Re: The different groups and segments of object files

Hans-Peter Diettrich <DrDiettrich1@netscape.net>
Thu, 25 Jun 2020 22:52:49 +0200

          From comp.compilers
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The different groups and segments of object files johann@myrkraverk.com (Johann 'Myrkraverk' Oskarsson) (2020-06-19)
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From: Hans-Peter Diettrich <DrDiettrich1@netscape.net>
Newsgroups: comp.compilers
Date: Thu, 25 Jun 2020 22:52:49 +0200
Organization: Compilers Central
References: 20-06-004 20-06-006 20-06-021
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="38071"; mail-complaints-to="abuse@iecc.com"
Keywords: code, history
Posted-Date: 25 Jun 2020 17:09:03 EDT
In-Reply-To: 20-06-021

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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