Addressing mode requirements

All JES2 exit routines:

are entered in 31-bit addressing mode
return in 31-bit addressing mode
must have all input address parameters to the exit in 31-bit fields. (Although some addresses may be restricted to below a 16-megabyte address for example, the $PRPUT, $PBLOCK, and $SEPPDIR service routines. These should use the $GETBUF macro to obtain HASP-type buffers because of this restriction.)
must be compatible with all referenced control blocks

The addressing mode may be changed within an exit by using the $AMODE macro. It is the user's responsibility to understand the addressing mode considerations of each exit and control the mode accordingly. See the $AMODE macro description for more information.