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c906108c | 1 | /* Remote utility routines for the remote server for GDB. |
6f0f660e | 2 | Copyright (C) 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
ea025f5f | 3 | 2002, 2003, 2004, 2005, 2006 |
b6ba6518 | 4 | Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
22 | |
23 | #include "server.h" | |
b80864fb | 24 | #if HAVE_TERMINAL_H |
c906108c | 25 | #include "terminal.h" |
b80864fb | 26 | #endif |
c906108c SS |
27 | #include <stdio.h> |
28 | #include <string.h> | |
b80864fb | 29 | #if HAVE_SYS_IOCTL_H |
c906108c | 30 | #include <sys/ioctl.h> |
b80864fb | 31 | #endif |
c906108c | 32 | #include <sys/file.h> |
b80864fb | 33 | #if HAVE_NETINET_IN_H |
c906108c | 34 | #include <netinet/in.h> |
b80864fb DJ |
35 | #endif |
36 | #if HAVE_SYS_SOCKET_H | |
c906108c | 37 | #include <sys/socket.h> |
b80864fb DJ |
38 | #endif |
39 | #if HAVE_NETDB_H | |
c906108c | 40 | #include <netdb.h> |
b80864fb DJ |
41 | #endif |
42 | #if HAVE_NETINET_TCP_H | |
c906108c | 43 | #include <netinet/tcp.h> |
b80864fb DJ |
44 | #endif |
45 | #if HAVE_SYS_IOCTL_H | |
c906108c | 46 | #include <sys/ioctl.h> |
b80864fb | 47 | #endif |
c906108c SS |
48 | #include <signal.h> |
49 | #include <fcntl.h> | |
cf30a8e1 C |
50 | #include <sys/time.h> |
51 | #include <unistd.h> | |
b80864fb | 52 | #if HAVE_ARPA_INET_H |
0729219d | 53 | #include <arpa/inet.h> |
b80864fb DJ |
54 | #endif |
55 | ||
56 | #if USE_WIN32API | |
57 | #include <winsock.h> | |
58 | #endif | |
c906108c | 59 | |
f450004a DJ |
60 | #ifndef HAVE_SOCKLEN_T |
61 | typedef int socklen_t; | |
62 | #endif | |
63 | ||
fd500816 DJ |
64 | /* A cache entry for a successfully looked-up symbol. */ |
65 | struct sym_cache | |
66 | { | |
67 | const char *name; | |
68 | CORE_ADDR addr; | |
69 | struct sym_cache *next; | |
70 | }; | |
71 | ||
72 | /* The symbol cache. */ | |
73 | static struct sym_cache *symbol_cache; | |
74 | ||
ea025f5f DJ |
75 | /* If this flag has been set, assume cache misses are |
76 | failures. */ | |
77 | int all_symbols_looked_up; | |
78 | ||
c906108c | 79 | int remote_debug = 0; |
03863182 | 80 | struct ui_file *gdb_stdlog; |
c906108c SS |
81 | |
82 | static int remote_desc; | |
83 | ||
0d62e5e8 DJ |
84 | /* FIXME headerize? */ |
85 | extern int using_threads; | |
86 | extern int debug_threads; | |
87 | ||
c906108c SS |
88 | /* Open a connection to a remote debugger. |
89 | NAME is the filename used for communication. */ | |
90 | ||
91 | void | |
fba45db2 | 92 | remote_open (char *name) |
c906108c | 93 | { |
b80864fb | 94 | #if defined(F_SETFL) && defined (FASYNC) |
c906108c | 95 | int save_fcntl_flags; |
b80864fb | 96 | #endif |
e641a1ca | 97 | |
c906108c SS |
98 | if (!strchr (name, ':')) |
99 | { | |
b80864fb DJ |
100 | #ifdef USE_WIN32API |
101 | error ("Only <host>:<port> is supported on this platform."); | |
102 | #else | |
c906108c SS |
103 | remote_desc = open (name, O_RDWR); |
104 | if (remote_desc < 0) | |
105 | perror_with_name ("Could not open remote device"); | |
106 | ||
107 | #ifdef HAVE_TERMIOS | |
108 | { | |
109 | struct termios termios; | |
c5aa993b | 110 | tcgetattr (remote_desc, &termios); |
c906108c SS |
111 | |
112 | termios.c_iflag = 0; | |
113 | termios.c_oflag = 0; | |
114 | termios.c_lflag = 0; | |
c5aa993b | 115 | termios.c_cflag &= ~(CSIZE | PARENB); |
c906108c | 116 | termios.c_cflag |= CLOCAL | CS8; |
d0608e50 | 117 | termios.c_cc[VMIN] = 1; |
c906108c SS |
118 | termios.c_cc[VTIME] = 0; |
119 | ||
c5aa993b | 120 | tcsetattr (remote_desc, TCSANOW, &termios); |
c906108c SS |
121 | } |
122 | #endif | |
123 | ||
124 | #ifdef HAVE_TERMIO | |
125 | { | |
126 | struct termio termio; | |
127 | ioctl (remote_desc, TCGETA, &termio); | |
128 | ||
129 | termio.c_iflag = 0; | |
130 | termio.c_oflag = 0; | |
131 | termio.c_lflag = 0; | |
c5aa993b | 132 | termio.c_cflag &= ~(CSIZE | PARENB); |
c906108c | 133 | termio.c_cflag |= CLOCAL | CS8; |
d0608e50 | 134 | termio.c_cc[VMIN] = 1; |
c906108c SS |
135 | termio.c_cc[VTIME] = 0; |
136 | ||
137 | ioctl (remote_desc, TCSETA, &termio); | |
138 | } | |
139 | #endif | |
140 | ||
141 | #ifdef HAVE_SGTTY | |
142 | { | |
143 | struct sgttyb sg; | |
144 | ||
145 | ioctl (remote_desc, TIOCGETP, &sg); | |
146 | sg.sg_flags = RAW; | |
147 | ioctl (remote_desc, TIOCSETP, &sg); | |
148 | } | |
149 | #endif | |
150 | ||
e641a1ca | 151 | fprintf (stderr, "Remote debugging using %s\n", name); |
b80864fb | 152 | #endif /* USE_WIN32API */ |
c906108c SS |
153 | } |
154 | else | |
155 | { | |
b80864fb DJ |
156 | #ifdef USE_WIN32API |
157 | static int winsock_initialized; | |
158 | #endif | |
c906108c SS |
159 | char *port_str; |
160 | int port; | |
161 | struct sockaddr_in sockaddr; | |
f450004a | 162 | socklen_t tmp; |
c906108c SS |
163 | int tmp_desc; |
164 | ||
165 | port_str = strchr (name, ':'); | |
166 | ||
167 | port = atoi (port_str + 1); | |
168 | ||
b80864fb DJ |
169 | #ifdef USE_WIN32API |
170 | if (!winsock_initialized) | |
171 | { | |
172 | WSADATA wsad; | |
173 | ||
174 | WSAStartup (MAKEWORD (1, 0), &wsad); | |
175 | winsock_initialized = 1; | |
176 | } | |
177 | #endif | |
178 | ||
179 | tmp_desc = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); | |
c906108c SS |
180 | if (tmp_desc < 0) |
181 | perror_with_name ("Can't open socket"); | |
182 | ||
183 | /* Allow rapid reuse of this port. */ | |
184 | tmp = 1; | |
c5aa993b JM |
185 | setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, |
186 | sizeof (tmp)); | |
c906108c SS |
187 | |
188 | sockaddr.sin_family = PF_INET; | |
c5aa993b | 189 | sockaddr.sin_port = htons (port); |
c906108c SS |
190 | sockaddr.sin_addr.s_addr = INADDR_ANY; |
191 | ||
c5aa993b | 192 | if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) |
c906108c SS |
193 | || listen (tmp_desc, 1)) |
194 | perror_with_name ("Can't bind address"); | |
195 | ||
6910d122 | 196 | fprintf (stderr, "Listening on port %d\n", port); |
b80864fb | 197 | fflush (stderr); |
6910d122 | 198 | |
c906108c | 199 | tmp = sizeof (sockaddr); |
c5aa993b | 200 | remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp); |
c906108c SS |
201 | if (remote_desc == -1) |
202 | perror_with_name ("Accept failed"); | |
203 | ||
c906108c SS |
204 | /* Enable TCP keep alive process. */ |
205 | tmp = 1; | |
c5aa993b | 206 | setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp)); |
c906108c SS |
207 | |
208 | /* Tell TCP not to delay small packets. This greatly speeds up | |
c5aa993b | 209 | interactive response. */ |
c906108c | 210 | tmp = 1; |
373fe97f | 211 | setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY, |
c5aa993b | 212 | (char *) &tmp, sizeof (tmp)); |
c906108c | 213 | |
b80864fb DJ |
214 | |
215 | #ifndef USE_WIN32API | |
c906108c SS |
216 | close (tmp_desc); /* No longer need this */ |
217 | ||
c5aa993b JM |
218 | signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply |
219 | exits when the remote side dies. */ | |
b80864fb DJ |
220 | #else |
221 | closesocket (tmp_desc); /* No longer need this */ | |
222 | #endif | |
e641a1ca ML |
223 | |
224 | /* Convert IP address to string. */ | |
225 | fprintf (stderr, "Remote debugging from host %s\n", | |
226 | inet_ntoa (sockaddr.sin_addr)); | |
c906108c SS |
227 | } |
228 | ||
229 | #if defined(F_SETFL) && defined (FASYNC) | |
230 | save_fcntl_flags = fcntl (remote_desc, F_GETFL, 0); | |
231 | fcntl (remote_desc, F_SETFL, save_fcntl_flags | FASYNC); | |
cf30a8e1 C |
232 | #if defined (F_SETOWN) |
233 | fcntl (remote_desc, F_SETOWN, getpid ()); | |
94dfea5d | 234 | #endif |
cf30a8e1 | 235 | #endif |
c906108c | 236 | disable_async_io (); |
c906108c SS |
237 | } |
238 | ||
239 | void | |
fba45db2 | 240 | remote_close (void) |
c906108c | 241 | { |
b80864fb DJ |
242 | #ifdef USE_WIN32API |
243 | closesocket (remote_desc); | |
244 | #else | |
c906108c | 245 | close (remote_desc); |
b80864fb | 246 | #endif |
c906108c SS |
247 | } |
248 | ||
249 | /* Convert hex digit A to a number. */ | |
250 | ||
251 | static int | |
fba45db2 | 252 | fromhex (int a) |
c906108c SS |
253 | { |
254 | if (a >= '0' && a <= '9') | |
255 | return a - '0'; | |
256 | else if (a >= 'a' && a <= 'f') | |
257 | return a - 'a' + 10; | |
258 | else | |
259 | error ("Reply contains invalid hex digit"); | |
0a30fbc4 | 260 | return 0; |
c906108c SS |
261 | } |
262 | ||
ce3a066d DJ |
263 | int |
264 | unhexify (char *bin, const char *hex, int count) | |
265 | { | |
266 | int i; | |
267 | ||
268 | for (i = 0; i < count; i++) | |
269 | { | |
270 | if (hex[0] == 0 || hex[1] == 0) | |
271 | { | |
272 | /* Hex string is short, or of uneven length. | |
273 | Return the count that has been converted so far. */ | |
274 | return i; | |
275 | } | |
276 | *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]); | |
277 | hex += 2; | |
278 | } | |
279 | return i; | |
280 | } | |
281 | ||
dae5f5cf | 282 | void |
2f2893d9 DJ |
283 | decode_address (CORE_ADDR *addrp, const char *start, int len) |
284 | { | |
285 | CORE_ADDR addr; | |
286 | char ch; | |
287 | int i; | |
288 | ||
289 | addr = 0; | |
290 | for (i = 0; i < len; i++) | |
291 | { | |
292 | ch = start[i]; | |
293 | addr = addr << 4; | |
294 | addr = addr | (fromhex (ch) & 0x0f); | |
295 | } | |
296 | *addrp = addr; | |
297 | } | |
298 | ||
c906108c SS |
299 | /* Convert number NIB to a hex digit. */ |
300 | ||
301 | static int | |
fba45db2 | 302 | tohex (int nib) |
c906108c SS |
303 | { |
304 | if (nib < 10) | |
305 | return '0' + nib; | |
306 | else | |
307 | return 'a' + nib - 10; | |
308 | } | |
309 | ||
ce3a066d DJ |
310 | int |
311 | hexify (char *hex, const char *bin, int count) | |
312 | { | |
313 | int i; | |
314 | ||
315 | /* May use a length, or a nul-terminated string as input. */ | |
316 | if (count == 0) | |
317 | count = strlen (bin); | |
318 | ||
319 | for (i = 0; i < count; i++) | |
320 | { | |
321 | *hex++ = tohex ((*bin >> 4) & 0xf); | |
322 | *hex++ = tohex (*bin++ & 0xf); | |
323 | } | |
324 | *hex = 0; | |
325 | return i; | |
326 | } | |
327 | ||
01f9e8fa DJ |
328 | /* Convert BUFFER, binary data at least LEN bytes long, into escaped |
329 | binary data in OUT_BUF. Set *OUT_LEN to the length of the data | |
330 | encoded in OUT_BUF, and return the number of bytes in OUT_BUF | |
331 | (which may be more than *OUT_LEN due to escape characters). The | |
332 | total number of bytes in the output buffer will be at most | |
333 | OUT_MAXLEN. */ | |
334 | ||
335 | int | |
336 | remote_escape_output (const gdb_byte *buffer, int len, | |
337 | gdb_byte *out_buf, int *out_len, | |
338 | int out_maxlen) | |
339 | { | |
340 | int input_index, output_index; | |
341 | ||
342 | output_index = 0; | |
343 | for (input_index = 0; input_index < len; input_index++) | |
344 | { | |
345 | gdb_byte b = buffer[input_index]; | |
346 | ||
347 | if (b == '$' || b == '#' || b == '}' || b == '*') | |
348 | { | |
349 | /* These must be escaped. */ | |
350 | if (output_index + 2 > out_maxlen) | |
351 | break; | |
352 | out_buf[output_index++] = '}'; | |
353 | out_buf[output_index++] = b ^ 0x20; | |
354 | } | |
355 | else | |
356 | { | |
357 | if (output_index + 1 > out_maxlen) | |
358 | break; | |
359 | out_buf[output_index++] = b; | |
360 | } | |
361 | } | |
362 | ||
363 | *out_len = input_index; | |
364 | return output_index; | |
365 | } | |
366 | ||
367 | /* Convert BUFFER, escaped data LEN bytes long, into binary data | |
368 | in OUT_BUF. Return the number of bytes written to OUT_BUF. | |
369 | Raise an error if the total number of bytes exceeds OUT_MAXLEN. | |
370 | ||
371 | This function reverses remote_escape_output. It allows more | |
372 | escaped characters than that function does, in particular because | |
373 | '*' must be escaped to avoid the run-length encoding processing | |
374 | in reading packets. */ | |
375 | ||
376 | static int | |
377 | remote_unescape_input (const gdb_byte *buffer, int len, | |
378 | gdb_byte *out_buf, int out_maxlen) | |
379 | { | |
380 | int input_index, output_index; | |
381 | int escaped; | |
382 | ||
383 | output_index = 0; | |
384 | escaped = 0; | |
385 | for (input_index = 0; input_index < len; input_index++) | |
386 | { | |
387 | gdb_byte b = buffer[input_index]; | |
388 | ||
389 | if (output_index + 1 > out_maxlen) | |
390 | error ("Received too much data from the target."); | |
391 | ||
392 | if (escaped) | |
393 | { | |
394 | out_buf[output_index++] = b ^ 0x20; | |
395 | escaped = 0; | |
396 | } | |
397 | else if (b == '}') | |
398 | escaped = 1; | |
399 | else | |
400 | out_buf[output_index++] = b; | |
401 | } | |
402 | ||
403 | if (escaped) | |
404 | error ("Unmatched escape character in target response."); | |
405 | ||
406 | return output_index; | |
407 | } | |
408 | ||
5ffff7c1 DJ |
409 | /* Look for a sequence of characters which can be run-length encoded. |
410 | If there are any, update *CSUM and *P. Otherwise, output the | |
411 | single character. Return the number of characters consumed. */ | |
412 | ||
413 | static int | |
414 | try_rle (char *buf, int remaining, unsigned char *csum, char **p) | |
415 | { | |
416 | int n; | |
417 | ||
418 | /* Always output the character. */ | |
419 | *csum += buf[0]; | |
420 | *(*p)++ = buf[0]; | |
421 | ||
422 | /* Don't go past '~'. */ | |
423 | if (remaining > 97) | |
424 | remaining = 97; | |
425 | ||
426 | for (n = 1; n < remaining; n++) | |
427 | if (buf[n] != buf[0]) | |
428 | break; | |
429 | ||
430 | /* N is the index of the first character not the same as buf[0]. | |
431 | buf[0] is counted twice, so by decrementing N, we get the number | |
432 | of characters the RLE sequence will replace. */ | |
433 | n--; | |
434 | ||
435 | if (n < 3) | |
436 | return 1; | |
437 | ||
438 | /* Skip the frame characters. The manual says to skip '+' and '-' | |
439 | also, but there's no reason to. Unfortunately these two unusable | |
440 | characters double the encoded length of a four byte zero | |
441 | value. */ | |
442 | while (n + 29 == '$' || n + 29 == '#') | |
443 | n--; | |
444 | ||
445 | *csum += '*'; | |
446 | *(*p)++ = '*'; | |
447 | *csum += n + 29; | |
448 | *(*p)++ = n + 29; | |
449 | ||
450 | return n + 1; | |
451 | } | |
452 | ||
c906108c | 453 | /* Send a packet to the remote machine, with error checking. |
01f9e8fa DJ |
454 | The data of the packet is in BUF, and the length of the |
455 | packet is in CNT. Returns >= 0 on success, -1 otherwise. */ | |
c906108c SS |
456 | |
457 | int | |
01f9e8fa | 458 | putpkt_binary (char *buf, int cnt) |
c906108c SS |
459 | { |
460 | int i; | |
461 | unsigned char csum = 0; | |
0a30fbc4 | 462 | char *buf2; |
c906108c | 463 | char buf3[1]; |
c906108c SS |
464 | char *p; |
465 | ||
0a30fbc4 DJ |
466 | buf2 = malloc (PBUFSIZ); |
467 | ||
c906108c SS |
468 | /* Copy the packet into buffer BUF2, encapsulating it |
469 | and giving it a checksum. */ | |
470 | ||
471 | p = buf2; | |
472 | *p++ = '$'; | |
473 | ||
5ffff7c1 DJ |
474 | for (i = 0; i < cnt;) |
475 | i += try_rle (buf + i, cnt - i, &csum, &p); | |
476 | ||
c906108c SS |
477 | *p++ = '#'; |
478 | *p++ = tohex ((csum >> 4) & 0xf); | |
479 | *p++ = tohex (csum & 0xf); | |
480 | ||
481 | *p = '\0'; | |
482 | ||
483 | /* Send it over and over until we get a positive ack. */ | |
484 | ||
485 | do | |
486 | { | |
487 | int cc; | |
488 | ||
b80864fb | 489 | if (send (remote_desc, buf2, p - buf2, 0) != p - buf2) |
c906108c SS |
490 | { |
491 | perror ("putpkt(write)"); | |
492 | return -1; | |
493 | } | |
494 | ||
495 | if (remote_debug) | |
0d62e5e8 DJ |
496 | { |
497 | fprintf (stderr, "putpkt (\"%s\"); [looking for ack]\n", buf2); | |
498 | fflush (stderr); | |
499 | } | |
b80864fb | 500 | cc = recv (remote_desc, buf3, 1, 0); |
c906108c | 501 | if (remote_debug) |
0d62e5e8 DJ |
502 | { |
503 | fprintf (stderr, "[received '%c' (0x%x)]\n", buf3[0], buf3[0]); | |
504 | fflush (stderr); | |
505 | } | |
506 | ||
c906108c SS |
507 | if (cc <= 0) |
508 | { | |
509 | if (cc == 0) | |
510 | fprintf (stderr, "putpkt(read): Got EOF\n"); | |
511 | else | |
512 | perror ("putpkt(read)"); | |
513 | ||
0a30fbc4 | 514 | free (buf2); |
c906108c SS |
515 | return -1; |
516 | } | |
0d62e5e8 DJ |
517 | |
518 | /* Check for an input interrupt while we're here. */ | |
519 | if (buf3[0] == '\003') | |
e5379b03 | 520 | (*the_target->send_signal) (SIGINT); |
c906108c SS |
521 | } |
522 | while (buf3[0] != '+'); | |
523 | ||
0a30fbc4 | 524 | free (buf2); |
c906108c SS |
525 | return 1; /* Success! */ |
526 | } | |
527 | ||
01f9e8fa DJ |
528 | /* Send a packet to the remote machine, with error checking. The data |
529 | of the packet is in BUF, and the packet should be a NUL-terminated | |
530 | string. Returns >= 0 on success, -1 otherwise. */ | |
531 | ||
532 | int | |
533 | putpkt (char *buf) | |
534 | { | |
535 | return putpkt_binary (buf, strlen (buf)); | |
536 | } | |
537 | ||
b80864fb | 538 | #ifndef USE_WIN32API |
01f9e8fa | 539 | |
c906108c SS |
540 | /* Come here when we get an input interrupt from the remote side. This |
541 | interrupt should only be active while we are waiting for the child to do | |
542 | something. About the only thing that should come through is a ^C, which | |
543 | will cause us to send a SIGINT to the child. */ | |
544 | ||
545 | static void | |
0a30fbc4 | 546 | input_interrupt (int unused) |
c906108c | 547 | { |
cf30a8e1 C |
548 | fd_set readset; |
549 | struct timeval immediate = { 0, 0 }; | |
c906108c | 550 | |
cf30a8e1 C |
551 | /* Protect against spurious interrupts. This has been observed to |
552 | be a problem under NetBSD 1.4 and 1.5. */ | |
c906108c | 553 | |
cf30a8e1 C |
554 | FD_ZERO (&readset); |
555 | FD_SET (remote_desc, &readset); | |
556 | if (select (remote_desc + 1, &readset, 0, 0, &immediate) > 0) | |
c906108c | 557 | { |
cf30a8e1 | 558 | int cc; |
fd500816 | 559 | char c = 0; |
cf30a8e1 | 560 | |
b80864fb | 561 | cc = recv (remote_desc, &c, 1, 0); |
c906108c | 562 | |
cf30a8e1 C |
563 | if (cc != 1 || c != '\003') |
564 | { | |
fd500816 DJ |
565 | fprintf (stderr, "input_interrupt, count = %d c = %d ('%c')\n", |
566 | cc, c, c); | |
cf30a8e1 C |
567 | return; |
568 | } | |
569 | ||
e5379b03 | 570 | (*the_target->send_signal) (SIGINT); |
cf30a8e1 | 571 | } |
c906108c | 572 | } |
b80864fb DJ |
573 | #endif |
574 | ||
575 | /* Asynchronous I/O support. SIGIO must be enabled when waiting, in order to | |
576 | accept Control-C from the client, and must be disabled when talking to | |
577 | the client. */ | |
c906108c | 578 | |
62ea82f5 DJ |
579 | void |
580 | block_async_io (void) | |
581 | { | |
b80864fb | 582 | #ifndef USE_WIN32API |
62ea82f5 DJ |
583 | sigset_t sigio_set; |
584 | sigemptyset (&sigio_set); | |
585 | sigaddset (&sigio_set, SIGIO); | |
586 | sigprocmask (SIG_BLOCK, &sigio_set, NULL); | |
b80864fb | 587 | #endif |
62ea82f5 DJ |
588 | } |
589 | ||
590 | void | |
591 | unblock_async_io (void) | |
592 | { | |
b80864fb | 593 | #ifndef USE_WIN32API |
62ea82f5 DJ |
594 | sigset_t sigio_set; |
595 | sigemptyset (&sigio_set); | |
596 | sigaddset (&sigio_set, SIGIO); | |
597 | sigprocmask (SIG_UNBLOCK, &sigio_set, NULL); | |
b80864fb | 598 | #endif |
62ea82f5 DJ |
599 | } |
600 | ||
fd500816 DJ |
601 | /* Current state of asynchronous I/O. */ |
602 | static int async_io_enabled; | |
603 | ||
604 | /* Enable asynchronous I/O. */ | |
c906108c | 605 | void |
fba45db2 | 606 | enable_async_io (void) |
c906108c | 607 | { |
fd500816 DJ |
608 | if (async_io_enabled) |
609 | return; | |
610 | ||
b80864fb | 611 | #ifndef USE_WIN32API |
c906108c | 612 | signal (SIGIO, input_interrupt); |
b80864fb | 613 | #endif |
fd500816 | 614 | async_io_enabled = 1; |
c906108c SS |
615 | } |
616 | ||
fd500816 | 617 | /* Disable asynchronous I/O. */ |
c906108c | 618 | void |
fba45db2 | 619 | disable_async_io (void) |
c906108c | 620 | { |
fd500816 DJ |
621 | if (!async_io_enabled) |
622 | return; | |
623 | ||
b80864fb | 624 | #ifndef USE_WIN32API |
c906108c | 625 | signal (SIGIO, SIG_IGN); |
b80864fb | 626 | #endif |
fd500816 | 627 | async_io_enabled = 0; |
c906108c SS |
628 | } |
629 | ||
630 | /* Returns next char from remote GDB. -1 if error. */ | |
631 | ||
632 | static int | |
fba45db2 | 633 | readchar (void) |
c906108c | 634 | { |
01f9e8fa | 635 | static unsigned char buf[BUFSIZ]; |
c906108c | 636 | static int bufcnt = 0; |
01f9e8fa | 637 | static unsigned char *bufp; |
c906108c SS |
638 | |
639 | if (bufcnt-- > 0) | |
01f9e8fa | 640 | return *bufp++; |
c906108c | 641 | |
b80864fb | 642 | bufcnt = recv (remote_desc, buf, sizeof (buf), 0); |
c906108c SS |
643 | |
644 | if (bufcnt <= 0) | |
645 | { | |
646 | if (bufcnt == 0) | |
647 | fprintf (stderr, "readchar: Got EOF\n"); | |
648 | else | |
649 | perror ("readchar"); | |
650 | ||
651 | return -1; | |
652 | } | |
653 | ||
654 | bufp = buf; | |
655 | bufcnt--; | |
656 | return *bufp++ & 0x7f; | |
657 | } | |
658 | ||
659 | /* Read a packet from the remote machine, with error checking, | |
660 | and store it in BUF. Returns length of packet, or negative if error. */ | |
661 | ||
662 | int | |
fba45db2 | 663 | getpkt (char *buf) |
c906108c SS |
664 | { |
665 | char *bp; | |
666 | unsigned char csum, c1, c2; | |
667 | int c; | |
668 | ||
669 | while (1) | |
670 | { | |
671 | csum = 0; | |
672 | ||
673 | while (1) | |
674 | { | |
675 | c = readchar (); | |
676 | if (c == '$') | |
677 | break; | |
678 | if (remote_debug) | |
0d62e5e8 DJ |
679 | { |
680 | fprintf (stderr, "[getpkt: discarding char '%c']\n", c); | |
681 | fflush (stderr); | |
682 | } | |
683 | ||
c906108c SS |
684 | if (c < 0) |
685 | return -1; | |
686 | } | |
687 | ||
688 | bp = buf; | |
689 | while (1) | |
690 | { | |
691 | c = readchar (); | |
692 | if (c < 0) | |
693 | return -1; | |
694 | if (c == '#') | |
695 | break; | |
696 | *bp++ = c; | |
697 | csum += c; | |
698 | } | |
699 | *bp = 0; | |
700 | ||
701 | c1 = fromhex (readchar ()); | |
702 | c2 = fromhex (readchar ()); | |
c5aa993b | 703 | |
c906108c SS |
704 | if (csum == (c1 << 4) + c2) |
705 | break; | |
706 | ||
707 | fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", | |
708 | (c1 << 4) + c2, csum, buf); | |
b80864fb | 709 | send (remote_desc, "-", 1, 0); |
c906108c SS |
710 | } |
711 | ||
712 | if (remote_debug) | |
0d62e5e8 DJ |
713 | { |
714 | fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf); | |
715 | fflush (stderr); | |
716 | } | |
c906108c | 717 | |
b80864fb | 718 | send (remote_desc, "+", 1, 0); |
c906108c SS |
719 | |
720 | if (remote_debug) | |
0d62e5e8 DJ |
721 | { |
722 | fprintf (stderr, "[sent ack]\n"); | |
723 | fflush (stderr); | |
724 | } | |
725 | ||
c906108c SS |
726 | return bp - buf; |
727 | } | |
728 | ||
729 | void | |
fba45db2 | 730 | write_ok (char *buf) |
c906108c SS |
731 | { |
732 | buf[0] = 'O'; | |
733 | buf[1] = 'K'; | |
734 | buf[2] = '\0'; | |
735 | } | |
736 | ||
737 | void | |
fba45db2 | 738 | write_enn (char *buf) |
c906108c | 739 | { |
c89dc5d4 | 740 | /* Some day, we should define the meanings of the error codes... */ |
c906108c | 741 | buf[0] = 'E'; |
c89dc5d4 DJ |
742 | buf[1] = '0'; |
743 | buf[2] = '1'; | |
c906108c SS |
744 | buf[3] = '\0'; |
745 | } | |
746 | ||
747 | void | |
f450004a | 748 | convert_int_to_ascii (unsigned char *from, char *to, int n) |
c906108c SS |
749 | { |
750 | int nib; | |
f450004a | 751 | int ch; |
c906108c SS |
752 | while (n--) |
753 | { | |
754 | ch = *from++; | |
755 | nib = ((ch & 0xf0) >> 4) & 0x0f; | |
756 | *to++ = tohex (nib); | |
757 | nib = ch & 0x0f; | |
758 | *to++ = tohex (nib); | |
759 | } | |
760 | *to++ = 0; | |
761 | } | |
762 | ||
763 | ||
764 | void | |
f450004a | 765 | convert_ascii_to_int (char *from, unsigned char *to, int n) |
c906108c SS |
766 | { |
767 | int nib1, nib2; | |
768 | while (n--) | |
769 | { | |
770 | nib1 = fromhex (*from++); | |
771 | nib2 = fromhex (*from++); | |
772 | *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f); | |
773 | } | |
774 | } | |
775 | ||
776 | static char * | |
fba45db2 | 777 | outreg (int regno, char *buf) |
c906108c | 778 | { |
5c44784c JM |
779 | if ((regno >> 12) != 0) |
780 | *buf++ = tohex ((regno >> 12) & 0xf); | |
781 | if ((regno >> 8) != 0) | |
782 | *buf++ = tohex ((regno >> 8) & 0xf); | |
783 | *buf++ = tohex ((regno >> 4) & 0xf); | |
c906108c SS |
784 | *buf++ = tohex (regno & 0xf); |
785 | *buf++ = ':'; | |
0d62e5e8 DJ |
786 | collect_register_as_string (regno, buf); |
787 | buf += 2 * register_size (regno); | |
c906108c SS |
788 | *buf++ = ';'; |
789 | ||
790 | return buf; | |
791 | } | |
792 | ||
0d62e5e8 DJ |
793 | void |
794 | new_thread_notify (int id) | |
795 | { | |
796 | char own_buf[256]; | |
797 | ||
798 | /* The `n' response is not yet part of the remote protocol. Do nothing. */ | |
799 | if (1) | |
800 | return; | |
801 | ||
802 | if (server_waiting == 0) | |
803 | return; | |
804 | ||
805 | sprintf (own_buf, "n%x", id); | |
806 | disable_async_io (); | |
807 | putpkt (own_buf); | |
808 | enable_async_io (); | |
809 | } | |
810 | ||
811 | void | |
812 | dead_thread_notify (int id) | |
813 | { | |
814 | char own_buf[256]; | |
815 | ||
816 | /* The `x' response is not yet part of the remote protocol. Do nothing. */ | |
817 | if (1) | |
818 | return; | |
819 | ||
820 | sprintf (own_buf, "x%x", id); | |
821 | disable_async_io (); | |
822 | putpkt (own_buf); | |
823 | enable_async_io (); | |
824 | } | |
825 | ||
c906108c | 826 | void |
b80864fb | 827 | prepare_resume_reply (char *buf, char status, unsigned char sig) |
c906108c | 828 | { |
b80864fb | 829 | int nib; |
c906108c SS |
830 | |
831 | *buf++ = status; | |
832 | ||
0e98d0a7 | 833 | nib = ((sig & 0xf0) >> 4); |
c906108c | 834 | *buf++ = tohex (nib); |
0e98d0a7 | 835 | nib = sig & 0x0f; |
c906108c SS |
836 | *buf++ = tohex (nib); |
837 | ||
838 | if (status == 'T') | |
839 | { | |
0a30fbc4 | 840 | const char **regp = gdbserver_expedite_regs; |
e013ee27 OF |
841 | |
842 | if (the_target->stopped_by_watchpoint != NULL | |
843 | && (*the_target->stopped_by_watchpoint) ()) | |
844 | { | |
845 | CORE_ADDR addr; | |
846 | int i; | |
847 | ||
848 | strncpy (buf, "watch:", 6); | |
849 | buf += 6; | |
850 | ||
851 | addr = (*the_target->stopped_data_address) (); | |
852 | ||
853 | /* Convert each byte of the address into two hexadecimal chars. | |
854 | Note that we take sizeof (void *) instead of sizeof (addr); | |
855 | this is to avoid sending a 64-bit address to a 32-bit GDB. */ | |
856 | for (i = sizeof (void *) * 2; i > 0; i--) | |
857 | { | |
858 | *buf++ = tohex ((addr >> (i - 1) * 4) & 0xf); | |
859 | } | |
860 | *buf++ = ';'; | |
861 | } | |
862 | ||
0a30fbc4 | 863 | while (*regp) |
5c44784c | 864 | { |
0a30fbc4 DJ |
865 | buf = outreg (find_regno (*regp), buf); |
866 | regp ++; | |
5c44784c | 867 | } |
c906108c | 868 | |
0d62e5e8 DJ |
869 | /* Formerly, if the debugger had not used any thread features we would not |
870 | burden it with a thread status response. This was for the benefit of | |
871 | GDB 4.13 and older. However, in recent GDB versions the check | |
872 | (``if (cont_thread != 0)'') does not have the desired effect because of | |
873 | sillyness in the way that the remote protocol handles specifying a thread. | |
874 | Since thread support relies on qSymbol support anyway, assume GDB can handle | |
875 | threads. */ | |
876 | ||
877 | if (using_threads) | |
c906108c | 878 | { |
b92a518e DJ |
879 | unsigned int gdb_id_from_wait; |
880 | ||
0d62e5e8 DJ |
881 | /* FIXME right place to set this? */ |
882 | thread_from_wait = ((struct inferior_list_entry *)current_inferior)->id; | |
b92a518e | 883 | gdb_id_from_wait = thread_to_gdb_id (current_inferior); |
a06660f7 | 884 | |
0d62e5e8 | 885 | if (debug_threads) |
a1928bad | 886 | fprintf (stderr, "Writing resume reply for %ld\n\n", thread_from_wait); |
89a208da DJ |
887 | /* This if (1) ought to be unnecessary. But remote_wait in GDB |
888 | will claim this event belongs to inferior_ptid if we do not | |
889 | specify a thread, and there's no way for gdbserver to know | |
890 | what inferior_ptid is. */ | |
891 | if (1 || old_thread_from_wait != thread_from_wait) | |
c906108c | 892 | { |
0d62e5e8 | 893 | general_thread = thread_from_wait; |
a06660f7 | 894 | sprintf (buf, "thread:%x;", gdb_id_from_wait); |
c906108c SS |
895 | buf += strlen (buf); |
896 | old_thread_from_wait = thread_from_wait; | |
897 | } | |
898 | } | |
899 | } | |
900 | /* For W and X, we're done. */ | |
901 | *buf++ = 0; | |
902 | } | |
903 | ||
904 | void | |
fba45db2 | 905 | decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr) |
c906108c SS |
906 | { |
907 | int i = 0, j = 0; | |
908 | char ch; | |
909 | *mem_addr_ptr = *len_ptr = 0; | |
910 | ||
911 | while ((ch = from[i++]) != ',') | |
912 | { | |
913 | *mem_addr_ptr = *mem_addr_ptr << 4; | |
914 | *mem_addr_ptr |= fromhex (ch) & 0x0f; | |
915 | } | |
916 | ||
917 | for (j = 0; j < 4; j++) | |
918 | { | |
919 | if ((ch = from[i++]) == 0) | |
920 | break; | |
921 | *len_ptr = *len_ptr << 4; | |
922 | *len_ptr |= fromhex (ch) & 0x0f; | |
923 | } | |
924 | } | |
925 | ||
926 | void | |
fba45db2 | 927 | decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr, |
f450004a | 928 | unsigned char *to) |
c906108c SS |
929 | { |
930 | int i = 0; | |
931 | char ch; | |
932 | *mem_addr_ptr = *len_ptr = 0; | |
933 | ||
934 | while ((ch = from[i++]) != ',') | |
935 | { | |
936 | *mem_addr_ptr = *mem_addr_ptr << 4; | |
937 | *mem_addr_ptr |= fromhex (ch) & 0x0f; | |
938 | } | |
939 | ||
940 | while ((ch = from[i++]) != ':') | |
941 | { | |
942 | *len_ptr = *len_ptr << 4; | |
943 | *len_ptr |= fromhex (ch) & 0x0f; | |
944 | } | |
945 | ||
946 | convert_ascii_to_int (&from[i++], to, *len_ptr); | |
947 | } | |
2f2893d9 | 948 | |
01f9e8fa DJ |
949 | int |
950 | decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr, | |
951 | unsigned int *len_ptr, unsigned char *to) | |
952 | { | |
953 | int i = 0; | |
954 | char ch; | |
955 | *mem_addr_ptr = *len_ptr = 0; | |
956 | ||
957 | while ((ch = from[i++]) != ',') | |
958 | { | |
959 | *mem_addr_ptr = *mem_addr_ptr << 4; | |
960 | *mem_addr_ptr |= fromhex (ch) & 0x0f; | |
961 | } | |
962 | ||
963 | while ((ch = from[i++]) != ':') | |
964 | { | |
965 | *len_ptr = *len_ptr << 4; | |
966 | *len_ptr |= fromhex (ch) & 0x0f; | |
967 | } | |
968 | ||
969 | if (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i, | |
970 | to, *len_ptr) != *len_ptr) | |
971 | return -1; | |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
fd500816 DJ |
976 | /* Ask GDB for the address of NAME, and return it in ADDRP if found. |
977 | Returns 1 if the symbol is found, 0 if it is not, -1 on error. */ | |
978 | ||
2f2893d9 DJ |
979 | int |
980 | look_up_one_symbol (const char *name, CORE_ADDR *addrp) | |
981 | { | |
982 | char own_buf[266], *p, *q; | |
983 | int len; | |
fd500816 DJ |
984 | struct sym_cache *sym; |
985 | ||
986 | /* Check the cache first. */ | |
987 | for (sym = symbol_cache; sym; sym = sym->next) | |
988 | if (strcmp (name, sym->name) == 0) | |
989 | { | |
990 | *addrp = sym->addr; | |
991 | return 1; | |
992 | } | |
2f2893d9 | 993 | |
ea025f5f DJ |
994 | /* If we've passed the call to thread_db_look_up_symbols, then |
995 | anything not in the cache must not exist; we're not interested | |
996 | in any libraries loaded after that point, only in symbols in | |
997 | libpthread.so. It might not be an appropriate time to look | |
998 | up a symbol, e.g. while we're trying to fetch registers. */ | |
999 | if (all_symbols_looked_up) | |
1000 | return 0; | |
1001 | ||
2f2893d9 DJ |
1002 | /* Send the request. */ |
1003 | strcpy (own_buf, "qSymbol:"); | |
1004 | hexify (own_buf + strlen ("qSymbol:"), name, strlen (name)); | |
1005 | if (putpkt (own_buf) < 0) | |
1006 | return -1; | |
1007 | ||
1008 | /* FIXME: Eventually add buffer overflow checking (to getpkt?) */ | |
1009 | len = getpkt (own_buf); | |
1010 | if (len < 0) | |
1011 | return -1; | |
1012 | ||
1013 | if (strncmp (own_buf, "qSymbol:", strlen ("qSymbol:")) != 0) | |
1014 | { | |
1015 | /* Malformed response. */ | |
1016 | if (remote_debug) | |
0d62e5e8 DJ |
1017 | { |
1018 | fprintf (stderr, "Malformed response to qSymbol, ignoring.\n"); | |
1019 | fflush (stderr); | |
1020 | } | |
1021 | ||
2f2893d9 DJ |
1022 | return -1; |
1023 | } | |
1024 | ||
1025 | p = own_buf + strlen ("qSymbol:"); | |
1026 | q = p; | |
1027 | while (*q && *q != ':') | |
1028 | q++; | |
1029 | ||
1030 | /* Make sure we found a value for the symbol. */ | |
1031 | if (p == q || *q == '\0') | |
1032 | return 0; | |
1033 | ||
1034 | decode_address (addrp, p, q - p); | |
fd500816 DJ |
1035 | |
1036 | /* Save the symbol in our cache. */ | |
1037 | sym = malloc (sizeof (*sym)); | |
1038 | sym->name = strdup (name); | |
1039 | sym->addr = *addrp; | |
1040 | sym->next = symbol_cache; | |
1041 | symbol_cache = sym; | |
1042 | ||
2f2893d9 DJ |
1043 | return 1; |
1044 | } |