This is probably a part of code which will be changed at link time.
The 12 in the encoding says that the immediate will be right rotated by 12 bits. Obviously that currently does not make sense for a #0. Also the whole opcode is currently nothing more than a fancy
mov ip, pc
Have a look at the code during runtime, probably the #0 changed into something which makes more sense.
The numbers never lie.
e28fc600
Nibbles
e
always28
add immediate with no condition codes set.f
Rb is thepc
orR15
.c
Rd is theip
orR12
.600
are the shifter ops or zero rotated by 6*2 .
As the instruction is rather bizzare the disassembled output maybe abnormal; normally just the constant is displayed #0xef00 as nobody cares how it is encoded. Also, as this is a shared library, the instruction maybe fixed up via a relocation at run time.