Re: Appending program headers to existing ELFs?

[Fangrui Song <i@maskray.me>]

I think "error: could not allocate headers" means that you need to set
the location counter to an appropriate address.
In the internal linker script, it's something like   . =
SEGMENT_START("text-segment", 0) + SIZEOF_HEADERS;

For your original feature request, I wonder whether it should be the
responsibility of the post-link tool.
For example, patchelf supports adding a new program header. This is
done by appending the program headers to the end of the object file,
then changing e_phoff in the ELF header.
The original program headers immediately after the ELF header (added
by the linker) are then unused, but that is a small amount of waste.

On Thu, Nov 16, 2023 at 12:51 AM Nick Clifton <nickc@redhat.com> wrote:
>
> Hi Matheus,
>
> > In concrete terms:
> >
> > I'm building a small programming language interpreter
> > and would like to add support for embedding programs
> > into the executable. My intention is to treat the
> > embedded programs section as an additional load path
> > for libraries and modules as well as the main function.
>
> Couldn't your interpreter be a library (shared or static)
> and then all that a programmer would need to do is to
> include your library along with their code when they perform
> a link of their own ?
>
> Cheers
>    Nick
>
>