RE: [Xen-devel] PIC register 'bx' clobbered in 'asm' -xen-unstable build error

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> The big question is why are you clobbering bx , dx registers on get
> cpuid:

cpuid stores its output in eax,ebx,ecx,edx.

Ian

>       _asm__ __volatile__ ("cpuid"
>                           : "=a" (eax), "=c" (ecx)
>                           : "0" (1)
>                           : "bx", "dx");
> 
> You can change this to:
>       
>               _asm__ __volatile__ ("cpuid"
>                           : "=a" (eax), "=c" (ecx)
>                           : "0" (1)
>                         );
> 
> But I am not sure why this is there?
> 
> 
>       
> On Fri, 2005-02-25 at 15:02 -0600, David F Barrera wrote:
> > I am trying to build xen-unstable on an x86 box, but it is 
> failing with 
> > the following message:
> > 
> > gcc  -DPIC -m32 -march=i686 -Wall -Werror -O3 
> -fno-strict-aliasing -I 
> > ../../tools/libxutil -I. -Wp,-MD,.xc_rrobin.opic.d -fPIC -c -o 
> > xc_rrobin.opic xc_rrobin.c
> > gcc  -DPIC -m32 -march=i686 -Wall -Werror -O3 
> -fno-strict-aliasing -I 
> > ../../tools/libxutil -I. -Wp,-MD,.xc_vmx_build.opic.d -fPIC -c -o 
> > xc_vmx_build.opic xc_vmx_build.c
> > xc_vmx_build.c: In function `vmx_identify':
> > xc_vmx_build.c:468: error: PIC register `bx' clobbered in `asm'
> > make[4]: *** [xc_vmx_build.opic] Error 1
> > make[4]: Leaving directory `/tmp/xen-unstable/tools/libxc'
> > make[3]: *** [all] Error 2
> > make[3]: Leaving directory `/tmp/xen-unstable/tools/libxc'
> > make[2]: *** [install] Error 2
> > make[2]: Leaving directory `/tmp/xen-unstable/tools'
> > make[1]: *** [tools] Error 2
> > make[1]: Leaving directory `/tmp/xen-unstable'
> > make: *** [world] Error 2
> > make world failed
> > 
> > I have built xen-unstable on this machine before, so I 
> don't believe it 
> > is a setup problem.  Has anyone else observed this?
> > 
> > David F Barrera
> > 
> > 
> > 
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> -- 
> Jerone Young
> Open Virtualization
> IBM Linux Technology Center
> jyoung5@xxxxxxxxxx
> 512-838-1157 (T/L: 678-1157)
> 
> 
> 
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