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   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Broadcom Corporation                            *
   3  *   Evan Hunter - ehunter@broadcom.com                                    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  17  ***************************************************************************/
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include "rtos.h"
  24 #include "target/target.h"
  25 #include "helper/log.h"
  26 #include "helper/binarybuffer.h"
  27 #include "server/gdb_server.h"
  28
  29 /* RTOSs */
  30 extern struct rtos_type FreeRTOS_rtos;
  31 extern struct rtos_type ThreadX_rtos;
  32 extern struct rtos_type eCos_rtos;
  33 extern struct rtos_type Linux_os;
  34 extern struct rtos_type chibios_rtos;
  35 extern struct rtos_type chromium_ec_rtos;
  36 extern struct rtos_type embKernel_rtos;
  37 extern struct rtos_type mqx_rtos;
  38 extern struct rtos_type uCOS_III_rtos;
  39 extern struct rtos_type nuttx_rtos;
  40 extern struct rtos_type hwthread_rtos;
  41 extern struct rtos_type riot_rtos;
  42
  43 static struct rtos_type *rtos_types[] = {
  44         &ThreadX_rtos,
  45         &FreeRTOS_rtos,
  46         &eCos_rtos,
  47         &Linux_os,
  48         &chibios_rtos,
  49         &chromium_ec_rtos,
  50         &embKernel_rtos,
  51         &mqx_rtos,
  52         &uCOS_III_rtos,
  53         &nuttx_rtos,
  54         &riot_rtos,
  55         /* keep this as last, as it always matches with rtos auto */
  56         &hwthread_rtos,
  57         NULL
  58 };
  59
  60 int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
  61
  62 int rtos_smp_init(struct target *target)
  63 {
  64         if (target->rtos->type->smp_init)
  65                 return target->rtos->type->smp_init(target);
  66         return ERROR_TARGET_INIT_FAILED;
  67 }
  68
  69 static int rtos_target_for_threadid(struct connection *connection, int64_t threadid, struct target **t)
  70 {
  71         struct target *curr = get_target_from_connection(connection);
  72         if (t)
  73                 *t = curr;
  74
  75         return ERROR_OK;
  76 }
  77
  78 static int os_alloc(struct target *target, struct rtos_type *ostype)
  79 {
  80         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  81
  82         if (!os)
  83                 return JIM_ERR;
  84
  85         os->type = ostype;
  86         os->current_threadid = -1;
  87         os->current_thread = 0;
  88         os->symbols = NULL;
  89         os->target = target;
  90
  91         /* RTOS drivers can override the packet handler in _create(). */
  92         os->gdb_thread_packet = rtos_thread_packet;
  93         os->gdb_target_for_threadid = rtos_target_for_threadid;
  94
  95         return JIM_OK;
  96 }
  97
  98 static void os_free(struct target *target)
  99 {
 100         if (!target->rtos)
 101                 return;
 102
 103         if (target->rtos->symbols)
 104                 free(target->rtos->symbols);
 105
 106         free(target->rtos);
 107         target->rtos = NULL;
 108 }
 109
 110 static int os_alloc_create(struct target *target, struct rtos_type *ostype)
 111 {
 112         int ret = os_alloc(target, ostype);
 113
 114         if (JIM_OK == ret) {
 115                 ret = target->rtos->type->create(target);
 116                 if (ret != JIM_OK)
 117                         os_free(target);
 118         }
 119
 120         return ret;
 121 }
 122
 123 int rtos_create(Jim_GetOptInfo *goi, struct target *target)
 124 {
 125         int x;
 126         const char *cp;
 127         Jim_Obj *res;
 128         int e;
 129
 130         if (!goi->isconfigure && goi->argc != 0) {
 131                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 132                 return JIM_ERR;
 133         }
 134
 135         os_free(target);
 136
 137         e = Jim_GetOpt_String(goi, &cp, NULL);
 138         if (e != JIM_OK)
 139                 return e;
 140
 141         if (0 == strcmp(cp, "auto")) {
 142                 /* Auto detect tries to look up all symbols for each RTOS,
 143                  * and runs the RTOS driver's _detect() function when GDB
 144                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 145                 target->rtos_auto_detect = true;
 146
 147                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 148                  * target->rtos here, and set it to the first RTOS type. */
 149                 return os_alloc(target, rtos_types[0]);
 150         }
 151
 152         for (x = 0; rtos_types[x]; x++)
 153                 if (0 == strcmp(cp, rtos_types[x]->name))
 154                         return os_alloc_create(target, rtos_types[x]);
 155
 156         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 157         res = Jim_GetResult(goi->interp);
 158         for (x = 0; rtos_types[x]; x++)
 159                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 160         Jim_AppendStrings(goi->interp, res, " or auto", NULL);
 161
 162         return JIM_ERR;
 163 }
 164
 165 void rtos_destroy(struct target *target)
 166 {
 167         os_free(target);
 168 }
 169
 170 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 171 {
 172         struct target *target = get_target_from_connection(connection);
 173         if (target->rtos == NULL)
 174                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 175                                                                                  *found*/
 176         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 177 }
 178
 179 static symbol_table_elem_t *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 180 {
 181         symbol_table_elem_t *s;
 182
 183         if (!os->symbols)
 184                 os->type->get_symbol_list_to_lookup(&os->symbols);
 185
 186         if (!cur_symbol[0])
 187                 return &os->symbols[0];
 188
 189         for (s = os->symbols; s->symbol_name; s++)
 190                 if (!strcmp(s->symbol_name, cur_symbol)) {
 191                         s->address = cur_addr;
 192                         s++;
 193                         return s;
 194                 }
 195
 196         return NULL;
 197 }
 198
 199 /* searches for 'symbol' in the lookup table for 'os' and returns TRUE,
 200  * if 'symbol' is not declared optional */
 201 static bool is_symbol_mandatory(const struct rtos *os, const char *symbol)
 202 {
 203         for (symbol_table_elem_t *s = os->symbols; s->symbol_name; ++s) {
 204                 if (!strcmp(s->symbol_name, symbol))
 205                         return !s->optional;
 206         }
 207         return false;
 208 }
 209
 210 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 211  *
 212  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 213  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 214  *
 215  * If the qSymbol packet has no address that means GDB did not find the
 216  * symbol, in which case auto-detect will move on to try the next RTOS.
 217  *
 218  * rtos_qsymbol() then calls the next_symbol() helper function, which
 219  * iterates over symbol names for the current RTOS until it finds the
 220  * symbol in the received GDB packet, and then returns the next entry
 221  * in the list of symbols.
 222  *
 223  * If GDB replied about the last symbol for the RTOS and the RTOS was
 224  * specified explicitly, then no further symbol lookup is done. When
 225  * auto-detecting, the RTOS driver _detect() function must return success.
 226  *
 227  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 228  */
 229 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 230 {
 231         int rtos_detected = 0;
 232         uint64_t addr = 0;
 233         size_t reply_len;
 234         char reply[GDB_BUFFER_SIZE + 1], cur_sym[GDB_BUFFER_SIZE / 2 + 1] = ""; /* Extra byte for nul-termination */
 235         symbol_table_elem_t *next_sym = NULL;
 236         struct target *target = get_target_from_connection(connection);
 237         struct rtos *os = target->rtos;
 238
 239         reply_len = sprintf(reply, "OK");
 240
 241         if (!os)
 242                 goto done;
 243
 244         /* Decode any symbol name in the packet*/
 245         size_t len = unhexify((uint8_t *)cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 246         cur_sym[len] = 0;
 247
 248         if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
 249             (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr)) && /* GDB did not find an address for a symbol */
 250             is_symbol_mandatory(os, cur_sym)) {                                 /* the symbol is mandatory for this RTOS */
 251
 252                 /* GDB could not find an address for the previous symbol */
 253                 if (!target->rtos_auto_detect) {
 254                         LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 255                         goto done;
 256                 } else {
 257                         /* Autodetecting RTOS - try next RTOS */
 258                         if (!rtos_try_next(target)) {
 259                                 LOG_WARNING("No RTOS could be auto-detected!");
 260                                 goto done;
 261                         }
 262
 263                         /* Next RTOS selected - invalidate current symbol */
 264                         cur_sym[0] = '\x00';
 265                 }
 266         }
 267         next_sym = next_symbol(os, cur_sym, addr);
 268
 269         if (!next_sym->symbol_name) {
 270                 /* No more symbols need looking up */
 271
 272                 if (!target->rtos_auto_detect) {
 273                         rtos_detected = 1;
 274                         goto done;
 275                 }
 276
 277                 if (os->type->detect_rtos(target)) {
 278                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 279                         rtos_detected = 1;
 280                         goto done;
 281                 } else {
 282                         LOG_WARNING("No RTOS could be auto-detected!");
 283                         goto done;
 284                 }
 285         }
 286
 287         if (8 + (strlen(next_sym->symbol_name) * 2) + 1 > sizeof(reply)) {
 288                 LOG_ERROR("ERROR: RTOS symbol '%s' name is too long for GDB!", next_sym->symbol_name);
 289                 goto done;
 290         }
 291
 292         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 293         reply_len += hexify(reply + reply_len,
 294                 (const uint8_t *)next_sym->symbol_name, strlen(next_sym->symbol_name),
 295                 sizeof(reply) - reply_len);
 296
 297 done:
 298         gdb_put_packet(connection, reply, reply_len);
 299         return rtos_detected;
 300 }
 301
 302 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 303 {
 304         struct target *target = get_target_from_connection(connection);
 305
 306         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 307                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL) &&
 308                                 (target->rtos->thread_count != 0)) {
 309                         threadid_t threadid = 0;
 310                         int found = -1;
 311                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 312
 313                         if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 314                                 int thread_num;
 315                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 316                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 317                                                 if (target->rtos->thread_details[thread_num].exists)
 318                                                         found = thread_num;
 319                                         }
 320                                 }
 321                         }
 322                         if (found == -1) {
 323                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 324                                 return ERROR_OK;
 325                         }
 326
 327                         struct thread_detail *detail = &target->rtos->thread_details[found];
 328
 329                         int str_size = 0;
 330                         if (detail->thread_name_str != NULL)
 331                                 str_size += strlen(detail->thread_name_str);
 332                         if (detail->extra_info_str != NULL)
 333                                 str_size += strlen(detail->extra_info_str);
 334
 335                         char *tmp_str = calloc(str_size + 9, sizeof(char));
 336                         char *tmp_str_ptr = tmp_str;
 337
 338                         if (detail->thread_name_str != NULL)
 339                                 tmp_str_ptr += sprintf(tmp_str_ptr, "Name: %s", detail->thread_name_str);
 340                         if (detail->extra_info_str != NULL) {
 341                                 if (tmp_str_ptr != tmp_str)
 342                                         tmp_str_ptr += sprintf(tmp_str_ptr, ", ");
 343                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 344                         }
 345
 346                         assert(strlen(tmp_str) ==
 347                                 (size_t) (tmp_str_ptr - tmp_str));
 348
 349                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 350                         size_t pkt_len = hexify(hex_str, (const uint8_t *)tmp_str,
 351                                 strlen(tmp_str), strlen(tmp_str) * 2 + 1);
 352
 353                         gdb_put_packet(connection, hex_str, pkt_len);
 354                         free(hex_str);
 355                         free(tmp_str);
 356                         return ERROR_OK;
 357
 358                 }
 359                 gdb_put_packet(connection, "", 0);
 360                 return ERROR_OK;
 361         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 362                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 363                         if (target->rtos_auto_detect == true) {
 364                                 target->rtos_auto_detect = false;
 365                                 target->rtos->type->create(target);
 366                         }
 367                         target->rtos->type->update_threads(target->rtos);
 368                 }
 369                 return ERROR_OK;
 370         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 371                 int i;
 372                 if (target->rtos != NULL) {
 373                         if (target->rtos->thread_count == 0) {
 374                                 gdb_put_packet(connection, "l", 1);
 375                         } else {
 376                                 /*thread id are 16 char +1 for ',' */
 377                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 378                                 char *tmp_str = out_str;
 379                                 for (i = 0; i < target->rtos->thread_count; i++) {
 380                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 381                                                                                 target->rtos->thread_details[i].threadid);
 382                                 }
 383                                 gdb_put_packet(connection, out_str, strlen(out_str));
 384                                 free(out_str);
 385                         }
 386                 } else
 387                         gdb_put_packet(connection, "l", 1);
 388
 389                 return ERROR_OK;
 390         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 391                 gdb_put_packet(connection, "l", 1);
 392                 return ERROR_OK;
 393         } else if (strncmp(packet, "qAttached", 9) == 0) {
 394                 gdb_put_packet(connection, "1", 1);
 395                 return ERROR_OK;
 396         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 397                 char offsets[] = "Text=0;Data=0;Bss=0";
 398                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 399                 return ERROR_OK;
 400         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 401                 /* make sure we check this before "qC" packet below
 402                  * otherwise it gets incorrectly handled */
 403                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 404         } else if (strncmp(packet, "qC", 2) == 0) {
 405                 if (target->rtos != NULL) {
 406                         char buffer[19];
 407                         int size;
 408                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 409                         gdb_put_packet(connection, buffer, size);
 410                 } else
 411                         gdb_put_packet(connection, "QC0", 3);
 412                 return ERROR_OK;
 413         } else if (packet[0] == 'T') {  /* Is thread alive? */
 414                 threadid_t threadid;
 415                 int found = -1;
 416                 sscanf(packet, "T%" SCNx64, &threadid);
 417                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 418                         int thread_num;
 419                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 420                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 421                                         if (target->rtos->thread_details[thread_num].exists)
 422                                                 found = thread_num;
 423                                 }
 424                         }
 425                 }
 426                 if (found != -1)
 427                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 428                 else
 429                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 430                 return ERROR_OK;
 431         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 432                                          * all other operations ) */
 433                 if ((packet[1] == 'g') && (target->rtos != NULL)) {
 434                         threadid_t threadid;
 435                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 436                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 437                         /* threadid of 0 indicates target should choose */
 438                         if (threadid == 0)
 439                                 target->rtos->current_threadid = target->rtos->current_thread;
 440                         else
 441                                 target->rtos->current_threadid = threadid;
 442                 }
 443                 gdb_put_packet(connection, "OK", 2);
 444                 return ERROR_OK;
 445         }
 446
 447         return GDB_THREAD_PACKET_NOT_CONSUMED;
 448 }
 449
 450 static int rtos_put_gdb_reg_list(struct connection *connection,
 451                 struct rtos_reg *reg_list, int num_regs)
 452 {
 453         size_t num_bytes = 1; /* NUL */
 454         for (int i = 0; i < num_regs; ++i)
 455                 num_bytes += DIV_ROUND_UP(reg_list[i].size, 8) * 2;
 456
 457         char *hex = malloc(num_bytes);
 458         char *hex_p = hex;
 459
 460         for (int i = 0; i < num_regs; ++i) {
 461                 size_t count = DIV_ROUND_UP(reg_list[i].size, 8);
 462                 size_t n = hexify(hex_p, reg_list[i].value, count, num_bytes);
 463                 hex_p += n;
 464                 num_bytes -= n;
 465         }
 466
 467         gdb_put_packet(connection, hex, strlen(hex));
 468         free(hex);
 469
 470         return ERROR_OK;
 471 }
 472
 473 /** Look through all registers to find this register. */
 474 int rtos_get_gdb_reg(struct connection *connection, int reg_num)
 475 {
 476         struct target *target = get_target_from_connection(connection);
 477         int64_t current_threadid = target->rtos->current_threadid;
 478         if ((target->rtos != NULL) && (current_threadid != -1) &&
 479                         (current_threadid != 0) &&
 480                         ((current_threadid != target->rtos->current_thread) ||
 481                         (target->smp))) {       /* in smp several current thread are possible */
 482                 struct rtos_reg *reg_list;
 483                 int num_regs;
 484
 485                 LOG_DEBUG("getting register %d for thread 0x%" PRIx64
 486                                   ", target->rtos->current_thread=0x%" PRIx64,
 487                                                                                 reg_num,
 488                                                                                 current_threadid,
 489                                                                                 target->rtos->current_thread);
 490
 491                 int retval;
 492                 if (target->rtos->type->get_thread_reg) {
 493                         reg_list = calloc(1, sizeof(*reg_list));
 494                         num_regs = 1;
 495                         retval = target->rtos->type->get_thread_reg(target->rtos,
 496                                         current_threadid, reg_num, &reg_list[0]);
 497                         if (retval != ERROR_OK) {
 498                                 LOG_ERROR("RTOS: failed to get register %d", reg_num);
 499                                 return retval;
 500                         }
 501                 } else {
 502                         retval = target->rtos->type->get_thread_reg_list(target->rtos,
 503                                         current_threadid,
 504                                         &reg_list,
 505                                         &num_regs);
 506                         if (retval != ERROR_OK) {
 507                                 LOG_ERROR("RTOS: failed to get register list");
 508                                 return retval;
 509                         }
 510                 }
 511
 512                 for (int i = 0; i < num_regs; ++i) {
 513                         if (reg_list[i].number == (uint32_t)reg_num) {
 514                                 rtos_put_gdb_reg_list(connection, reg_list + i, 1);
 515                                 free(reg_list);
 516                                 return ERROR_OK;
 517                         }
 518                 }
 519
 520                 free(reg_list);
 521         }
 522         return ERROR_FAIL;
 523 }
 524
 525 /** Return a list of general registers. */
 526 int rtos_get_gdb_reg_list(struct connection *connection)
 527 {
 528         struct target *target = get_target_from_connection(connection);
 529         int64_t current_threadid = target->rtos->current_threadid;
 530         if ((target->rtos != NULL) && (current_threadid != -1) &&
 531                         (current_threadid != 0) &&
 532                         ((current_threadid != target->rtos->current_thread) ||
 533                         (target->smp))) {       /* in smp several current thread are possible */
 534                 struct rtos_reg *reg_list;
 535                 int num_regs;
 536
 537                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 538                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 539                                                                                 current_threadid,
 540                                                                                 target->rtos->current_thread);
 541
 542                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 543                                 current_threadid,
 544                                 &reg_list,
 545                                 &num_regs);
 546                 if (retval != ERROR_OK) {
 547                         LOG_ERROR("RTOS: failed to get register list");
 548                         return retval;
 549                 }
 550
 551                 rtos_put_gdb_reg_list(connection, reg_list, num_regs);
 552                 free(reg_list);
 553
 554                 return ERROR_OK;
 555         }
 556         return ERROR_FAIL;
 557 }
 558
 559 int rtos_set_reg(struct connection *connection, int reg_num,
 560                 uint8_t *reg_value)
 561 {
 562         struct target *target = get_target_from_connection(connection);
 563         int64_t current_threadid = target->rtos->current_threadid;
 564         if ((target->rtos != NULL) &&
 565                         (target->rtos->type->set_reg != NULL) &&
 566                         (current_threadid != -1) &&
 567                         (current_threadid != 0)) {
 568                 return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
 569         }
 570         return ERROR_FAIL;
 571 }
 572
 573 int rtos_generic_stack_read(struct target *target,
 574         const struct rtos_register_stacking *stacking,
 575         int64_t stack_ptr,
 576         struct rtos_reg **reg_list,
 577         int *num_regs)
 578 {
 579         int retval;
 580
 581         if (stack_ptr == 0) {
 582                 LOG_ERROR("Error: null stack pointer in thread");
 583                 return -5;
 584         }
 585         /* Read the stack */
 586         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 587         uint32_t address = stack_ptr;
 588
 589         if (stacking->stack_growth_direction == 1)
 590                 address -= stacking->stack_registers_size;
 591         retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 592         if (retval != ERROR_OK) {
 593                 free(stack_data);
 594                 LOG_ERROR("Error reading stack frame from thread");
 595                 return retval;
 596         }
 597         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 598
 599 #if 0
 600                 LOG_OUTPUT("Stack Data :");
 601                 for (i = 0; i < stacking->stack_registers_size; i++)
 602                         LOG_OUTPUT("%02X", stack_data[i]);
 603                 LOG_OUTPUT("\r\n");
 604 #endif
 605
 606         int64_t new_stack_ptr;
 607         if (stacking->calculate_process_stack != NULL) {
 608                 new_stack_ptr = stacking->calculate_process_stack(target,
 609                                 stack_data, stacking, stack_ptr);
 610         } else {
 611                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 612                         stacking->stack_registers_size;
 613         }
 614
 615         *reg_list = calloc(stacking->num_output_registers, sizeof(struct rtos_reg));
 616         *num_regs = stacking->num_output_registers;
 617
 618         for (int i = 0; i < stacking->num_output_registers; ++i) {
 619                 (*reg_list)[i].number = stacking->register_offsets[i].number;
 620                 (*reg_list)[i].size = stacking->register_offsets[i].width_bits;
 621
 622                 int offset = stacking->register_offsets[i].offset;
 623                 if (offset == -2)
 624                         buf_cpy(&new_stack_ptr, (*reg_list)[i].value, (*reg_list)[i].size);
 625                 else if (offset != -1)
 626                         buf_cpy(stack_data + offset, (*reg_list)[i].value, (*reg_list)[i].size);
 627         }
 628
 629         free(stack_data);
 630 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 631         return ERROR_OK;
 632 }
 633
 634 int rtos_try_next(struct target *target)
 635 {
 636         struct rtos *os = target->rtos;
 637         struct rtos_type **type = rtos_types;
 638
 639         if (!os)
 640                 return 0;
 641
 642         while (*type && os->type != *type)
 643                 type++;
 644
 645         if (!*type || !*(++type))
 646                 return 0;
 647
 648         os->type = *type;
 649         if (os->symbols) {
 650                 free(os->symbols);
 651                 os->symbols = NULL;
 652         }
 653
 654         return 1;
 655 }
 656
 657 int rtos_update_threads(struct target *target)
 658 {
 659         if ((target->rtos != NULL) && (target->rtos->type != NULL))
 660                 target->rtos->type->update_threads(target->rtos);
 661         return ERROR_OK;
 662 }
 663
 664 void rtos_free_threadlist(struct rtos *rtos)
 665 {
 666         if (rtos->thread_details) {
 667                 int j;
 668
 669                 for (j = 0; j < rtos->thread_count; j++) {
 670                         struct thread_detail *current_thread = &rtos->thread_details[j];
 671                         free(current_thread->thread_name_str);
 672                         free(current_thread->extra_info_str);
 673                 }
 674                 free(rtos->thread_details);
 675                 rtos->thread_details = NULL;
 676                 rtos->thread_count = 0;
 677                 rtos->current_threadid = -1;
 678                 rtos->current_thread = 0;
 679         }
 680 }