On 12/22/2017 12:07 AM, Sebastian Huber wrote:
On 22/12/17 00:18, Chris Johns wrote:
On 22/12/2017 09:47, Till Straumann wrote:
On 12/21/2017 04:36 PM, Chris Johns wrote:
On 22/12/2017 08:34, Joel Sherrill wrote:
On Dec 21, 2017 3:04 PM, "Till Straumann" <strau...@slac.stanford.edu
<mailto:strau...@slac.stanford.edu>> wrote:
On 12/20/2017 02:46 PM, Chris Johns wrote:
On 21/12/17 2:22 am, Till Straumann wrote:
I think it would not be very difficult to add
support for dlopen to
cexpsh.
Great. Is there a public repo with the latest code?
https://github.com/till-s/cexpsh
<https://github.com/till-s/cexpsh>
Thanks.
Can just the cexp part be brought into RTEMS under say
libmisc?
In principle, yes, but I'd think it might be more useful if
we add
support for loading modules via dlopen (under linux this
already works
but I'd expect RTEMS' variant to differ; in particular I'm
using dlinfo
and dl_iterate_phdr, i.e., some sort of inspection is
required).
We do not support dl_iterate_phdr and I am not sure what is present
in dlinfo.
dl_iterate_phdr is necessary to support the following:
I see it is in Linux and FreeBSD and not the standard, this is why it
was missed:
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/dlfcn.h.html
I do not keep the ELF headers or any ELF detail about and this call
is awkward
because RTEMS supports more than ELF as a format. Further to this
Linux and
FreeBSD provide different structs so what is considered portable?
If we can find a suitable struct for this call then adding it should
not be
difficult if the locking can be sorted, ie holding the RTL lock while
in the
call back. Keeping ELF data on RTEMS just in case this call is made
is an
overhead I do not like as it does not fit our embedded systems approach.
At least at the moment all RTEMS targets use ELF. I removed all
non-ELF support in Binutils for obsolete RTEMS targets in January 2017.
Good news.
It would be nice to have the ELF headers in RTEMS (or Newlib) also for
simple bootloaders.
FWIW - I had (a while ago) created the pmelf library (which is
distributed with cexpsh but can be unbundled).
The primary goals were:
- independent licensing
- only read pieces of a file which are actually needed. Most ELF
libraries I know start with reading
the full file into memory and then go to town. pmelf tries to avoid
that.
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