[PATCH, i386] Remove EBX usage from asm code

[Uros Bizjak]

On Tue, Jan 20, 2015 at 10:42 AM, Rainer Orth
<ro@cebitec.uni-bielefeld.de> wrote:

>>> The target is i386-pc-solaris2.10, which includes i386/sysv4.h.  Only
>>> the amd64 crtbegin.o is affected, the i386 one is fine.
>>
>> Please split sysv4-common.h out of i386/sysv4.h, similar to how
>> i386/gnu-user.h and gnu-user-common.h are split.
>
> This would break Solaris/SPARC (there's no sparc/sysv4-common.h), and
> only works on Linux/x86 by accident:
>
> * CRT_GET_RFIB_DATA is only defined in i386/gnu-user.h there, but that
>   file is only included for 32-bit-only configurations, not
>   32-bit-default ones (--enable-targets=all).  In the latter case, the
>   macro is not defined for the 32-bit multilib, where it should be.
>
> * CRT_GET_RFIB_DATA is only used in libgcc/crtstuff.c and
>   libgcc/unwind-dw2-fde-dip.c (which already has a workaround for it
>   being incorrectly defined for 64-bit Solaris/x86).
>
> IMO, the definition has no business living in gcc/config/i386 at all,
> but should move to libgcc/config instead (together with the one in
> frv/frv.h).  That being probably too intrusive at this stage, I think
> the best workaround for now is to simply wrap the definition in
> i386/syv4.h (which is Solaris/x86-only anyway) in __i386__.

Ugh...

Considering your explanation and the mess in the unwinder, IMO this
should be fixed in the correct way even at this stage.

CC RMs for their opinion.

Thanks,
Uros.