[Bug gold/20114] Partial relro support for s390x gold

[maamountk at hotmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20114

maamountki <maamountk at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #11439|0                           |1
        is obsolete|                            |

--- Comment #4 from maamountki <maamountk at hotmail dot com> ---
Created attachment 11705
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11705&action=edit
Partial relro support for gold

Now it is, As Andreas Krebbel did with ld, This patch separate .got and
.got.plt sections, swap them and assign the 3 magic GOT entries at the
beginning of .got section so _GLOBAL_OFFSET_TABLE_ will point to the beginning
of all GOT entries.

Same as ld after relro support the GOT layout in gold now look like this with
this patch:

      +----------------------------------+
      |got[0]: DYNAMIC                   |   <--- _GLOBAL_OFFSET_TABLE_ ==
DT_PLTGOT .got
      |got[1]: link_map parm             |
      |got[2]: &_dl_runtime_resolve      |
      +----------------------------------+
      |                                  |   non-plt GOT entries
      |                                  |
      |                                  |
      +----------------------------------+
      |                                  |   <--- .gotplt, PLT GOT entries
      |                                  |
      |                                  |
      |                                  |
      +----------------------------------+

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