The following register conventions must be observed when calling PERCON as a subprogram:
Register 1: | address of the address list. | |
Register 13: | address of a save area comprising 18 words; this area must be made available by the main program. | |
Register 14: | return address for the main program. | |
Register 15: | address of the entry point PERCONU or PCNSR9. |
Note
PERCON carries out its own STXIT call. As a result, any STXIT management block created in the main program (specified assignment “STXIT event class - STXIT routine”) is modified and supplemented. The STXIT routines defined in the main program are no longer activated (exception: PERCON does not change the RTIMER assignment).