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Re: [committed, PATCH] Always create dynsym section with dynamic sections
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Faraz Shahbazker <faraz dot shahbazker at imgtec dot com>
- Cc: Binutils <binutils at sourceware dot org>
- Date: Fri, 22 Apr 2016 19:05:35 -0700
- Subject: Re: [committed, PATCH] Always create dynsym section with dynamic sections
- Authentication-results: sourceware.org; auth=none
- References: <20160223003208 dot GA30022 at intel dot com> <571A59A8 dot 4000700 at imgtec dot com> <CAMe9rOqr+E11vmpMV4Fo8Js_nCdsrcKpWKXQCUy+qSjjod=_hg at mail dot gmail dot com> <571A73BE dot 4000709 at imgtec dot com> <CAMe9rOp4nZHfL2=st5-fap84C7zOnnyjrU7e0_+QWe1jYhK6cw at mail dot gmail dot com> <DCB1C42372B1674B8F912A294CCB775A92D4E930 at BADAG02 dot ba dot imgtec dot org> <CAMe9rOpZECsq2U4Gb5CJw=y-vhmd_kDmTa0nZf+eqqTRUqDBKw at mail dot gmail dot com> <571AD1EE dot 1040005 at imgtec dot com>
On Fri, Apr 22, 2016 at 6:37 PM, Faraz Shahbazker
> 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.
>From what you are saying, shouldn't dynsymcount be incremented