bfd/coff-h8300.c

   1 /* BFD back-end for Hitachi H8/300 COFF binaries.
   2    Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
   3    Written by Steve Chamberlain, <sac@cygnus.com>.
   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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "obstack.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "coff/h8300.h"
  27 #include "coff/internal.h"
  28 #include "libcoff.h"
  29
  30 static reloc_howto_type howto_table[] =
  31 {
  32   HOWTO (R_RELBYTE, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "8", true, 0x000000ff, 0x000000ff, false),
  33   HOWTO (R_RELWORD, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16", true, 0x0000ffff, 0x0000ffff, false),
  34   HOWTO (R_RELLONG, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, "32", true, 0xffffffff, 0xffffffff, false),
  35   HOWTO (R_PCRBYTE, 0, 0, 8, true, 0, complain_overflow_signed, 0, "DISP8", true, 0x000000ff, 0x000000ff, true),
  36   HOWTO (R_PCRWORD, 0, 1, 16, true, 0, complain_overflow_signed, 0, "DISP16", true, 0x0000ffff, 0x0000ffff, true),
  37   HOWTO (R_PCRLONG, 0, 2, 32, true, 0, complain_overflow_signed, 0, "DISP32", true, 0xffffffff, 0xffffffff, true),
  38   HOWTO (R_MOVB1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16/8", true, 0x0000ffff, 0x0000ffff, false),
  39   HOWTO (R_MOVB2, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "8/16", true, 0x0000ffff, 0x0000ffff, false),
  40   HOWTO (R_JMP1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16/pcrel", true, 0x0000ffff, 0x0000ffff, false),
  41   HOWTO (R_JMP2, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pcrecl/16", true, 0x000000ff, 0x000000ff, false),
  42
  43
  44   HOWTO (R_JMPL1, 0, 1, 32, false, 0, complain_overflow_bitfield, 0, "24/pcrell", true, 0x0000ffff, 0x0000ffff, false),
  45   HOWTO (R_JMPL_B8, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pc8/24", true, 0x000000ff, 0x000000ff, false),
  46
  47   HOWTO (R_MOVLB1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "24/8", true, 0x0000ffff, 0x0000ffff, false),
  48   HOWTO (R_MOVLB2, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "8/24", true, 0x0000ffff, 0x0000ffff, false),
  49
  50 };
  51
  52
  53 /* Turn a howto into a reloc number */
  54
  55 #define SELECT_RELOC(x,howto) \
  56   { x = select_reloc(howto); }
  57
  58 #define BADMAG(x) (H8300BADMAG(x)&& H8300HBADMAG(x))
  59 #define H8300 1                 /* Customize coffcode.h */
  60 #define __A_MAGIC_SET__
  61
  62
  63
  64 /* Code to swap in the reloc */
  65 #define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
  66 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
  67 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  68   dst->r_stuff[0] = 'S'; \
  69   dst->r_stuff[1] = 'C';
  70
  71
  72 static int
  73 select_reloc (howto)
  74      reloc_howto_type *howto;
  75 {
  76   return howto->type;
  77 }
  78
  79 /* Code to turn a r_type into a howto ptr, uses the above howto table
  80    */
  81
  82 static void
  83 rtype2howto (internal, dst)
  84      arelent *internal;
  85      struct internal_reloc *dst;
  86 {
  87   switch (dst->r_type)
  88     {
  89     case R_RELBYTE:
  90       internal->howto = howto_table + 0;
  91       break;
  92     case R_RELWORD:
  93       internal->howto = howto_table + 1;
  94       break;
  95     case R_RELLONG:
  96       internal->howto = howto_table + 2;
  97       break;
  98     case R_PCRBYTE:
  99       internal->howto = howto_table + 3;
 100       break;
 101     case R_PCRWORD:
 102       internal->howto = howto_table + 4;
 103       break;
 104     case R_PCRLONG:
 105       internal->howto = howto_table + 5;
 106       break;
 107     case R_MOVB1:
 108       internal->howto = howto_table + 6;
 109       break;
 110     case R_MOVB2:
 111       internal->howto = howto_table + 7;
 112       break;
 113     case R_JMP1:
 114       internal->howto = howto_table + 8;
 115       break;
 116     case R_JMP2:
 117       internal->howto = howto_table + 9;
 118       break;
 119     case R_JMPL1:
 120       internal->howto = howto_table + 10;
 121       break;
 122     case R_JMPL_B8:
 123       internal->howto = howto_table + 11;
 124       break;
 125     case R_MOVLB1:
 126       internal->howto = howto_table + 12;
 127       break;
 128     case R_MOVLB2:
 129       internal->howto = howto_table + 13;
 130       break;
 131     default:
 132       fprintf (stderr, "Bad reloc\n");
 133       break;
 134     }
 135 }
 136
 137 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
 138
 139
 140 /* Perform any necessaru magic to the addend in a reloc entry */
 141
 142
 143 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 144  cache_ptr->addend =  ext_reloc.r_offset;
 145
 146
 147 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 148  reloc_processing(relent, reloc, symbols, abfd, section)
 149
 150 static void
 151 DEFUN (reloc_processing, (relent, reloc, symbols, abfd, section),
 152        arelent * relent AND
 153        struct internal_reloc *reloc AND
 154        asymbol ** symbols AND
 155        bfd * abfd AND
 156        asection * section)
 157 {
 158   relent->address = reloc->r_vaddr;
 159   rtype2howto (relent, reloc);
 160
 161   if (((int) reloc->r_symndx) > 0)
 162     {
 163       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 164     }
 165   else
 166     {
 167       relent->sym_ptr_ptr = &(bfd_abs_symbol);
 168     }
 169
 170
 171
 172   relent->addend = reloc->r_offset;
 173
 174   relent->address -= section->vma;
 175   /*  relent->section = 0;*/
 176 }
 177
 178
 179 static int
 180 h8300_reloc16_estimate(input_section, symbols, reloc, shrink, link_info)
 181      asection *input_section;
 182      asymbol **symbols;
 183      arelent *reloc;
 184      unsigned int shrink;
 185      struct bfd_link_info *link_info;
 186 {
 187   bfd_vma value;
 188   bfd_vma dot;
 189   bfd_vma gap;
 190
 191   /* The address of the thing to be relocated will have moved back by
 192    the size of the shrink  - but we don't change reloc->address here,
 193    since we need it to know where the relocation lives in the source
 194    uncooked section */
 195
 196   /*  reloc->address -= shrink;   conceptual */
 197
 198   bfd_vma address = reloc->address - shrink;
 199
 200
 201   switch (reloc->howto->type)
 202     {
 203     case R_MOVB2:
 204     case R_JMP2:
 205       shrink+=2;
 206       break;
 207
 208       /* Thing is a move one byte */
 209     case R_MOVB1:
 210       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 211
 212       if (value >= 0xff00)
 213         {
 214
 215           /* Change the reloc type from 16bit, possible 8 to 8bit
 216              possible 16 */
 217           reloc->howto = reloc->howto + 1;
 218           /* The place to relc moves back by one */
 219           /* This will be two bytes smaller in the long run */
 220           shrink +=2 ;
 221           bfd_perform_slip(symbols, 2, input_section, address);
 222         }
 223
 224       break;
 225       /* This is the 24 bit branch which could become an 8 bitter,
 226        the relocation points to the first byte of the insn, not the
 227        actual data */
 228
 229     case R_JMPL1:
 230       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 231
 232       dot = input_section->output_section->vma +
 233         input_section->output_offset + address;
 234
 235       /* See if the address we're looking at within 127 bytes of where
 236          we are, if so then we can use a small branch rather than the
 237          jump we were going to */
 238
 239       gap = value - dot ;
 240
 241       if (-120 < (long)gap && (long)gap < 120 )
 242         {
 243
 244           /* Change the reloc type from 24bit, possible 8 to 8bit
 245              possible 32 */
 246           reloc->howto = reloc->howto + 1;
 247           /* This will be two bytes smaller in the long run */
 248           shrink +=2 ;
 249           bfd_perform_slip(symbols, 2, input_section, address);
 250         }
 251       break;
 252
 253     case R_JMP1:
 254
 255       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 256
 257       dot = input_section->output_section->vma +
 258         input_section->output_offset + address;
 259
 260       /* See if the address we're looking at within 127 bytes of where
 261          we are, if so then we can use a small branch rather than the
 262          jump we were going to */
 263
 264       gap = value - (dot - shrink);
 265
 266
 267       if (-120 < (long)gap && (long)gap < 120 )
 268         {
 269
 270           /* Change the reloc type from 16bit, possible 8 to 8bit
 271              possible 16 */
 272           reloc->howto = reloc->howto + 1;
 273           /* The place to relc moves back by one */
 274
 275           /* This will be two bytes smaller in the long run */
 276           shrink +=2 ;
 277           bfd_perform_slip(symbols, 2, input_section, address);
 278         }
 279       break;
 280     }
 281
 282
 283   return shrink;
 284 }
 285
 286
 287 /* First phase of a relaxing link */
 288
 289 /* Reloc types
 290    large                small
 291    R_MOVB1              R_MOVB2         mov.b with 16bit or 8 bit address
 292    R_JMP1               R_JMP2          jmp or pcrel branch
 293    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 294    R_MOVLB1             R_MOVLB2        24 or 8 bit reloc for mov.b
 295
 296 */
 297
 298 static void
 299 h8300_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
 300                            dst_ptr)
 301      bfd *abfd;
 302      struct bfd_link_info *link_info;
 303      struct bfd_link_order *link_order;
 304      arelent *reloc;
 305      bfd_byte *data;
 306      unsigned int *src_ptr;
 307      unsigned int *dst_ptr;
 308 {
 309   unsigned int src_address = *src_ptr;
 310   unsigned int dst_address = *dst_ptr;
 311   asection *input_section = link_order->u.indirect.section;
 312
 313   switch (reloc->howto->type)
 314     {
 315       /* A 24 bit branch which could be a 8 bit pcrel, really pointing to
 316          the byte before the 24bit hole, so we can treat it as a 32bit pointer */
 317     case R_PCRBYTE:
 318       {
 319         bfd_vma dot = link_order->offset
 320           + dst_address
 321             + link_order->u.indirect.section->output_section->vma;
 322         int gap = (bfd_coff_reloc16_get_value (reloc, link_info, input_section)
 323                    - dot);
 324         if (gap > 127 || gap < -128)
 325           {
 326             if (! ((*link_info->callbacks->reloc_overflow)
 327                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 328                     reloc->howto->name, reloc->addend, input_section->owner,
 329                     input_section, reloc->address)))
 330               abort ();
 331           }
 332
 333         bfd_put_8 (abfd, gap, data + dst_address);
 334         dst_address++;
 335         src_address++;
 336
 337         break;
 338       }
 339
 340     case R_RELBYTE:
 341       {
 342         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 343                                                        input_section);
 344         if (gap > 0xff && gap < ~0xff)
 345           {
 346             if (! ((*link_info->callbacks->reloc_overflow)
 347                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 348                     reloc->howto->name, reloc->addend, input_section->owner,
 349                     input_section, reloc->address)))
 350               abort ();
 351           }
 352
 353         bfd_put_8 (abfd, gap, data + dst_address);
 354         dst_address += 1;
 355         src_address += 1;
 356
 357
 358       }
 359       break;
 360     case R_JMP1:
 361       /* A relword which would have like to have been a pcrel */
 362     case R_MOVB1:
 363       /* A relword which would like to have been modified but
 364              didn't make it */
 365     case R_RELWORD:
 366       bfd_put_16 (abfd,
 367                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 368                   data + dst_address);
 369       dst_address += 2;
 370       src_address += 2;
 371       break;
 372     case R_RELLONG:
 373       bfd_put_32 (abfd,
 374                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 375                   data + dst_address);
 376       dst_address += 4;
 377       src_address += 4;
 378       break;
 379
 380     case R_MOVB2:
 381       /* Special relaxed type, there will be a gap between where we
 382              get stuff from and where we put stuff to now
 383
 384              for a mov.b @aa:16 -> mov.b @aa:8
 385              opcode 0x6a 0x0y offset
 386              ->     0x2y off
 387              */
 388       if (data[dst_address - 1] != 0x6a)
 389         abort ();
 390       switch (data[src_address] & 0xf0)
 391         {
 392         case 0x00:
 393           /* Src is memory */
 394           data[dst_address - 1] = (data[src_address] & 0xf) | 0x20;
 395           break;
 396         case 0x80:
 397           /* Src is reg */
 398           data[dst_address - 1] = (data[src_address] & 0xf) | 0x30;
 399           break;
 400         default:
 401           abort ();
 402         }
 403
 404       /* the offset must fit ! after all, what was all the relaxing
 405              about ? */
 406
 407       bfd_put_8 (abfd,
 408                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 409                  data + dst_address);
 410
 411       /* Note the magic - src goes up by two bytes, but dst by only
 412              one */
 413       dst_address += 1;
 414       src_address += 3;
 415
 416       break;
 417
 418     case R_JMP2:
 419
 420       /* Speciial relaxed type */
 421       {
 422         bfd_vma dot = link_order->offset
 423         + dst_address
 424         + link_order->u.indirect.section->output_section->vma;
 425
 426         int gap = (bfd_coff_reloc16_get_value (reloc, link_info, input_section)
 427                    - dot - 1);
 428
 429         if ((gap & ~0xff) != 0 && ((gap & 0xff00) != 0xff00))
 430           abort ();
 431
 432         bfd_put_8 (abfd, gap, data + dst_address);
 433
 434         switch (data[dst_address - 1])
 435           {
 436           case 0x5e:
 437             /* jsr -> bsr */
 438             bfd_put_8 (abfd, 0x55, data + dst_address - 1);
 439             break;
 440           case 0x5a:
 441             /* jmp ->bra */
 442             bfd_put_8 (abfd, 0x40, data + dst_address - 1);
 443             break;
 444
 445           default:
 446             abort ();
 447           }
 448         dst_address++;
 449         src_address += 3;
 450
 451         break;
 452       }
 453       break;
 454
 455     case R_JMPL_B8: /* 24 bit branch which is now 8 bits */
 456
 457       /* Speciial relaxed type */
 458       {
 459         bfd_vma dot = link_order->offset
 460         + dst_address
 461         + link_order->u.indirect.section->output_section->vma;
 462
 463         int gap = (bfd_coff_reloc16_get_value (reloc, link_info, input_section)
 464                    - dot - 2);
 465
 466         if ((gap & ~0xff) != 0 && ((gap & 0xff00) != 0xff00))
 467           abort ();
 468
 469         switch (data[src_address])
 470           {
 471           case 0x5e:
 472             /* jsr -> bsr */
 473             bfd_put_8 (abfd, 0x55, data + dst_address);
 474             break;
 475           case 0x5a:
 476             /* jmp ->bra */
 477             bfd_put_8 (abfd, 0x40, data + dst_address);
 478             break;
 479
 480           default:
 481             bfd_put_8 (abfd, 0xde, data + dst_address);
 482             break;
 483           }
 484
 485         bfd_put_8 (abfd, gap, data + dst_address + 1);
 486         dst_address += 2;
 487         src_address += 4;
 488
 489         break;
 490       }
 491
 492     case R_JMPL1:
 493       {
 494         int v = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 495         int o = bfd_get_32 (abfd, data + src_address);
 496         v = (v & 0x00ffffff) | (o & 0xff000000);
 497         bfd_put_32 (abfd, v, data + dst_address);
 498         dst_address += 4;
 499         src_address += 4;
 500       }
 501
 502       break;
 503
 504
 505       /* A 24 bit mov  which could be an 8 bit move, really pointing to
 506          the byte before the 24bit hole, so we can treat it as a 32bit pointer */
 507     case R_MOVLB1:
 508       {
 509         int v = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 510         int o = bfd_get_32 (abfd, data + dst_address);
 511         v = (v & 0x00ffffff) | (o & 0xff000000);
 512         bfd_put_32 (abfd, v, data + dst_address);
 513         dst_address += 4;
 514         src_address += 4;
 515       }
 516
 517       break;
 518     default:
 519
 520       abort ();
 521       break;
 522
 523     }
 524   *src_ptr = src_address;
 525   *dst_ptr = dst_address;
 526
 527 }
 528
 529 #define coff_reloc16_extra_cases h8300_reloc16_extra_cases
 530 #define coff_reloc16_estimate h8300_reloc16_estimate
 531
 532 #include "coffcode.h"
 533
 534
 535 #undef coff_bfd_get_relocated_section_contents
 536 #undef coff_bfd_relax_section
 537 #define coff_bfd_get_relocated_section_contents \
 538   bfd_coff_reloc16_get_relocated_section_contents
 539 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 540
 541
 542
 543 bfd_target h8300coff_vec =
 544 {
 545   "coff-h8300",                 /* name */
 546   bfd_target_coff_flavour,
 547   true,                         /* data byte order is big */
 548   true,                         /* header byte order is big */
 549
 550   (HAS_RELOC | EXEC_P |         /* object flags */
 551    HAS_LINENO | HAS_DEBUG |
 552    HAS_SYMS | HAS_LOCALS | WP_TEXT | BFD_IS_RELAXABLE ),
 553   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC),        /* section flags */
 554   '_',                          /* leading char */
 555   '/',                          /* ar_pad_char */
 556   15,                           /* ar_max_namelen */
 557   1,                            /* minimum section alignment */
 558   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 559   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 560   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* data */
 561   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 562   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 563   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* hdrs */
 564
 565   {_bfd_dummy_target, coff_object_p,    /* bfd_check_format */
 566    bfd_generic_archive_p, _bfd_dummy_target},
 567   {bfd_false, coff_mkobject, _bfd_generic_mkarchive,    /* bfd_set_format */
 568    bfd_false},
 569   {bfd_false, coff_write_object_contents,       /* bfd_write_contents */
 570    _bfd_write_archive_contents, bfd_false},
 571
 572   JUMP_TABLE (coff),
 573   COFF_SWAP_TABLE,
 574 };