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_thread_packet(struct connection *connection, const char *packet, int packet_size);
  40
  41 int rtos_smp_init(struct target *target)
  42 {
  43         if (target->rtos->type->smp_init)
  44                 return target->rtos->type->smp_init(target);
  45         return ERROR_TARGET_INIT_FAILED;
  46 }
  47
  48 static int rtos_target_for_threadid(struct connection *connection, int64_t threadid, struct target **t)
  49 {
  50         struct target *curr = get_target_from_connection(connection);
  51         if (t)
  52                 *t = curr;
  53
  54         return ERROR_OK;
  55 }
  56
  57 static int os_alloc(struct target *target, const struct rtos_type *ostype)
  58 {
  59         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  60
  61         if (!os)
  62                 return JIM_ERR;
  63
  64         os->type = ostype;
  65         os->current_threadid = -1;
  66         os->current_thread = 0;
  67         os->symbols = NULL;
  68         os->target = target;
  69
  70         /* RTOS drivers can override the packet handler in _create(). */
  71         os->gdb_thread_packet = rtos_thread_packet;
  72         os->gdb_target_for_threadid = rtos_target_for_threadid;
  73
  74         return JIM_OK;
  75 }
  76
  77 static void os_free(struct target *target)
  78 {
  79         if (!target->rtos)
  80                 return;
  81
  82         free(target->rtos->symbols);
  83         free(target->rtos);
  84         target->rtos = NULL;
  85 }
  86
  87 static int os_alloc_create(struct target *target, const struct rtos_type *ostype)
  88 {
  89         int ret = os_alloc(target, ostype);
  90
  91         if (ret == JIM_OK) {
  92                 ret = target->rtos->type->create(target);
  93                 if (ret != JIM_OK)
  94                         os_free(target);
  95         }
  96
  97         return ret;
  98 }
  99
 100 int rtos_create(struct jim_getopt_info *goi, struct target *target)
 101 {
 102         int x;
 103         const char *cp;
 104         Jim_Obj *res;
 105         int e;
 106
 107         if (!goi->isconfigure && goi->argc != 0) {
 108                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 109                 return JIM_ERR;
 110         }
 111
 112         os_free(target);
 113
 114         e = jim_getopt_string(goi, &cp, NULL);
 115         if (e != JIM_OK)
 116                 return e;
 117
 118         if (strcmp(cp, "none") == 0)
 119                 return JIM_OK;
 120
 121         if (strcmp(cp, "auto") == 0) {
 122                 /* Auto detect tries to look up all symbols for each RTOS,
 123                  * and runs the RTOS driver's _detect() function when GDB
 124                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 125                 target->rtos_auto_detect = true;
 126
 127                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 128                  * target->rtos here, and set it to the first RTOS type. */
 129                 return os_alloc(target, rtos_types[0]);
 130         }
 131
 132         for (x = 0; rtos_types[x]; x++)
 133                 if (strcmp(cp, rtos_types[x]->name) == 0)
 134                         return os_alloc_create(target, rtos_types[x]);
 135
 136         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 137         res = Jim_GetResult(goi->interp);
 138         for (x = 0; rtos_types[x]; x++)
 139                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 140         Jim_AppendStrings(goi->interp, res, ", auto or none", NULL);
 141
 142         return JIM_ERR;
 143 }
 144
 145 void rtos_destroy(struct target *target)
 146 {
 147         os_free(target);
 148 }
 149
 150 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 151 {
 152         struct target *target = get_target_from_connection(connection);
 153         if (!target->rtos)
 154                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 155                                                                                  *found*/
 156         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 157 }
 158
 159 static struct symbol_table_elem *find_symbol(const struct rtos *os, const char *symbol)
 160 {
 161         struct symbol_table_elem *s;
 162
 163         for (s = os->symbols; s->symbol_name; s++)
 164                 if (!strcmp(s->symbol_name, symbol))
 165                         return s;
 166
 167         return NULL;
 168 }
 169
 170 static struct symbol_table_elem *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 171 {
 172         if (!os->symbols)
 173                 os->type->get_symbol_list_to_lookup(&os->symbols);
 174
 175         if (!cur_symbol[0])
 176                 return &os->symbols[0];
 177
 178         struct symbol_table_elem *s = find_symbol(os, cur_symbol);
 179         if (!s)
 180                 return NULL;
 181
 182         s->address = cur_addr;
 183         s++;
 184         return s;
 185 }
 186
 187 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 188  *
 189  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 190  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 191  *
 192  * If the qSymbol packet has no address that means GDB did not find the
 193  * symbol, in which case auto-detect will move on to try the next RTOS.
 194  *
 195  * rtos_qsymbol() then calls the next_symbol() helper function, which
 196  * iterates over symbol names for the current RTOS until it finds the
 197  * symbol in the received GDB packet, and then returns the next entry
 198  * in the list of symbols.
 199  *
 200  * If GDB replied about the last symbol for the RTOS and the RTOS was
 201  * specified explicitly, then no further symbol lookup is done. When
 202  * auto-detecting, the RTOS driver _detect() function must return success.
 203  *
 204  * The symbol is tried twice to handle the -flto case with gcc.  The first
 205  * attempt uses the symbol as-is, and the second attempt tries the symbol
 206  * with ".lto_priv.0" appended to it.  We only consider the first static
 207  * symbol here from the -flto case.  (Each subsequent static symbol with
 208  * the same name is exported as .lto_priv.1, .lto_priv.2, etc.)
 209  *
 210  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 211  */
 212 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 213 {
 214         int rtos_detected = 0;
 215         uint64_t addr = 0;
 216         size_t reply_len;
 217         char reply[GDB_BUFFER_SIZE + 1], cur_sym[GDB_BUFFER_SIZE / 2 + 1] = ""; /* Extra byte for null-termination */
 218         struct symbol_table_elem *next_sym = NULL;
 219         struct target *target = get_target_from_connection(connection);
 220         struct rtos *os = target->rtos;
 221
 222         reply_len = sprintf(reply, "OK");
 223
 224         if (!os)
 225                 goto done;
 226
 227         /* Decode any symbol name in the packet*/
 228         size_t len = unhexify((uint8_t *)cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 229         cur_sym[len] = 0;
 230
 231         const char no_suffix[] = "";
 232         const char lto_suffix[] = ".lto_priv.0";
 233         const size_t lto_suffix_len = strlen(lto_suffix);
 234
 235         const char *cur_suffix;
 236         const char *next_suffix;
 237
 238         /* Detect what suffix was used during the previous symbol lookup attempt, and
 239          * speculatively determine the next suffix (only used for the unknown address case) */
 240         if (len > lto_suffix_len && !strcmp(cur_sym + len - lto_suffix_len, lto_suffix)) {
 241                 /* Trim the suffix from cur_sym for comparison purposes below */
 242                 cur_sym[len - lto_suffix_len] = '\0';
 243                 cur_suffix = lto_suffix;
 244                 next_suffix = NULL;
 245         } else {
 246                 cur_suffix = no_suffix;
 247                 next_suffix = lto_suffix;
 248         }
 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
 253                 /* GDB could not find an address for the previous symbol */
 254                 struct symbol_table_elem *sym = find_symbol(os, cur_sym);
 255
 256                 if (next_suffix) {
 257                         next_sym = sym;
 258                 } else if (sym && !sym->optional) {     /* the symbol is mandatory for this RTOS */
 259                         if (!target->rtos_auto_detect) {
 260                                 LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 261                                 goto done;
 262                         } else {
 263                                 /* Autodetecting RTOS - try next RTOS */
 264                                 if (!rtos_try_next(target)) {
 265                                         LOG_WARNING("No RTOS could be auto-detected!");
 266                                         goto done;
 267                                 }
 268
 269                                 /* Next RTOS selected - invalidate current symbol */
 270                                 cur_sym[0] = '\x00';
 271                         }
 272                 }
 273         }
 274
 275         LOG_DEBUG("RTOS: Address of symbol '%s%s' is 0x%" PRIx64, cur_sym, cur_suffix, addr);
 276
 277         if (!next_sym) {
 278                 next_sym = next_symbol(os, cur_sym, addr);
 279                 next_suffix = no_suffix;
 280         }
 281
 282         /* Should never happen unless the debugger misbehaves */
 283         if (!next_sym) {
 284                 LOG_WARNING("RTOS: Debugger sent us qSymbol with '%s%s' that we did not ask for", cur_sym, cur_suffix);
 285                 goto done;
 286         }
 287
 288         if (!next_sym->symbol_name) {
 289                 /* No more symbols need looking up */
 290
 291                 if (!target->rtos_auto_detect) {
 292                         rtos_detected = 1;
 293                         goto done;
 294                 }
 295
 296                 if (os->type->detect_rtos(target)) {
 297                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 298                         rtos_detected = 1;
 299                         goto done;
 300                 } else {
 301                         LOG_WARNING("No RTOS could be auto-detected!");
 302                         goto done;
 303                 }
 304         }
 305
 306         assert(next_suffix);
 307
 308         reply_len = 8;                                   /* snprintf(..., "qSymbol:") */
 309         reply_len += 2 * strlen(next_sym->symbol_name);  /* hexify(..., next_sym->symbol_name, ...) */
 310         reply_len += 2 * strlen(next_suffix);            /* hexify(..., next_suffix, ...) */
 311         reply_len += 1;                                  /* Terminating NUL */
 312         if (reply_len > sizeof(reply)) {
 313                 LOG_ERROR("ERROR: RTOS symbol '%s%s' name is too long for GDB!", next_sym->symbol_name, next_suffix);
 314                 goto done;
 315         }
 316
 317         LOG_DEBUG("RTOS: Requesting symbol lookup of '%s%s' from the debugger", next_sym->symbol_name, next_suffix);
 318
 319         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 320         reply_len += hexify(reply + reply_len,
 321                 (const uint8_t *)next_sym->symbol_name, strlen(next_sym->symbol_name),
 322                 sizeof(reply) - reply_len);
 323         reply_len += hexify(reply + reply_len,
 324                 (const uint8_t *)next_suffix, strlen(next_suffix),
 325                 sizeof(reply) - reply_len);
 326
 327 done:
 328         gdb_put_packet(connection, reply, reply_len);
 329         return rtos_detected;
 330 }
 331
 332 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 333 {
 334         struct target *target = get_target_from_connection(connection);
 335
 336         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 337                 if ((target->rtos) && (target->rtos->thread_details) &&
 338                                 (target->rtos->thread_count != 0)) {
 339                         threadid_t threadid = 0;
 340                         int found = -1;
 341                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 342
 343                         if ((target->rtos) && (target->rtos->thread_details)) {
 344                                 int thread_num;
 345                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 346                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 347                                                 if (target->rtos->thread_details[thread_num].exists)
 348                                                         found = thread_num;
 349                                         }
 350                                 }
 351                         }
 352                         if (found == -1) {
 353                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 354                                 return ERROR_OK;
 355                         }
 356
 357                         struct thread_detail *detail = &target->rtos->thread_details[found];
 358
 359                         int str_size = 0;
 360                         if (detail->thread_name_str)
 361                                 str_size += strlen(detail->thread_name_str);
 362                         if (detail->extra_info_str)
 363                                 str_size += strlen(detail->extra_info_str);
 364
 365                         char *tmp_str = calloc(str_size + 9, sizeof(char));
 366                         char *tmp_str_ptr = tmp_str;
 367
 368                         if (detail->thread_name_str)
 369                                 tmp_str_ptr += sprintf(tmp_str_ptr, "Name: %s", detail->thread_name_str);
 370                         if (detail->extra_info_str) {
 371                                 if (tmp_str_ptr != tmp_str)
 372                                         tmp_str_ptr += sprintf(tmp_str_ptr, ", ");
 373                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 374                         }
 375
 376                         assert(strlen(tmp_str) ==
 377                                 (size_t) (tmp_str_ptr - tmp_str));
 378
 379                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 380                         size_t pkt_len = hexify(hex_str, (const uint8_t *)tmp_str,
 381                                 strlen(tmp_str), strlen(tmp_str) * 2 + 1);
 382
 383                         gdb_put_packet(connection, hex_str, pkt_len);
 384                         free(hex_str);
 385                         free(tmp_str);
 386                         return ERROR_OK;
 387
 388                 }
 389                 gdb_put_packet(connection, "", 0);
 390                 return ERROR_OK;
 391         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 392                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 393                         if (target->rtos_auto_detect == true) {
 394                                 target->rtos_auto_detect = false;
 395                                 target->rtos->type->create(target);
 396                         }
 397                         target->rtos->type->update_threads(target->rtos);
 398                 }
 399                 return ERROR_OK;
 400         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 401                 int i;
 402                 if (target->rtos) {
 403                         if (target->rtos->thread_count == 0) {
 404                                 gdb_put_packet(connection, "l", 1);
 405                         } else {
 406                                 /*thread id are 16 char +1 for ',' */
 407                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 408                                 char *tmp_str = out_str;
 409                                 for (i = 0; i < target->rtos->thread_count; i++) {
 410                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 411                                                                                 target->rtos->thread_details[i].threadid);
 412                                 }
 413                                 gdb_put_packet(connection, out_str, strlen(out_str));
 414                                 free(out_str);
 415                         }
 416                 } else
 417                         gdb_put_packet(connection, "l", 1);
 418
 419                 return ERROR_OK;
 420         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 421                 gdb_put_packet(connection, "l", 1);
 422                 return ERROR_OK;
 423         } else if (strncmp(packet, "qAttached", 9) == 0) {
 424                 gdb_put_packet(connection, "1", 1);
 425                 return ERROR_OK;
 426         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 427                 char offsets[] = "Text=0;Data=0;Bss=0";
 428                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 429                 return ERROR_OK;
 430         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 431                 /* make sure we check this before "qC" packet below
 432                  * otherwise it gets incorrectly handled */
 433                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 434         } else if (strncmp(packet, "qC", 2) == 0) {
 435                 if (target->rtos) {
 436                         char buffer[19];
 437                         int size;
 438                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 439                         gdb_put_packet(connection, buffer, size);
 440                 } else
 441                         gdb_put_packet(connection, "QC0", 3);
 442                 return ERROR_OK;
 443         } else if (packet[0] == 'T') {  /* Is thread alive? */
 444                 threadid_t threadid;
 445                 int found = -1;
 446                 sscanf(packet, "T%" SCNx64, &threadid);
 447                 if ((target->rtos) && (target->rtos->thread_details)) {
 448                         int thread_num;
 449                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 450                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 451                                         if (target->rtos->thread_details[thread_num].exists)
 452                                                 found = thread_num;
 453                                 }
 454                         }
 455                 }
 456                 if (found != -1)
 457                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 458                 else
 459                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 460                 return ERROR_OK;
 461         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 462                                          * all other operations ) */
 463                 if ((packet[1] == 'g') && (target->rtos)) {
 464                         threadid_t threadid;
 465                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 466                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 467                         /* threadid of 0 indicates target should choose */
 468                         if (threadid == 0)
 469                                 target->rtos->current_threadid = target->rtos->current_thread;
 470                         else
 471                                 target->rtos->current_threadid = threadid;
 472                 }
 473                 gdb_put_packet(connection, "OK", 2);
 474                 return ERROR_OK;
 475         }
 476
 477         return GDB_THREAD_PACKET_NOT_CONSUMED;
 478 }
 479
 480 static int rtos_put_gdb_reg_list(struct connection *connection,
 481                 struct rtos_reg *reg_list, int num_regs)
 482 {
 483         size_t num_bytes = 1; /* NUL */
 484         for (int i = 0; i < num_regs; ++i)
 485                 num_bytes += DIV_ROUND_UP(reg_list[i].size, 8) * 2;
 486
 487         char *hex = malloc(num_bytes);
 488         char *hex_p = hex;
 489
 490         for (int i = 0; i < num_regs; ++i) {
 491                 size_t count = DIV_ROUND_UP(reg_list[i].size, 8);
 492                 size_t n = hexify(hex_p, reg_list[i].value, count, num_bytes);
 493                 hex_p += n;
 494                 num_bytes -= n;
 495         }
 496
 497         gdb_put_packet(connection, hex, strlen(hex));
 498         free(hex);
 499
 500         return ERROR_OK;
 501 }
 502
 503 /** Look through all registers to find this register. */
 504 int rtos_get_gdb_reg(struct connection *connection, int reg_num)
 505 {
 506         struct target *target = get_target_from_connection(connection);
 507         int64_t current_threadid = target->rtos->current_threadid;
 508         if ((target->rtos) && (current_threadid != -1) &&
 509                         (current_threadid != 0) &&
 510                         ((current_threadid != target->rtos->current_thread) ||
 511                         (target->smp))) {       /* in smp several current thread are possible */
 512                 struct rtos_reg *reg_list;
 513                 int num_regs;
 514
 515                 LOG_DEBUG("getting register %d for thread 0x%" PRIx64
 516                                   ", target->rtos->current_thread=0x%" PRIx64,
 517                                                                                 reg_num,
 518                                                                                 current_threadid,
 519                                                                                 target->rtos->current_thread);
 520
 521                 int retval;
 522                 if (target->rtos->type->get_thread_reg) {
 523                         reg_list = calloc(1, sizeof(*reg_list));
 524                         num_regs = 1;
 525                         retval = target->rtos->type->get_thread_reg(target->rtos,
 526                                         current_threadid, reg_num, &reg_list[0]);
 527                         if (retval != ERROR_OK) {
 528                                 LOG_ERROR("RTOS: failed to get register %d", reg_num);
 529                                 return retval;
 530                         }
 531                 } else {
 532                         retval = target->rtos->type->get_thread_reg_list(target->rtos,
 533                                         current_threadid,
 534                                         &reg_list,
 535                                         &num_regs);
 536                         if (retval != ERROR_OK) {
 537                                 LOG_ERROR("RTOS: failed to get register list");
 538                                 return retval;
 539                         }
 540                 }
 541
 542                 for (int i = 0; i < num_regs; ++i) {
 543                         if (reg_list[i].number == (uint32_t)reg_num) {
 544                                 rtos_put_gdb_reg_list(connection, reg_list + i, 1);
 545                                 free(reg_list);
 546                                 return ERROR_OK;
 547                         }
 548                 }
 549
 550                 free(reg_list);
 551         }
 552         return ERROR_FAIL;
 553 }
 554
 555 /** Return a list of general registers. */
 556 int rtos_get_gdb_reg_list(struct connection *connection)
 557 {
 558         struct target *target = get_target_from_connection(connection);
 559         int64_t current_threadid = target->rtos->current_threadid;
 560         if ((target->rtos) && (current_threadid != -1) &&
 561                         (current_threadid != 0) &&
 562                         ((current_threadid != target->rtos->current_thread) ||
 563                         (target->smp))) {       /* in smp several current thread are possible */
 564                 struct rtos_reg *reg_list;
 565                 int num_regs;
 566
 567                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 568                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 569                                                                                 current_threadid,
 570                                                                                 target->rtos->current_thread);
 571
 572                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 573                                 current_threadid,
 574                                 &reg_list,
 575                                 &num_regs);
 576                 if (retval != ERROR_OK) {
 577                         LOG_ERROR("RTOS: failed to get register list");
 578                         return retval;
 579                 }
 580
 581                 rtos_put_gdb_reg_list(connection, reg_list, num_regs);
 582                 free(reg_list);
 583
 584                 return ERROR_OK;
 585         }
 586         return ERROR_FAIL;
 587 }
 588
 589 int rtos_set_reg(struct connection *connection, int reg_num,
 590                 uint8_t *reg_value)
 591 {
 592         struct target *target = get_target_from_connection(connection);
 593         int64_t current_threadid = target->rtos->current_threadid;
 594         if ((target->rtos) &&
 595                         (target->rtos->type->set_reg) &&
 596                         (current_threadid != -1) &&
 597                         (current_threadid != 0)) {
 598                 return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
 599         }
 600         return ERROR_FAIL;
 601 }
 602
 603 int rtos_generic_stack_read(struct target *target,
 604         const struct rtos_register_stacking *stacking,
 605         int64_t stack_ptr,
 606         struct rtos_reg **reg_list,
 607         int *num_regs)
 608 {
 609         int retval;
 610
 611         if (stack_ptr == 0) {
 612                 LOG_ERROR("Error: null stack pointer in thread");
 613                 return -5;
 614         }
 615         /* Read the stack */
 616         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 617         uint32_t address = stack_ptr;
 618
 619         if (stacking->stack_growth_direction == 1)
 620                 address -= stacking->stack_registers_size;
 621         if (stacking->read_stack)
 622                 retval = stacking->read_stack(target, address, stacking, stack_data);
 623         else
 624                 retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 625         if (retval != ERROR_OK) {
 626                 free(stack_data);
 627                 LOG_ERROR("Error reading stack frame from thread");
 628                 return retval;
 629         }
 630         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 631
 632 #if 0
 633                 LOG_OUTPUT("Stack Data :");
 634                 for (i = 0; i < stacking->stack_registers_size; i++)
 635                         LOG_OUTPUT("%02X", stack_data[i]);
 636                 LOG_OUTPUT("\r\n");
 637 #endif
 638
 639         target_addr_t new_stack_ptr;
 640         if (stacking->calculate_process_stack) {
 641                 new_stack_ptr = stacking->calculate_process_stack(target,
 642                                 stack_data, stacking, stack_ptr);
 643         } else {
 644                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 645                         stacking->stack_registers_size;
 646         }
 647
 648         *reg_list = calloc(stacking->num_output_registers, sizeof(struct rtos_reg));
 649         *num_regs = stacking->num_output_registers;
 650
 651         for (int i = 0; i < stacking->num_output_registers; ++i) {
 652                 (*reg_list)[i].number = stacking->register_offsets[i].number;
 653                 (*reg_list)[i].size = stacking->register_offsets[i].width_bits;
 654
 655                 int offset = stacking->register_offsets[i].offset;
 656                 if (offset == -2)
 657                         buf_cpy(&new_stack_ptr, (*reg_list)[i].value, (*reg_list)[i].size);
 658                 else if (offset != -1)
 659                         buf_cpy(stack_data + offset, (*reg_list)[i].value, (*reg_list)[i].size);
 660         }
 661
 662         free(stack_data);
 663 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 664         return ERROR_OK;
 665 }
 666
 667 static int rtos_try_next(struct target *target)
 668 {
 669         struct rtos *os = target->rtos;
 670         const struct rtos_type **type = rtos_types;
 671
 672         if (!os)
 673                 return 0;
 674
 675         while (*type && os->type != *type)
 676                 type++;
 677
 678         if (!*type || !*(++type))
 679                 return 0;
 680
 681         os->type = *type;
 682
 683         free(os->symbols);
 684         os->symbols = NULL;
 685
 686         return 1;
 687 }
 688
 689 int rtos_update_threads(struct target *target)
 690 {
 691         if ((target->rtos) && (target->rtos->type))
 692                 target->rtos->type->update_threads(target->rtos);
 693         return ERROR_OK;
 694 }
 695
 696 void rtos_free_threadlist(struct rtos *rtos)
 697 {
 698         if (rtos->thread_details) {
 699                 int j;
 700
 701                 for (j = 0; j < rtos->thread_count; j++) {
 702                         struct thread_detail *current_thread = &rtos->thread_details[j];
 703                         free(current_thread->thread_name_str);
 704                         free(current_thread->extra_info_str);
 705                 }
 706                 free(rtos->thread_details);
 707                 rtos->thread_details = NULL;
 708                 rtos->thread_count = 0;
 709                 rtos->current_threadid = -1;
 710                 rtos->current_thread = 0;
 711         }
 712 }
 713
 714 int rtos_read_buffer(struct target *target, target_addr_t address,
 715                 uint32_t size, uint8_t *buffer)
 716 {
 717         if (target->rtos->type->read_buffer)
 718                 return target->rtos->type->read_buffer(target->rtos, address, size, buffer);
 719         return ERROR_NOT_IMPLEMENTED;
 720 }
 721
 722 int rtos_write_buffer(struct target *target, target_addr_t address,
 723                 uint32_t size, const uint8_t *buffer)
 724 {
 725         if (target->rtos->type->write_buffer)
 726                 return target->rtos->type->write_buffer(target->rtos, address, size, buffer);
 727         return ERROR_NOT_IMPLEMENTED;
 728 }