From: Tulio Magno Quites Machado Filho <tuliom@ascii.art.br>
To: "Florian Weimer" <fweimer@redhat.com>,
"Michal Suchánek" <msuchanek@suse.de>
Cc: "Lynn A. Boger" <laboger@linux.ibm.com>,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
Subject: Re: PIE binaries are no longer mapped below 4 GiB on ppc64le
Date: Wed, 31 Oct 2018 18:23:37 -0300 [thread overview]
Message-ID: <87efc5n73a.fsf@linux.ibm.com> (raw)
In-Reply-To: <877ehyf1cj.fsf@oldenburg.str.redhat.com>
Florian Weimer <fweimer@redhat.com> writes:
> * Michal Suchánek:
>
>> On Wed, 31 Oct 2018 18:20:56 +0100
>> Florian Weimer <fweimer@redhat.com> wrote:
>>
>>> And it needs to be built with:
>>>
>>> go build -ldflags=-extldflags=-pie extld.go
>>>
>>> I'm not entirely sure what to make of this, but I'm worried that this
>>> could be a regression that matters to userspace.
>>
>> I encountered the same when trying to build go on ppc64le. I am not
>> familiar with the internals so I just let it be.
>>
>> It does not seem to matter to any other userspace.
>
> It would matter to C code which returns the address of a global variable
> in the main program through and (implicit) int return value.
I wonder if this is restricted to linker that Golang uses.
Were you able to reproduce the same problem with Binutils' linker?
--
Tulio Magno
WARNING: multiple messages have this Message-ID (diff)
From: Tulio Magno Quites Machado Filho <tuliom@ascii.art.br>
To: "Florian Weimer" <fweimer@redhat.com>,
"Michal Suchánek" <msuchanek@suse.de>
Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
"Lynn A. Boger" <laboger@linux.ibm.com>
Subject: Re: PIE binaries are no longer mapped below 4 GiB on ppc64le
Date: Wed, 31 Oct 2018 18:23:37 -0300 [thread overview]
Message-ID: <87efc5n73a.fsf@linux.ibm.com> (raw)
In-Reply-To: <877ehyf1cj.fsf@oldenburg.str.redhat.com>
Florian Weimer <fweimer@redhat.com> writes:
> * Michal Suchánek:
>
>> On Wed, 31 Oct 2018 18:20:56 +0100
>> Florian Weimer <fweimer@redhat.com> wrote:
>>
>>> And it needs to be built with:
>>>
>>> go build -ldflags=-extldflags=-pie extld.go
>>>
>>> I'm not entirely sure what to make of this, but I'm worried that this
>>> could be a regression that matters to userspace.
>>
>> I encountered the same when trying to build go on ppc64le. I am not
>> familiar with the internals so I just let it be.
>>
>> It does not seem to matter to any other userspace.
>
> It would matter to C code which returns the address of a global variable
> in the main program through and (implicit) int return value.
I wonder if this is restricted to linker that Golang uses.
Were you able to reproduce the same problem with Binutils' linker?
--
Tulio Magno
next prev parent reply other threads:[~2018-10-31 21:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-31 17:20 PIE binaries are no longer mapped below 4 GiB on ppc64le Florian Weimer
2018-10-31 17:50 ` Michal Suchánek
2018-10-31 17:50 ` Michal Suchánek
2018-10-31 17:54 ` Florian Weimer
2018-10-31 17:54 ` Florian Weimer
2018-10-31 21:23 ` Tulio Magno Quites Machado Filho [this message]
2018-10-31 21:23 ` Tulio Magno Quites Machado Filho
2018-10-31 21:28 ` Florian Weimer
2018-10-31 21:28 ` Florian Weimer
2018-10-31 22:04 ` Tulio Magno Quites Machado Filho
2018-10-31 22:04 ` Tulio Magno Quites Machado Filho
2018-10-31 22:41 ` Michal Suchánek
2018-10-31 22:41 ` Michal Suchánek
2018-10-31 22:24 ` Benjamin Herrenschmidt
2018-10-31 22:24 ` Benjamin Herrenschmidt
2018-11-02 4:38 ` Nick Piggin
2018-11-01 3:55 ` Michael Ellerman
2018-11-01 6:49 ` Alan Modra
2018-11-01 6:49 ` Alan Modra
2018-11-02 9:41 ` Michael Ellerman
2018-11-02 9:41 ` Michael Ellerman
2018-11-01 11:20 ` Florian Weimer
2018-11-01 11:20 ` Florian Weimer
2018-11-02 9:37 ` Michael Ellerman
2018-11-02 9:37 ` Michael Ellerman
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