Environment of the SRB routine at entry

At entry, an SRB routine is in supervisor state, primary ASC mode, enabled and unlocked unless you specified LLOCK=YES, in which case the local lock is held. The general purpose registers contain the following:

Register

Contents

0

SRB address if SCHEDULE macro is used; zero if IEAMSCHD is used.

1

If the IEAMSCHD macro is used, the value provided by the PARM parameter; or if SCHEDULE is used, the SRBPARM field of the SRB.

2

If the IEAMSCHD macro is used with FRRADDR=YES, or if SCHEDULE is used with FRR=YES, the 24-bit address of the FRR parameter area; otherwise, not part of the intended programming interface.

14

Return address.

15

Entry point address.