summaryrefslogtreecommitdiff
path: root/gdb/mcore-tdep.c
blob: 1715babd19fb736c9b78d604aebbb1eedc1ce46f (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
/* Target-machine dependent code for Motorola MCore for GDB, the GNU debugger
   Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.

   This file is part of GDB.

   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 "defs.h"
#include "frame.h"
#include "symtab.h"
#include "value.h"
#include "gdbcmd.h"
#include "regcache.h"
#include "symfile.h"
#include "gdbcore.h"
#include "inferior.h"
#include "arch-utils.h"
#include "gdb_string.h"

/* Functions declared and used only in this file */

static CORE_ADDR mcore_analyze_prologue (struct frame_info *fi, CORE_ADDR pc, int skip_prologue);

static struct frame_info *analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame);

static int get_insn (CORE_ADDR pc);

/* Functions exported from this file */

int mcore_use_struct_convention (int gcc_p, struct type *type);

void _initialize_mcore (void);

void mcore_init_extra_frame_info (int fromleaf, struct frame_info *fi);

CORE_ADDR mcore_frame_saved_pc (struct frame_info *fi);

CORE_ADDR mcore_find_callers_reg (struct frame_info *fi, int regnum);

CORE_ADDR mcore_frame_args_address (struct frame_info *fi);

CORE_ADDR mcore_frame_locals_address (struct frame_info *fi);

CORE_ADDR mcore_push_return_address (CORE_ADDR pc, CORE_ADDR sp);

CORE_ADDR mcore_push_arguments (int nargs, struct value ** args, CORE_ADDR sp,
			int struct_return, CORE_ADDR struct_addr);

void mcore_pop_frame ();

CORE_ADDR mcore_skip_prologue (CORE_ADDR pc);

CORE_ADDR mcore_frame_chain (struct frame_info *fi);

const unsigned char *mcore_breakpoint_from_pc (CORE_ADDR * bp_addr, int *bp_size);

int mcore_use_struct_convention (int gcc_p, struct type *type);

void mcore_store_return_value (struct type *type, char *valbuf);

CORE_ADDR mcore_extract_struct_value_address (char *regbuf);

void mcore_extract_return_value (struct type *type, char *regbuf, char *valbuf);

#ifdef MCORE_DEBUG
int mcore_debug = 0;
#endif


/* All registers are 4 bytes long.  */
#define MCORE_REG_SIZE 4
#define MCORE_NUM_REGS 65

/* Some useful register numbers.  */
#define PR_REGNUM 15
#define FIRST_ARGREG 2
#define LAST_ARGREG 7
#define RETVAL_REGNUM 2

  
/* Additional info that we use for managing frames */
struct frame_extra_info
  {
    /* A generic status word */
    int status;

    /* Size of this frame */
    int framesize;

    /* The register that is acting as a frame pointer, if
       it is being used.  This is undefined if status
       does not contain the flag MY_FRAME_IN_FP. */
    int fp_regnum;
  };

/* frame_extra_info status flags */

/* The base of the current frame is actually in the stack pointer.
   This happens when there is no frame pointer (MCore ABI does not
   require a frame pointer) or when we're stopped in the prologue or
   epilogue itself.  In these cases, mcore_analyze_prologue will need
   to update fi->frame before returning or analyzing the register
   save instructions. */
#define MY_FRAME_IN_SP 0x1

/* The base of the current frame is in a frame pointer register.
   This register is noted in frame_extra_info->fp_regnum.

   Note that the existence of an FP might also indicate that the
   function has called alloca. */
#define MY_FRAME_IN_FP 0x2

/* This flag is set to indicate that this frame is the top-most
   frame. This tells frame chain not to bother trying to unwind
   beyond this frame. */
#define NO_MORE_FRAMES 0x4

/* Instruction macros used for analyzing the prologue */
#define IS_SUBI0(x)   (((x) & 0xfe0f) == 0x2400)	/* subi r0,oimm5    */
#define IS_STM(x)     (((x) & 0xfff0) == 0x0070)	/* stm rf-r15,r0    */
#define IS_STWx0(x)   (((x) & 0xf00f) == 0x9000)	/* stw rz,(r0,disp) */
#define IS_STWxy(x)   (((x) & 0xf000) == 0x9000)	/* stw rx,(ry,disp) */
#define IS_MOVx0(x)   (((x) & 0xfff0) == 0x1200)	/* mov rn,r0        */
#define IS_LRW1(x)    (((x) & 0xff00) == 0x7100)	/* lrw r1,literal   */
#define IS_MOVI1(x)   (((x) & 0xf80f) == 0x6001)	/* movi r1,imm7     */
#define IS_BGENI1(x)  (((x) & 0xfe0f) == 0x3201)	/* bgeni r1,imm5    */
#define IS_BMASKI1(x) (((x) & 0xfe0f) == 0x2C01)	/* bmaski r1,imm5   */
#define IS_ADDI1(x)   (((x) & 0xfe0f) == 0x2001)	/* addi r1,oimm5    */
#define IS_SUBI1(x)   (((x) & 0xfe0f) == 0x2401)	/* subi r1,oimm5    */
#define IS_RSUBI1(x)  (((x) & 0xfe0f) == 0x2801)	/* rsubi r1,imm5    */
#define IS_NOT1(x)    (((x) & 0xffff) == 0x01f1)	/* not r1           */
#define IS_ROTLI1(x)  (((x) & 0xfe0f) == 0x3801)	/* rotli r1,imm5    */
#define IS_BSETI1(x)  (((x) & 0xfe0f) == 0x3401)	/* bseti r1,imm5    */
#define IS_BCLRI1(x)  (((x) & 0xfe0f) == 0x3001)	/* bclri r1,imm5    */
#define IS_IXH1(x)    (((x) & 0xffff) == 0x1d11)	/* ixh r1,r1        */
#define IS_IXW1(x)    (((x) & 0xffff) == 0x1511)	/* ixw r1,r1        */
#define IS_SUB01(x)   (((x) & 0xffff) == 0x0510)	/* subu r0,r1       */
#define IS_RTS(x)     (((x) & 0xffff) == 0x00cf)	/* jmp r15          */

#define IS_R1_ADJUSTER(x) \
    (IS_ADDI1(x) || IS_SUBI1(x) || IS_ROTLI1(x) || IS_BSETI1(x) \
     || IS_BCLRI1(x) || IS_RSUBI1(x) || IS_NOT1(x) \
     || IS_IXH1(x) || IS_IXW1(x))


#ifdef MCORE_DEBUG
static void
mcore_dump_insn (char *commnt, CORE_ADDR pc, int insn)
{
  if (mcore_debug)
    {
      printf_filtered ("MCORE:  %s %08x %08x ",
		       commnt, (unsigned int) pc, (unsigned int) insn);
      TARGET_PRINT_INSN (pc, &tm_print_insn_info);
      printf_filtered ("\n");
    }
}
#define mcore_insn_debug(args) { if (mcore_debug) printf_filtered args; }
#else /* !MCORE_DEBUG */
#define mcore_dump_insn(a,b,c) {}
#define mcore_insn_debug(args) {}
#endif


static struct type *
mcore_register_virtual_type (int regnum)
{
  if (regnum < 0 || regnum >= MCORE_NUM_REGS)
    internal_error (__FILE__, __LINE__,
		    "mcore_register_virtual_type: illegal register number %d",
		    regnum);
  else
    return builtin_type_int;
}

static int
mcore_register_byte (int regnum)
{
  if (regnum < 0 || regnum >= MCORE_NUM_REGS)
    internal_error (__FILE__, __LINE__,
		    "mcore_register_byte: illegal register number %d",
		    regnum);
  else 
    return (regnum * MCORE_REG_SIZE);
}

static int
mcore_register_size (int regnum)
{
  
  if (regnum < 0 || regnum >= MCORE_NUM_REGS)
    internal_error (__FILE__, __LINE__,
		    "mcore_register_size: illegal register number %d",
		    regnum);
  else
    return MCORE_REG_SIZE;
}

/* The registers of the Motorola MCore processors */

static const char *
mcore_register_name (int regnum)
{

  static char *register_names[] = { 
    "r0",   "r1",  "r2",    "r3",   "r4",   "r5",   "r6",   "r7",
    "r8",   "r9",  "r10",   "r11",  "r12",  "r13",  "r14",  "r15",
    "ar0",  "ar1", "ar2",   "ar3",  "ar4",  "ar5",  "ar6",  "ar7",
    "ar8",  "ar9", "ar10", "ar11",  "ar12", "ar13", "ar14", "ar15",
    "psr",  "vbr", "epsr",  "fpsr", "epc",  "fpc",  "ss0",  "ss1",
    "ss2",  "ss3", "ss4",   "gcr",  "gsr",  "cr13", "cr14", "cr15",
    "cr16", "cr17", "cr18", "cr19", "cr20", "cr21", "cr22", "cr23",
    "cr24", "cr25", "cr26", "cr27", "cr28", "cr29", "cr30", "cr31",
    "pc" 
  };

  if (regnum < 0 ||
      regnum >= sizeof (register_names) / sizeof (register_names[0]))
    internal_error (__FILE__, __LINE__,
		    "mcore_register_name: illegal register number %d",
		    regnum);
  else
    return register_names[regnum];
}

/* Given the address at which to insert a breakpoint (BP_ADDR),
   what will that breakpoint be?

   For MCore, we have a breakpoint instruction. Since all MCore
   instructions are 16 bits, this is all we need, regardless of
   address. bpkt = 0x0000 */

const unsigned char *
mcore_breakpoint_from_pc (CORE_ADDR * bp_addr, int *bp_size)
{
  static char breakpoint[] =
  {0x00, 0x00};
  *bp_size = 2;
  return breakpoint;
}

static CORE_ADDR
mcore_saved_pc_after_call (struct frame_info *frame)
{
  return read_register (PR_REGNUM);
}

/* This is currently handled by init_extra_frame_info.  */
static void
mcore_frame_init_saved_regs (struct frame_info *frame)
{

}

/* This is currently handled by mcore_push_arguments  */
static void
mcore_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
{

}

static int
mcore_reg_struct_has_addr (int gcc_p, struct type *type)
{
  return 0;
}


/* Helper function for several routines below.  This funtion simply
   sets up a fake, aka dummy, frame (not a _call_ dummy frame) that
   we can analyze with mcore_analyze_prologue. */

static struct frame_info *
analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame)
{
  static struct frame_info *dummy = NULL;

  if (dummy == NULL)
    {
      struct frame_extra_info *extra_info;
      CORE_ADDR *saved_regs;
      dummy = deprecated_frame_xmalloc ();
      saved_regs = (CORE_ADDR *) xmalloc (SIZEOF_FRAME_SAVED_REGS);
      deprecated_set_frame_saved_regs_hack (dummy, saved_regs);
      extra_info = XMALLOC (struct frame_extra_info);
      deprecated_set_frame_extra_info_hack (dummy, extra_info);
    }

  deprecated_set_frame_next_hack (dummy, NULL);
  deprecated_set_frame_prev_hack (dummy, NULL);
  deprecated_update_frame_pc_hack (dummy, pc);
  deprecated_update_frame_base_hack (dummy, frame);
  get_frame_extra_info (dummy)->status = 0;
  get_frame_extra_info (dummy)->framesize = 0;
  memset (get_frame_saved_regs (dummy), '\000', SIZEOF_FRAME_SAVED_REGS);
  mcore_analyze_prologue (dummy, 0, 0);
  return dummy;
}

/* Function prologues on the Motorola MCore processors consist of:

   - adjustments to the stack pointer (r1 used as scratch register)
   - store word/multiples that use r0 as the base address
   - making a copy of r0 into another register (a "frame" pointer)

   Note that the MCore really doesn't have a real frame pointer.
   Instead, the compiler may copy the SP into a register (usually
   r8) to act as an arg pointer.  For our target-dependent purposes,
   the frame info's "frame" member will be the beginning of the
   frame. The SP could, in fact, point below this.

   The prologue ends when an instruction fails to meet either of
   the first two criteria or when an FP is made.  We make a special
   exception for gcc. When compiling unoptimized code, gcc will
   setup stack slots. We need to make sure that we skip the filling
   of these stack slots as much as possible. This is only done
   when SKIP_PROLOGUE is set, so that it does not mess up
   backtraces. */

/* Analyze the prologue of frame FI to determine where registers are saved,
   the end of the prologue, etc. Return the address of the first line
   of "real" code (i.e., the end of the prologue). */

static CORE_ADDR
mcore_analyze_prologue (struct frame_info *fi, CORE_ADDR pc, int skip_prologue)
{
  CORE_ADDR func_addr, func_end, addr, stop;
  CORE_ADDR stack_size;
  int insn, rn;
  int status;
  int fp_regnum = 0; /* dummy, valid when (flags & MY_FRAME_IN_FP) */
  int flags;
  int framesize;
  int register_offsets[NUM_REGS];
  char *name;

  /* If provided, use the PC in the frame to look up the
     start of this function. */
  pc = (fi == NULL ? pc : get_frame_pc (fi));

  /* Find the start of this function. */
  status = find_pc_partial_function (pc, &name, &func_addr, &func_end);

  /* If the start of this function could not be found or if the debbuger
     is stopped at the first instruction of the prologue, do nothing. */
  if (status == 0)
    return pc;

  /* If the debugger is entry function, give up. */
  if (func_addr == entry_point_address ())
    {
      if (fi != NULL)
	get_frame_extra_info (fi)->status |= NO_MORE_FRAMES;
      return pc;
    }

  /* At the start of a function, our frame is in the stack pointer. */
  flags = MY_FRAME_IN_SP;

  /* Start decoding the prologue.  We start by checking two special cases:

     1. We're about to return
     2. We're at the first insn of the prologue.

     If we're about to return, our frame has already been deallocated.
     If we are stopped at the first instruction of a prologue,
     then our frame has not yet been set up. */

  /* Get the first insn from memory (all MCore instructions are 16 bits) */
  mcore_insn_debug (("MCORE: starting prologue decoding\n"));
  insn = get_insn (pc);
  mcore_dump_insn ("got 1: ", pc, insn);

  /* Check for return. */
  if (fi != NULL && IS_RTS (insn))
    {
      mcore_insn_debug (("MCORE: got jmp r15"));
      if (get_next_frame (fi) == NULL)
	deprecated_update_frame_base_hack (fi, read_sp ());
      return get_frame_pc (fi);
    }

  /* Check for first insn of prologue */
  if (fi != NULL && get_frame_pc (fi) == func_addr)
    {
      if (get_next_frame (fi) == NULL)
	deprecated_update_frame_base_hack (fi, read_sp ());
      return get_frame_pc (fi);
    }

  /* Figure out where to stop scanning */
  stop = (fi ? get_frame_pc (fi) : func_end);

  /* Don't walk off the end of the function */
  stop = (stop > func_end ? func_end : stop);

  /* REGISTER_OFFSETS will contain offsets, from the top of the frame
     (NOT the frame pointer), for the various saved registers or -1
     if the register is not saved. */
  for (rn = 0; rn < NUM_REGS; rn++)
    register_offsets[rn] = -1;

  /* Analyze the prologue. Things we determine from analyzing the
     prologue include:
     * the size of the frame
     * where saved registers are located (and which are saved)
     * FP used? */
  mcore_insn_debug (("MCORE: Scanning prologue: func_addr=0x%x, stop=0x%x\n",
		     (unsigned int) func_addr, (unsigned int) stop));

  framesize = 0;
  for (addr = func_addr; addr < stop; addr += 2)
    {
      /* Get next insn */
      insn = get_insn (addr);
      mcore_dump_insn ("got 2: ", addr, insn);

      if (IS_SUBI0 (insn))
	{
	  int offset = 1 + ((insn >> 4) & 0x1f);
	  mcore_insn_debug (("MCORE: got subi r0,%d; continuing\n", offset));
	  framesize += offset;
	  continue;
	}
      else if (IS_STM (insn))
	{
	  /* Spill register(s) */
	  int offset;
	  int start_register;

	  /* BIG WARNING! The MCore ABI does not restrict functions
	     to taking only one stack allocation. Therefore, when
	     we save a register, we record the offset of where it was
	     saved relative to the current framesize. This will
	     then give an offset from the SP upon entry to our
	     function. Remember, framesize is NOT constant until
	     we're done scanning the prologue. */
	  start_register = (insn & 0xf);
	  mcore_insn_debug (("MCORE: got stm r%d-r15,(r0)\n", start_register));

	  for (rn = start_register, offset = 0; rn <= 15; rn++, offset += 4)
	    {
	      register_offsets[rn] = framesize - offset;
	      mcore_insn_debug (("MCORE: r%d saved at 0x%x (offset %d)\n", rn,
				 register_offsets[rn], offset));
	    }
	  mcore_insn_debug (("MCORE: continuing\n"));
	  continue;
	}
      else if (IS_STWx0 (insn))
	{
	  /* Spill register: see note for IS_STM above. */
	  int imm;

	  rn = (insn >> 8) & 0xf;
	  imm = (insn >> 4) & 0xf;
	  register_offsets[rn] = framesize - (imm << 2);
	  mcore_insn_debug (("MCORE: r%d saved at offset 0x%x\n", rn, register_offsets[rn]));
	  mcore_insn_debug (("MCORE: continuing\n"));
	  continue;
	}
      else if (IS_MOVx0 (insn))
	{
	  /* We have a frame pointer, so this prologue is over.  Note
	     the register which is acting as the frame pointer. */
	  flags |= MY_FRAME_IN_FP;
	  flags &= ~MY_FRAME_IN_SP;
	  fp_regnum = insn & 0xf;
	  mcore_insn_debug (("MCORE: Found a frame pointer: r%d\n", fp_regnum));

	  /* If we found an FP, we're at the end of the prologue. */
	  mcore_insn_debug (("MCORE: end of prologue\n"));
	  if (skip_prologue)
	    continue;

	  /* If we're decoding prologue, stop here. */
	  addr += 2;
	  break;
	}
      else if (IS_STWxy (insn) && (flags & MY_FRAME_IN_FP) && ((insn & 0xf) == fp_regnum))
	{
	  /* Special case. Skip over stack slot allocs, too. */
	  mcore_insn_debug (("MCORE: push arg onto stack.\n"));
	  continue;
	}
      else if (IS_LRW1 (insn) || IS_MOVI1 (insn)
	       || IS_BGENI1 (insn) || IS_BMASKI1 (insn))
	{
	  int adjust = 0;
	  int offset = 0;
	  int insn2;

	  mcore_insn_debug (("MCORE: looking at large frame\n"));
	  if (IS_LRW1 (insn))
	    {
	      adjust =
		read_memory_integer ((addr + 2 + ((insn & 0xff) << 2)) & 0xfffffffc, 4);
	    }
	  else if (IS_MOVI1 (insn))
	    adjust = (insn >> 4) & 0x7f;
	  else if (IS_BGENI1 (insn))
	    adjust = 1 << ((insn >> 4) & 0x1f);
	  else			/* IS_BMASKI (insn) */
	    adjust = (1 << (adjust >> 4) & 0x1f) - 1;

	  mcore_insn_debug (("MCORE: base framesize=0x%x\n", adjust));

	  /* May have zero or more insns which modify r1 */
	  mcore_insn_debug (("MCORE: looking for r1 adjusters...\n"));
	  offset = 2;
	  insn2 = get_insn (addr + offset);
	  while (IS_R1_ADJUSTER (insn2))
	    {
	      int imm;

	      imm = (insn2 >> 4) & 0x1f;
	      mcore_dump_insn ("got 3: ", addr + offset, insn);
	      if (IS_ADDI1 (insn2))
		{
		  adjust += (imm + 1);
		  mcore_insn_debug (("MCORE: addi r1,%d\n", imm + 1));
		}
	      else if (IS_SUBI1 (insn2))
		{
		  adjust -= (imm + 1);
		  mcore_insn_debug (("MCORE: subi r1,%d\n", imm + 1));
		}
	      else if (IS_RSUBI1 (insn2))
		{
		  adjust = imm - adjust;
		  mcore_insn_debug (("MCORE: rsubi r1,%d\n", imm + 1));
		}
	      else if (IS_NOT1 (insn2))
		{
		  adjust = ~adjust;
		  mcore_insn_debug (("MCORE: not r1\n"));
		}
	      else if (IS_ROTLI1 (insn2))
		{
		  adjust <<= imm;
		  mcore_insn_debug (("MCORE: rotli r1,%d\n", imm + 1));
		}
	      else if (IS_BSETI1 (insn2))
		{
		  adjust |= (1 << imm);
		  mcore_insn_debug (("MCORE: bseti r1,%d\n", imm));
		}
	      else if (IS_BCLRI1 (insn2))
		{
		  adjust &= ~(1 << imm);
		  mcore_insn_debug (("MCORE: bclri r1,%d\n", imm));
		}
	      else if (IS_IXH1 (insn2))
		{
		  adjust *= 3;
		  mcore_insn_debug (("MCORE: ix.h r1,r1\n"));
		}
	      else if (IS_IXW1 (insn2))
		{
		  adjust *= 5;
		  mcore_insn_debug (("MCORE: ix.w r1,r1\n"));
		}

	      offset += 2;
	      insn2 = get_insn (addr + offset);
	    };

	  mcore_insn_debug (("MCORE: done looking for r1 adjusters\n"));

	  /* If the next insn adjusts the stack pointer, we keep everything;
	     if not, we scrap it and we've found the end of the prologue. */
	  if (IS_SUB01 (insn2))
	    {
	      addr += offset;
	      framesize += adjust;
	      mcore_insn_debug (("MCORE: found stack adjustment of 0x%x bytes.\n", adjust));
	      mcore_insn_debug (("MCORE: skipping to new address 0x%x\n", addr));
	      mcore_insn_debug (("MCORE: continuing\n"));
	      continue;
	    }

	  /* None of these instructions are prologue, so don't touch
	     anything. */
	  mcore_insn_debug (("MCORE: no subu r1,r0, NOT altering framesize.\n"));
	  break;
	}

      /* This is not a prologue insn, so stop here. */
      mcore_insn_debug (("MCORE: insn is not a prologue insn -- ending scan\n"));
      break;
    }

  mcore_insn_debug (("MCORE: done analyzing prologue\n"));
  mcore_insn_debug (("MCORE: prologue end = 0x%x\n", addr));

  /* Save everything we have learned about this frame into FI. */
  if (fi != NULL)
    {
      get_frame_extra_info (fi)->framesize = framesize;
      get_frame_extra_info (fi)->fp_regnum = fp_regnum;
      get_frame_extra_info (fi)->status = flags;

      /* Fix the frame pointer. When gcc uses r8 as a frame pointer,
         it is really an arg ptr. We adjust fi->frame to be a "real"
         frame pointer. */
      if (get_next_frame (fi) == NULL)
	{
	  if (get_frame_extra_info (fi)->status & MY_FRAME_IN_SP)
	    deprecated_update_frame_base_hack (fi, read_sp () + framesize);
	  else
	    deprecated_update_frame_base_hack (fi, read_register (fp_regnum) + framesize);
	}

      /* Note where saved registers are stored. The offsets in REGISTER_OFFSETS
         are computed relative to the top of the frame. */
      for (rn = 0; rn < NUM_REGS; rn++)
	{
	  if (register_offsets[rn] >= 0)
	    {
	      get_frame_saved_regs (fi)[rn] = get_frame_base (fi) - register_offsets[rn];
	      mcore_insn_debug (("Saved register %s stored at 0x%08x, value=0x%08x\n",
			       mcore_register_names[rn], fi->saved_regs[rn],
			      read_memory_integer (fi->saved_regs[rn], 4)));
	    }
	}
    }

  /* Return addr of first non-prologue insn. */
  return addr;
}

/* Given a GDB frame, determine the address of the calling function's
   frame.  This will be used to create a new GDB frame struct, and
   then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
   will be called for the new frame. */

CORE_ADDR
mcore_frame_chain (struct frame_info * fi)
{
  struct frame_info *dummy;
  CORE_ADDR callers_addr;

  /* Analyze the prologue of this function. */
  if (get_frame_extra_info (fi)->status == 0)
    mcore_analyze_prologue (fi, 0, 0);

  /* If mcore_analyze_prologue set NO_MORE_FRAMES, quit now. */
  if (get_frame_extra_info (fi)->status & NO_MORE_FRAMES)
    return 0;

  /* Now that we've analyzed our prologue, we can start to ask
     for information about our caller. The easiest way to do
     this is to analyze our caller's prologue. 

     If our caller has a frame pointer, then we need to find
     the value of that register upon entry to our frame.
     This value is either in fi->saved_regs[rn] if it's saved,
     or it's still in a register.

     If our caller does not have a frame pointer, then his frame base
     is <our base> + -<caller's frame size>. */
  dummy = analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi), get_frame_base (fi));

  if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_FP)
    {
      int fp = get_frame_extra_info (dummy)->fp_regnum;

      /* Our caller has a frame pointer. */
      if (get_frame_saved_regs (fi)[fp] != 0)
	{
	  /* The "FP" was saved on the stack.  Don't forget to adjust
	     the "FP" with the framesize to get a real FP. */
	  callers_addr = read_memory_integer (get_frame_saved_regs (fi)[fp], REGISTER_SIZE)
	    + get_frame_extra_info (dummy)->framesize;
	}
      else
	{
	  /* It's still in the register.  Don't forget to adjust
	     the "FP" with the framesize to get a real FP. */
	  callers_addr = read_register (fp) + get_frame_extra_info (dummy)->framesize;
	}
    }
  else
    {
      /* Our caller does not have a frame pointer. */
      callers_addr = get_frame_base (fi) + get_frame_extra_info (dummy)->framesize;
    }

  return callers_addr;
}

/* Skip the prologue of the function at PC. */

CORE_ADDR
mcore_skip_prologue (CORE_ADDR pc)
{
  CORE_ADDR func_addr, func_end;
  struct symtab_and_line sal;

  /* If we have line debugging information, then the end of the
     prologue should be the first assembly instruction of the first
     source line */
  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
    {
      sal = find_pc_line (func_addr, 0);
      if (sal.end && sal.end < func_end)
	return sal.end;
    }

  return mcore_analyze_prologue (NULL, pc, 1);
}

/* Return the address at which function arguments are offset. */
CORE_ADDR
mcore_frame_args_address (struct frame_info * fi)
{
  return get_frame_base (fi) - get_frame_extra_info (fi)->framesize;
}

CORE_ADDR
mcore_frame_locals_address (struct frame_info * fi)
{
  return get_frame_base (fi) - get_frame_extra_info (fi)->framesize;
}

/* Return the frame pointer in use at address PC. */

void
mcore_virtual_frame_pointer (CORE_ADDR pc, int *reg, LONGEST *offset)
{
  struct frame_info *dummy = analyze_dummy_frame (pc, 0);
  if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_SP)
    {
      *reg = SP_REGNUM;
      *offset = 0;
    }
  else
    {
      *reg = get_frame_extra_info (dummy)->fp_regnum;
      *offset = 0;
    }
}

/* Find the value of register REGNUM in frame FI. */

CORE_ADDR
mcore_find_callers_reg (struct frame_info *fi, int regnum)
{
  for (; fi != NULL; fi = get_next_frame (fi))
    {
      if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi),
				       get_frame_base (fi)))
	return deprecated_read_register_dummy (get_frame_pc (fi),
					       get_frame_base (fi), regnum);
      else if (get_frame_saved_regs (fi)[regnum] != 0)
	return read_memory_integer (get_frame_saved_regs (fi)[regnum],
				    REGISTER_SIZE);
    }

  return read_register (regnum);
}

/* Find the saved pc in frame FI. */

CORE_ADDR
mcore_frame_saved_pc (struct frame_info * fi)
{

  if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi),
				   get_frame_base (fi)))
    return deprecated_read_register_dummy (get_frame_pc (fi),
					   get_frame_base (fi), PC_REGNUM);
  else
    return mcore_find_callers_reg (fi, PR_REGNUM);
}

/* INFERIOR FUNCTION CALLS */

/* This routine gets called when either the user uses the "return"
   command, or the call dummy breakpoint gets hit. */

void
mcore_pop_frame (void)
{
  int rn;
  struct frame_info *fi = get_current_frame ();

  if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi),
				   get_frame_base (fi)))
    generic_pop_dummy_frame ();
  else
    {
      /* Write out the PC we saved. */
      write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (fi));

      /* Restore any saved registers. */
      for (rn = 0; rn < NUM_REGS; rn++)
	{
	  if (get_frame_saved_regs (fi)[rn] != 0)
	    {
	      ULONGEST value;

	      value = read_memory_unsigned_integer (get_frame_saved_regs (fi)[rn],
						    REGISTER_SIZE);
	      write_register (rn, value);
	    }
	}

      /* Actually cut back the stack. */
      write_register (SP_REGNUM, get_frame_base (fi));
    }

  /* Finally, throw away any cached frame information. */
  flush_cached_frames ();
}

/* Setup arguments and PR for a call to the target. First six arguments
   go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on to the stack.

   * Types with lengths greater than REGISTER_SIZE may not be split
   between registers and the stack, and they must start in an even-numbered
   register. Subsequent args will go onto the stack.

   * Structs may be split between registers and stack, left-aligned.

   * If the function returns a struct which will not fit into registers (it's
   more than eight bytes), we must allocate for that, too. Gdb will tell
   us where this buffer is (STRUCT_ADDR), and we simply place it into
   FIRST_ARGREG, since the MCORE treats struct returns (of less than eight
   bytes) as hidden first arguments. */

CORE_ADDR
mcore_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
		      int struct_return, CORE_ADDR struct_addr)
{
  int argreg;
  int argnum;
  struct stack_arg
    {
      int len;
      char *val;
    }
   *stack_args;
  int nstack_args = 0;

  stack_args = (struct stack_arg *) alloca (nargs * sizeof (struct stack_arg));

  argreg = FIRST_ARGREG;

  /* Align the stack. This is mostly a nop, but not always. It will be needed
     if we call a function which has argument overflow. */
  sp &= ~3;

  /* If this function returns a struct which does not fit in the
     return registers, we must pass a buffer to the function
     which it can use to save the return value. */
  if (struct_return)
    write_register (argreg++, struct_addr);

  /* FIXME: what about unions? */
  for (argnum = 0; argnum < nargs; argnum++)
    {
      char *val = (char *) VALUE_CONTENTS (args[argnum]);
      int len = TYPE_LENGTH (VALUE_TYPE (args[argnum]));
      struct type *type = VALUE_TYPE (args[argnum]);
      int olen;

      mcore_insn_debug (("MCORE PUSH: argreg=%d; len=%d; %s\n",
			 argreg, len, TYPE_CODE (type) == TYPE_CODE_STRUCT ? "struct" : "not struct"));
      /* Arguments larger than a register must start in an even
         numbered register. */
      olen = len;

      if (TYPE_CODE (type) != TYPE_CODE_STRUCT && len > REGISTER_SIZE && argreg % 2)
	{
	  mcore_insn_debug (("MCORE PUSH: %d > REGISTER_SIZE: and %s is not even\n",
			     len, mcore_register_names[argreg]));
	  argreg++;
	}

      if ((argreg <= LAST_ARGREG && len <= (LAST_ARGREG - argreg + 1) * REGISTER_SIZE)
	  || (TYPE_CODE (type) == TYPE_CODE_STRUCT))
	{
	  /* Something that will fit entirely into registers (or a struct
	     which may be split between registers and stack). */
	  mcore_insn_debug (("MCORE PUSH: arg %d going into regs\n", argnum));

	  if (TYPE_CODE (type) == TYPE_CODE_STRUCT && olen < REGISTER_SIZE)
	    {
	      /* Small structs must be right aligned within the register,
	         the most significant bits are undefined. */
	      write_register (argreg, extract_unsigned_integer (val, len));
	      argreg++;
	      len = 0;
	    }

	  while (len > 0 && argreg <= LAST_ARGREG)
	    {
	      write_register (argreg, extract_unsigned_integer (val, REGISTER_SIZE));
	      argreg++;
	      val += REGISTER_SIZE;
	      len -= REGISTER_SIZE;
	    }

	  /* Any remainder for the stack is noted below... */
	}
      else if (TYPE_CODE (VALUE_TYPE (args[argnum])) != TYPE_CODE_STRUCT
	       && len > REGISTER_SIZE)
	{
	  /* All subsequent args go onto the stack. */
	  mcore_insn_debug (("MCORE PUSH: does not fit into regs, going onto stack\n"));
	  argnum = LAST_ARGREG + 1;
	}

      if (len > 0)
	{
	  /* Note that this must be saved onto the stack */
	  mcore_insn_debug (("MCORE PUSH: adding arg %d to stack\n", argnum));
	  stack_args[nstack_args].val = val;
	  stack_args[nstack_args].len = len;
	  nstack_args++;
	}

    }

  /* We're done with registers and stack allocation. Now do the actual
     stack pushes. */
  while (nstack_args--)
    {
      sp -= stack_args[nstack_args].len;
      write_memory (sp, stack_args[nstack_args].val, stack_args[nstack_args].len);
    }

  /* Return adjusted stack pointer.  */
  return sp;
}

/* Store the return address for the call dummy. For MCore, we've
   opted to use generic call dummies, so we simply store the
   CALL_DUMMY_ADDRESS into the PR register (r15). */

CORE_ADDR
mcore_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
{
  write_register (PR_REGNUM, CALL_DUMMY_ADDRESS ());
  return sp;
}

/* Setting/getting return values from functions.

   The Motorola MCore processors use r2/r3 to return anything
   not larger than 32 bits. Everything else goes into a caller-
   supplied buffer, which is passed in via a hidden first
   argument.

   For gdb, this leaves us two routes, based on what
   USE_STRUCT_CONVENTION (mcore_use_struct_convention) returns.
   If this macro returns 1, gdb will call STORE_STRUCT_RETURN and
   EXTRACT_STRUCT_VALUE_ADDRESS.

   If USE_STRUCT_CONVENTION retruns 0, then gdb uses STORE_RETURN_VALUE
   and EXTRACT_RETURN_VALUE to store/fetch the functions return value. */

/* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of
   EXTRACT_RETURN_VALUE?  GCC_P is true if compiled with gcc
   and TYPE is the type (which is known to be struct, union or array). */

int
mcore_use_struct_convention (int gcc_p, struct type *type)
{
  return (TYPE_LENGTH (type) > 8);
}

/* Where is the return value saved? For MCore, a pointer to 
   this buffer was passed as a hidden first argument, so
   just return that address. */

CORE_ADDR
mcore_extract_struct_value_address (char *regbuf)
{
  return extract_address (regbuf + REGISTER_BYTE (FIRST_ARGREG), REGISTER_SIZE);
}

/* Given a function which returns a value of type TYPE, extract the
   the function's return value and place the result into VALBUF.
   REGBUF is the register contents of the target. */

void
mcore_extract_return_value (struct type *type, char *regbuf, char *valbuf)
{
  /* Copy the return value (starting) in RETVAL_REGNUM to VALBUF. */
  /* Only getting the first byte! if len = 1, we need the last byte of
     the register, not the first. */
  memcpy (valbuf, regbuf + REGISTER_BYTE (RETVAL_REGNUM) +
  (TYPE_LENGTH (type) < 4 ? 4 - TYPE_LENGTH (type) : 0), TYPE_LENGTH (type));
}

/* Store the return value in VALBUF (of type TYPE) where the caller
   expects to see it.

   Values less than 32 bits are stored in r2, right justified and
   sign or zero extended.

   Values between 32 and 64 bits are stored in r2 (most
   significant word) and r3 (least significant word, left justified).
   Note that this includes structures of less than eight bytes, too. */

void
mcore_store_return_value (struct type *type, char *valbuf)
{
  int value_size;
  int return_size;
  int offset;
  char *zeros;

  value_size = TYPE_LENGTH (type);

  /* Return value fits into registers. */
  return_size = (value_size + REGISTER_SIZE - 1) & ~(REGISTER_SIZE - 1);
  offset = REGISTER_BYTE (RETVAL_REGNUM) + (return_size - value_size);
  zeros = alloca (return_size);
  memset (zeros, 0, return_size);

  deprecated_write_register_bytes (REGISTER_BYTE (RETVAL_REGNUM), zeros,
				   return_size);
  deprecated_write_register_bytes (offset, valbuf, value_size);
}

/* Initialize our target-dependent "stuff" for this newly created frame.

   This includes allocating space for saved registers and analyzing
   the prologue of this frame. */

void
mcore_init_extra_frame_info (int fromleaf, struct frame_info *fi)
{
  if (fi && get_next_frame (fi))
    deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi)));

  frame_saved_regs_zalloc (fi);

  frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
  get_frame_extra_info (fi)->status = 0;
  get_frame_extra_info (fi)->framesize = 0;

  if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi),
				   get_frame_base (fi)))
    {
      /* We need to setup fi->frame here because run_stack_dummy gets it wrong
         by assuming it's always FP.  */
      deprecated_update_frame_base_hack (fi, deprecated_read_register_dummy (get_frame_pc (fi), get_frame_base (fi), SP_REGNUM));
    }
  else
    mcore_analyze_prologue (fi, 0, 0);
}

/* Get an insturction from memory. */

static int
get_insn (CORE_ADDR pc)
{
  char buf[4];
  int status = read_memory_nobpt (pc, buf, 2);
  if (status != 0)
    return 0;

  return extract_unsigned_integer (buf, 2);
}

static struct gdbarch *
mcore_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
  static LONGEST call_dummy_words[7] = { };
  struct gdbarch_tdep *tdep = NULL;
  struct gdbarch *gdbarch;

  /* find a candidate among the list of pre-declared architectures. */
  arches = gdbarch_list_lookup_by_info (arches, &info);
  if (arches != NULL)
    return (arches->gdbarch);

  gdbarch = gdbarch_alloc (&info, 0);

  /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
     ready to unwind the PC first (see frame.c:get_prev_frame()).  */
  set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);

  /* Registers: */

  /* All registers are 32 bits */
  set_gdbarch_register_size (gdbarch, MCORE_REG_SIZE);
  set_gdbarch_deprecated_max_register_raw_size (gdbarch, MCORE_REG_SIZE);
  set_gdbarch_deprecated_max_register_virtual_size (gdbarch, MCORE_REG_SIZE);
  set_gdbarch_register_name (gdbarch, mcore_register_name);
  set_gdbarch_register_virtual_type (gdbarch, mcore_register_virtual_type);
  set_gdbarch_register_virtual_size (gdbarch, mcore_register_size);
  set_gdbarch_register_raw_size (gdbarch, mcore_register_size);
  set_gdbarch_register_byte (gdbarch, mcore_register_byte);
  set_gdbarch_register_bytes (gdbarch, MCORE_REG_SIZE * MCORE_NUM_REGS);
  set_gdbarch_num_regs (gdbarch, MCORE_NUM_REGS);
  set_gdbarch_pc_regnum (gdbarch, 64);
  set_gdbarch_sp_regnum (gdbarch, 0);
  set_gdbarch_fp_regnum (gdbarch, 0);

  /* Call Dummies:  */

  set_gdbarch_call_dummy_p (gdbarch, 1);
  set_gdbarch_call_dummy_words (gdbarch, call_dummy_words);
  set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
  set_gdbarch_call_dummy_start_offset (gdbarch, 0);
  set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
  set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
  set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
  set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
  set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
  set_gdbarch_saved_pc_after_call (gdbarch, mcore_saved_pc_after_call);
  set_gdbarch_function_start_offset (gdbarch, 0);
  set_gdbarch_decr_pc_after_break (gdbarch, 0);
  set_gdbarch_breakpoint_from_pc (gdbarch, mcore_breakpoint_from_pc);
  set_gdbarch_deprecated_push_return_address (gdbarch, mcore_push_return_address);
  set_gdbarch_deprecated_push_arguments (gdbarch, mcore_push_arguments);
  set_gdbarch_call_dummy_length (gdbarch, 0);

  /* Frames:  */

  set_gdbarch_deprecated_init_extra_frame_info (gdbarch, mcore_init_extra_frame_info);
  set_gdbarch_deprecated_frame_chain (gdbarch, mcore_frame_chain);
  set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mcore_frame_init_saved_regs);
  set_gdbarch_deprecated_frame_saved_pc (gdbarch, mcore_frame_saved_pc);
  set_gdbarch_deprecated_store_return_value (gdbarch, mcore_store_return_value);
  set_gdbarch_deprecated_extract_return_value (gdbarch, 
					       mcore_extract_return_value);
  set_gdbarch_deprecated_store_struct_return (gdbarch, mcore_store_struct_return);
  set_gdbarch_deprecated_extract_struct_value_address (gdbarch, 
						       mcore_extract_struct_value_address);
  set_gdbarch_skip_prologue (gdbarch, mcore_skip_prologue);
  set_gdbarch_frame_args_skip (gdbarch, 0);
  set_gdbarch_frame_args_address (gdbarch, mcore_frame_args_address);
  set_gdbarch_frame_locals_address (gdbarch, mcore_frame_locals_address);
  set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
  set_gdbarch_deprecated_pop_frame (gdbarch, mcore_pop_frame);
  set_gdbarch_virtual_frame_pointer (gdbarch, mcore_virtual_frame_pointer);

  /* Misc.:  */

  /* Stack grows down.  */
  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
  set_gdbarch_use_struct_convention (gdbarch, mcore_use_struct_convention);
  set_gdbarch_believe_pcc_promotion (gdbarch, 1);
  /* MCore will never pass a sturcture by reference. It will always be split
     between registers and stack.  */
  set_gdbarch_reg_struct_has_addr (gdbarch, mcore_reg_struct_has_addr);

  return gdbarch;
}

static void
mcore_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
{

}

void
_initialize_mcore_tdep (void)
{
  extern int print_insn_mcore (bfd_vma, disassemble_info *);
  gdbarch_register (bfd_arch_mcore, mcore_gdbarch_init, mcore_dump_tdep);
  tm_print_insn = print_insn_mcore;

#ifdef MCORE_DEBUG
  add_show_from_set (add_set_cmd ("mcoredebug", no_class,
				  var_boolean, (char *) &mcore_debug,
				  "Set mcore debugging.\n", &setlist),
		     &showlist);
#endif
}