[Bug 51596] Unhandled exception code c0000005 when running any 64-bit Winelib application

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51596

Bernhard Übelacker <bernhardu at mailbox.org> changed:

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                 CC|                            |bernhardu at mailbox.org

--- Comment #2 from Bernhard Übelacker <bernhardu at mailbox.org> ---
Created attachment 70490
  --> https://bugs.winehq.org/attachment.cgi?id=70490
Details on the debugging attempt.

I tried to debug this and think I found some details.

In function "init_builtin_dll" an array with init functions is
queried and called afterwards.

Unfortunately the base address of this array is stored in register $rsi,
which gets overwritten in the call to
the function frame_dummy/register_tm_clones (main.exe).


I tried adding a "volatile" to the variable funcs declaration,
and with that the executable did output its message without crash.

-    void (**funcs)(int, char **, char **) = (void *)buffer;
+    void (** volatile funcs)(int, char **, char **) = (void *)buffer;


Unfortunately I can't tell if $rsi is allowed to be overwritten at
that point and wineg++ has to be modified to avoid this,
or if the "volatile" approach is right (and reliable).

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