Re: ld-Script needed OR (predicted) Architecture of Kernel 3.0 ;-)

[Hartmut Zybell]

 --- "Richard B. Johnson" <root@xxxxxxxxxxxxxxxxxx>
schrieb: > On Tue, 14 Oct 2003, [iso-8859-1] Hartmut
Zybell
> wrote:
> 
> > First things first: Please CC me, because I'm not
> > subscribed.
> >
> > I need a ld-Script to construct an elf-File that
> is a
> > tar-File too. Can
> > anyone help me? Especially the Checksum is tricky.
> >
> [SNIPPED....]
> 
> I don't think you are aware that the kernel is
> compressed,
> then expanded when installed. It therefore has all
> the good
> attributes of a `tar.gz` file without any of the bad
> ones.
> 
Of course I'm aware. But what bad ones do you mean?
> Also, we have a module loader and unloader that
> allows modules
> to be inserted and removed from a running system.
Can you remove modules from a running system, that
are compiled into the kernel? For instance the
Filesystem driver, that were used to boot and is
not longer needed because / has another filesystem
than
/initrd.
> There are
> even experimental systems that allow the whole
> kernel to be
> changed without (apparent) re-booting.
> 
> A file with a 'tar' header is useful for recovering
> a
> directory tree, intact, as it was initially
> backed-up.
> It has no usefulness in the kernel where the content
> of a file (or files) are located into various
> offsets
> in RAM. This is done by the linker and 'helper code'
> within the kernel itself.
I seem to have misread here. I *don't* want to change
the kernel with tar, as you seem to assume. Thats why
I'm asking for an ld-script. I want to be able to
*extract* (READ-ONLY) modules from a kernelfile that
are compiled into this (not currently running) kernel
to insert them into the currently running kernel to
update it. And I want to do it *with* the current
module loader.
> 
> You can readily run an install-system without any
> runtime libraries and/or you can use temporary ones.
> This is currently done for every major distribution.
> 
Of course it's done. You have 2 files: one staticaly
linked to run at install time, one binary archive
(descendent of tar) to install into the system.
If I could make the binary do double duty as install
archive, I could save 50% space. Thats a lot on a
floppy based install. And make no mistake: Even CDROM
(not all, I know!) boot from a floppy image.
> The runtime libraries are not used by the kernel.
> Instead they are used by user-mode code.
> 
I *wrote* that the first example has nothing to do
with
the kernel. It's only there because it's simpler.
And useful too.


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