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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [mn10300-tdep.c] - Blame information for rev 857

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1 24 jeremybenn
/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
2
 
3
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4
   2007, 2008 Free Software Foundation, Inc.
5
 
6
   This file is part of GDB.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
 
21
#include "defs.h"
22
#include "arch-utils.h"
23
#include "dis-asm.h"
24
#include "gdbtypes.h"
25
#include "regcache.h"
26
#include "gdb_string.h"
27
#include "gdb_assert.h"
28
#include "gdbcore.h"    /* for write_memory_unsigned_integer */
29
#include "value.h"
30
#include "gdbtypes.h"
31
#include "frame.h"
32
#include "frame-unwind.h"
33
#include "frame-base.h"
34
#include "trad-frame.h"
35
#include "symtab.h"
36
#include "dwarf2-frame.h"
37
#include "osabi.h"
38
#include "infcall.h"
39
 
40
#include "mn10300-tdep.h"
41
 
42
/* Forward decl.  */
43
extern struct trad_frame_cache *mn10300_frame_unwind_cache (struct frame_info*,
44
                                                            void **);
45
 
46
/* Compute the alignment required by a type.  */
47
 
48
static int
49
mn10300_type_align (struct type *type)
50
{
51
  int i, align = 1;
52
 
53
  switch (TYPE_CODE (type))
54
    {
55
    case TYPE_CODE_INT:
56
    case TYPE_CODE_ENUM:
57
    case TYPE_CODE_SET:
58
    case TYPE_CODE_RANGE:
59
    case TYPE_CODE_CHAR:
60
    case TYPE_CODE_BOOL:
61
    case TYPE_CODE_FLT:
62
    case TYPE_CODE_PTR:
63
    case TYPE_CODE_REF:
64
      return TYPE_LENGTH (type);
65
 
66
    case TYPE_CODE_COMPLEX:
67
      return TYPE_LENGTH (type) / 2;
68
 
69
    case TYPE_CODE_STRUCT:
70
    case TYPE_CODE_UNION:
71
      for (i = 0; i < TYPE_NFIELDS (type); i++)
72
        {
73
          int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
74
          while (align < falign)
75
            align <<= 1;
76
        }
77
      return align;
78
 
79
    case TYPE_CODE_ARRAY:
80
      /* HACK!  Structures containing arrays, even small ones, are not
81
         elligible for returning in registers.  */
82
      return 256;
83
 
84
    case TYPE_CODE_TYPEDEF:
85
      return mn10300_type_align (check_typedef (type));
86
 
87
    default:
88
      internal_error (__FILE__, __LINE__, _("bad switch"));
89
    }
90
}
91
 
92
/* Should call_function allocate stack space for a struct return?  */
93
static int
94
mn10300_use_struct_convention (struct type *type)
95
{
96
  /* Structures bigger than a pair of words can't be returned in
97
     registers.  */
98
  if (TYPE_LENGTH (type) > 8)
99
    return 1;
100
 
101
  switch (TYPE_CODE (type))
102
    {
103
    case TYPE_CODE_STRUCT:
104
    case TYPE_CODE_UNION:
105
      /* Structures with a single field are handled as the field
106
         itself.  */
107
      if (TYPE_NFIELDS (type) == 1)
108
        return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0));
109
 
110
      /* Structures with word or double-word size are passed in memory, as
111
         long as they require at least word alignment.  */
112
      if (mn10300_type_align (type) >= 4)
113
        return 0;
114
 
115
      return 1;
116
 
117
      /* Arrays are addressable, so they're never returned in
118
         registers.  This condition can only hold when the array is
119
         the only field of a struct or union.  */
120
    case TYPE_CODE_ARRAY:
121
      return 1;
122
 
123
    case TYPE_CODE_TYPEDEF:
124
      return mn10300_use_struct_convention (check_typedef (type));
125
 
126
    default:
127
      return 0;
128
    }
129
}
130
 
131
static void
132
mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
133
                            struct regcache *regcache, const void *valbuf)
134
{
135
  int len = TYPE_LENGTH (type);
136
  int reg, regsz;
137
 
138
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
139
    reg = 4;
140
  else
141
    reg = 0;
142
 
143
  regsz = register_size (gdbarch, reg);
144
 
145
  if (len <= regsz)
146
    regcache_raw_write_part (regcache, reg, 0, len, valbuf);
147
  else if (len <= 2 * regsz)
148
    {
149
      regcache_raw_write (regcache, reg, valbuf);
150
      gdb_assert (regsz == register_size (gdbarch, reg + 1));
151
      regcache_raw_write_part (regcache, reg+1, 0,
152
                               len - regsz, (char *) valbuf + regsz);
153
    }
154
  else
155
    internal_error (__FILE__, __LINE__,
156
                    _("Cannot store return value %d bytes long."), len);
157
}
158
 
159
static void
160
mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
161
                              struct regcache *regcache, void *valbuf)
162
{
163
  char buf[MAX_REGISTER_SIZE];
164
  int len = TYPE_LENGTH (type);
165
  int reg, regsz;
166
 
167
  if (TYPE_CODE (type) == TYPE_CODE_PTR)
168
    reg = 4;
169
  else
170
    reg = 0;
171
 
172
  regsz = register_size (gdbarch, reg);
173
  if (len <= regsz)
174
    {
175
      regcache_raw_read (regcache, reg, buf);
176
      memcpy (valbuf, buf, len);
177
    }
178
  else if (len <= 2 * regsz)
179
    {
180
      regcache_raw_read (regcache, reg, buf);
181
      memcpy (valbuf, buf, regsz);
182
      gdb_assert (regsz == register_size (gdbarch, reg + 1));
183
      regcache_raw_read (regcache, reg + 1, buf);
184
      memcpy ((char *) valbuf + regsz, buf, len - regsz);
185
    }
186
  else
187
    internal_error (__FILE__, __LINE__,
188
                    _("Cannot extract return value %d bytes long."), len);
189
}
190
 
191
/* Determine, for architecture GDBARCH, how a return value of TYPE
192
   should be returned.  If it is supposed to be returned in registers,
193
   and READBUF is non-zero, read the appropriate value from REGCACHE,
194
   and copy it into READBUF.  If WRITEBUF is non-zero, write the value
195
   from WRITEBUF into REGCACHE.  */
196
 
197
static enum return_value_convention
198
mn10300_return_value (struct gdbarch *gdbarch, struct type *type,
199
                      struct regcache *regcache, gdb_byte *readbuf,
200
                      const gdb_byte *writebuf)
201
{
202
  if (mn10300_use_struct_convention (type))
203
    return RETURN_VALUE_STRUCT_CONVENTION;
204
 
205
  if (readbuf)
206
    mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
207
  if (writebuf)
208
    mn10300_store_return_value (gdbarch, type, regcache, writebuf);
209
 
210
  return RETURN_VALUE_REGISTER_CONVENTION;
211
}
212
 
213
static char *
214
register_name (int reg, char **regs, long sizeof_regs)
215
{
216
  if (reg < 0 || reg >= sizeof_regs / sizeof (regs[0]))
217
    return NULL;
218
  else
219
    return regs[reg];
220
}
221
 
222
static const char *
223
mn10300_generic_register_name (struct gdbarch *gdbarch, int reg)
224
{
225
  static char *regs[] =
226
  { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
227
    "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
228
    "", "", "", "", "", "", "", "",
229
    "", "", "", "", "", "", "", "fp"
230
  };
231
  return register_name (reg, regs, sizeof regs);
232
}
233
 
234
 
235
static const char *
236
am33_register_name (struct gdbarch *gdbarch, int reg)
237
{
238
  static char *regs[] =
239
  { "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
240
    "sp", "pc", "mdr", "psw", "lir", "lar", "",
241
    "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
242
    "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""
243
  };
244
  return register_name (reg, regs, sizeof regs);
245
}
246
 
247
static const char *
248
am33_2_register_name (struct gdbarch *gdbarch, int reg)
249
{
250
  static char *regs[] =
251
  {
252
    "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
253
    "sp", "pc", "mdr", "psw", "lir", "lar", "mdrq", "r0",
254
    "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ssp",
255
    "msp", "usp", "mcrh", "mcrl", "mcvf", "fpcr", "", "",
256
    "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
257
    "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
258
    "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
259
    "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
260
  };
261
  return register_name (reg, regs, sizeof regs);
262
}
263
 
264
static struct type *
265
mn10300_register_type (struct gdbarch *gdbarch, int reg)
266
{
267
  return builtin_type_int;
268
}
269
 
270
static CORE_ADDR
271
mn10300_read_pc (struct regcache *regcache)
272
{
273
  ULONGEST val;
274
  regcache_cooked_read_unsigned (regcache, E_PC_REGNUM, &val);
275
  return val;
276
}
277
 
278
static void
279
mn10300_write_pc (struct regcache *regcache, CORE_ADDR val)
280
{
281
  regcache_cooked_write_unsigned (regcache, E_PC_REGNUM, val);
282
}
283
 
284
/* The breakpoint instruction must be the same size as the smallest
285
   instruction in the instruction set.
286
 
287
   The Matsushita mn10x00 processors have single byte instructions
288
   so we need a single byte breakpoint.  Matsushita hasn't defined
289
   one, so we defined it ourselves.  */
290
 
291
const static unsigned char *
292
mn10300_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr,
293
                            int *bp_size)
294
{
295
  static char breakpoint[] = {0xff};
296
  *bp_size = 1;
297
  return breakpoint;
298
}
299
 
300
/* Set offsets of saved registers.
301
   This is a helper function for mn10300_analyze_prologue.  */
302
 
303
static void
304
set_reg_offsets (struct frame_info *fi,
305
                  void **this_cache,
306
                  int movm_args,
307
                  int fpregmask,
308
                  int stack_extra_size,
309
                  int frame_in_fp)
310
{
311
  struct gdbarch *gdbarch;
312
  struct trad_frame_cache *cache;
313
  int offset = 0;
314
  CORE_ADDR base;
315
 
316
  if (fi == NULL || this_cache == NULL)
317
    return;
318
 
319
  cache = mn10300_frame_unwind_cache (fi, this_cache);
320
  if (cache == NULL)
321
    return;
322
  gdbarch = get_frame_arch (fi);
323
 
324
  if (frame_in_fp)
325
    {
326
      base = frame_unwind_register_unsigned (fi, E_A3_REGNUM);
327
    }
328
  else
329
    {
330
      base = frame_unwind_register_unsigned (fi, E_SP_REGNUM)
331
               + stack_extra_size;
332
    }
333
 
334
  trad_frame_set_this_base (cache, base);
335
 
336
  if (AM33_MODE (gdbarch) == 2)
337
    {
338
      /* If bit N is set in fpregmask, fsN is saved on the stack.
339
         The floating point registers are saved in ascending order.
340
         For example:  fs16 <- Frame Pointer
341
                       fs17    Frame Pointer + 4 */
342
      if (fpregmask != 0)
343
        {
344
          int i;
345
          for (i = 0; i < 32; i++)
346
            {
347
              if (fpregmask & (1 << i))
348
                {
349
                  trad_frame_set_reg_addr (cache, E_FS0_REGNUM + i,
350
                                           base + offset);
351
                  offset += 4;
352
                }
353
            }
354
        }
355
    }
356
 
357
 
358
  if (movm_args & movm_other_bit)
359
    {
360
      /* The `other' bit leaves a blank area of four bytes at the
361
         beginning of its block of saved registers, making it 32 bytes
362
         long in total.  */
363
      trad_frame_set_reg_addr (cache, E_LAR_REGNUM,    base + offset + 4);
364
      trad_frame_set_reg_addr (cache, E_LIR_REGNUM,    base + offset + 8);
365
      trad_frame_set_reg_addr (cache, E_MDR_REGNUM,    base + offset + 12);
366
      trad_frame_set_reg_addr (cache, E_A0_REGNUM + 1, base + offset + 16);
367
      trad_frame_set_reg_addr (cache, E_A0_REGNUM,     base + offset + 20);
368
      trad_frame_set_reg_addr (cache, E_D0_REGNUM + 1, base + offset + 24);
369
      trad_frame_set_reg_addr (cache, E_D0_REGNUM,     base + offset + 28);
370
      offset += 32;
371
    }
372
 
373
  if (movm_args & movm_a3_bit)
374
    {
375
      trad_frame_set_reg_addr (cache, E_A3_REGNUM, base + offset);
376
      offset += 4;
377
    }
378
  if (movm_args & movm_a2_bit)
379
    {
380
      trad_frame_set_reg_addr (cache, E_A2_REGNUM, base + offset);
381
      offset += 4;
382
    }
383
  if (movm_args & movm_d3_bit)
384
    {
385
      trad_frame_set_reg_addr (cache, E_D3_REGNUM, base + offset);
386
      offset += 4;
387
    }
388
  if (movm_args & movm_d2_bit)
389
    {
390
      trad_frame_set_reg_addr (cache, E_D2_REGNUM, base + offset);
391
      offset += 4;
392
    }
393
  if (AM33_MODE (gdbarch))
394
    {
395
      if (movm_args & movm_exother_bit)
396
        {
397
          trad_frame_set_reg_addr (cache, E_MCVF_REGNUM, base + offset);
398
          trad_frame_set_reg_addr (cache, E_MCRL_REGNUM, base + offset + 4);
399
          trad_frame_set_reg_addr (cache, E_MCRH_REGNUM, base + offset + 8);
400
          trad_frame_set_reg_addr (cache, E_MDRQ_REGNUM, base + offset + 12);
401
          trad_frame_set_reg_addr (cache, E_E1_REGNUM,   base + offset + 16);
402
          trad_frame_set_reg_addr (cache, E_E0_REGNUM,   base + offset + 20);
403
          offset += 24;
404
        }
405
      if (movm_args & movm_exreg1_bit)
406
        {
407
          trad_frame_set_reg_addr (cache, E_E7_REGNUM, base + offset);
408
          trad_frame_set_reg_addr (cache, E_E6_REGNUM, base + offset + 4);
409
          trad_frame_set_reg_addr (cache, E_E5_REGNUM, base + offset + 8);
410
          trad_frame_set_reg_addr (cache, E_E4_REGNUM, base + offset + 12);
411
          offset += 16;
412
        }
413
      if (movm_args & movm_exreg0_bit)
414
        {
415
          trad_frame_set_reg_addr (cache, E_E3_REGNUM, base + offset);
416
          trad_frame_set_reg_addr (cache, E_E2_REGNUM, base + offset + 4);
417
          offset += 8;
418
        }
419
    }
420
  /* The last (or first) thing on the stack will be the PC.  */
421
  trad_frame_set_reg_addr (cache, E_PC_REGNUM, base + offset);
422
  /* Save the SP in the 'traditional' way.
423
     This will be the same location where the PC is saved.  */
424
  trad_frame_set_reg_value (cache, E_SP_REGNUM, base + offset);
425
}
426
 
427
/* The main purpose of this file is dealing with prologues to extract
428
   information about stack frames and saved registers.
429
 
430
   In gcc/config/mn13000/mn10300.c, the expand_prologue prologue
431
   function is pretty readable, and has a nice explanation of how the
432
   prologue is generated.  The prologues generated by that code will
433
   have the following form (NOTE: the current code doesn't handle all
434
   this!):
435
 
436
   + If this is an old-style varargs function, then its arguments
437
     need to be flushed back to the stack:
438
 
439
        mov d0,(4,sp)
440
        mov d1,(4,sp)
441
 
442
   + If we use any of the callee-saved registers, save them now.
443
 
444
        movm [some callee-saved registers],(sp)
445
 
446
   + If we have any floating-point registers to save:
447
 
448
     - Decrement the stack pointer to reserve space for the registers.
449
       If the function doesn't need a frame pointer, we may combine
450
       this with the adjustment that reserves space for the frame.
451
 
452
        add -SIZE, sp
453
 
454
     - Save the floating-point registers.  We have two possible
455
       strategies:
456
 
457
       . Save them at fixed offset from the SP:
458
 
459
        fmov fsN,(OFFSETN,sp)
460
        fmov fsM,(OFFSETM,sp)
461
        ...
462
 
463
       Note that, if OFFSETN happens to be zero, you'll get the
464
       different opcode: fmov fsN,(sp)
465
 
466
       . Or, set a0 to the start of the save area, and then use
467
       post-increment addressing to save the FP registers.
468
 
469
        mov sp, a0
470
        add SIZE, a0
471
        fmov fsN,(a0+)
472
        fmov fsM,(a0+)
473
        ...
474
 
475
   + If the function needs a frame pointer, we set it here.
476
 
477
        mov sp, a3
478
 
479
   + Now we reserve space for the stack frame proper.  This could be
480
     merged into the `add -SIZE, sp' instruction for FP saves up
481
     above, unless we needed to set the frame pointer in the previous
482
     step, or the frame is so large that allocating the whole thing at
483
     once would put the FP register save slots out of reach of the
484
     addressing mode (128 bytes).
485
 
486
        add -SIZE, sp
487
 
488
   One day we might keep the stack pointer constant, that won't
489
   change the code for prologues, but it will make the frame
490
   pointerless case much more common.  */
491
 
492
/* Analyze the prologue to determine where registers are saved,
493
   the end of the prologue, etc etc.  Return the end of the prologue
494
   scanned.
495
 
496
   We store into FI (if non-null) several tidbits of information:
497
 
498
   * stack_size -- size of this stack frame.  Note that if we stop in
499
   certain parts of the prologue/epilogue we may claim the size of the
500
   current frame is zero.  This happens when the current frame has
501
   not been allocated yet or has already been deallocated.
502
 
503
   * fsr -- Addresses of registers saved in the stack by this frame.
504
 
505
   * status -- A (relatively) generic status indicator.  It's a bitmask
506
   with the following bits:
507
 
508
   MY_FRAME_IN_SP: The base of the current frame is actually in
509
   the stack pointer.  This can happen for frame pointerless
510
   functions, or cases where we're stopped in the prologue/epilogue
511
   itself.  For these cases mn10300_analyze_prologue will need up
512
   update fi->frame before returning or analyzing the register
513
   save instructions.
514
 
515
   MY_FRAME_IN_FP: The base of the current frame is in the
516
   frame pointer register ($a3).
517
 
518
   NO_MORE_FRAMES: Set this if the current frame is "start" or
519
   if the first instruction looks like mov <imm>,sp.  This tells
520
   frame chain to not bother trying to unwind past this frame.  */
521
 
522
static CORE_ADDR
523
mn10300_analyze_prologue (struct gdbarch *gdbarch, struct frame_info *fi,
524
                          void **this_cache,
525
                          CORE_ADDR pc)
526
{
527
  CORE_ADDR func_addr, func_end, addr, stop;
528
  long stack_extra_size = 0;
529
  int imm_size;
530
  unsigned char buf[4];
531
  int status;
532
  int movm_args = 0;
533
  int fpregmask = 0;
534
  char *name;
535
  int frame_in_fp = 0;
536
 
537
  /* Use the PC in the frame if it's provided to look up the
538
     start of this function.
539
 
540
     Note: kevinb/2003-07-16: We used to do the following here:
541
        pc = (fi ? get_frame_pc (fi) : pc);
542
     But this is (now) badly broken when called from analyze_dummy_frame().
543
  */
544
  if (fi)
545
    {
546
      pc = (pc ? pc : get_frame_pc (fi));
547
    }
548
 
549
  /* Find the start of this function.  */
550
  status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
551
 
552
  /* Do nothing if we couldn't find the start of this function
553
 
554
     MVS: comment went on to say "or if we're stopped at the first
555
     instruction in the prologue" -- but code doesn't reflect that,
556
     and I don't want to do that anyway.  */
557
  if (status == 0)
558
    {
559
      addr = pc;
560
      goto finish_prologue;
561
    }
562
 
563
  /* If we're in start, then give up.  */
564
  if (strcmp (name, "start") == 0)
565
    {
566
      addr = pc;
567
      goto finish_prologue;
568
    }
569
 
570
  /* Figure out where to stop scanning.  */
571
  stop = fi ? pc : func_end;
572
 
573
  /* Don't walk off the end of the function.  */
574
  stop = stop > func_end ? func_end : stop;
575
 
576
  /* Start scanning on the first instruction of this function.  */
577
  addr = func_addr;
578
 
579
  /* Suck in two bytes.  */
580
  if (addr + 2 > stop || !safe_frame_unwind_memory (fi, addr, buf, 2))
581
    goto finish_prologue;
582
 
583
  /* First see if this insn sets the stack pointer from a register; if
584
     so, it's probably the initialization of the stack pointer in _start,
585
     so mark this as the bottom-most frame.  */
586
  if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
587
    {
588
      goto finish_prologue;
589
    }
590
 
591
  /* Now look for movm [regs],sp, which saves the callee saved registers.
592
 
593
     At this time we don't know if fi->frame is valid, so we only note
594
     that we encountered a movm instruction.  Later, we'll set the entries
595
     in fsr.regs as needed.  */
596
  if (buf[0] == 0xcf)
597
    {
598
      /* Extract the register list for the movm instruction.  */
599
      movm_args = buf[1];
600
 
601
      addr += 2;
602
 
603
      /* Quit now if we're beyond the stop point.  */
604
      if (addr >= stop)
605
        goto finish_prologue;
606
 
607
      /* Get the next two bytes so the prologue scan can continue.  */
608
      if (!safe_frame_unwind_memory (fi, addr, buf, 2))
609
        goto finish_prologue;
610
    }
611
 
612
  /* Check for "mov pc, a2", an instruction found in optimized, position
613
     independent code.  Skip it if found.  */
614
  if (buf[0] == 0xf0 && buf[1] == 0x2e)
615
    {
616
      addr += 2;
617
 
618
      /* Quit now if we're beyond the stop point.  */
619
      if (addr >= stop)
620
        goto finish_prologue;
621
 
622
      /* Get the next two bytes so the prologue scan can continue.  */
623
      status = read_memory_nobpt (addr, buf, 2);
624
      if (status != 0)
625
        goto finish_prologue;
626
    }
627
 
628
  if (AM33_MODE (gdbarch) == 2)
629
    {
630
      /* Determine if any floating point registers are to be saved.
631
         Look for one of the following three prologue formats:
632
 
633
        [movm [regs],(sp)] [movm [regs],(sp)] [movm [regs],(sp)]
634
 
635
         add -SIZE,sp       add -SIZE,sp       add -SIZE,sp
636
         fmov fs#,(sp)      mov sp,a0/a1       mov sp,a0/a1
637
         fmov fs#,(#,sp)    fmov fs#,(a0/a1+)  add SIZE2,a0/a1
638
         ...                ...                fmov fs#,(a0/a1+)
639
         ...                ...                ...
640
         fmov fs#,(#,sp)    fmov fs#,(a0/a1+)  fmov fs#,(a0/a1+)
641
 
642
        [mov sp,a3]        [mov sp,a3]
643
        [add -SIZE2,sp]    [add -SIZE2,sp]                                 */
644
 
645
      /* Remember the address at which we started in the event that we
646
         don't ultimately find an fmov instruction.  Once we're certain
647
         that we matched one of the above patterns, we'll set
648
         ``restore_addr'' to the appropriate value.  Note: At one time
649
         in the past, this code attempted to not adjust ``addr'' until
650
         there was a fair degree of certainty that the pattern would be
651
         matched.  However, that code did not wait until an fmov instruction
652
         was actually encountered.  As a consequence, ``addr'' would
653
         sometimes be advanced even when no fmov instructions were found.  */
654
      CORE_ADDR restore_addr = addr;
655
      int fmov_found = 0;
656
 
657
      /* First, look for add -SIZE,sp (i.e. add imm8,sp  (0xf8feXX)
658
                                         or add imm16,sp (0xfafeXXXX)
659
                                         or add imm32,sp (0xfcfeXXXXXXXX)) */
660
      imm_size = 0;
661
      if (buf[0] == 0xf8 && buf[1] == 0xfe)
662
        imm_size = 1;
663
      else if (buf[0] == 0xfa && buf[1] == 0xfe)
664
        imm_size = 2;
665
      else if (buf[0] == 0xfc && buf[1] == 0xfe)
666
        imm_size = 4;
667
      if (imm_size != 0)
668
        {
669
          /* An "add -#,sp" instruction has been found. "addr + 2 + imm_size"
670
             is the address of the next instruction. Don't modify "addr" until
671
             the next "floating point prologue" instruction is found. If this
672
             is not a prologue that saves floating point registers we need to
673
             be able to back out of this bit of code and continue with the
674
             prologue analysis. */
675
          if (addr + 2 + imm_size < stop)
676
            {
677
              if (!safe_frame_unwind_memory (fi, addr + 2 + imm_size, buf, 3))
678
                goto finish_prologue;
679
              if ((buf[0] & 0xfc) == 0x3c)
680
                {
681
                  /* Occasionally, especially with C++ code, the "fmov"
682
                     instructions will be preceded by "mov sp,aN"
683
                     (aN => a0, a1, a2, or a3).
684
 
685
                     This is a one byte instruction:  mov sp,aN = 0011 11XX
686
                     where XX is the register number.
687
 
688
                     Skip this instruction by incrementing addr.  The "fmov"
689
                     instructions will have the form "fmov fs#,(aN+)" in this
690
                     case, but that will not necessitate a change in the
691
                     "fmov" parsing logic below. */
692
 
693
                  addr++;
694
 
695
                  if ((buf[1] & 0xfc) == 0x20)
696
                    {
697
                      /* Occasionally, especially with C++ code compiled with
698
                         the -fomit-frame-pointer or -O3 options, the
699
                         "mov sp,aN" instruction will be followed by an
700
                         "add #,aN" instruction. This indicates the
701
                         "stack_size", the size of the portion of the stack
702
                         containing the arguments. This instruction format is:
703
                         add #,aN = 0010 00XX YYYY YYYY
704
                         where XX        is the register number
705
                               YYYY YYYY is the constant.
706
                         Note the size of the stack (as a negative number) in
707
                         the frame info structure. */
708
                      if (fi)
709
                        stack_extra_size += -buf[2];
710
 
711
                      addr += 2;
712
                    }
713
                }
714
 
715
              if ((buf[0] & 0xfc) == 0x3c ||
716
                  buf[0] == 0xf9 || buf[0] == 0xfb)
717
                {
718
                  /* An "fmov" instruction has been found indicating that this
719
                     prologue saves floating point registers (or, as described
720
                     above, a "mov sp,aN" and possible "add #,aN" have been
721
                     found and we will assume an "fmov" follows). Process the
722
                     consecutive "fmov" instructions. */
723
                  for (addr += 2 + imm_size;;addr += imm_size)
724
                    {
725
                      int regnum;
726
 
727
                      /* Read the "fmov" instruction. */
728
                      if (addr >= stop ||
729
                          !safe_frame_unwind_memory (fi, addr, buf, 4))
730
                        goto finish_prologue;
731
 
732
                      if (buf[0] != 0xf9 && buf[0] != 0xfb)
733
                        break;
734
 
735
                      /* An fmov instruction has just been seen.  We can
736
                         now really commit to the pattern match.  */
737
 
738
                      fmov_found = 1;
739
 
740
                      /* Get the floating point register number from the
741
                         2nd and 3rd bytes of the "fmov" instruction:
742
                         Machine Code: 0000 00X0 YYYY 0000 =>
743
                         Regnum: 000X YYYY */
744
                      regnum = (buf[1] & 0x02) << 3;
745
                      regnum |= ((buf[2] & 0xf0) >> 4) & 0x0f;
746
 
747
                      /* Add this register number to the bit mask of floating
748
                         point registers that have been saved. */
749
                      fpregmask |= 1 << regnum;
750
 
751
                      /* Determine the length of this "fmov" instruction.
752
                         fmov fs#,(sp)   => 3 byte instruction
753
                         fmov fs#,(#,sp) => 4 byte instruction */
754
                      imm_size = (buf[0] == 0xf9) ? 3 : 4;
755
                    }
756
                }
757
            }
758
        }
759
      /* If no fmov instructions were found by the above sequence, reset
760
         the state and pretend that the above bit of code never happened.  */
761
      if (!fmov_found)
762
        {
763
          addr = restore_addr;
764
          status = read_memory_nobpt (addr, buf, 2);
765
          if (status != 0)
766
            goto finish_prologue;
767
          stack_extra_size = 0;
768
        }
769
    }
770
 
771
  /* Now see if we set up a frame pointer via "mov sp,a3" */
772
  if (buf[0] == 0x3f)
773
    {
774
      addr += 1;
775
 
776
      /* The frame pointer is now valid.  */
777
      if (fi)
778
        {
779
          frame_in_fp = 1;
780
        }
781
 
782
      /* Quit now if we're beyond the stop point.  */
783
      if (addr >= stop)
784
        goto finish_prologue;
785
 
786
      /* Get two more bytes so scanning can continue.  */
787
      if (!safe_frame_unwind_memory (fi, addr, buf, 2))
788
        goto finish_prologue;
789
    }
790
 
791
  /* Next we should allocate the local frame.  No more prologue insns
792
     are found after allocating the local frame.
793
 
794
     Search for add imm8,sp (0xf8feXX)
795
     or add imm16,sp (0xfafeXXXX)
796
     or add imm32,sp (0xfcfeXXXXXXXX).
797
 
798
     If none of the above was found, then this prologue has no
799
     additional stack.  */
800
 
801
  imm_size = 0;
802
  if (buf[0] == 0xf8 && buf[1] == 0xfe)
803
    imm_size = 1;
804
  else if (buf[0] == 0xfa && buf[1] == 0xfe)
805
    imm_size = 2;
806
  else if (buf[0] == 0xfc && buf[1] == 0xfe)
807
    imm_size = 4;
808
 
809
  if (imm_size != 0)
810
    {
811
      /* Suck in imm_size more bytes, they'll hold the size of the
812
         current frame.  */
813
      if (!safe_frame_unwind_memory (fi, addr + 2, buf, imm_size))
814
        goto finish_prologue;
815
 
816
      /* Note the size of the stack.  */
817
      stack_extra_size -= extract_signed_integer (buf, imm_size);
818
 
819
      /* We just consumed 2 + imm_size bytes.  */
820
      addr += 2 + imm_size;
821
 
822
      /* No more prologue insns follow, so begin preparation to return.  */
823
      goto finish_prologue;
824
    }
825
  /* Do the essentials and get out of here.  */
826
 finish_prologue:
827
  /* Note if/where callee saved registers were saved.  */
828
  if (fi)
829
    set_reg_offsets (fi, this_cache, movm_args, fpregmask, stack_extra_size,
830
                     frame_in_fp);
831
  return addr;
832
}
833
 
834
/* Function: skip_prologue
835
   Return the address of the first inst past the prologue of the function.  */
836
 
837
static CORE_ADDR
838
mn10300_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
839
{
840
  return mn10300_analyze_prologue (gdbarch, NULL, NULL, pc);
841
}
842
 
843
/* Simple frame_unwind_cache.
844
   This finds the "extra info" for the frame.  */
845
struct trad_frame_cache *
846
mn10300_frame_unwind_cache (struct frame_info *next_frame,
847
                            void **this_prologue_cache)
848
{
849
  struct gdbarch *gdbarch;
850
  struct trad_frame_cache *cache;
851
  CORE_ADDR pc, start, end;
852
  void *cache_p;
853
 
854
  if (*this_prologue_cache)
855
    return (*this_prologue_cache);
856
 
857
  gdbarch = get_frame_arch (next_frame);
858
  cache_p = trad_frame_cache_zalloc (next_frame);
859
  pc = gdbarch_unwind_pc (gdbarch, next_frame);
860
  mn10300_analyze_prologue (gdbarch, next_frame, &cache_p, pc);
861
  cache = cache_p;
862
 
863
  if (find_pc_partial_function (pc, NULL, &start, &end))
864
    trad_frame_set_id (cache,
865
                       frame_id_build (trad_frame_get_this_base (cache),
866
                                       start));
867
  else
868
    {
869
      start = frame_func_unwind (next_frame, NORMAL_FRAME);
870
      trad_frame_set_id (cache,
871
                         frame_id_build (trad_frame_get_this_base (cache),
872
                                         start));
873
    }
874
 
875
  (*this_prologue_cache) = cache;
876
  return cache;
877
}
878
 
879
/* Here is a dummy implementation.  */
880
static struct frame_id
881
mn10300_unwind_dummy_id (struct gdbarch *gdbarch,
882
                         struct frame_info *next_frame)
883
{
884
  return frame_id_build (frame_sp_unwind (next_frame),
885
                         frame_pc_unwind (next_frame));
886
}
887
 
888
/* Trad frame implementation.  */
889
static void
890
mn10300_frame_this_id (struct frame_info *next_frame,
891
                       void **this_prologue_cache,
892
                       struct frame_id *this_id)
893
{
894
  struct trad_frame_cache *cache =
895
    mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
896
 
897
  trad_frame_get_id (cache, this_id);
898
}
899
 
900
static void
901
mn10300_frame_prev_register (struct frame_info *next_frame,
902
                             void **this_prologue_cache,
903
                             int regnum, int *optimizedp,
904
                             enum lval_type *lvalp, CORE_ADDR *addrp,
905
                             int *realnump, gdb_byte *bufferp)
906
{
907
  struct trad_frame_cache *cache =
908
    mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
909
 
910
  trad_frame_get_register (cache, next_frame, regnum, optimizedp,
911
                           lvalp, addrp, realnump, bufferp);
912
  /* Or...
913
  trad_frame_get_prev_register (next_frame, cache->prev_regs, regnum,
914
                           optimizedp, lvalp, addrp, realnump, bufferp);
915
  */
916
}
917
 
918
static const struct frame_unwind mn10300_frame_unwind = {
919
  NORMAL_FRAME,
920
  mn10300_frame_this_id,
921
  mn10300_frame_prev_register
922
};
923
 
924
static CORE_ADDR
925
mn10300_frame_base_address (struct frame_info *next_frame,
926
                            void **this_prologue_cache)
927
{
928
  struct trad_frame_cache *cache =
929
    mn10300_frame_unwind_cache (next_frame, this_prologue_cache);
930
 
931
  return trad_frame_get_this_base (cache);
932
}
933
 
934
static const struct frame_unwind *
935
mn10300_frame_sniffer (struct frame_info *next_frame)
936
{
937
  return &mn10300_frame_unwind;
938
}
939
 
940
static const struct frame_base mn10300_frame_base = {
941
  &mn10300_frame_unwind,
942
  mn10300_frame_base_address,
943
  mn10300_frame_base_address,
944
  mn10300_frame_base_address
945
};
946
 
947
static CORE_ADDR
948
mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
949
{
950
  ULONGEST pc;
951
 
952
  pc = frame_unwind_register_unsigned (next_frame, E_PC_REGNUM);
953
  return pc;
954
}
955
 
956
static CORE_ADDR
957
mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
958
{
959
  ULONGEST sp;
960
 
961
  sp = frame_unwind_register_unsigned (next_frame, E_SP_REGNUM);
962
  return sp;
963
}
964
 
965
static void
966
mn10300_frame_unwind_init (struct gdbarch *gdbarch)
967
{
968
  frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
969
  frame_unwind_append_sniffer (gdbarch, mn10300_frame_sniffer);
970
  frame_base_set_default (gdbarch, &mn10300_frame_base);
971
  set_gdbarch_unwind_dummy_id (gdbarch, mn10300_unwind_dummy_id);
972
  set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
973
  set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
974
}
975
 
976
/* Function: push_dummy_call
977
 *
978
 * Set up machine state for a target call, including
979
 * function arguments, stack, return address, etc.
980
 *
981
 */
982
 
983
static CORE_ADDR
984
mn10300_push_dummy_call (struct gdbarch *gdbarch,
985
                         struct value *target_func,
986
                         struct regcache *regcache,
987
                         CORE_ADDR bp_addr,
988
                         int nargs, struct value **args,
989
                         CORE_ADDR sp,
990
                         int struct_return,
991
                         CORE_ADDR struct_addr)
992
{
993
  const int push_size = register_size (gdbarch, E_PC_REGNUM);
994
  int regs_used;
995
  int len, arg_len;
996
  int stack_offset = 0;
997
  int argnum;
998
  char *val, valbuf[MAX_REGISTER_SIZE];
999
 
1000
  /* This should be a nop, but align the stack just in case something
1001
     went wrong.  Stacks are four byte aligned on the mn10300.  */
1002
  sp &= ~3;
1003
 
1004
  /* Now make space on the stack for the args.
1005
 
1006
     XXX This doesn't appear to handle pass-by-invisible reference
1007
     arguments.  */
1008
  regs_used = struct_return ? 1 : 0;
1009
  for (len = 0, argnum = 0; argnum < nargs; argnum++)
1010
    {
1011
      arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
1012
      while (regs_used < 2 && arg_len > 0)
1013
        {
1014
          regs_used++;
1015
          arg_len -= push_size;
1016
        }
1017
      len += arg_len;
1018
    }
1019
 
1020
  /* Allocate stack space.  */
1021
  sp -= len;
1022
 
1023
  if (struct_return)
1024
    {
1025
      regs_used = 1;
1026
      regcache_cooked_write_unsigned (regcache, E_D0_REGNUM, struct_addr);
1027
    }
1028
  else
1029
    regs_used = 0;
1030
 
1031
  /* Push all arguments onto the stack. */
1032
  for (argnum = 0; argnum < nargs; argnum++)
1033
    {
1034
      /* FIXME what about structs?  Unions?  */
1035
      if (TYPE_CODE (value_type (*args)) == TYPE_CODE_STRUCT
1036
          && TYPE_LENGTH (value_type (*args)) > 8)
1037
        {
1038
          /* Change to pointer-to-type.  */
1039
          arg_len = push_size;
1040
          store_unsigned_integer (valbuf, push_size,
1041
                                  VALUE_ADDRESS (*args));
1042
          val = &valbuf[0];
1043
        }
1044
      else
1045
        {
1046
          arg_len = TYPE_LENGTH (value_type (*args));
1047
          val = (char *) value_contents (*args);
1048
        }
1049
 
1050
      while (regs_used < 2 && arg_len > 0)
1051
        {
1052
          regcache_cooked_write_unsigned (regcache, regs_used,
1053
                                  extract_unsigned_integer (val, push_size));
1054
          val += push_size;
1055
          arg_len -= push_size;
1056
          regs_used++;
1057
        }
1058
 
1059
      while (arg_len > 0)
1060
        {
1061
          write_memory (sp + stack_offset, val, push_size);
1062
          arg_len -= push_size;
1063
          val += push_size;
1064
          stack_offset += push_size;
1065
        }
1066
 
1067
      args++;
1068
    }
1069
 
1070
  /* Make space for the flushback area.  */
1071
  sp -= 8;
1072
 
1073
  /* Push the return address that contains the magic breakpoint.  */
1074
  sp -= 4;
1075
  write_memory_unsigned_integer (sp, push_size, bp_addr);
1076
 
1077
  /* The CPU also writes the return address always into the
1078
     MDR register on "call".  */
1079
  regcache_cooked_write_unsigned (regcache, E_MDR_REGNUM, bp_addr);
1080
 
1081
  /* Update $sp.  */
1082
  regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
1083
 
1084
  /* On the mn10300, it's possible to move some of the stack adjustment
1085
     and saving of the caller-save registers out of the prologue and
1086
     into the call sites.  (When using gcc, this optimization can
1087
     occur when using the -mrelax switch.) If this occurs, the dwarf2
1088
     info will reflect this fact.  We can test to see if this is the
1089
     case by creating a new frame using the current stack pointer and
1090
     the address of the function that we're about to call.  We then
1091
     unwind SP and see if it's different than the SP of our newly
1092
     created frame.  If the SP values are the same, the caller is not
1093
     expected to allocate any additional stack.  On the other hand, if
1094
     the SP values are different, the difference determines the
1095
     additional stack that must be allocated.
1096
 
1097
     Note that we don't update the return value though because that's
1098
     the value of the stack just after pushing the arguments, but prior
1099
     to performing the call.  This value is needed in order to
1100
     construct the frame ID of the dummy call.   */
1101
  {
1102
    CORE_ADDR func_addr = find_function_addr (target_func, NULL);
1103
    CORE_ADDR unwound_sp
1104
      = mn10300_unwind_sp (gdbarch, create_new_frame (sp, func_addr));
1105
    if (sp != unwound_sp)
1106
      regcache_cooked_write_unsigned (regcache, E_SP_REGNUM,
1107
                                      sp - (unwound_sp - sp));
1108
  }
1109
 
1110
  return sp;
1111
}
1112
 
1113
/* If DWARF2 is a register number appearing in Dwarf2 debug info, then
1114
   mn10300_dwarf2_reg_to_regnum (DWARF2) is the corresponding GDB
1115
   register number.  Why don't Dwarf2 and GDB use the same numbering?
1116
   Who knows?  But since people have object files lying around with
1117
   the existing Dwarf2 numbering, and other people have written stubs
1118
   to work with the existing GDB, neither of them can change.  So we
1119
   just have to cope.  */
1120
static int
1121
mn10300_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int dwarf2)
1122
{
1123
  /* This table is supposed to be shaped like the gdbarch_register_name
1124
     initializer in gcc/config/mn10300/mn10300.h.  Registers which
1125
     appear in GCC's numbering, but have no counterpart in GDB's
1126
     world, are marked with a -1.  */
1127
  static int dwarf2_to_gdb[] = {
1128
    0,  1,  2,  3,  4,  5,  6,  7, -1, 8,
1129
    15, 16, 17, 18, 19, 20, 21, 22,
1130
    32, 33, 34, 35, 36, 37, 38, 39,
1131
    40, 41, 42, 43, 44, 45, 46, 47,
1132
    48, 49, 50, 51, 52, 53, 54, 55,
1133
    56, 57, 58, 59, 60, 61, 62, 63,
1134
    9
1135
  };
1136
 
1137
  if (dwarf2 < 0
1138
      || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb))
1139
    {
1140
      warning (_("Bogus register number in debug info: %d"), dwarf2);
1141
      return -1;
1142
    }
1143
 
1144
  return dwarf2_to_gdb[dwarf2];
1145
}
1146
 
1147
static struct gdbarch *
1148
mn10300_gdbarch_init (struct gdbarch_info info,
1149
                      struct gdbarch_list *arches)
1150
{
1151
  struct gdbarch *gdbarch;
1152
  struct gdbarch_tdep *tdep;
1153
  int num_regs;
1154
 
1155
  arches = gdbarch_list_lookup_by_info (arches, &info);
1156
  if (arches != NULL)
1157
    return arches->gdbarch;
1158
 
1159
  tdep = xmalloc (sizeof (struct gdbarch_tdep));
1160
  gdbarch = gdbarch_alloc (&info, tdep);
1161
 
1162
  switch (info.bfd_arch_info->mach)
1163
    {
1164
    case 0:
1165
    case bfd_mach_mn10300:
1166
      set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
1167
      tdep->am33_mode = 0;
1168
      num_regs = 32;
1169
      break;
1170
    case bfd_mach_am33:
1171
      set_gdbarch_register_name (gdbarch, am33_register_name);
1172
      tdep->am33_mode = 1;
1173
      num_regs = 32;
1174
      break;
1175
    case bfd_mach_am33_2:
1176
      set_gdbarch_register_name (gdbarch, am33_2_register_name);
1177
      tdep->am33_mode = 2;
1178
      num_regs = 64;
1179
      set_gdbarch_fp0_regnum (gdbarch, 32);
1180
      break;
1181
    default:
1182
      internal_error (__FILE__, __LINE__,
1183
                      _("mn10300_gdbarch_init: Unknown mn10300 variant"));
1184
      break;
1185
    }
1186
 
1187
  /* Registers.  */
1188
  set_gdbarch_num_regs (gdbarch, num_regs);
1189
  set_gdbarch_register_type (gdbarch, mn10300_register_type);
1190
  set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
1191
  set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
1192
  set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
1193
  set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
1194
  set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
1195
  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
1196
 
1197
  /* Stack unwinding.  */
1198
  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1199
  /* Breakpoints.  */
1200
  set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
1201
  /* decr_pc_after_break? */
1202
  /* Disassembly.  */
1203
  set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
1204
 
1205
  /* Stage 2 */
1206
  set_gdbarch_return_value (gdbarch, mn10300_return_value);
1207
 
1208
  /* Stage 3 -- get target calls working.  */
1209
  set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
1210
  /* set_gdbarch_return_value (store, extract) */
1211
 
1212
 
1213
  mn10300_frame_unwind_init (gdbarch);
1214
 
1215
  /* Hook in ABI-specific overrides, if they have been registered.  */
1216
  gdbarch_init_osabi (info, gdbarch);
1217
 
1218
  return gdbarch;
1219
}
1220
 
1221
/* Dump out the mn10300 specific architecture information. */
1222
 
1223
static void
1224
mn10300_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
1225
{
1226
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1227
  fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
1228
                      tdep->am33_mode);
1229
}
1230
 
1231
void
1232
_initialize_mn10300_tdep (void)
1233
{
1234
  gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
1235
}
1236
 

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