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From: Florian Weimer <fw@deneb.enyo.de>
To: Fengkai Sun via Libc-help <libc-help@sourceware.org>
Cc: Fengkai Sun <qcloud1014@gmail.com>
Subject: Re: CHECK_STATIC_TLS in R_X86_64_TPOFF64 type relocation
Date: Sun, 26 Dec 2021 16:48:26 +0100	[thread overview]
Message-ID: <87wnjrjrjp.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <CAF6YOcMeKcekiiLj63ERTYXX_JdJSCSYmz48Qm4N-0B43nUneg@mail.gmail.com> (Fengkai Sun via Libc-help's message of "Sun, 26 Dec 2021 21:29:13 +0800")

* Fengkai Sun via Libc-help:

>> We are trying to perform a static TLS relocation in MAP, but it was
> dynamically loaded.
>
> To the best of my knowledge, I found that R_X86_64_TPOFF64 is for
> Initial-exec TLS model, which only appears in executables.

No, initial-exec in shared objects is fine (as long as static TLS
space is available).

Local-exec TLS in executables does not need relocations, and the link
editor typically relaxes initial-exec TLS reference in main programs
to local-exec TLS, leaving no of them trace (except for the PT_TLS
segment).

  reply	other threads:[~2021-12-26 15:48 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-26 13:29 Fengkai Sun
2021-12-26 15:48 ` Florian Weimer [this message]
2021-12-27  3:05   ` Fengkai Sun

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