The mainline exits have these register contents on entry:

Register

Contents

0

Address of the exit parameter block (EXPB)

1

Address of a parameter list

2-12

Not applicable

13

Address of register save area

14

Return address

15

Entry point address

The service exits have these register contents on entry:

Register

Contents

0

Address of the exit parameter block (EXPB)

1

Address of a parameter list

2-13

Not applicable

14

Return address

15

Entry point address

The CKDS entry retrieval installation exit has these register contents on entry:

Register

Contents

0

Not applicable

1

Address of a parameter list

2-12

Not applicable

13

Address of register save area

14

Return address

15

Entry point address

The conversion program, single-record, read-write, and KGUP exits have these register contents on entry:

Register

Contents

0

Not applicable

1

Address of a control block (CVXP, RWXP, or KGXP, depending on the exit)

2-12

Not applicable

13

Address of register save area

14

Return address

15

Entry point address

The particular control blocks that are passed through register 0 or register 1 are described with each exit.