gdb/serial.c

   1 /* Generic serial interface routines
   2
   3    Copyright (C) 1992-2016 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include <ctype.h>
  22 #include "serial.h"
  23 #include "gdbcmd.h"
  24 #include "cli/cli-utils.h"
  25
  26 extern void _initialize_serial (void);
  27
  28 /* Is serial being debugged?  */
  29
  30 static unsigned int global_serial_debug_p;
  31
  32 typedef const struct serial_ops *serial_ops_p;
  33 DEF_VEC_P (serial_ops_p);
  34
  35 /* Serial I/O handlers.  */
  36
  37 VEC (serial_ops_p) *serial_ops_list = NULL;
  38
  39 /* Pointer to list of scb's.  */
  40
  41 static struct serial *scb_base;
  42
  43 /* Non-NULL gives filename which contains a recording of the remote session,
  44    suitable for playback by gdbserver.  */
  45
  46 static char *serial_logfile = NULL;
  47 static struct ui_file *serial_logfp = NULL;
  48
  49 static const struct serial_ops *serial_interface_lookup (const char *);
  50 static void serial_logchar (struct ui_file *stream,
  51                             int ch_type, int ch, int timeout);
  52 static const char logbase_hex[] = "hex";
  53 static const char logbase_octal[] = "octal";
  54 static const char logbase_ascii[] = "ascii";
  55 static const char *const logbase_enums[] =
  56 {logbase_hex, logbase_octal, logbase_ascii, NULL};
  57 static const char *serial_logbase = logbase_ascii;
  58 \f
  59
  60 static int serial_current_type = 0;
  61
  62 /* Log char CH of type CHTYPE, with TIMEOUT.  */
  63
  64 /* Define bogus char to represent a BREAK.  Should be careful to choose a value
  65    that can't be confused with a normal char, or an error code.  */
  66 #define SERIAL_BREAK 1235
  67
  68 static void
  69 serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
  70 {
  71   if (ch_type != serial_current_type)
  72     {
  73       fprintf_unfiltered (stream, "\n%c ", ch_type);
  74       serial_current_type = ch_type;
  75     }
  76
  77   if (serial_logbase != logbase_ascii)
  78     fputc_unfiltered (' ', stream);
  79
  80   switch (ch)
  81     {
  82     case SERIAL_TIMEOUT:
  83       fprintf_unfiltered (stream, "<Timeout: %d seconds>", timeout);
  84       return;
  85     case SERIAL_ERROR:
  86       fprintf_unfiltered (stream, "<Error: %s>", safe_strerror (errno));
  87       return;
  88     case SERIAL_EOF:
  89       fputs_unfiltered ("<Eof>", stream);
  90       return;
  91     case SERIAL_BREAK:
  92       fputs_unfiltered ("<Break>", stream);
  93       return;
  94     default:
  95       if (serial_logbase == logbase_hex)
  96         fprintf_unfiltered (stream, "%02x", ch & 0xff);
  97       else if (serial_logbase == logbase_octal)
  98         fprintf_unfiltered (stream, "%03o", ch & 0xff);
  99       else
 100         switch (ch)
 101           {
 102           case '\\':
 103             fputs_unfiltered ("\\\\", stream);
 104             break;
 105           case '\b':
 106             fputs_unfiltered ("\\b", stream);
 107             break;
 108           case '\f':
 109             fputs_unfiltered ("\\f", stream);
 110             break;
 111           case '\n':
 112             fputs_unfiltered ("\\n", stream);
 113             break;
 114           case '\r':
 115             fputs_unfiltered ("\\r", stream);
 116             break;
 117           case '\t':
 118             fputs_unfiltered ("\\t", stream);
 119             break;
 120           case '\v':
 121             fputs_unfiltered ("\\v", stream);
 122             break;
 123           default:
 124             fprintf_unfiltered (stream,
 125                                 isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
 126             break;
 127           }
 128     }
 129 }
 130
 131 void
 132 serial_log_command (struct target_ops *self, 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 \f
 148 static const struct serial_ops *
 149 serial_interface_lookup (const char *name)
 150 {
 151   const struct serial_ops *ops;
 152   int i;
 153
 154   for (i = 0; VEC_iterate (serial_ops_p, serial_ops_list, i, ops); ++i)
 155     if (strcmp (name, ops->name) == 0)
 156       return ops;
 157
 158   return NULL;
 159 }
 160
 161 void
 162 serial_add_interface (const struct serial_ops *optable)
 163 {
 164   VEC_safe_push (serial_ops_p, serial_ops_list, optable);
 165 }
 166
 167 /* Return the open serial device for FD, if found, or NULL if FD is
 168    not already opened.  */
 169
 170 struct serial *
 171 serial_for_fd (int fd)
 172 {
 173   struct serial *scb;
 174
 175   for (scb = scb_base; scb; scb = scb->next)
 176     if (scb->fd == fd)
 177       return scb;
 178
 179   return NULL;
 180 }
 181
 182 /* Create a new serial for OPS.  */
 183
 184 static struct serial *
 185 new_serial (const struct serial_ops *ops)
 186 {
 187   struct serial *scb;
 188
 189   scb = XCNEW (struct serial);
 190
 191   scb->ops = ops;
 192
 193   scb->bufp = scb->buf;
 194   scb->error_fd = -1;
 195   scb->refcnt = 1;
 196
 197   return scb;
 198 }
 199
 200 static struct serial *serial_open_ops_1 (const struct serial_ops *ops,
 201                                          const char *open_name);
 202
 203 /* Open up a device or a network socket, depending upon the syntax of NAME.  */
 204
 205 struct serial *
 206 serial_open (const char *name)
 207 {
 208   struct serial *scb;
 209   const struct serial_ops *ops;
 210   const char *open_name = name;
 211
 212   if (strcmp (name, "pc") == 0)
 213     ops = serial_interface_lookup ("pc");
 214   else if (startswith (name, "lpt"))
 215     ops = serial_interface_lookup ("parallel");
 216   else if (startswith (name, "|"))
 217     {
 218       ops = serial_interface_lookup ("pipe");
 219       /* Discard ``|'' and any space before the command itself.  */
 220       ++open_name;
 221       open_name = skip_spaces_const (open_name);
 222     }
 223   /* Check for a colon, suggesting an IP address/port pair.
 224      Do this *after* checking for all the interesting prefixes.  We
 225      don't want to constrain the syntax of what can follow them.  */
 226   else if (strchr (name, ':'))
 227     ops = serial_interface_lookup ("tcp");
 228   else
 229     ops = serial_interface_lookup ("hardwire");
 230
 231   if (!ops)
 232     return NULL;
 233
 234   return serial_open_ops_1 (ops, open_name);
 235 }
 236
 237 /* Open up a serial for OPS, passing OPEN_NAME to the open method.  */
 238
 239 static struct serial *
 240 serial_open_ops_1 (const struct serial_ops *ops, const char *open_name)
 241 {
 242   struct serial *scb;
 243
 244   scb = new_serial (ops);
 245
 246   /* `...->open (...)' would get expanded by the open(2) syscall macro.  */
 247   if ((*scb->ops->open) (scb, open_name))
 248     {
 249       xfree (scb);
 250       return NULL;
 251     }
 252
 253   scb->next = scb_base;
 254   scb_base = scb;
 255
 256   if (serial_logfile != NULL)
 257     {
 258       serial_logfp = gdb_fopen (serial_logfile, "w");
 259       if (serial_logfp == NULL)
 260         perror_with_name (serial_logfile);
 261     }
 262
 263   return scb;
 264 }
 265
 266 /* See serial.h.  */
 267
 268 struct serial *
 269 serial_open_ops (const struct serial_ops *ops)
 270 {
 271   return serial_open_ops_1 (ops, NULL);
 272 }
 273
 274 /* Open a new serial stream using a file handle, using serial
 275    interface ops OPS.  */
 276
 277 static struct serial *
 278 serial_fdopen_ops (const int fd, const struct serial_ops *ops)
 279 {
 280   struct serial *scb;
 281
 282   if (!ops)
 283     {
 284       ops = serial_interface_lookup ("terminal");
 285       if (!ops)
 286         ops = serial_interface_lookup ("hardwire");
 287     }
 288
 289   if (!ops)
 290     return NULL;
 291
 292   scb = new_serial (ops);
 293
 294   scb->next = scb_base;
 295   scb_base = scb;
 296
 297   if ((ops->fdopen) != NULL)
 298     (*ops->fdopen) (scb, fd);
 299   else
 300     scb->fd = fd;
 301
 302   return scb;
 303 }
 304
 305 struct serial *
 306 serial_fdopen (const int fd)
 307 {
 308   return serial_fdopen_ops (fd, NULL);
 309 }
 310
 311 static void
 312 do_serial_close (struct serial *scb, int really_close)
 313 {
 314   struct serial *tmp_scb;
 315
 316   if (serial_logfp)
 317     {
 318       fputs_unfiltered ("\nEnd of log\n", serial_logfp);
 319       serial_current_type = 0;
 320
 321       /* XXX - What if serial_logfp == gdb_stdout or gdb_stderr?  */
 322       ui_file_delete (serial_logfp);
 323       serial_logfp = NULL;
 324     }
 325
 326   /* ensure that the FD has been taken out of async mode.  */
 327   if (scb->async_handler != NULL)
 328     serial_async (scb, NULL, NULL);
 329
 330   if (really_close)
 331     scb->ops->close (scb);
 332
 333   /* For serial_is_open.  */
 334   scb->bufp = NULL;
 335
 336   if (scb_base == scb)
 337     scb_base = scb_base->next;
 338   else
 339     for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
 340       {
 341         if (tmp_scb->next != scb)
 342           continue;
 343
 344         tmp_scb->next = tmp_scb->next->next;
 345         break;
 346       }
 347
 348   serial_unref (scb);
 349 }
 350
 351 void
 352 serial_close (struct serial *scb)
 353 {
 354   do_serial_close (scb, 1);
 355 }
 356
 357 void
 358 serial_un_fdopen (struct serial *scb)
 359 {
 360   do_serial_close (scb, 0);
 361 }
 362
 363 int
 364 serial_is_open (struct serial *scb)
 365 {
 366   return scb->bufp != NULL;
 367 }
 368
 369 void
 370 serial_ref (struct serial *scb)
 371 {
 372   scb->refcnt++;
 373 }
 374
 375 void
 376 serial_unref (struct serial *scb)
 377 {
 378   --scb->refcnt;
 379   if (scb->refcnt == 0)
 380     xfree (scb);
 381 }
 382
 383 int
 384 serial_readchar (struct serial *scb, int timeout)
 385 {
 386   int ch;
 387
 388   /* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
 389      code is finished.  */
 390   if (0 && serial_is_async_p (scb) && timeout < 0)
 391     internal_error (__FILE__, __LINE__,
 392                     _("serial_readchar: blocking read in async mode"));
 393
 394   ch = scb->ops->readchar (scb, timeout);
 395   if (serial_logfp != NULL)
 396     {
 397       serial_logchar (serial_logfp, 'r', ch, timeout);
 398
 399       /* Make sure that the log file is as up-to-date as possible,
 400          in case we are getting ready to dump core or something.  */
 401       gdb_flush (serial_logfp);
 402     }
 403   if (serial_debug_p (scb))
 404     {
 405       fprintf_unfiltered (gdb_stdlog, "[");
 406       serial_logchar (gdb_stdlog, 'r', ch, timeout);
 407       fprintf_unfiltered (gdb_stdlog, "]");
 408       gdb_flush (gdb_stdlog);
 409     }
 410
 411   return (ch);
 412 }
 413
 414 int
 415 serial_write (struct serial *scb, const void *buf, size_t count)
 416 {
 417   if (serial_logfp != NULL)
 418     {
 419       const char *str = (const char *) buf;
 420       size_t c;
 421
 422       for (c = 0; c < count; c++)
 423         serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
 424
 425       /* Make sure that the log file is as up-to-date as possible,
 426          in case we are getting ready to dump core or something.  */
 427       gdb_flush (serial_logfp);
 428     }
 429   if (serial_debug_p (scb))
 430     {
 431       const char *str = (const char *) buf;
 432       size_t c;
 433
 434       for (c = 0; c < count; c++)
 435         {
 436           fprintf_unfiltered (gdb_stdlog, "[");
 437           serial_logchar (gdb_stdlog, 'w', str[c] & 0xff, 0);
 438           fprintf_unfiltered (gdb_stdlog, "]");
 439         }
 440       gdb_flush (gdb_stdlog);
 441     }
 442
 443   return (scb->ops->write (scb, buf, count));
 444 }
 445
 446 void
 447 serial_printf (struct serial *desc, const char *format,...)
 448 {
 449   va_list args;
 450   char *buf;
 451   va_start (args, format);
 452
 453   buf = xstrvprintf (format, args);
 454   serial_write (desc, buf, strlen (buf));
 455
 456   xfree (buf);
 457   va_end (args);
 458 }
 459
 460 int
 461 serial_drain_output (struct serial *scb)
 462 {
 463   return scb->ops->drain_output (scb);
 464 }
 465
 466 int
 467 serial_flush_output (struct serial *scb)
 468 {
 469   return scb->ops->flush_output (scb);
 470 }
 471
 472 int
 473 serial_flush_input (struct serial *scb)
 474 {
 475   return scb->ops->flush_input (scb);
 476 }
 477
 478 int
 479 serial_send_break (struct serial *scb)
 480 {
 481   if (serial_logfp != NULL)
 482     serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
 483
 484   return (scb->ops->send_break (scb));
 485 }
 486
 487 void
 488 serial_raw (struct serial *scb)
 489 {
 490   scb->ops->go_raw (scb);
 491 }
 492
 493 serial_ttystate
 494 serial_get_tty_state (struct serial *scb)
 495 {
 496   return scb->ops->get_tty_state (scb);
 497 }
 498
 499 serial_ttystate
 500 serial_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
 501 {
 502   return scb->ops->copy_tty_state (scb, ttystate);
 503 }
 504
 505 int
 506 serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
 507 {
 508   return scb->ops->set_tty_state (scb, ttystate);
 509 }
 510
 511 void
 512 serial_print_tty_state (struct serial *scb,
 513                         serial_ttystate ttystate,
 514                         struct ui_file *stream)
 515 {
 516   scb->ops->print_tty_state (scb, ttystate, stream);
 517 }
 518
 519 int
 520 serial_noflush_set_tty_state (struct serial *scb,
 521                               serial_ttystate new_ttystate,
 522                               serial_ttystate old_ttystate)
 523 {
 524   return scb->ops->noflush_set_tty_state (scb, new_ttystate, old_ttystate);
 525 }
 526
 527 int
 528 serial_setbaudrate (struct serial *scb, int rate)
 529 {
 530   return scb->ops->setbaudrate (scb, rate);
 531 }
 532
 533 int
 534 serial_setstopbits (struct serial *scb, int num)
 535 {
 536   return scb->ops->setstopbits (scb, num);
 537 }
 538
 539 /* See serial.h.  */
 540
 541 int
 542 serial_setparity (struct serial *scb, int parity)
 543 {
 544   return scb->ops->setparity (scb, parity);
 545 }
 546
 547 int
 548 serial_can_async_p (struct serial *scb)
 549 {
 550   return (scb->ops->async != NULL);
 551 }
 552
 553 int
 554 serial_is_async_p (struct serial *scb)
 555 {
 556   return (scb->ops->async != NULL) && (scb->async_handler != NULL);
 557 }
 558
 559 void
 560 serial_async (struct serial *scb,
 561               serial_event_ftype *handler,
 562               void *context)
 563 {
 564   int changed = ((scb->async_handler == NULL) != (handler == NULL));
 565
 566   scb->async_handler = handler;
 567   scb->async_context = context;
 568   /* Only change mode if there is a need.  */
 569   if (changed)
 570     scb->ops->async (scb, handler != NULL);
 571 }
 572
 573 void
 574 serial_debug (struct serial *scb, int debug_p)
 575 {
 576   scb->debug_p = debug_p;
 577 }
 578
 579 int
 580 serial_debug_p (struct serial *scb)
 581 {
 582   return scb->debug_p || global_serial_debug_p;
 583 }
 584
 585 #ifdef USE_WIN32API
 586 void
 587 serial_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
 588 {
 589   if (scb->ops->wait_handle)
 590     scb->ops->wait_handle (scb, read, except);
 591   else
 592     {
 593       *read = (HANDLE) _get_osfhandle (scb->fd);
 594       *except = NULL;
 595     }
 596 }
 597
 598 void
 599 serial_done_wait_handle (struct serial *scb)
 600 {
 601   if (scb->ops->done_wait_handle)
 602     scb->ops->done_wait_handle (scb);
 603 }
 604 #endif
 605
 606 int
 607 serial_pipe (struct serial *scbs[2])
 608 {
 609   const struct serial_ops *ops;
 610   int fildes[2];
 611
 612   ops = serial_interface_lookup ("pipe");
 613   if (!ops)
 614     {
 615       errno = ENOSYS;
 616       return -1;
 617     }
 618
 619   if (gdb_pipe (fildes) == -1)
 620     return -1;
 621
 622   scbs[0] = serial_fdopen_ops (fildes[0], ops);
 623   scbs[1] = serial_fdopen_ops (fildes[1], ops);
 624   return 0;
 625 }
 626
 627 /* Serial set/show framework.  */
 628
 629 static struct cmd_list_element *serial_set_cmdlist;
 630 static struct cmd_list_element *serial_show_cmdlist;
 631
 632 static void
 633 serial_set_cmd (char *args, int from_tty)
 634 {
 635   printf_unfiltered ("\"set serial\" must be followed "
 636                      "by the name of a command.\n");
 637   help_list (serial_set_cmdlist, "set serial ", all_commands, gdb_stdout);
 638 }
 639
 640 static void
 641 serial_show_cmd (char *args, int from_tty)
 642 {
 643   cmd_show_list (serial_show_cmdlist, from_tty, "");
 644 }
 645
 646 /* Baud rate specified for talking to serial target systems.  Default
 647    is left as -1, so targets can choose their own defaults.  */
 648 /* FIXME: This means that "show serial baud" and gr_files_info can
 649    print -1 or (unsigned int)-1.  This is a Bad User Interface.  */
 650
 651 int baud_rate = -1;
 652
 653 static void
 654 serial_baud_show_cmd (struct ui_file *file, int from_tty,
 655                       struct cmd_list_element *c, const char *value)
 656 {
 657   fprintf_filtered (file, _("Baud rate for remote serial I/O is %s.\n"),
 658                     value);
 659 }
 660
 661 /* Parity for serial port.  */
 662
 663 int serial_parity = GDBPARITY_NONE;
 664
 665 static const char parity_none[] = "none";
 666 static const char parity_odd[] = "odd";
 667 static const char parity_even[] = "even";
 668 static const char *const parity_enums[] =
 669   {parity_none, parity_odd, parity_even,  NULL};
 670 static const char *parity = parity_none;
 671
 672 /* Set serial_parity value.  */
 673
 674 static void
 675 set_parity (char *ignore_args, int from_tty, struct cmd_list_element *c)
 676 {
 677   if (parity == parity_odd)
 678     serial_parity = GDBPARITY_ODD;
 679   else if (parity == parity_even)
 680     serial_parity = GDBPARITY_EVEN;
 681   else
 682     serial_parity = GDBPARITY_NONE;
 683 }
 684
 685 void
 686 _initialize_serial (void)
 687 {
 688 #if 0
 689   add_com ("connect", class_obscure, connect_command, _("\
 690 Connect the terminal directly up to the command monitor.\n\
 691 Use <CR>~. or <CR>~^D to break out."));
 692 #endif /* 0 */
 693
 694   add_prefix_cmd ("serial", class_maintenance, serial_set_cmd, _("\
 695 Set default serial/parallel port configuration."),
 696                   &serial_set_cmdlist, "set serial ",
 697                   0/*allow-unknown*/,
 698                   &setlist);
 699
 700   add_prefix_cmd ("serial", class_maintenance, serial_show_cmd, _("\
 701 Show default serial/parallel port configuration."),
 702                   &serial_show_cmdlist, "show serial ",
 703                   0/*allow-unknown*/,
 704                   &showlist);
 705
 706   /* If target is open when baud changes, it doesn't take effect until
 707      the next open (I think, not sure).  */
 708   add_setshow_zinteger_cmd ("baud", no_class, &baud_rate, _("\
 709 Set baud rate for remote serial I/O."), _("\
 710 Show baud rate for remote serial I/O."), _("\
 711 This value is used to set the speed of the serial port when debugging\n\
 712 using remote targets."),
 713                             NULL,
 714                             serial_baud_show_cmd,
 715                             &serial_set_cmdlist, &serial_show_cmdlist);
 716
 717   add_setshow_enum_cmd ("parity", no_class, parity_enums,
 718                         &parity, _("\
 719 Set parity for remote serial I/O"), _("\
 720 Show parity for remote serial I/O"), NULL,
 721                         set_parity,
 722                         NULL, /* FIXME: i18n: */
 723                         &serial_set_cmdlist, &serial_show_cmdlist);
 724
 725   add_setshow_filename_cmd ("remotelogfile", no_class, &serial_logfile, _("\
 726 Set filename for remote session recording."), _("\
 727 Show filename for remote session recording."), _("\
 728 This file is used to record the remote session for future playback\n\
 729 by gdbserver."),
 730                             NULL,
 731                             NULL, /* FIXME: i18n: */
 732                             &setlist, &showlist);
 733
 734   add_setshow_enum_cmd ("remotelogbase", no_class, logbase_enums,
 735                         &serial_logbase, _("\
 736 Set numerical base for remote session logging"), _("\
 737 Show numerical base for remote session logging"), NULL,
 738                         NULL,
 739                         NULL, /* FIXME: i18n: */
 740                         &setlist, &showlist);
 741
 742   add_setshow_zuinteger_cmd ("serial", class_maintenance,
 743                              &global_serial_debug_p, _("\
 744 Set serial debugging."), _("\
 745 Show serial debugging."), _("\
 746 When non-zero, serial port debugging is enabled."),
 747                              NULL,
 748                              NULL, /* FIXME: i18n: */
 749                              &setdebuglist, &showdebuglist);
 750 }