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