[Bug 52483] New: League of Legends 9.10+ crashes after champion select (anticheat, 64-bit syscall executed in 32-bit process)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52483

            Bug ID: 52483
           Summary: League of Legends 9.10+ crashes after champion select
                    (anticheat, 64-bit syscall executed in 32-bit process)
           Product: Wine
           Version: 4.6
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs at winehq.org
          Reporter: z.figura12 at gmail.com
      Distribution: ---

Split from bug 47198.

League of Legends 9.10+ checks the value of the %cs register. If it is 0x23
exactly, which is the value of the 32-bit segment for 64-bit machines on both
Windows and Linux, it switches to 0x33 (the 64-bit segment on both operating
systems) and attempts to perform a syscall.

In order to support this (without changing the default %cs register), we will
need to support WoW64 emulation. Note that we actually also want to support
WoW64 emulation for other reasons, namely so that we can run on systems without
32-bit system libraries down to and including libc (cf. bug 45057).

As of the time of writing many parts of WoW64 emulation are already in place.
However, it is not enabled by default, because not all modules have been yet
split to support it, and even those that have do not currently all support
WoW64 thunking.

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