aboutsummaryrefslogtreecommitdiff
path: root/gdb/m3-nat.c
blob: c6b96795cfc3218f5470d839199ced19fd735154 (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
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
/* Interface GDB to Mach 3.0 operating systems.
   (Most) Mach 3.0 related routines live in this file.

   Copyright (C) 1992, 1996, 1999-2000 Free Software Foundation, Inc.

   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 even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/*
 * Author: Jukka Virtanen <jtv@hut.fi>
 *         Computing Centre
 *         Helsinki University of Technology
 *         Finland
 *
 * Thanks to my friends who helped with ideas and testing:
 *
 *      Johannes Helander, Antti Louko, Tero Mononen,
 *      jvh@cs.hut.fi      alo@hut.fi   tmo@cs.hut.fi
 *
 *      Tero Kivinen       and          Eamonn McManus
 *      kivinen@cs.hut.fi               emcmanus@gr.osf.org
 *      
 */

#include <stdio.h>

#include <mach.h>
#include <servers/netname.h>
#include <servers/machid.h>
#include <mach/message.h>
#include <mach/notify.h>
#include <mach_error.h>
#include <mach/exception.h>
#include <mach/vm_attributes.h>

#include "defs.h"
#include "inferior.h"
#include "symtab.h"
#include "value.h"
#include "language.h"
#include "target.h"
#include "gdb_wait.h"
#include "gdbcmd.h"
#include "gdbcore.h"

#if 0
#include <servers/machid_lib.h>
#else
#define	MACH_TYPE_TASK			1
#define MACH_TYPE_THREAD		2
#endif

/* Included only for signal names and NSIG

 * note: There are many problems in signal handling with
 *       gdb in Mach 3.0 in general.
 */
#include <signal.h>
#define SIG_UNKNOWN 0		/* Exception that has no matching unix signal */

#include <cthreads.h>

/* This is what a cproc looks like.  This is here partly because
   cthread_internals.h is not a header we can just #include, partly with
   an eye towards perhaps getting this to work with cross-debugging
   someday.  Best solution is if CMU publishes a real interface to this
   stuff.  */
#define CPROC_NEXT_OFFSET 0
#define CPROC_NEXT_SIZE (TARGET_PTR_BIT / HOST_CHAR_BIT)
#define CPROC_INCARNATION_OFFSET (CPROC_NEXT_OFFSET + CPROC_NEXT_SIZE)
#define CPROC_INCARNATION_SIZE (sizeof (cthread_t))
#define CPROC_LIST_OFFSET (CPROC_INCARNATION_OFFSET + CPROC_INCARNATION_SIZE)
#define CPROC_LIST_SIZE (TARGET_PTR_BIT / HOST_CHAR_BIT)
#define CPROC_WAIT_OFFSET (CPROC_LIST_OFFSET + CPROC_LIST_SIZE)
#define CPROC_WAIT_SIZE (TARGET_PTR_BIT / HOST_CHAR_BIT)
#define CPROC_REPLY_OFFSET (CPROC_WAIT_OFFSET + CPROC_WAIT_SIZE)
#define CPROC_REPLY_SIZE (sizeof (mach_port_t))
#define CPROC_CONTEXT_OFFSET (CPROC_REPLY_OFFSET + CPROC_REPLY_SIZE)
#define CPROC_CONTEXT_SIZE (TARGET_INT_BIT / HOST_CHAR_BIT)
#define CPROC_LOCK_OFFSET (CPROC_CONTEXT_OFFSET + CPROC_CONTEXT_SIZE)
#define CPROC_LOCK_SIZE (sizeof (spin_lock_t))
#define CPROC_STATE_OFFSET (CPROC_LOCK_OFFSET + CPROC_LOCK_SIZE)
#define CPROC_STATE_SIZE (TARGET_INT_BIT / HOST_CHAR_BIT)
#define CPROC_WIRED_OFFSET (CPROC_STATE_OFFSET + CPROC_STATE_SIZE)
#define CPROC_WIRED_SIZE (sizeof (mach_port_t))
#define CPROC_BUSY_OFFSET (CPROC_WIRED_OFFSET + CPROC_WIRED_SIZE)
#define CPROC_BUSY_SIZE (TARGET_INT_BIT / HOST_CHAR_BIT)
#define CPROC_MSG_OFFSET (CPROC_BUSY_OFFSET + CPROC_BUSY_SIZE)
#define CPROC_MSG_SIZE (sizeof (mach_msg_header_t))
#define CPROC_BASE_OFFSET (CPROC_MSG_OFFSET + CPROC_MSG_SIZE)
#define CPROC_BASE_SIZE (TARGET_INT_BIT / HOST_CHAR_BIT)
#define CPROC_SIZE_OFFSET (CPROC_BASE_OFFSET + CPROC_BASE_SIZE)
#define CPROC_SIZE_SIZE (TARGET_INT_BIT / HOST_CHAR_BIT)
#define CPROC_SIZE (CPROC_SIZE_OFFSET + CPROC_SIZE_SIZE)

/* Values for the state field in the cproc.  */
#define CPROC_RUNNING	0
#define CPROC_SWITCHING 1
#define CPROC_BLOCKED	2
#define CPROC_CONDWAIT	4

/* For cproc and kernel thread mapping */
typedef struct gdb_thread
  {
    mach_port_t name;
    CORE_ADDR sp;
    CORE_ADDR pc;
    CORE_ADDR fp;
    boolean_t in_emulator;
    int slotid;

    /* This is for the mthreads list.  It points to the cproc list.
       Perhaps the two lists should be merged (or perhaps it was a mistake
       to make them both use a struct gdb_thread).  */
    struct gdb_thread *cproc;

    /* These are for the cproc list, which is linked through the next field
       of the struct gdb_thread.  */
    char raw_cproc[CPROC_SIZE];
    /* The cthread which is pointed to by the incarnation field from the
       cproc.  This points to the copy we've read into GDB.  */
    cthread_t cthread;
    /* Point back to the mthreads list.  */
    int reverse_map;
    struct gdb_thread *next;
  }
 *gdb_thread_t;

/* 
 * Actions for Mach exceptions.
 *
 * sigmap field maps the exception to corresponding Unix signal.
 *
 * I do not know how to map the exception to unix signal
 * if SIG_UNKNOWN is specified.
 */

struct exception_list
  {
    char *name;
    boolean_t forward;
    boolean_t print;
    int sigmap;
  }
exception_map[] =
{
  {
    "not_mach3_exception", FALSE, TRUE, SIG_UNKNOWN
  }
  ,
  {
    "EXC_BAD_ACCESS", FALSE, TRUE, SIGSEGV
  }
  ,
  {
    "EXC_BAD_INSTRUCTION", FALSE, TRUE, SIGILL
  }
  ,
  {
    "EXC_ARITHMETIC", FALSE, TRUE, SIGFPE
  }
  ,
  {
    "EXC_EMULATION", FALSE, TRUE, SIGEMT
  }
  ,				/* ??? */
  {
    "EXC_SOFTWARE", FALSE, TRUE, SIG_UNKNOWN
  }
  ,
  {
    "EXC_BREAKPOINT", FALSE, FALSE, SIGTRAP
  }
};

/* Mach exception table size */
int max_exception = sizeof (exception_map) / sizeof (struct exception_list) - 1;

#define MAX_EXCEPTION max_exception

WAITTYPE wait_status;

/* If you define this, intercepted bsd server calls will be
 * dumped while waiting the inferior to EXEC the correct
 * program
 */
/* #define DUMP_SYSCALL         /* debugging interceptor */

/* xx_debug() outputs messages if this is nonzero.
 * If > 1, DUMP_SYSCALL will dump message contents.
 */
int debug_level = 0;

/* "Temporary" debug stuff */
void
xx_debug (fmt, a, b, c)
     char *fmt;
     int a, b, c;
{
  if (debug_level)
    warning (fmt, a, b, c);
}

/* This is in libmach.a */
extern mach_port_t name_server_port;

/* Set in catch_exception_raise */
int stop_exception, stop_code, stop_subcode;
int stopped_in_exception;

/* Thread that was the active thread when we stopped */
thread_t stop_thread = MACH_PORT_NULL;

char *hostname = "";

/* Set when task is attached or created */
boolean_t emulator_present = FALSE;

task_t inferior_task;
thread_t current_thread;

/* Exception ports for inferior task */
mach_port_t inferior_exception_port = MACH_PORT_NULL;
mach_port_t inferior_old_exception_port = MACH_PORT_NULL;

/* task exceptions and notifications */
mach_port_t inferior_wait_port_set = MACH_PORT_NULL;
mach_port_t our_notify_port = MACH_PORT_NULL;

/* This is "inferior_wait_port_set" when not single stepping, and
 *         "singlestepped_thread_port" when we are single stepping.
 * 
 * This is protected by a cleanup function: discard_single_step()
 */
mach_port_t currently_waiting_for = MACH_PORT_NULL;

/* A port for external messages to gdb.
 * External in the meaning that they do not come
 * from the inferior_task, but rather from external
 * tasks.
 *
 * As a debugging feature:
 * A debugger debugging another debugger can stop the
 * inferior debugger by the following command sequence
 * (without running external programs)
 *
 *    (top-gdb) set stop_inferior_gdb ()
 *    (top-gdb) continue
 */
mach_port_t our_message_port = MACH_PORT_NULL;

/* For single stepping */
mach_port_t thread_exception_port = MACH_PORT_NULL;
mach_port_t thread_saved_exception_port = MACH_PORT_NULL;
mach_port_t singlestepped_thread_port = MACH_PORT_NULL;

/* For machid calls */
mach_port_t mid_server = MACH_PORT_NULL;
mach_port_t mid_auth = MACH_PORT_NULL;

/* If gdb thinks the inferior task is not suspended, it
 * must take suspend/abort the threads when it reads the state.
 */
int must_suspend_thread = 0;

/* When single stepping, we switch the port that mach_really_wait() listens to.
 * This cleanup is a guard to prevent the port set from being left to
 * the singlestepped_thread_port when error() is called.
 *  This is nonzero only when we are single stepping.
 */
#define NULL_CLEANUP (struct cleanup *)0
struct cleanup *cleanup_step = NULL_CLEANUP;


static struct target_ops m3_ops;

static void m3_kill_inferior ();

#if 0
#define MACH_TYPE_EXCEPTION_PORT	-1
#endif

/* Chain of ports to remember requested notifications. */

struct port_chain
  {
    struct port_chain *next;
    mach_port_t port;
    int type;
    int mid;			/* Now only valid with MACH_TYPE_THREAD and */
    /*  MACH_TYPE_THREAD */
  };
typedef struct port_chain *port_chain_t;

/* Room for chain nodes comes from pchain_obstack */
struct obstack pchain_obstack;
struct obstack *port_chain_obstack = &pchain_obstack;

/* For thread handling */
struct obstack Cproc_obstack;
struct obstack *cproc_obstack = &Cproc_obstack;

/* the list of notified ports */
port_chain_t notify_chain = (port_chain_t) NULL;

port_chain_t
port_chain_insert (list, name, type)
     port_chain_t list;
     mach_port_t name;
     int type;
{
  kern_return_t ret;
  port_chain_t new;
  int mid;

  if (!MACH_PORT_VALID (name))
    return list;

  if (type == MACH_TYPE_TASK || type == MACH_TYPE_THREAD)
    {
      if (!MACH_PORT_VALID (mid_server))
	{
	  warning ("Machid server port invalid, can not map port 0x%x to MID",
		   name);
	  mid = name;
	}
      else
	{
	  ret = machid_mach_register (mid_server, mid_auth, name, type, &mid);

	  if (ret != KERN_SUCCESS)
	    {
	      warning ("Can not map name (0x%x) to MID with machid", name);
	      mid = name;
	    }
	}
    }
  else
    abort ();

  new = (port_chain_t) obstack_alloc (port_chain_obstack,
				      sizeof (struct port_chain));
  new->next = list;
  new->port = name;
  new->type = type;
  new->mid = mid;

  return new;
}

port_chain_t
port_chain_delete (list, elem)
     port_chain_t list;
     mach_port_t elem;
{
  if (list)
    if (list->port == elem)
      list = list->next;
    else
      while (list->next)
	{
	  if (list->next->port == elem)
	    list->next = list->next->next;	/* GCd with obstack_free() */
	  else
	    list = list->next;
	}
  return list;
}

void
port_chain_destroy (ostack)
     struct obstack *ostack;
{
  obstack_free (ostack, 0);
  obstack_init (ostack);
}

port_chain_t
port_chain_member (list, elem)
     port_chain_t list;
     mach_port_t elem;
{
  while (list)
    {
      if (list->port == elem)
	return list;
      list = list->next;
    }
  return (port_chain_t) NULL;
}

int
map_port_name_to_mid (name, type)
     mach_port_t name;
     int type;
{
  port_chain_t elem;

  if (!MACH_PORT_VALID (name))
    return -1;

  elem = port_chain_member (notify_chain, name);

  if (elem && (elem->type == type))
    return elem->mid;

  if (elem)
    return -1;

  if (!MACH_PORT_VALID (mid_server))
    {
      warning ("Machid server port invalid, can not map port 0x%x to mid",
	       name);
      return -1;
    }
  else
    {
      int mid;
      kern_return_t ret;

      ret = machid_mach_register (mid_server, mid_auth, name, type, &mid);

      if (ret != KERN_SUCCESS)
	{
	  warning ("Can not map name (0x%x) to mid with machid", name);
	  return -1;
	}
      return mid;
    }
}

/* Guard for currently_waiting_for and singlestepped_thread_port */
static void
discard_single_step (thread)
     thread_t thread;
{
  currently_waiting_for = inferior_wait_port_set;

  cleanup_step = NULL_CLEANUP;
  if (MACH_PORT_VALID (thread) && MACH_PORT_VALID (singlestepped_thread_port))
    setup_single_step (thread, FALSE);
}

setup_single_step (thread, start_step)
     thread_t thread;
     boolean_t start_step;
{
  kern_return_t ret;

  if (!MACH_PORT_VALID (thread))
    error ("Invalid thread supplied to setup_single_step");
  else
    {
      mach_port_t teport;

      /* Get the current thread exception port */
      ret = thread_get_exception_port (thread, &teport);
      CHK ("Getting thread's exception port", ret);

      if (start_step)
	{
	  if (MACH_PORT_VALID (singlestepped_thread_port))
	    {
	      warning ("Singlestepped_thread_port (0x%x) is still valid?",
		       singlestepped_thread_port);
	      singlestepped_thread_port = MACH_PORT_NULL;
	    }

	  /* If we are already stepping this thread */
	  if (MACH_PORT_VALID (teport) && teport == thread_exception_port)
	    {
	      ret = mach_port_deallocate (mach_task_self (), teport);
	      CHK ("Could not deallocate thread exception port", ret);
	    }
	  else
	    {
	      ret = thread_set_exception_port (thread, thread_exception_port);
	      CHK ("Setting exception port for thread", ret);
#if 0
	      /* Insert thread exception port to wait port set */
	      ret = mach_port_move_member (mach_task_self (),
					   thread_exception_port,
					   inferior_wait_port_set);
	      CHK ("Moving thread exception port to inferior_wait_port_set",
		   ret);
#endif
	      thread_saved_exception_port = teport;
	    }

	  thread_trace (thread, TRUE);

	  singlestepped_thread_port = thread_exception_port;
	  currently_waiting_for = singlestepped_thread_port;
	  cleanup_step = make_cleanup (discard_single_step, thread);
	}
      else
	{
	  if (!MACH_PORT_VALID (teport))
	    error ("Single stepped thread had an invalid exception port?");

	  if (teport != thread_exception_port)
	    error ("Single stepped thread had an unknown exception port?");

	  ret = mach_port_deallocate (mach_task_self (), teport);
	  CHK ("Couldn't deallocate thread exception port", ret);
#if 0
	  /* Remove thread exception port from wait port set */
	  ret = mach_port_move_member (mach_task_self (),
				       thread_exception_port,
				       MACH_PORT_NULL);
	  CHK ("Removing thread exception port from inferior_wait_port_set",
	       ret);
#endif
	  /* Restore thread's old exception port */
	  ret = thread_set_exception_port (thread,
					   thread_saved_exception_port);
	  CHK ("Restoring stepped thread's exception port", ret);

	  if (MACH_PORT_VALID (thread_saved_exception_port))
	    (void) mach_port_deallocate (mach_task_self (),
					 thread_saved_exception_port);

	  thread_trace (thread, FALSE);

	  singlestepped_thread_port = MACH_PORT_NULL;
	  currently_waiting_for = inferior_wait_port_set;
	  if (cleanup_step)
	    discard_cleanups (cleanup_step);
	}
    }
}

static
request_notify (name, variant, type)
     mach_port_t name;
     mach_msg_id_t variant;
     int type;
{
  kern_return_t ret;
  mach_port_t previous_port_dummy = MACH_PORT_NULL;

  if (!MACH_PORT_VALID (name))
    return;

  if (port_chain_member (notify_chain, name))
    return;

  ret = mach_port_request_notification (mach_task_self (),
					name,
					variant,
					1,
					our_notify_port,
					MACH_MSG_TYPE_MAKE_SEND_ONCE,
					&previous_port_dummy);
  CHK ("Serious: request_notify failed", ret);

  (void) mach_port_deallocate (mach_task_self (),
			       previous_port_dummy);

  notify_chain = port_chain_insert (notify_chain, name, type);
}

reverse_msg_bits (msgp, type)
     mach_msg_header_t *msgp;
     int type;
{
  int rbits, lbits;
  rbits = MACH_MSGH_BITS_REMOTE (msgp->msgh_bits);
  lbits = type;
  msgp->msgh_bits =
    (msgp->msgh_bits & ~MACH_MSGH_BITS_PORTS_MASK) |
    MACH_MSGH_BITS (lbits, rbits);
}

/* On the third day He said:

   Let this be global
   and then it was global.

   When creating the inferior fork, the
   child code in inflow.c sets the name of the
   bootstrap_port in its address space to this
   variable.

   The name is transferred to our address space
   with mach3_read_inferior().

   Thou shalt not do this with
   task_get_bootstrap_port() in this task, since
   the name in the inferior task is different than
   the one we get.

   For blessed are the meek, as they shall inherit
   the address space.
 */
mach_port_t original_server_port_name = MACH_PORT_NULL;


/* Called from inferior after FORK but before EXEC */
static void
m3_trace_me ()
{
  kern_return_t ret;

  /* Get the NAME of the bootstrap port in this task
     so that GDB can read it */
  ret = task_get_bootstrap_port (mach_task_self (),
				 &original_server_port_name);
  if (ret != KERN_SUCCESS)
    abort ();
  ret = mach_port_deallocate (mach_task_self (),
			      original_server_port_name);
  if (ret != KERN_SUCCESS)
    abort ();

  /* Suspend this task to let the parent change my ports.
     Resumed by the debugger */
  ret = task_suspend (mach_task_self ());
  if (ret != KERN_SUCCESS)
    abort ();
}

/*
 * Intercept system calls to Unix server.
 * After EXEC_COUNTER calls to exec(), return.
 *
 * Pre-assertion:  Child is suspended. (Not verified)
 * Post-condition: Child is suspended after EXEC_COUNTER exec() calls.
 */

void
intercept_exec_calls (exec_counter)
     int exec_counter;
{
  int terminal_initted = 0;

  struct syscall_msg_t
    {
      mach_msg_header_t header;
      mach_msg_type_t type;
      char room[2000];		/* Enuff space */
    };

  struct syscall_msg_t syscall_in, syscall_out;

  mach_port_t fake_server;
  mach_port_t original_server_send;
  mach_port_t original_exec_reply;
  mach_port_t exec_reply;
  mach_port_t exec_reply_send;
  mach_msg_type_name_t acquired;
  mach_port_t emulator_server_port_name;
  struct task_basic_info info;
  mach_msg_type_number_t info_count;

  kern_return_t ret;

  if (exec_counter <= 0)
    return;			/* We are already set up in the correct program */

  ret = mach_port_allocate (mach_task_self (),
			    MACH_PORT_RIGHT_RECEIVE,
			    &fake_server);
  CHK ("create inferior_fake_server port failed", ret);

  /* Wait for inferior_task to suspend itself */
  while (1)
    {
      info_count = sizeof (info);
      ret = task_info (inferior_task,
		       TASK_BASIC_INFO,
		       (task_info_t) & info,
		       &info_count);
      CHK ("Task info", ret);

      if (info.suspend_count)
	break;

      /* Note that the definition of the parameter was undefined
       * at the time of this writing, so I just use an `ad hoc' value.
       */
      (void) swtch_pri (42);	/* Universal Priority Value */
    }

  /* Read the inferior's bootstrap port name */
  if (!mach3_read_inferior (&original_server_port_name,
			    &original_server_port_name,
			    sizeof (original_server_port_name)))
    error ("Can't read inferior task bootstrap port name");

  /* @@ BUG: If more than 1 send right GDB will FAIL!!! */
  /*      Should get refs, and set them back when restoring */
  /* Steal the original bsd server send right from inferior */
  ret = mach_port_extract_right (inferior_task,
				 original_server_port_name,
				 MACH_MSG_TYPE_MOVE_SEND,
				 &original_server_send,
				 &acquired);
  CHK ("mach_port_extract_right (bsd server send)", ret);

  if (acquired != MACH_MSG_TYPE_PORT_SEND)
    error ("Incorrect right extracted, send right to bsd server excpected");

  ret = mach_port_insert_right (inferior_task,
				original_server_port_name,
				fake_server,
				MACH_MSG_TYPE_MAKE_SEND);
  CHK ("mach_port_insert_right (fake server send)", ret);

  xx_debug ("inferior task bsd server ports set up \nfs %x, ospn %x, oss %x\n",
	    fake_server,
	    original_server_port_name, original_server_send);

  /* A receive right to the reply generated by unix server exec() request */
  ret = mach_port_allocate (mach_task_self (),
			    MACH_PORT_RIGHT_RECEIVE,
			    &exec_reply);
  CHK ("create intercepted_reply_port port failed", ret);

  /* Pass this send right to Unix server so it replies to us after exec() */
  ret = mach_port_extract_right (mach_task_self (),
				 exec_reply,
				 MACH_MSG_TYPE_MAKE_SEND_ONCE,
				 &exec_reply_send,
				 &acquired);
  CHK ("mach_port_extract_right (exec_reply)", ret);

  if (acquired != MACH_MSG_TYPE_PORT_SEND_ONCE)
    error ("Incorrect right extracted, send once excpected for exec reply");

  ret = mach_port_move_member (mach_task_self (),
			       fake_server,
			       inferior_wait_port_set);
  CHK ("Moving fake syscall port to inferior_wait_port_set", ret);

  xx_debug ("syscall fake server set up, resuming inferior\n");

  ret = task_resume (inferior_task);
  CHK ("task_resume (startup)", ret);

  /* Read requests from the inferior.
     Pass directly through everything else except exec() calls.
   */
  while (exec_counter > 0)
    {
      ret = mach_msg (&syscall_in.header,	/* header */
		      MACH_RCV_MSG,	/* options */
		      0,	/* send size */
		      sizeof (struct syscall_msg_t),	/* receive size */
		      inferior_wait_port_set,	/* receive_name */
		      MACH_MSG_TIMEOUT_NONE,
		      MACH_PORT_NULL);
      CHK ("mach_msg (intercepted sycall)", ret);

#ifdef DUMP_SYSCALL
      print_msg (&syscall_in.header);
#endif

      /* ASSERT : msgh_local_port == fake_server */

      if (notify_server (&syscall_in.header, &syscall_out.header))
	error ("received a notify while intercepting syscalls");

      if (syscall_in.header.msgh_id == MIG_EXEC_SYSCALL_ID)
	{
	  xx_debug ("Received EXEC SYSCALL, counter = %d\n", exec_counter);
	  if (exec_counter == 1)
	    {
	      original_exec_reply = syscall_in.header.msgh_remote_port;
	      syscall_in.header.msgh_remote_port = exec_reply_send;
	    }

	  if (!terminal_initted)
	    {
	      /* Now that the child has exec'd we know it has already set its
	         process group.  On POSIX systems, tcsetpgrp will fail with
	         EPERM if we try it before the child's setpgid.  */

	      /* Set up the "saved terminal modes" of the inferior
	         based on what modes we are starting it with.  */
	      target_terminal_init ();

	      /* Install inferior's terminal modes.  */
	      target_terminal_inferior ();

	      terminal_initted = 1;
	    }

	  exec_counter--;
	}

      syscall_in.header.msgh_local_port = syscall_in.header.msgh_remote_port;
      syscall_in.header.msgh_remote_port = original_server_send;

      reverse_msg_bits (&syscall_in.header, MACH_MSG_TYPE_COPY_SEND);

      ret = mach_msg_send (&syscall_in.header);
      CHK ("Forwarded syscall", ret);
    }

  ret = mach_port_move_member (mach_task_self (),
			       fake_server,
			       MACH_PORT_NULL);
  CHK ("Moving fake syscall out of inferior_wait_port_set", ret);

  ret = mach_port_move_member (mach_task_self (),
			       exec_reply,
			       inferior_wait_port_set);
  CHK ("Moving exec_reply to inferior_wait_port_set", ret);

  ret = mach_msg (&syscall_in.header,	/* header */
		  MACH_RCV_MSG,	/* options */
		  0,		/* send size */
		  sizeof (struct syscall_msg_t),	/* receive size */
		  inferior_wait_port_set,	/* receive_name */
		  MACH_MSG_TIMEOUT_NONE,
		  MACH_PORT_NULL);
  CHK ("mach_msg (exec reply)", ret);

  ret = task_suspend (inferior_task);
  CHK ("Suspending inferior after last exec", ret);

  must_suspend_thread = 0;

  xx_debug ("Received exec reply from bsd server, suspended inferior task\n");

#ifdef DUMP_SYSCALL
  print_msg (&syscall_in.header);
#endif

  /* Message should appear as if it came from the unix server */
  syscall_in.header.msgh_local_port = MACH_PORT_NULL;

  /*  and go to the inferior task original reply port */
  syscall_in.header.msgh_remote_port = original_exec_reply;

  reverse_msg_bits (&syscall_in.header, MACH_MSG_TYPE_MOVE_SEND_ONCE);

  ret = mach_msg_send (&syscall_in.header);
  CHK ("Forwarding exec reply to inferior", ret);

  /* Garbage collect */
  ret = mach_port_deallocate (inferior_task,
			      original_server_port_name);
  CHK ("deallocating fake server send right", ret);

  ret = mach_port_insert_right (inferior_task,
				original_server_port_name,
				original_server_send,
				MACH_MSG_TYPE_MOVE_SEND);
  CHK ("Restoring the original bsd server send right", ret);

  ret = mach_port_destroy (mach_task_self (),
			   fake_server);
  fake_server = MACH_PORT_DEAD;
  CHK ("mach_port_destroy (fake_server)", ret);

  ret = mach_port_destroy (mach_task_self (),
			   exec_reply);
  exec_reply = MACH_PORT_DEAD;
  CHK ("mach_port_destroy (exec_reply)", ret);

  xx_debug ("Done with exec call interception\n");
}

void
consume_send_rights (thread_list, thread_count)
     thread_array_t thread_list;
     int thread_count;
{
  int index;

  if (!thread_count)
    return;

  for (index = 0; index < thread_count; index++)
    {
      /* Since thread kill command kills threads, don't check ret */
      (void) mach_port_deallocate (mach_task_self (),
				   thread_list[index]);
    }
}

/* suspend/abort/resume a thread. */
setup_thread (thread, what)
     mach_port_t thread;
     int what;
{
  kern_return_t ret;

  if (what)
    {
      ret = thread_suspend (thread);
      CHK ("setup_thread thread_suspend", ret);

      ret = thread_abort (thread);
      CHK ("setup_thread thread_abort", ret);
    }
  else
    {
      ret = thread_resume (thread);
      CHK ("setup_thread thread_resume", ret);
    }
}

int
map_slot_to_mid (slot, threads, thread_count)
     int slot;
     thread_array_t threads;
     int thread_count;
{
  kern_return_t ret;
  int deallocate = 0;
  int index;
  int mid;

  if (!threads)
    {
      deallocate++;
      ret = task_threads (inferior_task, &threads, &thread_count);
      CHK ("Can not select a thread from a dead task", ret);
    }

  if (slot < 0 || slot >= thread_count)
    {
      if (deallocate)
	{
	  consume_send_rights (threads, thread_count);
	  (void) vm_deallocate (mach_task_self (), (vm_address_t) threads,
				(thread_count * sizeof (mach_port_t)));
	}
      if (slot < 0)
	error ("invalid slot number");
      else
	return -(slot + 1);
    }

  mid = map_port_name_to_mid (threads[slot], MACH_TYPE_THREAD);

  if (deallocate)
    {
      consume_send_rights (threads, thread_count);
      (void) vm_deallocate (mach_task_self (), (vm_address_t) threads,
			    (thread_count * sizeof (mach_port_t)));
    }

  return mid;
}

static int
parse_thread_id (arg, thread_count, slots)
     char *arg;
     int thread_count;
     int slots;
{
  kern_return_t ret;
  int mid;
  int slot;
  int index;

  if (arg == 0)
    return 0;

  while (*arg && (*arg == ' ' || *arg == '\t'))
    arg++;

  if (!*arg)
    return 0;

  /* Currently parse MID and @SLOTNUMBER */
  if (*arg != '@')
    {
      mid = atoi (arg);
      if (mid <= 0)
	error ("valid thread mid expected");
      return mid;
    }

  arg++;
  slot = atoi (arg);

  if (slot < 0)
    error ("invalid slot number");

  /* If you want slot numbers to remain slot numbers, set slots.

   * Well, since 0 is reserved, return the ordinal number
   * of the thread rather than the slot number. Awk, this
   * counts as a kludge.
   */
  if (slots)
    return -(slot + 1);

  if (thread_count && slot >= thread_count)
    return -(slot + 1);

  mid = map_slot_to_mid (slot);

  return mid;
}

/* THREAD_ID 0 is special; it selects the first kernel
 * thread from the list (i.e. SLOTNUMBER 0)
 * This is used when starting the program with 'run' or when attaching.
 *
 * If FLAG is 0 the context is not changed, and the registers, frame, etc
 * will continue to describe the old thread.
 *
 * If FLAG is nonzero, really select the thread.
 * If FLAG is 2, the THREAD_ID is a slotnumber instead of a mid.
 * 
 */
kern_return_t
select_thread (task, thread_id, flag)
     mach_port_t task;
     int thread_id;
     int flag;
{
  thread_array_t thread_list;
  int thread_count;
  kern_return_t ret;
  int index;
  thread_t new_thread = MACH_PORT_NULL;

  if (thread_id < 0)
    error ("Can't select cprocs without kernel thread");

  ret = task_threads (task, &thread_list, &thread_count);
  if (ret != KERN_SUCCESS)
    {
      warning ("Can not select a thread from a dead task");
      m3_kill_inferior ();
      return KERN_FAILURE;
    }

  if (thread_count == 0)
    {
      /* The task can not do anything anymore, but it still
       * exists as a container for memory and ports.
       */
      registers_changed ();
      warning ("Task %d has no threads",
	       map_port_name_to_mid (task, MACH_TYPE_TASK));
      current_thread = MACH_PORT_NULL;
      (void) vm_deallocate (mach_task_self (),
			    (vm_address_t) thread_list,
			    (thread_count * sizeof (mach_port_t)));
      return KERN_FAILURE;
    }

  if (!thread_id || flag == 2)
    {
      /* First thread or a slotnumber */
      if (!thread_id)
	new_thread = thread_list[0];
      else
	{
	  if (thread_id < thread_count)
	    new_thread = thread_list[thread_id];
	  else
	    {
	      (void) vm_deallocate (mach_task_self (),
				    (vm_address_t) thread_list,
				    (thread_count * sizeof (mach_port_t)));
	      error ("No such thread slot number : %d", thread_id);
	    }
	}
    }
  else
    {
      for (index = 0; index < thread_count; index++)
	if (thread_id == map_port_name_to_mid (thread_list[index],
					       MACH_TYPE_THREAD))
	  {
	    new_thread = thread_list[index];
	    index = -1;
	    break;
	  }

      if (index != -1)
	error ("No thread with mid %d", thread_id);
    }

  /* Notify when the selected thread dies */
  request_notify (new_thread, MACH_NOTIFY_DEAD_NAME, MACH_TYPE_THREAD);

  ret = vm_deallocate (mach_task_self (),
		       (vm_address_t) thread_list,
		       (thread_count * sizeof (mach_port_t)));
  CHK ("vm_deallocate", ret);

  if (!flag)
    current_thread = new_thread;
  else
    {
#if 0
      if (MACH_PORT_VALID (current_thread))
	{
	  /* Store the gdb's view of the thread we are deselecting

	   * @@ I think gdb updates registers immediately when they are
	   * changed, so don't do this.
	   */
	  ret = thread_abort (current_thread);
	  CHK ("Could not abort system calls when saving state of old thread",
	       ret);
	  target_prepare_to_store ();
	  target_store_registers (-1);
	}
#endif

      registers_changed ();

      current_thread = new_thread;

      ret = thread_abort (current_thread);
      CHK ("Could not abort system calls when selecting a thread", ret);

      stop_pc = read_pc ();
      flush_cached_frames ();

      select_frame (get_current_frame (), 0);
    }

  return KERN_SUCCESS;
}

/*
 * Switch to use thread named NEW_THREAD.
 * Return it's MID
 */
int
switch_to_thread (new_thread)
     thread_t new_thread;
{
  thread_t saved_thread = current_thread;
  int mid;

  mid = map_port_name_to_mid (new_thread,
			      MACH_TYPE_THREAD);
  if (mid == -1)
    warning ("Can't map thread name 0x%x to mid", new_thread);
  else if (select_thread (inferior_task, mid, 1) != KERN_SUCCESS)
    {
      if (current_thread)
	current_thread = saved_thread;
      error ("Could not select thread %d", mid);
    }

  return mid;
}

/* Do this in gdb after doing FORK but before STARTUP_INFERIOR.
 * Note that the registers are not yet valid in the inferior task.
 */
static int
m3_trace_him (pid)
     int pid;
{
  kern_return_t ret;

  push_target (&m3_ops);

  inferior_task = task_by_pid (pid);

  if (!MACH_PORT_VALID (inferior_task))
    error ("Can not map Unix pid %d to Mach task", pid);

  /* Clean up previous notifications and create new ones */
  setup_notify_port (1);

  /* When notification appears, the inferior task has died */
  request_notify (inferior_task, MACH_NOTIFY_DEAD_NAME, MACH_TYPE_TASK);

  emulator_present = have_emulator_p (inferior_task);

  /* By default, select the first thread,
   * If task has no threads, gives a warning
   * Does not fetch registers, since they are not yet valid.
   */
  select_thread (inferior_task, 0, 0);

  inferior_exception_port = MACH_PORT_NULL;

  setup_exception_port ();

  xx_debug ("Now the debugged task is created\n");

  /* One trap to exec the shell, one to exec the program being debugged.  */
  intercept_exec_calls (2);

  return pid;
}

setup_exception_port ()
{
  kern_return_t ret;

  ret = mach_port_allocate (mach_task_self (),
			    MACH_PORT_RIGHT_RECEIVE,
			    &inferior_exception_port);
  CHK ("mach_port_allocate", ret);

  /* add send right */
  ret = mach_port_insert_right (mach_task_self (),
				inferior_exception_port,
				inferior_exception_port,
				MACH_MSG_TYPE_MAKE_SEND);
  CHK ("mach_port_insert_right", ret);

  ret = mach_port_move_member (mach_task_self (),
			       inferior_exception_port,
			       inferior_wait_port_set);
  CHK ("mach_port_move_member", ret);

  ret = task_get_special_port (inferior_task,
			       TASK_EXCEPTION_PORT,
			       &inferior_old_exception_port);
  CHK ("task_get_special_port(old exc)", ret);

  ret = task_set_special_port (inferior_task,
			       TASK_EXCEPTION_PORT,
			       inferior_exception_port);
  CHK ("task_set_special_port", ret);

  ret = mach_port_deallocate (mach_task_self (),
			      inferior_exception_port);
  CHK ("mack_port_deallocate", ret);

#if 0
  /* When notify appears, the inferior_task's exception
   * port has been destroyed.
   *
   * Not used, since the dead_name_notification already
   * appears when task dies.
   *
   */
  request_notify (inferior_exception_port,
		  MACH_NOTIFY_NO_SENDERS,
		  MACH_TYPE_EXCEPTION_PORT);
#endif
}

/* Nonzero if gdb is waiting for a message */
int mach_really_waiting;

/* Wait for the inferior to stop for some reason.
   - Loop on notifications until inferior_task dies.
   - Loop on exceptions until stopped_in_exception comes true.
   (e.g. we receive a single step trace trap)
   - a message arrives to gdb's message port

   There is no other way to exit this loop.

   Returns the inferior_pid for rest of gdb.
   Side effects: Set *OURSTATUS.  */
int
mach_really_wait (pid, ourstatus)
     int pid;
     struct target_waitstatus *ourstatus;
{
  kern_return_t ret;
  int w;

  struct msg
    {
      mach_msg_header_t header;
      mach_msg_type_t foo;
      int data[8000];
    }
  in_msg, out_msg;

  /* Either notify (death), exception or message can stop the inferior */
  stopped_in_exception = FALSE;

  while (1)
    {
      QUIT;

      stop_exception = stop_code = stop_subcode = -1;
      stop_thread = MACH_PORT_NULL;

      mach_really_waiting = 1;
      ret = mach_msg (&in_msg.header,	/* header */
		      MACH_RCV_MSG,	/* options */
		      0,	/* send size */
		      sizeof (struct msg),	/* receive size */
		      currently_waiting_for,	/* receive name */
		      MACH_MSG_TIMEOUT_NONE,
		      MACH_PORT_NULL);
      mach_really_waiting = 0;
      CHK ("mach_msg (receive)", ret);

      /* Check if we received a notify of the childs' death */
      if (notify_server (&in_msg.header, &out_msg.header))
	{
	  /* If inferior_task is null then the inferior has
	     gone away and we want to return to command level.
	     Otherwise it was just an informative message and we
	     need to look to see if there are any more. */
	  if (inferior_task != MACH_PORT_NULL)
	    continue;
	  else
	    {
	      /* Collect Unix exit status for gdb */

	      wait3 (&w, WNOHANG, 0);

	      /* This mess is here to check that the rest of
	       * gdb knows that the inferior died. It also
	       * tries to hack around the fact that Mach 3.0 (mk69)
	       * unix server (ux28) does not always know what
	       * has happened to it's children when mach-magic
	       * is applied on them.
	       */
	      if ((!WIFEXITED (w) && WIFSTOPPED (w)) ||
		  (WIFEXITED (w) && WEXITSTATUS (w) > 0377))
		{
		  WSETEXIT (w, 0);
		  warning ("Using exit value 0 for terminated task");
		}
	      else if (!WIFEXITED (w))
		{
		  int sig = WTERMSIG (w);

		  /* Signals cause problems. Warn the user. */
		  if (sig != SIGKILL)	/* Bad luck if garbage matches this */
		    warning ("The terminating signal stuff may be nonsense");
		  else if (sig > NSIG)
		    {
		      WSETEXIT (w, 0);
		      warning ("Using exit value 0 for terminated task");
		    }
		}
	      store_waitstatus (ourstatus, w);
	      return inferior_pid;
	    }
	}

      /* Hmm. Check for exception, as it was not a notification.
         exc_server() does an upcall to catch_exception_raise()
         if this rpc is an exception. Further actions are decided
         there.
       */
      if (!exc_server (&in_msg.header, &out_msg.header))
	{

	  /* Not an exception, check for message.

	   * Messages don't come from the inferior, or if they
	   * do they better be asynchronous or it will hang.
	   */
	  if (gdb_message_server (&in_msg.header))
	    continue;

	  error ("Unrecognized message received in mach_really_wait");
	}

      /* Send the reply of the exception rpc to the suspended task */
      ret = mach_msg_send (&out_msg.header);
      CHK ("mach_msg_send (exc reply)", ret);

      if (stopped_in_exception)
	{
	  /* Get unix state. May be changed in mach3_exception_actions() */
	  wait3 (&w, WNOHANG, 0);

	  mach3_exception_actions (&w, FALSE, "Task");

	  store_waitstatus (ourstatus, w);
	  return inferior_pid;
	}
    }
}

/* Called by macro DO_QUIT() in utils.c(quit).
 * This is called just before calling error() to return to command level
 */
void
mach3_quit ()
{
  int mid;
  kern_return_t ret;

  if (mach_really_waiting)
    {
      ret = task_suspend (inferior_task);

      if (ret != KERN_SUCCESS)
	{
	  warning ("Could not suspend task for interrupt: %s",
		   mach_error_string (ret));
	  mach_really_waiting = 0;
	  return;
	}
    }

  must_suspend_thread = 0;
  mach_really_waiting = 0;

  mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD);
  if (mid == -1)
    {
      warning ("Selecting first existing kernel thread");
      mid = 0;
    }

  current_thread = MACH_PORT_NULL;	/* Force setup */
  select_thread (inferior_task, mid, 1);

  return;
}

#if 0
/* bogus bogus bogus.  It is NOT OK to quit out of target_wait.  */

/* If ^C is typed when we are waiting for a message
 * and your Unix server is able to notice that we 
 * should quit now.
 *
 * Called by REQUEST_QUIT() from utils.c(request_quit)
 */
void
mach3_request_quit ()
{
  if (mach_really_waiting)
    immediate_quit = 1;
}
#endif

/*
 * Gdb message server.
 * Currently implemented is the STOP message, that causes
 * gdb to return to the command level like ^C had been typed from terminal.
 */
int
gdb_message_server (InP)
     mach_msg_header_t *InP;
{
  kern_return_t ret;
  int mid;

  if (InP->msgh_local_port == our_message_port)
    {
      /* A message coming to our_message_port. Check validity */
      switch (InP->msgh_id)
	{

	case GDB_MESSAGE_ID_STOP:
	  ret = task_suspend (inferior_task);
	  if (ret != KERN_SUCCESS)
	    warning ("Could not suspend task for stop message: %s",
		     mach_error_string (ret));

	  /* QUIT in mach_really_wait() loop. */
	  request_quit (0);
	  break;

	default:
	  warning ("Invalid message id %d received, ignored.",
		   InP->msgh_id);
	  break;
	}

      return 1;
    }

  /* Message not handled by this server */
  return 0;
}

/* NOTE: This is not an RPC call. It is a simpleroutine.

 * This is not called from this gdb code.
 *
 * It may be called by another debugger to cause this
 * debugger to enter command level:
 *
 *            (gdb) set stop_inferior_gdb ()
 *            (gdb) continue
 *
 * External program "stop-gdb" implements this also.
 */
void
stop_inferior_gdb ()
{
  kern_return_t ret;

  /* Code generated by mig, with minor cleanups :-)

   * simpleroutine stop_inferior_gdb (our_message_port : mach_port_t);
   */

  typedef struct
    {
      mach_msg_header_t Head;
    }
  Request;

  Request Mess;

  register Request *InP = &Mess;

  InP->Head.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND, 0);

  /* msgh_size passed as argument */
  InP->Head.msgh_remote_port = our_message_port;
  InP->Head.msgh_local_port = MACH_PORT_NULL;
  InP->Head.msgh_seqno = 0;
  InP->Head.msgh_id = GDB_MESSAGE_ID_STOP;

  ret = mach_msg (&InP->Head,
		  MACH_SEND_MSG | MACH_MSG_OPTION_NONE,
		  sizeof (Request),
		  0,
		  MACH_PORT_NULL,
		  MACH_MSG_TIMEOUT_NONE,
		  MACH_PORT_NULL);
}

#ifdef THREAD_ALLOWED_TO_BREAK
/*
 * Return 1 if the MID specifies the thread that caused the
 * last exception.
 *  Since catch_exception_raise() selects the thread causing
 * the last exception to current_thread, we just check that
 * it is selected and the last exception was a breakpoint.
 */
int
mach_thread_for_breakpoint (mid)
     int mid;
{
  int cmid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD);

  if (mid < 0)
    {
      mid = map_slot_to_mid (-(mid + 1), 0, 0);
      if (mid < 0)
	return 0;		/* Don't stop, no such slot */
    }

  if (!mid || cmid == -1)
    return 1;			/* stop */

  return cmid == mid && stop_exception == EXC_BREAKPOINT;
}
#endif /* THREAD_ALLOWED_TO_BREAK */

#ifdef THREAD_PARSE_ID
/*
 * Map a thread id string (MID or a @SLOTNUMBER)
 * to a thread-id.
 *
 *   0  matches all threads.
 *   Otherwise the meaning is defined only in this file.
 *   (mach_thread_for_breakpoint uses it)
 *
 * @@ This allows non-existent MIDs to be specified.
 *    It now also allows non-existent slots to be
 *    specified. (Slot numbers stored are negative,
 *    and the magnitude is one greater than the actual
 *    slot index. (Since 0 is reserved))
 */
int
mach_thread_parse_id (arg)
     char *arg;
{
  int mid;
  if (arg == 0)
    error ("thread id excpected");
  mid = parse_thread_id (arg, 0, 1);

  return mid;
}
#endif /* THREAD_PARSE_ID */

#ifdef THREAD_OUTPUT_ID
char *
mach_thread_output_id (mid)
     int mid;
{
  static char foobar[20];

  if (mid > 0)
    sprintf (foobar, "mid %d", mid);
  else if (mid < 0)
    sprintf (foobar, "@%d", -(mid + 1));
  else
    sprintf (foobar, "*any thread*");

  return foobar;
}
#endif /* THREAD_OUTPUT_ID */

/* Called with hook PREPARE_TO_PROCEED() from infrun.c.

 * If we have switched threads and stopped at breakpoint return 1 otherwise 0.
 *
 *  if SELECT_IT is nonzero, reselect the thread that was active when
 *  we stopped at a breakpoint.
 *
 */

mach3_prepare_to_proceed (select_it)
     int select_it;
{
  if (stop_thread &&
      stop_thread != current_thread &&
      stop_exception == EXC_BREAKPOINT)
    {
      int mid;

      if (!select_it)
	return 1;

      mid = switch_to_thread (stop_thread);

      return 1;
    }

  return 0;
}

/* this stuff here is an upcall via libmach/excServer.c 
   and mach_really_wait which does the actual upcall.

   The code will pass the exception to the inferior if:

   - The task that signaled is not the inferior task
   (e.g. when debugging another debugger)

   - The user has explicitely requested to pass on the exceptions.
   (e.g to the default unix exception handler, which maps
   exceptions to signals, or the user has her own exception handler)

   - If the thread that signaled is being single-stepped and it
   has set it's own exception port and the exception is not
   EXC_BREAKPOINT. (Maybe this is not desirable?)
 */

kern_return_t
catch_exception_raise (port, thread, task, exception, code, subcode)
     mach_port_t port;
     thread_t thread;
     task_t task;
     int exception, code, subcode;
{
  kern_return_t ret;
  boolean_t signal_thread;
  int mid = map_port_name_to_mid (thread, MACH_TYPE_THREAD);

  if (!MACH_PORT_VALID (thread))
    {
      /* If the exception was sent and thread dies before we
         receive it, THREAD will be MACH_PORT_DEAD
       */

      current_thread = thread = MACH_PORT_NULL;
      error ("Received exception from nonexistent thread");
    }

  /* Check if the task died in transit.
   * @@ Isn't the thread also invalid in such case?
   */
  if (!MACH_PORT_VALID (task))
    {
      current_thread = thread = MACH_PORT_NULL;
      error ("Received exception from nonexistent task");
    }

  if (exception < 0 || exception > MAX_EXCEPTION)
    internal_error ("catch_exception_raise: unknown exception code %d thread %d",
		    exception,
		    mid);

  if (!MACH_PORT_VALID (inferior_task))
    error ("got an exception, but inferior_task is null or dead");

  stop_exception = exception;
  stop_code = code;
  stop_subcode = subcode;
  stop_thread = thread;

  signal_thread = exception != EXC_BREAKPOINT &&
    port == singlestepped_thread_port &&
    MACH_PORT_VALID (thread_saved_exception_port);

  /* If it was not our inferior or if we want to forward
   * the exception to the inferior's handler, do it here
   *
   * Note: If you have forwarded EXC_BREAKPOINT I trust you know why.
   */
  if (task != inferior_task ||
      signal_thread ||
      exception_map[exception].forward)
    {
      mach_port_t eport = inferior_old_exception_port;

      if (signal_thread)
	{
	  /*
	     GDB now forwards the exeption to thread's original handler,
	     since the user propably knows what he is doing.
	     Give a message, though.
	   */

	  mach3_exception_actions ((WAITTYPE *) NULL, TRUE, "Thread");
	  eport = thread_saved_exception_port;
	}

      /* Send the exception to the original handler */
      ret = exception_raise (eport,
			     thread,
			     task,
			     exception,
			     code,
			     subcode);

      (void) mach_port_deallocate (mach_task_self (), task);
      (void) mach_port_deallocate (mach_task_self (), thread);

      /* If we come here, we don't want to trace any more, since we
       * will never stop for tracing anyway.
       */
      discard_single_step (thread);

      /* Do not stop the inferior */
      return ret;
    }

  /* Now gdb handles the exception */
  stopped_in_exception = TRUE;

  ret = task_suspend (task);
  CHK ("Error suspending inferior after exception", ret);

  must_suspend_thread = 0;

  if (current_thread != thread)
    {
      if (MACH_PORT_VALID (singlestepped_thread_port))
	/* Cleanup discards single stepping */
	error ("Exception from thread %d while singlestepping thread %d",
	       mid,
	       map_port_name_to_mid (current_thread, MACH_TYPE_THREAD));

      /* Then select the thread that caused the exception */
      if (select_thread (inferior_task, mid, 0) != KERN_SUCCESS)
	error ("Could not select thread %d causing exception", mid);
      else
	warning ("Gdb selected thread %d", mid);
    }

  /* If we receive an exception that is not breakpoint
   * exception, we interrupt the single step and return to
   * debugger. Trace condition is cleared.
   */
  if (MACH_PORT_VALID (singlestepped_thread_port))
    {
      if (stop_exception != EXC_BREAKPOINT)
	warning ("Single step interrupted by exception");
      else if (port == singlestepped_thread_port)
	{
	  /* Single step exception occurred, remove trace bit
	   * and return to gdb.
	   */
	  if (!MACH_PORT_VALID (current_thread))
	    error ("Single stepped thread is not valid");

	  /* Resume threads, but leave the task suspended */
	  resume_all_threads (0);
	}
      else
	warning ("Breakpoint while single stepping?");

      discard_single_step (current_thread);
    }

  (void) mach_port_deallocate (mach_task_self (), task);
  (void) mach_port_deallocate (mach_task_self (), thread);

  return KERN_SUCCESS;
}

int
port_valid (port, mask)
     mach_port_t port;
     int mask;
{
  kern_return_t ret;
  mach_port_type_t type;

  ret = mach_port_type (mach_task_self (),
			port,
			&type);
  if (ret != KERN_SUCCESS || (type & mask) != mask)
    return 0;
  return 1;
}

/* @@ No vm read cache implemented yet */
boolean_t vm_read_cache_valid = FALSE;

/*
 * Read inferior task's LEN bytes from ADDR and copy it to MYADDR
 * in gdb's address space.
 *
 * Return 0 on failure; number of bytes read otherwise.
 */
int
mach3_read_inferior (addr, myaddr, length)
     CORE_ADDR addr;
     char *myaddr;
     int length;
{
  kern_return_t ret;
  vm_address_t low_address = (vm_address_t) trunc_page (addr);
  vm_size_t aligned_length =
  (vm_size_t) round_page (addr + length) - low_address;
  pointer_t copied_memory;
  int copy_count;

  /* Get memory from inferior with page aligned addresses */
  ret = vm_read (inferior_task,
		 low_address,
		 aligned_length,
		 &copied_memory,
		 &copy_count);
  if (ret != KERN_SUCCESS)
    {
      /* the problem is that the inferior might be killed for whatever reason
       * before we go to mach_really_wait. This is one place that ought to
       * catch many of those errors.
       * @@ A better fix would be to make all external events to GDB
       * to arrive via a SINGLE port set. (Including user input!)
       */

      if (!port_valid (inferior_task, MACH_PORT_TYPE_SEND))
	{
	  m3_kill_inferior ();
	  error ("Inferior killed (task port invalid)");
	}
      else
	{
#ifdef OSF
	  extern int errno;
	  /* valprint.c gives nicer format if this does not
	     screw it. Eamonn seems to like this, so I enable
	     it if OSF is defined...
	   */
	  warning ("[read inferior %x failed: %s]",
		   addr, mach_error_string (ret));
	  errno = 0;
#endif
	  return 0;
	}
    }

  memcpy (myaddr, (char *) addr - low_address + copied_memory, length);

  ret = vm_deallocate (mach_task_self (),
		       copied_memory,
		       copy_count);
  CHK ("mach3_read_inferior vm_deallocate failed", ret);

  return length;
}

#ifdef __STDC__
#define CHK_GOTO_OUT(str,ret) \
  do if (ret != KERN_SUCCESS) { errstr = #str; goto out; } while(0)
#else
#define CHK_GOTO_OUT(str,ret) \
  do if (ret != KERN_SUCCESS) { errstr = str; goto out; } while(0)
#endif

struct vm_region_list
{
  struct vm_region_list *next;
  vm_prot_t protection;
  vm_address_t start;
  vm_size_t length;
};

struct obstack region_obstack;

/*
 * Write inferior task's LEN bytes from ADDR and copy it to MYADDR
 * in gdb's address space.
 */
int
mach3_write_inferior (addr, myaddr, length)
     CORE_ADDR addr;
     char *myaddr;
     int length;
{
  kern_return_t ret;
  vm_address_t low_address = (vm_address_t) trunc_page (addr);
  vm_size_t aligned_length =
  (vm_size_t) round_page (addr + length) - low_address;
  pointer_t copied_memory;
  int copy_count;
  int deallocate = 0;

  char *errstr = "Bug in mach3_write_inferior";

  struct vm_region_list *region_element;
  struct vm_region_list *region_head = (struct vm_region_list *) NULL;

  /* Get memory from inferior with page aligned addresses */
  ret = vm_read (inferior_task,
		 low_address,
		 aligned_length,
		 &copied_memory,
		 &copy_count);
  CHK_GOTO_OUT ("mach3_write_inferior vm_read failed", ret);

  deallocate++;

  memcpy ((char *) addr - low_address + copied_memory, myaddr, length);

  obstack_init (&region_obstack);

  /* Do writes atomically.
   * First check for holes and unwritable memory.
   */
  {
    vm_size_t remaining_length = aligned_length;
    vm_address_t region_address = low_address;

    struct vm_region_list *scan;

    while (region_address < low_address + aligned_length)
      {
	vm_prot_t protection;
	vm_prot_t max_protection;
	vm_inherit_t inheritance;
	boolean_t shared;
	mach_port_t object_name;
	vm_offset_t offset;
	vm_size_t region_length = remaining_length;
	vm_address_t old_address = region_address;

	ret = vm_region (inferior_task,
			 &region_address,
			 &region_length,
			 &protection,
			 &max_protection,
			 &inheritance,
			 &shared,
			 &object_name,
			 &offset);
	CHK_GOTO_OUT ("vm_region failed", ret);

	/* Check for holes in memory */
	if (old_address != region_address)
	  {
	    warning ("No memory at 0x%x. Nothing written",
		     old_address);
	    ret = KERN_SUCCESS;
	    length = 0;
	    goto out;
	  }

	if (!(max_protection & VM_PROT_WRITE))
	  {
	    warning ("Memory at address 0x%x is unwritable. Nothing written",
		     old_address);
	    ret = KERN_SUCCESS;
	    length = 0;
	    goto out;
	  }

	/* Chain the regions for later use */
	region_element =
	  (struct vm_region_list *)
	  obstack_alloc (&region_obstack, sizeof (struct vm_region_list));

	region_element->protection = protection;
	region_element->start = region_address;
	region_element->length = region_length;

	/* Chain the regions along with protections */
	region_element->next = region_head;
	region_head = region_element;

	region_address += region_length;
	remaining_length = remaining_length - region_length;
      }

    /* If things fail after this, we give up.
     * Somebody is messing up inferior_task's mappings.
     */

    /* Enable writes to the chained vm regions */
    for (scan = region_head; scan; scan = scan->next)
      {
	boolean_t protection_changed = FALSE;

	if (!(scan->protection & VM_PROT_WRITE))
	  {
	    ret = vm_protect (inferior_task,
			      scan->start,
			      scan->length,
			      FALSE,
			      scan->protection | VM_PROT_WRITE);
	    CHK_GOTO_OUT ("vm_protect: enable write failed", ret);
	  }
      }

    ret = vm_write (inferior_task,
		    low_address,
		    copied_memory,
		    aligned_length);
    CHK_GOTO_OUT ("vm_write failed", ret);

    /* Set up the original region protections, if they were changed */
    for (scan = region_head; scan; scan = scan->next)
      {
	boolean_t protection_changed = FALSE;

	if (!(scan->protection & VM_PROT_WRITE))
	  {
	    ret = vm_protect (inferior_task,
			      scan->start,
			      scan->length,
			      FALSE,
			      scan->protection);
	    CHK_GOTO_OUT ("vm_protect: enable write failed", ret);
	  }
      }
  }

out:
  if (deallocate)
    {
      obstack_free (&region_obstack, 0);

      (void) vm_deallocate (mach_task_self (),
			    copied_memory,
			    copy_count);
    }

  if (ret != KERN_SUCCESS)
    {
      warning ("%s %s", errstr, mach_error_string (ret));
      return 0;
    }

  return length;
}

/* Return 0 on failure, number of bytes handled otherwise.  */
static int
m3_xfer_memory (memaddr, myaddr, len, write, target)
     CORE_ADDR memaddr;
     char *myaddr;
     int len;
     int write;
     struct target_ops *target;	/* IGNORED */
{
  int result;

  if (write)
    result = mach3_write_inferior (memaddr, myaddr, len);
  else
    result = mach3_read_inferior (memaddr, myaddr, len);

  return result;
}


static char *
translate_state (state)
     int state;
{
  switch (state)
    {
    case TH_STATE_RUNNING:
      return ("R");
    case TH_STATE_STOPPED:
      return ("S");
    case TH_STATE_WAITING:
      return ("W");
    case TH_STATE_UNINTERRUPTIBLE:
      return ("U");
    case TH_STATE_HALTED:
      return ("H");
    default:
      return ("?");
    }
}

static char *
translate_cstate (state)
     int state;
{
  switch (state)
    {
    case CPROC_RUNNING:
      return "R";
    case CPROC_SWITCHING:
      return "S";
    case CPROC_BLOCKED:
      return "B";
    case CPROC_CONDWAIT:
      return "C";
    case CPROC_CONDWAIT | CPROC_SWITCHING:
      return "CS";
    default:
      return "?";
    }
}

/* type == MACH_MSG_TYPE_COPY_SEND || type == MACH_MSG_TYPE_MAKE_SEND */

mach_port_t			/* no mach_port_name_t found in include files. */
map_inferior_port_name (inferior_name, type)
     mach_port_t inferior_name;
     mach_msg_type_name_t type;
{
  kern_return_t ret;
  mach_msg_type_name_t acquired;
  mach_port_t iport;

  ret = mach_port_extract_right (inferior_task,
				 inferior_name,
				 type,
				 &iport,
				 &acquired);
  CHK ("mach_port_extract_right (map_inferior_port_name)", ret);

  if (acquired != MACH_MSG_TYPE_PORT_SEND)
    error ("Incorrect right extracted, (map_inferior_port_name)");

  ret = mach_port_deallocate (mach_task_self (),
			      iport);
  CHK ("Deallocating mapped port (map_inferior_port_name)", ret);

  return iport;
}

/*
 * Naming convention:
 *  Always return user defined name if found.
 *  _K == A kernel thread with no matching CPROC
 *  _C == A cproc with no current cthread
 *  _t == A cthread with no user defined name
 *
 * The digits that follow the _names are the SLOT number of the
 * kernel thread if there is such a thing, otherwise just a negation
 * of the sequential number of such cprocs.
 */

static char buf[7];

static char *
get_thread_name (one_cproc, id)
     gdb_thread_t one_cproc;
     int id;
{
  if (one_cproc)
    if (one_cproc->cthread == NULL)
      {
	/* cproc not mapped to any cthread */
	sprintf (buf, "_C%d", id);
      }
    else if (!one_cproc->cthread->name)
      {
	/* cproc and cthread, but no name */
	sprintf (buf, "_t%d", id);
      }
    else
      return (char *) (one_cproc->cthread->name);
  else
    {
      if (id < 0)
	warning ("Inconsistency in thread name id %d", id);

      /* Kernel thread without cproc */
      sprintf (buf, "_K%d", id);
    }

  return buf;
}

int
fetch_thread_info (task, mthreads_out)
     mach_port_t task;
     gdb_thread_t *mthreads_out;	/* out */
{
  kern_return_t ret;
  thread_array_t th_table;
  int th_count;
  gdb_thread_t mthreads = NULL;
  int index;

  ret = task_threads (task, &th_table, &th_count);
  if (ret != KERN_SUCCESS)
    {
      warning ("Error getting inferior's thread list:%s",
	       mach_error_string (ret));
      m3_kill_inferior ();
      return -1;
    }

  mthreads = (gdb_thread_t)
    obstack_alloc
    (cproc_obstack,
     th_count * sizeof (struct gdb_thread));

  for (index = 0; index < th_count; index++)
    {
      thread_t saved_thread = MACH_PORT_NULL;
      int mid;

      if (must_suspend_thread)
	setup_thread (th_table[index], 1);

      if (th_table[index] != current_thread)
	{
	  saved_thread = current_thread;

	  mid = switch_to_thread (th_table[index]);
	}

      mthreads[index].name = th_table[index];
      mthreads[index].cproc = NULL;	/* map_cprocs_to_kernel_threads() */
      mthreads[index].in_emulator = FALSE;
      mthreads[index].slotid = index;

      mthreads[index].sp = read_register (SP_REGNUM);
      mthreads[index].fp = read_register (FP_REGNUM);
      mthreads[index].pc = read_pc ();

      if (MACH_PORT_VALID (saved_thread))
	mid = switch_to_thread (saved_thread);

      if (must_suspend_thread)
	setup_thread (th_table[index], 0);
    }

  consume_send_rights (th_table, th_count);
  ret = vm_deallocate (mach_task_self (), (vm_address_t) th_table,
		       (th_count * sizeof (mach_port_t)));
  if (ret != KERN_SUCCESS)
    {
      warning ("Error trying to deallocate thread list : %s",
	       mach_error_string (ret));
    }

  *mthreads_out = mthreads;

  return th_count;
}


/*
 * Current emulator always saves the USP on top of
 * emulator stack below struct emul_stack_top stuff.
 */
CORE_ADDR
fetch_usp_from_emulator_stack (sp)
     CORE_ADDR sp;
{
  CORE_ADDR stack_pointer;

  sp = (sp & ~(EMULATOR_STACK_SIZE - 1)) +
    EMULATOR_STACK_SIZE - sizeof (struct emul_stack_top);

  if (mach3_read_inferior (sp,
			   &stack_pointer,
			   sizeof (CORE_ADDR)) != sizeof (CORE_ADDR))
    {
      warning ("Can't read user sp from emulator stack address 0x%x", sp);
      return 0;
    }

  return stack_pointer;
}

#ifdef MK67

/* get_emulation_vector() interface was changed after mk67 */
#define EMUL_VECTOR_COUNT 400	/* Value does not matter too much */

#endif /* MK67 */

/* Check if the emulator exists at task's address space.
 */
boolean_t
have_emulator_p (task)
     task_t task;
{
  kern_return_t ret;
#ifndef EMUL_VECTOR_COUNT
  vm_offset_t *emulation_vector;
  int n;
#else
  vm_offset_t emulation_vector[EMUL_VECTOR_COUNT];
  int n = EMUL_VECTOR_COUNT;
#endif
  int i;
  int vector_start;

  ret = task_get_emulation_vector (task,
				   &vector_start,
#ifndef EMUL_VECTOR_COUNT
				   &emulation_vector,
#else
				   emulation_vector,
#endif
				   &n);
  CHK ("task_get_emulation_vector", ret);
  xx_debug ("%d vectors from %d at 0x%08x\n",
	    n, vector_start, emulation_vector);

  for (i = 0; i < n; i++)
    {
      vm_offset_t entry = emulation_vector[i];

      if (EMULATOR_BASE <= entry && entry <= EMULATOR_END)
	return TRUE;
      else if (entry)
	{
	  static boolean_t informed = FALSE;
	  if (!informed)
	    {
	      warning ("Emulation vector address 0x08%x outside emulator space",
		       entry);
	      informed = TRUE;
	    }
	}
    }
  return FALSE;
}

/* Map cprocs to kernel threads and vice versa.  */

void
map_cprocs_to_kernel_threads (cprocs, mthreads, thread_count)
     gdb_thread_t cprocs;
     gdb_thread_t mthreads;
     int thread_count;
{
  int index;
  gdb_thread_t scan;
  boolean_t all_mapped = TRUE;
  LONGEST stack_base;
  LONGEST stack_size;

  for (scan = cprocs; scan; scan = scan->next)
    {
      /* Default to: no kernel thread for this cproc */
      scan->reverse_map = -1;

      /* Check if the cproc is found by its stack */
      for (index = 0; index < thread_count; index++)
	{
	  stack_base =
	    extract_signed_integer (scan->raw_cproc + CPROC_BASE_OFFSET,
				    CPROC_BASE_SIZE);
	  stack_size =
	    extract_signed_integer (scan->raw_cproc + CPROC_SIZE_OFFSET,
				    CPROC_SIZE_SIZE);
	  if ((mthreads + index)->sp > stack_base &&
	      (mthreads + index)->sp <= stack_base + stack_size)
	    {
	      (mthreads + index)->cproc = scan;
	      scan->reverse_map = index;
	      break;
	    }
	}
      all_mapped &= (scan->reverse_map != -1);
    }

  /* Check for threads that are currently in the emulator.
   * If so, they have a different stack, and the still unmapped
   * cprocs may well get mapped to these threads.
   * 
   * If:
   *  - cproc stack does not match any kernel thread stack pointer
   *  - there is at least one extra kernel thread
   *    that has no cproc mapped above.
   *  - some kernel thread stack pointer points to emulator space
   *  then we find the user stack pointer saved in the emulator
   *  stack, and try to map that to the cprocs.
   *
   * Also set in_emulator for kernel threads.
   */

  if (emulator_present)
    {
      for (index = 0; index < thread_count; index++)
	{
	  CORE_ADDR emul_sp;
	  CORE_ADDR usp;

	  gdb_thread_t mthread = (mthreads + index);
	  emul_sp = mthread->sp;

	  if (mthread->cproc == NULL &&
	      EMULATOR_BASE <= emul_sp && emul_sp <= EMULATOR_END)
	    {
	      mthread->in_emulator = emulator_present;

	      if (!all_mapped && cprocs)
		{
		  usp = fetch_usp_from_emulator_stack (emul_sp);

		  /* @@ Could be more accurate */
		  if (!usp)
		    error ("Zero stack pointer read from emulator?");

		  /* Try to match this stack pointer to the cprocs that
		   * don't yet have a kernel thread.
		   */
		  for (scan = cprocs; scan; scan = scan->next)
		    {

		      /* Check is this unmapped CPROC stack contains
		       * the user stack pointer saved in the
		       * emulator.
		       */
		      if (scan->reverse_map == -1)
			{
			  stack_base =
			    extract_signed_integer
			    (scan->raw_cproc + CPROC_BASE_OFFSET,
			     CPROC_BASE_SIZE);
			  stack_size =
			    extract_signed_integer
			    (scan->raw_cproc + CPROC_SIZE_OFFSET,
			     CPROC_SIZE_SIZE);
			  if (usp > stack_base &&
			      usp <= stack_base + stack_size)
			    {
			      mthread->cproc = scan;
			      scan->reverse_map = index;
			      break;
			    }
			}
		    }
		}
	    }
	}
    }
}

/*
 * Format of the thread_list command
 *
 *                   slot mid sel   name  emul ks susp  cstate wired   address
 */
#define TL_FORMAT "%-2.2s %5d%c %-10.10s %1.1s%s%-5.5s %-2.2s %-5.5s "

#define TL_HEADER "\n@    MID  Name        KState CState   Where\n"

void
print_tl_address (stream, pc)
     struct ui_file *stream;
     CORE_ADDR pc;
{
  if (!lookup_minimal_symbol_by_pc (pc))
    fprintf_filtered (stream, local_hex_format (), pc);
  else
    {
      extern int addressprint;
      extern int asm_demangle;

      int store = addressprint;
      addressprint = 0;
      print_address_symbolic (pc, stream, asm_demangle, "");
      addressprint = store;
    }
}

/* For thread names, but also for gdb_message_port external name */
#define MAX_NAME_LEN 50

/* Returns the address of variable NAME or 0 if not found */
CORE_ADDR
lookup_address_of_variable (name)
     char *name;
{
  struct symbol *sym;
  CORE_ADDR symaddr = 0;
  struct minimal_symbol *msymbol;

  sym = lookup_symbol (name,
		       (struct block *) NULL,
		       VAR_NAMESPACE,
		       (int *) NULL,
		       (struct symtab **) NULL);

  if (sym)
    symaddr = SYMBOL_VALUE (sym);

  if (!symaddr)
    {
      msymbol = lookup_minimal_symbol (name, NULL, NULL);

      if (msymbol && msymbol->type == mst_data)
	symaddr = SYMBOL_VALUE_ADDRESS (msymbol);
    }

  return symaddr;
}

static gdb_thread_t
get_cprocs ()
{
  gdb_thread_t cproc_head;
  gdb_thread_t cproc_copy;
  CORE_ADDR their_cprocs;
  char *buf[TARGET_PTR_BIT / HOST_CHAR_BIT];
  char *name;
  cthread_t cthread;
  CORE_ADDR symaddr;

  symaddr = lookup_address_of_variable ("cproc_list");

  if (!symaddr)
    {
      /* cproc_list is not in a file compiled with debugging
         symbols, but don't give up yet */

      symaddr = lookup_address_of_variable ("cprocs");

      if (symaddr)
	{
	  static int informed = 0;
	  if (!informed)
	    {
	      informed++;
	      warning ("Your program is loaded with an old threads library.");
	      warning ("GDB does not know the old form of threads");
	      warning ("so things may not work.");
	    }
	}
    }

  /* Stripped or no -lthreads loaded or "cproc_list" is in wrong segment. */
  if (!symaddr)
    return NULL;

  /* Get the address of the first cproc in the task */
  if (!mach3_read_inferior (symaddr,
			    buf,
			    TARGET_PTR_BIT / HOST_CHAR_BIT))
    error ("Can't read cproc master list at address (0x%x).", symaddr);
  their_cprocs = extract_address (buf, TARGET_PTR_BIT / HOST_CHAR_BIT);

  /* Scan the CPROCs in the task.
     CPROCs are chained with LIST field, not NEXT field, which
     chains mutexes, condition variables and queues */

  cproc_head = NULL;

  while (their_cprocs != (CORE_ADDR) 0)
    {
      CORE_ADDR cproc_copy_incarnation;
      cproc_copy = (gdb_thread_t) obstack_alloc (cproc_obstack,
						 sizeof (struct gdb_thread));

      if (!mach3_read_inferior (their_cprocs,
				&cproc_copy->raw_cproc[0],
				CPROC_SIZE))
	error ("Can't read next cproc at 0x%x.", their_cprocs);

      their_cprocs =
	extract_address (cproc_copy->raw_cproc + CPROC_LIST_OFFSET,
			 CPROC_LIST_SIZE);
      cproc_copy_incarnation =
	extract_address (cproc_copy->raw_cproc + CPROC_INCARNATION_OFFSET,
			 CPROC_INCARNATION_SIZE);

      if (cproc_copy_incarnation == (CORE_ADDR) 0)
	cproc_copy->cthread = NULL;
      else
	{
	  /* This CPROC has an attached CTHREAD. Get its name */
	  cthread = (cthread_t) obstack_alloc (cproc_obstack,
					       sizeof (struct cthread));

	  if (!mach3_read_inferior (cproc_copy_incarnation,
				    cthread,
				    sizeof (struct cthread)))
	      error ("Can't read next thread at 0x%x.",
		     cproc_copy_incarnation);

	  cproc_copy->cthread = cthread;

	  if (cthread->name)
	    {
	      name = (char *) obstack_alloc (cproc_obstack, MAX_NAME_LEN);

	      if (!mach3_read_inferior (cthread->name, name, MAX_NAME_LEN))
		error ("Can't read next thread's name at 0x%x.", cthread->name);

	      cthread->name = name;
	    }
	}

      /* insert in front */
      cproc_copy->next = cproc_head;
      cproc_head = cproc_copy;
    }
  return cproc_head;
}

#ifndef FETCH_CPROC_STATE
/*
 * Check if your machine does not grok the way this routine
 * fetches the FP,PC and SP of a cproc that is not
 * currently attached to any kernel thread (e.g. its cproc.context
 * field points to the place in stack where the context
 * is saved).
 *
 * If it doesn't, define your own routine.
 */
#define FETCH_CPROC_STATE(mth) mach3_cproc_state (mth)

int
mach3_cproc_state (mthread)
     gdb_thread_t mthread;
{
  int context;

  if (!mthread || !mthread->cproc)
    return -1;

  context = extract_signed_integer
    (mthread->cproc->raw_cproc + CPROC_CONTEXT_OFFSET,
     CPROC_CONTEXT_SIZE);
  if (context == 0)
    return -1;

  mthread->sp = context + MACHINE_CPROC_SP_OFFSET;

  if (mach3_read_inferior (context + MACHINE_CPROC_PC_OFFSET,
			   &mthread->pc,
			   sizeof (CORE_ADDR)) != sizeof (CORE_ADDR))
    {
      warning ("Can't read cproc pc from inferior");
      return -1;
    }

  if (mach3_read_inferior (context + MACHINE_CPROC_FP_OFFSET,
			   &mthread->fp,
			   sizeof (CORE_ADDR)) != sizeof (CORE_ADDR))
    {
      warning ("Can't read cproc fp from inferior");
      return -1;
    }

  return 0;
}
#endif /* FETCH_CPROC_STATE */


void
thread_list_command ()
{
  thread_basic_info_data_t ths;
  int thread_count;
  gdb_thread_t cprocs;
  gdb_thread_t scan;
  int index;
  char *name;
  char selected;
  char *wired;
  int infoCnt;
  kern_return_t ret;
  mach_port_t mid_or_port;
  gdb_thread_t their_threads;
  gdb_thread_t kthread;

  int neworder = 1;

  char *fmt = "There are %d kernel threads in task %d.\n";

  int tmid = map_port_name_to_mid (inferior_task, MACH_TYPE_TASK);

  MACH_ERROR_NO_INFERIOR;

  thread_count = fetch_thread_info (inferior_task,
				    &their_threads);
  if (thread_count == -1)
    return;

  if (thread_count == 1)
    fmt = "There is %d kernel thread in task %d.\n";

  printf_filtered (fmt, thread_count, tmid);

  puts_filtered (TL_HEADER);

  cprocs = get_cprocs ();

  map_cprocs_to_kernel_threads (cprocs, their_threads, thread_count);

  for (scan = cprocs; scan; scan = scan->next)
    {
      int mid;
      char buf[10];
      char slot[3];
      int cproc_state =
      extract_signed_integer
      (scan->raw_cproc + CPROC_STATE_OFFSET, CPROC_STATE_SIZE);

      selected = ' ';

      /* a wired cproc? */
      wired = (extract_address (scan->raw_cproc + CPROC_WIRED_OFFSET,
				CPROC_WIRED_SIZE)
	       ? "wired" : "");

      if (scan->reverse_map != -1)
	kthread = (their_threads + scan->reverse_map);
      else
	kthread = NULL;

      if (kthread)
	{
	  /* These cprocs have a kernel thread */

	  mid = map_port_name_to_mid (kthread->name, MACH_TYPE_THREAD);

	  infoCnt = THREAD_BASIC_INFO_COUNT;

	  ret = thread_info (kthread->name,
			     THREAD_BASIC_INFO,
			     (thread_info_t) & ths,
			     &infoCnt);

	  if (ret != KERN_SUCCESS)
	    {
	      warning ("Unable to get basic info on thread %d : %s",
		       mid,
		       mach_error_string (ret));
	      continue;
	    }

	  /* Who is the first to have more than 100 threads */
	  sprintf (slot, "%d", kthread->slotid % 100);

	  if (kthread->name == current_thread)
	    selected = '*';

	  if (ths.suspend_count)
	    sprintf (buf, "%d", ths.suspend_count);
	  else
	    buf[0] = '\000';

#if 0
	  if (ths.flags & TH_FLAGS_SWAPPED)
	    strcat (buf, "S");
#endif

	  if (ths.flags & TH_FLAGS_IDLE)
	    strcat (buf, "I");

	  printf_filtered (TL_FORMAT,
			   slot,
			   mid,
			   selected,
			   get_thread_name (scan, kthread->slotid),
			   kthread->in_emulator ? "E" : "",
			   translate_state (ths.run_state),
			   buf,
			   translate_cstate (cproc_state),
			   wired);
	  print_tl_address (gdb_stdout, kthread->pc);
	}
      else
	{
	  /* These cprocs don't have a kernel thread.
	   * find out the calling frame with 
	   * FETCH_CPROC_STATE.
	   */

	  struct gdb_thread state;

#if 0
	  /* jtv -> emcmanus: why do you want this here? */
	  if (scan->incarnation == NULL)
	    continue;		/* EMcM */
#endif

	  printf_filtered (TL_FORMAT,
			   "-",
			   -neworder,	/* Pseudo MID */
			   selected,
			   get_thread_name (scan, -neworder),
			   "",
			   "-",	/* kernel state */
			   "",
			   translate_cstate (cproc_state),
			   "");
	  state.cproc = scan;

	  if (FETCH_CPROC_STATE (&state) == -1)
	    puts_filtered ("???");
	  else
	    print_tl_address (gdb_stdout, state.pc);

	  neworder++;
	}
      puts_filtered ("\n");
    }

  /* Scan for kernel threads without cprocs */
  for (index = 0; index < thread_count; index++)
    {
      if (!their_threads[index].cproc)
	{
	  int mid;

	  char buf[10];
	  char slot[3];

	  mach_port_t name = their_threads[index].name;

	  mid = map_port_name_to_mid (name, MACH_TYPE_THREAD);

	  infoCnt = THREAD_BASIC_INFO_COUNT;

	  ret = thread_info (name,
			     THREAD_BASIC_INFO,
			     (thread_info_t) & ths,
			     &infoCnt);

	  if (ret != KERN_SUCCESS)
	    {
	      warning ("Unable to get basic info on thread %d : %s",
		       mid,
		       mach_error_string (ret));
	      continue;
	    }

	  sprintf (slot, "%d", index % 100);

	  if (name == current_thread)
	    selected = '*';
	  else
	    selected = ' ';

	  if (ths.suspend_count)
	    sprintf (buf, "%d", ths.suspend_count);
	  else
	    buf[0] = '\000';

#if 0
	  if (ths.flags & TH_FLAGS_SWAPPED)
	    strcat (buf, "S");
#endif

	  if (ths.flags & TH_FLAGS_IDLE)
	    strcat (buf, "I");

	  printf_filtered (TL_FORMAT,
			   slot,
			   mid,
			   selected,
			   get_thread_name (NULL, index),
			   their_threads[index].in_emulator ? "E" : "",
			   translate_state (ths.run_state),
			   buf,
			   "",	/* No cproc state */
			   "");	/* Can't be wired */
	  print_tl_address (gdb_stdout, their_threads[index].pc);
	  puts_filtered ("\n");
	}
    }

  obstack_free (cproc_obstack, 0);
  obstack_init (cproc_obstack);
}

void
thread_select_command (args, from_tty)
     char *args;
     int from_tty;
{
  int mid;
  thread_array_t thread_list;
  int thread_count;
  kern_return_t ret;
  int is_slot = 0;

  MACH_ERROR_NO_INFERIOR;

  if (!args)
    error_no_arg ("MID or @SLOTNUMBER to specify a thread to select");

  while (*args == ' ' || *args == '\t')
    args++;

  if (*args == '@')
    {
      is_slot++;
      args++;
    }

  mid = atoi (args);

  if (mid == 0)
    if (!is_slot || *args != '0')	/* Rudimentary checks */
      error ("You must select threads by MID or @SLOTNUMBER");

  if (select_thread (inferior_task, mid, is_slot ? 2 : 1) != KERN_SUCCESS)
    return;

  if (from_tty)
    printf_filtered ("Thread %d selected\n",
		     is_slot ? map_port_name_to_mid (current_thread,
						   MACH_TYPE_THREAD) : mid);
}

thread_trace (thread, set)
     mach_port_t thread;
     boolean_t set;
{
  int flavor = TRACE_FLAVOR;
  unsigned int stateCnt = TRACE_FLAVOR_SIZE;
  kern_return_t ret;
  thread_state_data_t state;

  if (!MACH_PORT_VALID (thread))
    {
      warning ("thread_trace: invalid thread");
      return;
    }

  if (must_suspend_thread)
    setup_thread (thread, 1);

  ret = thread_get_state (thread, flavor, state, &stateCnt);
  CHK ("thread_trace: error reading thread state", ret);

  if (set)
    {
      TRACE_SET (thread, state);
    }
  else
    {
      if (!TRACE_CLEAR (thread, state))
	{
	  if (must_suspend_thread)
	    setup_thread (thread, 0);
	  return;
	}
    }

  ret = thread_set_state (thread, flavor, state, stateCnt);
  CHK ("thread_trace: error writing thread state", ret);
  if (must_suspend_thread)
    setup_thread (thread, 0);
}

#ifdef	FLUSH_INFERIOR_CACHE

/* When over-writing code on some machines the I-Cache must be flushed
   explicitly, because it is not kept coherent by the lazy hardware.
   This definitely includes breakpoints, for instance, or else we
   end up looping in mysterious Bpt traps */

flush_inferior_icache (pc, amount)
     CORE_ADDR pc;
{
  vm_machine_attribute_val_t flush = MATTR_VAL_ICACHE_FLUSH;
  kern_return_t ret;

  ret = vm_machine_attribute (inferior_task,
			      pc,
			      amount,
			      MATTR_CACHE,
			      &flush);
  if (ret != KERN_SUCCESS)
    warning ("Error flushing inferior's cache : %s",
	     mach_error_string (ret));
}
#endif /* FLUSH_INFERIOR_CACHE */


static
suspend_all_threads (from_tty)
     int from_tty;
{
  kern_return_t ret;
  thread_array_t thread_list;
  int thread_count, index;
  int infoCnt;
  thread_basic_info_data_t th_info;


  ret = task_threads (inferior_task, &thread_list, &thread_count);
  if (ret != KERN_SUCCESS)
    {
      warning ("Could not suspend inferior threads.");
      m3_kill_inferior ();
      return_to_top_level (RETURN_ERROR);
    }

  for (index = 0; index < thread_count; index++)
    {
      int mid;

      mid = map_port_name_to_mid (thread_list[index],
				  MACH_TYPE_THREAD);

      ret = thread_suspend (thread_list[index]);

      if (ret != KERN_SUCCESS)
	warning ("Error trying to suspend thread %d : %s",
		 mid, mach_error_string (ret));

      if (from_tty)
	{
	  infoCnt = THREAD_BASIC_INFO_COUNT;
	  ret = thread_info (thread_list[index],
			     THREAD_BASIC_INFO,
			     (thread_info_t) & th_info,
			     &infoCnt);
	  CHK ("suspend can't get thread info", ret);

	  warning ("Thread %d suspend count is %d",
		   mid, th_info.suspend_count);
	}
    }

  consume_send_rights (thread_list, thread_count);
  ret = vm_deallocate (mach_task_self (),
		       (vm_address_t) thread_list,
		       (thread_count * sizeof (int)));
  CHK ("Error trying to deallocate thread list", ret);
}

void
thread_suspend_command (args, from_tty)
     char *args;
     int from_tty;
{
  kern_return_t ret;
  int mid;
  mach_port_t saved_thread;
  int infoCnt;
  thread_basic_info_data_t th_info;

  MACH_ERROR_NO_INFERIOR;

  if (!strcasecmp (args, "all"))
    {
      suspend_all_threads (from_tty);
      return;
    }

  saved_thread = current_thread;

  mid = parse_thread_id (args, 0, 0);

  if (mid < 0)
    error ("You can suspend only existing kernel threads with MID or @SLOTNUMBER");

  if (mid == 0)
    mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD);
  else if (select_thread (inferior_task, mid, 0) != KERN_SUCCESS)
    {
      if (current_thread)
	current_thread = saved_thread;
      error ("Could not select thread %d", mid);
    }

  ret = thread_suspend (current_thread);
  if (ret != KERN_SUCCESS)
    warning ("thread_suspend failed : %s",
	     mach_error_string (ret));

  infoCnt = THREAD_BASIC_INFO_COUNT;
  ret = thread_info (current_thread,
		     THREAD_BASIC_INFO,
		     (thread_info_t) & th_info,
		     &infoCnt);
  CHK ("suspend can't get thread info", ret);

  warning ("Thread %d suspend count is %d", mid, th_info.suspend_count);

  current_thread = saved_thread;
}

resume_all_threads (from_tty)
     int from_tty;
{
  kern_return_t ret;
  thread_array_t thread_list;
  int thread_count, index;
  int mid;
  int infoCnt;
  thread_basic_info_data_t th_info;

  ret = task_threads (inferior_task, &thread_list, &thread_count);
  if (ret != KERN_SUCCESS)
    {
      m3_kill_inferior ();
      error ("task_threads", mach_error_string (ret));
    }

  for (index = 0; index < thread_count; index++)
    {
      infoCnt = THREAD_BASIC_INFO_COUNT;
      ret = thread_info (thread_list[index],
			 THREAD_BASIC_INFO,
			 (thread_info_t) & th_info,
			 &infoCnt);
      CHK ("resume_all can't get thread info", ret);

      mid = map_port_name_to_mid (thread_list[index],
				  MACH_TYPE_THREAD);

      if (!th_info.suspend_count)
	{
	  if (mid != -1 && from_tty)
	    warning ("Thread %d is not suspended", mid);
	  continue;
	}

      ret = thread_resume (thread_list[index]);

      if (ret != KERN_SUCCESS)
	warning ("Error trying to resume thread %d : %s",
		 mid, mach_error_string (ret));
      else if (mid != -1 && from_tty)
	warning ("Thread %d suspend count is %d",
		 mid, --th_info.suspend_count);
    }

  consume_send_rights (thread_list, thread_count);
  ret = vm_deallocate (mach_task_self (),
		       (vm_address_t) thread_list,
		       (thread_count * sizeof (int)));
  CHK ("Error trying to deallocate thread list", ret);
}

void
thread_resume_command (args, from_tty)
     char *args;
     int from_tty;
{
  int mid;
  mach_port_t saved_thread;
  kern_return_t ret;
  thread_basic_info_data_t th_info;
  int infoCnt = THREAD_BASIC_INFO_COUNT;

  MACH_ERROR_NO_INFERIOR;

  if (!strcasecmp (args, "all"))
    {
      resume_all_threads (from_tty);
      return;
    }

  saved_thread = current_thread;

  mid = parse_thread_id (args, 0, 0);

  if (mid < 0)
    error ("You can resume only existing kernel threads with MID or @SLOTNUMBER");

  if (mid == 0)
    mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD);
  else if (select_thread (inferior_task, mid, 0) != KERN_SUCCESS)
    {
      if (current_thread)
	current_thread = saved_thread;
      return_to_top_level (RETURN_ERROR);
    }

  ret = thread_info (current_thread,
		     THREAD_BASIC_INFO,
		     (thread_info_t) & th_info,
		     &infoCnt);
  CHK ("resume can't get thread info", ret);

  if (!th_info.suspend_count)
    {
      warning ("Thread %d is not suspended", mid);
      goto out;
    }

  ret = thread_resume (current_thread);
  if (ret != KERN_SUCCESS)
    warning ("thread_resume failed : %s",
	     mach_error_string (ret));
  else
    {
      th_info.suspend_count--;
      warning ("Thread %d suspend count is %d", mid, th_info.suspend_count);
    }

out:
  current_thread = saved_thread;
}

void
thread_kill_command (args, from_tty)
     char *args;
     int from_tty;
{
  int mid;
  kern_return_t ret;
  int thread_count;
  thread_array_t thread_table;
  int index;
  mach_port_t thread_to_kill = MACH_PORT_NULL;


  MACH_ERROR_NO_INFERIOR;

  if (!args)
    error_no_arg ("thread mid to kill from the inferior task");

  mid = parse_thread_id (args, 0, 0);

  if (mid < 0)
    error ("You can kill only existing kernel threads with MID or @SLOTNUMBER");

  if (mid)
    {
      ret = machid_mach_port (mid_server, mid_auth, mid, &thread_to_kill);
      CHK ("thread_kill_command: machid_mach_port map failed", ret);
    }
  else
    mid = map_port_name_to_mid (current_thread, MACH_TYPE_THREAD);

  /* Don't allow gdb to kill *any* thread in the system. Use mkill program for that */
  ret = task_threads (inferior_task, &thread_table, &thread_count);
  CHK ("Error getting inferior's thread list", ret);

  if (thread_to_kill == current_thread)
    {
      ret = thread_terminate (thread_to_kill);
      CHK ("Thread could not be terminated", ret);

      if (select_thread (inferior_task, 0, 1) != KERN_SUCCESS)
	warning ("Last thread was killed, use \"kill\" command to kill task");
    }
  else
    for (index = 0; index < thread_count; index++)
      if (thread_table[index] == thread_to_kill)
	{
	  ret = thread_terminate (thread_to_kill);
	  CHK ("Thread could not be terminated", ret);
	}

  if (thread_count > 1)
    consume_send_rights (thread_table, thread_count);

  ret = vm_deallocate (mach_task_self (), (vm_address_t) thread_table,
		       (thread_count * sizeof (mach_port_t)));
  CHK ("Error trying to deallocate thread list", ret);

  warning ("Thread %d killed", mid);
}


/* Task specific commands; add more if you like */

void
task_resume_command (args, from_tty)
     char *args;
     int from_tty;
{
  kern_return_t ret;
  task_basic_info_data_t ta_info;
  int infoCnt = TASK_BASIC_INFO_COUNT;
  int mid = map_port_name_to_mid (inferior_task, MACH_TYPE_TASK);

  MACH_ERROR_NO_INFERIOR;

  /* Would be trivial to change, but is it desirable? */
  if (args)
    error ("Currently gdb can resume only it's inferior task");

  ret = task_info (inferior_task,
		   TASK_BASIC_INFO,
		   (task_info_t) & ta_info,
		   &infoCnt);
  CHK ("task_resume_command: task_info failed", ret);

  if (ta_info.suspend_count == 0)
    error ("Inferior task %d is not suspended", mid);
  else if (ta_info.suspend_count == 1 &&
	   from_tty &&
	!query ("Suspend count is now 1. Do you know what you are doing? "))
    error ("Task not resumed");

  ret = task_resume (inferior_task);
  CHK ("task_resume_command: task_resume", ret);

  if (ta_info.suspend_count == 1)
    {
      warning ("Inferior task %d is no longer suspended", mid);
      must_suspend_thread = 1;
      /* @@ This is not complete: Registers change all the time when not
         suspended! */
      registers_changed ();
    }
  else
    warning ("Inferior task %d suspend count is now %d",
	     mid, ta_info.suspend_count - 1);
}


void
task_suspend_command (args, from_tty)
     char *args;
     int from_tty;
{
  kern_return_t ret;
  task_basic_info_data_t ta_info;
  int infoCnt = TASK_BASIC_INFO_COUNT;
  int mid = map_port_name_to_mid (inferior_task, MACH_TYPE_TASK);

  MACH_ERROR_NO_INFERIOR;

  /* Would be trivial to change, but is it desirable? */
  if (args)
    error ("Currently gdb can suspend only it's inferior task");

  ret = task_suspend (inferior_task);
  CHK ("task_suspend_command: task_suspend", ret);

  must_suspend_thread = 0;

  ret = task_info (inferior_task,
		   TASK_BASIC_INFO,
		   (task_info_t) & ta_info,
		   &infoCnt);
  CHK ("task_suspend_command: task_info failed", ret);

  warning ("Inferior task %d suspend count is now %d",
	   mid, ta_info.suspend_count);
}

static char *
get_size (bytes)
     int bytes;
{
  static char size[30];
  int zz = bytes / 1024;

  if (zz / 1024)
    sprintf (size, "%-2.1f M", ((float) bytes) / (1024.0 * 1024.0));
  else
    sprintf (size, "%d K", zz);

  return size;
}

/* Does this require the target task to be suspended?? I don't think so. */
void
task_info_command (args, from_tty)
     char *args;
     int from_tty;
{
  int mid = -5;
  mach_port_t task;
  kern_return_t ret;
  task_basic_info_data_t ta_info;
  int infoCnt = TASK_BASIC_INFO_COUNT;
  int page_size = round_page (1);
  int thread_count = 0;

  if (MACH_PORT_VALID (inferior_task))
    mid = map_port_name_to_mid (inferior_task,
				MACH_TYPE_TASK);

  task = inferior_task;

  if (args)
    {
      int tmid = atoi (args);

      if (tmid <= 0)
	error ("Invalid mid %d for task info", tmid);

      if (tmid != mid)
	{
	  mid = tmid;
	  ret = machid_mach_port (mid_server, mid_auth, tmid, &task);
	  CHK ("task_info_command: machid_mach_port map failed", ret);
	}
    }

  if (mid < 0)
    error ("You have to give the task MID as an argument");

  ret = task_info (task,
		   TASK_BASIC_INFO,
		   (task_info_t) & ta_info,
		   &infoCnt);
  CHK ("task_info_command: task_info failed", ret);

  printf_filtered ("\nTask info for task %d:\n\n", mid);
  printf_filtered (" Suspend count : %d\n", ta_info.suspend_count);
  printf_filtered (" Base priority : %d\n", ta_info.base_priority);
  printf_filtered (" Virtual size  : %s\n", get_size (ta_info.virtual_size));
  printf_filtered (" Resident size : %s\n", get_size (ta_info.resident_size));

  {
    thread_array_t thread_list;

    ret = task_threads (task, &thread_list, &thread_count);
    CHK ("task_info_command: task_threads", ret);

    printf_filtered (" Thread count  : %d\n", thread_count);

    consume_send_rights (thread_list, thread_count);
    ret = vm_deallocate (mach_task_self (),
			 (vm_address_t) thread_list,
			 (thread_count * sizeof (int)));
    CHK ("Error trying to deallocate thread list", ret);
  }
  if (have_emulator_p (task))
    printf_filtered (" Emulator at   : 0x%x..0x%x\n",
		     EMULATOR_BASE, EMULATOR_END);
  else
    printf_filtered (" No emulator.\n");

  if (thread_count && task == inferior_task)
    printf_filtered ("\nUse the \"thread list\" command to see the threads\n");
}

/* You may either FORWARD the exception to the inferior, or KEEP
 * it and return to GDB command level.
 *
 * exception mid [ forward | keep ]
 */

static void
exception_command (args, from_tty)
     char *args;
     int from_tty;
{
  char *scan = args;
  int exception;
  int len;

  if (!args)
    error_no_arg ("exception number action");

  while (*scan == ' ' || *scan == '\t')
    scan++;

  if ('0' <= *scan && *scan <= '9')
    while ('0' <= *scan && *scan <= '9')
      scan++;
  else
    error ("exception number action");

  exception = atoi (args);
  if (exception <= 0 || exception > MAX_EXCEPTION)
    error ("Allowed exception numbers are in range 1..%d",
	   MAX_EXCEPTION);

  if (*scan != ' ' && *scan != '\t')
    error ("exception number must be followed by a space");
  else
    while (*scan == ' ' || *scan == '\t')
      scan++;

  args = scan;
  len = 0;
  while (*scan)
    {
      len++;
      scan++;
    }

  if (!len)
    error ("exception number action");

  if (!strncasecmp (args, "forward", len))
    exception_map[exception].forward = TRUE;
  else if (!strncasecmp (args, "keep", len))
    exception_map[exception].forward = FALSE;
  else
    error ("exception action is either \"keep\" or \"forward\"");
}

static void
print_exception_info (exception)
     int exception;
{
  boolean_t forward = exception_map[exception].forward;

  printf_filtered ("%s\t(%d): ", exception_map[exception].name,
		   exception);
  if (!forward)
    if (exception_map[exception].sigmap != SIG_UNKNOWN)
      printf_filtered ("keep and handle as signal %d\n",
		       exception_map[exception].sigmap);
    else
      printf_filtered ("keep and handle as unknown signal %d\n",
		       exception_map[exception].sigmap);
  else
    printf_filtered ("forward exception to inferior\n");
}

void
exception_info (args, from_tty)
     char *args;
     int from_tty;
{
  int exception;

  if (!args)
    for (exception = 1; exception <= MAX_EXCEPTION; exception++)
      print_exception_info (exception);
  else
    {
      exception = atoi (args);

      if (exception <= 0 || exception > MAX_EXCEPTION)
	error ("Invalid exception number, values from 1 to %d allowed",
	       MAX_EXCEPTION);
      print_exception_info (exception);
    }
}

/* Check for actions for mach exceptions.
 */
mach3_exception_actions (w, force_print_only, who)
     WAITTYPE *w;
     boolean_t force_print_only;
     char *who;
{
  boolean_t force_print = FALSE;


  if (force_print_only ||
      exception_map[stop_exception].sigmap == SIG_UNKNOWN)
    force_print = TRUE;
  else
    WSETSTOP (*w, exception_map[stop_exception].sigmap);

  if (exception_map[stop_exception].print || force_print)
    {
      target_terminal_ours ();

      printf_filtered ("\n%s received %s exception : ",
		       who,
		       exception_map[stop_exception].name);

      wrap_here ("   ");

      switch (stop_exception)
	{
	case EXC_BAD_ACCESS:
	  printf_filtered ("referencing address 0x%x : %s\n",
			   stop_subcode,
			   mach_error_string (stop_code));
	  break;
	case EXC_BAD_INSTRUCTION:
	  printf_filtered
	    ("illegal or undefined instruction. code %d subcode %d\n",
	     stop_code, stop_subcode);
	  break;
	case EXC_ARITHMETIC:
	  printf_filtered ("code %d\n", stop_code);
	  break;
	case EXC_EMULATION:
	  printf_filtered ("code %d subcode %d\n", stop_code, stop_subcode);
	  break;
	case EXC_SOFTWARE:
	  printf_filtered ("%s specific, code 0x%x\n",
			   stop_code < 0xffff ? "hardware" : "os emulation",
			   stop_code);
	  break;
	case EXC_BREAKPOINT:
	  printf_filtered ("type %d (machine dependent)\n",
			   stop_code);
	  break;
	default:
	  internal_error ("Unknown exception");
	}
    }
}

setup_notify_port (create_new)
     int create_new;
{
  kern_return_t ret;

  if (MACH_PORT_VALID (our_notify_port))
    {
      ret = mach_port_destroy (mach_task_self (), our_notify_port);
      CHK ("Could not destroy our_notify_port", ret);
    }

  our_notify_port = MACH_PORT_NULL;
  notify_chain = (port_chain_t) NULL;
  port_chain_destroy (port_chain_obstack);

  if (create_new)
    {
      ret = mach_port_allocate (mach_task_self (),
				MACH_PORT_RIGHT_RECEIVE,
				&our_notify_port);
      if (ret != KERN_SUCCESS)
	internal_error ("Creating notify port %s", mach_error_string (ret));

      ret = mach_port_move_member (mach_task_self (),
				   our_notify_port,
				   inferior_wait_port_set);
      if (ret != KERN_SUCCESS)
	internal_error ("initial move member %s", mach_error_string (ret));
    }
}

/*
 * Register our message port to the net name server
 *
 * Currently used only by the external stop-gdb program
 * since ^C does not work if you would like to enter
 * gdb command level while debugging your program.
 *
 * NOTE: If the message port is sometimes used for other
 * purposes also, the NAME must not be a guessable one.
 * Then, there should be a way to change it.
 */

char registered_name[MAX_NAME_LEN];

void
message_port_info (args, from_tty)
     char *args;
     int from_tty;
{
  if (registered_name[0])
    printf_filtered ("gdb's message port name: '%s'\n",
		     registered_name);
  else
    printf_filtered ("gdb's message port is not currently registered\n");
}

void
gdb_register_port (name, port)
     char *name;
     mach_port_t port;
{
  kern_return_t ret;
  static int already_signed = 0;
  int len;

  if (!MACH_PORT_VALID (port) || !name || !*name)
    {
      warning ("Invalid registration request");
      return;
    }

  if (!already_signed)
    {
      ret = mach_port_insert_right (mach_task_self (),
				    our_message_port,
				    our_message_port,
				    MACH_MSG_TYPE_MAKE_SEND);
      CHK ("Failed to create a signature to our_message_port", ret);
      already_signed = 1;
    }
  else if (already_signed > 1)
    {
      ret = netname_check_out (name_server_port,
			       registered_name,
			       our_message_port);
      CHK ("Failed to check out gdb's message port", ret);
      registered_name[0] = '\000';
      already_signed = 1;
    }

  ret = netname_check_in (name_server_port,	/* Name server port */
			  name,	/* Name of service */
			  our_message_port,	/* Signature */
			  port);	/* Creates a new send right */
  CHK ("Failed to check in the port", ret);

  len = 0;
  while (len < MAX_NAME_LEN && *(name + len))
    {
      registered_name[len] = *(name + len);
      len++;
    }
  registered_name[len] = '\000';
  already_signed = 2;
}

struct cmd_list_element *cmd_thread_list;
struct cmd_list_element *cmd_task_list;

/*ARGSUSED */
static void
thread_command (arg, from_tty)
     char *arg;
     int from_tty;
{
  printf_unfiltered ("\"thread\" must be followed by the name of a thread command.\n");
  help_list (cmd_thread_list, "thread ", -1, gdb_stdout);
}

/*ARGSUSED */
static void
task_command (arg, from_tty)
     char *arg;
     int from_tty;
{
  printf_unfiltered ("\"task\" must be followed by the name of a task command.\n");
  help_list (cmd_task_list, "task ", -1, gdb_stdout);
}

add_mach_specific_commands ()
{
  /* Thread handling commands */

  /* FIXME: Move our thread support into the generic thread.c stuff so we
     can share that code.  */
  add_prefix_cmd ("mthread", class_stack, thread_command,
	  "Generic command for handling Mach threads in the debugged task.",
		  &cmd_thread_list, "thread ", 0, &cmdlist);

  add_com_alias ("th", "mthread", class_stack, 1);

  add_cmd ("select", class_stack, thread_select_command,
	   "Select and print MID of the selected thread",
	   &cmd_thread_list);
  add_cmd ("list", class_stack, thread_list_command,
	   "List info of task's threads. Selected thread is marked with '*'",
	   &cmd_thread_list);
  add_cmd ("suspend", class_run, thread_suspend_command,
	   "Suspend one or all of the threads in the selected task.",
	   &cmd_thread_list);
  add_cmd ("resume", class_run, thread_resume_command,
	   "Resume one or all of the threads in the selected task.",
	   &cmd_thread_list);
  add_cmd ("kill", class_run, thread_kill_command,
	   "Kill the specified thread MID from inferior task.",
	   &cmd_thread_list);
#if 0
  /* The rest of this support (condition_thread) was not merged.  It probably
     should not be merged in this form, but instead added to the generic GDB
     thread support.  */
  add_cmd ("break", class_breakpoint, condition_thread,
	   "Breakpoint N will only be effective for thread MID or @SLOT\n\
	    If MID/@SLOT is omitted allow all threads to break at breakpoint",
	   &cmd_thread_list);
#endif
  /* Thread command shorthands (for backward compatibility) */
  add_alias_cmd ("ts", "mthread select", 0, 0, &cmdlist);
  add_alias_cmd ("tl", "mthread list", 0, 0, &cmdlist);

  /* task handling commands */

  add_prefix_cmd ("task", class_stack, task_command,
		  "Generic command for handling debugged task.",
		  &cmd_task_list, "task ", 0, &cmdlist);

  add_com_alias ("ta", "task", class_stack, 1);

  add_cmd ("suspend", class_run, task_suspend_command,
	   "Suspend the inferior task.",
	   &cmd_task_list);
  add_cmd ("resume", class_run, task_resume_command,
	   "Resume the inferior task.",
	   &cmd_task_list);
  add_cmd ("info", no_class, task_info_command,
	   "Print information about the specified task.",
	   &cmd_task_list);

  /* Print my message port name */

  add_info ("message-port", message_port_info,
	    "Returns the name of gdb's message port in the netnameserver");

  /* Exception commands */

  add_info ("exceptions", exception_info,
	    "What debugger does when program gets various exceptions.\n\
Specify an exception number as argument to print info on that\n\
exception only.");

  add_com ("exception", class_run, exception_command,
	   "Specify how to handle an exception.\n\
Args are exception number followed by \"forward\" or \"keep\".\n\
`Forward' means forward the exception to the program's normal exception\n\
handler.\n\
`Keep' means reenter debugger if this exception happens, and GDB maps\n\
the exception to some signal (see info exception)\n\
Normally \"keep\" is used to return to GDB on exception.");
}

kern_return_t
do_mach_notify_dead_name (notify, name)
     mach_port_t notify;
     mach_port_t name;
{
  kern_return_t kr = KERN_SUCCESS;

  /* Find the thing that notified */
  port_chain_t element = port_chain_member (notify_chain, name);

  /* Take name of from unreceived dead name notification list */
  notify_chain = port_chain_delete (notify_chain, name);

  if (!element)
    error ("Received a dead name notify from unchained port (0x%x)", name);

  switch (element->type)
    {

    case MACH_TYPE_THREAD:
      target_terminal_ours_for_output ();
      if (name == current_thread)
	{
	  printf_filtered ("\nCurrent thread %d died", element->mid);
	  current_thread = MACH_PORT_NULL;
	}
      else
	printf_filtered ("\nThread %d died", element->mid);

      break;

    case MACH_TYPE_TASK:
      target_terminal_ours_for_output ();
      if (name != inferior_task)
	printf_filtered ("Task %d died, but it was not the selected task",
			 element->mid);
      else
	{
	  printf_filtered ("Current task %d died", element->mid);

	  mach_port_destroy (mach_task_self (), name);
	  inferior_task = MACH_PORT_NULL;

	  if (notify_chain)
	    warning ("There were still unreceived dead_name_notifications???");

	  /* Destroy the old notifications */
	  setup_notify_port (0);

	}
      break;

    default:
      error ("Unregistered dead_name 0x%x notification received. Type is %d, mid is 0x%x",
	     name, element->type, element->mid);
      break;
    }

  return KERN_SUCCESS;
}

kern_return_t
do_mach_notify_msg_accepted (notify, name)
     mach_port_t notify;
     mach_port_t name;
{
  warning ("do_mach_notify_msg_accepted : notify %x, name %x",
	   notify, name);
  return KERN_SUCCESS;
}

kern_return_t
do_mach_notify_no_senders (notify, mscount)
     mach_port_t notify;
     mach_port_mscount_t mscount;
{
  warning ("do_mach_notify_no_senders : notify %x, mscount %x",
	   notify, mscount);
  return KERN_SUCCESS;
}

kern_return_t
do_mach_notify_port_deleted (notify, name)
     mach_port_t notify;
     mach_port_t name;
{
  warning ("do_mach_notify_port_deleted : notify %x, name %x",
	   notify, name);
  return KERN_SUCCESS;
}

kern_return_t
do_mach_notify_port_destroyed (notify, rights)
     mach_port_t notify;
     mach_port_t rights;
{
  warning ("do_mach_notify_port_destroyed : notify %x, rights %x",
	   notify, rights);
  return KERN_SUCCESS;
}

kern_return_t
do_mach_notify_send_once (notify)
     mach_port_t notify;
{
#ifdef DUMP_SYSCALL
  /* MANY of these are generated. */
  warning ("do_mach_notify_send_once : notify %x",
	   notify);
#endif
  return KERN_SUCCESS;
}

/* Kills the inferior. It's gone when you call this */
static void
kill_inferior_fast ()
{
  WAITTYPE w;

  if (inferior_pid == 0 || inferior_pid == 1)
    return;

  /* kill() it, since the Unix server does not otherwise notice when
   * killed with task_terminate().
   */
  if (inferior_pid > 0)
    kill (inferior_pid, SIGKILL);

  /* It's propably terminate already */
  (void) task_terminate (inferior_task);

  inferior_task = MACH_PORT_NULL;
  current_thread = MACH_PORT_NULL;

  wait3 (&w, WNOHANG, 0);

  setup_notify_port (0);
}

static void
m3_kill_inferior ()
{
  kill_inferior_fast ();
  target_mourn_inferior ();
}

/* Clean up after the inferior dies.  */

static void
m3_mourn_inferior ()
{
  unpush_target (&m3_ops);
  generic_mourn_inferior ();
}


/* Fork an inferior process, and start debugging it.  */

static void
m3_create_inferior (exec_file, allargs, env)
     char *exec_file;
     char *allargs;
     char **env;
{
  fork_inferior (exec_file, allargs, env, m3_trace_me, m3_trace_him, NULL, NULL);
  /* We are at the first instruction we care about.  */
  /* Pedal to the metal... */
  proceed ((CORE_ADDR) -1, 0, 0);
}

/* Mark our target-struct as eligible for stray "run" and "attach"
   commands.  */
static int
m3_can_run ()
{
  return 1;
}

/* Mach 3.0 does not need ptrace for anything
 * Make sure nobody uses it on mach.
 */
ptrace (a, b, c, d)
     int a, b, c, d;
{
  error ("Lose, Lose! Somebody called ptrace\n");
}

/* Resume execution of the inferior process.
   If STEP is nonzero, single-step it.
   If SIGNAL is nonzero, give it that signal.  */

void
m3_resume (pid, step, signal)
     int pid;
     int step;
     enum target_signal signal;
{
  kern_return_t ret;

  if (step)
    {
      thread_basic_info_data_t th_info;
      unsigned int infoCnt = THREAD_BASIC_INFO_COUNT;

      /* There is no point in single stepping when current_thread
       * is dead.
       */
      if (!MACH_PORT_VALID (current_thread))
	error ("No thread selected; can not single step");

      /* If current_thread is suspended, tracing it would never return.
       */
      ret = thread_info (current_thread,
			 THREAD_BASIC_INFO,
			 (thread_info_t) & th_info,
			 &infoCnt);
      CHK ("child_resume: can't get thread info", ret);

      if (th_info.suspend_count)
	error ("Can't trace a suspended thread. Use \"thread resume\" command to resume it");
    }

  vm_read_cache_valid = FALSE;

  if (signal && inferior_pid > 0)	/* Do not signal, if attached by MID */
    kill (inferior_pid, target_signal_to_host (signal));

  if (step)
    {
      suspend_all_threads (0);

      setup_single_step (current_thread, TRUE);

      ret = thread_resume (current_thread);
      CHK ("thread_resume", ret);
    }

  ret = task_resume (inferior_task);
  if (ret == KERN_FAILURE)
    warning ("Task was not suspended");
  else
    CHK ("Resuming task", ret);

  /* HACK HACK This is needed by the multiserver system HACK HACK */
  while ((ret = task_resume (inferior_task)) == KERN_SUCCESS)
    /* make sure it really runs */ ;
  /* HACK HACK This is needed by the multiserver system HACK HACK */
}

#ifdef ATTACH_DETACH

/* Start debugging the process with the given task */
void
task_attach (tid)
     task_t tid;
{
  kern_return_t ret;
  inferior_task = tid;

  ret = task_suspend (inferior_task);
  CHK ("task_attach: task_suspend", ret);

  must_suspend_thread = 0;

  setup_notify_port (1);

  request_notify (inferior_task, MACH_NOTIFY_DEAD_NAME, MACH_TYPE_TASK);

  setup_exception_port ();

  emulator_present = have_emulator_p (inferior_task);

  attach_flag = 1;
}

/* Well, we can call error also here and leave the
 * target stack inconsistent. Sigh.
 * Fix this sometime (the only way to fail here is that
 * the task has no threads at all, which is rare, but
 * possible; or if the target task has died, which is also
 * possible, but unlikely, since it has been suspended.
 * (Someone must have killed it))
 */
void
attach_to_thread ()
{
  if (select_thread (inferior_task, 0, 1) != KERN_SUCCESS)
    error ("Could not select any threads to attach to");
}

mid_attach (mid)
     int mid;
{
  kern_return_t ret;

  ret = machid_mach_port (mid_server, mid_auth, mid, &inferior_task);
  CHK ("mid_attach: machid_mach_port", ret);

  task_attach (inferior_task);

  return mid;
}

/* 
 * Start debugging the process whose unix process-id is PID.
 * A negative "pid" value is legal and signifies a mach_id not a unix pid.
 *
 * Prevent (possible unwanted) dangerous operations by enabled users
 * like "atta 0" or "atta foo" (equal to the previous :-) and
 * "atta pidself". Anyway, the latter is allowed by specifying a MID.
 */
static int
m3_do_attach (pid)
     int pid;
{
  kern_return_t ret;

  if (pid == 0)
    error ("MID=0, Debugging the master unix server does not compute");

  /* Foo. This assumes gdb has a unix pid */
  if (pid == getpid ())
    error ("I will debug myself only by mid. (Gdb would suspend itself!)");

  if (pid < 0)
    {
      mid_attach (-(pid));

      /* inferior_pid will be NEGATIVE! */
      inferior_pid = pid;

      return inferior_pid;
    }

  inferior_task = task_by_pid (pid);
  if (!MACH_PORT_VALID (inferior_task))
    error ("Cannot map Unix pid %d to Mach task port", pid);

  task_attach (inferior_task);

  inferior_pid = pid;

  return inferior_pid;
}

/* Attach to process PID, then initialize for debugging it
   and wait for the trace-trap that results from attaching.  */

static void
m3_attach (args, from_tty)
     char *args;
     int from_tty;
{
  char *exec_file;
  int pid;

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

  pid = atoi (args);

  if (pid == getpid ())		/* Trying to masturbate? */
    error ("I refuse to debug myself!");

  if (from_tty)
    {
      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));
      else
	printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));

      gdb_flush (gdb_stdout);
    }

  m3_do_attach (pid);
  inferior_pid = pid;
  push_target (&m3_ops);
}

void
deallocate_inferior_ports ()
{
  kern_return_t ret;
  thread_array_t thread_list;
  int thread_count, index;

  if (!MACH_PORT_VALID (inferior_task))
    return;

  ret = task_threads (inferior_task, &thread_list, &thread_count);
  if (ret != KERN_SUCCESS)
    {
      warning ("deallocate_inferior_ports: task_threads",
	       mach_error_string (ret));
      return;
    }

  /* Get rid of send rights to task threads */
  for (index = 0; index < thread_count; index++)
    {
      int rights;
      ret = mach_port_get_refs (mach_task_self (),
				thread_list[index],
				MACH_PORT_RIGHT_SEND,
				&rights);
      CHK ("deallocate_inferior_ports: get refs", ret);

      if (rights > 0)
	{
	  ret = mach_port_mod_refs (mach_task_self (),
				    thread_list[index],
				    MACH_PORT_RIGHT_SEND,
				    -rights);
	  CHK ("deallocate_inferior_ports: mod refs", ret);
	}
    }

  ret = mach_port_mod_refs (mach_task_self (),
			    inferior_exception_port,
			    MACH_PORT_RIGHT_RECEIVE,
			    -1);
  CHK ("deallocate_inferior_ports: cannot get rid of exception port", ret);

  ret = mach_port_deallocate (mach_task_self (),
			      inferior_task);
  CHK ("deallocate_task_port: deallocating inferior_task", ret);

  current_thread = MACH_PORT_NULL;
  inferior_task = MACH_PORT_NULL;
}

/* Stop debugging the process whose number is PID
   and continue it with signal number SIGNAL.
   SIGNAL = 0 means just continue it.  */

static void
m3_do_detach (signal)
     int signal;
{
  kern_return_t ret;

  MACH_ERROR_NO_INFERIOR;

  if (current_thread != MACH_PORT_NULL)
    {
      /* Store the gdb's view of the thread we are deselecting
       * before we detach.
       * @@ I am really not sure if this is ever needeed.
       */
      target_prepare_to_store ();
      target_store_registers (-1);
    }

  ret = task_set_special_port (inferior_task,
			       TASK_EXCEPTION_PORT,
			       inferior_old_exception_port);
  CHK ("task_set_special_port", ret);

  /* Discard all requested notifications */
  setup_notify_port (0);

  if (remove_breakpoints ())
    warning ("Could not remove breakpoints when detaching");

  if (signal && inferior_pid > 0)
    kill (inferior_pid, signal);

  /* the task might be dead by now */
  (void) task_resume (inferior_task);

  deallocate_inferior_ports ();

  attach_flag = 0;
}

/* Take a program previously attached to and detaches it.
   The program resumes execution and will no longer stop
   on signals, etc.  We'd better not have left any breakpoints
   in the program or it'll die when it hits one.  For this
   to work, it may be necessary for the process to have been
   previously attached.  It *might* work if the program was
   started via fork.  */

static void
m3_detach (args, from_tty)
     char *args;
     int from_tty;
{
  int siggnal = 0;

  if (from_tty)
    {
      char *exec_file = get_exec_file (0);
      if (exec_file == 0)
	exec_file = "";
      printf_unfiltered ("Detaching from program: %s %s\n",
			 exec_file, target_pid_to_str (inferior_pid));
      gdb_flush (gdb_stdout);
    }
  if (args)
    siggnal = atoi (args);

  m3_do_detach (siggnal);
  inferior_pid = 0;
  unpush_target (&m3_ops);	/* Pop out of handling an inferior */
}
#endif /* ATTACH_DETACH */

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

static void
m3_prepare_to_store ()
{
#ifdef CHILD_PREPARE_TO_STORE
  CHILD_PREPARE_TO_STORE ();
#endif
}

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

static void
m3_files_info (ignore)
     struct target_ops *ignore;
{
  /* FIXME: should print MID and all that crap.  */
  printf_unfiltered ("\tUsing the running image of %s %s.\n",
      attach_flag ? "attached" : "child", target_pid_to_str (inferior_pid));
}

static void
m3_open (arg, from_tty)
     char *arg;
     int from_tty;
{
  error ("Use the \"run\" command to start a Unix child process.");
}

#ifdef DUMP_SYSCALL
#ifdef __STDC__
#define STR(x) #x
#else
#define STR(x) "x"
#endif

char *bsd1_names[] =
{
  "execve",
  "fork",
  "take_signal",
  "sigreturn",
  "getrusage",
  "chdir",
  "chroot",
  "open",
  "creat",
  "mknod",
  "link",
  "symlink",
  "unlink",
  "access",
  "stat",
  "readlink",
  "chmod",
  "chown",
  "utimes",
  "truncate",
  "rename",
  "mkdir",
  "rmdir",
  "xutimes",
  "mount",
  "umount",
  "acct",
  "setquota",
  "write_short",
  "write_long",
  "send_short",
  "send_long",
  "sendto_short",
  "sendto_long",
  "select",
  "task_by_pid",
  "recvfrom_short",
  "recvfrom_long",
  "setgroups",
  "setrlimit",
  "sigvec",
  "sigstack",
  "settimeofday",
  "adjtime",
  "setitimer",
  "sethostname",
  "bind",
  "accept",
  "connect",
  "setsockopt",
  "getsockopt",
  "getsockname",
  "getpeername",
  "init_process",
  "table_set",
  "table_get",
  "pioctl",
  "emulator_error",
  "readwrite",
  "share_wakeup",
  0,
  "maprw_request_it",
  "maprw_release_it",
  "maprw_remap",
  "pid_by_task",
};

int bsd1_nnames = sizeof (bsd1_names) / sizeof (bsd1_names[0]);

char *
name_str (name, buf)

     int name;
     char *buf;

{
  switch (name)
    {
    case MACH_MSG_TYPE_BOOLEAN:
      return "boolean";
    case MACH_MSG_TYPE_INTEGER_16:
      return "short";
    case MACH_MSG_TYPE_INTEGER_32:
      return "long";
    case MACH_MSG_TYPE_CHAR:
      return "char";
    case MACH_MSG_TYPE_BYTE:
      return "byte";
    case MACH_MSG_TYPE_REAL:
      return "real";
    case MACH_MSG_TYPE_STRING:
      return "string";
    default:
      sprintf (buf, "%d", name);
      return buf;
    }
}

char *
id_str (id, buf)

     int id;
     char *buf;

{
  char *p;
  if (id >= 101000 && id < 101000 + bsd1_nnames)
    {
      if (p = bsd1_names[id - 101000])
	return p;
    }
  if (id == 102000)
    return "psignal_retry";
  if (id == 100000)
    return "syscall";
  sprintf (buf, "%d", id);
  return buf;
}

print_msg (mp)
     mach_msg_header_t *mp;
{
  char *fmt_x = "%20s : 0x%08x\n";
  char *fmt_d = "%20s : %10d\n";
  char *fmt_s = "%20s : %s\n";
  char buf[100];

  puts_filtered ("\n");
#define pr(fmt,h,x) printf_filtered(fmt,STR(x),(h).x)
  pr (fmt_x, (*mp), msgh_bits);
  pr (fmt_d, (*mp), msgh_size);
  pr (fmt_x, (*mp), msgh_remote_port);
  pr (fmt_x, (*mp), msgh_local_port);
  pr (fmt_d, (*mp), msgh_kind);
  printf_filtered (fmt_s, STR (msgh_id), id_str (mp->msgh_id, buf));

  if (debug_level > 1)
    {
      char *p, *ep, *dp;
      int plen;
      p = (char *) mp;
      ep = p + mp->msgh_size;
      p += sizeof (*mp);
      for (; p < ep; p += plen)
	{
	  mach_msg_type_t *tp;
	  mach_msg_type_long_t *tlp;
	  int name, size, number;
	  tp = (mach_msg_type_t *) p;
	  if (tp->msgt_longform)
	    {
	      tlp = (mach_msg_type_long_t *) tp;
	      name = tlp->msgtl_name;
	      size = tlp->msgtl_size;
	      number = tlp->msgtl_number;
	      plen = sizeof (*tlp);
	    }
	  else
	    {
	      name = tp->msgt_name;
	      size = tp->msgt_size;
	      number = tp->msgt_number;
	      plen = sizeof (*tp);
	    }
	  printf_filtered ("name=%-16s size=%2d number=%7d inline=%d long=%d deal=%d\n",
			name_str (name, buf), size, number, tp->msgt_inline,
			   tp->msgt_longform, tp->msgt_deallocate);
	  dp = p + plen;
	  if (tp->msgt_inline)
	    {
	      int l;
	      l = size * number / 8;
	      l = (l + sizeof (long) - 1) & ~((sizeof (long)) - 1);
	      plen += l;
	      print_data (dp, size, number);
	    }
	  else
	    {
	      plen += sizeof (int *);
	    }
	  printf_filtered ("plen=%d\n", plen);
	}
    }
}

print_data (p, size, number)

     char *p;

{
  int *ip;
  short *sp;
  int i;

  switch (size)
    {
    case 8:
      for (i = 0; i < number; i++)
	{
	  printf_filtered (" %02x", p[i]);
	}
      break;
    case 16:
      sp = (short *) p;
      for (i = 0; i < number; i++)
	{
	  printf_filtered (" %04x", sp[i]);
	}
      break;
    case 32:
      ip = (int *) p;
      for (i = 0; i < number; i++)
	{
	  printf_filtered (" %08x", ip[i]);
	}
      break;
    }
  puts_filtered ("\n");
}
#endif /* DUMP_SYSCALL */

static void
m3_stop ()
{
  error ("to_stop target function not implemented");
}

static char *
m3_pid_to_exec_file (pid)
     int pid;
{
  error ("to_pid_to_exec_file target function not implemented");
  return NULL;			/* To keep all compilers happy. */
}

static void
init_m3_ops ()
{
  m3_ops.to_shortname = "mach";
  m3_ops.to_longname = "Mach child process";
  m3_ops.to_doc = "Mach child process (started by the \"run\" command).";
  m3_ops.to_open = m3_open;
  m3_ops.to_attach = m3_attach;
  m3_ops.to_detach = m3_detach;
  m3_ops.to_resume = m3_resume;
  m3_ops.to_wait = mach_really__wait;
  m3_ops.to_fetch_registers = fetch_inferior_registers;
  m3_ops.to_store_registers = store_inferior_registers;
  m3_ops.to_prepare_to_store = m3_prepare_to_store;
  m3_ops.to_xfer_memory = m3_xfer_memory;
  m3_ops.to_files_info = m3_files_info;
  m3_ops.to_insert_breakpoint = memory_insert_breakpoint;
  m3_ops.to_remove_breakpoint = memory_remove_breakpoint;
  m3_ops.to_terminal_init = terminal_init_inferior;
  m3_ops.to_terminal_inferior = terminal_inferior;
  m3_ops.to_terminal_ours_for_output = terminal_ours_for_output;
  m3_ops.to_terminal_ours = terminal_ours;
  m3_ops.to_terminal_info = child_terminal_info;
  m3_ops.to_kill = m3_kill_inferior;
  m3_ops.to_create_inferior = m3_create_inferior;
  m3_ops.to_mourn_inferior = m3_mourn_inferior;
  m3_ops.to_can_run = m3_can_run;
  m3_ops.to_stop = m3_stop;
  m3_ops.to_pid_to_exec_file = m3_pid_to_exec_file;
  m3_ops.to_stratum = process_stratum;
  m3_ops.to_has_all_memory = 1;
  m3_ops.to_has_memory = 1;
  m3_ops.to_has_stack = 1;
  m3_ops.to_has_registers = 1;
  m3_ops.to_has_execution = 1;
  m3_ops.to_magic = OPS_MAGIC;
}

void
_initialize_m3_nat ()
{
  kern_return_t ret;

  init_m3_ops ();
  add_target (&m3_ops);

  ret = mach_port_allocate (mach_task_self (),
			    MACH_PORT_RIGHT_PORT_SET,
			    &inferior_wait_port_set);
  if (ret != KERN_SUCCESS)
    internal_error ("initial port set %s", mach_error_string (ret));

  /* mach_really_wait now waits for this */
  currently_waiting_for = inferior_wait_port_set;

  ret = netname_look_up (name_server_port, hostname, "MachID", &mid_server);
  if (ret != KERN_SUCCESS)
    {
      mid_server = MACH_PORT_NULL;

      warning ("initialize machid: netname_lookup_up(MachID) : %s",
	       mach_error_string (ret));
      warning ("Some (most?) features disabled...");
    }

  mid_auth = mach_privileged_host_port ();
  if (mid_auth == MACH_PORT_NULL)
    mid_auth = mach_task_self ();

  obstack_init (port_chain_obstack);

  ret = mach_port_allocate (mach_task_self (),
			    MACH_PORT_RIGHT_RECEIVE,
			    &thread_exception_port);
  CHK ("Creating thread_exception_port for single stepping", ret);

  ret = mach_port_insert_right (mach_task_self (),
				thread_exception_port,
				thread_exception_port,
				MACH_MSG_TYPE_MAKE_SEND);
  CHK ("Inserting send right to thread_exception_port", ret);

  /* Allocate message port */
  ret = mach_port_allocate (mach_task_self (),
			    MACH_PORT_RIGHT_RECEIVE,
			    &our_message_port);
  if (ret != KERN_SUCCESS)
    warning ("Creating message port %s", mach_error_string (ret));
  else
    {
      char buf[MAX_NAME_LEN];
      ret = mach_port_move_member (mach_task_self (),
				   our_message_port,
				   inferior_wait_port_set);
      if (ret != KERN_SUCCESS)
	warning ("message move member %s", mach_error_string (ret));


      /* @@@@ No way to change message port name currently */
      /* Foo. This assumes gdb has a unix pid */
      sprintf (buf, "gdb-%d", getpid ());
      gdb_register_port (buf, our_message_port);
    }

  /* Heap for thread commands */
  obstack_init (cproc_obstack);

  add_mach_specific_commands ();
}