aboutsummaryrefslogtreecommitdiff
path: root/gdb/monitor.c
blob: 850c2739064d3e7f58e544052fd281e9772851d0 (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
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
/* Remote debugging interface for boot monitors, for GDB.

   Copyright (C) 1990-2002, 2006-2012 Free Software Foundation, Inc.

   Contributed by Cygnus Support.  Written by Rob Savoye for Cygnus.
   Resurrected from the ashes by Stu Grossman.

   This file is part of GDB.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

/* This file was derived from various remote-* modules.  It is a collection
   of generic support functions so GDB can talk directly to a ROM based
   monitor.  This saves use from having to hack an exception based handler
   into existence, and makes for quick porting.

   This module talks to a debug monitor called 'MONITOR', which
   We communicate with MONITOR via either a direct serial line, or a TCP
   (or possibly TELNET) stream to a terminal multiplexor,
   which in turn talks to the target board.  */

/* FIXME 32x64: This code assumes that registers and addresses are at
   most 32 bits long.  If they can be larger, you will need to declare
   values as LONGEST and use %llx or some such to print values when
   building commands to send to the monitor.  Since we don't know of
   any actual 64-bit targets with ROM monitors that use this code,
   it's not an issue right now.  -sts 4/18/96  */

#include "defs.h"
#include "gdbcore.h"
#include "target.h"
#include "exceptions.h"
#include <signal.h>
#include <ctype.h>
#include "gdb_string.h"
#include <sys/types.h>
#include "command.h"
#include "serial.h"
#include "monitor.h"
#include "gdbcmd.h"
#include "inferior.h"
#include "gdb_regex.h"
#include "srec.h"
#include "regcache.h"
#include "gdbthread.h"

static char *dev_name;
static struct target_ops *targ_ops;

static void monitor_interrupt_query (void);
static void monitor_interrupt_twice (int);
static void monitor_stop (ptid_t);
static void monitor_dump_regs (struct regcache *regcache);

#if 0
static int from_hex (int a);
#endif

static struct monitor_ops *current_monitor;

static int hashmark;		/* flag set by "set hash".  */

static int timeout = 30;

static int in_monitor_wait = 0;	/* Non-zero means we are in monitor_wait().  */

static void (*ofunc) ();	/* Old SIGINT signal handler.  */

static CORE_ADDR *breakaddr;

/* Descriptor for I/O to remote machine.  Initialize it to NULL so
   that monitor_open knows that we don't have a file open when the
   program starts.  */

static struct serial *monitor_desc = NULL;

/* Pointer to regexp pattern matching data.  */

static struct re_pattern_buffer register_pattern;
static char register_fastmap[256];

static struct re_pattern_buffer getmem_resp_delim_pattern;
static char getmem_resp_delim_fastmap[256];

static struct re_pattern_buffer setmem_resp_delim_pattern;
static char setmem_resp_delim_fastmap[256];

static struct re_pattern_buffer setreg_resp_delim_pattern;
static char setreg_resp_delim_fastmap[256];

static int dump_reg_flag;	/* Non-zero means do a dump_registers cmd when
				   monitor_wait wakes up.  */

static int first_time = 0;	/* Is this the first time we're
				   executing after gaving created the
				   child proccess?  */


/* This is the ptid we use while we're connected to a monitor.  Its
   value is arbitrary, as monitor targets don't have a notion of
   processes or threads, but we need something non-null to place in
   inferior_ptid.  */
static ptid_t monitor_ptid;

#define TARGET_BUF_SIZE 2048

/* Monitor specific debugging information.  Typically only useful to
   the developer of a new monitor interface.  */

static void monitor_debug (const char *fmt, ...) ATTRIBUTE_PRINTF (1, 2);

static unsigned int monitor_debug_p = 0;

/* NOTE: This file alternates between monitor_debug_p and remote_debug
   when determining if debug information is printed.  Perhaps this
   could be simplified.  */

static void
monitor_debug (const char *fmt, ...)
{
  if (monitor_debug_p)
    {
      va_list args;

      va_start (args, fmt);
      vfprintf_filtered (gdb_stdlog, fmt, args);
      va_end (args);
    }
}


/* Convert a string into a printable representation, Return # byte in
   the new string.  When LEN is >0 it specifies the size of the
   string.  Otherwize strlen(oldstr) is used.  */

static void
monitor_printable_string (char *newstr, char *oldstr, int len)
{
  int ch;
  int i;

  if (len <= 0)
    len = strlen (oldstr);

  for (i = 0; i < len; i++)
    {
      ch = oldstr[i];
      switch (ch)
	{
	default:
	  if (isprint (ch))
	    *newstr++ = ch;

	  else
	    {
	      sprintf (newstr, "\\x%02x", ch & 0xff);
	      newstr += 4;
	    }
	  break;

	case '\\':
	  *newstr++ = '\\';
	  *newstr++ = '\\';
	  break;
	case '\b':
	  *newstr++ = '\\';
	  *newstr++ = 'b';
	  break;
	case '\f':
	  *newstr++ = '\\';
	  *newstr++ = 't';
	  break;
	case '\n':
	  *newstr++ = '\\';
	  *newstr++ = 'n';
	  break;
	case '\r':
	  *newstr++ = '\\';
	  *newstr++ = 'r';
	  break;
	case '\t':
	  *newstr++ = '\\';
	  *newstr++ = 't';
	  break;
	case '\v':
	  *newstr++ = '\\';
	  *newstr++ = 'v';
	  break;
	}
    }

  *newstr++ = '\0';
}

/* Print monitor errors with a string, converting the string to printable
   representation.  */

static void
monitor_error (char *function, char *message,
	       CORE_ADDR memaddr, int len, char *string, int final_char)
{
  int real_len = (len == 0 && string != (char *) 0) ? strlen (string) : len;
  char *safe_string = alloca ((real_len * 4) + 1);

  monitor_printable_string (safe_string, string, real_len);

  if (final_char)
    error (_("%s (%s): %s: %s%c"),
	   function, paddress (target_gdbarch (), memaddr),
	   message, safe_string, final_char);
  else
    error (_("%s (%s): %s: %s"),
	   function, paddress (target_gdbarch (), memaddr),
	   message, safe_string);
}

/* Convert hex digit A to a number.  */

static int
fromhex (int a)
{
  if (a >= '0' && a <= '9')
    return a - '0';
  else if (a >= 'a' && a <= 'f')
    return a - 'a' + 10;
  else if (a >= 'A' && a <= 'F')
    return a - 'A' + 10;
  else
    error (_("Invalid hex digit %d"), a);
}

/* monitor_vsprintf - similar to vsprintf but handles 64-bit addresses

   This function exists to get around the problem that many host platforms
   don't have a printf that can print 64-bit addresses.  The %A format
   specification is recognized as a special case, and causes the argument
   to be printed as a 64-bit hexadecimal address.

   Only format specifiers of the form "[0-9]*[a-z]" are recognized.
   If it is a '%s' format, the argument is a string; otherwise the
   argument is assumed to be a long integer.

   %% is also turned into a single %.  */

static void
monitor_vsprintf (char *sndbuf, char *pattern, va_list args)
{
  int addr_bit = gdbarch_addr_bit (target_gdbarch ());
  char format[10];
  char fmt;
  char *p;
  int i;
  long arg_int;
  CORE_ADDR arg_addr;
  char *arg_string;

  for (p = pattern; *p; p++)
    {
      if (*p == '%')
	{
	  /* Copy the format specifier to a separate buffer.  */
	  format[0] = *p++;
	  for (i = 1; *p >= '0' && *p <= '9' && i < (int) sizeof (format) - 2;
	       i++, p++)
	    format[i] = *p;
	  format[i] = fmt = *p;
	  format[i + 1] = '\0';

	  /* Fetch the next argument and print it.  */
	  switch (fmt)
	    {
	    case '%':
	      strcpy (sndbuf, "%");
	      break;
	    case 'A':
	      arg_addr = va_arg (args, CORE_ADDR);
	      strcpy (sndbuf, phex_nz (arg_addr, addr_bit / 8));
	      break;
	    case 's':
	      arg_string = va_arg (args, char *);
	      sprintf (sndbuf, format, arg_string);
	      break;
	    default:
	      arg_int = va_arg (args, long);
	      sprintf (sndbuf, format, arg_int);
	      break;
	    }
	  sndbuf += strlen (sndbuf);
	}
      else
	*sndbuf++ = *p;
    }
  *sndbuf = '\0';
}


/* monitor_printf_noecho -- Send data to monitor, but don't expect an echo.
   Works just like printf.  */

void
monitor_printf_noecho (char *pattern,...)
{
  va_list args;
  char sndbuf[2000];
  int len;

  va_start (args, pattern);

  monitor_vsprintf (sndbuf, pattern, args);

  len = strlen (sndbuf);
  if (len + 1 > sizeof sndbuf)
    internal_error (__FILE__, __LINE__,
		    _("failed internal consistency check"));

  if (monitor_debug_p)
    {
      char *safe_string = (char *) alloca ((strlen (sndbuf) * 4) + 1);

      monitor_printable_string (safe_string, sndbuf, 0);
      fprintf_unfiltered (gdb_stdlog, "sent[%s]\n", safe_string);
    }

  monitor_write (sndbuf, len);
}

/* monitor_printf -- Send data to monitor and check the echo.  Works just like
   printf.  */

void
monitor_printf (char *pattern,...)
{
  va_list args;
  char sndbuf[2000];
  int len;

  va_start (args, pattern);

  monitor_vsprintf (sndbuf, pattern, args);

  len = strlen (sndbuf);
  if (len + 1 > sizeof sndbuf)
    internal_error (__FILE__, __LINE__,
		    _("failed internal consistency check"));

  if (monitor_debug_p)
    {
      char *safe_string = (char *) alloca ((len * 4) + 1);

      monitor_printable_string (safe_string, sndbuf, 0);
      fprintf_unfiltered (gdb_stdlog, "sent[%s]\n", safe_string);
    }

  monitor_write (sndbuf, len);

  /* We used to expect that the next immediate output was the
     characters we just output, but sometimes some extra junk appeared
     before the characters we expected, like an extra prompt, or a
     portmaster sending telnet negotiations.  So, just start searching
     for what we sent, and skip anything unknown.  */
  monitor_debug ("ExpectEcho\n");
  monitor_expect (sndbuf, (char *) 0, 0);
}


/* Write characters to the remote system.  */

void
monitor_write (char *buf, int buflen)
{
  if (serial_write (monitor_desc, buf, buflen))
    fprintf_unfiltered (gdb_stderr, "serial_write failed: %s\n",
			safe_strerror (errno));
}


/* Read a binary character from the remote system, doing all the fancy
   timeout stuff, but without interpreting the character in any way,
   and without printing remote debug information.  */

int
monitor_readchar (void)
{
  int c;
  int looping;

  do
    {
      looping = 0;
      c = serial_readchar (monitor_desc, timeout);

      if (c >= 0)
	c &= 0xff;		/* don't lose bit 7 */
    }
  while (looping);

  if (c >= 0)
    return c;

  if (c == SERIAL_TIMEOUT)
    error (_("Timeout reading from remote system."));

  perror_with_name (_("remote-monitor"));
}


/* Read a character from the remote system, doing all the fancy
   timeout stuff.  */

static int
readchar (int timeout)
{
  int c;
  static enum
    {
      last_random, last_nl, last_cr, last_crnl
    }
  state = last_random;
  int looping;

  do
    {
      looping = 0;
      c = serial_readchar (monitor_desc, timeout);

      if (c >= 0)
	{
	  c &= 0x7f;
	  /* This seems to interfere with proper function of the
	     input stream.  */
	  if (monitor_debug_p || remote_debug)
	    {
	      char buf[2];

	      buf[0] = c;
	      buf[1] = '\0';
	      puts_debug ("read -->", buf, "<--");
	    }

	}

      /* Canonicialize \n\r combinations into one \r.  */
      if ((current_monitor->flags & MO_HANDLE_NL) != 0)
	{
	  if ((c == '\r' && state == last_nl)
	      || (c == '\n' && state == last_cr))
	    {
	      state = last_crnl;
	      looping = 1;
	    }
	  else if (c == '\r')
	    state = last_cr;
	  else if (c != '\n')
	    state = last_random;
	  else
	    {
	      state = last_nl;
	      c = '\r';
	    }
	}
    }
  while (looping);

  if (c >= 0)
    return c;

  if (c == SERIAL_TIMEOUT)
#if 0
    /* I fail to see how detaching here can be useful.  */
    if (in_monitor_wait)	/* Watchdog went off.  */
      {
	target_mourn_inferior ();
	error (_("GDB serial timeout has expired.  Target detached."));
      }
    else
#endif
      error (_("Timeout reading from remote system."));

  perror_with_name (_("remote-monitor"));
}

/* Scan input from the remote system, until STRING is found.  If BUF is non-
   zero, then collect input until we have collected either STRING or BUFLEN-1
   chars.  In either case we terminate BUF with a 0.  If input overflows BUF
   because STRING can't be found, return -1, else return number of chars in BUF
   (minus the terminating NUL).  Note that in the non-overflow case, STRING
   will be at the end of BUF.  */

int
monitor_expect (char *string, char *buf, int buflen)
{
  char *p = string;
  int obuflen = buflen;
  int c;

  if (monitor_debug_p)
    {
      char *safe_string = (char *) alloca ((strlen (string) * 4) + 1);
      monitor_printable_string (safe_string, string, 0);
      fprintf_unfiltered (gdb_stdlog, "MON Expecting '%s'\n", safe_string);
    }

  immediate_quit++;
  QUIT;
  while (1)
    {
      if (buf)
	{
	  if (buflen < 2)
	    {
	      *buf = '\000';
	      immediate_quit--;
	      return -1;
	    }

	  c = readchar (timeout);
	  if (c == '\000')
	    continue;
	  *buf++ = c;
	  buflen--;
	}
      else
	c = readchar (timeout);

      /* Don't expect any ^C sent to be echoed.  */

      if (*p == '\003' || c == *p)
	{
	  p++;
	  if (*p == '\0')
	    {
	      immediate_quit--;

	      if (buf)
		{
		  *buf++ = '\000';
		  return obuflen - buflen;
		}
	      else
		return 0;
	    }
	}
      else
	{
	  /* We got a character that doesn't match the string.  We need to
	     back up p, but how far?  If we're looking for "..howdy" and the
	     monitor sends "...howdy"?  There's certainly a match in there,
	     but when we receive the third ".", we won't find it if we just
	     restart the matching at the beginning of the string.

	     This is a Boyer-Moore kind of situation.  We want to reset P to
	     the end of the longest prefix of STRING that is a suffix of
	     what we've read so far.  In the example above, that would be
	     ".." --- the longest prefix of "..howdy" that is a suffix of
	     "...".  This longest prefix could be the empty string, if C
	     is nowhere to be found in STRING.

	     If this longest prefix is not the empty string, it must contain
	     C, so let's search from the end of STRING for instances of C,
	     and see if the portion of STRING before that is a suffix of
	     what we read before C.  Actually, we can search backwards from
	     p, since we know no prefix can be longer than that.

	     Note that we can use STRING itself, along with C, as a record
	     of what we've received so far.  :)  */
	  int i;

	  for (i = (p - string) - 1; i >= 0; i--)
	    if (string[i] == c)
	      {
		/* Is this prefix a suffix of what we've read so far?
		   In other words, does
                     string[0 .. i-1] == string[p - i, p - 1]?  */
		if (! memcmp (string, p - i, i))
		  {
		    p = string + i + 1;
		    break;
		  }
	      }
	  if (i < 0)
	    p = string;
	}
    }
}

/* Search for a regexp.  */

static int
monitor_expect_regexp (struct re_pattern_buffer *pat, char *buf, int buflen)
{
  char *mybuf;
  char *p;

  monitor_debug ("MON Expecting regexp\n");
  if (buf)
    mybuf = buf;
  else
    {
      mybuf = alloca (TARGET_BUF_SIZE);
      buflen = TARGET_BUF_SIZE;
    }

  p = mybuf;
  while (1)
    {
      int retval;

      if (p - mybuf >= buflen)
	{			/* Buffer about to overflow.  */

/* On overflow, we copy the upper half of the buffer to the lower half.  Not
   great, but it usually works...  */

	  memcpy (mybuf, mybuf + buflen / 2, buflen / 2);
	  p = mybuf + buflen / 2;
	}

      *p++ = readchar (timeout);

      retval = re_search (pat, mybuf, p - mybuf, 0, p - mybuf, NULL);
      if (retval >= 0)
	return 1;
    }
}

/* Keep discarding input until we see the MONITOR prompt.

   The convention for dealing with the prompt is that you
   o give your command
   o *then* wait for the prompt.

   Thus the last thing that a procedure does with the serial line will
   be an monitor_expect_prompt().  Exception: monitor_resume does not
   wait for the prompt, because the terminal is being handed over to
   the inferior.  However, the next thing which happens after that is
   a monitor_wait which does wait for the prompt.  Note that this
   includes abnormal exit, e.g. error().  This is necessary to prevent
   getting into states from which we can't recover.  */

int
monitor_expect_prompt (char *buf, int buflen)
{
  monitor_debug ("MON Expecting prompt\n");
  return monitor_expect (current_monitor->prompt, buf, buflen);
}

/* Get N 32-bit words from remote, each preceded by a space, and put
   them in registers starting at REGNO.  */

#if 0
static unsigned long
get_hex_word (void)
{
  unsigned long val;
  int i;
  int ch;

  do
    ch = readchar (timeout);
  while (isspace (ch));

  val = from_hex (ch);

  for (i = 7; i >= 1; i--)
    {
      ch = readchar (timeout);
      if (!isxdigit (ch))
	break;
      val = (val << 4) | from_hex (ch);
    }

  return val;
}
#endif

static void
compile_pattern (char *pattern, struct re_pattern_buffer *compiled_pattern,
		 char *fastmap)
{
  int tmp;
  const char *val;

  compiled_pattern->fastmap = fastmap;

  tmp = re_set_syntax (RE_SYNTAX_EMACS);
  val = re_compile_pattern (pattern,
			    strlen (pattern),
			    compiled_pattern);
  re_set_syntax (tmp);

  if (val)
    error (_("compile_pattern: Can't compile pattern string `%s': %s!"),
	   pattern, val);

  if (fastmap)
    re_compile_fastmap (compiled_pattern);
}

/* Open a connection to a remote debugger.  NAME is the filename used
   for communication.  */

void
monitor_open (char *args, struct monitor_ops *mon_ops, int from_tty)
{
  char *name;
  char **p;
  struct inferior *inf;

  if (mon_ops->magic != MONITOR_OPS_MAGIC)
    error (_("Magic number of monitor_ops struct wrong."));

  targ_ops = mon_ops->target;
  name = targ_ops->to_shortname;

  if (!args)
    error (_("Use `target %s DEVICE-NAME' to use a serial port, or\n\
`target %s HOST-NAME:PORT-NUMBER' to use a network connection."), name, name);

  target_preopen (from_tty);

  /* Setup pattern for register dump.  */

  if (mon_ops->register_pattern)
    compile_pattern (mon_ops->register_pattern, &register_pattern,
		     register_fastmap);

  if (mon_ops->getmem.resp_delim)
    compile_pattern (mon_ops->getmem.resp_delim, &getmem_resp_delim_pattern,
		     getmem_resp_delim_fastmap);

  if (mon_ops->setmem.resp_delim)
    compile_pattern (mon_ops->setmem.resp_delim, &setmem_resp_delim_pattern,
                     setmem_resp_delim_fastmap);

  if (mon_ops->setreg.resp_delim)
    compile_pattern (mon_ops->setreg.resp_delim, &setreg_resp_delim_pattern,
                     setreg_resp_delim_fastmap);
  
  unpush_target (targ_ops);

  if (dev_name)
    xfree (dev_name);
  dev_name = xstrdup (args);

  monitor_desc = serial_open (dev_name);

  if (!monitor_desc)
    perror_with_name (dev_name);

  if (baud_rate != -1)
    {
      if (serial_setbaudrate (monitor_desc, baud_rate))
	{
	  serial_close (monitor_desc);
	  perror_with_name (dev_name);
	}
    }

  serial_raw (monitor_desc);

  serial_flush_input (monitor_desc);

  /* some systems only work with 2 stop bits.  */

  serial_setstopbits (monitor_desc, mon_ops->stopbits);

  current_monitor = mon_ops;

  /* See if we can wake up the monitor.  First, try sending a stop sequence,
     then send the init strings.  Last, remove all breakpoints.  */

  if (current_monitor->stop)
    {
      monitor_stop (inferior_ptid);
      if ((current_monitor->flags & MO_NO_ECHO_ON_OPEN) == 0)
	{
	  monitor_debug ("EXP Open echo\n");
	  monitor_expect_prompt (NULL, 0);
	}
    }

  /* wake up the monitor and see if it's alive.  */
  for (p = mon_ops->init; *p != NULL; p++)
    {
      /* Some of the characters we send may not be echoed,
         but we hope to get a prompt at the end of it all.  */

      if ((current_monitor->flags & MO_NO_ECHO_ON_OPEN) == 0)
	monitor_printf (*p);
      else
	monitor_printf_noecho (*p);
      monitor_expect_prompt (NULL, 0);
    }

  serial_flush_input (monitor_desc);

  /* Alloc breakpoints */
  if (mon_ops->set_break != NULL)
    {
      if (mon_ops->num_breakpoints == 0)
	mon_ops->num_breakpoints = 8;

      breakaddr = (CORE_ADDR *)
	xmalloc (mon_ops->num_breakpoints * sizeof (CORE_ADDR));
      memset (breakaddr, 0, mon_ops->num_breakpoints * sizeof (CORE_ADDR));
    }

  /* Remove all breakpoints.  */

  if (mon_ops->clr_all_break)
    {
      monitor_printf (mon_ops->clr_all_break);
      monitor_expect_prompt (NULL, 0);
    }

  if (from_tty)
    printf_unfiltered (_("Remote target %s connected to %s\n"),
		       name, dev_name);

  push_target (targ_ops);

  /* Start afresh.  */
  init_thread_list ();

  /* Make run command think we are busy...  */
  inferior_ptid = monitor_ptid;
  inf = current_inferior ();
  inferior_appeared (inf, ptid_get_pid (inferior_ptid));
  add_thread_silent (inferior_ptid);

  /* Give monitor_wait something to read.  */

  monitor_printf (current_monitor->line_term);

  init_wait_for_inferior ();

  start_remote (from_tty);
}

/* Close out all files and local state before this target loses
   control.  */

void
monitor_close (int quitting)
{
  if (monitor_desc)
    serial_close (monitor_desc);

  /* Free breakpoint memory.  */
  if (breakaddr != NULL)
    {
      xfree (breakaddr);
      breakaddr = NULL;
    }

  monitor_desc = NULL;

  delete_thread_silent (monitor_ptid);
  delete_inferior_silent (ptid_get_pid (monitor_ptid));
}

/* Terminate the open connection to the remote debugger.  Use this
   when you want to detach and do something else with your gdb.  */

static void
monitor_detach (struct target_ops *ops, char *args, int from_tty)
{
  pop_target ();		/* calls monitor_close to do the real work.  */
  if (from_tty)
    printf_unfiltered (_("Ending remote %s debugging\n"), target_shortname);
}

/* Convert VALSTR into the target byte-ordered value of REGNO and store it.  */

char *
monitor_supply_register (struct regcache *regcache, int regno, char *valstr)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  ULONGEST val;
  unsigned char regbuf[MAX_REGISTER_SIZE];
  char *p;

  val = 0;
  p = valstr;
  while (p && *p != '\0')
    {
      if (*p == '\r' || *p == '\n')
        {
          while (*p != '\0') 
              p++;
          break;
        }
      if (isspace (*p))
        {
          p++;
          continue;
        }
      if (!isxdigit (*p) && *p != 'x')
        {
          break;
        }

      val <<= 4;
      val += fromhex (*p++);
    }
  monitor_debug ("Supplying Register %d %s\n", regno, valstr);

  if (val == 0 && valstr == p)
    error (_("monitor_supply_register (%d):  bad value from monitor: %s."),
	   regno, valstr);

  /* supply register stores in target byte order, so swap here.  */

  store_unsigned_integer (regbuf, register_size (gdbarch, regno), byte_order,
			  val);

  regcache_raw_supply (regcache, regno, regbuf);

  return p;
}

/* Tell the remote machine to resume.  */

static void
monitor_resume (struct target_ops *ops,
		ptid_t ptid, int step, enum gdb_signal sig)
{
  /* Some monitors require a different command when starting a program.  */
  monitor_debug ("MON resume\n");
  if (current_monitor->flags & MO_RUN_FIRST_TIME && first_time == 1)
    {
      first_time = 0;
      monitor_printf ("run\r");
      if (current_monitor->flags & MO_NEED_REGDUMP_AFTER_CONT)
	dump_reg_flag = 1;
      return;
    }
  if (step)
    monitor_printf (current_monitor->step);
  else
    {
      if (current_monitor->continue_hook)
	(*current_monitor->continue_hook) ();
      else
	monitor_printf (current_monitor->cont);
      if (current_monitor->flags & MO_NEED_REGDUMP_AFTER_CONT)
	dump_reg_flag = 1;
    }
}

/* Parse the output of a register dump command.  A monitor specific
   regexp is used to extract individual register descriptions of the
   form REG=VAL.  Each description is split up into a name and a value
   string which are passed down to monitor specific code.  */

static void
parse_register_dump (struct regcache *regcache, char *buf, int len)
{
  monitor_debug ("MON Parsing  register dump\n");
  while (1)
    {
      int regnamelen, vallen;
      char *regname, *val;

      /* Element 0 points to start of register name, and element 1
         points to the start of the register value.  */
      struct re_registers register_strings;

      memset (&register_strings, 0, sizeof (struct re_registers));

      if (re_search (&register_pattern, buf, len, 0, len,
		     &register_strings) == -1)
	break;

      regnamelen = register_strings.end[1] - register_strings.start[1];
      regname = buf + register_strings.start[1];
      vallen = register_strings.end[2] - register_strings.start[2];
      val = buf + register_strings.start[2];

      current_monitor->supply_register (regcache, regname, regnamelen,
					val, vallen);

      buf += register_strings.end[0];
      len -= register_strings.end[0];
    }
}

/* Send ^C to target to halt it.  Target will respond, and send us a
   packet.  */

static void
monitor_interrupt (int signo)
{
  /* If this doesn't work, try more severe steps.  */
  signal (signo, monitor_interrupt_twice);

  if (monitor_debug_p || remote_debug)
    fprintf_unfiltered (gdb_stdlog, "monitor_interrupt called\n");

  target_stop (inferior_ptid);
}

/* The user typed ^C twice.  */

static void
monitor_interrupt_twice (int signo)
{
  signal (signo, ofunc);

  monitor_interrupt_query ();

  signal (signo, monitor_interrupt);
}

/* Ask the user what to do when an interrupt is received.  */

static void
monitor_interrupt_query (void)
{
  target_terminal_ours ();

  if (query (_("Interrupted while waiting for the program.\n\
Give up (and stop debugging it)? ")))
    {
      target_mourn_inferior ();
      deprecated_throw_reason (RETURN_QUIT);
    }

  target_terminal_inferior ();
}

static void
monitor_wait_cleanup (void *old_timeout)
{
  timeout = *(int *) old_timeout;
  signal (SIGINT, ofunc);
  in_monitor_wait = 0;
}



static void
monitor_wait_filter (char *buf,
		     int bufmax,
		     int *ext_resp_len,
		     struct target_waitstatus *status)
{
  int resp_len;

  do
    {
      resp_len = monitor_expect_prompt (buf, bufmax);
      *ext_resp_len = resp_len;

      if (resp_len <= 0)
	fprintf_unfiltered (gdb_stderr,
			    "monitor_wait:  excessive "
			    "response from monitor: %s.", buf);
    }
  while (resp_len < 0);

  /* Print any output characters that were preceded by ^O.  */
  /* FIXME - This would be great as a user settabgle flag.  */
  if (monitor_debug_p || remote_debug
      || current_monitor->flags & MO_PRINT_PROGRAM_OUTPUT)
    {
      int i;

      for (i = 0; i < resp_len - 1; i++)
	if (buf[i] == 0x0f)
	  putchar_unfiltered (buf[++i]);
    }
}



/* Wait until the remote machine stops, then return, storing status in
   status just as `wait' would.  */

static ptid_t
monitor_wait (struct target_ops *ops,
	      ptid_t ptid, struct target_waitstatus *status, int options)
{
  int old_timeout = timeout;
  char buf[TARGET_BUF_SIZE];
  int resp_len;
  struct cleanup *old_chain;

  status->kind = TARGET_WAITKIND_EXITED;
  status->value.integer = 0;

  old_chain = make_cleanup (monitor_wait_cleanup, &old_timeout);
  monitor_debug ("MON wait\n");

#if 0
  /* This is somthing other than a maintenance command.  */
    in_monitor_wait = 1;
  timeout = watchdog > 0 ? watchdog : -1;
#else
  timeout = -1;		/* Don't time out -- user program is running.  */
#endif

  ofunc = (void (*)()) signal (SIGINT, monitor_interrupt);

  if (current_monitor->wait_filter)
    (*current_monitor->wait_filter) (buf, sizeof (buf), &resp_len, status);
  else
    monitor_wait_filter (buf, sizeof (buf), &resp_len, status);

#if 0				/* Transferred to monitor wait filter.  */
  do
    {
      resp_len = monitor_expect_prompt (buf, sizeof (buf));

      if (resp_len <= 0)
	fprintf_unfiltered (gdb_stderr,
			    "monitor_wait:  excessive "
			    "response from monitor: %s.", buf);
    }
  while (resp_len < 0);

  /* Print any output characters that were preceded by ^O.  */
  /* FIXME - This would be great as a user settabgle flag.  */
  if (monitor_debug_p || remote_debug
      || current_monitor->flags & MO_PRINT_PROGRAM_OUTPUT)
    {
      int i;

      for (i = 0; i < resp_len - 1; i++)
	if (buf[i] == 0x0f)
	  putchar_unfiltered (buf[++i]);
    }
#endif

  signal (SIGINT, ofunc);

  timeout = old_timeout;
#if 0
  if (dump_reg_flag && current_monitor->dump_registers)
    {
      dump_reg_flag = 0;
      monitor_printf (current_monitor->dump_registers);
      resp_len = monitor_expect_prompt (buf, sizeof (buf));
    }

  if (current_monitor->register_pattern)
    parse_register_dump (get_current_regcache (), buf, resp_len);
#else
  monitor_debug ("Wait fetching registers after stop\n");
  monitor_dump_regs (get_current_regcache ());
#endif

  status->kind = TARGET_WAITKIND_STOPPED;
  status->value.sig = GDB_SIGNAL_TRAP;

  discard_cleanups (old_chain);

  in_monitor_wait = 0;

  return inferior_ptid;
}

/* Fetch register REGNO, or all registers if REGNO is -1.  Returns
   errno value.  */

static void
monitor_fetch_register (struct regcache *regcache, int regno)
{
  const char *name;
  char *zerobuf;
  char *regbuf;
  int i;

  regbuf  = alloca (MAX_REGISTER_SIZE * 2 + 1);
  zerobuf = alloca (MAX_REGISTER_SIZE);
  memset (zerobuf, 0, MAX_REGISTER_SIZE);

  if (current_monitor->regname != NULL)
    name = current_monitor->regname (regno);
  else
    name = current_monitor->regnames[regno];
  monitor_debug ("MON fetchreg %d '%s'\n", regno, name ? name : "(null name)");

  if (!name || (*name == '\0'))
    {
      monitor_debug ("No register known for %d\n", regno);
      regcache_raw_supply (regcache, regno, zerobuf);
      return;
    }

  /* Send the register examine command.  */

  monitor_printf (current_monitor->getreg.cmd, name);

  /* If RESP_DELIM is specified, we search for that as a leading
     delimiter for the register value.  Otherwise, we just start
     searching from the start of the buf.  */

  if (current_monitor->getreg.resp_delim)
    {
      monitor_debug ("EXP getreg.resp_delim\n");
      monitor_expect (current_monitor->getreg.resp_delim, NULL, 0);
      /* Handle case of first 32 registers listed in pairs.  */
      if (current_monitor->flags & MO_32_REGS_PAIRED
	  && (regno & 1) != 0 && regno < 32)
	{
	  monitor_debug ("EXP getreg.resp_delim\n");
	  monitor_expect (current_monitor->getreg.resp_delim, NULL, 0);
	}
    }

  /* Skip leading spaces and "0x" if MO_HEX_PREFIX flag is set.  */
  if (current_monitor->flags & MO_HEX_PREFIX)
    {
      int c;

      c = readchar (timeout);
      while (c == ' ')
	c = readchar (timeout);
      if ((c == '0') && ((c = readchar (timeout)) == 'x'))
	;
      else
	error (_("Bad value returned from monitor "
		 "while fetching register %x."),
	       regno);
    }

  /* Read upto the maximum number of hex digits for this register, skipping
     spaces, but stop reading if something else is seen.  Some monitors
     like to drop leading zeros.  */

  for (i = 0; i < register_size (get_regcache_arch (regcache), regno) * 2; i++)
    {
      int c;

      c = readchar (timeout);
      while (c == ' ')
	c = readchar (timeout);

      if (!isxdigit (c))
	break;

      regbuf[i] = c;
    }

  regbuf[i] = '\000';		/* Terminate the number.  */
  monitor_debug ("REGVAL '%s'\n", regbuf);

  /* If TERM is present, we wait for that to show up.  Also, (if TERM
     is present), we will send TERM_CMD if that is present.  In any
     case, we collect all of the output into buf, and then wait for
     the normal prompt.  */

  if (current_monitor->getreg.term)
    {
      monitor_debug ("EXP getreg.term\n");
      monitor_expect (current_monitor->getreg.term, NULL, 0); /* Get
								 response.  */
    }

  if (current_monitor->getreg.term_cmd)
    {
      monitor_debug ("EMIT getreg.term.cmd\n");
      monitor_printf (current_monitor->getreg.term_cmd);
    }
  if (!current_monitor->getreg.term ||	/* Already expected or */
      current_monitor->getreg.term_cmd)		/* ack expected.  */
    monitor_expect_prompt (NULL, 0);	/* Get response.  */

  monitor_supply_register (regcache, regno, regbuf);
}

/* Sometimes, it takes several commands to dump the registers.  */
/* This is a primitive for use by variations of monitor interfaces in
   case they need to compose the operation.  */

int
monitor_dump_reg_block (struct regcache *regcache, char *block_cmd)
{
  char buf[TARGET_BUF_SIZE];
  int resp_len;

  monitor_printf (block_cmd);
  resp_len = monitor_expect_prompt (buf, sizeof (buf));
  parse_register_dump (regcache, buf, resp_len);
  return 1;
}


/* Read the remote registers into the block regs.  */
/* Call the specific function if it has been provided.  */

static void
monitor_dump_regs (struct regcache *regcache)
{
  char buf[TARGET_BUF_SIZE];
  int resp_len;

  if (current_monitor->dumpregs)
    (*(current_monitor->dumpregs)) (regcache);	/* Call supplied function.  */
  else if (current_monitor->dump_registers)	/* Default version.  */
    {
      monitor_printf (current_monitor->dump_registers);
      resp_len = monitor_expect_prompt (buf, sizeof (buf));
      parse_register_dump (regcache, buf, resp_len);
    }
  else
    /* Need some way to read registers.  */
    internal_error (__FILE__, __LINE__,
		    _("failed internal consistency check"));
}

static void
monitor_fetch_registers (struct target_ops *ops,
			 struct regcache *regcache, int regno)
{
  monitor_debug ("MON fetchregs\n");
  if (current_monitor->getreg.cmd)
    {
      if (regno >= 0)
	{
	  monitor_fetch_register (regcache, regno);
	  return;
	}

      for (regno = 0; regno < gdbarch_num_regs (get_regcache_arch (regcache));
	   regno++)
	monitor_fetch_register (regcache, regno);
    }
  else
    {
      monitor_dump_regs (regcache);
    }
}

/* Store register REGNO, or all if REGNO == 0.  Return errno value.  */

static void
monitor_store_register (struct regcache *regcache, int regno)
{
  int reg_size = register_size (get_regcache_arch (regcache), regno);
  const char *name;
  ULONGEST val;
  
  if (current_monitor->regname != NULL)
    name = current_monitor->regname (regno);
  else
    name = current_monitor->regnames[regno];
  
  if (!name || (*name == '\0'))
    {
      monitor_debug ("MON Cannot store unknown register\n");
      return;
    }

  regcache_cooked_read_unsigned (regcache, regno, &val);
  monitor_debug ("MON storeg %d %s\n", regno, phex (val, reg_size));

  /* Send the register deposit command.  */

  if (current_monitor->flags & MO_REGISTER_VALUE_FIRST)
    monitor_printf (current_monitor->setreg.cmd, val, name);
  else if (current_monitor->flags & MO_SETREG_INTERACTIVE)
    monitor_printf (current_monitor->setreg.cmd, name);
  else
    monitor_printf (current_monitor->setreg.cmd, name, val);

  if (current_monitor->setreg.resp_delim)
    {
      monitor_debug ("EXP setreg.resp_delim\n");
      monitor_expect_regexp (&setreg_resp_delim_pattern, NULL, 0);
      if (current_monitor->flags & MO_SETREG_INTERACTIVE)
	monitor_printf ("%s\r", phex_nz (val, reg_size));
    }
  if (current_monitor->setreg.term)
    {
      monitor_debug ("EXP setreg.term\n");
      monitor_expect (current_monitor->setreg.term, NULL, 0);
      if (current_monitor->flags & MO_SETREG_INTERACTIVE)
	monitor_printf ("%s\r", phex_nz (val, reg_size));
      monitor_expect_prompt (NULL, 0);
    }
  else
    monitor_expect_prompt (NULL, 0);
  if (current_monitor->setreg.term_cmd)		/* Mode exit required.  */
    {
      monitor_debug ("EXP setreg_termcmd\n");
      monitor_printf ("%s", current_monitor->setreg.term_cmd);
      monitor_expect_prompt (NULL, 0);
    }
}				/* monitor_store_register */

/* Store the remote registers.  */

static void
monitor_store_registers (struct target_ops *ops,
			 struct regcache *regcache, int regno)
{
  if (regno >= 0)
    {
      monitor_store_register (regcache, regno);
      return;
    }

  for (regno = 0; regno < gdbarch_num_regs (get_regcache_arch (regcache));
       regno++)
    monitor_store_register (regcache, regno);
}

/* Get ready to modify the registers array.  On machines which store
   individual registers, this doesn't need to do anything.  On machines
   which store all the registers in one fell swoop, this makes sure
   that registers contains all the registers from the program being
   debugged.  */

static void
monitor_prepare_to_store (struct regcache *regcache)
{
  /* Do nothing, since we can store individual regs.  */
}

static void
monitor_files_info (struct target_ops *ops)
{
  printf_unfiltered (_("\tAttached to %s at %d baud.\n"), dev_name, baud_rate);
}

static int
monitor_write_memory (CORE_ADDR memaddr, char *myaddr, int len)
{
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
  unsigned int val, hostval;
  char *cmd;
  int i;

  monitor_debug ("MON write %d %s\n", len, paddress (target_gdbarch (), memaddr));

  if (current_monitor->flags & MO_ADDR_BITS_REMOVE)
    memaddr = gdbarch_addr_bits_remove (target_gdbarch (), memaddr);

  /* Use memory fill command for leading 0 bytes.  */

  if (current_monitor->fill)
    {
      for (i = 0; i < len; i++)
	if (myaddr[i] != 0)
	  break;

      if (i > 4)		/* More than 4 zeros is worth doing.  */
	{
	  monitor_debug ("MON FILL %d\n", i);
	  if (current_monitor->flags & MO_FILL_USES_ADDR)
	    monitor_printf (current_monitor->fill, memaddr,
			    (memaddr + i) - 1, 0);
	  else
	    monitor_printf (current_monitor->fill, memaddr, i, 0);

	  monitor_expect_prompt (NULL, 0);

	  return i;
	}
    }

#if 0
  /* Can't actually use long longs if VAL is an int (nice idea, though).  */
  if ((memaddr & 0x7) == 0 && len >= 8 && current_monitor->setmem.cmdll)
    {
      len = 8;
      cmd = current_monitor->setmem.cmdll;
    }
  else
#endif
  if ((memaddr & 0x3) == 0 && len >= 4 && current_monitor->setmem.cmdl)
    {
      len = 4;
      cmd = current_monitor->setmem.cmdl;
    }
  else if ((memaddr & 0x1) == 0 && len >= 2 && current_monitor->setmem.cmdw)
    {
      len = 2;
      cmd = current_monitor->setmem.cmdw;
    }
  else
    {
      len = 1;
      cmd = current_monitor->setmem.cmdb;
    }

  val = extract_unsigned_integer (myaddr, len, byte_order);

  if (len == 4)
    {
      hostval = *(unsigned int *) myaddr;
      monitor_debug ("Hostval(%08x) val(%08x)\n", hostval, val);
    }


  if (current_monitor->flags & MO_NO_ECHO_ON_SETMEM)
    monitor_printf_noecho (cmd, memaddr, val);
  else if (current_monitor->flags & MO_SETMEM_INTERACTIVE)
    {
      monitor_printf_noecho (cmd, memaddr);

      if (current_monitor->setmem.resp_delim)
        {
          monitor_debug ("EXP setmem.resp_delim");
          monitor_expect_regexp (&setmem_resp_delim_pattern, NULL, 0); 
	  monitor_printf ("%x\r", val);
       }
      if (current_monitor->setmem.term)
	{
	  monitor_debug ("EXP setmem.term");
	  monitor_expect (current_monitor->setmem.term, NULL, 0);
	  monitor_printf ("%x\r", val);
	}
      if (current_monitor->setmem.term_cmd)
	{	/* Emit this to get out of the memory editing state.  */
	  monitor_printf ("%s", current_monitor->setmem.term_cmd);
	  /* Drop through to expecting a prompt.  */
	}
    }
  else
    monitor_printf (cmd, memaddr, val);

  monitor_expect_prompt (NULL, 0);

  return len;
}


static int
monitor_write_memory_bytes (CORE_ADDR memaddr, char *myaddr, int len)
{
  unsigned char val;
  int written = 0;

  if (len == 0)
    return 0;
  /* Enter the sub mode.  */
  monitor_printf (current_monitor->setmem.cmdb, memaddr);
  monitor_expect_prompt (NULL, 0);
  while (len)
    {
      val = *myaddr;
      monitor_printf ("%x\r", val);
      myaddr++;
      memaddr++;
      written++;
      /* If we wanted to, here we could validate the address.  */
      monitor_expect_prompt (NULL, 0);
      len--;
    }
  /* Now exit the sub mode.  */
  monitor_printf (current_monitor->getreg.term_cmd);
  monitor_expect_prompt (NULL, 0);
  return written;
}


static void
longlongendswap (unsigned char *a)
{
  int i, j;
  unsigned char x;

  i = 0;
  j = 7;
  while (i < 4)
    {
      x = *(a + i);
      *(a + i) = *(a + j);
      *(a + j) = x;
      i++, j--;
    }
}
/* Format 32 chars of long long value, advance the pointer.  */
static char *hexlate = "0123456789abcdef";
static char *
longlong_hexchars (unsigned long long value,
		   char *outbuff)
{
  if (value == 0)
    {
      *outbuff++ = '0';
      return outbuff;
    }
  else
    {
      static unsigned char disbuf[8];	/* disassembly buffer */
      unsigned char *scan, *limit;	/* loop controls */
      unsigned char c, nib;
      int leadzero = 1;

      scan = disbuf;
      limit = scan + 8;
      {
	unsigned long long *dp;

	dp = (unsigned long long *) scan;
	*dp = value;
      }
      longlongendswap (disbuf);	/* FIXME: ONly on big endian hosts.  */
      while (scan < limit)
	{
	  c = *scan++;		/* A byte of our long long value.  */
	  if (leadzero)
	    {
	      if (c == 0)
		continue;
	      else
		leadzero = 0;	/* Henceforth we print even zeroes.  */
	    }
	  nib = c >> 4;		/* high nibble bits */
	  *outbuff++ = hexlate[nib];
	  nib = c & 0x0f;	/* low nibble bits */
	  *outbuff++ = hexlate[nib];
	}
      return outbuff;
    }
}				/* longlong_hexchars */



/* I am only going to call this when writing virtual byte streams.
   Which possably entails endian conversions.  */

static int
monitor_write_memory_longlongs (CORE_ADDR memaddr, char *myaddr, int len)
{
  static char hexstage[20];	/* At least 16 digits required, plus null.  */
  char *endstring;
  long long *llptr;
  long long value;
  int written = 0;

  llptr = (unsigned long long *) myaddr;
  if (len == 0)
    return 0;
  monitor_printf (current_monitor->setmem.cmdll, memaddr);
  monitor_expect_prompt (NULL, 0);
  while (len >= 8)
    {
      value = *llptr;
      endstring = longlong_hexchars (*llptr, hexstage);
      *endstring = '\0';	/* NUll terminate for printf.  */
      monitor_printf ("%s\r", hexstage);
      llptr++;
      memaddr += 8;
      written += 8;
      /* If we wanted to, here we could validate the address.  */
      monitor_expect_prompt (NULL, 0);
      len -= 8;
    }
  /* Now exit the sub mode.  */
  monitor_printf (current_monitor->getreg.term_cmd);
  monitor_expect_prompt (NULL, 0);
  return written;
}				/* */



/* ----- MONITOR_WRITE_MEMORY_BLOCK ---------------------------- */
/* This is for the large blocks of memory which may occur in downloading.
   And for monitors which use interactive entry,
   And for monitors which do not have other downloading methods.
   Without this, we will end up calling monitor_write_memory many times
   and do the entry and exit of the sub mode many times
   This currently assumes...
   MO_SETMEM_INTERACTIVE
   ! MO_NO_ECHO_ON_SETMEM
   To use this, the you have to patch the monitor_cmds block with
   this function.  Otherwise, its not tuned up for use by all
   monitor variations.  */

static int
monitor_write_memory_block (CORE_ADDR memaddr, char *myaddr, int len)
{
  int written;

  written = 0;
  /* FIXME: This would be a good place to put the zero test.  */
#if 1
  if ((len > 8) && (((len & 0x07)) == 0) && current_monitor->setmem.cmdll)
    {
      return monitor_write_memory_longlongs (memaddr, myaddr, len);
    }
#endif
  written = monitor_write_memory_bytes (memaddr, myaddr, len);
  return written;
}

/* This is an alternate form of monitor_read_memory which is used for monitors
   which can only read a single byte/word/etc. at a time.  */

static int
monitor_read_memory_single (CORE_ADDR memaddr, char *myaddr, int len)
{
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
  unsigned int val;
  char membuf[sizeof (int) * 2 + 1];
  char *p;
  char *cmd;

  monitor_debug ("MON read single\n");
#if 0
  /* Can't actually use long longs (nice idea, though).  In fact, the
     call to strtoul below will fail if it tries to convert a value
     that's too big to fit in a long.  */
  if ((memaddr & 0x7) == 0 && len >= 8 && current_monitor->getmem.cmdll)
    {
      len = 8;
      cmd = current_monitor->getmem.cmdll;
    }
  else
#endif
  if ((memaddr & 0x3) == 0 && len >= 4 && current_monitor->getmem.cmdl)
    {
      len = 4;
      cmd = current_monitor->getmem.cmdl;
    }
  else if ((memaddr & 0x1) == 0 && len >= 2 && current_monitor->getmem.cmdw)
    {
      len = 2;
      cmd = current_monitor->getmem.cmdw;
    }
  else
    {
      len = 1;
      cmd = current_monitor->getmem.cmdb;
    }

  /* Send the examine command.  */

  monitor_printf (cmd, memaddr);

  /* If RESP_DELIM is specified, we search for that as a leading
     delimiter for the memory value.  Otherwise, we just start
     searching from the start of the buf.  */

  if (current_monitor->getmem.resp_delim)
    {
      monitor_debug ("EXP getmem.resp_delim\n");
      monitor_expect_regexp (&getmem_resp_delim_pattern, NULL, 0);
    }

  /* Now, read the appropriate number of hex digits for this loc,
     skipping spaces.  */

  /* Skip leading spaces and "0x" if MO_HEX_PREFIX flag is set.  */
  if (current_monitor->flags & MO_HEX_PREFIX)
    {
      int c;

      c = readchar (timeout);
      while (c == ' ')
	c = readchar (timeout);
      if ((c == '0') && ((c = readchar (timeout)) == 'x'))
	;
      else
	monitor_error ("monitor_read_memory_single", 
		       "bad response from monitor",
		       memaddr, 0, NULL, 0);
    }

  {
    int i;

    for (i = 0; i < len * 2; i++)
      {
	int c;

	while (1)
	  {
	    c = readchar (timeout);
	    if (isxdigit (c))
	      break;
	    if (c == ' ')
	      continue;
	    
	    monitor_error ("monitor_read_memory_single",
			   "bad response from monitor",
			   memaddr, i, membuf, 0);
	  }
      membuf[i] = c;
    }
    membuf[i] = '\000';		/* Terminate the number.  */
  }

/* If TERM is present, we wait for that to show up.  Also, (if TERM is
   present), we will send TERM_CMD if that is present.  In any case, we collect
   all of the output into buf, and then wait for the normal prompt.  */

  if (current_monitor->getmem.term)
    {
      monitor_expect (current_monitor->getmem.term, NULL, 0); /* Get
								 response.  */

      if (current_monitor->getmem.term_cmd)
	{
	  monitor_printf (current_monitor->getmem.term_cmd);
	  monitor_expect_prompt (NULL, 0);
	}
    }
  else
    monitor_expect_prompt (NULL, 0);	/* Get response.  */

  p = membuf;
  val = strtoul (membuf, &p, 16);

  if (val == 0 && membuf == p)
    monitor_error ("monitor_read_memory_single",
		   "bad value from monitor",
		   memaddr, 0, membuf, 0);

  /* supply register stores in target byte order, so swap here.  */

  store_unsigned_integer (myaddr, len, byte_order, val);

  return len;
}

/* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
   memory at MEMADDR.  Returns length moved.  Currently, we do no more
   than 16 bytes at a time.  */

static int
monitor_read_memory (CORE_ADDR memaddr, char *myaddr, int len)
{
  unsigned int val;
  char buf[512];
  char *p, *p1;
  int resp_len;
  int i;
  CORE_ADDR dumpaddr;

  if (len <= 0)
    {
      monitor_debug ("Zero length call to monitor_read_memory\n");
      return 0;
    }

  monitor_debug ("MON read block ta(%s) ha(%s) %d\n",
		 paddress (target_gdbarch (), memaddr),
		 host_address_to_string (myaddr), len);

  if (current_monitor->flags & MO_ADDR_BITS_REMOVE)
    memaddr = gdbarch_addr_bits_remove (target_gdbarch (), memaddr);

  if (current_monitor->flags & MO_GETMEM_READ_SINGLE)
    return monitor_read_memory_single (memaddr, myaddr, len);

  len = min (len, 16);

  /* Some dumpers align the first data with the preceding 16
     byte boundary.  Some print blanks and start at the
     requested boundary.  EXACT_DUMPADDR  */

  dumpaddr = (current_monitor->flags & MO_EXACT_DUMPADDR)
    ? memaddr : memaddr & ~0x0f;

  /* See if xfer would cross a 16 byte boundary.  If so, clip it.  */
  if (((memaddr ^ (memaddr + len - 1)) & ~0xf) != 0)
    len = ((memaddr + len) & ~0xf) - memaddr;

  /* Send the memory examine command.  */

  if (current_monitor->flags & MO_GETMEM_NEEDS_RANGE)
    monitor_printf (current_monitor->getmem.cmdb, memaddr, memaddr + len);
  else if (current_monitor->flags & MO_GETMEM_16_BOUNDARY)
    monitor_printf (current_monitor->getmem.cmdb, dumpaddr);
  else
    monitor_printf (current_monitor->getmem.cmdb, memaddr, len);

  /* If TERM is present, we wait for that to show up.  Also, (if TERM
     is present), we will send TERM_CMD if that is present.  In any
     case, we collect all of the output into buf, and then wait for
     the normal prompt.  */

  if (current_monitor->getmem.term)
    {
      resp_len = monitor_expect (current_monitor->getmem.term,
				 buf, sizeof buf);	/* Get response.  */

      if (resp_len <= 0)
	monitor_error ("monitor_read_memory",
		       "excessive response from monitor",
		       memaddr, resp_len, buf, 0);

      if (current_monitor->getmem.term_cmd)
	{
	  serial_write (monitor_desc, current_monitor->getmem.term_cmd,
			strlen (current_monitor->getmem.term_cmd));
	  monitor_expect_prompt (NULL, 0);
	}
    }
  else
    resp_len = monitor_expect_prompt (buf, sizeof buf);	 /* Get response.  */

  p = buf;

  /* If RESP_DELIM is specified, we search for that as a leading
     delimiter for the values.  Otherwise, we just start searching
     from the start of the buf.  */

  if (current_monitor->getmem.resp_delim)
    {
      int retval, tmp;
      struct re_registers resp_strings;

      monitor_debug ("MON getmem.resp_delim %s\n",
		     current_monitor->getmem.resp_delim);

      memset (&resp_strings, 0, sizeof (struct re_registers));
      tmp = strlen (p);
      retval = re_search (&getmem_resp_delim_pattern, p, tmp, 0, tmp,
			  &resp_strings);

      if (retval < 0)
	monitor_error ("monitor_read_memory",
		       "bad response from monitor",
		       memaddr, resp_len, buf, 0);

      p += resp_strings.end[0];
#if 0
      p = strstr (p, current_monitor->getmem.resp_delim);
      if (!p)
	monitor_error ("monitor_read_memory",
		       "bad response from monitor",
		       memaddr, resp_len, buf, 0);
      p += strlen (current_monitor->getmem.resp_delim);
#endif
    }
  monitor_debug ("MON scanning  %d ,%s '%s'\n", len,
		 host_address_to_string (p), p);
  if (current_monitor->flags & MO_GETMEM_16_BOUNDARY)
    {
      char c;
      int fetched = 0;
      i = len;
      c = *p;


      while (!(c == '\000' || c == '\n' || c == '\r') && i > 0)
	{
	  if (isxdigit (c))
	    {
	      if ((dumpaddr >= memaddr) && (i > 0))
		{
		  val = fromhex (c) * 16 + fromhex (*(p + 1));
		  *myaddr++ = val;
		  if (monitor_debug_p || remote_debug)
		    fprintf_unfiltered (gdb_stdlog, "[%02x]", val);
		  --i;
		  fetched++;
		}
	      ++dumpaddr;
	      ++p;
	    }
	  ++p;			/* Skip a blank or other non hex char.  */
	  c = *p;
	}
      if (fetched == 0)
	error (_("Failed to read via monitor"));
      if (monitor_debug_p || remote_debug)
	fprintf_unfiltered (gdb_stdlog, "\n");
      return fetched;		/* Return the number of bytes actually
				   read.  */
    }
  monitor_debug ("MON scanning bytes\n");

  for (i = len; i > 0; i--)
    {
      /* Skip non-hex chars, but bomb on end of string and newlines.  */

      while (1)
	{
	  if (isxdigit (*p))
	    break;

	  if (*p == '\000' || *p == '\n' || *p == '\r')
	    monitor_error ("monitor_read_memory",
			   "badly terminated response from monitor",
			   memaddr, resp_len, buf, 0);
	  p++;
	}

      val = strtoul (p, &p1, 16);

      if (val == 0 && p == p1)
	monitor_error ("monitor_read_memory",
		       "bad value from monitor",
		       memaddr, resp_len, buf, 0);

      *myaddr++ = val;

      if (i == 1)
	break;

      p = p1;
    }

  return len;
}

/* Transfer LEN bytes between target address MEMADDR and GDB address
   MYADDR.  Returns 0 for success, errno code for failure.  TARGET is
   unused.  */

static int
monitor_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write,
		     struct mem_attrib *attrib, struct target_ops *target)
{
  int res;

  if (write)
    {
      if (current_monitor->flags & MO_HAS_BLOCKWRITES)
	res = monitor_write_memory_block(memaddr, myaddr, len);
      else
	res = monitor_write_memory(memaddr, myaddr, len);
    }
  else
    {
      res = monitor_read_memory(memaddr, myaddr, len);
    }

  return res;
}

static void
monitor_kill (struct target_ops *ops)
{
  return;			/* Ignore attempts to kill target system.  */
}

/* All we actually do is set the PC to the start address of exec_bfd.  */

static void
monitor_create_inferior (struct target_ops *ops, char *exec_file,
			 char *args, char **env, int from_tty)
{
  if (args && (*args != '\000'))
    error (_("Args are not supported by the monitor."));

  first_time = 1;
  clear_proceed_status ();
  regcache_write_pc (get_current_regcache (),
		     bfd_get_start_address (exec_bfd));
}

/* Clean up when a program exits.
   The program actually lives on in the remote processor's RAM, and may be
   run again without a download.  Don't leave it full of breakpoint
   instructions.  */

static void
monitor_mourn_inferior (struct target_ops *ops)
{
  unpush_target (targ_ops);
  generic_mourn_inferior ();	/* Do all the proper things now.  */
  delete_thread_silent (monitor_ptid);
}

/* Tell the monitor to add a breakpoint.  */

static int
monitor_insert_breakpoint (struct gdbarch *gdbarch,
			   struct bp_target_info *bp_tgt)
{
  CORE_ADDR addr = bp_tgt->placed_address;
  int i;
  int bplen;

  monitor_debug ("MON inst bkpt %s\n", paddress (gdbarch, addr));
  if (current_monitor->set_break == NULL)
    error (_("No set_break defined for this monitor"));

  if (current_monitor->flags & MO_ADDR_BITS_REMOVE)
    addr = gdbarch_addr_bits_remove (gdbarch, addr);

  /* Determine appropriate breakpoint size for this address.  */
  gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen);
  bp_tgt->placed_address = addr;
  bp_tgt->placed_size = bplen;

  for (i = 0; i < current_monitor->num_breakpoints; i++)
    {
      if (breakaddr[i] == 0)
	{
	  breakaddr[i] = addr;
	  monitor_printf (current_monitor->set_break, addr);
	  monitor_expect_prompt (NULL, 0);
	  return 0;
	}
    }

  error (_("Too many breakpoints (> %d) for monitor."),
	 current_monitor->num_breakpoints);
}

/* Tell the monitor to remove a breakpoint.  */

static int
monitor_remove_breakpoint (struct gdbarch *gdbarch,
			   struct bp_target_info *bp_tgt)
{
  CORE_ADDR addr = bp_tgt->placed_address;
  int i;

  monitor_debug ("MON rmbkpt %s\n", paddress (gdbarch, addr));
  if (current_monitor->clr_break == NULL)
    error (_("No clr_break defined for this monitor"));

  for (i = 0; i < current_monitor->num_breakpoints; i++)
    {
      if (breakaddr[i] == addr)
	{
	  breakaddr[i] = 0;
	  /* Some monitors remove breakpoints based on the address.  */
	  if (current_monitor->flags & MO_CLR_BREAK_USES_ADDR)
	    monitor_printf (current_monitor->clr_break, addr);
	  else if (current_monitor->flags & MO_CLR_BREAK_1_BASED)
	    monitor_printf (current_monitor->clr_break, i + 1);
	  else
	    monitor_printf (current_monitor->clr_break, i);
	  monitor_expect_prompt (NULL, 0);
	  return 0;
	}
    }
  fprintf_unfiltered (gdb_stderr,
		      "Can't find breakpoint associated with %s\n",
		      paddress (gdbarch, addr));
  return 1;
}

/* monitor_wait_srec_ack -- wait for the target to send an acknowledgement for
   an S-record.  Return non-zero if the ACK is received properly.  */

static int
monitor_wait_srec_ack (void)
{
  int ch;

  if (current_monitor->flags & MO_SREC_ACK_PLUS)
    {
      return (readchar (timeout) == '+');
    }
  else if (current_monitor->flags & MO_SREC_ACK_ROTATE)
    {
      /* Eat two backspaces, a "rotating" char (|/-\), and a space.  */
      if ((ch = readchar (1)) < 0)
	return 0;
      if ((ch = readchar (1)) < 0)
	return 0;
      if ((ch = readchar (1)) < 0)
	return 0;
      if ((ch = readchar (1)) < 0)
	return 0;
    }
  return 1;
}

/* monitor_load -- download a file.  */

static void
monitor_load (char *file, int from_tty)
{
  monitor_debug ("MON load\n");

  if (current_monitor->load_routine)
    current_monitor->load_routine (monitor_desc, file, hashmark);
  else
    {				/* The default is ascii S-records.  */
      int n;
      unsigned long load_offset;
      char buf[128];

      /* Enable user to specify address for downloading as 2nd arg to load.  */
      n = sscanf (file, "%s 0x%lx", buf, &load_offset);
      if (n > 1)
	file = buf;
      else
	load_offset = 0;

      monitor_printf (current_monitor->load);
      if (current_monitor->loadresp)
	monitor_expect (current_monitor->loadresp, NULL, 0);

      load_srec (monitor_desc, file, (bfd_vma) load_offset,
		 32, SREC_ALL, hashmark,
		 current_monitor->flags & MO_SREC_ACK ?
		 monitor_wait_srec_ack : NULL);

      monitor_expect_prompt (NULL, 0);
    }

  /* Finally, make the PC point at the start address.  */
  if (exec_bfd)
    regcache_write_pc (get_current_regcache (),
		       bfd_get_start_address (exec_bfd));

  /* There used to be code here which would clear inferior_ptid and
     call clear_symtab_users.  None of that should be necessary:
     monitor targets should behave like remote protocol targets, and
     since generic_load does none of those things, this function
     shouldn't either.

     Furthermore, clearing inferior_ptid is *incorrect*.  After doing
     a load, we still have a valid connection to the monitor, with a
     live processor state to fiddle with.  The user can type
     `continue' or `jump *start' and make the program run.  If they do
     these things, however, GDB will be talking to a running program
     while inferior_ptid is null_ptid; this makes things like
     reinit_frame_cache very confused.  */
}

static void
monitor_stop (ptid_t ptid)
{
  monitor_debug ("MON stop\n");
  if ((current_monitor->flags & MO_SEND_BREAK_ON_STOP) != 0)
    serial_send_break (monitor_desc);
  if (current_monitor->stop)
    monitor_printf_noecho (current_monitor->stop);
}

/* Put a COMMAND string out to MONITOR.  Output from MONITOR is placed
   in OUTPUT until the prompt is seen.  FIXME: We read the characters
   ourseleves here cause of a nasty echo.  */

static void
monitor_rcmd (char *command,
	      struct ui_file *outbuf)
{
  char *p;
  int resp_len;
  char buf[1000];

  if (monitor_desc == NULL)
    error (_("monitor target not open."));

  p = current_monitor->prompt;

  /* Send the command.  Note that if no args were supplied, then we're
     just sending the monitor a newline, which is sometimes useful.  */

  monitor_printf ("%s\r", (command ? command : ""));

  resp_len = monitor_expect_prompt (buf, sizeof buf);

  fputs_unfiltered (buf, outbuf);	/* Output the response.  */
}

/* Convert hex digit A to a number.  */

#if 0
static int
from_hex (int a)
{
  if (a >= '0' && a <= '9')
    return a - '0';
  if (a >= 'a' && a <= 'f')
    return a - 'a' + 10;
  if (a >= 'A' && a <= 'F')
    return a - 'A' + 10;

  error (_("Reply contains invalid hex digit 0x%x"), a);
}
#endif

char *
monitor_get_dev_name (void)
{
  return dev_name;
}

/* Check to see if a thread is still alive.  */

static int
monitor_thread_alive (struct target_ops *ops, ptid_t ptid)
{
  if (ptid_equal (ptid, monitor_ptid))
    /* The monitor's task is always alive.  */
    return 1;

  return 0;
}

/* Convert a thread ID to a string.  Returns the string in a static
   buffer.  */

static char *
monitor_pid_to_str (struct target_ops *ops, ptid_t ptid)
{
  static char buf[64];

  if (ptid_equal (monitor_ptid, ptid))
    {
      xsnprintf (buf, sizeof buf, "Thread <main>");
      return buf;
    }

  return normal_pid_to_str (ptid);
}

static struct target_ops monitor_ops;

static void
init_base_monitor_ops (void)
{
  monitor_ops.to_close = monitor_close;
  monitor_ops.to_detach = monitor_detach;
  monitor_ops.to_resume = monitor_resume;
  monitor_ops.to_wait = monitor_wait;
  monitor_ops.to_fetch_registers = monitor_fetch_registers;
  monitor_ops.to_store_registers = monitor_store_registers;
  monitor_ops.to_prepare_to_store = monitor_prepare_to_store;
  monitor_ops.deprecated_xfer_memory = monitor_xfer_memory;
  monitor_ops.to_files_info = monitor_files_info;
  monitor_ops.to_insert_breakpoint = monitor_insert_breakpoint;
  monitor_ops.to_remove_breakpoint = monitor_remove_breakpoint;
  monitor_ops.to_kill = monitor_kill;
  monitor_ops.to_load = monitor_load;
  monitor_ops.to_create_inferior = monitor_create_inferior;
  monitor_ops.to_mourn_inferior = monitor_mourn_inferior;
  monitor_ops.to_stop = monitor_stop;
  monitor_ops.to_rcmd = monitor_rcmd;
  monitor_ops.to_log_command = serial_log_command;
  monitor_ops.to_thread_alive = monitor_thread_alive;
  monitor_ops.to_pid_to_str = monitor_pid_to_str;
  monitor_ops.to_stratum = process_stratum;
  monitor_ops.to_has_all_memory = default_child_has_all_memory;
  monitor_ops.to_has_memory = default_child_has_memory;
  monitor_ops.to_has_stack = default_child_has_stack;
  monitor_ops.to_has_registers = default_child_has_registers;
  monitor_ops.to_has_execution = default_child_has_execution;
  monitor_ops.to_magic = OPS_MAGIC;
}				/* init_base_monitor_ops */

/* Init the target_ops structure pointed at by OPS.  */

void
init_monitor_ops (struct target_ops *ops)
{
  if (monitor_ops.to_magic != OPS_MAGIC)
    init_base_monitor_ops ();

  memcpy (ops, &monitor_ops, sizeof monitor_ops);
}

/* Define additional commands that are usually only used by monitors.  */

/* -Wmissing-prototypes */
extern initialize_file_ftype _initialize_remote_monitors;

void
_initialize_remote_monitors (void)
{
  init_base_monitor_ops ();
  add_setshow_boolean_cmd ("hash", no_class, &hashmark, _("\
Set display of activity while downloading a file."), _("\
Show display of activity while downloading a file."), _("\
When enabled, a hashmark \'#\' is displayed."),
			   NULL,
			   NULL, /* FIXME: i18n: */
			   &setlist, &showlist);

  add_setshow_zuinteger_cmd ("monitor", no_class, &monitor_debug_p, _("\
Set debugging of remote monitor communication."), _("\
Show debugging of remote monitor communication."), _("\
When enabled, communication between GDB and the remote monitor\n\
is displayed."),
			     NULL,
			     NULL, /* FIXME: i18n: */
			     &setdebuglist, &showdebuglist);

  /* Yes, 42000 is arbitrary.  The only sense out of it, is that it
     isn't 0.  */
  monitor_ptid = ptid_build (42000, 0, 42000);
}