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 /* RTOSs */
  19 extern struct rtos_type freertos_rtos;
  20 extern struct rtos_type threadx_rtos;
  21 extern struct rtos_type ecos_rtos;
  22 extern struct rtos_type linux_rtos;
  23 extern struct rtos_type chibios_rtos;
  24 extern struct rtos_type chromium_ec_rtos;
  25 extern struct rtos_type embkernel_rtos;
  26 extern struct rtos_type mqx_rtos;
  27 extern struct rtos_type ucos_iii_rtos;
  28 extern struct rtos_type nuttx_rtos;
  29 extern struct rtos_type hwthread_rtos;
  30 extern struct rtos_type riot_rtos;
  31 extern struct rtos_type zephyr_rtos;
  32
  33 static struct rtos_type *rtos_types[] = {
  34         &threadx_rtos,
  35         &freertos_rtos,
  36         &ecos_rtos,
  37         &linux_rtos,
  38         &chibios_rtos,
  39         &chromium_ec_rtos,
  40         &embkernel_rtos,
  41         &mqx_rtos,
  42         &ucos_iii_rtos,
  43         &nuttx_rtos,
  44         &riot_rtos,
  45         &zephyr_rtos,
  46         /* keep this as last, as it always matches with rtos auto */
  47         &hwthread_rtos,
  48         NULL
  49 };
  50
  51 static int rtos_try_next(struct target *target);
  52
  53 int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
  54
  55 int rtos_smp_init(struct target *target)
  56 {
  57         if (target->rtos->type->smp_init)
  58                 return target->rtos->type->smp_init(target);
  59         return ERROR_TARGET_INIT_FAILED;
  60 }
  61
  62 static int rtos_target_for_threadid(struct connection *connection, int64_t threadid, struct target **t)
  63 {
  64         struct target *curr = get_target_from_connection(connection);
  65         if (t)
  66                 *t = curr;
  67
  68         return ERROR_OK;
  69 }
  70
  71 static int os_alloc(struct target *target, struct rtos_type *ostype)
  72 {
  73         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  74
  75         if (!os)
  76                 return JIM_ERR;
  77
  78         os->type = ostype;
  79         os->current_threadid = -1;
  80         os->current_thread = 0;
  81         os->symbols = NULL;
  82         os->target = target;
  83
  84         /* RTOS drivers can override the packet handler in _create(). */
  85         os->gdb_thread_packet = rtos_thread_packet;
  86         os->gdb_target_for_threadid = rtos_target_for_threadid;
  87
  88         return JIM_OK;
  89 }
  90
  91 static void os_free(struct target *target)
  92 {
  93         if (!target->rtos)
  94                 return;
  95
  96         free(target->rtos->symbols);
  97         free(target->rtos);
  98         target->rtos = NULL;
  99 }
 100
 101 static int os_alloc_create(struct target *target, struct rtos_type *ostype)
 102 {
 103         int ret = os_alloc(target, ostype);
 104
 105         if (ret == JIM_OK) {
 106                 ret = target->rtos->type->create(target);
 107                 if (ret != JIM_OK)
 108                         os_free(target);
 109         }
 110
 111         return ret;
 112 }
 113
 114 int rtos_create(struct jim_getopt_info *goi, struct target *target)
 115 {
 116         int x;
 117         const char *cp;
 118         Jim_Obj *res;
 119         int e;
 120
 121         if (!goi->isconfigure && goi->argc != 0) {
 122                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 123                 return JIM_ERR;
 124         }
 125
 126         os_free(target);
 127
 128         e = jim_getopt_string(goi, &cp, NULL);
 129         if (e != JIM_OK)
 130                 return e;
 131
 132         if (strcmp(cp, "none") == 0)
 133                 return JIM_OK;
 134
 135         if (strcmp(cp, "auto") == 0) {
 136                 /* Auto detect tries to look up all symbols for each RTOS,
 137                  * and runs the RTOS driver's _detect() function when GDB
 138                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 139                 target->rtos_auto_detect = true;
 140
 141                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 142                  * target->rtos here, and set it to the first RTOS type. */
 143                 return os_alloc(target, rtos_types[0]);
 144         }
 145
 146         for (x = 0; rtos_types[x]; x++)
 147                 if (strcmp(cp, rtos_types[x]->name) == 0)
 148                         return os_alloc_create(target, rtos_types[x]);
 149
 150         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 151         res = Jim_GetResult(goi->interp);
 152         for (x = 0; rtos_types[x]; x++)
 153                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 154         Jim_AppendStrings(goi->interp, res, ", auto or none", NULL);
 155
 156         return JIM_ERR;
 157 }
 158
 159 void rtos_destroy(struct target *target)
 160 {
 161         os_free(target);
 162 }
 163
 164 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 165 {
 166         struct target *target = get_target_from_connection(connection);
 167         if (!target->rtos)
 168                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 169                                                                                  *found*/
 170         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 171 }
 172
 173 static struct symbol_table_elem *find_symbol(const struct rtos *os, const char *symbol)
 174 {
 175         struct symbol_table_elem *s;
 176
 177         for (s = os->symbols; s->symbol_name; s++)
 178                 if (!strcmp(s->symbol_name, symbol))
 179                         return s;
 180
 181         return NULL;
 182 }
 183
 184 static struct symbol_table_elem *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 185 {
 186         if (!os->symbols)
 187                 os->type->get_symbol_list_to_lookup(&os->symbols);
 188
 189         if (!cur_symbol[0])
 190                 return &os->symbols[0];
 191
 192         struct symbol_table_elem *s = find_symbol(os, cur_symbol);
 193         if (!s)
 194                 return NULL;
 195
 196         s->address = cur_addr;
 197         s++;
 198         return s;
 199 }
 200
 201 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 202  *
 203  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 204  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 205  *
 206  * If the qSymbol packet has no address that means GDB did not find the
 207  * symbol, in which case auto-detect will move on to try the next RTOS.
 208  *
 209  * rtos_qsymbol() then calls the next_symbol() helper function, which
 210  * iterates over symbol names for the current RTOS until it finds the
 211  * symbol in the received GDB packet, and then returns the next entry
 212  * in the list of symbols.
 213  *
 214  * If GDB replied about the last symbol for the RTOS and the RTOS was
 215  * specified explicitly, then no further symbol lookup is done. When
 216  * auto-detecting, the RTOS driver _detect() function must return success.
 217  *
 218  * The symbol is tried twice to handle the -flto case with gcc.  The first
 219  * attempt uses the symbol as-is, and the second attempt tries the symbol
 220  * with ".lto_priv.0" appended to it.  We only consider the first static
 221  * symbol here from the -flto case.  (Each subsequent static symbol with
 222  * the same name is exported as .lto_priv.1, .lto_priv.2, etc.)
 223  *
 224  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 225  */
 226 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 227 {
 228         int rtos_detected = 0;
 229         uint64_t addr = 0;
 230         size_t reply_len;
 231         char reply[GDB_BUFFER_SIZE + 1], cur_sym[GDB_BUFFER_SIZE / 2 + 1] = ""; /* Extra byte for null-termination */
 232         struct symbol_table_elem *next_sym = NULL;
 233         struct target *target = get_target_from_connection(connection);
 234         struct rtos *os = target->rtos;
 235
 236         reply_len = sprintf(reply, "OK");
 237
 238         if (!os)
 239                 goto done;
 240
 241         /* Decode any symbol name in the packet*/
 242         size_t len = unhexify((uint8_t *)cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 243         cur_sym[len] = 0;
 244
 245         const char no_suffix[] = "";
 246         const char lto_suffix[] = ".lto_priv.0";
 247         const size_t lto_suffix_len = strlen(lto_suffix);
 248
 249         const char *cur_suffix;
 250         const char *next_suffix;
 251
 252         /* Detect what suffix was used during the previous symbol lookup attempt, and
 253          * speculatively determine the next suffix (only used for the unknown address case) */
 254         if (len > lto_suffix_len && !strcmp(cur_sym + len - lto_suffix_len, lto_suffix)) {
 255                 /* Trim the suffix from cur_sym for comparison purposes below */
 256                 cur_sym[len - lto_suffix_len] = '\0';
 257                 cur_suffix = lto_suffix;
 258                 next_suffix = NULL;
 259         } else {
 260                 cur_suffix = no_suffix;
 261                 next_suffix = lto_suffix;
 262         }
 263
 264         if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
 265             (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr))) { /* GDB did not find an address for a symbol */
 266
 267                 /* GDB could not find an address for the previous symbol */
 268                 struct symbol_table_elem *sym = find_symbol(os, cur_sym);
 269
 270                 if (next_suffix) {
 271                         next_sym = sym;
 272                 } else if (sym && !sym->optional) {     /* the symbol is mandatory for this RTOS */
 273                         if (!target->rtos_auto_detect) {
 274                                 LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 275                                 goto done;
 276                         } else {
 277                                 /* Autodetecting RTOS - try next RTOS */
 278                                 if (!rtos_try_next(target)) {
 279                                         LOG_WARNING("No RTOS could be auto-detected!");
 280                                         goto done;
 281                                 }
 282
 283                                 /* Next RTOS selected - invalidate current symbol */
 284                                 cur_sym[0] = '\x00';
 285                         }
 286                 }
 287         }
 288
 289         LOG_DEBUG("RTOS: Address of symbol '%s%s' is 0x%" PRIx64, cur_sym, cur_suffix, addr);
 290
 291         if (!next_sym) {
 292                 next_sym = next_symbol(os, cur_sym, addr);
 293                 next_suffix = no_suffix;
 294         }
 295
 296         /* Should never happen unless the debugger misbehaves */
 297         if (!next_sym) {
 298                 LOG_WARNING("RTOS: Debugger sent us qSymbol with '%s%s' that we did not ask for", cur_sym, cur_suffix);
 299                 goto done;
 300         }
 301
 302         if (!next_sym->symbol_name) {
 303                 /* No more symbols need looking up */
 304
 305                 if (!target->rtos_auto_detect) {
 306                         rtos_detected = 1;
 307                         goto done;
 308                 }
 309
 310                 if (os->type->detect_rtos(target)) {
 311                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 312                         rtos_detected = 1;
 313                         goto done;
 314                 } else {
 315                         LOG_WARNING("No RTOS could be auto-detected!");
 316                         goto done;
 317                 }
 318         }
 319
 320         assert(next_suffix);
 321
 322         reply_len = 8;                                   /* snprintf(..., "qSymbol:") */
 323         reply_len += 2 * strlen(next_sym->symbol_name);  /* hexify(..., next_sym->symbol_name, ...) */
 324         reply_len += 2 * strlen(next_suffix);            /* hexify(..., next_suffix, ...) */
 325         reply_len += 1;                                  /* Terminating NUL */
 326         if (reply_len > sizeof(reply)) {
 327                 LOG_ERROR("ERROR: RTOS symbol '%s%s' name is too long for GDB!", next_sym->symbol_name, next_suffix);
 328                 goto done;
 329         }
 330
 331         LOG_DEBUG("RTOS: Requesting symbol lookup of '%s%s' from the debugger", next_sym->symbol_name, next_suffix);
 332
 333         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 334         reply_len += hexify(reply + reply_len,
 335                 (const uint8_t *)next_sym->symbol_name, strlen(next_sym->symbol_name),
 336                 sizeof(reply) - reply_len);
 337         reply_len += hexify(reply + reply_len,
 338                 (const uint8_t *)next_suffix, strlen(next_suffix),
 339                 sizeof(reply) - reply_len);
 340
 341 done:
 342         gdb_put_packet(connection, reply, reply_len);
 343         return rtos_detected;
 344 }
 345
 346 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 347 {
 348         struct target *target = get_target_from_connection(connection);
 349
 350         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 351                 if ((target->rtos) && (target->rtos->thread_details) &&
 352                                 (target->rtos->thread_count != 0)) {
 353                         threadid_t threadid = 0;
 354                         int found = -1;
 355                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 356
 357                         if ((target->rtos) && (target->rtos->thread_details)) {
 358                                 int thread_num;
 359                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 360                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 361                                                 if (target->rtos->thread_details[thread_num].exists)
 362                                                         found = thread_num;
 363                                         }
 364                                 }
 365                         }
 366                         if (found == -1) {
 367                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 368                                 return ERROR_OK;
 369                         }
 370
 371                         struct thread_detail *detail = &target->rtos->thread_details[found];
 372
 373                         int str_size = 0;
 374                         if (detail->thread_name_str)
 375                                 str_size += strlen(detail->thread_name_str);
 376                         if (detail->extra_info_str)
 377                                 str_size += strlen(detail->extra_info_str);
 378
 379                         char *tmp_str = calloc(str_size + 9, sizeof(char));
 380                         char *tmp_str_ptr = tmp_str;
 381
 382                         if (detail->thread_name_str)
 383                                 tmp_str_ptr += sprintf(tmp_str_ptr, "Name: %s", detail->thread_name_str);
 384                         if (detail->extra_info_str) {
 385                                 if (tmp_str_ptr != tmp_str)
 386                                         tmp_str_ptr += sprintf(tmp_str_ptr, ", ");
 387                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 388                         }
 389
 390                         assert(strlen(tmp_str) ==
 391                                 (size_t) (tmp_str_ptr - tmp_str));
 392
 393                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 394                         size_t pkt_len = hexify(hex_str, (const uint8_t *)tmp_str,
 395                                 strlen(tmp_str), strlen(tmp_str) * 2 + 1);
 396
 397                         gdb_put_packet(connection, hex_str, pkt_len);
 398                         free(hex_str);
 399                         free(tmp_str);
 400                         return ERROR_OK;
 401
 402                 }
 403                 gdb_put_packet(connection, "", 0);
 404                 return ERROR_OK;
 405         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 406                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 407                         if (target->rtos_auto_detect == true) {
 408                                 target->rtos_auto_detect = false;
 409                                 target->rtos->type->create(target);
 410                         }
 411                         target->rtos->type->update_threads(target->rtos);
 412                 }
 413                 return ERROR_OK;
 414         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 415                 int i;
 416                 if (target->rtos) {
 417                         if (target->rtos->thread_count == 0) {
 418                                 gdb_put_packet(connection, "l", 1);
 419                         } else {
 420                                 /*thread id are 16 char +1 for ',' */
 421                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 422                                 char *tmp_str = out_str;
 423                                 for (i = 0; i < target->rtos->thread_count; i++) {
 424                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 425                                                                                 target->rtos->thread_details[i].threadid);
 426                                 }
 427                                 gdb_put_packet(connection, out_str, strlen(out_str));
 428                                 free(out_str);
 429                         }
 430                 } else
 431                         gdb_put_packet(connection, "l", 1);
 432
 433                 return ERROR_OK;
 434         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 435                 gdb_put_packet(connection, "l", 1);
 436                 return ERROR_OK;
 437         } else if (strncmp(packet, "qAttached", 9) == 0) {
 438                 gdb_put_packet(connection, "1", 1);
 439                 return ERROR_OK;
 440         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 441                 char offsets[] = "Text=0;Data=0;Bss=0";
 442                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 443                 return ERROR_OK;
 444         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 445                 /* make sure we check this before "qC" packet below
 446                  * otherwise it gets incorrectly handled */
 447                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 448         } else if (strncmp(packet, "qC", 2) == 0) {
 449                 if (target->rtos) {
 450                         char buffer[19];
 451                         int size;
 452                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 453                         gdb_put_packet(connection, buffer, size);
 454                 } else
 455                         gdb_put_packet(connection, "QC0", 3);
 456                 return ERROR_OK;
 457         } else if (packet[0] == 'T') {  /* Is thread alive? */
 458                 threadid_t threadid;
 459                 int found = -1;
 460                 sscanf(packet, "T%" SCNx64, &threadid);
 461                 if ((target->rtos) && (target->rtos->thread_details)) {
 462                         int thread_num;
 463                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 464                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 465                                         if (target->rtos->thread_details[thread_num].exists)
 466                                                 found = thread_num;
 467                                 }
 468                         }
 469                 }
 470                 if (found != -1)
 471                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 472                 else
 473                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 474                 return ERROR_OK;
 475         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 476                                          * all other operations ) */
 477                 if ((packet[1] == 'g') && (target->rtos)) {
 478                         threadid_t threadid;
 479                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 480                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 481                         /* threadid of 0 indicates target should choose */
 482                         if (threadid == 0)
 483                                 target->rtos->current_threadid = target->rtos->current_thread;
 484                         else
 485                                 target->rtos->current_threadid = threadid;
 486                 }
 487                 gdb_put_packet(connection, "OK", 2);
 488                 return ERROR_OK;
 489         }
 490
 491         return GDB_THREAD_PACKET_NOT_CONSUMED;
 492 }
 493
 494 static int rtos_put_gdb_reg_list(struct connection *connection,
 495                 struct rtos_reg *reg_list, int num_regs)
 496 {
 497         size_t num_bytes = 1; /* NUL */
 498         for (int i = 0; i < num_regs; ++i)
 499                 num_bytes += DIV_ROUND_UP(reg_list[i].size, 8) * 2;
 500
 501         char *hex = malloc(num_bytes);
 502         char *hex_p = hex;
 503
 504         for (int i = 0; i < num_regs; ++i) {
 505                 size_t count = DIV_ROUND_UP(reg_list[i].size, 8);
 506                 size_t n = hexify(hex_p, reg_list[i].value, count, num_bytes);
 507                 hex_p += n;
 508                 num_bytes -= n;
 509         }
 510
 511         gdb_put_packet(connection, hex, strlen(hex));
 512         free(hex);
 513
 514         return ERROR_OK;
 515 }
 516
 517 /** Look through all registers to find this register. */
 518 int rtos_get_gdb_reg(struct connection *connection, int reg_num)
 519 {
 520         struct target *target = get_target_from_connection(connection);
 521         int64_t current_threadid = target->rtos->current_threadid;
 522         if ((target->rtos) && (current_threadid != -1) &&
 523                         (current_threadid != 0) &&
 524                         ((current_threadid != target->rtos->current_thread) ||
 525                         (target->smp))) {       /* in smp several current thread are possible */
 526                 struct rtos_reg *reg_list;
 527                 int num_regs;
 528
 529                 LOG_DEBUG("getting register %d for thread 0x%" PRIx64
 530                                   ", target->rtos->current_thread=0x%" PRIx64,
 531                                                                                 reg_num,
 532                                                                                 current_threadid,
 533                                                                                 target->rtos->current_thread);
 534
 535                 int retval;
 536                 if (target->rtos->type->get_thread_reg) {
 537                         reg_list = calloc(1, sizeof(*reg_list));
 538                         num_regs = 1;
 539                         retval = target->rtos->type->get_thread_reg(target->rtos,
 540                                         current_threadid, reg_num, &reg_list[0]);
 541                         if (retval != ERROR_OK) {
 542                                 LOG_ERROR("RTOS: failed to get register %d", reg_num);
 543                                 return retval;
 544                         }
 545                 } else {
 546                         retval = target->rtos->type->get_thread_reg_list(target->rtos,
 547                                         current_threadid,
 548                                         &reg_list,
 549                                         &num_regs);
 550                         if (retval != ERROR_OK) {
 551                                 LOG_ERROR("RTOS: failed to get register list");
 552                                 return retval;
 553                         }
 554                 }
 555
 556                 for (int i = 0; i < num_regs; ++i) {
 557                         if (reg_list[i].number == (uint32_t)reg_num) {
 558                                 rtos_put_gdb_reg_list(connection, reg_list + i, 1);
 559                                 free(reg_list);
 560                                 return ERROR_OK;
 561                         }
 562                 }
 563
 564                 free(reg_list);
 565         }
 566         return ERROR_FAIL;
 567 }
 568
 569 /** Return a list of general registers. */
 570 int rtos_get_gdb_reg_list(struct connection *connection)
 571 {
 572         struct target *target = get_target_from_connection(connection);
 573         int64_t current_threadid = target->rtos->current_threadid;
 574         if ((target->rtos) && (current_threadid != -1) &&
 575                         (current_threadid != 0) &&
 576                         ((current_threadid != target->rtos->current_thread) ||
 577                         (target->smp))) {       /* in smp several current thread are possible */
 578                 struct rtos_reg *reg_list;
 579                 int num_regs;
 580
 581                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 582                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 583                                                                                 current_threadid,
 584                                                                                 target->rtos->current_thread);
 585
 586                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 587                                 current_threadid,
 588                                 &reg_list,
 589                                 &num_regs);
 590                 if (retval != ERROR_OK) {
 591                         LOG_ERROR("RTOS: failed to get register list");
 592                         return retval;
 593                 }
 594
 595                 rtos_put_gdb_reg_list(connection, reg_list, num_regs);
 596                 free(reg_list);
 597
 598                 return ERROR_OK;
 599         }
 600         return ERROR_FAIL;
 601 }
 602
 603 int rtos_set_reg(struct connection *connection, int reg_num,
 604                 uint8_t *reg_value)
 605 {
 606         struct target *target = get_target_from_connection(connection);
 607         int64_t current_threadid = target->rtos->current_threadid;
 608         if ((target->rtos) &&
 609                         (target->rtos->type->set_reg) &&
 610                         (current_threadid != -1) &&
 611                         (current_threadid != 0)) {
 612                 return target->rtos->type->set_reg(target->rtos, reg_num, reg_value);
 613         }
 614         return ERROR_FAIL;
 615 }
 616
 617 int rtos_generic_stack_read(struct target *target,
 618         const struct rtos_register_stacking *stacking,
 619         int64_t stack_ptr,
 620         struct rtos_reg **reg_list,
 621         int *num_regs)
 622 {
 623         int retval;
 624
 625         if (stack_ptr == 0) {
 626                 LOG_ERROR("Error: null stack pointer in thread");
 627                 return -5;
 628         }
 629         /* Read the stack */
 630         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 631         uint32_t address = stack_ptr;
 632
 633         if (stacking->stack_growth_direction == 1)
 634                 address -= stacking->stack_registers_size;
 635         if (stacking->read_stack)
 636                 retval = stacking->read_stack(target, address, stacking, stack_data);
 637         else
 638                 retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 639         if (retval != ERROR_OK) {
 640                 free(stack_data);
 641                 LOG_ERROR("Error reading stack frame from thread");
 642                 return retval;
 643         }
 644         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 645
 646 #if 0
 647                 LOG_OUTPUT("Stack Data :");
 648                 for (i = 0; i < stacking->stack_registers_size; i++)
 649                         LOG_OUTPUT("%02X", stack_data[i]);
 650                 LOG_OUTPUT("\r\n");
 651 #endif
 652
 653         target_addr_t new_stack_ptr;
 654         if (stacking->calculate_process_stack) {
 655                 new_stack_ptr = stacking->calculate_process_stack(target,
 656                                 stack_data, stacking, stack_ptr);
 657         } else {
 658                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 659                         stacking->stack_registers_size;
 660         }
 661
 662         *reg_list = calloc(stacking->num_output_registers, sizeof(struct rtos_reg));
 663         *num_regs = stacking->num_output_registers;
 664
 665         for (int i = 0; i < stacking->num_output_registers; ++i) {
 666                 (*reg_list)[i].number = stacking->register_offsets[i].number;
 667                 (*reg_list)[i].size = stacking->register_offsets[i].width_bits;
 668
 669                 int offset = stacking->register_offsets[i].offset;
 670                 if (offset == -2)
 671                         buf_cpy(&new_stack_ptr, (*reg_list)[i].value, (*reg_list)[i].size);
 672                 else if (offset != -1)
 673                         buf_cpy(stack_data + offset, (*reg_list)[i].value, (*reg_list)[i].size);
 674         }
 675
 676         free(stack_data);
 677 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 678         return ERROR_OK;
 679 }
 680
 681 static int rtos_try_next(struct target *target)
 682 {
 683         struct rtos *os = target->rtos;
 684         struct rtos_type **type = rtos_types;
 685
 686         if (!os)
 687                 return 0;
 688
 689         while (*type && os->type != *type)
 690                 type++;
 691
 692         if (!*type || !*(++type))
 693                 return 0;
 694
 695         os->type = *type;
 696
 697         free(os->symbols);
 698         os->symbols = NULL;
 699
 700         return 1;
 701 }
 702
 703 int rtos_update_threads(struct target *target)
 704 {
 705         if ((target->rtos) && (target->rtos->type))
 706                 target->rtos->type->update_threads(target->rtos);
 707         return ERROR_OK;
 708 }
 709
 710 void rtos_free_threadlist(struct rtos *rtos)
 711 {
 712         if (rtos->thread_details) {
 713                 int j;
 714
 715                 for (j = 0; j < rtos->thread_count; j++) {
 716                         struct thread_detail *current_thread = &rtos->thread_details[j];
 717                         free(current_thread->thread_name_str);
 718                         free(current_thread->extra_info_str);
 719                 }
 720                 free(rtos->thread_details);
 721                 rtos->thread_details = NULL;
 722                 rtos->thread_count = 0;
 723                 rtos->current_threadid = -1;
 724                 rtos->current_thread = 0;
 725         }
 726 }
 727
 728 int rtos_read_buffer(struct target *target, target_addr_t address,
 729                 uint32_t size, uint8_t *buffer)
 730 {
 731         if (target->rtos->type->read_buffer)
 732                 return target->rtos->type->read_buffer(target->rtos, address, size, buffer);
 733         return ERROR_NOT_IMPLEMENTED;
 734 }
 735
 736 int rtos_write_buffer(struct target *target, target_addr_t address,
 737                 uint32_t size, const uint8_t *buffer)
 738 {
 739         if (target->rtos->type->write_buffer)
 740                 return target->rtos->type->write_buffer(target->rtos, address, size, buffer);
 741         return ERROR_NOT_IMPLEMENTED;
 742 }