[Bug 47125] Preloader fails to reserve a memory range when running under valgrind

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=47125

--- Comment #3 from Austin English <austinenglish at gmail.com> ---
(In reply to jeffersoncarpenter2 from comment #2)
> (In reply to Austin English from comment #1)
> > Does it actually cause a problem? I'm fairly certain that's expected
> > behavior.
> 
> Expected behavior for what reason?  I don't know if this is a problem
> (valgrind fails to recognize an instruction later and kills the program,
> then there's an invalid write reported from the SIGILL handler), but if it
> were expected and correct behavior, then why print a warning?

>From loader/preloader.c:
 * To do this, we implement our own shared object loader that reserves memory
 * that is important to Wine, and then loads the main binary and its ELF
 * interpreter.
 *                        
 * We will try to set up the stack and memory area so that the program that
 * loads after us (eg. the wine binary) never knows we were here, except that
 * areas of memory it needs are already magically reserved.                     
 *
 * The following memory areas are important to Wine:
 *  0x00000000 - 0x00110000  the DOS area
 *  0x80000000 - 0x81000000  the shared heap
 *  ???        - ???         the PE binary load address (usually starting at
0x00400000)

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