PH27049: __PTR64 POINTER TREATED AS 31-BIT POINTER WHEN PASSED AS FUNCTION PARAMETER WITH O2

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A function expects a 64-bit pointer in ILP32 mode, yet when
  optimization is used, the code generated to call the function
  treats the pointer as 31-bit.  Example:
  
  
  static int my_test_func(
               SOME_TYPE *__ptr64 val, SOME_OTHER_TYPE on)
  
  
  Starting with the Nov 2019 V2R4 PTF (UI65848), the code
  generated with -O2 looks like the following:
  
  
  *  my_test_func(val,on);
    ST    7,152(,13)         <=== STORES 31-bit POINTER
    MVHI  156(13),1
    LA    1,152(,13)
    MVC   8(4,13),#NAB_8+4
    BRASL 14,@391ccsm_rcvy_set_svcdump
  
  
  Previous V2R4 releases generated correct code and parameter
  list:
  
  
  *  my_tesT_func(val,on);
    ST    7,156(,13)      <=== STORE HALF OF THE 64-BIT POINTER
    MVHI  160(13),1
    SRAG  2,7,32
    STG   2,42528(0,13)
    LA    1,152(,13)
    ST    2,152(,13) <= STORE THE OTHER HALF OF THE 64-BIT POINTER
    MVC   8(4,13),#NAB_8+4
    BRASL 14,@391ccsm_rcvy_set_svcdump
  

Local fix

• Do not use optimization.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of ILP32, METAL, and OPT compiler      *
  *                 option                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: If a __ptr64 is passed to a non         *
  *                      attribute amode64 function, the high    *
  *                      half of the pointer may not be passed   *
  *                      correctly                               *
  ****************************************************************
  * RECOMMENDATION: Install PTF or use workaround                *
  ****************************************************************
  N/A
  

Problem conclusion

• Install PTF or use workaround
  

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:

  PH33321

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 UI73821

     UP21/03/26 P F103

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.