gdb/serial.c

   1 /* Generic serial interface routines
   2
   3    Copyright (C) 1992-2022 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 /* Serial I/O handlers.  */
  31
  32 static std::vector<const struct serial_ops *> serial_ops_list;
  33
  34 /* Pointer to list of scb's.  */
  35
  36 static struct serial *scb_base;
  37
  38 /* Non-NULL gives filename which contains a recording of the remote session,
  39    suitable for playback by gdbserver.  */
  40
  41 static std::string serial_logfile;
  42 static struct ui_file *serial_logfp = NULL;
  43
  44 static const struct serial_ops *serial_interface_lookup (const char *);
  45 static void serial_logchar (struct ui_file *stream,
  46                             int ch_type, int ch, int timeout);
  47 static const char logbase_hex[] = "hex";
  48 static const char logbase_octal[] = "octal";
  49 static const char logbase_ascii[] = "ascii";
  50 static const char *const logbase_enums[] =
  51 {logbase_hex, logbase_octal, logbase_ascii, NULL};
  52 static const char *serial_logbase = logbase_ascii;
  53 \f
  54
  55 static int serial_current_type = 0;
  56
  57 /* Log char CH of type CHTYPE, with TIMEOUT.  */
  58
  59 /* Define bogus char to represent a BREAK.  Should be careful to choose a value
  60    that can't be confused with a normal char, or an error code.  */
  61 #define SERIAL_BREAK 1235
  62
  63 static void
  64 serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
  65 {
  66   if (ch_type != serial_current_type)
  67     {
  68       gdb_printf (stream, "\n%c ", ch_type);
  69       serial_current_type = ch_type;
  70     }
  71
  72   if (serial_logbase != logbase_ascii)
  73     gdb_putc (' ', stream);
  74
  75   switch (ch)
  76     {
  77     case SERIAL_TIMEOUT:
  78       gdb_printf (stream, "<Timeout: %d seconds>", timeout);
  79       return;
  80     case SERIAL_ERROR:
  81       gdb_printf (stream, "<Error: %s>", safe_strerror (errno));
  82       return;
  83     case SERIAL_EOF:
  84       gdb_puts ("<Eof>", stream);
  85       return;
  86     case SERIAL_BREAK:
  87       gdb_puts ("<Break>", stream);
  88       return;
  89     default:
  90       if (serial_logbase == logbase_hex)
  91         gdb_printf (stream, "%02x", ch & 0xff);
  92       else if (serial_logbase == logbase_octal)
  93         gdb_printf (stream, "%03o", ch & 0xff);
  94       else
  95         switch (ch)
  96           {
  97           case '\\':
  98             gdb_puts ("\\\\", stream);
  99             break;
 100           case '\b':
 101             gdb_puts ("\\b", stream);
 102             break;
 103           case '\f':
 104             gdb_puts ("\\f", stream);
 105             break;
 106           case '\n':
 107             gdb_puts ("\\n", stream);
 108             break;
 109           case '\r':
 110             gdb_puts ("\\r", stream);
 111             break;
 112           case '\t':
 113             gdb_puts ("\\t", stream);
 114             break;
 115           case '\v':
 116             gdb_puts ("\\v", stream);
 117             break;
 118           default:
 119             gdb_printf (stream,
 120                         isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
 121             break;
 122           }
 123     }
 124 }
 125
 126 void
 127 serial_log_command (struct target_ops *self, const char *cmd)
 128 {
 129   if (!serial_logfp)
 130     return;
 131
 132   serial_current_type = 'c';
 133
 134   gdb_puts ("\nc ", serial_logfp);
 135   gdb_puts (cmd, serial_logfp);
 136
 137   /* Make sure that the log file is as up-to-date as possible,
 138      in case we are getting ready to dump core or something.  */
 139   gdb_flush (serial_logfp);
 140 }
 141
 142 \f
 143 static const struct serial_ops *
 144 serial_interface_lookup (const char *name)
 145 {
 146   for (const serial_ops *ops : serial_ops_list)
 147     if (strcmp (name, ops->name) == 0)
 148       return ops;
 149
 150   return NULL;
 151 }
 152
 153 void
 154 serial_add_interface (const struct serial_ops *optable)
 155 {
 156   serial_ops_list.push_back (optable);
 157 }
 158
 159 /* Return the open serial device for FD, if found, or NULL if FD is
 160    not already opened.  */
 161
 162 struct serial *
 163 serial_for_fd (int fd)
 164 {
 165   struct serial *scb;
 166
 167   for (scb = scb_base; scb; scb = scb->next)
 168     if (scb->fd == fd)
 169       return scb;
 170
 171   return NULL;
 172 }
 173
 174 /* Create a new serial for OPS.  */
 175
 176 static struct serial *
 177 new_serial (const struct serial_ops *ops)
 178 {
 179   struct serial *scb;
 180
 181   scb = XCNEW (struct serial);
 182
 183   scb->ops = ops;
 184
 185   scb->bufp = scb->buf;
 186   scb->error_fd = -1;
 187   scb->refcnt = 1;
 188
 189   return scb;
 190 }
 191
 192 static struct serial *serial_open_ops_1 (const struct serial_ops *ops,
 193                                          const char *open_name);
 194
 195 /* Open up a device or a network socket, depending upon the syntax of NAME.  */
 196
 197 struct serial *
 198 serial_open (const char *name)
 199 {
 200   const struct serial_ops *ops;
 201   const char *open_name = name;
 202
 203   if (startswith (name, "|"))
 204     ops = serial_interface_lookup ("pipe");
 205   /* Check for a colon, suggesting an IP address/port pair.
 206      Do this *after* checking for all the interesting prefixes.  We
 207      don't want to constrain the syntax of what can follow them.  */
 208   else if (strchr (name, ':'))
 209     ops = serial_interface_lookup ("tcp");
 210   else
 211     {
 212 #ifndef USE_WIN32API
 213       /* Check to see if name is a socket.  If it is, then treat it
 214          as such.  Otherwise assume that it's a character device.  */
 215       struct stat sb;
 216       if (stat (name, &sb) == 0 && (sb.st_mode & S_IFMT) == S_IFSOCK)
 217         ops = serial_interface_lookup ("local");
 218       else
 219 #endif
 220         ops = serial_interface_lookup ("hardwire");
 221     }
 222
 223   if (!ops)
 224     return NULL;
 225
 226   return serial_open_ops_1 (ops, open_name);
 227 }
 228
 229 /* Open up a serial for OPS, passing OPEN_NAME to the open method.  */
 230
 231 static struct serial *
 232 serial_open_ops_1 (const struct serial_ops *ops, const char *open_name)
 233 {
 234   struct serial *scb;
 235
 236   scb = new_serial (ops);
 237
 238   /* `...->open (...)' would get expanded by the open(2) syscall macro.  */
 239   if ((*scb->ops->open) (scb, open_name))
 240     {
 241       xfree (scb);
 242       return NULL;
 243     }
 244
 245   scb->name = open_name != NULL ? xstrdup (open_name) : NULL;
 246   scb->next = scb_base;
 247   scb_base = scb;
 248
 249   if (!serial_logfile.empty ())
 250     {
 251       stdio_file_up file (new stdio_file ());
 252
 253       if (!file->open (serial_logfile.c_str (), "w"))
 254         perror_with_name (serial_logfile.c_str ());
 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->name = NULL;
 291   scb->next = scb_base;
 292   scb_base = scb;
 293
 294   if ((ops->fdopen) != NULL)
 295     (*ops->fdopen) (scb, fd);
 296   else
 297     scb->fd = fd;
 298
 299   return scb;
 300 }
 301
 302 struct serial *
 303 serial_fdopen (const int fd)
 304 {
 305   return serial_fdopen_ops (fd, NULL);
 306 }
 307
 308 static void
 309 do_serial_close (struct serial *scb, int really_close)
 310 {
 311   struct serial *tmp_scb;
 312
 313   if (serial_logfp)
 314     {
 315       gdb_puts ("\nEnd of log\n", serial_logfp);
 316       serial_current_type = 0;
 317
 318       /* XXX - What if serial_logfp == gdb_stdout or gdb_stderr?  */
 319       delete serial_logfp;
 320       serial_logfp = NULL;
 321     }
 322
 323   /* ensure that the FD has been taken out of async mode.  */
 324   if (scb->async_handler != NULL)
 325     serial_async (scb, NULL, NULL);
 326
 327   if (really_close)
 328     scb->ops->close (scb);
 329
 330   xfree (scb->name);
 331
 332   /* For serial_is_open.  */
 333   scb->bufp = NULL;
 334
 335   if (scb_base == scb)
 336     scb_base = scb_base->next;
 337   else
 338     for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
 339       {
 340         if (tmp_scb->next != scb)
 341           continue;
 342
 343         tmp_scb->next = tmp_scb->next->next;
 344         break;
 345       }
 346
 347   serial_unref (scb);
 348 }
 349
 350 void
 351 serial_close (struct serial *scb)
 352 {
 353   do_serial_close (scb, 1);
 354 }
 355
 356 void
 357 serial_un_fdopen (struct serial *scb)
 358 {
 359   do_serial_close (scb, 0);
 360 }
 361
 362 int
 363 serial_is_open (struct serial *scb)
 364 {
 365   return scb->bufp != NULL;
 366 }
 367
 368 void
 369 serial_ref (struct serial *scb)
 370 {
 371   scb->refcnt++;
 372 }
 373
 374 void
 375 serial_unref (struct serial *scb)
 376 {
 377   --scb->refcnt;
 378   if (scb->refcnt == 0)
 379     xfree (scb);
 380 }
 381
 382 int
 383 serial_readchar (struct serial *scb, int timeout)
 384 {
 385   int ch;
 386
 387   /* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
 388      code is finished.  */
 389   if (0 && serial_is_async_p (scb) && timeout < 0)
 390     internal_error (__FILE__, __LINE__,
 391                     _("serial_readchar: blocking read in async mode"));
 392
 393   ch = scb->ops->readchar (scb, timeout);
 394   if (serial_logfp != NULL)
 395     {
 396       serial_logchar (serial_logfp, 'r', ch, timeout);
 397
 398       /* Make sure that the log file is as up-to-date as possible,
 399          in case we are getting ready to dump core or something.  */
 400       gdb_flush (serial_logfp);
 401     }
 402   if (serial_debug_p (scb))
 403     {
 404       gdb_printf (gdb_stdlog, "[");
 405       serial_logchar (gdb_stdlog, 'r', ch, timeout);
 406       gdb_printf (gdb_stdlog, "]");
 407       gdb_flush (gdb_stdlog);
 408     }
 409
 410   return (ch);
 411 }
 412
 413 int
 414 serial_write (struct serial *scb, const void *buf, size_t count)
 415 {
 416   if (serial_logfp != NULL)
 417     {
 418       const char *str = (const char *) buf;
 419       size_t c;
 420
 421       for (c = 0; c < count; c++)
 422         serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
 423
 424       /* Make sure that the log file is as up-to-date as possible,
 425          in case we are getting ready to dump core or something.  */
 426       gdb_flush (serial_logfp);
 427     }
 428   if (serial_debug_p (scb))
 429     {
 430       const char *str = (const char *) buf;
 431       size_t c;
 432
 433       for (c = 0; c < count; c++)
 434         {
 435           gdb_printf (gdb_stdlog, "[");
 436           serial_logchar (gdb_stdlog, 'w', str[c] & 0xff, 0);
 437           gdb_printf (gdb_stdlog, "]");
 438         }
 439       gdb_flush (gdb_stdlog);
 440     }
 441
 442   return (scb->ops->write (scb, buf, count));
 443 }
 444
 445 void
 446 serial_printf (struct serial *desc, const char *format, ...)
 447 {
 448   va_list args;
 449   va_start (args, format);
 450
 451   std::string buf = string_vprintf (format, args);
 452   serial_write (desc, buf.c_str (), buf.length ());
 453
 454   va_end (args);
 455 }
 456
 457 int
 458 serial_drain_output (struct serial *scb)
 459 {
 460   return scb->ops->drain_output (scb);
 461 }
 462
 463 int
 464 serial_flush_output (struct serial *scb)
 465 {
 466   return scb->ops->flush_output (scb);
 467 }
 468
 469 int
 470 serial_flush_input (struct serial *scb)
 471 {
 472   return scb->ops->flush_input (scb);
 473 }
 474
 475 int
 476 serial_send_break (struct serial *scb)
 477 {
 478   if (serial_logfp != NULL)
 479     serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
 480
 481   return (scb->ops->send_break (scb));
 482 }
 483
 484 void
 485 serial_raw (struct serial *scb)
 486 {
 487   scb->ops->go_raw (scb);
 488 }
 489
 490 serial_ttystate
 491 serial_get_tty_state (struct serial *scb)
 492 {
 493   return scb->ops->get_tty_state (scb);
 494 }
 495
 496 serial_ttystate
 497 serial_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
 498 {
 499   return scb->ops->copy_tty_state (scb, ttystate);
 500 }
 501
 502 int
 503 serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
 504 {
 505   return scb->ops->set_tty_state (scb, ttystate);
 506 }
 507
 508 void
 509 serial_print_tty_state (struct serial *scb,
 510                         serial_ttystate ttystate,
 511                         struct ui_file *stream)
 512 {
 513   scb->ops->print_tty_state (scb, ttystate, stream);
 514 }
 515
 516 int
 517 serial_setbaudrate (struct serial *scb, int rate)
 518 {
 519   return scb->ops->setbaudrate (scb, rate);
 520 }
 521
 522 int
 523 serial_setstopbits (struct serial *scb, int num)
 524 {
 525   return scb->ops->setstopbits (scb, num);
 526 }
 527
 528 /* See serial.h.  */
 529
 530 int
 531 serial_setparity (struct serial *scb, int parity)
 532 {
 533   return scb->ops->setparity (scb, parity);
 534 }
 535
 536 int
 537 serial_can_async_p (struct serial *scb)
 538 {
 539   return (scb->ops->async != NULL);
 540 }
 541
 542 int
 543 serial_is_async_p (struct serial *scb)
 544 {
 545   return (scb->ops->async != NULL) && (scb->async_handler != NULL);
 546 }
 547
 548 void
 549 serial_async (struct serial *scb,
 550               serial_event_ftype *handler,
 551               void *context)
 552 {
 553   int changed = ((scb->async_handler == NULL) != (handler == NULL));
 554
 555   scb->async_handler = handler;
 556   scb->async_context = context;
 557   /* Only change mode if there is a need.  */
 558   if (changed)
 559     scb->ops->async (scb, handler != NULL);
 560 }
 561
 562 void
 563 serial_debug (struct serial *scb, int debug_p)
 564 {
 565   scb->debug_p = debug_p;
 566 }
 567
 568 int
 569 serial_debug_p (struct serial *scb)
 570 {
 571   return scb->debug_p || global_serial_debug_p;
 572 }
 573
 574 #ifdef USE_WIN32API
 575 void
 576 serial_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
 577 {
 578   if (scb->ops->wait_handle)
 579     scb->ops->wait_handle (scb, read, except);
 580   else
 581     {
 582       *read = (HANDLE) _get_osfhandle (scb->fd);
 583       *except = NULL;
 584     }
 585 }
 586
 587 void
 588 serial_done_wait_handle (struct serial *scb)
 589 {
 590   if (scb->ops->done_wait_handle)
 591     scb->ops->done_wait_handle (scb);
 592 }
 593 #endif
 594
 595 int
 596 serial_pipe (struct serial *scbs[2])
 597 {
 598   const struct serial_ops *ops;
 599   int fildes[2];
 600
 601   ops = serial_interface_lookup ("pipe");
 602   if (!ops)
 603     {
 604       errno = ENOSYS;
 605       return -1;
 606     }
 607
 608   if (gdb_pipe (fildes) == -1)
 609     return -1;
 610
 611   scbs[0] = serial_fdopen_ops (fildes[0], ops);
 612   scbs[1] = serial_fdopen_ops (fildes[1], ops);
 613   return 0;
 614 }
 615
 616 /* Serial set/show framework.  */
 617
 618 static struct cmd_list_element *serial_set_cmdlist;
 619 static struct cmd_list_element *serial_show_cmdlist;
 620
 621 /* See serial.h.  */
 622
 623 int baud_rate = -1;
 624
 625 static void
 626 serial_baud_show_cmd (struct ui_file *file, int from_tty,
 627                       struct cmd_list_element *c, const char *value)
 628 {
 629   gdb_printf (file, _("Baud rate for remote serial I/O is %s.\n"),
 630               value);
 631 }
 632
 633 /* See serial.h.  */
 634
 635 int serial_parity = GDBPARITY_NONE;
 636
 637 static const char parity_none[] = "none";
 638 static const char parity_odd[] = "odd";
 639 static const char parity_even[] = "even";
 640 static const char *const parity_enums[] =
 641   {parity_none, parity_odd, parity_even,  NULL};
 642 static const char *parity = parity_none;
 643
 644 /* Set serial_parity value.  */
 645
 646 static void
 647 set_parity (const char *ignore_args, int from_tty, struct cmd_list_element *c)
 648 {
 649   if (parity == parity_odd)
 650     serial_parity = GDBPARITY_ODD;
 651   else if (parity == parity_even)
 652     serial_parity = GDBPARITY_EVEN;
 653   else
 654     serial_parity = GDBPARITY_NONE;
 655 }
 656
 657 void _initialize_serial ();
 658 void
 659 _initialize_serial ()
 660 {
 661 #if 0
 662   add_com ("connect", class_obscure, connect_command, _("\
 663 Connect the terminal directly up to the command monitor.\n\
 664 Use <CR>~. or <CR>~^D to break out."));
 665 #endif /* 0 */
 666
 667   add_setshow_prefix_cmd ("serial", class_maintenance,
 668                           _("Set default serial/parallel port configuration."),
 669                           _("Show default serial/parallel port configuration."),
 670                           &serial_set_cmdlist, &serial_show_cmdlist,
 671                           &setlist, &showlist);
 672
 673   /* If target is open when baud changes, it doesn't take effect until
 674      the next open (I think, not sure).  */
 675   add_setshow_zinteger_cmd ("baud", no_class, &baud_rate, _("\
 676 Set baud rate for remote serial I/O."), _("\
 677 Show baud rate for remote serial I/O."), _("\
 678 This value is used to set the speed of the serial port when debugging\n\
 679 using remote targets."),
 680                             NULL,
 681                             serial_baud_show_cmd,
 682                             &serial_set_cmdlist, &serial_show_cmdlist);
 683
 684   add_setshow_enum_cmd ("parity", no_class, parity_enums,
 685                         &parity, _("\
 686 Set parity for remote serial I/O."), _("\
 687 Show parity for remote serial I/O."), NULL,
 688                         set_parity,
 689                         NULL, /* FIXME: i18n: */
 690                         &serial_set_cmdlist, &serial_show_cmdlist);
 691
 692   add_setshow_filename_cmd ("remotelogfile", no_class, &serial_logfile, _("\
 693 Set filename for remote session recording."), _("\
 694 Show filename for remote session recording."), _("\
 695 This file is used to record the remote session for future playback\n\
 696 by gdbserver."),
 697                             NULL,
 698                             NULL, /* FIXME: i18n: */
 699                             &setlist, &showlist);
 700
 701   add_setshow_enum_cmd ("remotelogbase", no_class, logbase_enums,
 702                         &serial_logbase, _("\
 703 Set numerical base for remote session logging."), _("\
 704 Show numerical base for remote session logging."), NULL,
 705                         NULL,
 706                         NULL, /* FIXME: i18n: */
 707                         &setlist, &showlist);
 708
 709   add_setshow_zuinteger_cmd ("serial", class_maintenance,
 710                              &global_serial_debug_p, _("\
 711 Set serial debugging."), _("\
 712 Show serial debugging."), _("\
 713 When non-zero, serial port debugging is enabled."),
 714                              NULL,
 715                              NULL, /* FIXME: i18n: */
 716                              &setdebuglist, &showdebuglist);
 717 }