gdb_server.c 57 KB
Newer Older
1
2
3
4
/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
5
 *   Copyright (C) 2007,2008 yvind Harboe                                 *
6
7
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
8
9
10
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "replacements.h"

#include "gdb_server.h"

#include "server.h"
#include "log.h"
#include "binarybuffer.h"
#include "jtag.h"
#include "breakpoints.h"
#include "flash.h"
ntfreak's avatar
ntfreak committed
40
#include "target.h"
41
42
43
44
45
46
47
48
49
50
51
52
#include "target_request.h"
#include "configuration.h"

#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>

#if 0
#define _DEBUG_GDB_IO_
#endif

53
54
55
static int gdb_breakpoint_override;
static enum breakpoint_type gdb_breakpoint_override_type;

56
extern int gdb_error(connection_t *connection, int retval);
57
58
59
static unsigned short gdb_port;
static const char *DIGITS = "0123456789abcdef";

ntfreak's avatar
ntfreak committed
60
static void gdb_log_callback(void *priv, const char *file, int line,
61
		const char *function, const char *string);
62
63
64
65
66
67
68
69
70
71
72
73
74
75

enum gdb_detach_mode
{
	GDB_DETACH_RESUME,
	GDB_DETACH_RESET,
	GDB_DETACH_HALT,
	GDB_DETACH_NOTHING
};

/* target behaviour on gdb detach */
enum gdb_detach_mode detach_mode = GDB_DETACH_RESUME;

/* set if we are sending a memory map to gdb
 * via qXfer:memory-map:read packet */
76
77
78
79
/* enabled by default*/
int gdb_use_memory_map = 1;
/* enabled by default*/
int gdb_flash_program = 1;
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99

/* if set, data aborts cause an error to be reported in memory read packets
 * see the code in gdb_read_memory_packet() for further explanations */
int gdb_report_data_abort = 0;

int gdb_last_signal(target_t *target)
{
	switch (target->debug_reason)
	{
		case DBG_REASON_DBGRQ:
			return 0x2; /* SIGINT */
		case DBG_REASON_BREAKPOINT:
		case DBG_REASON_WATCHPOINT:
		case DBG_REASON_WPTANDBKPT:
			return 0x05; /* SIGTRAP */
		case DBG_REASON_SINGLESTEP:
			return 0x05; /* SIGTRAP */
		case DBG_REASON_NOTHALTED:
			return 0x0; /* no signal... shouldn't happen */
		default:
100
			LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason);
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
			return 0x0;
	}
}

int check_pending(connection_t *connection, int timeout_s, int *got_data)
{
	/* a non-blocking socket will block if there is 0 bytes available on the socket,
	 * but return with as many bytes as are available immediately
	 */
	struct timeval tv;
	fd_set read_fds;
	gdb_connection_t *gdb_con = connection->priv;
	int t;
	if (got_data==NULL)
		got_data=&t;
	*got_data=0;

	if (gdb_con->buf_cnt>0)
	{
		*got_data = 1;
		return ERROR_OK;
	}
123

124
125
	FD_ZERO(&read_fds);
	FD_SET(connection->fd, &read_fds);
126

127
128
	tv.tv_sec = timeout_s;
	tv.tv_usec = 0;
129
	if (socket_select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0)
130
131
132
133
134
135
136
137
138
139
140
	{
		/* This can typically be because a "monitor" command took too long
		 * before printing any progress messages
		 */
		if (timeout_s>0)
		{
			return ERROR_GDB_TIMEOUT;
		} else
		{
			return ERROR_OK;
		}
141
	}
142
143
	*got_data=FD_ISSET(connection->fd, &read_fds)!=0;
	return ERROR_OK;
144
145
146
147
148
}

int gdb_get_char(connection_t *connection, int* next_char)
{
	gdb_connection_t *gdb_con = connection->priv;
149
	int retval=ERROR_OK;
150
151
152
153
154
155
156
157
158
159
160
161
162
163

#ifdef _DEBUG_GDB_IO_
	char *debug_buffer;
#endif

	if (gdb_con->buf_cnt-- > 0)
	{
		*next_char = *(gdb_con->buf_p++);
		if (gdb_con->buf_cnt > 0)
			connection->input_pending = 1;
		else
			connection->input_pending = 0;

#ifdef _DEBUG_GDB_IO_
164
		LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
165
166
167
168
169
170
171
#endif

		return ERROR_OK;
	}

	for (;;)
	{
172
173
174
175
176
177
178
179
180
181
182
		if (connection->service->type == CONNECTION_PIPE)
		{
			gdb_con->buf_cnt = read(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
		}
		else
		{
			retval = check_pending(connection, 1, NULL);
			if (retval != ERROR_OK)
				return retval;
			gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
		}
183

184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
		if (gdb_con->buf_cnt > 0)
		{
			break;
		}
		if (gdb_con->buf_cnt == 0)
		{
			gdb_con->closed = 1;
			return ERROR_SERVER_REMOTE_CLOSED;
		}

#ifdef _WIN32
		errno = WSAGetLastError();

		switch(errno)
		{
			case WSAEWOULDBLOCK:
				usleep(1000);
				break;
			case WSAECONNABORTED:
203
				gdb_con->closed = 1;
204
205
				return ERROR_SERVER_REMOTE_CLOSED;
			case WSAECONNRESET:
206
				gdb_con->closed = 1;
207
208
				return ERROR_SERVER_REMOTE_CLOSED;
			default:
209
				LOG_ERROR("read: %d", errno);
210
211
212
213
214
215
216
217
218
				exit(-1);
		}
#else
		switch(errno)
		{
			case EAGAIN:
				usleep(1000);
				break;
			case ECONNABORTED:
219
				gdb_con->closed = 1;
220
221
				return ERROR_SERVER_REMOTE_CLOSED;
			case ECONNRESET:
222
				gdb_con->closed = 1;
223
224
				return ERROR_SERVER_REMOTE_CLOSED;
			default:
225
				LOG_ERROR("read: %s", strerror(errno));
226
				gdb_con->closed = 1;
227
228
229
230
231
232
233
234
235
				return ERROR_SERVER_REMOTE_CLOSED;
		}
#endif
	}

#ifdef _DEBUG_GDB_IO_
	debug_buffer = malloc(gdb_con->buf_cnt + 1);
	memcpy(debug_buffer, gdb_con->buffer, gdb_con->buf_cnt);
	debug_buffer[gdb_con->buf_cnt] = 0;
236
	LOG_DEBUG("received '%s'", debug_buffer);
237
238
239
240
241
242
243
244
245
	free(debug_buffer);
#endif

	gdb_con->buf_p = gdb_con->buffer;
	gdb_con->buf_cnt--;
	*next_char = *(gdb_con->buf_p++);
	if (gdb_con->buf_cnt > 0)
		connection->input_pending = 1;
	else
ntfreak's avatar
ntfreak committed
246
		connection->input_pending = 0;
247
#ifdef _DEBUG_GDB_IO_
248
	LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
249
250
#endif

251
	return retval;
252
253
254
255
256
257
258
259
260
261
262
263
264
}

int gdb_putback_char(connection_t *connection, int last_char)
{
	gdb_connection_t *gdb_con = connection->priv;

	if (gdb_con->buf_p > gdb_con->buffer)
	{
		*(--gdb_con->buf_p) = last_char;
		gdb_con->buf_cnt++;
	}
	else
	{
265
		LOG_ERROR("BUG: couldn't put character back");
266
267
268
269
270
271
272
273
274
275
276
277
278
	}

	return ERROR_OK;
}

/* The only way we can detect that the socket is closed is the first time
 * we write to it, we will fail. Subsequent write operations will
 * succeed. Shudder! */
int gdb_write(connection_t *connection, void *data, int len)
{
	gdb_connection_t *gdb_con = connection->priv;
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;
279

280
	if (connection->service->type == CONNECTION_PIPE)
281
	{
282
283
284
285
286
287
288
289
290
291
292
293
		/* write to stdout */
		if (write(STDOUT_FILENO, data, len) == len)
		{
			return ERROR_OK;
		}
	}
	else
	{
		if (write_socket(connection->fd, data, len) == len)
		{
			return ERROR_OK;
		}
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
	}
	gdb_con->closed = 1;
	return ERROR_SERVER_REMOTE_CLOSED;
}

int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
{
	int i;
	unsigned char my_checksum = 0;
#ifdef _DEBUG_GDB_IO_
	char *debug_buffer;
#endif
	int reply;
	int retval;
	gdb_connection_t *gdb_con = connection->priv;

	for (i = 0; i < len; i++)
		my_checksum += buffer[i];

313
#ifdef _DEBUG_GDB_IO_
314
	/*
315
316
317
318
319
320
321
322
323
324
325
326
327
	 * At this point we should have nothing in the input queue from GDB,
	 * however sometimes '-' is sent even though we've already received
	 * an ACK (+) for everything we've sent off.
	 */
	int gotdata;
	for (;;)
	{
		if ((retval=check_pending(connection, 0, &gotdata))!=ERROR_OK)
			return retval;
		if (!gotdata)
			break;
		if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
			return retval;
ntfreak's avatar
ntfreak committed
328
		if( reply == '$' ){
329
			/* fix a problem with some IAR tools */
330
331
332
333
334
			gdb_putback_char( connection, reply );
			LOG_DEBUG("Unexpected start of new packet");
			break;
		}

335
		LOG_WARNING("Discard unexpected char %c", reply);
336
337
338
	}
#endif

339
340
341
342
343
344
	while (1)
	{
#ifdef _DEBUG_GDB_IO_
		debug_buffer = malloc(len + 1);
		memcpy(debug_buffer, buffer, len);
		debug_buffer[len] = 0;
345
		LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
346
347
		free(debug_buffer);
#endif
ntfreak's avatar
ntfreak committed
348

349
350
351
		char local_buffer[1024];
		local_buffer[0] = '$';
		if (len+4 <= sizeof(local_buffer))
352
		{
353
354
355
356
357
			/* performance gain on smaller packets by only a single call to gdb_write() */
			memcpy(local_buffer+1, buffer, len++);
			local_buffer[len++] = '#';
			local_buffer[len++] = DIGITS[(my_checksum >> 4) & 0xf];
			local_buffer[len++] = DIGITS[my_checksum & 0xf];
358
359
360
361
			if((retval = gdb_write(connection, local_buffer, len)) != ERROR_OK)
			{
				return retval;
			}
362
		}
363
		else
364
		{
365
366
367
368
369
			/* larger packets are transmitted directly from caller supplied buffer
			   by several calls to gdb_write() to avoid dynamic allocation */
			local_buffer[1] = '#';
			local_buffer[2] = DIGITS[(my_checksum >> 4) & 0xf];
			local_buffer[3] = DIGITS[my_checksum & 0xf];
370
371
372
373
374
375
376
377
378
379
380
381
			if((retval = gdb_write(connection, local_buffer, 1)) != ERROR_OK)
			{
				return retval;
			}
			if((retval = gdb_write(connection, buffer, len)) != ERROR_OK)
			{
				return retval;
			}
			if((retval = gdb_write(connection, local_buffer+1, 3)) != ERROR_OK)
			{
				return retval;
			}
382
		}
383

384
385
		if (gdb_con->noack_mode)
			break;
386

387
388
389
390
391
392
393
394
395
		if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
			return retval;

		if (reply == '+')
			break;
		else if (reply == '-')
		{
			/* Stop sending output packets for now */
			log_remove_callback(gdb_log_callback, connection);
396
			LOG_WARNING("negative reply, retrying");
397
398
399
400
401
402
403
404
405
406
407
408
		}
		else if (reply == 0x3)
		{
			gdb_con->ctrl_c = 1;
			if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
				return retval;
			if (reply == '+')
				break;
			else if (reply == '-')
			{
				/* Stop sending output packets for now */
				log_remove_callback(gdb_log_callback, connection);
409
				LOG_WARNING("negative reply, retrying");
410
			}
411
412
413
414
415
			else if( reply == '$' ){
				LOG_ERROR("GDB missing ack(1) - assumed good");
				gdb_putback_char( connection, reply );
				return ERROR_OK;
			} else {
oharboe's avatar
oharboe committed
416

417
				LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
418
				gdb_con->closed=1;
419
420
				return ERROR_SERVER_REMOTE_CLOSED;
			}
oharboe's avatar
oharboe committed
421
		}
422
423
424
425
		else if( reply == '$' ){
			LOG_ERROR("GDB missing ack(2) - assumed good");
			gdb_putback_char( connection, reply );
			return ERROR_OK;
oharboe's avatar
oharboe committed
426
		}
427
428
		else
		{
429
			LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection", reply);
430
			gdb_con->closed=1;
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
			return ERROR_SERVER_REMOTE_CLOSED;
		}
	}
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;

	return ERROR_OK;
}

int gdb_put_packet(connection_t *connection, char *buffer, int len)
{
	gdb_connection_t *gdb_con = connection->priv;
	gdb_con->busy = 1;
	int retval = gdb_put_packet_inner(connection, buffer, len);
	gdb_con->busy = 0;
446
447
448
449

	/* we sent some data, reset timer for keep alive messages */
	kept_alive();

450
451
452
	return retval;
}

oharboe's avatar
oharboe committed
453
static __inline__ int fetch_packet(connection_t *connection, int *checksum_ok, int noack, int *len, char *buffer)
454
{
oharboe's avatar
oharboe committed
455
456
	unsigned char my_checksum = 0;
	char checksum[3];
457
	int character;
oharboe's avatar
oharboe committed
458
	int retval;
459

oharboe's avatar
oharboe committed
460
461
	gdb_connection_t *gdb_con = connection->priv;
	my_checksum = 0;
462
	int count = 0;
oharboe's avatar
oharboe committed
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
	count = 0;
	for (;;)
	{
		/* The common case is that we have an entire packet with no escape chars.
		 * We need to leave at least 2 bytes in the buffer to have
		 * gdb_get_char() update various bits and bobs correctly.
		 */
		if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt+count) < *len))
		{
			/* The compiler will struggle a bit with constant propagation and
			 * aliasing, so we help it by showing that these values do not
			 * change inside the loop
			 */
			int i;
			char *buf = gdb_con->buf_p;
			int run = gdb_con->buf_cnt - 2;
			i = 0;
			int done = 0;
			while (i < run)
			{
				character = *buf++;
				i++;
				if (character == '#')
				{
					/* Danger! character can be '#' when esc is
					 * used so we need an explicit boolean for done here.
					 */
					done = 1;
					break;
				}

				if (character == '}')
				{
					/* data transmitted in binary mode (X packet)
					 * uses 0x7d as escape character */
					my_checksum += character & 0xff;
					character = *buf++;
					i++;
					my_checksum += character & 0xff;
					buffer[count++] = (character ^ 0x20) & 0xff;
				}
				else
				{
					my_checksum += character & 0xff;
					buffer[count++] = character & 0xff;
				}
			}
			gdb_con->buf_p += i;
			gdb_con->buf_cnt -= i;
			if (done)
				break;
		}
		if (count > *len)
		{
			LOG_ERROR("packet buffer too small");
			return ERROR_GDB_BUFFER_TOO_SMALL;
		}

		if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
			return retval;

		if (character == '#')
			break;

		if (character == '}')
		{
			/* data transmitted in binary mode (X packet)
			 * uses 0x7d as escape character */
			my_checksum += character & 0xff;
			if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
				return retval;
			my_checksum += character & 0xff;
			buffer[count++] = (character ^ 0x20) & 0xff;
		}
		else
		{
			my_checksum += character & 0xff;
			buffer[count++] = character & 0xff;
		}
	}

	*len = count;

	if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
		return retval;
	checksum[0] = character;
	if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
		return retval;
	checksum[1] = character;
	checksum[2] = 0;
553

oharboe's avatar
oharboe committed
554
555
556
557
	if (!noack)
	{
		*checksum_ok=(my_checksum == strtoul(checksum, NULL, 16));
	}
558

oharboe's avatar
oharboe committed
559
560
561
562
563
564
	return ERROR_OK;
}

int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len)
{
	int character;
565
566
567
568
569
570
571
572
573
574
575
	int retval;
	gdb_connection_t *gdb_con = connection->priv;

	while (1)
	{
		do
		{
			if ((retval = gdb_get_char(connection, &character)) != ERROR_OK)
				return retval;

#ifdef _DEBUG_GDB_IO_
576
			LOG_DEBUG("character: '%c'", character);
577
578
579
580
581
582
583
#endif

			switch (character)
			{
				case '$':
					break;
				case '+':
584
585
					/* gdb sends a dummy ack '+' at every remote connect - see remote_start_remote (remote.c)
					 * incase anyone tries to debug why they receive this warning every time */
586
					LOG_WARNING("acknowledgment received, but no packet pending");
587
588
					break;
				case '-':
589
					LOG_WARNING("negative acknowledgment, but no packet pending");
590
591
592
593
594
595
					break;
				case 0x3:
					gdb_con->ctrl_c = 1;
					*len = 0;
					return ERROR_OK;
				default:
596
					LOG_WARNING("ignoring character 0x%x", character);
597
598
599
600
					break;
			}
		} while (character != '$');

ntfreak's avatar
ntfreak committed
601
602


603
		int checksum_ok = 0;
oharboe's avatar
oharboe committed
604
605
606
607
608
609
		/* explicit code expansion here to get faster inlined code in -O3 by not
		 * calculating checksum
		 */
		if (gdb_con->noack_mode)
		{
			if ((retval=fetch_packet(connection, &checksum_ok, 1, len, buffer))!=ERROR_OK)
610
				return retval;
oharboe's avatar
oharboe committed
611
		} else
612
		{
oharboe's avatar
oharboe committed
613
614
			if ((retval=fetch_packet(connection, &checksum_ok, 0, len, buffer))!=ERROR_OK)
				return retval;
615
616
		}

oharboe's avatar
oharboe committed
617
		if (gdb_con->noack_mode)
618
		{
oharboe's avatar
oharboe committed
619
620
			/* checksum is not checked in noack mode */
			break;
621
		}
oharboe's avatar
oharboe committed
622
		if (checksum_ok)
623
		{
624
625
626
627
			if ((retval = gdb_write(connection, "+", 1)) != ERROR_OK)
			{
				return retval;
			}
628
629
			break;
		}
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
	}
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;

	return ERROR_OK;
}

int gdb_get_packet(connection_t *connection, char *buffer, int *len)
{
	gdb_connection_t *gdb_con = connection->priv;
	gdb_con->busy = 1;
	int retval = gdb_get_packet_inner(connection, buffer, len);
	gdb_con->busy = 0;
	return retval;
}
ntfreak's avatar
ntfreak committed
645

646
int gdb_output_con(connection_t *connection, const char* line)
647
648
649
650
651
652
{
	char *hex_buffer;
	int i, bin_size;

	bin_size = strlen(line);

653
	hex_buffer = malloc(bin_size*2 + 2);
654
655
	if (hex_buffer == NULL)
		return ERROR_GDB_BUFFER_TOO_SMALL;
656
657
658
659

	hex_buffer[0] = 'O';
	for (i=0; i<bin_size; i++)
		snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
660
	hex_buffer[bin_size*2+1] = 0;
661

662
	int retval = gdb_put_packet(connection, hex_buffer, bin_size*2 + 1);
663
664

	free(hex_buffer);
665
	return retval;
666
667
}

oharboe's avatar
oharboe committed
668
int gdb_output(struct command_context_s *context, const char* line)
669
670
{
	/* this will be dumped to the log and also sent as an O packet if possible */
671
	LOG_USER_N("%s", line);
672
673
674
675
	return ERROR_OK;
}


676
677
678
static void gdb_frontend_halted(struct target_s *target, connection_t *connection)
{
	gdb_connection_t *gdb_connection = connection->priv;
679

680
681
682
683
684
685
686
687
688
689
690
691
692
	/* In the GDB protocol when we are stepping or coninuing execution,
	 * we have a lingering reply. Upon receiving a halted event
	 * when we have that lingering packet, we reply to the original
	 * step or continue packet.
	 *
	 * Executing monitor commands can bring the target in and
	 * out of the running state so we'll see lots of TARGET_EVENT_XXX
	 * that are to be ignored.
	 */
	if (gdb_connection->frontend_state == TARGET_RUNNING)
	{
		char sig_reply[4];
		int signal;
693

694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
		/* stop forwarding log packets! */
		log_remove_callback(gdb_log_callback, connection);

		if (gdb_connection->ctrl_c)
		{
			signal = 0x2;
			gdb_connection->ctrl_c = 0;
		}
		else
		{
			signal = gdb_last_signal(target);
		}

		snprintf(sig_reply, 4, "T%2.2x", signal);
		gdb_put_packet(connection, sig_reply, 3);
		gdb_connection->frontend_state = TARGET_HALTED;
	}
}

713
714
int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
{
715
	int retval;
716
717
	connection_t *connection = priv;

718
	target_handle_event( target, event );
719
720
	switch (event)
	{
721
		case TARGET_EVENT_EARLY_HALTED:
722
			gdb_frontend_halted(target, connection);
723
			break;
724
725
726
		case TARGET_EVENT_HALTED:
			target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
			break;
727
		case TARGET_EVENT_GDB_FLASH_ERASE_START:
728
			target_handle_event( target, TARGET_EVENT_OLD_gdb_program_config );
729
730
731
732
			if((retval = jtag_execute_queue()) != ERROR_OK)
			{
				return retval;
			}
733
734
735
736
737
738
739
			break;
		default:
			break;
	}

	return ERROR_OK;
}
ntfreak's avatar
ntfreak committed
740

741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
int gdb_new_connection(connection_t *connection)
{
	gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t));
	gdb_service_t *gdb_service = connection->service->priv;
	int retval;
	int initial_ack;

	connection->priv = gdb_connection;

	/* initialize gdb connection information */
	gdb_connection->buf_p = gdb_connection->buffer;
	gdb_connection->buf_cnt = 0;
	gdb_connection->ctrl_c = 0;
	gdb_connection->frontend_state = TARGET_HALTED;
	gdb_connection->vflash_image = NULL;
	gdb_connection->closed = 0;
	gdb_connection->busy = 0;
758
	gdb_connection->noack_mode = 0;
759

760
761
	/* send ACK to GDB for debug request */
	gdb_write(connection, "+", 1);
ntfreak's avatar
ntfreak committed
762

763
764
765
	/* output goes through gdb connection */
	command_set_output_handler(connection->cmd_ctx, gdb_output, connection);

766
	/* we must remove all breakpoints registered to the target as a previous
767
	 * GDB session could leave dangling breakpoints if e.g. communication
768
769
770
771
	 * timed out.
	 */
	breakpoint_clear_target(gdb_service->target);
	watchpoint_clear_target(gdb_service->target);
772

773
	/* register callback to be informed about target events */
ntfreak's avatar
ntfreak committed
774
	target_register_event_callback(gdb_target_callback_event_handler, connection);
775

776
	/* a gdb session just attached, try to put the target in halt mode.
777
778
779
	 *
	 * DANGER!!!!
	 *
780
781
782
783
	 * If the halt fails(e.g. target needs a reset, JTAG communication not
	 * working, etc.), then the GDB connect will succeed as
	 * the get_gdb_reg_list() will lie and return a register list with
	 * dummy values.
784
	 *
785
786
	 * This allows GDB monitor commands to be run from a GDB init script to
	 * initialize the target
787
	 *
788
789
	 * Also, since the halt() is asynchronous target connect will be
	 * instantaneous and thus avoiding annoying timeout problems during
790
	 * connect.
791
	 */
792
	target_halt(gdb_service->target);
793
	/* FIX!!!! could extended-remote work better here?
794
	 *
795
	 *  wait a tiny bit for halted state or we just continue. The
796
	 * GDB register packet will then contain garbage
797
798
	 */
	target_wait_state(gdb_service->target, TARGET_HALTED, 500);
799

800
801
802
803
	/* remove the initial ACK from the incoming buffer */
	if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
		return retval;

804
	/* FIX!!!??? would we actually ever receive a + here???
805
806
	 * Not observed.
	 */
807
808
	if (initial_ack != '+')
		gdb_putback_char(connection, initial_ack);
809
	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH );
810
811
812
	return ERROR_OK;
}

ntfreak's avatar
ntfreak committed
813
int gdb_connection_closed(connection_t *connection)
814
815
816
817
818
819
820
821
822
823
824
825
826
827
{
	gdb_service_t *gdb_service = connection->service->priv;
	gdb_connection_t *gdb_connection = connection->priv;

	/* see if an image built with vFlash commands is left */
	if (gdb_connection->vflash_image)
	{
		image_close(gdb_connection->vflash_image);
		free(gdb_connection->vflash_image);
		gdb_connection->vflash_image = NULL;
	}

	/* if this connection registered a debug-message receiver delete it */
	delete_debug_msg_receiver(connection->cmd_ctx, gdb_service->target);
ntfreak's avatar
ntfreak committed
828

829
830
831
832
833
834
835
	if (connection->priv)
	{
		free(connection->priv);
		connection->priv = NULL;
	}
	else
	{
836
		LOG_ERROR("BUG: connection->priv == NULL");
837
838
839
	}

	target_unregister_event_callback(gdb_target_callback_event_handler, connection);
840
	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);
841
842
	log_remove_callback(gdb_log_callback, connection);

843
	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH );
ntfreak's avatar
ntfreak committed
844
845

	return ERROR_OK;
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
}

void gdb_send_error(connection_t *connection, u8 the_error)
{
	char err[4];
	snprintf(err, 4, "E%2.2X", the_error );
	gdb_put_packet(connection, err, 3);
}

int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
{
	char sig_reply[4];
	int signal;

	signal = gdb_last_signal(target);

	snprintf(sig_reply, 4, "S%2.2x", signal);
	gdb_put_packet(connection, sig_reply, 3);

	return ERROR_OK;
}

868
869
870
871
872
873
874
875
876
static int gdb_reg_pos(target_t *target, int pos, int len)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		return pos;
	else
		return len - 1 - pos;
}

/* Convert register to string of bytes. NB! The # of bits in the
877
 * register might be non-divisible by 8(a byte), in which
878
879
880
881
882
883
884
 * case an entire byte is shown.
 *
 * NB! the format on the wire is the target endianess
 *
 * The format of reg->value is little endian
 *
 */
885
886
887
888
889
890
891
void gdb_str_to_target(target_t *target, char *tstr, reg_t *reg)
{
	int i;

	u8 *buf;
	int buf_len;
	buf = reg->value;
ntfreak's avatar
ntfreak committed
892
	buf_len = CEIL(reg->size, 8);
893

oharboe's avatar
   
oharboe committed
894
	for (i = 0; i < buf_len; i++)
895
	{
896
897
898
		int j = gdb_reg_pos(target, i, buf_len);
		tstr[i*2]   = DIGITS[(buf[j]>>4) & 0xf];
		tstr[i*2+1] = DIGITS[buf[j]&0xf];
ntfreak's avatar
ntfreak committed
899
	}
900
901
}

902
static int hextoint(char c)
903
{
904
905
906
907
908
909
910
911
912
913
914
915
	if (c>='0'&&c<='9')
	{
		return c-'0';
	}
	c=toupper(c);
	if (c>='A'&&c<='F')
	{
		return c-'A'+10;
	}
	LOG_ERROR("BUG: invalid register value %08x", c);
	return 0;
}
916

917
918
919
/* copy over in register buffer */
void gdb_target_to_reg(target_t *target, char *tstr, int str_len, u8 *bin)
{
920
921
	if (str_len % 2)
	{
922
		LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
923
924
925
		exit(-1);
	}

926
	int i;
oharboe's avatar
   
oharboe committed
927
	for (i = 0; i < str_len; i+=2)
928
	{
929
		u8 t = hextoint(tstr[i])<<4;
930
		t |= hextoint(tstr[i+1]);
931
932
933

		int j = gdb_reg_pos(target, i/2, str_len/2);
		bin[j] = t;
ntfreak's avatar
ntfreak committed
934
	}
935
936
937
938
939
940
941
942
943
944
945
946
947
}

int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
{
	reg_t **reg_list;
	int reg_list_size;
	int retval;
	int reg_packet_size = 0;
	char *reg_packet;
	char *reg_packet_p;
	int i;

#ifdef _DEBUG_GDB_IO_
948
	LOG_DEBUG("-");
949
950
951
952
#endif

	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
953
		return gdb_error(connection, retval);
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
	}

	for (i = 0; i < reg_list_size; i++)
	{
		reg_packet_size += reg_list[i]->size;
	}

	reg_packet = malloc(CEIL(reg_packet_size, 8) * 2);
	reg_packet_p = reg_packet;

	for (i = 0; i < reg_list_size; i++)
	{
		gdb_str_to_target(target, reg_packet_p, reg_list[i]);
		reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
	}

#ifdef _DEBUG_GDB_IO_
	{
		char *reg_packet_p;
		reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2);
974
		LOG_DEBUG("reg_packet: %s", reg_packet_p);
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
		free(reg_packet_p);
	}
#endif

	gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2);
	free(reg_packet);

	free(reg_list);

	return ERROR_OK;
}

int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
{
	int i;
	reg_t **reg_list;
	int reg_list_size;
	int retval;
	char *packet_p;

#ifdef _DEBUG_GDB_IO_
996
	LOG_DEBUG("-");
997
998
999
1000
#endif

	/* skip command character */
	packet++;
For faster browsing, not all history is shown. View entire blame