Re: The different groups and segments of object files

From	Hans-Peter Diettrich <DrDiettrich1@netscape.net>
Newsgroups	comp.compilers
Subject	Re: The different groups and segments of object files
Date	2020-06-25 22:52 +0200
Organization	Compilers Central
Message-ID	<20-06-022@comp.compilers> (permalink)
References	<20-06-004@comp.compilers> <20-06-006@comp.compilers> <20-06-021@comp.compilers>

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Am 25.06.2020 um 17:13 schrieb Johann 'Myrkraverk' Oskarsson:

> Do you know if group names have any meaning in the modern world?  DGROUP
> seems like a traditional name.  The OW disassembler tells me this when I
> apply it to output from the C compiler, GROUP: 'DGROUP' CONST, CONST2,
> _DATA.

The segment groups allowed for a single common base (selector) to access
data segments from various object modules.

> This group does not seem to list the _TEXT segment, which is
> where the code lives.

Right, DGROUP names the default DATA group. One could have multiple data
groups, equivalent to FORTRAN COMMON areas.

I was wondering about the use of the segment registers of the 8086 until
I came across the segment group model. Only then those composite
addresses made sense, without reloading a sement register with every
single data access.

DoDi

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The different groups and segments of object files Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.com> - 2020-06-19 23:22 +0800
  Re: The different groups and segments of object files gah4@u.washington.edu - 2020-06-19 14:12 -0700
    Re: The different groups and segments of object files gah4@u.washington.edu - 2020-06-21 01:50 -0700
    Re: The different groups and segments of object files Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2020-06-25 22:41 +0800
    Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-25 22:40 +0200
      Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-26 00:09 +0200
        Re: The different groups and segments of object files gah4@u.washington.edu - 2020-07-02 00:36 -0700
  Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-20 16:01 +0200
    Re: The different groups and segments of object files Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2020-06-25 23:13 +0800
      Re: The different groups and segments of object files Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2020-06-25 22:52 +0200

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