PM79271: ABEND0C4 IN ICEF64C FOLLOWED BY ABEND4082 FOLLOWING AN EXCI CALL FROM A DFSORT EXIT PROGRAM.

APAR status

• Closed as Permanent restriction.

Error description

• You have a program that uses the EXCI call interface.
  This program makes use of the high word of 64-bit registers.
  This program is finding that the high word of several of the
  64-bit registers is changed following an EXCI call.
     This problem causes an abend0C4 in ICEF64C followed by
  an abend4082 when the program making the EXCI call is running
  as a DFSORT exit.  At time of 0C4, ICEF64C is running in
  64-bit mode.   The 0C4 is caused by the high word of Reg7 not
  being what it was before the EXCI call.
     At CICS/TS 4.2, DFHXCTRI and DFHXCTRP alter the high
  word of several of the 64-bit registers.  Neither module
  saves the high words of registers on entry and then restores
  them on return.
  

Local fix

•    In the case of the problem happening during a DFSORT job,
  use DFSORT parameter MOSIZE=0.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An assembly application program uses the EXCI call interface to
  link to a CICS program. The program makes use of the high word
  of 64-bit registers. This program is finding that the high word
  of several of the 64-bit registers is changed following an EXCI
  call.
  
  This is a known assembly language programming restriction as
  documented in the section 'Programming in assembly language' in
  the CICS Transaction Server for z/OS Version 4 Release 2
  Application Programming Guide, SC34-7158-02, which states
  the following :
  
  The following restriction applies to an assembly language
  application program that uses 64-bit registers to use 64-bit
  addressing mode or 64-bit binary operations:
  CICS does not always preserve the high-order words of 64-bit
  registers. You must save them before you invoke a CICS service,
  and restore them before using the 64-bit registers again.
  

Problem conclusion

• An assembly language CICS application program must save and
  restore the contents of 64-bit registers around a call to
  invoke a CICS service.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels