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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 extern struct rtos_type zephyr_rtos;
  43
  44 static struct rtos_type *rtos_types[] = {
  45         &ThreadX_rtos,
  46         &FreeRTOS_rtos,
  47         &eCos_rtos,
  48         &Linux_os,
  49         &chibios_rtos,
  50         &chromium_ec_rtos,
  51         &embKernel_rtos,
  52         &mqx_rtos,
  53         &uCOS_III_rtos,
  54         &nuttx_rtos,
  55         &riot_rtos,
  56         &zephyr_rtos,
  57         /* keep this as last, as it always matches with rtos auto */
  58         &hwthread_rtos,
  59         NULL
  60 };
  61
  62 static int rtos_try_next(struct target *target);
  63
  64 int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
  65
  66 int rtos_smp_init(struct target *target)
  67 {
  68         if (target->rtos->type->smp_init)
  69                 return target->rtos->type->smp_init(target);
  70         return ERROR_TARGET_INIT_FAILED;
  71 }
  72
  73 static int rtos_target_for_threadid(struct connection *connection, int64_t threadid, struct target **t)
  74 {
  75         struct target *curr = get_target_from_connection(connection);
  76         if (t)
  77                 *t = curr;
  78
  79         return ERROR_OK;
  80 }
  81
  82 static int os_alloc(struct target *target, struct rtos_type *ostype)
  83 {
  84         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  85
  86         if (!os)
  87                 return JIM_ERR;
  88
  89         os->type = ostype;
  90         os->current_threadid = -1;
  91         os->current_thread = 0;
  92         os->symbols = NULL;
  93         os->target = target;
  94
  95         /* RTOS drivers can override the packet handler in _create(). */
  96         os->gdb_thread_packet = rtos_thread_packet;
  97         os->gdb_target_for_threadid = rtos_target_for_threadid;
  98
  99         return JIM_OK;
 100 }
 101
 102 static void os_free(struct target *target)
 103 {
 104         if (!target->rtos)
 105                 return;
 106
 107         free(target->rtos->symbols);
 108         free(target->rtos);
 109         target->rtos = NULL;
 110 }
 111
 112 static int os_alloc_create(struct target *target, struct rtos_type *ostype)
 113 {
 114         int ret = os_alloc(target, ostype);
 115
 116         if (JIM_OK == ret) {
 117                 ret = target->rtos->type->create(target);
 118                 if (ret != JIM_OK)
 119                         os_free(target);
 120         }
 121
 122         return ret;
 123 }
 124
 125 int rtos_create(Jim_GetOptInfo *goi, struct target *target)
 126 {
 127         int x;
 128         const char *cp;
 129         Jim_Obj *res;
 130         int e;
 131
 132         if (!goi->isconfigure && goi->argc != 0) {
 133                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 134                 return JIM_ERR;
 135         }
 136
 137         os_free(target);
 138
 139         e = Jim_GetOpt_String(goi, &cp, NULL);
 140         if (e != JIM_OK)
 141                 return e;
 142
 143         if (0 == strcmp(cp, "auto")) {
 144                 /* Auto detect tries to look up all symbols for each RTOS,
 145                  * and runs the RTOS driver's _detect() function when GDB
 146                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 147                 target->rtos_auto_detect = true;
 148
 149                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 150                  * target->rtos here, and set it to the first RTOS type. */
 151                 return os_alloc(target, rtos_types[0]);
 152         }
 153
 154         for (x = 0; rtos_types[x]; x++)
 155                 if (0 == strcmp(cp, rtos_types[x]->name))
 156                         return os_alloc_create(target, rtos_types[x]);
 157
 158         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 159         res = Jim_GetResult(goi->interp);
 160         for (x = 0; rtos_types[x]; x++)
 161                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 162         Jim_AppendStrings(goi->interp, res, " or auto", NULL);
 163
 164         return JIM_ERR;
 165 }
 166
 167 void rtos_destroy(struct target *target)
 168 {
 169         os_free(target);
 170 }
 171
 172 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 173 {
 174         struct target *target = get_target_from_connection(connection);
 175         if (target->rtos == NULL)
 176                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 177                                                                                  *found*/
 178         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 179 }
 180
 181 static struct symbol_table_elem *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 182 {
 183         struct symbol_table_elem *s;
 184
 185         if (!os->symbols)
 186                 os->type->get_symbol_list_to_lookup(&os->symbols);
 187
 188         if (!cur_symbol[0])
 189                 return &os->symbols[0];
 190
 191         for (s = os->symbols; s->symbol_name; s++)
 192                 if (!strcmp(s->symbol_name, cur_symbol)) {
 193                         s->address = cur_addr;
 194                         s++;
 195                         return s;
 196                 }
 197
 198         return NULL;
 199 }
 200
 201 /* searches for 'symbol' in the lookup table for 'os' and returns TRUE,
 202  * if 'symbol' is not declared optional */
 203 static bool is_symbol_mandatory(const struct rtos *os, const char *symbol)
 204 {
 205         for (struct symbol_table_elem *s = os->symbols; s->symbol_name; ++s) {
 206                 if (!strcmp(s->symbol_name, symbol))
 207                         return !s->optional;
 208         }
 209         return false;
 210 }
 211
 212 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 213  *
 214  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 215  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 216  *
 217  * If the qSymbol packet has no address that means GDB did not find the
 218  * symbol, in which case auto-detect will move on to try the next RTOS.
 219  *
 220  * rtos_qsymbol() then calls the next_symbol() helper function, which
 221  * iterates over symbol names for the current RTOS until it finds the
 222  * symbol in the received GDB packet, and then returns the next entry
 223  * in the list of symbols.
 224  *
 225  * If GDB replied about the last symbol for the RTOS and the RTOS was
 226  * specified explicitly, then no further symbol lookup is done. When
 227  * auto-detecting, the RTOS driver _detect() function must return success.
 228  *
 229  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 230  */
 231 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 232 {
 233         int rtos_detected = 0;
 234         uint64_t addr = 0;
 235         size_t reply_len;
 236         char reply[GDB_BUFFER_SIZE + 1], cur_sym[GDB_BUFFER_SIZE / 2 + 1] = ""; /* Extra byte for null-termination */
 237         struct symbol_table_elem *next_sym = NULL;
 238         struct target *target = get_target_from_connection(connection);
 239         struct rtos *os = target->rtos;
 240
 241         reply_len = sprintf(reply, "OK");
 242
 243         if (!os)
 244                 goto done;
 245
 246         /* Decode any symbol name in the packet*/
 247         size_t len = unhexify((uint8_t *)cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 248         cur_sym[len] = 0;
 249
 250         if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
 251             (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr)) && /* GDB did not find an address for a symbol */
 252             is_symbol_mandatory(os, cur_sym)) {                                 /* the symbol is mandatory for this RTOS */
 253
 254                 /* GDB could not find an address for the previous symbol */
 255                 if (!target->rtos_auto_detect) {
 256                         LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 257                         goto done;
 258                 } else {
 259                         /* Autodetecting RTOS - try next RTOS */
 260                         if (!rtos_try_next(target)) {
 261                                 LOG_WARNING("No RTOS could be auto-detected!");
 262                                 goto done;
 263                         }
 264
 265                         /* Next RTOS selected - invalidate current symbol */
 266                         cur_sym[0] = '\x00';
 267                 }
 268         }
 269         next_sym = next_symbol(os, cur_sym, addr);
 270
 271         if (!next_sym->symbol_name) {
 272                 /* No more symbols need looking up */
 273
 274                 if (!target->rtos_auto_detect) {
 275                         rtos_detected = 1;
 276                         goto done;
 277                 }
 278
 279                 if (os->type->detect_rtos(target)) {
 280                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 281                         rtos_detected = 1;
 282                         goto done;
 283                 } else {
 284                         LOG_WARNING("No RTOS could be auto-detected!");
 285                         goto done;
 286                 }
 287         }
 288
 289         if (8 + (strlen(next_sym->symbol_name) * 2) + 1 > sizeof(reply)) {
 290                 LOG_ERROR("ERROR: RTOS symbol '%s' name is too long for GDB!", next_sym->symbol_name);
 291                 goto done;
 292         }
 293
 294         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 295         reply_len += hexify(reply + reply_len,
 296                 (const uint8_t *)next_sym->symbol_name, strlen(next_sym->symbol_name),
 297                 sizeof(reply) - reply_len);
 298
 299 done:
 300         gdb_put_packet(connection, reply, reply_len);
 301         return rtos_detected;
 302 }
 303
 304 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 305 {
 306         struct target *target = get_target_from_connection(connection);
 307
 308         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 309                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL) &&
 310                                 (target->rtos->thread_count != 0)) {
 311                         threadid_t threadid = 0;
 312                         int found = -1;
 313                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 314
 315                         if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 316                                 int thread_num;
 317                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 318                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 319                                                 if (target->rtos->thread_details[thread_num].exists)
 320                                                         found = thread_num;
 321                                         }
 322                                 }
 323                         }
 324                         if (found == -1) {
 325                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 326                                 return ERROR_OK;
 327                         }
 328
 329                         struct thread_detail *detail = &target->rtos->thread_details[found];
 330
 331                         int str_size = 0;
 332                         if (detail->thread_name_str != NULL)
 333                                 str_size += strlen(detail->thread_name_str);
 334                         if (detail->extra_info_str != NULL)
 335                                 str_size += strlen(detail->extra_info_str);
 336
 337                         char *tmp_str = calloc(str_size + 9, sizeof(char));
 338                         char *tmp_str_ptr = tmp_str;
 339
 340                         if (detail->thread_name_str != NULL)
 341                                 tmp_str_ptr += sprintf(tmp_str_ptr, "Name: %s", detail->thread_name_str);
 342                         if (detail->extra_info_str != NULL) {
 343                                 if (tmp_str_ptr != tmp_str)
 344                                         tmp_str_ptr += sprintf(tmp_str_ptr, ", ");
 345                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 346                         }
 347
 348                         assert(strlen(tmp_str) ==
 349                                 (size_t) (tmp_str_ptr - tmp_str));
 350
 351                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 352                         size_t pkt_len = hexify(hex_str, (const uint8_t *)tmp_str,
 353                                 strlen(tmp_str), strlen(tmp_str) * 2 + 1);
 354
 355                         gdb_put_packet(connection, hex_str, pkt_len);
 356                         free(hex_str);
 357                         free(tmp_str);
 358                         return ERROR_OK;
 359
 360                 }
 361                 gdb_put_packet(connection, "", 0);
 362                 return ERROR_OK;
 363         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 364                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 365                         if (target->rtos_auto_detect == true) {
 366                                 target->rtos_auto_detect = false;
 367                                 target->rtos->type->create(target);
 368                         }
 369                         target->rtos->type->update_threads(target->rtos);
 370                 }
 371                 return ERROR_OK;
 372         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 373                 int i;
 374                 if (target->rtos != NULL) {
 375                         if (target->rtos->thread_count == 0) {
 376                                 gdb_put_packet(connection, "l", 1);
 377                         } else {
 378                                 /*thread id are 16 char +1 for ',' */
 379                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 380                                 char *tmp_str = out_str;
 381                                 for (i = 0; i < target->rtos->thread_count; i++) {
 382                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 383                                                                                 target->rtos->thread_details[i].threadid);
 384                                 }
 385                                 gdb_put_packet(connection, out_str, strlen(out_str));
 386                                 free(out_str);
 387                         }
 388                 } else
 389                         gdb_put_packet(connection, "l", 1);
 390
 391                 return ERROR_OK;
 392         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 393                 gdb_put_packet(connection, "l", 1);
 394                 return ERROR_OK;
 395         } else if (strncmp(packet, "qAttached", 9) == 0) {
 396                 gdb_put_packet(connection, "1", 1);
 397                 return ERROR_OK;
 398         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 399                 char offsets[] = "Text=0;Data=0;Bss=0";
 400                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 401                 return ERROR_OK;
 402         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 403                 /* make sure we check this before "qC" packet below
 404                  * otherwise it gets incorrectly handled */
 405                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 406         } else if (strncmp(packet, "qC", 2) == 0) {
 407                 if (target->rtos != NULL) {
 408                         char buffer[19];
 409                         int size;
 410                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 411                         gdb_put_packet(connection, buffer, size);
 412                 } else
 413                         gdb_put_packet(connection, "QC0", 3);
 414                 return ERROR_OK;
 415         } else if (packet[0] == 'T') {  /* Is thread alive? */
 416                 threadid_t threadid;
 417                 int found = -1;
 418                 sscanf(packet, "T%" SCNx64, &threadid);
 419                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 420                         int thread_num;
 421                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 422                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 423                                         if (target->rtos->thread_details[thread_num].exists)
 424                                                 found = thread_num;
 425                                 }
 426                         }
 427                 }
 428                 if (found != -1)
 429                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 430                 else
 431                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 432                 return ERROR_OK;
 433         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 434                                          * all other operations ) */
 435                 if ((packet[1] == 'g') && (target->rtos != NULL)) {
 436                         threadid_t threadid;
 437                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 438                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 439                         /* threadid of 0 indicates target should choose */
 440                         if (threadid == 0)
 441                                 target->rtos->current_threadid = target->rtos->current_thread;
 442                         else
 443                                 target->rtos->current_threadid = threadid;
 444                 }
 445                 gdb_put_packet(connection, "OK", 2);
 446                 return ERROR_OK;
 447         }
 448
 449         return GDB_THREAD_PACKET_NOT_CONSUMED;
 450 }
 451
 452 static int rtos_put_gdb_reg_list(struct connection *connection,
 453                 struct rtos_reg *reg_list, int num_regs)
 454 {
 455         size_t num_bytes = 1; /* NUL */
 456         for (int i = 0; i < num_regs; ++i)
 457                 num_bytes += DIV_ROUND_UP(reg_list[i].size, 8) * 2;
 458
 459         char *hex = malloc(num_bytes);
 460         char *hex_p = hex;
 461
 462         for (int i = 0; i < num_regs; ++i) {
 463                 size_t count = DIV_ROUND_UP(reg_list[i].size, 8);
 464                 size_t n = hexify(hex_p, reg_list[i].value, count, num_bytes);
 465                 hex_p += n;
 466                 num_bytes -= n;
 467         }
 468
 469         gdb_put_packet(connection, hex, strlen(hex));
 470         free(hex);
 471
 472         return ERROR_OK;
 473 }
 474
 475 /** Look through all registers to find this register. */
 476 int rtos_get_gdb_reg(struct connection *connection, int reg_num)
 477 {
 478         struct target *target = get_target_from_connection(connection);
 479         int64_t current_threadid = target->rtos->current_threadid;
 480         if ((target->rtos != NULL) && (current_threadid != -1) &&
 481                         (current_threadid != 0) &&
 482                         ((current_threadid != target->rtos->current_thread) ||
 483                         (target->smp))) {       /* in smp several current thread are possible */
 484                 struct rtos_reg *reg_list;
 485                 int num_regs;
 486
 487                 LOG_DEBUG("getting register %d for thread 0x%" PRIx64
 488                                   ", target->rtos->current_thread=0x%" PRIx64,
 489                                                                                 reg_num,
 490                                                                                 current_threadid,
 491                                                                                 target->rtos->current_thread);
 492
 493                 int retval;
 494                 if (target->rtos->type->get_thread_reg) {
 495                         reg_list = calloc(1, sizeof(*reg_list));
 496                         num_regs = 1;
 497                         retval = target->rtos->type->get_thread_reg(target->rtos,
 498                                         current_threadid, reg_num, &reg_list[0]);
 499                         if (retval != ERROR_OK) {
 500                                 LOG_ERROR("RTOS: failed to get register %d", reg_num);
 501                                 return retval;
 502                         }
 503                 } else {
 504                         retval = target->rtos->type->get_thread_reg_list(target->rtos,
 505                                         current_threadid,
 506                                         &reg_list,
 507                                         &num_regs);
 508                         if (retval != ERROR_OK) {
 509                                 LOG_ERROR("RTOS: failed to get register list");
 510                                 return retval;
 511                         }
 512                 }
 513
 514                 for (int i = 0; i < num_regs; ++i) {
 515                         if (reg_list[i].number == (uint32_t)reg_num) {
 516                                 rtos_put_gdb_reg_list(connection, reg_list + i, 1);
 517                                 free(reg_list);
 518                                 return ERROR_OK;
 519                         }
 520                 }
 521
 522                 free(reg_list);
 523         }
 524         return ERROR_FAIL;
 525 }
 526
 527 /** Return a list of general registers. */
 528 int rtos_get_gdb_reg_list(struct connection *connection)
 529 {
 530         struct target *target = get_target_from_connection(connection);
 531         int64_t current_threadid = target->rtos->current_threadid;
 532         if ((target->rtos != NULL) && (current_threadid != -1) &&
 533                         (current_threadid != 0) &&
 534                         ((current_threadid != target->rtos->current_thread) ||
 535                         (target->smp))) {       /* in smp several current thread are possible */
 536                 struct rtos_reg *reg_list;
 537                 int num_regs;
 538
 539                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 540                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 541                                                                                 current_threadid,
 542                                                                                 target->rtos->current_thread);
 543
 544                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 545                                 current_threadid,
 546                                 &reg_list,
 547                                 &num_regs);
 548                 if (retval != ERROR_OK) {
 549                         LOG_ERROR("RTOS: failed to get register list");
 550                         return retval;
 551                 }
 552
 553                 rtos_put_gdb_reg_list(connection, reg_list, num_regs);
 554                 free(reg_list);
 555
 556                 return ERROR_OK;
 557         }
 558         return ERROR_FAIL;
 559 }
 560
 561 int rtos_set_reg(struct connection *connection, int reg_num,
 562                 uint8_t *reg_value)
 563 {
 564         struct target *target = get_target_from_connection(connection);
 565         int64_t current_threadid = target->rtos->current_threadid;
 566         if ((target->rtos != NULL) &&
 567                         (target->rtos->type->set_reg != NULL) &&
 568                         (current_threadid != -1) &&
 569                         (current_threadid != 0)) {
 570                 return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
 571         }
 572         return ERROR_FAIL;
 573 }
 574
 575 int rtos_generic_stack_read(struct target *target,
 576         const struct rtos_register_stacking *stacking,
 577         int64_t stack_ptr,
 578         struct rtos_reg **reg_list,
 579         int *num_regs)
 580 {
 581         int retval;
 582
 583         if (stack_ptr == 0) {
 584                 LOG_ERROR("Error: null stack pointer in thread");
 585                 return -5;
 586         }
 587         /* Read the stack */
 588         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 589         uint32_t address = stack_ptr;
 590
 591         if (stacking->stack_growth_direction == 1)
 592                 address -= stacking->stack_registers_size;
 593         retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 594         if (retval != ERROR_OK) {
 595                 free(stack_data);
 596                 LOG_ERROR("Error reading stack frame from thread");
 597                 return retval;
 598         }
 599         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 600
 601 #if 0
 602                 LOG_OUTPUT("Stack Data :");
 603                 for (i = 0; i < stacking->stack_registers_size; i++)
 604                         LOG_OUTPUT("%02X", stack_data[i]);
 605                 LOG_OUTPUT("\r\n");
 606 #endif
 607
 608         int64_t new_stack_ptr;
 609         if (stacking->calculate_process_stack != NULL) {
 610                 new_stack_ptr = stacking->calculate_process_stack(target,
 611                                 stack_data, stacking, stack_ptr);
 612         } else {
 613                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 614                         stacking->stack_registers_size;
 615         }
 616
 617         *reg_list = calloc(stacking->num_output_registers, sizeof(struct rtos_reg));
 618         *num_regs = stacking->num_output_registers;
 619
 620         for (int i = 0; i < stacking->num_output_registers; ++i) {
 621                 (*reg_list)[i].number = stacking->register_offsets[i].number;
 622                 (*reg_list)[i].size = stacking->register_offsets[i].width_bits;
 623
 624                 int offset = stacking->register_offsets[i].offset;
 625                 if (offset == -2)
 626                         buf_cpy(&new_stack_ptr, (*reg_list)[i].value, (*reg_list)[i].size);
 627                 else if (offset != -1)
 628                         buf_cpy(stack_data + offset, (*reg_list)[i].value, (*reg_list)[i].size);
 629         }
 630
 631         free(stack_data);
 632 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 633         return ERROR_OK;
 634 }
 635
 636 static int rtos_try_next(struct target *target)
 637 {
 638         struct rtos *os = target->rtos;
 639         struct rtos_type **type = rtos_types;
 640
 641         if (!os)
 642                 return 0;
 643
 644         while (*type && os->type != *type)
 645                 type++;
 646
 647         if (!*type || !*(++type))
 648                 return 0;
 649
 650         os->type = *type;
 651
 652         free(os->symbols);
 653         os->symbols = NULL;
 654
 655         return 1;
 656 }
 657
 658 int rtos_update_threads(struct target *target)
 659 {
 660         if ((target->rtos != NULL) && (target->rtos->type != NULL))
 661                 target->rtos->type->update_threads(target->rtos);
 662         return ERROR_OK;
 663 }
 664
 665 void rtos_free_threadlist(struct rtos *rtos)
 666 {
 667         if (rtos->thread_details) {
 668                 int j;
 669
 670                 for (j = 0; j < rtos->thread_count; j++) {
 671                         struct thread_detail *current_thread = &rtos->thread_details[j];
 672                         free(current_thread->thread_name_str);
 673                         free(current_thread->extra_info_str);
 674                 }
 675                 free(rtos->thread_details);
 676                 rtos->thread_details = NULL;
 677                 rtos->thread_count = 0;
 678                 rtos->current_threadid = -1;
 679                 rtos->current_thread = 0;
 680         }
 681 }