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From: Florian Weimer <fweimer@redhat.com>
To: Luis Machado via Libc-alpha <libc-alpha@sourceware.org>
Cc: "gdb@sourceware.org" <gdb@sourceware.org>,
	 Luis Machado <luis.machado@linaro.org>,
	 doko@debian.org
Subject: Re: GDB shared library tracking with stap probes x _dl_debug_state
Date: Fri, 07 May 2021 22:44:16 +0200	[thread overview]
Message-ID: <878s4qb7fj.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <b0b35028-2463-dd00-14af-22be2e7b6ff6@linaro.org> (Luis Machado via Libc-alpha's message of "Fri, 7 May 2021 16:42:03 -0300")

* Luis Machado via Libc-alpha:

> That's all fine, but there is one small detail that doesn't work for
> armhf, and that is discovering if we're dealing with a PC that is arm 
> mode or thumb mode.

Is it possible to recognize Arm mode vs thumb mode based on the NOP
encoding at the probe address?

> 2 - Not stripping ld.so/glibc. I can't determine the impact of this
> choice, but distros strip binaries for a reason. Having to carry all 
> symbols for a particular library may not be desirable.

We are switching Fedora to not strip ld.so, primarily for introspection
purposes in Systemtap.

(In Fedora, we've preserved the symbol table for ages, to make valgrind
work.)

Thanks,
Florian


  reply	other threads:[~2021-05-07 20:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-07 19:42 Luis Machado
2021-05-07 20:44 ` Florian Weimer [this message]
2021-05-07 21:44   ` Luis Machado
2021-05-07 21:56     ` Sergio Durigan Junior
2021-05-08 10:55       ` Florian Weimer
2021-05-10 14:16         ` Luis Machado
2021-05-11  8:00           ` Ulrich Weigand
2021-05-24 14:22           ` Luis Machado

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