Simplify ppc64 code setting toc_off.
Every function has a nominal toc pointer value, even if it isn't used, so set toc_off for every code section to the value used in that object file. The thinking here was that if a code section didn't use the toc it could use the previous object file's toc pointer value. It can, but doing so is only a gain if functions in that section are called mostly from previous objects sharing the same toc. We lose if the functions in question are called mostly from the current object or following objects, and it's a good bet they will probably mostly be called from the current object. * elf64-ppc.c (ppc64_elf_next_input_section): Always set toc_off to value for object file.
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2013-11-02 Alan Modra <amodra@gmail.com>
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* elf64-ppc.c (ppc64_elf_next_input_section): Always set toc_off
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to value for object file.
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2013-11-01 Roland McGrath <mcgrathr@google.com>
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2013-11-01 Roland McGrath <mcgrathr@google.com>
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* elf-nacl.c (segment_eligible_for_headers): Drop requirement that
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* elf-nacl.c (segment_eligible_for_headers): Drop requirement that
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@ -11508,42 +11508,25 @@ ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec)
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if (htab->multi_toc_needed)
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if (htab->multi_toc_needed)
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{
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{
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/* If a code section has a function that uses the TOC then we need
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/* Analyse sections that aren't already flagged as needing a
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to use the right TOC (obviously). Also, make sure that .opd gets
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valid toc pointer. Exclude .fixup for the linux kernel.
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the correct TOC value for R_PPC64_TOC relocs that don't have or
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.fixup contains branches, but only back to the function that
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can't find their function symbol (shouldn't ever happen now).
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hit an exception. */
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Also specially treat .fixup for the linux kernel. .fixup
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if (!(isec->has_toc_reloc
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contains branches, but only back to the function that hit an
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|| (isec->flags & SEC_CODE) == 0
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exception. */
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|| strcmp (isec->name, ".fixup") == 0
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if (isec->has_toc_reloc
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|| isec->call_check_done))
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|| (isec->flags & SEC_CODE) == 0
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|| strcmp (isec->name, ".fixup") == 0)
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{
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{
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if (elf_gp (isec->owner) != 0)
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if (toc_adjusting_stub_needed (info, isec) < 0)
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htab->toc_curr = elf_gp (isec->owner);
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}
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else
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{
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if (!isec->call_check_done
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&& toc_adjusting_stub_needed (info, isec) < 0)
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return FALSE;
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return FALSE;
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/* If we make a local call from this section, ie. a branch
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without a following nop, then we have no place to put a
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toc restoring insn. We must use the same toc group as
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the callee.
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Testing makes_toc_func_call actually tests for *any*
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calls to functions that need a good toc pointer. A more
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precise test would be better, as this one will set
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incorrect values for pasted .init/.fini fragments.
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(Fixed later in check_pasted_section.) */
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if (isec->makes_toc_func_call
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&& elf_gp (isec->owner) != 0)
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htab->toc_curr = elf_gp (isec->owner);
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}
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}
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/* Make all sections use the TOC assigned for this object file.
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This will be wrong for pasted sections; We fix that in
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check_pasted_section(). */
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if (elf_gp (isec->owner) != 0)
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htab->toc_curr = elf_gp (isec->owner);
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}
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}
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/* Functions that don't use the TOC can belong in any TOC group.
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Use the last TOC base. */
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htab->stub_group[isec->id].toc_off = htab->toc_curr;
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htab->stub_group[isec->id].toc_off = htab->toc_curr;
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return TRUE;
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return TRUE;
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}
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}
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