001-debian.patch

用于生成linux操作系统下的交叉编译工具链和嵌入式linux系统的根文件系统,支持x86、arm、powerpc等处理器

-	        h->got.offset = sgot->_raw_size;
-
-	        /* Make sure this symbol is output as a dynamic symbol.  */
-	        if (h->dynindx == -1)
-		  if (! bfd_elf32_link_record_dynamic_symbol (info, h))
-		    return FALSE;
-
-	        srelgot->_raw_size += sizeof (Elf32_External_Rel);
+		h->got.refcount++;
 	      }
 	    else
 	      {
-	        /* This is a global offset table entry for a local
-                   symbol.  */
-	        if (local_got_offsets == NULL)
+		bfd_signed_vma *local_got_refcounts;
+
+		/* This is a global offset table entry for a local symbol.  */
+		local_got_refcounts = elf_local_got_refcounts (abfd);
+		if (local_got_refcounts == NULL)
 		  {
 		    bfd_size_type size;
-		    unsigned int i;
 
 		    size = symtab_hdr->sh_info;
-		    size *= sizeof (bfd_vma);
-		    local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size);
-		    if (local_got_offsets == NULL)
+		    size *= (sizeof (bfd_signed_vma) + sizeof(char));
+		    local_got_refcounts = ((bfd_signed_vma *)
+					   bfd_zalloc (abfd, size));
+		    if (local_got_refcounts == NULL)
 		      return FALSE;
-		    elf_local_got_offsets (abfd) = local_got_offsets;
-		    for (i = 0; i < symtab_hdr->sh_info; i++)
-		      local_got_offsets[i] = (bfd_vma) -1;
+		    elf_local_got_refcounts (abfd) = local_got_refcounts;
 		  }
-
-	        if (local_got_offsets[r_symndx] != (bfd_vma) -1)
-		  /* We have already allocated space in the .got.  */
-		  break;
-
-	        local_got_offsets[r_symndx] = sgot->_raw_size;
-
-	        if (info->shared)
-		  /* If we are generating a shared object, we need to
-		     output a R_ARM_RELATIVE reloc so that the dynamic
-		     linker can adjust this GOT entry.  */
-		  srelgot->_raw_size += sizeof (Elf32_External_Rel);
+		local_got_refcounts[r_symndx] += 1;
 	      }
-
-	    sgot->_raw_size += 4;
 	    break;
 
-	  case R_ARM_PLT32:
-	    /* This symbol requires a procedure linkage table entry.  We
-               actually build the entry in adjust_dynamic_symbol,
-               because this might be a case of linking PIC code which is
-               never referenced by a dynamic object, in which case we
-               don't need to generate a procedure linkage table entry
-               after all.  */
-
-	    /* If this is a local symbol, we resolve it directly without
-               creating a procedure linkage table entry.  */
-	    if (h == NULL)
-	      continue;
-
-	    h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
+	  case R_ARM_GOTOFF:
+	  case R_ARM_GOTPC:
+	    if (htab->sgot == NULL)
+	      {
+		if (htab->root.dynobj == NULL)
+		  htab->root.dynobj = abfd;
+		if (!create_got_section (htab->root.dynobj, info))
+		  return FALSE;
+	      }
 	    break;
 
 	  case R_ARM_ABS32:
 	  case R_ARM_REL32:
 	  case R_ARM_PC24:
+	    if (h != NULL && !info->shared)
+	      {
+		/* If this reloc is in a read-only section, we might
+		   need a copy reloc.  We can't check reliably at this
+		   stage whether the section is read-only, as input
+		   sections have not yet been mapped to output sections.
+		   Tentatively set the flag for now, and correct in
+		   adjust_dynamic_symbol.  */
+		h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
+		
+		/* We may need a .plt entry if the function this reloc
+		   refers to is in a shared lib.  */
+		h->plt.refcount += 1;
+	      }
+
 	    /* If we are creating a shared library, and this is a reloc
                against a global symbol, or a non PC relative reloc
                against a local symbol, then we need to copy the reloc
@@ -2784,14 +2987,17 @@
                possible that DEF_REGULAR is not set now but will be set
                later (it is never cleared).  We account for that
                possibility below by storing information in the
-               pcrel_relocs_copied field of the hash table entry.  */
+               relocs_copied field of the hash table entry.  */
 	    if (info->shared
-	      && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24
-	        || (h != NULL
-		  && (! info->symbolic
-		    || (h->elf_link_hash_flags
-		      & ELF_LINK_HASH_DEF_REGULAR) == 0))))
+		&& (sec->flags & SEC_ALLOC) != 0
+		&& (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24
+		    || (h != NULL
+			&& (! info->symbolic
+			    || (h->elf_link_hash_flags
+				& ELF_LINK_HASH_DEF_REGULAR) == 0))))
 	      {
+		struct elf32_arm_relocs_copied *p, **head;
+
 	        /* When creating a shared object, we must copy these
                    reloc types into the output file.  We create a reloc
                    section in dynobj and make room for this reloc.  */
@@ -2825,45 +3031,49 @@
 			    || ! bfd_set_section_alignment (dynobj, sreloc, 2))
 			  return FALSE;
 		      }
-		  if (sec->flags & SEC_READONLY)
-		    info->flags |= DF_TEXTREL;
+
+		    elf_section_data (sec)->sreloc = sreloc;
 		  }
 
-	        sreloc->_raw_size += sizeof (Elf32_External_Rel);
-	        /* If we are linking with -Bsymbolic, and this is a
-                   global symbol, we count the number of PC relative
-                   relocations we have entered for this symbol, so that
-                   we can discard them again if the symbol is later
-                   defined by a regular object.  Note that this function
-                   is only called if we are using an elf_i386 linker
-                   hash table, which means that h is really a pointer to
-                   an elf_i386_link_hash_entry.  */
-	        if (h != NULL && info->symbolic
-		    && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24)
+		/* If this is a global symbol, we count the number of
+		   relocations we need for this symbol.  */
+		if (h != NULL)
 		  {
-		    struct elf32_arm_link_hash_entry * eh;
-		    struct elf32_arm_pcrel_relocs_copied * p;
-
-		    eh = (struct elf32_arm_link_hash_entry *) h;
-
-		    for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
-		      if (p->section == sreloc)
-		        break;
-
+		    head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied;
+		  }
+		else
+		  {
+		    /* Track dynamic relocs needed for local syms too.
+		       We really need local syms available to do this
+		       easily.  Oh well.  */
+		    
+		    asection *s;
+		    s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
+						   sec, r_symndx);
+		    if (s == NULL)
+		      return FALSE;
+		    
+		    head = ((struct elf32_arm_relocs_copied **)
+			    &elf_section_data (s)->local_dynrel);
+		  }
+		
+		p = *head;
+		if (p == NULL || p->section != sec)
+		  {
+		    bfd_size_type amt = sizeof *p;
+		    p = bfd_alloc (htab->root.dynobj, amt);
 		    if (p == NULL)
-		      {
-		        p = ((struct elf32_arm_pcrel_relocs_copied *)
-			     bfd_alloc (dynobj, (bfd_size_type) sizeof * p));
-		        if (p == NULL)
-			  return FALSE;
-		        p->next = eh->pcrel_relocs_copied;
-		        eh->pcrel_relocs_copied = p;
-		        p->section = sreloc;
-		        p->count = 0;
-		      }
-
-		    ++p->count;
+		      return FALSE;
+		    p->next = *head;
+		    *head = p;
+		    p->section = sec;
+		    p->count = 0;
+		    p->pc_count = 0;
 		  }
+		
+		p->count += 1;
+		if (ELF32_R_TYPE (rel->r_info) == R_ARM_PC24)
+		  p->pc_count += 1;
 	      }
 	    break;
 
@@ -3003,71 +3213,29 @@
   if (h->type == STT_FUNC
       || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
     {
-      /* If we link a program (not a DSO), we'll get rid of unnecessary
-	 PLT entries; we point to the actual symbols -- even for pic
-	 relocs, because a program built with -fpic should have the same
-	 result as one built without -fpic, specifically considering weak
-	 symbols.
-	 FIXME: m68k and i386 differ here, for unclear reasons.  */
-      if (! info->shared
-	  && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0)
+      if (h->plt.refcount <= 0
+	  || SYMBOL_CALLS_LOCAL (info, h)
+	  || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
+	      && h->root.type == bfd_link_hash_undefweak))
 	{
 	  /* This case can occur if we saw a PLT32 reloc in an input
-	     file, but the symbol was not defined by a dynamic object.
-	     In such a case, we don't actually need to build a
-	     procedure linkage table, and we can just do a PC32 reloc
-	     instead.  */
-	  BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
+	     file, but the symbol was never referred to by a dynamic
+	     object, or if all references were garbage collected.  In
+	     such a case, we don't actually need to build a procedure
+	     linkage table, and we can just do a PC24 reloc instead.  */
+	  h->plt.offset = (bfd_vma) -1;
 	  h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
-	  return TRUE;
-	}
-
-      /* Make sure this symbol is output as a dynamic symbol.  */
-      if (h->dynindx == -1)
-	{
-	  if (! bfd_elf32_link_record_dynamic_symbol (info, h))
-	    return FALSE;
 	}
 
-      s = bfd_get_section_by_name (dynobj, ".plt");
-      BFD_ASSERT (s != NULL);
-
-      /* If this is the first .plt entry, make room for the special
-	 first entry.  */
-      if (s->_raw_size == 0)
-	s->_raw_size += PLT_ENTRY_SIZE;
-
-      /* If this symbol is not defined in a regular file, and we are
-	 not generating a shared library, then set the symbol to this
-	 location in the .plt.  This is required to make function
-	 pointers compare as equal between the normal executable and
-	 the shared library.  */
-      if (! info->shared
-	  && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
-	{
-	  h->root.u.def.section = s;
-	  h->root.u.def.value = s->_raw_size;
-	}
-
-      h->plt.offset = s->_raw_size;
-
-      /* Make room for this entry.  */
-      s->_raw_size += PLT_ENTRY_SIZE;
-
-      /* We also need to make an entry in the .got.plt section, which
-	 will be placed in the .got section by the linker script.  */
-      s = bfd_get_section_by_name (dynobj, ".got.plt");
-      BFD_ASSERT (s != NULL);
-      s->_raw_size += 4;
-
-      /* We also need to make an entry in the .rel.plt section.  */
-
-      s = bfd_get_section_by_name (dynobj, ".rel.plt");
-      BFD_ASSERT (s != NULL);
-      s->_raw_size += sizeof (Elf32_External_Rel);
-
       return TRUE;
     }
+  else
+    /* It's possible that we incorrectly decided a .plt reloc was
+       needed for an R_ARM_PC24 reloc to a non-function sym in
+       check_relocs.  We can't decide accurately between function and
+       non-function syms in check-relocs;  Objects loaded later in
+       the link may change h->type.  So fix it now.  */
+    h->plt.offset = (bfd_vma) -1;
 
   /* If this is a weak symbol, and there is a real definition, the
      processor independent code will have arranged for us to see the
@@ -3142,6 +3310,198 @@
   return TRUE;
 }
 
+/* Allocate space in .plt, .got and associated reloc sections for
+   dynamic relocs.  */
+
+static bfd_boolean
+allocate_dynrelocs (h, inf)
+     struct elf_link_hash_entry *h;
+     PTR inf;
+{
+  struct bfd_link_info *info;
+  struct elf32_arm_link_hash_table *htab;
+  struct elf32_arm_link_hash_entry *eh;
+  struct elf32_arm_relocs_copied *p;
+
+  if (h->root.type == bfd_link_hash_indirect)
+    return TRUE;
+
+  if (h->root.type == bfd_link_hash_warning)
+    /* When warning symbols are created, they **replace** the "real"
+       entry in the hash table, thus we never get to see the real
+       symbol in a hash traversal.  So look at it now.  */
+    h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+  info = (struct bfd_link_info *) inf;
+  htab = elf32_arm_hash_table (info);
+
+  if (htab->root.dynamic_sections_created
+      && h->plt.refcount > 0)
+    {
+      /* Make sure this symbol is output as a dynamic symbol.
+	 Undefined weak syms won't yet be marked as dynamic.  */
+      if (h->dynindx == -1
+	  && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
+	{
+	  if (! bfd_elf32_link_record_dynamic_symbol (info, h))
+	    return FALSE;
+	}
+
+      if (info->shared
+	  || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
+	{
+	  asection *s = htab->splt;
+
+	  /* If this is the first .plt entry, make room for the special
+	     first entry.  */
+	  if (s->_raw_size == 0)
+	    s->_raw_size += PLT_HEADER_SIZE;
+
+	  h->plt.offset = s->_raw_size;
+
+	  /* If this symbol is not defined in a regular file, and we are
+	     not generating a shared library, then set the symbol to this
+	     location in the .plt.  This is required to make function
+	     pointers compare as equal between the normal executable and
+	     the shared library.  */
+	  if (! info->shared
+	      && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
+	    {
+	      h->root.u.def.section = s;
+	      h->root.u.def.value = h->plt.offset;
+	    }
+
+	  /* Make room for this entry.  */
+	  s->_raw_size += PLT_ENTRY_SIZE;
+
+	  /* We also need to make an entry in the .got.plt section, which
+	     will be placed in the .got section by the linker script.  */
+	  htab->sgotplt->_raw_size += 4;
+
+	  /* We also need to make an entry in the .rel.plt section.  */
+	  htab->srelplt->_raw_size += sizeof (Elf32_External_Rel);
+	}
+      else
+	{
+	  h->plt.offset = (bfd_vma) -1;