Re: [Xen-devel] Xen hypercall calling convention

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 04/12/15 03:21, Carl Patenaude Poulin wrote:

Hi folks,

On page 12 of "The Definitive Guide to the Xen Hypervisor", it is mentioned that "Xen, like Linux, uses the MS-DOS calling convention, rather than the UNIX convention used by FreeBSD."

I keep digging online and I can't find any information about an "MS-DOS calling convention".

Second google link,

www.agner.org/optimize/calling_conventions.pdf

except that you want to be looking for Windows 16bit as its alternative name.

We've already reverse engineered which registers are used in what order from the Mini-OS source code, but I'm wondering if there's a specification of this calling convention floating anywhere.

The in-tree public header files are the authoritative source of information, so

http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=xen/include/public/arch-x86/xen-x86_32.h;hb=HEAD

and

http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=xen/include/public/arch-x86/xen-x86_64.h;hb=HEAD

respectively.

~Andrew

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