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Re: [Xen-devel] porting xen-detect ASM code into a shared library
| To: | Guillaume Rousse <Guillaume.Rousse@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] porting xen-detect ASM code into a shared library |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 10 Jul 2008 10:28:50 +0100 |
| Cc: | |
| Delivery-date: | Thu, 10 Jul 2008 02:29:16 -0700 |
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| Thread-topic: | [Xen-devel] porting xen-detect ASM code into a shared library |
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On 10/7/08 10:21, "Guillaume Rousse" <Guillaume.Rousse@xxxxxxxx> wrote: > I'm trying to port xen-detect.c ASM code into cfengine, which is > currently build as a shared library. However, I'm facing a compilation > error: > misc.c: In function 'Xen_cpuid': > misc.c:1376: error: can't find a register in class 'BREG' while > reloading 'asm' > misc.c:1376: error: 'asm' operand has impossible constraints > > From See tools/libxc/xc_cpuid_x86.c for an example of how to work around this. Essentially you turn the "=b" constraint into "=r". You then push/pop ebx (to save/restore it) and you 'mov %%ebx,%1' to save away ebx's value before restoring its original value. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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