From: "H.J. Lu" <hjl.tools@gmail.com>
To: Jan Beulich <JBeulich@novell.com>
Cc: GCC Development <gcc@gcc.gnu.org>,
x32-abi@googlegroups.com, Jakub Jelinek <jakub@redhat.com>,
Binutils <binutils@sourceware.org>,
GNU C Library <libc-alpha@sourceware.org>,
Jan Hubicka <hubicka@ucw.cz>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: x32 psABI draft version 0.2
Date: Fri, 18 Feb 2011 17:53:00 -0000 [thread overview]
Message-ID: <AANLkTi=fL7qVjcyF9JLHaJk6m_d99EaH9YkEv0VJLXKN@mail.gmail.com> (raw)
In-Reply-To: <4D5E37C702000078000329DE@vpn.id2.novell.com>
On Fri, Feb 18, 2011 at 12:11 AM, Jan Beulich <JBeulich@novell.com> wrote:
>>>> On 17.02.11 at 18:59, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>> On Thu, Feb 17, 2011 at 8:11 AM, Jan Beulich <JBeulich@novell.com> wrote:
>>>>>> On 17.02.11 at 16:49, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>>>> On Thu, Feb 17, 2011 at 7:44 AM, Jan Hubicka <hubicka@ucw.cz> wrote:
>>>>>> > According to Mozilla folks however REL+RELA scheme used by EABI leads
>>>>>> > to significandly smaller libxul.so size
>>>>>> >
>>>>>> > According to http://glandium.org/blog/?p=1177 the difference is about 4-5MB
>>>>>> > (out of approximately 20-30MB shared lib)
>>>>>>
>>>>>> This is orthogonal to x32 psABI.
>>>>>
>>>>> Understood. I am just pointing out that x86-64 Mozilla suffers from startup
>>>>> problems (extra 5MB of disk read needed) compared to both x86 and ARM EABI
>>>>> because x86-64 ABI is RELA only. If x86-64 ABI was REL+RELA like EABI is, we
>>>>> would not have this problem here.
>>>>>
>>>>
>>>> If people want to see REL+RELA in x32, they have to contribute codes.
>>>
>>> That's exactly the wrong way round: First the specification has to allow
>>> for (but not require) it, and only then does it make sense to write code.
>>>
>>
>> No, it has to be supported at least by static linker and dynamic
>> linker. Otherwise, no one can use it.
>
> I'm afraid I have to disagree: ELF (and the psABI) is not specific to
> a particular OS, and hence it allowing something doesn't mean the
> OS ABI may not restrict it. Hence the psABI first has to at least not
> forbid something (as it currently does for REL on x86-64), in order
> for an implementation of that something to make sense.
>
> Jan
>
>
How about only allowing REL relocations in executables and DSOes?
BTW, the psABI source is available on hjl/x32 banch at
http://git.kernel.org/?p=devel/binutils/hjl/x86-64-psabi.git;a=summary
--
H.J.
next prev parent reply other threads:[~2011-02-18 17:53 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-16 19:22 H.J. Lu
2011-02-16 20:04 ` H. Peter Anvin
2011-02-16 20:29 ` Roland McGrath
2011-02-16 20:35 ` Chris Metcalf
2011-02-16 20:39 ` Andrew Pinski
2011-02-16 20:46 ` H.J. Lu
2011-02-16 22:13 ` Chris Metcalf
2011-02-17 8:35 ` Jan Beulich
2011-02-17 12:14 ` H.J. Lu
2011-02-17 16:14 ` John Reiser
2011-02-17 17:59 ` Jakub Jelinek
2011-02-17 14:29 ` Jakub Jelinek
2011-02-17 15:22 ` Jan Hubicka
2011-02-17 15:30 ` H.J. Lu
2011-02-17 15:45 ` Jan Hubicka
2011-02-17 15:49 ` H.J. Lu
2011-02-17 16:10 ` Jan Beulich
2011-02-17 17:59 ` H.J. Lu
2011-02-18 8:10 ` Jan Beulich
2011-02-18 17:53 ` H.J. Lu [this message]
2011-02-18 20:32 ` Jan Hubicka
2011-02-21 8:04 ` Jan Beulich
2011-02-17 18:07 ` Jakub Jelinek
2011-02-17 19:56 ` H. Peter Anvin
2011-02-17 22:50 ` Jan Hubicka
2011-02-17 23:00 ` H. Peter Anvin
2011-02-17 23:07 ` Jakub Jelinek
2011-02-18 8:49 ` Jan Beulich
2011-02-17 18:14 ` Joseph S. Myers
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