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gdb_server: Don't modify "buf" argument in decode_xfer_read()
[openocd.git] / src / server / gdb_server.c
blob0b28287d80a7c8ee22f69a7f18d72ad3e69f0162
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 address = strtoul(packet + 1, NULL, 16);
1527 else
1528 current = 1;
1529
1530 gdb_running_type = packet[0];
1531 if (packet[0] == 'c') {
1532 LOG_DEBUG("continue");
1533 /* resume at current address, don't handle breakpoints, not debugging */
1534 retval = target_resume(target, current, address, 0, 0);
1535 } else if (packet[0] == 's') {
1536 LOG_DEBUG("step");
1537 /* step at current or address, don't handle breakpoints */
1538 retval = target_step(target, current, address, 0);
1539 }
1540 return retval;
1541 }
1542
1543 static int gdb_breakpoint_watchpoint_packet(struct connection *connection,
1544 char *packet, int packet_size)
1545 {
1546 struct target *target = get_target_from_connection(connection);
1547 int type;
1548 enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
1549 enum watchpoint_rw wp_type = WPT_READ /* dummy init to avoid warning */;
1550 uint32_t address;
1551 uint32_t size;
1552 char *separator;
1553 int retval;
1554
1555 LOG_DEBUG("-");
1556
1557 type = strtoul(packet + 1, &separator, 16);
1558
1559 if (type == 0) /* memory breakpoint */
1560 bp_type = BKPT_SOFT;
1561 else if (type == 1) /* hardware breakpoint */
1562 bp_type = BKPT_HARD;
1563 else if (type == 2) /* write watchpoint */
1564 wp_type = WPT_WRITE;
1565 else if (type == 3) /* read watchpoint */
1566 wp_type = WPT_READ;
1567 else if (type == 4) /* access watchpoint */
1568 wp_type = WPT_ACCESS;
1569 else {
1570 LOG_ERROR("invalid gdb watch/breakpoint type(%d), dropping connection", type);
1571 return ERROR_SERVER_REMOTE_CLOSED;
1572 }
1573
1574 if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT) || (bp_type == BKPT_HARD)))
1575 bp_type = gdb_breakpoint_override_type;
1576
1577 if (*separator != ',') {
1578 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1579 return ERROR_SERVER_REMOTE_CLOSED;
1580 }
1581
1582 address = strtoul(separator + 1, &separator, 16);
1583
1584 if (*separator != ',') {
1585 LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
1586 return ERROR_SERVER_REMOTE_CLOSED;
1587 }
1588
1589 size = strtoul(separator + 1, &separator, 16);
1590
1591 switch (type) {
1592 case 0:
1593 case 1:
1594 if (packet[0] == 'Z') {
1595 retval = breakpoint_add(target, address, size, bp_type);
1596 if (retval != ERROR_OK) {
1597 retval = gdb_error(connection, retval);
1598 if (retval != ERROR_OK)
1599 return retval;
1600 } else
1601 gdb_put_packet(connection, "OK", 2);
1602 } else {
1603 breakpoint_remove(target, address);
1604 gdb_put_packet(connection, "OK", 2);
1605 }
1606 break;
1607 case 2:
1608 case 3:
1609 case 4:
1610 {
1611 if (packet[0] == 'Z') {
1612 retval = watchpoint_add(target, address, size, wp_type, 0, 0xffffffffu);
1613 if (retval != ERROR_OK) {
1614 retval = gdb_error(connection, retval);
1615 if (retval != ERROR_OK)
1616 return retval;
1617 } else
1618 gdb_put_packet(connection, "OK", 2);
1619 } else {
1620 watchpoint_remove(target, address);
1621 gdb_put_packet(connection, "OK", 2);
1622 }
1623 break;
1624 }
1625 default:
1626 break;
1627 }
1628
1629 return ERROR_OK;
1630 }
1631
1632 /* print out a string and allocate more space as needed,
1633 * mainly used for XML at this point
1634 */
1635 static void xml_printf(int *retval, char **xml, int *pos, int *size,
1636 const char *fmt, ...)
1637 {
1638 if (*retval != ERROR_OK)
1639 return;
1640 int first = 1;
1641
1642 for (;; ) {
1643 if ((*xml == NULL) || (!first)) {
1644 /* start by 0 to exercise all the code paths.
1645 * Need minimum 2 bytes to fit 1 char and 0 terminator. */
1646
1647 *size = *size * 2 + 2;
1648 char *t = *xml;
1649 *xml = realloc(*xml, *size);
1650 if (*xml == NULL) {
1651 if (t)
1652 free(t);
1653 *retval = ERROR_SERVER_REMOTE_CLOSED;
1654 return;
1655 }
1656 }
1657
1658 va_list ap;
1659 int ret;
1660 va_start(ap, fmt);
1661 ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
1662 va_end(ap);
1663 if ((ret > 0) && ((ret + 1) < *size - *pos)) {
1664 *pos += ret;
1665 return;
1666 }
1667 /* there was just enough or not enough space, allocate more. */
1668 first = 0;
1669 }
1670 }
1671
1672 static int decode_xfer_read(char *_buf, char **annex, int *ofs, unsigned int *len)
1673 {
1674 int ret = 0;
1675 char *buf = strdup(_buf);
1676 char *_annex;
1677 char *separator;
1678
1679 /* Extract and NUL-terminate the annex. */
1680 _annex = buf;
1681 while (*buf && *buf != ':')
1682 buf++;
1683 if (*buf == '\0') {
1684 ret = -1;
1685 goto out;
1686 }
1687 *buf++ = 0;
1688
1689 /* Return annex as copy because "buf" will be freed in this function */
1690 *annex = strdup(_annex);
1691
1692 /* After the read marker and annex, qXfer looks like a
1693 * traditional 'm' packet. */
1694
1695 *ofs = strtoul(buf, &separator, 16);
1696
1697 if (*separator != ',') {
1698 ret = -1;
1699 goto out;
1700 }
1701
1702 *len = strtoul(separator + 1, NULL, 16);
1703
1704 out:
1705 free(buf);
1706 return ret;
1707 }
1708
1709 static int compare_bank(const void *a, const void *b)
1710 {
1711 struct flash_bank *b1, *b2;
1712 b1 = *((struct flash_bank **)a);
1713 b2 = *((struct flash_bank **)b);
1714
1715 if (b1->base == b2->base)
1716 return 0;
1717 else if (b1->base > b2->base)
1718 return 1;
1719 else
1720 return -1;
1721 }
1722
1723 static int gdb_memory_map(struct connection *connection,
1724 char *packet, int packet_size)
1725 {
1726 /* We get away with only specifying flash here. Regions that are not
1727 * specified are treated as if we provided no memory map(if not we
1728 * could detect the holes and mark them as RAM).
1729 * Normally we only execute this code once, but no big deal if we
1730 * have to regenerate it a couple of times.
1731 */
1732
1733 struct target *target = get_target_from_connection(connection);
1734 struct flash_bank *p;
1735 char *xml = NULL;
1736 int size = 0;
1737 int pos = 0;
1738 int retval = ERROR_OK;
1739 struct flash_bank **banks;
1740 int offset;
1741 int length;
1742 char *separator;
1743 uint32_t ram_start = 0;
1744 int i;
1745 int target_flash_banks = 0;
1746
1747 /* skip command character */
1748 packet += 23;
1749
1750 offset = strtoul(packet, &separator, 16);
1751 length = strtoul(separator + 1, &separator, 16);
1752
1753 xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");
1754
1755 /* Sort banks in ascending order. We need to report non-flash
1756 * memory as ram (or rather read/write) by default for GDB, since
1757 * it has no concept of non-cacheable read/write memory (i/o etc).
1758 *
1759 * FIXME Most non-flash addresses are *NOT* RAM! Don't lie.
1760 * Current versions of GDB assume unlisted addresses are RAM...
1761 */
1762 banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
1763
1764 for (i = 0; i < flash_get_bank_count(); i++) {
1765 p = get_flash_bank_by_num_noprobe(i);
1766 if (p->target != target)
1767 continue;
1768 retval = get_flash_bank_by_num(i, &p);
1769 if (retval != ERROR_OK) {
1770 free(banks);
1771 gdb_error(connection, retval);
1772 return retval;
1773 }
1774 banks[target_flash_banks++] = p;
1775 }
1776
1777 qsort(banks, target_flash_banks, sizeof(struct flash_bank *),
1778 compare_bank);
1779
1780 for (i = 0; i < target_flash_banks; i++) {
1781 int j;
1782 unsigned sector_size = 0;
1783 uint32_t start;
1784
1785 p = banks[i];
1786 start = p->base;
1787
1788 if (ram_start < p->base)
1789 xml_printf(&retval, &xml, &pos, &size,
1790 "<memory type=\"ram\" start=\"0x%x\" "
1791 "length=\"0x%x\"/>\n",
1792 ram_start, p->base - ram_start);
1793
1794 /* Report adjacent groups of same-size sectors. So for
1795 * example top boot CFI flash will list an initial region
1796 * with several large sectors (maybe 128KB) and several
1797 * smaller ones at the end (maybe 32KB). STR7 will have
1798 * regions with 8KB, 32KB, and 64KB sectors; etc.
1799 */
1800 for (j = 0; j < p->num_sectors; j++) {
1801 unsigned group_len;
1802
1803 /* Maybe start a new group of sectors. */
1804 if (sector_size == 0) {
1805 start = p->base + p->sectors[j].offset;
1806 xml_printf(&retval, &xml, &pos, &size,
1807 "<memory type=\"flash\" "
1808 "start=\"0x%x\" ",
1809 start);
1810 sector_size = p->sectors[j].size;
1811 }
1812
1813 /* Does this finish a group of sectors?
1814 * If not, continue an already-started group.
1815 */
1816 if (j == p->num_sectors - 1)
1817 group_len = (p->base + p->size) - start;
1818 else if (p->sectors[j + 1].size != sector_size)
1819 group_len = p->base + p->sectors[j + 1].offset
1820 - start;
1821 else
1822 continue;
1823
1824 xml_printf(&retval, &xml, &pos, &size,
1825 "length=\"0x%x\">\n"
1826 "<property name=\"blocksize\">"
1827 "0x%x</property>\n"
1828 "</memory>\n",
1829 group_len,
1830 sector_size);
1831 sector_size = 0;
1832 }
1833
1834 ram_start = p->base + p->size;
1835 }
1836
1837 if (ram_start != 0)
1838 xml_printf(&retval, &xml, &pos, &size,
1839 "<memory type=\"ram\" start=\"0x%x\" "
1840 "length=\"0x%x\"/>\n",
1841 ram_start, 0-ram_start);
1842 /* ELSE a flash chip could be at the very end of the 32 bit address
1843 * space, in which case ram_start will be precisely 0
1844 */
1845
1846 free(banks);
1847 banks = NULL;
1848
1849 xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");
1850
1851 if (retval != ERROR_OK) {
1852 gdb_error(connection, retval);
1853 return retval;
1854 }
1855
1856 if (offset + length > pos)
1857 length = pos - offset;
1858
1859 char *t = malloc(length + 1);
1860 t[0] = 'l';
1861 memcpy(t + 1, xml + offset, length);
1862 gdb_put_packet(connection, t, length + 1);
1863
1864 free(t);
1865 free(xml);
1866 return ERROR_OK;
1867 }
1868
1869 static const char *gdb_get_reg_type_name(enum reg_type type)
1870 {
1871 switch (type) {
1872 case REG_TYPE_INT:
1873 return "int";
1874 case REG_TYPE_INT8:
1875 return "int8";
1876 case REG_TYPE_INT16:
1877 return "int16";
1878 case REG_TYPE_INT32:
1879 return "int32";
1880 case REG_TYPE_INT64:
1881 return "int64";
1882 case REG_TYPE_INT128:
1883 return "int128";
1884 case REG_TYPE_UINT8:
1885 return "uint8";
1886 case REG_TYPE_UINT16:
1887 return "uint16";
1888 case REG_TYPE_UINT32:
1889 return "uint32";
1890 case REG_TYPE_UINT64:
1891 return "uint64";
1892 case REG_TYPE_UINT128:
1893 return "uint128";
1894 case REG_TYPE_CODE_PTR:
1895 return "code_ptr";
1896 case REG_TYPE_DATA_PTR:
1897 return "data_ptr";
1898 case REG_TYPE_FLOAT:
1899 return "float";
1900 case REG_TYPE_IEEE_SINGLE:
1901 return "ieee_single";
1902 case REG_TYPE_IEEE_DOUBLE:
1903 return "ieee_double";
1904 case REG_TYPE_ARCH_DEFINED:
1905 return "int"; /* return arbitrary string to avoid compile warning. */
1906 }
1907
1908 return "int"; /* "int" as default value */
1909 }
1910
1911 static int gdb_generate_reg_type_description(struct target *target,
1912 char **tdesc, int *pos, int *size, struct reg_data_type *type)
1913 {
1914 int retval = ERROR_OK;
1915
1916 if (type->type_class == REG_TYPE_CLASS_VECTOR) {
1917 /* <vector id="id" type="type" count="count"/> */
1918 xml_printf(&retval, tdesc, pos, size,
1919 "<vector id=\"%s\" type=\"%s\" count=\"%d\"/>\n",
1920 type->id, type->reg_type_vector->type->id,
1921 type->reg_type_vector->count);
1922
1923 } else if (type->type_class == REG_TYPE_CLASS_UNION) {
1924 /* <union id="id">
1925 * <field name="name" type="type"/> ...
1926 * </union> */
1927 xml_printf(&retval, tdesc, pos, size,
1928 "<union id=\"%s\">\n",
1929 type->id);
1930
1931 struct reg_data_type_union_field *field;
1932 field = type->reg_type_union->fields;
1933 while (field != NULL) {
1934 xml_printf(&retval, tdesc, pos, size,
1935 "<field name=\"%s\" type=\"%s\"/>\n",
1936 field->name, field->type->id);
1937
1938 field = field->next;
1939 }
1940
1941 xml_printf(&retval, tdesc, pos, size,
1942 "</union>\n");
1943
1944 } else if (type->type_class == REG_TYPE_CLASS_STRUCT) {
1945 struct reg_data_type_struct_field *field;
1946 field = type->reg_type_struct->fields;
1947
1948 if (field->use_bitfields) {
1949 /* <struct id="id" size="size">
1950 * <field name="name" start="start" end="end"/> ...
1951 * </struct> */
1952 xml_printf(&retval, tdesc, pos, size,
1953 "<struct id=\"%s\" size=\"%d\">\n",
1954 type->id, type->reg_type_struct->size);
1955 while (field != NULL) {
1956 xml_printf(&retval, tdesc, pos, size,
1957 "<field name=\"%s\" start=\"%d\" end=\"%d\"/>\n",
1958 field->name, field->bitfield->start,
1959 field->bitfield->end);
1960
1961 field = field->next;
1962 }
1963 } else {
1964 /* <struct id="id">
1965 * <field name="name" type="type"/> ...
1966 * </struct> */
1967 xml_printf(&retval, tdesc, pos, size,
1968 "<struct id=\"%s\">\n",
1969 type->id);
1970 while (field != NULL) {
1971 xml_printf(&retval, tdesc, pos, size,
1972 "<field name=\"%s\" type=\"%s\"/>\n",
1973 field->name, field->type->id);
1974
1975 field = field->next;
1976 }
1977 }
1978
1979 xml_printf(&retval, tdesc, pos, size,
1980 "</struct>\n");
1981
1982 } else if (type->type_class == REG_TYPE_CLASS_FLAGS) {
1983 /* <flags id="id" size="size">
1984 * <field name="name" start="start" end="end"/> ...
1985 * </flags> */
1986 xml_printf(&retval, tdesc, pos, size,
1987 "<flags id=\"%s\" size=\"%d\">\n",
1988 type->id, type->reg_type_flags->size);
1989
1990 struct reg_data_type_flags_field *field;
1991 field = type->reg_type_flags->fields;
1992 while (field != NULL) {
1993 xml_printf(&retval, tdesc, pos, size,
1994 "<field name=\"%s\" start=\"%d\" end=\"%d\"/>\n",
1995 field->name, field->bitfield->start, field->bitfield->end);
1996
1997 field = field->next;
1998 }
1999
2000 xml_printf(&retval, tdesc, pos, size,
2001 "</flags>\n");
2002
2003 }
2004
2005 return ERROR_OK;
2006 }
2007
2008 /* Get a list of available target registers features. feature_list must
2009 * be freed by caller.
2010 */
2011 static int get_reg_features_list(struct target *target, char **feature_list[], int *feature_list_size,
2012 struct reg **reg_list, int reg_list_size)
2013 {
2014 int tbl_sz = 0;
2015
2016 /* Start with only one element */
2017 *feature_list = calloc(1, sizeof(char *));
2018
2019 for (int i = 0; i < reg_list_size; i++) {
2020 if (reg_list[i]->exist == false)
2021 continue;
2022
2023 if (reg_list[i]->feature != NULL
2024 && reg_list[i]->feature->name != NULL
2025 && (strcmp(reg_list[i]->feature->name, ""))) {
2026 /* We found a feature, check if the feature is already in the
2027 * table. If not, allocate a new entry for the table and
2028 * put the new feature in it.
2029 */
2030 for (int j = 0; j < (tbl_sz + 1); j++) {
2031 if (!((*feature_list)[j])) {
2032 (*feature_list)[tbl_sz++] = strdup(reg_list[i]->feature->name);
2033 *feature_list = realloc(*feature_list, sizeof(char *) * (tbl_sz + 1));
2034 (*feature_list)[tbl_sz] = NULL;
2035 break;
2036 } else {
2037 if (!strcmp((*feature_list)[j], reg_list[i]->feature->name))
2038 break;
2039 }
2040 }
2041 }
2042 }
2043
2044 if (feature_list_size)
2045 *feature_list_size = tbl_sz;
2046
2047 return ERROR_OK;
2048 }
2049
2050 static int gdb_generate_target_description(struct target *target, char **tdesc_out)
2051 {
2052 int retval = ERROR_OK;
2053 struct reg **reg_list;
2054 int reg_list_size;
2055 char *tdesc = NULL;
2056 int pos = 0;
2057 int size = 0;
2058
2059 retval = target_get_gdb_reg_list(target, &reg_list,
2060 &reg_list_size, REG_CLASS_ALL);
2061
2062 if (retval != ERROR_OK) {
2063 LOG_ERROR("get register list failed");
2064 return ERROR_FAIL;
2065 }
2066
2067 if (reg_list_size <= 0) {
2068 free(reg_list);
2069 return ERROR_FAIL;
2070 }
2071
2072 char **features = NULL;
2073 /* Get a list of available target registers features */
2074 retval = get_reg_features_list(target, &features, NULL, reg_list, reg_list_size);
2075 if (retval != ERROR_OK) {
2076 LOG_ERROR("Can't get the registers feature list");
2077 free(reg_list);
2078 return ERROR_FAIL;
2079 }
2080
2081 /* If we found some features associated with registers, create sections */
2082 int current_feature = 0;
2083
2084 xml_printf(&retval, &tdesc, &pos, &size,
2085 "<?xml version=\"1.0\"?>\n"
2086 "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
2087 "<target version=\"1.0\">\n");
2088
2089 /* generate target description according to register list */
2090 if (features != NULL) {
2091 while (features[current_feature]) {
2092
2093 xml_printf(&retval, &tdesc, &pos, &size,
2094 "<feature name=\"%s\">\n",
2095 features[current_feature]);
2096
2097 int i;
2098 for (i = 0; i < reg_list_size; i++) {
2099
2100 if (reg_list[i]->exist == false)
2101 continue;
2102
2103 if (strcmp(reg_list[i]->feature->name, features[current_feature]))
2104 continue;
2105
2106 const char *type_str;
2107 if (reg_list[i]->reg_data_type != NULL) {
2108 if (reg_list[i]->reg_data_type->type == REG_TYPE_ARCH_DEFINED) {
2109 /* generate <type... first, if there are architecture-defined types. */
2110 gdb_generate_reg_type_description(target, &tdesc, &pos, &size,
2111 reg_list[i]->reg_data_type);
2112
2113 type_str = reg_list[i]->reg_data_type->id;
2114 } else {
2115 /* predefined type */
2116 type_str = gdb_get_reg_type_name(
2117 reg_list[i]->reg_data_type->type);
2118 }
2119 } else {
2120 /* Default type is "int" */
2121 type_str = "int";
2122 }
2123
2124 xml_printf(&retval, &tdesc, &pos, &size,
2125 "<reg name=\"%s\"", reg_list[i]->name);
2126 xml_printf(&retval, &tdesc, &pos, &size,
2127 " bitsize=\"%d\"", reg_list[i]->size);
2128 xml_printf(&retval, &tdesc, &pos, &size,
2129 " regnum=\"%d\"", reg_list[i]->number);
2130 if (reg_list[i]->caller_save)
2131 xml_printf(&retval, &tdesc, &pos, &size,
2132 " save-restore=\"yes\"");
2133 else
2134 xml_printf(&retval, &tdesc, &pos, &size,
2135 " save-restore=\"no\"");
2136
2137 xml_printf(&retval, &tdesc, &pos, &size,
2138 " type=\"%s\"", type_str);
2139
2140 if (reg_list[i]->group != NULL)
2141 xml_printf(&retval, &tdesc, &pos, &size,
2142 " group=\"%s\"", reg_list[i]->group);
2143
2144 xml_printf(&retval, &tdesc, &pos, &size,
2145 "/>\n");
2146 }
2147
2148 xml_printf(&retval, &tdesc, &pos, &size,
2149 "</feature>\n");
2150
2151 current_feature++;
2152 }
2153 }
2154
2155 xml_printf(&retval, &tdesc, &pos, &size,
2156 "</target>\n");
2157
2158 free(reg_list);
2159 free(features);
2160
2161 if (retval == ERROR_OK)
2162 *tdesc_out = tdesc;
2163 else
2164 free(tdesc);
2165
2166 return retval;
2167 }
2168
2169 static int gdb_get_target_description_chunk(struct target *target, struct target_desc_format *target_desc,
2170 char **chunk, int32_t offset, uint32_t length)
2171 {
2172 if (target_desc == NULL) {
2173 LOG_ERROR("Unable to Generate Target Description");
2174 return ERROR_FAIL;
2175 }
2176
2177 char *tdesc = target_desc->tdesc;
2178 uint32_t tdesc_length = target_desc->tdesc_length;
2179
2180 if (tdesc == NULL) {
2181 int retval = gdb_generate_target_description(target, &tdesc);
2182 if (retval != ERROR_OK) {
2183 LOG_ERROR("Unable to Generate Target Description");
2184 return ERROR_FAIL;
2185 }
2186
2187 tdesc_length = strlen(tdesc);
2188 }
2189
2190 char transfer_type;
2191
2192 if (length < (tdesc_length - offset))
2193 transfer_type = 'm';
2194 else
2195 transfer_type = 'l';
2196
2197 *chunk = malloc(length + 2);
2198 if (*chunk == NULL) {
2199 LOG_ERROR("Unable to allocate memory");
2200 return ERROR_FAIL;
2201 }
2202
2203 (*chunk)[0] = transfer_type;
2204 if (transfer_type == 'm') {
2205 strncpy((*chunk) + 1, tdesc + offset, length);
2206 (*chunk)[1 + length] = '\0';
2207 } else {
2208 strncpy((*chunk) + 1, tdesc + offset, tdesc_length - offset);
2209 (*chunk)[1 + (tdesc_length - offset)] = '\0';
2210
2211 /* After gdb-server sends out last chunk, invalidate tdesc. */
2212 free(tdesc);
2213 tdesc = NULL;
2214 tdesc_length = 0;
2215 }
2216
2217 target_desc->tdesc = tdesc;
2218 target_desc->tdesc_length = tdesc_length;
2219
2220 return ERROR_OK;
2221 }
2222
2223 static int gdb_target_description_supported(struct target *target, int *supported)
2224 {
2225 int retval = ERROR_OK;
2226 struct reg **reg_list = NULL;
2227 int reg_list_size = 0;
2228 int feature_list_size = 0;
2229 char **features = NULL;
2230
2231 retval = target_get_gdb_reg_list(target, &reg_list,
2232 &reg_list_size, REG_CLASS_ALL);
2233 if (retval != ERROR_OK) {
2234 LOG_ERROR("get register list failed");
2235 goto error;
2236 }
2237
2238 if (reg_list_size <= 0) {
2239 retval = ERROR_FAIL;
2240 goto error;
2241 }
2242
2243 /* Get a list of available target registers features */
2244 retval = get_reg_features_list(target, &features, &feature_list_size, reg_list, reg_list_size);
2245 if (retval != ERROR_OK) {
2246 LOG_ERROR("Can't get the registers feature list");
2247 goto error;
2248 }
2249
2250 if (supported) {
2251 if (feature_list_size)
2252 *supported = 1;
2253 else
2254 *supported = 0;
2255 }
2256
2257 error:
2258 if (reg_list != NULL)
2259 free(reg_list);
2260
2261 if (features != NULL)
2262 free(features);
2263
2264 return retval;
2265 }
2266
2267 static int gdb_query_packet(struct connection *connection,
2268 char *packet, int packet_size)
2269 {
2270 struct command_context *cmd_ctx = connection->cmd_ctx;
2271 struct gdb_connection *gdb_connection = connection->priv;
2272 struct target *target = get_target_from_connection(connection);
2273
2274 if (strncmp(packet, "qRcmd,", 6) == 0) {
2275 if (packet_size > 6) {
2276 char *cmd;
2277 cmd = malloc((packet_size - 6) / 2 + 1);
2278 int len = unhexify(cmd, packet + 6, (packet_size - 6) / 2);
2279 cmd[len] = 0;
2280
2281 /* We want to print all debug output to GDB connection */
2282 log_add_callback(gdb_log_callback, connection);
2283 target_call_timer_callbacks_now();
2284 /* some commands need to know the GDB connection, make note of current
2285 * GDB connection. */
2286 current_gdb_connection = gdb_connection;
2287 command_run_line(cmd_ctx, cmd);
2288 current_gdb_connection = NULL;
2289 target_call_timer_callbacks_now();
2290 log_remove_callback(gdb_log_callback, connection);
2291 free(cmd);
2292 }
2293 gdb_put_packet(connection, "OK", 2);
2294 return ERROR_OK;
2295 } else if (strncmp(packet, "qCRC:", 5) == 0) {
2296 if (packet_size > 5) {
2297 int retval;
2298 char gdb_reply[10];
2299 char *separator;
2300 uint32_t checksum;
2301 uint32_t addr = 0;
2302 uint32_t len = 0;
2303
2304 /* skip command character */
2305 packet += 5;
2306
2307 addr = strtoul(packet, &separator, 16);
2308
2309 if (*separator != ',') {
2310 LOG_ERROR("incomplete read memory packet received, dropping connection");
2311 return ERROR_SERVER_REMOTE_CLOSED;
2312 }
2313
2314 len = strtoul(separator + 1, NULL, 16);
2315
2316 retval = target_checksum_memory(target, addr, len, &checksum);
2317
2318 if (retval == ERROR_OK) {
2319 snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
2320 gdb_put_packet(connection, gdb_reply, 9);
2321 } else {
2322 retval = gdb_error(connection, retval);
2323 if (retval != ERROR_OK)
2324 return retval;
2325 }
2326
2327 return ERROR_OK;
2328 }
2329 } else if (strncmp(packet, "qSupported", 10) == 0) {
2330 /* we currently support packet size and qXfer:memory-map:read (if enabled)
2331 * qXfer:features:read is supported for some targets */
2332 int retval = ERROR_OK;
2333 char *buffer = NULL;
2334 int pos = 0;
2335 int size = 0;
2336 int gdb_target_desc_supported = 0;
2337
2338 /* we need to test that the target supports target descriptions */
2339 retval = gdb_target_description_supported(target, &gdb_target_desc_supported);
2340 if (retval != ERROR_OK) {
2341 LOG_INFO("Failed detecting Target Description Support, disabling");
2342 gdb_target_desc_supported = 0;
2343 }
2344
2345 /* support may be disabled globally */
2346 if (gdb_use_target_description == 0) {
2347 if (gdb_target_desc_supported)
2348 LOG_WARNING("Target Descriptions Supported, but disabled");
2349 gdb_target_desc_supported = 0;
2350 }
2351
2352 xml_printf(&retval,
2353 &buffer,
2354 &pos,
2355 &size,
2356 "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read%c;QStartNoAckMode+",
2357 (GDB_BUFFER_SIZE - 1),
2358 ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-',
2359 (gdb_target_desc_supported == 1) ? '+' : '-');
2360
2361 if (retval != ERROR_OK) {
2362 gdb_send_error(connection, 01);
2363 return ERROR_OK;
2364 }
2365
2366 gdb_put_packet(connection, buffer, strlen(buffer));
2367 free(buffer);
2368
2369 return ERROR_OK;
2370 } else if ((strncmp(packet, "qXfer:memory-map:read::", 23) == 0)
2371 && (flash_get_bank_count() > 0))
2372 return gdb_memory_map(connection, packet, packet_size);
2373 else if (strncmp(packet, "qXfer:features:read:", 20) == 0) {
2374 char *xml = NULL;
2375 int retval = ERROR_OK;
2376
2377 int offset;
2378 unsigned int length;
2379 char *annex = NULL;
2380
2381 /* skip command character */
2382 packet += 20;
2383
2384 if (decode_xfer_read(packet, &annex, &offset, &length) < 0) {
2385 gdb_send_error(connection, 01);
2386 return ERROR_OK;
2387 }
2388 free(annex);
2389
2390 /* Target should prepare correct target description for annex.
2391 * The first character of returned xml is 'm' or 'l'. 'm' for
2392 * there are *more* chunks to transfer. 'l' for it is the *last*
2393 * chunk of target description.
2394 */
2395 retval = gdb_get_target_description_chunk(target, &gdb_connection->target_desc,
2396 &xml, offset, length);
2397 if (retval != ERROR_OK) {
2398 gdb_error(connection, retval);
2399 return retval;
2400 }
2401
2402 gdb_put_packet(connection, xml, strlen(xml));
2403
2404 free(xml);
2405 return ERROR_OK;
2406 } else if (strncmp(packet, "QStartNoAckMode", 15) == 0) {
2407 gdb_connection->noack_mode = 1;
2408 gdb_put_packet(connection, "OK", 2);
2409 return ERROR_OK;
2410 }
2411
2412 gdb_put_packet(connection, "", 0);
2413 return ERROR_OK;
2414 }
2415
2416 static int gdb_v_packet(struct connection *connection,
2417 char *packet, int packet_size)
2418 {
2419 struct gdb_connection *gdb_connection = connection->priv;
2420 struct gdb_service *gdb_service = connection->service->priv;
2421 int result;
2422
2423 /* if flash programming disabled - send a empty reply */
2424
2425 if (gdb_flash_program == 0) {
2426 gdb_put_packet(connection, "", 0);
2427 return ERROR_OK;
2428 }
2429
2430 if (strncmp(packet, "vFlashErase:", 12) == 0) {
2431 unsigned long addr;
2432 unsigned long length;
2433
2434 char *parse = packet + 12;
2435 if (*parse == '\0') {
2436 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2437 return ERROR_SERVER_REMOTE_CLOSED;
2438 }
2439
2440 addr = strtoul(parse, &parse, 16);
2441
2442 if (*(parse++) != ',' || *parse == '\0') {
2443 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2444 return ERROR_SERVER_REMOTE_CLOSED;
2445 }
2446
2447 length = strtoul(parse, &parse, 16);
2448
2449 if (*parse != '\0') {
2450 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2451 return ERROR_SERVER_REMOTE_CLOSED;
2452 }
2453
2454 /* assume all sectors need erasing - stops any problems
2455 * when flash_write is called multiple times */
2456 flash_set_dirty();
2457
2458 /* perform any target specific operations before the erase */
2459 target_call_event_callbacks(gdb_service->target,
2460 TARGET_EVENT_GDB_FLASH_ERASE_START);
2461
2462 /* vFlashErase:addr,length messages require region start and
2463 * end to be "block" aligned ... if padding is ever needed,
2464 * GDB will have become dangerously confused.
2465 */
2466 result = flash_erase_address_range(gdb_service->target,
2467 false, addr, length);
2468
2469 /* perform any target specific operations after the erase */
2470 target_call_event_callbacks(gdb_service->target,
2471 TARGET_EVENT_GDB_FLASH_ERASE_END);
2472
2473 /* perform erase */
2474 if (result != ERROR_OK) {
2475 /* GDB doesn't evaluate the actual error number returned,
2476 * treat a failed erase as an I/O error
2477 */
2478 gdb_send_error(connection, EIO);
2479 LOG_ERROR("flash_erase returned %i", result);
2480 } else
2481 gdb_put_packet(connection, "OK", 2);
2482
2483 return ERROR_OK;
2484 }
2485
2486 if (strncmp(packet, "vFlashWrite:", 12) == 0) {
2487 int retval;
2488 unsigned long addr;
2489 unsigned long length;
2490 char *parse = packet + 12;
2491
2492 if (*parse == '\0') {
2493 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2494 return ERROR_SERVER_REMOTE_CLOSED;
2495 }
2496 addr = strtoul(parse, &parse, 16);
2497 if (*(parse++) != ':') {
2498 LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
2499 return ERROR_SERVER_REMOTE_CLOSED;
2500 }
2501 length = packet_size - (parse - packet);
2502
2503 /* create a new image if there isn't already one */
2504 if (gdb_connection->vflash_image == NULL) {
2505 gdb_connection->vflash_image = malloc(sizeof(struct image));
2506 image_open(gdb_connection->vflash_image, "", "build");
2507 }
2508
2509 /* create new section with content from packet buffer */
2510 retval = image_add_section(gdb_connection->vflash_image,
2511 addr, length, 0x0, (uint8_t *)parse);
2512 if (retval != ERROR_OK)
2513 return retval;
2514
2515 gdb_put_packet(connection, "OK", 2);
2516
2517 return ERROR_OK;
2518 }
2519
2520 if (strncmp(packet, "vFlashDone", 10) == 0) {
2521 uint32_t written;
2522
2523 /* process the flashing buffer. No need to erase as GDB
2524 * always issues a vFlashErase first. */
2525 target_call_event_callbacks(gdb_service->target,
2526 TARGET_EVENT_GDB_FLASH_WRITE_START);
2527 result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
2528 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
2529 if (result != ERROR_OK) {
2530 if (result == ERROR_FLASH_DST_OUT_OF_BANK)
2531 gdb_put_packet(connection, "E.memtype", 9);
2532 else
2533 gdb_send_error(connection, EIO);
2534 } else {
2535 LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
2536 gdb_put_packet(connection, "OK", 2);
2537 }
2538
2539 image_close(gdb_connection->vflash_image);
2540 free(gdb_connection->vflash_image);
2541 gdb_connection->vflash_image = NULL;
2542
2543 return ERROR_OK;
2544 }
2545
2546 gdb_put_packet(connection, "", 0);
2547 return ERROR_OK;
2548 }
2549
2550 static int gdb_detach(struct connection *connection)
2551 {
2552 struct gdb_service *gdb_service = connection->service->priv;
2553
2554 target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
2555
2556 return gdb_put_packet(connection, "OK", 2);
2557 }
2558
2559 /* The format of 'F' response packet is
2560 * Fretcode,errno,Ctrl-C flag;call-specific attachment
2561 */
2562 static int gdb_fileio_response_packet(struct connection *connection,
2563 char *packet, int packet_size)
2564 {
2565 struct target *target = get_target_from_connection(connection);
2566 char *separator;
2567 char *parsing_point;
2568 int fileio_retcode = strtoul(packet + 1, &separator, 16);
2569 int fileio_errno = 0;
2570 bool fileio_ctrl_c = false;
2571 int retval;
2572
2573 LOG_DEBUG("-");
2574
2575 if (*separator == ',') {
2576 parsing_point = separator + 1;
2577 fileio_errno = strtoul(parsing_point, &separator, 16);
2578 if (*separator == ',') {
2579 if (*(separator + 1) == 'C') {
2580 /* TODO: process ctrl-c */
2581 fileio_ctrl_c = true;
2582 }
2583 }
2584 }
2585
2586 LOG_DEBUG("File-I/O response, retcode: 0x%x, errno: 0x%x, ctrl-c: %s",
2587 fileio_retcode, fileio_errno, fileio_ctrl_c ? "true" : "false");
2588
2589 retval = target_gdb_fileio_end(target, fileio_retcode, fileio_errno, fileio_ctrl_c);
2590 if (retval != ERROR_OK)
2591 return ERROR_FAIL;
2592
2593 /* After File-I/O ends, keep continue or step */
2594 if (gdb_running_type == 'c')
2595 retval = target_resume(target, 1, 0x0, 0, 0);
2596 else if (gdb_running_type == 's')
2597 retval = target_step(target, 1, 0x0, 0);
2598 else
2599 retval = ERROR_FAIL;
2600
2601 if (retval != ERROR_OK)
2602 return ERROR_FAIL;
2603
2604 return ERROR_OK;
2605 }
2606
2607 static void gdb_log_callback(void *priv, const char *file, unsigned line,
2608 const char *function, const char *string)
2609 {
2610 struct connection *connection = priv;
2611 struct gdb_connection *gdb_con = connection->priv;
2612
2613 if (gdb_con->busy) {
2614 /* do not reply this using the O packet */
2615 return;
2616 }
2617
2618 gdb_output_con(connection, string);
2619 }
2620
2621 static void gdb_sig_halted(struct connection *connection)
2622 {
2623 char sig_reply[4];
2624 snprintf(sig_reply, 4, "T%2.2x", 2);
2625 gdb_put_packet(connection, sig_reply, 3);
2626 }
2627
2628 static int gdb_input_inner(struct connection *connection)
2629 {
2630 /* Do not allocate this on the stack */
2631 static char gdb_packet_buffer[GDB_BUFFER_SIZE];
2632
2633 struct gdb_service *gdb_service = connection->service->priv;
2634 struct target *target = gdb_service->target;
2635 char *packet = gdb_packet_buffer;
2636 int packet_size;
2637 int retval;
2638 struct gdb_connection *gdb_con = connection->priv;
2639 static int extended_protocol;
2640
2641 /* drain input buffer. If one of the packets fail, then an error
2642 * packet is replied, if applicable.
2643 *
2644 * This loop will terminate and the error code is returned.
2645 *
2646 * The calling fn will check if this error is something that
2647 * can be recovered from, or if the connection must be closed.
2648 *
2649 * If the error is recoverable, this fn is called again to
2650 * drain the rest of the buffer.
2651 */
2652 do {
2653 packet_size = GDB_BUFFER_SIZE-1;
2654 retval = gdb_get_packet(connection, packet, &packet_size);
2655 if (retval != ERROR_OK)
2656 return retval;
2657
2658 /* terminate with zero */
2659 packet[packet_size] = 0;
2660
2661 if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
2662 if (packet[0] == 'X') {
2663 /* binary packets spew junk into the debug log stream */
2664 char buf[50];
2665 int x;
2666 for (x = 0; (x < 49) && (packet[x] != ':'); x++)
2667 buf[x] = packet[x];
2668 buf[x] = 0;
2669 LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
2670 } else
2671 LOG_DEBUG("received packet: '%s'", packet);
2672 }
2673
2674 if (packet_size > 0) {
2675 retval = ERROR_OK;
2676 switch (packet[0]) {
2677 case 'T': /* Is thread alive? */
2678 gdb_thread_packet(connection, packet, packet_size);
2679 break;
2680 case 'H': /* Set current thread ( 'c' for step and continue,
2681 * 'g' for all other operations ) */
2682 gdb_thread_packet(connection, packet, packet_size);
2683 break;
2684 case 'q':
2685 case 'Q':
2686 retval = gdb_thread_packet(connection, packet, packet_size);
2687 if (retval == GDB_THREAD_PACKET_NOT_CONSUMED)
2688 retval = gdb_query_packet(connection, packet, packet_size);
2689 break;
2690 case 'g':
2691 retval = gdb_get_registers_packet(connection, packet, packet_size);
2692 break;
2693 case 'G':
2694 retval = gdb_set_registers_packet(connection, packet, packet_size);
2695 break;
2696 case 'p':
2697 retval = gdb_get_register_packet(connection, packet, packet_size);
2698 break;
2699 case 'P':
2700 retval = gdb_set_register_packet(connection, packet, packet_size);
2701 break;
2702 case 'm':
2703 retval = gdb_read_memory_packet(connection, packet, packet_size);
2704 break;
2705 case 'M':
2706 retval = gdb_write_memory_packet(connection, packet, packet_size);
2707 break;
2708 case 'z':
2709 case 'Z':
2710 retval = gdb_breakpoint_watchpoint_packet(connection, packet, packet_size);
2711 break;
2712 case '?':
2713 gdb_last_signal_packet(connection, packet, packet_size);
2714 break;
2715 case 'c':
2716 case 's':
2717 {
2718 gdb_thread_packet(connection, packet, packet_size);
2719 log_add_callback(gdb_log_callback, connection);
2720
2721 if (gdb_con->mem_write_error) {
2722 LOG_ERROR("Memory write failure!");
2723
2724 /* now that we have reported the memory write error,
2725 * we can clear the condition */
2726 gdb_con->mem_write_error = false;
2727 }
2728
2729 bool nostep = false;
2730 bool already_running = false;
2731 if (target->state == TARGET_RUNNING) {
2732 LOG_WARNING("WARNING! The target is already running. "
2733 "All changes GDB did to registers will be discarded! "
2734 "Waiting for target to halt.");
2735 already_running = true;
2736 } else if (target->state != TARGET_HALTED) {
2737 LOG_WARNING("The target is not in the halted nor running stated, " \
2738 "stepi/continue ignored.");
2739 nostep = true;
2740 } else if ((packet[0] == 's') && gdb_con->sync) {
2741 /* Hmm..... when you issue a continue in GDB, then a "stepi" is
2742 * sent by GDB first to OpenOCD, thus defeating the check to
2743 * make only the single stepping have the sync feature...
2744 */
2745 nostep = true;
2746 LOG_WARNING("stepi ignored. GDB will now fetch the register state " \
2747 "from the target.");
2748 }
2749 gdb_con->sync = false;
2750
2751 if (!already_running && nostep) {
2752 /* Either the target isn't in the halted state, then we can't
2753 * step/continue. This might be early setup, etc.
2754 *
2755 * Or we want to allow GDB to pick up a fresh set of
2756 * register values without modifying the target state.
2757 *
2758 */
2759 gdb_sig_halted(connection);
2760
2761 /* stop forwarding log packets! */
2762 log_remove_callback(gdb_log_callback, connection);
2763 } else {
2764 /* We're running/stepping, in which case we can
2765 * forward log output until the target is halted
2766 */
2767 gdb_con->frontend_state = TARGET_RUNNING;
2768 target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
2769
2770 if (!already_running) {
2771 /* Here we don't want packet processing to stop even if this fails,
2772 * so we use a local variable instead of retval. */
2773 retval = gdb_step_continue_packet(connection, packet, packet_size);
2774 if (retval != ERROR_OK) {
2775 /* we'll never receive a halted
2776 * condition... issue a false one..
2777 */
2778 gdb_frontend_halted(target, connection);
2779 }
2780 }
2781 }
2782 }
2783 break;
2784 case 'v':
2785 retval = gdb_v_packet(connection, packet, packet_size);
2786 break;
2787 case 'D':
2788 retval = gdb_detach(connection);
2789 extended_protocol = 0;
2790 break;
2791 case 'X':
2792 retval = gdb_write_memory_binary_packet(connection, packet, packet_size);
2793 if (retval != ERROR_OK)
2794 return retval;
2795 break;
2796 case 'k':
2797 if (extended_protocol != 0) {
2798 gdb_con->attached = false;
2799 break;
2800 }
2801 gdb_put_packet(connection, "OK", 2);
2802 return ERROR_SERVER_REMOTE_CLOSED;
2803 case '!':
2804 /* handle extended remote protocol */
2805 extended_protocol = 1;
2806 gdb_put_packet(connection, "OK", 2);
2807 break;
2808 case 'R':
2809 /* handle extended restart packet */
2810 breakpoint_clear_target(gdb_service->target);
2811 watchpoint_clear_target(gdb_service->target);
2812 command_run_linef(connection->cmd_ctx, "ocd_gdb_restart %s",
2813 target_name(target));
2814 /* set connection as attached after reset */
2815 gdb_con->attached = true;
2816 /* info rtos parts */
2817 gdb_thread_packet(connection, packet, packet_size);
2818 break;
2819
2820 case 'j':
2821 /* packet supported only by smp target i.e cortex_a.c*/
2822 /* handle smp packet replying coreid played to gbd */
2823 gdb_read_smp_packet(connection, packet, packet_size);
2824 break;
2825
2826 case 'J':
2827 /* packet supported only by smp target i.e cortex_a.c */
2828 /* handle smp packet setting coreid to be played at next
2829 * resume to gdb */
2830 gdb_write_smp_packet(connection, packet, packet_size);
2831 break;
2832
2833 case 'F':
2834 /* File-I/O extension */
2835 /* After gdb uses host-side syscall to complete target file
2836 * I/O, gdb sends host-side syscall return value to target
2837 * by 'F' packet.
2838 * The format of 'F' response packet is
2839 * Fretcode,errno,Ctrl-C flag;call-specific attachment
2840 */
2841 gdb_con->frontend_state = TARGET_RUNNING;
2842 log_add_callback(gdb_log_callback, connection);
2843 gdb_fileio_response_packet(connection, packet, packet_size);
2844 break;
2845
2846 default:
2847 /* ignore unknown packets */
2848 LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
2849 gdb_put_packet(connection, NULL, 0);
2850 break;
2851 }
2852
2853 /* if a packet handler returned an error, exit input loop */
2854 if (retval != ERROR_OK)
2855 return retval;
2856 }
2857
2858 if (gdb_con->ctrl_c) {
2859 if (target->state == TARGET_RUNNING) {
2860 retval = target_halt(target);
2861 if (retval != ERROR_OK)
2862 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2863 gdb_con->ctrl_c = 0;
2864 } else {
2865 LOG_INFO("The target is not running when halt was requested, stopping GDB.");
2866 target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
2867 }
2868 }
2869
2870 } while (gdb_con->buf_cnt > 0);
2871
2872 return ERROR_OK;
2873 }
2874
2875 static int gdb_input(struct connection *connection)
2876 {
2877 int retval = gdb_input_inner(connection);
2878 struct gdb_connection *gdb_con = connection->priv;
2879 if (retval == ERROR_SERVER_REMOTE_CLOSED)
2880 return retval;
2881
2882 /* logging does not propagate the error, yet can set the gdb_con->closed flag */
2883 if (gdb_con->closed)
2884 return ERROR_SERVER_REMOTE_CLOSED;
2885
2886 /* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
2887 return ERROR_OK;
2888 }
2889
2890 static int gdb_target_start(struct target *target, const char *port)
2891 {
2892 struct gdb_service *gdb_service;
2893 int ret;
2894 gdb_service = malloc(sizeof(struct gdb_service));
2895
2896 if (NULL == gdb_service)
2897 return -ENOMEM;
2898
2899 gdb_service->target = target;
2900 gdb_service->core[0] = -1;
2901 gdb_service->core[1] = -1;
2902 target->gdb_service = gdb_service;
2903
2904 ret = add_service("gdb",
2905 port, 1, &gdb_new_connection, &gdb_input,
2906 &gdb_connection_closed, gdb_service);
2907 /* initialialize all targets gdb service with the same pointer */
2908 {
2909 struct target_list *head;
2910 struct target *curr;
2911 head = target->head;
2912 while (head != (struct target_list *)NULL) {
2913 curr = head->target;
2914 if (curr != target)
2915 curr->gdb_service = gdb_service;
2916 head = head->next;
2917 }
2918 }
2919 return ret;
2920 }
2921
2922 static int gdb_target_add_one(struct target *target)
2923 {
2924 /* one gdb instance per smp list */
2925 if ((target->smp) && (target->gdb_service))
2926 return ERROR_OK;
2927 int retval = gdb_target_start(target, gdb_port_next);
2928 if (retval == ERROR_OK) {
2929 long portnumber;
2930 /* If we can parse the port number
2931 * then we increment the port number for the next target.
2932 */
2933 char *end;
2934 portnumber = strtol(gdb_port_next, &end, 0);
2935 if (!*end) {
2936 if (parse_long(gdb_port_next, &portnumber) == ERROR_OK) {
2937 free(gdb_port_next);
2938 gdb_port_next = alloc_printf("%d", portnumber+1);
2939 }
2940 }
2941 }
2942 return retval;
2943 }
2944
2945 int gdb_target_add_all(struct target *target)
2946 {
2947 if (NULL == target) {
2948 LOG_WARNING("gdb services need one or more targets defined");
2949 return ERROR_OK;
2950 }
2951
2952 while (NULL != target) {
2953 int retval = gdb_target_add_one(target);
2954 if (ERROR_OK != retval)
2955 return retval;
2956
2957 target = target->next;
2958 }
2959
2960 return ERROR_OK;
2961 }
2962
2963 COMMAND_HANDLER(handle_gdb_sync_command)
2964 {
2965 if (CMD_ARGC != 0)
2966 return ERROR_COMMAND_SYNTAX_ERROR;
2967
2968 if (current_gdb_connection == NULL) {
2969 command_print(CMD_CTX,
2970 "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
2971 return ERROR_FAIL;
2972 }
2973
2974 current_gdb_connection->sync = true;
2975
2976 return ERROR_OK;
2977 }
2978
2979 /* daemon configuration command gdb_port */
2980 COMMAND_HANDLER(handle_gdb_port_command)
2981 {
2982 int retval = CALL_COMMAND_HANDLER(server_pipe_command, &gdb_port);
2983 if (ERROR_OK == retval) {
2984 free(gdb_port_next);
2985 gdb_port_next = strdup(gdb_port);
2986 }
2987 return retval;
2988 }
2989
2990 COMMAND_HANDLER(handle_gdb_memory_map_command)
2991 {
2992 if (CMD_ARGC != 1)
2993 return ERROR_COMMAND_SYNTAX_ERROR;
2994
2995 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map);
2996 return ERROR_OK;
2997 }
2998
2999 COMMAND_HANDLER(handle_gdb_flash_program_command)
3000 {
3001 if (CMD_ARGC != 1)
3002 return ERROR_COMMAND_SYNTAX_ERROR;
3003
3004 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program);
3005 return ERROR_OK;
3006 }
3007
3008 COMMAND_HANDLER(handle_gdb_report_data_abort_command)
3009 {
3010 if (CMD_ARGC != 1)
3011 return ERROR_COMMAND_SYNTAX_ERROR;
3012
3013 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort);
3014 return ERROR_OK;
3015 }
3016
3017 /* gdb_breakpoint_override */
3018 COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
3019 {
3020 if (CMD_ARGC == 0) {
3021 /* nothing */
3022 } else if (CMD_ARGC == 1) {
3023 gdb_breakpoint_override = 1;
3024 if (strcmp(CMD_ARGV[0], "hard") == 0)
3025 gdb_breakpoint_override_type = BKPT_HARD;
3026 else if (strcmp(CMD_ARGV[0], "soft") == 0)
3027 gdb_breakpoint_override_type = BKPT_SOFT;
3028 else if (strcmp(CMD_ARGV[0], "disable") == 0)
3029 gdb_breakpoint_override = 0;
3030 } else
3031 return ERROR_COMMAND_SYNTAX_ERROR;
3032 if (gdb_breakpoint_override)
3033 LOG_USER("force %s breakpoints",
3034 (gdb_breakpoint_override_type == BKPT_HARD) ? "hard" : "soft");
3035 else
3036 LOG_USER("breakpoint type is not overridden");
3037
3038 return ERROR_OK;
3039 }
3040
3041 COMMAND_HANDLER(handle_gdb_target_description_command)
3042 {
3043 if (CMD_ARGC != 1)
3044 return ERROR_COMMAND_SYNTAX_ERROR;
3045
3046 COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_target_description);
3047 return ERROR_OK;
3048 }
3049
3050 COMMAND_HANDLER(handle_gdb_save_tdesc_command)
3051 {
3052 char *tdesc;
3053 uint32_t tdesc_length;
3054 struct target *target = get_current_target(CMD_CTX);
3055
3056 int retval = gdb_generate_target_description(target, &tdesc);
3057 if (retval != ERROR_OK) {
3058 LOG_ERROR("Unable to Generate Target Description");
3059 return ERROR_FAIL;
3060 }
3061
3062 tdesc_length = strlen(tdesc);
3063
3064 struct fileio fileio;
3065 size_t size_written;
3066
3067 char *tdesc_filename = alloc_printf("%s.xml", target_type_name(target));
3068 if (tdesc_filename == NULL) {
3069 retval = ERROR_FAIL;
3070 goto out;
3071 }
3072
3073 retval = fileio_open(&fileio, tdesc_filename, FILEIO_WRITE, FILEIO_TEXT);
3074
3075 if (retval != ERROR_OK) {
3076 LOG_ERROR("Can't open %s for writing", tdesc_filename);
3077 goto out;
3078 }
3079
3080 retval = fileio_write(&fileio, tdesc_length, tdesc, &size_written);
3081
3082 fileio_close(&fileio);
3083
3084 if (retval != ERROR_OK)
3085 LOG_ERROR("Error while writing the tdesc file");
3086
3087 out:
3088 free(tdesc_filename);
3089 free(tdesc);
3090
3091 return retval;
3092 }
3093
3094 static const struct command_registration gdb_command_handlers[] = {
3095 {
3096 .name = "gdb_sync",
3097 .handler = handle_gdb_sync_command,
3098 .mode = COMMAND_ANY,
3099 .help = "next stepi will return immediately allowing "
3100 "GDB to fetch register state without affecting "
3101 "target state",
3102 .usage = ""
3103 },
3104 {
3105 .name = "gdb_port",
3106 .handler = handle_gdb_port_command,
3107 .mode = COMMAND_ANY,
3108 .help = "Normally gdb listens to a TCP/IP port. Each subsequent GDB "
3109 "server listens for the next port number after the "
3110 "base port number specified. "
3111 "No arguments reports GDB port. \"pipe\" means listen to stdin "
3112 "output to stdout, an integer is base port number, \"disable\" disables "
3113 "port. Any other string is are interpreted as named pipe to listen to. "
3114 "Output pipe is the same name as input pipe, but with 'o' appended.",
3115 .usage = "[port_num]",
3116 },
3117 {
3118 .name = "gdb_memory_map",
3119 .handler = handle_gdb_memory_map_command,
3120 .mode = COMMAND_CONFIG,
3121 .help = "enable or disable memory map",
3122 .usage = "('enable'|'disable')"
3123 },
3124 {
3125 .name = "gdb_flash_program",
3126 .handler = handle_gdb_flash_program_command,
3127 .mode = COMMAND_CONFIG,
3128 .help = "enable or disable flash program",
3129 .usage = "('enable'|'disable')"
3130 },
3131 {
3132 .name = "gdb_report_data_abort",
3133 .handler = handle_gdb_report_data_abort_command,
3134 .mode = COMMAND_CONFIG,
3135 .help = "enable or disable reporting data aborts",
3136 .usage = "('enable'|'disable')"
3137 },
3138 {
3139 .name = "gdb_breakpoint_override",
3140 .handler = handle_gdb_breakpoint_override_command,
3141 .mode = COMMAND_ANY,
3142 .help = "Display or specify type of breakpoint "
3143 "to be used by gdb 'break' commands.",
3144 .usage = "('hard'|'soft'|'disable')"
3145 },
3146 {
3147 .name = "gdb_target_description",
3148 .handler = handle_gdb_target_description_command,
3149 .mode = COMMAND_CONFIG,
3150 .help = "enable or disable target description",
3151 .usage = "('enable'|'disable')"
3152 },
3153 {
3154 .name = "gdb_save_tdesc",
3155 .handler = handle_gdb_save_tdesc_command,
3156 .mode = COMMAND_EXEC,
3157 .help = "Save the target description file",
3158 },
3159 COMMAND_REGISTRATION_DONE
3160 };
3161
3162 int gdb_register_commands(struct command_context *cmd_ctx)
3163 {
3164 gdb_port = strdup("3333");
3165 gdb_port_next = strdup("3333");
3166 return register_commands(cmd_ctx, NULL, gdb_command_handlers);
3167 }
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