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Re: x32 psABI draft version 0.2
- From: "Jan Beulich" <JBeulich at novell dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>,"H. Peter Anvin" <hpa at zytor dot com>
- Cc: "GCC Development" <gcc at gcc dot gnu dot org>,<x32-abi at googlegroups dot com>, "Binutils" <binutils at sourceware dot org>, "GNU C Library" <libc-alpha at sourceware dot org>
- Date: Thu, 17 Feb 2011 08:35:26 +0000
- Subject: Re: x32 psABI draft version 0.2
- References: <AANLkTindyH6koj0dCn1nxU9Cu3XUtg3XfvTnt_EWD13Q@mail.gmail.com> <4D5C2DD2.10608@zytor.com>
>>> 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!
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.
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.
Finally, shouldn't R_X86_64_GLOB_DAT and R_X86_64_JUMP_SLOT
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?
Jan