bfd/cpu-ns32k.c

   1 /* BFD support for the ns32k architecture.
   2    Copyright (C) 1990-2015 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 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 "libbfd.h"
  26 #include "ns32k.h"
  27
  28 #define N(machine, printable, d, next)  \
  29 {  32, 32, 8, bfd_arch_ns32k, machine, "ns32k",printable,3,d, \
  30    bfd_default_compatible,bfd_default_scan,bfd_arch_default_fill,next, }
  31
  32 static const bfd_arch_info_type arch_info_struct[] =
  33 {
  34   N(32532,"ns32k:32532",TRUE, 0), /* The word ns32k will match this too.  */
  35 };
  36
  37 const bfd_arch_info_type bfd_ns32k_arch =
  38   N(32032,"ns32k:32032",FALSE, &arch_info_struct[0]);
  39
  40 bfd_vma
  41 _bfd_ns32k_get_displacement (bfd_byte *buffer, int size)
  42 {
  43   bfd_signed_vma value;
  44
  45   switch (size)
  46     {
  47     case 1:
  48       value = ((*buffer & 0x7f) ^ 0x40) - 0x40;
  49       break;
  50
  51     case 2:
  52       value = ((*buffer++ & 0x3f) ^ 0x20) - 0x20;
  53       value = (value << 8) | (0xff & *buffer);
  54       break;
  55
  56     case 4:
  57       value = ((*buffer++ & 0x3f) ^ 0x20) - 0x20;
  58       value = (value << 8) | (0xff & *buffer++);
  59       value = (value << 8) | (0xff & *buffer++);
  60       value = (value << 8) | (0xff & *buffer);
  61       break;
  62
  63     default:
  64       abort ();
  65       return 0;
  66     }
  67
  68   return value;
  69 }
  70
  71 void
  72 _bfd_ns32k_put_displacement (bfd_vma value, bfd_byte *buffer, int size)
  73 {
  74   switch (size)
  75     {
  76     case 1:
  77       value &= 0x7f;
  78       *buffer++ = value;
  79       break;
  80
  81     case 2:
  82       value &= 0x3fff;
  83       value |= 0x8000;
  84       *buffer++ = (value >> 8);
  85       *buffer++ = value;
  86       break;
  87
  88     case 4:
  89       value |= (bfd_vma) 0xc0000000;
  90       *buffer++ = (value >> 24);
  91       *buffer++ = (value >> 16);
  92       *buffer++ = (value >> 8);
  93       *buffer++ = value;
  94       break;
  95   }
  96   return;
  97 }
  98
  99 bfd_vma
 100 _bfd_ns32k_get_immediate (bfd_byte *buffer, int size)
 101 {
 102   bfd_vma value = 0;
 103
 104   switch (size)
 105     {
 106     case 4:
 107       value = (value << 8) | (*buffer++ & 0xff);
 108       value = (value << 8) | (*buffer++ & 0xff);
 109     case 2:
 110       value = (value << 8) | (*buffer++ & 0xff);
 111     case 1:
 112       value = (value << 8) | (*buffer++ & 0xff);
 113       break;
 114     default:
 115       abort ();
 116     }
 117   return value;
 118 }
 119
 120 void
 121 _bfd_ns32k_put_immediate (bfd_vma value, bfd_byte *buffer, int size)
 122 {
 123   buffer += size - 1;
 124   switch (size)
 125     {
 126     case 4:
 127       *buffer-- = (value & 0xff); value >>= 8;
 128       *buffer-- = (value & 0xff); value >>= 8;
 129     case 2:
 130       *buffer-- = (value & 0xff); value >>= 8;
 131     case 1:
 132       *buffer-- = (value & 0xff); value >>= 8;
 133     }
 134 }
 135
 136 /* This is just like the standard perform_relocation except we
 137    use get_data and put_data which know about the ns32k storage
 138    methods.  This is probably a lot more complicated than it
 139    needs to be!  */
 140
 141 static bfd_reloc_status_type
 142 do_ns32k_reloc (bfd *      abfd,
 143                 arelent *  reloc_entry,
 144                 struct bfd_symbol * symbol,
 145                 void *     data,
 146                 asection * input_section,
 147                 bfd *      output_bfd,
 148                 char **    error_message ATTRIBUTE_UNUSED,
 149                 bfd_vma (* get_data) (bfd_byte *, int),
 150                 void (*    put_data) (bfd_vma, bfd_byte *, int))
 151 {
 152   int overflow = 0;
 153   bfd_vma relocation;
 154   bfd_reloc_status_type flag = bfd_reloc_ok;
 155   bfd_size_type addr = reloc_entry->address;
 156   bfd_vma output_base = 0;
 157   reloc_howto_type *howto = reloc_entry->howto;
 158   asection *reloc_target_output_section;
 159   bfd_byte *location;
 160
 161   if (bfd_is_abs_section (symbol->section)
 162       && output_bfd != (bfd *) NULL)
 163     {
 164       reloc_entry->address += input_section->output_offset;
 165       return bfd_reloc_ok;
 166     }
 167
 168   /* If we are not producing relocatable output, return an error if
 169      the symbol is not defined.  An undefined weak symbol is
 170      considered to have a value of zero (SVR4 ABI, p. 4-27).  */
 171   if (bfd_is_und_section (symbol->section)
 172       && (symbol->flags & BSF_WEAK) == 0
 173       && output_bfd == (bfd *) NULL)
 174     flag = bfd_reloc_undefined;
 175
 176   /* Is the address of the relocation really within the section?  */
 177   if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
 178     return bfd_reloc_outofrange;
 179
 180   /* Work out which section the relocation is targeted at and the
 181      initial relocation command value.  */
 182
 183   /* Get symbol value.  (Common symbols are special.)  */
 184   if (bfd_is_com_section (symbol->section))
 185     relocation = 0;
 186   else
 187     relocation = symbol->value;
 188
 189   reloc_target_output_section = symbol->section->output_section;
 190
 191   /* Convert input-section-relative symbol value to absolute.  */
 192   if (output_bfd != NULL && ! howto->partial_inplace)
 193     output_base = 0;
 194   else
 195     output_base = reloc_target_output_section->vma;
 196
 197   relocation += output_base + symbol->section->output_offset;
 198
 199   /* Add in supplied addend.  */
 200   relocation += reloc_entry->addend;
 201
 202   /* Here the variable relocation holds the final address of the
 203      symbol we are relocating against, plus any addend.  */
 204
 205   if (howto->pc_relative)
 206     {
 207       /* This is a PC relative relocation.  We want to set RELOCATION
 208          to the distance between the address of the symbol and the
 209          location.  RELOCATION is already the address of the symbol.
 210
 211          We start by subtracting the address of the section containing
 212          the location.
 213
 214          If pcrel_offset is set, we must further subtract the position
 215          of the location within the section.  Some targets arrange for
 216          the addend to be the negative of the position of the location
 217          within the section; for example, i386-aout does this.  For
 218          i386-aout, pcrel_offset is FALSE.  Some other targets do not
 219          include the position of the location; for example, m88kbcs,
 220          or ELF.  For those targets, pcrel_offset is TRUE.
 221
 222          If we are producing relocatable output, then we must ensure
 223          that this reloc will be correctly computed when the final
 224          relocation is done.  If pcrel_offset is FALSE we want to wind
 225          up with the negative of the location within the section,
 226          which means we must adjust the existing addend by the change
 227          in the location within the section.  If pcrel_offset is TRUE
 228          we do not want to adjust the existing addend at all.
 229
 230          FIXME: This seems logical to me, but for the case of
 231          producing relocatable output it is not what the code
 232          actually does.  I don't want to change it, because it seems
 233          far too likely that something will break.  */
 234       relocation -=
 235         input_section->output_section->vma + input_section->output_offset;
 236
 237       if (howto->pcrel_offset)
 238         relocation -= reloc_entry->address;
 239     }
 240
 241   if (output_bfd != (bfd *) NULL)
 242     {
 243       if (! howto->partial_inplace)
 244         {
 245           /* This is a partial relocation, and we want to apply the relocation
 246              to the reloc entry rather than the raw data. Modify the reloc
 247              inplace to reflect what we now know.  */
 248           reloc_entry->addend = relocation;
 249           reloc_entry->address += input_section->output_offset;
 250           return flag;
 251         }
 252       else
 253         {
 254           /* This is a partial relocation, but inplace, so modify the
 255              reloc record a bit.
 256
 257              If we've relocated with a symbol with a section, change
 258              into a ref to the section belonging to the symbol.  */
 259
 260           reloc_entry->address += input_section->output_offset;
 261
 262           /* WTF?? */
 263           if (abfd->xvec->flavour == bfd_target_coff_flavour)
 264             {
 265               /* For m68k-coff, the addend was being subtracted twice during
 266                  relocation with -r.  Removing the line below this comment
 267                  fixes that problem; see PR 2953.
 268
 269                  However, Ian wrote the following, regarding removing the line
 270                  below, which explains why it is still enabled:  --djm
 271
 272                  If you put a patch like that into BFD you need to check all
 273                  the COFF linkers.  I am fairly certain that patch will break
 274                  coff-i386 (e.g., SCO); see coff_i386_reloc in coff-i386.c
 275                  where I worked around the problem in a different way.  There
 276                  may very well be a reason that the code works as it does.
 277
 278                  Hmmm.  The first obvious point is that bfd_perform_relocation
 279                  should not have any tests that depend upon the flavour.  It's
 280                  seem like entirely the wrong place for such a thing.  The
 281                  second obvious point is that the current code ignores the
 282                  reloc addend when producing relocatable output for COFF.
 283                  That's peculiar.  In fact, I really have no idea what the
 284                  point of the line you want to remove is.
 285
 286                  A typical COFF reloc subtracts the old value of the symbol
 287                  and adds in the new value to the location in the object file
 288                  (if it's a pc relative reloc it adds the difference between
 289                  the symbol value and the location).  When relocating we need
 290                  to preserve that property.
 291
 292                  BFD handles this by setting the addend to the negative of the
 293                  old value of the symbol.  Unfortunately it handles common
 294                  symbols in a non-standard way (it doesn't subtract the old
 295                  value) but that's a different story (we can't change it
 296                  without losing backward compatibility with old object files)
 297                  (coff-i386 does subtract the old value, to be compatible with
 298                  existing coff-i386 targets, like SCO).
 299
 300                  So everything works fine when not producing relocatable
 301                  output.  When we are producing relocatable output, logically
 302                  we should do exactly what we do when not producing
 303                  relocatable output.  Therefore, your patch is correct.  In
 304                  fact, it should probably always just set reloc_entry->addend
 305                  to 0 for all cases, since it is, in fact, going to add the
 306                  value into the object file.  This won't hurt the COFF code,
 307                  which doesn't use the addend; I'm not sure what it will do
 308                  to other formats (the thing to check for would be whether
 309                  any formats both use the addend and set partial_inplace).
 310
 311                  When I wanted to make coff-i386 produce relocatable output,
 312                  I ran into the problem that you are running into: I wanted
 313                  to remove that line.  Rather than risk it, I made the
 314                  coff-i386 relocs use a special function; it's coff_i386_reloc
 315                  in coff-i386.c.  The function specifically adds the addend
 316                  field into the object file, knowing that bfd_perform_relocation
 317                  is not going to.  If you remove that line, then coff-i386.c
 318                  will wind up adding the addend field in twice.  It's trivial
 319                  to fix; it just needs to be done.
 320
 321                  The problem with removing the line is just that it may break
 322                  some working code.  With BFD it's hard to be sure of anything.
 323                  The right way to deal with this is simply to build and test at
 324                  least all the supported COFF targets.  It should be
 325                  straightforward if time and disk space consuming.  For each
 326                  target:
 327                    1) build the linker
 328                    2) generate some executable, and link it using -r (I would
 329                       probably use paranoia.o and link against newlib/libc.a,
 330                       which for all the supported targets would be available in
 331                       /usr/cygnus/progressive/H-host/target/lib/libc.a).
 332                    3) make the change to reloc.c
 333                    4) rebuild the linker
 334                    5) repeat step 2
 335                    6) if the resulting object files are the same, you have at
 336                       least made it no worse
 337                    7) if they are different you have to figure out which
 338                       version is right.  */
 339               relocation -= reloc_entry->addend;
 340               reloc_entry->addend = 0;
 341             }
 342           else
 343             {
 344               reloc_entry->addend = relocation;
 345             }
 346         }
 347     }
 348   else
 349     {
 350       reloc_entry->addend = 0;
 351     }
 352
 353   /* FIXME: This overflow checking is incomplete, because the value
 354      might have overflowed before we get here.  For a correct check we
 355      need to compute the value in a size larger than bitsize, but we
 356      can't reasonably do that for a reloc the same size as a host
 357      machine word.
 358      FIXME: We should also do overflow checking on the result after
 359      adding in the value contained in the object file.  */
 360   if (howto->complain_on_overflow != complain_overflow_dont)
 361     {
 362       bfd_vma check;
 363
 364       /* Get the value that will be used for the relocation, but
 365          starting at bit position zero.  */
 366       if (howto->rightshift > howto->bitpos)
 367         check = relocation >> (howto->rightshift - howto->bitpos);
 368       else
 369         check = relocation << (howto->bitpos - howto->rightshift);
 370       switch (howto->complain_on_overflow)
 371         {
 372         case complain_overflow_signed:
 373           {
 374             /* Assumes two's complement.  */
 375             bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
 376             bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
 377
 378             /* The above right shift is incorrect for a signed value.
 379                Fix it up by forcing on the upper bits.  */
 380             if (howto->rightshift > howto->bitpos
 381                 && (bfd_signed_vma) relocation < 0)
 382               check |= ((bfd_vma) - 1
 383                         & ~((bfd_vma) - 1
 384                             >> (howto->rightshift - howto->bitpos)));
 385             if ((bfd_signed_vma) check > reloc_signed_max
 386                 || (bfd_signed_vma) check < reloc_signed_min)
 387               flag = bfd_reloc_overflow;
 388           }
 389           break;
 390         case complain_overflow_unsigned:
 391           {
 392             /* Assumes two's complement.  This expression avoids
 393                overflow if howto->bitsize is the number of bits in
 394                bfd_vma.  */
 395             bfd_vma reloc_unsigned_max =
 396             (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 397
 398             if ((bfd_vma) check > reloc_unsigned_max)
 399               flag = bfd_reloc_overflow;
 400           }
 401           break;
 402         case complain_overflow_bitfield:
 403           {
 404             /* Assumes two's complement.  This expression avoids
 405                overflow if howto->bitsize is the number of bits in
 406                bfd_vma.  */
 407             bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 408
 409             if (((bfd_vma) check & ~reloc_bits) != 0
 410                 && (((bfd_vma) check & ~reloc_bits)
 411                     != (-(bfd_vma) 1 & ~reloc_bits)))
 412               {
 413                 /* The above right shift is incorrect for a signed
 414                    value.  See if turning on the upper bits fixes the
 415                    overflow.  */
 416                 if (howto->rightshift > howto->bitpos
 417                     && (bfd_signed_vma) relocation < 0)
 418                   {
 419                     check |= ((bfd_vma) - 1
 420                               & ~((bfd_vma) - 1
 421                                   >> (howto->rightshift - howto->bitpos)));
 422                     if (((bfd_vma) check & ~reloc_bits)
 423                         != (-(bfd_vma) 1 & ~reloc_bits))
 424                       flag = bfd_reloc_overflow;
 425                   }
 426                 else
 427                   flag = bfd_reloc_overflow;
 428               }
 429           }
 430           break;
 431         default:
 432           abort ();
 433         }
 434     }
 435
 436   /* Either we are relocating all the way, or we don't want to apply
 437      the relocation to the reloc entry (probably because there isn't
 438      any room in the output format to describe addends to relocs).  */
 439
 440   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
 441      (OSF version 1.3, compiler version 3.11).  It miscompiles the
 442      following program:
 443
 444      struct str
 445      {
 446        unsigned int i0;
 447      } s = { 0 };
 448
 449      int
 450      main ()
 451      {
 452        unsigned long x;
 453
 454        x = 0x100000000;
 455        x <<= (unsigned long) s.i0;
 456        if (x == 0)
 457          printf ("failed\n");
 458        else
 459          printf ("succeeded (%lx)\n", x);
 460      }
 461      */
 462
 463   relocation >>= (bfd_vma) howto->rightshift;
 464
 465   /* Shift everything up to where it's going to be used.  */
 466   relocation <<= (bfd_vma) howto->bitpos;
 467
 468   /* Wait for the day when all have the mask in them.  */
 469
 470   /* What we do:
 471      i instruction to be left alone
 472      o offset within instruction
 473      r relocation offset to apply
 474      S src mask
 475      D dst mask
 476      N ~dst mask
 477      A part 1
 478      B part 2
 479      R result
 480
 481      Do this:
 482      i i i i i o o o o o        from bfd_get<size>
 483      and           S S S S S    to get the size offset we want
 484      +   r r r r r r r r r r  to get the final value to place
 485      and           D D D D D  to chop to right size
 486      -----------------------
 487      A A A A A
 488      And this:
 489      ...   i i i i i o o o o o  from bfd_get<size>
 490      and   N N N N N            get instruction
 491      -----------------------
 492      ...   B B B B B
 493
 494      And then:
 495      B B B B B
 496      or              A A A A A
 497      -----------------------
 498      R R R R R R R R R R        put into bfd_put<size>.  */
 499
 500 #define DOIT(x) \
 501   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 502
 503   location = (bfd_byte *) data + addr;
 504   switch (howto->size)
 505     {
 506     case 0:
 507       {
 508         bfd_vma x = get_data (location, 1);
 509         DOIT (x);
 510         put_data ((bfd_vma) x, location, 1);
 511       }
 512       break;
 513
 514     case 1:
 515       if (relocation)
 516         {
 517           bfd_vma x = get_data (location, 2);
 518           DOIT (x);
 519           put_data ((bfd_vma) x, location, 2);
 520         }
 521       break;
 522     case 2:
 523       if (relocation)
 524         {
 525           bfd_vma x = get_data (location, 4);
 526           DOIT (x);
 527           put_data ((bfd_vma) x, location, 4);
 528         }
 529       break;
 530     case -2:
 531       {
 532         bfd_vma x = get_data (location, 4);
 533         relocation = -relocation;
 534         DOIT(x);
 535         put_data ((bfd_vma) x, location, 4);
 536       }
 537       break;
 538
 539     case 3:
 540       /* Do nothing.  */
 541       break;
 542
 543     case 4:
 544 #ifdef BFD64
 545       if (relocation)
 546         {
 547           bfd_vma x = get_data (location, 8);
 548           DOIT (x);
 549           put_data (x, location, 8);
 550         }
 551 #else
 552       abort ();
 553 #endif
 554       break;
 555     default:
 556       return bfd_reloc_other;
 557     }
 558   if ((howto->complain_on_overflow != complain_overflow_dont) && overflow)
 559     return bfd_reloc_overflow;
 560
 561   return flag;
 562 }
 563
 564 /* Relocate a given location using a given value and howto.  */
 565
 566 bfd_reloc_status_type
 567 _bfd_do_ns32k_reloc_contents (reloc_howto_type *howto,
 568                               bfd *input_bfd ATTRIBUTE_UNUSED,
 569                               bfd_vma relocation,
 570                               bfd_byte *location,
 571                               bfd_vma (*get_data) (bfd_byte *, int),
 572                               void (*put_data) (bfd_vma, bfd_byte *, int))
 573 {
 574   int size;
 575   bfd_vma x;
 576   bfd_boolean overflow;
 577
 578   /* If the size is negative, negate RELOCATION.  This isn't very
 579      general.  */
 580   if (howto->size < 0)
 581     relocation = -relocation;
 582
 583   /* Get the value we are going to relocate.  */
 584   size = bfd_get_reloc_size (howto);
 585   switch (size)
 586     {
 587     default:
 588     case 0:
 589       abort ();
 590     case 1:
 591     case 2:
 592     case 4:
 593 #ifdef BFD64
 594     case 8:
 595 #endif
 596       x = get_data (location, size);
 597       break;
 598     }
 599
 600   /* Check for overflow.  FIXME: We may drop bits during the addition
 601      which we don't check for.  We must either check at every single
 602      operation, which would be tedious, or we must do the computations
 603      in a type larger than bfd_vma, which would be inefficient.  */
 604   overflow = FALSE;
 605   if (howto->complain_on_overflow != complain_overflow_dont)
 606     {
 607       bfd_vma check;
 608       bfd_signed_vma signed_check;
 609       bfd_vma add;
 610       bfd_signed_vma signed_add;
 611
 612       if (howto->rightshift == 0)
 613         {
 614           check = relocation;
 615           signed_check = (bfd_signed_vma) relocation;
 616         }
 617       else
 618         {
 619           /* Drop unwanted bits from the value we are relocating to.  */
 620           check = relocation >> howto->rightshift;
 621
 622           /* If this is a signed value, the rightshift just dropped
 623              leading 1 bits (assuming twos complement).  */
 624           if ((bfd_signed_vma) relocation >= 0)
 625             signed_check = check;
 626           else
 627             signed_check = (check
 628                             | ((bfd_vma) - 1
 629                                & ~((bfd_vma) - 1 >> howto->rightshift)));
 630         }
 631
 632       /* Get the value from the object file.  */
 633       add = x & howto->src_mask;
 634
 635       /* Get the value from the object file with an appropriate sign.
 636          The expression involving howto->src_mask isolates the upper
 637          bit of src_mask.  If that bit is set in the value we are
 638          adding, it is negative, and we subtract out that number times
 639          two.  If src_mask includes the highest possible bit, then we
 640          can not get the upper bit, but that does not matter since
 641          signed_add needs no adjustment to become negative in that
 642          case.  */
 643       signed_add = add;
 644       if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0)
 645         signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1;
 646
 647       /* Add the value from the object file, shifted so that it is a
 648          straight number.  */
 649       if (howto->bitpos == 0)
 650         {
 651           check += add;
 652           signed_check += signed_add;
 653         }
 654       else
 655         {
 656           check += add >> howto->bitpos;
 657
 658           /* For the signed case we use ADD, rather than SIGNED_ADD,
 659              to avoid warnings from SVR4 cc.  This is OK since we
 660              explicitly handle the sign bits.  */
 661           if (signed_add >= 0)
 662             signed_check += add >> howto->bitpos;
 663           else
 664             signed_check += ((add >> howto->bitpos)
 665                              | ((bfd_vma) - 1
 666                                 & ~((bfd_vma) - 1 >> howto->bitpos)));
 667         }
 668
 669       switch (howto->complain_on_overflow)
 670         {
 671         case complain_overflow_signed:
 672           {
 673             /* Assumes two's complement.  */
 674             bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
 675             bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
 676
 677             if (signed_check > reloc_signed_max
 678                 || signed_check < reloc_signed_min)
 679               overflow = TRUE;
 680           }
 681           break;
 682         case complain_overflow_unsigned:
 683           {
 684             /* Assumes two's complement.  This expression avoids
 685                overflow if howto->bitsize is the number of bits in
 686                bfd_vma.  */
 687             bfd_vma reloc_unsigned_max =
 688             (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 689
 690             if (check > reloc_unsigned_max)
 691               overflow = TRUE;
 692           }
 693           break;
 694         case complain_overflow_bitfield:
 695           {
 696             /* Assumes two's complement.  This expression avoids
 697                overflow if howto->bitsize is the number of bits in
 698                bfd_vma.  */
 699             bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 700
 701             if ((check & ~reloc_bits) != 0
 702                 && (((bfd_vma) signed_check & ~reloc_bits)
 703                     != (-(bfd_vma) 1 & ~reloc_bits)))
 704               overflow = TRUE;
 705           }
 706           break;
 707         default:
 708           abort ();
 709         }
 710     }
 711
 712   /* Put RELOCATION in the right bits.  */
 713   relocation >>= (bfd_vma) howto->rightshift;
 714   relocation <<= (bfd_vma) howto->bitpos;
 715
 716   /* Add RELOCATION to the right bits of X.  */
 717   x = ((x & ~howto->dst_mask)
 718        | (((x & howto->src_mask) + relocation) & howto->dst_mask));
 719
 720   /* Put the relocated value back in the object file.  */
 721   switch (size)
 722     {
 723     default:
 724     case 0:
 725       abort ();
 726     case 1:
 727     case 2:
 728     case 4:
 729 #ifdef BFD64
 730     case 8:
 731 #endif
 732       put_data (x, location, size);
 733       break;
 734     }
 735
 736   return overflow ? bfd_reloc_overflow : bfd_reloc_ok;
 737 }
 738
 739 bfd_reloc_status_type
 740 _bfd_ns32k_reloc_disp (bfd *abfd,
 741                        arelent *reloc_entry,
 742                        struct bfd_symbol *symbol,
 743                        void * data,
 744                        asection *input_section,
 745                        bfd *output_bfd,
 746                        char **error_message)
 747 {
 748   return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
 749                          output_bfd, error_message,
 750                          _bfd_ns32k_get_displacement,
 751                          _bfd_ns32k_put_displacement);
 752 }
 753
 754 bfd_reloc_status_type
 755 _bfd_ns32k_reloc_imm (bfd *abfd,
 756                       arelent *reloc_entry,
 757                       struct bfd_symbol *symbol,
 758                       void * data,
 759                       asection *input_section,
 760                       bfd *output_bfd,
 761                       char **error_message)
 762 {
 763   return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
 764                          output_bfd, error_message, _bfd_ns32k_get_immediate,
 765                          _bfd_ns32k_put_immediate);
 766 }
 767
 768 bfd_reloc_status_type
 769 _bfd_ns32k_final_link_relocate (reloc_howto_type *howto,
 770                                 bfd *input_bfd,
 771                                 asection *input_section,
 772                                 bfd_byte *contents,
 773                                 bfd_vma address,
 774                                 bfd_vma value,
 775                                 bfd_vma addend)
 776 {
 777   bfd_vma relocation;
 778
 779   /* Sanity check the address.  */
 780   if (address > bfd_get_section_limit (input_bfd, input_section))
 781     return bfd_reloc_outofrange;
 782
 783   /* This function assumes that we are dealing with a basic relocation
 784      against a symbol.  We want to compute the value of the symbol to
 785      relocate to.  This is just VALUE, the value of the symbol, plus
 786      ADDEND, any addend associated with the reloc.  */
 787   relocation = value + addend;
 788
 789   /* If the relocation is PC relative, we want to set RELOCATION to
 790      the distance between the symbol (currently in RELOCATION) and the
 791      location we are relocating.  Some targets (e.g., i386-aout)
 792      arrange for the contents of the section to be the negative of the
 793      offset of the location within the section; for such targets
 794      pcrel_offset is FALSE.  Other targets (e.g., m88kbcs or ELF)
 795      simply leave the contents of the section as zero; for such
 796      targets pcrel_offset is TRUE.  If pcrel_offset is FALSE we do not
 797      need to subtract out the offset of the location within the
 798      section (which is just ADDRESS).  */
 799   if (howto->pc_relative)
 800     {
 801       relocation -= (input_section->output_section->vma
 802                      + input_section->output_offset);
 803       if (howto->pcrel_offset)
 804         relocation -= address;
 805     }
 806
 807   return _bfd_ns32k_relocate_contents (howto, input_bfd, relocation,
 808                                        contents + address);
 809 }