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From: ews00461@uxa.cso.uiuc.edu
Newsgroups: comp.sys.mac.programmer
Subject: MPW Tools Globals ?
Message-ID: <1234600049@uxa.cso.uiuc.edu>
Date: 1 Aug 90 15:06:00 GMT
Lines: 19
Nf-ID: #N:uxa.cso.uiuc.edu:1234600049:000:770
Nf-From: uxa.cso.uiuc.edu!ews00461    Aug  1 10:06:00 1990



How do MPW tools handle global data ?  I'm trying to develop my
own format for  dynamically linked code, something along the lines
of MPW tools.  I want to be able to execute the code inside a file,
like tools, and have global data.  Is A5 patched on entry to the
tool ?  Do tools have their own jump table separate from MPW Shell ?
Don't tools access some of MPW's A5 globals?  How do tools call
MPW stdio ?  What code is contained in these stdio libraries ?

While we're close to the topic, how do some MPW compilers handle >32k
of global data ?  The 68000 cannot access this using 16 bit
displacement from a5.

Any discussion on this/these topics would be interesting to me,
including explanations of XCMD's, Excel DLL's, XFCN, etc...

Eric W. Sink
e-sink@uiuc.edu