src/rtos/rtos.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2011 by Broadcom Corporation                            *
   5  *   Evan Hunter - ehunter@broadcom.com                                    *
   6  ***************************************************************************/
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include "config.h"
  10 #endif
  11
  12 #include "rtos.h"
  13 #include "target/target.h"
  14 #include "helper/log.h"
  15 #include "helper/binarybuffer.h"
  16 #include "server/gdb_server.h"
  17
  18 static const struct rtos_type *rtos_types[] = {
  19         &threadx_rtos,
  20         &freertos_rtos,
  21         &ecos_rtos,
  22         &linux_rtos,
  23         &chibios_rtos,
  24         &chromium_ec_rtos,
  25         &embkernel_rtos,
  26         &mqx_rtos,
  27         &ucos_iii_rtos,
  28         &nuttx_rtos,
  29         &riot_rtos,
  30         &zephyr_rtos,
  31         &rtkernel_rtos,
  32         /* keep this as last, as it always matches with rtos auto */
  33         &hwthread_rtos,
  34         NULL
  35 };
  36
  37 static int rtos_try_next(struct target *target);
  38
  39 int rtos_smp_init(struct target *target)
  40 {
  41         if (target->rtos->type->smp_init)
  42                 return target->rtos->type->smp_init(target);
  43         return ERROR_TARGET_INIT_FAILED;
  44 }
  45
  46 static int rtos_target_for_threadid(struct connection *connection, int64_t threadid, struct target **t)
  47 {
  48         struct target *curr = get_target_from_connection(connection);
  49         if (t)
  50                 *t = curr;
  51
  52         return ERROR_OK;
  53 }
  54
  55 static int os_alloc(struct target *target, const struct rtos_type *ostype)
  56 {
  57         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  58
  59         if (!os)
  60                 return JIM_ERR;
  61
  62         os->type = ostype;
  63         os->current_threadid = -1;
  64         os->current_thread = 0;
  65         os->symbols = NULL;
  66         os->target = target;
  67
  68         /* RTOS drivers can override the packet handler in _create(). */
  69         os->gdb_thread_packet = rtos_thread_packet;
  70         os->gdb_target_for_threadid = rtos_target_for_threadid;
  71
  72         return JIM_OK;
  73 }
  74
  75 static void os_free(struct target *target)
  76 {
  77         if (!target->rtos)
  78                 return;
  79
  80         free(target->rtos->symbols);
  81         rtos_free_threadlist(target->rtos);
  82         free(target->rtos);
  83         target->rtos = NULL;
  84 }
  85
  86 static int os_alloc_create(struct target *target, const struct rtos_type *ostype)
  87 {
  88         int ret = os_alloc(target, ostype);
  89
  90         if (ret == JIM_OK) {
  91                 ret = target->rtos->type->create(target);
  92                 if (ret != JIM_OK)
  93                         os_free(target);
  94         }
  95
  96         return ret;
  97 }
  98
  99 int rtos_create(struct jim_getopt_info *goi, struct target *target)
 100 {
 101         int x;
 102         const char *cp;
 103         Jim_Obj *res;
 104         int e;
 105
 106         if (!goi->isconfigure && goi->argc != 0) {
 107                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 108                 return JIM_ERR;
 109         }
 110
 111         os_free(target);
 112
 113         e = jim_getopt_string(goi, &cp, NULL);
 114         if (e != JIM_OK)
 115                 return e;
 116
 117         if (strcmp(cp, "none") == 0)
 118                 return JIM_OK;
 119
 120         if (strcmp(cp, "auto") == 0) {
 121                 /* Auto detect tries to look up all symbols for each RTOS,
 122                  * and runs the RTOS driver's _detect() function when GDB
 123                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 124                 target->rtos_auto_detect = true;
 125
 126                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 127                  * target->rtos here, and set it to the first RTOS type. */
 128                 return os_alloc(target, rtos_types[0]);
 129         }
 130
 131         for (x = 0; rtos_types[x]; x++)
 132                 if (strcmp(cp, rtos_types[x]->name) == 0)
 133                         return os_alloc_create(target, rtos_types[x]);
 134
 135         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 136         res = Jim_GetResult(goi->interp);
 137         for (x = 0; rtos_types[x]; x++)
 138                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 139         Jim_AppendStrings(goi->interp, res, ", auto or none", NULL);
 140
 141         return JIM_ERR;
 142 }
 143
 144 void rtos_destroy(struct target *target)
 145 {
 146         os_free(target);
 147 }
 148
 149 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 150 {
 151         struct target *target = get_target_from_connection(connection);
 152         if (!target->rtos)
 153                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 154                                                                                  *found*/
 155         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 156 }
 157
 158 static struct symbol_table_elem *find_symbol(const struct rtos *os, const char *symbol)
 159 {
 160         struct symbol_table_elem *s;
 161
 162         for (s = os->symbols; s->symbol_name; s++)
 163                 if (!strcmp(s->symbol_name, symbol))
 164                         return s;
 165
 166         return NULL;
 167 }
 168
 169 static struct symbol_table_elem *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 170 {
 171         if (!os->symbols)
 172                 os->type->get_symbol_list_to_lookup(&os->symbols);
 173
 174         if (!cur_symbol[0])
 175                 return &os->symbols[0];
 176
 177         struct symbol_table_elem *s = find_symbol(os, cur_symbol);
 178         if (!s)
 179                 return NULL;
 180
 181         s->address = cur_addr;
 182         s++;
 183         return s;
 184 }
 185
 186 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 187  *
 188  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 189  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 190  *
 191  * If the qSymbol packet has no address that means GDB did not find the
 192  * symbol, in which case auto-detect will move on to try the next RTOS.
 193  *
 194  * rtos_qsymbol() then calls the next_symbol() helper function, which
 195  * iterates over symbol names for the current RTOS until it finds the
 196  * symbol in the received GDB packet, and then returns the next entry
 197  * in the list of symbols.
 198  *
 199  * If GDB replied about the last symbol for the RTOS and the RTOS was
 200  * specified explicitly, then no further symbol lookup is done. When
 201  * auto-detecting, the RTOS driver _detect() function must return success.
 202  *
 203  * The symbol is tried twice to handle the -flto case with gcc.  The first
 204  * attempt uses the symbol as-is, and the second attempt tries the symbol
 205  * with ".lto_priv.0" appended to it.  We only consider the first static
 206  * symbol here from the -flto case.  (Each subsequent static symbol with
 207  * the same name is exported as .lto_priv.1, .lto_priv.2, etc.)
 208  *
 209  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 210  */
 211 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 212 {
 213         int rtos_detected = 0;
 214         uint64_t addr = 0;
 215         size_t reply_len;
 216         char reply[GDB_BUFFER_SIZE + 1], cur_sym[GDB_BUFFER_SIZE / 2 + 1] = ""; /* Extra byte for null-termination */
 217         struct symbol_table_elem *next_sym = NULL;
 218         struct target *target = get_target_from_connection(connection);
 219         struct rtos *os = target->rtos;
 220
 221         reply_len = sprintf(reply, "OK");
 222
 223         if (!os)
 224                 goto done;
 225
 226         /* Decode any symbol name in the packet*/
 227         size_t len = unhexify((uint8_t *)cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 228         cur_sym[len] = 0;
 229
 230         const char no_suffix[] = "";
 231         const char lto_suffix[] = ".lto_priv.0";
 232         const size_t lto_suffix_len = strlen(lto_suffix);
 233
 234         const char *cur_suffix;
 235         const char *next_suffix;
 236
 237         /* Detect what suffix was used during the previous symbol lookup attempt, and
 238          * speculatively determine the next suffix (only used for the unknown address case) */
 239         if (len > lto_suffix_len && !strcmp(cur_sym + len - lto_suffix_len, lto_suffix)) {
 240                 /* Trim the suffix from cur_sym for comparison purposes below */
 241                 cur_sym[len - lto_suffix_len] = '\0';
 242                 cur_suffix = lto_suffix;
 243                 next_suffix = NULL;
 244         } else {
 245                 cur_suffix = no_suffix;
 246                 next_suffix = lto_suffix;
 247         }
 248
 249         if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
 250             (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr))) { /* GDB did not find an address for a symbol */
 251
 252                 /* GDB could not find an address for the previous symbol */
 253                 struct symbol_table_elem *sym = find_symbol(os, cur_sym);
 254
 255                 if (next_suffix) {
 256                         next_sym = sym;
 257                 } else if (sym && !sym->optional) {     /* the symbol is mandatory for this RTOS */
 258                         if (!target->rtos_auto_detect) {
 259                                 LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 260                                 goto done;
 261                         } else {
 262                                 /* Autodetecting RTOS - try next RTOS */
 263                                 if (!rtos_try_next(target)) {
 264                                         LOG_WARNING("No RTOS could be auto-detected!");
 265                                         goto done;
 266                                 }
 267
 268                                 /* Next RTOS selected - invalidate current symbol */
 269                                 cur_sym[0] = '\x00';
 270                         }
 271                 }
 272         }
 273
 274         LOG_DEBUG("RTOS: Address of symbol '%s%s' is 0x%" PRIx64, cur_sym, cur_suffix, addr);
 275
 276         if (!next_sym) {
 277                 next_sym = next_symbol(os, cur_sym, addr);
 278                 next_suffix = no_suffix;
 279         }
 280
 281         /* Should never happen unless the debugger misbehaves */
 282         if (!next_sym) {
 283                 LOG_WARNING("RTOS: Debugger sent us qSymbol with '%s%s' that we did not ask for", cur_sym, cur_suffix);
 284                 goto done;
 285         }
 286
 287         if (!next_sym->symbol_name) {
 288                 /* No more symbols need looking up */
 289
 290                 if (!target->rtos_auto_detect) {
 291                         rtos_detected = 1;
 292                         goto done;
 293                 }
 294
 295                 if (os->type->detect_rtos(target)) {
 296                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 297                         rtos_detected = 1;
 298                         goto done;
 299                 } else {
 300                         LOG_WARNING("No RTOS could be auto-detected!");
 301                         goto done;
 302                 }
 303         }
 304
 305         assert(next_suffix);
 306
 307         reply_len = 8;                                   /* snprintf(..., "qSymbol:") */
 308         reply_len += 2 * strlen(next_sym->symbol_name);  /* hexify(..., next_sym->symbol_name, ...) */
 309         reply_len += 2 * strlen(next_suffix);            /* hexify(..., next_suffix, ...) */
 310         reply_len += 1;                                  /* Terminating NUL */
 311         if (reply_len > sizeof(reply)) {
 312                 LOG_ERROR("ERROR: RTOS symbol '%s%s' name is too long for GDB!", next_sym->symbol_name, next_suffix);
 313                 goto done;
 314         }
 315
 316         LOG_DEBUG("RTOS: Requesting symbol lookup of '%s%s' from the debugger", next_sym->symbol_name, next_suffix);
 317
 318         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 319         reply_len += hexify(reply + reply_len,
 320                 (const uint8_t *)next_sym->symbol_name, strlen(next_sym->symbol_name),
 321                 sizeof(reply) - reply_len);
 322         reply_len += hexify(reply + reply_len,
 323                 (const uint8_t *)next_suffix, strlen(next_suffix),
 324                 sizeof(reply) - reply_len);
 325
 326 done:
 327         gdb_put_packet(connection, reply, reply_len);
 328         return rtos_detected;
 329 }
 330
 331 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 332 {
 333         struct target *target = get_target_from_connection(connection);
 334
 335         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 336                 if ((target->rtos) && (target->rtos->thread_details) &&
 337                                 (target->rtos->thread_count != 0)) {
 338                         threadid_t threadid = 0;
 339                         int found = -1;
 340                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 341
 342                         if ((target->rtos) && (target->rtos->thread_details)) {
 343                                 int thread_num;
 344                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 345                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 346                                                 if (target->rtos->thread_details[thread_num].exists)
 347                                                         found = thread_num;
 348                                         }
 349                                 }
 350                         }
 351                         if (found == -1) {
 352                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 353                                 return ERROR_OK;
 354                         }
 355
 356                         struct thread_detail *detail = &target->rtos->thread_details[found];
 357
 358                         int str_size = 0;
 359                         if (detail->thread_name_str)
 360                                 str_size += strlen(detail->thread_name_str);
 361                         if (detail->extra_info_str)
 362                                 str_size += strlen(detail->extra_info_str);
 363
 364                         char *tmp_str = calloc(str_size + 9, sizeof(char));
 365                         char *tmp_str_ptr = tmp_str;
 366
 367                         if (detail->thread_name_str)
 368                                 tmp_str_ptr += sprintf(tmp_str_ptr, "Name: %s", detail->thread_name_str);
 369                         if (detail->extra_info_str) {
 370                                 if (tmp_str_ptr != tmp_str)
 371                                         tmp_str_ptr += sprintf(tmp_str_ptr, ", ");
 372                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 373                         }
 374
 375                         assert(strlen(tmp_str) ==
 376                                 (size_t) (tmp_str_ptr - tmp_str));
 377
 378                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 379                         size_t pkt_len = hexify(hex_str, (const uint8_t *)tmp_str,
 380                                 strlen(tmp_str), strlen(tmp_str) * 2 + 1);
 381
 382                         gdb_put_packet(connection, hex_str, pkt_len);
 383                         free(hex_str);
 384                         free(tmp_str);
 385                         return ERROR_OK;
 386
 387                 }
 388                 gdb_put_packet(connection, "", 0);
 389                 return ERROR_OK;
 390         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 391                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 392                         if (target->rtos_auto_detect == true) {
 393                                 target->rtos_auto_detect = false;
 394                                 target->rtos->type->create(target);
 395                         }
 396                         target->rtos->type->update_threads(target->rtos);
 397                 }
 398                 return ERROR_OK;
 399         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 400                 int i;
 401                 if (target->rtos) {
 402                         if (target->rtos->thread_count == 0) {
 403                                 gdb_put_packet(connection, "l", 1);
 404                         } else {
 405                                 /*thread id are 16 char +1 for ',' */
 406                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 407                                 char *tmp_str = out_str;
 408                                 for (i = 0; i < target->rtos->thread_count; i++) {
 409                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 410                                                                                 target->rtos->thread_details[i].threadid);
 411                                 }
 412                                 gdb_put_packet(connection, out_str, strlen(out_str));
 413                                 free(out_str);
 414                         }
 415                 } else
 416                         gdb_put_packet(connection, "l", 1);
 417
 418                 return ERROR_OK;
 419         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 420                 gdb_put_packet(connection, "l", 1);
 421                 return ERROR_OK;
 422         } else if (strncmp(packet, "qAttached", 9) == 0) {
 423                 gdb_put_packet(connection, "1", 1);
 424                 return ERROR_OK;
 425         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 426                 char offsets[] = "Text=0;Data=0;Bss=0";
 427                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 428                 return ERROR_OK;
 429         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 430                 /* make sure we check this before "qC" packet below
 431                  * otherwise it gets incorrectly handled */
 432                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 433         } else if (strncmp(packet, "qC", 2) == 0) {
 434                 if (target->rtos) {
 435                         char buffer[19];
 436                         int size;
 437                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 438                         gdb_put_packet(connection, buffer, size);
 439                 } else
 440                         gdb_put_packet(connection, "QC0", 3);
 441                 return ERROR_OK;
 442         } else if (packet[0] == 'T') {  /* Is thread alive? */
 443                 threadid_t threadid;
 444                 int found = -1;
 445                 sscanf(packet, "T%" SCNx64, &threadid);
 446                 if ((target->rtos) && (target->rtos->thread_details)) {
 447                         int thread_num;
 448                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 449                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 450                                         if (target->rtos->thread_details[thread_num].exists)
 451                                                 found = thread_num;
 452                                 }
 453                         }
 454                 }
 455                 if (found != -1)
 456                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 457                 else
 458                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 459                 return ERROR_OK;
 460         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 461                                          * all other operations ) */
 462                 if ((packet[1] == 'g') && (target->rtos)) {
 463                         threadid_t threadid;
 464                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 465                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 466                         /* threadid of 0 indicates target should choose */
 467                         if (threadid == 0)
 468                                 target->rtos->current_threadid = target->rtos->current_thread;
 469                         else
 470                                 target->rtos->current_threadid = threadid;
 471                 }
 472                 gdb_put_packet(connection, "OK", 2);
 473                 return ERROR_OK;
 474         }
 475
 476         return GDB_THREAD_PACKET_NOT_CONSUMED;
 477 }
 478
 479 static int rtos_put_gdb_reg_list(struct connection *connection,
 480                 struct rtos_reg *reg_list, int num_regs)
 481 {
 482         size_t num_bytes = 1; /* NUL */
 483         for (int i = 0; i < num_regs; ++i)
 484                 num_bytes += DIV_ROUND_UP(reg_list[i].size, 8) * 2;
 485
 486         char *hex = malloc(num_bytes);
 487         char *hex_p = hex;
 488
 489         for (int i = 0; i < num_regs; ++i) {
 490                 size_t count = DIV_ROUND_UP(reg_list[i].size, 8);
 491                 size_t n = hexify(hex_p, reg_list[i].value, count, num_bytes);
 492                 hex_p += n;
 493                 num_bytes -= n;
 494         }
 495
 496         gdb_put_packet(connection, hex, strlen(hex));
 497         free(hex);
 498
 499         return ERROR_OK;
 500 }
 501
 502 /** Look through all registers to find this register. */
 503 int rtos_get_gdb_reg(struct connection *connection, int reg_num)
 504 {
 505         struct target *target = get_target_from_connection(connection);
 506         int64_t current_threadid = target->rtos->current_threadid;
 507         if ((target->rtos) && (current_threadid != -1) &&
 508                         (current_threadid != 0) &&
 509                         ((current_threadid != target->rtos->current_thread) ||
 510                         (target->smp))) {       /* in smp several current thread are possible */
 511                 struct rtos_reg *reg_list;
 512                 int num_regs;
 513
 514                 LOG_DEBUG("getting register %d for thread 0x%" PRIx64
 515                                   ", target->rtos->current_thread=0x%" PRIx64,
 516                                                                                 reg_num,
 517                                                                                 current_threadid,
 518                                                                                 target->rtos->current_thread);
 519
 520                 int retval;
 521                 if (target->rtos->type->get_thread_reg) {
 522                         reg_list = calloc(1, sizeof(*reg_list));
 523                         num_regs = 1;
 524                         retval = target->rtos->type->get_thread_reg(target->rtos,
 525                                         current_threadid, reg_num, &reg_list[0]);
 526                         if (retval != ERROR_OK) {
 527                                 LOG_ERROR("RTOS: failed to get register %d", reg_num);
 528                                 return retval;
 529                         }
 530                 } else {
 531                         retval = target->rtos->type->get_thread_reg_list(target->rtos,
 532                                         current_threadid,
 533                                         &reg_list,
 534                                         &num_regs);
 535                         if (retval != ERROR_OK) {
 536                                 LOG_ERROR("RTOS: failed to get register list");
 537                                 return retval;
 538                         }
 539                 }
 540
 541                 for (int i = 0; i < num_regs; ++i) {
 542                         if (reg_list[i].number == (uint32_t)reg_num) {
 543                                 rtos_put_gdb_reg_list(connection, reg_list + i, 1);
 544                                 free(reg_list);
 545                                 return ERROR_OK;
 546                         }
 547                 }
 548
 549                 free(reg_list);
 550         }
 551         return ERROR_FAIL;
 552 }
 553
 554 /** Return a list of general registers. */
 555 int rtos_get_gdb_reg_list(struct connection *connection)
 556 {
 557         struct target *target = get_target_from_connection(connection);
 558         int64_t current_threadid = target->rtos->current_threadid;
 559         if ((target->rtos) && (current_threadid != -1) &&
 560                         (current_threadid != 0) &&
 561                         ((current_threadid != target->rtos->current_thread) ||
 562                         (target->smp))) {       /* in smp several current thread are possible */
 563                 struct rtos_reg *reg_list;
 564                 int num_regs;
 565
 566                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 567                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 568                                                                                 current_threadid,
 569                                                                                 target->rtos->current_thread);
 570
 571                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 572                                 current_threadid,
 573                                 &reg_list,
 574                                 &num_regs);
 575                 if (retval != ERROR_OK) {
 576                         LOG_ERROR("RTOS: failed to get register list");
 577                         return retval;
 578                 }
 579
 580                 rtos_put_gdb_reg_list(connection, reg_list, num_regs);
 581                 free(reg_list);
 582
 583                 return ERROR_OK;
 584         }
 585         return ERROR_FAIL;
 586 }
 587
 588 int rtos_set_reg(struct connection *connection, int reg_num,
 589                 uint8_t *reg_value)
 590 {
 591         struct target *target = get_target_from_connection(connection);
 592         int64_t current_threadid = target->rtos->current_threadid;
 593         if ((target->rtos) &&
 594                         (target->rtos->type->set_reg) &&
 595                         (current_threadid != -1) &&
 596                         (current_threadid != 0)) {
 597                 return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
 598         }
 599         return ERROR_FAIL;
 600 }
 601
 602 int rtos_generic_stack_read(struct target *target,
 603         const struct rtos_register_stacking *stacking,
 604         int64_t stack_ptr,
 605         struct rtos_reg **reg_list,
 606         int *num_regs)
 607 {
 608         int retval;
 609
 610         if (stack_ptr == 0) {
 611                 LOG_ERROR("Error: null stack pointer in thread");
 612                 return -5;
 613         }
 614         /* Read the stack */
 615         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 616         uint32_t address = stack_ptr;
 617
 618         if (stacking->stack_growth_direction == 1)
 619                 address -= stacking->stack_registers_size;
 620         if (stacking->read_stack)
 621                 retval = stacking->read_stack(target, address, stacking, stack_data);
 622         else
 623                 retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 624         if (retval != ERROR_OK) {
 625                 free(stack_data);
 626                 LOG_ERROR("Error reading stack frame from thread");
 627                 return retval;
 628         }
 629         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 630
 631 #if 0
 632                 LOG_OUTPUT("Stack Data :");
 633                 for (i = 0; i < stacking->stack_registers_size; i++)
 634                         LOG_OUTPUT("%02X", stack_data[i]);
 635                 LOG_OUTPUT("\r\n");
 636 #endif
 637
 638         target_addr_t new_stack_ptr;
 639         if (stacking->calculate_process_stack) {
 640                 new_stack_ptr = stacking->calculate_process_stack(target,
 641                                 stack_data, stacking, stack_ptr);
 642         } else {
 643                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 644                         stacking->stack_registers_size;
 645         }
 646
 647         *reg_list = calloc(stacking->num_output_registers, sizeof(struct rtos_reg));
 648         *num_regs = stacking->num_output_registers;
 649
 650         for (int i = 0; i < stacking->num_output_registers; ++i) {
 651                 (*reg_list)[i].number = stacking->register_offsets[i].number;
 652                 (*reg_list)[i].size = stacking->register_offsets[i].width_bits;
 653
 654                 int offset = stacking->register_offsets[i].offset;
 655                 if (offset == -2)
 656                         buf_cpy(&new_stack_ptr, (*reg_list)[i].value, (*reg_list)[i].size);
 657                 else if (offset != -1)
 658                         buf_cpy(stack_data + offset, (*reg_list)[i].value, (*reg_list)[i].size);
 659         }
 660
 661         free(stack_data);
 662 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 663         return ERROR_OK;
 664 }
 665
 666 static int rtos_try_next(struct target *target)
 667 {
 668         struct rtos *os = target->rtos;
 669         const struct rtos_type **type = rtos_types;
 670
 671         if (!os)
 672                 return 0;
 673
 674         while (*type && os->type != *type)
 675                 type++;
 676
 677         if (!*type || !*(++type))
 678                 return 0;
 679
 680         os->type = *type;
 681
 682         free(os->symbols);
 683         os->symbols = NULL;
 684
 685         return 1;
 686 }
 687
 688 int rtos_update_threads(struct target *target)
 689 {
 690         if ((target->rtos) && (target->rtos->type))
 691                 target->rtos->type->update_threads(target->rtos);
 692         return ERROR_OK;
 693 }
 694
 695 void rtos_free_threadlist(struct rtos *rtos)
 696 {
 697         if (rtos->thread_details) {
 698                 int j;
 699
 700                 for (j = 0; j < rtos->thread_count; j++) {
 701                         struct thread_detail *current_thread = &rtos->thread_details[j];
 702                         free(current_thread->thread_name_str);
 703                         free(current_thread->extra_info_str);
 704                 }
 705                 free(rtos->thread_details);
 706                 rtos->thread_details = NULL;
 707                 rtos->thread_count = 0;
 708                 rtos->current_threadid = -1;
 709                 rtos->current_thread = 0;
 710         }
 711 }
 712
 713 int rtos_read_buffer(struct target *target, target_addr_t address,
 714                 uint32_t size, uint8_t *buffer)
 715 {
 716         if (target->rtos->type->read_buffer)
 717                 return target->rtos->type->read_buffer(target->rtos, address, size, buffer);
 718         return ERROR_NOT_IMPLEMENTED;
 719 }
 720
 721 int rtos_write_buffer(struct target *target, target_addr_t address,
 722                 uint32_t size, const uint8_t *buffer)
 723 {
 724         if (target->rtos->type->write_buffer)
 725                 return target->rtos->type->write_buffer(target->rtos, address, size, buffer);
 726         return ERROR_NOT_IMPLEMENTED;
 727 }