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 "libbfd.h"
  24 #include "obstack.h"
  25 #include "coff/h8300.h"
  26 #include "coff/internal.h"
  27 #include "seclet.h"
  28 #include "libcoff.h"
  29 extern bfd_error_vector_type bfd_error_vector;
  30
  31 static reloc_howto_type howto_table[] =
  32 {
  33   HOWTO (R_RELBYTE, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "8", true, 0x000000ff, 0x000000ff, false),
  34   HOWTO (R_RELWORD, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16", true, 0x0000ffff, 0x0000ffff, false),
  35   HOWTO (R_RELLONG, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, "32", true, 0xffffffff, 0xffffffff, false),
  36   HOWTO (R_PCRBYTE, 0, 0, 8, true, 0, complain_overflow_signed, 0, "DISP8", true, 0x000000ff, 0x000000ff, true),
  37   HOWTO (R_PCRWORD, 0, 1, 16, true, 0, complain_overflow_signed, 0, "DISP16", true, 0x0000ffff, 0x0000ffff, true),
  38   HOWTO (R_PCRLONG, 0, 2, 32, true, 0, complain_overflow_signed, 0, "DISP32", true, 0xffffffff, 0xffffffff, true),
  39   HOWTO (R_MOVB1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16/8", true, 0x0000ffff, 0x0000ffff, false),
  40   HOWTO (R_MOVB2, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "8/16", true, 0x0000ffff, 0x0000ffff, false),
  41   HOWTO (R_JMP1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16/pcrel", true, 0x0000ffff, 0x0000ffff, false),
  42   HOWTO (R_JMP2, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pcrecl/16", true, 0x000000ff, 0x000000ff, false),
  43
  44
  45   HOWTO (R_JMPL1, 0, 1, 32, false, 0, complain_overflow_bitfield, 0, "24/pcrell", true, 0x0000ffff, 0x0000ffff, false),
  46   HOWTO (R_JMPL_B8, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pc8/24", true, 0x000000ff, 0x000000ff, false),
  47
  48   HOWTO (R_MOVLB1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "24/8", true, 0x0000ffff, 0x0000ffff, false),
  49   HOWTO (R_MOVLB2, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "8/24", true, 0x0000ffff, 0x0000ffff, false),
  50
  51 };
  52
  53
  54 /* Turn a howto into a reloc number */
  55
  56 #define SELECT_RELOC(x,howto) \
  57   { x = select_reloc(howto); }
  58
  59 #define BADMAG(x) (H8300BADMAG(x)&& H8300HBADMAG(x))
  60 #define H8300 1                 /* Customize coffcode.h */
  61 #define __A_MAGIC_SET__
  62
  63
  64
  65 /* Code to swap in the reloc */
  66 #define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
  67 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
  68 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  69   dst->r_stuff[0] = 'S'; \
  70   dst->r_stuff[1] = 'C';
  71
  72
  73 static int
  74 select_reloc (howto)
  75      reloc_howto_type *howto;
  76 {
  77   return howto->type;
  78 }
  79
  80 /* Code to turn a r_type into a howto ptr, uses the above howto table
  81    */
  82
  83 static void
  84 rtype2howto (internal, dst)
  85      arelent *internal;
  86      struct internal_reloc *dst;
  87 {
  88   switch (dst->r_type)
  89     {
  90     case R_RELBYTE:
  91       internal->howto = howto_table + 0;
  92       break;
  93     case R_RELWORD:
  94       internal->howto = howto_table + 1;
  95       break;
  96     case R_RELLONG:
  97       internal->howto = howto_table + 2;
  98       break;
  99     case R_PCRBYTE:
 100       internal->howto = howto_table + 3;
 101       break;
 102     case R_PCRWORD:
 103       internal->howto = howto_table + 4;
 104       break;
 105     case R_PCRLONG:
 106       internal->howto = howto_table + 5;
 107       break;
 108     case R_MOVB1:
 109       internal->howto = howto_table + 6;
 110       break;
 111     case R_MOVB2:
 112       internal->howto = howto_table + 7;
 113       break;
 114     case R_JMP1:
 115       internal->howto = howto_table + 8;
 116       break;
 117     case R_JMP2:
 118       internal->howto = howto_table + 9;
 119       break;
 120     case R_JMPL1:
 121       internal->howto = howto_table + 10;
 122       break;
 123     case R_JMPL_B8:
 124       internal->howto = howto_table + 11;
 125       break;
 126     case R_MOVLB1:
 127       internal->howto = howto_table + 12;
 128       break;
 129     case R_MOVLB2:
 130       internal->howto = howto_table + 13;
 131       break;
 132     default:
 133       fprintf (stderr, "Bad reloc\n");
 134       break;
 135     }
 136 }
 137
 138 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
 139
 140
 141 /* Perform any necessaru magic to the addend in a reloc entry */
 142
 143
 144 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 145  cache_ptr->addend =  ext_reloc.r_offset;
 146
 147
 148 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 149  reloc_processing(relent, reloc, symbols, abfd, section)
 150
 151 static void
 152 DEFUN (reloc_processing, (relent, reloc, symbols, abfd, section),
 153        arelent * relent AND
 154        struct internal_reloc *reloc AND
 155        asymbol ** symbols AND
 156        bfd * abfd AND
 157        asection * section)
 158 {
 159   relent->address = reloc->r_vaddr;
 160   rtype2howto (relent, reloc);
 161
 162   if (((int) reloc->r_symndx) > 0)
 163     {
 164       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 165     }
 166   else
 167     {
 168       relent->sym_ptr_ptr = &(bfd_abs_symbol);
 169     }
 170
 171
 172
 173   relent->addend = reloc->r_offset;
 174
 175   relent->address -= section->vma;
 176   /*  relent->section = 0;*/
 177 }
 178
 179
 180 static int
 181 h8300_reloc16_estimate(input_section, symbols, reloc, shrink)
 182      asection *input_section;
 183      asymbol **symbols;
 184      arelent *reloc;
 185      unsigned int shrink;
 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,0);
 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, 0);
 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, 0);
 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, seclet, reloc, data, src_ptr, dst_ptr)
 300      bfd *abfd;
 301      struct bfd_seclet *seclet;
 302      arelent *reloc;
 303      bfd_byte *data;
 304      unsigned int *src_ptr;
 305      unsigned int *dst_ptr;
 306 {
 307   unsigned int src_address = *src_ptr;
 308   unsigned int dst_address = *dst_ptr;
 309
 310   switch (reloc->howto->type)
 311     {
 312       /* A 24 bit branch which could be a 8 bit pcrel, really pointing to
 313          the byte before the 24bit hole, so we can treat it as a 32bit pointer */
 314     case R_PCRBYTE:
 315       {
 316         bfd_vma dot = seclet->offset
 317           + dst_address
 318             + seclet->u.indirect.section->output_section->vma;
 319         int gap = bfd_coff_reloc16_get_value (reloc, seclet) - dot;
 320         if (gap > 127 || gap < -128)
 321           {
 322             bfd_error_vector.reloc_value_truncated (reloc, seclet);
 323           }
 324
 325         bfd_put_8 (abfd, gap, data + dst_address);
 326         dst_address++;
 327         src_address++;
 328
 329         break;
 330       }
 331
 332     case R_RELBYTE:
 333       {
 334         unsigned int gap = bfd_coff_reloc16_get_value (reloc, seclet);
 335         if (gap > 0xff && gap < ~0xff)
 336           {
 337             bfd_error_vector.reloc_value_truncated (reloc, seclet);
 338           }
 339
 340         bfd_put_8 (abfd, gap, data + dst_address);
 341         dst_address += 1;
 342         src_address += 1;
 343
 344
 345       }
 346       break;
 347     case R_JMP1:
 348       /* A relword which would have like to have been a pcrel */
 349     case R_MOVB1:
 350       /* A relword which would like to have been modified but
 351              didn't make it */
 352     case R_RELWORD:
 353       bfd_put_16 (abfd, bfd_coff_reloc16_get_value (reloc, seclet),
 354                   data + dst_address);
 355       dst_address += 2;
 356       src_address += 2;
 357       break;
 358     case R_RELLONG:
 359       bfd_put_32 (abfd, bfd_coff_reloc16_get_value (reloc, seclet),
 360                   data + dst_address);
 361       dst_address += 4;
 362       src_address += 4;
 363       break;
 364
 365     case R_MOVB2:
 366       /* Special relaxed type, there will be a gap between where we
 367              get stuff from and where we put stuff to now
 368
 369              for a mov.b @aa:16 -> mov.b @aa:8
 370              opcode 0x6a 0x0y offset
 371              ->     0x2y off
 372              */
 373       if (data[dst_address - 1] != 0x6a)
 374         abort ();
 375       switch (data[src_address] & 0xf0)
 376         {
 377         case 0x00:
 378           /* Src is memory */
 379           data[dst_address - 1] = (data[src_address] & 0xf) | 0x20;
 380           break;
 381         case 0x80:
 382           /* Src is reg */
 383           data[dst_address - 1] = (data[src_address] & 0xf) | 0x30;
 384           break;
 385         default:
 386           abort ();
 387         }
 388
 389       /* the offset must fit ! after all, what was all the relaxing
 390              about ? */
 391
 392       bfd_put_8 (abfd, bfd_coff_reloc16_get_value (reloc, seclet),
 393                  data + dst_address);
 394
 395       /* Note the magic - src goes up by two bytes, but dst by only
 396              one */
 397       dst_address += 1;
 398       src_address += 3;
 399
 400       break;
 401
 402     case R_JMP2:
 403
 404       /* Speciial relaxed type */
 405       {
 406         bfd_vma dot = seclet->offset
 407         + dst_address
 408         + seclet->u.indirect.section->output_section->vma;
 409
 410         int gap = bfd_coff_reloc16_get_value (reloc, seclet) - dot - 1;
 411
 412         if ((gap & ~0xff) != 0 && ((gap & 0xff00) != 0xff00))
 413           abort ();
 414
 415         bfd_put_8 (abfd, gap, data + dst_address);
 416
 417         switch (data[dst_address - 1])
 418           {
 419           case 0x5e:
 420             /* jsr -> bsr */
 421             bfd_put_8 (abfd, 0x55, data + dst_address - 1);
 422             break;
 423           case 0x5a:
 424             /* jmp ->bra */
 425             bfd_put_8 (abfd, 0x40, data + dst_address - 1);
 426             break;
 427
 428           default:
 429             abort ();
 430           }
 431         dst_address++;
 432         src_address += 3;
 433
 434         break;
 435       }
 436       break;
 437
 438     case R_JMPL_B8: /* 24 bit branch which is now 8 bits */
 439
 440       /* Speciial relaxed type */
 441       {
 442         bfd_vma dot = seclet->offset
 443         + dst_address
 444         + seclet->u.indirect.section->output_section->vma;
 445
 446         int gap = bfd_coff_reloc16_get_value (reloc, seclet) - dot - 2;
 447
 448         if ((gap & ~0xff) != 0 && ((gap & 0xff00) != 0xff00))
 449           abort ();
 450
 451         switch (data[src_address])
 452           {
 453           case 0x5e:
 454             /* jsr -> bsr */
 455             bfd_put_8 (abfd, 0x55, data + dst_address);
 456             break;
 457           case 0x5a:
 458             /* jmp ->bra */
 459             bfd_put_8 (abfd, 0x40, data + dst_address);
 460             break;
 461
 462           default:
 463             bfd_put_8 (abfd, 0xde, data + dst_address);
 464             break;
 465           }
 466
 467         bfd_put_8 (abfd, gap, data + dst_address + 1);
 468         dst_address += 2;
 469         src_address += 4;
 470
 471         break;
 472       }
 473
 474     case R_JMPL1:
 475       {
 476         int v = bfd_coff_reloc16_get_value (reloc, seclet);
 477         int o = bfd_get_32 (abfd, data + src_address);
 478         v = (v & 0x00ffffff) | (o & 0xff000000);
 479         bfd_put_32 (abfd, v, data + dst_address);
 480         dst_address += 4;
 481         src_address += 4;
 482       }
 483
 484       break;
 485
 486
 487       /* A 24 bit mov  which could be an 8 bit move, really pointing to
 488          the byte before the 24bit hole, so we can treat it as a 32bit pointer */
 489     case R_MOVLB1:
 490       {
 491         int v = bfd_coff_reloc16_get_value (reloc, seclet);
 492         int o = bfd_get_32 (abfd, data + dst_address);
 493         v = (v & 0x00ffffff) | (o & 0xff000000);
 494         bfd_put_32 (abfd, v, data + dst_address);
 495         dst_address += 4;
 496         src_address += 4;
 497       }
 498
 499       break;
 500     default:
 501
 502       abort ();
 503       break;
 504
 505     }
 506   *src_ptr = src_address;
 507   *dst_ptr = dst_address;
 508
 509 }
 510
 511 #define coff_reloc16_extra_cases h8300_reloc16_extra_cases
 512 #define coff_reloc16_estimate h8300_reloc16_estimate
 513
 514 #include "coffcode.h"
 515
 516
 517 #undef coff_bfd_get_relocated_section_contents
 518 #undef coff_bfd_relax_section
 519 #define  coff_bfd_get_relocated_section_contents bfd_coff_reloc16_get_relocated_section_contents
 520 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 521
 522
 523
 524 bfd_target h8300coff_vec =
 525 {
 526   "coff-h8300",                 /* name */
 527   bfd_target_coff_flavour,
 528   true,                         /* data byte order is big */
 529   true,                         /* header byte order is big */
 530
 531   (HAS_RELOC | EXEC_P |         /* object flags */
 532    HAS_LINENO | HAS_DEBUG |
 533    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 534   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC),        /* section flags */
 535   '_',                          /* leading char */
 536   '/',                          /* ar_pad_char */
 537   15,                           /* ar_max_namelen */
 538   1,                            /* minimum section alignment */
 539   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 540   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 541   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* data */
 542   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 543   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 544   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* hdrs */
 545
 546   {_bfd_dummy_target, coff_object_p,    /* bfd_check_format */
 547    bfd_generic_archive_p, _bfd_dummy_target},
 548   {bfd_false, coff_mkobject, _bfd_generic_mkarchive,    /* bfd_set_format */
 549    bfd_false},
 550   {bfd_false, coff_write_object_contents,       /* bfd_write_contents */
 551    _bfd_write_archive_contents, bfd_false},
 552
 553   JUMP_TABLE (coff),
 554   COFF_SWAP_TABLE,
 555 };