bfd/cpu-ns32k.c

   1 /* BFD support for the ns32k architecture.
   2    Copyright (C) 1990-2021 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, 0 }
  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       /* Fall through.  */
 110     case 2:
 111       value = (value << 8) | (*buffer++ & 0xff);
 112       /* Fall through.  */
 113     case 1:
 114       value = (value << 8) | (*buffer++ & 0xff);
 115       break;
 116     default:
 117       abort ();
 118     }
 119   return value;
 120 }
 121
 122 void
 123 _bfd_ns32k_put_immediate (bfd_vma value, bfd_byte *buffer, int size)
 124 {
 125   buffer += size - 1;
 126   switch (size)
 127     {
 128     case 4:
 129       *buffer-- = (value & 0xff); value >>= 8;
 130       *buffer-- = (value & 0xff); value >>= 8;
 131       /* Fall through.  */
 132     case 2:
 133       *buffer-- = (value & 0xff); value >>= 8;
 134       /* Fall through.  */
 135     case 1:
 136       *buffer-- = (value & 0xff); value >>= 8;
 137     }
 138 }
 139
 140 /* This is just like the standard perform_relocation except we
 141    use get_data and put_data which know about the ns32k storage
 142    methods.  This is probably a lot more complicated than it
 143    needs to be!  */
 144
 145 static bfd_reloc_status_type
 146 do_ns32k_reloc (bfd *      abfd,
 147                 arelent *  reloc_entry,
 148                 struct bfd_symbol * symbol,
 149                 void *     data,
 150                 asection * input_section,
 151                 bfd *      output_bfd,
 152                 char **    error_message ATTRIBUTE_UNUSED,
 153                 bfd_vma (* get_data) (bfd_byte *, int),
 154                 void (*    put_data) (bfd_vma, bfd_byte *, int))
 155 {
 156   int overflow = 0;
 157   bfd_vma relocation;
 158   bfd_reloc_status_type flag = bfd_reloc_ok;
 159   bfd_size_type addr = reloc_entry->address;
 160   bfd_vma output_base = 0;
 161   reloc_howto_type *howto = reloc_entry->howto;
 162   asection *reloc_target_output_section;
 163   bfd_byte *location;
 164
 165   if (bfd_is_abs_section (symbol->section)
 166       && output_bfd != (bfd *) NULL)
 167     {
 168       reloc_entry->address += input_section->output_offset;
 169       return bfd_reloc_ok;
 170     }
 171
 172   /* If we are not producing relocatable output, return an error if
 173      the symbol is not defined.  An undefined weak symbol is
 174      considered to have a value of zero (SVR4 ABI, p. 4-27).  */
 175   if (bfd_is_und_section (symbol->section)
 176       && (symbol->flags & BSF_WEAK) == 0
 177       && output_bfd == (bfd *) NULL)
 178     flag = bfd_reloc_undefined;
 179
 180   /* Is the address of the relocation really within the section?  */
 181   if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
 182     return bfd_reloc_outofrange;
 183
 184   /* Work out which section the relocation is targeted at and the
 185      initial relocation command value.  */
 186
 187   /* Get symbol value.  (Common symbols are special.)  */
 188   if (bfd_is_com_section (symbol->section))
 189     relocation = 0;
 190   else
 191     relocation = symbol->value;
 192
 193   reloc_target_output_section = symbol->section->output_section;
 194
 195   /* Convert input-section-relative symbol value to absolute.  */
 196   if (output_bfd != NULL && ! howto->partial_inplace)
 197     output_base = 0;
 198   else
 199     output_base = reloc_target_output_section->vma;
 200
 201   relocation += output_base + symbol->section->output_offset;
 202
 203   /* Add in supplied addend.  */
 204   relocation += reloc_entry->addend;
 205
 206   /* Here the variable relocation holds the final address of the
 207      symbol we are relocating against, plus any addend.  */
 208
 209   if (howto->pc_relative)
 210     {
 211       /* This is a PC relative relocation.  We want to set RELOCATION
 212          to the distance between the address of the symbol and the
 213          location.  RELOCATION is already the address of the symbol.
 214
 215          We start by subtracting the address of the section containing
 216          the location.
 217
 218          If pcrel_offset is set, we must further subtract the position
 219          of the location within the section.  Some targets arrange for
 220          the addend to be the negative of the position of the location
 221          within the section; for example, i386-aout does this.  For
 222          i386-aout, pcrel_offset is FALSE.  Some other targets do not
 223          include the position of the location; for example, ELF.
 224          For those targets, pcrel_offset is TRUE.
 225
 226          If we are producing relocatable output, then we must ensure
 227          that this reloc will be correctly computed when the final
 228          relocation is done.  If pcrel_offset is FALSE we want to wind
 229          up with the negative of the location within the section,
 230          which means we must adjust the existing addend by the change
 231          in the location within the section.  If pcrel_offset is TRUE
 232          we do not want to adjust the existing addend at all.
 233
 234          FIXME: This seems logical to me, but for the case of
 235          producing relocatable output it is not what the code
 236          actually does.  I don't want to change it, because it seems
 237          far too likely that something will break.  */
 238       relocation -=
 239         input_section->output_section->vma + input_section->output_offset;
 240
 241       if (howto->pcrel_offset)
 242         relocation -= reloc_entry->address;
 243     }
 244
 245   if (output_bfd != (bfd *) NULL)
 246     {
 247       if (! howto->partial_inplace)
 248         {
 249           /* This is a partial relocation, and we want to apply the relocation
 250              to the reloc entry rather than the raw data. Modify the reloc
 251              inplace to reflect what we now know.  */
 252           reloc_entry->addend = relocation;
 253           reloc_entry->address += input_section->output_offset;
 254           return flag;
 255         }
 256       else
 257         {
 258           /* This is a partial relocation, but inplace, so modify the
 259              reloc record a bit.
 260
 261              If we've relocated with a symbol with a section, change
 262              into a ref to the section belonging to the symbol.  */
 263
 264           reloc_entry->address += input_section->output_offset;
 265
 266           /* WTF?? */
 267           if (abfd->xvec->flavour == bfd_target_coff_flavour)
 268             {
 269               /* For m68k-coff, the addend was being subtracted twice during
 270                  relocation with -r.  Removing the line below this comment
 271                  fixes that problem; see PR 2953.
 272
 273                  However, Ian wrote the following, regarding removing the line
 274                  below, which explains why it is still enabled:  --djm
 275
 276                  If you put a patch like that into BFD you need to check all
 277                  the COFF linkers.  I am fairly certain that patch will break
 278                  coff-i386 (e.g., SCO); see coff_i386_reloc in coff-i386.c
 279                  where I worked around the problem in a different way.  There
 280                  may very well be a reason that the code works as it does.
 281
 282                  Hmmm.  The first obvious point is that bfd_perform_relocation
 283                  should not have any tests that depend upon the flavour.  It's
 284                  seem like entirely the wrong place for such a thing.  The
 285                  second obvious point is that the current code ignores the
 286                  reloc addend when producing relocatable output for COFF.
 287                  That's peculiar.  In fact, I really have no idea what the
 288                  point of the line you want to remove is.
 289
 290                  A typical COFF reloc subtracts the old value of the symbol
 291                  and adds in the new value to the location in the object file
 292                  (if it's a pc relative reloc it adds the difference between
 293                  the symbol value and the location).  When relocating we need
 294                  to preserve that property.
 295
 296                  BFD handles this by setting the addend to the negative of the
 297                  old value of the symbol.  Unfortunately it handles common
 298                  symbols in a non-standard way (it doesn't subtract the old
 299                  value) but that's a different story (we can't change it
 300                  without losing backward compatibility with old object files)
 301                  (coff-i386 does subtract the old value, to be compatible with
 302                  existing coff-i386 targets, like SCO).
 303
 304                  So everything works fine when not producing relocatable
 305                  output.  When we are producing relocatable output, logically
 306                  we should do exactly what we do when not producing
 307                  relocatable output.  Therefore, your patch is correct.  In
 308                  fact, it should probably always just set reloc_entry->addend
 309                  to 0 for all cases, since it is, in fact, going to add the
 310                  value into the object file.  This won't hurt the COFF code,
 311                  which doesn't use the addend; I'm not sure what it will do
 312                  to other formats (the thing to check for would be whether
 313                  any formats both use the addend and set partial_inplace).
 314
 315                  When I wanted to make coff-i386 produce relocatable output,
 316                  I ran into the problem that you are running into: I wanted
 317                  to remove that line.  Rather than risk it, I made the
 318                  coff-i386 relocs use a special function; it's coff_i386_reloc
 319                  in coff-i386.c.  The function specifically adds the addend
 320                  field into the object file, knowing that bfd_perform_relocation
 321                  is not going to.  If you remove that line, then coff-i386.c
 322                  will wind up adding the addend field in twice.  It's trivial
 323                  to fix; it just needs to be done.
 324
 325                  The problem with removing the line is just that it may break
 326                  some working code.  With BFD it's hard to be sure of anything.
 327                  The right way to deal with this is simply to build and test at
 328                  least all the supported COFF targets.  It should be
 329                  straightforward if time and disk space consuming.  For each
 330                  target:
 331                    1) build the linker
 332                    2) generate some executable, and link it using -r (I would
 333                       probably use paranoia.o and link against newlib/libc.a,
 334                       which for all the supported targets would be available in
 335                       /usr/cygnus/progressive/H-host/target/lib/libc.a).
 336                    3) make the change to reloc.c
 337                    4) rebuild the linker
 338                    5) repeat step 2
 339                    6) if the resulting object files are the same, you have at
 340                       least made it no worse
 341                    7) if they are different you have to figure out which
 342                       version is right.  */
 343               relocation -= reloc_entry->addend;
 344               reloc_entry->addend = 0;
 345             }
 346           else
 347             {
 348               reloc_entry->addend = relocation;
 349             }
 350         }
 351     }
 352   else
 353     {
 354       reloc_entry->addend = 0;
 355     }
 356
 357   /* FIXME: This overflow checking is incomplete, because the value
 358      might have overflowed before we get here.  For a correct check we
 359      need to compute the value in a size larger than bitsize, but we
 360      can't reasonably do that for a reloc the same size as a host
 361      machine word.
 362      FIXME: We should also do overflow checking on the result after
 363      adding in the value contained in the object file.  */
 364   if (howto->complain_on_overflow != complain_overflow_dont)
 365     {
 366       bfd_vma check;
 367
 368       /* Get the value that will be used for the relocation, but
 369          starting at bit position zero.  */
 370       if (howto->rightshift > howto->bitpos)
 371         check = relocation >> (howto->rightshift - howto->bitpos);
 372       else
 373         check = relocation << (howto->bitpos - howto->rightshift);
 374       switch (howto->complain_on_overflow)
 375         {
 376         case complain_overflow_signed:
 377           {
 378             /* Assumes two's complement.  */
 379             bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
 380             bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
 381
 382             /* The above right shift is incorrect for a signed value.
 383                Fix it up by forcing on the upper bits.  */
 384             if (howto->rightshift > howto->bitpos
 385                 && (bfd_signed_vma) relocation < 0)
 386               check |= ((bfd_vma) - 1
 387                         & ~((bfd_vma) - 1
 388                             >> (howto->rightshift - howto->bitpos)));
 389             if ((bfd_signed_vma) check > reloc_signed_max
 390                 || (bfd_signed_vma) check < reloc_signed_min)
 391               flag = bfd_reloc_overflow;
 392           }
 393           break;
 394         case complain_overflow_unsigned:
 395           {
 396             /* Assumes two's complement.  This expression avoids
 397                overflow if howto->bitsize is the number of bits in
 398                bfd_vma.  */
 399             bfd_vma reloc_unsigned_max =
 400             (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 401
 402             if ((bfd_vma) check > reloc_unsigned_max)
 403               flag = bfd_reloc_overflow;
 404           }
 405           break;
 406         case complain_overflow_bitfield:
 407           {
 408             /* Assumes two's complement.  This expression avoids
 409                overflow if howto->bitsize is the number of bits in
 410                bfd_vma.  */
 411             bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 412
 413             if (((bfd_vma) check & ~reloc_bits) != 0
 414                 && (((bfd_vma) check & ~reloc_bits)
 415                     != (-(bfd_vma) 1 & ~reloc_bits)))
 416               {
 417                 /* The above right shift is incorrect for a signed
 418                    value.  See if turning on the upper bits fixes the
 419                    overflow.  */
 420                 if (howto->rightshift > howto->bitpos
 421                     && (bfd_signed_vma) relocation < 0)
 422                   {
 423                     check |= ((bfd_vma) - 1
 424                               & ~((bfd_vma) - 1
 425                                   >> (howto->rightshift - howto->bitpos)));
 426                     if (((bfd_vma) check & ~reloc_bits)
 427                         != (-(bfd_vma) 1 & ~reloc_bits))
 428                       flag = bfd_reloc_overflow;
 429                   }
 430                 else
 431                   flag = bfd_reloc_overflow;
 432               }
 433           }
 434           break;
 435         default:
 436           abort ();
 437         }
 438     }
 439
 440   /* Either we are relocating all the way, or we don't want to apply
 441      the relocation to the reloc entry (probably because there isn't
 442      any room in the output format to describe addends to relocs).  */
 443
 444   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
 445      (OSF version 1.3, compiler version 3.11).  It miscompiles the
 446      following program:
 447
 448      struct str
 449      {
 450        unsigned int i0;
 451      } s = { 0 };
 452
 453      int
 454      main ()
 455      {
 456        unsigned long x;
 457
 458        x = 0x100000000;
 459        x <<= (unsigned long) s.i0;
 460        if (x == 0)
 461          printf ("failed\n");
 462        else
 463          printf ("succeeded (%lx)\n", x);
 464      }
 465      */
 466
 467   relocation >>= (bfd_vma) howto->rightshift;
 468
 469   /* Shift everything up to where it's going to be used.  */
 470   relocation <<= (bfd_vma) howto->bitpos;
 471
 472   /* Wait for the day when all have the mask in them.  */
 473
 474   /* What we do:
 475      i instruction to be left alone
 476      o offset within instruction
 477      r relocation offset to apply
 478      S src mask
 479      D dst mask
 480      N ~dst mask
 481      A part 1
 482      B part 2
 483      R result
 484
 485      Do this:
 486      i i i i i o o o o o        from bfd_get<size>
 487      and           S S S S S    to get the size offset we want
 488      +   r r r r r r r r r r  to get the final value to place
 489      and           D D D D D  to chop to right size
 490      -----------------------
 491      A A A A A
 492      And this:
 493      ...   i i i i i o o o o o  from bfd_get<size>
 494      and   N N N N N            get instruction
 495      -----------------------
 496      ...   B B B B B
 497
 498      And then:
 499      B B B B B
 500      or              A A A A A
 501      -----------------------
 502      R R R R R R R R R R        put into bfd_put<size>.  */
 503
 504   if (howto->negate)
 505     relocation = -relocation;
 506
 507 #define DOIT(x) \
 508   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 509
 510   location = (bfd_byte *) data + addr;
 511   switch (howto->size)
 512     {
 513     case 0:
 514       {
 515         bfd_vma x = get_data (location, 1);
 516         DOIT (x);
 517         put_data ((bfd_vma) x, location, 1);
 518       }
 519       break;
 520
 521     case 1:
 522       if (relocation)
 523         {
 524           bfd_vma x = get_data (location, 2);
 525           DOIT (x);
 526           put_data ((bfd_vma) x, location, 2);
 527         }
 528       break;
 529     case 2:
 530       if (relocation)
 531         {
 532           bfd_vma x = get_data (location, 4);
 533           DOIT (x);
 534           put_data ((bfd_vma) x, location, 4);
 535         }
 536       break;
 537
 538     case 3:
 539       /* Do nothing.  */
 540       break;
 541
 542     case 4:
 543 #ifdef BFD64
 544       if (relocation)
 545         {
 546           bfd_vma x = get_data (location, 8);
 547           DOIT (x);
 548           put_data (x, location, 8);
 549         }
 550 #else
 551       abort ();
 552 #endif
 553       break;
 554     default:
 555       return bfd_reloc_other;
 556     }
 557   if ((howto->complain_on_overflow != complain_overflow_dont) && overflow)
 558     return bfd_reloc_overflow;
 559
 560   return flag;
 561 }
 562
 563 /* Relocate a given location using a given value and howto.  */
 564
 565 bfd_reloc_status_type
 566 _bfd_do_ns32k_reloc_contents (reloc_howto_type *howto,
 567                               bfd *input_bfd ATTRIBUTE_UNUSED,
 568                               bfd_vma relocation,
 569                               bfd_byte *location,
 570                               bfd_vma (*get_data) (bfd_byte *, int),
 571                               void (*put_data) (bfd_vma, bfd_byte *, int))
 572 {
 573   int size;
 574   bfd_vma x;
 575   bfd_boolean overflow;
 576
 577   if (howto->negate)
 578     relocation = -relocation;
 579
 580   /* Get the value we are going to relocate.  */
 581   size = bfd_get_reloc_size (howto);
 582   switch (size)
 583     {
 584     default:
 585       abort ();
 586     case 0:
 587       return bfd_reloc_ok;
 588     case 1:
 589     case 2:
 590     case 4:
 591 #ifdef BFD64
 592     case 8:
 593 #endif
 594       x = get_data (location, size);
 595       break;
 596     }
 597
 598   /* Check for overflow.  FIXME: We may drop bits during the addition
 599      which we don't check for.  We must either check at every single
 600      operation, which would be tedious, or we must do the computations
 601      in a type larger than bfd_vma, which would be inefficient.  */
 602   overflow = FALSE;
 603   if (howto->complain_on_overflow != complain_overflow_dont)
 604     {
 605       bfd_vma check;
 606       bfd_signed_vma signed_check;
 607       bfd_vma add;
 608       bfd_signed_vma signed_add;
 609
 610       if (howto->rightshift == 0)
 611         {
 612           check = relocation;
 613           signed_check = (bfd_signed_vma) relocation;
 614         }
 615       else
 616         {
 617           /* Drop unwanted bits from the value we are relocating to.  */
 618           check = relocation >> howto->rightshift;
 619
 620           /* If this is a signed value, the rightshift just dropped
 621              leading 1 bits (assuming twos complement).  */
 622           if ((bfd_signed_vma) relocation >= 0)
 623             signed_check = check;
 624           else
 625             signed_check = (check
 626                             | ((bfd_vma) - 1
 627                                & ~((bfd_vma) - 1 >> howto->rightshift)));
 628         }
 629
 630       /* Get the value from the object file.  */
 631       add = x & howto->src_mask;
 632
 633       /* Get the value from the object file with an appropriate sign.
 634          The expression involving howto->src_mask isolates the upper
 635          bit of src_mask.  If that bit is set in the value we are
 636          adding, it is negative, and we subtract out that number times
 637          two.  If src_mask includes the highest possible bit, then we
 638          can not get the upper bit, but that does not matter since
 639          signed_add needs no adjustment to become negative in that
 640          case.  */
 641       signed_add = add;
 642       if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0)
 643         signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1;
 644
 645       /* Add the value from the object file, shifted so that it is a
 646          straight number.  */
 647       if (howto->bitpos == 0)
 648         {
 649           check += add;
 650           signed_check += signed_add;
 651         }
 652       else
 653         {
 654           check += add >> howto->bitpos;
 655
 656           /* For the signed case we use ADD, rather than SIGNED_ADD,
 657              to avoid warnings from SVR4 cc.  This is OK since we
 658              explicitly handle the sign bits.  */
 659           if (signed_add >= 0)
 660             signed_check += add >> howto->bitpos;
 661           else
 662             signed_check += ((add >> howto->bitpos)
 663                              | ((bfd_vma) - 1
 664                                 & ~((bfd_vma) - 1 >> howto->bitpos)));
 665         }
 666
 667       switch (howto->complain_on_overflow)
 668         {
 669         case complain_overflow_signed:
 670           {
 671             /* Assumes two's complement.  */
 672             bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
 673             bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
 674
 675             if (signed_check > reloc_signed_max
 676                 || signed_check < reloc_signed_min)
 677               overflow = TRUE;
 678           }
 679           break;
 680         case complain_overflow_unsigned:
 681           {
 682             /* Assumes two's complement.  This expression avoids
 683                overflow if howto->bitsize is the number of bits in
 684                bfd_vma.  */
 685             bfd_vma reloc_unsigned_max =
 686             (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 687
 688             if (check > reloc_unsigned_max)
 689               overflow = TRUE;
 690           }
 691           break;
 692         case complain_overflow_bitfield:
 693           {
 694             /* Assumes two's complement.  This expression avoids
 695                overflow if howto->bitsize is the number of bits in
 696                bfd_vma.  */
 697             bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
 698
 699             if ((check & ~reloc_bits) != 0
 700                 && (((bfd_vma) signed_check & ~reloc_bits)
 701                     != (-(bfd_vma) 1 & ~reloc_bits)))
 702               overflow = TRUE;
 703           }
 704           break;
 705         default:
 706           abort ();
 707         }
 708     }
 709
 710   /* Put RELOCATION in the right bits.  */
 711   relocation >>= (bfd_vma) howto->rightshift;
 712   relocation <<= (bfd_vma) howto->bitpos;
 713
 714   /* Add RELOCATION to the right bits of X.  */
 715   x = ((x & ~howto->dst_mask)
 716        | (((x & howto->src_mask) + relocation) & howto->dst_mask));
 717
 718   /* Put the relocated value back in the object file.  */
 719   switch (size)
 720     {
 721     default:
 722     case 0:
 723       abort ();
 724     case 1:
 725     case 2:
 726     case 4:
 727 #ifdef BFD64
 728     case 8:
 729 #endif
 730       put_data (x, location, size);
 731       break;
 732     }
 733
 734   return overflow ? bfd_reloc_overflow : bfd_reloc_ok;
 735 }
 736
 737 bfd_reloc_status_type
 738 _bfd_ns32k_reloc_disp (bfd *abfd,
 739                        arelent *reloc_entry,
 740                        struct bfd_symbol *symbol,
 741                        void * data,
 742                        asection *input_section,
 743                        bfd *output_bfd,
 744                        char **error_message)
 745 {
 746   return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
 747                          output_bfd, error_message,
 748                          _bfd_ns32k_get_displacement,
 749                          _bfd_ns32k_put_displacement);
 750 }
 751
 752 bfd_reloc_status_type
 753 _bfd_ns32k_reloc_imm (bfd *abfd,
 754                       arelent *reloc_entry,
 755                       struct bfd_symbol *symbol,
 756                       void * data,
 757                       asection *input_section,
 758                       bfd *output_bfd,
 759                       char **error_message)
 760 {
 761   return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
 762                          output_bfd, error_message, _bfd_ns32k_get_immediate,
 763                          _bfd_ns32k_put_immediate);
 764 }
 765
 766 bfd_reloc_status_type
 767 _bfd_ns32k_final_link_relocate (reloc_howto_type *howto,
 768                                 bfd *input_bfd,
 769                                 asection *input_section,
 770                                 bfd_byte *contents,
 771                                 bfd_vma address,
 772                                 bfd_vma value,
 773                                 bfd_vma addend)
 774 {
 775   bfd_vma relocation;
 776
 777   /* Sanity check the address.  */
 778   if (address > bfd_get_section_limit (input_bfd, input_section))
 779     return bfd_reloc_outofrange;
 780
 781   /* This function assumes that we are dealing with a basic relocation
 782      against a symbol.  We want to compute the value of the symbol to
 783      relocate to.  This is just VALUE, the value of the symbol, plus
 784      ADDEND, any addend associated with the reloc.  */
 785   relocation = value + addend;
 786
 787   /* If the relocation is PC relative, we want to set RELOCATION to
 788      the distance between the symbol (currently in RELOCATION) and the
 789      location we are relocating.  If pcrel_offset is FALSE we do not
 790      need to subtract out the offset of the location within the
 791      section (which is just ADDRESS).  */
 792   if (howto->pc_relative)
 793     {
 794       relocation -= (input_section->output_section->vma
 795                      + input_section->output_offset);
 796       if (howto->pcrel_offset)
 797         relocation -= address;
 798     }
 799
 800   return _bfd_ns32k_relocate_contents (howto, input_bfd, relocation,
 801                                        contents + address);
 802 }