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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_rtos;
  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_rtos,
  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 (ret == JIM_OK) {
 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(struct jim_getopt_info *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 (strcmp(cp, "auto") == 0) {
 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 (strcmp(cp, rtos_types[x]->name) == 0)
 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)
 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
 270         LOG_DEBUG("RTOS: Address of symbol '%s' is 0x%" PRIx64, cur_sym, addr);
 271
 272         next_sym = next_symbol(os, cur_sym, addr);
 273
 274         /* Should never happen unless the debugger misbehaves */
 275         if (next_sym == NULL) {
 276                 LOG_WARNING("RTOS: Debugger sent us qSymbol with '%s' that we did not ask for", cur_sym);
 277                 goto done;
 278         }
 279
 280         if (!next_sym->symbol_name) {
 281                 /* No more symbols need looking up */
 282
 283                 if (!target->rtos_auto_detect) {
 284                         rtos_detected = 1;
 285                         goto done;
 286                 }
 287
 288                 if (os->type->detect_rtos(target)) {
 289                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 290                         rtos_detected = 1;
 291                         goto done;
 292                 } else {
 293                         LOG_WARNING("No RTOS could be auto-detected!");
 294                         goto done;
 295                 }
 296         }
 297
 298         if (8 + (strlen(next_sym->symbol_name) * 2) + 1 > sizeof(reply)) {
 299                 LOG_ERROR("ERROR: RTOS symbol '%s' name is too long for GDB!", next_sym->symbol_name);
 300                 goto done;
 301         }
 302
 303         LOG_DEBUG("RTOS: Requesting symbol lookup of '%s' from the debugger", next_sym->symbol_name);
 304
 305         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 306         reply_len += hexify(reply + reply_len,
 307                 (const uint8_t *)next_sym->symbol_name, strlen(next_sym->symbol_name),
 308                 sizeof(reply) - reply_len);
 309
 310 done:
 311         gdb_put_packet(connection, reply, reply_len);
 312         return rtos_detected;
 313 }
 314
 315 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 316 {
 317         struct target *target = get_target_from_connection(connection);
 318
 319         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 320                 if ((target->rtos) && (target->rtos->thread_details) &&
 321                                 (target->rtos->thread_count != 0)) {
 322                         threadid_t threadid = 0;
 323                         int found = -1;
 324                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 325
 326                         if ((target->rtos) && (target->rtos->thread_details)) {
 327                                 int thread_num;
 328                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 329                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 330                                                 if (target->rtos->thread_details[thread_num].exists)
 331                                                         found = thread_num;
 332                                         }
 333                                 }
 334                         }
 335                         if (found == -1) {
 336                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 337                                 return ERROR_OK;
 338                         }
 339
 340                         struct thread_detail *detail = &target->rtos->thread_details[found];
 341
 342                         int str_size = 0;
 343                         if (detail->thread_name_str)
 344                                 str_size += strlen(detail->thread_name_str);
 345                         if (detail->extra_info_str)
 346                                 str_size += strlen(detail->extra_info_str);
 347
 348                         char *tmp_str = calloc(str_size + 9, sizeof(char));
 349                         char *tmp_str_ptr = tmp_str;
 350
 351                         if (detail->thread_name_str)
 352                                 tmp_str_ptr += sprintf(tmp_str_ptr, "Name: %s", detail->thread_name_str);
 353                         if (detail->extra_info_str) {
 354                                 if (tmp_str_ptr != tmp_str)
 355                                         tmp_str_ptr += sprintf(tmp_str_ptr, ", ");
 356                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 357                         }
 358
 359                         assert(strlen(tmp_str) ==
 360                                 (size_t) (tmp_str_ptr - tmp_str));
 361
 362                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 363                         size_t pkt_len = hexify(hex_str, (const uint8_t *)tmp_str,
 364                                 strlen(tmp_str), strlen(tmp_str) * 2 + 1);
 365
 366                         gdb_put_packet(connection, hex_str, pkt_len);
 367                         free(hex_str);
 368                         free(tmp_str);
 369                         return ERROR_OK;
 370
 371                 }
 372                 gdb_put_packet(connection, "", 0);
 373                 return ERROR_OK;
 374         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 375                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 376                         if (target->rtos_auto_detect == true) {
 377                                 target->rtos_auto_detect = false;
 378                                 target->rtos->type->create(target);
 379                         }
 380                         target->rtos->type->update_threads(target->rtos);
 381                 }
 382                 return ERROR_OK;
 383         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 384                 int i;
 385                 if (target->rtos) {
 386                         if (target->rtos->thread_count == 0) {
 387                                 gdb_put_packet(connection, "l", 1);
 388                         } else {
 389                                 /*thread id are 16 char +1 for ',' */
 390                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 391                                 char *tmp_str = out_str;
 392                                 for (i = 0; i < target->rtos->thread_count; i++) {
 393                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 394                                                                                 target->rtos->thread_details[i].threadid);
 395                                 }
 396                                 gdb_put_packet(connection, out_str, strlen(out_str));
 397                                 free(out_str);
 398                         }
 399                 } else
 400                         gdb_put_packet(connection, "l", 1);
 401
 402                 return ERROR_OK;
 403         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 404                 gdb_put_packet(connection, "l", 1);
 405                 return ERROR_OK;
 406         } else if (strncmp(packet, "qAttached", 9) == 0) {
 407                 gdb_put_packet(connection, "1", 1);
 408                 return ERROR_OK;
 409         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 410                 char offsets[] = "Text=0;Data=0;Bss=0";
 411                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 412                 return ERROR_OK;
 413         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 414                 /* make sure we check this before "qC" packet below
 415                  * otherwise it gets incorrectly handled */
 416                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 417         } else if (strncmp(packet, "qC", 2) == 0) {
 418                 if (target->rtos) {
 419                         char buffer[19];
 420                         int size;
 421                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 422                         gdb_put_packet(connection, buffer, size);
 423                 } else
 424                         gdb_put_packet(connection, "QC0", 3);
 425                 return ERROR_OK;
 426         } else if (packet[0] == 'T') {  /* Is thread alive? */
 427                 threadid_t threadid;
 428                 int found = -1;
 429                 sscanf(packet, "T%" SCNx64, &threadid);
 430                 if ((target->rtos) && (target->rtos->thread_details)) {
 431                         int thread_num;
 432                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 433                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 434                                         if (target->rtos->thread_details[thread_num].exists)
 435                                                 found = thread_num;
 436                                 }
 437                         }
 438                 }
 439                 if (found != -1)
 440                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 441                 else
 442                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 443                 return ERROR_OK;
 444         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 445                                          * all other operations ) */
 446                 if ((packet[1] == 'g') && (target->rtos)) {
 447                         threadid_t threadid;
 448                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 449                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 450                         /* threadid of 0 indicates target should choose */
 451                         if (threadid == 0)
 452                                 target->rtos->current_threadid = target->rtos->current_thread;
 453                         else
 454                                 target->rtos->current_threadid = threadid;
 455                 }
 456                 gdb_put_packet(connection, "OK", 2);
 457                 return ERROR_OK;
 458         }
 459
 460         return GDB_THREAD_PACKET_NOT_CONSUMED;
 461 }
 462
 463 static int rtos_put_gdb_reg_list(struct connection *connection,
 464                 struct rtos_reg *reg_list, int num_regs)
 465 {
 466         size_t num_bytes = 1; /* NUL */
 467         for (int i = 0; i < num_regs; ++i)
 468                 num_bytes += DIV_ROUND_UP(reg_list[i].size, 8) * 2;
 469
 470         char *hex = malloc(num_bytes);
 471         char *hex_p = hex;
 472
 473         for (int i = 0; i < num_regs; ++i) {
 474                 size_t count = DIV_ROUND_UP(reg_list[i].size, 8);
 475                 size_t n = hexify(hex_p, reg_list[i].value, count, num_bytes);
 476                 hex_p += n;
 477                 num_bytes -= n;
 478         }
 479
 480         gdb_put_packet(connection, hex, strlen(hex));
 481         free(hex);
 482
 483         return ERROR_OK;
 484 }
 485
 486 /** Look through all registers to find this register. */
 487 int rtos_get_gdb_reg(struct connection *connection, int reg_num)
 488 {
 489         struct target *target = get_target_from_connection(connection);
 490         int64_t current_threadid = target->rtos->current_threadid;
 491         if ((target->rtos) && (current_threadid != -1) &&
 492                         (current_threadid != 0) &&
 493                         ((current_threadid != target->rtos->current_thread) ||
 494                         (target->smp))) {       /* in smp several current thread are possible */
 495                 struct rtos_reg *reg_list;
 496                 int num_regs;
 497
 498                 LOG_DEBUG("getting register %d for thread 0x%" PRIx64
 499                                   ", target->rtos->current_thread=0x%" PRIx64,
 500                                                                                 reg_num,
 501                                                                                 current_threadid,
 502                                                                                 target->rtos->current_thread);
 503
 504                 int retval;
 505                 if (target->rtos->type->get_thread_reg) {
 506                         reg_list = calloc(1, sizeof(*reg_list));
 507                         num_regs = 1;
 508                         retval = target->rtos->type->get_thread_reg(target->rtos,
 509                                         current_threadid, reg_num, &reg_list[0]);
 510                         if (retval != ERROR_OK) {
 511                                 LOG_ERROR("RTOS: failed to get register %d", reg_num);
 512                                 return retval;
 513                         }
 514                 } else {
 515                         retval = target->rtos->type->get_thread_reg_list(target->rtos,
 516                                         current_threadid,
 517                                         &reg_list,
 518                                         &num_regs);
 519                         if (retval != ERROR_OK) {
 520                                 LOG_ERROR("RTOS: failed to get register list");
 521                                 return retval;
 522                         }
 523                 }
 524
 525                 for (int i = 0; i < num_regs; ++i) {
 526                         if (reg_list[i].number == (uint32_t)reg_num) {
 527                                 rtos_put_gdb_reg_list(connection, reg_list + i, 1);
 528                                 free(reg_list);
 529                                 return ERROR_OK;
 530                         }
 531                 }
 532
 533                 free(reg_list);
 534         }
 535         return ERROR_FAIL;
 536 }
 537
 538 /** Return a list of general registers. */
 539 int rtos_get_gdb_reg_list(struct connection *connection)
 540 {
 541         struct target *target = get_target_from_connection(connection);
 542         int64_t current_threadid = target->rtos->current_threadid;
 543         if ((target->rtos) && (current_threadid != -1) &&
 544                         (current_threadid != 0) &&
 545                         ((current_threadid != target->rtos->current_thread) ||
 546                         (target->smp))) {       /* in smp several current thread are possible */
 547                 struct rtos_reg *reg_list;
 548                 int num_regs;
 549
 550                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 551                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 552                                                                                 current_threadid,
 553                                                                                 target->rtos->current_thread);
 554
 555                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 556                                 current_threadid,
 557                                 &reg_list,
 558                                 &num_regs);
 559                 if (retval != ERROR_OK) {
 560                         LOG_ERROR("RTOS: failed to get register list");
 561                         return retval;
 562                 }
 563
 564                 rtos_put_gdb_reg_list(connection, reg_list, num_regs);
 565                 free(reg_list);
 566
 567                 return ERROR_OK;
 568         }
 569         return ERROR_FAIL;
 570 }
 571
 572 int rtos_set_reg(struct connection *connection, int reg_num,
 573                 uint8_t *reg_value)
 574 {
 575         struct target *target = get_target_from_connection(connection);
 576         int64_t current_threadid = target->rtos->current_threadid;
 577         if ((target->rtos) &&
 578                         (target->rtos->type->set_reg) &&
 579                         (current_threadid != -1) &&
 580                         (current_threadid != 0)) {
 581                 return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
 582         }
 583         return ERROR_FAIL;
 584 }
 585
 586 int rtos_generic_stack_read(struct target *target,
 587         const struct rtos_register_stacking *stacking,
 588         int64_t stack_ptr,
 589         struct rtos_reg **reg_list,
 590         int *num_regs)
 591 {
 592         int retval;
 593
 594         if (stack_ptr == 0) {
 595                 LOG_ERROR("Error: null stack pointer in thread");
 596                 return -5;
 597         }
 598         /* Read the stack */
 599         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 600         uint32_t address = stack_ptr;
 601
 602         if (stacking->stack_growth_direction == 1)
 603                 address -= stacking->stack_registers_size;
 604         retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 605         if (retval != ERROR_OK) {
 606                 free(stack_data);
 607                 LOG_ERROR("Error reading stack frame from thread");
 608                 return retval;
 609         }
 610         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 611
 612 #if 0
 613                 LOG_OUTPUT("Stack Data :");
 614                 for (i = 0; i < stacking->stack_registers_size; i++)
 615                         LOG_OUTPUT("%02X", stack_data[i]);
 616                 LOG_OUTPUT("\r\n");
 617 #endif
 618
 619         int64_t new_stack_ptr;
 620         if (stacking->calculate_process_stack) {
 621                 new_stack_ptr = stacking->calculate_process_stack(target,
 622                                 stack_data, stacking, stack_ptr);
 623         } else {
 624                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 625                         stacking->stack_registers_size;
 626         }
 627
 628         *reg_list = calloc(stacking->num_output_registers, sizeof(struct rtos_reg));
 629         *num_regs = stacking->num_output_registers;
 630
 631         for (int i = 0; i < stacking->num_output_registers; ++i) {
 632                 (*reg_list)[i].number = stacking->register_offsets[i].number;
 633                 (*reg_list)[i].size = stacking->register_offsets[i].width_bits;
 634
 635                 int offset = stacking->register_offsets[i].offset;
 636                 if (offset == -2)
 637                         buf_cpy(&new_stack_ptr, (*reg_list)[i].value, (*reg_list)[i].size);
 638                 else if (offset != -1)
 639                         buf_cpy(stack_data + offset, (*reg_list)[i].value, (*reg_list)[i].size);
 640         }
 641
 642         free(stack_data);
 643 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 644         return ERROR_OK;
 645 }
 646
 647 static int rtos_try_next(struct target *target)
 648 {
 649         struct rtos *os = target->rtos;
 650         struct rtos_type **type = rtos_types;
 651
 652         if (!os)
 653                 return 0;
 654
 655         while (*type && os->type != *type)
 656                 type++;
 657
 658         if (!*type || !*(++type))
 659                 return 0;
 660
 661         os->type = *type;
 662
 663         free(os->symbols);
 664         os->symbols = NULL;
 665
 666         return 1;
 667 }
 668
 669 int rtos_update_threads(struct target *target)
 670 {
 671         if ((target->rtos) && (target->rtos->type))
 672                 target->rtos->type->update_threads(target->rtos);
 673         return ERROR_OK;
 674 }
 675
 676 void rtos_free_threadlist(struct rtos *rtos)
 677 {
 678         if (rtos->thread_details) {
 679                 int j;
 680
 681                 for (j = 0; j < rtos->thread_count; j++) {
 682                         struct thread_detail *current_thread = &rtos->thread_details[j];
 683                         free(current_thread->thread_name_str);
 684                         free(current_thread->extra_info_str);
 685                 }
 686                 free(rtos->thread_details);
 687                 rtos->thread_details = NULL;
 688                 rtos->thread_count = 0;
 689                 rtos->current_threadid = -1;
 690                 rtos->current_thread = 0;
 691         }
 692 }
 693
 694 int rtos_read_buffer(struct target *target, target_addr_t address,
 695                 uint32_t size, uint8_t *buffer)
 696 {
 697         if (target->rtos->type->read_buffer)
 698                 return target->rtos->type->read_buffer(target->rtos, address, size, buffer);
 699         return ERROR_NOT_IMPLEMENTED;
 700 }
 701
 702 int rtos_write_buffer(struct target *target, target_addr_t address,
 703                 uint32_t size, const uint8_t *buffer)
 704 {
 705         if (target->rtos->type->write_buffer)
 706                 return target->rtos->type->write_buffer(target->rtos, address, size, buffer);
 707         return ERROR_NOT_IMPLEMENTED;
 708 }