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.
It would be nice to have the ELF headers in RTEMS (or Newlib) also for
simple bootloaders.
--
Sebastian Huber, embedded brains GmbH
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