Make undefined symbols in allocate_dynrelocs dynamic
..if they have dynamic relocs. An undefined symbol in a PIC object that finds no definition ought to become dynamic in order to support --allow-shlib-undefined, but there is nothing in the generic ELF linker code to do this if the reference isn't via the GOT or PLT. (An initialized function pointer is an example.) So it falls to backend code to ensure the symbol is made dynamic. PR 21988 * elf64-ppc.c (ensure_undef_dynamic): Rename from ensure_undefweak_dynamic. Handle undefined too. * elf32-ppc.c (ensure_undef_dynamic): Likewise. * elf32-hppa.c (ensure_undef_dynamic): Likewise. (allocate_dynrelocs): Discard undefined non-default visibility relocs first. Make undefined syms dynamic. Tidy goto.
This commit is contained in:
Alan Modra
parent
bb4b64b0db
commit
46434633f9
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@ -1,3 +1,13 @@
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2017-08-23 Alan Modra <amodra@gmail.com>
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PR 21988
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* elf64-ppc.c (ensure_undef_dynamic): Rename from
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ensure_undefweak_dynamic. Handle undefined too.
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* elf32-ppc.c (ensure_undef_dynamic): Likewise.
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* elf32-hppa.c (ensure_undef_dynamic): Likewise.
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(allocate_dynrelocs): Discard undefined non-default visibility
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relocs first. Make undefined syms dynamic. Tidy goto.
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2017-08-21 Alan Modra <amodra@gmail.com>
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H.J. Lu <hongjiu.lu@intel.com>
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@ -1919,16 +1919,20 @@ elf32_hppa_adjust_dynamic_symbol (struct bfd_link_info *info,
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return _bfd_elf_adjust_dynamic_copy (info, eh, sec);
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}
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/* Make an undefined weak symbol dynamic. */
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/* If EH is undefined, make it dynamic if that makes sense. */
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static bfd_boolean
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ensure_undef_weak_dynamic (struct bfd_link_info *info,
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struct elf_link_hash_entry *eh)
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ensure_undef_dynamic (struct bfd_link_info *info,
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struct elf_link_hash_entry *eh)
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{
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if (eh->dynindx == -1
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struct elf_link_hash_table *htab = elf_hash_table (info);
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if (htab->dynamic_sections_created
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&& (eh->root.type == bfd_link_hash_undefweak
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|| eh->root.type == bfd_link_hash_undefined)
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&& eh->dynindx == -1
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&& !eh->forced_local
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&& eh->type != STT_PARISC_MILLI
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&& eh->root.type == bfd_link_hash_undefweak
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&& ELF_ST_VISIBILITY (eh->other) == STV_DEFAULT)
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return bfd_elf_link_record_dynamic_symbol (info, eh);
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return TRUE;
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@ -1957,7 +1961,7 @@ allocate_plt_static (struct elf_link_hash_entry *eh, void *inf)
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if (htab->etab.dynamic_sections_created
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&& eh->plt.refcount > 0)
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{
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if (!ensure_undef_weak_dynamic (info, eh))
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if (!ensure_undef_dynamic (info, eh))
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return FALSE;
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if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), eh))
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@ -2034,7 +2038,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
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if (eh->got.refcount > 0)
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{
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if (!ensure_undef_weak_dynamic (info, eh))
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if (!ensure_undef_dynamic (info, eh))
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return FALSE;
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sec = htab->etab.sgot;
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@ -2070,8 +2074,14 @@ allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
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changes. */
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if (bfd_link_pic (info))
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{
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/* Discard relocs on undefined syms with non-default visibility. */
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if ((eh->root.type == bfd_link_hash_undefined
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|| eh->root.type == bfd_link_hash_undefweak)
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&& ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT)
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hh->dyn_relocs = NULL;
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#if RELATIVE_DYNRELOCS
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if (SYMBOL_CALLS_LOCAL (info, eh))
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else if (SYMBOL_CALLS_LOCAL (info, eh))
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{
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struct elf32_hppa_dyn_reloc_entry **hdh_pp;
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@ -2087,15 +2097,9 @@ allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
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}
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#endif
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/* Also discard relocs on undefined weak syms with non-default
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visibility. */
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if (hh->dyn_relocs != NULL
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&& eh->root.type == bfd_link_hash_undefweak)
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if (hh->dyn_relocs != NULL)
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{
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if (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT)
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hh->dyn_relocs = NULL;
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else if (!ensure_undef_weak_dynamic (info, eh))
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if (!ensure_undef_dynamic (info, eh))
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return FALSE;
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}
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}
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@ -2113,19 +2117,14 @@ allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf)
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&& (eh->root.type == bfd_link_hash_undefweak
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|| eh->root.type == bfd_link_hash_undefined))))
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{
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if (!ensure_undef_weak_dynamic (info, eh))
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if (!ensure_undef_dynamic (info, eh))
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return FALSE;
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/* If that succeeded, we know we'll be keeping all the
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relocs. */
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if (eh->dynindx != -1)
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goto keep;
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if (eh->dynindx == -1)
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hh->dyn_relocs = NULL;
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}
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hh->dyn_relocs = NULL;
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return TRUE;
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keep: ;
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else
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hh->dyn_relocs = NULL;
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}
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/* Finally, allocate space. */
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@ -5942,17 +5942,18 @@ allocate_got (struct ppc_elf_link_hash_table *htab, unsigned int need)
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return where;
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}
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/* If H is undefined weak, make it dynamic if that makes sense. */
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/* If H is undefined, make it dynamic if that makes sense. */
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static bfd_boolean
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ensure_undefweak_dynamic (struct bfd_link_info *info,
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struct elf_link_hash_entry *h)
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ensure_undef_dynamic (struct bfd_link_info *info,
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struct elf_link_hash_entry *h)
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{
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struct elf_link_hash_table *htab = elf_hash_table (info);
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if (htab->dynamic_sections_created
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&& info->dynamic_undefined_weak != 0
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&& h->root.type == bfd_link_hash_undefweak
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&& ((info->dynamic_undefined_weak != 0
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&& h->root.type == bfd_link_hash_undefweak)
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|| h->root.type == bfd_link_hash_undefined)
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&& h->dynindx == -1
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&& !h->forced_local
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&& ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
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@ -5986,9 +5987,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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{
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unsigned int need;
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/* Make sure this symbol is output as a dynamic symbol.
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Undefined weak syms won't yet be marked as dynamic. */
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if (!ensure_undefweak_dynamic (info, &eh->elf))
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/* Make sure this symbol is output as a dynamic symbol. */
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if (!ensure_undef_dynamic (info, &eh->elf))
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return FALSE;
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need = 0;
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@ -6102,9 +6102,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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if (eh->dyn_relocs != NULL)
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{
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/* Make sure undefined weak symbols are output as a dynamic
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symbol in PIEs. */
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if (!ensure_undefweak_dynamic (info, h))
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/* Make sure this symbol is output as a dynamic symbol. */
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if (!ensure_undef_dynamic (info, h))
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return FALSE;
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}
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}
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@ -6120,9 +6119,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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&& eh->has_addr16_lo
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&& htab->params->pic_fixup > 0))
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{
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/* Make sure this symbol is output as a dynamic symbol.
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Undefined weak syms won't yet be marked as dynamic. */
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if (!ensure_undefweak_dynamic (info, h))
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/* Make sure this symbol is output as a dynamic symbol. */
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if (!ensure_undef_dynamic (info, h))
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return FALSE;
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if (h->dynindx == -1)
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@ -9743,17 +9743,18 @@ merge_got_entries (struct got_entry **pent)
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}
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}
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/* If H is undefined weak, make it dynamic if that makes sense. */
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/* If H is undefined, make it dynamic if that makes sense. */
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static bfd_boolean
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ensure_undefweak_dynamic (struct bfd_link_info *info,
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struct elf_link_hash_entry *h)
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ensure_undef_dynamic (struct bfd_link_info *info,
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struct elf_link_hash_entry *h)
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{
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struct elf_link_hash_table *htab = elf_hash_table (info);
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if (htab->dynamic_sections_created
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&& info->dynamic_undefined_weak != 0
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&& h->root.type == bfd_link_hash_undefweak
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&& ((info->dynamic_undefined_weak != 0
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&& h->root.type == bfd_link_hash_undefweak)
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|| h->root.type == bfd_link_hash_undefined)
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&& h->dynindx == -1
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&& !h->forced_local
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&& ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
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@ -9832,9 +9833,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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for (gent = h->got.glist; gent != NULL; gent = gent->next)
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if (!gent->is_indirect)
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{
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/* Make sure this symbol is output as a dynamic symbol.
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Undefined weak syms won't yet be marked as dynamic. */
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if (!ensure_undefweak_dynamic (info, h))
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/* Make sure this symbol is output as a dynamic symbol. */
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if (!ensure_undef_dynamic (info, h))
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return FALSE;
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if (!is_ppc64_elf (gent->owner))
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@ -9888,9 +9888,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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if (eh->dyn_relocs != NULL)
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{
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/* Make sure this symbol is output as a dynamic symbol.
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Undefined weak syms won't yet be marked as dynamic. */
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if (!ensure_undefweak_dynamic (info, h))
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/* Make sure this symbol is output as a dynamic symbol. */
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if (!ensure_undef_dynamic (info, h))
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return FALSE;
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}
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}
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@ -9925,9 +9924,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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if (!h->non_got_ref
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&& !h->def_regular)
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{
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/* Make sure this symbol is output as a dynamic symbol.
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Undefined weak syms won't yet be marked as dynamic. */
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if (!ensure_undefweak_dynamic (info, h))
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/* Make sure this symbol is output as a dynamic symbol. */
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if (!ensure_undef_dynamic (info, h))
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return FALSE;
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if (h->dynindx == -1)
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