From:	groman AT f2s DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	Runtime entry point change... Possible?
Date:	Mon, 06 Nov 2000 20:27:31 GMT
Organization:	Deja.com - Before you buy.
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hello, I am using DJGPP to write a small exokernel
for i386(a hobby OS if you say). Well it's been
monolithic up to now, but now I want to make it exo(or micro).
I split it up in modules and managed to get GNU GRUB
to load them. I want to simplify intermodule communication
and execution, so I am wondering if there is a way
to declare procedure so that I can change it's physical
address entry point later at runtime. Is that possible.

e.g. two ELF binaries loaded in the same address space.

ELF1:

void FunctionPrint(void)
{
  DummyCode; // Never get's executed.
}

void main(void)
{
   // Begin pseudocode
   Assign(FunctionPrint, GetELF2FuncPrintEntry());

   FunctionPrint(); // Executes the function print from ELF2
   // End pseudocode
   // Is this possible with DJGPP? Assuming I have GetELF2FuncPrintEntry
}

ELF2:

void FunctionPrint(void)
{
    Print; // Get's executed from ELF1
}
/////

Is this possible? Or do I have to use inline assembly functions?(I
don't mind, just, it would make me look bad if it's possible with
DJGPP).

Thank you very much in advance.


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