User Exits › Exit Routine Programming Considerations › GCMDELXT › Entry Environment

Entry Environment

Supervisor state, problem program key, AMODE 31.Use this environment at entry and restore it upon return.

Register Usage at Entry

Common Parameter List

R1

Contains the address of the parameter list, in the following format:

+0

Contains the address of the parameter list for the GCMDELXT routine. It is not used for initialization calls.

+4

Contains the communication word for the GCMDELXT routine. During its initialization call, the routine may set the word contents. The contents are passed unchanged for all subsequent calls.

+8

Contains the fullword of flags used to pass status information to the routine. The first byte X'80' bit is set on for the initialization call.

+C

Contains the global communication word. The value of this word can be set by the MIMINIXT exit.

R13

Contains the address of the standard save area.

R14

Contains the CA MIM return address.

R15

Contains the GCMDELXT entry point address.

Note: All other registers are undefined.

GCMDELXT Parameter List (mapped by the GCMDELXP macro)

+0

Contains the address of the information area.

+4

Contains the address of the four-byte user data area for the message.

Note: For more information, see Examining Message Data through the GCMDELXT Routine.

Return Code, Register 15:

0

Indicates that CA MIC should process this message as usual.

4

Indicates that CA MIC should not delete this message now. However, CA MIC should consider the message for deletion again the next time this routine encounters the message.

8

Indicates that CA MIC should delete this message immediately.

12

Indicates that CA MIC should retain this message.

Note: Upon return, you must restore all registers except 0, 1, and 15.