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

[Jerone Young <jyoung5@xxxxxxxxxx>]

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

        _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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