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z/OS Cryptographic Services ICSF System Programmer's Guide

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z/OS Cryptographic Services ICSF System Programmer's Guide
SA22-7520-17

ICSF supplies the address of the conversion program exit parameter block (CVXP) in register 2 each time it calls the PCF conversion program exit. The exit does not receive a parameter list. Entry and return specifications gives a complete list of the registers on entry to the conversion program exit.

Table 19 describes the contents of the exit control block.

Table 19. CVXP Control Block Format
Offset (Dec)	Number of Bytes	Description
0	4	Name. The name of the control block. The field contains the character string `CVXP`.
4	2	Version. The version of the control block. The field contains the character string `01`.
6	2	Length. The length of the control block. The value is 28 in decimal.
8	4	Return Code. The value the exit returns. Valid decimal values for this field are: Return Code Description 0 Normal. 4 Do not process the entry. 8 End conversion program.
12	4	Address of the ICSF CKDS installation data area.
16	4	The value in decimal of the length of the ICSF CKDS installation data area.
20	1	Action. Bit 0 is set on if the action was to change an entry on the ICSF CKDS. Bit 0 is set off if the action was to add an entry to the ICSF CKDS. The rest of the bits in this byte are reserved.
21	1	Call Point. Indicates the invocation point of the exit. The exit cannot change this field and the conversion program does not use this field on return from the exit. You can determine the invocation point by the bit that is set on. Bit Meaning When Set On 0 Conversion preprocessing invocation. 1 Conversion postprocessing invocation. 2 Record processing invocation. 3-7 Reserved.
22	6	Reserved.

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