gdb/serial.c

   1 /* Generic serial interface routines
   2
   3    Copyright (C) 1992-2017 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 /* Is serial being debugged?  */
  27
  28 static unsigned int global_serial_debug_p;
  29
  30 typedef const struct serial_ops *serial_ops_p;
  31 DEF_VEC_P (serial_ops_p);
  32
  33 /* Serial I/O handlers.  */
  34
  35 VEC (serial_ops_p) *serial_ops_list = NULL;
  36
  37 /* Pointer to list of scb's.  */
  38
  39 static struct serial *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 struct ui_file *serial_logfp = NULL;
  46
  47 static const struct serial_ops *serial_interface_lookup (const char *);
  48 static void serial_logchar (struct ui_file *stream,
  49                             int ch_type, int ch, int timeout);
  50 static const char logbase_hex[] = "hex";
  51 static const char logbase_octal[] = "octal";
  52 static const char logbase_ascii[] = "ascii";
  53 static const char *const logbase_enums[] =
  54 {logbase_hex, logbase_octal, logbase_ascii, NULL};
  55 static const char *serial_logbase = logbase_ascii;
  56 \f
  57
  58 static int serial_current_type = 0;
  59
  60 /* Log char CH of type CHTYPE, with TIMEOUT.  */
  61
  62 /* Define bogus char to represent a BREAK.  Should be careful to choose a value
  63    that can't be confused with a normal char, or an error code.  */
  64 #define SERIAL_BREAK 1235
  65
  66 static void
  67 serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
  68 {
  69   if (ch_type != serial_current_type)
  70     {
  71       fprintf_unfiltered (stream, "\n%c ", ch_type);
  72       serial_current_type = ch_type;
  73     }
  74
  75   if (serial_logbase != logbase_ascii)
  76     fputc_unfiltered (' ', stream);
  77
  78   switch (ch)
  79     {
  80     case SERIAL_TIMEOUT:
  81       fprintf_unfiltered (stream, "<Timeout: %d seconds>", timeout);
  82       return;
  83     case SERIAL_ERROR:
  84       fprintf_unfiltered (stream, "<Error: %s>", safe_strerror (errno));
  85       return;
  86     case SERIAL_EOF:
  87       fputs_unfiltered ("<Eof>", stream);
  88       return;
  89     case SERIAL_BREAK:
  90       fputs_unfiltered ("<Break>", stream);
  91       return;
  92     default:
  93       if (serial_logbase == logbase_hex)
  94         fprintf_unfiltered (stream, "%02x", ch & 0xff);
  95       else if (serial_logbase == logbase_octal)
  96         fprintf_unfiltered (stream, "%03o", ch & 0xff);
  97       else
  98         switch (ch)
  99           {
 100           case '\\':
 101             fputs_unfiltered ("\\\\", stream);
 102             break;
 103           case '\b':
 104             fputs_unfiltered ("\\b", stream);
 105             break;
 106           case '\f':
 107             fputs_unfiltered ("\\f", stream);
 108             break;
 109           case '\n':
 110             fputs_unfiltered ("\\n", stream);
 111             break;
 112           case '\r':
 113             fputs_unfiltered ("\\r", stream);
 114             break;
 115           case '\t':
 116             fputs_unfiltered ("\\t", stream);
 117             break;
 118           case '\v':
 119             fputs_unfiltered ("\\v", stream);
 120             break;
 121           default:
 122             fprintf_unfiltered (stream,
 123                                 isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
 124             break;
 125           }
 126     }
 127 }
 128
 129 void
 130 serial_log_command (struct target_ops *self, const char *cmd)
 131 {
 132   if (!serial_logfp)
 133     return;
 134
 135   serial_current_type = 'c';
 136
 137   fputs_unfiltered ("\nc ", serial_logfp);
 138   fputs_unfiltered (cmd, serial_logfp);
 139
 140   /* Make sure that the log file is as up-to-date as possible,
 141      in case we are getting ready to dump core or something.  */
 142   gdb_flush (serial_logfp);
 143 }
 144
 145 \f
 146 static const struct serial_ops *
 147 serial_interface_lookup (const char *name)
 148 {
 149   const struct serial_ops *ops;
 150   int i;
 151
 152   for (i = 0; VEC_iterate (serial_ops_p, serial_ops_list, i, ops); ++i)
 153     if (strcmp (name, ops->name) == 0)
 154       return ops;
 155
 156   return NULL;
 157 }
 158
 159 void
 160 serial_add_interface (const struct serial_ops *optable)
 161 {
 162   VEC_safe_push (serial_ops_p, serial_ops_list, optable);
 163 }
 164
 165 /* Return the open serial device for FD, if found, or NULL if FD is
 166    not already opened.  */
 167
 168 struct serial *
 169 serial_for_fd (int fd)
 170 {
 171   struct serial *scb;
 172
 173   for (scb = scb_base; scb; scb = scb->next)
 174     if (scb->fd == fd)
 175       return scb;
 176
 177   return NULL;
 178 }
 179
 180 /* Create a new serial for OPS.  */
 181
 182 static struct serial *
 183 new_serial (const struct serial_ops *ops)
 184 {
 185   struct serial *scb;
 186
 187   scb = XCNEW (struct serial);
 188
 189   scb->ops = ops;
 190
 191   scb->bufp = scb->buf;
 192   scb->error_fd = -1;
 193   scb->refcnt = 1;
 194
 195   return scb;
 196 }
 197
 198 static struct serial *serial_open_ops_1 (const struct serial_ops *ops,
 199                                          const char *open_name);
 200
 201 /* Open up a device or a network socket, depending upon the syntax of NAME.  */
 202
 203 struct serial *
 204 serial_open (const char *name)
 205 {
 206   const struct serial_ops *ops;
 207   const char *open_name = name;
 208
 209   if (startswith (name, "|"))
 210     {
 211       ops = serial_interface_lookup ("pipe");
 212       /* Discard ``|'' and any space before the command itself.  */
 213       ++open_name;
 214       open_name = skip_spaces (open_name);
 215     }
 216   /* Check for a colon, suggesting an IP address/port pair.
 217      Do this *after* checking for all the interesting prefixes.  We
 218      don't want to constrain the syntax of what can follow them.  */
 219   else if (strchr (name, ':'))
 220     ops = serial_interface_lookup ("tcp");
 221   else
 222     ops = serial_interface_lookup ("hardwire");
 223
 224   if (!ops)
 225     return NULL;
 226
 227   return serial_open_ops_1 (ops, open_name);
 228 }
 229
 230 /* Open up a serial for OPS, passing OPEN_NAME to the open method.  */
 231
 232 static struct serial *
 233 serial_open_ops_1 (const struct serial_ops *ops, const char *open_name)
 234 {
 235   struct serial *scb;
 236
 237   scb = new_serial (ops);
 238
 239   /* `...->open (...)' would get expanded by the open(2) syscall macro.  */
 240   if ((*scb->ops->open) (scb, open_name))
 241     {
 242       xfree (scb);
 243       return NULL;
 244     }
 245
 246   scb->next = scb_base;
 247   scb_base = scb;
 248
 249   if (serial_logfile != NULL)
 250     {
 251       stdio_file_up file (new stdio_file ());
 252
 253       if (!file->open (serial_logfile, "w"))
 254         perror_with_name (serial_logfile);
 255
 256       serial_logfp = file.release ();
 257     }
 258
 259   return scb;
 260 }
 261
 262 /* See serial.h.  */
 263
 264 struct serial *
 265 serial_open_ops (const struct serial_ops *ops)
 266 {
 267   return serial_open_ops_1 (ops, NULL);
 268 }
 269
 270 /* Open a new serial stream using a file handle, using serial
 271    interface ops OPS.  */
 272
 273 static struct serial *
 274 serial_fdopen_ops (const int fd, const struct serial_ops *ops)
 275 {
 276   struct serial *scb;
 277
 278   if (!ops)
 279     {
 280       ops = serial_interface_lookup ("terminal");
 281       if (!ops)
 282         ops = serial_interface_lookup ("hardwire");
 283     }
 284
 285   if (!ops)
 286     return NULL;
 287
 288   scb = new_serial (ops);
 289
 290   scb->next = scb_base;
 291   scb_base = scb;
 292
 293   if ((ops->fdopen) != NULL)
 294     (*ops->fdopen) (scb, fd);
 295   else
 296     scb->fd = fd;
 297
 298   return scb;
 299 }
 300
 301 struct serial *
 302 serial_fdopen (const int fd)
 303 {
 304   return serial_fdopen_ops (fd, NULL);
 305 }
 306
 307 static void
 308 do_serial_close (struct serial *scb, int really_close)
 309 {
 310   struct serial *tmp_scb;
 311
 312   if (serial_logfp)
 313     {
 314       fputs_unfiltered ("\nEnd of log\n", serial_logfp);
 315       serial_current_type = 0;
 316
 317       /* XXX - What if serial_logfp == gdb_stdout or gdb_stderr?  */
 318       delete serial_logfp;
 319       serial_logfp = NULL;
 320     }
 321
 322   /* ensure that the FD has been taken out of async mode.  */
 323   if (scb->async_handler != NULL)
 324     serial_async (scb, NULL, NULL);
 325
 326   if (really_close)
 327     scb->ops->close (scb);
 328
 329   /* For serial_is_open.  */
 330   scb->bufp = NULL;
 331
 332   if (scb_base == scb)
 333     scb_base = scb_base->next;
 334   else
 335     for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
 336       {
 337         if (tmp_scb->next != scb)
 338           continue;
 339
 340         tmp_scb->next = tmp_scb->next->next;
 341         break;
 342       }
 343
 344   serial_unref (scb);
 345 }
 346
 347 void
 348 serial_close (struct serial *scb)
 349 {
 350   do_serial_close (scb, 1);
 351 }
 352
 353 void
 354 serial_un_fdopen (struct serial *scb)
 355 {
 356   do_serial_close (scb, 0);
 357 }
 358
 359 int
 360 serial_is_open (struct serial *scb)
 361 {
 362   return scb->bufp != NULL;
 363 }
 364
 365 void
 366 serial_ref (struct serial *scb)
 367 {
 368   scb->refcnt++;
 369 }
 370
 371 void
 372 serial_unref (struct serial *scb)
 373 {
 374   --scb->refcnt;
 375   if (scb->refcnt == 0)
 376     xfree (scb);
 377 }
 378
 379 int
 380 serial_readchar (struct serial *scb, int timeout)
 381 {
 382   int ch;
 383
 384   /* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
 385      code is finished.  */
 386   if (0 && serial_is_async_p (scb) && timeout < 0)
 387     internal_error (__FILE__, __LINE__,
 388                     _("serial_readchar: blocking read in async mode"));
 389
 390   ch = scb->ops->readchar (scb, timeout);
 391   if (serial_logfp != NULL)
 392     {
 393       serial_logchar (serial_logfp, 'r', ch, timeout);
 394
 395       /* Make sure that the log file is as up-to-date as possible,
 396          in case we are getting ready to dump core or something.  */
 397       gdb_flush (serial_logfp);
 398     }
 399   if (serial_debug_p (scb))
 400     {
 401       fprintf_unfiltered (gdb_stdlog, "[");
 402       serial_logchar (gdb_stdlog, 'r', ch, timeout);
 403       fprintf_unfiltered (gdb_stdlog, "]");
 404       gdb_flush (gdb_stdlog);
 405     }
 406
 407   return (ch);
 408 }
 409
 410 int
 411 serial_write (struct serial *scb, const void *buf, size_t count)
 412 {
 413   if (serial_logfp != NULL)
 414     {
 415       const char *str = (const char *) buf;
 416       size_t c;
 417
 418       for (c = 0; c < count; c++)
 419         serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
 420
 421       /* Make sure that the log file is as up-to-date as possible,
 422          in case we are getting ready to dump core or something.  */
 423       gdb_flush (serial_logfp);
 424     }
 425   if (serial_debug_p (scb))
 426     {
 427       const char *str = (const char *) buf;
 428       size_t c;
 429
 430       for (c = 0; c < count; c++)
 431         {
 432           fprintf_unfiltered (gdb_stdlog, "[");
 433           serial_logchar (gdb_stdlog, 'w', str[c] & 0xff, 0);
 434           fprintf_unfiltered (gdb_stdlog, "]");
 435         }
 436       gdb_flush (gdb_stdlog);
 437     }
 438
 439   return (scb->ops->write (scb, buf, count));
 440 }
 441
 442 void
 443 serial_printf (struct serial *desc, const char *format,...)
 444 {
 445   va_list args;
 446   char *buf;
 447   va_start (args, format);
 448
 449   buf = xstrvprintf (format, args);
 450   serial_write (desc, buf, strlen (buf));
 451
 452   xfree (buf);
 453   va_end (args);
 454 }
 455
 456 int
 457 serial_drain_output (struct serial *scb)
 458 {
 459   return scb->ops->drain_output (scb);
 460 }
 461
 462 int
 463 serial_flush_output (struct serial *scb)
 464 {
 465   return scb->ops->flush_output (scb);
 466 }
 467
 468 int
 469 serial_flush_input (struct serial *scb)
 470 {
 471   return scb->ops->flush_input (scb);
 472 }
 473
 474 int
 475 serial_send_break (struct serial *scb)
 476 {
 477   if (serial_logfp != NULL)
 478     serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
 479
 480   return (scb->ops->send_break (scb));
 481 }
 482
 483 void
 484 serial_raw (struct serial *scb)
 485 {
 486   scb->ops->go_raw (scb);
 487 }
 488
 489 serial_ttystate
 490 serial_get_tty_state (struct serial *scb)
 491 {
 492   return scb->ops->get_tty_state (scb);
 493 }
 494
 495 serial_ttystate
 496 serial_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
 497 {
 498   return scb->ops->copy_tty_state (scb, ttystate);
 499 }
 500
 501 int
 502 serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
 503 {
 504   return scb->ops->set_tty_state (scb, ttystate);
 505 }
 506
 507 void
 508 serial_print_tty_state (struct serial *scb,
 509                         serial_ttystate ttystate,
 510                         struct ui_file *stream)
 511 {
 512   scb->ops->print_tty_state (scb, ttystate, stream);
 513 }
 514
 515 int
 516 serial_setbaudrate (struct serial *scb, int rate)
 517 {
 518   return scb->ops->setbaudrate (scb, rate);
 519 }
 520
 521 int
 522 serial_setstopbits (struct serial *scb, int num)
 523 {
 524   return scb->ops->setstopbits (scb, num);
 525 }
 526
 527 /* See serial.h.  */
 528
 529 int
 530 serial_setparity (struct serial *scb, int parity)
 531 {
 532   return scb->ops->setparity (scb, parity);
 533 }
 534
 535 int
 536 serial_can_async_p (struct serial *scb)
 537 {
 538   return (scb->ops->async != NULL);
 539 }
 540
 541 int
 542 serial_is_async_p (struct serial *scb)
 543 {
 544   return (scb->ops->async != NULL) && (scb->async_handler != NULL);
 545 }
 546
 547 void
 548 serial_async (struct serial *scb,
 549               serial_event_ftype *handler,
 550               void *context)
 551 {
 552   int changed = ((scb->async_handler == NULL) != (handler == NULL));
 553
 554   scb->async_handler = handler;
 555   scb->async_context = context;
 556   /* Only change mode if there is a need.  */
 557   if (changed)
 558     scb->ops->async (scb, handler != NULL);
 559 }
 560
 561 void
 562 serial_debug (struct serial *scb, int debug_p)
 563 {
 564   scb->debug_p = debug_p;
 565 }
 566
 567 int
 568 serial_debug_p (struct serial *scb)
 569 {
 570   return scb->debug_p || global_serial_debug_p;
 571 }
 572
 573 #ifdef USE_WIN32API
 574 void
 575 serial_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
 576 {
 577   if (scb->ops->wait_handle)
 578     scb->ops->wait_handle (scb, read, except);
 579   else
 580     {
 581       *read = (HANDLE) _get_osfhandle (scb->fd);
 582       *except = NULL;
 583     }
 584 }
 585
 586 void
 587 serial_done_wait_handle (struct serial *scb)
 588 {
 589   if (scb->ops->done_wait_handle)
 590     scb->ops->done_wait_handle (scb);
 591 }
 592 #endif
 593
 594 int
 595 serial_pipe (struct serial *scbs[2])
 596 {
 597   const struct serial_ops *ops;
 598   int fildes[2];
 599
 600   ops = serial_interface_lookup ("pipe");
 601   if (!ops)
 602     {
 603       errno = ENOSYS;
 604       return -1;
 605     }
 606
 607   if (gdb_pipe (fildes) == -1)
 608     return -1;
 609
 610   scbs[0] = serial_fdopen_ops (fildes[0], ops);
 611   scbs[1] = serial_fdopen_ops (fildes[1], ops);
 612   return 0;
 613 }
 614
 615 /* Serial set/show framework.  */
 616
 617 static struct cmd_list_element *serial_set_cmdlist;
 618 static struct cmd_list_element *serial_show_cmdlist;
 619
 620 static void
 621 serial_set_cmd (const char *args, int from_tty)
 622 {
 623   printf_unfiltered ("\"set serial\" must be followed "
 624                      "by the name of a command.\n");
 625   help_list (serial_set_cmdlist, "set serial ", all_commands, gdb_stdout);
 626 }
 627
 628 static void
 629 serial_show_cmd (const char *args, int from_tty)
 630 {
 631   cmd_show_list (serial_show_cmdlist, from_tty, "");
 632 }
 633
 634 /* Baud rate specified for talking to serial target systems.  Default
 635    is left as -1, so targets can choose their own defaults.  */
 636 /* FIXME: This means that "show serial baud" and gr_files_info can
 637    print -1 or (unsigned int)-1.  This is a Bad User Interface.  */
 638
 639 int baud_rate = -1;
 640
 641 static void
 642 serial_baud_show_cmd (struct ui_file *file, int from_tty,
 643                       struct cmd_list_element *c, const char *value)
 644 {
 645   fprintf_filtered (file, _("Baud rate for remote serial I/O is %s.\n"),
 646                     value);
 647 }
 648
 649 /* Parity for serial port.  */
 650
 651 int serial_parity = GDBPARITY_NONE;
 652
 653 static const char parity_none[] = "none";
 654 static const char parity_odd[] = "odd";
 655 static const char parity_even[] = "even";
 656 static const char *const parity_enums[] =
 657   {parity_none, parity_odd, parity_even,  NULL};
 658 static const char *parity = parity_none;
 659
 660 /* Set serial_parity value.  */
 661
 662 static void
 663 set_parity (const char *ignore_args, int from_tty, struct cmd_list_element *c)
 664 {
 665   if (parity == parity_odd)
 666     serial_parity = GDBPARITY_ODD;
 667   else if (parity == parity_even)
 668     serial_parity = GDBPARITY_EVEN;
 669   else
 670     serial_parity = GDBPARITY_NONE;
 671 }
 672
 673 void
 674 _initialize_serial (void)
 675 {
 676 #if 0
 677   add_com ("connect", class_obscure, connect_command, _("\
 678 Connect the terminal directly up to the command monitor.\n\
 679 Use <CR>~. or <CR>~^D to break out."));
 680 #endif /* 0 */
 681
 682   add_prefix_cmd ("serial", class_maintenance, serial_set_cmd, _("\
 683 Set default serial/parallel port configuration."),
 684                   &serial_set_cmdlist, "set serial ",
 685                   0/*allow-unknown*/,
 686                   &setlist);
 687
 688   add_prefix_cmd ("serial", class_maintenance, serial_show_cmd, _("\
 689 Show default serial/parallel port configuration."),
 690                   &serial_show_cmdlist, "show serial ",
 691                   0/*allow-unknown*/,
 692                   &showlist);
 693
 694   /* If target is open when baud changes, it doesn't take effect until
 695      the next open (I think, not sure).  */
 696   add_setshow_zinteger_cmd ("baud", no_class, &baud_rate, _("\
 697 Set baud rate for remote serial I/O."), _("\
 698 Show baud rate for remote serial I/O."), _("\
 699 This value is used to set the speed of the serial port when debugging\n\
 700 using remote targets."),
 701                             NULL,
 702                             serial_baud_show_cmd,
 703                             &serial_set_cmdlist, &serial_show_cmdlist);
 704
 705   add_setshow_enum_cmd ("parity", no_class, parity_enums,
 706                         &parity, _("\
 707 Set parity for remote serial I/O"), _("\
 708 Show parity for remote serial I/O"), NULL,
 709                         set_parity,
 710                         NULL, /* FIXME: i18n: */
 711                         &serial_set_cmdlist, &serial_show_cmdlist);
 712
 713   add_setshow_filename_cmd ("remotelogfile", no_class, &serial_logfile, _("\
 714 Set filename for remote session recording."), _("\
 715 Show filename for remote session recording."), _("\
 716 This file is used to record the remote session for future playback\n\
 717 by gdbserver."),
 718                             NULL,
 719                             NULL, /* FIXME: i18n: */
 720                             &setlist, &showlist);
 721
 722   add_setshow_enum_cmd ("remotelogbase", no_class, logbase_enums,
 723                         &serial_logbase, _("\
 724 Set numerical base for remote session logging"), _("\
 725 Show numerical base for remote session logging"), NULL,
 726                         NULL,
 727                         NULL, /* FIXME: i18n: */
 728                         &setlist, &showlist);
 729
 730   add_setshow_zuinteger_cmd ("serial", class_maintenance,
 731                              &global_serial_debug_p, _("\
 732 Set serial debugging."), _("\
 733 Show serial debugging."), _("\
 734 When non-zero, serial port debugging is enabled."),
 735                              NULL,
 736                              NULL, /* FIXME: i18n: */
 737                              &setdebuglist, &showdebuglist);
 738 }