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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  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, 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 "server/gdb_server.h"
  29
  30 static void hex_to_str(char *dst, char *hex_src);
  31
  32 /* RTOSs */
  33 extern struct rtos_type FreeRTOS_rtos;
  34 extern struct rtos_type ThreadX_rtos;
  35 extern struct rtos_type eCos_rtos;
  36 extern struct rtos_type Linux_os;
  37 extern struct rtos_type ChibiOS_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         NULL
  46 };
  47
  48 int rtos_thread_packet(struct connection *connection, char *packet, int packet_size);
  49
  50 int rtos_smp_init(struct target *target)
  51 {
  52         if (target->rtos->type->smp_init)
  53                 return target->rtos->type->smp_init(target);
  54         return ERROR_TARGET_INIT_FAILED;
  55 }
  56
  57 static int os_alloc(struct target *target, 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
  73         return JIM_OK;
  74 }
  75
  76 static void os_free(struct target *target)
  77 {
  78         if (!target->rtos)
  79                 return;
  80
  81         if (target->rtos->symbols)
  82                 free(target->rtos->symbols);
  83
  84         free(target->rtos);
  85         target->rtos = NULL;
  86 }
  87
  88 static int os_alloc_create(struct target *target, struct rtos_type *ostype)
  89 {
  90         int ret = os_alloc(target, ostype);
  91
  92         if (JIM_OK == ret) {
  93                 ret = target->rtos->type->create(target);
  94                 if (ret != JIM_OK)
  95                         os_free(target);
  96         }
  97
  98         return ret;
  99 }
 100
 101 int rtos_create(Jim_GetOptInfo *goi, struct target *target)
 102 {
 103         int x;
 104         char *cp;
 105         struct Jim_Obj *res;
 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         Jim_GetOpt_String(goi, &cp, NULL);
 115
 116         if (0 == strcmp(cp, "auto")) {
 117                 /* Auto detect tries to look up all symbols for each RTOS,
 118                  * and runs the RTOS driver's _detect() function when GDB
 119                  * finds all symbols for any RTOS. See rtos_qsymbol(). */
 120                 target->rtos_auto_detect = true;
 121
 122                 /* rtos_qsymbol() will iterate over all RTOSes. Allocate
 123                  * target->rtos here, and set it to the first RTOS type. */
 124                 return os_alloc(target, rtos_types[0]);
 125         }
 126
 127         for (x = 0; rtos_types[x]; x++)
 128                 if (0 == strcmp(cp, rtos_types[x]->name))
 129                         return os_alloc_create(target, rtos_types[x]);
 130
 131         Jim_SetResultFormatted(goi->interp, "Unknown RTOS type %s, try one of: ", cp);
 132         res = Jim_GetResult(goi->interp);
 133         for (x = 0; rtos_types[x]; x++)
 134                 Jim_AppendStrings(goi->interp, res, rtos_types[x]->name, ", ", NULL);
 135         Jim_AppendStrings(goi->interp, res, " or auto", NULL);
 136
 137         return JIM_ERR;
 138 }
 139
 140 int gdb_thread_packet(struct connection *connection, char *packet, int packet_size)
 141 {
 142         struct target *target = get_target_from_connection(connection);
 143         if (target->rtos == NULL)
 144                 return rtos_thread_packet(connection, packet, packet_size);     /* thread not
 145                                                                                  *found*/
 146         return target->rtos->gdb_thread_packet(connection, packet, packet_size);
 147 }
 148
 149 static char *next_symbol(struct rtos *os, char *cur_symbol, uint64_t cur_addr)
 150 {
 151         symbol_table_elem_t *s;
 152
 153         if (!os->symbols)
 154                 os->type->get_symbol_list_to_lookup(&os->symbols);
 155
 156         if (!cur_symbol[0])
 157                 return os->symbols[0].symbol_name;
 158
 159         for (s = os->symbols; s->symbol_name; s++)
 160                 if (!strcmp(s->symbol_name, cur_symbol)) {
 161                         s->address = cur_addr;
 162                         s++;
 163                         return s->symbol_name;
 164                 }
 165
 166         return NULL;
 167 }
 168
 169 /* rtos_qsymbol() processes and replies to all qSymbol packets from GDB.
 170  *
 171  * GDB sends a qSymbol:: packet (empty address, empty name) to notify
 172  * that it can now answer qSymbol::hexcodedname queries, to look up symbols.
 173  *
 174  * If the qSymbol packet has no address that means GDB did not find the
 175  * symbol, in which case auto-detect will move on to try the next RTOS.
 176  *
 177  * rtos_qsymbol() then calls the next_symbol() helper function, which
 178  * iterates over symbol names for the current RTOS until it finds the
 179  * symbol in the received GDB packet, and then returns the next entry
 180  * in the list of symbols.
 181  *
 182  * If GDB replied about the last symbol for the RTOS and the RTOS was
 183  * specified explicitly, then no further symbol lookup is done. When
 184  * auto-detecting, the RTOS driver _detect() function must return success.
 185  *
 186  * rtos_qsymbol() returns 1 if an RTOS has been detected, or 0 otherwise.
 187  */
 188 int rtos_qsymbol(struct connection *connection, char *packet, int packet_size)
 189 {
 190         int rtos_detected = 0;
 191         uint64_t addr;
 192         size_t reply_len;
 193         char reply[GDB_BUFFER_SIZE], cur_sym[GDB_BUFFER_SIZE / 2] = "", *next_sym;
 194         struct target *target = get_target_from_connection(connection);
 195         struct rtos *os = target->rtos;
 196
 197         reply_len = sprintf(reply, "OK");
 198
 199         if (!os)
 200                 goto done;
 201
 202         if (sscanf(packet, "qSymbol:%" SCNx64 ":", &addr))
 203                 hex_to_str(cur_sym, strchr(packet + 8, ':') + 1);
 204         else if (target->rtos_auto_detect && !rtos_try_next(target))
 205                 goto done;
 206
 207         next_sym = next_symbol(os, cur_sym, addr);
 208         if (!next_sym) {
 209                 if (!target->rtos_auto_detect) {
 210                         rtos_detected = 1;
 211                         goto done;
 212                 }
 213
 214                 if (os->type->detect_rtos(target)) {
 215                         LOG_OUTPUT("Auto-detected RTOS: %s\r\n", os->type->name);
 216                         rtos_detected = 1;
 217                         goto done;
 218                 }
 219
 220                 if (!rtos_try_next(target))
 221                         goto done;
 222
 223                 os->type->get_symbol_list_to_lookup(&os->symbols);
 224
 225                 next_sym = os->symbols[0].symbol_name;
 226                 if (!next_sym)
 227                         goto done;
 228         }
 229
 230         if (8 + (strlen(next_sym) * 2) + 1 > sizeof(reply)) {
 231                 LOG_OUTPUT("ERROR: RTOS symbol '%s' name is too long for GDB!", next_sym);
 232                 goto done;
 233         }
 234
 235         reply_len = sprintf(reply, "qSymbol:");
 236         reply_len += str_to_hex(reply + reply_len, next_sym);
 237
 238 done:
 239         gdb_put_packet(connection, reply, reply_len);
 240         return rtos_detected;
 241 }
 242
 243 int rtos_thread_packet(struct connection *connection, char *packet, int packet_size)
 244 {
 245         struct target *target = get_target_from_connection(connection);
 246
 247         if (strstr(packet, "qThreadExtraInfo,")) {
 248                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL) &&
 249                                 (target->rtos->thread_count != 0)) {
 250                         threadid_t threadid = 0;
 251                         int found = -1;
 252                         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
 253
 254                         if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 255                                 int thread_num;
 256                                 for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 257                                         if (target->rtos->thread_details[thread_num].threadid == threadid) {
 258                                                 if (target->rtos->thread_details[thread_num].exists)
 259                                                         found = thread_num;
 260                                         }
 261                                 }
 262                         }
 263                         if (found == -1) {
 264                                 gdb_put_packet(connection, "E01", 3);   /* thread not found */
 265                                 return ERROR_OK;
 266                         }
 267
 268                         struct thread_detail *detail = &target->rtos->thread_details[found];
 269
 270                         int str_size = 0;
 271                         if (detail->display_str != NULL)
 272                                 str_size += strlen(detail->display_str);
 273                         if (detail->thread_name_str != NULL)
 274                                 str_size += strlen(detail->thread_name_str);
 275                         if (detail->extra_info_str != NULL)
 276                                 str_size += strlen(detail->extra_info_str);
 277
 278                         char *tmp_str = (char *) malloc(str_size + 7);
 279                         char *tmp_str_ptr = tmp_str;
 280
 281                         if (detail->display_str != NULL)
 282                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->display_str);
 283                         if (detail->thread_name_str != NULL) {
 284                                 if (tmp_str_ptr != tmp_str)
 285                                         tmp_str_ptr += sprintf(tmp_str_ptr, " : ");
 286                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", detail->thread_name_str);
 287                         }
 288                         if (detail->extra_info_str != NULL) {
 289                                 if (tmp_str_ptr != tmp_str)
 290                                         tmp_str_ptr += sprintf(tmp_str_ptr, " : ");
 291                                 tmp_str_ptr +=
 292                                         sprintf(tmp_str_ptr, " : %s", detail->extra_info_str);
 293                         }
 294
 295                         assert(strlen(tmp_str) ==
 296                                 (size_t) (tmp_str_ptr - tmp_str));
 297
 298                         char *hex_str = (char *) malloc(strlen(tmp_str)*2 + 1);
 299                         str_to_hex(hex_str, tmp_str);
 300
 301                         gdb_put_packet(connection, hex_str, strlen(hex_str));
 302                         free(hex_str);
 303                         free(tmp_str);
 304                         return ERROR_OK;
 305
 306                 }
 307                 gdb_put_packet(connection, "", 0);
 308                 return ERROR_OK;
 309         } else if (strstr(packet, "qSymbol")) {
 310                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
 311                         target->rtos_auto_detect = false;
 312                         target->rtos->type->create(target);
 313                         target->rtos->type->update_threads(target->rtos);
 314                 }
 315                 return ERROR_OK;
 316         } else if (strstr(packet, "qfThreadInfo")) {
 317                 int i;
 318                 if ((target->rtos != NULL) && (target->rtos->thread_count != 0)) {
 319
 320                         char *out_str = (char *) malloc(17 * target->rtos->thread_count + 5);
 321                         char *tmp_str = out_str;
 322                         tmp_str += sprintf(tmp_str, "m");
 323                         for (i = 0; i < target->rtos->thread_count; i++) {
 324                                 if (i != 0)
 325                                         tmp_str += sprintf(tmp_str, ",");
 326                                 tmp_str += sprintf(tmp_str, "%016" PRIx64,
 327                                                 target->rtos->thread_details[i].threadid);
 328                         }
 329                         tmp_str[0] = 0;
 330                         gdb_put_packet(connection, out_str, strlen(out_str));
 331                 } else
 332                         gdb_put_packet(connection, "", 0);
 333
 334                 return ERROR_OK;
 335         } else if (strstr(packet, "qsThreadInfo")) {
 336                 gdb_put_packet(connection, "l", 1);
 337                 return ERROR_OK;
 338         } else if (strstr(packet, "qAttached")) {
 339                 gdb_put_packet(connection, "1", 1);
 340                 return ERROR_OK;
 341         } else if (strstr(packet, "qOffsets")) {
 342                 char offsets[] = "Text=0;Data=0;Bss=0";
 343                 gdb_put_packet(connection, offsets, sizeof(offsets)-1);
 344                 return ERROR_OK;
 345         } else if (strstr(packet, "qC")) {
 346                 if (target->rtos != NULL) {
 347                         char buffer[15];
 348                         int size;
 349                         size = snprintf(buffer, 15, "QC%08X", (int)target->rtos->current_thread);
 350                         gdb_put_packet(connection, buffer, size);
 351                 } else
 352                         gdb_put_packet(connection, "QC0", 3);
 353                 return ERROR_OK;
 354         } else if (packet[0] == 'T') {  /* Is thread alive? */
 355                 threadid_t threadid;
 356                 int found = -1;
 357                 sscanf(packet, "T%" SCNx64, &threadid);
 358                 if ((target->rtos != NULL) && (target->rtos->thread_details != NULL)) {
 359                         int thread_num;
 360                         for (thread_num = 0; thread_num < target->rtos->thread_count; thread_num++) {
 361                                 if (target->rtos->thread_details[thread_num].threadid == threadid) {
 362                                         if (target->rtos->thread_details[thread_num].exists)
 363                                                 found = thread_num;
 364                                 }
 365                         }
 366                 }
 367                 if (found != -1)
 368                         gdb_put_packet(connection, "OK", 2);    /* thread alive */
 369                 else
 370                         gdb_put_packet(connection, "E01", 3);   /* thread not found */
 371                 return ERROR_OK;
 372         } else if (packet[0] == 'H') {  /* Set current thread ( 'c' for step and continue, 'g' for
 373                                          * all other operations ) */
 374                 if ((packet[1] == 'g') && (target->rtos != NULL))
 375                         sscanf(packet, "Hg%16" SCNx64, &target->rtos->current_threadid);
 376                 gdb_put_packet(connection, "OK", 2);
 377                 return ERROR_OK;
 378         }
 379
 380         return GDB_THREAD_PACKET_NOT_CONSUMED;
 381 }
 382
 383 int rtos_get_gdb_reg_list(struct connection *connection)
 384 {
 385         struct target *target = get_target_from_connection(connection);
 386         int64_t current_threadid = target->rtos->current_threadid;
 387         if ((target->rtos != NULL) && (current_threadid != -1) &&
 388                         (current_threadid != 0) &&
 389                         ((current_threadid != target->rtos->current_thread) ||
 390                         (target->smp))) {       /* in smp several current thread are possible */
 391                 char *hex_reg_list;
 392                 target->rtos->type->get_thread_reg_list(target->rtos,
 393                         current_threadid,
 394                         &hex_reg_list);
 395
 396                 if (hex_reg_list != NULL) {
 397                         gdb_put_packet(connection, hex_reg_list, strlen(hex_reg_list));
 398                         free(hex_reg_list);
 399                         return ERROR_OK;
 400                 }
 401         }
 402         return ERROR_FAIL;
 403 }
 404
 405 int rtos_generic_stack_read(struct target *target,
 406         const struct rtos_register_stacking *stacking,
 407         int64_t stack_ptr,
 408         char **hex_reg_list)
 409 {
 410         int list_size = 0;
 411         char *tmp_str_ptr;
 412         int64_t new_stack_ptr;
 413         int i;
 414         int retval;
 415
 416         if (stack_ptr == 0) {
 417                 LOG_OUTPUT("Error: null stack pointer in thread\r\n");
 418                 return -5;
 419         }
 420         /* Read the stack */
 421         uint8_t *stack_data = (uint8_t *) malloc(stacking->stack_registers_size);
 422         uint32_t address = stack_ptr;
 423
 424         if (stacking->stack_growth_direction == 1)
 425                 address -= stacking->stack_registers_size;
 426         retval = target_read_buffer(target, address, stacking->stack_registers_size, stack_data);
 427         if (retval != ERROR_OK) {
 428                 LOG_OUTPUT("Error reading stack frame from FreeRTOS thread\r\n");
 429                 return retval;
 430         }
 431 #if 0
 432                 LOG_OUTPUT("Stack Data :");
 433                 for (i = 0; i < stacking->stack_registers_size; i++)
 434                         LOG_OUTPUT("%02X", stack_data[i]);
 435                 LOG_OUTPUT("\r\n");
 436 #endif
 437         for (i = 0; i < stacking->num_output_registers; i++)
 438                 list_size += stacking->register_offsets[i].width_bits/8;
 439         *hex_reg_list = (char *)malloc(list_size*2 + 1);
 440         tmp_str_ptr = *hex_reg_list;
 441         new_stack_ptr = stack_ptr - stacking->stack_growth_direction *
 442                 stacking->stack_registers_size;
 443         if (stacking->stack_alignment != 0) {
 444                 /* Align new stack pointer to x byte boundary */
 445                 new_stack_ptr =
 446                         (new_stack_ptr & (~((int64_t) stacking->stack_alignment - 1))) +
 447                         ((stacking->stack_growth_direction == -1) ? stacking->stack_alignment : 0);
 448         }
 449         for (i = 0; i < stacking->num_output_registers; i++) {
 450                 int j;
 451                 for (j = 0; j < stacking->register_offsets[i].width_bits/8; j++) {
 452                         if (stacking->register_offsets[i].offset == -1)
 453                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x", 0);
 454                         else if (stacking->register_offsets[i].offset == -2)
 455                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x",
 456                                                 ((uint8_t *)&new_stack_ptr)[j]);
 457                         else
 458                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%02x",
 459                                                 stack_data[stacking->register_offsets[i].offset + j]);
 460                 }
 461         }
 462 /*      LOG_OUTPUT("Output register string: %s\r\n", *hex_reg_list); */
 463         return ERROR_OK;
 464 }
 465
 466 int rtos_try_next(struct target *target)
 467 {
 468         struct rtos *os = target->rtos;
 469         struct rtos_type **type = rtos_types;
 470
 471         if (!os)
 472                 return 0;
 473
 474         while (*type && os->type != *type)
 475                 type++;
 476
 477         if (!*type || !*(++type))
 478                 return 0;
 479
 480         os->type = *type;
 481         if (os->symbols) {
 482                 free(os->symbols);
 483                 os->symbols = NULL;
 484         }
 485
 486         return 1;
 487 }
 488
 489 static void hex_to_str(char *dst, char *hex_src)
 490 {
 491         int src_pos = 0;
 492         int dst_pos = 0;
 493
 494         while (hex_src[src_pos] != '\x00') {
 495                 char hex_char = hex_src[src_pos];
 496                 char hex_digit_val =
 497                         (hex_char >=
 498                          'a') ? hex_char-'a'+
 499                         10 : (hex_char >= 'A') ? hex_char-'A'+10 : hex_char-'0';
 500                 if (0 == (src_pos & 0x01)) {
 501                         dst[dst_pos] = hex_digit_val;
 502                         dst[dst_pos+1] = 0;
 503                 } else {
 504                         ((unsigned char *)dst)[dst_pos] <<= 4;
 505                         ((unsigned char *)dst)[dst_pos] += hex_digit_val;
 506                         dst_pos++;
 507                 }
 508                 src_pos++;
 509         }
 510
 511 }
 512
 513 int str_to_hex(char *hex_dst, char *src)
 514 {
 515         char *posptr = hex_dst;
 516         unsigned i;
 517         for (i = 0; i < strlen(src); i++)
 518                 posptr += sprintf(posptr, "%02x", (unsigned char)src[i]);
 519         return posptr - hex_dst;
 520 }
 521
 522 int rtos_update_threads(struct target *target)
 523 {
 524         if ((target->rtos != NULL) && (target->rtos->type != NULL))
 525                 target->rtos->type->update_threads(target->rtos);
 526         return ERROR_OK;
 527 }