| 1 | /* Remote utility routines for the remote server for GDB. |
| 2 | Copyright (C) 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | #include "terminal.h" |
| 24 | #include <stdio.h> |
| 25 | #include <string.h> |
| 26 | #if HAVE_SYS_IOCTL_H |
| 27 | #include <sys/ioctl.h> |
| 28 | #endif |
| 29 | #include <sys/file.h> |
| 30 | #if HAVE_NETINET_IN_H |
| 31 | #include <netinet/in.h> |
| 32 | #endif |
| 33 | #if HAVE_SYS_SOCKET_H |
| 34 | #include <sys/socket.h> |
| 35 | #endif |
| 36 | #if HAVE_NETDB_H |
| 37 | #include <netdb.h> |
| 38 | #endif |
| 39 | #if HAVE_NETINET_TCP_H |
| 40 | #include <netinet/tcp.h> |
| 41 | #endif |
| 42 | #if HAVE_SYS_IOCTL_H |
| 43 | #include <sys/ioctl.h> |
| 44 | #endif |
| 45 | #include <signal.h> |
| 46 | #include <fcntl.h> |
| 47 | #include <sys/time.h> |
| 48 | #include <unistd.h> |
| 49 | #if HAVE_ARPA_INET_H |
| 50 | #include <arpa/inet.h> |
| 51 | #endif |
| 52 | #include <sys/stat.h> |
| 53 | #include <errno.h> |
| 54 | |
| 55 | #if USE_WIN32API |
| 56 | #include <winsock.h> |
| 57 | #endif |
| 58 | |
| 59 | #ifndef HAVE_SOCKLEN_T |
| 60 | typedef int socklen_t; |
| 61 | #endif |
| 62 | |
| 63 | /* A cache entry for a successfully looked-up symbol. */ |
| 64 | struct sym_cache |
| 65 | { |
| 66 | const char *name; |
| 67 | CORE_ADDR addr; |
| 68 | struct sym_cache *next; |
| 69 | }; |
| 70 | |
| 71 | /* The symbol cache. */ |
| 72 | static struct sym_cache *symbol_cache; |
| 73 | |
| 74 | /* If this flag has been set, assume cache misses are |
| 75 | failures. */ |
| 76 | int all_symbols_looked_up; |
| 77 | |
| 78 | int remote_debug = 0; |
| 79 | struct ui_file *gdb_stdlog; |
| 80 | |
| 81 | static int remote_desc; |
| 82 | |
| 83 | /* FIXME headerize? */ |
| 84 | extern int using_threads; |
| 85 | extern int debug_threads; |
| 86 | |
| 87 | #ifdef USE_WIN32API |
| 88 | # define read(fd, buf, len) recv (fd, buf, len, 0) |
| 89 | # define write(fd, buf, len) send (fd, buf, len, 0) |
| 90 | #endif |
| 91 | |
| 92 | /* Open a connection to a remote debugger. |
| 93 | NAME is the filename used for communication. */ |
| 94 | |
| 95 | void |
| 96 | remote_open (char *name) |
| 97 | { |
| 98 | #if defined(F_SETFL) && defined (FASYNC) |
| 99 | int save_fcntl_flags; |
| 100 | #endif |
| 101 | char *port_str; |
| 102 | |
| 103 | port_str = strchr (name, ':'); |
| 104 | if (port_str == NULL) |
| 105 | { |
| 106 | #ifdef USE_WIN32API |
| 107 | error ("Only <host>:<port> is supported on this platform."); |
| 108 | #else |
| 109 | struct stat statbuf; |
| 110 | |
| 111 | if (stat (name, &statbuf) == 0 |
| 112 | && (S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode))) |
| 113 | remote_desc = open (name, O_RDWR); |
| 114 | else |
| 115 | { |
| 116 | errno = EINVAL; |
| 117 | remote_desc = -1; |
| 118 | } |
| 119 | |
| 120 | if (remote_desc < 0) |
| 121 | perror_with_name ("Could not open remote device"); |
| 122 | |
| 123 | #ifdef HAVE_TERMIOS |
| 124 | { |
| 125 | struct termios termios; |
| 126 | tcgetattr (remote_desc, &termios); |
| 127 | |
| 128 | termios.c_iflag = 0; |
| 129 | termios.c_oflag = 0; |
| 130 | termios.c_lflag = 0; |
| 131 | termios.c_cflag &= ~(CSIZE | PARENB); |
| 132 | termios.c_cflag |= CLOCAL | CS8; |
| 133 | termios.c_cc[VMIN] = 1; |
| 134 | termios.c_cc[VTIME] = 0; |
| 135 | |
| 136 | tcsetattr (remote_desc, TCSANOW, &termios); |
| 137 | } |
| 138 | #endif |
| 139 | |
| 140 | #ifdef HAVE_TERMIO |
| 141 | { |
| 142 | struct termio termio; |
| 143 | ioctl (remote_desc, TCGETA, &termio); |
| 144 | |
| 145 | termio.c_iflag = 0; |
| 146 | termio.c_oflag = 0; |
| 147 | termio.c_lflag = 0; |
| 148 | termio.c_cflag &= ~(CSIZE | PARENB); |
| 149 | termio.c_cflag |= CLOCAL | CS8; |
| 150 | termio.c_cc[VMIN] = 1; |
| 151 | termio.c_cc[VTIME] = 0; |
| 152 | |
| 153 | ioctl (remote_desc, TCSETA, &termio); |
| 154 | } |
| 155 | #endif |
| 156 | |
| 157 | #ifdef HAVE_SGTTY |
| 158 | { |
| 159 | struct sgttyb sg; |
| 160 | |
| 161 | ioctl (remote_desc, TIOCGETP, &sg); |
| 162 | sg.sg_flags = RAW; |
| 163 | ioctl (remote_desc, TIOCSETP, &sg); |
| 164 | } |
| 165 | #endif |
| 166 | |
| 167 | fprintf (stderr, "Remote debugging using %s\n", name); |
| 168 | #endif /* USE_WIN32API */ |
| 169 | } |
| 170 | else |
| 171 | { |
| 172 | #ifdef USE_WIN32API |
| 173 | static int winsock_initialized; |
| 174 | #endif |
| 175 | char *port_str; |
| 176 | int port; |
| 177 | struct sockaddr_in sockaddr; |
| 178 | socklen_t tmp; |
| 179 | int tmp_desc; |
| 180 | |
| 181 | port_str = strchr (name, ':'); |
| 182 | |
| 183 | port = atoi (port_str + 1); |
| 184 | |
| 185 | #ifdef USE_WIN32API |
| 186 | if (!winsock_initialized) |
| 187 | { |
| 188 | WSADATA wsad; |
| 189 | |
| 190 | WSAStartup (MAKEWORD (1, 0), &wsad); |
| 191 | winsock_initialized = 1; |
| 192 | } |
| 193 | #endif |
| 194 | |
| 195 | tmp_desc = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 196 | if (tmp_desc < 0) |
| 197 | perror_with_name ("Can't open socket"); |
| 198 | |
| 199 | /* Allow rapid reuse of this port. */ |
| 200 | tmp = 1; |
| 201 | setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, |
| 202 | sizeof (tmp)); |
| 203 | |
| 204 | sockaddr.sin_family = PF_INET; |
| 205 | sockaddr.sin_port = htons (port); |
| 206 | sockaddr.sin_addr.s_addr = INADDR_ANY; |
| 207 | |
| 208 | if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) |
| 209 | || listen (tmp_desc, 1)) |
| 210 | perror_with_name ("Can't bind address"); |
| 211 | |
| 212 | fprintf (stderr, "Listening on port %d\n", port); |
| 213 | fflush (stderr); |
| 214 | |
| 215 | tmp = sizeof (sockaddr); |
| 216 | remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp); |
| 217 | if (remote_desc == -1) |
| 218 | perror_with_name ("Accept failed"); |
| 219 | |
| 220 | /* Enable TCP keep alive process. */ |
| 221 | tmp = 1; |
| 222 | setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp)); |
| 223 | |
| 224 | /* Tell TCP not to delay small packets. This greatly speeds up |
| 225 | interactive response. */ |
| 226 | tmp = 1; |
| 227 | setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY, |
| 228 | (char *) &tmp, sizeof (tmp)); |
| 229 | |
| 230 | |
| 231 | #ifndef USE_WIN32API |
| 232 | close (tmp_desc); /* No longer need this */ |
| 233 | |
| 234 | signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply |
| 235 | exits when the remote side dies. */ |
| 236 | #else |
| 237 | closesocket (tmp_desc); /* No longer need this */ |
| 238 | #endif |
| 239 | |
| 240 | /* Convert IP address to string. */ |
| 241 | fprintf (stderr, "Remote debugging from host %s\n", |
| 242 | inet_ntoa (sockaddr.sin_addr)); |
| 243 | } |
| 244 | |
| 245 | #if defined(F_SETFL) && defined (FASYNC) |
| 246 | save_fcntl_flags = fcntl (remote_desc, F_GETFL, 0); |
| 247 | fcntl (remote_desc, F_SETFL, save_fcntl_flags | FASYNC); |
| 248 | #if defined (F_SETOWN) |
| 249 | fcntl (remote_desc, F_SETOWN, getpid ()); |
| 250 | #endif |
| 251 | #endif |
| 252 | disable_async_io (); |
| 253 | } |
| 254 | |
| 255 | void |
| 256 | remote_close (void) |
| 257 | { |
| 258 | #ifdef USE_WIN32API |
| 259 | closesocket (remote_desc); |
| 260 | #else |
| 261 | close (remote_desc); |
| 262 | #endif |
| 263 | } |
| 264 | |
| 265 | /* Convert hex digit A to a number. */ |
| 266 | |
| 267 | static int |
| 268 | fromhex (int a) |
| 269 | { |
| 270 | if (a >= '0' && a <= '9') |
| 271 | return a - '0'; |
| 272 | else if (a >= 'a' && a <= 'f') |
| 273 | return a - 'a' + 10; |
| 274 | else |
| 275 | error ("Reply contains invalid hex digit"); |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | int |
| 280 | unhexify (char *bin, const char *hex, int count) |
| 281 | { |
| 282 | int i; |
| 283 | |
| 284 | for (i = 0; i < count; i++) |
| 285 | { |
| 286 | if (hex[0] == 0 || hex[1] == 0) |
| 287 | { |
| 288 | /* Hex string is short, or of uneven length. |
| 289 | Return the count that has been converted so far. */ |
| 290 | return i; |
| 291 | } |
| 292 | *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]); |
| 293 | hex += 2; |
| 294 | } |
| 295 | return i; |
| 296 | } |
| 297 | |
| 298 | void |
| 299 | decode_address (CORE_ADDR *addrp, const char *start, int len) |
| 300 | { |
| 301 | CORE_ADDR addr; |
| 302 | char ch; |
| 303 | int i; |
| 304 | |
| 305 | addr = 0; |
| 306 | for (i = 0; i < len; i++) |
| 307 | { |
| 308 | ch = start[i]; |
| 309 | addr = addr << 4; |
| 310 | addr = addr | (fromhex (ch) & 0x0f); |
| 311 | } |
| 312 | *addrp = addr; |
| 313 | } |
| 314 | |
| 315 | const char * |
| 316 | decode_address_to_semicolon (CORE_ADDR *addrp, const char *start) |
| 317 | { |
| 318 | const char *end; |
| 319 | |
| 320 | end = start; |
| 321 | while (*end != '\0' && *end != ';') |
| 322 | end++; |
| 323 | |
| 324 | decode_address (addrp, start, end - start); |
| 325 | |
| 326 | if (*end == ';') |
| 327 | end++; |
| 328 | return end; |
| 329 | } |
| 330 | |
| 331 | /* Convert number NIB to a hex digit. */ |
| 332 | |
| 333 | static int |
| 334 | tohex (int nib) |
| 335 | { |
| 336 | if (nib < 10) |
| 337 | return '0' + nib; |
| 338 | else |
| 339 | return 'a' + nib - 10; |
| 340 | } |
| 341 | |
| 342 | int |
| 343 | hexify (char *hex, const char *bin, int count) |
| 344 | { |
| 345 | int i; |
| 346 | |
| 347 | /* May use a length, or a nul-terminated string as input. */ |
| 348 | if (count == 0) |
| 349 | count = strlen (bin); |
| 350 | |
| 351 | for (i = 0; i < count; i++) |
| 352 | { |
| 353 | *hex++ = tohex ((*bin >> 4) & 0xf); |
| 354 | *hex++ = tohex (*bin++ & 0xf); |
| 355 | } |
| 356 | *hex = 0; |
| 357 | return i; |
| 358 | } |
| 359 | |
| 360 | /* Convert BUFFER, binary data at least LEN bytes long, into escaped |
| 361 | binary data in OUT_BUF. Set *OUT_LEN to the length of the data |
| 362 | encoded in OUT_BUF, and return the number of bytes in OUT_BUF |
| 363 | (which may be more than *OUT_LEN due to escape characters). The |
| 364 | total number of bytes in the output buffer will be at most |
| 365 | OUT_MAXLEN. */ |
| 366 | |
| 367 | int |
| 368 | remote_escape_output (const gdb_byte *buffer, int len, |
| 369 | gdb_byte *out_buf, int *out_len, |
| 370 | int out_maxlen) |
| 371 | { |
| 372 | int input_index, output_index; |
| 373 | |
| 374 | output_index = 0; |
| 375 | for (input_index = 0; input_index < len; input_index++) |
| 376 | { |
| 377 | gdb_byte b = buffer[input_index]; |
| 378 | |
| 379 | if (b == '$' || b == '#' || b == '}' || b == '*') |
| 380 | { |
| 381 | /* These must be escaped. */ |
| 382 | if (output_index + 2 > out_maxlen) |
| 383 | break; |
| 384 | out_buf[output_index++] = '}'; |
| 385 | out_buf[output_index++] = b ^ 0x20; |
| 386 | } |
| 387 | else |
| 388 | { |
| 389 | if (output_index + 1 > out_maxlen) |
| 390 | break; |
| 391 | out_buf[output_index++] = b; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | *out_len = input_index; |
| 396 | return output_index; |
| 397 | } |
| 398 | |
| 399 | /* Convert BUFFER, escaped data LEN bytes long, into binary data |
| 400 | in OUT_BUF. Return the number of bytes written to OUT_BUF. |
| 401 | Raise an error if the total number of bytes exceeds OUT_MAXLEN. |
| 402 | |
| 403 | This function reverses remote_escape_output. It allows more |
| 404 | escaped characters than that function does, in particular because |
| 405 | '*' must be escaped to avoid the run-length encoding processing |
| 406 | in reading packets. */ |
| 407 | |
| 408 | static int |
| 409 | remote_unescape_input (const gdb_byte *buffer, int len, |
| 410 | gdb_byte *out_buf, int out_maxlen) |
| 411 | { |
| 412 | int input_index, output_index; |
| 413 | int escaped; |
| 414 | |
| 415 | output_index = 0; |
| 416 | escaped = 0; |
| 417 | for (input_index = 0; input_index < len; input_index++) |
| 418 | { |
| 419 | gdb_byte b = buffer[input_index]; |
| 420 | |
| 421 | if (output_index + 1 > out_maxlen) |
| 422 | error ("Received too much data from the target."); |
| 423 | |
| 424 | if (escaped) |
| 425 | { |
| 426 | out_buf[output_index++] = b ^ 0x20; |
| 427 | escaped = 0; |
| 428 | } |
| 429 | else if (b == '}') |
| 430 | escaped = 1; |
| 431 | else |
| 432 | out_buf[output_index++] = b; |
| 433 | } |
| 434 | |
| 435 | if (escaped) |
| 436 | error ("Unmatched escape character in target response."); |
| 437 | |
| 438 | return output_index; |
| 439 | } |
| 440 | |
| 441 | /* Look for a sequence of characters which can be run-length encoded. |
| 442 | If there are any, update *CSUM and *P. Otherwise, output the |
| 443 | single character. Return the number of characters consumed. */ |
| 444 | |
| 445 | static int |
| 446 | try_rle (char *buf, int remaining, unsigned char *csum, char **p) |
| 447 | { |
| 448 | int n; |
| 449 | |
| 450 | /* Always output the character. */ |
| 451 | *csum += buf[0]; |
| 452 | *(*p)++ = buf[0]; |
| 453 | |
| 454 | /* Don't go past '~'. */ |
| 455 | if (remaining > 97) |
| 456 | remaining = 97; |
| 457 | |
| 458 | for (n = 1; n < remaining; n++) |
| 459 | if (buf[n] != buf[0]) |
| 460 | break; |
| 461 | |
| 462 | /* N is the index of the first character not the same as buf[0]. |
| 463 | buf[0] is counted twice, so by decrementing N, we get the number |
| 464 | of characters the RLE sequence will replace. */ |
| 465 | n--; |
| 466 | |
| 467 | if (n < 3) |
| 468 | return 1; |
| 469 | |
| 470 | /* Skip the frame characters. The manual says to skip '+' and '-' |
| 471 | also, but there's no reason to. Unfortunately these two unusable |
| 472 | characters double the encoded length of a four byte zero |
| 473 | value. */ |
| 474 | while (n + 29 == '$' || n + 29 == '#') |
| 475 | n--; |
| 476 | |
| 477 | *csum += '*'; |
| 478 | *(*p)++ = '*'; |
| 479 | *csum += n + 29; |
| 480 | *(*p)++ = n + 29; |
| 481 | |
| 482 | return n + 1; |
| 483 | } |
| 484 | |
| 485 | /* Send a packet to the remote machine, with error checking. |
| 486 | The data of the packet is in BUF, and the length of the |
| 487 | packet is in CNT. Returns >= 0 on success, -1 otherwise. */ |
| 488 | |
| 489 | int |
| 490 | putpkt_binary (char *buf, int cnt) |
| 491 | { |
| 492 | int i; |
| 493 | unsigned char csum = 0; |
| 494 | char *buf2; |
| 495 | char buf3[1]; |
| 496 | char *p; |
| 497 | |
| 498 | buf2 = malloc (PBUFSIZ); |
| 499 | |
| 500 | /* Copy the packet into buffer BUF2, encapsulating it |
| 501 | and giving it a checksum. */ |
| 502 | |
| 503 | p = buf2; |
| 504 | *p++ = '$'; |
| 505 | |
| 506 | for (i = 0; i < cnt;) |
| 507 | i += try_rle (buf + i, cnt - i, &csum, &p); |
| 508 | |
| 509 | *p++ = '#'; |
| 510 | *p++ = tohex ((csum >> 4) & 0xf); |
| 511 | *p++ = tohex (csum & 0xf); |
| 512 | |
| 513 | *p = '\0'; |
| 514 | |
| 515 | /* Send it over and over until we get a positive ack. */ |
| 516 | |
| 517 | do |
| 518 | { |
| 519 | int cc; |
| 520 | |
| 521 | if (write (remote_desc, buf2, p - buf2) != p - buf2) |
| 522 | { |
| 523 | perror ("putpkt(write)"); |
| 524 | return -1; |
| 525 | } |
| 526 | |
| 527 | if (remote_debug) |
| 528 | { |
| 529 | fprintf (stderr, "putpkt (\"%s\"); [looking for ack]\n", buf2); |
| 530 | fflush (stderr); |
| 531 | } |
| 532 | cc = read (remote_desc, buf3, 1); |
| 533 | if (remote_debug) |
| 534 | { |
| 535 | fprintf (stderr, "[received '%c' (0x%x)]\n", buf3[0], buf3[0]); |
| 536 | fflush (stderr); |
| 537 | } |
| 538 | |
| 539 | if (cc <= 0) |
| 540 | { |
| 541 | if (cc == 0) |
| 542 | fprintf (stderr, "putpkt(read): Got EOF\n"); |
| 543 | else |
| 544 | perror ("putpkt(read)"); |
| 545 | |
| 546 | free (buf2); |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | /* Check for an input interrupt while we're here. */ |
| 551 | if (buf3[0] == '\003') |
| 552 | (*the_target->request_interrupt) (); |
| 553 | } |
| 554 | while (buf3[0] != '+'); |
| 555 | |
| 556 | free (buf2); |
| 557 | return 1; /* Success! */ |
| 558 | } |
| 559 | |
| 560 | /* Send a packet to the remote machine, with error checking. The data |
| 561 | of the packet is in BUF, and the packet should be a NUL-terminated |
| 562 | string. Returns >= 0 on success, -1 otherwise. */ |
| 563 | |
| 564 | int |
| 565 | putpkt (char *buf) |
| 566 | { |
| 567 | return putpkt_binary (buf, strlen (buf)); |
| 568 | } |
| 569 | |
| 570 | #ifndef USE_WIN32API |
| 571 | |
| 572 | /* Come here when we get an input interrupt from the remote side. This |
| 573 | interrupt should only be active while we are waiting for the child to do |
| 574 | something. About the only thing that should come through is a ^C, which |
| 575 | will cause us to request child interruption. */ |
| 576 | |
| 577 | static void |
| 578 | input_interrupt (int unused) |
| 579 | { |
| 580 | fd_set readset; |
| 581 | struct timeval immediate = { 0, 0 }; |
| 582 | |
| 583 | /* Protect against spurious interrupts. This has been observed to |
| 584 | be a problem under NetBSD 1.4 and 1.5. */ |
| 585 | |
| 586 | FD_ZERO (&readset); |
| 587 | FD_SET (remote_desc, &readset); |
| 588 | if (select (remote_desc + 1, &readset, 0, 0, &immediate) > 0) |
| 589 | { |
| 590 | int cc; |
| 591 | char c = 0; |
| 592 | |
| 593 | cc = read (remote_desc, &c, 1); |
| 594 | |
| 595 | if (cc != 1 || c != '\003') |
| 596 | { |
| 597 | fprintf (stderr, "input_interrupt, count = %d c = %d ('%c')\n", |
| 598 | cc, c, c); |
| 599 | return; |
| 600 | } |
| 601 | |
| 602 | (*the_target->request_interrupt) (); |
| 603 | } |
| 604 | } |
| 605 | #endif |
| 606 | |
| 607 | /* Asynchronous I/O support. SIGIO must be enabled when waiting, in order to |
| 608 | accept Control-C from the client, and must be disabled when talking to |
| 609 | the client. */ |
| 610 | |
| 611 | void |
| 612 | block_async_io (void) |
| 613 | { |
| 614 | #ifndef USE_WIN32API |
| 615 | sigset_t sigio_set; |
| 616 | sigemptyset (&sigio_set); |
| 617 | sigaddset (&sigio_set, SIGIO); |
| 618 | sigprocmask (SIG_BLOCK, &sigio_set, NULL); |
| 619 | #endif |
| 620 | } |
| 621 | |
| 622 | void |
| 623 | unblock_async_io (void) |
| 624 | { |
| 625 | #ifndef USE_WIN32API |
| 626 | sigset_t sigio_set; |
| 627 | sigemptyset (&sigio_set); |
| 628 | sigaddset (&sigio_set, SIGIO); |
| 629 | sigprocmask (SIG_UNBLOCK, &sigio_set, NULL); |
| 630 | #endif |
| 631 | } |
| 632 | |
| 633 | /* Current state of asynchronous I/O. */ |
| 634 | static int async_io_enabled; |
| 635 | |
| 636 | /* Enable asynchronous I/O. */ |
| 637 | void |
| 638 | enable_async_io (void) |
| 639 | { |
| 640 | if (async_io_enabled) |
| 641 | return; |
| 642 | |
| 643 | #ifndef USE_WIN32API |
| 644 | signal (SIGIO, input_interrupt); |
| 645 | #endif |
| 646 | async_io_enabled = 1; |
| 647 | } |
| 648 | |
| 649 | /* Disable asynchronous I/O. */ |
| 650 | void |
| 651 | disable_async_io (void) |
| 652 | { |
| 653 | if (!async_io_enabled) |
| 654 | return; |
| 655 | |
| 656 | #ifndef USE_WIN32API |
| 657 | signal (SIGIO, SIG_IGN); |
| 658 | #endif |
| 659 | async_io_enabled = 0; |
| 660 | } |
| 661 | |
| 662 | /* Returns next char from remote GDB. -1 if error. */ |
| 663 | |
| 664 | static int |
| 665 | readchar (void) |
| 666 | { |
| 667 | static unsigned char buf[BUFSIZ]; |
| 668 | static int bufcnt = 0; |
| 669 | static unsigned char *bufp; |
| 670 | |
| 671 | if (bufcnt-- > 0) |
| 672 | return *bufp++; |
| 673 | |
| 674 | bufcnt = read (remote_desc, buf, sizeof (buf)); |
| 675 | |
| 676 | if (bufcnt <= 0) |
| 677 | { |
| 678 | if (bufcnt == 0) |
| 679 | fprintf (stderr, "readchar: Got EOF\n"); |
| 680 | else |
| 681 | perror ("readchar"); |
| 682 | |
| 683 | return -1; |
| 684 | } |
| 685 | |
| 686 | bufp = buf; |
| 687 | bufcnt--; |
| 688 | return *bufp++ & 0x7f; |
| 689 | } |
| 690 | |
| 691 | /* Read a packet from the remote machine, with error checking, |
| 692 | and store it in BUF. Returns length of packet, or negative if error. */ |
| 693 | |
| 694 | int |
| 695 | getpkt (char *buf) |
| 696 | { |
| 697 | char *bp; |
| 698 | unsigned char csum, c1, c2; |
| 699 | int c; |
| 700 | |
| 701 | while (1) |
| 702 | { |
| 703 | csum = 0; |
| 704 | |
| 705 | while (1) |
| 706 | { |
| 707 | c = readchar (); |
| 708 | if (c == '$') |
| 709 | break; |
| 710 | if (remote_debug) |
| 711 | { |
| 712 | fprintf (stderr, "[getpkt: discarding char '%c']\n", c); |
| 713 | fflush (stderr); |
| 714 | } |
| 715 | |
| 716 | if (c < 0) |
| 717 | return -1; |
| 718 | } |
| 719 | |
| 720 | bp = buf; |
| 721 | while (1) |
| 722 | { |
| 723 | c = readchar (); |
| 724 | if (c < 0) |
| 725 | return -1; |
| 726 | if (c == '#') |
| 727 | break; |
| 728 | *bp++ = c; |
| 729 | csum += c; |
| 730 | } |
| 731 | *bp = 0; |
| 732 | |
| 733 | c1 = fromhex (readchar ()); |
| 734 | c2 = fromhex (readchar ()); |
| 735 | |
| 736 | if (csum == (c1 << 4) + c2) |
| 737 | break; |
| 738 | |
| 739 | fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", |
| 740 | (c1 << 4) + c2, csum, buf); |
| 741 | write (remote_desc, "-", 1); |
| 742 | } |
| 743 | |
| 744 | if (remote_debug) |
| 745 | { |
| 746 | fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf); |
| 747 | fflush (stderr); |
| 748 | } |
| 749 | |
| 750 | write (remote_desc, "+", 1); |
| 751 | |
| 752 | if (remote_debug) |
| 753 | { |
| 754 | fprintf (stderr, "[sent ack]\n"); |
| 755 | fflush (stderr); |
| 756 | } |
| 757 | |
| 758 | return bp - buf; |
| 759 | } |
| 760 | |
| 761 | void |
| 762 | write_ok (char *buf) |
| 763 | { |
| 764 | buf[0] = 'O'; |
| 765 | buf[1] = 'K'; |
| 766 | buf[2] = '\0'; |
| 767 | } |
| 768 | |
| 769 | void |
| 770 | write_enn (char *buf) |
| 771 | { |
| 772 | /* Some day, we should define the meanings of the error codes... */ |
| 773 | buf[0] = 'E'; |
| 774 | buf[1] = '0'; |
| 775 | buf[2] = '1'; |
| 776 | buf[3] = '\0'; |
| 777 | } |
| 778 | |
| 779 | void |
| 780 | convert_int_to_ascii (unsigned char *from, char *to, int n) |
| 781 | { |
| 782 | int nib; |
| 783 | int ch; |
| 784 | while (n--) |
| 785 | { |
| 786 | ch = *from++; |
| 787 | nib = ((ch & 0xf0) >> 4) & 0x0f; |
| 788 | *to++ = tohex (nib); |
| 789 | nib = ch & 0x0f; |
| 790 | *to++ = tohex (nib); |
| 791 | } |
| 792 | *to++ = 0; |
| 793 | } |
| 794 | |
| 795 | |
| 796 | void |
| 797 | convert_ascii_to_int (char *from, unsigned char *to, int n) |
| 798 | { |
| 799 | int nib1, nib2; |
| 800 | while (n--) |
| 801 | { |
| 802 | nib1 = fromhex (*from++); |
| 803 | nib2 = fromhex (*from++); |
| 804 | *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f); |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | static char * |
| 809 | outreg (int regno, char *buf) |
| 810 | { |
| 811 | if ((regno >> 12) != 0) |
| 812 | *buf++ = tohex ((regno >> 12) & 0xf); |
| 813 | if ((regno >> 8) != 0) |
| 814 | *buf++ = tohex ((regno >> 8) & 0xf); |
| 815 | *buf++ = tohex ((regno >> 4) & 0xf); |
| 816 | *buf++ = tohex (regno & 0xf); |
| 817 | *buf++ = ':'; |
| 818 | collect_register_as_string (regno, buf); |
| 819 | buf += 2 * register_size (regno); |
| 820 | *buf++ = ';'; |
| 821 | |
| 822 | return buf; |
| 823 | } |
| 824 | |
| 825 | void |
| 826 | new_thread_notify (int id) |
| 827 | { |
| 828 | char own_buf[256]; |
| 829 | |
| 830 | /* The `n' response is not yet part of the remote protocol. Do nothing. */ |
| 831 | if (1) |
| 832 | return; |
| 833 | |
| 834 | if (server_waiting == 0) |
| 835 | return; |
| 836 | |
| 837 | sprintf (own_buf, "n%x", id); |
| 838 | disable_async_io (); |
| 839 | putpkt (own_buf); |
| 840 | enable_async_io (); |
| 841 | } |
| 842 | |
| 843 | void |
| 844 | dead_thread_notify (int id) |
| 845 | { |
| 846 | char own_buf[256]; |
| 847 | |
| 848 | /* The `x' response is not yet part of the remote protocol. Do nothing. */ |
| 849 | if (1) |
| 850 | return; |
| 851 | |
| 852 | sprintf (own_buf, "x%x", id); |
| 853 | disable_async_io (); |
| 854 | putpkt (own_buf); |
| 855 | enable_async_io (); |
| 856 | } |
| 857 | |
| 858 | void |
| 859 | prepare_resume_reply (char *buf, char status, unsigned char sig) |
| 860 | { |
| 861 | int nib; |
| 862 | |
| 863 | *buf++ = status; |
| 864 | |
| 865 | nib = ((sig & 0xf0) >> 4); |
| 866 | *buf++ = tohex (nib); |
| 867 | nib = sig & 0x0f; |
| 868 | *buf++ = tohex (nib); |
| 869 | |
| 870 | if (status == 'T') |
| 871 | { |
| 872 | const char **regp = gdbserver_expedite_regs; |
| 873 | |
| 874 | if (the_target->stopped_by_watchpoint != NULL |
| 875 | && (*the_target->stopped_by_watchpoint) ()) |
| 876 | { |
| 877 | CORE_ADDR addr; |
| 878 | int i; |
| 879 | |
| 880 | strncpy (buf, "watch:", 6); |
| 881 | buf += 6; |
| 882 | |
| 883 | addr = (*the_target->stopped_data_address) (); |
| 884 | |
| 885 | /* Convert each byte of the address into two hexadecimal chars. |
| 886 | Note that we take sizeof (void *) instead of sizeof (addr); |
| 887 | this is to avoid sending a 64-bit address to a 32-bit GDB. */ |
| 888 | for (i = sizeof (void *) * 2; i > 0; i--) |
| 889 | { |
| 890 | *buf++ = tohex ((addr >> (i - 1) * 4) & 0xf); |
| 891 | } |
| 892 | *buf++ = ';'; |
| 893 | } |
| 894 | |
| 895 | while (*regp) |
| 896 | { |
| 897 | buf = outreg (find_regno (*regp), buf); |
| 898 | regp ++; |
| 899 | } |
| 900 | |
| 901 | /* Formerly, if the debugger had not used any thread features we would not |
| 902 | burden it with a thread status response. This was for the benefit of |
| 903 | GDB 4.13 and older. However, in recent GDB versions the check |
| 904 | (``if (cont_thread != 0)'') does not have the desired effect because of |
| 905 | sillyness in the way that the remote protocol handles specifying a thread. |
| 906 | Since thread support relies on qSymbol support anyway, assume GDB can handle |
| 907 | threads. */ |
| 908 | |
| 909 | if (using_threads) |
| 910 | { |
| 911 | unsigned int gdb_id_from_wait; |
| 912 | |
| 913 | /* FIXME right place to set this? */ |
| 914 | thread_from_wait = ((struct inferior_list_entry *)current_inferior)->id; |
| 915 | gdb_id_from_wait = thread_to_gdb_id (current_inferior); |
| 916 | |
| 917 | if (debug_threads) |
| 918 | fprintf (stderr, "Writing resume reply for %ld\n\n", thread_from_wait); |
| 919 | /* This if (1) ought to be unnecessary. But remote_wait in GDB |
| 920 | will claim this event belongs to inferior_ptid if we do not |
| 921 | specify a thread, and there's no way for gdbserver to know |
| 922 | what inferior_ptid is. */ |
| 923 | if (1 || old_thread_from_wait != thread_from_wait) |
| 924 | { |
| 925 | general_thread = thread_from_wait; |
| 926 | sprintf (buf, "thread:%x;", gdb_id_from_wait); |
| 927 | buf += strlen (buf); |
| 928 | old_thread_from_wait = thread_from_wait; |
| 929 | } |
| 930 | } |
| 931 | } |
| 932 | /* For W and X, we're done. */ |
| 933 | *buf++ = 0; |
| 934 | } |
| 935 | |
| 936 | void |
| 937 | decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr) |
| 938 | { |
| 939 | int i = 0, j = 0; |
| 940 | char ch; |
| 941 | *mem_addr_ptr = *len_ptr = 0; |
| 942 | |
| 943 | while ((ch = from[i++]) != ',') |
| 944 | { |
| 945 | *mem_addr_ptr = *mem_addr_ptr << 4; |
| 946 | *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| 947 | } |
| 948 | |
| 949 | for (j = 0; j < 4; j++) |
| 950 | { |
| 951 | if ((ch = from[i++]) == 0) |
| 952 | break; |
| 953 | *len_ptr = *len_ptr << 4; |
| 954 | *len_ptr |= fromhex (ch) & 0x0f; |
| 955 | } |
| 956 | } |
| 957 | |
| 958 | void |
| 959 | decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr, |
| 960 | unsigned char *to) |
| 961 | { |
| 962 | int i = 0; |
| 963 | char ch; |
| 964 | *mem_addr_ptr = *len_ptr = 0; |
| 965 | |
| 966 | while ((ch = from[i++]) != ',') |
| 967 | { |
| 968 | *mem_addr_ptr = *mem_addr_ptr << 4; |
| 969 | *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| 970 | } |
| 971 | |
| 972 | while ((ch = from[i++]) != ':') |
| 973 | { |
| 974 | *len_ptr = *len_ptr << 4; |
| 975 | *len_ptr |= fromhex (ch) & 0x0f; |
| 976 | } |
| 977 | |
| 978 | convert_ascii_to_int (&from[i++], to, *len_ptr); |
| 979 | } |
| 980 | |
| 981 | int |
| 982 | decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr, |
| 983 | unsigned int *len_ptr, unsigned char *to) |
| 984 | { |
| 985 | int i = 0; |
| 986 | char ch; |
| 987 | *mem_addr_ptr = *len_ptr = 0; |
| 988 | |
| 989 | while ((ch = from[i++]) != ',') |
| 990 | { |
| 991 | *mem_addr_ptr = *mem_addr_ptr << 4; |
| 992 | *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| 993 | } |
| 994 | |
| 995 | while ((ch = from[i++]) != ':') |
| 996 | { |
| 997 | *len_ptr = *len_ptr << 4; |
| 998 | *len_ptr |= fromhex (ch) & 0x0f; |
| 999 | } |
| 1000 | |
| 1001 | if (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i, |
| 1002 | to, *len_ptr) != *len_ptr) |
| 1003 | return -1; |
| 1004 | |
| 1005 | return 0; |
| 1006 | } |
| 1007 | |
| 1008 | /* Ask GDB for the address of NAME, and return it in ADDRP if found. |
| 1009 | Returns 1 if the symbol is found, 0 if it is not, -1 on error. */ |
| 1010 | |
| 1011 | int |
| 1012 | look_up_one_symbol (const char *name, CORE_ADDR *addrp) |
| 1013 | { |
| 1014 | char own_buf[266], *p, *q; |
| 1015 | int len; |
| 1016 | struct sym_cache *sym; |
| 1017 | |
| 1018 | /* Check the cache first. */ |
| 1019 | for (sym = symbol_cache; sym; sym = sym->next) |
| 1020 | if (strcmp (name, sym->name) == 0) |
| 1021 | { |
| 1022 | *addrp = sym->addr; |
| 1023 | return 1; |
| 1024 | } |
| 1025 | |
| 1026 | /* If we've passed the call to thread_db_look_up_symbols, then |
| 1027 | anything not in the cache must not exist; we're not interested |
| 1028 | in any libraries loaded after that point, only in symbols in |
| 1029 | libpthread.so. It might not be an appropriate time to look |
| 1030 | up a symbol, e.g. while we're trying to fetch registers. */ |
| 1031 | if (all_symbols_looked_up) |
| 1032 | return 0; |
| 1033 | |
| 1034 | /* Send the request. */ |
| 1035 | strcpy (own_buf, "qSymbol:"); |
| 1036 | hexify (own_buf + strlen ("qSymbol:"), name, strlen (name)); |
| 1037 | if (putpkt (own_buf) < 0) |
| 1038 | return -1; |
| 1039 | |
| 1040 | /* FIXME: Eventually add buffer overflow checking (to getpkt?) */ |
| 1041 | len = getpkt (own_buf); |
| 1042 | if (len < 0) |
| 1043 | return -1; |
| 1044 | |
| 1045 | if (strncmp (own_buf, "qSymbol:", strlen ("qSymbol:")) != 0) |
| 1046 | { |
| 1047 | /* Malformed response. */ |
| 1048 | if (remote_debug) |
| 1049 | { |
| 1050 | fprintf (stderr, "Malformed response to qSymbol, ignoring.\n"); |
| 1051 | fflush (stderr); |
| 1052 | } |
| 1053 | |
| 1054 | return -1; |
| 1055 | } |
| 1056 | |
| 1057 | p = own_buf + strlen ("qSymbol:"); |
| 1058 | q = p; |
| 1059 | while (*q && *q != ':') |
| 1060 | q++; |
| 1061 | |
| 1062 | /* Make sure we found a value for the symbol. */ |
| 1063 | if (p == q || *q == '\0') |
| 1064 | return 0; |
| 1065 | |
| 1066 | decode_address (addrp, p, q - p); |
| 1067 | |
| 1068 | /* Save the symbol in our cache. */ |
| 1069 | sym = malloc (sizeof (*sym)); |
| 1070 | sym->name = strdup (name); |
| 1071 | sym->addr = *addrp; |
| 1072 | sym->next = symbol_cache; |
| 1073 | symbol_cache = sym; |
| 1074 | |
| 1075 | return 1; |
| 1076 | } |
| 1077 | |
| 1078 | void |
| 1079 | monitor_output (char *msg) |
| 1080 | { |
| 1081 | char *buf = malloc (strlen (msg) * 2 + 2); |
| 1082 | |
| 1083 | buf[0] = 'O'; |
| 1084 | hexify (buf + 1, msg, 0); |
| 1085 | |
| 1086 | putpkt (buf); |
| 1087 | free (buf); |
| 1088 | } |