bfd/elf32-m68hc12.c

   1 /* Motorola 68HC12-specific support for 32-bit ELF
   2    Copyright (C) 1999-2020 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "bfdlink.h"
  26 #include "libbfd.h"
  27 #include "elf-bfd.h"
  28 #include "elf32-m68hc1x.h"
  29 #include "elf/m68hc11.h"
  30 #include "opcode/m68hc11.h"
  31
  32 /* Relocation functions.  */
  33 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  34   (bfd *, bfd_reloc_code_real_type);
  35 static bfd_boolean m68hc11_info_to_howto_rel
  36   (bfd *, arelent *, Elf_Internal_Rela *);
  37
  38 /* Trampoline generation.  */
  39
  40
  41 /* Use REL instead of RELA to save space */
  42 #define USE_REL 1
  43
  44 /* The 68HC12 microcontroler has a memory bank switching system
  45    with a 16Kb window in the 64Kb address space.  The extended memory
  46    is mapped in the 16Kb window (at 0x8000).  The page register controls
  47    which 16Kb bank is mapped.  The call/rtc instructions take care of
  48    bank switching in function calls/returns.
  49
  50    For GNU Binutils to work, we consider there is a physical memory
  51    at 0..0x0ffff and a kind of virtual memory above that.  Symbols
  52    in virtual memory have their addresses treated in a special way
  53    when disassembling and when linking.
  54
  55    For the linker to work properly, we must always relocate the virtual
  56    memory as if it is mapped at 0x8000.  When a 16-bit relocation is
  57    made in the virtual memory, we check that it does not cross the
  58    memory bank where it is used.  This would involve a page change
  59    which would be wrong.  The 24-bit relocation is for that and it
  60    treats the address as a physical address + page number.
  61
  62
  63                                         Banked
  64                                         Address Space
  65                                         |               |       Page n
  66                                         +---------------+ 0x1010000
  67                                         |               |
  68                                         | jsr _foo      |
  69                                         | ..            |       Page 3
  70                                         | _foo:         |
  71                                         +---------------+ 0x100C000
  72                                         |               |
  73                                         | call _bar     |
  74                                         | ..            |       Page 2
  75                                         | _bar:         |
  76                                         +---------------+ 0x1008000
  77                                 /------>|               |
  78                                 |       | call _foo     |       Page 1
  79                                 |       |               |
  80                                 |       +---------------+ 0x1004000
  81       Physical                  |       |               |
  82       Address Space             |       |               |       Page 0
  83                                 |       |               |
  84     +-----------+ 0x00FFFF      |       +---------------+ 0x1000000
  85     |           |               |
  86     | call _foo |               |
  87     |           |               |
  88     +-----------+ 0x00BFFF -+---/
  89     |           |           |
  90     |           |           |
  91     |           | 16K       |
  92     |           |           |
  93     +-----------+ 0x008000 -+
  94     |           |
  95     |           |
  96     =           =
  97     |           |
  98     |           |
  99     +-----------+ 0000
 100
 101
 102    The 'call _foo' must be relocated with page 3 and 16-bit address
 103    mapped at 0x8000.
 104
 105    The 3-bit and 16-bit PC rel relocation is only used by 68HC12.  */
 106 static reloc_howto_type elf_m68hc11_howto_table[] = {
 107   /* This reloc does nothing.  */
 108   HOWTO (R_M68HC11_NONE,        /* type */
 109          0,                     /* rightshift */
 110          3,                     /* size (0 = byte, 1 = short, 2 = long) */
 111          0,                     /* bitsize */
 112          FALSE,                 /* pc_relative */
 113          0,                     /* bitpos */
 114          complain_overflow_dont,/* complain_on_overflow */
 115          bfd_elf_generic_reloc, /* special_function */
 116          "R_M68HC12_NONE",      /* name */
 117          FALSE,                 /* partial_inplace */
 118          0,                     /* src_mask */
 119          0,                     /* dst_mask */
 120          FALSE),                /* pcrel_offset */
 121
 122   /* A 8 bit absolute relocation */
 123   HOWTO (R_M68HC11_8,           /* type */
 124          0,                     /* rightshift */
 125          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 126          8,                     /* bitsize */
 127          FALSE,                 /* pc_relative */
 128          0,                     /* bitpos */
 129          complain_overflow_bitfield,    /* complain_on_overflow */
 130          bfd_elf_generic_reloc, /* special_function */
 131          "R_M68HC12_8",         /* name */
 132          FALSE,                 /* partial_inplace */
 133          0x00ff,                /* src_mask */
 134          0x00ff,                /* dst_mask */
 135          FALSE),                /* pcrel_offset */
 136
 137   /* A 8 bit absolute relocation (upper address) */
 138   HOWTO (R_M68HC11_HI8,         /* type */
 139          8,                     /* rightshift */
 140          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 141          8,                     /* bitsize */
 142          FALSE,                 /* pc_relative */
 143          0,                     /* bitpos */
 144          complain_overflow_bitfield,    /* complain_on_overflow */
 145          bfd_elf_generic_reloc, /* special_function */
 146          "R_M68HC12_HI8",       /* name */
 147          FALSE,                 /* partial_inplace */
 148          0x00ff,                /* src_mask */
 149          0x00ff,                /* dst_mask */
 150          FALSE),                /* pcrel_offset */
 151
 152   /* A 8 bit absolute relocation (upper address) */
 153   HOWTO (R_M68HC11_LO8,         /* type */
 154          0,                     /* rightshift */
 155          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 156          8,                     /* bitsize */
 157          FALSE,                 /* pc_relative */
 158          0,                     /* bitpos */
 159          complain_overflow_dont,        /* complain_on_overflow */
 160          bfd_elf_generic_reloc, /* special_function */
 161          "R_M68HC12_LO8",       /* name */
 162          FALSE,                 /* partial_inplace */
 163          0x00ff,                /* src_mask */
 164          0x00ff,                /* dst_mask */
 165          FALSE),                /* pcrel_offset */
 166
 167   /* A 8 bit PC-rel relocation */
 168   HOWTO (R_M68HC11_PCREL_8,     /* type */
 169          0,                     /* rightshift */
 170          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 171          8,                     /* bitsize */
 172          TRUE,                  /* pc_relative */
 173          0,                     /* bitpos */
 174          complain_overflow_bitfield,    /* complain_on_overflow */
 175          bfd_elf_generic_reloc, /* special_function */
 176          "R_M68HC12_PCREL_8",   /* name */
 177          FALSE,                 /* partial_inplace */
 178          0x00ff,                /* src_mask */
 179          0x00ff,                /* dst_mask */
 180          TRUE),                 /* pcrel_offset */
 181
 182   /* A 16 bit absolute relocation */
 183   HOWTO (R_M68HC11_16,          /* type */
 184          0,                     /* rightshift */
 185          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 186          16,                    /* bitsize */
 187          FALSE,                 /* pc_relative */
 188          0,                     /* bitpos */
 189          complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
 190          bfd_elf_generic_reloc, /* special_function */
 191          "R_M68HC12_16",        /* name */
 192          FALSE,                 /* partial_inplace */
 193          0xffff,                /* src_mask */
 194          0xffff,                /* dst_mask */
 195          FALSE),                /* pcrel_offset */
 196
 197   /* A 32 bit absolute relocation.  This one is never used for the
 198      code relocation.  It's used by gas for -gstabs generation.  */
 199   HOWTO (R_M68HC11_32,          /* type */
 200          0,                     /* rightshift */
 201          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 202          32,                    /* bitsize */
 203          FALSE,                 /* pc_relative */
 204          0,                     /* bitpos */
 205          complain_overflow_bitfield,    /* complain_on_overflow */
 206          bfd_elf_generic_reloc, /* special_function */
 207          "R_M68HC12_32",        /* name */
 208          FALSE,                 /* partial_inplace */
 209          0xffffffff,            /* src_mask */
 210          0xffffffff,            /* dst_mask */
 211          FALSE),                /* pcrel_offset */
 212
 213   /* A 3 bit absolute relocation */
 214   HOWTO (R_M68HC11_3B,          /* type */
 215          0,                     /* rightshift */
 216          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 217          3,                     /* bitsize */
 218          FALSE,                 /* pc_relative */
 219          0,                     /* bitpos */
 220          complain_overflow_bitfield,    /* complain_on_overflow */
 221          bfd_elf_generic_reloc, /* special_function */
 222          "R_M68HC12_4B",        /* name */
 223          FALSE,                 /* partial_inplace */
 224          0x003,                 /* src_mask */
 225          0x003,                 /* dst_mask */
 226          FALSE),                /* pcrel_offset */
 227
 228   /* A 16 bit PC-rel relocation */
 229   HOWTO (R_M68HC11_PCREL_16,    /* type */
 230          0,                     /* rightshift */
 231          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 232          16,                    /* bitsize */
 233          TRUE,                  /* pc_relative */
 234          0,                     /* bitpos */
 235          complain_overflow_dont,        /* complain_on_overflow */
 236          bfd_elf_generic_reloc, /* special_function */
 237          "R_M68HC12_PCREL_16",  /* name */
 238          FALSE,                 /* partial_inplace */
 239          0xffff,                /* src_mask */
 240          0xffff,                /* dst_mask */
 241          TRUE),                 /* pcrel_offset */
 242
 243   /* GNU extension to record C++ vtable hierarchy */
 244   HOWTO (R_M68HC11_GNU_VTINHERIT,       /* type */
 245          0,                     /* rightshift */
 246          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 247          0,                     /* bitsize */
 248          FALSE,                 /* pc_relative */
 249          0,                     /* bitpos */
 250          complain_overflow_dont,        /* complain_on_overflow */
 251          NULL,                  /* special_function */
 252          "R_M68HC11_GNU_VTINHERIT",     /* name */
 253          FALSE,                 /* partial_inplace */
 254          0,                     /* src_mask */
 255          0,                     /* dst_mask */
 256          FALSE),                /* pcrel_offset */
 257
 258   /* GNU extension to record C++ vtable member usage */
 259   HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
 260          0,                     /* rightshift */
 261          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 262          0,                     /* bitsize */
 263          FALSE,                 /* pc_relative */
 264          0,                     /* bitpos */
 265          complain_overflow_dont,        /* complain_on_overflow */
 266          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 267          "R_M68HC11_GNU_VTENTRY",       /* name */
 268          FALSE,                 /* partial_inplace */
 269          0,                     /* src_mask */
 270          0,                     /* dst_mask */
 271          FALSE),                /* pcrel_offset */
 272
 273   /* A 24 bit relocation */
 274   HOWTO (R_M68HC11_24,          /* type */
 275          0,                     /* rightshift */
 276          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 277          24,                    /* bitsize */
 278          FALSE,                 /* pc_relative */
 279          0,                     /* bitpos */
 280          complain_overflow_dont,        /* complain_on_overflow */
 281          m68hc11_elf_special_reloc,     /* special_function */
 282          "R_M68HC12_24",        /* name */
 283          FALSE,                 /* partial_inplace */
 284          0xffffff,              /* src_mask */
 285          0xffffff,              /* dst_mask */
 286          FALSE),                /* pcrel_offset */
 287
 288   /* A 16-bit low relocation */
 289   HOWTO (R_M68HC11_LO16,        /* type */
 290          0,                     /* rightshift */
 291          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 292          16,                    /* bitsize */
 293          FALSE,                 /* pc_relative */
 294          0,                     /* bitpos */
 295          complain_overflow_dont,        /* complain_on_overflow */
 296          m68hc11_elf_special_reloc,/* special_function */
 297          "R_M68HC12_LO16",      /* name */
 298          FALSE,                 /* partial_inplace */
 299          0xffff,                /* src_mask */
 300          0xffff,                /* dst_mask */
 301          FALSE),                /* pcrel_offset */
 302
 303   /* A page relocation */
 304   HOWTO (R_M68HC11_PAGE,        /* type */
 305          0,                     /* rightshift */
 306          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 307          8,                     /* bitsize */
 308          FALSE,                 /* pc_relative */
 309          0,                     /* bitpos */
 310          complain_overflow_dont,        /* complain_on_overflow */
 311          m68hc11_elf_special_reloc,/* special_function */
 312          "R_M68HC12_PAGE",      /* name */
 313          FALSE,                 /* partial_inplace */
 314          0x00ff,                /* src_mask */
 315          0x00ff,                /* dst_mask */
 316          FALSE),                /* pcrel_offset */
 317
 318   EMPTY_HOWTO (14),
 319
 320   /* A 16 bit absolute relocation.  */
 321   HOWTO (R_M68HC12_16B,         /* type */
 322          0,                     /* rightshift */
 323          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 324          16,                    /* bitsize */
 325          FALSE,                 /* pc_relative */
 326          0,                     /* bitpos */
 327          complain_overflow_bitfield,    /* complain_on_overflow */
 328          bfd_elf_generic_reloc, /* special_function */
 329          "R_M68HC12_16B",       /* name */
 330          FALSE,                 /* partial_inplace */
 331          0xffff,                /* src_mask */
 332          0xffff,                /* dst_mask */
 333          FALSE),                /* pcrel_offset */
 334
 335   /* A 9 bit PC-rel relocation.  */
 336   HOWTO (R_M68HC12_PCREL_9,     /* type */
 337          1,                     /* rightshift */
 338          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 339          10,                    /* bitsize (result is >>1) */
 340          TRUE,                  /* pc_relative */
 341          0,                     /* bitpos */
 342          complain_overflow_dont,        /* complain_on_overflow */
 343          bfd_elf_generic_reloc, /* special_function */
 344          "R_M68HC12_PCREL_9",   /* name */
 345          TRUE,                  /* partial_inplace */
 346          0xfe00,                /* src_mask */
 347          0x01ff,                /* dst_mask */
 348          TRUE),                 /* pcrel_offset */
 349
 350   /* A 10 bit PC-rel relocation.  */
 351   HOWTO (R_M68HC12_PCREL_10,    /* type */
 352          1,                     /* rightshift */
 353          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 354          11,                    /* bitsize (result is >>1) */
 355          TRUE,                  /* pc_relative */
 356          0,                     /* bitpos */
 357          complain_overflow_dont,        /* complain_on_overflow */
 358          bfd_elf_generic_reloc, /* special_function */
 359          "R_M68HC12_PCREL_10",  /* name */
 360          TRUE,                  /* partial_inplace */
 361          0xfc00,                /* src_mask */
 362          0x03ff,                /* dst_mask */
 363          TRUE),                 /* pcrel_offset */
 364
 365   /* A 8 bit absolute relocation (upper address).  */
 366   HOWTO (R_M68HC12_HI8XG,               /* type */
 367          8,                     /* rightshift */
 368          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 369          8,                     /* bitsize */
 370          FALSE,                 /* pc_relative */
 371          0,                     /* bitpos */
 372          complain_overflow_bitfield,    /* complain_on_overflow */
 373          bfd_elf_generic_reloc, /* special_function */
 374          "R_M68HC12_HI8XG",     /* name */
 375          FALSE,                 /* partial_inplace */
 376          0x00ff,                /* src_mask */
 377          0x00ff,                /* dst_mask */
 378          FALSE),                /* pcrel_offset */
 379
 380   /* A 8 bit absolute relocation (lower address).  */
 381   HOWTO (R_M68HC12_LO8XG,               /* type */
 382          8,                     /* rightshift */
 383          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 384          8,                     /* bitsize */
 385          FALSE,                 /* pc_relative */
 386          0,                     /* bitpos */
 387          complain_overflow_bitfield,    /* complain_on_overflow */
 388          bfd_elf_generic_reloc, /* special_function */
 389          "R_M68HC12_LO8XG",     /* name */
 390          FALSE,                 /* partial_inplace */
 391          0x00ff,                /* src_mask */
 392          0x00ff,                /* dst_mask */
 393          FALSE),                /* pcrel_offset */
 394
 395   /* Mark beginning of a jump instruction (any form).  */
 396   HOWTO (R_M68HC11_RL_JUMP,     /* type */
 397          0,                     /* rightshift */
 398          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 399          0,                     /* bitsize */
 400          FALSE,                 /* pc_relative */
 401          0,                     /* bitpos */
 402          complain_overflow_dont,        /* complain_on_overflow */
 403          m68hc11_elf_ignore_reloc,      /* special_function */
 404          "R_M68HC12_RL_JUMP",   /* name */
 405          TRUE,                  /* partial_inplace */
 406          0,                     /* src_mask */
 407          0,                     /* dst_mask */
 408          TRUE),                 /* pcrel_offset */
 409
 410   /* Mark beginning of Gcc relaxation group instruction.  */
 411   HOWTO (R_M68HC11_RL_GROUP,    /* type */
 412          0,                     /* rightshift */
 413          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 414          0,                     /* bitsize */
 415          FALSE,                 /* pc_relative */
 416          0,                     /* bitpos */
 417          complain_overflow_dont,        /* complain_on_overflow */
 418          m68hc11_elf_ignore_reloc,      /* special_function */
 419          "R_M68HC12_RL_GROUP",  /* name */
 420          TRUE,                  /* partial_inplace */
 421          0,                     /* src_mask */
 422          0,                     /* dst_mask */
 423          TRUE),                 /* pcrel_offset */
 424 };
 425
 426 /* Map BFD reloc types to M68HC11 ELF reloc types.  */
 427
 428 struct m68hc11_reloc_map
 429 {
 430   bfd_reloc_code_real_type bfd_reloc_val;
 431   unsigned char elf_reloc_val;
 432 };
 433
 434 static const struct m68hc11_reloc_map m68hc11_reloc_map[] =
 435 {
 436   {BFD_RELOC_NONE, R_M68HC11_NONE,},
 437   {BFD_RELOC_8, R_M68HC11_8},
 438   {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
 439   {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
 440   {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
 441   {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
 442   {BFD_RELOC_16, R_M68HC11_16},
 443   {BFD_RELOC_32, R_M68HC11_32},
 444   {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
 445
 446   {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
 447   {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
 448
 449   {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
 450   {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
 451   {BFD_RELOC_M68HC11_24, R_M68HC11_24},
 452
 453   {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
 454   {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
 455
 456   {BFD_RELOC_M68HC12_16B, R_M68HC12_16B},
 457
 458   {BFD_RELOC_M68HC12_9_PCREL, R_M68HC12_PCREL_9},
 459   {BFD_RELOC_M68HC12_10_PCREL, R_M68HC12_PCREL_10},
 460   {BFD_RELOC_M68HC12_HI8XG, R_M68HC12_HI8XG},
 461   {BFD_RELOC_M68HC12_LO8XG, R_M68HC12_LO8XG},
 462 };
 463
 464 static reloc_howto_type *
 465 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 466                                  bfd_reloc_code_real_type code)
 467 {
 468   unsigned int i;
 469
 470   for (i = 0;
 471        i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
 472        i++)
 473     {
 474       if (m68hc11_reloc_map[i].bfd_reloc_val == code)
 475         return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
 476     }
 477
 478   return NULL;
 479 }
 480
 481 static reloc_howto_type *
 482 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 483                                  const char *r_name)
 484 {
 485   unsigned int i;
 486
 487   for (i = 0;
 488        i < (sizeof (elf_m68hc11_howto_table)
 489             / sizeof (elf_m68hc11_howto_table[0]));
 490        i++)
 491     if (elf_m68hc11_howto_table[i].name != NULL
 492         && strcasecmp (elf_m68hc11_howto_table[i].name, r_name) == 0)
 493       return &elf_m68hc11_howto_table[i];
 494
 495   return NULL;
 496 }
 497
 498 /* Set the howto pointer for an M68HC11 ELF reloc.  */
 499
 500 static bfd_boolean
 501 m68hc11_info_to_howto_rel (bfd *abfd,
 502                            arelent *cache_ptr, Elf_Internal_Rela *dst)
 503 {
 504   unsigned int r_type;
 505
 506   r_type = ELF32_R_TYPE (dst->r_info);
 507   if (r_type >= (unsigned int) R_M68HC11_max)
 508     {
 509       /* xgettext:c-format */
 510       _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 511                           abfd, r_type);
 512       bfd_set_error (bfd_error_bad_value);
 513       return FALSE;
 514     }
 515   cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
 516   return TRUE;
 517 }
 518
 519 \f
 520 /* Far trampoline generation.  */
 521
 522 /* Build a 68HC12 trampoline stub.  */
 523 static bfd_boolean
 524 m68hc12_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
 525 {
 526   struct elf32_m68hc11_stub_hash_entry *stub_entry;
 527   struct bfd_link_info *info;
 528   struct m68hc11_elf_link_hash_table *htab;
 529   asection *stub_sec;
 530   bfd *stub_bfd;
 531   bfd_byte *loc;
 532   bfd_vma sym_value, phys_page, phys_addr;
 533
 534   /* Massage our args to the form they really have.  */
 535   stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
 536   info = (struct bfd_link_info *) in_arg;
 537
 538   /* Fail if the target section could not be assigned to an output
 539      section.  The user should fix his linker script.  */
 540   if (stub_entry->target_section->output_section == NULL
 541       && info->non_contiguous_regions)
 542     info->callbacks->einfo (_("%F%P: Could not assign '%pA' to an output section. "
 543                               "Retry without --enable-non-contiguous-regions.\n"),
 544                             stub_entry->target_section);
 545
 546   htab = m68hc11_elf_hash_table (info);
 547
 548   stub_sec = stub_entry->stub_sec;
 549
 550   /* Make a note of the offset within the stubs for this entry.  */
 551   stub_entry->stub_offset = stub_sec->size;
 552   stub_sec->size += 7;
 553   loc = stub_sec->contents + stub_entry->stub_offset;
 554
 555   stub_bfd = stub_sec->owner;
 556
 557   /* Create the trampoline call stub:
 558
 559      ldy #%addr(symbol)
 560      call %page(symbol), __trampoline
 561
 562   */
 563   sym_value = (stub_entry->target_value
 564                + stub_entry->target_section->output_offset
 565                + stub_entry->target_section->output_section->vma);
 566   phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
 567   phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
 568
 569   /* ldy #%page(sym) */
 570   bfd_put_8 (stub_bfd, 0xCD, loc);
 571   bfd_put_16 (stub_bfd, phys_addr, loc + 1);
 572   loc += 3;
 573
 574   /* call %page(sym), __trampoline  */
 575   bfd_put_8 (stub_bfd, 0x4a, loc);
 576   bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
 577   bfd_put_8 (stub_bfd, phys_page, loc + 3);
 578
 579   return TRUE;
 580 }
 581
 582 /* As above, but don't actually build the stub.  Just bump offset so
 583    we know stub section sizes.  */
 584
 585 static bfd_boolean
 586 m68hc12_elf_size_one_stub (struct bfd_hash_entry *gen_entry,
 587                            void *in_arg ATTRIBUTE_UNUSED)
 588 {
 589   struct elf32_m68hc11_stub_hash_entry *stub_entry;
 590
 591   /* Massage our args to the form they really have.  */
 592   stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
 593
 594   stub_entry->stub_sec->size += 7;
 595   return TRUE;
 596 }
 597
 598 /* Create a 68HC12 ELF linker hash table.  */
 599
 600 static struct bfd_link_hash_table *
 601 m68hc12_elf_bfd_link_hash_table_create (bfd *abfd)
 602 {
 603   struct m68hc11_elf_link_hash_table *ret;
 604
 605   ret = m68hc11_elf_hash_table_create (abfd);
 606   if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
 607     return NULL;
 608
 609   ret->size_one_stub = m68hc12_elf_size_one_stub;
 610   ret->build_one_stub = m68hc12_elf_build_one_stub;
 611
 612   return &ret->root.root;
 613 }
 614 \f
 615 static bfd_boolean
 616 m68hc12_elf_set_mach_from_flags (bfd *abfd)
 617 {
 618   flagword flags = elf_elfheader (abfd)->e_flags;
 619
 620   switch (flags & EF_M68HC11_MACH_MASK)
 621     {
 622     case EF_M68HC12_MACH:
 623       bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812);
 624       break;
 625     case EF_M68HCS12_MACH:
 626       bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s);
 627       break;
 628     case EF_M68HC11_GENERIC:
 629       bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12,
 630                                  bfd_mach_m6812_default);
 631       break;
 632     default:
 633       return FALSE;
 634     }
 635   return TRUE;
 636 }
 637
 638 /* Specific sections:
 639    - The .page0 is a data section that is mapped in [0x0000..0x00FF].
 640      Page0 accesses are faster on the M68HC12.
 641    - The .vectors is the section that represents the interrupt
 642      vectors.  */
 643 static const struct bfd_elf_special_section elf32_m68hc12_special_sections[] =
 644 {
 645   { STRING_COMMA_LEN (".eeprom"),   0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 646   { STRING_COMMA_LEN (".page0"),    0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 647   { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS,   SHF_ALLOC + SHF_WRITE },
 648   { STRING_COMMA_LEN (".vectors"),  0, SHT_PROGBITS, SHF_ALLOC },
 649   { NULL,                       0,  0, 0,            0 }
 650 };
 651 \f
 652 #define ELF_ARCH                bfd_arch_m68hc12
 653 #define ELF_TARGET_ID           M68HC11_ELF_DATA
 654 #define ELF_MACHINE_CODE        EM_68HC12
 655 #define ELF_MAXPAGESIZE         0x1000
 656
 657 #define TARGET_BIG_SYM          m68hc12_elf32_vec
 658 #define TARGET_BIG_NAME         "elf32-m68hc12"
 659
 660 #define elf_info_to_howto       NULL
 661 #define elf_info_to_howto_rel   m68hc11_info_to_howto_rel
 662 #define elf_backend_check_relocs     elf32_m68hc11_check_relocs
 663 #define elf_backend_relocate_section elf32_m68hc11_relocate_section
 664 #define elf_backend_object_p            m68hc12_elf_set_mach_from_flags
 665 #define elf_backend_can_gc_sections             1
 666 #define elf_backend_special_sections elf32_m68hc12_special_sections
 667 #define elf_backend_init_file_header     elf32_m68hc11_init_file_header
 668 #define elf_backend_add_symbol_hook  elf32_m68hc11_add_symbol_hook
 669 #define elf_backend_merge_symbol_attribute elf32_m68hc11_merge_symbol_attribute
 670
 671 #define bfd_elf32_bfd_link_hash_table_create \
 672                                 m68hc12_elf_bfd_link_hash_table_create
 673 #define bfd_elf32_bfd_merge_private_bfd_data \
 674                                         _bfd_m68hc11_elf_merge_private_bfd_data
 675 #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
 676 #define bfd_elf32_bfd_print_private_bfd_data \
 677                                         _bfd_m68hc11_elf_print_private_bfd_data
 678
 679 #include "elf32-target.h"