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From: marcov@stack.nl (Marco van de Voort)
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Subject: ABI Compliance FreeBSD syscalls
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Are FreeBSD syscalls (on x86) x86 ABI compliant? IOW do they save the
required registers (IIRC ebx,esi,edi) ?

I tried to derive it from the sources, but my gcc pragmaese is not on a
high enough level for that.