z/OS MVS Programming: Extended Addressability Guide
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Contents of the linkage stack entry

z/OS MVS Programming: Extended Addressability Guide
SA23-1394-00

A linkage stack entry includes the following information:
  • Contents of GPRs 0 - 15
  • Contents of ARs 0 - 15
  • Primary and secondary address space numbers (PASN and SASN)
  • EAX
  • Entire current PSW
  • PSW key mask (PKM)
  • PC number (if a stacking PC caused the entry) or a branch address (if a BAKR caused the entry)
  • An eight-byte area that you can change with the modify stacked state (MSTA) instruction

On return from a routine, the PR instruction restores the entry and returns control to the calling program.

Parent topic: Linkage stack

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