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   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2015 by Daniel Krebs                                    *
   5  *   Daniel Krebs - github@daniel-krebs.net                                *
   6  ***************************************************************************/
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include "config.h"
  10 #endif
  11
  12 #include <helper/time_support.h>
  13 #include <jtag/jtag.h>
  14 #include "target/target.h"
  15 #include "target/target_type.h"
  16 #include "rtos.h"
  17 #include "helper/log.h"
  18 #include "helper/types.h"
  19 #include "target/armv7m.h"
  20 #include "rtos_riot_stackings.h"
  21
  22 static bool riot_detect_rtos(struct target *target);
  23 static int riot_create(struct target *target);
  24 static int riot_update_threads(struct rtos *rtos);
  25 static int riot_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
  26         struct rtos_reg **reg_list, int *num_regs);
  27 static int riot_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]);
  28
  29 struct riot_thread_state {
  30         int value;
  31         const char *desc;
  32 };
  33
  34 /* refer RIOT sched.h */
  35 static const struct riot_thread_state riot_thread_states[] = {
  36         { 0, "Stopped" },
  37         { 1, "Zombie" },
  38         { 2, "Sleeping" },
  39         { 3, "Blocked mutex" },
  40         { 4, "Blocked receive" },
  41         { 5, "Blocked send" },
  42         { 6, "Blocked reply" },
  43         { 7, "Blocked any flag" },
  44         { 8, "Blocked all flags" },
  45         { 9, "Blocked mbox" },
  46         { 10, "Blocked condition" },
  47         { 11, "Running" },
  48         { 12, "Pending" },
  49 };
  50 #define RIOT_NUM_STATES ARRAY_SIZE(riot_thread_states)
  51
  52 struct riot_params {
  53         const char *target_name;
  54         unsigned char thread_sp_offset;
  55         unsigned char thread_status_offset;
  56 };
  57
  58 static const struct riot_params riot_params_list[] = {
  59         {
  60                 "cortex_m",             /* target_name */
  61                 0x00,                                   /* thread_sp_offset */
  62                 0x04,                                   /* thread_status_offset */
  63         },
  64         {       /* STLink */
  65                 "hla_target",           /* target_name */
  66                 0x00,                   /* thread_sp_offset */
  67                 0x04,                   /* thread_status_offset */
  68         }
  69 };
  70 #define RIOT_NUM_PARAMS ARRAY_SIZE(riot_params_list)
  71
  72 /* Initialize in riot_create() depending on architecture */
  73 static const struct rtos_register_stacking *stacking_info;
  74
  75 enum riot_symbol_values {
  76         RIOT_THREADS_BASE = 0,
  77         RIOT_NUM_THREADS,
  78         RIOT_ACTIVE_PID,
  79         RIOT_MAX_THREADS,
  80         RIOT_NAME_OFFSET,
  81 };
  82
  83 struct riot_symbol {
  84         const char *const name;
  85         bool optional;
  86 };
  87
  88 /* refer RIOT core/sched.c */
  89 static struct riot_symbol const riot_symbol_list[] = {
  90         {"sched_threads", false},
  91         {"sched_num_threads", false},
  92         {"sched_active_pid", false},
  93         {"max_threads", false},
  94         {"_tcb_name_offset", true},
  95         {NULL, false}
  96 };
  97
  98 const struct rtos_type riot_rtos = {
  99         .name = "RIOT",
 100         .detect_rtos = riot_detect_rtos,
 101         .create = riot_create,
 102         .update_threads = riot_update_threads,
 103         .get_thread_reg_list = riot_get_thread_reg_list,
 104         .get_symbol_list_to_lookup = riot_get_symbol_list_to_lookup,
 105 };
 106
 107 static int riot_update_threads(struct rtos *rtos)
 108 {
 109         int retval;
 110         int tasks_found = 0;
 111         const struct riot_params *param;
 112
 113         if (!rtos)
 114                 return ERROR_FAIL;
 115
 116         if (!rtos->rtos_specific_params)
 117                 return ERROR_FAIL;
 118
 119         param = (const struct riot_params *)rtos->rtos_specific_params;
 120
 121         if (!rtos->symbols) {
 122                 LOG_ERROR("No symbols for RIOT");
 123                 return ERROR_FAIL;
 124         }
 125
 126         if (rtos->symbols[RIOT_THREADS_BASE].address == 0) {
 127                 LOG_ERROR("Can't find symbol `%s`",
 128                         riot_symbol_list[RIOT_THREADS_BASE].name);
 129                 return ERROR_FAIL;
 130         }
 131
 132         /* wipe out previous thread details if any */
 133         rtos_free_threadlist(rtos);
 134
 135         /* Reset values */
 136         rtos->current_thread = 0;
 137         rtos->thread_count = 0;
 138
 139         /* read the current thread id */
 140         int16_t active_pid = 0;
 141         retval = target_read_u16(rtos->target,
 142                         rtos->symbols[RIOT_ACTIVE_PID].address,
 143                         (uint16_t *)&active_pid);
 144         if (retval != ERROR_OK) {
 145                 LOG_ERROR("Can't read symbol `%s`",
 146                         riot_symbol_list[RIOT_ACTIVE_PID].name);
 147                 return retval;
 148         }
 149         rtos->current_thread = active_pid;
 150
 151         /* read the current thread count
 152          * It's `int` in RIOT, but this is Cortex M* only anyway */
 153         int32_t thread_count = 0;
 154         retval = target_read_u16(rtos->target,
 155                         rtos->symbols[RIOT_NUM_THREADS].address,
 156                         (uint16_t *)&thread_count);
 157         if (retval != ERROR_OK) {
 158                 LOG_ERROR("Can't read symbol `%s`",
 159                         riot_symbol_list[RIOT_NUM_THREADS].name);
 160                 return retval;
 161         }
 162
 163         /* read the maximum number of threads */
 164         uint8_t max_threads = 0;
 165         retval = target_read_u8(rtos->target,
 166                         rtos->symbols[RIOT_MAX_THREADS].address,
 167                         &max_threads);
 168         if (retval != ERROR_OK) {
 169                 LOG_ERROR("Can't read symbol `%s`",
 170                         riot_symbol_list[RIOT_MAX_THREADS].name);
 171                 return retval;
 172         }
 173         if (thread_count > max_threads) {
 174                 LOG_ERROR("Thread count is invalid");
 175                 return ERROR_FAIL;
 176         }
 177         rtos->thread_count = thread_count;
 178
 179         /* Base address of thread array */
 180         uint32_t threads_base = rtos->symbols[RIOT_THREADS_BASE].address;
 181
 182         /* Try to get the offset of tcb_t::name, if absent RIOT wasn't compiled
 183          * with DEVELHELP, so there are no thread names */
 184         uint8_t name_offset = 0;
 185         if (rtos->symbols[RIOT_NAME_OFFSET].address != 0) {
 186                 retval = target_read_u8(rtos->target,
 187                                 rtos->symbols[RIOT_NAME_OFFSET].address,
 188                                 &name_offset);
 189                 if (retval != ERROR_OK) {
 190                         LOG_ERROR("Can't read symbol `%s`",
 191                                 riot_symbol_list[RIOT_NAME_OFFSET].name);
 192                         return retval;
 193                 }
 194         }
 195
 196         /* Allocate memory for thread description */
 197         rtos->thread_details = calloc(thread_count, sizeof(struct thread_detail));
 198         if (!rtos->thread_details) {
 199                 LOG_ERROR("RIOT: out of memory");
 200                 return ERROR_FAIL;
 201         }
 202
 203         /* Buffer for thread names, maximum to display is 32 */
 204         char buffer[32];
 205
 206         for (unsigned int i = 0; i < max_threads; i++) {
 207                 if (tasks_found == rtos->thread_count)
 208                         break;
 209
 210                 /* get pointer to tcb_t */
 211                 uint32_t tcb_pointer = 0;
 212                 retval = target_read_u32(rtos->target,
 213                                 threads_base + (i * 4),
 214                                 &tcb_pointer);
 215                 if (retval != ERROR_OK) {
 216                         LOG_ERROR("Can't parse `%s`",
 217                                 riot_symbol_list[RIOT_THREADS_BASE].name);
 218                         goto error;
 219                 }
 220
 221                 if (tcb_pointer == 0) {
 222                         /* PID unused */
 223                         continue;
 224                 }
 225
 226                 /* Index is PID */
 227                 rtos->thread_details[tasks_found].threadid = i;
 228
 229                 /* read thread state */
 230                 uint8_t status = 0;
 231                 retval = target_read_u8(rtos->target,
 232                                 tcb_pointer + param->thread_status_offset,
 233                                 &status);
 234                 if (retval != ERROR_OK) {
 235                         LOG_ERROR("Can't parse `%s`",
 236                                 riot_symbol_list[RIOT_THREADS_BASE].name);
 237                         goto error;
 238                 }
 239
 240                 /* Search for state */
 241                 unsigned int k;
 242                 for (k = 0; k < RIOT_NUM_STATES; k++) {
 243                         if (riot_thread_states[k].value == status)
 244                                 break;
 245                 }
 246
 247                 /* Copy state string */
 248                 if (k >= RIOT_NUM_STATES) {
 249                         rtos->thread_details[tasks_found].extra_info_str =
 250                         strdup("unknown state");
 251                 } else {
 252                         rtos->thread_details[tasks_found].extra_info_str =
 253                         strdup(riot_thread_states[k].desc);
 254                 }
 255
 256                 if (!rtos->thread_details[tasks_found].extra_info_str) {
 257                         LOG_ERROR("RIOT: out of memory");
 258                         retval = ERROR_FAIL;
 259                         goto error;
 260                 }
 261
 262                 /* Thread names are only available if compiled with DEVELHELP */
 263                 if (name_offset != 0) {
 264                         uint32_t name_pointer = 0;
 265                         retval = target_read_u32(rtos->target,
 266                                         tcb_pointer + name_offset,
 267                                         &name_pointer);
 268                         if (retval != ERROR_OK) {
 269                                 LOG_ERROR("Can't parse `%s`",
 270                                         riot_symbol_list[RIOT_THREADS_BASE].name);
 271                                 goto error;
 272                         }
 273
 274                         /* read thread name */
 275                         retval = target_read_buffer(rtos->target,
 276                                         name_pointer,
 277                                         sizeof(buffer),
 278                                         (uint8_t *)&buffer);
 279                         if (retval != ERROR_OK) {
 280                                 LOG_ERROR("Can't parse `%s`",
 281                                         riot_symbol_list[RIOT_THREADS_BASE].name);
 282                                 goto error;
 283                         }
 284
 285                         /* Make sure the string in the buffer terminates */
 286                         if (buffer[sizeof(buffer) - 1] != 0)
 287                                 buffer[sizeof(buffer) - 1] = 0;
 288
 289                         /* Copy thread name */
 290                         rtos->thread_details[tasks_found].thread_name_str =
 291                         strdup(buffer);
 292
 293                 } else {
 294                         rtos->thread_details[tasks_found].thread_name_str =
 295                         strdup("Enable DEVELHELP to see task names");
 296                 }
 297
 298                 if (!rtos->thread_details[tasks_found].thread_name_str) {
 299                         LOG_ERROR("RIOT: out of memory");
 300                         retval = ERROR_FAIL;
 301                         goto error;
 302                 }
 303
 304                 rtos->thread_details[tasks_found].exists = true;
 305
 306                 tasks_found++;
 307         }
 308
 309         return ERROR_OK;
 310
 311 error:
 312         rtos_free_threadlist(rtos);
 313         return retval;
 314 }
 315
 316 static int riot_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
 317                 struct rtos_reg **reg_list, int *num_regs)
 318 {
 319         int retval;
 320         const struct riot_params *param;
 321
 322         if (!rtos)
 323                 return ERROR_FAIL;
 324
 325         if (thread_id == 0)
 326                 return ERROR_FAIL;
 327
 328         if (!rtos->rtos_specific_params)
 329                 return ERROR_FAIL;
 330
 331         param = (const struct riot_params *)rtos->rtos_specific_params;
 332
 333         /* find the thread with given thread id */
 334         uint32_t threads_base = rtos->symbols[RIOT_THREADS_BASE].address;
 335         uint32_t tcb_pointer = 0;
 336         retval = target_read_u32(rtos->target,
 337                         threads_base + (thread_id * 4),
 338                         &tcb_pointer);
 339         if (retval != ERROR_OK) {
 340                 LOG_ERROR("Can't parse `%s`", riot_symbol_list[RIOT_THREADS_BASE].name);
 341                 return retval;
 342         }
 343
 344         /* read stack pointer for that thread */
 345         uint32_t stackptr = 0;
 346         retval = target_read_u32(rtos->target,
 347                         tcb_pointer + param->thread_sp_offset,
 348                         &stackptr);
 349         if (retval != ERROR_OK) {
 350                 LOG_ERROR("Can't parse `%s`", riot_symbol_list[RIOT_THREADS_BASE].name);
 351                 return retval;
 352         }
 353
 354         return rtos_generic_stack_read(rtos->target,
 355                         stacking_info,
 356                         stackptr,
 357                         reg_list,
 358                         num_regs);
 359 }
 360
 361 static int riot_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[])
 362 {
 363         *symbol_list = calloc(ARRAY_SIZE(riot_symbol_list), sizeof(struct symbol_table_elem));
 364
 365         if (!*symbol_list) {
 366                 LOG_ERROR("RIOT: out of memory");
 367                 return ERROR_FAIL;
 368         }
 369
 370         for (unsigned int i = 0; i < ARRAY_SIZE(riot_symbol_list); i++) {
 371                 (*symbol_list)[i].symbol_name = riot_symbol_list[i].name;
 372                 (*symbol_list)[i].optional = riot_symbol_list[i].optional;
 373         }
 374
 375         return ERROR_OK;
 376 }
 377
 378 static bool riot_detect_rtos(struct target *target)
 379 {
 380         if ((target->rtos->symbols) &&
 381                 (target->rtos->symbols[RIOT_THREADS_BASE].address != 0)) {
 382                 /* looks like RIOT */
 383                 return true;
 384         }
 385         return false;
 386 }
 387
 388 static int riot_create(struct target *target)
 389 {
 390         unsigned int i = 0;
 391
 392         /* lookup if target is supported by RIOT */
 393         while ((i < RIOT_NUM_PARAMS) &&
 394                 (strcmp(riot_params_list[i].target_name, target->type->name) != 0)) {
 395                 i++;
 396         }
 397         if (i >= RIOT_NUM_PARAMS) {
 398                 LOG_ERROR("Could not find target in RIOT compatibility list");
 399                 return ERROR_FAIL;
 400         }
 401
 402         target->rtos->rtos_specific_params = (void *)&riot_params_list[i];
 403         target->rtos->current_thread = 0;
 404         target->rtos->thread_details = NULL;
 405
 406         /* Stacking is different depending on architecture */
 407         struct armv7m_common *armv7m_target = target_to_armv7m(target);
 408
 409         if (armv7m_target->arm.arch == ARM_ARCH_V6M)
 410                 stacking_info = &rtos_riot_cortex_m0_stacking;
 411         else if (is_armv7m(armv7m_target))
 412                 stacking_info = &rtos_riot_cortex_m34_stacking;
 413         else {
 414                 LOG_ERROR("No stacking info for architecture");
 415                 return ERROR_FAIL;
 416         }
 417         return ERROR_OK;
 418 }