A fix is available
APAR status
Closed as program error.
Error description
Loading and storing values from a bit field struct is causing a memory write overlay on memory past the end of the bit field. The issue occurs when loading and storing 4 bytes when only 3 bytes should be updated.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: USERS THAT HAVE A BIT FIELD OF THREE BYTES * * OCCUPYING THE LAST THREE BYTES OF A BIT * * FIELD CONTAINER. FOR EXAMPLE:TYPEDEF STRUCT * * { UNSIGNED BF1:6; UNSIGNED BF2:2; * * UNSIGNED BF3:24;} A; * **************************************************************** * PROBLEM DESCRIPTION: THE COMPILER IS EMITTING A LOAD/STRORE * * INSTRUCTION STARTING AT OFFSET 1 THUS * * ACCESSING THE BYTE FOLLOWING THE BIT * * FIELD. IN MOST CASES THIS DOES NOT * * CAUSE A PROBLEM SINCE THE BYTE * * FOLLOWING THE BIT FIELD IS UPDATED * * WITH THE SAME CONTENT IT ALREADY HAS, * * BUT WHEN THE BIT FIELD IS AT THE END * * OF THE ADDRESS SPACE OR AT THE END OF * * THE PAGE THIS PRODUCES AN 0C4 ABEND. * **************************************************************** * RECOMMENDATION: * **************************************************************** THE COMPILER IS PRODUCING BAD CODE FOR SOURCES WITH BIT FIELDS.
Problem conclusion
APPLY PROVIDED FIX.
Temporary fix
Comments
APAR Information
APAR number
PI65370
Reported component name
C/C++ FOR MVS
Reported component ID
56551210A
Reported release
790
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-07-05
Closed date
2016-07-06
Last modified date
2016-10-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Modules/Macros
CCNEP
Fix information
Fixed component name
C/C++ FOR MVS
Fixed component ID
56551210A
Applicable component levels
R790 PSY UI39212
UP16/09/02 P F609
Fix is available
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Document Information
Modified date:
22 August 2024