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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [bfd/] [cpu-ns32k.c] - Blame information for rev 841

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Line No. Rev Author Line
1 330 jeremybenn
/* BFD support for the ns32k architecture.
2
   Copyright 1990, 1991, 1994, 1995, 1998, 1999, 2000, 2001, 2002, 2003,
3
   2004, 2005, 2007 Free Software Foundation, Inc.
4
   Almost totally rewritten by Ian Dall from initial work
5
   by Andrew Cagney.
6
 
7
   This file is part of BFD, the Binary File Descriptor library.
8
 
9
   This program is free software; you can redistribute it and/or modify
10
   it under the terms of the GNU General Public License as published by
11
   the Free Software Foundation; either version 3 of the License, or
12
   (at your option) any later version.
13
 
14
   This program is distributed in the hope that it will be useful,
15
   but WITHOUT ANY WARRANTY; without even the implied warranty of
16
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17
   GNU General Public License for more details.
18
 
19
   You should have received a copy of the GNU General Public License
20
   along with this program; if not, write to the Free Software
21
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22
   MA 02110-1301, USA.  */
23
 
24
#include "sysdep.h"
25
#include "bfd.h"
26
#include "libbfd.h"
27
#include "ns32k.h"
28
 
29
#define N(machine, printable, d, next)  \
30
{  32, 32, 8, bfd_arch_ns32k, machine, "ns32k",printable,3,d,bfd_default_compatible,bfd_default_scan, 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
static bfd_reloc_status_type do_ns32k_reloc
41
  PARAMS ((bfd *, arelent *, struct bfd_symbol *, PTR, asection *,
42
           bfd *, char **,
43
           bfd_vma (*) (bfd_byte *, int),
44
           void (*) (bfd_vma, bfd_byte *, int)));
45
 
46
bfd_vma
47
_bfd_ns32k_get_displacement (buffer, size)
48
     bfd_byte *buffer;
49
     int size;
50
{
51
  bfd_signed_vma value;
52
 
53
  switch (size)
54
    {
55
    case 1:
56
      value = ((*buffer & 0x7f) ^ 0x40) - 0x40;
57
      break;
58
 
59
    case 2:
60
      value = ((*buffer++ & 0x3f) ^ 0x20) - 0x20;
61
      value = (value << 8) | (0xff & *buffer);
62
      break;
63
 
64
    case 4:
65
      value = ((*buffer++ & 0x3f) ^ 0x20) - 0x20;
66
      value = (value << 8) | (0xff & *buffer++);
67
      value = (value << 8) | (0xff & *buffer++);
68
      value = (value << 8) | (0xff & *buffer);
69
      break;
70
 
71
    default:
72
      abort ();
73
      return 0;
74
    }
75
 
76
  return value;
77
}
78
 
79
void
80
_bfd_ns32k_put_displacement (value, buffer, size)
81
     bfd_vma value;
82
     bfd_byte *buffer;
83
     int size;
84
{
85
  switch (size)
86
    {
87
    case 1:
88
      value &= 0x7f;
89
      *buffer++ = value;
90
      break;
91
 
92
    case 2:
93
      value &= 0x3fff;
94
      value |= 0x8000;
95
      *buffer++ = (value >> 8);
96
      *buffer++ = value;
97
      break;
98
 
99
    case 4:
100
      value |= (bfd_vma) 0xc0000000;
101
      *buffer++ = (value >> 24);
102
      *buffer++ = (value >> 16);
103
      *buffer++ = (value >> 8);
104
      *buffer++ = value;
105
      break;
106
  }
107
  return;
108
}
109
 
110
bfd_vma
111
_bfd_ns32k_get_immediate (buffer, size)
112
     bfd_byte *buffer;
113
     int size;
114
{
115
  bfd_vma value = 0;
116
 
117
  switch (size)
118
    {
119
    case 4:
120
      value = (value << 8) | (*buffer++ & 0xff);
121
      value = (value << 8) | (*buffer++ & 0xff);
122
    case 2:
123
      value = (value << 8) | (*buffer++ & 0xff);
124
    case 1:
125
      value = (value << 8) | (*buffer++ & 0xff);
126
      break;
127
    default:
128
      abort ();
129
    }
130
  return value;
131
}
132
 
133
void
134
_bfd_ns32k_put_immediate (value, buffer, size)
135
     bfd_vma value;
136
     bfd_byte *buffer;
137
     int size;
138
{
139
  buffer += size - 1;
140
  switch (size)
141
    {
142
    case 4:
143
      *buffer-- = (value & 0xff); value >>= 8;
144
      *buffer-- = (value & 0xff); value >>= 8;
145
    case 2:
146
      *buffer-- = (value & 0xff); value >>= 8;
147
    case 1:
148
      *buffer-- = (value & 0xff); value >>= 8;
149
    }
150
}
151
 
152
/* This is just like the standard perform_relocation except we
153
   use get_data and put_data which know about the ns32k storage
154
   methods.  This is probably a lot more complicated than it
155
   needs to be!  */
156
 
157
static bfd_reloc_status_type
158
do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
159
                error_message, get_data, put_data)
160
     bfd *abfd;
161
     arelent *reloc_entry;
162
     struct bfd_symbol *symbol;
163
     PTR data;
164
     asection *input_section;
165
     bfd *output_bfd;
166
     char **error_message ATTRIBUTE_UNUSED;
167
     bfd_vma (*get_data) PARAMS ((bfd_byte *, int));
168
     void (*put_data) PARAMS ((bfd_vma, bfd_byte *, int));
169
{
170
  int overflow = 0;
171
  bfd_vma relocation;
172
  bfd_reloc_status_type flag = bfd_reloc_ok;
173
  bfd_size_type addr = reloc_entry->address;
174
  bfd_vma output_base = 0;
175
  reloc_howto_type *howto = reloc_entry->howto;
176
  asection *reloc_target_output_section;
177
  bfd_byte *location;
178
 
179
  if ((symbol->section == &bfd_abs_section)
180
      && output_bfd != (bfd *) NULL)
181
    {
182
      reloc_entry->address += input_section->output_offset;
183
      return bfd_reloc_ok;
184
    }
185
 
186
  /* If we are not producing relocatable output, return an error if
187
     the symbol is not defined.  An undefined weak symbol is
188
     considered to have a value of zero (SVR4 ABI, p. 4-27).  */
189
  if (symbol->section == &bfd_und_section
190
      && (symbol->flags & BSF_WEAK) == 0
191
      && output_bfd == (bfd *) NULL)
192
    flag = bfd_reloc_undefined;
193
 
194
  /* Is the address of the relocation really within the section?  */
195
  if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
196
    return bfd_reloc_outofrange;
197
 
198
  /* Work out which section the relocation is targeted at and the
199
     initial relocation command value.  */
200
 
201
  /* Get symbol value.  (Common symbols are special.)  */
202
  if (bfd_is_com_section (symbol->section))
203
    relocation = 0;
204
  else
205
    relocation = symbol->value;
206
 
207
  reloc_target_output_section = symbol->section->output_section;
208
 
209
  /* Convert input-section-relative symbol value to absolute.  */
210
  if (output_bfd != NULL && ! howto->partial_inplace)
211
    output_base = 0;
212
  else
213
    output_base = reloc_target_output_section->vma;
214
 
215
  relocation += output_base + symbol->section->output_offset;
216
 
217
  /* Add in supplied addend.  */
218
  relocation += reloc_entry->addend;
219
 
220
  /* Here the variable relocation holds the final address of the
221
     symbol we are relocating against, plus any addend.  */
222
 
223
  if (howto->pc_relative)
224
    {
225
      /* This is a PC relative relocation.  We want to set RELOCATION
226
         to the distance between the address of the symbol and the
227
         location.  RELOCATION is already the address of the symbol.
228
 
229
         We start by subtracting the address of the section containing
230
         the location.
231
 
232
         If pcrel_offset is set, we must further subtract the position
233
         of the location within the section.  Some targets arrange for
234
         the addend to be the negative of the position of the location
235
         within the section; for example, i386-aout does this.  For
236
         i386-aout, pcrel_offset is FALSE.  Some other targets do not
237
         include the position of the location; for example, m88kbcs,
238
         or ELF.  For those targets, pcrel_offset is TRUE.
239
 
240
         If we are producing relocatable output, then we must ensure
241
         that this reloc will be correctly computed when the final
242
         relocation is done.  If pcrel_offset is FALSE we want to wind
243
         up with the negative of the location within the section,
244
         which means we must adjust the existing addend by the change
245
         in the location within the section.  If pcrel_offset is TRUE
246
         we do not want to adjust the existing addend at all.
247
 
248
         FIXME: This seems logical to me, but for the case of
249
         producing relocatable output it is not what the code
250
         actually does.  I don't want to change it, because it seems
251
         far too likely that something will break.  */
252
      relocation -=
253
        input_section->output_section->vma + input_section->output_offset;
254
 
255
      if (howto->pcrel_offset)
256
        relocation -= reloc_entry->address;
257
    }
258
 
259
  if (output_bfd != (bfd *) NULL)
260
    {
261
      if (! howto->partial_inplace)
262
        {
263
          /* This is a partial relocation, and we want to apply the relocation
264
             to the reloc entry rather than the raw data. Modify the reloc
265
             inplace to reflect what we now know.  */
266
          reloc_entry->addend = relocation;
267
          reloc_entry->address += input_section->output_offset;
268
          return flag;
269
        }
270
      else
271
        {
272
          /* This is a partial relocation, but inplace, so modify the
273
             reloc record a bit.
274
 
275
             If we've relocated with a symbol with a section, change
276
             into a ref to the section belonging to the symbol.  */
277
 
278
          reloc_entry->address += input_section->output_offset;
279
 
280
          /* WTF?? */
281
          if (abfd->xvec->flavour == bfd_target_coff_flavour)
282
            {
283
              /* For m68k-coff, the addend was being subtracted twice during
284
                 relocation with -r.  Removing the line below this comment
285
                 fixes that problem; see PR 2953.
286
 
287
                 However, Ian wrote the following, regarding removing the line
288
                 below, which explains why it is still enabled:  --djm
289
 
290
                 If you put a patch like that into BFD you need to check all
291
                 the COFF linkers.  I am fairly certain that patch will break
292
                 coff-i386 (e.g., SCO); see coff_i386_reloc in coff-i386.c
293
                 where I worked around the problem in a different way.  There
294
                 may very well be a reason that the code works as it does.
295
 
296
                 Hmmm.  The first obvious point is that bfd_perform_relocation
297
                 should not have any tests that depend upon the flavour.  It's
298
                 seem like entirely the wrong place for such a thing.  The
299
                 second obvious point is that the current code ignores the
300
                 reloc addend when producing relocatable output for COFF.
301
                 That's peculiar.  In fact, I really have no idea what the
302
                 point of the line you want to remove is.
303
 
304
                 A typical COFF reloc subtracts the old value of the symbol
305
                 and adds in the new value to the location in the object file
306
                 (if it's a pc relative reloc it adds the difference between
307
                 the symbol value and the location).  When relocating we need
308
                 to preserve that property.
309
 
310
                 BFD handles this by setting the addend to the negative of the
311
                 old value of the symbol.  Unfortunately it handles common
312
                 symbols in a non-standard way (it doesn't subtract the old
313
                 value) but that's a different story (we can't change it
314
                 without losing backward compatibility with old object files)
315
                 (coff-i386 does subtract the old value, to be compatible with
316
                 existing coff-i386 targets, like SCO).
317
 
318
                 So everything works fine when not producing relocatable
319
                 output.  When we are producing relocatable output, logically
320
                 we should do exactly what we do when not producing
321
                 relocatable output.  Therefore, your patch is correct.  In
322
                 fact, it should probably always just set reloc_entry->addend
323
                 to 0 for all cases, since it is, in fact, going to add the
324
                 value into the object file.  This won't hurt the COFF code,
325
                 which doesn't use the addend; I'm not sure what it will do
326
                 to other formats (the thing to check for would be whether
327
                 any formats both use the addend and set partial_inplace).
328
 
329
                 When I wanted to make coff-i386 produce relocatable output,
330
                 I ran into the problem that you are running into: I wanted
331
                 to remove that line.  Rather than risk it, I made the
332
                 coff-i386 relocs use a special function; it's coff_i386_reloc
333
                 in coff-i386.c.  The function specifically adds the addend
334
                 field into the object file, knowing that bfd_perform_relocation
335
                 is not going to.  If you remove that line, then coff-i386.c
336
                 will wind up adding the addend field in twice.  It's trivial
337
                 to fix; it just needs to be done.
338
 
339
                 The problem with removing the line is just that it may break
340
                 some working code.  With BFD it's hard to be sure of anything.
341
                 The right way to deal with this is simply to build and test at
342
                 least all the supported COFF targets.  It should be
343
                 straightforward if time and disk space consuming.  For each
344
                 target:
345
                   1) build the linker
346
                   2) generate some executable, and link it using -r (I would
347
                      probably use paranoia.o and link against newlib/libc.a,
348
                      which for all the supported targets would be available in
349
                      /usr/cygnus/progressive/H-host/target/lib/libc.a).
350
                   3) make the change to reloc.c
351
                   4) rebuild the linker
352
                   5) repeat step 2
353
                   6) if the resulting object files are the same, you have at
354
                      least made it no worse
355
                   7) if they are different you have to figure out which
356
                      version is right.  */
357
              relocation -= reloc_entry->addend;
358
              reloc_entry->addend = 0;
359
            }
360
          else
361
            {
362
              reloc_entry->addend = relocation;
363
            }
364
        }
365
    }
366
  else
367
    {
368
      reloc_entry->addend = 0;
369
    }
370
 
371
  /* FIXME: This overflow checking is incomplete, because the value
372
     might have overflowed before we get here.  For a correct check we
373
     need to compute the value in a size larger than bitsize, but we
374
     can't reasonably do that for a reloc the same size as a host
375
     machine word.
376
     FIXME: We should also do overflow checking on the result after
377
     adding in the value contained in the object file.  */
378
  if (howto->complain_on_overflow != complain_overflow_dont)
379
    {
380
      bfd_vma check;
381
 
382
      /* Get the value that will be used for the relocation, but
383
         starting at bit position zero.  */
384
      if (howto->rightshift > howto->bitpos)
385
        check = relocation >> (howto->rightshift - howto->bitpos);
386
      else
387
        check = relocation << (howto->bitpos - howto->rightshift);
388
      switch (howto->complain_on_overflow)
389
        {
390
        case complain_overflow_signed:
391
          {
392
            /* Assumes two's complement.  */
393
            bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
394
            bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
395
 
396
            /* The above right shift is incorrect for a signed value.
397
               Fix it up by forcing on the upper bits.  */
398
            if (howto->rightshift > howto->bitpos
399
                && (bfd_signed_vma) relocation < 0)
400
              check |= ((bfd_vma) - 1
401
                        & ~((bfd_vma) - 1
402
                            >> (howto->rightshift - howto->bitpos)));
403
            if ((bfd_signed_vma) check > reloc_signed_max
404
                || (bfd_signed_vma) check < reloc_signed_min)
405
              flag = bfd_reloc_overflow;
406
          }
407
          break;
408
        case complain_overflow_unsigned:
409
          {
410
            /* Assumes two's complement.  This expression avoids
411
               overflow if howto->bitsize is the number of bits in
412
               bfd_vma.  */
413
            bfd_vma reloc_unsigned_max =
414
            (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
415
 
416
            if ((bfd_vma) check > reloc_unsigned_max)
417
              flag = bfd_reloc_overflow;
418
          }
419
          break;
420
        case complain_overflow_bitfield:
421
          {
422
            /* Assumes two's complement.  This expression avoids
423
               overflow if howto->bitsize is the number of bits in
424
               bfd_vma.  */
425
            bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
426
 
427
            if (((bfd_vma) check & ~reloc_bits) != 0
428
                && (((bfd_vma) check & ~reloc_bits)
429
                    != (-(bfd_vma) 1 & ~reloc_bits)))
430
              {
431
                /* The above right shift is incorrect for a signed
432
                   value.  See if turning on the upper bits fixes the
433
                   overflow.  */
434
                if (howto->rightshift > howto->bitpos
435
                    && (bfd_signed_vma) relocation < 0)
436
                  {
437
                    check |= ((bfd_vma) - 1
438
                              & ~((bfd_vma) - 1
439
                                  >> (howto->rightshift - howto->bitpos)));
440
                    if (((bfd_vma) check & ~reloc_bits)
441
                        != (-(bfd_vma) 1 & ~reloc_bits))
442
                      flag = bfd_reloc_overflow;
443
                  }
444
                else
445
                  flag = bfd_reloc_overflow;
446
              }
447
          }
448
          break;
449
        default:
450
          abort ();
451
        }
452
    }
453
 
454
  /* Either we are relocating all the way, or we don't want to apply
455
     the relocation to the reloc entry (probably because there isn't
456
     any room in the output format to describe addends to relocs).  */
457
 
458
  /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
459
     (OSF version 1.3, compiler version 3.11).  It miscompiles the
460
     following program:
461
 
462
     struct str
463
     {
464
       unsigned int i0;
465
     } s = { 0 };
466
 
467
     int
468
     main ()
469
     {
470
       unsigned long x;
471
 
472
       x = 0x100000000;
473
       x <<= (unsigned long) s.i0;
474
       if (x == 0)
475
         printf ("failed\n");
476
       else
477
         printf ("succeeded (%lx)\n", x);
478
     }
479
     */
480
 
481
  relocation >>= (bfd_vma) howto->rightshift;
482
 
483
  /* Shift everything up to where it's going to be used.  */
484
  relocation <<= (bfd_vma) howto->bitpos;
485
 
486
  /* Wait for the day when all have the mask in them.  */
487
 
488
  /* What we do:
489
     i instruction to be left alone
490
     o offset within instruction
491
     r relocation offset to apply
492
     S src mask
493
     D dst mask
494
     N ~dst mask
495
     A part 1
496
     B part 2
497
     R result
498
 
499
     Do this:
500
     i i i i i o o o o o        from bfd_get<size>
501
     and           S S S S S    to get the size offset we want
502
     +   r r r r r r r r r r  to get the final value to place
503
     and           D D D D D  to chop to right size
504
     -----------------------
505
     A A A A A
506
     And this:
507
     ...   i i i i i o o o o o  from bfd_get<size>
508
     and   N N N N N            get instruction
509
     -----------------------
510
     ...   B B B B B
511
 
512
     And then:
513
     B B B B B
514
     or              A A A A A
515
     -----------------------
516
     R R R R R R R R R R        put into bfd_put<size>.  */
517
 
518
#define DOIT(x) \
519
  x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
520
 
521
  location = (bfd_byte *) data + addr;
522
  switch (howto->size)
523
    {
524
    case 0:
525
      {
526
        bfd_vma x = get_data (location, 1);
527
        DOIT (x);
528
        put_data ((bfd_vma) x, location, 1);
529
      }
530
      break;
531
 
532
    case 1:
533
      if (relocation)
534
        {
535
          bfd_vma x = get_data (location, 2);
536
          DOIT (x);
537
          put_data ((bfd_vma) x, location, 2);
538
        }
539
      break;
540
    case 2:
541
      if (relocation)
542
        {
543
          bfd_vma x = get_data (location, 4);
544
          DOIT (x);
545
          put_data ((bfd_vma) x, location, 4);
546
        }
547
      break;
548
    case -2:
549
      {
550
        bfd_vma x = get_data (location, 4);
551
        relocation = -relocation;
552
        DOIT(x);
553
        put_data ((bfd_vma) x, location, 4);
554
      }
555
      break;
556
 
557
    case 3:
558
      /* Do nothing.  */
559
      break;
560
 
561
    case 4:
562
#ifdef BFD64
563
      if (relocation)
564
        {
565
          bfd_vma x = get_data (location, 8);
566
          DOIT (x);
567
          put_data (x, location, 8);
568
        }
569
#else
570
      abort ();
571
#endif
572
      break;
573
    default:
574
      return bfd_reloc_other;
575
    }
576
  if ((howto->complain_on_overflow != complain_overflow_dont) && overflow)
577
    return bfd_reloc_overflow;
578
 
579
  return flag;
580
}
581
 
582
/* Relocate a given location using a given value and howto.  */
583
 
584
bfd_reloc_status_type
585
_bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation, location,
586
                              get_data, put_data)
587
     reloc_howto_type *howto;
588
     bfd *input_bfd ATTRIBUTE_UNUSED;
589
     bfd_vma relocation;
590
     bfd_byte *location;
591
     bfd_vma (*get_data) PARAMS ((bfd_byte *, int));
592
     void (*put_data) PARAMS ((bfd_vma, bfd_byte *, int));
593
{
594
  int size;
595
  bfd_vma x;
596
  bfd_boolean overflow;
597
 
598
  /* If the size is negative, negate RELOCATION.  This isn't very
599
     general.  */
600
  if (howto->size < 0)
601
    relocation = -relocation;
602
 
603
  /* Get the value we are going to relocate.  */
604
  size = bfd_get_reloc_size (howto);
605
  switch (size)
606
    {
607
    default:
608
    case 0:
609
      abort ();
610
    case 1:
611
    case 2:
612
    case 4:
613
#ifdef BFD64
614
    case 8:
615
#endif
616
      x = get_data (location, size);
617
      break;
618
    }
619
 
620
  /* Check for overflow.  FIXME: We may drop bits during the addition
621
     which we don't check for.  We must either check at every single
622
     operation, which would be tedious, or we must do the computations
623
     in a type larger than bfd_vma, which would be inefficient.  */
624
  overflow = FALSE;
625
  if (howto->complain_on_overflow != complain_overflow_dont)
626
    {
627
      bfd_vma check;
628
      bfd_signed_vma signed_check;
629
      bfd_vma add;
630
      bfd_signed_vma signed_add;
631
 
632
      if (howto->rightshift == 0)
633
        {
634
          check = relocation;
635
          signed_check = (bfd_signed_vma) relocation;
636
        }
637
      else
638
        {
639
          /* Drop unwanted bits from the value we are relocating to.  */
640
          check = relocation >> howto->rightshift;
641
 
642
          /* If this is a signed value, the rightshift just dropped
643
             leading 1 bits (assuming twos complement).  */
644
          if ((bfd_signed_vma) relocation >= 0)
645
            signed_check = check;
646
          else
647
            signed_check = (check
648
                            | ((bfd_vma) - 1
649
                               & ~((bfd_vma) - 1 >> howto->rightshift)));
650
        }
651
 
652
      /* Get the value from the object file.  */
653
      add = x & howto->src_mask;
654
 
655
      /* Get the value from the object file with an appropriate sign.
656
         The expression involving howto->src_mask isolates the upper
657
         bit of src_mask.  If that bit is set in the value we are
658
         adding, it is negative, and we subtract out that number times
659
         two.  If src_mask includes the highest possible bit, then we
660
         can not get the upper bit, but that does not matter since
661
         signed_add needs no adjustment to become negative in that
662
         case.  */
663
      signed_add = add;
664
      if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0)
665
        signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1;
666
 
667
      /* Add the value from the object file, shifted so that it is a
668
         straight number.  */
669
      if (howto->bitpos == 0)
670
        {
671
          check += add;
672
          signed_check += signed_add;
673
        }
674
      else
675
        {
676
          check += add >> howto->bitpos;
677
 
678
          /* For the signed case we use ADD, rather than SIGNED_ADD,
679
             to avoid warnings from SVR4 cc.  This is OK since we
680
             explicitly handle the sign bits.  */
681
          if (signed_add >= 0)
682
            signed_check += add >> howto->bitpos;
683
          else
684
            signed_check += ((add >> howto->bitpos)
685
                             | ((bfd_vma) - 1
686
                                & ~((bfd_vma) - 1 >> howto->bitpos)));
687
        }
688
 
689
      switch (howto->complain_on_overflow)
690
        {
691
        case complain_overflow_signed:
692
          {
693
            /* Assumes two's complement.  */
694
            bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
695
            bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
696
 
697
            if (signed_check > reloc_signed_max
698
                || signed_check < reloc_signed_min)
699
              overflow = TRUE;
700
          }
701
          break;
702
        case complain_overflow_unsigned:
703
          {
704
            /* Assumes two's complement.  This expression avoids
705
               overflow if howto->bitsize is the number of bits in
706
               bfd_vma.  */
707
            bfd_vma reloc_unsigned_max =
708
            (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
709
 
710
            if (check > reloc_unsigned_max)
711
              overflow = TRUE;
712
          }
713
          break;
714
        case complain_overflow_bitfield:
715
          {
716
            /* Assumes two's complement.  This expression avoids
717
               overflow if howto->bitsize is the number of bits in
718
               bfd_vma.  */
719
            bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
720
 
721
            if ((check & ~reloc_bits) != 0
722
                && (((bfd_vma) signed_check & ~reloc_bits)
723
                    != (-(bfd_vma) 1 & ~reloc_bits)))
724
              overflow = TRUE;
725
          }
726
          break;
727
        default:
728
          abort ();
729
        }
730
    }
731
 
732
  /* Put RELOCATION in the right bits.  */
733
  relocation >>= (bfd_vma) howto->rightshift;
734
  relocation <<= (bfd_vma) howto->bitpos;
735
 
736
  /* Add RELOCATION to the right bits of X.  */
737
  x = ((x & ~howto->dst_mask)
738
       | (((x & howto->src_mask) + relocation) & howto->dst_mask));
739
 
740
  /* Put the relocated value back in the object file.  */
741
  switch (size)
742
    {
743
    default:
744
    case 0:
745
      abort ();
746
    case 1:
747
    case 2:
748
    case 4:
749
#ifdef BFD64
750
    case 8:
751
#endif
752
      put_data (x, location, size);
753
      break;
754
    }
755
 
756
  return overflow ? bfd_reloc_overflow : bfd_reloc_ok;
757
}
758
 
759
bfd_reloc_status_type
760
_bfd_ns32k_reloc_disp (abfd, reloc_entry, symbol, data, input_section,
761
                       output_bfd, error_message)
762
     bfd *abfd;
763
     arelent *reloc_entry;
764
     struct bfd_symbol *symbol;
765
     PTR data;
766
     asection *input_section;
767
     bfd *output_bfd;
768
     char **error_message;
769
{
770
  return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
771
                         output_bfd, error_message,
772
                         _bfd_ns32k_get_displacement,
773
                         _bfd_ns32k_put_displacement);
774
}
775
 
776
bfd_reloc_status_type
777
_bfd_ns32k_reloc_imm (abfd, reloc_entry, symbol, data, input_section,
778
                      output_bfd, error_message)
779
     bfd *abfd;
780
     arelent *reloc_entry;
781
     struct bfd_symbol *symbol;
782
     PTR data;
783
     asection *input_section;
784
     bfd *output_bfd;
785
     char **error_message;
786
{
787
  return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section,
788
                         output_bfd, error_message, _bfd_ns32k_get_immediate,
789
                         _bfd_ns32k_put_immediate);
790
}
791
 
792
bfd_reloc_status_type
793
_bfd_ns32k_final_link_relocate (howto, input_bfd, input_section, contents,
794
                                address, value, addend)
795
     reloc_howto_type *howto;
796
     bfd *input_bfd;
797
     asection *input_section;
798
     bfd_byte *contents;
799
     bfd_vma address;
800
     bfd_vma value;
801
     bfd_vma addend;
802
{
803
  bfd_vma relocation;
804
 
805
  /* Sanity check the address.  */
806
  if (address > bfd_get_section_limit (input_bfd, input_section))
807
    return bfd_reloc_outofrange;
808
 
809
  /* This function assumes that we are dealing with a basic relocation
810
     against a symbol.  We want to compute the value of the symbol to
811
     relocate to.  This is just VALUE, the value of the symbol, plus
812
     ADDEND, any addend associated with the reloc.  */
813
  relocation = value + addend;
814
 
815
  /* If the relocation is PC relative, we want to set RELOCATION to
816
     the distance between the symbol (currently in RELOCATION) and the
817
     location we are relocating.  Some targets (e.g., i386-aout)
818
     arrange for the contents of the section to be the negative of the
819
     offset of the location within the section; for such targets
820
     pcrel_offset is FALSE.  Other targets (e.g., m88kbcs or ELF)
821
     simply leave the contents of the section as zero; for such
822
     targets pcrel_offset is TRUE.  If pcrel_offset is FALSE we do not
823
     need to subtract out the offset of the location within the
824
     section (which is just ADDRESS).  */
825
  if (howto->pc_relative)
826
    {
827
      relocation -= (input_section->output_section->vma
828
                     + input_section->output_offset);
829
      if (howto->pcrel_offset)
830
        relocation -= address;
831
    }
832
 
833
  return _bfd_ns32k_relocate_contents (howto, input_bfd, relocation,
834
                                       contents + address);
835
}

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