Re: [Qemu-devel] How to make ELF headers/symbol sections available for multiboot?

[Eduardo Habkost <ehabkost@redhat.com>]

CCing Alex, the original author of load_multiboot(), and Kevin,
who touched multiboot code recently.


On Fri, Jul 28, 2017 at 02:28:34PM -0700, Anatol Pomozov wrote:
> Hi
> 
> I am looking at x86 multiboot code and trying to add "ELF section
> header" info feature. This will let target to learn more about booted
> binary and its sections.

Are there existing OSes that use that information?


> 
> I have a draft here
> https://github.com/anatol/qemu/commit/ad943a6eb78feee048b6bb2a1e5f49f5b686e24c
> 
> My understanding is that qemu multiboot loads only TEXT/BSS/DATA
> sections. Other stuff like symbols sections and ELF headers are not
> available for target.
> 
> So I need to perform 2 things:
> 
>  - Load ELF section headers into target's memory. I did by appending
> additional space to mbs.mb_buf and copying header data. Is it the best
> way to do?
> 
>  - Next I need to load other ELF sections such as symbols (e.g.
> .shstrtab) that store section names. What is the best way to do in
> multiboo.c code? Would it make sense to load all ELF sections?
> 
> Thanks in advance.
> 

-- 
Eduardo