64-bit E15 parameter list

In 64-bit general register 1, DFSORT places the address of a parameter list that contains the record address and the user address constant. The list is two doublewords long and begins on a doubleword boundary. The format of the parameter list is:

Table 1. 64-bit E15 User Exit Parameter List
64-bit E15 User Exit Parameter ListLocation	Value	Contents
Bytes 1 through 8	X'00000000'	Address of the new record
Bytes 9 through 16	X'00000000'	User exit address constant

DFSORT provides a 144-byte Format 4 save area pointed to by 64-bit register 13 in which the exit can save the 64-bit registers.

The E15 should expect and use 64-bit addresses.

Before returning control to DFSORT, you must:

Place the address of the record in 64-bit register 1. This must be a 64-bit address, a clean 31-bit address or a clean 24-bit address.
Put the return code in 64-bit register 15.

The DFSORT target library, SICEUSER, contains a mapping macro called ICEPL64, which provides a separate Assembler DSECT for the E15 64-bit parameter list.