| 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-or-later |
| 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 "qemu/target-info.h" |
| 32 | #include "trace.h" |
| 33 | #include "exec/gdbstub.h" |
| 34 | #include "gdbstub/commands.h" |
| 35 | #include "gdbstub/syscalls.h" |
| 36 | #ifdef CONFIG_USER_ONLY |
| 37 | #include "accel/tcg/vcpu-state.h" |
| 38 | #include "gdbstub/user.h" |
| 39 | #else |
| 40 | #include "hw/cpu/cluster.h" |
| 41 | #include "hw/core/boards.h" |
| 42 | #endif |
| 43 | #include "hw/core/cpu.h" |
| 44 | |
| 45 | #include "system/hw_accel.h" |
| 46 | #include "system/runstate.h" |
| 47 | #include "exec/replay-core.h" |
| 48 | #include "exec/hwaddr.h" |
| 49 | |
| 50 | #include "internals.h" |
| 51 | |
| 52 | typedef struct GDBRegisterState { |
| 53 | int base_reg; |
| 54 | gdb_get_reg_cb get_reg; |
| 55 | gdb_set_reg_cb set_reg; |
| 56 | const GDBFeature *feature; |
| 57 | } GDBRegisterState; |
| 58 | |
| 59 | GDBState gdbserver_state; |
| 60 | |
| 61 | void gdb_init_gdbserver_state(void) |
| 62 | { |
| 63 | g_assert(!gdbserver_state.init); |
| 64 | memset(&gdbserver_state, 0, sizeof(GDBState)); |
| 65 | gdbserver_state.init = true; |
| 66 | gdbserver_state.str_buf = g_string_new(NULL); |
| 67 | gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH); |
| 68 | gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4); |
| 69 | |
| 70 | /* |
| 71 | * What single-step modes are supported is accelerator dependent. |
| 72 | * By default try to use no IRQs and no timers while single |
| 73 | * stepping so as to make single stepping like a typical ICE HW step. |
| 74 | */ |
| 75 | gdbserver_state.accel_config = current_accel()->gdbstub; |
| 76 | gdbserver_state.sstep_flags = SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER; |
| 77 | gdbserver_state.sstep_flags &= gdbserver_state.accel_config.sstep_flags; |
| 78 | } |
| 79 | |
| 80 | /* writes 2*len+1 bytes in buf */ |
| 81 | void gdb_memtohex(GString *buf, const uint8_t *mem, int len) |
| 82 | { |
| 83 | int i, c; |
| 84 | for(i = 0; i < len; i++) { |
| 85 | c = mem[i]; |
| 86 | g_string_append_c(buf, tohex(c >> 4)); |
| 87 | g_string_append_c(buf, tohex(c & 0xf)); |
| 88 | } |
| 89 | g_string_append_c(buf, '\0'); |
| 90 | } |
| 91 | |
| 92 | void gdb_hextomem(GByteArray *mem, const char *buf, int len) |
| 93 | { |
| 94 | int i; |
| 95 | |
| 96 | for(i = 0; i < len; i++) { |
| 97 | guint8 byte = fromhex(buf[0]) << 4 | fromhex(buf[1]); |
| 98 | g_byte_array_append(mem, &byte, 1); |
| 99 | buf += 2; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | static void hexdump(const char *buf, int len, |
| 104 | void (*trace_fn)(size_t ofs, char const *text)) |
| 105 | { |
| 106 | char line_buffer[3 * 16 + 4 + 16 + 1]; |
| 107 | |
| 108 | size_t i; |
| 109 | for (i = 0; i < len || (i & 0xF); ++i) { |
| 110 | size_t byte_ofs = i & 15; |
| 111 | |
| 112 | if (byte_ofs == 0) { |
| 113 | memset(line_buffer, ' ', 3 * 16 + 4 + 16); |
| 114 | line_buffer[3 * 16 + 4 + 16] = 0; |
| 115 | } |
| 116 | |
| 117 | size_t col_group = (i >> 2) & 3; |
| 118 | size_t hex_col = byte_ofs * 3 + col_group; |
| 119 | size_t txt_col = 3 * 16 + 4 + byte_ofs; |
| 120 | |
| 121 | if (i < len) { |
| 122 | char value = buf[i]; |
| 123 | |
| 124 | line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF); |
| 125 | line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF); |
| 126 | line_buffer[txt_col + 0] = (value >= ' ' && value < 127) |
| 127 | ? value |
| 128 | : '.'; |
| 129 | } |
| 130 | |
| 131 | if (byte_ofs == 0xF) |
| 132 | trace_fn(i & -16, line_buffer); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /* return -1 if error, 0 if OK */ |
| 137 | int gdb_put_packet_binary(const char *buf, int len, bool dump) |
| 138 | { |
| 139 | int csum, i; |
| 140 | uint8_t footer[3]; |
| 141 | |
| 142 | if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) { |
| 143 | hexdump(buf, len, trace_gdbstub_io_binaryreply); |
| 144 | } |
| 145 | |
| 146 | for(;;) { |
| 147 | g_byte_array_set_size(gdbserver_state.last_packet, 0); |
| 148 | g_byte_array_append(gdbserver_state.last_packet, |
| 149 | (const uint8_t *) "$", 1); |
| 150 | g_byte_array_append(gdbserver_state.last_packet, |
| 151 | (const uint8_t *) buf, len); |
| 152 | csum = 0; |
| 153 | for(i = 0; i < len; i++) { |
| 154 | csum += buf[i]; |
| 155 | } |
| 156 | footer[0] = '#'; |
| 157 | footer[1] = tohex((csum >> 4) & 0xf); |
| 158 | footer[2] = tohex((csum) & 0xf); |
| 159 | g_byte_array_append(gdbserver_state.last_packet, footer, 3); |
| 160 | |
| 161 | gdb_put_buffer(gdbserver_state.last_packet->data, |
| 162 | gdbserver_state.last_packet->len); |
| 163 | |
| 164 | if (gdb_got_immediate_ack()) { |
| 165 | break; |
| 166 | } |
| 167 | } |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | /* return -1 if error, 0 if OK */ |
| 172 | int gdb_put_packet(const char *buf) |
| 173 | { |
| 174 | trace_gdbstub_io_reply(buf); |
| 175 | |
| 176 | return gdb_put_packet_binary(buf, strlen(buf), false); |
| 177 | } |
| 178 | |
| 179 | void gdb_put_strbuf(void) |
| 180 | { |
| 181 | gdb_put_packet(gdbserver_state.str_buf->str); |
| 182 | } |
| 183 | |
| 184 | /* Encode data using the encoding for 'x' packets. */ |
| 185 | void gdb_memtox(GString *buf, const char *mem, int len) |
| 186 | { |
| 187 | char c; |
| 188 | |
| 189 | while (len--) { |
| 190 | c = *(mem++); |
| 191 | switch (c) { |
| 192 | case '#': case '$': case '*': case '}': |
| 193 | g_string_append_c(buf, '}'); |
| 194 | g_string_append_c(buf, c ^ 0x20); |
| 195 | break; |
| 196 | default: |
| 197 | g_string_append_c(buf, c); |
| 198 | break; |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | static uint32_t gdb_get_cpu_pid(CPUState *cpu) |
| 204 | { |
| 205 | #ifdef CONFIG_USER_ONLY |
| 206 | return getpid(); |
| 207 | #else |
| 208 | if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) { |
| 209 | /* Return the default process' PID */ |
| 210 | int index = gdbserver_state.process_num - 1; |
| 211 | return gdbserver_state.processes[index].pid; |
| 212 | } |
| 213 | return cpu->cluster_index + 1; |
| 214 | #endif |
| 215 | } |
| 216 | |
| 217 | GDBProcess *gdb_get_process(uint32_t pid) |
| 218 | { |
| 219 | int i; |
| 220 | |
| 221 | if (!pid) { |
| 222 | /* 0 means any process, we take the first one */ |
| 223 | return &gdbserver_state.processes[0]; |
| 224 | } |
| 225 | |
| 226 | for (i = 0; i < gdbserver_state.process_num; i++) { |
| 227 | if (gdbserver_state.processes[i].pid == pid) { |
| 228 | return &gdbserver_state.processes[i]; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | return NULL; |
| 233 | } |
| 234 | |
| 235 | static GDBProcess *gdb_get_cpu_process(CPUState *cpu) |
| 236 | { |
| 237 | return gdb_get_process(gdb_get_cpu_pid(cpu)); |
| 238 | } |
| 239 | |
| 240 | static CPUState *find_cpu(uint32_t thread_id) |
| 241 | { |
| 242 | CPUState *cpu; |
| 243 | |
| 244 | CPU_FOREACH(cpu) { |
| 245 | if (gdb_get_cpu_index(cpu) == thread_id) { |
| 246 | return cpu; |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | return NULL; |
| 251 | } |
| 252 | |
| 253 | CPUState *gdb_get_first_cpu_in_process(GDBProcess *process) |
| 254 | { |
| 255 | CPUState *cpu; |
| 256 | |
| 257 | CPU_FOREACH(cpu) { |
| 258 | if (gdb_get_cpu_pid(cpu) == process->pid) { |
| 259 | return cpu; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | return NULL; |
| 264 | } |
| 265 | |
| 266 | static CPUState *gdb_next_cpu_in_process(CPUState *cpu) |
| 267 | { |
| 268 | uint32_t pid = gdb_get_cpu_pid(cpu); |
| 269 | cpu = CPU_NEXT(cpu); |
| 270 | |
| 271 | while (cpu) { |
| 272 | if (gdb_get_cpu_pid(cpu) == pid) { |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | cpu = CPU_NEXT(cpu); |
| 277 | } |
| 278 | |
| 279 | return cpu; |
| 280 | } |
| 281 | |
| 282 | /* Return the cpu following @cpu, while ignoring unattached processes. */ |
| 283 | static CPUState *gdb_next_attached_cpu(CPUState *cpu) |
| 284 | { |
| 285 | cpu = CPU_NEXT(cpu); |
| 286 | |
| 287 | while (cpu) { |
| 288 | if (gdb_get_cpu_process(cpu)->attached) { |
| 289 | break; |
| 290 | } |
| 291 | |
| 292 | cpu = CPU_NEXT(cpu); |
| 293 | } |
| 294 | |
| 295 | return cpu; |
| 296 | } |
| 297 | |
| 298 | /* Return the first attached cpu */ |
| 299 | CPUState *gdb_first_attached_cpu(void) |
| 300 | { |
| 301 | CPUState *cpu = first_cpu; |
| 302 | GDBProcess *process = gdb_get_cpu_process(cpu); |
| 303 | |
| 304 | if (!process->attached) { |
| 305 | return gdb_next_attached_cpu(cpu); |
| 306 | } |
| 307 | |
| 308 | return cpu; |
| 309 | } |
| 310 | |
| 311 | static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid) |
| 312 | { |
| 313 | GDBProcess *process; |
| 314 | CPUState *cpu; |
| 315 | |
| 316 | if (!pid && !tid) { |
| 317 | /* 0 means any process/thread, we take the first attached one */ |
| 318 | return gdb_first_attached_cpu(); |
| 319 | } else if (pid && !tid) { |
| 320 | /* any thread in a specific process */ |
| 321 | process = gdb_get_process(pid); |
| 322 | |
| 323 | if (process == NULL) { |
| 324 | return NULL; |
| 325 | } |
| 326 | |
| 327 | if (!process->attached) { |
| 328 | return NULL; |
| 329 | } |
| 330 | |
| 331 | return gdb_get_first_cpu_in_process(process); |
| 332 | } else { |
| 333 | /* a specific thread */ |
| 334 | cpu = find_cpu(tid); |
| 335 | |
| 336 | if (cpu == NULL) { |
| 337 | return NULL; |
| 338 | } |
| 339 | |
| 340 | process = gdb_get_cpu_process(cpu); |
| 341 | |
| 342 | if (pid && process->pid != pid) { |
| 343 | return NULL; |
| 344 | } |
| 345 | |
| 346 | if (!process->attached) { |
| 347 | return NULL; |
| 348 | } |
| 349 | |
| 350 | return cpu; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | static const char *get_feature_xml(const char *p, const char **newp, |
| 355 | GDBProcess *process) |
| 356 | { |
| 357 | CPUState *cpu = gdb_get_first_cpu_in_process(process); |
| 358 | GDBRegisterState *r; |
| 359 | size_t len; |
| 360 | |
| 361 | /* |
| 362 | * qXfer:features:read:ANNEX:OFFSET,LENGTH' |
| 363 | * ^p ^newp |
| 364 | */ |
| 365 | const char *term = strchr(p, ':'); |
| 366 | *newp = term + 1; |
| 367 | len = term - p; |
| 368 | |
| 369 | /* Is it the main target xml? */ |
| 370 | if (strncmp(p, "target.xml", len) == 0) { |
| 371 | if (!process->target_xml) { |
| 372 | g_autoptr(GPtrArray) xml = g_ptr_array_new_with_free_func(g_free); |
| 373 | |
| 374 | g_ptr_array_add( |
| 375 | xml, |
| 376 | g_strdup("<?xml version=\"1.0\"?>" |
| 377 | "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" |
| 378 | "<target>")); |
| 379 | |
| 380 | if (cpu->cc->gdb_arch_name) { |
| 381 | g_ptr_array_add( |
| 382 | xml, |
| 383 | g_markup_printf_escaped("<architecture>%s</architecture>", |
| 384 | cpu->cc->gdb_arch_name(cpu))); |
| 385 | } |
| 386 | for (guint i = 0; i < cpu->gdb_regs->len; i++) { |
| 387 | r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i); |
| 388 | g_ptr_array_add( |
| 389 | xml, |
| 390 | g_markup_printf_escaped("<xi:include href=\"%s\"/>", |
| 391 | r->feature->xmlname)); |
| 392 | } |
| 393 | g_ptr_array_add(xml, g_strdup("</target>")); |
| 394 | g_ptr_array_add(xml, NULL); |
| 395 | |
| 396 | process->target_xml = g_strjoinv(NULL, (void *)xml->pdata); |
| 397 | } |
| 398 | return process->target_xml; |
| 399 | } |
| 400 | /* Is it one of the features? */ |
| 401 | for (guint i = 0; i < cpu->gdb_regs->len; i++) { |
| 402 | r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i); |
| 403 | if (strncmp(p, r->feature->xmlname, len) == 0) { |
| 404 | return r->feature->xml; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | /* failed */ |
| 409 | return NULL; |
| 410 | } |
| 411 | |
| 412 | void gdb_feature_builder_init(GDBFeatureBuilder *builder, GDBFeature *feature, |
| 413 | const char *name, const char *xmlname, |
| 414 | int base_reg) |
| 415 | { |
| 416 | char *header = g_markup_printf_escaped( |
| 417 | "<?xml version=\"1.0\"?>" |
| 418 | "<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">" |
| 419 | "<feature name=\"%s\">", |
| 420 | name); |
| 421 | |
| 422 | builder->feature = feature; |
| 423 | builder->xml = g_ptr_array_new(); |
| 424 | g_ptr_array_add(builder->xml, header); |
| 425 | builder->regs = g_ptr_array_new(); |
| 426 | builder->base_reg = base_reg; |
| 427 | feature->xmlname = xmlname; |
| 428 | feature->name = name; |
| 429 | } |
| 430 | |
| 431 | void gdb_feature_builder_append_tag(const GDBFeatureBuilder *builder, |
| 432 | const char *format, ...) |
| 433 | { |
| 434 | va_list ap; |
| 435 | va_start(ap, format); |
| 436 | g_ptr_array_add(builder->xml, g_markup_vprintf_escaped(format, ap)); |
| 437 | va_end(ap); |
| 438 | } |
| 439 | |
| 440 | void gdb_feature_builder_append_reg(const GDBFeatureBuilder *builder, |
| 441 | const char *name, |
| 442 | int bitsize, |
| 443 | int regnum, |
| 444 | const char *type, |
| 445 | const char *group) |
| 446 | { |
| 447 | if (builder->regs->len <= regnum) { |
| 448 | g_ptr_array_set_size(builder->regs, regnum + 1); |
| 449 | } |
| 450 | |
| 451 | builder->regs->pdata[regnum] = (gpointer *)name; |
| 452 | |
| 453 | if (group) { |
| 454 | gdb_feature_builder_append_tag( |
| 455 | builder, |
| 456 | "<reg name=\"%s\" bitsize=\"%d\" regnum=\"%d\" type=\"%s\" group=\"%s\"/>", |
| 457 | name, bitsize, builder->base_reg + regnum, type, group); |
| 458 | } else { |
| 459 | gdb_feature_builder_append_tag( |
| 460 | builder, |
| 461 | "<reg name=\"%s\" bitsize=\"%d\" regnum=\"%d\" type=\"%s\"/>", |
| 462 | name, bitsize, builder->base_reg + regnum, type); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | void gdb_feature_builder_end(const GDBFeatureBuilder *builder) |
| 467 | { |
| 468 | g_ptr_array_add(builder->xml, (void *)"</feature>"); |
| 469 | g_ptr_array_add(builder->xml, NULL); |
| 470 | |
| 471 | builder->feature->xml = g_strjoinv(NULL, (void *)builder->xml->pdata); |
| 472 | |
| 473 | for (guint i = 0; i < builder->xml->len - 2; i++) { |
| 474 | g_free(g_ptr_array_index(builder->xml, i)); |
| 475 | } |
| 476 | |
| 477 | g_ptr_array_free(builder->xml, TRUE); |
| 478 | |
| 479 | builder->feature->num_regs = builder->regs->len; |
| 480 | builder->feature->regs = (void *)g_ptr_array_free(builder->regs, FALSE); |
| 481 | trace_gdbxml_feature_builder_header(builder->feature->name, |
| 482 | builder->feature->xmlname, |
| 483 | builder->feature->num_regs); |
| 484 | trace_gdbxml_feature_builder_content(builder->feature->xml); |
| 485 | } |
| 486 | |
| 487 | const GDBFeature *gdb_find_static_feature(const char *xmlname) |
| 488 | { |
| 489 | const GDBFeature *feature; |
| 490 | |
| 491 | for (feature = gdb_static_features; feature->xmlname; feature++) { |
| 492 | if (!strcmp(feature->xmlname, xmlname)) { |
| 493 | return feature; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | g_assert_not_reached(); |
| 498 | } |
| 499 | |
| 500 | GArray *gdb_get_register_list(CPUState *cpu) |
| 501 | { |
| 502 | GArray *results = g_array_new(true, true, sizeof(GDBRegDesc)); |
| 503 | |
| 504 | /* registers are only available once the CPU is initialised */ |
| 505 | if (!cpu->gdb_regs) { |
| 506 | return results; |
| 507 | } |
| 508 | |
| 509 | for (int f = 0; f < cpu->gdb_regs->len; f++) { |
| 510 | GDBRegisterState *r = &g_array_index(cpu->gdb_regs, GDBRegisterState, f); |
| 511 | for (int i = 0; i < r->feature->num_regs; i++) { |
| 512 | const char *name = r->feature->regs[i]; |
| 513 | GDBRegDesc desc = { |
| 514 | r->base_reg + i, |
| 515 | name, |
| 516 | r->feature->name |
| 517 | }; |
| 518 | trace_gdbxml_get_register_list(r->feature->name, |
| 519 | r->feature->xmlname, |
| 520 | r->feature->base_reg, |
| 521 | r->base_reg + i, name); |
| 522 | g_array_append_val(results, desc); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | return results; |
| 527 | } |
| 528 | |
| 529 | int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) |
| 530 | { |
| 531 | GDBRegisterState *r; |
| 532 | |
| 533 | if (reg < cpu->cc->gdb_num_core_regs) { |
| 534 | return cpu->cc->gdb_read_register(cpu, buf, reg); |
| 535 | } |
| 536 | |
| 537 | for (guint i = 0; i < cpu->gdb_regs->len; i++) { |
| 538 | r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i); |
| 539 | if (r->base_reg <= reg && reg < r->base_reg + r->feature->num_regs) { |
| 540 | return r->get_reg(cpu, buf, reg - r->base_reg); |
| 541 | } |
| 542 | } |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) |
| 547 | { |
| 548 | GDBRegisterState *r; |
| 549 | |
| 550 | if (reg < cpu->cc->gdb_num_core_regs) { |
| 551 | return cpu->cc->gdb_write_register(cpu, mem_buf, reg); |
| 552 | } |
| 553 | |
| 554 | for (guint i = 0; i < cpu->gdb_regs->len; i++) { |
| 555 | r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i); |
| 556 | if (r->base_reg <= reg && reg < r->base_reg + r->feature->num_regs) { |
| 557 | return r->set_reg(cpu, mem_buf, reg - r->base_reg); |
| 558 | } |
| 559 | } |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static void gdb_register_feature(CPUState *cpu, int base_reg, |
| 564 | gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg, |
| 565 | const GDBFeature *feature) |
| 566 | { |
| 567 | GDBRegisterState s = { |
| 568 | .base_reg = base_reg, |
| 569 | .get_reg = get_reg, |
| 570 | .set_reg = set_reg, |
| 571 | .feature = feature |
| 572 | }; |
| 573 | |
| 574 | trace_gdbxml_register_feature(feature->name, feature->xmlname, |
| 575 | base_reg, feature->num_regs); |
| 576 | g_array_append_val(cpu->gdb_regs, s); |
| 577 | } |
| 578 | |
| 579 | static const char *gdb_get_core_xml_file(CPUState *cpu) |
| 580 | { |
| 581 | const CPUClass *cc = cpu->cc; |
| 582 | |
| 583 | /* |
| 584 | * The CPU class can provide the XML filename via a method, |
| 585 | * or as a simple fixed string field. |
| 586 | */ |
| 587 | if (cc->gdb_get_core_xml_file) { |
| 588 | return cc->gdb_get_core_xml_file(cpu); |
| 589 | } |
| 590 | return cc->gdb_core_xml_file; |
| 591 | } |
| 592 | |
| 593 | void gdb_init_cpu(CPUState *cpu) |
| 594 | { |
| 595 | const CPUClass *cc = cpu->cc; |
| 596 | const GDBFeature *feature; |
| 597 | const char *xmlfile = gdb_get_core_xml_file(cpu); |
| 598 | |
| 599 | cpu->gdb_regs = g_array_new(false, false, sizeof(GDBRegisterState)); |
| 600 | |
| 601 | if (xmlfile) { |
| 602 | assert(!cc->gdb_num_core_regs); |
| 603 | feature = gdb_find_static_feature(xmlfile); |
| 604 | assert(feature->base_reg == 0); |
| 605 | gdb_register_feature(cpu, 0, |
| 606 | cc->gdb_read_register, cc->gdb_write_register, |
| 607 | feature); |
| 608 | cpu->gdb_num_regs = cpu->gdb_num_g_regs = feature->num_regs; |
| 609 | } else { |
| 610 | cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs; |
| 611 | } |
| 612 | |
| 613 | trace_gdbxml_init_cpu(object_get_typename(OBJECT(cpu)), cpu->cpu_index, |
| 614 | cpu->gdb_num_regs, cpu->gdb_num_g_regs, |
| 615 | cc->gdb_num_core_regs); |
| 616 | } |
| 617 | |
| 618 | void gdb_register_coprocessor(CPUState *cpu, |
| 619 | gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg, |
| 620 | const GDBFeature *feature) |
| 621 | { |
| 622 | GDBRegisterState *s; |
| 623 | guint i; |
| 624 | int base_reg = cpu->gdb_num_regs; |
| 625 | |
| 626 | for (i = 0; i < cpu->gdb_regs->len; i++) { |
| 627 | /* Check for duplicates. */ |
| 628 | s = &g_array_index(cpu->gdb_regs, GDBRegisterState, i); |
| 629 | if (s->feature == feature) { |
| 630 | return; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | if (base_reg < feature->base_reg) { |
| 635 | trace_gdbxml_register_coprocessor_gap(base_reg, |
| 636 | feature->base_reg); |
| 637 | base_reg = feature->base_reg; |
| 638 | } |
| 639 | gdb_register_feature(cpu, base_reg, get_reg, set_reg, feature); |
| 640 | |
| 641 | /* Add to end of list. */ |
| 642 | cpu->gdb_num_regs += feature->num_regs; |
| 643 | } |
| 644 | |
| 645 | void gdb_unregister_coprocessor_all(CPUState *cpu) |
| 646 | { |
| 647 | /* |
| 648 | * Safe to nuke everything. GDBRegisterState::xml is static const char so |
| 649 | * it won't be freed |
| 650 | */ |
| 651 | g_array_free(cpu->gdb_regs, true); |
| 652 | |
| 653 | cpu->gdb_regs = NULL; |
| 654 | cpu->gdb_num_regs = 0; |
| 655 | cpu->gdb_num_g_regs = 0; |
| 656 | } |
| 657 | |
| 658 | static void gdb_process_breakpoint_remove_all(GDBProcess *p) |
| 659 | { |
| 660 | CPUState *cpu = gdb_get_first_cpu_in_process(p); |
| 661 | |
| 662 | while (cpu) { |
| 663 | gdb_breakpoint_remove_all(cpu); |
| 664 | cpu = gdb_next_cpu_in_process(cpu); |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | |
| 669 | static void gdb_set_cpu_pc(vaddr pc) |
| 670 | { |
| 671 | CPUState *cpu = gdbserver_state.c_cpu; |
| 672 | |
| 673 | cpu_synchronize_state(cpu); |
| 674 | cpu_set_pc(cpu, pc); |
| 675 | } |
| 676 | |
| 677 | void gdb_append_thread_id(CPUState *cpu, GString *buf) |
| 678 | { |
| 679 | if (gdbserver_state.multiprocess) { |
| 680 | g_string_append_printf(buf, "p%02x.%02x", |
| 681 | gdb_get_cpu_pid(cpu), gdb_get_cpu_index(cpu)); |
| 682 | } else { |
| 683 | g_string_append_printf(buf, "%02x", gdb_get_cpu_index(cpu)); |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | static GDBThreadIdKind read_thread_id(const char *buf, const char **end_buf, |
| 688 | uint32_t *pid, uint32_t *tid) |
| 689 | { |
| 690 | unsigned long p, t; |
| 691 | int ret; |
| 692 | |
| 693 | if (*buf == 'p') { |
| 694 | buf++; |
| 695 | ret = qemu_strtoul(buf, &buf, 16, &p); |
| 696 | |
| 697 | if (ret) { |
| 698 | return GDB_READ_THREAD_ERR; |
| 699 | } |
| 700 | |
| 701 | /* Skip '.' */ |
| 702 | buf++; |
| 703 | } else { |
| 704 | p = 0; |
| 705 | } |
| 706 | |
| 707 | ret = qemu_strtoul(buf, &buf, 16, &t); |
| 708 | |
| 709 | if (ret) { |
| 710 | return GDB_READ_THREAD_ERR; |
| 711 | } |
| 712 | |
| 713 | *end_buf = buf; |
| 714 | |
| 715 | if (p == -1) { |
| 716 | return GDB_ALL_PROCESSES; |
| 717 | } |
| 718 | |
| 719 | if (pid) { |
| 720 | *pid = p; |
| 721 | } |
| 722 | |
| 723 | if (t == -1) { |
| 724 | return GDB_ALL_THREADS; |
| 725 | } |
| 726 | |
| 727 | if (tid) { |
| 728 | *tid = t; |
| 729 | } |
| 730 | |
| 731 | return GDB_ONE_THREAD; |
| 732 | } |
| 733 | |
| 734 | /** |
| 735 | * gdb_handle_vcont - Parses and handles a vCont packet. |
| 736 | * returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is |
| 737 | * a format error, 0 on success. |
| 738 | */ |
| 739 | static int gdb_handle_vcont(const char *p) |
| 740 | { |
| 741 | int res, signal = 0; |
| 742 | char cur_action; |
| 743 | unsigned long tmp; |
| 744 | uint32_t pid, tid; |
| 745 | GDBProcess *process; |
| 746 | CPUState *cpu; |
| 747 | GDBThreadIdKind kind; |
| 748 | unsigned int max_cpus = gdb_get_max_cpus(); |
| 749 | /* uninitialised CPUs stay 0 */ |
| 750 | g_autofree char *newstates = g_new0(char, max_cpus); |
| 751 | |
| 752 | /* mark valid CPUs with 1 */ |
| 753 | CPU_FOREACH(cpu) { |
| 754 | newstates[cpu->cpu_index] = 1; |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | * res keeps track of what error we are returning, with -ENOTSUP meaning |
| 759 | * that the command is unknown or unsupported, thus returning an empty |
| 760 | * packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid, |
| 761 | * or incorrect parameters passed. |
| 762 | */ |
| 763 | res = 0; |
| 764 | |
| 765 | /* |
| 766 | * target_count and last_target keep track of how many CPUs we are going to |
| 767 | * step or resume, and a pointer to the state structure of one of them, |
| 768 | * respectively |
| 769 | */ |
| 770 | int target_count = 0; |
| 771 | CPUState *last_target = NULL; |
| 772 | |
| 773 | while (*p) { |
| 774 | if (*p++ != ';') { |
| 775 | return -ENOTSUP; |
| 776 | } |
| 777 | |
| 778 | cur_action = *p++; |
| 779 | if (cur_action == 'C' || cur_action == 'S') { |
| 780 | cur_action = qemu_tolower(cur_action); |
| 781 | res = qemu_strtoul(p, &p, 16, &tmp); |
| 782 | if (res) { |
| 783 | return res; |
| 784 | } |
| 785 | signal = gdb_signal_to_target(tmp); |
| 786 | } else if (cur_action != 'c' && cur_action != 's') { |
| 787 | /* unknown/invalid/unsupported command */ |
| 788 | return -ENOTSUP; |
| 789 | } |
| 790 | |
| 791 | if (*p == '\0' || *p == ';') { |
| 792 | /* |
| 793 | * No thread specifier, action is on "all threads". The |
| 794 | * specification is unclear regarding the process to act on. We |
| 795 | * choose all processes. |
| 796 | */ |
| 797 | kind = GDB_ALL_PROCESSES; |
| 798 | } else if (*p++ == ':') { |
| 799 | kind = read_thread_id(p, &p, &pid, &tid); |
| 800 | } else { |
| 801 | return -ENOTSUP; |
| 802 | } |
| 803 | |
| 804 | switch (kind) { |
| 805 | case GDB_READ_THREAD_ERR: |
| 806 | return -EINVAL; |
| 807 | |
| 808 | case GDB_ALL_PROCESSES: |
| 809 | cpu = gdb_first_attached_cpu(); |
| 810 | while (cpu) { |
| 811 | if (newstates[cpu->cpu_index] == 1) { |
| 812 | newstates[cpu->cpu_index] = cur_action; |
| 813 | |
| 814 | target_count++; |
| 815 | last_target = cpu; |
| 816 | } |
| 817 | |
| 818 | cpu = gdb_next_attached_cpu(cpu); |
| 819 | } |
| 820 | break; |
| 821 | |
| 822 | case GDB_ALL_THREADS: |
| 823 | process = gdb_get_process(pid); |
| 824 | |
| 825 | if (!process->attached) { |
| 826 | return -EINVAL; |
| 827 | } |
| 828 | |
| 829 | cpu = gdb_get_first_cpu_in_process(process); |
| 830 | while (cpu) { |
| 831 | if (newstates[cpu->cpu_index] == 1) { |
| 832 | newstates[cpu->cpu_index] = cur_action; |
| 833 | |
| 834 | target_count++; |
| 835 | last_target = cpu; |
| 836 | } |
| 837 | |
| 838 | cpu = gdb_next_cpu_in_process(cpu); |
| 839 | } |
| 840 | break; |
| 841 | |
| 842 | case GDB_ONE_THREAD: |
| 843 | cpu = gdb_get_cpu(pid, tid); |
| 844 | |
| 845 | /* invalid CPU/thread specified */ |
| 846 | if (!cpu) { |
| 847 | return -EINVAL; |
| 848 | } |
| 849 | |
| 850 | /* only use if no previous match occourred */ |
| 851 | if (newstates[cpu->cpu_index] == 1) { |
| 852 | newstates[cpu->cpu_index] = cur_action; |
| 853 | |
| 854 | target_count++; |
| 855 | last_target = cpu; |
| 856 | } |
| 857 | break; |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * if we're about to resume a specific set of CPUs/threads, make it so that |
| 863 | * in case execution gets interrupted, we can send GDB a stop reply with a |
| 864 | * correct value. it doesn't really matter which CPU we tell GDB the signal |
| 865 | * happened in (VM pauses stop all of them anyway), so long as it is one of |
| 866 | * the ones we resumed/single stepped here. |
| 867 | */ |
| 868 | if (target_count > 0) { |
| 869 | gdbserver_state.c_cpu = last_target; |
| 870 | } |
| 871 | |
| 872 | gdbserver_state.signal = signal; |
| 873 | gdb_continue_partial(newstates); |
| 874 | return res; |
| 875 | } |
| 876 | |
| 877 | static const char *cmd_next_param(const char *param, const char delimiter) |
| 878 | { |
| 879 | static const char all_delimiters[] = ",;:="; |
| 880 | char curr_delimiters[2] = {0}; |
| 881 | const char *delimiters; |
| 882 | |
| 883 | if (delimiter == '?') { |
| 884 | delimiters = all_delimiters; |
| 885 | } else if (delimiter == '0') { |
| 886 | return strchr(param, '\0'); |
| 887 | } else if (delimiter == '.' && *param) { |
| 888 | return param + 1; |
| 889 | } else { |
| 890 | curr_delimiters[0] = delimiter; |
| 891 | delimiters = curr_delimiters; |
| 892 | } |
| 893 | |
| 894 | param += strcspn(param, delimiters); |
| 895 | if (*param) { |
| 896 | param++; |
| 897 | } |
| 898 | return param; |
| 899 | } |
| 900 | |
| 901 | static int cmd_parse_params(const char *data, const char *schema, |
| 902 | GArray *params) |
| 903 | { |
| 904 | const char *curr_schema, *curr_data; |
| 905 | |
| 906 | g_assert(schema); |
| 907 | g_assert(params->len == 0); |
| 908 | |
| 909 | curr_schema = schema; |
| 910 | curr_data = data; |
| 911 | while (curr_schema[0] && curr_schema[1] && *curr_data) { |
| 912 | GdbCmdVariant this_param; |
| 913 | |
| 914 | switch (curr_schema[0]) { |
| 915 | case 'l': |
| 916 | if (qemu_strtoul(curr_data, &curr_data, 16, |
| 917 | &this_param.val_ul)) { |
| 918 | return -EINVAL; |
| 919 | } |
| 920 | curr_data = cmd_next_param(curr_data, curr_schema[1]); |
| 921 | g_array_append_val(params, this_param); |
| 922 | break; |
| 923 | case 'L': |
| 924 | if (qemu_strtou64(curr_data, &curr_data, 16, |
| 925 | (uint64_t *)&this_param.val_ull)) { |
| 926 | return -EINVAL; |
| 927 | } |
| 928 | curr_data = cmd_next_param(curr_data, curr_schema[1]); |
| 929 | g_array_append_val(params, this_param); |
| 930 | break; |
| 931 | case 's': |
| 932 | this_param.data = curr_data; |
| 933 | curr_data = cmd_next_param(curr_data, curr_schema[1]); |
| 934 | g_array_append_val(params, this_param); |
| 935 | break; |
| 936 | case 'o': |
| 937 | this_param.opcode = *(uint8_t *)curr_data; |
| 938 | curr_data = cmd_next_param(curr_data, curr_schema[1]); |
| 939 | g_array_append_val(params, this_param); |
| 940 | break; |
| 941 | case 't': |
| 942 | this_param.thread_id.kind = |
| 943 | read_thread_id(curr_data, &curr_data, |
| 944 | &this_param.thread_id.pid, |
| 945 | &this_param.thread_id.tid); |
| 946 | curr_data = cmd_next_param(curr_data, curr_schema[1]); |
| 947 | g_array_append_val(params, this_param); |
| 948 | break; |
| 949 | case '?': |
| 950 | curr_data = cmd_next_param(curr_data, curr_schema[1]); |
| 951 | break; |
| 952 | default: |
| 953 | return -EINVAL; |
| 954 | } |
| 955 | curr_schema += 2; |
| 956 | } |
| 957 | |
| 958 | return 0; |
| 959 | } |
| 960 | |
| 961 | static inline int startswith(const char *string, const char *pattern) |
| 962 | { |
| 963 | return !strncmp(string, pattern, strlen(pattern)); |
| 964 | } |
| 965 | |
| 966 | static bool process_string_cmd(const char *data, |
| 967 | const GdbCmdParseEntry *cmds, int num_cmds) |
| 968 | { |
| 969 | int i; |
| 970 | g_autoptr(GArray) params = g_array_new(false, true, sizeof(GdbCmdVariant)); |
| 971 | |
| 972 | if (!cmds) { |
| 973 | return false; |
| 974 | } |
| 975 | |
| 976 | for (i = 0; i < num_cmds; i++) { |
| 977 | const GdbCmdParseEntry *cmd = &cmds[i]; |
| 978 | void *user_ctx = NULL; |
| 979 | g_assert(cmd->handler && cmd->cmd); |
| 980 | |
| 981 | if ((cmd->cmd_startswith && !startswith(data, cmd->cmd)) || |
| 982 | (!cmd->cmd_startswith && strcmp(cmd->cmd, data))) { |
| 983 | continue; |
| 984 | } |
| 985 | |
| 986 | if (cmd->schema) { |
| 987 | if (cmd_parse_params(&data[strlen(cmd->cmd)], |
| 988 | cmd->schema, params)) { |
| 989 | return false; |
| 990 | } |
| 991 | } |
| 992 | |
| 993 | if (cmd->need_cpu_context) { |
| 994 | user_ctx = (void *)gdbserver_state.g_cpu; |
| 995 | } |
| 996 | |
| 997 | gdbserver_state.allow_stop_reply = cmd->allow_stop_reply; |
| 998 | cmd->handler(params, user_ctx); |
| 999 | return true; |
| 1000 | } |
| 1001 | |
| 1002 | return false; |
| 1003 | } |
| 1004 | |
| 1005 | static void run_cmd_parser(const char *data, const GdbCmdParseEntry *cmd) |
| 1006 | { |
| 1007 | if (!data) { |
| 1008 | return; |
| 1009 | } |
| 1010 | |
| 1011 | g_string_set_size(gdbserver_state.str_buf, 0); |
| 1012 | g_byte_array_set_size(gdbserver_state.mem_buf, 0); |
| 1013 | |
| 1014 | /* In case there was an error during the command parsing we must |
| 1015 | * send a NULL packet to indicate the command is not supported */ |
| 1016 | if (!process_string_cmd(data, cmd, 1)) { |
| 1017 | gdb_put_packet(""); |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | static void handle_detach(GArray *params, void *user_ctx) |
| 1022 | { |
| 1023 | GDBProcess *process; |
| 1024 | uint32_t pid = 1; |
| 1025 | |
| 1026 | if (gdbserver_state.multiprocess) { |
| 1027 | if (!params->len) { |
| 1028 | gdb_put_packet("E22"); |
| 1029 | return; |
| 1030 | } |
| 1031 | |
| 1032 | pid = gdb_get_cmd_param(params, 0)->val_ul; |
| 1033 | } |
| 1034 | |
| 1035 | #ifdef CONFIG_USER_ONLY |
| 1036 | if (gdb_handle_detach_user(pid)) { |
| 1037 | return; |
| 1038 | } |
| 1039 | #endif |
| 1040 | |
| 1041 | process = gdb_get_process(pid); |
| 1042 | gdb_process_breakpoint_remove_all(process); |
| 1043 | process->attached = false; |
| 1044 | |
| 1045 | if (pid == gdb_get_cpu_pid(gdbserver_state.c_cpu)) { |
| 1046 | gdbserver_state.c_cpu = gdb_first_attached_cpu(); |
| 1047 | } |
| 1048 | |
| 1049 | if (pid == gdb_get_cpu_pid(gdbserver_state.g_cpu)) { |
| 1050 | gdbserver_state.g_cpu = gdb_first_attached_cpu(); |
| 1051 | } |
| 1052 | |
| 1053 | if (!gdbserver_state.c_cpu) { |
| 1054 | /* No more process attached */ |
| 1055 | gdb_disable_syscalls(); |
| 1056 | gdb_continue(); |
| 1057 | } |
| 1058 | gdb_put_packet("OK"); |
| 1059 | } |
| 1060 | |
| 1061 | static void handle_thread_alive(GArray *params, void *user_ctx) |
| 1062 | { |
| 1063 | CPUState *cpu; |
| 1064 | |
| 1065 | if (!params->len) { |
| 1066 | gdb_put_packet("E22"); |
| 1067 | return; |
| 1068 | } |
| 1069 | |
| 1070 | if (gdb_get_cmd_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) { |
| 1071 | gdb_put_packet("E22"); |
| 1072 | return; |
| 1073 | } |
| 1074 | |
| 1075 | cpu = gdb_get_cpu(gdb_get_cmd_param(params, 0)->thread_id.pid, |
| 1076 | gdb_get_cmd_param(params, 0)->thread_id.tid); |
| 1077 | if (!cpu) { |
| 1078 | gdb_put_packet("E22"); |
| 1079 | return; |
| 1080 | } |
| 1081 | |
| 1082 | gdb_put_packet("OK"); |
| 1083 | } |
| 1084 | |
| 1085 | static void handle_continue(GArray *params, void *user_ctx) |
| 1086 | { |
| 1087 | if (params->len) { |
| 1088 | gdb_set_cpu_pc(gdb_get_cmd_param(params, 0)->val_ull); |
| 1089 | } |
| 1090 | |
| 1091 | gdbserver_state.signal = 0; |
| 1092 | gdb_continue(); |
| 1093 | } |
| 1094 | |
| 1095 | static void handle_cont_with_sig(GArray *params, void *user_ctx) |
| 1096 | { |
| 1097 | unsigned long signal = 0; |
| 1098 | |
| 1099 | /* |
| 1100 | * Note: C sig;[addr] is currently unsupported and we simply |
| 1101 | * omit the addr parameter |
| 1102 | */ |
| 1103 | if (params->len) { |
| 1104 | signal = gdb_get_cmd_param(params, 0)->val_ul; |
| 1105 | } |
| 1106 | |
| 1107 | gdbserver_state.signal = gdb_signal_to_target(signal); |
| 1108 | if (gdbserver_state.signal == -1) { |
| 1109 | gdbserver_state.signal = 0; |
| 1110 | } |
| 1111 | gdb_continue(); |
| 1112 | } |
| 1113 | |
| 1114 | static void handle_set_thread(GArray *params, void *user_ctx) |
| 1115 | { |
| 1116 | uint32_t pid, tid; |
| 1117 | CPUState *cpu; |
| 1118 | |
| 1119 | if (params->len != 2) { |
| 1120 | gdb_put_packet("E22"); |
| 1121 | return; |
| 1122 | } |
| 1123 | |
| 1124 | if (gdb_get_cmd_param(params, 1)->thread_id.kind == GDB_READ_THREAD_ERR) { |
| 1125 | gdb_put_packet("E22"); |
| 1126 | return; |
| 1127 | } |
| 1128 | |
| 1129 | if (gdb_get_cmd_param(params, 1)->thread_id.kind != GDB_ONE_THREAD) { |
| 1130 | gdb_put_packet("OK"); |
| 1131 | return; |
| 1132 | } |
| 1133 | |
| 1134 | pid = gdb_get_cmd_param(params, 1)->thread_id.pid; |
| 1135 | tid = gdb_get_cmd_param(params, 1)->thread_id.tid; |
| 1136 | #ifdef CONFIG_USER_ONLY |
| 1137 | if (gdb_handle_set_thread_user(pid, tid)) { |
| 1138 | return; |
| 1139 | } |
| 1140 | #endif |
| 1141 | cpu = gdb_get_cpu(pid, tid); |
| 1142 | if (!cpu) { |
| 1143 | gdb_put_packet("E22"); |
| 1144 | return; |
| 1145 | } |
| 1146 | |
| 1147 | /* |
| 1148 | * Note: This command is deprecated and modern gdb's will be using the |
| 1149 | * vCont command instead. |
| 1150 | */ |
| 1151 | switch (gdb_get_cmd_param(params, 0)->opcode) { |
| 1152 | case 'c': |
| 1153 | gdbserver_state.c_cpu = cpu; |
| 1154 | gdb_put_packet("OK"); |
| 1155 | break; |
| 1156 | case 'g': |
| 1157 | gdbserver_state.g_cpu = cpu; |
| 1158 | gdb_put_packet("OK"); |
| 1159 | break; |
| 1160 | default: |
| 1161 | gdb_put_packet("E22"); |
| 1162 | break; |
| 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | static void handle_insert_bp(GArray *params, void *user_ctx) |
| 1167 | { |
| 1168 | int res; |
| 1169 | |
| 1170 | if (params->len != 3) { |
| 1171 | gdb_put_packet("E22"); |
| 1172 | return; |
| 1173 | } |
| 1174 | |
| 1175 | res = gdb_breakpoint_insert(gdbserver_state.c_cpu, |
| 1176 | gdb_get_cmd_param(params, 0)->val_ul, |
| 1177 | gdb_get_cmd_param(params, 1)->val_ull, |
| 1178 | gdb_get_cmd_param(params, 2)->val_ull); |
| 1179 | if (res >= 0) { |
| 1180 | gdb_put_packet("OK"); |
| 1181 | return; |
| 1182 | } else if (res == -ENOSYS) { |
| 1183 | gdb_put_packet(""); |
| 1184 | return; |
| 1185 | } |
| 1186 | |
| 1187 | gdb_put_packet("E22"); |
| 1188 | } |
| 1189 | |
| 1190 | static void handle_remove_bp(GArray *params, void *user_ctx) |
| 1191 | { |
| 1192 | int res; |
| 1193 | |
| 1194 | if (params->len != 3) { |
| 1195 | gdb_put_packet("E22"); |
| 1196 | return; |
| 1197 | } |
| 1198 | |
| 1199 | res = gdb_breakpoint_remove(gdbserver_state.c_cpu, |
| 1200 | gdb_get_cmd_param(params, 0)->val_ul, |
| 1201 | gdb_get_cmd_param(params, 1)->val_ull, |
| 1202 | gdb_get_cmd_param(params, 2)->val_ull); |
| 1203 | if (res >= 0) { |
| 1204 | gdb_put_packet("OK"); |
| 1205 | return; |
| 1206 | } else if (res == -ENOSYS) { |
| 1207 | gdb_put_packet(""); |
| 1208 | return; |
| 1209 | } |
| 1210 | |
| 1211 | gdb_put_packet("E22"); |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * handle_set/get_reg |
| 1216 | * |
| 1217 | * Older gdb are really dumb, and don't use 'G/g' if 'P/p' is available. |
| 1218 | * This works, but can be very slow. Anything new enough to understand |
| 1219 | * XML also knows how to use this properly. However to use this we |
| 1220 | * need to define a local XML file as well as be talking to a |
| 1221 | * reasonably modern gdb. Responding with an empty packet will cause |
| 1222 | * the remote gdb to fallback to older methods. |
| 1223 | */ |
| 1224 | |
| 1225 | static void handle_set_reg(GArray *params, void *user_ctx) |
| 1226 | { |
| 1227 | int reg_size; |
| 1228 | |
| 1229 | if (params->len != 2) { |
| 1230 | gdb_put_packet("E22"); |
| 1231 | return; |
| 1232 | } |
| 1233 | |
| 1234 | reg_size = strlen(gdb_get_cmd_param(params, 1)->data) / 2; |
| 1235 | gdb_hextomem(gdbserver_state.mem_buf, gdb_get_cmd_param(params, 1)->data, reg_size); |
| 1236 | gdb_write_register(gdbserver_state.g_cpu, gdbserver_state.mem_buf->data, |
| 1237 | gdb_get_cmd_param(params, 0)->val_ull); |
| 1238 | gdb_put_packet("OK"); |
| 1239 | } |
| 1240 | |
| 1241 | static void handle_get_reg(GArray *params, void *user_ctx) |
| 1242 | { |
| 1243 | int reg_size; |
| 1244 | |
| 1245 | if (!params->len) { |
| 1246 | gdb_put_packet("E14"); |
| 1247 | return; |
| 1248 | } |
| 1249 | |
| 1250 | reg_size = gdb_read_register(gdbserver_state.g_cpu, |
| 1251 | gdbserver_state.mem_buf, |
| 1252 | gdb_get_cmd_param(params, 0)->val_ull); |
| 1253 | if (!reg_size) { |
| 1254 | gdb_put_packet("E14"); |
| 1255 | return; |
| 1256 | } else { |
| 1257 | g_byte_array_set_size(gdbserver_state.mem_buf, reg_size); |
| 1258 | } |
| 1259 | |
| 1260 | gdb_memtohex(gdbserver_state.str_buf, |
| 1261 | gdbserver_state.mem_buf->data, reg_size); |
| 1262 | gdb_put_strbuf(); |
| 1263 | } |
| 1264 | |
| 1265 | static void handle_write_mem(GArray *params, void *user_ctx) |
| 1266 | { |
| 1267 | if (params->len != 3) { |
| 1268 | gdb_put_packet("E22"); |
| 1269 | return; |
| 1270 | } |
| 1271 | |
| 1272 | /* gdb_hextomem() reads 2*len bytes */ |
| 1273 | if (gdb_get_cmd_param(params, 1)->val_ull > |
| 1274 | strlen(gdb_get_cmd_param(params, 2)->data) / 2) { |
| 1275 | gdb_put_packet("E22"); |
| 1276 | return; |
| 1277 | } |
| 1278 | |
| 1279 | gdb_hextomem(gdbserver_state.mem_buf, gdb_get_cmd_param(params, 2)->data, |
| 1280 | gdb_get_cmd_param(params, 1)->val_ull); |
| 1281 | if (gdb_target_memory_rw_debug(gdbserver_state.g_cpu, |
| 1282 | gdb_get_cmd_param(params, 0)->val_ull, |
| 1283 | gdbserver_state.mem_buf->data, |
| 1284 | gdbserver_state.mem_buf->len, true)) { |
| 1285 | gdb_put_packet("E14"); |
| 1286 | return; |
| 1287 | } |
| 1288 | |
| 1289 | gdb_put_packet("OK"); |
| 1290 | } |
| 1291 | |
| 1292 | static void handle_read_mem(GArray *params, void *user_ctx) |
| 1293 | { |
| 1294 | if (params->len != 2) { |
| 1295 | gdb_put_packet("E22"); |
| 1296 | return; |
| 1297 | } |
| 1298 | |
| 1299 | /* gdb_memtohex() doubles the required space */ |
| 1300 | if (gdb_get_cmd_param(params, 1)->val_ull > MAX_PACKET_LENGTH / 2) { |
| 1301 | gdb_put_packet("E22"); |
| 1302 | return; |
| 1303 | } |
| 1304 | |
| 1305 | g_byte_array_set_size(gdbserver_state.mem_buf, |
| 1306 | gdb_get_cmd_param(params, 1)->val_ull); |
| 1307 | |
| 1308 | if (gdb_target_memory_rw_debug(gdbserver_state.g_cpu, |
| 1309 | gdb_get_cmd_param(params, 0)->val_ull, |
| 1310 | gdbserver_state.mem_buf->data, |
| 1311 | gdbserver_state.mem_buf->len, false)) { |
| 1312 | gdb_put_packet("E14"); |
| 1313 | return; |
| 1314 | } |
| 1315 | |
| 1316 | gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, |
| 1317 | gdbserver_state.mem_buf->len); |
| 1318 | gdb_put_strbuf(); |
| 1319 | } |
| 1320 | |
| 1321 | static void handle_write_all_regs(GArray *params, void *user_ctx) |
| 1322 | { |
| 1323 | int reg_id; |
| 1324 | size_t len; |
| 1325 | uint8_t *registers; |
| 1326 | int reg_size; |
| 1327 | |
| 1328 | if (!params->len) { |
| 1329 | return; |
| 1330 | } |
| 1331 | |
| 1332 | cpu_synchronize_state(gdbserver_state.g_cpu); |
| 1333 | len = strlen(gdb_get_cmd_param(params, 0)->data) / 2; |
| 1334 | gdb_hextomem(gdbserver_state.mem_buf, gdb_get_cmd_param(params, 0)->data, len); |
| 1335 | registers = gdbserver_state.mem_buf->data; |
| 1336 | for (reg_id = 0; |
| 1337 | reg_id < gdbserver_state.g_cpu->gdb_num_g_regs && len > 0; |
| 1338 | reg_id++) { |
| 1339 | reg_size = gdb_write_register(gdbserver_state.g_cpu, registers, reg_id); |
| 1340 | len -= reg_size; |
| 1341 | registers += reg_size; |
| 1342 | } |
| 1343 | gdb_put_packet("OK"); |
| 1344 | } |
| 1345 | |
| 1346 | static void handle_read_all_regs(GArray *params, void *user_ctx) |
| 1347 | { |
| 1348 | int reg_id; |
| 1349 | size_t len; |
| 1350 | |
| 1351 | cpu_synchronize_state(gdbserver_state.g_cpu); |
| 1352 | g_byte_array_set_size(gdbserver_state.mem_buf, 0); |
| 1353 | len = 0; |
| 1354 | for (reg_id = 0; reg_id < gdbserver_state.g_cpu->gdb_num_g_regs; reg_id++) { |
| 1355 | len += gdb_read_register(gdbserver_state.g_cpu, |
| 1356 | gdbserver_state.mem_buf, |
| 1357 | reg_id); |
| 1358 | g_assert(len == gdbserver_state.mem_buf->len); |
| 1359 | } |
| 1360 | |
| 1361 | gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len); |
| 1362 | gdb_put_strbuf(); |
| 1363 | } |
| 1364 | |
| 1365 | |
| 1366 | static void handle_step(GArray *params, void *user_ctx) |
| 1367 | { |
| 1368 | if (params->len) { |
| 1369 | gdb_set_cpu_pc(gdb_get_cmd_param(params, 0)->val_ull); |
| 1370 | } |
| 1371 | |
| 1372 | trace_gdbstub_op_stepping(gdbserver_state.c_cpu->cpu_index); |
| 1373 | cpu_single_step(gdbserver_state.c_cpu, gdbserver_state.sstep_flags); |
| 1374 | gdb_continue(); |
| 1375 | } |
| 1376 | |
| 1377 | static void handle_backward(GArray *params, void *user_ctx) |
| 1378 | { |
| 1379 | if (!gdbserver_state.accel_config.can_reverse) { |
| 1380 | gdb_put_packet("E22"); |
| 1381 | return; |
| 1382 | } |
| 1383 | if (params->len == 1) { |
| 1384 | switch (gdb_get_cmd_param(params, 0)->opcode) { |
| 1385 | case 's': |
| 1386 | if (replay_reverse_step()) { |
| 1387 | gdb_continue(); |
| 1388 | } else { |
| 1389 | gdb_put_packet("E14"); |
| 1390 | } |
| 1391 | return; |
| 1392 | case 'c': |
| 1393 | if (replay_reverse_continue()) { |
| 1394 | gdb_continue(); |
| 1395 | } else { |
| 1396 | gdb_put_packet("E14"); |
| 1397 | } |
| 1398 | return; |
| 1399 | } |
| 1400 | } |
| 1401 | |
| 1402 | /* Default invalid command */ |
| 1403 | gdb_put_packet(""); |
| 1404 | } |
| 1405 | |
| 1406 | static void handle_v_cont_query(GArray *params, void *user_ctx) |
| 1407 | { |
| 1408 | gdb_put_packet("vCont;c;C;s;S"); |
| 1409 | } |
| 1410 | |
| 1411 | static void handle_v_cont(GArray *params, void *user_ctx) |
| 1412 | { |
| 1413 | int res; |
| 1414 | |
| 1415 | if (!params->len) { |
| 1416 | return; |
| 1417 | } |
| 1418 | |
| 1419 | res = gdb_handle_vcont(gdb_get_cmd_param(params, 0)->data); |
| 1420 | if ((res == -EINVAL) || (res == -ERANGE)) { |
| 1421 | gdb_put_packet("E22"); |
| 1422 | } else if (res) { |
| 1423 | gdb_put_packet(""); |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | static void handle_v_attach(GArray *params, void *user_ctx) |
| 1428 | { |
| 1429 | GDBProcess *process = NULL; |
| 1430 | CPUState *cpu = NULL; |
| 1431 | |
| 1432 | /* Default error reply */ |
| 1433 | g_string_assign(gdbserver_state.str_buf, "E22"); |
| 1434 | if (params->len) { |
| 1435 | process = gdb_get_process(gdb_get_cmd_param(params, 0)->val_ul); |
| 1436 | } |
| 1437 | |
| 1438 | if (process) { |
| 1439 | cpu = gdb_get_first_cpu_in_process(process); |
| 1440 | } |
| 1441 | |
| 1442 | if (cpu) { |
| 1443 | process->attached = true; |
| 1444 | gdbserver_state.g_cpu = cpu; |
| 1445 | gdbserver_state.c_cpu = cpu; |
| 1446 | |
| 1447 | if (gdbserver_state.allow_stop_reply) { |
| 1448 | gdb_build_stop_packet(gdbserver_state.str_buf, cpu); |
| 1449 | gdbserver_state.allow_stop_reply = false; |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | gdb_put_strbuf(); |
| 1454 | } |
| 1455 | |
| 1456 | static void handle_v_kill(GArray *params, void *user_ctx) |
| 1457 | { |
| 1458 | /* Kill the target */ |
| 1459 | gdb_put_packet("OK"); |
| 1460 | error_report("QEMU: Terminated via GDBstub"); |
| 1461 | gdb_exit(0); |
| 1462 | gdb_qemu_exit(0); |
| 1463 | } |
| 1464 | |
| 1465 | static const GdbCmdParseEntry gdb_v_commands_table[] = { |
| 1466 | /* Order is important if has same prefix */ |
| 1467 | { |
| 1468 | .handler = handle_v_cont_query, |
| 1469 | .cmd = "Cont?", |
| 1470 | .cmd_startswith = true |
| 1471 | }, |
| 1472 | { |
| 1473 | .handler = handle_v_cont, |
| 1474 | .cmd = "Cont", |
| 1475 | .cmd_startswith = true, |
| 1476 | .allow_stop_reply = true, |
| 1477 | .schema = "s0" |
| 1478 | }, |
| 1479 | { |
| 1480 | .handler = handle_v_attach, |
| 1481 | .cmd = "Attach;", |
| 1482 | .cmd_startswith = true, |
| 1483 | .allow_stop_reply = true, |
| 1484 | .schema = "l0" |
| 1485 | }, |
| 1486 | { |
| 1487 | .handler = handle_v_kill, |
| 1488 | .cmd = "Kill;", |
| 1489 | .cmd_startswith = true |
| 1490 | }, |
| 1491 | #ifdef CONFIG_USER_ONLY |
| 1492 | /* |
| 1493 | * Host I/O Packets. See [1] for details. |
| 1494 | * [1] https://sourceware.org/gdb/onlinedocs/gdb/Host-I_002fO-Packets.html |
| 1495 | */ |
| 1496 | { |
| 1497 | .handler = gdb_handle_v_file_open, |
| 1498 | .cmd = "File:open:", |
| 1499 | .cmd_startswith = true, |
| 1500 | .schema = "s,L,L0" |
| 1501 | }, |
| 1502 | { |
| 1503 | .handler = gdb_handle_v_file_close, |
| 1504 | .cmd = "File:close:", |
| 1505 | .cmd_startswith = true, |
| 1506 | .schema = "l0" |
| 1507 | }, |
| 1508 | { |
| 1509 | .handler = gdb_handle_v_file_pread, |
| 1510 | .cmd = "File:pread:", |
| 1511 | .cmd_startswith = true, |
| 1512 | .schema = "l,L,L0" |
| 1513 | }, |
| 1514 | { |
| 1515 | .handler = gdb_handle_v_file_readlink, |
| 1516 | .cmd = "File:readlink:", |
| 1517 | .cmd_startswith = true, |
| 1518 | .schema = "s0" |
| 1519 | }, |
| 1520 | #endif |
| 1521 | }; |
| 1522 | |
| 1523 | static void handle_v_commands(GArray *params, void *user_ctx) |
| 1524 | { |
| 1525 | if (!params->len) { |
| 1526 | return; |
| 1527 | } |
| 1528 | |
| 1529 | if (!process_string_cmd(gdb_get_cmd_param(params, 0)->data, |
| 1530 | gdb_v_commands_table, |
| 1531 | ARRAY_SIZE(gdb_v_commands_table))) { |
| 1532 | gdb_put_packet(""); |
| 1533 | } |
| 1534 | } |
| 1535 | |
| 1536 | static void handle_query_qemu_sstepbits(GArray *params, void *user_ctx) |
| 1537 | { |
| 1538 | g_string_printf(gdbserver_state.str_buf, "ENABLE=%x", SSTEP_ENABLE); |
| 1539 | |
| 1540 | if (gdbserver_state.accel_config.sstep_flags & SSTEP_NOIRQ) { |
| 1541 | g_string_append_printf(gdbserver_state.str_buf, ",NOIRQ=%x", |
| 1542 | SSTEP_NOIRQ); |
| 1543 | } |
| 1544 | |
| 1545 | if (gdbserver_state.accel_config.sstep_flags & SSTEP_NOTIMER) { |
| 1546 | g_string_append_printf(gdbserver_state.str_buf, ",NOTIMER=%x", |
| 1547 | SSTEP_NOTIMER); |
| 1548 | } |
| 1549 | |
| 1550 | gdb_put_strbuf(); |
| 1551 | } |
| 1552 | |
| 1553 | static void handle_set_qemu_sstep(GArray *params, void *user_ctx) |
| 1554 | { |
| 1555 | int new_sstep_flags; |
| 1556 | |
| 1557 | if (!params->len) { |
| 1558 | return; |
| 1559 | } |
| 1560 | |
| 1561 | new_sstep_flags = gdb_get_cmd_param(params, 0)->val_ul; |
| 1562 | |
| 1563 | if (new_sstep_flags & ~gdbserver_state.accel_config.sstep_flags) { |
| 1564 | gdb_put_packet("E22"); |
| 1565 | return; |
| 1566 | } |
| 1567 | |
| 1568 | gdbserver_state.sstep_flags = new_sstep_flags; |
| 1569 | gdb_put_packet("OK"); |
| 1570 | } |
| 1571 | |
| 1572 | static void handle_query_qemu_sstep(GArray *params, void *user_ctx) |
| 1573 | { |
| 1574 | g_string_printf(gdbserver_state.str_buf, "0x%x", |
| 1575 | gdbserver_state.sstep_flags); |
| 1576 | gdb_put_strbuf(); |
| 1577 | } |
| 1578 | |
| 1579 | static void handle_query_curr_tid(GArray *params, void *user_ctx) |
| 1580 | { |
| 1581 | CPUState *cpu; |
| 1582 | GDBProcess *process; |
| 1583 | |
| 1584 | /* |
| 1585 | * "Current thread" remains vague in the spec, so always return |
| 1586 | * the first thread of the current process (gdb returns the |
| 1587 | * first thread). |
| 1588 | */ |
| 1589 | process = gdb_get_cpu_process(gdbserver_state.g_cpu); |
| 1590 | cpu = gdb_get_first_cpu_in_process(process); |
| 1591 | g_string_assign(gdbserver_state.str_buf, "QC"); |
| 1592 | gdb_append_thread_id(cpu, gdbserver_state.str_buf); |
| 1593 | gdb_put_strbuf(); |
| 1594 | } |
| 1595 | |
| 1596 | static void handle_query_threads(GArray *params, void *user_ctx) |
| 1597 | { |
| 1598 | if (!gdbserver_state.query_cpu) { |
| 1599 | gdb_put_packet("l"); |
| 1600 | return; |
| 1601 | } |
| 1602 | |
| 1603 | g_string_assign(gdbserver_state.str_buf, "m"); |
| 1604 | gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf); |
| 1605 | gdb_put_strbuf(); |
| 1606 | gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu); |
| 1607 | } |
| 1608 | |
| 1609 | static void handle_query_gdb_server_version(GArray *params, void *user_ctx) |
| 1610 | { |
| 1611 | #if defined(CONFIG_USER_ONLY) |
| 1612 | g_string_printf(gdbserver_state.str_buf, "name:qemu-%s;version:%s;", |
| 1613 | target_name(), QEMU_VERSION); |
| 1614 | #else |
| 1615 | g_string_printf(gdbserver_state.str_buf, "name:qemu-system-%s;version:%s;", |
| 1616 | target_name(), QEMU_VERSION); |
| 1617 | #endif |
| 1618 | gdb_put_strbuf(); |
| 1619 | } |
| 1620 | |
| 1621 | static void handle_query_first_threads(GArray *params, void *user_ctx) |
| 1622 | { |
| 1623 | gdbserver_state.query_cpu = gdb_first_attached_cpu(); |
| 1624 | handle_query_threads(params, user_ctx); |
| 1625 | } |
| 1626 | |
| 1627 | static void handle_query_thread_extra(GArray *params, void *user_ctx) |
| 1628 | { |
| 1629 | g_autoptr(GString) rs = g_string_new(NULL); |
| 1630 | CPUState *cpu; |
| 1631 | |
| 1632 | if (!params->len || |
| 1633 | gdb_get_cmd_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) { |
| 1634 | gdb_put_packet("E22"); |
| 1635 | return; |
| 1636 | } |
| 1637 | |
| 1638 | cpu = gdb_get_cpu(gdb_get_cmd_param(params, 0)->thread_id.pid, |
| 1639 | gdb_get_cmd_param(params, 0)->thread_id.tid); |
| 1640 | if (!cpu) { |
| 1641 | return; |
| 1642 | } |
| 1643 | |
| 1644 | cpu_synchronize_state(cpu); |
| 1645 | |
| 1646 | if (gdbserver_state.multiprocess && (gdbserver_state.process_num > 1)) { |
| 1647 | /* Print the CPU model and name in multiprocess mode */ |
| 1648 | ObjectClass *oc = object_get_class(OBJECT(cpu)); |
| 1649 | const char *cpu_model = object_class_get_name(oc); |
| 1650 | const char *cpu_name = |
| 1651 | object_get_canonical_path_component(OBJECT(cpu)); |
| 1652 | g_string_printf(rs, "%s %s [%s]", cpu_model, cpu_name, |
| 1653 | cpu->halted ? "halted " : "running"); |
| 1654 | } else { |
| 1655 | g_string_printf(rs, "CPU#%d [%s]", cpu->cpu_index, |
| 1656 | cpu->halted ? "halted " : "running"); |
| 1657 | } |
| 1658 | trace_gdbstub_op_extra_info(rs->str); |
| 1659 | gdb_memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len); |
| 1660 | gdb_put_strbuf(); |
| 1661 | } |
| 1662 | |
| 1663 | |
| 1664 | static char **extra_query_flags; |
| 1665 | |
| 1666 | void gdb_extend_qsupported_features(char *qflags) |
| 1667 | { |
| 1668 | if (!extra_query_flags) { |
| 1669 | extra_query_flags = g_new0(char *, 2); |
| 1670 | extra_query_flags[0] = g_strdup(qflags); |
| 1671 | } else if (!g_strv_contains((const gchar * const *) extra_query_flags, |
| 1672 | qflags)) { |
| 1673 | int len = g_strv_length(extra_query_flags); |
| 1674 | extra_query_flags = g_realloc_n(extra_query_flags, len + 2, |
| 1675 | sizeof(char *)); |
| 1676 | extra_query_flags[len] = g_strdup(qflags); |
| 1677 | } |
| 1678 | } |
| 1679 | |
| 1680 | static void handle_query_supported(GArray *params, void *user_ctx) |
| 1681 | { |
| 1682 | g_string_printf(gdbserver_state.str_buf, "PacketSize=%x", MAX_PACKET_LENGTH); |
| 1683 | if (gdb_get_core_xml_file(first_cpu)) { |
| 1684 | g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+"); |
| 1685 | } |
| 1686 | |
| 1687 | if (gdbserver_state.accel_config.can_reverse) { |
| 1688 | g_string_append(gdbserver_state.str_buf, |
| 1689 | ";ReverseStep+;ReverseContinue+"); |
| 1690 | } |
| 1691 | |
| 1692 | #if defined(CONFIG_USER_ONLY) |
| 1693 | #if defined(CONFIG_LINUX) |
| 1694 | if (get_task_state(gdbserver_state.c_cpu)) { |
| 1695 | g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+"); |
| 1696 | } |
| 1697 | g_string_append(gdbserver_state.str_buf, ";QCatchSyscalls+"); |
| 1698 | |
| 1699 | g_string_append(gdbserver_state.str_buf, ";qXfer:siginfo:read+"); |
| 1700 | #endif |
| 1701 | g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+"); |
| 1702 | #endif |
| 1703 | |
| 1704 | if (params->len) { |
| 1705 | const char *gdb_supported = gdb_get_cmd_param(params, 0)->data; |
| 1706 | |
| 1707 | if (strstr(gdb_supported, "multiprocess+")) { |
| 1708 | gdbserver_state.multiprocess = true; |
| 1709 | } |
| 1710 | #if defined(CONFIG_USER_ONLY) |
| 1711 | gdb_handle_query_supported_user(gdb_supported); |
| 1712 | #endif |
| 1713 | } |
| 1714 | |
| 1715 | g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+"); |
| 1716 | |
| 1717 | if (extra_query_flags) { |
| 1718 | int extras = g_strv_length(extra_query_flags); |
| 1719 | for (int i = 0; i < extras; i++) { |
| 1720 | g_string_append(gdbserver_state.str_buf, extra_query_flags[i]); |
| 1721 | } |
| 1722 | } |
| 1723 | |
| 1724 | gdb_put_strbuf(); |
| 1725 | } |
| 1726 | |
| 1727 | static void handle_query_xfer_features(GArray *params, void *user_ctx) |
| 1728 | { |
| 1729 | GDBProcess *process; |
| 1730 | unsigned long len, total_len, addr; |
| 1731 | const char *xml; |
| 1732 | const char *p; |
| 1733 | |
| 1734 | if (params->len < 3) { |
| 1735 | gdb_put_packet("E22"); |
| 1736 | return; |
| 1737 | } |
| 1738 | |
| 1739 | process = gdb_get_cpu_process(gdbserver_state.g_cpu); |
| 1740 | if (!gdb_get_core_xml_file(gdbserver_state.g_cpu)) { |
| 1741 | gdb_put_packet(""); |
| 1742 | return; |
| 1743 | } |
| 1744 | |
| 1745 | p = gdb_get_cmd_param(params, 0)->data; |
| 1746 | xml = get_feature_xml(p, &p, process); |
| 1747 | if (!xml) { |
| 1748 | gdb_put_packet("E00"); |
| 1749 | return; |
| 1750 | } |
| 1751 | |
| 1752 | addr = gdb_get_cmd_param(params, 1)->val_ul; |
| 1753 | len = gdb_get_cmd_param(params, 2)->val_ul; |
| 1754 | total_len = strlen(xml); |
| 1755 | if (addr > total_len) { |
| 1756 | gdb_put_packet("E00"); |
| 1757 | return; |
| 1758 | } |
| 1759 | |
| 1760 | if (len > (MAX_PACKET_LENGTH - 5) / 2) { |
| 1761 | len = (MAX_PACKET_LENGTH - 5) / 2; |
| 1762 | } |
| 1763 | |
| 1764 | if (len < total_len - addr) { |
| 1765 | g_string_assign(gdbserver_state.str_buf, "m"); |
| 1766 | gdb_memtox(gdbserver_state.str_buf, xml + addr, len); |
| 1767 | } else { |
| 1768 | g_string_assign(gdbserver_state.str_buf, "l"); |
| 1769 | gdb_memtox(gdbserver_state.str_buf, xml + addr, total_len - addr); |
| 1770 | } |
| 1771 | |
| 1772 | gdb_put_packet_binary(gdbserver_state.str_buf->str, |
| 1773 | gdbserver_state.str_buf->len, true); |
| 1774 | } |
| 1775 | |
| 1776 | static void handle_query_qemu_supported(GArray *params, void *user_ctx) |
| 1777 | { |
| 1778 | g_string_printf(gdbserver_state.str_buf, "sstepbits;sstep"); |
| 1779 | #ifndef CONFIG_USER_ONLY |
| 1780 | g_string_append(gdbserver_state.str_buf, ";PhyMemMode"); |
| 1781 | #endif |
| 1782 | gdb_put_strbuf(); |
| 1783 | } |
| 1784 | |
| 1785 | static const GdbCmdParseEntry gdb_gen_query_set_common_table[] = { |
| 1786 | /* Order is important if has same prefix */ |
| 1787 | { |
| 1788 | .handler = handle_query_qemu_sstepbits, |
| 1789 | .cmd = "qemu.sstepbits", |
| 1790 | }, |
| 1791 | { |
| 1792 | .handler = handle_query_qemu_sstep, |
| 1793 | .cmd = "qemu.sstep", |
| 1794 | }, |
| 1795 | { |
| 1796 | .handler = handle_set_qemu_sstep, |
| 1797 | .cmd = "qemu.sstep=", |
| 1798 | .cmd_startswith = true, |
| 1799 | .schema = "l0" |
| 1800 | }, |
| 1801 | }; |
| 1802 | |
| 1803 | /** |
| 1804 | * extend_table() - extend one of the command tables |
| 1805 | * @table: the command table to extend (or NULL) |
| 1806 | * @extensions: a list of GdbCmdParseEntry pointers |
| 1807 | * |
| 1808 | * The entries themselves should be pointers to static const |
| 1809 | * GdbCmdParseEntry entries. If the entry is already in the table we |
| 1810 | * skip adding it again. |
| 1811 | * |
| 1812 | * Returns (a potentially freshly allocated) GPtrArray of GdbCmdParseEntry |
| 1813 | */ |
| 1814 | static GPtrArray *extend_table(GPtrArray *table, GPtrArray *extensions) |
| 1815 | { |
| 1816 | if (!table) { |
| 1817 | table = g_ptr_array_new(); |
| 1818 | } |
| 1819 | |
| 1820 | for (int i = 0; i < extensions->len; i++) { |
| 1821 | gpointer entry = g_ptr_array_index(extensions, i); |
| 1822 | if (!g_ptr_array_find(table, entry, NULL)) { |
| 1823 | g_ptr_array_add(table, entry); |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | return table; |
| 1828 | } |
| 1829 | |
| 1830 | /** |
| 1831 | * process_extended_table() - run through an extended command table |
| 1832 | * @table: the command table to check |
| 1833 | * @data: parameters |
| 1834 | * |
| 1835 | * returns true if the command was found and executed |
| 1836 | */ |
| 1837 | static bool process_extended_table(GPtrArray *table, const char *data) |
| 1838 | { |
| 1839 | for (int i = 0; i < table->len; i++) { |
| 1840 | const GdbCmdParseEntry *entry = g_ptr_array_index(table, i); |
| 1841 | if (process_string_cmd(data, entry, 1)) { |
| 1842 | return true; |
| 1843 | } |
| 1844 | } |
| 1845 | return false; |
| 1846 | } |
| 1847 | |
| 1848 | |
| 1849 | /* Ptr to GdbCmdParseEntry */ |
| 1850 | static GPtrArray *extended_query_table; |
| 1851 | |
| 1852 | void gdb_extend_query_table(GPtrArray *new_queries) |
| 1853 | { |
| 1854 | extended_query_table = extend_table(extended_query_table, new_queries); |
| 1855 | } |
| 1856 | |
| 1857 | static const GdbCmdParseEntry gdb_gen_query_table[] = { |
| 1858 | { |
| 1859 | .handler = handle_query_curr_tid, |
| 1860 | .cmd = "C", |
| 1861 | }, |
| 1862 | { |
| 1863 | .handler = handle_query_threads, |
| 1864 | .cmd = "sThreadInfo", |
| 1865 | }, |
| 1866 | { |
| 1867 | .handler = handle_query_gdb_server_version, |
| 1868 | .cmd = "GDBServerVersion", |
| 1869 | }, |
| 1870 | { |
| 1871 | .handler = handle_query_first_threads, |
| 1872 | .cmd = "fThreadInfo", |
| 1873 | }, |
| 1874 | { |
| 1875 | .handler = handle_query_thread_extra, |
| 1876 | .cmd = "ThreadExtraInfo,", |
| 1877 | .cmd_startswith = true, |
| 1878 | .schema = "t0" |
| 1879 | }, |
| 1880 | #ifdef CONFIG_USER_ONLY |
| 1881 | { |
| 1882 | .handler = gdb_handle_query_offsets, |
| 1883 | .cmd = "Offsets", |
| 1884 | }, |
| 1885 | #else |
| 1886 | { |
| 1887 | .handler = gdb_handle_query_rcmd, |
| 1888 | .cmd = "Rcmd,", |
| 1889 | .cmd_startswith = true, |
| 1890 | .schema = "s0" |
| 1891 | }, |
| 1892 | #endif |
| 1893 | { |
| 1894 | .handler = handle_query_supported, |
| 1895 | .cmd = "Supported:", |
| 1896 | .cmd_startswith = true, |
| 1897 | .schema = "s0" |
| 1898 | }, |
| 1899 | { |
| 1900 | .handler = handle_query_supported, |
| 1901 | .cmd = "Supported", |
| 1902 | .schema = "s0" |
| 1903 | }, |
| 1904 | { |
| 1905 | .handler = handle_query_xfer_features, |
| 1906 | .cmd = "Xfer:features:read:", |
| 1907 | .cmd_startswith = true, |
| 1908 | .schema = "s:l,l0" |
| 1909 | }, |
| 1910 | #if defined(CONFIG_USER_ONLY) |
| 1911 | #if defined(CONFIG_LINUX) |
| 1912 | { |
| 1913 | .handler = gdb_handle_query_xfer_auxv, |
| 1914 | .cmd = "Xfer:auxv:read::", |
| 1915 | .cmd_startswith = true, |
| 1916 | .schema = "l,l0" |
| 1917 | }, |
| 1918 | { |
| 1919 | .handler = gdb_handle_query_xfer_siginfo, |
| 1920 | .cmd = "Xfer:siginfo:read::", |
| 1921 | .cmd_startswith = true, |
| 1922 | .schema = "l,l0" |
| 1923 | }, |
| 1924 | #endif |
| 1925 | { |
| 1926 | .handler = gdb_handle_query_xfer_exec_file, |
| 1927 | .cmd = "Xfer:exec-file:read:", |
| 1928 | .cmd_startswith = true, |
| 1929 | .schema = "l:l,l0" |
| 1930 | }, |
| 1931 | #endif |
| 1932 | { |
| 1933 | .handler = gdb_handle_query_attached, |
| 1934 | .cmd = "Attached:", |
| 1935 | .cmd_startswith = true |
| 1936 | }, |
| 1937 | { |
| 1938 | .handler = gdb_handle_query_attached, |
| 1939 | .cmd = "Attached", |
| 1940 | }, |
| 1941 | { |
| 1942 | .handler = handle_query_qemu_supported, |
| 1943 | .cmd = "qemu.Supported", |
| 1944 | }, |
| 1945 | #ifndef CONFIG_USER_ONLY |
| 1946 | { |
| 1947 | .handler = gdb_handle_query_qemu_phy_mem_mode, |
| 1948 | .cmd = "qemu.PhyMemMode", |
| 1949 | }, |
| 1950 | #endif |
| 1951 | }; |
| 1952 | |
| 1953 | /* Ptr to GdbCmdParseEntry */ |
| 1954 | static GPtrArray *extended_set_table; |
| 1955 | |
| 1956 | void gdb_extend_set_table(GPtrArray *new_set) |
| 1957 | { |
| 1958 | extended_set_table = extend_table(extended_set_table, new_set); |
| 1959 | } |
| 1960 | |
| 1961 | static const GdbCmdParseEntry gdb_gen_set_table[] = { |
| 1962 | /* Order is important if has same prefix */ |
| 1963 | { |
| 1964 | .handler = handle_set_qemu_sstep, |
| 1965 | .cmd = "qemu.sstep:", |
| 1966 | .cmd_startswith = true, |
| 1967 | .schema = "l0" |
| 1968 | }, |
| 1969 | #ifndef CONFIG_USER_ONLY |
| 1970 | { |
| 1971 | .handler = gdb_handle_set_qemu_phy_mem_mode, |
| 1972 | .cmd = "qemu.PhyMemMode:", |
| 1973 | .cmd_startswith = true, |
| 1974 | .schema = "l0" |
| 1975 | }, |
| 1976 | #endif |
| 1977 | #if defined(CONFIG_USER_ONLY) |
| 1978 | { |
| 1979 | .handler = gdb_handle_set_catch_syscalls, |
| 1980 | .cmd = "CatchSyscalls:", |
| 1981 | .cmd_startswith = true, |
| 1982 | .schema = "s0", |
| 1983 | }, |
| 1984 | #endif |
| 1985 | }; |
| 1986 | |
| 1987 | static void handle_gen_query(GArray *params, void *user_ctx) |
| 1988 | { |
| 1989 | const char *data; |
| 1990 | |
| 1991 | if (!params->len) { |
| 1992 | return; |
| 1993 | } |
| 1994 | |
| 1995 | data = gdb_get_cmd_param(params, 0)->data; |
| 1996 | |
| 1997 | if (process_string_cmd(data, |
| 1998 | gdb_gen_query_set_common_table, |
| 1999 | ARRAY_SIZE(gdb_gen_query_set_common_table))) { |
| 2000 | return; |
| 2001 | } |
| 2002 | |
| 2003 | if (process_string_cmd(data, |
| 2004 | gdb_gen_query_table, |
| 2005 | ARRAY_SIZE(gdb_gen_query_table))) { |
| 2006 | return; |
| 2007 | } |
| 2008 | |
| 2009 | if (extended_query_table && |
| 2010 | process_extended_table(extended_query_table, data)) { |
| 2011 | return; |
| 2012 | } |
| 2013 | |
| 2014 | /* Can't handle query, return Empty response. */ |
| 2015 | gdb_put_packet(""); |
| 2016 | } |
| 2017 | |
| 2018 | static void handle_gen_set(GArray *params, void *user_ctx) |
| 2019 | { |
| 2020 | const char *data; |
| 2021 | |
| 2022 | if (!params->len) { |
| 2023 | return; |
| 2024 | } |
| 2025 | |
| 2026 | data = gdb_get_cmd_param(params, 0)->data; |
| 2027 | |
| 2028 | if (process_string_cmd(data, |
| 2029 | gdb_gen_query_set_common_table, |
| 2030 | ARRAY_SIZE(gdb_gen_query_set_common_table))) { |
| 2031 | return; |
| 2032 | } |
| 2033 | |
| 2034 | if (process_string_cmd(data, |
| 2035 | gdb_gen_set_table, |
| 2036 | ARRAY_SIZE(gdb_gen_set_table))) { |
| 2037 | return; |
| 2038 | } |
| 2039 | |
| 2040 | if (extended_set_table && |
| 2041 | process_extended_table(extended_set_table, data)) { |
| 2042 | return; |
| 2043 | } |
| 2044 | |
| 2045 | /* Can't handle set, return Empty response. */ |
| 2046 | gdb_put_packet(""); |
| 2047 | } |
| 2048 | |
| 2049 | static void handle_target_halt(GArray *params, void *user_ctx) |
| 2050 | { |
| 2051 | if (gdbserver_state.allow_stop_reply) { |
| 2052 | gdb_build_stop_packet(gdbserver_state.str_buf, gdbserver_state.c_cpu); |
| 2053 | gdbserver_state.allow_stop_reply = false; |
| 2054 | gdb_put_strbuf(); |
| 2055 | } |
| 2056 | /* |
| 2057 | * Remove all the breakpoints when this query is issued, |
| 2058 | * because gdb is doing an initial connect and the state |
| 2059 | * should be cleaned up. |
| 2060 | */ |
| 2061 | gdb_breakpoint_remove_all(gdbserver_state.c_cpu); |
| 2062 | } |
| 2063 | |
| 2064 | static int gdb_handle_packet(const char *line_buf) |
| 2065 | { |
| 2066 | const GdbCmdParseEntry *cmd_parser = NULL; |
| 2067 | |
| 2068 | trace_gdbstub_io_command(line_buf); |
| 2069 | |
| 2070 | switch (line_buf[0]) { |
| 2071 | case '!': |
| 2072 | gdb_put_packet("OK"); |
| 2073 | break; |
| 2074 | case '?': |
| 2075 | { |
| 2076 | static const GdbCmdParseEntry target_halted_cmd_desc = { |
| 2077 | .handler = handle_target_halt, |
| 2078 | .cmd = "?", |
| 2079 | .cmd_startswith = true, |
| 2080 | .allow_stop_reply = true, |
| 2081 | }; |
| 2082 | cmd_parser = &target_halted_cmd_desc; |
| 2083 | } |
| 2084 | break; |
| 2085 | case 'c': |
| 2086 | { |
| 2087 | static const GdbCmdParseEntry continue_cmd_desc = { |
| 2088 | .handler = handle_continue, |
| 2089 | .cmd = "c", |
| 2090 | .cmd_startswith = true, |
| 2091 | .allow_stop_reply = true, |
| 2092 | .schema = "L0" |
| 2093 | }; |
| 2094 | cmd_parser = &continue_cmd_desc; |
| 2095 | } |
| 2096 | break; |
| 2097 | case 'C': |
| 2098 | { |
| 2099 | static const GdbCmdParseEntry cont_with_sig_cmd_desc = { |
| 2100 | .handler = handle_cont_with_sig, |
| 2101 | .cmd = "C", |
| 2102 | .cmd_startswith = true, |
| 2103 | .allow_stop_reply = true, |
| 2104 | .schema = "l0" |
| 2105 | }; |
| 2106 | cmd_parser = &cont_with_sig_cmd_desc; |
| 2107 | } |
| 2108 | break; |
| 2109 | case 'v': |
| 2110 | { |
| 2111 | static const GdbCmdParseEntry v_cmd_desc = { |
| 2112 | .handler = handle_v_commands, |
| 2113 | .cmd = "v", |
| 2114 | .cmd_startswith = true, |
| 2115 | .schema = "s0" |
| 2116 | }; |
| 2117 | cmd_parser = &v_cmd_desc; |
| 2118 | } |
| 2119 | break; |
| 2120 | case 'k': |
| 2121 | /* Kill the target */ |
| 2122 | error_report("QEMU: Terminated via GDBstub"); |
| 2123 | gdb_exit(0); |
| 2124 | gdb_qemu_exit(0); |
| 2125 | break; |
| 2126 | case 'D': |
| 2127 | { |
| 2128 | static const GdbCmdParseEntry detach_cmd_desc = { |
| 2129 | .handler = handle_detach, |
| 2130 | .cmd = "D", |
| 2131 | .cmd_startswith = true, |
| 2132 | .schema = "?.l0" |
| 2133 | }; |
| 2134 | cmd_parser = &detach_cmd_desc; |
| 2135 | } |
| 2136 | break; |
| 2137 | case 's': |
| 2138 | { |
| 2139 | static const GdbCmdParseEntry step_cmd_desc = { |
| 2140 | .handler = handle_step, |
| 2141 | .cmd = "s", |
| 2142 | .cmd_startswith = true, |
| 2143 | .allow_stop_reply = true, |
| 2144 | .schema = "L0" |
| 2145 | }; |
| 2146 | cmd_parser = &step_cmd_desc; |
| 2147 | } |
| 2148 | break; |
| 2149 | case 'b': |
| 2150 | { |
| 2151 | static const GdbCmdParseEntry backward_cmd_desc = { |
| 2152 | .handler = handle_backward, |
| 2153 | .cmd = "b", |
| 2154 | .cmd_startswith = true, |
| 2155 | .allow_stop_reply = true, |
| 2156 | .schema = "o0" |
| 2157 | }; |
| 2158 | cmd_parser = &backward_cmd_desc; |
| 2159 | } |
| 2160 | break; |
| 2161 | case 'F': |
| 2162 | { |
| 2163 | static const GdbCmdParseEntry file_io_cmd_desc = { |
| 2164 | .handler = gdb_handle_file_io, |
| 2165 | .cmd = "F", |
| 2166 | .cmd_startswith = true, |
| 2167 | .schema = "L,L,o0" |
| 2168 | }; |
| 2169 | cmd_parser = &file_io_cmd_desc; |
| 2170 | } |
| 2171 | break; |
| 2172 | case 'g': |
| 2173 | { |
| 2174 | static const GdbCmdParseEntry read_all_regs_cmd_desc = { |
| 2175 | .handler = handle_read_all_regs, |
| 2176 | .cmd = "g", |
| 2177 | .cmd_startswith = true |
| 2178 | }; |
| 2179 | cmd_parser = &read_all_regs_cmd_desc; |
| 2180 | } |
| 2181 | break; |
| 2182 | case 'G': |
| 2183 | { |
| 2184 | static const GdbCmdParseEntry write_all_regs_cmd_desc = { |
| 2185 | .handler = handle_write_all_regs, |
| 2186 | .cmd = "G", |
| 2187 | .cmd_startswith = true, |
| 2188 | .schema = "s0" |
| 2189 | }; |
| 2190 | cmd_parser = &write_all_regs_cmd_desc; |
| 2191 | } |
| 2192 | break; |
| 2193 | case 'm': |
| 2194 | { |
| 2195 | static const GdbCmdParseEntry read_mem_cmd_desc = { |
| 2196 | .handler = handle_read_mem, |
| 2197 | .cmd = "m", |
| 2198 | .cmd_startswith = true, |
| 2199 | .schema = "L,L0" |
| 2200 | }; |
| 2201 | cmd_parser = &read_mem_cmd_desc; |
| 2202 | } |
| 2203 | break; |
| 2204 | case 'M': |
| 2205 | { |
| 2206 | static const GdbCmdParseEntry write_mem_cmd_desc = { |
| 2207 | .handler = handle_write_mem, |
| 2208 | .cmd = "M", |
| 2209 | .cmd_startswith = true, |
| 2210 | .schema = "L,L:s0" |
| 2211 | }; |
| 2212 | cmd_parser = &write_mem_cmd_desc; |
| 2213 | } |
| 2214 | break; |
| 2215 | case 'p': |
| 2216 | { |
| 2217 | static const GdbCmdParseEntry get_reg_cmd_desc = { |
| 2218 | .handler = handle_get_reg, |
| 2219 | .cmd = "p", |
| 2220 | .cmd_startswith = true, |
| 2221 | .schema = "L0" |
| 2222 | }; |
| 2223 | cmd_parser = &get_reg_cmd_desc; |
| 2224 | } |
| 2225 | break; |
| 2226 | case 'P': |
| 2227 | { |
| 2228 | static const GdbCmdParseEntry set_reg_cmd_desc = { |
| 2229 | .handler = handle_set_reg, |
| 2230 | .cmd = "P", |
| 2231 | .cmd_startswith = true, |
| 2232 | .schema = "L?s0" |
| 2233 | }; |
| 2234 | cmd_parser = &set_reg_cmd_desc; |
| 2235 | } |
| 2236 | break; |
| 2237 | case 'Z': |
| 2238 | { |
| 2239 | static const GdbCmdParseEntry insert_bp_cmd_desc = { |
| 2240 | .handler = handle_insert_bp, |
| 2241 | .cmd = "Z", |
| 2242 | .cmd_startswith = true, |
| 2243 | .schema = "l?L?L0" |
| 2244 | }; |
| 2245 | cmd_parser = &insert_bp_cmd_desc; |
| 2246 | } |
| 2247 | break; |
| 2248 | case 'z': |
| 2249 | { |
| 2250 | static const GdbCmdParseEntry remove_bp_cmd_desc = { |
| 2251 | .handler = handle_remove_bp, |
| 2252 | .cmd = "z", |
| 2253 | .cmd_startswith = true, |
| 2254 | .schema = "l?L?L0" |
| 2255 | }; |
| 2256 | cmd_parser = &remove_bp_cmd_desc; |
| 2257 | } |
| 2258 | break; |
| 2259 | case 'H': |
| 2260 | { |
| 2261 | static const GdbCmdParseEntry set_thread_cmd_desc = { |
| 2262 | .handler = handle_set_thread, |
| 2263 | .cmd = "H", |
| 2264 | .cmd_startswith = true, |
| 2265 | .schema = "o.t0" |
| 2266 | }; |
| 2267 | cmd_parser = &set_thread_cmd_desc; |
| 2268 | } |
| 2269 | break; |
| 2270 | case 'T': |
| 2271 | { |
| 2272 | static const GdbCmdParseEntry thread_alive_cmd_desc = { |
| 2273 | .handler = handle_thread_alive, |
| 2274 | .cmd = "T", |
| 2275 | .cmd_startswith = true, |
| 2276 | .schema = "t0" |
| 2277 | }; |
| 2278 | cmd_parser = &thread_alive_cmd_desc; |
| 2279 | } |
| 2280 | break; |
| 2281 | case 'q': |
| 2282 | { |
| 2283 | static const GdbCmdParseEntry gen_query_cmd_desc = { |
| 2284 | .handler = handle_gen_query, |
| 2285 | .cmd = "q", |
| 2286 | .cmd_startswith = true, |
| 2287 | .schema = "s0" |
| 2288 | }; |
| 2289 | cmd_parser = &gen_query_cmd_desc; |
| 2290 | } |
| 2291 | break; |
| 2292 | case 'Q': |
| 2293 | { |
| 2294 | static const GdbCmdParseEntry gen_set_cmd_desc = { |
| 2295 | .handler = handle_gen_set, |
| 2296 | .cmd = "Q", |
| 2297 | .cmd_startswith = true, |
| 2298 | .schema = "s0" |
| 2299 | }; |
| 2300 | cmd_parser = &gen_set_cmd_desc; |
| 2301 | } |
| 2302 | break; |
| 2303 | default: |
| 2304 | /* put empty packet */ |
| 2305 | gdb_put_packet(""); |
| 2306 | break; |
| 2307 | } |
| 2308 | |
| 2309 | if (cmd_parser) { |
| 2310 | run_cmd_parser(line_buf, cmd_parser); |
| 2311 | } |
| 2312 | |
| 2313 | return RS_IDLE; |
| 2314 | } |
| 2315 | |
| 2316 | void gdb_set_stop_cpu(CPUState *cpu) |
| 2317 | { |
| 2318 | GDBProcess *p = gdb_get_cpu_process(cpu); |
| 2319 | |
| 2320 | if (!p->attached) { |
| 2321 | /* |
| 2322 | * Having a stop CPU corresponding to a process that is not attached |
| 2323 | * confuses GDB. So we ignore the request. |
| 2324 | */ |
| 2325 | return; |
| 2326 | } |
| 2327 | |
| 2328 | gdbserver_state.c_cpu = cpu; |
| 2329 | gdbserver_state.g_cpu = cpu; |
| 2330 | } |
| 2331 | |
| 2332 | void gdb_read_byte(uint8_t ch) |
| 2333 | { |
| 2334 | uint8_t reply; |
| 2335 | |
| 2336 | gdbserver_state.allow_stop_reply = false; |
| 2337 | #ifndef CONFIG_USER_ONLY |
| 2338 | if (gdbserver_state.last_packet->len) { |
| 2339 | /* Waiting for a response to the last packet. If we see the start |
| 2340 | of a new command then abandon the previous response. */ |
| 2341 | if (ch == '-') { |
| 2342 | trace_gdbstub_err_got_nack(); |
| 2343 | gdb_put_buffer(gdbserver_state.last_packet->data, |
| 2344 | gdbserver_state.last_packet->len); |
| 2345 | } else if (ch == '+') { |
| 2346 | trace_gdbstub_io_got_ack(); |
| 2347 | } else { |
| 2348 | trace_gdbstub_io_got_unexpected(ch); |
| 2349 | } |
| 2350 | |
| 2351 | if (ch == '+' || ch == '$') { |
| 2352 | g_byte_array_set_size(gdbserver_state.last_packet, 0); |
| 2353 | } |
| 2354 | if (ch != '$') |
| 2355 | return; |
| 2356 | } |
| 2357 | if (runstate_is_running()) { |
| 2358 | /* |
| 2359 | * When the CPU is running, we cannot do anything except stop |
| 2360 | * it when receiving a char. This is expected on a Ctrl-C in the |
| 2361 | * gdb client. Because we are in all-stop mode, gdb sends a |
| 2362 | * 0x03 byte which is not a usual packet, so we handle it specially |
| 2363 | * here, but it does expect a stop reply. |
| 2364 | */ |
| 2365 | if (ch != 0x03) { |
| 2366 | trace_gdbstub_err_unexpected_runpkt(ch); |
| 2367 | } else { |
| 2368 | gdbserver_state.allow_stop_reply = true; |
| 2369 | } |
| 2370 | vm_stop(RUN_STATE_PAUSED); |
| 2371 | } else |
| 2372 | #endif |
| 2373 | { |
| 2374 | switch(gdbserver_state.state) { |
| 2375 | case RS_IDLE: |
| 2376 | if (ch == '$') { |
| 2377 | /* start of command packet */ |
| 2378 | gdbserver_state.line_buf_index = 0; |
| 2379 | gdbserver_state.line_sum = 0; |
| 2380 | gdbserver_state.state = RS_GETLINE; |
| 2381 | } else if (ch == '+') { |
| 2382 | /* |
| 2383 | * do nothing, gdb may preemptively send out ACKs on |
| 2384 | * initial connection |
| 2385 | */ |
| 2386 | } else { |
| 2387 | trace_gdbstub_err_garbage(ch); |
| 2388 | } |
| 2389 | break; |
| 2390 | case RS_GETLINE: |
| 2391 | if (ch == '}') { |
| 2392 | /* start escape sequence */ |
| 2393 | gdbserver_state.state = RS_GETLINE_ESC; |
| 2394 | gdbserver_state.line_sum += ch; |
| 2395 | } else if (ch == '*') { |
| 2396 | /* start run length encoding sequence */ |
| 2397 | gdbserver_state.state = RS_GETLINE_RLE; |
| 2398 | gdbserver_state.line_sum += ch; |
| 2399 | } else if (ch == '#') { |
| 2400 | /* end of command, start of checksum*/ |
| 2401 | gdbserver_state.state = RS_CHKSUM1; |
| 2402 | } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { |
| 2403 | trace_gdbstub_err_overrun(); |
| 2404 | gdbserver_state.state = RS_IDLE; |
| 2405 | } else { |
| 2406 | /* unescaped command character */ |
| 2407 | gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch; |
| 2408 | gdbserver_state.line_sum += ch; |
| 2409 | } |
| 2410 | break; |
| 2411 | case RS_GETLINE_ESC: |
| 2412 | if (ch == '#') { |
| 2413 | /* unexpected end of command in escape sequence */ |
| 2414 | gdbserver_state.state = RS_CHKSUM1; |
| 2415 | } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { |
| 2416 | /* command buffer overrun */ |
| 2417 | trace_gdbstub_err_overrun(); |
| 2418 | gdbserver_state.state = RS_IDLE; |
| 2419 | } else { |
| 2420 | /* parse escaped character and leave escape state */ |
| 2421 | gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch ^ 0x20; |
| 2422 | gdbserver_state.line_sum += ch; |
| 2423 | gdbserver_state.state = RS_GETLINE; |
| 2424 | } |
| 2425 | break; |
| 2426 | case RS_GETLINE_RLE: |
| 2427 | /* |
| 2428 | * Run-length encoding is explained in "Debugging with GDB / |
| 2429 | * Appendix E GDB Remote Serial Protocol / Overview". |
| 2430 | */ |
| 2431 | if (ch < ' ' || ch == '#' || ch == '$' || ch > 126) { |
| 2432 | /* invalid RLE count encoding */ |
| 2433 | trace_gdbstub_err_invalid_repeat(ch); |
| 2434 | gdbserver_state.state = RS_GETLINE; |
| 2435 | } else { |
| 2436 | /* decode repeat length */ |
| 2437 | int repeat = ch - ' ' + 3; |
| 2438 | if (gdbserver_state.line_buf_index + repeat >= sizeof(gdbserver_state.line_buf) - 1) { |
| 2439 | /* that many repeats would overrun the command buffer */ |
| 2440 | trace_gdbstub_err_overrun(); |
| 2441 | gdbserver_state.state = RS_IDLE; |
| 2442 | } else if (gdbserver_state.line_buf_index < 1) { |
| 2443 | /* got a repeat but we have nothing to repeat */ |
| 2444 | trace_gdbstub_err_invalid_rle(); |
| 2445 | gdbserver_state.state = RS_GETLINE; |
| 2446 | } else { |
| 2447 | /* repeat the last character */ |
| 2448 | memset(gdbserver_state.line_buf + gdbserver_state.line_buf_index, |
| 2449 | gdbserver_state.line_buf[gdbserver_state.line_buf_index - 1], repeat); |
| 2450 | gdbserver_state.line_buf_index += repeat; |
| 2451 | gdbserver_state.line_sum += ch; |
| 2452 | gdbserver_state.state = RS_GETLINE; |
| 2453 | } |
| 2454 | } |
| 2455 | break; |
| 2456 | case RS_CHKSUM1: |
| 2457 | /* get high hex digit of checksum */ |
| 2458 | if (!isxdigit(ch)) { |
| 2459 | trace_gdbstub_err_checksum_invalid(ch); |
| 2460 | gdbserver_state.state = RS_GETLINE; |
| 2461 | break; |
| 2462 | } |
| 2463 | gdbserver_state.line_buf[gdbserver_state.line_buf_index] = '\0'; |
| 2464 | gdbserver_state.line_csum = fromhex(ch) << 4; |
| 2465 | gdbserver_state.state = RS_CHKSUM2; |
| 2466 | break; |
| 2467 | case RS_CHKSUM2: |
| 2468 | /* get low hex digit of checksum */ |
| 2469 | if (!isxdigit(ch)) { |
| 2470 | trace_gdbstub_err_checksum_invalid(ch); |
| 2471 | gdbserver_state.state = RS_GETLINE; |
| 2472 | break; |
| 2473 | } |
| 2474 | gdbserver_state.line_csum |= fromhex(ch); |
| 2475 | |
| 2476 | if (gdbserver_state.line_csum != (gdbserver_state.line_sum & 0xff)) { |
| 2477 | trace_gdbstub_err_checksum_incorrect(gdbserver_state.line_sum, gdbserver_state.line_csum); |
| 2478 | /* send NAK reply */ |
| 2479 | reply = '-'; |
| 2480 | gdb_put_buffer(&reply, 1); |
| 2481 | gdbserver_state.state = RS_IDLE; |
| 2482 | } else { |
| 2483 | /* send ACK reply */ |
| 2484 | reply = '+'; |
| 2485 | gdb_put_buffer(&reply, 1); |
| 2486 | gdbserver_state.state = gdb_handle_packet(gdbserver_state.line_buf); |
| 2487 | } |
| 2488 | break; |
| 2489 | default: |
| 2490 | abort(); |
| 2491 | } |
| 2492 | } |
| 2493 | } |
| 2494 | |
| 2495 | /* |
| 2496 | * Create the process that will contain all the "orphan" CPUs (that are not |
| 2497 | * part of a CPU cluster). Note that if this process contains no CPUs, it won't |
| 2498 | * be attachable and thus will be invisible to the user. |
| 2499 | */ |
| 2500 | void gdb_create_default_process(GDBState *s) |
| 2501 | { |
| 2502 | GDBProcess *process; |
| 2503 | int pid; |
| 2504 | |
| 2505 | #ifdef CONFIG_USER_ONLY |
| 2506 | assert(gdbserver_state.process_num == 0); |
| 2507 | pid = getpid(); |
| 2508 | #else |
| 2509 | if (gdbserver_state.process_num) { |
| 2510 | pid = s->processes[s->process_num - 1].pid; |
| 2511 | } else { |
| 2512 | pid = 0; |
| 2513 | } |
| 2514 | /* We need an available PID slot for this process */ |
| 2515 | assert(pid < UINT32_MAX); |
| 2516 | pid++; |
| 2517 | #endif |
| 2518 | |
| 2519 | s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); |
| 2520 | process = &s->processes[s->process_num - 1]; |
| 2521 | process->pid = pid; |
| 2522 | process->attached = false; |
| 2523 | process->target_xml = NULL; |
| 2524 | } |
| 2525 |