Re: [RFC PATCH V2 00/10] port C-SKY to glibc

[Florian Weimer <fweimer@redhat.com>]

On 04/08/2018 10:29 AM, Mao Han wrote:
> On Sun, Apr 08, 2018 at 09:50:16AM +0200, Florian Weimer wrote:
> Hi,
>> * Mao Han:
>>
>>> CK610 is the second-generation CPU of CSKY, fullycompatible with M*Core.
>>> CK807/CK810 bases on C-SKY V2 instruction set architecture and 16/32-bit
>>> variable length instruction. Including basic core(CK807/CK810),
>>> floating-point enhancement(CK807F/CK810F), multimedia enhancement (CK810D)
>>> and multiple-processing extension (CK807MP/CK810MP).
>>
>> Which ABIs of those do you intend to support?
>>
>> These should be added to the README file.
> 
> Thanks for comment.
> In glibc and linux we only cares about following cpu and extensions.
> 
>      ck610 only  have: ck610
>      ck807 could have: ck807 ck807f ck807vf ck807ef
>      ck810 could have: ck810 ck810f ck810vf ck810ef
>      ck860 could have: ck860 ck860f ck860vf
>    f: means FPU co-processor
>    v: means VDSP co-processor just like "ARM-NEON"
>    e: is our old DSP co-processor which use HI-LO regs for operation. In
>    current ck807/ck810 they default have HI-LO regs.
>   
> For this patch-set, we support:
>     ck610
>    (ck807/ck807f/ck807ef)
>    (ck810/ck810e/ck810ef)
> 
> ck6** use csky-*-linux-gnuabiv1, ck8** use csky-*-linux-gnuabiv2
> I will update the introduction for these.
>   
> It seems only this need be added to the README file. Is that correct?
>          csky-*-linux-gnuabi

It's still not clear to me whether you intend to support more than one 
ABI (there is a __CSKYABIV2__ preprocessor conditional in the 
submission, for example).

If you support multiple ABIs, won't you need different target triplets?

Thanks,
Florian