Re: problem with fetch_link_map_offsets

["Kris Warkentin" <kewarken at qnx dot com>]

> > > Yeah but....a QNX binary is just an ordinary elf binary.  There are no
> > > special sections or magic in there for the sniffer to catch.  Hence my
> > > problem.  Perhaps it should be returning unknown so that another
sniffer
> > > (like my one liner) could get it?
> > >
> >
> > NetBSD binaries look like ordinary ELF too, as do Linux.  The only way
to
> > resolve this is to arange for the crt0.o file to contain some magic that
> > GDB can find.  Normally this is a special .note section.
> >
> > Can you not arrange for QNX binaries to have such a note and then add
> that.
>
> Perhaps.  I'll have to talk to some of the folk here.  I think it would be
> really handy to be able to recognize one of our binaries.  Thanks for the
> suggestion.

Here's a fix that works right now:  If I put the code below into
generic_elf_osabi_sniff_abi_tag_sections(), the sniffer does its job.  The
problem with this is that it will only work on dynamically linked binaries.
Convenient as a stop-gap and for a certain amount of backwards
compatability.  I think the .note.qnxnto.ident section is still a good idea
though.  I tried putting one into our crtbegin.o but then programs were core
dumping so I'm doing something wrong there.  I'll have to talk to the OS
folks.

cheers,

Kris

  /* QNX Neutrino has ldqnx.so as its linker.  */
  if (strcmp (name, ".interp") == 0 && sectsize > 0)
    {
      char *buf = alloca(sectsize);
      bfd_get_section_contents(abfd, sect, buf, 0, sectsize);
      buf[sectsize] = '\0'; /* Safety first boys and girls.  */
      if(strstr(buf, "ldqnx.so"))
        *os_ident_ptr = GDB_OSABI_QNXNTO;
      return;
    }