[Bug gdb/11839] gdb does not detect calls to dlmopen

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=11839

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Markus Metzger <mmetzger@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=8d56636a0ecbe6c38bf52b0683326ee21693c548

commit 8d56636a0ecbe6c38bf52b0683326ee21693c548
Author: Markus Metzger <markus.t.metzger@intel.com>
Date:   Mon Oct 4 10:24:35 2021 +0200

    gdb, gdbserver: support dlmopen()

    In glibc, the r_debug structure contains (amongst others) the following
    fields:

      int r_version:
        Version number for this protocol.  It should be greater than 0.

    If r_version is 2, struct r_debug is extended to struct r_debug_extended
    with one additional field:

      struct r_debug_extended *r_next;
        Link to the next r_debug_extended structure.  Each r_debug_extended
        structure represents a different namespace.  The first r_debug_extended
        structure is for the default namespace.

    1. Change solib_svr4_r_map argument to take the debug base.
    2. Add solib_svr4_r_next to find the link map in the next namespace from
    the r_next field.
    3. Update svr4_current_sos_direct to get the link map in the next namespace
    from the r_next field.
    4. Don't check shared libraries in other namespaces when updating shared
    libraries in a new namespace.
    5. Update svr4_same to check the load offset in addition to the name
    6. Update svr4_default_sos to also set l_addr_inferior
    7. Change the flat solib_list into a per-namespace list using the
    namespace's r_debug address to identify the namespace.

    Add gdb.base/dlmopen.exp to test this.

    To remain backwards compatible with older gdbserver, we reserve the
    namespace zero for a flat list of solibs from all namespaces.  Subsequent
    patches will extend RSP to allow listing libraries grouped by namespace.

    This fixes PR 11839.

    Co-authored-by: Lu, Hongjiu  <hongjiu.lu@intel.com>

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