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Re: x32 psABI draft version 0.2


On Thu, Feb 17, 2011 at 12:35 AM, Jan Beulich <JBeulich@novell.com> wrote:
>>>> On 16.02.11 at 21:04, "H. Peter Anvin" <hpa@zytor.com> wrote:
>> On 02/16/2011 11:22 AM, H.J. Lu wrote:
>>> Hi,
>>>
>>> I updated ?x32 psABI draft to version 0.2 to change x32 library path
>>> from lib32 to libx32 since lib32 is used for ia32 libraries on Debian,
>>> Ubuntu and other derivative distributions. The new x32 psABI is
>>> available from:
>>>
>>> https://sites.google.com/site/x32abi/home
>>>
>>
>> I'm wondering if we should define a section header flag (sh_flags)
>> and/or an ELF header flag (e_flags) for x32 for the people unhappy about
>> keying it to the ELF class...
>
> Thanks for supporting this!

I am not convinced.

> Besides that I also wonder why all the 64-bit relocations get
> marked as LP64-only. It is clear that some of them can be useful
> in ILP32 as well, and there's no reason to preclude future uses
> even if currently no-one can imagine any.

We can revisit them when someone finds a use for them.

> Furthermore, it seems questionable to continue to require rela
> relocations when for all normal ones (leaving aside the 8- and 16-
> bit ones) the addend can fit in the relocated field.

Rela is much nicer to work with.

> Finally, shouldn't R_X86_64_GLOB_DAT and R_X86_64_JUMP_SLOT

Fixed in git.

> also have a field specifier of wordclass rather than word64 (though
> 'wordclass' by itself would probably be wrong if the tying of the ABI
> to the ELF class was eliminated)? And how about R_X86_64_*TP*64
> and R_X86_64_TLSDESC?

Those are 64bits due to the way the code sequence generated
by gcc.

-- 
H.J.


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