gdb/serial.c

   1 /* Generic serial interface routines
   2    Copyright 1992, 1993, 1996, 1997 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include <ctype.h>
  23 #include "serial.h"
  24 #include "gdb_string.h"
  25 #include "gdbcmd.h"
  26
  27 extern void _initialize_serial PARAMS ((void));
  28
  29 /* Linked list of serial I/O handlers */
  30
  31 static struct serial_ops *serial_ops_list = NULL;
  32
  33 /* This is the last serial stream opened.  Used by connect command. */
  34
  35 static serial_t last_serial_opened = NULL;
  36
  37 /* Pointer to list of scb's. */
  38
  39 static serial_t scb_base;
  40
  41 /* Non-NULL gives filename which contains a recording of the remote session,
  42    suitable for playback by gdbserver. */
  43
  44 static char *serial_logfile = NULL;
  45 static GDB_FILE *serial_logfp = NULL;
  46
  47 static struct serial_ops *serial_interface_lookup PARAMS ((char *));
  48 static void serial_logchar PARAMS ((int, int, int));
  49 static char logbase_hex[] = "hex";
  50 static char logbase_octal[] = "octal";
  51 static char logbase_ascii[] = "ascii";
  52 static char *logbase_enums[] =
  53 {logbase_hex, logbase_octal, logbase_ascii, NULL};
  54 static char *serial_logbase = logbase_ascii;
  55 \f
  56
  57 static int serial_current_type = 0;
  58
  59 /* Log char CH of type CHTYPE, with TIMEOUT */
  60
  61 /* Define bogus char to represent a BREAK.  Should be careful to choose a value
  62    that can't be confused with a normal char, or an error code.  */
  63 #define SERIAL_BREAK 1235
  64
  65 static void
  66 serial_logchar (ch_type, ch, timeout)
  67      int ch_type;
  68      int ch;
  69      int timeout;
  70 {
  71   if (ch_type != serial_current_type)
  72     {
  73       fprintf_unfiltered (serial_logfp, "\n%c ", ch_type);
  74       serial_current_type = ch_type;
  75     }
  76
  77   if (serial_logbase != logbase_ascii)
  78     fputc_unfiltered (' ', serial_logfp);
  79
  80   switch (ch)
  81     {
  82     case SERIAL_TIMEOUT:
  83       fprintf_unfiltered (serial_logfp, "<Timeout: %d seconds>", timeout);
  84       return;
  85     case SERIAL_ERROR:
  86       fprintf_unfiltered (serial_logfp, "<Error: %s>", safe_strerror (errno));
  87       return;
  88     case SERIAL_EOF:
  89       fputs_unfiltered ("<Eof>", serial_logfp);
  90       return;
  91     case SERIAL_BREAK:
  92       fputs_unfiltered ("<Break>", serial_logfp);
  93       return;
  94     default:
  95       if (serial_logbase == logbase_hex)
  96         fprintf_unfiltered (serial_logfp, "%02x", ch & 0xff);
  97       else if (serial_logbase == logbase_octal)
  98         fprintf_unfiltered (serial_logfp, "%03o", ch & 0xff);
  99       else
 100         switch (ch)
 101           {
 102           case '\\':
 103             fputs_unfiltered ("\\\\", serial_logfp);
 104             break;
 105           case '\b':
 106             fputs_unfiltered ("\\b", serial_logfp);
 107             break;
 108           case '\f':
 109             fputs_unfiltered ("\\f", serial_logfp);
 110             break;
 111           case '\n':
 112             fputs_unfiltered ("\\n", serial_logfp);
 113             break;
 114           case '\r':
 115             fputs_unfiltered ("\\r", serial_logfp);
 116             break;
 117           case '\t':
 118             fputs_unfiltered ("\\t", serial_logfp);
 119             break;
 120           case '\v':
 121             fputs_unfiltered ("\\v", serial_logfp);
 122             break;
 123           default:
 124             fprintf_unfiltered (serial_logfp, isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
 125             break;
 126           }
 127     }
 128 }
 129
 130 void
 131 serial_log_command (cmd)
 132      const char *cmd;
 133 {
 134   if (!serial_logfp)
 135     return;
 136
 137   serial_current_type = 'c';
 138
 139   fputs_unfiltered ("\nc ", serial_logfp);
 140   fputs_unfiltered (cmd, serial_logfp);
 141
 142   /* Make sure that the log file is as up-to-date as possible,
 143      in case we are getting ready to dump core or something. */
 144   gdb_flush (serial_logfp);
 145 }
 146
 147 int
 148 serial_write (scb, str, len)
 149      serial_t scb;
 150      const char *str;
 151      int len;
 152 {
 153   if (serial_logfp != NULL)
 154     {
 155       int count;
 156
 157       for (count = 0; count < len; count++)
 158         serial_logchar ('w', str[count] & 0xff, 0);
 159
 160       /* Make sure that the log file is as up-to-date as possible,
 161          in case we are getting ready to dump core or something. */
 162       gdb_flush (serial_logfp);
 163     }
 164
 165   return (scb->ops->write (scb, str, len));
 166 }
 167
 168 int
 169 serial_readchar (scb, timeout)
 170      serial_t scb;
 171      int timeout;
 172 {
 173   int ch;
 174
 175   ch = scb->ops->readchar (scb, timeout);
 176   if (serial_logfp != NULL)
 177     {
 178       serial_logchar ('r', ch, timeout);
 179
 180       /* Make sure that the log file is as up-to-date as possible,
 181          in case we are getting ready to dump core or something. */
 182       gdb_flush (serial_logfp);
 183     }
 184
 185   return (ch);
 186 }
 187
 188 int
 189 serial_send_break (scb)
 190      serial_t scb;
 191 {
 192   if (serial_logfp != NULL)
 193     serial_logchar ('w', SERIAL_BREAK, 0);
 194
 195   return (scb->ops->send_break (scb));
 196 }
 197
 198 static struct serial_ops *
 199 serial_interface_lookup (name)
 200      char *name;
 201 {
 202   struct serial_ops *ops;
 203
 204   for (ops = serial_ops_list; ops; ops = ops->next)
 205     if (strcmp (name, ops->name) == 0)
 206       return ops;
 207
 208   return NULL;
 209 }
 210
 211 void
 212 serial_add_interface (optable)
 213      struct serial_ops *optable;
 214 {
 215   optable->next = serial_ops_list;
 216   serial_ops_list = optable;
 217 }
 218
 219 /* Open up a device or a network socket, depending upon the syntax of NAME. */
 220
 221 serial_t
 222 serial_open (name)
 223      const char *name;
 224 {
 225   serial_t scb;
 226   struct serial_ops *ops;
 227
 228   for (scb = scb_base; scb; scb = scb->next)
 229     if (scb->name && strcmp (scb->name, name) == 0)
 230       {
 231         scb->refcnt++;
 232         return scb;
 233       }
 234
 235   if (strcmp (name, "ocd") == 0)
 236     ops = serial_interface_lookup ("ocd");
 237   else if (strcmp (name, "pc") == 0)
 238     ops = serial_interface_lookup ("pc");
 239   else if (strchr (name, ':'))
 240     ops = serial_interface_lookup ("tcp");
 241   else if (strncmp (name, "lpt", 3) == 0)
 242     ops = serial_interface_lookup ("parallel");
 243   else if (strncmp (name, "|", 1) == 0)
 244     ops = serial_interface_lookup ("pipe");
 245   else
 246     ops = serial_interface_lookup ("hardwire");
 247
 248   if (!ops)
 249     return NULL;
 250
 251   scb = (serial_t) xmalloc (sizeof (struct _serial_t));
 252
 253   scb->ops = ops;
 254
 255   scb->bufcnt = 0;
 256   scb->bufp = scb->buf;
 257
 258   if (scb->ops->open (scb, name))
 259     {
 260       free (scb);
 261       return NULL;
 262     }
 263
 264   scb->name = strsave (name);
 265   scb->next = scb_base;
 266   scb->refcnt = 1;
 267   scb_base = scb;
 268
 269   last_serial_opened = scb;
 270
 271   if (serial_logfile != NULL)
 272     {
 273       serial_logfp = gdb_fopen (serial_logfile, "w");
 274       if (serial_logfp == NULL)
 275         perror_with_name (serial_logfile);
 276     }
 277
 278   return scb;
 279 }
 280
 281 serial_t
 282 serial_fdopen (fd)
 283      const int fd;
 284 {
 285   serial_t scb;
 286   struct serial_ops *ops;
 287
 288   for (scb = scb_base; scb; scb = scb->next)
 289     if (scb->fd == fd)
 290       {
 291         scb->refcnt++;
 292         return scb;
 293       }
 294
 295   ops = serial_interface_lookup ("hardwire");
 296
 297   if (!ops)
 298     return NULL;
 299
 300   scb = (serial_t) xmalloc (sizeof (struct _serial_t));
 301
 302   scb->ops = ops;
 303
 304   scb->bufcnt = 0;
 305   scb->bufp = scb->buf;
 306
 307   scb->fd = fd;
 308
 309   scb->name = NULL;
 310   scb->next = scb_base;
 311   scb->refcnt = 1;
 312   scb_base = scb;
 313
 314   last_serial_opened = scb;
 315
 316   return scb;
 317 }
 318
 319 void
 320 serial_close (scb, really_close)
 321      serial_t scb;
 322      int really_close;
 323 {
 324   serial_t tmp_scb;
 325
 326   last_serial_opened = NULL;
 327
 328   if (serial_logfp)
 329     {
 330       fputs_unfiltered ("\nEnd of log\n", serial_logfp);
 331       serial_current_type = 0;
 332
 333       /* XXX - What if serial_logfp == gdb_stdout or gdb_stderr? */
 334       gdb_fclose (&serial_logfp);
 335       serial_logfp = NULL;
 336     }
 337
 338 /* This is bogus.  It's not our fault if you pass us a bad scb...!  Rob, you
 339    should fix your code instead.  */
 340
 341   if (!scb)
 342     return;
 343
 344   scb->refcnt--;
 345   if (scb->refcnt > 0)
 346     return;
 347
 348   if (really_close)
 349     scb->ops->close (scb);
 350
 351   if (scb->name)
 352     free (scb->name);
 353
 354   if (scb_base == scb)
 355     scb_base = scb_base->next;
 356   else
 357     for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
 358       {
 359         if (tmp_scb->next != scb)
 360           continue;
 361
 362         tmp_scb->next = tmp_scb->next->next;
 363         break;
 364       }
 365
 366   free (scb);
 367 }
 368
 369 #if 0
 370 /*
 371    The connect command is #if 0 because I hadn't thought of an elegant
 372    way to wait for I/O on two serial_t's simultaneously.  Two solutions
 373    came to mind:
 374
 375    1) Fork, and have have one fork handle the to user direction,
 376    and have the other hand the to target direction.  This
 377    obviously won't cut it for MSDOS.
 378
 379    2) Use something like select.  This assumes that stdin and
 380    the target side can both be waited on via the same
 381    mechanism.  This may not be true for DOS, if GDB is
 382    talking to the target via a TCP socket.
 383    -grossman, 8 Jun 93
 384  */
 385
 386 /* Connect the user directly to the remote system.  This command acts just like
 387    the 'cu' or 'tip' command.  Use <CR>~. or <CR>~^D to break out.  */
 388
 389 static serial_t tty_desc;       /* Controlling terminal */
 390
 391 static void
 392 cleanup_tty (ttystate)
 393      serial_ttystate ttystate;
 394 {
 395   printf_unfiltered ("\r\n[Exiting connect mode]\r\n");
 396   SERIAL_SET_TTY_STATE (tty_desc, ttystate);
 397   free (ttystate);
 398   SERIAL_CLOSE (tty_desc);
 399 }
 400
 401 static void
 402 connect_command (args, fromtty)
 403      char *args;
 404      int fromtty;
 405 {
 406   int c;
 407   char cur_esc = 0;
 408   serial_ttystate ttystate;
 409   serial_t port_desc;           /* TTY port */
 410
 411   dont_repeat ();
 412
 413   if (args)
 414     fprintf_unfiltered (gdb_stderr, "This command takes no args.  They have been ignored.\n");
 415
 416   printf_unfiltered ("[Entering connect mode.  Use ~. or ~^D to escape]\n");
 417
 418   tty_desc = SERIAL_FDOPEN (0);
 419   port_desc = last_serial_opened;
 420
 421   ttystate = SERIAL_GET_TTY_STATE (tty_desc);
 422
 423   SERIAL_RAW (tty_desc);
 424   SERIAL_RAW (port_desc);
 425
 426   make_cleanup (cleanup_tty, ttystate);
 427
 428   while (1)
 429     {
 430       int mask;
 431
 432       mask = SERIAL_WAIT_2 (tty_desc, port_desc, -1);
 433
 434       if (mask & 2)
 435         {                       /* tty input */
 436           char cx;
 437
 438           while (1)
 439             {
 440               c = SERIAL_READCHAR (tty_desc, 0);
 441
 442               if (c == SERIAL_TIMEOUT)
 443                 break;
 444
 445               if (c < 0)
 446                 perror_with_name ("connect");
 447
 448               cx = c;
 449               SERIAL_WRITE (port_desc, &cx, 1);
 450
 451               switch (cur_esc)
 452                 {
 453                 case 0:
 454                   if (c == '\r')
 455                     cur_esc = c;
 456                   break;
 457                 case '\r':
 458                   if (c == '~')
 459                     cur_esc = c;
 460                   else
 461                     cur_esc = 0;
 462                   break;
 463                 case '~':
 464                   if (c == '.' || c == '\004')
 465                     return;
 466                   else
 467                     cur_esc = 0;
 468                 }
 469             }
 470         }
 471
 472       if (mask & 1)
 473         {                       /* Port input */
 474           char cx;
 475
 476           while (1)
 477             {
 478               c = SERIAL_READCHAR (port_desc, 0);
 479
 480               if (c == SERIAL_TIMEOUT)
 481                 break;
 482
 483               if (c < 0)
 484                 perror_with_name ("connect");
 485
 486               cx = c;
 487
 488               SERIAL_WRITE (tty_desc, &cx, 1);
 489             }
 490         }
 491     }
 492 }
 493 #endif /* 0 */
 494
 495 void
 496 serial_printf (serial_t desc, const char *format,...)
 497 {
 498   va_list args;
 499   char *buf;
 500   va_start (args, format);
 501
 502   vasprintf (&buf, format, args);
 503   SERIAL_WRITE (desc, buf, strlen (buf));
 504
 505   free (buf);
 506   va_end (args);
 507 }
 508
 509 void
 510 _initialize_serial ()
 511 {
 512 #if 0
 513   add_com ("connect", class_obscure, connect_command,
 514            "Connect the terminal directly up to the command monitor.\n\
 515 Use <CR>~. or <CR>~^D to break out.");
 516 #endif /* 0 */
 517
 518   add_show_from_set
 519     (add_set_cmd ("remotelogfile", no_class,
 520                   var_filename, (char *) &serial_logfile,
 521                   "Set filename for remote session recording.\n\
 522 This file is used to record the remote session for future playback\n\
 523 by gdbserver.",
 524                   &setlist),
 525      &showlist);
 526
 527   add_show_from_set
 528     (add_set_enum_cmd ("remotelogbase", no_class,
 529                        logbase_enums, (char *) &serial_logbase,
 530                        "Set numerical base for remote session logging",
 531                        &setlist),
 532      &showlist);
 533 }