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Message-ID: <CAOYuCc2_-CeHwv-mJbhU_6dVd7Qu7fht8M26eQ9tqfOhFsTOJw@mail.gmail.com>
Date: Wed, 15 Jun 2016 22:23:36 +0800
From: Lei Zhang <zhanglei.april@...il.com>
To: musl@...ts.openwall.com
Cc: Luca Barbato <lu_zero@...too.org>, Khem Raj <raj.khem@...il.com>
Subject: Re: Dynamic linker name
2016-06-15 21:00 GMT+08:00 Bobby Bingham <koorogi@...rogi.info>:
> On Wed, Jun 15, 2016 at 05:39:51PM +0800, Lei Zhang wrote:
>> 2016-06-15 17:31 GMT+08:00 Luca Barbato <lu_zero@...too.org>:
>> > On 15/06/16 10:16, Lei Zhang wrote:
>> >> i386
>> >> x86_64
>> >> powerpc
>> >> powerpc64
>> >> mips
>> >> mipsel
>> >> mips64
>> >> mips64el
>> >>
>> >> which should just work out the box with my previous patch. I'll take
>> >> care of x32 and ARM (subarchs and ABIs) with further patches.
>> >
>> > Powerpc can be little endian as well but it can wait the arm patch as well.
>>
>> I've only seen powerpc64le; don't know if 32-bit powerpc doesn't
>> support little endian.
>
> There are a couple things you should know about musl's support for
> powerpc64 which mean you probably shouldn't add it.
>
> Two different ABIs exist for powerpc64. The new one is sometimes called
> powerpc64le. While it's typically used on little endian, there's no
> reason it can't be used on big endian systems as well. Musl only
> supports the new ABI, but supports it for both big and little endian.
> The arch names used by musl for them are:
I just did a quick search; are these two ABIs called "ppc64 elf" and
"ppc64 elf v2" respectively?
> Last I checked, clang only supported using IBM double-double for long
> double on powerpc64. If this is still true, then clang cannot match
> musl's ABI on powerpc64.
I think powerpc64 needs no special handling anyway (unlike ARM); it
just happens to be supported by the patch. OTOH, do you think I should
*explicitly* disallow clang being configured against musl when
targeting powerpc64? I can put that logic in my next patch if it makes
sense.
Thanks,
Lei
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