----- CMSGUTS FORUM appended at 09:51:20 on 90/02/02 GMT (by XAVIER at PARIS) -
Subject: Format of a CMS module
Ref:     append at 00:13:20 on 90/02/02 GMT (by WILBERTL at SJFEVMD)
 
    I don't remember having seen any documentation on CMS mdoules.
But looking at LOADMOD/GENMOD (in DMSMOD ASSEMBLE), a module file
has the following structure:
 
 a) RECFM=F   then it is a transient module
              (only 1 record that contains the code)
 
 b) RECFM=V   a module generated at x'20000'
 
    Record 1  = the module header (80 bytes)
                it is a copy of the loader information from NUCON
 
 0.4     STRTADDR DC    1F'0'          MODULE STARTING ADDRESS
 4.4     FRSTLOC  DC    1F'0'          MODULE BEGINNING ADDRESS
 8.4     LASTLOC  DC    1F'0'          MODULE ENDING ADDRESS
 C.4     LOCCNT   DC    1F'0'          LOADER LOCATION COUNTER
10.4     LDRADDR  DC    1F'0'          LOADER RETURN ADDRESS
14.4     LDRRTCD  DC    1F'0'          LOADER RETURN CODE
18.8     PSW      DC    1D'0'          USER'S STARTING PSW
20.4     LDRFLAGS DC    1F'0'          LOADER FLAGS
24.4     PRHOLD   DC    1F'0'          PSEUDO REGISTER COUNTER
28.2     TBENT    DC    H'0'           INITIALIZE TABLE ENTRIES TO
         *                             ZEROES
2C.1     UNRES    DC    X'00'
2D.1     MODFLGS  DC    1X'00'         MOD FLAGS
         ...........
 
         Some of it is meaningless....
 
    Record 2  = the code itself (entry point STRTADDR)
    Record 3  = the code size = LASTLOC - FRSTLOC
    ............
    Record n  = (as many 65535 records as needed)
 
    Record n+1= the MAP (if GENMODed with the MAP option)
                TBENT = the number of map entries (0 if NOMAP)
                each entry has a length of 20 bytes
 
    Record n+2= the relocation information (option RLDSAVE on LOAD)
                each entry has a length of 4 bytes (5 bytes on CMS/XA)
 
    I have never seen modules where the MAP or RLDSAVE information
span over multiple records. I don't know if this is possible..
 
          Xavier.            Paris Scientific Center