[BULK] RFC: Generic shadow mechanism useable from a payload
Eric W. Biederman
ebiederman at lnxi.com
Sat Jan 29 13:05:01 CET 2005
Richard Smith <smithbone at gmail.com> writes:
> > Yes you can do that with ELF.
> > The big gotcha is going to be that there are pirq tables current
> > stored at 0xf0000 that you are not going to want to stomp.
> Actually thats not that much of an issue. It currently stomps it already
> ADLO has that table broken out into a single binary file. All I do is
> copy the table binary table generated with linubios into the adlo
> build file and it gets stuck in the adlo image. Loader.s copies it
> to a specific location.
> So really if you loaded loader and ADLO code after the linuxbios PIRQ
> table location and then tweaked loader to not make a PIRQ it should be
> Not haveing to do the PIRQ table copy would be nice but its pretty
> trival. A script to do it automatically would be easy.
The fact that ADLO has to manually customized per board is what
keeps it from being a lot more generally usable.
> > The fun question. Can I make the bochs bios useable on a system
> > after the linux kernel has run. Load it with kexec and then boot windows?
> > If LinuxBIOS is the native bios this should be no extra challenge. If the
> > native BIOS is something else life gets a little more interesting.
> That _is_ a fun quesition.. I don't think you would have too many
> problems though. The ADLO bios is used to running on systems that
> already have everything setup. It does minimal hardware setup. If
> you put everything in the right spot and modified the loader so that
> it didn't copy anything I think it will work.
> kexec loads an elf right? So this would be pretty easy to test.
Yes /sbin/kkexec loads an elf among other things.
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