aboutsummaryrefslogtreecommitdiff
path: root/gdb/serial.c
blob: 3853014ef9751f549e5849c083ef1109c399fb7e (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
/* Generic serial interface routines
   Copyright 1992, 1993, 1996, 1997, 1999 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 <ctype.h>
#include "serial.h"
#include "gdb_string.h"
#include "gdbcmd.h"

extern void _initialize_serial (void);

/* Linked list of serial I/O handlers */

static struct serial_ops *serial_ops_list = NULL;

/* This is the last serial stream opened.  Used by connect command. */

static serial_t last_serial_opened = NULL;

/* Pointer to list of scb's. */

static serial_t scb_base;

/* Non-NULL gives filename which contains a recording of the remote session,
   suitable for playback by gdbserver. */

static char *serial_logfile = NULL;
static GDB_FILE *serial_logfp = NULL;

static struct serial_ops *serial_interface_lookup (char *);
static void serial_logchar (int, int, int);
static char logbase_hex[] = "hex";
static char logbase_octal[] = "octal";
static char logbase_ascii[] = "ascii";
static char *logbase_enums[] =
{logbase_hex, logbase_octal, logbase_ascii, NULL};
static char *serial_logbase = logbase_ascii;



static int serial_current_type = 0;

/* Log char CH of type CHTYPE, with TIMEOUT */

/* Define bogus char to represent a BREAK.  Should be careful to choose a value
   that can't be confused with a normal char, or an error code.  */
#define SERIAL_BREAK 1235

static void
serial_logchar (int ch_type, int ch, int timeout)
{
  if (ch_type != serial_current_type)
    {
      fprintf_unfiltered (serial_logfp, "\n%c ", ch_type);
      serial_current_type = ch_type;
    }

  if (serial_logbase != logbase_ascii)
    fputc_unfiltered (' ', serial_logfp);

  switch (ch)
    {
    case SERIAL_TIMEOUT:
      fprintf_unfiltered (serial_logfp, "<Timeout: %d seconds>", timeout);
      return;
    case SERIAL_ERROR:
      fprintf_unfiltered (serial_logfp, "<Error: %s>", safe_strerror (errno));
      return;
    case SERIAL_EOF:
      fputs_unfiltered ("<Eof>", serial_logfp);
      return;
    case SERIAL_BREAK:
      fputs_unfiltered ("<Break>", serial_logfp);
      return;
    default:
      if (serial_logbase == logbase_hex)
	fprintf_unfiltered (serial_logfp, "%02x", ch & 0xff);
      else if (serial_logbase == logbase_octal)
	fprintf_unfiltered (serial_logfp, "%03o", ch & 0xff);
      else
	switch (ch)
	  {
	  case '\\':
	    fputs_unfiltered ("\\\\", serial_logfp);
	    break;
	  case '\b':
	    fputs_unfiltered ("\\b", serial_logfp);
	    break;
	  case '\f':
	    fputs_unfiltered ("\\f", serial_logfp);
	    break;
	  case '\n':
	    fputs_unfiltered ("\\n", serial_logfp);
	    break;
	  case '\r':
	    fputs_unfiltered ("\\r", serial_logfp);
	    break;
	  case '\t':
	    fputs_unfiltered ("\\t", serial_logfp);
	    break;
	  case '\v':
	    fputs_unfiltered ("\\v", serial_logfp);
	    break;
	  default:
	    fprintf_unfiltered (serial_logfp, isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
	    break;
	  }
    }
}

void
serial_log_command (const char *cmd)
{
  if (!serial_logfp)
    return;

  serial_current_type = 'c';

  fputs_unfiltered ("\nc ", serial_logfp);
  fputs_unfiltered (cmd, serial_logfp);

  /* Make sure that the log file is as up-to-date as possible,
     in case we are getting ready to dump core or something. */
  gdb_flush (serial_logfp);
}


static struct serial_ops *
serial_interface_lookup (char *name)
{
  struct serial_ops *ops;

  for (ops = serial_ops_list; ops; ops = ops->next)
    if (strcmp (name, ops->name) == 0)
      return ops;

  return NULL;
}

void
serial_add_interface (struct serial_ops *optable)
{
  optable->next = serial_ops_list;
  serial_ops_list = optable;
}

/* Open up a device or a network socket, depending upon the syntax of NAME. */

serial_t
serial_open (const char *name)
{
  serial_t scb;
  struct serial_ops *ops;
  const char *open_name = name;

  for (scb = scb_base; scb; scb = scb->next)
    if (scb->name && strcmp (scb->name, name) == 0)
      {
	scb->refcnt++;
	return scb;
      }

  if (strcmp (name, "ocd") == 0)
    ops = serial_interface_lookup ("ocd");
  else if (strcmp (name, "pc") == 0)
    ops = serial_interface_lookup ("pc");
  else if (strchr (name, ':'))
    ops = serial_interface_lookup ("tcp");
  else if (strncmp (name, "lpt", 3) == 0)
    ops = serial_interface_lookup ("parallel");
  else if (strncmp (name, "|", 1) == 0)
    {
      ops = serial_interface_lookup ("pipe");
      open_name = name + 1; /* discard ``|'' */
    }
  else
    ops = serial_interface_lookup ("hardwire");

  if (!ops)
    return NULL;

  scb = (serial_t) xmalloc (sizeof (struct _serial_t));

  scb->ops = ops;

  scb->bufcnt = 0;
  scb->bufp = scb->buf;

  if (scb->ops->open (scb, open_name))
    {
      free (scb);
      return NULL;
    }

  scb->name = strsave (name);
  scb->next = scb_base;
  scb->refcnt = 1;
  scb->async_handler = NULL;
  scb->async_context = NULL;
  scb_base = scb;

  last_serial_opened = scb;

  if (serial_logfile != NULL)
    {
      serial_logfp = gdb_fopen (serial_logfile, "w");
      if (serial_logfp == NULL)
	perror_with_name (serial_logfile);
    }

  return scb;
}

serial_t
serial_fdopen (const int fd)
{
  serial_t scb;
  struct serial_ops *ops;

  for (scb = scb_base; scb; scb = scb->next)
    if (scb->fd == fd)
      {
	scb->refcnt++;
	return scb;
      }

  ops = serial_interface_lookup ("hardwire");

  if (!ops)
    return NULL;

  scb = (serial_t) xmalloc (sizeof (struct _serial_t));

  scb->ops = ops;

  scb->bufcnt = 0;
  scb->bufp = scb->buf;

  scb->fd = fd;

  scb->name = NULL;
  scb->next = scb_base;
  scb->refcnt = 1;
  scb->async_handler = NULL;
  scb->async_context = NULL;
  scb_base = scb;

  last_serial_opened = scb;

  return scb;
}

static void
do_serial_close (serial_t scb, int really_close)
{
  serial_t tmp_scb;

  last_serial_opened = NULL;

  if (serial_logfp)
    {
      fputs_unfiltered ("\nEnd of log\n", serial_logfp);
      serial_current_type = 0;

      /* XXX - What if serial_logfp == gdb_stdout or gdb_stderr? */
      gdb_fclose (&serial_logfp);
      serial_logfp = NULL;
    }

/* This is bogus.  It's not our fault if you pass us a bad scb...!  Rob, you
   should fix your code instead.  */

  if (!scb)
    return;

  scb->refcnt--;
  if (scb->refcnt > 0)
    return;

  /* ensure that the FD has been taken out of async mode */
  if (scb->async_handler != NULL)
    serial_async (scb, NULL, NULL);

  if (really_close)
    scb->ops->close (scb);

  if (scb->name)
    free (scb->name);

  if (scb_base == scb)
    scb_base = scb_base->next;
  else
    for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
      {
	if (tmp_scb->next != scb)
	  continue;

	tmp_scb->next = tmp_scb->next->next;
	break;
      }

  free (scb);
}

void
serial_close (serial_t scb)
{
  do_serial_close (scb, 1);
}

void
serial_un_fdopen (serial_t scb)
{
  do_serial_close (scb, 0);
}

int
serial_readchar (serial_t scb, int timeout)
{
  int ch;

  ch = scb->ops->readchar (scb, timeout);
  if (serial_logfp != NULL)
    {
      serial_logchar ('r', ch, timeout);

      /* Make sure that the log file is as up-to-date as possible,
         in case we are getting ready to dump core or something. */
      gdb_flush (serial_logfp);
    }

  return (ch);
}

int
serial_write (serial_t scb, const char *str, int len)
{
  if (serial_logfp != NULL)
    {
      int count;

      for (count = 0; count < len; count++)
	serial_logchar ('w', str[count] & 0xff, 0);

      /* Make sure that the log file is as up-to-date as possible,
         in case we are getting ready to dump core or something. */
      gdb_flush (serial_logfp);
    }

  return (scb->ops->write (scb, str, len));
}

void
serial_printf (serial_t desc, const char *format,...)
{
  va_list args;
  char *buf;
  va_start (args, format);

  vasprintf (&buf, format, args);
  SERIAL_WRITE (desc, buf, strlen (buf));

  free (buf);
  va_end (args);
}

int
serial_drain_output (serial_t scb)
{
  return scb->ops->drain_output (scb);
}

int
serial_flush_output (serial_t scb)
{
  return scb->ops->flush_output (scb);
}

int
serial_flush_input (serial_t scb)
{
  return scb->ops->flush_input (scb);
}

int
serial_send_break (serial_t scb)
{
  if (serial_logfp != NULL)
    serial_logchar ('w', SERIAL_BREAK, 0);

  return (scb->ops->send_break (scb));
}

void
serial_raw (serial_t scb)
{
  scb->ops->go_raw (scb);
}

serial_ttystate
serial_get_tty_state (serial_t scb)
{
  return scb->ops->get_tty_state (scb);
}

int
serial_set_tty_state (serial_t scb, serial_ttystate ttystate)
{
  return scb->ops->set_tty_state (scb, ttystate);
}

void
serial_print_tty_state (serial_t scb,
			serial_ttystate ttystate,
			struct gdb_file *stream)
{
  scb->ops->print_tty_state (scb, ttystate, stream);
}

int
serial_noflush_set_tty_state (serial_t scb,
			      serial_ttystate new_ttystate,
			      serial_ttystate old_ttystate)
{
  return scb->ops->noflush_set_tty_state (scb, new_ttystate, old_ttystate);
}

int
serial_setbaudrate (serial_t scb, int rate)
{
  return scb->ops->setbaudrate (scb, rate);
}

int
serial_setstopbits (serial_t scb, int num)
{
  return scb->ops->setstopbits (scb, num);
}

int
serial_can_async_p (serial_t scb)
{
  return (scb->ops->async != NULL);
}

int
serial_is_async_p (serial_t scb)
{
  return (scb->ops->async != NULL) && (scb->async_handler != NULL);
}

void
serial_async (serial_t scb,
	      serial_event_ftype *handler,
	      void *context)
{
  /* Only change mode if there is a need. */
  if ((scb->async_handler == NULL)
      != (handler == NULL))
    scb->ops->async (scb, handler != NULL);
  scb->async_handler = handler;
  scb->async_context = context;
}

int
deprecated_serial_fd (serial_t scb)
{
  /* FIXME: should this output a warning that deprecated code is being
     called? */
  if (scb->fd < 0)
    {
      internal_error ("serial: FD not valid");
    }
  return scb->fd; /* sigh */
}

#if 0
/*
   The connect command is #if 0 because I hadn't thought of an elegant
   way to wait for I/O on two serial_t's simultaneously.  Two solutions
   came to mind:

   1) Fork, and have have one fork handle the to user direction,
   and have the other hand the to target direction.  This
   obviously won't cut it for MSDOS.

   2) Use something like select.  This assumes that stdin and
   the target side can both be waited on via the same
   mechanism.  This may not be true for DOS, if GDB is
   talking to the target via a TCP socket.
   -grossman, 8 Jun 93
 */

/* Connect the user directly to the remote system.  This command acts just like
   the 'cu' or 'tip' command.  Use <CR>~. or <CR>~^D to break out.  */

static serial_t tty_desc;	/* Controlling terminal */

static void
cleanup_tty (serial_ttystate ttystate)
{
  printf_unfiltered ("\r\n[Exiting connect mode]\r\n");
  SERIAL_SET_TTY_STATE (tty_desc, ttystate);
  free (ttystate);
  SERIAL_CLOSE (tty_desc);
}

static void
connect_command (char *args, int fromtty)
{
  int c;
  char cur_esc = 0;
  serial_ttystate ttystate;
  serial_t port_desc;		/* TTY port */

  dont_repeat ();

  if (args)
    fprintf_unfiltered (gdb_stderr, "This command takes no args.  They have been ignored.\n");

  printf_unfiltered ("[Entering connect mode.  Use ~. or ~^D to escape]\n");

  tty_desc = SERIAL_FDOPEN (0);
  port_desc = last_serial_opened;

  ttystate = SERIAL_GET_TTY_STATE (tty_desc);

  SERIAL_RAW (tty_desc);
  SERIAL_RAW (port_desc);

  make_cleanup (cleanup_tty, ttystate);

  while (1)
    {
      int mask;

      mask = SERIAL_WAIT_2 (tty_desc, port_desc, -1);

      if (mask & 2)
	{			/* tty input */
	  char cx;

	  while (1)
	    {
	      c = SERIAL_READCHAR (tty_desc, 0);

	      if (c == SERIAL_TIMEOUT)
		break;

	      if (c < 0)
		perror_with_name ("connect");

	      cx = c;
	      SERIAL_WRITE (port_desc, &cx, 1);

	      switch (cur_esc)
		{
		case 0:
		  if (c == '\r')
		    cur_esc = c;
		  break;
		case '\r':
		  if (c == '~')
		    cur_esc = c;
		  else
		    cur_esc = 0;
		  break;
		case '~':
		  if (c == '.' || c == '\004')
		    return;
		  else
		    cur_esc = 0;
		}
	    }
	}

      if (mask & 1)
	{			/* Port input */
	  char cx;

	  while (1)
	    {
	      c = SERIAL_READCHAR (port_desc, 0);

	      if (c == SERIAL_TIMEOUT)
		break;

	      if (c < 0)
		perror_with_name ("connect");

	      cx = c;

	      SERIAL_WRITE (tty_desc, &cx, 1);
	    }
	}
    }
}
#endif /* 0 */

void
_initialize_serial (void)
{
#if 0
  add_com ("connect", class_obscure, connect_command,
	   "Connect the terminal directly up to the command monitor.\n\
Use <CR>~. or <CR>~^D to break out.");
#endif /* 0 */

  add_show_from_set
    (add_set_cmd ("remotelogfile", no_class,
		  var_filename, (char *) &serial_logfile,
		  "Set filename for remote session recording.\n\
This file is used to record the remote session for future playback\n\
by gdbserver.",
		  &setlist),
     &showlist);

  add_show_from_set
    (add_set_enum_cmd ("remotelogbase", no_class,
		       logbase_enums, (char *) &serial_logbase,
		       "Set numerical base for remote session logging",
		       &setlist),
     &showlist);
}