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Index > High Level Languages > Dynamic stack size

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Posetf



Joined: 01 Mar 2004
Posts: 35
Location: London
Posetf
Does anyone know how to dynamically extend the system stack?
fasm defaults to 64K, and I know about the stack directive, but I am thinking dynamically. I have managed to catch some page guard exception or other, but have no idea what I could do next. All I can find on google are a couple of hints that it is possible, but no examples.
Post 02 Nov 2005, 12:15
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
maybe alocate bigger chunk of memory, copy wntire stack there and set (somehow) SS:ESP to point there?
Post 02 Nov 2005, 13:00
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farrier



Joined: 26 Aug 2004
Posts: 274
Location: North Central Mississippi
farrier
Posetf,

You don't say what environment you are programming to: Windows, DOS, Linux, ...

If Windows, is the problem when you are using a lot of local variables? If so, you can protect against gaurd page exceptions by using the following:
Code:
        mov     eax, ebp
        sub     eax, 4096
        .while eax, a, esp
                mov     dword [eax], 0
                sub     eax, 4096
        .endw

    

immediately after the declaration of your locals and before any code which might use the stack variables.

This will touch, if necessary, every page of the stack that your locals will use. As each 4096 byte page is touched, it sets up the following 4096 byte page as the next guard page, and will prevent exceptions for this reason.

hth,

farrier

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Post 02 Nov 2005, 14:23
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