gtpi1m22System Installation Support Reference

Stack Overflow Processing (ISO-C)

User exit routine UCCCSOX is activated at the end of stack overflow processing if the exit point named CSOX is active. User exit CSOX is called from an ISO-C environment. Exit point CSOX is in CSECT CCISOC (CIS2).

General Conditions at Entry

The registers at entry to UCCCSOX are:

R8
Points to the dynamic load module (DLM) header.

R9
Address of the ECB.

R13-R15
See User Exit Routines - Common Entry Conditions.

System Conditions at Entry

System state
Problem (see Programming Considerations at Entry, item 1)

System mask
Unmasked (see Programming Considerations at Entry, item 1)

Protect key
Working storage

Address state
EVM.

Programming Considerations at Entry

  1. Usually, the system state, system mask, and protection key are as stated. However, there can be exceptions if system programs issued MONTC to get to supervisor state, changed the system mask, or changed the protection key.
  2. See User Exit Routines - Common Programming Considerations for other considerations.

Programming Considerations on Return

See User Exit Routines - Common Return Conditions.

General Conditions on Return

See User Exit Routines - Common Return Conditions.