MapViewOfFile and VirtualQuery?

[Enigma]

I'm using FreePascal, it's compiler is not so smart as C++ compiler, so, FPC passed 5th parameters as dword and generated below asm:

mov rcx, qword prt [rsp + $44]
mov edx, 4
mov r8d, 0
mov r9d, 0
mov dword prt [rsp+$20], ebx
call MapViewOfFile

Kernel does not take this parameter as dword, it takes it as qword, so the data at [rsp+$24] was not empty and kernel thought that 5th parameter is not empty and so failed...

To solve - just change function declaration. Sorry, this is only FPC bug...

But VirtualQuery really works not same as in x86...

[gigaman]

What exactly are you passing into the VirtualQuery call? (all the arguments, I mean, maybe even with the corresponding disassembly)

[RaptorFactor]

I've had no problems using VirtualQuery in my x64 apps, and have not noticed the behavior you are describing (I am able to enumerate free memory blocks fine). I think that either your code is wrong, or your compiler is doing something wrong.

Would you mind posting the relevant snippets of your source code, along with a disassembly of the code generated by the compiler, so we can try and figure out what's going on?

As a reference, here's my memory region enumeration code which works for both native x86 and x64.
https://code.google.com/p/hadesmem/source/browse/trunk/Include/Memory/HadesMemory/Region.hpp
https://code.google.com/p/hadesmem/source/browse/trunk/Src/Memory/Memory/Region.cpp