src/rtos/hwthread.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #ifdef HAVE_CONFIG_H
   4 #include "config.h"
   5 #endif
   6
   7 #include <helper/time_support.h>
   8 #include <jtag/jtag.h>
   9 #include "target/target.h"
  10 #include "target/target_type.h"
  11 #include "target/register.h"
  12 #include <target/smp.h>
  13 #include "rtos.h"
  14 #include "helper/log.h"
  15 #include "helper/types.h"
  16 #include "server/gdb_server.h"
  17
  18 static bool hwthread_detect_rtos(struct target *target);
  19 static int hwthread_create(struct target *target);
  20 static int hwthread_update_threads(struct rtos *rtos);
  21 static int hwthread_get_thread_reg(struct rtos *rtos, int64_t thread_id,
  22                 uint32_t reg_num, struct rtos_reg *rtos_reg);
  23 static int hwthread_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
  24                 struct rtos_reg **reg_list, int *num_regs);
  25 static int hwthread_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]);
  26 static int hwthread_smp_init(struct target *target);
  27 static int hwthread_set_reg(struct rtos *rtos, uint32_t reg_num, uint8_t *reg_value);
  28 static int hwthread_read_buffer(struct rtos *rtos, target_addr_t address,
  29                 uint32_t size, uint8_t *buffer);
  30 static int hwthread_write_buffer(struct rtos *rtos, target_addr_t address,
  31                 uint32_t size, const uint8_t *buffer);
  32
  33 #define HW_THREAD_NAME_STR_SIZE (32)
  34
  35 extern int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
  36
  37 static inline threadid_t threadid_from_target(const struct target *target)
  38 {
  39         return target->coreid + 1;
  40 }
  41
  42 const struct rtos_type hwthread_rtos = {
  43         .name = "hwthread",
  44         .detect_rtos = hwthread_detect_rtos,
  45         .create = hwthread_create,
  46         .update_threads = hwthread_update_threads,
  47         .get_thread_reg_list = hwthread_get_thread_reg_list,
  48         .get_thread_reg = hwthread_get_thread_reg,
  49         .get_symbol_list_to_lookup = hwthread_get_symbol_list_to_lookup,
  50         .smp_init = hwthread_smp_init,
  51         .set_reg = hwthread_set_reg,
  52         .read_buffer = hwthread_read_buffer,
  53         .write_buffer = hwthread_write_buffer,
  54 };
  55
  56 struct hwthread_params {
  57         int dummy_param;
  58 };
  59
  60 static int hwthread_fill_thread(struct rtos *rtos, struct target *curr, int thread_num)
  61 {
  62         char tmp_str[HW_THREAD_NAME_STR_SIZE];
  63         threadid_t tid = threadid_from_target(curr);
  64
  65         memset(tmp_str, 0, HW_THREAD_NAME_STR_SIZE);
  66
  67         /* thread-id is the core-id of this core inside the SMP group plus 1 */
  68         rtos->thread_details[thread_num].threadid = tid;
  69         /* create the thread name */
  70         rtos->thread_details[thread_num].exists = true;
  71         rtos->thread_details[thread_num].thread_name_str = strdup(target_name(curr));
  72         snprintf(tmp_str, HW_THREAD_NAME_STR_SIZE-1, "state: %s", debug_reason_name(curr));
  73         rtos->thread_details[thread_num].extra_info_str = strdup(tmp_str);
  74
  75         return ERROR_OK;
  76 }
  77
  78 static int hwthread_update_threads(struct rtos *rtos)
  79 {
  80         int threads_found = 0;
  81         int thread_list_size = 0;
  82         struct target_list *head;
  83         struct target *target;
  84         int64_t current_thread = 0;
  85         enum target_debug_reason current_reason = DBG_REASON_UNDEFINED;
  86
  87         if (!rtos)
  88                 return -1;
  89
  90         target = rtos->target;
  91
  92         /* wipe out previous thread details if any */
  93         rtos_free_threadlist(rtos);
  94
  95         /* determine the number of "threads" */
  96         if (target->smp) {
  97                 foreach_smp_target(head, target->smp_targets) {
  98                         struct target *curr = head->target;
  99
 100                         if (!target_was_examined(curr))
 101                                 continue;
 102
 103                         ++thread_list_size;
 104                 }
 105         } else
 106                 thread_list_size = 1;
 107
 108         /* create space for new thread details */
 109         rtos->thread_details = malloc(sizeof(struct thread_detail) * thread_list_size);
 110
 111         if (target->smp) {
 112                 /* loop over all threads */
 113                 foreach_smp_target(head, target->smp_targets) {
 114                         struct target *curr = head->target;
 115
 116                         if (!target_was_examined(curr))
 117                                 continue;
 118
 119                         threadid_t tid = threadid_from_target(curr);
 120
 121                         hwthread_fill_thread(rtos, curr, threads_found);
 122
 123                         /* find an interesting thread to set as current */
 124                         switch (current_reason) {
 125                         case DBG_REASON_UNDEFINED:
 126                                 current_reason = curr->debug_reason;
 127                                 current_thread = tid;
 128                                 break;
 129                         case DBG_REASON_SINGLESTEP:
 130                                 /* single-step can only be overridden by itself */
 131                                 if (curr->debug_reason == DBG_REASON_SINGLESTEP) {
 132                                         if (tid == rtos->current_threadid)
 133                                                 current_thread = tid;
 134                                 }
 135                                 break;
 136                         case DBG_REASON_BREAKPOINT:
 137                                 /* single-step overrides breakpoint */
 138                                 if (curr->debug_reason == DBG_REASON_SINGLESTEP) {
 139                                         current_reason = curr->debug_reason;
 140                                         current_thread = tid;
 141                                 } else
 142                                 /* multiple breakpoints, prefer gdbs' threadid */
 143                                 if (curr->debug_reason == DBG_REASON_BREAKPOINT) {
 144                                         if (tid == rtos->current_threadid)
 145                                                 current_thread = tid;
 146                                 }
 147                                 break;
 148                         case DBG_REASON_WATCHPOINT:
 149                                 /* breakpoint and single-step override watchpoint */
 150                                 if (curr->debug_reason == DBG_REASON_SINGLESTEP ||
 151                                                 curr->debug_reason == DBG_REASON_BREAKPOINT) {
 152                                         current_reason = curr->debug_reason;
 153                                         current_thread = tid;
 154                                 }
 155                                 break;
 156                         case DBG_REASON_DBGRQ:
 157                                 /* all other reasons override debug-request */
 158                                 if (curr->debug_reason == DBG_REASON_SINGLESTEP ||
 159                                                 curr->debug_reason == DBG_REASON_WATCHPOINT ||
 160                                                 curr->debug_reason == DBG_REASON_BREAKPOINT) {
 161                                         current_reason = curr->debug_reason;
 162                                         current_thread = tid;
 163                                 } else
 164                                 if (curr->debug_reason == DBG_REASON_DBGRQ) {
 165                                         if (tid == rtos->current_threadid)
 166                                                 current_thread = tid;
 167                                 }
 168
 169                                 break;
 170
 171                         default:
 172                                 break;
 173                         }
 174
 175                         threads_found++;
 176                 }
 177         } else {
 178                 hwthread_fill_thread(rtos, target, threads_found);
 179                 current_thread = threadid_from_target(target);
 180                 threads_found++;
 181         }
 182
 183         rtos->thread_count = threads_found;
 184
 185         /* we found an interesting thread, set it as current */
 186         if (current_thread != 0)
 187                 rtos->current_thread = current_thread;
 188         else if (rtos->current_threadid != 0)
 189                 rtos->current_thread = rtos->current_threadid;
 190         else
 191                 rtos->current_thread = threadid_from_target(target);
 192
 193         LOG_DEBUG("%s current_thread=%i", __func__, (int)rtos->current_thread);
 194         return 0;
 195 }
 196
 197 static int hwthread_smp_init(struct target *target)
 198 {
 199         return hwthread_update_threads(target->rtos);
 200 }
 201
 202 static struct target *hwthread_find_thread(struct target *target, int64_t thread_id)
 203 {
 204         /* Find the thread with that thread_id */
 205         if (!target)
 206                 return NULL;
 207         if (target->smp) {
 208                 struct target_list *head;
 209                 foreach_smp_target(head, target->smp_targets) {
 210                         if (thread_id == threadid_from_target(head->target))
 211                                 return head->target;
 212                 }
 213         } else if (thread_id == threadid_from_target(target)) {
 214                 return target;
 215         }
 216         return NULL;
 217 }
 218
 219 static int hwthread_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
 220                 struct rtos_reg **rtos_reg_list, int *rtos_reg_list_size)
 221 {
 222         if (!rtos)
 223                 return ERROR_FAIL;
 224
 225         struct target *target = rtos->target;
 226
 227         struct target *curr = hwthread_find_thread(target, thread_id);
 228         if (!curr)
 229                 return ERROR_FAIL;
 230
 231         if (!target_was_examined(curr))
 232                 return ERROR_FAIL;
 233
 234         int reg_list_size;
 235         struct reg **reg_list;
 236         int retval = target_get_gdb_reg_list(curr, &reg_list, &reg_list_size,
 237                         REG_CLASS_GENERAL);
 238         if (retval != ERROR_OK)
 239                 return retval;
 240
 241         int j = 0;
 242         for (int i = 0; i < reg_list_size; i++) {
 243                 if (!reg_list[i] || reg_list[i]->exist == false || reg_list[i]->hidden)
 244                         continue;
 245                 j++;
 246         }
 247         *rtos_reg_list_size = j;
 248         *rtos_reg_list = calloc(*rtos_reg_list_size, sizeof(struct rtos_reg));
 249         if (!*rtos_reg_list) {
 250                 free(reg_list);
 251                 return ERROR_FAIL;
 252         }
 253
 254         j = 0;
 255         for (int i = 0; i < reg_list_size; i++) {
 256                 if (!reg_list[i] || reg_list[i]->exist == false || reg_list[i]->hidden)
 257                         continue;
 258                 (*rtos_reg_list)[j].number = (*reg_list)[i].number;
 259                 (*rtos_reg_list)[j].size = (*reg_list)[i].size;
 260                 memcpy((*rtos_reg_list)[j].value, (*reg_list)[i].value,
 261                                 ((*reg_list)[i].size + 7) / 8);
 262                 j++;
 263         }
 264         free(reg_list);
 265
 266         return ERROR_OK;
 267 }
 268
 269 static int hwthread_get_thread_reg(struct rtos *rtos, int64_t thread_id,
 270                 uint32_t reg_num, struct rtos_reg *rtos_reg)
 271 {
 272         if (!rtos)
 273                 return ERROR_FAIL;
 274
 275         struct target *target = rtos->target;
 276
 277         struct target *curr = hwthread_find_thread(target, thread_id);
 278         if (!curr) {
 279                 LOG_ERROR("Couldn't find RTOS thread for id %" PRId64 ".", thread_id);
 280                 return ERROR_FAIL;
 281         }
 282
 283         if (!target_was_examined(curr)) {
 284                 LOG_ERROR("Target %d hasn't been examined yet.", curr->coreid);
 285                 return ERROR_FAIL;
 286         }
 287
 288         struct reg *reg = register_get_by_number(curr->reg_cache, reg_num, true);
 289         if (!reg) {
 290                 LOG_ERROR("Couldn't find register %" PRIu32 " in thread %" PRId64 ".", reg_num,
 291                                 thread_id);
 292                 return ERROR_FAIL;
 293         }
 294
 295         if (reg->type->get(reg) != ERROR_OK)
 296                 return ERROR_FAIL;
 297
 298         rtos_reg->number = reg->number;
 299         rtos_reg->size = reg->size;
 300         unsigned bytes = (reg->size + 7) / 8;
 301         assert(bytes <= sizeof(rtos_reg->value));
 302         memcpy(rtos_reg->value, reg->value, bytes);
 303
 304         return ERROR_OK;
 305 }
 306
 307 static int hwthread_set_reg(struct rtos *rtos, uint32_t reg_num, uint8_t *reg_value)
 308 {
 309         if (!rtos)
 310                 return ERROR_FAIL;
 311
 312         struct target *target = rtos->target;
 313
 314         struct target *curr = hwthread_find_thread(target, rtos->current_thread);
 315         if (!curr)
 316                 return ERROR_FAIL;
 317
 318         struct reg *reg = register_get_by_number(curr->reg_cache, reg_num, true);
 319         if (!reg)
 320                 return ERROR_FAIL;
 321
 322         return reg->type->set(reg, reg_value);
 323 }
 324
 325 static int hwthread_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[])
 326 {
 327         /* return an empty list, we don't have any symbols to look up */
 328         *symbol_list = calloc(1, sizeof(struct symbol_table_elem));
 329         (*symbol_list)[0].symbol_name = NULL;
 330         return 0;
 331 }
 332
 333 static int hwthread_target_for_threadid(struct connection *connection, int64_t thread_id, struct target **p_target)
 334 {
 335         struct target *target = get_target_from_connection(connection);
 336
 337         struct target *curr = hwthread_find_thread(target, thread_id);
 338         if (!curr)
 339                 return ERROR_FAIL;
 340
 341         *p_target = curr;
 342
 343         return ERROR_OK;
 344 }
 345
 346 static bool hwthread_detect_rtos(struct target *target)
 347 {
 348         /* always return 0, avoid auto-detection */
 349         return false;
 350 }
 351
 352 static int hwthread_thread_packet(struct connection *connection, const char *packet, int packet_size)
 353 {
 354         struct target *target = get_target_from_connection(connection);
 355
 356         struct target *curr = NULL;
 357         int64_t current_threadid;
 358
 359         if (packet[0] == 'H' && packet[1] == 'g') {
 360                 sscanf(packet, "Hg%16" SCNx64, &current_threadid);
 361
 362                 if (current_threadid > 0) {
 363                         if (hwthread_target_for_threadid(connection, current_threadid, &curr) != ERROR_OK) {
 364                                 LOG_ERROR("hwthread: cannot find thread id %"PRId64, current_threadid);
 365                                 gdb_put_packet(connection, "E01", 3);
 366                                 return ERROR_FAIL;
 367                         }
 368                         target->rtos->current_thread = current_threadid;
 369                 } else
 370                 if (current_threadid == 0 || current_threadid == -1)
 371                         target->rtos->current_thread = threadid_from_target(target);
 372
 373                 target->rtos->current_threadid = current_threadid;
 374
 375                 gdb_put_packet(connection, "OK", 2);
 376                 return ERROR_OK;
 377         }
 378
 379         return rtos_thread_packet(connection, packet, packet_size);
 380 }
 381
 382 static int hwthread_create(struct target *target)
 383 {
 384         LOG_INFO("Hardware thread awareness created");
 385
 386         target->rtos->rtos_specific_params = NULL;
 387         target->rtos->current_thread = 0;
 388         target->rtos->thread_details = NULL;
 389         target->rtos->gdb_target_for_threadid = hwthread_target_for_threadid;
 390         target->rtos->gdb_thread_packet = hwthread_thread_packet;
 391         return 0;
 392 }
 393
 394 static int hwthread_read_buffer(struct rtos *rtos, target_addr_t address,
 395                 uint32_t size, uint8_t *buffer)
 396 {
 397         if (!rtos)
 398                 return ERROR_FAIL;
 399
 400         struct target *target = rtos->target;
 401
 402         struct target *curr = hwthread_find_thread(target, rtos->current_thread);
 403         if (!curr)
 404                 return ERROR_FAIL;
 405
 406         return target_read_buffer(curr, address, size, buffer);
 407 }
 408
 409 static int hwthread_write_buffer(struct rtos *rtos, target_addr_t address,
 410                 uint32_t size, const uint8_t *buffer)
 411 {
 412         if (!rtos)
 413                 return ERROR_FAIL;
 414
 415         struct target *target = rtos->target;
 416
 417         struct target *curr = hwthread_find_thread(target, rtos->current_thread);
 418         if (!curr)
 419                 return ERROR_FAIL;
 420
 421         return target_write_buffer(curr, address, size, buffer);
 422 }