summaryrefslogtreecommitdiff
path: root/bfd/elf64-x86-64.c
blob: 4bbbb0871ead7bdd9677af621757aceebf3e96ad (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
/* X86-64 specific support for 64-bit ELF
   Copyright 2000, 2001 Free Software Foundation, Inc.
   Contributed by Jan Hubicka <jh@suse.cz>.

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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

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

#include "elf/x86-64.h"

/* We use only the RELA entries.  */
#define USE_RELA

/* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
#define MINUS_ONE (~ (bfd_vma) 0)

/* The relocation "howto" table.  Order of fields:
   type, size, bitsize, pc_relative, complain_on_overflow,
   special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset.  */
static reloc_howto_type x86_64_elf_howto_table[] =
{
  HOWTO(R_X86_64_NONE, 0, 0, 0, false, 0, complain_overflow_dont,
	bfd_elf_generic_reloc, "R_X86_64_NONE",	false, 0x00000000, 0x00000000,
	false),
  HOWTO(R_X86_64_64, 0, 4, 64, false, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_64", false, MINUS_ONE, MINUS_ONE,
	false),
  HOWTO(R_X86_64_PC32, 0, 4, 32, true, 0, complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0xffffffff, 0xffffffff,
	true),
  HOWTO(R_X86_64_GOT32, 0, 4, 32, false, 0, complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0xffffffff, 0xffffffff,
	false),
  HOWTO(R_X86_64_PLT32, 0, 4, 32, true, 0, complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0xffffffff, 0xffffffff,
	true),
  HOWTO(R_X86_64_COPY, 0, 4, 32, false, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_COPY", false, 0xffffffff, 0xffffffff,
	false),
  HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", false, MINUS_ONE,
	MINUS_ONE, false),
  HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", false, MINUS_ONE,
	MINUS_ONE, false),
  HOWTO(R_X86_64_RELATIVE, 0, 4, 64, false, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_RELATIVE", false, MINUS_ONE,
	MINUS_ONE, false),
  HOWTO(R_X86_64_GOTPCREL, 0, 4, 32, true,0 , complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0xffffffff,
	0xffffffff, true),
  HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_unsigned,
	bfd_elf_generic_reloc, "R_X86_64_32", false, 0xffffffff, 0xffffffff,
	false),
  HOWTO(R_X86_64_32S, 0, 4, 32, false, 0, complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_32S", false, 0xffffffff, 0xffffffff,
	false),
  HOWTO(R_X86_64_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_16", false, 0xffff, 0xffff, false),
  HOWTO(R_X86_64_PC16,0, 1, 16, true, 0, complain_overflow_bitfield,
	bfd_elf_generic_reloc, "R_X86_64_PC16", false, 0xffff, 0xffff, true),
  HOWTO(R_X86_64_8, 0, 0, 8, false, 0, complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_8", false, 0xff, 0xff, false),
  HOWTO(R_X86_64_PC8, 0, 0, 8, true, 0, complain_overflow_signed,
	bfd_elf_generic_reloc, "R_X86_64_PC8", false, 0xff, 0xff, true),

/* GNU extension to record C++ vtable hierarchy.  */
  HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, false, 0, complain_overflow_dont,
	 NULL, "R_X86_64_GNU_VTINHERIT", false, 0, 0, false),

/* GNU extension to record C++ vtable member usage.  */
  HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, false, 0, complain_overflow_dont,
	 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", false, 0, 0,
	 false)
};

/* Map BFD relocs to the x86_64 elf relocs.  */
struct elf_reloc_map
{
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned char elf_reloc_val;
};

static const struct elf_reloc_map x86_64_reloc_map[] =
{
  { BFD_RELOC_NONE,		R_X86_64_NONE, },
  { BFD_RELOC_64,		R_X86_64_64,   },
  { BFD_RELOC_32_PCREL,		R_X86_64_PC32, },
  { BFD_RELOC_X86_64_GOT32,	R_X86_64_GOT32,},
  { BFD_RELOC_X86_64_PLT32,	R_X86_64_PLT32,},
  { BFD_RELOC_X86_64_COPY,	R_X86_64_COPY, },
  { BFD_RELOC_X86_64_GLOB_DAT,	R_X86_64_GLOB_DAT, },
  { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
  { BFD_RELOC_X86_64_RELATIVE,	R_X86_64_RELATIVE, },
  { BFD_RELOC_X86_64_GOTPCREL,	R_X86_64_GOTPCREL, },
  { BFD_RELOC_32,		R_X86_64_32, },
  { BFD_RELOC_X86_64_32S,	R_X86_64_32S, },
  { BFD_RELOC_16,		R_X86_64_16, },
  { BFD_RELOC_16_PCREL,		R_X86_64_PC16, },
  { BFD_RELOC_8,		R_X86_64_8, },
  { BFD_RELOC_8_PCREL,		R_X86_64_PC8, },
  { BFD_RELOC_VTABLE_INHERIT,	R_X86_64_GNU_VTINHERIT, },
  { BFD_RELOC_VTABLE_ENTRY,	R_X86_64_GNU_VTENTRY, },
};

static reloc_howto_type *elf64_x86_64_reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));
static void elf64_x86_64_info_to_howto
  PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
  PARAMS ((bfd *));
static boolean elf64_x86_64_elf_object_p PARAMS ((bfd *abfd));
static boolean elf64_x86_64_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *sec,
	   const Elf_Internal_Rela *));
static asection *elf64_x86_64_gc_mark_hook
  PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
	   struct elf_link_hash_entry *, Elf_Internal_Sym *));

static boolean elf64_x86_64_gc_sweep_hook
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
	   const Elf_Internal_Rela *));

static struct bfd_hash_entry *elf64_x86_64_link_hash_newfunc
  PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
static boolean elf64_x86_64_adjust_dynamic_symbol
  PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));

static boolean elf64_x86_64_size_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf64_x86_64_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
	 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static boolean elf64_x86_64_finish_dynamic_symbol
  PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
	   Elf_Internal_Sym *sym));
static boolean elf64_x86_64_finish_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));
static enum elf_reloc_type_class elf64_x86_64_reloc_type_class
  PARAMS ((const Elf_Internal_Rela *));

/* Given a BFD reloc type, return a HOWTO structure.  */
static reloc_howto_type *
elf64_x86_64_reloc_type_lookup (abfd, code)
     bfd *abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  unsigned int i;
  for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
       i++)
    {
      if (x86_64_reloc_map[i].bfd_reloc_val == code)
	return &x86_64_elf_howto_table[i];
    }
  return 0;
}

/* Given an x86_64 ELF reloc type, fill in an arelent structure.  */

static void
elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
     bfd *abfd ATTRIBUTE_UNUSED;
     arelent *cache_ptr;
     Elf64_Internal_Rela *dst;
{
  unsigned r_type, i;

  r_type = ELF64_R_TYPE (dst->r_info);
  if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT)
    {
      BFD_ASSERT (r_type <= (unsigned int) R_X86_64_PC8);
      i = r_type;
    }
  else
    {
      BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
      i = r_type - ((unsigned int) R_X86_64_GNU_VTINHERIT - R_X86_64_PC8 - 1);
    }
  cache_ptr->howto = &x86_64_elf_howto_table[i];
  BFD_ASSERT (r_type == cache_ptr->howto->type);
}

/* Functions for the x86-64 ELF linker.	 */

/* The name of the dynamic interpreter.	 This is put in the .interp
   section.  */

#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"

/* The size in bytes of an entry in the global offset table.  */

#define GOT_ENTRY_SIZE 8

/* The size in bytes of an entry in the procedure linkage table.  */

#define PLT_ENTRY_SIZE 16

/* The first entry in a procedure linkage table looks like this.  See the
   SVR4 ABI i386 supplement and the x86-64 ABI to see how this works.  */

static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
{
  0xff, 0x35, 8, 0, 0, 0,	/* pushq GOT+8(%rip)  */
  0xff, 0x25, 16, 0, 0, 0,	/* jmpq *GOT+16(%rip) */
  0x90, 0x90, 0x90, 0x90	/* pad out to 16 bytes with nops.  */
};

/* Subsequent entries in a procedure linkage table look like this.  */

static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
{
  0xff, 0x25,	/* jmpq *name@GOTPC(%rip) */
  0, 0, 0, 0,	/* replaced with offset to this symbol in .got.	 */
  0x68,		/* pushq immediate */
  0, 0, 0, 0,	/* replaced with index into relocation table.  */
  0xe9,		/* jmp relative */
  0, 0, 0, 0	/* replaced with offset to start of .plt0.  */
};

/* The x86-64 linker needs to keep track of the number of relocs that
   it decides to copy in check_relocs for each symbol.	This is so
   that it can discard PC relative relocs if it doesn't need them when
   linking with -Bsymbolic.  We store the information in a field
   extending the regular ELF linker hash table.	 */

/* This structure keeps track of the number of PC relative relocs we
   have copied for a given symbol.  */

struct elf64_x86_64_pcrel_relocs_copied
{
  /* Next section.  */
  struct elf64_x86_64_pcrel_relocs_copied *next;
  /* A section in dynobj.  */
  asection *section;
  /* Number of relocs copied in this section.  */
  bfd_size_type count;
};

/* x86-64 ELF linker hash entry.  */

struct elf64_x86_64_link_hash_entry
{
  struct elf_link_hash_entry root;

  /* Number of PC relative relocs copied for this symbol.  */
  struct elf64_x86_64_pcrel_relocs_copied *pcrel_relocs_copied;
};

/* x86-64  ELF linker hash table.  */

struct elf64_x86_64_link_hash_table
{
  struct elf_link_hash_table root;
};

/* Declare this now that the above structures are defined.  */

static boolean elf64_x86_64_discard_copies
  PARAMS ((struct elf64_x86_64_link_hash_entry *, PTR));

/* Traverse an x86-64 ELF linker hash table.  */

#define elf64_x86_64_link_hash_traverse(table, func, info)		\
  (elf_link_hash_traverse						\
   (&(table)->root,							\
    (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func),	\
    (info)))

/* Get the x86-64 ELF linker hash table from a link_info structure.  */

#define elf64_x86_64_hash_table(p) \
  ((struct elf64_x86_64_link_hash_table *) ((p)->hash))

/* Create an entry in an x86-64 ELF linker hash table.	*/

static struct bfd_hash_entry *
elf64_x86_64_link_hash_newfunc (entry, table, string)
     struct bfd_hash_entry *entry;
     struct bfd_hash_table *table;
     const char *string;
{
  struct elf64_x86_64_link_hash_entry *ret =
    (struct elf64_x86_64_link_hash_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     subclass.	*/
  if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
    ret = ((struct elf64_x86_64_link_hash_entry *)
	   bfd_hash_allocate (table,
			      sizeof (struct elf64_x86_64_link_hash_entry)));
  if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
    return (struct bfd_hash_entry *) ret;

  /* Call the allocation method of the superclass.  */
  ret = ((struct elf64_x86_64_link_hash_entry *)
	 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
				     table, string));
  if (ret != (struct elf64_x86_64_link_hash_entry *) NULL)
    {
      ret->pcrel_relocs_copied = NULL;
    }

  return (struct bfd_hash_entry *) ret;
}

/* Create an X86-64 ELF linker hash table.  */

static struct bfd_link_hash_table *
elf64_x86_64_link_hash_table_create (abfd)
     bfd *abfd;
{
  struct elf64_x86_64_link_hash_table *ret;
  bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);

  ret = ((struct elf64_x86_64_link_hash_table *) bfd_alloc (abfd, amt));
  if (ret == (struct elf64_x86_64_link_hash_table *) NULL)
    return NULL;

  if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
				       elf64_x86_64_link_hash_newfunc))
    {
      bfd_release (abfd, ret);
      return NULL;
    }

  return &ret->root.root;
}

static boolean
elf64_x86_64_elf_object_p (abfd)
     bfd *abfd;
{
  /* Set the right machine number for an x86-64 elf64 file.  */
  bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
  return true;
}

/* Look through the relocs for a section during the first phase, and
   allocate space in the global offset table or procedure linkage
   table.  */

static boolean
elf64_x86_64_check_relocs (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  bfd *dynobj;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_signed_vma *local_got_refcounts;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;
  asection *sgot;
  asection *srelgot;
  asection *sreloc;

  if (info->relocateable)
    return true;

  dynobj = elf_hash_table (info)->dynobj;
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  local_got_refcounts = elf_local_got_refcounts (abfd);

  sgot = srelgot = sreloc = NULL;
  rel_end = relocs + sec->reloc_count;
  for (rel = relocs; rel < rel_end; rel++)
    {
      unsigned long r_symndx;
      struct elf_link_hash_entry *h;

      r_symndx = ELF64_R_SYM (rel->r_info);
      if (r_symndx < symtab_hdr->sh_info)
	h = NULL;
      else
	h = sym_hashes[r_symndx - symtab_hdr->sh_info];

      /* Some relocs require a global offset table.  */
      if (dynobj == NULL)
	{
	  switch (ELF64_R_TYPE (rel->r_info))
	    {
	    case R_X86_64_GOT32:
	    case R_X86_64_GOTPCREL:
	      elf_hash_table (info)->dynobj = dynobj = abfd;
	      if (! _bfd_elf_create_got_section (dynobj, info))
		return false;
	      break;
	    }
	}

      switch (ELF64_R_TYPE (rel->r_info))
	{
	case R_X86_64_GOTPCREL:
	case R_X86_64_GOT32:
	  /* This symbol requires a global offset table entry.	*/

	  if (sgot == NULL)
	    {
	      sgot = bfd_get_section_by_name (dynobj, ".got");
	      BFD_ASSERT (sgot != NULL);
	    }

	  if (srelgot == NULL && (h != NULL || info->shared))
	    {
	      srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
	      if (srelgot == NULL)
		{
		  srelgot = bfd_make_section (dynobj, ".rela.got");
		  if (srelgot == NULL
		      || ! bfd_set_section_flags (dynobj, srelgot,
						  (SEC_ALLOC
						   | SEC_LOAD
						   | SEC_HAS_CONTENTS
						   | SEC_IN_MEMORY
						   | SEC_LINKER_CREATED
						   | SEC_READONLY))
		      || ! bfd_set_section_alignment (dynobj, srelgot, 3))
		    return false;
		}
	    }

	  if (h != NULL)
	    {
	      if (h->got.refcount == 0)
		{
		  /* Make sure this symbol is output as a dynamic symbol.  */
		  if (h->dynindx == -1)
		    {
		      if (! bfd_elf64_link_record_dynamic_symbol (info, h))
			return false;
		    }

		  sgot->_raw_size += GOT_ENTRY_SIZE;
		  srelgot->_raw_size += sizeof (Elf64_External_Rela);
		}
	      h->got.refcount += 1;
	    }
	  else
	    {
	      /* This is a global offset table entry for a local symbol.  */
	      if (local_got_refcounts == NULL)
		{
		  bfd_size_type size;

		  size = symtab_hdr->sh_info;
		  size *= sizeof (bfd_signed_vma);
		  local_got_refcounts = ((bfd_signed_vma *)
					 bfd_zalloc (abfd, size));
		  if (local_got_refcounts == NULL)
		    return false;
		  elf_local_got_refcounts (abfd) = local_got_refcounts;
		}
	      if (local_got_refcounts[r_symndx] == 0)
		{
		  sgot->_raw_size += GOT_ENTRY_SIZE;
		  if (info->shared)
		    {
		      /* If we are generating a shared object, we need to
			 output a R_X86_64_RELATIVE reloc so that the dynamic
			 linker can adjust this GOT entry.  */
		      srelgot->_raw_size += sizeof (Elf64_External_Rela);
		    }
		}
	      local_got_refcounts[r_symndx] += 1;
	    }
	  break;

	case R_X86_64_PLT32:
	  /* This symbol requires a procedure linkage table entry.  We
	     actually build the entry in adjust_dynamic_symbol,
	     because this might be a case of linking PIC code which is
	     never referenced by a dynamic object, in which case we
	     don't need to generate a procedure linkage table entry
	     after all.	 */

	  /* If this is a local symbol, we resolve it directly without
	     creating a procedure linkage table entry.	*/
	  if (h == NULL)
	    continue;

	  h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
	  h->plt.refcount += 1;
	  break;

	case R_X86_64_8:
	case R_X86_64_16:
	case R_X86_64_32:
	case R_X86_64_64:
	case R_X86_64_32S:
	case R_X86_64_PC32:
	  if (h != NULL)
	    h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;

	  /* If we are creating a shared library, and this is a reloc
	     against a global symbol, or a non PC relative reloc
	     against a local symbol, then we need to copy the reloc
	     into the shared library.  However, if we are linking with
	     -Bsymbolic, we do not need to copy a reloc against a
	     global symbol which is defined in an object we are
	     including in the link (i.e., DEF_REGULAR is set).	At
	     this point we have not seen all the input files, so it is
	     possible that DEF_REGULAR is not set now but will be set
	     later (it is never cleared).  We account for that
	     possibility below by storing information in the
	     pcrel_relocs_copied field of the hash table entry.
	     A similar situation occurs when creating shared libraries
	     and symbol visibility changes render the symbol local.  */
	  if (info->shared
	      && (sec->flags & SEC_ALLOC) != 0
	      && (((ELF64_R_TYPE (rel->r_info) != R_X86_64_PC8)
		  && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC16)
		  && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32))
		  || (h != NULL
		      && (! info->symbolic
			  || (h->elf_link_hash_flags
			      & ELF_LINK_HASH_DEF_REGULAR) == 0))))
	    {
	      /* When creating a shared object, we must copy these
		 reloc types into the output file.  We create a reloc
		 section in dynobj and make room for this reloc.  */
	      if (sreloc == NULL)
		{
		  const char *name;

		  name = (bfd_elf_string_from_elf_section
			  (abfd,
			   elf_elfheader (abfd)->e_shstrndx,
			   elf_section_data (sec)->rel_hdr.sh_name));
		  if (name == NULL)
		    return false;

		  BFD_ASSERT (strncmp (name, ".rela", 5) == 0
			      && strcmp (bfd_get_section_name (abfd, sec),
					 name + 5) == 0);

		  sreloc = bfd_get_section_by_name (dynobj, name);
		  if (sreloc == NULL)
		    {
		      flagword flags;

		      sreloc = bfd_make_section (dynobj, name);
		      flags = (SEC_HAS_CONTENTS | SEC_READONLY
			       | SEC_IN_MEMORY | SEC_LINKER_CREATED);
		      if ((sec->flags & SEC_ALLOC) != 0)
			flags |= SEC_ALLOC | SEC_LOAD;
		      if (sreloc == NULL
			  || ! bfd_set_section_flags (dynobj, sreloc, flags)
			  || ! bfd_set_section_alignment (dynobj, sreloc, 3))
			return false;
		    }
		  if (sec->flags & SEC_READONLY)
		    info->flags |= DF_TEXTREL;
		}

	      sreloc->_raw_size += sizeof (Elf64_External_Rela);

	      /* If this is a global symbol, we count the number of PC
		 relative relocations we have entered for this symbol,
		 so that we can discard them later as necessary.  Note
		 that this function is only called if we are using an
		 elf64_x86_64 linker hash table, which means that h is
		 really a pointer to an elf64_x86_64_link_hash_entry.  */
	      if (h != NULL
		  && ((ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8)
		      || (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16)
		      || (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)))
		{
		  struct elf64_x86_64_link_hash_entry *eh;
		  struct elf64_x86_64_pcrel_relocs_copied *p;

		  eh = (struct elf64_x86_64_link_hash_entry *) h;

		  for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
		    if (p->section == sreloc)
		      break;

		  if (p == NULL)
		    {
		      p = ((struct elf64_x86_64_pcrel_relocs_copied *)
			   bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
		      if (p == NULL)
			return false;
		      p->next = eh->pcrel_relocs_copied;
		      eh->pcrel_relocs_copied = p;
		      p->section = sreloc;
		      p->count = 0;
		    }

		  ++p->count;
		}
	    }
	  break;

	  /* This relocation describes the C++ object vtable hierarchy.
	     Reconstruct it for later use during GC.  */
	case R_X86_64_GNU_VTINHERIT:
	  if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
	    return false;
	  break;

	  /* This relocation describes which C++ vtable entries are actually
	     used.  Record for later use during GC.  */
	case R_X86_64_GNU_VTENTRY:
	  if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
	    return false;
	  break;
	}
    }

  return true;
}

/* Return the section that should be marked against GC for a given
   relocation.	*/

static asection *
elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym)
     bfd *abfd;
     struct bfd_link_info *info ATTRIBUTE_UNUSED;
     Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
     struct elf_link_hash_entry *h;
     Elf_Internal_Sym *sym;
{
  if (h != NULL)
    {
      switch (ELF64_R_TYPE (rel->r_info))
	{
	case R_X86_64_GNU_VTINHERIT:
	case R_X86_64_GNU_VTENTRY:
	  break;

	default:
	  switch (h->root.type)
	    {
	    case bfd_link_hash_defined:
	    case bfd_link_hash_defweak:
	      return h->root.u.def.section;

	    case bfd_link_hash_common:
	      return h->root.u.c.p->section;

	    default:
	      break;
	    }
	}
    }
  else
    {
      return bfd_section_from_elf_index (abfd, sym->st_shndx);
    }

  return NULL;
}

/* Update the got entry reference counts for the section being removed.	 */

static boolean
elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info ATTRIBUTE_UNUSED;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_signed_vma *local_got_refcounts;
  const Elf_Internal_Rela *rel, *relend;
  unsigned long r_symndx;
  struct elf_link_hash_entry *h;
  bfd *dynobj;
  asection *sgot;
  asection *srelgot;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  local_got_refcounts = elf_local_got_refcounts (abfd);

  dynobj = elf_hash_table (info)->dynobj;
  if (dynobj == NULL)
    return true;

  sgot = bfd_get_section_by_name (dynobj, ".got");
  srelgot = bfd_get_section_by_name (dynobj, ".rela.got");

  relend = relocs + sec->reloc_count;
  for (rel = relocs; rel < relend; rel++)
    switch (ELF64_R_TYPE (rel->r_info))
      {
      case R_X86_64_GOT32:
      case R_X86_64_GOTPCREL:
	r_symndx = ELF64_R_SYM (rel->r_info);
	if (r_symndx >= symtab_hdr->sh_info)
	  {
	    h = sym_hashes[r_symndx - symtab_hdr->sh_info];
	    if (h->got.refcount > 0)
	      {
		h->got.refcount -= 1;
		if (h->got.refcount == 0)
		  {
		    sgot->_raw_size -= GOT_ENTRY_SIZE;
		    srelgot->_raw_size -= sizeof (Elf64_External_Rela);
		  }
	      }
	  }
	else if (local_got_refcounts != NULL)
	  {
	    if (local_got_refcounts[r_symndx] > 0)
	      {
		local_got_refcounts[r_symndx] -= 1;
		if (local_got_refcounts[r_symndx] == 0)
		  {
		    sgot->_raw_size -= GOT_ENTRY_SIZE;
		    if (info->shared)
		      srelgot->_raw_size -= sizeof (Elf64_External_Rela);
		  }
	      }
	  }
	break;

      case R_X86_64_PLT32:
	r_symndx = ELF64_R_SYM (rel->r_info);
	if (r_symndx >= symtab_hdr->sh_info)
	  {
	    h = sym_hashes[r_symndx - symtab_hdr->sh_info];
	    if (h->plt.refcount > 0)
	      h->plt.refcount -= 1;
	  }
	break;

      default:
	break;
      }

  return true;
}

/* Adjust a symbol defined by a dynamic object and referenced by a
   regular object.  The current definition is in some section of the
   dynamic object, but we're not including those sections.  We have to
   change the definition to something the rest of the link can
   understand.	*/

static boolean
elf64_x86_64_adjust_dynamic_symbol (info, h)
     struct bfd_link_info *info;
     struct elf_link_hash_entry *h;
{
  bfd *dynobj;
  asection *s;
  unsigned int power_of_two;

  dynobj = elf_hash_table (info)->dynobj;

  /* Make sure we know what is going on here.  */
  BFD_ASSERT (dynobj != NULL
	      && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
		  || h->weakdef != NULL
		  || ((h->elf_link_hash_flags
		       & ELF_LINK_HASH_DEF_DYNAMIC) != 0
		      && (h->elf_link_hash_flags
			  & ELF_LINK_HASH_REF_REGULAR) != 0
		      && (h->elf_link_hash_flags
			  & ELF_LINK_HASH_DEF_REGULAR) == 0)));

  /* If this is a function, put it in the procedure linkage table.  We
     will fill in the contents of the procedure linkage table later,
     when we know the address of the .got section.  */
  if (h->type == STT_FUNC
      || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
    {
      if ((! info->shared
	   && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
	   && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
	  || (info->shared && h->plt.refcount <= 0))
	{
	  /* This case can occur if we saw a PLT32 reloc in an input
	     file, but the symbol was never referred to by a dynamic
	     object, or if all references were garbage collected.  In
	     such a case, we don't actually need to build a procedure
	     linkage table, and we can just do a PC32 reloc instead.  */
	  h->plt.offset = (bfd_vma) -1;
	  h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
	  return true;
	}

      /* Make sure this symbol is output as a dynamic symbol.  */
      if (h->dynindx == -1)
	{
	  if (! bfd_elf64_link_record_dynamic_symbol (info, h))
	    return false;
	}

      s = bfd_get_section_by_name (dynobj, ".plt");
      BFD_ASSERT (s != NULL);

      /* If this is the first .plt entry, make room for the special
	 first entry.  */
      if (s->_raw_size == 0)
	s->_raw_size = PLT_ENTRY_SIZE;

      /* If this symbol is not defined in a regular file, and we are
	 not generating a shared library, then set the symbol to this
	 location in the .plt.	This is required to make function
	 pointers compare as equal between the normal executable and
	 the shared library.  */
      if (! info->shared
	  && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
	{
	  h->root.u.def.section = s;
	  h->root.u.def.value = s->_raw_size;
	}

      h->plt.offset = s->_raw_size;

      /* Make room for this entry.  */
      s->_raw_size += PLT_ENTRY_SIZE;

      /* We also need to make an entry in the .got.plt section, which
	 will be placed in the .got section by the linker script.  */
      s = bfd_get_section_by_name (dynobj, ".got.plt");
      BFD_ASSERT (s != NULL);
      s->_raw_size += GOT_ENTRY_SIZE;

      /* We also need to make an entry in the .rela.plt section.  */
      s = bfd_get_section_by_name (dynobj, ".rela.plt");
      BFD_ASSERT (s != NULL);
      s->_raw_size += sizeof (Elf64_External_Rela);

      return true;
    }
  else
    h->plt.offset = (bfd_vma) -1;

  /* If this is a weak symbol, and there is a real definition, the
     processor independent code will have arranged for us to see the
     real definition first, and we can just use the same value.	 */
  if (h->weakdef != NULL)
    {
      BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
		  || h->weakdef->root.type == bfd_link_hash_defweak);
      h->root.u.def.section = h->weakdef->root.u.def.section;
      h->root.u.def.value = h->weakdef->root.u.def.value;
      return true;
    }

  /* This is a reference to a symbol defined by a dynamic object which
     is not a function.	 */

  /* If we are creating a shared library, we must presume that the
     only references to the symbol are via the global offset table.
     For such cases we need not do anything here; the relocations will
     be handled correctly by relocate_section.	*/
  if (info->shared)
    return true;

  /* If there are no references to this symbol that do not use the
     GOT, we don't need to generate a copy reloc.  */
  if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
    return true;

  /* We must allocate the symbol in our .dynbss section, which will
     become part of the .bss section of the executable.	 There will be
     an entry for this symbol in the .dynsym section.  The dynamic
     object will contain position independent code, so all references
     from the dynamic object to this symbol will go through the global
     offset table.  The dynamic linker will use the .dynsym entry to
     determine the address it must put in the global offset table, so
     both the dynamic object and the regular object will refer to the
     same memory location for the variable.  */

  s = bfd_get_section_by_name (dynobj, ".dynbss");
  BFD_ASSERT (s != NULL);

  /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
     to copy the initial value out of the dynamic object and into the
     runtime process image.  We need to remember the offset into the
     .rela.bss section we are going to use.  */
  if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
    {
      asection *srel;

      srel = bfd_get_section_by_name (dynobj, ".rela.bss");
      BFD_ASSERT (srel != NULL);
      srel->_raw_size += sizeof (Elf64_External_Rela);
      h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
    }

  /* We need to figure out the alignment required for this symbol.  I
     have no idea how ELF linkers handle this.	16-bytes is the size
     of the largest type that requires hard alignment -- long double.  */
  /* FIXME: This is VERY ugly. Should be fixed for all architectures using
     this construct.  */
  power_of_two = bfd_log2 (h->size);
  if (power_of_two > 4)
    power_of_two = 4;

  /* Apply the required alignment.  */
  s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
  if (power_of_two > bfd_get_section_alignment (dynobj, s))
    {
      if (! bfd_set_section_alignment (dynobj, s, power_of_two))
	return false;
    }

  /* Define the symbol as being at this point in the section.  */
  h->root.u.def.section = s;
  h->root.u.def.value = s->_raw_size;

  /* Increment the section size to make room for the symbol.  */
  s->_raw_size += h->size;

  return true;
}

/* Set the sizes of the dynamic sections.  */

static boolean
elf64_x86_64_size_dynamic_sections (output_bfd, info)
     bfd *output_bfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *s;
  boolean plt;
  boolean relocs;

  dynobj = elf_hash_table (info)->dynobj;
  BFD_ASSERT (dynobj != NULL);

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      /* Set the contents of the .interp section to the interpreter.  */
      if (! info->shared)
	{
	  s = bfd_get_section_by_name (dynobj, ".interp");
	  BFD_ASSERT (s != NULL);
	  s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
	  s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
	}
    }
  else
    {
      /* We may have created entries in the .rela.got section.
	 However, if we are not creating the dynamic sections, we will
	 not actually use these entries.  Reset the size of .rela.got,
	 which will cause it to get stripped from the output file
	 below.	 */
      s = bfd_get_section_by_name (dynobj, ".rela.got");
      if (s != NULL)
	s->_raw_size = 0;
    }

  /* If this is a -Bsymbolic shared link, then we need to discard all
     PC relative relocs against symbols defined in a regular object.
     We allocated space for them in the check_relocs routine, but we
     will not fill them in in the relocate_section routine.  */
  if (info->shared)
    elf64_x86_64_link_hash_traverse (elf64_x86_64_hash_table (info),
				     elf64_x86_64_discard_copies,
				     (PTR) info);

  /* The check_relocs and adjust_dynamic_symbol entry points have
     determined the sizes of the various dynamic sections.  Allocate
     memory for them.  */
  plt = relocs = false;
  for (s = dynobj->sections; s != NULL; s = s->next)
    {
      const char *name;
      boolean strip;

      if ((s->flags & SEC_LINKER_CREATED) == 0)
	continue;

      /* It's OK to base decisions on the section name, because none
	 of the dynobj section names depend upon the input files.  */
      name = bfd_get_section_name (dynobj, s);

      strip = false;
      if (strcmp (name, ".plt") == 0)
	{
	  if (s->_raw_size == 0)
	    {
	      /* Strip this section if we don't need it; see the
		 comment below.	 */
	      strip = true;
	    }
	  else
	    {
	      /* Remember whether there is a PLT.  */
	      plt = true;
	    }
	}
      else if (strncmp (name, ".rela", 5) == 0)
	{
	  if (s->_raw_size == 0)
	    {
	      /* If we don't need this section, strip it from the
		 output file.  This is mostly to handle .rela.bss and
		 .rela.plt.  We must create both sections in
		 create_dynamic_sections, because they must be created
		 before the linker maps input sections to output
		 sections.  The linker does that before
		 adjust_dynamic_symbol is called, and it is that
		 function which decides whether anything needs to go
		 into these sections.  */
	      strip = true;
	    }
	  else
	    {
	      if (strcmp (name, ".rela.plt") != 0)
		relocs = true;

	      /* We use the reloc_count field as a counter if we need
		 to copy relocs into the output file.  */
	      s->reloc_count = 0;
	    }
	}
      else if (strncmp (name, ".got", 4) != 0)
	{
	  /* It's not one of our sections, so don't allocate space.  */
	  continue;
	}

      if (strip)
	{
	  _bfd_strip_section_from_output (info, s);
	  continue;
	}

      /* Allocate memory for the section contents.  We use bfd_zalloc
	 here in case unused entries are not reclaimed before the
	 section's contents are written out.  This should not happen,
	 but this way if it does, we get a R_X86_64_NONE reloc instead
	 of garbage.  */
      s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
      if (s->contents == NULL && s->_raw_size != 0)
	return false;
    }

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      /* Add some entries to the .dynamic section.  We fill in the
	 values later, in elf64_x86_64_finish_dynamic_sections, but we
	 must add the entries now so that we get the correct size for
	 the .dynamic section.	The DT_DEBUG entry is filled in by the
	 dynamic linker and used by the debugger.  */
#define add_dynamic_entry(TAG, VAL) \
  bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))

      if (! info->shared)
	{
	  if (!add_dynamic_entry (DT_DEBUG, 0))
	    return false;
	}

      if (plt)
	{
	  if (!add_dynamic_entry (DT_PLTGOT, 0)
	      || !add_dynamic_entry (DT_PLTRELSZ, 0)
	      || !add_dynamic_entry (DT_PLTREL, DT_RELA)
	      || !add_dynamic_entry (DT_JMPREL, 0))
	    return false;
	}

      if (relocs)
	{
	  if (!add_dynamic_entry (DT_RELA, 0)
	      || !add_dynamic_entry (DT_RELASZ, 0)
	      || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
	    return false;
	}

      if ((info->flags & DF_TEXTREL) != 0)
	{
	  if (!add_dynamic_entry (DT_TEXTREL, 0))
	    return false;
	}
    }
#undef add_dynamic_entry

  return true;
}

/* This function is called via elf64_x86_64_link_hash_traverse if we are
   creating a shared object.  In the -Bsymbolic case, it discards the
   space allocated to copy PC relative relocs against symbols which
   are defined in regular objects.  For the normal non-symbolic case,
   we also discard space for relocs that have become local due to
   symbol visibility changes.  We allocated space for them in the
   check_relocs routine, but we won't fill them in in the
   relocate_section routine.  */

static boolean
elf64_x86_64_discard_copies (h, inf)
     struct elf64_x86_64_link_hash_entry *h;
     PTR inf;
{
  struct elf64_x86_64_pcrel_relocs_copied *s;
  struct bfd_link_info *info = (struct bfd_link_info *) inf;

  /* If a symbol has been forced local or we have found a regular
     definition for the symbolic link case, then we won't be needing
     any relocs.  */
  if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
      && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
	  || info->symbolic))
    {
      for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
	s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
    }

  return true;
}

/* Relocate an x86_64 ELF section.  */

static boolean
elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
			       contents, relocs, local_syms, local_sections)
     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;
{
  bfd *dynobj;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_vma *local_got_offsets;
  asection *sgot;
  asection *splt;
  asection *sreloc;
  Elf_Internal_Rela *rela;
  Elf_Internal_Rela *relend;

  dynobj = elf_hash_table (info)->dynobj;
  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  local_got_offsets = elf_local_got_offsets (input_bfd);

  sreloc = splt = sgot = NULL;
  if (dynobj != NULL)
    {
      splt = bfd_get_section_by_name (dynobj, ".plt");
      sgot = bfd_get_section_by_name (dynobj, ".got");
    }

  rela = relocs;
  relend = relocs + input_section->reloc_count;
  for (; rela < relend; rela++)
    {
      int r_type;
      reloc_howto_type *howto;
      unsigned long r_symndx;
      struct elf_link_hash_entry *h;
      Elf_Internal_Sym *sym;
      asection *sec;
      bfd_vma relocation;
      bfd_reloc_status_type r;
      unsigned int indx;

      r_type = ELF64_R_TYPE (rela->r_info);
      if (r_type == (int) R_X86_64_GNU_VTINHERIT
	  || r_type == (int) R_X86_64_GNU_VTENTRY)
	continue;

      if ((indx = (unsigned) r_type) >= R_X86_64_max)
	{
	  bfd_set_error (bfd_error_bad_value);
	  return false;
	}
      howto = x86_64_elf_howto_table + indx;

      r_symndx = ELF64_R_SYM (rela->r_info);

      if (info->relocateable)
	{
	  /* This is a relocateable link.  We don't have to change
	     anything, unless the reloc is against a section symbol,
	     in which case we have to adjust according to where the
	     section symbol winds up in the output section.  */
	  if (r_symndx < symtab_hdr->sh_info)
	    {
	      sym = local_syms + r_symndx;
	      if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
		{
		  sec = local_sections[r_symndx];
		  rela->r_addend += sec->output_offset + sym->st_value;
		}
	    }

	  continue;
	}

      /* This is a final link.	*/
      h = NULL;
      sym = NULL;
      sec = NULL;
      if (r_symndx < symtab_hdr->sh_info)
	{
	  sym = local_syms + r_symndx;
	  sec = local_sections[r_symndx];
	  relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rela);
	}
      else
	{
	  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;
	  if (h->root.type == bfd_link_hash_defined
	      || h->root.type == bfd_link_hash_defweak)
	    {
	      sec = h->root.u.def.section;
	      if ((r_type == R_X86_64_PLT32
		   && splt != NULL
		   && h->plt.offset != (bfd_vma) -1)
		  || ((r_type == R_X86_64_GOT32 || r_type == R_X86_64_GOTPCREL)
		      && elf_hash_table (info)->dynamic_sections_created
		      && (!info->shared
			  || (! info->symbolic && h->dynindx != -1)
			  || (h->elf_link_hash_flags
			      & ELF_LINK_HASH_DEF_REGULAR) == 0))
		  || (info->shared
		      && ((! info->symbolic && h->dynindx != -1)
			  || (h->elf_link_hash_flags
			      & ELF_LINK_HASH_DEF_REGULAR) == 0)
		      && (r_type == R_X86_64_8
			  || r_type == R_X86_64_16
			  || r_type == R_X86_64_32
			  || r_type == R_X86_64_64
			  || r_type == R_X86_64_PC8
			  || r_type == R_X86_64_PC16
			  || r_type == R_X86_64_PC32)
                      && ((input_section->flags & SEC_ALLOC) != 0
                          /* DWARF will emit R_X86_64_32 relocations in its
                             sections against symbols defined externally
                             in shared libraries.  We can't do anything
                             with them here.  */
                          || ((input_section->flags & SEC_DEBUGGING) != 0
			      && (h->elf_link_hash_flags
				  & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
		{
		  /* In these cases, we don't need the relocation
                     value.  We check specially because in some
                     obscure cases sec->output_section will be NULL.  */
		  relocation = 0;
		}
	      else if (sec->output_section == NULL)
		{
		  (*_bfd_error_handler)
		    (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
		     bfd_archive_filename (input_bfd), h->root.root.string,
		     bfd_get_section_name (input_bfd, input_section));
		  relocation = 0;
		}
	      else
		relocation = (h->root.u.def.value
			      + sec->output_section->vma
			      + sec->output_offset);
	    }
	  else if (h->root.type == bfd_link_hash_undefweak)
	    relocation = 0;
	  else if (info->shared
		   && (!info->symbolic || info->allow_shlib_undefined)
		   && !info->no_undefined
		   && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
	    relocation = 0;
	  else
	    {
	      if (! ((*info->callbacks->undefined_symbol)
		     (info, h->root.root.string, input_bfd,
		      input_section, rela->r_offset,
		      (!info->shared || info->no_undefined
		       || ELF_ST_VISIBILITY (h->other)))))
		return false;
	      relocation = 0;
	    }
	}

      /* When generating a shared object, the relocations handled here are
	 copied into the output file to be resolved at run time.  */
      switch (r_type)
	{
	case R_X86_64_GOT32:
	  /* Relocation is to the entry for this symbol in the global
	     offset table.  */
	case R_X86_64_GOTPCREL:
	  /* Use global offset table as symbol value.  */
	  BFD_ASSERT (sgot != NULL);

	  if (h != NULL)
	    {
	      bfd_vma off = h->got.offset;
	      BFD_ASSERT (off != (bfd_vma) -1);

	      if (! elf_hash_table (info)->dynamic_sections_created
		  || (info->shared
		      && (info->symbolic || h->dynindx == -1)
		      && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
		{
		  /* This is actually a static link, or it is a -Bsymbolic
		     link and the symbol is defined locally, or the symbol
		     was forced to be local because of a version file.	We
		     must initialize this entry in the global offset table.
		     Since the offset must always be a multiple of 8, we
		     use the least significant bit to record whether we
		     have initialized it already.

		     When doing a dynamic link, we create a .rela.got
		     relocation entry to initialize the value.	This is
		     done in the finish_dynamic_symbol routine.	 */
		  if ((off & 1) != 0)
		    off &= ~1;
		  else
		    {
		      bfd_put_64 (output_bfd, relocation,
				  sgot->contents + off);
		      h->got.offset |= 1;
		    }
		}
	      if (r_type == R_X86_64_GOTPCREL)
		relocation = sgot->output_section->vma + sgot->output_offset + off;
	      else
		relocation = sgot->output_offset + off;
	    }
	  else
	    {
	      bfd_vma off;

	      BFD_ASSERT (local_got_offsets != NULL
			  && local_got_offsets[r_symndx] != (bfd_vma) -1);

	      off = local_got_offsets[r_symndx];

	      /* The offset must always be a multiple of 8.  We use
		 the least significant bit to record whether we have
		 already generated the necessary reloc.	 */
	      if ((off & 1) != 0)
		off &= ~1;
	      else
		{
		  bfd_put_64 (output_bfd, relocation, sgot->contents + off);

		  if (info->shared)
		    {
		      asection *srelgot;
		      Elf_Internal_Rela outrel;

		      /* We need to generate a R_X86_64_RELATIVE reloc
			 for the dynamic linker.  */
		      srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
		      BFD_ASSERT (srelgot != NULL);

		      outrel.r_offset = (sgot->output_section->vma
					 + sgot->output_offset
					 + off);
		      outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
		      outrel.r_addend = relocation;
		      bfd_elf64_swap_reloca_out (output_bfd, &outrel,
						 (((Elf64_External_Rela *)
						   srelgot->contents)
						  + srelgot->reloc_count));
		      ++srelgot->reloc_count;
		    }

		  local_got_offsets[r_symndx] |= 1;
		}

	      if (r_type == R_X86_64_GOTPCREL)
		relocation = sgot->output_section->vma + sgot->output_offset + off;
	      else
		relocation = sgot->output_offset + off;
	    }

	  break;

	case R_X86_64_PLT32:
	  /* Relocation is to the entry for this symbol in the
	     procedure linkage table.  */

	  /* Resolve a PLT32 reloc against a local symbol directly,
	     without using the procedure linkage table.	 */
	  if (h == NULL)
	    break;

	  if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
	    {
	      /* We didn't make a PLT entry for this symbol.  This
		 happens when statically linking PIC code, or when
		 using -Bsymbolic.  */
	      break;
	    }

	  relocation = (splt->output_section->vma
			+ splt->output_offset
			+ h->plt.offset);
	  break;

	case R_X86_64_PC8:
	case R_X86_64_PC16:
	case R_X86_64_PC32:
	  if (h == NULL || h->dynindx == -1
	      || (info->symbolic
		  && h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
	    break;
	  /* Fall through.  */
	case R_X86_64_8:
	case R_X86_64_16:
	case R_X86_64_32:
	case R_X86_64_64:
	  /* FIXME: The ABI says the linker should make sure the value is
	     the same when it's zeroextended to 64 bit.	 */
	  if (info->shared
	      && r_symndx != 0
	      && (input_section->flags & SEC_ALLOC) != 0)
	    {
	      Elf_Internal_Rela outrel;
	      boolean skip, relocate;

	      /* When generating a shared object, these relocations
		 are copied into the output file to be resolved at run
		 time.	*/

	      if (sreloc == NULL)
		{
		  const char *name;

		  name = (bfd_elf_string_from_elf_section
			  (input_bfd,
			   elf_elfheader (input_bfd)->e_shstrndx,
			   elf_section_data (input_section)->rel_hdr.sh_name));
		  if (name == NULL)
		    return false;

		  BFD_ASSERT (strncmp (name, ".rela", 5) == 0
			      && strcmp (bfd_get_section_name (input_bfd,
							       input_section),
					 name + 5) == 0);

		  sreloc = bfd_get_section_by_name (dynobj, name);
		  BFD_ASSERT (sreloc != NULL);
		}

	      skip = false;

	      outrel.r_offset =
		_bfd_elf_section_offset (output_bfd, info, input_section,
					 rela->r_offset);
	      if (outrel.r_offset == (bfd_vma) -1)
		skip = true;

	      outrel.r_offset += (input_section->output_section->vma
				  + input_section->output_offset);

	      if (skip)
		{
		  memset (&outrel, 0, sizeof outrel);
		  relocate = false;
		}
	      /* h->dynindx may be -1 if this symbol was marked to
		 become local.  */
	      else if (h != NULL
		       && ((! info->symbolic && h->dynindx != -1)
			   || (h->elf_link_hash_flags
			       & ELF_LINK_HASH_DEF_REGULAR) == 0))
		{
		  BFD_ASSERT (h->dynindx != -1);
		  relocate = false;
		  outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
		  outrel.r_addend = relocation + rela->r_addend;
		}
	      else
		{
		  if (r_type == R_X86_64_64)
		    {
		      relocate = true;
		      outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
		      outrel.r_addend = relocation + rela->r_addend;
		    }
		  else
		    {
		      long sindx;

		      if (h == NULL)
			sec = local_sections[r_symndx];
		      else
			{
			  BFD_ASSERT (h->root.type == bfd_link_hash_defined
				      || (h->root.type
					  == bfd_link_hash_defweak));
			  sec = h->root.u.def.section;
			}
		      if (sec != NULL && bfd_is_abs_section (sec))
			sindx = 0;
		      else if (sec == NULL || sec->owner == NULL)
			{
			  bfd_set_error (bfd_error_bad_value);
			  return false;
			}
		      else
			{
			  asection *osec;

			  osec = sec->output_section;
			  sindx = elf_section_data (osec)->dynindx;
			  BFD_ASSERT (sindx > 0);
			}

		      relocate = false;
		      outrel.r_info = ELF64_R_INFO (sindx, r_type);
		      outrel.r_addend = relocation + rela->r_addend;
		    }

		}

	      bfd_elf64_swap_reloca_out (output_bfd, &outrel,
					(((Elf64_External_Rela *)
					  sreloc->contents)
					 + sreloc->reloc_count));
	      ++sreloc->reloc_count;

	      /* If this reloc is against an external symbol, we do
		 not want to fiddle with the addend.  Otherwise, we
		 need to include the symbol value so that it becomes
		 an addend for the dynamic reloc.  */
	      if (! relocate)
		continue;
	    }

	  break;

	default:
	  break;
	}

      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
				    contents, rela->r_offset,
				    relocation, rela->r_addend);

      if (r != bfd_reloc_ok)
	{
	  switch (r)
	    {
	    default:
	    case bfd_reloc_outofrange:
	      abort ();
	    case bfd_reloc_overflow:
	      {
		const char *name;

		if (h != NULL)
		  name = h->root.root.string;
		else
		  {
		    name = bfd_elf_string_from_elf_section (input_bfd,
							    symtab_hdr->sh_link,
							    sym->st_name);
		    if (name == NULL)
		      return false;
		    if (*name == '\0')
		      name = bfd_section_name (input_bfd, sec);
		  }
		if (! ((*info->callbacks->reloc_overflow)
		       (info, name, howto->name, (bfd_vma) 0,
			input_bfd, input_section, rela->r_offset)))
		  return false;
	      }
	      break;
	    }
	}
    }

  return true;
}

/* Finish up dynamic symbol handling.  We set the contents of various
   dynamic sections here.  */

static boolean
elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym)
     bfd *output_bfd;
     struct bfd_link_info *info;
     struct elf_link_hash_entry *h;
     Elf_Internal_Sym *sym;
{
  bfd *dynobj;

  dynobj = elf_hash_table (info)->dynobj;

  if (h->plt.offset != (bfd_vma) -1)
    {
      asection *splt;
      asection *sgot;
      asection *srela;
      bfd_vma plt_index;
      bfd_vma got_offset;
      Elf_Internal_Rela rela;

      /* This symbol has an entry in the procedure linkage table.  Set
	 it up.	 */

      BFD_ASSERT (h->dynindx != -1);

      splt = bfd_get_section_by_name (dynobj, ".plt");
      sgot = bfd_get_section_by_name (dynobj, ".got.plt");
      srela = bfd_get_section_by_name (dynobj, ".rela.plt");
      BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);

      /* Get the index in the procedure linkage table which
	 corresponds to this symbol.  This is the index of this symbol
	 in all the symbols for which we are making plt entries.  The
	 first entry in the procedure linkage table is reserved.  */
      plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;

      /* Get the offset into the .got table of the entry that
	 corresponds to this function.	Each .got entry is GOT_ENTRY_SIZE
	 bytes. The first three are reserved for the dynamic linker.  */
      got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;

      /* Fill in the entry in the procedure linkage table.  */
      memcpy (splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
	      PLT_ENTRY_SIZE);

      /* Insert the relocation positions of the plt section.  The magic
	 numbers at the end of the statements are the positions of the
	 relocations in the plt section.  */
      /* Put offset for jmp *name@GOTPCREL(%rip), since the
	 instruction uses 6 bytes, subtract this value.  */
      bfd_put_32 (output_bfd,
		      (sgot->output_section->vma
		       + sgot->output_offset
		       + got_offset
		       - splt->output_section->vma
		       - splt->output_offset
		       - h->plt.offset
		       - 6),
		  splt->contents + h->plt.offset + 2);
      /* Put relocation index.  */
      bfd_put_32 (output_bfd, plt_index,
		  splt->contents + h->plt.offset + 7);
      /* Put offset for jmp .PLT0.  */
      bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
		  splt->contents + h->plt.offset + 12);

      /* Fill in the entry in the global offset table, initially this
	 points to the pushq instruction in the PLT which is at offset 6.  */
      bfd_put_64 (output_bfd, (splt->output_section->vma + splt->output_offset
			       + h->plt.offset + 6),
		  sgot->contents + got_offset);

      /* Fill in the entry in the .rela.plt section.  */
      rela.r_offset = (sgot->output_section->vma
		       + sgot->output_offset
		       + got_offset);
      rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
      rela.r_addend = 0;
      bfd_elf64_swap_reloca_out (output_bfd, &rela,
				 ((Elf64_External_Rela *) srela->contents
				  + plt_index));

      if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
	{
	  /* Mark the symbol as undefined, rather than as defined in
	     the .plt section.	Leave the value alone.	*/
	  sym->st_shndx = SHN_UNDEF;
	  /* If the symbol is weak, we do need to clear the value.
	     Otherwise, the PLT entry would provide a definition for
	     the symbol even if the symbol wasn't defined anywhere,
	     and so the symbol would never be NULL.  */
	  if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
	      == 0)
	    sym->st_value = 0;
	}
    }

  if (h->got.offset != (bfd_vma) -1)
    {
      asection *sgot;
      asection *srela;
      Elf_Internal_Rela rela;

      /* This symbol has an entry in the global offset table.  Set it
         up.  */

      sgot = bfd_get_section_by_name (dynobj, ".got");
      srela = bfd_get_section_by_name (dynobj, ".rela.got");
      BFD_ASSERT (sgot != NULL && srela != NULL);

      rela.r_offset = (sgot->output_section->vma
		       + sgot->output_offset
		       + (h->got.offset &~ (bfd_vma) 1));

      /* If this is a static link, or it is a -Bsymbolic link and the
	 symbol is defined locally or was forced to be local because
	 of a version file, we just want to emit a RELATIVE reloc.
	 The entry in the global offset table will already have been
	 initialized in the relocate_section function.  */
      if (! elf_hash_table (info)->dynamic_sections_created
	  || (info->shared
	      && (info->symbolic || h->dynindx == -1)
	      && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
	{
	  BFD_ASSERT((h->got.offset & 1) != 0);
	  rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
	  rela.r_addend = (h->root.u.def.value
			   + h->root.u.def.section->output_section->vma
			   + h->root.u.def.section->output_offset);
	}
      else
	{
	  BFD_ASSERT((h->got.offset & 1) == 0);
	  bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
	  rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
	  rela.r_addend = 0;
	}

      bfd_elf64_swap_reloca_out (output_bfd, &rela,
				 ((Elf64_External_Rela *) srela->contents
				  + srela->reloc_count));
      ++srela->reloc_count;
    }

  if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
    {
      asection *s;
      Elf_Internal_Rela rela;

      /* This symbol needs a copy reloc.  Set it up.  */

      BFD_ASSERT (h->dynindx != -1
		  && (h->root.type == bfd_link_hash_defined
		      || h->root.type == bfd_link_hash_defweak));

      s = bfd_get_section_by_name (h->root.u.def.section->owner,
				   ".rela.bss");
      BFD_ASSERT (s != NULL);

      rela.r_offset = (h->root.u.def.value
		       + h->root.u.def.section->output_section->vma
		       + h->root.u.def.section->output_offset);
      rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
      rela.r_addend = 0;
      bfd_elf64_swap_reloca_out (output_bfd, &rela,
				 ((Elf64_External_Rela *) s->contents
				  + s->reloc_count));
      ++s->reloc_count;
    }

  /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.  */
  if (strcmp (h->root.root.string, "_DYNAMIC") == 0
      || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
    sym->st_shndx = SHN_ABS;

  return true;
}

/* Finish up the dynamic sections.  */

static boolean
elf64_x86_64_finish_dynamic_sections (output_bfd, info)
     bfd *output_bfd;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *sdyn;
  asection *sgot;

  dynobj = elf_hash_table (info)->dynobj;

  sgot = bfd_get_section_by_name (dynobj, ".got.plt");
  BFD_ASSERT (sgot != NULL);
  sdyn = bfd_get_section_by_name (dynobj, ".dynamic");

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      asection *splt;
      Elf64_External_Dyn *dyncon, *dynconend;

      BFD_ASSERT (sdyn != NULL);

      dyncon = (Elf64_External_Dyn *) sdyn->contents;
      dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
      for (; dyncon < dynconend; dyncon++)
	{
	  Elf_Internal_Dyn dyn;
	  const char *name;
	  asection *s;

	  bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);

	  switch (dyn.d_tag)
	    {
	    default:
	      continue;

	    case DT_PLTGOT:
	      name = ".got";
	      goto get_vma;

	    case DT_JMPREL:
	      name = ".rela.plt";

	    get_vma:
	      s = bfd_get_section_by_name (output_bfd, name);
	      BFD_ASSERT (s != NULL);
	      dyn.d_un.d_ptr = s->vma;
	      break;

	    case DT_RELASZ:
	      /* FIXME: This comment and code is from elf64-alpha.c:  */
	      /* My interpretation of the TIS v1.1 ELF document indicates
		 that RELASZ should not include JMPREL.	 This is not what
		 the rest of the BFD does.  It is, however, what the
		 glibc ld.so wants.  Do this fixup here until we found
		 out who is right.  */
	      s = bfd_get_section_by_name (output_bfd, ".rela.plt");
	      if (s)
		{
		  /* Subtract JMPREL size from RELASZ.	*/
		  dyn.d_un.d_val -=
		    (s->_cooked_size ? s->_cooked_size : s->_raw_size);
		}
	      break;

	    case DT_PLTRELSZ:
	      s = bfd_get_section_by_name (output_bfd, ".rela.plt");
	      BFD_ASSERT (s != NULL);
	      dyn.d_un.d_val =
		(s->_cooked_size != 0 ? s->_cooked_size : s->_raw_size);
	      break;
	    }
	  bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
	}

      /* Initialize the contents of the .plt section.  */
      splt = bfd_get_section_by_name (dynobj, ".plt");
      BFD_ASSERT (splt != NULL);
      if (splt->_raw_size > 0)
	{
	  /* Fill in the first entry in the procedure linkage table.  */
	  memcpy (splt->contents, elf64_x86_64_plt0_entry, PLT_ENTRY_SIZE);
	  /* Add offset for pushq GOT+8(%rip), since the instruction
	     uses 6 bytes subtract this value.  */
	  bfd_put_32 (output_bfd,
		      (sgot->output_section->vma
		       + sgot->output_offset
		       + 8
		       - splt->output_section->vma
		       - splt->output_offset
		       - 6),
		      splt->contents + 2);
	  /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
	     the end of the instruction.  */
	  bfd_put_32 (output_bfd,
		      (sgot->output_section->vma
		       + sgot->output_offset
		       + 16
		       - splt->output_section->vma
		       - splt->output_offset
		       - 12),
		      splt->contents + 8);

	}

      elf_section_data (splt->output_section)->this_hdr.sh_entsize =
	PLT_ENTRY_SIZE;
    }

  /* Set the first entry in the global offset table to the address of
     the dynamic section.  */
  if (sgot->_raw_size > 0)
    {
      if (sdyn == NULL)
	bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
      else
	bfd_put_64 (output_bfd,
		    sdyn->output_section->vma + sdyn->output_offset,
		    sgot->contents);
      /* Write GOT[1] and GOT[2], needed for the dynamic linker.  */
      bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE);
      bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE*2);
    }

  elf_section_data (sgot->output_section)->this_hdr.sh_entsize =
    GOT_ENTRY_SIZE;

  return true;
}

static enum elf_reloc_type_class
elf64_x86_64_reloc_type_class (rela)
     const Elf_Internal_Rela *rela;
{
  switch ((int) ELF64_R_TYPE (rela->r_info))
    {
    case R_X86_64_RELATIVE:
      return reloc_class_relative;
    case R_X86_64_JUMP_SLOT:
      return reloc_class_plt;
    case R_X86_64_COPY:
      return reloc_class_copy;
    default:
      return reloc_class_normal;
    }
}

#define TARGET_LITTLE_SYM		    bfd_elf64_x86_64_vec
#define TARGET_LITTLE_NAME		    "elf64-x86-64"
#define ELF_ARCH			    bfd_arch_i386
#define ELF_MACHINE_CODE		    EM_X86_64
#define ELF_MAXPAGESIZE			    0x100000

#define elf_backend_can_gc_sections	    1
#define elf_backend_can_refcount	    1
#define elf_backend_want_got_plt	    1
#define elf_backend_plt_readonly	    1
#define elf_backend_want_plt_sym	    0
#define elf_backend_got_header_size	    (GOT_ENTRY_SIZE*3)
#define elf_backend_plt_header_size	    PLT_ENTRY_SIZE

#define elf_info_to_howto		    elf64_x86_64_info_to_howto

#define bfd_elf64_bfd_final_link	    _bfd_elf64_gc_common_final_link
#define bfd_elf64_bfd_link_hash_table_create \
  elf64_x86_64_link_hash_table_create
#define bfd_elf64_bfd_reloc_type_lookup	    elf64_x86_64_reloc_type_lookup

#define elf_backend_adjust_dynamic_symbol   elf64_x86_64_adjust_dynamic_symbol
#define elf_backend_check_relocs	    elf64_x86_64_check_relocs
#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
#define elf_backend_finish_dynamic_sections \
  elf64_x86_64_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol   elf64_x86_64_finish_dynamic_symbol
#define elf_backend_gc_mark_hook	    elf64_x86_64_gc_mark_hook
#define elf_backend_gc_sweep_hook	    elf64_x86_64_gc_sweep_hook
#define elf_backend_relocate_section	    elf64_x86_64_relocate_section
#define elf_backend_size_dynamic_sections   elf64_x86_64_size_dynamic_sections
#define elf_backend_object_p		    elf64_x86_64_elf_object_p
#define elf_backend_reloc_type_class	    elf64_x86_64_reloc_type_class

#include "elf64-target.h"