bfd/elf32-mep.c

   1 /* MeP-specific support for 32-bit ELF.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   3    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       fprintf (stderr, "mep: no reloc for code %d\n", code);
 158       return NULL;
 159     }
 160
 161   if (mep_elf_howto_table[type].type != type)
 162     {
 163       fprintf (stderr, "MeP: howto %d has type %d\n", 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;
 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);
 498
 499           name = h->root.root.string;
 500         }
 501
 502       if (sec != NULL && elf_discarded_section (sec))
 503         {
 504           /* For relocs against symbols from removed linkonce sections,
 505              or sections discarded by a linker script, we just want the
 506              section contents zeroed.  Avoid any special processing.  */
 507           _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
 508           rel->r_info = 0;
 509           rel->r_addend = 0;
 510           continue;
 511         }
 512
 513       if (info->relocatable)
 514         continue;
 515
 516       if (r_type == R_RELC)
 517         r = bfd_elf_perform_complex_relocation (input_bfd, input_section,
 518                                                 contents, rel, relocation);
 519       else
 520         r = mep_final_link_relocate (howto, input_bfd, input_section,
 521                                      contents, rel, relocation);
 522
 523       if (r != bfd_reloc_ok)
 524         {
 525           const char * msg = (const char *) NULL;
 526
 527           switch (r)
 528             {
 529             case bfd_reloc_overflow:
 530               r = info->callbacks->reloc_overflow
 531                 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
 532                  input_bfd, input_section, rel->r_offset);
 533               break;
 534
 535             case bfd_reloc_undefined:
 536               r = info->callbacks->undefined_symbol
 537                 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
 538               break;
 539
 540             case bfd_reloc_outofrange:
 541               msg = _("internal error: out of range error");
 542               break;
 543
 544             case bfd_reloc_notsupported:
 545               msg = _("internal error: unsupported relocation error");
 546               break;
 547
 548             case bfd_reloc_dangerous:
 549               msg = _("internal error: dangerous relocation");
 550               break;
 551
 552             default:
 553               msg = _("internal error: unknown error");
 554               break;
 555             }
 556
 557           if (msg)
 558             r = info->callbacks->warning
 559               (info, msg, name, input_bfd, input_section, rel->r_offset);
 560
 561           if (! r)
 562             return FALSE;
 563         }
 564     }
 565
 566   if (warn_tp)
 567     info->callbacks->undefined_symbol
 568       (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE);
 569   if (warn_sda)
 570     info->callbacks->undefined_symbol
 571       (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE);
 572   if (warn_sda || warn_tp)
 573     return FALSE;
 574
 575   return TRUE;
 576 }
 577 \f
 578 /* Function to set the ELF flag bits.  */
 579
 580 static bfd_boolean
 581 mep_elf_set_private_flags (bfd *    abfd,
 582                            flagword flags)
 583 {
 584   elf_elfheader (abfd)->e_flags = flags;
 585   elf_flags_init (abfd) = TRUE;
 586   return TRUE;
 587 }
 588
 589 static bfd_boolean
 590 mep_elf_copy_private_bfd_data (bfd * ibfd, bfd * obfd)
 591 {
 592   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
 593       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
 594     return TRUE;
 595
 596   elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
 597   elf_flags_init (obfd) = TRUE;
 598
 599   /* Copy object attributes.  */
 600   _bfd_elf_copy_obj_attributes (ibfd, obfd);
 601
 602   return TRUE;
 603 }
 604
 605 /* Merge backend specific data from an object file to the output
 606    object file when linking.  */
 607
 608 static bfd_boolean
 609 mep_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
 610 {
 611   static bfd *last_ibfd = 0;
 612   flagword old_flags, new_flags;
 613   flagword old_partial, new_partial;
 614
 615   /* Check if we have the same endianess.  */
 616   if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE)
 617     return FALSE;
 618
 619   new_flags = elf_elfheader (ibfd)->e_flags;
 620   old_flags = elf_elfheader (obfd)->e_flags;
 621
 622 #ifdef DEBUG
 623   _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s",
 624                       ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
 625 #endif
 626
 627     /* First call, no flags set.  */
 628     if (!elf_flags_init (obfd))
 629     {
 630       elf_flags_init (obfd) = TRUE;
 631       old_flags = new_flags;
 632     }
 633   else if ((new_flags | old_flags) & EF_MEP_LIBRARY)
 634     {
 635       /* Non-library flags trump library flags.  The choice doesn't really
 636          matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set.  */
 637       if (old_flags & EF_MEP_LIBRARY)
 638         old_flags = new_flags;
 639     }
 640   else
 641     {
 642       /* Make sure they're for the same mach.  Allow upgrade from the "mep"
 643          mach.  */
 644       new_partial = (new_flags & EF_MEP_CPU_MASK);
 645       old_partial = (old_flags & EF_MEP_CPU_MASK);
 646       if (new_partial == old_partial)
 647         ;
 648       else if (new_partial == EF_MEP_CPU_MEP)
 649         ;
 650       else if (old_partial == EF_MEP_CPU_MEP)
 651         old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial;
 652       else
 653         {
 654           _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd);
 655           bfd_set_error (bfd_error_invalid_target);
 656           return FALSE;
 657         }
 658
 659       /* Make sure they're for the same me_module.  Allow basic config to
 660          mix with any other.  */
 661       new_partial = (new_flags & EF_MEP_INDEX_MASK);
 662       old_partial = (old_flags & EF_MEP_INDEX_MASK);
 663       if (new_partial == old_partial)
 664         ;
 665       else if (new_partial == 0)
 666         ;
 667       else if (old_partial == 0)
 668         old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial;
 669       else
 670         {
 671           _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd);
 672           bfd_set_error (bfd_error_invalid_target);
 673           return FALSE;
 674         }
 675     }
 676
 677   elf_elfheader (obfd)->e_flags = old_flags;
 678   last_ibfd = ibfd;
 679   return TRUE;
 680 }
 681
 682 /* This will be edited by the MeP configration tool.  */
 683 static const char * config_names[] =
 684 {
 685   "basic"
 686   /* start-mepcfgtool */
 687   ,"default"
 688   /* end-mepcfgtool */
 689 };
 690
 691 static const char * core_names[] =
 692 {
 693   "MeP", "MeP-c2", "MeP-c3", "MeP-h1"
 694 };
 695
 696 static bfd_boolean
 697 mep_elf_print_private_bfd_data (bfd * abfd, void * ptr)
 698 {
 699   FILE *   file = (FILE *) ptr;
 700   flagword flags, partial_flags;
 701
 702   BFD_ASSERT (abfd != NULL && ptr != NULL);
 703
 704   /* Print normal ELF private data.  */
 705   _bfd_elf_print_private_bfd_data (abfd, ptr);
 706
 707   flags = elf_elfheader (abfd)->e_flags;
 708   fprintf (file, _("private flags = 0x%lx"), (unsigned long) flags);
 709
 710   partial_flags = (flags & EF_MEP_CPU_MASK) >> 24;
 711   if (partial_flags < ARRAY_SIZE (core_names))
 712     fprintf (file, "  core: %s", core_names[(long)partial_flags]);
 713
 714   partial_flags = flags & EF_MEP_INDEX_MASK;
 715   if (partial_flags < ARRAY_SIZE (config_names))
 716     fprintf (file, "  me_module: %s", config_names[(long)partial_flags]);
 717
 718   fputc ('\n', file);
 719
 720   return TRUE;
 721 }
 722
 723 /* Return the machine subcode from the ELF e_flags header.  */
 724
 725 static int
 726 elf32_mep_machine (bfd * abfd)
 727 {
 728   switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK)
 729     {
 730     default: break;
 731     case EF_MEP_CPU_C2: return bfd_mach_mep;
 732     case EF_MEP_CPU_C3: return bfd_mach_mep;
 733     case EF_MEP_CPU_C4: return bfd_mach_mep;
 734     case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
 735     case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
 736     }
 737
 738   return bfd_mach_mep;
 739 }
 740
 741 static bfd_boolean
 742 mep_elf_object_p (bfd * abfd)
 743 {
 744   bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd));
 745   return TRUE;
 746 }
 747
 748 static bfd_boolean
 749 mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr)
 750 {
 751   if (hdr->sh_flags & SHF_MEP_VLIW)
 752     * flags |= SEC_MEP_VLIW;
 753   return TRUE;
 754 }
 755
 756 static bfd_boolean
 757 mep_elf_fake_sections (bfd *               abfd ATTRIBUTE_UNUSED,
 758                        Elf_Internal_Shdr * hdr,
 759                        asection *          sec)
 760 {
 761   if (sec->flags & SEC_MEP_VLIW)
 762     hdr->sh_flags |= SHF_MEP_VLIW;
 763   return TRUE;
 764 }
 765
 766 \f
 767 #define ELF_ARCH                bfd_arch_mep
 768 #define ELF_MACHINE_CODE        EM_CYGNUS_MEP
 769 #define ELF_MAXPAGESIZE         0x1000
 770
 771 #define TARGET_BIG_SYM          bfd_elf32_mep_vec
 772 #define TARGET_BIG_NAME         "elf32-mep"
 773
 774 #define TARGET_LITTLE_SYM       bfd_elf32_mep_little_vec
 775 #define TARGET_LITTLE_NAME      "elf32-mep-little"
 776
 777 #define elf_info_to_howto_rel                   NULL
 778 #define elf_info_to_howto                       mep_info_to_howto_rela
 779 #define elf_backend_relocate_section            mep_elf_relocate_section
 780 #define elf_backend_object_p                    mep_elf_object_p
 781 #define elf_backend_section_flags               mep_elf_section_flags
 782 #define elf_backend_fake_sections               mep_elf_fake_sections
 783
 784 #define bfd_elf32_bfd_reloc_type_lookup         mep_reloc_type_lookup
 785 #define bfd_elf32_bfd_reloc_name_lookup         mep_reloc_name_lookup
 786 #define bfd_elf32_bfd_set_private_flags         mep_elf_set_private_flags
 787 #define bfd_elf32_bfd_copy_private_bfd_data     mep_elf_copy_private_bfd_data
 788 #define bfd_elf32_bfd_merge_private_bfd_data    mep_elf_merge_private_bfd_data
 789 #define bfd_elf32_bfd_print_private_bfd_data    mep_elf_print_private_bfd_data
 790
 791 #define elf_backend_rela_normal                 1
 792
 793 #include "elf32-target.h"