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