aboutsummaryrefslogtreecommitdiff
path: root/bfd/riscix.c
blob: fb780e2e7614d0ff8497bde56f05091707de34f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
/* BFD back-end for RISC iX (Acorn, arm) binaries.
   Copyright (C) 1994-2015 Free Software Foundation, Inc.
   Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */


/* RISC iX overloads the MAGIC field to indicate more than just the usual
   [ZNO]MAGIC values.  Also included are squeezing information and
   shared library usage.  */

/* The following come from the man page.  */
#define SHLIBLEN 60

#define MF_IMPURE       00200
#define MF_SQUEEZED     01000
#define MF_USES_SL      02000
#define MF_IS_SL        04000

/* Common combinations.  */

/* Demand load (impure text).  */
#define IMAGIC          (MF_IMPURE | ZMAGIC)

/* OMAGIC with large header.
   May contain a ref to a shared lib required by the object.  */
#define SPOMAGIC        (MF_USES_SL | OMAGIC)

/* A reference to a shared library.
   The text portion of the object contains "overflow text" from
   the shared library to be linked in with an object.  */
#define SLOMAGIC        (MF_IS_SL | OMAGIC)

/* Sqeezed demand paged.
   NOTE: This interpretation of QMAGIC seems to be at variance
   with that used on other architectures.  */
#define QMAGIC          (MF_SQUEEZED | ZMAGIC)

/* Program which uses sl.  */
#define SPZMAGIC        (MF_USES_SL | ZMAGIC)

/* Sqeezed ditto.  */
#define SPQMAGIC        (MF_USES_SL | QMAGIC)

/* Shared lib part of prog.  */
#define SLZMAGIC        (MF_IS_SL | ZMAGIC)

/* Sl which uses another.  */
#define SLPZMAGIC       (MF_USES_SL | SLZMAGIC)

#define N_SHARED_LIB(x) ((x)->a_info & MF_USES_SL)

/* Only a pure OMAGIC file has the minimal header.  */
#define N_TXTOFF(x)		\
 ((x)->a_info == OMAGIC		\
  ? 32				\
  : (N_MAGIC(x) == ZMAGIC	\
     ? TARGET_PAGE_SIZE		\
     : 999))

#define N_TXTADDR(x)							     \
  (N_MAGIC(x) != ZMAGIC							     \
   ? (bfd_vma) 0 /* object file or NMAGIC */				     \
   /* Programs with shared libs are loaded at the first page after all the   \
      text segments of the shared library programs.  Without looking this    \
      up we can't know exactly what the address will be.  A reasonable guess \
      is that a_entry will be in the first page of the executable.  */	     \
   : (N_SHARED_LIB(x)							     \
      ? ((x)->a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1))		     \
      : (bfd_vma) TEXT_START_ADDR))

#define N_SYMOFF(x) \
  (N_TXTOFF (x) + (x)->a_text + (x)->a_data + (x)->a_trsize + (x)->a_drsize)

#define N_STROFF(x) (N_SYMOFF (x) + (x)->a_syms)

#define TEXT_START_ADDR   32768
#define TARGET_PAGE_SIZE  32768
#define SEGMENT_SIZE      TARGET_PAGE_SIZE
#define DEFAULT_ARCH      bfd_arch_arm

/* Do not "beautify" the CONCAT* macro args.  Traditional C will not
   remove whitespace added here, and thus will fail to concatenate
   the tokens.  */
#define MY(OP) CONCAT2 (arm_aout_riscix_,OP)
#define TARGETNAME "a.out-riscix"
#define N_BADMAG(x) ((((x)->a_info & ~007200) != ZMAGIC) \
                  && (((x)->a_info & ~006000) != OMAGIC) \
                  && ((x)->a_info != NMAGIC))
#define N_MAGIC(x) ((x)->a_info & ~07200)

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"

#define WRITE_HEADERS(abfd, execp)					    \
  {									    \
    if (adata (abfd).magic == undecided_magic)				    \
      NAME (aout, adjust_sizes_and_vmas) (abfd);			    \
    									    \
    execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE;	    \
    execp->a_entry = bfd_get_start_address (abfd);			    \
    									    \
    execp->a_trsize = ((obj_textsec (abfd)->reloc_count) *		    \
		       obj_reloc_entry_size (abfd));			    \
    execp->a_drsize = ((obj_datasec (abfd)->reloc_count) *		    \
		       obj_reloc_entry_size (abfd));			    \
    NAME (aout, swap_exec_header_out) (abfd, execp, & exec_bytes);	    \
    									    \
    if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0			    \
	|| bfd_bwrite ((void *) & exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE,  \
		      abfd) != EXEC_BYTES_SIZE)				    \
      return FALSE;							    \
    /* Now write out reloc info, followed by syms and strings.  */	    \
									    \
    if (bfd_get_outsymbols (abfd) != NULL			    	    \
	&& bfd_get_symcount (abfd) != 0)				    \
      {									    \
	if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (execp)), SEEK_SET) != 0)  \
	  return FALSE;							    \
									    \
	if (! NAME (aout, write_syms) (abfd))				    \
          return FALSE;							    \
									    \
	if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (execp)), SEEK_SET) != 0) \
	  return FALSE;							    \
									    \
	if (! riscix_squirt_out_relocs (abfd, obj_textsec (abfd)))	    \
	  return FALSE;							    \
	if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (execp)), SEEK_SET) != 0) \
	  return FALSE;							    \
									    \
	if (!NAME (aout, squirt_out_relocs) (abfd, obj_datasec (abfd)))	    \
	  return FALSE;							    \
      }									    \
  }

#include "libaout.h"
#include "aout/aout64.h"

static bfd_reloc_status_type
riscix_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED,
			  arelent *reloc_entry ATTRIBUTE_UNUSED,
			  asymbol *symbol ATTRIBUTE_UNUSED,
			  void * data ATTRIBUTE_UNUSED,
			  asection *input_section ATTRIBUTE_UNUSED,
			  bfd *output_bfd ATTRIBUTE_UNUSED,
			  char **error_message ATTRIBUTE_UNUSED)
{
  /* This is dead simple at present.  */
  return bfd_reloc_ok;
}

static bfd_reloc_status_type riscix_fix_pcrel_26 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static const bfd_target *arm_aout_riscix_callback (bfd *);

static reloc_howto_type riscix_std_reloc_howto[] =
{
  /* Type              rs size bsz  pcrel bitpos ovrf                     sf name     part_inpl readmask  setmask    pcdone */
  HOWTO( 0,              0,  0,   8,  FALSE, 0, complain_overflow_bitfield,0,"8",         TRUE, 0x000000ff,0x000000ff, FALSE),
  HOWTO( 1,              0,  1,   16, FALSE, 0, complain_overflow_bitfield,0,"16",        TRUE, 0x0000ffff,0x0000ffff, FALSE),
  HOWTO( 2,              0,  2,   32, FALSE, 0, complain_overflow_bitfield,0,"32",        TRUE, 0xffffffff,0xffffffff, FALSE),
  HOWTO( 3,              2,  3,   26, TRUE,  0, complain_overflow_signed,  riscix_fix_pcrel_26 , "ARM26",      TRUE, 0x00ffffff,0x00ffffff, FALSE),
  HOWTO( 4,              0,  0,   8,  TRUE,  0, complain_overflow_signed,  0,"DISP8",     TRUE, 0x000000ff,0x000000ff, TRUE),
  HOWTO( 5,              0,  1,   16, TRUE,  0, complain_overflow_signed,  0,"DISP16",    TRUE, 0x0000ffff,0x0000ffff, TRUE),
  HOWTO( 6,              0,  2,   32, TRUE,  0, complain_overflow_signed,  0,"DISP32",    TRUE, 0xffffffff,0xffffffff, TRUE),
  HOWTO( 7,              2,  3,   26, FALSE, 0, complain_overflow_signed,  riscix_fix_pcrel_26_done, "ARM26D",TRUE,0x00ffffff,0x00ffffff, FALSE),
  EMPTY_HOWTO (-1),
  HOWTO( 9,              0, -1,   16, FALSE, 0, complain_overflow_bitfield,0,"NEG16",     TRUE, 0x0000ffff,0x0000ffff, FALSE),
  HOWTO( 10,              0, -2,  32, FALSE, 0, complain_overflow_bitfield,0,"NEG32",     TRUE, 0xffffffff,0xffffffff, FALSE)
};

#define RISCIX_TABLE_SIZE \
  (sizeof (riscix_std_reloc_howto) / sizeof (reloc_howto_type))

static bfd_reloc_status_type
riscix_fix_pcrel_26 (bfd *abfd,
		     arelent *reloc_entry,
		     asymbol *symbol,
		     void * data,
		     asection *input_section,
		     bfd *output_bfd,
		     char **error_message ATTRIBUTE_UNUSED)
{
  bfd_vma relocation;
  bfd_size_type addr = reloc_entry->address;
  long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
  bfd_reloc_status_type flag = bfd_reloc_ok;

  /* If this is an undefined symbol, return error.  */
  if (bfd_is_und_section (symbol->section)
      && (symbol->flags & BSF_WEAK) == 0)
    return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;

  /* If the sections are different, and we are doing a partial relocation,
     just ignore it for now.  */
  if (symbol->section->name != input_section->name
      && output_bfd != NULL)
    return bfd_reloc_continue;

  relocation = (target & 0x00ffffff) << 2;
  relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend.  */
  relocation += symbol->value;
  relocation += symbol->section->output_section->vma;
  relocation += symbol->section->output_offset;
  relocation += reloc_entry->addend;
  relocation -= input_section->output_section->vma;
  relocation -= input_section->output_offset;
  relocation -= addr;
  if (relocation & 3)
    return bfd_reloc_overflow;

  /* Check for overflow.  */
  if (relocation & 0x02000000)
    {
      if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
	flag = bfd_reloc_overflow;
    }
  else if (relocation & ~ (bfd_vma) 0x03ffffff)
    flag = bfd_reloc_overflow;

  target &= ~0x00ffffff;
  target |= (relocation >> 2) & 0x00ffffff;
  bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);

  /* Now the ARM magic... Change the reloc type so that it is marked as done.
     Strictly this is only necessary if we are doing a partial relocation.  */
  reloc_entry->howto = &riscix_std_reloc_howto[7];

  return flag;
}

static reloc_howto_type *
riscix_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code)
{
#define ASTD(i,j)       case i: return &riscix_std_reloc_howto[j]
  if (code == BFD_RELOC_CTOR)
    switch (bfd_arch_bits_per_address (abfd))
      {
      case 32:
        code = BFD_RELOC_32;
        break;
      default:
	return NULL;
      }

  switch (code)
    {
      ASTD (BFD_RELOC_16, 1);
      ASTD (BFD_RELOC_32, 2);
      ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);
      ASTD (BFD_RELOC_8_PCREL, 4);
      ASTD (BFD_RELOC_16_PCREL, 5);
      ASTD (BFD_RELOC_32_PCREL, 6);
    default:
      return NULL;
    }
}

static reloc_howto_type *
riscix_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			  const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (riscix_std_reloc_howto) / sizeof (riscix_std_reloc_howto[0]);
       i++)
    if (riscix_std_reloc_howto[i].name != NULL
	&& strcasecmp (riscix_std_reloc_howto[i].name, r_name) == 0)
      return &riscix_std_reloc_howto[i];

  return NULL;
}

#define MY_bfd_link_hash_table_create  _bfd_generic_link_hash_table_create
#define MY_bfd_link_add_symbols        _bfd_generic_link_add_symbols
#define MY_final_link_callback         should_not_be_used
#define MY_bfd_final_link              _bfd_generic_final_link

#define MY_bfd_reloc_type_lookup       riscix_reloc_type_lookup
#define MY_bfd_reloc_name_lookup       riscix_reloc_name_lookup
#define MY_canonicalize_reloc          arm_aout_riscix_canonicalize_reloc
#define MY_object_p                    arm_aout_riscix_object_p

static void
riscix_swap_std_reloc_out (bfd *abfd,
			   arelent *g,
			   struct reloc_std_external *natptr)
{
  int r_index;
  asymbol *sym = *(g->sym_ptr_ptr);
  int r_extern;
  int r_length;
  int r_pcrel;
  int r_neg = 0;	/* Negative relocs use the BASEREL bit.  */
  asection *output_section = sym->section->output_section;

  PUT_WORD(abfd, g->address, natptr->r_address);

  r_length = g->howto->size ;   /* Size as a power of two.  */
  if (r_length < 0)
    {
      r_length = -r_length;
      r_neg = 1;
    }

  r_pcrel  = (int) g->howto->pc_relative; /* Relative to PC?  */

  /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the
     relocation has been done already (Only for the 26-bit one I think)?  */
  if (r_length == 3)
    r_pcrel = r_pcrel ? 0 : 1;

  /* Name was clobbered by aout_write_syms to be symbol index.  */

  /* If this relocation is relative to a symbol then set the
     r_index to the symbols index, and the r_extern bit.

     Absolute symbols can come in in two ways, either as an offset
     from the abs section, or as a symbol which has an abs value.
     check for that here.  */

  if (bfd_is_com_section (output_section)
      || bfd_is_abs_section (output_section)
      || bfd_is_und_section (output_section))
    {
      if (bfd_abs_section_ptr->symbol == sym)
	{
	  /* Whoops, looked like an abs symbol, but is really an offset
	     from the abs section.  */
	  r_index = 0;
	  r_extern = 0;
	}
      else
	{
	  /* Fill in symbol.  */
	  r_extern = 1;
	  r_index = (*g->sym_ptr_ptr)->udata.i;
	}
    }
  else
    {
      /* Just an ordinary section.  */
      r_extern = 0;
      r_index  = output_section->target_index;
    }

  /* Now the fun stuff.  */
  if (bfd_header_big_endian (abfd))
    {
      natptr->r_index[0] = r_index >> 16;
      natptr->r_index[1] = r_index >> 8;
      natptr->r_index[2] = r_index;
      natptr->r_type[0] =
	(  (r_extern ?   RELOC_STD_BITS_EXTERN_BIG: 0)
	 | (r_pcrel  ?   RELOC_STD_BITS_PCREL_BIG: 0)
	 | (r_neg    ?   RELOC_STD_BITS_BASEREL_BIG: 0)
	 | (r_length <<  RELOC_STD_BITS_LENGTH_SH_BIG));
    }
  else
    {
      natptr->r_index[2] = r_index >> 16;
      natptr->r_index[1] = r_index >> 8;
      natptr->r_index[0] = r_index;
      natptr->r_type[0] =
	(  (r_extern ?   RELOC_STD_BITS_EXTERN_LITTLE: 0)
	 | (r_pcrel  ?   RELOC_STD_BITS_PCREL_LITTLE: 0)
	 | (r_neg    ?   RELOC_STD_BITS_BASEREL_LITTLE: 0)
	 | (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE));
    }
}

static bfd_boolean
riscix_squirt_out_relocs (bfd *abfd, asection *section)
{
  arelent **generic;
  unsigned char *native, *natptr;
  size_t each_size;
  unsigned int count = section->reloc_count;
  bfd_size_type natsize;

  if (count == 0)
    return TRUE;

  each_size = obj_reloc_entry_size (abfd);
  natsize = each_size;
  natsize *= count;
  native = bfd_zalloc (abfd, natsize);
  if (!native)
    return FALSE;

  generic = section->orelocation;

  for (natptr = native;
       count != 0;
       --count, natptr += each_size, ++generic)
    riscix_swap_std_reloc_out (abfd, *generic,
			       (struct reloc_std_external *) natptr);

  if (bfd_bwrite ((void *) native, natsize, abfd) != natsize)
    {
      bfd_release (abfd, native);
      return FALSE;
    }

  bfd_release (abfd, native);
  return TRUE;
}

/* This is just like the standard aoutx.h version but we need to do our
   own mapping of external reloc type values to howto entries.  */

static long
MY (canonicalize_reloc) (bfd *abfd,
			 sec_ptr section,
			 arelent **relptr,
			 asymbol **symbols)
{
  arelent *tblptr = section->relocation;
  unsigned int count, c;
  extern reloc_howto_type NAME (aout, std_howto_table)[];

  /* If we have already read in the relocation table, return the values.  */
  if (section->flags & SEC_CONSTRUCTOR)
    {
      arelent_chain *chain = section->constructor_chain;

      for (count = 0; count < section->reloc_count; count++)
	{
	  *relptr++ = &chain->relent;
	  chain = chain->next;
	}
      *relptr = 0;
      return section->reloc_count;
    }

  if (tblptr && section->reloc_count)
    {
      for (count = 0; count++ < section->reloc_count;)
	*relptr++ = tblptr++;
      *relptr = 0;
      return section->reloc_count;
    }

  if (!NAME (aout, slurp_reloc_table) (abfd, section, symbols))
    return -1;
  tblptr = section->relocation;

  /* Fix up howto entries.  */
  for (count = 0; count++ < section->reloc_count;)
    {
      c = tblptr->howto - NAME(aout,std_howto_table);
      BFD_ASSERT (c < RISCIX_TABLE_SIZE);
      tblptr->howto = &riscix_std_reloc_howto[c];

      *relptr++ = tblptr++;
    }
  *relptr = 0;
  return section->reloc_count;
}

/* This is the same as NAME(aout,some_aout_object_p), but has different
   expansions of the macro definitions.  */

static const bfd_target *
riscix_some_aout_object_p (bfd *abfd,
			   struct internal_exec *execp,
			   const bfd_target *(*callback_to_real_object_p) (bfd *))
{
  struct aout_data_struct *rawptr, *oldrawptr;
  const bfd_target *result;
  bfd_size_type amt = sizeof (struct aout_data_struct);

  rawptr = bfd_zalloc (abfd, amt);

  if (rawptr == NULL)
    return NULL;

  oldrawptr = abfd->tdata.aout_data;
  abfd->tdata.aout_data = rawptr;

  /* Copy the contents of the old tdata struct.
     In particular, we want the subformat, since for hpux it was set in
     hp300hpux.c:swap_exec_header_in and will be used in
     hp300hpux.c:callback.  */
  if (oldrawptr != NULL)
    *abfd->tdata.aout_data = *oldrawptr;

  abfd->tdata.aout_data->a.hdr = &rawptr->e;
  /* Copy in the internal_exec struct.  */
  *(abfd->tdata.aout_data->a.hdr) = *execp;
  execp = abfd->tdata.aout_data->a.hdr;

  /* Set the file flags.  */
  abfd->flags = BFD_NO_FLAGS;
  if (execp->a_drsize || execp->a_trsize)
    abfd->flags |= HAS_RELOC;
  /* Setting of EXEC_P has been deferred to the bottom of this function.  */
  if (execp->a_syms)
    abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS;
  if (N_DYNAMIC (execp))
    abfd->flags |= DYNAMIC;

 /* Squeezed files aren't supported (yet)!  */
  if ((execp->a_info & MF_SQUEEZED) != 0)
    {
      bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }
  else if ((execp->a_info & MF_IS_SL) != 0)
    {
      /* Nor are shared libraries.  */
      bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }
  else if (N_MAGIC (execp) == ZMAGIC)
    {
      abfd->flags |= D_PAGED | WP_TEXT;
      adata (abfd).magic = z_magic;
    }
  else if (N_MAGIC (execp) == NMAGIC)
    {
      abfd->flags |= WP_TEXT;
      adata (abfd).magic = n_magic;
    }
  else if (N_MAGIC (execp) == OMAGIC)
    adata (abfd).magic = o_magic;
  else
    /* Should have been checked with N_BADMAG before this routine
       was called.  */
    abort ();

  bfd_get_start_address (abfd) = execp->a_entry;

  obj_aout_symbols (abfd) = NULL;
  bfd_get_symcount (abfd) = execp->a_syms / sizeof (struct external_nlist);

  /* The default relocation entry size is that of traditional V7 Unix.  */
  obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;

  /* The default symbol entry size is that of traditional Unix.  */
  obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE;

  obj_aout_external_syms (abfd) = NULL;
  obj_aout_external_strings (abfd) = NULL;
  obj_aout_sym_hashes (abfd) = NULL;

  if (! NAME (aout, make_sections) (abfd))
    return NULL;

  obj_datasec (abfd)->size = execp->a_data;
  obj_bsssec (abfd)->size = execp->a_bss;

  obj_textsec (abfd)->flags =
    (execp->a_trsize != 0
     ? (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_RELOC)
     : (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS));
  obj_datasec (abfd)->flags =
    (execp->a_drsize != 0
     ? (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS | SEC_RELOC)
     : (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS));
  obj_bsssec (abfd)->flags = SEC_ALLOC;

  result = (*callback_to_real_object_p) (abfd);

#if defined(MACH) || defined(STAT_FOR_EXEC)
  /* The original heuristic doesn't work in some important cases. The
     a.out file has no information about the text start address. For
     files (like kernels) linked to non-standard addresses (ld -Ttext
     nnn) the entry point may not be between the default text start
     (obj_textsec(abfd)->vma) and (obj_textsec(abfd)->vma) + text size
     This is not just a mach issue. Many kernels are loaded at non
     standard addresses.  */
  {
    struct stat stat_buf;

    if (abfd->iostream != NULL
	&& (abfd->flags & BFD_IN_MEMORY) == 0
        && (fstat(fileno((FILE *) (abfd->iostream)), &stat_buf) == 0)
        && ((stat_buf.st_mode & 0111) != 0))
      abfd->flags |= EXEC_P;
  }
#else /* ! MACH */
  /* Now that the segment addresses have been worked out, take a better
     guess at whether the file is executable.  If the entry point
     is within the text segment, assume it is.  (This makes files
     executable even if their entry point address is 0, as long as
     their text starts at zero.)

     At some point we should probably break down and stat the file and
     declare it executable if (one of) its 'x' bits are on...  */
  if ((execp->a_entry >= obj_textsec(abfd)->vma) &&
      (execp->a_entry < obj_textsec(abfd)->vma + obj_textsec(abfd)->size))
    abfd->flags |= EXEC_P;
#endif /* MACH */
  if (result == NULL)
    {
      free (rawptr);
      abfd->tdata.aout_data = oldrawptr;
    }
  return result;
}

static const bfd_target *
MY (object_p) (bfd *abfd)
{
  struct external_exec exec_bytes;      /* Raw exec header from file.  */
  struct internal_exec exec;            /* Cleaned-up exec header.  */
  const bfd_target *target;

  if (bfd_bread ((void *) &exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, abfd)
      != EXEC_BYTES_SIZE)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }

  exec.a_info = H_GET_32 (abfd, exec_bytes.e_info);

  if (N_BADMAG (&exec))
    return NULL;

#ifdef MACHTYPE_OK
  if (!(MACHTYPE_OK (N_MACHTYPE (&exec))))
    return NULL;
#endif

  NAME (aout, swap_exec_header_in) (abfd, & exec_bytes, & exec);

  target = riscix_some_aout_object_p (abfd, & exec, MY (callback));

  return target;
}

#include "aout-target.h"