[Xen-devel] Hypercalls: ignored output registers?

[Carl Patenaude Poulin <carl.patenaudepoulin@xxxxxxxxxxxxxx>]

Hi all,

I'm looking at how hypercalls are implemented in Mini-OS and Andrew

Cooper's xen-test-framework. In both cases, several registers are

defined as outputs, they're bound by input registers, and their

outputs are ignored. Is there any reason for doing this instead of

just declaring directly the input registers?

Is it because the registers are callee-saved? If that's the case,

why not just put them in the clobber list?

Best

Carl Patenaude Poulin

McGill University

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