src/target/breakpoints.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) ST-Ericsson SA 2011                                     *
   6  *   michel.jaouen@stericsson.com : smp minimum support                    *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "target.h"
  27 #include <helper/log.h>
  28 #include "breakpoints.h"
  29
  30 static const char * const breakpoint_type_strings[] = {
  31         "hardware",
  32         "software"
  33 };
  34
  35 static const char * const watchpoint_rw_strings[] = {
  36         "read",
  37         "write",
  38         "access"
  39 };
  40
  41 /* monotonic counter/id-number for breakpoints and watch points */
  42 static int bpwp_unique_id;
  43
  44 int breakpoint_add_internal(struct target *target,
  45         uint32_t address,
  46         uint32_t length,
  47         enum breakpoint_type type)
  48 {
  49         struct breakpoint *breakpoint = target->breakpoints;
  50         struct breakpoint **breakpoint_p = &target->breakpoints;
  51         const char *reason;
  52         int retval;
  53         int n;
  54
  55         n = 0;
  56         while (breakpoint) {
  57                 n++;
  58                 if (breakpoint->address == address) {
  59                         /* FIXME don't assume "same address" means "same
  60                          * breakpoint" ... check all the parameters before
  61                          * succeeding.
  62                          */
  63                         LOG_DEBUG("Duplicate Breakpoint address: 0x%08" PRIx32 " (BP %" PRIu32 ")",
  64                                 address, breakpoint->unique_id);
  65                         return ERROR_OK;
  66                 }
  67                 breakpoint_p = &breakpoint->next;
  68                 breakpoint = breakpoint->next;
  69         }
  70
  71         (*breakpoint_p) = malloc(sizeof(struct breakpoint));
  72         (*breakpoint_p)->address = address;
  73         (*breakpoint_p)->asid = 0;
  74         (*breakpoint_p)->length = length;
  75         (*breakpoint_p)->type = type;
  76         (*breakpoint_p)->set = 0;
  77         (*breakpoint_p)->orig_instr = malloc(length);
  78         (*breakpoint_p)->next = NULL;
  79         (*breakpoint_p)->unique_id = bpwp_unique_id++;
  80
  81         retval = target_add_breakpoint(target, *breakpoint_p);
  82         switch (retval) {
  83                 case ERROR_OK:
  84                         break;
  85                 case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
  86                         reason = "resource not available";
  87                         goto fail;
  88                 case ERROR_TARGET_NOT_HALTED:
  89                         reason = "target running";
  90                         goto fail;
  91                 default:
  92                         reason = "unknown reason";
  93 fail:
  94                         LOG_ERROR("can't add breakpoint: %s", reason);
  95                         free((*breakpoint_p)->orig_instr);
  96                         free(*breakpoint_p);
  97                         *breakpoint_p = NULL;
  98                         return retval;
  99         }
 100
 101         LOG_DEBUG("added %s breakpoint at 0x%8.8" PRIx32 " of length 0x%8.8x, (BPID: %" PRIu32 ")",
 102                 breakpoint_type_strings[(*breakpoint_p)->type],
 103                 (*breakpoint_p)->address, (*breakpoint_p)->length,
 104                 (*breakpoint_p)->unique_id);
 105
 106         return ERROR_OK;
 107 }
 108
 109 int context_breakpoint_add_internal(struct target *target,
 110         uint32_t asid,
 111         uint32_t length,
 112         enum breakpoint_type type)
 113 {
 114         struct breakpoint *breakpoint = target->breakpoints;
 115         struct breakpoint **breakpoint_p = &target->breakpoints;
 116         int retval;
 117         int n;
 118
 119         n = 0;
 120         while (breakpoint) {
 121                 n++;
 122                 if (breakpoint->asid == asid) {
 123                         /* FIXME don't assume "same address" means "same
 124                          * breakpoint" ... check all the parameters before
 125                          * succeeding.
 126                          */
 127                         LOG_DEBUG("Duplicate Breakpoint asid: 0x%08" PRIx32 " (BP %" PRIu32 ")",
 128                                 asid, breakpoint->unique_id);
 129                         return -1;
 130                 }
 131                 breakpoint_p = &breakpoint->next;
 132                 breakpoint = breakpoint->next;
 133         }
 134
 135         (*breakpoint_p) = malloc(sizeof(struct breakpoint));
 136         (*breakpoint_p)->address = 0;
 137         (*breakpoint_p)->asid = asid;
 138         (*breakpoint_p)->length = length;
 139         (*breakpoint_p)->type = type;
 140         (*breakpoint_p)->set = 0;
 141         (*breakpoint_p)->orig_instr = malloc(length);
 142         (*breakpoint_p)->next = NULL;
 143         (*breakpoint_p)->unique_id = bpwp_unique_id++;
 144         retval = target_add_context_breakpoint(target, *breakpoint_p);
 145         if (retval != ERROR_OK) {
 146                 LOG_ERROR("could not add breakpoint");
 147                 free((*breakpoint_p)->orig_instr);
 148                 free(*breakpoint_p);
 149                 *breakpoint_p = NULL;
 150                 return retval;
 151         }
 152
 153         LOG_DEBUG("added %s Context breakpoint at 0x%8.8" PRIx32 " of length 0x%8.8x, (BPID: %" PRIu32 ")",
 154                 breakpoint_type_strings[(*breakpoint_p)->type],
 155                 (*breakpoint_p)->asid, (*breakpoint_p)->length,
 156                 (*breakpoint_p)->unique_id);
 157
 158         return ERROR_OK;
 159 }
 160
 161 int hybrid_breakpoint_add_internal(struct target *target,
 162         uint32_t address,
 163         uint32_t asid,
 164         uint32_t length,
 165         enum breakpoint_type type)
 166 {
 167         struct breakpoint *breakpoint = target->breakpoints;
 168         struct breakpoint **breakpoint_p = &target->breakpoints;
 169         int retval;
 170         int n;
 171         n = 0;
 172         while (breakpoint) {
 173                 n++;
 174                 if ((breakpoint->asid == asid) && (breakpoint->address == address)) {
 175                         /* FIXME don't assume "same address" means "same
 176                          * breakpoint" ... check all the parameters before
 177                          * succeeding.
 178                          */
 179                         LOG_DEBUG("Duplicate Hybrid Breakpoint asid: 0x%08" PRIx32 " (BP %" PRIu32 ")",
 180                                 asid, breakpoint->unique_id);
 181                         return -1;
 182                 } else if ((breakpoint->address == address) && (breakpoint->asid == 0)) {
 183                         LOG_DEBUG("Duplicate Breakpoint IVA: 0x%08" PRIx32 " (BP %" PRIu32 ")",
 184                                 address, breakpoint->unique_id);
 185                         return -1;
 186
 187                 }
 188                 breakpoint_p = &breakpoint->next;
 189                 breakpoint = breakpoint->next;
 190         }
 191         (*breakpoint_p) = malloc(sizeof(struct breakpoint));
 192         (*breakpoint_p)->address = address;
 193         (*breakpoint_p)->asid = asid;
 194         (*breakpoint_p)->length = length;
 195         (*breakpoint_p)->type = type;
 196         (*breakpoint_p)->set = 0;
 197         (*breakpoint_p)->orig_instr = malloc(length);
 198         (*breakpoint_p)->next = NULL;
 199         (*breakpoint_p)->unique_id = bpwp_unique_id++;
 200
 201
 202         retval = target_add_hybrid_breakpoint(target, *breakpoint_p);
 203         if (retval != ERROR_OK) {
 204                 LOG_ERROR("could not add breakpoint");
 205                 free((*breakpoint_p)->orig_instr);
 206                 free(*breakpoint_p);
 207                 *breakpoint_p = NULL;
 208                 return retval;
 209         }
 210         LOG_DEBUG(
 211                 "added %s Hybrid breakpoint at address 0x%8.8" PRIx32 " of length 0x%8.8x, (BPID: %" PRIu32 ")",
 212                 breakpoint_type_strings[(*breakpoint_p)->type],
 213                 (*breakpoint_p)->address,
 214                 (*breakpoint_p)->length,
 215                 (*breakpoint_p)->unique_id);
 216
 217         return ERROR_OK;
 218 }
 219
 220 int breakpoint_add(struct target *target,
 221         uint32_t address,
 222         uint32_t length,
 223         enum breakpoint_type type)
 224 {
 225         int retval = ERROR_OK;
 226         if (target->smp) {
 227                 struct target_list *head;
 228                 struct target *curr;
 229                 head = target->head;
 230                 if (type == BKPT_SOFT)
 231                         return breakpoint_add_internal(head->target, address, length, type);
 232
 233                 while (head != (struct target_list *)NULL) {
 234                         curr = head->target;
 235                         retval = breakpoint_add_internal(curr, address, length, type);
 236                         if (retval != ERROR_OK)
 237                                 return retval;
 238                         head = head->next;
 239                 }
 240                 return retval;
 241         } else
 242                 return breakpoint_add_internal(target, address, length, type);
 243 }
 244 int context_breakpoint_add(struct target *target,
 245         uint32_t asid,
 246         uint32_t length,
 247         enum breakpoint_type type)
 248 {
 249         int retval = ERROR_OK;
 250         if (target->smp) {
 251                 struct target_list *head;
 252                 struct target *curr;
 253                 head = target->head;
 254                 while (head != (struct target_list *)NULL) {
 255                         curr = head->target;
 256                         retval = context_breakpoint_add_internal(curr, asid, length, type);
 257                         if (retval != ERROR_OK)
 258                                 return retval;
 259                         head = head->next;
 260                 }
 261                 return retval;
 262         } else
 263                 return context_breakpoint_add_internal(target, asid, length, type);
 264 }
 265 int hybrid_breakpoint_add(struct target *target,
 266         uint32_t address,
 267         uint32_t asid,
 268         uint32_t length,
 269         enum breakpoint_type type)
 270 {
 271         int retval = ERROR_OK;
 272         if (target->smp) {
 273                 struct target_list *head;
 274                 struct target *curr;
 275                 head = target->head;
 276                 while (head != (struct target_list *)NULL) {
 277                         curr = head->target;
 278                         retval = hybrid_breakpoint_add_internal(curr, address, asid, length, type);
 279                         if (retval != ERROR_OK)
 280                                 return retval;
 281                         head = head->next;
 282                 }
 283                 return retval;
 284         } else
 285                 return hybrid_breakpoint_add_internal(target, address, asid, length, type);
 286 }
 287
 288 /* free up a breakpoint */
 289 static void breakpoint_free(struct target *target, struct breakpoint *breakpoint_to_remove)
 290 {
 291         struct breakpoint *breakpoint = target->breakpoints;
 292         struct breakpoint **breakpoint_p = &target->breakpoints;
 293         int retval;
 294
 295         while (breakpoint) {
 296                 if (breakpoint == breakpoint_to_remove)
 297                         break;
 298                 breakpoint_p = &breakpoint->next;
 299                 breakpoint = breakpoint->next;
 300         }
 301
 302         if (breakpoint == NULL)
 303                 return;
 304
 305         retval = target_remove_breakpoint(target, breakpoint);
 306
 307         LOG_DEBUG("free BPID: %" PRIu32 " --> %d", breakpoint->unique_id, retval);
 308         (*breakpoint_p) = breakpoint->next;
 309         free(breakpoint->orig_instr);
 310         free(breakpoint);
 311 }
 312
 313 int breakpoint_remove_internal(struct target *target, uint32_t address)
 314 {
 315         struct breakpoint *breakpoint = target->breakpoints;
 316
 317         while (breakpoint) {
 318                 if ((breakpoint->address == address) && (breakpoint->asid == 0))
 319                         break;
 320                 else if ((breakpoint->address == 0) && (breakpoint->asid == address))
 321                         break;
 322                 else if ((breakpoint->address == address) && (breakpoint->asid != 0))
 323                         break;
 324                 breakpoint = breakpoint->next;
 325         }
 326
 327         if (breakpoint) {
 328                 breakpoint_free(target, breakpoint);
 329                 return 1;
 330         } else {
 331                 if (!target->smp)
 332                         LOG_ERROR("no breakpoint at address 0x%8.8" PRIx32 " found", address);
 333                 return 0;
 334         }
 335 }
 336 void breakpoint_remove(struct target *target, uint32_t address)
 337 {
 338         int found = 0;
 339         if (target->smp) {
 340                 struct target_list *head;
 341                 struct target *curr;
 342                 head = target->head;
 343                 while (head != (struct target_list *)NULL) {
 344                         curr = head->target;
 345                         found += breakpoint_remove_internal(curr, address);
 346                         head = head->next;
 347                 }
 348                 if (found == 0)
 349                         LOG_ERROR("no breakpoint at address 0x%8.8" PRIx32 " found", address);
 350         } else
 351                 breakpoint_remove_internal(target, address);
 352 }
 353
 354 void breakpoint_clear_target_internal(struct target *target)
 355 {
 356         LOG_DEBUG("Delete all breakpoints for target: %s",
 357                 target_name(target));
 358         while (target->breakpoints != NULL)
 359                 breakpoint_free(target, target->breakpoints);
 360 }
 361
 362 void breakpoint_clear_target(struct target *target)
 363 {
 364         if (target->smp) {
 365                 struct target_list *head;
 366                 struct target *curr;
 367                 head = target->head;
 368                 while (head != (struct target_list *)NULL) {
 369                         curr = head->target;
 370                         breakpoint_clear_target_internal(curr);
 371                         head = head->next;
 372                 }
 373         } else
 374                 breakpoint_clear_target_internal(target);
 375
 376 }
 377
 378 struct breakpoint *breakpoint_find(struct target *target, uint32_t address)
 379 {
 380         struct breakpoint *breakpoint = target->breakpoints;
 381
 382         while (breakpoint) {
 383                 if (breakpoint->address == address)
 384                         return breakpoint;
 385                 breakpoint = breakpoint->next;
 386         }
 387
 388         return NULL;
 389 }
 390
 391 int watchpoint_add(struct target *target, uint32_t address, uint32_t length,
 392         enum watchpoint_rw rw, uint32_t value, uint32_t mask)
 393 {
 394         struct watchpoint *watchpoint = target->watchpoints;
 395         struct watchpoint **watchpoint_p = &target->watchpoints;
 396         int retval;
 397         const char *reason;
 398
 399         while (watchpoint) {
 400                 if (watchpoint->address == address) {
 401                         if (watchpoint->length != length
 402                                 || watchpoint->value != value
 403                                 || watchpoint->mask != mask
 404                                 || watchpoint->rw != rw) {
 405                                 LOG_ERROR("address 0x%8.8" PRIx32
 406                                         " already has watchpoint %d",
 407                                         address, watchpoint->unique_id);
 408                                 return ERROR_FAIL;
 409                         }
 410
 411                         /* ignore duplicate watchpoint */
 412                         return ERROR_OK;
 413                 }
 414                 watchpoint_p = &watchpoint->next;
 415                 watchpoint = watchpoint->next;
 416         }
 417
 418         (*watchpoint_p) = calloc(1, sizeof(struct watchpoint));
 419         (*watchpoint_p)->address = address;
 420         (*watchpoint_p)->length = length;
 421         (*watchpoint_p)->value = value;
 422         (*watchpoint_p)->mask = mask;
 423         (*watchpoint_p)->rw = rw;
 424         (*watchpoint_p)->unique_id = bpwp_unique_id++;
 425
 426         retval = target_add_watchpoint(target, *watchpoint_p);
 427         switch (retval) {
 428                 case ERROR_OK:
 429                         break;
 430                 case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
 431                         reason = "resource not available";
 432                         goto bye;
 433                 case ERROR_TARGET_NOT_HALTED:
 434                         reason = "target running";
 435                         goto bye;
 436                 default:
 437                         reason = "unrecognized error";
 438 bye:
 439                         LOG_ERROR("can't add %s watchpoint at 0x%8.8" PRIx32 ", %s",
 440                                 watchpoint_rw_strings[(*watchpoint_p)->rw],
 441                                 address, reason);
 442                         free(*watchpoint_p);
 443                         *watchpoint_p = NULL;
 444                         return retval;
 445         }
 446
 447         LOG_DEBUG("added %s watchpoint at 0x%8.8" PRIx32
 448                 " of length 0x%8.8" PRIx32 " (WPID: %d)",
 449                 watchpoint_rw_strings[(*watchpoint_p)->rw],
 450                 (*watchpoint_p)->address,
 451                 (*watchpoint_p)->length,
 452                 (*watchpoint_p)->unique_id);
 453
 454         return ERROR_OK;
 455 }
 456
 457 static void watchpoint_free(struct target *target, struct watchpoint *watchpoint_to_remove)
 458 {
 459         struct watchpoint *watchpoint = target->watchpoints;
 460         struct watchpoint **watchpoint_p = &target->watchpoints;
 461         int retval;
 462
 463         while (watchpoint) {
 464                 if (watchpoint == watchpoint_to_remove)
 465                         break;
 466                 watchpoint_p = &watchpoint->next;
 467                 watchpoint = watchpoint->next;
 468         }
 469
 470         if (watchpoint == NULL)
 471                 return;
 472         retval = target_remove_watchpoint(target, watchpoint);
 473         LOG_DEBUG("free WPID: %d --> %d", watchpoint->unique_id, retval);
 474         (*watchpoint_p) = watchpoint->next;
 475         free(watchpoint);
 476 }
 477
 478 void watchpoint_remove(struct target *target, uint32_t address)
 479 {
 480         struct watchpoint *watchpoint = target->watchpoints;
 481
 482         while (watchpoint) {
 483                 if (watchpoint->address == address)
 484                         break;
 485                 watchpoint = watchpoint->next;
 486         }
 487
 488         if (watchpoint)
 489                 watchpoint_free(target, watchpoint);
 490         else
 491                 LOG_ERROR("no watchpoint at address 0x%8.8" PRIx32 " found", address);
 492 }
 493
 494 void watchpoint_clear_target(struct target *target)
 495 {
 496         LOG_DEBUG("Delete all watchpoints for target: %s",
 497                 target_name(target));
 498         while (target->watchpoints != NULL)
 499                 watchpoint_free(target, target->watchpoints);
 500 }
 501
 502 int watchpoint_hit(struct target *target, enum watchpoint_rw *rw, uint32_t *address)
 503 {
 504         int retval;
 505         struct watchpoint *hit_watchpoint;
 506
 507         retval = target_hit_watchpoint(target, &hit_watchpoint);
 508         if (retval != ERROR_OK)
 509                 return ERROR_FAIL;
 510
 511         *rw = hit_watchpoint->rw;
 512         *address = hit_watchpoint->address;
 513
 514         LOG_DEBUG("Found hit watchpoint at 0x%8.8" PRIx32 " (WPID: %d)",
 515                 hit_watchpoint->address,
 516                 hit_watchpoint->unique_id);
 517
 518         return ERROR_OK;
 519 }