aboutsummaryrefslogtreecommitdiff
path: root/gas/config/obj-elf.c
blob: 21fd0fa22411c5d5676eaec1db264a992f0feb1c (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
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
/* ELF object file format
   Copyright (C) 1992, 93, 94, 95, 96, 97, 98, 99, 2000
   Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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 2,
   or (at your option) any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA. */

#define OBJ_HEADER "obj-elf.h"
#include "as.h"
#include "subsegs.h"
#include "obstack.h"

#ifndef ECOFF_DEBUGGING
#define ECOFF_DEBUGGING 0
#else
#define NEED_ECOFF_DEBUG
#endif

#ifdef NEED_ECOFF_DEBUG
#include "ecoff.h"
#endif

#ifdef TC_ALPHA
#include "elf/alpha.h"
#endif

#ifdef TC_MIPS
#include "elf/mips.h"
#endif

#ifdef TC_PPC
#include "elf/ppc.h"
#endif

#ifdef TC_I370
#include "elf/i370.h"
#endif

static bfd_vma elf_s_get_size PARAMS ((symbolS *));
static void elf_s_set_size PARAMS ((symbolS *, bfd_vma));
static bfd_vma elf_s_get_align PARAMS ((symbolS *));
static void elf_s_set_align PARAMS ((symbolS *, bfd_vma));
static void elf_copy_symbol_attributes PARAMS ((symbolS *, symbolS *));
static int elf_sec_sym_ok_for_reloc PARAMS ((asection *));
static void adjust_stab_sections PARAMS ((bfd *, asection *, PTR));

#ifdef NEED_ECOFF_DEBUG
static boolean elf_get_extr PARAMS ((asymbol *, EXTR *));
static void elf_set_index PARAMS ((asymbol *, bfd_size_type));
#endif

static void obj_elf_line PARAMS ((int));
void obj_elf_version PARAMS ((int));
static void obj_elf_size PARAMS ((int));
static void obj_elf_type PARAMS ((int));
static void obj_elf_ident PARAMS ((int));
static void obj_elf_weak PARAMS ((int));
static void obj_elf_local PARAMS ((int));
static void obj_elf_visibility PARAMS ((int));
static void obj_elf_symver PARAMS ((int));
static void obj_elf_vtable_inherit PARAMS ((int));
static void obj_elf_vtable_entry PARAMS ((int));
static void obj_elf_subsection PARAMS ((int));
static void obj_elf_popsection PARAMS ((int));

static const pseudo_typeS elf_pseudo_table[] =
{
  {"comm", obj_elf_common, 0},
  {"common", obj_elf_common, 1},
  {"ident", obj_elf_ident, 0},
  {"local", obj_elf_local, 0},
  {"previous", obj_elf_previous, 0},
  {"section", obj_elf_section, 0},
  {"section.s", obj_elf_section, 0},
  {"sect", obj_elf_section, 0},
  {"sect.s", obj_elf_section, 0},
  {"pushsection", obj_elf_section, 1},
  {"popsection", obj_elf_popsection, 0},
  {"size", obj_elf_size, 0},
  {"type", obj_elf_type, 0},
  {"version", obj_elf_version, 0},
  {"weak", obj_elf_weak, 0},

  /* These define symbol visibility. */
  {"internal", obj_elf_visibility, STV_INTERNAL},
  {"hidden", obj_elf_visibility, STV_HIDDEN},
  {"protected", obj_elf_visibility, STV_PROTECTED},

  /* These are used for stabs-in-elf configurations.  */
  {"line", obj_elf_line, 0},

  /* This is a GNU extension to handle symbol versions.  */
  {"symver", obj_elf_symver, 0},

  /* A GNU extension to change subsection only.  */
  {"subsection", obj_elf_subsection, 0},

  /* These are GNU extensions to aid in garbage collecting C++ vtables.  */
  {"vtable_inherit", obj_elf_vtable_inherit, 0},
  {"vtable_entry", obj_elf_vtable_entry, 0},

  /* These are used for dwarf. */
  {"2byte", cons, 2},
  {"4byte", cons, 4},
  {"8byte", cons, 8},

  /* We need to trap the section changing calls to handle .previous.  */
  {"data", obj_elf_data, 0},
  {"text", obj_elf_text, 0},

  /* End sentinel.  */
  {NULL, NULL, 0},
};

static const pseudo_typeS ecoff_debug_pseudo_table[] =
{
#ifdef NEED_ECOFF_DEBUG
  /* COFF style debugging information for ECOFF. .ln is not used; .loc
     is used instead.  */
  { "def",	ecoff_directive_def,	0 },
  { "dim",	ecoff_directive_dim,	0 },
  { "endef",	ecoff_directive_endef,	0 },
  { "file",	ecoff_directive_file,	0 },
  { "scl",	ecoff_directive_scl,	0 },
  { "tag",	ecoff_directive_tag,	0 },
  { "val",	ecoff_directive_val,	0 },

  /* COFF debugging requires pseudo-ops .size and .type, but ELF
     already has meanings for those.  We use .esize and .etype
     instead.  These are only generated by gcc anyhow.  */
  { "esize",	ecoff_directive_size,	0 },
  { "etype",	ecoff_directive_type,	0 },

  /* ECOFF specific debugging information.  */
  { "begin",	ecoff_directive_begin,	0 },
  { "bend",	ecoff_directive_bend,	0 },
  { "end",	ecoff_directive_end,	0 },
  { "ent",	ecoff_directive_ent,	0 },
  { "fmask",	ecoff_directive_fmask,	0 },
  { "frame",	ecoff_directive_frame,	0 },
  { "loc",	ecoff_directive_loc,	0 },
  { "mask",	ecoff_directive_mask,	0 },

  /* Other ECOFF directives.  */
  { "extern",	ecoff_directive_extern,	0 },

  /* These are used on Irix.  I don't know how to implement them.  */
  { "alias",	s_ignore,		0 },
  { "bgnb",	s_ignore,		0 },
  { "endb",	s_ignore,		0 },
  { "lab",	s_ignore,		0 },
  { "noalias",	s_ignore,		0 },
  { "verstamp",	s_ignore,		0 },
  { "vreg",	s_ignore,		0 },
#endif

  {NULL, NULL, 0}			/* end sentinel */
};

#undef NO_RELOC
#include "aout/aout64.h"

/* This is called when the assembler starts.  */

void
elf_begin ()
{
  /* Add symbols for the known sections to the symbol table.  */
  symbol_table_insert (section_symbol (bfd_get_section_by_name (stdoutput,
								TEXT_SECTION_NAME)));
  symbol_table_insert (section_symbol (bfd_get_section_by_name (stdoutput,
								DATA_SECTION_NAME)));
  symbol_table_insert (section_symbol (bfd_get_section_by_name (stdoutput,
								BSS_SECTION_NAME)));
}

void
elf_pop_insert ()
{
  pop_insert (elf_pseudo_table);
  if (ECOFF_DEBUGGING)
    pop_insert (ecoff_debug_pseudo_table);
}

static bfd_vma
elf_s_get_size (sym)
     symbolS *sym;
{
  return S_GET_SIZE (sym);
}

static void
elf_s_set_size (sym, sz)
     symbolS *sym;
     bfd_vma sz;
{
  S_SET_SIZE (sym, sz);
}

static bfd_vma
elf_s_get_align (sym)
     symbolS *sym;
{
  return S_GET_ALIGN (sym);
}

static void
elf_s_set_align (sym, align)
     symbolS *sym;
     bfd_vma align;
{
  S_SET_ALIGN (sym, align);
}

int
elf_s_get_other (sym)
     symbolS *sym;
{
  return elf_symbol (symbol_get_bfdsym (sym))->internal_elf_sym.st_other;
}

static void
elf_copy_symbol_attributes (dest, src)
     symbolS *dest, *src;
{
  OBJ_COPY_SYMBOL_ATTRIBUTES (dest, src);
}

static int
elf_sec_sym_ok_for_reloc (sec)
     asection *sec;
{
  return obj_sec_sym_ok_for_reloc (sec);
}

void
elf_file_symbol (s)
     char *s;
{
  symbolS *sym;

  sym = symbol_new (s, absolute_section, (valueT) 0, (struct frag *) 0);
  symbol_set_frag (sym, &zero_address_frag);
  symbol_get_bfdsym (sym)->flags |= BSF_FILE;

  if (symbol_rootP != sym)
    {
      symbol_remove (sym, &symbol_rootP, &symbol_lastP);
      symbol_insert (sym, symbol_rootP, &symbol_rootP, &symbol_lastP);
#ifdef DEBUG
      verify_symbol_chain (symbol_rootP, symbol_lastP);
#endif
    }

#ifdef NEED_ECOFF_DEBUG
  ecoff_new_file (s);
#endif
}

void
obj_elf_common (is_common)
     int is_common;
{
  char *name;
  char c;
  char *p;
  int temp, size;
  symbolS *symbolP;
  int have_align;

  if (flag_mri && is_common)
    {
      s_mri_common (0);
      return;
    }

  name = input_line_pointer;
  c = get_symbol_end ();
  /* just after name is now '\0' */
  p = input_line_pointer;
  *p = c;
  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      as_bad (_("Expected comma after symbol-name"));
      ignore_rest_of_line ();
      return;
    }
  input_line_pointer++;		/* skip ',' */
  if ((temp = get_absolute_expression ()) < 0)
    {
      as_bad (_(".COMMon length (%d.) <0! Ignored."), temp);
      ignore_rest_of_line ();
      return;
    }
  size = temp;
  *p = 0;
  symbolP = symbol_find_or_make (name);
  *p = c;
  if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP))
    {
      as_bad (_("Ignoring attempt to re-define symbol"));
      ignore_rest_of_line ();
      return;
    }
  if (S_GET_VALUE (symbolP) != 0)
    {
      if (S_GET_VALUE (symbolP) != (valueT) size)
	{
	  as_warn (_("Length of .comm \"%s\" is already %ld. Not changed to %d."),
		   S_GET_NAME (symbolP), (long) S_GET_VALUE (symbolP), size);
	}
    }
  know (symbolP->sy_frag == &zero_address_frag);
  if (*input_line_pointer != ',')
    have_align = 0;
  else
    {
      have_align = 1;
      input_line_pointer++;
      SKIP_WHITESPACE ();
    }
  if (! have_align || *input_line_pointer != '"')
    {
      if (! have_align)
	temp = 0;
      else
	{
	  temp = get_absolute_expression ();
	  if (temp < 0)
	    {
	      temp = 0;
	      as_warn (_("Common alignment negative; 0 assumed"));
	    }
	}
      if (symbol_get_obj (symbolP)->local)
	{
	  segT old_sec;
	  int old_subsec;
	  char *pfrag;
	  int align;

	/* allocate_bss: */
	  old_sec = now_seg;
	  old_subsec = now_subseg;
	  if (temp)
	    {
	      /* convert to a power of 2 alignment */
	      for (align = 0; (temp & 1) == 0; temp >>= 1, ++align);
	      if (temp != 1)
		{
		  as_bad (_("Common alignment not a power of 2"));
		  ignore_rest_of_line ();
		  return;
		}
	    }
	  else
	    align = 0;
	  record_alignment (bss_section, align);
	  subseg_set (bss_section, 0);
	  if (align)
	    frag_align (align, 0, 0);
	  if (S_GET_SEGMENT (symbolP) == bss_section)
	    symbol_get_frag (symbolP)->fr_symbol = 0;
	  symbol_set_frag (symbolP, frag_now);
	  pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP,
			    (offsetT) size, (char *) 0);
	  *pfrag = 0;
	  S_SET_SIZE (symbolP, size);
	  S_SET_SEGMENT (symbolP, bss_section);
	  S_CLEAR_EXTERNAL (symbolP);
	  subseg_set (old_sec, old_subsec);
	}
      else
	{
	allocate_common:
	  S_SET_VALUE (symbolP, (valueT) size);
	  S_SET_ALIGN (symbolP, temp);
	  S_SET_EXTERNAL (symbolP);
	  S_SET_SEGMENT (symbolP, bfd_com_section_ptr);
	}
    }
  else
    {
      input_line_pointer++;
      /* @@ Some use the dot, some don't.  Can we get some consistency??  */
      if (*input_line_pointer == '.')
	input_line_pointer++;
      /* @@ Some say data, some say bss.  */
      if (strncmp (input_line_pointer, "bss\"", 4)
	  && strncmp (input_line_pointer, "data\"", 5))
	{
	  while (*--input_line_pointer != '"')
	    ;
	  input_line_pointer--;
	  goto bad_common_segment;
	}
      while (*input_line_pointer++ != '"')
	;
      goto allocate_common;
    }

  symbol_get_bfdsym (symbolP)->flags |= BSF_OBJECT;

  demand_empty_rest_of_line ();
  return;

  {
  bad_common_segment:
    p = input_line_pointer;
    while (*p && *p != '\n')
      p++;
    c = *p;
    *p = '\0';
    as_bad (_("bad .common segment %s"), input_line_pointer + 1);
    *p = c;
    input_line_pointer = p;
    ignore_rest_of_line ();
    return;
  }
}

static void
obj_elf_local (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name;
  int c;
  symbolS *symbolP;

  do
    {
      name = input_line_pointer;
      c = get_symbol_end ();
      symbolP = symbol_find_or_make (name);
      *input_line_pointer = c;
      SKIP_WHITESPACE ();
      S_CLEAR_EXTERNAL (symbolP);
      symbol_get_obj (symbolP)->local = 1;
      if (c == ',')
	{
	  input_line_pointer++;
	  SKIP_WHITESPACE ();
	  if (*input_line_pointer == '\n')
	    c = '\n';
	}
    }
  while (c == ',');
  demand_empty_rest_of_line ();
}

static void
obj_elf_weak (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name;
  int c;
  symbolS *symbolP;

  do
    {
      name = input_line_pointer;
      c = get_symbol_end ();
      symbolP = symbol_find_or_make (name);
      *input_line_pointer = c;
      SKIP_WHITESPACE ();
      S_SET_WEAK (symbolP);
      symbol_get_obj (symbolP)->local = 1;
      if (c == ',')
	{
	  input_line_pointer++;
	  SKIP_WHITESPACE ();
	  if (*input_line_pointer == '\n')
	    c = '\n';
	}
    }
  while (c == ',');
  demand_empty_rest_of_line ();
}

static void
obj_elf_visibility (visibility)
     int visibility;
{
  char *name;
  int c;
  symbolS *symbolP;
  asymbol *bfdsym;
  elf_symbol_type *elfsym;

  do
    {
      name = input_line_pointer;
      c = get_symbol_end ();
      symbolP = symbol_find_or_make (name);
      *input_line_pointer = c;

      SKIP_WHITESPACE ();

      bfdsym = symbol_get_bfdsym (symbolP);
      elfsym = elf_symbol_from (bfd_asymbol_bfd (bfdsym), bfdsym);

      assert (elfsym);

      elfsym->internal_elf_sym.st_other = visibility;

      if (c == ',')
	{
	  input_line_pointer ++;

	  SKIP_WHITESPACE ();

	  if (*input_line_pointer == '\n')
	    c = '\n';
	}
    }
  while (c == ',');

  demand_empty_rest_of_line ();
}


static segT previous_section;
static int previous_subsection;

struct section_stack
{
  struct section_stack *next;
  segT seg, prev_seg;
  int subseg, prev_subseg;
};

static struct section_stack *section_stack;


/* Handle the .section pseudo-op.  This code supports two different
   syntaxes.

   The first is found on Solaris, and looks like
       .section ".sec1",#alloc,#execinstr,#write
   Here the names after '#' are the SHF_* flags to turn on for the
   section.  I'm not sure how it determines the SHT_* type (BFD
   doesn't really give us control over the type, anyhow).

   The second format is found on UnixWare, and probably most SVR4
   machines, and looks like
       .section .sec1,"a",@progbits
   The quoted string may contain any combination of a, w, x, and
   represents the SHF_* flags to turn on for the section.  The string
   beginning with '@' can be progbits or nobits.  There should be
   other possibilities, but I don't know what they are.  In any case,
   BFD doesn't really let us set the section type.  */

/* Certain named sections have particular defined types, listed on p.
   4-19 of the ABI.  */
struct special_section
{
  const char *name;
  int type;
  int attributes;
};

static struct special_section const special_sections[] =
{
  { ".bss",	SHT_NOBITS,	SHF_ALLOC + SHF_WRITE		},
  { ".comment",	SHT_PROGBITS,	0				},
  { ".data",	SHT_PROGBITS,	SHF_ALLOC + SHF_WRITE		},
  { ".data1",	SHT_PROGBITS,	SHF_ALLOC + SHF_WRITE		},
  { ".debug",	SHT_PROGBITS,	0				},
  { ".fini",	SHT_PROGBITS,	SHF_ALLOC + SHF_EXECINSTR	},
  { ".init",	SHT_PROGBITS,	SHF_ALLOC + SHF_EXECINSTR	},
  { ".line",	SHT_PROGBITS,	0				},
  { ".note",	SHT_NOTE,	0				},
  { ".rodata",	SHT_PROGBITS,	SHF_ALLOC			},
  { ".rodata1",	SHT_PROGBITS,	SHF_ALLOC			},
  { ".text",	SHT_PROGBITS,	SHF_ALLOC + SHF_EXECINSTR	},

#ifdef ELF_TC_SPECIAL_SECTIONS
  ELF_TC_SPECIAL_SECTIONS
#endif

#if 0
  /* The following section names are special, but they can not
     reasonably appear in assembler code.  Some of the attributes are
     processor dependent.  */
  { ".dynamic",	SHT_DYNAMIC,	SHF_ALLOC /* + SHF_WRITE */ 	},
  { ".dynstr",	SHT_STRTAB,	SHF_ALLOC			},
  { ".dynsym",	SHT_DYNSYM,	SHF_ALLOC			},
  { ".got",	SHT_PROGBITS,	0				},
  { ".hash",	SHT_HASH,	SHF_ALLOC			},
  { ".interp",	SHT_PROGBITS,	/* SHF_ALLOC */			},
  { ".plt",	SHT_PROGBITS,	0				},
  { ".shstrtab",SHT_STRTAB,	0				},
  { ".strtab",	SHT_STRTAB,	/* SHF_ALLOC */			},
  { ".symtab",	SHT_SYMTAB,	/* SHF_ALLOC */			},
#endif

  { NULL,	0,		0				}
};

void
obj_elf_change_section (name, type, attr, push)
     char *name;
     int type, attr, push;
{
  int new_sec;
  segT sec;

#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  /* Switch to the section, creating it if necessary.  */
  if (push)
    {
      struct section_stack *elt;
      elt = xmalloc (sizeof (struct section_stack));
      elt->next = section_stack;
      elt->seg = now_seg;
      elt->prev_seg = previous_section;
      elt->subseg = now_subseg;
      elt->prev_subseg = previous_subsection;
      section_stack = elt;
    }
  previous_section = now_seg;
  previous_subsection = now_subseg;

  new_sec = bfd_get_section_by_name (stdoutput, name) == NULL;
  sec = subseg_new (name, 0);

  if (new_sec)
    {
      flagword flags;
      symbolS *secsym;
      int i;

      /* See if this is one of the special sections.  */
      for (i = 0; special_sections[i].name != NULL; i++)
        if (strcmp (name, special_sections[i].name) == 0)
          {
	    if (type == SHT_NULL)
	      type = special_sections[i].type;
	    else if (type != special_sections[i].type)
	      as_warn (_("Setting incorrect section type for %s"), name);

	    if ((attr &~ special_sections[i].attributes) != 0)
	      {
	        /* As a GNU extension, we permit a .note section to be
		   allocatable.  If the linker sees an allocateable .note
		   section, it will create a PT_NOTE segment in the output
		   file.  */
		if (strcmp (name, ".note") != 0
		    || attr != SHF_ALLOC)
		  as_warn (_("Setting incorrect section attributes for %s"),
			   name);
	      }
	    attr |= special_sections[i].attributes;
	    break;
	  }

      /* Convert ELF type and flags to BFD flags.  */
      flags = (SEC_RELOC
	       | ((attr & SHF_WRITE) ? 0 : SEC_READONLY)
	       | ((attr & SHF_ALLOC) ? SEC_ALLOC : 0)
	       | (((attr & SHF_ALLOC) && type != SHT_NOBITS) ? SEC_LOAD : 0)
	       | ((attr & SHF_EXECINSTR) ? SEC_CODE : 0));
#ifdef md_elf_section_flags
      flags = md_elf_section_flags (flags, attr, type);
#endif

      /* Prevent SEC_HAS_CONTENTS from being inadvertently set.  */
      if (type == SHT_NOBITS)
        seg_info (sec)->bss = 1;

      bfd_set_section_flags (stdoutput, sec, flags);

      /* Add a symbol for this section to the symbol table.  */
      secsym = symbol_find (name);
      if (secsym != NULL)
	symbol_set_bfdsym (secsym, sec->symbol);
      else
        symbol_table_insert (section_symbol (sec));
    }

#ifdef md_elf_section_change_hook
      md_elf_section_change_hook ();
#endif
}

int
obj_elf_parse_section_letters (str, len)
     char *str;
     size_t len;
{
  int attr = 0;

  while (len > 0)
    {
      switch (*str)
	{
	case 'a':
	  attr |= SHF_ALLOC;
	  break;
	case 'w':
	  attr |= SHF_WRITE;
	  break;
	case 'x':
	  attr |= SHF_EXECINSTR;
	  break;
	default:
	  {
	    char *bad_msg = _("Unrecognized .section attribute: want a,w,x");
#ifdef md_elf_section_letter
	    int md_attr = md_elf_section_letter (*str, &bad_msg);
	    if (md_attr >= 0)
	      attr |= md_attr;
	    else
#endif
	      {
		as_warn ("%s", bad_msg);
		attr = -1;
	      }
	  }
	  break;
	}
      str++, len--;
    }

  return attr;
}

int
obj_elf_section_word (str, len)
     char *str;
     size_t len;
{
  if (len == 5 && strncmp (str, "write", 5) == 0)
    return SHF_WRITE;
  if (len == 5 && strncmp (str, "alloc", 5) == 0)
    return SHF_ALLOC;
  if (len == 9 && strncmp (str, "execinstr", 9) == 0)
    return SHF_EXECINSTR;

#ifdef md_elf_section_word
  {
    int md_attr = md_elf_section_word (str, len);
    if (md_attr >= 0)
      return md_attr;
  }
#endif

  as_warn (_("Unrecognized section attribute"));
  return 0;
}

int
obj_elf_section_type (str, len)
     char *str;
     size_t len;
{
  if (len == 8 && strncmp (str, "progbits", 8) == 0)
    return SHT_PROGBITS;
  if (len == 6 && strncmp (str, "nobits", 6) == 0)
    return SHT_NOBITS;

#ifdef md_elf_section_type
  {
    int md_type = md_elf_section_type (str, len);
    if (md_type >= 0)
      return md_type;
  }
#endif

  as_warn (_("Unrecognized section type"));
  return 0;
}

void
obj_elf_section (push)
     int push;
{
  char *name, *beg, *end;
  int type, attr, dummy;

#ifndef TC_I370
  if (flag_mri)
    {
      char mri_type;

#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

      previous_section = now_seg;
      previous_subsection = now_subseg;

      s_mri_sect (&mri_type);

#ifdef md_elf_section_change_hook
      md_elf_section_change_hook ();
#endif

      return;
    }
#endif /* ! defined (TC_I370) */

  /* Get name of section.  */
  SKIP_WHITESPACE ();
  if (*input_line_pointer == '"')
    {
      name = demand_copy_C_string (&dummy);
      if (name == NULL)
	{
	  ignore_rest_of_line ();
	  return;
	}
    }
  else
    {
      end = input_line_pointer;
      while (0 == strchr ("\n\t,; ", *end))
	end++;
      if (end == input_line_pointer)
	{
	  as_warn (_("Missing section name"));
	  ignore_rest_of_line ();
	  return;
	}

      name = xmalloc (end - input_line_pointer + 1);
      memcpy (name, input_line_pointer, end - input_line_pointer);
      name[end - input_line_pointer] = '\0';
      input_line_pointer = end;
    }
  SKIP_WHITESPACE ();

  type = SHT_NULL;
  attr = 0;

  if (*input_line_pointer == ',')
    {
      /* Skip the comma.  */
      ++input_line_pointer;
      SKIP_WHITESPACE ();

      if (*input_line_pointer == '"')
	{
	  beg = demand_copy_C_string (&dummy);
	  if (beg == NULL)
	    {
	      ignore_rest_of_line ();
	      return;
	    }
	  attr |= obj_elf_parse_section_letters (beg, strlen (beg));

	  SKIP_WHITESPACE ();
	  if (*input_line_pointer == ',')
	    {
	      char c;
	      ++input_line_pointer;
	      SKIP_WHITESPACE ();
	      c = *input_line_pointer;
	      if (c == '"')
		{
		  beg = demand_copy_C_string (&dummy);
		  if (beg == NULL)
		    {
		      ignore_rest_of_line ();
		      return;
		    }
		  type = obj_elf_section_type (beg, strlen (beg));
		}
	      else if (c == '@' || c == '%')
		{
		  beg = ++input_line_pointer;
		  c = get_symbol_end ();
		  *input_line_pointer = c;
		  type = obj_elf_section_type (beg, input_line_pointer - beg);
		}
	    }
	}
      else
	{
	  do
	    {
	      char c;

	      SKIP_WHITESPACE ();
	      if (*input_line_pointer != '#')
		{
		  as_warn (_("Bad .section directive - character following name is not '#'"));
		  ignore_rest_of_line ();
		  return;
		}
	      beg = ++input_line_pointer;
	      c = get_symbol_end ();
	      *input_line_pointer = c;

	      attr |= obj_elf_section_word (beg, input_line_pointer - beg);

	      SKIP_WHITESPACE ();
	    }
	  while (*input_line_pointer++ == ',');
	  --input_line_pointer;
	}
    }

  demand_empty_rest_of_line ();

  obj_elf_change_section (name, type, attr, push);
}

/* Change to the .data section.  */

void
obj_elf_data (i)
     int i;
{
#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  previous_section = now_seg;
  previous_subsection = now_subseg;
  s_data (i);

#ifdef md_elf_section_change_hook
  md_elf_section_change_hook ();
#endif
}

/* Change to the .text section.  */

void
obj_elf_text (i)
     int i;
{
#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  previous_section = now_seg;
  previous_subsection = now_subseg;
  s_text (i);

#ifdef md_elf_section_change_hook
  md_elf_section_change_hook ();
#endif
}

static void
obj_elf_subsection (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  register int temp;

#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  previous_section = now_seg;
  previous_subsection = now_subseg;

  temp = get_absolute_expression ();
  subseg_set (now_seg, (subsegT) temp);
  demand_empty_rest_of_line ();

#ifdef md_elf_section_change_hook
  md_elf_section_change_hook ();
#endif
}

/* This can be called from the processor backends if they change
   sections.  */

void
obj_elf_section_change_hook ()
{
  previous_section = now_seg;
  previous_subsection = now_subseg;
}

void
obj_elf_previous (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  segT new_section;
  int new_subsection;

  if (previous_section == 0)
    {
      as_bad (_(".previous without corresponding .section; ignored"));
      return;
    }

#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  new_section = previous_section;
  new_subsection = previous_subsection;
  previous_section = now_seg;
  previous_subsection = now_subseg;
  subseg_set (new_section, new_subsection);

#ifdef md_elf_section_change_hook
  md_elf_section_change_hook ();
#endif
}

static void
obj_elf_popsection (xxx)
     int xxx ATTRIBUTE_UNUSED;
{
  struct section_stack *top = section_stack;

  if (top == NULL)
    {
      as_bad (_(".popsection without corresponding .pushsection; ignored"));
      return;
    }

#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  section_stack = top->next;
  previous_section = top->prev_seg;
  previous_subsection = top->prev_subseg;
  subseg_set (top->seg, top->subseg);
  free (top);

#ifdef md_elf_section_change_hook
  md_elf_section_change_hook ();
#endif
}

static void
obj_elf_line (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  /* Assume delimiter is part of expression.  BSD4.2 as fails with
     delightful bug, so we are not being incompatible here. */
  new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
  demand_empty_rest_of_line ();
}

/* This handles the .symver pseudo-op, which is used to specify a
   symbol version.  The syntax is ``.symver NAME,SYMVERNAME''.
   SYMVERNAME may contain ELF_VER_CHR ('@') characters.  This
   pseudo-op causes the assembler to emit a symbol named SYMVERNAME
   with the same value as the symbol NAME.  */

static void
obj_elf_symver (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name;
  char c;
  symbolS *sym;

  name = input_line_pointer;
  c = get_symbol_end ();

  sym = symbol_find_or_make (name);

  *input_line_pointer = c;

  if (symbol_get_obj (sym)->versioned_name != NULL)
    {
      as_bad (_("multiple .symver directives for symbol `%s'"),
	      S_GET_NAME (sym));
      ignore_rest_of_line ();
      return;
    }

  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      as_bad (_("expected comma after name in .symver"));
      ignore_rest_of_line ();
      return;
    }

  ++input_line_pointer;
  name = input_line_pointer;
  while (1)
    {
      c = get_symbol_end ();
      if (c != ELF_VER_CHR)
	break;
      *input_line_pointer++ = c;
    }

  symbol_get_obj (sym)->versioned_name = xstrdup (name);

  *input_line_pointer = c;

  if (strchr (symbol_get_obj (sym)->versioned_name, ELF_VER_CHR) == NULL)
    {
      as_bad (_("missing version name in `%s' for symbol `%s'"),
	      symbol_get_obj (sym)->versioned_name, S_GET_NAME (sym));
      ignore_rest_of_line ();
      return;
    }

  demand_empty_rest_of_line ();
}

/* This handles the .vtable_inherit pseudo-op, which is used to indicate
   to the linker the hierarchy in which a particular table resides.  The
   syntax is ".vtable_inherit CHILDNAME, PARENTNAME".  */

static void
obj_elf_vtable_inherit (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *cname, *pname;
  symbolS *csym, *psym;
  char c, bad = 0;

  if (*input_line_pointer == '#')
    ++input_line_pointer;

  cname = input_line_pointer;
  c = get_symbol_end ();
  csym = symbol_find (cname);

  /* GCFIXME: should check that we don't have two .vtable_inherits for
     the same child symbol.  Also, we can currently only do this if the
     child symbol is already exists and is placed in a fragment.  */

  if (csym == NULL || symbol_get_frag (csym) == NULL)
    {
      as_bad ("expected `%s' to have already been set for .vtable_inherit",
	      cname);
      bad = 1;
    }

  *input_line_pointer = c;

  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      as_bad ("expected comma after name in .vtable_inherit");
      ignore_rest_of_line ();
      return;
    }

  ++input_line_pointer;
  SKIP_WHITESPACE ();

  if (*input_line_pointer == '#')
    ++input_line_pointer;

  if (input_line_pointer[0] == '0'
      && (input_line_pointer[1] == '\0'
	  || isspace ((unsigned char) input_line_pointer[1])))
    {
      psym = section_symbol (absolute_section);
      ++input_line_pointer;
    }
  else
    {
      pname = input_line_pointer;
      c = get_symbol_end ();
      psym = symbol_find_or_make (pname);
      *input_line_pointer = c;
    }

  demand_empty_rest_of_line ();

  if (bad)
    return;

  assert (symbol_get_value_expression (csym)->X_op == O_constant);
  fix_new (symbol_get_frag (csym),
	   symbol_get_value_expression (csym)->X_add_number, 0, psym, 0, 0,
	   BFD_RELOC_VTABLE_INHERIT);
}

/* This handles the .vtable_entry pseudo-op, which is used to indicate
   to the linker that a vtable slot was used.  The syntax is
   ".vtable_entry tablename, offset".  */

static void
obj_elf_vtable_entry (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name;
  symbolS *sym;
  offsetT offset;
  char c;

  if (*input_line_pointer == '#')
    ++input_line_pointer;

  name = input_line_pointer;
  c = get_symbol_end ();
  sym = symbol_find_or_make (name);
  *input_line_pointer = c;

  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      as_bad ("expected comma after name in .vtable_entry");
      ignore_rest_of_line ();
      return;
    }

  ++input_line_pointer;
  if (*input_line_pointer == '#')
    ++input_line_pointer;

  offset = get_absolute_expression ();

  fix_new (frag_now, frag_now_fix (), 0, sym, offset, 0,
	   BFD_RELOC_VTABLE_ENTRY);

  demand_empty_rest_of_line ();
}

void
elf_obj_read_begin_hook ()
{
#ifdef NEED_ECOFF_DEBUG
  if (ECOFF_DEBUGGING)
    ecoff_read_begin_hook ();
#endif
}

void
elf_obj_symbol_new_hook (symbolP)
     symbolS *symbolP;
{
  struct elf_obj_sy *sy_obj;

  sy_obj = symbol_get_obj (symbolP);
  sy_obj->size = NULL;
  sy_obj->versioned_name = NULL;

#ifdef NEED_ECOFF_DEBUG
  if (ECOFF_DEBUGGING)
    ecoff_symbol_new_hook (symbolP);
#endif
}

void
obj_elf_version (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name;
  unsigned int c;
  char ch;
  char *p;
  asection *seg = now_seg;
  subsegT subseg = now_subseg;
  Elf_Internal_Note i_note;
  Elf_External_Note e_note;
  asection *note_secp = (asection *) NULL;
  int i, len;

  SKIP_WHITESPACE ();
  if (*input_line_pointer == '\"')
    {
      ++input_line_pointer;	/* -> 1st char of string. */
      name = input_line_pointer;

      while (is_a_char (c = next_char_of_string ()))
	;
      c = *input_line_pointer;
      *input_line_pointer = '\0';
      *(input_line_pointer - 1) = '\0';
      *input_line_pointer = c;

      /* create the .note section */

      note_secp = subseg_new (".note", 0);
      bfd_set_section_flags (stdoutput,
			     note_secp,
			     SEC_HAS_CONTENTS | SEC_READONLY);

      /* process the version string */

      len = strlen (name);

      i_note.namesz = ((len + 1) + 3) & ~3; /* round this to word boundary */
      i_note.descsz = 0;	/* no description */
      i_note.type = NT_VERSION;
      p = frag_more (sizeof (e_note.namesz));
      md_number_to_chars (p, (valueT) i_note.namesz, 4);
      p = frag_more (sizeof (e_note.descsz));
      md_number_to_chars (p, (valueT) i_note.descsz, 4);
      p = frag_more (sizeof (e_note.type));
      md_number_to_chars (p, (valueT) i_note.type, 4);

      for (i = 0; i < len; i++)
	{
	  ch = *(name + i);
	  {
	    FRAG_APPEND_1_CHAR (ch);
	  }
	}
      frag_align (2, 0, 0);

      subseg_set (seg, subseg);
    }
  else
    {
      as_bad (_("Expected quoted string"));
    }
  demand_empty_rest_of_line ();
}

static void
obj_elf_size (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name = input_line_pointer;
  char c = get_symbol_end ();
  char *p;
  expressionS exp;
  symbolS *sym;

  p = input_line_pointer;
  *p = c;
  SKIP_WHITESPACE ();
  if (*input_line_pointer != ',')
    {
      *p = 0;
      as_bad (_("expected comma after name `%s' in .size directive"), name);
      *p = c;
      ignore_rest_of_line ();
      return;
    }
  input_line_pointer++;
  expression (&exp);
  if (exp.X_op == O_absent)
    {
      as_bad (_("missing expression in .size directive"));
      exp.X_op = O_constant;
      exp.X_add_number = 0;
    }
  *p = 0;
  sym = symbol_find_or_make (name);
  *p = c;
  if (exp.X_op == O_constant)
    S_SET_SIZE (sym, exp.X_add_number);
  else
    {
      symbol_get_obj (sym)->size =
	(expressionS *) xmalloc (sizeof (expressionS));
      *symbol_get_obj (sym)->size = exp;
    }
  demand_empty_rest_of_line ();
}

/* Handle the ELF .type pseudo-op.  This sets the type of a symbol.
   There are four syntaxes:

   The first (used on Solaris) is
       .type SYM,#function
   The second (used on UnixWare) is
       .type SYM,@function
   The third (reportedly to be used on Irix 6.0) is
       .type SYM STT_FUNC
   The fourth (used on NetBSD/Arm and Linux/ARM) is
       .type SYM,%function
   */

static void
obj_elf_type (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  char *name;
  char c;
  int type;
  const char *typename;
  symbolS *sym;

  name = input_line_pointer;
  c = get_symbol_end ();
  sym = symbol_find_or_make (name);
  *input_line_pointer = c;

  SKIP_WHITESPACE ();
  if (*input_line_pointer == ',')
    ++input_line_pointer;

  SKIP_WHITESPACE ();
  if (   *input_line_pointer == '#'
      || *input_line_pointer == '@'
      || *input_line_pointer == '%')
    ++input_line_pointer;

  typename = input_line_pointer;
  c = get_symbol_end ();

  type = 0;
  if (strcmp (typename, "function") == 0
      || strcmp (typename, "STT_FUNC") == 0)
    type = BSF_FUNCTION;
  else if (strcmp (typename, "object") == 0
	   || strcmp (typename, "STT_OBJECT") == 0)
    type = BSF_OBJECT;
  else
    as_bad (_("ignoring unrecognized symbol type \"%s\""), typename);

  *input_line_pointer = c;

  symbol_get_bfdsym (sym)->flags |= type;

  demand_empty_rest_of_line ();
}

static void
obj_elf_ident (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  static segT comment_section;
  segT old_section = now_seg;
  int old_subsection = now_subseg;

#ifdef md_flush_pending_output
  md_flush_pending_output ();
#endif

  if (!comment_section)
    {
      char *p;
      comment_section = subseg_new (".comment", 0);
      bfd_set_section_flags (stdoutput, comment_section,
			     SEC_READONLY | SEC_HAS_CONTENTS);
      p = frag_more (1);
      *p = 0;
    }
  else
    subseg_set (comment_section, 0);
  stringer (1);
  subseg_set (old_section, old_subsection);
}

#ifdef INIT_STAB_SECTION

/* The first entry in a .stabs section is special.  */

void
obj_elf_init_stab_section (seg)
     segT seg;
{
  char *file;
  char *p;
  char *stabstr_name;
  unsigned int stroff;

  /* Force the section to align to a longword boundary.  Without this,
     UnixWare ar crashes.  */
  bfd_set_section_alignment (stdoutput, seg, 2);

  /* Make space for this first symbol. */
  p = frag_more (12);
  /* Zero it out. */
  memset (p, 0, 12);
  as_where (&file, (unsigned int *) NULL);
  stabstr_name = (char *) alloca (strlen (segment_name (seg)) + 4);
  strcpy (stabstr_name, segment_name (seg));
  strcat (stabstr_name, "str");
  stroff = get_stab_string_offset (file, stabstr_name);
  know (stroff == 1);
  md_number_to_chars (p, stroff, 4);
  seg_info (seg)->stabu.p = p;
}

#endif

/* Fill in the counts in the first entry in a .stabs section.  */

static void
adjust_stab_sections (abfd, sec, xxx)
     bfd *abfd;
     asection *sec;
     PTR xxx ATTRIBUTE_UNUSED;
{
  char *name;
  asection *strsec;
  char *p;
  int strsz, nsyms;

  if (strncmp (".stab", sec->name, 5))
    return;
  if (!strcmp ("str", sec->name + strlen (sec->name) - 3))
    return;

  name = (char *) alloca (strlen (sec->name) + 4);
  strcpy (name, sec->name);
  strcat (name, "str");
  strsec = bfd_get_section_by_name (abfd, name);
  if (strsec)
    strsz = bfd_section_size (abfd, strsec);
  else
    strsz = 0;
  nsyms = bfd_section_size (abfd, sec) / 12 - 1;

  p = seg_info (sec)->stabu.p;
  assert (p != 0);

  bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6);
  bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8);
}

#ifdef NEED_ECOFF_DEBUG

/* This function is called by the ECOFF code.  It is supposed to
   record the external symbol information so that the backend can
   write it out correctly.  The ELF backend doesn't actually handle
   this at the moment, so we do it ourselves.  We save the information
   in the symbol.  */

void
elf_ecoff_set_ext (sym, ext)
     symbolS *sym;
     struct ecoff_extr *ext;
{
  symbol_get_bfdsym (sym)->udata.p = (PTR) ext;
}

/* This function is called by bfd_ecoff_debug_externals.  It is
   supposed to *EXT to the external symbol information, and return
   whether the symbol should be used at all.  */

static boolean
elf_get_extr (sym, ext)
     asymbol *sym;
     EXTR *ext;
{
  if (sym->udata.p == NULL)
    return false;
  *ext = *(EXTR *) sym->udata.p;
  return true;
}

/* This function is called by bfd_ecoff_debug_externals.  It has
   nothing to do for ELF.  */

/*ARGSUSED*/
static void
elf_set_index (sym, indx)
     asymbol *sym ATTRIBUTE_UNUSED;
     bfd_size_type indx ATTRIBUTE_UNUSED;
{
}

#endif /* NEED_ECOFF_DEBUG */

void
elf_frob_symbol (symp, puntp)
     symbolS *symp;
     int *puntp;
{
  struct elf_obj_sy *sy_obj;

#ifdef NEED_ECOFF_DEBUG
  if (ECOFF_DEBUGGING)
    ecoff_frob_symbol (symp);
#endif

  sy_obj = symbol_get_obj (symp);

  if (sy_obj->size != NULL)
    {
      switch (sy_obj->size->X_op)
	{
	case O_subtract:
	  S_SET_SIZE (symp,
		      (S_GET_VALUE (sy_obj->size->X_add_symbol)
		       + sy_obj->size->X_add_number
		       - S_GET_VALUE (sy_obj->size->X_op_symbol)));
	  break;
	case O_constant:
	  S_SET_SIZE (symp,
		      (S_GET_VALUE (sy_obj->size->X_add_symbol)
		       + sy_obj->size->X_add_number));
	  break;
	default:
	  as_bad (_(".size expression too complicated to fix up"));
	  break;
	}
      free (sy_obj->size);
      sy_obj->size = NULL;
    }

  if (sy_obj->versioned_name != NULL)
    {
      /* This symbol was given a new name with the .symver directive.

         If this is an external reference, just rename the symbol to
         include the version string.  This will make the relocs be
         against the correct versioned symbol.

	 If this is a definition, add an alias.  FIXME: Using an alias
	 will permit the debugging information to refer to the right
	 symbol.  However, it's not clear whether it is the best
	 approach.  */

      if (! S_IS_DEFINED (symp))
	{
	  char *p;

	  /* Verify that the name isn't using the @@ syntax--this is
             reserved for definitions of the default version to link
             against.  */
	  p = strchr (sy_obj->versioned_name, ELF_VER_CHR);
	  know (p != NULL);
	  if (p[1] == ELF_VER_CHR)
	    {
	      as_bad (_("invalid attempt to declare external version name as default in symbol `%s'"),
		      sy_obj->versioned_name);
	      *puntp = true;
	    }
	  S_SET_NAME (symp, sy_obj->versioned_name);
	}
      else
	{
	  symbolS *symp2;

	  /* FIXME: Creating a new symbol here is risky.  We're in the
             final loop over the symbol table.  We can get away with
             it only because the symbol goes to the end of the list,
             where the loop will still see it.  It would probably be
             better to do this in obj_frob_file_before_adjust. */

	  symp2 = symbol_find_or_make (sy_obj->versioned_name);

	  /* Now we act as though we saw symp2 = sym.  */

	  S_SET_SEGMENT (symp2, S_GET_SEGMENT (symp));

	  /* Subtracting out the frag address here is a hack because
             we are in the middle of the final loop.  */
	  S_SET_VALUE (symp2,
		       (S_GET_VALUE (symp)
			- symbol_get_frag (symp)->fr_address));

	  symbol_set_frag (symp2, symbol_get_frag (symp));

	  /* This will copy over the size information.  */
	  copy_symbol_attributes (symp2, symp);

	  if (S_IS_WEAK (symp))
	    S_SET_WEAK (symp2);

	  if (S_IS_EXTERNAL (symp))
	    S_SET_EXTERNAL (symp2);
	}
    }

  /* Double check weak symbols.  */
  if (S_IS_WEAK (symp))
    {
      if (S_IS_COMMON (symp))
	as_bad (_("Symbol `%s' can not be both weak and common"),
		S_GET_NAME (symp));
    }

#ifdef TC_MIPS
  /* The Irix 5 and 6 assemblers set the type of any common symbol and
     any undefined non-function symbol to STT_OBJECT.  We try to be
     compatible, since newer Irix 5 and 6 linkers care.  However, we
     only set undefined symbols to be STT_OBJECT if we are on Irix,
     because that is the only time gcc will generate the necessary
     .global directives to mark functions.  */

  if (S_IS_COMMON (symp))
    symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;

  if (strstr (TARGET_OS, "irix") != NULL
      && ! S_IS_DEFINED (symp)
      && (symbol_get_bfdsym (symp)->flags & BSF_FUNCTION) == 0)
    symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;
#endif

#if 0 /* TC_PPC */
  /* If TC_PPC is defined, we used to force the type of a symbol to be
     BSF_OBJECT if it was otherwise unset.  This was required by some
     version of VxWorks.  Thomas de Lellis <tdel@windriver.com> says
     that this is no longer needed, so it is now commented out.  */
  if ((symbol_get_bfdsym (symp)->flags
       & (BSF_FUNCTION | BSF_FILE | BSF_SECTION_SYM)) == 0
      && S_IS_DEFINED (symp))
    symbol_get_bfdsym (symp)->flags |= BSF_OBJECT;
#endif
}

void
elf_frob_file ()
{
  bfd_map_over_sections (stdoutput, adjust_stab_sections, (PTR) 0);

#ifdef elf_tc_final_processing
  elf_tc_final_processing ();
#endif
}

/* It is required that we let write_relocs have the opportunity to
   optimize away fixups before output has begun, since it is possible
   to eliminate all fixups for a section and thus we never should
   have generated the relocation section.  */

void
elf_frob_file_after_relocs ()
{
#ifdef NEED_ECOFF_DEBUG
  if (ECOFF_DEBUGGING)
    /* Generate the ECOFF debugging information.  */
    {
      const struct ecoff_debug_swap *debug_swap;
      struct ecoff_debug_info debug;
      char *buf;
      asection *sec;

      debug_swap
	= get_elf_backend_data (stdoutput)->elf_backend_ecoff_debug_swap;
      know (debug_swap != (const struct ecoff_debug_swap *) NULL);
      ecoff_build_debug (&debug.symbolic_header, &buf, debug_swap);

      /* Set up the pointers in debug.  */
#define SET(ptr, offset, type) \
    debug.ptr = (type) (buf + debug.symbolic_header.offset)

      SET (line, cbLineOffset, unsigned char *);
      SET (external_dnr, cbDnOffset, PTR);
      SET (external_pdr, cbPdOffset, PTR);
      SET (external_sym, cbSymOffset, PTR);
      SET (external_opt, cbOptOffset, PTR);
      SET (external_aux, cbAuxOffset, union aux_ext *);
      SET (ss, cbSsOffset, char *);
      SET (external_fdr, cbFdOffset, PTR);
      SET (external_rfd, cbRfdOffset, PTR);
      /* ssext and external_ext are set up just below.  */

#undef SET

      /* Set up the external symbols.  */
      debug.ssext = debug.ssext_end = NULL;
      debug.external_ext = debug.external_ext_end = NULL;
      if (! bfd_ecoff_debug_externals (stdoutput, &debug, debug_swap, true,
				       elf_get_extr, elf_set_index))
	as_fatal (_("Failed to set up debugging information: %s"),
		  bfd_errmsg (bfd_get_error ()));

      sec = bfd_get_section_by_name (stdoutput, ".mdebug");
      assert (sec != NULL);

      know (stdoutput->output_has_begun == false);

      /* We set the size of the section, call bfd_set_section_contents
	 to force the ELF backend to allocate a file position, and then
	 write out the data.  FIXME: Is this really the best way to do
	 this?  */
      sec->_raw_size = bfd_ecoff_debug_size (stdoutput, &debug, debug_swap);

      /* Pass BUF to bfd_set_section_contents because this will
         eventually become a call to fwrite, and ISO C prohibits
         passing a NULL pointer to a stdio function even if the
         pointer will not be used.  */
      if (! bfd_set_section_contents (stdoutput, sec, (PTR) buf,
				      (file_ptr) 0, (bfd_size_type) 0))
	as_fatal (_("Can't start writing .mdebug section: %s"),
		  bfd_errmsg (bfd_get_error ()));

      know (stdoutput->output_has_begun == true);
      know (sec->filepos != 0);

      if (! bfd_ecoff_write_debug (stdoutput, &debug, debug_swap,
				   sec->filepos))
	as_fatal (_("Could not write .mdebug section: %s"),
		  bfd_errmsg (bfd_get_error ()));
    }
#endif /* NEED_ECOFF_DEBUG */
}

#ifdef SCO_ELF

/* Heavily plagarized from obj_elf_version.  The idea is to emit the
   SCO specific identifier in the .notes section to satisfy the SCO
   linker.

   This looks more complicated than it really is.  As opposed to the
   "obvious" solution, this should handle the cross dev cases
   correctly.  (i.e, hosting on a 64 bit big endian processor, but
   generating SCO Elf code) Efficiency isn't a concern, as there
   should be exactly one of these sections per object module.

   SCO OpenServer 5 identifies it's ELF modules with a standard ELF
   .note section.

   int_32 namesz  = 4 ;  Name size
   int_32 descsz  = 12 ; Descriptive information
   int_32 type    = 1 ;
   char   name[4] = "SCO" ; Originator name ALWAYS SCO + NULL
   int_32 version = (major ver # << 16)  | version of tools ;
   int_32 source  = (tool_id << 16 ) | 1 ;
   int_32 info    = 0 ;    These are set by the SCO tools, but we
                           don't know enough about the source
			   environment to set them.  SCO ld currently
			   ignores them, and recommends we set them
			   to zero.  */

#define SCO_MAJOR_VERSION 0x1
#define SCO_MINOR_VERSION 0x1

void
sco_id ()
{

  char *name;
  unsigned int c;
  char ch;
  char *p;
  asection *seg = now_seg;
  subsegT subseg = now_subseg;
  Elf_Internal_Note i_note;
  Elf_External_Note e_note;
  asection *note_secp = (asection *) NULL;
  int i, len;

  /* create the .note section */

  note_secp = subseg_new (".note", 0);
  bfd_set_section_flags (stdoutput,
			 note_secp,
			 SEC_HAS_CONTENTS | SEC_READONLY);

  /* process the version string */

  i_note.namesz = 4;
  i_note.descsz = 12;		/* 12 descriptive bytes */
  i_note.type = NT_VERSION;	/* Contains a version string */

  p = frag_more (sizeof (i_note.namesz));
  md_number_to_chars (p, (valueT) i_note.namesz, 4);

  p = frag_more (sizeof (i_note.descsz));
  md_number_to_chars (p, (valueT) i_note.descsz, 4);

  p = frag_more (sizeof (i_note.type));
  md_number_to_chars (p, (valueT) i_note.type, 4);

  p = frag_more (4);
  strcpy (p, "SCO");

  /* Note: this is the version number of the ELF we're representing */
  p = frag_more (4);
  md_number_to_chars (p, (SCO_MAJOR_VERSION << 16) | (SCO_MINOR_VERSION), 4);

  /* Here, we pick a magic number for ourselves (yes, I "registered"
     it with SCO.  The bottom bit shows that we are compat with the
     SCO ABI.  */
  p = frag_more (4);
  md_number_to_chars (p, 0x4c520000 | 0x0001, 4);

  /* If we knew (or cared) what the source language options were, we'd
     fill them in here.  SCO has given us permission to ignore these
     and just set them to zero.  */
  p = frag_more (4);
  md_number_to_chars (p, 0x0000, 4);

  frag_align (2, 0, 0);

  /* We probably can't restore the current segment, for there likely
     isn't one yet...  */
  if (seg && subseg)
    subseg_set (seg, subseg);

}

#endif /* SCO_ELF */

const struct format_ops elf_format_ops =
{
  bfd_target_elf_flavour,
  0,	/* dfl_leading_underscore */
  1,	/* emit_section_symbols */
  elf_frob_symbol,
  elf_frob_file,
  elf_frob_file_after_relocs,
  elf_s_get_size, elf_s_set_size,
  elf_s_get_align, elf_s_set_align,
  elf_s_get_other,
  0,	/* s_get_desc */
  elf_copy_symbol_attributes,
#ifdef NEED_ECOFF_DEBUG
  ecoff_generate_asm_lineno,
  ecoff_stab,
#else
  0,	/* generate_asm_lineno */
  0,	/* process_stab */
#endif
  elf_sec_sym_ok_for_reloc,
  elf_pop_insert,
#ifdef NEED_ECOFF_DEBUG
  elf_ecoff_set_ext,
#else
  0,	/* ecoff_set_ext */
#endif
  elf_obj_read_begin_hook,
  elf_obj_symbol_new_hook,
};