src/target/nds32_v3m.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2013 Andes Technology                                   *
   5  *   Hsiangkai Wang <hkwang@andestech.com>                                 *
   6  ***************************************************************************/
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include "config.h"
  10 #endif
  11
  12 #include "breakpoints.h"
  13 #include "nds32_cmd.h"
  14 #include "nds32_aice.h"
  15 #include "nds32_v3m.h"
  16 #include "nds32_v3_common.h"
  17
  18 static int nds32_v3m_activate_hardware_breakpoint(struct target *target)
  19 {
  20         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
  21         struct aice_port_s *aice = target_to_aice(target);
  22         struct breakpoint *bp;
  23         unsigned brp_num = nds32_v3m->n_hbr - 1;
  24
  25         for (bp = target->breakpoints; bp; bp = bp->next) {
  26                 if (bp->type == BKPT_SOFT) {
  27                         /* already set at nds32_v3m_add_breakpoint() */
  28                         continue;
  29                 } else if (bp->type == BKPT_HARD) {
  30                         /* set address */
  31                         aice_write_debug_reg(aice, NDS_EDM_SR_BPA0 + brp_num, bp->address);
  32                         /* set mask */
  33                         aice_write_debug_reg(aice, NDS_EDM_SR_BPAM0 + brp_num, 0);
  34
  35                         if (nds32_v3m->nds32.memory.address_translation)
  36                                 /* enable breakpoint (virtual address) */
  37                                 aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + brp_num, 0x2);
  38                         else
  39                                 /* enable breakpoint (physical address) */
  40                                 aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + brp_num, 0xA);
  41
  42                         LOG_DEBUG("Add hardware BP %u at %08" TARGET_PRIxADDR, brp_num,
  43                                         bp->address);
  44
  45                         brp_num--;
  46                 } else {
  47                         return ERROR_FAIL;
  48                 }
  49         }
  50
  51         return ERROR_OK;
  52 }
  53
  54 static int nds32_v3m_deactivate_hardware_breakpoint(struct target *target)
  55 {
  56         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
  57         struct aice_port_s *aice = target_to_aice(target);
  58         struct breakpoint *bp;
  59         unsigned brp_num = nds32_v3m->n_hbr - 1;
  60
  61         for (bp = target->breakpoints; bp; bp = bp->next) {
  62                 if (bp->type == BKPT_SOFT)
  63                         continue;
  64                 else if (bp->type == BKPT_HARD)
  65                         /* disable breakpoint */
  66                         aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + brp_num, 0x0);
  67                 else
  68                         return ERROR_FAIL;
  69
  70                 LOG_DEBUG("Remove hardware BP %u at %08" TARGET_PRIxADDR, brp_num,
  71                                 bp->address);
  72
  73                 brp_num--;
  74         }
  75
  76         return ERROR_OK;
  77 }
  78
  79 static int nds32_v3m_activate_hardware_watchpoint(struct target *target)
  80 {
  81         struct aice_port_s *aice = target_to_aice(target);
  82         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
  83         struct watchpoint *wp;
  84         int32_t  wp_num = 0;
  85         uint32_t wp_config = 0;
  86         bool ld_stop, st_stop;
  87
  88         if (nds32_v3m->nds32.global_stop)
  89                 ld_stop = st_stop = false;
  90
  91         for (wp = target->watchpoints; wp; wp = wp->next) {
  92
  93                 if (wp_num < nds32_v3m->used_n_wp) {
  94                         wp->mask = wp->length - 1;
  95                         if ((wp->address % wp->length) != 0)
  96                                 wp->mask = (wp->mask << 1) + 1;
  97
  98                         if (wp->rw == WPT_READ)
  99                                 wp_config = 0x3;
 100                         else if (wp->rw == WPT_WRITE)
 101                                 wp_config = 0x5;
 102                         else if (wp->rw == WPT_ACCESS)
 103                                 wp_config = 0x7;
 104
 105                         /* set/unset physical address bit of BPCn according to PSW.DT */
 106                         if (nds32_v3m->nds32.memory.address_translation == false)
 107                                 wp_config |= 0x8;
 108
 109                         /* set address */
 110                         aice_write_debug_reg(aice, NDS_EDM_SR_BPA0 + wp_num,
 111                                         wp->address - (wp->address % wp->length));
 112                         /* set mask */
 113                         aice_write_debug_reg(aice, NDS_EDM_SR_BPAM0 + wp_num, wp->mask);
 114                         /* enable watchpoint */
 115                         aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + wp_num, wp_config);
 116
 117                         LOG_DEBUG("Add hardware watchpoint %" PRId32 " at %08" TARGET_PRIxADDR
 118                                         " mask %08" PRIx32, wp_num, wp->address, wp->mask);
 119
 120                         wp_num++;
 121                 } else if (nds32_v3m->nds32.global_stop) {
 122                         if (wp->rw == WPT_READ)
 123                                 ld_stop = true;
 124                         else if (wp->rw == WPT_WRITE)
 125                                 st_stop = true;
 126                         else if (wp->rw == WPT_ACCESS)
 127                                 ld_stop = st_stop = true;
 128                 }
 129         }
 130
 131         if (nds32_v3m->nds32.global_stop) {
 132                 uint32_t edm_ctl;
 133                 aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CTL, &edm_ctl);
 134                 if (ld_stop)
 135                         edm_ctl |= 0x10;
 136                 if (st_stop)
 137                         edm_ctl |= 0x20;
 138                 aice_write_debug_reg(aice, NDS_EDM_SR_EDM_CTL, edm_ctl);
 139         }
 140
 141         return ERROR_OK;
 142 }
 143
 144 static int nds32_v3m_deactivate_hardware_watchpoint(struct target *target)
 145 {
 146         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
 147         struct aice_port_s *aice = target_to_aice(target);
 148         struct watchpoint *wp;
 149         int32_t wp_num = 0;
 150         bool clean_global_stop = false;
 151
 152         for (wp = target->watchpoints; wp; wp = wp->next) {
 153
 154                 if (wp_num < nds32_v3m->used_n_wp) {
 155                         /* disable watchpoint */
 156                         aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + wp_num, 0x0);
 157
 158                         LOG_DEBUG("Remove hardware watchpoint %" PRId32 " at %08" TARGET_PRIxADDR
 159                                         " mask %08" PRIx32, wp_num, wp->address, wp->mask);
 160                         wp_num++;
 161                 } else if (nds32_v3m->nds32.global_stop) {
 162                         clean_global_stop = true;
 163                 }
 164         }
 165
 166         if (clean_global_stop) {
 167                 uint32_t edm_ctl;
 168                 aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CTL, &edm_ctl);
 169                 edm_ctl = edm_ctl & (~0x30);
 170                 aice_write_debug_reg(aice, NDS_EDM_SR_EDM_CTL, edm_ctl);
 171         }
 172
 173         return ERROR_OK;
 174 }
 175
 176 static int nds32_v3m_check_interrupt_stack(struct nds32 *nds32)
 177 {
 178         uint32_t val_ir0;
 179         uint32_t value;
 180
 181         /* Save interrupt level */
 182         nds32_get_mapped_reg(nds32, IR0, &val_ir0);
 183         nds32->current_interrupt_level = (val_ir0 >> 1) & 0x3;
 184
 185         if (nds32_reach_max_interrupt_level(nds32))
 186                 LOG_ERROR("<-- TARGET ERROR! Reaching the max interrupt stack level %" PRIu32 ". -->",
 187                                 nds32->current_interrupt_level);
 188
 189         /* backup $ir6 to avoid suppressed exception overwrite */
 190         nds32_get_mapped_reg(nds32, IR6, &value);
 191
 192         return ERROR_OK;
 193 }
 194
 195 static int nds32_v3m_restore_interrupt_stack(struct nds32 *nds32)
 196 {
 197         uint32_t value;
 198
 199         /* get backup value from cache */
 200         /* then set back to make the register dirty */
 201         nds32_get_mapped_reg(nds32, IR0, &value);
 202         nds32_set_mapped_reg(nds32, IR0, value);
 203
 204         nds32_get_mapped_reg(nds32, IR6, &value);
 205         nds32_set_mapped_reg(nds32, IR6, value);
 206
 207         return ERROR_OK;
 208 }
 209
 210 static int nds32_v3m_deassert_reset(struct target *target)
 211 {
 212         int retval;
 213
 214         CHECK_RETVAL(nds32_poll(target));
 215
 216         if (target->state != TARGET_HALTED) {
 217                 /* reset only */
 218                 LOG_WARNING("%s: ran after reset and before halt ...",
 219                                 target_name(target));
 220                 retval = target_halt(target);
 221                 if (retval != ERROR_OK)
 222                         return retval;
 223
 224         }
 225
 226         return ERROR_OK;
 227 }
 228
 229 static int nds32_v3m_add_breakpoint(struct target *target,
 230                 struct breakpoint *breakpoint)
 231 {
 232         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
 233         struct nds32 *nds32 = &(nds32_v3m->nds32);
 234         int result;
 235
 236         if (breakpoint->type == BKPT_HARD) {
 237                 /* check hardware resource */
 238                 if (nds32_v3m->next_hbr_index < nds32_v3m->next_hwp_index) {
 239                         LOG_WARNING("<-- TARGET WARNING! Insert too many "
 240                                         "hardware breakpoints/watchpoints! "
 241                                         "The limit of combined hardware "
 242                                         "breakpoints/watchpoints is %" PRId32 ". -->",
 243                                         nds32_v3m->n_hbr);
 244                         LOG_WARNING("<-- TARGET STATUS: Inserted number of "
 245                                         "hardware breakpoint: %" PRId32 ", hardware "
 246                                         "watchpoints: %" PRId32 ". -->",
 247                                         nds32_v3m->n_hbr - nds32_v3m->next_hbr_index - 1,
 248                                         nds32_v3m->used_n_wp);
 249                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 250                 }
 251
 252                 /* update next place to put hardware breakpoint */
 253                 nds32_v3m->next_hbr_index--;
 254
 255                 /* hardware breakpoint insertion occurs before 'continue' actually */
 256                 return ERROR_OK;
 257         } else if (breakpoint->type == BKPT_SOFT) {
 258                 result = nds32_add_software_breakpoint(target, breakpoint);
 259                 if (result != ERROR_OK) {
 260                         /* auto convert to hardware breakpoint if failed */
 261                         if (nds32->auto_convert_hw_bp) {
 262                                 /* convert to hardware breakpoint */
 263                                 breakpoint->type = BKPT_HARD;
 264
 265                                 return nds32_v3m_add_breakpoint(target, breakpoint);
 266                         }
 267                 }
 268
 269                 return result;
 270         } else /* unrecognized breakpoint type */
 271                 return ERROR_FAIL;
 272
 273         return ERROR_OK;
 274 }
 275
 276 static int nds32_v3m_remove_breakpoint(struct target *target,
 277                 struct breakpoint *breakpoint)
 278 {
 279         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
 280
 281         if (breakpoint->type == BKPT_HARD) {
 282                 if (nds32_v3m->next_hbr_index >= nds32_v3m->n_hbr - 1)
 283                         return ERROR_FAIL;
 284
 285                 /* update next place to put hardware breakpoint */
 286                 nds32_v3m->next_hbr_index++;
 287
 288                 /* hardware breakpoint removal occurs after 'halted' actually */
 289                 return ERROR_OK;
 290         } else if (breakpoint->type == BKPT_SOFT) {
 291                 return nds32_remove_software_breakpoint(target, breakpoint);
 292         } else /* unrecognized breakpoint type */
 293                 return ERROR_FAIL;
 294
 295         return ERROR_OK;
 296 }
 297
 298 static int nds32_v3m_add_watchpoint(struct target *target,
 299                 struct watchpoint *watchpoint)
 300 {
 301         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
 302
 303         /* check hardware resource */
 304         if (nds32_v3m->next_hwp_index >= nds32_v3m->n_hwp) {
 305                 /* No hardware resource */
 306                 if (nds32_v3m->nds32.global_stop) {
 307                         LOG_WARNING("<-- TARGET WARNING! The number of "
 308                                         "watchpoints exceeds the hardware "
 309                                         "resources. Stop at every load/store "
 310                                         "instruction to check for watchpoint matches. -->");
 311                         return ERROR_OK;
 312                 }
 313
 314                 LOG_WARNING("<-- TARGET WARNING! Insert too many hardware "
 315                                 "watchpoints! The limit of hardware watchpoints "
 316                                 "is %" PRId32 ". -->", nds32_v3m->n_hwp);
 317                 LOG_WARNING("<-- TARGET STATUS: Inserted number of "
 318                                 "hardware watchpoint: %" PRId32 ". -->",
 319                                 nds32_v3m->used_n_wp);
 320                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 321         }
 322
 323         if (nds32_v3m->next_hwp_index > nds32_v3m->next_hbr_index) {
 324                 /* No hardware resource */
 325                 if (nds32_v3m->nds32.global_stop) {
 326                         LOG_WARNING("<-- TARGET WARNING! The number of "
 327                                         "watchpoints exceeds the hardware "
 328                                         "resources. Stop at every load/store "
 329                                         "instruction to check for watchpoint matches. -->");
 330                         return ERROR_OK;
 331                 }
 332
 333                 LOG_WARNING("<-- TARGET WARNING! Insert too many hardware "
 334                                 "breakpoints/watchpoints! The limit of combined "
 335                                 "hardware breakpoints/watchpoints is %" PRId32 ". -->",
 336                                 nds32_v3m->n_hbr);
 337                 LOG_WARNING("<-- TARGET STATUS: Inserted number of "
 338                                 "hardware breakpoint: %" PRId32 ", hardware "
 339                                 "watchpoints: %" PRId32 ". -->",
 340                                 nds32_v3m->n_hbr - nds32_v3m->next_hbr_index - 1,
 341                                 nds32_v3m->used_n_wp);
 342                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 343         }
 344
 345         /* update next place to put hardware watchpoint */
 346         nds32_v3m->next_hwp_index++;
 347         nds32_v3m->used_n_wp++;
 348
 349         return ERROR_OK;
 350 }
 351
 352 static int nds32_v3m_remove_watchpoint(struct target *target,
 353                 struct watchpoint *watchpoint)
 354 {
 355         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
 356
 357         if (nds32_v3m->next_hwp_index <= 0) {
 358                 if (nds32_v3m->nds32.global_stop)
 359                         return ERROR_OK;
 360
 361                 return ERROR_FAIL;
 362         }
 363
 364         /* update next place to put hardware watchpoint */
 365         nds32_v3m->next_hwp_index--;
 366         nds32_v3m->used_n_wp--;
 367
 368         return ERROR_OK;
 369 }
 370
 371 static struct nds32_v3_common_callback nds32_v3m_common_callback = {
 372         .check_interrupt_stack = nds32_v3m_check_interrupt_stack,
 373         .restore_interrupt_stack = nds32_v3m_restore_interrupt_stack,
 374         .activate_hardware_breakpoint = nds32_v3m_activate_hardware_breakpoint,
 375         .activate_hardware_watchpoint = nds32_v3m_activate_hardware_watchpoint,
 376         .deactivate_hardware_breakpoint = nds32_v3m_deactivate_hardware_breakpoint,
 377         .deactivate_hardware_watchpoint = nds32_v3m_deactivate_hardware_watchpoint,
 378 };
 379
 380 static int nds32_v3m_target_create(struct target *target, Jim_Interp *interp)
 381 {
 382         struct nds32_v3m_common *nds32_v3m;
 383
 384         nds32_v3m = calloc(1, sizeof(*nds32_v3m));
 385         if (!nds32_v3m)
 386                 return ERROR_FAIL;
 387
 388         nds32_v3_common_register_callback(&nds32_v3m_common_callback);
 389         nds32_v3_target_create_common(target, &(nds32_v3m->nds32));
 390
 391         return ERROR_OK;
 392 }
 393
 394 /* talk to the target and set things up */
 395 static int nds32_v3m_examine(struct target *target)
 396 {
 397         struct nds32_v3m_common *nds32_v3m = target_to_nds32_v3m(target);
 398         struct nds32 *nds32 = &(nds32_v3m->nds32);
 399         struct aice_port_s *aice = target_to_aice(target);
 400
 401         if (!target_was_examined(target)) {
 402                 CHECK_RETVAL(nds32_edm_config(nds32));
 403
 404                 if (nds32->reset_halt_as_examine)
 405                         CHECK_RETVAL(nds32_reset_halt(nds32));
 406         }
 407
 408         uint32_t edm_cfg;
 409         aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CFG, &edm_cfg);
 410
 411         /* get the number of hardware breakpoints */
 412         nds32_v3m->n_hbr = (edm_cfg & 0x7) + 1;
 413         nds32_v3m->used_n_wp = 0;
 414
 415         /* get the number of hardware watchpoints */
 416         /* If the WP field is hardwired to zero, it means this is a
 417          * simple breakpoint.  Otherwise, if the WP field is writable
 418          * then it means this is a regular watchpoints. */
 419         nds32_v3m->n_hwp = 0;
 420         for (int32_t i = 0 ; i < nds32_v3m->n_hbr ; i++) {
 421                 /** check the hardware breakpoint is simple or not */
 422                 uint32_t tmp_value;
 423                 aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + i, 0x1);
 424                 aice_read_debug_reg(aice, NDS_EDM_SR_BPC0 + i, &tmp_value);
 425
 426                 if (tmp_value)
 427                         nds32_v3m->n_hwp++;
 428         }
 429         /* hardware breakpoint is inserted from high index to low index */
 430         nds32_v3m->next_hbr_index = nds32_v3m->n_hbr - 1;
 431         /* hardware watchpoint is inserted from low index to high index */
 432         nds32_v3m->next_hwp_index = 0;
 433
 434         LOG_INFO("%s: total hardware breakpoint %" PRId32 " (simple breakpoint %" PRId32 ")",
 435                         target_name(target), nds32_v3m->n_hbr, nds32_v3m->n_hbr - nds32_v3m->n_hwp);
 436         LOG_INFO("%s: total hardware watchpoint %" PRId32, target_name(target), nds32_v3m->n_hwp);
 437
 438         nds32->target->state = TARGET_RUNNING;
 439         nds32->target->debug_reason = DBG_REASON_NOTHALTED;
 440
 441         target_set_examined(target);
 442
 443         return ERROR_OK;
 444 }
 445
 446 /** Holds methods for NDS32 V3m targets. */
 447 struct target_type nds32_v3m_target = {
 448         .name = "nds32_v3m",
 449
 450         .poll = nds32_poll,
 451         .arch_state = nds32_arch_state,
 452
 453         .target_request_data = nds32_v3_target_request_data,
 454
 455         .halt = nds32_halt,
 456         .resume = nds32_resume,
 457         .step = nds32_step,
 458
 459         .assert_reset = nds32_assert_reset,
 460         .deassert_reset = nds32_v3m_deassert_reset,
 461
 462         /* register access */
 463         .get_gdb_reg_list = nds32_get_gdb_reg_list,
 464
 465         /* memory access */
 466         .read_buffer = nds32_v3_read_buffer,
 467         .write_buffer = nds32_v3_write_buffer,
 468         .read_memory = nds32_v3_read_memory,
 469         .write_memory = nds32_v3_write_memory,
 470
 471         .checksum_memory = nds32_v3_checksum_memory,
 472
 473         /* breakpoint/watchpoint */
 474         .add_breakpoint = nds32_v3m_add_breakpoint,
 475         .remove_breakpoint = nds32_v3m_remove_breakpoint,
 476         .add_watchpoint = nds32_v3m_add_watchpoint,
 477         .remove_watchpoint = nds32_v3m_remove_watchpoint,
 478         .hit_watchpoint = nds32_v3_hit_watchpoint,
 479
 480         /* MMU */
 481         .mmu = nds32_mmu,
 482         .virt2phys = nds32_virtual_to_physical,
 483         .read_phys_memory = nds32_read_phys_memory,
 484         .write_phys_memory = nds32_write_phys_memory,
 485
 486         .run_algorithm = nds32_v3_run_algorithm,
 487
 488         .commands = nds32_command_handlers,
 489         .target_create = nds32_v3m_target_create,
 490         .init_target = nds32_v3_init_target,
 491         .examine = nds32_v3m_examine,
 492
 493         .get_gdb_fileio_info = nds32_get_gdb_fileio_info,
 494         .gdb_fileio_end = nds32_gdb_fileio_end,
 495 };