3.3 ThumbEE instruction set
The Thumb Execution Environment (ThumbEE) extension is a variant of the Thumb instruction set that is designed as a target for dynamically generated code.
does not implement the T32EE (ThumbEE) instruction set.
In AArch32 state, access to the ThumbEE Configuration Register, TEECR, and
ThumbEE Handler Base Register, TEEHBR, results in an Undefined Instruction
In AArch64 state, these registers are named TEECR32_EL1 and
TEEHBR32_EL1 respectively, and access to these registers results
in an Undefined Instruction trap.