aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf-bfd.h
blob: faaf632e19a652f6c497129e95bc4eb9097c5a79 (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
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
/* BFD back-end data structures for ELF files.
   Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
   Free Software Foundation, Inc.
   Written by Cygnus Support.

   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.  */

#ifndef _LIBELF_H_
#define _LIBELF_H_ 1

#include "elf/common.h"
#include "elf/external.h"
#include "elf/internal.h"
#include "bfdlink.h"

/* The number of entries in a section is its size divided by the size
   of a single entry.  This is normally only applicable to reloc and
   symbol table sections.
   PR 9934: It is possible to have relocations that do not refer to
   symbols, thus it is also possible to have a relocation section in
   an object file, but no symbol table.  */
#define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)

/* If size isn't specified as 64 or 32, NAME macro should fail.  */
#ifndef NAME
#if ARCH_SIZE == 64
#define NAME(x, y) x ## 64 ## _ ## y
#endif
#if ARCH_SIZE == 32
#define NAME(x, y) x ## 32 ## _ ## y
#endif
#endif

#ifndef NAME
#define NAME(x, y) x ## NOSIZE ## _ ## y
#endif

#define ElfNAME(X)	NAME(Elf,X)
#define elfNAME(X)	NAME(elf,X)

/* Information held for an ELF symbol.  The first field is the
   corresponding asymbol.  Every symbol is an ELF file is actually a
   pointer to this structure, although it is often handled as a
   pointer to an asymbol.  */

typedef struct
{
  /* The BFD symbol.  */
  asymbol symbol;
  /* ELF symbol information.  */
  Elf_Internal_Sym internal_elf_sym;
  /* Backend specific information.  */
  union
    {
      unsigned int hppa_arg_reloc;
      void *mips_extr;
      void *any;
    }
  tc_data;

  /* Version information.  This is from an Elf_Internal_Versym
     structure in a SHT_GNU_versym section.  It is zero if there is no
     version information.  */
  unsigned short version;

} elf_symbol_type;

struct elf_strtab_hash;
struct got_entry;
struct plt_entry;

union gotplt_union
  {
    bfd_signed_vma refcount;
    bfd_vma offset;
    struct got_entry *glist;
    struct plt_entry *plist;
  };

struct elf_link_virtual_table_entry
  {
    /* Virtual table entry use information.  This array is nominally of size
       size/sizeof(target_void_pointer), though we have to be able to assume
       and track a size while the symbol is still undefined.  It is indexed
       via offset/sizeof(target_void_pointer).  */
    size_t size;
    bfd_boolean *used;

    /* Virtual table derivation info.  */
    struct elf_link_hash_entry *parent;
  };

/* ELF linker hash table entries.  */

struct elf_link_hash_entry
{
  struct bfd_link_hash_entry root;

  /* Symbol index in output file.  This is initialized to -1.  It is
     set to -2 if the symbol is used by a reloc.  */
  long indx;

  /* Symbol index as a dynamic symbol.  Initialized to -1, and remains
     -1 if this is not a dynamic symbol.  */
  /* ??? Note that this is consistently used as a synonym for tests
     against whether we can perform various simplifying transformations
     to the code.  (E.g. changing a pc-relative jump to a PLT entry
     into a pc-relative jump to the target function.)  That test, which
     is often relatively complex, and someplaces wrong or incomplete,
     should really be replaced by a predicate in elflink.c.

     End result: this field -1 does not indicate that the symbol is
     not in the dynamic symbol table, but rather that the symbol is
     not visible outside this DSO.  */
  long dynindx;

  /* If this symbol requires an entry in the global offset table, the
     processor specific backend uses this field to track usage and
     final offset.  Two schemes are supported:  The first assumes that
     a symbol may only have one GOT entry, and uses REFCOUNT until
     size_dynamic_sections, at which point the contents of the .got is
     fixed.  Afterward, if OFFSET is -1, then the symbol does not
     require a global offset table entry.  The second scheme allows
     multiple GOT entries per symbol, managed via a linked list
     pointed to by GLIST.  */
  union gotplt_union got;

  /* Same, but tracks a procedure linkage table entry.  */
  union gotplt_union plt;

  /* Symbol size.  */
  bfd_size_type size;

  /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.).  */
  unsigned int type : 8;

  /* Symbol st_other value, symbol visibility.  */
  unsigned int other : 8;

  /* The symbol's st_target_internal value (see Elf_Internal_Sym).  */
  unsigned int target_internal : 8;

  /* Symbol is referenced by a non-shared object (other than the object
     in which it is defined).  */
  unsigned int ref_regular : 1;
  /* Symbol is defined by a non-shared object.  */
  unsigned int def_regular : 1;
  /* Symbol is referenced by a shared object.  */
  unsigned int ref_dynamic : 1;
  /* Symbol is defined by a shared object.  */
  unsigned int def_dynamic : 1;
  /* Symbol has a non-weak reference from a non-shared object (other than
     the object in which it is defined).  */
  unsigned int ref_regular_nonweak : 1;
  /* Dynamic symbol has been adjustd.  */
  unsigned int dynamic_adjusted : 1;
  /* Symbol needs a copy reloc.  */
  unsigned int needs_copy : 1;
  /* Symbol needs a procedure linkage table entry.  */
  unsigned int needs_plt : 1;
  /* Symbol appears in a non-ELF input file.  */
  unsigned int non_elf : 1;
  /* Symbol should be marked as hidden in the version information.  */
  unsigned int hidden : 1;
  /* Symbol was forced to local scope due to a version script file.  */
  unsigned int forced_local : 1;
  /* Symbol was forced to be dynamic due to a version script file.  */
  unsigned int dynamic : 1;
  /* Symbol was marked during garbage collection.  */
  unsigned int mark : 1;
  /* Symbol is referenced by a non-GOT/non-PLT relocation.  This is
     not currently set by all the backends.  */
  unsigned int non_got_ref : 1;
  /* Symbol has a definition in a shared object.
     FIXME: There is no real need for this field if def_dynamic is never
     cleared and all places that test def_dynamic also test def_regular.  */
  unsigned int dynamic_def : 1;
  /* Symbol has a non-weak reference from a shared object.  */
  unsigned int ref_dynamic_nonweak : 1;
  /* Symbol is referenced with a relocation where C/C++ pointer equality
     matters.  */
  unsigned int pointer_equality_needed : 1;
  /* Symbol is a unique global symbol.  */
  unsigned int unique_global : 1;

  /* String table index in .dynstr if this is a dynamic symbol.  */
  unsigned long dynstr_index;

  union
  {
    /* If this is a weak defined symbol from a dynamic object, this
       field points to a defined symbol with the same value, if there is
       one.  Otherwise it is NULL.  */
    struct elf_link_hash_entry *weakdef;

    /* Hash value of the name computed using the ELF hash function.
       Used part way through size_dynamic_sections, after we've finished
       with weakdefs.  */
    unsigned long elf_hash_value;
  } u;

  /* Version information.  */
  union
  {
    /* This field is used for a symbol which is not defined in a
       regular object.  It points to the version information read in
       from the dynamic object.  */
    Elf_Internal_Verdef *verdef;
    /* This field is used for a symbol which is defined in a regular
       object.  It is set up in size_dynamic_sections.  It points to
       the version information we should write out for this symbol.  */
    struct bfd_elf_version_tree *vertree;
  } verinfo;

  struct elf_link_virtual_table_entry *vtable;
};

/* Will references to this symbol always reference the symbol
   in this object?  */
#define SYMBOL_REFERENCES_LOCAL(INFO, H) \
  _bfd_elf_symbol_refs_local_p (H, INFO, 0)

/* Will _calls_ to this symbol always call the version in this object?  */
#define SYMBOL_CALLS_LOCAL(INFO, H) \
  _bfd_elf_symbol_refs_local_p (H, INFO, 1)

/* Common symbols that are turned into definitions don't have the
   DEF_REGULAR flag set, so they might appear to be undefined.  */
#define ELF_COMMON_DEF_P(H) \
  (!(H)->def_regular							\
   && !(H)->def_dynamic							\
   && (H)->root.type == bfd_link_hash_defined)

/* Records local symbols to be emitted in the dynamic symbol table.  */

struct elf_link_local_dynamic_entry
{
  struct elf_link_local_dynamic_entry *next;

  /* The input bfd this symbol came from.  */
  bfd *input_bfd;

  /* The index of the local symbol being copied.  */
  long input_indx;

  /* The index in the outgoing dynamic symbol table.  */
  long dynindx;

  /* A copy of the input symbol.  */
  Elf_Internal_Sym isym;
};

struct elf_link_loaded_list
{
  struct elf_link_loaded_list *next;
  bfd *abfd;
};

/* Structures used by the eh_frame optimization code.  */
struct eh_cie_fde
{
  union {
    struct {
      /* If REMOVED == 1, this is the CIE that the FDE originally used.
	 The CIE belongs to the same .eh_frame input section as the FDE.

	 If REMOVED == 0, this is the CIE that we have chosen to use for
	 the output FDE.  The CIE's REMOVED field is also 0, but the CIE
	 might belong to a different .eh_frame input section from the FDE.  */
      struct eh_cie_fde *cie_inf;
      struct eh_cie_fde *next_for_section;
    } fde;
    struct {
      /* CIEs have three states:

	 - REMOVED && !MERGED: Slated for removal because we haven't yet
	   proven that an FDE needs it.  FULL_CIE, if nonnull, points to
	   more detailed information about the CIE.

	 - REMOVED && MERGED: We have merged this CIE with MERGED_WITH,
	   which may not belong to the same input section.

	 - !REMOVED: We have decided to keep this CIE.  SEC is the
	   .eh_frame input section that contains the CIE.  */
      union {
	struct cie *full_cie;
 	struct eh_cie_fde *merged_with;
 	asection *sec;
      } u;

      /* The offset of the personality data from the start of the CIE,
	 or 0 if the CIE doesn't have any.  */
      unsigned int personality_offset : 8;

      /* True if we have marked relocations associated with this CIE.  */
      unsigned int gc_mark : 1;

      /* True if we have decided to turn an absolute LSDA encoding into
	 a PC-relative one.  */
      unsigned int make_lsda_relative : 1;

      /* True if we have decided to turn an absolute personality
	 encoding into a PC-relative one.  */
      unsigned int make_per_encoding_relative : 1;

      /* True if the CIE contains personality data and if that
	 data uses a PC-relative encoding.  Always true when
	 make_per_encoding_relative is.  */
      unsigned int per_encoding_relative : 1;

      /* True if we need to add an 'R' (FDE encoding) entry to the
	 CIE's augmentation data.  */
      unsigned int add_fde_encoding : 1;

      /* True if we have merged this CIE with another.  */
      unsigned int merged : 1;

      /* Unused bits.  */
      unsigned int pad1 : 18;
    } cie;
  } u;
  unsigned int reloc_index;
  unsigned int size;
  unsigned int offset;
  unsigned int new_offset;
  unsigned int fde_encoding : 8;
  unsigned int lsda_encoding : 8;
  unsigned int lsda_offset : 8;

  /* True if this entry represents a CIE, false if it represents an FDE.  */
  unsigned int cie : 1;

  /* True if this entry is currently marked for removal.  */
  unsigned int removed : 1;

  /* True if we need to add a 'z' (augmentation size) entry to the CIE's
     augmentation data, and an associated byte to each of the CIE's FDEs.  */
  unsigned int add_augmentation_size : 1;

  /* True if we have decided to convert absolute FDE relocations into
     relative ones.  This applies to the first relocation in the FDE,
     which is against the code that the FDE describes.  */
  unsigned int make_relative : 1;

  /* Unused bits.  */
  unsigned int pad1 : 4;

  unsigned int *set_loc;
};

struct eh_frame_sec_info
{
  unsigned int count;
  struct cie *cies;
  struct eh_cie_fde entry[1];
};

struct eh_frame_array_ent
{
  bfd_vma initial_loc;
  bfd_vma fde;
};

struct htab;

struct eh_frame_hdr_info
{
  struct htab *cies;
  asection *hdr_sec;
  unsigned int fde_count, array_count;
  struct eh_frame_array_ent *array;
  /* TRUE if we should try to merge CIEs between input sections.  */
  bfd_boolean merge_cies;
  /* TRUE if all .eh_frames have been parsd.  */
  bfd_boolean parsed_eh_frames;
  /* TRUE if .eh_frame_hdr should contain the sorted search table.
     We build it if we successfully read all .eh_frame input sections
     and recognize them.  */
  bfd_boolean table;
};

/* Enum used to identify target specific extensions to the elf_obj_tdata
   and elf_link_hash_table structures.  Note the enums deliberately start
   from 1 so that we can detect an uninitialized field.  The generic value
   is last so that additions to this enum do not need to modify more than
   one line.  */
enum elf_target_id
{
  AARCH64_ELF_DATA = 1,
  ALPHA_ELF_DATA,
  ARM_ELF_DATA,
  AVR_ELF_DATA,
  BFIN_ELF_DATA,
  CRIS_ELF_DATA,
  FRV_ELF_DATA,
  HPPA32_ELF_DATA,
  HPPA64_ELF_DATA,
  I386_ELF_DATA,
  IA64_ELF_DATA,
  LM32_ELF_DATA,
  M32R_ELF_DATA,
  M68HC11_ELF_DATA,
  M68K_ELF_DATA,
  METAG_ELF_DATA,
  MICROBLAZE_ELF_DATA,
  MIPS_ELF_DATA,
  MN10300_ELF_DATA,
  PPC32_ELF_DATA,
  PPC64_ELF_DATA,
  S390_ELF_DATA,
  SH_ELF_DATA,
  SPARC_ELF_DATA,
  SPU_ELF_DATA,
  TIC6X_ELF_DATA,
  X86_64_ELF_DATA,
  XTENSA_ELF_DATA,
  XGATE_ELF_DATA,
  TILEGX_ELF_DATA,
  TILEPRO_ELF_DATA,
  GENERIC_ELF_DATA
};

/* ELF linker hash table.  */

struct elf_link_hash_table
{
  struct bfd_link_hash_table root;

  /* An identifier used to distinguish different target
     specific extensions to this structure.  */
  enum elf_target_id hash_table_id;

  /* Whether we have created the special dynamic sections required
     when linking against or generating a shared object.  */
  bfd_boolean dynamic_sections_created;

  /* True if this target has relocatable executables, so needs dynamic
     section symbols.  */
  bfd_boolean is_relocatable_executable;

  /* The BFD used to hold special sections created by the linker.
     This will be the first BFD found which requires these sections to
     be created.  */
  bfd *dynobj;

  /* The value to use when initialising got.refcount/offset and
     plt.refcount/offset in an elf_link_hash_entry.  Set to zero when
     the values are refcounts.  Set to init_got_offset/init_plt_offset
     in size_dynamic_sections when the values may be offsets.  */
  union gotplt_union init_got_refcount;
  union gotplt_union init_plt_refcount;

  /* The value to use for got.refcount/offset and plt.refcount/offset
     when the values may be offsets.  Normally (bfd_vma) -1.  */
  union gotplt_union init_got_offset;
  union gotplt_union init_plt_offset;

  /* The number of symbols found in the link which must be put into
     the .dynsym section.  */
  bfd_size_type dynsymcount;

  /* The string table of dynamic symbols, which becomes the .dynstr
     section.  */
  struct elf_strtab_hash *dynstr;

  /* The number of buckets in the hash table in the .hash section.
     This is based on the number of dynamic symbols.  */
  bfd_size_type bucketcount;

  /* A linked list of DT_NEEDED names found in dynamic objects
     included in the link.  */
  struct bfd_link_needed_list *needed;

  /* Sections in the output bfd that provides a section symbol
     to be used by relocations emitted against local symbols.
     Most targets will not use data_index_section.  */
  asection *text_index_section;
  asection *data_index_section;

  /* The _GLOBAL_OFFSET_TABLE_ symbol.  */
  struct elf_link_hash_entry *hgot;

  /* The _PROCEDURE_LINKAGE_TABLE_ symbol.  */
  struct elf_link_hash_entry *hplt;

  /* The _DYNAMIC symbol.  */
  struct elf_link_hash_entry *hdynamic;

  /* A pointer to information used to merge SEC_MERGE sections.  */
  void *merge_info;

  /* Used to link stabs in sections.  */
  struct stab_info stab_info;

  /* Used by eh_frame code when editing .eh_frame.  */
  struct eh_frame_hdr_info eh_info;

  /* A linked list of local symbols to be added to .dynsym.  */
  struct elf_link_local_dynamic_entry *dynlocal;

  /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
     objects included in the link.  */
  struct bfd_link_needed_list *runpath;

  /* Cached first output tls section and size of PT_TLS segment.  */
  asection *tls_sec;
  bfd_size_type tls_size;

  /* A linked list of BFD's loaded in the link.  */
  struct elf_link_loaded_list *loaded;

  /* Short-cuts to get to dynamic linker sections.  */
  asection *sgot;
  asection *sgotplt;
  asection *srelgot;
  asection *splt;
  asection *srelplt;
  asection *igotplt;
  asection *iplt;
  asection *irelplt;
  asection *irelifunc;
};

/* Look up an entry in an ELF linker hash table.  */

#define elf_link_hash_lookup(table, string, create, copy, follow)	\
  ((struct elf_link_hash_entry *)					\
   bfd_link_hash_lookup (&(table)->root, (string), (create),		\
			 (copy), (follow)))

/* Traverse an ELF linker hash table.  */

#define elf_link_hash_traverse(table, func, info)			\
  (bfd_link_hash_traverse						\
   (&(table)->root,							\
    (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func),	\
    (info)))

/* Get the ELF linker hash table from a link_info structure.  */

#define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))

#define elf_hash_table_id(table)	((table) -> hash_table_id)

/* Returns TRUE if the hash table is a struct elf_link_hash_table.  */
#define is_elf_hash_table(htab)					      	\
  (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)

/* Used by bfd_sym_from_r_symndx to cache a small number of local
   symbols.  */
#define LOCAL_SYM_CACHE_SIZE 32
struct sym_cache
{
  bfd *abfd;
  unsigned long indx[LOCAL_SYM_CACHE_SIZE];
  Elf_Internal_Sym sym[LOCAL_SYM_CACHE_SIZE];
};

/* Constant information held for an ELF backend.  */

struct elf_size_info {
  unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
  unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;

  /* The size of entries in the .hash section.  */
  unsigned char sizeof_hash_entry;

  /* The number of internal relocations to allocate per external
     relocation entry.  */
  unsigned char int_rels_per_ext_rel;
  /* We use some fixed size arrays.  This should be large enough to
     handle all back-ends.  */
#define MAX_INT_RELS_PER_EXT_REL 3

  unsigned char arch_size, log_file_align;
  unsigned char elfclass, ev_current;
  int (*write_out_phdrs)
    (bfd *, const Elf_Internal_Phdr *, unsigned int);
  bfd_boolean
    (*write_shdrs_and_ehdr) (bfd *);
  bfd_boolean (*checksum_contents)
    (bfd * , void (*) (const void *, size_t, void *), void *);
  void (*write_relocs)
    (bfd *, asection *, void *);
  bfd_boolean (*swap_symbol_in)
    (bfd *, const void *, const void *, Elf_Internal_Sym *);
  void (*swap_symbol_out)
    (bfd *, const Elf_Internal_Sym *, void *, void *);
  bfd_boolean (*slurp_reloc_table)
    (bfd *, asection *, asymbol **, bfd_boolean);
  long (*slurp_symbol_table)
    (bfd *, asymbol **, bfd_boolean);
  void (*swap_dyn_in)
    (bfd *, const void *, Elf_Internal_Dyn *);
  void (*swap_dyn_out)
    (bfd *, const Elf_Internal_Dyn *, void *);

  /* This function is called to swap in a REL relocation.  If an
     external relocation corresponds to more than one internal
     relocation, then all relocations are swapped in at once.  */
  void (*swap_reloc_in)
    (bfd *, const bfd_byte *, Elf_Internal_Rela *);

  /* This function is called to swap out a REL relocation.  */
  void (*swap_reloc_out)
    (bfd *, const Elf_Internal_Rela *, bfd_byte *);

  /* This function is called to swap in a RELA relocation.  If an
     external relocation corresponds to more than one internal
     relocation, then all relocations are swapped in at once.  */
  void (*swap_reloca_in)
    (bfd *, const bfd_byte *, Elf_Internal_Rela *);

  /* This function is called to swap out a RELA relocation.  */
  void (*swap_reloca_out)
    (bfd *, const Elf_Internal_Rela *, bfd_byte *);
};

#define elf_symbol_from(ABFD,S) \
	(((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
	  && (S)->the_bfd->tdata.elf_obj_data != 0) \
	 ? (elf_symbol_type *) (S) \
	 : 0)

enum elf_reloc_type_class {
  reloc_class_normal,
  reloc_class_relative,
  reloc_class_plt,
  reloc_class_copy
};

struct elf_reloc_cookie
{
  Elf_Internal_Rela *rels, *rel, *relend;
  Elf_Internal_Sym *locsyms;
  bfd *abfd;
  size_t locsymcount;
  size_t extsymoff;
  struct elf_link_hash_entry **sym_hashes;
  int r_sym_shift;
  bfd_boolean bad_symtab;
};

/* The level of IRIX compatibility we're striving for.  */

typedef enum {
  ict_none,
  ict_irix5,
  ict_irix6
} irix_compat_t;

/* Mapping of ELF section names and types.  */
struct bfd_elf_special_section
{
  const char *prefix;
  int prefix_length;
  /* 0 means name must match PREFIX exactly.
     -1 means name must start with PREFIX followed by an arbitrary string.
     -2 means name must match PREFIX exactly or consist of PREFIX followed
     by a dot then anything.
     > 0 means name must start with the first PREFIX_LENGTH chars of
     PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX.  */
  int suffix_length;
  int type;
  bfd_vma attr;
};

enum action_discarded
  {
    COMPLAIN = 1,
    PRETEND = 2
  };

typedef asection * (*elf_gc_mark_hook_fn)
  (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
   struct elf_link_hash_entry *, Elf_Internal_Sym *);

struct elf_backend_data
{
  /* The architecture for this backend.  */
  enum bfd_architecture arch;

  /* An identifier used to distinguish different target specific
     extensions to elf_obj_tdata and elf_link_hash_table structures.  */
  enum elf_target_id target_id;

  /* The ELF machine code (EM_xxxx) for this backend.  */
  int elf_machine_code;

  /* EI_OSABI. */
  int elf_osabi;

  /* The maximum page size for this backend.  */
  bfd_vma maxpagesize;

  /* The minimum page size for this backend.  An input object will not be
     considered page aligned unless its sections are correctly aligned for
     pages at least this large.  May be smaller than maxpagesize.  */
  bfd_vma minpagesize;

  /* The common page size for this backend.  */
  bfd_vma commonpagesize;

  /* The BFD flags applied to sections created for dynamic linking.  */
  flagword dynamic_sec_flags;

  /* Architecture-specific data for this backend.
     This is actually a pointer to some type like struct elf_ARCH_data.  */
  const void *arch_data;

  /* A function to translate an ELF RELA relocation to a BFD arelent
     structure.  */
  void (*elf_info_to_howto)
    (bfd *, arelent *, Elf_Internal_Rela *);

  /* A function to translate an ELF REL relocation to a BFD arelent
     structure.  */
  void (*elf_info_to_howto_rel)
    (bfd *, arelent *, Elf_Internal_Rela *);

  /* A function to determine whether a symbol is global when
     partitioning the symbol table into local and global symbols.
     This should be NULL for most targets, in which case the correct
     thing will be done.  MIPS ELF, at least on the Irix 5, has
     special requirements.  */
  bfd_boolean (*elf_backend_sym_is_global)
    (bfd *, asymbol *);

  /* The remaining functions are hooks which are called only if they
     are not NULL.  */

  /* A function to permit a backend specific check on whether a
     particular BFD format is relevant for an object file, and to
     permit the backend to set any global information it wishes.  When
     this is called elf_elfheader is set, but anything else should be
     used with caution.  If this returns FALSE, the check_format
     routine will return a bfd_error_wrong_format error.  */
  bfd_boolean (*elf_backend_object_p)
    (bfd *);

  /* A function to do additional symbol processing when reading the
     ELF symbol table.  This is where any processor-specific special
     section indices are handled.  */
  void (*elf_backend_symbol_processing)
    (bfd *, asymbol *);

  /* A function to do additional symbol processing after reading the
     entire ELF symbol table.  */
  bfd_boolean (*elf_backend_symbol_table_processing)
    (bfd *, elf_symbol_type *, unsigned int);

  /* A function to set the type of the info field.  Processor-specific
     types should be handled here.  */
  int (*elf_backend_get_symbol_type)
    (Elf_Internal_Sym *, int);

  /* A function to return the linker hash table entry of a symbol that
     might be satisfied by an archive symbol.  */
  struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
    (bfd *, struct bfd_link_info *, const char *);

  /* Return true if local section symbols should have a non-null st_name.
     NULL implies false.  */
  bfd_boolean (*elf_backend_name_local_section_symbols)
    (bfd *);

  /* A function to do additional processing on the ELF section header
     just before writing it out.  This is used to set the flags and
     type fields for some sections, or to actually write out data for
     unusual sections.  */
  bfd_boolean (*elf_backend_section_processing)
    (bfd *, Elf_Internal_Shdr *);

  /* A function to handle unusual section types when creating BFD
     sections from ELF sections.  */
  bfd_boolean (*elf_backend_section_from_shdr)
    (bfd *, Elf_Internal_Shdr *, const char *, int);

  /* A function to convert machine dependent ELF section header flags to
     BFD internal section header flags.  */
  bfd_boolean (*elf_backend_section_flags)
    (flagword *, const Elf_Internal_Shdr *);

  /* A function that returns a struct containing ELF section flags and
     type for the given BFD section.   */
  const struct bfd_elf_special_section * (*get_sec_type_attr)
    (bfd *, asection *);

  /* A function to handle unusual program segment types when creating BFD
     sections from ELF program segments.  */
  bfd_boolean (*elf_backend_section_from_phdr)
    (bfd *, Elf_Internal_Phdr *, int, const char *);

  /* A function to set up the ELF section header for a BFD section in
     preparation for writing it out.  This is where the flags and type
     fields are set for unusual sections.  */
  bfd_boolean (*elf_backend_fake_sections)
    (bfd *, Elf_Internal_Shdr *, asection *);

  /* A function to get the ELF section index for a BFD section.  If
     this returns TRUE, the section was found.  If it is a normal ELF
     section, *RETVAL should be left unchanged.  If it is not a normal
     ELF section *RETVAL should be set to the SHN_xxxx index.  */
  bfd_boolean (*elf_backend_section_from_bfd_section)
    (bfd *, asection *, int *retval);

  /* If this field is not NULL, it is called by the add_symbols phase
     of a link just before adding a symbol to the global linker hash
     table.  It may modify any of the fields as it wishes.  If *NAME
     is set to NULL, the symbol will be skipped rather than being
     added to the hash table.  This function is responsible for
     handling all processor dependent symbol bindings and section
     indices, and must set at least *FLAGS and *SEC for each processor
     dependent case; failure to do so will cause a link error.  */
  bfd_boolean (*elf_add_symbol_hook)
    (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
     const char **name, flagword *flags, asection **sec, bfd_vma *value);

  /* If this field is not NULL, it is called by the elf_link_output_sym
     phase of a link for each symbol which will appear in the object file.
     On error, this function returns 0.  1 is returned when the symbol
     should be output, 2 is returned when the symbol should be discarded.  */
  int (*elf_backend_link_output_symbol_hook)
    (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
     asection *, struct elf_link_hash_entry *);

  /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
     linker the first time it encounters a dynamic object in the link.
     This function must create any sections required for dynamic
     linking.  The ABFD argument is a dynamic object.  The .interp,
     .dynamic, .dynsym, .dynstr, and .hash functions have already been
     created, and this function may modify the section flags if
     desired.  This function will normally create the .got and .plt
     sections, but different backends have different requirements.  */
  bfd_boolean (*elf_backend_create_dynamic_sections)
    (bfd *abfd, struct bfd_link_info *info);

  /* When creating a shared library, determine whether to omit the
     dynamic symbol for the section.  */
  bfd_boolean (*elf_backend_omit_section_dynsym)
    (bfd *output_bfd, struct bfd_link_info *info, asection *osec);

  /* Return TRUE if relocations of targets are compatible to the extent
     that CHECK_RELOCS will properly process them.  PR 4424.  */
  bfd_boolean (*relocs_compatible) (const bfd_target *, const bfd_target *);

  /* The CHECK_RELOCS function is called by the add_symbols phase of
     the ELF backend linker.  It is called once for each section with
     relocs of an object file, just after the symbols for the object
     file have been added to the global linker hash table.  The
     function must look through the relocs and do any special handling
     required.  This generally means allocating space in the global
     offset table, and perhaps allocating space for a reloc.  The
     relocs are always passed as Rela structures; if the section
     actually uses Rel structures, the r_addend field will always be
     zero.  */
  bfd_boolean (*check_relocs)
    (bfd *abfd, struct bfd_link_info *info, asection *o,
     const Elf_Internal_Rela *relocs);

  /* The CHECK_DIRECTIVES function is called once per input file by
     the add_symbols phase of the ELF backend linker.  The function
     must inspect the bfd and create any additional symbols according
     to any custom directives in the bfd.  */
  bfd_boolean (*check_directives)
    (bfd *abfd, struct bfd_link_info *info);

  /* The AS_NEEDED_CLEANUP function is called once per --as-needed
     input file that was not needed by the add_symbols phase of the
     ELF backend linker.  The function must undo any target specific
     changes in the symbol hash table.  */
  bfd_boolean (*as_needed_cleanup)
    (bfd *abfd, struct bfd_link_info *info);

  /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
     linker for every symbol which is defined by a dynamic object and
     referenced by a regular object.  This is called after all the
     input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
     function has been called.  The hash table entry should be
     bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
     defined in a section from a dynamic object.  Dynamic object
     sections are not included in the final link, and this function is
     responsible for changing the value to something which the rest of
     the link can deal with.  This will normally involve adding an
     entry to the .plt or .got or some such section, and setting the
     symbol to point to that.  */
  bfd_boolean (*elf_backend_adjust_dynamic_symbol)
    (struct bfd_link_info *info, struct elf_link_hash_entry *h);

  /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
     after all the linker input files have been seen but before the
     section sizes have been set.  This is called after
     ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS.  */
  bfd_boolean (*elf_backend_always_size_sections)
    (bfd *output_bfd, struct bfd_link_info *info);

  /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
     linker after all the linker input files have been seen but before
     the sections sizes have been set.  This is called after
     ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
     It is only called when linking against a dynamic object.  It must
     set the sizes of the dynamic sections, and may fill in their
     contents as well.  The generic ELF linker can handle the .dynsym,
     .dynstr and .hash sections.  This function must handle the
     .interp section and any sections created by the
     CREATE_DYNAMIC_SECTIONS entry point.  */
  bfd_boolean (*elf_backend_size_dynamic_sections)
    (bfd *output_bfd, struct bfd_link_info *info);

  /* Set TEXT_INDEX_SECTION and DATA_INDEX_SECTION, the output sections
     we keep to use as a base for relocs and symbols.  */
  void (*elf_backend_init_index_section)
    (bfd *output_bfd, struct bfd_link_info *info);

  /* The RELOCATE_SECTION function is called by the ELF backend linker
     to handle the relocations for a section.

     The relocs are always passed as Rela structures; if the section
     actually uses Rel structures, the r_addend field will always be
     zero.

     This function is responsible for adjust the section contents as
     necessary, and (if using Rela relocs and generating a
     relocatable output file) adjusting the reloc addend as
     necessary.

     This function does not have to worry about setting the reloc
     address or the reloc symbol index.

     LOCAL_SYMS is a pointer to the swapped in local symbols.

     LOCAL_SECTIONS is an array giving the section in the input file
     corresponding to the st_shndx field of each local symbol.

     The global hash table entry for the global symbols can be found
     via elf_sym_hashes (input_bfd).

     When generating relocatable output, this function must handle
     STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
     going to be the section symbol corresponding to the output
     section, which means that the addend must be adjusted
     accordingly.

     Returns FALSE on error, TRUE on success, 2 if successful and
     relocations should be written for this section.  */
  int (*elf_backend_relocate_section)
    (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
     asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
     Elf_Internal_Sym *local_syms, asection **local_sections);

  /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
     linker just before it writes a symbol out to the .dynsym section.
     The processor backend may make any required adjustment to the
     symbol.  It may also take the opportunity to set contents of the
     dynamic sections.  Note that FINISH_DYNAMIC_SYMBOL is called on
     all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
     on those symbols which are defined by a dynamic object.  */
  bfd_boolean (*elf_backend_finish_dynamic_symbol)
    (bfd *output_bfd, struct bfd_link_info *info,
     struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);

  /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
     linker just before it writes all the dynamic sections out to the
     output file.  The FINISH_DYNAMIC_SYMBOL will have been called on
     all dynamic symbols.  */
  bfd_boolean (*elf_backend_finish_dynamic_sections)
    (bfd *output_bfd, struct bfd_link_info *info);

  /* A function to do any beginning processing needed for the ELF file
     before building the ELF headers and computing file positions.  */
  void (*elf_backend_begin_write_processing)
    (bfd *, struct bfd_link_info *);

  /* A function to do any final processing needed for the ELF file
     before writing it out.  The LINKER argument is TRUE if this BFD
     was created by the ELF backend linker.  */
  void (*elf_backend_final_write_processing)
    (bfd *, bfd_boolean linker);

  /* This function is called by get_program_header_size.  It should
     return the number of additional program segments which this BFD
     will need.  It should return -1 on error.  */
  int (*elf_backend_additional_program_headers)
    (bfd *, struct bfd_link_info *);

  /* This function is called to modify an existing segment map in a
     backend specific fashion.  */
  bfd_boolean (*elf_backend_modify_segment_map)
    (bfd *, struct bfd_link_info *);

  /* This function is called to modify program headers just before
     they are written.  */
  bfd_boolean (*elf_backend_modify_program_headers)
    (bfd *, struct bfd_link_info *);

  /* This function is called before section garbage collection to
     mark entry symbol sections.  */
  void (*gc_keep)
    (struct bfd_link_info *);

  /* This function is called during section garbage collection to
     mark sections that define global symbols.  */
  bfd_boolean (*gc_mark_dynamic_ref)
    (struct elf_link_hash_entry *, void *);

  /* This function is called during section gc to discover the section a
     particular relocation refers to.  */
  elf_gc_mark_hook_fn gc_mark_hook;

  /* This function, if defined, is called after the first gc marking pass
     to allow the backend to mark additional sections.  */
  bfd_boolean (*gc_mark_extra_sections)
    (struct bfd_link_info *, elf_gc_mark_hook_fn);

  /* This function, if defined, is called during the sweep phase of gc
     in order that a backend might update any data structures it might
     be maintaining.  */
  bfd_boolean (*gc_sweep_hook)
    (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);

  /* This function, if defined, is called after the ELF headers have
     been created.  This allows for things like the OS and ABI versions
     to be changed.  */
  void (*elf_backend_post_process_headers)
    (bfd *, struct bfd_link_info *);

  /* This function, if defined, prints a symbol to file and returns the
     name of the symbol to be printed.  It should return NULL to fall
     back to default symbol printing.  */
  const char *(*elf_backend_print_symbol_all)
    (bfd *, void *, asymbol *);

  /* This function, if defined, is called after all local symbols and
     global symbols converted to locals are emitted into the symtab
     section.  It allows the backend to emit special local symbols
     not handled in the hash table.  */
  bfd_boolean (*elf_backend_output_arch_local_syms)
    (bfd *, struct bfd_link_info *, void *,
     bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
		      struct elf_link_hash_entry *));

  /* This function, if defined, is called after all symbols are emitted
     into the symtab section.  It allows the backend to emit special
     global symbols not handled in the hash table.  */
  bfd_boolean (*elf_backend_output_arch_syms)
    (bfd *, struct bfd_link_info *, void *,
     bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
		      struct elf_link_hash_entry *));

  /* Copy any information related to dynamic linking from a pre-existing
     symbol to a newly created symbol.  Also called to copy flags and
     other back-end info to a weakdef, in which case the symbol is not
     newly created and plt/got refcounts and dynamic indices should not
     be copied.  */
  void (*elf_backend_copy_indirect_symbol)
    (struct bfd_link_info *, struct elf_link_hash_entry *,
     struct elf_link_hash_entry *);

  /* Modify any information related to dynamic linking such that the
     symbol is not exported.  */
  void (*elf_backend_hide_symbol)
    (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);

  /* A function to do additional symbol fixup, called by
     _bfd_elf_fix_symbol_flags.  */
  bfd_boolean (*elf_backend_fixup_symbol)
    (struct bfd_link_info *, struct elf_link_hash_entry *);

  /* Merge the backend specific symbol attribute.  */
  void (*elf_backend_merge_symbol_attribute)
    (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
     bfd_boolean);

  /* This function, if defined, will return a string containing the
     name of a target-specific dynamic tag.  */
  char *(*elf_backend_get_target_dtag)
    (bfd_vma);

  /* Decide whether an undefined symbol is special and can be ignored.
     This is the case for OPTIONAL symbols on IRIX.  */
  bfd_boolean (*elf_backend_ignore_undef_symbol)
    (struct elf_link_hash_entry *);

  /* Emit relocations.  Overrides default routine for emitting relocs,
     except during a relocatable link, or if all relocs are being emitted.  */
  bfd_boolean (*elf_backend_emit_relocs)
    (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
     struct elf_link_hash_entry **);

  /* Count relocations.  Not called for relocatable links
     or if all relocs are being preserved in the output.  */
  unsigned int (*elf_backend_count_relocs)
    (struct bfd_link_info *, asection *);

  /* This function, if defined, is called when an NT_PRSTATUS note is found
     in a core file.  */
  bfd_boolean (*elf_backend_grok_prstatus)
    (bfd *, Elf_Internal_Note *);

  /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
     note is found in a core file.  */
  bfd_boolean (*elf_backend_grok_psinfo)
    (bfd *, Elf_Internal_Note *);

  /* This function, if defined, is called to write a note to a corefile.  */
  char *(*elf_backend_write_core_note)
    (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);

  /* This function, if defined, is called to convert target-specific
     section flag names into hex values.  */
  flagword (*elf_backend_lookup_section_flags_hook)
    (char *);

  /* This function returns class of a reloc type.  */
  enum elf_reloc_type_class (*elf_backend_reloc_type_class)
    (const Elf_Internal_Rela *);

  /* This function, if defined, removes information about discarded functions
     from other sections which mention them.  */
  bfd_boolean (*elf_backend_discard_info)
    (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);

  /* This function, if defined, signals that the function above has removed
     the discarded relocations for this section.  */
  bfd_boolean (*elf_backend_ignore_discarded_relocs)
    (asection *);

  /* What to do when ld finds relocations against symbols defined in
     discarded sections.  */
  unsigned int (*action_discarded)
    (asection *);

  /* This function returns the width of FDE pointers in bytes, or 0 if
     that can't be determined for some reason.  The default definition
     goes by the bfd's EI_CLASS.  */
  unsigned int (*elf_backend_eh_frame_address_size)
    (bfd *, asection *);

  /* These functions tell elf-eh-frame whether to attempt to turn
     absolute or lsda encodings into pc-relative ones.  The default
     definition enables these transformations.  */
  bfd_boolean (*elf_backend_can_make_relative_eh_frame)
     (bfd *, struct bfd_link_info *, asection *);
  bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
     (bfd *, struct bfd_link_info *, asection *);

  /* This function returns an encoding after computing the encoded
     value (and storing it in ENCODED) for the given OFFSET into OSEC,
     to be stored in at LOC_OFFSET into the LOC_SEC input section.
     The default definition chooses a 32-bit PC-relative encoding.  */
  bfd_byte (*elf_backend_encode_eh_address)
     (bfd *abfd, struct bfd_link_info *info,
      asection *osec, bfd_vma offset,
      asection *loc_sec, bfd_vma loc_offset,
      bfd_vma *encoded);

  /* This function, if defined, may write out the given section.
     Returns TRUE if it did so and FALSE if the caller should.  */
  bfd_boolean (*elf_backend_write_section)
    (bfd *, struct bfd_link_info *, asection *, bfd_byte *);

  /* The level of IRIX compatibility we're striving for.
     MIPS ELF specific function.  */
  irix_compat_t (*elf_backend_mips_irix_compat)
    (bfd *);

  reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
    (unsigned int, bfd_boolean);

  /* The swapping table to use when dealing with ECOFF information.
     Used for the MIPS ELF .mdebug section.  */
  const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;

  /* This function implements `bfd_elf_bfd_from_remote_memory';
     see elf.c, elfcode.h.  */
  bfd *(*elf_backend_bfd_from_remote_memory)
     (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
      int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr,
				 bfd_size_type len));

  /* This function is used by `_bfd_elf_get_synthetic_symtab';
     see elf.c.  */
  bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);

  /* Is symbol defined in common section?  */
  bfd_boolean (*common_definition) (Elf_Internal_Sym *);

  /* Return a common section index for section.  */
  unsigned int (*common_section_index) (asection *);

  /* Return a common section for section.  */
  asection *(*common_section) (asection *);

  /* Return TRUE if we can merge 2 definitions.  */
  bfd_boolean (*merge_symbol) (struct bfd_link_info *,
			       struct elf_link_hash_entry **,
			       struct elf_link_hash_entry *,
			       Elf_Internal_Sym *, asection **,
			       bfd_vma *, unsigned int *,
			       bfd_boolean *, bfd_boolean *,
			       bfd_boolean *, bfd_boolean *,
			       bfd_boolean *, bfd_boolean *,
			       bfd_boolean *, bfd_boolean *,
			       bfd *, asection **,
			       bfd_boolean *, bfd_boolean *,
			       bfd_boolean *, bfd_boolean *,
			       bfd *, asection **);

  /* Return TRUE if symbol should be hashed in the `.gnu.hash' section.  */
  bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);

  /* Return TRUE if type is a function symbol type.  */
  bfd_boolean (*is_function_type) (unsigned int type);

  /* If the ELF symbol SYM might be a function in SEC, return the
     function size and set *CODE_OFF to the function's entry point,
     otherwise return zero.  */
  bfd_size_type (*maybe_function_sym) (const asymbol *sym, asection *sec,
				       bfd_vma *code_off);

  /* Used to handle bad SHF_LINK_ORDER input.  */
  bfd_error_handler_type link_order_error_handler;

  /* Name of the PLT relocation section.  */
  const char *relplt_name;

  /* Alternate EM_xxxx machine codes for this backend.  */
  int elf_machine_alt1;
  int elf_machine_alt2;

  const struct elf_size_info *s;

  /* An array of target specific special sections.  */
  const struct bfd_elf_special_section *special_sections;

  /* The size in bytes of the header for the GOT.  This includes the
     so-called reserved entries on some systems.  */
  bfd_vma got_header_size;

  /* The size of the GOT entry for the symbol pointed to by H if non-NULL,
     otherwise by the local symbol with index SYMNDX in IBFD.  */
  bfd_vma (*got_elt_size) (bfd *, struct bfd_link_info *,
			   struct elf_link_hash_entry *h,
			   bfd *ibfd, unsigned long symndx);

  /* The vendor name to use for a processor-standard attributes section.  */
  const char *obj_attrs_vendor;

  /* The section name to use for a processor-standard attributes section.  */
  const char *obj_attrs_section;

  /* Return 1, 2 or 3 to indicate what type of arguments a
     processor-specific tag takes.  */
  int (*obj_attrs_arg_type) (int);

  /* The section type to use for an attributes section.  */
  unsigned int obj_attrs_section_type;

  /* This function determines the order in which any attributes are
     written.  It must be defined for input in the range
     LEAST_KNOWN_OBJ_ATTRIBUTE..NUM_KNOWN_OBJ_ATTRIBUTES-1 (this range
     is used in order to make unity easy).  The returned value is the
     actual tag number to place in the input position.  */
  int (*obj_attrs_order) (int);

  /* Handle merging unknown attributes; either warn and return TRUE,
     or give an error and return FALSE.  */
  bfd_boolean (*obj_attrs_handle_unknown) (bfd *, int);

  /* This is non-zero if static TLS segments require a special alignment.  */
  unsigned static_tls_alignment;

  /* Alignment for the PT_GNU_STACK segment. */
  unsigned stack_align;

  /* This is TRUE if the linker should act like collect and gather
     global constructors and destructors by name.  This is TRUE for
     MIPS ELF because the Irix 5 tools can not handle the .init
     section.  */
  unsigned collect : 1;

  /* This is TRUE if the linker should ignore changes to the type of a
     symbol.  This is TRUE for MIPS ELF because some Irix 5 objects
     record undefined functions as STT_OBJECT although the definitions
     are STT_FUNC.  */
  unsigned type_change_ok : 1;

  /* Whether the backend may use REL relocations.  (Some backends use
     both REL and RELA relocations, and this flag is set for those
     backends.)  */
  unsigned may_use_rel_p : 1;

  /* Whether the backend may use RELA relocations.  (Some backends use
     both REL and RELA relocations, and this flag is set for those
     backends.)  */
  unsigned may_use_rela_p : 1;

  /* Whether the default relocation type is RELA.  If a backend with
     this flag set wants REL relocations for a particular section,
     it must note that explicitly.  Similarly, if this flag is clear,
     and the backend wants RELA relocations for a particular
     section.  */
  unsigned default_use_rela_p : 1;

  /* True if PLT and copy relocations should be RELA by default.  */
  unsigned rela_plts_and_copies_p : 1;

  /* Set if RELA relocations for a relocatable link can be handled by
     generic code.  Backends that set this flag need do nothing in the
     backend relocate_section routine for relocatable linking.  */
  unsigned rela_normal : 1;

  /* TRUE if addresses "naturally" sign extend.  This is used when
     swapping in from Elf32 when BFD64.  */
  unsigned sign_extend_vma : 1;

  unsigned want_got_plt : 1;
  unsigned plt_readonly : 1;
  unsigned want_plt_sym : 1;
  unsigned plt_not_loaded : 1;
  unsigned plt_alignment : 4;
  unsigned can_gc_sections : 1;
  unsigned can_refcount : 1;
  unsigned want_got_sym : 1;
  unsigned want_dynbss : 1;

  /* Targets which do not support physical addressing often require
     that the p_paddr field in the section header to be set to zero.
     This field indicates whether this behavior is required.  */
  unsigned want_p_paddr_set_to_zero : 1;

  /* True if an object file lacking a .note.GNU-stack section
     should be assumed to be requesting exec stack.  At least one
     other file in the link needs to have a .note.GNU-stack section
     for a PT_GNU_STACK segment to be created.  */
  unsigned default_execstack : 1;
};

/* Information about reloc sections associated with a bfd_elf_section_data
   structure.  */
struct bfd_elf_section_reloc_data
{
  /* The ELF header for the reloc section associated with this
     section, if any.  */
  Elf_Internal_Shdr *hdr;
  /* The number of relocations currently assigned to HDR.  */
  unsigned int count;
  /* The ELF section number of the reloc section.  Only used for an
     output file.  */
  int idx;
  /* Used by the backend linker to store the symbol hash table entries
     associated with relocs against global symbols.  */
  struct elf_link_hash_entry **hashes;
};

/* Information stored for each BFD section in an ELF file.  This
   structure is allocated by elf_new_section_hook.  */

struct bfd_elf_section_data
{
  /* The ELF header for this section.  */
  Elf_Internal_Shdr this_hdr;

  /* INPUT_SECTION_FLAGS if specified in the linker script.  */
  struct flag_info *section_flag_info;

  /* Information about the REL and RELA reloc sections associated
     with this section, if any.  */
  struct bfd_elf_section_reloc_data rel, rela;

  /* The ELF section number of this section.  */
  int this_idx;

  /* Used by the backend linker when generating a shared library to
     record the dynamic symbol index for a section symbol
     corresponding to this section.  A value of 0 means that there is
     no dynamic symbol for this section.  */
  int dynindx;

  /* A pointer to the linked-to section for SHF_LINK_ORDER.  */
  asection *linked_to;

  /* A pointer to the swapped relocs.  If the section uses REL relocs,
     rather than RELA, all the r_addend fields will be zero.  This
     pointer may be NULL.  It is used by the backend linker.  */
  Elf_Internal_Rela *relocs;

  /* A pointer to a linked list tracking dynamic relocs copied for
     local symbols.  */
  void *local_dynrel;

  /* A pointer to the bfd section used for dynamic relocs.  */
  asection *sreloc;

  union {
    /* Group name, if this section is a member of a group.  */
    const char *name;

    /* Group signature sym, if this is the SHT_GROUP section.  */
    struct bfd_symbol *id;
  } group;

  /* For a member of a group, points to the SHT_GROUP section.
     NULL for the SHT_GROUP section itself and non-group sections.  */
  asection *sec_group;

  /* A linked list of member sections in the group.  Circular when used by
     the linker.  For the SHT_GROUP section, points at first member.  */
  asection *next_in_group;

  /* The FDEs associated with this section.  The u.fde.next_in_section
     field acts as a chain pointer.  */
  struct eh_cie_fde *fde_list;

  /* A pointer used for various section optimizations.  */
  void *sec_info;
};

#define elf_section_data(sec) ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
#define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
#define elf_section_type(sec)	(elf_section_data(sec)->this_hdr.sh_type)
#define elf_section_flags(sec)	(elf_section_data(sec)->this_hdr.sh_flags)
#define elf_group_name(sec)	(elf_section_data(sec)->group.name)
#define elf_group_id(sec)	(elf_section_data(sec)->group.id)
#define elf_next_in_group(sec)	(elf_section_data(sec)->next_in_group)
#define elf_fde_list(sec)	(elf_section_data(sec)->fde_list)
#define elf_sec_group(sec)	(elf_section_data(sec)->sec_group)

#define xvec_get_elf_backend_data(xvec) \
  ((const struct elf_backend_data *) (xvec)->backend_data)

#define get_elf_backend_data(abfd) \
   xvec_get_elf_backend_data ((abfd)->xvec)

/* The least object attributes (within an attributes subsection) known
   for any target.  Some code assumes that the value 0 is not used and
   the field for that attribute can instead be used as a marker to
   indicate that attributes have been initialized.  */
#define LEAST_KNOWN_OBJ_ATTRIBUTE 2

/* The maximum number of known object attributes for any target.  */
#define NUM_KNOWN_OBJ_ATTRIBUTES 71

/* The value of an object attribute.  The type indicates whether the attribute
   holds and integer, a string, or both.  It can also indicate that there can
   be no default (i.e. all values must be written to file, even zero).  */

typedef struct obj_attribute
{
#define ATTR_TYPE_FLAG_INT_VAL    (1 << 0)
#define ATTR_TYPE_FLAG_STR_VAL    (1 << 1)
#define ATTR_TYPE_FLAG_NO_DEFAULT (1 << 2)

#define ATTR_TYPE_HAS_INT_VAL(TYPE)	((TYPE) & ATTR_TYPE_FLAG_INT_VAL)
#define ATTR_TYPE_HAS_STR_VAL(TYPE)	((TYPE) & ATTR_TYPE_FLAG_STR_VAL)
#define ATTR_TYPE_HAS_NO_DEFAULT(TYPE)	((TYPE) & ATTR_TYPE_FLAG_NO_DEFAULT)

  int type;
  unsigned int i;
  char *s;
} obj_attribute;

typedef struct obj_attribute_list
{
  struct obj_attribute_list *next;
  int tag;
  obj_attribute attr;
} obj_attribute_list;

/* Object attributes may either be defined by the processor ABI, index
   OBJ_ATTR_PROC in the *_obj_attributes arrays, or be GNU-specific
   (and possibly also processor-specific), index OBJ_ATTR_GNU.  */
#define OBJ_ATTR_PROC 0
#define OBJ_ATTR_GNU 1
#define OBJ_ATTR_FIRST OBJ_ATTR_PROC
#define OBJ_ATTR_LAST OBJ_ATTR_GNU

/* The following object attribute tags are taken as generic, for all
   targets and for "gnu" where there is no target standard.  */
enum
{
  Tag_NULL = 0,
  Tag_File = 1,
  Tag_Section = 2,
  Tag_Symbol = 3,
  Tag_compatibility = 32
};

/* The following struct stores information about every SystemTap section
   found in the object file.  */
struct sdt_note
{
  struct sdt_note *next;
  bfd_size_type size;
  bfd_byte data[1];
};

/* Some private data is stashed away for future use using the tdata pointer
   in the bfd structure.  */

struct elf_obj_tdata
{
  Elf_Internal_Ehdr elf_header[1];	/* Actual data, but ref like ptr */
  Elf_Internal_Shdr **elf_sect_ptr;
  Elf_Internal_Phdr *phdr;
  struct elf_segment_map *segment_map;
  struct elf_strtab_hash *strtab_ptr;
  int num_locals;
  int num_globals;
  unsigned int num_elf_sections;	/* elf_sect_ptr size */
  int num_section_syms;
  asymbol **section_syms;		/* STT_SECTION symbols for each section */
  Elf_Internal_Shdr symtab_hdr;
  Elf_Internal_Shdr shstrtab_hdr;
  Elf_Internal_Shdr strtab_hdr;
  Elf_Internal_Shdr dynsymtab_hdr;
  Elf_Internal_Shdr dynstrtab_hdr;
  Elf_Internal_Shdr dynversym_hdr;
  Elf_Internal_Shdr dynverref_hdr;
  Elf_Internal_Shdr dynverdef_hdr;
  Elf_Internal_Shdr symtab_shndx_hdr;
  unsigned int symtab_section, shstrtab_section;
  unsigned int strtab_section, dynsymtab_section;
  unsigned int symtab_shndx_section;
  unsigned int dynversym_section, dynverdef_section, dynverref_section;
  file_ptr next_file_pos;
  bfd_vma gp;				/* The gp value */
  unsigned int gp_size;			/* The gp size */

  /* Information grabbed from an elf core file.  */
  int core_signal;
  int core_pid;
  int core_lwpid;
  char* core_program;
  char* core_command;

  /* A mapping from external symbols to entries in the linker hash
     table, used when linking.  This is indexed by the symbol index
     minus the sh_info field of the symbol table header.  */
  struct elf_link_hash_entry **sym_hashes;

  /* Track usage and final offsets of GOT entries for local symbols.
     This array is indexed by symbol index.  Elements are used
     identically to "got" in struct elf_link_hash_entry.  */
  union
    {
      bfd_signed_vma *refcounts;
      bfd_vma *offsets;
      struct got_entry **ents;
    } local_got;

  /* The linker ELF emulation code needs to let the backend ELF linker
     know what filename should be used for a dynamic object if the
     dynamic object is found using a search.  The emulation code then
     sometimes needs to know what name was actually used.  Until the
     file has been added to the linker symbol table, this field holds
     the name the linker wants.  After it has been added, it holds the
     name actually used, which will be the DT_SONAME entry if there is
     one.  */
  const char *dt_name;

  /* The linker emulation needs to know what audit libs
     are used by a dynamic object.  */
  const char *dt_audit;

  /* Records the result of `get_program_header_size'.  */
  bfd_size_type program_header_size;

  /* Used by find_nearest_line entry point.  */
  void *line_info;

  /* Used by MIPS ELF find_nearest_line entry point.  The structure
     could be included directly in this one, but there's no point to
     wasting the memory just for the infrequently called
     find_nearest_line.  */
  struct mips_elf_find_line *find_line_info;

  /* A place to stash dwarf1 info for this bfd.  */
  struct dwarf1_debug *dwarf1_find_line_info;

  /* A place to stash dwarf2 info for this bfd.  */
  void *dwarf2_find_line_info;

  /* An array of stub sections indexed by symbol number, used by the
     MIPS ELF linker.  FIXME: We should figure out some way to only
     include this field for a MIPS ELF target.  */
  asection **local_stubs;
  asection **local_call_stubs;

  /* Used to determine if PT_GNU_EH_FRAME segment header should be
     created.  */
  asection *eh_frame_hdr;

  Elf_Internal_Shdr **group_sect_ptr;
  int num_group;

  /* Number of symbol version definitions we are about to emit.  */
  unsigned int cverdefs;

  /* Number of symbol version references we are about to emit.  */
  unsigned int cverrefs;

  /* Segment flags for the PT_GNU_STACK segment.  */
  unsigned int stack_flags;

  /* Symbol version definitions in external objects.  */
  Elf_Internal_Verdef *verdef;

  /* Symbol version references to external objects.  */
  Elf_Internal_Verneed *verref;

  /* The Irix 5 support uses two virtual sections, which represent
     text/data symbols defined in dynamic objects.  */
  asymbol *elf_data_symbol;
  asymbol *elf_text_symbol;
  asection *elf_data_section;
  asection *elf_text_section;

  /* A pointer to the .eh_frame section.  */
  asection *eh_frame_section;

  /* Whether a dyanmic object was specified normally on the linker
     command line, or was specified when --as-needed was in effect,
     or was found via a DT_NEEDED entry.  */
  enum dynamic_lib_link_class dyn_lib_class;

  /* This is set to TRUE if the object was created by the backend
     linker.  */
  bfd_boolean linker;

  /* Irix 5 often screws up the symbol table, sorting local symbols
     after global symbols.  This flag is set if the symbol table in
     this BFD appears to be screwed up.  If it is, we ignore the
     sh_info field in the symbol table header, and always read all the
     symbols.  */
  bfd_boolean bad_symtab;

  /* Used to determine if the e_flags field has been initialized */
  bfd_boolean flags_init;

  /* Symbol buffer.  */
  void *symbuf;

  obj_attribute known_obj_attributes[2][NUM_KNOWN_OBJ_ATTRIBUTES];
  obj_attribute_list *other_obj_attributes[2];

  /* Called at the end of _bfd_elf_write_object_contents if not NULL.  */
  bfd_boolean (*after_write_object_contents) (bfd *);
  void *after_write_object_contents_info;

  /* NT_GNU_BUILD_ID note type.  */
  bfd_size_type build_id_size;
  bfd_byte *build_id;

  /* Linked-list containing information about every Systemtap section
     found in the object file.  Each section corresponds to one entry
     in the list.  */
  struct sdt_note *sdt_note_head;

  /* True if the bfd contains symbols that have the STT_GNU_IFUNC
     symbol type or STB_GNU_UNIQUE binding.  Used to set the osabi
     field in the ELF header structure.  */
  bfd_boolean has_gnu_symbols;

  /* An identifier used to distinguish different target
     specific extensions to this structure.  */
  enum elf_target_id object_id;
};

#define elf_tdata(bfd)		((bfd) -> tdata.elf_obj_data)

#define elf_object_id(bfd)	(elf_tdata(bfd) -> object_id)
#define elf_program_header_size(bfd) (elf_tdata(bfd) -> program_header_size)
#define elf_elfheader(bfd)	(elf_tdata(bfd) -> elf_header)
#define elf_elfsections(bfd)	(elf_tdata(bfd) -> elf_sect_ptr)
#define elf_numsections(bfd)	(elf_tdata(bfd) -> num_elf_sections)
#define elf_shstrtab(bfd)	(elf_tdata(bfd) -> strtab_ptr)
#define elf_onesymtab(bfd)	(elf_tdata(bfd) -> symtab_section)
#define elf_symtab_shndx(bfd)	(elf_tdata(bfd) -> symtab_shndx_section)
#define elf_symtab_hdr(bfd)	(elf_tdata(bfd) -> symtab_hdr)
#define elf_dynsymtab(bfd)	(elf_tdata(bfd) -> dynsymtab_section)
#define elf_dynversym(bfd)	(elf_tdata(bfd) -> dynversym_section)
#define elf_dynverdef(bfd)	(elf_tdata(bfd) -> dynverdef_section)
#define elf_dynverref(bfd)	(elf_tdata(bfd) -> dynverref_section)
#define elf_eh_frame_section(bfd) \
				(elf_tdata(bfd) -> eh_frame_section)
#define elf_num_locals(bfd)	(elf_tdata(bfd) -> num_locals)
#define elf_num_globals(bfd)	(elf_tdata(bfd) -> num_globals)
#define elf_section_syms(bfd)	(elf_tdata(bfd) -> section_syms)
#define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
#define core_prpsinfo(bfd)	(elf_tdata(bfd) -> prpsinfo)
#define core_prstatus(bfd)	(elf_tdata(bfd) -> prstatus)
#define elf_gp(bfd)		(elf_tdata(bfd) -> gp)
#define elf_gp_size(bfd)	(elf_tdata(bfd) -> gp_size)
#define elf_sym_hashes(bfd)	(elf_tdata(bfd) -> sym_hashes)
#define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
#define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
#define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
#define elf_dt_name(bfd)	(elf_tdata(bfd) -> dt_name)
#define elf_dt_audit(bfd)	(elf_tdata(bfd) -> dt_audit)
#define elf_dyn_lib_class(bfd)	(elf_tdata(bfd) -> dyn_lib_class)
#define elf_bad_symtab(bfd)	(elf_tdata(bfd) -> bad_symtab)
#define elf_flags_init(bfd)	(elf_tdata(bfd) -> flags_init)
#define elf_known_obj_attributes(bfd) (elf_tdata (bfd) -> known_obj_attributes)
#define elf_other_obj_attributes(bfd) (elf_tdata (bfd) -> other_obj_attributes)
#define elf_known_obj_attributes_proc(bfd) \
  (elf_known_obj_attributes (bfd) [OBJ_ATTR_PROC])
#define elf_other_obj_attributes_proc(bfd) \
  (elf_other_obj_attributes (bfd) [OBJ_ATTR_PROC])

extern void _bfd_elf_swap_verdef_in
  (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
extern void _bfd_elf_swap_verdef_out
  (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
extern void _bfd_elf_swap_verdaux_in
  (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
extern void _bfd_elf_swap_verdaux_out
  (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
extern void _bfd_elf_swap_verneed_in
  (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
extern void _bfd_elf_swap_verneed_out
  (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
extern void _bfd_elf_swap_vernaux_in
  (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
extern void _bfd_elf_swap_vernaux_out
  (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
extern void _bfd_elf_swap_versym_in
  (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
extern void _bfd_elf_swap_versym_out
  (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);

extern unsigned int _bfd_elf_section_from_bfd_section
  (bfd *, asection *);
extern char *bfd_elf_string_from_elf_section
  (bfd *, unsigned, unsigned);
extern Elf_Internal_Sym *bfd_elf_get_elf_syms
  (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
   Elf_External_Sym_Shndx *);
extern const char *bfd_elf_sym_name
  (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);

extern bfd_boolean _bfd_elf_copy_private_bfd_data
  (bfd *, bfd *);
extern bfd_boolean _bfd_elf_print_private_bfd_data
  (bfd *, void *);
extern void bfd_elf_print_symbol
  (bfd *, void *, asymbol *, bfd_print_symbol_type);

extern unsigned int _bfd_elf_eh_frame_address_size
  (bfd *, asection *);
extern bfd_byte _bfd_elf_encode_eh_address
  (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
   asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
extern bfd_boolean _bfd_elf_can_make_relative
  (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);

extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
  (const Elf_Internal_Rela *);
extern bfd_vma _bfd_elf_rela_local_sym
  (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
extern bfd_vma _bfd_elf_rel_local_sym
  (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
extern bfd_vma _bfd_elf_section_offset
  (bfd *, struct bfd_link_info *, asection *, bfd_vma);

extern unsigned long bfd_elf_hash
  (const char *);
extern unsigned long bfd_elf_gnu_hash
  (const char *);

extern bfd_reloc_status_type bfd_elf_generic_reloc
  (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
extern bfd_boolean bfd_elf_allocate_object
  (bfd *, size_t, enum elf_target_id);
extern bfd_boolean bfd_elf_make_object
  (bfd *);
extern bfd_boolean bfd_elf_mkcorefile
  (bfd *);
extern bfd_boolean _bfd_elf_make_section_from_shdr
  (bfd *, Elf_Internal_Shdr *, const char *, int);
extern bfd_boolean _bfd_elf_make_section_from_phdr
  (bfd *, Elf_Internal_Phdr *, int, const char *);
extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
  (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
  (bfd *);
extern void _bfd_elf_link_hash_copy_indirect
  (struct bfd_link_info *, struct elf_link_hash_entry *,
   struct elf_link_hash_entry *);
extern void _bfd_elf_link_hash_hide_symbol
  (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
  (struct bfd_link_info *, struct elf_link_hash_entry *);
extern bfd_boolean _bfd_elf_link_hash_table_init
  (struct elf_link_hash_table *, bfd *,
   struct bfd_hash_entry *(*)
     (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
   unsigned int, enum elf_target_id);
extern bfd_boolean _bfd_elf_slurp_version_tables
  (bfd *, bfd_boolean);
extern bfd_boolean _bfd_elf_merge_sections
  (bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_match_sections_by_type
  (bfd *, const asection *, bfd *, const asection *);
extern bfd_boolean bfd_elf_is_group_section
  (bfd *, const struct bfd_section *);
extern bfd_boolean _bfd_elf_section_already_linked
  (bfd *, asection *, struct bfd_link_info *);
extern void bfd_elf_set_group_contents
  (bfd *, asection *, void *);
extern asection *_bfd_elf_check_kept_section
  (asection *, struct bfd_link_info *);
#define _bfd_elf_link_just_syms _bfd_generic_link_just_syms
extern void _bfd_elf_copy_link_hash_symbol_type
  (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *);
extern bfd_boolean _bfd_elf_size_group_sections
  (struct bfd_link_info *);
extern bfd_boolean _bfd_elf_fixup_group_sections
(bfd *, asection *);
extern bfd_boolean _bfd_elf_copy_private_header_data
  (bfd *, bfd *);
extern bfd_boolean _bfd_elf_copy_private_symbol_data
  (bfd *, asymbol *, bfd *, asymbol *);
#define _bfd_generic_init_private_section_data \
  _bfd_elf_init_private_section_data
extern bfd_boolean _bfd_elf_init_private_section_data
  (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_copy_private_section_data
  (bfd *, asection *, bfd *, asection *);
extern bfd_boolean _bfd_elf_write_object_contents
  (bfd *);
extern bfd_boolean _bfd_elf_write_corefile_contents
  (bfd *);
extern bfd_boolean _bfd_elf_set_section_contents
  (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
extern long _bfd_elf_get_symtab_upper_bound
  (bfd *);
extern long _bfd_elf_canonicalize_symtab
  (bfd *, asymbol **);
extern long _bfd_elf_get_dynamic_symtab_upper_bound
  (bfd *);
extern long _bfd_elf_canonicalize_dynamic_symtab
  (bfd *, asymbol **);
extern long _bfd_elf_get_synthetic_symtab
  (bfd *, long, asymbol **, long, asymbol **, asymbol **);
extern long _bfd_elf_get_reloc_upper_bound
  (bfd *, sec_ptr);
extern long _bfd_elf_canonicalize_reloc
  (bfd *, sec_ptr, arelent **, asymbol **);
extern asection * _bfd_elf_get_dynamic_reloc_section
  (bfd *, asection *, bfd_boolean);
extern asection * _bfd_elf_make_dynamic_reloc_section
  (asection *, bfd *, unsigned int, bfd *, bfd_boolean);
extern long _bfd_elf_get_dynamic_reloc_upper_bound
  (bfd *);
extern long _bfd_elf_canonicalize_dynamic_reloc
  (bfd *, arelent **, asymbol **);
extern asymbol *_bfd_elf_make_empty_symbol
  (bfd *);
extern void _bfd_elf_get_symbol_info
  (bfd *, asymbol *, symbol_info *);
extern bfd_boolean _bfd_elf_is_local_label_name
  (bfd *, const char *);
extern alent *_bfd_elf_get_lineno
  (bfd *, asymbol *);
extern bfd_boolean _bfd_elf_set_arch_mach
  (bfd *, enum bfd_architecture, unsigned long);
extern bfd_boolean _bfd_elf_find_nearest_line
  (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
   unsigned int *);
extern bfd_boolean _bfd_elf_find_nearest_line_discriminator
  (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
   unsigned int *, unsigned int *);
extern bfd_boolean _bfd_elf_find_line
  (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
extern bfd_boolean _bfd_elf_find_line_discriminator
  (bfd *, asymbol **, asymbol *, const char **, unsigned int *, unsigned int *);
#define _bfd_generic_find_line _bfd_elf_find_line
#define _bfd_generic_find_nearest_line_discriminator \
        _bfd_elf_find_nearest_line_discriminator
extern bfd_boolean _bfd_elf_find_inliner_info
  (bfd *, const char **, const char **, unsigned int *);
#define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
#define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
extern int _bfd_elf_sizeof_headers
  (bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_new_section_hook
  (bfd *, asection *);
extern bfd_boolean _bfd_elf_init_reloc_shdr
  (bfd *, struct bfd_elf_section_reloc_data *, asection *, bfd_boolean);
extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
  (const char *, const struct bfd_elf_special_section *, unsigned int);
extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
  (bfd *, asection *);

/* If the target doesn't have reloc handling written yet:  */
extern void _bfd_elf_no_info_to_howto
  (bfd *, arelent *, Elf_Internal_Rela *);

extern bfd_boolean bfd_section_from_shdr
  (bfd *, unsigned int shindex);
extern bfd_boolean bfd_section_from_phdr
  (bfd *, Elf_Internal_Phdr *, int);

extern int _bfd_elf_symbol_from_bfd_symbol
  (bfd *, asymbol **);

extern Elf_Internal_Sym *bfd_sym_from_r_symndx
  (struct sym_cache *, bfd *, unsigned long);
extern asection *bfd_section_from_elf_index
  (bfd *, unsigned int);
extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
  (void);

extern struct elf_strtab_hash * _bfd_elf_strtab_init
  (void);
extern void _bfd_elf_strtab_free
  (struct elf_strtab_hash *);
extern bfd_size_type _bfd_elf_strtab_add
  (struct elf_strtab_hash *, const char *, bfd_boolean);
extern void _bfd_elf_strtab_addref
  (struct elf_strtab_hash *, bfd_size_type);
extern void _bfd_elf_strtab_delref
  (struct elf_strtab_hash *, bfd_size_type);
extern unsigned int _bfd_elf_strtab_refcount
  (struct elf_strtab_hash *, bfd_size_type);
extern void _bfd_elf_strtab_clear_refs
  (struct elf_strtab_hash *, bfd_size_type);
#define _bfd_elf_strtab_clear_all_refs(tab) \
  do { _bfd_elf_strtab_clear_refs (tab, 1); } while (0)
extern bfd_size_type _bfd_elf_strtab_size
  (struct elf_strtab_hash *);
extern bfd_size_type _bfd_elf_strtab_offset
  (struct elf_strtab_hash *, bfd_size_type);
extern bfd_boolean _bfd_elf_strtab_emit
  (bfd *, struct elf_strtab_hash *);
extern void _bfd_elf_strtab_finalize
  (struct elf_strtab_hash *);

extern void _bfd_elf_begin_eh_frame_parsing
  (struct bfd_link_info *info);
extern void _bfd_elf_parse_eh_frame
  (bfd *, struct bfd_link_info *, asection *, struct elf_reloc_cookie *);
extern void _bfd_elf_end_eh_frame_parsing
  (struct bfd_link_info *info);

extern bfd_boolean _bfd_elf_discard_section_eh_frame
  (bfd *, struct bfd_link_info *, asection *,
   bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
  (bfd *, struct bfd_link_info *);
extern bfd_vma _bfd_elf_eh_frame_section_offset
  (bfd *, struct bfd_link_info *, asection *, bfd_vma);
extern bfd_boolean _bfd_elf_write_section_eh_frame
  (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
  (bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_eh_frame_present
  (struct bfd_link_info *);
extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
  (struct bfd_link_info *);

extern bfd_boolean _bfd_elf_merge_symbol
  (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
   asection **, bfd_vma *, bfd_boolean *, unsigned int *,
   struct elf_link_hash_entry **, bfd_boolean *,
   bfd_boolean *, bfd_boolean *, bfd_boolean *);

extern bfd_boolean _bfd_elf_hash_symbol (struct elf_link_hash_entry *);

extern long _bfd_elf_link_lookup_local_dynindx
  (struct bfd_link_info *, bfd *, long);
extern bfd_boolean _bfd_elf_compute_section_file_positions
  (bfd *, struct bfd_link_info *);
extern void _bfd_elf_assign_file_positions_for_relocs
  (bfd *);
extern file_ptr _bfd_elf_assign_file_position_for_section
  (Elf_Internal_Shdr *, file_ptr, bfd_boolean);

extern bfd_boolean _bfd_elf_validate_reloc
  (bfd *, arelent *);

extern bfd_boolean _bfd_elf_link_create_dynamic_sections
  (bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_link_omit_section_dynsym
  (bfd *, struct bfd_link_info *, asection *);
extern bfd_boolean _bfd_elf_create_dynamic_sections
  (bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_create_got_section
  (bfd *, struct bfd_link_info *);
extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
  (bfd *, struct bfd_link_info *, asection *, const char *);
extern void _bfd_elf_init_1_index_section
  (bfd *, struct bfd_link_info *);
extern void _bfd_elf_init_2_index_sections
  (bfd *, struct bfd_link_info *);

extern bfd_boolean _bfd_elfcore_make_pseudosection
  (bfd *, char *, size_t, ufile_ptr);
extern char *_bfd_elfcore_strndup
  (bfd *, char *, size_t);

extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
  (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);

extern bfd_boolean _bfd_elf_link_output_relocs
  (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
   struct elf_link_hash_entry **);

extern bfd_boolean _bfd_elf_adjust_dynamic_copy
  (struct elf_link_hash_entry *, asection *);

extern bfd_boolean _bfd_elf_dynamic_symbol_p
  (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);

extern bfd_boolean _bfd_elf_symbol_refs_local_p
  (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);

extern bfd_reloc_status_type bfd_elf_perform_complex_relocation
  (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma);

extern bfd_boolean _bfd_elf_setup_sections
  (bfd *);

extern void _bfd_elf_set_osabi (bfd * , struct bfd_link_info *);

extern const bfd_target *bfd_elf32_object_p
  (bfd *);
extern const bfd_target *bfd_elf32_core_file_p
  (bfd *);
extern char *bfd_elf32_core_file_failing_command
  (bfd *);
extern int bfd_elf32_core_file_failing_signal
  (bfd *);
extern bfd_boolean bfd_elf32_core_file_matches_executable_p
  (bfd *, bfd *);
extern int bfd_elf32_core_file_pid
  (bfd *);

extern bfd_boolean bfd_elf32_swap_symbol_in
  (bfd *, const void *, const void *, Elf_Internal_Sym *);
extern void bfd_elf32_swap_symbol_out
  (bfd *, const Elf_Internal_Sym *, void *, void *);
extern void bfd_elf32_swap_reloc_in
  (bfd *, const bfd_byte *, Elf_Internal_Rela *);
extern void bfd_elf32_swap_reloc_out
  (bfd *, const Elf_Internal_Rela *, bfd_byte *);
extern void bfd_elf32_swap_reloca_in
  (bfd *, const bfd_byte *, Elf_Internal_Rela *);
extern void bfd_elf32_swap_reloca_out
  (bfd *, const Elf_Internal_Rela *, bfd_byte *);
extern void bfd_elf32_swap_phdr_in
  (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
extern void bfd_elf32_swap_phdr_out
  (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
extern void bfd_elf32_swap_dyn_in
  (bfd *, const void *, Elf_Internal_Dyn *);
extern void bfd_elf32_swap_dyn_out
  (bfd *, const Elf_Internal_Dyn *, void *);
extern long bfd_elf32_slurp_symbol_table
  (bfd *, asymbol **, bfd_boolean);
extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
  (bfd *);
extern int bfd_elf32_write_out_phdrs
  (bfd *, const Elf_Internal_Phdr *, unsigned int);
extern bfd_boolean bfd_elf32_checksum_contents
  (bfd * , void (*) (const void *, size_t, void *), void *);
extern void bfd_elf32_write_relocs
  (bfd *, asection *, void *);
extern bfd_boolean bfd_elf32_slurp_reloc_table
  (bfd *, asection *, asymbol **, bfd_boolean);

extern const bfd_target *bfd_elf64_object_p
  (bfd *);
extern const bfd_target *bfd_elf64_core_file_p
  (bfd *);
extern char *bfd_elf64_core_file_failing_command
  (bfd *);
extern int bfd_elf64_core_file_failing_signal
  (bfd *);
extern bfd_boolean bfd_elf64_core_file_matches_executable_p
  (bfd *, bfd *);
extern int bfd_elf64_core_file_pid
  (bfd *);

extern bfd_boolean bfd_elf64_swap_symbol_in
  (bfd *, const void *, const void *, Elf_Internal_Sym *);
extern void bfd_elf64_swap_symbol_out
  (bfd *, const Elf_Internal_Sym *, void *, void *);
extern void bfd_elf64_swap_reloc_in
  (bfd *, const bfd_byte *, Elf_Internal_Rela *);
extern void bfd_elf64_swap_reloc_out
  (bfd *, const Elf_Internal_Rela *, bfd_byte *);
extern void bfd_elf64_swap_reloca_in
  (bfd *, const bfd_byte *, Elf_Internal_Rela *);
extern void bfd_elf64_swap_reloca_out
  (bfd *, const Elf_Internal_Rela *, bfd_byte *);
extern void bfd_elf64_swap_phdr_in
  (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
extern void bfd_elf64_swap_phdr_out
  (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
extern void bfd_elf64_swap_dyn_in
  (bfd *, const void *, Elf_Internal_Dyn *);
extern void bfd_elf64_swap_dyn_out
  (bfd *, const Elf_Internal_Dyn *, void *);
extern long bfd_elf64_slurp_symbol_table
  (bfd *, asymbol **, bfd_boolean);
extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
  (bfd *);
extern int bfd_elf64_write_out_phdrs
  (bfd *, const Elf_Internal_Phdr *, unsigned int);
extern bfd_boolean bfd_elf64_checksum_contents
  (bfd * , void (*) (const void *, size_t, void *), void *);
extern void bfd_elf64_write_relocs
  (bfd *, asection *, void *);
extern bfd_boolean bfd_elf64_slurp_reloc_table
  (bfd *, asection *, asymbol **, bfd_boolean);

extern bfd_boolean _bfd_elf_default_relocs_compatible
  (const bfd_target *, const bfd_target *);

extern bfd_boolean _bfd_elf_relocs_compatible
  (const bfd_target *, const bfd_target *);

extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
  (bfd *, struct bfd_link_info *, const char *);
extern bfd_boolean bfd_elf_link_add_symbols
  (bfd *, struct bfd_link_info *);
extern bfd_boolean _bfd_elf_add_dynamic_entry
  (struct bfd_link_info *, bfd_vma, bfd_vma);

extern bfd_boolean bfd_elf_link_record_dynamic_symbol
  (struct bfd_link_info *, struct elf_link_hash_entry *);

extern int bfd_elf_link_record_local_dynamic_symbol
  (struct bfd_link_info *, bfd *, long);

extern bfd_boolean _bfd_elf_close_and_cleanup
  (bfd *);

extern bfd_boolean _bfd_elf_common_definition
  (Elf_Internal_Sym *);

extern unsigned int _bfd_elf_common_section_index
  (asection *);

extern asection *_bfd_elf_common_section
  (asection *);

extern bfd_vma _bfd_elf_default_got_elt_size
(bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, bfd *,
 unsigned long);

extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
  (bfd *, arelent *, struct bfd_symbol *, void *,
   asection *, bfd *, char **);

extern bfd_boolean bfd_elf_final_link
  (bfd *, struct bfd_link_info *);

extern void _bfd_elf_gc_keep
  (struct bfd_link_info *info);

extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
  (struct elf_link_hash_entry *h, void *inf);

extern bfd_boolean bfd_elf_gc_sections
  (bfd *, struct bfd_link_info *);

extern bfd_boolean bfd_elf_gc_record_vtinherit
  (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);

extern bfd_boolean bfd_elf_gc_record_vtentry
  (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);

extern asection *_bfd_elf_gc_mark_hook
  (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
   struct elf_link_hash_entry *, Elf_Internal_Sym *);

extern asection *_bfd_elf_gc_mark_rsec
  (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
   struct elf_reloc_cookie *);

extern bfd_boolean _bfd_elf_gc_mark_reloc
  (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn,
   struct elf_reloc_cookie *);

extern bfd_boolean _bfd_elf_gc_mark_fdes
  (struct bfd_link_info *, asection *, asection *, elf_gc_mark_hook_fn,
   struct elf_reloc_cookie *);

extern bfd_boolean _bfd_elf_gc_mark
  (struct bfd_link_info *, asection *, elf_gc_mark_hook_fn);

extern bfd_boolean _bfd_elf_gc_mark_extra_sections
  (struct bfd_link_info *, elf_gc_mark_hook_fn);

extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
  (bfd *, struct bfd_link_info *);

extern bfd_boolean bfd_elf_gc_common_final_link
  (bfd *, struct bfd_link_info *);

extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
  (bfd_vma, void *);

extern struct elf_segment_map * _bfd_elf_make_dynamic_segment
  (bfd *, asection *);

extern bfd_boolean _bfd_elf_map_sections_to_segments
  (bfd *, struct bfd_link_info *);

extern bfd_boolean _bfd_elf_is_function_type (unsigned int);

extern bfd_size_type _bfd_elf_maybe_function_sym (const asymbol *, asection *,
						  bfd_vma *);

extern int bfd_elf_get_default_section_type (flagword);

extern bfd_boolean bfd_elf_lookup_section_flags
  (struct bfd_link_info *, struct flag_info *, asection *);

extern Elf_Internal_Phdr * _bfd_elf_find_segment_containing_section
  (bfd * abfd, asection * section);

/* Exported interface for writing elf corefile notes. */
extern char *elfcore_write_note
  (bfd *, char *, int *, const char *, int, const void *, int);
extern char *elfcore_write_prpsinfo
  (bfd *, char *, int *, const char *, const char *);
extern char *elfcore_write_prstatus
  (bfd *, char *, int *, long, int, const void *);
extern char * elfcore_write_pstatus
  (bfd *, char *, int *, long, int, const void *);
extern char *elfcore_write_prfpreg
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_prxfpreg
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_xstatereg
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_ppc_vmx
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_ppc_vsx
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_timer
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_todcmp
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_todpreg
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_ctrs
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_prefix
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_last_break
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_s390_system_call
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_arm_vfp
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_aarch_tls
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_aarch_hw_break
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_aarch_hw_watch
  (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_lwpstatus
  (bfd *, char *, int *, long, int, const void *);
extern char *elfcore_write_register_note
  (bfd *, char *, int *, const char *, const void *, int);

extern bfd *_bfd_elf32_bfd_from_remote_memory
  (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
   int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));
extern bfd *_bfd_elf64_bfd_from_remote_memory
  (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
   int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type));

extern bfd_vma bfd_elf_obj_attr_size (bfd *);
extern void bfd_elf_set_obj_attr_contents (bfd *, bfd_byte *, bfd_vma);
extern int bfd_elf_get_obj_attr_int (bfd *, int, int);
extern void bfd_elf_add_obj_attr_int (bfd *, int, int, unsigned int);
#define bfd_elf_add_proc_attr_int(BFD, TAG, VALUE) \
  bfd_elf_add_obj_attr_int ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
extern void bfd_elf_add_obj_attr_string (bfd *, int, int, const char *);
#define bfd_elf_add_proc_attr_string(BFD, TAG, VALUE) \
  bfd_elf_add_obj_attr_string ((BFD), OBJ_ATTR_PROC, (TAG), (VALUE))
extern void bfd_elf_add_obj_attr_int_string (bfd *, int, int, unsigned int,
					     const char *);
#define bfd_elf_add_proc_attr_int_string(BFD, TAG, INTVAL, STRVAL) \
  bfd_elf_add_obj_attr_int_string ((BFD), OBJ_ATTR_PROC, (TAG), \
				   (INTVAL), (STRVAL))

extern char *_bfd_elf_attr_strdup (bfd *, const char *);
extern void _bfd_elf_copy_obj_attributes (bfd *, bfd *);
extern int _bfd_elf_obj_attrs_arg_type (bfd *, int, int);
extern void _bfd_elf_parse_attributes (bfd *, Elf_Internal_Shdr *);
extern bfd_boolean _bfd_elf_merge_object_attributes (bfd *, bfd *);
extern bfd_boolean _bfd_elf_merge_unknown_attribute_low (bfd *, bfd *, int);
extern bfd_boolean _bfd_elf_merge_unknown_attribute_list (bfd *, bfd *);
extern Elf_Internal_Shdr *_bfd_elf_single_rel_hdr (asection *sec);

/* The linker may need to keep track of the number of relocs that it
   decides to copy as dynamic relocs in check_relocs for each symbol.
   This is so that it can later discard them if they are found to be
   unnecessary.  We can store the information in a field extending the
   regular ELF linker hash table.  */

struct elf_dyn_relocs
{
  struct elf_dyn_relocs *next;

  /* The input section of the reloc.  */
  asection *sec;

  /* Total number of relocs copied for the input section.  */
  bfd_size_type count;

  /* Number of pc-relative relocs copied for the input section.  */
  bfd_size_type pc_count;
};

extern bfd_boolean _bfd_elf_create_ifunc_sections
  (bfd *, struct bfd_link_info *);
extern asection * _bfd_elf_create_ifunc_dyn_reloc
  (bfd *, struct bfd_link_info *, asection *sec, asection *sreloc,
   struct elf_dyn_relocs **);
extern bfd_boolean _bfd_elf_allocate_ifunc_dyn_relocs
  (struct bfd_link_info *, struct elf_link_hash_entry *,
   struct elf_dyn_relocs **, unsigned int, unsigned int);

extern void elf_append_rela (bfd *, asection *, Elf_Internal_Rela *);
extern void elf_append_rel (bfd *, asection *, Elf_Internal_Rela *);

extern bfd_vma elf64_r_info (bfd_vma, bfd_vma);
extern bfd_vma elf64_r_sym (bfd_vma);
extern bfd_vma elf32_r_info (bfd_vma, bfd_vma);
extern bfd_vma elf32_r_sym (bfd_vma);

/* Large common section.  */
extern asection _bfd_elf_large_com_section;

/* Hash for local symbol with the first section id, ID, in the input
   file and the local symbol index, SYM.  */
#define ELF_LOCAL_SYMBOL_HASH(ID, SYM) \
  (((((ID) & 0xff) << 24) | (((ID) & 0xff00) << 8)) \
   ^ (SYM) ^ ((ID) >> 16))

/* This is the condition under which finish_dynamic_symbol will be called.
   If our finish_dynamic_symbol isn't called, we'll need to do something
   about initializing any .plt and .got entries in relocate_section.  */
#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
  ((DYN)								\
   && ((SHARED) || !(H)->forced_local)					\
   && ((H)->dynindx != -1 || (H)->forced_local))

/* This macro is to avoid lots of duplicated code in the body
   of xxx_relocate_section() in the various elfxx-xxxx.c files.  */
#define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,	\
				r_symndx, symtab_hdr, sym_hashes,	\
				h, sec, relocation,			\
				unresolved_reloc, warned)		\
  do									\
    {									\
      /* It seems this can happen with erroneous or unsupported		\
	 input (mixing a.out and elf in an archive, for example.)  */	\
      if (sym_hashes == NULL)						\
	return FALSE;							\
									\
      h = sym_hashes[r_symndx - symtab_hdr->sh_info];			\
									\
      while (h->root.type == bfd_link_hash_indirect			\
	     || h->root.type == bfd_link_hash_warning)			\
	h = (struct elf_link_hash_entry *) h->root.u.i.link;		\
									\
      warned = FALSE;							\
      unresolved_reloc = FALSE;						\
      relocation = 0;							\
      if (h->root.type == bfd_link_hash_defined				\
	  || h->root.type == bfd_link_hash_defweak)			\
	{								\
	  sec = h->root.u.def.section;					\
	  if (sec == NULL						\
	      || sec->output_section == NULL)				\
	    /* Set a flag that will be cleared later if we find a	\
	       relocation value for this symbol.  output_section	\
	       is typically NULL for symbols satisfied by a shared	\
	       library.  */						\
	    unresolved_reloc = TRUE;					\
	  else								\
	    relocation = (h->root.u.def.value				\
			  + sec->output_section->vma			\
			  + sec->output_offset);			\
	}								\
      else if (h->root.type == bfd_link_hash_undefweak)			\
	;								\
      else if (info->unresolved_syms_in_objects == RM_IGNORE		\
	       && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)		\
	;								\
      else if (!info->relocatable)					\
	{								\
	  bfd_boolean err;						\
	  err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR	\
		 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT);	\
	  if (!info->callbacks->undefined_symbol (info,			\
						  h->root.root.string,	\
						  input_bfd,		\
						  input_section,	\
						  rel->r_offset, err))	\
	    return FALSE;						\
	  warned = TRUE;						\
	}								\
      (void) unresolved_reloc;						\
      (void) warned;							\
    }									\
  while (0)

/* This macro is to avoid lots of duplicated code in the body of the
   loop over relocations in xxx_relocate_section() in the various
   elfxx-xxxx.c files.

   Handle relocations against symbols from removed linkonce sections,
   or sections discarded by a linker script.  When doing a relocatable
   link, we remove such relocations.  Otherwise, we just want the
   section contents zeroed and avoid any special processing.  */
#define RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section,	\
					rel, count, relend,		\
					howto, index, contents)		\
  {									\
    int i_;								\
    _bfd_clear_contents (howto, input_bfd, input_section,		\
			 contents + rel[index].r_offset);		\
									\
    if (info->relocatable						\
	&& (input_section->flags & SEC_DEBUGGING))			\
      {									\
	/* Only remove relocations in debug sections since other	\
	   sections may require relocations.  */			\
	Elf_Internal_Shdr *rel_hdr;					\
									\
	rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \
									\
	/* Avoid empty output section.  */				\
	if (rel_hdr->sh_size > count * rel_hdr->sh_entsize)		\
	  {								\
	    rel_hdr->sh_size -= count * rel_hdr->sh_entsize;		\
	    rel_hdr = _bfd_elf_single_rel_hdr (input_section);		\
	    rel_hdr->sh_size -= count * rel_hdr->sh_entsize;		\
									\
	    memmove (rel, rel + count,					\
		     (relend - rel - count) * sizeof (*rel));		\
									\
	    input_section->reloc_count -= count;			\
	    relend -= count;						\
	    rel--;							\
	    continue;							\
	  }								\
      }									\
									\
    for (i_ = 0; i_ < count; i_++)					\
      {									\
	rel[i_].r_info = 0;						\
	rel[i_].r_addend = 0;						\
      }									\
    rel += count - 1;							\
    continue;								\
  }

/* Will a symbol be bound to the definition within the shared
   library, if any.  A unique symbol can never be bound locally.  */
#define SYMBOLIC_BIND(INFO, H) \
    (!(H)->unique_global \
     && ((INFO)->symbolic || ((INFO)->dynamic && !(H)->dynamic)))

#endif /* _LIBELF_H_ */