From: Faraz Shahbazker <faraz.shahbazker@imgtec.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Binutils <binutils@sourceware.org>
Subject: Re: [committed, PATCH] Always create dynsym section with dynamic sections
Date: Sat, 23 Apr 2016 01:38:00 -0000 [thread overview]
Message-ID: <571AD1EE.1040005@imgtec.com> (raw)
In-Reply-To: <CAMe9rOpZECsq2U4Gb5CJw=y-vhmd_kDmTa0nZf+eqqTRUqDBKw@mail.gmail.com>
On 04/22/16 16:24, H.J. Lu wrote:
> On Fri, Apr 22, 2016 at 2:49 PM, Faraz Shahbazker
> <Faraz.Shahbazker@imgtec.com> wrote:
>> On 04/22/2016 12:28 PM, H.J. Lu wrote:
>>> On Fri, Apr 22, 2016 at 11:55 AM, Faraz Shahbazker
>>>> + if (dynsymcount != 0 || elf_hash_table (info)->dynamic_sections_created)
>>>> + ++dynsymcount;
>>>
>>> Are you saying dynamic_sections_created is 0 for MIPS here
>>> and will become 1 later?
>>
>> No, it will remain 0. The link is static, but the hash_table is still used to
>> record global symbols that have GOT relocations against them. Ofc, this
>> hash_table does not result in creation of a dynsym section, because well,
>> dynamic_sections_created is 0.
>>
>> Check the list of callers to bfd_elf_link_record_dynamic_symbol(), a number of
>> architectures use the link_hash_table in situations where it is not clear whether it is
>> being used to track dynamic symbols for a dynamic executable, as it is for x86.
>>
>
> So MIPS doesn't have dynamic symbols in this case. It just borrows
> dynsymcount for different purpose. Is this correct?
Not quite! MIPS is expecting dynsymcount to count the number of symbols
that would have gone in to the .dynsym, even for a static executable. That way
parts of the arch-specific code can remain agnostic to the static/dynamic nature
of the link. It may not be used exactly as documented, but its not being used
for what one would call a different purpose.
All we need is for handling of dynsymcount when renumbering to be consistent with
its initialization. If the initial increment for a NULL symbol was not gated by
dynamic_sections_created, then the increment when renumbering should also not.
If the increment when renumbering has to be gated by dynamic_sections_created,
then the initial increment must also be so.
Regards,
Faraz Shahbazker
next prev parent reply other threads:[~2016-04-23 1:38 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 0:33 H.J. Lu
2016-04-22 17:04 ` Faraz Shahbazker
2016-04-22 18:11 ` H.J. Lu
2016-04-22 18:56 ` Faraz Shahbazker
2016-04-22 19:29 ` H.J. Lu
2016-04-22 21:49 ` Faraz Shahbazker
2016-04-22 22:57 ` H.J. Lu
2016-04-22 23:09 ` Faraz Shahbazker
2016-04-22 23:24 ` H.J. Lu
2016-04-22 23:25 ` H.J. Lu
2016-04-23 1:38 ` Faraz Shahbazker [this message]
2016-04-23 2:05 ` H.J. Lu
2016-04-23 2:32 ` Faraz Shahbazker
2016-04-23 12:27 ` H.J. Lu
2016-04-23 15:25 ` Faraz Shahbazker
2016-04-23 15:36 ` H.J. Lu
2016-04-23 19:26 ` Faraz Shahbazker
2016-04-24 1:43 ` H.J. Lu
2016-04-25 2:18 ` Faraz Shahbazker
2016-04-25 12:47 ` H.J. Lu
2016-04-25 13:41 ` Alan Modra
2016-04-25 16:03 ` H.J. Lu
2016-04-26 2:08 ` Alan Modra
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