Re: 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



To: "Michael Matz" <m...@suse.de>
Cc: <gcc-patches@gcc.gnu.org>; "Leif Ekblad" <l...@rdos.net>
Sent: Tuesday, May 14, 2013 11:35 AM
Subject: Re: Using GS for TLS on x86-64 for target RDOS

----- Original Message ----- From: "Uros Bizjak" <ubiz...@gmail.com>

On Tue, May 14, 2013 at 11:13 AM, Michael Matz <m...@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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