bfd/cpu-ns32k.c

   1 /* BFD support for the ns32k architecture.
   2    Copyright (C) 1990, 91, 94, 95, 96, 98, 1999 Free Software Foundation, Inc.
   3    Almost totally rewritten by Ian Dall from initial work
   4    by Andrew Cagney.
   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 "ns32k.h"
  26
  27 #define N(machine, printable, d, next)  \
  28 {  32, 32, 8, bfd_arch_ns32k, machine, "ns32k",printable,3,d,bfd_default_compatible,bfd_default_scan, next, }
  29
  30 static const bfd_arch_info_type arch_info_struct[] =
  31 {
  32   N(32532,"ns32k:32532",true, 0), /* the word ns32k will match this too */
  33 };
  34
  35 const bfd_arch_info_type bfd_ns32k_arch =
  36   N(32032,"ns32k:32032",false, &arch_info_struct[0]);
  37
  38 static long
  39 ns32k_sign_extend(value, bits)
  40      int value;
  41      int bits;
  42 {
  43   value = value & ((1 << bits) - 1);
  44   return (value & (1 << (bits-1))
  45           ? value | (~((1 << bits) - 1))
  46           : value);
  47 }
  48
  49 long
  50 _bfd_ns32k_get_displacement(buffer, offset, size)
  51      bfd_byte *buffer;
  52      long offset;
  53      long size;
  54 {
  55   long value;
  56   buffer += offset;
  57   switch (size)
  58     {
  59     case 1:
  60       value = ns32k_sign_extend (*buffer, 7);
  61       break;
  62     case 2:
  63       value = ns32k_sign_extend(*buffer++, 6);
  64       value = (value << 8) | (0xff & *buffer);
  65       break;
  66     case 4:
  67       value = ns32k_sign_extend(*buffer++, 6);
  68       value = (value << 8) | (0xff & *buffer++);
  69       value = (value << 8) | (0xff & *buffer++);
  70       value = (value << 8) | (0xff & *buffer);
  71       break;
  72     default:
  73       abort ();
  74       return 0;
  75     }
  76   return value;
  77 }
  78
  79 int
  80 _bfd_ns32k_put_displacement(value, buffer, offset, size)
  81      long value;
  82      bfd_byte *buffer;
  83      long offset;
  84      long size;
  85 {
  86   buffer += offset;
  87   switch (size)
  88     {
  89     case 1:
  90       if (value < -64 || value > 63)
  91         return -1;
  92       value&=0x7f;
  93       *buffer++=value;
  94       break;
  95     case 2:
  96       if (value < -8192 || value > 8191)
  97         return -1;
  98       value&=0x3fff;
  99       value|=0x8000;
 100       *buffer++=(value>>8);
 101       *buffer++=value;
 102       break;
 103     case 4:
 104       if (value < -0x1f000000 || value >= 0x20000000)
 105         return -1;
 106       value|=0xc0000000;
 107       *buffer++=(value>>24);
 108       *buffer++=(value>>16);
 109       *buffer++=(value>>8);
 110       *buffer++=value;
 111       break;
 112     default:
 113       return -1;
 114   }
 115   return 0;
 116 }
 117
 118 long
 119 _bfd_ns32k_get_immediate (buffer, offset, size)
 120      bfd_byte *buffer;
 121      long offset;
 122      long size;
 123 {
 124   long value = 0;
 125   buffer += offset;
 126   switch (size)
 127     {
 128     case 4:
 129       value = (value << 8) | (*buffer++ & 0xff);
 130     case 3:
 131       value = (value << 8) | (*buffer++ & 0xff);
 132     case 2:
 133       value = (value << 8) | (*buffer++ & 0xff);
 134     case 1:
 135       value = (value << 8) | (*buffer++ & 0xff);
 136     }
 137   return value;
 138 }
 139
 140 int
 141 _bfd_ns32k_put_immediate (value, buffer, offset, size)
 142      long value;
 143      bfd_byte *buffer;
 144      long offset;
 145      long size;
 146 {
 147   buffer += offset + size - 1;
 148   switch (size)
 149     {
 150     case 4:
 151       *buffer-- = (value & 0xff); value >>= 8;
 152     case 3:
 153       *buffer-- = (value & 0xff); value >>= 8;
 154     case 2:
 155       *buffer-- = (value & 0xff); value >>= 8;
 156     case 1:
 157       *buffer-- = (value & 0xff); value >>= 8;
 158     }
 159   return 0;
 160 }
 161
 162 /* This is just like the standard perform_relocation except we
 163  * use get_data and put_data which know about the ns32k
 164  * storage methods.
 165  * This is probably a lot more complicated than it needs to be!
 166  */
 167 static bfd_reloc_status_type
 168 do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
 169                 error_message, get_data, put_data)
 170      bfd *abfd;
 171      arelent *reloc_entry;
 172      struct symbol_cache_entry *symbol;
 173      PTR data;
 174      asection *input_section;
 175      bfd *output_bfd;
 176      char **error_message ATTRIBUTE_UNUSED;
 177      long (*get_data) ();
 178      int (*put_data) ();
 179 {
 180   int overflow = 0;
 181   bfd_vma relocation;
 182   bfd_reloc_status_type flag = bfd_reloc_ok;
 183   bfd_size_type addr = reloc_entry->address;
 184   bfd_vma output_base = 0;
 185   reloc_howto_type *howto = reloc_entry->howto;
 186   asection *reloc_target_output_section;
 187
 188   if ((symbol->section == &bfd_abs_section)
 189       && output_bfd != (bfd *) NULL)
 190     {
 191       reloc_entry->address += input_section->output_offset;
 192       return bfd_reloc_ok;
 193     }
 194
 195   /* If we are not producing relocateable output, return an error if
 196      the symbol is not defined.  An undefined weak symbol is
 197      considered to have a value of zero (SVR4 ABI, p. 4-27).  */
 198   if (symbol->section == &bfd_und_section
 199       && (symbol->flags & BSF_WEAK) == 0
 200       && output_bfd == (bfd *) NULL)
 201     flag = bfd_reloc_undefined;
 202
 203   /* Is the address of the relocation really within the section?  */
 204   if (reloc_entry->address > input_section->_cooked_size)
 205     return bfd_reloc_outofrange;
 206
 207   /* Work out which section the relocation is targetted at and the
 208      initial relocation command value.  */
 209
 210   /* Get symbol value.  (Common symbols are special.)  */
 211   if (bfd_is_com_section (symbol->section))
 212     relocation = 0;
 213   else
 214     relocation = symbol->value;
 215
 216   reloc_target_output_section = symbol->section->output_section;
 217
 218   /* Convert input-section-relative symbol value to absolute.  */
 219   if (output_bfd && howto->partial_inplace == false)
 220     output_base = 0;
 221   else
 222     output_base = reloc_target_output_section->vma;
 223
 224   relocation += output_base + symbol->section->output_offset;
 225
 226   /* Add in supplied addend.  */
 227   relocation += reloc_entry->addend;
 228
 229   /* Here the variable relocation holds the final address of the
 230      symbol we are relocating against, plus any addend.  */
 231
 232   if (howto->pc_relative == true)
 233     {
 234       /* This is a PC relative relocation.  We want to set RELOCATION
 235          to the distance between the address of the symbol and the
 236          location.  RELOCATION is already the address of the symbol.
 237
 238          We start by subtracting the address of the section containing
 239          the location.
 240
 241          If pcrel_offset is set, we must further subtract the position
 242          of the location within the section.  Some targets arrange for
 243          the addend to be the negative of the position of the location
 244          within the section; for example, i386-aout does this.  For
 245          i386-aout, pcrel_offset is false.  Some other targets do not
 246          include the position of the location; for example, m88kbcs,
 247          or ELF.  For those targets, pcrel_offset is true.
 248
 249          If we are producing relocateable output, then we must ensure
 250          that this reloc will be correctly computed when the final
 251          relocation is done.  If pcrel_offset is false we want to wind
 252          up with the negative of the location within the section,
 253          which means we must adjust the existing addend by the change
 254          in the location within the section.  If pcrel_offset is true
 255          we do not want to adjust the existing addend at all.
 256
 257          FIXME: This seems logical to me, but for the case of
 258          producing relocateable output it is not what the code
 259          actually does.  I don't want to change it, because it seems
 260          far too likely that something will break.  */
 261
 262       relocation -=
 263         input_section->output_section->vma + input_section->output_offset;
 264
 265       if (howto->pcrel_offset == true)
 266         relocation -= reloc_entry->address;
 267     }
 268
 269   if (output_bfd != (bfd *) NULL)
 270     {
 271       if (howto->partial_inplace == false)
 272         {
 273           /* This is a partial relocation, and we want to apply the relocation
 274              to the reloc entry rather than the raw data. Modify the reloc
 275              inplace to reflect what we now know.  */
 276           reloc_entry->addend = relocation;
 277           reloc_entry->address += input_section->output_offset;
 278           return flag;
 279         }
 280       else
 281         {
 282           /* This is a partial relocation, but inplace, so modify the
 283              reloc record a bit.
 284
 285              If we've relocated with a symbol with a section, change
 286              into a ref to the section belonging to the symbol.  */
 287
 288           reloc_entry->address += input_section->output_offset;
 289
 290           /* WTF?? */
 291           if (abfd->xvec->flavour == bfd_target_coff_flavour)
 292             {
 293 #if 1
 294               /* For m68k-coff, the addend was being subtracted twice during
 295                  relocation with -r.  Removing the line below this comment
 296                  fixes that problem; see PR 2953.
 297
 298 However, Ian wrote the following, regarding removing the line below,
 299 which explains why it is still enabled:  --djm
 300
 301 If you put a patch like that into BFD you need to check all the COFF
 302 linkers.  I am fairly certain that patch will break coff-i386 (e.g.,
 303 SCO); see coff_i386_reloc in coff-i386.c where I worked around the
 304 problem in a different way.  There may very well be a reason that the
 305 code works as it does.
 306
 307 Hmmm.  The first obvious point is that bfd_perform_relocation should
 308 not have any tests that depend upon the flavour.  It's seem like
 309 entirely the wrong place for such a thing.  The second obvious point
 310 is that the current code ignores the reloc addend when producing
 311 relocateable output for COFF.  That's peculiar.  In fact, I really
 312 have no idea what the point of the line you want to remove is.
 313
 314 A typical COFF reloc subtracts the old value of the symbol and adds in
 315 the new value to the location in the object file (if it's a pc
 316 relative reloc it adds the difference between the symbol value and the
 317 location).  When relocating we need to preserve that property.
 318
 319 BFD handles this by setting the addend to the negative of the old
 320 value of the symbol.  Unfortunately it handles common symbols in a
 321 non-standard way (it doesn't subtract the old value) but that's a
 322 different story (we can't change it without losing backward
 323 compatibility with old object files) (coff-i386 does subtract the old
 324 value, to be compatible with existing coff-i386 targets, like SCO).
 325
 326 So everything works fine when not producing relocateable output.  When
 327 we are producing relocateable output, logically we should do exactly
 328 what we do when not producing relocateable output.  Therefore, your
 329 patch is correct.  In fact, it should probably always just set
 330 reloc_entry->addend to 0 for all cases, since it is, in fact, going to
 331 add the value into the object file.  This won't hurt the COFF code,
 332 which doesn't use the addend; I'm not sure what it will do to other
 333 formats (the thing to check for would be whether any formats both use
 334 the addend and set partial_inplace).
 335
 336 When I wanted to make coff-i386 produce relocateable output, I ran
 337 into the problem that you are running into: I wanted to remove that
 338 line.  Rather than risk it, I made the coff-i386 relocs use a special
 339 function; it's coff_i386_reloc in coff-i386.c.  The function
 340 specifically adds the addend field into the object file, knowing that
 341 bfd_perform_relocation is not going to.  If you remove that line, then
 342 coff-i386.c will wind up adding the addend field in twice.  It's
 343 trivial to fix; it just needs to be done.
 344
 345 The problem with removing the line is just that it may break some
 346 working code.  With BFD it's hard to be sure of anything.  The right
 347 way to deal with this is simply to build and test at least all the
 348 supported COFF targets.  It should be straightforward if time and disk
 349 space consuming.  For each target:
 350     1) build the linker
 351     2) generate some executable, and link it using -r (I would
 352        probably use paranoia.o and link against newlib/libc.a, which
 353        for all the supported targets would be available in
 354        /usr/cygnus/progressive/H-host/target/lib/libc.a).
 355     3) make the change to reloc.c
 356     4) rebuild the linker
 357     5) repeat step 2
 358     6) if the resulting object files are the same, you have at least
 359        made it no worse
 360     7) if they are different you have to figure out which version is
 361        right
 362 */
 363               relocation -= reloc_entry->addend;
 364 #endif
 365               reloc_entry->addend = 0;
 366             }
 367           else
 368             {
 369               reloc_entry->addend = relocation;
 370             }
 371         }
 372     }
 373   else
 374     {
 375       reloc_entry->addend = 0;
 376     }
 377
 378   /* FIXME: This overflow checking is incomplete, because the value
 379      might have overflowed before we get here.  For a correct check we
 380      need to compute the value in a size larger than bitsize, but we
 381      can't reasonably do that for a reloc the same size as a host
 382      machine word.
 383      FIXME: We should also do overflow checking on the result after
 384      adding in the value contained in the object file.  */
 385   if (howto->complain_on_overflow != complain_overflow_dont)
 386     {
 387       bfd_vma check;
 388
 389       /* Get the value that will be used for the relocation, but
 390          starting at bit position zero.  */
 391       if (howto->rightshift > howto->bitpos)
 392         check = relocation >> (howto->rightshift - howto->bitpos);
 393       else
 394         check = relocation << (howto->bitpos - howto->rightshift);
 395       switch (howto->complain_on_overflow)
 396         {
 397         case complain_overflow_signed:
 398           {
 399             /* Assumes two's complement.  */
 400             bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
 401             bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
 402
 403             /* The above right shift is incorrect for a signed value.
 404                Fix it up by forcing on the upper bits.  */
 405             if (howto->rightshift > howto->bitpos
 406                 && (bfd_signed_vma) relocation < 0)
 407               check |= ((bfd_vma) - 1
 408                         & ~((bfd_vma) - 1
 409                             >> (howto->rightshift - howto->bitpos)));
 410             if ((bfd_signed_vma) check > reloc_signed_max
 411                 || (bfd_signed_vma) check < reloc_signed_min)
 412               flag = bfd_reloc_overflow;
 413           }
 414           break;
 415         case complain_overflow_unsigned:
 416           {
 417             /* Assumes two's complement.  This expression avoids
 418                overflow if howto->bitsize is the number of bits in
 419                bfd_vma.  */
 420             bfd_vma reloc_unsigned_max =
 421             (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 422
 423             if ((bfd_vma) check > reloc_unsigned_max)
 424               flag = bfd_reloc_overflow;
 425           }
 426           break;
 427         case complain_overflow_bitfield:
 428           {
 429             /* Assumes two's complement.  This expression avoids
 430                overflow if howto->bitsize is the number of bits in
 431                bfd_vma.  */
 432             bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 433
 434             if (((bfd_vma) check & ~reloc_bits) != 0
 435                 && ((bfd_vma) check & ~reloc_bits) != (-1 & ~reloc_bits))
 436               {
 437                 /* The above right shift is incorrect for a signed
 438                    value.  See if turning on the upper bits fixes the
 439                    overflow.  */
 440                 if (howto->rightshift > howto->bitpos
 441                     && (bfd_signed_vma) relocation < 0)
 442                   {
 443                     check |= ((bfd_vma) - 1
 444                               & ~((bfd_vma) - 1
 445                                   >> (howto->rightshift - howto->bitpos)));
 446                     if (((bfd_vma) check & ~reloc_bits) != (-1 & ~reloc_bits))
 447                       flag = bfd_reloc_overflow;
 448                   }
 449                 else
 450                   flag = bfd_reloc_overflow;
 451               }
 452           }
 453           break;
 454         default:
 455           abort ();
 456         }
 457     }
 458
 459   /*
 460     Either we are relocating all the way, or we don't want to apply
 461     the relocation to the reloc entry (probably because there isn't
 462     any room in the output format to describe addends to relocs)
 463     */
 464
 465   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
 466      (OSF version 1.3, compiler version 3.11).  It miscompiles the
 467      following program:
 468
 469      struct str
 470      {
 471        unsigned int i0;
 472      } s = { 0 };
 473
 474      int
 475      main ()
 476      {
 477        unsigned long x;
 478
 479        x = 0x100000000;
 480        x <<= (unsigned long) s.i0;
 481        if (x == 0)
 482          printf ("failed\n");
 483        else
 484          printf ("succeeded (%lx)\n", x);
 485      }
 486      */
 487
 488   relocation >>= (bfd_vma) howto->rightshift;
 489
 490   /* Shift everything up to where it's going to be used */
 491
 492   relocation <<= (bfd_vma) howto->bitpos;
 493
 494   /* Wait for the day when all have the mask in them */
 495
 496   /* What we do:
 497      i instruction to be left alone
 498      o offset within instruction
 499      r relocation offset to apply
 500      S src mask
 501      D dst mask
 502      N ~dst mask
 503      A part 1
 504      B part 2
 505      R result
 506
 507      Do this:
 508      i i i i i o o o o o        from bfd_get<size>
 509      and           S S S S S    to get the size offset we want
 510      +   r r r r r r r r r r  to get the final value to place
 511      and           D D D D D  to chop to right size
 512      -----------------------
 513      A A A A A
 514      And this:
 515      ...   i i i i i o o o o o  from bfd_get<size>
 516      and   N N N N N            get instruction
 517      -----------------------
 518      ...   B B B B B
 519
 520      And then:
 521      B B B B B
 522      or              A A A A A
 523      -----------------------
 524      R R R R R R R R R R        put into bfd_put<size>
 525      */
 526
 527 #define DOIT(x) \
 528   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 529
 530   switch (howto->size)
 531     {
 532     case 0:
 533       {
 534         char x = get_data (data, addr, 1);
 535         DOIT (x);
 536         overflow = put_data(x, data, addr, 1);
 537       }
 538       break;
 539
 540     case 1:
 541       if (relocation)
 542         {
 543           short x = get_data (data, addr, 2);
 544           DOIT (x);
 545           overflow = put_data(x, (unsigned char *) data, addr, 2);
 546         }
 547       break;
 548     case 2:
 549       if (relocation)
 550         {
 551           long x = get_data (data, addr, 4);
 552           DOIT (x);
 553           overflow = put_data(x, data, addr, 4);
 554         }
 555       break;
 556     case -2:
 557       {
 558         long  x = get_data(data, addr, 4);
 559         relocation = -relocation;
 560         DOIT(x);
 561         overflow = put_data(x, data , addr, 4);
 562       }
 563       break;
 564
 565     case 3:
 566       /* Do nothing */
 567       break;
 568
 569     case 4:
 570 #ifdef BFD64
 571       if (relocation)
 572         {
 573           bfd_vma x = get_data (data, addr, 8);
 574           DOIT (x);
 575           overflow = put_data(x, data, addr, 8);
 576         }
 577 #else
 578       abort ();
 579 #endif
 580       break;
 581     default:
 582       return bfd_reloc_other;
 583     }
 584   if ((howto->complain_on_overflow != complain_overflow_dont) && overflow)
 585     return bfd_reloc_overflow;
 586
 587   return flag;
 588 }
 589
 590 /* Relocate a given location using a given value and howto.  */
 591
 592 bfd_reloc_status_type
 593 _bfd_do_ns32k_reloc_contents ( howto, input_bfd, relocation, location,
 594                               get_data, put_data)
 595      reloc_howto_type *howto;
 596      bfd *input_bfd ATTRIBUTE_UNUSED;
 597      bfd_vma relocation;
 598      bfd_byte *location;
 599      long (*get_data) ();
 600      int (*put_data) ();
 601 {
 602   int size;
 603   bfd_vma x;
 604   boolean overflow;
 605
 606   /* If the size is negative, negate RELOCATION.  This isn't very
 607      general.  */
 608   if (howto->size < 0)
 609     relocation = -relocation;
 610
 611   /* Get the value we are going to relocate.  */
 612   size = bfd_get_reloc_size (howto);
 613   switch (size)
 614     {
 615     default:
 616     case 0:
 617       abort ();
 618     case 1:
 619     case 2:
 620     case 4:
 621 #ifdef BFD64
 622     case 8:
 623 #endif
 624       x = get_data (location, 0, size);
 625       break;
 626     }
 627
 628   /* Check for overflow.  FIXME: We may drop bits during the addition
 629      which we don't check for.  We must either check at every single
 630      operation, which would be tedious, or we must do the computations
 631      in a type larger than bfd_vma, which would be inefficient.  */
 632   overflow = false;
 633   if (howto->complain_on_overflow != complain_overflow_dont)
 634     {
 635       bfd_vma check;
 636       bfd_signed_vma signed_check;
 637       bfd_vma add;
 638       bfd_signed_vma signed_add;
 639
 640       if (howto->rightshift == 0)
 641         {
 642           check = relocation;
 643           signed_check = (bfd_signed_vma) relocation;
 644         }
 645       else
 646         {
 647           /* Drop unwanted bits from the value we are relocating to.  */
 648           check = relocation >> howto->rightshift;
 649
 650           /* If this is a signed value, the rightshift just dropped
 651              leading 1 bits (assuming twos complement).  */
 652           if ((bfd_signed_vma) relocation >= 0)
 653             signed_check = check;
 654           else
 655             signed_check = (check
 656                             | ((bfd_vma) - 1
 657                                & ~((bfd_vma) - 1 >> howto->rightshift)));
 658         }
 659
 660       /* Get the value from the object file.  */
 661       add = x & howto->src_mask;
 662
 663       /* Get the value from the object file with an appropriate sign.
 664          The expression involving howto->src_mask isolates the upper
 665          bit of src_mask.  If that bit is set in the value we are
 666          adding, it is negative, and we subtract out that number times
 667          two.  If src_mask includes the highest possible bit, then we
 668          can not get the upper bit, but that does not matter since
 669          signed_add needs no adjustment to become negative in that
 670          case.  */
 671       signed_add = add;
 672       if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0)
 673         signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1;
 674
 675       /* Add the value from the object file, shifted so that it is a
 676          straight number.  */
 677       if (howto->bitpos == 0)
 678         {
 679           check += add;
 680           signed_check += signed_add;
 681         }
 682       else
 683         {
 684           check += add >> howto->bitpos;
 685
 686           /* For the signed case we use ADD, rather than SIGNED_ADD,
 687              to avoid warnings from SVR4 cc.  This is OK since we
 688              explictly handle the sign bits.  */
 689           if (signed_add >= 0)
 690             signed_check += add >> howto->bitpos;
 691           else
 692             signed_check += ((add >> howto->bitpos)
 693                              | ((bfd_vma) - 1
 694                                 & ~((bfd_vma) - 1 >> howto->bitpos)));
 695         }
 696
 697       switch (howto->complain_on_overflow)
 698         {
 699         case complain_overflow_signed:
 700           {
 701             /* Assumes two's complement.  */
 702             bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
 703             bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
 704
 705             if (signed_check > reloc_signed_max
 706                 || signed_check < reloc_signed_min)
 707               overflow = true;
 708           }
 709           break;
 710         case complain_overflow_unsigned:
 711           {
 712             /* Assumes two's complement.  This expression avoids
 713                overflow if howto->bitsize is the number of bits in
 714                bfd_vma.  */
 715             bfd_vma reloc_unsigned_max =
 716             (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 717
 718             if (check > reloc_unsigned_max)
 719               overflow = true;
 720           }
 721           break;
 722         case complain_overflow_bitfield:
 723           {
 724             /* Assumes two's complement.  This expression avoids
 725                overflow if howto->bitsize is the number of bits in
 726                bfd_vma.  */
 727             bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 728
 729             if ((check & ~reloc_bits) != 0
 730                 && (((bfd_vma) signed_check & ~reloc_bits)
 731                     != (-1 & ~reloc_bits)))
 732               overflow = true;
 733           }
 734           break;
 735         default:
 736           abort ();
 737         }
 738     }
 739
 740   /* Put RELOCATION in the right bits.  */
 741   relocation >>= (bfd_vma) howto->rightshift;
 742   relocation <<= (bfd_vma) howto->bitpos;
 743
 744   /* Add RELOCATION to the right bits of X.  */
 745   x = ((x & ~howto->dst_mask)
 746        | (((x & howto->src_mask) + relocation) & howto->dst_mask));
 747
 748   /* Put the relocated value back in the object file.  */
 749   switch (size)
 750     {
 751     default:
 752     case 0:
 753       abort ();
 754     case 1:
 755     case 2:
 756     case 4:
 757 #ifdef BFD64
 758     case 8:
 759 #endif
 760       put_data(x, location, 0, size);
 761       break;
 762     }
 763
 764   return overflow ? bfd_reloc_overflow : bfd_reloc_ok;
 765 }
 766
 767 bfd_reloc_status_type
 768 _bfd_ns32k_reloc_disp (abfd, reloc_entry, symbol, data, input_section,
 769                        output_bfd, error_message)
 770      bfd *abfd;
 771      arelent *reloc_entry;
 772      struct symbol_cache_entry *symbol;
 773      PTR data;
 774      asection *input_section;
 775      bfd *output_bfd;
 776      char **error_message;
 777 {
 778   return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
 779                          output_bfd, error_message,
 780                          _bfd_ns32k_get_displacement,
 781                          _bfd_ns32k_put_displacement);
 782 }
 783
 784 bfd_reloc_status_type
 785 _bfd_ns32k_reloc_imm (abfd, reloc_entry, symbol, data, input_section,
 786                       output_bfd, error_message)
 787      bfd *abfd;
 788      arelent *reloc_entry;
 789      struct symbol_cache_entry *symbol;
 790      PTR data;
 791      asection *input_section;
 792      bfd *output_bfd;
 793      char **error_message;
 794 {
 795   return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
 796                          output_bfd, error_message, _bfd_ns32k_get_immediate,
 797                          _bfd_ns32k_put_immediate);
 798 }
 799
 800 bfd_reloc_status_type
 801 _bfd_ns32k_final_link_relocate (howto, input_bfd, input_section, contents,
 802                                 address, value, addend)
 803      reloc_howto_type *howto;
 804      bfd *input_bfd;
 805      asection *input_section;
 806      bfd_byte *contents;
 807      bfd_vma address;
 808      bfd_vma value;
 809      bfd_vma addend;
 810 {
 811   bfd_vma relocation;
 812
 813   /* Sanity check the address.  */
 814   if (address > input_section->_cooked_size)
 815     return bfd_reloc_outofrange;
 816
 817   /* This function assumes that we are dealing with a basic relocation
 818      against a symbol.  We want to compute the value of the symbol to
 819      relocate to.  This is just VALUE, the value of the symbol, plus
 820      ADDEND, any addend associated with the reloc.  */
 821   relocation = value + addend;
 822
 823   /* If the relocation is PC relative, we want to set RELOCATION to
 824      the distance between the symbol (currently in RELOCATION) and the
 825      location we are relocating.  Some targets (e.g., i386-aout)
 826      arrange for the contents of the section to be the negative of the
 827      offset of the location within the section; for such targets
 828      pcrel_offset is false.  Other targets (e.g., m88kbcs or ELF)
 829      simply leave the contents of the section as zero; for such
 830      targets pcrel_offset is true.  If pcrel_offset is false we do not
 831      need to subtract out the offset of the location within the
 832      section (which is just ADDRESS).  */
 833   if (howto->pc_relative)
 834     {
 835       relocation -= (input_section->output_section->vma
 836                      + input_section->output_offset);
 837       if (howto->pcrel_offset)
 838         relocation -= address;
 839     }
 840
 841   return _bfd_ns32k_relocate_contents (howto, input_bfd, relocation,
 842                                        contents + address);
 843 }