Re: [PATCH v4] gdb, gdbserver: support dlmopen()

[Tom Tromey <tom@tromey.com>]

>>>>> "Markus" == Markus Metzger via Gdb-patches <gdb-patches@sourceware.org> writes:

Markus> This patch was originally developed by H.J.  Last version:
Markus> https://sourceware.org/pipermail/gdb-patches/2021-October/182353.html

Hi.  Thanks to you and HJ for doing this -- dlmopen has long been a hole
in gdb.

Markus> +  /* There may be different instances of the same library, in different
Markus> +     namespaces.  Each instance, however, must have been loaded at a
Markus> +     different address so its relocation offset would be different.  */
Markus> +  const lm_info_svr4 *lmg = (const lm_info_svr4 *) gdb->lm_info;
Markus> +  const lm_info_svr4 *lmi = (const lm_info_svr4 *) inferior->lm_info;
Markus> +
Markus> +  return (lmg->l_addr_inferior == lmi->l_addr_inferior);

Can you explain how objfile handling works?

I'd suspect that just a single objfile will be made for a given .so.
But, if that comment is correct (I think it is) then that would be
wrong, because an objfile has to know the correct runtime offset.

Maybe I'm mistaken about how the objfiles are created.
That would be good...

thanks,
Tom