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.
The processor 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 trap.
In AArch64 state, these registers are named TEECR32_EL1 and TEEHBR32_EL1 respectively, and access to these registers results in an Undefined Instruction trap.