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target: print reason why GDB halts
[openocd/cortex.git] / src / server / gdb_server.c
blob17ca4398e6b3977f5b57061895d994a7cb789f4c
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 compare_bank (const void * a, const void * b)
1617 {
1618 struct flash_bank *b1, *b2;
1619 b1=*((struct flash_bank **)a);
1620 b2=*((struct flash_bank **)b);
1621
1622 if (b1->base == b2->base)
1623 {
1624 return 0;
1625 } else if (b1->base > b2->base)
1626 {
1627 return 1;
1628 } else
1629 {
1630 return -1;
1631 }
1632 }
1633
1634 static int gdb_memory_map(struct connection *connection,
1635 struct target *target, char *packet, int packet_size)
1636 {
1637 /* We get away with only specifying flash here. Regions that are not
1638 * specified are treated as if we provided no memory map(if not we
1639 * could detect the holes and mark them as RAM).
1640 * Normally we only execute this code once, but no big deal if we
1641 * have to regenerate it a couple of times.
1642 */
1643
1644 struct flash_bank *p;
1645 char *xml = NULL;
1646 int size = 0;
1647 int pos = 0;
1648 int retval = ERROR_OK;
1649 struct flash_bank **banks;
1650 int offset;
1651 int length;
1652 char *separator;
1653 uint32_t ram_start = 0;
1654 int i;
1655
1656 /* skip command character */
1657 packet += 23;
1658
1659 offset = strtoul(packet, &separator, 16);
1660 length = strtoul(separator + 1, &separator, 16);
1661
1662 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1663
1664 /* Sort banks in ascending order. We need to report non-flash
1665 * memory as ram (or rather read/write) by default for GDB, since
1666 * it has no concept of non-cacheable read/write memory (i/o etc).
1667 *
1668 * FIXME Most non-flash addresses are *NOT* RAM! Don't lie.
1669 * Current versions of GDB assume unlisted addresses are RAM...
1670 */
1671 banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
1672
1673 for (i = 0; i < flash_get_bank_count(); i++) {
1674 p = get_flash_bank_by_num(i);
1675 if (p == NULL) {
1676 free(banks);
1677 retval = ERROR_FAIL;
1678 gdb_send_error(connection, retval);
1679 return retval;
1680 }
1681 banks[i] = p;
1682 }
1683
1684 qsort(banks, flash_get_bank_count(), sizeof(struct flash_bank *),
1685 compare_bank);
1686
1687 for (i = 0; i < flash_get_bank_count(); i++) {
1688 int j;
1689 unsigned sector_size = 0;
1690 uint32_t start, end;
1691
1692 p = banks[i];
1693 start = p->base;
1694 end = p->base + p->size;
1695
1696 if (ram_start < p->base)
1697 xml_printf(&retval, &xml, &pos, &size,
1698 "<memory type=\"ram\" start=\"0x%x\" "
1699 "length=\"0x%x\"/>\n",
1700 ram_start, p->base - ram_start);
1701
1702 /* Report adjacent groups of same-size sectors. So for
1703 * example top boot CFI flash will list an initial region
1704 * with several large sectors (maybe 128KB) and several
1705 * smaller ones at the end (maybe 32KB). STR7 will have
1706 * regions with 8KB, 32KB, and 64KB sectors; etc.
1707 */
1708 for (j = 0; j < p->num_sectors; j++) {
1709 unsigned group_len;
1710
1711 /* Maybe start a new group of sectors. */
1712 if (sector_size == 0) {
1713 start = p->base + p->sectors[j].offset;
1714 xml_printf(&retval, &xml, &pos, &size,
1715 "<memory type=\"flash\" "
1716 "start=\"0x%x\" ",
1717 start);
1718 sector_size = p->sectors[j].size;
1719 }
1720
1721 /* Does this finish a group of sectors?
1722 * If not, continue an already-started group.
1723 */
1724 if (j == p->num_sectors -1)
1725 group_len = (p->base + p->size) - start;
1726 else if (p->sectors[j + 1].size != sector_size)
1727 group_len = p->base + p->sectors[j + 1].offset
1728 - start;
1729 else
1730 continue;
1731
1732 xml_printf(&retval, &xml, &pos, &size,
1733 "length=\"0x%x\">\n"
1734 "<property name=\"blocksize\">"
1735 "0x%x</property>\n"
1736 "</memory>\n",
1737 group_len,
1738 sector_size);
1739 sector_size = 0;
1740 }
1741
1742 ram_start = p->base + p->size;
1743 }
1744
1745 if (ram_start != 0)
1746 xml_printf(&retval, &xml, &pos, &size,
1747 "<memory type=\"ram\" start=\"0x%x\" "
1748 "length=\"0x%x\"/>\n",
1749 ram_start, 0-ram_start);
1750 /* ELSE a flash chip could be at the very end of the 32 bit address
1751 * space, in which case ram_start will be precisely 0
1752 */
1753
1754 free(banks);
1755 banks = NULL;
1756
1757 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1758
1759 if (retval != ERROR_OK) {
1760 gdb_send_error(connection, retval);
1761 return retval;
1762 }
1763
1764 if (offset + length > pos)
1765 length = pos - offset;
1766
1767 char *t = malloc(length + 1);
1768 t[0] = 'l';
1769 memcpy(t + 1, xml + offset, length);
1770 gdb_put_packet(connection, t, length + 1);
1771
1772 free(t);
1773 free(xml);
1774 return ERROR_OK;
1775 }
1776
1777 static int gdb_query_packet(struct connection *connection,
1778 struct target *target, char *packet, int packet_size)
1779 {
1780 struct command_context *cmd_ctx = connection->cmd_ctx;
1781 struct gdb_connection *gdb_connection = connection->priv;
1782
1783 if (strstr(packet, "qRcmd,"))
1784 {
1785 if (packet_size > 6)
1786 {
1787 char *cmd;
1788 int i;
1789 cmd = malloc((packet_size - 6)/2 + 1);
1790 for (i = 0; i < (packet_size - 6)/2; i++)
1791 {
1792 uint32_t tmp;
1793 sscanf(packet + 6 + 2*i, "%2" SCNx32 , &tmp);
1794 cmd[i] = tmp;
1795 }
1796 cmd[(packet_size - 6)/2] = 0x0;
1797
1798 /* We want to print all debug output to GDB connection */
1799 log_add_callback(gdb_log_callback, connection);
1800 target_call_timer_callbacks_now();
1801 /* some commands need to know the GDB connection, make note of current
1802 * GDB connection. */
1803 current_gdb_connection = gdb_connection;
1804 command_run_line(cmd_ctx, cmd);
1805 current_gdb_connection = NULL;
1806 target_call_timer_callbacks_now();
1807 log_remove_callback(gdb_log_callback, connection);
1808 free(cmd);
1809 }
1810 gdb_put_packet(connection, "OK", 2);
1811 return ERROR_OK;
1812 }
1813 else if (strstr(packet, "qCRC:"))
1814 {
1815 if (packet_size > 5)
1816 {
1817 int retval;
1818 char gdb_reply[10];
1819 char *separator;
1820 uint32_t checksum;
1821 uint32_t addr = 0;
1822 uint32_t len = 0;
1823
1824 /* skip command character */
1825 packet += 5;
1826
1827 addr = strtoul(packet, &separator, 16);
1828
1829 if (*separator != ',')
1830 {
1831 LOG_ERROR("incomplete read memory packet received, dropping connection");
1832 return ERROR_SERVER_REMOTE_CLOSED;
1833 }
1834
1835 len = strtoul(separator + 1, NULL, 16);
1836
1837 retval = target_checksum_memory(target, addr, len, &checksum);
1838
1839 if (retval == ERROR_OK)
1840 {
1841 snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
1842 gdb_put_packet(connection, gdb_reply, 9);
1843 }
1844 else
1845 {
1846 if ((retval = gdb_error(connection, retval)) != ERROR_OK)
1847 return retval;
1848 }
1849
1850 return ERROR_OK;
1851 }
1852 }
1853 else if (strstr(packet, "qSupported"))
1854 {
1855 /* we currently support packet size and qXfer:memory-map:read (if enabled)
1856 * disable qXfer:features:read for the moment */
1857 int retval = ERROR_OK;
1858 char *buffer = NULL;
1859 int pos = 0;
1860 int size = 0;
1861
1862 xml_printf(&retval, &buffer, &pos, &size,
1863 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-;QStartNoAckMode+",
1864 (GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-');
1865
1866 if (retval != ERROR_OK)
1867 {
1868 gdb_send_error(connection, 01);
1869 return ERROR_OK;
1870 }
1871
1872 gdb_put_packet(connection, buffer, strlen(buffer));
1873 free(buffer);
1874
1875 return ERROR_OK;
1876 }
1877 else if (strstr(packet, "qXfer:memory-map:read::")
1878 && (flash_get_bank_count() > 0))
1879 return gdb_memory_map(connection, target, packet, packet_size);
1880 else if (strstr(packet, "qXfer:features:read:"))
1881 {
1882 char *xml = NULL;
1883 int size = 0;
1884 int pos = 0;
1885 int retval = ERROR_OK;
1886
1887 int offset;
1888 unsigned int length;
1889 char *annex;
1890
1891 /* skip command character */
1892 packet += 20;
1893
1894 if (decode_xfer_read(packet, &annex, &offset, &length) < 0)
1895 {
1896 gdb_send_error(connection, 01);
1897 return ERROR_OK;
1898 }
1899
1900 if (strcmp(annex, "target.xml") != 0)
1901 {
1902 gdb_send_error(connection, 01);
1903 return ERROR_OK;
1904 }
1905
1906 xml_printf(&retval, &xml, &pos, &size, \
1907 "l < target version=\"1.0\">\n < architecture > arm</architecture>\n</target>\n");
1908
1909 if (retval != ERROR_OK)
1910 {
1911 gdb_send_error(connection, retval);
1912 return retval;
1913 }
1914
1915 gdb_put_packet(connection, xml, strlen(xml));
1916
1917 free(xml);
1918 return ERROR_OK;
1919 }
1920 else if (strstr(packet, "QStartNoAckMode"))
1921 {
1922 gdb_connection->noack_mode = 1;
1923 gdb_put_packet(connection, "OK", 2);
1924 return ERROR_OK;
1925 }
1926
1927 gdb_put_packet(connection, "", 0);
1928 return ERROR_OK;
1929 }
1930
1931 static int gdb_v_packet(struct connection *connection,
1932 struct target *target, char *packet, int packet_size)
1933 {
1934 struct gdb_connection *gdb_connection = connection->priv;
1935 struct gdb_service *gdb_service = connection->service->priv;
1936 int result;
1937
1938 /* if flash programming disabled - send a empty reply */
1939
1940 if (gdb_flash_program == 0)
1941 {
1942 gdb_put_packet(connection, "", 0);
1943 return ERROR_OK;
1944 }
1945
1946 if (strstr(packet, "vFlashErase:"))
1947 {
1948 unsigned long addr;
1949 unsigned long length;
1950
1951 char *parse = packet + 12;
1952 if (*parse == '\0')
1953 {
1954 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1955 return ERROR_SERVER_REMOTE_CLOSED;
1956 }
1957
1958 addr = strtoul(parse, &parse, 16);
1959
1960 if (*(parse++) != ',' || *parse == '\0')
1961 {
1962 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1963 return ERROR_SERVER_REMOTE_CLOSED;
1964 }
1965
1966 length = strtoul(parse, &parse, 16);
1967
1968 if (*parse != '\0')
1969 {
1970 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
1971 return ERROR_SERVER_REMOTE_CLOSED;
1972 }
1973
1974 /* assume all sectors need erasing - stops any problems
1975 * when flash_write is called multiple times */
1976 flash_set_dirty();
1977
1978 /* perform any target specific operations before the erase */
1979 target_call_event_callbacks(gdb_service->target,
1980 TARGET_EVENT_GDB_FLASH_ERASE_START);
1981
1982 /* vFlashErase:addr,length messages require region start and
1983 * end to be "block" aligned ... if padding is ever needed,
1984 * GDB will have become dangerously confused.
1985 */
1986 result = flash_erase_address_range(gdb_service->target,
1987 false, addr, length);
1988
1989 /* perform any target specific operations after the erase */
1990 target_call_event_callbacks(gdb_service->target,
1991 TARGET_EVENT_GDB_FLASH_ERASE_END);
1992
1993 /* perform erase */
1994 if (result != ERROR_OK)
1995 {
1996 /* GDB doesn't evaluate the actual error number returned,
1997 * treat a failed erase as an I/O error
1998 */
1999 gdb_send_error(connection, EIO);
2000 LOG_ERROR("flash_erase returned %i", result);
2001 }
2002 else
2003 gdb_put_packet(connection, "OK", 2);
2004
2005 return ERROR_OK;
2006 }
2007
2008 if (strstr(packet, "vFlashWrite:"))
2009 {
2010 int retval;
2011 unsigned long addr;
2012 unsigned long length;
2013 char *parse = packet + 12;
2014
2015 if (*parse == '\0')
2016 {
2017 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2018 return ERROR_SERVER_REMOTE_CLOSED;
2019 }
2020 addr = strtoul(parse, &parse, 16);
2021 if (*(parse++) != ':')
2022 {
2023 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2024 return ERROR_SERVER_REMOTE_CLOSED;
2025 }
2026 length = packet_size - (parse - packet);
2027
2028 /* create a new image if there isn't already one */
2029 if (gdb_connection->vflash_image == NULL)
2030 {
2031 gdb_connection->vflash_image = malloc(sizeof(struct image));
2032 image_open(gdb_connection->vflash_image, "", "build");
2033 }
2034
2035 /* create new section with content from packet buffer */
2036 if ((retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (uint8_t*)parse)) != ERROR_OK)
2037 {
2038 return retval;
2039 }
2040
2041 gdb_put_packet(connection, "OK", 2);
2042
2043 return ERROR_OK;
2044 }
2045
2046 if (!strcmp(packet, "vFlashDone"))
2047 {
2048 uint32_t written;
2049
2050 /* process the flashing buffer. No need to erase as GDB
2051 * always issues a vFlashErase first. */
2052 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_START);
2053 result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
2054 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
2055 if (result != ERROR_OK)
2056 {
2057 if (result == ERROR_FLASH_DST_OUT_OF_BANK)
2058 gdb_put_packet(connection, "E.memtype", 9);
2059 else
2060 gdb_send_error(connection, EIO);
2061 }
2062 else
2063 {
2064 LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
2065 gdb_put_packet(connection, "OK", 2);
2066 }
2067
2068 image_close(gdb_connection->vflash_image);
2069 free(gdb_connection->vflash_image);
2070 gdb_connection->vflash_image = NULL;
2071
2072 return ERROR_OK;
2073 }
2074
2075 gdb_put_packet(connection, "", 0);
2076 return ERROR_OK;
2077 }
2078
2079 static int gdb_detach(struct connection *connection, struct target *target)
2080 {
2081 struct gdb_service *gdb_service = connection->service->priv;
2082
2083 target_call_event_callbacks(gdb_service->target,
2084 TARGET_EVENT_GDB_DETACH);
2085
2086 return gdb_put_packet(connection, "OK", 2);
2087 }
2088
2089 static void gdb_log_callback(void *priv, const char *file, unsigned line,
2090 const char *function, const char *string)
2091 {
2092 struct connection *connection = priv;
2093 struct gdb_connection *gdb_con = connection->priv;
2094
2095 if (gdb_con->busy)
2096 {
2097 /* do not reply this using the O packet */
2098 return;
2099 }
2100
2101 gdb_output_con(connection, string);
2102 }
2103
2104 static void gdb_sig_halted(struct connection *connection)
2105 {
2106 char sig_reply[4];
2107 snprintf(sig_reply, 4, "T%2.2x", 2);
2108 gdb_put_packet(connection, sig_reply, 3);
2109
2110 }
2111
2112 static int gdb_input_inner(struct connection *connection)
2113 {
2114 /* Do not allocate this on the stack */
2115 static char gdb_packet_buffer[GDB_BUFFER_SIZE];
2116
2117 struct gdb_service *gdb_service = connection->service->priv;
2118 struct target *target = gdb_service->target;
2119 char *packet = gdb_packet_buffer;
2120 int packet_size;
2121 int retval;
2122 struct gdb_connection *gdb_con = connection->priv;
2123 static int extended_protocol = 0;
2124
2125 /* drain input buffer */
2126 do
2127 {
2128 packet_size = GDB_BUFFER_SIZE-1;
2129 retval = gdb_get_packet(connection, packet, &packet_size);
2130 if (retval != ERROR_OK)
2131 return retval;
2132
2133 /* terminate with zero */
2134 packet[packet_size] = 0;
2135
2136 if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
2137 if (packet[0] == 'X') {
2138 // binary packets spew junk into the debug log stream
2139 char buf[ 50 ];
2140 int x;
2141 for (x = 0 ; (x < 49) && (packet[x] != ':') ; x++) {
2142 buf[x] = packet[x];
2143 }
2144 buf[x] = 0;
2145 LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
2146 } else {
2147 LOG_DEBUG("received packet: '%s'", packet);
2148 }
2149 }
2150
2151 if (packet_size > 0)
2152 {
2153 retval = ERROR_OK;
2154 switch (packet[0])
2155 {
2156 case 'H':
2157 /* Hct... -- set thread
2158 * we don't have threads, send empty reply */
2159 gdb_put_packet(connection, NULL, 0);
2160 break;
2161 case 'q':
2162 case 'Q':
2163 retval = gdb_query_packet(connection,
2164 target, packet,
2165 packet_size);
2166 break;
2167 case 'g':
2168 retval = gdb_get_registers_packet(
2169 connection, target,
2170 packet, packet_size);
2171 break;
2172 case 'G':
2173 retval = gdb_set_registers_packet(
2174 connection, target,
2175 packet, packet_size);
2176 break;
2177 case 'p':
2178 retval = gdb_get_register_packet(
2179 connection, target,
2180 packet, packet_size);
2181 break;
2182 case 'P':
2183 retval = gdb_set_register_packet(
2184 connection, target,
2185 packet, packet_size);
2186 break;
2187 case 'm':
2188 retval = gdb_read_memory_packet(
2189 connection, target,
2190 packet, packet_size);
2191 break;
2192 case 'M':
2193 retval = gdb_write_memory_packet(
2194 connection, target,
2195 packet, packet_size);
2196 break;
2197 case 'z':
2198 case 'Z':
2199 retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
2200 break;
2201 case '?':
2202 gdb_last_signal_packet(
2203 connection, target,
2204 packet, packet_size);
2205 break;
2206 case 'c':
2207 case 's':
2208 {
2209 int retval = ERROR_OK;
2210
2211 struct gdb_connection *gdb_con = connection->priv;
2212 log_add_callback(gdb_log_callback, connection);
2213
2214 bool nostep = false;
2215 bool already_running = false;
2216 if (target->state == TARGET_RUNNING)
2217 {
2218 LOG_WARNING("WARNING! The target is already running. "
2219 "All changes GDB did to registers will be discarded! "
2220 "Waiting for target to halt.");
2221 already_running = true;
2222 } else if (target->state != TARGET_HALTED)
2223 {
2224 LOG_WARNING("The target is not in the halted nor running stated, stepi/continue ignored.");
2225 nostep = true;
2226 } else if ((packet[0] == 's') && gdb_con->sync)
2227 {
2228 /* Hmm..... when you issue a continue in GDB, then a "stepi" is
2229 * sent by GDB first to OpenOCD, thus defeating the check to
2230 * make only the single stepping have the sync feature...
2231 */
2232 nostep = true;
2233 LOG_WARNING("stepi ignored. GDB will now fetch the register state from the target.");
2234 }
2235 gdb_con->sync = false;
2236
2237 if ((retval!=ERROR_OK) || (!already_running && nostep))
2238 {
2239 /* Either the target isn't in the halted state, then we can't
2240 * step/continue. This might be early setup, etc.
2241 *
2242 * Or we want to allow GDB to pick up a fresh set of
2243 * register values without modifying the target state.
2244 *
2245 */
2246 gdb_sig_halted(connection);
2247
2248 /* stop forwarding log packets! */
2249 log_remove_callback(gdb_log_callback, connection);
2250 } else
2251 {
2252 /* We're running/stepping, in which case we can
2253 * forward log output until the target is halted
2254 */
2255 gdb_con->frontend_state = TARGET_RUNNING;
2256 target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
2257
2258 if (!already_running)
2259 {
2260 int retval = gdb_step_continue_packet(connection, target, packet, packet_size);
2261 if (retval != ERROR_OK)
2262 {
2263 /* we'll never receive a halted condition... issue a false one.. */
2264 gdb_frontend_halted(target, connection);
2265 }
2266 }
2267 }
2268 }
2269 break;
2270 case 'v':
2271 retval = gdb_v_packet(
2272 connection, target,
2273 packet, packet_size);
2274 break;
2275 case 'D':
2276 retval = gdb_detach(connection, target);
2277 extended_protocol = 0;
2278 break;
2279 case 'X':
2280 retval = gdb_write_memory_binary_packet(
2281 connection, target,
2282 packet, packet_size);
2283 if (retval != ERROR_OK)
2284 return retval;
2285 break;
2286 case 'k':
2287 if (extended_protocol != 0)
2288 break;
2289 gdb_put_packet(connection, "OK", 2);
2290 return ERROR_SERVER_REMOTE_CLOSED;
2291 case '!':
2292 /* handle extended remote protocol */
2293 extended_protocol = 1;
2294 gdb_put_packet(connection, "OK", 2);
2295 break;
2296 case 'R':
2297 /* handle extended restart packet */
2298 breakpoint_clear_target(gdb_service->target);
2299 watchpoint_clear_target(gdb_service->target);
2300 command_run_linef(connection->cmd_ctx,
2301 "ocd_gdb_restart %s",
2302 target_name(target));
2303 break;
2304 default:
2305 /* ignore unknown packets */
2306 LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
2307 gdb_put_packet(connection, NULL, 0);
2308 break;
2309 }
2310
2311 /* if a packet handler returned an error, exit input loop */
2312 if (retval != ERROR_OK)
2313 return retval;
2314 }
2315
2316 if (gdb_con->ctrl_c)
2317 {
2318 if (target->state == TARGET_RUNNING)
2319 {
2320 retval = target_halt(target);
2321 if (retval != ERROR_OK)
2322 {
2323 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2324 }
2325 gdb_con->ctrl_c = 0;
2326 } else
2327 {
2328 LOG_INFO("The target is not running when halt was requested, stopping GDB.");
2329 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2330 }
2331 }
2332
2333 } while (gdb_con->buf_cnt > 0);
2334
2335 return ERROR_OK;
2336 }
2337
2338 static int gdb_input(struct connection *connection)
2339 {
2340 int retval = gdb_input_inner(connection);
2341 struct gdb_connection *gdb_con = connection->priv;
2342 if (retval == ERROR_SERVER_REMOTE_CLOSED)
2343 return retval;
2344
2345 /* logging does not propagate the error, yet can set the gdb_con->closed flag */
2346 if (gdb_con->closed)
2347 return ERROR_SERVER_REMOTE_CLOSED;
2348
2349 /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
2350 return ERROR_OK;
2351 }
2352
2353 static int gdb_target_start(struct target *target, uint16_t port)
2354 {
2355 bool use_pipes = 0 == port;
2356 struct gdb_service *gdb_service = malloc(sizeof(struct gdb_service));
2357 if (NULL == gdb_service)
2358 return -ENOMEM;
2359
2360 gdb_service->target = target;
2361
2362 add_service("gdb", use_pipes ? CONNECTION_PIPE : CONNECTION_TCP,
2363 port, 1, &gdb_new_connection, &gdb_input,
2364 &gdb_connection_closed, gdb_service);
2365
2366 const char *name = target_name(target);
2367 if (use_pipes)
2368 LOG_DEBUG("gdb service for target '%s' using pipes", name);
2369 else
2370 LOG_DEBUG("gdb service for target '%s' on TCP port %u", name, port);
2371 return ERROR_OK;
2372 }
2373
2374 static int gdb_target_add_one(struct target *target)
2375 {
2376 if (gdb_port == 0 && server_use_pipes == 0)
2377 {
2378 LOG_INFO("gdb port disabled");
2379 return ERROR_OK;
2380 }
2381 if (0 == gdb_port_next)
2382 gdb_port_next = gdb_port;
2383
2384 bool use_pipes = server_use_pipes;
2385 static bool server_started_with_pipes = false;
2386 if (server_started_with_pipes)
2387 {
2388 LOG_WARNING("gdb service permits one target when using pipes");
2389 if (0 == gdb_port)
2390 return ERROR_OK;
2391
2392 use_pipes = false;
2393 }
2394
2395 int e = gdb_target_start(target, use_pipes ? 0 : gdb_port_next);
2396 if (ERROR_OK == e)
2397 {
2398 server_started_with_pipes |= use_pipes;
2399 gdb_port_next++;
2400 }
2401 return e;
2402 }
2403
2404 int gdb_target_add_all(struct target *target)
2405 {
2406 if (NULL == target)
2407 {
2408 LOG_WARNING("gdb services need one or more targets defined");
2409 return ERROR_OK;
2410 }
2411
2412 while (NULL != target)
2413 {
2414 int retval = gdb_target_add_one(target);
2415 if (ERROR_OK != retval)
2416 return retval;
2417
2418 target = target->next;
2419 }
2420
2421 return ERROR_OK;
2422 }
2423
2424 COMMAND_HANDLER(handle_gdb_sync_command)
2425 {
2426 if (CMD_ARGC != 0)
2427 {
2428 return ERROR_COMMAND_SYNTAX_ERROR;
2429 }
2430
2431 if (current_gdb_connection == NULL)
2432 {
2433 command_print(CMD_CTX,
2434 "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
2435 return ERROR_FAIL;
2436 }
2437
2438 current_gdb_connection->sync = true;
2439
2440 return ERROR_OK;
2441 }
2442
2443 /* daemon configuration command gdb_port */
2444 COMMAND_HANDLER(handle_gdb_port_command)
2445 {
2446 int retval = CALL_COMMAND_HANDLER(server_port_command, &gdb_port);
2447 if (ERROR_OK == retval)
2448 gdb_port_next = gdb_port;
2449 return retval;
2450 }
2451
2452 COMMAND_HANDLER(handle_gdb_memory_map_command)
2453 {
2454 if (CMD_ARGC == 1)
2455 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map);
2456
2457 return ERROR_COMMAND_SYNTAX_ERROR;
2458 }
2459
2460 COMMAND_HANDLER(handle_gdb_flash_program_command)
2461 {
2462 if (CMD_ARGC == 1)
2463 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program);
2464
2465 return ERROR_COMMAND_SYNTAX_ERROR;
2466 }
2467
2468 COMMAND_HANDLER(handle_gdb_report_data_abort_command)
2469 {
2470 if (CMD_ARGC == 1)
2471 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort);
2472
2473 return ERROR_COMMAND_SYNTAX_ERROR;
2474 }
2475
2476 /* gdb_breakpoint_override */
2477 COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
2478 {
2479 if (CMD_ARGC == 0)
2480 {
2481
2482 } else if (CMD_ARGC == 1)
2483 {
2484 gdb_breakpoint_override = 1;
2485 if (strcmp(CMD_ARGV[0], "hard") == 0)
2486 {
2487 gdb_breakpoint_override_type = BKPT_HARD;
2488 } else if (strcmp(CMD_ARGV[0], "soft") == 0)
2489 {
2490 gdb_breakpoint_override_type = BKPT_SOFT;
2491 } else if (strcmp(CMD_ARGV[0], "disable") == 0)
2492 {
2493 gdb_breakpoint_override = 0;
2494 }
2495 } else
2496 {
2497 return ERROR_COMMAND_SYNTAX_ERROR;
2498 }
2499 if (gdb_breakpoint_override)
2500 {
2501 LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type == BKPT_HARD)?"hard":"soft");
2502 } else
2503 {
2504 LOG_USER("breakpoint type is not overridden");
2505 }
2506
2507 return ERROR_OK;
2508 }
2509
2510 static const struct command_registration gdb_command_handlers[] = {
2511 {
2512 .name = "gdb_sync",
2513 .handler = handle_gdb_sync_command,
2514 .mode = COMMAND_ANY,
2515 .help = "next stepi will return immediately allowing "
2516 "GDB to fetch register state without affecting "
2517 "target state",
2518 },
2519 {
2520 .name = "gdb_port",
2521 .handler = handle_gdb_port_command,
2522 .mode = COMMAND_ANY,
2523 .help = "Display or specify base port on which to listen "
2524 "for incoming GDB connections. "
2525 "No arguments reports GDB port; zero disables.",
2526 .usage = "[port_num]",
2527 },
2528 {
2529 .name = "gdb_memory_map",
2530 .handler = handle_gdb_memory_map_command,
2531 .mode = COMMAND_CONFIG,
2532 .help = "enable or disable memory map",
2533 .usage = "('enable'|'disable')"
2534 },
2535 {
2536 .name = "gdb_flash_program",
2537 .handler = handle_gdb_flash_program_command,
2538 .mode = COMMAND_CONFIG,
2539 .help = "enable or disable flash program",
2540 .usage = "('enable'|'disable')"
2541 },
2542 {
2543 .name = "gdb_report_data_abort",
2544 .handler = handle_gdb_report_data_abort_command,
2545 .mode = COMMAND_CONFIG,
2546 .help = "enable or disable reporting data aborts",
2547 .usage = "('enable'|'disable')"
2548 },
2549 {
2550 .name = "gdb_breakpoint_override",
2551 .handler = handle_gdb_breakpoint_override_command,
2552 .mode = COMMAND_ANY,
2553 .help = "Display or specify type of breakpoint "
2554 "to be used by gdb 'break' commands.",
2555 .usage = "('hard'|'soft'|'disable')"
2556 },
2557 COMMAND_REGISTRATION_DONE
2558 };
2559
2560 int gdb_register_commands(struct command_context *cmd_ctx)
2561 {
2562 return register_commands(cmd_ctx, NULL, gdb_command_handlers);
2563 }
Marex's Cortex A8 development branch