Re: System.map
Just a thought - when I compile and installed my own kernel, I used the
zImage kernel. I played with make-kpkg, and this wants to put the
files vmlinuz & vmlinux in /boot. Would using zImage instead of
vmlinux cause problems? How do I produce vmlinux from the kernel source?
BTW, I can't see any install options in the kernel makefile. I just
followed the instructions in the readme, which were to:
make config
make clean; make dep
make zImage
make modules
make modules-install
cp arch/i386/boot/zImage /boot
modify lilo to include /boot/zImage
The README doesn't mention anything about System.map :(
Thanks for any information,
Chris
On Sun, 24 May 1998, Bill Mitchell wrote:
> Off the top of my head ---
>
> That file gives the memory addresses of symbolic variables used in
> the kernel. The memory contents of the kernel data in these variables
> can then be found by looking at the appropriate offset in /dev/kmem.
> It's messy, but it's effective.
>
> The lsof program needs to peek at internal kernel data in this way to
> find the info on what files are open.
>
> I believe that the System.map file gets put in place properly if
> you use the kernel makefile to install the kernel you've built.
> I don't have a machine with a kernel source tree handy to check how
> to do that, but it should not be too hard to figure out by looking
> at the docs in the source tree or reading the makefiles. Perhaps
> it's as simple as typing make install, or make Zinstall, or somesuch.
>
> Also, there is a debian package named kernel-package which provides
> a means to build .deb format binary kernel packages for you from the
> source tree you have installed. You can then use dpkg to install the
> kernel, and put the System.map file in place that way. I participated in
> a debian-devel discussion about the internals of this six or eight months
> ago, and that discussion produced plans to enhance the kernel-package
> package so as to support installing multiple alternative kernels of the
> same kernel version (something it could not handle at that time). I am
> just getting back into debian after a long absence from the project, and
> I'm not sure of the current status of kernel-package (or, for that
> matter, of quite a few other things).
>
> Hope that helps.
>
> On Sun, 24 May 1998, Chris wrote:
>
> >
> >
> > Hi,
> >
> > I was wondering if somebody could give me an idea of what the System.map
> > file is for? I've allways compiled my own kernels, and never had to worry
> > about this file (never had any problems). However I tried to use the
> > command lsof, and it complains that it can't find a System.map file to
> > match my currently booted kernel.
> >
> > What does this mean - and how can it be rectified? I've looked through
> > the docs and it doesn't appear to be mentioned.
> >
> > Thanks,
> >
> > Chris
> >
> >
> > --
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