WebSVN – Kolibri OS – Diff – /contrib/toolchain/binutils/bfd/elf-ifunc.c

 /* ELF STT_GNU_IFUNC support.
-   Copyright 2009-2013
-   Free Software Foundation, Inc.
+   Copyright (C) 2009-2015 Free Software Foundation, Inc.
    This file is part of BFD, the Binary File Descriptor library.
   else
     pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
   if (bed->plt_readonly)
     pltflags |= SEC_READONLY;
-  if (info->shared)
+  if (bfd_link_pic (info))
+    {
       /* We need to create .rel[a].ifunc for shared objects.  */
       const char *rel_sec = (bed->rela_plts_and_copies_p
   /* When a shared library references a STT_GNU_IFUNC symbol defined
      in executable, the address of the resolved function may be used.
      But in non-shared executable, the address of its .plt slot may
      be used.  Pointer equality may not work correctly.  PIE should
      be used if pointer equality is required here.  */
-  if (!info->shared
+  if (!bfd_link_pic (info)
       && (h->dynindx != -1
 	  || info->export_dynamic)
       && h->pointer_equality_needed)
+    {
       info->callbacks->einfo
   htab = elf_hash_table (info);
   /* When building shared library, we need to handle the case where it is
      marked with regular reference, but not non-GOT reference since the
      non-GOT reference bit may not be set here.  */
-  if (info->shared && !h->non_got_ref && h->ref_regular)
+  if (bfd_link_pic (info) && !h->non_got_ref && h->ref_regular)
     for (p = *head; p != NULL; p = p->next)
       if (p->count)
+	{
 	  h->non_got_ref = 1;
   relplt->size += sizeof_reloc;
   relplt->reloc_count++;
   /* We need dynamic relocation for STT_GNU_IFUNC symbol only when
      there is a non-GOT reference in a shared object.  */
-  if (!info->shared
+  if (!bfd_link_pic (info)
       || !h->non_got_ref)
     *head = NULL;
 . Use .got.plt if .got isn't used.
 . Otherwise use .got so that it can be shared among different
      objects at run-time.
      We only need to relocate .got entry in shared object.  */
   if (h->got.refcount <= 0
-      || (info->shared
+      || (bfd_link_pic (info)
 	  && (h->dynindx == -1
 	      || h->forced_local))
-      || (!info->shared
+      || (!bfd_link_pic (info)
 	  && !h->pointer_equality_needed)
-      || (info->executable && info->shared)
+      || bfd_link_pie (info)
       || htab->sgot == NULL)
+    {
       /* Use .got.plt.  */
       h->got.offset = (bfd_vma) -1;
+    }
   else
+    {
       h->got.offset = htab->sgot->size;
       htab->sgot->size += got_entry_size;
-      if (info->shared)
+      if (bfd_link_pic (info))
 	htab->srelgot->size += sizeof_reloc;
+    }
   return TRUE;
+}
+/* Similar to _bfd_elf_get_synthetic_symtab, optimized for unsorted PLT
+   entries.  PLT is the PLT section.  PLT_SYM_VAL is a function pointer
+   which returns an array of PLT entry symbol values.  */
+long
+_bfd_elf_ifunc_get_synthetic_symtab
+  (bfd *abfd, long symcount ATTRIBUTE_UNUSED,
+   asymbol **syms ATTRIBUTE_UNUSED, long dynsymcount, asymbol **dynsyms,
+   asymbol **ret, asection *plt,
+   bfd_vma *(*get_plt_sym_val) (bfd *, asymbol **, asection *, asection *))
+{
+  const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+  asection *relplt;
+  asymbol *s;
+  const char *relplt_name;
+  bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
+  arelent *p;
+  long count, i, n;
+  size_t size;
+  Elf_Internal_Shdr *hdr;
+  char *names;
+  bfd_vma *plt_sym_val;
+  *ret = NULL;
+  if (plt == NULL)
+    return 0;
+  if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
+    return 0;
+  if (dynsymcount <= 0)
+    return 0;
+  relplt_name = bed->relplt_name;
+  if (relplt_name == NULL)
+    relplt_name = bed->rela_plts_and_copies_p ? ".rela.plt" : ".rel.plt";
+  relplt = bfd_get_section_by_name (abfd, relplt_name);
+  if (relplt == NULL)
+    return 0;
+  hdr = &elf_section_data (relplt)->this_hdr;
+  if (hdr->sh_link != elf_dynsymtab (abfd)
+      || (hdr->sh_type != SHT_REL && hdr->sh_type != SHT_RELA))
+    return 0;
+  slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
+  if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
+    return -1;
+  count = relplt->size / hdr->sh_entsize;
+  size = count * sizeof (asymbol);
+  p = relplt->relocation;
+  for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel)
+    {
+      size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
+      if (p->addend != 0)
+	{
+#ifdef BFD64
+	  size += sizeof ("+0x") - 1 + 8 + 8 * (bed->s->elfclass == ELFCLASS64);
+#else
+	  size += sizeof ("+0x") - 1 + 8;
+#endif
+	}
+    }
+  plt_sym_val = get_plt_sym_val (abfd, dynsyms, plt, relplt);
+  if (plt_sym_val == NULL)
+    return -1;
+  s = *ret = (asymbol *) bfd_malloc (size);
+  if (s == NULL)
+    {
+      free (plt_sym_val);
+      return -1;
+    }
+  names = (char *) (s + count);
+  p = relplt->relocation;
+  n = 0;
+  for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel)
+    {
+      size_t len;
+      bfd_vma addr;
+      addr = plt_sym_val[i];
+      if (addr == (bfd_vma) -1)
+	continue;
+      *s = **p->sym_ptr_ptr;
+      /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set.  Since
+	 we are defining a symbol, ensure one of them is set.  */
+      if ((s->flags & BSF_LOCAL) == 0)
+	s->flags |= BSF_GLOBAL;
+      s->flags |= BSF_SYNTHETIC;
+      s->section = plt;
+      s->value = addr - plt->vma;
+      s->name = names;
+      s->udata.p = NULL;
+      len = strlen ((*p->sym_ptr_ptr)->name);
+      memcpy (names, (*p->sym_ptr_ptr)->name, len);
+      names += len;
+      if (p->addend != 0)
+	{
+	  char buf[30], *a;
+	  memcpy (names, "+0x", sizeof ("+0x") - 1);
+	  names += sizeof ("+0x") - 1;
+	  bfd_sprintf_vma (abfd, buf, p->addend);
+	  for (a = buf; *a == '0'; ++a)
+	    ;
+	  len = strlen (a);
+	  memcpy (names, a, len);
+	  names += len;
+	}
+      memcpy (names, "@plt", sizeof ("@plt"));
+      names += sizeof ("@plt");
+      ++s, ++n;
+    }
+  free (plt_sym_val);
+  return n;

Subversion Repositories Kolibri OS

(root)/contrib/toolchain/binutils/bfd/elf-ifunc.c – Rev 5197 → 6324