Partial backport of the scripts/glibcelf.py part of:

commit 4610b24f5e4e6d2c4b769594efa6d460943163bb

Author: H.J. Lu <hjl.tools@gmail.com>

Date:   Tue Mar 29 14:08:54 2022 -0700

    elf: Define DT_RELR related macros and types

diff --git a/scripts/glibcelf.py b/scripts/glibcelf.py

index da0d5380f33a195e..f847b36c55c15b8a 100644

--- a/scripts/glibcelf.py

+++ b/scripts/glibcelf.py

@@ -304,6 +304,7 @@ class Sht(_OpenIntEnum):

     SHT_PREINIT_ARRAY = 16

     SHT_GROUP = 17

     SHT_SYMTAB_SHNDX = 18

+    SHT_RELR = 19

     SHT_GNU_ATTRIBUTES = 0x6ffffff5

     SHT_GNU_HASH = 0x6ffffff6

     SHT_GNU_LIBLIST = 0x6ffffff7

@@ -593,6 +594,9 @@ class Dt(_OpenIntEnum):

     DT_PREINIT_ARRAY = 32

     DT_PREINIT_ARRAYSZ = 33

     DT_SYMTAB_SHNDX = 34

+    DT_RELRSZ = 35

+    DT_RELR = 36

+    DT_RELRENT = 37

     DT_GNU_PRELINKED = 0x6ffffdf5

     DT_GNU_CONFLICTSZ = 0x6ffffdf6

     DT_GNU_LIBLISTSZ = 0x6ffffdf7