location of peer manager storage and gcc linker file

I use Peer Manager for storing bonding infomation with nRF52832 (SDK14.2) using gcc.

I understand Peer Manager uses FDS, and FDS uses flash memory from 0x7D000 to 0x80000.

Looking at nordic example, there is no declaration of that FDS are in link file(xxx.ld). 

How does gcc know FDS area?

I am afraid if I use flash memory of Application program over 0x7D000, it must crash.