[Bug 32515] Steam games protected with Valve's CEG ( Custom Executable Generation) DRM scheme fail game cache validation

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=32515

--- Comment #84 from Christian Inci <chris.wine at broke-the-inter.net> ---

What the heck? I'm not that sure anymore.
Where did the comment about the debug registers came from? Did they tested it
too? I only sent my test results to Julliard, which were the same (except with
2.6.28). (I've tested it with Linux 2.6.28, 4.10.x, MacOS 10.10, 10.12, FreeBSD
11)

Julliard wrote to me, that the set_thread_context call will slow down thread
creation. I guess that it's preferred to fix it at the kernel instead of
calling that function everytime and the cached values shouldn't be inherited if
the actual values won't be either.
Calling this function isn't required for this specific bug, as Valve's CEG will
only check the cached debug registers instead of the actual values/registers
for some reason, but it's there for consistency. I don't know if it's the
correct behaviour to clear the debug registers or if it's even specified to do
it, but only Microsoft and Apple are doing it (maybe even correctly) and I hate
them for that.

Anyway, many thanks to the staging team for merging, cleaning and fixing up my
patches.

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