1 /* 2 * gdb server stub 3 * 4 * This implements a subset of the remote protocol as described in: 5 * 6 * https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html 7 * 8 * Copyright (c) 2003-2005 Fabrice Bellard 9 * 10 * This library is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 22 * 23 * SPDX-License-Identifier: LGPL-2.0+ 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu/ctype.h" 28 #include "qemu/cutils.h" 29 #include "qemu/module.h" 30 #include "qemu/error-report.h" 31 #include "trace.h" 32 #include "exec/gdbstub.h" 33 #include "gdbstub/syscalls.h" 34 #ifdef CONFIG_USER_ONLY 35 #include "gdbstub/user.h" 36 #else 37 #include "hw/cpu/cluster.h" 38 #include "hw/boards.h" 39 #endif 40 41 #include "sysemu/hw_accel.h" 42 #include "sysemu/runstate.h" 43 #include "exec/replay-core.h" 44 #include "exec/hwaddr.h" 45 46 #include "internals.h" 47 48 typedef struct GDBRegisterState { 49 int base_reg; 50 int num_regs; 51 gdb_get_reg_cb get_reg; 52 gdb_set_reg_cb set_reg; 53 const char *xml; 54 struct GDBRegisterState *next; 55 } GDBRegisterState; 56 57 GDBState gdbserver_state; 58 59 void gdb_init_gdbserver_state(void) 60 { 61 g_assert(!gdbserver_state.init); 62 memset(&gdbserver_state, 0, sizeof(GDBState)); 63 gdbserver_state.init = true; 64 gdbserver_state.str_buf = g_string_new(NULL); 65 gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH); 66 gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4); 67 68 /* 69 * What single-step modes are supported is accelerator dependent. 70 * By default try to use no IRQs and no timers while single 71 * stepping so as to make single stepping like a typical ICE HW step. 72 */ 73 gdbserver_state.supported_sstep_flags = accel_supported_gdbstub_sstep_flags(); 74 gdbserver_state.sstep_flags = SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER; 75 gdbserver_state.sstep_flags &= gdbserver_state.supported_sstep_flags; 76 } 77 78 /* writes 2*len+1 bytes in buf */ 79 void gdb_memtohex(GString *buf, const uint8_t *mem, int len) 80 { 81 int i, c; 82 for(i = 0; i < len; i++) { 83 c = mem[i]; 84 g_string_append_c(buf, tohex(c >> 4)); 85 g_string_append_c(buf, tohex(c & 0xf)); 86 } 87 g_string_append_c(buf, '\0'); 88 } 89 90 void gdb_hextomem(GByteArray *mem, const char *buf, int len) 91 { 92 int i; 93 94 for(i = 0; i < len; i++) { 95 guint8 byte = fromhex(buf[0]) << 4 | fromhex(buf[1]); 96 g_byte_array_append(mem, &byte, 1); 97 buf += 2; 98 } 99 } 100 101 static void hexdump(const char *buf, int len, 102 void (*trace_fn)(size_t ofs, char const *text)) 103 { 104 char line_buffer[3 * 16 + 4 + 16 + 1]; 105 106 size_t i; 107 for (i = 0; i < len || (i & 0xF); ++i) { 108 size_t byte_ofs = i & 15; 109 110 if (byte_ofs == 0) { 111 memset(line_buffer, ' ', 3 * 16 + 4 + 16); 112 line_buffer[3 * 16 + 4 + 16] = 0; 113 } 114 115 size_t col_group = (i >> 2) & 3; 116 size_t hex_col = byte_ofs * 3 + col_group; 117 size_t txt_col = 3 * 16 + 4 + byte_ofs; 118 119 if (i < len) { 120 char value = buf[i]; 121 122 line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF); 123 line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF); 124 line_buffer[txt_col + 0] = (value >= ' ' && value < 127) 125 ? value 126 : '.'; 127 } 128 129 if (byte_ofs == 0xF) 130 trace_fn(i & -16, line_buffer); 131 } 132 } 133 134 /* return -1 if error, 0 if OK */ 135 int gdb_put_packet_binary(const char *buf, int len, bool dump) 136 { 137 int csum, i; 138 uint8_t footer[3]; 139 140 if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) { 141 hexdump(buf, len, trace_gdbstub_io_binaryreply); 142 } 143 144 for(;;) { 145 g_byte_array_set_size(gdbserver_state.last_packet, 0); 146 g_byte_array_append(gdbserver_state.last_packet, 147 (const uint8_t *) "$", 1); 148 g_byte_array_append(gdbserver_state.last_packet, 149 (const uint8_t *) buf, len); 150 csum = 0; 151 for(i = 0; i < len; i++) { 152 csum += buf[i]; 153 } 154 footer[0] = '#'; 155 footer[1] = tohex((csum >> 4) & 0xf); 156 footer[2] = tohex((csum) & 0xf); 157 g_byte_array_append(gdbserver_state.last_packet, footer, 3); 158 159 gdb_put_buffer(gdbserver_state.last_packet->data, 160 gdbserver_state.last_packet->len); 161 162 if (gdb_got_immediate_ack()) { 163 break; 164 } 165 } 166 return 0; 167 } 168 169 /* return -1 if error, 0 if OK */ 170 int gdb_put_packet(const char *buf) 171 { 172 trace_gdbstub_io_reply(buf); 173 174 return gdb_put_packet_binary(buf, strlen(buf), false); 175 } 176 177 void gdb_put_strbuf(void) 178 { 179 gdb_put_packet(gdbserver_state.str_buf->str); 180 } 181 182 /* Encode data using the encoding for 'x' packets. */ 183 void gdb_memtox(GString *buf, const char *mem, int len) 184 { 185 char c; 186 187 while (len--) { 188 c = *(mem++); 189 switch (c) { 190 case '#': case '$': case '*': case '}': 191 g_string_append_c(buf, '}'); 192 g_string_append_c(buf, c ^ 0x20); 193 break; 194 default: 195 g_string_append_c(buf, c); 196 break; 197 } 198 } 199 } 200 201 static uint32_t gdb_get_cpu_pid(CPUState *cpu) 202 { 203 #ifdef CONFIG_USER_ONLY 204 return getpid(); 205 #else 206 if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) { 207 /* Return the default process' PID */ 208 int index = gdbserver_state.process_num - 1; 209 return gdbserver_state.processes[index].pid; 210 } 211 return cpu->cluster_index + 1; 212 #endif 213 } 214 215 GDBProcess *gdb_get_process(uint32_t pid) 216 { 217 int i; 218 219 if (!pid) { 220 /* 0 means any process, we take the first one */ 221 return &gdbserver_state.processes[0]; 222 } 223 224 for (i = 0; i < gdbserver_state.process_num; i++) { 225 if (gdbserver_state.processes[i].pid == pid) { 226 return &gdbserver_state.processes[i]; 227 } 228 } 229 230 return NULL; 231 } 232 233 static GDBProcess *gdb_get_cpu_process(CPUState *cpu) 234 { 235 return gdb_get_process(gdb_get_cpu_pid(cpu)); 236 } 237 238 static CPUState *find_cpu(uint32_t thread_id) 239 { 240 CPUState *cpu; 241 242 CPU_FOREACH(cpu) { 243 if (gdb_get_cpu_index(cpu) == thread_id) { 244 return cpu; 245 } 246 } 247 248 return NULL; 249 } 250 251 CPUState *gdb_get_first_cpu_in_process(GDBProcess *process) 252 { 253 CPUState *cpu; 254 255 CPU_FOREACH(cpu) { 256 if (gdb_get_cpu_pid(cpu) == process->pid) { 257 return cpu; 258 } 259 } 260 261 return NULL; 262 } 263 264 static CPUState *gdb_next_cpu_in_process(CPUState *cpu) 265 { 266 uint32_t pid = gdb_get_cpu_pid(cpu); 267 cpu = CPU_NEXT(cpu); 268 269 while (cpu) { 270 if (gdb_get_cpu_pid(cpu) == pid) { 271 break; 272 } 273 274 cpu = CPU_NEXT(cpu); 275 } 276 277 return cpu; 278 } 279 280 /* Return the cpu following @cpu, while ignoring unattached processes. */ 281 static CPUState *gdb_next_attached_cpu(CPUState *cpu) 282 { 283 cpu = CPU_NEXT(cpu); 284 285 while (cpu) { 286 if (gdb_get_cpu_process(cpu)->attached) { 287 break; 288 } 289 290 cpu = CPU_NEXT(cpu); 291 } 292 293 return cpu; 294 } 295 296 /* Return the first attached cpu */ 297 CPUState *gdb_first_attached_cpu(void) 298 { 299 CPUState *cpu = first_cpu; 300 GDBProcess *process = gdb_get_cpu_process(cpu); 301 302 if (!process->attached) { 303 return gdb_next_attached_cpu(cpu); 304 } 305 306 return cpu; 307 } 308 309 static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid) 310 { 311 GDBProcess *process; 312 CPUState *cpu; 313 314 if (!pid && !tid) { 315 /* 0 means any process/thread, we take the first attached one */ 316 return gdb_first_attached_cpu(); 317 } else if (pid && !tid) { 318 /* any thread in a specific process */ 319 process = gdb_get_process(pid); 320 321 if (process == NULL) { 322 return NULL; 323 } 324 325 if (!process->attached) { 326 return NULL; 327 } 328 329 return gdb_get_first_cpu_in_process(process); 330 } else { 331 /* a specific thread */ 332 cpu = find_cpu(tid); 333 334 if (cpu == NULL) { 335 return NULL; 336 } 337 338 process = gdb_get_cpu_process(cpu); 339 340 if (pid && process->pid != pid) { 341 return NULL; 342 } 343 344 if (!process->attached) { 345 return NULL; 346 } 347 348 return cpu; 349 } 350 } 351 352 bool gdb_has_xml(void) 353 { 354 return !!gdb_get_cpu_process(gdbserver_state.g_cpu)->target_xml; 355 } 356 357 static const char *get_feature_xml(const char *p, const char **newp, 358 GDBProcess *process) 359 { 360 CPUState *cpu = gdb_get_first_cpu_in_process(process); 361 CPUClass *cc = CPU_GET_CLASS(cpu); 362 size_t len; 363 364 /* 365 * qXfer:features:read:ANNEX:OFFSET,LENGTH' 366 * ^p ^newp 367 */ 368 char *term = strchr(p, ':'); 369 *newp = term + 1; 370 len = term - p; 371 372 /* Is it the main target xml? */ 373 if (strncmp(p, "target.xml", len) == 0) { 374 if (!process->target_xml) { 375 GDBRegisterState *r; 376 GString *xml = g_string_new("<?xml version=\"1.0\"?>"); 377 378 g_string_append(xml, 379 "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" 380 "<target>"); 381 382 if (cc->gdb_arch_name) { 383 g_autofree gchar *arch = cc->gdb_arch_name(cpu); 384 g_string_append_printf(xml, 385 "<architecture>%s</architecture>", 386 arch); 387 } 388 g_string_append(xml, "<xi:include href=\""); 389 g_string_append(xml, cc->gdb_core_xml_file); 390 g_string_append(xml, "\"/>"); 391 for (r = cpu->gdb_regs; r; r = r->next) { 392 g_string_append(xml, "<xi:include href=\""); 393 g_string_append(xml, r->xml); 394 g_string_append(xml, "\"/>"); 395 } 396 g_string_append(xml, "</target>"); 397 398 process->target_xml = g_string_free(xml, false); 399 return process->target_xml; 400 } 401 } 402 /* Is it dynamically generated by the target? */ 403 if (cc->gdb_get_dynamic_xml) { 404 g_autofree char *xmlname = g_strndup(p, len); 405 const char *xml = cc->gdb_get_dynamic_xml(cpu, xmlname); 406 if (xml) { 407 return xml; 408 } 409 } 410 /* Is it one of the encoded gdb-xml/ files? */ 411 for (int i = 0; xml_builtin[i][0]; i++) { 412 const char *name = xml_builtin[i][0]; 413 if ((strncmp(name, p, len) == 0) && 414 strlen(name) == len) { 415 return xml_builtin[i][1]; 416 } 417 } 418 419 /* failed */ 420 return NULL; 421 } 422 423 static int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) 424 { 425 CPUClass *cc = CPU_GET_CLASS(cpu); 426 CPUArchState *env = cpu->env_ptr; 427 GDBRegisterState *r; 428 429 if (reg < cc->gdb_num_core_regs) { 430 return cc->gdb_read_register(cpu, buf, reg); 431 } 432 433 for (r = cpu->gdb_regs; r; r = r->next) { 434 if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { 435 return r->get_reg(env, buf, reg - r->base_reg); 436 } 437 } 438 return 0; 439 } 440 441 static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) 442 { 443 CPUClass *cc = CPU_GET_CLASS(cpu); 444 CPUArchState *env = cpu->env_ptr; 445 GDBRegisterState *r; 446 447 if (reg < cc->gdb_num_core_regs) { 448 return cc->gdb_write_register(cpu, mem_buf, reg); 449 } 450 451 for (r = cpu->gdb_regs; r; r = r->next) { 452 if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { 453 return r->set_reg(env, mem_buf, reg - r->base_reg); 454 } 455 } 456 return 0; 457 } 458 459 void gdb_register_coprocessor(CPUState *cpu, 460 gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg, 461 int num_regs, const char *xml, int g_pos) 462 { 463 GDBRegisterState *s; 464 GDBRegisterState **p; 465 466 p = &cpu->gdb_regs; 467 while (*p) { 468 /* Check for duplicates. */ 469 if (strcmp((*p)->xml, xml) == 0) 470 return; 471 p = &(*p)->next; 472 } 473 474 s = g_new0(GDBRegisterState, 1); 475 s->base_reg = cpu->gdb_num_regs; 476 s->num_regs = num_regs; 477 s->get_reg = get_reg; 478 s->set_reg = set_reg; 479 s->xml = xml; 480 481 /* Add to end of list. */ 482 cpu->gdb_num_regs += num_regs; 483 *p = s; 484 if (g_pos) { 485 if (g_pos != s->base_reg) { 486 error_report("Error: Bad gdb register numbering for '%s', " 487 "expected %d got %d", xml, g_pos, s->base_reg); 488 } else { 489 cpu->gdb_num_g_regs = cpu->gdb_num_regs; 490 } 491 } 492 } 493 494 static void gdb_process_breakpoint_remove_all(GDBProcess *p) 495 { 496 CPUState *cpu = gdb_get_first_cpu_in_process(p); 497 498 while (cpu) { 499 gdb_breakpoint_remove_all(cpu); 500 cpu = gdb_next_cpu_in_process(cpu); 501 } 502 } 503 504 505 static void gdb_set_cpu_pc(vaddr pc) 506 { 507 CPUState *cpu = gdbserver_state.c_cpu; 508 509 cpu_synchronize_state(cpu); 510 cpu_set_pc(cpu, pc); 511 } 512 513 void gdb_append_thread_id(CPUState *cpu, GString *buf) 514 { 515 if (gdbserver_state.multiprocess) { 516 g_string_append_printf(buf, "p%02x.%02x", 517 gdb_get_cpu_pid(cpu), gdb_get_cpu_index(cpu)); 518 } else { 519 g_string_append_printf(buf, "%02x", gdb_get_cpu_index(cpu)); 520 } 521 } 522 523 static GDBThreadIdKind read_thread_id(const char *buf, const char **end_buf, 524 uint32_t *pid, uint32_t *tid) 525 { 526 unsigned long p, t; 527 int ret; 528 529 if (*buf == 'p') { 530 buf++; 531 ret = qemu_strtoul(buf, &buf, 16, &p); 532 533 if (ret) { 534 return GDB_READ_THREAD_ERR; 535 } 536 537 /* Skip '.' */ 538 buf++; 539 } else { 540 p = 0; 541 } 542 543 ret = qemu_strtoul(buf, &buf, 16, &t); 544 545 if (ret) { 546 return GDB_READ_THREAD_ERR; 547 } 548 549 *end_buf = buf; 550 551 if (p == -1) { 552 return GDB_ALL_PROCESSES; 553 } 554 555 if (pid) { 556 *pid = p; 557 } 558 559 if (t == -1) { 560 return GDB_ALL_THREADS; 561 } 562 563 if (tid) { 564 *tid = t; 565 } 566 567 return GDB_ONE_THREAD; 568 } 569 570 /** 571 * gdb_handle_vcont - Parses and handles a vCont packet. 572 * returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is 573 * a format error, 0 on success. 574 */ 575 static int gdb_handle_vcont(const char *p) 576 { 577 int res, signal = 0; 578 char cur_action; 579 unsigned long tmp; 580 uint32_t pid, tid; 581 GDBProcess *process; 582 CPUState *cpu; 583 GDBThreadIdKind kind; 584 unsigned int max_cpus = gdb_get_max_cpus(); 585 /* uninitialised CPUs stay 0 */ 586 g_autofree char *newstates = g_new0(char, max_cpus); 587 588 /* mark valid CPUs with 1 */ 589 CPU_FOREACH(cpu) { 590 newstates[cpu->cpu_index] = 1; 591 } 592 593 /* 594 * res keeps track of what error we are returning, with -ENOTSUP meaning 595 * that the command is unknown or unsupported, thus returning an empty 596 * packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid, 597 * or incorrect parameters passed. 598 */ 599 res = 0; 600 601 /* 602 * target_count and last_target keep track of how many CPUs we are going to 603 * step or resume, and a pointer to the state structure of one of them, 604 * respectivelly 605 */ 606 int target_count = 0; 607 CPUState *last_target = NULL; 608 609 while (*p) { 610 if (*p++ != ';') { 611 return -ENOTSUP; 612 } 613 614 cur_action = *p++; 615 if (cur_action == 'C' || cur_action == 'S') { 616 cur_action = qemu_tolower(cur_action); 617 res = qemu_strtoul(p, &p, 16, &tmp); 618 if (res) { 619 return res; 620 } 621 signal = gdb_signal_to_target(tmp); 622 } else if (cur_action != 'c' && cur_action != 's') { 623 /* unknown/invalid/unsupported command */ 624 return -ENOTSUP; 625 } 626 627 if (*p == '\0' || *p == ';') { 628 /* 629 * No thread specifier, action is on "all threads". The 630 * specification is unclear regarding the process to act on. We 631 * choose all processes. 632 */ 633 kind = GDB_ALL_PROCESSES; 634 } else if (*p++ == ':') { 635 kind = read_thread_id(p, &p, &pid, &tid); 636 } else { 637 return -ENOTSUP; 638 } 639 640 switch (kind) { 641 case GDB_READ_THREAD_ERR: 642 return -EINVAL; 643 644 case GDB_ALL_PROCESSES: 645 cpu = gdb_first_attached_cpu(); 646 while (cpu) { 647 if (newstates[cpu->cpu_index] == 1) { 648 newstates[cpu->cpu_index] = cur_action; 649 650 target_count++; 651 last_target = cpu; 652 } 653 654 cpu = gdb_next_attached_cpu(cpu); 655 } 656 break; 657 658 case GDB_ALL_THREADS: 659 process = gdb_get_process(pid); 660 661 if (!process->attached) { 662 return -EINVAL; 663 } 664 665 cpu = gdb_get_first_cpu_in_process(process); 666 while (cpu) { 667 if (newstates[cpu->cpu_index] == 1) { 668 newstates[cpu->cpu_index] = cur_action; 669 670 target_count++; 671 last_target = cpu; 672 } 673 674 cpu = gdb_next_cpu_in_process(cpu); 675 } 676 break; 677 678 case GDB_ONE_THREAD: 679 cpu = gdb_get_cpu(pid, tid); 680 681 /* invalid CPU/thread specified */ 682 if (!cpu) { 683 return -EINVAL; 684 } 685 686 /* only use if no previous match occourred */ 687 if (newstates[cpu->cpu_index] == 1) { 688 newstates[cpu->cpu_index] = cur_action; 689 690 target_count++; 691 last_target = cpu; 692 } 693 break; 694 } 695 } 696 697 /* 698 * if we're about to resume a specific set of CPUs/threads, make it so that 699 * in case execution gets interrupted, we can send GDB a stop reply with a 700 * correct value. it doesn't really matter which CPU we tell GDB the signal 701 * happened in (VM pauses stop all of them anyway), so long as it is one of 702 * the ones we resumed/single stepped here. 703 */ 704 if (target_count > 0) { 705 gdbserver_state.c_cpu = last_target; 706 } 707 708 gdbserver_state.signal = signal; 709 gdb_continue_partial(newstates); 710 return res; 711 } 712 713 static const char *cmd_next_param(const char *param, const char delimiter) 714 { 715 static const char all_delimiters[] = ",;:="; 716 char curr_delimiters[2] = {0}; 717 const char *delimiters; 718 719 if (delimiter == '?') { 720 delimiters = all_delimiters; 721 } else if (delimiter == '0') { 722 return strchr(param, '\0'); 723 } else if (delimiter == '.' && *param) { 724 return param + 1; 725 } else { 726 curr_delimiters[0] = delimiter; 727 delimiters = curr_delimiters; 728 } 729 730 param += strcspn(param, delimiters); 731 if (*param) { 732 param++; 733 } 734 return param; 735 } 736 737 static int cmd_parse_params(const char *data, const char *schema, 738 GArray *params) 739 { 740 const char *curr_schema, *curr_data; 741 742 g_assert(schema); 743 g_assert(params->len == 0); 744 745 curr_schema = schema; 746 curr_data = data; 747 while (curr_schema[0] && curr_schema[1] && *curr_data) { 748 GdbCmdVariant this_param; 749 750 switch (curr_schema[0]) { 751 case 'l': 752 if (qemu_strtoul(curr_data, &curr_data, 16, 753 &this_param.val_ul)) { 754 return -EINVAL; 755 } 756 curr_data = cmd_next_param(curr_data, curr_schema[1]); 757 g_array_append_val(params, this_param); 758 break; 759 case 'L': 760 if (qemu_strtou64(curr_data, &curr_data, 16, 761 (uint64_t *)&this_param.val_ull)) { 762 return -EINVAL; 763 } 764 curr_data = cmd_next_param(curr_data, curr_schema[1]); 765 g_array_append_val(params, this_param); 766 break; 767 case 's': 768 this_param.data = curr_data; 769 curr_data = cmd_next_param(curr_data, curr_schema[1]); 770 g_array_append_val(params, this_param); 771 break; 772 case 'o': 773 this_param.opcode = *(uint8_t *)curr_data; 774 curr_data = cmd_next_param(curr_data, curr_schema[1]); 775 g_array_append_val(params, this_param); 776 break; 777 case 't': 778 this_param.thread_id.kind = 779 read_thread_id(curr_data, &curr_data, 780 &this_param.thread_id.pid, 781 &this_param.thread_id.tid); 782 curr_data = cmd_next_param(curr_data, curr_schema[1]); 783 g_array_append_val(params, this_param); 784 break; 785 case '?': 786 curr_data = cmd_next_param(curr_data, curr_schema[1]); 787 break; 788 default: 789 return -EINVAL; 790 } 791 curr_schema += 2; 792 } 793 794 return 0; 795 } 796 797 typedef void (*GdbCmdHandler)(GArray *params, void *user_ctx); 798 799 /* 800 * cmd_startswith -> cmd is compared using startswith 801 * 802 * allow_stop_reply -> true iff the gdbstub can respond to this command with a 803 * "stop reply" packet. The list of commands that accept such response is 804 * defined at the GDB Remote Serial Protocol documentation. see: 805 * https://sourceware.org/gdb/onlinedocs/gdb/Stop-Reply-Packets.html#Stop-Reply-Packets. 806 * 807 * schema definitions: 808 * Each schema parameter entry consists of 2 chars, 809 * the first char represents the parameter type handling 810 * the second char represents the delimiter for the next parameter 811 * 812 * Currently supported schema types: 813 * 'l' -> unsigned long (stored in .val_ul) 814 * 'L' -> unsigned long long (stored in .val_ull) 815 * 's' -> string (stored in .data) 816 * 'o' -> single char (stored in .opcode) 817 * 't' -> thread id (stored in .thread_id) 818 * '?' -> skip according to delimiter 819 * 820 * Currently supported delimiters: 821 * '?' -> Stop at any delimiter (",;:=\0") 822 * '0' -> Stop at "\0" 823 * '.' -> Skip 1 char unless reached "\0" 824 * Any other value is treated as the delimiter value itself 825 */ 826 typedef struct GdbCmdParseEntry { 827 GdbCmdHandler handler; 828 const char *cmd; 829 bool cmd_startswith; 830 const char *schema; 831 bool allow_stop_reply; 832 } GdbCmdParseEntry; 833 834 static inline int startswith(const char *string, const char *pattern) 835 { 836 return !strncmp(string, pattern, strlen(pattern)); 837 } 838 839 static int process_string_cmd(const char *data, 840 const GdbCmdParseEntry *cmds, int num_cmds) 841 { 842 int i; 843 g_autoptr(GArray) params = g_array_new(false, true, sizeof(GdbCmdVariant)); 844 845 if (!cmds) { 846 return -1; 847 } 848 849 for (i = 0; i < num_cmds; i++) { 850 const GdbCmdParseEntry *cmd = &cmds[i]; 851 g_assert(cmd->handler && cmd->cmd); 852 853 if ((cmd->cmd_startswith && !startswith(data, cmd->cmd)) || 854 (!cmd->cmd_startswith && strcmp(cmd->cmd, data))) { 855 continue; 856 } 857 858 if (cmd->schema) { 859 if (cmd_parse_params(&data[strlen(cmd->cmd)], 860 cmd->schema, params)) { 861 return -1; 862 } 863 } 864 865 gdbserver_state.allow_stop_reply = cmd->allow_stop_reply; 866 cmd->handler(params, NULL); 867 return 0; 868 } 869 870 return -1; 871 } 872 873 static void run_cmd_parser(const char *data, const GdbCmdParseEntry *cmd) 874 { 875 if (!data) { 876 return; 877 } 878 879 g_string_set_size(gdbserver_state.str_buf, 0); 880 g_byte_array_set_size(gdbserver_state.mem_buf, 0); 881 882 /* In case there was an error during the command parsing we must 883 * send a NULL packet to indicate the command is not supported */ 884 if (process_string_cmd(data, cmd, 1)) { 885 gdb_put_packet(""); 886 } 887 } 888 889 static void handle_detach(GArray *params, void *user_ctx) 890 { 891 GDBProcess *process; 892 uint32_t pid = 1; 893 894 if (gdbserver_state.multiprocess) { 895 if (!params->len) { 896 gdb_put_packet("E22"); 897 return; 898 } 899 900 pid = get_param(params, 0)->val_ul; 901 } 902 903 process = gdb_get_process(pid); 904 gdb_process_breakpoint_remove_all(process); 905 process->attached = false; 906 907 if (pid == gdb_get_cpu_pid(gdbserver_state.c_cpu)) { 908 gdbserver_state.c_cpu = gdb_first_attached_cpu(); 909 } 910 911 if (pid == gdb_get_cpu_pid(gdbserver_state.g_cpu)) { 912 gdbserver_state.g_cpu = gdb_first_attached_cpu(); 913 } 914 915 if (!gdbserver_state.c_cpu) { 916 /* No more process attached */ 917 gdb_disable_syscalls(); 918 gdb_continue(); 919 } 920 gdb_put_packet("OK"); 921 } 922 923 static void handle_thread_alive(GArray *params, void *user_ctx) 924 { 925 CPUState *cpu; 926 927 if (!params->len) { 928 gdb_put_packet("E22"); 929 return; 930 } 931 932 if (get_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) { 933 gdb_put_packet("E22"); 934 return; 935 } 936 937 cpu = gdb_get_cpu(get_param(params, 0)->thread_id.pid, 938 get_param(params, 0)->thread_id.tid); 939 if (!cpu) { 940 gdb_put_packet("E22"); 941 return; 942 } 943 944 gdb_put_packet("OK"); 945 } 946 947 static void handle_continue(GArray *params, void *user_ctx) 948 { 949 if (params->len) { 950 gdb_set_cpu_pc(get_param(params, 0)->val_ull); 951 } 952 953 gdbserver_state.signal = 0; 954 gdb_continue(); 955 } 956 957 static void handle_cont_with_sig(GArray *params, void *user_ctx) 958 { 959 unsigned long signal = 0; 960 961 /* 962 * Note: C sig;[addr] is currently unsupported and we simply 963 * omit the addr parameter 964 */ 965 if (params->len) { 966 signal = get_param(params, 0)->val_ul; 967 } 968 969 gdbserver_state.signal = gdb_signal_to_target(signal); 970 if (gdbserver_state.signal == -1) { 971 gdbserver_state.signal = 0; 972 } 973 gdb_continue(); 974 } 975 976 static void handle_set_thread(GArray *params, void *user_ctx) 977 { 978 CPUState *cpu; 979 980 if (params->len != 2) { 981 gdb_put_packet("E22"); 982 return; 983 } 984 985 if (get_param(params, 1)->thread_id.kind == GDB_READ_THREAD_ERR) { 986 gdb_put_packet("E22"); 987 return; 988 } 989 990 if (get_param(params, 1)->thread_id.kind != GDB_ONE_THREAD) { 991 gdb_put_packet("OK"); 992 return; 993 } 994 995 cpu = gdb_get_cpu(get_param(params, 1)->thread_id.pid, 996 get_param(params, 1)->thread_id.tid); 997 if (!cpu) { 998 gdb_put_packet("E22"); 999 return; 1000 } 1001 1002 /* 1003 * Note: This command is deprecated and modern gdb's will be using the 1004 * vCont command instead. 1005 */ 1006 switch (get_param(params, 0)->opcode) { 1007 case 'c': 1008 gdbserver_state.c_cpu = cpu; 1009 gdb_put_packet("OK"); 1010 break; 1011 case 'g': 1012 gdbserver_state.g_cpu = cpu; 1013 gdb_put_packet("OK"); 1014 break; 1015 default: 1016 gdb_put_packet("E22"); 1017 break; 1018 } 1019 } 1020 1021 static void handle_insert_bp(GArray *params, void *user_ctx) 1022 { 1023 int res; 1024 1025 if (params->len != 3) { 1026 gdb_put_packet("E22"); 1027 return; 1028 } 1029 1030 res = gdb_breakpoint_insert(gdbserver_state.c_cpu, 1031 get_param(params, 0)->val_ul, 1032 get_param(params, 1)->val_ull, 1033 get_param(params, 2)->val_ull); 1034 if (res >= 0) { 1035 gdb_put_packet("OK"); 1036 return; 1037 } else if (res == -ENOSYS) { 1038 gdb_put_packet(""); 1039 return; 1040 } 1041 1042 gdb_put_packet("E22"); 1043 } 1044 1045 static void handle_remove_bp(GArray *params, void *user_ctx) 1046 { 1047 int res; 1048 1049 if (params->len != 3) { 1050 gdb_put_packet("E22"); 1051 return; 1052 } 1053 1054 res = gdb_breakpoint_remove(gdbserver_state.c_cpu, 1055 get_param(params, 0)->val_ul, 1056 get_param(params, 1)->val_ull, 1057 get_param(params, 2)->val_ull); 1058 if (res >= 0) { 1059 gdb_put_packet("OK"); 1060 return; 1061 } else if (res == -ENOSYS) { 1062 gdb_put_packet(""); 1063 return; 1064 } 1065 1066 gdb_put_packet("E22"); 1067 } 1068 1069 /* 1070 * handle_set/get_reg 1071 * 1072 * Older gdb are really dumb, and don't use 'G/g' if 'P/p' is available. 1073 * This works, but can be very slow. Anything new enough to understand 1074 * XML also knows how to use this properly. However to use this we 1075 * need to define a local XML file as well as be talking to a 1076 * reasonably modern gdb. Responding with an empty packet will cause 1077 * the remote gdb to fallback to older methods. 1078 */ 1079 1080 static void handle_set_reg(GArray *params, void *user_ctx) 1081 { 1082 int reg_size; 1083 1084 if (!gdb_get_cpu_process(gdbserver_state.g_cpu)->target_xml) { 1085 gdb_put_packet(""); 1086 return; 1087 } 1088 1089 if (params->len != 2) { 1090 gdb_put_packet("E22"); 1091 return; 1092 } 1093 1094 reg_size = strlen(get_param(params, 1)->data) / 2; 1095 gdb_hextomem(gdbserver_state.mem_buf, get_param(params, 1)->data, reg_size); 1096 gdb_write_register(gdbserver_state.g_cpu, gdbserver_state.mem_buf->data, 1097 get_param(params, 0)->val_ull); 1098 gdb_put_packet("OK"); 1099 } 1100 1101 static void handle_get_reg(GArray *params, void *user_ctx) 1102 { 1103 int reg_size; 1104 1105 if (!gdb_get_cpu_process(gdbserver_state.g_cpu)->target_xml) { 1106 gdb_put_packet(""); 1107 return; 1108 } 1109 1110 if (!params->len) { 1111 gdb_put_packet("E14"); 1112 return; 1113 } 1114 1115 reg_size = gdb_read_register(gdbserver_state.g_cpu, 1116 gdbserver_state.mem_buf, 1117 get_param(params, 0)->val_ull); 1118 if (!reg_size) { 1119 gdb_put_packet("E14"); 1120 return; 1121 } else { 1122 g_byte_array_set_size(gdbserver_state.mem_buf, reg_size); 1123 } 1124 1125 gdb_memtohex(gdbserver_state.str_buf, 1126 gdbserver_state.mem_buf->data, reg_size); 1127 gdb_put_strbuf(); 1128 } 1129 1130 static void handle_write_mem(GArray *params, void *user_ctx) 1131 { 1132 if (params->len != 3) { 1133 gdb_put_packet("E22"); 1134 return; 1135 } 1136 1137 /* gdb_hextomem() reads 2*len bytes */ 1138 if (get_param(params, 1)->val_ull > 1139 strlen(get_param(params, 2)->data) / 2) { 1140 gdb_put_packet("E22"); 1141 return; 1142 } 1143 1144 gdb_hextomem(gdbserver_state.mem_buf, get_param(params, 2)->data, 1145 get_param(params, 1)->val_ull); 1146 if (gdb_target_memory_rw_debug(gdbserver_state.g_cpu, 1147 get_param(params, 0)->val_ull, 1148 gdbserver_state.mem_buf->data, 1149 gdbserver_state.mem_buf->len, true)) { 1150 gdb_put_packet("E14"); 1151 return; 1152 } 1153 1154 gdb_put_packet("OK"); 1155 } 1156 1157 static void handle_read_mem(GArray *params, void *user_ctx) 1158 { 1159 if (params->len != 2) { 1160 gdb_put_packet("E22"); 1161 return; 1162 } 1163 1164 /* gdb_memtohex() doubles the required space */ 1165 if (get_param(params, 1)->val_ull > MAX_PACKET_LENGTH / 2) { 1166 gdb_put_packet("E22"); 1167 return; 1168 } 1169 1170 g_byte_array_set_size(gdbserver_state.mem_buf, 1171 get_param(params, 1)->val_ull); 1172 1173 if (gdb_target_memory_rw_debug(gdbserver_state.g_cpu, 1174 get_param(params, 0)->val_ull, 1175 gdbserver_state.mem_buf->data, 1176 gdbserver_state.mem_buf->len, false)) { 1177 gdb_put_packet("E14"); 1178 return; 1179 } 1180 1181 gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, 1182 gdbserver_state.mem_buf->len); 1183 gdb_put_strbuf(); 1184 } 1185 1186 static void handle_write_all_regs(GArray *params, void *user_ctx) 1187 { 1188 int reg_id; 1189 size_t len; 1190 uint8_t *registers; 1191 int reg_size; 1192 1193 if (!params->len) { 1194 return; 1195 } 1196 1197 cpu_synchronize_state(gdbserver_state.g_cpu); 1198 len = strlen(get_param(params, 0)->data) / 2; 1199 gdb_hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len); 1200 registers = gdbserver_state.mem_buf->data; 1201 for (reg_id = 0; 1202 reg_id < gdbserver_state.g_cpu->gdb_num_g_regs && len > 0; 1203 reg_id++) { 1204 reg_size = gdb_write_register(gdbserver_state.g_cpu, registers, reg_id); 1205 len -= reg_size; 1206 registers += reg_size; 1207 } 1208 gdb_put_packet("OK"); 1209 } 1210 1211 static void handle_read_all_regs(GArray *params, void *user_ctx) 1212 { 1213 int reg_id; 1214 size_t len; 1215 1216 cpu_synchronize_state(gdbserver_state.g_cpu); 1217 g_byte_array_set_size(gdbserver_state.mem_buf, 0); 1218 len = 0; 1219 for (reg_id = 0; reg_id < gdbserver_state.g_cpu->gdb_num_g_regs; reg_id++) { 1220 len += gdb_read_register(gdbserver_state.g_cpu, 1221 gdbserver_state.mem_buf, 1222 reg_id); 1223 } 1224 g_assert(len == gdbserver_state.mem_buf->len); 1225 1226 gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len); 1227 gdb_put_strbuf(); 1228 } 1229 1230 1231 static void handle_step(GArray *params, void *user_ctx) 1232 { 1233 if (params->len) { 1234 gdb_set_cpu_pc(get_param(params, 0)->val_ull); 1235 } 1236 1237 cpu_single_step(gdbserver_state.c_cpu, gdbserver_state.sstep_flags); 1238 gdb_continue(); 1239 } 1240 1241 static void handle_backward(GArray *params, void *user_ctx) 1242 { 1243 if (!gdb_can_reverse()) { 1244 gdb_put_packet("E22"); 1245 } 1246 if (params->len == 1) { 1247 switch (get_param(params, 0)->opcode) { 1248 case 's': 1249 if (replay_reverse_step()) { 1250 gdb_continue(); 1251 } else { 1252 gdb_put_packet("E14"); 1253 } 1254 return; 1255 case 'c': 1256 if (replay_reverse_continue()) { 1257 gdb_continue(); 1258 } else { 1259 gdb_put_packet("E14"); 1260 } 1261 return; 1262 } 1263 } 1264 1265 /* Default invalid command */ 1266 gdb_put_packet(""); 1267 } 1268 1269 static void handle_v_cont_query(GArray *params, void *user_ctx) 1270 { 1271 gdb_put_packet("vCont;c;C;s;S"); 1272 } 1273 1274 static void handle_v_cont(GArray *params, void *user_ctx) 1275 { 1276 int res; 1277 1278 if (!params->len) { 1279 return; 1280 } 1281 1282 res = gdb_handle_vcont(get_param(params, 0)->data); 1283 if ((res == -EINVAL) || (res == -ERANGE)) { 1284 gdb_put_packet("E22"); 1285 } else if (res) { 1286 gdb_put_packet(""); 1287 } 1288 } 1289 1290 static void handle_v_attach(GArray *params, void *user_ctx) 1291 { 1292 GDBProcess *process; 1293 CPUState *cpu; 1294 1295 g_string_assign(gdbserver_state.str_buf, "E22"); 1296 if (!params->len) { 1297 goto cleanup; 1298 } 1299 1300 process = gdb_get_process(get_param(params, 0)->val_ul); 1301 if (!process) { 1302 goto cleanup; 1303 } 1304 1305 cpu = gdb_get_first_cpu_in_process(process); 1306 if (!cpu) { 1307 goto cleanup; 1308 } 1309 1310 process->attached = true; 1311 gdbserver_state.g_cpu = cpu; 1312 gdbserver_state.c_cpu = cpu; 1313 1314 if (gdbserver_state.allow_stop_reply) { 1315 g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); 1316 gdb_append_thread_id(cpu, gdbserver_state.str_buf); 1317 g_string_append_c(gdbserver_state.str_buf, ';'); 1318 gdbserver_state.allow_stop_reply = false; 1319 cleanup: 1320 gdb_put_strbuf(); 1321 } 1322 } 1323 1324 static void handle_v_kill(GArray *params, void *user_ctx) 1325 { 1326 /* Kill the target */ 1327 gdb_put_packet("OK"); 1328 error_report("QEMU: Terminated via GDBstub"); 1329 gdb_exit(0); 1330 exit(0); 1331 } 1332 1333 static const GdbCmdParseEntry gdb_v_commands_table[] = { 1334 /* Order is important if has same prefix */ 1335 { 1336 .handler = handle_v_cont_query, 1337 .cmd = "Cont?", 1338 .cmd_startswith = 1 1339 }, 1340 { 1341 .handler = handle_v_cont, 1342 .cmd = "Cont", 1343 .cmd_startswith = 1, 1344 .allow_stop_reply = true, 1345 .schema = "s0" 1346 }, 1347 { 1348 .handler = handle_v_attach, 1349 .cmd = "Attach;", 1350 .cmd_startswith = 1, 1351 .allow_stop_reply = true, 1352 .schema = "l0" 1353 }, 1354 { 1355 .handler = handle_v_kill, 1356 .cmd = "Kill;", 1357 .cmd_startswith = 1 1358 }, 1359 #ifdef CONFIG_USER_ONLY 1360 /* 1361 * Host I/O Packets. See [1] for details. 1362 * [1] https://sourceware.org/gdb/onlinedocs/gdb/Host-I_002fO-Packets.html 1363 */ 1364 { 1365 .handler = gdb_handle_v_file_open, 1366 .cmd = "File:open:", 1367 .cmd_startswith = 1, 1368 .schema = "s,L,L0" 1369 }, 1370 { 1371 .handler = gdb_handle_v_file_close, 1372 .cmd = "File:close:", 1373 .cmd_startswith = 1, 1374 .schema = "l0" 1375 }, 1376 { 1377 .handler = gdb_handle_v_file_pread, 1378 .cmd = "File:pread:", 1379 .cmd_startswith = 1, 1380 .schema = "l,L,L0" 1381 }, 1382 { 1383 .handler = gdb_handle_v_file_readlink, 1384 .cmd = "File:readlink:", 1385 .cmd_startswith = 1, 1386 .schema = "s0" 1387 }, 1388 #endif 1389 }; 1390 1391 static void handle_v_commands(GArray *params, void *user_ctx) 1392 { 1393 if (!params->len) { 1394 return; 1395 } 1396 1397 if (process_string_cmd(get_param(params, 0)->data, 1398 gdb_v_commands_table, 1399 ARRAY_SIZE(gdb_v_commands_table))) { 1400 gdb_put_packet(""); 1401 } 1402 } 1403 1404 static void handle_query_qemu_sstepbits(GArray *params, void *user_ctx) 1405 { 1406 g_string_printf(gdbserver_state.str_buf, "ENABLE=%x", SSTEP_ENABLE); 1407 1408 if (gdbserver_state.supported_sstep_flags & SSTEP_NOIRQ) { 1409 g_string_append_printf(gdbserver_state.str_buf, ",NOIRQ=%x", 1410 SSTEP_NOIRQ); 1411 } 1412 1413 if (gdbserver_state.supported_sstep_flags & SSTEP_NOTIMER) { 1414 g_string_append_printf(gdbserver_state.str_buf, ",NOTIMER=%x", 1415 SSTEP_NOTIMER); 1416 } 1417 1418 gdb_put_strbuf(); 1419 } 1420 1421 static void handle_set_qemu_sstep(GArray *params, void *user_ctx) 1422 { 1423 int new_sstep_flags; 1424 1425 if (!params->len) { 1426 return; 1427 } 1428 1429 new_sstep_flags = get_param(params, 0)->val_ul; 1430 1431 if (new_sstep_flags & ~gdbserver_state.supported_sstep_flags) { 1432 gdb_put_packet("E22"); 1433 return; 1434 } 1435 1436 gdbserver_state.sstep_flags = new_sstep_flags; 1437 gdb_put_packet("OK"); 1438 } 1439 1440 static void handle_query_qemu_sstep(GArray *params, void *user_ctx) 1441 { 1442 g_string_printf(gdbserver_state.str_buf, "0x%x", 1443 gdbserver_state.sstep_flags); 1444 gdb_put_strbuf(); 1445 } 1446 1447 static void handle_query_curr_tid(GArray *params, void *user_ctx) 1448 { 1449 CPUState *cpu; 1450 GDBProcess *process; 1451 1452 /* 1453 * "Current thread" remains vague in the spec, so always return 1454 * the first thread of the current process (gdb returns the 1455 * first thread). 1456 */ 1457 process = gdb_get_cpu_process(gdbserver_state.g_cpu); 1458 cpu = gdb_get_first_cpu_in_process(process); 1459 g_string_assign(gdbserver_state.str_buf, "QC"); 1460 gdb_append_thread_id(cpu, gdbserver_state.str_buf); 1461 gdb_put_strbuf(); 1462 } 1463 1464 static void handle_query_threads(GArray *params, void *user_ctx) 1465 { 1466 if (!gdbserver_state.query_cpu) { 1467 gdb_put_packet("l"); 1468 return; 1469 } 1470 1471 g_string_assign(gdbserver_state.str_buf, "m"); 1472 gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf); 1473 gdb_put_strbuf(); 1474 gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu); 1475 } 1476 1477 static void handle_query_first_threads(GArray *params, void *user_ctx) 1478 { 1479 gdbserver_state.query_cpu = gdb_first_attached_cpu(); 1480 handle_query_threads(params, user_ctx); 1481 } 1482 1483 static void handle_query_thread_extra(GArray *params, void *user_ctx) 1484 { 1485 g_autoptr(GString) rs = g_string_new(NULL); 1486 CPUState *cpu; 1487 1488 if (!params->len || 1489 get_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) { 1490 gdb_put_packet("E22"); 1491 return; 1492 } 1493 1494 cpu = gdb_get_cpu(get_param(params, 0)->thread_id.pid, 1495 get_param(params, 0)->thread_id.tid); 1496 if (!cpu) { 1497 return; 1498 } 1499 1500 cpu_synchronize_state(cpu); 1501 1502 if (gdbserver_state.multiprocess && (gdbserver_state.process_num > 1)) { 1503 /* Print the CPU model and name in multiprocess mode */ 1504 ObjectClass *oc = object_get_class(OBJECT(cpu)); 1505 const char *cpu_model = object_class_get_name(oc); 1506 const char *cpu_name = 1507 object_get_canonical_path_component(OBJECT(cpu)); 1508 g_string_printf(rs, "%s %s [%s]", cpu_model, cpu_name, 1509 cpu->halted ? "halted " : "running"); 1510 } else { 1511 g_string_printf(rs, "CPU#%d [%s]", cpu->cpu_index, 1512 cpu->halted ? "halted " : "running"); 1513 } 1514 trace_gdbstub_op_extra_info(rs->str); 1515 gdb_memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len); 1516 gdb_put_strbuf(); 1517 } 1518 1519 static void handle_query_supported(GArray *params, void *user_ctx) 1520 { 1521 CPUClass *cc; 1522 1523 g_string_printf(gdbserver_state.str_buf, "PacketSize=%x", MAX_PACKET_LENGTH); 1524 cc = CPU_GET_CLASS(first_cpu); 1525 if (cc->gdb_core_xml_file) { 1526 g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+"); 1527 } 1528 1529 if (gdb_can_reverse()) { 1530 g_string_append(gdbserver_state.str_buf, 1531 ";ReverseStep+;ReverseContinue+"); 1532 } 1533 1534 #if defined(CONFIG_USER_ONLY) 1535 #if defined(CONFIG_LINUX) 1536 if (gdbserver_state.c_cpu->opaque) { 1537 g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+"); 1538 } 1539 #endif 1540 g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+"); 1541 #endif 1542 1543 if (params->len && 1544 strstr(get_param(params, 0)->data, "multiprocess+")) { 1545 gdbserver_state.multiprocess = true; 1546 } 1547 1548 g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+"); 1549 gdb_put_strbuf(); 1550 } 1551 1552 static void handle_query_xfer_features(GArray *params, void *user_ctx) 1553 { 1554 GDBProcess *process; 1555 CPUClass *cc; 1556 unsigned long len, total_len, addr; 1557 const char *xml; 1558 const char *p; 1559 1560 if (params->len < 3) { 1561 gdb_put_packet("E22"); 1562 return; 1563 } 1564 1565 process = gdb_get_cpu_process(gdbserver_state.g_cpu); 1566 cc = CPU_GET_CLASS(gdbserver_state.g_cpu); 1567 if (!cc->gdb_core_xml_file) { 1568 gdb_put_packet(""); 1569 return; 1570 } 1571 1572 p = get_param(params, 0)->data; 1573 xml = get_feature_xml(p, &p, process); 1574 if (!xml) { 1575 gdb_put_packet("E00"); 1576 return; 1577 } 1578 1579 addr = get_param(params, 1)->val_ul; 1580 len = get_param(params, 2)->val_ul; 1581 total_len = strlen(xml); 1582 if (addr > total_len) { 1583 gdb_put_packet("E00"); 1584 return; 1585 } 1586 1587 if (len > (MAX_PACKET_LENGTH - 5) / 2) { 1588 len = (MAX_PACKET_LENGTH - 5) / 2; 1589 } 1590 1591 if (len < total_len - addr) { 1592 g_string_assign(gdbserver_state.str_buf, "m"); 1593 gdb_memtox(gdbserver_state.str_buf, xml + addr, len); 1594 } else { 1595 g_string_assign(gdbserver_state.str_buf, "l"); 1596 gdb_memtox(gdbserver_state.str_buf, xml + addr, total_len - addr); 1597 } 1598 1599 gdb_put_packet_binary(gdbserver_state.str_buf->str, 1600 gdbserver_state.str_buf->len, true); 1601 } 1602 1603 static void handle_query_qemu_supported(GArray *params, void *user_ctx) 1604 { 1605 g_string_printf(gdbserver_state.str_buf, "sstepbits;sstep"); 1606 #ifndef CONFIG_USER_ONLY 1607 g_string_append(gdbserver_state.str_buf, ";PhyMemMode"); 1608 #endif 1609 gdb_put_strbuf(); 1610 } 1611 1612 static const GdbCmdParseEntry gdb_gen_query_set_common_table[] = { 1613 /* Order is important if has same prefix */ 1614 { 1615 .handler = handle_query_qemu_sstepbits, 1616 .cmd = "qemu.sstepbits", 1617 }, 1618 { 1619 .handler = handle_query_qemu_sstep, 1620 .cmd = "qemu.sstep", 1621 }, 1622 { 1623 .handler = handle_set_qemu_sstep, 1624 .cmd = "qemu.sstep=", 1625 .cmd_startswith = 1, 1626 .schema = "l0" 1627 }, 1628 }; 1629 1630 static const GdbCmdParseEntry gdb_gen_query_table[] = { 1631 { 1632 .handler = handle_query_curr_tid, 1633 .cmd = "C", 1634 }, 1635 { 1636 .handler = handle_query_threads, 1637 .cmd = "sThreadInfo", 1638 }, 1639 { 1640 .handler = handle_query_first_threads, 1641 .cmd = "fThreadInfo", 1642 }, 1643 { 1644 .handler = handle_query_thread_extra, 1645 .cmd = "ThreadExtraInfo,", 1646 .cmd_startswith = 1, 1647 .schema = "t0" 1648 }, 1649 #ifdef CONFIG_USER_ONLY 1650 { 1651 .handler = gdb_handle_query_offsets, 1652 .cmd = "Offsets", 1653 }, 1654 #else 1655 { 1656 .handler = gdb_handle_query_rcmd, 1657 .cmd = "Rcmd,", 1658 .cmd_startswith = 1, 1659 .schema = "s0" 1660 }, 1661 #endif 1662 { 1663 .handler = handle_query_supported, 1664 .cmd = "Supported:", 1665 .cmd_startswith = 1, 1666 .schema = "s0" 1667 }, 1668 { 1669 .handler = handle_query_supported, 1670 .cmd = "Supported", 1671 .schema = "s0" 1672 }, 1673 { 1674 .handler = handle_query_xfer_features, 1675 .cmd = "Xfer:features:read:", 1676 .cmd_startswith = 1, 1677 .schema = "s:l,l0" 1678 }, 1679 #if defined(CONFIG_USER_ONLY) 1680 #if defined(CONFIG_LINUX) 1681 { 1682 .handler = gdb_handle_query_xfer_auxv, 1683 .cmd = "Xfer:auxv:read::", 1684 .cmd_startswith = 1, 1685 .schema = "l,l0" 1686 }, 1687 #endif 1688 { 1689 .handler = gdb_handle_query_xfer_exec_file, 1690 .cmd = "Xfer:exec-file:read:", 1691 .cmd_startswith = 1, 1692 .schema = "l:l,l0" 1693 }, 1694 #endif 1695 { 1696 .handler = gdb_handle_query_attached, 1697 .cmd = "Attached:", 1698 .cmd_startswith = 1 1699 }, 1700 { 1701 .handler = gdb_handle_query_attached, 1702 .cmd = "Attached", 1703 }, 1704 { 1705 .handler = handle_query_qemu_supported, 1706 .cmd = "qemu.Supported", 1707 }, 1708 #ifndef CONFIG_USER_ONLY 1709 { 1710 .handler = gdb_handle_query_qemu_phy_mem_mode, 1711 .cmd = "qemu.PhyMemMode", 1712 }, 1713 #endif 1714 }; 1715 1716 static const GdbCmdParseEntry gdb_gen_set_table[] = { 1717 /* Order is important if has same prefix */ 1718 { 1719 .handler = handle_set_qemu_sstep, 1720 .cmd = "qemu.sstep:", 1721 .cmd_startswith = 1, 1722 .schema = "l0" 1723 }, 1724 #ifndef CONFIG_USER_ONLY 1725 { 1726 .handler = gdb_handle_set_qemu_phy_mem_mode, 1727 .cmd = "qemu.PhyMemMode:", 1728 .cmd_startswith = 1, 1729 .schema = "l0" 1730 }, 1731 #endif 1732 }; 1733 1734 static void handle_gen_query(GArray *params, void *user_ctx) 1735 { 1736 if (!params->len) { 1737 return; 1738 } 1739 1740 if (!process_string_cmd(get_param(params, 0)->data, 1741 gdb_gen_query_set_common_table, 1742 ARRAY_SIZE(gdb_gen_query_set_common_table))) { 1743 return; 1744 } 1745 1746 if (process_string_cmd(get_param(params, 0)->data, 1747 gdb_gen_query_table, 1748 ARRAY_SIZE(gdb_gen_query_table))) { 1749 gdb_put_packet(""); 1750 } 1751 } 1752 1753 static void handle_gen_set(GArray *params, void *user_ctx) 1754 { 1755 if (!params->len) { 1756 return; 1757 } 1758 1759 if (!process_string_cmd(get_param(params, 0)->data, 1760 gdb_gen_query_set_common_table, 1761 ARRAY_SIZE(gdb_gen_query_set_common_table))) { 1762 return; 1763 } 1764 1765 if (process_string_cmd(get_param(params, 0)->data, 1766 gdb_gen_set_table, 1767 ARRAY_SIZE(gdb_gen_set_table))) { 1768 gdb_put_packet(""); 1769 } 1770 } 1771 1772 static void handle_target_halt(GArray *params, void *user_ctx) 1773 { 1774 if (gdbserver_state.allow_stop_reply) { 1775 g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); 1776 gdb_append_thread_id(gdbserver_state.c_cpu, gdbserver_state.str_buf); 1777 g_string_append_c(gdbserver_state.str_buf, ';'); 1778 gdb_put_strbuf(); 1779 gdbserver_state.allow_stop_reply = false; 1780 } 1781 /* 1782 * Remove all the breakpoints when this query is issued, 1783 * because gdb is doing an initial connect and the state 1784 * should be cleaned up. 1785 */ 1786 gdb_breakpoint_remove_all(gdbserver_state.c_cpu); 1787 } 1788 1789 static int gdb_handle_packet(const char *line_buf) 1790 { 1791 const GdbCmdParseEntry *cmd_parser = NULL; 1792 1793 trace_gdbstub_io_command(line_buf); 1794 1795 switch (line_buf[0]) { 1796 case '!': 1797 gdb_put_packet("OK"); 1798 break; 1799 case '?': 1800 { 1801 static const GdbCmdParseEntry target_halted_cmd_desc = { 1802 .handler = handle_target_halt, 1803 .cmd = "?", 1804 .cmd_startswith = 1, 1805 .allow_stop_reply = true, 1806 }; 1807 cmd_parser = &target_halted_cmd_desc; 1808 } 1809 break; 1810 case 'c': 1811 { 1812 static const GdbCmdParseEntry continue_cmd_desc = { 1813 .handler = handle_continue, 1814 .cmd = "c", 1815 .cmd_startswith = 1, 1816 .allow_stop_reply = true, 1817 .schema = "L0" 1818 }; 1819 cmd_parser = &continue_cmd_desc; 1820 } 1821 break; 1822 case 'C': 1823 { 1824 static const GdbCmdParseEntry cont_with_sig_cmd_desc = { 1825 .handler = handle_cont_with_sig, 1826 .cmd = "C", 1827 .cmd_startswith = 1, 1828 .allow_stop_reply = true, 1829 .schema = "l0" 1830 }; 1831 cmd_parser = &cont_with_sig_cmd_desc; 1832 } 1833 break; 1834 case 'v': 1835 { 1836 static const GdbCmdParseEntry v_cmd_desc = { 1837 .handler = handle_v_commands, 1838 .cmd = "v", 1839 .cmd_startswith = 1, 1840 .schema = "s0" 1841 }; 1842 cmd_parser = &v_cmd_desc; 1843 } 1844 break; 1845 case 'k': 1846 /* Kill the target */ 1847 error_report("QEMU: Terminated via GDBstub"); 1848 gdb_exit(0); 1849 exit(0); 1850 case 'D': 1851 { 1852 static const GdbCmdParseEntry detach_cmd_desc = { 1853 .handler = handle_detach, 1854 .cmd = "D", 1855 .cmd_startswith = 1, 1856 .schema = "?.l0" 1857 }; 1858 cmd_parser = &detach_cmd_desc; 1859 } 1860 break; 1861 case 's': 1862 { 1863 static const GdbCmdParseEntry step_cmd_desc = { 1864 .handler = handle_step, 1865 .cmd = "s", 1866 .cmd_startswith = 1, 1867 .allow_stop_reply = true, 1868 .schema = "L0" 1869 }; 1870 cmd_parser = &step_cmd_desc; 1871 } 1872 break; 1873 case 'b': 1874 { 1875 static const GdbCmdParseEntry backward_cmd_desc = { 1876 .handler = handle_backward, 1877 .cmd = "b", 1878 .cmd_startswith = 1, 1879 .allow_stop_reply = true, 1880 .schema = "o0" 1881 }; 1882 cmd_parser = &backward_cmd_desc; 1883 } 1884 break; 1885 case 'F': 1886 { 1887 static const GdbCmdParseEntry file_io_cmd_desc = { 1888 .handler = gdb_handle_file_io, 1889 .cmd = "F", 1890 .cmd_startswith = 1, 1891 .schema = "L,L,o0" 1892 }; 1893 cmd_parser = &file_io_cmd_desc; 1894 } 1895 break; 1896 case 'g': 1897 { 1898 static const GdbCmdParseEntry read_all_regs_cmd_desc = { 1899 .handler = handle_read_all_regs, 1900 .cmd = "g", 1901 .cmd_startswith = 1 1902 }; 1903 cmd_parser = &read_all_regs_cmd_desc; 1904 } 1905 break; 1906 case 'G': 1907 { 1908 static const GdbCmdParseEntry write_all_regs_cmd_desc = { 1909 .handler = handle_write_all_regs, 1910 .cmd = "G", 1911 .cmd_startswith = 1, 1912 .schema = "s0" 1913 }; 1914 cmd_parser = &write_all_regs_cmd_desc; 1915 } 1916 break; 1917 case 'm': 1918 { 1919 static const GdbCmdParseEntry read_mem_cmd_desc = { 1920 .handler = handle_read_mem, 1921 .cmd = "m", 1922 .cmd_startswith = 1, 1923 .schema = "L,L0" 1924 }; 1925 cmd_parser = &read_mem_cmd_desc; 1926 } 1927 break; 1928 case 'M': 1929 { 1930 static const GdbCmdParseEntry write_mem_cmd_desc = { 1931 .handler = handle_write_mem, 1932 .cmd = "M", 1933 .cmd_startswith = 1, 1934 .schema = "L,L:s0" 1935 }; 1936 cmd_parser = &write_mem_cmd_desc; 1937 } 1938 break; 1939 case 'p': 1940 { 1941 static const GdbCmdParseEntry get_reg_cmd_desc = { 1942 .handler = handle_get_reg, 1943 .cmd = "p", 1944 .cmd_startswith = 1, 1945 .schema = "L0" 1946 }; 1947 cmd_parser = &get_reg_cmd_desc; 1948 } 1949 break; 1950 case 'P': 1951 { 1952 static const GdbCmdParseEntry set_reg_cmd_desc = { 1953 .handler = handle_set_reg, 1954 .cmd = "P", 1955 .cmd_startswith = 1, 1956 .schema = "L?s0" 1957 }; 1958 cmd_parser = &set_reg_cmd_desc; 1959 } 1960 break; 1961 case 'Z': 1962 { 1963 static const GdbCmdParseEntry insert_bp_cmd_desc = { 1964 .handler = handle_insert_bp, 1965 .cmd = "Z", 1966 .cmd_startswith = 1, 1967 .schema = "l?L?L0" 1968 }; 1969 cmd_parser = &insert_bp_cmd_desc; 1970 } 1971 break; 1972 case 'z': 1973 { 1974 static const GdbCmdParseEntry remove_bp_cmd_desc = { 1975 .handler = handle_remove_bp, 1976 .cmd = "z", 1977 .cmd_startswith = 1, 1978 .schema = "l?L?L0" 1979 }; 1980 cmd_parser = &remove_bp_cmd_desc; 1981 } 1982 break; 1983 case 'H': 1984 { 1985 static const GdbCmdParseEntry set_thread_cmd_desc = { 1986 .handler = handle_set_thread, 1987 .cmd = "H", 1988 .cmd_startswith = 1, 1989 .schema = "o.t0" 1990 }; 1991 cmd_parser = &set_thread_cmd_desc; 1992 } 1993 break; 1994 case 'T': 1995 { 1996 static const GdbCmdParseEntry thread_alive_cmd_desc = { 1997 .handler = handle_thread_alive, 1998 .cmd = "T", 1999 .cmd_startswith = 1, 2000 .schema = "t0" 2001 }; 2002 cmd_parser = &thread_alive_cmd_desc; 2003 } 2004 break; 2005 case 'q': 2006 { 2007 static const GdbCmdParseEntry gen_query_cmd_desc = { 2008 .handler = handle_gen_query, 2009 .cmd = "q", 2010 .cmd_startswith = 1, 2011 .schema = "s0" 2012 }; 2013 cmd_parser = &gen_query_cmd_desc; 2014 } 2015 break; 2016 case 'Q': 2017 { 2018 static const GdbCmdParseEntry gen_set_cmd_desc = { 2019 .handler = handle_gen_set, 2020 .cmd = "Q", 2021 .cmd_startswith = 1, 2022 .schema = "s0" 2023 }; 2024 cmd_parser = &gen_set_cmd_desc; 2025 } 2026 break; 2027 default: 2028 /* put empty packet */ 2029 gdb_put_packet(""); 2030 break; 2031 } 2032 2033 if (cmd_parser) { 2034 run_cmd_parser(line_buf, cmd_parser); 2035 } 2036 2037 return RS_IDLE; 2038 } 2039 2040 void gdb_set_stop_cpu(CPUState *cpu) 2041 { 2042 GDBProcess *p = gdb_get_cpu_process(cpu); 2043 2044 if (!p->attached) { 2045 /* 2046 * Having a stop CPU corresponding to a process that is not attached 2047 * confuses GDB. So we ignore the request. 2048 */ 2049 return; 2050 } 2051 2052 gdbserver_state.c_cpu = cpu; 2053 gdbserver_state.g_cpu = cpu; 2054 } 2055 2056 void gdb_read_byte(uint8_t ch) 2057 { 2058 uint8_t reply; 2059 2060 gdbserver_state.allow_stop_reply = false; 2061 #ifndef CONFIG_USER_ONLY 2062 if (gdbserver_state.last_packet->len) { 2063 /* Waiting for a response to the last packet. If we see the start 2064 of a new command then abandon the previous response. */ 2065 if (ch == '-') { 2066 trace_gdbstub_err_got_nack(); 2067 gdb_put_buffer(gdbserver_state.last_packet->data, 2068 gdbserver_state.last_packet->len); 2069 } else if (ch == '+') { 2070 trace_gdbstub_io_got_ack(); 2071 } else { 2072 trace_gdbstub_io_got_unexpected(ch); 2073 } 2074 2075 if (ch == '+' || ch == '$') { 2076 g_byte_array_set_size(gdbserver_state.last_packet, 0); 2077 } 2078 if (ch != '$') 2079 return; 2080 } 2081 if (runstate_is_running()) { 2082 /* 2083 * When the CPU is running, we cannot do anything except stop 2084 * it when receiving a char. This is expected on a Ctrl-C in the 2085 * gdb client. Because we are in all-stop mode, gdb sends a 2086 * 0x03 byte which is not a usual packet, so we handle it specially 2087 * here, but it does expect a stop reply. 2088 */ 2089 if (ch != 0x03) { 2090 trace_gdbstub_err_unexpected_runpkt(ch); 2091 } else { 2092 gdbserver_state.allow_stop_reply = true; 2093 } 2094 vm_stop(RUN_STATE_PAUSED); 2095 } else 2096 #endif 2097 { 2098 switch(gdbserver_state.state) { 2099 case RS_IDLE: 2100 if (ch == '$') { 2101 /* start of command packet */ 2102 gdbserver_state.line_buf_index = 0; 2103 gdbserver_state.line_sum = 0; 2104 gdbserver_state.state = RS_GETLINE; 2105 } else if (ch == '+') { 2106 /* 2107 * do nothing, gdb may preemptively send out ACKs on 2108 * initial connection 2109 */ 2110 } else { 2111 trace_gdbstub_err_garbage(ch); 2112 } 2113 break; 2114 case RS_GETLINE: 2115 if (ch == '}') { 2116 /* start escape sequence */ 2117 gdbserver_state.state = RS_GETLINE_ESC; 2118 gdbserver_state.line_sum += ch; 2119 } else if (ch == '*') { 2120 /* start run length encoding sequence */ 2121 gdbserver_state.state = RS_GETLINE_RLE; 2122 gdbserver_state.line_sum += ch; 2123 } else if (ch == '#') { 2124 /* end of command, start of checksum*/ 2125 gdbserver_state.state = RS_CHKSUM1; 2126 } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { 2127 trace_gdbstub_err_overrun(); 2128 gdbserver_state.state = RS_IDLE; 2129 } else { 2130 /* unescaped command character */ 2131 gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch; 2132 gdbserver_state.line_sum += ch; 2133 } 2134 break; 2135 case RS_GETLINE_ESC: 2136 if (ch == '#') { 2137 /* unexpected end of command in escape sequence */ 2138 gdbserver_state.state = RS_CHKSUM1; 2139 } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { 2140 /* command buffer overrun */ 2141 trace_gdbstub_err_overrun(); 2142 gdbserver_state.state = RS_IDLE; 2143 } else { 2144 /* parse escaped character and leave escape state */ 2145 gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch ^ 0x20; 2146 gdbserver_state.line_sum += ch; 2147 gdbserver_state.state = RS_GETLINE; 2148 } 2149 break; 2150 case RS_GETLINE_RLE: 2151 /* 2152 * Run-length encoding is explained in "Debugging with GDB / 2153 * Appendix E GDB Remote Serial Protocol / Overview". 2154 */ 2155 if (ch < ' ' || ch == '#' || ch == '$' || ch > 126) { 2156 /* invalid RLE count encoding */ 2157 trace_gdbstub_err_invalid_repeat(ch); 2158 gdbserver_state.state = RS_GETLINE; 2159 } else { 2160 /* decode repeat length */ 2161 int repeat = ch - ' ' + 3; 2162 if (gdbserver_state.line_buf_index + repeat >= sizeof(gdbserver_state.line_buf) - 1) { 2163 /* that many repeats would overrun the command buffer */ 2164 trace_gdbstub_err_overrun(); 2165 gdbserver_state.state = RS_IDLE; 2166 } else if (gdbserver_state.line_buf_index < 1) { 2167 /* got a repeat but we have nothing to repeat */ 2168 trace_gdbstub_err_invalid_rle(); 2169 gdbserver_state.state = RS_GETLINE; 2170 } else { 2171 /* repeat the last character */ 2172 memset(gdbserver_state.line_buf + gdbserver_state.line_buf_index, 2173 gdbserver_state.line_buf[gdbserver_state.line_buf_index - 1], repeat); 2174 gdbserver_state.line_buf_index += repeat; 2175 gdbserver_state.line_sum += ch; 2176 gdbserver_state.state = RS_GETLINE; 2177 } 2178 } 2179 break; 2180 case RS_CHKSUM1: 2181 /* get high hex digit of checksum */ 2182 if (!isxdigit(ch)) { 2183 trace_gdbstub_err_checksum_invalid(ch); 2184 gdbserver_state.state = RS_GETLINE; 2185 break; 2186 } 2187 gdbserver_state.line_buf[gdbserver_state.line_buf_index] = '\0'; 2188 gdbserver_state.line_csum = fromhex(ch) << 4; 2189 gdbserver_state.state = RS_CHKSUM2; 2190 break; 2191 case RS_CHKSUM2: 2192 /* get low hex digit of checksum */ 2193 if (!isxdigit(ch)) { 2194 trace_gdbstub_err_checksum_invalid(ch); 2195 gdbserver_state.state = RS_GETLINE; 2196 break; 2197 } 2198 gdbserver_state.line_csum |= fromhex(ch); 2199 2200 if (gdbserver_state.line_csum != (gdbserver_state.line_sum & 0xff)) { 2201 trace_gdbstub_err_checksum_incorrect(gdbserver_state.line_sum, gdbserver_state.line_csum); 2202 /* send NAK reply */ 2203 reply = '-'; 2204 gdb_put_buffer(&reply, 1); 2205 gdbserver_state.state = RS_IDLE; 2206 } else { 2207 /* send ACK reply */ 2208 reply = '+'; 2209 gdb_put_buffer(&reply, 1); 2210 gdbserver_state.state = gdb_handle_packet(gdbserver_state.line_buf); 2211 } 2212 break; 2213 default: 2214 abort(); 2215 } 2216 } 2217 } 2218 2219 /* 2220 * Create the process that will contain all the "orphan" CPUs (that are not 2221 * part of a CPU cluster). Note that if this process contains no CPUs, it won't 2222 * be attachable and thus will be invisible to the user. 2223 */ 2224 void gdb_create_default_process(GDBState *s) 2225 { 2226 GDBProcess *process; 2227 int pid; 2228 2229 #ifdef CONFIG_USER_ONLY 2230 assert(gdbserver_state.process_num == 0); 2231 pid = getpid(); 2232 #else 2233 if (gdbserver_state.process_num) { 2234 pid = s->processes[s->process_num - 1].pid; 2235 } else { 2236 pid = 0; 2237 } 2238 /* We need an available PID slot for this process */ 2239 assert(pid < UINT32_MAX); 2240 pid++; 2241 #endif 2242 2243 s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); 2244 process = &s->processes[s->process_num - 1]; 2245 process->pid = pid; 2246 process->attached = false; 2247 process->target_xml = NULL; 2248 } 2249 2250