[Bug binutils/16952] PowerPC LD requests bug report. Issue related to EABI symbols _SDA_BASE_, _SDA2_BASE_

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https://sourceware.org/bugzilla/show_bug.cgi?id=16952

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=93d1b056cb396d6468781fe0e40dd769891bed32

commit 93d1b056cb396d6468781fe0e40dd769891bed32
Author: Alan Modra <address@hidden>
Date:   Tue May 20 11:42:42 2014 +0930

    Rewrite ppc32 backend .sdata and .sdata2 handling

    1) _SDA_BASE_ and _SDA2_BASE_ and defined automatically, in a similar
       manner to the way _GLOBAL_OFFSET_TABLE_ is handled.  It's a little
       more complicated to remove the symbols because _SDA_BASE_ needs to
       be there if either .sdata or .sbss is present, and similarly for
       _SDA2_BASE.
    2) The linker created .sdata and .sdata2 sections used for
       R_PPC_EMB_SDAI16 and R_PPC_EMB_SDA2I16 pointers are created early.
       Nowadays we strip unneeded sections from the output, so it isn't
       necessary to delay creating the sections.
    3) The output section for targets of various SDA relocs is now checked
       as per the ABI(s).  We previously allowed .sdata.foo and similar,
       most likely because at some stage we were checking input sections.

    Also, the patch fixes a long-standing bug in size_input_sections
    that affects the values of symbols defined in stripped input
    sections.

        PR 16952
    bfd/
        * elf32-ppc.c (ppc_elf_create_linker_section): Move earlier.
        Remove redundant setting of htab->elf.dynobj.  Don't align.
        Define .sdata symbols using _bfd_elf_define_linkage_sym.
        (ppc_elf_create_glink): Call ppc_elf_create_linker_section.
        (create_sdata_sym): Delete.
        (elf_allocate_pointer_linker_section): Rename from
        elf_create_pointer_linker_section.  Align section.
        (ppc_elf_check_relocs): Don't call ppc_elf_creat_linker_section
        directly here, or create_sdata_sym.  Set ref_regular on _SDA_BASE_
        and _SDA2_BASE_.
        (ppc_elf_size_dynamic_sections): Remove ATTRIBUTE_UNUSED on param.
        Remove unnecessary tests on _SDA_BASE_ sym.
        (maybe_strip_sdasym, ppc_elf_maybe_strip_sdata_syms): New functions.
        (ppc_elf_relocate_section): Tighten SDA reloc symbol section checks.
        * elf32-ppc.h (ppc_elf_set_sdata_syms): Delete.
        (ppc_elf_maybe_strip_sdata_syms): Declare.
    ld/
        * emulparams/elf32ppccommon.sh (_SDA_BASE_, _SDA2_BASE_): Delete.
        * emultempl/ppc32elf.em (ppc_before_allocation): Call
        ppc_elf_maybe_strip_sdata_syms.
        * ldlang.c (size_input_section): Correct output_offset value
        for excluded input sections.

-----------------------------------------------------------------------

Summary of changes:
 bfd/ChangeLog                   |   20 ++++
 bfd/elf32-ppc.c                 |  218 ++++++++++++++++++++-------------------
 bfd/elf32-ppc.h                 |    2 +-
 ld/ChangeLog                    |    9 ++
 ld/emulparams/elf32ppccommon.sh |    2 -
 ld/emultempl/ppc32elf.em        |    2 +
 ld/ldlang.c                     |   15 +--
 7 files changed, 150 insertions(+), 118 deletions(-)

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