bfd/elf32-m68hc11.c

   1 /* Motorola 68HC11-specific support for 32-bit ELF
   2    Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   3    Contributed by Stephane Carrez (stcarrez@nerim.fr)
   4    (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "elf/m68hc11.h"
  27
  28 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  29 PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
  30 static void m68hc11_info_to_howto_rel
  31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
  32
  33 static bfd_reloc_status_type m68hc11_elf_ignore_reloc
  34 PARAMS ((bfd *abfd, arelent *reloc_entry,
  35          asymbol *symbol, PTR data, asection *input_section,
  36          bfd *output_bfd, char **error_message));
  37
  38 boolean _bfd_m68hc11_elf_merge_private_bfd_data PARAMS ((bfd*, bfd*));
  39 boolean _bfd_m68hc11_elf_set_private_flags PARAMS ((bfd*, flagword));
  40 boolean _bfd_m68hc11_elf_print_private_bfd_data PARAMS ((bfd*, PTR));
  41
  42 /* Use REL instead of RELA to save space */
  43 #define USE_REL
  44
  45 /* The Motorola 68HC11 microcontroler only addresses 64Kb.
  46    We must handle 8 and 16-bit relocations.  The 32-bit relocation
  47    is defined but not used except by gas when -gstabs is used (which
  48    is wrong).
  49    The 3-bit and 16-bit PC rel relocation is only used by 68HC12.  */
  50 static reloc_howto_type elf_m68hc11_howto_table[] = {
  51   /* This reloc does nothing.  */
  52   HOWTO (R_M68HC11_NONE,        /* type */
  53          0,                     /* rightshift */
  54          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  55          32,                    /* bitsize */
  56          false,                 /* pc_relative */
  57          0,                     /* bitpos */
  58          complain_overflow_dont,/* complain_on_overflow */
  59          bfd_elf_generic_reloc, /* special_function */
  60          "R_M68HC11_NONE",      /* name */
  61          false,                 /* partial_inplace */
  62          0,                     /* src_mask */
  63          0,                     /* dst_mask */
  64          false),                /* pcrel_offset */
  65
  66   /* A 8 bit absolute relocation */
  67   HOWTO (R_M68HC11_8,           /* type */
  68          0,                     /* rightshift */
  69          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  70          8,                     /* bitsize */
  71          false,                 /* pc_relative */
  72          0,                     /* bitpos */
  73          complain_overflow_bitfield,    /* complain_on_overflow */
  74          bfd_elf_generic_reloc, /* special_function */
  75          "R_M68HC11_8",         /* name */
  76          false,                 /* partial_inplace */
  77          0x00ff,                /* src_mask */
  78          0x00ff,                /* dst_mask */
  79          false),                /* pcrel_offset */
  80
  81   /* A 8 bit absolute relocation (upper address) */
  82   HOWTO (R_M68HC11_HI8,         /* type */
  83          8,                     /* rightshift */
  84          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  85          8,                     /* bitsize */
  86          false,                 /* pc_relative */
  87          0,                     /* bitpos */
  88          complain_overflow_bitfield,    /* complain_on_overflow */
  89          bfd_elf_generic_reloc, /* special_function */
  90          "R_M68HC11_HI8",       /* name */
  91          false,                 /* partial_inplace */
  92          0x00ff,                /* src_mask */
  93          0x00ff,                /* dst_mask */
  94          false),                /* pcrel_offset */
  95
  96   /* A 8 bit absolute relocation (upper address) */
  97   HOWTO (R_M68HC11_LO8,         /* type */
  98          0,                     /* rightshift */
  99          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 100          8,                     /* bitsize */
 101          false,                 /* pc_relative */
 102          0,                     /* bitpos */
 103          complain_overflow_dont,        /* complain_on_overflow */
 104          bfd_elf_generic_reloc, /* special_function */
 105          "R_M68HC11_LO8",       /* name */
 106          false,                 /* partial_inplace */
 107          0x00ff,                /* src_mask */
 108          0x00ff,                /* dst_mask */
 109          false),                /* pcrel_offset */
 110
 111   /* A 8 bit PC-rel relocation */
 112   HOWTO (R_M68HC11_PCREL_8,     /* type */
 113          0,                     /* rightshift */
 114          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 115          8,                     /* bitsize */
 116          true,                  /* pc_relative */
 117          0,                     /* bitpos */
 118          complain_overflow_bitfield,    /* complain_on_overflow */
 119          bfd_elf_generic_reloc, /* special_function */
 120          "R_M68HC11_PCREL_8",   /* name */
 121          false,                 /* partial_inplace */
 122          0x00ff,                /* src_mask */
 123          0x00ff,                /* dst_mask */
 124          false),                /* pcrel_offset */
 125
 126   /* A 16 bit absolute relocation */
 127   HOWTO (R_M68HC11_16,          /* type */
 128          0,                     /* rightshift */
 129          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 130          16,                    /* bitsize */
 131          false,                 /* pc_relative */
 132          0,                     /* bitpos */
 133          complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
 134          bfd_elf_generic_reloc, /* special_function */
 135          "R_M68HC11_16",        /* name */
 136          false,                 /* partial_inplace */
 137          0xffff,                /* src_mask */
 138          0xffff,                /* dst_mask */
 139          false),                /* pcrel_offset */
 140
 141   /* A 32 bit absolute relocation.  This one is never used for the
 142      code relocation.  It's used by gas for -gstabs generation.  */
 143   HOWTO (R_M68HC11_32,          /* type */
 144          0,                     /* rightshift */
 145          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 146          32,                    /* bitsize */
 147          false,                 /* pc_relative */
 148          0,                     /* bitpos */
 149          complain_overflow_bitfield,    /* complain_on_overflow */
 150          bfd_elf_generic_reloc, /* special_function */
 151          "R_M68HC11_32",        /* name */
 152          false,                 /* partial_inplace */
 153          0xffffffff,            /* src_mask */
 154          0xffffffff,            /* dst_mask */
 155          false),                /* pcrel_offset */
 156
 157   /* A 3 bit absolute relocation */
 158   HOWTO (R_M68HC11_3B,          /* type */
 159          0,                     /* rightshift */
 160          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 161          3,                     /* bitsize */
 162          false,                 /* pc_relative */
 163          0,                     /* bitpos */
 164          complain_overflow_bitfield,    /* complain_on_overflow */
 165          bfd_elf_generic_reloc, /* special_function */
 166          "R_M68HC11_4B",        /* name */
 167          false,                 /* partial_inplace */
 168          0x003,                 /* src_mask */
 169          0x003,                 /* dst_mask */
 170          false),                /* pcrel_offset */
 171
 172   /* A 16 bit PC-rel relocation */
 173   HOWTO (R_M68HC11_PCREL_16,    /* type */
 174          0,                     /* rightshift */
 175          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 176          16,                    /* bitsize */
 177          true,                  /* pc_relative */
 178          0,                     /* bitpos */
 179          complain_overflow_dont,        /* complain_on_overflow */
 180          bfd_elf_generic_reloc, /* special_function */
 181          "R_M68HC11_PCREL_16",  /* name */
 182          false,                 /* partial_inplace */
 183          0xffff,                /* src_mask */
 184          0xffff,                /* dst_mask */
 185          false),                /* pcrel_offset */
 186
 187   /* GNU extension to record C++ vtable hierarchy */
 188   HOWTO (R_M68HC11_GNU_VTINHERIT,       /* type */
 189          0,                     /* rightshift */
 190          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 191          0,                     /* bitsize */
 192          false,                 /* pc_relative */
 193          0,                     /* bitpos */
 194          complain_overflow_dont,        /* complain_on_overflow */
 195          NULL,                  /* special_function */
 196          "R_M68HC11_GNU_VTINHERIT",     /* name */
 197          false,                 /* partial_inplace */
 198          0,                     /* src_mask */
 199          0,                     /* dst_mask */
 200          false),                /* pcrel_offset */
 201
 202   /* GNU extension to record C++ vtable member usage */
 203   HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
 204          0,                     /* rightshift */
 205          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 206          0,                     /* bitsize */
 207          false,                 /* pc_relative */
 208          0,                     /* bitpos */
 209          complain_overflow_dont,        /* complain_on_overflow */
 210          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 211          "R_M68HC11_GNU_VTENTRY",       /* name */
 212          false,                 /* partial_inplace */
 213          0,                     /* src_mask */
 214          0,                     /* dst_mask */
 215          false),                /* pcrel_offset */
 216
 217   /* A 24 bit relocation */
 218   HOWTO (R_M68HC11_24,          /* type */
 219          0,                     /* rightshift */
 220          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 221          24,                    /* bitsize */
 222          false,                 /* pc_relative */
 223          0,                     /* bitpos */
 224          complain_overflow_bitfield,    /* complain_on_overflow */
 225          bfd_elf_generic_reloc, /* special_function */
 226          "R_M68HC11_24",        /* name */
 227          false,                 /* partial_inplace */
 228          0xffff,                /* src_mask */
 229          0xffff,                /* dst_mask */
 230          false),                /* pcrel_offset */
 231
 232   /* A 16-bit low relocation */
 233   HOWTO (R_M68HC11_LO16,        /* type */
 234          0,                     /* rightshift */
 235          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 236          16,                    /* bitsize */
 237          false,                 /* pc_relative */
 238          0,                     /* bitpos */
 239          complain_overflow_bitfield,    /* complain_on_overflow */
 240          bfd_elf_generic_reloc, /* special_function */
 241          "R_M68HC11_LO16",      /* name */
 242          false,                 /* partial_inplace */
 243          0xffff,                /* src_mask */
 244          0xffff,                /* dst_mask */
 245          false),                /* pcrel_offset */
 246
 247   /* A page relocation */
 248   HOWTO (R_M68HC11_PAGE,        /* type */
 249          0,                     /* rightshift */
 250          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 251          8,                     /* bitsize */
 252          false,                 /* pc_relative */
 253          0,                     /* bitpos */
 254          complain_overflow_bitfield,    /* complain_on_overflow */
 255          bfd_elf_generic_reloc, /* special_function */
 256          "R_M68HC11_PAGE",      /* name */
 257          false,                 /* partial_inplace */
 258          0x00ff,                /* src_mask */
 259          0x00ff,                /* dst_mask */
 260          false),                /* pcrel_offset */
 261
 262   EMPTY_HOWTO (14),
 263   EMPTY_HOWTO (15),
 264   EMPTY_HOWTO (16),
 265   EMPTY_HOWTO (17),
 266   EMPTY_HOWTO (18),
 267   EMPTY_HOWTO (19),
 268
 269   /* Mark beginning of a jump instruction (any form).  */
 270   HOWTO (R_M68HC11_RL_JUMP,     /* type */
 271          0,                     /* rightshift */
 272          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 273          0,                     /* bitsize */
 274          false,                 /* pc_relative */
 275          0,                     /* bitpos */
 276          complain_overflow_dont,        /* complain_on_overflow */
 277          m68hc11_elf_ignore_reloc,      /* special_function */
 278          "R_M68HC11_RL_JUMP",   /* name */
 279          true,                  /* partial_inplace */
 280          0,                     /* src_mask */
 281          0,                     /* dst_mask */
 282          true),                 /* pcrel_offset */
 283
 284   /* Mark beginning of Gcc relaxation group instruction.  */
 285   HOWTO (R_M68HC11_RL_GROUP,    /* type */
 286          0,                     /* rightshift */
 287          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 288          0,                     /* bitsize */
 289          false,                 /* pc_relative */
 290          0,                     /* bitpos */
 291          complain_overflow_dont,        /* complain_on_overflow */
 292          m68hc11_elf_ignore_reloc,      /* special_function */
 293          "R_M68HC11_RL_GROUP",  /* name */
 294          true,                  /* partial_inplace */
 295          0,                     /* src_mask */
 296          0,                     /* dst_mask */
 297          true),                 /* pcrel_offset */
 298 };
 299
 300 /* Map BFD reloc types to M68HC11 ELF reloc types.  */
 301
 302 struct m68hc11_reloc_map
 303 {
 304   bfd_reloc_code_real_type bfd_reloc_val;
 305   unsigned char elf_reloc_val;
 306 };
 307
 308 static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
 309   {BFD_RELOC_NONE, R_M68HC11_NONE,},
 310   {BFD_RELOC_8, R_M68HC11_8},
 311   {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
 312   {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
 313   {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
 314   {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
 315   {BFD_RELOC_16, R_M68HC11_16},
 316   {BFD_RELOC_32, R_M68HC11_32},
 317   {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
 318
 319   {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
 320   {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
 321
 322   {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
 323   {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
 324   {BFD_RELOC_M68HC11_24, R_M68HC11_24},
 325
 326   {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
 327   {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
 328 };
 329
 330 static reloc_howto_type *
 331 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
 332      bfd *abfd ATTRIBUTE_UNUSED;
 333      bfd_reloc_code_real_type code;
 334 {
 335   unsigned int i;
 336
 337   for (i = 0;
 338        i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
 339        i++)
 340     {
 341       if (m68hc11_reloc_map[i].bfd_reloc_val == code)
 342         return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
 343     }
 344
 345   return NULL;
 346 }
 347
 348 /* This function is used for relocs which are only used for relaxing,
 349    which the linker should otherwise ignore.  */
 350
 351 static bfd_reloc_status_type
 352 m68hc11_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section,
 353                           output_bfd, error_message)
 354      bfd *abfd ATTRIBUTE_UNUSED;
 355      arelent *reloc_entry;
 356      asymbol *symbol ATTRIBUTE_UNUSED;
 357      PTR data ATTRIBUTE_UNUSED;
 358      asection *input_section;
 359      bfd *output_bfd;
 360      char **error_message ATTRIBUTE_UNUSED;
 361 {
 362   if (output_bfd != NULL)
 363     reloc_entry->address += input_section->output_offset;
 364   return bfd_reloc_ok;
 365 }
 366
 367 /* Set the howto pointer for an M68HC11 ELF reloc.  */
 368
 369 static void
 370 m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
 371      bfd *abfd ATTRIBUTE_UNUSED;
 372      arelent *cache_ptr;
 373      Elf32_Internal_Rel *dst;
 374 {
 375   unsigned int r_type;
 376
 377   r_type = ELF32_R_TYPE (dst->r_info);
 378   BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
 379   cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
 380 }
 381
 382 \f
 383 /* Set and control ELF flags in ELF header.  */
 384
 385 boolean
 386 _bfd_m68hc11_elf_set_private_flags (abfd, flags)
 387      bfd *abfd;
 388      flagword flags;
 389 {
 390   BFD_ASSERT (!elf_flags_init (abfd)
 391               || elf_elfheader (abfd)->e_flags == flags);
 392
 393   elf_elfheader (abfd)->e_flags = flags;
 394   elf_flags_init (abfd) = true;
 395   return true;
 396 }
 397
 398 /* Merge backend specific data from an object file to the output
 399    object file when linking.  */
 400
 401 boolean
 402 _bfd_m68hc11_elf_merge_private_bfd_data (ibfd, obfd)
 403      bfd *ibfd;
 404      bfd *obfd;
 405 {
 406   flagword old_flags;
 407   flagword new_flags;
 408   boolean ok = true;
 409
 410   /* Check if we have the same endianess */
 411   if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
 412     return false;
 413
 414   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
 415       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
 416     return true;
 417
 418   new_flags = elf_elfheader (ibfd)->e_flags;
 419   elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI;
 420   old_flags = elf_elfheader (obfd)->e_flags;
 421
 422   if (! elf_flags_init (obfd))
 423     {
 424       elf_flags_init (obfd) = true;
 425       elf_elfheader (obfd)->e_flags = new_flags;
 426       elf_elfheader (obfd)->e_ident[EI_CLASS]
 427         = elf_elfheader (ibfd)->e_ident[EI_CLASS];
 428
 429       if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
 430           && bfd_get_arch_info (obfd)->the_default)
 431         {
 432           if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
 433                                    bfd_get_mach (ibfd)))
 434             return false;
 435         }
 436
 437       return true;
 438     }
 439
 440   /* Check ABI compatibility.  */
 441   if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32))
 442     {
 443       (*_bfd_error_handler)
 444         (_("%s: linking files compiled for 16-bit integers (-mshort) "
 445            "and others for 32-bit integers"),
 446          bfd_archive_filename (ibfd));
 447       ok = false;
 448     }
 449   if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64))
 450     {
 451       (*_bfd_error_handler)
 452         (_("%s: linking files compiled for 32-bit double (-fshort-double) "
 453            "and others for 64-bit double"),
 454          bfd_archive_filename (ibfd));
 455       ok = false;
 456     }
 457   new_flags &= ~EF_M68HC11_ABI;
 458   old_flags &= ~EF_M68HC11_ABI;
 459
 460   /* Warn about any other mismatches */
 461   if (new_flags != old_flags)
 462     {
 463       (*_bfd_error_handler)
 464         (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
 465          bfd_archive_filename (ibfd), (unsigned long) new_flags,
 466          (unsigned long) old_flags);
 467       ok = false;
 468     }
 469
 470   if (! ok)
 471     {
 472       bfd_set_error (bfd_error_bad_value);
 473       return false;
 474     }
 475
 476   return true;
 477 }
 478
 479 boolean
 480 _bfd_m68hc11_elf_print_private_bfd_data (abfd, ptr)
 481      bfd *abfd;
 482      PTR ptr;
 483 {
 484   FILE *file = (FILE *) ptr;
 485
 486   BFD_ASSERT (abfd != NULL && ptr != NULL);
 487
 488   /* Print normal ELF private data.  */
 489   _bfd_elf_print_private_bfd_data (abfd, ptr);
 490
 491   /* xgettext:c-format */
 492   fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
 493
 494   if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32)
 495     fprintf (file, _("[abi=32-bit int,"));
 496   else
 497     fprintf (file, _("[abi=16-bit int,"));
 498
 499   if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64)
 500     fprintf (file, _(" 64-bit double]"));
 501   else
 502     fprintf (file, _(" 32-bit double]"));
 503
 504   if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS)
 505     fprintf (file, _(" [memory=bank-model]"));
 506   else
 507     fprintf (file, _(" [memory=flat]"));
 508
 509   fputc ('\n', file);
 510
 511   return true;
 512 }
 513
 514 /* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c.
 515    The Motorola spec says to use a different Elf machine code.  */
 516 #define ELF_ARCH                bfd_arch_m68hc11
 517 #define ELF_MACHINE_CODE        EM_68HC11
 518 #define ELF_MAXPAGESIZE         0x1000
 519
 520 #define TARGET_BIG_SYM          bfd_elf32_m68hc11_vec
 521 #define TARGET_BIG_NAME         "elf32-m68hc11"
 522
 523 #define elf_info_to_howto       0
 524 #define elf_info_to_howto_rel   m68hc11_info_to_howto_rel
 525 #define elf_backend_object_p    0
 526 #define elf_backend_final_write_processing      0
 527
 528 #define bfd_elf32_bfd_merge_private_bfd_data \
 529                                         _bfd_m68hc11_elf_merge_private_bfd_data
 530 #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
 531 #define bfd_elf32_bfd_print_private_bfd_data \
 532                                         _bfd_m68hc11_elf_print_private_bfd_data
 533
 534 #include "elf32-target.h"