Re: How to load and execute COFF file

["Alexander Gdalevich" <gdalevich at hotmail dot com>]

> From: Toralf Lund <toralf@procaptura.com>
> To: Alexander Gdalevich <gdalevich@hotmail.com>
> CC: crossgcc@sources.redhat.com
> Subject: Re: How to load and execute COFF file
> Date: Mon, 15 Sep 2003 09:15:32 +0200
>
>
> > You will either need to write a custom loader (this is not too difficult, 
> > COFF is a pretty simple format), or have your code move itself to the 
> > proper place in memory.
>
> The plan is to write a loader, or rather, to modify an existing one. I'm 
> just wondering what it needs to do, apart from obvious stuff like actually 
> writing the data to memory.
I don't know exactly how your system works, but the loader just moves the 
program to the right place in memory and just jump to the entry point.

> > You may also compile with the "-oformat binary" option to generate binary 
> > image (that will still need to be moved to the right place in memory).
>
> Possibly a stupid question, but what would the right place in memory be?
That depends on how the memory is setup on your system.  You may compile 
with the "-Ttext PROG_START" option to tell the compiler (or rather the 
linker) where to place executable.  Here PROG_START would be address where 
you want the program placed.  For instance, "-Ttext 0x00400000" would build 
code to run from address 0x00400000.


> - Toralf

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