x32 psABI draft version 0.2

H.J. Lu hjl.tools@gmail.com
Thu Feb 17 17:59:00 GMT 2011


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.

-- 
H.J.



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