[Xen-devel] Re: [patch 1/5] add libelf: an ELF binary parser library.

[Emmanuel Ackaouy <ack@xxxxxxxxxxxxx>]

Hi Gerd,

I have to say I'm not a big fan of sticking a 32bit and 64bit version
of each structure in a union and then checking at all levels of the
function call stack which one to reference (via elf_xval() for example).

Wouldn't it be cleaner to just have 2 different version of each elf
data structure and function? elf32_xxx and elf64_xxx . And go down
one path or the other at the start of your function call stack? I'm not
usually a fan of multiple compilation, but due to the layout of 32
and 64bit elf structures, this is one case where it makes sense
to me.

Also, do we actually have a need to look at elf files with a different
ELFDATA (byte ordering) ?


On Jan 23, 2007, at 15:53, Gerd Hoffmann wrote:

> This patch adds a library with a small collection of helper functions
> to parse and load elf binaries.  The library handles endianess and
> elfsize at runtime.
>
> The patch also shuffles around the include files a bit.  Now there is
> *one* include file holding all the elf structures
> (xen/include/public/elfstructs.h) which is included by everyone who
> needs them.
>
> It's dead code with this patch only, putting the code into use happens
> in followup patches.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxx>
> ---
>  tools/libxc/xc_elf.h                |  525 
> -----------------------------------
>  xen/arch/x86/boot/mkelf32.c         |    2
>  xen/common/Makefile                 |    2
>  xen/common/libelf/Makefile          |    4
>  xen/common/libelf/README            |    1
>  xen/common/libelf/libelf-dominfo.c  |  420 
> ++++++++++++++++++++++++++++
>  xen/common/libelf/libelf-loader.c   |  156 ++++++++++
>  xen/common/libelf/libelf-private.h  |   51 +++
>  xen/common/libelf/libelf-relocate.c |  345 +++++++++++++++++++++++
>  xen/common/libelf/libelf-tools.c    |  225 +++++++++++++++
>  xen/include/public/elfstructs.h     |  527 
> ++++++++++++++++++++++++++++++++++++
>  xen/include/public/libelf.h         |  238 ++++++++++++++++
>  xen/include/xen/elf.h               |  490 
> ---------------------------------
>  13 files changed, 1972 insertions(+), 1014 deletions(-)
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