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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
References: <CAF6YOcMeKcekiiLj63ERTYXX_JdJSCSYmz48Qm4N-0B43nUneg@mail.gmail.com>
Date: Sun, 26 Dec 2021 16:48:26 +0100
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")
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* 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).