1 /* 2 * QEMU RISC-V Native Debug Support 3 * 4 * Copyright (c) 2022 Wind River Systems, Inc. 5 * 6 * Author: 7 * Bin Meng <bin.meng@windriver.com> 8 * 9 * This provides the native debug support via the Trigger Module, as defined 10 * in the RISC-V Debug Specification: 11 * https://github.com/riscv/riscv-debug-spec/raw/master/riscv-debug-stable.pdf 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms and conditions of the GNU General Public License, 15 * version 2 or later, as published by the Free Software Foundation. 16 * 17 * This program is distributed in the hope it will be useful, but WITHOUT 18 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 19 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 20 * more details. 21 * 22 * You should have received a copy of the GNU General Public License along with 23 * this program. If not, see <http://www.gnu.org/licenses/>. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu/log.h" 28 #include "qapi/error.h" 29 #include "cpu.h" 30 #include "trace.h" 31 #include "exec/exec-all.h" 32 #include "exec/helper-proto.h" 33 #include "sysemu/cpu-timers.h" 34 35 /* 36 * The following M-mode trigger CSRs are implemented: 37 * 38 * - tselect 39 * - tdata1 40 * - tdata2 41 * - tdata3 42 * - tinfo 43 * 44 * The following triggers are initialized by default: 45 * 46 * Index | Type | tdata mapping | Description 47 * ------+------+------------------------+------------ 48 * 0 | 2 | tdata1, tdata2 | Address / Data Match 49 * 1 | 2 | tdata1, tdata2 | Address / Data Match 50 */ 51 52 /* tdata availability of a trigger */ 53 typedef bool tdata_avail[TDATA_NUM]; 54 55 static tdata_avail tdata_mapping[TRIGGER_TYPE_NUM] = { 56 [TRIGGER_TYPE_NO_EXIST] = { false, false, false }, 57 [TRIGGER_TYPE_AD_MATCH] = { true, true, true }, 58 [TRIGGER_TYPE_INST_CNT] = { true, false, true }, 59 [TRIGGER_TYPE_INT] = { true, true, true }, 60 [TRIGGER_TYPE_EXCP] = { true, true, true }, 61 [TRIGGER_TYPE_AD_MATCH6] = { true, true, true }, 62 [TRIGGER_TYPE_EXT_SRC] = { true, false, false }, 63 [TRIGGER_TYPE_UNAVAIL] = { true, true, true } 64 }; 65 66 /* only breakpoint size 1/2/4/8 supported */ 67 static int access_size[SIZE_NUM] = { 68 [SIZE_ANY] = 0, 69 [SIZE_1B] = 1, 70 [SIZE_2B] = 2, 71 [SIZE_4B] = 4, 72 [SIZE_6B] = -1, 73 [SIZE_8B] = 8, 74 [6 ... 15] = -1, 75 }; 76 77 static inline target_ulong extract_trigger_type(CPURISCVState *env, 78 target_ulong tdata1) 79 { 80 switch (riscv_cpu_mxl(env)) { 81 case MXL_RV32: 82 return extract32(tdata1, 28, 4); 83 case MXL_RV64: 84 case MXL_RV128: 85 return extract64(tdata1, 60, 4); 86 default: 87 g_assert_not_reached(); 88 } 89 } 90 91 static inline target_ulong get_trigger_type(CPURISCVState *env, 92 target_ulong trigger_index) 93 { 94 return extract_trigger_type(env, env->tdata1[trigger_index]); 95 } 96 97 static trigger_action_t get_trigger_action(CPURISCVState *env, 98 target_ulong trigger_index) 99 { 100 target_ulong tdata1 = env->tdata1[trigger_index]; 101 int trigger_type = get_trigger_type(env, trigger_index); 102 trigger_action_t action = DBG_ACTION_NONE; 103 104 switch (trigger_type) { 105 case TRIGGER_TYPE_AD_MATCH: 106 action = (tdata1 & TYPE2_ACTION) >> 12; 107 break; 108 case TRIGGER_TYPE_AD_MATCH6: 109 action = (tdata1 & TYPE6_ACTION) >> 12; 110 break; 111 case TRIGGER_TYPE_INST_CNT: 112 case TRIGGER_TYPE_INT: 113 case TRIGGER_TYPE_EXCP: 114 case TRIGGER_TYPE_EXT_SRC: 115 qemu_log_mask(LOG_UNIMP, "trigger type: %d is not supported\n", 116 trigger_type); 117 break; 118 case TRIGGER_TYPE_NO_EXIST: 119 case TRIGGER_TYPE_UNAVAIL: 120 qemu_log_mask(LOG_GUEST_ERROR, "trigger type: %d does not exit\n", 121 trigger_type); 122 break; 123 default: 124 g_assert_not_reached(); 125 } 126 127 return action; 128 } 129 130 static inline target_ulong build_tdata1(CPURISCVState *env, 131 trigger_type_t type, 132 bool dmode, target_ulong data) 133 { 134 target_ulong tdata1; 135 136 switch (riscv_cpu_mxl(env)) { 137 case MXL_RV32: 138 tdata1 = RV32_TYPE(type) | 139 (dmode ? RV32_DMODE : 0) | 140 (data & RV32_DATA_MASK); 141 break; 142 case MXL_RV64: 143 case MXL_RV128: 144 tdata1 = RV64_TYPE(type) | 145 (dmode ? RV64_DMODE : 0) | 146 (data & RV64_DATA_MASK); 147 break; 148 default: 149 g_assert_not_reached(); 150 } 151 152 return tdata1; 153 } 154 155 bool tdata_available(CPURISCVState *env, int tdata_index) 156 { 157 int trigger_type = get_trigger_type(env, env->trigger_cur); 158 159 if (unlikely(tdata_index >= TDATA_NUM)) { 160 return false; 161 } 162 163 return tdata_mapping[trigger_type][tdata_index]; 164 } 165 166 target_ulong tselect_csr_read(CPURISCVState *env) 167 { 168 return env->trigger_cur; 169 } 170 171 void tselect_csr_write(CPURISCVState *env, target_ulong val) 172 { 173 if (val < RV_MAX_TRIGGERS) { 174 env->trigger_cur = val; 175 } 176 } 177 178 static target_ulong tdata1_validate(CPURISCVState *env, target_ulong val, 179 trigger_type_t t) 180 { 181 uint32_t type, dmode; 182 target_ulong tdata1; 183 184 switch (riscv_cpu_mxl(env)) { 185 case MXL_RV32: 186 type = extract32(val, 28, 4); 187 dmode = extract32(val, 27, 1); 188 tdata1 = RV32_TYPE(t); 189 break; 190 case MXL_RV64: 191 case MXL_RV128: 192 type = extract64(val, 60, 4); 193 dmode = extract64(val, 59, 1); 194 tdata1 = RV64_TYPE(t); 195 break; 196 default: 197 g_assert_not_reached(); 198 } 199 200 if (type != t) { 201 qemu_log_mask(LOG_GUEST_ERROR, 202 "ignoring type write to tdata1 register\n"); 203 } 204 205 if (dmode != 0) { 206 qemu_log_mask(LOG_UNIMP, "debug mode is not supported\n"); 207 } 208 209 return tdata1; 210 } 211 212 static inline void warn_always_zero_bit(target_ulong val, target_ulong mask, 213 const char *msg) 214 { 215 if (val & mask) { 216 qemu_log_mask(LOG_UNIMP, "%s bit is always zero\n", msg); 217 } 218 } 219 220 static void do_trigger_action(CPURISCVState *env, target_ulong trigger_index) 221 { 222 trigger_action_t action = get_trigger_action(env, trigger_index); 223 224 switch (action) { 225 case DBG_ACTION_NONE: 226 break; 227 case DBG_ACTION_BP: 228 riscv_raise_exception(env, RISCV_EXCP_BREAKPOINT, 0); 229 break; 230 case DBG_ACTION_DBG_MODE: 231 case DBG_ACTION_TRACE0: 232 case DBG_ACTION_TRACE1: 233 case DBG_ACTION_TRACE2: 234 case DBG_ACTION_TRACE3: 235 case DBG_ACTION_EXT_DBG0: 236 case DBG_ACTION_EXT_DBG1: 237 qemu_log_mask(LOG_UNIMP, "action: %d is not supported\n", action); 238 break; 239 default: 240 g_assert_not_reached(); 241 } 242 } 243 244 /* type 2 trigger */ 245 246 static uint32_t type2_breakpoint_size(CPURISCVState *env, target_ulong ctrl) 247 { 248 uint32_t sizelo, sizehi = 0; 249 250 if (riscv_cpu_mxl(env) == MXL_RV64) { 251 sizehi = extract32(ctrl, 21, 2); 252 } 253 sizelo = extract32(ctrl, 16, 2); 254 return (sizehi << 2) | sizelo; 255 } 256 257 static inline bool type2_breakpoint_enabled(target_ulong ctrl) 258 { 259 bool mode = !!(ctrl & (TYPE2_U | TYPE2_S | TYPE2_M)); 260 bool rwx = !!(ctrl & (TYPE2_LOAD | TYPE2_STORE | TYPE2_EXEC)); 261 262 return mode && rwx; 263 } 264 265 static target_ulong type2_mcontrol_validate(CPURISCVState *env, 266 target_ulong ctrl) 267 { 268 target_ulong val; 269 uint32_t size; 270 271 /* validate the generic part first */ 272 val = tdata1_validate(env, ctrl, TRIGGER_TYPE_AD_MATCH); 273 274 /* validate unimplemented (always zero) bits */ 275 warn_always_zero_bit(ctrl, TYPE2_MATCH, "match"); 276 warn_always_zero_bit(ctrl, TYPE2_CHAIN, "chain"); 277 warn_always_zero_bit(ctrl, TYPE2_ACTION, "action"); 278 warn_always_zero_bit(ctrl, TYPE2_TIMING, "timing"); 279 warn_always_zero_bit(ctrl, TYPE2_SELECT, "select"); 280 warn_always_zero_bit(ctrl, TYPE2_HIT, "hit"); 281 282 /* validate size encoding */ 283 size = type2_breakpoint_size(env, ctrl); 284 if (access_size[size] == -1) { 285 qemu_log_mask(LOG_UNIMP, "access size %d is not supported, using " 286 "SIZE_ANY\n", size); 287 } else { 288 val |= (ctrl & TYPE2_SIZELO); 289 if (riscv_cpu_mxl(env) == MXL_RV64) { 290 val |= (ctrl & TYPE2_SIZEHI); 291 } 292 } 293 294 /* keep the mode and attribute bits */ 295 val |= (ctrl & (TYPE2_U | TYPE2_S | TYPE2_M | 296 TYPE2_LOAD | TYPE2_STORE | TYPE2_EXEC)); 297 298 return val; 299 } 300 301 static void type2_breakpoint_insert(CPURISCVState *env, target_ulong index) 302 { 303 target_ulong ctrl = env->tdata1[index]; 304 target_ulong addr = env->tdata2[index]; 305 bool enabled = type2_breakpoint_enabled(ctrl); 306 CPUState *cs = env_cpu(env); 307 int flags = BP_CPU | BP_STOP_BEFORE_ACCESS; 308 uint32_t size; 309 310 if (!enabled) { 311 return; 312 } 313 314 if (ctrl & TYPE2_EXEC) { 315 cpu_breakpoint_insert(cs, addr, flags, &env->cpu_breakpoint[index]); 316 } 317 318 if (ctrl & TYPE2_LOAD) { 319 flags |= BP_MEM_READ; 320 } 321 if (ctrl & TYPE2_STORE) { 322 flags |= BP_MEM_WRITE; 323 } 324 325 if (flags & BP_MEM_ACCESS) { 326 size = type2_breakpoint_size(env, ctrl); 327 if (size != 0) { 328 cpu_watchpoint_insert(cs, addr, size, flags, 329 &env->cpu_watchpoint[index]); 330 } else { 331 cpu_watchpoint_insert(cs, addr, 8, flags, 332 &env->cpu_watchpoint[index]); 333 } 334 } 335 } 336 337 static void type2_breakpoint_remove(CPURISCVState *env, target_ulong index) 338 { 339 CPUState *cs = env_cpu(env); 340 341 if (env->cpu_breakpoint[index]) { 342 cpu_breakpoint_remove_by_ref(cs, env->cpu_breakpoint[index]); 343 env->cpu_breakpoint[index] = NULL; 344 } 345 346 if (env->cpu_watchpoint[index]) { 347 cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[index]); 348 env->cpu_watchpoint[index] = NULL; 349 } 350 } 351 352 static void type2_reg_write(CPURISCVState *env, target_ulong index, 353 int tdata_index, target_ulong val) 354 { 355 target_ulong new_val; 356 357 switch (tdata_index) { 358 case TDATA1: 359 new_val = type2_mcontrol_validate(env, val); 360 if (new_val != env->tdata1[index]) { 361 env->tdata1[index] = new_val; 362 type2_breakpoint_remove(env, index); 363 type2_breakpoint_insert(env, index); 364 } 365 break; 366 case TDATA2: 367 if (val != env->tdata2[index]) { 368 env->tdata2[index] = val; 369 type2_breakpoint_remove(env, index); 370 type2_breakpoint_insert(env, index); 371 } 372 break; 373 case TDATA3: 374 qemu_log_mask(LOG_UNIMP, 375 "tdata3 is not supported for type 2 trigger\n"); 376 break; 377 default: 378 g_assert_not_reached(); 379 } 380 381 return; 382 } 383 384 /* type 6 trigger */ 385 386 static inline bool type6_breakpoint_enabled(target_ulong ctrl) 387 { 388 bool mode = !!(ctrl & (TYPE6_VU | TYPE6_VS | TYPE6_U | TYPE6_S | TYPE6_M)); 389 bool rwx = !!(ctrl & (TYPE6_LOAD | TYPE6_STORE | TYPE6_EXEC)); 390 391 return mode && rwx; 392 } 393 394 static target_ulong type6_mcontrol6_validate(CPURISCVState *env, 395 target_ulong ctrl) 396 { 397 target_ulong val; 398 uint32_t size; 399 400 /* validate the generic part first */ 401 val = tdata1_validate(env, ctrl, TRIGGER_TYPE_AD_MATCH6); 402 403 /* validate unimplemented (always zero) bits */ 404 warn_always_zero_bit(ctrl, TYPE6_MATCH, "match"); 405 warn_always_zero_bit(ctrl, TYPE6_CHAIN, "chain"); 406 warn_always_zero_bit(ctrl, TYPE6_ACTION, "action"); 407 warn_always_zero_bit(ctrl, TYPE6_TIMING, "timing"); 408 warn_always_zero_bit(ctrl, TYPE6_SELECT, "select"); 409 warn_always_zero_bit(ctrl, TYPE6_HIT, "hit"); 410 411 /* validate size encoding */ 412 size = extract32(ctrl, 16, 4); 413 if (access_size[size] == -1) { 414 qemu_log_mask(LOG_UNIMP, "access size %d is not supported, using " 415 "SIZE_ANY\n", size); 416 } else { 417 val |= (ctrl & TYPE6_SIZE); 418 } 419 420 /* keep the mode and attribute bits */ 421 val |= (ctrl & (TYPE6_VU | TYPE6_VS | TYPE6_U | TYPE6_S | TYPE6_M | 422 TYPE6_LOAD | TYPE6_STORE | TYPE6_EXEC)); 423 424 return val; 425 } 426 427 static void type6_breakpoint_insert(CPURISCVState *env, target_ulong index) 428 { 429 target_ulong ctrl = env->tdata1[index]; 430 target_ulong addr = env->tdata2[index]; 431 bool enabled = type6_breakpoint_enabled(ctrl); 432 CPUState *cs = env_cpu(env); 433 int flags = BP_CPU | BP_STOP_BEFORE_ACCESS; 434 uint32_t size; 435 436 if (!enabled) { 437 return; 438 } 439 440 if (ctrl & TYPE6_EXEC) { 441 cpu_breakpoint_insert(cs, addr, flags, &env->cpu_breakpoint[index]); 442 } 443 444 if (ctrl & TYPE6_LOAD) { 445 flags |= BP_MEM_READ; 446 } 447 448 if (ctrl & TYPE6_STORE) { 449 flags |= BP_MEM_WRITE; 450 } 451 452 if (flags & BP_MEM_ACCESS) { 453 size = extract32(ctrl, 16, 4); 454 if (size != 0) { 455 cpu_watchpoint_insert(cs, addr, size, flags, 456 &env->cpu_watchpoint[index]); 457 } else { 458 cpu_watchpoint_insert(cs, addr, 8, flags, 459 &env->cpu_watchpoint[index]); 460 } 461 } 462 } 463 464 static void type6_breakpoint_remove(CPURISCVState *env, target_ulong index) 465 { 466 type2_breakpoint_remove(env, index); 467 } 468 469 static void type6_reg_write(CPURISCVState *env, target_ulong index, 470 int tdata_index, target_ulong val) 471 { 472 target_ulong new_val; 473 474 switch (tdata_index) { 475 case TDATA1: 476 new_val = type6_mcontrol6_validate(env, val); 477 if (new_val != env->tdata1[index]) { 478 env->tdata1[index] = new_val; 479 type6_breakpoint_remove(env, index); 480 type6_breakpoint_insert(env, index); 481 } 482 break; 483 case TDATA2: 484 if (val != env->tdata2[index]) { 485 env->tdata2[index] = val; 486 type6_breakpoint_remove(env, index); 487 type6_breakpoint_insert(env, index); 488 } 489 break; 490 case TDATA3: 491 qemu_log_mask(LOG_UNIMP, 492 "tdata3 is not supported for type 6 trigger\n"); 493 break; 494 default: 495 g_assert_not_reached(); 496 } 497 498 return; 499 } 500 501 /* icount trigger type */ 502 static inline int 503 itrigger_get_count(CPURISCVState *env, int index) 504 { 505 return get_field(env->tdata1[index], ITRIGGER_COUNT); 506 } 507 508 static inline void 509 itrigger_set_count(CPURISCVState *env, int index, int value) 510 { 511 env->tdata1[index] = set_field(env->tdata1[index], 512 ITRIGGER_COUNT, value); 513 } 514 515 static bool check_itrigger_priv(CPURISCVState *env, int index) 516 { 517 target_ulong tdata1 = env->tdata1[index]; 518 if (env->virt_enabled) { 519 /* check VU/VS bit against current privilege level */ 520 return (get_field(tdata1, ITRIGGER_VS) == env->priv) || 521 (get_field(tdata1, ITRIGGER_VU) == env->priv); 522 } else { 523 /* check U/S/M bit against current privilege level */ 524 return (get_field(tdata1, ITRIGGER_M) == env->priv) || 525 (get_field(tdata1, ITRIGGER_S) == env->priv) || 526 (get_field(tdata1, ITRIGGER_U) == env->priv); 527 } 528 } 529 530 bool riscv_itrigger_enabled(CPURISCVState *env) 531 { 532 int count; 533 for (int i = 0; i < RV_MAX_TRIGGERS; i++) { 534 if (get_trigger_type(env, i) != TRIGGER_TYPE_INST_CNT) { 535 continue; 536 } 537 if (check_itrigger_priv(env, i)) { 538 continue; 539 } 540 count = itrigger_get_count(env, i); 541 if (!count) { 542 continue; 543 } 544 return true; 545 } 546 547 return false; 548 } 549 550 void helper_itrigger_match(CPURISCVState *env) 551 { 552 int count; 553 for (int i = 0; i < RV_MAX_TRIGGERS; i++) { 554 if (get_trigger_type(env, i) != TRIGGER_TYPE_INST_CNT) { 555 continue; 556 } 557 if (check_itrigger_priv(env, i)) { 558 continue; 559 } 560 count = itrigger_get_count(env, i); 561 if (!count) { 562 continue; 563 } 564 itrigger_set_count(env, i, count--); 565 if (!count) { 566 env->itrigger_enabled = riscv_itrigger_enabled(env); 567 do_trigger_action(env, i); 568 } 569 } 570 } 571 572 static void riscv_itrigger_update_count(CPURISCVState *env) 573 { 574 int count, executed; 575 /* 576 * Record last icount, so that we can evaluate the executed instructions 577 * since last privilege mode change or timer expire. 578 */ 579 int64_t last_icount = env->last_icount, current_icount; 580 current_icount = env->last_icount = icount_get_raw(); 581 582 for (int i = 0; i < RV_MAX_TRIGGERS; i++) { 583 if (get_trigger_type(env, i) != TRIGGER_TYPE_INST_CNT) { 584 continue; 585 } 586 count = itrigger_get_count(env, i); 587 if (!count) { 588 continue; 589 } 590 /* 591 * Only when privilege is changed or itrigger timer expires, 592 * the count field in itrigger tdata1 register is updated. 593 * And the count field in itrigger only contains remaining value. 594 */ 595 if (check_itrigger_priv(env, i)) { 596 /* 597 * If itrigger enabled in this privilege mode, the number of 598 * executed instructions since last privilege change 599 * should be reduced from current itrigger count. 600 */ 601 executed = current_icount - last_icount; 602 itrigger_set_count(env, i, count - executed); 603 if (count == executed) { 604 do_trigger_action(env, i); 605 } 606 } else { 607 /* 608 * If itrigger is not enabled in this privilege mode, 609 * the number of executed instructions will be discard and 610 * the count field in itrigger will not change. 611 */ 612 timer_mod(env->itrigger_timer[i], 613 current_icount + count); 614 } 615 } 616 } 617 618 static void riscv_itrigger_timer_cb(void *opaque) 619 { 620 riscv_itrigger_update_count((CPURISCVState *)opaque); 621 } 622 623 void riscv_itrigger_update_priv(CPURISCVState *env) 624 { 625 riscv_itrigger_update_count(env); 626 } 627 628 static target_ulong itrigger_validate(CPURISCVState *env, 629 target_ulong ctrl) 630 { 631 target_ulong val; 632 633 /* validate the generic part first */ 634 val = tdata1_validate(env, ctrl, TRIGGER_TYPE_INST_CNT); 635 636 /* validate unimplemented (always zero) bits */ 637 warn_always_zero_bit(ctrl, ITRIGGER_ACTION, "action"); 638 warn_always_zero_bit(ctrl, ITRIGGER_HIT, "hit"); 639 warn_always_zero_bit(ctrl, ITRIGGER_PENDING, "pending"); 640 641 /* keep the mode and attribute bits */ 642 val |= ctrl & (ITRIGGER_VU | ITRIGGER_VS | ITRIGGER_U | ITRIGGER_S | 643 ITRIGGER_M | ITRIGGER_COUNT); 644 645 return val; 646 } 647 648 static void itrigger_reg_write(CPURISCVState *env, target_ulong index, 649 int tdata_index, target_ulong val) 650 { 651 target_ulong new_val; 652 653 switch (tdata_index) { 654 case TDATA1: 655 /* set timer for icount */ 656 new_val = itrigger_validate(env, val); 657 if (new_val != env->tdata1[index]) { 658 env->tdata1[index] = new_val; 659 if (icount_enabled()) { 660 env->last_icount = icount_get_raw(); 661 /* set the count to timer */ 662 timer_mod(env->itrigger_timer[index], 663 env->last_icount + itrigger_get_count(env, index)); 664 } else { 665 env->itrigger_enabled = riscv_itrigger_enabled(env); 666 } 667 } 668 break; 669 case TDATA2: 670 qemu_log_mask(LOG_UNIMP, 671 "tdata2 is not supported for icount trigger\n"); 672 break; 673 case TDATA3: 674 qemu_log_mask(LOG_UNIMP, 675 "tdata3 is not supported for icount trigger\n"); 676 break; 677 default: 678 g_assert_not_reached(); 679 } 680 681 return; 682 } 683 684 static int itrigger_get_adjust_count(CPURISCVState *env) 685 { 686 int count = itrigger_get_count(env, env->trigger_cur), executed; 687 if ((count != 0) && check_itrigger_priv(env, env->trigger_cur)) { 688 executed = icount_get_raw() - env->last_icount; 689 count += executed; 690 } 691 return count; 692 } 693 694 target_ulong tdata_csr_read(CPURISCVState *env, int tdata_index) 695 { 696 int trigger_type; 697 switch (tdata_index) { 698 case TDATA1: 699 trigger_type = extract_trigger_type(env, 700 env->tdata1[env->trigger_cur]); 701 if ((trigger_type == TRIGGER_TYPE_INST_CNT) && icount_enabled()) { 702 return deposit64(env->tdata1[env->trigger_cur], 10, 14, 703 itrigger_get_adjust_count(env)); 704 } 705 return env->tdata1[env->trigger_cur]; 706 case TDATA2: 707 return env->tdata2[env->trigger_cur]; 708 case TDATA3: 709 return env->tdata3[env->trigger_cur]; 710 default: 711 g_assert_not_reached(); 712 } 713 } 714 715 void tdata_csr_write(CPURISCVState *env, int tdata_index, target_ulong val) 716 { 717 int trigger_type; 718 719 if (tdata_index == TDATA1) { 720 trigger_type = extract_trigger_type(env, val); 721 } else { 722 trigger_type = get_trigger_type(env, env->trigger_cur); 723 } 724 725 switch (trigger_type) { 726 case TRIGGER_TYPE_AD_MATCH: 727 type2_reg_write(env, env->trigger_cur, tdata_index, val); 728 break; 729 case TRIGGER_TYPE_AD_MATCH6: 730 type6_reg_write(env, env->trigger_cur, tdata_index, val); 731 break; 732 case TRIGGER_TYPE_INST_CNT: 733 itrigger_reg_write(env, env->trigger_cur, tdata_index, val); 734 break; 735 case TRIGGER_TYPE_INT: 736 case TRIGGER_TYPE_EXCP: 737 case TRIGGER_TYPE_EXT_SRC: 738 qemu_log_mask(LOG_UNIMP, "trigger type: %d is not supported\n", 739 trigger_type); 740 break; 741 case TRIGGER_TYPE_NO_EXIST: 742 case TRIGGER_TYPE_UNAVAIL: 743 qemu_log_mask(LOG_GUEST_ERROR, "trigger type: %d does not exit\n", 744 trigger_type); 745 break; 746 default: 747 g_assert_not_reached(); 748 } 749 } 750 751 target_ulong tinfo_csr_read(CPURISCVState *env) 752 { 753 /* assume all triggers support the same types of triggers */ 754 return BIT(TRIGGER_TYPE_AD_MATCH) | 755 BIT(TRIGGER_TYPE_AD_MATCH6); 756 } 757 758 void riscv_cpu_debug_excp_handler(CPUState *cs) 759 { 760 RISCVCPU *cpu = RISCV_CPU(cs); 761 CPURISCVState *env = &cpu->env; 762 763 if (cs->watchpoint_hit) { 764 if (cs->watchpoint_hit->flags & BP_CPU) { 765 do_trigger_action(env, DBG_ACTION_BP); 766 } 767 } else { 768 if (cpu_breakpoint_test(cs, env->pc, BP_CPU)) { 769 do_trigger_action(env, DBG_ACTION_BP); 770 } 771 } 772 } 773 774 bool riscv_cpu_debug_check_breakpoint(CPUState *cs) 775 { 776 RISCVCPU *cpu = RISCV_CPU(cs); 777 CPURISCVState *env = &cpu->env; 778 CPUBreakpoint *bp; 779 target_ulong ctrl; 780 target_ulong pc; 781 int trigger_type; 782 int i; 783 784 QTAILQ_FOREACH(bp, &cs->breakpoints, entry) { 785 for (i = 0; i < RV_MAX_TRIGGERS; i++) { 786 trigger_type = get_trigger_type(env, i); 787 788 switch (trigger_type) { 789 case TRIGGER_TYPE_AD_MATCH: 790 /* type 2 trigger cannot be fired in VU/VS mode */ 791 if (env->virt_enabled) { 792 return false; 793 } 794 795 ctrl = env->tdata1[i]; 796 pc = env->tdata2[i]; 797 798 if ((ctrl & TYPE2_EXEC) && (bp->pc == pc)) { 799 /* check U/S/M bit against current privilege level */ 800 if ((ctrl >> 3) & BIT(env->priv)) { 801 return true; 802 } 803 } 804 break; 805 case TRIGGER_TYPE_AD_MATCH6: 806 ctrl = env->tdata1[i]; 807 pc = env->tdata2[i]; 808 809 if ((ctrl & TYPE6_EXEC) && (bp->pc == pc)) { 810 if (env->virt_enabled) { 811 /* check VU/VS bit against current privilege level */ 812 if ((ctrl >> 23) & BIT(env->priv)) { 813 return true; 814 } 815 } else { 816 /* check U/S/M bit against current privilege level */ 817 if ((ctrl >> 3) & BIT(env->priv)) { 818 return true; 819 } 820 } 821 } 822 break; 823 default: 824 /* other trigger types are not supported or irrelevant */ 825 break; 826 } 827 } 828 } 829 830 return false; 831 } 832 833 bool riscv_cpu_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp) 834 { 835 RISCVCPU *cpu = RISCV_CPU(cs); 836 CPURISCVState *env = &cpu->env; 837 target_ulong ctrl; 838 target_ulong addr; 839 int trigger_type; 840 int flags; 841 int i; 842 843 for (i = 0; i < RV_MAX_TRIGGERS; i++) { 844 trigger_type = get_trigger_type(env, i); 845 846 switch (trigger_type) { 847 case TRIGGER_TYPE_AD_MATCH: 848 /* type 2 trigger cannot be fired in VU/VS mode */ 849 if (env->virt_enabled) { 850 return false; 851 } 852 853 ctrl = env->tdata1[i]; 854 addr = env->tdata2[i]; 855 flags = 0; 856 857 if (ctrl & TYPE2_LOAD) { 858 flags |= BP_MEM_READ; 859 } 860 if (ctrl & TYPE2_STORE) { 861 flags |= BP_MEM_WRITE; 862 } 863 864 if ((wp->flags & flags) && (wp->vaddr == addr)) { 865 /* check U/S/M bit against current privilege level */ 866 if ((ctrl >> 3) & BIT(env->priv)) { 867 return true; 868 } 869 } 870 break; 871 case TRIGGER_TYPE_AD_MATCH6: 872 ctrl = env->tdata1[i]; 873 addr = env->tdata2[i]; 874 flags = 0; 875 876 if (ctrl & TYPE6_LOAD) { 877 flags |= BP_MEM_READ; 878 } 879 if (ctrl & TYPE6_STORE) { 880 flags |= BP_MEM_WRITE; 881 } 882 883 if ((wp->flags & flags) && (wp->vaddr == addr)) { 884 if (env->virt_enabled) { 885 /* check VU/VS bit against current privilege level */ 886 if ((ctrl >> 23) & BIT(env->priv)) { 887 return true; 888 } 889 } else { 890 /* check U/S/M bit against current privilege level */ 891 if ((ctrl >> 3) & BIT(env->priv)) { 892 return true; 893 } 894 } 895 } 896 break; 897 default: 898 /* other trigger types are not supported */ 899 break; 900 } 901 } 902 903 return false; 904 } 905 906 void riscv_trigger_realize(CPURISCVState *env) 907 { 908 int i; 909 910 for (i = 0; i < RV_MAX_TRIGGERS; i++) { 911 env->itrigger_timer[i] = timer_new_ns(QEMU_CLOCK_VIRTUAL, 912 riscv_itrigger_timer_cb, env); 913 } 914 } 915 916 void riscv_trigger_reset_hold(CPURISCVState *env) 917 { 918 target_ulong tdata1 = build_tdata1(env, TRIGGER_TYPE_AD_MATCH, 0, 0); 919 int i; 920 921 /* init to type 2 triggers */ 922 for (i = 0; i < RV_MAX_TRIGGERS; i++) { 923 /* 924 * type = TRIGGER_TYPE_AD_MATCH 925 * dmode = 0 (both debug and M-mode can write tdata) 926 * maskmax = 0 (unimplemented, always 0) 927 * sizehi = 0 (match against any size, RV64 only) 928 * hit = 0 (unimplemented, always 0) 929 * select = 0 (always 0, perform match on address) 930 * timing = 0 (always 0, trigger before instruction) 931 * sizelo = 0 (match against any size) 932 * action = 0 (always 0, raise a breakpoint exception) 933 * chain = 0 (unimplemented, always 0) 934 * match = 0 (always 0, when any compare value equals tdata2) 935 */ 936 env->tdata1[i] = tdata1; 937 env->tdata2[i] = 0; 938 env->tdata3[i] = 0; 939 env->cpu_breakpoint[i] = NULL; 940 env->cpu_watchpoint[i] = NULL; 941 timer_del(env->itrigger_timer[i]); 942 } 943 944 env->mcontext = 0; 945 } 946