aboutsummaryrefslogtreecommitdiff
path: root/bfd/elf64-mmix.c
blob: bcf996265716056a4089ed4170ba954cb8530b4f (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
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
/* MMIX-specific support for 64-bit ELF.
   Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
   Contributed by Hans-Peter Nilsson <hp@bitrange.com>

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.  */

/* No specific ABI or "processor-specific supplement" defined.  */

/* TODO:
   - Linker relaxation.  */

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/mmix.h"
#include "opcode/mmix.h"

#define MINUS_ONE	(((bfd_vma) 0) - 1)

/* Put these everywhere in new code.  */
#define FATAL_DEBUG						\
 _bfd_abort (__FILE__, __LINE__,				\
	     "Internal: Non-debugged code (test-case missing)")

#define BAD_CASE(x)				\
 _bfd_abort (__FILE__, __LINE__,		\
	     "bad case for " #x)

struct _mmix_elf_section_data
{
  struct bfd_elf_section_data elf;
  union
  {
    struct bpo_reloc_section_info *reloc;
    struct bpo_greg_section_info *greg;
  } bpo;
};

#define mmix_elf_section_data(sec) \
  ((struct _mmix_elf_section_data *) elf_section_data (sec))

/* For each section containing a base-plus-offset (BPO) reloc, we attach
   this struct as mmix_elf_section_data (section)->bpo, which is otherwise
   NULL.  */
struct bpo_reloc_section_info
  {
    /* The base is 1; this is the first number in this section.  */
    size_t first_base_plus_offset_reloc;

    /* Number of BPO-relocs in this section.  */
    size_t n_bpo_relocs_this_section;

    /* Running index, used at relocation time.  */
    size_t bpo_index;

    /* We don't have access to the bfd_link_info struct in
       mmix_final_link_relocate.  What we really want to get at is the
       global single struct greg_relocation, so we stash it here.  */
    asection *bpo_greg_section;
  };

/* Helper struct (in global context) for the one below.
   There's one of these created for every BPO reloc.  */
struct bpo_reloc_request
  {
    bfd_vma value;

    /* Valid after relaxation.  The base is 0; the first register number
       must be added.  The offset is in range 0..255.  */
    size_t regindex;
    size_t offset;

    /* The order number for this BPO reloc, corresponding to the order in
       which BPO relocs were found.  Used to create an index after reloc
       requests are sorted.  */
    size_t bpo_reloc_no;

    /* Set when the value is computed.  Better than coding "guard values"
       into the other members.  Is FALSE only for BPO relocs in a GC:ed
       section.  */
    bfd_boolean valid;
  };

/* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated
   greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME),
   which is linked into the register contents section
   (MMIX_REG_CONTENTS_SECTION_NAME).  This section is created by the
   linker; using the same hook as for usual with BPO relocs does not
   collide.  */
struct bpo_greg_section_info
  {
    /* After GC, this reflects the number of remaining, non-excluded
       BPO-relocs.  */
    size_t n_bpo_relocs;

    /* This is the number of allocated bpo_reloc_requests; the size of
       sorted_indexes.  Valid after the check.*relocs functions are called
       for all incoming sections.  It includes the number of BPO relocs in
       sections that were GC:ed.  */
    size_t n_max_bpo_relocs;

    /* A counter used to find out when to fold the BPO gregs, since we
       don't have a single "after-relaxation" hook.  */
    size_t n_remaining_bpo_relocs_this_relaxation_round;

    /* The number of linker-allocated GREGs resulting from BPO relocs.
       This is an approximation after _bfd_mmix_allocated_gregs_init and
       supposedly accurate after mmix_elf_relax_section is called for all
       incoming non-collected sections.  */
    size_t n_allocated_bpo_gregs;

    /* Index into reloc_request[], sorted on increasing "value", secondary
       by increasing index for strict sorting order.  */
    size_t *bpo_reloc_indexes;

    /* An array of all relocations, with the "value" member filled in by
       the relaxation function.  */
    struct bpo_reloc_request *reloc_request;
  };

static bfd_boolean mmix_elf_link_output_symbol_hook
  PARAMS ((bfd *, struct bfd_link_info *, const char *,
	   Elf_Internal_Sym *, asection *));

static bfd_reloc_status_type mmix_elf_reloc
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));

static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));

static void mmix_info_to_howto_rela
  PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));

static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR));

static bfd_boolean mmix_elf_new_section_hook
  PARAMS ((bfd *, asection *));

static bfd_boolean mmix_elf_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
	   const Elf_Internal_Rela *));

static bfd_boolean mmix_elf_check_common_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
	   const Elf_Internal_Rela *));

static bfd_boolean mmix_elf_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
	   Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));

static asection * mmix_elf_gc_mark_hook
  PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
	   struct elf_link_hash_entry *, Elf_Internal_Sym *));

static bfd_boolean mmix_elf_gc_sweep_hook
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
	   const Elf_Internal_Rela *));

static bfd_reloc_status_type mmix_final_link_relocate
  PARAMS ((reloc_howto_type *, asection *, bfd_byte *,
	   bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *));

static bfd_reloc_status_type mmix_elf_perform_relocation
  PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma));

static bfd_boolean mmix_elf_section_from_bfd_section
  PARAMS ((bfd *, asection *, int *));

static bfd_boolean mmix_elf_add_symbol_hook
  PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *,
	   const char **, flagword *, asection **, bfd_vma *));

static bfd_boolean mmix_elf_is_local_label_name
  PARAMS ((bfd *, const char *));

static int bpo_reloc_request_sort_fn PARAMS ((const PTR, const PTR));

static bfd_boolean mmix_elf_relax_section
  PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
	   bfd_boolean *again));

extern bfd_boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *));

extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *));

/* Only intended to be called from a debugger.  */
extern void mmix_dump_bpo_gregs
  PARAMS ((struct bfd_link_info *, bfd_error_handler_type));

/* Watch out: this currently needs to have elements with the same index as
   their R_MMIX_ number.  */
static reloc_howto_type elf_mmix_howto_table[] =
 {
  /* This reloc does nothing.  */
  HOWTO (R_MMIX_NONE,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_NONE",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* An 8 bit absolute relocation.  */
  HOWTO (R_MMIX_8,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_8",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xff,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* An 16 bit absolute relocation.  */
  HOWTO (R_MMIX_16,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_16",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* An 24 bit absolute relocation.  */
  HOWTO (R_MMIX_24,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_24",		/* name */
	 FALSE,			/* partial_inplace */
	 ~0xffffff,		/* src_mask */
	 0xffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 32 bit absolute relocation.  */
  HOWTO (R_MMIX_32,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_32",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* 64 bit relocation.  */
  HOWTO (R_MMIX_64,		/* type */
	 0,			/* rightshift */
	 4,			/* size (0 = byte, 1 = short, 2 = long) */
	 64,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_64",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 MINUS_ONE,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* An 8 bit PC-relative relocation.  */
  HOWTO (R_MMIX_PC_8,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_PC_8",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xff,			/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* An 16 bit PC-relative relocation.  */
  HOWTO (R_MMIX_PC_16,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_PC_16",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* An 24 bit PC-relative relocation.  */
  HOWTO (R_MMIX_PC_24,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_PC_24",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0xffffff,		/* src_mask */
	 0xffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A 32 bit absolute PC-relative relocation.  */
  HOWTO (R_MMIX_PC_32,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_PC_32",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* 64 bit PC-relative relocation.  */
  HOWTO (R_MMIX_PC_64,		/* type */
	 0,			/* rightshift */
	 4,			/* size (0 = byte, 1 = short, 2 = long) */
	 64,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_MMIX_PC_64",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 MINUS_ONE,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* GNU extension to record C++ vtable hierarchy.  */
  HOWTO (R_MMIX_GNU_VTINHERIT, /* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 NULL,			/* special_function */
	 "R_MMIX_GNU_VTINHERIT", /* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* GNU extension to record C++ vtable member usage.  */
  HOWTO (R_MMIX_GNU_VTENTRY,	/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 _bfd_elf_rel_vtable_reloc_fn,	/* special_function */
	 "R_MMIX_GNU_VTENTRY", /* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* The GETA relocation is supposed to get any address that could
     possibly be reached by the GETA instruction.  It can silently expand
     to get a 64-bit operand, but will complain if any of the two least
     significant bits are set.  The howto members reflect a simple GETA.  */
  HOWTO (R_MMIX_GETA,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_GETA",		/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_GETA_1,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_GETA_1",		/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_GETA_2,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_GETA_2",		/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_GETA_3,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_GETA_3",		/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* The conditional branches are supposed to reach any (code) address.
     It can silently expand to a 64-bit operand, but will emit an error if
     any of the two least significant bits are set.  The howto members
     reflect a simple branch.  */
  HOWTO (R_MMIX_CBRANCH,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_CBRANCH",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),		       	/* pcrel_offset */

  HOWTO (R_MMIX_CBRANCH_J,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_CBRANCH_J",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_CBRANCH_1,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_CBRANCH_1",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_CBRANCH_2,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_CBRANCH_2",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_CBRANCH_3,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_CBRANCH_3",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* The PUSHJ instruction can reach any (code) address, as long as it's
     the beginning of a function (no usable restriction).  It can silently
     expand to a 64-bit operand, but will emit an error if any of the two
     least significant bits are set.  The howto members reflect a simple
     PUSHJ.  */
  HOWTO (R_MMIX_PUSHJ,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_PUSHJ",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_PUSHJ_1,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_PUSHJ_1",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_PUSHJ_2,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_PUSHJ_2",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_PUSHJ_3,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_PUSHJ_3",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A JMP is supposed to reach any (code) address.  By itself, it can
     reach +-64M; the expansion can reach all 64 bits.  Note that the 64M
     limit is soon reached if you link the program in wildly different
     memory segments.  The howto members reflect a trivial JMP.  */
  HOWTO (R_MMIX_JMP,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 27,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_JMP",		/* name */
	 FALSE,			/* partial_inplace */
	 ~0x1ffffff,		/* src_mask */
	 0x1ffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_JMP_1,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 27,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_JMP_1",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x1ffffff,		/* src_mask */
	 0x1ffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_JMP_2,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 27,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_JMP_2",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x1ffffff,		/* src_mask */
	 0x1ffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  HOWTO (R_MMIX_JMP_3,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 27,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_JMP_3",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x1ffffff,		/* src_mask */
	 0x1ffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* When we don't emit link-time-relaxable code from the assembler, or
     when relaxation has done all it can do, these relocs are used.  For
     GETA/PUSHJ/branches.  */
  HOWTO (R_MMIX_ADDR19,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 19,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_ADDR19",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x0100ffff,		/* src_mask */
	 0x0100ffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* For JMP.  */
  HOWTO (R_MMIX_ADDR27,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 27,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_ADDR27",	/* name */
	 FALSE,			/* partial_inplace */
	 ~0x1ffffff,		/* src_mask */
	 0x1ffffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */

  /* A general register or the value 0..255.  If a value, then the
     instruction (offset -3) needs adjusting.  */
  HOWTO (R_MMIX_REG_OR_BYTE,	/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_REG_OR_BYTE",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xff,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A general register.  */
  HOWTO (R_MMIX_REG,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_REG",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xff,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A register plus an index, corresponding to the relocation expression.
     The sizes must correspond to the valid range of the expression, while
     the bitmasks correspond to what we store in the image.  */
  HOWTO (R_MMIX_BASE_PLUS_OFFSET,	/* type */
	 0,			/* rightshift */
	 4,			/* size (0 = byte, 1 = short, 2 = long) */
	 64,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_BASE_PLUS_OFFSET", /* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A "magic" relocation for a LOCAL expression, asserting that the
     expression is less than the number of global registers.  No actual
     modification of the contents is done.  Implementing this as a
     relocation was less intrusive than e.g. putting such expressions in a
     section to discard *after* relocation.  */
  HOWTO (R_MMIX_LOCAL,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 mmix_elf_reloc,	/* special_function */
	 "R_MMIX_LOCAL",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */
 };


/* Map BFD reloc types to MMIX ELF reloc types.  */

struct mmix_reloc_map
  {
    bfd_reloc_code_real_type bfd_reloc_val;
    enum elf_mmix_reloc_type elf_reloc_val;
  };


static const struct mmix_reloc_map mmix_reloc_map[] =
  {
    {BFD_RELOC_NONE, R_MMIX_NONE},
    {BFD_RELOC_8, R_MMIX_8},
    {BFD_RELOC_16, R_MMIX_16},
    {BFD_RELOC_24, R_MMIX_24},
    {BFD_RELOC_32, R_MMIX_32},
    {BFD_RELOC_64, R_MMIX_64},
    {BFD_RELOC_8_PCREL, R_MMIX_PC_8},
    {BFD_RELOC_16_PCREL, R_MMIX_PC_16},
    {BFD_RELOC_24_PCREL, R_MMIX_PC_24},
    {BFD_RELOC_32_PCREL, R_MMIX_PC_32},
    {BFD_RELOC_64_PCREL, R_MMIX_PC_64},
    {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT},
    {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY},
    {BFD_RELOC_MMIX_GETA, R_MMIX_GETA},
    {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH},
    {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ},
    {BFD_RELOC_MMIX_JMP, R_MMIX_JMP},
    {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19},
    {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27},
    {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE},
    {BFD_RELOC_MMIX_REG, R_MMIX_REG},
    {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET},
    {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL}
  };

static reloc_howto_type *
bfd_elf64_bfd_reloc_type_lookup (abfd, code)
     bfd *abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  unsigned int i;

  for (i = 0;
       i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]);
       i++)
    {
      if (mmix_reloc_map[i].bfd_reloc_val == code)
	return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val];
    }

  return NULL;
}

static bfd_boolean
mmix_elf_new_section_hook (abfd, sec)
     bfd *abfd;
     asection *sec;
{
  struct _mmix_elf_section_data *sdata;
  bfd_size_type amt = sizeof (*sdata);

  sdata = (struct _mmix_elf_section_data *) bfd_zalloc (abfd, amt);
  if (sdata == NULL)
    return FALSE;
  sec->used_by_bfd = (PTR) sdata;

  return _bfd_elf_new_section_hook (abfd, sec);
}


/* This function performs the actual bitfiddling and sanity check for a
   final relocation.  Each relocation gets its *worst*-case expansion
   in size when it arrives here; any reduction in size should have been
   caught in linker relaxation earlier.  When we get here, the relocation
   looks like the smallest instruction with SWYM:s (nop:s) appended to the
   max size.  We fill in those nop:s.

   R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra)
    GETA $N,foo
   ->
    SETL $N,foo & 0xffff
    INCML $N,(foo >> 16) & 0xffff
    INCMH $N,(foo >> 32) & 0xffff
    INCH $N,(foo >> 48) & 0xffff

   R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but
   condbranches needing relaxation might be rare enough to not be
   worthwhile.)
    [P]Bcc $N,foo
   ->
    [~P]B~cc $N,.+20
    SETL $255,foo & ...
    INCML ...
    INCMH ...
    INCH ...
    GO $255,$255,0

   R_MMIX_PUSHJ: (FIXME: Relaxation...)
    PUSHJ $N,foo
   ->
    SETL $255,foo & ...
    INCML ...
    INCMH ...
    INCH ...
    PUSHGO $N,$255,0

   R_MMIX_JMP: (FIXME: Relaxation...)
    JMP foo
   ->
    SETL $255,foo & ...
    INCML ...
    INCMH ...
    INCH ...
    GO $255,$255,0

   R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in.  */

static bfd_reloc_status_type
mmix_elf_perform_relocation (isec, howto, datap, addr, value)
     asection *isec;
     reloc_howto_type *howto;
     PTR datap;
     bfd_vma addr ATTRIBUTE_UNUSED;
     bfd_vma value;
{
  bfd *abfd = isec->owner;
  bfd_reloc_status_type flag = bfd_reloc_ok;
  bfd_reloc_status_type r;
  int offs = 0;
  int reg = 255;

  /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences.
     We handle the differences here and the common sequence later.  */
  switch (howto->type)
    {
    case R_MMIX_GETA:
      offs = 0;
      reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);

      /* We change to an absolute value.  */
      value += addr;
      break;

    case R_MMIX_CBRANCH:
      {
	int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16;

	/* Invert the condition and prediction bit, and set the offset
	   to five instructions ahead.

	   We *can* do better if we want to.  If the branch is found to be
	   within limits, we could leave the branch as is; there'll just
	   be a bunch of NOP:s after it.  But we shouldn't see this
	   sequence often enough that it's worth doing it.  */

	bfd_put_32 (abfd,
		    (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff)
		     | (24/4)),
		    (bfd_byte *) datap);

	/* Put a "GO $255,$255,0" after the common sequence.  */
	bfd_put_32 (abfd,
		    ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00,
		    (bfd_byte *) datap + 20);

	/* Common sequence starts at offset 4.  */
	offs = 4;

	/* We change to an absolute value.  */
	value += addr;
      }
      break;

    case R_MMIX_PUSHJ:
      {
	int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);

	/* Put a "PUSHGO $N,$255,0" after the common sequence.  */
	bfd_put_32 (abfd,
		    ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
		    | (inreg << 16)
		    | 0xff00,
		    (bfd_byte *) datap + 16);

	/* We change to an absolute value.  */
	value += addr;
      }
      break;

    case R_MMIX_JMP:
      /* This one is a little special.  If we get here on a non-relaxing
	 link, and the destination is actually in range, we don't need to
	 execute the nops.
	 If so, we fall through to the bit-fiddling relocs.

	 FIXME: bfd_check_overflow seems broken; the relocation is
	 rightshifted before testing, so supply a zero rightshift.  */

      if (! ((value & 3) == 0
	     && (r = bfd_check_overflow (complain_overflow_signed,
					 howto->bitsize,
					 0,
					 bfd_arch_bits_per_address (abfd),
					 value)) == bfd_reloc_ok))
	{
	  /* If the relocation doesn't fit in a JMP, we let the NOP:s be
	     modified below, and put a "GO $255,$255,0" after the
	     address-loading sequence.  */
	  bfd_put_32 (abfd,
		      ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
		      | 0xffff00,
		      (bfd_byte *) datap + 16);

	  /* We change to an absolute value.  */
	  value += addr;
	  break;
	}
      /* FALLTHROUGH.  */
    case R_MMIX_ADDR19:
    case R_MMIX_ADDR27:
      /* These must be in range, or else we emit an error.  */
      if ((value & 3) == 0
	  /* Note rightshift 0; see above.  */
	  && (r = bfd_check_overflow (complain_overflow_signed,
				      howto->bitsize,
				      0,
				      bfd_arch_bits_per_address (abfd),
				      value)) == bfd_reloc_ok)
	{
	  bfd_vma in1
	    = bfd_get_32 (abfd, (bfd_byte *) datap);
	  bfd_vma highbit;

	  if ((bfd_signed_vma) value < 0)
	    {
	      highbit = (1 << 24);
	      value += (1 << (howto->bitsize - 1));
	    }
	  else
	    highbit = 0;

	  value >>= 2;

	  bfd_put_32 (abfd,
		      (in1 & howto->src_mask)
		      | highbit
		      | (value & howto->dst_mask),
		      (bfd_byte *) datap);

	  return bfd_reloc_ok;
	}
      else
	return bfd_reloc_overflow;

    case R_MMIX_BASE_PLUS_OFFSET:
      {
	struct bpo_reloc_section_info *bpodata
	  = mmix_elf_section_data (isec)->bpo.reloc;
	asection *bpo_greg_section
	  = bpodata->bpo_greg_section;
	struct bpo_greg_section_info *gregdata
	  = mmix_elf_section_data (bpo_greg_section)->bpo.greg;
	size_t bpo_index
	  = gregdata->bpo_reloc_indexes[bpodata->bpo_index++];

	/* A consistency check: The value we now have in "relocation" must
	   be the same as the value we stored for that relocation.  It
	   doesn't cost much, so can be left in at all times.  */
	if (value != gregdata->reloc_request[bpo_index].value)
	  {
	    (*_bfd_error_handler)
	      (_("%s: Internal inconsistency error for value for\n\
 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"),
	       bfd_get_filename (isec->owner),
	       (unsigned long) (value >> 32), (unsigned long) value,
	       (unsigned long) (gregdata->reloc_request[bpo_index].value
				>> 32),
	       (unsigned long) gregdata->reloc_request[bpo_index].value);
	    bfd_set_error (bfd_error_bad_value);
	    return bfd_reloc_overflow;
	  }

	/* Then store the register number and offset for that register
	   into datap and datap + 1 respectively.  */
	bfd_put_8 (abfd,
		   gregdata->reloc_request[bpo_index].regindex
		   + bpo_greg_section->output_section->vma / 8,
		   datap);
	bfd_put_8 (abfd,
		   gregdata->reloc_request[bpo_index].offset,
		   ((unsigned char *) datap) + 1);
	return bfd_reloc_ok;
      }

    case R_MMIX_REG_OR_BYTE:
    case R_MMIX_REG:
      if (value > 255)
	return bfd_reloc_overflow;
      bfd_put_8 (abfd, value, datap);
      return bfd_reloc_ok;

    default:
      BAD_CASE (howto->type);
    }

  /* This code adds the common SETL/INCML/INCMH/INCH worst-case
     sequence.  */

  /* Lowest two bits must be 0.  We return bfd_reloc_overflow for
     everything that looks strange.  */
  if (value & 3)
    flag = bfd_reloc_overflow;

  bfd_put_32 (abfd,
	      (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16),
	      (bfd_byte *) datap + offs);
  bfd_put_32 (abfd,
	      (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16),
	      (bfd_byte *) datap + offs + 4);
  bfd_put_32 (abfd,
	      (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16),
	      (bfd_byte *) datap + offs + 8);
  bfd_put_32 (abfd,
	      (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16),
	      (bfd_byte *) datap + offs + 12);

  return flag;
}

/* Set the howto pointer for an MMIX ELF reloc (type RELA).  */

static void
mmix_info_to_howto_rela (abfd, cache_ptr, dst)
     bfd *abfd ATTRIBUTE_UNUSED;
     arelent *cache_ptr;
     Elf_Internal_Rela *dst;
{
  unsigned int r_type;

  r_type = ELF64_R_TYPE (dst->r_info);
  BFD_ASSERT (r_type < (unsigned int) R_MMIX_max);
  cache_ptr->howto = &elf_mmix_howto_table[r_type];
}

/* Any MMIX-specific relocation gets here at assembly time or when linking
   to other formats (such as mmo); this is the relocation function from
   the reloc_table.  We don't get here for final pure ELF linking.  */

static bfd_reloc_status_type
mmix_elf_reloc (abfd, reloc_entry, symbol, data, input_section,
		output_bfd, error_message)
     bfd *abfd;
     arelent *reloc_entry;
     asymbol *symbol;
     PTR data;
     asection *input_section;
     bfd *output_bfd;
     char **error_message ATTRIBUTE_UNUSED;
{
  bfd_vma relocation;
  bfd_reloc_status_type r;
  asection *reloc_target_output_section;
  bfd_reloc_status_type flag = bfd_reloc_ok;
  bfd_vma output_base = 0;
  bfd_vma addr;

  r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
			     input_section, output_bfd, error_message);

  /* If that was all that was needed (i.e. this isn't a final link, only
     some segment adjustments), we're done.  */
  if (r != bfd_reloc_continue)
    return r;

  if (bfd_is_und_section (symbol->section)
      && (symbol->flags & BSF_WEAK) == 0
      && output_bfd == (bfd *) NULL)
    return bfd_reloc_undefined;

  /* Is the address of the relocation really within the section?  */
  if (reloc_entry->address > input_section->_cooked_size)
    return bfd_reloc_outofrange;

  /* Work out which section the relocation is targetted at and the
     initial relocation command value.  */

  /* Get symbol value.  (Common symbols are special.)  */
  if (bfd_is_com_section (symbol->section))
    relocation = 0;
  else
    relocation = symbol->value;

  reloc_target_output_section = bfd_get_output_section (symbol);

  /* Here the variable relocation holds the final address of the symbol we
     are relocating against, plus any addend.  */
  if (output_bfd)
    output_base = 0;
  else
    output_base = reloc_target_output_section->vma;

  relocation += output_base + symbol->section->output_offset;

  /* Get position of relocation.  */
  addr = (reloc_entry->address + input_section->output_section->vma
	  + input_section->output_offset);
  if (output_bfd != (bfd *) NULL)
    {
      /* Add in supplied addend.  */
      relocation += reloc_entry->addend;

      /* This is a partial relocation, and we want to apply the
	 relocation to the reloc entry rather than the raw data.
	 Modify the reloc inplace to reflect what we now know.  */
      reloc_entry->addend = relocation;
      reloc_entry->address += input_section->output_offset;
      return flag;
    }

  return mmix_final_link_relocate (reloc_entry->howto, input_section,
				   data, reloc_entry->address,
				   reloc_entry->addend, relocation,
				   bfd_asymbol_name (symbol),
				   reloc_target_output_section);
}

/* Relocate an MMIX ELF section.  Modified from elf32-fr30.c; look to it
   for guidance if you're thinking of copying this.  */

static bfd_boolean
mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section,
			   contents, relocs, local_syms, local_sections)
     bfd *output_bfd ATTRIBUTE_UNUSED;
     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;
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  Elf_Internal_Rela *rel;
  Elf_Internal_Rela *relend;

  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  relend = relocs + input_section->reloc_count;

  for (rel = relocs; rel < relend; rel ++)
    {
      reloc_howto_type *howto;
      unsigned long r_symndx;
      Elf_Internal_Sym *sym;
      asection *sec;
      struct elf_link_hash_entry *h;
      bfd_vma relocation;
      bfd_reloc_status_type r;
      const char *name = NULL;
      int r_type;
      bfd_boolean undefined_signalled = FALSE;

      r_type = ELF64_R_TYPE (rel->r_info);

      if (r_type == R_MMIX_GNU_VTINHERIT
	  || r_type == R_MMIX_GNU_VTENTRY)
	continue;

      r_symndx = ELF64_R_SYM (rel->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];
		  rel->r_addend += sec->output_offset + sym->st_value;
		}
	    }

	  continue;
	}

      /* This is a final link.  */
      howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
      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, rel);

	  name = bfd_elf_string_from_elf_section
	    (input_bfd, symtab_hdr->sh_link, sym->st_name);
	  name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
	}
      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;

	  name = h->root.root.string;

	  if (h->root.type == bfd_link_hash_defined
	      || h->root.type == bfd_link_hash_defweak)
	    {
	      sec = h->root.u.def.section;
	      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
		   && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
	    relocation = 0;
	  else
	    {
	      /* The test on undefined_signalled is redundant at the
		 moment, but kept for symmetry.  */
	      if (! undefined_signalled
		  && ! ((*info->callbacks->undefined_symbol)
			(info, h->root.root.string, input_bfd,
			 input_section, rel->r_offset, TRUE)))
		return FALSE;
	      undefined_signalled = TRUE;
	      relocation = 0;
	    }
	}

      r = mmix_final_link_relocate (howto, input_section,
				    contents, rel->r_offset,
				    rel->r_addend, relocation, name, sec);

      if (r != bfd_reloc_ok)
	{
	  bfd_boolean check_ok = TRUE;
	  const char * msg = (const char *) NULL;

	  switch (r)
	    {
	    case bfd_reloc_overflow:
	      check_ok = info->callbacks->reloc_overflow
		(info, name, howto->name, (bfd_vma) 0,
		 input_bfd, input_section, rel->r_offset);
	      break;

	    case bfd_reloc_undefined:
	      /* We may have sent this message above.  */
	      if (! undefined_signalled)
		check_ok = info->callbacks->undefined_symbol
		  (info, name, input_bfd, input_section, rel->r_offset,
		   TRUE);
	      undefined_signalled = TRUE;
	      break;

	    case bfd_reloc_outofrange:
	      msg = _("internal error: out of range error");
	      break;

	    case bfd_reloc_notsupported:
	      msg = _("internal error: unsupported relocation error");
	      break;

	    case bfd_reloc_dangerous:
	      msg = _("internal error: dangerous relocation");
	      break;

	    default:
	      msg = _("internal error: unknown error");
	      break;
	    }

	  if (msg)
	    check_ok = info->callbacks->warning
	      (info, msg, name, input_bfd, input_section, rel->r_offset);

	  if (! check_ok)
	    return FALSE;
	}
    }

  return TRUE;
}

/* Perform a single relocation.  By default we use the standard BFD
   routines.  A few relocs we have to do ourselves.  */

static bfd_reloc_status_type
mmix_final_link_relocate (howto, input_section, contents,
			  r_offset, r_addend, relocation, symname, symsec)
     reloc_howto_type *howto;
     asection *input_section;
     bfd_byte *contents;
     bfd_vma r_offset;
     bfd_signed_vma r_addend;
     bfd_vma relocation;
     const char *symname;
     asection *symsec;
{
  bfd_reloc_status_type r = bfd_reloc_ok;
  bfd_vma addr
    = (input_section->output_section->vma
       + input_section->output_offset
       + r_offset);
  bfd_signed_vma srel
    = (bfd_signed_vma) relocation + r_addend;

  switch (howto->type)
    {
      /* All these are PC-relative.  */
    case R_MMIX_PUSHJ:
    case R_MMIX_CBRANCH:
    case R_MMIX_ADDR19:
    case R_MMIX_GETA:
    case R_MMIX_ADDR27:
    case R_MMIX_JMP:
      contents += r_offset;

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

      r = mmix_elf_perform_relocation (input_section, howto, contents,
				       addr, srel);
      break;

    case R_MMIX_BASE_PLUS_OFFSET:
      if (symsec == NULL)
	return bfd_reloc_undefined;

      /* Check that we're not relocating against a register symbol.  */
      if (strcmp (bfd_get_section_name (symsec->owner, symsec),
		  MMIX_REG_CONTENTS_SECTION_NAME) == 0
	  || strcmp (bfd_get_section_name (symsec->owner, symsec),
		     MMIX_REG_SECTION_NAME) == 0)
	{
	  /* Note: This is separated out into two messages in order
	     to ease the translation into other languages.  */
	  if (symname == NULL || *symname == 0)
	    (*_bfd_error_handler)
	      (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"),
	       bfd_get_filename (input_section->owner),
	       bfd_get_section_name (symsec->owner, symsec));
	  else
	    (*_bfd_error_handler)
	      (_("%s: base-plus-offset relocation against register symbol: %s in %s"),
	       bfd_get_filename (input_section->owner), symname,
	       bfd_get_section_name (symsec->owner, symsec));
	  return bfd_reloc_overflow;
	}
      goto do_mmix_reloc;

    case R_MMIX_REG_OR_BYTE:
    case R_MMIX_REG:
      /* For now, we handle these alike.  They must refer to an register
	 symbol, which is either relative to the register section and in
	 the range 0..255, or is in the register contents section with vma
	 regno * 8.  */

      /* FIXME: A better way to check for reg contents section?
	 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */
      if (symsec == NULL)
	return bfd_reloc_undefined;

      if (strcmp (bfd_get_section_name (symsec->owner, symsec),
		  MMIX_REG_CONTENTS_SECTION_NAME) == 0)
	{
	  if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
	    {
	      /* The bfd_reloc_outofrange return value, though intuitively
		 a better value, will not get us an error.  */
	      return bfd_reloc_overflow;
	    }
	  srel /= 8;
	}
      else if (strcmp (bfd_get_section_name (symsec->owner, symsec),
		       MMIX_REG_SECTION_NAME) == 0)
	{
	  if (srel < 0 || srel > 255)
	    /* The bfd_reloc_outofrange return value, though intuitively a
	       better value, will not get us an error.  */
	    return bfd_reloc_overflow;
	}
      else
	{
	  /* Note: This is separated out into two messages in order
	     to ease the translation into other languages.  */
	  if (symname == NULL || *symname == 0)
	    (*_bfd_error_handler)
	      (_("%s: register relocation against non-register symbol: (unknown) in %s"),
	       bfd_get_filename (input_section->owner),
	       bfd_get_section_name (symsec->owner, symsec));
	  else
	    (*_bfd_error_handler)
	      (_("%s: register relocation against non-register symbol: %s in %s"),
	       bfd_get_filename (input_section->owner), symname,
	       bfd_get_section_name (symsec->owner, symsec));

	  /* The bfd_reloc_outofrange return value, though intuitively a
	     better value, will not get us an error.  */
	  return bfd_reloc_overflow;
	}
    do_mmix_reloc:
      contents += r_offset;
      r = mmix_elf_perform_relocation (input_section, howto, contents,
				       addr, srel);
      break;

    case R_MMIX_LOCAL:
      /* This isn't a real relocation, it's just an assertion that the
	 final relocation value corresponds to a local register.  We
	 ignore the actual relocation; nothing is changed.  */
      {
	asection *regsec
	  = bfd_get_section_by_name (input_section->output_section->owner,
				     MMIX_REG_CONTENTS_SECTION_NAME);
	bfd_vma first_global;

	/* Check that this is an absolute value, or a reference to the
	   register contents section or the register (symbol) section.
	   Absolute numbers can get here as undefined section.  Undefined
	   symbols are signalled elsewhere, so there's no conflict in us
	   accidentally handling it.  */
	if (!bfd_is_abs_section (symsec)
	    && !bfd_is_und_section (symsec)
	    && strcmp (bfd_get_section_name (symsec->owner, symsec),
		       MMIX_REG_CONTENTS_SECTION_NAME) != 0
	    && strcmp (bfd_get_section_name (symsec->owner, symsec),
		       MMIX_REG_SECTION_NAME) != 0)
	{
	  (*_bfd_error_handler)
	    (_("%s: directive LOCAL valid only with a register or absolute value"),
	     bfd_get_filename (input_section->owner));

	  return bfd_reloc_overflow;
	}

      /* If we don't have a register contents section, then $255 is the
	 first global register.  */
      if (regsec == NULL)
	first_global = 255;
      else
	{
	  first_global = bfd_get_section_vma (abfd, regsec) / 8;
	  if (strcmp (bfd_get_section_name (symsec->owner, symsec),
		      MMIX_REG_CONTENTS_SECTION_NAME) == 0)
	    {
	      if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
		/* The bfd_reloc_outofrange return value, though
		   intuitively a better value, will not get us an error.  */
		return bfd_reloc_overflow;
	      srel /= 8;
	    }
	}

	if ((bfd_vma) srel >= first_global)
	  {
	    /* FIXME: Better error message.  */
	    (*_bfd_error_handler)
	      (_("%s: LOCAL directive: Register $%ld is not a local register.  First global register is $%ld."),
	       bfd_get_filename (input_section->owner), (long) srel, (long) first_global);

	    return bfd_reloc_overflow;
	  }
      }
      r = bfd_reloc_ok;
      break;

    default:
      r = _bfd_final_link_relocate (howto, input_section->owner, input_section,
				    contents, r_offset,
				    relocation, r_addend);
    }

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

static asection *
mmix_elf_gc_mark_hook (sec, info, rel, h, sym)
     asection *sec;
     struct bfd_link_info *info ATTRIBUTE_UNUSED;
     Elf_Internal_Rela *rel;
     struct elf_link_hash_entry *h;
     Elf_Internal_Sym *sym;
{
  if (h != NULL)
    {
      switch (ELF64_R_TYPE (rel->r_info))
	{
	case R_MMIX_GNU_VTINHERIT:
	case R_MMIX_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 (sec->owner, sym->st_shndx);

  return NULL;
}

/* Update relocation info for a GC-excluded section.  We could supposedly
   perform the allocation after GC, but there's no suitable hook between
   GC (or section merge) and the point when all input sections must be
   present.  Better to waste some memory and (perhaps) a little time.  */

static bfd_boolean
mmix_elf_gc_sweep_hook (abfd, info, sec, relocs)
     bfd *abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *info ATTRIBUTE_UNUSED;
     asection *sec ATTRIBUTE_UNUSED;
     const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
{
  struct bpo_reloc_section_info *bpodata
    = mmix_elf_section_data (sec)->bpo.reloc;
  asection *allocated_gregs_section;

  /* If no bpodata here, we have nothing to do.  */
  if (bpodata == NULL)
    return TRUE;

  allocated_gregs_section = bpodata->bpo_greg_section;

  mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs
    -= bpodata->n_bpo_relocs_this_section;

  return TRUE;
}

/* Sort register relocs to come before expanding relocs.  */

static int
mmix_elf_sort_relocs (p1, p2)
     const PTR p1;
     const PTR p2;
{
  const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1;
  const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2;
  int r1_is_reg, r2_is_reg;

  /* Sort primarily on r_offset & ~3, so relocs are done to consecutive
     insns.  */
  if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3))
    return 1;
  else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3))
    return -1;

  r1_is_reg
    = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE
       || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG);
  r2_is_reg
    = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE
       || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG);
  if (r1_is_reg != r2_is_reg)
    return r2_is_reg - r1_is_reg;

  /* Neither or both are register relocs.  Then sort on full offset.  */
  if (r1->r_offset > r2->r_offset)
    return 1;
  else if (r1->r_offset < r2->r_offset)
    return -1;
  return 0;
}

/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking.  */

static bfd_boolean
mmix_elf_check_common_relocs  (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  bfd *bpo_greg_owner = NULL;
  asection *allocated_gregs_section = NULL;
  struct bpo_greg_section_info *gregdata = NULL;
  struct bpo_reloc_section_info *bpodata = NULL;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;

  if (info->relocateable)
    return TRUE;

  /* We currently have to abuse this COFF-specific member, since there's
     no target-machine-dedicated member.  There's no alternative outside
     the bfd_link_info struct; we can't specialize a hash-table since
     they're different between ELF and mmo.  */
  bpo_greg_owner = (bfd *) info->base_file;

  rel_end = relocs + sec->reloc_count;
  for (rel = relocs; rel < rel_end; rel++)
    {
      switch (ELF64_R_TYPE (rel->r_info))
        {
	  /* This relocation causes a GREG allocation.  We need to count
	     them, and we need to create a section for them, so we need an
	     object to fake as the owner of that section.  We can't use
	     the ELF dynobj for this, since the ELF bits assume lots of
	     DSO-related stuff if that member is non-NULL.  */
	case R_MMIX_BASE_PLUS_OFFSET:
	  if (bpo_greg_owner == NULL)
	    {
	      bpo_greg_owner = abfd;
	      info->base_file = (PTR) bpo_greg_owner;
	    }

	  if (allocated_gregs_section == NULL)
	    allocated_gregs_section
	      = bfd_get_section_by_name (bpo_greg_owner,
					 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);

	  if (allocated_gregs_section == NULL)
	    {
	      allocated_gregs_section
		= bfd_make_section (bpo_greg_owner,
				    MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
	      /* Setting both SEC_ALLOC and SEC_LOAD means the section is
		 treated like any other section, and we'd get errors for
		 address overlap with the text section.  Let's set none of
		 those flags, as that is what currently happens for usual
		 GREG allocations, and that works.  */
	      if (allocated_gregs_section == NULL
		  || !bfd_set_section_flags (bpo_greg_owner,
					     allocated_gregs_section,
					     (SEC_HAS_CONTENTS
					      | SEC_IN_MEMORY
					      | SEC_LINKER_CREATED))
		  || !bfd_set_section_alignment (bpo_greg_owner,
						 allocated_gregs_section,
						 3))
		return FALSE;

	      gregdata = (struct bpo_greg_section_info *)
		bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info));
	      if (gregdata == NULL)
		return FALSE;
	      mmix_elf_section_data (allocated_gregs_section)->bpo.greg
		= gregdata;
	    }
	  else if (gregdata == NULL)
	    gregdata
	      = mmix_elf_section_data (allocated_gregs_section)->bpo.greg;

	  /* Get ourselves some auxiliary info for the BPO-relocs.  */
	  if (bpodata == NULL)
	    {
	      /* No use doing a separate iteration pass to find the upper
		 limit - just use the number of relocs.  */
	      bpodata = (struct bpo_reloc_section_info *)
		bfd_alloc (bpo_greg_owner,
			   sizeof (struct bpo_reloc_section_info)
			   * (sec->reloc_count + 1));
	      if (bpodata == NULL)
		return FALSE;
	      mmix_elf_section_data (sec)->bpo.reloc = bpodata;
	      bpodata->first_base_plus_offset_reloc
		= bpodata->bpo_index
		= gregdata->n_max_bpo_relocs;
	      bpodata->bpo_greg_section
		= allocated_gregs_section;
	      bpodata->n_bpo_relocs_this_section = 0;
	    }

	  bpodata->n_bpo_relocs_this_section++;
	  gregdata->n_max_bpo_relocs++;

	  /* We don't get another chance to set this before GC; we've not
	     set up set up any hook that runs before GC.  */
	  gregdata->n_bpo_relocs
	    = gregdata->n_max_bpo_relocs;
	  break;
	}
    }

  return TRUE;
}

/* Look through the relocs for a section during the first phase.  */

static bfd_boolean
mmix_elf_check_relocs (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;

  if (info->relocateable)
    return TRUE;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf64_External_Sym);
  if (!elf_bad_symtab (abfd))
    sym_hashes_end -= symtab_hdr->sh_info;

  /* First we sort the relocs so that any register relocs come before
     expansion-relocs to the same insn.  FIXME: Not done for mmo.  */
  qsort ((PTR) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
	 mmix_elf_sort_relocs);

  /* Do the common part.  */
  if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs))
    return FALSE;

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

      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];

      switch (ELF64_R_TYPE (rel->r_info))
	{
        /* This relocation describes the C++ object vtable hierarchy.
           Reconstruct it for later use during GC.  */
        case R_MMIX_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_MMIX_GNU_VTENTRY:
          if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
            return FALSE;
          break;
	}
    }

  return TRUE;
}

/* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo.
   Copied from elf_link_add_object_symbols.  */

bfd_boolean
_bfd_mmix_check_all_relocs (abfd, info)
     bfd *abfd;
     struct bfd_link_info *info;
{
  asection *o;

  for (o = abfd->sections; o != NULL; o = o->next)
    {
      Elf_Internal_Rela *internal_relocs;
      bfd_boolean ok;

      if ((o->flags & SEC_RELOC) == 0
	  || o->reloc_count == 0
	  || ((info->strip == strip_all || info->strip == strip_debugger)
	      && (o->flags & SEC_DEBUGGING) != 0)
	  || bfd_is_abs_section (o->output_section))
	continue;

      internal_relocs
	= _bfd_elf64_link_read_relocs (abfd, o, (PTR) NULL,
				       (Elf_Internal_Rela *) NULL,
				       info->keep_memory);
      if (internal_relocs == NULL)
	return FALSE;

      ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs);

      if (! info->keep_memory)
	free (internal_relocs);

      if (! ok)
	return FALSE;
    }

  return TRUE;
}

/* Change symbols relative to the reg contents section to instead be to
   the register section, and scale them down to correspond to the register
   number.  */

static bfd_boolean
mmix_elf_link_output_symbol_hook (abfd, info, name, sym, input_sec)
     bfd *abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *info ATTRIBUTE_UNUSED;
     const char *name ATTRIBUTE_UNUSED;
     Elf_Internal_Sym *sym;
     asection *input_sec;
{
  if (input_sec != NULL
      && input_sec->name != NULL
      && ELF_ST_TYPE (sym->st_info) != STT_SECTION
      && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
    {
      sym->st_value /= 8;
      sym->st_shndx = SHN_REGISTER;
    }

  return TRUE;
}

/* We fake a register section that holds values that are register numbers.
   Having a SHN_REGISTER and register section translates better to other
   formats (e.g. mmo) than for example a STT_REGISTER attribute.
   This section faking is based on a construct in elf32-mips.c.  */
static asection mmix_elf_reg_section;
static asymbol mmix_elf_reg_section_symbol;
static asymbol *mmix_elf_reg_section_symbol_ptr;

/* Handle the special MIPS section numbers that a symbol may use.
   This is used for both the 32-bit and the 64-bit ABI.  */

void
mmix_elf_symbol_processing (abfd, asym)
     bfd *abfd ATTRIBUTE_UNUSED;
     asymbol *asym;
{
  elf_symbol_type *elfsym;

  elfsym = (elf_symbol_type *) asym;
  switch (elfsym->internal_elf_sym.st_shndx)
    {
    case SHN_REGISTER:
      if (mmix_elf_reg_section.name == NULL)
	{
	  /* Initialize the register section.  */
	  mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME;
	  mmix_elf_reg_section.flags = SEC_NO_FLAGS;
	  mmix_elf_reg_section.output_section = &mmix_elf_reg_section;
	  mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol;
	  mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr;
	  mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME;
	  mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM;
	  mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section;
	  mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol;
	}
      asym->section = &mmix_elf_reg_section;
      break;

    default:
      break;
    }
}

/* Given a BFD section, try to locate the corresponding ELF section
   index.  */

static bfd_boolean
mmix_elf_section_from_bfd_section (abfd, sec, retval)
     bfd *                 abfd ATTRIBUTE_UNUSED;
     asection *            sec;
     int *                 retval;
{
  if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0)
    *retval = SHN_REGISTER;
  else
    return FALSE;

  return TRUE;
}

/* Hook called by the linker routine which adds symbols from an object
   file.  We must handle the special SHN_REGISTER section number here.

   We also check that we only have *one* each of the section-start
   symbols, since otherwise having two with the same value would cause
   them to be "merged", but with the contents serialized.  */

bfd_boolean
mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
     bfd *abfd;
     struct bfd_link_info *info ATTRIBUTE_UNUSED;
     const Elf_Internal_Sym *sym;
     const char **namep ATTRIBUTE_UNUSED;
     flagword *flagsp ATTRIBUTE_UNUSED;
     asection **secp;
     bfd_vma *valp ATTRIBUTE_UNUSED;
{
  if (sym->st_shndx == SHN_REGISTER)
    *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
  else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
	   && strncmp (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX,
		       strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) == 0)
    {
      /* See if we have another one.  */
      struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
							    *namep,
							    FALSE,
							    FALSE,
							    FALSE);

      if (h != NULL && h->type != bfd_link_hash_undefined)
	{
	  /* How do we get the asymbol (or really: the filename) from h?
	     h->u.def.section->owner is NULL.  */
	  ((*_bfd_error_handler)
	   (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"),
	    bfd_get_filename (abfd), *namep,
	    *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)));
	   bfd_set_error (bfd_error_bad_value);
	   return FALSE;
	}
    }

  return TRUE;
}

/* We consider symbols matching "L.*:[0-9]+" to be local symbols.  */

bfd_boolean
mmix_elf_is_local_label_name (abfd, name)
     bfd *abfd;
     const char *name;
{
  const char *colpos;
  int digits;

  /* Also include the default local-label definition.  */
  if (_bfd_elf_is_local_label_name (abfd, name))
    return TRUE;

  if (*name != 'L')
    return FALSE;

  /* If there's no ":", or more than one, it's not a local symbol.  */
  colpos = strchr (name, ':');
  if (colpos == NULL || strchr (colpos + 1, ':') != NULL)
    return FALSE;

  /* Check that there are remaining characters and that they are digits.  */
  if (colpos[1] == 0)
    return FALSE;

  digits = strspn (colpos + 1, "0123456789");
  return digits != 0 && colpos[1 + digits] == 0;
}

/* We get rid of the register section here.  */

bfd_boolean
mmix_elf_final_link (abfd, info)
     bfd *abfd;
     struct bfd_link_info *info;
{
  /* We never output a register section, though we create one for
     temporary measures.  Check that nobody entered contents into it.  */
  asection *reg_section;
  asection **secpp;

  reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);

  if (reg_section != NULL)
    {
      /* FIXME: Pass error state gracefully.  */
      if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS)
	_bfd_abort (__FILE__, __LINE__, _("Register section has contents\n"));

      /* Really remove the section.  */
      for (secpp = &abfd->sections;
	   *secpp != reg_section;
	   secpp = &(*secpp)->next)
	;
      bfd_section_list_remove (abfd, secpp);
      --abfd->section_count;
    }

  if (! bfd_elf64_bfd_final_link (abfd, info))
    return FALSE;

  /* Since this section is marked SEC_LINKER_CREATED, it isn't output by
     the regular linker machinery.  We do it here, like other targets with
     special sections.  */
  if (info->base_file != NULL)
    {
      asection *greg_section
	= bfd_get_section_by_name ((bfd *) info->base_file,
				   MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
      if (!bfd_set_section_contents (abfd,
				     greg_section->output_section,
				     greg_section->contents,
				     (file_ptr) greg_section->output_offset,
				     greg_section->_cooked_size))
	return FALSE;
    }
  return TRUE;
}

/* Initialize stuff for the linker-generated GREGs to match
   R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker.  */

bfd_boolean
_bfd_mmix_prepare_linker_allocated_gregs (abfd, info)
     bfd *abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *info;
{
  asection *bpo_gregs_section;
  bfd *bpo_greg_owner;
  struct bpo_greg_section_info *gregdata;
  size_t n_gregs;
  bfd_vma gregs_size;
  size_t i;
  size_t *bpo_reloc_indexes;

  /* The bpo_greg_owner bfd is supposed to have been set by
     mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen.
     If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET.  */
  bpo_greg_owner = (bfd *) info->base_file;
  if (bpo_greg_owner == NULL)
    return TRUE;

  bpo_gregs_section
    = bfd_get_section_by_name (bpo_greg_owner,
			       MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);

  if (bpo_gregs_section == NULL)
    return TRUE;

  /* We use the target-data handle in the ELF section data.  */
  gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
  if (gregdata == NULL)
    return FALSE;

  n_gregs = gregdata->n_bpo_relocs;
  gregdata->n_allocated_bpo_gregs = n_gregs;

  /* When this reaches zero during relaxation, all entries have been
     filled in and the size of the linker gregs can be calculated.  */
  gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs;

  /* Set the zeroth-order estimate for the GREGs size.  */
  gregs_size = n_gregs * 8;

  if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size))
    return FALSE;

  /* Allocate and set up the GREG arrays.  They're filled in at relaxation
     time.  Note that we must use the max number ever noted for the array,
     since the index numbers were created before GC.  */
  gregdata->reloc_request
    = bfd_zalloc (bpo_greg_owner,
		  sizeof (struct bpo_reloc_request)
		  * gregdata->n_max_bpo_relocs);

  gregdata->bpo_reloc_indexes
    = bpo_reloc_indexes
    = bfd_alloc (bpo_greg_owner,
		 gregdata->n_max_bpo_relocs
		 * sizeof (size_t));
  if (bpo_reloc_indexes == NULL)
    return FALSE;

  /* The default order is an identity mapping.  */
  for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
    {
      bpo_reloc_indexes[i] = i;
      gregdata->reloc_request[i].bpo_reloc_no = i;
    }

  return TRUE;
}

/* Fill in contents in the linker allocated gregs.  Everything is
   calculated at this point; we just move the contents into place here.  */

bfd_boolean
_bfd_mmix_finalize_linker_allocated_gregs (abfd, link_info)
     bfd *abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *link_info;
{
  asection *bpo_gregs_section;
  bfd *bpo_greg_owner;
  struct bpo_greg_section_info *gregdata;
  size_t n_gregs;
  size_t i, j;
  size_t lastreg;
  bfd_byte *contents;

  /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs
     when the first R_MMIX_BASE_PLUS_OFFSET is seen.  If there is no such
     object, there was no R_MMIX_BASE_PLUS_OFFSET.  */
  bpo_greg_owner = (bfd *) link_info->base_file;
  if (bpo_greg_owner == NULL)
    return TRUE;

  bpo_gregs_section
    = bfd_get_section_by_name (bpo_greg_owner,
			       MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);

  /* This can't happen without DSO handling.  When DSOs are handled
     without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such
     section.  */
  if (bpo_gregs_section == NULL)
    return TRUE;

  /* We use the target-data handle in the ELF section data.  */

  gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
  if (gregdata == NULL)
    return FALSE;

  n_gregs = gregdata->n_allocated_bpo_gregs;

  /* We need to have a _raw_size contents even though there's only
     _cooked_size worth of data, since the generic relocation machinery
     will allocate and copy that much temporarily.  */
  bpo_gregs_section->contents
    = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->_raw_size);
  if (contents == NULL)
    return FALSE;

  /* Sanity check: If these numbers mismatch, some relocation has not been
     accounted for and the rest of gregdata is probably inconsistent.
     It's a bug, but it's more helpful to identify it than segfaulting
     below.  */
  if (gregdata->n_remaining_bpo_relocs_this_relaxation_round
      != gregdata->n_bpo_relocs)
    {
      (*_bfd_error_handler)
	(_("Internal inconsistency: remaining %u != max %u.\n\
  Please report this bug."),
	 gregdata->n_remaining_bpo_relocs_this_relaxation_round,
	 gregdata->n_bpo_relocs);
      return FALSE;
    }

  for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++)
    if (gregdata->reloc_request[i].regindex != lastreg)
      {
	bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value,
		    contents + j * 8);
	lastreg = gregdata->reloc_request[i].regindex;
	j++;
      }

  return TRUE;
}

/* Sort valid relocs to come before non-valid relocs, then on increasing
   value.  */

static int
bpo_reloc_request_sort_fn (p1, p2)
     const PTR p1;
     const PTR p2;
{
  const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1;
  const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2;

  /* Primary function is validity; non-valid relocs sorted after valid
     ones.  */
  if (r1->valid != r2->valid)
    return r2->valid - r1->valid;

  /* Then sort on value.  Don't simplify and return just the difference of
     the values: the upper bits of the 64-bit value would be truncated on
     a host with 32-bit ints.  */
  if (r1->value != r2->value)
    return r1->value > r2->value ? 1 : -1;

  /* As a last re-sort, use the relocation number, so we get a stable
     sort.  The *addresses* aren't stable since items are swapped during
     sorting.  It depends on the qsort implementation if this actually
     happens.  */
  return r1->bpo_reloc_no > r2->bpo_reloc_no
    ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0);
}

/* For debug use only.  Dumps the global register allocations resulting
   from base-plus-offset relocs.  */

void
mmix_dump_bpo_gregs (link_info, pf)
     struct bfd_link_info *link_info;
     bfd_error_handler_type pf;
{
  bfd *bpo_greg_owner;
  asection *bpo_gregs_section;
  struct bpo_greg_section_info *gregdata;
  unsigned int i;

  if (link_info == NULL || link_info->base_file == NULL)
    return;

  bpo_greg_owner = (bfd *) link_info->base_file;

  bpo_gregs_section
    = bfd_get_section_by_name (bpo_greg_owner,
			       MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);

  if (bpo_gregs_section == NULL)
    return;

  gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
  if (gregdata == NULL)
    return;

  if (pf == NULL)
    pf = _bfd_error_handler;

  /* These format strings are not translated.  They are for debug purposes
     only and never displayed to an end user.  Should they escape, we
     surely want them in original.  */
  (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\
 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs,
     gregdata->n_max_bpo_relocs,
     gregdata->n_remaining_bpo_relocs_this_relaxation_round,
     gregdata->n_allocated_bpo_gregs);

  if (gregdata->reloc_request)
    for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
      (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx  r: %3u o: %3u\n",
	     i,
	     (gregdata->bpo_reloc_indexes != NULL
	      ? gregdata->bpo_reloc_indexes[i] : (size_t) -1),
	     gregdata->reloc_request[i].bpo_reloc_no,
	     gregdata->reloc_request[i].valid,

	     (unsigned long) (gregdata->reloc_request[i].value >> 32),
	     (unsigned long) gregdata->reloc_request[i].value,
	     gregdata->reloc_request[i].regindex,
	     gregdata->reloc_request[i].offset);
}

/* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and
   when the last such reloc is done, an index-array is sorted according to
   the values and iterated over to produce register numbers (indexed by 0
   from the first allocated register number) and offsets for use in real
   relocation.

   Symbol- and reloc-reading infrastructure copied from elf-m10200.c.  */

static bfd_boolean
mmix_elf_relax_section (abfd, sec, link_info, again)
     bfd *abfd;
     asection *sec;
     struct bfd_link_info *link_info;
     bfd_boolean *again;
{
  Elf_Internal_Shdr *symtab_hdr;
  Elf_Internal_Rela *internal_relocs;
  Elf_Internal_Rela *irel, *irelend;
  asection *bpo_gregs_section = NULL;
  struct bpo_greg_section_info *gregdata;
  struct bpo_reloc_section_info *bpodata
    = mmix_elf_section_data (sec)->bpo.reloc;
  size_t bpono;
  bfd *bpo_greg_owner;
  Elf_Internal_Sym *isymbuf = NULL;

  /* Assume nothing changes.  */
  *again = FALSE;

  /* If this is the first time we have been called for this section,
     initialize the cooked size.  */
  if (sec->_cooked_size == 0)
    sec->_cooked_size = sec->_raw_size;

  /* We don't have to do anything for a relocateable link, if
     this section does not have relocs, or if this is not a
     code section.  */
  if (link_info->relocateable
      || (sec->flags & SEC_RELOC) == 0
      || sec->reloc_count == 0
      || (sec->flags & SEC_CODE) == 0
      || (sec->flags & SEC_LINKER_CREATED) != 0
      /* If no R_MMIX_BASE_PLUS_OFFSET relocs, then nothing to do.  */
      || bpodata == NULL)
    return TRUE;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;

  bpo_greg_owner = (bfd *) link_info->base_file;
  bpo_gregs_section = bpodata->bpo_greg_section;
  gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;

  bpono = bpodata->first_base_plus_offset_reloc;

  /* Get a copy of the native relocations.  */
  internal_relocs
    = _bfd_elf64_link_read_relocs (abfd, sec, (PTR) NULL,
				   (Elf_Internal_Rela *) NULL,
				   link_info->keep_memory);
  if (internal_relocs == NULL)
    goto error_return;

  /* Walk through them looking for relaxing opportunities.  */
  irelend = internal_relocs + sec->reloc_count;
  for (irel = internal_relocs; irel < irelend; irel++)
    {
      bfd_vma symval;

      if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET)
	continue;

      /* Get the value of the symbol referred to by the reloc.  */
      if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
	{
	  /* A local symbol.  */
	  Elf_Internal_Sym *isym;
	  asection *sym_sec;

	  /* Read this BFD's local symbols if we haven't already.  */
	  if (isymbuf == NULL)
	    {
	      isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
	      if (isymbuf == NULL)
		isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
						symtab_hdr->sh_info, 0,
						NULL, NULL, NULL);
	      if (isymbuf == 0)
		goto error_return;
	    }

	  isym = isymbuf + ELF64_R_SYM (irel->r_info);
	  if (isym->st_shndx == SHN_UNDEF)
	    sym_sec = bfd_und_section_ptr;
	  else if (isym->st_shndx == SHN_ABS)
	    sym_sec = bfd_abs_section_ptr;
	  else if (isym->st_shndx == SHN_COMMON)
	    sym_sec = bfd_com_section_ptr;
	  else
	    sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
	  symval = (isym->st_value
		    + sym_sec->output_section->vma
		    + sym_sec->output_offset);
	}
      else
	{
	  unsigned long indx;
	  struct elf_link_hash_entry *h;

	  /* An external symbol.  */
	  indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info;
	  h = elf_sym_hashes (abfd)[indx];
	  BFD_ASSERT (h != NULL);
	  if (h->root.type != bfd_link_hash_defined
	      && h->root.type != bfd_link_hash_defweak)
	    {
	      /* This appears to be a reference to an undefined symbol.
		 Just ignore it--it will be caught by the regular reloc
		 processing.  We need to keep BPO reloc accounting
		 consistent, though.  */
	      gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
	      bpono++;
	      continue;
	    }

	  symval = (h->root.u.def.value
		    + h->root.u.def.section->output_section->vma
		    + h->root.u.def.section->output_offset);
	}

      gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value
	= symval + irel->r_addend;
      gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE;
      gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
    }

  /* Check if that was the last BPO-reloc.  If so, sort the values and
     calculate how many registers we need to cover them.  Set the size of
     the linker gregs, and if the number of registers changed, indicate
     that we need to relax some more because we have more work to do.  */
  if (gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0)
    {
      size_t i;
      bfd_vma prev_base;
      size_t regindex;

      /* First, reset the remaining relocs for the next round.  */
      gregdata->n_remaining_bpo_relocs_this_relaxation_round
	= gregdata->n_bpo_relocs;

      qsort ((PTR) gregdata->reloc_request,
	     gregdata->n_max_bpo_relocs,
	     sizeof (struct bpo_reloc_request),
	     bpo_reloc_request_sort_fn);

      /* Recalculate indexes.  When we find a change (however unlikely
	 after the initial iteration), we know we need to relax again,
	 since items in the GREG-array are sorted by increasing value and
	 stored in the relaxation phase.  */
      for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
	if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
	    != i)
	  {
	    gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
	      = i;
	    *again = TRUE;
	  }

      /* Allocate register numbers (indexing from 0).  Stop at the first
	 non-valid reloc.  */
      for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value;
	   i < gregdata->n_bpo_relocs;
	   i++)
	{
	  if (gregdata->reloc_request[i].value > prev_base + 255)
	    {
	      regindex++;
	      prev_base = gregdata->reloc_request[i].value;
	    }
	  gregdata->reloc_request[i].regindex = regindex;
	  gregdata->reloc_request[i].offset
	    = gregdata->reloc_request[i].value - prev_base;
	}

      /* If it's not the same as the last time, we need to relax again,
	 because the size of the section has changed.  I'm not sure we
	 actually need to do any adjustments since the shrinking happens
	 at the start of this section, but better safe than sorry.  */
      if (gregdata->n_allocated_bpo_gregs != regindex + 1)
	{
	  gregdata->n_allocated_bpo_gregs = regindex + 1;
	  *again = TRUE;
	}

      bpo_gregs_section->_cooked_size = (regindex + 1) * 8;
    }

  if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
    {
      if (! link_info->keep_memory)
	free (isymbuf);
      else
	{
	  /* Cache the symbols for elf_link_input_bfd.  */
	  symtab_hdr->contents = (unsigned char *) isymbuf;
	}
    }

  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);

  return TRUE;

 error_return:
  if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
    free (isymbuf);
  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);
  return FALSE;
}

#define ELF_ARCH		bfd_arch_mmix
#define ELF_MACHINE_CODE 	EM_MMIX

/* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL).
   However, that's too much for something somewhere in the linker part of
   BFD; perhaps the start-address has to be a non-zero multiple of this
   number, or larger than this number.  The symptom is that the linker
   complains: "warning: allocated section `.text' not in segment".  We
   settle for 64k; the page-size used in examples is 8k.
   #define ELF_MAXPAGESIZE 0x10000

   Unfortunately, this causes excessive padding in the supposedly small
   for-education programs that are the expected usage (where people would
   inspect output).  We stick to 256 bytes just to have *some* default
   alignment.  */
#define ELF_MAXPAGESIZE 0x100

#define TARGET_BIG_SYM		bfd_elf64_mmix_vec
#define TARGET_BIG_NAME		"elf64-mmix"

#define elf_info_to_howto_rel		NULL
#define elf_info_to_howto		mmix_info_to_howto_rela
#define elf_backend_relocate_section	mmix_elf_relocate_section
#define elf_backend_gc_mark_hook	mmix_elf_gc_mark_hook
#define elf_backend_gc_sweep_hook	mmix_elf_gc_sweep_hook

#define elf_backend_link_output_symbol_hook \
	mmix_elf_link_output_symbol_hook
#define elf_backend_add_symbol_hook	mmix_elf_add_symbol_hook

#define elf_backend_check_relocs	mmix_elf_check_relocs
#define elf_backend_symbol_processing	mmix_elf_symbol_processing

#define bfd_elf64_bfd_is_local_label_name \
	mmix_elf_is_local_label_name

#define elf_backend_may_use_rel_p	0
#define elf_backend_may_use_rela_p	1
#define elf_backend_default_use_rela_p	1

#define elf_backend_can_gc_sections	1
#define elf_backend_section_from_bfd_section \
	mmix_elf_section_from_bfd_section

#define bfd_elf64_new_section_hook	mmix_elf_new_section_hook
#define bfd_elf64_bfd_final_link	mmix_elf_final_link
#define bfd_elf64_bfd_relax_section	mmix_elf_relax_section

#include "elf64-target.h"