The BLSABDPL mapping macro is the IPCS exit routine parameter list. There are three ways in which the ABDPL address can be passed to the storage management macros:

1. Routines that require no formal parameter may accept control in primary mode with the ABDPL address loaded into general purpose register 1. Such modules must use macros from rows where the “ABDPL address” column reads “Reg 1”.
2. Routines that require formal parameters should be designed to accept control in primary mode and receive the ABDPL address as the first formal parameter. Modules that do so should use macros from rows where the “ABDPL address” column reads “Parm 1”.
3. IKJPARS validity-check routines, many of which have been written for use by IPCS, receive control in primary mode with IKJPARS forwarding an address supplied to it as a second formal parameter. IKJPARS validity-check routines written for use by modules that supply IKJPARS with the ABDPL address should use macros from rows where the “ABDPL address” column reads “Parm 2”.