bfd/elf32-mep.c

   1 /* MeP-specific support for 32-bit ELF.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "bfd.h"
  23 #include "libbfd.h"
  24 #include "elf-bfd.h"
  25 #include "elf/mep.h"
  26 #include "libiberty.h"
  27
  28 /* Forward declarations.  */
  29
  30 /* Private relocation functions.  */
  31 \f
  32 #define MEPREL(type, size, bits, right, left, pcrel, overflow, mask) \
  33   {(unsigned)type, right, size, bits, pcrel, left, overflow, mep_reloc, #type, FALSE, 0, mask, 0 }
  34
  35 #define N complain_overflow_dont
  36 #define S complain_overflow_signed
  37 #define U complain_overflow_unsigned
  38
  39 static bfd_reloc_status_type mep_reloc (bfd *, arelent *, struct bfd_symbol *,
  40                                         void *, asection *, bfd *, char **);
  41
  42 static reloc_howto_type mep_elf_howto_table [] =
  43 {
  44   /* type, size, bits, leftshift, rightshift, pcrel, OD/OS/OU, mask.  */
  45   MEPREL (R_MEP_NONE,     0,  0, 0, 0, 0, N, 0),
  46   MEPREL (R_RELC,         0,  0, 0, 0, 0, N, 0),
  47   /* MEPRELOC:HOWTO */
  48     /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
  49   MEPREL (R_MEP_8,        0,  8, 0, 0, 0, U, 0xff),
  50   MEPREL (R_MEP_16,       1, 16, 0, 0, 0, U, 0xffff),
  51   MEPREL (R_MEP_32,       2, 32, 0, 0, 0, U, 0xffffffff),
  52   MEPREL (R_MEP_PCREL8A2, 1,  8, 1, 1, 1, S, 0x00fe),
  53   MEPREL (R_MEP_PCREL12A2,1, 12, 1, 1, 1, S, 0x0ffe),
  54   MEPREL (R_MEP_PCREL17A2,2, 17, 0, 1, 1, S, 0x0000ffff),
  55   MEPREL (R_MEP_PCREL24A2,2, 24, 0, 1, 1, S, 0x07f0ffff),
  56   MEPREL (R_MEP_PCABS24A2,2, 24, 0, 1, 0, U, 0x07f0ffff),
  57   MEPREL (R_MEP_LOW16,    2, 16, 0, 0, 0, N, 0x0000ffff),
  58   MEPREL (R_MEP_HI16U,    2, 32, 0,16, 0, N, 0x0000ffff),
  59   MEPREL (R_MEP_HI16S,    2, 32, 0,16, 0, N, 0x0000ffff),
  60   MEPREL (R_MEP_GPREL,    2, 16, 0, 0, 0, S, 0x0000ffff),
  61   MEPREL (R_MEP_TPREL,    2, 16, 0, 0, 0, S, 0x0000ffff),
  62   MEPREL (R_MEP_TPREL7,   1,  7, 0, 0, 0, U, 0x007f),
  63   MEPREL (R_MEP_TPREL7A2, 1,  7, 1, 1, 0, U, 0x007e),
  64   MEPREL (R_MEP_TPREL7A4, 1,  7, 2, 2, 0, U, 0x007c),
  65   MEPREL (R_MEP_UIMM24,   2, 24, 0, 0, 0, U, 0x00ffffff),
  66   MEPREL (R_MEP_ADDR24A4, 2, 24, 0, 2, 0, U, 0x00fcffff),
  67   MEPREL (R_MEP_GNU_VTINHERIT,1,  0,16,32, 0, N, 0x0000),
  68   MEPREL (R_MEP_GNU_VTENTRY,1,  0,16,32, 0, N, 0x0000),
  69   /* MEPRELOC:END */
  70 };
  71
  72 #define VALID_MEP_RELOC(N) ((N) >= 0 \
  73   && (N) < ARRAY_SIZE (mep_elf_howto_table)
  74
  75 #undef N
  76 #undef S
  77 #undef U
  78
  79 static bfd_reloc_status_type
  80 mep_reloc
  81     (bfd *               abfd ATTRIBUTE_UNUSED,
  82      arelent *           reloc_entry ATTRIBUTE_UNUSED,
  83      struct bfd_symbol * symbol ATTRIBUTE_UNUSED,
  84      void *              data ATTRIBUTE_UNUSED,
  85      asection *          input_section ATTRIBUTE_UNUSED,
  86      bfd *               output_bfd ATTRIBUTE_UNUSED,
  87      char **             error_message ATTRIBUTE_UNUSED)
  88 {
  89   return bfd_reloc_ok;
  90 }
  91
  92 \f
  93
  94 #define BFD_RELOC_MEP_NONE BFD_RELOC_NONE
  95 #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
  96 #define MAP(n) case BFD_RELOC_MEP_##n: type = R_MEP_##n; break
  97 #else
  98 #define MAP(n) case BFD_RELOC_MEP_/**/n: type = R_MEP_/**/n; break
  99 #endif
 100
 101 static reloc_howto_type *
 102 mep_reloc_type_lookup
 103     (bfd * abfd ATTRIBUTE_UNUSED,
 104      bfd_reloc_code_real_type code)
 105 {
 106   unsigned int type = 0;
 107
 108   switch (code)
 109     {
 110     MAP(NONE);
 111     case BFD_RELOC_8:
 112       type = R_MEP_8;
 113       break;
 114     case BFD_RELOC_16:
 115       type = R_MEP_16;
 116       break;
 117     case BFD_RELOC_32:
 118       type = R_MEP_32;
 119       break;
 120     case BFD_RELOC_VTABLE_ENTRY:
 121       type = R_MEP_GNU_VTENTRY;
 122       break;
 123     case BFD_RELOC_VTABLE_INHERIT:
 124       type = R_MEP_GNU_VTINHERIT;
 125       break;
 126     case BFD_RELOC_RELC:
 127       type = R_RELC;
 128       break;
 129
 130     /* MEPRELOC:MAP */
 131     /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
 132     MAP(8);
 133     MAP(16);
 134     MAP(32);
 135     MAP(PCREL8A2);
 136     MAP(PCREL12A2);
 137     MAP(PCREL17A2);
 138     MAP(PCREL24A2);
 139     MAP(PCABS24A2);
 140     MAP(LOW16);
 141     MAP(HI16U);
 142     MAP(HI16S);
 143     MAP(GPREL);
 144     MAP(TPREL);
 145     MAP(TPREL7);
 146     MAP(TPREL7A2);
 147     MAP(TPREL7A4);
 148     MAP(UIMM24);
 149     MAP(ADDR24A4);
 150     MAP(GNU_VTINHERIT);
 151     MAP(GNU_VTENTRY);
 152     /* MEPRELOC:END */
 153
 154     default:
 155       /* Pacify gcc -Wall.  */
 156       (*_bfd_error_handler) (_("mep: no reloc for code %d"), code);
 157       return NULL;
 158     }
 159
 160   if (mep_elf_howto_table[type].type != type)
 161     {
 162       (*_bfd_error_handler) (_("MeP: howto %d has type %d"),
 163                              type, mep_elf_howto_table[type].type);
 164       abort ();
 165     }
 166
 167   return mep_elf_howto_table + type;
 168 }
 169
 170 #undef MAP
 171
 172 static reloc_howto_type *
 173 mep_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
 174 {
 175   unsigned int i;
 176
 177   for (i = 0;
 178        i < sizeof (mep_elf_howto_table) / sizeof (mep_elf_howto_table[0]);
 179        i++)
 180     if (mep_elf_howto_table[i].name != NULL
 181         && strcasecmp (mep_elf_howto_table[i].name, r_name) == 0)
 182       return &mep_elf_howto_table[i];
 183
 184   return NULL;
 185 }
 186 \f
 187 /* Perform a single relocation.  */
 188
 189 static struct bfd_link_info *mep_info;
 190 static int warn_tp = 0, warn_sda = 0;
 191
 192 static bfd_vma
 193 mep_lookup_global
 194     (char *    name,
 195      bfd_vma   ofs,
 196      bfd_vma * cache,
 197      int *     warn)
 198 {
 199   struct bfd_link_hash_entry *h;
 200
 201   if (*cache || *warn)
 202     return *cache;
 203
 204   h = bfd_link_hash_lookup (mep_info->hash, name, FALSE, FALSE, TRUE);
 205   if (h == 0 || h->type != bfd_link_hash_defined)
 206     {
 207       *warn = ofs + 1;
 208       return 0;
 209     }
 210   *cache = (h->u.def.value
 211           + h->u.def.section->output_section->vma
 212           + h->u.def.section->output_offset);
 213   return *cache;
 214 }
 215
 216 static bfd_vma
 217 mep_tpoff_base (bfd_vma ofs)
 218 {
 219   static bfd_vma cache = 0;
 220   return mep_lookup_global ("__tpbase", ofs, &cache, &warn_tp);
 221 }
 222
 223 static bfd_vma
 224 mep_sdaoff_base (bfd_vma ofs)
 225 {
 226   static bfd_vma cache = 0;
 227   return mep_lookup_global ("__sdabase", ofs, &cache, &warn_sda);
 228 }
 229
 230 static bfd_reloc_status_type
 231 mep_final_link_relocate
 232     (reloc_howto_type *  howto,
 233      bfd *               input_bfd,
 234      asection *          input_section,
 235      bfd_byte *          contents,
 236      Elf_Internal_Rela * rel,
 237      bfd_vma             relocation)
 238 {
 239   unsigned long u;
 240   long s;
 241   unsigned char *byte;
 242   bfd_vma pc;
 243   bfd_reloc_status_type r = bfd_reloc_ok;
 244   int e2, e4;
 245
 246   if (bfd_big_endian (input_bfd))
 247     {
 248       e2 = 0;
 249       e4 = 0;
 250     }
 251   else
 252     {
 253       e2 = 1;
 254       e4 = 3;
 255     }
 256
 257   pc = (input_section->output_section->vma
 258         + input_section->output_offset
 259         + rel->r_offset);
 260
 261   s = relocation + rel->r_addend;
 262
 263   byte = (unsigned char *)contents + rel->r_offset;
 264
 265   if (howto->type == R_MEP_PCREL24A2
 266       && s == 0
 267       && pc >= 0x800000)
 268     {
 269       /* This is an unreachable branch to an undefined weak function.
 270          Silently ignore it, since the opcode can't do that but should
 271          never be executed anyway.  */
 272       return bfd_reloc_ok;
 273     }
 274
 275   if (howto->pc_relative)
 276     s -= pc;
 277
 278   u = (unsigned long) s;
 279
 280   switch (howto->type)
 281     {
 282     /* MEPRELOC:APPLY */
 283     /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
 284     case R_MEP_8: /* 76543210 */
 285       if (u > 255) r = bfd_reloc_overflow;
 286       byte[0] = (u & 0xff);
 287       break;
 288     case R_MEP_16: /* fedcba9876543210 */
 289       if (u > 65535) r = bfd_reloc_overflow;
 290       byte[0^e2] = ((u >> 8) & 0xff);
 291       byte[1^e2] = (u & 0xff);
 292       break;
 293     case R_MEP_32: /* vutsrqponmlkjihgfedcba9876543210 */
 294       byte[0^e4] = ((u >> 24) & 0xff);
 295       byte[1^e4] = ((u >> 16) & 0xff);
 296       byte[2^e4] = ((u >> 8) & 0xff);
 297       byte[3^e4] = (u & 0xff);
 298       break;
 299     case R_MEP_PCREL8A2: /* --------7654321- */
 300       if (-128 > s || s > 127) r = bfd_reloc_overflow;
 301       byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
 302       break;
 303     case R_MEP_PCREL12A2: /* ----ba987654321- */
 304       if (-2048 > s || s > 2047) r = bfd_reloc_overflow;
 305       byte[0^e2] = (byte[0^e2] & 0xf0) | ((s >> 8) & 0x0f);
 306       byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
 307       break;
 308     case R_MEP_PCREL17A2: /* ----------------gfedcba987654321 */
 309       if (-65536 > s || s > 65535) r = bfd_reloc_overflow;
 310       byte[2^e2] = ((s >> 9) & 0xff);
 311       byte[3^e2] = ((s >> 1) & 0xff);
 312       break;
 313     case R_MEP_PCREL24A2: /* -----7654321----nmlkjihgfedcba98 */
 314       if (-8388608 > s || s > 8388607) r = bfd_reloc_overflow;
 315       byte[0^e2] = (byte[0^e2] & 0xf8) | ((s >> 5) & 0x07);
 316       byte[1^e2] = (byte[1^e2] & 0x0f) | ((s << 3) & 0xf0);
 317       byte[2^e2] = ((s >> 16) & 0xff);
 318       byte[3^e2] = ((s >> 8) & 0xff);
 319       break;
 320     case R_MEP_PCABS24A2: /* -----7654321----nmlkjihgfedcba98 */
 321       if (u > 16777215) r = bfd_reloc_overflow;
 322       byte[0^e2] = (byte[0^e2] & 0xf8) | ((u >> 5) & 0x07);
 323       byte[1^e2] = (byte[1^e2] & 0x0f) | ((u << 3) & 0xf0);
 324       byte[2^e2] = ((u >> 16) & 0xff);
 325       byte[3^e2] = ((u >> 8) & 0xff);
 326       break;
 327     case R_MEP_LOW16: /* ----------------fedcba9876543210 */
 328       byte[2^e2] = ((u >> 8) & 0xff);
 329       byte[3^e2] = (u & 0xff);
 330       break;
 331     case R_MEP_HI16U: /* ----------------vutsrqponmlkjihg */
 332       byte[2^e2] = ((u >> 24) & 0xff);
 333       byte[3^e2] = ((u >> 16) & 0xff);
 334       break;
 335     case R_MEP_HI16S: /* ----------------vutsrqponmlkjihg */
 336       if (s & 0x8000)
 337         s += 0x10000;
 338       byte[2^e2] = ((s >> 24) & 0xff);
 339       byte[3^e2] = ((s >> 16) & 0xff);
 340       break;
 341     case R_MEP_GPREL: /* ----------------fedcba9876543210 */
 342       s -= mep_sdaoff_base(rel->r_offset);
 343       if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
 344       byte[2^e2] = ((s >> 8) & 0xff);
 345       byte[3^e2] = (s & 0xff);
 346       break;
 347     case R_MEP_TPREL: /* ----------------fedcba9876543210 */
 348       s -= mep_tpoff_base(rel->r_offset);
 349       if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
 350       byte[2^e2] = ((s >> 8) & 0xff);
 351       byte[3^e2] = (s & 0xff);
 352       break;
 353     case R_MEP_TPREL7: /* ---------6543210 */
 354       u -= mep_tpoff_base(rel->r_offset);
 355       if (u > 127) r = bfd_reloc_overflow;
 356       byte[1^e2] = (byte[1^e2] & 0x80) | (u & 0x7f);
 357       break;
 358     case R_MEP_TPREL7A2: /* ---------654321- */
 359       u -= mep_tpoff_base(rel->r_offset);
 360       if (u > 127) r = bfd_reloc_overflow;
 361       byte[1^e2] = (byte[1^e2] & 0x81) | (u & 0x7e);
 362       break;
 363     case R_MEP_TPREL7A4: /* ---------65432-- */
 364       u -= mep_tpoff_base(rel->r_offset);
 365       if (u > 127) r = bfd_reloc_overflow;
 366       byte[1^e2] = (byte[1^e2] & 0x83) | (u & 0x7c);
 367       break;
 368     case R_MEP_UIMM24: /* --------76543210nmlkjihgfedcba98 */
 369       if (u > 16777215) r = bfd_reloc_overflow;
 370       byte[1^e2] = (u & 0xff);
 371       byte[2^e2] = ((u >> 16) & 0xff);
 372       byte[3^e2] = ((u >> 8) & 0xff);
 373       break;
 374     case R_MEP_ADDR24A4: /* --------765432--nmlkjihgfedcba98 */
 375       if (u > 16777215) r = bfd_reloc_overflow;
 376       byte[1^e2] = (byte[1^e2] & 0x03) | (u & 0xfc);
 377       byte[2^e2] = ((u >> 16) & 0xff);
 378       byte[3^e2] = ((u >> 8) & 0xff);
 379       break;
 380     case R_MEP_GNU_VTINHERIT: /* ---------------- */
 381       break;
 382     case R_MEP_GNU_VTENTRY: /* ---------------- */
 383       break;
 384     /* MEPRELOC:END */
 385     default:
 386       abort ();
 387     }
 388
 389   return r;
 390 }
 391 \f
 392 /* Set the howto pointer for a MEP ELF reloc.  */
 393
 394 static void
 395 mep_info_to_howto_rela
 396     (bfd *               abfd ATTRIBUTE_UNUSED,
 397      arelent *           cache_ptr,
 398      Elf_Internal_Rela * dst)
 399 {
 400   unsigned int r_type;
 401
 402   r_type = ELF32_R_TYPE (dst->r_info);
 403   cache_ptr->howto = & mep_elf_howto_table [r_type];
 404 }
 405 \f
 406 /* Relocate a MEP ELF section.
 407    There is some attempt to make this function usable for many architectures,
 408    both USE_REL and USE_RELA ['twould be nice if such a critter existed],
 409    if only to serve as a learning tool.
 410
 411    The RELOCATE_SECTION function is called by the new ELF backend linker
 412    to handle the relocations for a section.
 413
 414    The relocs are always passed as Rela structures; if the section
 415    actually uses Rel structures, the r_addend field will always be
 416    zero.
 417
 418    This function is responsible for adjusting the section contents as
 419    necessary, and (if using Rela relocs and generating a relocatable
 420    output file) adjusting the reloc addend as necessary.
 421
 422    This function does not have to worry about setting the reloc
 423    address or the reloc symbol index.
 424
 425    LOCAL_SYMS is a pointer to the swapped in local symbols.
 426
 427    LOCAL_SECTIONS is an array giving the section in the input file
 428    corresponding to the st_shndx field of each local symbol.
 429
 430    The global hash table entry for the global symbols can be found
 431    via elf_sym_hashes (input_bfd).
 432
 433    When generating relocatable output, this function must handle
 434    STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 435    going to be the section symbol corresponding to the output
 436    section, which means that the addend must be adjusted
 437    accordingly.  */
 438
 439 static bfd_boolean
 440 mep_elf_relocate_section
 441     (bfd *                   output_bfd ATTRIBUTE_UNUSED,
 442      struct bfd_link_info *  info,
 443      bfd *                   input_bfd,
 444      asection *              input_section,
 445      bfd_byte *              contents,
 446      Elf_Internal_Rela *     relocs,
 447      Elf_Internal_Sym *      local_syms,
 448      asection **             local_sections)
 449 {
 450   Elf_Internal_Shdr *           symtab_hdr;
 451   struct elf_link_hash_entry ** sym_hashes;
 452   Elf_Internal_Rela *           rel;
 453   Elf_Internal_Rela *           relend;
 454
 455   symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
 456   sym_hashes = elf_sym_hashes (input_bfd);
 457   relend     = relocs + input_section->reloc_count;
 458
 459   mep_info = info;
 460
 461   for (rel = relocs; rel < relend; rel ++)
 462     {
 463       reloc_howto_type *           howto;
 464       unsigned long                r_symndx;
 465       Elf_Internal_Sym *           sym;
 466       asection *                   sec;
 467       struct elf_link_hash_entry * h;
 468       bfd_vma                      relocation;
 469       bfd_reloc_status_type        r;
 470       const char *                 name = NULL;
 471       int                          r_type;
 472
 473       r_type = ELF32_R_TYPE (rel->r_info);
 474       r_symndx = ELF32_R_SYM (rel->r_info);
 475       howto  = mep_elf_howto_table + ELF32_R_TYPE (rel->r_info);
 476       h      = NULL;
 477       sym    = NULL;
 478       sec    = NULL;
 479
 480       if (r_symndx < symtab_hdr->sh_info)
 481         {
 482           sym = local_syms + r_symndx;
 483           sec = local_sections [r_symndx];
 484           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
 485
 486           name = bfd_elf_string_from_elf_section
 487             (input_bfd, symtab_hdr->sh_link, sym->st_name);
 488           name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
 489         }
 490       else
 491         {
 492           bfd_boolean warned, unresolved_reloc, ignored;
 493
 494           RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,
 495                                   r_symndx, symtab_hdr, sym_hashes,
 496                                   h, sec, relocation,
 497                                   unresolved_reloc, warned, ignored);
 498
 499           name = h->root.root.string;
 500         }
 501
 502       if (sec != NULL && discarded_section (sec))
 503         RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
 504                                          rel, 1, relend, howto, 0, contents);
 505
 506       if (info->relocatable)
 507         continue;
 508
 509       if (r_type == R_RELC)
 510         r = bfd_elf_perform_complex_relocation (input_bfd, input_section,
 511                                                 contents, rel, relocation);
 512       else
 513         r = mep_final_link_relocate (howto, input_bfd, input_section,
 514                                      contents, rel, relocation);
 515
 516       if (r != bfd_reloc_ok)
 517         {
 518           const char * msg = (const char *) NULL;
 519
 520           switch (r)
 521             {
 522             case bfd_reloc_overflow:
 523               r = info->callbacks->reloc_overflow
 524                 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
 525                  input_bfd, input_section, rel->r_offset);
 526               break;
 527
 528             case bfd_reloc_undefined:
 529               r = info->callbacks->undefined_symbol
 530                 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
 531               break;
 532
 533             case bfd_reloc_outofrange:
 534               msg = _("internal error: out of range error");
 535               break;
 536
 537             case bfd_reloc_notsupported:
 538               msg = _("internal error: unsupported relocation error");
 539               break;
 540
 541             case bfd_reloc_dangerous:
 542               msg = _("internal error: dangerous relocation");
 543               break;
 544
 545             default:
 546               msg = _("internal error: unknown error");
 547               break;
 548             }
 549
 550           if (msg)
 551             r = info->callbacks->warning
 552               (info, msg, name, input_bfd, input_section, rel->r_offset);
 553
 554           if (! r)
 555             return FALSE;
 556         }
 557     }
 558
 559   if (warn_tp)
 560     info->callbacks->undefined_symbol
 561       (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE);
 562   if (warn_sda)
 563     info->callbacks->undefined_symbol
 564       (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE);
 565   if (warn_sda || warn_tp)
 566     return FALSE;
 567
 568   return TRUE;
 569 }
 570 \f
 571 /* Function to set the ELF flag bits.  */
 572
 573 static bfd_boolean
 574 mep_elf_set_private_flags (bfd *    abfd,
 575                            flagword flags)
 576 {
 577   elf_elfheader (abfd)->e_flags = flags;
 578   elf_flags_init (abfd) = TRUE;
 579   return TRUE;
 580 }
 581
 582 /* Merge backend specific data from an object file to the output
 583    object file when linking.  */
 584
 585 static bfd_boolean
 586 mep_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
 587 {
 588   static bfd *last_ibfd = 0;
 589   flagword old_flags, new_flags;
 590   flagword old_partial, new_partial;
 591
 592   /* Check if we have the same endianness.  */
 593   if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE)
 594     return FALSE;
 595
 596   new_flags = elf_elfheader (ibfd)->e_flags;
 597   old_flags = elf_elfheader (obfd)->e_flags;
 598
 599 #ifdef DEBUG
 600   _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s",
 601                       ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
 602 #endif
 603
 604     /* First call, no flags set.  */
 605     if (!elf_flags_init (obfd))
 606     {
 607       elf_flags_init (obfd) = TRUE;
 608       old_flags = new_flags;
 609     }
 610   else if ((new_flags | old_flags) & EF_MEP_LIBRARY)
 611     {
 612       /* Non-library flags trump library flags.  The choice doesn't really
 613          matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set.  */
 614       if (old_flags & EF_MEP_LIBRARY)
 615         old_flags = new_flags;
 616     }
 617   else
 618     {
 619       /* Make sure they're for the same mach.  Allow upgrade from the "mep"
 620          mach.  */
 621       new_partial = (new_flags & EF_MEP_CPU_MASK);
 622       old_partial = (old_flags & EF_MEP_CPU_MASK);
 623       if (new_partial == old_partial)
 624         ;
 625       else if (new_partial == EF_MEP_CPU_MEP)
 626         ;
 627       else if (old_partial == EF_MEP_CPU_MEP)
 628         old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial;
 629       else
 630         {
 631           _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd);
 632           bfd_set_error (bfd_error_invalid_target);
 633           return FALSE;
 634         }
 635
 636       /* Make sure they're for the same me_module.  Allow basic config to
 637          mix with any other.  */
 638       new_partial = (new_flags & EF_MEP_INDEX_MASK);
 639       old_partial = (old_flags & EF_MEP_INDEX_MASK);
 640       if (new_partial == old_partial)
 641         ;
 642       else if (new_partial == 0)
 643         ;
 644       else if (old_partial == 0)
 645         old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial;
 646       else
 647         {
 648           _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd);
 649           bfd_set_error (bfd_error_invalid_target);
 650           return FALSE;
 651         }
 652     }
 653
 654   elf_elfheader (obfd)->e_flags = old_flags;
 655   last_ibfd = ibfd;
 656   return TRUE;
 657 }
 658
 659 /* This will be edited by the MeP configration tool.  */
 660 static const char * config_names[] =
 661 {
 662   "basic"
 663   /* start-mepcfgtool */
 664   ,"default"
 665   /* end-mepcfgtool */
 666 };
 667
 668 static const char * core_names[] =
 669 {
 670   "MeP", "MeP-c2", "MeP-c3", "MeP-h1"
 671 };
 672
 673 static bfd_boolean
 674 mep_elf_print_private_bfd_data (bfd * abfd, void * ptr)
 675 {
 676   FILE *   file = (FILE *) ptr;
 677   flagword flags, partial_flags;
 678
 679   BFD_ASSERT (abfd != NULL && ptr != NULL);
 680
 681   /* Print normal ELF private data.  */
 682   _bfd_elf_print_private_bfd_data (abfd, ptr);
 683
 684   flags = elf_elfheader (abfd)->e_flags;
 685   fprintf (file, _("private flags = 0x%lx"), (unsigned long) flags);
 686
 687   partial_flags = (flags & EF_MEP_CPU_MASK) >> 24;
 688   if (partial_flags < ARRAY_SIZE (core_names))
 689     fprintf (file, "  core: %s", core_names[(long)partial_flags]);
 690
 691   partial_flags = flags & EF_MEP_INDEX_MASK;
 692   if (partial_flags < ARRAY_SIZE (config_names))
 693     fprintf (file, "  me_module: %s", config_names[(long)partial_flags]);
 694
 695   fputc ('\n', file);
 696
 697   return TRUE;
 698 }
 699
 700 /* Return the machine subcode from the ELF e_flags header.  */
 701
 702 static int
 703 elf32_mep_machine (bfd * abfd)
 704 {
 705   switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK)
 706     {
 707     default: break;
 708     case EF_MEP_CPU_C2: return bfd_mach_mep;
 709     case EF_MEP_CPU_C3: return bfd_mach_mep;
 710     case EF_MEP_CPU_C4: return bfd_mach_mep;
 711     case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
 712     case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
 713     }
 714
 715   return bfd_mach_mep;
 716 }
 717
 718 static bfd_boolean
 719 mep_elf_object_p (bfd * abfd)
 720 {
 721   bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd));
 722   return TRUE;
 723 }
 724
 725 static bfd_boolean
 726 mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr)
 727 {
 728   if (hdr->sh_flags & SHF_MEP_VLIW)
 729     * flags |= SEC_MEP_VLIW;
 730   return TRUE;
 731 }
 732
 733 static bfd_boolean
 734 mep_elf_fake_sections (bfd *               abfd ATTRIBUTE_UNUSED,
 735                        Elf_Internal_Shdr * hdr,
 736                        asection *          sec)
 737 {
 738   if (sec->flags & SEC_MEP_VLIW)
 739     hdr->sh_flags |= SHF_MEP_VLIW;
 740   return TRUE;
 741 }
 742
 743 \f
 744 #define ELF_ARCH                bfd_arch_mep
 745 #define ELF_MACHINE_CODE        EM_CYGNUS_MEP
 746 #define ELF_MAXPAGESIZE         0x1000
 747
 748 #define TARGET_BIG_SYM          mep_elf32_vec
 749 #define TARGET_BIG_NAME         "elf32-mep"
 750
 751 #define TARGET_LITTLE_SYM       mep_elf32_le_vec
 752 #define TARGET_LITTLE_NAME      "elf32-mep-little"
 753
 754 #define elf_info_to_howto_rel                   NULL
 755 #define elf_info_to_howto                       mep_info_to_howto_rela
 756 #define elf_backend_relocate_section            mep_elf_relocate_section
 757 #define elf_backend_object_p                    mep_elf_object_p
 758 #define elf_backend_section_flags               mep_elf_section_flags
 759 #define elf_backend_fake_sections               mep_elf_fake_sections
 760
 761 #define bfd_elf32_bfd_reloc_type_lookup         mep_reloc_type_lookup
 762 #define bfd_elf32_bfd_reloc_name_lookup         mep_reloc_name_lookup
 763 #define bfd_elf32_bfd_set_private_flags         mep_elf_set_private_flags
 764 #define bfd_elf32_bfd_merge_private_bfd_data    mep_elf_merge_private_bfd_data
 765 #define bfd_elf32_bfd_print_private_bfd_data    mep_elf_print_private_bfd_data
 766
 767 #define elf_backend_rela_normal                 1
 768
 769 #include "elf32-target.h"