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Re: Really compressed instruction streams

From John Levine <johnl@taugh.com>
Newsgroups comp.arch
Subject Re: Really compressed instruction streams
Date 2026-10-06 02:46 +0000
Organization Taughannock Networks
Message-ID <11a1ndg$n19$1@gal.iecc.com> (permalink)
References <1193vo8$30ki0$1@dont-email.me> <1790288238-5857@newsgrouper.org> <NIvtS.6$MR2.5@fx39.iad> <11a1ap8$3u6ge$2@paganini.bofh.team>

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According to Waldek Hebisch <antispam@fricas.org>:
>>>What happens when somebody (ld.so) writes into code space ??
>> 
>> Generally it doesn't.   The code space is mapped into
>> read-only pages.   The RTLD updates the PLT and GOT, not
>> the code.
>
>AFAICS on popular architectures PLT is code.

It is, but it's position independent read-only code
that jumps through an indirect address in the GOT.

-- 
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly

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Thread

Really compressed instruction streams Thomas Koenig <tkoenig@netcologne.de> - 2026-09-24 20:04 +0000
  Re: Really compressed instruction streams MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-09-24 22:17 +0000
    Re: Really compressed instruction streams BGB <cr88192@gmail.com> - 2026-09-24 18:00 -0500
    Re: Really compressed instruction streams scott@slp53.sl.home (Scott Lurndal) - 2026-09-25 14:39 +0000
      Re: Really compressed instruction streams cross@spitfire.i.gajendra.net (Dan Cross) - 2026-09-25 20:53 +0000
      Re: Really compressed instruction streams antispam@fricas.org (Waldek Hebisch) - 2026-10-05 23:10 +0000
        Re: Really compressed instruction streams John Levine <johnl@taugh.com> - 2026-10-06 02:46 +0000
  Re: Really compressed instruction streams quadibloc@invalid.com (John Savard) - 2026-09-24 22:37 +0000
    Re: Really compressed instruction streams MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-09-25 00:37 +0000
      Re: Really compressed instruction streams scott@slp53.sl.home (Scott Lurndal) - 2026-09-25 14:42 +0000
  Re: Really compressed instruction streams Robert Finch <robfi680@gmail.com> - 2026-09-24 20:56 -0400
    Re: Really compressed instruction streams Thomas Koenig <tkoenig@netcologne.de> - 2026-09-25 18:56 +0000
  Re: Really compressed instruction streams Michael S <already5chosen@yahoo.com> - 2026-09-25 11:54 +0300
    Re: Really compressed instruction streams Thomas Koenig <tkoenig@netcologne.de> - 2026-09-25 15:05 +0000
  Re: Really compressed instruction streams Michael S <already5chosen@yahoo.com> - 2026-09-25 17:39 +0300
  Re: Really compressed instruction streams Stefan Monnier <monnier@iro.umontreal.ca> - 2026-09-25 11:46 -0400
    Re: Really compressed instruction streams BGB <cr88192@gmail.com> - 2026-09-25 16:09 -0500
      Re: Really compressed instruction streams MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-09-25 22:59 +0000
        Re: Really compressed instruction streams BGB <cr88192@gmail.com> - 2026-09-25 18:51 -0500
          Re: Really compressed instruction streams scott@slp53.sl.home (Scott Lurndal) - 2026-09-28 15:26 +0000
            Re: Really compressed instruction streams BGB <cr88192@gmail.com> - 2026-09-28 17:42 -0500
      Re: Really compressed instruction streams BGB <cr88192@gmail.com> - 2026-09-26 03:21 -0500
    Re: Really compressed instruction streams Paul Clayton <paaronclayton@gmail.com> - 2026-09-27 21:12 -0400
      Re: Really compressed instruction streams BGB <cr88192@gmail.com> - 2026-10-01 15:42 -0500

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