List-form keyword

The format of the MF keyword for the list form is:

MF={L|(L,address[,label])}

where:

L

specifies that this is the list form of the macro.

If you code MF=L, without the address parameter, then,

Register notation and expressions that generate S-type address constants cannot be used
The parameter list is built in line, which means that the program is not reentrant if the parameter list is modified at execution.

address

specifies the address of a remote area in which the macro expansion builds a parameter list. Coding the address parameter will result in generating executable code to initialize the remote parameter list. You can modify this parameter list with later calls to the execute form or update it with later invocations of the list form using the same address parameter. The area must begin on a fullword boundary and be large enough for the parameter list. You can specify the address in register notation or as an expression valid for a relocatable A-type address constant or a direct or indirect S-type address constant.

label

specifies a unique name used in an EQU instruction in the expansion of the macro. Label is equated to the length of the parameter list. You do not have to know the length of the parameter list if you code label; the expansion of the macro determines the amount of storage required.

The size, in fullwords, of a parameter list is:

For GENCB, 4, plus 3 times the number of ACB, EXLST, or RPL keywords specified (plus 1 for DDNAME, EODAD, JRNAD, LERAD, or SYNAD)
For MODCB, 3, plus 3 times the number of ACB, EXLST, or RPL keywords specified (plus 1 for DDNAME, EODAD, JRNAD, LERAD, or SYNAD)
For SHOWCB, 5, plus 2 times the number of fields specified in the FIELDS keyword
For TESTCB, 8 (plus 1 for either DDNAME, STMST, EODAD, JRNAD, LERAD, or SYNAD).

If you code MF=(L,address,label), the parameter list is built in the remote area specified. The expansion of the macro equates label with the length of the parameter list.