From: Luca Boccassi <bluca@debian.org>
To: Nick Clifton <nickc@redhat.com>,
Fangrui Song <maskray@google.com>,
binutils@sourceware.org, Alan Modra <amodra@gmail.com>
Subject: Re: [PATCH] ld: Support customized output section type
Date: Wed, 02 Feb 2022 11:46:12 +0000 [thread overview]
Message-ID: <e79deca6d3a0a2f04091d7a32220cc2f5e6d9b22.camel@debian.org> (raw)
In-Reply-To: <d87a1f58-087e-82f1-72d9-43e0bba9c15a@redhat.com>
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On Wed, 2022-02-02 at 11:36 +0000, Nick Clifton wrote:
> Hi Fangrui,
>
> > The current output section type allows to set the ELF section type to
> > SHT_PROGBITS or SHT_NOLOAD. This patch allows an arbitrary section value
> > to be specified. Some ELF section type names are supported as well,
>
> Thanks for the patch submission. I am regression testing it at the moment
> but in the meantime a couple of things stood out for me:
>
>
> > +@item TYPE = @var{type}
> > +Set the section type to the integer @var{type}. For the ELF output
> > +file, some type names (e.g. @code{SHT_NOTE}) are also allowed for
> > +@var{type}.
>
> Rather than having users guess, it would probably be best to list which
> type names are supported.
>
> Also it is probably worth documenting that it is the user's fault if they
> set the section type to something which has special semantics (eg SHT_GROUP)
> but then they do not also arrange for whatever necessary support that feature
> needs. Something like: "it is the user's responsibility to ensure that
> any special requirements of the section type are met".
>
>
>
> > + case type_section:
> > + if (os->sectype_value->type.node_class == etree_name
> > + && os->sectype_value->type.node_code == NAME)
> > + {
> > + const char *name = os->sectype_value->name.name;
> > + if (strcmp (name, "SHT_PROGBITS") == 0)
> > + type = SHT_PROGBITS;
> > + else if (strcmp (name, "SHT_NOTE") == 0)
> > + type = SHT_NOTE;
> > + else if (strcmp (name, "SHT_NOBITS") == 0)
> > + type = SHT_NOBITS;
> > + else if (strcmp (name, "SHT_INIT_ARRAY") == 0)
> > + type = SHT_INIT_ARRAY;
> > + else if (strcmp (name, "SHT_FINI_ARRAY") == 0)
> > + type = SHT_FINI_ARRAY;
> > + else if (strcmp (name, "SHT_PREINIT_ARRAY") == 0)
> > + type = SHT_PREINIT_ARRAY;
> > + else
> > + einfo (_ ("%F%P: invalid type for output section `%s'\n"),
> > + os->name);
>
> It might be worth adding SHT_STRTAB to this list, as I can imagine some
> weird sceanario where someone would want it.
>
>
> Also - given that this is a new feature, there really ought to be an entry
> for it in the ld/NEWS file.
Hi,
Does this patch allow specifying both this new attribute and the
READONLY attribute? It is required for our use case, and cannot be used
otherwise.
--
Kind regards,
Luca Boccassi
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next prev parent reply other threads:[~2022-02-02 11:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-02 7:10 Fangrui Song
2022-02-02 11:36 ` Nick Clifton
2022-02-02 11:46 ` Luca Boccassi [this message]
2022-02-02 18:32 ` Fangrui Song
2022-02-03 18:36 ` Luca Boccassi
2022-02-03 19:46 ` Fangrui Song
2022-02-03 20:04 ` Luca Boccassi
2022-02-03 20:48 ` Fangrui Song
2022-02-04 16:05 ` Michael Matz
2022-02-21 19:35 ` Mike Frysinger
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