aboutsummaryrefslogtreecommitdiff
blob: 5ca57e5976bef469f8d16119344d397326d1f318 (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
/* tc-rl78.c -- Assembler for the Renesas RL78
   Copyright (C) 2011-2017 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GAS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#include "as.h"
#include "struc-symbol.h"
#include "safe-ctype.h"
#include "dwarf2dbg.h"
#include "elf/common.h"
#include "elf/rl78.h"
#include "rl78-defs.h"
#include "filenames.h"
#include "listing.h"
#include "sb.h"
#include "macro.h"

const char comment_chars[]        = ";";
/* Note that input_file.c hand checks for '#' at the beginning of the
   first line of the input file.  This is because the compiler outputs
   #NO_APP at the beginning of its output.  */
const char line_comment_chars[]   = "#";
/* Use something that isn't going to be needed by any expressions or
   other syntax.  */
const char line_separator_chars[] = "@";

const char EXP_CHARS[]            = "eE";
const char FLT_CHARS[]            = "dD";

/* ELF flags to set in the output file header.  */
static int elf_flags = 0;

/*------------------------------------------------------------------*/

char * rl78_lex_start;
char * rl78_lex_end;

typedef struct rl78_bytesT
{
  char prefix[1];
  int n_prefix;
  char base[4];
  int n_base;
  char ops[8];
  int n_ops;
  struct
  {
    expressionS  exp;
    char         offset;
    char         nbits;
    char         type; /* RL78REL_*.  */
    int          reloc;
    fixS *       fixP;
  } fixups[2];
  int n_fixups;
  struct
  {
    char type;
    char field_pos;
    char val_ofs;
  } relax[2];
  int n_relax;
  int link_relax;
  fixS *link_relax_fixP;
  char times_grown;
  char times_shrank;
} rl78_bytesT;

static rl78_bytesT rl78_bytes;

void
rl78_relax (int type, int pos)
{
  rl78_bytes.relax[rl78_bytes.n_relax].type = type;
  rl78_bytes.relax[rl78_bytes.n_relax].field_pos = pos;
  rl78_bytes.relax[rl78_bytes.n_relax].val_ofs = rl78_bytes.n_base + rl78_bytes.n_ops;
  rl78_bytes.n_relax ++;
}

void
rl78_linkrelax_addr16 (void)
{
  rl78_bytes.link_relax |= RL78_RELAXA_ADDR16;
}

void
rl78_linkrelax_branch (void)
{
  rl78_relax (RL78_RELAX_BRANCH, 0);
  rl78_bytes.link_relax |= RL78_RELAXA_BRA;
}

static void
rl78_fixup (expressionS exp, int offsetbits, int nbits, int type)
{
  rl78_bytes.fixups[rl78_bytes.n_fixups].exp = exp;
  rl78_bytes.fixups[rl78_bytes.n_fixups].offset = offsetbits;
  rl78_bytes.fixups[rl78_bytes.n_fixups].nbits = nbits;
  rl78_bytes.fixups[rl78_bytes.n_fixups].type = type;
  rl78_bytes.fixups[rl78_bytes.n_fixups].reloc = exp.X_md;
  rl78_bytes.n_fixups ++;
}

#define rl78_field_fixup(exp, offset, nbits, type)	\
  rl78_fixup (exp, offset + 8 * rl78_bytes.n_prefix), nbits, type)

#define rl78_op_fixup(exp, offset, nbits, type)		\
  rl78_fixup (exp, offset + 8 * (rl78_bytes.n_prefix + rl78_bytes.n_base), nbits, type)

void
rl78_prefix (int p)
{
  rl78_bytes.prefix[0] = p;
  rl78_bytes.n_prefix = 1;
}

int
rl78_has_prefix (void)
{
  return rl78_bytes.n_prefix;
}

void
rl78_base1 (int b1)
{
  rl78_bytes.base[0] = b1;
  rl78_bytes.n_base = 1;
}

void
rl78_base2 (int b1, int b2)
{
  rl78_bytes.base[0] = b1;
  rl78_bytes.base[1] = b2;
  rl78_bytes.n_base = 2;
}

void
rl78_base3 (int b1, int b2, int b3)
{
  rl78_bytes.base[0] = b1;
  rl78_bytes.base[1] = b2;
  rl78_bytes.base[2] = b3;
  rl78_bytes.n_base = 3;
}

void
rl78_base4 (int b1, int b2, int b3, int b4)
{
  rl78_bytes.base[0] = b1;
  rl78_bytes.base[1] = b2;
  rl78_bytes.base[2] = b3;
  rl78_bytes.base[3] = b4;
  rl78_bytes.n_base = 4;
}

#define F_PRECISION 2

void
rl78_op (expressionS exp, int nbytes, int type)
{
  int v = 0;

  if ((exp.X_op == O_constant || exp.X_op == O_big)
      && type != RL78REL_PCREL)
    {
      if (exp.X_op == O_big && exp.X_add_number <= 0)
	{
	  LITTLENUM_TYPE w[2];
	  char * ip = rl78_bytes.ops + rl78_bytes.n_ops;

	  gen_to_words (w, F_PRECISION, 8);
	  ip[3] = w[0] >> 8;
	  ip[2] = w[0];
	  ip[1] = w[1] >> 8;
	  ip[0] = w[1];
	  rl78_bytes.n_ops += 4;
	}
      else
	{
	  v = exp.X_add_number;
	  while (nbytes)
	    {
	      rl78_bytes.ops[rl78_bytes.n_ops++] =v & 0xff;
	      v >>= 8;
	      nbytes --;
	    }
	}
    }
  else
    {
      if (nbytes > 2
	  && exp.X_md == BFD_RELOC_RL78_CODE)
	exp.X_md = 0;

      if (nbytes == 1
	  && (exp.X_md == BFD_RELOC_RL78_LO16
	      || exp.X_md == BFD_RELOC_RL78_HI16))
	as_bad (_("16-bit relocation used in 8-bit operand"));

      if (nbytes == 2
	  && exp.X_md == BFD_RELOC_RL78_HI8)
	as_bad (_("8-bit relocation used in 16-bit operand"));

      rl78_op_fixup (exp, rl78_bytes.n_ops * 8, nbytes * 8, type);
      memset (rl78_bytes.ops + rl78_bytes.n_ops, 0, nbytes);
      rl78_bytes.n_ops += nbytes;
    }
}

/* This gets complicated when the field spans bytes, because fields
   are numbered from the MSB of the first byte as zero, and bits are
   stored LSB towards the LSB of the byte.  Thus, a simple four-bit
   insertion of 12 at position 4 of 0x00 yields: 0x0b.  A three-bit
   insertion of b'MXL at position 7 is like this:

     - - - -  - - - -   - - - -  - - - -
                    M   X L               */

void
rl78_field (int val, int pos, int sz)
{
  int valm;
  int bytep, bitp;

  if (sz > 0)
    {
      if (val < 0 || val >= (1 << sz))
	as_bad (_("Value %d doesn't fit in unsigned %d-bit field"), val, sz);
    }
  else
    {
      sz = - sz;
      if (val < -(1 << (sz - 1)) || val >= (1 << (sz - 1)))
	as_bad (_("Value %d doesn't fit in signed %d-bit field"), val, sz);
    }

  /* This code points at 'M' in the above example.  */
  bytep = pos / 8;
  bitp = pos % 8;

  while (bitp + sz > 8)
    {
      int ssz = 8 - bitp;
      int svalm;

      svalm = val >> (sz - ssz);
      svalm = svalm & ((1 << ssz) - 1);
      svalm = svalm << (8 - bitp - ssz);
      gas_assert (bytep < rl78_bytes.n_base);
      rl78_bytes.base[bytep] |= svalm;

      bitp = 0;
      sz -= ssz;
      bytep ++;
    }
  valm = val & ((1 << sz) - 1);
  valm = valm << (8 - bitp - sz);
  gas_assert (bytep < rl78_bytes.n_base);
  rl78_bytes.base[bytep] |= valm;
}

/*------------------------------------------------------------------*/

enum options
{
  OPTION_RELAX = OPTION_MD_BASE,
  OPTION_NORELAX,
  OPTION_G10,
  OPTION_G13,
  OPTION_G14,
  OPTION_32BIT_DOUBLES,
  OPTION_64BIT_DOUBLES,
};

#define RL78_SHORTOPTS ""
const char * md_shortopts = RL78_SHORTOPTS;

/* Assembler options.  */
struct option md_longopts[] =
{
  {"relax", no_argument, NULL, OPTION_RELAX},
  {"norelax", no_argument, NULL, OPTION_NORELAX},
  {"mg10", no_argument, NULL, OPTION_G10},
  {"mg13", no_argument, NULL, OPTION_G13},
  {"mg14", no_argument, NULL, OPTION_G14},
  {"mrl78", no_argument, NULL, OPTION_G14},
  {"m32bit-doubles", no_argument, NULL, OPTION_32BIT_DOUBLES},
  {"m64bit-doubles", no_argument, NULL, OPTION_64BIT_DOUBLES},
  {NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);

int
md_parse_option (int c, const char * arg ATTRIBUTE_UNUSED)
{
  switch (c)
    {
    case OPTION_RELAX:
      linkrelax = 1;
      return 1;
    case OPTION_NORELAX:
      linkrelax = 0;
      return 1;

    case OPTION_G10:
      elf_flags &= ~ E_FLAG_RL78_CPU_MASK;
      elf_flags |= E_FLAG_RL78_G10;
      return 1;

    case OPTION_G13:
      elf_flags &= ~ E_FLAG_RL78_CPU_MASK;
      elf_flags |= E_FLAG_RL78_G13;
      return 1;

    case OPTION_G14:
      elf_flags &= ~ E_FLAG_RL78_CPU_MASK;
      elf_flags |= E_FLAG_RL78_G14;
      return 1;

    case OPTION_32BIT_DOUBLES:
      elf_flags &= ~ E_FLAG_RL78_64BIT_DOUBLES;
      return 1;

    case OPTION_64BIT_DOUBLES:
      elf_flags |= E_FLAG_RL78_64BIT_DOUBLES;
      return 1;
    }
  return 0;
}

int
rl78_isa_g10 (void)
{
  return (elf_flags & E_FLAG_RL78_CPU_MASK) == E_FLAG_RL78_G10;
}

int
rl78_isa_g13 (void)
{
  return (elf_flags & E_FLAG_RL78_CPU_MASK) == E_FLAG_RL78_G13;
}

int
rl78_isa_g14 (void)
{
  return (elf_flags & E_FLAG_RL78_CPU_MASK) == E_FLAG_RL78_G14;
}

void
md_show_usage (FILE * stream)
{
  fprintf (stream, _(" RL78 specific command line options:\n"));
  fprintf (stream, _("  --mrelax          Enable link time relaxation\n"));
  fprintf (stream, _("  --mg10            Enable support for G10 variant\n"));
  fprintf (stream, _("  --mg13            Selects the G13 core.\n"));
  fprintf (stream, _("  --mg14            Selects the G14 core [default]\n"));
  fprintf (stream, _("  --mrl78           Alias for --mg14\n"));
  fprintf (stream, _("  --m32bit-doubles  [default]\n"));
  fprintf (stream, _("  --m64bit-doubles  Source code uses 64-bit doubles\n"));
}

static void
s_bss (int ignore ATTRIBUTE_UNUSED)
{
  int temp;

  temp = get_absolute_expression ();
  subseg_set (bss_section, (subsegT) temp);
  demand_empty_rest_of_line ();
}

static void
rl78_float_cons (int ignore ATTRIBUTE_UNUSED)
{
  if (elf_flags & E_FLAG_RL78_64BIT_DOUBLES)
    return float_cons ('d');
  return float_cons ('f');
}

/* The target specific pseudo-ops which we support.  */
const pseudo_typeS md_pseudo_table[] =
{
  /* Our "standard" pseudos.  */
  { "double", rl78_float_cons,	'd' },
  { "bss",    s_bss, 		0 },
  { "3byte",  cons,		3 },
  { "int",    cons,		4 },
  { "word",   cons,		4 },

  /* End of list marker.  */
  { NULL, 	NULL, 		0 }
};

static symbolS * rl78_abs_sym = NULL;

void
md_begin (void)
{
  rl78_abs_sym = symbol_make ("__rl78_abs__");
}

void
rl78_md_end (void)
{
}

/* Set the ELF specific flags.  */
void
rl78_elf_final_processing (void)
{
  elf_elfheader (stdoutput)->e_flags |= elf_flags;
}

/* Write a value out to the object file, using the appropriate endianness.  */
void
md_number_to_chars (char * buf, valueT val, int n)
{
  number_to_chars_littleendian (buf, val, n);
}

static void
require_end_of_expr (const char *fname)
{
  while (* input_line_pointer == ' '
	 || * input_line_pointer == '\t')
    input_line_pointer ++;

  if (! * input_line_pointer
      || strchr ("\n\r,", * input_line_pointer)
      || strchr (comment_chars, * input_line_pointer)
      || strchr (line_comment_chars, * input_line_pointer)
      || strchr (line_separator_chars, * input_line_pointer))
    return;

  as_bad (_("%%%s() must be outermost term in expression"), fname);
}

static struct
{
  const char * fname;
  int    reloc;
}
reloc_functions[] =
{
  { "code", BFD_RELOC_RL78_CODE },
  { "lo16", BFD_RELOC_RL78_LO16 },
  { "hi16", BFD_RELOC_RL78_HI16 },
  { "hi8",  BFD_RELOC_RL78_HI8 },
  { 0, 0 }
};

void
md_operand (expressionS * exp ATTRIBUTE_UNUSED)
{
  int reloc = 0;
  int i;

  for (i = 0; reloc_functions[i].fname; i++)
    {
      int flen = strlen (reloc_functions[i].fname);

      if (input_line_pointer[0] == '%'
	  && strncasecmp (input_line_pointer + 1, reloc_functions[i].fname, flen) == 0
	  && input_line_pointer[flen + 1] == '(')
	{
	  reloc = reloc_functions[i].reloc;
	  input_line_pointer += flen + 2;
	  break;
	}
    }
  if (reloc == 0)
    return;

  expression (exp);
  if (* input_line_pointer == ')')
    input_line_pointer ++;

  exp->X_md = reloc;

  require_end_of_expr (reloc_functions[i].fname);
}

void
rl78_frag_init (fragS * fragP)
{
  if (rl78_bytes.n_relax || rl78_bytes.link_relax)
    {
      fragP->tc_frag_data = XNEW (rl78_bytesT);
      memcpy (fragP->tc_frag_data, & rl78_bytes, sizeof (rl78_bytesT));
    }
  else
    fragP->tc_frag_data = 0;
}

/* When relaxing, we need to output a reloc for any .align directive
   so that we can retain this alignment as we adjust opcode sizes.  */
void
rl78_handle_align (fragS * frag)
{
  if (linkrelax
      && (frag->fr_type == rs_align
	  || frag->fr_type == rs_align_code)
      && frag->fr_address + frag->fr_fix > 0
      && frag->fr_offset > 0
      && now_seg != bss_section)
    {
      fix_new (frag, frag->fr_fix, 0,
	       &abs_symbol, RL78_RELAXA_ALIGN + frag->fr_offset,
	       0, BFD_RELOC_RL78_RELAX);
      /* For the purposes of relaxation, this relocation is attached
	 to the byte *after* the alignment - i.e. the byte that must
	 remain aligned.  */
      fix_new (frag->fr_next, 0, 0,
	       &abs_symbol, RL78_RELAXA_ELIGN + frag->fr_offset,
	       0, BFD_RELOC_RL78_RELAX);
    }
}

const char *
md_atof (int type, char * litP, int * sizeP)
{
  return ieee_md_atof (type, litP, sizeP, target_big_endian);
}

symbolS *
md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
{
  return NULL;
}

#define APPEND(B, N_B)				       \
  if (rl78_bytes.N_B)				       \
    {						       \
      memcpy (bytes + idx, rl78_bytes.B, rl78_bytes.N_B);  \
      idx += rl78_bytes.N_B;			       \
    }


void
md_assemble (char * str)
{
  char * bytes;
  fragS * frag_then = frag_now;
  int idx = 0;
  int i;
  int rel;
  expressionS  *exp;

  /*printf("\033[32mASM: %s\033[0m\n", str);*/

  dwarf2_emit_insn (0);

  memset (& rl78_bytes, 0, sizeof (rl78_bytes));

  rl78_lex_init (str, str + strlen (str));

  rl78_parse ();

  /* This simplifies the relaxation code.  */
  if (rl78_bytes.n_relax || rl78_bytes.link_relax)
    {
      int olen = rl78_bytes.n_prefix + rl78_bytes.n_base + rl78_bytes.n_ops;
      /* We do it this way because we want the frag to have the
	 rl78_bytes in it, which we initialize above.  The extra bytes
	 are for relaxing.  */
      bytes = frag_more (olen + 3);
      frag_then = frag_now;
      frag_variant (rs_machine_dependent,
		    olen /* max_chars */,
		    0 /* var */,
		    olen /* subtype */,
		    0 /* symbol */,
		    0 /* offset */,
		    0 /* opcode */);
      frag_then->fr_opcode = bytes;
      frag_then->fr_fix = olen + (bytes - frag_then->fr_literal);
      frag_then->fr_subtype = olen;
      frag_then->fr_var = 0;
    }
  else
    {
      bytes = frag_more (rl78_bytes.n_prefix + rl78_bytes.n_base + rl78_bytes.n_ops);
      frag_then = frag_now;
    }

  APPEND (prefix, n_prefix);
  APPEND (base, n_base);
  APPEND (ops, n_ops);

  if (rl78_bytes.link_relax)
    {
      fixS * f;

      f = fix_new (frag_then,
		   (char *) bytes - frag_then->fr_literal,
		   0,
		   abs_section_sym,
		   rl78_bytes.link_relax | rl78_bytes.n_fixups,
		   0,
		   BFD_RELOC_RL78_RELAX);
      frag_then->tc_frag_data->link_relax_fixP = f;
    }

  for (i = 0; i < rl78_bytes.n_fixups; i ++)
    {
      /* index: [nbytes][type] */
      static int reloc_map[5][4] =
	{
	  { 0,            0 },
	  { BFD_RELOC_8,  BFD_RELOC_8_PCREL },
	  { BFD_RELOC_16, BFD_RELOC_16_PCREL },
	  { BFD_RELOC_24, BFD_RELOC_24_PCREL },
	  { BFD_RELOC_32, BFD_RELOC_32_PCREL },
	};
      fixS * f;

      idx = rl78_bytes.fixups[i].offset / 8;
      rel = reloc_map [rl78_bytes.fixups[i].nbits / 8][(int) rl78_bytes.fixups[i].type];

      if (rl78_bytes.fixups[i].reloc)
	rel = rl78_bytes.fixups[i].reloc;

      if (frag_then->tc_frag_data)
	exp = & frag_then->tc_frag_data->fixups[i].exp;
      else
	exp = & rl78_bytes.fixups[i].exp;

      f = fix_new_exp (frag_then,
		       (char *) bytes + idx - frag_then->fr_literal,
		       rl78_bytes.fixups[i].nbits / 8,
		       exp,
		       rl78_bytes.fixups[i].type == RL78REL_PCREL ? 1 : 0,
		       rel);
      if (frag_then->tc_frag_data)
	frag_then->tc_frag_data->fixups[i].fixP = f;
    }
}

void
rl78_cons_fix_new (fragS *	frag,
		 int		where,
		 int		size,
		 expressionS *  exp)
{
  bfd_reloc_code_real_type type;
  fixS *fixP;

  switch (size)
    {
    case 1:
      type = BFD_RELOC_8;
      break;
    case 2:
      type = BFD_RELOC_16;
      break;
    case 3:
      type = BFD_RELOC_24;
      break;
    case 4:
      type = BFD_RELOC_32;
      break;
    default:
      as_bad (_("unsupported constant size %d\n"), size);
      return;
    }

  switch (exp->X_md)
    {
    case BFD_RELOC_RL78_CODE:
      if (size == 2)
	type = exp->X_md;
      break;
    case BFD_RELOC_RL78_LO16:
    case BFD_RELOC_RL78_HI16:
      if (size != 2)
	{
	  /* Fixups to assembler generated expressions do not use %hi or %lo.  */
	  if (frag->fr_file)
	    as_bad (_("%%hi16/%%lo16 only applies to .short or .hword"));
	}
      else
	type = exp->X_md;
      break;
    case BFD_RELOC_RL78_HI8:
      if (size != 1)
	{
	  /* Fixups to assembler generated expressions do not use %hi or %lo.  */
	  if (frag->fr_file)
	    as_bad (_("%%hi8 only applies to .byte"));
	}
      else
	type = exp->X_md;
      break;
    default:
      break;
    }

  if (exp->X_op == O_subtract && exp->X_op_symbol)
    {
      if (size != 4 && size != 2 && size != 1)
	as_bad (_("difference of two symbols only supported with .long, .short, or .byte"));
      else
	type = BFD_RELOC_RL78_DIFF;
    }

  fixP = fix_new_exp (frag, where, (int) size, exp, 0, type);
  switch (exp->X_md)
    {
      /* These are intended to have values larger than the container,
	 since the backend puts only the portion we need in it.
	 However, we don't have a backend-specific reloc for them as
	 they're handled with complex relocations.  */
    case BFD_RELOC_RL78_LO16:
    case BFD_RELOC_RL78_HI16:
    case BFD_RELOC_RL78_HI8:
      fixP->fx_no_overflow = 1;
      break;
    default:
      break;
    }
}


/*----------------------------------------------------------------------*/
/* To recap: we estimate everything based on md_estimate_size, then
   adjust based on rl78_relax_frag.  When it all settles, we call
   md_convert frag to update the bytes.  The relaxation types and
   relocations are in fragP->tc_frag_data, which is a copy of that
   rl78_bytes.

   Our scheme is as follows: fr_fix has the size of the smallest
   opcode (like BRA.S).  We store the number of total bytes we need in
   fr_subtype.  When we're done relaxing, we use fr_subtype and the
   existing opcode bytes to figure out what actual opcode we need to
   put in there.  If the fixup isn't resolvable now, we use the
   maximal size.  */

#define TRACE_RELAX 0
#define tprintf if (TRACE_RELAX) printf


typedef enum
{
  OT_other,
  OT_bt,
  OT_bt_sfr,
  OT_bt_es,
  OT_bc,
  OT_bh,
  OT_sk,
  OT_call,
  OT_br,
} op_type_T;

/* We're looking for these types of relaxations:

   BT		00110001 sbit0cc1 addr----	(cc is 10 (BF) or 01 (BT))
   B~T		00110001 sbit0cc1 00000011 11101110 pcrel16- -------- (BR $!pcrel20)

   BT sfr	00110001 sbit0cc0 sfr----- addr----
   BT ES:	00010001 00101110 sbit0cc1 addr----

   BC		110111cc addr----
   B~C		110111cc 00000011 11101110 pcrel16- -------- (BR $!pcrel20)

   BH		01100001 110c0011 00000011 11101110 pcrel16- -------- (BR $!pcrel20)
   B~H		01100001 110c0011 00000011 11101110 pcrel16- -------- (BR $!pcrel20)
*/

/* Given the opcode bytes at OP, figure out which opcode it is and
   return the type of opcode.  We use this to re-encode the opcode as
   a different size later.  */

static op_type_T
rl78_opcode_type (char * ops)
{
  unsigned char *op = (unsigned char *)ops;

  if (op[0] == 0x31
      && ((op[1] & 0x0f) == 0x05
	  || (op[1] & 0x0f) == 0x03))
    return OT_bt;

  if (op[0] == 0x31
      && ((op[1] & 0x0f) == 0x04
	  || (op[1] & 0x0f) == 0x02))
    return OT_bt_sfr;

  if (op[0] == 0x11
      && op[1] == 0x31
      && ((op[2] & 0x0f) == 0x05
	  || (op[2] & 0x0f) == 0x03))
    return OT_bt_es;

  if ((op[0] & 0xfc) == 0xdc)
    return OT_bc;

  if (op[0] == 0x61
      && (op[1] & 0xef) == 0xc3)
    return OT_bh;

  if (op[0] == 0x61
      && (op[1] & 0xcf) == 0xc8)
    return OT_sk;

  if (op[0] == 0x61
      && (op[1] & 0xef) == 0xe3)
    return OT_sk;

  if (op[0] == 0xfc)
    return OT_call;

  if ((op[0] & 0xec) == 0xec)
    return OT_br;

  return OT_other;
}

/* Returns zero if *addrP has the target address.  Else returns nonzero
   if we cannot compute the target address yet.  */

static int
rl78_frag_fix_value (fragS *    fragP,
		     segT       segment,
		     int        which,
		     addressT * addrP,
		     int        need_diff,
		     addressT * sym_addr)
{
  addressT addr = 0;
  rl78_bytesT * b = fragP->tc_frag_data;
  expressionS * exp = & b->fixups[which].exp;

  if (need_diff && exp->X_op != O_subtract)
    return 1;

  if (exp->X_add_symbol)
    {
      if (S_FORCE_RELOC (exp->X_add_symbol, 1))
	return 1;
      if (S_GET_SEGMENT (exp->X_add_symbol) != segment)
	return 1;
      addr += S_GET_VALUE (exp->X_add_symbol);
    }

  if (exp->X_op_symbol)
    {
      if (exp->X_op != O_subtract)
	return 1;
      if (S_FORCE_RELOC (exp->X_op_symbol, 1))
	return 1;
      if (S_GET_SEGMENT (exp->X_op_symbol) != segment)
	return 1;
      addr -= S_GET_VALUE (exp->X_op_symbol);
    }
  if (sym_addr)
    * sym_addr = addr;
  addr += exp->X_add_number;
  * addrP = addr;
  return 0;
}

/* Estimate how big the opcode is after this relax pass.  The return
   value is the difference between fr_fix and the actual size.  We
   compute the total size in rl78_relax_frag and store it in fr_subtype,
   so we only need to subtract fx_fix and return it.  */

int
md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED)
{
  int opfixsize;
  int delta;

  /* This is the size of the opcode that's accounted for in fr_fix.  */
  opfixsize = fragP->fr_fix - (fragP->fr_opcode - fragP->fr_literal);
  /* This is the size of the opcode that isn't.  */
  delta = (fragP->fr_subtype - opfixsize);

  tprintf (" -> opfixsize %d delta %d\n", opfixsize, delta);
  return delta;
}

/* Given the new addresses for this relax pass, figure out how big
   each opcode must be.  We store the total number of bytes needed in
   fr_subtype.  The return value is the difference between the size
   after the last pass and the size after this pass, so we use the old
   fr_subtype to calculate the difference.  */

int
rl78_relax_frag (segT segment ATTRIBUTE_UNUSED, fragS * fragP, long stretch)
{
  addressT addr0, sym_addr;
  addressT mypc;
  int disp;
  int oldsize = fragP->fr_subtype;
  int newsize = oldsize;
  op_type_T optype;
  int ri;

  mypc = fragP->fr_address + (fragP->fr_opcode - fragP->fr_literal);

  /* If we ever get more than one reloc per opcode, this is the one
     we're relaxing.  */
  ri = 0;

  optype = rl78_opcode_type (fragP->fr_opcode);
  /* Try to get the target address.  */
  if (rl78_frag_fix_value (fragP, segment, ri, & addr0,
			   fragP->tc_frag_data->relax[ri].type != RL78_RELAX_BRANCH,
			   & sym_addr))
    {
      /* If we don't expect the linker to do relaxing, don't emit
	 expanded opcodes that only the linker will relax.  */
      if (!linkrelax)
	return newsize - oldsize;

      /* If we don't, we must use the maximum size for the linker.  */
      switch (fragP->tc_frag_data->relax[ri].type)
	{
	case RL78_RELAX_BRANCH:
	  switch (optype)
	    {
	    case OT_bt:
	      newsize = 6;
	      break;
	    case OT_bt_sfr:
	    case OT_bt_es:
	      newsize = 7;
	      break;
	    case OT_bc:
	      newsize = 5;
	      break;
	    case OT_bh:
	      newsize = 6;
	      break;
	    case OT_sk:
	      newsize = 2;
	      break;
	    default:
	      newsize = oldsize;
	      break;
	    }
	  break;

	}
      fragP->fr_subtype = newsize;
      tprintf (" -> new %d old %d delta %d (external)\n", newsize, oldsize, newsize-oldsize);
      return newsize - oldsize;
    }

  if (sym_addr > mypc)
    addr0 += stretch;

  switch (fragP->tc_frag_data->relax[ri].type)
    {
    case  RL78_RELAX_BRANCH:
      disp = (int) addr0 - (int) mypc;

      switch (optype)
	{
	case OT_bt:
	  if (disp >= -128 && (disp - (oldsize-2)) <= 127)
	    newsize = 3;
	  else
	    newsize = 6;
	  break;
	case OT_bt_sfr:
	case OT_bt_es:
	  if (disp >= -128 && (disp - (oldsize-3)) <= 127)
	    newsize = 4;
	  else
	    newsize = 7;
	  break;
	case OT_bc:
	  if (disp >= -128 && (disp - (oldsize-1)) <= 127)
	    newsize = 2;
	  else
	    newsize = 5;
	  break;
	case OT_bh:
	  if (disp >= -128 && (disp - (oldsize-2)) <= 127)
	    newsize = 3;
	  else
	    newsize = 6;
	  break;
	case OT_sk:
	  newsize = 2;
	  break;
	default:
	  newsize = oldsize;
	  break;
	}
      break;
    }

  /* This prevents infinite loops in align-heavy sources.  */
  if (newsize < oldsize)
    {
      if (fragP->tc_frag_data->times_shrank > 10
         && fragP->tc_frag_data->times_grown > 10)
       newsize = oldsize;
      if (fragP->tc_frag_data->times_shrank < 20)
       fragP->tc_frag_data->times_shrank ++;
    }
  else if (newsize > oldsize)
    {
      if (fragP->tc_frag_data->times_grown < 20)
       fragP->tc_frag_data->times_grown ++;
    }

  fragP->fr_subtype = newsize;
  tprintf (" -> new %d old %d delta %d\n", newsize, oldsize, newsize-oldsize);
  return newsize - oldsize;
}

/* This lets us test for the opcode type and the desired size in a
   switch statement.  */
#define OPCODE(type,size) ((type) * 16 + (size))

/* Given the opcode stored in fr_opcode and the number of bytes we
   think we need, encode a new opcode.  We stored a pointer to the
   fixup for this opcode in the tc_frag_data structure.  If we can do
   the fixup here, we change the relocation type to "none" (we test
   for that in tc_gen_reloc) else we change it to the right type for
   the new (biggest) opcode.  */

void
md_convert_frag (bfd *   abfd ATTRIBUTE_UNUSED,
		 segT    segment ATTRIBUTE_UNUSED,
		 fragS * fragP ATTRIBUTE_UNUSED)
{
  rl78_bytesT * rl78b = fragP->tc_frag_data;
  addressT addr0, mypc;
  int disp;
  int reloc_type, reloc_adjust;
  char * op = fragP->fr_opcode;
  int keep_reloc = 0;
  int ri;
  int fi = (rl78b->n_fixups > 1) ? 1 : 0;
  fixS * fix = rl78b->fixups[fi].fixP;

  /* If we ever get more than one reloc per opcode, this is the one
     we're relaxing.  */
  ri = 0;

  /* We used a new frag for this opcode, so the opcode address should
     be the frag address.  */
  mypc = fragP->fr_address + (fragP->fr_opcode - fragP->fr_literal);
  tprintf ("\033[32mmypc: 0x%x\033[0m\n", (int)mypc);

  /* Try to get the target address.  If we fail here, we just use the
     largest format.  */
  if (rl78_frag_fix_value (fragP, segment, 0, & addr0,
			   fragP->tc_frag_data->relax[ri].type != RL78_RELAX_BRANCH, 0))
    {
      /* We don't know the target address.  */
      keep_reloc = 1;
      addr0 = 0;
      disp = 0;
      tprintf ("unknown addr ? - %x = ?\n", (int)mypc);
    }
  else
    {
      /* We know the target address, and it's in addr0.  */
      disp = (int) addr0 - (int) mypc;
      tprintf ("known addr %x - %x = %d\n", (int)addr0, (int)mypc, disp);
    }

  if (linkrelax)
    keep_reloc = 1;

  reloc_type = BFD_RELOC_NONE;
  reloc_adjust = 0;

  switch (fragP->tc_frag_data->relax[ri].type)
    {
    case RL78_RELAX_BRANCH:
      switch (OPCODE (rl78_opcode_type (fragP->fr_opcode), fragP->fr_subtype))
	{

	case OPCODE (OT_bt, 3): /* BT A,$ - no change.  */
	  disp -= 3;
	  op[2] = disp;
	  reloc_type = keep_reloc ? BFD_RELOC_8_PCREL : BFD_RELOC_NONE;
	  break;

	case OPCODE (OT_bt, 6): /* BT A,$ - long version.  */
	  disp -= 3;
	  op[1] ^= 0x06; /* toggle conditional.  */
	  op[2] = 3; /* displacement over long branch.  */
	  disp -= 3;
	  op[3] = 0xEE; /* BR $!addr20 */
	  op[4] = disp & 0xff;
	  op[5] = disp >> 8;
	  reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
	  reloc_adjust = 2;
	  break;

	case OPCODE (OT_bt_sfr, 4): /* BT PSW,$ - no change.  */
	  disp -= 4;
	  op[3] = disp;
	  reloc_type = keep_reloc ? BFD_RELOC_8_PCREL : BFD_RELOC_NONE;
	  break;

	case OPCODE (OT_bt_sfr, 7): /* BT PSW,$ - long version.  */
	  disp -= 4;
	  op[1] ^= 0x06; /* toggle conditional.  */
	  op[3] = 3; /* displacement over long branch.  */
	  disp -= 3;
	  op[4] = 0xEE; /* BR $!addr20 */
	  op[5] = disp & 0xff;
	  op[6] = disp >> 8;
	  reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
	  reloc_adjust = 2;
	  break;

	case OPCODE (OT_bt_es, 4): /* BT ES:[HL],$ - no change.  */
	  disp -= 4;
	  op[3] = disp;
	  reloc_type = keep_reloc ? BFD_RELOC_8_PCREL : BFD_RELOC_NONE;
	  break;

	case OPCODE (OT_bt_es, 7): /* BT PSW,$ - long version.  */
	  disp -= 4;
	  op[2] ^= 0x06; /* toggle conditional.  */
	  op[3] = 3; /* displacement over long branch.  */
	  disp -= 3;
	  op[4] = 0xEE; /* BR $!addr20 */
	  op[5] = disp & 0xff;
	  op[6] = disp >> 8;
	  reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
	  reloc_adjust = 2;
	  break;

	case OPCODE (OT_bc, 2): /* BC $ - no change.  */
	  disp -= 2;
	  op[1] = disp;
	  reloc_type = keep_reloc ? BFD_RELOC_8_PCREL : BFD_RELOC_NONE;
	  break;

	case OPCODE (OT_bc, 5): /* BC $ - long version.  */
	  disp -= 2;
	  op[0] ^= 0x02; /* toggle conditional.  */
	  op[1] = 3;
	  disp -= 3;
	  op[2] = 0xEE; /* BR $!addr20 */
	  op[3] = disp & 0xff;
	  op[4] = disp >> 8;
	  reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
	  reloc_adjust = 2;
	  break;

	case OPCODE (OT_bh, 3): /* BH $ - no change.  */
	  disp -= 3;
	  op[2] = disp;
	  reloc_type = keep_reloc ? BFD_RELOC_8_PCREL : BFD_RELOC_NONE;
	  break;

	case OPCODE (OT_bh, 6): /* BC $ - long version.  */
	  disp -= 3;
	  op[1] ^= 0x10; /* toggle conditional.  */
	  op[2] = 3;
	  disp -= 3;
	  op[3] = 0xEE; /* BR $!addr20 */
	  op[4] = disp & 0xff;
	  op[5] = disp >> 8;
	  reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
	  reloc_adjust = 2;
	  break;

	case OPCODE (OT_sk, 2): /* SK<cond> - no change */
	  reloc_type = keep_reloc ? BFD_RELOC_16_PCREL : BFD_RELOC_NONE;
	  break;

	default:
	  reloc_type = fix ? fix->fx_r_type : BFD_RELOC_NONE;
	  break;
	}
      break;

    default:
      if (rl78b->n_fixups)
	{
	  reloc_type = fix->fx_r_type;
	  reloc_adjust = 0;
	}
      break;
    }

  if (rl78b->n_fixups)
    {

      fix->fx_r_type = reloc_type;
      fix->fx_where += reloc_adjust;
      switch (reloc_type)
	{
	case BFD_RELOC_NONE:
	  fix->fx_size = 0;
	  break;
	case BFD_RELOC_8:
	  fix->fx_size = 1;
	  break;
	case BFD_RELOC_16_PCREL:
	  fix->fx_size = 2;
	  break;
	}
    }

  fragP->fr_fix = fragP->fr_subtype + (fragP->fr_opcode - fragP->fr_literal);
  tprintf ("fragP->fr_fix now %ld (%d + (%p - %p)\n", (long) fragP->fr_fix,
	  fragP->fr_subtype, fragP->fr_opcode, fragP->fr_literal);
  fragP->fr_var = 0;

  tprintf ("compare 0x%lx vs 0x%lx - 0x%lx = 0x%lx (%p)\n",
	   (long)fragP->fr_fix,
	   (long)fragP->fr_next->fr_address, (long)fragP->fr_address,
	   (long)(fragP->fr_next->fr_address - fragP->fr_address),
	   fragP->fr_next);

  if (fragP->fr_next != NULL
	  && ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
	      != fragP->fr_fix))
    as_bad (_("bad frag at %p : fix %ld addr %ld %ld \n"), fragP,
	    (long) fragP->fr_fix,
	    (long) fragP->fr_address, (long) fragP->fr_next->fr_address);
}

/* End of relaxation code.
  ----------------------------------------------------------------------*/


arelent **
tc_gen_reloc (asection * seg ATTRIBUTE_UNUSED, fixS * fixp)
{
  static arelent * reloc[8];
  int rp;

  if (fixp->fx_r_type == BFD_RELOC_NONE)
    {
      reloc[0] = NULL;
      return reloc;
    }

  if (fixp->fx_r_type == BFD_RELOC_RL78_RELAX && !linkrelax)
    {
      reloc[0] = NULL;
      return reloc;
    }

  if (fixp->fx_subsy
      && S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
    {
      fixp->fx_offset -= S_GET_VALUE (fixp->fx_subsy);
      fixp->fx_subsy = NULL;
    }

  reloc[0]		  = XNEW (arelent);
  reloc[0]->sym_ptr_ptr   = XNEW (asymbol *);
  * reloc[0]->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
  reloc[0]->address       = fixp->fx_frag->fr_address + fixp->fx_where;
  reloc[0]->addend        = fixp->fx_offset;

  if (fixp->fx_r_type == BFD_RELOC_RL78_32_OP
      && fixp->fx_subsy)
    {
      fixp->fx_r_type = BFD_RELOC_RL78_DIFF;
    }

#define OPX(REL,SYM,ADD)							\
  reloc[rp]		   = XNEW (arelent);		\
  reloc[rp]->sym_ptr_ptr   = XNEW (asymbol *);		\
  reloc[rp]->howto         = bfd_reloc_type_lookup (stdoutput, REL);		\
  reloc[rp]->addend        = ADD;						\
  * reloc[rp]->sym_ptr_ptr = SYM;						\
  reloc[rp]->address       = fixp->fx_frag->fr_address + fixp->fx_where;	\
  reloc[++rp] = NULL
#define OPSYM(SYM) OPX(BFD_RELOC_RL78_SYM, SYM, 0)

  /* FIXME: We cannot do the normal thing for an immediate value reloc,
     ie creating a RL78_SYM reloc in the *ABS* section with an offset
     equal to the immediate value we want to store.  This fails because
     the reloc processing in bfd_perform_relocation and bfd_install_relocation
     will short circuit such relocs and never pass them on to the special
     reloc processing code.  So instead we create a RL78_SYM reloc against
     the __rl78_abs__ symbol and arrange for the linker scripts to place
     this symbol at address 0.  */
#define OPIMM(IMM) OPX (BFD_RELOC_RL78_SYM, symbol_get_bfdsym (rl78_abs_sym), IMM)

#define OP(OP) OPX(BFD_RELOC_RL78_##OP, *reloc[0]->sym_ptr_ptr, 0)
#define SYM0() reloc[0]->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_RL78_SYM)

  rp = 1;

  /* Certain BFD relocations cannot be translated directly into
     a single (non-Red Hat) RL78 relocation, but instead need
     multiple RL78 relocations - handle them here.  */
  switch (fixp->fx_r_type)
    {
    case BFD_RELOC_RL78_DIFF:
      SYM0 ();
      OPSYM (symbol_get_bfdsym (fixp->fx_subsy));
      OP(OP_SUBTRACT);

      switch (fixp->fx_size)
	{
	case 1:
	  OP(ABS8);
	  break;
	case 2:
	  OP (ABS16);
	  break;
	case 4:
	  OP (ABS32);
	  break;
	}
      break;

    case BFD_RELOC_RL78_NEG32:
      SYM0 ();
      OP (OP_NEG);
      OP (ABS32);
      break;

    case BFD_RELOC_RL78_CODE:
      reloc[0]->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_RL78_16U);
      reloc[1] = NULL;
      break;

    case BFD_RELOC_RL78_LO16:
      SYM0 ();
      OPIMM (0xffff);
      OP (OP_AND);
      OP (ABS16);
      break;

    case BFD_RELOC_RL78_HI16:
      SYM0 ();
      OPIMM (16);
      OP (OP_SHRA);
      OP (ABS16);
      break;

    case BFD_RELOC_RL78_HI8:
      SYM0 ();
      OPIMM (16);
      OP (OP_SHRA);
      OPIMM (0xff);
      OP (OP_AND);
      OP (ABS8);
      break;

    default:
      reloc[0]->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
      reloc[1] = NULL;
      break;
    }

  return reloc;
}

int
rl78_validate_fix_sub (struct fix * f)
{
  /* We permit the subtraction of two symbols in a few cases.  */
  /* mov #sym1-sym2, R3 */
  if (f->fx_r_type == BFD_RELOC_RL78_32_OP)
    return 1;
  /* .long sym1-sym2 */
  if (f->fx_r_type == BFD_RELOC_RL78_DIFF
      && ! f->fx_pcrel
      && (f->fx_size == 4 || f->fx_size == 2 || f->fx_size == 1))
    return 1;
  return 0;
}

long
md_pcrel_from_section (fixS * fixP, segT sec)
{
  long rv;

  if (fixP->fx_addsy != NULL
      && (! S_IS_DEFINED (fixP->fx_addsy)
	  || S_GET_SEGMENT (fixP->fx_addsy) != sec))
    /* The symbol is undefined (or is defined but not in this section).
       Let the linker figure it out.  */
    return 0;

  rv = fixP->fx_frag->fr_address + fixP->fx_where;
  switch (fixP->fx_r_type)
    {
    case BFD_RELOC_8_PCREL:
      rv += 1;
      break;
    case BFD_RELOC_16_PCREL:
      rv += 2;
      break;
    default:
      break;
    }
  return rv;
}

void
md_apply_fix (struct fix * f ATTRIBUTE_UNUSED,
	      valueT *     t ATTRIBUTE_UNUSED,
	      segT         s ATTRIBUTE_UNUSED)
{
  char * op;
  unsigned long val;

  /* We always defer overflow checks for these to the linker, as it
     needs to do PLT stuff.  */
  if (f->fx_r_type == BFD_RELOC_RL78_CODE)
    f->fx_no_overflow = 1;

  if (f->fx_addsy && S_FORCE_RELOC (f->fx_addsy, 1))
    return;
  if (f->fx_subsy && S_FORCE_RELOC (f->fx_subsy, 1))
    return;

  op = f->fx_frag->fr_literal + f->fx_where;
  val = (unsigned long) * t;

  if (f->fx_addsy == NULL)
    f->fx_done = 1;

  switch (f->fx_r_type)
    {
    case BFD_RELOC_NONE:
      break;

    case BFD_RELOC_RL78_RELAX:
      f->fx_done = 0;
      break;

    case BFD_RELOC_8_PCREL:
      if ((long)val < -128 || (long)val > 127)
	as_bad_where (f->fx_file, f->fx_line,
		      _("value of %ld too large for 8-bit branch"),
		      val);
      /* Fall through.  */
    case BFD_RELOC_8:
    case BFD_RELOC_RL78_SADDR: /* We need to store the 8 LSB, but this works.  */
      op[0] = val;
      break;

    case BFD_RELOC_16_PCREL:
      if ((long)val < -32768 || (long)val > 32767)
	as_bad_where (f->fx_file, f->fx_line,
		      _("value of %ld too large for 16-bit branch"),
		      val);
      /* Fall through.  */
    case BFD_RELOC_16:
    case BFD_RELOC_RL78_CODE:
      op[0] = val;
      op[1] = val >> 8;
      break;

    case BFD_RELOC_24:
      op[0] = val;
      op[1] = val >> 8;
      op[2] = val >> 16;
      break;

    case BFD_RELOC_32:
      op[0] = val;
      op[1] = val >> 8;
      op[2] = val >> 16;
      op[3] = val >> 24;
      break;

    case BFD_RELOC_RL78_DIFF:
      op[0] = val;
      if (f->fx_size > 1)
	op[1] = val >> 8;
      if (f->fx_size > 2)
	op[2] = val >> 16;
      if (f->fx_size > 3)
	op[3] = val >> 24;
      break;

    case BFD_RELOC_RL78_HI8:
      val = val >> 16;
      op[0] = val;
      break;

    case BFD_RELOC_RL78_HI16:
      val = val >> 16;
      op[0] = val;
      op[1] = val >> 8;
      break;

    case BFD_RELOC_RL78_LO16:
      op[0] = val;
      op[1] = val >> 8;
      break;

    default:
      as_bad (_("Unknown reloc in md_apply_fix: %s"),
	      bfd_get_reloc_code_name (f->fx_r_type));
      break;
    }

}

valueT
md_section_align (segT segment, valueT size)
{
  int align = bfd_get_section_alignment (stdoutput, segment);
  return ((size + (1 << align) - 1) & -(1 << align));
}