| 1 | /* Remote utility routines for the remote server for GDB. |
| 2 | Copyright (C) 1986-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "server.h" |
| 20 | #if HAVE_TERMIOS_H |
| 21 | #include <termios.h> |
| 22 | #endif |
| 23 | #include "target.h" |
| 24 | #include "gdbthread.h" |
| 25 | #include "tdesc.h" |
| 26 | #include "debug.h" |
| 27 | #include "dll.h" |
| 28 | #include "gdbsupport/rsp-low.h" |
| 29 | #include "gdbsupport/netstuff.h" |
| 30 | #include "gdbsupport/filestuff.h" |
| 31 | #include "gdbsupport/gdb-sigmask.h" |
| 32 | #include <ctype.h> |
| 33 | #if HAVE_SYS_IOCTL_H |
| 34 | #include <sys/ioctl.h> |
| 35 | #endif |
| 36 | #if HAVE_SYS_FILE_H |
| 37 | #include <sys/file.h> |
| 38 | #endif |
| 39 | #if HAVE_NETINET_IN_H |
| 40 | #include <netinet/in.h> |
| 41 | #endif |
| 42 | #if HAVE_SYS_SOCKET_H |
| 43 | #include <sys/socket.h> |
| 44 | #endif |
| 45 | #if HAVE_NETDB_H |
| 46 | #include <netdb.h> |
| 47 | #endif |
| 48 | #if HAVE_NETINET_TCP_H |
| 49 | #include <netinet/tcp.h> |
| 50 | #endif |
| 51 | #if HAVE_SYS_IOCTL_H |
| 52 | #include <sys/ioctl.h> |
| 53 | #endif |
| 54 | #if HAVE_SIGNAL_H |
| 55 | #include <signal.h> |
| 56 | #endif |
| 57 | #if HAVE_FCNTL_H |
| 58 | #include <fcntl.h> |
| 59 | #endif |
| 60 | #include "gdbsupport/gdb_sys_time.h" |
| 61 | #include <unistd.h> |
| 62 | #if HAVE_ARPA_INET_H |
| 63 | #include <arpa/inet.h> |
| 64 | #endif |
| 65 | #include <sys/stat.h> |
| 66 | |
| 67 | #if USE_WIN32API |
| 68 | #include <ws2tcpip.h> |
| 69 | #endif |
| 70 | |
| 71 | #if __QNX__ |
| 72 | #include <sys/iomgr.h> |
| 73 | #endif /* __QNX__ */ |
| 74 | |
| 75 | #ifndef HAVE_SOCKLEN_T |
| 76 | typedef int socklen_t; |
| 77 | #endif |
| 78 | |
| 79 | #ifndef IN_PROCESS_AGENT |
| 80 | |
| 81 | #if USE_WIN32API |
| 82 | # define INVALID_DESCRIPTOR INVALID_SOCKET |
| 83 | #else |
| 84 | # define INVALID_DESCRIPTOR -1 |
| 85 | #endif |
| 86 | |
| 87 | /* Extra value for readchar_callback. */ |
| 88 | enum { |
| 89 | /* The callback is currently not scheduled. */ |
| 90 | NOT_SCHEDULED = -1 |
| 91 | }; |
| 92 | |
| 93 | /* Status of the readchar callback. |
| 94 | Either NOT_SCHEDULED or the callback id. */ |
| 95 | static int readchar_callback = NOT_SCHEDULED; |
| 96 | |
| 97 | static int readchar (void); |
| 98 | static void reset_readchar (void); |
| 99 | static void reschedule (void); |
| 100 | |
| 101 | /* A cache entry for a successfully looked-up symbol. */ |
| 102 | struct sym_cache |
| 103 | { |
| 104 | char *name; |
| 105 | CORE_ADDR addr; |
| 106 | struct sym_cache *next; |
| 107 | }; |
| 108 | |
| 109 | static int remote_is_stdio = 0; |
| 110 | |
| 111 | static gdb_fildes_t remote_desc = INVALID_DESCRIPTOR; |
| 112 | static gdb_fildes_t listen_desc = INVALID_DESCRIPTOR; |
| 113 | |
| 114 | #ifdef USE_WIN32API |
| 115 | # define read(fd, buf, len) recv (fd, (char *) buf, len, 0) |
| 116 | # define write(fd, buf, len) send (fd, (char *) buf, len, 0) |
| 117 | #endif |
| 118 | |
| 119 | int |
| 120 | gdb_connected (void) |
| 121 | { |
| 122 | return remote_desc != INVALID_DESCRIPTOR; |
| 123 | } |
| 124 | |
| 125 | /* Return true if the remote connection is over stdio. */ |
| 126 | |
| 127 | int |
| 128 | remote_connection_is_stdio (void) |
| 129 | { |
| 130 | return remote_is_stdio; |
| 131 | } |
| 132 | |
| 133 | static void |
| 134 | enable_async_notification (int fd) |
| 135 | { |
| 136 | #if defined(F_SETFL) && defined (FASYNC) |
| 137 | int save_fcntl_flags; |
| 138 | |
| 139 | save_fcntl_flags = fcntl (fd, F_GETFL, 0); |
| 140 | fcntl (fd, F_SETFL, save_fcntl_flags | FASYNC); |
| 141 | #if defined (F_SETOWN) |
| 142 | fcntl (fd, F_SETOWN, getpid ()); |
| 143 | #endif |
| 144 | #endif |
| 145 | } |
| 146 | |
| 147 | static int |
| 148 | handle_accept_event (int err, gdb_client_data client_data) |
| 149 | { |
| 150 | struct sockaddr_storage sockaddr; |
| 151 | socklen_t len = sizeof (sockaddr); |
| 152 | |
| 153 | if (debug_threads) |
| 154 | debug_printf ("handling possible accept event\n"); |
| 155 | |
| 156 | remote_desc = accept (listen_desc, (struct sockaddr *) &sockaddr, &len); |
| 157 | if (remote_desc == -1) |
| 158 | perror_with_name ("Accept failed"); |
| 159 | |
| 160 | /* Enable TCP keep alive process. */ |
| 161 | socklen_t tmp = 1; |
| 162 | setsockopt (remote_desc, SOL_SOCKET, SO_KEEPALIVE, |
| 163 | (char *) &tmp, sizeof (tmp)); |
| 164 | |
| 165 | /* Tell TCP not to delay small packets. This greatly speeds up |
| 166 | interactive response. */ |
| 167 | tmp = 1; |
| 168 | setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY, |
| 169 | (char *) &tmp, sizeof (tmp)); |
| 170 | |
| 171 | #ifndef USE_WIN32API |
| 172 | signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply |
| 173 | exits when the remote side dies. */ |
| 174 | #endif |
| 175 | |
| 176 | if (run_once) |
| 177 | { |
| 178 | #ifndef USE_WIN32API |
| 179 | close (listen_desc); /* No longer need this */ |
| 180 | #else |
| 181 | closesocket (listen_desc); /* No longer need this */ |
| 182 | #endif |
| 183 | } |
| 184 | |
| 185 | /* Even if !RUN_ONCE no longer notice new connections. Still keep the |
| 186 | descriptor open for add_file_handler to wait for a new connection. */ |
| 187 | delete_file_handler (listen_desc); |
| 188 | |
| 189 | /* Convert IP address to string. */ |
| 190 | char orig_host[GDB_NI_MAX_ADDR], orig_port[GDB_NI_MAX_PORT]; |
| 191 | |
| 192 | int r = getnameinfo ((struct sockaddr *) &sockaddr, len, |
| 193 | orig_host, sizeof (orig_host), |
| 194 | orig_port, sizeof (orig_port), |
| 195 | NI_NUMERICHOST | NI_NUMERICSERV); |
| 196 | |
| 197 | if (r != 0) |
| 198 | fprintf (stderr, _("Could not obtain remote address: %s\n"), |
| 199 | gai_strerror (r)); |
| 200 | else |
| 201 | fprintf (stderr, _("Remote debugging from host %s, port %s\n"), |
| 202 | orig_host, orig_port); |
| 203 | |
| 204 | enable_async_notification (remote_desc); |
| 205 | |
| 206 | /* Register the event loop handler. */ |
| 207 | add_file_handler (remote_desc, handle_serial_event, NULL); |
| 208 | |
| 209 | /* We have a new GDB connection now. If we were disconnected |
| 210 | tracing, there's a window where the target could report a stop |
| 211 | event to the event loop, and since we have a connection now, we'd |
| 212 | try to send vStopped notifications to GDB. But, don't do that |
| 213 | until GDB as selected all-stop/non-stop, and has queried the |
| 214 | threads' status ('?'). */ |
| 215 | target_async (0); |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | /* Prepare for a later connection to a remote debugger. |
| 221 | NAME is the filename used for communication. */ |
| 222 | |
| 223 | void |
| 224 | remote_prepare (const char *name) |
| 225 | { |
| 226 | client_state &cs = get_client_state (); |
| 227 | #ifdef USE_WIN32API |
| 228 | static int winsock_initialized; |
| 229 | #endif |
| 230 | socklen_t tmp; |
| 231 | |
| 232 | remote_is_stdio = 0; |
| 233 | if (strcmp (name, STDIO_CONNECTION_NAME) == 0) |
| 234 | { |
| 235 | /* We need to record fact that we're using stdio sooner than the |
| 236 | call to remote_open so start_inferior knows the connection is |
| 237 | via stdio. */ |
| 238 | remote_is_stdio = 1; |
| 239 | cs.transport_is_reliable = 1; |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | struct addrinfo hint; |
| 244 | struct addrinfo *ainfo; |
| 245 | |
| 246 | memset (&hint, 0, sizeof (hint)); |
| 247 | /* Assume no prefix will be passed, therefore we should use |
| 248 | AF_UNSPEC. */ |
| 249 | hint.ai_family = AF_UNSPEC; |
| 250 | hint.ai_socktype = SOCK_STREAM; |
| 251 | hint.ai_protocol = IPPROTO_TCP; |
| 252 | |
| 253 | parsed_connection_spec parsed |
| 254 | = parse_connection_spec_without_prefix (name, &hint); |
| 255 | |
| 256 | if (parsed.port_str.empty ()) |
| 257 | { |
| 258 | cs.transport_is_reliable = 0; |
| 259 | return; |
| 260 | } |
| 261 | |
| 262 | #ifdef USE_WIN32API |
| 263 | if (!winsock_initialized) |
| 264 | { |
| 265 | WSADATA wsad; |
| 266 | |
| 267 | WSAStartup (MAKEWORD (1, 0), &wsad); |
| 268 | winsock_initialized = 1; |
| 269 | } |
| 270 | #endif |
| 271 | |
| 272 | int r = getaddrinfo (parsed.host_str.c_str (), parsed.port_str.c_str (), |
| 273 | &hint, &ainfo); |
| 274 | |
| 275 | if (r != 0) |
| 276 | error (_("%s: cannot resolve name: %s"), name, gai_strerror (r)); |
| 277 | |
| 278 | scoped_free_addrinfo freeaddrinfo (ainfo); |
| 279 | |
| 280 | struct addrinfo *iter; |
| 281 | |
| 282 | for (iter = ainfo; iter != NULL; iter = iter->ai_next) |
| 283 | { |
| 284 | listen_desc = gdb_socket_cloexec (iter->ai_family, iter->ai_socktype, |
| 285 | iter->ai_protocol); |
| 286 | |
| 287 | if (listen_desc >= 0) |
| 288 | break; |
| 289 | } |
| 290 | |
| 291 | if (iter == NULL) |
| 292 | perror_with_name ("Can't open socket"); |
| 293 | |
| 294 | /* Allow rapid reuse of this port. */ |
| 295 | tmp = 1; |
| 296 | setsockopt (listen_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, |
| 297 | sizeof (tmp)); |
| 298 | |
| 299 | switch (iter->ai_family) |
| 300 | { |
| 301 | case AF_INET: |
| 302 | ((struct sockaddr_in *) iter->ai_addr)->sin_addr.s_addr = INADDR_ANY; |
| 303 | break; |
| 304 | case AF_INET6: |
| 305 | ((struct sockaddr_in6 *) iter->ai_addr)->sin6_addr = in6addr_any; |
| 306 | break; |
| 307 | default: |
| 308 | internal_error (__FILE__, __LINE__, |
| 309 | _("Invalid 'ai_family' %d\n"), iter->ai_family); |
| 310 | } |
| 311 | |
| 312 | if (bind (listen_desc, iter->ai_addr, iter->ai_addrlen) != 0) |
| 313 | perror_with_name ("Can't bind address"); |
| 314 | |
| 315 | if (listen (listen_desc, 1) != 0) |
| 316 | perror_with_name ("Can't listen on socket"); |
| 317 | |
| 318 | cs.transport_is_reliable = 1; |
| 319 | } |
| 320 | |
| 321 | /* Open a connection to a remote debugger. |
| 322 | NAME is the filename used for communication. */ |
| 323 | |
| 324 | void |
| 325 | remote_open (const char *name) |
| 326 | { |
| 327 | const char *port_str; |
| 328 | |
| 329 | port_str = strchr (name, ':'); |
| 330 | #ifdef USE_WIN32API |
| 331 | if (port_str == NULL) |
| 332 | error ("Only HOST:PORT is supported on this platform."); |
| 333 | #endif |
| 334 | |
| 335 | if (strcmp (name, STDIO_CONNECTION_NAME) == 0) |
| 336 | { |
| 337 | fprintf (stderr, "Remote debugging using stdio\n"); |
| 338 | |
| 339 | /* Use stdin as the handle of the connection. |
| 340 | We only select on reads, for example. */ |
| 341 | remote_desc = fileno (stdin); |
| 342 | |
| 343 | enable_async_notification (remote_desc); |
| 344 | |
| 345 | /* Register the event loop handler. */ |
| 346 | add_file_handler (remote_desc, handle_serial_event, NULL); |
| 347 | } |
| 348 | #ifndef USE_WIN32API |
| 349 | else if (port_str == NULL) |
| 350 | { |
| 351 | struct stat statbuf; |
| 352 | |
| 353 | if (stat (name, &statbuf) == 0 |
| 354 | && (S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode))) |
| 355 | remote_desc = open (name, O_RDWR); |
| 356 | else |
| 357 | { |
| 358 | errno = EINVAL; |
| 359 | remote_desc = -1; |
| 360 | } |
| 361 | |
| 362 | if (remote_desc < 0) |
| 363 | perror_with_name ("Could not open remote device"); |
| 364 | |
| 365 | #if HAVE_TERMIOS_H |
| 366 | { |
| 367 | struct termios termios; |
| 368 | tcgetattr (remote_desc, &termios); |
| 369 | |
| 370 | termios.c_iflag = 0; |
| 371 | termios.c_oflag = 0; |
| 372 | termios.c_lflag = 0; |
| 373 | termios.c_cflag &= ~(CSIZE | PARENB); |
| 374 | termios.c_cflag |= CLOCAL | CS8; |
| 375 | termios.c_cc[VMIN] = 1; |
| 376 | termios.c_cc[VTIME] = 0; |
| 377 | |
| 378 | tcsetattr (remote_desc, TCSANOW, &termios); |
| 379 | } |
| 380 | #endif |
| 381 | |
| 382 | fprintf (stderr, "Remote debugging using %s\n", name); |
| 383 | |
| 384 | enable_async_notification (remote_desc); |
| 385 | |
| 386 | /* Register the event loop handler. */ |
| 387 | add_file_handler (remote_desc, handle_serial_event, NULL); |
| 388 | } |
| 389 | #endif /* USE_WIN32API */ |
| 390 | else |
| 391 | { |
| 392 | char listen_port[GDB_NI_MAX_PORT]; |
| 393 | struct sockaddr_storage sockaddr; |
| 394 | socklen_t len = sizeof (sockaddr); |
| 395 | |
| 396 | if (getsockname (listen_desc, (struct sockaddr *) &sockaddr, &len) < 0) |
| 397 | perror_with_name ("Can't determine port"); |
| 398 | |
| 399 | int r = getnameinfo ((struct sockaddr *) &sockaddr, len, |
| 400 | NULL, 0, |
| 401 | listen_port, sizeof (listen_port), |
| 402 | NI_NUMERICSERV); |
| 403 | |
| 404 | if (r != 0) |
| 405 | fprintf (stderr, _("Can't obtain port where we are listening: %s"), |
| 406 | gai_strerror (r)); |
| 407 | else |
| 408 | fprintf (stderr, _("Listening on port %s\n"), listen_port); |
| 409 | |
| 410 | fflush (stderr); |
| 411 | |
| 412 | /* Register the event loop handler. */ |
| 413 | add_file_handler (listen_desc, handle_accept_event, NULL); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | void |
| 418 | remote_close (void) |
| 419 | { |
| 420 | delete_file_handler (remote_desc); |
| 421 | |
| 422 | disable_async_io (); |
| 423 | |
| 424 | #ifdef USE_WIN32API |
| 425 | closesocket (remote_desc); |
| 426 | #else |
| 427 | if (! remote_connection_is_stdio ()) |
| 428 | close (remote_desc); |
| 429 | #endif |
| 430 | remote_desc = INVALID_DESCRIPTOR; |
| 431 | |
| 432 | reset_readchar (); |
| 433 | } |
| 434 | |
| 435 | #endif |
| 436 | |
| 437 | #ifndef IN_PROCESS_AGENT |
| 438 | |
| 439 | void |
| 440 | decode_address (CORE_ADDR *addrp, const char *start, int len) |
| 441 | { |
| 442 | CORE_ADDR addr; |
| 443 | char ch; |
| 444 | int i; |
| 445 | |
| 446 | addr = 0; |
| 447 | for (i = 0; i < len; i++) |
| 448 | { |
| 449 | ch = start[i]; |
| 450 | addr = addr << 4; |
| 451 | addr = addr | (fromhex (ch) & 0x0f); |
| 452 | } |
| 453 | *addrp = addr; |
| 454 | } |
| 455 | |
| 456 | const char * |
| 457 | decode_address_to_semicolon (CORE_ADDR *addrp, const char *start) |
| 458 | { |
| 459 | const char *end; |
| 460 | |
| 461 | end = start; |
| 462 | while (*end != '\0' && *end != ';') |
| 463 | end++; |
| 464 | |
| 465 | decode_address (addrp, start, end - start); |
| 466 | |
| 467 | if (*end == ';') |
| 468 | end++; |
| 469 | return end; |
| 470 | } |
| 471 | |
| 472 | #endif |
| 473 | |
| 474 | #ifndef IN_PROCESS_AGENT |
| 475 | |
| 476 | /* Look for a sequence of characters which can be run-length encoded. |
| 477 | If there are any, update *CSUM and *P. Otherwise, output the |
| 478 | single character. Return the number of characters consumed. */ |
| 479 | |
| 480 | static int |
| 481 | try_rle (char *buf, int remaining, unsigned char *csum, char **p) |
| 482 | { |
| 483 | int n; |
| 484 | |
| 485 | /* Always output the character. */ |
| 486 | *csum += buf[0]; |
| 487 | *(*p)++ = buf[0]; |
| 488 | |
| 489 | /* Don't go past '~'. */ |
| 490 | if (remaining > 97) |
| 491 | remaining = 97; |
| 492 | |
| 493 | for (n = 1; n < remaining; n++) |
| 494 | if (buf[n] != buf[0]) |
| 495 | break; |
| 496 | |
| 497 | /* N is the index of the first character not the same as buf[0]. |
| 498 | buf[0] is counted twice, so by decrementing N, we get the number |
| 499 | of characters the RLE sequence will replace. */ |
| 500 | n--; |
| 501 | |
| 502 | if (n < 3) |
| 503 | return 1; |
| 504 | |
| 505 | /* Skip the frame characters. The manual says to skip '+' and '-' |
| 506 | also, but there's no reason to. Unfortunately these two unusable |
| 507 | characters double the encoded length of a four byte zero |
| 508 | value. */ |
| 509 | while (n + 29 == '$' || n + 29 == '#') |
| 510 | n--; |
| 511 | |
| 512 | *csum += '*'; |
| 513 | *(*p)++ = '*'; |
| 514 | *csum += n + 29; |
| 515 | *(*p)++ = n + 29; |
| 516 | |
| 517 | return n + 1; |
| 518 | } |
| 519 | |
| 520 | #endif |
| 521 | |
| 522 | #ifndef IN_PROCESS_AGENT |
| 523 | |
| 524 | /* Write a PTID to BUF. Returns BUF+CHARACTERS_WRITTEN. */ |
| 525 | |
| 526 | char * |
| 527 | write_ptid (char *buf, ptid_t ptid) |
| 528 | { |
| 529 | client_state &cs = get_client_state (); |
| 530 | int pid, tid; |
| 531 | |
| 532 | if (cs.multi_process) |
| 533 | { |
| 534 | pid = ptid.pid (); |
| 535 | if (pid < 0) |
| 536 | buf += sprintf (buf, "p-%x.", -pid); |
| 537 | else |
| 538 | buf += sprintf (buf, "p%x.", pid); |
| 539 | } |
| 540 | tid = ptid.lwp (); |
| 541 | if (tid < 0) |
| 542 | buf += sprintf (buf, "-%x", -tid); |
| 543 | else |
| 544 | buf += sprintf (buf, "%x", tid); |
| 545 | |
| 546 | return buf; |
| 547 | } |
| 548 | |
| 549 | static ULONGEST |
| 550 | hex_or_minus_one (const char *buf, const char **obuf) |
| 551 | { |
| 552 | ULONGEST ret; |
| 553 | |
| 554 | if (startswith (buf, "-1")) |
| 555 | { |
| 556 | ret = (ULONGEST) -1; |
| 557 | buf += 2; |
| 558 | } |
| 559 | else |
| 560 | buf = unpack_varlen_hex (buf, &ret); |
| 561 | |
| 562 | if (obuf) |
| 563 | *obuf = buf; |
| 564 | |
| 565 | return ret; |
| 566 | } |
| 567 | |
| 568 | /* Extract a PTID from BUF. If non-null, OBUF is set to the to one |
| 569 | passed the last parsed char. Returns null_ptid on error. */ |
| 570 | ptid_t |
| 571 | read_ptid (const char *buf, const char **obuf) |
| 572 | { |
| 573 | const char *p = buf; |
| 574 | const char *pp; |
| 575 | ULONGEST pid = 0, tid = 0; |
| 576 | |
| 577 | if (*p == 'p') |
| 578 | { |
| 579 | /* Multi-process ptid. */ |
| 580 | pp = unpack_varlen_hex (p + 1, &pid); |
| 581 | if (*pp != '.') |
| 582 | error ("invalid remote ptid: %s\n", p); |
| 583 | |
| 584 | p = pp + 1; |
| 585 | |
| 586 | tid = hex_or_minus_one (p, &pp); |
| 587 | |
| 588 | if (obuf) |
| 589 | *obuf = pp; |
| 590 | return ptid_t (pid, tid, 0); |
| 591 | } |
| 592 | |
| 593 | /* No multi-process. Just a tid. */ |
| 594 | tid = hex_or_minus_one (p, &pp); |
| 595 | |
| 596 | /* Since GDB is not sending a process id (multi-process extensions |
| 597 | are off), then there's only one process. Default to the first in |
| 598 | the list. */ |
| 599 | pid = pid_of (get_first_process ()); |
| 600 | |
| 601 | if (obuf) |
| 602 | *obuf = pp; |
| 603 | return ptid_t (pid, tid, 0); |
| 604 | } |
| 605 | |
| 606 | /* Write COUNT bytes in BUF to the client. |
| 607 | The result is the number of bytes written or -1 if error. |
| 608 | This may return less than COUNT. */ |
| 609 | |
| 610 | static int |
| 611 | write_prim (const void *buf, int count) |
| 612 | { |
| 613 | if (remote_connection_is_stdio ()) |
| 614 | return write (fileno (stdout), buf, count); |
| 615 | else |
| 616 | return write (remote_desc, buf, count); |
| 617 | } |
| 618 | |
| 619 | /* Read COUNT bytes from the client and store in BUF. |
| 620 | The result is the number of bytes read or -1 if error. |
| 621 | This may return less than COUNT. */ |
| 622 | |
| 623 | static int |
| 624 | read_prim (void *buf, int count) |
| 625 | { |
| 626 | if (remote_connection_is_stdio ()) |
| 627 | return read (fileno (stdin), buf, count); |
| 628 | else |
| 629 | return read (remote_desc, buf, count); |
| 630 | } |
| 631 | |
| 632 | /* Send a packet to the remote machine, with error checking. |
| 633 | The data of the packet is in BUF, and the length of the |
| 634 | packet is in CNT. Returns >= 0 on success, -1 otherwise. */ |
| 635 | |
| 636 | static int |
| 637 | putpkt_binary_1 (char *buf, int cnt, int is_notif) |
| 638 | { |
| 639 | client_state &cs = get_client_state (); |
| 640 | int i; |
| 641 | unsigned char csum = 0; |
| 642 | char *buf2; |
| 643 | char *p; |
| 644 | int cc; |
| 645 | |
| 646 | buf2 = (char *) xmalloc (strlen ("$") + cnt + strlen ("#nn") + 1); |
| 647 | |
| 648 | /* Copy the packet into buffer BUF2, encapsulating it |
| 649 | and giving it a checksum. */ |
| 650 | |
| 651 | p = buf2; |
| 652 | if (is_notif) |
| 653 | *p++ = '%'; |
| 654 | else |
| 655 | *p++ = '$'; |
| 656 | |
| 657 | for (i = 0; i < cnt;) |
| 658 | i += try_rle (buf + i, cnt - i, &csum, &p); |
| 659 | |
| 660 | *p++ = '#'; |
| 661 | *p++ = tohex ((csum >> 4) & 0xf); |
| 662 | *p++ = tohex (csum & 0xf); |
| 663 | |
| 664 | *p = '\0'; |
| 665 | |
| 666 | /* Send it over and over until we get a positive ack. */ |
| 667 | |
| 668 | do |
| 669 | { |
| 670 | if (write_prim (buf2, p - buf2) != p - buf2) |
| 671 | { |
| 672 | perror ("putpkt(write)"); |
| 673 | free (buf2); |
| 674 | return -1; |
| 675 | } |
| 676 | |
| 677 | if (cs.noack_mode || is_notif) |
| 678 | { |
| 679 | /* Don't expect an ack then. */ |
| 680 | if (remote_debug) |
| 681 | { |
| 682 | if (is_notif) |
| 683 | debug_printf ("putpkt (\"%s\"); [notif]\n", buf2); |
| 684 | else |
| 685 | debug_printf ("putpkt (\"%s\"); [noack mode]\n", buf2); |
| 686 | debug_flush (); |
| 687 | } |
| 688 | break; |
| 689 | } |
| 690 | |
| 691 | if (remote_debug) |
| 692 | { |
| 693 | debug_printf ("putpkt (\"%s\"); [looking for ack]\n", buf2); |
| 694 | debug_flush (); |
| 695 | } |
| 696 | |
| 697 | cc = readchar (); |
| 698 | |
| 699 | if (cc < 0) |
| 700 | { |
| 701 | free (buf2); |
| 702 | return -1; |
| 703 | } |
| 704 | |
| 705 | if (remote_debug) |
| 706 | { |
| 707 | debug_printf ("[received '%c' (0x%x)]\n", cc, cc); |
| 708 | debug_flush (); |
| 709 | } |
| 710 | |
| 711 | /* Check for an input interrupt while we're here. */ |
| 712 | if (cc == '\003' && current_thread != NULL) |
| 713 | the_target->request_interrupt (); |
| 714 | } |
| 715 | while (cc != '+'); |
| 716 | |
| 717 | free (buf2); |
| 718 | return 1; /* Success! */ |
| 719 | } |
| 720 | |
| 721 | int |
| 722 | putpkt_binary (char *buf, int cnt) |
| 723 | { |
| 724 | return putpkt_binary_1 (buf, cnt, 0); |
| 725 | } |
| 726 | |
| 727 | /* Send a packet to the remote machine, with error checking. The data |
| 728 | of the packet is in BUF, and the packet should be a NUL-terminated |
| 729 | string. Returns >= 0 on success, -1 otherwise. */ |
| 730 | |
| 731 | int |
| 732 | putpkt (char *buf) |
| 733 | { |
| 734 | return putpkt_binary (buf, strlen (buf)); |
| 735 | } |
| 736 | |
| 737 | int |
| 738 | putpkt_notif (char *buf) |
| 739 | { |
| 740 | return putpkt_binary_1 (buf, strlen (buf), 1); |
| 741 | } |
| 742 | |
| 743 | /* Come here when we get an input interrupt from the remote side. This |
| 744 | interrupt should only be active while we are waiting for the child to do |
| 745 | something. Thus this assumes readchar:bufcnt is 0. |
| 746 | About the only thing that should come through is a ^C, which |
| 747 | will cause us to request child interruption. */ |
| 748 | |
| 749 | static void |
| 750 | input_interrupt (int unused) |
| 751 | { |
| 752 | fd_set readset; |
| 753 | struct timeval immediate = { 0, 0 }; |
| 754 | |
| 755 | /* Protect against spurious interrupts. This has been observed to |
| 756 | be a problem under NetBSD 1.4 and 1.5. */ |
| 757 | |
| 758 | FD_ZERO (&readset); |
| 759 | FD_SET (remote_desc, &readset); |
| 760 | if (select (remote_desc + 1, &readset, 0, 0, &immediate) > 0) |
| 761 | { |
| 762 | int cc; |
| 763 | char c = 0; |
| 764 | |
| 765 | cc = read_prim (&c, 1); |
| 766 | |
| 767 | if (cc == 0) |
| 768 | { |
| 769 | fprintf (stderr, "client connection closed\n"); |
| 770 | return; |
| 771 | } |
| 772 | else if (cc != 1 || c != '\003') |
| 773 | { |
| 774 | fprintf (stderr, "input_interrupt, count = %d c = %d ", cc, c); |
| 775 | if (isprint (c)) |
| 776 | fprintf (stderr, "('%c')\n", c); |
| 777 | else |
| 778 | fprintf (stderr, "('\\x%02x')\n", c & 0xff); |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | the_target->request_interrupt (); |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | /* Check if the remote side sent us an interrupt request (^C). */ |
| 787 | void |
| 788 | check_remote_input_interrupt_request (void) |
| 789 | { |
| 790 | /* This function may be called before establishing communications, |
| 791 | therefore we need to validate the remote descriptor. */ |
| 792 | |
| 793 | if (remote_desc == INVALID_DESCRIPTOR) |
| 794 | return; |
| 795 | |
| 796 | input_interrupt (0); |
| 797 | } |
| 798 | |
| 799 | /* Asynchronous I/O support. SIGIO must be unblocked when waiting, |
| 800 | in order to accept Control-C from the client, and must be blocked |
| 801 | when talking to the client. */ |
| 802 | |
| 803 | static void |
| 804 | block_unblock_async_io (int block) |
| 805 | { |
| 806 | #ifndef USE_WIN32API |
| 807 | sigset_t sigio_set; |
| 808 | |
| 809 | sigemptyset (&sigio_set); |
| 810 | sigaddset (&sigio_set, SIGIO); |
| 811 | gdb_sigmask (block ? SIG_BLOCK : SIG_UNBLOCK, &sigio_set, NULL); |
| 812 | #endif |
| 813 | } |
| 814 | |
| 815 | #ifdef __QNX__ |
| 816 | static void |
| 817 | nto_comctrl (int enable) |
| 818 | { |
| 819 | struct sigevent event; |
| 820 | |
| 821 | if (enable) |
| 822 | { |
| 823 | event.sigev_notify = SIGEV_SIGNAL_THREAD; |
| 824 | event.sigev_signo = SIGIO; |
| 825 | event.sigev_code = 0; |
| 826 | event.sigev_value.sival_ptr = NULL; |
| 827 | event.sigev_priority = -1; |
| 828 | ionotify (remote_desc, _NOTIFY_ACTION_POLLARM, _NOTIFY_COND_INPUT, |
| 829 | &event); |
| 830 | } |
| 831 | else |
| 832 | ionotify (remote_desc, _NOTIFY_ACTION_POLL, _NOTIFY_COND_INPUT, NULL); |
| 833 | } |
| 834 | #endif /* __QNX__ */ |
| 835 | |
| 836 | |
| 837 | /* Current state of asynchronous I/O. */ |
| 838 | static int async_io_enabled; |
| 839 | |
| 840 | /* Enable asynchronous I/O. */ |
| 841 | void |
| 842 | enable_async_io (void) |
| 843 | { |
| 844 | if (async_io_enabled) |
| 845 | return; |
| 846 | |
| 847 | block_unblock_async_io (0); |
| 848 | |
| 849 | async_io_enabled = 1; |
| 850 | #ifdef __QNX__ |
| 851 | nto_comctrl (1); |
| 852 | #endif /* __QNX__ */ |
| 853 | } |
| 854 | |
| 855 | /* Disable asynchronous I/O. */ |
| 856 | void |
| 857 | disable_async_io (void) |
| 858 | { |
| 859 | if (!async_io_enabled) |
| 860 | return; |
| 861 | |
| 862 | block_unblock_async_io (1); |
| 863 | |
| 864 | async_io_enabled = 0; |
| 865 | #ifdef __QNX__ |
| 866 | nto_comctrl (0); |
| 867 | #endif /* __QNX__ */ |
| 868 | |
| 869 | } |
| 870 | |
| 871 | void |
| 872 | initialize_async_io (void) |
| 873 | { |
| 874 | /* Make sure that async I/O starts blocked. */ |
| 875 | async_io_enabled = 1; |
| 876 | disable_async_io (); |
| 877 | |
| 878 | /* Install the signal handler. */ |
| 879 | #ifndef USE_WIN32API |
| 880 | signal (SIGIO, input_interrupt); |
| 881 | #endif |
| 882 | } |
| 883 | |
| 884 | /* Internal buffer used by readchar. |
| 885 | These are global to readchar because reschedule_remote needs to be |
| 886 | able to tell whether the buffer is empty. */ |
| 887 | |
| 888 | static unsigned char readchar_buf[BUFSIZ]; |
| 889 | static int readchar_bufcnt = 0; |
| 890 | static unsigned char *readchar_bufp; |
| 891 | |
| 892 | /* Returns next char from remote GDB. -1 if error. */ |
| 893 | |
| 894 | static int |
| 895 | readchar (void) |
| 896 | { |
| 897 | int ch; |
| 898 | |
| 899 | if (readchar_bufcnt == 0) |
| 900 | { |
| 901 | readchar_bufcnt = read_prim (readchar_buf, sizeof (readchar_buf)); |
| 902 | |
| 903 | if (readchar_bufcnt <= 0) |
| 904 | { |
| 905 | if (readchar_bufcnt == 0) |
| 906 | { |
| 907 | if (remote_debug) |
| 908 | debug_printf ("readchar: Got EOF\n"); |
| 909 | } |
| 910 | else |
| 911 | perror ("readchar"); |
| 912 | |
| 913 | return -1; |
| 914 | } |
| 915 | |
| 916 | readchar_bufp = readchar_buf; |
| 917 | } |
| 918 | |
| 919 | readchar_bufcnt--; |
| 920 | ch = *readchar_bufp++; |
| 921 | reschedule (); |
| 922 | return ch; |
| 923 | } |
| 924 | |
| 925 | /* Reset the readchar state machine. */ |
| 926 | |
| 927 | static void |
| 928 | reset_readchar (void) |
| 929 | { |
| 930 | readchar_bufcnt = 0; |
| 931 | if (readchar_callback != NOT_SCHEDULED) |
| 932 | { |
| 933 | delete_callback_event (readchar_callback); |
| 934 | readchar_callback = NOT_SCHEDULED; |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | /* Process remaining data in readchar_buf. */ |
| 939 | |
| 940 | static int |
| 941 | process_remaining (void *context) |
| 942 | { |
| 943 | int res; |
| 944 | |
| 945 | /* This is a one-shot event. */ |
| 946 | readchar_callback = NOT_SCHEDULED; |
| 947 | |
| 948 | if (readchar_bufcnt > 0) |
| 949 | res = handle_serial_event (0, NULL); |
| 950 | else |
| 951 | res = 0; |
| 952 | |
| 953 | return res; |
| 954 | } |
| 955 | |
| 956 | /* If there is still data in the buffer, queue another event to process it, |
| 957 | we can't sleep in select yet. */ |
| 958 | |
| 959 | static void |
| 960 | reschedule (void) |
| 961 | { |
| 962 | if (readchar_bufcnt > 0 && readchar_callback == NOT_SCHEDULED) |
| 963 | readchar_callback = append_callback_event (process_remaining, NULL); |
| 964 | } |
| 965 | |
| 966 | /* Read a packet from the remote machine, with error checking, |
| 967 | and store it in BUF. Returns length of packet, or negative if error. */ |
| 968 | |
| 969 | int |
| 970 | getpkt (char *buf) |
| 971 | { |
| 972 | client_state &cs = get_client_state (); |
| 973 | char *bp; |
| 974 | unsigned char csum, c1, c2; |
| 975 | int c; |
| 976 | |
| 977 | while (1) |
| 978 | { |
| 979 | csum = 0; |
| 980 | |
| 981 | while (1) |
| 982 | { |
| 983 | c = readchar (); |
| 984 | |
| 985 | /* The '\003' may appear before or after each packet, so |
| 986 | check for an input interrupt. */ |
| 987 | if (c == '\003') |
| 988 | { |
| 989 | the_target->request_interrupt (); |
| 990 | continue; |
| 991 | } |
| 992 | |
| 993 | if (c == '$') |
| 994 | break; |
| 995 | if (remote_debug) |
| 996 | { |
| 997 | debug_printf ("[getpkt: discarding char '%c']\n", c); |
| 998 | debug_flush (); |
| 999 | } |
| 1000 | |
| 1001 | if (c < 0) |
| 1002 | return -1; |
| 1003 | } |
| 1004 | |
| 1005 | bp = buf; |
| 1006 | while (1) |
| 1007 | { |
| 1008 | c = readchar (); |
| 1009 | if (c < 0) |
| 1010 | return -1; |
| 1011 | if (c == '#') |
| 1012 | break; |
| 1013 | *bp++ = c; |
| 1014 | csum += c; |
| 1015 | } |
| 1016 | *bp = 0; |
| 1017 | |
| 1018 | c1 = fromhex (readchar ()); |
| 1019 | c2 = fromhex (readchar ()); |
| 1020 | |
| 1021 | if (csum == (c1 << 4) + c2) |
| 1022 | break; |
| 1023 | |
| 1024 | if (cs.noack_mode) |
| 1025 | { |
| 1026 | fprintf (stderr, |
| 1027 | "Bad checksum, sentsum=0x%x, csum=0x%x, " |
| 1028 | "buf=%s [no-ack-mode, Bad medium?]\n", |
| 1029 | (c1 << 4) + c2, csum, buf); |
| 1030 | /* Not much we can do, GDB wasn't expecting an ack/nac. */ |
| 1031 | break; |
| 1032 | } |
| 1033 | |
| 1034 | fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", |
| 1035 | (c1 << 4) + c2, csum, buf); |
| 1036 | if (write_prim ("-", 1) != 1) |
| 1037 | return -1; |
| 1038 | } |
| 1039 | |
| 1040 | if (!cs.noack_mode) |
| 1041 | { |
| 1042 | if (remote_debug) |
| 1043 | { |
| 1044 | debug_printf ("getpkt (\"%s\"); [sending ack] \n", buf); |
| 1045 | debug_flush (); |
| 1046 | } |
| 1047 | |
| 1048 | if (write_prim ("+", 1) != 1) |
| 1049 | return -1; |
| 1050 | |
| 1051 | if (remote_debug) |
| 1052 | { |
| 1053 | debug_printf ("[sent ack]\n"); |
| 1054 | debug_flush (); |
| 1055 | } |
| 1056 | } |
| 1057 | else |
| 1058 | { |
| 1059 | if (remote_debug) |
| 1060 | { |
| 1061 | debug_printf ("getpkt (\"%s\"); [no ack sent] \n", buf); |
| 1062 | debug_flush (); |
| 1063 | } |
| 1064 | } |
| 1065 | |
| 1066 | /* The readchar above may have already read a '\003' out of the socket |
| 1067 | and moved it to the local buffer. For example, when GDB sends |
| 1068 | vCont;c immediately followed by interrupt (see |
| 1069 | gdb.base/interrupt-noterm.exp). As soon as we see the vCont;c, we'll |
| 1070 | resume the inferior and wait. Since we've already moved the '\003' |
| 1071 | to the local buffer, SIGIO won't help. In that case, if we don't |
| 1072 | check for interrupt after the vCont;c packet, the interrupt character |
| 1073 | would stay in the buffer unattended until after the next (unrelated) |
| 1074 | stop. */ |
| 1075 | while (readchar_bufcnt > 0 && *readchar_bufp == '\003') |
| 1076 | { |
| 1077 | /* Consume the interrupt character in the buffer. */ |
| 1078 | readchar (); |
| 1079 | the_target->request_interrupt (); |
| 1080 | } |
| 1081 | |
| 1082 | return bp - buf; |
| 1083 | } |
| 1084 | |
| 1085 | void |
| 1086 | write_ok (char *buf) |
| 1087 | { |
| 1088 | buf[0] = 'O'; |
| 1089 | buf[1] = 'K'; |
| 1090 | buf[2] = '\0'; |
| 1091 | } |
| 1092 | |
| 1093 | void |
| 1094 | write_enn (char *buf) |
| 1095 | { |
| 1096 | /* Some day, we should define the meanings of the error codes... */ |
| 1097 | buf[0] = 'E'; |
| 1098 | buf[1] = '0'; |
| 1099 | buf[2] = '1'; |
| 1100 | buf[3] = '\0'; |
| 1101 | } |
| 1102 | |
| 1103 | #endif |
| 1104 | |
| 1105 | #ifndef IN_PROCESS_AGENT |
| 1106 | |
| 1107 | static char * |
| 1108 | outreg (struct regcache *regcache, int regno, char *buf) |
| 1109 | { |
| 1110 | if ((regno >> 12) != 0) |
| 1111 | *buf++ = tohex ((regno >> 12) & 0xf); |
| 1112 | if ((regno >> 8) != 0) |
| 1113 | *buf++ = tohex ((regno >> 8) & 0xf); |
| 1114 | *buf++ = tohex ((regno >> 4) & 0xf); |
| 1115 | *buf++ = tohex (regno & 0xf); |
| 1116 | *buf++ = ':'; |
| 1117 | collect_register_as_string (regcache, regno, buf); |
| 1118 | buf += 2 * register_size (regcache->tdesc, regno); |
| 1119 | *buf++ = ';'; |
| 1120 | |
| 1121 | return buf; |
| 1122 | } |
| 1123 | |
| 1124 | void |
| 1125 | prepare_resume_reply (char *buf, ptid_t ptid, |
| 1126 | struct target_waitstatus *status) |
| 1127 | { |
| 1128 | client_state &cs = get_client_state (); |
| 1129 | if (debug_threads) |
| 1130 | debug_printf ("Writing resume reply for %s:%d\n", |
| 1131 | target_pid_to_str (ptid), status->kind); |
| 1132 | |
| 1133 | switch (status->kind) |
| 1134 | { |
| 1135 | case TARGET_WAITKIND_STOPPED: |
| 1136 | case TARGET_WAITKIND_FORKED: |
| 1137 | case TARGET_WAITKIND_VFORKED: |
| 1138 | case TARGET_WAITKIND_VFORK_DONE: |
| 1139 | case TARGET_WAITKIND_EXECD: |
| 1140 | case TARGET_WAITKIND_THREAD_CREATED: |
| 1141 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
| 1142 | case TARGET_WAITKIND_SYSCALL_RETURN: |
| 1143 | { |
| 1144 | struct thread_info *saved_thread; |
| 1145 | const char **regp; |
| 1146 | struct regcache *regcache; |
| 1147 | |
| 1148 | if ((status->kind == TARGET_WAITKIND_FORKED && cs.report_fork_events) |
| 1149 | || (status->kind == TARGET_WAITKIND_VFORKED |
| 1150 | && cs.report_vfork_events)) |
| 1151 | { |
| 1152 | enum gdb_signal signal = GDB_SIGNAL_TRAP; |
| 1153 | const char *event = (status->kind == TARGET_WAITKIND_FORKED |
| 1154 | ? "fork" : "vfork"); |
| 1155 | |
| 1156 | sprintf (buf, "T%02x%s:", signal, event); |
| 1157 | buf += strlen (buf); |
| 1158 | buf = write_ptid (buf, status->value.related_pid); |
| 1159 | strcat (buf, ";"); |
| 1160 | } |
| 1161 | else if (status->kind == TARGET_WAITKIND_VFORK_DONE |
| 1162 | && cs.report_vfork_events) |
| 1163 | { |
| 1164 | enum gdb_signal signal = GDB_SIGNAL_TRAP; |
| 1165 | |
| 1166 | sprintf (buf, "T%02xvforkdone:;", signal); |
| 1167 | } |
| 1168 | else if (status->kind == TARGET_WAITKIND_EXECD && cs.report_exec_events) |
| 1169 | { |
| 1170 | enum gdb_signal signal = GDB_SIGNAL_TRAP; |
| 1171 | const char *event = "exec"; |
| 1172 | char hexified_pathname[PATH_MAX * 2]; |
| 1173 | |
| 1174 | sprintf (buf, "T%02x%s:", signal, event); |
| 1175 | buf += strlen (buf); |
| 1176 | |
| 1177 | /* Encode pathname to hexified format. */ |
| 1178 | bin2hex ((const gdb_byte *) status->value.execd_pathname, |
| 1179 | hexified_pathname, |
| 1180 | strlen (status->value.execd_pathname)); |
| 1181 | |
| 1182 | sprintf (buf, "%s;", hexified_pathname); |
| 1183 | xfree (status->value.execd_pathname); |
| 1184 | status->value.execd_pathname = NULL; |
| 1185 | buf += strlen (buf); |
| 1186 | } |
| 1187 | else if (status->kind == TARGET_WAITKIND_THREAD_CREATED |
| 1188 | && cs.report_thread_events) |
| 1189 | { |
| 1190 | enum gdb_signal signal = GDB_SIGNAL_TRAP; |
| 1191 | |
| 1192 | sprintf (buf, "T%02xcreate:;", signal); |
| 1193 | } |
| 1194 | else if (status->kind == TARGET_WAITKIND_SYSCALL_ENTRY |
| 1195 | || status->kind == TARGET_WAITKIND_SYSCALL_RETURN) |
| 1196 | { |
| 1197 | enum gdb_signal signal = GDB_SIGNAL_TRAP; |
| 1198 | const char *event = (status->kind == TARGET_WAITKIND_SYSCALL_ENTRY |
| 1199 | ? "syscall_entry" : "syscall_return"); |
| 1200 | |
| 1201 | sprintf (buf, "T%02x%s:%x;", signal, event, |
| 1202 | status->value.syscall_number); |
| 1203 | } |
| 1204 | else |
| 1205 | sprintf (buf, "T%02x", status->value.sig); |
| 1206 | |
| 1207 | if (disable_packet_T) |
| 1208 | { |
| 1209 | /* This is a bit (OK, a lot) of a kludge, however, this isn't |
| 1210 | really a user feature, but exists only so GDB can use the |
| 1211 | gdbserver to test handling of the 'S' stop reply packet, so |
| 1212 | we would rather this code be as simple as possible. |
| 1213 | |
| 1214 | By this point we've started to build the 'T' stop packet, |
| 1215 | and it should look like 'Txx....' where 'x' is a hex digit. |
| 1216 | An 'S' stop packet always looks like 'Sxx', so all we do |
| 1217 | here is convert the buffer from a T packet to an S packet |
| 1218 | and the avoid adding any extra content by breaking out. */ |
| 1219 | gdb_assert (*buf == 'T'); |
| 1220 | gdb_assert (isxdigit (*(buf + 1))); |
| 1221 | gdb_assert (isxdigit (*(buf + 2))); |
| 1222 | *buf = 'S'; |
| 1223 | *(buf + 3) = '\0'; |
| 1224 | break; |
| 1225 | } |
| 1226 | |
| 1227 | buf += strlen (buf); |
| 1228 | |
| 1229 | saved_thread = current_thread; |
| 1230 | |
| 1231 | switch_to_thread (the_target, ptid); |
| 1232 | |
| 1233 | regp = current_target_desc ()->expedite_regs; |
| 1234 | |
| 1235 | regcache = get_thread_regcache (current_thread, 1); |
| 1236 | |
| 1237 | if (the_target->stopped_by_watchpoint ()) |
| 1238 | { |
| 1239 | CORE_ADDR addr; |
| 1240 | int i; |
| 1241 | |
| 1242 | memcpy (buf, "watch:", 6); |
| 1243 | buf += 6; |
| 1244 | |
| 1245 | addr = the_target->stopped_data_address (); |
| 1246 | |
| 1247 | /* Convert each byte of the address into two hexadecimal |
| 1248 | chars. Note that we take sizeof (void *) instead of |
| 1249 | sizeof (addr); this is to avoid sending a 64-bit |
| 1250 | address to a 32-bit GDB. */ |
| 1251 | for (i = sizeof (void *) * 2; i > 0; i--) |
| 1252 | *buf++ = tohex ((addr >> (i - 1) * 4) & 0xf); |
| 1253 | *buf++ = ';'; |
| 1254 | } |
| 1255 | else if (cs.swbreak_feature && target_stopped_by_sw_breakpoint ()) |
| 1256 | { |
| 1257 | sprintf (buf, "swbreak:;"); |
| 1258 | buf += strlen (buf); |
| 1259 | } |
| 1260 | else if (cs.hwbreak_feature && target_stopped_by_hw_breakpoint ()) |
| 1261 | { |
| 1262 | sprintf (buf, "hwbreak:;"); |
| 1263 | buf += strlen (buf); |
| 1264 | } |
| 1265 | |
| 1266 | while (*regp) |
| 1267 | { |
| 1268 | buf = outreg (regcache, find_regno (regcache->tdesc, *regp), buf); |
| 1269 | regp ++; |
| 1270 | } |
| 1271 | *buf = '\0'; |
| 1272 | |
| 1273 | /* Formerly, if the debugger had not used any thread features |
| 1274 | we would not burden it with a thread status response. This |
| 1275 | was for the benefit of GDB 4.13 and older. However, in |
| 1276 | recent GDB versions the check (``if (cont_thread != 0)'') |
| 1277 | does not have the desired effect because of sillyness in |
| 1278 | the way that the remote protocol handles specifying a |
| 1279 | thread. Since thread support relies on qSymbol support |
| 1280 | anyway, assume GDB can handle threads. */ |
| 1281 | |
| 1282 | if (using_threads && !disable_packet_Tthread) |
| 1283 | { |
| 1284 | /* This if (1) ought to be unnecessary. But remote_wait |
| 1285 | in GDB will claim this event belongs to inferior_ptid |
| 1286 | if we do not specify a thread, and there's no way for |
| 1287 | gdbserver to know what inferior_ptid is. */ |
| 1288 | if (1 || cs.general_thread != ptid) |
| 1289 | { |
| 1290 | int core = -1; |
| 1291 | /* In non-stop, don't change the general thread behind |
| 1292 | GDB's back. */ |
| 1293 | if (!non_stop) |
| 1294 | cs.general_thread = ptid; |
| 1295 | sprintf (buf, "thread:"); |
| 1296 | buf += strlen (buf); |
| 1297 | buf = write_ptid (buf, ptid); |
| 1298 | strcat (buf, ";"); |
| 1299 | buf += strlen (buf); |
| 1300 | |
| 1301 | core = target_core_of_thread (ptid); |
| 1302 | |
| 1303 | if (core != -1) |
| 1304 | { |
| 1305 | sprintf (buf, "core:"); |
| 1306 | buf += strlen (buf); |
| 1307 | sprintf (buf, "%x", core); |
| 1308 | strcat (buf, ";"); |
| 1309 | buf += strlen (buf); |
| 1310 | } |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | if (dlls_changed) |
| 1315 | { |
| 1316 | strcpy (buf, "library:;"); |
| 1317 | buf += strlen (buf); |
| 1318 | dlls_changed = 0; |
| 1319 | } |
| 1320 | |
| 1321 | current_thread = saved_thread; |
| 1322 | } |
| 1323 | break; |
| 1324 | case TARGET_WAITKIND_EXITED: |
| 1325 | if (cs.multi_process) |
| 1326 | sprintf (buf, "W%x;process:%x", |
| 1327 | status->value.integer, ptid.pid ()); |
| 1328 | else |
| 1329 | sprintf (buf, "W%02x", status->value.integer); |
| 1330 | break; |
| 1331 | case TARGET_WAITKIND_SIGNALLED: |
| 1332 | if (cs.multi_process) |
| 1333 | sprintf (buf, "X%x;process:%x", |
| 1334 | status->value.sig, ptid.pid ()); |
| 1335 | else |
| 1336 | sprintf (buf, "X%02x", status->value.sig); |
| 1337 | break; |
| 1338 | case TARGET_WAITKIND_THREAD_EXITED: |
| 1339 | sprintf (buf, "w%x;", status->value.integer); |
| 1340 | buf += strlen (buf); |
| 1341 | buf = write_ptid (buf, ptid); |
| 1342 | break; |
| 1343 | case TARGET_WAITKIND_NO_RESUMED: |
| 1344 | sprintf (buf, "N"); |
| 1345 | break; |
| 1346 | default: |
| 1347 | error ("unhandled waitkind"); |
| 1348 | break; |
| 1349 | } |
| 1350 | } |
| 1351 | |
| 1352 | void |
| 1353 | decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr) |
| 1354 | { |
| 1355 | int i = 0, j = 0; |
| 1356 | char ch; |
| 1357 | *mem_addr_ptr = *len_ptr = 0; |
| 1358 | |
| 1359 | while ((ch = from[i++]) != ',') |
| 1360 | { |
| 1361 | *mem_addr_ptr = *mem_addr_ptr << 4; |
| 1362 | *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| 1363 | } |
| 1364 | |
| 1365 | for (j = 0; j < 4; j++) |
| 1366 | { |
| 1367 | if ((ch = from[i++]) == 0) |
| 1368 | break; |
| 1369 | *len_ptr = *len_ptr << 4; |
| 1370 | *len_ptr |= fromhex (ch) & 0x0f; |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | void |
| 1375 | decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr, |
| 1376 | unsigned char **to_p) |
| 1377 | { |
| 1378 | int i = 0; |
| 1379 | char ch; |
| 1380 | *mem_addr_ptr = *len_ptr = 0; |
| 1381 | |
| 1382 | while ((ch = from[i++]) != ',') |
| 1383 | { |
| 1384 | *mem_addr_ptr = *mem_addr_ptr << 4; |
| 1385 | *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| 1386 | } |
| 1387 | |
| 1388 | while ((ch = from[i++]) != ':') |
| 1389 | { |
| 1390 | *len_ptr = *len_ptr << 4; |
| 1391 | *len_ptr |= fromhex (ch) & 0x0f; |
| 1392 | } |
| 1393 | |
| 1394 | if (*to_p == NULL) |
| 1395 | *to_p = (unsigned char *) xmalloc (*len_ptr); |
| 1396 | |
| 1397 | hex2bin (&from[i++], *to_p, *len_ptr); |
| 1398 | } |
| 1399 | |
| 1400 | int |
| 1401 | decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr, |
| 1402 | unsigned int *len_ptr, unsigned char **to_p) |
| 1403 | { |
| 1404 | int i = 0; |
| 1405 | char ch; |
| 1406 | *mem_addr_ptr = *len_ptr = 0; |
| 1407 | |
| 1408 | while ((ch = from[i++]) != ',') |
| 1409 | { |
| 1410 | *mem_addr_ptr = *mem_addr_ptr << 4; |
| 1411 | *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| 1412 | } |
| 1413 | |
| 1414 | while ((ch = from[i++]) != ':') |
| 1415 | { |
| 1416 | *len_ptr = *len_ptr << 4; |
| 1417 | *len_ptr |= fromhex (ch) & 0x0f; |
| 1418 | } |
| 1419 | |
| 1420 | if (*to_p == NULL) |
| 1421 | *to_p = (unsigned char *) xmalloc (*len_ptr); |
| 1422 | |
| 1423 | if (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i, |
| 1424 | *to_p, *len_ptr) != *len_ptr) |
| 1425 | return -1; |
| 1426 | |
| 1427 | return 0; |
| 1428 | } |
| 1429 | |
| 1430 | /* Decode a qXfer write request. */ |
| 1431 | |
| 1432 | int |
| 1433 | decode_xfer_write (char *buf, int packet_len, CORE_ADDR *offset, |
| 1434 | unsigned int *len, unsigned char *data) |
| 1435 | { |
| 1436 | char ch; |
| 1437 | char *b = buf; |
| 1438 | |
| 1439 | /* Extract the offset. */ |
| 1440 | *offset = 0; |
| 1441 | while ((ch = *buf++) != ':') |
| 1442 | { |
| 1443 | *offset = *offset << 4; |
| 1444 | *offset |= fromhex (ch) & 0x0f; |
| 1445 | } |
| 1446 | |
| 1447 | /* Get encoded data. */ |
| 1448 | packet_len -= buf - b; |
| 1449 | *len = remote_unescape_input ((const gdb_byte *) buf, packet_len, |
| 1450 | data, packet_len); |
| 1451 | return 0; |
| 1452 | } |
| 1453 | |
| 1454 | /* Decode the parameters of a qSearch:memory packet. */ |
| 1455 | |
| 1456 | int |
| 1457 | decode_search_memory_packet (const char *buf, int packet_len, |
| 1458 | CORE_ADDR *start_addrp, |
| 1459 | CORE_ADDR *search_space_lenp, |
| 1460 | gdb_byte *pattern, unsigned int *pattern_lenp) |
| 1461 | { |
| 1462 | const char *p = buf; |
| 1463 | |
| 1464 | p = decode_address_to_semicolon (start_addrp, p); |
| 1465 | p = decode_address_to_semicolon (search_space_lenp, p); |
| 1466 | packet_len -= p - buf; |
| 1467 | *pattern_lenp = remote_unescape_input ((const gdb_byte *) p, packet_len, |
| 1468 | pattern, packet_len); |
| 1469 | return 0; |
| 1470 | } |
| 1471 | |
| 1472 | static void |
| 1473 | free_sym_cache (struct sym_cache *sym) |
| 1474 | { |
| 1475 | if (sym != NULL) |
| 1476 | { |
| 1477 | free (sym->name); |
| 1478 | free (sym); |
| 1479 | } |
| 1480 | } |
| 1481 | |
| 1482 | void |
| 1483 | clear_symbol_cache (struct sym_cache **symcache_p) |
| 1484 | { |
| 1485 | struct sym_cache *sym, *next; |
| 1486 | |
| 1487 | /* Check the cache first. */ |
| 1488 | for (sym = *symcache_p; sym; sym = next) |
| 1489 | { |
| 1490 | next = sym->next; |
| 1491 | free_sym_cache (sym); |
| 1492 | } |
| 1493 | |
| 1494 | *symcache_p = NULL; |
| 1495 | } |
| 1496 | |
| 1497 | /* Get the address of NAME, and return it in ADDRP if found. if |
| 1498 | MAY_ASK_GDB is false, assume symbol cache misses are failures. |
| 1499 | Returns 1 if the symbol is found, 0 if it is not, -1 on error. */ |
| 1500 | |
| 1501 | int |
| 1502 | look_up_one_symbol (const char *name, CORE_ADDR *addrp, int may_ask_gdb) |
| 1503 | { |
| 1504 | client_state &cs = get_client_state (); |
| 1505 | char *p, *q; |
| 1506 | int len; |
| 1507 | struct sym_cache *sym; |
| 1508 | struct process_info *proc; |
| 1509 | |
| 1510 | proc = current_process (); |
| 1511 | |
| 1512 | /* Check the cache first. */ |
| 1513 | for (sym = proc->symbol_cache; sym; sym = sym->next) |
| 1514 | if (strcmp (name, sym->name) == 0) |
| 1515 | { |
| 1516 | *addrp = sym->addr; |
| 1517 | return 1; |
| 1518 | } |
| 1519 | |
| 1520 | /* It might not be an appropriate time to look up a symbol, |
| 1521 | e.g. while we're trying to fetch registers. */ |
| 1522 | if (!may_ask_gdb) |
| 1523 | return 0; |
| 1524 | |
| 1525 | /* Send the request. */ |
| 1526 | strcpy (cs.own_buf, "qSymbol:"); |
| 1527 | bin2hex ((const gdb_byte *) name, cs.own_buf + strlen ("qSymbol:"), |
| 1528 | strlen (name)); |
| 1529 | if (putpkt (cs.own_buf) < 0) |
| 1530 | return -1; |
| 1531 | |
| 1532 | /* FIXME: Eventually add buffer overflow checking (to getpkt?) */ |
| 1533 | len = getpkt (cs.own_buf); |
| 1534 | if (len < 0) |
| 1535 | return -1; |
| 1536 | |
| 1537 | /* We ought to handle pretty much any packet at this point while we |
| 1538 | wait for the qSymbol "response". That requires re-entering the |
| 1539 | main loop. For now, this is an adequate approximation; allow |
| 1540 | GDB to read from memory and handle 'v' packets (for vFile transfers) |
| 1541 | while it figures out the address of the symbol. */ |
| 1542 | while (1) |
| 1543 | { |
| 1544 | if (cs.own_buf[0] == 'm') |
| 1545 | { |
| 1546 | CORE_ADDR mem_addr; |
| 1547 | unsigned char *mem_buf; |
| 1548 | unsigned int mem_len; |
| 1549 | |
| 1550 | decode_m_packet (&cs.own_buf[1], &mem_addr, &mem_len); |
| 1551 | mem_buf = (unsigned char *) xmalloc (mem_len); |
| 1552 | if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0) |
| 1553 | bin2hex (mem_buf, cs.own_buf, mem_len); |
| 1554 | else |
| 1555 | write_enn (cs.own_buf); |
| 1556 | free (mem_buf); |
| 1557 | if (putpkt (cs.own_buf) < 0) |
| 1558 | return -1; |
| 1559 | } |
| 1560 | else if (cs.own_buf[0] == 'v') |
| 1561 | { |
| 1562 | int new_len = -1; |
| 1563 | handle_v_requests (cs.own_buf, len, &new_len); |
| 1564 | if (new_len != -1) |
| 1565 | putpkt_binary (cs.own_buf, new_len); |
| 1566 | else |
| 1567 | putpkt (cs.own_buf); |
| 1568 | } |
| 1569 | else |
| 1570 | break; |
| 1571 | len = getpkt (cs.own_buf); |
| 1572 | if (len < 0) |
| 1573 | return -1; |
| 1574 | } |
| 1575 | |
| 1576 | if (!startswith (cs.own_buf, "qSymbol:")) |
| 1577 | { |
| 1578 | warning ("Malformed response to qSymbol, ignoring: %s", cs.own_buf); |
| 1579 | return -1; |
| 1580 | } |
| 1581 | |
| 1582 | p = cs.own_buf + strlen ("qSymbol:"); |
| 1583 | q = p; |
| 1584 | while (*q && *q != ':') |
| 1585 | q++; |
| 1586 | |
| 1587 | /* Make sure we found a value for the symbol. */ |
| 1588 | if (p == q || *q == '\0') |
| 1589 | return 0; |
| 1590 | |
| 1591 | decode_address (addrp, p, q - p); |
| 1592 | |
| 1593 | /* Save the symbol in our cache. */ |
| 1594 | sym = XNEW (struct sym_cache); |
| 1595 | sym->name = xstrdup (name); |
| 1596 | sym->addr = *addrp; |
| 1597 | sym->next = proc->symbol_cache; |
| 1598 | proc->symbol_cache = sym; |
| 1599 | |
| 1600 | return 1; |
| 1601 | } |
| 1602 | |
| 1603 | /* Relocate an instruction to execute at a different address. OLDLOC |
| 1604 | is the address in the inferior memory where the instruction to |
| 1605 | relocate is currently at. On input, TO points to the destination |
| 1606 | where we want the instruction to be copied (and possibly adjusted) |
| 1607 | to. On output, it points to one past the end of the resulting |
| 1608 | instruction(s). The effect of executing the instruction at TO |
| 1609 | shall be the same as if executing it at OLDLOC. For example, call |
| 1610 | instructions that implicitly push the return address on the stack |
| 1611 | should be adjusted to return to the instruction after OLDLOC; |
| 1612 | relative branches, and other PC-relative instructions need the |
| 1613 | offset adjusted; etc. Returns 0 on success, -1 on failure. */ |
| 1614 | |
| 1615 | int |
| 1616 | relocate_instruction (CORE_ADDR *to, CORE_ADDR oldloc) |
| 1617 | { |
| 1618 | client_state &cs = get_client_state (); |
| 1619 | int len; |
| 1620 | ULONGEST written = 0; |
| 1621 | |
| 1622 | /* Send the request. */ |
| 1623 | sprintf (cs.own_buf, "qRelocInsn:%s;%s", paddress (oldloc), |
| 1624 | paddress (*to)); |
| 1625 | if (putpkt (cs.own_buf) < 0) |
| 1626 | return -1; |
| 1627 | |
| 1628 | /* FIXME: Eventually add buffer overflow checking (to getpkt?) */ |
| 1629 | len = getpkt (cs.own_buf); |
| 1630 | if (len < 0) |
| 1631 | return -1; |
| 1632 | |
| 1633 | /* We ought to handle pretty much any packet at this point while we |
| 1634 | wait for the qRelocInsn "response". That requires re-entering |
| 1635 | the main loop. For now, this is an adequate approximation; allow |
| 1636 | GDB to access memory. */ |
| 1637 | while (cs.own_buf[0] == 'm' || cs.own_buf[0] == 'M' || cs.own_buf[0] == 'X') |
| 1638 | { |
| 1639 | CORE_ADDR mem_addr; |
| 1640 | unsigned char *mem_buf = NULL; |
| 1641 | unsigned int mem_len; |
| 1642 | |
| 1643 | if (cs.own_buf[0] == 'm') |
| 1644 | { |
| 1645 | decode_m_packet (&cs.own_buf[1], &mem_addr, &mem_len); |
| 1646 | mem_buf = (unsigned char *) xmalloc (mem_len); |
| 1647 | if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0) |
| 1648 | bin2hex (mem_buf, cs.own_buf, mem_len); |
| 1649 | else |
| 1650 | write_enn (cs.own_buf); |
| 1651 | } |
| 1652 | else if (cs.own_buf[0] == 'X') |
| 1653 | { |
| 1654 | if (decode_X_packet (&cs.own_buf[1], len - 1, &mem_addr, |
| 1655 | &mem_len, &mem_buf) < 0 |
| 1656 | || target_write_memory (mem_addr, mem_buf, mem_len) != 0) |
| 1657 | write_enn (cs.own_buf); |
| 1658 | else |
| 1659 | write_ok (cs.own_buf); |
| 1660 | } |
| 1661 | else |
| 1662 | { |
| 1663 | decode_M_packet (&cs.own_buf[1], &mem_addr, &mem_len, &mem_buf); |
| 1664 | if (target_write_memory (mem_addr, mem_buf, mem_len) == 0) |
| 1665 | write_ok (cs.own_buf); |
| 1666 | else |
| 1667 | write_enn (cs.own_buf); |
| 1668 | } |
| 1669 | free (mem_buf); |
| 1670 | if (putpkt (cs.own_buf) < 0) |
| 1671 | return -1; |
| 1672 | len = getpkt (cs.own_buf); |
| 1673 | if (len < 0) |
| 1674 | return -1; |
| 1675 | } |
| 1676 | |
| 1677 | if (cs.own_buf[0] == 'E') |
| 1678 | { |
| 1679 | warning ("An error occurred while relocating an instruction: %s", |
| 1680 | cs.own_buf); |
| 1681 | return -1; |
| 1682 | } |
| 1683 | |
| 1684 | if (!startswith (cs.own_buf, "qRelocInsn:")) |
| 1685 | { |
| 1686 | warning ("Malformed response to qRelocInsn, ignoring: %s", |
| 1687 | cs.own_buf); |
| 1688 | return -1; |
| 1689 | } |
| 1690 | |
| 1691 | unpack_varlen_hex (cs.own_buf + strlen ("qRelocInsn:"), &written); |
| 1692 | |
| 1693 | *to += written; |
| 1694 | return 0; |
| 1695 | } |
| 1696 | |
| 1697 | void |
| 1698 | monitor_output (const char *msg) |
| 1699 | { |
| 1700 | int len = strlen (msg); |
| 1701 | char *buf = (char *) xmalloc (len * 2 + 2); |
| 1702 | |
| 1703 | buf[0] = 'O'; |
| 1704 | bin2hex ((const gdb_byte *) msg, buf + 1, len); |
| 1705 | |
| 1706 | putpkt (buf); |
| 1707 | free (buf); |
| 1708 | } |
| 1709 | |
| 1710 | #endif |