aboutsummaryrefslogtreecommitdiff
path: root/src/server/gdb_server.c
blob: 21dc24c9e1c74b2a51033b1bb0e4338a30242591 (plain)
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
46
47
48
49
50
51
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
88
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
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
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
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
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
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
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
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
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
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
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
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
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
 *   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 "breakpoints.h"
#include "target_request.h"
#include "register.h"
#include "server.h"
#include "flash.h"
#include "gdb_server.h"
#include "image.h"
#include "jtag.h"


#if 0
#define _DEBUG_GDB_IO_
#endif

static struct gdb_connection *current_gdb_connection;

static int gdb_breakpoint_override;
static enum breakpoint_type gdb_breakpoint_override_type;

extern int gdb_error(struct connection *connection, int retval);
static unsigned short gdb_port = 3333;
static const char *DIGITS = "0123456789abcdef";

static void gdb_log_callback(void *priv, const char *file, unsigned line,
		const char *function, const char *string);

/* number of gdb connections, mainly to supress gdb related debugging spam
 * in helper/log.c when no gdb connections are actually active */
int gdb_actual_connections;

/* set if we are sending a memory map to gdb
 * via qXfer:memory-map:read packet */
/* enabled by default*/
int gdb_use_memory_map = 1;
/* enabled by default*/
int gdb_flash_program = 1;

/* 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(struct target *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:
			LOG_USER("undefined debug reason %d - target needs reset", target->debug_reason);
			return 0x0;
	}
}

int check_pending(struct connection *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;
	struct gdb_connection *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 (socket_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;
		}
	}
	*got_data = FD_ISSET(connection->fd, &read_fds) != 0;
	return ERROR_OK;
}

int gdb_get_char(struct connection *connection, int* next_char)
{
	struct gdb_connection *gdb_con = connection->priv;
	int retval = ERROR_OK;

#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_
		LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
#endif

		return ERROR_OK;
	}

	for (;;)
	{
		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);
		}

		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:
				gdb_con->closed = 1;
				return ERROR_SERVER_REMOTE_CLOSED;
			case WSAECONNRESET:
				gdb_con->closed = 1;
				return ERROR_SERVER_REMOTE_CLOSED;
			default:
				LOG_ERROR("read: %d", errno);
				exit(-1);
		}
#else
		switch (errno)
		{
			case EAGAIN:
				usleep(1000);
				break;
			case ECONNABORTED:
				gdb_con->closed = 1;
				return ERROR_SERVER_REMOTE_CLOSED;
			case ECONNRESET:
				gdb_con->closed = 1;
				return ERROR_SERVER_REMOTE_CLOSED;
			default:
				LOG_ERROR("read: %s", strerror(errno));
				gdb_con->closed = 1;
				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;
	LOG_DEBUG("received '%s'", debug_buffer);
	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
		connection->input_pending = 0;
#ifdef _DEBUG_GDB_IO_
	LOG_DEBUG("returned char '%c' (0x%2.2x)", *next_char, *next_char);
#endif

	return retval;
}

int gdb_putback_char(struct connection *connection, int last_char)
{
	struct gdb_connection *gdb_con = connection->priv;

	if (gdb_con->buf_p > gdb_con->buffer)
	{
		*(--gdb_con->buf_p) = last_char;
		gdb_con->buf_cnt++;
	}
	else
	{
		LOG_ERROR("BUG: couldn't put character back");
	}

	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(struct connection *connection, void *data, int len)
{
	struct gdb_connection *gdb_con = connection->priv;
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;

	if (connection->service->type == CONNECTION_PIPE)
	{
		/* 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;
		}
	}
	gdb_con->closed = 1;
	return ERROR_SERVER_REMOTE_CLOSED;
}

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

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

#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.
	 */
	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;
		if (reply == '$') {
			/* fix a problem with some IAR tools */
			gdb_putback_char(connection, reply);
			LOG_DEBUG("Unexpected start of new packet");
			break;
		}

		LOG_WARNING("Discard unexpected char %c", reply);
	}
#endif

	while (1)
	{
#ifdef _DEBUG_GDB_IO_
		debug_buffer = malloc(len + 1);
		memcpy(debug_buffer, buffer, len);
		debug_buffer[len] = 0;
		LOG_DEBUG("sending packet '$%s#%2.2x'", debug_buffer, my_checksum);
		free(debug_buffer);
#endif

		char local_buffer[1024];
		local_buffer[0] = '$';
		if ((size_t)len + 4 <= sizeof(local_buffer))
		{
			/* 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];
			if ((retval = gdb_write(connection, local_buffer, len)) != ERROR_OK)
			{
				return retval;
			}
		}
		else
		{
			/* 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];
			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;
			}
		}

		if (gdb_con->noack_mode)
			break;

		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);
			LOG_WARNING("negative reply, retrying");
		}
		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);
				LOG_WARNING("negative reply, retrying");
			}
			else if (reply == '$') {
				LOG_ERROR("GDB missing ack(1) - assumed good");
				gdb_putback_char(connection, reply);
				return ERROR_OK;
			} else {

				LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
				gdb_con->closed = 1;
				return ERROR_SERVER_REMOTE_CLOSED;
			}
		}
		else if (reply == '$') {
			LOG_ERROR("GDB missing ack(2) - assumed good");
			gdb_putback_char(connection, reply);
			return ERROR_OK;
		}
		else
		{
			LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection", reply);
			gdb_con->closed = 1;
			return ERROR_SERVER_REMOTE_CLOSED;
		}
	}
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;

	return ERROR_OK;
}

int gdb_put_packet(struct connection *connection, char *buffer, int len)
{
	struct gdb_connection *gdb_con = connection->priv;
	gdb_con->busy = 1;
	int retval = gdb_put_packet_inner(connection, buffer, len);
	gdb_con->busy = 0;

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

	return retval;
}

static __inline__ int fetch_packet(struct connection *connection, int *checksum_ok, int noack, int *len, char *buffer)
{
	unsigned char my_checksum = 0;
	char checksum[3];
	int character;
	int retval;

	struct gdb_connection *gdb_con = connection->priv;
	my_checksum = 0;
	int count = 0;
	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;

	if (!noack)
	{
		*checksum_ok = (my_checksum == strtoul(checksum, NULL, 16));
	}

	return ERROR_OK;
}

int gdb_get_packet_inner(struct connection *connection, char *buffer, int *len)
{
	int character;
	int retval;
	struct gdb_connection *gdb_con = connection->priv;

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

#ifdef _DEBUG_GDB_IO_
			LOG_DEBUG("character: '%c'", character);
#endif

			switch (character)
			{
				case '$':
					break;
				case '+':
					/* gdb sends a dummy ack '+' at every remote connect - see remote_start_remote (remote.c)
					 * incase anyone tries to debug why they receive this warning every time */
					LOG_WARNING("acknowledgment received, but no packet pending");
					break;
				case '-':
					LOG_WARNING("negative acknowledgment, but no packet pending");
					break;
				case 0x3:
					gdb_con->ctrl_c = 1;
					*len = 0;
					return ERROR_OK;
				default:
					LOG_WARNING("ignoring character 0x%x", character);
					break;
			}
		} while (character != '$');



		int checksum_ok = 0;
		/* 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)
				return retval;
		} else
		{
			if ((retval = fetch_packet(connection, &checksum_ok, 0, len, buffer)) != ERROR_OK)
				return retval;
		}

		if (gdb_con->noack_mode)
		{
			/* checksum is not checked in noack mode */
			break;
		}
		if (checksum_ok)
		{
			if ((retval = gdb_write(connection, "+", 1)) != ERROR_OK)
			{
				return retval;
			}
			break;
		}
	}
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;

	return ERROR_OK;
}

int gdb_get_packet(struct connection *connection, char *buffer, int *len)
{
	struct gdb_connection *gdb_con = connection->priv;
	gdb_con->busy = 1;
	int retval = gdb_get_packet_inner(connection, buffer, len);
	gdb_con->busy = 0;
	return retval;
}

int gdb_output_con(struct connection *connection, const char* line)
{
	char *hex_buffer;
	int i, bin_size;

	bin_size = strlen(line);

	hex_buffer = malloc(bin_size*2 + 2);
	if (hex_buffer == NULL)
		return ERROR_GDB_BUFFER_TOO_SMALL;

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

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

	free(hex_buffer);
	return retval;
}

int gdb_output(struct command_context *context, const char* line)
{
	/* this will be dumped to the log and also sent as an O packet if possible */
	LOG_USER_N("%s", line);
	return ERROR_OK;
}


static void gdb_frontend_halted(struct target *target, struct connection *connection)
{
	struct gdb_connection *gdb_connection = connection->priv;

	/* In the GDB protocol when we are stepping or continuing 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;

		/* 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;
	}
}

int gdb_target_callback_event_handler(struct target *target, enum target_event event, void *priv)
{
	int retval;
	struct connection *connection = priv;

	target_handle_event(target, event);
	switch (event)
	{
		case TARGET_EVENT_GDB_HALT:
			gdb_frontend_halted(target, connection);
			break;
		case TARGET_EVENT_HALTED:
			target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
			break;
		case TARGET_EVENT_GDB_FLASH_ERASE_START:
			target_handle_event(target, TARGET_EVENT_OLD_gdb_program_config);
			if ((retval = jtag_execute_queue()) != ERROR_OK)
			{
				return retval;
			}
			break;
		default:
			break;
	}

	return ERROR_OK;
}

int gdb_new_connection(struct connection *connection)
{
	struct gdb_connection *gdb_connection = malloc(sizeof(struct gdb_connection));
	struct gdb_service *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;
	gdb_connection->noack_mode = 0;
	gdb_connection->sync = true;

	/* send ACK to GDB for debug request */
	gdb_write(connection, "+", 1);

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

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

	/* register callback to be informed about target events */
	target_register_event_callback(gdb_target_callback_event_handler, connection);

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

	/* FIX!!!??? would we actually ever receive a + here???
	 * Not observed.
	 */
	if (initial_ack != '+')
		gdb_putback_char(connection, initial_ack);
	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);

	gdb_actual_connections++;
	LOG_DEBUG("New GDB Connection: %d, Target %s, state: %s",
		  gdb_actual_connections,
		  gdb_service->target->cmd_name,
		  target_state_name(gdb_service->target));

	return ERROR_OK;
}

int gdb_connection_closed(struct connection *connection)
{
	struct gdb_service *gdb_service = connection->service->priv;
	struct gdb_connection *gdb_connection = connection->priv;

	/* we're done forwarding messages. Tear down callback before
	 * cleaning up connection.
	 */
	log_remove_callback(gdb_log_callback, connection);

	gdb_actual_connections--;
	LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d",
		  gdb_service->target->cmd_name,
		  target_state_name(gdb_service->target),
		  gdb_actual_connections);

	/* 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);

	if (connection->priv)
	{
		free(connection->priv);
		connection->priv = NULL;
	}
	else
	{
		LOG_ERROR("BUG: connection->priv == NULL");
	}


	target_unregister_event_callback(gdb_target_callback_event_handler, connection);

	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);

	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);

	return ERROR_OK;
}

void gdb_send_error(struct connection *connection, uint8_t the_error)
{
	char err[4];
	snprintf(err, 4, "E%2.2X", the_error);
	gdb_put_packet(connection, err, 3);
}

int gdb_last_signal_packet(struct connection *connection, struct target *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;
}

static int gdb_reg_pos(struct target *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
 * register might be non-divisible by 8(a byte), in which
 * case an entire byte is shown.
 *
 * NB! the format on the wire is the target endianess
 *
 * The format of reg->value is little endian
 *
 */
void gdb_str_to_target(struct target *target, char *tstr, struct reg *reg)
{
	int i;

	uint8_t *buf;
	int buf_len;
	buf = reg->value;
	buf_len = DIV_ROUND_UP(reg->size, 8);

	for (i = 0; i < buf_len; i++)
	{
		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];
	}
}

static int hextoint(char c)
{
	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;
}

/* copy over in register buffer */
void gdb_target_to_reg(struct target *target, char *tstr, int str_len, uint8_t *bin)
{
	if (str_len % 2)
	{
		LOG_ERROR("BUG: gdb value with uneven number of characters encountered");
		exit(-1);
	}

	int i;
	for (i = 0; i < str_len; i += 2)
	{
		uint8_t t = hextoint(tstr[i]) << 4;
		t |= hextoint(tstr[i + 1]);

		int j = gdb_reg_pos(target, i/2, str_len/2);
		bin[j] = t;
	}
}

int gdb_get_registers_packet(struct connection *connection, struct target *target, char* packet, int packet_size)
{
	struct reg **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_
	LOG_DEBUG("-");
#endif

	if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
		return gdb_error(connection, retval);
	}

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

	reg_packet = malloc(DIV_ROUND_UP(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 += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
	}

#ifdef _DEBUG_GDB_IO_
	{
		char *reg_packet_p;
		reg_packet_p = strndup(reg_packet, DIV_ROUND_UP(reg_packet_size, 8) * 2);
		LOG_DEBUG("reg_packet: %s", reg_packet_p);
		free(reg_packet_p);
	}
#endif

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

	free(reg_list);

	return ERROR_OK;
}

int gdb_set_registers_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	int i;
	struct reg **reg_list;
	int reg_list_size;
	int retval;
	char *packet_p;

#ifdef _DEBUG_GDB_IO_
	LOG_DEBUG("-");
#endif

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

	if (packet_size % 2)
	{
		LOG_WARNING("GDB set_registers packet with uneven characters received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
		return gdb_error(connection, retval);
	}

	packet_p = packet;
	for (i = 0; i < reg_list_size; i++)
	{
		uint8_t *bin_buf;
		int chars = (DIV_ROUND_UP(reg_list[i]->size, 8) * 2);

		if (packet_p + chars > packet + packet_size)
		{
			LOG_ERROR("BUG: register packet is too small for registers");
		}

		bin_buf = malloc(DIV_ROUND_UP(reg_list[i]->size, 8));
		gdb_target_to_reg(target, packet_p, chars, bin_buf);

		reg_list[i]->type->set(reg_list[i], bin_buf);

		/* advance packet pointer */
		packet_p += chars;


		free(bin_buf);
	}

	/* free struct reg *reg_list[] array allocated by get_gdb_reg_list */
	free(reg_list);

	gdb_put_packet(connection, "OK", 2);

	return ERROR_OK;
}

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

#ifdef _DEBUG_GDB_IO_
	LOG_DEBUG("-");
#endif

	if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
		return gdb_error(connection, retval);
	}

	if (reg_list_size <= reg_num)
	{
		LOG_ERROR("gdb requested a non-existing register");
		exit(-1);
	}

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

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

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

	free(reg_list);
	free(reg_packet);

	return ERROR_OK;
}

int gdb_set_register_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	char *separator;
	uint8_t *bin_buf;
	int reg_num = strtoul(packet + 1, &separator, 16);
	struct reg **reg_list;
	int reg_list_size;
	int retval;

	LOG_DEBUG("-");

	if ((retval = target_get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
	{
		return gdb_error(connection, retval);
	}

	if (reg_list_size < reg_num)
	{
		LOG_ERROR("gdb requested a non-existing register");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	if (*separator != '=')
	{
		LOG_ERROR("GDB 'set register packet', but no '=' following the register number");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	/* convert from GDB-string (target-endian) to hex-string (big-endian) */
	bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
	int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);

	/* fix!!! add some sanity checks on packet size here */

	gdb_target_to_reg(target, separator + 1, chars, bin_buf);

	reg_list[reg_num]->type->set(reg_list[reg_num], bin_buf);

	gdb_put_packet(connection, "OK", 2);

	free(bin_buf);
	free(reg_list);

	return ERROR_OK;
}

int gdb_error(struct connection *connection, int retval)
{
	switch (retval)
	{
		case ERROR_TARGET_DATA_ABORT:
			gdb_send_error(connection, EIO);
			break;
		case ERROR_TARGET_TRANSLATION_FAULT:
			gdb_send_error(connection, EFAULT);
			break;
		case ERROR_TARGET_UNALIGNED_ACCESS:
			gdb_send_error(connection, EFAULT);
			break;
		case ERROR_TARGET_NOT_HALTED:
			gdb_send_error(connection, EFAULT);
			break;
		default:
			/* This could be that the target reset itself. */
			LOG_ERROR("unexpected error %i", retval);
			gdb_send_error(connection, EFAULT);
			break;
	}

	return ERROR_OK;
}

/* We don't have to worry about the default 2 second timeout for GDB packets,
 * because GDB breaks up large memory reads into smaller reads.
 *
 * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
 */
int gdb_read_memory_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	char *separator;
	uint32_t addr = 0;
	uint32_t len = 0;

	uint8_t *buffer;
	char *hex_buffer;

	int retval = ERROR_OK;

	/* skip command character */
	packet++;

	addr = strtoul(packet, &separator, 16);

	if (*separator != ',')
	{
		LOG_ERROR("incomplete read memory packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	len = strtoul(separator + 1, NULL, 16);

	buffer = malloc(len);

	LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);

	retval = target_read_buffer(target, addr, len, buffer);

	if ((retval != ERROR_OK)&&!gdb_report_data_abort)
	{
		/* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
		 * At some point this might be fixed in GDB, in which case this code can be removed.
		 *
		 * OpenOCD developers are acutely aware of this problem, but there is nothing
		 * gained by involving the user in this problem that hopefully will get resolved
		 * eventually
		 *
		 * http://sourceware.org/cgi-bin/gnatsweb.pl?cmd = view%20audit-trail&database = gdb&pr = 2395
		 *
		 * For now, the default is to fix up things to make current GDB versions work.
		 * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
		 */
		memset(buffer, 0, len);
		retval = ERROR_OK;
	}

	if (retval == ERROR_OK)
	{
		hex_buffer = malloc(len * 2 + 1);

		uint32_t i;
		for (i = 0; i < len; i++)
		{
			uint8_t t = buffer[i];
			hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
			hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
		}

		gdb_put_packet(connection, hex_buffer, len * 2);

		free(hex_buffer);
	}
	else
	{
		retval = gdb_error(connection, retval);
	}

	free(buffer);

	return retval;
}

int gdb_write_memory_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	char *separator;
	uint32_t addr = 0;
	uint32_t len = 0;

	uint8_t *buffer;

	uint32_t i;
	int retval;

	/* skip command character */
	packet++;

	addr = strtoul(packet, &separator, 16);

	if (*separator != ',')
	{
		LOG_ERROR("incomplete write memory packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	len = strtoul(separator + 1, &separator, 16);

	if (*(separator++) != ':')
	{
		LOG_ERROR("incomplete write memory packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	buffer = malloc(len);

	LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);

	for (i = 0; i < len; i++)
	{
		uint32_t tmp;
		sscanf(separator + 2*i, "%2" SCNx32 , &tmp);
		buffer[i] = tmp;
	}

	retval = target_write_buffer(target, addr, len, buffer);

	if (retval == ERROR_OK)
	{
		gdb_put_packet(connection, "OK", 2);
	}
	else
	{
		retval = gdb_error(connection, retval);
	}

	free(buffer);

	return retval;
}

int gdb_write_memory_binary_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	char *separator;
	uint32_t addr = 0;
	uint32_t len = 0;

	int retval;

	/* skip command character */
	packet++;

	addr = strtoul(packet, &separator, 16);

	if (*separator != ',')
	{
		LOG_ERROR("incomplete write memory binary packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	len = strtoul(separator + 1, &separator, 16);

	if (*(separator++) != ':')
	{
		LOG_ERROR("incomplete write memory binary packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	retval = ERROR_OK;
	if (len)
	{
		LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);

		retval = target_write_buffer(target, addr, len, (uint8_t*)separator);
	}

	if (retval == ERROR_OK)
	{
		gdb_put_packet(connection, "OK", 2);
	}
	else
	{
		if ((retval = gdb_error(connection, retval)) != ERROR_OK)
			return retval;
	}

	return ERROR_OK;
}

int gdb_step_continue_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	int current = 0;
	uint32_t address = 0x0;
	int retval = ERROR_OK;

	LOG_DEBUG("-");

	if (packet_size > 1)
	{
		packet[packet_size] = 0;
		address = strtoul(packet + 1, NULL, 16);
	}
	else
	{
		current = 1;
	}

	if (packet[0] == 'c')
	{
		LOG_DEBUG("continue");
		target_handle_event(target, TARGET_EVENT_OLD_pre_resume);
		retval = target_resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
	}
	else if (packet[0] == 's')
	{
		LOG_DEBUG("step");
		/* step at current or address, don't handle breakpoints */
		retval = target_step(target, current, address, 0);
	}
	return retval;
}

int gdb_breakpoint_watchpoint_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	int type;
	enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
	enum watchpoint_rw wp_type;
	uint32_t address;
	uint32_t size;
	char *separator;
	int retval;

	LOG_DEBUG("-");

	type = strtoul(packet + 1, &separator, 16);

	if (type == 0)	/* memory breakpoint */
		bp_type = BKPT_SOFT;
	else if (type == 1) /* hardware breakpoint */
		bp_type = BKPT_HARD;
	else if (type == 2) /* write watchpoint */
		wp_type = WPT_WRITE;
	else if (type == 3) /* read watchpoint */
		wp_type = WPT_READ;
	else if (type == 4) /* access watchpoint */
		wp_type = WPT_ACCESS;

	if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT)||(bp_type == BKPT_HARD)))
	{
		bp_type = gdb_breakpoint_override_type;
	}

	if (*separator != ',')
	{
		LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	address = strtoul(separator + 1, &separator, 16);

	if (*separator != ',')
	{
		LOG_ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	size = strtoul(separator + 1, &separator, 16);

	switch (type)
	{
		case 0:
		case 1:
			if (packet[0] == 'Z')
			{
				if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK)
				{
					if ((retval = gdb_error(connection, retval)) != ERROR_OK)
						return retval;
				}
				else
				{
					gdb_put_packet(connection, "OK", 2);
				}
			}
			else
			{
				breakpoint_remove(target, address);
				gdb_put_packet(connection, "OK", 2);
			}
			break;
		case 2:
		case 3:
		case 4:
		{
			if (packet[0] == 'Z')
			{
				if ((retval = watchpoint_add(target, address, size, type-2, 0, 0xffffffffu)) != ERROR_OK)
				{
					if ((retval = gdb_error(connection, retval)) != ERROR_OK)
						return retval;
				}
				else
				{
					gdb_put_packet(connection, "OK", 2);
				}
			}
			else
			{
				watchpoint_remove(target, address);
				gdb_put_packet(connection, "OK", 2);
			}
			break;
		}
		default:
			break;
	}

	return ERROR_OK;
}

/* print out a string and allocate more space as needed, mainly used for XML at this point */
void xml_printf(int *retval, char **xml, int *pos, int *size, const char *fmt, ...)
{
	if (*retval != ERROR_OK)
	{
		return;
	}
	int first = 1;

	for (;;)
	{
		if ((*xml == NULL) || (!first))
		{
			/* start by 0 to exercise all the code paths.
			 * Need minimum 2 bytes to fit 1 char and 0 terminator. */

			*size = *size * 2 + 2;
			char *t = *xml;
			*xml = realloc(*xml, *size);
			if (*xml == NULL)
			{
				if (t)
					free(t);
				*retval = ERROR_SERVER_REMOTE_CLOSED;
				return;
			}
		}

		va_list ap;
		int ret;
		va_start(ap, fmt);
		ret = vsnprintf(*xml + *pos, *size - *pos, fmt, ap);
		va_end(ap);
		if ((ret > 0) && ((ret + 1) < *size - *pos))
		{
			*pos += ret;
			return;
		}
		/* there was just enough or not enough space, allocate more. */
		first = 0;
	}
}

static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len)
{
	char *separator;

	/* Extract and NUL-terminate the annex. */
	*annex = buf;
	while (*buf && *buf != ':')
		buf++;
	if (*buf == '\0')
		return -1;
	*buf++ = 0;

	/* After the read marker and annex, qXfer looks like a
	 * traditional 'm' packet. */

	*ofs = strtoul(buf, &separator, 16);

	if (*separator != ',')
		return -1;

	*len = strtoul(separator + 1, NULL, 16);

	return 0;
}

int gdb_calc_blocksize(struct flash_bank *bank)
{
	uint32_t i;
	uint32_t block_size = 0xffffffff;

	/* loop through all sectors and return smallest sector size */

	for (i = 0; i < (uint32_t)bank->num_sectors; i++)
	{
		if (bank->sectors[i].size < block_size)
			block_size = bank->sectors[i].size;
	}

	return block_size;
}

static int compare_bank (const void * a, const void * b)
{
	struct flash_bank *b1, *b2;
	b1=*((struct flash_bank **)a);
	b2=*((struct flash_bank **)b);

	if (b1->base == b2->base)
	{
		return 0;
	} else if (b1->base > b2->base)
	{
		return 1;
	} else
	{
		return -1;
	}
}

int gdb_query_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	struct command_context *cmd_ctx = connection->cmd_ctx;
	struct gdb_connection *gdb_connection = connection->priv;

	if (strstr(packet, "qRcmd,"))
	{
		if (packet_size > 6)
		{
			char *cmd;
			int i;
			cmd = malloc((packet_size - 6)/2 + 1);
			for (i = 0; i < (packet_size - 6)/2; i++)
			{
				uint32_t tmp;
				sscanf(packet + 6 + 2*i, "%2" SCNx32 , &tmp);
				cmd[i] = tmp;
			}
			cmd[(packet_size - 6)/2] = 0x0;

			/* We want to print all debug output to GDB connection */
			log_add_callback(gdb_log_callback, connection);
			target_call_timer_callbacks_now();
			/* some commands need to know the GDB connection, make note of current
			 * GDB connection. */
			current_gdb_connection = gdb_connection;
			command_run_line(cmd_ctx, cmd);
			current_gdb_connection = NULL;
			target_call_timer_callbacks_now();
			log_remove_callback(gdb_log_callback, connection);
			free(cmd);
		}
		gdb_put_packet(connection, "OK", 2);
		return ERROR_OK;
	}
	else if (strstr(packet, "qCRC:"))
	{
		if (packet_size > 5)
		{
			int retval;
			char gdb_reply[10];
			char *separator;
			uint32_t checksum;
			uint32_t addr = 0;
			uint32_t len = 0;

			/* skip command character */
			packet += 5;

			addr = strtoul(packet, &separator, 16);

			if (*separator != ',')
			{
				LOG_ERROR("incomplete read memory packet received, dropping connection");
				return ERROR_SERVER_REMOTE_CLOSED;
			}

			len = strtoul(separator + 1, NULL, 16);

			retval = target_checksum_memory(target, addr, len, &checksum);

			if (retval == ERROR_OK)
			{
				snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
				gdb_put_packet(connection, gdb_reply, 9);
			}
			else
			{
				if ((retval = gdb_error(connection, retval)) != ERROR_OK)
					return retval;
			}

			return ERROR_OK;
		}
	}
	else if (strstr(packet, "qSupported"))
	{
		/* we currently support packet size and qXfer:memory-map:read (if enabled)
		 * disable qXfer:features:read for the moment */
		int retval = ERROR_OK;
		char *buffer = NULL;
		int pos = 0;
		int size = 0;

		xml_printf(&retval, &buffer, &pos, &size,
				"PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-;QStartNoAckMode+",
				(GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-');

		if (retval != ERROR_OK)
		{
			gdb_send_error(connection, 01);
			return ERROR_OK;
		}

		gdb_put_packet(connection, buffer, strlen(buffer));
		free(buffer);

		return ERROR_OK;
	}
	else if (strstr(packet, "qXfer:memory-map:read::") && (flash_get_bank_count() > 0))
	{
		/* We get away with only specifying flash here. Regions that are not
		 * specified are treated as if we provided no memory map(if not we
		 * could detect the holes and mark them as RAM).
		 * Normally we only execute this code once, but no big deal if we
		 * have to regenerate it a couple of times. */

		struct flash_bank *p;
		char *xml = NULL;
		int size = 0;
		int pos = 0;
		int retval = ERROR_OK;

		int offset;
		int length;
		char *separator;
		int blocksize;

		/* skip command character */
		packet += 23;

		offset = strtoul(packet, &separator, 16);
		length = strtoul(separator + 1, &separator, 16);

		xml_printf(&retval, &xml, &pos, &size, "<memory-map>\n");

		/*
		sort banks in ascending order, we need to make non-flash memory be ram(or rather
		read/write) by default for GDB.
		GDB does not have a concept of non-cacheable read/write memory.
		 */
		struct flash_bank **banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
		int i;

		for (i = 0; i < flash_get_bank_count(); i++)
		{
			p = get_flash_bank_by_num(i);
			if (p == NULL)
			{
				free(banks);
				retval = ERROR_FAIL;
				gdb_send_error(connection, retval);
				return retval;
			}
			banks[i]=p;
		}

		qsort(banks, flash_get_bank_count(), sizeof(struct flash_bank *), compare_bank);

		uint32_t ram_start = 0;
		for (i = 0; i < flash_get_bank_count(); i++)
		{
			p = banks[i];

			if (ram_start < p->base)
			{
				xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
					ram_start, p->base-ram_start);
			}

			/* if device has uneven sector sizes, eg. str7, lpc
			 * we pass the smallest sector size to gdb memory map */
			blocksize = gdb_calc_blocksize(p);

			xml_printf(&retval, &xml, &pos, &size, "<memory type=\"flash\" start=\"0x%x\" length=\"0x%x\">\n" \
				"<property name=\"blocksize\">0x%x</property>\n" \
				"</memory>\n", \
				p->base, p->size, blocksize);
			ram_start = p->base + p->size;
		}
		if (ram_start != 0)
		{
			xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
				ram_start, 0-ram_start);
		} else
		{
			/* a flash chip could be at the very end of the 32 bit address space, in which case
			ram_start will be precisely 0 */
		}

		free(banks);
		banks = NULL;

		xml_printf(&retval, &xml, &pos, &size, "</memory-map>\n");

		if (retval != ERROR_OK)
		{
			gdb_send_error(connection, retval);
			return retval;
		}

		if (offset + length > pos)
		{
			length = pos - offset;
		}

		char *t = malloc(length + 1);
		t[0] = 'l';
		memcpy(t + 1, xml + offset, length);
		gdb_put_packet(connection, t, length + 1);

		free(t);
		free(xml);
		return ERROR_OK;
	}
	else if (strstr(packet, "qXfer:features:read:"))
	{
		char *xml = NULL;
		int size = 0;
		int pos = 0;
		int retval = ERROR_OK;

		int offset;
		unsigned int length;
		char *annex;

		/* skip command character */
		packet += 20;

		if (decode_xfer_read(packet, &annex, &offset, &length) < 0)
		{
			gdb_send_error(connection, 01);
			return ERROR_OK;
		}

		if (strcmp(annex, "target.xml") != 0)
		{
			gdb_send_error(connection, 01);
			return ERROR_OK;
		}

		xml_printf(&retval, &xml, &pos, &size, \
			"l < target version=\"1.0\">\n < architecture > arm</architecture>\n</target>\n");

		if (retval != ERROR_OK)
		{
			gdb_send_error(connection, retval);
			return retval;
		}

		gdb_put_packet(connection, xml, strlen(xml));

		free(xml);
		return ERROR_OK;
	}
	else if (strstr(packet, "QStartNoAckMode"))
	{
		gdb_connection->noack_mode = 1;
		gdb_put_packet(connection, "OK", 2);
		return ERROR_OK;
	}

	gdb_put_packet(connection, "", 0);
	return ERROR_OK;
}

int gdb_v_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
{
	struct gdb_connection *gdb_connection = connection->priv;
	struct gdb_service *gdb_service = connection->service->priv;
	int result;

	/* if flash programming disabled - send a empty reply */

	if (gdb_flash_program == 0)
	{
		gdb_put_packet(connection, "", 0);
		return ERROR_OK;
	}

	if (strstr(packet, "vFlashErase:"))
	{
		unsigned long addr;
		unsigned long length;

		char *parse = packet + 12;
		if (*parse == '\0')
		{
			LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
			return ERROR_SERVER_REMOTE_CLOSED;
		}

		addr = strtoul(parse, &parse, 16);

		if (*(parse++) != ',' || *parse == '\0')
		{
			LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
			return ERROR_SERVER_REMOTE_CLOSED;
		}

		length = strtoul(parse, &parse, 16);

		if (*parse != '\0')
		{
			LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
			return ERROR_SERVER_REMOTE_CLOSED;
		}

		/* assume all sectors need erasing - stops any problems
		 * when flash_write is called multiple times */
		flash_set_dirty();

		/* perform any target specific operations before the erase */
		target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_ERASE_START);
		result = flash_erase_address_range(gdb_service->target, addr, length);
		target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_ERASE_END);

		/* perform erase */
		if (result != ERROR_OK)
		{
			/* GDB doesn't evaluate the actual error number returned,
			 * treat a failed erase as an I/O error
			 */
			gdb_send_error(connection, EIO);
			LOG_ERROR("flash_erase returned %i", result);
		}
		else
			gdb_put_packet(connection, "OK", 2);

		return ERROR_OK;
	}

	if (strstr(packet, "vFlashWrite:"))
	{
		int retval;
		unsigned long addr;
		unsigned long length;
		char *parse = packet + 12;

		if (*parse == '\0')
		{
			LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
			return ERROR_SERVER_REMOTE_CLOSED;
		}
		addr = strtoul(parse, &parse, 16);
		if (*(parse++) != ':')
		{
			LOG_ERROR("incomplete vFlashErase packet received, dropping connection");
			return ERROR_SERVER_REMOTE_CLOSED;
		}
		length = packet_size - (parse - packet);

		/* create a new image if there isn't already one */
		if (gdb_connection->vflash_image == NULL)
		{
			gdb_connection->vflash_image = malloc(sizeof(struct image));
			image_open(gdb_connection->vflash_image, "", "build");
		}

		/* create new section with content from packet buffer */
		if ((retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (uint8_t*)parse)) != ERROR_OK)
		{
			return retval;
		}

		gdb_put_packet(connection, "OK", 2);

		return ERROR_OK;
	}

	if (!strcmp(packet, "vFlashDone"))
	{
		uint32_t written;

		/* process the flashing buffer. No need to erase as GDB
		 * always issues a vFlashErase first. */
		target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_START);
		result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
		target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
		if (result != ERROR_OK)
		{
			if (result == ERROR_FLASH_DST_OUT_OF_BANK)
				gdb_put_packet(connection, "E.memtype", 9);
			else
				gdb_send_error(connection, EIO);
			}
		else
		{
			LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
			gdb_put_packet(connection, "OK", 2);
		}

		image_close(gdb_connection->vflash_image);
		free(gdb_connection->vflash_image);
		gdb_connection->vflash_image = NULL;

		return ERROR_OK;
	}

	gdb_put_packet(connection, "", 0);
	return ERROR_OK;
}

int gdb_detach(struct connection *connection, struct target *target)
{
	struct gdb_service *gdb_service = connection->service->priv;

	target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);

	return gdb_put_packet(connection, "OK", 2);
}

static void gdb_log_callback(void *priv, const char *file, unsigned line,
		const char *function, const char *string)
{
	struct connection *connection = priv;
	struct gdb_connection *gdb_con = connection->priv;

	if (gdb_con->busy)
	{
		/* do not reply this using the O packet */
		return;
	}

	gdb_output_con(connection, string);
}

/* Do not allocate this on the stack */
char gdb_packet_buffer[GDB_BUFFER_SIZE];

static void gdb_sig_halted(struct connection *connection)
{
	char sig_reply[4];
	snprintf(sig_reply, 4, "T%2.2x", 2);
	gdb_put_packet(connection, sig_reply, 3);

}

int gdb_input_inner(struct connection *connection)
{
	struct gdb_service *gdb_service = connection->service->priv;
	struct target *target = gdb_service->target;
	char *packet = gdb_packet_buffer;
	int packet_size;
	int retval;
	struct gdb_connection *gdb_con = connection->priv;
	static int extended_protocol = 0;

	/* drain input buffer */
	do
	{
		packet_size = GDB_BUFFER_SIZE-1;
		if ((retval = gdb_get_packet(connection, packet, &packet_size)) != ERROR_OK)
		{
			return retval;
		}

		/* terminate with zero */
		packet[packet_size] = 0;

		if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
			if (packet[0] == 'X') {
				// binary packets spew junk into the debug log stream
				char buf[ 50 ];
				int x;
				for (x = 0 ; (x < 49) && (packet[x] != ':') ; x++) {
					buf[x] = packet[x];
				}
				buf[x] = 0;
				LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
			} else {
				LOG_DEBUG("received packet: '%s'", packet);
			}
		}

		if (packet_size > 0)
		{
			retval = ERROR_OK;
			switch (packet[0])
			{
				case 'H':
					/* Hct... -- set thread
					 * we don't have threads, send empty reply */
					gdb_put_packet(connection, NULL, 0);
					break;
				case 'q':
				case 'Q':
					retval = gdb_query_packet(connection, target, packet, packet_size);
					break;
				case 'g':
					retval = gdb_get_registers_packet(connection, target, packet, packet_size);
					break;
				case 'G':
					retval = gdb_set_registers_packet(connection, target, packet, packet_size);
					break;
				case 'p':
					retval = gdb_get_register_packet(connection, target, packet, packet_size);
					break;
				case 'P':
					retval = gdb_set_register_packet(connection, target, packet, packet_size);
					break;
				case 'm':
					retval = gdb_read_memory_packet(connection, target, packet, packet_size);
					break;
				case 'M':
					retval = gdb_write_memory_packet(connection, target, packet, packet_size);
					break;
				case 'z':
				case 'Z':
					retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
					break;
				case '?':
					gdb_last_signal_packet(connection, target, packet, packet_size);
					break;
				case 'c':
				case 's':
					{
						int retval = ERROR_OK;

						struct gdb_connection *gdb_con = connection->priv;
						log_add_callback(gdb_log_callback, connection);

						bool nostep = false;
						if (target->state == TARGET_RUNNING)
						{
							LOG_WARNING("The target is already running. Halt target before stepi/continue.");
							retval = target_halt(target);
							if (retval == ERROR_OK)
								retval = target_wait_state(target, TARGET_HALTED, 100);
						} else if (target->state != TARGET_HALTED)
						{
							LOG_WARNING("The target is not in the halted nor running stated, stepi/continue ignored.");
							nostep = true;
						} else if ((packet[0] == 's') && gdb_con->sync)
						{
							/* Hmm..... when you issue a continue in GDB, then a "stepi" is
							 * sent by GDB first to OpenOCD, thus defeating the check to
							 * make only the single stepping have the sync feature...
							 */
							nostep = true;
							LOG_WARNING("stepi ignored. GDB will now fetch the register state from the target.");
						}
						gdb_con->sync = false;

						if ((retval!=ERROR_OK) || nostep)
						{
							/* Either the target isn't in the halted state, then we can't
							 * step/continue. This might be early setup, etc.
							 *
							 * Or we want to allow GDB to pick up a fresh set of
							 * register values without modifying the target state.
							 *
							 */
							gdb_sig_halted(connection);

							/* stop forwarding log packets! */
							log_remove_callback(gdb_log_callback, connection);
						} else
						{
							/* We're running/stepping, in which case we can
							 * forward log output until the target is halted
							 */
							gdb_con->frontend_state = TARGET_RUNNING;
							target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
							int retval = gdb_step_continue_packet(connection, target, packet, packet_size);
							if (retval != ERROR_OK)
							{
								/* we'll never receive a halted condition... issue a false one.. */
								gdb_frontend_halted(target, connection);
							}
						}
					}
					break;
				case 'v':
					retval = gdb_v_packet(connection, target, packet, packet_size);
					break;
				case 'D':
					retval = gdb_detach(connection, target);
					extended_protocol = 0;
					break;
				case 'X':
					if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK)
						return retval;
					break;
				case 'k':
					if (extended_protocol != 0)
						break;
					gdb_put_packet(connection, "OK", 2);
					return ERROR_SERVER_REMOTE_CLOSED;
				case '!':
					/* handle extended remote protocol */
					extended_protocol = 1;
					gdb_put_packet(connection, "OK", 2);
					break;
				case 'R':
					/* handle extended restart packet */
					breakpoint_clear_target(gdb_service->target);
					watchpoint_clear_target(gdb_service->target);
					command_run_linef(connection->cmd_ctx,
							"ocd_gdb_restart %s",
							target->cmd_name);
					break;
				default:
					/* ignore unkown packets */
					LOG_DEBUG("ignoring 0x%2.2x packet", packet[0]);
					gdb_put_packet(connection, NULL, 0);
					break;
			}

			/* if a packet handler returned an error, exit input loop */
			if (retval != ERROR_OK)
				return retval;
		}

		if (gdb_con->ctrl_c)
		{
			if (target->state == TARGET_RUNNING)
			{
				retval = target_halt(target);
				if (retval != ERROR_OK)
				{
					target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
				}
				gdb_con->ctrl_c = 0;
			} else
			{
				LOG_INFO("The target is not running when halt was requested, stopping GDB.");
				target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
			}
		}

	} while (gdb_con->buf_cnt > 0);

	return ERROR_OK;
}

int gdb_input(struct connection *connection)
{
	int retval = gdb_input_inner(connection);
	struct gdb_connection *gdb_con = connection->priv;
	if (retval == ERROR_SERVER_REMOTE_CLOSED)
		return retval;

	/* logging does not propagate the error, yet can set the gdb_con->closed flag */
	if (gdb_con->closed)
		return ERROR_SERVER_REMOTE_CLOSED;

	/* we'll recover from any other errors(e.g. temporary timeouts, etc.) */
	return ERROR_OK;
}

int gdb_init(void)
{
	struct gdb_service *gdb_service;
	struct target *target = all_targets;

	if (!target)
	{
		LOG_WARNING("no gdb ports allocated as no target has been specified");
		return ERROR_OK;
	}

	if (gdb_port == 0 && server_use_pipes == 0)
	{
		LOG_INFO("gdb port disabled");
		return ERROR_OK;
	}

	if (server_use_pipes)
	{
		/* only a single gdb connection when using a pipe */

		gdb_service = malloc(sizeof(struct gdb_service));
		gdb_service->target = target;

		add_service("gdb", CONNECTION_PIPE, 0, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service);

		LOG_DEBUG("gdb service for target %s using pipes",
				target_get_name(target));
	}
	else
	{
		unsigned short port = gdb_port;

		while (target)
		{
			gdb_service = malloc(sizeof(struct gdb_service));
			gdb_service->target = target;

			add_service("gdb", CONNECTION_TCP,
					port, 1,
					gdb_new_connection, gdb_input,
					gdb_connection_closed, gdb_service);

			LOG_DEBUG("gdb service for target %s at TCP port %i",
					target_get_name(target),
					port);
			target = target->next;
			port++;
		}
	}

	return ERROR_OK;
}

COMMAND_HANDLER(handle_gdb_sync_command)
{
	if (CMD_ARGC != 0)
	{
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	if (current_gdb_connection == NULL)
	{
		command_print(CMD_CTX,
				"gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
		return ERROR_FAIL;
	}

	current_gdb_connection->sync = true;

	return ERROR_OK;
}

/* daemon configuration command gdb_port */
COMMAND_HANDLER(handle_gdb_port_command)
{
	return CALL_COMMAND_HANDLER(server_port_command, &gdb_port);
}

COMMAND_HANDLER(handle_gdb_memory_map_command)
{
	if (CMD_ARGC == 1)
		COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_use_memory_map);

	return ERROR_COMMAND_SYNTAX_ERROR;
}

COMMAND_HANDLER(handle_gdb_flash_program_command)
{
	if (CMD_ARGC == 1)
		COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_flash_program);

	return ERROR_COMMAND_SYNTAX_ERROR;
}

COMMAND_HANDLER(handle_gdb_report_data_abort_command)
{
	if (CMD_ARGC == 1)
		COMMAND_PARSE_ENABLE(CMD_ARGV[0], gdb_report_data_abort);

	return ERROR_COMMAND_SYNTAX_ERROR;
}

/* gdb_breakpoint_override */
COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
{
	if (CMD_ARGC == 0)
	{

	} else if (CMD_ARGC == 1)
	{
		gdb_breakpoint_override = 1;
		if (strcmp(CMD_ARGV[0], "hard") == 0)
		{
			gdb_breakpoint_override_type = BKPT_HARD;
		} else if (strcmp(CMD_ARGV[0], "soft") == 0)
		{
			gdb_breakpoint_override_type = BKPT_SOFT;
		} else if (strcmp(CMD_ARGV[0], "disable") == 0)
		{
			gdb_breakpoint_override = 0;
		}
	} else
	{
		return ERROR_COMMAND_SYNTAX_ERROR;
	}
	if (gdb_breakpoint_override)
	{
		LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type == BKPT_HARD)?"hard":"soft");
	} else
	{
		LOG_USER("breakpoint type is not overriden");
	}

	return ERROR_OK;
}

int gdb_register_commands(struct command_context *command_context)
{
	register_command(command_context, NULL, "gdb_sync",
			handle_gdb_sync_command, COMMAND_ANY,
			"next stepi will return immediately allowing GDB to "
			"fetch register state without affecting target state");
	register_command(command_context, NULL, "gdb_port",
			handle_gdb_port_command, COMMAND_ANY,
			"daemon configuration command gdb_port");
	register_command(command_context, NULL, "gdb_memory_map",
			handle_gdb_memory_map_command, COMMAND_CONFIG,
			"enable or disable memory map");
	register_command(command_context, NULL, "gdb_flash_program",
			handle_gdb_flash_program_command, COMMAND_CONFIG,
			"enable or disable flash program");
	register_command(command_context, NULL, "gdb_report_data_abort",
			handle_gdb_report_data_abort_command, COMMAND_CONFIG,
			"enable or disable reporting data aborts");
	register_command(command_context, NULL, "gdb_breakpoint_override",
			handle_gdb_breakpoint_override_command, COMMAND_EXEC,
			"hard/soft/disable - force type of breakpoint "
			"used by gdb 'break' commands.");
	return ERROR_OK;
}