z/OS JES2 Installation Exits
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Registers

z/OS JES2 Installation Exits
SA32-0995-00

  • Equated symbols for general purpose registers 0 to 15 (R0-R15) should be used.
  • The general-purpose register equates used throughout JES2 are as follows:
    R0
    Parameter passing
    R1
    Parameter passing
    R11
    HCT addressability (JES2 main task)
    R11
    HCT addressability (JES2 subtasks)
    R11
    HFCT addressability (FSS)
    R11
    HCCT addressability
    R12
    Local addressability if $SAVE/$RETURN
    R13
    PCE addressability (JES2 main task)
    R13
    Save area address (FSS)
    R13
    Save area address
    R14
    Return address
    R15
    Entry address/return code
Parent topic: Hints for coding JES2 exit routines

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