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_bitfield,    /* 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   EMPTY_HOWTO (11),
 218   EMPTY_HOWTO (12),
 219   EMPTY_HOWTO (13),
 220   EMPTY_HOWTO (14),
 221   EMPTY_HOWTO (15),
 222   EMPTY_HOWTO (16),
 223   EMPTY_HOWTO (17),
 224   EMPTY_HOWTO (18),
 225   EMPTY_HOWTO (19),
 226
 227   /* Mark beginning of a jump instruction (any form).  */
 228   HOWTO (R_M68HC11_RL_JUMP,     /* type */
 229          0,                     /* rightshift */
 230          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 231          0,                     /* bitsize */
 232          false,                 /* pc_relative */
 233          0,                     /* bitpos */
 234          complain_overflow_dont,        /* complain_on_overflow */
 235          m68hc11_elf_ignore_reloc,      /* special_function */
 236          "R_M68HC11_RL_JUMP",   /* name */
 237          true,                  /* partial_inplace */
 238          0,                     /* src_mask */
 239          0,                     /* dst_mask */
 240          true),                 /* pcrel_offset */
 241
 242   /* Mark beginning of Gcc relaxation group instruction.  */
 243   HOWTO (R_M68HC11_RL_GROUP,    /* type */
 244          0,                     /* rightshift */
 245          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 246          0,                     /* bitsize */
 247          false,                 /* pc_relative */
 248          0,                     /* bitpos */
 249          complain_overflow_dont,        /* complain_on_overflow */
 250          m68hc11_elf_ignore_reloc,      /* special_function */
 251          "R_M68HC11_RL_GROUP",  /* name */
 252          true,                  /* partial_inplace */
 253          0,                     /* src_mask */
 254          0,                     /* dst_mask */
 255          true),                 /* pcrel_offset */
 256 };
 257
 258 /* Map BFD reloc types to M68HC11 ELF reloc types.  */
 259
 260 struct m68hc11_reloc_map
 261 {
 262   bfd_reloc_code_real_type bfd_reloc_val;
 263   unsigned char elf_reloc_val;
 264 };
 265
 266 static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
 267   {BFD_RELOC_NONE, R_M68HC11_NONE,},
 268   {BFD_RELOC_8, R_M68HC11_8},
 269   {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
 270   {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
 271   {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
 272   {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
 273   {BFD_RELOC_16, R_M68HC11_16},
 274   {BFD_RELOC_32, R_M68HC11_32},
 275   {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
 276
 277   {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
 278   {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
 279
 280   {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
 281   {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
 282 };
 283
 284 static reloc_howto_type *
 285 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
 286      bfd *abfd ATTRIBUTE_UNUSED;
 287      bfd_reloc_code_real_type code;
 288 {
 289   unsigned int i;
 290
 291   for (i = 0;
 292        i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
 293        i++)
 294     {
 295       if (m68hc11_reloc_map[i].bfd_reloc_val == code)
 296         return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
 297     }
 298
 299   return NULL;
 300 }
 301
 302 /* This function is used for relocs which are only used for relaxing,
 303    which the linker should otherwise ignore.  */
 304
 305 static bfd_reloc_status_type
 306 m68hc11_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section,
 307                           output_bfd, error_message)
 308      bfd *abfd ATTRIBUTE_UNUSED;
 309      arelent *reloc_entry;
 310      asymbol *symbol ATTRIBUTE_UNUSED;
 311      PTR data ATTRIBUTE_UNUSED;
 312      asection *input_section;
 313      bfd *output_bfd;
 314      char **error_message ATTRIBUTE_UNUSED;
 315 {
 316   if (output_bfd != NULL)
 317     reloc_entry->address += input_section->output_offset;
 318   return bfd_reloc_ok;
 319 }
 320
 321 /* Set the howto pointer for an M68HC11 ELF reloc.  */
 322
 323 static void
 324 m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
 325      bfd *abfd ATTRIBUTE_UNUSED;
 326      arelent *cache_ptr;
 327      Elf32_Internal_Rel *dst;
 328 {
 329   unsigned int r_type;
 330
 331   r_type = ELF32_R_TYPE (dst->r_info);
 332   BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
 333   cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
 334 }
 335
 336 \f
 337 /* Set and control ELF flags in ELF header.  */
 338
 339 boolean
 340 _bfd_m68hc11_elf_set_private_flags (abfd, flags)
 341      bfd *abfd;
 342      flagword flags;
 343 {
 344   BFD_ASSERT (!elf_flags_init (abfd)
 345               || elf_elfheader (abfd)->e_flags == flags);
 346
 347   elf_elfheader (abfd)->e_flags = flags;
 348   elf_flags_init (abfd) = true;
 349   return true;
 350 }
 351
 352 /* Merge backend specific data from an object file to the output
 353    object file when linking.  */
 354
 355 boolean
 356 _bfd_m68hc11_elf_merge_private_bfd_data (ibfd, obfd)
 357      bfd *ibfd;
 358      bfd *obfd;
 359 {
 360   flagword old_flags;
 361   flagword new_flags;
 362   boolean ok = true;
 363
 364   /* Check if we have the same endianess */
 365   if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
 366     return false;
 367
 368   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
 369       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
 370     return true;
 371
 372   new_flags = elf_elfheader (ibfd)->e_flags;
 373   elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI;
 374   old_flags = elf_elfheader (obfd)->e_flags;
 375
 376   if (! elf_flags_init (obfd))
 377     {
 378       elf_flags_init (obfd) = true;
 379       elf_elfheader (obfd)->e_flags = new_flags;
 380       elf_elfheader (obfd)->e_ident[EI_CLASS]
 381         = elf_elfheader (ibfd)->e_ident[EI_CLASS];
 382
 383       if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
 384           && bfd_get_arch_info (obfd)->the_default)
 385         {
 386           if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
 387                                    bfd_get_mach (ibfd)))
 388             return false;
 389         }
 390
 391       return true;
 392     }
 393
 394   /* Check ABI compatibility.  */
 395   if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32))
 396     {
 397       (*_bfd_error_handler)
 398         (_("%s: linking files compiled for 16-bit integers (-mshort) "
 399            "and others for 32-bit integers"),
 400          bfd_archive_filename (ibfd));
 401       ok = false;
 402     }
 403   if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64))
 404     {
 405       (*_bfd_error_handler)
 406         (_("%s: linking files compiled for 32-bit double (-fshort-double) "
 407            "and others for 64-bit double"),
 408          bfd_archive_filename (ibfd));
 409       ok = false;
 410     }
 411   new_flags &= ~EF_M68HC11_ABI;
 412   old_flags &= ~EF_M68HC11_ABI;
 413
 414   /* Warn about any other mismatches */
 415   if (new_flags != old_flags)
 416     {
 417       (*_bfd_error_handler)
 418         (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
 419          bfd_archive_filename (ibfd), (unsigned long) new_flags,
 420          (unsigned long) old_flags);
 421       ok = false;
 422     }
 423
 424   if (! ok)
 425     {
 426       bfd_set_error (bfd_error_bad_value);
 427       return false;
 428     }
 429
 430   return true;
 431 }
 432
 433 boolean
 434 _bfd_m68hc11_elf_print_private_bfd_data (abfd, ptr)
 435      bfd *abfd;
 436      PTR ptr;
 437 {
 438   FILE *file = (FILE *) ptr;
 439
 440   BFD_ASSERT (abfd != NULL && ptr != NULL);
 441
 442   /* Print normal ELF private data.  */
 443   _bfd_elf_print_private_bfd_data (abfd, ptr);
 444
 445   /* xgettext:c-format */
 446   fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
 447
 448   if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32)
 449     fprintf (file, _("[abi=32-bit int,"));
 450   else
 451     fprintf (file, _("[abi=16-bit int,"));
 452
 453   if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64)
 454     fprintf (file, _(" 64-bit double]"));
 455   else
 456     fprintf (file, _(" 32-bit double]"));
 457
 458   if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS)
 459     fprintf (file, _(" [memory=bank-model]"));
 460   else
 461     fprintf (file, _(" [memory=flat]"));
 462
 463   fputc ('\n', file);
 464
 465   return true;
 466 }
 467
 468 /* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c.
 469    The Motorola spec says to use a different Elf machine code.  */
 470 #define ELF_ARCH                bfd_arch_m68hc11
 471 #define ELF_MACHINE_CODE        EM_68HC11
 472 #define ELF_MAXPAGESIZE         0x1000
 473
 474 #define TARGET_BIG_SYM          bfd_elf32_m68hc11_vec
 475 #define TARGET_BIG_NAME         "elf32-m68hc11"
 476
 477 #define elf_info_to_howto       0
 478 #define elf_info_to_howto_rel   m68hc11_info_to_howto_rel
 479 #define elf_backend_object_p    0
 480 #define elf_backend_final_write_processing      0
 481
 482 #define bfd_elf32_bfd_merge_private_bfd_data \
 483                                         _bfd_m68hc11_elf_merge_private_bfd_data
 484 #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
 485 #define bfd_elf32_bfd_print_private_bfd_data \
 486                                         _bfd_m68hc11_elf_print_private_bfd_data
 487
 488 #include "elf32-target.h"