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gdb: enable target description support by default
[openocd.git] / src / server / gdb_server.c
bloba930ec4106b845603b722afcafa1012769fc3c6f
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007-2010 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
10 * *
11 * Copyright (C) 2011 by Broadcom Corporation *
12 * Evan Hunter - ehunter@broadcom.com *
13 * *
14 * Copyright (C) ST-Ericsson SA 2011 *
15 * michel.jaouen@stericsson.com : smp minimum support *
16 * *
17 * Copyright (C) 2013 Andes Technology *
18 * Hsiangkai Wang <hkwang@andestech.com> *
19 * *
20 * Copyright (C) 2013 Franck Jullien *
21 * elec4fun@gmail.com *
22 * *
23 * This program is free software; you can redistribute it and/or modify *
24 * it under the terms of the GNU General Public License as published by *
25 * the Free Software Foundation; either version 2 of the License, or *
26 * (at your option) any later version. *
27 * *
28 * This program is distributed in the hope that it will be useful, *
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
31 * GNU General Public License for more details. *
32 * *
33 * You should have received a copy of the GNU General Public License *
34 * along with this program; if not, write to the *
35 * Free Software Foundation, Inc., *
36 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
37 ***************************************************************************/
38
39 #ifdef HAVE_CONFIG_H
40 #include "config.h"
41 #endif
42
43 #include <target/breakpoints.h>
44 #include <target/target_request.h>
45 #include <target/register.h>
46 #include "server.h"
47 #include <flash/nor/core.h>
48 #include "gdb_server.h"
49 #include <target/image.h>
50 #include <jtag/jtag.h>
51 #include "rtos/rtos.h"
52 #include "target/smp.h"
53
54 /**
55 * @file
56 * GDB server implementation.
57 *
58 * This implements the GDB Remote Serial Protocol, over TCP connections,
59 * giving GDB access to the JTAG or other hardware debugging facilities
60 * found in most modern embedded processors.
61 */
62
63 /* private connection data for GDB */
64 struct gdb_connection {
65 char buffer[GDB_BUFFER_SIZE];
66 char *buf_p;
67 int buf_cnt;
68 int ctrl_c;
69 enum target_state frontend_state;
70 struct image *vflash_image;
71 int closed;
72 int busy;
73 int noack_mode;
74 /* set flag to true if you want the next stepi to return immediately.
75 * allowing GDB to pick up a fresh set of register values from the target
76 * without modifying the target state. */
77 bool sync;
78 /* We delay reporting memory write errors until next step/continue or memory
79 * write. This improves performance of gdb load significantly as the GDB packet
80 * can be replied immediately and a new GDB packet will be ready without delay
81 * (ca. 10% or so...). */
82 bool mem_write_error;
83 /* with extended-remote it seems we need to better emulate attach/detach.
84 * what this means is we reply with a W stop reply after a kill packet,
85 * normally we reply with a S reply via gdb_last_signal_packet.
86 * as a side note this behaviour only effects gdb > 6.8 */
87 bool attached;
88 };
89
90 #if 0
91 #define _DEBUG_GDB_IO_
92 #endif
93
94 static struct gdb_connection *current_gdb_connection;
95
96 static int gdb_breakpoint_override;
97 static enum breakpoint_type gdb_breakpoint_override_type;
98
99 static int gdb_error(struct connection *connection, int retval);
100 static const char *gdb_port;
101 static const char *gdb_port_next;
102
103 static void gdb_log_callback(void *priv, const char *file, unsigned line,
104 const char *function, const char *string);
105
106 /* number of gdb connections, mainly to suppress gdb related debugging spam
107 * in helper/log.c when no gdb connections are actually active */
108 int gdb_actual_connections;
109
110 /* set if we are sending a memory map to gdb
111 * via qXfer:memory-map:read packet */
112 /* enabled by default*/
113 static int gdb_use_memory_map = 1;
114 /* enabled by default*/
115 static int gdb_flash_program = 1;
116
117 /* if set, data aborts cause an error to be reported in memory read packets
118 * see the code in gdb_read_memory_packet() for further explanations.
119 * Disabled by default.
120 */
121 static int gdb_report_data_abort;
122
123 /* set if we are sending target descriptions to gdb
124 * via qXfer:features:read packet */
125 /* enabled by default */
126 static int gdb_use_target_description = 1;
127
128 /* current processing free-run type, used by file-I/O */
129 static char gdb_running_type;
130
131 static int gdb_last_signal(struct target *target)
132 {
133 switch (target->debug_reason) {
134 case DBG_REASON_DBGRQ:
135 return 0x2; /* SIGINT */
136 case DBG_REASON_BREAKPOINT:
137 case DBG_REASON_WATCHPOINT:
138 case DBG_REASON_WPTANDBKPT:
139 return 0x05; /* SIGTRAP */
140 case DBG_REASON_SINGLESTEP:
141 return 0x05; /* SIGTRAP */
142 case DBG_REASON_NOTHALTED:
143 return 0x0; /* no signal... shouldn't happen */
144 default:
145 LOG_USER("undefined debug reason %d - target needs reset",
146 target->debug_reason);
147 return 0x0;
148 }
149 }
150
151 static int check_pending(struct connection *connection,
152 int timeout_s, int *got_data)
153 {
154 /* a non-blocking socket will block if there is 0 bytes available on the socket,
155 * but return with as many bytes as are available immediately
156 */
157 struct timeval tv;
158 fd_set read_fds;
159 struct gdb_connection *gdb_con = connection->priv;
160 int t;
161 if (got_data == NULL)
162 got_data = &t;
163 *got_data = 0;
164
165 if (gdb_con->buf_cnt > 0) {
166 *got_data = 1;
167 return ERROR_OK;
168 }
169
170 FD_ZERO(&read_fds);
171 FD_SET(connection->fd, &read_fds);
172
173 tv.tv_sec = timeout_s;
174 tv.tv_usec = 0;
175 if (socket_select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0) {
176 /* This can typically be because a "monitor" command took too long
177 * before printing any progress messages
178 */
179 if (timeout_s > 0)
180 return ERROR_GDB_TIMEOUT;
181 else
182 return ERROR_OK;
183 }
184 *got_data = FD_ISSET(connection->fd, &read_fds) != 0;
185 return ERROR_OK;
186 }
187
188 static int gdb_get_char_inner(struct connection *connection, int *next_char)
189 {
190 struct gdb_connection *gdb_con = connection->priv;
191 int retval = ERROR_OK;
192
193 #ifdef _DEBUG_GDB_IO_
194 char *debug_buffer;
195 #endif
196 for (;; ) {
197 if (connection->service->type != CONNECTION_TCP)
198 gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
199 else {
200 retval = check_pending(connection, 1, NULL);
201 if (retval != ERROR_OK)
202 return retval;
203 gdb_con->buf_cnt = read_socket(connection->fd,
204 gdb_con->buffer,
205 GDB_BUFFER_SIZE);
206 }
207
208 if (gdb_con->buf_cnt > 0)
209 break;
210 if (gdb_con->buf_cnt == 0) {
211 gdb_con->closed = 1;
212 return ERROR_SERVER_REMOTE_CLOSED;
213 }
214
215 #ifdef _WIN32
216 errno = WSAGetLastError();
217
218 switch (errno) {
219 case WSAEWOULDBLOCK:
220 usleep(1000);
221 break;
222 case WSAECONNABORTED:
223 gdb_con->closed = 1;
224 return ERROR_SERVER_REMOTE_CLOSED;
225 case WSAECONNRESET:
226 gdb_con->closed = 1;
227 return ERROR_SERVER_REMOTE_CLOSED;
228 default:
229 LOG_ERROR("read: %d", errno);
230 exit(-1);
231 }
232 #else
233 switch (errno) {
234 case EAGAIN:
235 usleep(1000);
236 break;
237 case ECONNABORTED:
238 gdb_con->closed = 1;
239 return ERROR_SERVER_REMOTE_CLOSED;
240 case ECONNRESET:
241 gdb_con->closed = 1;
242 return ERROR_SERVER_REMOTE_CLOSED;
243 default:
244 LOG_ERROR("read: %s", strerror(errno));
245 gdb_con->closed = 1;
246 return ERROR_SERVER_REMOTE_CLOSED;
247 }
248 #endif
249 }
250
251 #ifdef _DEBUG_GDB_IO_
252 debug_buffer = strndup(gdb_con->buffer, gdb_con->buf_cnt);
253 LOG_DEBUG("received '%s'", debug_buffer);
254 free(debug_buffer);
255 #endif
256
257 gdb_con->buf_p = gdb_con->buffer;
258 gdb_con->buf_cnt--;
259 *next_char = *(gdb_con->buf_p++);
260 if (gdb_con->buf_cnt > 0)
261 connection->input_pending = 1;
262 else
263 connection->input_pending = 0;
264 #ifdef _DEBUG_GDB_IO_
265 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
266 #endif
267
268 return retval;
269 }
270
271 /**
272 * The cool thing about this fn is that it allows buf_p and buf_cnt to be
273 * held in registers in the inner loop.
274 *
275 * For small caches and embedded systems this is important!
276 */
277 static inline int gdb_get_char_fast(struct connection *connection,
278 int *next_char, char **buf_p, int *buf_cnt)
279 {
280 int retval = ERROR_OK;
281
282 if ((*buf_cnt)-- > 0) {
283 *next_char = **buf_p;
284 (*buf_p)++;
285 if (*buf_cnt > 0)
286 connection->input_pending = 1;
287 else
288 connection->input_pending = 0;
289
290 #ifdef _DEBUG_GDB_IO_
291 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
292 #endif
293
294 return ERROR_OK;
295 }
296
297 struct gdb_connection *gdb_con = connection->priv;
298 gdb_con->buf_p = *buf_p;
299 gdb_con->buf_cnt = *buf_cnt;
300 retval = gdb_get_char_inner(connection, next_char);
301 *buf_p = gdb_con->buf_p;
302 *buf_cnt = gdb_con->buf_cnt;
303
304 return retval;
305 }
306
307 static int gdb_get_char(struct connection *connection, int *next_char)
308 {
309 struct gdb_connection *gdb_con = connection->priv;
310 return gdb_get_char_fast(connection, next_char, &gdb_con->buf_p, &gdb_con->buf_cnt);
311 }
312
313 static int gdb_putback_char(struct connection *connection, int last_char)
314 {
315 struct gdb_connection *gdb_con = connection->priv;
316
317 if (gdb_con->buf_p > gdb_con->buffer) {
318 *(--gdb_con->buf_p) = last_char;
319 gdb_con->buf_cnt++;
320 } else
321 LOG_ERROR("BUG: couldn't put character back");
322
323 return ERROR_OK;
324 }
325
326 /* The only way we can detect that the socket is closed is the first time
327 * we write to it, we will fail. Subsequent write operations will
328 * succeed. Shudder! */
329 static int gdb_write(struct connection *connection, void *data, int len)
330 {
331 struct gdb_connection *gdb_con = connection->priv;
332 if (gdb_con->closed)
333 return ERROR_SERVER_REMOTE_CLOSED;
334
335 if (connection_write(connection, data, len) == len)
336 return ERROR_OK;
337 gdb_con->closed = 1;
338 return ERROR_SERVER_REMOTE_CLOSED;
339 }
340
341 static int gdb_put_packet_inner(struct connection *connection,
342 char *buffer, int len)
343 {
344 int i;
345 unsigned char my_checksum = 0;
346 #ifdef _DEBUG_GDB_IO_
347 char *debug_buffer;
348 #endif
349 int reply;
350 int retval;
351 struct gdb_connection *gdb_con = connection->priv;
352
353 for (i = 0; i < len; i++)
354 my_checksum += buffer[i];
355
356 #ifdef _DEBUG_GDB_IO_
357 /*
358 * At this point we should have nothing in the input queue from GDB,
359 * however sometimes '-' is sent even though we've already received
360 * an ACK (+) for everything we've sent off.
361 */
362 int gotdata;
363 for (;; ) {
364 retval = check_pending(connection, 0, &gotdata);
365 if (retval != ERROR_OK)
366 return retval;
367 if (!gotdata)
368 break;
369 retval = gdb_get_char(connection, &reply);
370 if (retval != ERROR_OK)
371 return retval;
372 if (reply == '$') {
373 /* fix a problem with some IAR tools */
374 gdb_putback_char(connection, reply);
375 LOG_DEBUG("Unexpected start of new packet");
376 break;
377 }
378
379 LOG_WARNING("Discard unexpected char %c", reply);
380 }
381 #endif
382
383 while (1) {
384 #ifdef _DEBUG_GDB_IO_
385 debug_buffer = strndup(buffer, len);
386 LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
387 free(debug_buffer);
388 #endif
389
390 char local_buffer[1024];
391 local_buffer[0] = '$';
392 if ((size_t)len + 4 <= sizeof(local_buffer)) {
393 /* performance gain on smaller packets by only a single call to gdb_write() */
394 memcpy(local_buffer + 1, buffer, len++);
395 len += snprintf(local_buffer + len, sizeof(local_buffer) - len, "#%02x", my_checksum);
396 retval = gdb_write(connection, local_buffer, len);
397 if (retval != ERROR_OK)
398 return retval;
399 } else {
400 /* larger packets are transmitted directly from caller supplied buffer
401 * by several calls to gdb_write() to avoid dynamic allocation */
402 snprintf(local_buffer + 1, sizeof(local_buffer) - 1, "#%02x", my_checksum);
403 retval = gdb_write(connection, local_buffer, 1);
404 if (retval != ERROR_OK)
405 return retval;
406 retval = gdb_write(connection, buffer, len);
407 if (retval != ERROR_OK)
408 return retval;
409 retval = gdb_write(connection, local_buffer + 1, 3);
410 if (retval != ERROR_OK)
411 return retval;
412 }
413
414 if (gdb_con->noack_mode)
415 break;
416
417 retval = gdb_get_char(connection, &reply);
418 if (retval != ERROR_OK)
419 return retval;
420
421 if (reply == '+')
422 break;
423 else if (reply == '-') {
424 /* Stop sending output packets for now */
425 log_remove_callback(gdb_log_callback, connection);
426 LOG_WARNING("negative reply, retrying");
427 } else if (reply == 0x3) {
428 gdb_con->ctrl_c = 1;
429 retval = gdb_get_char(connection, &reply);
430 if (retval != ERROR_OK)
431 return retval;
432 if (reply == '+')
433 break;
434 else if (reply == '-') {
435 /* Stop sending output packets for now */
436 log_remove_callback(gdb_log_callback, connection);
437 LOG_WARNING("negative reply, retrying");
438 } else if (reply == '$') {
439 LOG_ERROR("GDB missing ack(1) - assumed good");
440 gdb_putback_char(connection, reply);
441 return ERROR_OK;
442 } else {
443 LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
444 gdb_con->closed = 1;
445 return ERROR_SERVER_REMOTE_CLOSED;
446 }
447 } else if (reply == '$') {
448 LOG_ERROR("GDB missing ack(2) - assumed good");
449 gdb_putback_char(connection, reply);
450 return ERROR_OK;
451 } else {
452 LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection",
453 reply);
454 gdb_con->closed = 1;
455 return ERROR_SERVER_REMOTE_CLOSED;
456 }
457 }
458 if (gdb_con->closed)
459 return ERROR_SERVER_REMOTE_CLOSED;
460
461 return ERROR_OK;
462 }
463
464 int gdb_put_packet(struct connection *connection, char *buffer, int len)
465 {
466 struct gdb_connection *gdb_con = connection->priv;
467 gdb_con->busy = 1;
468 int retval = gdb_put_packet_inner(connection, buffer, len);
469 gdb_con->busy = 0;
470
471 /* we sent some data, reset timer for keep alive messages */
472 kept_alive();
473
474 return retval;
475 }
476
477 static inline int fetch_packet(struct connection *connection,
478 int *checksum_ok, int noack, int *len, char *buffer)
479 {
480 unsigned char my_checksum = 0;
481 char checksum[3];
482 int character;
483 int retval = ERROR_OK;
484
485 struct gdb_connection *gdb_con = connection->priv;
486 my_checksum = 0;
487 int count = 0;
488 count = 0;
489
490 /* move this over into local variables to use registers and give the
491 * more freedom to optimize */
492 char *buf_p = gdb_con->buf_p;
493 int buf_cnt = gdb_con->buf_cnt;
494
495 for (;; ) {
496 /* The common case is that we have an entire packet with no escape chars.
497 * We need to leave at least 2 bytes in the buffer to have
498 * gdb_get_char() update various bits and bobs correctly.
499 */
500 if ((buf_cnt > 2) && ((buf_cnt + count) < *len)) {
501 /* The compiler will struggle a bit with constant propagation and
502 * aliasing, so we help it by showing that these values do not
503 * change inside the loop
504 */
505 int i;
506 char *buf = buf_p;
507 int run = buf_cnt - 2;
508 i = 0;
509 int done = 0;
510 while (i < run) {
511 character = *buf++;
512 i++;
513 if (character == '#') {
514 /* Danger! character can be '#' when esc is
515 * used so we need an explicit boolean for done here. */
516 done = 1;
517 break;
518 }
519
520 if (character == '}') {
521 /* data transmitted in binary mode (X packet)
522 * uses 0x7d as escape character */
523 my_checksum += character & 0xff;
524 character = *buf++;
525 i++;
526 my_checksum += character & 0xff;
527 buffer[count++] = (character ^ 0x20) & 0xff;
528 } else {
529 my_checksum += character & 0xff;
530 buffer[count++] = character & 0xff;
531 }
532 }
533 buf_p += i;
534 buf_cnt -= i;
535 if (done)
536 break;
537 }
538 if (count > *len) {
539 LOG_ERROR("packet buffer too small");
540 retval = ERROR_GDB_BUFFER_TOO_SMALL;
541 break;
542 }
543
544 retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt);
545 if (retval != ERROR_OK)
546 break;
547
548 if (character == '#')
549 break;
550
551 if (character == '}') {
552 /* data transmitted in binary mode (X packet)
553 * uses 0x7d as escape character */
554 my_checksum += character & 0xff;
555
556 retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt);
557 if (retval != ERROR_OK)
558 break;
559
560 my_checksum += character & 0xff;
561 buffer[count++] = (character ^ 0x20) & 0xff;
562 } else {
563 my_checksum += character & 0xff;
564 buffer[count++] = character & 0xff;
565 }
566 }
567
568 gdb_con->buf_p = buf_p;
569 gdb_con->buf_cnt = buf_cnt;
570
571 if (retval != ERROR_OK)
572 return retval;
573
574 *len = count;
575
576 retval = gdb_get_char(connection, &character);
577 if (retval != ERROR_OK)
578 return retval;
579 checksum[0] = character;
580 retval = gdb_get_char(connection, &character);
581 if (retval != ERROR_OK)
582 return retval;
583 checksum[1] = character;
584 checksum[2] = 0;
585
586 if (!noack)
587 *checksum_ok = (my_checksum == strtoul(checksum, NULL, 16));
588
589 return ERROR_OK;
590 }
591
592 static int gdb_get_packet_inner(struct connection *connection,
593 char *buffer, int *len)
594 {
595 int character;
596 int retval;
597 struct gdb_connection *gdb_con = connection->priv;
598
599 while (1) {
600 do {
601 retval = gdb_get_char(connection, &character);
602 if (retval != ERROR_OK)
603 return retval;
604
605 #ifdef _DEBUG_GDB_IO_
606 LOG_DEBUG("character: '%c'", character);
607 #endif
608
609 switch (character) {
610 case '$':
611 break;
612 case '+':
613 /* gdb sends a dummy ack '+' at every remote connect - see
614 * remote_start_remote (remote.c)
615 * in case anyone tries to debug why they receive this
616 * warning every time */
617 LOG_WARNING("acknowledgment received, but no packet pending");
618 break;
619 case '-':
620 LOG_WARNING("negative acknowledgment, but no packet pending");
621 break;
622 case 0x3:
623 gdb_con->ctrl_c = 1;
624 *len = 0;
625 return ERROR_OK;
626 default:
627 LOG_WARNING("ignoring character 0x%x", character);
628 break;
629 }
630 } while (character != '$');
631
632 int checksum_ok = 0;
633 /* explicit code expansion here to get faster inlined code in -O3 by not
634 * calculating checksum */
635 if (gdb_con->noack_mode) {
636 retval = fetch_packet(connection, &checksum_ok, 1, len, buffer);
637 if (retval != ERROR_OK)
638 return retval;
639 } else {
640 retval = fetch_packet(connection, &checksum_ok, 0, len, buffer);
641 if (retval != ERROR_OK)
642 return retval;
643 }
644
645 if (gdb_con->noack_mode) {
646 /* checksum is not checked in noack mode */
647 break;
648 }
649 if (checksum_ok) {
650 retval = gdb_write(connection, "+", 1);
651 if (retval != ERROR_OK)
652 return retval;
653 break;
654 }
655 }
656 if (gdb_con->closed)
657 return ERROR_SERVER_REMOTE_CLOSED;
658
659 return ERROR_OK;
660 }
661
662 static int gdb_get_packet(struct connection *connection, char *buffer, int *len)
663 {
664 struct gdb_connection *gdb_con = connection->priv;
665 gdb_con->busy = 1;
666 int retval = gdb_get_packet_inner(connection, buffer, len);
667 gdb_con->busy = 0;
668 return retval;
669 }
670
671 static int gdb_output_con(struct connection *connection, const char *line)
672 {
673 char *hex_buffer;
674 int bin_size;
675
676 bin_size = strlen(line);
677
678 hex_buffer = malloc(bin_size * 2 + 2);
679 if (hex_buffer == NULL)
680 return ERROR_GDB_BUFFER_TOO_SMALL;
681
682 hex_buffer[0] = 'O';
683 int pkt_len = hexify(hex_buffer + 1, line, bin_size, bin_size * 2 + 1);
684 int retval = gdb_put_packet(connection, hex_buffer, pkt_len + 1);
685
686 free(hex_buffer);
687 return retval;
688 }
689
690 static int gdb_output(struct command_context *context, const char *line)
691 {
692 /* this will be dumped to the log and also sent as an O packet if possible */
693 LOG_USER_N("%s", line);
694 return ERROR_OK;
695 }
696
697 static void gdb_signal_reply(struct target *target, struct connection *connection)
698 {
699 struct gdb_connection *gdb_connection = connection->priv;
700 char sig_reply[20];
701 char stop_reason[20];
702 int sig_reply_len;
703 int signal_var;
704
705 if (target->debug_reason == DBG_REASON_EXIT) {
706 sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "W00");
707 } else {
708 if (gdb_connection->ctrl_c) {
709 signal_var = 0x2;
710 gdb_connection->ctrl_c = 0;
711 } else
712 signal_var = gdb_last_signal(target);
713
714 stop_reason[0] = '\0';
715 if (target->debug_reason == DBG_REASON_WATCHPOINT) {
716 enum watchpoint_rw hit_wp_type;
717 uint32_t hit_wp_address;
718
719 if (watchpoint_hit(target, &hit_wp_type, &hit_wp_address) == ERROR_OK) {
720
721 switch (hit_wp_type) {
722 case WPT_WRITE:
723 snprintf(stop_reason, sizeof(stop_reason),
724 "watch:%08x;", hit_wp_address);
725 break;
726 case WPT_READ:
727 snprintf(stop_reason, sizeof(stop_reason),
728 "rwatch:%08x;", hit_wp_address);
729 break;
730 case WPT_ACCESS:
731 snprintf(stop_reason, sizeof(stop_reason),
732 "awatch:%08x;", hit_wp_address);
733 break;
734 default:
735 break;
736 }
737 }
738 }
739
740 sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "T%2.2x%s",
741 signal_var, stop_reason);
742 }
743
744 gdb_put_packet(connection, sig_reply, sig_reply_len);
745 gdb_connection->frontend_state = TARGET_HALTED;
746 rtos_update_threads(target);
747 }
748
749 static void gdb_fileio_reply(struct target *target, struct connection *connection)
750 {
751 struct gdb_connection *gdb_connection = connection->priv;
752 char fileio_command[256];
753 int command_len;
754 bool program_exited = false;
755
756 if (strcmp(target->fileio_info->identifier, "open") == 0)
757 sprintf(fileio_command, "F%s,%x/%x,%x,%x", target->fileio_info->identifier,
758 target->fileio_info->param_1,
759 target->fileio_info->param_2,
760 target->fileio_info->param_3,
761 target->fileio_info->param_4);
762 else if (strcmp(target->fileio_info->identifier, "close") == 0)
763 sprintf(fileio_command, "F%s,%x", target->fileio_info->identifier,
764 target->fileio_info->param_1);
765 else if (strcmp(target->fileio_info->identifier, "read") == 0)
766 sprintf(fileio_command, "F%s,%x,%x,%x", target->fileio_info->identifier,
767 target->fileio_info->param_1,
768 target->fileio_info->param_2,
769 target->fileio_info->param_3);
770 else if (strcmp(target->fileio_info->identifier, "write") == 0)
771 sprintf(fileio_command, "F%s,%x,%x,%x", target->fileio_info->identifier,
772 target->fileio_info->param_1,
773 target->fileio_info->param_2,
774 target->fileio_info->param_3);
775 else if (strcmp(target->fileio_info->identifier, "lseek") == 0)
776 sprintf(fileio_command, "F%s,%x,%x,%x", target->fileio_info->identifier,
777 target->fileio_info->param_1,
778 target->fileio_info->param_2,
779 target->fileio_info->param_3);
780 else if (strcmp(target->fileio_info->identifier, "rename") == 0)
781 sprintf(fileio_command, "F%s,%x/%x,%x/%x", target->fileio_info->identifier,
782 target->fileio_info->param_1,
783 target->fileio_info->param_2,
784 target->fileio_info->param_3,
785 target->fileio_info->param_4);
786 else if (strcmp(target->fileio_info->identifier, "unlink") == 0)
787 sprintf(fileio_command, "F%s,%x/%x", target->fileio_info->identifier,
788 target->fileio_info->param_1,
789 target->fileio_info->param_2);
790 else if (strcmp(target->fileio_info->identifier, "stat") == 0)
791 sprintf(fileio_command, "F%s,%x/%x,%x", target->fileio_info->identifier,
792 target->fileio_info->param_1,
793 target->fileio_info->param_2,
794 target->fileio_info->param_3);
795 else if (strcmp(target->fileio_info->identifier, "fstat") == 0)
796 sprintf(fileio_command, "F%s,%x,%x", target->fileio_info->identifier,
797 target->fileio_info->param_1,
798 target->fileio_info->param_2);
799 else if (strcmp(target->fileio_info->identifier, "gettimeofday") == 0)
800 sprintf(fileio_command, "F%s,%x,%x", target->fileio_info->identifier,
801 target->fileio_info->param_1,
802 target->fileio_info->param_2);
803 else if (strcmp(target->fileio_info->identifier, "isatty") == 0)
804 sprintf(fileio_command, "F%s,%x", target->fileio_info->identifier,
805 target->fileio_info->param_1);
806 else if (strcmp(target->fileio_info->identifier, "system") == 0)
807 sprintf(fileio_command, "F%s,%x/%x", target->fileio_info->identifier,
808 target->fileio_info->param_1,
809 target->fileio_info->param_2);
810 else if (strcmp(target->fileio_info->identifier, "exit") == 0) {
811 /* If target hits exit syscall, report to GDB the program is terminated.
812 * In addition, let target run its own exit syscall handler. */
813 program_exited = true;
814 sprintf(fileio_command, "W%02x", target->fileio_info->param_1);
815 } else {
816 LOG_DEBUG("Unknown syscall: %s", target->fileio_info->identifier);
817
818 /* encounter unknown syscall, continue */
819 gdb_connection->frontend_state = TARGET_RUNNING;
820 target_resume(target, 1, 0x0, 0, 0);
821 return;
822 }
823
824 command_len = strlen(fileio_command);
825 gdb_put_packet(connection, fileio_command, command_len);
826
827 if (program_exited) {
828 /* Use target_resume() to let target run its own exit syscall handler. */
829 gdb_connection->frontend_state = TARGET_RUNNING;
830 target_resume(target, 1, 0x0, 0, 0);
831 } else {
832 gdb_connection->frontend_state = TARGET_HALTED;
833 rtos_update_threads(target);
834 }
835 }
836
837 static void gdb_frontend_halted(struct target *target, struct connection *connection)
838 {
839 struct gdb_connection *gdb_connection = connection->priv;
840
841 /* In the GDB protocol when we are stepping or continuing execution,
842 * we have a lingering reply. Upon receiving a halted event
843 * when we have that lingering packet, we reply to the original
844 * step or continue packet.
845 *
846 * Executing monitor commands can bring the target in and
847 * out of the running state so we'll see lots of TARGET_EVENT_XXX
848 * that are to be ignored.
849 */
850 if (gdb_connection->frontend_state == TARGET_RUNNING) {
851 /* stop forwarding log packets! */
852 log_remove_callback(gdb_log_callback, connection);
853
854 /* check fileio first */
855 if (target_get_gdb_fileio_info(target, target->fileio_info) == ERROR_OK)
856 gdb_fileio_reply(target, connection);
857 else
858 gdb_signal_reply(target, connection);
859 }
860 }
861
862 static int gdb_target_callback_event_handler(struct target *target,
863 enum target_event event, void *priv)
864 {
865 int retval;
866 struct connection *connection = priv;
867 struct gdb_service *gdb_service = connection->service->priv;
868
869 if (gdb_service->target != target)
870 return ERROR_OK;
871
872 switch (event) {
873 case TARGET_EVENT_GDB_HALT:
874 gdb_frontend_halted(target, connection);
875 break;
876 case TARGET_EVENT_HALTED:
877 target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
878 break;
879 case TARGET_EVENT_GDB_FLASH_ERASE_START:
880 retval = jtag_execute_queue();
881 if (retval != ERROR_OK)
882 return retval;
883 break;
884 default:
885 break;
886 }
887
888 return ERROR_OK;
889 }
890
891 static int gdb_new_connection(struct connection *connection)
892 {
893 struct gdb_connection *gdb_connection = malloc(sizeof(struct gdb_connection));
894 struct gdb_service *gdb_service = connection->service->priv;
895 int retval;
896 int initial_ack;
897
898 connection->priv = gdb_connection;
899
900 /* initialize gdb connection information */
901 gdb_connection->buf_p = gdb_connection->buffer;
902 gdb_connection->buf_cnt = 0;
903 gdb_connection->ctrl_c = 0;
904 gdb_connection->frontend_state = TARGET_HALTED;
905 gdb_connection->vflash_image = NULL;
906 gdb_connection->closed = 0;
907 gdb_connection->busy = 0;
908 gdb_connection->noack_mode = 0;
909 gdb_connection->sync = false;
910 gdb_connection->mem_write_error = false;
911 gdb_connection->attached = true;
912
913 /* send ACK to GDB for debug request */
914 gdb_write(connection, "+", 1);
915
916 /* output goes through gdb connection */
917 command_set_output_handler(connection->cmd_ctx, gdb_output, connection);
918
919 /* we must remove all breakpoints registered to the target as a previous
920 * GDB session could leave dangling breakpoints if e.g. communication
921 * timed out.
922 */
923 breakpoint_clear_target(gdb_service->target);
924 watchpoint_clear_target(gdb_service->target);
925
926 /* clean previous rtos session if supported*/
927 if ((gdb_service->target->rtos) && (gdb_service->target->rtos->type->clean))
928 gdb_service->target->rtos->type->clean(gdb_service->target);
929
930 /* remove the initial ACK from the incoming buffer */
931 retval = gdb_get_char(connection, &initial_ack);
932 if (retval != ERROR_OK)
933 return retval;
934
935 /* FIX!!!??? would we actually ever receive a + here???
936 * Not observed.
937 */
938 if (initial_ack != '+')
939 gdb_putback_char(connection, initial_ack);
940 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);
941
942 if (gdb_use_memory_map) {
943 /* Connect must fail if the memory map can't be set up correctly.
944 *
945 * This will cause an auto_probe to be invoked, which is either
946 * a no-op or it will fail when the target isn't ready(e.g. not halted).
947 */
948 int i;
949 for (i = 0; i < flash_get_bank_count(); i++) {
950 struct flash_bank *p;
951 retval = get_flash_bank_by_num(i, &p);
952 if (retval != ERROR_OK) {
953 LOG_ERROR("Connect failed. Consider setting up a gdb-attach event for the target " \
954 "to prepare target for GDB connect, or use 'gdb_memory_map disable'.");
955 return retval;
956 }
957 }
958 }
959
960 gdb_actual_connections++;
961 LOG_DEBUG("New GDB Connection: %d, Target %s, state: %s",
962 gdb_actual_connections,
963 target_name(gdb_service->target),
964 target_state_name(gdb_service->target));
965
966 /* DANGER! If we fail subsequently, we must remove this handler,
967 * otherwise we occasionally see crashes as the timer can invoke the
968 * callback fn.
969 *
970 * register callback to be informed about target events */
971 target_register_event_callback(gdb_target_callback_event_handler, connection);
972
973 return ERROR_OK;
974 }
975
976 static int gdb_connection_closed(struct connection *connection)
977 {
978 struct gdb_service *gdb_service = connection->service->priv;
979 struct gdb_connection *gdb_connection = connection->priv;
980
981 /* we're done forwarding messages. Tear down callback before
982 * cleaning up connection.
983 */
984 log_remove_callback(gdb_log_callback, connection);
985
986 gdb_actual_connections--;
987 LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d",
988 target_name(gdb_service->target),
989 target_state_name(gdb_service->target),
990 gdb_actual_connections);
991
992 /* see if an image built with vFlash commands is left */
993 if (gdb_connection->vflash_image) {
994 image_close(gdb_connection->vflash_image);
995 free(gdb_connection->vflash_image);
996 gdb_connection->vflash_image = NULL;
997 }
998
999 /* if this connection registered a debug-message receiver delete it */
1000 delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
1001
1002 if (connection->priv) {
1003 free(connection->priv);
1004 connection->priv = NULL;
1005 } else
1006 LOG_ERROR("BUG: connection->priv == NULL");
1007
1008 target_unregister_event_callback(gdb_target_callback_event_handler, connection);
1009
1010 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);
1011
1012 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
1013
1014 return ERROR_OK;
1015 }
1016
1017 static void gdb_send_error(struct connection *connection, uint8_t the_error)
1018 {
1019 char err[4];
1020 snprintf(err, 4, "E%2.2X", the_error);
1021 gdb_put_packet(connection, err, 3);
1022 }
1023
1024 static int gdb_last_signal_packet(struct connection *connection,
1025 char *packet, int packet_size)
1026 {
1027 struct target *target = get_target_from_connection(connection);
1028 struct gdb_connection *gdb_con = connection->priv;
1029 char sig_reply[4];
1030 int signal_var;
1031
1032 if (!gdb_con->attached) {
1033 /* if we are here we have received a kill packet
1034 * reply W stop reply otherwise gdb gets very unhappy */
1035 gdb_put_packet(connection, "W00", 3);
1036 return ERROR_OK;
1037 }
1038
1039 signal_var = gdb_last_signal(target);
1040
1041 snprintf(sig_reply, 4, "S%2.2x", signal_var);
1042 gdb_put_packet(connection, sig_reply, 3);
1043
1044 return ERROR_OK;
1045 }
1046
1047 static inline int gdb_reg_pos(struct target *target, int pos, int len)
1048 {
1049 if (target->endianness == TARGET_LITTLE_ENDIAN)
1050 return pos;
1051 else
1052 return len - 1 - pos;
1053 }
1054
1055 /* Convert register to string of bytes. NB! The # of bits in the
1056 * register might be non-divisible by 8(a byte), in which
1057 * case an entire byte is shown.
1058 *
1059 * NB! the format on the wire is the target endianness
1060 *
1061 * The format of reg->value is little endian
1062 *
1063 */
1064 static void gdb_str_to_target(struct target *target,
1065 char *tstr, struct reg *reg)
1066 {
1067 int i;
1068
1069 uint8_t *buf;
1070 int buf_len;
1071 buf = reg->value;
1072 buf_len = DIV_ROUND_UP(reg->size, 8);
1073
1074 for (i = 0; i < buf_len; i++) {
1075 int j = gdb_reg_pos(target, i, buf_len);
1076 tstr += sprintf(tstr, "%02x", buf[j]);
1077 }
1078 }
1079
1080 /* copy over in register buffer */
1081 static void gdb_target_to_reg(struct target *target,
1082 char *tstr, int str_len, uint8_t *bin)
1083 {
1084 if (str_len % 2) {
1085 LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
1086 exit(-1);
1087 }
1088
1089 int i;
1090 for (i = 0; i < str_len; i += 2) {
1091 unsigned t;
1092 if (sscanf(tstr + i, "%02x", &t) != 1) {
1093 LOG_ERROR("BUG: unable to convert register value");
1094 exit(-1);
1095 }
1096
1097 int j = gdb_reg_pos(target, i/2, str_len/2);
1098 bin[j] = t;
1099 }
1100 }
1101
1102 static int gdb_get_registers_packet(struct connection *connection,
1103 char *packet, int packet_size)
1104 {
1105 struct target *target = get_target_from_connection(connection);
1106 struct reg **reg_list;
1107 int reg_list_size;
1108 int retval;
1109 int reg_packet_size = 0;
1110 char *reg_packet;
1111 char *reg_packet_p;
1112 int i;
1113
1114 #ifdef _DEBUG_GDB_IO_
1115 LOG_DEBUG("-");
1116 #endif
1117
1118 if ((target->rtos != NULL) && (ERROR_OK == rtos_get_gdb_reg_list(connection)))
1119 return ERROR_OK;
1120
1121 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1122 REG_CLASS_GENERAL);
1123 if (retval != ERROR_OK)
1124 return gdb_error(connection, retval);
1125
1126 for (i = 0; i < reg_list_size; i++)
1127 reg_packet_size += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
1128
1129 assert(reg_packet_size > 0);
1130
1131 reg_packet = malloc(reg_packet_size + 1); /* plus one for string termination null */
1132 reg_packet_p = reg_packet;
1133
1134 for (i = 0; i < reg_list_size; i++) {
1135 if (!reg_list[i]->valid)
1136 reg_list[i]->type->get(reg_list[i]);
1137 gdb_str_to_target(target, reg_packet_p, reg_list[i]);
1138 reg_packet_p += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
1139 }
1140
1141 #ifdef _DEBUG_GDB_IO_
1142 {
1143 char *reg_packet_p_debug;
1144 reg_packet_p_debug = strndup(reg_packet, reg_packet_size);
1145 LOG_DEBUG("reg_packet: %s", reg_packet_p_debug);
1146 free(reg_packet_p_debug);
1147 }
1148 #endif
1149
1150 gdb_put_packet(connection, reg_packet, reg_packet_size);
1151 free(reg_packet);
1152
1153 free(reg_list);
1154
1155 return ERROR_OK;
1156 }
1157
1158 static int gdb_set_registers_packet(struct connection *connection,
1159 char *packet, int packet_size)
1160 {
1161 struct target *target = get_target_from_connection(connection);
1162 int i;
1163 struct reg **reg_list;
1164 int reg_list_size;
1165 int retval;
1166 char *packet_p;
1167
1168 #ifdef _DEBUG_GDB_IO_
1169 LOG_DEBUG("-");
1170 #endif
1171
1172 /* skip command character */
1173 packet++;
1174 packet_size--;
1175
1176 if (packet_size % 2) {
1177 LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection");
1178 return ERROR_SERVER_REMOTE_CLOSED;
1179 }
1180
1181 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1182 REG_CLASS_GENERAL);
1183 if (retval != ERROR_OK)
1184 return gdb_error(connection, retval);
1185
1186 packet_p = packet;
1187 for (i = 0; i < reg_list_size; i++) {
1188 uint8_t *bin_buf;
1189 int chars = (DIV_ROUND_UP(reg_list[i]->size, 8) * 2);
1190
1191 if (packet_p + chars > packet + packet_size)
1192 LOG_ERROR("BUG: register packet is too small for registers");
1193
1194 bin_buf = malloc(DIV_ROUND_UP(reg_list[i]->size, 8));
1195 gdb_target_to_reg(target, packet_p, chars, bin_buf);
1196
1197 reg_list[i]->type->set(reg_list[i], bin_buf);
1198
1199 /* advance packet pointer */
1200 packet_p += chars;
1201
1202 free(bin_buf);
1203 }
1204
1205 /* free struct reg *reg_list[] array allocated by get_gdb_reg_list */
1206 free(reg_list);
1207
1208 gdb_put_packet(connection, "OK", 2);
1209
1210 return ERROR_OK;
1211 }
1212
1213 static int gdb_get_register_packet(struct connection *connection,
1214 char *packet, int packet_size)
1215 {
1216 struct target *target = get_target_from_connection(connection);
1217 char *reg_packet;
1218 int reg_num = strtoul(packet + 1, NULL, 16);
1219 struct reg **reg_list;
1220 int reg_list_size;
1221 int retval;
1222
1223 #ifdef _DEBUG_GDB_IO_
1224 LOG_DEBUG("-");
1225 #endif
1226
1227 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1228 REG_CLASS_ALL);
1229 if (retval != ERROR_OK)
1230 return gdb_error(connection, retval);
1231
1232 if (reg_list_size <= reg_num) {
1233 LOG_ERROR("gdb requested a non-existing register");
1234 return ERROR_SERVER_REMOTE_CLOSED;
1235 }
1236
1237 if (!reg_list[reg_num]->valid)
1238 reg_list[reg_num]->type->get(reg_list[reg_num]);
1239
1240 reg_packet = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2 + 1); /* plus one for string termination null */
1241
1242 gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
1243
1244 gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1245
1246 free(reg_list);
1247 free(reg_packet);
1248
1249 return ERROR_OK;
1250 }
1251
1252 static int gdb_set_register_packet(struct connection *connection,
1253 char *packet, int packet_size)
1254 {
1255 struct target *target = get_target_from_connection(connection);
1256 char *separator;
1257 uint8_t *bin_buf;
1258 int reg_num = strtoul(packet + 1, &separator, 16);
1259 struct reg **reg_list;
1260 int reg_list_size;
1261 int retval;
1262
1263 LOG_DEBUG("-");
1264
1265 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1266 REG_CLASS_ALL);
1267 if (retval != ERROR_OK)
1268 return gdb_error(connection, retval);
1269
1270 if (reg_list_size <= reg_num) {
1271 LOG_ERROR("gdb requested a non-existing register");
1272 return ERROR_SERVER_REMOTE_CLOSED;
1273 }
1274
1275 if (*separator != '=') {
1276 LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
1277 return ERROR_SERVER_REMOTE_CLOSED;
1278 }
1279
1280 /* convert from GDB-string (target-endian) to hex-string (big-endian) */
1281 bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
1282 int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1283
1284 if ((unsigned int)chars != strlen(separator + 1)) {
1285 LOG_ERROR("gdb sent a packet with wrong register size");
1286 free(bin_buf);
1287 return ERROR_SERVER_REMOTE_CLOSED;
1288 }
1289
1290 gdb_target_to_reg(target, separator + 1, chars, bin_buf);
1291
1292 reg_list[reg_num]->type->set(reg_list[reg_num], bin_buf);
1293
1294 gdb_put_packet(connection, "OK", 2);
1295
1296 free(bin_buf);
1297 free(reg_list);
1298
1299 return ERROR_OK;
1300 }
1301
1302 /* No attempt is made to translate the "retval" to
1303 * GDB speak. This has to be done at the calling
1304 * site as no mapping really exists.
1305 */
1306 static int gdb_error(struct connection *connection, int retval)
1307 {
1308 LOG_DEBUG("Reporting %i to GDB as generic error", retval);
1309 gdb_send_error(connection, EFAULT);
1310 return ERROR_OK;
1311 }
1312
1313 /* We don't have to worry about the default 2 second timeout for GDB packets,
1314 * because GDB breaks up large memory reads into smaller reads.
1315 *
1316 * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
1317 */
1318 static int gdb_read_memory_packet(struct connection *connection,
1319 char *packet, int packet_size)
1320 {
1321 struct target *target = get_target_from_connection(connection);
1322 char *separator;
1323 uint32_t addr = 0;
1324 uint32_t len = 0;
1325
1326 uint8_t *buffer;
1327 char *hex_buffer;
1328
1329 int retval = ERROR_OK;
1330
1331 /* skip command character */
1332 packet++;
1333
1334 addr = strtoul(packet, &separator, 16);
1335
1336 if (*separator != ',') {
1337 LOG_ERROR("incomplete read memory packet received, dropping connection");
1338 return ERROR_SERVER_REMOTE_CLOSED;
1339 }
1340
1341 len = strtoul(separator + 1, NULL, 16);
1342
1343 buffer = malloc(len);
1344
1345 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1346
1347 retval = target_read_buffer(target, addr, len, buffer);
1348
1349 if ((retval != ERROR_OK) && !gdb_report_data_abort) {
1350 /* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
1351 * At some point this might be fixed in GDB, in which case this code can be removed.
1352 *
1353 * OpenOCD developers are acutely aware of this problem, but there is nothing
1354 * gained by involving the user in this problem that hopefully will get resolved
1355 * eventually
1356 *
1357 * http://sourceware.org/cgi-bin/gnatsweb.pl? \
1358 * cmd = view%20audit-trail&database = gdb&pr = 2395
1359 *
1360 * For now, the default is to fix up things to make current GDB versions work.
1361 * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
1362 */
1363 memset(buffer, 0, len);
1364 retval = ERROR_OK;
1365 }
1366
1367 if (retval == ERROR_OK) {
1368 hex_buffer = malloc(len * 2 + 1);
1369
1370 int pkt_len = hexify(hex_buffer, (char *)buffer, len, len * 2 + 1);
1371
1372 gdb_put_packet(connection, hex_buffer, pkt_len);
1373
1374 free(hex_buffer);
1375 } else
1376 retval = gdb_error(connection, retval);
1377
1378 free(buffer);
1379
1380 return retval;
1381 }
1382
1383 static int gdb_write_memory_packet(struct connection *connection,
1384 char *packet, int packet_size)
1385 {
1386 struct target *target = get_target_from_connection(connection);
1387 char *separator;
1388 uint32_t addr = 0;
1389 uint32_t len = 0;
1390
1391 uint8_t *buffer;
1392 int retval;
1393
1394 /* skip command character */
1395 packet++;
1396
1397 addr = strtoul(packet, &separator, 16);
1398
1399 if (*separator != ',') {
1400 LOG_ERROR("incomplete write memory packet received, dropping connection");
1401 return ERROR_SERVER_REMOTE_CLOSED;
1402 }
1403
1404 len = strtoul(separator + 1, &separator, 16);
1405
1406 if (*(separator++) != ':') {
1407 LOG_ERROR("incomplete write memory packet received, dropping connection");
1408 return ERROR_SERVER_REMOTE_CLOSED;
1409 }
1410
1411 buffer = malloc(len);
1412
1413 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1414
1415 if (unhexify((char *)buffer, separator, len) != (int)len)
1416 LOG_ERROR("unable to decode memory packet");
1417
1418 retval = target_write_buffer(target, addr, len, buffer);
1419
1420 if (retval == ERROR_OK)
1421 gdb_put_packet(connection, "OK", 2);
1422 else
1423 retval = gdb_error(connection, retval);
1424
1425 free(buffer);
1426
1427 return retval;
1428 }
1429
1430 static int gdb_write_memory_binary_packet(struct connection *connection,
1431 char *packet, int packet_size)
1432 {
1433 struct target *target = get_target_from_connection(connection);
1434 char *separator;
1435 uint32_t addr = 0;
1436 uint32_t len = 0;
1437
1438 int retval = ERROR_OK;
1439
1440 /* skip command character */
1441 packet++;
1442
1443 addr = strtoul(packet, &separator, 16);
1444
1445 if (*separator != ',') {
1446 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1447 return ERROR_SERVER_REMOTE_CLOSED;
1448 }
1449
1450 len = strtoul(separator + 1, &separator, 16);
1451
1452 if (*(separator++) != ':') {
1453 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1454 return ERROR_SERVER_REMOTE_CLOSED;
1455 }
1456
1457 struct gdb_connection *gdb_connection = connection->priv;
1458
1459 if (gdb_connection->mem_write_error) {
1460 retval = ERROR_FAIL;
1461 /* now that we have reported the memory write error, we can clear the condition */
1462 gdb_connection->mem_write_error = false;
1463 }
1464
1465 /* By replying the packet *immediately* GDB will send us a new packet
1466 * while we write the last one to the target.
1467 */
1468 if (retval == ERROR_OK)
1469 gdb_put_packet(connection, "OK", 2);
1470 else {
1471 retval = gdb_error(connection, retval);
1472 if (retval != ERROR_OK)
1473 return retval;
1474 }
1475
1476 if (len) {
1477 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1478
1479 retval = target_write_buffer(target, addr, len, (uint8_t *)separator);
1480 if (retval != ERROR_OK)
1481 gdb_connection->mem_write_error = true;
1482 }
1483
1484 return ERROR_OK;
1485 }
1486
1487 static int gdb_step_continue_packet(struct connection *connection,
1488 char *packet, int packet_size)
1489 {
1490 struct target *target = get_target_from_connection(connection);
1491 int current = 0;
1492 uint32_t address = 0x0;
1493 int retval = ERROR_OK;
1494
1495 LOG_DEBUG("-");
1496
1497 if (packet_size > 1) {
1498 packet[packet_size] = 0;
1499 address = strtoul(packet + 1, NULL, 16);
1500 } else
1501 current = 1;
1502
1503 gdb_running_type = packet[0];
1504 if (packet[0] == 'c') {
1505 LOG_DEBUG("continue");
1506 /* resume at current address, don't handle breakpoints, not debugging */
1507 retval = target_resume(target, current, address, 0, 0);
1508 } else if (packet[0] == 's') {
1509 LOG_DEBUG("step");
1510 /* step at current or address, don't handle breakpoints */
1511 retval = target_step(target, current, address, 0);
1512 }
1513 return retval;
1514 }
1515
1516 static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
1517 char *packet, int packet_size)
1518 {
1519 struct target *target = get_target_from_connection(connection);
1520 int type;
1521 enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
1522 enum watchpoint_rw wp_type = WPT_READ /* dummy init to avoid warning */;
1523 uint32_t address;
1524 uint32_t size;
1525 char *separator;
1526 int retval;
1527
1528 LOG_DEBUG("-");
1529
1530 type = strtoul(packet + 1, &separator, 16);
1531
1532 if (type == 0) /* memory breakpoint */
1533 bp_type = BKPT_SOFT;
1534 else if (type == 1) /* hardware breakpoint */
1535 bp_type = BKPT_HARD;
1536 else if (type == 2) /* write watchpoint */
1537 wp_type = WPT_WRITE;
1538 else if (type == 3) /* read watchpoint */
1539 wp_type = WPT_READ;
1540 else if (type == 4) /* access watchpoint */
1541 wp_type = WPT_ACCESS;
1542 else {
1543 LOG_ERROR("invalid gdb watch/breakpoint type(%d), dropping connection", type);
1544 return ERROR_SERVER_REMOTE_CLOSED;
1545 }
1546
1547 if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT) || (bp_type == BKPT_HARD)))
1548 bp_type = gdb_breakpoint_override_type;
1549
1550 if (*separator != ',') {
1551 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1552 return ERROR_SERVER_REMOTE_CLOSED;
1553 }
1554
1555 address = strtoul(separator + 1, &separator, 16);
1556
1557 if (*separator != ',') {
1558 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1559 return ERROR_SERVER_REMOTE_CLOSED;
1560 }
1561
1562 size = strtoul(separator + 1, &separator, 16);
1563
1564 switch (type) {
1565 case 0:
1566 case 1:
1567 if (packet[0] == 'Z') {
1568 retval = breakpoint_add(target, address, size, bp_type);
1569 if (retval != ERROR_OK) {
1570 retval = gdb_error(connection, retval);
1571 if (retval != ERROR_OK)
1572 return retval;
1573 } else
1574 gdb_put_packet(connection, "OK", 2);
1575 } else {
1576 breakpoint_remove(target, address);
1577 gdb_put_packet(connection, "OK", 2);
1578 }
1579 break;
1580 case 2:
1581 case 3:
1582 case 4:
1583 {
1584 if (packet[0] == 'Z') {
1585 retval = watchpoint_add(target, address, size, wp_type, 0, 0xffffffffu);
1586 if (retval != ERROR_OK) {
1587 retval = gdb_error(connection, retval);
1588 if (retval != ERROR_OK)
1589 return retval;
1590 } else
1591 gdb_put_packet(connection, "OK", 2);
1592 } else {
1593 watchpoint_remove(target, address);
1594 gdb_put_packet(connection, "OK", 2);
1595 }
1596 break;
1597 }
1598 default:
1599 break;
1600 }
1601
1602 return ERROR_OK;
1603 }
1604
1605 /* print out a string and allocate more space as needed,
1606 * mainly used for XML at this point
1607 */
1608 static void xml_printf(int *retval, char **xml, int *pos, int *size,
1609 const char *fmt, ...)
1610 {
1611 if (*retval != ERROR_OK)
1612 return;
1613 int first = 1;
1614
1615 for (;; ) {
1616 if ((*xml == NULL) || (!first)) {
1617 /* start by 0 to exercise all the code paths.
1618 * Need minimum 2 bytes to fit 1 char and 0 terminator. */
1619
1620 *size = *size * 2 + 2;
1621 char *t = *xml;
1622 *xml = realloc(*xml, *size);
1623 if (*xml == NULL) {
1624 if (t)
1625 free(t);
1626 *retval = ERROR_SERVER_REMOTE_CLOSED;
1627 return;
1628 }
1629 }
1630
1631 va_list ap;
1632 int ret;
1633 va_start(ap, fmt);
1634 ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
1635 va_end(ap);
1636 if ((ret > 0) && ((ret + 1) < *size - *pos)) {
1637 *pos += ret;
1638 return;
1639 }
1640 /* there was just enough or not enough space, allocate more. */
1641 first = 0;
1642 }
1643 }
1644
1645 static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len)
1646 {
1647 char *separator;
1648
1649 /* Extract and NUL-terminate the annex. */
1650 *annex = buf;
1651 while (*buf && *buf != ':')
1652 buf++;
1653 if (*buf == '\0')
1654 return -1;
1655 *buf++ = 0;
1656
1657 /* After the read marker and annex, qXfer looks like a
1658 * traditional 'm' packet. */
1659
1660 *ofs = strtoul(buf, &separator, 16);
1661
1662 if (*separator != ',')
1663 return -1;
1664
1665 *len = strtoul(separator + 1, NULL, 16);
1666
1667 return 0;
1668 }
1669
1670 static int compare_bank(const void *a, const void *b)
1671 {
1672 struct flash_bank *b1, *b2;
1673 b1 = *((struct flash_bank **)a);
1674 b2 = *((struct flash_bank **)b);
1675
1676 if (b1->base == b2->base)
1677 return 0;
1678 else if (b1->base > b2->base)
1679 return 1;
1680 else
1681 return -1;
1682 }
1683
1684 static int gdb_memory_map(struct connection *connection,
1685 char *packet, int packet_size)
1686 {
1687 /* We get away with only specifying flash here. Regions that are not
1688 * specified are treated as if we provided no memory map(if not we
1689 * could detect the holes and mark them as RAM).
1690 * Normally we only execute this code once, but no big deal if we
1691 * have to regenerate it a couple of times.
1692 */
1693
1694 struct target *target = get_target_from_connection(connection);
1695 struct flash_bank *p;
1696 char *xml = NULL;
1697 int size = 0;
1698 int pos = 0;
1699 int retval = ERROR_OK;
1700 struct flash_bank **banks;
1701 int offset;
1702 int length;
1703 char *separator;
1704 uint32_t ram_start = 0;
1705 int i;
1706 int target_flash_banks = 0;
1707
1708 /* skip command character */
1709 packet += 23;
1710
1711 offset = strtoul(packet, &separator, 16);
1712 length = strtoul(separator + 1, &separator, 16);
1713
1714 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1715
1716 /* Sort banks in ascending order. We need to report non-flash
1717 * memory as ram (or rather read/write) by default for GDB, since
1718 * it has no concept of non-cacheable read/write memory (i/o etc).
1719 *
1720 * FIXME Most non-flash addresses are *NOT* RAM! Don't lie.
1721 * Current versions of GDB assume unlisted addresses are RAM...
1722 */
1723 banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
1724
1725 for (i = 0; i < flash_get_bank_count(); i++) {
1726 retval = get_flash_bank_by_num(i, &p);
1727 if (retval != ERROR_OK) {
1728 free(banks);
1729 gdb_error(connection, retval);
1730 return retval;
1731 }
1732 if (p->target == target)
1733 banks[target_flash_banks++] = p;
1734 }
1735
1736 qsort(banks, target_flash_banks, sizeof(struct flash_bank *),
1737 compare_bank);
1738
1739 for (i = 0; i < target_flash_banks; i++) {
1740 int j;
1741 unsigned sector_size = 0;
1742 uint32_t start;
1743
1744 p = banks[i];
1745 start = p->base;
1746
1747 if (ram_start < p->base)
1748 xml_printf(&retval, &xml, &pos, &size,
1749 "<memory type=\"ram\" start=\"0x%x\" "
1750 "length=\"0x%x\"/>\n",
1751 ram_start, p->base - ram_start);
1752
1753 /* Report adjacent groups of same-size sectors. So for
1754 * example top boot CFI flash will list an initial region
1755 * with several large sectors (maybe 128KB) and several
1756 * smaller ones at the end (maybe 32KB). STR7 will have
1757 * regions with 8KB, 32KB, and 64KB sectors; etc.
1758 */
1759 for (j = 0; j < p->num_sectors; j++) {
1760 unsigned group_len;
1761
1762 /* Maybe start a new group of sectors. */
1763 if (sector_size == 0) {
1764 start = p->base + p->sectors[j].offset;
1765 xml_printf(&retval, &xml, &pos, &size,
1766 "<memory type=\"flash\" "
1767 "start=\"0x%x\" ",
1768 start);
1769 sector_size = p->sectors[j].size;
1770 }
1771
1772 /* Does this finish a group of sectors?
1773 * If not, continue an already-started group.
1774 */
1775 if (j == p->num_sectors - 1)
1776 group_len = (p->base + p->size) - start;
1777 else if (p->sectors[j + 1].size != sector_size)
1778 group_len = p->base + p->sectors[j + 1].offset
1779 - start;
1780 else
1781 continue;
1782
1783 xml_printf(&retval, &xml, &pos, &size,
1784 "length=\"0x%x\">\n"
1785 "<property name=\"blocksize\">"
1786 "0x%x</property>\n"
1787 "</memory>\n",
1788 group_len,
1789 sector_size);
1790 sector_size = 0;
1791 }
1792
1793 ram_start = p->base + p->size;
1794 }
1795
1796 if (ram_start != 0)
1797 xml_printf(&retval, &xml, &pos, &size,
1798 "<memory type=\"ram\" start=\"0x%x\" "
1799 "length=\"0x%x\"/>\n",
1800 ram_start, 0-ram_start);
1801 /* ELSE a flash chip could be at the very end of the 32 bit address
1802 * space, in which case ram_start will be precisely 0
1803 */
1804
1805 free(banks);
1806 banks = NULL;
1807
1808 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1809
1810 if (retval != ERROR_OK) {
1811 gdb_error(connection, retval);
1812 return retval;
1813 }
1814
1815 if (offset + length > pos)
1816 length = pos - offset;
1817
1818 char *t = malloc(length + 1);
1819 t[0] = 'l';
1820 memcpy(t + 1, xml + offset, length);
1821 gdb_put_packet(connection, t, length + 1);
1822
1823 free(t);
1824 free(xml);
1825 return ERROR_OK;
1826 }
1827
1828 static const char *gdb_get_reg_type_name(enum reg_type type)
1829 {
1830 switch (type) {
1831 case REG_TYPE_INT:
1832 return "int";
1833 case REG_TYPE_INT8:
1834 return "int8";
1835 case REG_TYPE_INT16:
1836 return "int16";
1837 case REG_TYPE_INT32:
1838 return "int32";
1839 case REG_TYPE_INT64:
1840 return "int64";
1841 case REG_TYPE_INT128:
1842 return "int128";
1843 case REG_TYPE_UINT8:
1844 return "uint8";
1845 case REG_TYPE_UINT16:
1846 return "uint16";
1847 case REG_TYPE_UINT32:
1848 return "uint32";
1849 case REG_TYPE_UINT64:
1850 return "uint64";
1851 case REG_TYPE_UINT128:
1852 return "uint128";
1853 case REG_TYPE_CODE_PTR:
1854 return "code_ptr";
1855 case REG_TYPE_DATA_PTR:
1856 return "data_ptr";
1857 case REG_TYPE_FLOAT:
1858 return "float";
1859 case REG_TYPE_IEEE_SINGLE:
1860 return "ieee_single";
1861 case REG_TYPE_IEEE_DOUBLE:
1862 return "ieee_double";
1863 case REG_TYPE_ARCH_DEFINED:
1864 return "int"; /* return arbitrary string to avoid compile warning. */
1865 }
1866
1867 return "int"; /* "int" as default value */
1868 }
1869
1870 static int gdb_generate_reg_type_description(struct target *target,
1871 char **tdesc, int *pos, int *size, struct reg_data_type *type)
1872 {
1873 int retval = ERROR_OK;
1874
1875 if (type->type_class == REG_TYPE_CLASS_VECTOR) {
1876 /* <vector id="id" type="type" count="count"/> */
1877 xml_printf(&retval, tdesc, pos, size,
1878 "<vector id=\"%s\" type=\"%s\" count=\"%d\"/>\n",
1879 type->id, type->reg_type_vector->type->id,
1880 type->reg_type_vector->count);
1881
1882 } else if (type->type_class == REG_TYPE_CLASS_UNION) {
1883 /* <union id="id">
1884 * <field name="name" type="type"/> ...
1885 * </union> */
1886 xml_printf(&retval, tdesc, pos, size,
1887 "<union id=\"%s\">\n",
1888 type->id);
1889
1890 struct reg_data_type_union_field *field;
1891 field = type->reg_type_union->fields;
1892 while (field != NULL) {
1893 xml_printf(&retval, tdesc, pos, size,
1894 "<field name=\"%s\" type=\"%s\"/>\n",
1895 field->name, field->type->id);
1896
1897 field = field->next;
1898 }
1899
1900 xml_printf(&retval, tdesc, pos, size,
1901 "</union>\n");
1902
1903 } else if (type->type_class == REG_TYPE_CLASS_STRUCT) {
1904 struct reg_data_type_struct_field *field;
1905 field = type->reg_type_struct->fields;
1906
1907 if (field->use_bitfields) {
1908 /* <struct id="id" size="size">
1909 * <field name="name" start="start" end="end"/> ...
1910 * </struct> */
1911 xml_printf(&retval, tdesc, pos, size,
1912 "<struct id=\"%s\" size=\"%d\">\n",
1913 type->id, type->reg_type_struct->size);
1914 while (field != NULL) {
1915 xml_printf(&retval, tdesc, pos, size,
1916 "<field name=\"%s\" start=\"%d\" end=\"%d\"/>\n",
1917 field->name, field->bitfield->start,
1918 field->bitfield->end);
1919
1920 field = field->next;
1921 }
1922 } else {
1923 /* <struct id="id">
1924 * <field name="name" type="type"/> ...
1925 * </struct> */
1926 xml_printf(&retval, tdesc, pos, size,
1927 "<struct id=\"%s\">\n",
1928 type->id);
1929 while (field != NULL) {
1930 xml_printf(&retval, tdesc, pos, size,
1931 "<field name=\"%s\" type=\"%s\"/>\n",
1932 field->name, field->type->id);
1933
1934 field = field->next;
1935 }
1936 }
1937
1938 xml_printf(&retval, tdesc, pos, size,
1939 "</struct>\n");
1940
1941 } else if (type->type_class == REG_TYPE_CLASS_FLAGS) {
1942 /* <flags id="id" size="size">
1943 * <field name="name" start="start" end="end"/> ...
1944 * </flags> */
1945 xml_printf(&retval, tdesc, pos, size,
1946 "<flags id=\"%s\" size=\"%d\">\n",
1947 type->id, type->reg_type_flags->size);
1948
1949 struct reg_data_type_flags_field *field;
1950 field = type->reg_type_flags->fields;
1951 while (field != NULL) {
1952 xml_printf(&retval, tdesc, pos, size,
1953 "<field name=\"%s\" start=\"%d\" end=\"%d\"/>\n",
1954 field->name, field->bitfield->start, field->bitfield->end);
1955
1956 field = field->next;
1957 }
1958
1959 xml_printf(&retval, tdesc, pos, size,
1960 "</flags>\n");
1961
1962 }
1963
1964 return ERROR_OK;
1965 }
1966
1967 /* Get a list of available target registers features. feature_list must
1968 * be freed by caller.
1969 */
1970 int get_reg_features_list(struct target *target, char **feature_list[], int *feature_list_size,
1971 struct reg **reg_list, int reg_list_size)
1972 {
1973 int tbl_sz = 0;
1974
1975 /* Start with only one element */
1976 *feature_list = calloc(1, sizeof(char *));
1977
1978 for (int i = 0; i < reg_list_size; i++) {
1979 if (reg_list[i]->exist == false)
1980 continue;
1981
1982 if ((reg_list[i]->feature->name != NULL)
1983 && (strcmp(reg_list[i]->feature->name, ""))) {
1984 /* We found a feature, check if the feature is already in the
1985 * table. If not, allocate a new entry for the table and
1986 * put the new feature in it.
1987 */
1988 for (int j = 0; j < (tbl_sz + 1); j++) {
1989 if (!((*feature_list)[j])) {
1990 (*feature_list)[tbl_sz++] = strdup(reg_list[i]->feature->name);
1991 *feature_list = realloc(*feature_list, sizeof(char *) * (tbl_sz + 1));
1992 (*feature_list)[tbl_sz] = NULL;
1993 break;
1994 } else {
1995 if (!strcmp((*feature_list)[j], reg_list[i]->feature->name))
1996 break;
1997 }
1998 }
1999 }
2000 }
2001
2002 if (feature_list_size)
2003 *feature_list_size = tbl_sz;
2004
2005 return ERROR_OK;
2006 }
2007
2008 static int gdb_generate_target_description(struct target *target, char **tdesc)
2009 {
2010 int retval = ERROR_OK;
2011 struct reg **reg_list;
2012 int reg_list_size;
2013 int pos = 0;
2014 int size = 0;
2015
2016 xml_printf(&retval, tdesc, &pos, &size,
2017 "<?xml version=\"1.0\"?>\n"
2018 "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
2019 "<target version=\"1.0\">\n");
2020
2021 retval = target_get_gdb_reg_list(target, &reg_list,
2022 &reg_list_size, REG_CLASS_ALL);
2023
2024 if (retval != ERROR_OK) {
2025 LOG_ERROR("get register list failed");
2026 return ERROR_FAIL;
2027 }
2028
2029 if (reg_list_size <= 0)
2030 return ERROR_FAIL;
2031
2032 char **features = NULL;
2033 /* Get a list of available target registers features */
2034 retval = get_reg_features_list(target, &features, NULL, reg_list, reg_list_size);
2035 if (retval != ERROR_OK) {
2036 LOG_ERROR("Can't get the registers feature list");
2037 return ERROR_FAIL;
2038 }
2039
2040 /* If we found some features associated with registers, create sections */
2041 int current_feature = 0;
2042
2043 /* generate target description according to register list */
2044 if (features != NULL) {
2045 while (features[current_feature]) {
2046
2047 xml_printf(&retval, tdesc, &pos, &size,
2048 "<feature name=\"%s\">\n",
2049 features[current_feature]);
2050
2051 int i;
2052 for (i = 0; i < reg_list_size; i++) {
2053
2054 if (reg_list[i]->exist == false)
2055 continue;
2056
2057 if (strcmp(reg_list[i]->feature->name, features[current_feature]))
2058 continue;
2059
2060 const char *type_str;
2061 if (reg_list[i]->reg_data_type != NULL) {
2062 if (reg_list[i]->reg_data_type->type == REG_TYPE_ARCH_DEFINED) {
2063 /* generate <type... first, if there are architecture-defined types. */
2064 gdb_generate_reg_type_description(target, tdesc, &pos, &size,
2065 reg_list[i]->reg_data_type);
2066
2067 type_str = reg_list[i]->reg_data_type->id;
2068 } else {
2069 /* predefined type */
2070 type_str = gdb_get_reg_type_name(
2071 reg_list[i]->reg_data_type->type);
2072 }
2073 } else {
2074 /* Default type is "int" */
2075 type_str = "int";
2076 }
2077
2078 xml_printf(&retval, tdesc, &pos, &size,
2079 "<reg name=\"%s\"", reg_list[i]->name);
2080 xml_printf(&retval, tdesc, &pos, &size,
2081 " bitsize=\"%d\"", reg_list[i]->size);
2082 xml_printf(&retval, tdesc, &pos, &size,
2083 " regnum=\"%d\"", reg_list[i]->number);
2084 if (reg_list[i]->caller_save)
2085 xml_printf(&retval, tdesc, &pos, &size,
2086 " save-restore=\"yes\"");
2087 else
2088 xml_printf(&retval, tdesc, &pos, &size,
2089 " save-restore=\"no\"");
2090
2091 xml_printf(&retval, tdesc, &pos, &size,
2092 " type=\"%s\"", type_str);
2093
2094 if (reg_list[i]->group != NULL)
2095 xml_printf(&retval, tdesc, &pos, &size,
2096 " group=\"%s\"", reg_list[i]->group);
2097
2098 xml_printf(&retval, tdesc, &pos, &size,
2099 "/>\n");
2100 }
2101
2102 xml_printf(&retval, tdesc, &pos, &size,
2103 "</feature>\n");
2104
2105 current_feature++;
2106 }
2107 }
2108
2109 xml_printf(&retval, tdesc, &pos, &size,
2110 "</target>\n");
2111
2112 if (reg_list != NULL)
2113 free(reg_list);
2114
2115 if (features != NULL)
2116 free(features);
2117
2118 return ERROR_OK;
2119 }
2120
2121 static int gdb_get_target_description_chunk(struct target *target, char **chunk,
2122 int32_t offset, uint32_t length)
2123 {
2124 static char *tdesc;
2125 static uint32_t tdesc_length;
2126
2127 if (tdesc == NULL) {
2128 gdb_generate_target_description(target, &tdesc);
2129 tdesc_length = strlen(tdesc);
2130 }
2131
2132 char transfer_type;
2133
2134 if (length < (tdesc_length - offset))
2135 transfer_type = 'm';
2136 else
2137 transfer_type = 'l';
2138
2139 *chunk = malloc(length + 2);
2140 (*chunk)[0] = transfer_type;
2141 if (transfer_type == 'm') {
2142 strncpy((*chunk) + 1, tdesc + offset, length);
2143 (*chunk)[1 + length] = '\0';
2144 } else {
2145 strncpy((*chunk) + 1, tdesc + offset, tdesc_length - offset);
2146 (*chunk)[1 + (tdesc_length - offset)] = '\0';
2147
2148 /* After gdb-server sends out last chunk, invalidate tdesc. */
2149 free(tdesc);
2150 tdesc = NULL;
2151 tdesc_length = 0;
2152 }
2153
2154 return ERROR_OK;
2155 }
2156
2157 static int gdb_target_description_supported(struct target *target, int *supported)
2158 {
2159 int retval = ERROR_OK;
2160 struct reg **reg_list = NULL;
2161 int reg_list_size = 0;
2162 int feature_list_size = 0;
2163
2164 retval = target_get_gdb_reg_list(target, &reg_list,
2165 &reg_list_size, REG_CLASS_ALL);
2166 if (retval != ERROR_OK) {
2167 LOG_ERROR("get register list failed");
2168 goto error;
2169 }
2170
2171 if (reg_list_size <= 0) {
2172 retval = ERROR_FAIL;
2173 goto error;
2174 }
2175
2176 char **features = NULL;
2177 /* Get a list of available target registers features */
2178 retval = get_reg_features_list(target, &features, &feature_list_size, reg_list, reg_list_size);
2179 if (retval != ERROR_OK) {
2180 LOG_ERROR("Can't get the registers feature list");
2181 goto error;
2182 }
2183
2184 if (supported) {
2185 if (feature_list_size)
2186 *supported = 1;
2187 else
2188 *supported = 0;
2189 }
2190
2191 error:
2192 if (reg_list != NULL)
2193 free(reg_list);
2194
2195 if (features != NULL)
2196 free(features);
2197
2198 return retval;
2199 }
2200
2201 static int gdb_query_packet(struct connection *connection,
2202 char *packet, int packet_size)
2203 {
2204 struct command_context *cmd_ctx = connection->cmd_ctx;
2205 struct gdb_connection *gdb_connection = connection->priv;
2206 struct target *target = get_target_from_connection(connection);
2207
2208 if (strncmp(packet, "qRcmd,", 6) == 0) {
2209 if (packet_size > 6) {
2210 char *cmd;
2211 cmd = malloc((packet_size - 6) / 2 + 1);
2212 int len = unhexify(cmd, packet + 6, (packet_size - 6) / 2);
2213 cmd[len] = 0;
2214
2215 /* We want to print all debug output to GDB connection */
2216 log_add_callback(gdb_log_callback, connection);
2217 target_call_timer_callbacks_now();
2218 /* some commands need to know the GDB connection, make note of current
2219 * GDB connection. */
2220 current_gdb_connection = gdb_connection;
2221 command_run_line(cmd_ctx, cmd);
2222 current_gdb_connection = NULL;
2223 target_call_timer_callbacks_now();
2224 log_remove_callback(gdb_log_callback, connection);
2225 free(cmd);
2226 }
2227 gdb_put_packet(connection, "OK", 2);
2228 return ERROR_OK;
2229 } else if (strncmp(packet, "qCRC:", 5) == 0) {
2230 if (packet_size > 5) {
2231 int retval;
2232 char gdb_reply[10];
2233 char *separator;
2234 uint32_t checksum;
2235 uint32_t addr = 0;
2236 uint32_t len = 0;
2237
2238 /* skip command character */
2239 packet += 5;
2240
2241 addr = strtoul(packet, &separator, 16);
2242
2243 if (*separator != ',') {
2244 LOG_ERROR("incomplete read memory packet received, dropping connection");
2245 return ERROR_SERVER_REMOTE_CLOSED;
2246 }
2247
2248 len = strtoul(separator + 1, NULL, 16);
2249
2250 retval = target_checksum_memory(target, addr, len, &checksum);
2251
2252 if (retval == ERROR_OK) {
2253 snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
2254 gdb_put_packet(connection, gdb_reply, 9);
2255 } else {
2256 retval = gdb_error(connection, retval);
2257 if (retval != ERROR_OK)
2258 return retval;
2259 }
2260
2261 return ERROR_OK;
2262 }
2263 } else if (strncmp(packet, "qSupported", 10) == 0) {
2264 /* we currently support packet size and qXfer:memory-map:read (if enabled)
2265 * qXfer:features:read is supported for some targets */
2266 int retval = ERROR_OK;
2267 char *buffer = NULL;
2268 int pos = 0;
2269 int size = 0;
2270 int gdb_target_desc_supported = 0;
2271
2272 /* we need to test that the target supports target descriptions */
2273 retval = gdb_target_description_supported(target, &gdb_target_desc_supported);
2274 if (retval != ERROR_OK) {
2275 LOG_INFO("Failed detecting Target Description Support, disabling");
2276 gdb_target_desc_supported = 0;
2277 }
2278
2279 /* support may be disabled globally */
2280 if (gdb_use_target_description == 0) {
2281 if (gdb_target_desc_supported)
2282 LOG_WARNING("Target Descriptions Supported, but disabled");
2283 gdb_target_desc_supported = 0;
2284 }
2285
2286 xml_printf(&retval,
2287 &buffer,
2288 &pos,
2289 &size,
2290 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read%c;QStartNoAckMode+",
2291 (GDB_BUFFER_SIZE - 1),
2292 ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-',
2293 (gdb_target_desc_supported == 1) ? '+' : '-');
2294
2295 if (retval != ERROR_OK) {
2296 gdb_send_error(connection, 01);
2297 return ERROR_OK;
2298 }
2299
2300 gdb_put_packet(connection, buffer, strlen(buffer));
2301 free(buffer);
2302
2303 return ERROR_OK;
2304 } else if ((strncmp(packet, "qXfer:memory-map:read::", 23) == 0)
2305 && (flash_get_bank_count() > 0))
2306 return gdb_memory_map(connection, packet, packet_size);
2307 else if (strncmp(packet, "qXfer:features:read:", 20) == 0) {
2308 char *xml = NULL;
2309 int retval = ERROR_OK;
2310
2311 int offset;
2312 unsigned int length;
2313 char *annex;
2314
2315 /* skip command character */
2316 packet += 20;
2317
2318 if (decode_xfer_read(packet, &annex, &offset, &length) < 0) {
2319 gdb_send_error(connection, 01);
2320 return ERROR_OK;
2321 }
2322
2323 /* Target should prepare correct target description for annex.
2324 * The first character of returned xml is 'm' or 'l'. 'm' for
2325 * there are *more* chunks to transfer. 'l' for it is the *last*
2326 * chunk of target description.
2327 */
2328 retval = gdb_get_target_description_chunk(target, &xml, offset, length);
2329 if (retval != ERROR_OK) {
2330 gdb_error(connection, retval);
2331 return retval;
2332 }
2333
2334 gdb_put_packet(connection, xml, strlen(xml));
2335
2336 free(xml);
2337 return ERROR_OK;
2338 } else if (strncmp(packet, "QStartNoAckMode", 15) == 0) {
2339 gdb_connection->noack_mode = 1;
2340 gdb_put_packet(connection, "OK", 2);
2341 return ERROR_OK;
2342 }
2343
2344 gdb_put_packet(connection, "", 0);
2345 return ERROR_OK;
2346 }
2347
2348 static int gdb_v_packet(struct connection *connection,
2349 char *packet, int packet_size)
2350 {
2351 struct gdb_connection *gdb_connection = connection->priv;
2352 struct gdb_service *gdb_service = connection->service->priv;
2353 int result;
2354
2355 /* if flash programming disabled - send a empty reply */
2356
2357 if (gdb_flash_program == 0) {
2358 gdb_put_packet(connection, "", 0);
2359 return ERROR_OK;
2360 }
2361
2362 if (strncmp(packet, "vFlashErase:", 12) == 0) {
2363 unsigned long addr;
2364 unsigned long length;
2365
2366 char *parse = packet + 12;
2367 if (*parse == '\0') {
2368 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2369 return ERROR_SERVER_REMOTE_CLOSED;
2370 }
2371
2372 addr = strtoul(parse, &parse, 16);
2373
2374 if (*(parse++) != ',' || *parse == '\0') {
2375 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2376 return ERROR_SERVER_REMOTE_CLOSED;
2377 }
2378
2379 length = strtoul(parse, &parse, 16);
2380
2381 if (*parse != '\0') {
2382 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2383 return ERROR_SERVER_REMOTE_CLOSED;
2384 }
2385
2386 /* assume all sectors need erasing - stops any problems
2387 * when flash_write is called multiple times */
2388 flash_set_dirty();
2389
2390 /* perform any target specific operations before the erase */
2391 target_call_event_callbacks(gdb_service->target,
2392 TARGET_EVENT_GDB_FLASH_ERASE_START);
2393
2394 /* vFlashErase:addr,length messages require region start and
2395 * end to be "block" aligned ... if padding is ever needed,
2396 * GDB will have become dangerously confused.
2397 */
2398 result = flash_erase_address_range(gdb_service->target,
2399 false, addr, length);
2400
2401 /* perform any target specific operations after the erase */
2402 target_call_event_callbacks(gdb_service->target,
2403 TARGET_EVENT_GDB_FLASH_ERASE_END);
2404
2405 /* perform erase */
2406 if (result != ERROR_OK) {
2407 /* GDB doesn't evaluate the actual error number returned,
2408 * treat a failed erase as an I/O error
2409 */
2410 gdb_send_error(connection, EIO);
2411 LOG_ERROR("flash_erase returned %i", result);
2412 } else
2413 gdb_put_packet(connection, "OK", 2);
2414
2415 return ERROR_OK;
2416 }
2417
2418 if (strncmp(packet, "vFlashWrite:", 12) == 0) {
2419 int retval;
2420 unsigned long addr;
2421 unsigned long length;
2422 char *parse = packet + 12;
2423
2424 if (*parse == '\0') {
2425 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2426 return ERROR_SERVER_REMOTE_CLOSED;
2427 }
2428 addr = strtoul(parse, &parse, 16);
2429 if (*(parse++) != ':') {
2430 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2431 return ERROR_SERVER_REMOTE_CLOSED;
2432 }
2433 length = packet_size - (parse - packet);
2434
2435 /* create a new image if there isn't already one */
2436 if (gdb_connection->vflash_image == NULL) {
2437 gdb_connection->vflash_image = malloc(sizeof(struct image));
2438 image_open(gdb_connection->vflash_image, "", "build");
2439 }
2440
2441 /* create new section with content from packet buffer */
2442 retval = image_add_section(gdb_connection->vflash_image,
2443 addr, length, 0x0, (uint8_t *)parse);
2444 if (retval != ERROR_OK)
2445 return retval;
2446
2447 gdb_put_packet(connection, "OK", 2);
2448
2449 return ERROR_OK;
2450 }
2451
2452 if (strncmp(packet, "vFlashDone", 10) == 0) {
2453 uint32_t written;
2454
2455 /* process the flashing buffer. No need to erase as GDB
2456 * always issues a vFlashErase first. */
2457 target_call_event_callbacks(gdb_service->target,
2458 TARGET_EVENT_GDB_FLASH_WRITE_START);
2459 result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
2460 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
2461 if (result != ERROR_OK) {
2462 if (result == ERROR_FLASH_DST_OUT_OF_BANK)
2463 gdb_put_packet(connection, "E.memtype", 9);
2464 else
2465 gdb_send_error(connection, EIO);
2466 } else {
2467 LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
2468 gdb_put_packet(connection, "OK", 2);
2469 }
2470
2471 image_close(gdb_connection->vflash_image);
2472 free(gdb_connection->vflash_image);
2473 gdb_connection->vflash_image = NULL;
2474
2475 return ERROR_OK;
2476 }
2477
2478 gdb_put_packet(connection, "", 0);
2479 return ERROR_OK;
2480 }
2481
2482 static int gdb_detach(struct connection *connection)
2483 {
2484 struct gdb_service *gdb_service = connection->service->priv;
2485
2486 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
2487
2488 return gdb_put_packet(connection, "OK", 2);
2489 }
2490
2491 /* The format of 'F' response packet is
2492 * Fretcode,errno,Ctrl-C flag;call-specific attachment
2493 */
2494 static int gdb_fileio_response_packet(struct connection *connection,
2495 char *packet, int packet_size)
2496 {
2497 struct target *target = get_target_from_connection(connection);
2498 char *separator;
2499 char *parsing_point;
2500 int fileio_retcode = strtoul(packet + 1, &separator, 16);
2501 int fileio_errno = 0;
2502 bool fileio_ctrl_c = false;
2503 int retval;
2504
2505 LOG_DEBUG("-");
2506
2507 if (*separator == ',') {
2508 parsing_point = separator + 1;
2509 fileio_errno = strtoul(parsing_point, &separator, 16);
2510 if (*separator == ',') {
2511 if (*(separator + 1) == 'C') {
2512 /* TODO: process ctrl-c */
2513 fileio_ctrl_c = true;
2514 }
2515 }
2516 }
2517
2518 LOG_DEBUG("File-I/O response, retcode: 0x%x, errno: 0x%x, ctrl-c: %s",
2519 fileio_retcode, fileio_errno, fileio_ctrl_c ? "true" : "false");
2520
2521 retval = target_gdb_fileio_end(target, fileio_retcode, fileio_errno, fileio_ctrl_c);
2522 if (retval != ERROR_OK)
2523 return ERROR_FAIL;
2524
2525 /* After File-I/O ends, keep continue or step */
2526 if (gdb_running_type == 'c')
2527 retval = target_resume(target, 1, 0x0, 0, 0);
2528 else if (gdb_running_type == 's')
2529 retval = target_step(target, 1, 0x0, 0);
2530 else
2531 retval = ERROR_FAIL;
2532
2533 if (retval != ERROR_OK)
2534 return ERROR_FAIL;
2535
2536 return ERROR_OK;
2537 }
2538
2539 static void gdb_log_callback(void *priv, const char *file, unsigned line,
2540 const char *function, const char *string)
2541 {
2542 struct connection *connection = priv;
2543 struct gdb_connection *gdb_con = connection->priv;
2544
2545 if (gdb_con->busy) {
2546 /* do not reply this using the O packet */
2547 return;
2548 }
2549
2550 gdb_output_con(connection, string);
2551 }
2552
2553 static void gdb_sig_halted(struct connection *connection)
2554 {
2555 char sig_reply[4];
2556 snprintf(sig_reply, 4, "T%2.2x", 2);
2557 gdb_put_packet(connection, sig_reply, 3);
2558 }
2559
2560 static int gdb_input_inner(struct connection *connection)
2561 {
2562 /* Do not allocate this on the stack */
2563 static char gdb_packet_buffer[GDB_BUFFER_SIZE];
2564
2565 struct gdb_service *gdb_service = connection->service->priv;
2566 struct target *target = gdb_service->target;
2567 char *packet = gdb_packet_buffer;
2568 int packet_size;
2569 int retval;
2570 struct gdb_connection *gdb_con = connection->priv;
2571 static int extended_protocol;
2572
2573 /* drain input buffer. If one of the packets fail, then an error
2574 * packet is replied, if applicable.
2575 *
2576 * This loop will terminate and the error code is returned.
2577 *
2578 * The calling fn will check if this error is something that
2579 * can be recovered from, or if the connection must be closed.
2580 *
2581 * If the error is recoverable, this fn is called again to
2582 * drain the rest of the buffer.
2583 */
2584 do {
2585 packet_size = GDB_BUFFER_SIZE-1;
2586 retval = gdb_get_packet(connection, packet, &packet_size);
2587 if (retval != ERROR_OK)
2588 return retval;
2589
2590 /* terminate with zero */
2591 packet[packet_size] = 0;
2592
2593 if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
2594 if (packet[0] == 'X') {
2595 /* binary packets spew junk into the debug log stream */
2596 char buf[50];
2597 int x;
2598 for (x = 0; (x < 49) && (packet[x] != ':'); x++)
2599 buf[x] = packet[x];
2600 buf[x] = 0;
2601 LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
2602 } else
2603 LOG_DEBUG("received packet: '%s'", packet);
2604 }
2605
2606 if (packet_size > 0) {
2607 retval = ERROR_OK;
2608 switch (packet[0]) {
2609 case 'T': /* Is thread alive? */
2610 gdb_thread_packet(connection, packet, packet_size);
2611 break;
2612 case 'H': /* Set current thread ( 'c' for step and continue,
2613 * 'g' for all other operations ) */
2614 gdb_thread_packet(connection, packet, packet_size);
2615 break;
2616 case 'q':
2617 case 'Q':
2618 retval = gdb_thread_packet(connection, packet, packet_size);
2619 if (retval == GDB_THREAD_PACKET_NOT_CONSUMED)
2620 retval = gdb_query_packet(connection, packet, packet_size);
2621 break;
2622 case 'g':
2623 retval = gdb_get_registers_packet(connection, packet, packet_size);
2624 break;
2625 case 'G':
2626 retval = gdb_set_registers_packet(connection, packet, packet_size);
2627 break;
2628 case 'p':
2629 retval = gdb_get_register_packet(connection, packet, packet_size);
2630 break;
2631 case 'P':
2632 retval = gdb_set_register_packet(connection, packet, packet_size);
2633 break;
2634 case 'm':
2635 retval = gdb_read_memory_packet(connection, packet, packet_size);
2636 break;
2637 case 'M':
2638 retval = gdb_write_memory_packet(connection, packet, packet_size);
2639 break;
2640 case 'z':
2641 case 'Z':
2642 retval = gdb_breakpoint_watchpoint_packet(connection, packet, packet_size);
2643 break;
2644 case '?':
2645 gdb_last_signal_packet(connection, packet, packet_size);
2646 break;
2647 case 'c':
2648 case 's':
2649 {
2650 gdb_thread_packet(connection, packet, packet_size);
2651 log_add_callback(gdb_log_callback, connection);
2652
2653 if (gdb_con->mem_write_error) {
2654 LOG_ERROR("Memory write failure!");
2655
2656 /* now that we have reported the memory write error,
2657 * we can clear the condition */
2658 gdb_con->mem_write_error = false;
2659 }
2660
2661 bool nostep = false;
2662 bool already_running = false;
2663 if (target->state == TARGET_RUNNING) {
2664 LOG_WARNING("WARNING! The target is already running. "
2665 "All changes GDB did to registers will be discarded! "
2666 "Waiting for target to halt.");
2667 already_running = true;
2668 } else if (target->state != TARGET_HALTED) {
2669 LOG_WARNING("The target is not in the halted nor running stated, " \
2670 "stepi/continue ignored.");
2671 nostep = true;
2672 } else if ((packet[0] == 's') && gdb_con->sync) {
2673 /* Hmm..... when you issue a continue in GDB, then a "stepi" is
2674 * sent by GDB first to OpenOCD, thus defeating the check to
2675 * make only the single stepping have the sync feature...
2676 */
2677 nostep = true;
2678 LOG_WARNING("stepi ignored. GDB will now fetch the register state " \
2679 "from the target.");
2680 }
2681 gdb_con->sync = false;
2682
2683 if (!already_running && nostep) {
2684 /* Either the target isn't in the halted state, then we can't
2685 * step/continue. This might be early setup, etc.
2686 *
2687 * Or we want to allow GDB to pick up a fresh set of
2688 * register values without modifying the target state.
2689 *
2690 */
2691 gdb_sig_halted(connection);
2692
2693 /* stop forwarding log packets! */
2694 log_remove_callback(gdb_log_callback, connection);
2695 } else {
2696 /* We're running/stepping, in which case we can
2697 * forward log output until the target is halted
2698 */
2699 gdb_con->frontend_state = TARGET_RUNNING;
2700 target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
2701
2702 if (!already_running) {
2703 /* Here we don't want packet processing to stop even if this fails,
2704 * so we use a local variable instead of retval. */
2705 retval = gdb_step_continue_packet(connection, packet, packet_size);
2706 if (retval != ERROR_OK) {
2707 /* we'll never receive a halted
2708 * condition... issue a false one..
2709 */
2710 gdb_frontend_halted(target, connection);
2711 }
2712 }
2713 }
2714 }
2715 break;
2716 case 'v':
2717 retval = gdb_v_packet(connection, packet, packet_size);
2718 break;
2719 case 'D':
2720 retval = gdb_detach(connection);
2721 extended_protocol = 0;
2722 break;
2723 case 'X':
2724 retval = gdb_write_memory_binary_packet(connection, packet, packet_size);
2725 if (retval != ERROR_OK)
2726 return retval;
2727 break;
2728 case 'k':
2729 if (extended_protocol != 0) {
2730 gdb_con->attached = false;
2731 break;
2732 }
2733 gdb_put_packet(connection, "OK", 2);
2734 return ERROR_SERVER_REMOTE_CLOSED;
2735 case '!':
2736 /* handle extended remote protocol */
2737 extended_protocol = 1;
2738 gdb_put_packet(connection, "OK", 2);
2739 break;
2740 case 'R':
2741 /* handle extended restart packet */
2742 breakpoint_clear_target(gdb_service->target);
2743 watchpoint_clear_target(gdb_service->target);
2744 command_run_linef(connection->cmd_ctx, "ocd_gdb_restart %s",
2745 target_name(target));
2746 /* set connection as attached after reset */
2747 gdb_con->attached = true;
2748 /* info rtos parts */
2749 gdb_thread_packet(connection, packet, packet_size);
2750 break;
2751
2752 case 'j':
2753 /* packet supported only by smp target i.e cortex_a.c*/
2754 /* handle smp packet replying coreid played to gbd */
2755 gdb_read_smp_packet(connection, packet, packet_size);
2756 break;
2757
2758 case 'J':
2759 /* packet supported only by smp target i.e cortex_a.c */
2760 /* handle smp packet setting coreid to be played at next
2761 * resume to gdb */
2762 gdb_write_smp_packet(connection, packet, packet_size);
2763 break;
2764
2765 case 'F':
2766 /* File-I/O extension */
2767 /* After gdb uses host-side syscall to complete target file
2768 * I/O, gdb sends host-side syscall return value to target
2769 * by 'F' packet.
2770 * The format of 'F' response packet is
2771 * Fretcode,errno,Ctrl-C flag;call-specific attachment
2772 */
2773 gdb_con->frontend_state = TARGET_RUNNING;
2774 log_add_callback(gdb_log_callback, connection);
2775 gdb_fileio_response_packet(connection, packet, packet_size);
2776 break;
2777
2778 default:
2779 /* ignore unknown packets */
2780 LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
2781 gdb_put_packet(connection, NULL, 0);
2782 break;
2783 }
2784
2785 /* if a packet handler returned an error, exit input loop */
2786 if (retval != ERROR_OK)
2787 return retval;
2788 }
2789
2790 if (gdb_con->ctrl_c) {
2791 if (target->state == TARGET_RUNNING) {
2792 retval = target_halt(target);
2793 if (retval != ERROR_OK)
2794 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2795 gdb_con->ctrl_c = 0;
2796 } else {
2797 LOG_INFO("The target is not running when halt was requested, stopping GDB.");
2798 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2799 }
2800 }
2801
2802 } while (gdb_con->buf_cnt > 0);
2803
2804 return ERROR_OK;
2805 }
2806
2807 static int gdb_input(struct connection *connection)
2808 {
2809 int retval = gdb_input_inner(connection);
2810 struct gdb_connection *gdb_con = connection->priv;
2811 if (retval == ERROR_SERVER_REMOTE_CLOSED)
2812 return retval;
2813
2814 /* logging does not propagate the error, yet can set the gdb_con->closed flag */
2815 if (gdb_con->closed)
2816 return ERROR_SERVER_REMOTE_CLOSED;
2817
2818 /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
2819 return ERROR_OK;
2820 }
2821
2822 static int gdb_target_start(struct target *target, const char *port)
2823 {
2824 struct gdb_service *gdb_service;
2825 int ret;
2826 gdb_service = malloc(sizeof(struct gdb_service));
2827
2828 if (NULL == gdb_service)
2829 return -ENOMEM;
2830
2831 gdb_service->target = target;
2832 gdb_service->core[0] = -1;
2833 gdb_service->core[1] = -1;
2834 target->gdb_service = gdb_service;
2835
2836 ret = add_service("gdb",
2837 port, 1, &gdb_new_connection, &gdb_input,
2838 &gdb_connection_closed, gdb_service);
2839 /* initialialize all targets gdb service with the same pointer */
2840 {
2841 struct target_list *head;
2842 struct target *curr;
2843 head = target->head;
2844 while (head != (struct target_list *)NULL) {
2845 curr = head->target;
2846 if (curr != target)
2847 curr->gdb_service = gdb_service;
2848 head = head->next;
2849 }
2850 }
2851 return ret;
2852 }
2853
2854 static int gdb_target_add_one(struct target *target)
2855 {
2856 /* one gdb instance per smp list */
2857 if ((target->smp) && (target->gdb_service))
2858 return ERROR_OK;
2859 int retval = gdb_target_start(target, gdb_port_next);
2860 if (retval == ERROR_OK) {
2861 long portnumber;
2862 /* If we can parse the port number
2863 * then we increment the port number for the next target.
2864 */
2865 char *end;
2866 portnumber = strtol(gdb_port_next, &end, 0);
2867 if (!*end) {
2868 if (parse_long(gdb_port_next, &portnumber) == ERROR_OK) {
2869 free((void *)gdb_port_next);
2870 gdb_port_next = alloc_printf("%d", portnumber+1);
2871 }
2872 }
2873 }
2874 return retval;
2875 }
2876
2877 int gdb_target_add_all(struct target *target)
2878 {
2879 if (NULL == target) {
2880 LOG_WARNING("gdb services need one or more targets defined");
2881 return ERROR_OK;
2882 }
2883
2884 while (NULL != target) {
2885 int retval = gdb_target_add_one(target);
2886 if (ERROR_OK != retval)
2887 return retval;
2888
2889 target = target->next;
2890 }
2891
2892 return ERROR_OK;
2893 }
2894
2895 COMMAND_HANDLER(handle_gdb_sync_command)
2896 {
2897 if (CMD_ARGC != 0)
2898 return ERROR_COMMAND_SYNTAX_ERROR;
2899
2900 if (current_gdb_connection == NULL) {
2901 command_print(CMD_CTX,
2902 "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
2903 return ERROR_FAIL;
2904 }
2905
2906 current_gdb_connection->sync = true;
2907
2908 return ERROR_OK;
2909 }
2910
2911 /* daemon configuration command gdb_port */
2912 COMMAND_HANDLER(handle_gdb_port_command)
2913 {
2914 int retval = CALL_COMMAND_HANDLER(server_pipe_command, &gdb_port);
2915 if (ERROR_OK == retval) {
2916 free((void *)gdb_port_next);
2917 gdb_port_next = strdup(gdb_port);
2918 }
2919 return retval;
2920 }
2921
2922 COMMAND_HANDLER(handle_gdb_memory_map_command)
2923 {
2924 if (CMD_ARGC != 1)
2925 return ERROR_COMMAND_SYNTAX_ERROR;
2926
2927 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map);
2928 return ERROR_OK;
2929 }
2930
2931 COMMAND_HANDLER(handle_gdb_flash_program_command)
2932 {
2933 if (CMD_ARGC != 1)
2934 return ERROR_COMMAND_SYNTAX_ERROR;
2935
2936 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program);
2937 return ERROR_OK;
2938 }
2939
2940 COMMAND_HANDLER(handle_gdb_report_data_abort_command)
2941 {
2942 if (CMD_ARGC != 1)
2943 return ERROR_COMMAND_SYNTAX_ERROR;
2944
2945 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort);
2946 return ERROR_OK;
2947 }
2948
2949 /* gdb_breakpoint_override */
2950 COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
2951 {
2952 if (CMD_ARGC == 0) {
2953 /* nothing */
2954 } else if (CMD_ARGC == 1) {
2955 gdb_breakpoint_override = 1;
2956 if (strcmp(CMD_ARGV[0], "hard") == 0)
2957 gdb_breakpoint_override_type = BKPT_HARD;
2958 else if (strcmp(CMD_ARGV[0], "soft") == 0)
2959 gdb_breakpoint_override_type = BKPT_SOFT;
2960 else if (strcmp(CMD_ARGV[0], "disable") == 0)
2961 gdb_breakpoint_override = 0;
2962 } else
2963 return ERROR_COMMAND_SYNTAX_ERROR;
2964 if (gdb_breakpoint_override)
2965 LOG_USER("force %s breakpoints",
2966 (gdb_breakpoint_override_type == BKPT_HARD) ? "hard" : "soft");
2967 else
2968 LOG_USER("breakpoint type is not overridden");
2969
2970 return ERROR_OK;
2971 }
2972
2973 COMMAND_HANDLER(handle_gdb_target_description_command)
2974 {
2975 if (CMD_ARGC != 1)
2976 return ERROR_COMMAND_SYNTAX_ERROR;
2977
2978 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_target_description);
2979 return ERROR_OK;
2980 }
2981
2982 COMMAND_HANDLER(handle_gdb_save_tdesc_command)
2983 {
2984 static char *tdesc;
2985 static uint32_t tdesc_length;
2986 struct target *target = get_current_target(CMD_CTX);
2987 char *tdesc_filename;
2988
2989 if (tdesc == NULL) {
2990 gdb_generate_target_description(target, &tdesc);
2991 tdesc_length = strlen(tdesc);
2992 }
2993
2994 struct fileio fileio;
2995 size_t size_written;
2996
2997 tdesc_filename = malloc(strlen(target_type_name(target)) + 5);
2998 sprintf(tdesc_filename, "%s.xml", target_type_name(target));
2999
3000 int retval = fileio_open(&fileio, tdesc_filename, FILEIO_WRITE, FILEIO_TEXT);
3001
3002 if (retval != ERROR_OK) {
3003 LOG_WARNING("Can't open %s for writing", tdesc_filename);
3004 free(tdesc_filename);
3005 return ERROR_FAIL;
3006 }
3007
3008 retval = fileio_write(&fileio, tdesc_length, tdesc, &size_written);
3009
3010 fileio_close(&fileio);
3011 free(tdesc_filename);
3012
3013 if (retval != ERROR_OK) {
3014 LOG_WARNING("Error while writing the tdesc file");
3015 return ERROR_FAIL;
3016 }
3017
3018 return ERROR_OK;
3019 }
3020
3021 static const struct command_registration gdb_command_handlers[] = {
3022 {
3023 .name = "gdb_sync",
3024 .handler = handle_gdb_sync_command,
3025 .mode = COMMAND_ANY,
3026 .help = "next stepi will return immediately allowing "
3027 "GDB to fetch register state without affecting "
3028 "target state",
3029 .usage = ""
3030 },
3031 {
3032 .name = "gdb_port",
3033 .handler = handle_gdb_port_command,
3034 .mode = COMMAND_ANY,
3035 .help = "Normally gdb listens to a TCP/IP port. Each subsequent GDB "
3036 "server listens for the next port number after the "
3037 "base port number specified. "
3038 "No arguments reports GDB port. \"pipe\" means listen to stdin "
3039 "output to stdout, an integer is base port number, \"disable\" disables "
3040 "port. Any other string is are interpreted as named pipe to listen to. "
3041 "Output pipe is the same name as input pipe, but with 'o' appended.",
3042 .usage = "[port_num]",
3043 },
3044 {
3045 .name = "gdb_memory_map",
3046 .handler = handle_gdb_memory_map_command,
3047 .mode = COMMAND_CONFIG,
3048 .help = "enable or disable memory map",
3049 .usage = "('enable'|'disable')"
3050 },
3051 {
3052 .name = "gdb_flash_program",
3053 .handler = handle_gdb_flash_program_command,
3054 .mode = COMMAND_CONFIG,
3055 .help = "enable or disable flash program",
3056 .usage = "('enable'|'disable')"
3057 },
3058 {
3059 .name = "gdb_report_data_abort",
3060 .handler = handle_gdb_report_data_abort_command,
3061 .mode = COMMAND_CONFIG,
3062 .help = "enable or disable reporting data aborts",
3063 .usage = "('enable'|'disable')"
3064 },
3065 {
3066 .name = "gdb_breakpoint_override",
3067 .handler = handle_gdb_breakpoint_override_command,
3068 .mode = COMMAND_ANY,
3069 .help = "Display or specify type of breakpoint "
3070 "to be used by gdb 'break' commands.",
3071 .usage = "('hard'|'soft'|'disable')"
3072 },
3073 {
3074 .name = "gdb_target_description",
3075 .handler = handle_gdb_target_description_command,
3076 .mode = COMMAND_CONFIG,
3077 .help = "enable or disable target description",
3078 .usage = "('enable'|'disable')"
3079 },
3080 {
3081 .name = "gdb_save_tdesc",
3082 .handler = handle_gdb_save_tdesc_command,
3083 .mode = COMMAND_EXEC,
3084 .help = "Save the target description file",
3085 },
3086 COMMAND_REGISTRATION_DONE
3087 };
3088
3089 int gdb_register_commands(struct command_context *cmd_ctx)
3090 {
3091 gdb_port = strdup("3333");
3092 gdb_port_next = strdup("3333");
3093 return register_commands(cmd_ctx, NULL, gdb_command_handlers);
3094 }
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