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gdb_server -- symbol cleanup
[openocd/openocdswd.git] / src / server / gdb_server.c
blobb2527d21d818e2f12324b0ca576c1a5a11423b41
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007-2009 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
20 * *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <target/breakpoints.h>
31 #include <target/target_request.h>
32 #include <target/register.h>
33 #include "server.h"
34 #include <flash/nor/core.h>
35 #include "gdb_server.h"
36 #include <target/image.h>
37 #include <jtag/jtag.h>
38
39
40 /**
41 * @file
42 * GDB server implementation.
43 *
44 * This implements the GDB Remote Serial Protocol, over TCP connections,
45 * giving GDB access to the JTAG or other hardware debugging facilities
46 * found in most modern embedded processors.
47 */
48
49 /* private connection data for GDB */
50 struct gdb_connection
51 {
52 char buffer[GDB_BUFFER_SIZE];
53 char *buf_p;
54 int buf_cnt;
55 int ctrl_c;
56 enum target_state frontend_state;
57 struct image *vflash_image;
58 int closed;
59 int busy;
60 int noack_mode;
61 bool sync; /* set flag to true if you want the next stepi to return immediately.
62 allowing GDB to pick up a fresh set of register values from the target
63 without modifying the target state. */
64
65 };
66
67
68 #if 0
69 #define _DEBUG_GDB_IO_
70 #endif
71
72 static struct gdb_connection *current_gdb_connection;
73
74 static int gdb_breakpoint_override;
75 static enum breakpoint_type gdb_breakpoint_override_type;
76
77 static int gdb_error(struct connection *connection, int retval);
78 static unsigned short gdb_port = 3333;
79 static unsigned short gdb_port_next = 0;
80 static const char DIGITS[16] = "0123456789abcdef";
81
82 static void gdb_log_callback(void *priv, const char *file, unsigned line,
83 const char *function, const char *string);
84
85 /* number of gdb connections, mainly to suppress gdb related debugging spam
86 * in helper/log.c when no gdb connections are actually active */
87 int gdb_actual_connections;
88
89 /* set if we are sending a memory map to gdb
90 * via qXfer:memory-map:read packet */
91 /* enabled by default*/
92 static int gdb_use_memory_map = 1;
93 /* enabled by default*/
94 static int gdb_flash_program = 1;
95
96 /* if set, data aborts cause an error to be reported in memory read packets
97 * see the code in gdb_read_memory_packet() for further explanations.
98 * Disabled by default.
99 */
100 static int gdb_report_data_abort;
101
102 static int gdb_last_signal(struct target *target)
103 {
104 switch (target->debug_reason)
105 {
106 case DBG_REASON_DBGRQ:
107 return 0x2; /* SIGINT */
108 case DBG_REASON_BREAKPOINT:
109 case DBG_REASON_WATCHPOINT:
110 case DBG_REASON_WPTANDBKPT:
111 return 0x05; /* SIGTRAP */
112 case DBG_REASON_SINGLESTEP:
113 return 0x05; /* SIGTRAP */
114 case DBG_REASON_NOTHALTED:
115 return 0x0; /* no signal... shouldn't happen */
116 default:
117 LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason);
118 return 0x0;
119 }
120 }
121
122 static int check_pending(struct connection *connection,
123 int timeout_s, int *got_data)
124 {
125 /* a non-blocking socket will block if there is 0 bytes available on the socket,
126 * but return with as many bytes as are available immediately
127 */
128 struct timeval tv;
129 fd_set read_fds;
130 struct gdb_connection *gdb_con = connection->priv;
131 int t;
132 if (got_data == NULL)
133 got_data=&t;
134 *got_data = 0;
135
136 if (gdb_con->buf_cnt > 0)
137 {
138 *got_data = 1;
139 return ERROR_OK;
140 }
141
142 FD_ZERO(&read_fds);
143 FD_SET(connection->fd, &read_fds);
144
145 tv.tv_sec = timeout_s;
146 tv.tv_usec = 0;
147 if (socket_select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0)
148 {
149 /* This can typically be because a "monitor" command took too long
150 * before printing any progress messages
151 */
152 if (timeout_s > 0)
153 {
154 return ERROR_GDB_TIMEOUT;
155 } else
156 {
157 return ERROR_OK;
158 }
159 }
160 *got_data = FD_ISSET(connection->fd, &read_fds) != 0;
161 return ERROR_OK;
162 }
163
164 static int gdb_get_char_inner(struct connection *connection, int* next_char)
165 {
166 struct gdb_connection *gdb_con = connection->priv;
167 int retval = ERROR_OK;
168
169 for (;;)
170 {
171 if (connection->service->type == CONNECTION_PIPE)
172 {
173 gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
174 }
175 else
176 {
177 retval = check_pending(connection, 1, NULL);
178 if (retval != ERROR_OK)
179 return retval;
180 gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
181 }
182
183 if (gdb_con->buf_cnt > 0)
184 {
185 break;
186 }
187 if (gdb_con->buf_cnt == 0)
188 {
189 gdb_con->closed = 1;
190 return ERROR_SERVER_REMOTE_CLOSED;
191 }
192
193 #ifdef _WIN32
194 errno = WSAGetLastError();
195
196 switch (errno)
197 {
198 case WSAEWOULDBLOCK:
199 usleep(1000);
200 break;
201 case WSAECONNABORTED:
202 gdb_con->closed = 1;
203 return ERROR_SERVER_REMOTE_CLOSED;
204 case WSAECONNRESET:
205 gdb_con->closed = 1;
206 return ERROR_SERVER_REMOTE_CLOSED;
207 default:
208 LOG_ERROR("read: %d", errno);
209 exit(-1);
210 }
211 #else
212 switch (errno)
213 {
214 case EAGAIN:
215 usleep(1000);
216 break;
217 case ECONNABORTED:
218 gdb_con->closed = 1;
219 return ERROR_SERVER_REMOTE_CLOSED;
220 case ECONNRESET:
221 gdb_con->closed = 1;
222 return ERROR_SERVER_REMOTE_CLOSED;
223 default:
224 LOG_ERROR("read: %s", strerror(errno));
225 gdb_con->closed = 1;
226 return ERROR_SERVER_REMOTE_CLOSED;
227 }
228 #endif
229 }
230
231 #ifdef _DEBUG_GDB_IO_
232 debug_buffer = malloc(gdb_con->buf_cnt + 1);
233 memcpy(debug_buffer, gdb_con->buffer, gdb_con->buf_cnt);
234 debug_buffer[gdb_con->buf_cnt] = 0;
235 LOG_DEBUG("received '%s'", debug_buffer);
236 free(debug_buffer);
237 #endif
238
239 gdb_con->buf_p = gdb_con->buffer;
240 gdb_con->buf_cnt--;
241 *next_char = *(gdb_con->buf_p++);
242 if (gdb_con->buf_cnt > 0)
243 connection->input_pending = 1;
244 else
245 connection->input_pending = 0;
246 #ifdef _DEBUG_GDB_IO_
247 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
248 #endif
249
250 return retval;
251 }
252
253 /**
254 * The cool thing about this fn is that it allows buf_p and buf_cnt to be
255 * held in registers in the inner loop.
256 *
257 * For small caches and embedded systems this is important!
258 */
259 static inline int gdb_get_char_fast(struct connection *connection, int* next_char, char **buf_p, int *buf_cnt)
260 {
261 int retval = ERROR_OK;
262
263 if ((*buf_cnt)-- > 0)
264 {
265 *next_char = **buf_p;
266 (*buf_p)++;
267 if (*buf_cnt > 0)
268 connection->input_pending = 1;
269 else
270 connection->input_pending = 0;
271
272 #ifdef _DEBUG_GDB_IO_
273 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
274 #endif
275
276 return ERROR_OK;
277 }
278
279 struct gdb_connection *gdb_con = connection->priv;
280 gdb_con->buf_p = *buf_p;
281 gdb_con->buf_cnt = *buf_cnt;
282 retval = gdb_get_char_inner(connection, next_char);
283 *buf_p = gdb_con->buf_p;
284 *buf_cnt = gdb_con->buf_cnt;
285
286 return retval;
287 }
288
289
290 static int gdb_get_char(struct connection *connection, int* next_char)
291 {
292 struct gdb_connection *gdb_con = connection->priv;
293 return gdb_get_char_fast(connection, next_char, &gdb_con->buf_p, &gdb_con->buf_cnt);
294 }
295
296
297 static int gdb_putback_char(struct connection *connection, int last_char)
298 {
299 struct gdb_connection *gdb_con = connection->priv;
300
301 if (gdb_con->buf_p > gdb_con->buffer)
302 {
303 *(--gdb_con->buf_p) = last_char;
304 gdb_con->buf_cnt++;
305 }
306 else
307 {
308 LOG_ERROR("BUG: couldn't put character back");
309 }
310
311 return ERROR_OK;
312 }
313
314 /* The only way we can detect that the socket is closed is the first time
315 * we write to it, we will fail. Subsequent write operations will
316 * succeed. Shudder! */
317 static int gdb_write(struct connection *connection, void *data, int len)
318 {
319 struct gdb_connection *gdb_con = connection->priv;
320 if (gdb_con->closed)
321 return ERROR_SERVER_REMOTE_CLOSED;
322
323 if (connection->service->type == CONNECTION_PIPE)
324 {
325 /* write to stdout */
326 if (write(STDOUT_FILENO, data, len) == len)
327 {
328 return ERROR_OK;
329 }
330 }
331 else
332 {
333 if (write_socket(connection->fd, data, len) == len)
334 {
335 return ERROR_OK;
336 }
337 }
338 gdb_con->closed = 1;
339 return ERROR_SERVER_REMOTE_CLOSED;
340 }
341
342 static int gdb_put_packet_inner(struct connection *connection,
343 char *buffer, int len)
344 {
345 int i;
346 unsigned char my_checksum = 0;
347 #ifdef _DEBUG_GDB_IO_
348 char *debug_buffer;
349 #endif
350 int reply;
351 int retval;
352 struct gdb_connection *gdb_con = connection->priv;
353
354 for (i = 0; i < len; i++)
355 my_checksum += buffer[i];
356
357 #ifdef _DEBUG_GDB_IO_
358 /*
359 * At this point we should have nothing in the input queue from GDB,
360 * however sometimes '-' is sent even though we've already received
361 * an ACK (+) for everything we've sent off.
362 */
363 int gotdata;
364 for (;;)
365 {
366 retval = check_pending(connection, 0, &gotdata);
367 if (retval != ERROR_OK)
368 return retval;
369 if (!gotdata)
370 break;
371 if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
372 return retval;
373 if (reply == '$') {
374 /* fix a problem with some IAR tools */
375 gdb_putback_char(connection, reply);
376 LOG_DEBUG("Unexpected start of new packet");
377 break;
378 }
379
380 LOG_WARNING("Discard unexpected char %c", reply);
381 }
382 #endif
383
384 while (1)
385 {
386 #ifdef _DEBUG_GDB_IO_
387 debug_buffer = malloc(len + 1);
388 memcpy(debug_buffer, buffer, len);
389 debug_buffer[len] = 0;
390 LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
391 free(debug_buffer);
392 #endif
393
394 char local_buffer[1024];
395 local_buffer[0] = '$';
396 if ((size_t)len + 4 <= sizeof(local_buffer))
397 {
398 /* performance gain on smaller packets by only a single call to gdb_write() */
399 memcpy(local_buffer + 1, buffer, len++);
400 local_buffer[len++] = '#';
401 local_buffer[len++] = DIGITS[(my_checksum >> 4) & 0xf];
402 local_buffer[len++] = DIGITS[my_checksum & 0xf];
403 if ((retval = gdb_write(connection, local_buffer, len)) != ERROR_OK)
404 {
405 return retval;
406 }
407 }
408 else
409 {
410 /* larger packets are transmitted directly from caller supplied buffer
411 by several calls to gdb_write() to avoid dynamic allocation */
412 local_buffer[1] = '#';
413 local_buffer[2] = DIGITS[(my_checksum >> 4) & 0xf];
414 local_buffer[3] = DIGITS[my_checksum & 0xf];
415 if ((retval = gdb_write(connection, local_buffer, 1)) != ERROR_OK)
416 {
417 return retval;
418 }
419 if ((retval = gdb_write(connection, buffer, len)) != ERROR_OK)
420 {
421 return retval;
422 }
423 if ((retval = gdb_write(connection, local_buffer + 1, 3)) != ERROR_OK)
424 {
425 return retval;
426 }
427 }
428
429 if (gdb_con->noack_mode)
430 break;
431
432 if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
433 return retval;
434
435 if (reply == '+')
436 break;
437 else if (reply == '-')
438 {
439 /* Stop sending output packets for now */
440 log_remove_callback(gdb_log_callback, connection);
441 LOG_WARNING("negative reply, retrying");
442 }
443 else if (reply == 0x3)
444 {
445 gdb_con->ctrl_c = 1;
446 if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
447 return retval;
448 if (reply == '+')
449 break;
450 else if (reply == '-')
451 {
452 /* Stop sending output packets for now */
453 log_remove_callback(gdb_log_callback, connection);
454 LOG_WARNING("negative reply, retrying");
455 }
456 else if (reply == '$') {
457 LOG_ERROR("GDB missing ack(1) - assumed good");
458 gdb_putback_char(connection, reply);
459 return ERROR_OK;
460 } else {
461
462 LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
463 gdb_con->closed = 1;
464 return ERROR_SERVER_REMOTE_CLOSED;
465 }
466 }
467 else if (reply == '$') {
468 LOG_ERROR("GDB missing ack(2) - assumed good");
469 gdb_putback_char(connection, reply);
470 return ERROR_OK;
471 }
472 else
473 {
474 LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection", reply);
475 gdb_con->closed = 1;
476 return ERROR_SERVER_REMOTE_CLOSED;
477 }
478 }
479 if (gdb_con->closed)
480 return ERROR_SERVER_REMOTE_CLOSED;
481
482 return ERROR_OK;
483 }
484
485 static int gdb_put_packet(struct connection *connection, char *buffer, int len)
486 {
487 struct gdb_connection *gdb_con = connection->priv;
488 gdb_con->busy = 1;
489 int retval = gdb_put_packet_inner(connection, buffer, len);
490 gdb_con->busy = 0;
491
492 /* we sent some data, reset timer for keep alive messages */
493 kept_alive();
494
495 return retval;
496 }
497
498 static __inline__ int fetch_packet(struct connection *connection, int *checksum_ok, int noack, int *len, char *buffer)
499 {
500 unsigned char my_checksum = 0;
501 char checksum[3];
502 int character;
503 int retval = ERROR_OK;
504
505 struct gdb_connection *gdb_con = connection->priv;
506 my_checksum = 0;
507 int count = 0;
508 count = 0;
509
510 /* move this over into local variables to use registers and give the
511 * more freedom to optimize */
512 char *buf_p = gdb_con->buf_p;
513 int buf_cnt = gdb_con->buf_cnt;
514
515 for (;;)
516 {
517 /* The common case is that we have an entire packet with no escape chars.
518 * We need to leave at least 2 bytes in the buffer to have
519 * gdb_get_char() update various bits and bobs correctly.
520 */
521 if ((buf_cnt > 2) && ((buf_cnt + count) < *len))
522 {
523 /* The compiler will struggle a bit with constant propagation and
524 * aliasing, so we help it by showing that these values do not
525 * change inside the loop
526 */
527 int i;
528 char *buf = buf_p;
529 int run = buf_cnt - 2;
530 i = 0;
531 int done = 0;
532 while (i < run)
533 {
534 character = *buf++;
535 i++;
536 if (character == '#')
537 {
538 /* Danger! character can be '#' when esc is
539 * used so we need an explicit boolean for done here.
540 */
541 done = 1;
542 break;
543 }
544
545 if (character == '}')
546 {
547 /* data transmitted in binary mode (X packet)
548 * uses 0x7d as escape character */
549 my_checksum += character & 0xff;
550 character = *buf++;
551 i++;
552 my_checksum += character & 0xff;
553 buffer[count++] = (character ^ 0x20) & 0xff;
554 }
555 else
556 {
557 my_checksum += character & 0xff;
558 buffer[count++] = character & 0xff;
559 }
560 }
561 buf_p += i;
562 buf_cnt -= i;
563 if (done)
564 break;
565 }
566 if (count > *len)
567 {
568 LOG_ERROR("packet buffer too small");
569 retval = ERROR_GDB_BUFFER_TOO_SMALL;
570 break;
571 }
572
573 retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt);
574 if (retval != ERROR_OK)
575 break;
576
577 if (character == '#')
578 break;
579
580 if (character == '}')
581 {
582 /* data transmitted in binary mode (X packet)
583 * uses 0x7d as escape character */
584 my_checksum += character & 0xff;
585
586 retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt);
587 if (retval != ERROR_OK)
588 break;
589
590 my_checksum += character & 0xff;
591 buffer[count++] = (character ^ 0x20) & 0xff;
592 }
593 else
594 {
595 my_checksum += character & 0xff;
596 buffer[count++] = character & 0xff;
597 }
598 }
599
600 gdb_con->buf_p = buf_p;
601 gdb_con->buf_cnt = buf_cnt;
602
603 if (retval != ERROR_OK)
604 return retval;
605
606 *len = count;
607
608 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
609 return retval;
610 checksum[0] = character;
611 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
612 return retval;
613 checksum[1] = character;
614 checksum[2] = 0;
615
616 if (!noack)
617 {
618 *checksum_ok = (my_checksum == strtoul(checksum, NULL, 16));
619 }
620
621 return ERROR_OK;
622 }
623
624 static int gdb_get_packet_inner(struct connection *connection,
625 char *buffer, int *len)
626 {
627 int character;
628 int retval;
629 struct gdb_connection *gdb_con = connection->priv;
630
631 while (1)
632 {
633 do
634 {
635 if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
636 return retval;
637
638 #ifdef _DEBUG_GDB_IO_
639 LOG_DEBUG("character: '%c'", character);
640 #endif
641
642 switch (character)
643 {
644 case '$':
645 break;
646 case '+':
647 /* gdb sends a dummy ack '+' at every remote connect - see remote_start_remote (remote.c)
648 * in case anyone tries to debug why they receive this warning every time */
649 LOG_WARNING("acknowledgment received, but no packet pending");
650 break;
651 case '-':
652 LOG_WARNING("negative acknowledgment, but no packet pending");
653 break;
654 case 0x3:
655 gdb_con->ctrl_c = 1;
656 *len = 0;
657 return ERROR_OK;
658 default:
659 LOG_WARNING("ignoring character 0x%x", character);
660 break;
661 }
662 } while (character != '$');
663
664
665
666 int checksum_ok = 0;
667 /* explicit code expansion here to get faster inlined code in -O3 by not
668 * calculating checksum
669 */
670 if (gdb_con->noack_mode)
671 {
672 if ((retval = fetch_packet(connection, &checksum_ok, 1, len, buffer)) != ERROR_OK)
673 return retval;
674 } else
675 {
676 if ((retval = fetch_packet(connection, &checksum_ok, 0, len, buffer)) != ERROR_OK)
677 return retval;
678 }
679
680 if (gdb_con->noack_mode)
681 {
682 /* checksum is not checked in noack mode */
683 break;
684 }
685 if (checksum_ok)
686 {
687 if ((retval = gdb_write(connection, "+", 1)) != ERROR_OK)
688 {
689 return retval;
690 }
691 break;
692 }
693 }
694 if (gdb_con->closed)
695 return ERROR_SERVER_REMOTE_CLOSED;
696
697 return ERROR_OK;
698 }
699
700 static int gdb_get_packet(struct connection *connection, char *buffer, int *len)
701 {
702 struct gdb_connection *gdb_con = connection->priv;
703 gdb_con->busy = 1;
704 int retval = gdb_get_packet_inner(connection, buffer, len);
705 gdb_con->busy = 0;
706 return retval;
707 }
708
709 static int gdb_output_con(struct connection *connection, const char* line)
710 {
711 char *hex_buffer;
712 int i, bin_size;
713
714 bin_size = strlen(line);
715
716 hex_buffer = malloc(bin_size*2 + 2);
717 if (hex_buffer == NULL)
718 return ERROR_GDB_BUFFER_TOO_SMALL;
719
720 hex_buffer[0] = 'O';
721 for (i = 0; i < bin_size; i++)
722 snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
723 hex_buffer[bin_size*2 + 1] = 0;
724
725 int retval = gdb_put_packet(connection, hex_buffer, bin_size*2 + 1);
726
727 free(hex_buffer);
728 return retval;
729 }
730
731 static int gdb_output(struct command_context *context, const char* line)
732 {
733 /* this will be dumped to the log and also sent as an O packet if possible */
734 LOG_USER_N("%s", line);
735 return ERROR_OK;
736 }
737
738
739 static void gdb_frontend_halted(struct target *target, struct connection *connection)
740 {
741 struct gdb_connection *gdb_connection = connection->priv;
742
743 /* In the GDB protocol when we are stepping or continuing execution,
744 * we have a lingering reply. Upon receiving a halted event
745 * when we have that lingering packet, we reply to the original
746 * step or continue packet.
747 *
748 * Executing monitor commands can bring the target in and
749 * out of the running state so we'll see lots of TARGET_EVENT_XXX
750 * that are to be ignored.
751 */
752 if (gdb_connection->frontend_state == TARGET_RUNNING)
753 {
754 char sig_reply[4];
755 int signal;
756
757 /* stop forwarding log packets! */
758 log_remove_callback(gdb_log_callback, connection);
759
760 if (gdb_connection->ctrl_c)
761 {
762 signal = 0x2;
763 gdb_connection->ctrl_c = 0;
764 }
765 else
766 {
767 signal = gdb_last_signal(target);
768 }
769
770 snprintf(sig_reply, 4, "T%2.2x", signal);
771 gdb_put_packet(connection, sig_reply, 3);
772 gdb_connection->frontend_state = TARGET_HALTED;
773 }
774 }
775
776 static int gdb_target_callback_event_handler(struct target *target,
777 enum target_event event, void *priv)
778 {
779 int retval;
780 struct connection *connection = priv;
781
782 target_handle_event(target, event);
783 switch (event)
784 {
785 case TARGET_EVENT_GDB_HALT:
786 gdb_frontend_halted(target, connection);
787 break;
788 case TARGET_EVENT_HALTED:
789 target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
790 break;
791 case TARGET_EVENT_GDB_FLASH_ERASE_START:
792 target_handle_event(target, TARGET_EVENT_OLD_gdb_program_config);
793 if ((retval = jtag_execute_queue()) != ERROR_OK)
794 {
795 return retval;
796 }
797 break;
798 default:
799 break;
800 }
801
802 return ERROR_OK;
803 }
804
805 static int gdb_new_connection(struct connection *connection)
806 {
807 struct gdb_connection *gdb_connection = malloc(sizeof(struct gdb_connection));
808 struct gdb_service *gdb_service = connection->service->priv;
809 int retval;
810 int initial_ack;
811
812 connection->priv = gdb_connection;
813
814 /* initialize gdb connection information */
815 gdb_connection->buf_p = gdb_connection->buffer;
816 gdb_connection->buf_cnt = 0;
817 gdb_connection->ctrl_c = 0;
818 gdb_connection->frontend_state = TARGET_HALTED;
819 gdb_connection->vflash_image = NULL;
820 gdb_connection->closed = 0;
821 gdb_connection->busy = 0;
822 gdb_connection->noack_mode = 0;
823 gdb_connection->sync = true;
824
825 /* send ACK to GDB for debug request */
826 gdb_write(connection, "+", 1);
827
828 /* output goes through gdb connection */
829 command_set_output_handler(connection->cmd_ctx, gdb_output, connection);
830
831 /* we must remove all breakpoints registered to the target as a previous
832 * GDB session could leave dangling breakpoints if e.g. communication
833 * timed out.
834 */
835 breakpoint_clear_target(gdb_service->target);
836 watchpoint_clear_target(gdb_service->target);
837
838 /* register callback to be informed about target events */
839 target_register_event_callback(gdb_target_callback_event_handler, connection);
840
841 /* remove the initial ACK from the incoming buffer */
842 if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
843 return retval;
844
845 /* FIX!!!??? would we actually ever receive a + here???
846 * Not observed.
847 */
848 if (initial_ack != '+')
849 gdb_putback_char(connection, initial_ack);
850 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);
851
852 gdb_actual_connections++;
853 LOG_DEBUG("New GDB Connection: %d, Target %s, state: %s",
854 gdb_actual_connections,
855 target_name(gdb_service->target),
856 target_state_name(gdb_service->target));
857
858 return ERROR_OK;
859 }
860
861 static int gdb_connection_closed(struct connection *connection)
862 {
863 struct gdb_service *gdb_service = connection->service->priv;
864 struct gdb_connection *gdb_connection = connection->priv;
865
866 /* we're done forwarding messages. Tear down callback before
867 * cleaning up connection.
868 */
869 log_remove_callback(gdb_log_callback, connection);
870
871 gdb_actual_connections--;
872 LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d",
873 target_name(gdb_service->target),
874 target_state_name(gdb_service->target),
875 gdb_actual_connections);
876
877 /* see if an image built with vFlash commands is left */
878 if (gdb_connection->vflash_image)
879 {
880 image_close(gdb_connection->vflash_image);
881 free(gdb_connection->vflash_image);
882 gdb_connection->vflash_image = NULL;
883 }
884
885 /* if this connection registered a debug-message receiver delete it */
886 delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
887
888 if (connection->priv)
889 {
890 free(connection->priv);
891 connection->priv = NULL;
892 }
893 else
894 {
895 LOG_ERROR("BUG: connection->priv == NULL");
896 }
897
898
899 target_unregister_event_callback(gdb_target_callback_event_handler, connection);
900
901 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);
902
903 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
904
905 return ERROR_OK;
906 }
907
908 static void gdb_send_error(struct connection *connection, uint8_t the_error)
909 {
910 char err[4];
911 snprintf(err, 4, "E%2.2X", the_error);
912 gdb_put_packet(connection, err, 3);
913 }
914
915 static int gdb_last_signal_packet(struct connection *connection,
916 struct target *target, char* packet, int packet_size)
917 {
918 char sig_reply[4];
919 int signal;
920
921 signal = gdb_last_signal(target);
922
923 snprintf(sig_reply, 4, "S%2.2x", signal);
924 gdb_put_packet(connection, sig_reply, 3);
925
926 return ERROR_OK;
927 }
928
929 static int gdb_reg_pos(struct target *target, int pos, int len)
930 {
931 if (target->endianness == TARGET_LITTLE_ENDIAN)
932 return pos;
933 else
934 return len - 1 - pos;
935 }
936
937 /* Convert register to string of bytes. NB! The # of bits in the
938 * register might be non-divisible by 8(a byte), in which
939 * case an entire byte is shown.
940 *
941 * NB! the format on the wire is the target endianness
942 *
943 * The format of reg->value is little endian
944 *
945 */
946 static void gdb_str_to_target(struct target *target,
947 char *tstr, struct reg *reg)
948 {
949 int i;
950
951 uint8_t *buf;
952 int buf_len;
953 buf = reg->value;
954 buf_len = DIV_ROUND_UP(reg->size, 8);
955
956 for (i = 0; i < buf_len; i++)
957 {
958 int j = gdb_reg_pos(target, i, buf_len);
959 tstr[i*2] = DIGITS[(buf[j]>>4) & 0xf];
960 tstr[i*2 + 1] = DIGITS[buf[j]&0xf];
961 }
962 }
963
964 static int hextoint(int c)
965 {
966 if (c>='0'&&c<='9')
967 {
968 return c-'0';
969 }
970 c = toupper(c);
971 if (c>='A'&&c<='F')
972 {
973 return c-'A'+10;
974 }
975 LOG_ERROR("BUG: invalid register value %08x", c);
976 return 0;
977 }
978
979 /* copy over in register buffer */
980 static void gdb_target_to_reg(struct target *target,
981 char *tstr, int str_len, uint8_t *bin)
982 {
983 if (str_len % 2)
984 {
985 LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
986 exit(-1);
987 }
988
989 int i;
990 for (i = 0; i < str_len; i += 2)
991 {
992 uint8_t t = hextoint(tstr[i]) << 4;
993 t |= hextoint(tstr[i + 1]);
994
995 int j = gdb_reg_pos(target, i/2, str_len/2);
996 bin[j] = t;
997 }
998 }
999
1000 static int gdb_get_registers_packet(struct connection *connection,
1001 struct target *target, char* packet, int packet_size)
1002 {
1003 struct reg **reg_list;
1004 int reg_list_size;
1005 int retval;
1006 int reg_packet_size = 0;
1007 char *reg_packet;
1008 char *reg_packet_p;
1009 int i;
1010
1011 #ifdef _DEBUG_GDB_IO_
1012 LOG_DEBUG("-");
1013 #endif
1014
1015 if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1016 {
1017 return gdb_error(connection, retval);
1018 }
1019
1020 for (i = 0; i < reg_list_size; i++)
1021 {
1022 reg_packet_size += reg_list[i]->size;
1023 }
1024
1025 reg_packet = malloc(DIV_ROUND_UP(reg_packet_size, 8) * 2);
1026 reg_packet_p = reg_packet;
1027
1028 for (i = 0; i < reg_list_size; i++)
1029 {
1030 gdb_str_to_target(target, reg_packet_p, reg_list[i]);
1031 reg_packet_p += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
1032 }
1033
1034 #ifdef _DEBUG_GDB_IO_
1035 {
1036 char *reg_packet_p;
1037 reg_packet_p = strndup(reg_packet, DIV_ROUND_UP(reg_packet_size, 8) * 2);
1038 LOG_DEBUG("reg_packet: %s", reg_packet_p);
1039 free(reg_packet_p);
1040 }
1041 #endif
1042
1043 gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_packet_size, 8) * 2);
1044 free(reg_packet);
1045
1046 free(reg_list);
1047
1048 return ERROR_OK;
1049 }
1050
1051 static int gdb_set_registers_packet(struct connection *connection,
1052 struct target *target, char *packet, int packet_size)
1053 {
1054 int i;
1055 struct reg **reg_list;
1056 int reg_list_size;
1057 int retval;
1058 char *packet_p;
1059
1060 #ifdef _DEBUG_GDB_IO_
1061 LOG_DEBUG("-");
1062 #endif
1063
1064 /* skip command character */
1065 packet++;
1066 packet_size--;
1067
1068 if (packet_size % 2)
1069 {
1070 LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection");
1071 return ERROR_SERVER_REMOTE_CLOSED;
1072 }
1073
1074 if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1075 {
1076 return gdb_error(connection, retval);
1077 }
1078
1079 packet_p = packet;
1080 for (i = 0; i < reg_list_size; i++)
1081 {
1082 uint8_t *bin_buf;
1083 int chars = (DIV_ROUND_UP(reg_list[i]->size, 8) * 2);
1084
1085 if (packet_p + chars > packet + packet_size)
1086 {
1087 LOG_ERROR("BUG: register packet is too small for registers");
1088 }
1089
1090 bin_buf = malloc(DIV_ROUND_UP(reg_list[i]->size, 8));
1091 gdb_target_to_reg(target, packet_p, chars, bin_buf);
1092
1093 reg_list[i]->type->set(reg_list[i], bin_buf);
1094
1095 /* advance packet pointer */
1096 packet_p += chars;
1097
1098
1099 free(bin_buf);
1100 }
1101
1102 /* free struct reg *reg_list[] array allocated by get_gdb_reg_list */
1103 free(reg_list);
1104
1105 gdb_put_packet(connection, "OK", 2);
1106
1107 return ERROR_OK;
1108 }
1109
1110 static int gdb_get_register_packet(struct connection *connection,
1111 struct target *target, char *packet, int packet_size)
1112 {
1113 char *reg_packet;
1114 int reg_num = strtoul(packet + 1, NULL, 16);
1115 struct reg **reg_list;
1116 int reg_list_size;
1117 int retval;
1118
1119 #ifdef _DEBUG_GDB_IO_
1120 LOG_DEBUG("-");
1121 #endif
1122
1123 if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1124 {
1125 return gdb_error(connection, retval);
1126 }
1127
1128 if (reg_list_size <= reg_num)
1129 {
1130 LOG_ERROR("gdb requested a non-existing register");
1131 exit(-1);
1132 }
1133
1134 reg_packet = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1135
1136 gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
1137
1138 gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1139
1140 free(reg_list);
1141 free(reg_packet);
1142
1143 return ERROR_OK;
1144 }
1145
1146 static int gdb_set_register_packet(struct connection *connection,
1147 struct target *target, char *packet, int packet_size)
1148 {
1149 char *separator;
1150 uint8_t *bin_buf;
1151 int reg_num = strtoul(packet + 1, &separator, 16);
1152 struct reg **reg_list;
1153 int reg_list_size;
1154 int retval;
1155
1156 LOG_DEBUG("-");
1157
1158 if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
1159 {
1160 return gdb_error(connection, retval);
1161 }
1162
1163 if (reg_list_size < reg_num)
1164 {
1165 LOG_ERROR("gdb requested a non-existing register");
1166 return ERROR_SERVER_REMOTE_CLOSED;
1167 }
1168
1169 if (*separator != '=')
1170 {
1171 LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
1172 return ERROR_SERVER_REMOTE_CLOSED;
1173 }
1174
1175 /* convert from GDB-string (target-endian) to hex-string (big-endian) */
1176 bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
1177 int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1178
1179 /* fix!!! add some sanity checks on packet size here */
1180
1181 gdb_target_to_reg(target, separator + 1, chars, bin_buf);
1182
1183 reg_list[reg_num]->type->set(reg_list[reg_num], bin_buf);
1184
1185 gdb_put_packet(connection, "OK", 2);
1186
1187 free(bin_buf);
1188 free(reg_list);
1189
1190 return ERROR_OK;
1191 }
1192
1193 static int gdb_error(struct connection *connection, int retval)
1194 {
1195 switch (retval)
1196 {
1197 case ERROR_TARGET_DATA_ABORT:
1198 gdb_send_error(connection, EIO);
1199 break;
1200 case ERROR_TARGET_TRANSLATION_FAULT:
1201 gdb_send_error(connection, EFAULT);
1202 break;
1203 case ERROR_TARGET_UNALIGNED_ACCESS:
1204 gdb_send_error(connection, EFAULT);
1205 break;
1206 case ERROR_TARGET_NOT_HALTED:
1207 gdb_send_error(connection, EFAULT);
1208 break;
1209 default:
1210 /* This could be that the target reset itself. */
1211 LOG_ERROR("unexpected error %i", retval);
1212 gdb_send_error(connection, EFAULT);
1213 break;
1214 }
1215
1216 return ERROR_OK;
1217 }
1218
1219 /* We don't have to worry about the default 2 second timeout for GDB packets,
1220 * because GDB breaks up large memory reads into smaller reads.
1221 *
1222 * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
1223 */
1224 static int gdb_read_memory_packet(struct connection *connection,
1225 struct target *target, char *packet, int packet_size)
1226 {
1227 char *separator;
1228 uint32_t addr = 0;
1229 uint32_t len = 0;
1230
1231 uint8_t *buffer;
1232 char *hex_buffer;
1233
1234 int retval = ERROR_OK;
1235
1236 /* skip command character */
1237 packet++;
1238
1239 addr = strtoul(packet, &separator, 16);
1240
1241 if (*separator != ',')
1242 {
1243 LOG_ERROR("incomplete read memory packet received, dropping connection");
1244 return ERROR_SERVER_REMOTE_CLOSED;
1245 }
1246
1247 len = strtoul(separator + 1, NULL, 16);
1248
1249 buffer = malloc(len);
1250
1251 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1252
1253 retval = target_read_buffer(target, addr, len, buffer);
1254
1255 if ((retval != ERROR_OK)&&!gdb_report_data_abort)
1256 {
1257 /* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
1258 * At some point this might be fixed in GDB, in which case this code can be removed.
1259 *
1260 * OpenOCD developers are acutely aware of this problem, but there is nothing
1261 * gained by involving the user in this problem that hopefully will get resolved
1262 * eventually
1263 *
1264 * http://sourceware.org/cgi-bin/gnatsweb.pl?cmd = view%20audit-trail&database = gdb&pr = 2395
1265 *
1266 * For now, the default is to fix up things to make current GDB versions work.
1267 * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
1268 */
1269 memset(buffer, 0, len);
1270 retval = ERROR_OK;
1271 }
1272
1273 if (retval == ERROR_OK)
1274 {
1275 hex_buffer = malloc(len * 2 + 1);
1276
1277 uint32_t i;
1278 for (i = 0; i < len; i++)
1279 {
1280 uint8_t t = buffer[i];
1281 hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
1282 hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
1283 }
1284
1285 gdb_put_packet(connection, hex_buffer, len * 2);
1286
1287 free(hex_buffer);
1288 }
1289 else
1290 {
1291 retval = gdb_error(connection, retval);
1292 }
1293
1294 free(buffer);
1295
1296 return retval;
1297 }
1298
1299 static int gdb_write_memory_packet(struct connection *connection,
1300 struct target *target, char *packet, int packet_size)
1301 {
1302 char *separator;
1303 uint32_t addr = 0;
1304 uint32_t len = 0;
1305
1306 uint8_t *buffer;
1307
1308 uint32_t i;
1309 int retval;
1310
1311 /* skip command character */
1312 packet++;
1313
1314 addr = strtoul(packet, &separator, 16);
1315
1316 if (*separator != ',')
1317 {
1318 LOG_ERROR("incomplete write memory packet received, dropping connection");
1319 return ERROR_SERVER_REMOTE_CLOSED;
1320 }
1321
1322 len = strtoul(separator + 1, &separator, 16);
1323
1324 if (*(separator++) != ':')
1325 {
1326 LOG_ERROR("incomplete write memory packet received, dropping connection");
1327 return ERROR_SERVER_REMOTE_CLOSED;
1328 }
1329
1330 buffer = malloc(len);
1331
1332 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1333
1334 for (i = 0; i < len; i++)
1335 {
1336 uint32_t tmp;
1337 sscanf(separator + 2*i, "%2" SCNx32 , &tmp);
1338 buffer[i] = tmp;
1339 }
1340
1341 retval = target_write_buffer(target, addr, len, buffer);
1342
1343 if (retval == ERROR_OK)
1344 {
1345 gdb_put_packet(connection, "OK", 2);
1346 }
1347 else
1348 {
1349 retval = gdb_error(connection, retval);
1350 }
1351
1352 free(buffer);
1353
1354 return retval;
1355 }
1356
1357 static int gdb_write_memory_binary_packet(struct connection *connection,
1358 struct target *target, char *packet, int packet_size)
1359 {
1360 char *separator;
1361 uint32_t addr = 0;
1362 uint32_t len = 0;
1363
1364 int retval;
1365
1366 /* skip command character */
1367 packet++;
1368
1369 addr = strtoul(packet, &separator, 16);
1370
1371 if (*separator != ',')
1372 {
1373 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1374 return ERROR_SERVER_REMOTE_CLOSED;
1375 }
1376
1377 len = strtoul(separator + 1, &separator, 16);
1378
1379 if (*(separator++) != ':')
1380 {
1381 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1382 return ERROR_SERVER_REMOTE_CLOSED;
1383 }
1384
1385 retval = ERROR_OK;
1386 if (len)
1387 {
1388 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1389
1390 retval = target_write_buffer(target, addr, len, (uint8_t*)separator);
1391 }
1392
1393 if (retval == ERROR_OK)
1394 {
1395 gdb_put_packet(connection, "OK", 2);
1396 }
1397 else
1398 {
1399 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1400 return retval;
1401 }
1402
1403 return ERROR_OK;
1404 }
1405
1406 static int gdb_step_continue_packet(struct connection *connection,
1407 struct target *target, char *packet, int packet_size)
1408 {
1409 int current = 0;
1410 uint32_t address = 0x0;
1411 int retval = ERROR_OK;
1412
1413 LOG_DEBUG("-");
1414
1415 if (packet_size > 1)
1416 {
1417 packet[packet_size] = 0;
1418 address = strtoul(packet + 1, NULL, 16);
1419 }
1420 else
1421 {
1422 current = 1;
1423 }
1424
1425 if (packet[0] == 'c')
1426 {
1427 LOG_DEBUG("continue");
1428 target_handle_event(target, TARGET_EVENT_OLD_pre_resume);
1429 retval = target_resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
1430 }
1431 else if (packet[0] == 's')
1432 {
1433 LOG_DEBUG("step");
1434 /* step at current or address, don't handle breakpoints */
1435 retval = target_step(target, current, address, 0);
1436 }
1437 return retval;
1438 }
1439
1440 static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
1441 struct target *target, char *packet, int packet_size)
1442 {
1443 int type;
1444 enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
1445 enum watchpoint_rw wp_type = WPT_READ /* dummy init to avoid warning */;
1446 uint32_t address;
1447 uint32_t size;
1448 char *separator;
1449 int retval;
1450
1451 LOG_DEBUG("-");
1452
1453 type = strtoul(packet + 1, &separator, 16);
1454
1455 if (type == 0) /* memory breakpoint */
1456 bp_type = BKPT_SOFT;
1457 else if (type == 1) /* hardware breakpoint */
1458 bp_type = BKPT_HARD;
1459 else if (type == 2) /* write watchpoint */
1460 wp_type = WPT_WRITE;
1461 else if (type == 3) /* read watchpoint */
1462 wp_type = WPT_READ;
1463 else if (type == 4) /* access watchpoint */
1464 wp_type = WPT_ACCESS;
1465 else
1466 {
1467 LOG_ERROR("invalid gdb watch/breakpoint type(%d), dropping connection", type);
1468 return ERROR_SERVER_REMOTE_CLOSED;
1469 }
1470
1471
1472 if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT)||(bp_type == BKPT_HARD)))
1473 {
1474 bp_type = gdb_breakpoint_override_type;
1475 }
1476
1477 if (*separator != ',')
1478 {
1479 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1480 return ERROR_SERVER_REMOTE_CLOSED;
1481 }
1482
1483 address = strtoul(separator + 1, &separator, 16);
1484
1485 if (*separator != ',')
1486 {
1487 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1488 return ERROR_SERVER_REMOTE_CLOSED;
1489 }
1490
1491 size = strtoul(separator + 1, &separator, 16);
1492
1493 switch (type)
1494 {
1495 case 0:
1496 case 1:
1497 if (packet[0] == 'Z')
1498 {
1499 if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK)
1500 {
1501 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1502 return retval;
1503 }
1504 else
1505 {
1506 gdb_put_packet(connection, "OK", 2);
1507 }
1508 }
1509 else
1510 {
1511 breakpoint_remove(target, address);
1512 gdb_put_packet(connection, "OK", 2);
1513 }
1514 break;
1515 case 2:
1516 case 3:
1517 case 4:
1518 {
1519 if (packet[0] == 'Z')
1520 {
1521 if ((retval = watchpoint_add(target, address, size, wp_type, 0, 0xffffffffu)) != ERROR_OK)
1522 {
1523 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1524 return retval;
1525 }
1526 else
1527 {
1528 gdb_put_packet(connection, "OK", 2);
1529 }
1530 }
1531 else
1532 {
1533 watchpoint_remove(target, address);
1534 gdb_put_packet(connection, "OK", 2);
1535 }
1536 break;
1537 }
1538 default:
1539 break;
1540 }
1541
1542 return ERROR_OK;
1543 }
1544
1545 /* print out a string and allocate more space as needed,
1546 * mainly used for XML at this point
1547 */
1548 static void xml_printf(int *retval, char **xml, int *pos, int *size,
1549 const char *fmt, ...)
1550 {
1551 if (*retval != ERROR_OK)
1552 {
1553 return;
1554 }
1555 int first = 1;
1556
1557 for (;;)
1558 {
1559 if ((*xml == NULL) || (!first))
1560 {
1561 /* start by 0 to exercise all the code paths.
1562 * Need minimum 2 bytes to fit 1 char and 0 terminator. */
1563
1564 *size = *size * 2 + 2;
1565 char *t = *xml;
1566 *xml = realloc(*xml, *size);
1567 if (*xml == NULL)
1568 {
1569 if (t)
1570 free(t);
1571 *retval = ERROR_SERVER_REMOTE_CLOSED;
1572 return;
1573 }
1574 }
1575
1576 va_list ap;
1577 int ret;
1578 va_start(ap, fmt);
1579 ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
1580 va_end(ap);
1581 if ((ret > 0) && ((ret + 1) < *size - *pos))
1582 {
1583 *pos += ret;
1584 return;
1585 }
1586 /* there was just enough or not enough space, allocate more. */
1587 first = 0;
1588 }
1589 }
1590
1591 static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len)
1592 {
1593 char *separator;
1594
1595 /* Extract and NUL-terminate the annex. */
1596 *annex = buf;
1597 while (*buf && *buf != ':')
1598 buf++;
1599 if (*buf == '\0')
1600 return -1;
1601 *buf++ = 0;
1602
1603 /* After the read marker and annex, qXfer looks like a
1604 * traditional 'm' packet. */
1605
1606 *ofs = strtoul(buf, &separator, 16);
1607
1608 if (*separator != ',')
1609 return -1;
1610
1611 *len = strtoul(separator + 1, NULL, 16);
1612
1613 return 0;
1614 }
1615
1616 static int gdb_calc_blocksize(struct flash_bank *bank)
1617 {
1618 uint32_t i;
1619 uint32_t block_size = 0xffffffff;
1620
1621 /* loop through all sectors and return smallest sector size */
1622
1623 for (i = 0; i < (uint32_t)bank->num_sectors; i++)
1624 {
1625 if (bank->sectors[i].size < block_size)
1626 block_size = bank->sectors[i].size;
1627 }
1628
1629 return block_size;
1630 }
1631
1632 static int compare_bank (const void * a, const void * b)
1633 {
1634 struct flash_bank *b1, *b2;
1635 b1=*((struct flash_bank **)a);
1636 b2=*((struct flash_bank **)b);
1637
1638 if (b1->base == b2->base)
1639 {
1640 return 0;
1641 } else if (b1->base > b2->base)
1642 {
1643 return 1;
1644 } else
1645 {
1646 return -1;
1647 }
1648 }
1649
1650 static int gdb_query_packet(struct connection *connection,
1651 struct target *target, char *packet, int packet_size)
1652 {
1653 struct command_context *cmd_ctx = connection->cmd_ctx;
1654 struct gdb_connection *gdb_connection = connection->priv;
1655
1656 if (strstr(packet, "qRcmd,"))
1657 {
1658 if (packet_size > 6)
1659 {
1660 char *cmd;
1661 int i;
1662 cmd = malloc((packet_size - 6)/2 + 1);
1663 for (i = 0; i < (packet_size - 6)/2; i++)
1664 {
1665 uint32_t tmp;
1666 sscanf(packet + 6 + 2*i, "%2" SCNx32 , &tmp);
1667 cmd[i] = tmp;
1668 }
1669 cmd[(packet_size - 6)/2] = 0x0;
1670
1671 /* We want to print all debug output to GDB connection */
1672 log_add_callback(gdb_log_callback, connection);
1673 target_call_timer_callbacks_now();
1674 /* some commands need to know the GDB connection, make note of current
1675 * GDB connection. */
1676 current_gdb_connection = gdb_connection;
1677 command_run_line(cmd_ctx, cmd);
1678 current_gdb_connection = NULL;
1679 target_call_timer_callbacks_now();
1680 log_remove_callback(gdb_log_callback, connection);
1681 free(cmd);
1682 }
1683 gdb_put_packet(connection, "OK", 2);
1684 return ERROR_OK;
1685 }
1686 else if (strstr(packet, "qCRC:"))
1687 {
1688 if (packet_size > 5)
1689 {
1690 int retval;
1691 char gdb_reply[10];
1692 char *separator;
1693 uint32_t checksum;
1694 uint32_t addr = 0;
1695 uint32_t len = 0;
1696
1697 /* skip command character */
1698 packet += 5;
1699
1700 addr = strtoul(packet, &separator, 16);
1701
1702 if (*separator != ',')
1703 {
1704 LOG_ERROR("incomplete read memory packet received, dropping connection");
1705 return ERROR_SERVER_REMOTE_CLOSED;
1706 }
1707
1708 len = strtoul(separator + 1, NULL, 16);
1709
1710 retval = target_checksum_memory(target, addr, len, &checksum);
1711
1712 if (retval == ERROR_OK)
1713 {
1714 snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
1715 gdb_put_packet(connection, gdb_reply, 9);
1716 }
1717 else
1718 {
1719 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1720 return retval;
1721 }
1722
1723 return ERROR_OK;
1724 }
1725 }
1726 else if (strstr(packet, "qSupported"))
1727 {
1728 /* we currently support packet size and qXfer:memory-map:read (if enabled)
1729 * disable qXfer:features:read for the moment */
1730 int retval = ERROR_OK;
1731 char *buffer = NULL;
1732 int pos = 0;
1733 int size = 0;
1734
1735 xml_printf(&retval, &buffer, &pos, &size,
1736 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-;QStartNoAckMode+",
1737 (GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-');
1738
1739 if (retval != ERROR_OK)
1740 {
1741 gdb_send_error(connection, 01);
1742 return ERROR_OK;
1743 }
1744
1745 gdb_put_packet(connection, buffer, strlen(buffer));
1746 free(buffer);
1747
1748 return ERROR_OK;
1749 }
1750 else if (strstr(packet, "qXfer:memory-map:read::") && (flash_get_bank_count() > 0))
1751 {
1752 /* We get away with only specifying flash here. Regions that are not
1753 * specified are treated as if we provided no memory map(if not we
1754 * could detect the holes and mark them as RAM).
1755 * Normally we only execute this code once, but no big deal if we
1756 * have to regenerate it a couple of times. */
1757
1758 struct flash_bank *p;
1759 char *xml = NULL;
1760 int size = 0;
1761 int pos = 0;
1762 int retval = ERROR_OK;
1763
1764 int offset;
1765 int length;
1766 char *separator;
1767 int blocksize;
1768
1769 /* skip command character */
1770 packet += 23;
1771
1772 offset = strtoul(packet, &separator, 16);
1773 length = strtoul(separator + 1, &separator, 16);
1774
1775 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1776
1777 /*
1778 sort banks in ascending order, we need to make non-flash memory be ram(or rather
1779 read/write) by default for GDB.
1780 GDB does not have a concept of non-cacheable read/write memory.
1781 */
1782 struct flash_bank **banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
1783 int i;
1784
1785 for (i = 0; i < flash_get_bank_count(); i++)
1786 {
1787 p = get_flash_bank_by_num(i);
1788 if (p == NULL)
1789 {
1790 free(banks);
1791 retval = ERROR_FAIL;
1792 gdb_send_error(connection, retval);
1793 return retval;
1794 }
1795 banks[i]=p;
1796 }
1797
1798 qsort(banks, flash_get_bank_count(), sizeof(struct flash_bank *), compare_bank);
1799
1800 uint32_t ram_start = 0;
1801 for (i = 0; i < flash_get_bank_count(); i++)
1802 {
1803 p = banks[i];
1804
1805 if (ram_start < p->base)
1806 {
1807 xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
1808 ram_start, p->base-ram_start);
1809 }
1810
1811 /* if device has uneven sector sizes, eg. str7, lpc
1812 * we pass the smallest sector size to gdb memory map */
1813 blocksize = gdb_calc_blocksize(p);
1814
1815 xml_printf(&retval, &xml, &pos, &size, "<memory type=\"flash\" start=\"0x%x\" length=\"0x%x\">\n" \
1816 "<property name=\"blocksize\">0x%x</property>\n" \
1817 "</memory>\n", \
1818 p->base, p->size, blocksize);
1819 ram_start = p->base + p->size;
1820 }
1821 if (ram_start != 0)
1822 {
1823 xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
1824 ram_start, 0-ram_start);
1825 } else
1826 {
1827 /* a flash chip could be at the very end of the 32 bit address space, in which case
1828 ram_start will be precisely 0 */
1829 }
1830
1831 free(banks);
1832 banks = NULL;
1833
1834 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1835
1836 if (retval != ERROR_OK)
1837 {
1838 gdb_send_error(connection, retval);
1839 return retval;
1840 }
1841
1842 if (offset + length > pos)
1843 {
1844 length = pos - offset;
1845 }
1846
1847 char *t = malloc(length + 1);
1848 t[0] = 'l';
1849 memcpy(t + 1, xml + offset, length);
1850 gdb_put_packet(connection, t, length + 1);
1851
1852 free(t);
1853 free(xml);
1854 return ERROR_OK;
1855 }
1856 else if (strstr(packet, "qXfer:features:read:"))
1857 {
1858 char *xml = NULL;
1859 int size = 0;
1860 int pos = 0;
1861 int retval = ERROR_OK;
1862
1863 int offset;
1864 unsigned int length;
1865 char *annex;
1866
1867 /* skip command character */
1868 packet += 20;
1869
1870 if (decode_xfer_read(packet, &annex, &offset, &length) < 0)
1871 {
1872 gdb_send_error(connection, 01);
1873 return ERROR_OK;
1874 }
1875
1876 if (strcmp(annex, "target.xml") != 0)
1877 {
1878 gdb_send_error(connection, 01);
1879 return ERROR_OK;
1880 }
1881
1882 xml_printf(&retval, &xml, &pos, &size, \
1883 "l < target version=\"1.0\">\n < architecture > arm</architecture>\n</target>\n");
1884
1885 if (retval != ERROR_OK)
1886 {
1887 gdb_send_error(connection, retval);
1888 return retval;
1889 }
1890
1891 gdb_put_packet(connection, xml, strlen(xml));
1892
1893 free(xml);
1894 return ERROR_OK;
1895 }
1896 else if (strstr(packet, "QStartNoAckMode"))
1897 {
1898 gdb_connection->noack_mode = 1;
1899 gdb_put_packet(connection, "OK", 2);
1900 return ERROR_OK;
1901 }
1902
1903 gdb_put_packet(connection, "", 0);
1904 return ERROR_OK;
1905 }
1906
1907 static int gdb_v_packet(struct connection *connection,
1908 struct target *target, char *packet, int packet_size)
1909 {
1910 struct gdb_connection *gdb_connection = connection->priv;
1911 struct gdb_service *gdb_service = connection->service->priv;
1912 int result;
1913
1914 /* if flash programming disabled - send a empty reply */
1915
1916 if (gdb_flash_program == 0)
1917 {
1918 gdb_put_packet(connection, "", 0);
1919 return ERROR_OK;
1920 }
1921
1922 if (strstr(packet, "vFlashErase:"))
1923 {
1924 unsigned long addr;
1925 unsigned long length;
1926
1927 char *parse = packet + 12;
1928 if (*parse == '\0')
1929 {
1930 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1931 return ERROR_SERVER_REMOTE_CLOSED;
1932 }
1933
1934 addr = strtoul(parse, &parse, 16);
1935
1936 if (*(parse++) != ',' || *parse == '\0')
1937 {
1938 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1939 return ERROR_SERVER_REMOTE_CLOSED;
1940 }
1941
1942 length = strtoul(parse, &parse, 16);
1943
1944 if (*parse != '\0')
1945 {
1946 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1947 return ERROR_SERVER_REMOTE_CLOSED;
1948 }
1949
1950 /* assume all sectors need erasing - stops any problems
1951 * when flash_write is called multiple times */
1952 flash_set_dirty();
1953
1954 /* perform any target specific operations before the erase */
1955 target_call_event_callbacks(gdb_service->target,
1956 TARGET_EVENT_GDB_FLASH_ERASE_START);
1957
1958 /* vFlashErase:addr,length messages require region start and
1959 * end to be "block" aligned ... if padding is ever needed,
1960 * GDB will have become dangerously confused.
1961 */
1962 result = flash_erase_address_range(gdb_service->target,
1963 false, addr, length);
1964
1965 /* perform any target specific operations after the erase */
1966 target_call_event_callbacks(gdb_service->target,
1967 TARGET_EVENT_GDB_FLASH_ERASE_END);
1968
1969 /* perform erase */
1970 if (result != ERROR_OK)
1971 {
1972 /* GDB doesn't evaluate the actual error number returned,
1973 * treat a failed erase as an I/O error
1974 */
1975 gdb_send_error(connection, EIO);
1976 LOG_ERROR("flash_erase returned %i", result);
1977 }
1978 else
1979 gdb_put_packet(connection, "OK", 2);
1980
1981 return ERROR_OK;
1982 }
1983
1984 if (strstr(packet, "vFlashWrite:"))
1985 {
1986 int retval;
1987 unsigned long addr;
1988 unsigned long length;
1989 char *parse = packet + 12;
1990
1991 if (*parse == '\0')
1992 {
1993 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1994 return ERROR_SERVER_REMOTE_CLOSED;
1995 }
1996 addr = strtoul(parse, &parse, 16);
1997 if (*(parse++) != ':')
1998 {
1999 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2000 return ERROR_SERVER_REMOTE_CLOSED;
2001 }
2002 length = packet_size - (parse - packet);
2003
2004 /* create a new image if there isn't already one */
2005 if (gdb_connection->vflash_image == NULL)
2006 {
2007 gdb_connection->vflash_image = malloc(sizeof(struct image));
2008 image_open(gdb_connection->vflash_image, "", "build");
2009 }
2010
2011 /* create new section with content from packet buffer */
2012 if ((retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (uint8_t*)parse)) != ERROR_OK)
2013 {
2014 return retval;
2015 }
2016
2017 gdb_put_packet(connection, "OK", 2);
2018
2019 return ERROR_OK;
2020 }
2021
2022 if (!strcmp(packet, "vFlashDone"))
2023 {
2024 uint32_t written;
2025
2026 /* process the flashing buffer. No need to erase as GDB
2027 * always issues a vFlashErase first. */
2028 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_START);
2029 result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
2030 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
2031 if (result != ERROR_OK)
2032 {
2033 if (result == ERROR_FLASH_DST_OUT_OF_BANK)
2034 gdb_put_packet(connection, "E.memtype", 9);
2035 else
2036 gdb_send_error(connection, EIO);
2037 }
2038 else
2039 {
2040 LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
2041 gdb_put_packet(connection, "OK", 2);
2042 }
2043
2044 image_close(gdb_connection->vflash_image);
2045 free(gdb_connection->vflash_image);
2046 gdb_connection->vflash_image = NULL;
2047
2048 return ERROR_OK;
2049 }
2050
2051 gdb_put_packet(connection, "", 0);
2052 return ERROR_OK;
2053 }
2054
2055 static int gdb_detach(struct connection *connection, struct target *target)
2056 {
2057 struct gdb_service *gdb_service = connection->service->priv;
2058
2059 target_call_event_callbacks(gdb_service->target,
2060 TARGET_EVENT_GDB_DETACH);
2061
2062 return gdb_put_packet(connection, "OK", 2);
2063 }
2064
2065 static void gdb_log_callback(void *priv, const char *file, unsigned line,
2066 const char *function, const char *string)
2067 {
2068 struct connection *connection = priv;
2069 struct gdb_connection *gdb_con = connection->priv;
2070
2071 if (gdb_con->busy)
2072 {
2073 /* do not reply this using the O packet */
2074 return;
2075 }
2076
2077 gdb_output_con(connection, string);
2078 }
2079
2080 static void gdb_sig_halted(struct connection *connection)
2081 {
2082 char sig_reply[4];
2083 snprintf(sig_reply, 4, "T%2.2x", 2);
2084 gdb_put_packet(connection, sig_reply, 3);
2085
2086 }
2087
2088 static int gdb_input_inner(struct connection *connection)
2089 {
2090 /* Do not allocate this on the stack */
2091 static char gdb_packet_buffer[GDB_BUFFER_SIZE];
2092
2093 struct gdb_service *gdb_service = connection->service->priv;
2094 struct target *target = gdb_service->target;
2095 char *packet = gdb_packet_buffer;
2096 int packet_size;
2097 int retval;
2098 struct gdb_connection *gdb_con = connection->priv;
2099 static int extended_protocol = 0;
2100
2101 /* drain input buffer */
2102 do
2103 {
2104 packet_size = GDB_BUFFER_SIZE-1;
2105 retval = gdb_get_packet(connection, packet, &packet_size);
2106 if (retval != ERROR_OK)
2107 return retval;
2108
2109 /* terminate with zero */
2110 packet[packet_size] = 0;
2111
2112 if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
2113 if (packet[0] == 'X') {
2114 // binary packets spew junk into the debug log stream
2115 char buf[ 50 ];
2116 int x;
2117 for (x = 0 ; (x < 49) && (packet[x] != ':') ; x++) {
2118 buf[x] = packet[x];
2119 }
2120 buf[x] = 0;
2121 LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
2122 } else {
2123 LOG_DEBUG("received packet: '%s'", packet);
2124 }
2125 }
2126
2127 if (packet_size > 0)
2128 {
2129 retval = ERROR_OK;
2130 switch (packet[0])
2131 {
2132 case 'H':
2133 /* Hct... -- set thread
2134 * we don't have threads, send empty reply */
2135 gdb_put_packet(connection, NULL, 0);
2136 break;
2137 case 'q':
2138 case 'Q':
2139 retval = gdb_query_packet(connection,
2140 target, packet,
2141 packet_size);
2142 break;
2143 case 'g':
2144 retval = gdb_get_registers_packet(
2145 connection, target,
2146 packet, packet_size);
2147 break;
2148 case 'G':
2149 retval = gdb_set_registers_packet(
2150 connection, target,
2151 packet, packet_size);
2152 break;
2153 case 'p':
2154 retval = gdb_get_register_packet(
2155 connection, target,
2156 packet, packet_size);
2157 break;
2158 case 'P':
2159 retval = gdb_set_register_packet(
2160 connection, target,
2161 packet, packet_size);
2162 break;
2163 case 'm':
2164 retval = gdb_read_memory_packet(
2165 connection, target,
2166 packet, packet_size);
2167 break;
2168 case 'M':
2169 retval = gdb_write_memory_packet(
2170 connection, target,
2171 packet, packet_size);
2172 break;
2173 case 'z':
2174 case 'Z':
2175 retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
2176 break;
2177 case '?':
2178 gdb_last_signal_packet(
2179 connection, target,
2180 packet, packet_size);
2181 break;
2182 case 'c':
2183 case 's':
2184 {
2185 int retval = ERROR_OK;
2186
2187 struct gdb_connection *gdb_con = connection->priv;
2188 log_add_callback(gdb_log_callback, connection);
2189
2190 bool nostep = false;
2191 if (target->state == TARGET_RUNNING)
2192 {
2193 LOG_WARNING("The target is already running. Halt target before stepi/continue.");
2194 retval = target_halt(target);
2195 if (retval == ERROR_OK)
2196 retval = target_wait_state(target, TARGET_HALTED, 100);
2197 } else if (target->state != TARGET_HALTED)
2198 {
2199 LOG_WARNING("The target is not in the halted nor running stated, stepi/continue ignored.");
2200 nostep = true;
2201 } else if ((packet[0] == 's') && gdb_con->sync)
2202 {
2203 /* Hmm..... when you issue a continue in GDB, then a "stepi" is
2204 * sent by GDB first to OpenOCD, thus defeating the check to
2205 * make only the single stepping have the sync feature...
2206 */
2207 nostep = true;
2208 LOG_WARNING("stepi ignored. GDB will now fetch the register state from the target.");
2209 }
2210 gdb_con->sync = false;
2211
2212 if ((retval!=ERROR_OK) || nostep)
2213 {
2214 /* Either the target isn't in the halted state, then we can't
2215 * step/continue. This might be early setup, etc.
2216 *
2217 * Or we want to allow GDB to pick up a fresh set of
2218 * register values without modifying the target state.
2219 *
2220 */
2221 gdb_sig_halted(connection);
2222
2223 /* stop forwarding log packets! */
2224 log_remove_callback(gdb_log_callback, connection);
2225 } else
2226 {
2227 /* We're running/stepping, in which case we can
2228 * forward log output until the target is halted
2229 */
2230 gdb_con->frontend_state = TARGET_RUNNING;
2231 target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
2232 int retval = gdb_step_continue_packet(connection, target, packet, packet_size);
2233 if (retval != ERROR_OK)
2234 {
2235 /* we'll never receive a halted condition... issue a false one.. */
2236 gdb_frontend_halted(target, connection);
2237 }
2238 }
2239 }
2240 break;
2241 case 'v':
2242 retval = gdb_v_packet(
2243 connection, target,
2244 packet, packet_size);
2245 break;
2246 case 'D':
2247 retval = gdb_detach(connection, target);
2248 extended_protocol = 0;
2249 break;
2250 case 'X':
2251 retval = gdb_write_memory_binary_packet(
2252 connection, target,
2253 packet, packet_size);
2254 if (retval != ERROR_OK)
2255 return retval;
2256 break;
2257 case 'k':
2258 if (extended_protocol != 0)
2259 break;
2260 gdb_put_packet(connection, "OK", 2);
2261 return ERROR_SERVER_REMOTE_CLOSED;
2262 case '!':
2263 /* handle extended remote protocol */
2264 extended_protocol = 1;
2265 gdb_put_packet(connection, "OK", 2);
2266 break;
2267 case 'R':
2268 /* handle extended restart packet */
2269 breakpoint_clear_target(gdb_service->target);
2270 watchpoint_clear_target(gdb_service->target);
2271 command_run_linef(connection->cmd_ctx,
2272 "ocd_gdb_restart %s",
2273 target_name(target));
2274 break;
2275 default:
2276 /* ignore unknown packets */
2277 LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
2278 gdb_put_packet(connection, NULL, 0);
2279 break;
2280 }
2281
2282 /* if a packet handler returned an error, exit input loop */
2283 if (retval != ERROR_OK)
2284 return retval;
2285 }
2286
2287 if (gdb_con->ctrl_c)
2288 {
2289 if (target->state == TARGET_RUNNING)
2290 {
2291 retval = target_halt(target);
2292 if (retval != ERROR_OK)
2293 {
2294 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2295 }
2296 gdb_con->ctrl_c = 0;
2297 } else
2298 {
2299 LOG_INFO("The target is not running when halt was requested, stopping GDB.");
2300 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2301 }
2302 }
2303
2304 } while (gdb_con->buf_cnt > 0);
2305
2306 return ERROR_OK;
2307 }
2308
2309 static int gdb_input(struct connection *connection)
2310 {
2311 int retval = gdb_input_inner(connection);
2312 struct gdb_connection *gdb_con = connection->priv;
2313 if (retval == ERROR_SERVER_REMOTE_CLOSED)
2314 return retval;
2315
2316 /* logging does not propagate the error, yet can set the gdb_con->closed flag */
2317 if (gdb_con->closed)
2318 return ERROR_SERVER_REMOTE_CLOSED;
2319
2320 /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
2321 return ERROR_OK;
2322 }
2323
2324 static int gdb_target_start(struct target *target, uint16_t port)
2325 {
2326 bool use_pipes = 0 == port;
2327 struct gdb_service *gdb_service = malloc(sizeof(struct gdb_service));
2328 if (NULL == gdb_service)
2329 return -ENOMEM;
2330
2331 gdb_service->target = target;
2332
2333 add_service("gdb", use_pipes ? CONNECTION_PIPE : CONNECTION_TCP,
2334 port, 1, &gdb_new_connection, &gdb_input,
2335 &gdb_connection_closed, gdb_service);
2336
2337 const char *name = target_name(target);
2338 if (use_pipes)
2339 LOG_DEBUG("gdb service for target '%s' using pipes", name);
2340 else
2341 LOG_DEBUG("gdb service for target '%s' on TCP port %u", name, port);
2342 return ERROR_OK;
2343 }
2344
2345 static int gdb_target_add_one(struct target *target)
2346 {
2347 if (gdb_port == 0 && server_use_pipes == 0)
2348 {
2349 LOG_INFO("gdb port disabled");
2350 return ERROR_OK;
2351 }
2352 if (0 == gdb_port_next)
2353 gdb_port_next = gdb_port;
2354
2355 bool use_pipes = server_use_pipes;
2356 static bool server_started_with_pipes = false;
2357 if (server_started_with_pipes)
2358 {
2359 LOG_WARNING("gdb service permits one target when using pipes");
2360 if (0 == gdb_port)
2361 return ERROR_OK;
2362
2363 use_pipes = false;
2364 }
2365
2366 int e = gdb_target_start(target, use_pipes ? 0 : gdb_port_next);
2367 if (ERROR_OK == e)
2368 {
2369 server_started_with_pipes |= use_pipes;
2370 gdb_port_next++;
2371 }
2372 return e;
2373 }
2374
2375 int gdb_target_add_all(struct target *target)
2376 {
2377 if (NULL == target)
2378 {
2379 LOG_WARNING("gdb services need one or more targets defined");
2380 return ERROR_OK;
2381 }
2382
2383 while (NULL != target)
2384 {
2385 int retval = gdb_target_add_one(target);
2386 if (ERROR_OK != retval)
2387 return retval;
2388
2389 target = target->next;
2390 }
2391
2392 return ERROR_OK;
2393 }
2394
2395 COMMAND_HANDLER(handle_gdb_sync_command)
2396 {
2397 if (CMD_ARGC != 0)
2398 {
2399 return ERROR_COMMAND_SYNTAX_ERROR;
2400 }
2401
2402 if (current_gdb_connection == NULL)
2403 {
2404 command_print(CMD_CTX,
2405 "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
2406 return ERROR_FAIL;
2407 }
2408
2409 current_gdb_connection->sync = true;
2410
2411 return ERROR_OK;
2412 }
2413
2414 /* daemon configuration command gdb_port */
2415 COMMAND_HANDLER(handle_gdb_port_command)
2416 {
2417 int retval = CALL_COMMAND_HANDLER(server_port_command, &gdb_port);
2418 if (ERROR_OK == retval)
2419 gdb_port_next = gdb_port;
2420 return retval;
2421 }
2422
2423 COMMAND_HANDLER(handle_gdb_memory_map_command)
2424 {
2425 if (CMD_ARGC == 1)
2426 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map);
2427
2428 return ERROR_COMMAND_SYNTAX_ERROR;
2429 }
2430
2431 COMMAND_HANDLER(handle_gdb_flash_program_command)
2432 {
2433 if (CMD_ARGC == 1)
2434 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program);
2435
2436 return ERROR_COMMAND_SYNTAX_ERROR;
2437 }
2438
2439 COMMAND_HANDLER(handle_gdb_report_data_abort_command)
2440 {
2441 if (CMD_ARGC == 1)
2442 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort);
2443
2444 return ERROR_COMMAND_SYNTAX_ERROR;
2445 }
2446
2447 /* gdb_breakpoint_override */
2448 COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
2449 {
2450 if (CMD_ARGC == 0)
2451 {
2452
2453 } else if (CMD_ARGC == 1)
2454 {
2455 gdb_breakpoint_override = 1;
2456 if (strcmp(CMD_ARGV[0], "hard") == 0)
2457 {
2458 gdb_breakpoint_override_type = BKPT_HARD;
2459 } else if (strcmp(CMD_ARGV[0], "soft") == 0)
2460 {
2461 gdb_breakpoint_override_type = BKPT_SOFT;
2462 } else if (strcmp(CMD_ARGV[0], "disable") == 0)
2463 {
2464 gdb_breakpoint_override = 0;
2465 }
2466 } else
2467 {
2468 return ERROR_COMMAND_SYNTAX_ERROR;
2469 }
2470 if (gdb_breakpoint_override)
2471 {
2472 LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type == BKPT_HARD)?"hard":"soft");
2473 } else
2474 {
2475 LOG_USER("breakpoint type is not overridden");
2476 }
2477
2478 return ERROR_OK;
2479 }
2480
2481 static const struct command_registration gdb_command_handlers[] = {
2482 {
2483 .name = "gdb_sync",
2484 .handler = handle_gdb_sync_command,
2485 .mode = COMMAND_ANY,
2486 .help = "next stepi will return immediately allowing "
2487 "GDB to fetch register state without affecting "
2488 "target state",
2489 },
2490 {
2491 .name = "gdb_port",
2492 .handler = handle_gdb_port_command,
2493 .mode = COMMAND_ANY,
2494 .help = "Display or specify base port on which to listen "
2495 "for incoming GDB connections. "
2496 "No arguments reports GDB port; zero disables.",
2497 .usage = "[port_num]",
2498 },
2499 {
2500 .name = "gdb_memory_map",
2501 .handler = handle_gdb_memory_map_command,
2502 .mode = COMMAND_CONFIG,
2503 .help = "enable or disable memory map",
2504 .usage = "('enable'|'disable')"
2505 },
2506 {
2507 .name = "gdb_flash_program",
2508 .handler = handle_gdb_flash_program_command,
2509 .mode = COMMAND_CONFIG,
2510 .help = "enable or disable flash program",
2511 .usage = "('enable'|'disable')"
2512 },
2513 {
2514 .name = "gdb_report_data_abort",
2515 .handler = handle_gdb_report_data_abort_command,
2516 .mode = COMMAND_CONFIG,
2517 .help = "enable or disable reporting data aborts",
2518 .usage = "('enable'|'disable')"
2519 },
2520 {
2521 .name = "gdb_breakpoint_override",
2522 .handler = handle_gdb_breakpoint_override_command,
2523 .mode = COMMAND_ANY,
2524 .help = "Display or specify type of breakpoint "
2525 "to be used by gdb 'break' commands.",
2526 .usage = "('hard'|'soft'|'disable')"
2527 },
2528 COMMAND_REGISTRATION_DONE
2529 };
2530
2531 int gdb_register_commands(struct command_context *cmd_ctx)
2532 {
2533 return register_commands(cmd_ctx, NULL, gdb_command_handlers);
2534 }
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