I have an unwind failure where the eh_frame for a trap handler states that the caller's return address is in eh_frame register 33, which lldb treats as cpsr. https://github.com/ARM-software/abi-aa/blob/main/aadwarf64/aadwarf64.rst#dwarf-register-names Register 33 is ELR_mode, which isn't defined as a register in any of the AArch64 register definition files in lldb today, so I'm not adding it to the header files. rdar://170602999