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