The exits receive control with these characteristics:

• Supervisor state
• Key 0
• APF-authorized
• TCB mode
• Address Space Control mode=access register mode
• AMODE(31) orAMODE(64)

  The exit receives control in AMODE(64) if the service was invoked in AMODE(64); otherwise the exit receives control in AMODE(31). If you have a callable service exit for a service which supports invocation by an AMODE(64) caller, once HCR7720 is installed, you should recode your exit to be sure it can handle being invoked in AMODE(64).

• RMODE(ANY)

The exits can change the characteristics during their processing. However, the exits must return to ICSF with the same characteristics as on entry.