Using GS for TLS on x86-64 for target RDOS

[Leif Ekblad]

I've made a patch along these lines  (enclosed).

Change log:
* gcc/config/i386/i386.c: Use DEFAULT_TLS_SEG_REG to access TLS
* gcc/config/i386/i386.h: Define default segment register for TLS
* gcc/config/i386/rdos.h: Added TLS configuration for RDOS

Regards,
Leif Ekblad


----- Original Message ----- 
From: "Uros Bizjak" <ubizjak@gmail.com>
To: "Michael Matz" <matz@suse.de>
Cc: <gcc-patches@gcc.gnu.org>; "Leif Ekblad" <leif@rdos.net>
Sent: Tuesday, May 14, 2013 11:35 AM
Subject: Re: Using GS for TLS on x86-64 for target RDOS


> On Tue, May 14, 2013 at 11:13 AM, Michael Matz <matz@suse.de> wrote:
> 
>> On Tue, 14 May 2013, Uros Bizjak wrote:
>>
>>> I'd propose to introduce:
>>>
>>> a) #define DEFAULT_TLS_SEG_REG in i386.h to SEG_GS
>>>
>>> b) #undef and #define DEFAULT_TLS_SEG_REG in x86-64.h to SEG_FS
>>
>> This would break -m32.
> 
> Uh, yes.
> 
> So instead of a) and b), there should be:
> 
> #define DEFAULT_TLS_SEG_REG TARGET_64BIT ? SEG_FS : SEG_GS in i386.h.
> 
> Uros.
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