Cortex-A53 cpuinfo'd as ARMv7?
Some more testing reveals the following. I've done this procedure hundreds of times, so I know the results are an ominous sign.

I'm guessing it is a Cortex-A53/ARM-v8a processor, but its configured in 32-bit mode.



$ aarch64-linux-android-readelf -h ./cryptest.exe | grep -i 'class\|machine'
  Class:                             ELF64
  Machine:                           AArch64
$ aarch64-linux-android-readelf -h ./libcryptopp.so | grep -i 'class\|machine'
  Class:                             ELF64
  Machine:                           AArch64

[Push test program to /data/local/tmp, open a remote shell]

shell@cprimeltemtr:/ $ cd /data/local/tmp
shell@cprimeltemtr:/data/local/tmp $ LD_LIBRARY_PATH=./; ./cryptest.exe v
/system/bin/sh: ./cryptest.exe: not executable: 64-bit ELF file