summaryrefslogtreecommitdiff
path: root/bfd/coff-mips.c
blob: d89db54c3b96bfbc3a35d6ffd6067960ddedad2b (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
/* BFD back-end for MIPS Extended-Coff files.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001, 2002, 2003, 2004
   Free Software Foundation, Inc.
   Original version by Per Bothner.
   Full support added by Ian Lance Taylor, ian@cygnus.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.  */

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "coff/internal.h"
#include "coff/sym.h"
#include "coff/symconst.h"
#include "coff/ecoff.h"
#include "coff/mips.h"
#include "libcoff.h"
#include "libecoff.h"

/* Prototypes for static functions.  */

static bfd_boolean mips_ecoff_bad_format_hook
  PARAMS ((bfd *abfd, PTR filehdr));
static void mips_ecoff_swap_reloc_in
  PARAMS ((bfd *, PTR, struct internal_reloc *));
static void mips_ecoff_swap_reloc_out
  PARAMS ((bfd *, const struct internal_reloc *, PTR));
static void mips_adjust_reloc_in
  PARAMS ((bfd *, const struct internal_reloc *, arelent *));
static void mips_adjust_reloc_out
  PARAMS ((bfd *, const arelent *, struct internal_reloc *));
static bfd_reloc_status_type mips_generic_reloc
  PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data,
	   asection *section, bfd *output_bfd, char **error));
static bfd_reloc_status_type mips_refhi_reloc
  PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data,
	   asection *section, bfd *output_bfd, char **error));
static bfd_reloc_status_type mips_reflo_reloc
  PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data,
	   asection *section, bfd *output_bfd, char **error));
static bfd_reloc_status_type mips_gprel_reloc
  PARAMS ((bfd *abfd, arelent *reloc, asymbol *symbol, PTR data,
	   asection *section, bfd *output_bfd, char **error));
static void mips_relocate_hi
  PARAMS ((struct internal_reloc *refhi, struct internal_reloc *reflo,
	   bfd *input_bfd, asection *input_section, bfd_byte *contents,
	   bfd_vma relocation));
static bfd_boolean mips_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, PTR));
static reloc_howto_type *mips_bfd_reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));

/* ECOFF has COFF sections, but the debugging information is stored in
   a completely different format.  ECOFF targets use some of the
   swapping routines from coffswap.h, and some of the generic COFF
   routines in coffgen.c, but, unlike the real COFF targets, do not
   use coffcode.h itself.

   Get the generic COFF swapping routines, except for the reloc,
   symbol, and lineno ones.  Give them ECOFF names.  */
#define MIPSECOFF
#define NO_COFF_RELOCS
#define NO_COFF_SYMBOLS
#define NO_COFF_LINENOS
#define coff_swap_filehdr_in mips_ecoff_swap_filehdr_in
#define coff_swap_filehdr_out mips_ecoff_swap_filehdr_out
#define coff_swap_aouthdr_in mips_ecoff_swap_aouthdr_in
#define coff_swap_aouthdr_out mips_ecoff_swap_aouthdr_out
#define coff_swap_scnhdr_in mips_ecoff_swap_scnhdr_in
#define coff_swap_scnhdr_out mips_ecoff_swap_scnhdr_out
#include "coffswap.h"

/* Get the ECOFF swapping routines.  */
#define ECOFF_32
#include "ecoffswap.h"

/* How to process the various relocs types.  */

static reloc_howto_type mips_howto_table[] =
{
  /* Reloc type 0 is ignored.  The reloc reading code ensures that
     this is a reference to the .abs section, which will cause
     bfd_perform_relocation to do nothing.  */
  HOWTO (MIPS_R_IGNORE,	/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 0,			/* special_function */
	 "IGNORE",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 16 bit reference to a symbol, normally from a data section.  */
  HOWTO (MIPS_R_REFHALF,	/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 mips_generic_reloc,	/* special_function */
	 "REFHALF",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 32 bit reference to a symbol, normally from a data section.  */
  HOWTO (MIPS_R_REFWORD,	/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 mips_generic_reloc,	/* special_function */
	 "REFWORD",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 26 bit absolute jump address.  */
  HOWTO (MIPS_R_JMPADDR,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 26,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 			/* This needs complex overflow
				   detection, because the upper four
				   bits must match the PC.  */
	 mips_generic_reloc,	/* special_function */
	 "JMPADDR",		/* name */
	 TRUE,			/* partial_inplace */
	 0x3ffffff,		/* src_mask */
	 0x3ffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* The high 16 bits of a symbol value.  Handled by the function
     mips_refhi_reloc.  */
  HOWTO (MIPS_R_REFHI,		/* type */
	 16,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 mips_refhi_reloc,	/* special_function */
	 "REFHI",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* The low 16 bits of a symbol value.  */
  HOWTO (MIPS_R_REFLO,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 mips_reflo_reloc,	/* special_function */
	 "REFLO",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A reference to an offset from the gp register.  Handled by the
     function mips_gprel_reloc.  */
  HOWTO (MIPS_R_GPREL,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mips_gprel_reloc,	/* special_function */
	 "GPREL",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A reference to a literal using an offset from the gp register.
     Handled by the function mips_gprel_reloc.  */
  HOWTO (MIPS_R_LITERAL,	/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mips_gprel_reloc,	/* special_function */
	 "LITERAL",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  EMPTY_HOWTO (8),
  EMPTY_HOWTO (9),
  EMPTY_HOWTO (10),
  EMPTY_HOWTO (11),

  /* FIXME: This relocation is used (internally only) to represent branches
     when assembling.  It should never appear in output files, and
     be removed.  (It used to be used for embedded-PIC support.)  */
  HOWTO (MIPS_R_PCREL16,	/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 mips_generic_reloc,	/* special_function */
	 "PCREL16",		/* name */
	 TRUE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */
};

#define MIPS_HOWTO_COUNT \
  (sizeof mips_howto_table / sizeof mips_howto_table[0])

/* See whether the magic number matches.  */

static bfd_boolean
mips_ecoff_bad_format_hook (abfd, filehdr)
     bfd *abfd;
     PTR filehdr;
{
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;

  switch (internal_f->f_magic)
    {
    case MIPS_MAGIC_1:
      /* I don't know what endianness this implies.  */
      return TRUE;

    case MIPS_MAGIC_BIG:
    case MIPS_MAGIC_BIG2:
    case MIPS_MAGIC_BIG3:
      return bfd_big_endian (abfd);

    case MIPS_MAGIC_LITTLE:
    case MIPS_MAGIC_LITTLE2:
    case MIPS_MAGIC_LITTLE3:
      return bfd_little_endian (abfd);

    default:
      return FALSE;
    }
}

/* Reloc handling.  MIPS ECOFF relocs are packed into 8 bytes in
   external form.  They use a bit which indicates whether the symbol
   is external.  */

/* Swap a reloc in.  */

static void
mips_ecoff_swap_reloc_in (abfd, ext_ptr, intern)
     bfd *abfd;
     PTR ext_ptr;
     struct internal_reloc *intern;
{
  const RELOC *ext = (RELOC *) ext_ptr;

  intern->r_vaddr = H_GET_32 (abfd, ext->r_vaddr);
  if (bfd_header_big_endian (abfd))
    {
      intern->r_symndx = (((int) ext->r_bits[0]
			   << RELOC_BITS0_SYMNDX_SH_LEFT_BIG)
			  | ((int) ext->r_bits[1]
			     << RELOC_BITS1_SYMNDX_SH_LEFT_BIG)
			  | ((int) ext->r_bits[2]
			     << RELOC_BITS2_SYMNDX_SH_LEFT_BIG));
      intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_BIG)
			>> RELOC_BITS3_TYPE_SH_BIG);
      intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0;
    }
  else
    {
      intern->r_symndx = (((int) ext->r_bits[0]
			   << RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE)
			  | ((int) ext->r_bits[1]
			     << RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE)
			  | ((int) ext->r_bits[2]
			     << RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE));
      intern->r_type = (((ext->r_bits[3] & RELOC_BITS3_TYPE_LITTLE)
			 >> RELOC_BITS3_TYPE_SH_LITTLE)
			| ((ext->r_bits[3] & RELOC_BITS3_TYPEHI_LITTLE)
			   << RELOC_BITS3_TYPEHI_SH_LITTLE));
      intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0;
    }
}

/* Swap a reloc out.  */

static void
mips_ecoff_swap_reloc_out (abfd, intern, dst)
     bfd *abfd;
     const struct internal_reloc *intern;
     PTR dst;
{
  RELOC *ext = (RELOC *) dst;
  long r_symndx;

  BFD_ASSERT (intern->r_extern
	      || (intern->r_symndx >= 0 && intern->r_symndx <= 12));

  r_symndx = intern->r_symndx;

  H_PUT_32 (abfd, intern->r_vaddr, ext->r_vaddr);
  if (bfd_header_big_endian (abfd))
    {
      ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_BIG;
      ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_BIG;
      ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_BIG;
      ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_BIG)
			 & RELOC_BITS3_TYPE_BIG)
			| (intern->r_extern ? RELOC_BITS3_EXTERN_BIG : 0));
    }
  else
    {
      ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE;
      ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE;
      ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE;
      ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_LITTLE)
			 & RELOC_BITS3_TYPE_LITTLE)
			| ((intern->r_type >> RELOC_BITS3_TYPEHI_SH_LITTLE
			    & RELOC_BITS3_TYPEHI_LITTLE))
			| (intern->r_extern ? RELOC_BITS3_EXTERN_LITTLE : 0));
    }
}

/* Finish canonicalizing a reloc.  Part of this is generic to all
   ECOFF targets, and that part is in ecoff.c.  The rest is done in
   this backend routine.  It must fill in the howto field.  */

static void
mips_adjust_reloc_in (abfd, intern, rptr)
     bfd *abfd;
     const struct internal_reloc *intern;
     arelent *rptr;
{
  if (intern->r_type > MIPS_R_PCREL16)
    abort ();

  if (! intern->r_extern
      && (intern->r_type == MIPS_R_GPREL
	  || intern->r_type == MIPS_R_LITERAL))
    rptr->addend += ecoff_data (abfd)->gp;

  /* If the type is MIPS_R_IGNORE, make sure this is a reference to
     the absolute section so that the reloc is ignored.  */
  if (intern->r_type == MIPS_R_IGNORE)
    rptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;

  rptr->howto = &mips_howto_table[intern->r_type];
}

/* Make any adjustments needed to a reloc before writing it out.  None
   are needed for MIPS.  */

static void
mips_adjust_reloc_out (abfd, rel, intern)
     bfd *abfd ATTRIBUTE_UNUSED;
     const arelent *rel ATTRIBUTE_UNUSED;
     struct internal_reloc *intern ATTRIBUTE_UNUSED;
{
}

/* ECOFF relocs are either against external symbols, or against
   sections.  If we are producing relocatable output, and the reloc
   is against an external symbol, and nothing has given us any
   additional addend, the resulting reloc will also be against the
   same symbol.  In such a case, we don't want to change anything
   about the way the reloc is handled, since it will all be done at
   final link time.  Rather than put special case code into
   bfd_perform_relocation, all the reloc types use this howto
   function.  It just short circuits the reloc if producing
   relocatable output against an external symbol.  */

static bfd_reloc_status_type
mips_generic_reloc (abfd,
		    reloc_entry,
		    symbol,
		    data,
		    input_section,
		    output_bfd,
		    error_message)
     bfd *abfd ATTRIBUTE_UNUSED;
     arelent *reloc_entry;
     asymbol *symbol;
     PTR data ATTRIBUTE_UNUSED;
     asection *input_section;
     bfd *output_bfd;
     char **error_message ATTRIBUTE_UNUSED;
{
  if (output_bfd != (bfd *) NULL
      && (symbol->flags & BSF_SECTION_SYM) == 0
      && reloc_entry->addend == 0)
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }

  return bfd_reloc_continue;
}

/* Do a REFHI relocation.  This has to be done in combination with a
   REFLO reloc, because there is a carry from the REFLO to the REFHI.
   Here we just save the information we need; we do the actual
   relocation when we see the REFLO.  MIPS ECOFF requires that the
   REFLO immediately follow the REFHI.  As a GNU extension, we permit
   an arbitrary number of HI relocs to be associated with a single LO
   reloc.  This extension permits gcc to output the HI and LO relocs
   itself.  */

struct mips_hi
{
  struct mips_hi *next;
  bfd_byte *addr;
  bfd_vma addend;
};

/* FIXME: This should not be a static variable.  */

static struct mips_hi *mips_refhi_list;

static bfd_reloc_status_type
mips_refhi_reloc (abfd,
		  reloc_entry,
		  symbol,
		  data,
		  input_section,
		  output_bfd,
		  error_message)
     bfd *abfd ATTRIBUTE_UNUSED;
     arelent *reloc_entry;
     asymbol *symbol;
     PTR data;
     asection *input_section;
     bfd *output_bfd;
     char **error_message ATTRIBUTE_UNUSED;
{
  bfd_reloc_status_type ret;
  bfd_vma relocation;
  struct mips_hi *n;

  /* If we're relocating, and this an external symbol, we don't want
     to change anything.  */
  if (output_bfd != (bfd *) NULL
      && (symbol->flags & BSF_SECTION_SYM) == 0
      && reloc_entry->addend == 0)
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }

  ret = bfd_reloc_ok;
  if (bfd_is_und_section (symbol->section)
      && output_bfd == (bfd *) NULL)
    ret = bfd_reloc_undefined;

  if (bfd_is_com_section (symbol->section))
    relocation = 0;
  else
    relocation = symbol->value;

  relocation += symbol->section->output_section->vma;
  relocation += symbol->section->output_offset;
  relocation += reloc_entry->addend;

  if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
    return bfd_reloc_outofrange;

  /* Save the information, and let REFLO do the actual relocation.  */
  n = (struct mips_hi *) bfd_malloc ((bfd_size_type) sizeof *n);
  if (n == NULL)
    return bfd_reloc_outofrange;
  n->addr = (bfd_byte *) data + reloc_entry->address;
  n->addend = relocation;
  n->next = mips_refhi_list;
  mips_refhi_list = n;

  if (output_bfd != (bfd *) NULL)
    reloc_entry->address += input_section->output_offset;

  return ret;
}

/* Do a REFLO relocation.  This is a straightforward 16 bit inplace
   relocation; this function exists in order to do the REFHI
   relocation described above.  */

static bfd_reloc_status_type
mips_reflo_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;
{
  if (mips_refhi_list != NULL)
    {
      struct mips_hi *l;

      l = mips_refhi_list;
      while (l != NULL)
	{
	  unsigned long insn;
	  unsigned long val;
	  unsigned long vallo;
	  struct mips_hi *next;

	  /* Do the REFHI relocation.  Note that we actually don't
	     need to know anything about the REFLO itself, except
	     where to find the low 16 bits of the addend needed by the
	     REFHI.  */
	  insn = bfd_get_32 (abfd, l->addr);
	  vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address)
		   & 0xffff);
	  val = ((insn & 0xffff) << 16) + vallo;
	  val += l->addend;

	  /* The low order 16 bits are always treated as a signed
	     value.  Therefore, a negative value in the low order bits
	     requires an adjustment in the high order bits.  We need
	     to make this adjustment in two ways: once for the bits we
	     took from the data, and once for the bits we are putting
	     back in to the data.  */
	  if ((vallo & 0x8000) != 0)
	    val -= 0x10000;
	  if ((val & 0x8000) != 0)
	    val += 0x10000;

	  insn = (insn &~ (unsigned) 0xffff) | ((val >> 16) & 0xffff);
	  bfd_put_32 (abfd, (bfd_vma) insn, l->addr);

	  next = l->next;
	  free (l);
	  l = next;
	}

      mips_refhi_list = NULL;
    }

  /* Now do the REFLO reloc in the usual way.  */
  return mips_generic_reloc (abfd, reloc_entry, symbol, data,
			      input_section, output_bfd, error_message);
}

/* Do a GPREL relocation.  This is a 16 bit value which must become
   the offset from the gp register.  */

static bfd_reloc_status_type
mips_gprel_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;
{
  bfd_boolean relocatable;
  bfd_vma gp;
  bfd_vma relocation;
  unsigned long val;
  unsigned long insn;

  /* If we're relocating, and this is an external symbol with no
     addend, we don't want to change anything.  We will only have an
     addend if this is a newly created reloc, not read from an ECOFF
     file.  */
  if (output_bfd != (bfd *) NULL
      && (symbol->flags & BSF_SECTION_SYM) == 0
      && reloc_entry->addend == 0)
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }

  if (output_bfd != (bfd *) NULL)
    relocatable = TRUE;
  else
    {
      relocatable = FALSE;
      output_bfd = symbol->section->output_section->owner;
    }

  if (bfd_is_und_section (symbol->section) && ! relocatable)
    return bfd_reloc_undefined;

  /* We have to figure out the gp value, so that we can adjust the
     symbol value correctly.  We look up the symbol _gp in the output
     BFD.  If we can't find it, we're stuck.  We cache it in the ECOFF
     target data.  We don't need to adjust the symbol value for an
     external symbol if we are producing relocatable output.  */
  gp = _bfd_get_gp_value (output_bfd);
  if (gp == 0
      && (! relocatable
	  || (symbol->flags & BSF_SECTION_SYM) != 0))
    {
      if (relocatable)
	{
	  /* Make up a value.  */
	  gp = symbol->section->output_section->vma + 0x4000;
	  _bfd_set_gp_value (output_bfd, gp);
	}
      else
	{
	  unsigned int count;
	  asymbol **sym;
	  unsigned int i;

	  count = bfd_get_symcount (output_bfd);
	  sym = bfd_get_outsymbols (output_bfd);

	  if (sym == (asymbol **) NULL)
	    i = count;
	  else
	    {
	      for (i = 0; i < count; i++, sym++)
		{
		  register const char *name;

		  name = bfd_asymbol_name (*sym);
		  if (*name == '_' && strcmp (name, "_gp") == 0)
		    {
		      gp = bfd_asymbol_value (*sym);
		      _bfd_set_gp_value (output_bfd, gp);
		      break;
		    }
		}
	    }

	  if (i >= count)
	    {
	      /* Only get the error once.  */
	      gp = 4;
	      _bfd_set_gp_value (output_bfd, gp);
	      *error_message =
		(char *) _("GP relative relocation when _gp not defined");
	      return bfd_reloc_dangerous;
	    }
	}
    }

  if (bfd_is_com_section (symbol->section))
    relocation = 0;
  else
    relocation = symbol->value;

  relocation += symbol->section->output_section->vma;
  relocation += symbol->section->output_offset;

  if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
    return bfd_reloc_outofrange;

  insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);

  /* Set val to the offset into the section or symbol.  */
  val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff;
  if (val & 0x8000)
    val -= 0x10000;

  /* Adjust val for the final section location and GP value.  If we
     are producing relocatable output, we don't want to do this for
     an external symbol.  */
  if (! relocatable
      || (symbol->flags & BSF_SECTION_SYM) != 0)
    val += relocation - gp;

  insn = (insn &~ (unsigned) 0xffff) | (val & 0xffff);
  bfd_put_32 (abfd, (bfd_vma) insn, (bfd_byte *) data + reloc_entry->address);

  if (relocatable)
    reloc_entry->address += input_section->output_offset;

  /* Make sure it fit in 16 bits.  */
  if ((long) val >= 0x8000 || (long) val < -0x8000)
    return bfd_reloc_overflow;

  return bfd_reloc_ok;
}

/* Get the howto structure for a generic reloc type.  */

static reloc_howto_type *
mips_bfd_reloc_type_lookup (abfd, code)
     bfd *abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  int mips_type;

  switch (code)
    {
    case BFD_RELOC_16:
      mips_type = MIPS_R_REFHALF;
      break;
    case BFD_RELOC_32:
    case BFD_RELOC_CTOR:
      mips_type = MIPS_R_REFWORD;
      break;
    case BFD_RELOC_MIPS_JMP:
      mips_type = MIPS_R_JMPADDR;
      break;
    case BFD_RELOC_HI16_S:
      mips_type = MIPS_R_REFHI;
      break;
    case BFD_RELOC_LO16:
      mips_type = MIPS_R_REFLO;
      break;
    case BFD_RELOC_GPREL16:
      mips_type = MIPS_R_GPREL;
      break;
    case BFD_RELOC_MIPS_LITERAL:
      mips_type = MIPS_R_LITERAL;
      break;
    case BFD_RELOC_16_PCREL_S2:
      mips_type = MIPS_R_PCREL16;
      break;
    default:
      return (reloc_howto_type *) NULL;
    }

  return &mips_howto_table[mips_type];
}

/* A helper routine for mips_relocate_section which handles the REFHI
   relocations.  The REFHI relocation must be followed by a REFLO
   relocation, and the addend used is formed from the addends of both
   instructions.  */

static void
mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents,
		  relocation)
     struct internal_reloc *refhi;
     struct internal_reloc *reflo;
     bfd *input_bfd;
     asection *input_section;
     bfd_byte *contents;
     bfd_vma relocation;
{
  unsigned long insn;
  unsigned long val;
  unsigned long vallo;

  if (refhi == NULL)
    return;

  insn = bfd_get_32 (input_bfd,
		     contents + refhi->r_vaddr - input_section->vma);
  if (reflo == NULL)
    vallo = 0;
  else
    vallo = (bfd_get_32 (input_bfd,
			 contents + reflo->r_vaddr - input_section->vma)
	     & 0xffff);

  val = ((insn & 0xffff) << 16) + vallo;
  val += relocation;

  /* The low order 16 bits are always treated as a signed value.
     Therefore, a negative value in the low order bits requires an
     adjustment in the high order bits.  We need to make this
     adjustment in two ways: once for the bits we took from the data,
     and once for the bits we are putting back in to the data.  */
  if ((vallo & 0x8000) != 0)
    val -= 0x10000;

  if ((val & 0x8000) != 0)
    val += 0x10000;

  insn = (insn &~ (unsigned) 0xffff) | ((val >> 16) & 0xffff);
  bfd_put_32 (input_bfd, (bfd_vma) insn,
	      contents + refhi->r_vaddr - input_section->vma);
}

/* Relocate a section while linking a MIPS ECOFF file.  */

static bfd_boolean
mips_relocate_section (output_bfd, info, input_bfd, input_section,
		       contents, external_relocs)
     bfd *output_bfd;
     struct bfd_link_info *info;
     bfd *input_bfd;
     asection *input_section;
     bfd_byte *contents;
     PTR external_relocs;
{
  asection **symndx_to_section;
  struct ecoff_link_hash_entry **sym_hashes;
  bfd_vma gp;
  bfd_boolean gp_undefined;
  struct external_reloc *ext_rel;
  struct external_reloc *ext_rel_end;
  unsigned int i;
  bfd_boolean got_lo;
  struct internal_reloc lo_int_rel;
  bfd_size_type amt;

  BFD_ASSERT (input_bfd->xvec->byteorder
	      == output_bfd->xvec->byteorder);

  /* We keep a table mapping the symndx found in an internal reloc to
     the appropriate section.  This is faster than looking up the
     section by name each time.  */
  symndx_to_section = ecoff_data (input_bfd)->symndx_to_section;
  if (symndx_to_section == (asection **) NULL)
    {
      amt = NUM_RELOC_SECTIONS * sizeof (asection *);
      symndx_to_section = (asection **) bfd_alloc (input_bfd, amt);
      if (!symndx_to_section)
	return FALSE;

      symndx_to_section[RELOC_SECTION_NONE] = NULL;
      symndx_to_section[RELOC_SECTION_TEXT] =
	bfd_get_section_by_name (input_bfd, ".text");
      symndx_to_section[RELOC_SECTION_RDATA] =
	bfd_get_section_by_name (input_bfd, ".rdata");
      symndx_to_section[RELOC_SECTION_DATA] =
	bfd_get_section_by_name (input_bfd, ".data");
      symndx_to_section[RELOC_SECTION_SDATA] =
	bfd_get_section_by_name (input_bfd, ".sdata");
      symndx_to_section[RELOC_SECTION_SBSS] =
	bfd_get_section_by_name (input_bfd, ".sbss");
      symndx_to_section[RELOC_SECTION_BSS] =
	bfd_get_section_by_name (input_bfd, ".bss");
      symndx_to_section[RELOC_SECTION_INIT] =
	bfd_get_section_by_name (input_bfd, ".init");
      symndx_to_section[RELOC_SECTION_LIT8] =
	bfd_get_section_by_name (input_bfd, ".lit8");
      symndx_to_section[RELOC_SECTION_LIT4] =
	bfd_get_section_by_name (input_bfd, ".lit4");
      symndx_to_section[RELOC_SECTION_XDATA] = NULL;
      symndx_to_section[RELOC_SECTION_PDATA] = NULL;
      symndx_to_section[RELOC_SECTION_FINI] =
	bfd_get_section_by_name (input_bfd, ".fini");
      symndx_to_section[RELOC_SECTION_LITA] = NULL;
      symndx_to_section[RELOC_SECTION_ABS] = NULL;

      ecoff_data (input_bfd)->symndx_to_section = symndx_to_section;
    }

  sym_hashes = ecoff_data (input_bfd)->sym_hashes;

  gp = _bfd_get_gp_value (output_bfd);
  if (gp == 0)
    gp_undefined = TRUE;
  else
    gp_undefined = FALSE;

  got_lo = FALSE;

  ext_rel = (struct external_reloc *) external_relocs;
  ext_rel_end = ext_rel + input_section->reloc_count;
  for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++)
    {
      struct internal_reloc int_rel;
      bfd_boolean use_lo = FALSE;
      bfd_vma addend;
      reloc_howto_type *howto;
      struct ecoff_link_hash_entry *h = NULL;
      asection *s = NULL;
      bfd_vma relocation;
      bfd_reloc_status_type r;

      if (! got_lo)
	mips_ecoff_swap_reloc_in (input_bfd, (PTR) ext_rel, &int_rel);
      else
	{
	  int_rel = lo_int_rel;
	  got_lo = FALSE;
	}

      BFD_ASSERT (int_rel.r_type
		  < sizeof mips_howto_table / sizeof mips_howto_table[0]);

      /* The REFHI reloc requires special handling.  It must be followed
	 by a REFLO reloc, and the addend is formed from both relocs.  */
      if (int_rel.r_type == MIPS_R_REFHI)
	{
	  struct external_reloc *lo_ext_rel;

	  /* As a GNU extension, permit an arbitrary number of REFHI
             relocs before the REFLO reloc.  This permits gcc to emit
	     the HI and LO relocs itself.  */
	  for (lo_ext_rel = ext_rel + 1;
	       lo_ext_rel < ext_rel_end;
	       lo_ext_rel++)
	    {
	      mips_ecoff_swap_reloc_in (input_bfd, (PTR) lo_ext_rel,
					&lo_int_rel);
	      if (lo_int_rel.r_type != int_rel.r_type)
		break;
	    }

	  if (lo_ext_rel < ext_rel_end
	      && lo_int_rel.r_type == MIPS_R_REFLO
	      && int_rel.r_extern == lo_int_rel.r_extern
	      && int_rel.r_symndx == lo_int_rel.r_symndx)
	    {
	      use_lo = TRUE;
	      if (lo_ext_rel == ext_rel + 1)
		got_lo = TRUE;
	    }
	}

      howto = &mips_howto_table[int_rel.r_type];

      if (int_rel.r_extern)
	{
	  h = sym_hashes[int_rel.r_symndx];
	  /* If h is NULL, that means that there is a reloc against an
	     external symbol which we thought was just a debugging
	     symbol.  This should not happen.  */
	  if (h == (struct ecoff_link_hash_entry *) NULL)
	    abort ();
	}
      else
	{
	  if (int_rel.r_symndx < 0 || int_rel.r_symndx >= NUM_RELOC_SECTIONS)
	    s = NULL;
	  else
	    s = symndx_to_section[int_rel.r_symndx];

	  if (s == (asection *) NULL)
	    abort ();
	}

      /* The GPREL reloc uses an addend: the difference in the GP
	 values.  */
      if (int_rel.r_type != MIPS_R_GPREL
	  && int_rel.r_type != MIPS_R_LITERAL)
	addend = 0;
      else
	{
	  if (gp_undefined)
	    {
	      if (! ((*info->callbacks->reloc_dangerous)
		     (info, _("GP relative relocation used when GP not defined"),
		      input_bfd, input_section,
		      int_rel.r_vaddr - input_section->vma)))
		return FALSE;
	      /* Only give the error once per link.  */
	      gp = 4;
	      _bfd_set_gp_value (output_bfd, gp);
	      gp_undefined = FALSE;
	    }
	  if (! int_rel.r_extern)
	    {
	      /* This is a relocation against a section.  The current
		 addend in the instruction is the difference between
		 INPUT_SECTION->vma and the GP value of INPUT_BFD.  We
		 must change this to be the difference between the
		 final definition (which will end up in RELOCATION)
		 and the GP value of OUTPUT_BFD (which is in GP).  */
	      addend = ecoff_data (input_bfd)->gp - gp;
	    }
	  else if (! info->relocatable
		   || h->root.type == bfd_link_hash_defined
		   || h->root.type == bfd_link_hash_defweak)
	    {
	      /* This is a relocation against a defined symbol.  The
		 current addend in the instruction is simply the
		 desired offset into the symbol (normally zero).  We
		 are going to change this into a relocation against a
		 defined symbol, so we want the instruction to hold
		 the difference between the final definition of the
		 symbol (which will end up in RELOCATION) and the GP
		 value of OUTPUT_BFD (which is in GP).  */
	      addend = - gp;
	    }
	  else
	    {
	      /* This is a relocation against an undefined or common
		 symbol.  The current addend in the instruction is
		 simply the desired offset into the symbol (normally
		 zero).  We are generating relocatable output, and we
		 aren't going to define this symbol, so we just leave
		 the instruction alone.  */
	      addend = 0;
	    }
	}

      if (info->relocatable)
	{
	  /* We are generating relocatable output, and must convert
	     the existing reloc.  */
	  if (int_rel.r_extern)
	    {
	      if ((h->root.type == bfd_link_hash_defined
		   || h->root.type == bfd_link_hash_defweak)
		  && ! bfd_is_abs_section (h->root.u.def.section))
		{
		  const char *name;

		  /* This symbol is defined in the output.  Convert
		     the reloc from being against the symbol to being
		     against the section.  */

		  /* Clear the r_extern bit.  */
		  int_rel.r_extern = 0;

		  /* Compute a new r_symndx value.  */
		  s = h->root.u.def.section;
		  name = bfd_get_section_name (output_bfd,
					       s->output_section);

		  int_rel.r_symndx = -1;
		  switch (name[1])
		    {
		    case 'b':
		      if (strcmp (name, ".bss") == 0)
			int_rel.r_symndx = RELOC_SECTION_BSS;
		      break;
		    case 'd':
		      if (strcmp (name, ".data") == 0)
			int_rel.r_symndx = RELOC_SECTION_DATA;
		      break;
		    case 'f':
		      if (strcmp (name, ".fini") == 0)
			int_rel.r_symndx = RELOC_SECTION_FINI;
		      break;
		    case 'i':
		      if (strcmp (name, ".init") == 0)
			int_rel.r_symndx = RELOC_SECTION_INIT;
		      break;
		    case 'l':
		      if (strcmp (name, ".lit8") == 0)
			int_rel.r_symndx = RELOC_SECTION_LIT8;
		      else if (strcmp (name, ".lit4") == 0)
			int_rel.r_symndx = RELOC_SECTION_LIT4;
		      break;
		    case 'r':
		      if (strcmp (name, ".rdata") == 0)
			int_rel.r_symndx = RELOC_SECTION_RDATA;
		      break;
		    case 's':
		      if (strcmp (name, ".sdata") == 0)
			int_rel.r_symndx = RELOC_SECTION_SDATA;
		      else if (strcmp (name, ".sbss") == 0)
			int_rel.r_symndx = RELOC_SECTION_SBSS;
		      break;
		    case 't':
		      if (strcmp (name, ".text") == 0)
			int_rel.r_symndx = RELOC_SECTION_TEXT;
		      break;
		    }

		  if (int_rel.r_symndx == -1)
		    abort ();

		  /* Add the section VMA and the symbol value.  */
		  relocation = (h->root.u.def.value
				+ s->output_section->vma
				+ s->output_offset);

		  /* For a PC relative relocation, the object file
		     currently holds just the addend.  We must adjust
		     by the address to get the right value.  */
		  if (howto->pc_relative)
		    relocation -= int_rel.r_vaddr - input_section->vma;

		  h = NULL;
		}
	      else
		{
		  /* Change the symndx value to the right one for the
		     output BFD.  */
		  int_rel.r_symndx = h->indx;
		  if (int_rel.r_symndx == -1)
		    {
		      /* This symbol is not being written out.  */
		      if (! ((*info->callbacks->unattached_reloc)
			     (info, h->root.root.string, input_bfd,
			      input_section,
			      int_rel.r_vaddr - input_section->vma)))
			return FALSE;
		      int_rel.r_symndx = 0;
		    }
		  relocation = 0;
		}
	    }
	  else
	    {
	      /* This is a relocation against a section.  Adjust the
		 value by the amount the section moved.  */
	      relocation = (s->output_section->vma
			    + s->output_offset
			    - s->vma);
	    }

	  relocation += addend;
	  addend = 0;

	  /* Adjust a PC relative relocation by removing the reference
	     to the original address in the section and including the
	     reference to the new address.  */
	  if (howto->pc_relative)
	    relocation -= (input_section->output_section->vma
			   + input_section->output_offset
			   - input_section->vma);

	  /* Adjust the contents.  */
	  if (relocation == 0)
	    r = bfd_reloc_ok;
	  else
	    {
	      if (int_rel.r_type != MIPS_R_REFHI)
		r = _bfd_relocate_contents (howto, input_bfd, relocation,
					    (contents
					     + int_rel.r_vaddr
					     - input_section->vma));
	      else
		{
		  mips_relocate_hi (&int_rel,
				    use_lo ? &lo_int_rel : NULL,
				    input_bfd, input_section, contents,
				    relocation);
		  r = bfd_reloc_ok;
		}
	    }

	  /* Adjust the reloc address.  */
	  int_rel.r_vaddr += (input_section->output_section->vma
			      + input_section->output_offset
			      - input_section->vma);

	  /* Save the changed reloc information.  */
	  mips_ecoff_swap_reloc_out (input_bfd, &int_rel, (PTR) ext_rel);
	}
      else
	{
	  /* We are producing a final executable.  */
	  if (int_rel.r_extern)
	    {
	      /* This is a reloc against a symbol.  */
	      if (h->root.type == bfd_link_hash_defined
		  || h->root.type == bfd_link_hash_defweak)
		{
		  asection *hsec;

		  hsec = h->root.u.def.section;
		  relocation = (h->root.u.def.value
				+ hsec->output_section->vma
				+ hsec->output_offset);
		}
	      else
		{
		  if (! ((*info->callbacks->undefined_symbol)
			 (info, h->root.root.string, input_bfd,
			  input_section,
			  int_rel.r_vaddr - input_section->vma, TRUE)))
		    return FALSE;
		  relocation = 0;
		}
	    }
	  else
	    {
	      /* This is a reloc against a section.  */
	      relocation = (s->output_section->vma
			    + s->output_offset
			    - s->vma);

	      /* A PC relative reloc is already correct in the object
		 file.  Make it look like a pcrel_offset relocation by
		 adding in the start address.  */
	      if (howto->pc_relative)
		relocation += int_rel.r_vaddr;
	    }

	  if (int_rel.r_type != MIPS_R_REFHI)
	    r = _bfd_final_link_relocate (howto,
					  input_bfd,
					  input_section,
					  contents,
					  (int_rel.r_vaddr
					   - input_section->vma),
					  relocation,
					  addend);
	  else
	    {
	      mips_relocate_hi (&int_rel,
				use_lo ? &lo_int_rel : NULL,
				input_bfd, input_section, contents,
				relocation);
	      r = bfd_reloc_ok;
	    }
	}

      /* MIPS_R_JMPADDR requires peculiar overflow detection.  The
	 instruction provides a 28 bit address (the two lower bits are
	 implicit zeroes) which is combined with the upper four bits
	 of the instruction address.  */
      if (r == bfd_reloc_ok
	  && int_rel.r_type == MIPS_R_JMPADDR
	  && (((relocation
		+ addend
		+ (int_rel.r_extern ? 0 : s->vma))
	       & 0xf0000000)
	      != ((input_section->output_section->vma
		   + input_section->output_offset
		   + (int_rel.r_vaddr - input_section->vma))
		  & 0xf0000000)))
	r = bfd_reloc_overflow;

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

		if (int_rel.r_extern)
		  name = NULL;
		else
		  name = bfd_section_name (input_bfd, s);
		if (! ((*info->callbacks->reloc_overflow)
		       (info, (h ? &h->root : NULL), name, howto->name,
			(bfd_vma) 0, input_bfd, input_section,
			int_rel.r_vaddr - input_section->vma)))
		  return FALSE;
	      }
	      break;
	    }
	}
    }

  return TRUE;
}

/* This is the ECOFF backend structure.  The backend field of the
   target vector points to this.  */

static const struct ecoff_backend_data mips_ecoff_backend_data =
{
  /* COFF backend structure.  */
  {
    (void (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR))) bfd_void, /* aux_in */
    (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_in */
    (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_in */
    (unsigned (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR)))bfd_void,/*aux_out*/
    (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_out */
    (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_out */
    (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* reloc_out */
    mips_ecoff_swap_filehdr_out, mips_ecoff_swap_aouthdr_out,
    mips_ecoff_swap_scnhdr_out,
    FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, 0, FILNMLEN, TRUE, FALSE, 4, FALSE, 2,
    mips_ecoff_swap_filehdr_in, mips_ecoff_swap_aouthdr_in,
    mips_ecoff_swap_scnhdr_in, NULL,
    mips_ecoff_bad_format_hook, _bfd_ecoff_set_arch_mach_hook,
    _bfd_ecoff_mkobject_hook, _bfd_ecoff_styp_to_sec_flags,
    _bfd_ecoff_set_alignment_hook, _bfd_ecoff_slurp_symbol_table,
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    NULL, NULL
  },
  /* Supported architecture.  */
  bfd_arch_mips,
  /* Initial portion of armap string.  */
  "__________",
  /* The page boundary used to align sections in a demand-paged
     executable file.  E.g., 0x1000.  */
  0x1000,
  /* TRUE if the .rdata section is part of the text segment, as on the
     Alpha.  FALSE if .rdata is part of the data segment, as on the
     MIPS.  */
  FALSE,
  /* Bitsize of constructor entries.  */
  32,
  /* Reloc to use for constructor entries.  */
  &mips_howto_table[MIPS_R_REFWORD],
  {
    /* Symbol table magic number.  */
    magicSym,
    /* Alignment of debugging information.  E.g., 4.  */
    4,
    /* Sizes of external symbolic information.  */
    sizeof (struct hdr_ext),
    sizeof (struct dnr_ext),
    sizeof (struct pdr_ext),
    sizeof (struct sym_ext),
    sizeof (struct opt_ext),
    sizeof (struct fdr_ext),
    sizeof (struct rfd_ext),
    sizeof (struct ext_ext),
    /* Functions to swap in external symbolic data.  */
    ecoff_swap_hdr_in,
    ecoff_swap_dnr_in,
    ecoff_swap_pdr_in,
    ecoff_swap_sym_in,
    ecoff_swap_opt_in,
    ecoff_swap_fdr_in,
    ecoff_swap_rfd_in,
    ecoff_swap_ext_in,
    _bfd_ecoff_swap_tir_in,
    _bfd_ecoff_swap_rndx_in,
    /* Functions to swap out external symbolic data.  */
    ecoff_swap_hdr_out,
    ecoff_swap_dnr_out,
    ecoff_swap_pdr_out,
    ecoff_swap_sym_out,
    ecoff_swap_opt_out,
    ecoff_swap_fdr_out,
    ecoff_swap_rfd_out,
    ecoff_swap_ext_out,
    _bfd_ecoff_swap_tir_out,
    _bfd_ecoff_swap_rndx_out,
    /* Function to read in symbolic data.  */
    _bfd_ecoff_slurp_symbolic_info
  },
  /* External reloc size.  */
  RELSZ,
  /* Reloc swapping functions.  */
  mips_ecoff_swap_reloc_in,
  mips_ecoff_swap_reloc_out,
  /* Backend reloc tweaking.  */
  mips_adjust_reloc_in,
  mips_adjust_reloc_out,
  /* Relocate section contents while linking.  */
  mips_relocate_section,
  /* Do final adjustments to filehdr and aouthdr.  */
  NULL,
  /* Read an element from an archive at a given file position.  */
  _bfd_get_elt_at_filepos
};

/* Looking up a reloc type is MIPS specific.  */
#define _bfd_ecoff_bfd_reloc_type_lookup mips_bfd_reloc_type_lookup

/* Getting relocated section contents is generic.  */
#define _bfd_ecoff_bfd_get_relocated_section_contents \
  bfd_generic_get_relocated_section_contents

/* Handling file windows is generic.  */
#define _bfd_ecoff_get_section_contents_in_window \
  _bfd_generic_get_section_contents_in_window

/* Relaxing sections is MIPS specific.  */
#define _bfd_ecoff_bfd_relax_section bfd_generic_relax_section

/* GC of sections is not done.  */
#define _bfd_ecoff_bfd_gc_sections bfd_generic_gc_sections

/* Merging of sections is not done.  */
#define _bfd_ecoff_bfd_merge_sections bfd_generic_merge_sections

#define _bfd_ecoff_bfd_is_group_section bfd_generic_is_group_section
#define _bfd_ecoff_bfd_discard_group bfd_generic_discard_group
#define _bfd_ecoff_section_already_linked \
  _bfd_generic_section_already_linked

extern const bfd_target ecoff_big_vec;

const bfd_target ecoff_little_vec =
{
  "ecoff-littlemips",		/* name */
  bfd_target_ecoff_flavour,
  BFD_ENDIAN_LITTLE,		/* data byte order is little */
  BFD_ENDIAN_LITTLE,		/* header byte order is little */

  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
  0,				/* leading underscore */
  ' ',				/* ar_pad_char */
  15,				/* ar_max_namelen */
  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */

  {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
     _bfd_ecoff_archive_p, _bfd_dummy_target},
  {bfd_false, _bfd_ecoff_mkobject,  /* bfd_set_format */
     _bfd_generic_mkarchive, bfd_false},
  {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */
     _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (_bfd_ecoff),
     BFD_JUMP_TABLE_COPY (_bfd_ecoff),
     BFD_JUMP_TABLE_CORE (_bfd_nocore),
     BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff),
     BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff),
     BFD_JUMP_TABLE_RELOCS (_bfd_ecoff),
     BFD_JUMP_TABLE_WRITE (_bfd_ecoff),
     BFD_JUMP_TABLE_LINK (_bfd_ecoff),
     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  & ecoff_big_vec,

  (PTR) &mips_ecoff_backend_data
};

const bfd_target ecoff_big_vec =
{
  "ecoff-bigmips",		/* name */
  bfd_target_ecoff_flavour,
  BFD_ENDIAN_BIG,		/* data byte order is big */
  BFD_ENDIAN_BIG,		/* header byte order is big */

  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
  0,				/* leading underscore */
  ' ',				/* ar_pad_char */
  15,				/* ar_max_namelen */
  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
     bfd_getb16, bfd_getb_signed_16, bfd_putb16,
  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
     bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
    _bfd_ecoff_archive_p, _bfd_dummy_target},
 {bfd_false, _bfd_ecoff_mkobject, /* bfd_set_format */
    _bfd_generic_mkarchive, bfd_false},
 {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */
    _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (_bfd_ecoff),
     BFD_JUMP_TABLE_COPY (_bfd_ecoff),
     BFD_JUMP_TABLE_CORE (_bfd_nocore),
     BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff),
     BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff),
     BFD_JUMP_TABLE_RELOCS (_bfd_ecoff),
     BFD_JUMP_TABLE_WRITE (_bfd_ecoff),
     BFD_JUMP_TABLE_LINK (_bfd_ecoff),
     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  & ecoff_little_vec,

  (PTR) &mips_ecoff_backend_data
};

const bfd_target ecoff_biglittle_vec =
{
  "ecoff-biglittlemips",		/* name */
  bfd_target_ecoff_flavour,
  BFD_ENDIAN_LITTLE,		/* data byte order is little */
  BFD_ENDIAN_BIG,		/* header byte order is big */

  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
  0,				/* leading underscore */
  ' ',				/* ar_pad_char */
  15,				/* ar_max_namelen */
  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */

  {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
     _bfd_ecoff_archive_p, _bfd_dummy_target},
  {bfd_false, _bfd_ecoff_mkobject,  /* bfd_set_format */
     _bfd_generic_mkarchive, bfd_false},
  {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */
     _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (_bfd_ecoff),
     BFD_JUMP_TABLE_COPY (_bfd_ecoff),
     BFD_JUMP_TABLE_CORE (_bfd_nocore),
     BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff),
     BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff),
     BFD_JUMP_TABLE_RELOCS (_bfd_ecoff),
     BFD_JUMP_TABLE_WRITE (_bfd_ecoff),
     BFD_JUMP_TABLE_LINK (_bfd_ecoff),
     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  (PTR) &mips_ecoff_backend_data
};