aboutsummaryrefslogtreecommitdiff
path: root/gdb/target.c
blob: ceb71b36cde459d360e811b88e00dd34cb9f1d7f (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
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
/* Select target systems and architectures at runtime for GDB.

   Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   Free Software Foundation, Inc.

   Contributed by Cygnus Support.

   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/>.  */

#include "defs.h"
#include <errno.h>
#include "gdb_string.h"
#include "target.h"
#include "gdbcmd.h"
#include "symtab.h"
#include "inferior.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdb_wait.h"
#include "dcache.h"
#include <signal.h>
#include "regcache.h"
#include "gdb_assert.h"
#include "gdbcore.h"
#include "exceptions.h"
#include "target-descriptions.h"

static void target_info (char *, int);

static void maybe_kill_then_attach (char *, int);

static void kill_or_be_killed (int);

static void default_terminal_info (char *, int);

static int default_region_ok_for_hw_watchpoint (CORE_ADDR, int);

static int nosymbol (char *, CORE_ADDR *);

static void tcomplain (void) ATTR_NORETURN;

static int nomemory (CORE_ADDR, char *, int, int, struct target_ops *);

static int return_zero (void);

static int return_one (void);

static int return_minus_one (void);

void target_ignore (void);

static void target_command (char *, int);

static struct target_ops *find_default_run_target (char *);

static void nosupport_runtime (void);

static LONGEST default_xfer_partial (struct target_ops *ops,
				     enum target_object object,
				     const char *annex, gdb_byte *readbuf,
				     const gdb_byte *writebuf,
				     ULONGEST offset, LONGEST len);

static LONGEST current_xfer_partial (struct target_ops *ops,
				     enum target_object object,
				     const char *annex, gdb_byte *readbuf,
				     const gdb_byte *writebuf,
				     ULONGEST offset, LONGEST len);

static LONGEST target_xfer_partial (struct target_ops *ops,
				    enum target_object object,
				    const char *annex,
				    void *readbuf, const void *writebuf,
				    ULONGEST offset, LONGEST len);

static void init_dummy_target (void);

static struct target_ops debug_target;

static void debug_to_open (char *, int);

static void debug_to_close (int);

static void debug_to_attach (char *, int);

static void debug_to_detach (char *, int);

static void debug_to_resume (ptid_t, int, enum target_signal);

static ptid_t debug_to_wait (ptid_t, struct target_waitstatus *);

static void debug_to_fetch_registers (struct regcache *, int);

static void debug_to_store_registers (struct regcache *, int);

static void debug_to_prepare_to_store (struct regcache *);

static void debug_to_files_info (struct target_ops *);

static int debug_to_insert_breakpoint (struct bp_target_info *);

static int debug_to_remove_breakpoint (struct bp_target_info *);

static int debug_to_can_use_hw_breakpoint (int, int, int);

static int debug_to_insert_hw_breakpoint (struct bp_target_info *);

static int debug_to_remove_hw_breakpoint (struct bp_target_info *);

static int debug_to_insert_watchpoint (CORE_ADDR, int, int);

static int debug_to_remove_watchpoint (CORE_ADDR, int, int);

static int debug_to_stopped_by_watchpoint (void);

static int debug_to_stopped_data_address (struct target_ops *, CORE_ADDR *);

static int debug_to_region_ok_for_hw_watchpoint (CORE_ADDR, int);

static void debug_to_terminal_init (void);

static void debug_to_terminal_inferior (void);

static void debug_to_terminal_ours_for_output (void);

static void debug_to_terminal_save_ours (void);

static void debug_to_terminal_ours (void);

static void debug_to_terminal_info (char *, int);

static void debug_to_kill (void);

static void debug_to_load (char *, int);

static int debug_to_lookup_symbol (char *, CORE_ADDR *);

static void debug_to_mourn_inferior (void);

static int debug_to_can_run (void);

static void debug_to_notice_signals (ptid_t);

static int debug_to_thread_alive (ptid_t);

static void debug_to_stop (void);

/* NOTE: cagney/2004-09-29: Many targets reference this variable in
   wierd and mysterious ways.  Putting the variable here lets those
   wierd and mysterious ways keep building while they are being
   converted to the inferior inheritance structure.  */
struct target_ops deprecated_child_ops;

/* Pointer to array of target architecture structures; the size of the
   array; the current index into the array; the allocated size of the
   array.  */
struct target_ops **target_structs;
unsigned target_struct_size;
unsigned target_struct_index;
unsigned target_struct_allocsize;
#define	DEFAULT_ALLOCSIZE	10

/* The initial current target, so that there is always a semi-valid
   current target.  */

static struct target_ops dummy_target;

/* Top of target stack.  */

static struct target_ops *target_stack;

/* The target structure we are currently using to talk to a process
   or file or whatever "inferior" we have.  */

struct target_ops current_target;

/* Command list for target.  */

static struct cmd_list_element *targetlist = NULL;

/* Nonzero if we are debugging an attached outside process
   rather than an inferior.  */

int attach_flag;

/* Nonzero if we should trust readonly sections from the
   executable when reading memory.  */

static int trust_readonly = 0;

/* Non-zero if we want to see trace of target level stuff.  */

static int targetdebug = 0;
static void
show_targetdebug (struct ui_file *file, int from_tty,
		  struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("Target debugging is %s.\n"), value);
}

static void setup_target_debug (void);

DCACHE *target_dcache;

/* The user just typed 'target' without the name of a target.  */

static void
target_command (char *arg, int from_tty)
{
  fputs_filtered ("Argument required (target name).  Try `help target'\n",
		  gdb_stdout);
}

/* Add a possible target architecture to the list.  */

void
add_target (struct target_ops *t)
{
  /* Provide default values for all "must have" methods.  */
  if (t->to_xfer_partial == NULL)
    t->to_xfer_partial = default_xfer_partial;

  if (!target_structs)
    {
      target_struct_allocsize = DEFAULT_ALLOCSIZE;
      target_structs = (struct target_ops **) xmalloc
	(target_struct_allocsize * sizeof (*target_structs));
    }
  if (target_struct_size >= target_struct_allocsize)
    {
      target_struct_allocsize *= 2;
      target_structs = (struct target_ops **)
	xrealloc ((char *) target_structs,
		  target_struct_allocsize * sizeof (*target_structs));
    }
  target_structs[target_struct_size++] = t;

  if (targetlist == NULL)
    add_prefix_cmd ("target", class_run, target_command, _("\
Connect to a target machine or process.\n\
The first argument is the type or protocol of the target machine.\n\
Remaining arguments are interpreted by the target protocol.  For more\n\
information on the arguments for a particular protocol, type\n\
`help target ' followed by the protocol name."),
		    &targetlist, "target ", 0, &cmdlist);
  add_cmd (t->to_shortname, no_class, t->to_open, t->to_doc, &targetlist);
}

/* Stub functions */

void
target_ignore (void)
{
}

void
target_load (char *arg, int from_tty)
{
  dcache_invalidate (target_dcache);
  (*current_target.to_load) (arg, from_tty);
}

static int
nomemory (CORE_ADDR memaddr, char *myaddr, int len, int write,
	  struct target_ops *t)
{
  errno = EIO;			/* Can't read/write this location */
  return 0;			/* No bytes handled */
}

static void
tcomplain (void)
{
  error (_("You can't do that when your target is `%s'"),
	 current_target.to_shortname);
}

void
noprocess (void)
{
  error (_("You can't do that without a process to debug."));
}

static int
nosymbol (char *name, CORE_ADDR *addrp)
{
  return 1;			/* Symbol does not exist in target env */
}

static void
nosupport_runtime (void)
{
  if (ptid_equal (inferior_ptid, null_ptid))
    noprocess ();
  else
    error (_("No run-time support for this"));
}


static void
default_terminal_info (char *args, int from_tty)
{
  printf_unfiltered (_("No saved terminal information.\n"));
}

/* This is the default target_create_inferior and target_attach function.
   If the current target is executing, it asks whether to kill it off.
   If this function returns without calling error(), it has killed off
   the target, and the operation should be attempted.  */

static void
kill_or_be_killed (int from_tty)
{
  if (target_has_execution)
    {
      printf_unfiltered (_("You are already running a program:\n"));
      target_files_info ();
      if (query ("Kill it? "))
	{
	  target_kill ();
	  if (target_has_execution)
	    error (_("Killing the program did not help."));
	  return;
	}
      else
	{
	  error (_("Program not killed."));
	}
    }
  tcomplain ();
}

static void
maybe_kill_then_attach (char *args, int from_tty)
{
  kill_or_be_killed (from_tty);
  target_attach (args, from_tty);
}

static void
maybe_kill_then_create_inferior (char *exec, char *args, char **env,
				 int from_tty)
{
  kill_or_be_killed (0);
  target_create_inferior (exec, args, env, from_tty);
}

/* Go through the target stack from top to bottom, copying over zero
   entries in current_target, then filling in still empty entries.  In
   effect, we are doing class inheritance through the pushed target
   vectors.

   NOTE: cagney/2003-10-17: The problem with this inheritance, as it
   is currently implemented, is that it discards any knowledge of
   which target an inherited method originally belonged to.
   Consequently, new new target methods should instead explicitly and
   locally search the target stack for the target that can handle the
   request.  */

static void
update_current_target (void)
{
  struct target_ops *t;

  /* First, reset current's contents.  */
  memset (&current_target, 0, sizeof (current_target));

#define INHERIT(FIELD, TARGET) \
      if (!current_target.FIELD) \
	current_target.FIELD = (TARGET)->FIELD

  for (t = target_stack; t; t = t->beneath)
    {
      INHERIT (to_shortname, t);
      INHERIT (to_longname, t);
      INHERIT (to_doc, t);
      INHERIT (to_open, t);
      INHERIT (to_close, t);
      INHERIT (to_attach, t);
      INHERIT (to_post_attach, t);
      INHERIT (to_detach, t);
      /* Do not inherit to_disconnect.  */
      INHERIT (to_resume, t);
      INHERIT (to_wait, t);
      INHERIT (to_fetch_registers, t);
      INHERIT (to_store_registers, t);
      INHERIT (to_prepare_to_store, t);
      INHERIT (deprecated_xfer_memory, t);
      INHERIT (to_files_info, t);
      INHERIT (to_insert_breakpoint, t);
      INHERIT (to_remove_breakpoint, t);
      INHERIT (to_can_use_hw_breakpoint, t);
      INHERIT (to_insert_hw_breakpoint, t);
      INHERIT (to_remove_hw_breakpoint, t);
      INHERIT (to_insert_watchpoint, t);
      INHERIT (to_remove_watchpoint, t);
      INHERIT (to_stopped_data_address, t);
      INHERIT (to_stopped_by_watchpoint, t);
      INHERIT (to_have_steppable_watchpoint, t);
      INHERIT (to_have_continuable_watchpoint, t);
      INHERIT (to_region_ok_for_hw_watchpoint, t);
      INHERIT (to_terminal_init, t);
      INHERIT (to_terminal_inferior, t);
      INHERIT (to_terminal_ours_for_output, t);
      INHERIT (to_terminal_ours, t);
      INHERIT (to_terminal_save_ours, t);
      INHERIT (to_terminal_info, t);
      INHERIT (to_kill, t);
      INHERIT (to_load, t);
      INHERIT (to_lookup_symbol, t);
      INHERIT (to_create_inferior, t);
      INHERIT (to_post_startup_inferior, t);
      INHERIT (to_acknowledge_created_inferior, t);
      INHERIT (to_insert_fork_catchpoint, t);
      INHERIT (to_remove_fork_catchpoint, t);
      INHERIT (to_insert_vfork_catchpoint, t);
      INHERIT (to_remove_vfork_catchpoint, t);
      /* Do not inherit to_follow_fork.  */
      INHERIT (to_insert_exec_catchpoint, t);
      INHERIT (to_remove_exec_catchpoint, t);
      INHERIT (to_reported_exec_events_per_exec_call, t);
      INHERIT (to_has_exited, t);
      INHERIT (to_mourn_inferior, t);
      INHERIT (to_can_run, t);
      INHERIT (to_notice_signals, t);
      INHERIT (to_thread_alive, t);
      INHERIT (to_find_new_threads, t);
      INHERIT (to_pid_to_str, t);
      INHERIT (to_extra_thread_info, t);
      INHERIT (to_stop, t);
      /* Do not inherit to_xfer_partial.  */
      INHERIT (to_rcmd, t);
      INHERIT (to_pid_to_exec_file, t);
      INHERIT (to_log_command, t);
      INHERIT (to_stratum, t);
      INHERIT (to_has_all_memory, t);
      INHERIT (to_has_memory, t);
      INHERIT (to_has_stack, t);
      INHERIT (to_has_registers, t);
      INHERIT (to_has_execution, t);
      INHERIT (to_has_thread_control, t);
      INHERIT (to_sections, t);
      INHERIT (to_sections_end, t);
      INHERIT (to_can_async_p, t);
      INHERIT (to_is_async_p, t);
      INHERIT (to_async, t);
      INHERIT (to_async_mask_value, t);
      INHERIT (to_find_memory_regions, t);
      INHERIT (to_make_corefile_notes, t);
      INHERIT (to_get_thread_local_address, t);
      /* Do not inherit to_read_description.  */
      INHERIT (to_magic, t);
      /* Do not inherit to_memory_map.  */
      /* Do not inherit to_flash_erase.  */
      /* Do not inherit to_flash_done.  */
    }
#undef INHERIT

  /* Clean up a target struct so it no longer has any zero pointers in
     it.  Some entries are defaulted to a method that print an error,
     others are hard-wired to a standard recursive default.  */

#define de_fault(field, value) \
  if (!current_target.field)               \
    current_target.field = value

  de_fault (to_open,
	    (void (*) (char *, int))
	    tcomplain);
  de_fault (to_close,
	    (void (*) (int))
	    target_ignore);
  de_fault (to_attach,
	    maybe_kill_then_attach);
  de_fault (to_post_attach,
	    (void (*) (int))
	    target_ignore);
  de_fault (to_detach,
	    (void (*) (char *, int))
	    target_ignore);
  de_fault (to_resume,
	    (void (*) (ptid_t, int, enum target_signal))
	    noprocess);
  de_fault (to_wait,
	    (ptid_t (*) (ptid_t, struct target_waitstatus *))
	    noprocess);
  de_fault (to_fetch_registers,
	    (void (*) (struct regcache *, int))
	    target_ignore);
  de_fault (to_store_registers,
	    (void (*) (struct regcache *, int))
	    noprocess);
  de_fault (to_prepare_to_store,
	    (void (*) (struct regcache *))
	    noprocess);
  de_fault (deprecated_xfer_memory,
	    (int (*) (CORE_ADDR, gdb_byte *, int, int, struct mem_attrib *, struct target_ops *))
	    nomemory);
  de_fault (to_files_info,
	    (void (*) (struct target_ops *))
	    target_ignore);
  de_fault (to_insert_breakpoint,
	    memory_insert_breakpoint);
  de_fault (to_remove_breakpoint,
	    memory_remove_breakpoint);
  de_fault (to_can_use_hw_breakpoint,
	    (int (*) (int, int, int))
	    return_zero);
  de_fault (to_insert_hw_breakpoint,
	    (int (*) (struct bp_target_info *))
	    return_minus_one);
  de_fault (to_remove_hw_breakpoint,
	    (int (*) (struct bp_target_info *))
	    return_minus_one);
  de_fault (to_insert_watchpoint,
	    (int (*) (CORE_ADDR, int, int))
	    return_minus_one);
  de_fault (to_remove_watchpoint,
	    (int (*) (CORE_ADDR, int, int))
	    return_minus_one);
  de_fault (to_stopped_by_watchpoint,
	    (int (*) (void))
	    return_zero);
  de_fault (to_stopped_data_address,
	    (int (*) (struct target_ops *, CORE_ADDR *))
	    return_zero);
  de_fault (to_region_ok_for_hw_watchpoint,
	    default_region_ok_for_hw_watchpoint);
  de_fault (to_terminal_init,
	    (void (*) (void))
	    target_ignore);
  de_fault (to_terminal_inferior,
	    (void (*) (void))
	    target_ignore);
  de_fault (to_terminal_ours_for_output,
	    (void (*) (void))
	    target_ignore);
  de_fault (to_terminal_ours,
	    (void (*) (void))
	    target_ignore);
  de_fault (to_terminal_save_ours,
	    (void (*) (void))
	    target_ignore);
  de_fault (to_terminal_info,
	    default_terminal_info);
  de_fault (to_kill,
	    (void (*) (void))
	    noprocess);
  de_fault (to_load,
	    (void (*) (char *, int))
	    tcomplain);
  de_fault (to_lookup_symbol,
	    (int (*) (char *, CORE_ADDR *))
	    nosymbol);
  de_fault (to_create_inferior,
	    maybe_kill_then_create_inferior);
  de_fault (to_post_startup_inferior,
	    (void (*) (ptid_t))
	    target_ignore);
  de_fault (to_acknowledge_created_inferior,
	    (void (*) (int))
	    target_ignore);
  de_fault (to_insert_fork_catchpoint,
	    (void (*) (int))
	    tcomplain);
  de_fault (to_remove_fork_catchpoint,
	    (int (*) (int))
	    tcomplain);
  de_fault (to_insert_vfork_catchpoint,
	    (void (*) (int))
	    tcomplain);
  de_fault (to_remove_vfork_catchpoint,
	    (int (*) (int))
	    tcomplain);
  de_fault (to_insert_exec_catchpoint,
	    (void (*) (int))
	    tcomplain);
  de_fault (to_remove_exec_catchpoint,
	    (int (*) (int))
	    tcomplain);
  de_fault (to_reported_exec_events_per_exec_call,
	    (int (*) (void))
	    return_one);
  de_fault (to_has_exited,
	    (int (*) (int, int, int *))
	    return_zero);
  de_fault (to_mourn_inferior,
	    (void (*) (void))
	    noprocess);
  de_fault (to_can_run,
	    return_zero);
  de_fault (to_notice_signals,
	    (void (*) (ptid_t))
	    target_ignore);
  de_fault (to_thread_alive,
	    (int (*) (ptid_t))
	    return_zero);
  de_fault (to_find_new_threads,
	    (void (*) (void))
	    target_ignore);
  de_fault (to_extra_thread_info,
	    (char *(*) (struct thread_info *))
	    return_zero);
  de_fault (to_stop,
	    (void (*) (void))
	    target_ignore);
  current_target.to_xfer_partial = current_xfer_partial;
  de_fault (to_rcmd,
	    (void (*) (char *, struct ui_file *))
	    tcomplain);
  de_fault (to_pid_to_exec_file,
	    (char *(*) (int))
	    return_zero);
  de_fault (to_can_async_p,
	    (int (*) (void))
	    return_zero);
  de_fault (to_is_async_p,
	    (int (*) (void))
	    return_zero);
  de_fault (to_async,
	    (void (*) (void (*) (enum inferior_event_type, void*), void*))
	    tcomplain);
  current_target.to_read_description = NULL;
#undef de_fault

  /* Finally, position the target-stack beneath the squashed
     "current_target".  That way code looking for a non-inherited
     target method can quickly and simply find it.  */
  current_target.beneath = target_stack;

  if (targetdebug)
    setup_target_debug ();
}

/* Mark OPS as a running target.  This reverses the effect
   of target_mark_exited.  */

void
target_mark_running (struct target_ops *ops)
{
  struct target_ops *t;

  for (t = target_stack; t != NULL; t = t->beneath)
    if (t == ops)
      break;
  if (t == NULL)
    internal_error (__FILE__, __LINE__,
		    "Attempted to mark unpushed target \"%s\" as running",
		    ops->to_shortname);

  ops->to_has_execution = 1;
  ops->to_has_all_memory = 1;
  ops->to_has_memory = 1;
  ops->to_has_stack = 1;
  ops->to_has_registers = 1;

  update_current_target ();
}

/* Mark OPS as a non-running target.  This reverses the effect
   of target_mark_running.  */

void
target_mark_exited (struct target_ops *ops)
{
  struct target_ops *t;

  for (t = target_stack; t != NULL; t = t->beneath)
    if (t == ops)
      break;
  if (t == NULL)
    internal_error (__FILE__, __LINE__,
		    "Attempted to mark unpushed target \"%s\" as running",
		    ops->to_shortname);

  ops->to_has_execution = 0;
  ops->to_has_all_memory = 0;
  ops->to_has_memory = 0;
  ops->to_has_stack = 0;
  ops->to_has_registers = 0;

  update_current_target ();
}

/* Push a new target type into the stack of the existing target accessors,
   possibly superseding some of the existing accessors.

   Result is zero if the pushed target ended up on top of the stack,
   nonzero if at least one target is on top of it.

   Rather than allow an empty stack, we always have the dummy target at
   the bottom stratum, so we can call the function vectors without
   checking them.  */

int
push_target (struct target_ops *t)
{
  struct target_ops **cur;

  /* Check magic number.  If wrong, it probably means someone changed
     the struct definition, but not all the places that initialize one.  */
  if (t->to_magic != OPS_MAGIC)
    {
      fprintf_unfiltered (gdb_stderr,
			  "Magic number of %s target struct wrong\n",
			  t->to_shortname);
      internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
    }

  /* Find the proper stratum to install this target in.  */
  for (cur = &target_stack; (*cur) != NULL; cur = &(*cur)->beneath)
    {
      if ((int) (t->to_stratum) >= (int) (*cur)->to_stratum)
	break;
    }

  /* If there's already targets at this stratum, remove them.  */
  /* FIXME: cagney/2003-10-15: I think this should be popping all
     targets to CUR, and not just those at this stratum level.  */
  while ((*cur) != NULL && t->to_stratum == (*cur)->to_stratum)
    {
      /* There's already something at this stratum level.  Close it,
         and un-hook it from the stack.  */
      struct target_ops *tmp = (*cur);
      (*cur) = (*cur)->beneath;
      tmp->beneath = NULL;
      target_close (tmp, 0);
    }

  /* We have removed all targets in our stratum, now add the new one.  */
  t->beneath = (*cur);
  (*cur) = t;

  update_current_target ();

  /* Not on top?  */
  return (t != target_stack);
}

/* Remove a target_ops vector from the stack, wherever it may be.
   Return how many times it was removed (0 or 1).  */

int
unpush_target (struct target_ops *t)
{
  struct target_ops **cur;
  struct target_ops *tmp;

  /* Look for the specified target.  Note that we assume that a target
     can only occur once in the target stack. */

  for (cur = &target_stack; (*cur) != NULL; cur = &(*cur)->beneath)
    {
      if ((*cur) == t)
	break;
    }

  if ((*cur) == NULL)
    return 0;			/* Didn't find target_ops, quit now */

  /* NOTE: cagney/2003-12-06: In '94 the close call was made
     unconditional by moving it to before the above check that the
     target was in the target stack (something about "Change the way
     pushing and popping of targets work to support target overlays
     and inheritance").  This doesn't make much sense - only open
     targets should be closed.  */
  target_close (t, 0);

  /* Unchain the target */
  tmp = (*cur);
  (*cur) = (*cur)->beneath;
  tmp->beneath = NULL;

  update_current_target ();

  return 1;
}

void
pop_target (void)
{
  target_close (&current_target, 0);	/* Let it clean up */
  if (unpush_target (target_stack) == 1)
    return;

  fprintf_unfiltered (gdb_stderr,
		      "pop_target couldn't find target %s\n",
		      current_target.to_shortname);
  internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
}

/* Using the objfile specified in OBJFILE, find the address for the
   current thread's thread-local storage with offset OFFSET.  */
CORE_ADDR
target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset)
{
  volatile CORE_ADDR addr = 0;

  if (target_get_thread_local_address_p ()
      && gdbarch_fetch_tls_load_module_address_p (current_gdbarch))
    {
      ptid_t ptid = inferior_ptid;
      volatile struct gdb_exception ex;

      TRY_CATCH (ex, RETURN_MASK_ALL)
	{
	  CORE_ADDR lm_addr;
	  
	  /* Fetch the load module address for this objfile.  */
	  lm_addr = gdbarch_fetch_tls_load_module_address (current_gdbarch,
	                                                   objfile);
	  /* If it's 0, throw the appropriate exception.  */
	  if (lm_addr == 0)
	    throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR,
			 _("TLS load module not found"));

	  addr = target_get_thread_local_address (ptid, lm_addr, offset);
	}
      /* If an error occurred, print TLS related messages here.  Otherwise,
         throw the error to some higher catcher.  */
      if (ex.reason < 0)
	{
	  int objfile_is_library = (objfile->flags & OBJF_SHARED);

	  switch (ex.error)
	    {
	    case TLS_NO_LIBRARY_SUPPORT_ERROR:
	      error (_("Cannot find thread-local variables in this thread library."));
	      break;
	    case TLS_LOAD_MODULE_NOT_FOUND_ERROR:
	      if (objfile_is_library)
		error (_("Cannot find shared library `%s' in dynamic"
		         " linker's load module list"), objfile->name);
	      else
		error (_("Cannot find executable file `%s' in dynamic"
		         " linker's load module list"), objfile->name);
	      break;
	    case TLS_NOT_ALLOCATED_YET_ERROR:
	      if (objfile_is_library)
		error (_("The inferior has not yet allocated storage for"
		         " thread-local variables in\n"
		         "the shared library `%s'\n"
		         "for %s"),
		       objfile->name, target_pid_to_str (ptid));
	      else
		error (_("The inferior has not yet allocated storage for"
		         " thread-local variables in\n"
		         "the executable `%s'\n"
		         "for %s"),
		       objfile->name, target_pid_to_str (ptid));
	      break;
	    case TLS_GENERIC_ERROR:
	      if (objfile_is_library)
		error (_("Cannot find thread-local storage for %s, "
		         "shared library %s:\n%s"),
		       target_pid_to_str (ptid),
		       objfile->name, ex.message);
	      else
		error (_("Cannot find thread-local storage for %s, "
		         "executable file %s:\n%s"),
		       target_pid_to_str (ptid),
		       objfile->name, ex.message);
	      break;
	    default:
	      throw_exception (ex);
	      break;
	    }
	}
    }
  /* It wouldn't be wrong here to try a gdbarch method, too; finding
     TLS is an ABI-specific thing.  But we don't do that yet.  */
  else
    error (_("Cannot find thread-local variables on this target"));

  return addr;
}

#undef	MIN
#define MIN(A, B) (((A) <= (B)) ? (A) : (B))

/* target_read_string -- read a null terminated string, up to LEN bytes,
   from MEMADDR in target.  Set *ERRNOP to the errno code, or 0 if successful.
   Set *STRING to a pointer to malloc'd memory containing the data; the caller
   is responsible for freeing it.  Return the number of bytes successfully
   read.  */

int
target_read_string (CORE_ADDR memaddr, char **string, int len, int *errnop)
{
  int tlen, origlen, offset, i;
  gdb_byte buf[4];
  int errcode = 0;
  char *buffer;
  int buffer_allocated;
  char *bufptr;
  unsigned int nbytes_read = 0;

  gdb_assert (string);

  /* Small for testing.  */
  buffer_allocated = 4;
  buffer = xmalloc (buffer_allocated);
  bufptr = buffer;

  origlen = len;

  while (len > 0)
    {
      tlen = MIN (len, 4 - (memaddr & 3));
      offset = memaddr & 3;

      errcode = target_read_memory (memaddr & ~3, buf, sizeof buf);
      if (errcode != 0)
	{
	  /* The transfer request might have crossed the boundary to an
	     unallocated region of memory. Retry the transfer, requesting
	     a single byte.  */
	  tlen = 1;
	  offset = 0;
	  errcode = target_read_memory (memaddr, buf, 1);
	  if (errcode != 0)
	    goto done;
	}

      if (bufptr - buffer + tlen > buffer_allocated)
	{
	  unsigned int bytes;
	  bytes = bufptr - buffer;
	  buffer_allocated *= 2;
	  buffer = xrealloc (buffer, buffer_allocated);
	  bufptr = buffer + bytes;
	}

      for (i = 0; i < tlen; i++)
	{
	  *bufptr++ = buf[i + offset];
	  if (buf[i + offset] == '\000')
	    {
	      nbytes_read += i + 1;
	      goto done;
	    }
	}

      memaddr += tlen;
      len -= tlen;
      nbytes_read += tlen;
    }
done:
  *string = buffer;
  if (errnop != NULL)
    *errnop = errcode;
  return nbytes_read;
}

/* Find a section containing ADDR.  */
struct section_table *
target_section_by_addr (struct target_ops *target, CORE_ADDR addr)
{
  struct section_table *secp;
  for (secp = target->to_sections;
       secp < target->to_sections_end;
       secp++)
    {
      if (addr >= secp->addr && addr < secp->endaddr)
	return secp;
    }
  return NULL;
}

/* Perform a partial memory transfer.  The arguments and return
   value are just as for target_xfer_partial.  */

static LONGEST
memory_xfer_partial (struct target_ops *ops, void *readbuf, const void *writebuf,
		     ULONGEST memaddr, LONGEST len)
{
  LONGEST res;
  int reg_len;
  struct mem_region *region;

  /* Zero length requests are ok and require no work.  */
  if (len == 0)
    return 0;

  /* Try the executable file, if "trust-readonly-sections" is set.  */
  if (readbuf != NULL && trust_readonly)
    {
      struct section_table *secp;

      secp = target_section_by_addr (ops, memaddr);
      if (secp != NULL
	  && (bfd_get_section_flags (secp->bfd, secp->the_bfd_section)
	      & SEC_READONLY))
	return xfer_memory (memaddr, readbuf, len, 0, NULL, ops);
    }

  /* Likewise for accesses to unmapped overlay sections.  */
  if (readbuf != NULL && overlay_debugging)
    {
      asection *section = find_pc_overlay (memaddr);
      if (pc_in_unmapped_range (memaddr, section))
	return xfer_memory (memaddr, readbuf, len, 0, NULL, ops);
    }

  /* Try GDB's internal data cache.  */
  region = lookup_mem_region (memaddr);
  /* region->hi == 0 means there's no upper bound.  */
  if (memaddr + len < region->hi || region->hi == 0)
    reg_len = len;
  else
    reg_len = region->hi - memaddr;

  switch (region->attrib.mode)
    {
    case MEM_RO:
      if (writebuf != NULL)
	return -1;
      break;

    case MEM_WO:
      if (readbuf != NULL)
	return -1;
      break;

    case MEM_FLASH:
      /* We only support writing to flash during "load" for now.  */
      if (writebuf != NULL)
	error (_("Writing to flash memory forbidden in this context"));
      break;

    case MEM_NONE:
      return -1;
    }

  if (region->attrib.cache)
    {
      /* FIXME drow/2006-08-09: This call discards OPS, so the raw
	 memory request will start back at current_target.  */
      if (readbuf != NULL)
	res = dcache_xfer_memory (target_dcache, memaddr, readbuf,
				  reg_len, 0);
      else
	/* FIXME drow/2006-08-09: If we're going to preserve const
	   correctness dcache_xfer_memory should take readbuf and
	   writebuf.  */
	res = dcache_xfer_memory (target_dcache, memaddr,
				  (void *) writebuf,
				  reg_len, 1);
      if (res <= 0)
	return -1;
      else
	return res;
    }

  /* If none of those methods found the memory we wanted, fall back
     to a target partial transfer.  Normally a single call to
     to_xfer_partial is enough; if it doesn't recognize an object
     it will call the to_xfer_partial of the next target down.
     But for memory this won't do.  Memory is the only target
     object which can be read from more than one valid target.
     A core file, for instance, could have some of memory but
     delegate other bits to the target below it.  So, we must
     manually try all targets.  */

  do
    {
      res = ops->to_xfer_partial (ops, TARGET_OBJECT_MEMORY, NULL,
				  readbuf, writebuf, memaddr, reg_len);
      if (res > 0)
	return res;

      /* We want to continue past core files to executables, but not
	 past a running target's memory.  */
      if (ops->to_has_all_memory)
	return res;

      ops = ops->beneath;
    }
  while (ops != NULL);

  /* If we still haven't got anything, return the last error.  We
     give up.  */
  return res;
}

static LONGEST
target_xfer_partial (struct target_ops *ops,
		     enum target_object object, const char *annex,
		     void *readbuf, const void *writebuf,
		     ULONGEST offset, LONGEST len)
{
  LONGEST retval;

  gdb_assert (ops->to_xfer_partial != NULL);

  /* If this is a memory transfer, let the memory-specific code
     have a look at it instead.  Memory transfers are more
     complicated.  */
  if (object == TARGET_OBJECT_MEMORY)
    retval = memory_xfer_partial (ops, readbuf, writebuf, offset, len);
  else
    {
      enum target_object raw_object = object;

      /* If this is a raw memory transfer, request the normal
	 memory object from other layers.  */
      if (raw_object == TARGET_OBJECT_RAW_MEMORY)
	raw_object = TARGET_OBJECT_MEMORY;

      retval = ops->to_xfer_partial (ops, raw_object, annex, readbuf,
				     writebuf, offset, len);
    }

  if (targetdebug)
    {
      const unsigned char *myaddr = NULL;

      fprintf_unfiltered (gdb_stdlog,
			  "%s:target_xfer_partial (%d, %s, 0x%lx,  0x%lx,  0x%s, %s) = %s",
			  ops->to_shortname,
			  (int) object,
			  (annex ? annex : "(null)"),
			  (long) readbuf, (long) writebuf,
			  paddr_nz (offset), paddr_d (len), paddr_d (retval));

      if (readbuf)
	myaddr = readbuf;
      if (writebuf)
	myaddr = writebuf;
      if (retval > 0 && myaddr != NULL)
	{
	  int i;

	  fputs_unfiltered (", bytes =", gdb_stdlog);
	  for (i = 0; i < retval; i++)
	    {
	      if ((((long) &(myaddr[i])) & 0xf) == 0)
		{
		  if (targetdebug < 2 && i > 0)
		    {
		      fprintf_unfiltered (gdb_stdlog, " ...");
		      break;
		    }
		  fprintf_unfiltered (gdb_stdlog, "\n");
		}

	      fprintf_unfiltered (gdb_stdlog, " %02x", myaddr[i] & 0xff);
	    }
	}

      fputc_unfiltered ('\n', gdb_stdlog);
    }
  return retval;
}

/* Read LEN bytes of target memory at address MEMADDR, placing the results in
   GDB's memory at MYADDR.  Returns either 0 for success or an errno value
   if any error occurs.

   If an error occurs, no guarantee is made about the contents of the data at
   MYADDR.  In particular, the caller should not depend upon partial reads
   filling the buffer with good data.  There is no way for the caller to know
   how much good data might have been transfered anyway.  Callers that can
   deal with partial reads should call target_read (which will retry until
   it makes no progress, and then return how much was transferred). */

int
target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
{
  if (target_read (&current_target, TARGET_OBJECT_MEMORY, NULL,
		   myaddr, memaddr, len) == len)
    return 0;
  else
    return EIO;
}

int
target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
{
  if (target_write (&current_target, TARGET_OBJECT_MEMORY, NULL,
		    myaddr, memaddr, len) == len)
    return 0;
  else
    return EIO;
}

/* Fetch the target's memory map.  */

VEC(mem_region_s) *
target_memory_map (void)
{
  VEC(mem_region_s) *result;
  struct mem_region *last_one, *this_one;
  int ix;
  struct target_ops *t;

  if (targetdebug)
    fprintf_unfiltered (gdb_stdlog, "target_memory_map ()\n");

  for (t = current_target.beneath; t != NULL; t = t->beneath)
    if (t->to_memory_map != NULL)
      break;

  if (t == NULL)
    return NULL;

  result = t->to_memory_map (t);
  if (result == NULL)
    return NULL;

  qsort (VEC_address (mem_region_s, result),
	 VEC_length (mem_region_s, result),
	 sizeof (struct mem_region), mem_region_cmp);

  /* Check that regions do not overlap.  Simultaneously assign
     a numbering for the "mem" commands to use to refer to
     each region.  */
  last_one = NULL;
  for (ix = 0; VEC_iterate (mem_region_s, result, ix, this_one); ix++)
    {
      this_one->number = ix;

      if (last_one && last_one->hi > this_one->lo)
	{
	  warning (_("Overlapping regions in memory map: ignoring"));
	  VEC_free (mem_region_s, result);
	  return NULL;
	}
      last_one = this_one;
    }

  return result;
}

void
target_flash_erase (ULONGEST address, LONGEST length)
{
  struct target_ops *t;

  for (t = current_target.beneath; t != NULL; t = t->beneath)
    if (t->to_flash_erase != NULL)
	{
	  if (targetdebug)
	    fprintf_unfiltered (gdb_stdlog, "target_flash_erase (%s, %s)\n",
                                paddr (address), phex (length, 0));
	  t->to_flash_erase (t, address, length);
	  return;
	}

  tcomplain ();
}

void
target_flash_done (void)
{
  struct target_ops *t;

  for (t = current_target.beneath; t != NULL; t = t->beneath)
    if (t->to_flash_done != NULL)
	{
	  if (targetdebug)
	    fprintf_unfiltered (gdb_stdlog, "target_flash_done\n");
	  t->to_flash_done (t);
	  return;
	}

  tcomplain ();
}

#ifndef target_stopped_data_address_p
int
target_stopped_data_address_p (struct target_ops *target)
{
  if (target->to_stopped_data_address
      == (int (*) (struct target_ops *, CORE_ADDR *)) return_zero)
    return 0;
  if (target->to_stopped_data_address == debug_to_stopped_data_address
      && (debug_target.to_stopped_data_address
	  == (int (*) (struct target_ops *, CORE_ADDR *)) return_zero))
    return 0;
  return 1;
}
#endif

static void
show_trust_readonly (struct ui_file *file, int from_tty,
		     struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Mode for reading from readonly sections is %s.\n"),
		    value);
}

/* More generic transfers.  */

static LONGEST
default_xfer_partial (struct target_ops *ops, enum target_object object,
		      const char *annex, gdb_byte *readbuf,
		      const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
  if (object == TARGET_OBJECT_MEMORY
      && ops->deprecated_xfer_memory != NULL)
    /* If available, fall back to the target's
       "deprecated_xfer_memory" method.  */
    {
      int xfered = -1;
      errno = 0;
      if (writebuf != NULL)
	{
	  void *buffer = xmalloc (len);
	  struct cleanup *cleanup = make_cleanup (xfree, buffer);
	  memcpy (buffer, writebuf, len);
	  xfered = ops->deprecated_xfer_memory (offset, buffer, len,
						1/*write*/, NULL, ops);
	  do_cleanups (cleanup);
	}
      if (readbuf != NULL)
	xfered = ops->deprecated_xfer_memory (offset, readbuf, len, 
					      0/*read*/, NULL, ops);
      if (xfered > 0)
	return xfered;
      else if (xfered == 0 && errno == 0)
	/* "deprecated_xfer_memory" uses 0, cross checked against
           ERRNO as one indication of an error.  */
	return 0;
      else
	return -1;
    }
  else if (ops->beneath != NULL)
    return ops->beneath->to_xfer_partial (ops->beneath, object, annex,
					  readbuf, writebuf, offset, len);
  else
    return -1;
}

/* The xfer_partial handler for the topmost target.  Unlike the default,
   it does not need to handle memory specially; it just passes all
   requests down the stack.  */

static LONGEST
current_xfer_partial (struct target_ops *ops, enum target_object object,
		      const char *annex, gdb_byte *readbuf,
		      const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
  if (ops->beneath != NULL)
    return ops->beneath->to_xfer_partial (ops->beneath, object, annex,
					  readbuf, writebuf, offset, len);
  else
    return -1;
}

/* Target vector read/write partial wrapper functions.

   NOTE: cagney/2003-10-21: I wonder if having "to_xfer_partial
   (inbuf, outbuf)", instead of separate read/write methods, make life
   easier.  */

static LONGEST
target_read_partial (struct target_ops *ops,
		     enum target_object object,
		     const char *annex, gdb_byte *buf,
		     ULONGEST offset, LONGEST len)
{
  return target_xfer_partial (ops, object, annex, buf, NULL, offset, len);
}

static LONGEST
target_write_partial (struct target_ops *ops,
		      enum target_object object,
		      const char *annex, const gdb_byte *buf,
		      ULONGEST offset, LONGEST len)
{
  return target_xfer_partial (ops, object, annex, NULL, buf, offset, len);
}

/* Wrappers to perform the full transfer.  */
LONGEST
target_read (struct target_ops *ops,
	     enum target_object object,
	     const char *annex, gdb_byte *buf,
	     ULONGEST offset, LONGEST len)
{
  LONGEST xfered = 0;
  while (xfered < len)
    {
      LONGEST xfer = target_read_partial (ops, object, annex,
					  (gdb_byte *) buf + xfered,
					  offset + xfered, len - xfered);
      /* Call an observer, notifying them of the xfer progress?  */
      if (xfer == 0)
	return xfered;
      if (xfer < 0)
	return -1;
      xfered += xfer;
      QUIT;
    }
  return len;
}

/* An alternative to target_write with progress callbacks.  */

LONGEST
target_write_with_progress (struct target_ops *ops,
			    enum target_object object,
			    const char *annex, const gdb_byte *buf,
			    ULONGEST offset, LONGEST len,
			    void (*progress) (ULONGEST, void *), void *baton)
{
  LONGEST xfered = 0;

  /* Give the progress callback a chance to set up.  */
  if (progress)
    (*progress) (0, baton);

  while (xfered < len)
    {
      LONGEST xfer = target_write_partial (ops, object, annex,
					   (gdb_byte *) buf + xfered,
					   offset + xfered, len - xfered);

      if (xfer == 0)
	return xfered;
      if (xfer < 0)
	return -1;

      if (progress)
	(*progress) (xfer, baton);

      xfered += xfer;
      QUIT;
    }
  return len;
}

LONGEST
target_write (struct target_ops *ops,
	      enum target_object object,
	      const char *annex, const gdb_byte *buf,
	      ULONGEST offset, LONGEST len)
{
  return target_write_with_progress (ops, object, annex, buf, offset, len,
				     NULL, NULL);
}

/* Read OBJECT/ANNEX using OPS.  Store the result in *BUF_P and return
   the size of the transferred data.  PADDING additional bytes are
   available in *BUF_P.  This is a helper function for
   target_read_alloc; see the declaration of that function for more
   information.  */

static LONGEST
target_read_alloc_1 (struct target_ops *ops, enum target_object object,
		     const char *annex, gdb_byte **buf_p, int padding)
{
  size_t buf_alloc, buf_pos;
  gdb_byte *buf;
  LONGEST n;

  /* This function does not have a length parameter; it reads the
     entire OBJECT).  Also, it doesn't support objects fetched partly
     from one target and partly from another (in a different stratum,
     e.g. a core file and an executable).  Both reasons make it
     unsuitable for reading memory.  */
  gdb_assert (object != TARGET_OBJECT_MEMORY);

  /* Start by reading up to 4K at a time.  The target will throttle
     this number down if necessary.  */
  buf_alloc = 4096;
  buf = xmalloc (buf_alloc);
  buf_pos = 0;
  while (1)
    {
      n = target_read_partial (ops, object, annex, &buf[buf_pos],
			       buf_pos, buf_alloc - buf_pos - padding);
      if (n < 0)
	{
	  /* An error occurred.  */
	  xfree (buf);
	  return -1;
	}
      else if (n == 0)
	{
	  /* Read all there was.  */
	  if (buf_pos == 0)
	    xfree (buf);
	  else
	    *buf_p = buf;
	  return buf_pos;
	}

      buf_pos += n;

      /* If the buffer is filling up, expand it.  */
      if (buf_alloc < buf_pos * 2)
	{
	  buf_alloc *= 2;
	  buf = xrealloc (buf, buf_alloc);
	}

      QUIT;
    }
}

/* Read OBJECT/ANNEX using OPS.  Store the result in *BUF_P and return
   the size of the transferred data.  See the declaration in "target.h"
   function for more information about the return value.  */

LONGEST
target_read_alloc (struct target_ops *ops, enum target_object object,
		   const char *annex, gdb_byte **buf_p)
{
  return target_read_alloc_1 (ops, object, annex, buf_p, 0);
}

/* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
   returned as a string, allocated using xmalloc.  If an error occurs
   or the transfer is unsupported, NULL is returned.  Empty objects
   are returned as allocated but empty strings.  A warning is issued
   if the result contains any embedded NUL bytes.  */

char *
target_read_stralloc (struct target_ops *ops, enum target_object object,
		      const char *annex)
{
  gdb_byte *buffer;
  LONGEST transferred;

  transferred = target_read_alloc_1 (ops, object, annex, &buffer, 1);

  if (transferred < 0)
    return NULL;

  if (transferred == 0)
    return xstrdup ("");

  buffer[transferred] = 0;
  if (strlen (buffer) < transferred)
    warning (_("target object %d, annex %s, "
	       "contained unexpected null characters"),
	     (int) object, annex ? annex : "(none)");

  return (char *) buffer;
}

/* Memory transfer methods.  */

void
get_target_memory (struct target_ops *ops, CORE_ADDR addr, gdb_byte *buf,
		   LONGEST len)
{
  if (target_read (ops, TARGET_OBJECT_MEMORY, NULL, buf, addr, len)
      != len)
    memory_error (EIO, addr);
}

ULONGEST
get_target_memory_unsigned (struct target_ops *ops,
			    CORE_ADDR addr, int len)
{
  gdb_byte buf[sizeof (ULONGEST)];

  gdb_assert (len <= sizeof (buf));
  get_target_memory (ops, addr, buf, len);
  return extract_unsigned_integer (buf, len);
}

static void
target_info (char *args, int from_tty)
{
  struct target_ops *t;
  int has_all_mem = 0;

  if (symfile_objfile != NULL)
    printf_unfiltered (_("Symbols from \"%s\".\n"), symfile_objfile->name);

  for (t = target_stack; t != NULL; t = t->beneath)
    {
      if (!t->to_has_memory)
	continue;

      if ((int) (t->to_stratum) <= (int) dummy_stratum)
	continue;
      if (has_all_mem)
	printf_unfiltered (_("\tWhile running this, GDB does not access memory from...\n"));
      printf_unfiltered ("%s:\n", t->to_longname);
      (t->to_files_info) (t);
      has_all_mem = t->to_has_all_memory;
    }
}

/* This function is called before any new inferior is created, e.g.
   by running a program, attaching, or connecting to a target.
   It cleans up any state from previous invocations which might
   change between runs.  This is a subset of what target_preopen
   resets (things which might change between targets).  */

void
target_pre_inferior (int from_tty)
{
  invalidate_target_mem_regions ();

  target_clear_description ();
}

/* This is to be called by the open routine before it does
   anything.  */

void
target_preopen (int from_tty)
{
  dont_repeat ();

  if (target_has_execution)
    {
      if (!from_tty
          || query (_("A program is being debugged already.  Kill it? ")))
	target_kill ();
      else
	error (_("Program not killed."));
    }

  /* Calling target_kill may remove the target from the stack.  But if
     it doesn't (which seems like a win for UDI), remove it now.  */

  if (target_has_execution)
    pop_target ();

  target_pre_inferior (from_tty);
}

/* Detach a target after doing deferred register stores.  */

void
target_detach (char *args, int from_tty)
{
  (current_target.to_detach) (args, from_tty);
}

void
target_disconnect (char *args, int from_tty)
{
  struct target_ops *t;

  for (t = current_target.beneath; t != NULL; t = t->beneath)
    if (t->to_disconnect != NULL)
	{
	  if (targetdebug)
	    fprintf_unfiltered (gdb_stdlog, "target_disconnect (%s, %d)\n",
				args, from_tty);
	  t->to_disconnect (t, args, from_tty);
	  return;
	}

  tcomplain ();
}

int
target_async_mask (int mask)
{
  int saved_async_masked_status = target_async_mask_value;
  target_async_mask_value = mask;
  return saved_async_masked_status;
}

/* Look through the list of possible targets for a target that can
   follow forks.  */

int
target_follow_fork (int follow_child)
{
  struct target_ops *t;

  for (t = current_target.beneath; t != NULL; t = t->beneath)
    {
      if (t->to_follow_fork != NULL)
	{
	  int retval = t->to_follow_fork (t, follow_child);
	  if (targetdebug)
	    fprintf_unfiltered (gdb_stdlog, "target_follow_fork (%d) = %d\n",
				follow_child, retval);
	  return retval;
	}
    }

  /* Some target returned a fork event, but did not know how to follow it.  */
  internal_error (__FILE__, __LINE__,
		  "could not find a target to follow fork");
}

/* Look for a target which can describe architectural features, starting
   from TARGET.  If we find one, return its description.  */

const struct target_desc *
target_read_description (struct target_ops *target)
{
  struct target_ops *t;

  for (t = target; t != NULL; t = t->beneath)
    if (t->to_read_description != NULL)
      {
	const struct target_desc *tdesc;

	tdesc = t->to_read_description (t);
	if (tdesc)
	  return tdesc;
      }

  return NULL;
}

/* Look through the currently pushed targets.  If none of them will
   be able to restart the currently running process, issue an error
   message.  */

void
target_require_runnable (void)
{
  struct target_ops *t;

  for (t = target_stack; t != NULL; t = t->beneath)
    {
      /* If this target knows how to create a new program, then
	 assume we will still be able to after killing the current
	 one.  Either killing and mourning will not pop T, or else
	 find_default_run_target will find it again.  */
      if (t->to_create_inferior != NULL)
	return;

      /* Do not worry about thread_stratum targets that can not
	 create inferiors.  Assume they will be pushed again if
	 necessary, and continue to the process_stratum.  */
      if (t->to_stratum == thread_stratum)
	continue;

      error (_("\
The \"%s\" target does not support \"run\".  Try \"help target\" or \"continue\"."),
	     t->to_shortname);
    }

  /* This function is only called if the target is running.  In that
     case there should have been a process_stratum target and it
     should either know how to create inferiors, or not... */
  internal_error (__FILE__, __LINE__, "No targets found");
}

/* Look through the list of possible targets for a target that can
   execute a run or attach command without any other data.  This is
   used to locate the default process stratum.

   Result is always valid (error() is called for errors).  */

static struct target_ops *
find_default_run_target (char *do_mesg)
{
  struct target_ops **t;
  struct target_ops *runable = NULL;
  int count;

  count = 0;

  for (t = target_structs; t < target_structs + target_struct_size;
       ++t)
    {
      if ((*t)->to_can_run && target_can_run (*t))
	{
	  runable = *t;
	  ++count;
	}
    }

  if (count != 1)
    error (_("Don't know how to %s.  Try \"help target\"."), do_mesg);

  return runable;
}

void
find_default_attach (char *args, int from_tty)
{
  struct target_ops *t;

  t = find_default_run_target ("attach");
  (t->to_attach) (args, from_tty);
  return;
}

void
find_default_create_inferior (char *exec_file, char *allargs, char **env,
			      int from_tty)
{
  struct target_ops *t;

  t = find_default_run_target ("run");
  (t->to_create_inferior) (exec_file, allargs, env, from_tty);
  return;
}

static int
default_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
  return (len <= TYPE_LENGTH (builtin_type_void_data_ptr));
}

static int
return_zero (void)
{
  return 0;
}

static int
return_one (void)
{
  return 1;
}

static int
return_minus_one (void)
{
  return -1;
}

/*
 * Resize the to_sections pointer.  Also make sure that anyone that
 * was holding on to an old value of it gets updated.
 * Returns the old size.
 */

int
target_resize_to_sections (struct target_ops *target, int num_added)
{
  struct target_ops **t;
  struct section_table *old_value;
  int old_count;

  old_value = target->to_sections;

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

  /* Check to see if anyone else was pointing to this structure.
     If old_value was null, then no one was. */

  if (old_value)
    {
      for (t = target_structs; t < target_structs + target_struct_size;
	   ++t)
	{
	  if ((*t)->to_sections == old_value)
	    {
	      (*t)->to_sections = target->to_sections;
	      (*t)->to_sections_end = target->to_sections_end;
	    }
	}
      /* There is a flattened view of the target stack in current_target,
	 so its to_sections pointer might also need updating. */
      if (current_target.to_sections == old_value)
	{
	  current_target.to_sections = target->to_sections;
	  current_target.to_sections_end = target->to_sections_end;
	}
    }

  return old_count;

}

/* Remove all target sections taken from ABFD.

   Scan the current target stack for targets whose section tables
   refer to sections from BFD, and remove those sections.  We use this
   when we notice that the inferior has unloaded a shared object, for
   example.  */
void
remove_target_sections (bfd *abfd)
{
  struct target_ops **t;

  for (t = target_structs; t < target_structs + target_struct_size; t++)
    {
      struct section_table *src, *dest;

      dest = (*t)->to_sections;
      for (src = (*t)->to_sections; src < (*t)->to_sections_end; src++)
	if (src->bfd != abfd)
	  {
	    /* Keep this section.  */
	    if (dest < src) *dest = *src;
	    dest++;
	  }

      /* If we've dropped any sections, resize the section table.  */
      if (dest < src)
	target_resize_to_sections (*t, dest - src);
    }
}




/* Find a single runnable target in the stack and return it.  If for
   some reason there is more than one, return NULL.  */

struct target_ops *
find_run_target (void)
{
  struct target_ops **t;
  struct target_ops *runable = NULL;
  int count;

  count = 0;

  for (t = target_structs; t < target_structs + target_struct_size; ++t)
    {
      if ((*t)->to_can_run && target_can_run (*t))
	{
	  runable = *t;
	  ++count;
	}
    }

  return (count == 1 ? runable : NULL);
}

/* Find a single core_stratum target in the list of targets and return it.
   If for some reason there is more than one, return NULL.  */

struct target_ops *
find_core_target (void)
{
  struct target_ops **t;
  struct target_ops *runable = NULL;
  int count;

  count = 0;

  for (t = target_structs; t < target_structs + target_struct_size;
       ++t)
    {
      if ((*t)->to_stratum == core_stratum)
	{
	  runable = *t;
	  ++count;
	}
    }

  return (count == 1 ? runable : NULL);
}

/*
 * Find the next target down the stack from the specified target.
 */

struct target_ops *
find_target_beneath (struct target_ops *t)
{
  return t->beneath;
}


/* The inferior process has died.  Long live the inferior!  */

void
generic_mourn_inferior (void)
{
  extern int show_breakpoint_hit_counts;

  inferior_ptid = null_ptid;
  attach_flag = 0;
  breakpoint_init_inferior (inf_exited);
  registers_changed ();

  reopen_exec_file ();
  reinit_frame_cache ();

  /* It is confusing to the user for ignore counts to stick around
     from previous runs of the inferior.  So clear them.  */
  /* However, it is more confusing for the ignore counts to disappear when
     using hit counts.  So don't clear them if we're counting hits.  */
  if (!show_breakpoint_hit_counts)
    breakpoint_clear_ignore_counts ();

  if (deprecated_detach_hook)
    deprecated_detach_hook ();
}

/* Helper function for child_wait and the derivatives of child_wait.
   HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
   translation of that in OURSTATUS.  */
void
store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus)
{
  if (WIFEXITED (hoststatus))
    {
      ourstatus->kind = TARGET_WAITKIND_EXITED;
      ourstatus->value.integer = WEXITSTATUS (hoststatus);
    }
  else if (!WIFSTOPPED (hoststatus))
    {
      ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
      ourstatus->value.sig = target_signal_from_host (WTERMSIG (hoststatus));
    }
  else
    {
      ourstatus->kind = TARGET_WAITKIND_STOPPED;
      ourstatus->value.sig = target_signal_from_host (WSTOPSIG (hoststatus));
    }
}

/* Returns zero to leave the inferior alone, one to interrupt it.  */
int (*target_activity_function) (void);
int target_activity_fd;

/* Convert a normal process ID to a string.  Returns the string in a
   static buffer.  */

char *
normal_pid_to_str (ptid_t ptid)
{
  static char buf[32];

  xsnprintf (buf, sizeof buf, "process %d", ptid_get_pid (ptid));
  return buf;
}

/* Error-catcher for target_find_memory_regions */
static int dummy_find_memory_regions (int (*ignore1) (), void *ignore2)
{
  error (_("No target."));
  return 0;
}

/* Error-catcher for target_make_corefile_notes */
static char * dummy_make_corefile_notes (bfd *ignore1, int *ignore2)
{
  error (_("No target."));
  return NULL;
}

/* Set up the handful of non-empty slots needed by the dummy target
   vector.  */

static void
init_dummy_target (void)
{
  dummy_target.to_shortname = "None";
  dummy_target.to_longname = "None";
  dummy_target.to_doc = "";
  dummy_target.to_attach = find_default_attach;
  dummy_target.to_create_inferior = find_default_create_inferior;
  dummy_target.to_pid_to_str = normal_pid_to_str;
  dummy_target.to_stratum = dummy_stratum;
  dummy_target.to_find_memory_regions = dummy_find_memory_regions;
  dummy_target.to_make_corefile_notes = dummy_make_corefile_notes;
  dummy_target.to_xfer_partial = default_xfer_partial;
  dummy_target.to_magic = OPS_MAGIC;
}

static void
debug_to_open (char *args, int from_tty)
{
  debug_target.to_open (args, from_tty);

  fprintf_unfiltered (gdb_stdlog, "target_open (%s, %d)\n", args, from_tty);
}

static void
debug_to_close (int quitting)
{
  target_close (&debug_target, quitting);
  fprintf_unfiltered (gdb_stdlog, "target_close (%d)\n", quitting);
}

void
target_close (struct target_ops *targ, int quitting)
{
  if (targ->to_xclose != NULL)
    targ->to_xclose (targ, quitting);
  else if (targ->to_close != NULL)
    targ->to_close (quitting);
}

static void
debug_to_attach (char *args, int from_tty)
{
  debug_target.to_attach (args, from_tty);

  fprintf_unfiltered (gdb_stdlog, "target_attach (%s, %d)\n", args, from_tty);
}


static void
debug_to_post_attach (int pid)
{
  debug_target.to_post_attach (pid);

  fprintf_unfiltered (gdb_stdlog, "target_post_attach (%d)\n", pid);
}

static void
debug_to_detach (char *args, int from_tty)
{
  debug_target.to_detach (args, from_tty);

  fprintf_unfiltered (gdb_stdlog, "target_detach (%s, %d)\n", args, from_tty);
}

static void
debug_to_resume (ptid_t ptid, int step, enum target_signal siggnal)
{
  debug_target.to_resume (ptid, step, siggnal);

  fprintf_unfiltered (gdb_stdlog, "target_resume (%d, %s, %s)\n", PIDGET (ptid),
		      step ? "step" : "continue",
		      target_signal_to_name (siggnal));
}

static ptid_t
debug_to_wait (ptid_t ptid, struct target_waitstatus *status)
{
  ptid_t retval;

  retval = debug_target.to_wait (ptid, status);

  fprintf_unfiltered (gdb_stdlog,
		      "target_wait (%d, status) = %d,   ", PIDGET (ptid),
		      PIDGET (retval));
  fprintf_unfiltered (gdb_stdlog, "status->kind = ");
  switch (status->kind)
    {
    case TARGET_WAITKIND_EXITED:
      fprintf_unfiltered (gdb_stdlog, "exited, status = %d\n",
			  status->value.integer);
      break;
    case TARGET_WAITKIND_STOPPED:
      fprintf_unfiltered (gdb_stdlog, "stopped, signal = %s\n",
			  target_signal_to_name (status->value.sig));
      break;
    case TARGET_WAITKIND_SIGNALLED:
      fprintf_unfiltered (gdb_stdlog, "signalled, signal = %s\n",
			  target_signal_to_name (status->value.sig));
      break;
    case TARGET_WAITKIND_LOADED:
      fprintf_unfiltered (gdb_stdlog, "loaded\n");
      break;
    case TARGET_WAITKIND_FORKED:
      fprintf_unfiltered (gdb_stdlog, "forked\n");
      break;
    case TARGET_WAITKIND_VFORKED:
      fprintf_unfiltered (gdb_stdlog, "vforked\n");
      break;
    case TARGET_WAITKIND_EXECD:
      fprintf_unfiltered (gdb_stdlog, "execd\n");
      break;
    case TARGET_WAITKIND_SPURIOUS:
      fprintf_unfiltered (gdb_stdlog, "spurious\n");
      break;
    default:
      fprintf_unfiltered (gdb_stdlog, "unknown???\n");
      break;
    }

  return retval;
}

static void
debug_print_register (const char * func,
		      struct regcache *regcache, int regno)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  fprintf_unfiltered (gdb_stdlog, "%s ", func);
  if (regno >= 0 && regno < gdbarch_num_regs (gdbarch)
			    + gdbarch_num_pseudo_regs (gdbarch)
      && gdbarch_register_name (gdbarch, regno) != NULL
      && gdbarch_register_name (gdbarch, regno)[0] != '\0')
    fprintf_unfiltered (gdb_stdlog, "(%s)",
			gdbarch_register_name (gdbarch, regno));
  else
    fprintf_unfiltered (gdb_stdlog, "(%d)", regno);
  if (regno >= 0)
    {
      int i, size = register_size (gdbarch, regno);
      unsigned char buf[MAX_REGISTER_SIZE];
      regcache_cooked_read (regcache, regno, buf);
      fprintf_unfiltered (gdb_stdlog, " = ");
      for (i = 0; i < size; i++)
	{
	  fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
	}
      if (size <= sizeof (LONGEST))
	{
	  ULONGEST val = extract_unsigned_integer (buf, size);
	  fprintf_unfiltered (gdb_stdlog, " 0x%s %s",
			      paddr_nz (val), paddr_d (val));
	}
    }
  fprintf_unfiltered (gdb_stdlog, "\n");
}

static void
debug_to_fetch_registers (struct regcache *regcache, int regno)
{
  debug_target.to_fetch_registers (regcache, regno);
  debug_print_register ("target_fetch_registers", regcache, regno);
}

static void
debug_to_store_registers (struct regcache *regcache, int regno)
{
  debug_target.to_store_registers (regcache, regno);
  debug_print_register ("target_store_registers", regcache, regno);
  fprintf_unfiltered (gdb_stdlog, "\n");
}

static void
debug_to_prepare_to_store (struct regcache *regcache)
{
  debug_target.to_prepare_to_store (regcache);

  fprintf_unfiltered (gdb_stdlog, "target_prepare_to_store ()\n");
}

static int
deprecated_debug_xfer_memory (CORE_ADDR memaddr, bfd_byte *myaddr, int len,
			      int write, struct mem_attrib *attrib,
			      struct target_ops *target)
{
  int retval;

  retval = debug_target.deprecated_xfer_memory (memaddr, myaddr, len, write,
						attrib, target);

  fprintf_unfiltered (gdb_stdlog,
		      "target_xfer_memory (0x%x, xxx, %d, %s, xxx) = %d",
		      (unsigned int) memaddr,	/* possable truncate long long */
		      len, write ? "write" : "read", retval);

  if (retval > 0)
    {
      int i;

      fputs_unfiltered (", bytes =", gdb_stdlog);
      for (i = 0; i < retval; i++)
	{
	  if ((((long) &(myaddr[i])) & 0xf) == 0)
	    {
	      if (targetdebug < 2 && i > 0)
		{
		  fprintf_unfiltered (gdb_stdlog, " ...");
		  break;
		}
	      fprintf_unfiltered (gdb_stdlog, "\n");
	    }

	  fprintf_unfiltered (gdb_stdlog, " %02x", myaddr[i] & 0xff);
	}
    }

  fputc_unfiltered ('\n', gdb_stdlog);

  return retval;
}

static void
debug_to_files_info (struct target_ops *target)
{
  debug_target.to_files_info (target);

  fprintf_unfiltered (gdb_stdlog, "target_files_info (xxx)\n");
}

static int
debug_to_insert_breakpoint (struct bp_target_info *bp_tgt)
{
  int retval;

  retval = debug_target.to_insert_breakpoint (bp_tgt);

  fprintf_unfiltered (gdb_stdlog,
		      "target_insert_breakpoint (0x%lx, xxx) = %ld\n",
		      (unsigned long) bp_tgt->placed_address,
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_remove_breakpoint (struct bp_target_info *bp_tgt)
{
  int retval;

  retval = debug_target.to_remove_breakpoint (bp_tgt);

  fprintf_unfiltered (gdb_stdlog,
		      "target_remove_breakpoint (0x%lx, xxx) = %ld\n",
		      (unsigned long) bp_tgt->placed_address,
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_can_use_hw_breakpoint (int type, int cnt, int from_tty)
{
  int retval;

  retval = debug_target.to_can_use_hw_breakpoint (type, cnt, from_tty);

  fprintf_unfiltered (gdb_stdlog,
		      "target_can_use_hw_breakpoint (%ld, %ld, %ld) = %ld\n",
		      (unsigned long) type,
		      (unsigned long) cnt,
		      (unsigned long) from_tty,
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
  CORE_ADDR retval;

  retval = debug_target.to_region_ok_for_hw_watchpoint (addr, len);

  fprintf_unfiltered (gdb_stdlog,
		      "TARGET_REGION_OK_FOR_HW_WATCHPOINT (%ld, %ld) = 0x%lx\n",
		      (unsigned long) addr,
		      (unsigned long) len,
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_stopped_by_watchpoint (void)
{
  int retval;

  retval = debug_target.to_stopped_by_watchpoint ();

  fprintf_unfiltered (gdb_stdlog,
		      "STOPPED_BY_WATCHPOINT () = %ld\n",
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_stopped_data_address (struct target_ops *target, CORE_ADDR *addr)
{
  int retval;

  retval = debug_target.to_stopped_data_address (target, addr);

  fprintf_unfiltered (gdb_stdlog,
		      "target_stopped_data_address ([0x%lx]) = %ld\n",
		      (unsigned long)*addr,
		      (unsigned long)retval);
  return retval;
}

static int
debug_to_insert_hw_breakpoint (struct bp_target_info *bp_tgt)
{
  int retval;

  retval = debug_target.to_insert_hw_breakpoint (bp_tgt);

  fprintf_unfiltered (gdb_stdlog,
		      "target_insert_hw_breakpoint (0x%lx, xxx) = %ld\n",
		      (unsigned long) bp_tgt->placed_address,
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_remove_hw_breakpoint (struct bp_target_info *bp_tgt)
{
  int retval;

  retval = debug_target.to_remove_hw_breakpoint (bp_tgt);

  fprintf_unfiltered (gdb_stdlog,
		      "target_remove_hw_breakpoint (0x%lx, xxx) = %ld\n",
		      (unsigned long) bp_tgt->placed_address,
		      (unsigned long) retval);
  return retval;
}

static int
debug_to_insert_watchpoint (CORE_ADDR addr, int len, int type)
{
  int retval;

  retval = debug_target.to_insert_watchpoint (addr, len, type);

  fprintf_unfiltered (gdb_stdlog,
		      "target_insert_watchpoint (0x%lx, %d, %d) = %ld\n",
		      (unsigned long) addr, len, type, (unsigned long) retval);
  return retval;
}

static int
debug_to_remove_watchpoint (CORE_ADDR addr, int len, int type)
{
  int retval;

  retval = debug_target.to_remove_watchpoint (addr, len, type);

  fprintf_unfiltered (gdb_stdlog,
		      "target_remove_watchpoint (0x%lx, %d, %d) = %ld\n",
		      (unsigned long) addr, len, type, (unsigned long) retval);
  return retval;
}

static void
debug_to_terminal_init (void)
{
  debug_target.to_terminal_init ();

  fprintf_unfiltered (gdb_stdlog, "target_terminal_init ()\n");
}

static void
debug_to_terminal_inferior (void)
{
  debug_target.to_terminal_inferior ();

  fprintf_unfiltered (gdb_stdlog, "target_terminal_inferior ()\n");
}

static void
debug_to_terminal_ours_for_output (void)
{
  debug_target.to_terminal_ours_for_output ();

  fprintf_unfiltered (gdb_stdlog, "target_terminal_ours_for_output ()\n");
}

static void
debug_to_terminal_ours (void)
{
  debug_target.to_terminal_ours ();

  fprintf_unfiltered (gdb_stdlog, "target_terminal_ours ()\n");
}

static void
debug_to_terminal_save_ours (void)
{
  debug_target.to_terminal_save_ours ();

  fprintf_unfiltered (gdb_stdlog, "target_terminal_save_ours ()\n");
}

static void
debug_to_terminal_info (char *arg, int from_tty)
{
  debug_target.to_terminal_info (arg, from_tty);

  fprintf_unfiltered (gdb_stdlog, "target_terminal_info (%s, %d)\n", arg,
		      from_tty);
}

static void
debug_to_kill (void)
{
  debug_target.to_kill ();

  fprintf_unfiltered (gdb_stdlog, "target_kill ()\n");
}

static void
debug_to_load (char *args, int from_tty)
{
  debug_target.to_load (args, from_tty);

  fprintf_unfiltered (gdb_stdlog, "target_load (%s, %d)\n", args, from_tty);
}

static int
debug_to_lookup_symbol (char *name, CORE_ADDR *addrp)
{
  int retval;

  retval = debug_target.to_lookup_symbol (name, addrp);

  fprintf_unfiltered (gdb_stdlog, "target_lookup_symbol (%s, xxx)\n", name);

  return retval;
}

static void
debug_to_create_inferior (char *exec_file, char *args, char **env,
			  int from_tty)
{
  debug_target.to_create_inferior (exec_file, args, env, from_tty);

  fprintf_unfiltered (gdb_stdlog, "target_create_inferior (%s, %s, xxx, %d)\n",
		      exec_file, args, from_tty);
}

static void
debug_to_post_startup_inferior (ptid_t ptid)
{
  debug_target.to_post_startup_inferior (ptid);

  fprintf_unfiltered (gdb_stdlog, "target_post_startup_inferior (%d)\n",
		      PIDGET (ptid));
}

static void
debug_to_acknowledge_created_inferior (int pid)
{
  debug_target.to_acknowledge_created_inferior (pid);

  fprintf_unfiltered (gdb_stdlog, "target_acknowledge_created_inferior (%d)\n",
		      pid);
}

static void
debug_to_insert_fork_catchpoint (int pid)
{
  debug_target.to_insert_fork_catchpoint (pid);

  fprintf_unfiltered (gdb_stdlog, "target_insert_fork_catchpoint (%d)\n",
		      pid);
}

static int
debug_to_remove_fork_catchpoint (int pid)
{
  int retval;

  retval = debug_target.to_remove_fork_catchpoint (pid);

  fprintf_unfiltered (gdb_stdlog, "target_remove_fork_catchpoint (%d) = %d\n",
		      pid, retval);

  return retval;
}

static void
debug_to_insert_vfork_catchpoint (int pid)
{
  debug_target.to_insert_vfork_catchpoint (pid);

  fprintf_unfiltered (gdb_stdlog, "target_insert_vfork_catchpoint (%d)\n",
		      pid);
}

static int
debug_to_remove_vfork_catchpoint (int pid)
{
  int retval;

  retval = debug_target.to_remove_vfork_catchpoint (pid);

  fprintf_unfiltered (gdb_stdlog, "target_remove_vfork_catchpoint (%d) = %d\n",
		      pid, retval);

  return retval;
}

static void
debug_to_insert_exec_catchpoint (int pid)
{
  debug_target.to_insert_exec_catchpoint (pid);

  fprintf_unfiltered (gdb_stdlog, "target_insert_exec_catchpoint (%d)\n",
		      pid);
}

static int
debug_to_remove_exec_catchpoint (int pid)
{
  int retval;

  retval = debug_target.to_remove_exec_catchpoint (pid);

  fprintf_unfiltered (gdb_stdlog, "target_remove_exec_catchpoint (%d) = %d\n",
		      pid, retval);

  return retval;
}

static int
debug_to_reported_exec_events_per_exec_call (void)
{
  int reported_exec_events;

  reported_exec_events = debug_target.to_reported_exec_events_per_exec_call ();

  fprintf_unfiltered (gdb_stdlog,
		      "target_reported_exec_events_per_exec_call () = %d\n",
		      reported_exec_events);

  return reported_exec_events;
}

static int
debug_to_has_exited (int pid, int wait_status, int *exit_status)
{
  int has_exited;

  has_exited = debug_target.to_has_exited (pid, wait_status, exit_status);

  fprintf_unfiltered (gdb_stdlog, "target_has_exited (%d, %d, %d) = %d\n",
		      pid, wait_status, *exit_status, has_exited);

  return has_exited;
}

static void
debug_to_mourn_inferior (void)
{
  debug_target.to_mourn_inferior ();

  fprintf_unfiltered (gdb_stdlog, "target_mourn_inferior ()\n");
}

static int
debug_to_can_run (void)
{
  int retval;

  retval = debug_target.to_can_run ();

  fprintf_unfiltered (gdb_stdlog, "target_can_run () = %d\n", retval);

  return retval;
}

static void
debug_to_notice_signals (ptid_t ptid)
{
  debug_target.to_notice_signals (ptid);

  fprintf_unfiltered (gdb_stdlog, "target_notice_signals (%d)\n",
                      PIDGET (ptid));
}

static int
debug_to_thread_alive (ptid_t ptid)
{
  int retval;

  retval = debug_target.to_thread_alive (ptid);

  fprintf_unfiltered (gdb_stdlog, "target_thread_alive (%d) = %d\n",
		      PIDGET (ptid), retval);

  return retval;
}

static void
debug_to_find_new_threads (void)
{
  debug_target.to_find_new_threads ();

  fputs_unfiltered ("target_find_new_threads ()\n", gdb_stdlog);
}

static void
debug_to_stop (void)
{
  debug_target.to_stop ();

  fprintf_unfiltered (gdb_stdlog, "target_stop ()\n");
}

static void
debug_to_rcmd (char *command,
	       struct ui_file *outbuf)
{
  debug_target.to_rcmd (command, outbuf);
  fprintf_unfiltered (gdb_stdlog, "target_rcmd (%s, ...)\n", command);
}

static char *
debug_to_pid_to_exec_file (int pid)
{
  char *exec_file;

  exec_file = debug_target.to_pid_to_exec_file (pid);

  fprintf_unfiltered (gdb_stdlog, "target_pid_to_exec_file (%d) = %s\n",
		      pid, exec_file);

  return exec_file;
}

static void
setup_target_debug (void)
{
  memcpy (&debug_target, &current_target, sizeof debug_target);

  current_target.to_open = debug_to_open;
  current_target.to_close = debug_to_close;
  current_target.to_attach = debug_to_attach;
  current_target.to_post_attach = debug_to_post_attach;
  current_target.to_detach = debug_to_detach;
  current_target.to_resume = debug_to_resume;
  current_target.to_wait = debug_to_wait;
  current_target.to_fetch_registers = debug_to_fetch_registers;
  current_target.to_store_registers = debug_to_store_registers;
  current_target.to_prepare_to_store = debug_to_prepare_to_store;
  current_target.deprecated_xfer_memory = deprecated_debug_xfer_memory;
  current_target.to_files_info = debug_to_files_info;
  current_target.to_insert_breakpoint = debug_to_insert_breakpoint;
  current_target.to_remove_breakpoint = debug_to_remove_breakpoint;
  current_target.to_can_use_hw_breakpoint = debug_to_can_use_hw_breakpoint;
  current_target.to_insert_hw_breakpoint = debug_to_insert_hw_breakpoint;
  current_target.to_remove_hw_breakpoint = debug_to_remove_hw_breakpoint;
  current_target.to_insert_watchpoint = debug_to_insert_watchpoint;
  current_target.to_remove_watchpoint = debug_to_remove_watchpoint;
  current_target.to_stopped_by_watchpoint = debug_to_stopped_by_watchpoint;
  current_target.to_stopped_data_address = debug_to_stopped_data_address;
  current_target.to_region_ok_for_hw_watchpoint = debug_to_region_ok_for_hw_watchpoint;
  current_target.to_terminal_init = debug_to_terminal_init;
  current_target.to_terminal_inferior = debug_to_terminal_inferior;
  current_target.to_terminal_ours_for_output = debug_to_terminal_ours_for_output;
  current_target.to_terminal_ours = debug_to_terminal_ours;
  current_target.to_terminal_save_ours = debug_to_terminal_save_ours;
  current_target.to_terminal_info = debug_to_terminal_info;
  current_target.to_kill = debug_to_kill;
  current_target.to_load = debug_to_load;
  current_target.to_lookup_symbol = debug_to_lookup_symbol;
  current_target.to_create_inferior = debug_to_create_inferior;
  current_target.to_post_startup_inferior = debug_to_post_startup_inferior;
  current_target.to_acknowledge_created_inferior = debug_to_acknowledge_created_inferior;
  current_target.to_insert_fork_catchpoint = debug_to_insert_fork_catchpoint;
  current_target.to_remove_fork_catchpoint = debug_to_remove_fork_catchpoint;
  current_target.to_insert_vfork_catchpoint = debug_to_insert_vfork_catchpoint;
  current_target.to_remove_vfork_catchpoint = debug_to_remove_vfork_catchpoint;
  current_target.to_insert_exec_catchpoint = debug_to_insert_exec_catchpoint;
  current_target.to_remove_exec_catchpoint = debug_to_remove_exec_catchpoint;
  current_target.to_reported_exec_events_per_exec_call = debug_to_reported_exec_events_per_exec_call;
  current_target.to_has_exited = debug_to_has_exited;
  current_target.to_mourn_inferior = debug_to_mourn_inferior;
  current_target.to_can_run = debug_to_can_run;
  current_target.to_notice_signals = debug_to_notice_signals;
  current_target.to_thread_alive = debug_to_thread_alive;
  current_target.to_find_new_threads = debug_to_find_new_threads;
  current_target.to_stop = debug_to_stop;
  current_target.to_rcmd = debug_to_rcmd;
  current_target.to_pid_to_exec_file = debug_to_pid_to_exec_file;
}


static char targ_desc[] =
"Names of targets and files being debugged.\n\
Shows the entire stack of targets currently in use (including the exec-file,\n\
core-file, and process, if any), as well as the symbol file name.";

static void
do_monitor_command (char *cmd,
		 int from_tty)
{
  if ((current_target.to_rcmd
       == (void (*) (char *, struct ui_file *)) tcomplain)
      || (current_target.to_rcmd == debug_to_rcmd
	  && (debug_target.to_rcmd
	      == (void (*) (char *, struct ui_file *)) tcomplain)))
    error (_("\"monitor\" command not supported by this target."));
  target_rcmd (cmd, gdb_stdtarg);
}

/* Print the name of each layers of our target stack.  */

static void
maintenance_print_target_stack (char *cmd, int from_tty)
{
  struct target_ops *t;

  printf_filtered (_("The current target stack is:\n"));

  for (t = target_stack; t != NULL; t = t->beneath)
    {
      printf_filtered ("  - %s (%s)\n", t->to_shortname, t->to_longname);
    }
}

void
initialize_targets (void)
{
  init_dummy_target ();
  push_target (&dummy_target);

  add_info ("target", target_info, targ_desc);
  add_info ("files", target_info, targ_desc);

  add_setshow_zinteger_cmd ("target", class_maintenance, &targetdebug, _("\
Set target debugging."), _("\
Show target debugging."), _("\
When non-zero, target debugging is enabled.  Higher numbers are more\n\
verbose.  Changes do not take effect until the next \"run\" or \"target\"\n\
command."),
			    NULL,
			    show_targetdebug,
			    &setdebuglist, &showdebuglist);

  add_setshow_boolean_cmd ("trust-readonly-sections", class_support,
			   &trust_readonly, _("\
Set mode for reading from readonly sections."), _("\
Show mode for reading from readonly sections."), _("\
When this mode is on, memory reads from readonly sections (such as .text)\n\
will be read from the object file instead of from the target.  This will\n\
result in significant performance improvement for remote targets."),
			   NULL,
			   show_trust_readonly,
			   &setlist, &showlist);

  add_com ("monitor", class_obscure, do_monitor_command,
	   _("Send a command to the remote monitor (remote targets only)."));

  add_cmd ("target-stack", class_maintenance, maintenance_print_target_stack,
           _("Print the name of each layer of the internal target stack."),
           &maintenanceprintlist);

  target_dcache = dcache_init ();
}