Re: CMS program management tutorial - Reslib - MACLIB

The CMS transient area is at xE000 and allows programs up to 8K to run.

The CMS user area is at x20000 and allow programs up to the size of the virtual machine - 20000 - CMS high storage to run.

--- In [email protected], Mike Ward <antebios1153@...> wrote:
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> Is it 20000 or 2000?
> 
> --- On Sat, 8/7/10, Robert O'Hara <rohara@...> wrote:
> 
> From: Robert O'Hara <rohara@...>
> Subject: [H390-VM] Re: CMS program management tutorial - Reslib - MACLIB
> To: [email protected]
> Date: Saturday, August 7, 2010, 4:00 PM
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>       I should have mentioned that this is why you can't issue the MACLIB command when in CMS SUBSET mode (from within EDIT).  EDIT is occupying 20000...
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> Bob
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> 
> --- In [email protected], "Robert O'Hara" <rohara@> wrote:
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> >
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> > Mike,
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> > 
> 
> > There are two problems with your program.  First of all, you need a "fence" at the end of the parameter list to SVC 202:
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> >          DC    8X'FF'
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> > Your program is dying because it is being overlaid by the MACLIB command (which I have documented in the help file as a transient command:  it is not -- I will fix that).
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> > 
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> > If you do this 
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> > LOAD SVMAC (ORIGIN 900000
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> > 
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> > it will load above MACLIB, which loads at 20000.
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> > 
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> > Or you can do this
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> > RESLIB LOAD SVMAC
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> > 
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> > then 
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> > SVMAC
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> > 
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> > and it should work.
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> > 
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> > Bob
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> > 
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> > --- In [email protected], Mike Stramba <mikestramba@> wrote:
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> > >
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> > > Hi Bob,
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> > > 
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> > > I just revisited the "RESLIB" technique trying to run another program - MACLIB.
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> > > 
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> > > I'm getting erratic results, sometimes it's working, sometimes not.
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> > > 
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> > > Is there something special about MACLIB ?
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> > > 
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> > > 
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> > > SVMAC    CSECT
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> > >          LR    R12,R15
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> > >          USING SVMAC,R12
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> > >          LA    R1,MACLIST
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> > >          SVC   202
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> > > EXIT     BR    R14
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> > > MYERR    WRTERM 'ERROR FROM SVC 202'
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> > >          B     EXIT
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> > > *
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> > > MACLIST  DS  0D
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> > >          DC    CL8'MACLIB'
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> > > P1       DC    CL8'GEN'
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> > >          DC    CL8'FOO'
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> > > FNAME    DC    CL8'GWTO'
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> > >          REGEQU
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> > >          END
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> > > 
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> > > 
> 
> > > On 7/13/10, Robert O'Hara <rohara@> wrote:
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> > > > So where can CMS programs run?
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> > > >
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> > > > 1. The nucleus.  CMS commands such as STATE are part of the nucleus; their
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> > > > code is resident in memory at all times.
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> > > >
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> > > > 2. The user area at x20000.  This is where user programs run by default.
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> > > > They can be as large as the virtual machine allows.  Programs written in
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> > > > COBOL, FORTRAN, PL/I, etc all run here.  And the CMS EDIT command runs here.
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> > > >
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> > > > 3. The transient area at xE000.  Programs running here can be no larger than
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> > > > 8K.  Many CMS commands such as LISTFILE run here.  When you invoke CMS
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> > > > SUBSET mode from within EDIT, you can only run transient commands, because
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> > > > the editor is occupying the user area.  Thus you can call LISTFILE from your
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> > > > PL/I program, but not EDIT.
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> > > >
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> > > > 4. The CMS shared segment at 15MB in the SixPack.  CMS defines a shared
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> > > > segment where EDIT, EXEC, and OS simulation code can reside.  But because
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> > > > the shared segment is not guarenteed to be there (define your VM to 16MB and
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> > > > it won't be), the above code will run in the user area or self-load into
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> > > > high memory.
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> > > >
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> > > > 5. Resident memory via the RESLIB program.  The SixPack features a program
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> > > > called RESLIB that lets you in effect dynamically extend the CMS nucleus.
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> > > > It is similar to NUCXLOAD introduced in VM/SP (but not compatible with it).
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> > > > These programs reside in high memory.
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> > > >
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> > > > In the forthcoming SixpPack v1.2 I use RESLIB to load REXX and the GCCLIB C
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> > > > runtime routines into high memory.  Thus a REXX program can call any CMS
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> > > > program, regardless of where it runs.
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> > > >
> 
> > > > So if you want to write a program that invokes EDIT, instead of
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> > > >    ASSEMBLE CALLEDIT
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> > > >    LOAD CALLEDIT
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> > > >    GENMOD CALLEDIT
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> > > >    CALLEDIT
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> > > > which will fail, do this:
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> > > >    ASSEMBLE CALLEDIT
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> > > >    RESLIB LOAD CALLEDIT
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> > > >    CALLEDIT
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> > > > Now your program is resident in high storage; you can repeatedly invoke it
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> > > > without calling RESLIB again.  Type HELP RESLIB in CMS on the SixPack for
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> > > > more information.
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> > > >
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> > > > Bob
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> > >
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> >
>