Support for Toshiba MeP and for complex relocations.

1 files changed, 940 insertions, 0 deletions

diff --git a/bfd/elf32-mep.c b/bfd/elf32-mep.c
new file mode 100644
index 0000000..4036d1e
--- /dev/null
+++ b/bfd/elf32-mep.c
@@ -0,0 +1,940 @@
+/* MeP-specific support for 32-bit ELF.
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/mep.h"
+#include "libiberty.h"
+
+/* Forward declarations.  */
+
+/* Private relocation functions.  */
+
+#define MEPREL(type, size, bits, right, left, pcrel, overflow, mask) \
+  {(unsigned)type, right, size, bits, pcrel, left, overflow, mep_reloc, #type, FALSE, 0, mask, 0 }
+
+#define N complain_overflow_dont
+#define S complain_overflow_signed
+#define U complain_overflow_unsigned
+
+static bfd_reloc_status_type mep_reloc (bfd *, arelent *, struct bfd_symbol *,
+					void *, asection *, bfd *, char **);
+
+static reloc_howto_type mep_elf_howto_table [] =
+{
+  /* type, size, bits, leftshift, rightshift, pcrel, OD/OS/OU, mask.  */
+  MEPREL (R_MEP_NONE,     0,  0, 0, 0, 0, N, 0),
+  MEPREL (R_RELC,         0,  0, 0, 0, 0, N, 0),
+  /* MEPRELOC:HOWTO */
+    /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
+  MEPREL (R_MEP_8,        0,  8, 0, 0, 0, U, 0xff),
+  MEPREL (R_MEP_16,       1, 16, 0, 0, 0, U, 0xffff),
+  MEPREL (R_MEP_32,       2, 32, 0, 0, 0, U, 0xffffffff),
+  MEPREL (R_MEP_PCREL8A2, 1,  8, 1, 1, 1, S, 0x00fe),
+  MEPREL (R_MEP_PCREL12A2,1, 12, 1, 1, 1, S, 0x0ffe),
+  MEPREL (R_MEP_PCREL17A2,2, 17, 0, 1, 1, S, 0x0000ffff),
+  MEPREL (R_MEP_PCREL24A2,2, 24, 0, 1, 1, S, 0x07f0ffff),
+  MEPREL (R_MEP_PCABS24A2,2, 24, 0, 1, 0, U, 0x07f0ffff),
+  MEPREL (R_MEP_LOW16,    2, 16, 0, 0, 0, N, 0x0000ffff),
+  MEPREL (R_MEP_HI16U,    2, 32, 0,16, 0, N, 0x0000ffff),
+  MEPREL (R_MEP_HI16S,    2, 32, 0,16, 0, N, 0x0000ffff),
+  MEPREL (R_MEP_GPREL,    2, 16, 0, 0, 0, S, 0x0000ffff),
+  MEPREL (R_MEP_TPREL,    2, 16, 0, 0, 0, S, 0x0000ffff),
+  MEPREL (R_MEP_TPREL7,   1,  7, 0, 0, 0, U, 0x007f),
+  MEPREL (R_MEP_TPREL7A2, 1,  7, 1, 1, 0, U, 0x007e),
+  MEPREL (R_MEP_TPREL7A4, 1,  7, 2, 2, 0, U, 0x007c),
+  MEPREL (R_MEP_UIMM24,   2, 24, 0, 0, 0, U, 0x00ffffff),
+  MEPREL (R_MEP_ADDR24A4, 2, 24, 0, 2, 0, U, 0x00fcffff),
+  MEPREL (R_MEP_GNU_VTINHERIT,1,  0,16,32, 0, N, 0x0000),
+  MEPREL (R_MEP_GNU_VTENTRY,1,  0,16,32, 0, N, 0x0000),
+  /* MEPRELOC:END */
+};
+
+#define VALID_MEP_RELOC(N) ((N) >= 0 \
+  && (N) < ARRAY_SIZE (mep_elf_howto_table)
+
+#undef N
+#undef S
+#undef U
+
+static bfd_reloc_status_type
+mep_reloc
+    (bfd *               abfd ATTRIBUTE_UNUSED,
+     arelent *           reloc_entry ATTRIBUTE_UNUSED,
+     struct bfd_symbol * symbol ATTRIBUTE_UNUSED,
+     void *              data ATTRIBUTE_UNUSED,
+     asection *          input_section ATTRIBUTE_UNUSED,
+     bfd *               output_bfd ATTRIBUTE_UNUSED,
+     char **             error_message ATTRIBUTE_UNUSED)
+{
+  return bfd_reloc_ok;
+}
+
+
+
+#define BFD_RELOC_MEP_NONE BFD_RELOC_NONE
+#if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
+#define MAP(n) case BFD_RELOC_MEP_##n: type = R_MEP_##n; break
+#else
+#define MAP(n) case BFD_RELOC_MEP_/**/n: type = R_MEP_/**/n; break
+#endif
+
+static reloc_howto_type *
+mep_reloc_type_lookup
+    (bfd * abfd ATTRIBUTE_UNUSED,
+     bfd_reloc_code_real_type code)
+{
+  unsigned int type = 0;
+
+  switch (code)
+    {
+    MAP(NONE);
+    case BFD_RELOC_8:
+      type = R_MEP_8;
+      break;
+    case BFD_RELOC_16:
+      type = R_MEP_16;
+      break;
+    case BFD_RELOC_32:
+      type = R_MEP_32;
+      break;
+    case BFD_RELOC_VTABLE_ENTRY:
+      type = R_MEP_GNU_VTENTRY;
+      break;
+    case BFD_RELOC_VTABLE_INHERIT:
+      type = R_MEP_GNU_VTINHERIT;
+      break;
+    case BFD_RELOC_RELC:
+      type = R_RELC;
+      break;
+
+    /* MEPRELOC:MAP */
+    /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
+    MAP(8);
+    MAP(16);
+    MAP(32);
+    MAP(PCREL8A2);
+    MAP(PCREL12A2);
+    MAP(PCREL17A2);
+    MAP(PCREL24A2);
+    MAP(PCABS24A2);
+    MAP(LOW16);
+    MAP(HI16U);
+    MAP(HI16S);
+    MAP(GPREL);
+    MAP(TPREL);
+    MAP(TPREL7);
+    MAP(TPREL7A2);
+    MAP(TPREL7A4);
+    MAP(UIMM24);
+    MAP(ADDR24A4);
+    MAP(GNU_VTINHERIT);
+    MAP(GNU_VTENTRY);
+    /* MEPRELOC:END */
+
+    default:
+      /* Pacify gcc -Wall.  */
+      fprintf (stderr, "mep: no reloc for code %d\n", code);
+      return NULL;
+    }
+
+  if (mep_elf_howto_table[type].type != type)
+    {
+      fprintf (stderr, "MeP: howto %d has type %d\n", type, mep_elf_howto_table[type].type);
+      abort ();
+    }
+
+  return mep_elf_howto_table + type;
+}
+
+#undef MAP
+
+
+/* Perform a single relocation.  */
+
+static struct bfd_link_info *mep_info;
+static int warn_tp = 0, warn_sda = 0;
+
+static bfd_vma
+mep_lookup_global
+    (char *    name,
+     bfd_vma   ofs,
+     bfd_vma * cache,
+     int *     warn)
+{
+  struct bfd_link_hash_entry *h;
+
+  if (*cache || *warn)
+    return *cache;
+
+  h = bfd_link_hash_lookup (mep_info->hash, name, FALSE, FALSE, TRUE);
+  if (h == 0 || h->type != bfd_link_hash_defined)
+    {
+      *warn = ofs + 1;
+      return 0;
+    }
+  *cache = (h->u.def.value
+	  + h->u.def.section->output_section->vma
+	  + h->u.def.section->output_offset);
+  return *cache;
+}
+
+static bfd_vma
+mep_tpoff_base (bfd_vma ofs)
+{
+  static bfd_vma cache = 0;
+  return mep_lookup_global ("__tpbase", ofs, &cache, &warn_tp);
+}
+
+static bfd_vma
+mep_sdaoff_base (bfd_vma ofs)
+{
+  static bfd_vma cache = 0;
+  return mep_lookup_global ("__sdabase", ofs, &cache, &warn_sda);
+}
+
+static bfd_reloc_status_type
+mep_final_link_relocate
+    (reloc_howto_type *  howto,
+     bfd *               input_bfd,
+     asection *          input_section,
+     bfd_byte *          contents,
+     Elf_Internal_Rela * rel,
+     bfd_vma             relocation)
+{
+  unsigned long u;
+  long s;
+  unsigned char *byte;
+  bfd_vma pc;
+  bfd_reloc_status_type r = bfd_reloc_ok;
+  int e2, e4;
+
+  if (bfd_big_endian (input_bfd))
+    {
+      e2 = 0;
+      e4 = 0;
+    }
+  else
+    {
+      e2 = 1;
+      e4 = 3;
+    }
+
+  pc = (input_section->output_section->vma
+	+ input_section->output_offset
+	+ rel->r_offset);
+
+  s = relocation + rel->r_addend;
+
+  byte = (unsigned char *)contents + rel->r_offset;
+
+  if (howto->type == R_MEP_PCREL24A2
+      && s == 0
+      && pc >= 0x800000)
+    {
+      /* This is an unreachable branch to an undefined weak function.
+	 Silently ignore it, since the opcode can't do that but should
+	 never be executed anyway.  */
+      return bfd_reloc_ok;
+    }
+
+  if (howto->pc_relative)
+    s -= pc;
+
+  u = (unsigned long) s;
+
+  switch (howto->type)
+    {
+    /* MEPRELOC:APPLY */
+    /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
+    case R_MEP_8: /* 76543210 */
+      if (u > 255) r = bfd_reloc_overflow;
+      byte[0] = (u & 0xff);
+      break;
+    case R_MEP_16: /* fedcba9876543210 */
+      if (u > 65535) r = bfd_reloc_overflow;
+      byte[0^e2] = ((u >> 8) & 0xff);
+      byte[1^e2] = (u & 0xff);
+      break;
+    case R_MEP_32: /* vutsrqponmlkjihgfedcba9876543210 */
+      byte[0^e4] = ((u >> 24) & 0xff);
+      byte[1^e4] = ((u >> 16) & 0xff);
+      byte[2^e4] = ((u >> 8) & 0xff);
+      byte[3^e4] = (u & 0xff);
+      break;
+    case R_MEP_PCREL8A2: /* --------7654321- */
+      if (-128 > s || s > 127) r = bfd_reloc_overflow;
+      byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
+      break;
+    case R_MEP_PCREL12A2: /* ----ba987654321- */
+      if (-2048 > s || s > 2047) r = bfd_reloc_overflow;
+      byte[0^e2] = (byte[0^e2] & 0xf0) | ((s >> 8) & 0x0f);
+      byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
+      break;
+    case R_MEP_PCREL17A2: /* ----------------gfedcba987654321 */
+      if (-65536 > s || s > 65535) r = bfd_reloc_overflow;
+      byte[2^e2] = ((s >> 9) & 0xff);
+      byte[3^e2] = ((s >> 1) & 0xff);
+      break;
+    case R_MEP_PCREL24A2: /* -----7654321----nmlkjihgfedcba98 */
+      if (-8388608 > s || s > 8388607) r = bfd_reloc_overflow;
+      byte[0^e2] = (byte[0^e2] & 0xf8) | ((s >> 5) & 0x07);
+      byte[1^e2] = (byte[1^e2] & 0x0f) | ((s << 3) & 0xf0);
+      byte[2^e2] = ((s >> 16) & 0xff);
+      byte[3^e2] = ((s >> 8) & 0xff);
+      break;
+    case R_MEP_PCABS24A2: /* -----7654321----nmlkjihgfedcba98 */
+      if (u > 16777215) r = bfd_reloc_overflow;
+      byte[0^e2] = (byte[0^e2] & 0xf8) | ((u >> 5) & 0x07);
+      byte[1^e2] = (byte[1^e2] & 0x0f) | ((u << 3) & 0xf0);
+      byte[2^e2] = ((u >> 16) & 0xff);
+      byte[3^e2] = ((u >> 8) & 0xff);
+      break;
+    case R_MEP_LOW16: /* ----------------fedcba9876543210 */
+      byte[2^e2] = ((u >> 8) & 0xff);
+      byte[3^e2] = (u & 0xff);
+      break;
+    case R_MEP_HI16U: /* ----------------vutsrqponmlkjihg */
+      byte[2^e2] = ((u >> 24) & 0xff);
+      byte[3^e2] = ((u >> 16) & 0xff);
+      break;
+    case R_MEP_HI16S: /* ----------------vutsrqponmlkjihg */
+      byte[2^e2] = ((s >> 24) & 0xff);
+      byte[3^e2] = ((s >> 16) & 0xff);
+      break;
+    case R_MEP_GPREL: /* ----------------fedcba9876543210 */
+      s -= mep_sdaoff_base(rel->r_offset);
+      if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
+      byte[2^e2] = ((s >> 8) & 0xff);
+      byte[3^e2] = (s & 0xff);
+      break;
+    case R_MEP_TPREL: /* ----------------fedcba9876543210 */
+      s -= mep_tpoff_base(rel->r_offset);
+      if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
+      byte[2^e2] = ((s >> 8) & 0xff);
+      byte[3^e2] = (s & 0xff);
+      break;
+    case R_MEP_TPREL7: /* ---------6543210 */
+      u -= mep_tpoff_base(rel->r_offset);
+      if (u > 127) r = bfd_reloc_overflow;
+      byte[1^e2] = (byte[1^e2] & 0x80) | (u & 0x7f);
+      break;
+    case R_MEP_TPREL7A2: /* ---------654321- */
+      u -= mep_tpoff_base(rel->r_offset);
+      if (u > 127) r = bfd_reloc_overflow;
+      byte[1^e2] = (byte[1^e2] & 0x81) | (u & 0x7e);
+      break;
+    case R_MEP_TPREL7A4: /* ---------65432-- */
+      u -= mep_tpoff_base(rel->r_offset);
+      if (u > 127) r = bfd_reloc_overflow;
+      byte[1^e2] = (byte[1^e2] & 0x83) | (u & 0x7c);
+      break;
+    case R_MEP_UIMM24: /* --------76543210nmlkjihgfedcba98 */
+      if (u > 16777215) r = bfd_reloc_overflow;
+      byte[1^e2] = (u & 0xff);
+      byte[2^e2] = ((u >> 16) & 0xff);
+      byte[3^e2] = ((u >> 8) & 0xff);
+      break;
+    case R_MEP_ADDR24A4: /* --------765432--nmlkjihgfedcba98 */
+      if (u > 16777215) r = bfd_reloc_overflow;
+      byte[1^e2] = (byte[1^e2] & 0x03) | (u & 0xfc);
+      byte[2^e2] = ((u >> 16) & 0xff);
+      byte[3^e2] = ((u >> 8) & 0xff);
+      break;
+    case R_MEP_GNU_VTINHERIT: /* ---------------- */
+      break;
+    case R_MEP_GNU_VTENTRY: /* ---------------- */
+      break;
+    /* MEPRELOC:END */
+    default:
+      abort ();
+    }
+
+  return r;
+}
+
+/* Set the howto pointer for a MEP ELF reloc.  */
+
+static void
+mep_info_to_howto_rela
+    (bfd *               abfd ATTRIBUTE_UNUSED,
+     arelent *           cache_ptr,
+     Elf_Internal_Rela * dst)
+{
+  unsigned int r_type;
+
+  r_type = ELF32_R_TYPE (dst->r_info);
+  cache_ptr->howto = & mep_elf_howto_table [r_type];
+}
+
+/* Look through the relocs for a section during the first phase.
+   Since we don't do .gots or .plts, we just need to consider the
+   virtual table relocs for gc.  */
+
+static bfd_boolean
+mep_elf_check_relocs
+    (bfd *                     abfd,
+     struct bfd_link_info *    info,
+     asection *                sec,
+     const Elf_Internal_Rela * relocs)
+{
+  Elf_Internal_Shdr *           symtab_hdr;
+  struct elf_link_hash_entry ** sym_hashes;
+  struct elf_link_hash_entry ** sym_hashes_end;
+  const Elf_Internal_Rela *     rel;
+  const Elf_Internal_Rela *     rel_end;
+
+  if (info->relocatable)
+    return TRUE;
+
+  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+  sym_hashes = elf_sym_hashes (abfd);
+  sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
+  if (!elf_bad_symtab (abfd))
+    sym_hashes_end -= symtab_hdr->sh_info;
+
+  rel_end = relocs + sec->reloc_count;
+  for (rel = relocs; rel < rel_end; rel++)
+    {
+      struct elf_link_hash_entry *h;
+      unsigned long r_symndx;
+
+      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];
+    }
+  return TRUE;
+}
+
+
+/* Relocate a MEP ELF section.
+   There is some attempt to make this function usable for many architectures,
+   both USE_REL and USE_RELA ['twould be nice if such a critter existed],
+   if only to serve as a learning tool.
+
+   The RELOCATE_SECTION function is called by the new ELF backend linker
+   to handle the relocations for a section.
+
+   The relocs are always passed as Rela structures; if the section
+   actually uses Rel structures, the r_addend field will always be
+   zero.
+
+   This function is responsible for adjusting the section contents as
+   necessary, and (if using Rela relocs and generating a relocatable
+   output file) adjusting the reloc addend as necessary.
+
+   This function does not have to worry about setting the reloc
+   address or the reloc symbol index.
+
+   LOCAL_SYMS is a pointer to the swapped in local symbols.
+
+   LOCAL_SECTIONS is an array giving the section in the input file
+   corresponding to the st_shndx field of each local symbol.
+
+   The global hash table entry for the global symbols can be found
+   via elf_sym_hashes (input_bfd).
+
+   When generating relocatable output, this function must handle
+   STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
+   going to be the section symbol corresponding to the output
+   section, which means that the addend must be adjusted
+   accordingly.  */
+
+static bfd_boolean
+mep_elf_relocate_section
+    (bfd *                   output_bfd ATTRIBUTE_UNUSED,
+     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)
+{
+  Elf_Internal_Shdr *           symtab_hdr;
+  struct elf_link_hash_entry ** sym_hashes;
+  Elf_Internal_Rela *           rel;
+  Elf_Internal_Rela *           relend;
+
+  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
+  sym_hashes = elf_sym_hashes (input_bfd);
+  relend     = relocs + input_section->reloc_count;
+
+  mep_info = info;
+
+  for (rel = relocs; rel < relend; rel ++)
+    {
+      reloc_howto_type *           howto;
+      unsigned long                r_symndx;
+      Elf_Internal_Sym *           sym;
+      asection *                   sec;
+      struct elf_link_hash_entry * h;
+      bfd_vma                      relocation;
+      bfd_reloc_status_type        r;
+      const char *                 name = NULL;
+      int                          r_type;
+
+      r_type = ELF32_R_TYPE (rel->r_info);
+
+      r_symndx = ELF32_R_SYM (rel->r_info);
+
+      if (info->relocatable)
+	{
+	  /* This is a relocatable 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)
+		{
+		  sec = local_sections [r_symndx];
+		  rel->r_addend += sec->output_offset + sym->st_value;
+		}
+	    }
+
+	  continue;
+	}
+
+      /* Is this a complex relocation?  */
+      if (ELF32_R_TYPE (rel->r_info) == R_RELC)
+	{
+	  bfd_elf_perform_complex_relocation (output_bfd, info,
+					      input_bfd, input_section, contents,
+					      rel, local_syms, local_sections);
+	  continue;
+	}
+
+      /* This is a final link.  */
+      howto  = mep_elf_howto_table + ELF32_R_TYPE (rel->r_info);
+      h      = NULL;
+      sym    = NULL;
+      sec    = NULL;
+
+      if (r_symndx < symtab_hdr->sh_info)
+	{
+	  sym = local_syms + r_symndx;
+	  sec = local_sections [r_symndx];
+	  relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
+
+	  name = bfd_elf_string_from_elf_section
+	    (input_bfd, symtab_hdr->sh_link, sym->st_name);
+	  name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
+#if 0
+	  fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n",
+		   sec->name, name, sym->st_name,
+		   sec->output_section->vma, sec->output_offset,
+		   sym->st_value, rel->r_addend);
+#endif
+	}
+      else
+	{
+	  h = sym_hashes [r_symndx];
+
+	  while (h->root.type == bfd_link_hash_indirect
+		 || h->root.type == bfd_link_hash_warning)
+	    h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+	  name = h->root.root.string;
+
+	  if (h->root.type == bfd_link_hash_defined
+	      || h->root.type == bfd_link_hash_defweak)
+	    {
+	      sec = h->root.u.def.section;
+	      relocation = (h->root.u.def.value
+			    + sec->output_section->vma
+			    + sec->output_offset);
+#if 0
+	      fprintf (stderr,
+		       "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n",
+		       sec->name, name, h->root.u.def.value,
+		       sec->output_section->vma, sec->output_offset, relocation);
+#endif
+	    }
+	  else if (h->root.type == bfd_link_hash_undefweak)
+	    {
+#if 0
+	      fprintf (stderr, "undefined: sec: %s, name: %s\n",
+		       sec->name, name);
+#endif
+	      relocation = 0;
+	    }
+	  else
+	    {
+	      if (! ((*info->callbacks->undefined_symbol)
+		     (info, h->root.root.string, input_bfd,
+		      input_section, rel->r_offset,
+		      (!info->shared && info->unresolved_syms_in_objects == RM_GENERATE_ERROR))))
+		return FALSE;
+#if 0
+	      fprintf (stderr, "unknown: name: %s\n", name);
+#endif
+	      relocation = 0;
+	    }
+	}
+
+      switch (r_type)
+	{
+	default:
+	  r = mep_final_link_relocate (howto, input_bfd, input_section,
+					 contents, rel, relocation);
+	  break;
+	}
+
+      if (r != bfd_reloc_ok)
+	{
+	  const char * msg = (const char *) NULL;
+
+	  switch (r)
+	    {
+	    case bfd_reloc_overflow:
+	      r = info->callbacks->reloc_overflow
+		(info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
+		 input_bfd, input_section, rel->r_offset);
+	      break;
+
+	    case bfd_reloc_undefined:
+	      r = info->callbacks->undefined_symbol
+		(info, name, input_bfd, input_section, rel->r_offset, TRUE);
+	      break;
+
+	    case bfd_reloc_outofrange:
+	      msg = _("internal error: out of range error");
+	      break;
+
+	    case bfd_reloc_notsupported:
+	      msg = _("internal error: unsupported relocation error");
+	      break;
+
+	    case bfd_reloc_dangerous:
+	      msg = _("internal error: dangerous relocation");
+	      break;
+
+	    default:
+	      msg = _("internal error: unknown error");
+	      break;
+	    }
+
+	  if (msg)
+	    r = info->callbacks->warning
+	      (info, msg, name, input_bfd, input_section, rel->r_offset);
+
+	  if (! r)
+	    return FALSE;
+	}
+    }
+
+  if (warn_tp)
+    info->callbacks->undefined_symbol
+      (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE);
+  if (warn_sda)
+    info->callbacks->undefined_symbol
+      (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE);
+  if (warn_sda || warn_tp)
+    return FALSE;
+
+  return TRUE;
+}
+
+
+/* Update the got entry reference counts for the section being
+   removed.  */
+
+static bfd_boolean
+mep_elf_gc_sweep_hook
+    (bfd *                     abfd ATTRIBUTE_UNUSED,
+     struct bfd_link_info *    info ATTRIBUTE_UNUSED,
+     asection *                sec ATTRIBUTE_UNUSED,
+     const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
+{
+  return TRUE;
+}
+
+/* Return the section that should be marked against GC for a given
+   relocation.  */
+
+static asection *
+mep_elf_gc_mark_hook
+    (asection *                   sec,
+     struct bfd_link_info *       info ATTRIBUTE_UNUSED,
+     Elf_Internal_Rela *          rel,
+     struct elf_link_hash_entry * h,
+     Elf_Internal_Sym *           sym)
+{
+  if (h != NULL)
+    {
+      switch (ELF32_R_TYPE (rel->r_info))
+	{
+	default:
+	  switch (h->root.type)
+	    {
+	    case bfd_link_hash_defined:
+	    case bfd_link_hash_defweak:
+	      return h->root.u.def.section;
+
+	    case bfd_link_hash_common:
+	      return h->root.u.c.p->section;
+
+	    default:
+	      break;
+	    }
+	}
+    }
+  else
+    {
+      if (!(elf_bad_symtab (sec->owner)
+	    && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
+	  && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
+		&& sym->st_shndx != SHN_COMMON))
+	return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
+    }
+
+  return NULL;
+}
+
+
+/* Function to set the ELF flag bits.  */
+
+static bfd_boolean
+mep_elf_set_private_flags (bfd *    abfd,
+			   flagword flags)
+{
+  elf_elfheader (abfd)->e_flags = flags;
+  elf_flags_init (abfd) = TRUE;
+  return TRUE;
+}
+
+static bfd_boolean
+mep_elf_copy_private_bfd_data (bfd * ibfd, bfd * obfd)
+{
+  if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
+      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
+    return TRUE;
+
+  elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
+  elf_flags_init (obfd) = TRUE;
+  return TRUE;
+}
+
+/* Merge backend specific data from an object file to the output
+   object file when linking.  */
+
+static bfd_boolean
+mep_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
+{
+  static bfd *last_ibfd = 0;
+  flagword old_flags, new_flags;
+  flagword old_partial, new_partial;
+
+  /* Check if we have the same endianess.  */
+  if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE)
+    return FALSE;
+
+  new_flags = elf_elfheader (ibfd)->e_flags;
+  old_flags = elf_elfheader (obfd)->e_flags;
+
+#ifdef DEBUG
+  _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s",
+		      ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
+#endif
+
+    /* First call, no flags set.  */
+    if (!elf_flags_init (obfd))
+    {
+      elf_flags_init (obfd) = TRUE;
+      old_flags = new_flags;
+    }
+  else if ((new_flags | old_flags) & EF_MEP_LIBRARY)
+    {
+      /* Non-library flags trump library flags.  The choice doesn't really
+	 matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set.  */
+      if (old_flags & EF_MEP_LIBRARY)
+	old_flags = new_flags;
+    }
+  else
+    {
+      /* Make sure they're for the same mach.  Allow upgrade from the "mep"
+	 mach.  */
+      new_partial = (new_flags & EF_MEP_CPU_MASK);
+      old_partial = (old_flags & EF_MEP_CPU_MASK);
+      if (new_partial == old_partial)
+	;
+      else if (new_partial == EF_MEP_CPU_MEP)
+	;
+      else if (old_partial == EF_MEP_CPU_MEP)
+	old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial;
+      else
+	{
+	  _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd);
+	  bfd_set_error (bfd_error_invalid_target);
+	  return FALSE;
+	}
+
+      /* Make sure they're for the same me_module.  Allow basic config to
+	 mix with any other.  */
+      new_partial = (new_flags & EF_MEP_INDEX_MASK);
+      old_partial = (old_flags & EF_MEP_INDEX_MASK);
+      if (new_partial == old_partial)
+	;
+      else if (new_partial == 0)
+	;
+      else if (old_partial == 0)
+	old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial;
+      else
+	{
+	  _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd);
+	  bfd_set_error (bfd_error_invalid_target);
+	  return FALSE;
+	}
+    }
+
+  elf_elfheader (obfd)->e_flags = old_flags;
+  last_ibfd = ibfd;
+  return TRUE;
+}
+
+/* This will be edited by the MeP configration tool.  */
+static const char * config_names[] =
+{
+  "basic"
+  /* start-mepcfgtool */
+  ,"simple"
+  ,"fmax"
+  /* end-mepcfgtool */
+};
+
+static const char * core_names[] =
+{
+  "MeP", "MeP-c2", "MeP-c3", "MeP-h1"
+};
+
+static bfd_boolean
+mep_elf_print_private_bfd_data (bfd * abfd, void * ptr)
+{
+  FILE *   file = (FILE *) ptr;
+  flagword flags, partial_flags;
+
+  BFD_ASSERT (abfd != NULL && ptr != NULL);
+
+  /* Print normal ELF private data.  */
+  _bfd_elf_print_private_bfd_data (abfd, ptr);
+
+  flags = elf_elfheader (abfd)->e_flags;
+  fprintf (file, _("private flags = 0x%lx"), (long)flags);
+
+  partial_flags = (flags & EF_MEP_CPU_MASK) >> 24;
+  if (partial_flags < ARRAY_SIZE (core_names))
+    fprintf (file, "  core: %s", core_names[(long)partial_flags]);
+
+  partial_flags = flags & EF_MEP_INDEX_MASK;
+  if (partial_flags < ARRAY_SIZE (config_names))
+    fprintf (file, "  me_module: %s", config_names[(long)partial_flags]);
+
+  fputc ('\n', file);
+
+  return TRUE;
+}
+
+/* Return the machine subcode from the ELF e_flags header.  */
+
+static int
+elf32_mep_machine (bfd * abfd)
+{
+  switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK)
+    {
+    default: break;
+    case EF_MEP_CPU_C2: return bfd_mach_mep;
+    case EF_MEP_CPU_C3: return bfd_mach_mep;
+    case EF_MEP_CPU_C4: return bfd_mach_mep;
+    case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
+    }
+
+  return bfd_mach_mep;
+}
+
+static bfd_boolean
+mep_elf_object_p (bfd * abfd)
+{
+  /* Irix 5 and 6 is broken.  Object file symbol tables are not always
+     sorted correctly such that local symbols preceed global symbols,
+     and the sh_info field in the symbol table is not always right.  */
+  /* This is needed for the RELC support code.  */
+  elf_bad_symtab (abfd) = TRUE;
+  bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd));
+  return TRUE;
+}
+
+static bfd_boolean
+mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr)
+{
+  if (hdr->sh_flags & SHF_MEP_VLIW)
+    * flags |= SEC_MEP_VLIW;
+  return TRUE;
+}
+
+static bfd_boolean
+mep_elf_fake_sections (bfd *               abfd ATTRIBUTE_UNUSED,
+		       Elf_Internal_Shdr * hdr,
+		       asection *          sec)
+{
+  if (sec->flags & SEC_MEP_VLIW)
+    hdr->sh_flags |= SHF_MEP_VLIW;
+  return TRUE;
+}
+
+
+#define ELF_ARCH		bfd_arch_mep
+#define ELF_MACHINE_CODE	EM_CYGNUS_MEP
+#define ELF_MAXPAGESIZE		0x1000
+
+#define TARGET_BIG_SYM		bfd_elf32_mep_vec
+#define TARGET_BIG_NAME		"elf32-mep"
+
+#define TARGET_LITTLE_SYM	bfd_elf32_mep_little_vec
+#define TARGET_LITTLE_NAME	"elf32-mep-little"
+
+#define elf_info_to_howto_rel			NULL
+#define elf_info_to_howto			mep_info_to_howto_rela
+#define elf_backend_relocate_section		mep_elf_relocate_section
+#define elf_backend_gc_mark_hook		mep_elf_gc_mark_hook
+#define elf_backend_gc_sweep_hook		mep_elf_gc_sweep_hook
+#define elf_backend_check_relocs                mep_elf_check_relocs
+#define elf_backend_object_p		        mep_elf_object_p
+#define elf_backend_section_flags		mep_elf_section_flags
+#define elf_backend_fake_sections		mep_elf_fake_sections
+
+#define elf_backend_can_gc_sections		1
+
+#define bfd_elf32_bfd_reloc_type_lookup		mep_reloc_type_lookup
+#define bfd_elf32_bfd_set_private_flags		mep_elf_set_private_flags
+#define bfd_elf32_bfd_copy_private_bfd_data	mep_elf_copy_private_bfd_data
+#define bfd_elf32_bfd_merge_private_bfd_data	mep_elf_merge_private_bfd_data
+#define bfd_elf32_bfd_print_private_bfd_data	mep_elf_print_private_bfd_data
+
+/* We use only the RELA entries.  */
+#define USE_RELA
+
+#include "elf32-target.h"