src/target/nds32_v3.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_v3.h"
  16 #include "nds32_v3_common.h"
  17
  18 static int nds32_v3_activate_hardware_breakpoint(struct target *target)
  19 {
  20         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
  21         struct aice_port_s *aice = target_to_aice(target);
  22         struct breakpoint *bp;
  23         int32_t hbr_index = nds32_v3->next_hbr_index;
  24
  25         for (bp = target->breakpoints; bp; bp = bp->next) {
  26                 if (bp->type == BKPT_SOFT) {
  27                         /* already set at nds32_v3_add_breakpoint() */
  28                         continue;
  29                 } else if (bp->type == BKPT_HARD) {
  30                         hbr_index--;
  31                         /* set address */
  32                         aice_write_debug_reg(aice, NDS_EDM_SR_BPA0 + hbr_index, bp->address);
  33                         /* set mask */
  34                         aice_write_debug_reg(aice, NDS_EDM_SR_BPAM0 + hbr_index, 0);
  35                         /* set value */
  36                         aice_write_debug_reg(aice, NDS_EDM_SR_BPV0 + hbr_index, 0);
  37
  38                         if (nds32_v3->nds32.memory.address_translation)
  39                                 /* enable breakpoint (virtual address) */
  40                                 aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + hbr_index, 0x2);
  41                         else
  42                                 /* enable breakpoint (physical address) */
  43                                 aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + hbr_index, 0xA);
  44
  45                         LOG_DEBUG("Add hardware BP %" PRId32 " at %08" TARGET_PRIxADDR, hbr_index,
  46                                         bp->address);
  47                 } else {
  48                         return ERROR_FAIL;
  49                 }
  50         }
  51
  52         return ERROR_OK;
  53 }
  54
  55 static int nds32_v3_deactivate_hardware_breakpoint(struct target *target)
  56 {
  57         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
  58         struct aice_port_s *aice = target_to_aice(target);
  59         struct breakpoint *bp;
  60         int32_t hbr_index = nds32_v3->next_hbr_index;
  61
  62         for (bp = target->breakpoints; bp; bp = bp->next) {
  63                 if (bp->type == BKPT_SOFT) {
  64                         continue;
  65                 } else if (bp->type == BKPT_HARD) {
  66                         hbr_index--;
  67                         /* disable breakpoint */
  68                         aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + hbr_index, 0x0);
  69                 } else {
  70                         return ERROR_FAIL;
  71                 }
  72
  73                 LOG_DEBUG("Remove hardware BP %" PRId32 " at %08" TARGET_PRIxADDR, hbr_index,
  74                                 bp->address);
  75         }
  76
  77         return ERROR_OK;
  78 }
  79
  80 static int nds32_v3_activate_hardware_watchpoint(struct target *target)
  81 {
  82         struct aice_port_s *aice = target_to_aice(target);
  83         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
  84         struct watchpoint *wp;
  85         int32_t wp_num = 0;
  86         uint32_t wp_config = 0;
  87         bool ld_stop, st_stop;
  88
  89         if (nds32_v3->nds32.global_stop)
  90                 ld_stop = st_stop = false;
  91
  92         for (wp = target->watchpoints; wp; wp = wp->next) {
  93
  94                 if (wp_num < nds32_v3->used_n_wp) {
  95                         wp->mask = wp->length - 1;
  96                         if ((wp->address % wp->length) != 0)
  97                                 wp->mask = (wp->mask << 1) + 1;
  98
  99                         if (wp->rw == WPT_READ)
 100                                 wp_config = 0x3;
 101                         else if (wp->rw == WPT_WRITE)
 102                                 wp_config = 0x5;
 103                         else if (wp->rw == WPT_ACCESS)
 104                                 wp_config = 0x7;
 105
 106                         /* set/unset physical address bit of BPCn according to PSW.DT */
 107                         if (nds32_v3->nds32.memory.address_translation == false)
 108                                 wp_config |= 0x8;
 109
 110                         /* set address */
 111                         aice_write_debug_reg(aice, NDS_EDM_SR_BPA0 + wp_num,
 112                                         wp->address - (wp->address % wp->length));
 113                         /* set mask */
 114                         aice_write_debug_reg(aice, NDS_EDM_SR_BPAM0 + wp_num, wp->mask);
 115                         /* enable watchpoint */
 116                         aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + wp_num, wp_config);
 117                         /* set value */
 118                         aice_write_debug_reg(aice, NDS_EDM_SR_BPV0 + wp_num, 0);
 119
 120                         LOG_DEBUG("Add hardware watchpoint %" PRId32 " at %08" TARGET_PRIxADDR " mask %08" PRIx32,
 121                                         wp_num, wp->address, wp->mask);
 122
 123                         wp_num++;
 124                 } else if (nds32_v3->nds32.global_stop) {
 125                         if (wp->rw == WPT_READ)
 126                                 ld_stop = true;
 127                         else if (wp->rw == WPT_WRITE)
 128                                 st_stop = true;
 129                         else if (wp->rw == WPT_ACCESS)
 130                                 ld_stop = st_stop = true;
 131                 }
 132         }
 133
 134         if (nds32_v3->nds32.global_stop) {
 135                 uint32_t edm_ctl;
 136                 aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CTL, &edm_ctl);
 137                 if (ld_stop)
 138                         edm_ctl |= 0x10;
 139                 if (st_stop)
 140                         edm_ctl |= 0x20;
 141                 aice_write_debug_reg(aice, NDS_EDM_SR_EDM_CTL, edm_ctl);
 142         }
 143
 144         return ERROR_OK;
 145 }
 146
 147 static int nds32_v3_deactivate_hardware_watchpoint(struct target *target)
 148 {
 149         struct aice_port_s *aice = target_to_aice(target);
 150         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 151         int32_t wp_num = 0;
 152         struct watchpoint *wp;
 153         bool clean_global_stop = false;
 154
 155         for (wp = target->watchpoints; wp; wp = wp->next) {
 156
 157                 if (wp_num < nds32_v3->used_n_wp) {
 158                         /* disable watchpoint */
 159                         aice_write_debug_reg(aice, NDS_EDM_SR_BPC0 + wp_num, 0x0);
 160
 161                         LOG_DEBUG("Remove hardware watchpoint %" PRId32 " at %08" TARGET_PRIxADDR
 162                                         " mask %08" PRIx32, wp_num,
 163                                         wp->address, wp->mask);
 164                         wp_num++;
 165                 } else if (nds32_v3->nds32.global_stop) {
 166                         clean_global_stop = true;
 167                 }
 168         }
 169
 170         if (clean_global_stop) {
 171                 uint32_t edm_ctl;
 172                 aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CTL, &edm_ctl);
 173                 edm_ctl = edm_ctl & (~0x30);
 174                 aice_write_debug_reg(aice, NDS_EDM_SR_EDM_CTL, edm_ctl);
 175         }
 176
 177         return ERROR_OK;
 178 }
 179
 180 static int nds32_v3_check_interrupt_stack(struct nds32 *nds32)
 181 {
 182         uint32_t val_ir0;
 183         uint32_t value;
 184
 185         /* Save interrupt level */
 186         nds32_get_mapped_reg(nds32, IR0, &val_ir0);
 187         nds32->current_interrupt_level = (val_ir0 >> 1) & 0x3;
 188
 189         if (nds32_reach_max_interrupt_level(nds32))
 190                 LOG_ERROR("<-- TARGET ERROR! Reaching the max interrupt stack level %" PRIu32 ". -->",
 191                                 nds32->current_interrupt_level);
 192
 193         /* backup $ir4 & $ir6 to avoid suppressed exception overwrite */
 194         nds32_get_mapped_reg(nds32, IR4, &value);
 195         nds32_get_mapped_reg(nds32, IR6, &value);
 196
 197         return ERROR_OK;
 198 }
 199
 200 static int nds32_v3_restore_interrupt_stack(struct nds32 *nds32)
 201 {
 202         uint32_t value;
 203
 204         /* get backup value from cache */
 205         /* then set back to make the register dirty */
 206         nds32_get_mapped_reg(nds32, IR0, &value);
 207         nds32_set_mapped_reg(nds32, IR0, value);
 208
 209         nds32_get_mapped_reg(nds32, IR4, &value);
 210         nds32_set_mapped_reg(nds32, IR4, value);
 211
 212         nds32_get_mapped_reg(nds32, IR6, &value);
 213         nds32_set_mapped_reg(nds32, IR6, value);
 214
 215         return ERROR_OK;
 216 }
 217
 218 static int nds32_v3_deassert_reset(struct target *target)
 219 {
 220         int retval;
 221         struct aice_port_s *aice = target_to_aice(target);
 222         bool switch_to_v3_stack = false;
 223         uint32_t value_edm_ctl;
 224
 225         aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CTL, &value_edm_ctl);
 226         if (((value_edm_ctl >> 6) & 0x1) == 0) { /* reset to V2 EDM mode */
 227                 aice_write_debug_reg(aice, NDS_EDM_SR_EDM_CTL, value_edm_ctl | (0x1 << 6));
 228                 aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CTL, &value_edm_ctl);
 229                 if (((value_edm_ctl >> 6) & 0x1) == 1)
 230                         switch_to_v3_stack = true;
 231         } else
 232                 switch_to_v3_stack = false;
 233
 234         CHECK_RETVAL(nds32_poll(target));
 235
 236         if (target->state != TARGET_HALTED) {
 237                 /* reset only */
 238                 LOG_WARNING("%s: ran after reset and before halt ...",
 239                                 target_name(target));
 240                 retval = target_halt(target);
 241                 if (retval != ERROR_OK)
 242                         return retval;
 243
 244         } else {
 245                 /* reset-halt */
 246                 struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 247                 struct nds32 *nds32 = &(nds32_v3->nds32);
 248                 uint32_t value;
 249                 uint32_t interrupt_level;
 250
 251                 if (switch_to_v3_stack == true) {
 252                         /* PSW.INTL-- */
 253                         nds32_get_mapped_reg(nds32, IR0, &value);
 254                         interrupt_level = (value >> 1) & 0x3;
 255                         interrupt_level--;
 256                         value &= ~(0x6);
 257                         value |= (interrupt_level << 1);
 258                         value |= 0x400;  /* set PSW.DEX */
 259                         nds32_set_mapped_reg(nds32, IR0, value);
 260
 261                         /* copy IPC to OIPC */
 262                         if ((interrupt_level + 1) < nds32->max_interrupt_level) {
 263                                 nds32_get_mapped_reg(nds32, IR9, &value);
 264                                 nds32_set_mapped_reg(nds32, IR11, value);
 265                         }
 266                 }
 267         }
 268
 269         return ERROR_OK;
 270 }
 271
 272 static int nds32_v3_add_breakpoint(struct target *target,
 273                 struct breakpoint *breakpoint)
 274 {
 275         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 276         struct nds32 *nds32 = &(nds32_v3->nds32);
 277         int result;
 278
 279         if (breakpoint->type == BKPT_HARD) {
 280                 /* check hardware resource */
 281                 if (nds32_v3->n_hbr <= nds32_v3->next_hbr_index) {
 282                         LOG_WARNING("<-- TARGET WARNING! Insert too many "
 283                                         "hardware breakpoints/watchpoints! "
 284                                         "The limit of combined hardware "
 285                                         "breakpoints/watchpoints is %" PRId32 ". -->",
 286                                         nds32_v3->n_hbr);
 287                         LOG_WARNING("<-- TARGET STATUS: Inserted number of "
 288                                         "hardware breakpoint: %" PRId32 ", hardware "
 289                                         "watchpoints: %" PRId32 ". -->",
 290                                         nds32_v3->next_hbr_index - nds32_v3->used_n_wp,
 291                                         nds32_v3->used_n_wp);
 292                         return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 293                 }
 294
 295                 /* update next place to put hardware breakpoint */
 296                 nds32_v3->next_hbr_index++;
 297
 298                 /* hardware breakpoint insertion occurs before 'continue' actually */
 299                 return ERROR_OK;
 300         } else if (breakpoint->type == BKPT_SOFT) {
 301                 result = nds32_add_software_breakpoint(target, breakpoint);
 302                 if (result != ERROR_OK) {
 303                         /* auto convert to hardware breakpoint if failed */
 304                         if (nds32->auto_convert_hw_bp) {
 305                                 /* convert to hardware breakpoint */
 306                                 breakpoint->type = BKPT_HARD;
 307
 308                                 return nds32_v3_add_breakpoint(target, breakpoint);
 309                         }
 310                 }
 311
 312                 return result;
 313         } else /* unrecognized breakpoint type */
 314                 return ERROR_FAIL;
 315
 316         return ERROR_OK;
 317 }
 318
 319 static int nds32_v3_remove_breakpoint(struct target *target,
 320                 struct breakpoint *breakpoint)
 321 {
 322         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 323
 324         if (breakpoint->type == BKPT_HARD) {
 325                 if (nds32_v3->next_hbr_index <= 0)
 326                         return ERROR_FAIL;
 327
 328                 /* update next place to put hardware breakpoint */
 329                 nds32_v3->next_hbr_index--;
 330
 331                 /* hardware breakpoint removal occurs after 'halted' actually */
 332                 return ERROR_OK;
 333         } else if (breakpoint->type == BKPT_SOFT) {
 334                 return nds32_remove_software_breakpoint(target, breakpoint);
 335         } else /* unrecognized breakpoint type */
 336                 return ERROR_FAIL;
 337
 338         return ERROR_OK;
 339 }
 340
 341 static int nds32_v3_add_watchpoint(struct target *target,
 342                 struct watchpoint *watchpoint)
 343 {
 344         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 345
 346         /* check hardware resource */
 347         if (nds32_v3->n_hbr <= nds32_v3->next_hbr_index) {
 348                 /* No hardware resource */
 349                 if (nds32_v3->nds32.global_stop) {
 350                         LOG_WARNING("<-- TARGET WARNING! The number of "
 351                                         "watchpoints exceeds the hardware "
 352                                         "resources. Stop at every load/store "
 353                                         "instruction to check for watchpoint matches. -->");
 354                         return ERROR_OK;
 355                 }
 356
 357                 LOG_WARNING("<-- TARGET WARNING! Insert too many hardware "
 358                                 "breakpoints/watchpoints! The limit of combined "
 359                                 "hardware breakpoints/watchpoints is %" PRId32 ". -->",
 360                                 nds32_v3->n_hbr);
 361                 LOG_WARNING("<-- TARGET STATUS: Inserted number of "
 362                                 "hardware breakpoint: %" PRId32 ", hardware "
 363                                 "watchpoints: %" PRId32 ". -->",
 364                                 nds32_v3->next_hbr_index - nds32_v3->used_n_wp,
 365                                 nds32_v3->used_n_wp);
 366
 367                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 368         }
 369
 370         /* update next place to put hardware watchpoint */
 371         nds32_v3->next_hbr_index++;
 372         nds32_v3->used_n_wp++;
 373
 374         return ERROR_OK;
 375 }
 376
 377 static int nds32_v3_remove_watchpoint(struct target *target,
 378                 struct watchpoint *watchpoint)
 379 {
 380         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 381
 382         if (nds32_v3->next_hbr_index <= 0) {
 383                 if (nds32_v3->nds32.global_stop)
 384                         return ERROR_OK;
 385
 386                 return ERROR_FAIL;
 387         }
 388
 389         /* update next place to put hardware breakpoint */
 390         nds32_v3->next_hbr_index--;
 391         nds32_v3->used_n_wp--;
 392
 393         return ERROR_OK;
 394 }
 395
 396 static struct nds32_v3_common_callback nds32_v3_common_callback = {
 397         .check_interrupt_stack = nds32_v3_check_interrupt_stack,
 398         .restore_interrupt_stack = nds32_v3_restore_interrupt_stack,
 399         .activate_hardware_breakpoint = nds32_v3_activate_hardware_breakpoint,
 400         .activate_hardware_watchpoint = nds32_v3_activate_hardware_watchpoint,
 401         .deactivate_hardware_breakpoint = nds32_v3_deactivate_hardware_breakpoint,
 402         .deactivate_hardware_watchpoint = nds32_v3_deactivate_hardware_watchpoint,
 403 };
 404
 405 static int nds32_v3_target_create(struct target *target, Jim_Interp *interp)
 406 {
 407         struct nds32_v3_common *nds32_v3;
 408
 409         nds32_v3 = calloc(1, sizeof(*nds32_v3));
 410         if (!nds32_v3)
 411                 return ERROR_FAIL;
 412
 413         nds32_v3_common_register_callback(&nds32_v3_common_callback);
 414         nds32_v3_target_create_common(target, &(nds32_v3->nds32));
 415
 416         return ERROR_OK;
 417 }
 418
 419 /* talk to the target and set things up */
 420 static int nds32_v3_examine(struct target *target)
 421 {
 422         struct nds32_v3_common *nds32_v3 = target_to_nds32_v3(target);
 423         struct nds32 *nds32 = &(nds32_v3->nds32);
 424         struct aice_port_s *aice = target_to_aice(target);
 425
 426         if (!target_was_examined(target)) {
 427                 CHECK_RETVAL(nds32_edm_config(nds32));
 428
 429                 if (nds32->reset_halt_as_examine)
 430                         CHECK_RETVAL(nds32_reset_halt(nds32));
 431         }
 432
 433         uint32_t edm_cfg;
 434         aice_read_debug_reg(aice, NDS_EDM_SR_EDM_CFG, &edm_cfg);
 435
 436         /* get the number of hardware breakpoints */
 437         nds32_v3->n_hbr = (edm_cfg & 0x7) + 1;
 438
 439         /* low interference profiling */
 440         if (edm_cfg & 0x100)
 441                 nds32_v3->low_interference_profile = true;
 442         else
 443                 nds32_v3->low_interference_profile = false;
 444
 445         nds32_v3->next_hbr_index = 0;
 446         nds32_v3->used_n_wp = 0;
 447
 448         LOG_INFO("%s: total hardware breakpoint %" PRId32, target_name(target),
 449                         nds32_v3->n_hbr);
 450
 451         nds32->target->state = TARGET_RUNNING;
 452         nds32->target->debug_reason = DBG_REASON_NOTHALTED;
 453
 454         target_set_examined(target);
 455
 456         return ERROR_OK;
 457 }
 458
 459 /** Holds methods for Andes1337 targets. */
 460 struct target_type nds32_v3_target = {
 461         .name = "nds32_v3",
 462
 463         .poll = nds32_poll,
 464         .arch_state = nds32_arch_state,
 465
 466         .target_request_data = nds32_v3_target_request_data,
 467
 468         .halt = nds32_halt,
 469         .resume = nds32_resume,
 470         .step = nds32_step,
 471
 472         .assert_reset = nds32_assert_reset,
 473         .deassert_reset = nds32_v3_deassert_reset,
 474
 475         /* register access */
 476         .get_gdb_reg_list = nds32_get_gdb_reg_list,
 477
 478         /* memory access */
 479         .read_buffer = nds32_v3_read_buffer,
 480         .write_buffer = nds32_v3_write_buffer,
 481         .read_memory = nds32_v3_read_memory,
 482         .write_memory = nds32_v3_write_memory,
 483
 484         .checksum_memory = nds32_v3_checksum_memory,
 485
 486         /* breakpoint/watchpoint */
 487         .add_breakpoint = nds32_v3_add_breakpoint,
 488         .remove_breakpoint = nds32_v3_remove_breakpoint,
 489         .add_watchpoint = nds32_v3_add_watchpoint,
 490         .remove_watchpoint = nds32_v3_remove_watchpoint,
 491         .hit_watchpoint = nds32_v3_hit_watchpoint,
 492
 493         /* MMU */
 494         .mmu = nds32_mmu,
 495         .virt2phys = nds32_virtual_to_physical,
 496         .read_phys_memory = nds32_read_phys_memory,
 497         .write_phys_memory = nds32_write_phys_memory,
 498
 499         .run_algorithm = nds32_v3_run_algorithm,
 500
 501         .commands = nds32_command_handlers,
 502         .target_create = nds32_v3_target_create,
 503         .init_target = nds32_v3_init_target,
 504         .examine = nds32_v3_examine,
 505
 506         .get_gdb_fileio_info = nds32_get_gdb_fileio_info,
 507         .gdb_fileio_end = nds32_gdb_fileio_end,
 508
 509         .profiling = nds32_profiling,
 510 };