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Re: [patch] Dynamic Loader Bugs

From: Timothy Baldwin
Subject: Re: [patch] Dynamic Loader Bugs
Date: Mon, 18 Oct 2004 00:11:31 +0100
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On Friday 15 Oct 2004 01:07, Tomas Ebenlendr wrote:
> This patch is nice, after aplying this patch, and fixing the
> mregparm=3 stuff, grub-emu can be changed to load the modules dynamically,
> instead of statically linking.
> I have just few questions, because I want to know how it works.
> > 1. Gcc 3.4 will delete the module initialization and finalisation
> > functions as they appear to be unused.
> It is deleted before objcopy -K ... aplies ? Or -K is just ignored?

Yes, it is not included in the assembler output of gcc 3.4.

> > 3. The modules contain common symbols, which the dynamic loader can't
> > handle.
> Yes I saw one variable somwhere in normal.mod that was not
> preinitialized, and so gcc assumes, that dynamic loader will aloccate
> appropriate space.(And it doesn't.) Is this what you mean?


> > 4. The dynamic loader uses the size of common symbols as their address,
> > instead of returning an error.

Sorry, it uses the alignment of the sysmbol.

> If I understand it well, it thinks that the symbol lives at address 0x4.

Or whatever the alignment is.

Member AFFS, WYLUG, SWP (UK), ANL, RESPECT, Leeds SA, Leeds Anti-war coalition
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