> I just tested iret after syscall on my K6-2, and it does work. It
> looks like the old version of SYSCALL isn't worth supporting then, as
> it has other problems with the return to user mode as well. I'm
> working on an equivalent of your SYSENTER patch. One concern I have
> however is that currently entry.S is a mess of spaghetti code (for
> good reason unfortunately), and all these alternate syscall entries
> are making it much worse.
i suspect the AMD SYSCALL/SYSLEAVE instructions were changed to be
completely compatible with Intel's SYSENTER/SYSEXIT instructions? In that
case the only thing to do is to initialize the STAR MSRs in the
init_fastcall() function in my patch in the AMD case. The rest can be
shared.
-- mingo
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