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   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Broadcom Corporation                            *
   3  *   Evan Hunter - ehunter@broadcom.com                                    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  19  ***************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "rtos.h"
  26 #include "target/target.h"
  27 #include "helper/log.h"
  28 #include "helper/binarybuffer.h"
  29 #include "server/gdb_server.h"
  30
  31 /* RTOSs */
  32 extern struct rtos_type FreeRTOS_rtos;
  33 extern struct rtos_type ThreadX_rtos;
  34 extern struct rtos_type eCos_rtos;
  35 extern struct rtos_type Linux_os;
  36 extern struct rtos_type ChibiOS_rtos;
  37 extern struct rtos_type embKernel_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         NULL
  47 };
  48
  49 int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
  50
  51 int rtos_smp_init(struct target *target)
  52 {
  53         if (target->rtos->type->smp_init)
  54                 return target->rtos->type->smp_init(target);
  55         return ERROR_TARGET_INIT_FAILED;
  56 }
  57
  58 static int os_alloc(struct target *target, struct rtos_type *ostype)
  59 {
  60         struct rtos *os = target->rtos = calloc(1, sizeof(struct rtos));
  61
  62         if (!os)
  63                 return JIM_ERR;
  64
  65         os->type = ostype;
  66         os->current_threadid = -1;
  67         os->current_thread = 0;
  68         os->symbols = NULL;
  69         os->target = target;
  70
  71         /* RTOS drivers can override the packet handler in _create(). */
  72         os->gdb_thread_packet = rtos_thread_packet;
  73
  74         return JIM_OK;
  75 }
  76
  77 static void os_free(struct target *target)
  78 {
  79         if (!target->rtos)
  80                 return;
  81
  82         if (target->rtos->symbols)
  83                 free(target->rtos->symbols);
  84
  85         free(target->rtos);
  86         target->rtos = NULL;
  87 }
  88
  89 static int os_alloc_create(struct target *target, struct rtos_type *ostype)
  90 {
  91         int ret = os_alloc(target, ostype);
  92
  93         if (JIM_OK == ret) {
  94                 ret = target->rtos->type->create(target);
  95                 if (ret != JIM_OK)
  96                         os_free(target);
  97         }
  98
  99         return ret;
 100 }
 101
 102 int rtos_create(Jim_GetOptInfo *goi, struct target *target)
 103 {
 104         int x;
 105         char *cp;
 106         struct Jim_Obj *res;
 107
 108         if (!goi->isconfigure && goi->argc != 0) {
 109                 Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "NO PARAMS");
 110                 return JIM_ERR;
 111         }
 112
 113         os_free(target);
 114
 115         Jim_GetOpt_String(goi, &cp, NULL);
 116
 117         if (0 == strcmp(cp, "auto")) {
 118                 /* Auto detect tries to look up all symbols for each RTOS,
 119                  * and runs the RTOS driver's _detect() function when GDB
 120                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 121                 target->rtos_auto_detect = true;
 122
 123                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 124                  * target->rtos here, and set it to the first RTOS type. */
 125                 return os_alloc(target, rtos_types[0]);
 126         }
 127
 128         for (x = 0; rtos_types[x]; x++)
 129                 if (0 == strcmp(cp, rtos_types[x]->name))
 130                         return os_alloc_create(target, rtos_types[x]);
 131
 132         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 133         res = Jim_GetResult(goi->interp);
 134         for (x = 0; rtos_types[x]; x++)
 135                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 136         Jim_AppendStrings(goi->interp, res, " or auto", NULL);
 137
 138         return JIM_ERR;
 139 }
 140
 141 int gdb_thread_packet(struct connection *connection, char const *packet, int packet_size)
 142 {
 143         struct target *target = get_target_from_connection(connection);
 144         if (target->rtos == NULL)
 145                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 146                                                                                  *found*/
 147         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 148 }
 149
 150 static symbol_table_elem_t *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 151 {
 152         symbol_table_elem_t *s;
 153
 154         if (!os->symbols)
 155                 os->type->get_symbol_list_to_lookup(&os->symbols);
 156
 157         if (!cur_symbol[0])
 158                 return &os->symbols[0];
 159
 160         for (s = os->symbols; s->symbol_name; s++)
 161                 if (!strcmp(s->symbol_name, cur_symbol)) {
 162                         s->address = cur_addr;
 163                         s++;
 164                         return s;
 165                 }
 166
 167         return NULL;
 168 }
 169
 170 /* searches for 'symbol' in the lookup table for 'os' and returns TRUE,
 171  * if 'symbol' is not declared optional */
 172 static bool is_symbol_mandatory(const struct rtos *os, const char *symbol)
 173 {
 174         for (symbol_table_elem_t *s = os->symbols; s->symbol_name; ++s) {
 175                 if (!strcmp(s->symbol_name, symbol))
 176                         return !s->optional;
 177         }
 178         return false;
 179 }
 180
 181 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 182  *
 183  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 184  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 185  *
 186  * If the qSymbol packet has no address that means GDB did not find the
 187  * symbol, in which case auto-detect will move on to try the next RTOS.
 188  *
 189  * rtos_qsymbol() then calls the next_symbol() helper function, which
 190  * iterates over symbol names for the current RTOS until it finds the
 191  * symbol in the received GDB packet, and then returns the next entry
 192  * in the list of symbols.
 193  *
 194  * If GDB replied about the last symbol for the RTOS and the RTOS was
 195  * specified explicitly, then no further symbol lookup is done. When
 196  * auto-detecting, the RTOS driver _detect() function must return success.
 197  *
 198  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 199  */
 200 int rtos_qsymbol(struct connection *connection, char const *packet, int packet_size)
 201 {
 202         int rtos_detected = 0;
 203         uint64_t addr = 0;
 204         size_t reply_len;
 205         char reply[GDB_BUFFER_SIZE], cur_sym[GDB_BUFFER_SIZE / 2] = "";
 206         symbol_table_elem_t *next_sym = NULL;
 207         struct target *target = get_target_from_connection(connection);
 208         struct rtos *os = target->rtos;
 209
 210         reply_len = sprintf(reply, "OK");
 211
 212         if (!os)
 213                 goto done;
 214
 215         /* Decode any symbol name in the packet*/
 216         int len = unhexify(cur_sym, strchr(packet + 8, ':') + 1, strlen(strchr(packet + 8, ':') + 1));
 217         cur_sym[len] = 0;
 218
 219         if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
 220             (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr)) && /* GDB did not find an address for a symbol */
 221             is_symbol_mandatory(os, cur_sym)) {                                 /* the symbol is mandatory for this RTOS */
 222
 223                 /* GDB could not find an address for the previous symbol */
 224                 if (!target->rtos_auto_detect) {
 225                         LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
 226                         goto done;
 227                 } else {
 228                         /* Autodetecting RTOS - try next RTOS */
 229                         if (!rtos_try_next(target)) {
 230                                 LOG_WARNING("No RTOS could be auto-detected!");
 231                                 goto done;
 232                         }
 233
 234                         /* Next RTOS selected - invalidate current symbol */
 235                         cur_sym[0] = '\x00';
 236                 }
 237         }
 238         next_sym = next_symbol(os, cur_sym, addr);
 239
 240         if (!next_sym->symbol_name) {
 241                 /* No more symbols need looking up */
 242
 243                 if (!target->rtos_auto_detect) {
 244                         rtos_detected = 1;
 245                         goto done;
 246                 }
 247
 248                 if (os->type->detect_rtos(target)) {
 249                         LOG_INFO("Auto-detected RTOS: %s", os->type->name);
 250                         rtos_detected = 1;
 251                         goto done;
 252                 } else {
 253                         LOG_WARNING("No RTOS could be auto-detected!");
 254                         goto done;
 255                 }
 256         }
 257
 258         if (8 + (strlen(next_sym->symbol_name) * 2) + 1 > sizeof(reply)) {
 259                 LOG_ERROR("ERROR: RTOS symbol '%s' name is too long for GDB!", next_sym->symbol_name);
 260                 goto done;
 261         }
 262
 263         reply_len = snprintf(reply, sizeof(reply), "qSymbol:");
 264         reply_len += hexify(reply + reply_len, next_sym->symbol_name, 0, sizeof(reply) - reply_len);
 265
 266 done:
 267         gdb_put_packet(connection, reply, reply_len);
 268         return rtos_detected;
 269 }
 270
 271 int rtos_thread_packet(struct connection *connection, char const *packet, int packet_size)
 272 {
 273         struct target *target = get_target_from_connection(connection);
 274
 275         if (strncmp(packet, "qThreadExtraInfo,", 17) == 0) {
 276                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL) &&
 277                                 (target->rtos->thread_count != 0)) {
 278                         threadid_t threadid = 0;
 279                         int found = -1;
 280                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 281
 282                         if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 283                                 int thread_num;
 284                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 285                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 286                                                 if (target->rtos->thread_details[thread_num].exists)
 287                                                         found = thread_num;
 288                                         }
 289                                 }
 290                         }
 291                         if (found == -1) {
 292                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 293                                 return ERROR_OK;
 294                         }
 295
 296                         struct thread_detail *detail = &target->rtos->thread_details[found];
 297
 298                         int str_size = 0;
 299                         if (detail->display_str != NULL)
 300                                 str_size += strlen(detail->display_str);
 301                         if (detail->thread_name_str != NULL)
 302                                 str_size += strlen(detail->thread_name_str);
 303                         if (detail->extra_info_str != NULL)
 304                                 str_size += strlen(detail->extra_info_str);
 305
 306                         char *tmp_str = malloc(str_size + 7);
 307                         char *tmp_str_ptr = tmp_str;
 308
 309                         if (detail->display_str != NULL)
 310                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->display_str);
 311                         if (detail->thread_name_str != NULL) {
 312                                 if (tmp_str_ptr != tmp_str)
 313                                         tmp_str_ptr += sprintf(tmp_str_ptr, " : ");
 314                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->thread_name_str);
 315                         }
 316                         if (detail->extra_info_str != NULL) {
 317                                 if (tmp_str_ptr != tmp_str)
 318                                         tmp_str_ptr += sprintf(tmp_str_ptr, " : ");
 319                                 tmp_str_ptr +=
 320                                         sprintf(tmp_str_ptr, " : %s", detail->extra_info_str);
 321                         }
 322
 323                         assert(strlen(tmp_str) ==
 324                                 (size_t) (tmp_str_ptr - tmp_str));
 325
 326                         char *hex_str = malloc(strlen(tmp_str) * 2 + 1);
 327                         int pkt_len = hexify(hex_str, tmp_str, 0, strlen(tmp_str) * 2 + 1);
 328
 329                         gdb_put_packet(connection, hex_str, pkt_len);
 330                         free(hex_str);
 331                         free(tmp_str);
 332                         return ERROR_OK;
 333
 334                 }
 335                 gdb_put_packet(connection, "", 0);
 336                 return ERROR_OK;
 337         } else if (strncmp(packet, "qSymbol", 7) == 0) {
 338                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 339                         target->rtos_auto_detect = false;
 340                         target->rtos->type->create(target);
 341                         target->rtos->type->update_threads(target->rtos);
 342                 }
 343                 return ERROR_OK;
 344         } else if (strncmp(packet, "qfThreadInfo", 12) == 0) {
 345                 int i;
 346                 if (target->rtos != NULL) {
 347                         if (target->rtos->thread_count == 0) {
 348                                 gdb_put_packet(connection, "l", 1);
 349                         } else {
 350                                 /*thread id are 16 char +1 for ',' */
 351                                 char *out_str = malloc(17 * target->rtos->thread_count + 1);
 352                                 char *tmp_str = out_str;
 353                                 for (i = 0; i < target->rtos->thread_count; i++) {
 354                                         tmp_str += sprintf(tmp_str, "%c%016" PRIx64, i == 0 ? 'm' : ',',
 355                                                                                 target->rtos->thread_details[i].threadid);
 356                                 }
 357                                 gdb_put_packet(connection, out_str, strlen(out_str));
 358                                 free(out_str);
 359                         }
 360                 } else
 361                         gdb_put_packet(connection, "l", 1);
 362
 363                 return ERROR_OK;
 364         } else if (strncmp(packet, "qsThreadInfo", 12) == 0) {
 365                 gdb_put_packet(connection, "l", 1);
 366                 return ERROR_OK;
 367         } else if (strncmp(packet, "qAttached", 9) == 0) {
 368                 gdb_put_packet(connection, "1", 1);
 369                 return ERROR_OK;
 370         } else if (strncmp(packet, "qOffsets", 8) == 0) {
 371                 char offsets[] = "Text=0;Data=0;Bss=0";
 372                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 373                 return ERROR_OK;
 374         } else if (strncmp(packet, "qCRC:", 5) == 0) {
 375                 /* make sure we check this before "qC" packet below
 376                  * otherwise it gets incorrectly handled */
 377                 return GDB_THREAD_PACKET_NOT_CONSUMED;
 378         } else if (strncmp(packet, "qC", 2) == 0) {
 379                 if (target->rtos != NULL) {
 380                         char buffer[19];
 381                         int size;
 382                         size = snprintf(buffer, 19, "QC%016" PRIx64, target->rtos->current_thread);
 383                         gdb_put_packet(connection, buffer, size);
 384                 } else
 385                         gdb_put_packet(connection, "QC0", 3);
 386                 return ERROR_OK;
 387         } else if (packet[0] == 'T') {  /* Is thread alive? */
 388                 threadid_t threadid;
 389                 int found = -1;
 390                 sscanf(packet, "T%" SCNx64, &threadid);
 391                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 392                         int thread_num;
 393                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 394                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 395                                         if (target->rtos->thread_details[thread_num].exists)
 396                                                 found = thread_num;
 397                                 }
 398                         }
 399                 }
 400                 if (found != -1)
 401                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 402                 else
 403                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 404                 return ERROR_OK;
 405         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 406                                          * all other operations ) */
 407                 if ((packet[1] == 'g') && (target->rtos != NULL))
 408                         sscanf(packet, "Hg%16" SCNx64, &target->rtos->current_threadid);
 409                 gdb_put_packet(connection, "OK", 2);
 410                 return ERROR_OK;
 411         }
 412
 413         return GDB_THREAD_PACKET_NOT_CONSUMED;
 414 }
 415
 416 int rtos_get_gdb_reg_list(struct connection *connection)
 417 {
 418         struct target *target = get_target_from_connection(connection);
 419         int64_t current_threadid = target->rtos->current_threadid;
 420         if ((target->rtos != NULL) && (current_threadid != -1) &&
 421                         (current_threadid != 0) &&
 422                         ((current_threadid != target->rtos->current_thread) ||
 423                         (target->smp))) {       /* in smp several current thread are possible */
 424                 char *hex_reg_list;
 425                 target->rtos->type->get_thread_reg_list(target->rtos,
 426                         current_threadid,
 427                         &hex_reg_list);
 428
 429                 if (hex_reg_list != NULL) {
 430                         gdb_put_packet(connection, hex_reg_list, strlen(hex_reg_list));
 431                         free(hex_reg_list);
 432                         return ERROR_OK;
 433                 }
 434         }
 435         return ERROR_FAIL;
 436 }
 437
 438 int rtos_generic_stack_read(struct target *target,
 439         const struct rtos_register_stacking *stacking,
 440         int64_t stack_ptr,
 441         char **hex_reg_list)
 442 {
 443         int list_size = 0;
 444         char *tmp_str_ptr;
 445         int64_t new_stack_ptr;
 446         int i;
 447         int retval;
 448
 449         if (stack_ptr == 0) {
 450                 LOG_ERROR("Error: null stack pointer in thread");
 451                 return -5;
 452         }
 453         /* Read the stack */
 454         uint8_t *stack_data = malloc(stacking->stack_registers_size);
 455         uint32_t address = stack_ptr;
 456
 457         if (stacking->stack_growth_direction == 1)
 458                 address -= stacking->stack_registers_size;
 459         retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 460         if (retval != ERROR_OK) {
 461                 free(stack_data);
 462                 LOG_ERROR("Error reading stack frame from thread");
 463                 return retval;
 464         }
 465 #if 0
 466                 LOG_OUTPUT("Stack Data :");
 467                 for (i = 0; i < stacking->stack_registers_size; i++)
 468                         LOG_OUTPUT("%02X", stack_data[i]);
 469                 LOG_OUTPUT("\r\n");
 470 #endif
 471         for (i = 0; i < stacking->num_output_registers; i++)
 472                 list_size += stacking->register_offsets[i].width_bits/8;
 473         *hex_reg_list = malloc(list_size*2 + 1);
 474         tmp_str_ptr = *hex_reg_list;
 475         new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 476                 stacking->stack_registers_size;
 477         if (stacking->stack_alignment != 0) {
 478                 /* Align new stack pointer to x byte boundary */
 479                 new_stack_ptr =
 480                         (new_stack_ptr & (~((int64_t) stacking->stack_alignment - 1))) +
 481                         ((stacking->stack_growth_direction == -1) ? stacking->stack_alignment : 0);
 482         }
 483         for (i = 0; i < stacking->num_output_registers; i++) {
 484                 int j;
 485                 for (j = 0; j < stacking->register_offsets[i].width_bits/8; j++) {
 486                         if (stacking->register_offsets[i].offset == -1)
 487                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x", 0);
 488                         else if (stacking->register_offsets[i].offset == -2)
 489                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x",
 490                                                 ((uint8_t *)&new_stack_ptr)[j]);
 491                         else
 492                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x",
 493                                                 stack_data[stacking->register_offsets[i].offset + j]);
 494                 }
 495         }
 496         free(stack_data);
 497 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 498         return ERROR_OK;
 499 }
 500
 501 int rtos_try_next(struct target *target)
 502 {
 503         struct rtos *os = target->rtos;
 504         struct rtos_type **type = rtos_types;
 505
 506         if (!os)
 507                 return 0;
 508
 509         while (*type && os->type != *type)
 510                 type++;
 511
 512         if (!*type || !*(++type))
 513                 return 0;
 514
 515         os->type = *type;
 516         if (os->symbols) {
 517                 free(os->symbols);
 518                 os->symbols = NULL;
 519         }
 520
 521         return 1;
 522 }
 523
 524 int rtos_update_threads(struct target *target)
 525 {
 526         if ((target->rtos != NULL) && (target->rtos->type != NULL))
 527                 target->rtos->type->update_threads(target->rtos);
 528         return ERROR_OK;
 529 }
 530
 531 void rtos_free_threadlist(struct rtos *rtos)
 532 {
 533         if (rtos->thread_details) {
 534                 int j;
 535
 536                 for (j = 0; j < rtos->thread_count; j++) {
 537                         struct thread_detail *current_thread = &rtos->thread_details[j];
 538                         free(current_thread->display_str);
 539                         free(current_thread->thread_name_str);
 540                         free(current_thread->extra_info_str);
 541                 }
 542                 free(rtos->thread_details);
 543                 rtos->thread_details = NULL;
 544                 rtos->thread_count = 0;
 545         }
 546 }