15 Jan
2020
15 Jan
'20
1:21 a.m.
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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