PH48029: INCORRECT LOADED NAB SIZE FOR 31-BIT CODE CALLING 64-BIT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In a 31-bit function calling a 64-bit function, the prolog
  appears to build an 8-byte/64-bit NAB (next available byte),
  because of the 64-bit function that will be called:
  
    ST    4,#NAB_1-@@AUTO@1+4(,13) // VALUE IS STORED IN +4 OFFSET
    MVHI  #NAB_1-@@AUTO@1(13),0    // AND THE REST OF THE NAB IS
                                         // ZEROED OUT
  
  When the NAB is used later in the code, only a 31-bit L load is
  used, which only loads the ZEROED OUT portion of the 64-bit NAB:
  
    L     15,#NAB_1
  
  This value may be used later and may result in an invalid store:
  
    LA    14,8(,15)   // LOADS '8' INTO GR14
    ...
    STY   4,-8(0,14)  // TRIES TO STORE TO '8' + '-8' , I.E. NULL
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of metal C compiling at 32bit with     *
  *                 a mixed amode call to a 64bit function       *
  *                 involving                                    *
  *                 variable length arrays and/or memory         *
  *                 allocated with                               *
  *                 alloca.                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: An abend will occur due to an           *
  *                      incorrect offset when attempting to     *
  *                      load from the NAB                       *
  ****************************************************************
  * RECOMMENDATION: install the PTF                              *
  ****************************************************************
  N/A
  

Problem conclusion

• install the PTF
  

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:

Modules/Macros

• CCNECICS CCNECWI  CCNED240 CCNEDSCT CCNEDWRT CCNEFILT CCNEHIFC
  CCNEIPA3 CCNEIPAO CCNEMDEP CCNEOPTP CCNEP    CCNEPP   CCNETBY
  CCNMSGE  CCNMSGT  CCNQIPA
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R7C0 PSY UI81828

     UP22/09/07 P F209

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.