z/OS JES3 Customization
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Register Conventions to Follow

z/OS JES3 Customization
SA32-1006-00

Register conventions are as follows:
  • Registers 0, 1, 2, 14, and 15 are destroyed by this macro.
  • Register 0 can only be specified for the TATPTR= parameter.
  • Register 1 can only be specified for the FDB= parameter.
  • Registers 2, 14, and 15 cannot be used for the return parameters (ERROR=, and NORMAL=).
  • All other parameters may specify registers 3-10.
Parent topic: IATXJDS (Job Data Set Control Block Access Routines)

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