gdb_server.c 49.1 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
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
40
41
42
43
44
45
/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   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"
#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

46
extern int gdb_error(connection_t *connection, int retval);
47
48
49
static unsigned short gdb_port;
static const char *DIGITS = "0123456789abcdef";

ntfreak's avatar
ntfreak committed
50
static void gdb_log_callback(void *priv, const char *file, int line,
51
		const char *function, const char *string);
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87

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 */
int gdb_use_memory_map = 0;
int gdb_flash_program = 0;

/* 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:
88
			LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason);
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
			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;
	}
	
	FD_ZERO(&read_fds);
	FD_SET(connection->fd, &read_fds);
	
	tv.tv_sec = timeout_s;
	tv.tv_usec = 0;
	if (select(connection->fd + 1, &read_fds, NULL, NULL, &tv) == 0)
	{
		/* 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;
		}
129
	}
130
131
	*got_data=FD_ISSET(connection->fd, &read_fds)!=0;
	return ERROR_OK;
132
133
134
135
136
}

int gdb_get_char(connection_t *connection, int* next_char)
{
	gdb_connection_t *gdb_con = connection->priv;
137
	int retval=ERROR_OK;
138
139
140
141
142
143
144
145
146
147
148
149
150
151

#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_
152
		LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
153
154
155
156
157
158
159
#endif

		return ERROR_OK;
	}

	for (;;)
	{
160
161
162
		retval=check_pending(connection, 1, NULL);
		if (retval!=ERROR_OK)
			return retval;
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
		gdb_con->buf_cnt = read_socket(connection->fd, gdb_con->buffer, GDB_BUFFER_SIZE);
		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:
183
				gdb_con->closed = 1;
184
185
				return ERROR_SERVER_REMOTE_CLOSED;
			case WSAECONNRESET:
186
				gdb_con->closed = 1;
187
188
				return ERROR_SERVER_REMOTE_CLOSED;
			default:
189
				LOG_ERROR("read: %d", errno);
190
191
192
193
194
195
196
197
198
				exit(-1);
		}
#else
		switch(errno)
		{
			case EAGAIN:
				usleep(1000);
				break;
			case ECONNABORTED:
199
				gdb_con->closed = 1;
200
201
				return ERROR_SERVER_REMOTE_CLOSED;
			case ECONNRESET:
202
				gdb_con->closed = 1;
203
204
				return ERROR_SERVER_REMOTE_CLOSED;
			default:
205
				LOG_ERROR("read: %s", strerror(errno));
206
				gdb_con->closed = 1;
207
208
209
210
211
212
213
214
215
				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;
216
	LOG_DEBUG("received '%s'", debug_buffer);
217
218
219
220
221
222
223
224
225
	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
226
		connection->input_pending = 0;
227
#ifdef _DEBUG_GDB_IO_
228
	LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
229
230
#endif

231
	return retval;
232
233
234
235
236
237
238
239
240
241
242
243
244
}

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
	{
245
		LOG_ERROR("BUG: couldn't put character back");
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
	}

	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;

	if (write_socket(connection->fd, data, len) == len)
	{
		return ERROR_OK;
	}
	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];

282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
#ifdef _DEBUG_GDB_IO_
	/* 
	 * 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.
	 */
#ifndef _WIN32
	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;
298
		LOG_WARNING("Discard unexpected char %c", reply);
299
300
301
302
	}
#endif
#endif

303
304
305
306
307
308
	while (1)
	{
#ifdef _DEBUG_GDB_IO_
		debug_buffer = malloc(len + 1);
		memcpy(debug_buffer, buffer, len);
		debug_buffer[len] = 0;
309
		LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
310
311
		free(debug_buffer);
#endif
ntfreak's avatar
ntfreak committed
312

313
314
315
		char local_buffer[1024];
		local_buffer[0] = '$';
		if (len+4 <= sizeof(local_buffer))
316
		{
317
318
319
320
321
322
			/* 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];
			gdb_write(connection, local_buffer, len);
323
		}
324
		else
325
		{
326
327
328
329
330
331
332
333
			/* 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];
			gdb_write(connection, local_buffer, 1);
			gdb_write(connection, buffer, len);
			gdb_write(connection, local_buffer+1, 3);
334
		}
335

336
337
338
339
340
341
342
343
344
		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);
345
			LOG_WARNING("negative reply, retrying");
346
347
348
349
350
351
352
353
354
355
356
357
		}
		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);
358
				LOG_WARNING("negative reply, retrying");
359
360
361
			}
			else
			{
362
				LOG_ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
363
				gdb_con->closed=1;
364
365
366
367
368
				return ERROR_SERVER_REMOTE_CLOSED;
			}
		}
		else
		{
369
			LOG_ERROR("unknown character 0x%2.2x in reply, dropping connection", reply);
370
			gdb_con->closed=1;
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
			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;
	return retval;
}

int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len)
{
	int character;
	int count = 0;
	int retval;
	char checksum[3];
	unsigned char my_checksum = 0;
	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_
406
			LOG_DEBUG("character: '%c'", character);
407
408
409
410
411
412
413
#endif

			switch (character)
			{
				case '$':
					break;
				case '+':
414
					LOG_WARNING("acknowledgment received, but no packet pending");
415
416
					break;
				case '-':
417
					LOG_WARNING("negative acknowledgment, but no packet pending");
418
419
420
421
422
423
					break;
				case 0x3:
					gdb_con->ctrl_c = 1;
					*len = 0;
					return ERROR_OK;
				default:
424
					LOG_WARNING("ignoring character 0x%x", character);
425
426
427
428
429
					break;
			}
		} while (character != '$');

		my_checksum = 0;
ntfreak's avatar
ntfreak committed
430

431
432
433
434
435
436
		count = 0;
		gdb_connection_t *gdb_con = connection->priv;
		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
ntfreak's avatar
ntfreak committed
437
			 * gdb_get_char() update various bits and bobs correctly.
438
439
440
441
442
			 */
			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
ntfreak's avatar
ntfreak committed
443
444
				 * change inside the loop
				 */
445
446
447
448
449
450
451
452
453
454
455
				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 == '#')
					{
ntfreak's avatar
ntfreak committed
456
						/* Danger! character can be '#' when esc is
457
458
459
460
461
						 * used so we need an explicit boolean for done here.
						 */
						done = 1;
						break;
					}
ntfreak's avatar
ntfreak committed
462

463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
					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;
ntfreak's avatar
ntfreak committed
480
				if (done)
481
					break;
ntfreak's avatar
ntfreak committed
482
			}
483
484
			if (count > *len)
			{
485
				LOG_ERROR("packet buffer too small");
486
487
				return ERROR_GDB_BUFFER_TOO_SMALL;
			}
ntfreak's avatar
ntfreak committed
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
			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;

		if (my_checksum == strtoul(checksum, NULL, 16))
		{
			gdb_write(connection, "+", 1);
			break;
		}

529
		LOG_WARNING("checksum error, requesting retransmission");
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
		gdb_write(connection, "-", 1);
	}
	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
546

547
int gdb_output_con(connection_t *connection, const char* line)
548
549
550
551
552
553
{
	char *hex_buffer;
	int i, bin_size;

	bin_size = strlen(line);

554
	hex_buffer = malloc(bin_size*2 + 2);
555
556
	if (hex_buffer == NULL)
		return ERROR_GDB_BUFFER_TOO_SMALL;
557
558
559
560

	hex_buffer[0] = 'O';
	for (i=0; i<bin_size; i++)
		snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
561
	hex_buffer[bin_size*2+1] = 0;
562

563
	gdb_put_packet(connection, hex_buffer, bin_size*2 + 1);
564
565
566
567
568
569
570
571

	free(hex_buffer);
	return ERROR_OK;
}

int gdb_output(struct command_context_s *context, char* line)
{
	/* this will be dumped to the log and also sent as an O packet if possible */
572
	LOG_USER_N("%s", line);
573
574
575
576
577
578
579
	return ERROR_OK;
}

int gdb_program_handler(struct target_s *target, enum target_event event, void *priv)
{
	FILE *script;
	struct command_context_s *cmd_ctx = priv;
ntfreak's avatar
ntfreak committed
580

581
582
	if (target->gdb_program_script)
	{
583
		script = open_file_from_path(target->gdb_program_script, "r");
584
585
		if (!script)
		{
586
			LOG_ERROR("couldn't open script file %s", target->gdb_program_script);
587
588
589
				return ERROR_OK;
		}

590
		LOG_INFO("executing gdb_program script '%s'", target->gdb_program_script);
591
592
		command_run_file(cmd_ctx, script, COMMAND_EXEC);
		fclose(script);
ntfreak's avatar
ntfreak committed
593

594
595
		jtag_execute_queue();
	}
ntfreak's avatar
ntfreak committed
596

597
598
599
600
601
602
603
604
605
606
607
608
609
610
	return ERROR_OK;
}

int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
{
	connection_t *connection = priv;
	gdb_connection_t *gdb_connection = connection->priv;
	char sig_reply[4];
	int signal;

	switch (event)
	{
		case TARGET_EVENT_HALTED:
			/* In the GDB protocol when we are stepping or coninuing execution,
ntfreak's avatar
ntfreak committed
611
			 * we have a lingering reply. Upon receiving a halted event
612
613
			 * when we have that lingering packet, we reply to the original
			 * step or continue packet.
ntfreak's avatar
ntfreak committed
614
			 *
615
616
617
618
619
620
621
622
			 * 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)
			{
				/* stop forwarding log packets! */
				log_remove_callback(gdb_log_callback, connection);
ntfreak's avatar
ntfreak committed
623

624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
				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;
			}
			break;
		case TARGET_EVENT_GDB_PROGRAM:
			gdb_program_handler(target, event, connection->cmd_ctx);
			break;
		default:
			break;
	}

	return ERROR_OK;
}
ntfreak's avatar
ntfreak committed
648
649


650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
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;
667
668
669
	
	/* send ACK to GDB for debug request */
	gdb_write(connection, "+", 1);
ntfreak's avatar
ntfreak committed
670

671
672
673
674
	/* output goes through gdb connection */
	command_set_output_handler(connection->cmd_ctx, gdb_output, connection);

	/* register callback to be informed about target events */
ntfreak's avatar
ntfreak committed
675
	target_register_event_callback(gdb_target_callback_event_handler, connection);
676

677
	/* a gdb session just attached, try to put the target in halt mode.
oharboe's avatar
   
oharboe committed
678
679
	 * 
	 * DANGER!!!! 
680
681
682
683
684
685
686
687
688
689
690
691
	 * 
	 * 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.
	 * 
	 * This allows GDB monitor commands to be run from a GDB init script to
	 * initialize the target
	 * 
	 * Also, since the halt() is asynchronous target connect will be
	 * instantaneous and thus avoiding annoying timeout problems during
	 * connect. 
692
	 */
693
	target_halt(gdb_service->target);
694
	
695
696
697
698
	/* remove the initial ACK from the incoming buffer */
	if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
		return retval;

699
700
701
	/* FIX!!!??? would we actually ever receive a + here??? 
	 * Not observed.
	 */
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
	if (initial_ack != '+')
		gdb_putback_char(connection, initial_ack);

	return ERROR_OK;
}

int gdb_connection_closed(connection_t *connection)
{
	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
723

724
725
726
727
728
729
730
	if (connection->priv)
	{
		free(connection->priv);
		connection->priv = NULL;
	}
	else
	{
731
		LOG_ERROR("BUG: connection->priv == NULL");
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
	}

	target_unregister_event_callback(gdb_target_callback_event_handler, connection);
	log_remove_callback(gdb_log_callback, connection);

	return ERROR_OK;
}

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;
}

/* Convert register to string of bits. NB! The # of bits in the
 * register might be non-divisible by 8(a byte), in which
 * case an entire byte is shown. */
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
770
	buf_len = CEIL(reg->size, 8);
771

oharboe's avatar
   
oharboe committed
772
	for (i = 0; i < buf_len; i++)
773
	{
oharboe's avatar
   
oharboe committed
774
775
		tstr[i*2]   = DIGITS[(buf[i]>>4) & 0xf];
		tstr[i*2+1] = DIGITS[buf[i]&0xf];
ntfreak's avatar
ntfreak committed
776
	}
777
778
779
780
781
782
783
784
785
}

void gdb_target_to_str(target_t *target, char *tstr, char *str)
{
	int str_len = strlen(tstr);
	int i;

	if (str_len % 2)
	{
786
		LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
787
788
789
		exit(-1);
	}

oharboe's avatar
   
oharboe committed
790
	for (i = 0; i < str_len; i+=2)
791
	{
oharboe's avatar
   
oharboe committed
792
793
		str[str_len - i - 1] = tstr[i + 1];
		str[str_len - i - 2] = tstr[i];
ntfreak's avatar
ntfreak committed
794
	}
795
796
797
798
799
800
801
802
803
804
805
806
807
}

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_
808
	LOG_DEBUG("-");
809
810
811
812
#endif

	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
813
		return gdb_error(connection, retval);
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
	}

	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);
834
		LOG_DEBUG("reg_packet: %s", reg_packet_p);
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
		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_
856
	LOG_DEBUG("-");
857
858
859
860
861
862
863
864
#endif

	/* skip command character */
	packet++;
	packet_size--;

	if (packet_size % 2)
	{
865
		LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection");
866
867
868
869
870
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
871
		return gdb_error(connection, retval);
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
	}

	packet_p = packet;
	for (i = 0; i < reg_list_size; i++)
	{
		u8 *bin_buf;
		char *hex_buf;
		reg_arch_type_t *arch_type;

		/* convert from GDB-string (target-endian) to hex-string (big-endian) */
		hex_buf = malloc(CEIL(reg_list[i]->size, 8) * 2);
		gdb_target_to_str(target, packet_p, hex_buf);

		/* convert hex-string to binary buffer */
		bin_buf = malloc(CEIL(reg_list[i]->size, 8));
		str_to_buf(hex_buf, CEIL(reg_list[i]->size, 8) * 2, bin_buf, reg_list[i]->size, 16);

ntfreak's avatar
ntfreak committed
889
		/* get register arch_type, and call set method */
890
891
892
		arch_type = register_get_arch_type(reg_list[i]->arch_type);
		if (arch_type == NULL)
		{
893
			LOG_ERROR("BUG: encountered unregistered arch type");
894
895
896
897
			exit(-1);
		}
		arch_type->set(reg_list[i], bin_buf);

ntfreak's avatar
ntfreak committed
898
		/* advance packet pointer */
899
900
901
902
903
904
		packet_p += (CEIL(reg_list[i]->size, 8) * 2);

		free(bin_buf);
		free(hex_buf);
	}

ntfreak's avatar
ntfreak committed
905
	/* free reg_t *reg_list[] array allocated by get_gdb_reg_list */
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
	free(reg_list);

	gdb_put_packet(connection, "OK", 2);

	return ERROR_OK;
}

int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
{
	char *reg_packet;
	int reg_num = strtoul(packet + 1, NULL, 16);
	reg_t **reg_list;
	int reg_list_size;
	int retval;

#ifdef _DEBUG_GDB_IO_
922
	LOG_DEBUG("-");
923
924
925
926
#endif

	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
927
		return gdb_error(connection, retval);
928
929
930
931
	}

	if (reg_list_size <= reg_num)
	{
932
		LOG_ERROR("gdb requested a non-existing register");
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
		exit(-1);
	}

	reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);

	gdb_str_to_target(target, reg_packet, reg_list[reg_num]);

	gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);

	free(reg_list);
	free(reg_packet);

	return ERROR_OK;
}

int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
{
	char *separator;
	char *hex_buf;
	u8 *bin_buf;
	int reg_num = strtoul(packet + 1, &separator, 16);
	reg_t **reg_list;
	int reg_list_size;
	int retval;
	reg_arch_type_t *arch_type;

959
	LOG_DEBUG("-");
960
961
962

	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
963
		return gdb_error(connection, retval);
964
965
966
967
	}

	if (reg_list_size < reg_num)
	{
968
		LOG_ERROR("gdb requested a non-existing register");
969
		return ERROR_SERVER_REMOTE_CLOSED;	
970
971
972
973
	}

	if (*separator != '=')
	{
974
		LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
975
976
977
978
979
980
981
982
983
984
985
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	/* convert from GDB-string (target-endian) to hex-string (big-endian) */
	hex_buf = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
	gdb_target_to_str(target, separator + 1, hex_buf);

	/* convert hex-string to binary buffer */
	bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8));
	str_to_buf(hex_buf, CEIL(reg_list[reg_num]->size, 8) * 2, bin_buf, reg_list[reg_num]->size, 16);

ntfreak's avatar
ntfreak committed
986
	/* get register arch_type, and call set method */
987
988
989
	arch_type = register_get_arch_type(reg_list[reg_num]->arch_type);
	if (arch_type == NULL)
	{
990
		LOG_ERROR("BUG: encountered unregistered arch type");
991
992
993
994
995
996
997
998
999
1000
		exit(-1);
	}
	arch_type->set(reg_list[reg_num], bin_buf);

	gdb_put_packet(connection, "OK", 2);

	free(bin_buf);
	free(hex_buf);
	free(reg_list);

For faster browsing, not all history is shown. View entire blame