains unchanged.

    • Changes from AArch32 state to AArch64 state.

  i konw that When an higher exception occurs, the execute state is changed from A32 to A64 state.

  I wonder Remains unchanged and changed(from AArch32 state to AArch64) state conditions.

  In ARMv7, Arm or Thum bit changes 16 bit/ 32 bit, in ARMv8 is there same decision bit?

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