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Re: [Qemu-devel] How to make ELF headers/symbol sections available for m
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] How to make ELF headers/symbol sections available for multiboot? |
Date: |
Sun, 30 Jul 2017 18:42:31 -0300 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
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