I purchased a used Samsung Galaxy Core Prime for testing. It has a 
Cortex-A53/ARM-v8a (Qualcomm's SnapDragon 410) and it is powered by Android 
5.1.1.

The Cortex-A53/ARM-v8a is a 64-bit architecture. However, when I cat  
/proc/cpuinfo, it appears to be in a 32-bit mode (see below).

How do I enable 64-bit mode for testing?

--------

This device is for testing only. I test builds of OpenSSL, Crypto++ and a 
few other libraries from the command line using the NDK, push it to the 
device, and then execute self tests over adb. That's all the device is used 
for.

--------

$ adb shell cat /proc/cpuinfo
processor    : 0
model name    : ARMv7 Processor rev 0 (v7l)
BogoMIPS    : 38.40
Features    : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4
idiva idivt vfpd32
CPU implementer    : 0x41
CPU architecture: 7
CPU variant    : 0x0
CPU part    : 0xd03
CPU revision    : 0

processor    : 1
model name    : ARMv7 Processor rev 0 (v7l)
BogoMIPS    : 38.40
Features    : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4
idiva idivt vfpd32
CPU implementer    : 0x41
CPU architecture: 7
CPU variant    : 0x0
CPU part    : 0xd03
CPU revision    : 0

processor    : 2
model name    : ARMv7 Processor rev 0 (v7l)
BogoMIPS    : 38.40
Features    : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4
idiva idivt vfpd32
CPU implementer    : 0x41
CPU architecture: 7
CPU variant    : 0x0
CPU part    : 0xd03
CPU revision    : 0

processor    : 3
model name    : ARMv7 Processor rev 0 (v7l)
BogoMIPS    : 38.40
Features    : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4
idiva idivt vfpd32
CPU implementer    : 0x41
CPU architecture: 7
CPU variant    : 0x0
CPU part    : 0xd03
CPU revision    : 0

Hardware    : Qualcomm Technologies, Inc MSM8916
Revision    : 0006
Serial        : 000009f200000001
Processor    : ARMv7 Processor rev 0 (v7l)

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