bfd/elf32-mep.c

   1 /* MeP-specific support for 32-bit ELF.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   3    2010, 2011, 2012 Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "elf/mep.h"
  27 #include "libiberty.h"
  28
  29 /* Forward declarations.  */
  30
  31 /* Private relocation functions.  */
  32 \f
  33 #define MEPREL(type, size, bits, right, left, pcrel, overflow, mask) \
  34   {(unsigned)type, right, size, bits, pcrel, left, overflow, mep_reloc, #type, FALSE, 0, mask, 0 }
  35
  36 #define N complain_overflow_dont
  37 #define S complain_overflow_signed
  38 #define U complain_overflow_unsigned
  39
  40 static bfd_reloc_status_type mep_reloc (bfd *, arelent *, struct bfd_symbol *,
  41                                         void *, asection *, bfd *, char **);
  42
  43 static reloc_howto_type mep_elf_howto_table [] =
  44 {
  45   /* type, size, bits, leftshift, rightshift, pcrel, OD/OS/OU, mask.  */
  46   MEPREL (R_MEP_NONE,     0,  0, 0, 0, 0, N, 0),
  47   MEPREL (R_RELC,         0,  0, 0, 0, 0, N, 0),
  48   /* MEPRELOC:HOWTO */
  49     /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
  50   MEPREL (R_MEP_8,        0,  8, 0, 0, 0, U, 0xff),
  51   MEPREL (R_MEP_16,       1, 16, 0, 0, 0, U, 0xffff),
  52   MEPREL (R_MEP_32,       2, 32, 0, 0, 0, U, 0xffffffff),
  53   MEPREL (R_MEP_PCREL8A2, 1,  8, 1, 1, 1, S, 0x00fe),
  54   MEPREL (R_MEP_PCREL12A2,1, 12, 1, 1, 1, S, 0x0ffe),
  55   MEPREL (R_MEP_PCREL17A2,2, 17, 0, 1, 1, S, 0x0000ffff),
  56   MEPREL (R_MEP_PCREL24A2,2, 24, 0, 1, 1, S, 0x07f0ffff),
  57   MEPREL (R_MEP_PCABS24A2,2, 24, 0, 1, 0, U, 0x07f0ffff),
  58   MEPREL (R_MEP_LOW16,    2, 16, 0, 0, 0, N, 0x0000ffff),
  59   MEPREL (R_MEP_HI16U,    2, 32, 0,16, 0, N, 0x0000ffff),
  60   MEPREL (R_MEP_HI16S,    2, 32, 0,16, 0, N, 0x0000ffff),
  61   MEPREL (R_MEP_GPREL,    2, 16, 0, 0, 0, S, 0x0000ffff),
  62   MEPREL (R_MEP_TPREL,    2, 16, 0, 0, 0, S, 0x0000ffff),
  63   MEPREL (R_MEP_TPREL7,   1,  7, 0, 0, 0, U, 0x007f),
  64   MEPREL (R_MEP_TPREL7A2, 1,  7, 1, 1, 0, U, 0x007e),
  65   MEPREL (R_MEP_TPREL7A4, 1,  7, 2, 2, 0, U, 0x007c),
  66   MEPREL (R_MEP_UIMM24,   2, 24, 0, 0, 0, U, 0x00ffffff),
  67   MEPREL (R_MEP_ADDR24A4, 2, 24, 0, 2, 0, U, 0x00fcffff),
  68   MEPREL (R_MEP_GNU_VTINHERIT,1,  0,16,32, 0, N, 0x0000),
  69   MEPREL (R_MEP_GNU_VTENTRY,1,  0,16,32, 0, N, 0x0000),
  70   /* MEPRELOC:END */
  71 };
  72
  73 #define VALID_MEP_RELOC(N) ((N) >= 0 \
  74   && (N) < ARRAY_SIZE (mep_elf_howto_table)
  75
  76 #undef N
  77 #undef S
  78 #undef U
  79
  80 static bfd_reloc_status_type
  81 mep_reloc
  82     (bfd *               abfd ATTRIBUTE_UNUSED,
  83      arelent *           reloc_entry ATTRIBUTE_UNUSED,
  84      struct bfd_symbol * symbol ATTRIBUTE_UNUSED,
  85      void *              data ATTRIBUTE_UNUSED,
  86      asection *          input_section ATTRIBUTE_UNUSED,
  87      bfd *               output_bfd ATTRIBUTE_UNUSED,
  88      char **             error_message ATTRIBUTE_UNUSED)
  89 {
  90   return bfd_reloc_ok;
  91 }
  92
  93 \f
  94
  95 #define BFD_RELOC_MEP_NONE BFD_RELOC_NONE
  96 #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
  97 #define MAP(n) case BFD_RELOC_MEP_##n: type = R_MEP_##n; break
  98 #else
  99 #define MAP(n) case BFD_RELOC_MEP_/**/n: type = R_MEP_/**/n; break
 100 #endif
 101
 102 static reloc_howto_type *
 103 mep_reloc_type_lookup
 104     (bfd * abfd ATTRIBUTE_UNUSED,
 105      bfd_reloc_code_real_type code)
 106 {
 107   unsigned int type = 0;
 108
 109   switch (code)
 110     {
 111     MAP(NONE);
 112     case BFD_RELOC_8:
 113       type = R_MEP_8;
 114       break;
 115     case BFD_RELOC_16:
 116       type = R_MEP_16;
 117       break;
 118     case BFD_RELOC_32:
 119       type = R_MEP_32;
 120       break;
 121     case BFD_RELOC_VTABLE_ENTRY:
 122       type = R_MEP_GNU_VTENTRY;
 123       break;
 124     case BFD_RELOC_VTABLE_INHERIT:
 125       type = R_MEP_GNU_VTINHERIT;
 126       break;
 127     case BFD_RELOC_RELC:
 128       type = R_RELC;
 129       break;
 130
 131     /* MEPRELOC:MAP */
 132     /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
 133     MAP(8);
 134     MAP(16);
 135     MAP(32);
 136     MAP(PCREL8A2);
 137     MAP(PCREL12A2);
 138     MAP(PCREL17A2);
 139     MAP(PCREL24A2);
 140     MAP(PCABS24A2);
 141     MAP(LOW16);
 142     MAP(HI16U);
 143     MAP(HI16S);
 144     MAP(GPREL);
 145     MAP(TPREL);
 146     MAP(TPREL7);
 147     MAP(TPREL7A2);
 148     MAP(TPREL7A4);
 149     MAP(UIMM24);
 150     MAP(ADDR24A4);
 151     MAP(GNU_VTINHERIT);
 152     MAP(GNU_VTENTRY);
 153     /* MEPRELOC:END */
 154
 155     default:
 156       /* Pacify gcc -Wall.  */
 157       (*_bfd_error_handler) (_("mep: no reloc for code %d"), code);
 158       return NULL;
 159     }
 160
 161   if (mep_elf_howto_table[type].type != type)
 162     {
 163       (*_bfd_error_handler) (_("MeP: howto %d has type %d"),
 164                              type, mep_elf_howto_table[type].type);
 165       abort ();
 166     }
 167
 168   return mep_elf_howto_table + type;
 169 }
 170
 171 #undef MAP
 172
 173 static reloc_howto_type *
 174 mep_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
 175 {
 176   unsigned int i;
 177
 178   for (i = 0;
 179        i < sizeof (mep_elf_howto_table) / sizeof (mep_elf_howto_table[0]);
 180        i++)
 181     if (mep_elf_howto_table[i].name != NULL
 182         && strcasecmp (mep_elf_howto_table[i].name, r_name) == 0)
 183       return &mep_elf_howto_table[i];
 184
 185   return NULL;
 186 }
 187 \f
 188 /* Perform a single relocation.  */
 189
 190 static struct bfd_link_info *mep_info;
 191 static int warn_tp = 0, warn_sda = 0;
 192
 193 static bfd_vma
 194 mep_lookup_global
 195     (char *    name,
 196      bfd_vma   ofs,
 197      bfd_vma * cache,
 198      int *     warn)
 199 {
 200   struct bfd_link_hash_entry *h;
 201
 202   if (*cache || *warn)
 203     return *cache;
 204
 205   h = bfd_link_hash_lookup (mep_info->hash, name, FALSE, FALSE, TRUE);
 206   if (h == 0 || h->type != bfd_link_hash_defined)
 207     {
 208       *warn = ofs + 1;
 209       return 0;
 210     }
 211   *cache = (h->u.def.value
 212           + h->u.def.section->output_section->vma
 213           + h->u.def.section->output_offset);
 214   return *cache;
 215 }
 216
 217 static bfd_vma
 218 mep_tpoff_base (bfd_vma ofs)
 219 {
 220   static bfd_vma cache = 0;
 221   return mep_lookup_global ("__tpbase", ofs, &cache, &warn_tp);
 222 }
 223
 224 static bfd_vma
 225 mep_sdaoff_base (bfd_vma ofs)
 226 {
 227   static bfd_vma cache = 0;
 228   return mep_lookup_global ("__sdabase", ofs, &cache, &warn_sda);
 229 }
 230
 231 static bfd_reloc_status_type
 232 mep_final_link_relocate
 233     (reloc_howto_type *  howto,
 234      bfd *               input_bfd,
 235      asection *          input_section,
 236      bfd_byte *          contents,
 237      Elf_Internal_Rela * rel,
 238      bfd_vma             relocation)
 239 {
 240   unsigned long u;
 241   long s;
 242   unsigned char *byte;
 243   bfd_vma pc;
 244   bfd_reloc_status_type r = bfd_reloc_ok;
 245   int e2, e4;
 246
 247   if (bfd_big_endian (input_bfd))
 248     {
 249       e2 = 0;
 250       e4 = 0;
 251     }
 252   else
 253     {
 254       e2 = 1;
 255       e4 = 3;
 256     }
 257
 258   pc = (input_section->output_section->vma
 259         + input_section->output_offset
 260         + rel->r_offset);
 261
 262   s = relocation + rel->r_addend;
 263
 264   byte = (unsigned char *)contents + rel->r_offset;
 265
 266   if (howto->type == R_MEP_PCREL24A2
 267       && s == 0
 268       && pc >= 0x800000)
 269     {
 270       /* This is an unreachable branch to an undefined weak function.
 271          Silently ignore it, since the opcode can't do that but should
 272          never be executed anyway.  */
 273       return bfd_reloc_ok;
 274     }
 275
 276   if (howto->pc_relative)
 277     s -= pc;
 278
 279   u = (unsigned long) s;
 280
 281   switch (howto->type)
 282     {
 283     /* MEPRELOC:APPLY */
 284     /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h.  */
 285     case R_MEP_8: /* 76543210 */
 286       if (u > 255) r = bfd_reloc_overflow;
 287       byte[0] = (u & 0xff);
 288       break;
 289     case R_MEP_16: /* fedcba9876543210 */
 290       if (u > 65535) r = bfd_reloc_overflow;
 291       byte[0^e2] = ((u >> 8) & 0xff);
 292       byte[1^e2] = (u & 0xff);
 293       break;
 294     case R_MEP_32: /* vutsrqponmlkjihgfedcba9876543210 */
 295       byte[0^e4] = ((u >> 24) & 0xff);
 296       byte[1^e4] = ((u >> 16) & 0xff);
 297       byte[2^e4] = ((u >> 8) & 0xff);
 298       byte[3^e4] = (u & 0xff);
 299       break;
 300     case R_MEP_PCREL8A2: /* --------7654321- */
 301       if (-128 > s || s > 127) r = bfd_reloc_overflow;
 302       byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
 303       break;
 304     case R_MEP_PCREL12A2: /* ----ba987654321- */
 305       if (-2048 > s || s > 2047) r = bfd_reloc_overflow;
 306       byte[0^e2] = (byte[0^e2] & 0xf0) | ((s >> 8) & 0x0f);
 307       byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
 308       break;
 309     case R_MEP_PCREL17A2: /* ----------------gfedcba987654321 */
 310       if (-65536 > s || s > 65535) r = bfd_reloc_overflow;
 311       byte[2^e2] = ((s >> 9) & 0xff);
 312       byte[3^e2] = ((s >> 1) & 0xff);
 313       break;
 314     case R_MEP_PCREL24A2: /* -----7654321----nmlkjihgfedcba98 */
 315       if (-8388608 > s || s > 8388607) r = bfd_reloc_overflow;
 316       byte[0^e2] = (byte[0^e2] & 0xf8) | ((s >> 5) & 0x07);
 317       byte[1^e2] = (byte[1^e2] & 0x0f) | ((s << 3) & 0xf0);
 318       byte[2^e2] = ((s >> 16) & 0xff);
 319       byte[3^e2] = ((s >> 8) & 0xff);
 320       break;
 321     case R_MEP_PCABS24A2: /* -----7654321----nmlkjihgfedcba98 */
 322       if (u > 16777215) r = bfd_reloc_overflow;
 323       byte[0^e2] = (byte[0^e2] & 0xf8) | ((u >> 5) & 0x07);
 324       byte[1^e2] = (byte[1^e2] & 0x0f) | ((u << 3) & 0xf0);
 325       byte[2^e2] = ((u >> 16) & 0xff);
 326       byte[3^e2] = ((u >> 8) & 0xff);
 327       break;
 328     case R_MEP_LOW16: /* ----------------fedcba9876543210 */
 329       byte[2^e2] = ((u >> 8) & 0xff);
 330       byte[3^e2] = (u & 0xff);
 331       break;
 332     case R_MEP_HI16U: /* ----------------vutsrqponmlkjihg */
 333       byte[2^e2] = ((u >> 24) & 0xff);
 334       byte[3^e2] = ((u >> 16) & 0xff);
 335       break;
 336     case R_MEP_HI16S: /* ----------------vutsrqponmlkjihg */
 337       if (s & 0x8000)
 338         s += 0x10000;
 339       byte[2^e2] = ((s >> 24) & 0xff);
 340       byte[3^e2] = ((s >> 16) & 0xff);
 341       break;
 342     case R_MEP_GPREL: /* ----------------fedcba9876543210 */
 343       s -= mep_sdaoff_base(rel->r_offset);
 344       if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
 345       byte[2^e2] = ((s >> 8) & 0xff);
 346       byte[3^e2] = (s & 0xff);
 347       break;
 348     case R_MEP_TPREL: /* ----------------fedcba9876543210 */
 349       s -= mep_tpoff_base(rel->r_offset);
 350       if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
 351       byte[2^e2] = ((s >> 8) & 0xff);
 352       byte[3^e2] = (s & 0xff);
 353       break;
 354     case R_MEP_TPREL7: /* ---------6543210 */
 355       u -= mep_tpoff_base(rel->r_offset);
 356       if (u > 127) r = bfd_reloc_overflow;
 357       byte[1^e2] = (byte[1^e2] & 0x80) | (u & 0x7f);
 358       break;
 359     case R_MEP_TPREL7A2: /* ---------654321- */
 360       u -= mep_tpoff_base(rel->r_offset);
 361       if (u > 127) r = bfd_reloc_overflow;
 362       byte[1^e2] = (byte[1^e2] & 0x81) | (u & 0x7e);
 363       break;
 364     case R_MEP_TPREL7A4: /* ---------65432-- */
 365       u -= mep_tpoff_base(rel->r_offset);
 366       if (u > 127) r = bfd_reloc_overflow;
 367       byte[1^e2] = (byte[1^e2] & 0x83) | (u & 0x7c);
 368       break;
 369     case R_MEP_UIMM24: /* --------76543210nmlkjihgfedcba98 */
 370       if (u > 16777215) r = bfd_reloc_overflow;
 371       byte[1^e2] = (u & 0xff);
 372       byte[2^e2] = ((u >> 16) & 0xff);
 373       byte[3^e2] = ((u >> 8) & 0xff);
 374       break;
 375     case R_MEP_ADDR24A4: /* --------765432--nmlkjihgfedcba98 */
 376       if (u > 16777215) r = bfd_reloc_overflow;
 377       byte[1^e2] = (byte[1^e2] & 0x03) | (u & 0xfc);
 378       byte[2^e2] = ((u >> 16) & 0xff);
 379       byte[3^e2] = ((u >> 8) & 0xff);
 380       break;
 381     case R_MEP_GNU_VTINHERIT: /* ---------------- */
 382       break;
 383     case R_MEP_GNU_VTENTRY: /* ---------------- */
 384       break;
 385     /* MEPRELOC:END */
 386     default:
 387       abort ();
 388     }
 389
 390   return r;
 391 }
 392 \f
 393 /* Set the howto pointer for a MEP ELF reloc.  */
 394
 395 static void
 396 mep_info_to_howto_rela
 397     (bfd *               abfd ATTRIBUTE_UNUSED,
 398      arelent *           cache_ptr,
 399      Elf_Internal_Rela * dst)
 400 {
 401   unsigned int r_type;
 402
 403   r_type = ELF32_R_TYPE (dst->r_info);
 404   cache_ptr->howto = & mep_elf_howto_table [r_type];
 405 }
 406 \f
 407 /* Relocate a MEP ELF section.
 408    There is some attempt to make this function usable for many architectures,
 409    both USE_REL and USE_RELA ['twould be nice if such a critter existed],
 410    if only to serve as a learning tool.
 411
 412    The RELOCATE_SECTION function is called by the new ELF backend linker
 413    to handle the relocations for a section.
 414
 415    The relocs are always passed as Rela structures; if the section
 416    actually uses Rel structures, the r_addend field will always be
 417    zero.
 418
 419    This function is responsible for adjusting the section contents as
 420    necessary, and (if using Rela relocs and generating a relocatable
 421    output file) adjusting the reloc addend as necessary.
 422
 423    This function does not have to worry about setting the reloc
 424    address or the reloc symbol index.
 425
 426    LOCAL_SYMS is a pointer to the swapped in local symbols.
 427
 428    LOCAL_SECTIONS is an array giving the section in the input file
 429    corresponding to the st_shndx field of each local symbol.
 430
 431    The global hash table entry for the global symbols can be found
 432    via elf_sym_hashes (input_bfd).
 433
 434    When generating relocatable output, this function must handle
 435    STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 436    going to be the section symbol corresponding to the output
 437    section, which means that the addend must be adjusted
 438    accordingly.  */
 439
 440 static bfd_boolean
 441 mep_elf_relocate_section
 442     (bfd *                   output_bfd ATTRIBUTE_UNUSED,
 443      struct bfd_link_info *  info,
 444      bfd *                   input_bfd,
 445      asection *              input_section,
 446      bfd_byte *              contents,
 447      Elf_Internal_Rela *     relocs,
 448      Elf_Internal_Sym *      local_syms,
 449      asection **             local_sections)
 450 {
 451   Elf_Internal_Shdr *           symtab_hdr;
 452   struct elf_link_hash_entry ** sym_hashes;
 453   Elf_Internal_Rela *           rel;
 454   Elf_Internal_Rela *           relend;
 455
 456   symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
 457   sym_hashes = elf_sym_hashes (input_bfd);
 458   relend     = relocs + input_section->reloc_count;
 459
 460   mep_info = info;
 461
 462   for (rel = relocs; rel < relend; rel ++)
 463     {
 464       reloc_howto_type *           howto;
 465       unsigned long                r_symndx;
 466       Elf_Internal_Sym *           sym;
 467       asection *                   sec;
 468       struct elf_link_hash_entry * h;
 469       bfd_vma                      relocation;
 470       bfd_reloc_status_type        r;
 471       const char *                 name = NULL;
 472       int                          r_type;
 473
 474       r_type = ELF32_R_TYPE (rel->r_info);
 475       r_symndx = ELF32_R_SYM (rel->r_info);
 476       howto  = mep_elf_howto_table + ELF32_R_TYPE (rel->r_info);
 477       h      = NULL;
 478       sym    = NULL;
 479       sec    = NULL;
 480
 481       if (r_symndx < symtab_hdr->sh_info)
 482         {
 483           sym = local_syms + r_symndx;
 484           sec = local_sections [r_symndx];
 485           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
 486
 487           name = bfd_elf_string_from_elf_section
 488             (input_bfd, symtab_hdr->sh_link, sym->st_name);
 489           name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
 490         }
 491       else
 492         {
 493           bfd_boolean warned, unresolved_reloc, ignored;
 494
 495           RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,
 496                                   r_symndx, symtab_hdr, sym_hashes,
 497                                   h, sec, relocation,
 498                                   unresolved_reloc, warned, ignored);
 499
 500           name = h->root.root.string;
 501         }
 502
 503       if (sec != NULL && discarded_section (sec))
 504         RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
 505                                          rel, 1, relend, howto, 0, contents);
 506
 507       if (info->relocatable)
 508         continue;
 509
 510       if (r_type == R_RELC)
 511         r = bfd_elf_perform_complex_relocation (input_bfd, input_section,
 512                                                 contents, rel, relocation);
 513       else
 514         r = mep_final_link_relocate (howto, input_bfd, input_section,
 515                                      contents, rel, relocation);
 516
 517       if (r != bfd_reloc_ok)
 518         {
 519           const char * msg = (const char *) NULL;
 520
 521           switch (r)
 522             {
 523             case bfd_reloc_overflow:
 524               r = info->callbacks->reloc_overflow
 525                 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
 526                  input_bfd, input_section, rel->r_offset);
 527               break;
 528
 529             case bfd_reloc_undefined:
 530               r = info->callbacks->undefined_symbol
 531                 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
 532               break;
 533
 534             case bfd_reloc_outofrange:
 535               msg = _("internal error: out of range error");
 536               break;
 537
 538             case bfd_reloc_notsupported:
 539               msg = _("internal error: unsupported relocation error");
 540               break;
 541
 542             case bfd_reloc_dangerous:
 543               msg = _("internal error: dangerous relocation");
 544               break;
 545
 546             default:
 547               msg = _("internal error: unknown error");
 548               break;
 549             }
 550
 551           if (msg)
 552             r = info->callbacks->warning
 553               (info, msg, name, input_bfd, input_section, rel->r_offset);
 554
 555           if (! r)
 556             return FALSE;
 557         }
 558     }
 559
 560   if (warn_tp)
 561     info->callbacks->undefined_symbol
 562       (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE);
 563   if (warn_sda)
 564     info->callbacks->undefined_symbol
 565       (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE);
 566   if (warn_sda || warn_tp)
 567     return FALSE;
 568
 569   return TRUE;
 570 }
 571 \f
 572 /* Function to set the ELF flag bits.  */
 573
 574 static bfd_boolean
 575 mep_elf_set_private_flags (bfd *    abfd,
 576                            flagword flags)
 577 {
 578   elf_elfheader (abfd)->e_flags = flags;
 579   elf_flags_init (abfd) = TRUE;
 580   return TRUE;
 581 }
 582
 583 /* Merge backend specific data from an object file to the output
 584    object file when linking.  */
 585
 586 static bfd_boolean
 587 mep_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
 588 {
 589   static bfd *last_ibfd = 0;
 590   flagword old_flags, new_flags;
 591   flagword old_partial, new_partial;
 592
 593   /* Check if we have the same endianness.  */
 594   if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE)
 595     return FALSE;
 596
 597   new_flags = elf_elfheader (ibfd)->e_flags;
 598   old_flags = elf_elfheader (obfd)->e_flags;
 599
 600 #ifdef DEBUG
 601   _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s",
 602                       ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
 603 #endif
 604
 605     /* First call, no flags set.  */
 606     if (!elf_flags_init (obfd))
 607     {
 608       elf_flags_init (obfd) = TRUE;
 609       old_flags = new_flags;
 610     }
 611   else if ((new_flags | old_flags) & EF_MEP_LIBRARY)
 612     {
 613       /* Non-library flags trump library flags.  The choice doesn't really
 614          matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set.  */
 615       if (old_flags & EF_MEP_LIBRARY)
 616         old_flags = new_flags;
 617     }
 618   else
 619     {
 620       /* Make sure they're for the same mach.  Allow upgrade from the "mep"
 621          mach.  */
 622       new_partial = (new_flags & EF_MEP_CPU_MASK);
 623       old_partial = (old_flags & EF_MEP_CPU_MASK);
 624       if (new_partial == old_partial)
 625         ;
 626       else if (new_partial == EF_MEP_CPU_MEP)
 627         ;
 628       else if (old_partial == EF_MEP_CPU_MEP)
 629         old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial;
 630       else
 631         {
 632           _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd);
 633           bfd_set_error (bfd_error_invalid_target);
 634           return FALSE;
 635         }
 636
 637       /* Make sure they're for the same me_module.  Allow basic config to
 638          mix with any other.  */
 639       new_partial = (new_flags & EF_MEP_INDEX_MASK);
 640       old_partial = (old_flags & EF_MEP_INDEX_MASK);
 641       if (new_partial == old_partial)
 642         ;
 643       else if (new_partial == 0)
 644         ;
 645       else if (old_partial == 0)
 646         old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial;
 647       else
 648         {
 649           _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd);
 650           bfd_set_error (bfd_error_invalid_target);
 651           return FALSE;
 652         }
 653     }
 654
 655   elf_elfheader (obfd)->e_flags = old_flags;
 656   last_ibfd = ibfd;
 657   return TRUE;
 658 }
 659
 660 /* This will be edited by the MeP configration tool.  */
 661 static const char * config_names[] =
 662 {
 663   "basic"
 664   /* start-mepcfgtool */
 665   ,"default"
 666   /* end-mepcfgtool */
 667 };
 668
 669 static const char * core_names[] =
 670 {
 671   "MeP", "MeP-c2", "MeP-c3", "MeP-h1"
 672 };
 673
 674 static bfd_boolean
 675 mep_elf_print_private_bfd_data (bfd * abfd, void * ptr)
 676 {
 677   FILE *   file = (FILE *) ptr;
 678   flagword flags, partial_flags;
 679
 680   BFD_ASSERT (abfd != NULL && ptr != NULL);
 681
 682   /* Print normal ELF private data.  */
 683   _bfd_elf_print_private_bfd_data (abfd, ptr);
 684
 685   flags = elf_elfheader (abfd)->e_flags;
 686   fprintf (file, _("private flags = 0x%lx"), (unsigned long) flags);
 687
 688   partial_flags = (flags & EF_MEP_CPU_MASK) >> 24;
 689   if (partial_flags < ARRAY_SIZE (core_names))
 690     fprintf (file, "  core: %s", core_names[(long)partial_flags]);
 691
 692   partial_flags = flags & EF_MEP_INDEX_MASK;
 693   if (partial_flags < ARRAY_SIZE (config_names))
 694     fprintf (file, "  me_module: %s", config_names[(long)partial_flags]);
 695
 696   fputc ('\n', file);
 697
 698   return TRUE;
 699 }
 700
 701 /* Return the machine subcode from the ELF e_flags header.  */
 702
 703 static int
 704 elf32_mep_machine (bfd * abfd)
 705 {
 706   switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK)
 707     {
 708     default: break;
 709     case EF_MEP_CPU_C2: return bfd_mach_mep;
 710     case EF_MEP_CPU_C3: return bfd_mach_mep;
 711     case EF_MEP_CPU_C4: return bfd_mach_mep;
 712     case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
 713     case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
 714     }
 715
 716   return bfd_mach_mep;
 717 }
 718
 719 static bfd_boolean
 720 mep_elf_object_p (bfd * abfd)
 721 {
 722   bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd));
 723   return TRUE;
 724 }
 725
 726 static bfd_boolean
 727 mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr)
 728 {
 729   if (hdr->sh_flags & SHF_MEP_VLIW)
 730     * flags |= SEC_MEP_VLIW;
 731   return TRUE;
 732 }
 733
 734 static bfd_boolean
 735 mep_elf_fake_sections (bfd *               abfd ATTRIBUTE_UNUSED,
 736                        Elf_Internal_Shdr * hdr,
 737                        asection *          sec)
 738 {
 739   if (sec->flags & SEC_MEP_VLIW)
 740     hdr->sh_flags |= SHF_MEP_VLIW;
 741   return TRUE;
 742 }
 743
 744 \f
 745 #define ELF_ARCH                bfd_arch_mep
 746 #define ELF_MACHINE_CODE        EM_CYGNUS_MEP
 747 #define ELF_MAXPAGESIZE         0x1000
 748
 749 #define TARGET_BIG_SYM          bfd_elf32_mep_vec
 750 #define TARGET_BIG_NAME         "elf32-mep"
 751
 752 #define TARGET_LITTLE_SYM       bfd_elf32_mep_little_vec
 753 #define TARGET_LITTLE_NAME      "elf32-mep-little"
 754
 755 #define elf_info_to_howto_rel                   NULL
 756 #define elf_info_to_howto                       mep_info_to_howto_rela
 757 #define elf_backend_relocate_section            mep_elf_relocate_section
 758 #define elf_backend_object_p                    mep_elf_object_p
 759 #define elf_backend_section_flags               mep_elf_section_flags
 760 #define elf_backend_fake_sections               mep_elf_fake_sections
 761
 762 #define bfd_elf32_bfd_reloc_type_lookup         mep_reloc_type_lookup
 763 #define bfd_elf32_bfd_reloc_name_lookup         mep_reloc_name_lookup
 764 #define bfd_elf32_bfd_set_private_flags         mep_elf_set_private_flags
 765 #define bfd_elf32_bfd_merge_private_bfd_data    mep_elf_merge_private_bfd_data
 766 #define bfd_elf32_bfd_print_private_bfd_data    mep_elf_print_private_bfd_data
 767
 768 #define elf_backend_rela_normal                 1
 769
 770 #include "elf32-target.h"