IATXSNFS (Interface to the SNARJP FAILDSP Processor)

The IATXSNFS macro allows you to indicate that a specified DSP should be failed, with a failure code, upon recognition of an error.

If you specify the constant form of the CODE=parameter, this macro requires that JES3 macro IATYDUM be expanded in the module in which IATXSNFS is coded. If IATYDUM is not coded, an assembly error will occur.

The routine using this macro must set register 11 according to the SNA RJP convention. In this convention, the high-order bit of register 11 is used to indicate the type of state as follows:

If the bit is off (0), it is running under the FCT.
If the bit is on (1), it is running under the IRB or the SRB.

To distinguish an IRB from an SRB, test the PSATOLD word in the PSA. If this word is zero, the SRB is active. If the word is not zero, the IRB is active.