?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
gdb_server: Fix confusing warning when entering noack mode
[openocd.git] / src / server / gdb_server.c
blob7bf7319c54cc60b338951f953890d1a457bb357f
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 struct target_desc_format {
64 char *tdesc;
65 uint32_t tdesc_length;
66 };
67
68 /* private connection data for GDB */
69 struct gdb_connection {
70 char buffer[GDB_BUFFER_SIZE];
71 char *buf_p;
72 int buf_cnt;
73 int ctrl_c;
74 enum target_state frontend_state;
75 struct image *vflash_image;
76 int closed;
77 int busy;
78 int noack_mode;
79 /* set flag to true if you want the next stepi to return immediately.
80 * allowing GDB to pick up a fresh set of register values from the target
81 * without modifying the target state. */
82 bool sync;
83 /* We delay reporting memory write errors until next step/continue or memory
84 * write. This improves performance of gdb load significantly as the GDB packet
85 * can be replied immediately and a new GDB packet will be ready without delay
86 * (ca. 10% or so...). */
87 bool mem_write_error;
88 /* with extended-remote it seems we need to better emulate attach/detach.
89 * what this means is we reply with a W stop reply after a kill packet,
90 * normally we reply with a S reply via gdb_last_signal_packet.
91 * as a side note this behaviour only effects gdb > 6.8 */
92 bool attached;
93 /* temporarily used for target description support */
94 struct target_desc_format target_desc;
95 };
96
97 #if 0
98 #define _DEBUG_GDB_IO_
99 #endif
100
101 static struct gdb_connection *current_gdb_connection;
102
103 static int gdb_breakpoint_override;
104 static enum breakpoint_type gdb_breakpoint_override_type;
105
106 static int gdb_error(struct connection *connection, int retval);
107 static char *gdb_port;
108 static char *gdb_port_next;
109
110 static void gdb_log_callback(void *priv, const char *file, unsigned line,
111 const char *function, const char *string);
112
113 /* number of gdb connections, mainly to suppress gdb related debugging spam
114 * in helper/log.c when no gdb connections are actually active */
115 int gdb_actual_connections;
116
117 /* set if we are sending a memory map to gdb
118 * via qXfer:memory-map:read packet */
119 /* enabled by default*/
120 static int gdb_use_memory_map = 1;
121 /* enabled by default*/
122 static int gdb_flash_program = 1;
123
124 /* if set, data aborts cause an error to be reported in memory read packets
125 * see the code in gdb_read_memory_packet() for further explanations.
126 * Disabled by default.
127 */
128 static int gdb_report_data_abort;
129
130 /* set if we are sending target descriptions to gdb
131 * via qXfer:features:read packet */
132 /* enabled by default */
133 static int gdb_use_target_description = 1;
134
135 /* current processing free-run type, used by file-I/O */
136 static char gdb_running_type;
137
138 static int gdb_last_signal(struct target *target)
139 {
140 switch (target->debug_reason) {
141 case DBG_REASON_DBGRQ:
142 return 0x2; /* SIGINT */
143 case DBG_REASON_BREAKPOINT:
144 case DBG_REASON_WATCHPOINT:
145 case DBG_REASON_WPTANDBKPT:
146 return 0x05; /* SIGTRAP */
147 case DBG_REASON_SINGLESTEP:
148 return 0x05; /* SIGTRAP */
149 case DBG_REASON_NOTHALTED:
150 return 0x0; /* no signal... shouldn't happen */
151 default:
152 LOG_USER("undefined debug reason %d - target needs reset",
153 target->debug_reason);
154 return 0x0;
155 }
156 }
157
158 static int check_pending(struct connection *connection,
159 int timeout_s, int *got_data)
160 {
161 /* a non-blocking socket will block if there is 0 bytes available on the socket,
162 * but return with as many bytes as are available immediately
163 */
164 struct timeval tv;
165 fd_set read_fds;
166 struct gdb_connection *gdb_con = connection->priv;
167 int t;
168 if (got_data == NULL)
169 got_data = &t;
170 *got_data = 0;
171
172 if (gdb_con->buf_cnt > 0) {
173 *got_data = 1;
174 return ERROR_OK;
175 }
176
177 FD_ZERO(&read_fds);
178 FD_SET(connection->fd, &read_fds);
179
180 tv.tv_sec = timeout_s;
181 tv.tv_usec = 0;
182 if (socket_select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0) {
183 /* This can typically be because a "monitor" command took too long
184 * before printing any progress messages
185 */
186 if (timeout_s > 0)
187 return ERROR_GDB_TIMEOUT;
188 else
189 return ERROR_OK;
190 }
191 *got_data = FD_ISSET(connection->fd, &read_fds) != 0;
192 return ERROR_OK;
193 }
194
195 static int gdb_get_char_inner(struct connection *connection, int *next_char)
196 {
197 struct gdb_connection *gdb_con = connection->priv;
198 int retval = ERROR_OK;
199
200 #ifdef _DEBUG_GDB_IO_
201 char *debug_buffer;
202 #endif
203 for (;; ) {
204 if (connection->service->type != CONNECTION_TCP)
205 gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
206 else {
207 retval = check_pending(connection, 1, NULL);
208 if (retval != ERROR_OK)
209 return retval;
210 gdb_con->buf_cnt = read_socket(connection->fd,
211 gdb_con->buffer,
212 GDB_BUFFER_SIZE);
213 }
214
215 if (gdb_con->buf_cnt > 0)
216 break;
217 if (gdb_con->buf_cnt == 0) {
218 gdb_con->closed = 1;
219 return ERROR_SERVER_REMOTE_CLOSED;
220 }
221
222 #ifdef _WIN32
223 errno = WSAGetLastError();
224
225 switch (errno) {
226 case WSAEWOULDBLOCK:
227 usleep(1000);
228 break;
229 case WSAECONNABORTED:
230 gdb_con->closed = 1;
231 return ERROR_SERVER_REMOTE_CLOSED;
232 case WSAECONNRESET:
233 gdb_con->closed = 1;
234 return ERROR_SERVER_REMOTE_CLOSED;
235 default:
236 LOG_ERROR("read: %d", errno);
237 exit(-1);
238 }
239 #else
240 switch (errno) {
241 case EAGAIN:
242 usleep(1000);
243 break;
244 case ECONNABORTED:
245 gdb_con->closed = 1;
246 return ERROR_SERVER_REMOTE_CLOSED;
247 case ECONNRESET:
248 gdb_con->closed = 1;
249 return ERROR_SERVER_REMOTE_CLOSED;
250 default:
251 LOG_ERROR("read: %s", strerror(errno));
252 gdb_con->closed = 1;
253 return ERROR_SERVER_REMOTE_CLOSED;
254 }
255 #endif
256 }
257
258 #ifdef _DEBUG_GDB_IO_
259 debug_buffer = strndup(gdb_con->buffer, gdb_con->buf_cnt);
260 LOG_DEBUG("received '%s'", debug_buffer);
261 free(debug_buffer);
262 #endif
263
264 gdb_con->buf_p = gdb_con->buffer;
265 gdb_con->buf_cnt--;
266 *next_char = *(gdb_con->buf_p++);
267 if (gdb_con->buf_cnt > 0)
268 connection->input_pending = 1;
269 else
270 connection->input_pending = 0;
271 #ifdef _DEBUG_GDB_IO_
272 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
273 #endif
274
275 return retval;
276 }
277
278 /**
279 * The cool thing about this fn is that it allows buf_p and buf_cnt to be
280 * held in registers in the inner loop.
281 *
282 * For small caches and embedded systems this is important!
283 */
284 static inline int gdb_get_char_fast(struct connection *connection,
285 int *next_char, char **buf_p, int *buf_cnt)
286 {
287 int retval = ERROR_OK;
288
289 if ((*buf_cnt)-- > 0) {
290 *next_char = **buf_p;
291 (*buf_p)++;
292 if (*buf_cnt > 0)
293 connection->input_pending = 1;
294 else
295 connection->input_pending = 0;
296
297 #ifdef _DEBUG_GDB_IO_
298 LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
299 #endif
300
301 return ERROR_OK;
302 }
303
304 struct gdb_connection *gdb_con = connection->priv;
305 gdb_con->buf_p = *buf_p;
306 gdb_con->buf_cnt = *buf_cnt;
307 retval = gdb_get_char_inner(connection, next_char);
308 *buf_p = gdb_con->buf_p;
309 *buf_cnt = gdb_con->buf_cnt;
310
311 return retval;
312 }
313
314 static int gdb_get_char(struct connection *connection, int *next_char)
315 {
316 struct gdb_connection *gdb_con = connection->priv;
317 return gdb_get_char_fast(connection, next_char, &gdb_con->buf_p, &gdb_con->buf_cnt);
318 }
319
320 static int gdb_putback_char(struct connection *connection, int last_char)
321 {
322 struct gdb_connection *gdb_con = connection->priv;
323
324 if (gdb_con->buf_p > gdb_con->buffer) {
325 *(--gdb_con->buf_p) = last_char;
326 gdb_con->buf_cnt++;
327 } else
328 LOG_ERROR("BUG: couldn't put character back");
329
330 return ERROR_OK;
331 }
332
333 /* The only way we can detect that the socket is closed is the first time
334 * we write to it, we will fail. Subsequent write operations will
335 * succeed. Shudder! */
336 static int gdb_write(struct connection *connection, void *data, int len)
337 {
338 struct gdb_connection *gdb_con = connection->priv;
339 if (gdb_con->closed)
340 return ERROR_SERVER_REMOTE_CLOSED;
341
342 if (connection_write(connection, data, len) == len)
343 return ERROR_OK;
344 gdb_con->closed = 1;
345 return ERROR_SERVER_REMOTE_CLOSED;
346 }
347
348 static int gdb_put_packet_inner(struct connection *connection,
349 char *buffer, int len)
350 {
351 int i;
352 unsigned char my_checksum = 0;
353 #ifdef _DEBUG_GDB_IO_
354 char *debug_buffer;
355 #endif
356 int reply;
357 int retval;
358 struct gdb_connection *gdb_con = connection->priv;
359
360 for (i = 0; i < len; i++)
361 my_checksum += buffer[i];
362
363 #ifdef _DEBUG_GDB_IO_
364 /*
365 * At this point we should have nothing in the input queue from GDB,
366 * however sometimes '-' is sent even though we've already received
367 * an ACK (+) for everything we've sent off.
368 */
369 int gotdata;
370 for (;; ) {
371 retval = check_pending(connection, 0, &gotdata);
372 if (retval != ERROR_OK)
373 return retval;
374 if (!gotdata)
375 break;
376 retval = gdb_get_char(connection, &reply);
377 if (retval != ERROR_OK)
378 return retval;
379 if (reply == '$') {
380 /* fix a problem with some IAR tools */
381 gdb_putback_char(connection, reply);
382 LOG_DEBUG("Unexpected start of new packet");
383 break;
384 }
385
386 LOG_WARNING("Discard unexpected char %c", reply);
387 }
388 #endif
389
390 while (1) {
391 #ifdef _DEBUG_GDB_IO_
392 debug_buffer = strndup(buffer, len);
393 LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
394 free(debug_buffer);
395 #endif
396
397 char local_buffer[1024];
398 local_buffer[0] = '$';
399 if ((size_t)len + 4 <= sizeof(local_buffer)) {
400 /* performance gain on smaller packets by only a single call to gdb_write() */
401 memcpy(local_buffer + 1, buffer, len++);
402 len += snprintf(local_buffer + len, sizeof(local_buffer) - len, "#%02x", my_checksum);
403 retval = gdb_write(connection, local_buffer, len);
404 if (retval != ERROR_OK)
405 return retval;
406 } else {
407 /* larger packets are transmitted directly from caller supplied buffer
408 * by several calls to gdb_write() to avoid dynamic allocation */
409 snprintf(local_buffer + 1, sizeof(local_buffer) - 1, "#%02x", my_checksum);
410 retval = gdb_write(connection, local_buffer, 1);
411 if (retval != ERROR_OK)
412 return retval;
413 retval = gdb_write(connection, buffer, len);
414 if (retval != ERROR_OK)
415 return retval;
416 retval = gdb_write(connection, local_buffer + 1, 3);
417 if (retval != ERROR_OK)
418 return retval;
419 }
420
421 if (gdb_con->noack_mode)
422 break;
423
424 retval = gdb_get_char(connection, &reply);
425 if (retval != ERROR_OK)
426 return retval;
427
428 if (reply == '+')
429 break;
430 else if (reply == '-') {
431 /* Stop sending output packets for now */
432 log_remove_callback(gdb_log_callback, connection);
433 LOG_WARNING("negative reply, retrying");
434 } else if (reply == 0x3) {
435 gdb_con->ctrl_c = 1;
436 retval = gdb_get_char(connection, &reply);
437 if (retval != ERROR_OK)
438 return retval;
439 if (reply == '+')
440 break;
441 else if (reply == '-') {
442 /* Stop sending output packets for now */
443 log_remove_callback(gdb_log_callback, connection);
444 LOG_WARNING("negative reply, retrying");
445 } else if (reply == '$') {
446 LOG_ERROR("GDB missing ack(1) - assumed good");
447 gdb_putback_char(connection, reply);
448 return ERROR_OK;
449 } else {
450 LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
451 gdb_con->closed = 1;
452 return ERROR_SERVER_REMOTE_CLOSED;
453 }
454 } else if (reply == '$') {
455 LOG_ERROR("GDB missing ack(2) - assumed good");
456 gdb_putback_char(connection, reply);
457 return ERROR_OK;
458 } else {
459 LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection",
460 reply);
461 gdb_con->closed = 1;
462 return ERROR_SERVER_REMOTE_CLOSED;
463 }
464 }
465 if (gdb_con->closed)
466 return ERROR_SERVER_REMOTE_CLOSED;
467
468 return ERROR_OK;
469 }
470
471 int gdb_put_packet(struct connection *connection, char *buffer, int len)
472 {
473 struct gdb_connection *gdb_con = connection->priv;
474 gdb_con->busy = 1;
475 int retval = gdb_put_packet_inner(connection, buffer, len);
476 gdb_con->busy = 0;
477
478 /* we sent some data, reset timer for keep alive messages */
479 kept_alive();
480
481 return retval;
482 }
483
484 static inline int fetch_packet(struct connection *connection,
485 int *checksum_ok, int noack, int *len, char *buffer)
486 {
487 unsigned char my_checksum = 0;
488 char checksum[3];
489 int character;
490 int retval = ERROR_OK;
491
492 struct gdb_connection *gdb_con = connection->priv;
493 my_checksum = 0;
494 int count = 0;
495 count = 0;
496
497 /* move this over into local variables to use registers and give the
498 * more freedom to optimize */
499 char *buf_p = gdb_con->buf_p;
500 int buf_cnt = gdb_con->buf_cnt;
501
502 for (;; ) {
503 /* The common case is that we have an entire packet with no escape chars.
504 * We need to leave at least 2 bytes in the buffer to have
505 * gdb_get_char() update various bits and bobs correctly.
506 */
507 if ((buf_cnt > 2) && ((buf_cnt + count) < *len)) {
508 /* The compiler will struggle a bit with constant propagation and
509 * aliasing, so we help it by showing that these values do not
510 * change inside the loop
511 */
512 int i;
513 char *buf = buf_p;
514 int run = buf_cnt - 2;
515 i = 0;
516 int done = 0;
517 while (i < run) {
518 character = *buf++;
519 i++;
520 if (character == '#') {
521 /* Danger! character can be '#' when esc is
522 * used so we need an explicit boolean for done here. */
523 done = 1;
524 break;
525 }
526
527 if (character == '}') {
528 /* data transmitted in binary mode (X packet)
529 * uses 0x7d as escape character */
530 my_checksum += character & 0xff;
531 character = *buf++;
532 i++;
533 my_checksum += character & 0xff;
534 buffer[count++] = (character ^ 0x20) & 0xff;
535 } else {
536 my_checksum += character & 0xff;
537 buffer[count++] = character & 0xff;
538 }
539 }
540 buf_p += i;
541 buf_cnt -= i;
542 if (done)
543 break;
544 }
545 if (count > *len) {
546 LOG_ERROR("packet buffer too small");
547 retval = ERROR_GDB_BUFFER_TOO_SMALL;
548 break;
549 }
550
551 retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt);
552 if (retval != ERROR_OK)
553 break;
554
555 if (character == '#')
556 break;
557
558 if (character == '}') {
559 /* data transmitted in binary mode (X packet)
560 * uses 0x7d as escape character */
561 my_checksum += character & 0xff;
562
563 retval = gdb_get_char_fast(connection, &character, &buf_p, &buf_cnt);
564 if (retval != ERROR_OK)
565 break;
566
567 my_checksum += character & 0xff;
568 buffer[count++] = (character ^ 0x20) & 0xff;
569 } else {
570 my_checksum += character & 0xff;
571 buffer[count++] = character & 0xff;
572 }
573 }
574
575 gdb_con->buf_p = buf_p;
576 gdb_con->buf_cnt = buf_cnt;
577
578 if (retval != ERROR_OK)
579 return retval;
580
581 *len = count;
582
583 retval = gdb_get_char(connection, &character);
584 if (retval != ERROR_OK)
585 return retval;
586 checksum[0] = character;
587 retval = gdb_get_char(connection, &character);
588 if (retval != ERROR_OK)
589 return retval;
590 checksum[1] = character;
591 checksum[2] = 0;
592
593 if (!noack)
594 *checksum_ok = (my_checksum == strtoul(checksum, NULL, 16));
595
596 return ERROR_OK;
597 }
598
599 static int gdb_get_packet_inner(struct connection *connection,
600 char *buffer, int *len)
601 {
602 int character;
603 int retval;
604 struct gdb_connection *gdb_con = connection->priv;
605
606 while (1) {
607 do {
608 retval = gdb_get_char(connection, &character);
609 if (retval != ERROR_OK)
610 return retval;
611
612 #ifdef _DEBUG_GDB_IO_
613 LOG_DEBUG("character: '%c'", character);
614 #endif
615
616 switch (character) {
617 case '$':
618 break;
619 case '+':
620 /* According to the GDB documentation
621 * (https://sourceware.org/gdb/onlinedocs/gdb/Packet-Acknowledgment.html):
622 * "gdb sends a final `+` acknowledgment of the stub's `OK`
623 * response, which can be safely ignored by the stub."
624 * However OpenOCD server already is in noack mode at this
625 * point and instead of ignoring this it was emitting a
626 * warning. This code makes server ignore the first ACK
627 * that will be received after going into noack mode,
628 * warning only about subsequent ACK's. */
629 if (gdb_con->noack_mode > 1) {
630 LOG_WARNING("acknowledgment received, but no packet pending");
631 } else {
632 LOG_DEBUG("Received first acknowledgment after entering noack mode. Ignoring it.");
633 gdb_con->noack_mode = 2;
634 }
635 break;
636 case '-':
637 LOG_WARNING("negative acknowledgment, but no packet pending");
638 break;
639 case 0x3:
640 gdb_con->ctrl_c = 1;
641 *len = 0;
642 return ERROR_OK;
643 default:
644 LOG_WARNING("ignoring character 0x%x", character);
645 break;
646 }
647 } while (character != '$');
648
649 int checksum_ok = 0;
650 /* explicit code expansion here to get faster inlined code in -O3 by not
651 * calculating checksum */
652 if (gdb_con->noack_mode) {
653 retval = fetch_packet(connection, &checksum_ok, 1, len, buffer);
654 if (retval != ERROR_OK)
655 return retval;
656 } else {
657 retval = fetch_packet(connection, &checksum_ok, 0, len, buffer);
658 if (retval != ERROR_OK)
659 return retval;
660 }
661
662 if (gdb_con->noack_mode) {
663 /* checksum is not checked in noack mode */
664 break;
665 }
666 if (checksum_ok) {
667 retval = gdb_write(connection, "+", 1);
668 if (retval != ERROR_OK)
669 return retval;
670 break;
671 }
672 }
673 if (gdb_con->closed)
674 return ERROR_SERVER_REMOTE_CLOSED;
675
676 return ERROR_OK;
677 }
678
679 static int gdb_get_packet(struct connection *connection, char *buffer, int *len)
680 {
681 struct gdb_connection *gdb_con = connection->priv;
682 gdb_con->busy = 1;
683 int retval = gdb_get_packet_inner(connection, buffer, len);
684 gdb_con->busy = 0;
685 return retval;
686 }
687
688 static int gdb_output_con(struct connection *connection, const char *line)
689 {
690 char *hex_buffer;
691 int bin_size;
692
693 bin_size = strlen(line);
694
695 hex_buffer = malloc(bin_size * 2 + 2);
696 if (hex_buffer == NULL)
697 return ERROR_GDB_BUFFER_TOO_SMALL;
698
699 hex_buffer[0] = 'O';
700 int pkt_len = hexify(hex_buffer + 1, line, bin_size, bin_size * 2 + 1);
701 int retval = gdb_put_packet(connection, hex_buffer, pkt_len + 1);
702
703 free(hex_buffer);
704 return retval;
705 }
706
707 static int gdb_output(struct command_context *context, const char *line)
708 {
709 /* this will be dumped to the log and also sent as an O packet if possible */
710 LOG_USER_N("%s", line);
711 return ERROR_OK;
712 }
713
714 static void gdb_signal_reply(struct target *target, struct connection *connection)
715 {
716 struct gdb_connection *gdb_connection = connection->priv;
717 char sig_reply[20];
718 char stop_reason[20];
719 int sig_reply_len;
720 int signal_var;
721
722 if (target->debug_reason == DBG_REASON_EXIT) {
723 sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "W00");
724 } else {
725 if (gdb_connection->ctrl_c) {
726 signal_var = 0x2;
727 gdb_connection->ctrl_c = 0;
728 } else
729 signal_var = gdb_last_signal(target);
730
731 stop_reason[0] = '\0';
732 if (target->debug_reason == DBG_REASON_WATCHPOINT) {
733 enum watchpoint_rw hit_wp_type;
734 uint32_t hit_wp_address;
735
736 if (watchpoint_hit(target, &hit_wp_type, &hit_wp_address) == ERROR_OK) {
737
738 switch (hit_wp_type) {
739 case WPT_WRITE:
740 snprintf(stop_reason, sizeof(stop_reason),
741 "watch:%08" PRIx32 ";", hit_wp_address);
742 break;
743 case WPT_READ:
744 snprintf(stop_reason, sizeof(stop_reason),
745 "rwatch:%08" PRIx32 ";", hit_wp_address);
746 break;
747 case WPT_ACCESS:
748 snprintf(stop_reason, sizeof(stop_reason),
749 "awatch:%08" PRIx32 ";", hit_wp_address);
750 break;
751 default:
752 break;
753 }
754 }
755 }
756
757 sig_reply_len = snprintf(sig_reply, sizeof(sig_reply), "T%2.2x%s",
758 signal_var, stop_reason);
759 }
760
761 gdb_put_packet(connection, sig_reply, sig_reply_len);
762 gdb_connection->frontend_state = TARGET_HALTED;
763 rtos_update_threads(target);
764 }
765
766 static void gdb_fileio_reply(struct target *target, struct connection *connection)
767 {
768 struct gdb_connection *gdb_connection = connection->priv;
769 char fileio_command[256];
770 int command_len;
771 bool program_exited = false;
772
773 if (strcmp(target->fileio_info->identifier, "open") == 0)
774 sprintf(fileio_command, "F%s,%" PRIx32 "/%" PRIx32 ",%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
775 target->fileio_info->param_1,
776 target->fileio_info->param_2,
777 target->fileio_info->param_3,
778 target->fileio_info->param_4);
779 else if (strcmp(target->fileio_info->identifier, "close") == 0)
780 sprintf(fileio_command, "F%s,%" PRIx32, target->fileio_info->identifier,
781 target->fileio_info->param_1);
782 else if (strcmp(target->fileio_info->identifier, "read") == 0)
783 sprintf(fileio_command, "F%s,%" PRIx32 ",%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
784 target->fileio_info->param_1,
785 target->fileio_info->param_2,
786 target->fileio_info->param_3);
787 else if (strcmp(target->fileio_info->identifier, "write") == 0)
788 sprintf(fileio_command, "F%s,%" PRIx32 ",%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
789 target->fileio_info->param_1,
790 target->fileio_info->param_2,
791 target->fileio_info->param_3);
792 else if (strcmp(target->fileio_info->identifier, "lseek") == 0)
793 sprintf(fileio_command, "F%s,%" PRIx32 ",%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
794 target->fileio_info->param_1,
795 target->fileio_info->param_2,
796 target->fileio_info->param_3);
797 else if (strcmp(target->fileio_info->identifier, "rename") == 0)
798 sprintf(fileio_command, "F%s,%" PRIx32 "/%" PRIx32 ",%" PRIx32 "/%" PRIx32, target->fileio_info->identifier,
799 target->fileio_info->param_1,
800 target->fileio_info->param_2,
801 target->fileio_info->param_3,
802 target->fileio_info->param_4);
803 else if (strcmp(target->fileio_info->identifier, "unlink") == 0)
804 sprintf(fileio_command, "F%s,%" PRIx32 "/%" PRIx32, target->fileio_info->identifier,
805 target->fileio_info->param_1,
806 target->fileio_info->param_2);
807 else if (strcmp(target->fileio_info->identifier, "stat") == 0)
808 sprintf(fileio_command, "F%s,%" PRIx32 "/%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
809 target->fileio_info->param_1,
810 target->fileio_info->param_2,
811 target->fileio_info->param_3);
812 else if (strcmp(target->fileio_info->identifier, "fstat") == 0)
813 sprintf(fileio_command, "F%s,%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
814 target->fileio_info->param_1,
815 target->fileio_info->param_2);
816 else if (strcmp(target->fileio_info->identifier, "gettimeofday") == 0)
817 sprintf(fileio_command, "F%s,%" PRIx32 ",%" PRIx32, target->fileio_info->identifier,
818 target->fileio_info->param_1,
819 target->fileio_info->param_2);
820 else if (strcmp(target->fileio_info->identifier, "isatty") == 0)
821 sprintf(fileio_command, "F%s,%" PRIx32, target->fileio_info->identifier,
822 target->fileio_info->param_1);
823 else if (strcmp(target->fileio_info->identifier, "system") == 0)
824 sprintf(fileio_command, "F%s,%" PRIx32 "/%" PRIx32, target->fileio_info->identifier,
825 target->fileio_info->param_1,
826 target->fileio_info->param_2);
827 else if (strcmp(target->fileio_info->identifier, "exit") == 0) {
828 /* If target hits exit syscall, report to GDB the program is terminated.
829 * In addition, let target run its own exit syscall handler. */
830 program_exited = true;
831 sprintf(fileio_command, "W%02" PRIx32, target->fileio_info->param_1);
832 } else {
833 LOG_DEBUG("Unknown syscall: %s", target->fileio_info->identifier);
834
835 /* encounter unknown syscall, continue */
836 gdb_connection->frontend_state = TARGET_RUNNING;
837 target_resume(target, 1, 0x0, 0, 0);
838 return;
839 }
840
841 command_len = strlen(fileio_command);
842 gdb_put_packet(connection, fileio_command, command_len);
843
844 if (program_exited) {
845 /* Use target_resume() to let target run its own exit syscall handler. */
846 gdb_connection->frontend_state = TARGET_RUNNING;
847 target_resume(target, 1, 0x0, 0, 0);
848 } else {
849 gdb_connection->frontend_state = TARGET_HALTED;
850 rtos_update_threads(target);
851 }
852 }
853
854 static void gdb_frontend_halted(struct target *target, struct connection *connection)
855 {
856 struct gdb_connection *gdb_connection = connection->priv;
857
858 /* In the GDB protocol when we are stepping or continuing execution,
859 * we have a lingering reply. Upon receiving a halted event
860 * when we have that lingering packet, we reply to the original
861 * step or continue packet.
862 *
863 * Executing monitor commands can bring the target in and
864 * out of the running state so we'll see lots of TARGET_EVENT_XXX
865 * that are to be ignored.
866 */
867 if (gdb_connection->frontend_state == TARGET_RUNNING) {
868 /* stop forwarding log packets! */
869 log_remove_callback(gdb_log_callback, connection);
870
871 /* check fileio first */
872 if (target_get_gdb_fileio_info(target, target->fileio_info) == ERROR_OK)
873 gdb_fileio_reply(target, connection);
874 else
875 gdb_signal_reply(target, connection);
876 }
877 }
878
879 static int gdb_target_callback_event_handler(struct target *target,
880 enum target_event event, void *priv)
881 {
882 int retval;
883 struct connection *connection = priv;
884 struct gdb_service *gdb_service = connection->service->priv;
885
886 if (gdb_service->target != target)
887 return ERROR_OK;
888
889 switch (event) {
890 case TARGET_EVENT_GDB_HALT:
891 gdb_frontend_halted(target, connection);
892 break;
893 case TARGET_EVENT_HALTED:
894 target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
895 break;
896 case TARGET_EVENT_GDB_FLASH_ERASE_START:
897 retval = jtag_execute_queue();
898 if (retval != ERROR_OK)
899 return retval;
900 break;
901 default:
902 break;
903 }
904
905 return ERROR_OK;
906 }
907
908 static int gdb_new_connection(struct connection *connection)
909 {
910 struct gdb_connection *gdb_connection = malloc(sizeof(struct gdb_connection));
911 struct gdb_service *gdb_service = connection->service->priv;
912 int retval;
913 int initial_ack;
914
915 connection->priv = gdb_connection;
916
917 /* initialize gdb connection information */
918 gdb_connection->buf_p = gdb_connection->buffer;
919 gdb_connection->buf_cnt = 0;
920 gdb_connection->ctrl_c = 0;
921 gdb_connection->frontend_state = TARGET_HALTED;
922 gdb_connection->vflash_image = NULL;
923 gdb_connection->closed = 0;
924 gdb_connection->busy = 0;
925 gdb_connection->noack_mode = 0;
926 gdb_connection->sync = false;
927 gdb_connection->mem_write_error = false;
928 gdb_connection->attached = true;
929 gdb_connection->target_desc.tdesc = NULL;
930 gdb_connection->target_desc.tdesc_length = 0;
931
932 /* send ACK to GDB for debug request */
933 gdb_write(connection, "+", 1);
934
935 /* output goes through gdb connection */
936 command_set_output_handler(connection->cmd_ctx, gdb_output, connection);
937
938 /* we must remove all breakpoints registered to the target as a previous
939 * GDB session could leave dangling breakpoints if e.g. communication
940 * timed out.
941 */
942 breakpoint_clear_target(gdb_service->target);
943 watchpoint_clear_target(gdb_service->target);
944
945 /* clean previous rtos session if supported*/
946 if ((gdb_service->target->rtos) && (gdb_service->target->rtos->type->clean))
947 gdb_service->target->rtos->type->clean(gdb_service->target);
948
949 /* remove the initial ACK from the incoming buffer */
950 retval = gdb_get_char(connection, &initial_ack);
951 if (retval != ERROR_OK)
952 return retval;
953
954 /* FIX!!!??? would we actually ever receive a + here???
955 * Not observed.
956 */
957 if (initial_ack != '+')
958 gdb_putback_char(connection, initial_ack);
959 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);
960
961 if (gdb_use_memory_map) {
962 /* Connect must fail if the memory map can't be set up correctly.
963 *
964 * This will cause an auto_probe to be invoked, which is either
965 * a no-op or it will fail when the target isn't ready(e.g. not halted).
966 */
967 int i;
968 for (i = 0; i < flash_get_bank_count(); i++) {
969 struct flash_bank *p;
970 p = get_flash_bank_by_num_noprobe(i);
971 if (p->target != gdb_service->target)
972 continue;
973 retval = get_flash_bank_by_num(i, &p);
974 if (retval != ERROR_OK) {
975 LOG_ERROR("Connect failed. Consider setting up a gdb-attach event for the target " \
976 "to prepare target for GDB connect, or use 'gdb_memory_map disable'.");
977 return retval;
978 }
979 }
980 }
981
982 gdb_actual_connections++;
983 LOG_DEBUG("New GDB Connection: %d, Target %s, state: %s",
984 gdb_actual_connections,
985 target_name(gdb_service->target),
986 target_state_name(gdb_service->target));
987
988 /* DANGER! If we fail subsequently, we must remove this handler,
989 * otherwise we occasionally see crashes as the timer can invoke the
990 * callback fn.
991 *
992 * register callback to be informed about target events */
993 target_register_event_callback(gdb_target_callback_event_handler, connection);
994
995 return ERROR_OK;
996 }
997
998 static int gdb_connection_closed(struct connection *connection)
999 {
1000 struct gdb_service *gdb_service = connection->service->priv;
1001 struct gdb_connection *gdb_connection = connection->priv;
1002
1003 /* we're done forwarding messages. Tear down callback before
1004 * cleaning up connection.
1005 */
1006 log_remove_callback(gdb_log_callback, connection);
1007
1008 gdb_actual_connections--;
1009 LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d",
1010 target_name(gdb_service->target),
1011 target_state_name(gdb_service->target),
1012 gdb_actual_connections);
1013
1014 /* see if an image built with vFlash commands is left */
1015 if (gdb_connection->vflash_image) {
1016 image_close(gdb_connection->vflash_image);
1017 free(gdb_connection->vflash_image);
1018 gdb_connection->vflash_image = NULL;
1019 }
1020
1021 /* if this connection registered a debug-message receiver delete it */
1022 delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
1023
1024 if (connection->priv) {
1025 free(connection->priv);
1026 connection->priv = NULL;
1027 } else
1028 LOG_ERROR("BUG: connection->priv == NULL");
1029
1030 target_unregister_event_callback(gdb_target_callback_event_handler, connection);
1031
1032 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);
1033
1034 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
1035
1036 return ERROR_OK;
1037 }
1038
1039 static void gdb_send_error(struct connection *connection, uint8_t the_error)
1040 {
1041 char err[4];
1042 snprintf(err, 4, "E%2.2X", the_error);
1043 gdb_put_packet(connection, err, 3);
1044 }
1045
1046 static int gdb_last_signal_packet(struct connection *connection,
1047 char *packet, int packet_size)
1048 {
1049 struct target *target = get_target_from_connection(connection);
1050 struct gdb_connection *gdb_con = connection->priv;
1051 char sig_reply[4];
1052 int signal_var;
1053
1054 if (!gdb_con->attached) {
1055 /* if we are here we have received a kill packet
1056 * reply W stop reply otherwise gdb gets very unhappy */
1057 gdb_put_packet(connection, "W00", 3);
1058 return ERROR_OK;
1059 }
1060
1061 signal_var = gdb_last_signal(target);
1062
1063 snprintf(sig_reply, 4, "S%2.2x", signal_var);
1064 gdb_put_packet(connection, sig_reply, 3);
1065
1066 return ERROR_OK;
1067 }
1068
1069 static inline int gdb_reg_pos(struct target *target, int pos, int len)
1070 {
1071 if (target->endianness == TARGET_LITTLE_ENDIAN)
1072 return pos;
1073 else
1074 return len - 1 - pos;
1075 }
1076
1077 /* Convert register to string of bytes. NB! The # of bits in the
1078 * register might be non-divisible by 8(a byte), in which
1079 * case an entire byte is shown.
1080 *
1081 * NB! the format on the wire is the target endianness
1082 *
1083 * The format of reg->value is little endian
1084 *
1085 */
1086 static void gdb_str_to_target(struct target *target,
1087 char *tstr, struct reg *reg)
1088 {
1089 int i;
1090
1091 uint8_t *buf;
1092 int buf_len;
1093 buf = reg->value;
1094 buf_len = DIV_ROUND_UP(reg->size, 8);
1095
1096 for (i = 0; i < buf_len; i++) {
1097 int j = gdb_reg_pos(target, i, buf_len);
1098 tstr += sprintf(tstr, "%02x", buf[j]);
1099 }
1100 }
1101
1102 /* copy over in register buffer */
1103 static void gdb_target_to_reg(struct target *target,
1104 char *tstr, int str_len, uint8_t *bin)
1105 {
1106 if (str_len % 2) {
1107 LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
1108 exit(-1);
1109 }
1110
1111 int i;
1112 for (i = 0; i < str_len; i += 2) {
1113 unsigned t;
1114 if (sscanf(tstr + i, "%02x", &t) != 1) {
1115 LOG_ERROR("BUG: unable to convert register value");
1116 exit(-1);
1117 }
1118
1119 int j = gdb_reg_pos(target, i/2, str_len/2);
1120 bin[j] = t;
1121 }
1122 }
1123
1124 static int gdb_get_registers_packet(struct connection *connection,
1125 char *packet, int packet_size)
1126 {
1127 struct target *target = get_target_from_connection(connection);
1128 struct reg **reg_list;
1129 int reg_list_size;
1130 int retval;
1131 int reg_packet_size = 0;
1132 char *reg_packet;
1133 char *reg_packet_p;
1134 int i;
1135
1136 #ifdef _DEBUG_GDB_IO_
1137 LOG_DEBUG("-");
1138 #endif
1139
1140 if ((target->rtos != NULL) && (ERROR_OK == rtos_get_gdb_reg_list(connection)))
1141 return ERROR_OK;
1142
1143 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1144 REG_CLASS_GENERAL);
1145 if (retval != ERROR_OK)
1146 return gdb_error(connection, retval);
1147
1148 for (i = 0; i < reg_list_size; i++)
1149 reg_packet_size += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
1150
1151 assert(reg_packet_size > 0);
1152
1153 reg_packet = malloc(reg_packet_size + 1); /* plus one for string termination null */
1154 reg_packet_p = reg_packet;
1155
1156 for (i = 0; i < reg_list_size; i++) {
1157 if (!reg_list[i]->valid)
1158 reg_list[i]->type->get(reg_list[i]);
1159 gdb_str_to_target(target, reg_packet_p, reg_list[i]);
1160 reg_packet_p += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
1161 }
1162
1163 #ifdef _DEBUG_GDB_IO_
1164 {
1165 char *reg_packet_p_debug;
1166 reg_packet_p_debug = strndup(reg_packet, reg_packet_size);
1167 LOG_DEBUG("reg_packet: %s", reg_packet_p_debug);
1168 free(reg_packet_p_debug);
1169 }
1170 #endif
1171
1172 gdb_put_packet(connection, reg_packet, reg_packet_size);
1173 free(reg_packet);
1174
1175 free(reg_list);
1176
1177 return ERROR_OK;
1178 }
1179
1180 static int gdb_set_registers_packet(struct connection *connection,
1181 char *packet, int packet_size)
1182 {
1183 struct target *target = get_target_from_connection(connection);
1184 int i;
1185 struct reg **reg_list;
1186 int reg_list_size;
1187 int retval;
1188 char *packet_p;
1189
1190 #ifdef _DEBUG_GDB_IO_
1191 LOG_DEBUG("-");
1192 #endif
1193
1194 /* skip command character */
1195 packet++;
1196 packet_size--;
1197
1198 if (packet_size % 2) {
1199 LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection");
1200 return ERROR_SERVER_REMOTE_CLOSED;
1201 }
1202
1203 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1204 REG_CLASS_GENERAL);
1205 if (retval != ERROR_OK)
1206 return gdb_error(connection, retval);
1207
1208 packet_p = packet;
1209 for (i = 0; i < reg_list_size; i++) {
1210 uint8_t *bin_buf;
1211 int chars = (DIV_ROUND_UP(reg_list[i]->size, 8) * 2);
1212
1213 if (packet_p + chars > packet + packet_size)
1214 LOG_ERROR("BUG: register packet is too small for registers");
1215
1216 bin_buf = malloc(DIV_ROUND_UP(reg_list[i]->size, 8));
1217 gdb_target_to_reg(target, packet_p, chars, bin_buf);
1218
1219 reg_list[i]->type->set(reg_list[i], bin_buf);
1220
1221 /* advance packet pointer */
1222 packet_p += chars;
1223
1224 free(bin_buf);
1225 }
1226
1227 /* free struct reg *reg_list[] array allocated by get_gdb_reg_list */
1228 free(reg_list);
1229
1230 gdb_put_packet(connection, "OK", 2);
1231
1232 return ERROR_OK;
1233 }
1234
1235 static int gdb_get_register_packet(struct connection *connection,
1236 char *packet, int packet_size)
1237 {
1238 struct target *target = get_target_from_connection(connection);
1239 char *reg_packet;
1240 int reg_num = strtoul(packet + 1, NULL, 16);
1241 struct reg **reg_list;
1242 int reg_list_size;
1243 int retval;
1244
1245 #ifdef _DEBUG_GDB_IO_
1246 LOG_DEBUG("-");
1247 #endif
1248
1249 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1250 REG_CLASS_ALL);
1251 if (retval != ERROR_OK)
1252 return gdb_error(connection, retval);
1253
1254 if (reg_list_size <= reg_num) {
1255 LOG_ERROR("gdb requested a non-existing register");
1256 return ERROR_SERVER_REMOTE_CLOSED;
1257 }
1258
1259 if (!reg_list[reg_num]->valid)
1260 reg_list[reg_num]->type->get(reg_list[reg_num]);
1261
1262 reg_packet = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2 + 1); /* plus one for string termination null */
1263
1264 gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
1265
1266 gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1267
1268 free(reg_list);
1269 free(reg_packet);
1270
1271 return ERROR_OK;
1272 }
1273
1274 static int gdb_set_register_packet(struct connection *connection,
1275 char *packet, int packet_size)
1276 {
1277 struct target *target = get_target_from_connection(connection);
1278 char *separator;
1279 uint8_t *bin_buf;
1280 int reg_num = strtoul(packet + 1, &separator, 16);
1281 struct reg **reg_list;
1282 int reg_list_size;
1283 int retval;
1284
1285 LOG_DEBUG("-");
1286
1287 retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size,
1288 REG_CLASS_ALL);
1289 if (retval != ERROR_OK)
1290 return gdb_error(connection, retval);
1291
1292 if (reg_list_size <= reg_num) {
1293 LOG_ERROR("gdb requested a non-existing register");
1294 return ERROR_SERVER_REMOTE_CLOSED;
1295 }
1296
1297 if (*separator != '=') {
1298 LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
1299 return ERROR_SERVER_REMOTE_CLOSED;
1300 }
1301
1302 /* convert from GDB-string (target-endian) to hex-string (big-endian) */
1303 bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
1304 int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
1305
1306 if ((unsigned int)chars != strlen(separator + 1)) {
1307 LOG_ERROR("gdb sent a packet with wrong register size");
1308 free(bin_buf);
1309 return ERROR_SERVER_REMOTE_CLOSED;
1310 }
1311
1312 gdb_target_to_reg(target, separator + 1, chars, bin_buf);
1313
1314 reg_list[reg_num]->type->set(reg_list[reg_num], bin_buf);
1315
1316 gdb_put_packet(connection, "OK", 2);
1317
1318 free(bin_buf);
1319 free(reg_list);
1320
1321 return ERROR_OK;
1322 }
1323
1324 /* No attempt is made to translate the "retval" to
1325 * GDB speak. This has to be done at the calling
1326 * site as no mapping really exists.
1327 */
1328 static int gdb_error(struct connection *connection, int retval)
1329 {
1330 LOG_DEBUG("Reporting %i to GDB as generic error", retval);
1331 gdb_send_error(connection, EFAULT);
1332 return ERROR_OK;
1333 }
1334
1335 /* We don't have to worry about the default 2 second timeout for GDB packets,
1336 * because GDB breaks up large memory reads into smaller reads.
1337 *
1338 * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
1339 */
1340 static int gdb_read_memory_packet(struct connection *connection,
1341 char *packet, int packet_size)
1342 {
1343 struct target *target = get_target_from_connection(connection);
1344 char *separator;
1345 uint32_t addr = 0;
1346 uint32_t len = 0;
1347
1348 uint8_t *buffer;
1349 char *hex_buffer;
1350
1351 int retval = ERROR_OK;
1352
1353 /* skip command character */
1354 packet++;
1355
1356 addr = strtoul(packet, &separator, 16);
1357
1358 if (*separator != ',') {
1359 LOG_ERROR("incomplete read memory packet received, dropping connection");
1360 return ERROR_SERVER_REMOTE_CLOSED;
1361 }
1362
1363 len = strtoul(separator + 1, NULL, 16);
1364
1365 if (!len) {
1366 LOG_WARNING("invalid read memory packet received (len == 0)");
1367 gdb_put_packet(connection, NULL, 0);
1368 return ERROR_OK;
1369 }
1370
1371 buffer = malloc(len);
1372
1373 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1374
1375 retval = target_read_buffer(target, addr, len, buffer);
1376
1377 if ((retval != ERROR_OK) && !gdb_report_data_abort) {
1378 /* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
1379 * At some point this might be fixed in GDB, in which case this code can be removed.
1380 *
1381 * OpenOCD developers are acutely aware of this problem, but there is nothing
1382 * gained by involving the user in this problem that hopefully will get resolved
1383 * eventually
1384 *
1385 * http://sourceware.org/cgi-bin/gnatsweb.pl? \
1386 * cmd = view%20audit-trail&database = gdb&pr = 2395
1387 *
1388 * For now, the default is to fix up things to make current GDB versions work.
1389 * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
1390 */
1391 memset(buffer, 0, len);
1392 retval = ERROR_OK;
1393 }
1394
1395 if (retval == ERROR_OK) {
1396 hex_buffer = malloc(len * 2 + 1);
1397
1398 int pkt_len = hexify(hex_buffer, (char *)buffer, len, len * 2 + 1);
1399
1400 gdb_put_packet(connection, hex_buffer, pkt_len);
1401
1402 free(hex_buffer);
1403 } else
1404 retval = gdb_error(connection, retval);
1405
1406 free(buffer);
1407
1408 return retval;
1409 }
1410
1411 static int gdb_write_memory_packet(struct connection *connection,
1412 char *packet, int packet_size)
1413 {
1414 struct target *target = get_target_from_connection(connection);
1415 char *separator;
1416 uint32_t addr = 0;
1417 uint32_t len = 0;
1418
1419 uint8_t *buffer;
1420 int retval;
1421
1422 /* skip command character */
1423 packet++;
1424
1425 addr = strtoul(packet, &separator, 16);
1426
1427 if (*separator != ',') {
1428 LOG_ERROR("incomplete write memory packet received, dropping connection");
1429 return ERROR_SERVER_REMOTE_CLOSED;
1430 }
1431
1432 len = strtoul(separator + 1, &separator, 16);
1433
1434 if (*(separator++) != ':') {
1435 LOG_ERROR("incomplete write memory packet received, dropping connection");
1436 return ERROR_SERVER_REMOTE_CLOSED;
1437 }
1438
1439 buffer = malloc(len);
1440
1441 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1442
1443 if (unhexify((char *)buffer, separator, len) != (int)len)
1444 LOG_ERROR("unable to decode memory packet");
1445
1446 retval = target_write_buffer(target, addr, len, buffer);
1447
1448 if (retval == ERROR_OK)
1449 gdb_put_packet(connection, "OK", 2);
1450 else
1451 retval = gdb_error(connection, retval);
1452
1453 free(buffer);
1454
1455 return retval;
1456 }
1457
1458 static int gdb_write_memory_binary_packet(struct connection *connection,
1459 char *packet, int packet_size)
1460 {
1461 struct target *target = get_target_from_connection(connection);
1462 char *separator;
1463 uint32_t addr = 0;
1464 uint32_t len = 0;
1465
1466 int retval = ERROR_OK;
1467
1468 /* skip command character */
1469 packet++;
1470
1471 addr = strtoul(packet, &separator, 16);
1472
1473 if (*separator != ',') {
1474 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1475 return ERROR_SERVER_REMOTE_CLOSED;
1476 }
1477
1478 len = strtoul(separator + 1, &separator, 16);
1479
1480 if (*(separator++) != ':') {
1481 LOG_ERROR("incomplete write memory binary packet received, dropping connection");
1482 return ERROR_SERVER_REMOTE_CLOSED;
1483 }
1484
1485 struct gdb_connection *gdb_connection = connection->priv;
1486
1487 if (gdb_connection->mem_write_error) {
1488 retval = ERROR_FAIL;
1489 /* now that we have reported the memory write error, we can clear the condition */
1490 gdb_connection->mem_write_error = false;
1491 }
1492
1493 /* By replying the packet *immediately* GDB will send us a new packet
1494 * while we write the last one to the target.
1495 */
1496 if (retval == ERROR_OK)
1497 gdb_put_packet(connection, "OK", 2);
1498 else {
1499 retval = gdb_error(connection, retval);
1500 if (retval != ERROR_OK)
1501 return retval;
1502 }
1503
1504 if (len) {
1505 LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
1506
1507 retval = target_write_buffer(target, addr, len, (uint8_t *)separator);
1508 if (retval != ERROR_OK)
1509 gdb_connection->mem_write_error = true;
1510 }
1511
1512 return ERROR_OK;
1513 }
1514
1515 static int gdb_step_continue_packet(struct connection *connection,
1516 char *packet, int packet_size)
1517 {
1518 struct target *target = get_target_from_connection(connection);
1519 int current = 0;
1520 uint32_t address = 0x0;
1521 int retval = ERROR_OK;
1522
1523 LOG_DEBUG("-");
1524
1525 if (packet_size > 1) {
1526 packet[packet_size] = 0;
1527 address = strtoul(packet + 1, NULL, 16);
1528 } else
1529 current = 1;
1530
1531 gdb_running_type = packet[0];
1532 if (packet[0] == 'c') {
1533 LOG_DEBUG("continue");
1534 /* resume at current address, don't handle breakpoints, not debugging */
1535 retval = target_resume(target, current, address, 0, 0);
1536 } else if (packet[0] == 's') {
1537 LOG_DEBUG("step");
1538 /* step at current or address, don't handle breakpoints */
1539 retval = target_step(target, current, address, 0);
1540 }
1541 return retval;
1542 }
1543
1544 static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
1545 char *packet, int packet_size)
1546 {
1547 struct target *target = get_target_from_connection(connection);
1548 int type;
1549 enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
1550 enum watchpoint_rw wp_type = WPT_READ /* dummy init to avoid warning */;
1551 uint32_t address;
1552 uint32_t size;
1553 char *separator;
1554 int retval;
1555
1556 LOG_DEBUG("-");
1557
1558 type = strtoul(packet + 1, &separator, 16);
1559
1560 if (type == 0) /* memory breakpoint */
1561 bp_type = BKPT_SOFT;
1562 else if (type == 1) /* hardware breakpoint */
1563 bp_type = BKPT_HARD;
1564 else if (type == 2) /* write watchpoint */
1565 wp_type = WPT_WRITE;
1566 else if (type == 3) /* read watchpoint */
1567 wp_type = WPT_READ;
1568 else if (type == 4) /* access watchpoint */
1569 wp_type = WPT_ACCESS;
1570 else {
1571 LOG_ERROR("invalid gdb watch/breakpoint type(%d), dropping connection", type);
1572 return ERROR_SERVER_REMOTE_CLOSED;
1573 }
1574
1575 if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT) || (bp_type == BKPT_HARD)))
1576 bp_type = gdb_breakpoint_override_type;
1577
1578 if (*separator != ',') {
1579 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1580 return ERROR_SERVER_REMOTE_CLOSED;
1581 }
1582
1583 address = strtoul(separator + 1, &separator, 16);
1584
1585 if (*separator != ',') {
1586 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1587 return ERROR_SERVER_REMOTE_CLOSED;
1588 }
1589
1590 size = strtoul(separator + 1, &separator, 16);
1591
1592 switch (type) {
1593 case 0:
1594 case 1:
1595 if (packet[0] == 'Z') {
1596 retval = breakpoint_add(target, address, size, bp_type);
1597 if (retval != ERROR_OK) {
1598 retval = gdb_error(connection, retval);
1599 if (retval != ERROR_OK)
1600 return retval;
1601 } else
1602 gdb_put_packet(connection, "OK", 2);
1603 } else {
1604 breakpoint_remove(target, address);
1605 gdb_put_packet(connection, "OK", 2);
1606 }
1607 break;
1608 case 2:
1609 case 3:
1610 case 4:
1611 {
1612 if (packet[0] == 'Z') {
1613 retval = watchpoint_add(target, address, size, wp_type, 0, 0xffffffffu);
1614 if (retval != ERROR_OK) {
1615 retval = gdb_error(connection, retval);
1616 if (retval != ERROR_OK)
1617 return retval;
1618 } else
1619 gdb_put_packet(connection, "OK", 2);
1620 } else {
1621 watchpoint_remove(target, address);
1622 gdb_put_packet(connection, "OK", 2);
1623 }
1624 break;
1625 }
1626 default:
1627 break;
1628 }
1629
1630 return ERROR_OK;
1631 }
1632
1633 /* print out a string and allocate more space as needed,
1634 * mainly used for XML at this point
1635 */
1636 static void xml_printf(int *retval, char **xml, int *pos, int *size,
1637 const char *fmt, ...)
1638 {
1639 if (*retval != ERROR_OK)
1640 return;
1641 int first = 1;
1642
1643 for (;; ) {
1644 if ((*xml == NULL) || (!first)) {
1645 /* start by 0 to exercise all the code paths.
1646 * Need minimum 2 bytes to fit 1 char and 0 terminator. */
1647
1648 *size = *size * 2 + 2;
1649 char *t = *xml;
1650 *xml = realloc(*xml, *size);
1651 if (*xml == NULL) {
1652 if (t)
1653 free(t);
1654 *retval = ERROR_SERVER_REMOTE_CLOSED;
1655 return;
1656 }
1657 }
1658
1659 va_list ap;
1660 int ret;
1661 va_start(ap, fmt);
1662 ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
1663 va_end(ap);
1664 if ((ret > 0) && ((ret + 1) < *size - *pos)) {
1665 *pos += ret;
1666 return;
1667 }
1668 /* there was just enough or not enough space, allocate more. */
1669 first = 0;
1670 }
1671 }
1672
1673 static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len)
1674 {
1675 char *separator;
1676
1677 /* Extract and NUL-terminate the annex. */
1678 *annex = buf;
1679 while (*buf && *buf != ':')
1680 buf++;
1681 if (*buf == '\0')
1682 return -1;
1683 *buf++ = 0;
1684
1685 /* After the read marker and annex, qXfer looks like a
1686 * traditional 'm' packet. */
1687
1688 *ofs = strtoul(buf, &separator, 16);
1689
1690 if (*separator != ',')
1691 return -1;
1692
1693 *len = strtoul(separator + 1, NULL, 16);
1694
1695 return 0;
1696 }
1697
1698 static int compare_bank(const void *a, const void *b)
1699 {
1700 struct flash_bank *b1, *b2;
1701 b1 = *((struct flash_bank **)a);
1702 b2 = *((struct flash_bank **)b);
1703
1704 if (b1->base == b2->base)
1705 return 0;
1706 else if (b1->base > b2->base)
1707 return 1;
1708 else
1709 return -1;
1710 }
1711
1712 static int gdb_memory_map(struct connection *connection,
1713 char *packet, int packet_size)
1714 {
1715 /* We get away with only specifying flash here. Regions that are not
1716 * specified are treated as if we provided no memory map(if not we
1717 * could detect the holes and mark them as RAM).
1718 * Normally we only execute this code once, but no big deal if we
1719 * have to regenerate it a couple of times.
1720 */
1721
1722 struct target *target = get_target_from_connection(connection);
1723 struct flash_bank *p;
1724 char *xml = NULL;
1725 int size = 0;
1726 int pos = 0;
1727 int retval = ERROR_OK;
1728 struct flash_bank **banks;
1729 int offset;
1730 int length;
1731 char *separator;
1732 uint32_t ram_start = 0;
1733 int i;
1734 int target_flash_banks = 0;
1735
1736 /* skip command character */
1737 packet += 23;
1738
1739 offset = strtoul(packet, &separator, 16);
1740 length = strtoul(separator + 1, &separator, 16);
1741
1742 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1743
1744 /* Sort banks in ascending order. We need to report non-flash
1745 * memory as ram (or rather read/write) by default for GDB, since
1746 * it has no concept of non-cacheable read/write memory (i/o etc).
1747 *
1748 * FIXME Most non-flash addresses are *NOT* RAM! Don't lie.
1749 * Current versions of GDB assume unlisted addresses are RAM...
1750 */
1751 banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
1752
1753 for (i = 0; i < flash_get_bank_count(); i++) {
1754 p = get_flash_bank_by_num_noprobe(i);
1755 if (p->target != target)
1756 continue;
1757 retval = get_flash_bank_by_num(i, &p);
1758 if (retval != ERROR_OK) {
1759 free(banks);
1760 gdb_error(connection, retval);
1761 return retval;
1762 }
1763 banks[target_flash_banks++] = p;
1764 }
1765
1766 qsort(banks, target_flash_banks, sizeof(struct flash_bank *),
1767 compare_bank);
1768
1769 for (i = 0; i < target_flash_banks; i++) {
1770 int j;
1771 unsigned sector_size = 0;
1772 uint32_t start;
1773
1774 p = banks[i];
1775 start = p->base;
1776
1777 if (ram_start < p->base)
1778 xml_printf(&retval, &xml, &pos, &size,
1779 "<memory type=\"ram\" start=\"0x%x\" "
1780 "length=\"0x%x\"/>\n",
1781 ram_start, p->base - ram_start);
1782
1783 /* Report adjacent groups of same-size sectors. So for
1784 * example top boot CFI flash will list an initial region
1785 * with several large sectors (maybe 128KB) and several
1786 * smaller ones at the end (maybe 32KB). STR7 will have
1787 * regions with 8KB, 32KB, and 64KB sectors; etc.
1788 */
1789 for (j = 0; j < p->num_sectors; j++) {
1790 unsigned group_len;
1791
1792 /* Maybe start a new group of sectors. */
1793 if (sector_size == 0) {
1794 start = p->base + p->sectors[j].offset;
1795 xml_printf(&retval, &xml, &pos, &size,
1796 "<memory type=\"flash\" "
1797 "start=\"0x%x\" ",
1798 start);
1799 sector_size = p->sectors[j].size;
1800 }
1801
1802 /* Does this finish a group of sectors?
1803 * If not, continue an already-started group.
1804 */
1805 if (j == p->num_sectors - 1)
1806 group_len = (p->base + p->size) - start;
1807 else if (p->sectors[j + 1].size != sector_size)
1808 group_len = p->base + p->sectors[j + 1].offset
1809 - start;
1810 else
1811 continue;
1812
1813 xml_printf(&retval, &xml, &pos, &size,
1814 "length=\"0x%x\">\n"
1815 "<property name=\"blocksize\">"
1816 "0x%x</property>\n"
1817 "</memory>\n",
1818 group_len,
1819 sector_size);
1820 sector_size = 0;
1821 }
1822
1823 ram_start = p->base + p->size;
1824 }
1825
1826 if (ram_start != 0)
1827 xml_printf(&retval, &xml, &pos, &size,
1828 "<memory type=\"ram\" start=\"0x%x\" "
1829 "length=\"0x%x\"/>\n",
1830 ram_start, 0-ram_start);
1831 /* ELSE a flash chip could be at the very end of the 32 bit address
1832 * space, in which case ram_start will be precisely 0
1833 */
1834
1835 free(banks);
1836 banks = NULL;
1837
1838 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1839
1840 if (retval != ERROR_OK) {
1841 gdb_error(connection, retval);
1842 return retval;
1843 }
1844
1845 if (offset + length > pos)
1846 length = pos - offset;
1847
1848 char *t = malloc(length + 1);
1849 t[0] = 'l';
1850 memcpy(t + 1, xml + offset, length);
1851 gdb_put_packet(connection, t, length + 1);
1852
1853 free(t);
1854 free(xml);
1855 return ERROR_OK;
1856 }
1857
1858 static const char *gdb_get_reg_type_name(enum reg_type type)
1859 {
1860 switch (type) {
1861 case REG_TYPE_INT:
1862 return "int";
1863 case REG_TYPE_INT8:
1864 return "int8";
1865 case REG_TYPE_INT16:
1866 return "int16";
1867 case REG_TYPE_INT32:
1868 return "int32";
1869 case REG_TYPE_INT64:
1870 return "int64";
1871 case REG_TYPE_INT128:
1872 return "int128";
1873 case REG_TYPE_UINT8:
1874 return "uint8";
1875 case REG_TYPE_UINT16:
1876 return "uint16";
1877 case REG_TYPE_UINT32:
1878 return "uint32";
1879 case REG_TYPE_UINT64:
1880 return "uint64";
1881 case REG_TYPE_UINT128:
1882 return "uint128";
1883 case REG_TYPE_CODE_PTR:
1884 return "code_ptr";
1885 case REG_TYPE_DATA_PTR:
1886 return "data_ptr";
1887 case REG_TYPE_FLOAT:
1888 return "float";
1889 case REG_TYPE_IEEE_SINGLE:
1890 return "ieee_single";
1891 case REG_TYPE_IEEE_DOUBLE:
1892 return "ieee_double";
1893 case REG_TYPE_ARCH_DEFINED:
1894 return "int"; /* return arbitrary string to avoid compile warning. */
1895 }
1896
1897 return "int"; /* "int" as default value */
1898 }
1899
1900 static int gdb_generate_reg_type_description(struct target *target,
1901 char **tdesc, int *pos, int *size, struct reg_data_type *type)
1902 {
1903 int retval = ERROR_OK;
1904
1905 if (type->type_class == REG_TYPE_CLASS_VECTOR) {
1906 /* <vector id="id" type="type" count="count"/> */
1907 xml_printf(&retval, tdesc, pos, size,
1908 "<vector id=\"%s\" type=\"%s\" count=\"%d\"/>\n",
1909 type->id, type->reg_type_vector->type->id,
1910 type->reg_type_vector->count);
1911
1912 } else if (type->type_class == REG_TYPE_CLASS_UNION) {
1913 /* <union id="id">
1914 * <field name="name" type="type"/> ...
1915 * </union> */
1916 xml_printf(&retval, tdesc, pos, size,
1917 "<union id=\"%s\">\n",
1918 type->id);
1919
1920 struct reg_data_type_union_field *field;
1921 field = type->reg_type_union->fields;
1922 while (field != NULL) {
1923 xml_printf(&retval, tdesc, pos, size,
1924 "<field name=\"%s\" type=\"%s\"/>\n",
1925 field->name, field->type->id);
1926
1927 field = field->next;
1928 }
1929
1930 xml_printf(&retval, tdesc, pos, size,
1931 "</union>\n");
1932
1933 } else if (type->type_class == REG_TYPE_CLASS_STRUCT) {
1934 struct reg_data_type_struct_field *field;
1935 field = type->reg_type_struct->fields;
1936
1937 if (field->use_bitfields) {
1938 /* <struct id="id" size="size">
1939 * <field name="name" start="start" end="end"/> ...
1940 * </struct> */
1941 xml_printf(&retval, tdesc, pos, size,
1942 "<struct id=\"%s\" size=\"%d\">\n",
1943 type->id, type->reg_type_struct->size);
1944 while (field != NULL) {
1945 xml_printf(&retval, tdesc, pos, size,
1946 "<field name=\"%s\" start=\"%d\" end=\"%d\"/>\n",
1947 field->name, field->bitfield->start,
1948 field->bitfield->end);
1949
1950 field = field->next;
1951 }
1952 } else {
1953 /* <struct id="id">
1954 * <field name="name" type="type"/> ...
1955 * </struct> */
1956 xml_printf(&retval, tdesc, pos, size,
1957 "<struct id=\"%s\">\n",
1958 type->id);
1959 while (field != NULL) {
1960 xml_printf(&retval, tdesc, pos, size,
1961 "<field name=\"%s\" type=\"%s\"/>\n",
1962 field->name, field->type->id);
1963
1964 field = field->next;
1965 }
1966 }
1967
1968 xml_printf(&retval, tdesc, pos, size,
1969 "</struct>\n");
1970
1971 } else if (type->type_class == REG_TYPE_CLASS_FLAGS) {
1972 /* <flags id="id" size="size">
1973 * <field name="name" start="start" end="end"/> ...
1974 * </flags> */
1975 xml_printf(&retval, tdesc, pos, size,
1976 "<flags id=\"%s\" size=\"%d\">\n",
1977 type->id, type->reg_type_flags->size);
1978
1979 struct reg_data_type_flags_field *field;
1980 field = type->reg_type_flags->fields;
1981 while (field != NULL) {
1982 xml_printf(&retval, tdesc, pos, size,
1983 "<field name=\"%s\" start=\"%d\" end=\"%d\"/>\n",
1984 field->name, field->bitfield->start, field->bitfield->end);
1985
1986 field = field->next;
1987 }
1988
1989 xml_printf(&retval, tdesc, pos, size,
1990 "</flags>\n");
1991
1992 }
1993
1994 return ERROR_OK;
1995 }
1996
1997 /* Get a list of available target registers features. feature_list must
1998 * be freed by caller.
1999 */
2000 static int get_reg_features_list(struct target *target, char **feature_list[], int *feature_list_size,
2001 struct reg **reg_list, int reg_list_size)
2002 {
2003 int tbl_sz = 0;
2004
2005 /* Start with only one element */
2006 *feature_list = calloc(1, sizeof(char *));
2007
2008 for (int i = 0; i < reg_list_size; i++) {
2009 if (reg_list[i]->exist == false)
2010 continue;
2011
2012 if (reg_list[i]->feature != NULL
2013 && reg_list[i]->feature->name != NULL
2014 && (strcmp(reg_list[i]->feature->name, ""))) {
2015 /* We found a feature, check if the feature is already in the
2016 * table. If not, allocate a new entry for the table and
2017 * put the new feature in it.
2018 */
2019 for (int j = 0; j < (tbl_sz + 1); j++) {
2020 if (!((*feature_list)[j])) {
2021 (*feature_list)[tbl_sz++] = strdup(reg_list[i]->feature->name);
2022 *feature_list = realloc(*feature_list, sizeof(char *) * (tbl_sz + 1));
2023 (*feature_list)[tbl_sz] = NULL;
2024 break;
2025 } else {
2026 if (!strcmp((*feature_list)[j], reg_list[i]->feature->name))
2027 break;
2028 }
2029 }
2030 }
2031 }
2032
2033 if (feature_list_size)
2034 *feature_list_size = tbl_sz;
2035
2036 return ERROR_OK;
2037 }
2038
2039 static int gdb_generate_target_description(struct target *target, char **tdesc_out)
2040 {
2041 int retval = ERROR_OK;
2042 struct reg **reg_list;
2043 int reg_list_size;
2044 char *tdesc = NULL;
2045 int pos = 0;
2046 int size = 0;
2047
2048 retval = target_get_gdb_reg_list(target, &reg_list,
2049 &reg_list_size, REG_CLASS_ALL);
2050
2051 if (retval != ERROR_OK) {
2052 LOG_ERROR("get register list failed");
2053 return ERROR_FAIL;
2054 }
2055
2056 if (reg_list_size <= 0) {
2057 free(reg_list);
2058 return ERROR_FAIL;
2059 }
2060
2061 char **features = NULL;
2062 /* Get a list of available target registers features */
2063 retval = get_reg_features_list(target, &features, NULL, reg_list, reg_list_size);
2064 if (retval != ERROR_OK) {
2065 LOG_ERROR("Can't get the registers feature list");
2066 free(reg_list);
2067 return ERROR_FAIL;
2068 }
2069
2070 /* If we found some features associated with registers, create sections */
2071 int current_feature = 0;
2072
2073 xml_printf(&retval, &tdesc, &pos, &size,
2074 "<?xml version=\"1.0\"?>\n"
2075 "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
2076 "<target version=\"1.0\">\n");
2077
2078 /* generate target description according to register list */
2079 if (features != NULL) {
2080 while (features[current_feature]) {
2081
2082 xml_printf(&retval, &tdesc, &pos, &size,
2083 "<feature name=\"%s\">\n",
2084 features[current_feature]);
2085
2086 int i;
2087 for (i = 0; i < reg_list_size; i++) {
2088
2089 if (reg_list[i]->exist == false)
2090 continue;
2091
2092 if (strcmp(reg_list[i]->feature->name, features[current_feature]))
2093 continue;
2094
2095 const char *type_str;
2096 if (reg_list[i]->reg_data_type != NULL) {
2097 if (reg_list[i]->reg_data_type->type == REG_TYPE_ARCH_DEFINED) {
2098 /* generate <type... first, if there are architecture-defined types. */
2099 gdb_generate_reg_type_description(target, &tdesc, &pos, &size,
2100 reg_list[i]->reg_data_type);
2101
2102 type_str = reg_list[i]->reg_data_type->id;
2103 } else {
2104 /* predefined type */
2105 type_str = gdb_get_reg_type_name(
2106 reg_list[i]->reg_data_type->type);
2107 }
2108 } else {
2109 /* Default type is "int" */
2110 type_str = "int";
2111 }
2112
2113 xml_printf(&retval, &tdesc, &pos, &size,
2114 "<reg name=\"%s\"", reg_list[i]->name);
2115 xml_printf(&retval, &tdesc, &pos, &size,
2116 " bitsize=\"%d\"", reg_list[i]->size);
2117 xml_printf(&retval, &tdesc, &pos, &size,
2118 " regnum=\"%d\"", reg_list[i]->number);
2119 if (reg_list[i]->caller_save)
2120 xml_printf(&retval, &tdesc, &pos, &size,
2121 " save-restore=\"yes\"");
2122 else
2123 xml_printf(&retval, &tdesc, &pos, &size,
2124 " save-restore=\"no\"");
2125
2126 xml_printf(&retval, &tdesc, &pos, &size,
2127 " type=\"%s\"", type_str);
2128
2129 if (reg_list[i]->group != NULL)
2130 xml_printf(&retval, &tdesc, &pos, &size,
2131 " group=\"%s\"", reg_list[i]->group);
2132
2133 xml_printf(&retval, &tdesc, &pos, &size,
2134 "/>\n");
2135 }
2136
2137 xml_printf(&retval, &tdesc, &pos, &size,
2138 "</feature>\n");
2139
2140 current_feature++;
2141 }
2142 }
2143
2144 xml_printf(&retval, &tdesc, &pos, &size,
2145 "</target>\n");
2146
2147 free(reg_list);
2148 free(features);
2149
2150 if (retval == ERROR_OK)
2151 *tdesc_out = tdesc;
2152 else
2153 free(tdesc);
2154
2155 return retval;
2156 }
2157
2158 static int gdb_get_target_description_chunk(struct target *target, struct target_desc_format *target_desc,
2159 char **chunk, int32_t offset, uint32_t length)
2160 {
2161 if (target_desc == NULL) {
2162 LOG_ERROR("Unable to Generate Target Description");
2163 return ERROR_FAIL;
2164 }
2165
2166 char *tdesc = target_desc->tdesc;
2167 uint32_t tdesc_length = target_desc->tdesc_length;
2168
2169 if (tdesc == NULL) {
2170 int retval = gdb_generate_target_description(target, &tdesc);
2171 if (retval != ERROR_OK) {
2172 LOG_ERROR("Unable to Generate Target Description");
2173 return ERROR_FAIL;
2174 }
2175
2176 tdesc_length = strlen(tdesc);
2177 }
2178
2179 char transfer_type;
2180
2181 if (length < (tdesc_length - offset))
2182 transfer_type = 'm';
2183 else
2184 transfer_type = 'l';
2185
2186 *chunk = malloc(length + 2);
2187 if (*chunk == NULL) {
2188 LOG_ERROR("Unable to allocate memory");
2189 return ERROR_FAIL;
2190 }
2191
2192 (*chunk)[0] = transfer_type;
2193 if (transfer_type == 'm') {
2194 strncpy((*chunk) + 1, tdesc + offset, length);
2195 (*chunk)[1 + length] = '\0';
2196 } else {
2197 strncpy((*chunk) + 1, tdesc + offset, tdesc_length - offset);
2198 (*chunk)[1 + (tdesc_length - offset)] = '\0';
2199
2200 /* After gdb-server sends out last chunk, invalidate tdesc. */
2201 free(tdesc);
2202 tdesc = NULL;
2203 tdesc_length = 0;
2204 }
2205
2206 target_desc->tdesc = tdesc;
2207 target_desc->tdesc_length = tdesc_length;
2208
2209 return ERROR_OK;
2210 }
2211
2212 static int gdb_target_description_supported(struct target *target, int *supported)
2213 {
2214 int retval = ERROR_OK;
2215 struct reg **reg_list = NULL;
2216 int reg_list_size = 0;
2217 int feature_list_size = 0;
2218 char **features = NULL;
2219
2220 retval = target_get_gdb_reg_list(target, &reg_list,
2221 &reg_list_size, REG_CLASS_ALL);
2222 if (retval != ERROR_OK) {
2223 LOG_ERROR("get register list failed");
2224 goto error;
2225 }
2226
2227 if (reg_list_size <= 0) {
2228 retval = ERROR_FAIL;
2229 goto error;
2230 }
2231
2232 /* Get a list of available target registers features */
2233 retval = get_reg_features_list(target, &features, &feature_list_size, reg_list, reg_list_size);
2234 if (retval != ERROR_OK) {
2235 LOG_ERROR("Can't get the registers feature list");
2236 goto error;
2237 }
2238
2239 if (supported) {
2240 if (feature_list_size)
2241 *supported = 1;
2242 else
2243 *supported = 0;
2244 }
2245
2246 error:
2247 if (reg_list != NULL)
2248 free(reg_list);
2249
2250 if (features != NULL)
2251 free(features);
2252
2253 return retval;
2254 }
2255
2256 static int gdb_query_packet(struct connection *connection,
2257 char *packet, int packet_size)
2258 {
2259 struct command_context *cmd_ctx = connection->cmd_ctx;
2260 struct gdb_connection *gdb_connection = connection->priv;
2261 struct target *target = get_target_from_connection(connection);
2262
2263 if (strncmp(packet, "qRcmd,", 6) == 0) {
2264 if (packet_size > 6) {
2265 char *cmd;
2266 cmd = malloc((packet_size - 6) / 2 + 1);
2267 int len = unhexify(cmd, packet + 6, (packet_size - 6) / 2);
2268 cmd[len] = 0;
2269
2270 /* We want to print all debug output to GDB connection */
2271 log_add_callback(gdb_log_callback, connection);
2272 target_call_timer_callbacks_now();
2273 /* some commands need to know the GDB connection, make note of current
2274 * GDB connection. */
2275 current_gdb_connection = gdb_connection;
2276 command_run_line(cmd_ctx, cmd);
2277 current_gdb_connection = NULL;
2278 target_call_timer_callbacks_now();
2279 log_remove_callback(gdb_log_callback, connection);
2280 free(cmd);
2281 }
2282 gdb_put_packet(connection, "OK", 2);
2283 return ERROR_OK;
2284 } else if (strncmp(packet, "qCRC:", 5) == 0) {
2285 if (packet_size > 5) {
2286 int retval;
2287 char gdb_reply[10];
2288 char *separator;
2289 uint32_t checksum;
2290 uint32_t addr = 0;
2291 uint32_t len = 0;
2292
2293 /* skip command character */
2294 packet += 5;
2295
2296 addr = strtoul(packet, &separator, 16);
2297
2298 if (*separator != ',') {
2299 LOG_ERROR("incomplete read memory packet received, dropping connection");
2300 return ERROR_SERVER_REMOTE_CLOSED;
2301 }
2302
2303 len = strtoul(separator + 1, NULL, 16);
2304
2305 retval = target_checksum_memory(target, addr, len, &checksum);
2306
2307 if (retval == ERROR_OK) {
2308 snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
2309 gdb_put_packet(connection, gdb_reply, 9);
2310 } else {
2311 retval = gdb_error(connection, retval);
2312 if (retval != ERROR_OK)
2313 return retval;
2314 }
2315
2316 return ERROR_OK;
2317 }
2318 } else if (strncmp(packet, "qSupported", 10) == 0) {
2319 /* we currently support packet size and qXfer:memory-map:read (if enabled)
2320 * qXfer:features:read is supported for some targets */
2321 int retval = ERROR_OK;
2322 char *buffer = NULL;
2323 int pos = 0;
2324 int size = 0;
2325 int gdb_target_desc_supported = 0;
2326
2327 /* we need to test that the target supports target descriptions */
2328 retval = gdb_target_description_supported(target, &gdb_target_desc_supported);
2329 if (retval != ERROR_OK) {
2330 LOG_INFO("Failed detecting Target Description Support, disabling");
2331 gdb_target_desc_supported = 0;
2332 }
2333
2334 /* support may be disabled globally */
2335 if (gdb_use_target_description == 0) {
2336 if (gdb_target_desc_supported)
2337 LOG_WARNING("Target Descriptions Supported, but disabled");
2338 gdb_target_desc_supported = 0;
2339 }
2340
2341 xml_printf(&retval,
2342 &buffer,
2343 &pos,
2344 &size,
2345 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read%c;QStartNoAckMode+",
2346 (GDB_BUFFER_SIZE - 1),
2347 ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-',
2348 (gdb_target_desc_supported == 1) ? '+' : '-');
2349
2350 if (retval != ERROR_OK) {
2351 gdb_send_error(connection, 01);
2352 return ERROR_OK;
2353 }
2354
2355 gdb_put_packet(connection, buffer, strlen(buffer));
2356 free(buffer);
2357
2358 return ERROR_OK;
2359 } else if ((strncmp(packet, "qXfer:memory-map:read::", 23) == 0)
2360 && (flash_get_bank_count() > 0))
2361 return gdb_memory_map(connection, packet, packet_size);
2362 else if (strncmp(packet, "qXfer:features:read:", 20) == 0) {
2363 char *xml = NULL;
2364 int retval = ERROR_OK;
2365
2366 int offset;
2367 unsigned int length;
2368 char *annex;
2369
2370 /* skip command character */
2371 packet += 20;
2372
2373 if (decode_xfer_read(packet, &annex, &offset, &length) < 0) {
2374 gdb_send_error(connection, 01);
2375 return ERROR_OK;
2376 }
2377
2378 /* Target should prepare correct target description for annex.
2379 * The first character of returned xml is 'm' or 'l'. 'm' for
2380 * there are *more* chunks to transfer. 'l' for it is the *last*
2381 * chunk of target description.
2382 */
2383 retval = gdb_get_target_description_chunk(target, &gdb_connection->target_desc,
2384 &xml, offset, length);
2385 if (retval != ERROR_OK) {
2386 gdb_error(connection, retval);
2387 return retval;
2388 }
2389
2390 gdb_put_packet(connection, xml, strlen(xml));
2391
2392 free(xml);
2393 return ERROR_OK;
2394 } else if (strncmp(packet, "QStartNoAckMode", 15) == 0) {
2395 gdb_connection->noack_mode = 1;
2396 gdb_put_packet(connection, "OK", 2);
2397 return ERROR_OK;
2398 }
2399
2400 gdb_put_packet(connection, "", 0);
2401 return ERROR_OK;
2402 }
2403
2404 static int gdb_v_packet(struct connection *connection,
2405 char *packet, int packet_size)
2406 {
2407 struct gdb_connection *gdb_connection = connection->priv;
2408 struct gdb_service *gdb_service = connection->service->priv;
2409 int result;
2410
2411 /* if flash programming disabled - send a empty reply */
2412
2413 if (gdb_flash_program == 0) {
2414 gdb_put_packet(connection, "", 0);
2415 return ERROR_OK;
2416 }
2417
2418 if (strncmp(packet, "vFlashErase:", 12) == 0) {
2419 unsigned long addr;
2420 unsigned long length;
2421
2422 char *parse = packet + 12;
2423 if (*parse == '\0') {
2424 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2425 return ERROR_SERVER_REMOTE_CLOSED;
2426 }
2427
2428 addr = strtoul(parse, &parse, 16);
2429
2430 if (*(parse++) != ',' || *parse == '\0') {
2431 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2432 return ERROR_SERVER_REMOTE_CLOSED;
2433 }
2434
2435 length = strtoul(parse, &parse, 16);
2436
2437 if (*parse != '\0') {
2438 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2439 return ERROR_SERVER_REMOTE_CLOSED;
2440 }
2441
2442 /* assume all sectors need erasing - stops any problems
2443 * when flash_write is called multiple times */
2444 flash_set_dirty();
2445
2446 /* perform any target specific operations before the erase */
2447 target_call_event_callbacks(gdb_service->target,
2448 TARGET_EVENT_GDB_FLASH_ERASE_START);
2449
2450 /* vFlashErase:addr,length messages require region start and
2451 * end to be "block" aligned ... if padding is ever needed,
2452 * GDB will have become dangerously confused.
2453 */
2454 result = flash_erase_address_range(gdb_service->target,
2455 false, addr, length);
2456
2457 /* perform any target specific operations after the erase */
2458 target_call_event_callbacks(gdb_service->target,
2459 TARGET_EVENT_GDB_FLASH_ERASE_END);
2460
2461 /* perform erase */
2462 if (result != ERROR_OK) {
2463 /* GDB doesn't evaluate the actual error number returned,
2464 * treat a failed erase as an I/O error
2465 */
2466 gdb_send_error(connection, EIO);
2467 LOG_ERROR("flash_erase returned %i", result);
2468 } else
2469 gdb_put_packet(connection, "OK", 2);
2470
2471 return ERROR_OK;
2472 }
2473
2474 if (strncmp(packet, "vFlashWrite:", 12) == 0) {
2475 int retval;
2476 unsigned long addr;
2477 unsigned long length;
2478 char *parse = packet + 12;
2479
2480 if (*parse == '\0') {
2481 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2482 return ERROR_SERVER_REMOTE_CLOSED;
2483 }
2484 addr = strtoul(parse, &parse, 16);
2485 if (*(parse++) != ':') {
2486 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2487 return ERROR_SERVER_REMOTE_CLOSED;
2488 }
2489 length = packet_size - (parse - packet);
2490
2491 /* create a new image if there isn't already one */
2492 if (gdb_connection->vflash_image == NULL) {
2493 gdb_connection->vflash_image = malloc(sizeof(struct image));
2494 image_open(gdb_connection->vflash_image, "", "build");
2495 }
2496
2497 /* create new section with content from packet buffer */
2498 retval = image_add_section(gdb_connection->vflash_image,
2499 addr, length, 0x0, (uint8_t *)parse);
2500 if (retval != ERROR_OK)
2501 return retval;
2502
2503 gdb_put_packet(connection, "OK", 2);
2504
2505 return ERROR_OK;
2506 }
2507
2508 if (strncmp(packet, "vFlashDone", 10) == 0) {
2509 uint32_t written;
2510
2511 /* process the flashing buffer. No need to erase as GDB
2512 * always issues a vFlashErase first. */
2513 target_call_event_callbacks(gdb_service->target,
2514 TARGET_EVENT_GDB_FLASH_WRITE_START);
2515 result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
2516 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
2517 if (result != ERROR_OK) {
2518 if (result == ERROR_FLASH_DST_OUT_OF_BANK)
2519 gdb_put_packet(connection, "E.memtype", 9);
2520 else
2521 gdb_send_error(connection, EIO);
2522 } else {
2523 LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
2524 gdb_put_packet(connection, "OK", 2);
2525 }
2526
2527 image_close(gdb_connection->vflash_image);
2528 free(gdb_connection->vflash_image);
2529 gdb_connection->vflash_image = NULL;
2530
2531 return ERROR_OK;
2532 }
2533
2534 gdb_put_packet(connection, "", 0);
2535 return ERROR_OK;
2536 }
2537
2538 static int gdb_detach(struct connection *connection)
2539 {
2540 struct gdb_service *gdb_service = connection->service->priv;
2541
2542 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
2543
2544 return gdb_put_packet(connection, "OK", 2);
2545 }
2546
2547 /* The format of 'F' response packet is
2548 * Fretcode,errno,Ctrl-C flag;call-specific attachment
2549 */
2550 static int gdb_fileio_response_packet(struct connection *connection,
2551 char *packet, int packet_size)
2552 {
2553 struct target *target = get_target_from_connection(connection);
2554 char *separator;
2555 char *parsing_point;
2556 int fileio_retcode = strtoul(packet + 1, &separator, 16);
2557 int fileio_errno = 0;
2558 bool fileio_ctrl_c = false;
2559 int retval;
2560
2561 LOG_DEBUG("-");
2562
2563 if (*separator == ',') {
2564 parsing_point = separator + 1;
2565 fileio_errno = strtoul(parsing_point, &separator, 16);
2566 if (*separator == ',') {
2567 if (*(separator + 1) == 'C') {
2568 /* TODO: process ctrl-c */
2569 fileio_ctrl_c = true;
2570 }
2571 }
2572 }
2573
2574 LOG_DEBUG("File-I/O response, retcode: 0x%x, errno: 0x%x, ctrl-c: %s",
2575 fileio_retcode, fileio_errno, fileio_ctrl_c ? "true" : "false");
2576
2577 retval = target_gdb_fileio_end(target, fileio_retcode, fileio_errno, fileio_ctrl_c);
2578 if (retval != ERROR_OK)
2579 return ERROR_FAIL;
2580
2581 /* After File-I/O ends, keep continue or step */
2582 if (gdb_running_type == 'c')
2583 retval = target_resume(target, 1, 0x0, 0, 0);
2584 else if (gdb_running_type == 's')
2585 retval = target_step(target, 1, 0x0, 0);
2586 else
2587 retval = ERROR_FAIL;
2588
2589 if (retval != ERROR_OK)
2590 return ERROR_FAIL;
2591
2592 return ERROR_OK;
2593 }
2594
2595 static void gdb_log_callback(void *priv, const char *file, unsigned line,
2596 const char *function, const char *string)
2597 {
2598 struct connection *connection = priv;
2599 struct gdb_connection *gdb_con = connection->priv;
2600
2601 if (gdb_con->busy) {
2602 /* do not reply this using the O packet */
2603 return;
2604 }
2605
2606 gdb_output_con(connection, string);
2607 }
2608
2609 static void gdb_sig_halted(struct connection *connection)
2610 {
2611 char sig_reply[4];
2612 snprintf(sig_reply, 4, "T%2.2x", 2);
2613 gdb_put_packet(connection, sig_reply, 3);
2614 }
2615
2616 static int gdb_input_inner(struct connection *connection)
2617 {
2618 /* Do not allocate this on the stack */
2619 static char gdb_packet_buffer[GDB_BUFFER_SIZE];
2620
2621 struct gdb_service *gdb_service = connection->service->priv;
2622 struct target *target = gdb_service->target;
2623 char *packet = gdb_packet_buffer;
2624 int packet_size;
2625 int retval;
2626 struct gdb_connection *gdb_con = connection->priv;
2627 static int extended_protocol;
2628
2629 /* drain input buffer. If one of the packets fail, then an error
2630 * packet is replied, if applicable.
2631 *
2632 * This loop will terminate and the error code is returned.
2633 *
2634 * The calling fn will check if this error is something that
2635 * can be recovered from, or if the connection must be closed.
2636 *
2637 * If the error is recoverable, this fn is called again to
2638 * drain the rest of the buffer.
2639 */
2640 do {
2641 packet_size = GDB_BUFFER_SIZE-1;
2642 retval = gdb_get_packet(connection, packet, &packet_size);
2643 if (retval != ERROR_OK)
2644 return retval;
2645
2646 /* terminate with zero */
2647 packet[packet_size] = 0;
2648
2649 if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
2650 if (packet[0] == 'X') {
2651 /* binary packets spew junk into the debug log stream */
2652 char buf[50];
2653 int x;
2654 for (x = 0; (x < 49) && (packet[x] != ':'); x++)
2655 buf[x] = packet[x];
2656 buf[x] = 0;
2657 LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
2658 } else
2659 LOG_DEBUG("received packet: '%s'", packet);
2660 }
2661
2662 if (packet_size > 0) {
2663 retval = ERROR_OK;
2664 switch (packet[0]) {
2665 case 'T': /* Is thread alive? */
2666 gdb_thread_packet(connection, packet, packet_size);
2667 break;
2668 case 'H': /* Set current thread ( 'c' for step and continue,
2669 * 'g' for all other operations ) */
2670 gdb_thread_packet(connection, packet, packet_size);
2671 break;
2672 case 'q':
2673 case 'Q':
2674 retval = gdb_thread_packet(connection, packet, packet_size);
2675 if (retval == GDB_THREAD_PACKET_NOT_CONSUMED)
2676 retval = gdb_query_packet(connection, packet, packet_size);
2677 break;
2678 case 'g':
2679 retval = gdb_get_registers_packet(connection, packet, packet_size);
2680 break;
2681 case 'G':
2682 retval = gdb_set_registers_packet(connection, packet, packet_size);
2683 break;
2684 case 'p':
2685 retval = gdb_get_register_packet(connection, packet, packet_size);
2686 break;
2687 case 'P':
2688 retval = gdb_set_register_packet(connection, packet, packet_size);
2689 break;
2690 case 'm':
2691 retval = gdb_read_memory_packet(connection, packet, packet_size);
2692 break;
2693 case 'M':
2694 retval = gdb_write_memory_packet(connection, packet, packet_size);
2695 break;
2696 case 'z':
2697 case 'Z':
2698 retval = gdb_breakpoint_watchpoint_packet(connection, packet, packet_size);
2699 break;
2700 case '?':
2701 gdb_last_signal_packet(connection, packet, packet_size);
2702 break;
2703 case 'c':
2704 case 's':
2705 {
2706 gdb_thread_packet(connection, packet, packet_size);
2707 log_add_callback(gdb_log_callback, connection);
2708
2709 if (gdb_con->mem_write_error) {
2710 LOG_ERROR("Memory write failure!");
2711
2712 /* now that we have reported the memory write error,
2713 * we can clear the condition */
2714 gdb_con->mem_write_error = false;
2715 }
2716
2717 bool nostep = false;
2718 bool already_running = false;
2719 if (target->state == TARGET_RUNNING) {
2720 LOG_WARNING("WARNING! The target is already running. "
2721 "All changes GDB did to registers will be discarded! "
2722 "Waiting for target to halt.");
2723 already_running = true;
2724 } else if (target->state != TARGET_HALTED) {
2725 LOG_WARNING("The target is not in the halted nor running stated, " \
2726 "stepi/continue ignored.");
2727 nostep = true;
2728 } else if ((packet[0] == 's') && gdb_con->sync) {
2729 /* Hmm..... when you issue a continue in GDB, then a "stepi" is
2730 * sent by GDB first to OpenOCD, thus defeating the check to
2731 * make only the single stepping have the sync feature...
2732 */
2733 nostep = true;
2734 LOG_WARNING("stepi ignored. GDB will now fetch the register state " \
2735 "from the target.");
2736 }
2737 gdb_con->sync = false;
2738
2739 if (!already_running && nostep) {
2740 /* Either the target isn't in the halted state, then we can't
2741 * step/continue. This might be early setup, etc.
2742 *
2743 * Or we want to allow GDB to pick up a fresh set of
2744 * register values without modifying the target state.
2745 *
2746 */
2747 gdb_sig_halted(connection);
2748
2749 /* stop forwarding log packets! */
2750 log_remove_callback(gdb_log_callback, connection);
2751 } else {
2752 /* We're running/stepping, in which case we can
2753 * forward log output until the target is halted
2754 */
2755 gdb_con->frontend_state = TARGET_RUNNING;
2756 target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
2757
2758 if (!already_running) {
2759 /* Here we don't want packet processing to stop even if this fails,
2760 * so we use a local variable instead of retval. */
2761 retval = gdb_step_continue_packet(connection, packet, packet_size);
2762 if (retval != ERROR_OK) {
2763 /* we'll never receive a halted
2764 * condition... issue a false one..
2765 */
2766 gdb_frontend_halted(target, connection);
2767 }
2768 }
2769 }
2770 }
2771 break;
2772 case 'v':
2773 retval = gdb_v_packet(connection, packet, packet_size);
2774 break;
2775 case 'D':
2776 retval = gdb_detach(connection);
2777 extended_protocol = 0;
2778 break;
2779 case 'X':
2780 retval = gdb_write_memory_binary_packet(connection, packet, packet_size);
2781 if (retval != ERROR_OK)
2782 return retval;
2783 break;
2784 case 'k':
2785 if (extended_protocol != 0) {
2786 gdb_con->attached = false;
2787 break;
2788 }
2789 gdb_put_packet(connection, "OK", 2);
2790 return ERROR_SERVER_REMOTE_CLOSED;
2791 case '!':
2792 /* handle extended remote protocol */
2793 extended_protocol = 1;
2794 gdb_put_packet(connection, "OK", 2);
2795 break;
2796 case 'R':
2797 /* handle extended restart packet */
2798 breakpoint_clear_target(gdb_service->target);
2799 watchpoint_clear_target(gdb_service->target);
2800 command_run_linef(connection->cmd_ctx, "ocd_gdb_restart %s",
2801 target_name(target));
2802 /* set connection as attached after reset */
2803 gdb_con->attached = true;
2804 /* info rtos parts */
2805 gdb_thread_packet(connection, packet, packet_size);
2806 break;
2807
2808 case 'j':
2809 /* packet supported only by smp target i.e cortex_a.c*/
2810 /* handle smp packet replying coreid played to gbd */
2811 gdb_read_smp_packet(connection, packet, packet_size);
2812 break;
2813
2814 case 'J':
2815 /* packet supported only by smp target i.e cortex_a.c */
2816 /* handle smp packet setting coreid to be played at next
2817 * resume to gdb */
2818 gdb_write_smp_packet(connection, packet, packet_size);
2819 break;
2820
2821 case 'F':
2822 /* File-I/O extension */
2823 /* After gdb uses host-side syscall to complete target file
2824 * I/O, gdb sends host-side syscall return value to target
2825 * by 'F' packet.
2826 * The format of 'F' response packet is
2827 * Fretcode,errno,Ctrl-C flag;call-specific attachment
2828 */
2829 gdb_con->frontend_state = TARGET_RUNNING;
2830 log_add_callback(gdb_log_callback, connection);
2831 gdb_fileio_response_packet(connection, packet, packet_size);
2832 break;
2833
2834 default:
2835 /* ignore unknown packets */
2836 LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
2837 gdb_put_packet(connection, NULL, 0);
2838 break;
2839 }
2840
2841 /* if a packet handler returned an error, exit input loop */
2842 if (retval != ERROR_OK)
2843 return retval;
2844 }
2845
2846 if (gdb_con->ctrl_c) {
2847 if (target->state == TARGET_RUNNING) {
2848 retval = target_halt(target);
2849 if (retval != ERROR_OK)
2850 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2851 gdb_con->ctrl_c = 0;
2852 } else {
2853 LOG_INFO("The target is not running when halt was requested, stopping GDB.");
2854 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2855 }
2856 }
2857
2858 } while (gdb_con->buf_cnt > 0);
2859
2860 return ERROR_OK;
2861 }
2862
2863 static int gdb_input(struct connection *connection)
2864 {
2865 int retval = gdb_input_inner(connection);
2866 struct gdb_connection *gdb_con = connection->priv;
2867 if (retval == ERROR_SERVER_REMOTE_CLOSED)
2868 return retval;
2869
2870 /* logging does not propagate the error, yet can set the gdb_con->closed flag */
2871 if (gdb_con->closed)
2872 return ERROR_SERVER_REMOTE_CLOSED;
2873
2874 /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
2875 return ERROR_OK;
2876 }
2877
2878 static int gdb_target_start(struct target *target, const char *port)
2879 {
2880 struct gdb_service *gdb_service;
2881 int ret;
2882 gdb_service = malloc(sizeof(struct gdb_service));
2883
2884 if (NULL == gdb_service)
2885 return -ENOMEM;
2886
2887 gdb_service->target = target;
2888 gdb_service->core[0] = -1;
2889 gdb_service->core[1] = -1;
2890 target->gdb_service = gdb_service;
2891
2892 ret = add_service("gdb",
2893 port, 1, &gdb_new_connection, &gdb_input,
2894 &gdb_connection_closed, gdb_service);
2895 /* initialialize all targets gdb service with the same pointer */
2896 {
2897 struct target_list *head;
2898 struct target *curr;
2899 head = target->head;
2900 while (head != (struct target_list *)NULL) {
2901 curr = head->target;
2902 if (curr != target)
2903 curr->gdb_service = gdb_service;
2904 head = head->next;
2905 }
2906 }
2907 return ret;
2908 }
2909
2910 static int gdb_target_add_one(struct target *target)
2911 {
2912 /* one gdb instance per smp list */
2913 if ((target->smp) && (target->gdb_service))
2914 return ERROR_OK;
2915 int retval = gdb_target_start(target, gdb_port_next);
2916 if (retval == ERROR_OK) {
2917 long portnumber;
2918 /* If we can parse the port number
2919 * then we increment the port number for the next target.
2920 */
2921 char *end;
2922 portnumber = strtol(gdb_port_next, &end, 0);
2923 if (!*end) {
2924 if (parse_long(gdb_port_next, &portnumber) == ERROR_OK) {
2925 free(gdb_port_next);
2926 gdb_port_next = alloc_printf("%d", portnumber+1);
2927 }
2928 }
2929 }
2930 return retval;
2931 }
2932
2933 int gdb_target_add_all(struct target *target)
2934 {
2935 if (NULL == target) {
2936 LOG_WARNING("gdb services need one or more targets defined");
2937 return ERROR_OK;
2938 }
2939
2940 while (NULL != target) {
2941 int retval = gdb_target_add_one(target);
2942 if (ERROR_OK != retval)
2943 return retval;
2944
2945 target = target->next;
2946 }
2947
2948 return ERROR_OK;
2949 }
2950
2951 COMMAND_HANDLER(handle_gdb_sync_command)
2952 {
2953 if (CMD_ARGC != 0)
2954 return ERROR_COMMAND_SYNTAX_ERROR;
2955
2956 if (current_gdb_connection == NULL) {
2957 command_print(CMD_CTX,
2958 "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
2959 return ERROR_FAIL;
2960 }
2961
2962 current_gdb_connection->sync = true;
2963
2964 return ERROR_OK;
2965 }
2966
2967 /* daemon configuration command gdb_port */
2968 COMMAND_HANDLER(handle_gdb_port_command)
2969 {
2970 int retval = CALL_COMMAND_HANDLER(server_pipe_command, &gdb_port);
2971 if (ERROR_OK == retval) {
2972 free(gdb_port_next);
2973 gdb_port_next = strdup(gdb_port);
2974 }
2975 return retval;
2976 }
2977
2978 COMMAND_HANDLER(handle_gdb_memory_map_command)
2979 {
2980 if (CMD_ARGC != 1)
2981 return ERROR_COMMAND_SYNTAX_ERROR;
2982
2983 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map);
2984 return ERROR_OK;
2985 }
2986
2987 COMMAND_HANDLER(handle_gdb_flash_program_command)
2988 {
2989 if (CMD_ARGC != 1)
2990 return ERROR_COMMAND_SYNTAX_ERROR;
2991
2992 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program);
2993 return ERROR_OK;
2994 }
2995
2996 COMMAND_HANDLER(handle_gdb_report_data_abort_command)
2997 {
2998 if (CMD_ARGC != 1)
2999 return ERROR_COMMAND_SYNTAX_ERROR;
3000
3001 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort);
3002 return ERROR_OK;
3003 }
3004
3005 /* gdb_breakpoint_override */
3006 COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
3007 {
3008 if (CMD_ARGC == 0) {
3009 /* nothing */
3010 } else if (CMD_ARGC == 1) {
3011 gdb_breakpoint_override = 1;
3012 if (strcmp(CMD_ARGV[0], "hard") == 0)
3013 gdb_breakpoint_override_type = BKPT_HARD;
3014 else if (strcmp(CMD_ARGV[0], "soft") == 0)
3015 gdb_breakpoint_override_type = BKPT_SOFT;
3016 else if (strcmp(CMD_ARGV[0], "disable") == 0)
3017 gdb_breakpoint_override = 0;
3018 } else
3019 return ERROR_COMMAND_SYNTAX_ERROR;
3020 if (gdb_breakpoint_override)
3021 LOG_USER("force %s breakpoints",
3022 (gdb_breakpoint_override_type == BKPT_HARD) ? "hard" : "soft");
3023 else
3024 LOG_USER("breakpoint type is not overridden");
3025
3026 return ERROR_OK;
3027 }
3028
3029 COMMAND_HANDLER(handle_gdb_target_description_command)
3030 {
3031 if (CMD_ARGC != 1)
3032 return ERROR_COMMAND_SYNTAX_ERROR;
3033
3034 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_target_description);
3035 return ERROR_OK;
3036 }
3037
3038 COMMAND_HANDLER(handle_gdb_save_tdesc_command)
3039 {
3040 char *tdesc;
3041 uint32_t tdesc_length;
3042 struct target *target = get_current_target(CMD_CTX);
3043
3044 int retval = gdb_generate_target_description(target, &tdesc);
3045 if (retval != ERROR_OK) {
3046 LOG_ERROR("Unable to Generate Target Description");
3047 return ERROR_FAIL;
3048 }
3049
3050 tdesc_length = strlen(tdesc);
3051
3052 struct fileio fileio;
3053 size_t size_written;
3054
3055 char *tdesc_filename = alloc_printf("%s.xml", target_type_name(target));
3056 if (tdesc_filename == NULL) {
3057 retval = ERROR_FAIL;
3058 goto out;
3059 }
3060
3061 retval = fileio_open(&fileio, tdesc_filename, FILEIO_WRITE, FILEIO_TEXT);
3062
3063 if (retval != ERROR_OK) {
3064 LOG_ERROR("Can't open %s for writing", tdesc_filename);
3065 goto out;
3066 }
3067
3068 retval = fileio_write(&fileio, tdesc_length, tdesc, &size_written);
3069
3070 fileio_close(&fileio);
3071
3072 if (retval != ERROR_OK)
3073 LOG_ERROR("Error while writing the tdesc file");
3074
3075 out:
3076 free(tdesc_filename);
3077 free(tdesc);
3078
3079 return retval;
3080 }
3081
3082 static const struct command_registration gdb_command_handlers[] = {
3083 {
3084 .name = "gdb_sync",
3085 .handler = handle_gdb_sync_command,
3086 .mode = COMMAND_ANY,
3087 .help = "next stepi will return immediately allowing "
3088 "GDB to fetch register state without affecting "
3089 "target state",
3090 .usage = ""
3091 },
3092 {
3093 .name = "gdb_port",
3094 .handler = handle_gdb_port_command,
3095 .mode = COMMAND_ANY,
3096 .help = "Normally gdb listens to a TCP/IP port. Each subsequent GDB "
3097 "server listens for the next port number after the "
3098 "base port number specified. "
3099 "No arguments reports GDB port. \"pipe\" means listen to stdin "
3100 "output to stdout, an integer is base port number, \"disable\" disables "
3101 "port. Any other string is are interpreted as named pipe to listen to. "
3102 "Output pipe is the same name as input pipe, but with 'o' appended.",
3103 .usage = "[port_num]",
3104 },
3105 {
3106 .name = "gdb_memory_map",
3107 .handler = handle_gdb_memory_map_command,
3108 .mode = COMMAND_CONFIG,
3109 .help = "enable or disable memory map",
3110 .usage = "('enable'|'disable')"
3111 },
3112 {
3113 .name = "gdb_flash_program",
3114 .handler = handle_gdb_flash_program_command,
3115 .mode = COMMAND_CONFIG,
3116 .help = "enable or disable flash program",
3117 .usage = "('enable'|'disable')"
3118 },
3119 {
3120 .name = "gdb_report_data_abort",
3121 .handler = handle_gdb_report_data_abort_command,
3122 .mode = COMMAND_CONFIG,
3123 .help = "enable or disable reporting data aborts",
3124 .usage = "('enable'|'disable')"
3125 },
3126 {
3127 .name = "gdb_breakpoint_override",
3128 .handler = handle_gdb_breakpoint_override_command,
3129 .mode = COMMAND_ANY,
3130 .help = "Display or specify type of breakpoint "
3131 "to be used by gdb 'break' commands.",
3132 .usage = "('hard'|'soft'|'disable')"
3133 },
3134 {
3135 .name = "gdb_target_description",
3136 .handler = handle_gdb_target_description_command,
3137 .mode = COMMAND_CONFIG,
3138 .help = "enable or disable target description",
3139 .usage = "('enable'|'disable')"
3140 },
3141 {
3142 .name = "gdb_save_tdesc",
3143 .handler = handle_gdb_save_tdesc_command,
3144 .mode = COMMAND_EXEC,
3145 .help = "Save the target description file",
3146 },
3147 COMMAND_REGISTRATION_DONE
3148 };
3149
3150 int gdb_register_commands(struct command_context *cmd_ctx)
3151 {
3152 gdb_port = strdup("3333");
3153 gdb_port_next = strdup("3333");
3154 return register_commands(cmd_ctx, NULL, gdb_command_handlers);
3155 }
Official OpenOCD Mirror