z/OS MVS Programming: Extended Addressability Guide
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Changing an EAX value

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

Two instructions can change a program's EAX value:
  • The PC instruction, providing the value on the EAX parameter changes the EAX value for the caller
  • The PR instruction, which restores the EAX value to the value that the caller had before it entered the PC routine.

The program has that EAX value only while the PC routine is running.

Parent topic: EAX-authority to an address space

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