[Bug dynamic-link/15971] No interface for debugger access to libraries loaded with dlmopen

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

https://sourceware.org/bugzilla/show_bug.cgi?id=15971

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a93d9e03a31ec14405cb3a09aa95413b67067380

commit a93d9e03a31ec14405cb3a09aa95413b67067380
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Aug 17 19:35:48 2021 -0700

    Extend struct r_debug to support multiple namespaces [BZ #15971]

    Glibc does not provide an interface for debugger to access libraries
    loaded in multiple namespaces via dlmopen.

    The current rtld-debugger interface is described in the file:

    elf/rtld-debugger-interface.txt

    under the "Standard debugger interface" heading.  This interface only
    provides access to the first link-map (LM_ID_BASE).

    1. Bump r_version to 2 when multiple namespaces are used.  This triggers
    the GDB bug:

    https://sourceware.org/bugzilla/show_bug.cgi?id=28236

    2. Add struct r_debug_extended to extend struct r_debug into a linked-list,
    where each element correlates to an unique namespace.
    3. Initialize the r_debug_extended structure.  Bump r_version to 2 for
    the new namespace and add the new namespace to the namespace linked list.
    4. Add _dl_debug_update to return the address of struct r_debug' of a
    namespace.
    5. Add a hidden symbol, _r_debug_extended, for struct r_debug_extended.
    6. Provide the symbol, _r_debug, with size of struct r_debug, as an alias
    of _r_debug_extended, for programs which reference _r_debug.

    This fixes BZ #15971.

    Reviewed-by: Florian Weimer <fweimer@redhat.com>

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