aboutsummaryrefslogtreecommitdiff
path: root/binutils/unwind-ia64.c
blob: 3b05c77312ed75c9c296d27cf9d4da6d5850e74f (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
/* unwind-ia64.c -- utility routines to dump IA-64 unwind info for readelf.
   Copyright 2000, 2001 Free Software Foundation, Inc.
	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>

This file is part of GNU Binutils.

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

#include "unwind-ia64.h"
#include <stdio.h>
#include <string.h>

#if __GNUC__ >= 2
/* Define BFD64 here, even if our default architecture is 32 bit ELF
   as this will allow us to read in and parse 64bit and 32bit ELF files.
   Only do this if we belive that the compiler can support a 64 bit
   data type.  For now we only rely on GCC being able to do this.  */
#define BFD64
#endif
#include "bfd.h"

static bfd_vma unw_rlen = 0;

static void
unw_print_brmask (cp, mask)
     char * cp;
     unsigned char mask;
{
  char *sep = "";
  int i;

  for (i = 0; mask && (i < 5); ++i)
    {
      if (mask & 1)
	{
	  cp += sprintf (cp, "%sb%u", sep, i + 1);
	  sep = ",";
	}
      mask >>= 1;
    }
  *cp = '\0';
}

static void
unw_print_grmask (cp, mask)
     char * cp;
     unsigned char mask;
{
  char *sep = "";
  int i;

  *cp = '\0';
  for (i = 0; i < 4; ++i)
    {
      if (mask & 1)
	{
	  cp += sprintf (cp, "%sr%u", sep, i + 4);
	  sep = ",";
	}
      mask >>= 1;
    }
}

static void
unw_print_frmask (cp, mask)
     char * cp;
     unsigned long mask;
{
  char *sep = "";
  int i;

  *cp = '\0';
  for (i = 0; i < 20; ++i)
    {
      if (mask & 1)
	{
	  cp += sprintf (cp, "%sf%u", sep, (i < 4) ? (i + 2) : (i + 12));
	  sep = ",";
	}
      mask >>= 1;
    }
}

static void
unw_print_abreg (cp, abreg)
     char * cp;
     unsigned char abreg;
{
  static const char *special_reg[16] =
  {
    "pr", "psp", "@priunat", "rp", "ar.bsp", "ar.bspstore", "ar.rnat",
    "ar.unat", "ar.fpsr", "ar.pfs", "ar.lc",
    "Unknown11", "Unknown12", "Unknown13", "Unknown14", "Unknown15"
  };

  switch ((abreg >> 5) & 0x3)
    {
    case 0: /* gr */
      sprintf (cp, "r%u", (abreg & 0x1f));
      break;

    case 1: /* fr */
      sprintf (cp, "f%u", (abreg & 0x1f));
      break;

    case 2: /* br */
      sprintf (cp, "b%u", (abreg & 0x1f));
      break;

    case 3: /* special */
      strcpy (cp, special_reg[abreg & 0xf]);
      break;
    }
}

static void
unw_print_xyreg (cp, x, ytreg)
     char *        cp;
     unsigned char x;
     unsigned char ytreg;
{
  switch ((x << 1) | ((ytreg >> 7) & 1))
    {
    case 0: /* gr */
      sprintf (cp, "r%u", (ytreg & 0x1f));
      break;

    case 1: /* fr */
      sprintf (cp, "f%u", (ytreg & 0x1f));
      break;

    case 2: /* br */
      sprintf (cp, "b%u", (ytreg & 0x1f));
      break;
    }
}

#define UNW_REG_BSP		"bsp"
#define UNW_REG_BSPSTORE	"bspstore"
#define UNW_REG_FPSR		"fpsr"
#define UNW_REG_LC		"lc"
#define UNW_REG_PFS		"pfs"
#define UNW_REG_PR		"pr"
#define UNW_REG_PSP		"psp"
#define UNW_REG_RNAT		"rnat"
#define UNW_REG_RP		"rp"
#define UNW_REG_UNAT		"unat"

typedef bfd_vma unw_word;

#define UNW_DEC_BAD_CODE(code)			\
    printf ("Unknown code 0x%02x\n", code)

#define UNW_DEC_PROLOGUE(fmt, body, rlen, arg)					\
  do										\
    {										\
      unw_rlen = rlen;								\
      *(int *)arg = body;							\
      printf ("    %s:%s(rlen=%lu)\n",						\
	      fmt, body ? "body" : "prologue", (unsigned long) rlen);		\
    }										\
  while (0)

#define UNW_DEC_PROLOGUE_GR(fmt, rlen, mask, grsave, arg)			\
  do										\
    {										\
      char regname[16], maskstr[64], *sep;					\
										\
      unw_rlen = rlen;								\
      *(int *)arg = 0;								\
										\
      maskstr[0] = '\0';							\
      sep = "";									\
      if (mask & 0x8)								\
	{									\
	  strcat (maskstr, "rp");						\
	  sep = ",";								\
	}									\
      if (mask & 0x4)								\
	{									\
	  strcat (maskstr, sep);						\
	  strcat (maskstr, "ar.pfs");						\
	  sep = ",";								\
	}									\
      if (mask & 0x2)								\
	{									\
	  strcat (maskstr, sep);						\
	  strcat (maskstr, "psp");						\
	  sep = ",";								\
	}									\
      if (mask & 0x1)								\
	{									\
	  strcat (maskstr, sep);						\
	  strcat (maskstr, "pr");						\
	}									\
      sprintf (regname, "r%u", grsave);						\
      printf ("    %s:prologue_gr(mask=[%s],grsave=%s,rlen=%lu)\n",		\
	      fmt, maskstr, regname, (unsigned long) rlen);			\
    }										\
  while (0)

#define UNW_DEC_FR_MEM(fmt, frmask, arg)			\
  do								\
    {								\
      char frstr[200];						\
								\
      unw_print_frmask (frstr, frmask);				\
      printf ("\t%s:fr_mem(frmask=[%s])\n", fmt, frstr);	\
    }								\
  while (0)

#define UNW_DEC_GR_MEM(fmt, grmask, arg)			\
  do								\
    {								\
      char grstr[200];						\
								\
      unw_print_grmask (grstr, grmask);				\
      printf ("\t%s:gr_mem(grmask=[%s])\n", fmt, grstr);	\
    }								\
  while (0)

#define UNW_DEC_FRGR_MEM(fmt, grmask, frmask, arg)			     	\
  do										\
    {									     	\
      char frstr[200], grstr[20];						\
									     	\
      unw_print_grmask (grstr, grmask);					     	\
      unw_print_frmask (frstr, frmask);					     	\
      printf ("\t%s:frgr_mem(grmask=[%s],frmask=[%s])\n", fmt, grstr, frstr);	\
    }										\
  while (0)

#define UNW_DEC_BR_MEM(fmt, brmask, arg)				\
  do									\
    {									\
      char brstr[20];							\
									\
      unw_print_brmask (brstr, brmask);					\
      printf ("\t%s:br_mem(brmask=[%s])\n", fmt, brstr);		\
    }									\
  while (0)

#define UNW_DEC_BR_GR(fmt, brmask, gr, arg)				\
  do									\
    {									\
      char brstr[20];							\
									\
      unw_print_brmask (brstr, brmask);					\
      printf ("\t%s:br_gr(brmask=[%s],gr=r%u)\n", fmt, brstr, gr);	\
    }									\
  while (0)

#define UNW_DEC_REG_GR(fmt, src, dst, arg)		\
  printf ("\t%s:%s_gr(reg=r%u)\n", fmt, src, dst)

#define UNW_DEC_RP_BR(fmt, dst, arg)		\
  printf ("\t%s:rp_br(reg=b%u)\n", fmt, dst)

#define UNW_DEC_REG_WHEN(fmt, reg, t, arg)				\
  printf ("\t%s:%s_when(t=%lu)\n", fmt, reg, (unsigned long) t)

#define UNW_DEC_REG_SPREL(fmt, reg, spoff, arg)		\
  printf ("\t%s:%s_sprel(spoff=0x%lx)\n",		\
	  fmt, reg, 4*(unsigned long)spoff)

#define UNW_DEC_REG_PSPREL(fmt, reg, pspoff, arg)		\
  printf ("\t%s:%s_psprel(pspoff=0x10-0x%lx)\n",		\
	  fmt, reg, 4*(unsigned long)pspoff)

#define UNW_DEC_GR_GR(fmt, grmask, gr, arg)				\
  do									\
    {									\
      char grstr[20];							\
									\
      unw_print_grmask (grstr, grmask);					\
      printf ("\t%s:gr_gr(grmask=[%s],r%u)\n", fmt, grstr, gr);		\
    }									\
  while (0)

#define UNW_DEC_ABI(fmt, abi, context, arg)			\
  do								\
    {								\
      static const char *abiname[] =				\
      {								\
	"@svr4", "@hpux", "@nt"					\
      };							\
      char buf[20];						\
      const char *abistr = buf;					\
								\
      if (abi < 3)						\
	abistr = abiname[abi];					\
      else							\
	sprintf (buf, "0x%x", abi);				\
      printf ("\t%s:unwabi(abi=%s,context=0x%02x)\n",		\
	      fmt, abistr, context);				\
    }								\
  while (0)

#define UNW_DEC_PRIUNAT_GR(fmt, r, arg)		\
  printf ("\t%s:priunat_gr(reg=r%u)\n", fmt, r)

#define UNW_DEC_PRIUNAT_WHEN_GR(fmt, t, arg)				\
  printf ("\t%s:priunat_when_gr(t=%lu)\n", fmt, (unsigned long) t)

#define UNW_DEC_PRIUNAT_WHEN_MEM(fmt, t, arg)				\
  printf ("\t%s:priunat_when_mem(t=%lu)\n", fmt, (unsigned long) t)

#define UNW_DEC_PRIUNAT_PSPREL(fmt, pspoff, arg)		\
  printf ("\t%s:priunat_psprel(pspoff=0x10-0x%lx)\n",		\
	  fmt, 4*(unsigned long)pspoff)

#define UNW_DEC_PRIUNAT_SPREL(fmt, spoff, arg)		\
  printf ("\t%s:priunat_sprel(spoff=0x%lx)\n",		\
	  fmt, 4*(unsigned long)spoff)

#define UNW_DEC_MEM_STACK_F(fmt, t, size, arg)		\
  printf ("\t%s:mem_stack_f(t=%lu,size=%lu)\n",		\
	  fmt, (unsigned long) t, 16*(unsigned long)size)

#define UNW_DEC_MEM_STACK_V(fmt, t, arg)				\
  printf ("\t%s:mem_stack_v(t=%lu)\n", fmt, (unsigned long) t)

#define UNW_DEC_SPILL_BASE(fmt, pspoff, arg)			\
  printf ("\t%s:spill_base(pspoff=0x10-0x%lx)\n",		\
	  fmt, 4*(unsigned long)pspoff)

#define UNW_DEC_SPILL_MASK(fmt, dp, arg)					\
  do										\
    {										\
      static const char * spill_type = "-frb";					\
      unsigned const char * imaskp = dp;					\
      unsigned char mask = 0;							\
      bfd_vma insn = 0;								\
										\
      printf ("\t%s:spill_mask(imask=[", fmt);					\
      for (insn = 0; insn < unw_rlen; ++insn)					\
	{									\
	  if ((insn % 4) == 0)							\
	    mask = *imaskp++;							\
	  if (insn > 0 && (insn % 3) == 0)					\
	    putchar (',');							\
	  putchar (spill_type[(mask >> (2 * (3 - (insn & 0x3)))) & 0x3]);	\
	}									\
      printf ("])\n");								\
      dp = imaskp;								\
    }										\
  while (0)

#define UNW_DEC_SPILL_SPREL(fmt, t, abreg, spoff, arg)				\
  do										\
    {										\
      char regname[10];								\
										\
      unw_print_abreg (regname, abreg);						\
      printf ("\t%s:spill_sprel(reg=%s,t=%lu,spoff=0x%lx)\n",			\
	      fmt, regname, (unsigned long) t, 4*(unsigned long)off);		\
    }										\
  while (0)

#define UNW_DEC_SPILL_PSPREL(fmt, t, abreg, pspoff, arg)		 	\
  do										\
    {									 	\
      char regname[10];							 	\
									 	\
      unw_print_abreg (regname, abreg);					 	\
      printf ("\t%s:spill_psprel(reg=%s,t=%lu,pspoff=0x10-0x%lx)\n", 		\
	      fmt, regname, (unsigned long) t, 4*(unsigned long)pspoff);	\
    }										\
  while (0)

#define UNW_DEC_RESTORE(fmt, t, abreg, arg)			\
  do								\
    {								\
      char regname[10];						\
								\
      unw_print_abreg (regname, abreg);				\
      printf ("\t%s:restore(t=%lu,reg=%s)\n",			\
	      fmt, (unsigned long) t, regname);			\
    }								\
  while (0)

#define UNW_DEC_SPILL_REG(fmt, t, abreg, x, ytreg, arg)		\
  do								\
    {								\
      char abregname[10], tregname[10];				\
								\
      unw_print_abreg (abregname, abreg);			\
      unw_print_xyreg (tregname, x, ytreg);			\
      printf ("\t%s:spill_reg(t=%lu,reg=%s,treg=%s)\n",		\
	      fmt, (unsigned long) t, abregname, tregname);	\
    }								\
  while (0)

#define UNW_DEC_SPILL_SPREL_P(fmt, qp, t, abreg, spoff, arg)		   	    \
  do										    \
    {									   	    \
      char regname[20];							   	    \
									   	    \
      unw_print_abreg (regname, abreg);					   	    \
      printf ("\t%s:spill_sprel_p(qp=p%u,t=%lu,reg=%s,spoff=0x%lx)\n",		    \
	      fmt, qp, (unsigned long) t, regname, 4 * (unsigned long)spoff);	    \
    }										    \
  while (0)

#define UNW_DEC_SPILL_PSPREL_P(fmt, qp, t, abreg, pspoff, arg)		\
  do									\
    {									\
      char regname[20];							\
									\
      unw_print_abreg (regname, abreg);					\
      printf ("\t%s:spill_psprel_p(qp=p%u,t=%lu,reg=%s,pspoff=0x10-0x%lx)\n",\
	      fmt, qp, (unsigned long) t, regname, 4*(unsigned long)pspoff);\
    }									\
  while (0)

#define UNW_DEC_RESTORE_P(fmt, qp, t, abreg, arg)			\
  do									\
    {									\
      char regname[20];							\
									\
      unw_print_abreg (regname, abreg);					\
      printf ("\t%s:restore_p(qp=p%u,t=%lu,reg=%s)\n",			\
	      fmt, qp, (unsigned long) t, regname);			\
    }									\
  while (0)

#define UNW_DEC_SPILL_REG_P(fmt, qp, t, abreg, x, ytreg, arg)		\
  do									\
    {									\
      char regname[20], tregname[20];					\
									\
      unw_print_abreg (regname, abreg);					\
      unw_print_xyreg (tregname, x, ytreg);				\
      printf ("\t%s:spill_reg_p(qp=p%u,t=%lu,reg=%s,treg=%s)\n",	\
	      fmt, qp, (unsigned long) t, regname, tregname);		\
    }									\
  while (0)

#define UNW_DEC_LABEL_STATE(fmt, label, arg)				\
  printf ("\t%s:label_state(label=%lu)\n", fmt, (unsigned long) label)

#define UNW_DEC_COPY_STATE(fmt, label, arg)				\
  printf ("\t%s:copy_state(label=%lu)\n", fmt, (unsigned long) label)

#define UNW_DEC_EPILOGUE(fmt, t, ecount, arg)		\
  printf ("\t%s:epilogue(t=%lu,ecount=%lu)\n",		\
	  fmt, (unsigned long) t, (unsigned long) ecount)

/*
 * Generic IA-64 unwind info decoder.
 *
 * This file is used both by the Linux kernel and objdump.  Please
 * keep the two copies of this file in sync (modulo differences in the
 * prototypes...).
 *
 * You need to customize the decoder by defining the following
 * macros/constants before including this file:
 *
 *  Types:
 *	unw_word	Unsigned integer type with at least 64 bits 
 *
 *  Register names:
 *	UNW_REG_BSP
 *	UNW_REG_BSPSTORE
 *	UNW_REG_FPSR
 *	UNW_REG_LC
 *	UNW_REG_PFS
 *	UNW_REG_PR
 *	UNW_REG_RNAT
 *	UNW_REG_PSP
 *	UNW_REG_RP
 *	UNW_REG_UNAT
 *
 *  Decoder action macros:
 *	UNW_DEC_BAD_CODE(code)
 *	UNW_DEC_ABI(fmt,abi,context,arg)
 *	UNW_DEC_BR_GR(fmt,brmask,gr,arg)
 *	UNW_DEC_BR_MEM(fmt,brmask,arg)
 *	UNW_DEC_COPY_STATE(fmt,label,arg)
 *	UNW_DEC_EPILOGUE(fmt,t,ecount,arg)
 *	UNW_DEC_FRGR_MEM(fmt,grmask,frmask,arg)
 *	UNW_DEC_FR_MEM(fmt,frmask,arg)
 *	UNW_DEC_GR_GR(fmt,grmask,gr,arg)
 *	UNW_DEC_GR_MEM(fmt,grmask,arg)
 *	UNW_DEC_LABEL_STATE(fmt,label,arg)
 *	UNW_DEC_MEM_STACK_F(fmt,t,size,arg)
 *	UNW_DEC_MEM_STACK_V(fmt,t,arg)
 *	UNW_DEC_PRIUNAT_GR(fmt,r,arg)
 *	UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg)
 *	UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg)
 *	UNW_DEC_PRIUNAT_WHEN_PSPREL(fmt,pspoff,arg)
 *	UNW_DEC_PRIUNAT_WHEN_SPREL(fmt,spoff,arg)
 *	UNW_DEC_PROLOGUE(fmt,body,rlen,arg)
 *	UNW_DEC_PROLOGUE_GR(fmt,rlen,mask,grsave,arg)
 *	UNW_DEC_REG_PSPREL(fmt,reg,pspoff,arg)
 *	UNW_DEC_REG_REG(fmt,src,dst,arg)
 *	UNW_DEC_REG_SPREL(fmt,reg,spoff,arg)
 *	UNW_DEC_REG_WHEN(fmt,reg,t,arg)
 *	UNW_DEC_RESTORE(fmt,t,abreg,arg)
 *	UNW_DEC_RESTORE_P(fmt,qp,t,abreg,arg)
 *	UNW_DEC_SPILL_BASE(fmt,pspoff,arg)
 *	UNW_DEC_SPILL_MASK(fmt,imaskp,arg)
 *	UNW_DEC_SPILL_PSPREL(fmt,t,abreg,pspoff,arg)
 *	UNW_DEC_SPILL_PSPREL_P(fmt,qp,t,abreg,pspoff,arg)
 *	UNW_DEC_SPILL_REG(fmt,t,abreg,x,ytreg,arg)
 *	UNW_DEC_SPILL_REG_P(fmt,qp,t,abreg,x,ytreg,arg)
 *	UNW_DEC_SPILL_SPREL(fmt,t,abreg,spoff,arg)
 *	UNW_DEC_SPILL_SPREL_P(fmt,qp,t,abreg,pspoff,arg)
 */

static unw_word unw_decode_uleb128 PARAMS ((const unsigned char **));
static const unsigned char *unw_decode_x1 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_x2 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_x3 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_x4 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_r1 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_r2 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_r3 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_p1 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_p2_p5 PARAMS ((const unsigned char *,
						      unsigned char, void *));
static const unsigned char *unw_decode_p6 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_p7_p10 PARAMS ((const unsigned char *,
						       unsigned char, void *));
static const unsigned char *unw_decode_b1 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_b2 PARAMS ((const unsigned char *,
						   unsigned char, void *));
static const unsigned char *unw_decode_b3_x4 PARAMS ((const unsigned char *,
						      unsigned char, void *));

static unw_word
unw_decode_uleb128 (dpp)
     const unsigned char **dpp;
{
  unsigned shift = 0;
  unw_word byte, result = 0;
  const unsigned char *bp = *dpp;

  while (1)
    {
      byte = *bp++;
      result |= (byte & 0x7f) << shift;

      if ((byte & 0x80) == 0)
	break;

      shift += 7;
    }

  *dpp = bp;

  return result;
}

static const unsigned char *
unw_decode_x1 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unsigned char byte1, abreg;
  unw_word t, off;

  byte1 = *dp++;
  t = unw_decode_uleb128 (&dp);
  off = unw_decode_uleb128 (&dp);
  abreg = (byte1 & 0x7f);
  if (byte1 & 0x80)
    UNW_DEC_SPILL_SPREL ("X1", t, abreg, off, arg);
  else
    UNW_DEC_SPILL_PSPREL ("X1", t, abreg, off, arg);
  return dp;
}

static const unsigned char *
unw_decode_x2 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unsigned char byte1, byte2, abreg, x, ytreg;
  unw_word t;

  byte1 = *dp++;
  byte2 = *dp++;
  t = unw_decode_uleb128 (&dp);
  abreg = (byte1 & 0x7f);
  ytreg = byte2;
  x = (byte1 >> 7) & 1;
  if ((byte1 & 0x80) == 0 && ytreg == 0)
    UNW_DEC_RESTORE ("X2", t, abreg, arg);
  else
    UNW_DEC_SPILL_REG ("X2", t, abreg, x, ytreg, arg);
  return dp;
}

static const unsigned char *
unw_decode_x3 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unsigned char byte1, byte2, abreg, qp;
  unw_word t, off;

  byte1 = *dp++;
  byte2 = *dp++;
  t = unw_decode_uleb128 (&dp);
  off = unw_decode_uleb128 (&dp);

  qp = (byte1 & 0x3f);
  abreg = (byte2 & 0x7f);

  if (byte1 & 0x80)
    UNW_DEC_SPILL_SPREL_P ("X3", qp, t, abreg, off, arg);
  else
    UNW_DEC_SPILL_PSPREL_P ("X3", qp, t, abreg, off, arg);
  return dp;
}

static const unsigned char *
unw_decode_x4 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unsigned char byte1, byte2, byte3, qp, abreg, x, ytreg;
  unw_word t;

  byte1 = *dp++;
  byte2 = *dp++;
  byte3 = *dp++;
  t = unw_decode_uleb128 (&dp);

  qp = (byte1 & 0x3f);
  abreg = (byte2 & 0x7f);
  x = (byte2 >> 7) & 1;
  ytreg = byte3;

  if ((byte2 & 0x80) == 0 && byte3 == 0)
    UNW_DEC_RESTORE_P ("X4", qp, t, abreg, arg);
  else
    UNW_DEC_SPILL_REG_P ("X4", qp, t, abreg, x, ytreg, arg);
  return dp;
}

static const unsigned char *
unw_decode_r1 (dp, code, arg)
     const unsigned char *dp;
     unsigned char code;
     void *arg;
{
  int body = (code & 0x20) != 0;
  unw_word rlen;

  rlen = (code & 0x1f);
  UNW_DEC_PROLOGUE ("R1", body, rlen, arg);
  return dp;
}

static const unsigned char *
unw_decode_r2 (dp, code, arg)
     const unsigned char *dp;
     unsigned char code;
     void *arg;
{
  unsigned char byte1, mask, grsave;
  unw_word rlen;

  byte1 = *dp++;

  mask = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
  grsave = (byte1 & 0x7f);
  rlen = unw_decode_uleb128 (& dp);
  UNW_DEC_PROLOGUE_GR ("R2", rlen, mask, grsave, arg);
  return dp;
}

static const unsigned char *
unw_decode_r3 (dp, code, arg)
     const unsigned char *dp;
     unsigned char code;
     void *arg;
{
  unw_word rlen;

  rlen = unw_decode_uleb128 (& dp);
  UNW_DEC_PROLOGUE ("R3", ((code & 0x3) == 1), rlen, arg);
  return dp;
}

static const unsigned char *
unw_decode_p1 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unsigned char brmask = (code & 0x1f);

  UNW_DEC_BR_MEM ("P1", brmask, arg);
  return dp;
}

static const unsigned char *
unw_decode_p2_p5 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  if ((code & 0x10) == 0)
    {
      unsigned char byte1 = *dp++;

      UNW_DEC_BR_GR ("P2", ((code & 0xf) << 1) | ((byte1 >> 7) & 1),
		     (byte1 & 0x7f), arg);
    }
  else if ((code & 0x08) == 0)
    {
      unsigned char byte1 = *dp++, r, dst;

      r = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
      dst = (byte1 & 0x7f);
      switch (r)
	{
	case 0:
	  UNW_DEC_REG_GR ("P3", UNW_REG_PSP, dst, arg);
	  break;
	case 1:
	  UNW_DEC_REG_GR ("P3", UNW_REG_RP, dst, arg);
	  break;
	case 2:
	  UNW_DEC_REG_GR ("P3", UNW_REG_PFS, dst, arg);
	  break;
	case 3:
	  UNW_DEC_REG_GR ("P3", UNW_REG_PR, dst, arg);
	  break;
	case 4:
	  UNW_DEC_REG_GR ("P3", UNW_REG_UNAT, dst, arg);
	  break;
	case 5:
	  UNW_DEC_REG_GR ("P3", UNW_REG_LC, dst, arg);
	  break;
	case 6:
	  UNW_DEC_RP_BR ("P3", dst, arg);
	  break;
	case 7:
	  UNW_DEC_REG_GR ("P3", UNW_REG_RNAT, dst, arg);
	  break;
	case 8:
	  UNW_DEC_REG_GR ("P3", UNW_REG_BSP, dst, arg);
	  break;
	case 9:
	  UNW_DEC_REG_GR ("P3", UNW_REG_BSPSTORE, dst, arg);
	  break;
	case 10:
	  UNW_DEC_REG_GR ("P3", UNW_REG_FPSR, dst, arg);
	  break;
	case 11:
	  UNW_DEC_PRIUNAT_GR ("P3", dst, arg);
	  break;
	default:
	  UNW_DEC_BAD_CODE (r);
	  break;
	}
    }
  else if ((code & 0x7) == 0)
    UNW_DEC_SPILL_MASK ("P4", dp, arg);
  else if ((code & 0x7) == 1)
    {
      unw_word grmask, frmask, byte1, byte2, byte3;

      byte1 = *dp++;
      byte2 = *dp++;
      byte3 = *dp++;
      grmask = ((byte1 >> 4) & 0xf);
      frmask = ((byte1 & 0xf) << 16) | (byte2 << 8) | byte3;
      UNW_DEC_FRGR_MEM ("P5", grmask, frmask, arg);
    }
  else
    UNW_DEC_BAD_CODE (code);

  return dp;
}

static const unsigned char *
unw_decode_p6 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  int gregs = (code & 0x10) != 0;
  unsigned char mask = (code & 0x0f);

  if (gregs)
    UNW_DEC_GR_MEM ("P6", mask, arg);
  else
    UNW_DEC_FR_MEM ("P6", mask, arg);
  return dp;
}

static const unsigned char *
unw_decode_p7_p10 (dp, code, arg)
     const unsigned char *dp;
     unsigned char code;
     void *arg;
{
  unsigned char r, byte1, byte2;
  unw_word t, size;

  if ((code & 0x10) == 0)
    {
      r = (code & 0xf);
      t = unw_decode_uleb128 (&dp);
      switch (r)
	{
	case 0:
	  size = unw_decode_uleb128 (&dp);
	  UNW_DEC_MEM_STACK_F ("P7", t, size, arg);
	  break;

	case 1:
	  UNW_DEC_MEM_STACK_V ("P7", t, arg);
	  break;
	case 2:
	  UNW_DEC_SPILL_BASE ("P7", t, arg);
	  break;
	case 3:
	  UNW_DEC_REG_SPREL ("P7", UNW_REG_PSP, t, arg);
	  break;
	case 4:
	  UNW_DEC_REG_WHEN ("P7", UNW_REG_RP, t, arg);
	  break;
	case 5:
	  UNW_DEC_REG_PSPREL ("P7", UNW_REG_RP, t, arg);
	  break;
	case 6:
	  UNW_DEC_REG_WHEN ("P7", UNW_REG_PFS, t, arg);
	  break;
	case 7:
	  UNW_DEC_REG_PSPREL ("P7", UNW_REG_PFS, t, arg);
	  break;
	case 8:
	  UNW_DEC_REG_WHEN ("P7", UNW_REG_PR, t, arg);
	  break;
	case 9:
	  UNW_DEC_REG_PSPREL ("P7", UNW_REG_PR, t, arg);
	  break;
	case 10:
	  UNW_DEC_REG_WHEN ("P7", UNW_REG_LC, t, arg);
	  break;
	case 11:
	  UNW_DEC_REG_PSPREL ("P7", UNW_REG_LC, t, arg);
	  break;
	case 12:
	  UNW_DEC_REG_WHEN ("P7", UNW_REG_UNAT, t, arg);
	  break;
	case 13:
	  UNW_DEC_REG_PSPREL ("P7", UNW_REG_UNAT, t, arg);
	  break;
	case 14:
	  UNW_DEC_REG_WHEN ("P7", UNW_REG_FPSR, t, arg);
	  break;
	case 15:
	  UNW_DEC_REG_PSPREL ("P7", UNW_REG_FPSR, t, arg);
	  break;
	default:
	  UNW_DEC_BAD_CODE (r);
	  break;
	}
    }
  else
    {
      switch (code & 0xf)
	{
	case 0x0:		/* p8 */
	  {
	    r = *dp++;
	    t = unw_decode_uleb128 (&dp);
	    switch (r)
	      {
	      case 1:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_RP, t, arg);
		break;
	      case 2:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_PFS, t, arg);
		break;
	      case 3:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_PR, t, arg);
		break;
	      case 4:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_LC, t, arg);
		break;
	      case 5:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_UNAT, t, arg);
		break;
	      case 6:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_FPSR, t, arg);
		break;
	      case 7:
		UNW_DEC_REG_WHEN ("P8", UNW_REG_BSP, t, arg);
		break;
	      case 8:
		UNW_DEC_REG_PSPREL ("P8", UNW_REG_BSP, t, arg);
		break;
	      case 9:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_BSP, t, arg);
		break;
	      case 10:
		UNW_DEC_REG_WHEN ("P8", UNW_REG_BSPSTORE, t, arg);
		break;
	      case 11:
		UNW_DEC_REG_PSPREL ("P8", UNW_REG_BSPSTORE, t, arg);
		break;
	      case 12:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_BSPSTORE, t, arg);
		break;
	      case 13:
		UNW_DEC_REG_WHEN ("P8", UNW_REG_RNAT, t, arg);
		break;
	      case 14:
		UNW_DEC_REG_PSPREL ("P8", UNW_REG_RNAT, t, arg);
		break;
	      case 15:
		UNW_DEC_REG_SPREL ("P8", UNW_REG_RNAT, t, arg);
		break;
	      case 16:
		UNW_DEC_PRIUNAT_WHEN_GR ("P8", t, arg);
		break;
	      case 17:
		UNW_DEC_PRIUNAT_PSPREL ("P8", t, arg);
		break;
	      case 18:
		UNW_DEC_PRIUNAT_SPREL ("P8", t, arg);
		break;
	      case 19:
		UNW_DEC_PRIUNAT_WHEN_MEM ("P8", t, arg);
		break;
	      default:
		UNW_DEC_BAD_CODE (r);
		break;
	      }
	  }
	  break;

	case 0x1:
	  byte1 = *dp++;
	  byte2 = *dp++;
	  UNW_DEC_GR_GR ("P9", (byte1 & 0xf), (byte2 & 0x7f), arg);
	  break;

	case 0xf:		/* p10 */
	  byte1 = *dp++;
	  byte2 = *dp++;
	  UNW_DEC_ABI ("P10", byte1, byte2, arg);
	  break;

	case 0x9:
	  return unw_decode_x1 (dp, code, arg);

	case 0xa:
	  return unw_decode_x2 (dp, code, arg);

	case 0xb:
	  return unw_decode_x3 (dp, code, arg);

	case 0xc:
	  return unw_decode_x4 (dp, code, arg);

	default:
	  UNW_DEC_BAD_CODE (code);
	  break;
	}
    }
  return dp;
}

static const unsigned char *
unw_decode_b1 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unw_word label = (code & 0x1f);

  if ((code & 0x20) != 0)
    UNW_DEC_COPY_STATE ("B1", label, arg);
  else
    UNW_DEC_LABEL_STATE ("B1", label, arg);
  return dp;
}

static const unsigned char *
unw_decode_b2 (dp, code, arg)
     const unsigned char * dp;
     unsigned char         code;
     void *                arg ATTRIBUTE_UNUSED;
{
  unw_word t;

  t = unw_decode_uleb128 (& dp);
  UNW_DEC_EPILOGUE ("B2", t, (code & 0x1f), arg);
  return dp;
}

static const unsigned char *
unw_decode_b3_x4 (dp, code, arg)
     const unsigned char *dp;
     unsigned char code;
     void *arg;
{
  unw_word t, ecount, label;

  if ((code & 0x10) == 0)
    {
      t = unw_decode_uleb128 (&dp);
      ecount = unw_decode_uleb128 (&dp);
      UNW_DEC_EPILOGUE ("B3", t, ecount, arg);
    }
  else if ((code & 0x07) == 0)
    {
      label = unw_decode_uleb128 (&dp);
      if ((code & 0x08) != 0)
	UNW_DEC_COPY_STATE ("B4", label, arg);
      else
	UNW_DEC_LABEL_STATE ("B4", label, arg);
    }
  else
    switch (code & 0x7)
      {
      case 1:
	return unw_decode_x1 (dp, code, arg);
      case 2:
	return unw_decode_x2 (dp, code, arg);
      case 3:
	return unw_decode_x3 (dp, code, arg);
      case 4:
	return unw_decode_x4 (dp, code, arg);
      default:
	UNW_DEC_BAD_CODE (code);
	break;
      }
  return dp;
}

typedef const unsigned char *(*unw_decoder)
     PARAMS ((const unsigned char *, unsigned char, void *));

static unw_decoder unw_decode_table[2][8] =
  {
    /* prologue table: */
    {
      unw_decode_r1,		/* 0 */
      unw_decode_r1,
      unw_decode_r2,
      unw_decode_r3,
      unw_decode_p1,		/* 4 */
      unw_decode_p2_p5,
      unw_decode_p6,
      unw_decode_p7_p10
    },
    {
      unw_decode_r1,		/* 0 */
      unw_decode_r1,
      unw_decode_r2,
      unw_decode_r3,
      unw_decode_b1,		/* 4 */
      unw_decode_b1,
      unw_decode_b2,
      unw_decode_b3_x4
    }
  };

/* Decode one descriptor and return address of next descriptor.  */
const unsigned char *
unw_decode (dp, inside_body, ptr_inside_body)
     const unsigned char * dp;
     int                   inside_body;
     void *                ptr_inside_body;
{
  unw_decoder decoder;
  unsigned char code;

  code = *dp++;
  decoder = unw_decode_table[inside_body][code >> 5];
  return (*decoder) (dp, code, ptr_inside_body);
}