aboutsummaryrefslogtreecommitdiff
path: root/sim/m32c/mem.c
blob: 690ea70a888edec94d2053f2953a473d20c67ff0 (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
/* mem.c --- memory for M32C simulator.

Copyright (C) 2005-2016 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.

This file is part of the GNU simulators.

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 3 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, see <http://www.gnu.org/licenses/>.  */


#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif

#include "mem.h"
#include "cpu.h"
#include "syscalls.h"
#include "misc.h"
#ifdef TIMER_A
#include "int.h"
#include "timer_a.h"
#endif

#define L1_BITS  (10)
#define L2_BITS  (10)
#define OFF_BITS (12)

#define L1_LEN  (1 << L1_BITS)
#define L2_LEN  (1 << L2_BITS)
#define OFF_LEN (1 << OFF_BITS)

static unsigned char **pt[L1_LEN];

#ifdef HAVE_TERMIOS_H
int m32c_console_ifd = 0;
#endif
int m32c_console_ofd = 1;
#ifdef HAVE_TERMIOS_H
int m32c_use_raw_console = 0;
#endif

#ifdef TIMER_A
Timer_A timer_a;
#endif

/* [ get=0/put=1 ][ byte size ] */
static unsigned int mem_counters[2][5];

#define COUNT(isput,bytes)                                      \
  if (verbose && enable_counting) mem_counters[isput][bytes]++

void
init_mem (void)
{
  int i, j;

  for (i = 0; i < L1_LEN; i++)
    if (pt[i])
      {
	for (j = 0; j < L2_LEN; j++)
	  if (pt[i][j])
	    free (pt[i][j]);
	free (pt[i]);
      }
  memset (pt, 0, sizeof (pt));
  memset (mem_counters, 0, sizeof (mem_counters));
}

static unsigned char *
mem_ptr (int address)
{
  static int recursing = 0;
  int pt1 = (address >> (L2_BITS + OFF_BITS)) & ((1 << L1_BITS) - 1);
  int pt2 = (address >> OFF_BITS) & ((1 << L2_BITS) - 1);
  int pto = address & ((1 << OFF_BITS) - 1);

  if (address == 0 && !recursing)
    {
      recursing = 1;
      put_reg (pc, m32c_opcode_pc);
      printf ("NULL pointer dereference at pc=0x%x\n", get_reg (pc));
      step_result = M32C_MAKE_HIT_BREAK ();
#if 0
      /* This code can be re-enabled to help diagnose NULL pointer
         bugs that aren't debuggable in GDB.  */
      m32c_dump_all_registers ();
      exit (1);
#endif
    }

  if (pt[pt1] == 0)
    pt[pt1] = (unsigned char **) calloc (L2_LEN, sizeof (char **));
  if (pt[pt1][pt2] == 0)
    {
      pt[pt1][pt2] = (unsigned char *) malloc (OFF_LEN);
      memset (pt[pt1][pt2], 0, OFF_LEN);
    }

  return pt[pt1][pt2] + pto;
}

static void
used (int rstart, int i, int j)
{
  int rend = i << (L2_BITS + OFF_BITS);
  rend += j << OFF_BITS;
  if (rstart == 0xe0000 && rend == 0xe1000)
    return;
  printf ("mem:   %08x - %08x (%dk bytes)\n", rstart, rend - 1,
	  (rend - rstart) / 1024);
}

static char *
mcs (int isput, int bytes)
{
  return comma (mem_counters[isput][bytes]);
}

void
mem_usage_stats (void)
{
  int i, j;
  int rstart = 0;
  int pending = 0;

  for (i = 0; i < L1_LEN; i++)
    if (pt[i])
      {
	for (j = 0; j < L2_LEN; j++)
	  if (pt[i][j])
	    {
	      if (!pending)
		{
		  pending = 1;
		  rstart = (i << (L2_BITS + OFF_BITS)) + (j << OFF_BITS);
		}
	    }
	  else if (pending)
	    {
	      pending = 0;
	      used (rstart, i, j);
	    }
      }
    else
      {
	if (pending)
	  {
	    pending = 0;
	    used (rstart, i, 0);
	  }
      }
  /*       mem foo: 123456789012 123456789012 123456789012 123456789012
            123456789012 */
  printf ("                 byte        short      pointer         long"
	  "        fetch\n");
  printf ("mem get: %12s %12s %12s %12s %12s\n", mcs (0, 1), mcs (0, 2),
	  mcs (0, 3), mcs (0, 4), mcs (0, 0));
  printf ("mem put: %12s %12s %12s %12s\n", mcs (1, 1), mcs (1, 2),
	  mcs (1, 3), mcs (1, 4));
}

static int tpr = 0;
static void
s (int address, char *dir)
{
  if (tpr == 0)
    printf ("MEM[%0*x] %s", membus_mask == 0xfffff ? 5 : 6, address, dir);
  tpr++;
}

#define S(d) if (trace) s(address, d)
static void
e (void)
{
  if (!trace)
    return;
  tpr--;
  if (tpr == 0)
    printf ("\n");
}

#define E() if (trace) e()

extern int m32c_disassemble;

static void
mem_put_byte (int address, unsigned char value)
{
  unsigned char *m;
  address &= membus_mask;
  m = mem_ptr (address);
  if (trace)
    printf (" %02x", value);
  *m = value;
  switch (address)
    {
    case 0x00e1:
      {
	static int old_led = -1;
	static char *led_on[] =
	  { "\033[31m O ", "\033[32m O ", "\033[34m O " };
	static char *led_off[] = { "\033[0m · ", "\033[0m · ", "\033[0m · " };
	int i;
	if (old_led != value)
	  {
	    fputs ("  ", stdout);
	    for (i = 0; i < 3; i++)
	      if (value & (1 << i))
		fputs (led_off[i], stdout);
	      else
		fputs (led_on[i], stdout);
	    fputs ("\033[0m\r", stdout);
	    fflush (stdout);
	    old_led = value;
	  }
      }
      break;
#ifdef TIMER_A
      /* M32C Timer A */
    case 0x346:		/* TA0low */
      timer_a.count = (timer_a.count & 0xff00) | value;
      timer_a.reload = timer_a.count;
      break;
    case 0x347:		/* TA0high */
      timer_a.count = (timer_a.count & 0x00ff) | (value << 8);
      timer_a.reload = timer_a.count;
      break;
    case 0x340:		/* TABSR */
      timer_a.bsr = value;
      break;
    case 0x356:		/* TA0MR */
      timer_a.mode = value;
      break;
    case 0x35f:		/* TCSPR */
      timer_a.tcspr = value;
      break;
    case 0x006c:		/* TA0IC */
      timer_a.ic = value;
      break;

      /* R8C Timer RA */
    case 0x100:		/* TRACR */
      timer_a.bsr = value;
      break;
    case 0x102:		/* TRAMR */
      timer_a.mode = value;
      break;
    case 0x104:		/* TRA */
      timer_a.count = value;
      timer_a.reload = value;
      break;
    case 0x103:		/* TRAPRE */
      timer_a.tcspr = value;
      break;
    case 0x0056:		/* TA0IC */
      timer_a.ic = value;
      break;
#endif

    case 0x2ea:		/* m32c uart1tx */
    case 0x3aa:		/* m16c uart1tx */
      {
	static int pending_exit = 0;
	if (value == 0)
	  {
	    if (pending_exit)
	      {
		step_result = M32C_MAKE_EXITED (value);
		return;
	      }
	    pending_exit = 1;
	  }
	else
	  {
	    write (m32c_console_ofd, &value, 1);
	  }
      }
      break;

    case 0x400:
      m32c_syscall (value);
      break;

    case 0x401:
      putchar (value);
      break;

    case 0x402:
      printf ("SimTrace: %06lx %02x\n", regs.r_pc, value);
      break;

    case 0x403:
      printf ("SimTrap: %06lx %02x\n", regs.r_pc, value);
      abort ();
    }
}

void
mem_put_qi (int address, unsigned char value)
{
  S ("<=");
  mem_put_byte (address, value & 0xff);
  E ();
  COUNT (1, 1);
}

void
mem_put_hi (int address, unsigned short value)
{
  if (address == 0x402)
    {
      printf ("SimTrace: %06lx %04x\n", regs.r_pc, value);
      return;
    }
  S ("<=");
  mem_put_byte (address, value & 0xff);
  mem_put_byte (address + 1, value >> 8);
  E ();
  COUNT (1, 2);
}

void
mem_put_psi (int address, unsigned long value)
{
  S ("<=");
  mem_put_byte (address, value & 0xff);
  mem_put_byte (address + 1, (value >> 8) & 0xff);
  mem_put_byte (address + 2, value >> 16);
  E ();
  COUNT (1, 3);
}

void
mem_put_si (int address, unsigned long value)
{
  S ("<=");
  mem_put_byte (address, value & 0xff);
  mem_put_byte (address + 1, (value >> 8) & 0xff);
  mem_put_byte (address + 2, (value >> 16) & 0xff);
  mem_put_byte (address + 3, (value >> 24) & 0xff);
  E ();
  COUNT (1, 4);
}

void
mem_put_blk (int address, const void *bufptr, int nbytes)
{
  S ("<=");
  if (enable_counting)
    mem_counters[1][1] += nbytes;
  while (nbytes--)
    mem_put_byte (address++, *(const unsigned char *) bufptr++);
  E ();
}

unsigned char
mem_get_pc (void)
{
  unsigned char *m = mem_ptr (regs.r_pc & membus_mask);
  COUNT (0, 0);
  return *m;
}

#ifdef HAVE_TERMIOS_H
static int console_raw = 0;
static struct termios oattr;

static int
stdin_ready (void)
{
  fd_set ifd;
  int n;
  struct timeval t;

  t.tv_sec = 0;
  t.tv_usec = 0;
  FD_ZERO (&ifd);
  FD_SET (m32c_console_ifd, &ifd);
  n = select (1, &ifd, 0, 0, &t);
  return n > 0;
}

void
m32c_sim_restore_console (void)
{
  if (console_raw)
    tcsetattr (m32c_console_ifd, TCSANOW, &oattr);
  console_raw = 0;
}
#endif

static unsigned char
mem_get_byte (int address)
{
  unsigned char *m;
  address &= membus_mask;
  m = mem_ptr (address);
  switch (address)
    {
#ifdef HAVE_TERMIOS_H
    case 0x2ed:		/* m32c uart1c1 */
    case 0x3ad:		/* m16c uart1c1 */

      if (!console_raw && m32c_use_raw_console)
	{
	  struct termios attr;
	  tcgetattr (m32c_console_ifd, &attr);
	  tcgetattr (m32c_console_ifd, &oattr);
	  /* We want each key to be sent as the user presses them.  */
	  attr.c_lflag &= ~(ICANON | ECHO | ECHOE);
	  tcsetattr (m32c_console_ifd, TCSANOW, &attr);
	  console_raw = 1;
	  atexit (m32c_sim_restore_console);
	}

      if (stdin_ready ())
	return 0x02;		/* tx empty and rx full */
      else
	return 0x0a;		/* transmitter empty */

    case 0x2ee:		/* m32c uart1 rx */
      {
	char c;
	read (m32c_console_ifd, &c, 1);
	if (m32c_console_ifd == 0 && c == 3)	/* Ctrl-C */
	  {
	    printf ("Ctrl-C!\n");
	    exit (0);
	  }

	if (m32c_console_ifd != 1)
	  {
	    if (isgraph (c))
	      printf ("\033[31m%c\033[0m", c);
	    else
	      printf ("\033[31m%02x\033[0m", c);
	  }
	return c;
      }
#endif

#ifdef TIMER_A
    case 0x346:		/* TA0low */
      return timer_a.count & 0xff;
    case 0x347:		/* TA0high */
      return (timer_a.count >> 8) & 0xff;
    case 0x104:		/* TRA */
      return timer_a.count;
#endif

    default:
      /* In case both cases above are not included.  */
      ;
    }

  S ("=>");
  if (trace)
    printf (" %02x", *m);
  E ();
  return *m;
}

unsigned char
mem_get_qi (int address)
{
  unsigned char rv;
  S ("=>");
  rv = mem_get_byte (address);
  COUNT (0, 1);
  E ();
  return rv;
}

unsigned short
mem_get_hi (int address)
{
  unsigned short rv;
  S ("=>");
  rv = mem_get_byte (address);
  rv |= mem_get_byte (address + 1) * 256;
  COUNT (0, 2);
  E ();
  return rv;
}

unsigned long
mem_get_psi (int address)
{
  unsigned long rv;
  S ("=>");
  rv = mem_get_byte (address);
  rv |= mem_get_byte (address + 1) * 256;
  rv |= mem_get_byte (address + 2) * 65536;
  COUNT (0, 3);
  E ();
  return rv;
}

unsigned long
mem_get_si (int address)
{
  unsigned long rv;
  S ("=>");
  rv = mem_get_byte (address);
  rv |= mem_get_byte (address + 1) << 8;
  rv |= mem_get_byte (address + 2) << 16;
  rv |= mem_get_byte (address + 3) << 24;
  COUNT (0, 4);
  E ();
  return rv;
}

void
mem_get_blk (int address, void *bufptr, int nbytes)
{
  S ("=>");
  if (enable_counting)
    mem_counters[0][1] += nbytes;
  while (nbytes--)
    *(char *) bufptr++ = mem_get_byte (address++);
  E ();
}

int
sign_ext (int v, int bits)
{
  if (bits < 32)
    {
      v &= (1 << bits) - 1;
      if (v & (1 << (bits - 1)))
	v -= (1 << bits);
    }
  return v;
}

#if TIMER_A
void
update_timer_a (void)
{
  if (timer_a.bsr & 1)
    {
      timer_a.prescale--;
      if (timer_a.prescale < 0)
	{
	  if (A24)
	    {
	      switch (timer_a.mode & 0xc0)
		{
		case 0x00:
		  timer_a.prescale = 0;
		  break;
		case 0x40:
		  timer_a.prescale = 8;
		  break;
		case 0x80:
		  timer_a.prescale = timer_a.tcspr & 0x0f;
		  break;
		case 0xc0:
		  timer_a.prescale = 32;
		  break;
		}
	    }
	  else
	    {
	      timer_a.prescale = timer_a.tcspr;
	    }
	  timer_a.count--;
	  if (timer_a.count < 0)
	    {
	      timer_a.count = timer_a.reload;
	      if (timer_a.ic & 7)
		{
		  if (A24)
		    mem_put_qi (0x6c, timer_a.ic | 0x08);
		  else
		    mem_put_qi (0x56, timer_a.ic | 0x08);
		}
	    }
	}
    }

  if (regs.r_flags & FLAGBIT_I	/* interrupts enabled */
      && timer_a.ic & 0x08	/* timer A interrupt triggered */
      && (timer_a.ic & 0x07) > ((regs.r_flags >> 12) & 0x07))
    {
      if (A24)
	trigger_peripheral_interrupt (12, 0x06c);
      else
	trigger_peripheral_interrupt (22, 0x056);
    }
}
#endif