| 1 | /* Main code for remote server for GDB. |
| 2 | Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002 |
| 3 | 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., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | |
| 24 | #include <unistd.h> |
| 25 | #include <signal.h> |
| 26 | #include <sys/wait.h> |
| 27 | |
| 28 | int cont_thread; |
| 29 | int general_thread; |
| 30 | int step_thread; |
| 31 | int thread_from_wait; |
| 32 | int old_thread_from_wait; |
| 33 | int extended_protocol; |
| 34 | int server_waiting; |
| 35 | |
| 36 | jmp_buf toplevel; |
| 37 | |
| 38 | /* The PID of the originally created or attached inferior. Used to |
| 39 | send signals to the process when GDB sends us an asynchronous interrupt |
| 40 | (user hitting Control-C in the client), and to wait for the child to exit |
| 41 | when no longer debugging it. */ |
| 42 | |
| 43 | int signal_pid; |
| 44 | |
| 45 | static unsigned char |
| 46 | start_inferior (char *argv[], char *statusptr) |
| 47 | { |
| 48 | signal (SIGTTOU, SIG_DFL); |
| 49 | signal (SIGTTIN, SIG_DFL); |
| 50 | |
| 51 | signal_pid = create_inferior (argv[0], argv); |
| 52 | |
| 53 | fprintf (stderr, "Process %s created; pid = %d\n", argv[0], |
| 54 | signal_pid); |
| 55 | |
| 56 | signal (SIGTTOU, SIG_IGN); |
| 57 | signal (SIGTTIN, SIG_IGN); |
| 58 | tcsetpgrp (fileno (stderr), signal_pid); |
| 59 | |
| 60 | /* Wait till we are at 1st instruction in program, return signal number. */ |
| 61 | return mywait (statusptr, 0); |
| 62 | } |
| 63 | |
| 64 | static int |
| 65 | attach_inferior (int pid, char *statusptr, unsigned char *sigptr) |
| 66 | { |
| 67 | /* myattach should return -1 if attaching is unsupported, |
| 68 | 0 if it succeeded, and call error() otherwise. */ |
| 69 | |
| 70 | if (myattach (pid) != 0) |
| 71 | return -1; |
| 72 | |
| 73 | /* FIXME - It may be that we should get the SIGNAL_PID from the |
| 74 | attach function, so that it can be the main thread instead of |
| 75 | whichever we were told to attach to. */ |
| 76 | signal_pid = pid; |
| 77 | |
| 78 | *sigptr = mywait (statusptr, 0); |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | extern int remote_debug; |
| 84 | |
| 85 | /* Handle all of the extended 'q' packets. */ |
| 86 | void |
| 87 | handle_query (char *own_buf) |
| 88 | { |
| 89 | static struct inferior_list_entry *thread_ptr; |
| 90 | |
| 91 | if (strcmp ("qSymbol::", own_buf) == 0) |
| 92 | { |
| 93 | if (the_target->look_up_symbols != NULL) |
| 94 | (*the_target->look_up_symbols) (); |
| 95 | |
| 96 | strcpy (own_buf, "OK"); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | if (strcmp ("qfThreadInfo", own_buf) == 0) |
| 101 | { |
| 102 | thread_ptr = all_threads.head; |
| 103 | sprintf (own_buf, "m%x", thread_ptr->id); |
| 104 | thread_ptr = thread_ptr->next; |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | if (strcmp ("qsThreadInfo", own_buf) == 0) |
| 109 | { |
| 110 | if (thread_ptr != NULL) |
| 111 | { |
| 112 | sprintf (own_buf, "m%x", thread_ptr->id); |
| 113 | thread_ptr = thread_ptr->next; |
| 114 | return; |
| 115 | } |
| 116 | else |
| 117 | { |
| 118 | sprintf (own_buf, "l"); |
| 119 | return; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* Otherwise we didn't know what packet it was. Say we didn't |
| 124 | understand it. */ |
| 125 | own_buf[0] = 0; |
| 126 | } |
| 127 | |
| 128 | static int attached; |
| 129 | |
| 130 | static void |
| 131 | gdbserver_usage (void) |
| 132 | { |
| 133 | error ("Usage:\tgdbserver COMM PROG [ARGS ...]\n" |
| 134 | "\tgdbserver COMM --attach PID\n" |
| 135 | "\n" |
| 136 | "COMM may either be a tty device (for serial debugging), or \n" |
| 137 | "HOST:PORT to listen for a TCP connection.\n"); |
| 138 | } |
| 139 | |
| 140 | int |
| 141 | main (int argc, char *argv[]) |
| 142 | { |
| 143 | char ch, status, *own_buf, mem_buf[2000]; |
| 144 | int i = 0; |
| 145 | unsigned char signal; |
| 146 | unsigned int len; |
| 147 | CORE_ADDR mem_addr; |
| 148 | int bad_attach; |
| 149 | int pid; |
| 150 | char *arg_end; |
| 151 | |
| 152 | if (setjmp (toplevel)) |
| 153 | { |
| 154 | fprintf (stderr, "Exiting\n"); |
| 155 | exit (1); |
| 156 | } |
| 157 | |
| 158 | bad_attach = 0; |
| 159 | pid = 0; |
| 160 | attached = 0; |
| 161 | if (argc >= 3 && strcmp (argv[2], "--attach") == 0) |
| 162 | { |
| 163 | if (argc == 4 |
| 164 | && argv[3] != '\0' |
| 165 | && (pid = strtoul (argv[3], &arg_end, 10)) != 0 |
| 166 | && *arg_end == '\0') |
| 167 | { |
| 168 | ; |
| 169 | } |
| 170 | else |
| 171 | bad_attach = 1; |
| 172 | } |
| 173 | |
| 174 | if (argc < 3 || bad_attach) |
| 175 | gdbserver_usage(); |
| 176 | |
| 177 | initialize_low (); |
| 178 | |
| 179 | own_buf = malloc (PBUFSIZ); |
| 180 | |
| 181 | if (pid == 0) |
| 182 | { |
| 183 | /* Wait till we are at first instruction in program. */ |
| 184 | signal = start_inferior (&argv[2], &status); |
| 185 | |
| 186 | /* We are now stopped at the first instruction of the target process */ |
| 187 | } |
| 188 | else |
| 189 | { |
| 190 | switch (attach_inferior (pid, &status, &signal)) |
| 191 | { |
| 192 | case -1: |
| 193 | error ("Attaching not supported on this target"); |
| 194 | break; |
| 195 | default: |
| 196 | attached = 1; |
| 197 | break; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | while (1) |
| 202 | { |
| 203 | remote_open (argv[1]); |
| 204 | |
| 205 | restart: |
| 206 | setjmp (toplevel); |
| 207 | while (getpkt (own_buf) > 0) |
| 208 | { |
| 209 | unsigned char sig; |
| 210 | i = 0; |
| 211 | ch = own_buf[i++]; |
| 212 | switch (ch) |
| 213 | { |
| 214 | case 'q': |
| 215 | handle_query (own_buf); |
| 216 | break; |
| 217 | case 'd': |
| 218 | remote_debug = !remote_debug; |
| 219 | break; |
| 220 | case 'D': |
| 221 | fprintf (stderr, "Detaching from inferior\n"); |
| 222 | detach_inferior (); |
| 223 | write_ok (own_buf); |
| 224 | putpkt (own_buf); |
| 225 | remote_close (); |
| 226 | |
| 227 | /* If we are attached, then we can exit. Otherwise, we need to |
| 228 | hang around doing nothing, until the child is gone. */ |
| 229 | if (!attached) |
| 230 | { |
| 231 | int status, ret; |
| 232 | |
| 233 | do { |
| 234 | ret = waitpid (signal_pid, &status, 0); |
| 235 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
| 236 | break; |
| 237 | } while (ret != -1 || errno != ECHILD); |
| 238 | } |
| 239 | |
| 240 | exit (0); |
| 241 | |
| 242 | case '!': |
| 243 | if (attached == 0) |
| 244 | { |
| 245 | extended_protocol = 1; |
| 246 | prepare_resume_reply (own_buf, status, signal); |
| 247 | } |
| 248 | else |
| 249 | { |
| 250 | /* We can not use the extended protocol if we are |
| 251 | attached, because we can not restart the running |
| 252 | program. So return unrecognized. */ |
| 253 | own_buf[0] = '\0'; |
| 254 | } |
| 255 | break; |
| 256 | case '?': |
| 257 | prepare_resume_reply (own_buf, status, signal); |
| 258 | break; |
| 259 | case 'H': |
| 260 | switch (own_buf[1]) |
| 261 | { |
| 262 | case 'g': |
| 263 | general_thread = strtol (&own_buf[2], NULL, 16); |
| 264 | write_ok (own_buf); |
| 265 | set_desired_inferior (1); |
| 266 | break; |
| 267 | case 'c': |
| 268 | cont_thread = strtol (&own_buf[2], NULL, 16); |
| 269 | write_ok (own_buf); |
| 270 | break; |
| 271 | case 's': |
| 272 | step_thread = strtol (&own_buf[2], NULL, 16); |
| 273 | write_ok (own_buf); |
| 274 | break; |
| 275 | default: |
| 276 | /* Silently ignore it so that gdb can extend the protocol |
| 277 | without compatibility headaches. */ |
| 278 | own_buf[0] = '\0'; |
| 279 | break; |
| 280 | } |
| 281 | break; |
| 282 | case 'g': |
| 283 | set_desired_inferior (1); |
| 284 | registers_to_string (own_buf); |
| 285 | break; |
| 286 | case 'G': |
| 287 | set_desired_inferior (1); |
| 288 | registers_from_string (&own_buf[1]); |
| 289 | write_ok (own_buf); |
| 290 | break; |
| 291 | case 'm': |
| 292 | decode_m_packet (&own_buf[1], &mem_addr, &len); |
| 293 | read_inferior_memory (mem_addr, mem_buf, len); |
| 294 | convert_int_to_ascii (mem_buf, own_buf, len); |
| 295 | break; |
| 296 | case 'M': |
| 297 | decode_M_packet (&own_buf[1], &mem_addr, &len, mem_buf); |
| 298 | if (write_inferior_memory (mem_addr, mem_buf, len) == 0) |
| 299 | write_ok (own_buf); |
| 300 | else |
| 301 | write_enn (own_buf); |
| 302 | break; |
| 303 | case 'C': |
| 304 | convert_ascii_to_int (own_buf + 1, &sig, 1); |
| 305 | if (target_signal_to_host_p (sig)) |
| 306 | signal = target_signal_to_host (sig); |
| 307 | else |
| 308 | signal = 0; |
| 309 | set_desired_inferior (0); |
| 310 | myresume (0, signal); |
| 311 | signal = mywait (&status, 1); |
| 312 | prepare_resume_reply (own_buf, status, signal); |
| 313 | break; |
| 314 | case 'S': |
| 315 | convert_ascii_to_int (own_buf + 1, &sig, 1); |
| 316 | if (target_signal_to_host_p (sig)) |
| 317 | signal = target_signal_to_host (sig); |
| 318 | else |
| 319 | signal = 0; |
| 320 | set_desired_inferior (0); |
| 321 | myresume (1, signal); |
| 322 | signal = mywait (&status, 1); |
| 323 | prepare_resume_reply (own_buf, status, signal); |
| 324 | break; |
| 325 | case 'c': |
| 326 | set_desired_inferior (0); |
| 327 | myresume (0, 0); |
| 328 | signal = mywait (&status, 1); |
| 329 | prepare_resume_reply (own_buf, status, signal); |
| 330 | break; |
| 331 | case 's': |
| 332 | set_desired_inferior (0); |
| 333 | myresume (1, 0); |
| 334 | signal = mywait (&status, 1); |
| 335 | prepare_resume_reply (own_buf, status, signal); |
| 336 | break; |
| 337 | case 'k': |
| 338 | fprintf (stderr, "Killing inferior\n"); |
| 339 | kill_inferior (); |
| 340 | /* When using the extended protocol, we start up a new |
| 341 | debugging session. The traditional protocol will |
| 342 | exit instead. */ |
| 343 | if (extended_protocol) |
| 344 | { |
| 345 | write_ok (own_buf); |
| 346 | fprintf (stderr, "GDBserver restarting\n"); |
| 347 | |
| 348 | /* Wait till we are at 1st instruction in prog. */ |
| 349 | signal = start_inferior (&argv[2], &status); |
| 350 | goto restart; |
| 351 | break; |
| 352 | } |
| 353 | else |
| 354 | { |
| 355 | exit (0); |
| 356 | break; |
| 357 | } |
| 358 | case 'T': |
| 359 | if (mythread_alive (strtol (&own_buf[1], NULL, 16))) |
| 360 | write_ok (own_buf); |
| 361 | else |
| 362 | write_enn (own_buf); |
| 363 | break; |
| 364 | case 'R': |
| 365 | /* Restarting the inferior is only supported in the |
| 366 | extended protocol. */ |
| 367 | if (extended_protocol) |
| 368 | { |
| 369 | kill_inferior (); |
| 370 | write_ok (own_buf); |
| 371 | fprintf (stderr, "GDBserver restarting\n"); |
| 372 | |
| 373 | /* Wait till we are at 1st instruction in prog. */ |
| 374 | signal = start_inferior (&argv[2], &status); |
| 375 | goto restart; |
| 376 | break; |
| 377 | } |
| 378 | else |
| 379 | { |
| 380 | /* It is a request we don't understand. Respond with an |
| 381 | empty packet so that gdb knows that we don't support this |
| 382 | request. */ |
| 383 | own_buf[0] = '\0'; |
| 384 | break; |
| 385 | } |
| 386 | default: |
| 387 | /* It is a request we don't understand. Respond with an |
| 388 | empty packet so that gdb knows that we don't support this |
| 389 | request. */ |
| 390 | own_buf[0] = '\0'; |
| 391 | break; |
| 392 | } |
| 393 | |
| 394 | putpkt (own_buf); |
| 395 | |
| 396 | if (status == 'W') |
| 397 | fprintf (stderr, |
| 398 | "\nChild exited with status %d\n", sig); |
| 399 | if (status == 'X') |
| 400 | fprintf (stderr, "\nChild terminated with signal = 0x%x\n", sig); |
| 401 | if (status == 'W' || status == 'X') |
| 402 | { |
| 403 | if (extended_protocol) |
| 404 | { |
| 405 | fprintf (stderr, "Killing inferior\n"); |
| 406 | kill_inferior (); |
| 407 | write_ok (own_buf); |
| 408 | fprintf (stderr, "GDBserver restarting\n"); |
| 409 | |
| 410 | /* Wait till we are at 1st instruction in prog. */ |
| 411 | signal = start_inferior (&argv[2], &status); |
| 412 | goto restart; |
| 413 | break; |
| 414 | } |
| 415 | else |
| 416 | { |
| 417 | fprintf (stderr, "GDBserver exiting\n"); |
| 418 | exit (0); |
| 419 | } |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | /* We come here when getpkt fails. |
| 424 | |
| 425 | For the extended remote protocol we exit (and this is the only |
| 426 | way we gracefully exit!). |
| 427 | |
| 428 | For the traditional remote protocol close the connection, |
| 429 | and re-open it at the top of the loop. */ |
| 430 | if (extended_protocol) |
| 431 | { |
| 432 | remote_close (); |
| 433 | exit (0); |
| 434 | } |
| 435 | else |
| 436 | { |
| 437 | fprintf (stderr, "Remote side has terminated connection. " |
| 438 | "GDBserver will reopen the connection.\n"); |
| 439 | remote_close (); |
| 440 | } |
| 441 | } |
| 442 | } |