* Symbol visibility and bypassing PLT for intra-DSO calls
@ 2012-11-12 8:39 Florian Weimer
2012-11-12 9:01 ` Alexander Monakov
0 siblings, 1 reply; 5+ messages in thread
From: Florian Weimer @ 2012-11-12 8:39 UTC (permalink / raw)
To: gcc-help
Is there a way to use symbol visibility to bypass the PLT for intra-DSO
calls, while still keeping the symbol public? I don't need to support
overriding the symbols from the outside, so the PLT indirection isn't
needed.
--
Florian Weimer / Red Hat Product Security Team
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Symbol visibility and bypassing PLT for intra-DSO calls
2012-11-12 8:39 Symbol visibility and bypassing PLT for intra-DSO calls Florian Weimer
@ 2012-11-12 9:01 ` Alexander Monakov
2012-11-12 9:13 ` Florian Weimer
0 siblings, 1 reply; 5+ messages in thread
From: Alexander Monakov @ 2012-11-12 9:01 UTC (permalink / raw)
To: Florian Weimer; +Cc: gcc-help
On Mon, 12 Nov 2012, Florian Weimer wrote:
> Is there a way to use symbol visibility to bypass the PLT for intra-DSO calls,
> while still keeping the symbol public? I don't need to support overriding the
> symbols from the outside, so the PLT indirection isn't needed.
Why do you need to use the visibility mechanism specifically? From my
understanding, it sounds like you can use -Bsymbolic.
Alexander
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Symbol visibility and bypassing PLT for intra-DSO calls
2012-11-12 9:01 ` Alexander Monakov
@ 2012-11-12 9:13 ` Florian Weimer
2012-11-12 10:22 ` Alexander Monakov
0 siblings, 1 reply; 5+ messages in thread
From: Florian Weimer @ 2012-11-12 9:13 UTC (permalink / raw)
To: Alexander Monakov; +Cc: gcc-help
On 11/12/2012 10:01 AM, Alexander Monakov wrote:
> On Mon, 12 Nov 2012, Florian Weimer wrote:
>
>> Is there a way to use symbol visibility to bypass the PLT for intra-DSO calls,
>> while still keeping the symbol public? I don't need to support overriding the
>> symbols from the outside, so the PLT indirection isn't needed.
>
> Why do you need to use the visibility mechanism specifically? From my
> understanding, it sounds like you can use -Bsymbolic.
It would be sort-of nice to do this at the compiler level, so that the
programmer doesn't have to specify a linker option. And a finer
granularity to control this feature might make sense in some cases.
--
Florian Weimer / Red Hat Product Security Team
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Symbol visibility and bypassing PLT for intra-DSO calls
2012-11-12 9:13 ` Florian Weimer
@ 2012-11-12 10:22 ` Alexander Monakov
2012-11-12 15:31 ` Florian Weimer
0 siblings, 1 reply; 5+ messages in thread
From: Alexander Monakov @ 2012-11-12 10:22 UTC (permalink / raw)
To: Florian Weimer; +Cc: gcc-help
On Mon, 12 Nov 2012, Florian Weimer wrote:
> On 11/12/2012 10:01 AM, Alexander Monakov wrote:
> > On Mon, 12 Nov 2012, Florian Weimer wrote:
> >
> > > Is there a way to use symbol visibility to bypass the PLT for intra-DSO
> > > calls,
> > > while still keeping the symbol public? I don't need to support overriding
> > > the
> > > symbols from the outside, so the PLT indirection isn't needed.
> >
> > Why do you need to use the visibility mechanism specifically? From my
> > understanding, it sounds like you can use -Bsymbolic.
>
> It would be sort-of nice to do this at the compiler level, so that the
> programmer doesn't have to specify a linker option. And a finer granularity
> to control this feature might make sense in some cases.
Is "protected" visibility what you need? From the manual:
Protected visibility is like default visibility except that it indicates
that references within the defining module bind to the definition in that
module. That is, the declared entity cannot be overridden by another module.
Alexander
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: Symbol visibility and bypassing PLT for intra-DSO calls
2012-11-12 10:22 ` Alexander Monakov
@ 2012-11-12 15:31 ` Florian Weimer
0 siblings, 0 replies; 5+ messages in thread
From: Florian Weimer @ 2012-11-12 15:31 UTC (permalink / raw)
To: Alexander Monakov; +Cc: gcc-help
On 11/12/2012 11:22 AM, Alexander Monakov wrote:
>> It would be sort-of nice to do this at the compiler level, so that the
>> programmer doesn't have to specify a linker option. And a finer granularity
>> to control this feature might make sense in some cases.
>
> Is "protected" visibility what you need? From the manual:
>
> Protected visibility is like default visibility except that it indicates
> that references within the defining module bind to the definition in that
> module. That is, the declared entity cannot be overridden by another module.
Yes, this should do it, thanks. I was confused by the
-fvisibility=protected documentation.
--
Florian Weimer / Red Hat Product Security Team
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-11-12 15:31 UTC | newest]
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2012-11-12 8:39 Symbol visibility and bypassing PLT for intra-DSO calls Florian Weimer
2012-11-12 9:01 ` Alexander Monakov
2012-11-12 9:13 ` Florian Weimer
2012-11-12 10:22 ` Alexander Monakov
2012-11-12 15:31 ` Florian Weimer
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