aboutsummaryrefslogtreecommitdiff
path: root/gdb/win32-nat.c
blob: f0d87efe24f8fdc7c79342ba5ce683441e729430 (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
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
/* Target-vector operations for controlling win32 child processes, for GDB.

   Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free
   Software Foundation, Inc.

   Contributed by Cygnus Solutions, A Red Hat Company.

   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 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 eve nthe 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.  */

/* Originally by Steve Chamberlain, sac@cygnus.com */

/* We assume we're being built with and will be used for cygwin.  */

#include "defs.h"
#include "frame.h"		/* required by inferior.h */
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "command.h"
#include "completer.h"
#include "regcache.h"
#include "top.h"
#include "i386-tdep.h"
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <windows.h>
#include <imagehlp.h>
#include <sys/cygwin.h>

#include "buildsym.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdb_string.h"
#include "gdbthread.h"
#include "gdbcmd.h"
#include <sys/param.h>
#include <unistd.h>

/* The ui's event loop. */
extern int (*ui_loop_hook) (int signo);

/* If we're not using the old Cygwin header file set, define the
   following which never should have been in the generic Win32 API
   headers in the first place since they were our own invention... */
#ifndef _GNU_H_WINDOWS_H
enum
  {
    FLAG_TRACE_BIT = 0x100,
    CONTEXT_DEBUGGER = (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
  };
#endif
#include <sys/procfs.h>
#include <psapi.h>

#define CONTEXT_DEBUGGER_DR CONTEXT_DEBUGGER | CONTEXT_DEBUG_REGISTERS \
	| CONTEXT_EXTENDED_REGISTERS

static unsigned dr[8];
static int debug_registers_changed = 0;
static int debug_registers_used = 0;

/* The string sent by cygwin when it processes a signal.
   FIXME: This should be in a cygwin include file. */
#define CYGWIN_SIGNAL_STRING "cygwin: signal"

#define CHECK(x)	check (x, __FILE__,__LINE__)
#define DEBUG_EXEC(x)	if (debug_exec)		printf_unfiltered x
#define DEBUG_EVENTS(x)	if (debug_events)	printf_unfiltered x
#define DEBUG_MEM(x)	if (debug_memory)	printf_unfiltered x
#define DEBUG_EXCEPT(x)	if (debug_exceptions)	printf_unfiltered x

/* Forward declaration */
extern struct target_ops child_ops;

static void child_stop (void);
static int win32_child_thread_alive (ptid_t);
void child_kill_inferior (void);

static enum target_signal last_sig = TARGET_SIGNAL_0;
/* Set if a signal was received from the debugged process */

/* Thread information structure used to track information that is
   not available in gdb's thread structure. */
typedef struct thread_info_struct
  {
    struct thread_info_struct *next;
    DWORD id;
    HANDLE h;
    char *name;
    int suspend_count;
    CONTEXT context;
    STACKFRAME sf;
  }
thread_info;

static thread_info thread_head;

/* The process and thread handles for the above context. */

static DEBUG_EVENT current_event;	/* The current debug event from
					   WaitForDebugEvent */
static HANDLE current_process_handle;	/* Currently executing process */
static thread_info *current_thread;	/* Info on currently selected thread */
static DWORD main_thread_id;		/* Thread ID of the main thread */

/* Counts of things. */
static int exception_count = 0;
static int event_count = 0;
static int saw_create;

/* User options. */
static int new_console = 0;
static int new_group = 1;
static int debug_exec = 0;		/* show execution */
static int debug_events = 0;		/* show events from kernel */
static int debug_memory = 0;		/* show target memory accesses */
static int debug_exceptions = 0;	/* show target exceptions */
static int useshell = 0;		/* use shell for subprocesses */

/* This vector maps GDB's idea of a register's number into an address
   in the win32 exception context vector.

   It also contains the bit mask needed to load the register in question.

   One day we could read a reg, we could inspect the context we
   already have loaded, if it doesn't have the bit set that we need,
   we read that set of registers in using GetThreadContext.  If the
   context already contains what we need, we just unpack it. Then to
   write a register, first we have to ensure that the context contains
   the other regs of the group, and then we copy the info in and set
   out bit. */

#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
static const int mappings[] =
{
  context_offset (Eax),
  context_offset (Ecx),
  context_offset (Edx),
  context_offset (Ebx),
  context_offset (Esp),
  context_offset (Ebp),
  context_offset (Esi),
  context_offset (Edi),
  context_offset (Eip),
  context_offset (EFlags),
  context_offset (SegCs),
  context_offset (SegSs),
  context_offset (SegDs),
  context_offset (SegEs),
  context_offset (SegFs),
  context_offset (SegGs),
  context_offset (FloatSave.RegisterArea[0 * 10]),
  context_offset (FloatSave.RegisterArea[1 * 10]),
  context_offset (FloatSave.RegisterArea[2 * 10]),
  context_offset (FloatSave.RegisterArea[3 * 10]),
  context_offset (FloatSave.RegisterArea[4 * 10]),
  context_offset (FloatSave.RegisterArea[5 * 10]),
  context_offset (FloatSave.RegisterArea[6 * 10]),
  context_offset (FloatSave.RegisterArea[7 * 10]),
  context_offset (FloatSave.ControlWord),
  context_offset (FloatSave.StatusWord),
  context_offset (FloatSave.TagWord),
  context_offset (FloatSave.ErrorSelector),
  context_offset (FloatSave.ErrorOffset),
  context_offset (FloatSave.DataSelector),
  context_offset (FloatSave.DataOffset),
  context_offset (FloatSave.ErrorSelector)
#ifdef HAVE_SSE_REGS
  /* XMM0-7 */ ,
  context_offset (ExtendedRegisters[10*16]),
  context_offset (ExtendedRegisters[11*16]),
  context_offset (ExtendedRegisters[12*16]),
  context_offset (ExtendedRegisters[13*16]),
  context_offset (ExtendedRegisters[14*16]),
  context_offset (ExtendedRegisters[15*16]),
  context_offset (ExtendedRegisters[16*16]),
  context_offset (ExtendedRegisters[17*16]),
  /* MXCSR */
  context_offset (ExtendedRegisters[24])
#endif
};

#undef context_offset

/* This vector maps the target's idea of an exception (extracted
   from the DEBUG_EVENT structure) to GDB's idea. */

struct xlate_exception
  {
    int them;
    enum target_signal us;
  };

static const struct xlate_exception
  xlate[] =
{
  {EXCEPTION_ACCESS_VIOLATION, TARGET_SIGNAL_SEGV},
  {STATUS_STACK_OVERFLOW, TARGET_SIGNAL_SEGV},
  {EXCEPTION_BREAKPOINT, TARGET_SIGNAL_TRAP},
  {DBG_CONTROL_C, TARGET_SIGNAL_INT},
  {EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
  {STATUS_FLOAT_DIVIDE_BY_ZERO, TARGET_SIGNAL_FPE},
  {-1, -1}};

static void
check (BOOL ok, const char *file, int line)
{
  if (!ok)
    printf_filtered ("error return %s:%d was %lu\n", file, line,
		     GetLastError ());
}


/* Find a thread record given a thread id.
   If get_context then also retrieve the context for this
   thread. */
static thread_info *
thread_rec (DWORD id, int get_context)
{
  thread_info *th;

  for (th = &thread_head; (th = th->next) != NULL;)
    if (th->id == id)
      {
	if (!th->suspend_count && get_context)
	  {
	    if (get_context > 0 && id != current_event.dwThreadId)
	      th->suspend_count = SuspendThread (th->h) + 1;
	    else if (get_context < 0)
	      th->suspend_count = -1;

	    th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
	    GetThreadContext (th->h, &th->context);
	    if (id == current_event.dwThreadId)
	      {
		/* Copy dr values from that thread.  */
		dr[0] = th->context.Dr0;
		dr[1] = th->context.Dr1;
		dr[2] = th->context.Dr2;
		dr[3] = th->context.Dr3;
		dr[6] = th->context.Dr6;
		dr[7] = th->context.Dr7;
	      }
	  }
	return th;
      }

  return NULL;
}

/* Add a thread to the thread list */
static thread_info *
child_add_thread (DWORD id, HANDLE h)
{
  thread_info *th;

  if ((th = thread_rec (id, FALSE)))
    return th;

  th = (thread_info *) xmalloc (sizeof (*th));
  memset (th, 0, sizeof (*th));
  th->id = id;
  th->h = h;
  th->next = thread_head.next;
  thread_head.next = th;
  add_thread (pid_to_ptid (id));
  /* Set the debug registers for the new thread in they are used.  */
  if (debug_registers_used)
    {
      /* Only change the value of the debug registers.  */
      th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
      CHECK (GetThreadContext (th->h, &th->context));
      th->context.Dr0 = dr[0];
      th->context.Dr1 = dr[1];
      th->context.Dr2 = dr[2];
      th->context.Dr3 = dr[3];
      /* th->context.Dr6 = dr[6];
      FIXME: should we set dr6 also ?? */
      th->context.Dr7 = dr[7];
      CHECK (SetThreadContext (th->h, &th->context));
      th->context.ContextFlags = 0;
    }
  return th;
}

/* Clear out any old thread list and reintialize it to a
   pristine state. */
static void
child_init_thread_list (void)
{
  thread_info *th = &thread_head;

  DEBUG_EVENTS (("gdb: child_init_thread_list\n"));
  init_thread_list ();
  while (th->next != NULL)
    {
      thread_info *here = th->next;
      th->next = here->next;
      (void) CloseHandle (here->h);
      xfree (here);
    }
}

/* Delete a thread from the list of threads */
static void
child_delete_thread (DWORD id)
{
  thread_info *th;

  if (info_verbose)
    printf_unfiltered ("[Deleting %s]\n", target_pid_to_str (pid_to_ptid (id)));
  delete_thread (pid_to_ptid (id));

  for (th = &thread_head;
       th->next != NULL && th->next->id != id;
       th = th->next)
    continue;

  if (th->next != NULL)
    {
      thread_info *here = th->next;
      th->next = here->next;
      CloseHandle (here->h);
      xfree (here);
    }
}

static void
do_child_fetch_inferior_registers (int r)
{
  char *context_offset = ((char *) &current_thread->context) + mappings[r];
  long l;
  if (r == FCS_REGNUM)
    {
      l = *((long *) context_offset) & 0xffff;
      supply_register (r, (char *) &l);
    }
  else if (r == FOP_REGNUM)
    {
      l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
      supply_register (r, (char *) &l);
    }
  else if (r >= 0)
    supply_register (r, context_offset);
  else
    {
      for (r = 0; r < NUM_REGS; r++)
	do_child_fetch_inferior_registers (r);
    }
}

static void
child_fetch_inferior_registers (int r)
{
  current_thread = thread_rec (PIDGET (inferior_ptid), TRUE);
  do_child_fetch_inferior_registers (r);
}

static void
do_child_store_inferior_registers (int r)
{
  if (r >= 0)
    regcache_collect (r, ((char *) &current_thread->context) + mappings[r]);
  else
    {
      for (r = 0; r < NUM_REGS; r++)
	do_child_store_inferior_registers (r);
    }
}

/* Store a new register value into the current thread context */
static void
child_store_inferior_registers (int r)
{
  current_thread = thread_rec (PIDGET (inferior_ptid), TRUE);
  do_child_store_inferior_registers (r);
}

static int psapi_loaded = 0;
static HMODULE psapi_module_handle = NULL;
static BOOL WINAPI (*psapi_EnumProcessModules) (HANDLE, HMODULE *, DWORD, LPDWORD) = NULL;
static BOOL WINAPI (*psapi_GetModuleInformation) (HANDLE, HMODULE, LPMODULEINFO, DWORD) = NULL;
static DWORD WINAPI (*psapi_GetModuleFileNameExA) (HANDLE, HMODULE, LPSTR, DWORD) = NULL;

int
psapi_get_dll_name (DWORD BaseAddress, char *dll_name_ret)
{
  DWORD len;
  MODULEINFO mi;
  int i;
  HMODULE dh_buf[1];
  HMODULE *DllHandle = dh_buf;
  DWORD cbNeeded;
  BOOL ok;

  if (!psapi_loaded ||
      psapi_EnumProcessModules == NULL ||
      psapi_GetModuleInformation == NULL ||
      psapi_GetModuleFileNameExA == NULL)
    {
      if (psapi_loaded)
	goto failed;
      psapi_loaded = 1;
      psapi_module_handle = LoadLibrary ("psapi.dll");
      if (!psapi_module_handle)
	{
	  /* printf_unfiltered ("error loading psapi.dll: %u", GetLastError ()); */
	  goto failed;
	}
      psapi_EnumProcessModules = GetProcAddress (psapi_module_handle, "EnumProcessModules");
      psapi_GetModuleInformation = GetProcAddress (psapi_module_handle, "GetModuleInformation");
      psapi_GetModuleFileNameExA = (void *) GetProcAddress (psapi_module_handle,
						    "GetModuleFileNameExA");
      if (psapi_EnumProcessModules == NULL ||
	  psapi_GetModuleInformation == NULL ||
	  psapi_GetModuleFileNameExA == NULL)
	goto failed;
    }

  cbNeeded = 0;
  ok = (*psapi_EnumProcessModules) (current_process_handle,
				    DllHandle,
				    sizeof (HMODULE),
				    &cbNeeded);

  if (!ok || !cbNeeded)
    goto failed;

  DllHandle = (HMODULE *) alloca (cbNeeded);
  if (!DllHandle)
    goto failed;

  ok = (*psapi_EnumProcessModules) (current_process_handle,
				    DllHandle,
				    cbNeeded,
				    &cbNeeded);
  if (!ok)
    goto failed;

  for (i = 0; i < (int) (cbNeeded / sizeof (HMODULE)); i++)
    {
      if (!(*psapi_GetModuleInformation) (current_process_handle,
					  DllHandle[i],
					  &mi,
					  sizeof (mi)))
	error ("Can't get module info");

      len = (*psapi_GetModuleFileNameExA) (current_process_handle,
					   DllHandle[i],
					   dll_name_ret,
					   MAX_PATH);
      if (len == 0)
	error ("Error getting dll name: %u\n", (unsigned) GetLastError ());

      if ((DWORD) (mi.lpBaseOfDll) == BaseAddress)
	return 1;
    }

failed:
  dll_name_ret[0] = '\0';
  return 0;
}

/* Encapsulate the information required in a call to
   symbol_file_add_args */
struct safe_symbol_file_add_args
{
  char *name;
  int from_tty;
  struct section_addr_info *addrs;
  int mainline;
  int flags;
  struct ui_file *err, *out;
  struct objfile *ret;
};

/* Maintain a linked list of "so" information. */
struct so_stuff
{
  struct so_stuff *next;
  DWORD load_addr;
  DWORD end_addr;
  int loaded;
  struct objfile *objfile;
  char name[1];
} solib_start, *solib_end;

/* Call symbol_file_add with stderr redirected.  We don't care if there
   are errors. */
static int
safe_symbol_file_add_stub (void *argv)
{
#define p ((struct safe_symbol_file_add_args *)argv)
  struct so_stuff *so = &solib_start;

  while ((so = so->next))
    if (so->loaded && strcasecmp (so->name, p->name) == 0)
      return 0;
  p->ret = symbol_file_add (p->name, p->from_tty, p->addrs, p->mainline, p->flags);
  return !!p->ret;
#undef p
}

/* Restore gdb's stderr after calling symbol_file_add */
static void
safe_symbol_file_add_cleanup (void *p)
{
#define sp ((struct safe_symbol_file_add_args *)p)
  gdb_flush (gdb_stderr);
  gdb_flush (gdb_stdout);
  ui_file_delete (gdb_stderr);
  ui_file_delete (gdb_stdout);
  gdb_stderr = sp->err;
  gdb_stdout = sp->out;
#undef sp
}

/* symbol_file_add wrapper that prevents errors from being displayed. */
static struct objfile *
safe_symbol_file_add (char *name, int from_tty,
		      struct section_addr_info *addrs,
		      int mainline, int flags)
{
  struct safe_symbol_file_add_args p;
  struct cleanup *cleanup;

  cleanup = make_cleanup (safe_symbol_file_add_cleanup, &p);

  p.err = gdb_stderr;
  p.out = gdb_stdout;
  gdb_flush (gdb_stderr);
  gdb_flush (gdb_stdout);
  gdb_stderr = ui_file_new ();
  gdb_stdout = ui_file_new ();
  p.name = name;
  p.from_tty = from_tty;
  p.addrs = addrs;
  p.mainline = mainline;
  p.flags = flags;
  catch_errors (safe_symbol_file_add_stub, &p, "", RETURN_MASK_ERROR);

  do_cleanups (cleanup);
  return p.ret;
}

/* Remember the maximum DLL length for printing in info dll command. */
int max_dll_name_len;

static void
register_loaded_dll (const char *name, DWORD load_addr)
{
  struct so_stuff *so;
  char ppath[MAX_PATH + 1];
  char buf[MAX_PATH + 1];
  char cwd[MAX_PATH + 1];
  char *p;
  WIN32_FIND_DATA w32_fd;
  HANDLE h = FindFirstFile(name, &w32_fd);
  MEMORY_BASIC_INFORMATION m;
  size_t len;

  if (h == INVALID_HANDLE_VALUE)
    strcpy (buf, name);
  else
    {
      FindClose (h);
      strcpy (buf, name);
      if (GetCurrentDirectory (MAX_PATH + 1, cwd))
	{
	  p = strrchr (buf, '\\');
	  if (p)
	    p[1] = '\0';
	  SetCurrentDirectory (buf);
	  GetFullPathName (w32_fd.cFileName, MAX_PATH, buf, &p);
	  SetCurrentDirectory (cwd);
	}
    }

  cygwin_conv_to_posix_path (buf, ppath);
  so = (struct so_stuff *) xmalloc (sizeof (struct so_stuff) + strlen (ppath) + 8 + 1);
  so->loaded = 0;
  so->load_addr = load_addr;
  if (VirtualQueryEx (current_process_handle, (void *) load_addr, &m,
		      sizeof (m)))
    so->end_addr = (DWORD) m.AllocationBase + m.RegionSize;
  else
    so->end_addr = load_addr + 0x2000;	/* completely arbitrary */

  so->next = NULL;
  so->objfile = NULL;
  strcpy (so->name, ppath);

  solib_end->next = so;
  solib_end = so;
  len = strlen (ppath);
  if (len > max_dll_name_len)
    max_dll_name_len = len;
}

char *
get_image_name (HANDLE h, void *address, int unicode)
{
  static char buf[(2 * MAX_PATH) + 1];
  DWORD size = unicode ? sizeof (WCHAR) : sizeof (char);
  char *address_ptr;
  int len = 0;
  char b[2];
  DWORD done;

  /* Attempt to read the name of the dll that was detected.
     This is documented to work only when actively debugging
     a program.  It will not work for attached processes. */
  if (address == NULL)
    return NULL;

  /* See if we could read the address of a string, and that the
     address isn't null. */
  if (!ReadProcessMemory (h, address,  &address_ptr, sizeof (address_ptr), &done)
      || done != sizeof (address_ptr) || !address_ptr)
    return NULL;

  /* Find the length of the string */
  while (ReadProcessMemory (h, address_ptr + len++ * size, &b, size, &done)
	 && (b[0] != 0 || b[size - 1] != 0) && done == size)
    continue;

  if (!unicode)
    ReadProcessMemory (h, address_ptr, buf, len, &done);
  else
    {
      WCHAR *unicode_address = (WCHAR *) alloca (len * sizeof (WCHAR));
      ReadProcessMemory (h, address_ptr, unicode_address, len * sizeof (WCHAR),
			 &done);

      WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, len, 0, 0);
    }

  return buf;
}

/* Wait for child to do something.  Return pid of child, or -1 in case
   of error; store status through argument pointer OURSTATUS.  */
static int
handle_load_dll (void *dummy)
{
  LOAD_DLL_DEBUG_INFO *event = &current_event.u.LoadDll;
  char dll_buf[MAX_PATH + 1];
  char *dll_name = NULL;
  char *p;

  dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0';

  if (!psapi_get_dll_name ((DWORD) (event->lpBaseOfDll), dll_buf))
    dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0';

  dll_name = dll_buf;

  if (*dll_name == '\0')
    dll_name = get_image_name (current_process_handle, event->lpImageName, event->fUnicode);
  if (!dll_name)
    return 1;

  register_loaded_dll (dll_name, (DWORD) event->lpBaseOfDll + 0x1000);

  return 1;
}

static int
handle_unload_dll (void *dummy)
{
  DWORD lpBaseOfDll = (DWORD) current_event.u.UnloadDll.lpBaseOfDll + 0x1000;
  struct so_stuff *so;

  for (so = &solib_start; so->next != NULL; so = so->next)
    if (so->next->load_addr == lpBaseOfDll)
      {
	struct so_stuff *sodel = so->next;
	so->next = sodel->next;
	if (!so->next)
	  solib_end = so;
	if (sodel->objfile)
	  free_objfile (sodel->objfile);
	xfree(sodel);
	return 1;
      }
  error ("Error: dll starting at 0x%lx not found.\n", (DWORD) lpBaseOfDll);

  return 0;
}

char *
solib_address (CORE_ADDR address)
{
  struct so_stuff *so;
  for (so = &solib_start; so->next != NULL; so = so->next)
    if (address >= so->load_addr && address <= so->end_addr)
      return so->name;
  return NULL;
}

/* Return name of last loaded DLL. */
char *
child_solib_loaded_library_pathname (int pid)
{
  return !solib_end || !solib_end->name[0] ? NULL : solib_end->name;
}

/* Clear list of loaded DLLs. */
void
child_clear_solibs (void)
{
  struct so_stuff *so, *so1 = solib_start.next;

  while ((so = so1) != NULL)
    {
      so1 = so->next;
      xfree (so);
    }

  solib_start.next = NULL;
  solib_start.objfile = NULL;
  solib_end = &solib_start;
  max_dll_name_len = sizeof ("DLL Name") - 1;
}

/* Get the loaded address of all sections, given that .text was loaded
   at text_load. Assumes that all sections are subject to the same
   relocation offset. Returns NULL if problems occur or if the
   sections were not relocated. */

static struct section_addr_info *
get_relocated_section_addrs (bfd *abfd, CORE_ADDR text_load)
{
  struct section_addr_info *result = NULL;
  int section_count = bfd_count_sections (abfd);
  asection *text_section = bfd_get_section_by_name (abfd, ".text");
  CORE_ADDR text_vma;

  if (!text_section)
    {
      /* Couldn't get the .text section. Weird. */
    }

  else if (text_load == (text_vma = bfd_get_section_vma (abfd, text_section)))
    {
      /* DLL wasn't relocated. */
    }

  else
    {
      /* Figure out all sections' loaded addresses. The offset here is
	 such that taking a bfd_get_section_vma() result and adding
	 offset will give the real load address of the section. */

      CORE_ADDR offset = text_load - text_vma;

      struct section_table *table_start = NULL;
      struct section_table *table_end = NULL;
      struct section_table *iter = NULL;

      build_section_table (abfd, &table_start, &table_end);

      for (iter = table_start; iter < table_end; ++iter)
	{
	  /* Relocated addresses. */
	  iter->addr += offset;
	  iter->endaddr += offset;
	}

      result = build_section_addr_info_from_section_table (table_start,
							   table_end);

      xfree (table_start);
    }

  return result;
}

/* Add DLL symbol information. */
static struct objfile *
solib_symbols_add (char *name, int from_tty, CORE_ADDR load_addr)
{
  struct section_addr_info *addrs = NULL;
  static struct objfile *result = NULL;
  bfd *abfd = NULL;

  /* The symbols in a dll are offset by 0x1000, which is the
     the offset from 0 of the first byte in an image - because
     of the file header and the section alignment. */

  if (!name || !name[0])
    return NULL;

  abfd = bfd_openr (name, "pei-i386");

  if (!abfd)
    {
      /* pei failed - try pe */
      abfd = bfd_openr (name, "pe-i386");
    }

  if (abfd)
    {
      if (bfd_check_format (abfd, bfd_object))
	{
	  addrs = get_relocated_section_addrs (abfd, load_addr);
	}

      bfd_close (abfd);
    }

  if (addrs)
    {
      result = safe_symbol_file_add (name, from_tty, addrs, 0, OBJF_SHARED);
      free_section_addr_info (addrs);
    }
  else
    {
      /* Fallback on handling just the .text section. */
      struct cleanup *my_cleanups;

      addrs = alloc_section_addr_info (1);
      my_cleanups = make_cleanup (xfree, addrs);
      addrs->other[0].name = ".text";
      addrs->other[0].addr = load_addr;

      result = safe_symbol_file_add (name, from_tty, addrs, 0, OBJF_SHARED);
      do_cleanups (my_cleanups);
    }

  return result;
}

/* Load DLL symbol info. */
void
dll_symbol_command (char *args, int from_tty)
{
  int n;
  dont_repeat ();

  if (args == NULL)
    error ("dll-symbols requires a file name");

  n = strlen (args);
  if (n > 4 && strcasecmp (args + n - 4, ".dll") != 0)
    {
      char *newargs = (char *) alloca (n + 4 + 1);
      strcpy (newargs, args);
      strcat (newargs, ".dll");
      args = newargs;
    }

  safe_symbol_file_add (args, from_tty, NULL, 0, OBJF_SHARED | OBJF_USERLOADED);
}

/* List currently loaded DLLs. */
void
info_dll_command (char *ignore, int from_tty)
{
  struct so_stuff *so = &solib_start;

  if (!so->next)
    return;

  printf_filtered ("%*s  Load Address\n", -max_dll_name_len, "DLL Name");
  while ((so = so->next) != NULL)
    printf_filtered ("%*s  %08lx\n", -max_dll_name_len, so->name, so->load_addr);

  return;
}

/* Handle DEBUG_STRING output from child process.
   Cygwin prepends its messages with a "cygwin:".  Interpret this as
   a Cygwin signal.  Otherwise just print the string as a warning. */
static int
handle_output_debug_string (struct target_waitstatus *ourstatus)
{
  char *s;
  int gotasig = FALSE;

  if (!target_read_string
    ((CORE_ADDR) current_event.u.DebugString.lpDebugStringData, &s, 1024, 0)
      || !s || !*s)
    return gotasig;

  if (strncmp (s, CYGWIN_SIGNAL_STRING, sizeof (CYGWIN_SIGNAL_STRING) - 1) != 0)
    {
      if (strncmp (s, "cYg", 3) != 0)
	warning ("%s", s);
    }
  else
    {
      char *p;
      int sig = strtol (s + sizeof (CYGWIN_SIGNAL_STRING) - 1, &p, 0);
      gotasig = target_signal_from_host (sig);
      ourstatus->value.sig = gotasig;
      if (gotasig)
	ourstatus->kind = TARGET_WAITKIND_STOPPED;
    }

  xfree (s);
  return gotasig;
}

static int
display_selector (HANDLE thread, DWORD sel)
{
  LDT_ENTRY info;
  if (GetThreadSelectorEntry (thread, sel, &info))
    {
      int base, limit;
      printf_filtered ("0x%03lx: ", sel);
      if (!info.HighWord.Bits.Pres)
	{
	  puts_filtered ("Segment not present\n");
	  return 0;
	}
      base = (info.HighWord.Bits.BaseHi << 24) +
	     (info.HighWord.Bits.BaseMid << 16)
	     + info.BaseLow;
      limit = (info.HighWord.Bits.LimitHi << 16) + info.LimitLow;
      if (info.HighWord.Bits.Granularity)
	limit = (limit << 12) | 0xfff;
      printf_filtered ("base=0x%08x limit=0x%08x", base, limit);
      if (info.HighWord.Bits.Default_Big)
	puts_filtered(" 32-bit ");
      else
	puts_filtered(" 16-bit ");
      switch ((info.HighWord.Bits.Type & 0xf) >> 1)
	{
	case 0:
	  puts_filtered ("Data (Read-Only, Exp-up");
	  break;
	case 1:
	  puts_filtered ("Data (Read/Write, Exp-up");
	  break;
	case 2:
	  puts_filtered ("Unused segment (");
	  break;
	case 3:
	  puts_filtered ("Data (Read/Write, Exp-down");
	  break;
	case 4:
	  puts_filtered ("Code (Exec-Only, N.Conf");
	  break;
	case 5:
	  puts_filtered ("Code (Exec/Read, N.Conf");
	  break;
	case 6:
	  puts_filtered ("Code (Exec-Only, Conf");
	  break;
	case 7:
	  puts_filtered ("Code (Exec/Read, Conf");
	  break;
	default:
	  printf_filtered ("Unknown type 0x%x",info.HighWord.Bits.Type);
	}
      if ((info.HighWord.Bits.Type & 0x1) == 0)
	puts_filtered(", N.Acc");
      puts_filtered (")\n");
      if ((info.HighWord.Bits.Type & 0x10) == 0)
	puts_filtered("System selector ");
      printf_filtered ("Priviledge level = %d. ", info.HighWord.Bits.Dpl);
      if (info.HighWord.Bits.Granularity)
	puts_filtered ("Page granular.\n");
      else
	puts_filtered ("Byte granular.\n");
      return 1;
    }
  else
    {
      printf_filtered ("Invalid selector 0x%lx.\n",sel);
      return 0;
    }
}

static void
display_selectors (char * args, int from_tty)
{
  if (!current_thread)
    {
      puts_filtered ("Impossible to display selectors now.\n");
      return;
    }
  if (!args)
    {

      puts_filtered ("Selector $cs\n");
      display_selector (current_thread->h,
	current_thread->context.SegCs);
      puts_filtered ("Selector $ds\n");
      display_selector (current_thread->h,
	current_thread->context.SegDs);
      puts_filtered ("Selector $es\n");
      display_selector (current_thread->h,
	current_thread->context.SegEs);
      puts_filtered ("Selector $ss\n");
      display_selector (current_thread->h,
	current_thread->context.SegSs);
      puts_filtered ("Selector $fs\n");
      display_selector (current_thread->h,
	current_thread->context.SegFs);
      puts_filtered ("Selector $gs\n");
      display_selector (current_thread->h,
	current_thread->context.SegGs);
    }
  else
    {
      int sel;
      sel = parse_and_eval_long (args);
      printf_filtered ("Selector \"%s\"\n",args);
      display_selector (current_thread->h, sel);
    }
}

static struct cmd_list_element *info_w32_cmdlist = NULL;

static void
info_w32_command (char *args, int from_tty)
{
  help_list (info_w32_cmdlist, "info w32 ", class_info, gdb_stdout);
}


#define DEBUG_EXCEPTION_SIMPLE(x)       if (debug_exceptions) \
  printf_unfiltered ("gdb: Target exception %s at 0x%08lx\n", x, \
  (DWORD) current_event.u.Exception.ExceptionRecord.ExceptionAddress)

static int
handle_exception (struct target_waitstatus *ourstatus)
{
  thread_info *th;
  DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode;

  ourstatus->kind = TARGET_WAITKIND_STOPPED;

  /* Record the context of the current thread */
  th = thread_rec (current_event.dwThreadId, -1);

  switch (code)
    {
    case EXCEPTION_ACCESS_VIOLATION:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION");
      ourstatus->value.sig = TARGET_SIGNAL_SEGV;
      break;
    case STATUS_STACK_OVERFLOW:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW");
      ourstatus->value.sig = TARGET_SIGNAL_SEGV;
      break;
    case STATUS_FLOAT_DENORMAL_OPERAND:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_FLOAT_INEXACT_RESULT:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_FLOAT_INVALID_OPERATION:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_FLOAT_OVERFLOW:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_FLOAT_STACK_CHECK:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_FLOAT_UNDERFLOW:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_FLOAT_DIVIDE_BY_ZERO:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_INTEGER_DIVIDE_BY_ZERO:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case STATUS_INTEGER_OVERFLOW:
      DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW");
      ourstatus->value.sig = TARGET_SIGNAL_FPE;
      break;
    case EXCEPTION_BREAKPOINT:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
      ourstatus->value.sig = TARGET_SIGNAL_TRAP;
      break;
    case DBG_CONTROL_C:
      DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C");
      ourstatus->value.sig = TARGET_SIGNAL_INT;
      break;
    case DBG_CONTROL_BREAK:
      DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK");
      ourstatus->value.sig = TARGET_SIGNAL_INT;
      break;
    case EXCEPTION_SINGLE_STEP:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
      ourstatus->value.sig = TARGET_SIGNAL_TRAP;
      break;
    case EXCEPTION_ILLEGAL_INSTRUCTION:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION");
      ourstatus->value.sig = TARGET_SIGNAL_ILL;
      break;
    case EXCEPTION_PRIV_INSTRUCTION:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION");
      ourstatus->value.sig = TARGET_SIGNAL_ILL;
      break;
    case EXCEPTION_NONCONTINUABLE_EXCEPTION:
      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION");
      ourstatus->value.sig = TARGET_SIGNAL_ILL;
      break;
    default:
      if (current_event.u.Exception.dwFirstChance)
	return 0;
      printf_unfiltered ("gdb: unknown target exception 0x%08lx at 0x%08lx\n",
		    current_event.u.Exception.ExceptionRecord.ExceptionCode,
	(DWORD) current_event.u.Exception.ExceptionRecord.ExceptionAddress);
      ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
      break;
    }
  exception_count++;
  last_sig = ourstatus->value.sig;
  return 1;
}

/* Resume all artificially suspended threads if we are continuing
   execution */
static BOOL
child_continue (DWORD continue_status, int id)
{
  int i;
  thread_info *th;
  BOOL res;

  DEBUG_EVENTS (("ContinueDebugEvent (cpid=%ld, ctid=%ld, %s);\n",
		  current_event.dwProcessId, current_event.dwThreadId,
		  continue_status == DBG_CONTINUE ?
		  "DBG_CONTINUE" : "DBG_EXCEPTION_NOT_HANDLED"));
  res = ContinueDebugEvent (current_event.dwProcessId,
			    current_event.dwThreadId,
			    continue_status);
  continue_status = 0;
  if (res)
    for (th = &thread_head; (th = th->next) != NULL;)
      if (((id == -1) || (id == (int) th->id)) && th->suspend_count)
	{

	  for (i = 0; i < th->suspend_count; i++)
	    (void) ResumeThread (th->h);
	  th->suspend_count = 0;
	  if (debug_registers_changed)
	    {
	      /* Only change the value of the debug reisters */
	      th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
	      th->context.Dr0 = dr[0];
	      th->context.Dr1 = dr[1];
	      th->context.Dr2 = dr[2];
	      th->context.Dr3 = dr[3];
	      /* th->context.Dr6 = dr[6];
		 FIXME: should we set dr6 also ?? */
	      th->context.Dr7 = dr[7];
	      CHECK (SetThreadContext (th->h, &th->context));
	      th->context.ContextFlags = 0;
	    }
	}

  debug_registers_changed = 0;
  return res;
}

/* Get the next event from the child.  Return 1 if the event requires
   handling by WFI (or whatever).
 */
static int
get_child_debug_event (int pid, struct target_waitstatus *ourstatus)
{
  BOOL debug_event;
  DWORD continue_status, event_code;
  thread_info *th = NULL;
  static thread_info dummy_thread_info;
  int retval = 0;

  last_sig = TARGET_SIGNAL_0;

  if (!(debug_event = WaitForDebugEvent (&current_event, 1000)))
    goto out;

  event_count++;
  continue_status = DBG_CONTINUE;

  event_code = current_event.dwDebugEventCode;
  ourstatus->kind = TARGET_WAITKIND_SPURIOUS;

  switch (event_code)
    {
    case CREATE_THREAD_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%x code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "CREATE_THREAD_DEBUG_EVENT"));
      if (saw_create != 1)
	break;
      /* Record the existence of this thread */
      th = child_add_thread (current_event.dwThreadId,
			     current_event.u.CreateThread.hThread);
      if (info_verbose)
	printf_unfiltered ("[New %s]\n",
			   target_pid_to_str (
			     pid_to_ptid (current_event.dwThreadId)));
      retval = current_event.dwThreadId;
      break;

    case EXIT_THREAD_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "EXIT_THREAD_DEBUG_EVENT"));
      if (saw_create != 1)
	break;
      child_delete_thread (current_event.dwThreadId);
      th = &dummy_thread_info;
      break;

    case CREATE_PROCESS_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "CREATE_PROCESS_DEBUG_EVENT"));
      CloseHandle (current_event.u.CreateProcessInfo.hFile);
      if (++saw_create != 1)
	{
	  CloseHandle (current_event.u.CreateProcessInfo.hProcess);
	  break;
	}

      current_process_handle = current_event.u.CreateProcessInfo.hProcess;
      main_thread_id = current_event.dwThreadId;
      /* Add the main thread */
#if 0
      th = child_add_thread (current_event.dwProcessId,
			     current_event.u.CreateProcessInfo.hProcess);
#endif
      th = child_add_thread (main_thread_id,
			     current_event.u.CreateProcessInfo.hThread);
      retval = ourstatus->value.related_pid = current_event.dwThreadId;
      break;

    case EXIT_PROCESS_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "EXIT_PROCESS_DEBUG_EVENT"));
      if (saw_create != 1)
	break;
      ourstatus->kind = TARGET_WAITKIND_EXITED;
      ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode;
      CloseHandle (current_process_handle);
      retval = main_thread_id;
      break;

    case LOAD_DLL_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "LOAD_DLL_DEBUG_EVENT"));
      CloseHandle (current_event.u.LoadDll.hFile);
      if (saw_create != 1)
	break;
      catch_errors (handle_load_dll, NULL, (char *) "", RETURN_MASK_ALL);
      registers_changed ();	/* mark all regs invalid */
      ourstatus->kind = TARGET_WAITKIND_LOADED;
      ourstatus->value.integer = 0;
      retval = main_thread_id;
      re_enable_breakpoints_in_shlibs ();
      break;

    case UNLOAD_DLL_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "UNLOAD_DLL_DEBUG_EVENT"));
      if (saw_create != 1)
	break;
      catch_errors (handle_unload_dll, NULL, (char *) "", RETURN_MASK_ALL);
      registers_changed ();	/* mark all regs invalid */
      /* ourstatus->kind = TARGET_WAITKIND_UNLOADED;
	 does not exist yet. */
      break;

    case EXCEPTION_DEBUG_EVENT:
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "EXCEPTION_DEBUG_EVENT"));
      if (saw_create != 1)
	break;
      if (handle_exception (ourstatus))
	retval = current_event.dwThreadId;
      break;

    case OUTPUT_DEBUG_STRING_EVENT:	/* message from the kernel */
      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
		     (unsigned) current_event.dwProcessId,
		     (unsigned) current_event.dwThreadId,
		     "OUTPUT_DEBUG_STRING_EVENT"));
      if (saw_create != 1)
	break;
      if (handle_output_debug_string (ourstatus))
	retval = main_thread_id;
      break;

    default:
      if (saw_create != 1)
	break;
      printf_unfiltered ("gdb: kernel event for pid=%ld tid=%ld\n",
			 (DWORD) current_event.dwProcessId,
			 (DWORD) current_event.dwThreadId);
      printf_unfiltered ("                 unknown event code %ld\n",
			 current_event.dwDebugEventCode);
      break;
    }

  if (!retval || saw_create != 1)
    CHECK (child_continue (continue_status, -1));
  else
    {
      current_thread = th ? : thread_rec (current_event.dwThreadId, TRUE);
      inferior_ptid = pid_to_ptid (retval);
    }

out:
  return retval;
}

/* Wait for interesting events to occur in the target process. */
static ptid_t
child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
{
  int pid = PIDGET (ptid);

  /* We loop when we get a non-standard exception rather than return
     with a SPURIOUS because resume can try and step or modify things,
     which needs a current_thread->h.  But some of these exceptions mark
     the birth or death of threads, which mean that the current thread
     isn't necessarily what you think it is. */

  while (1)
    {
      int retval = get_child_debug_event (pid, ourstatus);
      if (retval)
	return pid_to_ptid (retval);
      else
	{
	  int detach = 0;

	  if (ui_loop_hook != NULL)
	    detach = ui_loop_hook (0);

	  if (detach)
	    child_kill_inferior ();
	}
    }
}

static void
do_initial_child_stuff (DWORD pid)
{
  extern int stop_after_trap;
  int i;

  last_sig = TARGET_SIGNAL_0;
  event_count = 0;
  exception_count = 0;
  debug_registers_changed = 0;
  debug_registers_used = 0;
  for (i = 0; i < sizeof (dr) / sizeof (dr[0]); i++)
    dr[i] = 0;
  current_event.dwProcessId = pid;
  memset (&current_event, 0, sizeof (current_event));
  push_target (&child_ops);
  child_init_thread_list ();
  disable_breakpoints_in_shlibs (1);
  child_clear_solibs ();
  clear_proceed_status ();
  init_wait_for_inferior ();

  target_terminal_init ();
  target_terminal_inferior ();

  while (1)
    {
      stop_after_trap = 1;
      wait_for_inferior ();
      if (stop_signal != TARGET_SIGNAL_TRAP)
	resume (0, stop_signal);
      else
	break;
    }
  stop_after_trap = 0;
  return;
}

/* Since Windows XP, detaching from a process is supported by Windows.
   The following code tries loading the appropriate functions dynamically.
   If loading these functions succeeds use them to actually detach from
   the inferior process, otherwise behave as usual, pretending that
   detach has worked. */
static BOOL WINAPI (*DebugSetProcessKillOnExit)(BOOL);
static BOOL WINAPI (*DebugActiveProcessStop)(DWORD);

static int
has_detach_ability (void)
{
  static HMODULE kernel32 = NULL;

  if (!kernel32)
    kernel32 = LoadLibrary ("kernel32.dll");
  if (kernel32)
    {
      if (!DebugSetProcessKillOnExit)
	DebugSetProcessKillOnExit = GetProcAddress (kernel32,
						 "DebugSetProcessKillOnExit");
      if (!DebugActiveProcessStop)
	DebugActiveProcessStop = GetProcAddress (kernel32,
						 "DebugActiveProcessStop");
      if (DebugSetProcessKillOnExit && DebugActiveProcessStop)
	return 1;
    }
  return 0;
}

/* Try to set or remove a user privilege to the current process.  Return -1
   if that fails, the previous setting of that privilege otherwise.

   This code is copied from the Cygwin source code and rearranged to allow
   dynamically loading of the needed symbols from advapi32 which is only
   available on NT/2K/XP. */
static int
set_process_privilege (const char *privilege, BOOL enable)
{
  static HMODULE advapi32 = NULL;
  static BOOL WINAPI (*OpenProcessToken)(HANDLE, DWORD, PHANDLE);
  static BOOL WINAPI (*LookupPrivilegeValue)(LPCSTR, LPCSTR, PLUID);
  static BOOL WINAPI (*AdjustTokenPrivileges)(HANDLE, BOOL, PTOKEN_PRIVILEGES,
					      DWORD, PTOKEN_PRIVILEGES, PDWORD);

  HANDLE token_hdl = NULL;
  LUID restore_priv;
  TOKEN_PRIVILEGES new_priv, orig_priv;
  int ret = -1;
  DWORD size;

  if (GetVersion () >= 0x80000000)  /* No security availbale on 9x/Me */
    return 0;

  if (!advapi32)
    {
      if (!(advapi32 = LoadLibrary ("advapi32.dll")))
	goto out;
      if (!OpenProcessToken)
	OpenProcessToken = GetProcAddress (advapi32, "OpenProcessToken");
      if (!LookupPrivilegeValue)
	LookupPrivilegeValue = GetProcAddress (advapi32,
					       "LookupPrivilegeValueA");
      if (!AdjustTokenPrivileges)
	AdjustTokenPrivileges = GetProcAddress (advapi32,
						"AdjustTokenPrivileges");
      if (!OpenProcessToken || !LookupPrivilegeValue || !AdjustTokenPrivileges)
	{
	  advapi32 = NULL;
	  goto out;
	}
    }

  if (!OpenProcessToken (GetCurrentProcess (),
			 TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
			 &token_hdl))
    goto out;

  if (!LookupPrivilegeValue (NULL, privilege, &restore_priv))
    goto out;

  new_priv.PrivilegeCount = 1;
  new_priv.Privileges[0].Luid = restore_priv;
  new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;

  if (!AdjustTokenPrivileges (token_hdl, FALSE, &new_priv,
			      sizeof orig_priv, &orig_priv, &size))
    goto out;
#if 0
  /* Disabled, otherwise every `attach' in an unprivileged user session
     would raise the "Failed to get SE_DEBUG_NAME privilege" warning in
     child_attach(). */
  /* AdjustTokenPrivileges returns TRUE even if the privilege could not
     be enabled. GetLastError () returns an correct error code, though. */
  if (enable && GetLastError () == ERROR_NOT_ALL_ASSIGNED)
    goto out;
#endif

  ret = orig_priv.Privileges[0].Attributes == SE_PRIVILEGE_ENABLED ? 1 : 0;

out:
  if (token_hdl)
    CloseHandle (token_hdl);

  return ret;
}

/* Attach to process PID, then initialize for debugging it.  */
static void
child_attach (char *args, int from_tty)
{
  BOOL ok;
  DWORD pid;

  if (!args)
    error_no_arg ("process-id to attach");

  if (set_process_privilege (SE_DEBUG_NAME, TRUE) < 0)
    {
      printf_unfiltered ("Warning: Failed to get SE_DEBUG_NAME privilege\n");
      printf_unfiltered ("This can cause attach to fail on Windows NT/2K/XP\n");
    }

  pid = strtoul (args, 0, 0);		/* Windows pid */

  ok = DebugActiveProcess (pid);
  saw_create = 0;

  if (!ok)
    {
      /* Try fall back to Cygwin pid */
      pid = cygwin_internal (CW_CYGWIN_PID_TO_WINPID, pid);

      if (pid > 0)
	ok = DebugActiveProcess (pid);

      if (!ok)
	error ("Can't attach to process.");
    }

  if (has_detach_ability ())
    {
      attach_flag = 1;
      DebugSetProcessKillOnExit (FALSE);
    }

  if (from_tty)
    {
      char *exec_file = (char *) get_exec_file (0);

      if (exec_file)
	printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
			   target_pid_to_str (pid_to_ptid (pid)));
      else
	printf_unfiltered ("Attaching to %s\n",
			   target_pid_to_str (pid_to_ptid (pid)));

      gdb_flush (gdb_stdout);
    }

  do_initial_child_stuff (pid);
  target_terminal_ours ();
}

static void
child_detach (char *args, int from_tty)
{
  int detached = 1;

  if (has_detach_ability ())
    {
      delete_command (NULL, 0);
      child_continue (DBG_CONTINUE, -1);
      if (!DebugActiveProcessStop (current_event.dwProcessId))
	{
	  error ("Can't detach process %lu (error %lu)",
		 current_event.dwProcessId, GetLastError ());
	  detached = 0;
	}
      DebugSetProcessKillOnExit (FALSE);
    }
  if (detached && from_tty)
    {
      char *exec_file = get_exec_file (0);
      if (exec_file == 0)
	exec_file = "";
      printf_unfiltered ("Detaching from program: %s, Pid %lu\n", exec_file,
			 current_event.dwProcessId);
      gdb_flush (gdb_stdout);
    }
  inferior_ptid = null_ptid;
  unpush_target (&child_ops);
}

/* Print status information about what we're accessing.  */

static void
child_files_info (struct target_ops *ignore)
{
  printf_unfiltered ("\tUsing the running image of %s %s.\n",
      attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid));
}

/* ARGSUSED */
static void
child_open (char *arg, int from_tty)
{
  error ("Use the \"run\" command to start a Unix child process.");
}

/* Start an inferior win32 child process and sets inferior_ptid to its pid.
   EXEC_FILE is the file to run.
   ALLARGS is a string containing the arguments to the program.
   ENV is the environment vector to pass.  Errors reported with error().  */

static void
child_create_inferior (char *exec_file, char *allargs, char **env)
{
  char *winenv;
  char *temp;
  int envlen;
  int i;
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  BOOL ret;
  DWORD flags;
  char *args;
  char real_path[MAXPATHLEN];
  char *toexec;
  char shell[MAX_PATH + 1]; /* Path to shell */
  const char *sh;
  int tty;
  int ostdin, ostdout, ostderr;

  if (!exec_file)
    error ("No executable specified, use `target exec'.\n");

  memset (&si, 0, sizeof (si));
  si.cb = sizeof (si);

  if (!useshell)
    {
      flags = DEBUG_ONLY_THIS_PROCESS;
      cygwin_conv_to_win32_path (exec_file, real_path);
      toexec = real_path;
    }
  else
    {
      char *newallargs;
      sh = getenv ("SHELL");
      if (!sh)
	sh = "/bin/sh";
      cygwin_conv_to_win32_path (sh, shell);
      newallargs = alloca (sizeof (" -c 'exec  '") + strlen (exec_file)
			   + strlen (allargs) + 2);
      sprintf (newallargs, " -c 'exec %s %s'", exec_file, allargs);
      allargs = newallargs;
      toexec = shell;
      flags = DEBUG_PROCESS;
    }

  if (new_group)
    flags |= CREATE_NEW_PROCESS_GROUP;

  if (new_console)
    flags |= CREATE_NEW_CONSOLE;

  args = alloca (strlen (toexec) + strlen (allargs) + 2);
  strcpy (args, toexec);
  strcat (args, " ");
  strcat (args, allargs);

  /* Prepare the environment vars for CreateProcess.  */
  {
    /* This code used to assume all env vars were file names and would
       translate them all to win32 style.  That obviously doesn't work in the
       general case.  The current rule is that we only translate PATH.
       We need to handle PATH because we're about to call CreateProcess and
       it uses PATH to find DLL's.  Fortunately PATH has a well-defined value
       in both posix and win32 environments.  cygwin.dll will change it back
       to posix style if necessary.  */

    static const char *conv_path_names[] =
    {
      "PATH=",
      0
    };

    /* CreateProcess takes the environment list as a null terminated set of
       strings (i.e. two nulls terminate the list).  */

    /* Get total size for env strings.  */
    for (envlen = 0, i = 0; env[i] && *env[i]; i++)
      {
	int j, len;

	for (j = 0; conv_path_names[j]; j++)
	  {
	    len = strlen (conv_path_names[j]);
	    if (strncmp (conv_path_names[j], env[i], len) == 0)
	      {
		if (cygwin_posix_path_list_p (env[i] + len))
		  envlen += len
		    + cygwin_posix_to_win32_path_list_buf_size (env[i] + len);
		else
		  envlen += strlen (env[i]) + 1;
		break;
	      }
	  }
	if (conv_path_names[j] == NULL)
	  envlen += strlen (env[i]) + 1;
      }

    winenv = alloca (envlen + 1);

    /* Copy env strings into new buffer.  */
    for (temp = winenv, i = 0; env[i] && *env[i]; i++)
      {
	int j, len;

	for (j = 0; conv_path_names[j]; j++)
	  {
	    len = strlen (conv_path_names[j]);
	    if (strncmp (conv_path_names[j], env[i], len) == 0)
	      {
		if (cygwin_posix_path_list_p (env[i] + len))
		  {
		    memcpy (temp, env[i], len);
		    cygwin_posix_to_win32_path_list (env[i] + len, temp + len);
		  }
		else
		  strcpy (temp, env[i]);
		break;
	      }
	  }
	if (conv_path_names[j] == NULL)
	  strcpy (temp, env[i]);

	temp += strlen (temp) + 1;
      }

    /* Final nil string to terminate new env.  */
    *temp = 0;
  }

  if (!inferior_io_terminal)
    tty = ostdin = ostdout = ostderr = -1;
  else
    {
      tty = open (inferior_io_terminal, O_RDWR | O_NOCTTY);
      if (tty < 0)
	{
	  print_sys_errmsg (inferior_io_terminal, errno);
	  ostdin = ostdout = ostderr = -1;
	}
      else
	{
	  ostdin = dup (0);
	  ostdout = dup (1);
	  ostderr = dup (2);
	  dup2 (tty, 0);
	  dup2 (tty, 1);
	  dup2 (tty, 2);
	}
    }

  ret = CreateProcess (0,
		       args,	/* command line */
		       NULL,	/* Security */
		       NULL,	/* thread */
		       TRUE,	/* inherit handles */
		       flags,	/* start flags */
		       winenv,
		       NULL,	/* current directory */
		       &si,
		       &pi);
  if (tty >= 0)
    {
      close (tty);
      dup2 (ostdin, 0);
      dup2 (ostdout, 1);
      dup2 (ostderr, 2);
      close (ostdin);
      close (ostdout);
      close (ostderr);
    }

  if (!ret)
    error ("Error creating process %s, (error %d)\n", exec_file, (unsigned) GetLastError ());

  CloseHandle (pi.hThread);
  CloseHandle (pi.hProcess);

  if (useshell && shell[0] != '\0')
    saw_create = -1;
  else
    saw_create = 0;

  do_initial_child_stuff (pi.dwProcessId);

  /* child_continue (DBG_CONTINUE, -1); */
  proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0);
}

static void
child_mourn_inferior (void)
{
  (void) child_continue (DBG_CONTINUE, -1);
  i386_cleanup_dregs();
  unpush_target (&child_ops);
  generic_mourn_inferior ();
}

/* Send a SIGINT to the process group.  This acts just like the user typed a
   ^C on the controlling terminal. */

static void
child_stop (void)
{
  DEBUG_EVENTS (("gdb: GenerateConsoleCtrlEvent (CTRLC_EVENT, 0)\n"));
  CHECK (GenerateConsoleCtrlEvent (CTRL_C_EVENT, current_event.dwProcessId));
  registers_changed ();		/* refresh register state */
}

int
child_xfer_memory (CORE_ADDR memaddr, char *our, int len,
		   int write, struct mem_attrib *mem,
		   struct target_ops *target)
{
  DWORD done = 0;
  if (write)
    {
      DEBUG_MEM (("gdb: write target memory, %d bytes at 0x%08lx\n",
		  len, (DWORD) memaddr));
      if (!WriteProcessMemory (current_process_handle, (LPVOID) memaddr, our,
			       len, &done))
	done = 0;
      FlushInstructionCache (current_process_handle, (LPCVOID) memaddr, len);
    }
  else
    {
      DEBUG_MEM (("gdb: read target memory, %d bytes at 0x%08lx\n",
		  len, (DWORD) memaddr));
      if (!ReadProcessMemory (current_process_handle, (LPCVOID) memaddr, our,
			      len, &done))
	done = 0;
    }
  return done;
}

void
child_kill_inferior (void)
{
  CHECK (TerminateProcess (current_process_handle, 0));

  for (;;)
    {
      if (!child_continue (DBG_CONTINUE, -1))
	break;
      if (!WaitForDebugEvent (&current_event, INFINITE))
	break;
      if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
	break;
    }

  CHECK (CloseHandle (current_process_handle));

  /* this may fail in an attached process so don't check. */
  (void) CloseHandle (current_thread->h);
  target_mourn_inferior ();	/* or just child_mourn_inferior? */
}

void
child_resume (ptid_t ptid, int step, enum target_signal sig)
{
  thread_info *th;
  DWORD continue_status = DBG_CONTINUE;

  int pid = PIDGET (ptid);

  if (sig != TARGET_SIGNAL_0)
    {
      if (current_event.dwDebugEventCode != EXCEPTION_DEBUG_EVENT)
	{
	  DEBUG_EXCEPT(("Cannot continue with signal %d here.\n",sig));
	}
      else if (sig == last_sig)
	continue_status = DBG_EXCEPTION_NOT_HANDLED;
      else
#if 0
/* This code does not seem to work, because
  the kernel does probably not consider changes in the ExceptionRecord
  structure when passing the exception to the inferior.
  Note that this seems possible in the exception handler itself.  */
	{
	  int i;
	  for (i = 0; xlate[i].them != -1; i++)
	    if (xlate[i].us == sig)
	      {
		current_event.u.Exception.ExceptionRecord.ExceptionCode =
		  xlate[i].them;
		continue_status = DBG_EXCEPTION_NOT_HANDLED;
		break;
	      }
	  if (continue_status == DBG_CONTINUE)
	    {
	      DEBUG_EXCEPT(("Cannot continue with signal %d.\n",sig));
	    }
	}
#endif
	DEBUG_EXCEPT(("Can only continue with recieved signal %d.\n",
	  last_sig));
    }

  last_sig = TARGET_SIGNAL_0;

  DEBUG_EXEC (("gdb: child_resume (pid=%d, step=%d, sig=%d);\n",
	       pid, step, sig));

  /* Get context for currently selected thread */
  th = thread_rec (current_event.dwThreadId, FALSE);
  if (th)
    {
      if (step)
	{
	  /* Single step by setting t bit */
	  child_fetch_inferior_registers (PS_REGNUM);
	  th->context.EFlags |= FLAG_TRACE_BIT;
	}

      if (th->context.ContextFlags)
	{
	  if (debug_registers_changed)
	    {
	      th->context.Dr0 = dr[0];
	      th->context.Dr1 = dr[1];
	      th->context.Dr2 = dr[2];
	      th->context.Dr3 = dr[3];
	      /* th->context.Dr6 = dr[6];
	       FIXME: should we set dr6 also ?? */
	      th->context.Dr7 = dr[7];
	    }
	  CHECK (SetThreadContext (th->h, &th->context));
	  th->context.ContextFlags = 0;
	}
    }

  /* Allow continuing with the same signal that interrupted us.
     Otherwise complain. */

  child_continue (continue_status, pid);
}

static void
child_prepare_to_store (void)
{
  /* Do nothing, since we can store individual regs */
}

static int
child_can_run (void)
{
  return 1;
}

static void
child_close (int x)
{
  DEBUG_EVENTS (("gdb: child_close, inferior_ptid=%d\n",
		PIDGET (inferior_ptid)));
}

struct target_ops child_ops;

static void
init_child_ops (void)
{
  child_ops.to_shortname = "child";
  child_ops.to_longname = "Win32 child process";
  child_ops.to_doc = "Win32 child process (started by the \"run\" command).";
  child_ops.to_open = child_open;
  child_ops.to_close = child_close;
  child_ops.to_attach = child_attach;
  child_ops.to_detach = child_detach;
  child_ops.to_resume = child_resume;
  child_ops.to_wait = child_wait;
  child_ops.to_fetch_registers = child_fetch_inferior_registers;
  child_ops.to_store_registers = child_store_inferior_registers;
  child_ops.to_prepare_to_store = child_prepare_to_store;
  child_ops.to_xfer_memory = child_xfer_memory;
  child_ops.to_files_info = child_files_info;
  child_ops.to_insert_breakpoint = memory_insert_breakpoint;
  child_ops.to_remove_breakpoint = memory_remove_breakpoint;
  child_ops.to_terminal_init = terminal_init_inferior;
  child_ops.to_terminal_inferior = terminal_inferior;
  child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
  child_ops.to_terminal_ours = terminal_ours;
  child_ops.to_terminal_save_ours = terminal_save_ours;
  child_ops.to_terminal_info = child_terminal_info;
  child_ops.to_kill = child_kill_inferior;
  child_ops.to_create_inferior = child_create_inferior;
  child_ops.to_mourn_inferior = child_mourn_inferior;
  child_ops.to_can_run = child_can_run;
  child_ops.to_thread_alive = win32_child_thread_alive;
  child_ops.to_pid_to_str = cygwin_pid_to_str;
  child_ops.to_stop = child_stop;
  child_ops.to_stratum = process_stratum;
  child_ops.to_has_all_memory = 1;
  child_ops.to_has_memory = 1;
  child_ops.to_has_stack = 1;
  child_ops.to_has_registers = 1;
  child_ops.to_has_execution = 1;
  child_ops.to_magic = OPS_MAGIC;
}

void
_initialize_win32_nat (void)
{
  struct cmd_list_element *c;

  init_child_ops ();

  c = add_com ("dll-symbols", class_files, dll_symbol_command,
	       "Load dll library symbols from FILE.");
  set_cmd_completer (c, filename_completer);

  add_com_alias ("sharedlibrary", "dll-symbols", class_alias, 1);

  add_show_from_set (add_set_cmd ("shell", class_support, var_boolean,
				  (char *) &useshell,
		 "Set use of shell to start subprocess.",
				  &setlist),
		     &showlist);

  add_show_from_set (add_set_cmd ("new-console", class_support, var_boolean,
				  (char *) &new_console,
		 "Set creation of new console when creating child process.",
				  &setlist),
		     &showlist);

  add_show_from_set (add_set_cmd ("new-group", class_support, var_boolean,
				  (char *) &new_group,
		   "Set creation of new group when creating child process.",
				  &setlist),
		     &showlist);

  add_show_from_set (add_set_cmd ("debugexec", class_support, var_boolean,
				  (char *) &debug_exec,
		       "Set whether to display execution in child process.",
				  &setlist),
		     &showlist);

  add_show_from_set (add_set_cmd ("debugevents", class_support, var_boolean,
				  (char *) &debug_events,
		   "Set whether to display kernel events in child process.",
				  &setlist),
		     &showlist);

  add_show_from_set (add_set_cmd ("debugmemory", class_support, var_boolean,
				  (char *) &debug_memory,
		 "Set whether to display memory accesses in child process.",
				  &setlist),
		     &showlist);

  add_show_from_set (add_set_cmd ("debugexceptions", class_support, var_boolean,
				  (char *) &debug_exceptions,
	       "Set whether to display kernel exceptions in child process.",
				  &setlist),
		     &showlist);

  add_info ("dll", info_dll_command, "Status of loaded DLLs.");
  add_info_alias ("sharedlibrary", "dll", 1);

  add_prefix_cmd ("w32", class_info, info_w32_command,
		  "Print information specific to Win32 debugging.",
		  &info_w32_cmdlist, "info w32 ", 0, &infolist);

  add_cmd ("selector", class_info, display_selectors,
	   "Display selectors infos.",
	   &info_w32_cmdlist);

  add_target (&child_ops);
}

/* Hardware watchpoint support, adapted from go32-nat.c code.  */

/* Pass the address ADDR to the inferior in the I'th debug register.
   Here we just store the address in dr array, the registers will be
   actually set up when child_continue is called.  */
void
cygwin_set_dr (int i, CORE_ADDR addr)
{
  if (i < 0 || i > 3)
    internal_error (__FILE__, __LINE__,
		    "Invalid register %d in cygwin_set_dr.\n", i);
  dr[i] = (unsigned) addr;
  debug_registers_changed = 1;
  debug_registers_used = 1;
}

/* Pass the value VAL to the inferior in the DR7 debug control
   register.  Here we just store the address in D_REGS, the watchpoint
   will be actually set up in child_wait.  */
void
cygwin_set_dr7 (unsigned val)
{
  dr[7] = val;
  debug_registers_changed = 1;
  debug_registers_used = 1;
}

/* Get the value of the DR6 debug status register from the inferior.
   Here we just return the value stored in dr[6]
   by the last call to thread_rec for current_event.dwThreadId id.  */
unsigned
cygwin_get_dr6 (void)
{
  return dr[6];
}


/* Determine if the thread referenced by "pid" is alive
   by "polling" it.  If WaitForSingleObject returns WAIT_OBJECT_0
   it means that the pid has died.  Otherwise it is assumed to be alive. */
static int
win32_child_thread_alive (ptid_t ptid)
{
  int pid = PIDGET (ptid);

  return WaitForSingleObject (thread_rec (pid, FALSE)->h, 0) == WAIT_OBJECT_0 ?
    FALSE : TRUE;
}

/* Convert pid to printable format. */
char *
cygwin_pid_to_str (ptid_t ptid)
{
  static char buf[80];
  int pid = PIDGET (ptid);

  if ((DWORD) pid == current_event.dwProcessId)
    sprintf (buf, "process %d", pid);
  else
    sprintf (buf, "thread %ld.0x%x", current_event.dwProcessId, pid);
  return buf;
}

static int
core_dll_symbols_add (char *dll_name, DWORD base_addr)
{
  struct objfile *objfile;
  char *objfile_basename;
  const char *dll_basename;

  if (!(dll_basename = strrchr (dll_name, '/')))
    dll_basename = dll_name;
  else
    dll_basename++;

  ALL_OBJFILES (objfile)
  {
    objfile_basename = strrchr (objfile->name, '/');

    if (objfile_basename &&
	strcmp (dll_basename, objfile_basename + 1) == 0)
      {
	printf_unfiltered ("%08lx:%s (symbols previously loaded)\n",
			   base_addr, dll_name);
	goto out;
      }
  }

  register_loaded_dll (dll_name, base_addr + 0x1000);
  solib_symbols_add (dll_name, 0, (CORE_ADDR) base_addr + 0x1000);

out:
  return 1;
}

typedef struct
{
  struct target_ops *target;
  bfd_vma addr;
} map_code_section_args;

static void
map_single_dll_code_section (bfd * abfd, asection * sect, void *obj)
{
  int old;
  int update_coreops;
  struct section_table *new_target_sect_ptr;

  map_code_section_args *args = (map_code_section_args *) obj;
  struct target_ops *target = args->target;
  if (sect->flags & SEC_CODE)
    {
      update_coreops = core_ops.to_sections == target->to_sections;

      if (target->to_sections)
	{
	  old = target->to_sections_end - target->to_sections;
	  target->to_sections = (struct section_table *)
	    xrealloc ((char *) target->to_sections,
		      (sizeof (struct section_table)) * (1 + old));
	}
      else
	{
	  old = 0;
	  target->to_sections = (struct section_table *)
	    xmalloc ((sizeof (struct section_table)));
	}
      target->to_sections_end = target->to_sections + (1 + old);

      /* Update the to_sections field in the core_ops structure
	 if needed.  */
      if (update_coreops)
	{
	  core_ops.to_sections = target->to_sections;
	  core_ops.to_sections_end = target->to_sections_end;
	}
      new_target_sect_ptr = target->to_sections + old;
      new_target_sect_ptr->addr = args->addr + bfd_section_vma (abfd, sect);
      new_target_sect_ptr->endaddr = args->addr + bfd_section_vma (abfd, sect) +
	bfd_section_size (abfd, sect);;
      new_target_sect_ptr->the_bfd_section = sect;
      new_target_sect_ptr->bfd = abfd;
    }
}

static int
dll_code_sections_add (const char *dll_name, int base_addr, struct target_ops *target)
{
  bfd *dll_bfd;
  map_code_section_args map_args;
  asection *lowest_sect;
  char *name;
  if (dll_name == NULL || target == NULL)
    return 0;
  name = xstrdup (dll_name);
  dll_bfd = bfd_openr (name, "pei-i386");
  if (dll_bfd == NULL)
    return 0;

  if (bfd_check_format (dll_bfd, bfd_object))
    {
      lowest_sect = bfd_get_section_by_name (dll_bfd, ".text");
      if (lowest_sect == NULL)
	return 0;
      map_args.target = target;
      map_args.addr = base_addr - bfd_section_vma (dll_bfd, lowest_sect);

      bfd_map_over_sections (dll_bfd, &map_single_dll_code_section, (void *) (&map_args));
    }

  return 1;
}

static void
core_section_load_dll_symbols (bfd * abfd, asection * sect, void *obj)
{
  struct target_ops *target = (struct target_ops *) obj;

  DWORD base_addr;

  int dll_name_size;
  char *dll_name = NULL;
  char *buf = NULL;
  struct win32_pstatus *pstatus;
  char *p;

  if (strncmp (sect->name, ".module", 7))
    return;

  buf = (char *) xmalloc (sect->_raw_size + 1);
  if (!buf)
    {
      printf_unfiltered ("memory allocation failed for %s\n", sect->name);
      goto out;
    }
  if (!bfd_get_section_contents (abfd, sect, buf, 0, sect->_raw_size))
    goto out;

  pstatus = (struct win32_pstatus *) buf;

  memmove (&base_addr, &(pstatus->data.module_info.base_address), sizeof (base_addr));
  dll_name_size = pstatus->data.module_info.module_name_size;
  if (offsetof (struct win32_pstatus, data.module_info.module_name) + dll_name_size > sect->_raw_size)
      goto out;

  dll_name = (char *) xmalloc (dll_name_size + 1);
  if (!dll_name)
    {
      printf_unfiltered ("memory allocation failed for %s\n", sect->name);
      goto out;
    }
  strncpy (dll_name, pstatus->data.module_info.module_name, dll_name_size);

  while ((p = strchr (dll_name, '\\')))
    *p = '/';

  if (!core_dll_symbols_add (dll_name, (DWORD) base_addr))
    printf_unfiltered ("%s: Failed to load dll symbols.\n", dll_name);

  if (!dll_code_sections_add (dll_name, (DWORD) base_addr + 0x1000, target))
    printf_unfiltered ("%s: Failed to map dll code sections.\n", dll_name);

out:
  if (buf)
    xfree (buf);
  if (dll_name)
    xfree (dll_name);
  return;
}

void
child_solib_add (char *filename, int from_tty, struct target_ops *target,
		 int readsyms)
{
  if (!readsyms)
    return;
  if (core_bfd)
    {
      child_clear_solibs ();
      bfd_map_over_sections (core_bfd, &core_section_load_dll_symbols, target);
    }
  else
    {
      if (solib_end && solib_end->name)
	     solib_end->objfile = solib_symbols_add (solib_end->name, from_tty,
						solib_end->load_addr);
    }
}

static void
fetch_elf_core_registers (char *core_reg_sect,
			  unsigned core_reg_size,
			  int which,
			  CORE_ADDR reg_addr)
{
  int r;
  if (core_reg_size < sizeof (CONTEXT))
    {
      error ("Core file register section too small (%u bytes).", core_reg_size);
      return;
    }
  for (r = 0; r < NUM_REGS; r++)
    supply_register (r, core_reg_sect + mappings[r]);
}

static struct core_fns win32_elf_core_fns =
{
  bfd_target_elf_flavour,
  default_check_format,
  default_core_sniffer,
  fetch_elf_core_registers,
  NULL
};

void
_initialize_core_win32 (void)
{
  add_core_fns (&win32_elf_core_fns);
}

void
_initialize_check_for_gdb_ini (void)
{
  char *homedir;
  if (inhibit_gdbinit)
    return;

  homedir = getenv ("HOME");
  if (homedir)
    {
      char *p;
      char *oldini = (char *) alloca (strlen (homedir) +
				      sizeof ("/gdb.ini"));
      strcpy (oldini, homedir);
      p = strchr (oldini, '\0');
      if (p > oldini && p[-1] != '/')
	*p++ = '/';
      strcpy (p, "gdb.ini");
      if (access (oldini, 0) == 0)
	{
	  int len = strlen (oldini);
	  char *newini = alloca (len + 1);
	  sprintf (newini, "%.*s.gdbinit",
	    (int) (len - (sizeof ("gdb.ini") - 1)), oldini);
	  warning ("obsolete '%s' found. Rename to '%s'.", oldini, newini);
	}
    }
}