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From: Charles H Sauer <sauer@technologists.com>
To: tuhs@minnie.tuhs.org
Subject: [TUHS] two AIX items [was Re:  History of symbol preemption
Date: Tue, 14 Jan 2020 13:21:34 -0600	[thread overview]
Message-ID: <e7f59486-228b-54b6-2b20-1df152441476@technologists.com> (raw)
In-Reply-To: <CABH=_VTOhJ57t-iWkcV9KYoSmDjy-6-6-sUTVYz-nJDTrprHjw@mail.gmail.com>



On 1/13/2020 1:58 PM, Paul Winalski wrote:

> ...  LInux, AIX and probably other implementations of ELF have a
> feature in the runtime loader called symbol preemption.  When loading

As far as I know, AIX has never used ELF.

On the RT, AIX 1 & 2 used a.out enhanced for basic shared library 
support, designed by Larry Loucks with help from ISC, probably John 
Levine, if I recall correctly.

Starting with AIX 3, AIX used an extended COFF. See Auslander et al, 
"Dynamic Linking and Loading in the AIX System", SA23-2619 RISC 
System/6000 Technology p. 151. (I don't have/know of PDF of SA23-2619.) 
See, also, https://en.wikipedia.org/wiki/XCOFF.

It seems likely that AIX XCOFF supported symbol preemption, I haven't 
tried to determine one way or the other.

AIX on 386 & 370 probably used a.out. Clem probably knows.

An IBM retirees group on Facebook led me to IBM AIX Enhancements and 
Modernization at http://www.redbooks.ibm.com/abstracts/sg248453.html, 
just available yesterday. I tend to think of AIX as abandoned by IBM in 
favor of Linux, but, of course, that isn't really true. I've downloaded 
the PDF, but not looked inside.

Charlie

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  parent reply	other threads:[~2020-01-14 19:29 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 19:58 [TUHS] " Paul Winalski
2020-01-13 20:46 ` Rico Pajarola
2020-01-13 21:04   ` Clem Cole
2020-01-13 21:40     ` Rico Pajarola
2020-01-13 21:44       ` Paul Winalski
2020-01-13 21:45         ` Rico Pajarola
2020-01-13 22:20           ` Larry McVoy
2020-01-13 21:42     ` Paul Winalski
2020-01-13 22:53       ` Henry Bent
2020-01-14  0:31         ` Clem Cole
2020-01-14  2:53 ` Rob Gingell
2020-01-14 19:21 ` Charles H Sauer [this message]
2020-01-14 20:31   ` [TUHS] two AIX items [was " Clem Cole
2020-01-14 23:22   ` Kevin Bowling
2020-01-15 16:41   ` Paul Winalski

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