[deliverable/binutils-gdb.git] / bfd / elf32-i386.c

/* Intel 80386/80486-specific support for 32-bit ELF
   Copyright 1993 Free Software Foundation, Inc.

This file is part of BFD, the Binary File Descriptor library.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "libelf.h"

static CONST struct reloc_howto_struct *elf_i386_reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));
static void elf_i386_info_to_howto
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static void elf_i386_info_to_howto_rel
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static boolean elf_i386_create_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_i386_create_got_section
  PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_i386_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
           const Elf_Internal_Rela *));
static boolean elf_i386_adjust_dynamic_symbol
  PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
static boolean elf_i386_size_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_i386_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
           Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static boolean elf_i386_finish_dynamic_symbol
  PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
           Elf_Internal_Sym *));
static boolean elf_i386_finish_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));

#define USE_REL 1               /* 386 uses REL relocations instead of RELA */

enum reloc_type
  {
    R_386_NONE = 0,
    R_386_32,
    R_386_PC32,
    R_386_GOT32,
    R_386_PLT32,
    R_386_COPY,
    R_386_GLOB_DAT,
    R_386_JUMP_SLOT,
    R_386_RELATIVE,
    R_386_GOTOFF,
    R_386_GOTPC,
    R_386_max
  };

#if 0
static CONST char *CONST reloc_type_names[] =
{
  "R_386_NONE",
  "R_386_32",
  "R_386_PC32",
  "R_386_GOT32",
  "R_386_PLT32",
  "R_386_COPY",
  "R_386_GLOB_DAT",
  "R_386_JUMP_SLOT",
  "R_386_RELATIVE",
  "R_386_GOTOFF",
  "R_386_GOTPC",
};
#endif

static reloc_howto_type elf_howto_table[]=
{
  HOWTO(R_386_NONE,      0,0, 0,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_NONE",     true,0x00000000,0x00000000,false),
  HOWTO(R_386_32,        0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_32",       true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_PC32,      0,2,32,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC32",     true,0xffffffff,0xffffffff,true),
  HOWTO(R_386_GOT32,     0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOT32",    true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_PLT32,     0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PLT32",    true,0xffffffff,0xffffffff,true),
  HOWTO(R_386_COPY,      0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_COPY",     true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_GLOB_DAT,  0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GLOB_DAT", true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_JUMP_SLOT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_JUMP_SLOT",true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_RELATIVE,  0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_GOTOFF,    0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTOFF",   true,0xffffffff,0xffffffff,false),
  HOWTO(R_386_GOTPC,     0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTPC",    true,0xffffffff,0xffffffff,true),
};

#ifdef DEBUG_GEN_RELOC
#define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
#else
#define TRACE(str)
#endif

static CONST struct reloc_howto_struct *
elf_i386_reloc_type_lookup (abfd, code)
     bfd *abfd;
     bfd_reloc_code_real_type code;
{
  switch (code)
    {
    case BFD_RELOC_NONE:
      TRACE ("BFD_RELOC_NONE");
      return &elf_howto_table[ (int)R_386_NONE ];

    case BFD_RELOC_32:
      TRACE ("BFD_RELOC_32");
      return &elf_howto_table[ (int)R_386_32 ];

    case BFD_RELOC_32_PCREL:
      TRACE ("BFD_RELOC_PC32");
      return &elf_howto_table[ (int)R_386_PC32 ];

    case BFD_RELOC_386_GOT32:
      TRACE ("BFD_RELOC_386_GOT32");
      return &elf_howto_table[ (int)R_386_GOT32 ];

    case BFD_RELOC_386_PLT32:
      TRACE ("BFD_RELOC_386_PLT32");
      return &elf_howto_table[ (int)R_386_PLT32 ];

    case BFD_RELOC_386_COPY:
      TRACE ("BFD_RELOC_386_COPY");
      return &elf_howto_table[ (int)R_386_COPY ];

    case BFD_RELOC_386_GLOB_DAT:
      TRACE ("BFD_RELOC_386_GLOB_DAT");
      return &elf_howto_table[ (int)R_386_GLOB_DAT ];

    case BFD_RELOC_386_JUMP_SLOT:
      TRACE ("BFD_RELOC_386_JUMP_SLOT");
      return &elf_howto_table[ (int)R_386_JUMP_SLOT ];

    case BFD_RELOC_386_RELATIVE:
      TRACE ("BFD_RELOC_386_RELATIVE");
      return &elf_howto_table[ (int)R_386_RELATIVE ];

    case BFD_RELOC_386_GOTOFF:
      TRACE ("BFD_RELOC_386_GOTOFF");
      return &elf_howto_table[ (int)R_386_GOTOFF ];

    case BFD_RELOC_386_GOTPC:
      TRACE ("BFD_RELOC_386_GOTPC");
      return &elf_howto_table[ (int)R_386_GOTPC ];

    default:
      break;
    }

  TRACE ("Unknown");
  return 0;
}

static void
elf_i386_info_to_howto (abfd, cache_ptr, dst)
     bfd                *abfd;
     arelent            *cache_ptr;
     Elf32_Internal_Rela *dst;
{
  BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_386_max);

  cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
}

static void
elf_i386_info_to_howto_rel (abfd, cache_ptr, dst)
     bfd                *abfd;
     arelent            *cache_ptr;
     Elf32_Internal_Rel *dst;
{
  BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_386_max);

  cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
}
\f
/* Functions for the i386 ELF linker.  */

/* The name of the dynamic interpreter.  This is put in the .interp
   section.  */

#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"

/* The size in bytes of an entry in the procedure linkage table.  */

#define PLT_ENTRY_SIZE 16

/* The first entry in an absolute procedure linkage table looks like
   this.  See the SVR4 ABI i386 supplement to see how this works.  */

static bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
{
  0xff, 0x35,   /* pushl contents of address */
  0, 0, 0, 0,   /* replaced with address of .got + 4.  */
  0xff, 0x25,   /* jmp indirect */
  0, 0, 0, 0,   /* replaced with address of .got + 8.  */
  0, 0, 0, 0    /* pad out to 16 bytes.  */
};

/* Subsequent entries in an absolute procedure linkage table look like
   this.  */

static bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
{
  0xff, 0x25,   /* jmp indirect */
  0, 0, 0, 0,   /* replaced with address of this symbol in .got.  */
  0x68,         /* pushl immediate */
  0, 0, 0, 0,   /* replaced with offset into relocation table.  */
  0xe9,         /* jmp relative */
  0, 0, 0, 0    /* replaced with offset to start of .plt.  */
};

/* The first entry in a PIC procedure linkage table look like this.  */

static bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
{
  0xff, 0xb3, 4, 0, 0, 0,       /* pushl 4(%ebx) */     
  0xff, 0xa3, 8, 0, 0, 0,       /* jmp *8(%ebx) */      
  0, 0, 0, 0                    /* pad out to 16 bytes.  */
};

/* Subsequent entries in a PIC procedure linkage table look like this.  */

static bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
{
  0xff, 0xa3,   /* jmp *offset(%ebx) */
  0, 0, 0, 0,   /* replaced with offset of this symbol in .got.  */
  0x68,         /* pushl immediate */
  0, 0, 0, 0,   /* replaced with offset into relocation table.  */
  0xe9,         /* jmp relative */
  0, 0, 0, 0    /* replaced with offset to start of .plt.  */
};

/* Create dynamic sections when linking against a dynamic object.  */

static boolean
elf_i386_create_dynamic_sections (abfd, info)
     bfd *abfd;
     struct bfd_link_info *info;
{
  flagword flags;
  register asection *s;

  /* We need to create .plt, .rel.plt, .got, .got.plt, .dynbss, and
     .rel.bss sections.  */

  flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;

  s = bfd_make_section (abfd, ".plt");
  if (s == NULL
      || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY | SEC_CODE)
      || ! bfd_set_section_alignment (abfd, s, 2))
    return false;

  s = bfd_make_section (abfd, ".rel.plt");
  if (s == NULL
      || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
      || ! bfd_set_section_alignment (abfd, s, 2))
    return false;

  if (! elf_i386_create_got_section (abfd, info))
    return false;

  /* The .dynbss section is a place to put symbols which are defined
     by dynamic objects, are referenced by regular objects, and are
     not functions.  We must allocate space for them in the process
     image and use a R_386_COPY reloc to tell the dynamic linker to
     initialize them at run time.  The linker script puts the .dynbss
     section into the .bss section of the final image.  */
  s = bfd_make_section (abfd, ".dynbss");
  if (s == NULL
      || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
    return false;

  /* The .rel.bss section holds copy relocs.  This section is not
     normally needed.  We need to create it here, though, so that the
     linker will map it to an output section.  We can't just create it
     only if we need it, because we will not know whether we need it
     until we have seen all the input files, and the first time the
     main linker code calls BFD after examining all the input files
     (size_dynamic_sections) the input sections have already been
     mapped to the output sections.  If the section turns out not to
     be needed, we can discard it later.  We will never need this
     section when generating a shared object, since they do not use
     copy relocs.  */
  if (! info->shared)
    {
      s = bfd_make_section (abfd, ".rel.bss");
      if (s == NULL
          || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
          || ! bfd_set_section_alignment (abfd, s, 2))
        return false;
    }

  return true;
}

/* Create the .got section to hold the global offset table, and the
   .got.plt section to hold procedure linkage table GOT entries.  The
   linker script will put .got.plt into the output .got section.  */

static boolean
elf_i386_create_got_section (abfd, info)
     bfd *abfd;
     struct bfd_link_info *info;
{
  flagword flags;
  register asection *s;
  struct elf_link_hash_entry *h;

  /* This function may be called more than once.  */
  if (bfd_get_section_by_name (abfd, ".got") != NULL)
    return true;

  flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;

  s = bfd_make_section (abfd, ".got");
  if (s == NULL
      || ! bfd_set_section_flags (abfd, s, flags)
      || ! bfd_set_section_alignment (abfd, s, 2))
    return false;

  s = bfd_make_section (abfd, ".got.plt");
  if (s == NULL
      || ! bfd_set_section_flags (abfd, s, flags)
      || ! bfd_set_section_alignment (abfd, s, 2))
    return false;

  /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the
     .got.plt section, which will be placed at the start of the output
     .got section.  We don't do this in the linker script because we
     don't want to define the symbol if we are not creating a global
     offset table.  */
  h = NULL;
  if (! (_bfd_generic_link_add_one_symbol
         (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, (bfd_vma) 0,
          (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
          (struct bfd_link_hash_entry **) &h)))
    return false;
  h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
  h->type = STT_OBJECT;

  if (info->shared
      && ! bfd_elf32_link_record_dynamic_symbol (info, h))
    return false;

  /* The first three global offset table entries are reserved.  */
  s->_raw_size += 3 * 4;

  return true;
}

/* Look through the relocs for a section during the first phase, and
   allocate space in the global offset table or procedure linkage
   table.  */

static boolean
elf_i386_check_relocs (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  bfd *dynobj;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_vma *local_got_offsets;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;
  asection *sgot;
  asection *srelgot;
  asection *sreloc;

  if (info->relocateable)
    return true;

  dynobj = elf_hash_table (info)->dynobj;
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  local_got_offsets = elf_local_got_offsets (abfd);

  sgot = NULL;
  srelgot = NULL;
  sreloc = NULL;

  rel_end = relocs + sec->reloc_count;
  for (rel = relocs; rel < rel_end; rel++)
    {
      long r_symndx;
      struct elf_link_hash_entry *h;

      r_symndx = ELF32_R_SYM (rel->r_info);

      if (r_symndx < symtab_hdr->sh_info)
        h = NULL;
      else
        h = sym_hashes[r_symndx - symtab_hdr->sh_info];

      /* Some relocs require a global offset table.  */
      if (dynobj == NULL)
        {
          switch (ELF32_R_TYPE (rel->r_info))
            {
            case R_386_GOT32:
            case R_386_GOTOFF:
            case R_386_GOTPC:
              elf_hash_table (info)->dynobj = dynobj = abfd;
              if (! elf_i386_create_got_section (dynobj, info))
                return false;
              break;

            default:
              break;
            }
        }

      switch (ELF32_R_TYPE (rel->r_info))
        {
        case R_386_GOT32:
          /* This symbol requires a global offset table entry.  */
     
          if (sgot == NULL)
            {
              sgot = bfd_get_section_by_name (dynobj, ".got");
              BFD_ASSERT (sgot != NULL);
            }

          if (srelgot == NULL
              && (h != NULL || info->shared))
            {
              srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
              if (srelgot == NULL)
                {
                  srelgot = bfd_make_section (dynobj, ".rel.got");
                  if (srelgot == NULL
                      || ! bfd_set_section_flags (dynobj, srelgot,
                                                  (SEC_ALLOC
                                                   | SEC_LOAD
                                                   | SEC_HAS_CONTENTS
                                                   | SEC_IN_MEMORY
                                                   | SEC_READONLY))
                      || ! bfd_set_section_alignment (dynobj, srelgot, 2))
                    return false;
                }
            }

          if (h != NULL)
            {
              if (h->got_offset != (bfd_vma) -1)
                {
                  /* We have already allocated space in the .got.  */
                  break;
                }
              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);
            }
          else
            {
              /* This is a global offset table entry for a local
                 symbol.  */
              if (local_got_offsets == NULL)
                {
                  size_t size;
                  register int i;

                  size = symtab_hdr->sh_info * sizeof (bfd_vma);
                  local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size);
                  if (local_got_offsets == NULL)
                    {
                      bfd_set_error (bfd_error_no_memory);
                      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;
                }
              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_386_RELATIVE reloc so that the dynamic
                     linker can adjust this GOT entry.  */
                  srelgot->_raw_size += sizeof (Elf32_External_Rel);
                }
            }

          sgot->_raw_size += 4;

          break;

        case R_386_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 without
             linking in any dynamic objects, in which case we don't
             need to generate a procedure linkage table after all.  */
          
          /* If this is a local symbol, we resolve it directly without
             creating a procedure linkage table entry.  */
          if (h == NULL)
            continue;

          /* 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;
            }

          h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;

          break;

        case R_386_32:
        case R_386_PC32:
          if (info->shared
              && (sec->flags & SEC_ALLOC) != 0)
            {
              /* 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.  */
              if (sreloc == NULL)
                {
                  const char *name;

                  name = (elf_string_from_elf_section
                          (abfd,
                           elf_elfheader (abfd)->e_shstrndx,
                           elf_section_data (sec)->rel_hdr.sh_name));
                  if (name == NULL)
                    return false;

                  BFD_ASSERT (strncmp (name, ".rel", 4) == 0
                              && strcmp (bfd_get_section_name (abfd, sec),
                                         name + 4) == 0);

                  sreloc = bfd_get_section_by_name (dynobj, name);
                  if (sreloc == NULL)
                    {
                      sreloc = bfd_make_section (dynobj, name);
                      if (sreloc == NULL
                          || ! bfd_set_section_flags (dynobj, sreloc,
                                                      (SEC_ALLOC
                                                       | SEC_LOAD
                                                       | SEC_HAS_CONTENTS
                                                       | SEC_IN_MEMORY
                                                       | SEC_READONLY))
                          || ! bfd_set_section_alignment (dynobj, sreloc, 2))
                        return false;
                    }
                }

              sreloc->_raw_size += sizeof (Elf32_External_Rel);
            }
             
          break;

        default:
          break;
        }
    }

  return true;
}

/* Adjust a symbol defined by a dynamic object and referenced by a
   regular object.  The current definition is in some section of the
   dynamic object, but we're not including those sections.  We have to
   change the definition to something the rest of the link can
   understand.  */

static boolean
elf_i386_adjust_dynamic_symbol (info, h)
     struct bfd_link_info *info;
     struct elf_link_hash_entry *h;
{
  bfd *dynobj;
  asection *s;
  unsigned int power_of_two;

  dynobj = elf_hash_table (info)->dynobj;

  /* Make sure we know what is going on here.  */
  BFD_ASSERT (dynobj != NULL
              && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
                  || ((h->elf_link_hash_flags
                       & ELF_LINK_HASH_DEF_DYNAMIC) != 0
                      && (h->elf_link_hash_flags
                          & ELF_LINK_HASH_REF_REGULAR) != 0
                      && (h->elf_link_hash_flags
                          & ELF_LINK_HASH_DEF_REGULAR) == 0
                      && (elf_elfheader (h->root.u.def.section->owner)->e_type
                          == ET_DYN)
                      && h->root.type == bfd_link_hash_defined
                      && (bfd_get_flavour (h->root.u.def.section->owner)
                          == bfd_target_elf_flavour)
                      && h->root.u.def.section->output_section == NULL)));

  /* If this is a function, put it in the procedure linkage table.  We
     will fill in the contents of the procedure linkage table later,
     when we know the address of the .got section.  */
  if (h->type == STT_FUNC
      || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
    {
      if (! elf_hash_table (info)->dynamic_sections_created)
        {
          /* This case can occur if we saw a PLT32 reloc in an input
             file, but none of the input files were dynamic objects.
             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);
          return true;
        }

      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;
    }

  /* If this is a weak symbol, and there is a real definition, the
     processor independent code will have arranged for us to see the
     real definition first, and we can just use the same value.  */
  if (h->weakdef != NULL)
    {
      BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined);
      h->root.u.def.section = h->weakdef->root.u.def.section;
      h->root.u.def.value = h->weakdef->root.u.def.value;
      return true;
    }

  /* This is a reference to a symbol defined by a dynamic object which
     is not a function.  */

  /* If we are creating a shared library, we must presume that the
     only references to the symbol are via the global offset table.
     For such cases we need not do anything here; the relocations will
     be handled correctly by relocate_section.  */
  if (info->shared)
    return true;

  /* We must allocate the symbol in our .dynbss section, which will
     become part of the .bss section of the executable.  There will be
     an entry for this symbol in the .dynsym section.  The dynamic
     object will contain position independent code, so all references
     from the dynamic object to this symbol will go through the global
     offset table.  The dynamic linker will use the .dynsym entry to
     determine the address it must put in the global offset table, so
     both the dynamic object and the regular object will refer to the
     same memory location for the variable.  */

  s = bfd_get_section_by_name (dynobj, ".dynbss");
  BFD_ASSERT (s != NULL);

  /* If the symbol is currently defined in the .bss section of the
     dynamic object, then it is OK to simply initialize it to zero.
     If the symbol is in some other section, we must generate a
     R_386_COPY reloc to tell the dynamic linker to copy the initial
     value out of the dynamic object and into the runtime process
     image.  We need to remember the offset into the .rel.bss section
     we are going to use.  */
  if ((h->root.u.def.section->flags & SEC_LOAD) != 0)
    {
      asection *srel;

      srel = bfd_get_section_by_name (dynobj, ".rel.bss");
      BFD_ASSERT (srel != NULL);
      srel->_raw_size += sizeof (Elf32_External_Rel);
      h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
    }

  /* We need to figure out the alignment required for this symbol.  I
     have no idea how ELF linkers handle this.  */
  power_of_two = bfd_log2 (h->size);
  if (power_of_two > 3)
    power_of_two = 3;

  /* Apply the required alignment.  */
  s->_raw_size = BFD_ALIGN (s->_raw_size,
                            (bfd_size_type) (1 << power_of_two));
  if (power_of_two > bfd_get_section_alignment (dynobj, s))
    {
      if (! bfd_set_section_alignment (dynobj, s, power_of_two))
        return false;
    }

  /* Define the symbol as being at this point in the section.  */
  h->root.u.def.section = s;
  h->root.u.def.value = s->_raw_size;

  /* Increment the section size to make room for the symbol.  */
  s->_raw_size += h->size;

  return true;
}

/* Set the sizes of the dynamic sections.  */

static boolean
elf_i386_size_dynamic_sections (output_bfd, info)
     bfd *output_bfd;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *s;
  boolean plt;
  boolean relocs;
  boolean reltext;

  dynobj = elf_hash_table (info)->dynobj;
  BFD_ASSERT (dynobj != NULL);

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      /* Set the contents of the .interp section to the interpreter.  */
      if (! info->shared)
        {
          s = bfd_get_section_by_name (dynobj, ".interp");
          BFD_ASSERT (s != NULL);
          s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
          s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
        }
    }
  else
    {
      /* We may have created entries in the .rel.got section.
         However, if we are not creating the dynamic sections, we will
         not actually use these entries.  Reset the size of .rel.got,
         which will cause it to get stripped from the output file
         below.  */
      s = bfd_get_section_by_name (dynobj, ".rel.got");
      if (s != NULL)
        s->_raw_size = 0;
    }

  /* The check_relocs and adjust_dynamic_symbol entry points have
     determined the sizes of the various dynamic sections.  Allocate
     memory for them.  */
  plt = false;
  relocs = false;
  reltext = false;
  for (s = dynobj->sections; s != NULL; s = s->next)
    {
      const char *name;
      boolean strip;

      if ((s->flags & SEC_IN_MEMORY) == 0)
        continue;

      /* It's OK to base decisions on the section name, because none
         of the dynobj section names depend upon the input files.  */
      name = bfd_get_section_name (dynobj, s);

      strip = false;

      if (strcmp (name, ".plt") == 0)
        {
          if (s->_raw_size == 0)
            {
              /* Strip this section if we don't need it; see the
                 comment below.  */
              strip = true;
            }
          else
            {
              /* Remember whether there is a PLT.  */
              plt = true;
            }
        }
      else if (strncmp (name, ".rel", 4) == 0)
        {
          if (s->_raw_size == 0)
            {
              /* If we don't need this section, strip it from the
                 output file.  This is mostly to handle .rel.bss and
                 .rel.plt.  We must create both sections in
                 create_dynamic_sections, because they must be created
                 before the linker maps input sections to output
                 sections.  The linker does that before
                 adjust_dynamic_symbol is called, and it is that
                 function which decides whether anything needs to go
                 into these sections.  */
              strip = true;
            }
          else
            {
              asection *target;

              /* Remember whether there are any reloc sections other
                 than .rel.plt.  */
              if (strcmp (name, ".rel.plt") != 0)
                relocs = true;

              /* If this relocation section applies to a read only
                 section, then we probably need a DT_TEXTREL entry.  */
              target = bfd_get_section_by_name (output_bfd, name + 4);
              if (target != NULL
                  && (target->flags & SEC_READONLY) != 0)
                reltext = true;

              /* We use the reloc_count field as a counter if we need
                 to copy relocs into the output file.  */
              s->reloc_count = 0;
            }
        }
      else if (strncmp (name, ".got", 4) != 0)
        {
          /* It's not one of our sections, so don't allocate space.  */
          continue;
        }

      if (strip)
        {
          asection **spp;

          for (spp = &s->output_section->owner->sections;
               *spp != s->output_section;
               spp = &(*spp)->next)
            ;
          *spp = s->output_section->next;
          --s->output_section->owner->section_count;

          continue;
        }

      /* Allocate memory for the section contents.  */
      s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
      if (s->contents == NULL && s->_raw_size != 0)
        {
          bfd_set_error (bfd_error_no_memory);
          return false;
        }
    }
          
  if (elf_hash_table (info)->dynamic_sections_created)
    {
      /* Add some entries to the .dynamic section.  We fill in the
         values later, in elf_i386_finish_dynamic_sections, but we
         must add the entries now so that we get the correct size for
         the .dynamic section.  The DT_DEBUG entry is filled in by the
         dynamic linker and used by the debugger.  */
      if (! info->shared)
        {
          if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
            return false;
        }

      if (plt)
        {
          if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
              || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
              || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL)
              || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
            return false;
        }

      if (relocs)
        {
          if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0)
              || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0)
              || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT,
                                                sizeof (Elf32_External_Rel)))
            return false;
        }

      if (reltext)
        {
          if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
            return false;
        }
    }

  return true;
}

/* Relocate an i386 ELF section.  */

static boolean
elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
                           contents, relocs, local_syms, local_sections)
     bfd *output_bfd;
     struct bfd_link_info *info;
     bfd *input_bfd;
     asection *input_section;
     bfd_byte *contents;
     Elf_Internal_Rela *relocs;
     Elf_Internal_Sym *local_syms;
     asection **local_sections;
{
  bfd *dynobj;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_vma *local_got_offsets;
  asection *sgot;
  asection *splt;
  asection *sreloc;
  Elf_Internal_Rela *rel;
  Elf_Internal_Rela *relend;

  dynobj = elf_hash_table (info)->dynobj;
  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  local_got_offsets = elf_local_got_offsets (input_bfd);

  sgot = NULL;
  splt = NULL;
  sreloc = NULL;

  rel = relocs;
  relend = relocs + input_section->reloc_count;
  for (; rel < relend; rel++)
    {
      int r_type;
      reloc_howto_type *howto;
      long r_symndx;
      struct elf_link_hash_entry *h;
      Elf_Internal_Sym *sym;
      asection *sec;
      bfd_vma relocation;
      bfd_reloc_status_type r;

      r_type = ELF32_R_TYPE (rel->r_info);
      if (r_type < 0 || r_type >= (int) R_386_max)
        {
          bfd_set_error (bfd_error_bad_value);
          return false;
        }
      howto = elf_howto_table + r_type;

      r_symndx = ELF32_R_SYM (rel->r_info);

      if (info->relocateable)
        {
          /* This is a relocateable link.  We don't have to change
             anything, unless the reloc is against a section symbol,
             in which case we have to adjust according to where the
             section symbol winds up in the output section.  */
          if (r_symndx < symtab_hdr->sh_info)
            {
              sym = local_syms + r_symndx;
              if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
                {
                  bfd_vma val;

                  sec = local_sections[r_symndx];
                  val = bfd_get_32 (input_bfd, contents + rel->r_offset);
                  val += sec->output_offset + sym->st_value;
                  bfd_put_32 (input_bfd, val, contents + rel->r_offset);
                }
            }

          continue;
        }

      /* This is a final link.  */
      h = NULL;
      sym = NULL;
      sec = NULL;
      if (r_symndx < symtab_hdr->sh_info)
        {
          sym = local_syms + r_symndx;
          sec = local_sections[r_symndx];
          relocation = (sec->output_section->vma
                        + sec->output_offset
                        + sym->st_value);
        }
      else
        {
          h = sym_hashes[r_symndx - symtab_hdr->sh_info];
          if (h->root.type == bfd_link_hash_defined)
            {
              sec = h->root.u.def.section;
              if (r_type == R_386_GOTPC
                  || (r_type == R_386_PLT32
                      && h->plt_offset != (bfd_vma) -1)
                  || (r_type == R_386_GOT32
                      && elf_hash_table (info)->dynamic_sections_created)
                  || (info->shared
                      && (r_type == R_386_32
                          || r_type == R_386_PC32)
                      && (input_section->flags & SEC_ALLOC) != 0))
                {
                  /* In these cases, we don't need the relocation
                     value.  We check specially because in some
                     obscure cases sec->output_section will be NULL.  */
                  relocation = 0;
                }
              else
                relocation = (h->root.u.def.value
                              + sec->output_section->vma
                              + sec->output_offset);
            }
          else if (h->root.type == bfd_link_hash_weak)
            relocation = 0;
          else if (info->shared)
            relocation = 0;
          else
            {
              if (! ((*info->callbacks->undefined_symbol)
                     (info, h->root.root.string, input_bfd,
                      input_section, rel->r_offset)))
                return false;
              relocation = 0;
            }
        }

      switch (r_type)
        {
        case R_386_GOT32:
          /* Relocation is to the entry for this symbol in the global
             offset table.  */
          if (sgot == NULL)
            {
              sgot = bfd_get_section_by_name (dynobj, ".got");
              BFD_ASSERT (sgot != NULL);
            }

          if (h != NULL)
            {
              bfd_vma off;

              off = h->got_offset;
              BFD_ASSERT (off != (bfd_vma) -1);

              if (! elf_hash_table (info)->dynamic_sections_created)
                {
                  /* This is actually a static link.  We must
                     initialize this entry in the global offset table.
                     Since the offset must always be a multiple of 4,
                     we use the least significant bit to record
                     whether we have initialized it already.

                     When doing a dynamic link, we create a .rel.got
                     relocation entry to initialize the value.  This
                     is done in the finish_dynamic_symbol routine.  */
                  if ((off & 1) != 0)
                    off &= ~1;
                  else
                    {
                      bfd_put_32 (output_bfd, relocation,
                                  sgot->contents + off);
                      h->got_offset |= 1;
                    }
                }

              relocation = sgot->output_offset + off;
            }
          else
            {
              bfd_vma off;

              BFD_ASSERT (local_got_offsets != NULL
                          && local_got_offsets[r_symndx] != (bfd_vma) -1);

              off = local_got_offsets[r_symndx];

              /* The offset must always be a multiple of 4.  We use
                 the least significant bit to record whether we have
                 already generated the necessary reloc.  */
              if ((off & 1) != 0)
                off &= ~1;
              else
                {
                  bfd_put_32 (output_bfd, relocation, sgot->contents + off);

                  if (info->shared)
                    {
                      asection *srelgot;
                      Elf_Internal_Rel outrel;

                      srelgot = bfd_get_section_by_name (dynobj, ".rel.got");
                      BFD_ASSERT (srelgot != NULL);

                      outrel.r_offset = (sgot->output_section->vma
                                         + sgot->output_offset
                                         + off);
                      outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
                      bfd_elf32_swap_reloc_out (output_bfd, &outrel,
                                                (((Elf32_External_Rel *)
                                                  srelgot->contents)
                                                 + srelgot->reloc_count));
                      ++srelgot->reloc_count;
                    }

                  local_got_offsets[r_symndx] |= 1;
                }

              relocation = sgot->output_offset + off;
            }

          break;

        case R_386_GOTOFF:
          /* Relocation is relative to the start of the global offset
             table.  */

          if (sgot == NULL)
            {
              sgot = bfd_get_section_by_name (dynobj, ".got");
              BFD_ASSERT (sgot != NULL);
            }

          /* Note that sgot->output_offset is not involved in this
             calculation.  We always want the start of .got.  If we
             defined _GLOBAL_OFFSET_TABLE in a different way, as is
             permitted by the ABI, we might have to change this
             calculation.  */
          relocation -= sgot->output_section->vma;

          break;

        case R_386_GOTPC:
          /* Use global offset table as symbol value.  */

          if (sgot == NULL)
            {
              sgot = bfd_get_section_by_name (dynobj, ".got");
              BFD_ASSERT (sgot != NULL);
            }

          relocation = sgot->output_section->vma;

          break;

        case R_386_PLT32:
          /* Relocation is to the entry for this symbol in the
             procedure linkage table.  */

          /* Resolve a PLT32 reloc again a local symbol directly,
             without using the procedure linkage table.  */
          if (h == NULL)
            break;

          if (h->plt_offset == (bfd_vma) -1)
            {
              /* We didn't make a PLT entry for this symbol.  This
                 happens when statically linking PIC code.  */
              break;
            }

          if (splt == NULL)
            {
              splt = bfd_get_section_by_name (dynobj, ".plt");
              BFD_ASSERT (splt != NULL);
            }

          relocation = (splt->output_section->vma
                        + splt->output_offset
                        + h->plt_offset);

          break;

        case R_386_32:
        case R_386_PC32:
          if (info->shared
              && (input_section->flags & SEC_ALLOC) != 0)
            {
              Elf_Internal_Rel outrel;

              /* When generating a shared object, these relocations
                 are copied into the output file to be resolved at run
                 time.  */

              if (sreloc == NULL)
                {
                  const char *name;

                  name = (elf_string_from_elf_section
                          (input_bfd,
                           elf_elfheader (input_bfd)->e_shstrndx,
                           elf_section_data (input_section)->rel_hdr.sh_name));
                  if (name == NULL)
                    return false;

                  BFD_ASSERT (strncmp (name, ".rel", 4) == 0
                              && strcmp (bfd_get_section_name (input_bfd,
                                                               input_section),
                                         name + 4) == 0);

                  sreloc = bfd_get_section_by_name (dynobj, name);
                  BFD_ASSERT (sreloc != NULL);
                }

              outrel.r_offset = (rel->r_offset
                                 + input_section->output_section->vma
                                 + input_section->output_offset);
              if (r_type == R_386_PC32)
                {
                  BFD_ASSERT (h != NULL && h->dynindx != -1);
                  outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32);
                }
              else
                {
                  if (h == NULL)
                    outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
                  else
                    {
                      BFD_ASSERT (h->dynindx != (bfd_vma) -1);
                      outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_32);
                    }
                }

              bfd_elf32_swap_reloc_out (output_bfd, &outrel,
                                        (((Elf32_External_Rel *)
                                          sreloc->contents)
                                         + sreloc->reloc_count));
              ++sreloc->reloc_count;

              /* If this reloc is against an external symbol, we do
                 not want to fiddle with the addend.  Otherwise, we
                 need to include the symbol value so that it becomes
                 an addend for the dynamic reloc.  */
              if (h != NULL)
                continue;
            }

          break;

        default:
          break;
        }

      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
                                    contents, rel->r_offset,
                                    relocation, (bfd_vma) 0);

      if (r != bfd_reloc_ok)
        {
          switch (r)
            {
            default:
            case bfd_reloc_outofrange:
              abort ();
            case bfd_reloc_overflow:
              {
                const char *name;

                if (h != NULL)
                  name = h->root.root.string;
                else
                  {
                    name = elf_string_from_elf_section (input_bfd,
                                                        symtab_hdr->sh_link,
                                                        sym->st_name);
                    if (name == NULL)
                      return false;
                    if (*name == '\0')
                      name = bfd_section_name (input_bfd, sec);
                  }
                if (! ((*info->callbacks->reloc_overflow)
                       (info, name, howto->name, (bfd_vma) 0,
                        input_bfd, input_section, rel->r_offset)))
                  return false;
              }
              break;
            }
        }
    }

  return true;
}

/* Finish up dynamic symbol handling.  We set the contents of various
   dynamic sections here.  */

static boolean
elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym)
     bfd *output_bfd;
     struct bfd_link_info *info;
     struct elf_link_hash_entry *h;
     Elf_Internal_Sym *sym;
{
  bfd *dynobj;

  dynobj = elf_hash_table (info)->dynobj;

  if (h->plt_offset != (bfd_vma) -1)
    {
      asection *splt;
      asection *sgot;
      asection *srel;
      bfd_vma plt_index;
      bfd_vma got_offset;
      Elf_Internal_Rel rel;

      /* This symbol has an entry in the procedure linkage table.  Set
         it up.  */

      BFD_ASSERT (h->dynindx != -1);

      splt = bfd_get_section_by_name (dynobj, ".plt");
      sgot = bfd_get_section_by_name (dynobj, ".got.plt");
      srel = bfd_get_section_by_name (dynobj, ".rel.plt");
      BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL);

      /* Get the index in the procedure linkage table which
         corresponds to this symbol.  This is the index of this symbol
         in all the symbols for which we are making plt entries.  The
         first entry in the procedure linkage table is reserved.  */
      plt_index = h->plt_offset / PLT_ENTRY_SIZE - 1;

      /* Get the offset into the .got table of the entry that
         corresponds to this function.  Each .got entry is 4 bytes.
         The first three are reserved.  */
      got_offset = (plt_index + 3) * 4;

      /* Fill in the entry in the procedure linkage table.  */
      if (! info->shared)
        {
          memcpy (splt->contents + h->plt_offset, elf_i386_plt_entry,
                  PLT_ENTRY_SIZE);
          bfd_put_32 (output_bfd,
                      (sgot->output_section->vma
                       + sgot->output_offset
                       + got_offset),
                      splt->contents + h->plt_offset + 2);
        }
      else
        {
          memcpy (splt->contents + h->plt_offset, elf_i386_pic_plt_entry,
                  PLT_ENTRY_SIZE);
          bfd_put_32 (output_bfd, got_offset,
                      splt->contents + h->plt_offset + 2);
        }

      bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
                  splt->contents + h->plt_offset + 7);
      bfd_put_32 (output_bfd, - (h->plt_offset + PLT_ENTRY_SIZE),
                  splt->contents + h->plt_offset + 12);

      /* Fill in the entry in the global offset table.  */
      bfd_put_32 (output_bfd,
                  (splt->output_section->vma
                   + splt->output_offset
                   + h->plt_offset
                   + 6),
                  sgot->contents + got_offset);

      /* Fill in the entry in the .rel.plt section.  */
      rel.r_offset = (sgot->output_section->vma
                      + sgot->output_offset
                      + got_offset);
      rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
      bfd_elf32_swap_reloc_out (output_bfd, &rel,
                                ((Elf32_External_Rel *) srel->contents
                                 + plt_index));

      if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
        {
          /* Mark the symbol as undefined, rather than as defined in
             the .plt section.  Leave the value alone.  */
          sym->st_shndx = SHN_UNDEF;
        }
    }

  if (h->got_offset != (bfd_vma) -1)
    {
      asection *sgot;
      asection *srel;
      Elf_Internal_Rel rel;

      /* This symbol has an entry in the global offset table.  Set it
         up.  */
      
      BFD_ASSERT (h->dynindx != -1);

      sgot = bfd_get_section_by_name (dynobj, ".got");
      srel = bfd_get_section_by_name (dynobj, ".rel.got");
      BFD_ASSERT (sgot != NULL && srel != NULL);

      bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got_offset);

      rel.r_offset = (sgot->output_section->vma
                      + sgot->output_offset
                      + h->got_offset);
      rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
      bfd_elf32_swap_reloc_out (output_bfd, &rel,
                                ((Elf32_External_Rel *) srel->contents
                                 + srel->reloc_count));
      ++srel->reloc_count;
    }

  if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
    {
      asection *s;
      Elf_Internal_Rel rel;

      /* This symbol needs a copy reloc.  Set it up.  */

      BFD_ASSERT (h->dynindx != -1
                  && h->root.type == bfd_link_hash_defined);

      s = bfd_get_section_by_name (h->root.u.def.section->owner,
                                   ".rel.bss");
      BFD_ASSERT (s != NULL);

      rel.r_offset = (h->root.u.def.value
                      + h->root.u.def.section->output_section->vma
                      + h->root.u.def.section->output_offset);
      rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
      bfd_elf32_swap_reloc_out (output_bfd, &rel,
                                ((Elf32_External_Rel *) s->contents
                                 + s->reloc_count));
      ++s->reloc_count;
    }

  /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.  */
  if (strcmp (h->root.root.string, "_DYNAMIC") == 0
      || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
    sym->st_shndx = SHN_ABS;

  return true;
}

/* Finish up the dynamic sections.  */

static boolean
elf_i386_finish_dynamic_sections (output_bfd, info)
     bfd *output_bfd;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *sgot;
  asection *sdyn;

  dynobj = elf_hash_table (info)->dynobj;

  sgot = bfd_get_section_by_name (dynobj, ".got.plt");
  BFD_ASSERT (sgot != NULL);
  sdyn = bfd_get_section_by_name (dynobj, ".dynamic");

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      asection *splt;
      Elf32_External_Dyn *dyncon, *dynconend;

      splt = bfd_get_section_by_name (dynobj, ".plt");
      BFD_ASSERT (splt != NULL && sdyn != NULL);

      dyncon = (Elf32_External_Dyn *) sdyn->contents;
      dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
      for (; dyncon < dynconend; dyncon++)
        {
          Elf_Internal_Dyn dyn;
          const char *name;
          asection *s;

          bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);

          switch (dyn.d_tag)
            {
            default:
              break;

            case DT_PLTGOT:
              name = ".got";
              goto get_vma;
            case DT_JMPREL:
              name = ".rel.plt";
            get_vma:
              s = bfd_get_section_by_name (output_bfd, name);
              BFD_ASSERT (s != NULL);
              dyn.d_un.d_ptr = s->vma;
              bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
              break;

            case DT_PLTRELSZ:
              s = bfd_get_section_by_name (output_bfd, ".rel.plt");
              BFD_ASSERT (s != NULL);
              if (s->_cooked_size != 0)
                dyn.d_un.d_val = s->_cooked_size;
              else
                dyn.d_un.d_val = s->_raw_size;
              bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
              break;

            case DT_RELSZ:
              /* My reading of the SVR4 ABI indicates that the
                 procedure linkage table relocs (DT_JMPREL) should be
                 included in the overall relocs (DT_REL).  This is
                 what Solaris does.  However, UnixWare can not handle
                 that case.  Therefore, we override the DT_RELSZ entry
                 here to make it not include the JMPREL relocs.  Since
                 the linker script arranges for .rel.plt to follow all
                 other relocation sections, we don't have to worry
                 about changing the DT_REL entry.  */
              s = bfd_get_section_by_name (output_bfd, ".rel.plt");
              if (s != NULL)
                {
                  if (s->_cooked_size != 0)
                    dyn.d_un.d_val -= s->_cooked_size;
                  else
                    dyn.d_un.d_val -= s->_raw_size;
                }
              bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
              break;
            }
        }

      /* Fill in the first entry in the procedure linkage table.  */
      if (splt->_raw_size > 0)
        {
          if (info->shared)
            memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
          else
            {
              memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE);
              bfd_put_32 (output_bfd,
                          sgot->output_section->vma + sgot->output_offset + 4,
                          splt->contents + 2);
              bfd_put_32 (output_bfd,
                          sgot->output_section->vma + sgot->output_offset + 8,
                          splt->contents + 8);
            }
        }

      /* UnixWare sets the entsize of .plt to 4, although that doesn't
         really seem like the right value.  */
      elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
    }

  /* Fill in the first three entries in the global offset table.  */
  if (sgot->_raw_size > 0)
    {
      if (sdyn == NULL)
        bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
      else
        bfd_put_32 (output_bfd,
                    sdyn->output_section->vma + sdyn->output_offset,
                    sgot->contents);
      bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
      bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
    }

  elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;

  return true;
}

#define TARGET_LITTLE_SYM               bfd_elf32_i386_vec
#define TARGET_LITTLE_NAME              "elf32-i386"
#define ELF_ARCH                        bfd_arch_i386
#define ELF_MACHINE_CODE                EM_386
#define elf_info_to_howto               elf_i386_info_to_howto
#define elf_info_to_howto_rel           elf_i386_info_to_howto_rel
#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
#define ELF_MAXPAGESIZE                 0x1000
#define elf_backend_create_dynamic_sections \
                                        elf_i386_create_dynamic_sections
#define elf_backend_check_relocs        elf_i386_check_relocs
#define elf_backend_adjust_dynamic_symbol \
                                        elf_i386_adjust_dynamic_symbol
#define elf_backend_size_dynamic_sections \
                                        elf_i386_size_dynamic_sections
#define elf_backend_relocate_section    elf_i386_relocate_section
#define elf_backend_finish_dynamic_symbol \
                                        elf_i386_finish_dynamic_symbol
#define elf_backend_finish_dynamic_sections \
                                        elf_i386_finish_dynamic_sections

#include "elf32-target.h"