PK67273: __gtca() high bits cleared in function call

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When the results of __gtca() are passed to a function call in
  64-bit mode withouth optimization, the top bits of the address
  are cleared.
  
  e.g.:
  $ cat tc.c
  #include <stdio.h>
  #include <stdlib.h>
  void *
  print(const void *caa)
  {
    printf("%016p\n", caa);
    return NULL;
  }
  int main()
  {
     const void *caa;
     print(__gtca());
     printf("%016p\n", __gtca());
     caa = __gtca();
     printf("%016p\n", caa);
  }
  $ xlc -Wc,lp64 -Wl,lp64 tc.c
  $ a.out
  0000000000007B18
  0000000000007B18
  0000000100007B18
  $
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Compiling at 64bit mode and noopt            *
  *                 that uses _gtca builtin.                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: The builtin _gtca would clear upper     *
  *                      half of the address of the CAA.         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  WORKAROUND:
                      Problem not presented at opt compilation.
  EXPECTED ERROR:
                      The address of the CAA that is returned from
                      _gtca has the upper half cleared to 0
  

Problem conclusion

• Removed the clearing of the address which was being
  enforced at noopt code generation.
  

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:

  PK69488

Modules/Macros

•    CCNETBY
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R740 PSY UK38212

     UP08/09/13 P F809

Fix is available

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