How to fix SizeOfImage when loading a builtin dll ?

Laurent Pinchart laurent.pinchart at
Wed May 29 16:22:00 CDT 2002

On Wednesday 29 May 2002 22:40, Eric Pouech wrote:
> > I thought about modifying winebuild to add
> >
> > char _end[];
> > nt_headers->OptionalHeader.SizeOfImage = pe_header - _end;
> >
> > in the library initialisation function. This is small, fast and probably
> > more accurate.
> >
> > Does anyone have any comment about that ?
> don't you mean extern char _end[] instead ?

Yes, sorry.

> there's nothing currently which ensures that pe_header is at the start
> of the code (it relies on the fact it's the first on gcc/ld link option,
> and that ld allocates slots for compilation units in the order they are
> expressed) => this may become a porting issue
> I'm not sure either that _end is completly portable?

I don't know either. We could instead add a linker script which would set a 
symbol to the difference between the end and the start of the file. That 
should be more portable.

> using this technique (with _start, _etext, _edata, _bss_start, _end) we
> could also compute the "real" size of code, data, and bss which should
> be of some interest (even if data would be a bit more difficult, since
> we need to take care of the rsrc part)

One thing at a time please :-)

I tried the code described above, but it unfortunately doesn't work for all 
dlls. It returns a correct value in some cases (for small dlls it seems), and 
a huge negative value around 0xc0000000 in other cases (for bigger dlls).

I check the pe_header and _end symbols using nm and they are correct 

I then checked the assembly code generated by gcc, and found out that _end - 
pe_header is computed by reading 2 valus in the .got section and substracting 

Could anyone help me ?

Should I try with a linker script ?

Laurent Pinchart

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