aboutsummaryrefslogtreecommitdiff
path: root/gdb/m88k-tdep.c
blob: 2ac433526c7dd3880f15dbe0e3e85e2b9a912942 (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
/* Target-machine dependent code for Motorola 88000 series, for GDB.
   Copyright 1988, 1990, 1991, 1994, 1995 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 "inferior.h"
#include "value.h"
#include "gdbcore.h"
#include "symtab.h"
#include "setjmp.h"
#include "value.h"

/* Size of an instruction */
#define	BYTES_PER_88K_INSN	4

void frame_find_saved_regs ();

/* Is this target an m88110?  Otherwise assume m88100.  This has
   relevance for the ways in which we screw with instruction pointers.  */

int target_is_m88110 = 0;

/* The m88k kernel aligns all instructions on 4-byte boundaries.  The
   kernel also uses the least significant two bits for its own hocus
   pocus.  When gdb receives an address from the kernel, it needs to
   preserve those right-most two bits, but gdb also needs to be careful
   to realize that those two bits are not really a part of the address
   of an instruction.  Shrug.  */

CORE_ADDR
m88k_addr_bits_remove (addr)
     CORE_ADDR addr;
{
  return ((addr) & ~3);
}


/* 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
   INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.

   For us, the frame address is its stack pointer value, so we look up
   the function prologue to determine the caller's sp value, and return it.  */

CORE_ADDR
frame_chain (thisframe)
     struct frame_info *thisframe;
{

  frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
  /* NOTE:  this depends on frame_find_saved_regs returning the VALUE, not
 	    the ADDRESS, of SP_REGNUM.  It also depends on the cache of
	    frame_find_saved_regs results.  */
  if (thisframe->fsr->regs[SP_REGNUM])
    return thisframe->fsr->regs[SP_REGNUM];
  else
    return thisframe->frame;	/* Leaf fn -- next frame up has same SP. */
}

int
frameless_function_invocation (frame)
     struct frame_info *frame;
{

  frame_find_saved_regs (frame, (struct frame_saved_regs *) 0);
  /* NOTE:  this depends on frame_find_saved_regs returning the VALUE, not
 	    the ADDRESS, of SP_REGNUM.  It also depends on the cache of
	    frame_find_saved_regs results.  */
  if (frame->fsr->regs[SP_REGNUM])
    return 0;			/* Frameful -- return addr saved somewhere */
  else
    return 1;			/* Frameless -- no saved return address */
}

void
init_extra_frame_info (fromleaf, frame)
     int fromleaf;
     struct frame_info *frame;
{
  frame->fsr = 0;			/* Not yet allocated */
  frame->args_pointer = 0;		/* Unknown */
  frame->locals_pointer = 0;	/* Unknown */
}

/* Examine an m88k function prologue, recording the addresses at which
   registers are saved explicitly by the prologue code, and returning
   the address of the first instruction after the prologue (but not
   after the instruction at address LIMIT, as explained below).

   LIMIT places an upper bound on addresses of the instructions to be
   examined.  If the prologue code scan reaches LIMIT, the scan is
   aborted and LIMIT is returned.  This is used, when examining the
   prologue for the current frame, to keep examine_prologue () from
   claiming that a given register has been saved when in fact the
   instruction that saves it has not yet been executed.  LIMIT is used
   at other times to stop the scan when we hit code after the true
   function prologue (e.g. for the first source line) which might
   otherwise be mistaken for function prologue.

   The format of the function prologue matched by this routine is
   derived from examination of the source to gcc 1.95, particularly
   the routine output_prologue () in config/out-m88k.c.

   subu r31,r31,n			# stack pointer update

   (st rn,r31,offset)?			# save incoming regs
   (st.d rn,r31,offset)?

   (addu r30,r31,n)?			# frame pointer update

   (pic sequence)?			# PIC code prologue

   (or   rn,rm,0)?			# Move parameters to other regs
*/

/* Macros for extracting fields from instructions.  */

#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
#define	SUBU_OFFSET(x)	((unsigned)(x & 0xFFFF))
#define	ST_OFFSET(x)	((unsigned)((x) & 0xFFFF))
#define	ST_SRC(x)	EXTRACT_FIELD ((x), 21, 5)
#define	ADDU_OFFSET(x)	((unsigned)(x & 0xFFFF))

/*
 * prologue_insn_tbl is a table of instructions which may comprise a
 * function prologue.  Associated with each table entry (corresponding
 * to a single instruction or group of instructions), is an action.
 * This action is used by examine_prologue (below) to determine
 * the state of certain machine registers and where the stack frame lives.
 */

enum prologue_insn_action {
  PIA_SKIP,			/* don't care what the instruction does */
  PIA_NOTE_ST,			/* note register stored and where */
  PIA_NOTE_STD,			/* note pair of registers stored and where */
  PIA_NOTE_SP_ADJUSTMENT,	/* note stack pointer adjustment */
  PIA_NOTE_FP_ASSIGNMENT,	/* note frame pointer assignment */
  PIA_NOTE_PROLOGUE_END,	/* no more prologue */
};

struct prologue_insns {
    unsigned long insn;
    unsigned long mask;
    enum prologue_insn_action action;
};

struct prologue_insns prologue_insn_tbl[] = {
  /* Various register move instructions */
  { 0x58000000, 0xf800ffff, PIA_SKIP },		/* or/or.u with immed of 0 */
  { 0xf4005800, 0xfc1fffe0, PIA_SKIP },		/* or rd, r0, rs */
  { 0xf4005800, 0xfc00ffff, PIA_SKIP },		/* or rd, rs, r0 */

  /* Stack pointer setup: "subu sp, sp, n" where n is a multiple of 8 */
  { 0x67ff0000, 0xffff0007, PIA_NOTE_SP_ADJUSTMENT },

  /* Frame pointer assignment: "addu r30, r31, n" */
  { 0x63df0000, 0xffff0000, PIA_NOTE_FP_ASSIGNMENT },

  /* Store to stack instructions; either "st rx, sp, n" or "st.d rx, sp, n" */
  { 0x241f0000, 0xfc1f0000, PIA_NOTE_ST },	/* st rx, sp, n */
  { 0x201f0000, 0xfc1f0000, PIA_NOTE_STD },	/* st.d rs, sp, n */

  /* Instructions needed for setting up r25 for pic code. */
  { 0x5f200000, 0xffff0000, PIA_SKIP },		/* or.u r25, r0, offset_high */
  { 0xcc000002, 0xffffffff, PIA_SKIP },		/* bsr.n Lab */
  { 0x5b390000, 0xffff0000, PIA_SKIP },		/* or r25, r25, offset_low */
  { 0xf7396001, 0xffffffff, PIA_SKIP },		/* Lab: addu r25, r25, r1 */

  /* Various branch or jump instructions which have a delay slot -- these
     do not form part of the prologue, but the instruction in the delay
     slot might be a store instruction which should be noted. */
  { 0xc4000000, 0xe4000000, PIA_NOTE_PROLOGUE_END }, 
  					/* br.n, bsr.n, bb0.n, or bb1.n */
  { 0xec000000, 0xfc000000, PIA_NOTE_PROLOGUE_END }, /* bcnd.n */
  { 0xf400c400, 0xfffff7e0, PIA_NOTE_PROLOGUE_END } /* jmp.n or jsr.n */

};


/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
   is not the address of a valid instruction, the address of the next
   instruction beyond ADDR otherwise.  *PWORD1 receives the first word
   of the instruction. */

#define NEXT_PROLOGUE_INSN(addr, lim, pword1) \
  (((addr) < (lim)) ? next_insn (addr, pword1) : 0)

/* Read the m88k instruction at 'memaddr' and return the address of 
   the next instruction after that, or 0 if 'memaddr' is not the
   address of a valid instruction.  The instruction
   is stored at 'pword1'.  */

CORE_ADDR
next_insn (memaddr, pword1)
     unsigned long *pword1;
     CORE_ADDR memaddr;
{
  *pword1 = read_memory_integer (memaddr, BYTES_PER_88K_INSN);
  return memaddr + BYTES_PER_88K_INSN;
}

/* Read a register from frames called by us (or from the hardware regs).  */

static int
read_next_frame_reg(frame, regno)
     struct frame_info *frame;
     int regno;
{
  for (; frame; frame = frame->next) {
      if (regno == SP_REGNUM)
	return FRAME_FP (frame);
      else if (frame->fsr->regs[regno])
	return read_memory_integer(frame->fsr->regs[regno], 4);
  }
  return read_register(regno);
}

/* Examine the prologue of a function.  `ip' points to the first instruction.
   `limit' is the limit of the prologue (e.g. the addr of the first 
   linenumber, or perhaps the program counter if we're stepping through).
   `frame_sp' is the stack pointer value in use in this frame.  
   `fsr' is a pointer to a frame_saved_regs structure into which we put
   info about the registers saved by this frame.  
   `fi' is a struct frame_info pointer; we fill in various fields in it
   to reflect the offsets of the arg pointer and the locals pointer.  */

static CORE_ADDR
examine_prologue (ip, limit, frame_sp, fsr, fi)
     register CORE_ADDR ip;
     register CORE_ADDR limit;
     CORE_ADDR frame_sp;
     struct frame_saved_regs *fsr;
     struct frame_info *fi;
{
  register CORE_ADDR next_ip;
  register int src;
  unsigned int insn;
  int size, offset;
  char must_adjust[32];		/* If set, must adjust offsets in fsr */
  int sp_offset = -1;		/* -1 means not set (valid must be mult of 8) */
  int fp_offset = -1;		/* -1 means not set */
  CORE_ADDR frame_fp;
  CORE_ADDR prologue_end = 0;

  memset (must_adjust, '\0', sizeof (must_adjust));
  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);

  while (next_ip)
    {
      struct prologue_insns *pip; 

      for (pip=prologue_insn_tbl; (insn & pip->mask) != pip->insn; )
	  if (++pip >= prologue_insn_tbl + sizeof prologue_insn_tbl)
	      goto end_of_prologue_found;	/* not a prologue insn */

      switch (pip->action)
	{
	  case PIA_NOTE_ST:
	  case PIA_NOTE_STD:
	    if (sp_offset != -1) {
		src = ST_SRC (insn);
		offset = ST_OFFSET (insn);
		must_adjust[src] = 1;
		fsr->regs[src++] = offset;	/* Will be adjusted later */
		if (pip->action == PIA_NOTE_STD && src < 32)
		  {
		    offset += 4;
		    must_adjust[src] = 1;
		    fsr->regs[src++] = offset;
		  }
	    }
	    else
		goto end_of_prologue_found;
	    break;
	  case PIA_NOTE_SP_ADJUSTMENT:
	    if (sp_offset == -1)
		sp_offset = -SUBU_OFFSET (insn);
	    else
		goto end_of_prologue_found;
	    break;
	  case PIA_NOTE_FP_ASSIGNMENT:
	    if (fp_offset == -1)
		fp_offset = ADDU_OFFSET (insn);
	    else
		goto end_of_prologue_found;
	    break;
	  case PIA_NOTE_PROLOGUE_END:
	    if (!prologue_end)
		prologue_end = ip;
	    break;
	  case PIA_SKIP:
	  default :
	    /* Do nothing */
	    break;
	}

      ip = next_ip;
      next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
    }

end_of_prologue_found:

    if (prologue_end)
	ip = prologue_end;

  /* We're done with the prologue.  If we don't care about the stack
     frame itself, just return.  (Note that fsr->regs has been trashed,
     but the one caller who calls with fi==0 passes a dummy there.)  */

  if (fi == 0)
    return ip;

  /*
     OK, now we have:

     	sp_offset	original (before any alloca calls) displacement of SP
			(will be negative).

	fp_offset	displacement from original SP to the FP for this frame
			or -1.

	fsr->regs[0..31]	displacement from original SP to the stack
				location where reg[0..31] is stored.

	must_adjust[0..31]	set if corresponding offset was set.

     If alloca has been called between the function prologue and the current
     IP, then the current SP (frame_sp) will not be the original SP as set by
     the function prologue.  If the current SP is not the original SP, then the
     compiler will have allocated an FP for this frame, fp_offset will be set,
     and we can use it to calculate the original SP.

     Then, we figure out where the arguments and locals are, and relocate the
     offsets in fsr->regs to absolute addresses.  */

  if (fp_offset != -1) {
    /* We have a frame pointer, so get it, and base our calc's on it.  */
    frame_fp = (CORE_ADDR) read_next_frame_reg (fi->next, ACTUAL_FP_REGNUM);
    frame_sp = frame_fp - fp_offset;
  } else {
    /* We have no frame pointer, therefore frame_sp is still the same value
       as set by prologue.  But where is the frame itself?  */
    if (must_adjust[SRP_REGNUM]) {
      /* Function header saved SRP (r1), the return address.  Frame starts
	 4 bytes down from where it was saved.  */
      frame_fp = frame_sp + fsr->regs[SRP_REGNUM] - 4;
      fi->locals_pointer = frame_fp;
    } else {
      /* Function header didn't save SRP (r1), so we are in a leaf fn or
	 are otherwise confused.  */
      frame_fp = -1;
    }
  }

  /* The locals are relative to the FP (whether it exists as an allocated
     register, or just as an assumed offset from the SP) */
  fi->locals_pointer = frame_fp;

  /* The arguments are just above the SP as it was before we adjusted it
     on entry.  */
  fi->args_pointer = frame_sp - sp_offset;

  /* Now that we know the SP value used by the prologue, we know where
     it saved all the registers.  */
  for (src = 0; src < 32; src++)
    if (must_adjust[src])
      fsr->regs[src] += frame_sp;
 
  /* The saved value of the SP is always known.  */
  /* (we hope...) */
  if (fsr->regs[SP_REGNUM] != 0 
   && fsr->regs[SP_REGNUM] != frame_sp - sp_offset)
    fprintf_unfiltered(gdb_stderr, "Bad saved SP value %x != %x, offset %x!\n",
        fsr->regs[SP_REGNUM],
	frame_sp - sp_offset, sp_offset);

  fsr->regs[SP_REGNUM] = frame_sp - sp_offset;

  return (ip);
}

/* Given an ip value corresponding to the start of a function,
   return the ip of the first instruction after the function 
   prologue.  */

CORE_ADDR
m88k_skip_prologue (ip)
     CORE_ADDR (ip);
{
  struct frame_saved_regs saved_regs_dummy;
  struct symtab_and_line sal;
  CORE_ADDR limit;

  sal = find_pc_line (ip, 0);
  limit = (sal.end) ? sal.end : 0xffffffff;

  return (examine_prologue (ip, limit, (CORE_ADDR) 0, &saved_regs_dummy,
			    (struct frame_info *)0 ));
}

/* Put here the code to store, into a struct frame_saved_regs,
   the addresses of the saved registers of frame described by FRAME_INFO.
   This includes special registers such as pc and fp saved in special
   ways in the stack frame.  sp is even more special:
   the address we return for it IS the sp for the next frame.

   We cache the result of doing this in the frame_obstack, since it is
   fairly expensive.  */

void
frame_find_saved_regs (fi, fsr)
     struct frame_info *fi;
     struct frame_saved_regs *fsr;
{
  register struct frame_saved_regs *cache_fsr;
  CORE_ADDR ip;
  struct symtab_and_line sal;
  CORE_ADDR limit;

  if (!fi->fsr)
    {
      cache_fsr = (struct frame_saved_regs *)
	frame_obstack_alloc (sizeof (struct frame_saved_regs));
      memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
      fi->fsr = cache_fsr;

      /* Find the start and end of the function prologue.  If the PC
	 is in the function prologue, we only consider the part that
	 has executed already.  In the case where the PC is not in
	 the function prologue, we set limit to two instructions beyond
	 where the prologue ends in case if any of the prologue instructions
	 were moved into a delay slot of a branch instruction. */
         
      ip = get_pc_function_start (fi->pc);
      sal = find_pc_line (ip, 0);
      limit = (sal.end && sal.end < fi->pc) ? sal.end + 2 * BYTES_PER_88K_INSN 
					    : fi->pc;

      /* This will fill in fields in *fi as well as in cache_fsr.  */
#ifdef SIGTRAMP_FRAME_FIXUP
      if (fi->signal_handler_caller)
	SIGTRAMP_FRAME_FIXUP(fi->frame);
#endif
      examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
#ifdef SIGTRAMP_SP_FIXUP
      if (fi->signal_handler_caller && fi->fsr->regs[SP_REGNUM])
	SIGTRAMP_SP_FIXUP(fi->fsr->regs[SP_REGNUM]);
#endif
    }

  if (fsr)
    *fsr = *fi->fsr;
}

/* Return the address of the locals block for the frame
   described by FI.  Returns 0 if the address is unknown.
   NOTE!  Frame locals are referred to by negative offsets from the
   argument pointer, so this is the same as frame_args_address().  */

CORE_ADDR
frame_locals_address (fi)
     struct frame_info *fi;
{
  struct frame_saved_regs fsr;

  if (fi->args_pointer)	/* Cached value is likely there.  */
    return fi->args_pointer;

  /* Nope, generate it.  */

  get_frame_saved_regs (fi, &fsr);

  return fi->args_pointer;
}

/* Return the address of the argument block for the frame
   described by FI.  Returns 0 if the address is unknown.  */

CORE_ADDR
frame_args_address (fi)
     struct frame_info *fi;
{
  struct frame_saved_regs fsr;

  if (fi->args_pointer)		/* Cached value is likely there.  */
    return fi->args_pointer;

  /* Nope, generate it.  */

  get_frame_saved_regs (fi, &fsr);

  return fi->args_pointer;
}

/* Return the saved PC from this frame.

   If the frame has a memory copy of SRP_REGNUM, use that.  If not,
   just use the register SRP_REGNUM itself.  */

CORE_ADDR
frame_saved_pc (frame)
     struct frame_info *frame;
{
  return read_next_frame_reg(frame, SRP_REGNUM);
}


#define DUMMY_FRAME_SIZE 192

static void
write_word (sp, word)
     CORE_ADDR sp;
     ULONGEST word;
{
  register int len = REGISTER_SIZE;
  char buffer[MAX_REGISTER_RAW_SIZE];

  store_unsigned_integer (buffer, len, word);
  write_memory (sp, buffer, len);
}

void
m88k_push_dummy_frame()
{
  register CORE_ADDR sp = read_register (SP_REGNUM);
  register int rn;
  int offset;

  sp -= DUMMY_FRAME_SIZE;	/* allocate a bunch of space */

  for (rn = 0, offset = 0; rn <= SP_REGNUM; rn++, offset+=4)
    write_word (sp+offset, read_register(rn));
  
  write_word (sp+offset, read_register (SXIP_REGNUM));
  offset += 4;

  write_word (sp+offset, read_register (SNIP_REGNUM));
  offset += 4;

  write_word (sp+offset, read_register (SFIP_REGNUM));
  offset += 4;

  write_word (sp+offset, read_register (PSR_REGNUM));
  offset += 4;

  write_word (sp+offset, read_register (FPSR_REGNUM));
  offset += 4;

  write_word (sp+offset, read_register (FPCR_REGNUM));
  offset += 4;

  write_register (SP_REGNUM, sp);
  write_register (ACTUAL_FP_REGNUM, sp);
}

void
pop_frame ()
{
  register struct frame_info *frame = get_current_frame ();
  register CORE_ADDR fp;
  register int regnum;
  struct frame_saved_regs fsr;

  fp = FRAME_FP (frame);
  get_frame_saved_regs (frame, &fsr);

  if (PC_IN_CALL_DUMMY (read_pc (), read_register (SP_REGNUM), FRAME_FP (fi)))
    {
      /* FIXME: I think get_frame_saved_regs should be handling this so
	 that we can deal with the saved registers properly (e.g. frame
	 1 is a call dummy, the user types "frame 2" and then "print $ps").  */
      register CORE_ADDR sp = read_register (ACTUAL_FP_REGNUM);
      int offset;

      for (regnum = 0, offset = 0; regnum <= SP_REGNUM; regnum++, offset+=4)
	(void) write_register (regnum, read_memory_integer (sp+offset, 4));
  
      write_register (SXIP_REGNUM, read_memory_integer (sp+offset, 4));
      offset += 4;

      write_register (SNIP_REGNUM, read_memory_integer (sp+offset, 4));
      offset += 4;

      write_register (SFIP_REGNUM, read_memory_integer (sp+offset, 4));
      offset += 4;

      write_register (PSR_REGNUM, read_memory_integer (sp+offset, 4));
      offset += 4;

      write_register (FPSR_REGNUM, read_memory_integer (sp+offset, 4));
      offset += 4;

      write_register (FPCR_REGNUM, read_memory_integer (sp+offset, 4));
      offset += 4;

    }
  else 
    {
      for (regnum = FP_REGNUM ; regnum > 0 ; regnum--)
	  if (fsr.regs[regnum])
	      write_register (regnum,
			      read_memory_integer (fsr.regs[regnum], 4));
      write_pc (frame_saved_pc (frame));
    }
  reinit_frame_cache ();
}

void
_initialize_m88k_tdep ()
{
  tm_print_insn = print_insn_m88k;
}