src/rtos/rtos.c

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Broadcom Corporation                            *
   3  *   Evan Hunter - ehunter@broadcom.com                                    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  17  ***************************************************************************/
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include "rtos.h"
  24 #include "target/target.h"
  25 #include "helper/log.h"
  26 #include "helper/binarybuffer.h"
  27 #include "server/gdb_server.h"
  28
  29 /* RTOSs */
  30 extern struct rtos_type FreeRTOS_rtos;
  31 extern struct rtos_type ThreadX_rtos;
  32 extern struct rtos_type eCos_rtos;
  33 extern struct rtos_type Linux_os;
  34 extern struct rtos_type ChibiOS_rtos;
  35 extern struct rtos_type embKernel_rtos;
  36 extern struct rtos_type mqx_rtos;
  37 extern struct rtos_type uCOS_III_rtos;
  38
  39 static struct rtos_type *rtos_types[] = {
  40         &ThreadX_rtos,
  41         &FreeRTOS_rtos,
  42         &eCos_rtos,
  43         &Linux_os,
  44         &ChibiOS_rtos,
  45         &embKernel_rtos,
  46         &mqx_rtos,
  47         &uCOS_III_rtos,
  48         NULL
  49 };
  50
  51 int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
  52
  53 int rtos_smp_init(struct target *target)
  54 {
  55         if (target->rtos->type->smp_init)
  56                 return target->rtos->type->smp_init(target);
  57         return ERROR_TARGET_INIT_FAILED;
  58 }
  59
  60 static int os_alloc(struct target *target, struct rtos_type *ostype)
  61 {
  62         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  63
  64         if (!os)
  65                 return JIM_ERR;
  66
  67         os->type = ostype;
  68         os->current_threadid = -1;
  69         os->current_thread = 0;
  70         os->symbols = NULL;
  71         os->target = target;
  72
  73         /* RTOS drivers can override the packet handler in _create(). */
  74         os->gdb_thread_packet = rtos_thread_packet;
  75
  76         return JIM_OK;
  77 }
  78
  79 static void os_free(struct target *target)
  80 {
  81         if (!target->rtos)
  82                 return;
  83
  84         if (target->rtos->symbols)
  85                 free(target->rtos->symbols);
  86
  87         free(target->rtos);
  88         target->rtos = NULL;
  89 }
  90
  91 static int os_alloc_create(struct target *target, struct rtos_type *ostype)
  92 {
  93         int ret = os_alloc(target, ostype);
  94
  95         if (JIM_OK == ret) {
  96                 ret = target->rtos->type->create(target);
  97                 if (ret != JIM_OK)
  98                         os_free(target);
  99         }
 100
 101         return ret;
 102 }
 103
 104 int rtos_create(Jim_GetOptInfo *goi, struct target *target)
 105 {
 106         int x;
 107         const char *cp;
 108         struct Jim_Obj *res;
 109         int e;
 110
 111         if (!goi->isconfigure && goi->argc != 0) {
 112                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 113                 return JIM_ERR;
 114         }
 115
 116         os_free(target);
 117
 118         e = Jim_GetOpt_String(goi, &cp, NULL);
 119         if (e != JIM_OK)
 120                 return e;
 121
 122         if (0 == strcmp(cp, "auto")) {
 123                 /* Auto detect tries to look up all symbols for each RTOS,
 124                  * and runs the RTOS driver's _detect() function when GDB
 125                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 126                 target->rtos_auto_detect = true;
 127
 128                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 129                  * target->rtos here, and set it to the first RTOS type. */
 130                 return os_alloc(target, rtos_types[0]);
 131         }
 132
 133         for (x = 0; rtos_types[x]; x++)
 134                 if (0 == strcmp(cp, rtos_types[x]->name))
 135                         return os_alloc_create(target, rtos_types[x]);
 136
 137         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 138         res = Jim_GetResult(goi->interp);
 139         for (x = 0; rtos_types[x]; x++)
 140                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 141         Jim_AppendStrings(goi->interp, res, " or auto", NULL);
 142
 143         return JIM_ERR;
 144 }
 145
 146 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 147 {
 148         struct target *target = get_target_from_connection(connection);
 149         if (target->rtos == NULL)
 150                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 151                                                                                  *found*/
 152         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 153 }
 154
 155 static symbol_table_elem_t *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 156 {
 157         symbol_table_elem_t *s;
 158
 159         if (!os->symbols)
 160                 os->type->get_symbol_list_to_lookup(&os->symbols);
 161
 162         if (!cur_symbol[0])
 163                 return &os->symbols[0];
 164
 165         for (s = os->symbols; s->symbol_name; s++)
 166                 if (!strcmp(s->symbol_name, cur_symbol)) {
 167                         s->address = cur_addr;
 168                         s++;
 169                         return s;
 170                 }
 171
 172         return NULL;
 173 }
 174
 175 /* searches for 'symbol' in the lookup table for 'os' and returns TRUE,
 176  * if 'symbol' is not declared optional */
 177 static bool is_symbol_mandatory(const struct rtos *os, const char *symbol)
 178 {
 179         for (symbol_table_elem_t *s = os->symbols; s->symbol_name; ++s) {
 180                 if (!strcmp(s->symbol_name, symbol))
 181                         return !s->optional;
 182         }
 183         return false;
 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  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 204  */
 205 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 206 {
 207         int rtos_detected = 0;
 208         uint64_t addr = 0;
 209         size_t reply_len;
 210         char reply[GDB_BUFFER_SIZE], cur_sym[GDB_BUFFER_SIZE / 2] = "";
 211         symbol_table_elem_t *next_sym = NULL;
 212         struct target *target = get_target_from_connection(connection);
 213         struct rtos *os = target->rtos;
 214
 215         reply_len = sprintf(reply, "OK");
 216
 217         if (!os)
 218                 goto done;
 219
 220         /* Decode any symbol name in the packet*/
 221         size_t len = unhexify((uint8_t *)cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 222         cur_sym[len] = 0;
 223
 224         if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
 225             (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr)) && /* GDB did not find an address for a symbol */
 226             is_symbol_mandatory(os, cur_sym)) {                                 /* the symbol is mandatory for this RTOS */
 227
 228                 /* GDB could not find an address for the previous symbol */
 229                 if (!target->rtos_auto_detect) {
 230                         LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 231                         goto done;
 232                 } else {
 233                         /* Autodetecting RTOS - try next RTOS */
 234                         if (!rtos_try_next(target)) {
 235                                 LOG_WARNING("No RTOS could be auto-detected!");
 236                                 goto done;
 237                         }
 238
 239                         /* Next RTOS selected - invalidate current symbol */
 240                         cur_sym[0] = '\x00';
 241                 }
 242         }
 243         next_sym = next_symbol(os, cur_sym, addr);
 244
 245         if (!next_sym->symbol_name) {
 246                 /* No more symbols need looking up */
 247
 248                 if (!target->rtos_auto_detect) {
 249                         rtos_detected = 1;
 250                         goto done;
 251                 }
 252
 253                 if (os->type->detect_rtos(target)) {
 254                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 255                         rtos_detected = 1;
 256                         goto done;
 257                 } else {
 258                         LOG_WARNING("No RTOS could be auto-detected!");
 259                         goto done;
 260                 }
 261         }
 262
 263         if (8 + (strlen(next_sym->symbol_name) * 2) + 1 > sizeof(reply)) {
 264                 LOG_ERROR("ERROR: RTOS symbol '%s' name is too long for GDB!", next_sym->symbol_name);
 265                 goto done;
 266         }
 267
 268         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 269         reply_len += hexify(reply + reply_len, next_sym->symbol_name, 0, sizeof(reply) - reply_len);
 270
 271 done:
 272         gdb_put_packet(connection, reply, reply_len);
 273         return rtos_detected;
 274 }
 275
 276 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 277 {
 278         struct target *target = get_target_from_connection(connection);
 279
 280         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 281                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL) &&
 282                                 (target->rtos->thread_count != 0)) {
 283                         threadid_t threadid = 0;
 284                         int found = -1;
 285                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 286
 287                         if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 288                                 int thread_num;
 289                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 290                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 291                                                 if (target->rtos->thread_details[thread_num].exists)
 292                                                         found = thread_num;
 293                                         }
 294                                 }
 295                         }
 296                         if (found == -1) {
 297                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 298                                 return ERROR_OK;
 299                         }
 300
 301                         struct thread_detail *detail = &target->rtos->thread_details[found];
 302
 303                         int str_size = 0;
 304                         if (detail->thread_name_str != NULL)
 305                                 str_size += strlen(detail->thread_name_str);
 306                         if (detail->extra_info_str != NULL)
 307                                 str_size += strlen(detail->extra_info_str);
 308
 309                         char *tmp_str = calloc(str_size + 4, sizeof(char));
 310                         char *tmp_str_ptr = tmp_str;
 311
 312                         if (detail->thread_name_str != NULL)
 313                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->thread_name_str);
 314                         if (detail->extra_info_str != NULL) {
 315                                 if (tmp_str_ptr != tmp_str)
 316                                         tmp_str_ptr += sprintf(tmp_str_ptr, " : ");
 317                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->extra_info_str);
 318                         }
 319
 320                         assert(strlen(tmp_str) ==
 321                                 (size_t) (tmp_str_ptr - tmp_str));
 322
 323                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 324                         int pkt_len = hexify(hex_str, tmp_str, 0, strlen(tmp_str) * 2 + 1);
 325
 326                         gdb_put_packet(connection, hex_str, pkt_len);
 327                         free(hex_str);
 328                         free(tmp_str);
 329                         return ERROR_OK;
 330
 331                 }
 332                 gdb_put_packet(connection, "", 0);
 333                 return ERROR_OK;
 334         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 335                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 336                         target->rtos_auto_detect = false;
 337                         target->rtos->type->create(target);
 338                         target->rtos->type->update_threads(target->rtos);
 339                 }
 340                 return ERROR_OK;
 341         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 342                 int i;
 343                 if (target->rtos != NULL) {
 344                         if (target->rtos->thread_count == 0) {
 345                                 gdb_put_packet(connection, "l", 1);
 346                         } else {
 347                                 /*thread id are 16 char +1 for ',' */
 348                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 349                                 char *tmp_str = out_str;
 350                                 for (i = 0; i < target->rtos->thread_count; i++) {
 351                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 352                                                                                 target->rtos->thread_details[i].threadid);
 353                                 }
 354                                 gdb_put_packet(connection, out_str, strlen(out_str));
 355                                 free(out_str);
 356                         }
 357                 } else
 358                         gdb_put_packet(connection, "l", 1);
 359
 360                 return ERROR_OK;
 361         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 362                 gdb_put_packet(connection, "l", 1);
 363                 return ERROR_OK;
 364         } else if (strncmp(packet, "qAttached", 9) == 0) {
 365                 gdb_put_packet(connection, "1", 1);
 366                 return ERROR_OK;
 367         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 368                 char offsets[] = "Text=0;Data=0;Bss=0";
 369                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 370                 return ERROR_OK;
 371         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 372                 /* make sure we check this before "qC" packet below
 373                  * otherwise it gets incorrectly handled */
 374                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 375         } else if (strncmp(packet, "qC", 2) == 0) {
 376                 if (target->rtos != NULL) {
 377                         char buffer[19];
 378                         int size;
 379                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 380                         gdb_put_packet(connection, buffer, size);
 381                 } else
 382                         gdb_put_packet(connection, "QC0", 3);
 383                 return ERROR_OK;
 384         } else if (packet[0] == 'T') {  /* Is thread alive? */
 385                 threadid_t threadid;
 386                 int found = -1;
 387                 sscanf(packet, "T%" SCNx64, &threadid);
 388                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 389                         int thread_num;
 390                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 391                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 392                                         if (target->rtos->thread_details[thread_num].exists)
 393                                                 found = thread_num;
 394                                 }
 395                         }
 396                 }
 397                 if (found != -1)
 398                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 399                 else
 400                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 401                 return ERROR_OK;
 402         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 403                                          * all other operations ) */
 404                 if ((packet[1] == 'g') && (target->rtos != NULL)) {
 405                         threadid_t threadid;
 406                         sscanf(packet, "Hg%16" SCNx64, &threadid);
 407                         LOG_DEBUG("RTOS: GDB requested to set current thread to 0x%" PRIx64, threadid);
 408                         /* threadid of 0 indicates target should choose */
 409                         if (threadid == 0)
 410                                 target->rtos->current_threadid = target->rtos->current_thread;
 411                         else
 412                                 target->rtos->current_threadid = threadid;
 413                 }
 414                 gdb_put_packet(connection, "OK", 2);
 415                 return ERROR_OK;
 416         }
 417
 418         return GDB_THREAD_PACKET_NOT_CONSUMED;
 419 }
 420
 421 int rtos_get_gdb_reg_list(struct connection *connection)
 422 {
 423         struct target *target = get_target_from_connection(connection);
 424         int64_t current_threadid = target->rtos->current_threadid;
 425         if ((target->rtos != NULL) && (current_threadid != -1) &&
 426                         (current_threadid != 0) &&
 427                         ((current_threadid != target->rtos->current_thread) ||
 428                         (target->smp))) {       /* in smp several current thread are possible */
 429                 char *hex_reg_list;
 430
 431                 LOG_DEBUG("RTOS: getting register list for thread 0x%" PRIx64
 432                                   ", target->rtos->current_thread=0x%" PRIx64 "\r\n",
 433                                                                                 current_threadid,
 434                                                                                 target->rtos->current_thread);
 435
 436                 int retval = target->rtos->type->get_thread_reg_list(target->rtos,
 437                                 current_threadid,
 438                                 &hex_reg_list);
 439                 if (retval != ERROR_OK) {
 440                         LOG_ERROR("RTOS: failed to get register list");
 441                         return retval;
 442                 }
 443
 444                 if (hex_reg_list != NULL) {
 445                         gdb_put_packet(connection, hex_reg_list, strlen(hex_reg_list));
 446                         free(hex_reg_list);
 447                         return ERROR_OK;
 448                 }
 449         }
 450         return ERROR_FAIL;
 451 }
 452
 453 int rtos_generic_stack_read(struct target *target,
 454         const struct rtos_register_stacking *stacking,
 455         int64_t stack_ptr,
 456         char **hex_reg_list)
 457 {
 458         int list_size = 0;
 459         char *tmp_str_ptr;
 460         int64_t new_stack_ptr;
 461         int i;
 462         int retval;
 463
 464         if (stack_ptr == 0) {
 465                 LOG_ERROR("Error: null stack pointer in thread");
 466                 return -5;
 467         }
 468         /* Read the stack */
 469         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 470         uint32_t address = stack_ptr;
 471
 472         if (stacking->stack_growth_direction == 1)
 473                 address -= stacking->stack_registers_size;
 474         retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 475         if (retval != ERROR_OK) {
 476                 free(stack_data);
 477                 LOG_ERROR("Error reading stack frame from thread");
 478                 return retval;
 479         }
 480         LOG_DEBUG("RTOS: Read stack frame at 0x%" PRIx32, address);
 481
 482 #if 0
 483                 LOG_OUTPUT("Stack Data :");
 484                 for (i = 0; i < stacking->stack_registers_size; i++)
 485                         LOG_OUTPUT("%02X", stack_data[i]);
 486                 LOG_OUTPUT("\r\n");
 487 #endif
 488         for (i = 0; i < stacking->num_output_registers; i++)
 489                 list_size += stacking->register_offsets[i].width_bits/8;
 490         *hex_reg_list = malloc(list_size*2 + 1);
 491         tmp_str_ptr = *hex_reg_list;
 492         if (stacking->calculate_process_stack != NULL) {
 493                 new_stack_ptr = stacking->calculate_process_stack(target,
 494                                 stack_data, stacking, stack_ptr);
 495         } else {
 496                 new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 497                         stacking->stack_registers_size;
 498         }
 499         for (i = 0; i < stacking->num_output_registers; i++) {
 500                 int j;
 501                 for (j = 0; j < stacking->register_offsets[i].width_bits/8; j++) {
 502                         if (stacking->register_offsets[i].offset == -1)
 503                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x", 0);
 504                         else if (stacking->register_offsets[i].offset == -2)
 505                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x",
 506                                                 ((uint8_t *)&new_stack_ptr)[j]);
 507                         else
 508                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x",
 509                                                 stack_data[stacking->register_offsets[i].offset + j]);
 510                 }
 511         }
 512         free(stack_data);
 513 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 514         return ERROR_OK;
 515 }
 516
 517 int rtos_try_next(struct target *target)
 518 {
 519         struct rtos *os = target->rtos;
 520         struct rtos_type **type = rtos_types;
 521
 522         if (!os)
 523                 return 0;
 524
 525         while (*type && os->type != *type)
 526                 type++;
 527
 528         if (!*type || !*(++type))
 529                 return 0;
 530
 531         os->type = *type;
 532         if (os->symbols) {
 533                 free(os->symbols);
 534                 os->symbols = NULL;
 535         }
 536
 537         return 1;
 538 }
 539
 540 int rtos_update_threads(struct target *target)
 541 {
 542         if ((target->rtos != NULL) && (target->rtos->type != NULL))
 543                 target->rtos->type->update_threads(target->rtos);
 544         return ERROR_OK;
 545 }
 546
 547 void rtos_free_threadlist(struct rtos *rtos)
 548 {
 549         if (rtos->thread_details) {
 550                 int j;
 551
 552                 for (j = 0; j < rtos->thread_count; j++) {
 553                         struct thread_detail *current_thread = &rtos->thread_details[j];
 554                         free(current_thread->thread_name_str);
 555                         free(current_thread->extra_info_str);
 556                 }
 557                 free(rtos->thread_details);
 558                 rtos->thread_details = NULL;
 559                 rtos->thread_count = 0;
 560                 rtos->current_threadid = -1;
 561                 rtos->current_thread = 0;
 562         }
 563 }