christos@zoulas.com said:
> The vm.substr.vmsc.sc_* stuff refers to the old struct sigcontext. 

OK, I see. So it was not about signal handling, what I assumed.

> i386_vm86 needs to be versioned if that happens

FreeBSD seems to have made some efforts to keep mcontext
and sigcontext identical. Nor sure this is worth it, and
how this would interfere with SVR4 ABI compatibility.

best regards
Matthias