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   1 /***************************************************************************
   2  *   Copyright (C) 2011 by STEricsson                                      *
   3  *   Heythem Bouhaja heythem.bouhaja@stericsson.com   : creation           *
   4  *   Michel JAOUEN michel.jaouen@stericsson.com : adaptation to rtos       *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <helper/time_support.h>
  27 #include <jtag/jtag.h>
  28 #include "target/target.h"
  29 #include "target/target_type.h"
  30 #include "helper/log.h"
  31 #include "rtos.h"
  32 #include "helper/log.h"
  33 #include "rtos_standard_stackings.h"
  34 #include <target/register.h>
  35 #include "server/gdb_server.h"
  36
  37 #define LINUX_USER_KERNEL_BORDER 0xc0000000
  38 #include "linux_header.h"
  39 #define PHYS
  40 #define MAX_THREADS 200
  41 /*  specific task  */
  42 struct linux_os {
  43         char *name;
  44         uint32_t init_task_addr;
  45         int thread_count;
  46         int threadid_count;
  47         int preupdtate_threadid_count;
  48         int nr_cpus;
  49         int threads_lookup;
  50         int threads_needs_update;
  51         struct current_thread *current_threads;
  52         struct threads *thread_list;
  53         /*  virt2phys parameter */
  54         uint32_t phys_mask;
  55         uint32_t phys_base;
  56 };
  57
  58 struct current_thread {
  59         int64_t threadid;
  60         int32_t core_id;
  61 #ifdef PID_CHECK
  62         uint32_t pid;
  63 #endif
  64         uint32_t TS;
  65         struct current_thread *next;
  66 };
  67
  68 struct threads {
  69         char name[17];
  70         uint32_t base_addr;     /*  address to read magic */
  71         uint32_t state;         /*  magic value : filled only at creation */
  72         uint32_t pid;           /* linux pid : id for identifying a thread */
  73         uint32_t oncpu;         /* content cpu number in current thread */
  74         uint32_t asid;          /*  filled only at creation  */
  75         int64_t threadid;
  76         int status;             /* dead = 1 alive = 2 current = 3 alive and current */
  77         /*  value that should not change during the live of a thread ? */
  78         uint32_t thread_info_addr;      /*  contain latest thread_info_addr computed */
  79         /*  retrieve from thread_info */
  80         struct cpu_context *context;
  81         struct threads *next;
  82 };
  83
  84 struct cpu_context {
  85         uint32_t R4;
  86         uint32_t R5;
  87         uint32_t R6;
  88         uint32_t R7;
  89         uint32_t R8;
  90         uint32_t R9;
  91         uint32_t IP;
  92         uint32_t FP;
  93         uint32_t SP;
  94         uint32_t PC;
  95         uint32_t preempt_count;
  96 };
  97 struct cpu_context *cpu_context_read(struct target *target, uint32_t base_addr,
  98                                      uint32_t *info_addr);
  99 static int insert_into_threadlist(struct target *target, struct threads *t);
 100
 101 static int linux_os_create(struct target *target);
 102
 103 static int linux_os_dummy_update(struct rtos *rtos)
 104 {
 105         /*  update is done only when thread request come
 106          *  too many thread to do it on each stop */
 107         return 0;
 108 }
 109
 110 static int linux_compute_virt2phys(struct target *target, uint32_t address)
 111 {
 112         struct linux_os *linux_os = (struct linux_os *)
 113                 target->rtos->rtos_specific_params;
 114         uint32_t pa = 0;
 115         int retval = target->type->virt2phys(target, address, &pa);
 116         if (retval != ERROR_OK) {
 117                 LOG_ERROR("Cannot compute linux virt2phys translation");
 118                 /*  fixes default address  */
 119                 linux_os->phys_base = 0;
 120                 return ERROR_FAIL;
 121         }
 122
 123         linux_os->init_task_addr = address;
 124         address = address & linux_os->phys_mask;
 125         linux_os->phys_base = pa - address;
 126         return ERROR_OK;
 127 }
 128
 129 static int linux_read_memory(struct target *target,
 130         uint32_t address, uint32_t size, uint32_t count,
 131         uint8_t *buffer)
 132 {
 133 #ifdef PHYS
 134         struct linux_os *linux_os = (struct linux_os *)
 135                 target->rtos->rtos_specific_params;
 136         uint32_t pa = (address & linux_os->phys_mask) + linux_os->phys_base;
 137 #endif
 138         if (address < 0xc000000) {
 139                 LOG_ERROR("linux awareness : address in user space");
 140                 return ERROR_FAIL;
 141         }
 142 #ifdef PHYS
 143         target->type->read_phys_memory(target, pa, size, count, buffer);
 144 #endif
 145         target->type->read_memory(target, address, size, count, buffer);
 146         return ERROR_OK;
 147 }
 148
 149 static char *reg_converter(char *buffer, void *reg, int size)
 150 {
 151         int i;
 152
 153         for (i = 0; i < size; i++)
 154                 buffer += sprintf(buffer, "%02x", ((uint8_t *) reg)[i]);
 155
 156         return buffer;
 157 }
 158
 159 int fill_buffer(struct target *target, uint32_t addr, uint8_t *buffer)
 160 {
 161
 162         if ((addr & 0xfffffffc) != addr)
 163                 LOG_INFO("unaligned address %x!!", addr);
 164
 165         int retval = linux_read_memory(target, addr, 4, 1, buffer);
 166         return retval;
 167
 168 }
 169
 170 uint32_t get_buffer(struct target *target, const uint8_t *buffer)
 171 {
 172         uint32_t value = 0;
 173         const uint8_t *value_ptr = buffer;
 174         value = target_buffer_get_u32(target, value_ptr);
 175         return value;
 176 }
 177
 178 static int linux_os_thread_reg_list(struct rtos *rtos,
 179         int64_t thread_id, char **hex_reg_list)
 180 {
 181         struct target *target = rtos->target;
 182         struct linux_os *linux_os = (struct linux_os *)
 183                 target->rtos->rtos_specific_params;
 184         int i = 0;
 185         struct current_thread *tmp = linux_os->current_threads;
 186         struct current_thread *next;
 187         char *hex_string;
 188         int found = 0;
 189         int retval;
 190         /*  check if a current thread is requested  */
 191         next = tmp;
 192
 193         do {
 194                 if (next->threadid == thread_id)
 195                         found = 1;
 196                 else
 197                         next = next->next;
 198         } while ((found == 0) && (next != tmp) && (next != NULL));
 199
 200         if (found == 1) {
 201                 /*  search target to perfom the access  */
 202                 struct reg **reg_list;
 203                 int reg_list_size, reg_packet_size = 0;
 204                 struct target_list *head;
 205                 head = target->head;
 206                 found = 0;
 207                 do {
 208                         if (head->target->coreid == next->core_id) {
 209
 210                                 target = head->target;
 211                                 found = 1;
 212                         } else
 213                                 head = head->next;
 214
 215                 } while ((head != (struct target_list *)NULL) && (found == 0));
 216
 217                 if (found == 0) {
 218                         LOG_ERROR
 219                         (
 220                                 "current thread %" PRIx64 ": no target to perform access of core id %x",
 221                                 thread_id,
 222                                 next->core_id);
 223                         return ERROR_FAIL;
 224                 }
 225
 226                 /*LOG_INFO("thread %lx current on core %x",thread_id,
 227                  * target->coreid);*/
 228                 retval =
 229                         target_get_gdb_reg_list(target, &reg_list, &reg_list_size);
 230
 231                 if (retval != ERROR_OK)
 232                         return retval;
 233
 234                 for (i = 0; i < reg_list_size; i++)
 235                         reg_packet_size += reg_list[i]->size;
 236
 237                 *hex_reg_list = malloc(DIV_ROUND_UP(reg_packet_size, 8) * 2);
 238
 239                 hex_string = *hex_reg_list;
 240
 241                 for (i = 0; i < reg_list_size; i++) {
 242                         if (!reg_list[i]->valid)
 243                                 reg_list[i]->type->get(reg_list[i]);
 244
 245                         hex_string = reg_converter(hex_string,
 246                                         reg_list[i]->value,
 247                                         (reg_list[i]->size) / 8);
 248                 }
 249
 250                 free(reg_list);
 251
 252         } else {
 253                 struct threads *temp = linux_os->thread_list;
 254                 *hex_reg_list = (char *)calloc(1, 500 * sizeof(char));
 255                 hex_string = *hex_reg_list;
 256
 257                 for (i = 0; i < 16; i++)
 258                         hex_string += sprintf(hex_string, "%02x", 0);
 259
 260                 while ((temp != NULL) &&
 261                                 (temp->threadid != target->rtos->current_threadid))
 262                         temp = temp->next;
 263
 264                 if (temp != NULL) {
 265                         if (temp->context == NULL)
 266                                 temp->context = cpu_context_read(target,
 267                                                 temp->
 268                                                 base_addr,
 269                                                 &temp->
 270                                                 thread_info_addr);
 271
 272                         hex_string =
 273                                 reg_converter(hex_string, &temp->context->R4, 4);
 274                         hex_string =
 275                                 reg_converter(hex_string, &temp->context->R5, 4);
 276                         hex_string =
 277                                 reg_converter(hex_string, &temp->context->R6, 4);
 278                         hex_string =
 279                                 reg_converter(hex_string, &temp->context->R7, 4);
 280                         hex_string =
 281                                 reg_converter(hex_string, &temp->context->R8, 4);
 282                         hex_string =
 283                                 reg_converter(hex_string, &temp->context->R9, 4);
 284
 285                         for (i = 0; i < 4; i++) /*R10 = 0x0 */
 286                                 hex_string += sprintf(hex_string, "%02x", 0);
 287
 288                         hex_string =
 289                                 reg_converter(hex_string, &temp->context->FP, 4);
 290                         hex_string =
 291                                 reg_converter(hex_string, &temp->context->IP, 4);
 292                         hex_string =
 293                                 reg_converter(hex_string, &temp->context->SP, 4);
 294
 295                         for (i = 0; i < 4; i++)
 296                                 hex_string += sprintf(hex_string, "%02x", 0);
 297
 298                         hex_string =
 299                                 reg_converter(hex_string, &temp->context->PC, 4);
 300
 301                         for (i = 0; i < 100; i++)       /*100 */
 302                                 hex_string += sprintf(hex_string, "%02x", 0);
 303
 304                         uint32_t cpsr = 0x00000000;
 305                         reg_converter(hex_string, &cpsr, 4);
 306                 }
 307         }
 308         return ERROR_OK;
 309 }
 310
 311 static int linux_os_detect(struct target *target)
 312 {
 313         LOG_INFO("should no be called");
 314         return 0;
 315 }
 316
 317 static int linux_os_smp_init(struct target *target);
 318 static int linux_os_clean(struct target *target);
 319 #define INIT_TASK 0
 320 static char *linux_symbol_list[] = {
 321         "init_task",
 322         NULL
 323 };
 324
 325 static int linux_get_symbol_list_to_lookup(symbol_table_elem_t *symbol_list[])
 326 {
 327         unsigned int i;
 328         *symbol_list = (symbol_table_elem_t *)
 329                 malloc(sizeof(symbol_table_elem_t) / sizeof(char *));
 330
 331         for (i = 0; i < sizeof(linux_symbol_list) / sizeof(char *); i++)
 332                 (*symbol_list)[i].symbol_name = linux_symbol_list[i];
 333
 334         return 0;
 335 }
 336
 337 static char *linux_ps_command(struct target *target);
 338
 339 const struct rtos_type Linux_os = {
 340         .name = "linux",
 341         .detect_rtos = linux_os_detect,
 342         .create = linux_os_create,
 343         .smp_init = linux_os_smp_init,
 344         .update_threads = linux_os_dummy_update,
 345         .get_thread_reg_list = linux_os_thread_reg_list,
 346         .get_symbol_list_to_lookup = linux_get_symbol_list_to_lookup,
 347         .clean = linux_os_clean,
 348         .ps_command = linux_ps_command,
 349 };
 350
 351 static int linux_thread_packet(struct connection *connection, char *packet,
 352                 int packet_size);
 353 static void linux_identify_current_threads(struct target *target);
 354
 355 #ifdef PID_CHECK
 356 int fill_task_pid(struct target *target, struct threads *t)
 357 {
 358         uint32_t pid_addr = t->base_addr + PID;
 359         uint8_t buffer[4];
 360         int retval = fill_buffer(target, pid_addr, buffer);
 361
 362         if (retval == ERROR_OK) {
 363                 uint32_t val = get_buffer(target, buffer);
 364                 t->pid = val;
 365         } else
 366                 LOG_ERROR("fill_task_pid: unable to read memory");
 367
 368         return retval;
 369 }
 370 #endif
 371
 372 int fill_task(struct target *target, struct threads *t)
 373 {
 374         int retval;
 375         uint32_t pid_addr = t->base_addr + PID;
 376         uint32_t mem_addr = t->base_addr + MEM;
 377         uint32_t on_cpu = t->base_addr + ONCPU;
 378         uint8_t *buffer = calloc(1, 4);
 379         retval = fill_buffer(target, t->base_addr, buffer);
 380
 381         if (retval == ERROR_OK) {
 382                 uint32_t val = get_buffer(target, buffer);
 383                 t->state = val;
 384         } else
 385                 LOG_ERROR("fill_task: unable to read memory");
 386
 387         retval = fill_buffer(target, pid_addr, buffer);
 388
 389         if (retval == ERROR_OK) {
 390                 uint32_t val = get_buffer(target, buffer);
 391                 t->pid = val;
 392         } else
 393                 LOG_ERROR("fill task: unable to read memory");
 394
 395         retval = fill_buffer(target, on_cpu, buffer);
 396
 397         if (retval == ERROR_OK) {
 398                 uint32_t val = get_buffer(target, buffer);
 399                 t->oncpu = val;
 400         } else
 401                 LOG_ERROR("fill task: unable to read memory");
 402
 403         retval = fill_buffer(target, mem_addr, buffer);
 404
 405         if (retval == ERROR_OK) {
 406                 uint32_t val = get_buffer(target, buffer);
 407
 408                 if (val != 0) {
 409                         uint32_t asid_addr = val + MM_CTX;
 410                         retval = fill_buffer(target, asid_addr, buffer);
 411
 412                         if (retval == ERROR_OK) {
 413                                 val = get_buffer(target, buffer);
 414                                 t->asid = val;
 415                         } else
 416                                 LOG_ERROR
 417                                         ("fill task: unable to read memory -- ASID");
 418                 } else
 419                         t->asid = 0;
 420         } else
 421                 LOG_ERROR("fill task: unable to read memory");
 422
 423         free(buffer);
 424
 425         return retval;
 426 }
 427
 428 int get_name(struct target *target, struct threads *t)
 429 {
 430         int retval;
 431         uint32_t full_name[4];
 432         uint32_t comm = t->base_addr + COMM;
 433         int i;
 434
 435         for (i = 0; i < 17; i++)
 436                 t->name[i] = 0;
 437
 438         retval = linux_read_memory(target, comm, 4, 4, (uint8_t *) full_name);
 439
 440         if (retval != ERROR_OK) {
 441                 LOG_ERROR("get_name: unable to read memory\n");
 442                 return ERROR_FAIL;
 443         }
 444
 445         uint32_t raw_name = target_buffer_get_u32(target,
 446                         (const uint8_t *)
 447                         &full_name[0]);
 448         t->name[3] = raw_name >> 24;
 449         t->name[2] = raw_name >> 16;
 450         t->name[1] = raw_name >> 8;
 451         t->name[0] = raw_name;
 452         raw_name =
 453                 target_buffer_get_u32(target, (const uint8_t *)&full_name[1]);
 454         t->name[7] = raw_name >> 24;
 455         t->name[6] = raw_name >> 16;
 456         t->name[5] = raw_name >> 8;
 457         t->name[4] = raw_name;
 458         raw_name =
 459                 target_buffer_get_u32(target, (const uint8_t *)&full_name[2]);
 460         t->name[11] = raw_name >> 24;
 461         t->name[10] = raw_name >> 16;
 462         t->name[9] = raw_name >> 8;
 463         t->name[8] = raw_name;
 464         raw_name =
 465                 target_buffer_get_u32(target, (const uint8_t *)&full_name[3]);
 466         t->name[15] = raw_name >> 24;
 467         t->name[14] = raw_name >> 16;
 468         t->name[13] = raw_name >> 8;
 469         t->name[12] = raw_name;
 470         return ERROR_OK;
 471
 472 }
 473
 474 int get_current(struct target *target, int create)
 475 {
 476         struct target_list *head;
 477         head = target->head;
 478         uint8_t *buf;
 479         uint32_t val;
 480         uint32_t ti_addr;
 481         uint8_t *buffer = calloc(1, 4);
 482         struct linux_os *linux_os = (struct linux_os *)
 483                 target->rtos->rtos_specific_params;
 484         struct current_thread *ctt = linux_os->current_threads;
 485
 486         /*  invalid current threads content */
 487         while (ctt != NULL) {
 488                 ctt->threadid = -1;
 489                 ctt->TS = 0xdeadbeef;
 490                 ctt = ctt->next;
 491         }
 492
 493         while (head != (struct target_list *)NULL) {
 494                 struct reg **reg_list;
 495                 int reg_list_size;
 496                 int retval;
 497
 498                 if (target_get_gdb_reg_list(head->target, &reg_list,
 499                                 &reg_list_size) != ERROR_OK) {
 500                         free(buffer);
 501                         return ERROR_TARGET_FAILURE;
 502                 }
 503
 504                 if (!reg_list[13]->valid)
 505                         reg_list[13]->type->get(reg_list[13]);
 506
 507                 buf = reg_list[13]->value;
 508                 val = get_buffer(target, buf);
 509                 ti_addr = (val & 0xffffe000);
 510                 uint32_t TS_addr = ti_addr + 0xc;
 511                 retval = fill_buffer(target, TS_addr, buffer);
 512
 513                 if (retval == ERROR_OK) {
 514                         uint32_t TS = get_buffer(target, buffer);
 515                         uint32_t cpu, on_cpu = TS + ONCPU;
 516                         retval = fill_buffer(target, on_cpu, buffer);
 517
 518                         if (retval == ERROR_OK) {
 519                                 /*uint32_t cpu = get_buffer(target, buffer);*/
 520                                 struct current_thread *ct =
 521                                         linux_os->current_threads;
 522                                 cpu = head->target->coreid;
 523
 524                                 while ((ct != NULL) && (ct->core_id != (int32_t) cpu))
 525                                         ct = ct->next;
 526
 527                                 if ((ct != NULL) && (ct->TS == 0xdeadbeef))
 528                                         ct->TS = TS;
 529                                 else
 530                                         LOG_ERROR
 531                                                 ("error in linux current thread update");
 532
 533                                 if (create) {
 534                                         struct threads *t;
 535                                         t = calloc(1, sizeof(struct threads));
 536                                         t->base_addr = ct->TS;
 537                                         fill_task(target, t);
 538                                         get_name(target, t);
 539                                         t->oncpu = cpu;
 540                                         insert_into_threadlist(target, t);
 541                                         t->status = 3;
 542                                         t->thread_info_addr = 0xdeadbeef;
 543                                         ct->threadid = t->threadid;
 544                                         linux_os->thread_count++;
 545 #ifdef PID_CHECK
 546                                         ct->pid = t->pid;
 547 #endif
 548                                         /*LOG_INFO("Creation of current thread %s",t->name);*/
 549                                 }
 550                         }
 551                 }
 552
 553                 free(reg_list);
 554                 head = head->next;
 555         }
 556
 557         free(buffer);
 558
 559         return ERROR_OK;
 560 }
 561
 562 struct cpu_context *cpu_context_read(struct target *target, uint32_t base_addr,
 563         uint32_t *thread_info_addr_old)
 564 {
 565         struct cpu_context *context = calloc(1, sizeof(struct cpu_context));
 566         uint32_t preempt_count_addr = 0;
 567         uint32_t registers[10];
 568         uint8_t *buffer = calloc(1, 4);
 569         uint32_t stack = base_addr + QAT;
 570         uint32_t thread_info_addr = 0;
 571         uint32_t thread_info_addr_update = 0;
 572         int retval = ERROR_FAIL;
 573         context->R4 = 0xdeadbeef;
 574         context->R5 = 0xdeadbeef;
 575         context->R6 = 0xdeadbeef;
 576         context->R7 = 0xdeadbeef;
 577         context->R8 = 0xdeadbeef;
 578         context->R9 = 0xdeadbeef;
 579         context->IP = 0xdeadbeef;
 580         context->FP = 0xdeadbeef;
 581         context->SP = 0xdeadbeef;
 582         context->PC = 0xdeadbeef;
 583 retry:
 584
 585         if (*thread_info_addr_old == 0xdeadbeef) {
 586                 retval = fill_buffer(target, stack, buffer);
 587
 588                 if (retval == ERROR_OK)
 589                         thread_info_addr = get_buffer(target, buffer);
 590                 else
 591                         LOG_ERROR("cpu_context: unable to read memory");
 592
 593                 thread_info_addr_update = thread_info_addr;
 594         } else
 595                 thread_info_addr = *thread_info_addr_old;
 596
 597         preempt_count_addr = thread_info_addr + PREEMPT;
 598         retval = fill_buffer(target, preempt_count_addr, buffer);
 599
 600         if (retval == ERROR_OK)
 601                 context->preempt_count = get_buffer(target, buffer);
 602         else {
 603                 if (*thread_info_addr_old != 0xdeadbeef) {
 604                         LOG_ERROR
 605                                 ("cpu_context: cannot read at thread_info_addr");
 606
 607                         if (*thread_info_addr_old < LINUX_USER_KERNEL_BORDER)
 608                                 LOG_INFO
 609                                         ("cpu_context : thread_info_addr in userspace!!!");
 610
 611                         *thread_info_addr_old = 0xdeadbeef;
 612                         goto retry;
 613                 }
 614
 615                 LOG_ERROR("cpu_context: unable to read memory");
 616         }
 617
 618         thread_info_addr += CPU_CONT;
 619
 620         retval = linux_read_memory(target, thread_info_addr, 4, 10,
 621                         (uint8_t *) registers);
 622
 623         if (retval != ERROR_OK) {
 624                 free(buffer);
 625                 LOG_ERROR("cpu_context: unable to read memory\n");
 626                 return context;
 627         }
 628
 629         context->R4 =
 630                 target_buffer_get_u32(target, (const uint8_t *)&registers[0]);
 631         context->R5 =
 632                 target_buffer_get_u32(target, (const uint8_t *)&registers[1]);
 633         context->R6 =
 634                 target_buffer_get_u32(target, (const uint8_t *)&registers[2]);
 635         context->R7 =
 636                 target_buffer_get_u32(target, (const uint8_t *)&registers[3]);
 637         context->R8 =
 638                 target_buffer_get_u32(target, (const uint8_t *)&registers[4]);
 639         context->R9 =
 640                 target_buffer_get_u32(target, (const uint8_t *)&registers[5]);
 641         context->IP =
 642                 target_buffer_get_u32(target, (const uint8_t *)&registers[6]);
 643         context->FP =
 644                 target_buffer_get_u32(target, (const uint8_t *)&registers[7]);
 645         context->SP =
 646                 target_buffer_get_u32(target, (const uint8_t *)&registers[8]);
 647         context->PC =
 648                 target_buffer_get_u32(target, (const uint8_t *)&registers[9]);
 649
 650         if (*thread_info_addr_old == 0xdeadbeef)
 651                 *thread_info_addr_old = thread_info_addr_update;
 652
 653         free(buffer);
 654
 655         return context;
 656 }
 657
 658 uint32_t next_task(struct target *target, struct threads *t)
 659 {
 660         uint8_t *buffer = calloc(1, 4);
 661         uint32_t next_addr = t->base_addr + NEXT;
 662         int retval = fill_buffer(target, next_addr, buffer);
 663
 664         if (retval == ERROR_OK) {
 665                 uint32_t val = get_buffer(target, buffer);
 666                 val = val - NEXT;
 667                 free(buffer);
 668                 return val;
 669         } else
 670                 LOG_ERROR("next task: unable to read memory");
 671
 672         free(buffer);
 673
 674         return 0;
 675 }
 676
 677 struct current_thread *add_current_thread(struct current_thread *currents,
 678         struct current_thread *ct)
 679 {
 680         ct->next = NULL;
 681
 682         if (currents == NULL) {
 683                 currents = ct;
 684                 return currents;
 685         } else {
 686                 struct current_thread *temp = currents;
 687
 688                 while (temp->next != NULL)
 689                         temp = temp->next;
 690
 691                 temp->next = ct;
 692                 return currents;
 693         }
 694 }
 695
 696 struct threads *liste_del_task(struct threads *task_list, struct threads **t,
 697         struct threads *prev)
 698 {
 699         LOG_INFO("del task %" PRId64, (*t)->threadid);
 700         prev->next = (*t)->next;
 701
 702         if (prev == task_list)
 703                 task_list = prev;
 704
 705         /*  free content of threads */
 706         if ((*t)->context)
 707                 free((*t)->context);
 708
 709         free(*t);
 710         *t = prev;
 711         return task_list;
 712 }
 713
 714 struct threads *liste_add_task(struct threads *task_list, struct threads *t,
 715         struct threads **last)
 716 {
 717         t->next = NULL;
 718
 719         if (*last == NULL)
 720                 if (task_list == NULL) {
 721                         task_list = t;
 722                         return task_list;
 723                 } else {
 724                         struct threads *temp = task_list;
 725
 726                         while (temp->next != NULL)
 727                                 temp = temp->next;
 728
 729                         temp->next = t;
 730                         *last = t;
 731                         return task_list;
 732                 } else {
 733                 (*last)->next = t;
 734                 *last = t;
 735                 return task_list;
 736         }
 737 }
 738
 739 #ifdef PID_CHECK
 740 static int current_pid(struct linux_os *linux_os, uint32_t pid)
 741 #else
 742 static int current_base_addr(struct linux_os *linux_os, uint32_t base_addr)
 743 #endif
 744 {
 745         struct current_thread *ct = linux_os->current_threads;
 746 #ifdef PID_CHECK
 747
 748         while ((ct != NULL) && (ct->pid != pid))
 749 #else
 750         while ((ct != NULL) && (ct->TS != base_addr))
 751 #endif
 752                 ct = ct->next;
 753 #ifdef PID_CHECK
 754         if ((ct != NULL) && (ct->pid == pid))
 755 #else
 756         if ((ct != NULL) && (ct->TS == base_addr))
 757 #endif
 758                 return 1;
 759
 760         return 0;
 761 }
 762
 763 int linux_get_tasks(struct target *target, int context)
 764 {
 765         int loop = 0;
 766         int retval = 0;
 767         struct linux_os *linux_os = (struct linux_os *)
 768                 target->rtos->rtos_specific_params;
 769         linux_os->thread_list = NULL;
 770         linux_os->thread_count = 0;
 771
 772         if (linux_os->init_task_addr == 0xdeadbeef) {
 773                 LOG_INFO("no init symbol\n");
 774                 return ERROR_FAIL;
 775         }
 776
 777         int64_t start = timeval_ms();
 778
 779         struct threads *t = calloc(1, sizeof(struct threads));
 780         struct threads *last = NULL;
 781         t->base_addr = linux_os->init_task_addr;
 782         /* retrieve the thread id , currently running in the different smp core */
 783         get_current(target, 1);
 784
 785         while (((t->base_addr != linux_os->init_task_addr) &&
 786                 (t->base_addr != 0)) || (loop == 0)) {
 787                 loop++;
 788                 fill_task(target, t);
 789                 retval = get_name(target, t);
 790
 791                 if (loop > MAX_THREADS) {
 792                         free(t);
 793                         LOG_INFO("more than %d threads !!", MAX_THREADS);
 794                         return ERROR_FAIL;
 795                 }
 796
 797                 if (retval != ERROR_OK) {
 798                         free(t);
 799                         return ERROR_FAIL;
 800                 }
 801
 802                 /*  check that this thread is not one the current threads already
 803                  *  created */
 804 #ifdef PID_CHECK
 805
 806                 if (!current_pid(linux_os, t->pid)) {
 807 #else
 808                 if (!current_base_addr(linux_os, t->base_addr)) {
 809 #endif
 810                         t->threadid = linux_os->threadid_count;
 811                         t->status = 1;
 812                         linux_os->threadid_count++;
 813
 814                         linux_os->thread_list =
 815                                 liste_add_task(linux_os->thread_list, t, &last);
 816                         /* no interest to fill the context if it is a current thread. */
 817                         linux_os->thread_count++;
 818                         t->thread_info_addr = 0xdeadbeef;
 819
 820                         if (context)
 821                                 t->context =
 822                                         cpu_context_read(target, t->base_addr,
 823                                                 &t->thread_info_addr);
 824                 } else {
 825                         /*LOG_INFO("thread %s is a current thread already created",t->name); */
 826                         free(t);
 827                 }
 828
 829                 uint32_t base_addr = next_task(target, t);
 830                 t = calloc(1, sizeof(struct threads));
 831                 t->base_addr = base_addr;
 832         }
 833
 834         linux_os->threads_lookup = 1;
 835         linux_os->threads_needs_update = 0;
 836         linux_os->preupdtate_threadid_count = linux_os->threadid_count - 1;
 837         /*  check that all current threads have been identified  */
 838
 839         LOG_INFO("complete time %" PRId64 ", thread mean %" PRId64 "\n",
 840                 (timeval_ms() - start),
 841                 (timeval_ms() - start) / linux_os->threadid_count);
 842
 843         LOG_INFO("threadid count %d", linux_os->threadid_count);
 844         free(t);
 845
 846         return ERROR_OK;
 847 }
 848
 849 static int clean_threadlist(struct target *target)
 850 {
 851         struct linux_os *linux_os = (struct linux_os *)
 852                 target->rtos->rtos_specific_params;
 853         struct threads *old, *temp = linux_os->thread_list;
 854
 855         while (temp != NULL) {
 856                 old = temp;
 857
 858                 if (temp->context)
 859                         free(temp->context);
 860
 861                 temp = temp->next;
 862                 free(old);
 863         }
 864
 865         return ERROR_OK;
 866 }
 867
 868 static int linux_os_clean(struct target *target)
 869 {
 870         struct linux_os *os_linux = (struct linux_os *)
 871                 target->rtos->rtos_specific_params;
 872         clean_threadlist(target);
 873         os_linux->init_task_addr = 0xdeadbeef;
 874         os_linux->name = "linux";
 875         os_linux->thread_list = NULL;
 876         os_linux->thread_count = 0;
 877         os_linux->nr_cpus = 0;
 878         os_linux->threads_lookup = 0;
 879         os_linux->threads_needs_update = 0;
 880         os_linux->threadid_count = 1;
 881         return ERROR_OK;
 882 }
 883
 884 static int insert_into_threadlist(struct target *target, struct threads *t)
 885 {
 886         struct linux_os *linux_os = (struct linux_os *)
 887                 target->rtos->rtos_specific_params;
 888         struct threads *temp = linux_os->thread_list;
 889         t->threadid = linux_os->threadid_count;
 890         linux_os->threadid_count++;
 891         t->status = 1;
 892         t->next = NULL;
 893
 894         if (temp == NULL)
 895                 linux_os->thread_list = t;
 896         else {
 897                 while (temp->next != NULL)
 898                         temp = temp->next;
 899
 900                 t->next = NULL;
 901                 temp->next = t;
 902         }
 903
 904         return ERROR_OK;
 905 }
 906
 907 static void linux_identify_current_threads(struct target *target)
 908 {
 909         struct linux_os *linux_os = (struct linux_os *)
 910                 target->rtos->rtos_specific_params;
 911         struct threads *thread_list = linux_os->thread_list;
 912         struct current_thread *ct = linux_os->current_threads;
 913         struct threads *t = NULL;
 914
 915         while ((ct != NULL)) {
 916                 if (ct->threadid == -1) {
 917
 918                         /*  un-identified thread */
 919                         int found = 0;
 920                         t = calloc(1, sizeof(struct threads));
 921                         t->base_addr = ct->TS;
 922 #ifdef PID_CHECK
 923
 924                         if (fill_task_pid(target, t) != ERROR_OK) {
 925 error_handling:
 926                                 free(t);
 927                                 LOG_ERROR
 928                                         ("linux identify_current_threads: unable to read pid");
 929                                 return;
 930                         }
 931 #endif
 932
 933                         /* search in the list of threads if pid
 934                            already present */
 935                         while ((thread_list != NULL) && (found == 0)) {
 936 #ifdef PID_CHECK
 937                                 if (thread_list->pid == t->pid) {
 938 #else
 939                                 if (thread_list->base_addr == t->base_addr) {
 940 #endif
 941                                         free(t);
 942                                         t = thread_list;
 943                                         found = 1;
 944                                 }
 945                                 thread_list = thread_list->next;
 946                         }
 947
 948                         if (!found) {
 949                                 /*  it is a new thread */
 950                                 if (fill_task(target, t) != ERROR_OK)
 951                                         goto error_handling;
 952
 953                                 get_name(target, t);
 954                                 insert_into_threadlist(target, t);
 955                                 t->thread_info_addr = 0xdeadbeef;
 956                         }
 957
 958                         t->status = 3;
 959                         ct->threadid = t->threadid;
 960 #ifdef PID_CHECK
 961                         ct->pid = t->pid;
 962 #endif
 963                         linux_os->thread_count++;
 964 #if 0
 965                         if (found == 0)
 966                                 LOG_INFO("current thread core %x identified %s",
 967                                         ct->core_id, t->name);
 968                         else
 969                                 LOG_INFO("current thread core %x, reused %s",
 970                                         ct->core_id, t->name);
 971 #endif
 972                 }
 973 #if 0
 974                 else {
 975                         struct threads tmp;
 976                         tmp.base_addr = ct->TS;
 977                         get_name(target, &tmp);
 978                         LOG_INFO("current thread core %x , already identified %s !!!",
 979                                 ct->core_id, tmp.name);
 980                 }
 981 #endif
 982                 ct = ct->next;
 983         }
 984
 985         return;
 986 #ifndef PID_CHECK
 987 error_handling:
 988         free(t);
 989         LOG_ERROR("unable to read pid");
 990         return;
 991
 992 #endif
 993 }
 994
 995 static int linux_task_update(struct target *target, int context)
 996 {
 997         struct linux_os *linux_os = (struct linux_os *)
 998                 target->rtos->rtos_specific_params;
 999         struct threads *thread_list = linux_os->thread_list;
1000         int retval;
1001         int loop = 0;
1002         linux_os->thread_count = 0;
1003
1004         /*thread_list = thread_list->next; skip init_task*/
1005         while (thread_list != NULL) {
1006                 thread_list->status = 0;        /*setting all tasks to dead state*/
1007
1008                 if (thread_list->context) {
1009                         free(thread_list->context);
1010                         thread_list->context = NULL;
1011                 }
1012
1013                 thread_list = thread_list->next;
1014         }
1015
1016         int found = 0;
1017
1018         if (linux_os->init_task_addr == 0xdeadbeef) {
1019                 LOG_INFO("no init symbol\n");
1020                 return ERROR_FAIL;
1021         }
1022         int64_t start = timeval_ms();
1023         struct threads *t = calloc(1, sizeof(struct threads));
1024         uint32_t previous = 0xdeadbeef;
1025         t->base_addr = linux_os->init_task_addr;
1026         retval = get_current(target, 0);
1027         /*check that all current threads have been identified  */
1028         linux_identify_current_threads(target);
1029
1030         while (((t->base_addr != linux_os->init_task_addr) &&
1031                 (t->base_addr != previous)) || (loop == 0)) {
1032                 /*  for avoiding any permanent loop for any reason possibly due to
1033                  *  target */
1034                 loop++;
1035                 previous = t->base_addr;
1036                 /*  read only pid */
1037 #ifdef PID_CHECK
1038                 retval = fill_task_pid(target, t);
1039 #endif
1040
1041                 if (retval != ERROR_OK) {
1042                         free(t);
1043                         return ERROR_FAIL;
1044                 }
1045
1046                 thread_list = linux_os->thread_list;
1047
1048                 while (thread_list != NULL) {
1049 #ifdef PID_CHECK
1050                         if (t->pid == thread_list->pid) {
1051 #else
1052                         if (t->base_addr == thread_list->base_addr) {
1053 #endif
1054                                 if (!thread_list->status) {
1055 #ifdef PID_CHECK
1056                                         if (t->base_addr != thread_list->base_addr)
1057                                                 LOG_INFO("thread base_addr has changed !!");
1058 #endif
1059                                         /*  this is not a current thread  */
1060                                         thread_list->base_addr = t->base_addr;
1061                                         thread_list->status = 1;
1062
1063                                         /*  we don 't update this field any more */
1064
1065                                         /*thread_list->state = t->state;
1066                                         thread_list->oncpu = t->oncpu;
1067                                         thread_list->asid = t->asid;
1068                                         */
1069                                         if (context)
1070                                                 thread_list->context =
1071                                                         cpu_context_read(target,
1072                                                                 thread_list->
1073                                                                 base_addr,
1074                                                                 &thread_list->
1075                                                                 thread_info_addr);
1076                                 } else {
1077                                         /*  it is a current thread no need to read context */
1078                                 }
1079
1080                                 linux_os->thread_count++;
1081                                 found = 1;
1082                                 break;
1083                         } else {
1084                                 found = 0;
1085                                 thread_list = thread_list->next;
1086                         }
1087                 }
1088
1089                 if (found == 0) {
1090                         uint32_t base_addr;
1091                         fill_task(target, t);
1092                         get_name(target, t);
1093                         retval = insert_into_threadlist(target, t);
1094                         t->thread_info_addr = 0xdeadbeef;
1095
1096                         if (context)
1097                                 t->context =
1098                                         cpu_context_read(target, t->base_addr,
1099                                                 &t->thread_info_addr);
1100
1101                         base_addr = next_task(target, t);
1102                         t = calloc(1, sizeof(struct threads));
1103                         t->base_addr = base_addr;
1104                         linux_os->thread_count++;
1105                 } else
1106                         t->base_addr = next_task(target, t);
1107         }
1108
1109         LOG_INFO("update thread done %" PRId64 ", mean%" PRId64 "\n",
1110                 (timeval_ms() - start), (timeval_ms() - start) / loop);
1111         free(t);
1112         linux_os->threads_needs_update = 0;
1113         return ERROR_OK;
1114 }
1115
1116 int linux_gdb_thread_packet(struct target *target,
1117         struct connection *connection, char *packet,
1118         int packet_size)
1119 {
1120         int retval;
1121         struct linux_os *linux_os =
1122                 (struct linux_os *)target->rtos->rtos_specific_params;
1123
1124         if (linux_os->init_task_addr == 0xdeadbeef) {
1125                 /* it has not been initialized */
1126                 LOG_INFO("received thread request without init task address");
1127                 gdb_put_packet(connection, "l", 1);
1128                 return ERROR_OK;
1129         }
1130
1131         retval = linux_get_tasks(target, 1);
1132
1133         if (retval != ERROR_OK)
1134                 return ERROR_TARGET_FAILURE;
1135
1136         char *out_str = (char *)calloc(1, 350 * sizeof(int64_t));
1137         char *tmp_str = out_str;
1138         tmp_str += sprintf(tmp_str, "m");
1139         struct threads *temp = linux_os->thread_list;
1140         tmp_str += sprintf(tmp_str, "%016" PRIx64, temp->threadid);
1141         temp = temp->next;
1142
1143         while (temp != NULL) {
1144                 tmp_str += sprintf(tmp_str, ",");
1145                 tmp_str += sprintf(tmp_str, "%016" PRIx64, temp->threadid);
1146                 temp = temp->next;
1147         }
1148
1149         gdb_put_packet(connection, out_str, strlen(out_str));
1150         return ERROR_OK;
1151 }
1152
1153 int linux_gdb_thread_update(struct target *target,
1154         struct connection *connection, char *packet,
1155         int packet_size)
1156 {
1157         int found = 0;
1158         struct linux_os *linux_os = (struct linux_os *)
1159                 target->rtos->rtos_specific_params;
1160         struct threads *temp = linux_os->thread_list;
1161
1162         while (temp != NULL) {
1163                 if (temp->threadid == linux_os->preupdtate_threadid_count + 1) {
1164                         /*LOG_INFO("FOUND");*/
1165                         found = 1;
1166                         break;
1167                 } else
1168                         temp = temp->next;
1169         }
1170
1171         if (found == 1) {
1172                 /*LOG_INFO("INTO GDB THREAD UPDATE FOUNDING START TASK");*/
1173                 char *out_strr = (char *)calloc(1, 350 * sizeof(int64_t));
1174                 char *tmp_strr = out_strr;
1175                 tmp_strr += sprintf(tmp_strr, "m");
1176                 /*LOG_INFO("CHAR MALLOC & M DONE");*/
1177                 tmp_strr += sprintf(tmp_strr, "%016" PRIx64, temp->threadid);
1178
1179                 temp = temp->next;
1180
1181                 while (temp != NULL) {
1182                         /*LOG_INFO("INTO GDB THREAD UPDATE WHILE");*/
1183                         tmp_strr += sprintf(tmp_strr, ",");
1184                         tmp_strr +=
1185                                 sprintf(tmp_strr, "%016" PRIx64, temp->threadid);
1186                         temp = temp->next;
1187                 }
1188
1189                 /*tmp_str[0] = 0;*/
1190                 gdb_put_packet(connection, out_strr, strlen(out_strr));
1191                 linux_os->preupdtate_threadid_count =
1192                         linux_os->threadid_count - 1;
1193                 free(out_strr);
1194         } else
1195                 gdb_put_packet(connection, "l", 1);
1196
1197         return ERROR_OK;
1198 }
1199
1200 int linux_thread_extra_info(struct target *target,
1201         struct connection *connection, char *packet,
1202         int packet_size)
1203 {
1204         int64_t threadid = 0;
1205         struct linux_os *linux_os = (struct linux_os *)
1206                 target->rtos->rtos_specific_params;
1207         sscanf(packet, "qThreadExtraInfo,%" SCNx64, &threadid);
1208         /*LOG_INFO("lookup extra info for thread %" SCNx64, threadid);*/
1209         struct threads *temp = linux_os->thread_list;
1210
1211         while (temp != NULL) {
1212                 if (temp->threadid == threadid) {
1213                         char *pid = " PID: ";
1214                         char *pid_current = "*PID: ";
1215                         char *name = "NAME: ";
1216                         int str_size = strlen(pid) + strlen(name);
1217                         char *tmp_str = (char *)calloc(1, str_size + 50);
1218                         char *tmp_str_ptr = tmp_str;
1219
1220                         /*  discriminate cuurent task */
1221                         if (temp->status == 3)
1222                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s",
1223                                                 pid_current);
1224                         else
1225                                 tmp_str_ptr += sprintf(tmp_str_ptr, "%s", pid);
1226
1227                         tmp_str_ptr +=
1228                                 sprintf(tmp_str_ptr, "%d", (int)temp->pid);
1229                         tmp_str_ptr += sprintf(tmp_str_ptr, "%s", " | ");
1230                         sprintf(tmp_str_ptr, "%s", name);
1231                         sprintf(tmp_str_ptr, "%s", temp->name);
1232                         char *hex_str =
1233                                 (char *)calloc(1, strlen(tmp_str) * 2 + 1);
1234                         str_to_hex(hex_str, tmp_str);
1235                         gdb_put_packet(connection, hex_str, strlen(hex_str));
1236                         free(hex_str);
1237                         free(tmp_str);
1238                         return ERROR_OK;
1239                 }
1240
1241                 temp = temp->next;
1242         }
1243
1244         LOG_INFO("thread not found");
1245         return ERROR_OK;
1246 }
1247
1248 int linux_gdb_T_packet(struct connection *connection,
1249         struct target *target, char *packet, int packet_size)
1250 {
1251         int64_t threadid;
1252         struct linux_os *linux_os = (struct linux_os *)
1253                 target->rtos->rtos_specific_params;
1254         int retval = ERROR_OK;
1255         sscanf(packet, "T%" SCNx64, &threadid);
1256
1257         if (linux_os->threads_needs_update == 0) {
1258                 struct threads *temp = linux_os->thread_list;
1259                 struct threads *prev = linux_os->thread_list;
1260
1261                 while (temp != NULL) {
1262                         if (temp->threadid == threadid) {
1263                                 if (temp->status != 0) {
1264                                         gdb_put_packet(connection, "OK", 2);
1265                                         return ERROR_OK;
1266                                 } else {
1267                                         /* delete item in the list   */
1268                                         linux_os->thread_list =
1269                                                 liste_del_task(linux_os->
1270                                                         thread_list, &temp,
1271                                                         prev);
1272                                         linux_os->thread_count--;
1273                                         gdb_put_packet(connection, "E01", 3);
1274                                         return ERROR_OK;
1275                                 }
1276                         }
1277
1278                         /*  for deletion  */
1279                         prev = temp;
1280                         temp = temp->next;
1281                 }
1282
1283                 LOG_INFO("gdb requested status on non existing thread");
1284                 gdb_put_packet(connection, "E01", 3);
1285                 return ERROR_OK;
1286
1287         } else {
1288                 retval = linux_task_update(target, 1);
1289                 struct threads *temp = linux_os->thread_list;
1290
1291                 while (temp != NULL) {
1292                         if (temp->threadid == threadid) {
1293                                 if (temp->status == 1) {
1294                                         gdb_put_packet(connection, "OK", 2);
1295                                         return ERROR_OK;
1296                                 } else {
1297                                         gdb_put_packet(connection, "E01", 3);
1298                                         return ERROR_OK;
1299                                 }
1300                         }
1301
1302                         temp = temp->next;
1303                 }
1304         }
1305
1306         return retval;
1307 }
1308
1309 int linux_gdb_h_packet(struct connection *connection,
1310         struct target *target, char *packet, int packet_size)
1311 {
1312         struct linux_os *linux_os = (struct linux_os *)
1313                 target->rtos->rtos_specific_params;
1314         struct current_thread *ct = linux_os->current_threads;
1315
1316         /* select to display the current thread of the selected target */
1317         while ((ct != NULL) && (ct->core_id != target->coreid))
1318                 ct = ct->next;
1319
1320         int64_t current_gdb_thread_rq;
1321
1322         if (linux_os->threads_lookup == 1) {
1323                 if ((ct != NULL) && (ct->threadid == -1)) {
1324                         ct = linux_os->current_threads;
1325
1326                         while ((ct != NULL) && (ct->threadid == -1))
1327                                 ct = ct->next;
1328                 }
1329
1330                 if (ct == NULL) {
1331                         /*  no current thread can be identified
1332                          *  any way with smp  */
1333                         LOG_INFO("no current thread identified");
1334                         /* attempt to display the name of the 2 threads identified with
1335                          * get_current */
1336                         struct threads t;
1337                         ct = linux_os->current_threads;
1338
1339                         while ((ct != NULL) && (ct->threadid == -1)) {
1340                                 t.base_addr = ct->TS;
1341                                 get_name(target, &t);
1342                                 LOG_INFO("name of unidentified thread %s",
1343                                         t.name);
1344                                 ct = ct->next;
1345                         }
1346
1347                         gdb_put_packet(connection, "OK", 2);
1348                         return ERROR_OK;
1349                 }
1350
1351                 if (packet[1] == 'g') {
1352                         sscanf(packet, "Hg%16" SCNx64, &current_gdb_thread_rq);
1353
1354                         if (current_gdb_thread_rq == 0) {
1355                                 target->rtos->current_threadid = ct->threadid;
1356                                 gdb_put_packet(connection, "OK", 2);
1357                         } else {
1358                                 target->rtos->current_threadid =
1359                                         current_gdb_thread_rq;
1360                                 gdb_put_packet(connection, "OK", 2);
1361                         }
1362                 } else if (packet[1] == 'c') {
1363                         sscanf(packet, "Hc%16" SCNx64, &current_gdb_thread_rq);
1364
1365                         if ((current_gdb_thread_rq == 0) ||
1366                                         (current_gdb_thread_rq == ct->threadid)) {
1367                                 target->rtos->current_threadid = ct->threadid;
1368                                 gdb_put_packet(connection, "OK", 2);
1369                         } else
1370                                 gdb_put_packet(connection, "E01", 3);
1371                 }
1372         } else
1373                 gdb_put_packet(connection, "OK", 2);
1374
1375         return ERROR_OK;
1376 }
1377
1378 static int linux_thread_packet(struct connection *connection, char *packet,
1379         int packet_size)
1380 {
1381         int retval = ERROR_OK;
1382         struct current_thread *ct;
1383         struct target *target = get_target_from_connection(connection);
1384         struct linux_os *linux_os = (struct linux_os *)
1385                 target->rtos->rtos_specific_params;
1386
1387         switch (packet[0]) {
1388                 case 'T':               /* Is thread alive?*/
1389
1390                         linux_gdb_T_packet(connection, target, packet, packet_size);
1391                         break;
1392                 case 'H':               /* Set current thread */
1393                         /*  ( 'c' for step and continue, 'g' for all other operations )*/
1394                         /*LOG_INFO(" H packet received '%s'", packet);*/
1395                         linux_gdb_h_packet(connection, target, packet, packet_size);
1396                         break;
1397                 case 'q':
1398
1399                         if ((strstr(packet, "qSymbol"))) {
1400                                 if (rtos_qsymbol(connection, packet, packet_size) == 1) {
1401                                         gdb_put_packet(connection, "OK", 2);
1402
1403                                         linux_compute_virt2phys(target,
1404                                                         target->rtos->
1405                                                         symbols[INIT_TASK].
1406                                                         address);
1407                                 }
1408
1409                                 break;
1410                         } else if (strstr(packet, "qfThreadInfo")) {
1411                                 if (linux_os->thread_list == NULL) {
1412                                         retval = linux_gdb_thread_packet(target,
1413                                                         connection,
1414                                                         packet,
1415                                                         packet_size);
1416                                         break;
1417                                 } else {
1418                                         retval = linux_gdb_thread_update(target,
1419                                                         connection,
1420                                                         packet,
1421                                                         packet_size);
1422                                         break;
1423                                 }
1424                         } else if (strstr(packet, "qsThreadInfo")) {
1425                                 gdb_put_packet(connection, "l", 1);
1426                                 break;
1427                         } else if (strstr(packet, "qThreadExtraInfo,")) {
1428                                 linux_thread_extra_info(target, connection, packet,
1429                                                 packet_size);
1430                                 break;
1431                         } else {
1432                                 retval = GDB_THREAD_PACKET_NOT_CONSUMED;
1433                                 break;
1434                         }
1435
1436                 case 'Q':
1437                         /* previously response was : thread not found
1438                          * gdb_put_packet(connection, "E01", 3); */
1439                         retval = GDB_THREAD_PACKET_NOT_CONSUMED;
1440                         break;
1441                 case 'c':
1442                 case 's': {
1443                         if (linux_os->threads_lookup == 1) {
1444                                 ct = linux_os->current_threads;
1445
1446                                 while ((ct != NULL) && (ct->core_id) != target->coreid)
1447                                         ct = ct->next;
1448
1449                                 if ((ct != NULL) && (ct->threadid == -1)) {
1450                                         ct = linux_os->current_threads;
1451
1452                                         while ((ct != NULL) && (ct->threadid == -1))
1453                                                 ct = ct->next;
1454                                 }
1455
1456                                 if ((ct != NULL) && (ct->threadid !=
1457                                                  target->rtos->
1458                                                  current_threadid)
1459                                 && (target->rtos->current_threadid != -1))
1460                                         LOG_WARNING("WARNING! current GDB thread do not match" \
1461                                                         "current thread running." \
1462                                                         "Switch thread in GDB to threadid %d",
1463                                                         (int)ct->threadid);
1464
1465                                 LOG_INFO("threads_needs_update = 1");
1466                                 linux_os->threads_needs_update = 1;
1467                         }
1468                 }
1469
1470                 /* if a packet handler returned an error, exit input loop */
1471                 if (retval != ERROR_OK)
1472                         return retval;
1473         }
1474
1475         return retval;
1476 }
1477
1478 static int linux_os_smp_init(struct target *target)
1479 {
1480         struct target_list *head;
1481         /* keep only target->rtos */
1482         struct rtos *rtos = target->rtos;
1483         struct linux_os *os_linux =
1484                 (struct linux_os *)rtos->rtos_specific_params;
1485         struct current_thread *ct;
1486         head = target->head;
1487
1488         while (head != (struct target_list *)NULL) {
1489                 if (head->target->rtos != rtos) {
1490                         struct linux_os *smp_os_linux =
1491                                 (struct linux_os *)head->target->rtos->
1492                                 rtos_specific_params;
1493                         /*  remap smp target on rtos  */
1494                         free(head->target->rtos);
1495                         head->target->rtos = rtos;
1496                         /*  reuse allocated ct */
1497                         ct = smp_os_linux->current_threads;
1498                         ct->threadid = -1;
1499                         ct->TS = 0xdeadbeef;
1500                         ct->core_id = head->target->coreid;
1501                         os_linux->current_threads =
1502                                 add_current_thread(os_linux->current_threads, ct);
1503                         os_linux->nr_cpus++;
1504                         free(smp_os_linux);
1505                 }
1506
1507                 head = head->next;
1508         }
1509
1510         return ERROR_OK;
1511 }
1512
1513 static int linux_os_create(struct target *target)
1514 {
1515         struct linux_os *os_linux = calloc(1, sizeof(struct linux_os));
1516         struct current_thread *ct = calloc(1, sizeof(struct current_thread));
1517         LOG_INFO("linux os creation\n");
1518         os_linux->init_task_addr = 0xdeadbeef;
1519         os_linux->name = "linux";
1520         os_linux->thread_list = NULL;
1521         os_linux->thread_count = 0;
1522         target->rtos->current_threadid = -1;
1523         os_linux->nr_cpus = 1;
1524         os_linux->threads_lookup = 0;
1525         os_linux->threads_needs_update = 0;
1526         os_linux->threadid_count = 1;
1527         os_linux->current_threads = NULL;
1528         target->rtos->rtos_specific_params = (void *)os_linux;
1529         ct->core_id = target->coreid;
1530         ct->threadid = -1;
1531         ct->TS = 0xdeadbeef;
1532         os_linux->current_threads =
1533                 add_current_thread(os_linux->current_threads, ct);
1534         /*  overload rtos thread default handler */
1535         target->rtos->gdb_thread_packet = linux_thread_packet;
1536         /*  initialize a default virt 2 phys translation */
1537         os_linux->phys_mask = ~0xc0000000;
1538         os_linux->phys_base = 0x0;
1539         return JIM_OK;
1540 }
1541
1542 static char *linux_ps_command(struct target *target)
1543 {
1544         struct linux_os *linux_os = (struct linux_os *)
1545                 target->rtos->rtos_specific_params;
1546         int retval = ERROR_OK;
1547         char *display;
1548
1549         if (linux_os->threads_lookup == 0)
1550                 retval = linux_get_tasks(target, 1);
1551         else {
1552                 if (linux_os->threads_needs_update != 0)
1553                         retval = linux_task_update(target, 0);
1554         }
1555
1556         if (retval == ERROR_OK) {
1557                 struct threads *temp = linux_os->thread_list;
1558                 char *tmp;
1559                 LOG_INFO("allocation for %d threads line",
1560                         linux_os->thread_count);
1561                 display = calloc((linux_os->thread_count + 2) * 80, 1);
1562
1563                 if (!display)
1564                         goto error;
1565
1566                 tmp = display;
1567                 tmp += sprintf(tmp, "PID\t\tCPU\t\tASID\t\tNAME\n");
1568                 tmp += sprintf(tmp, "---\t\t---\t\t----\t\t----\n");
1569
1570                 while (temp != NULL) {
1571                         if (temp->status) {
1572                                 if (temp->context)
1573                                         tmp +=
1574                                                 sprintf(tmp,
1575                                                         "%d\t\t%d\t\t%x\t\t%s\n",
1576                                                         (int)temp->pid, temp->oncpu,
1577                                                         temp->asid, temp->name);
1578                                 else
1579                                         tmp +=
1580                                                 sprintf(tmp,
1581                                                         "%d\t\t%d\t\t%x\t\t%s\n",
1582                                                         (int)temp->pid, temp->oncpu,
1583                                                         temp->asid, temp->name);
1584                         }
1585
1586                         temp = temp->next;
1587                 }
1588
1589                 return display;
1590         }
1591
1592 error:
1593         display = calloc(40, 1);
1594         sprintf(display, "linux_ps_command failed\n");
1595         return display;
1596 }