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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "gdb_server.h"
  31 #include "target_request.h"
  32 #include "register.h"
  33 #include "server.h"
  34 #include "flash.h"
  35 #include "image.h"
  36 #include "jtag.h"
  37
  38
  39 #if 0
  40 #define _DEBUG_GDB_IO_
  41 #endif
  42
  43 static int gdb_breakpoint_override;
  44 static enum breakpoint_type gdb_breakpoint_override_type;
  45
  46 extern int gdb_error(connection_t *connection, int retval);
  47 static unsigned short gdb_port = 3333;
  48 static const char *DIGITS = "0123456789abcdef";
  49
  50 static void gdb_log_callback(void *priv, const char *file, int line,
  51                 const char *function, const char *string);
  52
  53 enum gdb_detach_mode
  54 {
  55         GDB_DETACH_RESUME,
  56         GDB_DETACH_RESET,
  57         GDB_DETACH_HALT,
  58         GDB_DETACH_NOTHING
  59 };
  60
  61 /* target behaviour on gdb detach */
  62 enum gdb_detach_mode detach_mode = GDB_DETACH_RESUME;
  63
  64 /* number of gdb connections, mainly to supress gdb related debugging spam
  65  * in helper/log.c when no gdb connections are actually active */
  66 int gdb_actual_connections;
  67
  68 /* set if we are sending a memory map to gdb
  69  * via qXfer:memory-map:read packet */
  70 /* enabled by default*/
  71 int gdb_use_memory_map = 1;
  72 /* enabled by default*/
  73 int gdb_flash_program = 1;
  74
  75 /* if set, data aborts cause an error to be reported in memory read packets
  76  * see the code in gdb_read_memory_packet() for further explanations */
  77 int gdb_report_data_abort = 0;
  78
  79 int gdb_last_signal(target_t *target)
  80 {
  81         switch (target->debug_reason)
  82         {
  83                 case DBG_REASON_DBGRQ:
  84                         return 0x2; /* SIGINT */
  85                 case DBG_REASON_BREAKPOINT:
  86                 case DBG_REASON_WATCHPOINT:
  87                 case DBG_REASON_WPTANDBKPT:
  88                         return 0x05; /* SIGTRAP */
  89                 case DBG_REASON_SINGLESTEP:
  90                         return 0x05; /* SIGTRAP */
  91                 case DBG_REASON_NOTHALTED:
  92                         return 0x0; /* no signal... shouldn't happen */
  93                 default:
  94                         LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason);
  95                         return 0x0;
  96         }
  97 }
  98
  99 int check_pending(connection_t *connection, int timeout_s, int *got_data)
 100 {
 101         /* a non-blocking socket will block if there is 0 bytes available on the socket,
 102          * but return with as many bytes as are available immediately
 103          */
 104         struct timeval tv;
 105         fd_set read_fds;
 106         gdb_connection_t *gdb_con = connection->priv;
 107         int t;
 108         if (got_data == NULL)
 109                 got_data=&t;
 110         *got_data = 0;
 111
 112         if (gdb_con->buf_cnt > 0)
 113         {
 114                 *got_data = 1;
 115                 return ERROR_OK;
 116         }
 117
 118         FD_ZERO(&read_fds);
 119         FD_SET(connection->fd, &read_fds);
 120
 121         tv.tv_sec = timeout_s;
 122         tv.tv_usec = 0;
 123         if (socket_select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0)
 124         {
 125                 /* This can typically be because a "monitor" command took too long
 126                  * before printing any progress messages
 127                  */
 128                 if (timeout_s > 0)
 129                 {
 130                         return ERROR_GDB_TIMEOUT;
 131                 } else
 132                 {
 133                         return ERROR_OK;
 134                 }
 135         }
 136         *got_data = FD_ISSET(connection->fd, &read_fds) != 0;
 137         return ERROR_OK;
 138 }
 139
 140 int gdb_get_char(connection_t *connection, int* next_char)
 141 {
 142         gdb_connection_t *gdb_con = connection->priv;
 143         int retval = ERROR_OK;
 144
 145 #ifdef _DEBUG_GDB_IO_
 146         char *debug_buffer;
 147 #endif
 148
 149         if (gdb_con->buf_cnt-- > 0)
 150         {
 151                 *next_char = *(gdb_con->buf_p++);
 152                 if (gdb_con->buf_cnt > 0)
 153                         connection->input_pending = 1;
 154                 else
 155                         connection->input_pending = 0;
 156
 157 #ifdef _DEBUG_GDB_IO_
 158                 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
 159 #endif
 160
 161                 return ERROR_OK;
 162         }
 163
 164         for (;;)
 165         {
 166                 if (connection->service->type == CONNECTION_PIPE)
 167                 {
 168                         gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
 169                 }
 170                 else
 171                 {
 172                         retval = check_pending(connection, 1, NULL);
 173                         if (retval != ERROR_OK)
 174                                 return retval;
 175                         gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
 176                 }
 177
 178                 if (gdb_con->buf_cnt > 0)
 179                 {
 180                         break;
 181                 }
 182                 if (gdb_con->buf_cnt == 0)
 183                 {
 184                         gdb_con->closed = 1;
 185                         return ERROR_SERVER_REMOTE_CLOSED;
 186                 }
 187
 188 #ifdef _WIN32
 189                 errno = WSAGetLastError();
 190
 191                 switch (errno)
 192                 {
 193                         case WSAEWOULDBLOCK:
 194                                 usleep(1000);
 195                                 break;
 196                         case WSAECONNABORTED:
 197                                 gdb_con->closed = 1;
 198                                 return ERROR_SERVER_REMOTE_CLOSED;
 199                         case WSAECONNRESET:
 200                                 gdb_con->closed = 1;
 201                                 return ERROR_SERVER_REMOTE_CLOSED;
 202                         default:
 203                                 LOG_ERROR("read: %d", errno);
 204                                 exit(-1);
 205                 }
 206 #else
 207                 switch (errno)
 208                 {
 209                         case EAGAIN:
 210                                 usleep(1000);
 211                                 break;
 212                         case ECONNABORTED:
 213                                 gdb_con->closed = 1;
 214                                 return ERROR_SERVER_REMOTE_CLOSED;
 215                         case ECONNRESET:
 216                                 gdb_con->closed = 1;
 217                                 return ERROR_SERVER_REMOTE_CLOSED;
 218                         default:
 219                                 LOG_ERROR("read: %s", strerror(errno));
 220                                 gdb_con->closed = 1;
 221                                 return ERROR_SERVER_REMOTE_CLOSED;
 222                 }
 223 #endif
 224         }
 225
 226 #ifdef _DEBUG_GDB_IO_
 227         debug_buffer = malloc(gdb_con->buf_cnt + 1);
 228         memcpy(debug_buffer, gdb_con->buffer, gdb_con->buf_cnt);
 229         debug_buffer[gdb_con->buf_cnt] = 0;
 230         LOG_DEBUG("received '%s'", debug_buffer);
 231         free(debug_buffer);
 232 #endif
 233
 234         gdb_con->buf_p = gdb_con->buffer;
 235         gdb_con->buf_cnt--;
 236         *next_char = *(gdb_con->buf_p++);
 237         if (gdb_con->buf_cnt > 0)
 238                 connection->input_pending = 1;
 239         else
 240                 connection->input_pending = 0;
 241 #ifdef _DEBUG_GDB_IO_
 242         LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
 243 #endif
 244
 245         return retval;
 246 }
 247
 248 int gdb_putback_char(connection_t *connection, int last_char)
 249 {
 250         gdb_connection_t *gdb_con = connection->priv;
 251
 252         if (gdb_con->buf_p > gdb_con->buffer)
 253         {
 254                 *(--gdb_con->buf_p) = last_char;
 255                 gdb_con->buf_cnt++;
 256         }
 257         else
 258         {
 259                 LOG_ERROR("BUG: couldn't put character back");
 260         }
 261
 262         return ERROR_OK;
 263 }
 264
 265 /* The only way we can detect that the socket is closed is the first time
 266  * we write to it, we will fail. Subsequent write operations will
 267  * succeed. Shudder! */
 268 int gdb_write(connection_t *connection, void *data, int len)
 269 {
 270         gdb_connection_t *gdb_con = connection->priv;
 271         if (gdb_con->closed)
 272                 return ERROR_SERVER_REMOTE_CLOSED;
 273
 274         if (connection->service->type == CONNECTION_PIPE)
 275         {
 276                 /* write to stdout */
 277                 if (write(STDOUT_FILENO, data, len) == len)
 278                 {
 279                         return ERROR_OK;
 280                 }
 281         }
 282         else
 283         {
 284                 if (write_socket(connection->fd, data, len) == len)
 285                 {
 286                         return ERROR_OK;
 287                 }
 288         }
 289         gdb_con->closed = 1;
 290         return ERROR_SERVER_REMOTE_CLOSED;
 291 }
 292
 293 int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
 294 {
 295         int i;
 296         unsigned char my_checksum = 0;
 297 #ifdef _DEBUG_GDB_IO_
 298         char *debug_buffer;
 299 #endif
 300         int reply;
 301         int retval;
 302         gdb_connection_t *gdb_con = connection->priv;
 303
 304         for (i = 0; i < len; i++)
 305                 my_checksum += buffer[i];
 306
 307 #ifdef _DEBUG_GDB_IO_
 308         /*
 309          * At this point we should have nothing in the input queue from GDB,
 310          * however sometimes '-' is sent even though we've already received
 311          * an ACK (+) for everything we've sent off.
 312          */
 313         int gotdata;
 314         for (;;)
 315         {
 316                 if ((retval = check_pending(connection, 0, &gotdata)) != ERROR_OK)
 317                         return retval;
 318                 if (!gotdata)
 319                         break;
 320                 if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
 321                         return retval;
 322                 if (reply == '$') {
 323                         /* fix a problem with some IAR tools */
 324                         gdb_putback_char(connection, reply);
 325                         LOG_DEBUG("Unexpected start of new packet");
 326                         break;
 327                 }
 328
 329                 LOG_WARNING("Discard unexpected char %c", reply);
 330         }
 331 #endif
 332
 333         while (1)
 334         {
 335 #ifdef _DEBUG_GDB_IO_
 336                 debug_buffer = malloc(len + 1);
 337                 memcpy(debug_buffer, buffer, len);
 338                 debug_buffer[len] = 0;
 339                 LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
 340                 free(debug_buffer);
 341 #endif
 342
 343                 char local_buffer[1024];
 344                 local_buffer[0] = '$';
 345                 if ((size_t)len + 4 <= sizeof(local_buffer))
 346                 {
 347                         /* performance gain on smaller packets by only a single call to gdb_write() */
 348                         memcpy(local_buffer + 1, buffer, len++);
 349                         local_buffer[len++] = '#';
 350                         local_buffer[len++] = DIGITS[(my_checksum >> 4) & 0xf];
 351                         local_buffer[len++] = DIGITS[my_checksum & 0xf];
 352                         if ((retval = gdb_write(connection, local_buffer, len)) != ERROR_OK)
 353                         {
 354                                 return retval;
 355                         }
 356                 }
 357                 else
 358                 {
 359                         /* larger packets are transmitted directly from caller supplied buffer
 360                            by several calls to gdb_write() to avoid dynamic allocation */
 361                         local_buffer[1] = '#';
 362                         local_buffer[2] = DIGITS[(my_checksum >> 4) & 0xf];
 363                         local_buffer[3] = DIGITS[my_checksum & 0xf];
 364                         if ((retval = gdb_write(connection, local_buffer, 1)) != ERROR_OK)
 365                         {
 366                                 return retval;
 367                         }
 368                         if ((retval = gdb_write(connection, buffer, len)) != ERROR_OK)
 369                         {
 370                                 return retval;
 371                         }
 372                         if ((retval = gdb_write(connection, local_buffer + 1, 3)) != ERROR_OK)
 373                         {
 374                                 return retval;
 375                         }
 376                 }
 377
 378                 if (gdb_con->noack_mode)
 379                         break;
 380
 381                 if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
 382                         return retval;
 383
 384                 if (reply == '+')
 385                         break;
 386                 else if (reply == '-')
 387                 {
 388                         /* Stop sending output packets for now */
 389                         log_remove_callback(gdb_log_callback, connection);
 390                         LOG_WARNING("negative reply, retrying");
 391                 }
 392                 else if (reply == 0x3)
 393                 {
 394                         gdb_con->ctrl_c = 1;
 395                         if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
 396                                 return retval;
 397                         if (reply == '+')
 398                                 break;
 399                         else if (reply == '-')
 400                         {
 401                                 /* Stop sending output packets for now */
 402                                 log_remove_callback(gdb_log_callback, connection);
 403                                 LOG_WARNING("negative reply, retrying");
 404                         }
 405                         else if (reply == '$') {
 406                                 LOG_ERROR("GDB missing ack(1) - assumed good");
 407                                 gdb_putback_char(connection, reply);
 408                                 return ERROR_OK;
 409                         } else {
 410
 411                                 LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
 412                                 gdb_con->closed = 1;
 413                                 return ERROR_SERVER_REMOTE_CLOSED;
 414                         }
 415                 }
 416                 else if (reply == '$') {
 417                         LOG_ERROR("GDB missing ack(2) - assumed good");
 418                         gdb_putback_char(connection, reply);
 419                         return ERROR_OK;
 420                 }
 421                 else
 422                 {
 423                         LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection", reply);
 424                         gdb_con->closed = 1;
 425                         return ERROR_SERVER_REMOTE_CLOSED;
 426                 }
 427         }
 428         if (gdb_con->closed)
 429                 return ERROR_SERVER_REMOTE_CLOSED;
 430
 431         return ERROR_OK;
 432 }
 433
 434 int gdb_put_packet(connection_t *connection, char *buffer, int len)
 435 {
 436         gdb_connection_t *gdb_con = connection->priv;
 437         gdb_con->busy = 1;
 438         int retval = gdb_put_packet_inner(connection, buffer, len);
 439         gdb_con->busy = 0;
 440
 441         /* we sent some data, reset timer for keep alive messages */
 442         kept_alive();
 443
 444         return retval;
 445 }
 446
 447 static __inline__ int fetch_packet(connection_t *connection, int *checksum_ok, int noack, int *len, char *buffer)
 448 {
 449         unsigned char my_checksum = 0;
 450         char checksum[3];
 451         int character;
 452         int retval;
 453
 454         gdb_connection_t *gdb_con = connection->priv;
 455         my_checksum = 0;
 456         int count = 0;
 457         count = 0;
 458         for (;;)
 459         {
 460                 /* The common case is that we have an entire packet with no escape chars.
 461                  * We need to leave at least 2 bytes in the buffer to have
 462                  * gdb_get_char() update various bits and bobs correctly.
 463                  */
 464                 if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt + count) < *len))
 465                 {
 466                         /* The compiler will struggle a bit with constant propagation and
 467                          * aliasing, so we help it by showing that these values do not
 468                          * change inside the loop
 469                          */
 470                         int i;
 471                         char *buf = gdb_con->buf_p;
 472                         int run = gdb_con->buf_cnt - 2;
 473                         i = 0;
 474                         int done = 0;
 475                         while (i < run)
 476                         {
 477                                 character = *buf++;
 478                                 i++;
 479                                 if (character == '#')
 480                                 {
 481                                         /* Danger! character can be '#' when esc is
 482                                          * used so we need an explicit boolean for done here.
 483                                          */
 484                                         done = 1;
 485                                         break;
 486                                 }
 487
 488                                 if (character == '}')
 489                                 {
 490                                         /* data transmitted in binary mode (X packet)
 491                                          * uses 0x7d as escape character */
 492                                         my_checksum += character & 0xff;
 493                                         character = *buf++;
 494                                         i++;
 495                                         my_checksum += character & 0xff;
 496                                         buffer[count++] = (character ^ 0x20) & 0xff;
 497                                 }
 498                                 else
 499                                 {
 500                                         my_checksum += character & 0xff;
 501                                         buffer[count++] = character & 0xff;
 502                                 }
 503                         }
 504                         gdb_con->buf_p += i;
 505                         gdb_con->buf_cnt -= i;
 506                         if (done)
 507                                 break;
 508                 }
 509                 if (count > *len)
 510                 {
 511                         LOG_ERROR("packet buffer too small");
 512                         return ERROR_GDB_BUFFER_TOO_SMALL;
 513                 }
 514
 515                 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 516                         return retval;
 517
 518                 if (character == '#')
 519                         break;
 520
 521                 if (character == '}')
 522                 {
 523                         /* data transmitted in binary mode (X packet)
 524                          * uses 0x7d as escape character */
 525                         my_checksum += character & 0xff;
 526                         if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 527                                 return retval;
 528                         my_checksum += character & 0xff;
 529                         buffer[count++] = (character ^ 0x20) & 0xff;
 530                 }
 531                 else
 532                 {
 533                         my_checksum += character & 0xff;
 534                         buffer[count++] = character & 0xff;
 535                 }
 536         }
 537
 538         *len = count;
 539
 540         if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 541                 return retval;
 542         checksum[0] = character;
 543         if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 544                 return retval;
 545         checksum[1] = character;
 546         checksum[2] = 0;
 547
 548         if (!noack)
 549         {
 550                 *checksum_ok = (my_checksum == strtoul(checksum, NULL, 16));
 551         }
 552
 553         return ERROR_OK;
 554 }
 555
 556 int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len)
 557 {
 558         int character;
 559         int retval;
 560         gdb_connection_t *gdb_con = connection->priv;
 561
 562         while (1)
 563         {
 564                 do
 565                 {
 566                         if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
 567                                 return retval;
 568
 569 #ifdef _DEBUG_GDB_IO_
 570                         LOG_DEBUG("character: '%c'", character);
 571 #endif
 572
 573                         switch (character)
 574                         {
 575                                 case '$':
 576                                         break;
 577                                 case '+':
 578                                         /* gdb sends a dummy ack '+' at every remote connect - see remote_start_remote (remote.c)
 579                                          * incase anyone tries to debug why they receive this warning every time */
 580                                         LOG_WARNING("acknowledgment received, but no packet pending");
 581                                         break;
 582                                 case '-':
 583                                         LOG_WARNING("negative acknowledgment, but no packet pending");
 584                                         break;
 585                                 case 0x3:
 586                                         gdb_con->ctrl_c = 1;
 587                                         *len = 0;
 588                                         return ERROR_OK;
 589                                 default:
 590                                         LOG_WARNING("ignoring character 0x%x", character);
 591                                         break;
 592                         }
 593                 } while (character != '$');
 594
 595
 596
 597                 int checksum_ok = 0;
 598                 /* explicit code expansion here to get faster inlined code in -O3 by not
 599                  * calculating checksum
 600                  */
 601                 if (gdb_con->noack_mode)
 602                 {
 603                         if ((retval = fetch_packet(connection, &checksum_ok, 1, len, buffer)) != ERROR_OK)
 604                                 return retval;
 605                 } else
 606                 {
 607                         if ((retval = fetch_packet(connection, &checksum_ok, 0, len, buffer)) != ERROR_OK)
 608                                 return retval;
 609                 }
 610
 611                 if (gdb_con->noack_mode)
 612                 {
 613                         /* checksum is not checked in noack mode */
 614                         break;
 615                 }
 616                 if (checksum_ok)
 617                 {
 618                         if ((retval = gdb_write(connection, "+", 1)) != ERROR_OK)
 619                         {
 620                                 return retval;
 621                         }
 622                         break;
 623                 }
 624         }
 625         if (gdb_con->closed)
 626                 return ERROR_SERVER_REMOTE_CLOSED;
 627
 628         return ERROR_OK;
 629 }
 630
 631 int gdb_get_packet(connection_t *connection, char *buffer, int *len)
 632 {
 633         gdb_connection_t *gdb_con = connection->priv;
 634         gdb_con->busy = 1;
 635         int retval = gdb_get_packet_inner(connection, buffer, len);
 636         gdb_con->busy = 0;
 637         return retval;
 638 }
 639
 640 int gdb_output_con(connection_t *connection, const char* line)
 641 {
 642         char *hex_buffer;
 643         int i, bin_size;
 644
 645         bin_size = strlen(line);
 646
 647         hex_buffer = malloc(bin_size*2 + 2);
 648         if (hex_buffer == NULL)
 649                 return ERROR_GDB_BUFFER_TOO_SMALL;
 650
 651         hex_buffer[0] = 'O';
 652         for (i = 0; i < bin_size; i++)
 653                 snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
 654         hex_buffer[bin_size*2 + 1] = 0;
 655
 656         int retval = gdb_put_packet(connection, hex_buffer, bin_size*2 + 1);
 657
 658         free(hex_buffer);
 659         return retval;
 660 }
 661
 662 int gdb_output(struct command_context_s *context, const char* line)
 663 {
 664         /* this will be dumped to the log and also sent as an O packet if possible */
 665         LOG_USER_N("%s", line);
 666         return ERROR_OK;
 667 }
 668
 669
 670 static void gdb_frontend_halted(struct target_s *target, connection_t *connection)
 671 {
 672         gdb_connection_t *gdb_connection = connection->priv;
 673
 674         /* In the GDB protocol when we are stepping or continuing execution,
 675          * we have a lingering reply. Upon receiving a halted event
 676          * when we have that lingering packet, we reply to the original
 677          * step or continue packet.
 678          *
 679          * Executing monitor commands can bring the target in and
 680          * out of the running state so we'll see lots of TARGET_EVENT_XXX
 681          * that are to be ignored.
 682          */
 683         if (gdb_connection->frontend_state == TARGET_RUNNING)
 684         {
 685                 char sig_reply[4];
 686                 int signal;
 687
 688                 /* stop forwarding log packets! */
 689                 log_remove_callback(gdb_log_callback, connection);
 690
 691                 if (gdb_connection->ctrl_c)
 692                 {
 693                         signal = 0x2;
 694                         gdb_connection->ctrl_c = 0;
 695                 }
 696                 else
 697                 {
 698                         signal = gdb_last_signal(target);
 699                 }
 700
 701                 snprintf(sig_reply, 4, "T%2.2x", signal);
 702                 gdb_put_packet(connection, sig_reply, 3);
 703                 gdb_connection->frontend_state = TARGET_HALTED;
 704         }
 705 }
 706
 707 int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
 708 {
 709         int retval;
 710         connection_t *connection = priv;
 711
 712         target_handle_event(target, event);
 713         switch (event)
 714         {
 715                 case TARGET_EVENT_EARLY_HALTED:
 716                         gdb_frontend_halted(target, connection);
 717                         break;
 718                 case TARGET_EVENT_HALTED:
 719                         target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
 720                         break;
 721                 case TARGET_EVENT_GDB_FLASH_ERASE_START:
 722                         target_handle_event(target, TARGET_EVENT_OLD_gdb_program_config);
 723                         if ((retval = jtag_execute_queue()) != ERROR_OK)
 724                         {
 725                                 return retval;
 726                         }
 727                         break;
 728                 default:
 729                         break;
 730         }
 731
 732         return ERROR_OK;
 733 }
 734
 735 int gdb_new_connection(connection_t *connection)
 736 {
 737         gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t));
 738         gdb_service_t *gdb_service = connection->service->priv;
 739         int retval;
 740         int initial_ack;
 741
 742         connection->priv = gdb_connection;
 743
 744         /* initialize gdb connection information */
 745         gdb_connection->buf_p = gdb_connection->buffer;
 746         gdb_connection->buf_cnt = 0;
 747         gdb_connection->ctrl_c = 0;
 748         gdb_connection->frontend_state = TARGET_HALTED;
 749         gdb_connection->vflash_image = NULL;
 750         gdb_connection->closed = 0;
 751         gdb_connection->busy = 0;
 752         gdb_connection->noack_mode = 0;
 753
 754         /* send ACK to GDB for debug request */
 755         gdb_write(connection, "+", 1);
 756
 757         /* output goes through gdb connection */
 758         command_set_output_handler(connection->cmd_ctx, gdb_output, connection);
 759
 760         /* we must remove all breakpoints registered to the target as a previous
 761          * GDB session could leave dangling breakpoints if e.g. communication
 762          * timed out.
 763          */
 764         breakpoint_clear_target(gdb_service->target);
 765         watchpoint_clear_target(gdb_service->target);
 766
 767         /* register callback to be informed about target events */
 768         target_register_event_callback(gdb_target_callback_event_handler, connection);
 769
 770         /* a gdb session just attached, try to put the target in halt mode.
 771          *
 772          * DANGER!!!!
 773          *
 774          * If the halt fails(e.g. target needs a reset, JTAG communication not
 775          * working, etc.), then the GDB connect will succeed as
 776          * the get_gdb_reg_list() will lie and return a register list with
 777          * dummy values.
 778          *
 779          * This allows GDB monitor commands to be run from a GDB init script to
 780          * initialize the target
 781          *
 782          * Also, since the halt() is asynchronous target connect will be
 783          * instantaneous and thus avoiding annoying timeout problems during
 784          * connect.
 785          */
 786         target_halt(gdb_service->target);
 787         /* FIX!!!! could extended-remote work better here?
 788          *
 789          *  wait a tiny bit for halted state or we just continue. The
 790          * GDB register packet will then contain garbage
 791          */
 792         target_wait_state(gdb_service->target, TARGET_HALTED, 500);
 793
 794         /* remove the initial ACK from the incoming buffer */
 795         if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
 796                 return retval;
 797
 798         /* FIX!!!??? would we actually ever receive a + here???
 799          * Not observed.
 800          */
 801         if (initial_ack != '+')
 802                 gdb_putback_char(connection, initial_ack);
 803         target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);
 804
 805         gdb_actual_connections++;
 806         LOG_DEBUG("New GDB Connection: %d, Target %s, state: %s",
 807                   gdb_actual_connections,
 808                   gdb_service->target->cmd_name,
 809                   target_state_name(gdb_service->target));
 810
 811         return ERROR_OK;
 812 }
 813
 814 int gdb_connection_closed(connection_t *connection)
 815 {
 816         gdb_service_t *gdb_service = connection->service->priv;
 817         gdb_connection_t *gdb_connection = connection->priv;
 818
 819         /* we're done forwarding messages. Tear down callback before
 820          * cleaning up connection.
 821          */
 822         log_remove_callback(gdb_log_callback, connection);
 823
 824         gdb_actual_connections--;
 825         LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d",
 826                   gdb_service->target->cmd_name,
 827                   target_state_name(gdb_service->target),
 828                   gdb_actual_connections);
 829
 830         /* see if an image built with vFlash commands is left */
 831         if (gdb_connection->vflash_image)
 832         {
 833                 image_close(gdb_connection->vflash_image);
 834                 free(gdb_connection->vflash_image);
 835                 gdb_connection->vflash_image = NULL;
 836         }
 837
 838         /* if this connection registered a debug-message receiver delete it */
 839         delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
 840
 841         if (connection->priv)
 842         {
 843                 free(connection->priv);
 844                 connection->priv = NULL;
 845         }
 846         else
 847         {
 848                 LOG_ERROR("BUG: connection->priv == NULL");
 849         }
 850
 851
 852         target_unregister_event_callback(gdb_target_callback_event_handler, connection);
 853
 854         target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);
 855
 856         target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
 857
 858         return ERROR_OK;
 859 }
 860
 861 void gdb_send_error(connection_t *connection, uint8_t the_error)
 862 {
 863         char err[4];
 864         snprintf(err, 4, "E%2.2X", the_error);
 865         gdb_put_packet(connection, err, 3);
 866 }
 867
 868 int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
 869 {
 870         char sig_reply[4];
 871         int signal;
 872
 873         signal = gdb_last_signal(target);
 874
 875         snprintf(sig_reply, 4, "S%2.2x", signal);
 876         gdb_put_packet(connection, sig_reply, 3);
 877
 878         return ERROR_OK;
 879 }
 880
 881 static int gdb_reg_pos(target_t *target, int pos, int len)
 882 {
 883         if (target->endianness == TARGET_LITTLE_ENDIAN)
 884                 return pos;
 885         else
 886                 return len - 1 - pos;
 887 }
 888
 889 /* Convert register to string of bytes. NB! The # of bits in the
 890  * register might be non-divisible by 8(a byte), in which
 891  * case an entire byte is shown.
 892  *
 893  * NB! the format on the wire is the target endianess
 894  *
 895  * The format of reg->value is little endian
 896  *
 897  */
 898 void gdb_str_to_target(target_t *target, char *tstr, reg_t *reg)
 899 {
 900         int i;
 901
 902         uint8_t *buf;
 903         int buf_len;
 904         buf = reg->value;
 905         buf_len = CEIL(reg->size, 8);
 906
 907         for (i = 0; i < buf_len; i++)
 908         {
 909                 int j = gdb_reg_pos(target, i, buf_len);
 910                 tstr[i*2]   = DIGITS[(buf[j]>>4) & 0xf];
 911                 tstr[i*2 + 1] = DIGITS[buf[j]&0xf];
 912         }
 913 }
 914
 915 static int hextoint(char c)
 916 {
 917         if (c>='0'&&c<='9')
 918         {
 919                 return c-'0';
 920         }
 921         c = toupper(c);
 922         if (c>='A'&&c<='F')
 923         {
 924                 return c-'A'+10;
 925         }
 926         LOG_ERROR("BUG: invalid register value %08x", c);
 927         return 0;
 928 }
 929
 930 /* copy over in register buffer */
 931 void gdb_target_to_reg(target_t *target, char *tstr, int str_len, uint8_t *bin)
 932 {
 933         if (str_len % 2)
 934         {
 935                 LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
 936                 exit(-1);
 937         }
 938
 939         int i;
 940         for (i = 0; i < str_len; i += 2)
 941         {
 942                 uint8_t t = hextoint(tstr[i]) << 4;
 943                 t |= hextoint(tstr[i + 1]);
 944
 945                 int j = gdb_reg_pos(target, i/2, str_len/2);
 946                 bin[j] = t;
 947         }
 948 }
 949
 950 int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
 951 {
 952         reg_t **reg_list;
 953         int reg_list_size;
 954         int retval;
 955         int reg_packet_size = 0;
 956         char *reg_packet;
 957         char *reg_packet_p;
 958         int i;
 959
 960 #ifdef _DEBUG_GDB_IO_
 961         LOG_DEBUG("-");
 962 #endif
 963
 964         if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
 965         {
 966                 return gdb_error(connection, retval);
 967         }
 968
 969         for (i = 0; i < reg_list_size; i++)
 970         {
 971                 reg_packet_size += reg_list[i]->size;
 972         }
 973
 974         reg_packet = malloc(CEIL(reg_packet_size, 8) * 2);
 975         reg_packet_p = reg_packet;
 976
 977         for (i = 0; i < reg_list_size; i++)
 978         {
 979                 gdb_str_to_target(target, reg_packet_p, reg_list[i]);
 980                 reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
 981         }
 982
 983 #ifdef _DEBUG_GDB_IO_
 984         {
 985                 char *reg_packet_p;
 986                 reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2);
 987                 LOG_DEBUG("reg_packet: %s", reg_packet_p);
 988                 free(reg_packet_p);
 989         }
 990 #endif
 991
 992         gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2);
 993         free(reg_packet);
 994
 995         free(reg_list);
 996
 997         return ERROR_OK;
 998 }
 999
1000 int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1001 {
1002         int i;
1003         reg_t **reg_list;
1004         int reg_list_size;
1005         int retval;
1006         char *packet_p;
1007
1008 #ifdef _DEBUG_GDB_IO_
1009         LOG_DEBUG("-");
1010 #endif
1011
1012         /* skip command character */
1013         packet++;
1014         packet_size--;
1015
1016         if (packet_size % 2)
1017         {
1018                 LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection");
1019                 return ERROR_SERVER_REMOTE_CLOSED;
1020         }
1021
1022         if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1023         {
1024                 return gdb_error(connection, retval);
1025         }
1026
1027         packet_p = packet;
1028         for (i = 0; i < reg_list_size; i++)
1029         {
1030                 uint8_t *bin_buf;
1031                 int chars = (CEIL(reg_list[i]->size, 8) * 2);
1032
1033                 if (packet_p + chars > packet + packet_size)
1034                 {
1035                         LOG_ERROR("BUG: register packet is too small for registers");
1036                 }
1037
1038                 reg_arch_type_t *arch_type;
1039                 bin_buf = malloc(CEIL(reg_list[i]->size, 8));
1040                 gdb_target_to_reg(target, packet_p, chars, bin_buf);
1041
1042                 /* get register arch_type, and call set method */
1043                 arch_type = register_get_arch_type(reg_list[i]->arch_type);
1044
1045                 arch_type->set(reg_list[i], bin_buf);
1046
1047                 /* advance packet pointer */
1048                 packet_p += chars;
1049
1050
1051                 free(bin_buf);
1052         }
1053
1054         /* free reg_t *reg_list[] array allocated by get_gdb_reg_list */
1055         free(reg_list);
1056
1057         gdb_put_packet(connection, "OK", 2);
1058
1059         return ERROR_OK;
1060 }
1061
1062 int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1063 {
1064         char *reg_packet;
1065         int reg_num = strtoul(packet + 1, NULL, 16);
1066         reg_t **reg_list;
1067         int reg_list_size;
1068         int retval;
1069
1070 #ifdef _DEBUG_GDB_IO_
1071         LOG_DEBUG("-");
1072 #endif
1073
1074         if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1075         {
1076                 return gdb_error(connection, retval);
1077         }
1078
1079         if (reg_list_size <= reg_num)
1080         {
1081                 LOG_ERROR("gdb requested a non-existing register");
1082                 exit(-1);
1083         }
1084
1085         reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
1086
1087         gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
1088
1089         gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);
1090
1091         free(reg_list);
1092         free(reg_packet);
1093
1094         return ERROR_OK;
1095 }
1096
1097 int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1098 {
1099         char *separator;
1100         uint8_t *bin_buf;
1101         int reg_num = strtoul(packet + 1, &separator, 16);
1102         reg_t **reg_list;
1103         int reg_list_size;
1104         int retval;
1105         reg_arch_type_t *arch_type;
1106
1107         LOG_DEBUG("-");
1108
1109         if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1110         {
1111                 return gdb_error(connection, retval);
1112         }
1113
1114         if (reg_list_size < reg_num)
1115         {
1116                 LOG_ERROR("gdb requested a non-existing register");
1117                 return ERROR_SERVER_REMOTE_CLOSED;
1118         }
1119
1120         if (*separator != '=')
1121         {
1122                 LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
1123                 return ERROR_SERVER_REMOTE_CLOSED;
1124         }
1125
1126         /* convert from GDB-string (target-endian) to hex-string (big-endian) */
1127         bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8));
1128         int chars = (CEIL(reg_list[reg_num]->size, 8) * 2);
1129
1130         /* fix!!! add some sanity checks on packet size here */
1131
1132         gdb_target_to_reg(target, separator + 1, chars, bin_buf);
1133
1134                 /* get register arch_type, and call set method */
1135         arch_type = register_get_arch_type(reg_list[reg_num]->arch_type);
1136         arch_type->set(reg_list[reg_num], bin_buf);
1137
1138         gdb_put_packet(connection, "OK", 2);
1139
1140         free(bin_buf);
1141         free(reg_list);
1142
1143         return ERROR_OK;
1144 }
1145
1146 int gdb_error(connection_t *connection, int retval)
1147 {
1148         switch (retval)
1149         {
1150                 case ERROR_TARGET_DATA_ABORT:
1151                         gdb_send_error(connection, EIO);
1152                         break;
1153                 case ERROR_TARGET_TRANSLATION_FAULT:
1154                         gdb_send_error(connection, EFAULT);
1155                         break;
1156                 case ERROR_TARGET_UNALIGNED_ACCESS:
1157                         gdb_send_error(connection, EFAULT);
1158                         break;
1159                 case ERROR_TARGET_NOT_HALTED:
1160                         gdb_send_error(connection, EFAULT);
1161                         break;
1162                 default:
1163                         /* This could be that the target reset itself. */
1164                         LOG_ERROR("unexpected error %i", retval);
1165                         gdb_send_error(connection, EFAULT);
1166                         break;
1167         }
1168
1169         return ERROR_OK;
1170 }
1171
1172 /* We don't have to worry about the default 2 second timeout for GDB packets,
1173  * because GDB breaks up large memory reads into smaller reads.
1174  *
1175  * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
1176  */
1177 int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1178 {
1179         char *separator;
1180         uint32_t addr = 0;
1181         uint32_t len = 0;
1182
1183         uint8_t *buffer;
1184         char *hex_buffer;
1185
1186         int retval = ERROR_OK;
1187
1188         /* skip command character */
1189         packet++;
1190
1191         addr = strtoul(packet, &separator, 16);
1192
1193         if (*separator != ',')
1194         {
1195                 LOG_ERROR("incomplete read memory packet received, dropping connection");
1196                 return ERROR_SERVER_REMOTE_CLOSED;
1197         }
1198
1199         len = strtoul(separator + 1, NULL, 16);
1200
1201         buffer = malloc(len);
1202
1203         LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1204
1205         retval = target_read_buffer(target, addr, len, buffer);
1206
1207         if ((retval != ERROR_OK)&&!gdb_report_data_abort)
1208         {
1209                 /* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
1210                  * At some point this might be fixed in GDB, in which case this code can be removed.
1211                  *
1212                  * OpenOCD developers are acutely aware of this problem, but there is nothing
1213                  * gained by involving the user in this problem that hopefully will get resolved
1214                  * eventually
1215                  *
1216                  * http://sourceware.org/cgi-bin/gnatsweb.pl?cmd = view%20audit-trail&database = gdb&pr = 2395
1217                  *
1218                  * For now, the default is to fix up things to make current GDB versions work.
1219                  * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
1220                  */
1221                 memset(buffer, 0, len);
1222                 retval = ERROR_OK;
1223         }
1224
1225         if (retval == ERROR_OK)
1226         {
1227                 hex_buffer = malloc(len * 2 + 1);
1228
1229                 uint32_t i;
1230                 for (i = 0; i < len; i++)
1231                 {
1232                         uint8_t t = buffer[i];
1233                         hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
1234                         hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
1235                 }
1236
1237                 gdb_put_packet(connection, hex_buffer, len * 2);
1238
1239                 free(hex_buffer);
1240         }
1241         else
1242         {
1243                 retval = gdb_error(connection, retval);
1244         }
1245
1246         free(buffer);
1247
1248         return retval;
1249 }
1250
1251 int gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1252 {
1253         char *separator;
1254         uint32_t addr = 0;
1255         uint32_t len = 0;
1256
1257         uint8_t *buffer;
1258
1259         uint32_t i;
1260         int retval;
1261
1262         /* skip command character */
1263         packet++;
1264
1265         addr = strtoul(packet, &separator, 16);
1266
1267         if (*separator != ',')
1268         {
1269                 LOG_ERROR("incomplete write memory packet received, dropping connection");
1270                 return ERROR_SERVER_REMOTE_CLOSED;
1271         }
1272
1273         len = strtoul(separator + 1, &separator, 16);
1274
1275         if (*(separator++) != ':')
1276         {
1277                 LOG_ERROR("incomplete write memory packet received, dropping connection");
1278                 return ERROR_SERVER_REMOTE_CLOSED;
1279         }
1280
1281         buffer = malloc(len);
1282
1283         LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1284
1285         for (i = 0; i < len; i++)
1286         {
1287                 uint32_t tmp;
1288                 sscanf(separator + 2*i, "%2" SCNx32 , &tmp);
1289                 buffer[i] = tmp;
1290         }
1291
1292         retval = target_write_buffer(target, addr, len, buffer);
1293
1294         if (retval == ERROR_OK)
1295         {
1296                 gdb_put_packet(connection, "OK", 2);
1297         }
1298         else
1299         {
1300                 retval = gdb_error(connection, retval);
1301         }
1302
1303         free(buffer);
1304
1305         return retval;
1306 }
1307
1308 int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1309 {
1310         char *separator;
1311         uint32_t addr = 0;
1312         uint32_t len = 0;
1313
1314         int retval;
1315
1316         /* skip command character */
1317         packet++;
1318
1319         addr = strtoul(packet, &separator, 16);
1320
1321         if (*separator != ',')
1322         {
1323                 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1324                 return ERROR_SERVER_REMOTE_CLOSED;
1325         }
1326
1327         len = strtoul(separator + 1, &separator, 16);
1328
1329         if (*(separator++) != ':')
1330         {
1331                 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1332                 return ERROR_SERVER_REMOTE_CLOSED;
1333         }
1334
1335         retval = ERROR_OK;
1336         if (len)
1337         {
1338                 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1339
1340                 retval = target_write_buffer(target, addr, len, (uint8_t*)separator);
1341         }
1342
1343         if (retval == ERROR_OK)
1344         {
1345                 gdb_put_packet(connection, "OK", 2);
1346         }
1347         else
1348         {
1349                 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1350                         return retval;
1351         }
1352
1353         return ERROR_OK;
1354 }
1355
1356 int gdb_step_continue_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1357 {
1358         int current = 0;
1359         uint32_t address = 0x0;
1360         int retval = ERROR_OK;
1361
1362         LOG_DEBUG("-");
1363
1364         if (packet_size > 1)
1365         {
1366                 packet[packet_size] = 0;
1367                 address = strtoul(packet + 1, NULL, 16);
1368         }
1369         else
1370         {
1371                 current = 1;
1372         }
1373
1374         if (packet[0] == 'c')
1375         {
1376                 LOG_DEBUG("continue");
1377                 target_handle_event(target, TARGET_EVENT_OLD_pre_resume);
1378                 retval = target_resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
1379         }
1380         else if (packet[0] == 's')
1381         {
1382                 LOG_DEBUG("step");
1383                 /* step at current or address, don't handle breakpoints */
1384                 retval = target_step(target, current, address, 0);
1385         }
1386         return retval;
1387 }
1388
1389 int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1390 {
1391         int type;
1392         enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
1393         enum watchpoint_rw wp_type;
1394         uint32_t address;
1395         uint32_t size;
1396         char *separator;
1397         int retval;
1398
1399         LOG_DEBUG("-");
1400
1401         type = strtoul(packet + 1, &separator, 16);
1402
1403         if (type == 0)  /* memory breakpoint */
1404                 bp_type = BKPT_SOFT;
1405         else if (type == 1) /* hardware breakpoint */
1406                 bp_type = BKPT_HARD;
1407         else if (type == 2) /* write watchpoint */
1408                 wp_type = WPT_WRITE;
1409         else if (type == 3) /* read watchpoint */
1410                 wp_type = WPT_READ;
1411         else if (type == 4) /* access watchpoint */
1412                 wp_type = WPT_ACCESS;
1413
1414         if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT)||(bp_type == BKPT_HARD)))
1415         {
1416                 bp_type = gdb_breakpoint_override_type;
1417         }
1418
1419         if (*separator != ',')
1420         {
1421                 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1422                 return ERROR_SERVER_REMOTE_CLOSED;
1423         }
1424
1425         address = strtoul(separator + 1, &separator, 16);
1426
1427         if (*separator != ',')
1428         {
1429                 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1430                 return ERROR_SERVER_REMOTE_CLOSED;
1431         }
1432
1433         size = strtoul(separator + 1, &separator, 16);
1434
1435         switch (type)
1436         {
1437                 case 0:
1438                 case 1:
1439                         if (packet[0] == 'Z')
1440                         {
1441                                 if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK)
1442                                 {
1443                                         if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1444                                                 return retval;
1445                                 }
1446                                 else
1447                                 {
1448                                         gdb_put_packet(connection, "OK", 2);
1449                                 }
1450                         }
1451                         else
1452                         {
1453                                 breakpoint_remove(target, address);
1454                                 gdb_put_packet(connection, "OK", 2);
1455                         }
1456                         break;
1457                 case 2:
1458                 case 3:
1459                 case 4:
1460                 {
1461                         if (packet[0] == 'Z')
1462                         {
1463                                 if ((retval = watchpoint_add(target, address, size, type-2, 0, 0xffffffffu)) != ERROR_OK)
1464                                 {
1465                                         if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1466                                                 return retval;
1467                                 }
1468                                 else
1469                                 {
1470                                         gdb_put_packet(connection, "OK", 2);
1471                                 }
1472                         }
1473                         else
1474                         {
1475                                 watchpoint_remove(target, address);
1476                                 gdb_put_packet(connection, "OK", 2);
1477                         }
1478                         break;
1479                 }
1480                 default:
1481                         break;
1482         }
1483
1484         return ERROR_OK;
1485 }
1486
1487 /* print out a string and allocate more space as needed, mainly used for XML at this point */
1488 void xml_printf(int *retval, char **xml, int *pos, int *size, const char *fmt, ...)
1489 {
1490         if (*retval != ERROR_OK)
1491         {
1492                 return;
1493         }
1494         int first = 1;
1495
1496         for (;;)
1497         {
1498                 if ((*xml == NULL) || (!first))
1499                 {
1500                         /* start by 0 to exercise all the code paths.
1501                          * Need minimum 2 bytes to fit 1 char and 0 terminator. */
1502
1503                         *size = *size * 2 + 2;
1504                         char *t = *xml;
1505                         *xml = realloc(*xml, *size);
1506                         if (*xml == NULL)
1507                         {
1508                                 if (t)
1509                                         free(t);
1510                                 *retval = ERROR_SERVER_REMOTE_CLOSED;
1511                                 return;
1512                         }
1513                 }
1514
1515                 va_list ap;
1516                 int ret;
1517                 va_start(ap, fmt);
1518                 ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
1519                 va_end(ap);
1520                 if ((ret > 0) && ((ret + 1) < *size - *pos))
1521                 {
1522                         *pos += ret;
1523                         return;
1524                 }
1525                 /* there was just enough or not enough space, allocate more. */
1526                 first = 0;
1527         }
1528 }
1529
1530 static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len)
1531 {
1532         char *separator;
1533
1534         /* Extract and NUL-terminate the annex. */
1535         *annex = buf;
1536         while (*buf && *buf != ':')
1537                 buf++;
1538         if (*buf == '\0')
1539                 return -1;
1540         *buf++ = 0;
1541
1542         /* After the read marker and annex, qXfer looks like a
1543          * traditional 'm' packet. */
1544
1545         *ofs = strtoul(buf, &separator, 16);
1546
1547         if (*separator != ',')
1548                 return -1;
1549
1550         *len = strtoul(separator + 1, NULL, 16);
1551
1552         return 0;
1553 }
1554
1555 int gdb_calc_blocksize(flash_bank_t *bank)
1556 {
1557         uint32_t i;
1558         uint32_t block_size = 0xffffffff;
1559
1560         /* loop through all sectors and return smallest sector size */
1561
1562         for (i = 0; i < (uint32_t)bank->num_sectors; i++)
1563         {
1564                 if (bank->sectors[i].size < block_size)
1565                         block_size = bank->sectors[i].size;
1566         }
1567
1568         return block_size;
1569 }
1570
1571 static int compare_bank (const void * a, const void * b)
1572 {
1573         flash_bank_t *b1, *b2;
1574         b1=*((flash_bank_t **)a);
1575         b2=*((flash_bank_t **)b);
1576
1577         if (b1->base == b2->base)
1578         {
1579                 return 0;
1580         } else if (b1->base > b2->base)
1581         {
1582                 return 1;
1583         } else
1584         {
1585                 return -1;
1586         }
1587 }
1588
1589 int gdb_query_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1590 {
1591         command_context_t *cmd_ctx = connection->cmd_ctx;
1592         gdb_connection_t *gdb_connection = connection->priv;
1593
1594         if (strstr(packet, "qRcmd,"))
1595         {
1596                 if (packet_size > 6)
1597                 {
1598                         char *cmd;
1599                         int i;
1600                         cmd = malloc((packet_size - 6)/2 + 1);
1601                         for (i = 0; i < (packet_size - 6)/2; i++)
1602                         {
1603                                 uint32_t tmp;
1604                                 sscanf(packet + 6 + 2*i, "%2" SCNx32 , &tmp);
1605                                 cmd[i] = tmp;
1606                         }
1607                         cmd[(packet_size - 6)/2] = 0x0;
1608
1609                         /* We want to print all debug output to GDB connection */
1610                         log_add_callback(gdb_log_callback, connection);
1611                         target_call_timer_callbacks_now();
1612                         command_run_line(cmd_ctx, cmd);
1613                         target_call_timer_callbacks_now();
1614                         log_remove_callback(gdb_log_callback, connection);
1615                         free(cmd);
1616                 }
1617                 gdb_put_packet(connection, "OK", 2);
1618                 return ERROR_OK;
1619         }
1620         else if (strstr(packet, "qCRC:"))
1621         {
1622                 if (packet_size > 5)
1623                 {
1624                         int retval;
1625                         char gdb_reply[10];
1626                         char *separator;
1627                         uint32_t checksum;
1628                         uint32_t addr = 0;
1629                         uint32_t len = 0;
1630
1631                         /* skip command character */
1632                         packet += 5;
1633
1634                         addr = strtoul(packet, &separator, 16);
1635
1636                         if (*separator != ',')
1637                         {
1638                                 LOG_ERROR("incomplete read memory packet received, dropping connection");
1639                                 return ERROR_SERVER_REMOTE_CLOSED;
1640                         }
1641
1642                         len = strtoul(separator + 1, NULL, 16);
1643
1644                         retval = target_checksum_memory(target, addr, len, &checksum);
1645
1646                         if (retval == ERROR_OK)
1647                         {
1648                                 snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
1649                                 gdb_put_packet(connection, gdb_reply, 9);
1650                         }
1651                         else
1652                         {
1653                                 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1654                                         return retval;
1655                         }
1656
1657                         return ERROR_OK;
1658                 }
1659         }
1660         else if (strstr(packet, "qSupported"))
1661         {
1662                 /* we currently support packet size and qXfer:memory-map:read (if enabled)
1663                  * disable qXfer:features:read for the moment */
1664                 int retval = ERROR_OK;
1665                 char *buffer = NULL;
1666                 int pos = 0;
1667                 int size = 0;
1668
1669                 xml_printf(&retval, &buffer, &pos, &size,
1670                                 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-;QStartNoAckMode+",
1671                                 (GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-');
1672
1673                 if (retval != ERROR_OK)
1674                 {
1675                         gdb_send_error(connection, 01);
1676                         return ERROR_OK;
1677                 }
1678
1679                 gdb_put_packet(connection, buffer, strlen(buffer));
1680                 free(buffer);
1681
1682                 return ERROR_OK;
1683         }
1684         else if (strstr(packet, "qXfer:memory-map:read::") && (flash_get_bank_count() > 0))
1685         {
1686                 /* We get away with only specifying flash here. Regions that are not
1687                  * specified are treated as if we provided no memory map(if not we
1688                  * could detect the holes and mark them as RAM).
1689                  * Normally we only execute this code once, but no big deal if we
1690                  * have to regenerate it a couple of times. */
1691
1692                 flash_bank_t *p;
1693                 char *xml = NULL;
1694                 int size = 0;
1695                 int pos = 0;
1696                 int retval = ERROR_OK;
1697
1698                 int offset;
1699                 int length;
1700                 char *separator;
1701                 int blocksize;
1702
1703                 /* skip command character */
1704                 packet += 23;
1705
1706                 offset = strtoul(packet, &separator, 16);
1707                 length = strtoul(separator + 1, &separator, 16);
1708
1709                 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1710
1711                 /*
1712                 sort banks in ascending order, we need to make non-flash memory be ram(or rather
1713                 read/write) by default for GDB.
1714                 GDB does not have a concept of non-cacheable read/write memory.
1715                  */
1716                 flash_bank_t **banks = malloc(sizeof(flash_bank_t *)*flash_get_bank_count());
1717                 int i;
1718
1719                 for (i = 0; i < flash_get_bank_count(); i++)
1720                 {
1721                         p = get_flash_bank_by_num(i);
1722                         if (p == NULL)
1723                         {
1724                                 free(banks);
1725                                 retval = ERROR_FAIL;
1726                                 gdb_send_error(connection, retval);
1727                                 return retval;
1728                         }
1729                         banks[i]=p;
1730                 }
1731
1732                 qsort(banks, flash_get_bank_count(), sizeof(flash_bank_t *), compare_bank);
1733
1734                 uint32_t ram_start = 0;
1735                 for (i = 0; i < flash_get_bank_count(); i++)
1736                 {
1737                         p = banks[i];
1738
1739                         if (ram_start < p->base)
1740                         {
1741                                 xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
1742                                         ram_start, p->base-ram_start);
1743                         }
1744
1745                         /* if device has uneven sector sizes, eg. str7, lpc
1746                          * we pass the smallest sector size to gdb memory map */
1747                         blocksize = gdb_calc_blocksize(p);
1748
1749                         xml_printf(&retval, &xml, &pos, &size, "<memory type=\"flash\" start=\"0x%x\" length=\"0x%x\">\n" \
1750                                 "<property name=\"blocksize\">0x%x</property>\n" \
1751                                 "</memory>\n", \
1752                                 p->base, p->size, blocksize);
1753                         ram_start = p->base + p->size;
1754                 }
1755                 if (ram_start != 0)
1756                 {
1757                         xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
1758                                 ram_start, 0-ram_start);
1759                 } else
1760                 {
1761                         /* a flash chip could be at the very end of the 32 bit address space, in which case
1762                         ram_start will be precisely 0 */
1763                 }
1764
1765                 free(banks);
1766                 banks = NULL;
1767
1768                 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1769
1770                 if (retval != ERROR_OK)
1771                 {
1772                         gdb_send_error(connection, retval);
1773                         return retval;
1774                 }
1775
1776                 if (offset + length > pos)
1777                 {
1778                         length = pos - offset;
1779                 }
1780
1781                 char *t = malloc(length + 1);
1782                 t[0] = 'l';
1783                 memcpy(t + 1, xml + offset, length);
1784                 gdb_put_packet(connection, t, length + 1);
1785
1786                 free(t);
1787                 free(xml);
1788                 return ERROR_OK;
1789         }
1790         else if (strstr(packet, "qXfer:features:read:"))
1791         {
1792                 char *xml = NULL;
1793                 int size = 0;
1794                 int pos = 0;
1795                 int retval = ERROR_OK;
1796
1797                 int offset;
1798                 unsigned int length;
1799                 char *annex;
1800
1801                 /* skip command character */
1802                 packet += 20;
1803
1804                 if (decode_xfer_read(packet, &annex, &offset, &length) < 0)
1805                 {
1806                         gdb_send_error(connection, 01);
1807                         return ERROR_OK;
1808                 }
1809
1810                 if (strcmp(annex, "target.xml") != 0)
1811                 {
1812                         gdb_send_error(connection, 01);
1813                         return ERROR_OK;
1814                 }
1815
1816                 xml_printf(&retval, &xml, &pos, &size, \
1817                         "l < target version=\"1.0\">\n < architecture > arm</architecture>\n</target>\n");
1818
1819                 if (retval != ERROR_OK)
1820                 {
1821                         gdb_send_error(connection, retval);
1822                         return retval;
1823                 }
1824
1825                 gdb_put_packet(connection, xml, strlen(xml));
1826
1827                 free(xml);
1828                 return ERROR_OK;
1829         }
1830         else if (strstr(packet, "QStartNoAckMode"))
1831         {
1832                 gdb_connection->noack_mode = 1;
1833                 gdb_put_packet(connection, "OK", 2);
1834                 return ERROR_OK;
1835         }
1836
1837         gdb_put_packet(connection, "", 0);
1838         return ERROR_OK;
1839 }
1840
1841 int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
1842 {
1843         gdb_connection_t *gdb_connection = connection->priv;
1844         gdb_service_t *gdb_service = connection->service->priv;
1845         int result;
1846
1847         /* if flash programming disabled - send a empty reply */
1848
1849         if (gdb_flash_program == 0)
1850         {
1851                 gdb_put_packet(connection, "", 0);
1852                 return ERROR_OK;
1853         }
1854
1855         if (strstr(packet, "vFlashErase:"))
1856         {
1857                 unsigned long addr;
1858                 unsigned long length;
1859
1860                 char *parse = packet + 12;
1861                 if (*parse == '\0')
1862                 {
1863                         LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1864                         return ERROR_SERVER_REMOTE_CLOSED;
1865                 }
1866
1867                 addr = strtoul(parse, &parse, 16);
1868
1869                 if (*(parse++) != ',' || *parse == '\0')
1870                 {
1871                         LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1872                         return ERROR_SERVER_REMOTE_CLOSED;
1873                 }
1874
1875                 length = strtoul(parse, &parse, 16);
1876
1877                 if (*parse != '\0')
1878                 {
1879                         LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1880                         return ERROR_SERVER_REMOTE_CLOSED;
1881                 }
1882
1883                 /* assume all sectors need erasing - stops any problems
1884                  * when flash_write is called multiple times */
1885                 flash_set_dirty();
1886
1887                 /* perform any target specific operations before the erase */
1888                 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_ERASE_START);
1889                 result = flash_erase_address_range(gdb_service->target, addr, length);
1890                 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_ERASE_END);
1891
1892                 /* perform erase */
1893                 if (result != ERROR_OK)
1894                 {
1895                         /* GDB doesn't evaluate the actual error number returned,
1896                          * treat a failed erase as an I/O error
1897                          */
1898                         gdb_send_error(connection, EIO);
1899                         LOG_ERROR("flash_erase returned %i", result);
1900                 }
1901                 else
1902                         gdb_put_packet(connection, "OK", 2);
1903
1904                 return ERROR_OK;
1905         }
1906
1907         if (strstr(packet, "vFlashWrite:"))
1908         {
1909                 int retval;
1910                 unsigned long addr;
1911                 unsigned long length;
1912                 char *parse = packet + 12;
1913
1914                 if (*parse == '\0')
1915                 {
1916                         LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1917                         return ERROR_SERVER_REMOTE_CLOSED;
1918                 }
1919                 addr = strtoul(parse, &parse, 16);
1920                 if (*(parse++) != ':')
1921                 {
1922                         LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1923                         return ERROR_SERVER_REMOTE_CLOSED;
1924                 }
1925                 length = packet_size - (parse - packet);
1926
1927                 /* create a new image if there isn't already one */
1928                 if (gdb_connection->vflash_image == NULL)
1929                 {
1930                         gdb_connection->vflash_image = malloc(sizeof(image_t));
1931                         image_open(gdb_connection->vflash_image, "", "build");
1932                 }
1933
1934                 /* create new section with content from packet buffer */
1935                 if ((retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (uint8_t*)parse)) != ERROR_OK)
1936                 {
1937                         return retval;
1938                 }
1939
1940                 gdb_put_packet(connection, "OK", 2);
1941
1942                 return ERROR_OK;
1943         }
1944
1945         if (!strcmp(packet, "vFlashDone"))
1946         {
1947                 uint32_t written;
1948
1949                 /* process the flashing buffer. No need to erase as GDB
1950                  * always issues a vFlashErase first. */
1951                 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_START);
1952                 result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
1953                 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
1954                 if (result != ERROR_OK)
1955                 {
1956                         if (result == ERROR_FLASH_DST_OUT_OF_BANK)
1957                                 gdb_put_packet(connection, "E.memtype", 9);
1958                         else
1959                                 gdb_send_error(connection, EIO);
1960                         }
1961                 else
1962                 {
1963                         LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
1964                         gdb_put_packet(connection, "OK", 2);
1965                 }
1966
1967                 image_close(gdb_connection->vflash_image);
1968                 free(gdb_connection->vflash_image);
1969                 gdb_connection->vflash_image = NULL;
1970
1971                 return ERROR_OK;
1972         }
1973
1974         gdb_put_packet(connection, "", 0);
1975         return ERROR_OK;
1976 }
1977
1978 int gdb_detach(connection_t *connection, target_t *target)
1979 {
1980
1981         switch (detach_mode)
1982         {
1983                 case GDB_DETACH_RESUME:
1984                         target_handle_event(target, TARGET_EVENT_OLD_pre_resume);
1985                         target_resume(target, 1, 0, 1, 0);
1986                         break;
1987
1988                 case GDB_DETACH_RESET:
1989                         /* FIX?? make this configurable?? */
1990                         target_process_reset(connection->cmd_ctx, RESET_HALT);
1991                         break;
1992
1993                 case GDB_DETACH_HALT:
1994                         target_halt(target);
1995                         break;
1996
1997                 case GDB_DETACH_NOTHING:
1998                         break;
1999         }
2000
2001         gdb_put_packet(connection, "OK", 2);
2002         return ERROR_OK;
2003 }
2004
2005 static void gdb_log_callback(void *priv, const char *file, int line,
2006                 const char *function, const char *string)
2007 {
2008         connection_t *connection = priv;
2009         gdb_connection_t *gdb_con = connection->priv;
2010
2011         if (gdb_con->busy)
2012         {
2013                 /* do not reply this using the O packet */
2014                 return;
2015         }
2016
2017         gdb_output_con(connection, string);
2018 }
2019
2020 /* Do not allocate this on the stack */
2021 char gdb_packet_buffer[GDB_BUFFER_SIZE];
2022
2023 static void gdb_sig_halted(connection_t *connection)
2024 {
2025         char sig_reply[4];
2026         snprintf(sig_reply, 4, "T%2.2x", 2);
2027         gdb_put_packet(connection, sig_reply, 3);
2028
2029 }
2030
2031 int gdb_input_inner(connection_t *connection)
2032 {
2033         gdb_service_t *gdb_service = connection->service->priv;
2034         target_t *target = gdb_service->target;
2035         char *packet = gdb_packet_buffer;
2036         int packet_size;
2037         int retval;
2038         gdb_connection_t *gdb_con = connection->priv;
2039         static int extended_protocol = 0;
2040
2041         /* drain input buffer */
2042         do
2043         {
2044                 packet_size = GDB_BUFFER_SIZE-1;
2045                 if ((retval = gdb_get_packet(connection, packet, &packet_size)) != ERROR_OK)
2046                 {
2047                         return retval;
2048                 }
2049
2050                 /* terminate with zero */
2051                 packet[packet_size] = 0;
2052
2053                 if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
2054                         if (packet[0] == 'X') {
2055                                 // binary packets spew junk into the debug log stream
2056                                 char buf[ 50 ];
2057                                 int x;
2058                                 for (x = 0 ; (x < 49) && (packet[x] != ':') ; x++) {
2059                                         buf[x] = packet[x];
2060                                 }
2061                                 buf[x] = 0;
2062                                 LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
2063                         } else {
2064                                 LOG_DEBUG("received packet: '%s'", packet);
2065                         }
2066                 }
2067
2068                 if (packet_size > 0)
2069                 {
2070                         retval = ERROR_OK;
2071                         switch (packet[0])
2072                         {
2073                                 case 'H':
2074                                         /* Hct... -- set thread
2075                                          * we don't have threads, send empty reply */
2076                                         gdb_put_packet(connection, NULL, 0);
2077                                         break;
2078                                 case 'q':
2079                                 case 'Q':
2080                                         retval = gdb_query_packet(connection, target, packet, packet_size);
2081                                         break;
2082                                 case 'g':
2083                                         retval = gdb_get_registers_packet(connection, target, packet, packet_size);
2084                                         break;
2085                                 case 'G':
2086                                         retval = gdb_set_registers_packet(connection, target, packet, packet_size);
2087                                         break;
2088                                 case 'p':
2089                                         retval = gdb_get_register_packet(connection, target, packet, packet_size);
2090                                         break;
2091                                 case 'P':
2092                                         retval = gdb_set_register_packet(connection, target, packet, packet_size);
2093                                         break;
2094                                 case 'm':
2095                                         retval = gdb_read_memory_packet(connection, target, packet, packet_size);
2096                                         break;
2097                                 case 'M':
2098                                         retval = gdb_write_memory_packet(connection, target, packet, packet_size);
2099                                         break;
2100                                 case 'z':
2101                                 case 'Z':
2102                                         retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
2103                                         break;
2104                                 case '?':
2105                                         gdb_last_signal_packet(connection, target, packet, packet_size);
2106                                         break;
2107                                 case 'c':
2108                                 case 's':
2109                                         {
2110                                                 if (target->state != TARGET_HALTED)
2111                                                 {
2112                                                         /* If the target isn't in the halted state, then we can't
2113                                                          * step/continue. This might be early setup, etc.
2114                                                          */
2115                                                         gdb_sig_halted(connection);
2116                                                 } else
2117                                                 {
2118                                                         /* We're running/stepping, in which case we can
2119                                                          * forward log output until the target is halted
2120                                                          */
2121                                                         gdb_connection_t *gdb_con = connection->priv;
2122                                                         gdb_con->frontend_state = TARGET_RUNNING;
2123                                                         log_add_callback(gdb_log_callback, connection);
2124                                                         target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
2125                                                         int retval = gdb_step_continue_packet(connection, target, packet, packet_size);
2126                                                         if (retval != ERROR_OK)
2127                                                         {
2128                                                                 /* we'll never receive a halted condition... issue a false one.. */
2129                                                                 gdb_frontend_halted(target, connection);
2130                                                         }
2131                                                 }
2132                                         }
2133                                         break;
2134                                 case 'v':
2135                                         retval = gdb_v_packet(connection, target, packet, packet_size);
2136                                         break;
2137                                 case 'D':
2138                                         retval = gdb_detach(connection, target);
2139                                         extended_protocol = 0;
2140                                         break;
2141                                 case 'X':
2142                                         if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK)
2143                                                 return retval;
2144                                         break;
2145                                 case 'k':
2146                                         if (extended_protocol != 0)
2147                                                 break;
2148                                         gdb_put_packet(connection, "OK", 2);
2149                                         return ERROR_SERVER_REMOTE_CLOSED;
2150                                 case '!':
2151                                         /* handle extended remote protocol */
2152                                         extended_protocol = 1;
2153                                         gdb_put_packet(connection, "OK", 2);
2154                                         break;
2155                                 case 'R':
2156                                         /* handle extended restart packet */
2157                                         breakpoint_clear_target(gdb_service->target);
2158                                         watchpoint_clear_target(gdb_service->target);
2159                                         command_run_linef(connection->cmd_ctx,
2160                                                         "ocd_gdb_restart %s",
2161                                                         target->cmd_name);
2162                                         break;
2163                                 default:
2164                                         /* ignore unkown packets */
2165                                         LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
2166                                         gdb_put_packet(connection, NULL, 0);
2167                                         break;
2168                         }
2169
2170                         /* if a packet handler returned an error, exit input loop */
2171                         if (retval != ERROR_OK)
2172                                 return retval;
2173                 }
2174
2175                 if (gdb_con->ctrl_c)
2176                 {
2177                         if (target->state == TARGET_RUNNING)
2178                         {
2179                                 target_halt(target);
2180                                 gdb_con->ctrl_c = 0;
2181                         }
2182                 }
2183
2184         } while (gdb_con->buf_cnt > 0);
2185
2186         return ERROR_OK;
2187 }
2188
2189 int gdb_input(connection_t *connection)
2190 {
2191         int retval = gdb_input_inner(connection);
2192         gdb_connection_t *gdb_con = connection->priv;
2193         if (retval == ERROR_SERVER_REMOTE_CLOSED)
2194                 return retval;
2195
2196         /* logging does not propagate the error, yet can set the gdb_con->closed flag */
2197         if (gdb_con->closed)
2198                 return ERROR_SERVER_REMOTE_CLOSED;
2199
2200         /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
2201         return ERROR_OK;
2202 }
2203
2204 int gdb_init(void)
2205 {
2206         gdb_service_t *gdb_service;
2207         target_t *target = all_targets;
2208
2209         if (!target)
2210         {
2211                 LOG_WARNING("no gdb ports allocated as no target has been specified");
2212                 return ERROR_OK;
2213         }
2214
2215         if (gdb_port == 0 && server_use_pipes == 0)
2216         {
2217                 LOG_INFO("gdb port disabled");
2218                 return ERROR_OK;
2219         }
2220
2221         if (server_use_pipes)
2222         {
2223                 /* only a single gdb connection when using a pipe */
2224
2225                 gdb_service = malloc(sizeof(gdb_service_t));
2226                 gdb_service->target = target;
2227
2228                 add_service("gdb", CONNECTION_PIPE, 0, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service);
2229
2230                 LOG_DEBUG("gdb service for target %s using pipes",
2231                                 target_get_name(target));
2232         }
2233         else
2234         {
2235                 unsigned short port = gdb_port;
2236
2237                 while (target)
2238                 {
2239                         gdb_service = malloc(sizeof(gdb_service_t));
2240                         gdb_service->target = target;
2241
2242                         add_service("gdb", CONNECTION_TCP,
2243                                         port, 1,
2244                                         gdb_new_connection, gdb_input,
2245                                         gdb_connection_closed, gdb_service);
2246
2247                         LOG_DEBUG("gdb service for target %s at TCP port %i",
2248                                         target_get_name(target),
2249                                         port);
2250                         target = target->next;
2251                         port++;
2252                 }
2253         }
2254
2255         return ERROR_OK;
2256 }
2257
2258 /* daemon configuration command gdb_port */
2259 int handle_gdb_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
2260 {
2261         if (argc == 0)
2262         {
2263                 command_print(cmd_ctx, "%d", gdb_port);
2264                 return ERROR_OK;
2265         }
2266
2267         gdb_port = strtoul(args[0], NULL, 0);
2268
2269         return ERROR_OK;
2270 }
2271
2272 int handle_gdb_detach_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
2273 {
2274         if (argc == 1)
2275         {
2276                 if (strcmp(args[0], "resume") == 0)
2277                 {
2278                         detach_mode = GDB_DETACH_RESUME;
2279                         return ERROR_OK;
2280                 }
2281                 else if (strcmp(args[0], "reset") == 0)
2282                 {
2283                         detach_mode = GDB_DETACH_RESET;
2284                         return ERROR_OK;
2285                 }
2286                 else if (strcmp(args[0], "halt") == 0)
2287                 {
2288                         detach_mode = GDB_DETACH_HALT;
2289                         return ERROR_OK;
2290                 }
2291                 else if (strcmp(args[0], "nothing") == 0)
2292                 {
2293                         detach_mode = GDB_DETACH_NOTHING;
2294                         return ERROR_OK;
2295                 }
2296                 else
2297                         LOG_WARNING("invalid gdb_detach configuration directive: %s", args[0]);
2298         }
2299
2300         return ERROR_COMMAND_SYNTAX_ERROR;
2301 }
2302
2303 int handle_gdb_memory_map_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
2304 {
2305         if (argc == 1)
2306         {
2307                 if (strcmp(args[0], "enable") == 0)
2308                 {
2309                         gdb_use_memory_map = 1;
2310                         return ERROR_OK;
2311                 }
2312                 else if (strcmp(args[0], "disable") == 0)
2313                 {
2314                         gdb_use_memory_map = 0;
2315                         return ERROR_OK;
2316                 }
2317                 else
2318                         LOG_WARNING("invalid gdb_memory_map configuration directive %s", args[0]);
2319         }
2320
2321         return ERROR_COMMAND_SYNTAX_ERROR;
2322 }
2323
2324 int handle_gdb_flash_program_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
2325 {
2326         if (argc == 1)
2327         {
2328                 if (strcmp(args[0], "enable") == 0)
2329                 {
2330                         gdb_flash_program = 1;
2331                         return ERROR_OK;
2332                 }
2333                 else if (strcmp(args[0], "disable") == 0)
2334                 {
2335                         gdb_flash_program = 0;
2336                         return ERROR_OK;
2337                 }
2338                 else
2339                         LOG_WARNING("invalid gdb_flash_program configuration directive: %s", args[0]);
2340         }
2341
2342         return ERROR_COMMAND_SYNTAX_ERROR;
2343 }
2344
2345 int handle_gdb_report_data_abort_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
2346 {
2347         if (argc == 1)
2348         {
2349                 if (strcmp(args[0], "enable") == 0)
2350                 {
2351                         gdb_report_data_abort = 1;
2352                         return ERROR_OK;
2353                 }
2354                 else if (strcmp(args[0], "disable") == 0)
2355                 {
2356                         gdb_report_data_abort = 0;
2357                         return ERROR_OK;
2358                 }
2359                 else
2360                         LOG_WARNING("invalid gdb_report_data_abort configuration directive: %s", args[0]);
2361         }
2362
2363         return ERROR_COMMAND_SYNTAX_ERROR;
2364 }
2365
2366 /* gdb_breakpoint_override */
2367 int handle_gdb_breakpoint_override_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
2368 {
2369         if (argc == 0)
2370         {
2371
2372         } else if (argc == 1)
2373         {
2374                 gdb_breakpoint_override = 1;
2375                 if (strcmp(args[0], "hard") == 0)
2376                 {
2377                         gdb_breakpoint_override_type = BKPT_HARD;
2378                 } else if (strcmp(args[0], "soft") == 0)
2379                 {
2380                         gdb_breakpoint_override_type = BKPT_SOFT;
2381                 } else if (strcmp(args[0], "disable") == 0)
2382                 {
2383                         gdb_breakpoint_override = 0;
2384                 }
2385         } else
2386         {
2387                 return ERROR_COMMAND_SYNTAX_ERROR;
2388         }
2389         if (gdb_breakpoint_override)
2390         {
2391                 LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type == BKPT_HARD)?"hard":"soft");
2392         } else
2393         {
2394                 LOG_USER("breakpoint type is not overriden");
2395         }
2396
2397         return ERROR_OK;
2398 }
2399
2400 int gdb_register_commands(command_context_t *command_context)
2401 {
2402         register_command(command_context, NULL, "gdb_port", handle_gdb_port_command,
2403                         COMMAND_ANY, "daemon configuration command gdb_port");
2404         register_command(command_context, NULL, "gdb_detach", handle_gdb_detach_command,
2405                         COMMAND_CONFIG, "resume/reset/halt/nothing - "
2406                         "specify behavior when GDB detaches from the target");
2407         register_command(command_context, NULL, "gdb_memory_map", handle_gdb_memory_map_command,
2408                         COMMAND_CONFIG, "enable or disable memory map");
2409         register_command(command_context, NULL, "gdb_flash_program", handle_gdb_flash_program_command,
2410                         COMMAND_CONFIG, "enable or disable flash program");
2411         register_command(command_context, NULL, "gdb_report_data_abort", handle_gdb_report_data_abort_command,
2412                         COMMAND_CONFIG, "enable or disable reporting data aborts");
2413         register_command(command_context, NULL, "gdb_breakpoint_override", handle_gdb_breakpoint_override_command,
2414                         COMMAND_EXEC, "hard/soft/disable - force breakpoint type for gdb 'break' commands.");
2415         return ERROR_OK;
2416 }