PI65902: METAL-C COMPILER MAY REFERENCE AN INVALID ADDRESS WHILE ACCESSING STORAGE USING ALET IN ACCESS REGISTER MODE.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• If a user composes a far pointer out of a valid ALET and a hard
  coded constant offset there is a potential that the compiler
  will generate code trying to dereference the pointer using a
  fixed offset and base register R0 to mean zero address. This
  causes the compiler to use AR0 to hold the ALET but AR0 also is
  interpreted at ALET=0.  As a result it could lead to
  referencing an invalid address in primary space instead of the
  valid non-primary address space.
  

Local fix

• Avoid using hard coded offset when constructing a far pointer.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: XLC users of Metal-C AR mode.                *
  ****************************************************************
  * PROBLEM DESCRIPTION: If a user composes a far pointer out    *
  *                      ofa valid ALET and a hard coded         *
  *                      constant offset there is a potential    *
  *                      that the compiler will generate code    *
  *                      trying todereference the pointer using  *
  *                      a fixed offset and base register R0 to  *
  *                      mean zero address. This forces the      *
  *                      compiler to use AR0 to hold the ALET    *
  *                      but AR0 also is interpreted at ALET=0.  *
  *                      This could lead to referencing an       *
  *                      invalid address in primary space        *
  *                      instead of the valid non-primary        *
  *                      address space.                          *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF.                      *
  *                                                              *
  ****************************************************************
  .
  

Problem conclusion

• Apply provided fix.
  

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

• CCNETBY
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R7A0 PSY UI41215

     UP16/11/02 P F611

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.